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