drivers/net/sfc/sfc_switch.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  *
   3  * Copyright(c) 2019-2021 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 #include <rte_spinlock.h>
  14
  15 #include "efx.h"
  16
  17 #include "sfc.h"
  18 #include "sfc_log.h"
  19 #include "sfc_switch.h"
  20
  21 /**
  22  * Switch port registry entry.
  23  *
  24  * Drivers aware of RTE switch domains also have to maintain RTE switch
  25  * port IDs for RTE ethdev instances they operate. These IDs are supposed
  26  * to stand for physical interconnect entities, in example, PCIe functions.
  27  *
  28  * In terms of MAE, a physical interconnect entity can be referred to using
  29  * an MPORT selector, that is, a 32-bit value. RTE switch port IDs, in turn,
  30  * are 16-bit values, so indirect mapping has to be maintained:
  31  *
  32  * +--------------------+          +---------------------------------------+
  33  * | RTE switch port ID |  ------  |         MAE switch port entry         |
  34  * +--------------------+          |         ---------------------         |
  35  *                                 |                                       |
  36  *                                 | Entity (PCIe function) MPORT selector |
  37  *                                 |                   +                   |
  38  *                                 |  Port type (independent/representor)  |
  39  *                                 +---------------------------------------+
  40  *
  41  * This mapping comprises a port type to ensure that RTE switch port ID
  42  * of a represented entity and that of its representor are different in
  43  * the case when the entity gets plugged into DPDK and not into a guest.
  44  *
  45  * Entry data also comprises RTE ethdev's own MPORT. This value
  46  * coincides with the entity MPORT in the case of independent ports.
  47  * In the case of representors, this ID is not a selector and refers
  48  * to an allocatable object (that is, it's likely to change on RTE
  49  * ethdev replug). Flow API backend must use this value rather
  50  * than entity_mport to support flow rule action PORT_ID.
  51  */
  52 struct sfc_mae_switch_port {
  53         TAILQ_ENTRY(sfc_mae_switch_port)        switch_domain_ports;
  54
  55         /** RTE ethdev MPORT */
  56         efx_mport_sel_t                         ethdev_mport;
  57         /** RTE ethdev port ID */
  58         uint16_t                                ethdev_port_id;
  59
  60         /** Entity (PCIe function) MPORT selector */
  61         efx_mport_sel_t                         entity_mport;
  62         /** Port type (independent/representor) */
  63         enum sfc_mae_switch_port_type           type;
  64         /** RTE switch port ID */
  65         uint16_t                                id;
  66
  67         union sfc_mae_switch_port_data          data;
  68 };
  69
  70 TAILQ_HEAD(sfc_mae_switch_ports, sfc_mae_switch_port);
  71
  72 /**
  73  * Switch domain registry entry.
  74  *
  75  * Even if an RTE ethdev instance gets unplugged, the corresponding
  76  * entry in the switch port registry will not be removed because the
  77  * entity (PCIe function) MPORT is static and cannot change. If this
  78  * RTE ethdev gets plugged back, the entry will be reused, and
  79  * RTE switch port ID will be the same.
  80  */
  81 struct sfc_mae_switch_domain {
  82         TAILQ_ENTRY(sfc_mae_switch_domain)      entries;
  83
  84         /** HW switch ID */
  85         struct sfc_hw_switch_id                 *hw_switch_id;
  86         /** The number of ports in the switch port registry */
  87         unsigned int                            nb_ports;
  88         /** Switch port registry */
  89         struct sfc_mae_switch_ports             ports;
  90         /** RTE switch domain ID allocated for a group of devices */
  91         uint16_t                                id;
  92         /** DPDK controller -> EFX interface mapping */
  93         efx_pcie_interface_t                    *controllers;
  94         /** Number of DPDK controllers and EFX interfaces */
  95         size_t                                  nb_controllers;
  96 };
  97
  98 TAILQ_HEAD(sfc_mae_switch_domains, sfc_mae_switch_domain);
  99
 100 /**
 101  * MAE representation of RTE switch infrastructure.
 102  *
 103  * It is possible that an RTE flow API client tries to insert a rule
 104  * referencing an RTE ethdev deployed on top of a different physical
 105  * device (it may belong to the same vendor or not). This particular
 106  * driver/engine cannot support this and has to turn down such rules.
