1	// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
2	/*
3	* Copyright (c) 2004-2007 Intel Corporation. All rights reserved.
4	* Copyright (c) 2004 Topspin Corporation. All rights reserved.
5	* Copyright (c) 2004, 2005 Voltaire Corporation. All rights reserved.
6	* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
7	* Copyright (c) 2019, Mellanox Technologies inc. All rights reserved.
8	*/
9
10	#include <linux/completion.h>
11	#include <linux/dma-mapping.h>
12	#include <linux/device.h>
13	#include <linux/module.h>
14	#include <linux/err.h>
15	#include <linux/idr.h>
16	#include <linux/interrupt.h>
17	#include <linux/random.h>
18	#include <linux/rbtree.h>
19	#include <linux/spinlock.h>
20	#include <linux/slab.h>
21	#include <linux/sysfs.h>
22	#include <linux/workqueue.h>
23	#include <linux/kdev_t.h>
24	#include <linux/etherdevice.h>
25
26	#include <rdma/ib_cache.h>
27	#include <rdma/ib_cm.h>
28	#include <rdma/ib_sysfs.h>
29	#include "cm_msgs.h"
30	#include "core_priv.h"
31	#include "cm_trace.h"
32
33	MODULE_AUTHOR("Sean Hefty");
34	MODULE_DESCRIPTION("InfiniBand CM");
35	MODULE_LICENSE("Dual BSD/GPL");
36
37	#define CM_DIRECT_RETRY_CTX ((void *) 1UL)
38	#define CM_MRA_SETTING 24 /* 4.096us * 2^24 = ~68.7 seconds */
39
40	static const char * const ibcm_rej_reason_strs[] = {
41	[IB_CM_REJ_NO_QP] = "no QP",
42	[IB_CM_REJ_NO_EEC] = "no EEC",
43	[IB_CM_REJ_NO_RESOURCES] = "no resources",
44	[IB_CM_REJ_TIMEOUT] = "timeout",
45	[IB_CM_REJ_UNSUPPORTED] = "unsupported",
46	[IB_CM_REJ_INVALID_COMM_ID] = "invalid comm ID",
47	[IB_CM_REJ_INVALID_COMM_INSTANCE] = "invalid comm instance",
48	[IB_CM_REJ_INVALID_SERVICE_ID] = "invalid service ID",
49	[IB_CM_REJ_INVALID_TRANSPORT_TYPE] = "invalid transport type",
50	[IB_CM_REJ_STALE_CONN] = "stale conn",
51	[IB_CM_REJ_RDC_NOT_EXIST] = "RDC not exist",
52	[IB_CM_REJ_INVALID_GID] = "invalid GID",
53	[IB_CM_REJ_INVALID_LID] = "invalid LID",
54	[IB_CM_REJ_INVALID_SL] = "invalid SL",
55	[IB_CM_REJ_INVALID_TRAFFIC_CLASS] = "invalid traffic class",
56	[IB_CM_REJ_INVALID_HOP_LIMIT] = "invalid hop limit",
57	[IB_CM_REJ_INVALID_PACKET_RATE] = "invalid packet rate",
58	[IB_CM_REJ_INVALID_ALT_GID] = "invalid alt GID",
59	[IB_CM_REJ_INVALID_ALT_LID] = "invalid alt LID",
60	[IB_CM_REJ_INVALID_ALT_SL] = "invalid alt SL",
61	[IB_CM_REJ_INVALID_ALT_TRAFFIC_CLASS] = "invalid alt traffic class",
62	[IB_CM_REJ_INVALID_ALT_HOP_LIMIT] = "invalid alt hop limit",
63	[IB_CM_REJ_INVALID_ALT_PACKET_RATE] = "invalid alt packet rate",
64	[IB_CM_REJ_PORT_CM_REDIRECT] = "port CM redirect",
65	[IB_CM_REJ_PORT_REDIRECT] = "port redirect",
66	[IB_CM_REJ_INVALID_MTU] = "invalid MTU",
67	[IB_CM_REJ_INSUFFICIENT_RESP_RESOURCES] = "insufficient resp resources",
68	[IB_CM_REJ_CONSUMER_DEFINED] = "consumer defined",
69	[IB_CM_REJ_INVALID_RNR_RETRY] = "invalid RNR retry",
70	[IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID] = "duplicate local comm ID",
71	[IB_CM_REJ_INVALID_CLASS_VERSION] = "invalid class version",
72	[IB_CM_REJ_INVALID_FLOW_LABEL] = "invalid flow label",
73	[IB_CM_REJ_INVALID_ALT_FLOW_LABEL] = "invalid alt flow label",
74	[IB_CM_REJ_VENDOR_OPTION_NOT_SUPPORTED] =
75	"vendor option is not supported",
76	};
77
78	const char *__attribute_const__ ibcm_reject_msg(int reason)
79	{
80	size_t index = reason;
81
82	if (index < ARRAY_SIZE(ibcm_rej_reason_strs) &&
83	ibcm_rej_reason_strs[index])
84	return ibcm_rej_reason_strs[index];
85	else
86	return "unrecognized reason";
87	}
88	EXPORT_SYMBOL(ibcm_reject_msg);
89
90	struct cm_id_private;
91	struct cm_work;
92	static int cm_add_one(struct ib_device *device);
93	static void cm_remove_one(struct ib_device *device, void *client_data);
94	static void cm_process_work(struct cm_id_private *cm_id_priv,
95	struct cm_work *work);
96	static int cm_send_sidr_rep_locked(struct cm_id_private *cm_id_priv,
97	struct ib_cm_sidr_rep_param *param);
98	static void cm_issue_dreq(struct cm_id_private *cm_id_priv);
99	static int cm_send_drep_locked(struct cm_id_private *cm_id_priv,
100	void *private_data, u8 private_data_len);
101	static int cm_send_rej_locked(struct cm_id_private *cm_id_priv,
102	enum ib_cm_rej_reason reason, void *ari,
103	u8 ari_length, const void *private_data,
104	u8 private_data_len);
105
106	static struct ib_client cm_client = {
107	.name = "cm",
108	.add = cm_add_one,
109	.remove = cm_remove_one
110	};
111
112	static struct ib_cm {
113	spinlock_t lock;
114	struct list_head device_list;
115	rwlock_t device_lock;
116	struct rb_root listen_service_table;
117	u64 listen_service_id;
118	/* struct rb_root peer_service_table; todo: fix peer to peer */
119	struct rb_root remote_qp_table;
120	struct rb_root remote_id_table;
121	struct rb_root remote_sidr_table;
122	struct xarray local_id_table;
123	u32 local_id_next;
124	__be32 random_id_operand;
125	struct list_head timewait_list;
126	struct workqueue_struct *wq;
127	} cm;
128
129	/* Counter indexes ordered by attribute ID */
130	enum {
131	CM_REQ_COUNTER,
132	CM_MRA_COUNTER,
133	CM_REJ_COUNTER,
134	CM_REP_COUNTER,
135	CM_RTU_COUNTER,
136	CM_DREQ_COUNTER,
137	CM_DREP_COUNTER,
138	CM_SIDR_REQ_COUNTER,
139	CM_SIDR_REP_COUNTER,
140	CM_LAP_COUNTER,
141	CM_APR_COUNTER,
142	CM_ATTR_COUNT,
143	CM_ATTR_ID_OFFSET = 0x0010,
144	};
145
146	enum {
147	CM_XMIT,
148	CM_XMIT_RETRIES,
149	CM_RECV,
150	CM_RECV_DUPLICATES,
151	CM_COUNTER_GROUPS
152	};
153
154	struct cm_counter_attribute {
155	struct ib_port_attribute attr;
156	unsigned short group;
157	unsigned short index;
158	};
159
160	struct cm_port {
161	struct cm_device *cm_dev;
162	struct ib_mad_agent *mad_agent;
163	struct ib_mad_agent *rep_agent;
164	u32 port_num;
165	atomic_long_t counters[CM_COUNTER_GROUPS][CM_ATTR_COUNT];
166	};
167
168	struct cm_device {
169	struct kref kref;
170	struct list_head list;
171	rwlock_t mad_agent_lock;
172	struct ib_device *ib_device;
173	u8 ack_delay;
174	int going_down;
175	struct cm_port *port[];
176	};
177
178	struct cm_av {
179	struct cm_port *port;
180	struct rdma_ah_attr ah_attr;
181	u16 dlid_datapath;
182	u16 pkey_index;
183	u8 timeout;
184	};
185
186	struct cm_work {
187	struct delayed_work work;
188	struct list_head list;
189	struct cm_port *port;
190	struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */
191	__be32 local_id; /* Established / timewait */
192	__be32 remote_id;
193	struct ib_cm_event cm_event;
194	struct sa_path_rec path[];
195	};
196
197	struct cm_timewait_info {
198	struct cm_work work;
199	struct list_head list;
200	struct rb_node remote_qp_node;
201	struct rb_node remote_id_node;
202	__be64 remote_ca_guid;
203	__be32 remote_qpn;
204	u8 inserted_remote_qp;
205	u8 inserted_remote_id;
206	};
207
208	struct cm_id_private {
209	struct ib_cm_id id;
210
211	struct rb_node service_node;
212	struct rb_node sidr_id_node;
213	u32 sidr_slid;
214	spinlock_t lock; /* Do not acquire inside cm.lock */
215	struct completion comp;
216	refcount_t refcount;
217	/* Number of clients sharing this ib_cm_id. Only valid for listeners.
218	* Protected by the cm.lock spinlock.
219	*/
220	int listen_sharecount;
221	struct rcu_head rcu;
222
223	struct ib_mad_send_buf *msg;
224	struct cm_timewait_info *timewait_info;
225	/* todo: use alternate port on send failure */
226	struct cm_av av;
227	struct cm_av alt_av;
228
229	void *private_data;
230	__be64 tid;
231	__be32 local_qpn;
232	__be32 remote_qpn;
233	enum ib_qp_type qp_type;
234	__be32 sq_psn;
235	__be32 rq_psn;
236	int timeout_ms;
237	enum ib_mtu path_mtu;
238	__be16 pkey;
239	u8 private_data_len;
240	u8 max_cm_retries;
241	u8 responder_resources;
242	u8 initiator_depth;
243	u8 retry_count;
244	u8 rnr_retry_count;
245	u8 target_ack_delay;
246
247	struct list_head work_list;
248	atomic_t work_count;
249
250	struct rdma_ucm_ece ece;
251	};
252
253	static void cm_dev_release(struct kref *kref)
254	{
255	struct cm_device *cm_dev = container_of(kref, struct cm_device, kref);
256	u32 i;
257
258	rdma_for_each_port(cm_dev->ib_device, i)
259	kfree(objp: cm_dev->port[i - 1]);
260
261	kfree(objp: cm_dev);
262	}
263
264	static void cm_device_put(struct cm_device *cm_dev)
265	{
266	kref_put(kref: &cm_dev->kref, release: cm_dev_release);
267	}
268
269	static void cm_work_handler(struct work_struct *work);
270
271	static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
272	{
273	if (refcount_dec_and_test(r: &cm_id_priv->refcount))
274	complete(&cm_id_priv->comp);
275	}
276
277	static struct ib_mad_send_buf *
278	cm_alloc_msg_agent(struct cm_id_private *cm_id_priv, bool rep_agent)
279	{
280	struct ib_mad_agent *mad_agent;
281	struct ib_mad_send_buf *m;
282	struct ib_ah *ah;
283
284	lockdep_assert_held(&cm_id_priv->lock);
285
286	if (!cm_id_priv->av.port)
287	return ERR_PTR(error: -EINVAL);
288
289	read_lock(&cm_id_priv->av.port->cm_dev->mad_agent_lock);
290	mad_agent = rep_agent ? cm_id_priv->av.port->rep_agent :
291	cm_id_priv->av.port->mad_agent;
292	if (!mad_agent) {
293	m = ERR_PTR(error: -EINVAL);
294	goto out;
295	}
296
297	ah = rdma_create_ah(pd: mad_agent->qp->pd, ah_attr: &cm_id_priv->av.ah_attr, flags: 0);
298	if (IS_ERR(ptr: ah)) {
299	m = ERR_CAST(ptr: ah);
300	goto out;
301	}
302
303	m = ib_create_send_mad(mad_agent, remote_qpn: cm_id_priv->id.remote_cm_qpn,
304	pkey_index: cm_id_priv->av.pkey_index,
305	rmpp_active: 0, hdr_len: IB_MGMT_MAD_HDR, data_len: IB_MGMT_MAD_DATA,
306	GFP_ATOMIC,
307	IB_MGMT_BASE_VERSION);
308	if (IS_ERR(ptr: m)) {
309	rdma_destroy_ah(ah, flags: 0);
310	goto out;
311	}
312
313	m->ah = ah;
314
315	out:
316	read_unlock(&cm_id_priv->av.port->cm_dev->mad_agent_lock);
317	return m;
318	}
319
320	static struct ib_mad_send_buf *cm_alloc_msg(struct cm_id_private *cm_id_priv)
321	{
322	return cm_alloc_msg_agent(cm_id_priv, rep_agent: false);
323	}
324
325	static void cm_free_msg(struct ib_mad_send_buf *msg)
326	{
327	if (msg->ah)
328	rdma_destroy_ah(ah: msg->ah, flags: 0);
329	ib_free_send_mad(send_buf: msg);
330	}
331
332	static struct ib_mad_send_buf *
333	cm_alloc_priv_msg_rep(struct cm_id_private *cm_id_priv, enum ib_cm_state state,
334	bool rep_agent)
335	{
336	struct ib_mad_send_buf *msg;
337
338	lockdep_assert_held(&cm_id_priv->lock);
339
340	msg = cm_alloc_msg_agent(cm_id_priv, rep_agent);
341	if (IS_ERR(ptr: msg))
342	return msg;
343
344	cm_id_priv->msg = msg;
345	refcount_inc(r: &cm_id_priv->refcount);
346	msg->context[0] = cm_id_priv;
347	msg->context[1] = (void *) (unsigned long) state;
348
349	msg->retries = cm_id_priv->max_cm_retries;
350	msg->timeout_ms = cm_id_priv->timeout_ms;
351
352	return msg;
353	}
354
355	static struct ib_mad_send_buf *
356	cm_alloc_priv_msg(struct cm_id_private *cm_id_priv, enum ib_cm_state state)
357	{
358	return cm_alloc_priv_msg_rep(cm_id_priv, state, rep_agent: false);
359	}
360
361	static void cm_free_priv_msg(struct ib_mad_send_buf *msg)
362	{
363	struct cm_id_private *cm_id_priv = msg->context[0];
364
365	lockdep_assert_held(&cm_id_priv->lock);
366
367	if (!WARN_ON(cm_id_priv->msg != msg))
368	cm_id_priv->msg = NULL;
369
370	if (msg->ah)
371	rdma_destroy_ah(ah: msg->ah, flags: 0);
372	cm_deref_id(cm_id_priv);
373	ib_free_send_mad(send_buf: msg);
374	}
375
376	static struct ib_mad_send_buf *
377	cm_alloc_response_msg_no_ah(struct cm_port *port,
378	struct ib_mad_recv_wc *mad_recv_wc,
379	bool direct_retry)
380	{
381	struct ib_mad_send_buf *m;
382
383	m = ib_create_send_mad(mad_agent: port->mad_agent, remote_qpn: 1, pkey_index: mad_recv_wc->wc->pkey_index,
384	rmpp_active: 0, hdr_len: IB_MGMT_MAD_HDR, data_len: IB_MGMT_MAD_DATA,
385	GFP_ATOMIC, IB_MGMT_BASE_VERSION);
386	if (!IS_ERR(ptr: m))
387	m->context[0] = direct_retry ? CM_DIRECT_RETRY_CTX : NULL;
388
389	return m;
390	}
391
392	static int cm_create_response_msg_ah(struct cm_port *port,
393	struct ib_mad_recv_wc *mad_recv_wc,
394	struct ib_mad_send_buf *msg)
395	{
396	struct ib_ah *ah;
397
398	ah = ib_create_ah_from_wc(pd: port->mad_agent->qp->pd, wc: mad_recv_wc->wc,
399	grh: mad_recv_wc->recv_buf.grh, port_num: port->port_num);
400	if (IS_ERR(ptr: ah))
401	return PTR_ERR(ptr: ah);
402
403	msg->ah = ah;
404	return 0;
405	}
406
407	static int cm_alloc_response_msg(struct cm_port *port,
408	struct ib_mad_recv_wc *mad_recv_wc,
409	bool direct_retry,
410	struct ib_mad_send_buf **msg)
411	{
412	struct ib_mad_send_buf *m;
413	int ret;
414
415	m = cm_alloc_response_msg_no_ah(port, mad_recv_wc, direct_retry);
416	if (IS_ERR(ptr: m))
417	return PTR_ERR(ptr: m);
418
419	ret = cm_create_response_msg_ah(port, mad_recv_wc, msg: m);
420	if (ret) {
421	ib_free_send_mad(send_buf: m);
422	return ret;
423	}
424
425	*msg = m;
426	return 0;
427	}
428
429	static void *cm_copy_private_data(const void *private_data, u8 private_data_len)
430	{
431	void *data;
432
433	if (!private_data || !private_data_len)
434	return NULL;
435
436	data = kmemdup(private_data, private_data_len, GFP_KERNEL);
437	if (!data)
438	return ERR_PTR(error: -ENOMEM);
439
440	return data;
441	}
442
443	static void cm_set_private_data(struct cm_id_private *cm_id_priv,
444	void *private_data, u8 private_data_len)
445	{
446	if (cm_id_priv->private_data && cm_id_priv->private_data_len)
447	kfree(objp: cm_id_priv->private_data);
448
449	cm_id_priv->private_data = private_data;
450	cm_id_priv->private_data_len = private_data_len;
451	}
452
453	static void cm_set_av_port(struct cm_av *av, struct cm_port *port)
454	{
455	struct cm_port *old_port = av->port;
456
457	if (old_port == port)
458	return;
459
460	av->port = port;
461	if (old_port)
462	cm_device_put(cm_dev: old_port->cm_dev);
463	if (port)
464	kref_get(kref: &port->cm_dev->kref);
465	}
466
467	static void cm_init_av_for_lap(struct cm_port *port, struct ib_wc *wc,
468	struct rdma_ah_attr *ah_attr, struct cm_av *av)
469	{
470	cm_set_av_port(av, port);
471	av->pkey_index = wc->pkey_index;
472	rdma_move_ah_attr(dest: &av->ah_attr, src: ah_attr);
473	}
474
475	static int cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
476	struct ib_grh *grh, struct cm_av *av)
477	{
478	cm_set_av_port(av, port);
479	av->pkey_index = wc->pkey_index;
480	return ib_init_ah_attr_from_wc(device: port->cm_dev->ib_device,
481	port_num: port->port_num, wc,
482	grh, ah_attr: &av->ah_attr);
483	}
484
485	static struct cm_port *
486	get_cm_port_from_path(struct sa_path_rec *path, const struct ib_gid_attr *attr)
487	{
488	struct cm_device *cm_dev;
489	struct cm_port *port = NULL;
490	unsigned long flags;
491
492	if (attr) {
493	read_lock_irqsave(&cm.device_lock, flags);
494	list_for_each_entry(cm_dev, &cm.device_list, list) {
495	if (cm_dev->ib_device == attr->device) {
496	port = cm_dev->port[attr->port_num - 1];
497	break;
498	}
499	}
500	read_unlock_irqrestore(&cm.device_lock, flags);
501	} else {
502	/* SGID attribute can be NULL in following
503	* conditions.
504	* (a) Alternative path
505	* (b) IB link layer without GRH
506	* (c) LAP send messages
507	*/
508	read_lock_irqsave(&cm.device_lock, flags);
509	list_for_each_entry(cm_dev, &cm.device_list, list) {
510	attr = rdma_find_gid(device: cm_dev->ib_device,
511	gid: &path->sgid,
512	gid_type: sa_conv_pathrec_to_gid_type(rec: path),
513	NULL);
514	if (!IS_ERR(ptr: attr)) {
515	port = cm_dev->port[attr->port_num - 1];
516	break;
517	}
518	}
519	read_unlock_irqrestore(&cm.device_lock, flags);
520	if (port)
521	rdma_put_gid_attr(attr);
522	}
523	return port;
524	}
525
526	static int cm_init_av_by_path(struct sa_path_rec *path,
527	const struct ib_gid_attr *sgid_attr,
528	struct cm_av *av)
529	{
530	struct rdma_ah_attr new_ah_attr;
531	struct cm_device *cm_dev;
532	struct cm_port *port;
533	int ret;
534
535	port = get_cm_port_from_path(path, attr: sgid_attr);
536	if (!port)
537	return -EINVAL;
538	cm_dev = port->cm_dev;
539
540	ret = ib_find_cached_pkey(device: cm_dev->ib_device, port_num: port->port_num,
541	be16_to_cpu(path->pkey), index: &av->pkey_index);
542	if (ret)
543	return ret;
544
545	cm_set_av_port(av, port);
546
547	/*
548	* av->ah_attr might be initialized based on wc or during
549	* request processing time which might have reference to sgid_attr.
550	* So initialize a new ah_attr on stack.
551	* If initialization fails, old ah_attr is used for sending any
552	* responses. If initialization is successful, than new ah_attr
553	* is used by overwriting the old one. So that right ah_attr
554	* can be used to return an error response.
555	*/
556	ret = ib_init_ah_attr_from_path(device: cm_dev->ib_device, port_num: port->port_num, rec: path,
557	ah_attr: &new_ah_attr, sgid_attr);
558	if (ret)
559	return ret;
560
561	av->timeout = path->packet_life_time + 1;
562	rdma_move_ah_attr(dest: &av->ah_attr, src: &new_ah_attr);
563	return 0;
564	}
565
566	/* Move av created by cm_init_av_by_path(), so av.dgid is not moved */
567	static void cm_move_av_from_path(struct cm_av *dest, struct cm_av *src)
568	{
569	cm_set_av_port(av: dest, port: src->port);
570	cm_set_av_port(av: src, NULL);
571	dest->pkey_index = src->pkey_index;
572	rdma_move_ah_attr(dest: &dest->ah_attr, src: &src->ah_attr);
573	dest->timeout = src->timeout;
574	}
575
576	static void cm_destroy_av(struct cm_av *av)
577	{
578	rdma_destroy_ah_attr(ah_attr: &av->ah_attr);
579	cm_set_av_port(av, NULL);
580	}
581
582	static u32 cm_local_id(__be32 local_id)
583	{
584	return (__force u32) (local_id ^ cm.random_id_operand);
585	}
586
587	static struct cm_id_private *cm_acquire_id(__be32 local_id, __be32 remote_id)
588	{
589	struct cm_id_private *cm_id_priv;
590
591	rcu_read_lock();
592	cm_id_priv = xa_load(&cm.local_id_table, index: cm_local_id(local_id));
593	if (!cm_id_priv || cm_id_priv->id.remote_id != remote_id ||
594	!refcount_inc_not_zero(r: &cm_id_priv->refcount))
595	cm_id_priv = NULL;
596	rcu_read_unlock();
597
598	return cm_id_priv;
599	}
600
601	/*
602	* Trivial helpers to strip endian annotation and compare; the
603	* endianness doesn't actually matter since we just need a stable
604	* order for the RB tree.
605	*/
606	static int be32_lt(__be32 a, __be32 b)
607	{
608	return (__force u32) a < (__force u32) b;
609	}
610
611	static int be32_gt(__be32 a, __be32 b)
612	{
613	return (__force u32) a > (__force u32) b;
614	}
615
616	static int be64_lt(__be64 a, __be64 b)
617	{
618	return (__force u64) a < (__force u64) b;
619	}
620
621	static int be64_gt(__be64 a, __be64 b)
622	{
623	return (__force u64) a > (__force u64) b;
624	}
625
626	/*
627	* Inserts a new cm_id_priv into the listen_service_table. Returns cm_id_priv
628	* if the new ID was inserted, NULL if it could not be inserted due to a
629	* collision, or the existing cm_id_priv ready for shared usage.
