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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>
This commit is contained in:
Paul Durrant 2013-10-16 17:50:28 +01:00 committed by David S. Miller
parent c0f4ace79e
commit 146c8a77d2
4 changed files with 22 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/net/xen-netback/common.h
View File

@ -153,7 +153,8 @@ struct xenvif {
u8 can_sg:1;
u8 gso:1;
u8 gso_prefix:1;
u8 csum:1;
u8 ip_csum:1;
u8 ipv6_csum:1;
/* Internal feature information. */
u8 can_queue:1; /* can queue packets for receiver? */

10
drivers/net/xen-netback/interface.c
View File

@ -216,8 +216,10 @@ static netdev_features_t xenvif_fix_features(struct net_device *dev,
features &= ~NETIF_F_SG;
if (!vif->gso && !vif->gso_prefix)
features &= ~NETIF_F_TSO;
if (!vif->csum)
if (!vif->ip_csum)
features &= ~NETIF_F_IP_CSUM;
if (!vif->ipv6_csum)
features &= ~NETIF_F_IPV6_CSUM;
return features;
}
@ -306,7 +308,7 @@ struct xenvif *xenvif_alloc(struct device *parent, domid_t domid,
vif->domid = domid;
vif->handle = handle;
vif->can_sg = 1;
vif->csum = 1;
vif->ip_csum = 1;
vif->dev = dev;
vif->credit_bytes = vif->remaining_credit = ~0UL;
@ -316,7 +318,9 @@ struct xenvif *xenvif_alloc(struct device *parent, domid_t domid,
vif->credit_timeout.expires = jiffies;
dev->netdev_ops = &xenvif_netdev_ops;
dev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_TSO;
dev->hw_features = NETIF_F_SG |
NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
NETIF_F_TSO;
dev->features = dev->hw_features;
SET_ETHTOOL_OPS(dev, &xenvif_ethtool_ops);

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

@ -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,

7
include/xen/interface/io/netif.h
View File

@ -50,6 +50,13 @@
* node as before.
*/
/*
* "feature-no-csum-offload" should be used to turn IPv4 TCP/UDP checksum
* offload off or on. If it is missing then the feature is assumed to be on.
* "feature-ipv6-csum-offload" should be used to turn IPv6 TCP/UDP checksum
* offload on or off. If it is missing then the feature is assumed to be off.
*/
/*
* This is the 'wire' format for packets:
* Request 1: xen_netif_tx_request -- XEN_NETTXF_* (any flags)