netdev - [PATCH net-next] liquidio: do not consider packets dropped by network stack as driver Rx dropped

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Date:   Fri, 3 Nov 2017 14:32:33 -0700
From:   Felix Manlunas <felix.manlunas@...ium.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, raghu.vatsavayi@...ium.com,
        derek.chickles@...ium.com, satananda.burla@...ium.com,
        intiyaz.basha@...ium.com
Subject: [PATCH net-next] liquidio: do not consider packets dropped by
 network stack as driver Rx dropped

From: Intiyaz Basha <intiyaz.basha@...ium.com>

netdev->rx_dropped was including packets dropped by napi_gro_receive.
If a packet is dropped by network stack, it should not be counted under
driver Rx dropped.
    
Made necessary changes to not include network stack drops under
netdev->rx_dropped.

Signed-off-by: Intiyaz Basha <intiyaz.basha@...ium.com>
Signed-off-by: Satanand Burla <satananda.burla@...ium.com>
Signed-off-by: Felix Manlunas <felix.manlunas@...ium.com>
---
 drivers/net/ethernet/cavium/liquidio/lio_core.c | 15 +++------------
 1 file changed, 3 insertions(+), 12 deletions(-)

diff --git a/drivers/net/ethernet/cavium/liquidio/lio_core.c b/drivers/net/ethernet/cavium/liquidio/lio_core.c
index 89b7820..32ae63b 100644
--- a/drivers/net/ethernet/cavium/liquidio/lio_core.c
+++ b/drivers/net/ethernet/cavium/liquidio/lio_core.c
@@ -467,7 +467,6 @@ static int octeon_setup_droq(struct octeon_device *oct, int q_no, int num_descs,
 	if (netdev) {
 		struct lio *lio = GET_LIO(netdev);
 		struct octeon_device *oct = lio->oct_dev;
-		int packet_was_received;
 
 		/* Do not proceed if the interface is not in RUNNING state. */
 		if (!ifstate_check(lio, LIO_IFSTATE_RUNNING)) {
@@ -570,18 +569,10 @@ static int octeon_setup_droq(struct octeon_device *oct, int q_no, int num_descs,
 			__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vtag);
 		}
 
-		packet_was_received = (napi_gro_receive(napi, skb) != GRO_DROP);
-
-		if (packet_was_received) {
-			droq->stats.rx_bytes_received += len;
-			droq->stats.rx_pkts_received++;
-		} else {
-			droq->stats.rx_dropped++;
-			netif_info(lio, rx_err, lio->netdev,
-				   "droq:%d  error rx_dropped:%llu\n",
-				   droq->q_no, droq->stats.rx_dropped);
-		}
+		napi_gro_receive(napi, skb);
 
+		droq->stats.rx_bytes_received += len;
+		droq->stats.rx_pkts_received++;
 	} else {
 		recv_buffer_free(skb);
 	}
-- 
1.8.3.1