path: root/include
diff options
authorTom Herbert <therbert@google.com>2014-10-14 22:19:06 (GMT)
committerDavid S. Miller <davem@davemloft.net>2014-10-15 16:11:00 (GMT)
commit04ffcb255f22a2a988ce7393e6e72f6eb3fcb7aa (patch)
treefd5367f3d55fad3b3b9b33a378b9cf4d1eb2298b /include
parent71ae8f5271b31da1172751059deb8bfc32b2b759 (diff)
net: Add ndo_gso_check
Add ndo_gso_check which a device can define to indicate whether is is capable of doing GSO on a packet. This funciton would be called from the stack to determine whether software GSO is needed to be done. A driver should populate this function if it advertises GSO types for which there are combinations that it wouldn't be able to handle. For instance a device that performs UDP tunneling might only implement support for transparent Ethernet bridging type of inner packets or might have limitations on lengths of inner headers. Signed-off-by: Tom Herbert <therbert@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
1 files changed, 11 insertions, 1 deletions
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 838407a..74fd5d3 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -998,6 +998,12 @@ typedef u16 (*select_queue_fallback_t)(struct net_device *dev,
* Callback to use for xmit over the accelerated station. This
* is used in place of ndo_start_xmit on accelerated net
* devices.
+ * bool (*ndo_gso_check) (struct sk_buff *skb,
+ * struct net_device *dev);
+ * Called by core transmit path to determine if device is capable of
+ * performing GSO on a packet. The device returns true if it is
+ * able to GSO the packet, false otherwise. If the return value is
+ * false the stack will do software GSO.
struct net_device_ops {
int (*ndo_init)(struct net_device *dev);
@@ -1147,6 +1153,8 @@ struct net_device_ops {
struct net_device *dev,
void *priv);
int (*ndo_get_lock_subclass)(struct net_device *dev);
+ bool (*ndo_gso_check) (struct sk_buff *skb,
+ struct net_device *dev);
@@ -3572,10 +3580,12 @@ static inline bool skb_gso_ok(struct sk_buff *skb, netdev_features_t features)
(!skb_has_frag_list(skb) || (features & NETIF_F_FRAGLIST));
-static inline bool netif_needs_gso(struct sk_buff *skb,
+static inline bool netif_needs_gso(struct net_device *dev, struct sk_buff *skb,
netdev_features_t features)
return skb_is_gso(skb) && (!skb_gso_ok(skb, features) ||
+ (dev->netdev_ops->ndo_gso_check &&
+ !dev->netdev_ops->ndo_gso_check(skb, dev)) ||
unlikely((skb->ip_summed != CHECKSUM_PARTIAL) &&
(skb->ip_summed != CHECKSUM_UNNECESSARY)));

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