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>

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 85b0949..ab2774e 100644 (file)
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -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

diff --git a/net/core/dev.c b/net/core/dev.c
index 2b275a7..65da698 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -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

diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
index d8c13a9..9dc537d 100644 (file)
--- a/net/openvswitch/datapath.c
+++ b/net/openvswitch/datapath.c
@@ -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);