drivers/net/ethernet/mellanox/mlx5/core/en_arfs.c

   1 /*
   2  * Copyright (c) 2016, 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 #include <linux/hash.h>
  34 #include <linux/mlx5/fs.h>
  35 #include <linux/ip.h>
  36 #include <linux/ipv6.h>
  37 #include "en.h"
  38
  39 struct arfs_tuple {
  40         __be16 etype;
  41         u8     ip_proto;
  42         union {
  43                 __be32 src_ipv4;
  44                 struct in6_addr src_ipv6;
  45         };
  46         union {
  47                 __be32 dst_ipv4;
  48                 struct in6_addr dst_ipv6;
  49         };
  50         __be16 src_port;
  51         __be16 dst_port;
  52 };
  53
  54 struct arfs_rule {
  55         struct mlx5e_priv       *priv;
  56         struct work_struct      arfs_work;
  57         struct mlx5_flow_handle *rule;
  58         struct hlist_node       hlist;
  59         int                     rxq;
  60         /* Flow ID passed to ndo_rx_flow_steer */
  61         int                     flow_id;
  62         /* Filter ID returned by ndo_rx_flow_steer */
  63         int                     filter_id;
  64         struct arfs_tuple       tuple;
  65 };
  66
  67 #define mlx5e_for_each_arfs_rule(hn, tmp, arfs_tables, i, j) \
  68         for (i = 0; i < ARFS_NUM_TYPES; i++) \
  69                 mlx5e_for_each_hash_arfs_rule(hn, tmp, arfs_tables[i].rules_hash, j)
  70
  71 #define mlx5e_for_each_hash_arfs_rule(hn, tmp, hash, j) \
  72         for (j = 0; j < ARFS_HASH_SIZE; j++) \
  73                 hlist_for_each_entry_safe(hn, tmp, &hash[j], hlist)
  74
  75 static enum mlx5e_traffic_types arfs_get_tt(enum arfs_type type)
  76 {
  77         switch (type) {
  78         case ARFS_IPV4_TCP:
  79                 return MLX5E_TT_IPV4_TCP;
  80         case ARFS_IPV4_UDP:
  81                 return MLX5E_TT_IPV4_UDP;
  82         case ARFS_IPV6_TCP:
  83                 return MLX5E_TT_IPV6_TCP;
  84         case ARFS_IPV6_UDP:
  85                 return MLX5E_TT_IPV6_UDP;
  86         default:
  87                 return -EINVAL;
  88         }
  89 }
  90
  91 static int arfs_disable(struct mlx5e_priv *priv)
  92 {
  93         struct mlx5_flow_destination dest = {};
  94         struct mlx5e_tir *tir = priv->indir_tir;
  95         int err = 0;
  96         int tt;
  97         int i;
  98
  99         dest.type = MLX5_FLOW_DESTINATION_TYPE_TIR;
 100         for (i = 0; i < ARFS_NUM_TYPES; i++) {
 101                 dest.tir_num = tir[i].tirn;
 102                 tt = arfs_get_tt(i);
 103                 /* Modify ttc rules destination to bypass the aRFS tables*/
 104                 err = mlx5_modify_rule_destination(priv->fs.ttc.rules[tt],
 105                                                    &dest, NULL);
 106                 if (err) {
 107                         netdev_err(priv->netdev,
 108                                    "%s: modify ttc destination failed\n",
 109                                    __func__);
 110                         return err;
 111                 }
 112         }
 113         return 0;
 114 }
 115
 116 static void arfs_del_rules(struct mlx5e_priv *priv);
 117
 118 int mlx5e_arfs_disable(struct mlx5e_priv *priv)
 119 {
 120         arfs_del_rules(priv);
 121
 122         return arfs_disable(priv);
 123 }
 124
 125 int mlx5e_arfs_enable(struct mlx5e_priv *priv)
 126 {
 127         struct mlx5_flow_destination dest = {};
