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

   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 void mlx5_wq_cyc_wqe_dump(struct mlx5_wq_cyc *wq, u16 ix, u8 nstrides);
  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
  89 int mlx5_cqwq_create(struct mlx5_core_dev *mdev, struct mlx5_wq_param *param,
  90                      void *cqc, struct mlx5_cqwq *wq,
  91                      struct mlx5_wq_ctrl *wq_ctrl);
  92
  93 int mlx5_wq_ll_create(struct mlx5_core_dev *mdev, struct mlx5_wq_param *param,
  94                       void *wqc, struct mlx5_wq_ll *wq,
  95                       struct mlx5_wq_ctrl *wq_ctrl);
  96 void mlx5_wq_ll_reset(struct mlx5_wq_ll *wq);
  97
  98 void mlx5_wq_destroy(struct mlx5_wq_ctrl *wq_ctrl);
  99
 100 static inline u32 mlx5_wq_cyc_get_size(struct mlx5_wq_cyc *wq)
 101 {
 102         return (u32)wq->fbc.sz_m1 + 1;
 103 }
 104
 105 static inline int mlx5_wq_cyc_is_full(struct mlx5_wq_cyc *wq)
 106 {
 107         return wq->cur_sz == wq->sz;
 108 }
 109
 110 static inline int mlx5_wq_cyc_missing(struct mlx5_wq_cyc *wq)
 111 {
 112         return wq->sz - wq->cur_sz;
 113 }
 114
 115 static inline int mlx5_wq_cyc_is_empty(struct mlx5_wq_cyc *wq)
 116 {
 117         return !wq->cur_sz;
 118 }
 119
 120 static inline void mlx5_wq_cyc_push(struct mlx5_wq_cyc *wq)
 121 {
 122         wq->wqe_ctr++;
 123         wq->cur_sz++;
 124 }
 125
 126 static inline void mlx5_wq_cyc_push_n(struct mlx5_wq_cyc *wq, u8 n)
 127 {
 128         wq->wqe_ctr += n;
 129         wq->cur_sz += n;
 130 }
 131
 132 static inline void mlx5_wq_cyc_pop(struct mlx5_wq_cyc *wq)
 133 {
 134         wq->cur_sz--;
 135 }
 136
 137 static inline void mlx5_wq_cyc_update_db_record(struct mlx5_wq_cyc *wq)
 138 {
 139         *wq->db = cpu_to_be32(wq->wqe_ctr);
 140 }
 141
 142 static inline u16 mlx5_wq_cyc_ctr2ix(struct mlx5_wq_cyc *wq, u16 ctr)
 143 {
 144         return ctr & wq->fbc.sz_m1;
 145 }
 146
 147 static inline u16 mlx5_wq_cyc_get_head(struct mlx5_wq_cyc *wq)
 148 {
 149         return mlx5_wq_cyc_ctr2ix(wq, wq->wqe_ctr);
 150 }
 151
 152 static inline u16 mlx5_wq_cyc_get_tail(struct mlx5_wq_cyc *wq)
 153 {
 154         return mlx5_wq_cyc_ctr2ix(wq, wq->wqe_ctr - wq->cur_sz);
 155 }
 156
 157 static inline void *mlx5_wq_cyc_get_wqe(struct mlx5_wq_cyc *wq, u16 ix)
 158 {
 159         return mlx5_frag_buf_get_wqe(&wq->fbc, ix);
 160 }
 161
 162 static inline u16 mlx5_wq_cyc_get_contig_wqebbs(struct mlx5_wq_cyc *wq, u16 ix)
 163 {
 164         return mlx5_frag_buf_get_idx_last_contig_stride(&wq->fbc, ix) - ix + 1;
 165 }
 166
 167 static inline int mlx5_wq_cyc_cc_bigger(u16 cc1, u16 cc2)
 168 {
 169         int equal   = (cc1 == cc2);
 170         int smaller = 0x8000 & (cc1 - cc2);
 171
 172         return !equal && !smaller;
 173 }
 174
 175 static inline u16 mlx5_wq_cyc_get_counter(struct mlx5_wq_cyc *wq)
 176 {
 177         return wq->wqe_ctr;
 178 }
 179
 180 static inline u32 mlx5_cqwq_get_size(struct mlx5_cqwq *wq)
 181 {
 182         return wq->fbc.sz_m1 + 1;
 183 }
 184
 185 static inline u8 mlx5_cqwq_get_log_stride_size(struct mlx5_cqwq *wq)
 186 {
 187         return wq->fbc.log_stride;
 188 }
 189
 190 static inline u32 mlx5_cqwq_ctr2ix(struct mlx5_cqwq *wq, u32 ctr)
 191 {
 192         return ctr & wq->fbc.sz_m1;
 193 }