630	*/
631	static struct cm_id_private *cm_insert_listen(struct cm_id_private *cm_id_priv,
632	ib_cm_handler shared_handler)
633	{
634	struct rb_node **link = &cm.listen_service_table.rb_node;
635	struct rb_node *parent = NULL;
636	struct cm_id_private *cur_cm_id_priv;
637	__be64 service_id = cm_id_priv->id.service_id;
638	unsigned long flags;
639
640	spin_lock_irqsave(&cm.lock, flags);
641	while (*link) {
642	parent = *link;
643	cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
644	service_node);
645
646	if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
647	link = &(*link)->rb_left;
648	else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
649	link = &(*link)->rb_right;
650	else if (be64_lt(a: service_id, b: cur_cm_id_priv->id.service_id))
651	link = &(*link)->rb_left;
652	else if (be64_gt(a: service_id, b: cur_cm_id_priv->id.service_id))
653	link = &(*link)->rb_right;
654	else {
655	/*
656	* Sharing an ib_cm_id with different handlers is not
657	* supported
658	*/
659	if (cur_cm_id_priv->id.cm_handler != shared_handler ||
660	cur_cm_id_priv->id.context ||
661	WARN_ON(!cur_cm_id_priv->id.cm_handler)) {
662	spin_unlock_irqrestore(lock: &cm.lock, flags);
663	return NULL;
664	}
665	refcount_inc(r: &cur_cm_id_priv->refcount);
666	cur_cm_id_priv->listen_sharecount++;
667	spin_unlock_irqrestore(lock: &cm.lock, flags);
668	return cur_cm_id_priv;
669	}
670	}
671	cm_id_priv->listen_sharecount++;
672	rb_link_node(node: &cm_id_priv->service_node, parent, rb_link: link);
673	rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
674	spin_unlock_irqrestore(lock: &cm.lock, flags);
675	return cm_id_priv;
676	}
677
678	static struct cm_id_private *cm_find_listen(struct ib_device *device,
679	__be64 service_id)
680	{
681	struct rb_node *node = cm.listen_service_table.rb_node;
682	struct cm_id_private *cm_id_priv;
683
684	while (node) {
685	cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
686
687	if (device < cm_id_priv->id.device)
688	node = node->rb_left;
689	else if (device > cm_id_priv->id.device)
690	node = node->rb_right;
691	else if (be64_lt(a: service_id, b: cm_id_priv->id.service_id))
692	node = node->rb_left;
693	else if (be64_gt(a: service_id, b: cm_id_priv->id.service_id))
694	node = node->rb_right;
695	else {
696	refcount_inc(r: &cm_id_priv->refcount);
697	return cm_id_priv;
698	}
699	}
700	return NULL;
701	}
702
703	static struct cm_timewait_info *
704	cm_insert_remote_id(struct cm_timewait_info *timewait_info)
705	{
706	struct rb_node **link = &cm.remote_id_table.rb_node;
707	struct rb_node *parent = NULL;
708	struct cm_timewait_info *cur_timewait_info;
709	__be64 remote_ca_guid = timewait_info->remote_ca_guid;
710	__be32 remote_id = timewait_info->work.remote_id;
711
712	while (*link) {
713	parent = *link;
714	cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
715	remote_id_node);
716	if (be32_lt(a: remote_id, b: cur_timewait_info->work.remote_id))
717	link = &(*link)->rb_left;
718	else if (be32_gt(a: remote_id, b: cur_timewait_info->work.remote_id))
719	link = &(*link)->rb_right;
720	else if (be64_lt(a: remote_ca_guid, b: cur_timewait_info->remote_ca_guid))
721	link = &(*link)->rb_left;
722	else if (be64_gt(a: remote_ca_guid, b: cur_timewait_info->remote_ca_guid))
723	link = &(*link)->rb_right;
724	else
725	return cur_timewait_info;
726	}
727	timewait_info->inserted_remote_id = 1;
728	rb_link_node(node: &timewait_info->remote_id_node, parent, rb_link: link);
729	rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
730	return NULL;
731	}
732
733	static struct cm_id_private *cm_find_remote_id(__be64 remote_ca_guid,
734	__be32 remote_id)
735	{
736	struct rb_node *node = cm.remote_id_table.rb_node;
737	struct cm_timewait_info *timewait_info;
738	struct cm_id_private *res = NULL;
739
740	spin_lock_irq(lock: &cm.lock);
741	while (node) {
742	timewait_info = rb_entry(node, struct cm_timewait_info,
743	remote_id_node);
744	if (be32_lt(a: remote_id, b: timewait_info->work.remote_id))
745	node = node->rb_left;
746	else if (be32_gt(a: remote_id, b: timewait_info->work.remote_id))
747	node = node->rb_right;
748	else if (be64_lt(a: remote_ca_guid, b: timewait_info->remote_ca_guid))
749	node = node->rb_left;
750	else if (be64_gt(a: remote_ca_guid, b: timewait_info->remote_ca_guid))
751	node = node->rb_right;
752	else {
753	res = cm_acquire_id(local_id: timewait_info->work.local_id,
754	remote_id: timewait_info->work.remote_id);
755	break;
756	}
757	}
758	spin_unlock_irq(lock: &cm.lock);
759	return res;
760	}
761
762	static struct cm_timewait_info *
763	cm_insert_remote_qpn(struct cm_timewait_info *timewait_info)
764	{
765	struct rb_node **link = &cm.remote_qp_table.rb_node;
766	struct rb_node *parent = NULL;
767	struct cm_timewait_info *cur_timewait_info;
768	__be64 remote_ca_guid = timewait_info->remote_ca_guid;
769	__be32 remote_qpn = timewait_info->remote_qpn;
770
771	while (*link) {
772	parent = *link;
773	cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
774	remote_qp_node);
775	if (be32_lt(a: remote_qpn, b: cur_timewait_info->remote_qpn))
776	link = &(*link)->rb_left;
777	else if (be32_gt(a: remote_qpn, b: cur_timewait_info->remote_qpn))
778	link = &(*link)->rb_right;
779	else if (be64_lt(a: remote_ca_guid, b: cur_timewait_info->remote_ca_guid))
780	link = &(*link)->rb_left;
781	else if (be64_gt(a: remote_ca_guid, b: cur_timewait_info->remote_ca_guid))
782	link = &(*link)->rb_right;
783	else
784	return cur_timewait_info;
785	}
786	timewait_info->inserted_remote_qp = 1;
787	rb_link_node(node: &timewait_info->remote_qp_node, parent, rb_link: link);
788	rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
789	return NULL;
790	}
791
792	static struct cm_id_private *
793	cm_insert_remote_sidr(struct cm_id_private *cm_id_priv)
794	{
795	struct rb_node **link = &cm.remote_sidr_table.rb_node;
796	struct rb_node *parent = NULL;
797	struct cm_id_private *cur_cm_id_priv;
798	__be32 remote_id = cm_id_priv->id.remote_id;
799
800	while (*link) {
801	parent = *link;
802	cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
803	sidr_id_node);
804	if (be32_lt(a: remote_id, b: cur_cm_id_priv->id.remote_id))
805	link = &(*link)->rb_left;
806	else if (be32_gt(a: remote_id, b: cur_cm_id_priv->id.remote_id))
807	link = &(*link)->rb_right;
808	else {
809	if (cur_cm_id_priv->sidr_slid < cm_id_priv->sidr_slid)
810	link = &(*link)->rb_left;
811	else if (cur_cm_id_priv->sidr_slid > cm_id_priv->sidr_slid)
812	link = &(*link)->rb_right;
813	else
814	return cur_cm_id_priv;
815	}
816	}
817	rb_link_node(node: &cm_id_priv->sidr_id_node, parent, rb_link: link);
818	rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
819	return NULL;
820	}
821
822	static struct cm_id_private *cm_alloc_id_priv(struct ib_device *device,
823	ib_cm_handler cm_handler,
824	void *context)
825	{
826	struct cm_id_private *cm_id_priv;
827	u32 id;
828	int ret;
829
830	cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
831	if (!cm_id_priv)
832	return ERR_PTR(error: -ENOMEM);
833
834	cm_id_priv->id.state = IB_CM_IDLE;
835	cm_id_priv->id.device = device;
836	cm_id_priv->id.cm_handler = cm_handler;
837	cm_id_priv->id.context = context;
838	cm_id_priv->id.remote_cm_qpn = 1;
839
840	RB_CLEAR_NODE(&cm_id_priv->service_node);
841	RB_CLEAR_NODE(&cm_id_priv->sidr_id_node);
842	spin_lock_init(&cm_id_priv->lock);
843	init_completion(x: &cm_id_priv->comp);
844	INIT_LIST_HEAD(list: &cm_id_priv->work_list);
845	atomic_set(v: &cm_id_priv->work_count, i: -1);
846	refcount_set(r: &cm_id_priv->refcount, n: 1);
847
848	ret = xa_alloc_cyclic(xa: &cm.local_id_table, id: &id, NULL, xa_limit_32b,
849	next: &cm.local_id_next, GFP_KERNEL);
850	if (ret < 0)
851	goto error;
852	cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand;
853
854	return cm_id_priv;
855
856	error:
857	kfree(objp: cm_id_priv);
858	return ERR_PTR(error: ret);
859	}
860
861	/*
862	* Make the ID visible to the MAD handlers and other threads that use the
863	* xarray.
864	*/
865	static void cm_finalize_id(struct cm_id_private *cm_id_priv)
866	{
867	xa_store(&cm.local_id_table, index: cm_local_id(local_id: cm_id_priv->id.local_id),
868	entry: cm_id_priv, GFP_ATOMIC);
869	}
870
871	struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
872	ib_cm_handler cm_handler,
873	void *context)
874	{
875	struct cm_id_private *cm_id_priv;
876
877	cm_id_priv = cm_alloc_id_priv(device, cm_handler, context);
878	if (IS_ERR(ptr: cm_id_priv))
879	return ERR_CAST(ptr: cm_id_priv);
880
881	cm_finalize_id(cm_id_priv);
882	return &cm_id_priv->id;
883	}
884	EXPORT_SYMBOL(ib_create_cm_id);
885
886	static struct cm_work *cm_dequeue_work(struct cm_id_private *cm_id_priv)
887	{
888	struct cm_work *work;
889
890	if (list_empty(head: &cm_id_priv->work_list))
891	return NULL;
892
893	work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
894	list_del(entry: &work->list);
895	return work;
896	}
897
898	static void cm_free_work(struct cm_work *work)
899	{
900	if (work->mad_recv_wc)
901	ib_free_recv_mad(mad_recv_wc: work->mad_recv_wc);
902	kfree(objp: work);
903	}
904
905	static void cm_queue_work_unlock(struct cm_id_private *cm_id_priv,
906	struct cm_work *work)
907	__releases(&cm_id_priv->lock)
908	{
909	bool immediate;
910
911	/*
912	* To deliver the event to the user callback we have the drop the
913	* spinlock, however, we need to ensure that the user callback is single
914	* threaded and receives events in the temporal order. If there are
915	* already events being processed then thread new events onto a list,
916	* the thread currently processing will pick them up.
917	*/
918	immediate = atomic_inc_and_test(v: &cm_id_priv->work_count);
919	if (!immediate) {
920	list_add_tail(new: &work->list, head: &cm_id_priv->work_list);
921	/*
922	* This routine always consumes incoming reference. Once queued
923	* to the work_list then a reference is held by the thread
924	* currently running cm_process_work() and this reference is not
925	* needed.
926	*/
927	cm_deref_id(cm_id_priv);
928	}
929	spin_unlock_irq(lock: &cm_id_priv->lock);
930
931	if (immediate)
932	cm_process_work(cm_id_priv, work);
933	}
934
935	static inline int cm_convert_to_ms(int iba_time)
936	{
937	/* approximate conversion to ms from 4.096us x 2^iba_time */
938	return 1 << max(iba_time - 8, 0);
939	}
940
941	/*
942	* calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time
943	* Because of how ack_timeout is stored, adding one doubles the timeout.
944	* To avoid large timeouts, select the max(ack_delay, life_time + 1), and
945	* increment it (round up) only if the other is within 50%.
946	*/
947	static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time)
948	{
949	int ack_timeout = packet_life_time + 1;
950
951	if (ack_timeout >= ca_ack_delay)
952	ack_timeout += (ca_ack_delay >= (ack_timeout - 1));
953	else
954	ack_timeout = ca_ack_delay +
955	(ack_timeout >= (ca_ack_delay - 1));
956
957	return min(31, ack_timeout);
958	}
959
960	static void cm_remove_remote(struct cm_id_private *cm_id_priv)
961	{
962	struct cm_timewait_info *timewait_info = cm_id_priv->timewait_info;
963
964	if (timewait_info->inserted_remote_id) {
965	rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
966	timewait_info->inserted_remote_id = 0;
967	}
968
969	if (timewait_info->inserted_remote_qp) {
970	rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
971	timewait_info->inserted_remote_qp = 0;
972	}
973	}
974
975	static struct cm_timewait_info *cm_create_timewait_info(__be32 local_id)
976	{
977	struct cm_timewait_info *timewait_info;
978
979	timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
980	if (!timewait_info)
981	return ERR_PTR(error: -ENOMEM);
982
983	timewait_info->work.local_id = local_id;
984	INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler);
985	timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
986	return timewait_info;
987	}
988
989	static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
990	{
991	int wait_time;
992	unsigned long flags;
993	struct cm_device *cm_dev;
994
995	lockdep_assert_held(&cm_id_priv->lock);
996
997	cm_dev = ib_get_client_data(device: cm_id_priv->id.device, client: &cm_client);
998	if (!cm_dev)
999	return;
1000
1001	spin_lock_irqsave(&cm.lock, flags);
1002	cm_remove_remote(cm_id_priv);
1003	list_add_tail(new: &cm_id_priv->timewait_info->list, head: &cm.timewait_list);
1004	spin_unlock_irqrestore(lock: &cm.lock, flags);
1005
1006	/*
1007	* The cm_id could be destroyed by the user before we exit timewait.
1008	* To protect against this, we search for the cm_id after exiting
1009	* timewait before notifying the user that we've exited timewait.
1010	*/
1011	cm_id_priv->id.state = IB_CM_TIMEWAIT;
1012	wait_time = cm_convert_to_ms(iba_time: cm_id_priv->av.timeout);
1013
1014	/* Check if the device started its remove_one */
1015	spin_lock_irqsave(&cm.lock, flags);
1016	if (!cm_dev->going_down)
1017	queue_delayed_work(wq: cm.wq, dwork: &cm_id_priv->timewait_info->work.work,
1018	delay: msecs_to_jiffies(m: wait_time));
1019	spin_unlock_irqrestore(lock: &cm.lock, flags);
1020
1021	/*
1022	* The timewait_info is converted into a work and gets freed during
1023	* cm_free_work() in cm_timewait_handler().
1024	*/
1025	BUILD_BUG_ON(offsetof(struct cm_timewait_info, work) != 0);
1026	cm_id_priv->timewait_info = NULL;
1027	}
1028
1029	static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
1030	{
1031	unsigned long flags;
1032
1033	lockdep_assert_held(&cm_id_priv->lock);
1034
1035	cm_id_priv->id.state = IB_CM_IDLE;
1036	if (cm_id_priv->timewait_info) {
1037	spin_lock_irqsave(&cm.lock, flags);
1038	cm_remove_remote(cm_id_priv);
1039	spin_unlock_irqrestore(lock: &cm.lock, flags);
1040	kfree(objp: cm_id_priv->timewait_info);
1041	cm_id_priv->timewait_info = NULL;
1042	}
1043	}
1044
1045	static noinline void cm_destroy_id_wait_timeout(struct ib_cm_id *cm_id,
1046	enum ib_cm_state old_state)
1047	{
1048	struct cm_id_private *cm_id_priv;
1049
1050	cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1051	pr_err_ratelimited("%s: cm_id=%p timed out. state %d -> %d, refcnt=%d\n", __func__,
1052	cm_id, old_state, cm_id->state, refcount_read(&cm_id_priv->refcount));
1053	}
1054
1055	static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
1056	{
1057	struct cm_id_private *cm_id_priv;
1058	enum ib_cm_state old_state;
1059	unsigned long timeout;
1060	struct cm_work *work;
1061	int ret;
1062
1063	cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1064	spin_lock_irq(lock: &cm_id_priv->lock);
1065	old_state = cm_id->state;
1066	retest:
1067	switch (cm_id->state) {
1068	case IB_CM_LISTEN:
1069	spin_lock(lock: &cm.lock);
1070	if (--cm_id_priv->listen_sharecount > 0) {
1071	/* The id is still shared. */
1072	WARN_ON(refcount_read(&cm_id_priv->refcount) == 1);
1073	spin_unlock(lock: &cm.lock);
1074	spin_unlock_irq(lock: &cm_id_priv->lock);
1075	cm_deref_id(cm_id_priv);
1076	return;
1077	}
1078	cm_id->state = IB_CM_IDLE;
1079	rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
1080	RB_CLEAR_NODE(&cm_id_priv->service_node);
1081	spin_unlock(lock: &cm.lock);
1082	break;
1083	case IB_CM_SIDR_REQ_SENT:
1084	cm_id->state = IB_CM_IDLE;
1085	ib_cancel_mad(send_buf: cm_id_priv->msg);
1086	break;
1087	case IB_CM_SIDR_REQ_RCVD:
1088	cm_send_sidr_rep_locked(cm_id_priv,
1089	param: &(struct ib_cm_sidr_rep_param){
1090	.status = IB_SIDR_REJECT });
1091	/* cm_send_sidr_rep_locked will not move to IDLE if it fails */
1092	cm_id->state = IB_CM_IDLE;
1093	break;
1094	case IB_CM_REQ_SENT:
1095	case IB_CM_MRA_REQ_RCVD:
1096	ib_cancel_mad(send_buf: cm_id_priv->msg);
1097	cm_send_rej_locked(cm_id_priv, reason: IB_CM_REJ_TIMEOUT,
1098	ari: &cm_id_priv->id.device->node_guid,
1099	ari_length: sizeof(cm_id_priv->id.device->node_guid),
1100	NULL, private_data_len: 0);
1101	break;
1102	case IB_CM_REQ_RCVD:
1103	if (err == -ENOMEM) {
1104	/* Do not reject to allow future retries. */
1105	cm_reset_to_idle(cm_id_priv);
1106	} else {
1107	cm_send_rej_locked(cm_id_priv,
1108	reason: IB_CM_REJ_CONSUMER_DEFINED, NULL, ari_length: 0,
1109	NULL, private_data_len: 0);
1110	}
1111	break;
1112	case IB_CM_REP_SENT:
1113	case IB_CM_MRA_REP_RCVD:
1114	ib_cancel_mad(send_buf: cm_id_priv->msg);
1115	cm_send_rej_locked(cm_id_priv, reason: IB_CM_REJ_CONSUMER_DEFINED, NULL,
1116	ari_length: 0, NULL, private_data_len: 0);
1117	goto retest;
1118	case IB_CM_MRA_REQ_SENT:
1119	case IB_CM_REP_RCVD:
1120	case IB_CM_MRA_REP_SENT:
1121	cm_send_rej_locked(cm_id_priv, reason: IB_CM_REJ_CONSUMER_DEFINED, NULL,
1122	ari_length: 0, NULL, private_data_len: 0);
1123	break;
1124	case IB_CM_ESTABLISHED:
1125	if (cm_id_priv->qp_type == IB_QPT_XRC_TGT) {
1126	cm_id->state = IB_CM_IDLE;
1127	break;
1128	}
1129	cm_issue_dreq(cm_id_priv);
1130	cm_enter_timewait(cm_id_priv);
1131	goto retest;
1132	case IB_CM_DREQ_SENT:
1133	ib_cancel_mad(send_buf: cm_id_priv->msg);
1134	cm_enter_timewait(cm_id_priv);
1135	goto retest;
1136	case IB_CM_DREQ_RCVD:
1137	cm_send_drep_locked(cm_id_priv, NULL, private_data_len: 0);
1138	WARN_ON(cm_id->state != IB_CM_TIMEWAIT);
1139	goto retest;
1140	case IB_CM_TIMEWAIT:
1141	/*
1142	* The cm_acquire_id in cm_timewait_handler will stop working
1143	* once we do xa_erase below, so just move to idle here for
1144	* consistency.
1145	*/
1146	cm_id->state = IB_CM_IDLE;
1147	break;
1148	case IB_CM_IDLE:
1149	break;
1150	}
1151	WARN_ON(cm_id->state != IB_CM_IDLE);
1152
1153	spin_lock(lock: &cm.lock);
1154	/* Required for cleanup paths related cm_req_handler() */
1155	if (cm_id_priv->timewait_info) {
1156	cm_remove_remote(cm_id_priv);
1157	kfree(objp: cm_id_priv->timewait_info);
1158	cm_id_priv->timewait_info = NULL;
1159	}
1160
1161	WARN_ON(cm_id_priv->listen_sharecount);
1162	WARN_ON(!RB_EMPTY_NODE(&cm_id_priv->service_node));
1163	if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node))
1164	rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
1165	spin_unlock(lock: &cm.lock);
1166	spin_unlock_irq(lock: &cm_id_priv->lock);
1167
1168	xa_erase(&cm.local_id_table, index: cm_local_id(local_id: cm_id->local_id));
1169	cm_deref_id(cm_id_priv);
1170	timeout = msecs_to_jiffies(m: (cm_id_priv->max_cm_retries * cm_id_priv->timeout_ms * 5) / 4);
1171	do {
1172	ret = wait_for_completion_timeout(x: &cm_id_priv->comp, timeout);
1173	if (!ret) /* timeout happened */
1174	cm_destroy_id_wait_timeout(cm_id, old_state);
1175	} while (!ret);
1176
1177	while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
1178	cm_free_work(work);
1179
1180	cm_destroy_av(av: &cm_id_priv->av);
1181	cm_destroy_av(av: &cm_id_priv->alt_av);
1182	kfree(objp: cm_id_priv->private_data);
1183	kfree_rcu(cm_id_priv, rcu);
1184	}
1185
1186	void ib_destroy_cm_id(struct ib_cm_id *cm_id)
1187	{
1188	cm_destroy_id(cm_id, err: 0);
1189	}
1190	EXPORT_SYMBOL(ib_destroy_cm_id);
1191
1192	static int cm_init_listen(struct cm_id_private *cm_id_priv, __be64 service_id)
1193	{
1194	if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
1195	(service_id != IB_CM_ASSIGN_SERVICE_ID))
1196	return -EINVAL;
1197
1198	if (service_id == IB_CM_ASSIGN_SERVICE_ID)
1199	cm_id_priv->id.service_id = cpu_to_be64(cm.listen_service_id++);
1200	else
1201	cm_id_priv->id.service_id = service_id;
1202
1203	return 0;
1204	}
1205
1206	/**
1207	* ib_cm_listen - Initiates listening on the specified service ID for
1208	* connection and service ID resolution requests.
1209	* @cm_id: Connection identifier associated with the listen request.
1210	* @service_id: Service identifier matched against incoming connection
1211	* and service ID resolution requests. The service ID should be specified
1212	* network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will
1213	* assign a service ID to the caller.
1214	*/
1215	int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id)
1216	{
1217	struct cm_id_private *cm_id_priv =
1218	container_of(cm_id, struct cm_id_private, id);
1219	unsigned long flags;
1220	int ret;
1221
1222	spin_lock_irqsave(&cm_id_priv->lock, flags);
1223	if (cm_id_priv->id.state != IB_CM_IDLE) {
1224	ret = -EINVAL;
1225	goto out;
1226	}
1227
1228	ret = cm_init_listen(cm_id_priv, service_id);
1229	if (ret)
1230	goto out;
1231
1232	if (!cm_insert_listen(cm_id_priv, NULL)) {
1233	ret = -EBUSY;
1234	goto out;
1235	}
1236
1237	cm_id_priv->id.state = IB_CM_LISTEN;
1238	ret = 0;
1239
1240	out:
1241	spin_unlock_irqrestore(lock: &cm_id_priv->lock, flags);
1242	return ret;
1243	}
1244	EXPORT_SYMBOL(ib_cm_listen);
1245
1246	/**
1247	* ib_cm_insert_listen - Create a new listening ib_cm_id and listen on
1248	* the given service ID.
1249	*
1250	* If there's an existing ID listening on that same device and service ID,
1251	* return it.
1252	*
1253	* @device: Device associated with the cm_id. All related communication will
1254	* be associated with the specified device.
1255	* @cm_handler: Callback invoked to notify the user of CM events.
1256	* @service_id: Service identifier matched against incoming connection
1257	* and service ID resolution requests. The service ID should be specified
1258	* network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will
1259	* assign a service ID to the caller.
