netdev - [net-next PATCH] mlx4: add missed recycle opportunity for XDP

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Message-ID: <20160919073957.32059.59156.stgit@firesoul>
Date:   Mon, 19 Sep 2016 09:40:25 +0200
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     netdev@...r.kernel.org, tariqt@...lanox.com
Cc:     tom@...bertland.com, bblanco@...mgrid.com, rana.shahot@...il.com,
        "David S. Miller" <davem@...emloft.net>,
        Jesper Dangaard Brouer <brouer@...hat.com>
Subject: [net-next PATCH] mlx4: add missed recycle opportunity for XDP_TX on
 TX failure

Correct drop handling for XDP_TX on TX failure, were recently added in
commit 95357907ae73 ("mlx4: fix XDP_TX is acting like XDP_PASS on TX
ring full").

The change missed an opportunity for recycling the RX page, instead of
going through the page allocator, like the regular XDP_DROP action does.
This patch cease the opportunity, by going through the XDP_DROP case.

Fixes: 95357907ae73 ("mlx4: fix XDP_TX is acting like XDP_PASS on TX ring full")
Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com>
---
 drivers/net/ethernet/mellanox/mlx4/en_rx.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_rx.c b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
index c80073e4947f..919f0604d04a 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
@@ -906,11 +906,12 @@ int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int bud
 							length, tx_index,
 							&doorbell_pending))
 					goto consumed;
-				goto next; /* Drop on xmit failure */
+				goto xdp_drop; /* Drop on xmit failure */
 			default:
 				bpf_warn_invalid_xdp_action(act);
 			case XDP_ABORTED:
 			case XDP_DROP:
+			xdp_drop:
 				if (mlx4_en_rx_recycle(ring, frags))
 					goto consumed;
 				goto next;