netdev - [PATCH net-next 3/8] vxlan: Always refresh FDB 'updated' time when learning is enabled

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Message-ID: <20250204145549.1216254-4-idosch@nvidia.com>
Date: Tue, 4 Feb 2025 16:55:44 +0200
From: Ido Schimmel <idosch@...dia.com>
To: <netdev@...r.kernel.org>
CC: <davem@...emloft.net>, <kuba@...nel.org>, <pabeni@...hat.com>,
	<edumazet@...gle.com>, <andrew+netdev@...n.ch>, <horms@...nel.org>,
	<petrm@...dia.com>, <razor@...ckwall.org>, Ido Schimmel <idosch@...dia.com>
Subject: [PATCH net-next 3/8] 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 <petrm@...dia.com>
Signed-off-by: Ido Schimmel <idosch@...dia.com>
---
 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);
-- 
2.48.1