1260	*
1261	* Callers should call ib_destroy_cm_id when done with the listener ID.
1262	*/
1263	struct ib_cm_id *ib_cm_insert_listen(struct ib_device *device,
1264	ib_cm_handler cm_handler,
1265	__be64 service_id)
1266	{
1267	struct cm_id_private *listen_id_priv;
1268	struct cm_id_private *cm_id_priv;
1269	int err = 0;
1270
1271	/* Create an ID in advance, since the creation may sleep */
1272	cm_id_priv = cm_alloc_id_priv(device, cm_handler, NULL);
1273	if (IS_ERR(ptr: cm_id_priv))
1274	return ERR_CAST(ptr: cm_id_priv);
1275
1276	err = cm_init_listen(cm_id_priv, service_id);
1277	if (err) {
1278	ib_destroy_cm_id(&cm_id_priv->id);
1279	return ERR_PTR(error: err);
1280	}
1281
1282	spin_lock_irq(lock: &cm_id_priv->lock);
1283	listen_id_priv = cm_insert_listen(cm_id_priv, shared_handler: cm_handler);
1284	if (listen_id_priv != cm_id_priv) {
1285	spin_unlock_irq(lock: &cm_id_priv->lock);
1286	ib_destroy_cm_id(&cm_id_priv->id);
1287	if (!listen_id_priv)
1288	return ERR_PTR(error: -EINVAL);
1289	return &listen_id_priv->id;
1290	}
1291	cm_id_priv->id.state = IB_CM_LISTEN;
1292	spin_unlock_irq(lock: &cm_id_priv->lock);
1293
1294	/*
1295	* A listen ID does not need to be in the xarray since it does not
1296	* receive mads, is not placed in the remote_id or remote_qpn rbtree,
1297	* and does not enter timewait.
1298	*/
1299
1300	return &cm_id_priv->id;
1301	}
1302	EXPORT_SYMBOL(ib_cm_insert_listen);
1303
1304	static __be64 cm_form_tid(struct cm_id_private *cm_id_priv)
1305	{
1306	u64 hi_tid = 0, low_tid;
1307
1308	lockdep_assert_held(&cm_id_priv->lock);
1309
1310	low_tid = (u64)cm_id_priv->id.local_id;
1311	if (!cm_id_priv->av.port)
1312	return cpu_to_be64(low_tid);
1313
1314	read_lock(&cm_id_priv->av.port->cm_dev->mad_agent_lock);
1315	if (cm_id_priv->av.port->mad_agent)
1316	hi_tid = ((u64)cm_id_priv->av.port->mad_agent->hi_tid) << 32;
1317	read_unlock(&cm_id_priv->av.port->cm_dev->mad_agent_lock);
1318	return cpu_to_be64(hi_tid | low_tid);
1319	}
1320
1321	static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
1322	__be16 attr_id, __be64 tid)
1323	{
1324	hdr->base_version = IB_MGMT_BASE_VERSION;
1325	hdr->mgmt_class = IB_MGMT_CLASS_CM;
1326	hdr->class_version = IB_CM_CLASS_VERSION;
1327	hdr->method = IB_MGMT_METHOD_SEND;
1328	hdr->attr_id = attr_id;
1329	hdr->tid = tid;
1330	}
1331
1332	static void cm_format_mad_ece_hdr(struct ib_mad_hdr *hdr, __be16 attr_id,
1333	__be64 tid, u32 attr_mod)
1334	{
1335	cm_format_mad_hdr(hdr, attr_id, tid);
1336	hdr->attr_mod = cpu_to_be32(attr_mod);
1337	}
1338
1339	static void cm_format_req(struct cm_req_msg *req_msg,
1340	struct cm_id_private *cm_id_priv,
1341	struct ib_cm_req_param *param)
1342	{
1343	struct sa_path_rec *pri_path = param->primary_path;
1344	struct sa_path_rec *alt_path = param->alternate_path;
1345	bool pri_ext = false;
1346	__be16 lid;
1347
1348	if (pri_path->rec_type == SA_PATH_REC_TYPE_OPA)
1349	pri_ext = opa_is_extended_lid(dlid: pri_path->opa.dlid,
1350	slid: pri_path->opa.slid);
1351
1352	cm_format_mad_ece_hdr(hdr: &req_msg->hdr, CM_REQ_ATTR_ID,
1353	tid: cm_form_tid(cm_id_priv), attr_mod: param->ece.attr_mod);
1354
1355	IBA_SET(CM_REQ_LOCAL_COMM_ID, req_msg,
1356	be32_to_cpu(cm_id_priv->id.local_id));
1357	IBA_SET(CM_REQ_SERVICE_ID, req_msg, be64_to_cpu(param->service_id));
1358	IBA_SET(CM_REQ_LOCAL_CA_GUID, req_msg,
1359	be64_to_cpu(cm_id_priv->id.device->node_guid));
1360	IBA_SET(CM_REQ_LOCAL_QPN, req_msg, param->qp_num);
1361	IBA_SET(CM_REQ_INITIATOR_DEPTH, req_msg, param->initiator_depth);
1362	IBA_SET(CM_REQ_REMOTE_CM_RESPONSE_TIMEOUT, req_msg,
1363	param->remote_cm_response_timeout);
1364	cm_req_set_qp_type(req_msg, qp_type: param->qp_type);
1365	IBA_SET(CM_REQ_END_TO_END_FLOW_CONTROL, req_msg, param->flow_control);
1366	IBA_SET(CM_REQ_STARTING_PSN, req_msg, param->starting_psn);
1367	IBA_SET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg,
1368	param->local_cm_response_timeout);
1369	IBA_SET(CM_REQ_PARTITION_KEY, req_msg,
1370	be16_to_cpu(param->primary_path->pkey));
1371	IBA_SET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg,
1372	param->primary_path->mtu);
1373	IBA_SET(CM_REQ_MAX_CM_RETRIES, req_msg, param->max_cm_retries);
1374
1375	if (param->qp_type != IB_QPT_XRC_INI) {
1376	IBA_SET(CM_REQ_RESPONDER_RESOURCES, req_msg,
1377	param->responder_resources);
1378	IBA_SET(CM_REQ_RETRY_COUNT, req_msg, param->retry_count);
1379	IBA_SET(CM_REQ_RNR_RETRY_COUNT, req_msg,
1380	param->rnr_retry_count);
1381	IBA_SET(CM_REQ_SRQ, req_msg, param->srq);
1382	}
1383
1384	*IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg) =
1385	pri_path->sgid;
1386	*IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg) =
1387	pri_path->dgid;
1388	if (pri_ext) {
1389	IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg)
1390	->global.interface_id =
1391	OPA_MAKE_ID(be32_to_cpu(pri_path->opa.slid));
1392	IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg)
1393	->global.interface_id =
1394	OPA_MAKE_ID(be32_to_cpu(pri_path->opa.dlid));
1395	}
1396	if (pri_path->hop_limit <= 1) {
1397	IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg,
1398	be16_to_cpu(pri_ext ? 0 :
1399	htons(ntohl(sa_path_get_slid(
1400	pri_path)))));
1401	IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg,
1402	be16_to_cpu(pri_ext ? 0 :
1403	htons(ntohl(sa_path_get_dlid(
1404	pri_path)))));
1405	} else {
1406
1407	if (param->primary_path_inbound) {
1408	lid = param->primary_path_inbound->ib.dlid;
1409	IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg,
1410	be16_to_cpu(lid));
1411	} else
1412	IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg,
1413	be16_to_cpu(IB_LID_PERMISSIVE));
1414
1415	/* Work-around until there's a way to obtain remote LID info */
1416	IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg,
1417	be16_to_cpu(IB_LID_PERMISSIVE));
1418	}
1419	IBA_SET(CM_REQ_PRIMARY_FLOW_LABEL, req_msg,
1420	be32_to_cpu(pri_path->flow_label));
1421	IBA_SET(CM_REQ_PRIMARY_PACKET_RATE, req_msg, pri_path->rate);
1422	IBA_SET(CM_REQ_PRIMARY_TRAFFIC_CLASS, req_msg, pri_path->traffic_class);
1423	IBA_SET(CM_REQ_PRIMARY_HOP_LIMIT, req_msg, pri_path->hop_limit);
1424	IBA_SET(CM_REQ_PRIMARY_SL, req_msg, pri_path->sl);
1425	IBA_SET(CM_REQ_PRIMARY_SUBNET_LOCAL, req_msg,
1426	(pri_path->hop_limit <= 1));
1427	IBA_SET(CM_REQ_PRIMARY_LOCAL_ACK_TIMEOUT, req_msg,
1428	cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1429	pri_path->packet_life_time));
1430
1431	if (alt_path) {
1432	bool alt_ext = false;
1433
1434	if (alt_path->rec_type == SA_PATH_REC_TYPE_OPA)
1435	alt_ext = opa_is_extended_lid(dlid: alt_path->opa.dlid,
1436	slid: alt_path->opa.slid);
1437
1438	*IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg) =
1439	alt_path->sgid;
1440	*IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg) =
1441	alt_path->dgid;
1442	if (alt_ext) {
1443	IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID,
1444	req_msg)
1445	->global.interface_id =
1446	OPA_MAKE_ID(be32_to_cpu(alt_path->opa.slid));
1447	IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_REMOTE_PORT_GID,
1448	req_msg)
1449	->global.interface_id =
1450	OPA_MAKE_ID(be32_to_cpu(alt_path->opa.dlid));
1451	}
1452	if (alt_path->hop_limit <= 1) {
1453	IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg,
1454	be16_to_cpu(
1455	alt_ext ? 0 :
1456	htons(ntohl(sa_path_get_slid(
1457	alt_path)))));
1458	IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg,
1459	be16_to_cpu(
1460	alt_ext ? 0 :
1461	htons(ntohl(sa_path_get_dlid(
1462	alt_path)))));
1463	} else {
1464	IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg,
1465	be16_to_cpu(IB_LID_PERMISSIVE));
1466	IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg,
1467	be16_to_cpu(IB_LID_PERMISSIVE));
1468	}
1469	IBA_SET(CM_REQ_ALTERNATE_FLOW_LABEL, req_msg,
1470	be32_to_cpu(alt_path->flow_label));
1471	IBA_SET(CM_REQ_ALTERNATE_PACKET_RATE, req_msg, alt_path->rate);
1472	IBA_SET(CM_REQ_ALTERNATE_TRAFFIC_CLASS, req_msg,
1473	alt_path->traffic_class);
1474	IBA_SET(CM_REQ_ALTERNATE_HOP_LIMIT, req_msg,
1475	alt_path->hop_limit);
1476	IBA_SET(CM_REQ_ALTERNATE_SL, req_msg, alt_path->sl);
1477	IBA_SET(CM_REQ_ALTERNATE_SUBNET_LOCAL, req_msg,
1478	(alt_path->hop_limit <= 1));
1479	IBA_SET(CM_REQ_ALTERNATE_LOCAL_ACK_TIMEOUT, req_msg,
1480	cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1481	alt_path->packet_life_time));
1482	}
1483	IBA_SET(CM_REQ_VENDOR_ID, req_msg, param->ece.vendor_id);
1484
1485	if (param->private_data && param->private_data_len)
1486	IBA_SET_MEM(CM_REQ_PRIVATE_DATA, req_msg, param->private_data,
1487	param->private_data_len);
1488	}
1489
1490	static int cm_validate_req_param(struct ib_cm_req_param *param)
1491	{
1492	if (!param->primary_path)
1493	return -EINVAL;
1494
1495	if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC &&
1496	param->qp_type != IB_QPT_XRC_INI)
1497	return -EINVAL;
1498
1499	if (param->private_data &&
1500	param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
1501	return -EINVAL;
1502
1503	if (param->alternate_path &&
1504	(param->alternate_path->pkey != param->primary_path->pkey ||
1505	param->alternate_path->mtu != param->primary_path->mtu))
1506	return -EINVAL;
1507
1508	return 0;
1509	}
1510
1511	int ib_send_cm_req(struct ib_cm_id *cm_id,
1512	struct ib_cm_req_param *param)
1513	{
1514	struct cm_av av = {}, alt_av = {};
1515	struct cm_id_private *cm_id_priv;
1516	struct ib_mad_send_buf *msg;
1517	struct cm_req_msg *req_msg;
1518	unsigned long flags;
1519	int ret;
1520
1521	ret = cm_validate_req_param(param);
1522	if (ret)
1523	return ret;
1524
1525	/* Verify that we're not in timewait. */
1526	cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1527	spin_lock_irqsave(&cm_id_priv->lock, flags);
1528	if (cm_id->state != IB_CM_IDLE || WARN_ON(cm_id_priv->timewait_info)) {
1529	spin_unlock_irqrestore(lock: &cm_id_priv->lock, flags);
1530	return -EINVAL;
1531	}
1532	spin_unlock_irqrestore(lock: &cm_id_priv->lock, flags);
1533
1534	cm_id_priv->timewait_info = cm_create_timewait_info(local_id: cm_id_priv->
1535	id.local_id);
1536	if (IS_ERR(ptr: cm_id_priv->timewait_info)) {
1537	ret = PTR_ERR(ptr: cm_id_priv->timewait_info);
1538	cm_id_priv->timewait_info = NULL;
1539	return ret;
1540	}
1541
1542	ret = cm_init_av_by_path(path: param->primary_path,
1543	sgid_attr: param->ppath_sgid_attr, av: &av);
1544	if (ret)
1545	return ret;
1546	if (param->alternate_path) {
1547	ret = cm_init_av_by_path(path: param->alternate_path, NULL,
1548	av: &alt_av);
1549	if (ret) {
1550	cm_destroy_av(av: &av);
1551	return ret;
1552	}
1553	}
1554	cm_id->service_id = param->service_id;
1555	cm_id_priv->timeout_ms = cm_convert_to_ms(
1556	iba_time: param->primary_path->packet_life_time) * 2 +
1557	cm_convert_to_ms(
1558	iba_time: param->remote_cm_response_timeout);
1559	cm_id_priv->max_cm_retries = param->max_cm_retries;
1560	cm_id_priv->initiator_depth = param->initiator_depth;
1561	cm_id_priv->responder_resources = param->responder_resources;
1562	cm_id_priv->retry_count = param->retry_count;
1563	cm_id_priv->path_mtu = param->primary_path->mtu;
1564	cm_id_priv->pkey = param->primary_path->pkey;
1565	cm_id_priv->qp_type = param->qp_type;
1566
1567	spin_lock_irqsave(&cm_id_priv->lock, flags);
1568
1569	cm_move_av_from_path(dest: &cm_id_priv->av, src: &av);
1570	if (param->primary_path_outbound)
1571	cm_id_priv->av.dlid_datapath =
1572	be16_to_cpu(param->primary_path_outbound->ib.dlid);
1573
1574	if (param->alternate_path)
1575	cm_move_av_from_path(dest: &cm_id_priv->alt_av, src: &alt_av);
1576
1577	msg = cm_alloc_priv_msg(cm_id_priv, state: IB_CM_REQ_SENT);
1578	if (IS_ERR(ptr: msg)) {
1579	ret = PTR_ERR(ptr: msg);
1580	goto out_unlock;
1581	}
1582
1583	req_msg = (struct cm_req_msg *)msg->mad;
1584	cm_format_req(req_msg, cm_id_priv, param);
1585	cm_id_priv->tid = req_msg->hdr.tid;
1586
1587	cm_id_priv->local_qpn = cpu_to_be32(IBA_GET(CM_REQ_LOCAL_QPN, req_msg));
1588	cm_id_priv->rq_psn = cpu_to_be32(IBA_GET(CM_REQ_STARTING_PSN, req_msg));
1589
1590	trace_icm_send_req(cm_id: &cm_id_priv->id);
1591	ret = ib_post_send_mad(send_buf: msg, NULL);
1592	if (ret)
1593	goto out_free;
1594	BUG_ON(cm_id->state != IB_CM_IDLE);
1595	cm_id->state = IB_CM_REQ_SENT;
1596	spin_unlock_irqrestore(lock: &cm_id_priv->lock, flags);
1597	return 0;
1598	out_free:
1599	cm_free_priv_msg(msg);
1600	out_unlock:
1601	spin_unlock_irqrestore(lock: &cm_id_priv->lock, flags);
1602	return ret;
1603	}
1604	EXPORT_SYMBOL(ib_send_cm_req);
1605
1606	static int cm_issue_rej(struct cm_port *port,
1607	struct ib_mad_recv_wc *mad_recv_wc,
1608	enum ib_cm_rej_reason reason,
1609	enum cm_msg_response msg_rejected,
1610	void *ari, u8 ari_length)
1611	{
1612	struct ib_mad_send_buf *msg = NULL;
1613	struct cm_rej_msg *rej_msg, *rcv_msg;
1614	int ret;
1615
1616	ret = cm_alloc_response_msg(port, mad_recv_wc, direct_retry: false, msg: &msg);
1617	if (ret)
1618	return ret;
1619
1620	/* We just need common CM header information. Cast to any message. */
1621	rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1622	rej_msg = (struct cm_rej_msg *) msg->mad;
1623
1624	cm_format_mad_hdr(hdr: &rej_msg->hdr, CM_REJ_ATTR_ID, tid: rcv_msg->hdr.tid);
1625	IBA_SET(CM_REJ_REMOTE_COMM_ID, rej_msg,
1626	IBA_GET(CM_REJ_LOCAL_COMM_ID, rcv_msg));
1627	IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg,
1628	IBA_GET(CM_REJ_REMOTE_COMM_ID, rcv_msg));
1629	IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, msg_rejected);
1630	IBA_SET(CM_REJ_REASON, rej_msg, reason);
1631
1632	if (ari && ari_length) {
1633	IBA_SET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg, ari_length);
1634	IBA_SET_MEM(CM_REJ_ARI, rej_msg, ari, ari_length);
1635	}
1636
1637	trace_icm_issue_rej(
1638	IBA_GET(CM_REJ_LOCAL_COMM_ID, rcv_msg),
1639	IBA_GET(CM_REJ_REMOTE_COMM_ID, rcv_msg));
1640	ret = ib_post_send_mad(send_buf: msg, NULL);
1641	if (ret)
1642	cm_free_msg(msg);
1643
1644	return ret;
1645	}
1646
1647	static bool cm_req_has_alt_path(struct cm_req_msg *req_msg)
1648	{
1649	return ((cpu_to_be16(
1650	IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg))) ||
1651	(ib_is_opa_gid(IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID,
1652	req_msg))));
1653	}
1654
1655	static void cm_path_set_rec_type(struct ib_device *ib_device, u32 port_num,
1656	struct sa_path_rec *path, union ib_gid *gid)
1657	{
1658	if (ib_is_opa_gid(gid) && rdma_cap_opa_ah(device: ib_device, port_num))
1659	path->rec_type = SA_PATH_REC_TYPE_OPA;
1660	else
1661	path->rec_type = SA_PATH_REC_TYPE_IB;
1662	}
1663
1664	static void cm_format_path_lid_from_req(struct cm_req_msg *req_msg,
1665	struct sa_path_rec *primary_path,
1666	struct sa_path_rec *alt_path,
1667	struct ib_wc *wc)
1668	{
1669	u32 lid;
1670
1671	if (primary_path->rec_type != SA_PATH_REC_TYPE_OPA) {
1672	sa_path_set_dlid(rec: primary_path, dlid: wc->slid);
1673	sa_path_set_slid(rec: primary_path,
1674	IBA_GET(CM_REQ_PRIMARY_REMOTE_PORT_LID,
1675	req_msg));
1676	} else {
1677	lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
1678	CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg));
1679	sa_path_set_dlid(rec: primary_path, dlid: lid);
1680
1681	lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
1682	CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg));
1683	sa_path_set_slid(rec: primary_path, slid: lid);
1684	}
1685
1686	if (!cm_req_has_alt_path(req_msg))
1687	return;
1688
1689	if (alt_path->rec_type != SA_PATH_REC_TYPE_OPA) {
1690	sa_path_set_dlid(rec: alt_path,
1691	IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID,
1692	req_msg));
1693	sa_path_set_slid(rec: alt_path,
1694	IBA_GET(CM_REQ_ALTERNATE_REMOTE_PORT_LID,
1695	req_msg));
1696	} else {
1697	lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
1698	CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg));
1699	sa_path_set_dlid(rec: alt_path, dlid: lid);
1700
1701	lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
1702	CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg));
1703	sa_path_set_slid(rec: alt_path, slid: lid);
1704	}
1705	}
1706
1707	static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1708	struct sa_path_rec *primary_path,
1709	struct sa_path_rec *alt_path,
1710	struct ib_wc *wc)
1711	{
1712	primary_path->dgid =
1713	*IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg);
1714	primary_path->sgid =
1715	*IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg);
1716	primary_path->flow_label =
1717	cpu_to_be32(IBA_GET(CM_REQ_PRIMARY_FLOW_LABEL, req_msg));
1718	primary_path->hop_limit = IBA_GET(CM_REQ_PRIMARY_HOP_LIMIT, req_msg);
1719	primary_path->traffic_class =
1720	IBA_GET(CM_REQ_PRIMARY_TRAFFIC_CLASS, req_msg);
1721	primary_path->reversible = 1;
1722	primary_path->pkey =
1723	cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg));
1724	primary_path->sl = IBA_GET(CM_REQ_PRIMARY_SL, req_msg);
1725	primary_path->mtu_selector = IB_SA_EQ;
1726	primary_path->mtu = IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg);
1727	primary_path->rate_selector = IB_SA_EQ;
1728	primary_path->rate = IBA_GET(CM_REQ_PRIMARY_PACKET_RATE, req_msg);
1729	primary_path->packet_life_time_selector = IB_SA_EQ;
1730	primary_path->packet_life_time =
1731	IBA_GET(CM_REQ_PRIMARY_LOCAL_ACK_TIMEOUT, req_msg);
1732	primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1733	primary_path->service_id =
1734	cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg));
1735	if (sa_path_is_roce(rec: primary_path))
1736	primary_path->roce.route_resolved = false;
1737
1738	if (cm_req_has_alt_path(req_msg)) {
1739	alt_path->dgid = *IBA_GET_MEM_PTR(
1740	CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg);
1741	alt_path->sgid = *IBA_GET_MEM_PTR(
1742	CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg);
1743	alt_path->flow_label = cpu_to_be32(
1744	IBA_GET(CM_REQ_ALTERNATE_FLOW_LABEL, req_msg));
1745	alt_path->hop_limit =
1746	IBA_GET(CM_REQ_ALTERNATE_HOP_LIMIT, req_msg);
1747	alt_path->traffic_class =
1748	IBA_GET(CM_REQ_ALTERNATE_TRAFFIC_CLASS, req_msg);
1749	alt_path->reversible = 1;
1750	alt_path->pkey =
1751	cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg));
1752	alt_path->sl = IBA_GET(CM_REQ_ALTERNATE_SL, req_msg);
1753	alt_path->mtu_selector = IB_SA_EQ;
1754	alt_path->mtu =
1755	IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg);
1756	alt_path->rate_selector = IB_SA_EQ;
1757	alt_path->rate = IBA_GET(CM_REQ_ALTERNATE_PACKET_RATE, req_msg);
1758	alt_path->packet_life_time_selector = IB_SA_EQ;
1759	alt_path->packet_life_time =
1760	IBA_GET(CM_REQ_ALTERNATE_LOCAL_ACK_TIMEOUT, req_msg);
1761	alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1762	alt_path->service_id =
1763	cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg));
1764
1765	if (sa_path_is_roce(rec: alt_path))
1766	alt_path->roce.route_resolved = false;
1767	}
1768	cm_format_path_lid_from_req(req_msg, primary_path, alt_path, wc);
1769	}
1770
1771	static u16 cm_get_bth_pkey(struct cm_work *work)
1772	{
1773	struct ib_device *ib_dev = work->port->cm_dev->ib_device;
1774	u32 port_num = work->port->port_num;
1775	u16 pkey_index = work->mad_recv_wc->wc->pkey_index;
1776	u16 pkey;
1777	int ret;
1778
1779	ret = ib_get_cached_pkey(device_handle: ib_dev, port_num, index: pkey_index, pkey: &pkey);
1780	if (ret) {
1781	dev_warn_ratelimited(&ib_dev->dev, "ib_cm: Couldn't retrieve pkey for incoming request (port %u, pkey index %u). %d\n",
1782	port_num, pkey_index, ret);
1783	return 0;
1784	}
1785
1786	return pkey;
1787	}
1788
1789	/**
1790	* cm_opa_to_ib_sgid - Convert OPA SGID to IB SGID
1791	* ULPs (such as IPoIB) do not understand OPA GIDs and will
1792	* reject them as the local_gid will not match the sgid. Therefore,
1793	* change the pathrec's SGID to an IB SGID.
