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Message-ID: <1381503982-1418-2-git-send-email-paul.durrant@citrix.com>
Date: Fri, 11 Oct 2013 16:06:18 +0100
From: Paul Durrant <paul.durrant@...rix.com>
To: <xen-devel@...ts.xen.org>, <netdev@...r.kernel.org>
CC: Paul Durrant <paul.durrant@...rix.com>,
Wei Liu <wei.liu2@...rix.com>,
David Vrabel <david.vrabel@...rix.com>,
Ian Campbell <ian.campbell@...rix.com>
Subject: [PATCH net-next v4 1/5] 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.
Also check analogous feature-ip-csum-offload to determine if a
guest is happy to accept IPv4 packets with only partial checksum
as a replacement for a negated feature-no-csum-offload value and
add a comment to deprecate use of feature-no-csum-offload.
Signed-off-by: Paul Durrant <paul.durrant@...rix.com>
Cc: Wei Liu <wei.liu2@...rix.com>
Cc: David Vrabel <david.vrabel@...rix.com>
Cc: Ian Campbell <ian.campbell@...rix.com>
---
drivers/net/xen-netback/common.h | 3 ++-
drivers/net/xen-netback/interface.c | 10 +++++++---
drivers/net/xen-netback/xenbus.c | 24 +++++++++++++++++++++++-
include/xen/interface/io/netif.h | 10 ++++++++++
4 files changed, 42 insertions(+), 5 deletions(-)
diff --git a/drivers/net/xen-netback/common.h b/drivers/net/xen-netback/common.h
index 5715318..b4a9a3c 100644
--- a/drivers/net/xen-netback/common.h
+++ b/drivers/net/xen-netback/common.h
@@ -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? */
diff --git a/drivers/net/xen-netback/interface.c b/drivers/net/xen-netback/interface.c
index 01bb854..8e92783 100644
--- a/drivers/net/xen-netback/interface.c
+++ b/drivers/net/xen-netback/interface.c
@@ -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);
diff --git a/drivers/net/xen-netback/xenbus.c b/drivers/net/xen-netback/xenbus.c
index 1b08d87..99343ca 100644
--- a/drivers/net/xen-netback/xenbus.c
+++ b/drivers/net/xen-netback/xenbus.c
@@ -571,10 +571,32 @@ static int connect_rings(struct backend_info *be)
val = 0;
vif->gso_prefix = !!val;
+ /* Before feature-ipv6-csum-offload was introduced, checksum offload
+ * was turned on by a zero value in (or lack of)
+ * feature-no-csum-offload. Therefore, for compatibility, assume
+ * that if feature-ip-csum-offload is missing that IP (v4) offload
+ * is turned on. If this is not the case then the flag will be
+ * cleared when we subsequently sample feature-no-csum-offload.
+ */
+ if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-ip-csum-offload",
+ "%d", &val) < 0)
+ val = 1;
+ vif->ip_csum = !!val;
+
+ if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-ipv6-csum-offload",
+ "%d", &val) < 0)
+ val = 0;
+ vif->ipv6_csum = !!val;
+
+ /* This is deprecated. Frontends should set IP v4 and v6 checksum
+ * offload using feature-ip-csum-offload and
+ * feature-ipv6-csum-offload respectively.
+ */
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-no-csum-offload",
"%d", &val) < 0)
val = 0;
- vif->csum = !val;
+ if (val)
+ vif->ip_csum = 0;
/* Map the shared frame, irq etc. */
err = xenvif_connect(vif, tx_ring_ref, rx_ring_ref,
diff --git a/include/xen/interface/io/netif.h b/include/xen/interface/io/netif.h
index eb262e3..d9fb44739 100644
--- a/include/xen/interface/io/netif.h
+++ b/include/xen/interface/io/netif.h
@@ -51,6 +51,16 @@
*/
/*
+ * "feature-no-csum-offload" was used to turn off IPv4 TCP/UDP checksum
+ * offload but is now deprecated. Two new feature flags should now be used
+ * to control checksum offload:
+ * "feature-ip-csum-offload" should be used to turn IPv4 TCP/UDP checksum
+ * offload on or off. 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)
* [Request 2: xen_netif_extra_info] (only if request 1 has XEN_NETTXF_extra_info)
--
1.7.10.4
--
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