 128         int err = 0;
 129         int tt;
 130         int i;
 131
 132         dest.type = MLX5_FLOW_DESTINATION_TYPE_FLOW_TABLE;
 133         for (i = 0; i < ARFS_NUM_TYPES; i++) {
 134                 dest.ft = priv->fs.arfs.arfs_tables[i].ft.t;
 135                 tt = arfs_get_tt(i);
 136                 /* Modify ttc rules destination to point on the aRFS FTs */
 137                 err = mlx5_modify_rule_destination(priv->fs.ttc.rules[tt],
 138                                                    &dest, NULL);
 139                 if (err) {
 140                         netdev_err(priv->netdev,
 141                                    "%s: modify ttc destination failed err=%d\n",
 142                                    __func__, err);
 143                         arfs_disable(priv);
 144                         return err;
 145                 }
 146         }
 147         return 0;
 148 }
 149
 150 static void arfs_destroy_table(struct arfs_table *arfs_t)
 151 {
 152         mlx5_del_flow_rules(arfs_t->default_rule);
 153         mlx5e_destroy_flow_table(&arfs_t->ft);
 154 }
 155
 156 void mlx5e_arfs_destroy_tables(struct mlx5e_priv *priv)
 157 {
 158         int i;
 159
 160         if (!(priv->netdev->hw_features & NETIF_F_NTUPLE))
 161                 return;
 162
 163         arfs_del_rules(priv);
 164         destroy_workqueue(priv->fs.arfs.wq);
 165         for (i = 0; i < ARFS_NUM_TYPES; i++) {
 166                 if (!IS_ERR_OR_NULL(priv->fs.arfs.arfs_tables[i].ft.t))
 167                         arfs_destroy_table(&priv->fs.arfs.arfs_tables[i]);
 168         }
 169 }
 170
 171 static int arfs_add_default_rule(struct mlx5e_priv *priv,
 172                                  enum arfs_type type)
 173 {
 174         struct arfs_table *arfs_t = &priv->fs.arfs.arfs_tables[type];
 175         struct mlx5e_tir *tir = priv->indir_tir;
 176         struct mlx5_flow_destination dest = {};
 177         MLX5_DECLARE_FLOW_ACT(flow_act);
 178         struct mlx5_flow_spec *spec;
 179         enum mlx5e_traffic_types tt;
 180         int err = 0;
 181
 182         spec = kvzalloc(sizeof(*spec), GFP_KERNEL);
 183         if (!spec) {
 184                 err = -ENOMEM;
 185                 goto out;
 186         }
 187
 188         dest.type = MLX5_FLOW_DESTINATION_TYPE_TIR;
 189         tt = arfs_get_tt(type);
 190         if (tt == -EINVAL) {
 191                 netdev_err(priv->netdev, "%s: bad arfs_type: %d\n",
 192                            __func__, type);
 193                 err = -EINVAL;
 194                 goto out;
 195         }
 196
 197         dest.tir_num = tir[tt].tirn;
 198
 199         arfs_t->default_rule = mlx5_add_flow_rules(arfs_t->ft.t, spec,
 200                                                    &flow_act,
 201                                                    &dest, 1);
 202         if (IS_ERR(arfs_t->default_rule)) {
 203                 err = PTR_ERR(arfs_t->default_rule);
 204                 arfs_t->default_rule = NULL;
 205                 netdev_err(priv->netdev, "%s: add rule failed, arfs type=%d\n",
 206                            __func__, type);
 207         }
 208 out:
 209         kvfree(spec);
 210         return err;
 211 }
 212
 213 #define MLX5E_ARFS_NUM_GROUPS   2
 214 #define MLX5E_ARFS_GROUP1_SIZE  (BIT(16) - 1)
 215 #define MLX5E_ARFS_GROUP2_SIZE  BIT(0)
 216 #define MLX5E_ARFS_TABLE_SIZE   (MLX5E_ARFS_GROUP1_SIZE +\
