netdev - [PATCH net-next 1/2] mlxsw: spectrum_router: Return an error for non-default FIB rules

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Date:   Tue,  1 May 2018 11:16:38 +0300
From:   Ido Schimmel <idosch@...lanox.com>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, jiri@...lanox.com, dsahern@...il.com,
        mlxsw@...lanox.com, Ido Schimmel <idosch@...lanox.com>
Subject: [PATCH net-next 1/2] mlxsw: spectrum_router: Return an error for non-default FIB rules

Since commit 9776d32537d2 ("net: Move call_fib_rule_notifiers up in
fib_nl_newrule") it is possible to forbid the installation of
unsupported FIB rules.

Have mlxsw return an error for non-default FIB rules in addition to the
existing extack message.

Example:
# ip rule add from 198.51.100.1 table 10
Error: mlxsw_spectrum: FIB rules not supported.

Note that offload is only aborted when non-default FIB rules are already
installed and merely replayed during module initialization.

Signed-off-by: Ido Schimmel <idosch@...lanox.com>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index 8e4edb634b11..baea97560029 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -5899,7 +5899,7 @@ static int mlxsw_sp_router_fib_rule_event(unsigned long event,
 	}
 
 	if (err < 0)
-		NL_SET_ERR_MSG_MOD(extack, "FIB rules not supported. Aborting offload");
+		NL_SET_ERR_MSG_MOD(extack, "FIB rules not supported");
 
 	return err;
 }
@@ -5926,8 +5926,8 @@ static int mlxsw_sp_router_fib_event(struct notifier_block *nb,
 	case FIB_EVENT_RULE_DEL:
 		err = mlxsw_sp_router_fib_rule_event(event, info,
 						     router->mlxsw_sp);
-		if (!err)
-			return NOTIFY_DONE;
+		if (!err || info->extack)
+			return notifier_from_errno(err);
 	}
 
 	fib_work = kzalloc(sizeof(*fib_work), GFP_ATOMIC);
-- 
2.14.3