Merge branch 'mlx5-misc-patches'

Tariq Toukan says:

====================
mlx5 misc patches

This series includes patches for the mlx5 driver.

Patch 1 by Shay enables LAG with HCAs of 8 ports.

Patch 2 by Carolina optimizes the safe switch channels operation for the
TX-only changes.

Patch 3 by Parav cleans up some unused code.
====================

Link: https://lore.kernel.org/r/20240512124306.740898-1-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/mellanox/mlx5/core/en.h

@@ -1102,6 +1102,7 @@ int mlx5e_safe_switch_params(struct mlx5e_priv *priv,
 			     void *context, bool reset);
 int mlx5e_update_tx_netdev_queues(struct mlx5e_priv *priv);
 int mlx5e_num_channels_changed_ctx(struct mlx5e_priv *priv, void *context);
+int mlx5e_update_tc_and_tx_queues_ctx(struct mlx5e_priv *priv, void *context);
 void mlx5e_activate_priv_channels(struct mlx5e_priv *priv);
 void mlx5e_deactivate_priv_channels(struct mlx5e_priv *priv);
 int mlx5e_ptp_rx_manage_fs_ctx(struct mlx5e_priv *priv, void *ctx);

drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c

@@ -2292,7 +2292,7 @@ static int set_pflag_tx_port_ts(struct net_device *netdev, bool enable)
 	 */
 
 	err = mlx5e_safe_switch_params(priv, &new_params,
-				       mlx5e_num_channels_changed_ctx, NULL, true);
+				       mlx5e_update_tc_and_tx_queues_ctx, NULL, true);
 	if (!err)
 		priv->tx_ptp_opened = true;
 

drivers/net/ethernet/mellanox/mlx5/core/en_main.c

@@ -3002,7 +3002,28 @@ int mlx5e_update_tx_netdev_queues(struct mlx5e_priv *priv)
 	return err;
 }
 
-static int mlx5e_update_netdev_queues(struct mlx5e_priv *priv)
+static void mlx5e_set_default_xps_cpumasks(struct mlx5e_priv *priv,
+					   struct mlx5e_params *params)
+{
+	struct mlx5_core_dev *mdev = priv->mdev;
+	int num_comp_vectors, ix, irq;
+
+	num_comp_vectors = mlx5_comp_vectors_max(mdev);
+
+	for (ix = 0; ix < params->num_channels; ix++) {
+		cpumask_clear(priv->scratchpad.cpumask);
+
+		for (irq = ix; irq < num_comp_vectors; irq += params->num_channels) {
+			int cpu = mlx5_comp_vector_get_cpu(mdev, irq);
+
+			cpumask_set_cpu(cpu, priv->scratchpad.cpumask);
+		}
+
+		netif_set_xps_queue(priv->netdev, priv->scratchpad.cpumask, ix);
+	}
+}
+
+static int mlx5e_update_tc_and_tx_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;
@@ -3026,65 +3047,43 @@ static int mlx5e_update_netdev_queues(struct mlx5e_priv *priv)
 	err = mlx5e_update_tx_netdev_queues(priv);
 	if (err)
 		goto err_tcs;
-	err = netif_set_real_num_rx_queues(netdev, nch);
-	if (err) {
-		netdev_warn(netdev, "netif_set_real_num_rx_queues failed, %d\n", err);
-		goto err_txqs;
-	}
+	mlx5e_set_default_xps_cpumasks(priv, &priv->channels.params);
 
 	return 0;
 
