netdev - [PATCH v3 net 2/4] wireguard: receive: reset last_under

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Message-Id: <20200214225723.63646-3-Jason@zx2c4.com>
Date:   Fri, 14 Feb 2020 23:57:21 +0100
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     davem@...emloft.net, netdev@...r.kernel.org
Cc:     "Jason A. Donenfeld" <Jason@...c4.com>,
        Matt Dunwoodie <ncon@...onroy.net>
Subject: [PATCH v3 net 2/4] wireguard: receive: reset last_under_load to zero

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@...c4.com>
Suggested-by: Matt Dunwoodie <ncon@...onroy.net>
---
 drivers/net/wireguard/receive.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireguard/receive.c b/drivers/net/wireguard/receive.c
index 9c6bab9c981f..4a153894cee2 100644
--- a/drivers/net/wireguard/receive.c
+++ b/drivers/net/wireguard/receive.c
@@ -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) ||
-- 
2.25.0