ceph/src/seastar/dpdk/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 "-Wpedantic"
  44 #endif
  45 #include <infiniband/verbs.h>
  46 #ifdef PEDANTIC
  47 #pragma GCC diagnostic error "-Wpedantic"
  48 #endif
  49
  50 /* DPDK headers don't like -pedantic. */
  51 #ifdef PEDANTIC
  52 #pragma GCC diagnostic ignored "-Wpedantic"
  53 #endif
  54 #include <rte_malloc.h>
  55 #include <rte_ethdev.h>
  56 #ifdef PEDANTIC
  57 #pragma GCC diagnostic error "-Wpedantic"
  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         /* Store protocols for which RSS is enabled. */
 160         priv->rss_hf = rss_conf->rss_hf;
 161         priv_unlock(priv);
 162         assert(err >= 0);
 163         return -err;
 164 }
 165
 166 /**
 167  * DPDK callback to get the RSS hash configuration.
 168  *
 169  * @param dev
 170  *   Pointer to Ethernet device structure.
 171  * @param[in, out] rss_conf
 172  *   RSS configuration data.
 173  *
 174  * @return
 175  *   0 on success, negative errno value on failure.
 176  */
 177 int
 178 mlx5_rss_hash_conf_get(struct rte_eth_dev *dev,
 179                        struct rte_eth_rss_conf *rss_conf)
 180 {
 181         struct priv *priv = dev->data->dev_private;
 182         struct rte_eth_rss_conf *priv_rss_conf;
 183
 184         priv_lock(priv);
 185
 186         assert(priv->rss_conf != NULL);
 187
 188         priv_rss_conf = rss_hash_get(priv, rss_conf->rss_hf);
 189         if (!priv_rss_conf) {
 190                 rss_conf->rss_hf = 0;
 191                 priv_unlock(priv);
 192                 return -EINVAL;
 193         }
 194         if (rss_conf->rss_key &&
 195             rss_conf->rss_key_len >= priv_rss_conf->rss_key_len)
 196                 memcpy(rss_conf->rss_key,
 197                        priv_rss_conf->rss_key,
 198                        priv_rss_conf->rss_key_len);
 199         rss_conf->rss_key_len = priv_rss_conf->rss_key_len;
 200         rss_conf->rss_hf = priv_rss_conf->rss_hf;
 201
 202         priv_unlock(priv);
 203         return 0;
 204 }
 205
 206 /**
 207  * Allocate/reallocate RETA index table.
 208  *
 209  * @param priv
 210  *   Pointer to private structure.
 211  * @praram reta_size
 212  *   The size of the array to allocate.
 213  *
 214  * @return
 215  *   0 on success, errno value on failure.
 216  */
 217 int
 218 priv_rss_reta_index_resize(struct priv *priv, unsigned int reta_size)
 219 {
 220         void *mem;
 221         unsigned int old_size = priv->reta_idx_n;
 222
 223         if (priv->reta_idx_n == reta_size)
 224                 return 0;
 225
 226         mem = rte_realloc(priv->reta_idx,
 227                           reta_size * sizeof((*priv->reta_idx)[0]), 0);
 228         if (!mem)
 229                 return ENOMEM;
 230         priv->reta_idx = mem;
 231         priv->reta_idx_n = reta_size;
 232
 233         if (old_size < reta_size)
 234                 memset(&(*priv->reta_idx)[old_size], 0,
 235                        (reta_size - old_size) *
 236                        sizeof((*priv->reta_idx)[0]));
 237         return 0;
 238 }
 239
 240 /**
 241  * Query RETA table.
 242  *
 243  * @param priv
 244  *   Pointer to private structure.
 245  * @param[in, out] reta_conf
 246  *   Pointer to the first RETA configuration structure.
 247  * @param reta_size
 248  *   Number of entries.
 249  *
 250  * @return
 251  *   0 on success, errno value on failure.
