drivers/net/sfc/sfc_mae.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  *
   3  * Copyright(c) 2019-2020 Xilinx, Inc.
   4  * Copyright(c) 2019 Solarflare Communications Inc.
   5  *
   6  * This software was jointly developed between OKTET Labs (under contract
   7  * for Solarflare) and Solarflare Communications, Inc.
   8  */
   9
  10 #include <stdbool.h>
  11
  12 #include <rte_common.h>
  13
  14 #include "efx.h"
  15
  16 #include "sfc.h"
  17 #include "sfc_log.h"
  18
  19 int
  20 sfc_mae_attach(struct sfc_adapter *sa)
  21 {
  22         const efx_nic_cfg_t *encp = efx_nic_cfg_get(sa->nic);
  23         struct sfc_mae *mae = &sa->mae;
  24         efx_mae_limits_t limits;
  25         int rc;
  26
  27         sfc_log_init(sa, "entry");
  28
  29         if (!encp->enc_mae_supported) {
  30                 mae->status = SFC_MAE_STATUS_UNSUPPORTED;
  31                 return 0;
  32         }
  33
  34         sfc_log_init(sa, "init MAE");
  35         rc = efx_mae_init(sa->nic);
  36         if (rc != 0)
  37                 goto fail_mae_init;
  38
  39         sfc_log_init(sa, "get MAE limits");
  40         rc = efx_mae_get_limits(sa->nic, &limits);
  41         if (rc != 0)
  42                 goto fail_mae_get_limits;
  43
  44         mae->status = SFC_MAE_STATUS_SUPPORTED;
  45         mae->nb_action_rule_prios_max = limits.eml_max_n_action_prios;
  46         TAILQ_INIT(&mae->action_sets);
  47
  48         sfc_log_init(sa, "done");
  49
  50         return 0;
  51
  52 fail_mae_get_limits:
  53         efx_mae_fini(sa->nic);
  54
  55 fail_mae_init:
  56         sfc_log_init(sa, "failed %d", rc);
  57
  58         return rc;
  59 }
  60
  61 void
  62 sfc_mae_detach(struct sfc_adapter *sa)
  63 {
  64         struct sfc_mae *mae = &sa->mae;
  65         enum sfc_mae_status status_prev = mae->status;
  66
  67         sfc_log_init(sa, "entry");
  68
  69         mae->nb_action_rule_prios_max = 0;
  70         mae->status = SFC_MAE_STATUS_UNKNOWN;
  71
  72         if (status_prev != SFC_MAE_STATUS_SUPPORTED)
  73                 return;
  74
  75         efx_mae_fini(sa->nic);
  76
  77         sfc_log_init(sa, "done");
  78 }
  79
  80 static struct sfc_mae_action_set *
  81 sfc_mae_action_set_attach(struct sfc_adapter *sa,
  82                           const efx_mae_actions_t *spec)
  83 {
  84         struct sfc_mae_action_set *action_set;
  85         struct sfc_mae *mae = &sa->mae;
  86
  87         SFC_ASSERT(sfc_adapter_is_locked(sa));
  88
  89         TAILQ_FOREACH(action_set, &mae->action_sets, entries) {
  90                 if (efx_mae_action_set_specs_equal(action_set->spec, spec)) {
  91                         ++(action_set->refcnt);
  92                         return action_set;
  93                 }
  94         }
  95
  96         return NULL;
  97 }
  98
  99 static int
 100 sfc_mae_action_set_add(struct sfc_adapter *sa,
 101                        efx_mae_actions_t *spec,
 102                        struct sfc_mae_action_set **action_setp)
 103 {
 104         struct sfc_mae_action_set *action_set;
 105         struct sfc_mae *mae = &sa->mae;
 106
 107         SFC_ASSERT(sfc_adapter_is_locked(sa));
 108
 109         action_set = rte_zmalloc("sfc_mae_action_set", sizeof(*action_set), 0);
 110         if (action_set == NULL)
 111                 return ENOMEM;
 112
 113         action_set->refcnt = 1;
 114         action_set->spec = spec;
 115
 116         TAILQ_INSERT_TAIL(&mae->action_sets, action_set, entries);
 117
 118         *action_setp = action_set;
 119
 120         return 0;
 121 }
 122
 123 static void
 124 sfc_mae_action_set_del(struct sfc_adapter *sa,
 125                        struct sfc_mae_action_set *action_set)
 126 {
 127         struct sfc_mae *mae = &sa->mae;
 128
 129         SFC_ASSERT(sfc_adapter_is_locked(sa));
