From 2eba61d55e5104d0bf08ba4a9cc609613f52b4c9 Mon Sep 17 00:00:00 2001 From: Paul Durrant Date: Wed, 16 Oct 2013 17:50:29 +0100 Subject: xen-netback: add support for IPv6 checksum offload from guest For performance of VM to VM traffic on a single host it is better to avoid calculation of TCP/UDP checksum in the sending frontend. To allow this this patch adds the code necessary to set up partial checksum for IPv6 packets and xenstore flag feature-ipv6-csum-offload to advertise that fact to frontends. Signed-off-by: Paul Durrant Cc: Wei Liu Cc: David Vrabel Cc: Ian Campbell Signed-off-by: David S. Miller --- drivers/net/xen-netback/xenbus.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'drivers/net/xen-netback/xenbus.c') diff --git a/drivers/net/xen-netback/xenbus.c b/drivers/net/xen-netback/xenbus.c index ad27b15242cd..108e7523017a 100644 --- a/drivers/net/xen-netback/xenbus.c +++ b/drivers/net/xen-netback/xenbus.c @@ -105,6 +105,15 @@ static int netback_probe(struct xenbus_device *dev, goto abort_transaction; } + /* We support partial checksum setup for IPv6 packets */ + err = xenbus_printf(xbt, dev->nodename, + "feature-ipv6-csum-offload", + "%d", 1); + if (err) { + message = "writing feature-ipv6-csum-offload"; + goto abort_transaction; + } + /* We support rx-copy path. */ err = xenbus_printf(xbt, dev->nodename, "feature-rx-copy", "%d", 1); -- cgit v1.2.3