1 /*
2 * Copyright (c) 2013-2015, Mellanox Technologies, Ltd. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 */
32
33 #ifndef __MLX5_WQ_H__
34 #define __MLX5_WQ_H__
35
36 #include <linux/mlx5/mlx5_ifc.h>
37
38 struct mlx5_wq_param {
39 int linear;
40 int buf_numa_node;
41 int db_numa_node;
42 };
43
44 struct mlx5_wq_ctrl {
45 struct mlx5_core_dev *mdev;
46 struct mlx5_buf buf;
47 struct mlx5_db db;
48 };
49
50 struct mlx5_wq_cyc {
51 void *buf;
52 __be32 *db;
53 u16 sz_m1;
54 u8 log_stride;
55 };
56
57 struct mlx5_cqwq {
58 void *buf;
59 __be32 *db;
60 u32 sz_m1;
61 u32 cc; /* consumer counter */
62 u8 log_sz;
63 u8 log_stride;
64 };
65
66 struct mlx5_wq_ll {
67 void *buf;
68 __be32 *db;
69 __be16 *tail_next;
70 u16 sz_m1;
71 u16 head;
72 u16 wqe_ctr;
73 u16 cur_sz;
74 u8 log_stride;
75 };
76
77 int mlx5_wq_cyc_create(struct mlx5_core_dev *mdev, struct mlx5_wq_param *param,
78 void *wqc, struct mlx5_wq_cyc *wq,
79 struct mlx5_wq_ctrl *wq_ctrl);
80 u32 mlx5_wq_cyc_get_size(struct mlx5_wq_cyc *wq);
81
82 int mlx5_cqwq_create(struct mlx5_core_dev *mdev, struct mlx5_wq_param *param,
83 void *cqc, struct mlx5_cqwq *wq,
84 struct mlx5_wq_ctrl *wq_ctrl);
85 u32 mlx5_cqwq_get_size(struct mlx5_cqwq *wq);
86
87 int mlx5_wq_ll_create(struct mlx5_core_dev *mdev, struct mlx5_wq_param *param,
88 void *wqc, struct mlx5_wq_ll *wq,
89 struct mlx5_wq_ctrl *wq_ctrl);
90 u32 mlx5_wq_ll_get_size(struct mlx5_wq_ll *wq);
91
92 void mlx5_wq_destroy(struct mlx5_wq_ctrl *wq_ctrl);
93
mlx5_wq_cyc_ctr2ix(struct mlx5_wq_cyc * wq,u16 ctr)94 static inline u16 mlx5_wq_cyc_ctr2ix(struct mlx5_wq_cyc *wq, u16 ctr)
95 {
96 return ctr & wq->sz_m1;
97 }
98
mlx5_wq_cyc_get_wqe(struct mlx5_wq_cyc * wq,u16 ix)99 static inline void *mlx5_wq_cyc_get_wqe(struct mlx5_wq_cyc *wq, u16 ix)
100 {
101 return wq->buf + (ix << wq->log_stride);
102 }
103
mlx5_wq_cyc_cc_bigger(u16 cc1,u16 cc2)104 static inline int mlx5_wq_cyc_cc_bigger(u16 cc1, u16 cc2)
105 {
106 int equal = (cc1 == cc2);
107 int smaller = 0x8000 & (cc1 - cc2);
108
109 return !equal && !smaller;
110 }
111
mlx5_cqwq_get_ci(struct mlx5_cqwq * wq)112 static inline u32 mlx5_cqwq_get_ci(struct mlx5_cqwq *wq)
113 {
114 return wq->cc & wq->sz_m1;
115 }
116
mlx5_cqwq_get_wqe(struct mlx5_cqwq * wq,u32 ix)117 static inline void *mlx5_cqwq_get_wqe(struct mlx5_cqwq *wq, u32 ix)
118 {
119 return wq->buf + (ix << wq->log_stride);
120 }
121
mlx5_cqwq_get_wrap_cnt(struct mlx5_cqwq * wq)122 static inline u32 mlx5_cqwq_get_wrap_cnt(struct mlx5_cqwq *wq)
123 {
124 return wq->cc >> wq->log_sz;
125 }
126
mlx5_cqwq_pop(struct mlx5_cqwq * wq)127 static inline void mlx5_cqwq_pop(struct mlx5_cqwq *wq)
128 {
129 wq->cc++;
130 }
131
mlx5_cqwq_update_db_record(struct mlx5_cqwq * wq)132 static inline void mlx5_cqwq_update_db_record(struct mlx5_cqwq *wq)
133 {
134 *wq->db = cpu_to_be32(wq->cc & 0xffffff);
135 }
136
mlx5_wq_ll_is_full(struct mlx5_wq_ll * wq)137 static inline int mlx5_wq_ll_is_full(struct mlx5_wq_ll *wq)
138 {
139 return wq->cur_sz == wq->sz_m1;
140 }
141
mlx5_wq_ll_is_empty(struct mlx5_wq_ll * wq)142 static inline int mlx5_wq_ll_is_empty(struct mlx5_wq_ll *wq)
143 {
144 return !wq->cur_sz;
145 }
146
mlx5_wq_ll_get_wqe(struct mlx5_wq_ll * wq,u16 ix)147 static inline void *mlx5_wq_ll_get_wqe(struct mlx5_wq_ll *wq, u16 ix)
148 {
149 return wq->buf + (ix << wq->log_stride);
150 }
151
mlx5_wq_ll_push(struct mlx5_wq_ll * wq,u16 head_next)152 static inline void mlx5_wq_ll_push(struct mlx5_wq_ll *wq, u16 head_next)
153 {
154 wq->head = head_next;
155 wq->wqe_ctr++;
156 wq->cur_sz++;
157 }
158
mlx5_wq_ll_pop(struct mlx5_wq_ll * wq,__be16 ix,__be16 * next_tail_next)159 static inline void mlx5_wq_ll_pop(struct mlx5_wq_ll *wq, __be16 ix,
160 __be16 *next_tail_next)
161 {
162 *wq->tail_next = ix;
163 wq->tail_next = next_tail_next;
164 wq->cur_sz--;
165 }
166
mlx5_wq_ll_update_db_record(struct mlx5_wq_ll * wq)167 static inline void mlx5_wq_ll_update_db_record(struct mlx5_wq_ll *wq)
168 {
169 *wq->db = cpu_to_be32(wq->wqe_ctr);
170 }
171
172 #endif /* __MLX5_WQ_H__ */
173