From: Tariq Toukan <tariqt@nvidia.com>
Date: Wed, 29 Sep 2021 15:51:26 +0300
Subject: net/mlx5e: Improve MQPRIO resiliency
Patch-mainline: v5.15-rc5
Git-commit: 7dbc849b2ab3b8ea8f767361c46f914bb2b7779d
References: jsc#SLE-19253
* Add netdev->tc_to_txq rollback in case of failure in
mlx5e_update_netdev_queues().
* Fix broken transition between the two modes:
MQPRIO DCB mode with tc==8, and MQPRIO channel mode.
* Disable MQPRIO channel mode if re-attaching with a different number
of channels.
* Improve code sharing.
Fixes: ec60c4581bd9 ("net/mlx5e: Support MQPRIO channel mode")
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Maxim Mikityanskiy <maximmi@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/net/ethernet/mellanox/mlx5/core/en.h | 1
drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 111 +++++++++++++++-------
2 files changed, 80 insertions(+), 32 deletions(-)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en.h
@@ -252,6 +252,7 @@ struct mlx5e_params {
struct {
u16 mode;
u8 num_tc;
+ struct netdev_tc_txq tc_to_txq[TC_MAX_QUEUE];
} mqprio;
bool rx_cqe_compress_def;
bool tunneled_offload_en;
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -2264,7 +2264,7 @@ void mlx5e_set_netdev_mtu_boundaries(str
}
static int mlx5e_netdev_set_tcs(struct net_device *netdev, u16 nch, u8 ntc,
- struct tc_mqprio_qopt_offload *mqprio)
+ struct netdev_tc_txq *tc_to_txq)
{
int tc, err;
@@ -2282,11 +2282,8 @@ static int mlx5e_netdev_set_tcs(struct n
for (tc = 0; tc < ntc; tc++) {
u16 count, offset;
- /* For DCB mode, map netdev TCs to offset 0
- * We have our own UP to TXQ mapping for QoS
- */
- count = mqprio ? mqprio->qopt.count[tc] : nch;
- offset = mqprio ? mqprio->qopt.offset[tc] : 0;
+ count = tc_to_txq[tc].count;
+ offset = tc_to_txq[tc].offset;
netdev_set_tc_queue(netdev, tc, count, offset);
}
@@ -2315,19 +2312,24 @@ int mlx5e_update_tx_netdev_queues(struct
static int mlx5e_update_netdev_queues(struct mlx5e_priv *priv)
{
+ struct netdev_tc_txq old_tc_to_txq[TC_MAX_QUEUE], *tc_to_txq;
struct net_device *netdev = priv->netdev;
int old_num_txqs, old_ntc;
int num_rxqs, nch, ntc;
int err;
+ int i;
old_num_txqs = netdev->real_num_tx_queues;
old_ntc = netdev->num_tc ? : 1;
+ for (i = 0; i < ARRAY_SIZE(old_tc_to_txq); i++)
+ old_tc_to_txq[i] = netdev->tc_to_txq[i];
nch = priv->channels.params.num_channels;
- ntc = mlx5e_get_dcb_num_tc(&priv->channels.params);
+ ntc = priv->channels.params.mqprio.num_tc;
num_rxqs = nch * priv->profile->rq_groups;
+ tc_to_txq = priv->channels.params.mqprio.tc_to_txq;
- err = mlx5e_netdev_set_tcs(netdev, nch, ntc, NULL);
+ err = mlx5e_netdev_set_tcs(netdev, nch, ntc, tc_to_txq);
if (err)
goto err_out;
err = mlx5e_update_tx_netdev_queues(priv);
@@ -2350,11 +2352,14 @@ err_txqs:
WARN_ON_ONCE(netif_set_real_num_tx_queues(netdev, old_num_txqs));
err_tcs:
- mlx5e_netdev_set_tcs(netdev, old_num_txqs / old_ntc, old_ntc, NULL);
+ WARN_ON_ONCE(mlx5e_netdev_set_tcs(netdev, old_num_txqs / old_ntc, old_ntc,
+ old_tc_to_txq));
err_out:
return err;
}
+static MLX5E_DEFINE_PREACTIVATE_WRAPPER_CTX(mlx5e_update_netdev_queues);
+
static void mlx5e_set_default_xps_cpumasks(struct mlx5e_priv *priv,
struct mlx5e_params *params)
{
@@ -2861,6 +2866,58 @@ static int mlx5e_modify_channels_vsd(str
return 0;
}
+static void mlx5e_mqprio_build_default_tc_to_txq(struct netdev_tc_txq *tc_to_txq,
+ int ntc, int nch)
+{
+ int tc;
+
+ memset(tc_to_txq, 0, sizeof(*tc_to_txq) * TC_MAX_QUEUE);
+
+ /* Map netdev TCs to offset 0.
