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be2net: Pad skb to meet min Tx pkt size in lancer 

In Lancer, packets that are 32 bytes or less may cause a transmit stall.
The work-around is to pad such packets to a 36 byte length.

Signed-off-by: Kalesh AP <kalesh.purayil@emulex.com>
Signed-off-by: Somnath Kotur <somnath.kotur@emulex.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Somnath Kotur 2013-05-26 21:08:47 +00:00 committed by David S. Miller
parent eeb65cedd7
commit 48265667a7
1 changed files with 10 additions and 0 deletions
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10
drivers/net/ethernet/emulex/benet/be_main.c
View File

@ -848,6 +848,16 @@ static struct sk_buff *be_xmit_workarounds(struct be_adapter *adapter,
unsigned int eth_hdr_len;
struct iphdr *ip;
/* Lancer ASIC has a bug wherein packets that are 32 bytes or less
* may cause a transmit stall on that port. So the work-around is to
* pad such packets to a 36-byte length.
*/
if (unlikely(lancer_chip(adapter) && skb->len <= 32)) {
if (skb_padto(skb, 36))
goto tx_drop;
skb->len = 36;
}
/* For padded packets, BE HW modifies tot_len field in IP header
* incorrecly when VLAN tag is inserted by HW.
*/