From c4f2082bf641d270fd518e8c218196eb26ac1c3c Mon Sep 17 00:00:00 2001 From: Ido Schimmel Date: Tue, 4 Feb 2025 16:55:44 +0200 Subject: [PATCH] vxlan: Always refresh FDB 'updated' time when learning is enabled Currently, when learning is enabled and a packet is received from the expected remote, the 'updated' field of the FDB entry is not refreshed. This will become a problem when we switch the VXLAN driver to age out entries based on the 'updated' field. Solve this by always refreshing an FDB entry when we receive a packet with a matching source MAC address, regardless if it was received via the expected remote or not as it indicates the host is alive. This is consistent with the bridge driver's FDB. Reviewed-by: Petr Machata Signed-off-by: Ido Schimmel Reviewed-by: Nikolay Aleksandrov Link: https://patch.msgid.link/20250204145549.1216254-4-idosch@nvidia.com Signed-off-by: Jakub Kicinski --- drivers/net/vxlan/vxlan_core.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/net/vxlan/vxlan_core.c b/drivers/net/vxlan/vxlan_core.c index 676a93ce3a19..36cb06a56aca 100644 --- a/drivers/net/vxlan/vxlan_core.c +++ b/drivers/net/vxlan/vxlan_core.c @@ -1466,6 +1466,10 @@ static enum skb_drop_reason vxlan_snoop(struct net_device *dev, f = vxlan_find_mac(vxlan, src_mac, vni); if (likely(f)) { struct vxlan_rdst *rdst = first_remote_rcu(f); + unsigned long now = jiffies; + + if (READ_ONCE(f->updated) != now) + WRITE_ONCE(f->updated, now); if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) && rdst->remote_ifindex == ifindex)) @@ -1485,7 +1489,6 @@ static enum skb_drop_reason vxlan_snoop(struct net_device *dev, src_mac, &rdst->remote_ip.sa, &src_ip->sa); rdst->remote_ip = *src_ip; - WRITE_ONCE(f->updated, jiffies); vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH, true, NULL); } else { u32 hash_index = fdb_head_index(vxlan, src_mac, vni); -- 2.25.1