netdev-linux: Avoid depending on kernel definition of rtnl_link_stats64.

We have to define our own with some kernel headers, so we might as well do
it everywhere, especially since there seems to be a problem with detecting
the presence of the definition with at least some kernels.

Reported-by: Wang Sheng-Hui <[email protected]>
Signed-off-by: Ben Pfaff <[email protected]>
Acked-by: Joe Stringer <[email protected]>

configure.ac

@@ -67,8 +67,6 @@ AC_CHECK_DECLS([sys_siglist], [], [], [[#include <signal.h>]])
 AC_CHECK_MEMBERS([struct stat.st_mtim.tv_nsec, struct stat.st_mtimensec],
   [], [], [[#include <sys/stat.h>]])
 AC_CHECK_MEMBERS([struct ifreq.ifr_flagshigh], [], [], [[#include <net/if.h>]])
-AC_CHECK_TYPES([struct rtnl_link_stats64], [], [],
-  [[#include <linux/if_link.h>]])
 AC_CHECK_FUNCS([mlockall strnlen getloadavg statvfs getmntent_r])
 AC_CHECK_HEADERS([mntent.h sys/statvfs.h linux/types.h linux/if_ether.h stdatomic.h])
 AC_CHECK_HEADERS([net/if_mib.h], [], [], [[#include <sys/types.h>

lib/netdev-linux.c

@@ -138,9 +138,17 @@ struct tpacket_auxdata {
     uint16_t tp_vlan_tpid;
 };
 
-/* Linux 2.6.35 introduced IFLA_STATS64 and rtnl_link_stats64. */
-#ifndef HAVE_STRUCT_RTNL_LINK_STATS64
+/* Linux 2.6.35 introduced IFLA_STATS64 and rtnl_link_stats64.
+ *
+ * Tests for rtnl_link_stats64 don't seem to consistently work, e.g. on
+ * 2.6.32-431.29.2.el6.x86_64 (see report at
+ * http://openvswitch.org/pipermail/dev/2014-October/047978.html).  Maybe
+ * if_link.h is not self-contained on those kernels.  It is easiest to
+ * unconditionally define a replacement. */
+#ifndef IFLA_STATS64
 #define IFLA_STATS64 23
+#endif
+#define rtnl_link_stats64 rpl_rtnl_link_stats64
 struct rtnl_link_stats64 {
     uint64_t rx_packets;
     uint64_t tx_packets;
@@ -169,7 +177,6 @@ struct rtnl_link_stats64 {
     uint64_t rx_compressed;
     uint64_t tx_compressed;
 };
-#endif  /* !HAVE_STRUCT_RTNL_LINK_STATS64 */
 
 enum {
     VALID_IFINDEX           = 1 << 0,