 107  *
 108  * Technically, it's HW switch identifier which, if queried for each
 109  * RTE ethdev instance, indicates relationship between the instances.
 110  * In the meantime, RTE flow API clients also need to somehow figure
 111  * out relationship between RTE ethdev instances in advance.
 112  *
 113  * The concept of RTE switch domains resolves this issue. The driver
 114  * maintains a static list of switch domains which is easy to browse,
 115  * and each RTE ethdev fills RTE switch parameters in device
 116  * information structure which is made available to clients.
 117  *
 118  * Even if all RTE ethdev instances belonging to a switch domain get
 119  * unplugged, the corresponding entry in the switch domain registry
 120  * will not be removed because the corresponding HW switch exists
 121  * regardless of its ports being plugged to DPDK or kept aside.
 122  * If a port gets plugged back to DPDK, the corresponding
 123  * RTE ethdev will indicate the same RTE switch domain ID.
 124  */
 125 struct sfc_mae_switch {
 126         /** A lock to protect the whole structure */
 127         rte_spinlock_t                  lock;
 128         /** Switch domain registry */
 129         struct sfc_mae_switch_domains   domains;
 130 };
 131
 132 static struct sfc_mae_switch sfc_mae_switch = {
 133         .lock = RTE_SPINLOCK_INITIALIZER,
 134         .domains = TAILQ_HEAD_INITIALIZER(sfc_mae_switch.domains),
 135 };
 136
 137
 138 /* This function expects to be called only when the lock is held */
 139 static struct sfc_mae_switch_domain *
 140 sfc_mae_find_switch_domain_by_id(uint16_t switch_domain_id)
 141 {
 142         struct sfc_mae_switch_domain *domain;
 143
 144         SFC_ASSERT(rte_spinlock_is_locked(&sfc_mae_switch.lock));
 145
 146         TAILQ_FOREACH(domain, &sfc_mae_switch.domains, entries) {
 147                 if (domain->id == switch_domain_id)
 148                         return domain;
 149         }
 150
 151         return NULL;
 152 }
 153
 154 /* This function expects to be called only when the lock is held */
 155 static struct sfc_mae_switch_domain *
 156 sfc_mae_find_switch_domain_by_hw_switch_id(const struct sfc_hw_switch_id *id)
 157 {
 158         struct sfc_mae_switch_domain *domain;
 159
 160         SFC_ASSERT(rte_spinlock_is_locked(&sfc_mae_switch.lock));
 161
 162         TAILQ_FOREACH(domain, &sfc_mae_switch.domains, entries) {
 163                 if (sfc_hw_switch_ids_equal(domain->hw_switch_id, id))
 164                         return domain;
 165         }
 166
 167         return NULL;
 168 }
 169
 170 int
 171 sfc_mae_assign_switch_domain(struct sfc_adapter *sa,
 172                              uint16_t *switch_domain_id)
 173 {
 174         struct sfc_hw_switch_id *hw_switch_id;
 175         struct sfc_mae_switch_domain *domain;
 176         int rc;
 177
 178         rte_spinlock_lock(&sfc_mae_switch.lock);
 179
 180         rc = sfc_hw_switch_id_init(sa, &hw_switch_id);
 181         if (rc != 0)
 182                 goto fail_hw_switch_id_init;
 183
 184         domain = sfc_mae_find_switch_domain_by_hw_switch_id(hw_switch_id);
 185         if (domain != NULL) {
 186                 sfc_hw_switch_id_fini(sa, hw_switch_id);
 187                 goto done;
 188         }
 189
 190         domain = rte_zmalloc("sfc_mae_switch_domain", sizeof(*domain), 0);
 191         if (domain == NULL) {
 192                 rc = ENOMEM;
 193                 goto fail_mem_alloc;
 194         }
 195
 196         /*
 197          * This code belongs to driver init path, that is, negation is
 198          * done at the end of the path by sfc_eth_dev_init(). RTE APIs
 199          * negate error codes, so drop negation here.