 217                                  MLX5E_ARFS_GROUP2_SIZE)
 218 static int arfs_create_groups(struct mlx5e_flow_table *ft,
 219                               enum  arfs_type type)
 220 {
 221         int inlen = MLX5_ST_SZ_BYTES(create_flow_group_in);
 222         void *outer_headers_c;
 223         int ix = 0;
 224         u32 *in;
 225         int err;
 226         u8 *mc;
 227
 228         ft->g = kcalloc(MLX5E_ARFS_NUM_GROUPS,
 229                         sizeof(*ft->g), GFP_KERNEL);
 230         in = kvzalloc(inlen, GFP_KERNEL);
 231         if  (!in || !ft->g) {
 232                 kvfree(ft->g);
 233                 kvfree(in);
 234                 return -ENOMEM;
 235         }
 236
 237         mc = MLX5_ADDR_OF(create_flow_group_in, in, match_criteria);
 238         outer_headers_c = MLX5_ADDR_OF(fte_match_param, mc,
 239                                        outer_headers);
 240         MLX5_SET_TO_ONES(fte_match_set_lyr_2_4, outer_headers_c, ethertype);
 241         switch (type) {
 242         case ARFS_IPV4_TCP:
 243         case ARFS_IPV6_TCP:
 244                 MLX5_SET_TO_ONES(fte_match_set_lyr_2_4, outer_headers_c, tcp_dport);
 245                 MLX5_SET_TO_ONES(fte_match_set_lyr_2_4, outer_headers_c, tcp_sport);
 246                 break;
 247         case ARFS_IPV4_UDP:
 248         case ARFS_IPV6_UDP:
 249                 MLX5_SET_TO_ONES(fte_match_set_lyr_2_4, outer_headers_c, udp_dport);
 250                 MLX5_SET_TO_ONES(fte_match_set_lyr_2_4, outer_headers_c, udp_sport);
 251                 break;
 252         default:
 253                 err = -EINVAL;
 254                 goto out;
 255         }
 256
 257         switch (type) {
 258         case ARFS_IPV4_TCP:
 259         case ARFS_IPV4_UDP:
 260                 MLX5_SET_TO_ONES(fte_match_set_lyr_2_4, outer_headers_c,
 261                                  src_ipv4_src_ipv6.ipv4_layout.ipv4);
 262                 MLX5_SET_TO_ONES(fte_match_set_lyr_2_4, outer_headers_c,
 263                                  dst_ipv4_dst_ipv6.ipv4_layout.ipv4);
 264                 break;
 265         case ARFS_IPV6_TCP:
 266         case ARFS_IPV6_UDP:
 267                 memset(MLX5_ADDR_OF(fte_match_set_lyr_2_4, outer_headers_c,
 268                                     src_ipv4_src_ipv6.ipv6_layout.ipv6),
 269                        0xff, 16);
 270                 memset(MLX5_ADDR_OF(fte_match_set_lyr_2_4, outer_headers_c,
 271                                     dst_ipv4_dst_ipv6.ipv6_layout.ipv6),
 272                        0xff, 16);
 273                 break;
 274         default:
 275                 err = -EINVAL;
 276                 goto out;
 277         }
 278
 279         MLX5_SET_CFG(in, match_criteria_enable, MLX5_MATCH_OUTER_HEADERS);
 280         MLX5_SET_CFG(in, start_flow_index, ix);
 281         ix += MLX5E_ARFS_GROUP1_SIZE;
 282         MLX5_SET_CFG(in, end_flow_index, ix - 1);
 283         ft->g[ft->num_groups] = mlx5_create_flow_group(ft->t, in);
 284         if (IS_ERR(ft->g[ft->num_groups]))
 285                 goto err;
 286         ft->num_groups++;
 287
 288         memset(in, 0, inlen);
 289         MLX5_SET_CFG(in, start_flow_index, ix);
 290         ix += MLX5E_ARFS_GROUP2_SIZE;
 291         MLX5_SET_CFG(in, end_flow_index, ix - 1);
 292         ft->g[ft->num_groups] = mlx5_create_flow_group(ft->t, in);
 293         if (IS_ERR(ft->g[ft->num_groups]))
 294                 goto err;
 295         ft->num_groups++;
