[PATCH 5.14 105/151] net/mlx5e: Mutually exclude RX-FCS and RX-port-timestamp

Greg Kroah-Hartman
2021-10-18T13:59:51Z

From: Aya Levin <ayal@nvidia.com>

commit 0bc73ad46a76ed6ece4dcacb28858e7b38561e1c upstream.

Due to current HW arch limitations, RX-FCS (scattering FCS frame field
to software) and RX-port-timestamp (improved timestamp accuracy on the
receive side) can't work together.
RX-port-timestamp is not controlled by the user and it is enabled by
default when supported by the HW/FW.
This patch sets RX-port-timestamp opposite to RX-FCS configuration.

Fixes: 102722fc6832 ("net/mlx5e: Add support for RXFCS feature flag")
Signed-off-by: Aya Levin <ayal@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Moshe Shemesh <moshe@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 57 ++++++++++++++++++++--
include/linux/mlx5/mlx5_ifc.h | 10 +++
2 files changed, 60 insertions(+), 7 deletions(-)

--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -3724,20 +3724,67 @@ static int set_feature_rx_all(struct net
return mlx5_set_port_fcs(mdev, !enable);
}

+static int mlx5e_set_rx_port_ts(struct mlx5_core_dev *mdev, bool enable)
+{
+ u32 in[MLX5_ST_SZ_DW(pcmr_reg)] = {};
+ bool supported, curr_state;
+ int err;
+
+ if (!MLX5_CAP_GEN(mdev, ports_check))
+ return 0;
+
+ err = mlx5_query_ports_check(mdev, in, sizeof(in));
+ if (err)
+ return err;
+
+ supported = MLX5_GET(pcmr_reg, in, rx_ts_over_crc_cap);
+ curr_state = MLX5_GET(pcmr_reg, in, rx_ts_over_crc);
+
+ if (!supported || enable == curr_state)
+ return 0;
+
+ MLX5_SET(pcmr_reg, in, local_port, 1);
+ MLX5_SET(pcmr_reg, in, rx_ts_over_crc, enable);
+
+ return mlx5_set_ports_check(mdev, in, sizeof(in));
+}
+
static int set_feature_rx_fcs(struct net_device *netdev, bool enable)
{
struct mlx5e_priv *priv = netdev_priv(netdev);
+ struct mlx5e_channels *chs = &priv->channels;
+ struct mlx5_core_dev *mdev = priv->mdev;
int err;

mutex_lock(&priv->state_lock);

- priv->channels.params.scatter_fcs_en = enable;
- err = mlx5e_modify_channels_scatter_fcs(&priv->channels, enable);
- if (err)
- priv->channels.params.scatter_fcs_en = !enable;
+ if (enable) {
+ err = mlx5e_set_rx_port_ts(mdev, false);
+ if (err)
+ goto out;
+
+ chs->params.scatter_fcs_en = true;
+ err = mlx5e_modify_channels_scatter_fcs(chs, true);
+ if (err) {
+ chs->params.scatter_fcs_en = false;
+ mlx5e_set_rx_port_ts(mdev, true);
+ }
+ } else {
+ chs->params.scatter_fcs_en = false;
+ err = mlx5e_modify_channels_scatter_fcs(chs, false);
+ if (err) {
+ chs->params.scatter_fcs_en = true;
+ goto out;
+ }
+ err = mlx5e_set_rx_port_ts(mdev, true);
+ if (err) {
+ mlx5_core_warn(mdev, "Failed to set RX port timestamp %d\n", err);
+ err = 0;
+ }
+ }

+out:
mutex_unlock(&priv->state_lock);
-
return err;
}

--- a/include/linux/mlx5/mlx5_ifc.h
+++ b/include/linux/mlx5/mlx5_ifc.h
@@ -9467,16 +9467,22 @@ struct mlx5_ifc_pcmr_reg_bits {
u8 reserved_at_0[0x8];
u8 local_port[0x8];
u8 reserved_at_10[0x10];
+
u8 entropy_force_cap[0x1];
u8 entropy_calc_cap[0x1];
u8 entropy_gre_calc_cap[0x1];
- u8 reserved_at_23[0x1b];
+ u8 reserved_at_23[0xf];
+ u8 rx_ts_over_crc_cap[0x1];
+ u8 reserved_at_33[0xb];
u8 fcs_cap[0x1];
u8 reserved_at_3f[0x1];
+
u8 entropy_force[0x1];
u8 entropy_calc[0x1];
u8 entropy_gre_calc[0x1];
- u8 reserved_at_43[0x1b];
+ u8 reserved_at_43[0xf];
+ u8 rx_ts_over_crc[0x1];
+ u8 reserved_at_53[0xb];
u8 fcs_chk[0x1];
u8 reserved_at_5f[0x1];
};