netdev - [PATCH net-next 1/2] ice: drop dead code in ice_receive

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Date:   Fri,  8 Jan 2021 03:39:02 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>
Subject: [PATCH net-next 1/2] ice: drop dead code in ice_receive_skb()

From: Eric Dumazet <edumazet@...gle.com>

napi_gro_receive() can never return GRO_DROP

GRO_DROP can only be returned from napi_gro_frags()
which is the other NAPI GRO entry point.

Followup patch will remove GRO_DROP, because drivers
are not supposed to call napi_gro_frags() if prior
napi_get_frags() has failed.

Note that I have left the gro_dropped variable. I leave to ice
maintainers the decision to further remove it from ethtool -S results.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Jesse Brandeburg <jesse.brandeburg@...el.com>
---
 drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
index bc2f4390b51dc67b2ef8cf929a6451a0259e3d51..02b12736ea80d4551d3d3460339eb0706941d22f 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
@@ -191,12 +191,7 @@ ice_receive_skb(struct ice_ring *rx_ring, struct sk_buff *skb, u16 vlan_tag)
 	if ((rx_ring->netdev->features & NETIF_F_HW_VLAN_CTAG_RX) &&
 	    (vlan_tag & VLAN_VID_MASK))
 		__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan_tag);
-	if (napi_gro_receive(&rx_ring->q_vector->napi, skb) == GRO_DROP) {
-		/* this is tracked separately to help us debug stack drops */
-		rx_ring->rx_stats.gro_dropped++;
-		netdev_dbg(rx_ring->netdev, "Receive Queue %d: Dropped packet from GRO\n",
-			   rx_ring->q_index);
-	}
+	napi_gro_receive(&rx_ring->q_vector->napi, skb);
 }
 
 /**
-- 
2.29.2.729.g45daf8777d-goog