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xen-netback: handle IPv6 TCP GSO packets from the guest

Browse source 
This patch adds a xenstore feature flag, festure-gso-tcpv6, to advertise
that netback can handle IPv6 TCP GSO packets. It creates SKB_GSO_TCPV6 skbs
if the frontend passes an extra segment with the new type
XEN_NETIF_GSO_TYPE_TCPV6 added to netif.h.

Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Cc: Wei Liu <wei.liu2@citrix.com>
Cc: David Vrabel <david.vrabel@citrix.com>
Acked-by: 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 17:50:31 +01:00 committed by David S. Miller
parent 7365bcfa32
commit a946858768
3 changed files with 24 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

11
drivers/net/xen-netback/netback.c
View file

@ -1098,15 +1098,20 @@ static int xenvif_set_skb_gso(struct xenvif *vif,
return -EINVAL;
}
/* Currently only TCPv4 S.O. is supported. */
if (gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV4) {
switch (gso->u.gso.type) {
case XEN_NETIF_GSO_TYPE_TCPV4:
skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
break;
case XEN_NETIF_GSO_TYPE_TCPV6:
skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
break;
default:
netdev_err(vif->dev, "Bad GSO type %d.\n", gso->u.gso.type);
xenvif_fatal_tx_err(vif);
return -EINVAL;
}
skb_shinfo(skb)->gso_size = gso->u.gso.size;
skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
/* Header must be checked, and gso_segs computed. */
skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;

7
drivers/net/xen-netback/xenbus.c
View file

@ -105,6 +105,13 @@ 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",

10
include/xen/interface/io/netif.h
View file

@ -57,6 +57,13 @@
* offload on or off. If it is missing then the feature is assumed to be off.
*/
/*
* "feature-gso-tcpv4" and "feature-gso-tcpv6" advertise the capability to
* handle large TCP packets (in IPv4 or IPv6 form respectively). Neither
* frontends nor backends are assumed to be capable unless the flags are
* present.
*/
/*
* This is the 'wire' format for packets:
* Request 1: xen_netif_tx_request -- XEN_NETTXF_* (any flags)
@ -102,8 +109,9 @@ struct xen_netif_tx_request {
#define _XEN_NETIF_EXTRA_FLAG_MORE (0)
#define XEN_NETIF_EXTRA_FLAG_MORE (1U<<_XEN_NETIF_EXTRA_FLAG_MORE)
/* GSO types - only TCPv4 currently supported. */
/* GSO types */
#define XEN_NETIF_GSO_TYPE_TCPV4 (1)
#define XEN_NETIF_GSO_TYPE_TCPV6 (2)
/*
* This structure needs to fit within both netif_tx_request and