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 {
  79         struct mlx4_en_dev *mdev = priv->mdev;
  80         int err = 0;
  81         char name[25];
  82
  83         cq->dev = mdev->pndev[priv->port];
  84         cq->mcq.set_ci_db  = cq->wqres.db.db;
  85         cq->mcq.arm_db     = cq->wqres.db.db + 1;
  86         *cq->mcq.set_ci_db = 0;
  87         *cq->mcq.arm_db    = 0;
  88         memset(cq->buf, 0, cq->buf_size);
  89
  90         if (cq->is_tx == RX) {
  91                 if (mdev->dev->caps.comp_pool) {
  92                         if (!cq->vector) {
  93                                 sprintf(name , "%s-rx-%d", priv->dev->name, cq->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_rx-%d ,Falling back to legacy EQ's\n",
  99                                                   priv->dev->name, cq->ring);
 100                                 }
 101                         }
 102                 } else {
 103                         cq->vector = (cq->ring + 1 + priv->port) %
 104                                 mdev->dev->caps.num_comp_vectors;
 105                 }
 106         } else {
 107                 if (!cq->vector || !mdev->dev->caps.comp_pool) {
 108                         /*Fallback to legacy pool in case of error*/
 109                         cq->vector   = 0;
 110                 }
 111         }
 112
 113         if (!cq->is_tx)
 114                 cq->size = priv->rx_ring[cq->ring].actual_size;
 115
 116         err = mlx4_cq_alloc(mdev->dev, cq->size, &cq->wqres.mtt, &mdev->priv_uar,
 117                             cq->wqres.db.dma, &cq->mcq, cq->vector, cq->is_tx);
 118         if (err)
 119                 return err;
 120
 121         cq->mcq.comp  = cq->is_tx ? mlx4_en_tx_irq : mlx4_en_rx_irq;
 122         cq->mcq.event = mlx4_en_cq_event;
 123
 124         if (cq->is_tx) {
 125                 init_timer(&cq->timer);
 126                 cq->timer.function = mlx4_en_poll_tx_cq;
 127                 cq->timer.data = (unsigned long) cq;
 128         } else {
 129                 netif_napi_add(cq->dev, &cq->napi, mlx4_en_poll_rx_cq, 64);
 130                 napi_enable(&cq->napi);
 131         }
 132
 133         return 0;
 134 }
 135
 136 void mlx4_en_destroy_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq,
 137                         bool reserve_vectors)
 138 {
 139         struct mlx4_en_dev *mdev = priv->mdev;
 140
 141         mlx4_en_unmap_buffer(&cq->wqres.buf);
 142         mlx4_free_hwq_res(mdev->dev, &cq->wqres, cq->buf_size);
 143         if (priv->mdev->dev->caps.comp_pool && cq->vector && !reserve_vectors)
 144                 mlx4_release_eq(priv->mdev->dev, cq->vector);
 145         cq->buf_size = 0;
 146         cq->buf = NULL;
 147 }
 148
 149 void mlx4_en_deactivate_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq)
 150 {
 151         struct mlx4_en_dev *mdev = priv->mdev;
 152
 153         if (cq->is_tx)
 154                 del_timer(&cq->timer);
 155         else {
 156                 napi_disable(&cq->napi);
 157                 netif_napi_del(&cq->napi);
 158         }
 159
 160         mlx4_cq_free(mdev->dev, &cq->mcq);
 161 }
 162
 163 /* Set rx cq moderation parameters */
 164 int mlx4_en_set_cq_moder(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq)
 165 {
 166         return mlx4_cq_modify(priv->mdev->dev, &cq->mcq,
 167                               cq->moder_cnt, cq->moder_time);
 168 }
 169
 170 int mlx4_en_arm_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq)
 171 {
 172         mlx4_cq_arm(&cq->mcq, MLX4_CQ_DB_REQ_NOT, priv->mdev->uar_map,
 173                     &priv->mdev->uar_lock);
 174
 175         return 0;
 176 }
 177
 178