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, 10 insertions, 5 deletions

diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index ffb0dc4cc0e8..6814083a92f4 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -218,19 +218,24 @@ int __init br_netlink_init(void)
         if (err < 0)
                 goto err1;
 
-        err = __rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, br_dump_ifinfo);
+        err = __rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL,
+                              br_dump_ifinfo, NULL);
         if (err)
                 goto err2;
-        err = __rtnl_register(PF_BRIDGE, RTM_SETLINK, br_rtm_setlink, NULL);
+        err = __rtnl_register(PF_BRIDGE, RTM_SETLINK,
+                              br_rtm_setlink, NULL, NULL);
         if (err)
                 goto err3;
-        err = __rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, br_fdb_add, NULL);
+        err = __rtnl_register(PF_BRIDGE, RTM_NEWNEIGH,
+                              br_fdb_add, NULL, NULL);
         if (err)
                 goto err3;
-        err = __rtnl_register(PF_BRIDGE, RTM_DELNEIGH, br_fdb_delete, NULL);
+        err = __rtnl_register(PF_BRIDGE, RTM_DELNEIGH,
+                              br_fdb_delete, NULL, NULL);
         if (err)
                 goto err3;
-        err = __rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, br_fdb_dump);
+        err = __rtnl_register(PF_BRIDGE, RTM_GETNEIGH,
+                              NULL, br_fdb_dump, NULL);
         if (err)
                 goto err3;