rtnetlink: Compute and store minimum ifinfo dump size

The message size allocated for rtnl ifinfo dumps was limited to
a single page.  This is not enough for additional interface info
available with devices that support SR-IOV and caused a bug in
which VF info would not be displayed if more than approximately
40 VFs were created per interface.

Implement a new function pointer for the rtnl_register service that will
calculate the amount of data required for the ifinfo dump and allocate
enough data to satisfy the request.

Signed-off-by: Greg Rose <gregory.v.rose@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index 22524716fe70..92fc5f69f5da 100644
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -1124,9 +1124,9 @@ static struct pernet_operations fib_net_ops = {
 
 void __init ip_fib_init(void)
 {
-        rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL);
-        rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL);
-        rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib);
+        rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL, NULL);
+        rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL, NULL);
+        rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib, NULL);
 
         register_pernet_subsys(&fib_net_ops);
         register_netdevice_notifier(&fib_netdev_notifier);