net/mlx5e: RX, Dedicate a function for copying SKB header

Get the logic of copying the packet header into the SKB linear part
into a generic function. Function does copy length alignment
and dma buffer sync.

It is currently called only within the MPWQE flow.
In a downstream patch, it will be called within the legacy RQ flow
as well.

Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
index 546e3bc..634540a 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
@@ -325,29 +325,33 @@ mlx5e_add_skb_frag(struct mlx5e_rq *rq, struct sk_buff *skb,
 }
 
 static inline void
+mlx5e_copy_skb_header(struct device *pdev, struct sk_buff *skb,
+                     struct mlx5e_dma_info *dma_info,
+                     int offset_from, int offset_to, u32 headlen)
+{
+       const void *from = page_address(dma_info->page) + offset_from;
+       /* Aligning len to sizeof(long) optimizes memcpy performance */
+       unsigned int len = ALIGN(headlen, sizeof(long));
+
+       dma_sync_single_for_cpu(pdev, dma_info->addr + offset_from, len,
+                               DMA_FROM_DEVICE);
+       skb_copy_to_linear_data_offset(skb, offset_to, from, len);
+}
+
+static inline void
 mlx5e_copy_skb_header_mpwqe(struct device *pdev,
                            struct sk_buff *skb,
                            struct mlx5e_dma_info *dma_info,
                            u32 offset, u32 headlen)
 {
        u16 headlen_pg = min_t(u32, headlen, PAGE_SIZE - offset);
-       unsigned int len;
 
-        /* Aligning len to sizeof(long) optimizes memcpy performance */
-       len = ALIGN(headlen_pg, sizeof(long));
-       dma_sync_single_for_cpu(pdev, dma_info->addr + offset, len,
-                               DMA_FROM_DEVICE);
-       skb_copy_to_linear_data(skb, page_address(dma_info->page) + offset, len);
+       mlx5e_copy_skb_header(pdev, skb, dma_info, offset, 0, headlen_pg);
 
        if (unlikely(offset + headlen > PAGE_SIZE)) {
                dma_info++;
-               headlen_pg = len;
-               len = ALIGN(headlen - headlen_pg, sizeof(long));
-               dma_sync_single_for_cpu(pdev, dma_info->addr, len,
-                                       DMA_FROM_DEVICE);
-               skb_copy_to_linear_data_offset(skb, headlen_pg,
-                                              page_address(dma_info->page),
-                                              len);
+               mlx5e_copy_skb_header(pdev, skb, dma_info, 0, headlen_pg,
+                                     headlen - headlen_pg);
        }
 }