drivers/net/failsafe/failsafe.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright 2017 6WIND S.A.
   3  * Copyright 2017 Mellanox Technologies, Ltd
   4  */
   5
   6 #include <stdbool.h>
   7
   8 #include <rte_alarm.h>
   9 #include <rte_malloc.h>
  10 #include <rte_ethdev_driver.h>
  11 #include <rte_ethdev_vdev.h>
  12 #include <rte_devargs.h>
  13 #include <rte_kvargs.h>
  14 #include <rte_bus_vdev.h>
  15
  16 #include "failsafe_private.h"
  17
  18 int failsafe_logtype;
  19
  20 const char pmd_failsafe_driver_name[] = FAILSAFE_DRIVER_NAME;
  21 static const struct rte_eth_link eth_link = {
  22         .link_speed = ETH_SPEED_NUM_10G,
  23         .link_duplex = ETH_LINK_FULL_DUPLEX,
  24         .link_status = ETH_LINK_UP,
  25         .link_autoneg = ETH_LINK_AUTONEG,
  26 };
  27
  28 static int
  29 fs_sub_device_alloc(struct rte_eth_dev *dev,
  30                 const char *params)
  31 {
  32         uint8_t nb_subs;
  33         int ret;
  34         int i;
  35         struct sub_device *sdev;
  36         uint8_t sdev_iterator;
  37
  38         ret = failsafe_args_count_subdevice(dev, params);
  39         if (ret)
  40                 return ret;
  41         if (PRIV(dev)->subs_tail > FAILSAFE_MAX_ETHPORTS) {
  42                 ERROR("Cannot allocate more than %d ports",
  43                         FAILSAFE_MAX_ETHPORTS);
  44                 return -ENOSPC;
  45         }
  46         nb_subs = PRIV(dev)->subs_tail;
  47         PRIV(dev)->subs = rte_zmalloc(NULL,
  48                         sizeof(struct sub_device) * nb_subs,
  49                         RTE_CACHE_LINE_SIZE);
  50         if (PRIV(dev)->subs == NULL) {
  51                 ERROR("Could not allocate sub_devices");
  52                 return -ENOMEM;
  53         }
  54         /* Initiate static sub devices linked list. */
  55         for (i = 1; i < nb_subs; i++)
  56                 PRIV(dev)->subs[i - 1].next = PRIV(dev)->subs + i;
  57         PRIV(dev)->subs[i - 1].next = PRIV(dev)->subs;
  58
  59         FOREACH_SUBDEV(sdev, sdev_iterator, dev) {
  60                 sdev->sdev_port_id = RTE_MAX_ETHPORTS;
  61         }
  62         return 0;
  63 }
  64
  65 static void
  66 fs_sub_device_free(struct rte_eth_dev *dev)
  67 {
  68         rte_free(PRIV(dev)->subs);
  69 }
  70
  71 static void fs_hotplug_alarm(void *arg);
  72
  73 int
  74 failsafe_hotplug_alarm_install(struct rte_eth_dev *dev)
  75 {
  76         int ret;
  77
  78         if (dev == NULL)
  79                 return -EINVAL;
  80         if (PRIV(dev)->pending_alarm)
  81                 return 0;
  82         ret = rte_eal_alarm_set(failsafe_hotplug_poll * 1000,
  83                                 fs_hotplug_alarm,
  84                                 dev);
  85         if (ret) {
  86                 ERROR("Could not set up plug-in event detection");
  87                 return ret;
  88         }
  89         PRIV(dev)->pending_alarm = 1;
  90         return 0;
  91 }
  92
  93 int
  94 failsafe_hotplug_alarm_cancel(struct rte_eth_dev *dev)
  95 {
  96         int ret = 0;
  97
  98         rte_errno = 0;
  99         rte_eal_alarm_cancel(fs_hotplug_alarm, dev);
 100         if (rte_errno) {
 101                 ERROR("rte_eal_alarm_cancel failed (errno: %s)",
 102                       strerror(rte_errno));
 103                 ret = -rte_errno;
 104         } else {
 105                 PRIV(dev)->pending_alarm = 0;
 106         }
 107         return ret;
 108 }
 109
 110 static void
 111 fs_hotplug_alarm(void *arg)
 112 {
 113         struct rte_eth_dev *dev = arg;
 114         struct sub_device *sdev;
 115         int ret;
 116         uint8_t i;
 117
 118         if (!PRIV(dev)->pending_alarm)
 119                 return;
 120         PRIV(dev)->pending_alarm = 0;
 121         FOREACH_SUBDEV(sdev, i, dev)
 122                 if (sdev->state != PRIV(dev)->state)
 123                         break;
 124         /* if we have non-probed device */
 125         if (i != PRIV(dev)->subs_tail) {
 126                 if (fs_lock(dev, 1) != 0)
 127                         goto reinstall;
 128                 ret = failsafe_eth_dev_state_sync(dev);
 129                 fs_unlock(dev, 1);
 130                 if (ret)
 131                         ERROR("Unable to synchronize sub_device state");
