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

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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>
This commit is contained in:
Tariq Toukan 2018-04-16 17:11:07 +03:00 committed by Saeed Mahameed
parent fa698366b7
commit 386471f16b
1 changed files with 17 additions and 13 deletions
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30
drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
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@ -324,6 +324,20 @@ mlx5e_add_skb_frag(struct mlx5e_rq *rq, struct sk_buff *skb,
di->page, frag_offset, len, truesize);
}
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,
@ -331,23 +345,13 @@ mlx5e_copy_skb_header_mpwqe(struct device *pdev,
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);
}
}