[PATCH net v2] net: marvell: prestera: fix brige port operation

From: Volodymyr Mytnyk <redacted>

Return NOTIFY_DONE (dont't care) for switchdev notifications
that prestera driver don't know how to handle them.

With introduction of SWITCHDEV_BRPORT_[UN]OFFLOADED switchdev
events, the driver rejects adding swport to bridge operation
which is handled by prestera_bridge_port_join() func. The root
cause of this is that prestera driver returns error (EOPNOTSUPP)
in prestera_switchdev_blk_event() handler for unknown swdev
events. This causes switchdev_bridge_port_offload() to fail
when adding port to bridge in prestera_bridge_port_join().

Fixes: 957e2235e526 ("net: make switchdev_bridge_port_{,unoffload} loosely coupled with the bridge")
Signed-off-by: Volodymyr Mytnyk <redacted>
---

Changes in V2:
 - Split changes into two independent commits:
   - fix prestera_switchdev_blk_event() handler (THIS PATCH)
   - fix error path handling in prestera_bridge_port_join() (NEW)
 - Updated fix tags in both patches according to review comments
 - Fix commit messages in both patches

 drivers/net/ethernet/marvell/prestera/prestera_switchdev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/marvell/prestera/prestera_switchdev.c b/drivers/net/ethernet/marvell/prestera/prestera_switchdev.c
index 3ce6ccd0f539..79f2fca0d412 100644
--- a/drivers/net/ethernet/marvell/prestera/prestera_switchdev.c
+++ b/drivers/net/ethernet/marvell/prestera/prestera_switchdev.c

@@ -1124,7 +1124,7 @@ static int prestera_switchdev_blk_event(struct notifier_block *unused,
 						     prestera_port_obj_attr_set);
 		break;
 	default:
-		err = -EOPNOTSUPP;
+		return NOTIFY_DONE;
 	}
 
 	return notifier_from_errno(err);

-- 
2.7.4

Hello:

This patch was applied to netdev/net.git (master)
by David S. Miller [off-list ref]:

On Thu, 18 Nov 2021 21:48:03 +0200 you wrote:

From: Volodymyr Mytnyk <redacted>

Return NOTIFY_DONE (dont't care) for switchdev notifications
that prestera driver don't know how to handle them.

With introduction of SWITCHDEV_BRPORT_[UN]OFFLOADED switchdev
events, the driver rejects adding swport to bridge operation
which is handled by prestera_bridge_port_join() func. The root
cause of this is that prestera driver returns error (EOPNOTSUPP)
in prestera_switchdev_blk_event() handler for unknown swdev
events. This causes switchdev_bridge_port_offload() to fail
when adding port to bridge in prestera_bridge_port_join().

[...]

Here is the summary with links:
  - [net,v2] net: marvell: prestera: fix brige port operation
    https://git.kernel.org/netdev/net/c/253e9b4d11e5

You are awesome, thank you!
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