 132         }
 133         failsafe_dev_remove(dev);
 134 reinstall:
 135         ret = failsafe_hotplug_alarm_install(dev);
 136         if (ret)
 137                 ERROR("Unable to set up next alarm");
 138 }
 139
 140 static int
 141 fs_mutex_init(struct fs_priv *priv)
 142 {
 143         int ret;
 144         pthread_mutexattr_t attr;
 145
 146         ret = pthread_mutexattr_init(&attr);
 147         if (ret) {
 148                 ERROR("Cannot initiate mutex attributes - %s", strerror(ret));
 149                 return ret;
 150         }
 151         /* Allow mutex relocks for the thread holding the mutex. */
 152         ret = pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
 153         if (ret) {
 154                 ERROR("Cannot set mutex type - %s", strerror(ret));
 155                 return ret;
 156         }
 157         ret = pthread_mutex_init(&priv->hotplug_mutex, &attr);
 158         if (ret) {
 159                 ERROR("Cannot initiate mutex - %s", strerror(ret));
 160                 return ret;
 161         }
 162         return 0;
 163 }
 164
 165 static int
 166 fs_eth_dev_create(struct rte_vdev_device *vdev)
 167 {
 168         struct rte_eth_dev *dev;
 169         struct rte_ether_addr *mac;
 170         struct fs_priv *priv;
 171         struct sub_device *sdev;
 172         const char *params;
 173         unsigned int socket_id;
 174         uint8_t i;
 175         int ret;
 176
 177         dev = NULL;
 178         priv = NULL;
 179         socket_id = rte_socket_id();
 180         INFO("Creating fail-safe device on NUMA socket %u", socket_id);
 181         params = rte_vdev_device_args(vdev);
 182         if (params == NULL) {
 183                 ERROR("This PMD requires sub-devices, none provided");
 184                 return -1;
 185         }
 186         dev = rte_eth_vdev_allocate(vdev, sizeof(*priv));
 187         if (dev == NULL) {
 188                 ERROR("Unable to allocate rte_eth_dev");
 189                 return -1;
 190         }
 191         priv = PRIV(dev);
 192         priv->data = dev->data;
 193         dev->dev_ops = &failsafe_ops;
 194         dev->data->mac_addrs = &PRIV(dev)->mac_addrs[0];
 195         dev->data->dev_link = eth_link;
 196         PRIV(dev)->nb_mac_addr = 1;
 197         TAILQ_INIT(&PRIV(dev)->flow_list);
 198         dev->rx_pkt_burst = (eth_rx_burst_t)&failsafe_rx_burst;
 199         dev->tx_pkt_burst = (eth_tx_burst_t)&failsafe_tx_burst;
 200         ret = fs_sub_device_alloc(dev, params);
 201         if (ret) {
 202                 ERROR("Could not allocate sub_devices");
 203                 goto free_dev;
 204         }
 205         ret = failsafe_args_parse(dev, params);
 206         if (ret)
 207                 goto free_subs;
 208         ret = rte_eth_dev_owner_new(&priv->my_owner.id);
 209         if (ret) {
 210                 ERROR("Failed to get unique owner identifier");
 211                 goto free_args;
 212         }
 213         snprintf(priv->my_owner.name, sizeof(priv->my_owner.name),
 214                  FAILSAFE_OWNER_NAME);
 215         DEBUG("Failsafe port %u owner info: %s_%016"PRIX64, dev->data->port_id,
 216               priv->my_owner.name, priv->my_owner.id);
 217         ret = rte_eth_dev_callback_register(RTE_ETH_ALL, RTE_ETH_EVENT_NEW,
 218                                             failsafe_eth_new_event_callback,
 219                                             dev);
 220         if (ret) {
 221                 ERROR("Failed to register NEW callback");
 222                 goto free_args;
 223         }
 224         ret = failsafe_eal_init(dev);
 225         if (ret)
 226                 goto unregister_new_callback;
 227         ret = fs_mutex_init(priv);
 228         if (ret)
 229                 goto unregister_new_callback;
 230         ret = failsafe_hotplug_alarm_install(dev);
 231         if (ret) {
 232                 ERROR("Could not set up plug-in event detection");
 233                 goto unregister_new_callback;
 234         }
 235         mac = &dev->data->mac_addrs[0];
 236         if (failsafe_mac_from_arg) {
 237                 /*
 238                  * If MAC address was provided as a parameter,
 239                  * apply to all probed slaves.
