From: Arthur Jones Date: Sat, 21 Mar 2009 23:55:07 +0000 (-0700) Subject: igb: allow tx of pre-formatted vlan tagged packets X-Git-Tag: firefly_0821_release~15237^2~156 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=fa4a7ef36ec834fee1719636b30d2f28f4cb0166;p=firefly-linux-kernel-4.4.55.git igb: allow tx of pre-formatted vlan tagged packets When the 82575 is fed 802.1q packets, it chokes with an error of the form: igb 0000:08:00.1 partial checksum but 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 with the correct hardware checksum. Thanks to Kand Ly for discovering the issue and the coming up with a solution. This patch is based upon his work. Signed-off-by: Arthur Jones Signed-off-by: Jeff Kirsher Signed-off-by: David S. Miller --- diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c index 7c4481b994ab..39ac375487d6 100644 --- a/drivers/net/igb/igb_main.c +++ b/drivers/net/igb/igb_main.c @@ -3008,7 +3008,18 @@ static inline bool igb_tx_csum_adv(struct igb_adapter *adapter, tu_cmd |= (E1000_TXD_CMD_DEXT | E1000_ADVTXD_DTYP_CTXT); if (skb->ip_summed == CHECKSUM_PARTIAL) { - switch (skb->protocol) { + __be16 protocol; + + if (skb->protocol == cpu_to_be16(ETH_P_8021Q)) { + const struct vlan_ethhdr *vhdr = + (const struct vlan_ethhdr*)skb->data; + + protocol = vhdr->h_vlan_encapsulated_proto; + } else { + protocol = skb->protocol; + } + + switch (protocol) { case cpu_to_be16(ETH_P_IP): tu_cmd |= E1000_ADVTXD_TUCMD_IPV4; if (ip_hdr(skb)->protocol == IPPROTO_TCP)