 130         SFC_ASSERT(action_set->refcnt != 0);
 131
 132         --(action_set->refcnt);
 133
 134         if (action_set->refcnt != 0)
 135                 return;
 136
 137         efx_mae_action_set_spec_fini(sa->nic, action_set->spec);
 138         TAILQ_REMOVE(&mae->action_sets, action_set, entries);
 139         rte_free(action_set);
 140 }
 141
 142 void
 143 sfc_mae_flow_cleanup(struct sfc_adapter *sa,
 144                      struct rte_flow *flow)
 145 {
 146         struct sfc_flow_spec *spec;
 147         struct sfc_flow_spec_mae *spec_mae;
 148
 149         if (flow == NULL)
 150                 return;
 151
 152         spec = &flow->spec;
 153
 154         if (spec == NULL)
 155                 return;
 156
 157         spec_mae = &spec->mae;
 158
 159         if (spec_mae->action_set != NULL)
 160                 sfc_mae_action_set_del(sa, spec_mae->action_set);
 161
 162         if (spec_mae->match_spec != NULL)
 163                 efx_mae_match_spec_fini(sa->nic, spec_mae->match_spec);
 164 }
 165
 166 static int
 167 sfc_mae_rule_parse_item_phy_port(const struct rte_flow_item *item,
 168                                  struct sfc_flow_parse_ctx *ctx,
 169                                  struct rte_flow_error *error)
 170 {
 171         struct sfc_mae_parse_ctx *ctx_mae = ctx->mae;
 172         const struct rte_flow_item_phy_port supp_mask = {
 173                 .index = 0xffffffff,
 174         };
 175         const void *def_mask = &rte_flow_item_phy_port_mask;
 176         const struct rte_flow_item_phy_port *spec = NULL;
 177         const struct rte_flow_item_phy_port *mask = NULL;
 178         efx_mport_sel_t mport_v;
 179         int rc;
 180
 181         if (ctx_mae->match_mport_set) {
 182                 return rte_flow_error_set(error, ENOTSUP,
 183                                 RTE_FLOW_ERROR_TYPE_ITEM, item,
 184                                 "Can't handle multiple traffic source items");
 185         }
 186
 187         rc = sfc_flow_parse_init(item,
 188                                  (const void **)&spec, (const void **)&mask,
 189                                  (const void *)&supp_mask, def_mask,
 190                                  sizeof(struct rte_flow_item_phy_port), error);
 191         if (rc != 0)
 192                 return rc;
 193
 194         if (mask->index != supp_mask.index) {
 195                 return rte_flow_error_set(error, EINVAL,
 196                                 RTE_FLOW_ERROR_TYPE_ITEM, item,
 197                                 "Bad mask in the PHY_PORT pattern item");
 198         }
 199
 200         /* If "spec" is not set, could be any physical port */
 201         if (spec == NULL)
 202                 return 0;
 203
 204         rc = efx_mae_mport_by_phy_port(spec->index, &mport_v);
 205         if (rc != 0) {
 206                 return rte_flow_error_set(error, rc,
 207                                 RTE_FLOW_ERROR_TYPE_ITEM, item,
 208                                 "Failed to convert the PHY_PORT index");
 209         }
 210
 211         rc = efx_mae_match_spec_mport_set(ctx_mae->match_spec_action,
 212                                           &mport_v, NULL);
 213         if (rc != 0) {
 214                 return rte_flow_error_set(error, rc,
 215                                 RTE_FLOW_ERROR_TYPE_ITEM, item,
 216                                 "Failed to set MPORT for the PHY_PORT");
 217         }
 218
 219         ctx_mae->match_mport_set = B_TRUE;
 220
 221         return 0;
 222 }
 223
 224 static const struct sfc_flow_item sfc_flow_items[] = {
 225         {
 226                 .type = RTE_FLOW_ITEM_TYPE_PHY_PORT,
 227                 /*
 228                  * In terms of RTE flow, this item is a META one,
 229                  * and its position in the pattern is don't care.