 200          */
 201         rc = -rte_eth_switch_domain_alloc(&domain->id);
 202         if (rc != 0)
 203                 goto fail_domain_alloc;
 204
 205         domain->hw_switch_id = hw_switch_id;
 206
 207         TAILQ_INIT(&domain->ports);
 208
 209         TAILQ_INSERT_TAIL(&sfc_mae_switch.domains, domain, entries);
 210
 211 done:
 212         *switch_domain_id = domain->id;
 213
 214         rte_spinlock_unlock(&sfc_mae_switch.lock);
 215
 216         return 0;
 217
 218 fail_domain_alloc:
 219         rte_free(domain);
 220
 221 fail_mem_alloc:
 222         sfc_hw_switch_id_fini(sa, hw_switch_id);
 223
 224 fail_hw_switch_id_init:
 225         rte_spinlock_unlock(&sfc_mae_switch.lock);
 226         return rc;
 227 }
 228
 229 int
 230 sfc_mae_switch_domain_controllers(uint16_t switch_domain_id,
 231                                   const efx_pcie_interface_t **controllers,
 232                                   size_t *nb_controllers)
 233 {
 234         struct sfc_mae_switch_domain *domain;
 235
 236         if (controllers == NULL || nb_controllers == NULL)
 237                 return EINVAL;
 238
 239         rte_spinlock_lock(&sfc_mae_switch.lock);
 240
 241         domain = sfc_mae_find_switch_domain_by_id(switch_domain_id);
 242         if (domain == NULL) {
 243                 rte_spinlock_unlock(&sfc_mae_switch.lock);
 244                 return EINVAL;
 245         }
 246
 247         *controllers = domain->controllers;
 248         *nb_controllers = domain->nb_controllers;
 249
 250         rte_spinlock_unlock(&sfc_mae_switch.lock);
 251         return 0;
 252 }
 253
 254 int
 255 sfc_mae_switch_domain_map_controllers(uint16_t switch_domain_id,
 256                                       efx_pcie_interface_t *controllers,
 257                                       size_t nb_controllers)
 258 {
 259         struct sfc_mae_switch_domain *domain;
 260
 261         rte_spinlock_lock(&sfc_mae_switch.lock);
 262
 263         domain = sfc_mae_find_switch_domain_by_id(switch_domain_id);
 264         if (domain == NULL) {
 265                 rte_spinlock_unlock(&sfc_mae_switch.lock);
 266                 return EINVAL;
 267         }
 268
 269         /* Controller mapping may be set only once */
 270         if (domain->controllers != NULL) {
 271                 rte_spinlock_unlock(&sfc_mae_switch.lock);
 272                 return EINVAL;
 273         }
 274
 275         domain->controllers = controllers;
 276         domain->nb_controllers = nb_controllers;
 277
 278         rte_spinlock_unlock(&sfc_mae_switch.lock);
 279         return 0;
 280 }
 281
 282 int
 283 sfc_mae_switch_domain_get_controller(uint16_t switch_domain_id,
 284                                      efx_pcie_interface_t intf,
 285                                      int *controller)
 286 {
 287         const efx_pcie_interface_t *controllers;
 288         size_t nb_controllers;
 289         size_t i;
 290         int rc;
 291
 292         rc = sfc_mae_switch_domain_controllers(switch_domain_id, &controllers,
 293                                                &nb_controllers);
 294         if (rc != 0)
 295                 return rc;
 296
 297         if (controllers == NULL)
 298                 return ENOENT;
 299
 300         for (i = 0; i < nb_controllers; i++) {
 301                 if (controllers[i] == intf) {
 302                         *controller = i;
 303                         return 0;
 304                 }
 305         }
 306
 307         return ENOENT;
 308 }
 309
 310 /* This function expects to be called only when the lock is held */
 311 static struct sfc_mae_switch_port *
 312 sfc_mae_find_switch_port_by_entity(const struct sfc_mae_switch_domain *domain,
 313                                    const efx_mport_sel_t *entity_mportp,
 314                                    enum sfc_mae_switch_port_type type)
 315 {
 316         struct sfc_mae_switch_port *port;
 317
 318         SFC_ASSERT(rte_spinlock_is_locked(&sfc_mae_switch.lock));
