direct-io.hg

changeset 8632:911b6d8cd666

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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@gondor.com>
author kaf24@firebug.cl.cam.ac.uk
date Thu Jan 19 20:11:09 2006 +0100 (2006-01-19)
parents 8a3549172896
children c4ae9456a459
files linux-2.6-xen-sparse/drivers/xen/netback/loopback.c
line diff
     1.1 --- a/linux-2.6-xen-sparse/drivers/xen/netback/loopback.c	Thu Jan 19 20:04:53 2006 +0100
     1.2 +++ b/linux-2.6-xen-sparse/drivers/xen/netback/loopback.c	Thu Jan 19 20:11:09 2006 +0100
     1.3 @@ -27,6 +27,7 @@
     1.4  #include <linux/inetdevice.h>
     1.5  #include <linux/etherdevice.h>
     1.6  #include <linux/skbuff.h>
     1.7 +#include <linux/ethtool.h>
     1.8  #include <net/dst.h>
     1.9  
    1.10  static int nloopbacks = 8;
    1.11 @@ -122,6 +123,12 @@ static void loopback_construct(struct ne
    1.12  	/*dev->mtu             = 16*1024;*/
    1.13  }
    1.14  
    1.15 +static struct ethtool_ops network_ethtool_ops =
    1.16 +{
    1.17 +	.get_tx_csum = ethtool_op_get_tx_csum,
    1.18 +	.set_tx_csum = ethtool_op_set_tx_csum,
    1.19 +};
    1.20 +
    1.21  static int __init make_loopback(int i)
    1.22  {
    1.23  	struct net_device *dev1, *dev2;
    1.24 @@ -141,6 +148,8 @@ static int __init make_loopback(int i)
    1.25  	dev1->features |= NETIF_F_NO_CSUM;
    1.26  	dev2->features |= NETIF_F_IP_CSUM;
    1.27  
    1.28 +	SET_ETHTOOL_OPS(dev2, &network_ethtool_ops);
    1.29 +
    1.30  	/*
    1.31  	 * Initialise a dummy MAC address for the 'dummy backend' interface. We
    1.32  	 * choose the numerically largest non-broadcast address to prevent the