From: Edward Cree <ecree@solarflare.com>
Date: Tue, 6 Aug 2019 14:53:20 +0100
Subject: sfc: don't score irq moderation points for GRO
Patch-mainline: v5.4-rc1
Git-commit: 5e040d4b1a440b832c7b4cf8116eebcdff91909c
References: jsc#SLE-8314

We already scored points when handling the RX event, no-one else does this,
 and looking at the history it appears this was originally meant to only
 score on merges, not on GRO_NORMAL.  Moreover, it gets in the way of
 changing GRO to not immediately pass GRO_NORMAL skbs to the stack.
Performance testing with four TCP streams received on a single CPU (where
 throughput was line rate of 9.4Gbps in all tests) showed a 13.7% reduction
 in RX CPU usage (n=6, p=0.03).

Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/sfc/rx.c |    5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

--- a/drivers/net/ethernet/sfc/rx.c
+++ b/drivers/net/ethernet/sfc/rx.c
@@ -412,7 +412,6 @@ efx_rx_packet_gro(struct efx_channel *ch
 		  unsigned int n_frags, u8 *eh)
 {
 	struct napi_struct *napi = &channel->napi_str;
-	gro_result_t gro_result;
 	struct efx_nic *efx = channel->efx;
 	struct sk_buff *skb;
 
@@ -449,9 +448,7 @@ efx_rx_packet_gro(struct efx_channel *ch
 
 	skb_record_rx_queue(skb, channel->rx_queue.core_index);
 
-	gro_result = napi_gro_frags(napi);
-	if (gro_result != GRO_DROP)
-		channel->irq_mod_score += 2;
+	napi_gro_frags(napi);
 }
 
 /* Allocate and construct an SKB around page fragments */