net/mlx5: Use software VHCA id when it's supported

Use software VHCA id when it's supported by the firmware.

A unique id is allocated upon mlx5_mdev_init() and freed upon
mlx5_mdev_uninit(), as such it stays the same during the full life cycle
of the device including upon health recovery if occurred.

The conjunction of sw_vhca_id with sw_owner_id will be a global unique
id per function which uses mlx5_core.

The sw_vhca_id is set upon init_hca command and is used to specify the
VHCA that the NIC vport is affiliated with.

This functionality is needed upon migration of VM which is MPV based.
(i.e. multi port device).
Signed-off-by: Yishai Hadas <yishaih@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

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

@@ -289,6 +289,10 @@ int mlx5_cmd_init_hca(struct mlx5_core_dev *dev, uint32_t *sw_owner_id)
 				       sw_owner_id[i]);
 	}
 
+	if (MLX5_CAP_GEN_2_MAX(dev, sw_vhca_id_valid) &&
+	    dev->priv.sw_vhca_id > 0)
+		MLX5_SET(init_hca_in, in, sw_vhca_id, dev->priv.sw_vhca_id);
+
 	return mlx5_cmd_exec_in(dev, init_hca, in);
 }
 

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

@@ -90,6 +90,8 @@ module_param_named(prof_sel, prof_sel, uint, 0444);
 MODULE_PARM_DESC(prof_sel, "profile selector. Valid range 0 - 2");
 
 static u32 sw_owner_id[4];
+#define MAX_SW_VHCA_ID (BIT(__mlx5_bit_sz(cmd_hca_cap_2, sw_vhca_id)) - 1)
+static DEFINE_IDA(sw_vhca_ida);
 
 enum {
 	MLX5_ATOMIC_REQ_MODE_BE = 0x0,
@@ -492,6 +494,31 @@ static int max_uc_list_get_devlink_param(struct mlx5_core_dev *dev)
 	return err;
 }
 
+static int handle_hca_cap_2(struct mlx5_core_dev *dev, void *set_ctx)
+{
+	void *set_hca_cap;
+	int err;
+
+	if (!MLX5_CAP_GEN_MAX(dev, hca_cap_2))
+		return 0;
+
+	err = mlx5_core_get_caps(dev, MLX5_CAP_GENERAL_2);
+	if (err)
+		return err;
+
+	if (!MLX5_CAP_GEN_2_MAX(dev, sw_vhca_id_valid) ||
+	    !(dev->priv.sw_vhca_id > 0))
+		return 0;
+
+	set_hca_cap = MLX5_ADDR_OF(set_hca_cap_in, set_ctx,
+				   capability);
+	memcpy(set_hca_cap, dev->caps.hca[MLX5_CAP_GENERAL_2]->cur,
+	       MLX5_ST_SZ_BYTES(cmd_hca_cap_2));
+	MLX5_SET(cmd_hca_cap_2, set_hca_cap, sw_vhca_id_valid, 1);
+
+	return set_caps(dev, set_ctx, MLX5_CAP_GENERAL_2);
+}
+
 static int handle_hca_cap(struct mlx5_core_dev *dev, void *set_ctx)
 {
 	struct mlx5_profile *prof = &dev->profile;
@@ -662,6 +689,13 @@ static int set_hca_cap(struct mlx5_core_dev *dev)
 		goto out;
 	}
 
+	memset(set_ctx, 0, set_sz);
+	err = handle_hca_cap_2(dev, set_ctx);
+	if (err) {
+		mlx5_core_err(dev, "handle_hca_cap_2 failed\n");
+		goto out;
+	}
+
 out:
 	kfree(set_ctx);
 	return err;
@@ -1506,6 +1540,18 @@ int mlx5_mdev_init(struct mlx5_core_dev *dev, int profile_idx)
 	if (err)
 		goto err_hca_caps;
 
+	/* The conjunction of sw_vhca_id with sw_owner_id will be a global
+	 * unique id per function which uses mlx5_core.
+	 * Those values are supplied to FW as part of the init HCA command to
+	 * be used by both driver and FW when it's applicable.
+	 */
+	dev->priv.sw_vhca_id = ida_alloc_range(&sw_vhca_ida, 1,
+					       MAX_SW_VHCA_ID,
+					       GFP_KERNEL);
+	if (dev->priv.sw_vhca_id < 0)
+		mlx5_core_err(dev, "failed to allocate sw_vhca_id, err=%d\n",
+			      dev->priv.sw_vhca_id);
+
 	return 0;
 
 err_hca_caps:
@@ -1530,6 +1576,9 @@ void mlx5_mdev_uninit(struct mlx5_core_dev *dev)
 {
 	struct mlx5_priv *priv = &dev->priv;
 
+	if (priv->sw_vhca_id > 0)
+		ida_free(&sw_vhca_ida, dev->priv.sw_vhca_id);
+
 	mlx5_hca_caps_free(dev);
 	mlx5_adev_cleanup(dev);
 	mlx5_pagealloc_cleanup(dev);

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

@@ -1086,9 +1086,17 @@ int mlx5_nic_vport_affiliate_multiport(struct mlx5_core_dev *master_mdev,
 		goto free;
 
 	MLX5_SET(modify_nic_vport_context_in, in, field_select.affiliation, 1);
+	if (MLX5_CAP_GEN_2(master_mdev, sw_vhca_id_valid)) {
+		MLX5_SET(modify_nic_vport_context_in, in,
+			 nic_vport_context.vhca_id_type, VHCA_ID_TYPE_SW);
+		MLX5_SET(modify_nic_vport_context_in, in,
+			 nic_vport_context.affiliated_vhca_id,
+			 MLX5_CAP_GEN_2(master_mdev, sw_vhca_id));
+	} else {
 		MLX5_SET(modify_nic_vport_context_in, in,
 			 nic_vport_context.affiliated_vhca_id,
 			 MLX5_CAP_GEN(master_mdev, vhca_id));
+	}
 	MLX5_SET(modify_nic_vport_context_in, in,
 		 nic_vport_context.affiliation_criteria,
 		 MLX5_CAP_GEN(port_mdev, affiliate_nic_vport_criteria));

include/linux/mlx5/driver.h

@@ -610,6 +610,7 @@ struct mlx5_priv {
 	spinlock_t              ctx_lock;
 	struct mlx5_adev       **adev;
 	int			adev_idx;
+	int			sw_vhca_id;
 	struct mlx5_events      *events;
 
 	struct mlx5_flow_steering *steering;