netdevsim: Add extack error message for devlink reload

devlink reset command can fail if a FIB resource limit is set to a value
lower than the current occupancy. Return a proper message indicating the
reason for the failure.

$ devlink resource sh netdevsim/netdevsim0
netdevsim/netdevsim0:
  name IPv4 size unlimited unit entry size_min 0 size_max unlimited size_gran 1 dpipe_tables none
    resources:
      name fib size unlimited occ 43 unit entry size_min 0 size_max unlimited size_gran 1 dpipe_tables none
      name fib-rules size unlimited occ 4 unit entry size_min 0 size_max unlimited size_gran 1 dpipe_tables none
  name IPv6 size unlimited unit entry size_min 0 size_max unlimited size_gran 1 dpipe_tables none
    resources:
      name fib size unlimited occ 54 unit entry size_min 0 size_max unlimited size_gran 1 dpipe_tables none
      name fib-rules size unlimited occ 3 unit entry size_min 0 size_max unlimited size_gran 1 dpipe_tables none

$ devlink resource set netdevsim/netdevsim0 path /IPv4/fib size 40

$ devlink dev  reload netdevsim/netdevsim0
Error: netdevsim: New size is less than current occupancy.
devlink answers: Invalid argument

Signed-off-by: David Ahern <dsahern@gmail.com>
Acked-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/netdevsim/devlink.c b/drivers/net/netdevsim/devlink.c
index e8366cf..ba663e5 100644
--- a/drivers/net/netdevsim/devlink.c
+++ b/drivers/net/netdevsim/devlink.c
@@ -163,7 +163,7 @@ static int nsim_devlink_reload(struct devlink *devlink,
 
 		err = devlink_resource_size_get(devlink, res_ids[i], &val);
 		if (!err) {
-			err = nsim_fib_set_max(net, res_ids[i], val);
+			err = nsim_fib_set_max(net, res_ids[i], val, extack);
 			if (err)
 				return err;
 		}
@@ -181,7 +181,7 @@ static void nsim_devlink_net_reset(struct net *net)
 	int i;
 
 	for (i = 0; i < ARRAY_SIZE(res_ids); ++i) {
-		if (nsim_fib_set_max(net, res_ids[i], (u64)-1)) {
+		if (nsim_fib_set_max(net, res_ids[i], (u64)-1, NULL)) {
 			pr_err("Failed to reset limit for resource %u\n",
 			       res_ids[i]);
 		}