Commit 59d86c76 authored by Tushar Dave's avatar Tushar Dave Committed by David S. Miller
Browse files

e1000: Small packets may get corrupted during padding by HW 



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: default avatarTushar Dave <tushar.n.dave@intel.com>
Tested-by: default avatarAaron Brown <aaron.f.brown@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 433a1954

drivers/net/ethernet/intel/e1000/e1000_main.c

+11 −0
Original line number Diff line number Diff line
@@ -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

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