 194
 195 static inline u32 mlx5_cqwq_get_ci(struct mlx5_cqwq *wq)
 196 {
 197         return mlx5_cqwq_ctr2ix(wq, wq->cc);
 198 }
 199
 200 static inline struct mlx5_cqe64 *mlx5_cqwq_get_wqe(struct mlx5_cqwq *wq, u32 ix)
 201 {
 202         struct mlx5_cqe64 *cqe = mlx5_frag_buf_get_wqe(&wq->fbc, ix);
 203
 204         /* For 128B CQEs the data is in the last 64B */
 205         cqe += wq->fbc.log_stride == 7;
 206
 207         return cqe;
 208 }
 209
 210 static inline u32 mlx5_cqwq_get_ctr_wrap_cnt(struct mlx5_cqwq *wq, u32 ctr)
 211 {
 212         return ctr >> wq->fbc.log_sz;
 213 }
 214
 215 static inline u32 mlx5_cqwq_get_wrap_cnt(struct mlx5_cqwq *wq)
 216 {
 217         return mlx5_cqwq_get_ctr_wrap_cnt(wq, wq->cc);
 218 }
 219
 220 static inline void mlx5_cqwq_pop(struct mlx5_cqwq *wq)
 221 {
 222         wq->cc++;
 223 }
 224
 225 static inline void mlx5_cqwq_update_db_record(struct mlx5_cqwq *wq)
 226 {
 227         *wq->db = cpu_to_be32(wq->cc & 0xffffff);
 228 }
 229
 230 static inline struct mlx5_cqe64 *mlx5_cqwq_get_cqe(struct mlx5_cqwq *wq)
 231 {
 232         u32 ci = mlx5_cqwq_get_ci(wq);
 233         struct mlx5_cqe64 *cqe = mlx5_cqwq_get_wqe(wq, ci);
 234         u8 cqe_ownership_bit = cqe->op_own & MLX5_CQE_OWNER_MASK;
 235         u8 sw_ownership_val = mlx5_cqwq_get_wrap_cnt(wq) & 1;
 236
 237         if (cqe_ownership_bit != sw_ownership_val)
 238                 return NULL;
 239
 240         /* ensure cqe content is read after cqe ownership bit */
 241         dma_rmb();
 242
 243         return cqe;
 244 }
 245
 246 static inline u32 mlx5_wq_ll_get_size(struct mlx5_wq_ll *wq)
 247 {
 248         return (u32)wq->fbc.sz_m1 + 1;
 249 }
 250
 251 static inline int mlx5_wq_ll_is_full(struct mlx5_wq_ll *wq)
 252 {
 253         return wq->cur_sz == wq->fbc.sz_m1;
 254 }
 255
 256 static inline int mlx5_wq_ll_is_empty(struct mlx5_wq_ll *wq)
 257 {
 258         return !wq->cur_sz;
 259 }
 260
 261 static inline int mlx5_wq_ll_missing(struct mlx5_wq_ll *wq)
 262 {
 263         return wq->fbc.sz_m1 - wq->cur_sz;
 264 }
 265
 266 static inline void *mlx5_wq_ll_get_wqe(struct mlx5_wq_ll *wq, u16 ix)
 267 {
 268         return mlx5_frag_buf_get_wqe(&wq->fbc, ix);
 269 }
 270
 271 static inline u16 mlx5_wq_ll_get_wqe_next_ix(struct mlx5_wq_ll *wq, u16 ix)
 272 {
 273         struct mlx5_wqe_srq_next_seg *wqe = mlx5_wq_ll_get_wqe(wq, ix);
 274
 275         return be16_to_cpu(wqe->next_wqe_index);
 276 }
 277
 278 static inline void mlx5_wq_ll_push(struct mlx5_wq_ll *wq, u16 head_next)
 279 {
 280         wq->head = head_next;
 281         wq->wqe_ctr++;
 282         wq->cur_sz++;
 283 }
 284
 285 static inline void mlx5_wq_ll_pop(struct mlx5_wq_ll *wq, __be16 ix,
 286                                   __be16 *next_tail_next)
 287 {
 288         *wq->tail_next = ix;
 289         wq->tail_next = next_tail_next;
 290         wq->cur_sz--;
 291 }
 292
 293 static inline void mlx5_wq_ll_update_db_record(struct mlx5_wq_ll *wq)
 294 {
 295         *wq->db = cpu_to_be32(wq->wqe_ctr);
 296 }
 297
 298 static inline u16 mlx5_wq_ll_get_head(struct mlx5_wq_ll *wq)
 299 {
 300         return wq->head;
 301 }
 302
 303 static inline u16 mlx5_wq_ll_get_counter(struct mlx5_wq_ll *wq)
 304 {
 305         return wq->wqe_ctr;
 306 }
 307
 308 #endif /* __MLX5_WQ_H__ */