1794	*
1795	* @work: Work completion
1796	* @path: Path record
1797	*/
1798	static void cm_opa_to_ib_sgid(struct cm_work *work,
1799	struct sa_path_rec *path)
1800	{
1801	struct ib_device *dev = work->port->cm_dev->ib_device;
1802	u32 port_num = work->port->port_num;
1803
1804	if (rdma_cap_opa_ah(device: dev, port_num) &&
1805	(ib_is_opa_gid(gid: &path->sgid))) {
1806	union ib_gid sgid;
1807
1808	if (rdma_query_gid(device: dev, port_num, index: 0, gid: &sgid)) {
1809	dev_warn(&dev->dev,
1810	"Error updating sgid in CM request\n");
1811	return;
1812	}
1813
1814	path->sgid = sgid;
1815	}
1816	}
1817
1818	static void cm_format_req_event(struct cm_work *work,
1819	struct cm_id_private *cm_id_priv,
1820	struct ib_cm_id *listen_id)
1821	{
1822	struct cm_req_msg *req_msg;
1823	struct ib_cm_req_event_param *param;
1824
1825	req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1826	param = &work->cm_event.param.req_rcvd;
1827	param->listen_id = listen_id;
1828	param->bth_pkey = cm_get_bth_pkey(work);
1829	param->port = cm_id_priv->av.port->port_num;
1830	param->primary_path = &work->path[0];
1831	cm_opa_to_ib_sgid(work, path: param->primary_path);
1832	if (cm_req_has_alt_path(req_msg)) {
1833	param->alternate_path = &work->path[1];
1834	cm_opa_to_ib_sgid(work, path: param->alternate_path);
1835	} else {
1836	param->alternate_path = NULL;
1837	}
1838	param->remote_ca_guid =
1839	cpu_to_be64(IBA_GET(CM_REQ_LOCAL_CA_GUID, req_msg));
1840	param->remote_qkey = IBA_GET(CM_REQ_LOCAL_Q_KEY, req_msg);
1841	param->remote_qpn = IBA_GET(CM_REQ_LOCAL_QPN, req_msg);
1842	param->qp_type = cm_req_get_qp_type(req_msg);
1843	param->starting_psn = IBA_GET(CM_REQ_STARTING_PSN, req_msg);
1844	param->responder_resources = IBA_GET(CM_REQ_INITIATOR_DEPTH, req_msg);
1845	param->initiator_depth = IBA_GET(CM_REQ_RESPONDER_RESOURCES, req_msg);
1846	param->local_cm_response_timeout =
1847	IBA_GET(CM_REQ_REMOTE_CM_RESPONSE_TIMEOUT, req_msg);
1848	param->flow_control = IBA_GET(CM_REQ_END_TO_END_FLOW_CONTROL, req_msg);
1849	param->remote_cm_response_timeout =
1850	IBA_GET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg);
1851	param->retry_count = IBA_GET(CM_REQ_RETRY_COUNT, req_msg);
1852	param->rnr_retry_count = IBA_GET(CM_REQ_RNR_RETRY_COUNT, req_msg);
1853	param->srq = IBA_GET(CM_REQ_SRQ, req_msg);
1854	param->ppath_sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr;
1855	param->ece.vendor_id = IBA_GET(CM_REQ_VENDOR_ID, req_msg);
1856	param->ece.attr_mod = be32_to_cpu(req_msg->hdr.attr_mod);
1857
1858	work->cm_event.private_data =
1859	IBA_GET_MEM_PTR(CM_REQ_PRIVATE_DATA, req_msg);
1860	}
1861
1862	static void cm_process_work(struct cm_id_private *cm_id_priv,
1863	struct cm_work *work)
1864	{
1865	int ret;
1866
1867	/* We will typically only have the current event to report. */
1868	ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1869	cm_free_work(work);
1870
1871	while (!ret && !atomic_add_negative(i: -1, v: &cm_id_priv->work_count)) {
1872	spin_lock_irq(lock: &cm_id_priv->lock);
1873	work = cm_dequeue_work(cm_id_priv);
1874	spin_unlock_irq(lock: &cm_id_priv->lock);
1875	if (!work)
1876	return;
1877
1878	ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1879	&work->cm_event);
1880	cm_free_work(work);
1881	}
1882	cm_deref_id(cm_id_priv);
1883	if (ret)
1884	cm_destroy_id(cm_id: &cm_id_priv->id, err: ret);
1885	}
1886
1887	static void cm_format_mra(struct cm_mra_msg *mra_msg,
1888	struct cm_id_private *cm_id_priv,
1889	enum cm_msg_response msg_mraed,
1890	const void *private_data, u8 private_data_len)
1891	{
1892	cm_format_mad_hdr(hdr: &mra_msg->hdr, CM_MRA_ATTR_ID, tid: cm_id_priv->tid);
1893	IBA_SET(CM_MRA_MESSAGE_MRAED, mra_msg, msg_mraed);
1894	IBA_SET(CM_MRA_LOCAL_COMM_ID, mra_msg,
1895	be32_to_cpu(cm_id_priv->id.local_id));
1896	IBA_SET(CM_MRA_REMOTE_COMM_ID, mra_msg,
1897	be32_to_cpu(cm_id_priv->id.remote_id));
1898	IBA_SET(CM_MRA_SERVICE_TIMEOUT, mra_msg, CM_MRA_SETTING);
1899
1900	if (private_data && private_data_len)
1901	IBA_SET_MEM(CM_MRA_PRIVATE_DATA, mra_msg, private_data,
1902	private_data_len);
1903	}
1904
1905	static void cm_format_rej(struct cm_rej_msg *rej_msg,
1906	struct cm_id_private *cm_id_priv,
1907	enum ib_cm_rej_reason reason, void *ari,
1908	u8 ari_length, const void *private_data,
1909	u8 private_data_len, enum ib_cm_state state)
1910	{
1911	lockdep_assert_held(&cm_id_priv->lock);
1912
1913	cm_format_mad_hdr(hdr: &rej_msg->hdr, CM_REJ_ATTR_ID, tid: cm_id_priv->tid);
1914	IBA_SET(CM_REJ_REMOTE_COMM_ID, rej_msg,
1915	be32_to_cpu(cm_id_priv->id.remote_id));
1916
1917	switch (state) {
1918	case IB_CM_REQ_RCVD:
1919	IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, be32_to_cpu(0));
1920	IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REQ);
1921	break;
1922	case IB_CM_MRA_REQ_SENT:
1923	IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg,
1924	be32_to_cpu(cm_id_priv->id.local_id));
1925	IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REQ);
1926	break;
1927	case IB_CM_REP_RCVD:
1928	case IB_CM_MRA_REP_SENT:
1929	IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg,
1930	be32_to_cpu(cm_id_priv->id.local_id));
1931	IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REP);
1932	break;
1933	default:
1934	IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg,
1935	be32_to_cpu(cm_id_priv->id.local_id));
1936	IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg,
1937	CM_MSG_RESPONSE_OTHER);
1938	break;
1939	}
1940
1941	IBA_SET(CM_REJ_REASON, rej_msg, reason);
1942	if (ari && ari_length) {
1943	IBA_SET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg, ari_length);
1944	IBA_SET_MEM(CM_REJ_ARI, rej_msg, ari, ari_length);
1945	}
1946
1947	if (private_data && private_data_len)
1948	IBA_SET_MEM(CM_REJ_PRIVATE_DATA, rej_msg, private_data,
1949	private_data_len);
1950	}
1951
1952	static void cm_dup_req_handler(struct cm_work *work,
1953	struct cm_id_private *cm_id_priv)
1954	{
1955	struct ib_mad_send_buf *msg = NULL;
1956	int ret;
1957
1958	atomic_long_inc(
1959	v: &work->port->counters[CM_RECV_DUPLICATES][CM_REQ_COUNTER]);
1960
1961	/* Quick state check to discard duplicate REQs. */
1962	spin_lock_irq(lock: &cm_id_priv->lock);
1963	if (cm_id_priv->id.state == IB_CM_REQ_RCVD) {
1964	spin_unlock_irq(lock: &cm_id_priv->lock);
1965	return;
1966	}
1967	spin_unlock_irq(lock: &cm_id_priv->lock);
1968
1969	ret = cm_alloc_response_msg(port: work->port, mad_recv_wc: work->mad_recv_wc, direct_retry: true, msg: &msg);
1970	if (ret)
1971	return;
1972
1973	spin_lock_irq(lock: &cm_id_priv->lock);
1974	switch (cm_id_priv->id.state) {
1975	case IB_CM_MRA_REQ_SENT:
1976	cm_format_mra(mra_msg: (struct cm_mra_msg *) msg->mad, cm_id_priv,
1977	msg_mraed: CM_MSG_RESPONSE_REQ,
1978	private_data: cm_id_priv->private_data,
1979	private_data_len: cm_id_priv->private_data_len);
1980	break;
1981	case IB_CM_TIMEWAIT:
1982	cm_format_rej(rej_msg: (struct cm_rej_msg *)msg->mad, cm_id_priv,
1983	reason: IB_CM_REJ_STALE_CONN, NULL, ari_length: 0, NULL, private_data_len: 0,
1984	state: IB_CM_TIMEWAIT);
1985	break;
1986	default:
1987	goto unlock;
1988	}
1989	spin_unlock_irq(lock: &cm_id_priv->lock);
1990
1991	trace_icm_send_dup_req(cm_id: &cm_id_priv->id);
1992	ret = ib_post_send_mad(send_buf: msg, NULL);
1993	if (ret)
1994	goto free;
1995	return;
1996
1997	unlock: spin_unlock_irq(lock: &cm_id_priv->lock);
1998	free: cm_free_msg(msg);
1999	}
2000
2001	static struct cm_id_private *cm_match_req(struct cm_work *work,
2002	struct cm_id_private *cm_id_priv)
2003	{
2004	struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
2005	struct cm_timewait_info *timewait_info;
2006	struct cm_req_msg *req_msg;
2007
2008	req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
2009
2010	/* Check for possible duplicate REQ. */
2011	spin_lock_irq(lock: &cm.lock);
2012	timewait_info = cm_insert_remote_id(timewait_info: cm_id_priv->timewait_info);
2013	if (timewait_info) {
2014	cur_cm_id_priv = cm_acquire_id(local_id: timewait_info->work.local_id,
2015	remote_id: timewait_info->work.remote_id);
2016	spin_unlock_irq(lock: &cm.lock);
2017	if (cur_cm_id_priv) {
2018	cm_dup_req_handler(work, cm_id_priv: cur_cm_id_priv);
2019	cm_deref_id(cm_id_priv: cur_cm_id_priv);
2020	}
2021	return NULL;
2022	}
2023
2024	/* Check for stale connections. */
2025	timewait_info = cm_insert_remote_qpn(timewait_info: cm_id_priv->timewait_info);
2026	if (timewait_info) {
2027	cm_remove_remote(cm_id_priv);
2028	cur_cm_id_priv = cm_acquire_id(local_id: timewait_info->work.local_id,
2029	remote_id: timewait_info->work.remote_id);
2030
2031	spin_unlock_irq(lock: &cm.lock);
2032	cm_issue_rej(port: work->port, mad_recv_wc: work->mad_recv_wc,
2033	reason: IB_CM_REJ_STALE_CONN, msg_rejected: CM_MSG_RESPONSE_REQ,
2034	NULL, ari_length: 0);
2035	if (cur_cm_id_priv) {
2036	ib_send_cm_dreq(cm_id: &cur_cm_id_priv->id, NULL, private_data_len: 0);
2037	cm_deref_id(cm_id_priv: cur_cm_id_priv);
2038	}
2039	return NULL;
2040	}
2041
2042	/* Find matching listen request. */
2043	listen_cm_id_priv = cm_find_listen(
2044	device: cm_id_priv->id.device,
2045	cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg)));
2046	if (!listen_cm_id_priv) {
2047	cm_remove_remote(cm_id_priv);
2048	spin_unlock_irq(lock: &cm.lock);
2049	cm_issue_rej(port: work->port, mad_recv_wc: work->mad_recv_wc,
2050	reason: IB_CM_REJ_INVALID_SERVICE_ID, msg_rejected: CM_MSG_RESPONSE_REQ,
2051	NULL, ari_length: 0);
2052	return NULL;
2053	}
2054	spin_unlock_irq(lock: &cm.lock);
2055	return listen_cm_id_priv;
2056	}
2057
2058	/*
2059	* Work-around for inter-subnet connections. If the LIDs are permissive,
2060	* we need to override the LID/SL data in the REQ with the LID information
2061	* in the work completion.
2062	*/
2063	static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc)
2064	{
2065	if (!IBA_GET(CM_REQ_PRIMARY_SUBNET_LOCAL, req_msg)) {
2066	if (cpu_to_be16(IBA_GET(CM_REQ_PRIMARY_LOCAL_PORT_LID,
2067	req_msg)) == IB_LID_PERMISSIVE) {
2068	IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg,
2069	be16_to_cpu(ib_lid_be16(wc->slid)));
2070	IBA_SET(CM_REQ_PRIMARY_SL, req_msg, wc->sl);
2071	}
2072
2073	if (cpu_to_be16(IBA_GET(CM_REQ_PRIMARY_REMOTE_PORT_LID,
2074	req_msg)) == IB_LID_PERMISSIVE)
2075	IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg,
2076	wc->dlid_path_bits);
2077	}
2078
2079	if (!IBA_GET(CM_REQ_ALTERNATE_SUBNET_LOCAL, req_msg)) {
2080	if (cpu_to_be16(IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID,
2081	req_msg)) == IB_LID_PERMISSIVE) {
2082	IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg,
2083	be16_to_cpu(ib_lid_be16(wc->slid)));
2084	IBA_SET(CM_REQ_ALTERNATE_SL, req_msg, wc->sl);
2085	}
2086
2087	if (cpu_to_be16(IBA_GET(CM_REQ_ALTERNATE_REMOTE_PORT_LID,
2088	req_msg)) == IB_LID_PERMISSIVE)
2089	IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg,
2090	wc->dlid_path_bits);
2091	}
2092	}
2093
2094	static int cm_req_handler(struct cm_work *work)
2095	{
2096	struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
2097	struct cm_req_msg *req_msg;
2098	const struct ib_global_route *grh;
2099	const struct ib_gid_attr *gid_attr;
2100	int ret;
2101
2102	req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
2103
2104	cm_id_priv =
2105	cm_alloc_id_priv(device: work->port->cm_dev->ib_device, NULL, NULL);
2106	if (IS_ERR(ptr: cm_id_priv))
2107	return PTR_ERR(ptr: cm_id_priv);
2108
2109	cm_id_priv->id.remote_id =
2110	cpu_to_be32(IBA_GET(CM_REQ_LOCAL_COMM_ID, req_msg));
2111	cm_id_priv->id.service_id =
2112	cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg));
2113	cm_id_priv->tid = req_msg->hdr.tid;
2114	cm_id_priv->timeout_ms = cm_convert_to_ms(
2115	IBA_GET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg));
2116	cm_id_priv->max_cm_retries = IBA_GET(CM_REQ_MAX_CM_RETRIES, req_msg);
2117	cm_id_priv->remote_qpn =
2118	cpu_to_be32(IBA_GET(CM_REQ_LOCAL_QPN, req_msg));
2119	cm_id_priv->initiator_depth =
2120	IBA_GET(CM_REQ_RESPONDER_RESOURCES, req_msg);
2121	cm_id_priv->responder_resources =
2122	IBA_GET(CM_REQ_INITIATOR_DEPTH, req_msg);
2123	cm_id_priv->path_mtu = IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg);
2124	cm_id_priv->pkey = cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg));
2125	cm_id_priv->sq_psn = cpu_to_be32(IBA_GET(CM_REQ_STARTING_PSN, req_msg));
2126	cm_id_priv->retry_count = IBA_GET(CM_REQ_RETRY_COUNT, req_msg);
2127	cm_id_priv->rnr_retry_count = IBA_GET(CM_REQ_RNR_RETRY_COUNT, req_msg);
2128	cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
2129
2130	ret = cm_init_av_for_response(port: work->port, wc: work->mad_recv_wc->wc,
2131	grh: work->mad_recv_wc->recv_buf.grh,
2132	av: &cm_id_priv->av);
2133	if (ret)
2134	goto destroy;
2135	cm_id_priv->timewait_info = cm_create_timewait_info(local_id: cm_id_priv->
2136	id.local_id);
2137	if (IS_ERR(ptr: cm_id_priv->timewait_info)) {
2138	ret = PTR_ERR(ptr: cm_id_priv->timewait_info);
2139	cm_id_priv->timewait_info = NULL;
2140	goto destroy;
2141	}
2142	cm_id_priv->timewait_info->work.remote_id = cm_id_priv->id.remote_id;
2143	cm_id_priv->timewait_info->remote_ca_guid =
2144	cpu_to_be64(IBA_GET(CM_REQ_LOCAL_CA_GUID, req_msg));
2145	cm_id_priv->timewait_info->remote_qpn = cm_id_priv->remote_qpn;
2146
2147	/*
2148	* Note that the ID pointer is not in the xarray at this point,
2149	* so this set is only visible to the local thread.
2150	*/
2151	cm_id_priv->id.state = IB_CM_REQ_RCVD;
2152
2153	listen_cm_id_priv = cm_match_req(work, cm_id_priv);
2154	if (!listen_cm_id_priv) {
2155	trace_icm_no_listener_err(cm_id: &cm_id_priv->id);
2156	cm_id_priv->id.state = IB_CM_IDLE;
2157	ret = -EINVAL;
2158	goto destroy;
2159	}
2160
2161	memset(&work->path[0], 0, sizeof(work->path[0]));
2162	if (cm_req_has_alt_path(req_msg))
2163	memset(&work->path[1], 0, sizeof(work->path[1]));
2164	grh = rdma_ah_read_grh(attr: &cm_id_priv->av.ah_attr);
2165	gid_attr = grh->sgid_attr;
2166
2167	if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_ROCE) {
2168	work->path[0].rec_type =
2169	sa_conv_gid_to_pathrec_type(type: gid_attr->gid_type);
2170	} else {
2171	cm_process_routed_req(req_msg, wc: work->mad_recv_wc->wc);
2172	cm_path_set_rec_type(
2173	ib_device: work->port->cm_dev->ib_device, port_num: work->port->port_num,
2174	path: &work->path[0],
2175	IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID,
2176	req_msg));
2177	}
2178	if (cm_req_has_alt_path(req_msg))
2179	work->path[1].rec_type = work->path[0].rec_type;
2180	cm_format_paths_from_req(req_msg, primary_path: &work->path[0],
2181	alt_path: &work->path[1], wc: work->mad_recv_wc->wc);
2182	if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_ROCE)
2183	sa_path_set_dmac(rec: &work->path[0],
2184	dmac: cm_id_priv->av.ah_attr.roce.dmac);
2185	work->path[0].hop_limit = grh->hop_limit;
2186
2187	/* This destroy call is needed to pair with cm_init_av_for_response */
2188	cm_destroy_av(av: &cm_id_priv->av);
2189	ret = cm_init_av_by_path(path: &work->path[0], sgid_attr: gid_attr, av: &cm_id_priv->av);
2190	if (ret) {
2191	int err;
2192
2193	err = rdma_query_gid(device: work->port->cm_dev->ib_device,
2194	port_num: work->port->port_num, index: 0,
2195	gid: &work->path[0].sgid);
2196	if (err)
2197	ib_send_cm_rej(cm_id: &cm_id_priv->id, reason: IB_CM_REJ_INVALID_GID,
2198	NULL, ari_length: 0, NULL, private_data_len: 0);
2199	else
2200	ib_send_cm_rej(cm_id: &cm_id_priv->id, reason: IB_CM_REJ_INVALID_GID,
2201	ari: &work->path[0].sgid,
2202	ari_length: sizeof(work->path[0].sgid),
2203	NULL, private_data_len: 0);
2204	goto rejected;
2205	}
2206	if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_IB)
2207	cm_id_priv->av.dlid_datapath =
2208	IBA_GET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg);
2209
2210	if (cm_req_has_alt_path(req_msg)) {
2211	ret = cm_init_av_by_path(path: &work->path[1], NULL,
2212	av: &cm_id_priv->alt_av);
2213	if (ret) {
2214	ib_send_cm_rej(cm_id: &cm_id_priv->id,
2215	reason: IB_CM_REJ_INVALID_ALT_GID,
2216	ari: &work->path[0].sgid,
2217	ari_length: sizeof(work->path[0].sgid), NULL, private_data_len: 0);
2218	goto rejected;
2219	}
2220	}
2221
2222	cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
2223	cm_id_priv->id.context = listen_cm_id_priv->id.context;
2224	cm_format_req_event(work, cm_id_priv, listen_id: &listen_cm_id_priv->id);
2225
2226	/* Now MAD handlers can see the new ID */
2227	spin_lock_irq(lock: &cm_id_priv->lock);
2228	cm_finalize_id(cm_id_priv);
2229
2230	/* Refcount belongs to the event, pairs with cm_process_work() */
2231	refcount_inc(r: &cm_id_priv->refcount);
2232	cm_queue_work_unlock(cm_id_priv, work);
2233	/*
2234	* Since this ID was just created and was not made visible to other MAD
2235	* handlers until the cm_finalize_id() above we know that the
2236	* cm_process_work() will deliver the event and the listen_cm_id
2237	* embedded in the event can be derefed here.
