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

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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 <[email protected]>
Cc: Wei Liu <[email protected]>
Cc: David Vrabel <[email protected]>
Acked-by: Ian Campbell <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Paul Durrant 2013-10-16 17:50:31 +01:00 • committed by David S. Miller
commit a946858768
3 changed files with 24 additions and 4 deletions
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10
include/xen/interface/io/netif.h
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@ -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