-err_txqs:
-	/* netif_set_real_num_rx_queues could fail only when nch increased. Only
-	 * one of nch and ntc is changed in this function. That means, the call
-	 * to netif_set_real_num_tx_queues below should not fail, because it
-	 * decreases the number of TX queues.
-	 */
-	WARN_ON_ONCE(netif_set_real_num_tx_queues(netdev, old_num_txqs));
-
 err_tcs:
 	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)
-{
-	int ix;
-
-	for (ix = 0; ix < params->num_channels; ix++) {
-		int num_comp_vectors, irq, vec_ix;
-		struct mlx5_core_dev *mdev;
-
-		mdev = mlx5_sd_ch_ix_get_dev(priv->mdev, ix);
-		num_comp_vectors = mlx5_comp_vectors_max(mdev);
-		cpumask_clear(priv->scratchpad.cpumask);
-		vec_ix = mlx5_sd_ch_ix_get_vec_ix(mdev, ix);
-
-		for (irq = vec_ix; irq < num_comp_vectors; irq += params->num_channels) {
-			int cpu = mlx5_comp_vector_get_cpu(mdev, irq);
-
-			cpumask_set_cpu(cpu, priv->scratchpad.cpumask);
-		}
-
-		netif_set_xps_queue(priv->netdev, priv->scratchpad.cpumask, ix);
-	}
-}
+MLX5E_DEFINE_PREACTIVATE_WRAPPER_CTX(mlx5e_update_tc_and_tx_queues);
 
 static int mlx5e_num_channels_changed(struct mlx5e_priv *priv)
 {
 	u16 count = priv->channels.params.num_channels;
+	struct net_device *netdev = priv->netdev;
+	int old_num_rxqs;
 	int err;
 
-	err = mlx5e_update_netdev_queues(priv);
-	if (err)
+	old_num_rxqs = netdev->real_num_rx_queues;
+	err = netif_set_real_num_rx_queues(netdev, count);
+	if (err) {
+		netdev_warn(netdev, "%s: netif_set_real_num_rx_queues failed, %d\n",
+			    __func__, err);
 		return err;
-
-	mlx5e_set_default_xps_cpumasks(priv, &priv->channels.params);
+	}
+	err = mlx5e_update_tc_and_tx_queues(priv);
+	if (err) {
+		/* mlx5e_update_tc_and_tx_queues can fail if channels or TCs number increases.
+		 * Since channel number changed, it increased. That means, the call to
+		 * netif_set_real_num_rx_queues below should not fail, because it
+		 * decreases the number of RX queues.
+		 */
+		WARN_ON_ONCE(netif_set_real_num_rx_queues(netdev, old_num_rxqs));
+		return err;
+	}
 
 	/* This function may be called on attach, before priv->rx_res is created. */
 	if (priv->rx_res) {
@@ -3617,7 +3616,7 @@ static int mlx5e_setup_tc_mqprio_dcb(struct mlx5e_priv *priv,
 	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);
+				       mlx5e_update_tc_and_tx_queues_ctx, NULL, true);
 
 	if (!err && priv->mqprio_rl) {
 		mlx5e_mqprio_rl_cleanup(priv->mqprio_rl);
@@ -3718,10 +3717,8 @@ static struct mlx5e_mqprio_rl *mlx5e_mqprio_rl_create(struct mlx5_core_dev *mdev
 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;
 	struct mlx5e_mqprio_rl *rl;
-	bool nch_changed;
 	int err;
 
 	err = mlx5e_mqprio_channel_validate(priv, mqprio);
@@ -3735,10 +3732,8 @@ static int mlx5e_setup_tc_mqprio_channel(struct mlx5e_priv *priv,
 	new_params = priv->channels.params;
 	mlx5e_params_mqprio_channel_set(&new_params, mqprio, rl);
 
-	nch_changed = mlx5e_get_dcb_num_tc(&priv->channels.params) > 1;
-	preactivate = nch_changed ? mlx5e_num_channels_changed_ctx :
-		mlx5e_update_netdev_queues_ctx;
-	err = mlx5e_safe_switch_params(priv, &new_params, preactivate, NULL, true);
+	err = mlx5e_safe_switch_params(priv, &new_params,
+				       mlx5e_update_tc_and_tx_queues_ctx, NULL, true);
 	if (err) {
 		if (rl) {
 			mlx5e_mqprio_rl_cleanup(rl);

drivers/net/ethernet/mellanox/mlx5/core/lag/lag.c

@@ -713,7 +713,6 @@ int mlx5_deactivate_lag(struct mlx5_lag *ldev)
 	return 0;
 }
 
