[Xen-changelog] Allow disabling the tx checksums on the xen loopback

[Xen patchbot -unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID 911b6d8cd6669b12d16edfd05b2ebfe1216e1d1e
# Parent  8a354917289690417d31c9aefea140b03bc538cf
Allow disabling the tx checksums on the xen loopback
interface, which is used for the virtual interfaces of dom0 instead 
of netfront/netback.

I need to issue ethtool -K eth0 tx off to work around a bad checksum
problem, which has been reported for domUs a few months ago. I'm
bridging dom0's eth0 to a domU where I do NAT to a different virtual
interface. Without this change, I get lots of packets with bad
checksums.

Signed-off-by: Jan Niehusmann <jan@xxxxxxxxxx>

diff -r 8a3549172896 -r 911b6d8cd666 
linux-2.6-xen-sparse/drivers/xen/netback/loopback.c
--- a/linux-2.6-xen-sparse/drivers/xen/netback/loopback.c       Thu Jan 19 
19:04:53 2006
+++ b/linux-2.6-xen-sparse/drivers/xen/netback/loopback.c       Thu Jan 19 
19:11:09 2006
@@ -27,6 +27,7 @@
 #include <linux/inetdevice.h>
 #include <linux/etherdevice.h>
 #include <linux/skbuff.h>
+#include <linux/ethtool.h>
 #include <net/dst.h>
 
 static int nloopbacks = 8;
@@ -122,6 +123,12 @@
        /*dev->mtu             = 16*1024;*/
 }
 
+static struct ethtool_ops network_ethtool_ops =
+{
+       .get_tx_csum = ethtool_op_get_tx_csum,
+       .set_tx_csum = ethtool_op_set_tx_csum,
+};
+
 static int __init make_loopback(int i)
 {
        struct net_device *dev1, *dev2;
@@ -140,6 +147,8 @@
 
        dev1->features |= NETIF_F_NO_CSUM;
        dev2->features |= NETIF_F_IP_CSUM;
+
+       SET_ETHTOOL_OPS(dev2, &network_ethtool_ops);
 
        /*
         * Initialise a dummy MAC address for the 'dummy backend' interface. We

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