[PATCH 5.7 173/265] wireguard: receive: account for napi_gro_receive never returning GRO_DROP

Sasha Levin
2020-06-29T21:57:15Z

From: "Jason A. Donenfeld" <Jason@zx2c4.com>

[ Upstream commit df08126e3833e9dca19e2407db5f5860a7c194fb ]

The napi_gro_receive function no longer returns GRO_DROP ever, making
handling GRO_DROP dead code. This commit removes that dead code.
Further, it's not even clear that device drivers have any business in
taking action after passing off received packets; that's arguably out of
their hands.

Fixes: e7096c131e51 ("net: WireGuard secure network tunnel")
Fixes: 6570bc79c0df ("net: core: use listified Rx for GRO_NORMAL in napi_gro_receive()")
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/wireguard/receive.c | 10 ++--------
1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/drivers/net/wireguard/receive.c b/drivers/net/wireguard/receive.c
index 91438144e4f7a..9b2ab6fc91cdd 100644
--- a/drivers/net/wireguard/receive.c
+++ b/drivers/net/wireguard/receive.c
@@ -414,14 +414,8 @@ static void wg_packet_consume_data_done(struct wg_peer *peer,
if (unlikely(routed_peer != peer))
goto dishonest_packet_peer;

- if (unlikely(napi_gro_receive(&peer->napi, skb) == GRO_DROP)) {
- ++dev->stats.rx_dropped;
- net_dbg_ratelimited("%s: Failed to give packet to userspace from peer %llu (%pISpfsc)\n",
- dev->name, peer->internal_id,
- &peer->endpoint.addr);
- } else {
- update_rx_stats(peer, message_data_len(len_before_trim));
- }
+ napi_gro_receive(&peer->napi, skb);
+ update_rx_stats(peer, message_data_len(len_before_trim));
return;

dishonest_packet_peer:
--
2.25.1