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Commit 146c8a77 authored by Paul Durrant's avatar Paul Durrant Committed by David S. Miller
Browse files

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: default avatarPaul 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: default avatarDavid S. Miller <davem@davemloft.net>
parent c0f4ace7

drivers/net/xen-netback/common.h

+2 −1
Original line number Diff line number Diff line
@@ -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? */

drivers/net/xen-netback/interface.c

+7 −3
Original line number Diff line number Diff line
@@ -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);

drivers/net/xen-netback/xenbus.c

+6 −1
Original line number Diff line number Diff line
@@ -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,

include/xen/interface/io/netif.h

+7 −0
Original line number Diff line number Diff line
@@ -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)