[PATCH] link: Support RTEXT_FILTER_VF

[Jef Oliver]

Extend rtnl_link_build_get_request() and link_request_update()
to provide IFLA_EXT_MASK with RTEXT_FILTER_VF.

Define RTEXT_FILTER_VF

This enables rtnl_link_get_num_vf to properly return the number
of VFs defined for a link.

Signed-off-by: Jef Oliver <jef.oliver at intel.com>
---
 include/linux-private/linux/rtnetlink.h |  3 +++
 lib/route/link.c                        | 26 ++++++++++++++++++++++++--
 2 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/include/linux-private/linux/rtnetlink.h b/include/linux-private/linux/rtnetlink.h
index 2363c18..1e0425e 100644
--- a/include/linux-private/linux/rtnetlink.h
+++ b/include/linux-private/linux/rtnetlink.h
@@ -600,6 +600,9 @@ struct tcamsg {
 #define TCA_ACT_TAB 1 /* attr type must be >=1 */	
 #define TCAA_MAX 1
 
+/* Extended info filters for IFLA_EXT_MASK */
+#define RTEXT_FILTER_VF		(1 << 0)
+
 /* End of information exported to user level */
 
 #endif	/* __LINUX_RTNETLINK_H */
diff --git a/lib/route/link.c b/lib/route/link.c
index 0b3238f..6cce85e 100644
--- a/lib/route/link.c
+++ b/lib/route/link.c
@@ -640,9 +640,29 @@ errout:
 
 static int link_request_update(struct nl_cache *cache, struct nl_sock *sk)
 {
-	int family = cache->c_iarg1;
+	struct ifinfomsg ifi;
+	struct nl_msg *msg;
+	int err = 0;
+
+	memset(&ifi, 0, sizeof(ifi));
+
+	if (!(msg = nlmsg_alloc_simple(RTM_GETLINK, NLM_F_DUMP)))
+		return -NLE_NOMEM;
+
+	ifi.ifi_family = cache->c_iarg1;
+
+	if (nlmsg_append(msg, &ifi, sizeof(ifi), NLMSG_ALIGNTO < 0)) {
+		err = -NLE_MSGSIZE;
+		goto nla_put_failure;
+	}
+
+	NLA_PUT_U32(msg, IFLA_EXT_MASK, RTEXT_FILTER_VF);
+
+	nl_send_auto(sk, msg);
 
-	return nl_rtgen_request(sk, RTM_GETLINK, family, NLM_F_DUMP);
+nla_put_failure:
+	nlmsg_free(msg);
+	return err;
 }
 
 static void link_dump_line(struct nl_object *obj, struct nl_dump_params *p)
@@ -1139,6 +1159,8 @@ int rtnl_link_build_get_request(int ifindex, const char *name,
 	if (name)
 		NLA_PUT_STRING(msg, IFLA_IFNAME, name);
 
+        NLA_PUT_U32(msg, IFLA_EXT_MASK, RTEXT_FILTER_VF);
+
 	*result = msg;
 	return 0;
 
-- 
2.8.2