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net/mlx5e: Update rx ring hw mtu upon each rx-fcs flag change

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rq->hw_mtu is used in function en_rx.c/mlx5e_skb_from_cqe_mpwrq_linear()
to catch oversized packets. If FCS is concatenated to the end of the
packet then the check should be updated accordingly.

Rx rings initialization (mlx5e_init_rxq_rq()) invoked for every new set
of channels, as part of mlx5e_safe_switch_params(), unknowingly if it
runs with default configuration or not. Current rq->hw_mtu
initialization assumes default configuration and ignores
params->scatter_fcs_en flag state.
Fix this, by accounting for params->scatter_fcs_en flag state during
rq->hw_mtu initialization.

In addition, updating rq->hw_mtu value during ingress traffic might
lead to packets drop and oversize_pkts_sw_drop counter increase with no
good reason. Hence we remove this optimization and switch the set of
channels with a new one, to make sure we don't get false positives on
the oversize_pkts_sw_drop counter.

Fixes: 102722fc68 ("net/mlx5e: Add support for RXFCS feature flag")
Signed-off-by: Adham Faris <afaris@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
This commit is contained in:
Adham Faris 2023-01-08 18:09:32 +02:00 committed by Saeed Mahameed
parent 565b4824c3
commit 1e66220948
1 changed files with 15 additions and 71 deletions
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86
drivers/net/ethernet/mellanox/mlx5/core/en_main.c
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@ -591,7 +591,8 @@ static int mlx5e_init_rxq_rq(struct mlx5e_channel *c, struct mlx5e_params *param
rq->ix = c->ix;
rq->channel = c;
rq->mdev = mdev;
rq->hw_mtu = MLX5E_SW2HW_MTU(params, params->sw_mtu);
rq->hw_mtu =
MLX5E_SW2HW_MTU(params, params->sw_mtu) - ETH_FCS_LEN * !params->scatter_fcs_en;
rq->xdpsq = &c->rq_xdpsq;
rq->stats = &c->priv->channel_stats[c->ix]->rq;
rq->ptp_cyc2time = mlx5_rq_ts_translator(mdev);
@ -1014,35 +1015,6 @@ int mlx5e_flush_rq(struct mlx5e_rq *rq, int curr_state)
return mlx5e_rq_to_ready(rq, curr_state);
}
static int mlx5e_modify_rq_scatter_fcs(struct mlx5e_rq *rq, bool enable)
{
struct mlx5_core_dev *mdev = rq->mdev;
void *in;
void *rqc;
int inlen;
int err;
inlen = MLX5_ST_SZ_BYTES(modify_rq_in);
in = kvzalloc(inlen, GFP_KERNEL);
if (!in)
return -ENOMEM;
rqc = MLX5_ADDR_OF(modify_rq_in, in, ctx);
MLX5_SET(modify_rq_in, in, rq_state, MLX5_RQC_STATE_RDY);
MLX5_SET64(modify_rq_in, in, modify_bitmask,
MLX5_MODIFY_RQ_IN_MODIFY_BITMASK_SCATTER_FCS);
MLX5_SET(rqc, rqc, scatter_fcs, enable);
MLX5_SET(rqc, rqc, state, MLX5_RQC_STATE_RDY);
err = mlx5_core_modify_rq(mdev, rq->rqn, in);
kvfree(in);
return err;
}
static int mlx5e_modify_rq_vsd(struct mlx5e_rq *rq, bool vsd)
{
struct mlx5_core_dev *mdev = rq->mdev;
@ -3314,20 +3286,6 @@ static void mlx5e_cleanup_nic_tx(struct mlx5e_priv *priv)
mlx5e_destroy_tises(priv);
}
static int mlx5e_modify_channels_scatter_fcs(struct mlx5e_channels *chs, bool enable)
{
int err = 0;
int i;
for (i = 0; i < chs->num; i++) {
err = mlx5e_modify_rq_scatter_fcs(&chs->c[i]->rq, enable);
if (err)
return err;
}
return 0;
}
static int mlx5e_modify_channels_vsd(struct mlx5e_channels *chs, bool vsd)
{
int err;
@ -3903,41 +3861,27 @@ static int mlx5e_set_rx_port_ts(struct mlx5_core_dev *mdev, bool enable)
return mlx5_set_ports_check(mdev, in, sizeof(in));
}
static int mlx5e_set_rx_port_ts_wrap(struct mlx5e_priv *priv, void *ctx)
{
struct mlx5_core_dev *mdev = priv->mdev;
bool enable = *(bool *)ctx;
return mlx5e_set_rx_port_ts(mdev, enable);
}
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;
struct mlx5e_params new_params;
int err;
mutex_lock(&priv->state_lock);
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:
new_params = chs->params;
new_params.scatter_fcs_en = enable;
err = mlx5e_safe_switch_params(priv, &new_params, mlx5e_set_rx_port_ts_wrap,
&new_params.scatter_fcs_en, true);
mutex_unlock(&priv->state_lock);
return err;
}