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be2net: Trim padded packets for Lancer

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For padded packets, Lancer computes incorrect checksum. The workaround is
to trim such packets. This workaround is mainly for IPv4 packets.

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 21:09:06 +00:00
committed by David S. Miller
parent 48265667a7
commit 3904dcc4a7
1 changed files with 3 additions and 1 deletions
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4
drivers/net/ethernet/emulex/benet/be_main.c
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@@ -860,10 +860,12 @@ static struct sk_buff *be_xmit_workarounds(struct be_adapter *adapter,
/* For padded packets, BE HW modifies tot_len field in IP header /* For padded packets, BE HW modifies tot_len field in IP header
* incorrecly when VLAN tag is inserted by HW. * incorrecly when VLAN tag is inserted by HW.
* For padded packets, Lancer computes incorrect checksum.
*/ */
eth_hdr_len = ntohs(skb->protocol) == ETH_P_8021Q ? eth_hdr_len = ntohs(skb->protocol) == ETH_P_8021Q ?
VLAN_ETH_HLEN : ETH_HLEN; VLAN_ETH_HLEN : ETH_HLEN;
if (skb->len <= 60 && vlan_tx_tag_present(skb) && if (skb->len <= 60 &&
(lancer_chip(adapter) || vlan_tx_tag_present(skb)) &&
is_ipv4_pkt(skb)) { is_ipv4_pkt(skb)) {
ip = (struct iphdr *)ip_hdr(skb); ip = (struct iphdr *)ip_hdr(skb);
pskb_trim(skb, eth_hdr_len + ntohs(ip->tot_len)); pskb_trim(skb, eth_hdr_len + ntohs(ip->tot_len));