root/drivers/net/ethernet/mellanox/mlx5/core/wq.h

INCLUDED FROM

DEFINITIONS

1. mlx5_wq_cyc_is_full
2. mlx5_wq_cyc_missing
3. mlx5_wq_cyc_is_empty
4. mlx5_wq_cyc_push
5. mlx5_wq_cyc_push_n
6. mlx5_wq_cyc_pop
7. mlx5_wq_cyc_update_db_record
8. mlx5_wq_cyc_ctr2ix
9. mlx5_wq_cyc_get_head
10. mlx5_wq_cyc_get_tail
11. mlx5_wq_cyc_get_wqe
12. mlx5_wq_cyc_get_contig_wqebbs
13. mlx5_wq_cyc_cc_bigger
14. mlx5_cqwq_ctr2ix
15. mlx5_cqwq_get_ci
16. mlx5_cqwq_get_wqe
17. mlx5_cqwq_get_ctr_wrap_cnt
18. mlx5_cqwq_get_wrap_cnt
19. mlx5_cqwq_pop
20. mlx5_cqwq_update_db_record
21. mlx5_cqwq_get_cqe
22. mlx5_wq_ll_is_full
23. mlx5_wq_ll_is_empty
24. mlx5_wq_ll_missing
25. mlx5_wq_ll_get_wqe
26. mlx5_wq_ll_get_wqe_next_ix
27. mlx5_wq_ll_push
28. mlx5_wq_ll_pop
29. mlx5_wq_ll_update_db_record

   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 #include <linux/mlx5/cq.h>
  38 #include <linux/mlx5/qp.h>
  39 
  40 struct mlx5_wq_param {
  41         int             buf_numa_node;
  42         int             db_numa_node;
  43 };
  44 
  45 struct mlx5_wq_ctrl {
  46         struct mlx5_core_dev    *mdev;
  47         struct mlx5_frag_buf    buf;
  48         struct mlx5_db          db;
  49 };
  50 
  51 struct mlx5_wq_cyc {
  52         struct mlx5_frag_buf_ctrl fbc;
  53         __be32                  *db;
  54         u16                     sz;
  55         u16                     wqe_ctr;
  56         u16                     cur_sz;
  57 };
  58 
  59 struct mlx5_wq_qp {
  60         struct mlx5_wq_cyc      rq;
  61         struct mlx5_wq_cyc      sq;
  62 };
  63 
  64 struct mlx5_cqwq {
  65         struct mlx5_frag_buf_ctrl fbc;
  66         __be32                    *db;
  67         u32                       cc; /* consumer counter */
  68 };
  69 
  70 struct mlx5_wq_ll {
  71         struct mlx5_frag_buf_ctrl fbc;
  72         __be32                  *db;
  73         __be16                  *tail_next;
  74         u16                     head;
  75         u16                     wqe_ctr;
  76         u16                     cur_sz;
  77 };
  78 
  79 int mlx5_wq_cyc_create(struct mlx5_core_dev *mdev, struct mlx5_wq_param *param,
  80                        void *wqc, struct mlx5_wq_cyc *wq,
  81                        struct mlx5_wq_ctrl *wq_ctrl);
  82 u32 mlx5_wq_cyc_get_size(struct mlx5_wq_cyc *wq);
  83 void mlx5_wq_cyc_reset(struct mlx5_wq_cyc *wq);
  84 
  85 int mlx5_wq_qp_create(struct mlx5_core_dev *mdev, struct mlx5_wq_param *param,
  86                       void *qpc, struct mlx5_wq_qp *wq,
  87                       struct mlx5_wq_ctrl *wq_ctrl);
  88 void mlx5_wq_ll_reset(struct mlx5_wq_ll *wq);
  89 
  90 int mlx5_cqwq_create(struct mlx5_core_dev *mdev, struct mlx5_wq_param *param,
  91                      void *cqc, struct mlx5_cqwq *wq,
