netdev - [PATCH net-next] net/mlx4_en: call gro handler for encapsulated frames

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Date:	Thu, 09 Jan 2014 10:30:13 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>, Amir Vadai <amirv@...lanox.com>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Jerry Chu <hkchu@...gle.com>
Subject: [PATCH net-next] net/mlx4_en: call gro handler for encapsulated
 frames

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

In order to use the native GRO handling of encapsulated protocols on
mlx4, we need to call napi_gro_receive() instead of netif_receive_skb()
unless busy polling is in action.

While we are at it, rename mlx4_en_cq_ll_polling() to
mlx4_en_cq_busy_polling()

Tested with GRE tunnel : GRO aggregation is now performed on the
ethernet device instead of being done later on gre device.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Amir Vadai <amirv@...lanox.com>
Cc: Jerry Chu <hkchu@...gle.com>
Cc: Or Gerlitz <ogerlitz@...lanox.com>
---
 drivers/net/ethernet/mellanox/mlx4/en_rx.c   |    8 +++++---
 drivers/net/ethernet/mellanox/mlx4/mlx4_en.h |    4 ++--
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_rx.c b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
index 3b66f26ba049..890922c1c8ee 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
@@ -724,7 +724,7 @@ int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int bud
 				 * - not an IP fragment
 				 * - no LLS polling in progress
 				 */
-				if (!mlx4_en_cq_ll_polling(cq) &&
+				if (!mlx4_en_cq_busy_polling(cq) &&
 				    (dev->features & NETIF_F_GRO)) {
 					struct sk_buff *gro_skb = napi_get_frags(&cq->napi);
 					if (!gro_skb)
@@ -816,8 +816,10 @@ int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int bud
 
 		skb_mark_napi_id(skb, &cq->napi);
 
-		/* Push it up the stack */
-		netif_receive_skb(skb);
+		if (!mlx4_en_cq_busy_polling(cq))
+			napi_gro_receive(&cq->napi, skb);
+		else
+			netif_receive_skb(skb);
 
 next:
 		for (nr = 0; nr < priv->num_frags; nr++)
diff --git a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
index 2f1e200f2e4c..fe7bdfebf353 100644
--- a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
+++ b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
@@ -661,7 +661,7 @@ static inline bool mlx4_en_cq_unlock_poll(struct mlx4_en_cq *cq)
 }
 
 /* true if a socket is polling, even if it did not get the lock */
-static inline bool mlx4_en_cq_ll_polling(struct mlx4_en_cq *cq)
+static inline bool mlx4_en_cq_busy_polling(struct mlx4_en_cq *cq)
 {
 	WARN_ON(!(cq->state & MLX4_CQ_LOCKED));
 	return cq->state & CQ_USER_PEND;
@@ -691,7 +691,7 @@ static inline bool mlx4_en_cq_unlock_poll(struct mlx4_en_cq *cq)
 	return false;
 }
 
-static inline bool mlx4_en_cq_ll_polling(struct mlx4_en_cq *cq)
+static inline bool mlx4_en_cq_busy_polling(struct mlx4_en_cq *cq)
 {
 	return false;
 }


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