net/mlx5e: Allow profile-specific limitation on max num of channels

Let SF/VF representor's netdev use profile-specific limitation on
max_nch to reduce its memory and HW resources consumption.

This is particularly important for environments with limited memory
and high number of SFs.

Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Vu Pham <vuhuong@nvidia.com>
Reviewed-by: Moshe Shemesh <moshe@nvidia.com>
Reviewed-by: Parav Pandit <parav@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en.h b/drivers/net/ethernet/mellanox/mlx5/core/en.h
index 14497b4..c281251 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en.h
@@ -972,6 +972,7 @@ struct mlx5e_profile {
        int     (*update_rx)(struct mlx5e_priv *priv);
        void    (*update_stats)(struct mlx5e_priv *priv);
        void    (*update_carrier)(struct mlx5e_priv *priv);
+       int     (*max_nch_limit)(struct mlx5_core_dev *mdev);
        unsigned int (*stats_grps_num)(struct mlx5e_priv *priv);
        mlx5e_stats_grp_t *stats_grps;
        const struct mlx5e_rx_handlers *rx_handlers;

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index 75984ed..e4a79ba 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -5098,6 +5098,18 @@ static const struct mlx5e_profile mlx5e_nic_profile = {
                BIT(MLX5E_PROFILE_FEATURE_QOS_HTB),
 };
 
+static int mlx5e_profile_max_num_channels(struct mlx5_core_dev *mdev,
+                                         const struct mlx5e_profile *profile)
+{
+       int nch;
+
+       nch = mlx5e_get_max_num_channels(mdev);
+
+       if (profile->max_nch_limit)
+               nch = min_t(int, nch, profile->max_nch_limit(mdev));
+       return nch;
+}
+
 static unsigned int
 mlx5e_calc_max_nch(struct mlx5_core_dev *mdev, struct net_device *netdev,
                   const struct mlx5e_profile *profile)
@@ -5106,7 +5118,7 @@ mlx5e_calc_max_nch(struct mlx5_core_dev *mdev, struct net_device *netdev,
        unsigned int max_nch, tmp;
 
        /* core resources */
-       max_nch = mlx5e_get_max_num_channels(mdev);
+       max_nch = mlx5e_profile_max_num_channels(mdev, profile);
 
        /* netdev rx queues */
        tmp = netdev->num_rx_queues / max_t(u8, profile->rq_groups, 1);
@@ -5235,7 +5247,7 @@ static unsigned int mlx5e_get_max_num_txqs(struct mlx5_core_dev *mdev,
 {
        unsigned int nch, ptp_txqs, qos_txqs;
 
-       nch = mlx5e_get_max_num_channels(mdev);
+       nch = mlx5e_profile_max_num_channels(mdev, profile);
 
        ptp_txqs = MLX5_CAP_GEN(mdev, ts_cqe_to_dest_cqn) &&
                mlx5e_profile_feature_cap(profile, PTP_TX) ?
@@ -5253,7 +5265,7 @@ static unsigned int mlx5e_get_max_num_rxqs(struct mlx5_core_dev *mdev,
 {
        unsigned int nch;
 
-       nch = mlx5e_get_max_num_channels(mdev);
+       nch = mlx5e_profile_max_num_channels(mdev, profile);
 
        return nch * profile->rq_groups;
 }

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
index 0bd3721..8c0f4cf 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
@@ -591,6 +591,12 @@ bool mlx5e_eswitch_vf_rep(const struct net_device *netdev)
        return netdev->netdev_ops == &mlx5e_netdev_ops_rep;
 }
 
+static int mlx5e_rep_max_nch_limit(struct mlx5_core_dev *mdev)
+{
+       return (1 << MLX5_CAP_GEN(mdev, log_max_tir)) /
+               mlx5_eswitch_get_total_vports(mdev);
+}
+
 static void mlx5e_build_rep_params(struct net_device *netdev)
 {
        struct mlx5e_priv *priv = netdev_priv(netdev);
@@ -1113,6 +1119,7 @@ static const struct mlx5e_profile mlx5e_rep_profile = {
        .rq_groups              = MLX5E_NUM_RQ_GROUPS(REGULAR),
        .stats_grps             = mlx5e_rep_stats_grps,
        .stats_grps_num         = mlx5e_rep_stats_grps_num,
+       .max_nch_limit          = mlx5e_rep_max_nch_limit,
 };
 
 static const struct mlx5e_profile mlx5e_uplink_rep_profile = {