2238	*/
2239	cm_deref_id(cm_id_priv: listen_cm_id_priv);
2240	return 0;
2241
2242	rejected:
2243	cm_deref_id(cm_id_priv: listen_cm_id_priv);
2244	destroy:
2245	ib_destroy_cm_id(&cm_id_priv->id);
2246	return ret;
2247	}
2248
2249	static void cm_format_rep(struct cm_rep_msg *rep_msg,
2250	struct cm_id_private *cm_id_priv,
2251	struct ib_cm_rep_param *param)
2252	{
2253	cm_format_mad_ece_hdr(hdr: &rep_msg->hdr, CM_REP_ATTR_ID, tid: cm_id_priv->tid,
2254	attr_mod: param->ece.attr_mod);
2255	IBA_SET(CM_REP_LOCAL_COMM_ID, rep_msg,
2256	be32_to_cpu(cm_id_priv->id.local_id));
2257	IBA_SET(CM_REP_REMOTE_COMM_ID, rep_msg,
2258	be32_to_cpu(cm_id_priv->id.remote_id));
2259	IBA_SET(CM_REP_STARTING_PSN, rep_msg, param->starting_psn);
2260	IBA_SET(CM_REP_RESPONDER_RESOURCES, rep_msg,
2261	param->responder_resources);
2262	IBA_SET(CM_REP_TARGET_ACK_DELAY, rep_msg,
2263	cm_id_priv->av.port->cm_dev->ack_delay);
2264	IBA_SET(CM_REP_FAILOVER_ACCEPTED, rep_msg, param->failover_accepted);
2265	IBA_SET(CM_REP_RNR_RETRY_COUNT, rep_msg, param->rnr_retry_count);
2266	IBA_SET(CM_REP_LOCAL_CA_GUID, rep_msg,
2267	be64_to_cpu(cm_id_priv->id.device->node_guid));
2268
2269	if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) {
2270	IBA_SET(CM_REP_INITIATOR_DEPTH, rep_msg,
2271	param->initiator_depth);
2272	IBA_SET(CM_REP_END_TO_END_FLOW_CONTROL, rep_msg,
2273	param->flow_control);
2274	IBA_SET(CM_REP_SRQ, rep_msg, param->srq);
2275	IBA_SET(CM_REP_LOCAL_QPN, rep_msg, param->qp_num);
2276	} else {
2277	IBA_SET(CM_REP_SRQ, rep_msg, 1);
2278	IBA_SET(CM_REP_LOCAL_EE_CONTEXT_NUMBER, rep_msg, param->qp_num);
2279	}
2280
2281	IBA_SET(CM_REP_VENDOR_ID_L, rep_msg, param->ece.vendor_id);
2282	IBA_SET(CM_REP_VENDOR_ID_M, rep_msg, param->ece.vendor_id >> 8);
2283	IBA_SET(CM_REP_VENDOR_ID_H, rep_msg, param->ece.vendor_id >> 16);
2284
2285	if (param->private_data && param->private_data_len)
2286	IBA_SET_MEM(CM_REP_PRIVATE_DATA, rep_msg, param->private_data,
2287	param->private_data_len);
2288	}
2289
2290	int ib_send_cm_rep(struct ib_cm_id *cm_id,
2291	struct ib_cm_rep_param *param)
2292	{
2293	struct cm_id_private *cm_id_priv;
2294	struct ib_mad_send_buf *msg;
2295	struct cm_rep_msg *rep_msg;
2296	unsigned long flags;
2297	int ret;
2298
2299	if (param->private_data &&
2300	param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
2301	return -EINVAL;
2302
2303	cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2304	spin_lock_irqsave(&cm_id_priv->lock, flags);
2305	if (cm_id->state != IB_CM_REQ_RCVD &&
2306	cm_id->state != IB_CM_MRA_REQ_SENT) {
2307	trace_icm_send_rep_err(local_id: cm_id_priv->id.local_id, state: cm_id->state);
2308	ret = -EINVAL;
2309	goto out;
2310	}
2311
2312	msg = cm_alloc_priv_msg_rep(cm_id_priv, state: IB_CM_REP_SENT, rep_agent: true);
2313	if (IS_ERR(ptr: msg)) {
2314	ret = PTR_ERR(ptr: msg);
2315	goto out;
2316	}
2317
2318	rep_msg = (struct cm_rep_msg *) msg->mad;
2319	cm_format_rep(rep_msg, cm_id_priv, param);
2320
2321	trace_icm_send_rep(cm_id);
2322	ret = ib_post_send_mad(send_buf: msg, NULL);
2323	if (ret)
2324	goto out_free;
2325
2326	cm_id->state = IB_CM_REP_SENT;
2327	cm_id_priv->initiator_depth = param->initiator_depth;
2328	cm_id_priv->responder_resources = param->responder_resources;
2329	cm_id_priv->rq_psn = cpu_to_be32(IBA_GET(CM_REP_STARTING_PSN, rep_msg));
2330	WARN_ONCE(param->qp_num & 0xFF000000,
2331	"IBTA declares QPN to be 24 bits, but it is 0x%X\n",
2332	param->qp_num);
2333	cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF);
2334	spin_unlock_irqrestore(lock: &cm_id_priv->lock, flags);
2335	return 0;
2336
2337	out_free:
2338	cm_free_priv_msg(msg);
2339	out:
2340	spin_unlock_irqrestore(lock: &cm_id_priv->lock, flags);
2341	return ret;
2342	}
2343	EXPORT_SYMBOL(ib_send_cm_rep);
2344
2345	static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
2346	struct cm_id_private *cm_id_priv,
2347	const void *private_data,
2348	u8 private_data_len)
2349	{
2350	cm_format_mad_hdr(hdr: &rtu_msg->hdr, CM_RTU_ATTR_ID, tid: cm_id_priv->tid);
2351	IBA_SET(CM_RTU_LOCAL_COMM_ID, rtu_msg,
2352	be32_to_cpu(cm_id_priv->id.local_id));
2353	IBA_SET(CM_RTU_REMOTE_COMM_ID, rtu_msg,
2354	be32_to_cpu(cm_id_priv->id.remote_id));
2355
2356	if (private_data && private_data_len)
2357	IBA_SET_MEM(CM_RTU_PRIVATE_DATA, rtu_msg, private_data,
2358	private_data_len);
2359	}
2360
2361	int ib_send_cm_rtu(struct ib_cm_id *cm_id,
2362	const void *private_data,
2363	u8 private_data_len)
2364	{
2365	struct cm_id_private *cm_id_priv;
2366	struct ib_mad_send_buf *msg;
2367	unsigned long flags;
2368	void *data;
2369	int ret;
2370
2371	if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
2372	return -EINVAL;
2373
2374	data = cm_copy_private_data(private_data, private_data_len);
2375	if (IS_ERR(ptr: data))
2376	return PTR_ERR(ptr: data);
2377
2378	cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2379	spin_lock_irqsave(&cm_id_priv->lock, flags);
2380	if (cm_id->state != IB_CM_REP_RCVD &&
2381	cm_id->state != IB_CM_MRA_REP_SENT) {
2382	trace_icm_send_cm_rtu_err(cm_id);
2383	ret = -EINVAL;
2384	goto error;
2385	}
2386
2387	msg = cm_alloc_msg(cm_id_priv);
2388	if (IS_ERR(ptr: msg)) {
2389	ret = PTR_ERR(ptr: msg);
2390	goto error;
2391	}
2392
2393	cm_format_rtu(rtu_msg: (struct cm_rtu_msg *) msg->mad, cm_id_priv,
2394	private_data, private_data_len);
2395
2396	trace_icm_send_rtu(cm_id);
2397	ret = ib_post_send_mad(send_buf: msg, NULL);
2398	if (ret) {
2399	spin_unlock_irqrestore(lock: &cm_id_priv->lock, flags);
2400	cm_free_msg(msg);
2401	kfree(objp: data);
2402	return ret;
2403	}
2404
2405	cm_id->state = IB_CM_ESTABLISHED;
2406	cm_set_private_data(cm_id_priv, private_data: data, private_data_len);
2407	spin_unlock_irqrestore(lock: &cm_id_priv->lock, flags);
2408	return 0;
2409
2410	error: spin_unlock_irqrestore(lock: &cm_id_priv->lock, flags);
2411	kfree(objp: data);
2412	return ret;
2413	}
2414	EXPORT_SYMBOL(ib_send_cm_rtu);
2415
2416	static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type)
2417	{
2418	struct cm_rep_msg *rep_msg;
2419	struct ib_cm_rep_event_param *param;
2420
2421	rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
2422	param = &work->cm_event.param.rep_rcvd;
2423	param->remote_ca_guid =
2424	cpu_to_be64(IBA_GET(CM_REP_LOCAL_CA_GUID, rep_msg));
2425	param->remote_qkey = IBA_GET(CM_REP_LOCAL_Q_KEY, rep_msg);
2426	param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type));
2427	param->starting_psn = IBA_GET(CM_REP_STARTING_PSN, rep_msg);
2428	param->responder_resources = IBA_GET(CM_REP_INITIATOR_DEPTH, rep_msg);
2429	param->initiator_depth = IBA_GET(CM_REP_RESPONDER_RESOURCES, rep_msg);
2430	param->target_ack_delay = IBA_GET(CM_REP_TARGET_ACK_DELAY, rep_msg);
2431	param->failover_accepted = IBA_GET(CM_REP_FAILOVER_ACCEPTED, rep_msg);
2432	param->flow_control = IBA_GET(CM_REP_END_TO_END_FLOW_CONTROL, rep_msg);
2433	param->rnr_retry_count = IBA_GET(CM_REP_RNR_RETRY_COUNT, rep_msg);
2434	param->srq = IBA_GET(CM_REP_SRQ, rep_msg);
2435	param->ece.vendor_id = IBA_GET(CM_REP_VENDOR_ID_H, rep_msg) << 16;
2436	param->ece.vendor_id |= IBA_GET(CM_REP_VENDOR_ID_M, rep_msg) << 8;
2437	param->ece.vendor_id |= IBA_GET(CM_REP_VENDOR_ID_L, rep_msg);
2438	param->ece.attr_mod = be32_to_cpu(rep_msg->hdr.attr_mod);
2439
2440	work->cm_event.private_data =
2441	IBA_GET_MEM_PTR(CM_REP_PRIVATE_DATA, rep_msg);
2442	}
2443
2444	static void cm_dup_rep_handler(struct cm_work *work)
2445	{
2446	struct cm_id_private *cm_id_priv;
2447	struct cm_rep_msg *rep_msg;
2448	struct ib_mad_send_buf *msg = NULL;
2449	int ret;
2450
2451	rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
2452	cm_id_priv = cm_acquire_id(
2453	cpu_to_be32(IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)),
2454	cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg)));
2455	if (!cm_id_priv)
2456	return;
2457
2458	atomic_long_inc(
2459	v: &work->port->counters[CM_RECV_DUPLICATES][CM_REP_COUNTER]);
2460	ret = cm_alloc_response_msg(port: work->port, mad_recv_wc: work->mad_recv_wc, direct_retry: true, msg: &msg);
2461	if (ret)
2462	goto deref;
2463
2464	spin_lock_irq(lock: &cm_id_priv->lock);
2465	if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
2466	cm_format_rtu(rtu_msg: (struct cm_rtu_msg *) msg->mad, cm_id_priv,
2467	private_data: cm_id_priv->private_data,
2468	private_data_len: cm_id_priv->private_data_len);
2469	else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
2470	cm_format_mra(mra_msg: (struct cm_mra_msg *) msg->mad, cm_id_priv,
2471	msg_mraed: CM_MSG_RESPONSE_REP,
2472	private_data: cm_id_priv->private_data,
2473	private_data_len: cm_id_priv->private_data_len);
2474	else
2475	goto unlock;
2476	spin_unlock_irq(lock: &cm_id_priv->lock);
2477
2478	trace_icm_send_dup_rep(cm_id: &cm_id_priv->id);
2479	ret = ib_post_send_mad(send_buf: msg, NULL);
2480	if (ret)
2481	goto free;
2482	goto deref;
2483
2484	unlock: spin_unlock_irq(lock: &cm_id_priv->lock);
2485	free: cm_free_msg(msg);
2486	deref: cm_deref_id(cm_id_priv);
2487	}
2488
2489	static int cm_rep_handler(struct cm_work *work)
2490	{
2491	struct cm_id_private *cm_id_priv;
2492	struct cm_rep_msg *rep_msg;
2493	int ret;
2494	struct cm_id_private *cur_cm_id_priv;
2495	struct cm_timewait_info *timewait_info;
2496
2497	rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
2498	cm_id_priv = cm_acquire_id(
2499	cpu_to_be32(IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)), remote_id: 0);
2500	if (!cm_id_priv) {
2501	cm_dup_rep_handler(work);
2502	trace_icm_remote_no_priv_err(
2503	IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg));
2504	return -EINVAL;
2505	}
2506
2507	cm_format_rep_event(work, qp_type: cm_id_priv->qp_type);
2508
2509	spin_lock_irq(lock: &cm_id_priv->lock);
2510	switch (cm_id_priv->id.state) {
2511	case IB_CM_REQ_SENT:
2512	case IB_CM_MRA_REQ_RCVD:
2513	break;
2514	default:
2515	ret = -EINVAL;
2516	trace_icm_rep_unknown_err(
2517	IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg),
2518	IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg),
2519	state: cm_id_priv->id.state);
2520	spin_unlock_irq(lock: &cm_id_priv->lock);
2521	goto error;
2522	}
2523
2524	cm_id_priv->timewait_info->work.remote_id =
2525	cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg));
2526	cm_id_priv->timewait_info->remote_ca_guid =
2527	cpu_to_be64(IBA_GET(CM_REP_LOCAL_CA_GUID, rep_msg));
2528	cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, qp_type: cm_id_priv->qp_type);
2529
2530	spin_lock(lock: &cm.lock);
2531	/* Check for duplicate REP. */
2532	if (cm_insert_remote_id(timewait_info: cm_id_priv->timewait_info)) {
2533	spin_unlock(lock: &cm.lock);
2534	spin_unlock_irq(lock: &cm_id_priv->lock);
2535	ret = -EINVAL;
2536	trace_icm_insert_failed_err(
2537	IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg));
2538	goto error;
2539	}
2540	/* Check for a stale connection. */
2541	timewait_info = cm_insert_remote_qpn(timewait_info: cm_id_priv->timewait_info);
2542	if (timewait_info) {
2543	cm_remove_remote(cm_id_priv);
2544	cur_cm_id_priv = cm_acquire_id(local_id: timewait_info->work.local_id,
2545	remote_id: timewait_info->work.remote_id);
2546
2547	spin_unlock(lock: &cm.lock);
2548	spin_unlock_irq(lock: &cm_id_priv->lock);
2549	cm_issue_rej(port: work->port, mad_recv_wc: work->mad_recv_wc,
2550	reason: IB_CM_REJ_STALE_CONN, msg_rejected: CM_MSG_RESPONSE_REP,
2551	NULL, ari_length: 0);
2552	ret = -EINVAL;
2553	trace_icm_staleconn_err(
2554	IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg),
2555	IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg));
2556
2557	if (cur_cm_id_priv) {
2558	ib_send_cm_dreq(cm_id: &cur_cm_id_priv->id, NULL, private_data_len: 0);
2559	cm_deref_id(cm_id_priv: cur_cm_id_priv);
2560	}
2561
2562	goto error;
2563	}
2564	spin_unlock(lock: &cm.lock);
2565
2566	cm_id_priv->id.state = IB_CM_REP_RCVD;
2567	cm_id_priv->id.remote_id =
2568	cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg));
2569	cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, qp_type: cm_id_priv->qp_type);
2570	cm_id_priv->initiator_depth =
2571	IBA_GET(CM_REP_RESPONDER_RESOURCES, rep_msg);
2572	cm_id_priv->responder_resources =
2573	IBA_GET(CM_REP_INITIATOR_DEPTH, rep_msg);
2574	cm_id_priv->sq_psn = cpu_to_be32(IBA_GET(CM_REP_STARTING_PSN, rep_msg));
2575	cm_id_priv->rnr_retry_count = IBA_GET(CM_REP_RNR_RETRY_COUNT, rep_msg);
2576	cm_id_priv->target_ack_delay =
2577	IBA_GET(CM_REP_TARGET_ACK_DELAY, rep_msg);
2578	cm_id_priv->av.timeout =
2579	cm_ack_timeout(ca_ack_delay: cm_id_priv->target_ack_delay,
2580	packet_life_time: cm_id_priv->av.timeout - 1);
2581	cm_id_priv->alt_av.timeout =
2582	cm_ack_timeout(ca_ack_delay: cm_id_priv->target_ack_delay,
2583	packet_life_time: cm_id_priv->alt_av.timeout - 1);
2584
2585	ib_cancel_mad(send_buf: cm_id_priv->msg);
2586	cm_queue_work_unlock(cm_id_priv, work);
2587	return 0;
2588
2589	error:
2590	cm_deref_id(cm_id_priv);
2591	return ret;
2592	}
2593
2594	static int cm_establish_handler(struct cm_work *work)
2595	{
2596	struct cm_id_private *cm_id_priv;
2597
2598	/* See comment in cm_establish about lookup. */
2599	cm_id_priv = cm_acquire_id(local_id: work->local_id, remote_id: work->remote_id);
2600	if (!cm_id_priv)
2601	return -EINVAL;
2602
2603	spin_lock_irq(lock: &cm_id_priv->lock);
2604	if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
2605	spin_unlock_irq(lock: &cm_id_priv->lock);
2606	goto out;
2607	}
2608
2609	ib_cancel_mad(send_buf: cm_id_priv->msg);
2610	cm_queue_work_unlock(cm_id_priv, work);
2611	return 0;
2612	out:
2613	cm_deref_id(cm_id_priv);
2614	return -EINVAL;
2615	}
2616
2617	static int cm_rtu_handler(struct cm_work *work)
2618	{
2619	struct cm_id_private *cm_id_priv;
2620	struct cm_rtu_msg *rtu_msg;
2621
2622	rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
2623	cm_id_priv = cm_acquire_id(
2624	cpu_to_be32(IBA_GET(CM_RTU_REMOTE_COMM_ID, rtu_msg)),
2625	cpu_to_be32(IBA_GET(CM_RTU_LOCAL_COMM_ID, rtu_msg)));
2626	if (!cm_id_priv)
2627	return -EINVAL;
2628
2629	work->cm_event.private_data =
2630	IBA_GET_MEM_PTR(CM_RTU_PRIVATE_DATA, rtu_msg);
2631
2632	spin_lock_irq(lock: &cm_id_priv->lock);
2633	if (cm_id_priv->id.state != IB_CM_REP_SENT &&
2634	cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
2635	spin_unlock_irq(lock: &cm_id_priv->lock);
2636	atomic_long_inc(v: &work->port->counters[CM_RECV_DUPLICATES]
2637	[CM_RTU_COUNTER]);
2638	goto out;
2639	}
2640	cm_id_priv->id.state = IB_CM_ESTABLISHED;
2641
2642	ib_cancel_mad(send_buf: cm_id_priv->msg);
2643	cm_queue_work_unlock(cm_id_priv, work);
2644	return 0;
2645	out:
2646	cm_deref_id(cm_id_priv);
2647	return -EINVAL;
2648	}
2649
2650	static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
2651	struct cm_id_private *cm_id_priv,
2652	const void *private_data,
2653	u8 private_data_len)
2654	{
2655	cm_format_mad_hdr(hdr: &dreq_msg->hdr, CM_DREQ_ATTR_ID,
2656	tid: cm_form_tid(cm_id_priv));
2657	IBA_SET(CM_DREQ_LOCAL_COMM_ID, dreq_msg,
2658	be32_to_cpu(cm_id_priv->id.local_id));
2659	IBA_SET(CM_DREQ_REMOTE_COMM_ID, dreq_msg,
2660	be32_to_cpu(cm_id_priv->id.remote_id));
2661	IBA_SET(CM_DREQ_REMOTE_QPN_EECN, dreq_msg,
2662	be32_to_cpu(cm_id_priv->remote_qpn));
2663
2664	if (private_data && private_data_len)
2665	IBA_SET_MEM(CM_DREQ_PRIVATE_DATA, dreq_msg, private_data,
2666	private_data_len);
2667	}
2668
2669	static void cm_issue_dreq(struct cm_id_private *cm_id_priv)
2670	{
2671	struct ib_mad_send_buf *msg;
2672	int ret;
2673
2674	lockdep_assert_held(&cm_id_priv->lock);
2675
2676	msg = cm_alloc_msg(cm_id_priv);
2677	if (IS_ERR(ptr: msg))
2678	return;
2679
2680	cm_format_dreq(dreq_msg: (struct cm_dreq_msg *) msg->mad, cm_id_priv, NULL, private_data_len: 0);
2681
2682	trace_icm_send_dreq(cm_id: &cm_id_priv->id);
2683	ret = ib_post_send_mad(send_buf: msg, NULL);
2684	if (ret)
2685	cm_free_msg(msg);
2686	}
2687
2688	int ib_send_cm_dreq(struct ib_cm_id *cm_id, const void *private_data,
2689	u8 private_data_len)
2690	{
2691	struct cm_id_private *cm_id_priv =
2692	container_of(cm_id, struct cm_id_private, id);
2693	struct ib_mad_send_buf *msg;
2694	unsigned long flags;
2695	int ret;
2696
2697	if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
2698	return -EINVAL;
2699
2700	spin_lock_irqsave(&cm_id_priv->lock, flags);
2701	if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
2702	trace_icm_dreq_skipped(cm_id: &cm_id_priv->id);
2703	ret = -EINVAL;
2704	goto unlock;
2705	}
2706
2707	if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT ||
2708	cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2709	ib_cancel_mad(send_buf: cm_id_priv->msg);
2710
2711	msg = cm_alloc_priv_msg(cm_id_priv, state: IB_CM_DREQ_SENT);
2712	if (IS_ERR(ptr: msg)) {
2713	cm_enter_timewait(cm_id_priv);
2714	ret = PTR_ERR(ptr: msg);
2715	goto unlock;
2716	}
2717
2718	cm_format_dreq(dreq_msg: (struct cm_dreq_msg *) msg->mad, cm_id_priv,
2719	private_data, private_data_len);
2720
2721	trace_icm_send_dreq(cm_id: &cm_id_priv->id);
2722	ret = ib_post_send_mad(send_buf: msg, NULL);
2723	if (ret) {
2724	cm_enter_timewait(cm_id_priv);
2725	cm_free_priv_msg(msg);
2726	goto unlock;
2727	}
2728
2729	cm_id_priv->id.state = IB_CM_DREQ_SENT;
2730	unlock:
2731	spin_unlock_irqrestore(lock: &cm_id_priv->lock, flags);
2732	return ret;
2733	}
2734	EXPORT_SYMBOL(ib_send_cm_dreq);
2735
2736	static void cm_format_drep(struct cm_drep_msg *drep_msg,
2737	struct cm_id_private *cm_id_priv,
2738	const void *private_data,
2739	u8 private_data_len)
2740	{
2741	cm_format_mad_hdr(hdr: &drep_msg->hdr, CM_DREP_ATTR_ID, tid: cm_id_priv->tid);
2742	IBA_SET(CM_DREP_LOCAL_COMM_ID, drep_msg,
2743	be32_to_cpu(cm_id_priv->id.local_id));
2744	IBA_SET(CM_DREP_REMOTE_COMM_ID, drep_msg,
2745	be32_to_cpu(cm_id_priv->id.remote_id));
2746
2747	if (private_data && private_data_len)
2748	IBA_SET_MEM(CM_DREP_PRIVATE_DATA, drep_msg, private_data,
2749	private_data_len);
2750	}
2751
2752	static int cm_send_drep_locked(struct cm_id_private *cm_id_priv,
2753	void *private_data, u8 private_data_len)
2754	{
2755	struct ib_mad_send_buf *msg;
2756	int ret;
2757
2758	lockdep_assert_held(&cm_id_priv->lock);
2759
2760	if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
2761	return -EINVAL;
2762
2763	if (cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2764	trace_icm_send_drep_err(cm_id: &cm_id_priv->id);
2765	kfree(objp: private_data);
2766	return -EINVAL;
2767	}
2768
2769	cm_set_private_data(cm_id_priv, private_data, private_data_len);
2770	cm_enter_timewait(cm_id_priv);
2771
2772	msg = cm_alloc_msg(cm_id_priv);
2773	if (IS_ERR(ptr: msg))
2774	return PTR_ERR(ptr: msg);
2775
2776	cm_format_drep(drep_msg: (struct cm_drep_msg *) msg->mad, cm_id_priv,
2777	private_data, private_data_len);
2778
2779	trace_icm_send_drep(cm_id: &cm_id_priv->id);
2780	ret = ib_post_send_mad(send_buf: msg, NULL);
2781	if (ret) {
2782	cm_free_msg(msg);
2783	return ret;
2784	}
2785	return 0;
2786	}
2787
2788	int ib_send_cm_drep(struct ib_cm_id *cm_id, const void *private_data,
2789	u8 private_data_len)
2790	{
2791	struct cm_id_private *cm_id_priv =
2792	container_of(cm_id, struct cm_id_private, id);
2793	unsigned long flags;
2794	void *data;
2795	int ret;
2796
2797	data = cm_copy_private_data(private_data, private_data_len);
2798	if (IS_ERR(ptr: data))
2799	return PTR_ERR(ptr: data);
2800
2801	spin_lock_irqsave(&cm_id_priv->lock, flags);
2802	ret = cm_send_drep_locked(cm_id_priv, private_data: data, private_data_len);
2803	spin_unlock_irqrestore(lock: &cm_id_priv->lock, flags);
