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vxlan: Read jiffies once when updating FDB 'used' time

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Avoid two volatile reads in the data path. Instead, read jiffies once
and only if an FDB entry was found.

Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org>
Link: https://patch.msgid.link/20250204145549.1216254-3-idosch@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Ido Schimmel 2025-02-04 16:55:43 +02:00 committed by Jakub Kicinski
parent f6205f8215
commit 1370c45d6e
1 changed files with 6 additions and 2 deletions
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8
drivers/net/vxlan/vxlan_core.c
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@ -434,8 +434,12 @@ static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
struct vxlan_fdb *f;
f = __vxlan_find_mac(vxlan, mac, vni);
if (f && READ_ONCE(f->used) != jiffies)
WRITE_ONCE(f->used, jiffies);
if (f) {
unsigned long now = jiffies;
if (READ_ONCE(f->used) != now)
WRITE_ONCE(f->used, now);
}
return f;
}