 296
 297         kvfree(in);
 298         return 0;
 299
 300 err:
 301         err = PTR_ERR(ft->g[ft->num_groups]);
 302         ft->g[ft->num_groups] = NULL;
 303 out:
 304         kvfree(in);
 305
 306         return err;
 307 }
 308
 309 static int arfs_create_table(struct mlx5e_priv *priv,
 310                              enum arfs_type type)
 311 {
 312         struct mlx5e_arfs_tables *arfs = &priv->fs.arfs;
 313         struct mlx5e_flow_table *ft = &arfs->arfs_tables[type].ft;
 314         struct mlx5_flow_table_attr ft_attr = {};
 315         int err;
 316
 317         ft->num_groups = 0;
 318
 319         ft_attr.max_fte = MLX5E_ARFS_TABLE_SIZE;
 320         ft_attr.level = MLX5E_ARFS_FT_LEVEL;
 321         ft_attr.prio = MLX5E_NIC_PRIO;
 322
 323         ft->t = mlx5_create_flow_table(priv->fs.ns, &ft_attr);
 324         if (IS_ERR(ft->t)) {
 325                 err = PTR_ERR(ft->t);
 326                 ft->t = NULL;
 327                 return err;
 328         }
 329
 330         err = arfs_create_groups(ft, type);
 331         if (err)
 332                 goto err;
 333
 334         err = arfs_add_default_rule(priv, type);
 335         if (err)
 336                 goto err;
 337
 338         return 0;
 339 err:
 340         mlx5e_destroy_flow_table(ft);
 341         return err;
 342 }
 343
 344 int mlx5e_arfs_create_tables(struct mlx5e_priv *priv)
 345 {
 346         int err = 0;
 347         int i;
 348
 349         if (!(priv->netdev->hw_features & NETIF_F_NTUPLE))
 350                 return 0;
 351
 352         spin_lock_init(&priv->fs.arfs.arfs_lock);
 353         INIT_LIST_HEAD(&priv->fs.arfs.rules);
 354         priv->fs.arfs.wq = create_singlethread_workqueue("mlx5e_arfs");
 355         if (!priv->fs.arfs.wq)
 356                 return -ENOMEM;
 357
 358         for (i = 0; i < ARFS_NUM_TYPES; i++) {
 359                 err = arfs_create_table(priv, i);
 360                 if (err)
 361                         goto err;
 362         }
 363         return 0;
 364 err:
 365         mlx5e_arfs_destroy_tables(priv);
 366         return err;
 367 }
 368
 369 #define MLX5E_ARFS_EXPIRY_QUOTA 60
 370
 371 static void arfs_may_expire_flow(struct mlx5e_priv *priv)
 372 {
 373         struct arfs_rule *arfs_rule;
 374         struct hlist_node *htmp;
 375         int quota = 0;
 376         int i;
 377         int j;
 378
 379         HLIST_HEAD(del_list);
 380         spin_lock_bh(&priv->fs.arfs.arfs_lock);
 381         mlx5e_for_each_arfs_rule(arfs_rule, htmp, priv->fs.arfs.arfs_tables, i, j) {
 382                 if (!work_pending(&arfs_rule->arfs_work) &&
 383                     rps_may_expire_flow(priv->netdev,
 384                                         arfs_rule->rxq, arfs_rule->flow_id,
 385                                         arfs_rule->filter_id)) {
 386                         hlist_del_init(&arfs_rule->hlist);
 387                         hlist_add_head(&arfs_rule->hlist, &del_list);
 388                         if (quota++ > MLX5E_ARFS_EXPIRY_QUOTA)
 389                                 break;
 390                 }
 391         }
 392         spin_unlock_bh(&priv->fs.arfs.arfs_lock);
 393         hlist_for_each_entry_safe(arfs_rule, htmp, &del_list, hlist) {
 394                 if (arfs_rule->rule)
 395                         mlx5_del_flow_rules(arfs_rule->rule);
 396                 hlist_del(&arfs_rule->hlist);
 397                 kfree(arfs_rule);
