datapath: backport kfree_skb_list()

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Acked-by: Jesse Gross <jesse@nicira.com>

Author: Pravin B Shelar

acinclude.m4

@@ -344,6 +344,7 @@ AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
   # quoting rules.
   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [[[^@]]proto_data_valid],
                   [OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
+  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [kfree_skb_list])
   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [rxhash])
   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [u16.*rxhash],
                   [OVS_DEFINE([HAVE_U16_RXHASH])])

datapath/linux/compat/include/linux/skbuff.h

@@ -368,4 +368,8 @@ int rpl_skb_vlan_pop(struct sk_buff *skb);
 int rpl_skb_vlan_push(struct sk_buff *skb, __be16 vlan_proto, u16 vlan_tci);
 #endif
 
+#ifndef HAVE_KFREE_SKB_LIST
+void rpl_kfree_skb_list(struct sk_buff *segs);
+#define kfree_skb_list rpl_kfree_skb_list
+#endif
 #endif

datapath/linux/compat/skbuff-openvswitch.c

@@ -267,3 +267,16 @@ int rpl_pskb_expand_head(struct sk_buff *skb, int nhead, int ntail,
 EXPORT_SYMBOL(rpl_pskb_expand_head);
 
 #endif
+
+#ifndef HAVE_KFREE_SKB_LIST
+void rpl_kfree_skb_list(struct sk_buff *segs)
+{
+	while (segs) {
+		struct sk_buff *next = segs->next;
+
+		kfree_skb(segs);
+		segs = next;
+	}
+}
+EXPORT_SYMBOL(rpl_kfree_skb_list);
+#endif