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net/mlx5: Use read-modify-write when changing PCMR register values 

Currently changing a PCMR field is done by setting the field in a
zeroed buffer, zeroing other unrelated fields.
Fix this behaviour by modifying only the required field after first
reading the current register values, as a pre-step towards using more
fields in PCMR register.

Signed-off-by: Eli Britstein <elibr@mellanox.com>
Reviewed-by: Oz Shlomo <ozsh@mellanox.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
This commit is contained in:
Eli Britstein 2019-01-21 09:00:42 +02:00 committed by Saeed Mahameed
parent 2fce40a592
commit bfedc645de
1 changed files with 4 additions and 0 deletions
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4
drivers/net/ethernet/mellanox/mlx5/core/port.c
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@ -785,7 +785,11 @@ static int mlx5_set_ports_check(struct mlx5_core_dev *mdev, u32 *in, int inlen)
int mlx5_set_port_fcs(struct mlx5_core_dev *mdev, u8 enable)
{
u32 in[MLX5_ST_SZ_DW(pcmr_reg)] = {0};
int err;
err = mlx5_query_ports_check(mdev, in, sizeof(in));
if (err)
return err;
MLX5_SET(pcmr_reg, in, local_port, 1);
MLX5_SET(pcmr_reg, in, fcs_chk, enable);
return mlx5_set_ports_check(mdev, in, sizeof(in));