 398         }
 399 }
 400
 401 static void arfs_del_rules(struct mlx5e_priv *priv)
 402 {
 403         struct hlist_node *htmp;
 404         struct arfs_rule *rule;
 405         int i;
 406         int j;
 407
 408         HLIST_HEAD(del_list);
 409         spin_lock_bh(&priv->fs.arfs.arfs_lock);
 410         mlx5e_for_each_arfs_rule(rule, htmp, priv->fs.arfs.arfs_tables, i, j) {
 411                 hlist_del_init(&rule->hlist);
 412                 hlist_add_head(&rule->hlist, &del_list);
 413         }
 414         spin_unlock_bh(&priv->fs.arfs.arfs_lock);
 415
 416         hlist_for_each_entry_safe(rule, htmp, &del_list, hlist) {
 417                 cancel_work_sync(&rule->arfs_work);
 418                 if (rule->rule)
 419                         mlx5_del_flow_rules(rule->rule);
 420                 hlist_del(&rule->hlist);
 421                 kfree(rule);
 422         }
 423 }
 424
 425 static struct hlist_head *
 426 arfs_hash_bucket(struct arfs_table *arfs_t, __be16 src_port,
 427                  __be16 dst_port)
 428 {
 429         unsigned long l;
 430         int bucket_idx;
 431
 432         l = (__force unsigned long)src_port |
 433             ((__force unsigned long)dst_port << 2);
 434
 435         bucket_idx = hash_long(l, ARFS_HASH_SHIFT);
 436
 437         return &arfs_t->rules_hash[bucket_idx];
 438 }
 439
 440 static struct arfs_table *arfs_get_table(struct mlx5e_arfs_tables *arfs,
 441                                          u8 ip_proto, __be16 etype)
 442 {
 443         if (etype == htons(ETH_P_IP) && ip_proto == IPPROTO_TCP)
 444                 return &arfs->arfs_tables[ARFS_IPV4_TCP];
 445         if (etype == htons(ETH_P_IP) && ip_proto == IPPROTO_UDP)
 446                 return &arfs->arfs_tables[ARFS_IPV4_UDP];
 447         if (etype == htons(ETH_P_IPV6) && ip_proto == IPPROTO_TCP)
 448                 return &arfs->arfs_tables[ARFS_IPV6_TCP];
 449         if (etype == htons(ETH_P_IPV6) && ip_proto == IPPROTO_UDP)
 450                 return &arfs->arfs_tables[ARFS_IPV6_UDP];
 451
 452         return NULL;
 453 }
 454
 455 static struct mlx5_flow_handle *arfs_add_rule(struct mlx5e_priv *priv,
 456                                               struct arfs_rule *arfs_rule)
 457 {
 458         struct mlx5e_arfs_tables *arfs = &priv->fs.arfs;
 459         struct arfs_tuple *tuple = &arfs_rule->tuple;
 460         struct mlx5_flow_handle *rule = NULL;
 461         struct mlx5_flow_destination dest = {};
 462         MLX5_DECLARE_FLOW_ACT(flow_act);
 463         struct arfs_table *arfs_table;
 464         struct mlx5_flow_spec *spec;
 465         struct mlx5_flow_table *ft;
 466         int err = 0;
 467
 468         spec = kvzalloc(sizeof(*spec), GFP_KERNEL);
 469         if (!spec) {
 470                 err = -ENOMEM;
 471                 goto out;
 472         }
 473         spec->match_criteria_enable = MLX5_MATCH_OUTER_HEADERS;
 474         MLX5_SET_TO_ONES(fte_match_param, spec->match_criteria,
 475                          outer_headers.ethertype);
 476         MLX5_SET(fte_match_param, spec->match_value, outer_headers.ethertype,
 477                  ntohs(tuple->etype));
 478         arfs_table = arfs_get_table(arfs, tuple->ip_proto, tuple->etype);
 479         if (!arfs_table) {
 480                 err = -EINVAL;
 481                 goto out;
 482         }
 483
 484         ft = arfs_table->ft.t;
 485         if (tuple->ip_proto == IPPROTO_TCP) {