2804	return ret;
2805	}
2806	EXPORT_SYMBOL(ib_send_cm_drep);
2807
2808	static int cm_issue_drep(struct cm_port *port,
2809	struct ib_mad_recv_wc *mad_recv_wc)
2810	{
2811	struct ib_mad_send_buf *msg = NULL;
2812	struct cm_dreq_msg *dreq_msg;
2813	struct cm_drep_msg *drep_msg;
2814	int ret;
2815
2816	ret = cm_alloc_response_msg(port, mad_recv_wc, direct_retry: true, msg: &msg);
2817	if (ret)
2818	return ret;
2819
2820	dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad;
2821	drep_msg = (struct cm_drep_msg *) msg->mad;
2822
2823	cm_format_mad_hdr(hdr: &drep_msg->hdr, CM_DREP_ATTR_ID, tid: dreq_msg->hdr.tid);
2824	IBA_SET(CM_DREP_REMOTE_COMM_ID, drep_msg,
2825	IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg));
2826	IBA_SET(CM_DREP_LOCAL_COMM_ID, drep_msg,
2827	IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg));
2828
2829	trace_icm_issue_drep(
2830	IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg),
2831	IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg));
2832	ret = ib_post_send_mad(send_buf: msg, NULL);
2833	if (ret)
2834	cm_free_msg(msg);
2835
2836	return ret;
2837	}
2838
2839	static int cm_dreq_handler(struct cm_work *work)
2840	{
2841	struct cm_id_private *cm_id_priv;
2842	struct cm_dreq_msg *dreq_msg;
2843	struct ib_mad_send_buf *msg = NULL;
2844
2845	dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
2846	cm_id_priv = cm_acquire_id(
2847	cpu_to_be32(IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg)),
2848	cpu_to_be32(IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg)));
2849	if (!cm_id_priv) {
2850	atomic_long_inc(v: &work->port->counters[CM_RECV_DUPLICATES]
2851	[CM_DREQ_COUNTER]);
2852	cm_issue_drep(port: work->port, mad_recv_wc: work->mad_recv_wc);
2853	trace_icm_no_priv_err(
2854	IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg),
2855	IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg));
2856	return -EINVAL;
2857	}
2858
2859	work->cm_event.private_data =
2860	IBA_GET_MEM_PTR(CM_DREQ_PRIVATE_DATA, dreq_msg);
2861
2862	spin_lock_irq(lock: &cm_id_priv->lock);
2863	if (cm_id_priv->local_qpn !=
2864	cpu_to_be32(IBA_GET(CM_DREQ_REMOTE_QPN_EECN, dreq_msg)))
2865	goto unlock;
2866
2867	switch (cm_id_priv->id.state) {
2868	case IB_CM_REP_SENT:
2869	case IB_CM_DREQ_SENT:
2870	case IB_CM_MRA_REP_RCVD:
2871	ib_cancel_mad(send_buf: cm_id_priv->msg);
2872	break;
2873	case IB_CM_ESTABLISHED:
2874	if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT ||
2875	cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2876	ib_cancel_mad(send_buf: cm_id_priv->msg);
2877	break;
2878	case IB_CM_TIMEWAIT:
2879	atomic_long_inc(v: &work->port->counters[CM_RECV_DUPLICATES]
2880	[CM_DREQ_COUNTER]);
2881	msg = cm_alloc_response_msg_no_ah(port: work->port, mad_recv_wc: work->mad_recv_wc,
2882	direct_retry: true);
2883	if (IS_ERR(ptr: msg))
2884	goto unlock;
2885
2886	cm_format_drep(drep_msg: (struct cm_drep_msg *) msg->mad, cm_id_priv,
2887	private_data: cm_id_priv->private_data,
2888	private_data_len: cm_id_priv->private_data_len);
2889	spin_unlock_irq(lock: &cm_id_priv->lock);
2890
2891	if (cm_create_response_msg_ah(port: work->port, mad_recv_wc: work->mad_recv_wc, msg) ||
2892	ib_post_send_mad(send_buf: msg, NULL))
2893	cm_free_msg(msg);
2894	goto deref;
2895	case IB_CM_DREQ_RCVD:
2896	atomic_long_inc(v: &work->port->counters[CM_RECV_DUPLICATES]
2897	[CM_DREQ_COUNTER]);
2898	goto unlock;
2899	default:
2900	trace_icm_dreq_unknown_err(cm_id: &cm_id_priv->id);
2901	goto unlock;
2902	}
2903	cm_id_priv->id.state = IB_CM_DREQ_RCVD;
2904	cm_id_priv->tid = dreq_msg->hdr.tid;
2905	cm_queue_work_unlock(cm_id_priv, work);
2906	return 0;
2907
2908	unlock: spin_unlock_irq(lock: &cm_id_priv->lock);
2909	deref: cm_deref_id(cm_id_priv);
2910	return -EINVAL;
2911	}
2912
2913	static int cm_drep_handler(struct cm_work *work)
2914	{
2915	struct cm_id_private *cm_id_priv;
2916	struct cm_drep_msg *drep_msg;
2917
2918	drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
2919	cm_id_priv = cm_acquire_id(
2920	cpu_to_be32(IBA_GET(CM_DREP_REMOTE_COMM_ID, drep_msg)),
2921	cpu_to_be32(IBA_GET(CM_DREP_LOCAL_COMM_ID, drep_msg)));
2922	if (!cm_id_priv)
2923	return -EINVAL;
2924
2925	work->cm_event.private_data =
2926	IBA_GET_MEM_PTR(CM_DREP_PRIVATE_DATA, drep_msg);
2927
2928	spin_lock_irq(lock: &cm_id_priv->lock);
2929	if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
2930	cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2931	spin_unlock_irq(lock: &cm_id_priv->lock);
2932	goto out;
2933	}
2934	cm_enter_timewait(cm_id_priv);
2935
2936	ib_cancel_mad(send_buf: cm_id_priv->msg);
2937	cm_queue_work_unlock(cm_id_priv, work);
2938	return 0;
2939	out:
2940	cm_deref_id(cm_id_priv);
2941	return -EINVAL;
2942	}
2943
2944	static int cm_send_rej_locked(struct cm_id_private *cm_id_priv,
2945	enum ib_cm_rej_reason reason, void *ari,
2946	u8 ari_length, const void *private_data,
2947	u8 private_data_len)
2948	{
2949	enum ib_cm_state state = cm_id_priv->id.state;
2950	struct ib_mad_send_buf *msg;
2951	int ret;
2952
2953	lockdep_assert_held(&cm_id_priv->lock);
2954
2955	if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2956	(ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2957	return -EINVAL;
2958
2959	trace_icm_send_rej(cm_id: &cm_id_priv->id, reason);
2960
2961	switch (state) {
2962	case IB_CM_REQ_SENT:
2963	case IB_CM_MRA_REQ_RCVD:
2964	case IB_CM_REQ_RCVD:
2965	case IB_CM_MRA_REQ_SENT:
2966	case IB_CM_REP_RCVD:
2967	case IB_CM_MRA_REP_SENT:
2968	cm_reset_to_idle(cm_id_priv);
2969	msg = cm_alloc_msg(cm_id_priv);
2970	if (IS_ERR(ptr: msg))
2971	return PTR_ERR(ptr: msg);
2972	cm_format_rej(rej_msg: (struct cm_rej_msg *)msg->mad, cm_id_priv, reason,
2973	ari, ari_length, private_data, private_data_len,
2974	state);
2975	break;
2976	case IB_CM_REP_SENT:
2977	case IB_CM_MRA_REP_RCVD:
2978	cm_enter_timewait(cm_id_priv);
2979	msg = cm_alloc_msg(cm_id_priv);
2980	if (IS_ERR(ptr: msg))
2981	return PTR_ERR(ptr: msg);
2982	cm_format_rej(rej_msg: (struct cm_rej_msg *)msg->mad, cm_id_priv, reason,
2983	ari, ari_length, private_data, private_data_len,
2984	state);
2985	break;
2986	default:
2987	trace_icm_send_unknown_rej_err(cm_id: &cm_id_priv->id);
2988	return -EINVAL;
2989	}
2990
2991	ret = ib_post_send_mad(send_buf: msg, NULL);
2992	if (ret) {
2993	cm_free_msg(msg);
2994	return ret;
2995	}
2996
2997	return 0;
2998	}
2999
3000	int ib_send_cm_rej(struct ib_cm_id *cm_id, enum ib_cm_rej_reason reason,
3001	void *ari, u8 ari_length, const void *private_data,
3002	u8 private_data_len)
3003	{
3004	struct cm_id_private *cm_id_priv =
3005	container_of(cm_id, struct cm_id_private, id);
3006	unsigned long flags;
3007	int ret;
3008
3009	spin_lock_irqsave(&cm_id_priv->lock, flags);
3010	ret = cm_send_rej_locked(cm_id_priv, reason, ari, ari_length,
3011	private_data, private_data_len);
3012	spin_unlock_irqrestore(lock: &cm_id_priv->lock, flags);
3013	return ret;
3014	}
3015	EXPORT_SYMBOL(ib_send_cm_rej);
3016
3017	static void cm_format_rej_event(struct cm_work *work)
3018	{
3019	struct cm_rej_msg *rej_msg;
3020	struct ib_cm_rej_event_param *param;
3021
3022	rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
3023	param = &work->cm_event.param.rej_rcvd;
3024	param->ari = IBA_GET_MEM_PTR(CM_REJ_ARI, rej_msg);
3025	param->ari_length = IBA_GET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg);
3026	param->reason = IBA_GET(CM_REJ_REASON, rej_msg);
3027	work->cm_event.private_data =
3028	IBA_GET_MEM_PTR(CM_REJ_PRIVATE_DATA, rej_msg);
3029	}
3030
3031	static struct cm_id_private *cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
3032	{
3033	struct cm_id_private *cm_id_priv;
3034	__be32 remote_id;
3035
3036	remote_id = cpu_to_be32(IBA_GET(CM_REJ_LOCAL_COMM_ID, rej_msg));
3037
3038	if (IBA_GET(CM_REJ_REASON, rej_msg) == IB_CM_REJ_TIMEOUT) {
3039	cm_id_priv = cm_find_remote_id(
3040	remote_ca_guid: *((__be64 *)IBA_GET_MEM_PTR(CM_REJ_ARI, rej_msg)),
3041	remote_id);
3042	} else if (IBA_GET(CM_REJ_MESSAGE_REJECTED, rej_msg) ==
3043	CM_MSG_RESPONSE_REQ)
3044	cm_id_priv = cm_acquire_id(
3045	cpu_to_be32(IBA_GET(CM_REJ_REMOTE_COMM_ID, rej_msg)),
3046	remote_id: 0);
3047	else
3048	cm_id_priv = cm_acquire_id(
3049	cpu_to_be32(IBA_GET(CM_REJ_REMOTE_COMM_ID, rej_msg)),
3050	remote_id);
3051
3052	return cm_id_priv;
3053	}
3054
3055	static int cm_rej_handler(struct cm_work *work)
3056	{
3057	struct cm_id_private *cm_id_priv;
3058	struct cm_rej_msg *rej_msg;
3059
3060	rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
3061	cm_id_priv = cm_acquire_rejected_id(rej_msg);
3062	if (!cm_id_priv)
3063	return -EINVAL;
3064
3065	cm_format_rej_event(work);
3066
3067	spin_lock_irq(lock: &cm_id_priv->lock);
3068	switch (cm_id_priv->id.state) {
3069	case IB_CM_REQ_SENT:
3070	case IB_CM_MRA_REQ_RCVD:
3071	case IB_CM_REP_SENT:
3072	case IB_CM_MRA_REP_RCVD:
3073	ib_cancel_mad(send_buf: cm_id_priv->msg);
3074	fallthrough;
3075	case IB_CM_REQ_RCVD:
3076	case IB_CM_MRA_REQ_SENT:
3077	if (IBA_GET(CM_REJ_REASON, rej_msg) == IB_CM_REJ_STALE_CONN)
3078	cm_enter_timewait(cm_id_priv);
3079	else
3080	cm_reset_to_idle(cm_id_priv);
3081	break;
3082	case IB_CM_DREQ_SENT:
3083	ib_cancel_mad(send_buf: cm_id_priv->msg);
3084	fallthrough;
3085	case IB_CM_REP_RCVD:
3086	case IB_CM_MRA_REP_SENT:
3087	cm_enter_timewait(cm_id_priv);
3088	break;
3089	case IB_CM_ESTABLISHED:
3090	if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT ||
3091	cm_id_priv->id.lap_state == IB_CM_LAP_SENT) {
3092	if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT)
3093	ib_cancel_mad(send_buf: cm_id_priv->msg);
3094	cm_enter_timewait(cm_id_priv);
3095	break;
3096	}
3097	fallthrough;
3098	default:
3099	trace_icm_rej_unknown_err(cm_id: &cm_id_priv->id);
3100	spin_unlock_irq(lock: &cm_id_priv->lock);
3101	goto out;
3102	}
3103
3104	cm_queue_work_unlock(cm_id_priv, work);
3105	return 0;
3106	out:
3107	cm_deref_id(cm_id_priv);
3108	return -EINVAL;
3109	}
3110
3111	int ib_prepare_cm_mra(struct ib_cm_id *cm_id)
3112	{
3113	struct cm_id_private *cm_id_priv;
3114	enum ib_cm_state cm_state;
3115	enum ib_cm_lap_state lap_state;
3116	unsigned long flags;
3117	int ret = 0;
3118
3119	cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3120
3121	spin_lock_irqsave(&cm_id_priv->lock, flags);
3122	switch (cm_id_priv->id.state) {
3123	case IB_CM_REQ_RCVD:
3124	cm_state = IB_CM_MRA_REQ_SENT;
3125	lap_state = cm_id->lap_state;
3126	break;
3127	case IB_CM_REP_RCVD:
3128	cm_state = IB_CM_MRA_REP_SENT;
3129	lap_state = cm_id->lap_state;
3130	break;
3131	case IB_CM_ESTABLISHED:
3132	if (cm_id->lap_state == IB_CM_LAP_RCVD) {
3133	cm_state = cm_id->state;
3134	lap_state = IB_CM_MRA_LAP_SENT;
3135	break;
3136	}
3137	fallthrough;
3138	default:
3139	trace_icm_prepare_mra_unknown_err(cm_id: &cm_id_priv->id);
3140	ret = -EINVAL;
3141	goto error_unlock;
3142	}
3143
3144	cm_id->state = cm_state;
3145	cm_id->lap_state = lap_state;
3146	cm_set_private_data(cm_id_priv, NULL, private_data_len: 0);
3147
3148	error_unlock:
3149	spin_unlock_irqrestore(lock: &cm_id_priv->lock, flags);
3150	return ret;
3151	}
3152	EXPORT_SYMBOL(ib_prepare_cm_mra);
3153
3154	static struct cm_id_private *cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
3155	{
3156	switch (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg)) {
3157	case CM_MSG_RESPONSE_REQ:
3158	return cm_acquire_id(
3159	cpu_to_be32(IBA_GET(CM_MRA_REMOTE_COMM_ID, mra_msg)),
3160	remote_id: 0);
3161	case CM_MSG_RESPONSE_REP:
3162	case CM_MSG_RESPONSE_OTHER:
3163	return cm_acquire_id(
3164	cpu_to_be32(IBA_GET(CM_MRA_REMOTE_COMM_ID, mra_msg)),
3165	cpu_to_be32(IBA_GET(CM_MRA_LOCAL_COMM_ID, mra_msg)));
3166	default:
3167	return NULL;
3168	}
3169	}
3170
3171	static int cm_mra_handler(struct cm_work *work)
3172	{
3173	struct cm_id_private *cm_id_priv;
3174	struct cm_mra_msg *mra_msg;
3175	int timeout;
3176
3177	mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
3178	cm_id_priv = cm_acquire_mraed_id(mra_msg);
3179	if (!cm_id_priv)
3180	return -EINVAL;
3181
3182	work->cm_event.private_data =
3183	IBA_GET_MEM_PTR(CM_MRA_PRIVATE_DATA, mra_msg);
3184	work->cm_event.param.mra_rcvd.service_timeout =
3185	IBA_GET(CM_MRA_SERVICE_TIMEOUT, mra_msg);
3186	timeout = cm_convert_to_ms(IBA_GET(CM_MRA_SERVICE_TIMEOUT, mra_msg)) +
3187	cm_convert_to_ms(iba_time: cm_id_priv->av.timeout);
3188
3189	spin_lock_irq(lock: &cm_id_priv->lock);
3190	switch (cm_id_priv->id.state) {
3191	case IB_CM_REQ_SENT:
3192	if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) !=
3193	CM_MSG_RESPONSE_REQ ||
3194	ib_modify_mad(send_buf: cm_id_priv->msg, timeout_ms: timeout))
3195	goto out;
3196	cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
3197	break;
3198	case IB_CM_REP_SENT:
3199	if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) !=
3200	CM_MSG_RESPONSE_REP ||
3201	ib_modify_mad(send_buf: cm_id_priv->msg, timeout_ms: timeout))
3202	goto out;
3203	cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
3204	break;
3205	case IB_CM_ESTABLISHED:
3206	if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) !=
3207	CM_MSG_RESPONSE_OTHER ||
3208	cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
3209	ib_modify_mad(send_buf: cm_id_priv->msg, timeout_ms: timeout)) {
3210	if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
3211	atomic_long_inc(
3212	v: &work->port->counters[CM_RECV_DUPLICATES]
3213	[CM_MRA_COUNTER]);
3214	goto out;
3215	}
3216	cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
3217	break;
3218	case IB_CM_MRA_REQ_RCVD:
3219	case IB_CM_MRA_REP_RCVD:
3220	atomic_long_inc(v: &work->port->counters[CM_RECV_DUPLICATES]
3221	[CM_MRA_COUNTER]);
3222	fallthrough;
3223	default:
3224	trace_icm_mra_unknown_err(cm_id: &cm_id_priv->id);
3225	goto out;
3226	}
3227
3228	cm_id_priv->msg->context[1] = (void *) (unsigned long)
3229	cm_id_priv->id.state;
3230	cm_queue_work_unlock(cm_id_priv, work);
3231	return 0;
3232	out:
3233	spin_unlock_irq(lock: &cm_id_priv->lock);
3234	cm_deref_id(cm_id_priv);
3235	return -EINVAL;
3236	}
3237
3238	static void cm_format_path_lid_from_lap(struct cm_lap_msg *lap_msg,
3239	struct sa_path_rec *path)
3240	{
3241	u32 lid;
3242
3243	if (path->rec_type != SA_PATH_REC_TYPE_OPA) {
3244	sa_path_set_dlid(rec: path, IBA_GET(CM_LAP_ALTERNATE_LOCAL_PORT_LID,
3245	lap_msg));
3246	sa_path_set_slid(rec: path, IBA_GET(CM_LAP_ALTERNATE_REMOTE_PORT_LID,
3247	lap_msg));
3248	} else {
3249	lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
3250	CM_LAP_ALTERNATE_LOCAL_PORT_GID, lap_msg));
3251	sa_path_set_dlid(rec: path, dlid: lid);
3252
3253	lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
3254	CM_LAP_ALTERNATE_REMOTE_PORT_GID, lap_msg));
3255	sa_path_set_slid(rec: path, slid: lid);
3256	}
3257	}
3258
3259	static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv,
3260	struct sa_path_rec *path,
3261	struct cm_lap_msg *lap_msg)
3262	{
3263	path->dgid = *IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_LOCAL_PORT_GID, lap_msg);
3264	path->sgid =
3265	*IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_REMOTE_PORT_GID, lap_msg);
3266	path->flow_label =
3267	cpu_to_be32(IBA_GET(CM_LAP_ALTERNATE_FLOW_LABEL, lap_msg));
3268	path->hop_limit = IBA_GET(CM_LAP_ALTERNATE_HOP_LIMIT, lap_msg);
3269	path->traffic_class = IBA_GET(CM_LAP_ALTERNATE_TRAFFIC_CLASS, lap_msg);
3270	path->reversible = 1;
3271	path->pkey = cm_id_priv->pkey;
3272	path->sl = IBA_GET(CM_LAP_ALTERNATE_SL, lap_msg);
3273	path->mtu_selector = IB_SA_EQ;
3274	path->mtu = cm_id_priv->path_mtu;
3275	path->rate_selector = IB_SA_EQ;
3276	path->rate = IBA_GET(CM_LAP_ALTERNATE_PACKET_RATE, lap_msg);
3277	path->packet_life_time_selector = IB_SA_EQ;
3278	path->packet_life_time =
3279	IBA_GET(CM_LAP_ALTERNATE_LOCAL_ACK_TIMEOUT, lap_msg);
3280	path->packet_life_time -= (path->packet_life_time > 0);
3281	cm_format_path_lid_from_lap(lap_msg, path);
3282	}
3283
3284	static int cm_lap_handler(struct cm_work *work)
3285	{
3286	struct cm_id_private *cm_id_priv;
3287	struct cm_lap_msg *lap_msg;
3288	struct ib_cm_lap_event_param *param;
3289	struct ib_mad_send_buf *msg = NULL;
3290	struct rdma_ah_attr ah_attr;
3291	struct cm_av alt_av = {};
3292	int ret;
3293
3294	/* Currently Alternate path messages are not supported for
3295	* RoCE link layer.
3296	*/
3297	if (rdma_protocol_roce(device: work->port->cm_dev->ib_device,
3298	port_num: work->port->port_num))
3299	return -EINVAL;
3300
3301	/* todo: verify LAP request and send reject APR if invalid. */
3302	lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
3303	cm_id_priv = cm_acquire_id(
3304	cpu_to_be32(IBA_GET(CM_LAP_REMOTE_COMM_ID, lap_msg)),
3305	cpu_to_be32(IBA_GET(CM_LAP_LOCAL_COMM_ID, lap_msg)));
3306	if (!cm_id_priv)
3307	return -EINVAL;
3308
3309	param = &work->cm_event.param.lap_rcvd;
3310	memset(&work->path[0], 0, sizeof(work->path[1]));
3311	cm_path_set_rec_type(ib_device: work->port->cm_dev->ib_device,
3312	port_num: work->port->port_num, path: &work->path[0],
3313	IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_LOCAL_PORT_GID,
3314	lap_msg));
3315	param->alternate_path = &work->path[0];
3316	cm_format_path_from_lap(cm_id_priv, path: param->alternate_path, lap_msg);
3317	work->cm_event.private_data =
3318	IBA_GET_MEM_PTR(CM_LAP_PRIVATE_DATA, lap_msg);
3319
3320	ret = ib_init_ah_attr_from_wc(device: work->port->cm_dev->ib_device,
3321	port_num: work->port->port_num,
3322	wc: work->mad_recv_wc->wc,
3323	grh: work->mad_recv_wc->recv_buf.grh,
3324	ah_attr: &ah_attr);
3325	if (ret)
3326	goto deref;
3327
3328	ret = cm_init_av_by_path(path: param->alternate_path, NULL, av: &alt_av);
3329	if (ret) {
3330	rdma_destroy_ah_attr(ah_attr: &ah_attr);
3331	goto deref;
3332	}
3333
3334	spin_lock_irq(lock: &cm_id_priv->lock);
3335	cm_init_av_for_lap(port: work->port, wc: work->mad_recv_wc->wc,
3336	ah_attr: &ah_attr, av: &cm_id_priv->av);
3337	cm_move_av_from_path(dest: &cm_id_priv->alt_av, src: &alt_av);
3338
3339	if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
3340	goto unlock;
3341
3342	switch (cm_id_priv->id.lap_state) {
3343	case IB_CM_LAP_UNINIT:
3344	case IB_CM_LAP_IDLE:
3345	break;
3346	case IB_CM_MRA_LAP_SENT:
3347	atomic_long_inc(v: &work->port->counters[CM_RECV_DUPLICATES]
3348	[CM_LAP_COUNTER]);
3349	msg = cm_alloc_response_msg_no_ah(port: work->port, mad_recv_wc: work->mad_recv_wc,
3350	direct_retry: true);
3351	if (IS_ERR(ptr: msg))
3352	goto unlock;
3353
3354	cm_format_mra(mra_msg: (struct cm_mra_msg *) msg->mad, cm_id_priv,
3355	msg_mraed: CM_MSG_RESPONSE_OTHER,
3356	private_data: cm_id_priv->private_data,
3357	private_data_len: cm_id_priv->private_data_len);
3358	spin_unlock_irq(lock: &cm_id_priv->lock);
3359
3360	if (cm_create_response_msg_ah(port: work->port, mad_recv_wc: work->mad_recv_wc, msg) ||
3361	ib_post_send_mad(send_buf: msg, NULL))
3362	cm_free_msg(msg);
3363	goto deref;
3364	case IB_CM_LAP_RCVD:
3365	atomic_long_inc(v: &work->port->counters[CM_RECV_DUPLICATES]
3366	[CM_LAP_COUNTER]);
3367	goto unlock;
3368	default:
3369	goto unlock;
3370	}
3371
3372	cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
3373	cm_id_priv->tid = lap_msg->hdr.tid;
3374	cm_queue_work_unlock(cm_id_priv, work);
3375	return 0;
3376
3377	unlock: spin_unlock_irq(lock: &cm_id_priv->lock);
3378	deref: cm_deref_id(cm_id_priv);
3379	return -EINVAL;
3380	}
3381
3382	static int cm_apr_handler(struct cm_work *work)
3383	{
3384	struct cm_id_private *cm_id_priv;
3385	struct cm_apr_msg *apr_msg;
3386
3387	/* Currently Alternate path messages are not supported for
3388	* RoCE link layer.
