bridge: retry adding members after config reload / device start

The kernel will refuse to add a vlan device to a bridge when the base
device of that vlan is already a member. This can happen on config
reload.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

diff --git a/bridge.c b/bridge.c
index ce22b754f4d3f9512da2bb9f7ac1f1d7de964e56..d0cb0488b7eb93bab5e7150f48bd31b9a4aabc11 100644 (file)
--- a/bridge.c
+++ b/bridge.c
@@ -88,9 +88,11 @@ struct bridge_state {
        bool active;
        bool force_active;
 
+       struct uloop_timeout retry;
        struct bridge_member *primary_port;
        struct vlist_tree members;
        int n_present;
+       int n_failed;
 };
 
 struct bridge_member {
@@ -175,6 +177,7 @@ bridge_enable_member(struct bridge_member *bm)
        return 0;
 
 error:
+       bst->n_failed++;
        bm->present = false;
        bst->n_present--;
        return ret;
@@ -228,6 +231,15 @@ bridge_free_member(struct bridge_member *bm)
        free(bm);
 }
 
+static void
+bridge_check_retry(struct bridge_state *bst)
+{
+       if (!bst->n_failed)
+               return;
+
+       uloop_timeout_set(&bst->retry, 100);
+}
+
 static void
 bridge_member_cb(struct device_user *dev, enum device_event ev)
 {
@@ -297,8 +309,10 @@ bridge_set_up(struct bridge_state *bst)
        if (ret < 0)
                goto out;
 
+       bst->n_failed = 0;
        vlist_for_each_element(&bst->members, bm, node)
                bridge_enable_member(bm);
+       bridge_check_retry(bst);
 
        if (!bst->force_active && !bst->n_present) {
                /* initialization of all member interfaces failed */
@@ -478,6 +492,7 @@ bridge_config_init(struct device *dev)
                device_set_present(&bst->dev, true);
        }
 
+       bst->n_failed = 0;
        vlist_update(&bst->members);
        if (bst->ifnames) {
                blobmsg_for_each_attr(cur, bst->ifnames, rem) {
@@ -485,6 +500,7 @@ bridge_config_init(struct device *dev)
                }
        }
        vlist_flush(&bst->members);
+       bridge_check_retry(bst);
 }
 
 static void
@@ -581,6 +597,25 @@ bridge_reload(struct device *dev, struct blob_attr *attr)
        return ret;
 }
 
+static void
+bridge_retry_members(struct uloop_timeout *timeout)
+{
+       struct bridge_state *bst = container_of(timeout, struct bridge_state, retry);
+       struct bridge_member *bm;
+
+       bst->n_failed = 0;
+       vlist_for_each_element(&bst->members, bm, node) {
+               if (bm->present)
+                       continue;
+
+               if (!bm->dev.dev->present)
+                       continue;
+
+               bm->present = true;
+               bridge_enable_member(bm);
+       }
+}
+
 static struct device *
 bridge_create(const char *name, struct blob_attr *attr)
 {
@@ -594,6 +629,7 @@ bridge_create(const char *name, struct blob_attr *attr)
        dev = &bst->dev;
        device_init(dev, &bridge_device_type, name);
        dev->config_pending = true;
+       bst->retry.cb = bridge_retry_members;
 
        bst->set_state = dev->set_state;
        dev->set_state = bridge_set_state;