net/mlx5e: Use napi_alloc_skb for RX SKB allocations

Instead of netdev_alloc_skb, we use the napi_alloc_skb function
which is designated to allocate skbuff's for RX in a
channel-specific NAPI instance, and implies the IP packet alignment.
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlx5/core/en.h

@@ -93,7 +93,6 @@
 #define MLX5E_SQ_BF_BUDGET             16
 
 #define MLX5E_NUM_MAIN_GROUPS 9
-#define MLX5E_NET_IP_ALIGN 2
 
 static inline u16 mlx5_min_rx_wqes(int wq_type, u32 wq_size)
 {

drivers/net/ethernet/mellanox/mlx5/core/en_main.c

@@ -373,8 +373,8 @@ static int mlx5e_create_rq(struct mlx5e_channel *c,
 		rq->wqe_sz = (priv->params.lro_en) ?
 				priv->params.lro_wqe_sz :
 				MLX5E_SW2HW_MTU(priv->netdev->mtu);
-		rq->wqe_sz = SKB_DATA_ALIGN(rq->wqe_sz + MLX5E_NET_IP_ALIGN);
-		byte_count = rq->wqe_sz - MLX5E_NET_IP_ALIGN;
+		rq->wqe_sz = SKB_DATA_ALIGN(rq->wqe_sz);
+		byte_count = rq->wqe_sz;
 		byte_count |= MLX5_HW_START_PADDING;
 	}
 

drivers/net/ethernet/mellanox/mlx5/core/en_rx.c

@@ -47,7 +47,7 @@ int mlx5e_alloc_rx_wqe(struct mlx5e_rq *rq, struct mlx5e_rx_wqe *wqe, u16 ix)
 	struct sk_buff *skb;
 	dma_addr_t dma_addr;
 
-	skb = netdev_alloc_skb(rq->netdev, rq->wqe_sz);
+	skb = napi_alloc_skb(rq->cq.napi, rq->wqe_sz);
 	if (unlikely(!skb))
 		return -ENOMEM;
 
@@ -61,10 +61,8 @@ int mlx5e_alloc_rx_wqe(struct mlx5e_rq *rq, struct mlx5e_rx_wqe *wqe, u16 ix)
 	if (unlikely(dma_mapping_error(rq->pdev, dma_addr)))
 		goto err_free_skb;
 
-	skb_reserve(skb, MLX5E_NET_IP_ALIGN);
-
 	*((dma_addr_t *)skb->cb) = dma_addr;
-	wqe->data.addr = cpu_to_be64(dma_addr + MLX5E_NET_IP_ALIGN);
+	wqe->data.addr = cpu_to_be64(dma_addr);
 	wqe->data.lkey = rq->mkey_be;
 
 	rq->skb[ix] = skb;
@@ -701,7 +699,7 @@ void mlx5e_handle_rx_cqe_mpwrq(struct mlx5e_rq *rq, struct mlx5_cqe64 *cqe)
 		goto mpwrq_cqe_out;
 	}
 
-	skb = netdev_alloc_skb(rq->netdev,
+	skb = napi_alloc_skb(rq->cq.napi,
 			     ALIGN(MLX5_MPWRQ_SMALL_PACKET_THRESHOLD,
 				   sizeof(long)));
 	if (unlikely(!skb))