X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=datapath%2Fcompat.h;h=71fa06c1b7b183019967f2c374bd97029937e0e8;hb=9b80f761bed9a32c1b0eb22ee3361966057ea973;hp=c484a5d72a6c991586916c6b64bef70b9cb6b869;hpb=9cb8d24da006b562fecd17d34971822e3f6d1a78;p=sliver-openvswitch.git

diff --git a/datapath/compat.h b/datapath/compat.h
index c484a5d72..71fa06c1b 100644
--- a/datapath/compat.h
+++ b/datapath/compat.h
@@ -1,9 +1,19 @@
 /*
- * Copyright (c) 2011 Nicira Networks.
- * Distributed under the terms of the GNU GPL version 2.
+ * Copyright (c) 2007-2012 Nicira Networks.
  *
- * Significant portions of this file may be copied from parts of the Linux
- * kernel, by Linus Torvalds and others.
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
  */
 
 #ifndef COMPAT_H
@@ -36,4 +46,39 @@ static inline int CHECK_NUL_STRING(struct nlattr *attr, int maxlen)
 }
 #endif  /* !HAVE_NLA_NUL_STRING */
 
+static inline void skb_clear_rxhash(struct sk_buff *skb)
+{
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35)
+	skb->rxhash = 0;
+#endif
+}
+
+/*
+ * Enforces, mutual exclusion with the Linux bridge module, by declaring and
+ * exporting br_should_route_hook.  Because the bridge module also exports the
+ * same symbol, the module loader will refuse to load both modules at the same
+ * time (e.g. "bridge: exports duplicate symbol br_should_route_hook (owned by
+ * openvswitch)").
+ *
+ * Before Linux 2.6.36, Open vSwitch cannot safely coexist with the Linux
+ * bridge module, so openvswitch uses this macro in those versions.  In
+ * Linux 2.6.36 and later, Open vSwitch can coexist with the bridge module,
+ * but it makes no sense to load both bridge and brcompat, so brcompat uses
+ * this macro in those versions.
+ *
+ * The use of "typeof" here avoids the need to track changes in the type of
+ * br_should_route_hook over various kernel versions.
+ */
+#define BRIDGE_MUTUAL_EXCLUSION					\
+	typeof(br_should_route_hook) br_should_route_hook;	\
+	EXPORT_SYMBOL(br_should_route_hook)
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,32)
+#define GENL_SOCK(net) (genl_sock)
+#define SET_NETNSOK
+#else
+#define GENL_SOCK(net) ((net)->genl_sock)
+#define SET_NETNSOK    .netnsok = true,
+#endif
+
 #endif /* compat.h */