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
  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
  94 static inline u16 mlx5_wq_cyc_ctr2ix(struct mlx5_wq_cyc *wq, u16 ctr)
  95 {
  96         return ctr & wq->sz_m1;
  97 }
  98
  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
 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
 112 static inline u32 mlx5_cqwq_get_ci(struct mlx5_cqwq *wq)
 113 {
 114         return wq->cc & wq->sz_m1;
 115 }
 116
 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
 122 static inline u32 mlx5_cqwq_get_wrap_cnt(struct mlx5_cqwq *wq)
 123 {
 124         return wq->cc >> wq->log_sz;
 125 }
 126
 127 static inline void mlx5_cqwq_pop(struct mlx5_cqwq *wq)
 128 {
 129         wq->cc++;
 130 }
 131
 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
 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
 142 static inline int mlx5_wq_ll_is_empty(struct mlx5_wq_ll *wq)
 143 {
 144         return !wq->cur_sz;
 145 }
 146
 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
 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
 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
 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__ */