 486                 MLX5_SET_TO_ONES(fte_match_param, spec->match_criteria,
 487                                  outer_headers.tcp_dport);
 488                 MLX5_SET_TO_ONES(fte_match_param, spec->match_criteria,
 489                                  outer_headers.tcp_sport);
 490                 MLX5_SET(fte_match_param, spec->match_value, outer_headers.tcp_dport,
 491                          ntohs(tuple->dst_port));
 492                 MLX5_SET(fte_match_param, spec->match_value, outer_headers.tcp_sport,
 493                          ntohs(tuple->src_port));
 494         } else {
 495                 MLX5_SET_TO_ONES(fte_match_param, spec->match_criteria,
 496                                  outer_headers.udp_dport);
 497                 MLX5_SET_TO_ONES(fte_match_param, spec->match_criteria,
 498                                  outer_headers.udp_sport);
 499                 MLX5_SET(fte_match_param, spec->match_value, outer_headers.udp_dport,
 500                          ntohs(tuple->dst_port));
 501                 MLX5_SET(fte_match_param, spec->match_value, outer_headers.udp_sport,
 502                          ntohs(tuple->src_port));
 503         }
 504         if (tuple->etype == htons(ETH_P_IP)) {
 505                 memcpy(MLX5_ADDR_OF(fte_match_param, spec->match_value,
 506                                     outer_headers.src_ipv4_src_ipv6.ipv4_layout.ipv4),
 507                        &tuple->src_ipv4,
 508                        4);
 509                 memcpy(MLX5_ADDR_OF(fte_match_param, spec->match_value,
 510                                     outer_headers.dst_ipv4_dst_ipv6.ipv4_layout.ipv4),
 511                        &tuple->dst_ipv4,
 512                        4);
 513                 MLX5_SET_TO_ONES(fte_match_param, spec->match_criteria,
 514                                  outer_headers.src_ipv4_src_ipv6.ipv4_layout.ipv4);
 515                 MLX5_SET_TO_ONES(fte_match_param, spec->match_criteria,
 516                                  outer_headers.dst_ipv4_dst_ipv6.ipv4_layout.ipv4);
 517         } else {
 518                 memcpy(MLX5_ADDR_OF(fte_match_param, spec->match_value,
 519                                     outer_headers.src_ipv4_src_ipv6.ipv6_layout.ipv6),
 520                        &tuple->src_ipv6,
 521                        16);
 522                 memcpy(MLX5_ADDR_OF(fte_match_param, spec->match_value,
 523                                     outer_headers.dst_ipv4_dst_ipv6.ipv6_layout.ipv6),
 524                        &tuple->dst_ipv6,
 525                        16);
 526                 memset(MLX5_ADDR_OF(fte_match_param, spec->match_criteria,
 527                                     outer_headers.src_ipv4_src_ipv6.ipv6_layout.ipv6),
 528                        0xff,
 529                        16);
 530                 memset(MLX5_ADDR_OF(fte_match_param, spec->match_criteria,
 531                                     outer_headers.dst_ipv4_dst_ipv6.ipv6_layout.ipv6),
 532                        0xff,
 533                        16);
 534         }
 535         dest.type = MLX5_FLOW_DESTINATION_TYPE_TIR;
 536         dest.tir_num = priv->direct_tir[arfs_rule->rxq].tirn;
 537         rule = mlx5_add_flow_rules(ft, spec, &flow_act, &dest, 1);
 538         if (IS_ERR(rule)) {
 539                 err = PTR_ERR(rule);
 540                 netdev_err(priv->netdev, "%s: add rule(filter id=%d, rq idx=%d) failed, err=%d\n",
