drivers/net/mlx5/mlx5_rss.c

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright 2015 6WIND S.A.
   5  *   Copyright 2015 Mellanox.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following conditions
   9  *   are met:
  10  *
  11  *     * Redistributions of source code must retain the above copyright
  12  *       notice, this list of conditions and the following disclaimer.
  13  *     * Redistributions in binary form must reproduce the above copyright
  14  *       notice, this list of conditions and the following disclaimer in
  15  *       the documentation and/or other materials provided with the
  16  *       distribution.
  17  *     * Neither the name of 6WIND S.A. nor the names of its
  18  *       contributors may be used to endorse or promote products derived
  19  *       from this software without specific prior written permission.
  20  *
  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #include <stddef.h>
  35 #include <stdint.h>
  36 #include <errno.h>
  37 #include <string.h>
  38 #include <assert.h>
  39
  40 /* Verbs header. */
  41 /* ISO C doesn't support unnamed structs/unions, disabling -pedantic. */
  42 #ifdef PEDANTIC
  43 #pragma GCC diagnostic ignored "-pedantic"
  44 #endif
  45 #include <infiniband/verbs.h>
  46 #ifdef PEDANTIC
  47 #pragma GCC diagnostic error "-pedantic"
  48 #endif
  49
  50 /* DPDK headers don't like -pedantic. */
  51 #ifdef PEDANTIC
  52 #pragma GCC diagnostic ignored "-pedantic"
  53 #endif
  54 #include <rte_malloc.h>
  55 #include <rte_ethdev.h>
  56 #ifdef PEDANTIC
  57 #pragma GCC diagnostic error "-pedantic"
  58 #endif
  59
  60 #include "mlx5.h"
  61 #include "mlx5_rxtx.h"
  62
  63 /**
  64  * Get a RSS configuration hash key.
  65  *
  66  * @param priv
  67  *   Pointer to private structure.
  68  * @param rss_hf
  69  *   RSS hash functions configuration must be retrieved for.
  70  *
  71  * @return
  72  *   Pointer to a RSS configuration structure or NULL if rss_hf cannot
  73  *   be matched.
  74  */
  75 static struct rte_eth_rss_conf *
  76 rss_hash_get(struct priv *priv, uint64_t rss_hf)
  77 {
  78         unsigned int i;
  79
  80         for (i = 0; (i != hash_rxq_init_n); ++i) {
  81                 uint64_t dpdk_rss_hf = hash_rxq_init[i].dpdk_rss_hf;
  82
  83                 if (!(dpdk_rss_hf & rss_hf))
  84                         continue;
  85                 return (*priv->rss_conf)[i];
  86         }
  87         return NULL;
  88 }
  89
  90 /**
  91  * Register a RSS key.
  92  *
  93  * @param priv
  94  *   Pointer to private structure.
  95  * @param key
  96  *   Hash key to register.
  97  * @param key_len
  98  *   Hash key length in bytes.
  99  * @param rss_hf
 100  *   RSS hash functions the provided key applies to.
 101  *
 102  * @return
 103  *   0 on success, errno value on failure.
 104  */
 105 int
 106 rss_hash_rss_conf_new_key(struct priv *priv, const uint8_t *key,
 107                           unsigned int key_len, uint64_t rss_hf)
 108 {
 109         unsigned int i;
 110
 111         for (i = 0; (i != hash_rxq_init_n); ++i) {
 112                 struct rte_eth_rss_conf *rss_conf;
 113                 uint64_t dpdk_rss_hf = hash_rxq_init[i].dpdk_rss_hf;
 114
 115                 if (!(dpdk_rss_hf & rss_hf))
 116                         continue;
 117                 rss_conf = rte_realloc((*priv->rss_conf)[i],
 118                                        (sizeof(*rss_conf) + key_len),
 119                                        0);
 120                 if (!rss_conf)
 121                         return ENOMEM;
 122                 rss_conf->rss_key = (void *)(rss_conf + 1);
 123                 rss_conf->rss_key_len = key_len;
 124                 rss_conf->rss_hf = dpdk_rss_hf;
 125                 memcpy(rss_conf->rss_key, key, key_len);
 126                 (*priv->rss_conf)[i] = rss_conf;
 127         }
 128         return 0;
 129 }
 130
 131 /**
 132  * DPDK callback to update the RSS hash configuration.
 133  *
 134  * @param dev
 135  *   Pointer to Ethernet device structure.
 136  * @param[in] rss_conf
 137  *   RSS configuration data.
 138  *
 139  * @return
 140  *   0 on success, negative errno value on failure.
 141  */
 142 int
 143 mlx5_rss_hash_update(struct rte_eth_dev *dev,
 144                      struct rte_eth_rss_conf *rss_conf)
 145 {
 146         struct priv *priv = dev->data->dev_private;
 147         int err = 0;
 148
 149         priv_lock(priv);
 150
 151         assert(priv->rss_conf != NULL);
 152
 153         /* Apply configuration. */
 154         if (rss_conf->rss_key)
 155                 err = rss_hash_rss_conf_new_key(priv,
 156                                                 rss_conf->rss_key,
 157                                                 rss_conf->rss_key_len,
 158                                                 rss_conf->rss_hf);
 159         else
 160                 err = rss_hash_rss_conf_new_key(priv,
 161                                                 rss_hash_default_key,
 162                                                 rss_hash_default_key_len,
 163                                                 ETH_RSS_PROTO_MASK);
 164
 165         /* Store the configuration set into port configure.
 166          * This will enable/disable hash RX queues associated to the protocols
 167          * enabled/disabled by this update. */
 168         priv->dev->data->dev_conf.rx_adv_conf.rss_conf.rss_hf =
 169                 rss_conf->rss_hf;
 170         priv_unlock(priv);
 171         assert(err >= 0);
 172         return -err;
 173 }
 174
 175 /**
 176  * DPDK callback to get the RSS hash configuration.
 177  *
 178  * @param dev
 179  *   Pointer to Ethernet device structure.
 180  * @param[in, out] rss_conf
 181  *   RSS configuration data.
 182  *
 183  * @return
 184  *   0 on success, negative errno value on failure.
 185  */
 186 int
 187 mlx5_rss_hash_conf_get(struct rte_eth_dev *dev,
 188                        struct rte_eth_rss_conf *rss_conf)
 189 {
 190         struct priv *priv = dev->data->dev_private;
 191         struct rte_eth_rss_conf *priv_rss_conf;
 192
 193         priv_lock(priv);
 194
 195         assert(priv->rss_conf != NULL);
 196
 197         priv_rss_conf = rss_hash_get(priv, rss_conf->rss_hf);
 198         if (!priv_rss_conf) {
 199                 rss_conf->rss_hf = 0;
 200                 priv_unlock(priv);
 201                 return -EINVAL;
 202         }
 203         if (rss_conf->rss_key &&
 204             rss_conf->rss_key_len >= priv_rss_conf->rss_key_len)
 205                 memcpy(rss_conf->rss_key,
 206                        priv_rss_conf->rss_key,
 207                        priv_rss_conf->rss_key_len);
 208         rss_conf->rss_key_len = priv_rss_conf->rss_key_len;
 209         rss_conf->rss_hf = priv_rss_conf->rss_hf;
 210
 211         priv_unlock(priv);
 212         return 0;
 213 }