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, 1 insertions, 1 deletions

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 52b0b956508b..aa29c6291353 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -3295,7 +3295,7 @@ int __init ip_rt_init(void)
         xfrm_init();
         xfrm4_init(ip_rt_max_size);
 #endif
-        rtnl_register(PF_INET, RTM_GETROUTE, inet_rtm_getroute, NULL);
+        rtnl_register(PF_INET, RTM_GETROUTE, inet_rtm_getroute, NULL, NULL);
 
 #ifdef CONFIG_SYSCTL
         register_pernet_subsys(&sysctl_route_ops);