LXR linux/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
  38struct mlx5_wq_param {
  39        int             linear;
  40        int             buf_numa_node;
  41        int             db_numa_node;
  42};
  43
  44struct mlx5_wq_ctrl {
  45        struct mlx5_core_dev    *mdev;
  46        struct mlx5_buf         buf;
  47        struct mlx5_db          db;
  48};
  49
  50struct mlx5_frag_wq_ctrl {
  51        struct mlx5_core_dev    *mdev;
  52        struct mlx5_frag_buf    frag_buf;
  53        struct mlx5_db          db;
  54};
  55
  56struct mlx5_wq_cyc {
  57        void                    *buf;
  58        __be32                  *db;
  59        u16                     sz_m1;
  60        u8                      log_stride;
  61};
  62
  63struct mlx5_cqwq {
  64        struct mlx5_frag_buf    frag_buf;
  65        __be32                  *db;
  66        u32                     sz_m1;
  67        u32                     frag_sz_m1;
  68        u32                     cc; /* consumer counter */
  69        u8                      log_sz;
  70        u8                      log_stride;
  71        u8                      log_frag_strides;
  72};
  73
  74struct mlx5_wq_ll {
  75        void                    *buf;
  76        __be32                  *db;
  77        __be16                  *tail_next;
  78        u16                     sz_m1;
  79        u16                     head;
  80        u16                     wqe_ctr;
  81        u16                     cur_sz;
  82        u8                      log_stride;
  83};
  84
  85int mlx5_wq_cyc_create(struct mlx5_core_dev *mdev, struct mlx5_wq_param *param,
  86                       void *wqc, struct mlx5_wq_cyc *wq,
  87                       struct mlx5_wq_ctrl *wq_ctrl);
  88u32 mlx5_wq_cyc_get_size(struct mlx5_wq_cyc *wq);
  89
  90int mlx5_cqwq_create(struct mlx5_core_dev *mdev, struct mlx5_wq_param *param,
  91                     void *cqc, struct mlx5_cqwq *wq,
  92                     struct mlx5_frag_wq_ctrl *wq_ctrl);
  93u32 mlx5_cqwq_get_size(struct mlx5_cqwq *wq);
  94
  95int mlx5_wq_ll_create(struct mlx5_core_dev *mdev, struct mlx5_wq_param *param,
  96                      void *wqc, struct mlx5_wq_ll *wq,
  97                      struct mlx5_wq_ctrl *wq_ctrl);
  98u32 mlx5_wq_ll_get_size(struct mlx5_wq_ll *wq);
  99
 100void mlx5_wq_destroy(struct mlx5_wq_ctrl *wq_ctrl);
 101void mlx5_cqwq_destroy(struct mlx5_frag_wq_ctrl *wq_ctrl);
 102
 103static inline u16 mlx5_wq_cyc_ctr2ix(struct mlx5_wq_cyc *wq, u16 ctr)
 104{
 105        return ctr & wq->sz_m1;
 106}
 107
 108static inline void *mlx5_wq_cyc_get_wqe(struct mlx5_wq_cyc *wq, u16 ix)
 109{
 110        return wq->buf + (ix << wq->log_stride);
 111}
 112
 113static inline int mlx5_wq_cyc_cc_bigger(u16 cc1, u16 cc2)
 114{
 115        int equal   = (cc1 == cc2);
 116        int smaller = 0x8000 & (cc1 - cc2);
 117
 118        return !equal && !smaller;
 119}
 120
 121static inline u32 mlx5_cqwq_get_ci(struct mlx5_cqwq *wq)
 122{
 123        return wq->cc & wq->sz_m1;
 124}
 125
 126static inline void *mlx5_cqwq_get_wqe(struct mlx5_cqwq *wq, u32 ix)
 127{
 128        unsigned int frag = (ix >> wq->log_frag_strides);
 129
 130        return wq->frag_buf.frags[frag].buf +
 131                ((wq->frag_sz_m1 & ix) << wq->log_stride);
 132}
 133
 134static inline u32 mlx5_cqwq_get_wrap_cnt(struct mlx5_cqwq *wq)
 135{
 136        return wq->cc >> wq->log_sz;
 137}
 138
 139static inline void mlx5_cqwq_pop(struct mlx5_cqwq *wq)
 140{
 141        wq->cc++;
 142}
 143
 144static inline void mlx5_cqwq_update_db_record(struct mlx5_cqwq *wq)
 145{
 146        *wq->db = cpu_to_be32(wq->cc & 0xffffff);
 147}
 148
 149static inline int mlx5_wq_ll_is_full(struct mlx5_wq_ll *wq)
 150{
 151        return wq->cur_sz == wq->sz_m1;
 152}
 153
 154static inline int mlx5_wq_ll_is_empty(struct mlx5_wq_ll *wq)
 155{
 156        return !wq->cur_sz;
 157}
 158
 159static inline void *mlx5_wq_ll_get_wqe(struct mlx5_wq_ll *wq, u16 ix)
 160{
 161        return wq->buf + (ix << wq->log_stride);
 162}
 163
 164static inline void mlx5_wq_ll_push(struct mlx5_wq_ll *wq, u16 head_next)
 165{
 166        wq->head = head_next;
 167        wq->wqe_ctr++;
 168        wq->cur_sz++;
 169}
 170
 171static inline void mlx5_wq_ll_pop(struct mlx5_wq_ll *wq, __be16 ix,
 172                                  __be16 *next_tail_next)
 173{
 174        *wq->tail_next = ix;
 175        wq->tail_next = next_tail_next;
 176        wq->cur_sz--;
 177}
 178
 179static inline void mlx5_wq_ll_update_db_record(struct mlx5_wq_ll *wq)
 180{
 181        *wq->db = cpu_to_be32(wq->wqe_ctr);
 182}
 183
 184#endif /* __MLX5_WQ_H__ */
 185