-#define MLX5_LAG_OFFLOADS_SUPPORTED_PORTS 4
 bool mlx5_lag_check_prereq(struct mlx5_lag *ldev)
 {
 #ifdef CONFIG_MLX5_ESWITCH
@@ -739,8 +738,6 @@ bool mlx5_lag_check_prereq(struct mlx5_lag *ldev)
 		if (mlx5_eswitch_mode(ldev->pf[i].dev) != mode)
 			return false;
 
-	if (mode == MLX5_ESWITCH_OFFLOADS && ldev->ports > MLX5_LAG_OFFLOADS_SUPPORTED_PORTS)
-		return false;
 #else
 	for (i = 0; i < ldev->ports; i++)
 		if (mlx5_sriov_is_enabled(ldev->pf[i].dev))

drivers/net/ethernet/mellanox/mlx5/core/pci_irq.c

@@ -507,58 +507,6 @@ struct mlx5_irq *mlx5_irq_request(struct mlx5_core_dev *dev, u16 vecidx,
 	return irq;
 }
 
-/**
- * mlx5_msix_alloc - allocate msix interrupt
- * @dev: mlx5 device from which to request
- * @handler: interrupt handler
- * @affdesc: affinity descriptor
- * @name: interrupt name
- *
- * Returns: struct msi_map with result encoded.
- * Note: the caller must make sure to release the irq by calling
- *       mlx5_msix_free() if shutdown was initiated.
- */
-struct msi_map mlx5_msix_alloc(struct mlx5_core_dev *dev,
-			       irqreturn_t (*handler)(int, void *),
-			       const struct irq_affinity_desc *affdesc,
-			       const char *name)
-{
-	struct msi_map map;
-	int err;
-
-	if (!dev->pdev) {
-		map.virq = 0;
-		map.index = -EINVAL;
-		return map;
-	}
-
-	map = pci_msix_alloc_irq_at(dev->pdev, MSI_ANY_INDEX, affdesc);
-	if (!map.virq)
-		return map;
-
-	err = request_irq(map.virq, handler, 0, name, NULL);
-	if (err) {
-		mlx5_core_warn(dev, "err %d\n", err);
-		pci_msix_free_irq(dev->pdev, map);
-		map.virq = 0;
-		map.index = -ENOMEM;
-	}
-	return map;
-}
-EXPORT_SYMBOL(mlx5_msix_alloc);
-
-/**
- * mlx5_msix_free - free a previously allocated msix interrupt
- * @dev: mlx5 device associated with interrupt
- * @map: map previously returned by mlx5_msix_alloc()
- */
-void mlx5_msix_free(struct mlx5_core_dev *dev, struct msi_map map)
-{
-	free_irq(map.virq, NULL);
-	pci_msix_free_irq(dev->pdev, map);
-}
-EXPORT_SYMBOL(mlx5_msix_free);
-
 /**
  * mlx5_irq_release_vector - release one IRQ back to the system.
  * @irq: the irq to release.

include/linux/mlx5/driver.h

@@ -85,7 +85,7 @@ enum mlx5_sqp_t {
 };
 
 enum {
-	MLX5_MAX_PORTS	= 4,
+	MLX5_MAX_PORTS	= 8,
 };
 
 enum {
@@ -1374,11 +1374,4 @@ static inline bool mlx5_is_macsec_roce_supported(struct mlx5_core_dev *mdev)
 enum {
 	MLX5_OCTWORD = 16,
 };
-
-struct msi_map mlx5_msix_alloc(struct mlx5_core_dev *dev,
-			       irqreturn_t (*handler)(int, void *),
-			       const struct irq_affinity_desc *affdesc,
-			       const char *name);
-void mlx5_msix_free(struct mlx5_core_dev *dev, struct msi_map map);
-
 #endif /* MLX5_DRIVER_H */