xen-netback: add support for IPv6 checksum offload to guest

Check xenstore flag feature-ipv6-csum-offload to determine if a
guest is happy to accept IPv6 packets with only partial checksum.

Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Cc: Wei Liu <wei.liu2@citrix.com>
Cc: David Vrabel <david.vrabel@citrix.com>
Cc: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/net/xen-netback/xenbus.c b/drivers/net/xen-netback/xenbus.c
index 1b08d8798372..ad27b15242cd 100644
--- a/drivers/net/xen-netback/xenbus.c
+++ b/drivers/net/xen-netback/xenbus.c
@@ -574,7 +574,12 @@ static int connect_rings(struct backend_info *be)
         if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-no-csum-offload",
                          "%d", &val) < 0)
                 val = 0;
-        vif->csum = !val;
+        vif->ip_csum = !val;
+
+        if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-ipv6-csum-offload",
+                         "%d", &val) < 0)
+                val = 0;
+        vif->ipv6_csum = !!val;
 
         /* Map the shared frame, irq etc. */
         err = xenvif_connect(vif, tx_ring_ref, rx_ring_ref,