drivers/net/failsafe/failsafe_eal.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright 2017 6WIND S.A.
   3  * Copyright 2017 Mellanox.
   4  */
   5
   6 #include <rte_malloc.h>
   7
   8 #include "failsafe_private.h"
   9
  10 static int
  11 fs_ethdev_portid_get(const char *name, uint16_t *port_id)
  12 {
  13         uint16_t pid;
  14         size_t len;
  15
  16         if (name == NULL) {
  17                 DEBUG("Null pointer is specified\n");
  18                 return -EINVAL;
  19         }
  20         len = strlen(name);
  21         RTE_ETH_FOREACH_DEV(pid) {
  22                 if (!strncmp(name, rte_eth_devices[pid].device->name, len)) {
  23                         *port_id = pid;
  24                         return 0;
  25                 }
  26         }
  27         return -ENODEV;
  28 }
  29
  30 static int
  31 fs_bus_init(struct rte_eth_dev *dev)
  32 {
  33         struct sub_device *sdev;
  34         struct rte_devargs *da;
  35         uint8_t i;
  36         uint16_t pid;
  37         int ret;
  38
  39         FOREACH_SUBDEV(sdev, i, dev) {
  40                 if (sdev->state != DEV_PARSED)
  41                         continue;
  42                 da = &sdev->devargs;
  43                 if (fs_ethdev_portid_get(da->name, &pid) != 0) {
  44                         ret = rte_eal_hotplug_add(da->bus->name,
  45                                                   da->name,
  46                                                   da->args);
  47                         if (ret) {
  48                                 ERROR("sub_device %d probe failed %s%s%s", i,
  49                                       rte_errno ? "(" : "",
  50                                       rte_errno ? strerror(rte_errno) : "",
  51                                       rte_errno ? ")" : "");
  52                                 continue;
  53                         }
  54                         if (fs_ethdev_portid_get(da->name, &pid) != 0) {
  55                                 ERROR("sub_device %d init went wrong", i);
  56                                 return -ENODEV;
  57                         }
  58                 } else {
  59                         char devstr[DEVARGS_MAXLEN] = "";
  60                         struct rte_devargs *probed_da =
  61                                         rte_eth_devices[pid].device->devargs;
  62
  63                         /* Take control of device probed by EAL options. */
  64                         free(da->args);
  65                         memset(da, 0, sizeof(*da));
  66                         if (probed_da != NULL)
  67                                 snprintf(devstr, sizeof(devstr), "%s,%s",
  68                                          probed_da->name, probed_da->args);
  69                         else
  70                                 snprintf(devstr, sizeof(devstr), "%s",
  71                                          rte_eth_devices[pid].device->name);
  72                         ret = rte_eal_devargs_parse(devstr, da);
  73                         if (ret) {
  74                                 ERROR("Probed devargs parsing failed with code"
  75                                       " %d", ret);
  76                                 return ret;
  77                         }
  78                         INFO("Taking control of a probed sub device"
  79                               " %d named %s", i, da->name);
  80                 }
  81                 ret = rte_eth_dev_owner_set(pid, &PRIV(dev)->my_owner);
  82                 if (ret) {
  83                         INFO("sub_device %d owner set failed (%s),"
  84                              " will try again later", i, strerror(ret));
  85                         continue;
  86                 } else if (strncmp(rte_eth_devices[pid].device->name, da->name,
  87                            strlen(da->name)) != 0) {
  88                         /*
  89                          * The device probably was removed and its port id was
  90                          * reallocated before ownership set.
  91                          */
  92                         rte_eth_dev_owner_unset(pid, PRIV(dev)->my_owner.id);
  93                         INFO("sub_device %d was probably removed before taking"
  94                              " ownership, will try again later", i);
  95                         continue;
  96                 }
  97                 ETH(sdev) = &rte_eth_devices[pid];
  98                 SUB_ID(sdev) = i;
  99                 sdev->fs_dev = dev;
 100                 sdev->dev = ETH(sdev)->device;
 101                 ETH(sdev)->state = RTE_ETH_DEV_DEFERRED;
 102                 sdev->state = DEV_PROBED;
 103         }
 104         return 0;
 105 }
 106
 107 int
 108 failsafe_eal_init(struct rte_eth_dev *dev)
 109 {
 110         int ret;
 111
 112         ret = fs_bus_init(dev);
 113         if (ret)
 114                 return ret;
 115         if (PRIV(dev)->state < DEV_PROBED)
 116                 PRIV(dev)->state = DEV_PROBED;
 117         fs_switch_dev(dev, NULL);
 118         return 0;
 119 }
 120
 121 static int
 122 fs_bus_uninit(struct rte_eth_dev *dev)
 123 {
 124         struct sub_device *sdev = NULL;
 125         uint8_t i;
 126         int sdev_ret;
 127         int ret = 0;
 128
 129         FOREACH_SUBDEV_STATE(sdev, i, dev, DEV_PROBED) {
 130                 sdev_ret = rte_eal_hotplug_remove(sdev->bus->name,
 131                                                         sdev->dev->name);
 132                 if (sdev_ret) {
 133                         ERROR("Failed to remove requested device %s (err: %d)",
 134                               sdev->dev->name, sdev_ret);
 135                         continue;
 136                 }
 137                 sdev->state = DEV_PROBED - 1;
 138         }
 139         return ret;
 140 }
 141
 142 int
 143 failsafe_eal_uninit(struct rte_eth_dev *dev)
 144 {
 145         int ret;
 146
 147         ret = fs_bus_uninit(dev);
 148         PRIV(dev)->state = DEV_PROBED - 1;
 149         return ret;
 150 }