[PATCH 5.1 92/98] mlxsw: spectrum: Prevent force of 56G

[Greg Kroah-Hartman]

[ Upstream commit 275e928f19117d22f6d26dee94548baf4041b773 ]

Force of 56G is not supported by hardware in Ethernet devices. This
configuration fails with a bad parameter error from firmware.

Add check of this case. Instead of trying to set 56G with autoneg off,
return a meaningful error.

Fixes: 56ade8fe3fe1 ("mlxsw: spectrum: Add initial support for Spectrum ASIC")
Signed-off-by: Amit Cohen <am...@mellanox.com>
Acked-by: Jiri Pirko <j...@mellanox.com>
Signed-off-by: Ido Schimmel <ido...@mellanox.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c 
b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
index 6b8aa3761899..f4acb38569e1 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
@@ -3110,6 +3110,10 @@ mlxsw_sp_port_set_link_ksettings(struct net_device *dev,
        ops->reg_ptys_eth_unpack(mlxsw_sp, ptys_pl, &eth_proto_cap, NULL, NULL);
 
        autoneg = cmd->base.autoneg == AUTONEG_ENABLE;
+       if (!autoneg && cmd->base.speed == SPEED_56000) {
+               netdev_err(dev, "56G not supported with autoneg off\n");
+               return -EINVAL;
+       }
        eth_proto_new = autoneg ?
                ops->to_ptys_advert_link(mlxsw_sp, cmd) :
                ops->to_ptys_speed(mlxsw_sp, cmd->base.speed);
-- 
2.20.1