 541                            __func__, arfs_rule->filter_id, arfs_rule->rxq, err);
 542         }
 543
 544 out:
 545         kvfree(spec);
 546         return err ? ERR_PTR(err) : rule;
 547 }
 548
 549 static void arfs_modify_rule_rq(struct mlx5e_priv *priv,
 550                                 struct mlx5_flow_handle *rule, u16 rxq)
 551 {
 552         struct mlx5_flow_destination dst = {};
 553         int err = 0;
 554
 555         dst.type = MLX5_FLOW_DESTINATION_TYPE_TIR;
 556         dst.tir_num = priv->direct_tir[rxq].tirn;
 557         err =  mlx5_modify_rule_destination(rule, &dst, NULL);
 558         if (err)
 559                 netdev_warn(priv->netdev,
 560                             "Failed to modify aRFS rule destination to rq=%d\n", rxq);
 561 }
 562
 563 static void arfs_handle_work(struct work_struct *work)
 564 {
 565         struct arfs_rule *arfs_rule = container_of(work,
 566                                                    struct arfs_rule,
 567                                                    arfs_work);
 568         struct mlx5e_priv *priv = arfs_rule->priv;
 569         struct mlx5_flow_handle *rule;
 570
 571         mutex_lock(&priv->state_lock);
 572         if (!test_bit(MLX5E_STATE_OPENED, &priv->state)) {
 573                 spin_lock_bh(&priv->fs.arfs.arfs_lock);
 574                 hlist_del(&arfs_rule->hlist);
 575                 spin_unlock_bh(&priv->fs.arfs.arfs_lock);
 576
 577                 mutex_unlock(&priv->state_lock);
 578                 kfree(arfs_rule);
 579                 goto out;
 580         }
 581         mutex_unlock(&priv->state_lock);
 582
 583         if (!arfs_rule->rule) {
 584                 rule = arfs_add_rule(priv, arfs_rule);
 585                 if (IS_ERR(rule))
 586                         goto out;
 587                 arfs_rule->rule = rule;
 588         } else {
 589                 arfs_modify_rule_rq(priv, arfs_rule->rule,
 590                                     arfs_rule->rxq);
 591         }
 592 out:
 593         arfs_may_expire_flow(priv);
 594 }
 595
 596 static struct arfs_rule *arfs_alloc_rule(struct mlx5e_priv *priv,
 597                                          struct arfs_table *arfs_t,
 598                                          const struct flow_keys *fk,
 599                                          u16 rxq, u32 flow_id)
 600 {
 601         struct arfs_rule *rule;
 602         struct arfs_tuple *tuple;
 603
 604         rule = kzalloc(sizeof(*rule), GFP_ATOMIC);
 605         if (!rule)
 606                 return NULL;
 607
 608         rule->priv = priv;
 609         rule->rxq = rxq;
 610         INIT_WORK(&rule->arfs_work, arfs_handle_work);
 611
 612         tuple = &rule->tuple;
 613         tuple->etype = fk->basic.n_proto;
 614         tuple->ip_proto = fk->basic.ip_proto;
 615         if (tuple->etype == htons(ETH_P_IP)) {
 616                 tuple->src_ipv4 = fk->addrs.v4addrs.src;
 617                 tuple->dst_ipv4 = fk->addrs.v4addrs.dst;
 618         } else {
 619                 memcpy(&tuple->src_ipv6, &fk->addrs.v6addrs.src,
 620                        sizeof(struct in6_addr));
 621                 memcpy(&tuple->dst_ipv6, &fk->addrs.v6addrs.dst,
 622                        sizeof(struct in6_addr));
 623         }
 624         tuple->src_port = fk->ports.src;
 625         tuple->dst_port = fk->ports.dst;
 626
 627         rule->flow_id = flow_id;
