Commit 12b0004d authored by Cong Wang's avatar Cong Wang Committed by David S. Miller

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: default avatarCong Wang <amwang@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 25060d8f
...@@ -2662,8 +2662,15 @@ extern int netdev_master_upper_dev_link(struct net_device *dev, ...@@ -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, extern void netdev_upper_dev_unlink(struct net_device *dev,
struct net_device *upper_dev); struct net_device *upper_dev);
extern int skb_checksum_help(struct sk_buff *skb); extern int skb_checksum_help(struct sk_buff *skb);
extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, extern struct sk_buff *__skb_gso_segment(struct sk_buff *skb,
netdev_features_t features); 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 #ifdef CONFIG_BUG
extern void netdev_rx_csum_fault(struct net_device *dev); extern void netdev_rx_csum_fault(struct net_device *dev);
#else #else
......
...@@ -2327,18 +2327,29 @@ int skb_checksum_help(struct sk_buff *skb) ...@@ -2327,18 +2327,29 @@ int skb_checksum_help(struct sk_buff *skb)
} }
EXPORT_SYMBOL(skb_checksum_help); 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 * @skb: buffer to segment
* @features: features for the output path (see dev->features) * @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. * This function segments the given skb and returns a list of segments.
* *
* It may return NULL if the skb requires no segmentation. This is * It may return NULL if the skb requires no segmentation. This is
* only possible when GSO is used for verifying header integrity. * only possible when GSO is used for verifying header integrity.
*/ */
struct sk_buff *skb_gso_segment(struct sk_buff *skb, struct sk_buff *__skb_gso_segment(struct sk_buff *skb,
netdev_features_t features) netdev_features_t features, bool tx_path)
{ {
struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT); struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
struct packet_offload *ptype; struct packet_offload *ptype;
...@@ -2361,7 +2372,7 @@ struct sk_buff *skb_gso_segment(struct sk_buff *skb, ...@@ -2361,7 +2372,7 @@ struct sk_buff *skb_gso_segment(struct sk_buff *skb,
skb->mac_len = skb->network_header - skb->mac_header; skb->mac_len = skb->network_header - skb->mac_header;
__skb_pull(skb, skb->mac_len); __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); skb_warn_bad_offload(skb);
if (skb_header_cloned(skb) && if (skb_header_cloned(skb) &&
...@@ -2390,7 +2401,7 @@ struct sk_buff *skb_gso_segment(struct sk_buff *skb, ...@@ -2390,7 +2401,7 @@ struct sk_buff *skb_gso_segment(struct sk_buff *skb,
return segs; return segs;
} }
EXPORT_SYMBOL(skb_gso_segment); EXPORT_SYMBOL(__skb_gso_segment);
/* Take action when hardware reception checksum errors are detected. */ /* Take action when hardware reception checksum errors are detected. */
#ifdef CONFIG_BUG #ifdef CONFIG_BUG
......
...@@ -301,7 +301,7 @@ static int queue_gso_packets(struct net *net, int dp_ifindex, ...@@ -301,7 +301,7 @@ static int queue_gso_packets(struct net *net, int dp_ifindex,
struct sk_buff *segs, *nskb; struct sk_buff *segs, *nskb;
int err; 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)) if (IS_ERR(segs))
return PTR_ERR(segs); return PTR_ERR(segs);
......
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