 252  */
 253 static int
 254 priv_dev_rss_reta_query(struct priv *priv,
 255                         struct rte_eth_rss_reta_entry64 *reta_conf,
 256                         unsigned int reta_size)
 257 {
 258         unsigned int idx;
 259         unsigned int i;
 260
 261         if (!reta_size || reta_size > priv->reta_idx_n)
 262                 return EINVAL;
 263         /* Fill each entry of the table even if its bit is not set. */
 264         for (idx = 0, i = 0; (i != reta_size); ++i) {
 265                 idx = i / RTE_RETA_GROUP_SIZE;
 266                 reta_conf[idx].reta[i % RTE_RETA_GROUP_SIZE] =
 267                         (*priv->reta_idx)[i];
 268         }
 269         return 0;
 270 }
 271
 272 /**
 273  * Update RETA table.
 274  *
 275  * @param priv
 276  *   Pointer to private structure.
 277  * @param[in] reta_conf
 278  *   Pointer to the first RETA configuration structure.
 279  * @param reta_size
 280  *   Number of entries.
 281  *
 282  * @return
 283  *   0 on success, errno value on failure.
 284  */
 285 static int
 286 priv_dev_rss_reta_update(struct priv *priv,
 287                          struct rte_eth_rss_reta_entry64 *reta_conf,
 288                          unsigned int reta_size)
 289 {
 290         unsigned int idx;
 291         unsigned int i;
 292         unsigned int pos;
 293         int ret;
 294
 295         if (!reta_size)
 296                 return EINVAL;
 297         ret = priv_rss_reta_index_resize(priv, reta_size);
 298         if (ret)
 299                 return ret;
 300
 301         for (idx = 0, i = 0; (i != reta_size); ++i) {
 302                 idx = i / RTE_RETA_GROUP_SIZE;
 303                 pos = i % RTE_RETA_GROUP_SIZE;
 304                 if (((reta_conf[idx].mask >> i) & 0x1) == 0)
 305                         continue;
 306                 assert(reta_conf[idx].reta[pos] < priv->rxqs_n);
 307                 (*priv->reta_idx)[i] = reta_conf[idx].reta[pos];
 308         }
 309         return 0;
 310 }
 311
 312 /**
 313  * DPDK callback to get the RETA indirection table.
 314  *
 315  * @param dev
 316  *   Pointer to Ethernet device structure.
 317  * @param reta_conf
 318  *   Pointer to RETA configuration structure array.
 319  * @param reta_size
 320  *   Size of the RETA table.
 321  *
 322  * @return
 323  *   0 on success, negative errno value on failure.
 324  */
 325 int
 326 mlx5_dev_rss_reta_query(struct rte_eth_dev *dev,
 327                         struct rte_eth_rss_reta_entry64 *reta_conf,
 328                         uint16_t reta_size)
 329 {
 330         int ret;
 331         struct priv *priv = dev->data->dev_private;
 332
 333         priv_lock(priv);
 334         ret = priv_dev_rss_reta_query(priv, reta_conf, reta_size);
 335         priv_unlock(priv);
 336         return -ret;
 337 }
 338
 339 /**
 340  * DPDK callback to update the RETA indirection table.
 341  *
 342  * @param dev
 343  *   Pointer to Ethernet device structure.
 344  * @param reta_conf
 345  *   Pointer to RETA configuration structure array.
 346  * @param reta_size
 347  *   Size of the RETA table.
 348  *
 349  * @return
 350  *   0 on success, negative errno value on failure.
 351  */
 352 int
 353 mlx5_dev_rss_reta_update(struct rte_eth_dev *dev,
 354                          struct rte_eth_rss_reta_entry64 *reta_conf,
 355                          uint16_t reta_size)
 356 {
 357         int ret;
 358         struct priv *priv = dev->data->dev_private;
 359
 360         mlx5_dev_stop(dev);
 361         priv_lock(priv);
 362         ret = priv_dev_rss_reta_update(priv, reta_conf, reta_size);
 363         priv_unlock(priv);
 364         if (ret)
 365                 return -ret;
 366         return mlx5_dev_start(dev);
 367 }