mlx4: rx_headroom is a per port attribute

No need to duplicate it per RX queue / frags.
Signed-off-by: NEric Dumazet <edumazet@google.com>
Acked-by: NTariq Toukan <tariqt@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

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

@@ -115,7 +115,7 @@ static int mlx4_en_alloc_frags(struct mlx4_en_priv *priv,
 
 	for (i = 0; i < priv->num_frags; i++) {
 		frags[i] = ring_alloc[i];
-		frags[i].page_offset += priv->frag_info[i].rx_headroom;
+		frags[i].page_offset += priv->rx_headroom;
 		rx_desc->data[i].addr = cpu_to_be64(frags[i].dma +
 						    frags[i].page_offset);
 		ring_alloc[i] = page_alloc[i];
@@ -1202,7 +1202,7 @@ void mlx4_en_calc_rx_buf(struct net_device *dev)
 		 */
 		priv->frag_info[0].frag_stride = PAGE_SIZE;
 		priv->dma_dir = PCI_DMA_BIDIRECTIONAL;
-		priv->frag_info[0].rx_headroom = XDP_PACKET_HEADROOM;
+		priv->rx_headroom = XDP_PACKET_HEADROOM;
 		i = 1;
 	} else {
 		int buf_size = 0;
@@ -1214,12 +1214,12 @@ void mlx4_en_calc_rx_buf(struct net_device *dev)
 			priv->frag_info[i].frag_stride =
 				ALIGN(priv->frag_info[i].frag_size,
 				      SMP_CACHE_BYTES);
-			priv->frag_info[i].rx_headroom = 0;
 			buf_size += priv->frag_info[i].frag_size;
 			i++;
 		}
 		priv->rx_page_order = MLX4_EN_ALLOC_PREFER_ORDER;
 		priv->dma_dir = PCI_DMA_FROMDEVICE;
+		priv->rx_headroom = 0;
 	}
 
 	priv->num_frags = i;

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

@@ -472,7 +472,6 @@ struct mlx4_en_mc_list {
 
 struct mlx4_en_frag_info {
 	u16 frag_size;
-	u16 rx_headroom;
 	u32 frag_stride;
 };
 
@@ -585,6 +584,7 @@ struct mlx4_en_priv {
 	u8 log_rx_info;
 	u8 dma_dir;
 	u8 rx_page_order;
+	u16 rx_headroom;
 
 	struct mlx4_en_tx_ring **tx_ring[MLX4_EN_NUM_TX_TYPES];
 	struct mlx4_en_rx_ring *rx_ring[MAX_RX_RINGS];