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>

diff --git a/drivers/net/ethernet/emulex/benet/be_main.c b/drivers/net/ethernet/emulex/benet/be_main.c
index 7e989d0..f18375c 100644 (file)
--- a/drivers/net/ethernet/emulex/benet/be_main.c
+++ b/drivers/net/ethernet/emulex/benet/be_main.c
@@ -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 =