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e1000: Small packets may get corrupted during padding by HW

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On PCI/PCI-X HW, if packet size is less than ETH_ZLEN,
packets may get corrupted during padding by HW.
To WA this issue, pad all small packets manually.

Signed-off-by: Tushar Dave <tushar.n.dave@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tushar Dave 2012-09-15 10:16:57 +00:00 committed by David S. Miller
parent 433a195480
commit 59d86c760f
1 changed files with 11 additions and 0 deletions
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11
drivers/net/ethernet/intel/e1000/e1000_main.c
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@ -3149,6 +3149,17 @@ static netdev_tx_t e1000_xmit_frame(struct sk_buff *skb,
return NETDEV_TX_OK;
}
/* On PCI/PCI-X HW, if packet size is less than ETH_ZLEN,
* packets may get corrupted during padding by HW.
* To WA this issue, pad all small packets manually.
*/
if (skb->len < ETH_ZLEN) {
if (skb_pad(skb, ETH_ZLEN - skb->len))
return NETDEV_TX_OK;
skb->len = ETH_ZLEN;
skb_set_tail_pointer(skb, ETH_ZLEN);
}
mss = skb_shinfo(skb)->gso_size;
/* The controller does a simple calculation to
* make sure there is enough room in the FIFO before