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be2net: dont pull too much data in skb linear part 

skb_fill_rx_data() pulls 64 byte of data in skb->data

Its too much for TCP (with no options) on IPv4, as total size of headers
is 14 + 40 = 54

This means tcp stack and splice() are suboptimal, since tcp payload
is in part in tcp->data, and in part in skb frag.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Padmanabh Ratnakar <padmanabh.ratnakar@emulex.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2012-07-13 03:19:41 +00:00 committed by David S. Miller
parent d2ee62e9b5
commit ac1ae5f33f
1 changed files with 3 additions and 3 deletions
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6
drivers/net/ethernet/emulex/benet/be_main.c
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@ -1228,16 +1228,16 @@ static void skb_fill_rx_data(struct be_rx_obj *rxo, struct sk_buff *skb,
/* Copy data in the first descriptor of this completion */
curr_frag_len = min(rxcp->pkt_size, rx_frag_size);
/* Copy the header portion into skb_data */
hdr_len = min(BE_HDR_LEN, curr_frag_len);
memcpy(skb->data, start, hdr_len);
skb->len = curr_frag_len;
if (curr_frag_len <= BE_HDR_LEN) { /* tiny packet */
memcpy(skb->data, start, curr_frag_len);
/* Complete packet has now been moved to data */
put_page(page_info->page);
skb->data_len = 0;
skb->tail += curr_frag_len;
} else {
hdr_len = ETH_HLEN;
memcpy(skb->data, start, hdr_len);
skb_shinfo(skb)->nr_frags = 1;
skb_frag_set_page(skb, 0, page_info->page);
skb_shinfo(skb)->frags[0].page_offset =