 240                  */
 241                 FOREACH_SUBDEV_STATE(sdev, i, dev, DEV_PROBED) {
 242                         ret = rte_eth_dev_default_mac_addr_set(PORT_ID(sdev),
 243                                                                mac);
 244                         if (ret) {
 245                                 ERROR("Failed to set default MAC address");
 246                                 goto cancel_alarm;
 247                         }
 248                 }
 249         } else {
 250                 /*
 251                  * Use the ether_addr from first probed
 252                  * device, either preferred or fallback.
 253                  */
 254                 FOREACH_SUBDEV(sdev, i, dev)
 255                         if (sdev->state >= DEV_PROBED) {
 256                                 ether_addr_copy(&ETH(sdev)->data->mac_addrs[0],
 257                                                 mac);
 258                                 break;
 259                         }
 260                 /*
 261                  * If no device has been probed and no ether_addr
 262                  * has been provided on the command line, use a random
 263                  * valid one.
 264                  * It will be applied during future slave state syncs to
 265                  * probed slaves.
 266                  */
 267                 if (i == priv->subs_tail)
 268                         eth_random_addr(&mac->addr_bytes[0]);
 269         }
 270         INFO("MAC address is %02x:%02x:%02x:%02x:%02x:%02x",
 271                 mac->addr_bytes[0], mac->addr_bytes[1],
 272                 mac->addr_bytes[2], mac->addr_bytes[3],
 273                 mac->addr_bytes[4], mac->addr_bytes[5]);
 274         dev->data->dev_flags |= RTE_ETH_DEV_INTR_LSC;
 275         PRIV(dev)->intr_handle = (struct rte_intr_handle){
 276                 .fd = -1,
 277                 .type = RTE_INTR_HANDLE_EXT,
 278         };
 279         rte_eth_dev_probing_finish(dev);
 280         return 0;
 281 cancel_alarm:
 282         failsafe_hotplug_alarm_cancel(dev);
 283 unregister_new_callback:
 284         rte_eth_dev_callback_unregister(RTE_ETH_ALL, RTE_ETH_EVENT_NEW,
 285                                         failsafe_eth_new_event_callback, dev);
 286 free_args:
 287         failsafe_args_free(dev);
 288 free_subs:
 289         fs_sub_device_free(dev);
 290 free_dev:
 291         /* mac_addrs must not be freed alone because part of dev_private */
 292         dev->data->mac_addrs = NULL;
 293         rte_eth_dev_release_port(dev);
 294         return -1;
 295 }
 296
 297 static int
 298 fs_rte_eth_free(const char *name)
 299 {
 300         struct rte_eth_dev *dev;
 301         int ret;
 302
 303         dev = rte_eth_dev_allocated(name);
 304         if (dev == NULL)
 305                 return -ENODEV;
 306         rte_eth_dev_callback_unregister(RTE_ETH_ALL, RTE_ETH_EVENT_NEW,
 307                                         failsafe_eth_new_event_callback, dev);
 308         ret = failsafe_eal_uninit(dev);
 309         if (ret)
 310                 ERROR("Error while uninitializing sub-EAL");
 311         failsafe_args_free(dev);
 312         fs_sub_device_free(dev);
 313         ret = pthread_mutex_destroy(&PRIV(dev)->hotplug_mutex);
 314         if (ret)
 315                 ERROR("Error while destroying hotplug mutex");
 316         rte_free(PRIV(dev)->mcast_addrs);
 317         /* mac_addrs must not be freed alone because part of dev_private */
 318         dev->data->mac_addrs = NULL;
 319         rte_eth_dev_release_port(dev);
 320         return ret;
 321 }
 322
 323 static bool
 324 devargs_already_listed(struct rte_devargs *devargs)
