net/mlx4: rename two constants

MAX_DESC_SIZE is really the size of the bounce buffer used
when reaching the right side of TX ring buffer.

MAX_DESC_TXBBS get a MLX4_ prefix.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/mellanox/mlx4/en_tx.c

@@ -65,7 +65,7 @@ int mlx4_en_create_tx_ring(struct mlx4_en_priv *priv,
 	ring->size = size;
 	ring->size_mask = size - 1;
 	ring->sp_stride = stride;
-	ring->full_size = ring->size - HEADROOM - MAX_DESC_TXBBS;
+	ring->full_size = ring->size - HEADROOM - MLX4_MAX_DESC_TXBBS;
 
 	tmp = size * sizeof(struct mlx4_en_tx_info);
 	ring->tx_info = kvmalloc_node(tmp, GFP_KERNEL, node);
@@ -77,9 +77,11 @@ int mlx4_en_create_tx_ring(struct mlx4_en_priv *priv,
 	en_dbg(DRV, priv, "Allocated tx_info ring at addr:%p size:%d\n",
 		 ring->tx_info, tmp);
 
-	ring->bounce_buf = kmalloc_node(MAX_DESC_SIZE, GFP_KERNEL, node);
+	ring->bounce_buf = kmalloc_node(MLX4_TX_BOUNCE_BUFFER_SIZE,
+					GFP_KERNEL, node);
 	if (!ring->bounce_buf) {
-		ring->bounce_buf = kmalloc(MAX_DESC_SIZE, GFP_KERNEL);
+		ring->bounce_buf = kmalloc(MLX4_TX_BOUNCE_BUFFER_SIZE,
+					   GFP_KERNEL);
 		if (!ring->bounce_buf) {
 			err = -ENOMEM;
 			goto err_info;
@@ -909,7 +911,7 @@ 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 > MAX_DESC_TXBBS)) {
+	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;

drivers/net/ethernet/mellanox/mlx4/mlx4_en.h

@@ -90,8 +90,8 @@
 #define MLX4_EN_FILTER_EXPIRY_QUOTA 60
 
 /* Typical TSO descriptor with 16 gather entries is 352 bytes... */
-#define MAX_DESC_SIZE		512
-#define MAX_DESC_TXBBS		(MAX_DESC_SIZE / TXBB_SIZE)
+#define MLX4_TX_BOUNCE_BUFFER_SIZE 512
+#define MLX4_MAX_DESC_TXBBS	   (MLX4_TX_BOUNCE_BUFFER_SIZE / TXBB_SIZE)
 
 /*
  * OS related constants and tunables