drivers/net/ethernet/mellanox/mlx4/en_cq.c

   1 /*
   2  * Copyright (c) 2007 Mellanox Technologies. 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
  34 #include <linux/mlx4/cq.h>
  35 #include <linux/mlx4/qp.h>
  36 #include <linux/mlx4/cmd.h>
  37
  38 #include "mlx4_en.h"
  39
  40 static void mlx4_en_cq_event(struct mlx4_cq *cq, enum mlx4_event event)
  41 {
  42         return;
  43 }
  44
  45
  46 int mlx4_en_create_cq(struct mlx4_en_priv *priv,
  47                       struct mlx4_en_cq *cq,
  48                       int entries, int ring, enum cq_type mode)
  49 {
  50         struct mlx4_en_dev *mdev = priv->mdev;
  51         int err;
  52
  53         cq->size = entries;
  54         if (mode == RX)
  55                 cq->buf_size = cq->size * sizeof(struct mlx4_cqe);
  56         else
  57                 cq->buf_size = sizeof(struct mlx4_cqe);
  58
  59         cq->ring = ring;
  60         cq->is_tx = mode;
  61         spin_lock_init(&cq->lock);
  62
  63         err = mlx4_alloc_hwq_res(mdev->dev, &cq->wqres,
  64                                 cq->buf_size, 2 * PAGE_SIZE);
  65         if (err)
  66                 return err;
  67
  68         err = mlx4_en_map_buffer(&cq->wqres.buf);
  69         if (err)
  70                 mlx4_free_hwq_res(mdev->dev, &cq->wqres, cq->buf_size);
  71         else
  72                 cq->buf = (struct mlx4_cqe *) cq->wqres.buf.direct.buf;
  73
  74         return err;
  75 }
  76
  77 int mlx4_en_activate_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq,
  78                         int cq_idx)
  79 {
  80         struct mlx4_en_dev *mdev = priv->mdev;
  81         int err = 0;
  82         char name[25];
  83
  84         cq->dev = mdev->pndev[priv->port];
  85         cq->mcq.set_ci_db  = cq->wqres.db.db;
  86         cq->mcq.arm_db     = cq->wqres.db.db + 1;
  87         *cq->mcq.set_ci_db = 0;
  88         *cq->mcq.arm_db    = 0;
  89         memset(cq->buf, 0, cq->buf_size);
  90
  91         if (cq->is_tx == RX) {
  92                 if (mdev->dev->caps.comp_pool) {
  93                         if (!cq->vector) {
  94                                 sprintf(name, "%s-%d", priv->dev->name,
  95                                         cq->ring);
  96                                 /* Set IRQ for specific name (per ring) */
  97                                 if (mlx4_assign_eq(mdev->dev, name, &cq->vector)) {
  98                                         cq->vector = (cq->ring + 1 + priv->port)
  99                                             % mdev->dev->caps.num_comp_vectors;
 100                                         mlx4_warn(mdev, "Failed Assigning an EQ to "
 101                                                   "%s ,Falling back to legacy EQ's\n",
 102                                                   name);
 103                                 }
 104                         }
 105                 } else {
 106                         cq->vector = (cq->ring + 1 + priv->port) %
 107                                 mdev->dev->caps.num_comp_vectors;
 108                 }
 109         } else {
 110                 /* For TX we use the same irq per
 111                 ring we assigned for the RX    */
 112                 struct mlx4_en_cq *rx_cq;
 113
 114                 cq_idx = cq_idx % priv->rx_ring_num;
 115                 rx_cq = &priv->rx_cq[cq_idx];
 116                 cq->vector = rx_cq->vector;
 117         }
 118
 119         if (!cq->is_tx)
 120                 cq->size = priv->rx_ring[cq->ring].actual_size;
 121
 122         err = mlx4_cq_alloc(mdev->dev, cq->size, &cq->wqres.mtt, &mdev->priv_uar,
 123                             cq->wqres.db.dma, &cq->mcq, cq->vector, cq->is_tx);
 124         if (err)
 125                 return err;
 126
 127         cq->mcq.comp  = cq->is_tx ? mlx4_en_tx_irq : mlx4_en_rx_irq;
 128         cq->mcq.event = mlx4_en_cq_event;
 129
 130         if (cq->is_tx) {
 131                 init_timer(&cq->timer);
 132                 cq->timer.function = mlx4_en_poll_tx_cq;
 133                 cq->timer.data = (unsigned long) cq;
 134         } else {
 135                 netif_napi_add(cq->dev, &cq->napi, mlx4_en_poll_rx_cq, 64);
 136                 napi_enable(&cq->napi);
 137         }
 138
 139         return 0;
 140 }
 141
 142 void mlx4_en_destroy_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq)
 143 {
 144         struct mlx4_en_dev *mdev = priv->mdev;
 145
 146         mlx4_en_unmap_buffer(&cq->wqres.buf);
 147         mlx4_free_hwq_res(mdev->dev, &cq->wqres, cq->buf_size);
 148         if (priv->mdev->dev->caps.comp_pool && cq->vector)
 149                 mlx4_release_eq(priv->mdev->dev, cq->vector);
 150         cq->buf_size = 0;
 151         cq->buf = NULL;
 152 }
 153
 154 void mlx4_en_deactivate_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq)
 155 {
 156         struct mlx4_en_dev *mdev = priv->mdev;
 157
 158         if (cq->is_tx)
 159                 del_timer(&cq->timer);
 160         else {
 161                 napi_disable(&cq->napi);
 162                 netif_napi_del(&cq->napi);
 163         }
 164
 165         mlx4_cq_free(mdev->dev, &cq->mcq);
 166 }
 167
 168 /* Set rx cq moderation parameters */
 169 int mlx4_en_set_cq_moder(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq)
 170 {
 171         return mlx4_cq_modify(priv->mdev->dev, &cq->mcq,
 172                               cq->moder_cnt, cq->moder_time);
 173 }
 174
 175 int mlx4_en_arm_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq)
 176 {
 177         mlx4_cq_arm(&cq->mcq, MLX4_CQ_DB_REQ_NOT, priv->mdev->uar_map,
 178                     &priv->mdev->uar_lock);
 179
 180         return 0;
 181 }
 182
 183