[UNIKRAFT/LIBLWIP PATCH v3 07/16] plat/tap: Add tap to the bridge

[Sharan Santhanam <sharan.santhanam@xxxxxxxxx>]

The patch implements support to add the tap device to a user provided
bridge.

Signed-off-by: Sharan Santhanam <sharan.santhanam@xxxxxxxxx>
---
 plat/drivers/tap/tap.c | 60 ++++++++++++++++++++++++++++++++++++++++++
 plat/linuxu/tap_io.c   |  2 ++
 2 files changed, 62 insertions(+)

diff --git a/plat/drivers/tap/tap.c b/plat/drivers/tap/tap.c
index 5e510759..6b059943 100644
--- a/plat/drivers/tap/tap.c
+++ b/plat/drivers/tap/tap.c
@@ -174,11 +174,64 @@ static int tap_netdev_txq_info_get(struct uk_netdev *dev, 
__u16 queue_id,
                                   struct uk_netdev_queue_info *qinfo);
 static int tap_device_create(struct tap_net_dev *tdev, __u32 feature_flags);
 static int tap_mac_generate(__u8 *addr, __u8 dev_id);
+static int tap_dev_br_add(struct tap_net_dev *tdev);
+static int tap_dev_index_get(struct tap_net_dev *tdev);
 
 /**
  * Local function definitions
  */
 
+static int tap_dev_index_get(struct tap_net_dev *tdev)
+{
+       int rc = 0;
+       struct uk_ifreq ifrq = {0};
+
+       snprintf(ifrq.ifr_name, sizeof(ifrq.ifr_name), "%s",
+                    tdev->name);
+
+       rc = tap_netif_configure(tdev->ctrl_sock, UK_SIOCGIFINDEX, &ifrq);
+       if (rc < 0) {
+               uk_pr_err(DRIVER_NAME": Failed to fetch the index\n");
+               goto exit;
+       }
+
+       rc = ifrq.ifr_ifindex;
+exit:
+       return rc;
+
+}
+
+static int tap_dev_br_add(struct tap_net_dev *tdev)
+{
+       int rc = -EINVAL;
+       struct uk_ifreq ifrq = {0};
+
+       if (!tap_drv.bridge_ifs[tdev->tid])
+               goto exit;
+
+       /**
+        * Get the bridge name.
+        */
+       snprintf(ifrq.ifr_name, sizeof(ifrq.ifr_name), "%s",
+                tap_drv.bridge_ifs[tdev->tid]);
+
+       rc = tap_dev_index_get(tdev);
+       if (rc < 0)
+               return rc;
+
+       ifrq.ifr_ifindex = rc;
+       rc = tap_netif_configure(tdev->ctrl_sock, UK_SIOCBRADDIF, &ifrq);
+       if (rc < 0) {
+               uk_pr_err(DRIVER_NAME": Failed to add the interface %s to 
bridge %s\n",
+                         tdev->name, tap_drv.bridge_ifs[tdev->tid]);
+               goto exit;
+       }
+       rc = 0;
+
+exit:
+       return rc;
+}
+
 static int tap_netdev_recv(struct uk_netdev *dev,
                           struct uk_netdev_rx_queue *queue,
                           struct uk_netbuf **pkt)
@@ -409,6 +462,13 @@ static int tap_netdev_configure(struct uk_netdev *n,
                goto close_ctrl_sock;
        }
 
+       rc = tap_dev_br_add(tdev);
+       if (rc < 0) {
+               uk_pr_err(DRIVER_NAME": Failed(%d) to add the bridge 
interface\n",
+                         rc);
+               goto close_ctrl_sock;
+       }
+
        /* Initialize the tx/rx queues */
        UK_TAILQ_INIT(&tdev->rxqs);
        tdev->rxq_cnt = 0;
diff --git a/plat/linuxu/tap_io.c b/plat/linuxu/tap_io.c
index 24094f2b..fe1f52a6 100644
--- a/plat/linuxu/tap_io.c
+++ b/plat/linuxu/tap_io.c
@@ -66,8 +66,10 @@ int tap_netif_configure(int fd, __u32 request, void *arg)
        struct uk_ifreq *usr_ifr = (struct uk_ifreq *) arg;
 
        switch (request) {
+       case UK_SIOCGIFINDEX:
        case UK_SIOCGIFHWADDR:
        case UK_SIOCSIFHWADDR:
+       case UK_SIOCBRADDIF:
                break;
        default:
                rc = -EINVAL;
-- 
2.20.1