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net/mlx4_en: Use local var for skb_headlen(skb)

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Access skb_headlen() once in tx flow

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Amir Vadai <amirv@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2014-10-05 12:35:18 +03:00 committed by David S. Miller
parent b9d8839a44
commit e533ac7ea0
1 changed files with 11 additions and 10 deletions
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21
drivers/net/ethernet/mellanox/mlx4/en_tx.c
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@ -612,6 +612,7 @@ static void build_inline_wqe(struct mlx4_en_tx_desc *tx_desc,
{
struct mlx4_wqe_inline_seg *inl = &tx_desc->inl;
int spc = MLX4_INLINE_ALIGN - CTRL_SIZE - sizeof *inl;
unsigned int hlen = skb_headlen(skb);
if (skb->len <= spc) {
if (likely(skb->len >= MIN_PKT_LEN)) {
@ -621,19 +622,19 @@ static void build_inline_wqe(struct mlx4_en_tx_desc *tx_desc,
memset(((void *)(inl + 1)) + skb->len, 0,
MIN_PKT_LEN - skb->len);
}
skb_copy_from_linear_data(skb, inl + 1, skb_headlen(skb));
skb_copy_from_linear_data(skb, inl + 1, hlen);
if (shinfo->nr_frags)
memcpy(((void *)(inl + 1)) + skb_headlen(skb), fragptr,
memcpy(((void *)(inl + 1)) + hlen, fragptr,
skb_frag_size(&shinfo->frags[0]));
} else {
inl->byte_count = cpu_to_be32(1 << 31 | spc);
if (skb_headlen(skb) <= spc) {
skb_copy_from_linear_data(skb, inl + 1, skb_headlen(skb));
if (skb_headlen(skb) < spc) {
memcpy(((void *)(inl + 1)) + skb_headlen(skb),
fragptr, spc - skb_headlen(skb));
fragptr += spc - skb_headlen(skb);
if (hlen <= spc) {
skb_copy_from_linear_data(skb, inl + 1, hlen);
if (hlen < spc) {
memcpy(((void *)(inl + 1)) + hlen,
fragptr, spc - hlen);
fragptr += spc - hlen;
}
inl = (void *) (inl + 1) + spc;
memcpy(((void *)(inl + 1)), fragptr, skb->len - spc);
@ -641,9 +642,9 @@ static void build_inline_wqe(struct mlx4_en_tx_desc *tx_desc,
skb_copy_from_linear_data(skb, inl + 1, spc);
inl = (void *) (inl + 1) + spc;
skb_copy_from_linear_data_offset(skb, spc, inl + 1,
skb_headlen(skb) - spc);
hlen - spc);
if (shinfo->nr_frags)
memcpy(((void *)(inl + 1)) + skb_headlen(skb) - spc,
memcpy(((void *)(inl + 1)) + hlen - spc,
fragptr,
skb_frag_size(&shinfo->frags[0]));
}