 230                  */
 231                 .prev_layer = SFC_FLOW_ITEM_ANY_LAYER,
 232                 .layer = SFC_FLOW_ITEM_ANY_LAYER,
 233                 .ctx_type = SFC_FLOW_PARSE_CTX_MAE,
 234                 .parse = sfc_mae_rule_parse_item_phy_port,
 235         },
 236 };
 237
 238 int
 239 sfc_mae_rule_parse_pattern(struct sfc_adapter *sa,
 240                            const struct rte_flow_item pattern[],
 241                            struct sfc_flow_spec_mae *spec,
 242                            struct rte_flow_error *error)
 243 {
 244         struct sfc_mae_parse_ctx ctx_mae;
 245         struct sfc_flow_parse_ctx ctx;
 246         int rc;
 247
 248         memset(&ctx_mae, 0, sizeof(ctx_mae));
 249
 250         rc = efx_mae_match_spec_init(sa->nic, EFX_MAE_RULE_ACTION,
 251                                      spec->priority,
 252                                      &ctx_mae.match_spec_action);
 253         if (rc != 0) {
 254                 rc = rte_flow_error_set(error, rc,
 255                         RTE_FLOW_ERROR_TYPE_UNSPECIFIED, NULL,
 256                         "Failed to initialise action rule match specification");
 257                 goto fail_init_match_spec_action;
 258         }
 259
 260         ctx.type = SFC_FLOW_PARSE_CTX_MAE;
 261         ctx.mae = &ctx_mae;
 262
 263         rc = sfc_flow_parse_pattern(sfc_flow_items, RTE_DIM(sfc_flow_items),
 264                                     pattern, &ctx, error);
 265         if (rc != 0)
 266                 goto fail_parse_pattern;
 267
 268         if (!efx_mae_match_spec_is_valid(sa->nic, ctx_mae.match_spec_action)) {
 269                 rc = rte_flow_error_set(error, ENOTSUP,
 270                                         RTE_FLOW_ERROR_TYPE_ITEM, NULL,
 271                                         "Inconsistent pattern");
 272                 goto fail_validate_match_spec_action;
 273         }
 274
 275         spec->match_spec = ctx_mae.match_spec_action;
 276
 277         return 0;
 278
 279 fail_validate_match_spec_action:
 280 fail_parse_pattern:
 281         efx_mae_match_spec_fini(sa->nic, ctx_mae.match_spec_action);
 282
 283 fail_init_match_spec_action:
 284         return rc;
 285 }
 286
 287 static int
 288 sfc_mae_rule_parse_action(const struct rte_flow_action *action,
 289                           __rte_unused efx_mae_actions_t *spec,
 290                           struct rte_flow_error *error)
 291 {
 292         switch (action->type) {
 293         default:
 294                 return rte_flow_error_set(error, ENOTSUP,
 295                                 RTE_FLOW_ERROR_TYPE_ACTION, NULL,
 296                                 "Unsupported action");
 297         }
 298
 299         return 0;
 300 }
 301
 302 int
 303 sfc_mae_rule_parse_actions(struct sfc_adapter *sa,
 304                            const struct rte_flow_action actions[],
 305                            struct sfc_mae_action_set **action_setp,
 306                            struct rte_flow_error *error)
 307 {
 308         const struct rte_flow_action *action;
 309         efx_mae_actions_t *spec;
 310         int rc;
 311
 312         if (actions == NULL) {
 313                 return rte_flow_error_set(error, EINVAL,
 314                                 RTE_FLOW_ERROR_TYPE_ACTION_NUM, NULL,
 315                                 "NULL actions");
 316         }
 317
 318         rc = efx_mae_action_set_spec_init(sa->nic, &spec);
 319         if (rc != 0)
 320                 goto fail_action_set_spec_init;
 321
 322         for (action = actions;
 323              action->type != RTE_FLOW_ACTION_TYPE_END; ++action) {
 324                 rc = sfc_mae_rule_parse_action(action, spec, error);
 325                 if (rc != 0)