+ * We have our own UP to TXQ mapping for DCB mode of QoS
+ */
+ for (tc = 0; tc < ntc; tc++) {
+ tc_to_txq[tc] = (struct netdev_tc_txq) {
+ .count = nch,
+ .offset = 0,
+ };
+ }
+}
+
+static void mlx5e_mqprio_build_tc_to_txq(struct netdev_tc_txq *tc_to_txq,
+ struct tc_mqprio_qopt *qopt)
+{
+ int tc;
+
+ for (tc = 0; tc < TC_MAX_QUEUE; tc++) {
+ tc_to_txq[tc] = (struct netdev_tc_txq) {
+ .count = qopt->count[tc],
+ .offset = qopt->offset[tc],
+ };
+ }
+}
+
+static void mlx5e_params_mqprio_dcb_set(struct mlx5e_params *params, u8 num_tc)
+{
+ params->mqprio.mode = TC_MQPRIO_MODE_DCB;
+ params->mqprio.num_tc = num_tc;
+ mlx5e_mqprio_build_default_tc_to_txq(params->mqprio.tc_to_txq, num_tc,
+ params->num_channels);
+}
+
+static void mlx5e_params_mqprio_channel_set(struct mlx5e_params *params,
+ struct tc_mqprio_qopt *qopt)
+{
+ params->mqprio.mode = TC_MQPRIO_MODE_CHANNEL;
+ params->mqprio.num_tc = qopt->num_tc;
+ mlx5e_mqprio_build_tc_to_txq(params->mqprio.tc_to_txq, qopt);
+}
+
+static void mlx5e_params_mqprio_reset(struct mlx5e_params *params)
+{
+ mlx5e_params_mqprio_dcb_set(params, 1);
+}
+
static int mlx5e_setup_tc_mqprio_dcb(struct mlx5e_priv *priv,
struct tc_mqprio_qopt *mqprio)
{
@@ -2874,8 +2931,7 @@ static int mlx5e_setup_tc_mqprio_dcb(str
return -EINVAL;
new_params = priv->channels.params;
- new_params.mqprio.mode = TC_MQPRIO_MODE_DCB;
- new_params.mqprio.num_tc = tc ? tc : 1;
+ mlx5e_params_mqprio_dcb_set(&new_params, tc ? tc : 1);
err = mlx5e_safe_switch_params(priv, &new_params,
mlx5e_num_channels_changed_ctx, NULL, true);
@@ -2926,25 +2982,12 @@ static int mlx5e_mqprio_channel_validate
return 0;
}
-static int mlx5e_mqprio_channel_set_tcs_ctx(struct mlx5e_priv *priv, void *ctx)
-{
- struct tc_mqprio_qopt_offload *mqprio = (struct tc_mqprio_qopt_offload *)ctx;
- struct net_device *netdev = priv->netdev;
- u8 num_tc;
-
- if (priv->channels.params.mqprio.mode != TC_MQPRIO_MODE_CHANNEL)
- return -EINVAL;
-
- num_tc = priv->channels.params.mqprio.num_tc;
- mlx5e_netdev_set_tcs(netdev, 0, num_tc, mqprio);
-
- return 0;
-}
-
static int mlx5e_setup_tc_mqprio_channel(struct mlx5e_priv *priv,
struct tc_mqprio_qopt_offload *mqprio)
{
+ mlx5e_fp_preactivate preactivate;
struct mlx5e_params new_params;
+ bool nch_changed;
int err;
err = mlx5e_mqprio_channel_validate(priv, mqprio);
@@ -2952,12 +2995,12 @@ static int mlx5e_setup_tc_mqprio_channel
return err;
new_params = priv->channels.params;
- new_params.mqprio.mode = TC_MQPRIO_MODE_CHANNEL;
- new_params.mqprio.num_tc = mqprio->qopt.num_tc;
- err = mlx5e_safe_switch_params(priv, &new_params,
- mlx5e_mqprio_channel_set_tcs_ctx, mqprio, true);
+ mlx5e_params_mqprio_channel_set(&new_params, &mqprio->qopt);
- return err;
+ nch_changed = mlx5e_get_dcb_num_tc(&priv->channels.params) > 1;
+ preactivate = nch_changed ? mlx5e_num_channels_changed_ctx :
+ mlx5e_update_netdev_queues_ctx;
+ return mlx5e_safe_switch_params(priv, &new_params, preactivate, NULL, true);
}
static int mlx5e_setup_tc_mqprio(struct mlx5e_priv *priv,
@@ -4190,7 +4233,7 @@ void mlx5e_build_nic_params(struct mlx5e
params->hard_mtu = MLX5E_ETH_HARD_MTU;
params->num_channels = min_t(unsigned int, MLX5E_MAX_NUM_CHANNELS / 2,
priv->max_nch);
- params->mqprio.num_tc = 1;
+ mlx5e_params_mqprio_reset(params);
/* Set an initial non-zero value, so that mlx5e_select_queue won't
* divide by zero if called before first activating channels.
@@ -4823,6 +4866,10 @@ int mlx5e_attach_netdev(struct mlx5e_pri
*/
priv->netdev->priv_flags &= ~IFF_RXFH_CONFIGURED;
priv->channels.params.num_channels = max_nch;
+ if (priv->channels.params.mqprio.mode == TC_MQPRIO_MODE_CHANNEL) {
+ mlx5_core_warn(priv->mdev, "MLX5E: Disabling MQPRIO channel mode\n");
+ mlx5e_params_mqprio_reset(&priv->channels.params);
+ }
}
if (max_nch != priv->max_nch) {
mlx5_core_warn(priv->mdev,