 325 {
 326         struct rte_devargs *list_da;
 327
 328         RTE_EAL_DEVARGS_FOREACH(devargs->bus->name, list_da) {
 329                 if (strcmp(list_da->name, devargs->name) == 0)
 330                         /* devargs already in the list */
 331                         return true;
 332         }
 333         return false;
 334 }
 335
 336 static int
 337 rte_pmd_failsafe_probe(struct rte_vdev_device *vdev)
 338 {
 339         const char *name;
 340         struct rte_eth_dev *eth_dev;
 341         struct sub_device  *sdev;
 342         struct rte_devargs devargs;
 343         uint8_t i;
 344         int ret;
 345
 346         name = rte_vdev_device_name(vdev);
 347         INFO("Initializing " FAILSAFE_DRIVER_NAME " for %s",
 348                         name);
 349
 350         if (rte_eal_process_type() == RTE_PROC_SECONDARY &&
 351             strlen(rte_vdev_device_args(vdev)) == 0) {
 352                 eth_dev = rte_eth_dev_attach_secondary(name);
 353                 if (!eth_dev) {
 354                         ERROR("Failed to probe %s", name);
 355                         return -1;
 356                 }
 357                 eth_dev->dev_ops = &failsafe_ops;
 358                 eth_dev->device = &vdev->device;
 359                 eth_dev->rx_pkt_burst = (eth_rx_burst_t)&failsafe_rx_burst;
 360                 eth_dev->tx_pkt_burst = (eth_tx_burst_t)&failsafe_tx_burst;
 361                 /*
 362                  * Failsafe will attempt to probe all of its sub-devices.
 363                  * Any failure in sub-devices is not a fatal error.
 364                  * A sub-device can be plugged later.
 365                  */
 366                 FOREACH_SUBDEV(sdev, i, eth_dev) {
 367                         /* rebuild devargs to be able to get the bus name. */
 368                         ret = rte_devargs_parse(&devargs,
 369                                                 sdev->devargs.name);
 370                         if (ret != 0) {
 371                                 ERROR("Failed to parse devargs %s",
 372                                         devargs.name);
 373                                 continue;
 374                         }
 375                         if (!devargs_already_listed(&devargs)) {
 376                                 ret = rte_dev_probe(devargs.name);
 377                                 if (ret != 0) {
 378                                         ERROR("Failed to probe devargs %s",
 379                                               devargs.name);
 380                                         continue;
 381                                 }
 382                         }
 383                 }
 384                 rte_eth_dev_probing_finish(eth_dev);
 385                 return 0;
 386         }
 387
 388         return fs_eth_dev_create(vdev);
 389 }
 390
 391 static int
 392 rte_pmd_failsafe_remove(struct rte_vdev_device *vdev)
 393 {
 394         const char *name;
 395
 396         name = rte_vdev_device_name(vdev);
 397         INFO("Uninitializing " FAILSAFE_DRIVER_NAME " for %s", name);
 398         return fs_rte_eth_free(name);
 399 }
 400
 401 static struct rte_vdev_driver failsafe_drv = {
 402         .probe = rte_pmd_failsafe_probe,
 403         .remove = rte_pmd_failsafe_remove,
 404 };
 405
 406 RTE_PMD_REGISTER_VDEV(net_failsafe, failsafe_drv);
 407 RTE_PMD_REGISTER_PARAM_STRING(net_failsafe, PMD_FAILSAFE_PARAM_STRING);
 408
 409 RTE_INIT(failsafe_init_log)
 410 {
 411         failsafe_logtype = rte_log_register("pmd.net.failsafe");
 412         if (failsafe_logtype >= 0)
 413                 rte_log_set_level(failsafe_logtype, RTE_LOG_NOTICE);
 414 }