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net: Add ndo_gso_check

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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>
This commit is contained in:
Tom Herbert 2014-10-14 15:19:06 -07:00 committed by David S. Miller
parent 71ae8f5271
commit 04ffcb255f
4 changed files with 14 additions and 4 deletions
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2
drivers/net/macvtap.c
View file

@ -298,7 +298,7 @@ static rx_handler_result_t macvtap_handle_frame(struct sk_buff **pskb)
*/
if (q->flags & IFF_VNET_HDR)
features |= vlan->tap_features;
if (netif_needs_gso(skb, features)) {
if (netif_needs_gso(dev, skb, features)) {
struct sk_buff *segs = __skb_gso_segment(skb, features, false);
if (IS_ERR(segs))

2
drivers/net/xen-netfront.c
View file

@ -638,7 +638,7 @@ static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev)
if (unlikely(!netif_carrier_ok(dev) ||
(slots > 1 && !xennet_can_sg(dev)) ||
netif_needs_gso(skb, netif_skb_features(skb)))) {
netif_needs_gso(dev, skb, netif_skb_features(skb)))) {
spin_unlock_irqrestore(&queue->tx_lock, flags);
goto drop;
}

12
include/linux/netdevice.h
View file

@ -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)));
}

2
net/core/dev.c
View file

@ -2675,7 +2675,7 @@ static struct sk_buff *validate_xmit_skb(struct sk_buff *skb, struct net_device
if (skb->encapsulation)
features &= dev->hw_enc_features;
if (netif_needs_gso(skb, features)) {
if (netif_needs_gso(dev, skb, features)) {
struct sk_buff *segs;
segs = skb_gso_segment(skb, features);