  92                      struct mlx5_wq_ctrl *wq_ctrl);
  93 u32 mlx5_cqwq_get_size(struct mlx5_cqwq *wq);
  94 u8 mlx5_cqwq_get_log_stride_size(struct mlx5_cqwq *wq);
  95 
  96 int mlx5_wq_ll_create(struct mlx5_core_dev *mdev, struct mlx5_wq_param *param,
  97                       void *wqc, struct mlx5_wq_ll *wq,
  98                       struct mlx5_wq_ctrl *wq_ctrl);
  99 u32 mlx5_wq_ll_get_size(struct mlx5_wq_ll *wq);
 100 
 101 void mlx5_wq_destroy(struct mlx5_wq_ctrl *wq_ctrl);
 102 
 103 static inline int mlx5_wq_cyc_is_full(struct mlx5_wq_cyc *wq)
 104 {
 105         return wq->cur_sz == wq->sz;
 106 }
 107 
 108 static inline int mlx5_wq_cyc_missing(struct mlx5_wq_cyc *wq)
 109 {
 110         return wq->sz - wq->cur_sz;
 111 }
 112 
 113 static inline int mlx5_wq_cyc_is_empty(struct mlx5_wq_cyc *wq)
 114 {
 115         return !wq->cur_sz;
 116 }
 117 
 118 static inline void mlx5_wq_cyc_push(struct mlx5_wq_cyc *wq)
 119 {
 120         wq->wqe_ctr++;
 121         wq->cur_sz++;
 122 }
 123 
 124 static inline void mlx5_wq_cyc_push_n(struct mlx5_wq_cyc *wq, u8 n)
 125 {
 126         wq->wqe_ctr += n;
 127         wq->cur_sz += n;
 128 }
 129 
 130 static inline void mlx5_wq_cyc_pop(struct mlx5_wq_cyc *wq)
 131 {
 132         wq->cur_sz--;
 133 }
 134 
 135 static inline void mlx5_wq_cyc_update_db_record(struct mlx5_wq_cyc *wq)
 136 {
 137         *wq->db = cpu_to_be32(wq->wqe_ctr);
 138 }
 139 
 140 static inline u16 mlx5_wq_cyc_ctr2ix(struct mlx5_wq_cyc *wq, u16 ctr)
 141 {
 142         return ctr & wq->fbc.sz_m1;
 143 }
 144 
 145 static inline u16 mlx5_wq_cyc_get_head(struct mlx5_wq_cyc *wq)
 146 {
 147         return mlx5_wq_cyc_ctr2ix(wq, wq->wqe_ctr);
 148 }
 149 
 150 static inline u16 mlx5_wq_cyc_get_tail(struct mlx5_wq_cyc *wq)
 151 {
 152         return mlx5_wq_cyc_ctr2ix(wq, wq->wqe_ctr - wq->cur_sz);
 153 }
 154 
 155 static inline void *mlx5_wq_cyc_get_wqe(struct mlx5_wq_cyc *wq, u16 ix)
 156 {
 157         return mlx5_frag_buf_get_wqe(&wq->fbc, ix);
 158 }
 159 
 160 static inline u16 mlx5_wq_cyc_get_contig_wqebbs(struct mlx5_wq_cyc *wq, u16 ix)
 161 {
 162         return mlx5_frag_buf_get_idx_last_contig_stride(&wq->fbc, ix) - ix + 1;
 163 }
 164 
 165 static inline int mlx5_wq_cyc_cc_bigger(u16 cc1, u16 cc2)
 166 {
 167         int equal   = (cc1 == cc2);
 168         int smaller = 0x8000 & (cc1 - cc2);
 169 
 170         return !equal && !smaller;
 171 }
 172 
 173 static inline u32 mlx5_cqwq_ctr2ix(struct mlx5_cqwq *wq, u32 ctr)
 174 {
 175         return ctr & wq->fbc.sz_m1;
 176 }
 177 
 178 static inline u32 mlx5_cqwq_get_ci(struct mlx5_cqwq *wq)
 179 {
 180         return mlx5_cqwq_ctr2ix(wq, wq->cc);
 181 }
 182 
 183 static inline struct mlx5_cqe64 *mlx5_cqwq_get_wqe(struct mlx5_cqwq *wq, u32 ix)
