target/linux/generic/backport-5.4/080-wireguard-0120-wireguard-peer-put-frequently-used-members-above-cac.patch

   1 From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
   2 From: "Jason A. Donenfeld" <Jason@zx2c4.com>
   3 Date: Mon, 22 Feb 2021 17:25:46 +0100
   4 Subject: [PATCH] wireguard: peer: put frequently used members above cache
   5  lines
   6
   7 commit 5a0598695634a6bb4126818902dd9140cd9df8b6 upstream.
   8
   9 The is_dead boolean is checked for every single packet, while the
  10 internal_id member is used basically only for pr_debug messages. So it
  11 makes sense to hoist up is_dead into some space formerly unused by a
  12 struct hole, while demoting internal_api to below the lowest struct
  13 cache line.
  14
  15 Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
  16 Signed-off-by: Jakub Kicinski <kuba@kernel.org>
  17 Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
  18 ---
  19  drivers/net/wireguard/peer.h | 4 ++--
  20  1 file changed, 2 insertions(+), 2 deletions(-)
  21
  22 --- a/drivers/net/wireguard/peer.h
  23 +++ b/drivers/net/wireguard/peer.h
  24 @@ -39,6 +39,7 @@ struct wg_peer {
  25         struct crypt_queue tx_queue, rx_queue;
  26         struct sk_buff_head staged_packet_queue;
  27         int serial_work_cpu;
  28 +       bool is_dead;
  29         struct noise_keypairs keypairs;
  30         struct endpoint endpoint;
  31         struct dst_cache endpoint_cache;
  32 @@ -61,9 +62,8 @@ struct wg_peer {
  33         struct rcu_head rcu;
  34         struct list_head peer_list;
  35         struct list_head allowedips_list;
  36 -       u64 internal_id;
  37         struct napi_struct napi;
  38 -       bool is_dead;
  39 +       u64 internal_id;
  40  };
  41
  42  struct wg_peer *wg_peer_create(struct wg_device *wg,