3389	*/
3390	if (rdma_protocol_roce(device: work->port->cm_dev->ib_device,
3391	port_num: work->port->port_num))
3392	return -EINVAL;
3393
3394	apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
3395	cm_id_priv = cm_acquire_id(
3396	cpu_to_be32(IBA_GET(CM_APR_REMOTE_COMM_ID, apr_msg)),
3397	cpu_to_be32(IBA_GET(CM_APR_LOCAL_COMM_ID, apr_msg)));
3398	if (!cm_id_priv)
3399	return -EINVAL; /* Unmatched reply. */
3400
3401	work->cm_event.param.apr_rcvd.ap_status =
3402	IBA_GET(CM_APR_AR_STATUS, apr_msg);
3403	work->cm_event.param.apr_rcvd.apr_info =
3404	IBA_GET_MEM_PTR(CM_APR_ADDITIONAL_INFORMATION, apr_msg);
3405	work->cm_event.param.apr_rcvd.info_len =
3406	IBA_GET(CM_APR_ADDITIONAL_INFORMATION_LENGTH, apr_msg);
3407	work->cm_event.private_data =
3408	IBA_GET_MEM_PTR(CM_APR_PRIVATE_DATA, apr_msg);
3409
3410	spin_lock_irq(lock: &cm_id_priv->lock);
3411	if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
3412	(cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
3413	cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
3414	spin_unlock_irq(lock: &cm_id_priv->lock);
3415	goto out;
3416	}
3417	cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
3418	ib_cancel_mad(send_buf: cm_id_priv->msg);
3419	cm_queue_work_unlock(cm_id_priv, work);
3420	return 0;
3421	out:
3422	cm_deref_id(cm_id_priv);
3423	return -EINVAL;
3424	}
3425
3426	static int cm_timewait_handler(struct cm_work *work)
3427	{
3428	struct cm_timewait_info *timewait_info;
3429	struct cm_id_private *cm_id_priv;
3430
3431	timewait_info = container_of(work, struct cm_timewait_info, work);
3432	spin_lock_irq(lock: &cm.lock);
3433	list_del(entry: &timewait_info->list);
3434	spin_unlock_irq(lock: &cm.lock);
3435
3436	cm_id_priv = cm_acquire_id(local_id: timewait_info->work.local_id,
3437	remote_id: timewait_info->work.remote_id);
3438	if (!cm_id_priv)
3439	return -EINVAL;
3440
3441	spin_lock_irq(lock: &cm_id_priv->lock);
3442	if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
3443	cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
3444	spin_unlock_irq(lock: &cm_id_priv->lock);
3445	goto out;
3446	}
3447	cm_id_priv->id.state = IB_CM_IDLE;
3448	cm_queue_work_unlock(cm_id_priv, work);
3449	return 0;
3450	out:
3451	cm_deref_id(cm_id_priv);
3452	return -EINVAL;
3453	}
3454
3455	static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
3456	struct cm_id_private *cm_id_priv,
3457	struct ib_cm_sidr_req_param *param)
3458	{
3459	cm_format_mad_hdr(hdr: &sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
3460	tid: cm_form_tid(cm_id_priv));
3461	IBA_SET(CM_SIDR_REQ_REQUESTID, sidr_req_msg,
3462	be32_to_cpu(cm_id_priv->id.local_id));
3463	IBA_SET(CM_SIDR_REQ_PARTITION_KEY, sidr_req_msg,
3464	be16_to_cpu(param->path->pkey));
3465	IBA_SET(CM_SIDR_REQ_SERVICEID, sidr_req_msg,
3466	be64_to_cpu(param->service_id));
3467
3468	if (param->private_data && param->private_data_len)
3469	IBA_SET_MEM(CM_SIDR_REQ_PRIVATE_DATA, sidr_req_msg,
3470	param->private_data, param->private_data_len);
3471	}
3472
3473	int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
3474	struct ib_cm_sidr_req_param *param)
3475	{
3476	struct cm_id_private *cm_id_priv;
3477	struct ib_mad_send_buf *msg;
3478	struct cm_av av = {};
3479	unsigned long flags;
3480	int ret;
3481
3482	if (!param->path || (param->private_data &&
3483	param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
3484	return -EINVAL;
3485
3486	cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3487	ret = cm_init_av_by_path(path: param->path, sgid_attr: param->sgid_attr, av: &av);
3488	if (ret)
3489	return ret;
3490
3491	spin_lock_irqsave(&cm_id_priv->lock, flags);
3492	cm_move_av_from_path(dest: &cm_id_priv->av, src: &av);
3493	cm_id->service_id = param->service_id;
3494	cm_id_priv->timeout_ms = param->timeout_ms;
3495	cm_id_priv->max_cm_retries = param->max_cm_retries;
3496	if (cm_id->state != IB_CM_IDLE) {
3497	ret = -EINVAL;
3498	goto out_unlock;
3499	}
3500
3501	msg = cm_alloc_priv_msg(cm_id_priv, state: IB_CM_SIDR_REQ_SENT);
3502	if (IS_ERR(ptr: msg)) {
3503	ret = PTR_ERR(ptr: msg);
3504	goto out_unlock;
3505	}
3506
3507	cm_format_sidr_req(sidr_req_msg: (struct cm_sidr_req_msg *)msg->mad, cm_id_priv,
3508	param);
3509
3510	trace_icm_send_sidr_req(cm_id: &cm_id_priv->id);
3511	ret = ib_post_send_mad(send_buf: msg, NULL);
3512	if (ret)
3513	goto out_free;
3514	cm_id->state = IB_CM_SIDR_REQ_SENT;
3515	spin_unlock_irqrestore(lock: &cm_id_priv->lock, flags);
3516	return 0;
3517	out_free:
3518	cm_free_priv_msg(msg);
3519	out_unlock:
3520	spin_unlock_irqrestore(lock: &cm_id_priv->lock, flags);
3521	return ret;
3522	}
3523	EXPORT_SYMBOL(ib_send_cm_sidr_req);
3524
3525	static void cm_format_sidr_req_event(struct cm_work *work,
3526	const struct cm_id_private *rx_cm_id,
3527	struct ib_cm_id *listen_id)
3528	{
3529	struct cm_sidr_req_msg *sidr_req_msg;
3530	struct ib_cm_sidr_req_event_param *param;
3531
3532	sidr_req_msg = (struct cm_sidr_req_msg *)
3533	work->mad_recv_wc->recv_buf.mad;
3534	param = &work->cm_event.param.sidr_req_rcvd;
3535	param->pkey = IBA_GET(CM_SIDR_REQ_PARTITION_KEY, sidr_req_msg);
3536	param->listen_id = listen_id;
3537	param->service_id =
3538	cpu_to_be64(IBA_GET(CM_SIDR_REQ_SERVICEID, sidr_req_msg));
3539	param->bth_pkey = cm_get_bth_pkey(work);
3540	param->port = work->port->port_num;
3541	param->sgid_attr = rx_cm_id->av.ah_attr.grh.sgid_attr;
3542	work->cm_event.private_data =
3543	IBA_GET_MEM_PTR(CM_SIDR_REQ_PRIVATE_DATA, sidr_req_msg);
3544	}
3545
3546	static int cm_sidr_req_handler(struct cm_work *work)
3547	{
3548	struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
3549	struct cm_sidr_req_msg *sidr_req_msg;
3550	struct ib_wc *wc;
3551	int ret;
3552
3553	cm_id_priv =
3554	cm_alloc_id_priv(device: work->port->cm_dev->ib_device, NULL, NULL);
3555	if (IS_ERR(ptr: cm_id_priv))
3556	return PTR_ERR(ptr: cm_id_priv);
3557
3558	/* Record SGID/SLID and request ID for lookup. */
3559	sidr_req_msg = (struct cm_sidr_req_msg *)
3560	work->mad_recv_wc->recv_buf.mad;
3561
3562	cm_id_priv->id.remote_id =
3563	cpu_to_be32(IBA_GET(CM_SIDR_REQ_REQUESTID, sidr_req_msg));
3564	cm_id_priv->id.service_id =
3565	cpu_to_be64(IBA_GET(CM_SIDR_REQ_SERVICEID, sidr_req_msg));
3566	cm_id_priv->tid = sidr_req_msg->hdr.tid;
3567
3568	wc = work->mad_recv_wc->wc;
3569	cm_id_priv->sidr_slid = wc->slid;
3570	ret = cm_init_av_for_response(port: work->port, wc: work->mad_recv_wc->wc,
3571	grh: work->mad_recv_wc->recv_buf.grh,
3572	av: &cm_id_priv->av);
3573	if (ret)
3574	goto out;
3575
3576	spin_lock_irq(lock: &cm.lock);
3577	listen_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
3578	if (listen_cm_id_priv) {
3579	spin_unlock_irq(lock: &cm.lock);
3580	atomic_long_inc(v: &work->port->counters[CM_RECV_DUPLICATES]
3581	[CM_SIDR_REQ_COUNTER]);
3582	goto out; /* Duplicate message. */
3583	}
3584	cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
3585	listen_cm_id_priv = cm_find_listen(device: cm_id_priv->id.device,
3586	service_id: cm_id_priv->id.service_id);
3587	if (!listen_cm_id_priv) {
3588	spin_unlock_irq(lock: &cm.lock);
3589	ib_send_cm_sidr_rep(cm_id: &cm_id_priv->id,
3590	param: &(struct ib_cm_sidr_rep_param){
3591	.status = IB_SIDR_UNSUPPORTED });
3592	goto out; /* No match. */
3593	}
3594	spin_unlock_irq(lock: &cm.lock);
3595
3596	cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
3597	cm_id_priv->id.context = listen_cm_id_priv->id.context;
3598
3599	/*
3600	* A SIDR ID does not need to be in the xarray since it does not receive
3601	* mads, is not placed in the remote_id or remote_qpn rbtree, and does
3602	* not enter timewait.
3603	*/
3604
3605	cm_format_sidr_req_event(work, rx_cm_id: cm_id_priv, listen_id: &listen_cm_id_priv->id);
3606	ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
3607	cm_free_work(work);
3608	/*
3609	* A pointer to the listen_cm_id is held in the event, so this deref
3610	* must be after the event is delivered above.
3611	*/
3612	cm_deref_id(cm_id_priv: listen_cm_id_priv);
3613	if (ret)
3614	cm_destroy_id(cm_id: &cm_id_priv->id, err: ret);
3615	return 0;
3616	out:
3617	ib_destroy_cm_id(&cm_id_priv->id);
3618	return -EINVAL;
3619	}
3620
3621	static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
3622	struct cm_id_private *cm_id_priv,
3623	struct ib_cm_sidr_rep_param *param)
3624	{
3625	cm_format_mad_ece_hdr(hdr: &sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
3626	tid: cm_id_priv->tid, attr_mod: param->ece.attr_mod);
3627	IBA_SET(CM_SIDR_REP_REQUESTID, sidr_rep_msg,
3628	be32_to_cpu(cm_id_priv->id.remote_id));
3629	IBA_SET(CM_SIDR_REP_STATUS, sidr_rep_msg, param->status);
3630	IBA_SET(CM_SIDR_REP_QPN, sidr_rep_msg, param->qp_num);
3631	IBA_SET(CM_SIDR_REP_SERVICEID, sidr_rep_msg,
3632	be64_to_cpu(cm_id_priv->id.service_id));
3633	IBA_SET(CM_SIDR_REP_Q_KEY, sidr_rep_msg, param->qkey);
3634	IBA_SET(CM_SIDR_REP_VENDOR_ID_L, sidr_rep_msg,
3635	param->ece.vendor_id & 0xFF);
3636	IBA_SET(CM_SIDR_REP_VENDOR_ID_H, sidr_rep_msg,
3637	(param->ece.vendor_id >> 8) & 0xFF);
3638
3639	if (param->info && param->info_length)
3640	IBA_SET_MEM(CM_SIDR_REP_ADDITIONAL_INFORMATION, sidr_rep_msg,
3641	param->info, param->info_length);
3642
3643	if (param->private_data && param->private_data_len)
3644	IBA_SET_MEM(CM_SIDR_REP_PRIVATE_DATA, sidr_rep_msg,
3645	param->private_data, param->private_data_len);
3646	}
3647
3648	static int cm_send_sidr_rep_locked(struct cm_id_private *cm_id_priv,
3649	struct ib_cm_sidr_rep_param *param)
3650	{
3651	struct ib_mad_send_buf *msg;
3652	unsigned long flags;
3653	int ret;
3654
3655	lockdep_assert_held(&cm_id_priv->lock);
3656
3657	if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
3658	(param->private_data &&
3659	param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
3660	return -EINVAL;
3661
3662	if (cm_id_priv->id.state != IB_CM_SIDR_REQ_RCVD)
3663	return -EINVAL;
3664
3665	msg = cm_alloc_msg(cm_id_priv);
3666	if (IS_ERR(ptr: msg))
3667	return PTR_ERR(ptr: msg);
3668
3669	cm_format_sidr_rep(sidr_rep_msg: (struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
3670	param);
3671	trace_icm_send_sidr_rep(cm_id: &cm_id_priv->id);
3672	ret = ib_post_send_mad(send_buf: msg, NULL);
3673	if (ret) {
3674	cm_free_msg(msg);
3675	return ret;
3676	}
3677	cm_id_priv->id.state = IB_CM_IDLE;
3678	spin_lock_irqsave(&cm.lock, flags);
3679	if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) {
3680	rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
3681	RB_CLEAR_NODE(&cm_id_priv->sidr_id_node);
3682	}
3683	spin_unlock_irqrestore(lock: &cm.lock, flags);
3684	return 0;
3685	}
3686
3687	int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
3688	struct ib_cm_sidr_rep_param *param)
3689	{
3690	struct cm_id_private *cm_id_priv =
3691	container_of(cm_id, struct cm_id_private, id);
3692	unsigned long flags;
3693	int ret;
3694
3695	spin_lock_irqsave(&cm_id_priv->lock, flags);
3696	ret = cm_send_sidr_rep_locked(cm_id_priv, param);
3697	spin_unlock_irqrestore(lock: &cm_id_priv->lock, flags);
3698	return ret;
3699	}
3700	EXPORT_SYMBOL(ib_send_cm_sidr_rep);
3701
3702	static void cm_format_sidr_rep_event(struct cm_work *work,
3703	const struct cm_id_private *cm_id_priv)
3704	{
3705	struct cm_sidr_rep_msg *sidr_rep_msg;
3706	struct ib_cm_sidr_rep_event_param *param;
3707
3708	sidr_rep_msg = (struct cm_sidr_rep_msg *)
3709	work->mad_recv_wc->recv_buf.mad;
3710	param = &work->cm_event.param.sidr_rep_rcvd;
3711	param->status = IBA_GET(CM_SIDR_REP_STATUS, sidr_rep_msg);
3712	param->qkey = IBA_GET(CM_SIDR_REP_Q_KEY, sidr_rep_msg);
3713	param->qpn = IBA_GET(CM_SIDR_REP_QPN, sidr_rep_msg);
3714	param->info = IBA_GET_MEM_PTR(CM_SIDR_REP_ADDITIONAL_INFORMATION,
3715	sidr_rep_msg);
3716	param->info_len = IBA_GET(CM_SIDR_REP_ADDITIONAL_INFORMATION_LENGTH,
3717	sidr_rep_msg);
3718	param->sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr;
3719	work->cm_event.private_data =
3720	IBA_GET_MEM_PTR(CM_SIDR_REP_PRIVATE_DATA, sidr_rep_msg);
3721	}
3722
3723	static int cm_sidr_rep_handler(struct cm_work *work)
3724	{
3725	struct cm_sidr_rep_msg *sidr_rep_msg;
3726	struct cm_id_private *cm_id_priv;
3727
3728	sidr_rep_msg = (struct cm_sidr_rep_msg *)
3729	work->mad_recv_wc->recv_buf.mad;
3730	cm_id_priv = cm_acquire_id(
3731	cpu_to_be32(IBA_GET(CM_SIDR_REP_REQUESTID, sidr_rep_msg)), remote_id: 0);
3732	if (!cm_id_priv)
3733	return -EINVAL; /* Unmatched reply. */
3734
3735	spin_lock_irq(lock: &cm_id_priv->lock);
3736	if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
3737	spin_unlock_irq(lock: &cm_id_priv->lock);
3738	goto out;
3739	}
3740	cm_id_priv->id.state = IB_CM_IDLE;
3741	ib_cancel_mad(send_buf: cm_id_priv->msg);
3742	spin_unlock_irq(lock: &cm_id_priv->lock);
3743
3744	cm_format_sidr_rep_event(work, cm_id_priv);
3745	cm_process_work(cm_id_priv, work);
3746	return 0;
3747	out:
3748	cm_deref_id(cm_id_priv);
3749	return -EINVAL;
3750	}
3751
3752	static void cm_process_send_error(struct cm_id_private *cm_id_priv,
3753	struct ib_mad_send_buf *msg,
3754	enum ib_wc_status wc_status)
3755	{
3756	enum ib_cm_state state = (unsigned long) msg->context[1];
3757	struct ib_cm_event cm_event = {};
3758	int ret;
3759
3760	/* Discard old sends. */
3761	spin_lock_irq(lock: &cm_id_priv->lock);
3762	if (msg != cm_id_priv->msg) {
3763	spin_unlock_irq(lock: &cm_id_priv->lock);
3764	cm_free_msg(msg);
3765	cm_deref_id(cm_id_priv);
3766	return;
3767	}
3768	cm_free_priv_msg(msg);
3769
3770	if (state != cm_id_priv->id.state || wc_status == IB_WC_SUCCESS ||
3771	wc_status == IB_WC_WR_FLUSH_ERR)
3772	goto out_unlock;
3773
3774	trace_icm_mad_send_err(state, wc_status);
3775	switch (state) {
3776	case IB_CM_REQ_SENT:
3777	case IB_CM_MRA_REQ_RCVD:
3778	cm_reset_to_idle(cm_id_priv);
3779	cm_event.event = IB_CM_REQ_ERROR;
3780	break;
3781	case IB_CM_REP_SENT:
3782	case IB_CM_MRA_REP_RCVD:
3783	cm_reset_to_idle(cm_id_priv);
3784	cm_event.event = IB_CM_REP_ERROR;
3785	break;
3786	case IB_CM_DREQ_SENT:
3787	cm_enter_timewait(cm_id_priv);
3788	cm_event.event = IB_CM_DREQ_ERROR;
3789	break;
3790	case IB_CM_SIDR_REQ_SENT:
3791	cm_id_priv->id.state = IB_CM_IDLE;
3792	cm_event.event = IB_CM_SIDR_REQ_ERROR;
3793	break;
3794	default:
3795	goto out_unlock;
3796	}
3797	spin_unlock_irq(lock: &cm_id_priv->lock);
3798	cm_event.param.send_status = wc_status;
3799
3800	/* No other events can occur on the cm_id at this point. */
3801	ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
3802	if (ret)
3803	ib_destroy_cm_id(&cm_id_priv->id);
3804	return;
3805	out_unlock:
3806	spin_unlock_irq(lock: &cm_id_priv->lock);
3807	}
3808
3809	static void cm_send_handler(struct ib_mad_agent *mad_agent,
3810	struct ib_mad_send_wc *mad_send_wc)
3811	{
3812	struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
3813	struct cm_id_private *cm_id_priv;
3814	struct cm_port *port;
3815	u16 attr_index;
3816
3817	port = mad_agent->context;
3818	attr_index = be16_to_cpu(((struct ib_mad_hdr *)
3819	msg->mad)->attr_id) - CM_ATTR_ID_OFFSET;
3820
3821	if (msg->context[0] == CM_DIRECT_RETRY_CTX) {
3822	msg->retries = 1;
3823	cm_id_priv = NULL;
3824	} else {
3825	cm_id_priv = msg->context[0];
3826	}
3827
3828	atomic_long_add(i: 1 + msg->retries, v: &port->counters[CM_XMIT][attr_index]);
3829	if (msg->retries)
3830	atomic_long_add(i: msg->retries,
3831	v: &port->counters[CM_XMIT_RETRIES][attr_index]);
3832
3833	if (cm_id_priv)
3834	cm_process_send_error(cm_id_priv, msg, wc_status: mad_send_wc->status);
3835	else
3836	cm_free_msg(msg);
3837	}
3838
3839	static void cm_work_handler(struct work_struct *_work)
3840	{
3841	struct cm_work *work = container_of(_work, struct cm_work, work.work);
3842	int ret;
3843
3844	switch (work->cm_event.event) {
3845	case IB_CM_REQ_RECEIVED:
3846	ret = cm_req_handler(work);
3847	break;
3848	case IB_CM_MRA_RECEIVED:
3849	ret = cm_mra_handler(work);
3850	break;
3851	case IB_CM_REJ_RECEIVED:
3852	ret = cm_rej_handler(work);
3853	break;
3854	case IB_CM_REP_RECEIVED:
3855	ret = cm_rep_handler(work);
3856	break;
3857	case IB_CM_RTU_RECEIVED:
3858	ret = cm_rtu_handler(work);
3859	break;
3860	case IB_CM_USER_ESTABLISHED:
3861	ret = cm_establish_handler(work);
3862	break;
3863	case IB_CM_DREQ_RECEIVED:
3864	ret = cm_dreq_handler(work);
3865	break;
3866	case IB_CM_DREP_RECEIVED:
3867	ret = cm_drep_handler(work);
3868	break;
3869	case IB_CM_SIDR_REQ_RECEIVED:
3870	ret = cm_sidr_req_handler(work);
3871	break;
3872	case IB_CM_SIDR_REP_RECEIVED:
3873	ret = cm_sidr_rep_handler(work);
3874	break;
3875	case IB_CM_LAP_RECEIVED:
3876	ret = cm_lap_handler(work);
3877	break;
3878	case IB_CM_APR_RECEIVED:
3879	ret = cm_apr_handler(work);
3880	break;
3881	case IB_CM_TIMEWAIT_EXIT:
3882	ret = cm_timewait_handler(work);
3883	break;
3884	default:
3885	trace_icm_handler_err(event: work->cm_event.event);
3886	ret = -EINVAL;
3887	break;
3888	}
3889	if (ret)
3890	cm_free_work(work);
3891	}
3892
3893	static int cm_establish(struct ib_cm_id *cm_id)
3894	{
3895	struct cm_id_private *cm_id_priv;
3896	struct cm_work *work;
3897	unsigned long flags;
3898	int ret = 0;
3899	struct cm_device *cm_dev;
3900
3901	cm_dev = ib_get_client_data(device: cm_id->device, client: &cm_client);
3902	if (!cm_dev)
3903	return -ENODEV;
3904
3905	work = kmalloc(sizeof *work, GFP_ATOMIC);
3906	if (!work)
3907	return -ENOMEM;
3908
3909	cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3910	spin_lock_irqsave(&cm_id_priv->lock, flags);
3911	switch (cm_id->state) {
3912	case IB_CM_REP_SENT:
3913	case IB_CM_MRA_REP_RCVD:
3914	cm_id->state = IB_CM_ESTABLISHED;
3915	break;
3916	case IB_CM_ESTABLISHED:
3917	ret = -EISCONN;
3918	break;
3919	default:
3920	trace_icm_establish_err(cm_id);
3921	ret = -EINVAL;
3922	break;
3923	}
3924	spin_unlock_irqrestore(lock: &cm_id_priv->lock, flags);
3925
3926	if (ret) {
3927	kfree(objp: work);
3928	goto out;
3929	}
3930
3931	/*
3932	* The CM worker thread may try to destroy the cm_id before it
3933	* can execute this work item. To prevent potential deadlock,
3934	* we need to find the cm_id once we're in the context of the
3935	* worker thread, rather than holding a reference on it.