 319
 320         TAILQ_FOREACH(port, &domain->ports, switch_domain_ports) {
 321                 if (port->entity_mport.sel == entity_mportp->sel &&
 322                     port->type == type)
 323                         return port;
 324         }
 325
 326         return NULL;
 327 }
 328
 329 int
 330 sfc_mae_assign_switch_port(uint16_t switch_domain_id,
 331                            const struct sfc_mae_switch_port_request *req,
 332                            uint16_t *switch_port_id)
 333 {
 334         struct sfc_mae_switch_domain *domain;
 335         struct sfc_mae_switch_port *port;
 336         int rc;
 337
 338         rte_spinlock_lock(&sfc_mae_switch.lock);
 339
 340         domain = sfc_mae_find_switch_domain_by_id(switch_domain_id);
 341         if (domain == NULL) {
 342                 rc = EINVAL;
 343                 goto fail_find_switch_domain_by_id;
 344         }
 345
 346         port = sfc_mae_find_switch_port_by_entity(domain, req->entity_mportp,
 347                                                   req->type);
 348         if (port != NULL)
 349                 goto done;
 350
 351         port = rte_zmalloc("sfc_mae_switch_port", sizeof(*port), 0);
 352         if (port == NULL) {
 353                 rc = ENOMEM;
 354                 goto fail_mem_alloc;
 355         }
 356
 357         port->entity_mport.sel = req->entity_mportp->sel;
 358         port->type = req->type;
 359
 360         port->id = (domain->nb_ports++);
 361
 362         TAILQ_INSERT_TAIL(&domain->ports, port, switch_domain_ports);
 363
 364 done:
 365         port->ethdev_mport = *req->ethdev_mportp;
 366         port->ethdev_port_id = req->ethdev_port_id;
 367
 368         switch (req->type) {
 369         case SFC_MAE_SWITCH_PORT_INDEPENDENT:
 370                 /* No data */
 371                 break;
 372         case SFC_MAE_SWITCH_PORT_REPRESENTOR:
 373                 memcpy(&port->data.repr, &req->port_data,
 374                        sizeof(port->data.repr));
 375                 break;
 376         default:
 377                 SFC_ASSERT(B_FALSE);
 378         }
 379
 380         *switch_port_id = port->id;
 381
 382         rte_spinlock_unlock(&sfc_mae_switch.lock);
 383
 384         return 0;
 385
 386 fail_mem_alloc:
 387 fail_find_switch_domain_by_id:
 388         rte_spinlock_unlock(&sfc_mae_switch.lock);
 389         return rc;
 390 }
 391
 392 /* This function expects to be called only when the lock is held */
 393 static int
 394 sfc_mae_find_switch_port_by_ethdev(uint16_t switch_domain_id,
 395                                    uint16_t ethdev_port_id,
 396                                    efx_mport_sel_t *mport_sel)
 397 {
 398         struct sfc_mae_switch_domain *domain;
 399         struct sfc_mae_switch_port *port;
 400
 401         SFC_ASSERT(rte_spinlock_is_locked(&sfc_mae_switch.lock));
 402
 403         if (ethdev_port_id == RTE_MAX_ETHPORTS)
 404                 return EINVAL;
 405
 406         domain = sfc_mae_find_switch_domain_by_id(switch_domain_id);
 407         if (domain == NULL)
 408                 return EINVAL;
 409
 410         TAILQ_FOREACH(port, &domain->ports, switch_domain_ports) {
 411                 if (port->ethdev_port_id == ethdev_port_id) {
 412                         *mport_sel = port->ethdev_mport;
 413                         return 0;
 414                 }
 415         }
 416
 417         return ENOENT;
 418 }
 419
 420 int
 421 sfc_mae_switch_port_by_ethdev(uint16_t switch_domain_id,
 422                               uint16_t ethdev_port_id,
 423                               efx_mport_sel_t *mport_sel)
 424 {
 425         int rc;
 426
 427         rte_spinlock_lock(&sfc_mae_switch.lock);
 428         rc = sfc_mae_find_switch_port_by_ethdev(switch_domain_id,
 429                                                 ethdev_port_id, mport_sel);
 430         rte_spinlock_unlock(&sfc_mae_switch.lock);
 431
 432         return rc;
 433 }