 184 {
 185         struct mlx5_cqe64 *cqe = mlx5_frag_buf_get_wqe(&wq->fbc, ix);
 186 
 187         /* For 128B CQEs the data is in the last 64B */
 188         cqe += wq->fbc.log_stride == 7;
 189 
 190         return cqe;
 191 }
 192 
 193 static inline u32 mlx5_cqwq_get_ctr_wrap_cnt(struct mlx5_cqwq *wq, u32 ctr)
 194 {
 195         return ctr >> wq->fbc.log_sz;
 196 }
 197 
 198 static inline u32 mlx5_cqwq_get_wrap_cnt(struct mlx5_cqwq *wq)
 199 {
 200         return mlx5_cqwq_get_ctr_wrap_cnt(wq, wq->cc);
 201 }
 202 
 203 static inline void mlx5_cqwq_pop(struct mlx5_cqwq *wq)
 204 {
 205         wq->cc++;
 206 }
 207 
 208 static inline void mlx5_cqwq_update_db_record(struct mlx5_cqwq *wq)
 209 {
 210         *wq->db = cpu_to_be32(wq->cc & 0xffffff);
 211 }
 212 
 213 static inline struct mlx5_cqe64 *mlx5_cqwq_get_cqe(struct mlx5_cqwq *wq)
 214 {
 215         u32 ci = mlx5_cqwq_get_ci(wq);
 216         struct mlx5_cqe64 *cqe = mlx5_cqwq_get_wqe(wq, ci);
 217         u8 cqe_ownership_bit = cqe->op_own & MLX5_CQE_OWNER_MASK;
 218         u8 sw_ownership_val = mlx5_cqwq_get_wrap_cnt(wq) & 1;
 219 
 220         if (cqe_ownership_bit != sw_ownership_val)
 221                 return NULL;
 222 
 223         /* ensure cqe content is read after cqe ownership bit */
 224         dma_rmb();
 225 
 226         return cqe;
 227 }
 228 
 229 static inline int mlx5_wq_ll_is_full(struct mlx5_wq_ll *wq)
 230 {
 231         return wq->cur_sz == wq->fbc.sz_m1;
 232 }
 233 
 234 static inline int mlx5_wq_ll_is_empty(struct mlx5_wq_ll *wq)
 235 {
 236         return !wq->cur_sz;
 237 }
 238 
 239 static inline int mlx5_wq_ll_missing(struct mlx5_wq_ll *wq)
 240 {
 241         return wq->fbc.sz_m1 - wq->cur_sz;
 242 }
 243 
 244 static inline void *mlx5_wq_ll_get_wqe(struct mlx5_wq_ll *wq, u16 ix)
 245 {
 246         return mlx5_frag_buf_get_wqe(&wq->fbc, ix);
 247 }
 248 
 249 static inline u16 mlx5_wq_ll_get_wqe_next_ix(struct mlx5_wq_ll *wq, u16 ix)
 250 {
 251         struct mlx5_wqe_srq_next_seg *wqe = mlx5_wq_ll_get_wqe(wq, ix);
 252 
 253         return be16_to_cpu(wqe->next_wqe_index);
 254 }
 255 
 256 static inline void mlx5_wq_ll_push(struct mlx5_wq_ll *wq, u16 head_next)
 257 {
 258         wq->head = head_next;
 259         wq->wqe_ctr++;
 260         wq->cur_sz++;
 261 }
 262 
 263 static inline void mlx5_wq_ll_pop(struct mlx5_wq_ll *wq, __be16 ix,
 264                                   __be16 *next_tail_next)
 265 {
 266         *wq->tail_next = ix;
 267         wq->tail_next = next_tail_next;
 268         wq->cur_sz--;
 269 }
 270 
 271 static inline void mlx5_wq_ll_update_db_record(struct mlx5_wq_ll *wq)
 272 {
 273         *wq->db = cpu_to_be32(wq->wqe_ctr);
 274 }
 275 
 276 #endif /* __MLX5_WQ_H__ */