3936	*/
3937	INIT_DELAYED_WORK(&work->work, cm_work_handler);
3938	work->local_id = cm_id->local_id;
3939	work->remote_id = cm_id->remote_id;
3940	work->mad_recv_wc = NULL;
3941	work->cm_event.event = IB_CM_USER_ESTABLISHED;
3942
3943	/* Check if the device started its remove_one */
3944	spin_lock_irqsave(&cm.lock, flags);
3945	if (!cm_dev->going_down) {
3946	queue_delayed_work(wq: cm.wq, dwork: &work->work, delay: 0);
3947	} else {
3948	kfree(objp: work);
3949	ret = -ENODEV;
3950	}
3951	spin_unlock_irqrestore(lock: &cm.lock, flags);
3952
3953	out:
3954	return ret;
3955	}
3956
3957	static int cm_migrate(struct ib_cm_id *cm_id)
3958	{
3959	struct cm_id_private *cm_id_priv;
3960	unsigned long flags;
3961	int ret = 0;
3962
3963	cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3964	spin_lock_irqsave(&cm_id_priv->lock, flags);
3965	if (cm_id->state == IB_CM_ESTABLISHED &&
3966	(cm_id->lap_state == IB_CM_LAP_UNINIT ||
3967	cm_id->lap_state == IB_CM_LAP_IDLE)) {
3968	cm_id->lap_state = IB_CM_LAP_IDLE;
3969	cm_id_priv->av = cm_id_priv->alt_av;
3970	} else
3971	ret = -EINVAL;
3972	spin_unlock_irqrestore(lock: &cm_id_priv->lock, flags);
3973
3974	return ret;
3975	}
3976
3977	int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event)
3978	{
3979	int ret;
3980
3981	switch (event) {
3982	case IB_EVENT_COMM_EST:
3983	ret = cm_establish(cm_id);
3984	break;
3985	case IB_EVENT_PATH_MIG:
3986	ret = cm_migrate(cm_id);
3987	break;
3988	default:
3989	ret = -EINVAL;
3990	}
3991	return ret;
3992	}
3993	EXPORT_SYMBOL(ib_cm_notify);
3994
3995	static void cm_recv_handler(struct ib_mad_agent *mad_agent,
3996	struct ib_mad_send_buf *send_buf,
3997	struct ib_mad_recv_wc *mad_recv_wc)
3998	{
3999	struct cm_port *port = mad_agent->context;
4000	struct cm_work *work;
4001	enum ib_cm_event_type event;
4002	bool alt_path = false;
4003	u16 attr_id;
4004	int paths = 0;
4005	int going_down = 0;
4006
4007	switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
4008	case CM_REQ_ATTR_ID:
4009	alt_path = cm_req_has_alt_path(req_msg: (struct cm_req_msg *)
4010	mad_recv_wc->recv_buf.mad);
4011	paths = 1 + (alt_path != 0);
4012	event = IB_CM_REQ_RECEIVED;
4013	break;
4014	case CM_MRA_ATTR_ID:
4015	event = IB_CM_MRA_RECEIVED;
4016	break;
4017	case CM_REJ_ATTR_ID:
4018	event = IB_CM_REJ_RECEIVED;
4019	break;
4020	case CM_REP_ATTR_ID:
4021	event = IB_CM_REP_RECEIVED;
4022	break;
4023	case CM_RTU_ATTR_ID:
4024	event = IB_CM_RTU_RECEIVED;
4025	break;
4026	case CM_DREQ_ATTR_ID:
4027	event = IB_CM_DREQ_RECEIVED;
4028	break;
4029	case CM_DREP_ATTR_ID:
4030	event = IB_CM_DREP_RECEIVED;
4031	break;
4032	case CM_SIDR_REQ_ATTR_ID:
4033	event = IB_CM_SIDR_REQ_RECEIVED;
4034	break;
4035	case CM_SIDR_REP_ATTR_ID:
4036	event = IB_CM_SIDR_REP_RECEIVED;
4037	break;
4038	case CM_LAP_ATTR_ID:
4039	paths = 1;
4040	event = IB_CM_LAP_RECEIVED;
4041	break;
4042	case CM_APR_ATTR_ID:
4043	event = IB_CM_APR_RECEIVED;
4044	break;
4045	default:
4046	ib_free_recv_mad(mad_recv_wc);
4047	return;
4048	}
4049
4050	attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id);
4051	atomic_long_inc(v: &port->counters[CM_RECV][attr_id - CM_ATTR_ID_OFFSET]);
4052
4053	work = kmalloc(struct_size(work, path, paths), GFP_KERNEL);
4054	if (!work) {
4055	ib_free_recv_mad(mad_recv_wc);
4056	return;
4057	}
4058
4059	INIT_DELAYED_WORK(&work->work, cm_work_handler);
4060	work->cm_event.event = event;
4061	work->mad_recv_wc = mad_recv_wc;
4062	work->port = port;
4063
4064	/* Check if the device started its remove_one */
4065	spin_lock_irq(lock: &cm.lock);
4066	if (!port->cm_dev->going_down)
4067	queue_delayed_work(wq: cm.wq, dwork: &work->work, delay: 0);
4068	else
4069	going_down = 1;
4070	spin_unlock_irq(lock: &cm.lock);
4071
4072	if (going_down) {
4073	kfree(objp: work);
4074	ib_free_recv_mad(mad_recv_wc);
4075	}
4076	}
4077
4078	static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
4079	struct ib_qp_attr *qp_attr,
4080	int *qp_attr_mask)
4081	{
4082	unsigned long flags;
4083	int ret;
4084
4085	spin_lock_irqsave(&cm_id_priv->lock, flags);
4086	switch (cm_id_priv->id.state) {
4087	case IB_CM_REQ_SENT:
4088	case IB_CM_MRA_REQ_RCVD:
4089	case IB_CM_REQ_RCVD:
4090	case IB_CM_MRA_REQ_SENT:
4091	case IB_CM_REP_RCVD:
4092	case IB_CM_MRA_REP_SENT:
4093	case IB_CM_REP_SENT:
4094	case IB_CM_MRA_REP_RCVD:
4095	case IB_CM_ESTABLISHED:
4096	*qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
4097	IB_QP_PKEY_INDEX | IB_QP_PORT;
4098	qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE;
4099	if (cm_id_priv->responder_resources) {
4100	struct ib_device *ib_dev = cm_id_priv->id.device;
4101	u64 support_flush = ib_dev->attrs.device_cap_flags &
4102	(IB_DEVICE_FLUSH_GLOBAL | IB_DEVICE_FLUSH_PERSISTENT);
4103	u32 flushable = support_flush ?
4104	(IB_ACCESS_FLUSH_GLOBAL |
4105	IB_ACCESS_FLUSH_PERSISTENT) : 0;
4106
4107	qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
4108	IB_ACCESS_REMOTE_ATOMIC |
4109	flushable;
4110	}
4111	qp_attr->pkey_index = cm_id_priv->av.pkey_index;
4112	if (cm_id_priv->av.port)
4113	qp_attr->port_num = cm_id_priv->av.port->port_num;
4114	ret = 0;
4115	break;
4116	default:
4117	trace_icm_qp_init_err(cm_id: &cm_id_priv->id);
4118	ret = -EINVAL;
4119	break;
4120	}
4121	spin_unlock_irqrestore(lock: &cm_id_priv->lock, flags);
4122	return ret;
4123	}
4124
4125	static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
4126	struct ib_qp_attr *qp_attr,
4127	int *qp_attr_mask)
4128	{
4129	unsigned long flags;
4130	int ret;
4131
4132	spin_lock_irqsave(&cm_id_priv->lock, flags);
4133	switch (cm_id_priv->id.state) {
4134	case IB_CM_REQ_RCVD:
4135	case IB_CM_MRA_REQ_SENT:
4136	case IB_CM_REP_RCVD:
4137	case IB_CM_MRA_REP_SENT:
4138	case IB_CM_REP_SENT:
4139	case IB_CM_MRA_REP_RCVD:
4140	case IB_CM_ESTABLISHED:
4141	*qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
4142	IB_QP_DEST_QPN | IB_QP_RQ_PSN;
4143	qp_attr->ah_attr = cm_id_priv->av.ah_attr;
4144	if ((qp_attr->ah_attr.type == RDMA_AH_ATTR_TYPE_IB) &&
4145	cm_id_priv->av.dlid_datapath &&
4146	(cm_id_priv->av.dlid_datapath != 0xffff))
4147	qp_attr->ah_attr.ib.dlid = cm_id_priv->av.dlid_datapath;
4148	qp_attr->path_mtu = cm_id_priv->path_mtu;
4149	qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
4150	qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
4151	if (cm_id_priv->qp_type == IB_QPT_RC ||
4152	cm_id_priv->qp_type == IB_QPT_XRC_TGT) {
4153	*qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
4154	IB_QP_MIN_RNR_TIMER;
4155	qp_attr->max_dest_rd_atomic =
4156	cm_id_priv->responder_resources;
4157	qp_attr->min_rnr_timer = 0;
4158	}
4159	if (rdma_ah_get_dlid(attr: &cm_id_priv->alt_av.ah_attr) &&
4160	cm_id_priv->alt_av.port) {
4161	*qp_attr_mask |= IB_QP_ALT_PATH;
4162	qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
4163	qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
4164	qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
4165	qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
4166	}
4167	ret = 0;
4168	break;
4169	default:
4170	trace_icm_qp_rtr_err(cm_id: &cm_id_priv->id);
4171	ret = -EINVAL;
4172	break;
4173	}
4174	spin_unlock_irqrestore(lock: &cm_id_priv->lock, flags);
4175	return ret;
4176	}
4177
4178	static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
4179	struct ib_qp_attr *qp_attr,
4180	int *qp_attr_mask)
4181	{
4182	unsigned long flags;
4183	int ret;
4184
4185	spin_lock_irqsave(&cm_id_priv->lock, flags);
4186	switch (cm_id_priv->id.state) {
4187	/* Allow transition to RTS before sending REP */
4188	case IB_CM_REQ_RCVD:
4189	case IB_CM_MRA_REQ_SENT:
4190
4191	case IB_CM_REP_RCVD:
4192	case IB_CM_MRA_REP_SENT:
4193	case IB_CM_REP_SENT:
4194	case IB_CM_MRA_REP_RCVD:
4195	case IB_CM_ESTABLISHED:
4196	if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) {
4197	*qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
4198	qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
4199	switch (cm_id_priv->qp_type) {
4200	case IB_QPT_RC:
4201	case IB_QPT_XRC_INI:
4202	*qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY |
4203	IB_QP_MAX_QP_RD_ATOMIC;
4204	qp_attr->retry_cnt = cm_id_priv->retry_count;
4205	qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
4206	qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
4207	fallthrough;
4208	case IB_QPT_XRC_TGT:
4209	*qp_attr_mask |= IB_QP_TIMEOUT;
4210	qp_attr->timeout = cm_id_priv->av.timeout;
4211	break;
4212	default:
4213	break;
4214	}
4215	if (rdma_ah_get_dlid(attr: &cm_id_priv->alt_av.ah_attr)) {
4216	*qp_attr_mask |= IB_QP_PATH_MIG_STATE;
4217	qp_attr->path_mig_state = IB_MIG_REARM;
4218	}
4219	} else {
4220	*qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE;
4221	if (cm_id_priv->alt_av.port)
4222	qp_attr->alt_port_num =
4223	cm_id_priv->alt_av.port->port_num;
4224	qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
4225	qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
4226	qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
4227	qp_attr->path_mig_state = IB_MIG_REARM;
4228	}
4229	ret = 0;
4230	break;
4231	default:
4232	trace_icm_qp_rts_err(cm_id: &cm_id_priv->id);
4233	ret = -EINVAL;
4234	break;
4235	}
4236	spin_unlock_irqrestore(lock: &cm_id_priv->lock, flags);
4237	return ret;
4238	}
4239
4240	int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
4241	struct ib_qp_attr *qp_attr,
4242	int *qp_attr_mask)
4243	{
4244	struct cm_id_private *cm_id_priv;
4245	int ret;
4246
4247	cm_id_priv = container_of(cm_id, struct cm_id_private, id);
4248	switch (qp_attr->qp_state) {
4249	case IB_QPS_INIT:
4250	ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
4251	break;
4252	case IB_QPS_RTR:
4253	ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
4254	break;
4255	case IB_QPS_RTS:
4256	ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
4257	break;
4258	default:
4259	ret = -EINVAL;
4260	break;
4261	}
4262	return ret;
4263	}
4264	EXPORT_SYMBOL(ib_cm_init_qp_attr);
4265
4266	static ssize_t cm_show_counter(struct ib_device *ibdev, u32 port_num,
4267	struct ib_port_attribute *attr, char *buf)
4268	{
4269	struct cm_counter_attribute *cm_attr =
4270	container_of(attr, struct cm_counter_attribute, attr);
4271	struct cm_device *cm_dev = ib_get_client_data(device: ibdev, client: &cm_client);
4272
4273	if (WARN_ON(!cm_dev))
4274	return -EINVAL;
4275
4276	return sysfs_emit(
4277	buf, fmt: "%ld\n",
4278	atomic_long_read(
4279	v: &cm_dev->port[port_num - 1]
4280	->counters[cm_attr->group][cm_attr->index]));
4281	}
4282
4283	#define CM_COUNTER_ATTR(_name, _group, _index) \
4284	{ \
4285	.attr = __ATTR(_name, 0444, cm_show_counter, NULL), \
4286	.group = _group, .index = _index \
4287	}
4288
4289	#define CM_COUNTER_GROUP(_group, _name) \
4290	static struct cm_counter_attribute cm_counter_attr_##_group[] = { \
4291	CM_COUNTER_ATTR(req, _group, CM_REQ_COUNTER), \
4292	CM_COUNTER_ATTR(mra, _group, CM_MRA_COUNTER), \
4293	CM_COUNTER_ATTR(rej, _group, CM_REJ_COUNTER), \
4294	CM_COUNTER_ATTR(rep, _group, CM_REP_COUNTER), \
4295	CM_COUNTER_ATTR(rtu, _group, CM_RTU_COUNTER), \
4296	CM_COUNTER_ATTR(dreq, _group, CM_DREQ_COUNTER), \
4297	CM_COUNTER_ATTR(drep, _group, CM_DREP_COUNTER), \
4298	CM_COUNTER_ATTR(sidr_req, _group, CM_SIDR_REQ_COUNTER), \
4299	CM_COUNTER_ATTR(sidr_rep, _group, CM_SIDR_REP_COUNTER), \
4300	CM_COUNTER_ATTR(lap, _group, CM_LAP_COUNTER), \
4301	CM_COUNTER_ATTR(apr, _group, CM_APR_COUNTER), \
4302	}; \
4303	static struct attribute *cm_counter_attrs_##_group[] = { \
4304	&cm_counter_attr_##_group[0].attr.attr, \
4305	&cm_counter_attr_##_group[1].attr.attr, \
4306	&cm_counter_attr_##_group[2].attr.attr, \
4307	&cm_counter_attr_##_group[3].attr.attr, \
4308	&cm_counter_attr_##_group[4].attr.attr, \
4309	&cm_counter_attr_##_group[5].attr.attr, \
4310	&cm_counter_attr_##_group[6].attr.attr, \
4311	&cm_counter_attr_##_group[7].attr.attr, \
4312	&cm_counter_attr_##_group[8].attr.attr, \
4313	&cm_counter_attr_##_group[9].attr.attr, \
4314	&cm_counter_attr_##_group[10].attr.attr, \
4315	NULL, \
4316	}; \
4317	static const struct attribute_group cm_counter_group_##_group = { \
4318	.name = _name, \
4319	.attrs = cm_counter_attrs_##_group, \
4320	};
4321
4322	CM_COUNTER_GROUP(CM_XMIT, "cm_tx_msgs")
4323	CM_COUNTER_GROUP(CM_XMIT_RETRIES, "cm_tx_retries")
4324	CM_COUNTER_GROUP(CM_RECV, "cm_rx_msgs")
4325	CM_COUNTER_GROUP(CM_RECV_DUPLICATES, "cm_rx_duplicates")
4326
4327	static const struct attribute_group *cm_counter_groups[] = {
4328	&cm_counter_group_CM_XMIT,
4329	&cm_counter_group_CM_XMIT_RETRIES,
4330	&cm_counter_group_CM_RECV,
4331	&cm_counter_group_CM_RECV_DUPLICATES,
4332	NULL,
4333	};
4334
4335	static int cm_add_one(struct ib_device *ib_device)
4336	{
4337	struct cm_device *cm_dev;
4338	struct cm_port *port;
4339	struct ib_mad_reg_req reg_req = {
4340	.mgmt_class = IB_MGMT_CLASS_CM,
4341	.mgmt_class_version = IB_CM_CLASS_VERSION,
4342	};
4343	struct ib_port_modify port_modify = {
4344	.set_port_cap_mask = IB_PORT_CM_SUP
4345	};
4346	unsigned long flags;
4347	int ret;
4348	int count = 0;
4349	u32 i;
4350
4351	cm_dev = kzalloc(struct_size(cm_dev, port, ib_device->phys_port_cnt),
4352	GFP_KERNEL);
4353	if (!cm_dev)
4354	return -ENOMEM;
4355
4356	kref_init(kref: &cm_dev->kref);
4357	rwlock_init(&cm_dev->mad_agent_lock);
4358	cm_dev->ib_device = ib_device;
4359	cm_dev->ack_delay = ib_device->attrs.local_ca_ack_delay;
4360	cm_dev->going_down = 0;
4361
4362	ib_set_client_data(device: ib_device, client: &cm_client, data: cm_dev);
4363
4364	set_bit(IB_MGMT_METHOD_SEND, addr: reg_req.method_mask);
4365	rdma_for_each_port (ib_device, i) {
4366	if (!rdma_cap_ib_cm(device: ib_device, port_num: i))
4367	continue;
4368
4369	port = kzalloc(sizeof *port, GFP_KERNEL);
4370	if (!port) {
4371	ret = -ENOMEM;
4372	goto error1;
4373	}
4374
4375	cm_dev->port[i-1] = port;
4376	port->cm_dev = cm_dev;
4377	port->port_num = i;
4378
4379	ret = ib_port_register_client_groups(ibdev: ib_device, port_num: i,
4380	groups: cm_counter_groups);
4381	if (ret)
4382	goto error1;
4383
4384	port->mad_agent = ib_register_mad_agent(device: ib_device, port_num: i,
4385	qp_type: IB_QPT_GSI,
4386	mad_reg_req: &reg_req,
4387	rmpp_version: 0,
4388	send_handler: cm_send_handler,
4389	recv_handler: cm_recv_handler,
4390	context: port,
4391	registration_flags: 0);
4392	if (IS_ERR(ptr: port->mad_agent)) {
4393	ret = PTR_ERR(ptr: port->mad_agent);
4394	goto error2;
4395	}
4396
4397	port->rep_agent = ib_register_mad_agent(device: ib_device, port_num: i,
4398	qp_type: IB_QPT_GSI,
4399	NULL,
4400	rmpp_version: 0,
4401	send_handler: cm_send_handler,
4402	NULL,
4403	context: port,
4404	registration_flags: 0);
4405	if (IS_ERR(ptr: port->rep_agent)) {
4406	ret = PTR_ERR(ptr: port->rep_agent);
4407	goto error3;
4408	}
4409
4410	ret = ib_modify_port(device: ib_device, port_num: i, port_modify_mask: 0, port_modify: &port_modify);
4411	if (ret)
4412	goto error4;
4413
4414	count++;
4415	}
4416
4417	if (!count) {
4418	ret = -EOPNOTSUPP;
4419	goto free;
4420	}
4421
4422	write_lock_irqsave(&cm.device_lock, flags);
4423	list_add_tail(new: &cm_dev->list, head: &cm.device_list);
4424	write_unlock_irqrestore(&cm.device_lock, flags);
4425	return 0;
4426
4427	error4:
4428	ib_unregister_mad_agent(mad_agent: port->rep_agent);
4429	error3:
4430	ib_unregister_mad_agent(mad_agent: port->mad_agent);
4431	error2:
4432	ib_port_unregister_client_groups(ibdev: ib_device, port_num: i, groups: cm_counter_groups);
4433	error1:
4434	port_modify.set_port_cap_mask = 0;
4435	port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
4436	while (--i) {
4437	if (!rdma_cap_ib_cm(device: ib_device, port_num: i))
4438	continue;
4439
4440	port = cm_dev->port[i-1];
4441	ib_modify_port(device: ib_device, port_num: port->port_num, port_modify_mask: 0, port_modify: &port_modify);
4442	ib_unregister_mad_agent(mad_agent: port->rep_agent);
4443	ib_unregister_mad_agent(mad_agent: port->mad_agent);
4444	ib_port_unregister_client_groups(ibdev: ib_device, port_num: i,
4445	groups: cm_counter_groups);
4446	}
4447	free:
4448	cm_device_put(cm_dev);
4449	return ret;
4450	}
4451
4452	static void cm_remove_one(struct ib_device *ib_device, void *client_data)
4453	{
4454	struct cm_device *cm_dev = client_data;
4455	struct cm_port *port;
4456	struct ib_port_modify port_modify = {
4457	.clr_port_cap_mask = IB_PORT_CM_SUP
4458	};
4459	unsigned long flags;
4460	u32 i;
4461
4462	write_lock_irqsave(&cm.device_lock, flags);
4463	list_del(entry: &cm_dev->list);
4464	write_unlock_irqrestore(&cm.device_lock, flags);
4465
4466	spin_lock_irq(lock: &cm.lock);
4467	cm_dev->going_down = 1;
4468	spin_unlock_irq(lock: &cm.lock);
4469
4470	rdma_for_each_port (ib_device, i) {
4471	struct ib_mad_agent *mad_agent;
4472	struct ib_mad_agent *rep_agent;
4473
4474	if (!rdma_cap_ib_cm(device: ib_device, port_num: i))
4475	continue;
4476
4477	port = cm_dev->port[i-1];
4478	mad_agent = port->mad_agent;
4479	rep_agent = port->rep_agent;
4480	ib_modify_port(device: ib_device, port_num: port->port_num, port_modify_mask: 0, port_modify: &port_modify);
4481	/*
4482	* We flush the queue here after the going_down set, this
4483	* verify that no new works will be queued in the recv handler,
4484	* after that we can call the unregister_mad_agent
4485	*/
4486	flush_workqueue(cm.wq);
4487	/*
4488	* The above ensures no call paths from the work are running,
4489	* the remaining paths all take the mad_agent_lock.
4490	*/
4491	write_lock(&cm_dev->mad_agent_lock);
4492	port->mad_agent = NULL;
4493	port->rep_agent = NULL;
4494	write_unlock(&cm_dev->mad_agent_lock);
4495	ib_unregister_mad_agent(mad_agent);
4496	ib_unregister_mad_agent(mad_agent: rep_agent);
4497	ib_port_unregister_client_groups(ibdev: ib_device, port_num: i,
4498	groups: cm_counter_groups);
4499	}
4500
4501	cm_device_put(cm_dev);
4502	}
4503
4504	static int __init ib_cm_init(void)
4505	{
4506	int ret;
4507
4508	INIT_LIST_HEAD(list: &cm.device_list);
4509	rwlock_init(&cm.device_lock);
4510	spin_lock_init(&cm.lock);
4511	cm.listen_service_table = RB_ROOT;
4512	cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
4513	cm.remote_id_table = RB_ROOT;
4514	cm.remote_qp_table = RB_ROOT;
4515	cm.remote_sidr_table = RB_ROOT;
4516	xa_init_flags(xa: &cm.local_id_table, XA_FLAGS_ALLOC);
4517	get_random_bytes(buf: &cm.random_id_operand, len: sizeof cm.random_id_operand);
4518	INIT_LIST_HEAD(list: &cm.timewait_list);
4519
4520	cm.wq = alloc_workqueue("ib_cm", WQ_PERCPU, 1);
4521	if (!cm.wq) {
4522	ret = -ENOMEM;
4523	goto error2;
4524	}
4525
4526	ret = ib_register_client(client: &cm_client);
4527	if (ret)
4528	goto error3;
4529
4530	return 0;
4531	error3:
4532	destroy_workqueue(wq: cm.wq);
4533	error2:
4534	return ret;
4535	}
4536
4537	static void __exit ib_cm_cleanup(void)
4538	{
4539	struct cm_timewait_info *timewait_info, *tmp;
4540
4541	spin_lock_irq(lock: &cm.lock);
4542	list_for_each_entry(timewait_info, &cm.timewait_list, list)
4543	cancel_delayed_work(dwork: &timewait_info->work.work);
4544	spin_unlock_irq(lock: &cm.lock);
4545
4546	ib_unregister_client(client: &cm_client);
4547	destroy_workqueue(wq: cm.wq);
4548
4549	list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) {
4550	list_del(entry: &timewait_info->list);
4551	kfree(objp: timewait_info);
4552	}
4553
4554	WARN_ON(!xa_empty(&cm.local_id_table));
4555	}
4556
4557	module_init(ib_cm_init);
4558	module_exit(ib_cm_cleanup);
4559