1/* This file is part of the Emulex RoCE Device Driver for
2 * RoCE (RDMA over Converged Ethernet) adapters.
3 * Copyright (C) 2012-2015 Emulex. All rights reserved.
4 * EMULEX and SLI are trademarks of Emulex.
5 * www.emulex.com
6 *
7 * This software is available to you under a choice of one of two licenses.
8 * You may choose to be licensed under the terms of the GNU General Public
9 * License (GPL) Version 2, available from the file COPYING in the main
10 * directory of this source tree, or the BSD license below:
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 *
16 * - Redistributions of source code must retain the above copyright notice,
17 * this list of conditions and the following disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in
21 * the documentation and/or other materials provided with the distribution.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
24 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
27 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
32 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 *
35 * Contact Information:
36 * linux-drivers@emulex.com
37 *
38 * Emulex
39 * 3333 Susan Street
40 * Costa Mesa, CA 92626
41 */
42
43#include <net/neighbour.h>
44#include <net/netevent.h>
45
46#include <rdma/ib_addr.h>
47#include <rdma/ib_mad.h>
48#include <rdma/ib_cache.h>
49
50#include "ocrdma.h"
51#include "ocrdma_verbs.h"
52#include "ocrdma_ah.h"
53#include "ocrdma_hw.h"
54#include "ocrdma_stats.h"
55
56#define OCRDMA_VID_PCP_SHIFT 0xD
57
58static u16 ocrdma_hdr_type_to_proto_num(int devid, u8 hdr_type)
59{
60 switch (hdr_type) {
61 case OCRDMA_L3_TYPE_IB_GRH:
62 return (u16)ETH_P_IBOE;
63 case OCRDMA_L3_TYPE_IPV4:
64 return (u16)0x0800;
65 case OCRDMA_L3_TYPE_IPV6:
66 return (u16)0x86dd;
67 default:
68 pr_err("ocrdma%d: Invalid network header\n", devid);
69 return 0;
70 }
71}
72
73static inline int set_av_attr(struct ocrdma_dev *dev, struct ocrdma_ah *ah,
74 struct rdma_ah_attr *attr, const union ib_gid *sgid,
75 int pdid, bool *isvlan, u16 vlan_tag)
76{
77 int status;
78 struct ocrdma_eth_vlan eth;
79 struct ocrdma_grh grh;
80 int eth_sz;
81 u16 proto_num = 0;
82 u8 nxthdr = 0x11;
83 struct iphdr ipv4;
84 const struct ib_global_route *ib_grh;
85 union {
86 struct sockaddr_in _sockaddr_in;
87 struct sockaddr_in6 _sockaddr_in6;
88 } sgid_addr, dgid_addr;
89
90 memset(&eth, 0, sizeof(eth));
91 memset(&grh, 0, sizeof(grh));
92
93 /* Protocol Number */
94 proto_num = ocrdma_hdr_type_to_proto_num(devid: dev->id, hdr_type: ah->hdr_type);
95 if (!proto_num)
96 return -EINVAL;
97 nxthdr = (proto_num == ETH_P_IBOE) ? 0x1b : 0x11;
98 /* VLAN */
99 if (!vlan_tag || (vlan_tag > 0xFFF))
100 vlan_tag = dev->pvid;
101 if (vlan_tag || dev->pfc_state) {
102 if (!vlan_tag) {
103 pr_err("ocrdma%d:Using VLAN with PFC is recommended\n",
104 dev->id);
105 pr_err("ocrdma%d:Using VLAN 0 for this connection\n",
106 dev->id);
107 }
108 eth.eth_type = cpu_to_be16(0x8100);
109 eth.roce_eth_type = cpu_to_be16(proto_num);
110 vlan_tag |= (dev->sl & 0x07) << OCRDMA_VID_PCP_SHIFT;
111 eth.vlan_tag = cpu_to_be16(vlan_tag);
112 eth_sz = sizeof(struct ocrdma_eth_vlan);
113 *isvlan = true;
114 } else {
115 eth.eth_type = cpu_to_be16(proto_num);
116 eth_sz = sizeof(struct ocrdma_eth_basic);
117 }
118 /* MAC */
119 memcpy(&eth.smac[0], &dev->nic_info.mac_addr[0], ETH_ALEN);
120 status = ocrdma_resolve_dmac(dev, ah_attr: attr, mac_addr: &eth.dmac[0]);
121 if (status)
122 return status;
123 ib_grh = rdma_ah_read_grh(attr);
124 ah->sgid_index = ib_grh->sgid_index;
125 /* Eth HDR */
126 memcpy(&ah->av->eth_hdr, &eth, eth_sz);
127 if (ah->hdr_type == RDMA_NETWORK_IPV4) {
128 *((__be16 *)&ipv4) = htons((4 << 12) | (5 << 8) |
129 ib_grh->traffic_class);
130 ipv4.id = cpu_to_be16(pdid);
131 ipv4.frag_off = htons(IP_DF);
132 ipv4.tot_len = htons(0);
133 ipv4.ttl = ib_grh->hop_limit;
134 ipv4.protocol = nxthdr;
135 rdma_gid2ip(out: (struct sockaddr *)&sgid_addr, gid: sgid);
136 ipv4.saddr = sgid_addr._sockaddr_in.sin_addr.s_addr;
137 rdma_gid2ip(out: (struct sockaddr*)&dgid_addr, gid: &ib_grh->dgid);
138 ipv4.daddr = dgid_addr._sockaddr_in.sin_addr.s_addr;
