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net/mlx5e: Fix a bug in turning off FEC policy in unsupported speeds

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Some speeds don't support turning FEC policy off. In case a requested
FEC policy is not supported for a speed (including current speed), its new
FEC policy would be:
	no FEC - if disabling FEC is supported for that speed
	unchanged - else

Fixes: 2095b26414 ("net/mlx5e: Add port FEC get/set functions")
Signed-off-by: Shay Agroskin <shayag@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
This commit is contained in:
Shay Agroskin 2018-10-28 16:13:46 +02:00 committed by Saeed Mahameed
parent 228c4cd04d
commit 9cdeaab3b7
1 changed files with 12 additions and 16 deletions
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28
drivers/net/ethernet/mellanox/mlx5/core/en/port.c
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@ -394,12 +394,12 @@ int mlx5e_get_fec_mode(struct mlx5_core_dev *dev, u32 *fec_mode_active,
int mlx5e_set_fec_mode(struct mlx5_core_dev *dev, u8 fec_policy)
{
u8 fec_policy_nofec = BIT(MLX5E_FEC_NOFEC);
bool fec_mode_not_supp_in_speed = false;
u8 no_fec_policy = BIT(MLX5E_FEC_NOFEC);
u32 out[MLX5_ST_SZ_DW(pplm_reg)] = {};
u32 in[MLX5_ST_SZ_DW(pplm_reg)] = {};
int sz = MLX5_ST_SZ_BYTES(pplm_reg);
u32 current_fec_speed;
u8 fec_policy_auto = 0;
u8 fec_caps = 0;
int err;
int i;
@ -415,23 +415,19 @@ int mlx5e_set_fec_mode(struct mlx5_core_dev *dev, u8 fec_policy)
if (err)
return err;
err = mlx5e_port_linkspeed(dev, &current_fec_speed);
if (err)
return err;
MLX5_SET(pplm_reg, out, local_port, 1);
memset(in, 0, sz);
MLX5_SET(pplm_reg, in, local_port, 1);
for (i = 0; i < MLX5E_FEC_SUPPORTED_SPEEDS && !!fec_policy; i++) {
for (i = 0; i < MLX5E_FEC_SUPPORTED_SPEEDS; i++) {
mlx5e_get_fec_cap_field(out, &fec_caps, fec_supported_speeds[i]);
/* policy supported for link speed */
if (!!(fec_caps & fec_policy)) {
mlx5e_fec_admin_field(in, &fec_policy, 1,
/* policy supported for link speed, or policy is auto */
if (fec_caps & fec_policy || fec_policy == fec_policy_auto) {
mlx5e_fec_admin_field(out, &fec_policy, 1,
fec_supported_speeds[i]);
} else {
if (fec_supported_speeds[i] == current_fec_speed)
return -EOPNOTSUPP;
mlx5e_fec_admin_field(in, &no_fec_policy, 1,
fec_supported_speeds[i]);
/* turn off FEC if supported. Else, leave it the same */
if (fec_caps & fec_policy_nofec)
mlx5e_fec_admin_field(out, &fec_policy_nofec, 1,
fec_supported_speeds[i]);
fec_mode_not_supp_in_speed = true;
}
}
@ -441,5 +437,5 @@ int mlx5e_set_fec_mode(struct mlx5_core_dev *dev, u8 fec_policy)
"FEC policy 0x%x is not supported for some speeds",
fec_policy);
return mlx5_core_access_reg(dev, in, sz, out, sz, MLX5_REG_PPLM, 0, 1);
return mlx5_core_access_reg(dev, out, sz, out, sz, MLX5_REG_PPLM, 0, 1);
}