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 **pcq,
  48                       int entries, int ring, enum cq_type mode,
  49                       int node)
  50 {
  51         struct mlx4_en_dev *mdev = priv->mdev;
  52         struct mlx4_en_cq *cq;
  53         int err;
  54
  55         cq = kzalloc_node(sizeof(*cq), GFP_KERNEL, node);
  56         if (!cq) {
  57                 cq = kzalloc(sizeof(*cq), GFP_KERNEL);
  58                 if (!cq) {
  59                         en_err(priv, "Failed to allocate CQ structure\n");
  60                         return -ENOMEM;
  61                 }
  62         }
  63
  64         cq->size = entries;
  65         cq->buf_size = cq->size * mdev->dev->caps.cqe_size;
  66
  67         cq->ring = ring;
  68         cq->is_tx = mode;
  69         cq->vector = mdev->dev->caps.num_comp_vectors;
  70
  71         /* Allocate HW buffers on provided NUMA node.
  72          * dev->numa_node is used in mtt range allocation flow.
  73          */
  74         set_dev_node(&mdev->dev->persist->pdev->dev, node);
  75         err = mlx4_alloc_hwq_res(mdev->dev, &cq->wqres,
  76                                 cq->buf_size);
  77         set_dev_node(&mdev->dev->persist->pdev->dev, mdev->dev->numa_node);
  78         if (err)
  79                 goto err_cq;
  80
  81         cq->buf = (struct mlx4_cqe *)cq->wqres.buf.direct.buf;
  82         *pcq = cq;
  83
  84         return 0;
  85
  86 err_cq:
  87         kfree(cq);
  88         *pcq = NULL;
  89         return err;
  90 }
  91
  92 int mlx4_en_activate_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq,
  93                         int cq_idx)
  94 {
  95         struct mlx4_en_dev *mdev = priv->mdev;
  96         int err = 0;
  97         int timestamp_en = 0;
  98         bool assigned_eq = false;
  99
 100         cq->dev = mdev->pndev[priv->port];
 101         cq->mcq.set_ci_db  = cq->wqres.db.db;
 102         cq->mcq.arm_db     = cq->wqres.db.db + 1;
 103         *cq->mcq.set_ci_db = 0;
 104         *cq->mcq.arm_db    = 0;
 105         memset(cq->buf, 0, cq->buf_size);
 106
 107         if (cq->is_tx == RX) {
 108                 if (!mlx4_is_eq_vector_valid(mdev->dev, priv->port,
 109                                              cq->vector)) {
 110                         cq->vector = cpumask_first(priv->rx_ring[cq->ring]->affinity_mask);
 111
 112                         err = mlx4_assign_eq(mdev->dev, priv->port,
 113                                              &cq->vector);
 114                         if (err) {
 115                                 mlx4_err(mdev, "Failed assigning an EQ to CQ vector %d\n",
 116                                          cq->vector);
 117                                 goto free_eq;
 118                         }
 119
 120                         assigned_eq = true;
 121                 }
 122
 123                 cq->irq_desc =
 124                         irq_to_desc(mlx4_eq_get_irq(mdev->dev,
 125                                                     cq->vector));
 126         } else {
 127                 /* For TX we use the same irq per
 128                 ring we assigned for the RX    */
 129                 struct mlx4_en_cq *rx_cq;
 130                 int xdp_index;
 131
 132                 /* The xdp tx irq must align with the rx ring that forwards to
 133                  * it, so reindex these from 0. This should only happen when
 134                  * tx_ring_num is not a multiple of rx_ring_num.
 135                  */
 136                 xdp_index = (priv->xdp_ring_num - priv->tx_ring_num) + cq_idx;
 137                 if (xdp_index >= 0)
 138                         cq_idx = xdp_index;
 139                 cq_idx = cq_idx % priv->rx_ring_num;
 140                 rx_cq = priv->rx_cq[cq_idx];
 141                 cq->vector = rx_cq->vector;
 142         }
 143
 144         if (!cq->is_tx)
 145                 cq->size = priv->rx_ring[cq->ring]->actual_size;
 146
 147         if ((cq->is_tx && priv->hwtstamp_config.tx_type) ||
 148             (!cq->is_tx && priv->hwtstamp_config.rx_filter))
 149                 timestamp_en = 1;
 150
 151         err = mlx4_cq_alloc(mdev->dev, cq->size, &cq->wqres.mtt,
 152                             &mdev->priv_uar, cq->wqres.db.dma, &cq->mcq,
 153                             cq->vector, 0, timestamp_en);
 154         if (err)
 155                 goto free_eq;
 156
 157         cq->mcq.comp  = cq->is_tx ? mlx4_en_tx_irq : mlx4_en_rx_irq;
 158         cq->mcq.event = mlx4_en_cq_event;
 159
 160         if (cq->is_tx)
 161                 netif_tx_napi_add(cq->dev, &cq->napi, mlx4_en_poll_tx_cq,
 162                                   NAPI_POLL_WEIGHT);
 163         else
 164                 netif_napi_add(cq->dev, &cq->napi, mlx4_en_poll_rx_cq, 64);
 165
 166         napi_enable(&cq->napi);
 167
 168         return 0;
 169
 170 free_eq:
 171         if (assigned_eq)
 172                 mlx4_release_eq(mdev->dev, cq->vector);
 173         cq->vector = mdev->dev->caps.num_comp_vectors;
 174         return err;
 175 }
 176
 177 void mlx4_en_destroy_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq **pcq)
 178 {
 179         struct mlx4_en_dev *mdev = priv->mdev;
 180         struct mlx4_en_cq *cq = *pcq;
 181
 182         mlx4_free_hwq_res(mdev->dev, &cq->wqres, cq->buf_size);
 183         if (mlx4_is_eq_vector_valid(mdev->dev, priv->port, cq->vector) &&
 184             cq->is_tx == RX)
 185                 mlx4_release_eq(priv->mdev->dev, cq->vector);
 186         cq->vector = 0;
 187         cq->buf_size = 0;
 188         cq->buf = NULL;
 189         kfree(cq);
 190         *pcq = NULL;
 191 }
 192
 193 void mlx4_en_deactivate_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq)
 194 {
 195         napi_disable(&cq->napi);
 196         if (!cq->is_tx) {
 197                 napi_hash_del(&cq->napi);
 198                 synchronize_rcu();
 199         }
 200         netif_napi_del(&cq->napi);
 201
 202         mlx4_cq_free(priv->mdev->dev, &cq->mcq);
 203 }
 204
 205 /* Set rx cq moderation parameters */
 206 int mlx4_en_set_cq_moder(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq)
 207 {
 208         return mlx4_cq_modify(priv->mdev->dev, &cq->mcq,
 209                               cq->moder_cnt, cq->moder_time);
 210 }
 211
 212 int mlx4_en_arm_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq)
 213 {
 214         mlx4_cq_arm(&cq->mcq, MLX4_CQ_DB_REQ_NOT, priv->mdev->uar_map,
 215                     &priv->mdev->uar_lock);
 216
 217         return 0;
 218 }
 219
 220