netdev - [net-next PATCH] igb: allow tx of pre-formatted vlan tagged packets

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20090312213345.GA12653@ajones-laptop.nbttech.com>
Date:	Thu, 12 Mar 2009 14:33:45 -0700
From:	Arthur Jones <ajones@...erbed.com>
To:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
CC:	<e1000-devel@...ts.sourceforge.net>, <netdev@...r.kernel.org>,
	Stephen Hemminger <shemminger@...tta.com>
Subject: [net-next PATCH] 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 <kand@...erbed.com> for discovering the
issue and the coming up with a solution.  This patch is
based upon his work.

Macro fixups from Stephen Hemminger <shemminger@...tta.com>

Signed-off-by: Arthur Jones <ajones@...erbed.com>
---
 drivers/net/igb/igb_main.c |   12 +++++++++++-
 1 files changed, 11 insertions(+), 1 deletions(-)

diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index 78558f8..e4ef1f6 100644
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -3017,7 +3017,17 @@ 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)
-- 
1.5.6.3
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html