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wireguard: receive: reset last_under_load to zero

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This is a small optimization that prevents more expensive comparisons
from happening when they are no longer necessary, by clearing the
last_under_load variable whenever we wind up in a state where we were
under load but we no longer are.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Suggested-by: Matt Dunwoodie <ncon@noconroy.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jason A. Donenfeld 2020-02-14 23:57:21 +01:00 committed by David S. Miller
parent 04ddf1208f
commit 2a8a4df364
1 changed files with 5 additions and 2 deletions
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7
drivers/net/wireguard/receive.c
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@ -118,10 +118,13 @@ static void wg_receive_handshake_packet(struct wg_device *wg,
under_load = skb_queue_len(&wg->incoming_handshakes) >=
MAX_QUEUED_INCOMING_HANDSHAKES / 8;
if (under_load)
if (under_load) {
last_under_load = ktime_get_coarse_boottime_ns();
else if (last_under_load)
} else if (last_under_load) {
under_load = !wg_birthdate_has_expired(last_under_load, 1);
if (!under_load)
last_under_load = 0;
}
mac_state = wg_cookie_validate_packet(&wg->cookie_checker, skb,
under_load);
if ((under_load && mac_state == VALID_MAC_WITH_COOKIE) ||