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>
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@ -153,7 +153,8 @@ struct xenvif {
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u8 can_sg:1;
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u8 can_sg:1;
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u8 gso:1;
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u8 gso:1;
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u8 gso_prefix:1;
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u8 gso_prefix:1;
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u8 csum:1;
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u8 ip_csum:1;
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u8 ipv6_csum:1;
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/* Internal feature information. */
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/* Internal feature information. */
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u8 can_queue:1; /* can queue packets for receiver? */
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u8 can_queue:1; /* can queue packets for receiver? */
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@ -216,8 +216,10 @@ static netdev_features_t xenvif_fix_features(struct net_device *dev,
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features &= ~NETIF_F_SG;
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features &= ~NETIF_F_SG;
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if (!vif->gso && !vif->gso_prefix)
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if (!vif->gso && !vif->gso_prefix)
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features &= ~NETIF_F_TSO;
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features &= ~NETIF_F_TSO;
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if (!vif->csum)
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if (!vif->ip_csum)
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features &= ~NETIF_F_IP_CSUM;
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features &= ~NETIF_F_IP_CSUM;
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if (!vif->ipv6_csum)
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features &= ~NETIF_F_IPV6_CSUM;
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return features;
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return features;
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}
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}
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@ -306,7 +308,7 @@ struct xenvif *xenvif_alloc(struct device *parent, domid_t domid,
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vif->domid = domid;
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vif->domid = domid;
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vif->handle = handle;
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vif->handle = handle;
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vif->can_sg = 1;
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vif->can_sg = 1;
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vif->csum = 1;
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vif->ip_csum = 1;
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vif->dev = dev;
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vif->dev = dev;
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vif->credit_bytes = vif->remaining_credit = ~0UL;
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vif->credit_bytes = vif->remaining_credit = ~0UL;
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@ -316,7 +318,9 @@ struct xenvif *xenvif_alloc(struct device *parent, domid_t domid,
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vif->credit_timeout.expires = jiffies;
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vif->credit_timeout.expires = jiffies;
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dev->netdev_ops = &xenvif_netdev_ops;
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dev->netdev_ops = &xenvif_netdev_ops;
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dev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_TSO;
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dev->hw_features = NETIF_F_SG |
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NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
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NETIF_F_TSO;
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dev->features = dev->hw_features;
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dev->features = dev->hw_features;
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SET_ETHTOOL_OPS(dev, &xenvif_ethtool_ops);
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SET_ETHTOOL_OPS(dev, &xenvif_ethtool_ops);
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@ -574,7 +574,12 @@ static int connect_rings(struct backend_info *be)
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if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-no-csum-offload",
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if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-no-csum-offload",
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"%d", &val) < 0)
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"%d", &val) < 0)
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val = 0;
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val = 0;
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vif->csum = !val;
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vif->ip_csum = !val;
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if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-ipv6-csum-offload",
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"%d", &val) < 0)
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val = 0;
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vif->ipv6_csum = !!val;
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/* Map the shared frame, irq etc. */
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/* Map the shared frame, irq etc. */
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err = xenvif_connect(vif, tx_ring_ref, rx_ring_ref,
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err = xenvif_connect(vif, tx_ring_ref, rx_ring_ref,
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@ -50,6 +50,13 @@
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* node as before.
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* node as before.
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*/
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*/
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/*
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* "feature-no-csum-offload" should be used to turn IPv4 TCP/UDP checksum
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* offload off or on. If it is missing then the feature is assumed to be on.
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* "feature-ipv6-csum-offload" should be used to turn IPv6 TCP/UDP checksum
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* offload on or off. If it is missing then the feature is assumed to be off.
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*/
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/*
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/*
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* This is the 'wire' format for packets:
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* This is the 'wire' format for packets:
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* Request 1: xen_netif_tx_request -- XEN_NETTXF_* (any flags)
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* Request 1: xen_netif_tx_request -- XEN_NETTXF_* (any flags)
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