 326                         goto fail_rule_parse_action;
 327         }
 328
 329         *action_setp = sfc_mae_action_set_attach(sa, spec);
 330         if (*action_setp != NULL) {
 331                 efx_mae_action_set_spec_fini(sa->nic, spec);
 332                 return 0;
 333         }
 334
 335         rc = sfc_mae_action_set_add(sa, spec, action_setp);
 336         if (rc != 0)
 337                 goto fail_action_set_add;
 338
 339         return 0;
 340
 341 fail_action_set_add:
 342 fail_rule_parse_action:
 343         efx_mae_action_set_spec_fini(sa->nic, spec);
 344
 345 fail_action_set_spec_init:
 346         if (rc > 0) {
 347                 rc = rte_flow_error_set(error, rc,
 348                         RTE_FLOW_ERROR_TYPE_UNSPECIFIED,
 349                         NULL, "Failed to process the action");
 350         }
 351         return rc;
 352 }
 353
 354 static bool
 355 sfc_mae_rules_class_cmp(struct sfc_adapter *sa,
 356                         const efx_mae_match_spec_t *left,
 357                         const efx_mae_match_spec_t *right)
 358 {
 359         bool have_same_class;
 360         int rc;
 361
 362         rc = efx_mae_match_specs_class_cmp(sa->nic, left, right,
 363                                            &have_same_class);
 364
 365         return (rc == 0) ? have_same_class : false;
 366 }
 367
 368 static int
 369 sfc_mae_action_rule_class_verify(struct sfc_adapter *sa,
 370                                  struct sfc_flow_spec_mae *spec)
 371 {
 372         const struct rte_flow *entry;
 373
 374         TAILQ_FOREACH_REVERSE(entry, &sa->flow_list, sfc_flow_list, entries) {
 375                 const struct sfc_flow_spec *entry_spec = &entry->spec;
 376                 const struct sfc_flow_spec_mae *es_mae = &entry_spec->mae;
 377                 const efx_mae_match_spec_t *left = es_mae->match_spec;
 378                 const efx_mae_match_spec_t *right = spec->match_spec;
 379
 380                 switch (entry_spec->type) {
 381                 case SFC_FLOW_SPEC_FILTER:
 382                         /* Ignore VNIC-level flows */
 383                         break;
 384                 case SFC_FLOW_SPEC_MAE:
 385                         if (sfc_mae_rules_class_cmp(sa, left, right))
 386                                 return 0;
 387                         break;
 388                 default:
 389                         SFC_ASSERT(false);
 390                 }
 391         }
 392
 393         sfc_info(sa, "for now, the HW doesn't support rule validation, and HW "
 394                  "support for inner frame pattern items is not guaranteed; "
 395                  "other than that, the items are valid from SW standpoint");
 396         return 0;
 397 }
 398
 399 /**
 400  * Confirm that a given flow can be accepted by the FW.
 401  *
 402  * @param sa
 403  *   Software adapter context
 404  * @param flow
 405  *   Flow to be verified
 406  * @return
 407  *   Zero on success and non-zero in the case of error.
 408  *   A special value of EAGAIN indicates that the adapter is
 409  *   not in started state. This state is compulsory because
 410  *   it only makes sense to compare the rule class of the flow
 411  *   being validated with classes of the active rules.
 412  *   Such classes are wittingly supported by the FW.
 413  */
 414 int
 415 sfc_mae_flow_verify(struct sfc_adapter *sa,
 416                     struct rte_flow *flow)
 417 {
 418         struct sfc_flow_spec *spec = &flow->spec;
 419         struct sfc_flow_spec_mae *spec_mae = &spec->mae;
 420
 421         SFC_ASSERT(sfc_adapter_is_locked(sa));
 422
 423         if (sa->state != SFC_ADAPTER_STARTED)
 424                 return EAGAIN;
 425
 426         return sfc_mae_action_rule_class_verify(sa, spec_mae);
 427 }