netdev - [PATCH net-next 3/3] net/mlx4: small optimization in mlx4_en

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Date:   Tue,  6 Dec 2022 05:50:59 +0000
From:   Eric Dumazet <edumazet@...gle.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     Tariq Toukan <tariqt@...dia.com>, Wei Wang <weiwan@...gle.com>,
        netdev@...r.kernel.org, eric.dumazet@...il.com,
        Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 3/3] net/mlx4: small optimization in mlx4_en_xmit()

Test against MLX4_MAX_DESC_TXBBS only matters if the TX
bounce buffer is going to be used.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Tariq Toukan <tariqt@...dia.com>
Cc: Wei Wang <weiwan@...gle.com>
---
 drivers/net/ethernet/mellanox/mlx4/en_tx.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_tx.c b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
index 8372aeb392a28cf36a454e1b8a4783bc2b2056eb..c5758637b7bed67021a9f3e9c5283033f68639a3 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_tx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
@@ -911,11 +911,6 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
 	/* Align descriptor to TXBB size */
 	desc_size = ALIGN(real_size, TXBB_SIZE);
 	nr_txbb = desc_size >> LOG_TXBB_SIZE;
-	if (unlikely(nr_txbb > MLX4_MAX_DESC_TXBBS)) {
-		if (netif_msg_tx_err(priv))
-			en_warn(priv, "Oversized header or SG list\n");
-		goto tx_drop_count;
-	}
 
 	bf_ok = ring->bf_enabled;
 	if (skb_vlan_tag_present(skb)) {
@@ -943,6 +938,11 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
 	if (likely(index + nr_txbb <= ring->size))
 		tx_desc = ring->buf + (index << LOG_TXBB_SIZE);
 	else {
+		if (unlikely(nr_txbb > MLX4_MAX_DESC_TXBBS)) {
+			if (netif_msg_tx_err(priv))
+				en_warn(priv, "Oversized header or SG list\n");
+			goto tx_drop_count;
+		}
 		tx_desc = (struct mlx4_en_tx_desc *) ring->bounce_buf;
 		bounce = true;
 		bf_ok = false;
-- 
2.39.0.rc0.267.gcb52ba06e7-goog