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e1000e: allow tx of pre-formatted vlan tagged packets
As with igb, when the e1000e driver is fed 802.1q packets with hardware checksum on, it chokes with an error of the form: checksum_partial proto=81! As the logic there was not smart enough to look into the vlan header to pick out the encapsulated protocol. There are times when we'd like to send these packets out without having to configure a vlan on the interface. Here we check for the vlan tag and allow the packet to go out wiht the correct hardware checksum. Thanks to Kand Ly <kand@riverbed.com> for discovering the issue and the coming up with a solution. This patch is based upon his work. Fixups from Stephen Hemminger <shemminger@vyatta.com> and Alexander Duyck <alexander.h.duyck@intel.com> Signed-off-by: Arthur Jones <ajones@riverbed.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> CC: Stephen Hemminger <shemminger@vyatta.com> CC: Alexander Duyck <alexander.h.duyck@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -3764,10 +3764,16 @@ static bool e1000_tx_csum(struct e1000_adapter *adapter, struct sk_buff *skb)
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unsigned int i;
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u8 css;
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u32 cmd_len = E1000_TXD_CMD_DEXT;
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__be16 protocol;
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if (skb->ip_summed != CHECKSUM_PARTIAL)
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return 0;
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if (skb->protocol == cpu_to_be16(ETH_P_8021Q))
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protocol = vlan_eth_hdr(skb)->h_vlan_encapsulated_proto;
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else
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protocol = skb->protocol;
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switch (skb->protocol) {
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case cpu_to_be16(ETH_P_IP):
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if (ip_hdr(skb)->protocol == IPPROTO_TCP)
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@ -3780,7 +3786,8 @@ static bool e1000_tx_csum(struct e1000_adapter *adapter, struct sk_buff *skb)
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break;
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default:
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if (unlikely(net_ratelimit()))
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e_warn("checksum_partial proto=%x!\n", skb->protocol);
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e_warn("checksum_partial proto=%x!\n",
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be16_to_cpu(protocol));
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break;
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}
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