xen-netback: enable IPv6 TCP GSO to the guest

[cascardo/linux.git] / drivers / net / xen-netback / xenbus.c

diff --git a/drivers/net/xen-netback/xenbus.c b/drivers/net/xen-netback/xenbus.c
index b45bce2..f035899 100644 (file)
--- a/drivers/net/xen-netback/xenbus.c
+++ b/drivers/net/xen-netback/xenbus.c
@@ -39,11 +39,15 @@ static int connect_rings(struct backend_info *);
 static void connect(struct backend_info *);
 static void backend_create_xenvif(struct backend_info *be);
 static void unregister_hotplug_status_watch(struct backend_info *be);
+static void set_backend_state(struct backend_info *be,
+                             enum xenbus_state state);
 
 static int netback_remove(struct xenbus_device *dev)
 {
        struct backend_info *be = dev_get_drvdata(&dev->dev);
 
+       set_backend_state(be, XenbusStateClosed);
+
        unregister_hotplug_status_watch(be);
        if (be->vif) {
                kobject_uevent(&dev->dev.kobj, KOBJ_OFFLINE);
@@ -101,6 +105,22 @@ static int netback_probe(struct xenbus_device *dev,
                        goto abort_transaction;
                }
 
+               err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv6",
+                                   "%d", sg);
+               if (err) {
+                       message = "writing feature-gso-tcpv6";
+                       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);
@@ -557,20 +577,50 @@ static int connect_rings(struct backend_info *be)
                val = 0;
        vif->can_sg = !!val;
 
+       vif->gso_mask = 0;
+       vif->gso_prefix_mask = 0;
+
        if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv4",
                         "%d", &val) < 0)
                val = 0;
-       vif->gso = !!val;
+       if (val)
+               vif->gso_mask |= GSO_BIT(TCPV4);
 
        if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv4-prefix",
                         "%d", &val) < 0)
                val = 0;
-       vif->gso_prefix = !!val;
+       if (val)
+               vif->gso_prefix_mask |= GSO_BIT(TCPV4);
+
+       if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv6",
+                        "%d", &val) < 0)
+               val = 0;
+       if (val)
+               vif->gso_mask |= GSO_BIT(TCPV6);
+
+       if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv6-prefix",
+                        "%d", &val) < 0)
+               val = 0;
+       if (val)
+               vif->gso_prefix_mask |= GSO_BIT(TCPV6);
+
+       if (vif->gso_mask & vif->gso_prefix_mask) {
+               xenbus_dev_fatal(dev, err,
+                                "%s: gso and gso prefix flags are not "
+                                "mutually exclusive",
+                                dev->otherend);
+               return -EOPNOTSUPP;
+       }
 
        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,