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, 6 deletions

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 3e369425df58..05838c7fcf64 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -4727,16 +4727,20 @@ int __init addrconf_init(void)
         if (err < 0)
                 goto errout_af;
 
-        err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
+        err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
+                              NULL);
         if (err < 0)
                 goto errout;
 
         /* Only the first call to __rtnl_register can fail */
-        __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
-        __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
-        __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
-        __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
-        __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
+        __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
+        __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
+        __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
+                        inet6_dump_ifaddr, NULL);
+        __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
+                        inet6_dump_ifmcaddr, NULL);
+        __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
+                        inet6_dump_ifacaddr, NULL);
 
         ipv6_addr_label_rtnl_register();