[PATCH net-next] net: dpaa_eth: convert to napi_gro_receive

[Rosen Penev <rosenp@gmail.com>]

Replace netif_receive_skb() with napi_gro_receive() to improve receive
performance for this driver. It has rx checksum support so routing speed
shouldn't suffer.

Tested on a WatchGuard Firebox M300.

iperf3 bidir speed test:

[ ID][Role]   Interval         Transfer      Bitrate        Retr
[  5][TX-C]   0.00-60.01  sec  5.35 GBytes   766 Mbits/sec  184    sender
[  5][TX-C]   0.00-60.02  sec  5.35 GBytes   766 Mbits/sec         receiver
[  7][RX-C]   0.00-60.01  sec  5.50 GBytes   787 Mbits/sec  124    sender
[  7][RX-C]   0.00-60.02  sec  5.49 GBytes   786 Mbits/sec         receiver

After:

[ ID][Role]   Interval         Transfer      Bitrate        Retr
[  5][TX-C]   0.00-60.01  sec  6.49 GBytes   929 Mbits/sec    0    sender
[  5][TX-C]   0.00-60.02  sec  6.49 GBytes   928 Mbits/sec         receiver
[  7][RX-C]   0.00-60.01  sec  6.55 GBytes   938 Mbits/sec    0    sender
[  7][RX-C]   0.00-60.02  sec  6.55 GBytes   937 Mbits/sec         receiver

Assisted-by: Opencode:big-pickle
Signed-off-by: Rosen Penev <rosenp@gmail.com>
---
 drivers/net/ethernet/freescale/dpaa/dpaa_eth.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
index ad2d8256eb8d..83191f636ec7 100644
--- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
+++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
@@ -2824,10 +2824,7 @@ static enum qman_cb_dqrr_result rx_default_dqrr(struct qman_portal *portal,
 
 	skb_len = skb->len;
 
-	if (unlikely(netif_receive_skb(skb) == NET_RX_DROP)) {
-		percpu_stats->rx_dropped++;
-		return qman_cb_dqrr_consume;
-	}
+	napi_gro_receive(&np->napi, skb);
 
 	percpu_stats->rx_packets++;
 	percpu_stats->rx_bytes += skb_len;
-- 
2.55.0