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igb: Correcting and improving small packet check and padding 

Current implementation mess up the tail pointer. This patch sets skb->tail
correctly.
Also, the small packet check and padding is optimized by using unlikely and
calling skb_pad directly.

Signed-off-by: Tushar Dave <tushar.n.dave@intel.com>
Tested-by: Jeff Pieper <jeffrey.e.pieper@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Tushar Dave 2012-09-14 03:43:43 +00:00 committed by Jeff Kirsher
parent 374c65d666
commit ea5ceeabf5
1 changed files with 3 additions and 2 deletions
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5
drivers/net/ethernet/intel/igb/igb_main.c
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@ -4467,10 +4467,11 @@ static netdev_tx_t igb_xmit_frame(struct sk_buff *skb,
* The minimum packet size with TCTL.PSP set is 17 so pad the skb
* in order to meet this minimum size requirement.
*/
if (skb->len < 17) {
if (skb_padto(skb, 17))
if (unlikely(skb->len < 17)) {
if (skb_pad(skb, 17 - skb->len))
return NETDEV_TX_OK;
skb->len = 17;
skb_set_tail_pointer(skb, 17);
}
return igb_xmit_frame_ring(skb, igb_tx_queue_mapping(adapter, skb));