139 memcpy((u8 *)ah->av + eth_sz, &ipv4, sizeof(struct iphdr));
140 } else {
141 memcpy(&grh.sgid[0], sgid->raw, sizeof(union ib_gid));
142 grh.tclass_flow = cpu_to_be32((6 << 28) |
143 (ib_grh->traffic_class << 24) |
144 ib_grh->flow_label);
145 memcpy(&grh.dgid[0], ib_grh->dgid.raw,
146 sizeof(ib_grh->dgid.raw));
147 grh.pdid_hoplimit = cpu_to_be32((pdid << 16) |
148 (nxthdr << 8) |
149 ib_grh->hop_limit);
150 memcpy((u8 *)ah->av + eth_sz, &grh, sizeof(struct ocrdma_grh));
151 }
152 if (*isvlan)
153 ah->av->valid |= OCRDMA_AV_VLAN_VALID;
154 ah->av->valid = cpu_to_le32(ah->av->valid);
155 return status;
156}
157
158int ocrdma_create_ah(struct ib_ah *ibah, struct rdma_ah_init_attr *init_attr,
159 struct ib_udata *udata)
160{
161 u32 *ahid_addr;
162 int status;
163 struct ocrdma_ah *ah = get_ocrdma_ah(ibah);
164 bool isvlan = false;
165 u16 vlan_tag = 0xffff;
166 const struct ib_gid_attr *sgid_attr;
167 struct ocrdma_pd *pd = get_ocrdma_pd(ibpd: ibah->pd);
168 struct rdma_ah_attr *attr = init_attr->ah_attr;
169 struct ocrdma_dev *dev = get_ocrdma_dev(ibdev: ibah->device);
170
171 if ((attr->type != RDMA_AH_ATTR_TYPE_ROCE) ||
172 !(rdma_ah_get_ah_flags(attr) & IB_AH_GRH))
173 return -EINVAL;
174
175 if (atomic_cmpxchg(v: &dev->update_sl, old: 1, new: 0))
176 ocrdma_init_service_level(dev);
177
178 sgid_attr = attr->grh.sgid_attr;
179 status = rdma_read_gid_l2_fields(attr: sgid_attr, vlan_id: &vlan_tag, NULL);
180 if (status)
181 return status;
182
183 status = ocrdma_alloc_av(dev, ah);
184 if (status)
185 goto av_err;
186
187 /* Get network header type for this GID */
188 ah->hdr_type = rdma_gid_attr_network_type(attr: sgid_attr);
189
190 status = set_av_attr(dev, ah, attr, sgid: &sgid_attr->gid, pdid: pd->id,
191 isvlan: &isvlan, vlan_tag);
192 if (status)
193 goto av_conf_err;
194
195 /* if pd is for the user process, pass the ah_id to user space */
196 if ((pd->uctx) && (pd->uctx->ah_tbl.va)) {
197 ahid_addr = pd->uctx->ah_tbl.va + rdma_ah_get_dlid(attr);
198 *ahid_addr = 0;
199 *ahid_addr |= ah->id & OCRDMA_AH_ID_MASK;
200 if (ocrdma_is_udp_encap_supported(dev)) {
201 *ahid_addr |= ((u32)ah->hdr_type &
202 OCRDMA_AH_L3_TYPE_MASK) <<
203 OCRDMA_AH_L3_TYPE_SHIFT;
204 }
205 if (isvlan)
206 *ahid_addr |= (OCRDMA_AH_VLAN_VALID_MASK <<
207 OCRDMA_AH_VLAN_VALID_SHIFT);
208 }
209
210 return 0;
211
212av_conf_err:
213 ocrdma_free_av(dev, ah);
214av_err:
215 return status;
216}
217
218int ocrdma_destroy_ah(struct ib_ah *ibah, u32 flags)
219{
220 struct ocrdma_ah *ah = get_ocrdma_ah(ibah);
221 struct ocrdma_dev *dev = get_ocrdma_dev(ibdev: ibah->device);
222
223 ocrdma_free_av(dev, ah);
224 return 0;
225}
226
227int ocrdma_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *attr)
228{
229 struct ocrdma_ah *ah = get_ocrdma_ah(ibah);
230 struct ocrdma_av *av = ah->av;
231 struct ocrdma_grh *grh;
232
233 attr->type = ibah->type;
234 if (ah->av->valid & OCRDMA_AV_VALID) {
235 grh = (struct ocrdma_grh *)((u8 *)ah->av +
236 sizeof(struct ocrdma_eth_vlan));
237 rdma_ah_set_sl(attr, be16_to_cpu(av->eth_hdr.vlan_tag) >> 13);
238 } else {
239 grh = (struct ocrdma_grh *)((u8 *)ah->av +
240 sizeof(struct ocrdma_eth_basic));
241 rdma_ah_set_sl(attr, sl: 0);
242 }
243 rdma_ah_set_grh(attr, NULL,
244 be32_to_cpu(grh->tclass_flow) & 0xffffffff,
245 sgid_index: ah->sgid_index,
246 be32_to_cpu(grh->pdid_hoplimit) & 0xff,
247 be32_to_cpu(grh->tclass_flow) >> 24);
248 rdma_ah_set_dgid_raw(attr, dgid: &grh->dgid[0]);
249 return 0;
250}
251
252int ocrdma_process_mad(struct ib_device *ibdev, int process_mad_flags,
253 u32 port_num, const struct ib_wc *in_wc,
254 const struct ib_grh *in_grh, const struct ib_mad *in,
255 struct ib_mad *out, size_t *out_mad_size,
256 u16 *out_mad_pkey_index)
257{
258 int status = IB_MAD_RESULT_SUCCESS;
259 struct ocrdma_dev *dev;
260
261 if (in->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT) {
262 dev = get_ocrdma_dev(ibdev);
263 ocrdma_pma_counters(dev, out_mad: out);
264 status |= IB_MAD_RESULT_REPLY;
265 }
266
267 return status;
268}
269

source code of linux/drivers/infiniband/hw/ocrdma/ocrdma_ah.c