[PATCH cumulus-4.1.y 4/5] vxlan: don't flush static fdb entries on admin down

[Roopa Prabhu]

From: Roopa Prabhu <ro...@cumulusnetworks.com>

This patch skips flushing static fdb entries in
ndo_stop, but flushes all fdb entries during vxlan
device delete. This is consistent with the bridge
driver fdb

Signed-off-by: Roopa Prabhu <ro...@cumulusnetworks.com>
---
 drivers/net/vxlan.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 7300586..3314090 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -2365,7 +2365,7 @@ static int vxlan_open(struct net_device *dev)
 }
 
 /* Purge the forwarding table */
-static void vxlan_flush(struct vxlan_dev *vxlan)
+static void vxlan_flush(struct vxlan_dev *vxlan, int do_all)
 {
        unsigned int h;
 
@@ -2375,6 +2375,8 @@ static void vxlan_flush(struct vxlan_dev *vxlan)
                hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
                        struct vxlan_fdb *f
                                = container_of(p, struct vxlan_fdb, hlist);
+                       if (!do_all && (f->state & (NUD_PERMANENT | NUD_NOARP)))
+                               continue;
                        /* the all_zeros_mac entry is deleted at vxlan_uninit */
                        if (!is_zero_ether_addr(f->eth_addr))
                                vxlan_fdb_destroy(vxlan, f);
@@ -2396,7 +2398,7 @@ static int vxlan_stop(struct net_device *dev)
 
        del_timer_sync(&vxlan->age_timer);
 
-       vxlan_flush(vxlan);
+       vxlan_flush(vxlan, 0);
        vxlan_sock_release(vxlan);
 
        return ret;
@@ -3069,6 +3071,8 @@ static void vxlan_dellink(struct net_device *dev, struct 
list_head *head)
        struct vxlan_dev *vxlan = netdev_priv(dev);
        struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
 
+       vxlan_flush(vxlan, 1);
+
        spin_lock(&vn->sock_lock);
        if (!hlist_unhashed(&vxlan->hlist))
                hlist_del_rcu(&vxlan->hlist);
-- 
1.9.1