1/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
2/*
3 * Copyright (c) 2020, Mellanox Technologies inc. All rights reserved.
4 */
5
6#ifndef _MLX5_IB_WR_H
7#define _MLX5_IB_WR_H
8
9#include "mlx5_ib.h"
10
11enum {
12 MLX5_IB_SQ_UMR_INLINE_THRESHOLD = 64,
13};
14
15struct mlx5_wqe_eth_pad {
16 u8 rsvd0[16];
17};
18
19
20/* get_sq_edge - Get the next nearby edge.
21 *
22 * An 'edge' is defined as the first following address after the end
23 * of the fragment or the SQ. Accordingly, during the WQE construction
24 * which repetitively increases the pointer to write the next data, it
25 * simply should check if it gets to an edge.
26 *
27 * @sq - SQ buffer.
28 * @idx - Stride index in the SQ buffer.
29 *
30 * Return:
31 * The new edge.
32 */
33static inline void *get_sq_edge(struct mlx5_ib_wq *sq, u32 idx)
34{
35 void *fragment_end;
36
37 fragment_end = mlx5_frag_buf_get_wqe
38 (fbc: &sq->fbc,
39 ix: mlx5_frag_buf_get_idx_last_contig_stride(fbc: &sq->fbc, ix: idx));
40
41 return fragment_end + MLX5_SEND_WQE_BB;
42}
43
44/* handle_post_send_edge - Check if we get to SQ edge. If yes, update to the
45 * next nearby edge and get new address translation for current WQE position.
46 * @sq: SQ buffer.
47 * @seg: Current WQE position (16B aligned).
48 * @wqe_sz: Total current WQE size [16B].
49 * @cur_edge: Updated current edge.
50 */
51static inline void handle_post_send_edge(struct mlx5_ib_wq *sq, void **seg,
52 u32 wqe_sz, void **cur_edge)
53{
54 u32 idx;
55
56 if (likely(*seg != *cur_edge))
57 return;
58
59 idx = (sq->cur_post + (wqe_sz >> 2)) & (sq->wqe_cnt - 1);
60 *cur_edge = get_sq_edge(sq, idx);
61
62 *seg = mlx5_frag_buf_get_wqe(fbc: &sq->fbc, ix: idx);
63}
64
65/* mlx5r_memcpy_send_wqe - copy data from src to WQE and update the relevant
66 * WQ's pointers. At the end @seg is aligned to 16B regardless the copied size.
67 * @sq: SQ buffer.
68 * @cur_edge: Updated current edge.
69 * @seg: Current WQE position (16B aligned).
70 * @wqe_sz: Total current WQE size [16B].
71 * @src: Pointer to copy from.
72 * @n: Number of bytes to copy.
73 */
74static inline void mlx5r_memcpy_send_wqe(struct mlx5_ib_wq *sq, void **cur_edge,
75 void **seg, u32 *wqe_sz,
76 const void *src, size_t n)
77{
78 while (likely(n)) {
79 size_t leftlen = *cur_edge - *seg;
80 size_t copysz = min_t(size_t, leftlen, n);
81 size_t stride;
82
83 memcpy(*seg, src, copysz);
84
85 n -= copysz;
86 src += copysz;
87 stride = !n ? ALIGN(copysz, 16) : copysz;
88 *seg += stride;
89 *wqe_sz += stride >> 4;
90 handle_post_send_edge(sq, seg, wqe_sz: *wqe_sz, cur_edge);
91 }
92}
93
94int mlx5r_wq_overflow(struct mlx5_ib_wq *wq, int nreq, struct ib_cq *ib_cq);
95int mlx5r_begin_wqe(struct mlx5_ib_qp *qp, void **seg,
96 struct mlx5_wqe_ctrl_seg **ctrl, unsigned int *idx,
97 int *size, void **cur_edge, int nreq, __be32 general_id,
98 bool send_signaled, bool solicited);
99void mlx5r_finish_wqe(struct mlx5_ib_qp *qp, struct mlx5_wqe_ctrl_seg *ctrl,
100 void *seg, u8 size, void *cur_edge, unsigned int idx,
101 u64 wr_id, int nreq, u8 fence, u32 mlx5_opcode);
102void mlx5r_ring_db(struct mlx5_ib_qp *qp, unsigned int nreq,
103 struct mlx5_wqe_ctrl_seg *ctrl);
104int mlx5_ib_post_send(struct ib_qp *ibqp, const struct ib_send_wr *wr,
105 const struct ib_send_wr **bad_wr, bool drain);
106int mlx5_ib_post_recv(struct ib_qp *ibqp, const struct ib_recv_wr *wr,
107 const struct ib_recv_wr **bad_wr, bool drain);
108
109static inline int mlx5_ib_post_send_nodrain(struct ib_qp *ibqp,
110 const struct ib_send_wr *wr,
111 const struct ib_send_wr **bad_wr)
112{
113 return mlx5_ib_post_send(ibqp, wr, bad_wr, drain: false);
114}
115
116static inline int mlx5_ib_post_send_drain(struct ib_qp *ibqp,
117 const struct ib_send_wr *wr,
118 const struct ib_send_wr **bad_wr)
119{
120 return mlx5_ib_post_send(ibqp, wr, bad_wr, drain: true);
121}
122
123static inline int mlx5_ib_post_recv_nodrain(struct ib_qp *ibqp,
124 const struct ib_recv_wr *wr,
125 const struct ib_recv_wr **bad_wr)
126{
127 return mlx5_ib_post_recv(ibqp, wr, bad_wr, drain: false);
128}
129
130static inline int mlx5_ib_post_recv_drain(struct ib_qp *ibqp,
131 const struct ib_recv_wr *wr,
132 const struct ib_recv_wr **bad_wr)
133{
134 return mlx5_ib_post_recv(ibqp, wr, bad_wr, drain: true);
135}
136#endif /* _MLX5_IB_WR_H */
137

source code of linux/drivers/infiniband/hw/mlx5/wr.h