 628         rule->filter_id = priv->fs.arfs.last_filter_id++ % RPS_NO_FILTER;
 629
 630         hlist_add_head(&rule->hlist,
 631                        arfs_hash_bucket(arfs_t, tuple->src_port,
 632                                         tuple->dst_port));
 633         return rule;
 634 }
 635
 636 static bool arfs_cmp(const struct arfs_tuple *tuple, const struct flow_keys *fk)
 637 {
 638         if (tuple->src_port != fk->ports.src || tuple->dst_port != fk->ports.dst)
 639                 return false;
 640         if (tuple->etype != fk->basic.n_proto)
 641                 return false;
 642         if (tuple->etype == htons(ETH_P_IP))
 643                 return tuple->src_ipv4 == fk->addrs.v4addrs.src &&
 644                        tuple->dst_ipv4 == fk->addrs.v4addrs.dst;
 645         if (tuple->etype == htons(ETH_P_IPV6))
 646                 return !memcmp(&tuple->src_ipv6, &fk->addrs.v6addrs.src,
 647                                sizeof(struct in6_addr)) &&
 648                        !memcmp(&tuple->dst_ipv6, &fk->addrs.v6addrs.dst,
 649                                sizeof(struct in6_addr));
 650         return false;
 651 }
 652
 653 static struct arfs_rule *arfs_find_rule(struct arfs_table *arfs_t,
 654                                         const struct flow_keys *fk)
 655 {
 656         struct arfs_rule *arfs_rule;
 657         struct hlist_head *head;
 658
 659         head = arfs_hash_bucket(arfs_t, fk->ports.src, fk->ports.dst);
 660         hlist_for_each_entry(arfs_rule, head, hlist) {
 661                 if (arfs_cmp(&arfs_rule->tuple, fk))
 662                         return arfs_rule;
 663         }
 664
 665         return NULL;
 666 }
 667
 668 int mlx5e_rx_flow_steer(struct net_device *dev, const struct sk_buff *skb,
 669                         u16 rxq_index, u32 flow_id)
 670 {
 671         struct mlx5e_priv *priv = netdev_priv(dev);
 672         struct mlx5e_arfs_tables *arfs = &priv->fs.arfs;
 673         struct arfs_table *arfs_t;
 674         struct arfs_rule *arfs_rule;
 675         struct flow_keys fk;
 676
 677         if (!skb_flow_dissect_flow_keys(skb, &fk, 0))
 678                 return -EPROTONOSUPPORT;
 679
 680         if (fk.basic.n_proto != htons(ETH_P_IP) &&
 681             fk.basic.n_proto != htons(ETH_P_IPV6))
 682                 return -EPROTONOSUPPORT;
 683
 684         if (skb->encapsulation)
 685                 return -EPROTONOSUPPORT;
 686
 687         arfs_t = arfs_get_table(arfs, fk.basic.ip_proto, fk.basic.n_proto);
 688         if (!arfs_t)
 689                 return -EPROTONOSUPPORT;
 690
 691         spin_lock_bh(&arfs->arfs_lock);
 692         arfs_rule = arfs_find_rule(arfs_t, &fk);
 693         if (arfs_rule) {
 694                 if (arfs_rule->rxq == rxq_index) {
 695                         spin_unlock_bh(&arfs->arfs_lock);
 696                         return arfs_rule->filter_id;
 697                 }
 698                 arfs_rule->rxq = rxq_index;
 699         } else {
 700                 arfs_rule = arfs_alloc_rule(priv, arfs_t, &fk, rxq_index, flow_id);
 701                 if (!arfs_rule) {
 702                         spin_unlock_bh(&arfs->arfs_lock);
 703                         return -ENOMEM;
 704                 }
 705         }
 706         queue_work(priv->fs.arfs.wq, &arfs_rule->arfs_work);
 707         spin_unlock_bh(&arfs->arfs_lock);
 708         return arfs_rule->filter_id;
 709 }
 710