net/tap: add link up and down operations

Signed-off-by: Pascal Mazon <pascal.mazon@6wind.com>
Acked-by: Keith Wiles <keith.wiles@intel.com>

diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c
index 6a98f46..3e916a4 100644 (file)
--- a/drivers/net/tap/rte_eth_tap.c
+++ b/drivers/net/tap/rte_eth_tap.c
@@ -275,13 +275,69 @@ pmd_tx_burst(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
        return num_tx;
 }
 
+static int tap_link_set_flags(struct pmd_internals *pmd, short flags, int add)
+{
+       struct ifreq ifr;
+       int err, s;
+
+       /*
+        * An AF_INET/DGRAM socket is needed for
+        * SIOCGIFFLAGS/SIOCSIFFLAGS, using fd won't work.
+        */
+       s = socket(AF_INET, SOCK_DGRAM, 0);
+       if (s < 0) {
+               RTE_LOG(ERR, PMD,
+                       "Unable to get a socket to set flags: %s\n",
+                       strerror(errno));
+               return -1;
+       }
+       memset(&ifr, 0, sizeof(ifr));
+       strncpy(ifr.ifr_name, pmd->name, IFNAMSIZ);
+       err = ioctl(s, SIOCGIFFLAGS, &ifr);
+       if (err < 0) {
+               RTE_LOG(ERR, PMD, "Unable to get tap netdevice flags: %s\n",
+                       strerror(errno));
+               close(s);
+               return -1;
+       }
+       if (add)
+               ifr.ifr_flags |= flags;
+       else
+               ifr.ifr_flags &= ~flags;
+       err = ioctl(s, SIOCSIFFLAGS, &ifr);
+       if (err < 0) {
+               RTE_LOG(ERR, PMD, "Unable to %s flags 0x%x: %s\n",
+                       add ? "set" : "unset", flags, strerror(errno));
+               close(s);
+               return -1;
+       }
+       close(s);
+
+       return 0;
+}
+
 static int
-tap_dev_start(struct rte_eth_dev *dev)
+tap_link_set_down(struct rte_eth_dev *dev)
 {
-       /* Force the Link up */
+       struct pmd_internals *pmd = dev->data->dev_private;
+
+       dev->data->dev_link.link_status = ETH_LINK_DOWN;
+       return tap_link_set_flags(pmd, IFF_UP | IFF_NOARP, 0);
+}
+
+static int
+tap_link_set_up(struct rte_eth_dev *dev)
+{
+       struct pmd_internals *pmd = dev->data->dev_private;
+
        dev->data->dev_link.link_status = ETH_LINK_UP;
+       return tap_link_set_flags(pmd, IFF_UP | IFF_NOARP, 1);
+}
 
-       return 0;
+static int
+tap_dev_start(struct rte_eth_dev *dev)
+{
+       return tap_link_set_up(dev);
 }
 
 /* This function gets called when the current port gets stopped.
@@ -295,8 +351,7 @@ tap_dev_stop(struct rte_eth_dev *dev)
        for (i = 0; i < internals->nb_queues; i++)
                if (internals->fds[i] != -1)
                        close(internals->fds[i]);
-
-       dev->data->dev_link.link_status = ETH_LINK_DOWN;
+       tap_link_set_down(dev);
 }
 
 static int
@@ -533,6 +588,8 @@ static const struct eth_dev_ops ops = {
        .rx_queue_release       = tap_rx_queue_release,
        .tx_queue_release       = tap_tx_queue_release,
        .link_update            = tap_link_update,
+       .dev_set_link_up        = tap_link_set_up,
+       .dev_set_link_down      = tap_link_set_down,
        .stats_get              = tap_stats_get,
        .stats_reset            = tap_stats_reset,
 };