netdev - [PATCH net 4/7] wireguard: peer: put frequently used members above cache lines

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Message-Id: <20210222162549.3252778-5-Jason@zx2c4.com>
Date:   Mon, 22 Feb 2021 17:25:46 +0100
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     netdev@...r.kernel.org, davem@...emloft.net
Subject: [PATCH net 4/7] wireguard: peer: put frequently used members above cache lines

The is_dead boolean is checked for every single packet, while the
internal_id member is used basically only for pr_debug messages. So it
makes sense to hoist up is_dead into some space formerly unused by a
struct hole, while demoting internal_api to below the lowest struct
cache line.

Fixes: e7096c131e51 ("net: WireGuard secure network tunnel")
Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>
---
 drivers/net/wireguard/peer.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireguard/peer.h b/drivers/net/wireguard/peer.h
index 23af40922997..aaff8de6e34b 100644
--- a/drivers/net/wireguard/peer.h
+++ b/drivers/net/wireguard/peer.h
@@ -39,6 +39,7 @@ struct wg_peer {
 	struct crypt_queue tx_queue, rx_queue;
 	struct sk_buff_head staged_packet_queue;
 	int serial_work_cpu;
+	bool is_dead;
 	struct noise_keypairs keypairs;
 	struct endpoint endpoint;
 	struct dst_cache endpoint_cache;
@@ -61,9 +62,8 @@ struct wg_peer {
 	struct rcu_head rcu;
 	struct list_head peer_list;
 	struct list_head allowedips_list;
-	u64 internal_id;
 	struct napi_struct napi;
-	bool is_dead;
+	u64 internal_id;
 };

 struct wg_peer *wg_peer_create(struct wg_device *wg,
-- 
2.30.1