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net: adjust skb_gso_segment() for calling in rx path 

skb_gso_segment() is almost always called in tx path,
except for openvswitch. It calls this function when
it receives the packet and tries to queue it to user-space.
In this special case, the ->ip_summed check inside
skb_gso_segment() is no longer true, as ->ip_summed value
has different meanings on rx path.

This patch adjusts skb_gso_segment() so that we can at least
avoid such warnings on checksum.

Cc: Jesse Gross <jesse@nicira.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Cong Wang <amwang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Cong Wang 2013-02-05 16:36:38 +00:00 committed by David S. Miller
parent 25060d8f3f
commit 12b0004d1d
3 changed files with 26 additions and 8 deletions
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11
include/linux/netdevice.h
View File

@ -2662,8 +2662,15 @@ extern int netdev_master_upper_dev_link(struct net_device *dev,
extern void netdev_upper_dev_unlink(struct net_device *dev,
struct net_device *upper_dev);
extern int skb_checksum_help(struct sk_buff *skb);
extern struct sk_buff *skb_gso_segment(struct sk_buff *skb,
netdev_features_t features);
extern struct sk_buff *__skb_gso_segment(struct sk_buff *skb,
netdev_features_t features, bool tx_path);
static inline
struct sk_buff *skb_gso_segment(struct sk_buff *skb, netdev_features_t features)
{
return __skb_gso_segment(skb, features, true);
}
#ifdef CONFIG_BUG
extern void netdev_rx_csum_fault(struct net_device *dev);
#else

21
net/core/dev.c
View File

@ -2327,18 +2327,29 @@ out:
}
EXPORT_SYMBOL(skb_checksum_help);
/* openvswitch calls this on rx path, so we need a different check.
*/
static inline bool skb_needs_check(struct sk_buff *skb, bool tx_path)
{
if (tx_path)
return skb->ip_summed != CHECKSUM_PARTIAL;
else
return skb->ip_summed == CHECKSUM_NONE;
}
/**
* skb_gso_segment - Perform segmentation on skb.
* __skb_gso_segment - Perform segmentation on skb.
* @skb: buffer to segment
* @features: features for the output path (see dev->features)
* @tx_path: whether it is called in TX path
*
* This function segments the given skb and returns a list of segments.
*
* It may return NULL if the skb requires no segmentation. This is
* only possible when GSO is used for verifying header integrity.
*/
struct sk_buff *skb_gso_segment(struct sk_buff *skb,
netdev_features_t features)
struct sk_buff *__skb_gso_segment(struct sk_buff *skb,
netdev_features_t features, bool tx_path)
{
struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
struct packet_offload *ptype;
@ -2361,7 +2372,7 @@ struct sk_buff *skb_gso_segment(struct sk_buff *skb,
skb->mac_len = skb->network_header - skb->mac_header;
__skb_pull(skb, skb->mac_len);
if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
if (unlikely(skb_needs_check(skb, tx_path))) {
skb_warn_bad_offload(skb);
if (skb_header_cloned(skb) &&
@ -2390,7 +2401,7 @@ struct sk_buff *skb_gso_segment(struct sk_buff *skb,
return segs;
}
EXPORT_SYMBOL(skb_gso_segment);
EXPORT_SYMBOL(__skb_gso_segment);
/* Take action when hardware reception checksum errors are detected. */
#ifdef CONFIG_BUG

2
net/openvswitch/datapath.c
View File

@ -301,7 +301,7 @@ static int queue_gso_packets(struct net *net, int dp_ifindex,
struct sk_buff *segs, *nskb;
int err;
segs = skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM);
segs = __skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM, false);
if (IS_ERR(segs))
return PTR_ERR(segs);