target/linux/generic/backport-5.4/080-wireguard-0108-wireguard-receive-account-for-napi_gro_receive-never.patch

   1 From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
   2 From: "Jason A. Donenfeld" <Jason@zx2c4.com>
   3 Date: Wed, 24 Jun 2020 16:06:03 -0600
   4 Subject: [PATCH] wireguard: receive: account for napi_gro_receive never
   5  returning GRO_DROP
   6
   7 commit df08126e3833e9dca19e2407db5f5860a7c194fb upstream.
   8
   9 The napi_gro_receive function no longer returns GRO_DROP ever, making
  10 handling GRO_DROP dead code. This commit removes that dead code.
  11 Further, it's not even clear that device drivers have any business in
  12 taking action after passing off received packets; that's arguably out of
  13 their hands.
  14
  15 Fixes: e7096c131e51 ("net: WireGuard secure network tunnel")
  16 Fixes: 6570bc79c0df ("net: core: use listified Rx for GRO_NORMAL in napi_gro_receive()")
  17 Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
  18 Signed-off-by: David S. Miller <davem@davemloft.net>
  19 Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
  20 ---
  21  drivers/net/wireguard/receive.c | 10 ++--------
  22  1 file changed, 2 insertions(+), 8 deletions(-)
  23
  24 --- a/drivers/net/wireguard/receive.c
  25 +++ b/drivers/net/wireguard/receive.c
  26 @@ -414,14 +414,8 @@ static void wg_packet_consume_data_done(
  27         if (unlikely(routed_peer != peer))
  28                 goto dishonest_packet_peer;
  29
  30 -       if (unlikely(napi_gro_receive(&peer->napi, skb) == GRO_DROP)) {
  31 -               ++dev->stats.rx_dropped;
  32 -               net_dbg_ratelimited("%s: Failed to give packet to userspace from peer %llu (%pISpfsc)\n",
  33 -                                   dev->name, peer->internal_id,
  34 -                                   &peer->endpoint.addr);
  35 -       } else {
  36 -               update_rx_stats(peer, message_data_len(len_before_trim));
  37 -       }
  38 +       napi_gro_receive(&peer->napi, skb);
  39 +       update_rx_stats(peer, message_data_len(len_before_trim));
  40         return;
  41
  42  dishonest_packet_peer: