netdev - [PATCH net-next 4/4] net/mlx4_en: RX csum, pre-define enabled protocols for IP status masking

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Date:   Tue, 27 Feb 2018 16:17:22 +0200
From:   Tariq Toukan <tariqt@...lanox.com>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, Eran Ben Elisha <eranbe@...lanox.com>,
        Tariq Toukan <tariqt@...lanox.com>
Subject: [PATCH net-next 4/4] net/mlx4_en: RX csum, pre-define enabled protocols for IP status masking

Pre-define a mask for IP status of a completion, that tests the
MLX4_CQE_STATUS_IPV6 only in case CONFIG_IPV6 is enabled.
Use it for IP status testing upon completion, instead of separating
the datapath into two flows.
This takes common code structures (such as closing parenthesis)
back to their original place, and makes code more readable.

Signed-off-by: Tariq Toukan <tariqt@...lanox.com>
Suggested-by: David S. Miller <davem@...emloft.net>
---
 drivers/net/ethernet/mellanox/mlx4/en_rx.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_rx.c b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
index 1e8f21b7fed8..c2c6bd7578fd 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
@@ -649,6 +649,12 @@ static int check_csum(struct mlx4_cqe *cqe, struct sk_buff *skb, void *va,
 	return get_fixed_ipv4_csum(hw_checksum, skb, hdr);
 }
 
+#if IS_ENABLED(CONFIG_IPV6)
+#define MLX4_CQE_STATUS_IP_ANY (MLX4_CQE_STATUS_IPV4 | MLX4_CQE_STATUS_IPV6)
+#else
+#define MLX4_CQE_STATUS_IP_ANY (MLX4_CQE_STATUS_IPV4)
+#endif
+
 int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int budget)
 {
 	struct mlx4_en_priv *priv = netdev_priv(dev);
@@ -835,12 +841,7 @@ int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int bud
 				ring->csum_ok++;
 			} else {
 				if (!(priv->flags & MLX4_EN_FLAG_RX_CSUM_NON_TCP_UDP &&
-				      (cqe->status & cpu_to_be16(MLX4_CQE_STATUS_IPV4 |
-#if IS_ENABLED(CONFIG_IPV6)
-								 MLX4_CQE_STATUS_IPV6))))
-#else
-								 0))))
-#endif
+				      (cqe->status & cpu_to_be16(MLX4_CQE_STATUS_IP_ANY))))
 					goto csum_none;
 				if (check_csum(cqe, skb, va, dev->features))
 					goto csum_none;
-- 
1.8.3.1