netdev - [PATCH AUTOSEL 5.15 181/188] net/mlx5e: Unblock setting vid 0 for VF in case PF isn't eswitch manager

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Date:   Mon, 17 Jan 2022 21:31:45 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Maor Dickman <maord@...dia.com>, Roi Dayan <roid@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        Sasha Levin <sashal@...nel.org>, davem@...emloft.net,
        kuba@...nel.org, parav@...dia.com, dlinkin@...dia.com,
        mbloch@...dia.com, huyn@...dia.com, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org
Subject: [PATCH AUTOSEL 5.15 181/188] net/mlx5e: Unblock setting vid 0 for VF in case PF isn't eswitch manager

From: Maor Dickman <maord@...dia.com>

[ Upstream commit 7846665d3504812acaebf920d1141851379a7f37 ]

When using libvirt to passthrough VF to VM it will always set the VF vlan
to 0 even if user didn’t request it, this will cause libvirt to fail to
boot in case the PF isn't eswitch owner.

Example of such case is the DPU host PF which isn't eswitch manager, so
any attempt to passthrough VF of it using libvirt will fail.

Fix it by not returning error in case set VF vlan is called with vid 0.

Signed-off-by: Maor Dickman <maord@...dia.com>
Reviewed-by: Roi Dayan <roid@...dia.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/mellanox/mlx5/core/esw/legacy.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/esw/legacy.c b/drivers/net/ethernet/mellanox/mlx5/core/esw/legacy.c
index df277a6cddc0b..0c4c743ca31e1 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/esw/legacy.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/esw/legacy.c
@@ -431,7 +431,7 @@ int mlx5_eswitch_set_vport_vlan(struct mlx5_eswitch *esw,
 	int err = 0;
 
 	if (!mlx5_esw_allowed(esw))
-		return -EPERM;
+		return vlan ? -EPERM : 0;
 
 	if (vlan || qos)
 		set_flags = SET_VLAN_STRIP | SET_VLAN_INSERT;
-- 
2.34.1