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xen-netback: enable IPv6 TCP GSO to the guest

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This patch adds code to handle SKB_GSO_TCPV6 skbs and construct appropriate
extra or prefix segments to pass the large packet to the frontend. New
xenstore flags, feature-gso-tcpv6 and feature-gso-tcpv6-prefix, are sampled
to determine if the frontend is capable of handling such packets.

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>
This commit is contained in:
Paul Durrant
2013-10-16 17:50:32 +01:00
committed by David S. Miller
parent a946858768
commit 82cada22a0
5 changed files with 77 additions and 16 deletions
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29
drivers/net/xen-netback/xenbus.c
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@@ -577,15 +577,40 @@ 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)