net: Add extack argument to ndo_fdb_add()

Drivers may not be able to support certain FDB entries, and an error
code is insufficient to give clear hints as to the reasons of rejection.

In order to make it possible to communicate the rejection reason, extend
ndo_fdb_add() with an extack argument. Adapt the existing
implementations of ndo_fdb_add() to take the parameter (and ignore it).
Pass the extack parameter when invoking ndo_fdb_add() from rtnl_fdb_add().

Signed-off-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 2 deletions

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 1377d085ef99..a57b9a853aab 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1152,7 +1152,8 @@ struct dev_ifalias {
  *
  * int (*ndo_fdb_add)(struct ndmsg *ndm, struct nlattr *tb[],
  *                    struct net_device *dev,
- *                    const unsigned char *addr, u16 vid, u16 flags)
+ *                    const unsigned char *addr, u16 vid, u16 flags,
+ *                    struct netlink_ext_ack *extack);
  *      Adds an FDB entry to dev for addr.
  * int (*ndo_fdb_del)(struct ndmsg *ndm, struct nlattr *tb[],
  *                    struct net_device *dev,
@@ -1376,7 +1377,8 @@ struct net_device_ops {
                                                struct net_device *dev,
                                                const unsigned char *addr,
                                                u16 vid,
-                                               u16 flags);
+                                               u16 flags,
+                                               struct netlink_ext_ack *extack);
         int                     (*ndo_fdb_del)(struct ndmsg *ndm,
                                                struct nlattr *tb[],
                                                struct net_device *dev,