datapath: Support for Linux kernel 3.9.

[sliver-openvswitch.git] / datapath / linux / compat / gso.c

diff --git a/datapath/linux/compat/gso.c b/datapath/linux/compat/gso.c
index 43418d3..30332a2 100644 (file)
--- a/datapath/linux/compat/gso.c
+++ b/datapath/linux/compat/gso.c
@@ -65,6 +65,7 @@ static struct sk_buff *tnl_skb_gso_segment(struct sk_buff *skb,
        struct sk_buff *skb1 = skb;
        struct sk_buff *segs;
        __be16 proto = skb->protocol;
+       char cb[sizeof(skb->cb)];
 
        /* setup whole inner packet to get protocol. */
        __skb_pull(skb, mac_offset);
@@ -76,6 +77,10 @@ static struct sk_buff *tnl_skb_gso_segment(struct sk_buff *skb,
        skb_reset_network_header(skb);
        skb_reset_transport_header(skb);
 
+       /* From 3.9 kernel skb->cb is used by skb gso. Therefore
+        * make copy of it to restore it back. */
+       memcpy(cb, skb->cb, sizeof(cb));
+
        segs = __skb_gso_segment(skb, 0, tx_path);
        if (!segs || IS_ERR(segs))
                goto free;
@@ -89,6 +94,7 @@ static struct sk_buff *tnl_skb_gso_segment(struct sk_buff *skb,
                skb->mac_len = 0;
 
                memcpy(ip_hdr(skb), iph, pkt_hlen);
+               memcpy(skb->cb, cb, sizeof(cb));
                if (OVS_GSO_CB(skb)->fix_segment)
                        OVS_GSO_CB(skb)->fix_segment(skb);