1 files changed, 380 insertions, 0 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/sf/dev/dev.c b/drivers/net/ethernet/mellanox/mlx5/core/sf/dev/dev.c
new file mode 100644
index 000000000..8e2abbab0
--- /dev/null
+++ b/drivers/net/ethernet/mellanox/mlx5/core/sf/dev/dev.c
@@ -0,0 +1,380 @@
+// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+/* Copyright (c) 2020 Mellanox Technologies Ltd */
+
+#include <linux/mlx5/driver.h>
+#include <linux/mlx5/device.h>
+#include "mlx5_core.h"
+#include "dev.h"
+#include "sf/vhca_event.h"
+#include "sf/sf.h"
+#include "sf/mlx5_ifc_vhca_event.h"
+#include "ecpf.h"
+#define CREATE_TRACE_POINTS
+#include "diag/dev_tracepoint.h"
+
+struct mlx5_sf_dev_table {
+	struct xarray devices;
+	unsigned int max_sfs;
+	phys_addr_t base_address;
+	u64 sf_bar_length;
+	struct notifier_block nb;
+	struct mutex table_lock; /* Serializes sf life cycle and vhca state change handler */
+	struct workqueue_struct *active_wq;
+	struct work_struct work;
+	u8 stop_active_wq:1;
+	struct mlx5_core_dev *dev;
+};
+
+static bool mlx5_sf_dev_supported(const struct mlx5_core_dev *dev)
+{
+	return MLX5_CAP_GEN(dev, sf) && mlx5_vhca_event_supported(dev);
+}
+
+bool mlx5_sf_dev_allocated(const struct mlx5_core_dev *dev)
+{
+	struct mlx5_sf_dev_table *table = dev->priv.sf_dev_table;
+
+	return table && !xa_empty(&table->devices);
+}
+
+static ssize_t sfnum_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct auxiliary_device *adev = container_of(dev, struct auxiliary_device, dev);
+	struct mlx5_sf_dev *sf_dev = container_of(adev, struct mlx5_sf_dev, adev);
+
+	return sysfs_emit(buf, "%u\n", sf_dev->sfnum);
+}
+static DEVICE_ATTR_RO(sfnum);
+
+static struct attribute *sf_device_attrs[] = {
+	&dev_attr_sfnum.attr,
+	NULL,
+};
+
+static const struct attribute_group sf_attr_group = {
+	.attrs = sf_device_attrs,
+};
+
+static const struct attribute_group *sf_attr_groups[2] = {
+	&sf_attr_group,
+	NULL
+};
+
+static void mlx5_sf_dev_release(struct device *device)
+{
+	struct auxiliary_device *adev = container_of(device, struct auxiliary_device, dev);
+	struct mlx5_sf_dev *sf_dev = container_of(adev, struct mlx5_sf_dev, adev);
+
+	mlx5_adev_idx_free(adev->id);
+	kfree(sf_dev);
+}
+
+static void mlx5_sf_dev_remove(struct mlx5_core_dev *dev, struct mlx5_sf_dev *sf_dev)
+{
+	int id;
+
+	id = sf_dev->adev.id;
+	trace_mlx5_sf_dev_del(dev, sf_dev, id);
+
+	auxiliary_device_delete(&sf_dev->adev);
+	auxiliary_device_uninit(&sf_dev->adev);
+}
+
+static void mlx5_sf_dev_add(struct mlx5_core_dev *dev, u16 sf_index, u16 fn_id, u32 sfnum)
+{
+	struct mlx5_sf_dev_table *table = dev->priv.sf_dev_table;
+	struct mlx5_sf_dev *sf_dev;
+	struct pci_dev *pdev;
+	int err;
+	int id;
+
+	id = mlx5_adev_idx_alloc();
+	if (id < 0) {
+		err = id;
+		goto add_err;
+	}
+
+	sf_dev = kzalloc(sizeof(*sf_dev), GFP_KERNEL);
+	if (!sf_dev) {
+		mlx5_adev_idx_free(id);
+		err = -ENOMEM;
+		goto add_err;
+	}
+	pdev = dev->pdev;
+	sf_dev->adev.id = id;
+	sf_dev->adev.name = MLX5_SF_DEV_ID_NAME;
+	sf_dev->adev.dev.release = mlx5_sf_dev_release;
+	sf_dev->adev.dev.parent = &pdev->dev;
+	sf_dev->adev.dev.groups = sf_attr_groups;
+	sf_dev->sfnum = sfnum;
+	sf_dev->parent_mdev = dev;
+	sf_dev->fn_id = fn_id;
+
+	if (!table->max_sfs) {
+		mlx5_adev_idx_free(id);
+		kfree(sf_dev);
+		err = -EOPNOTSUPP;
+		goto add_err;
+	}
+	sf_dev->bar_base_addr = table->base_address + (sf_index * table->sf_bar_length);
+
+	trace_mlx5_sf_dev_add(dev, sf_dev, id);
+
+	err = auxiliary_device_init(&sf_dev->adev);
+	if (err) {
+		mlx5_adev_idx_free(id);
+		kfree(sf_dev);
+		goto add_err;
+	}
+
+	err = auxiliary_device_add(&sf_dev->adev);
+	if (err) {
+		put_device(&sf_dev->adev.dev);
+		goto add_err;
+	}
+
+	err = xa_insert(&table->devices, sf_index, sf_dev, GFP_KERNEL);
+	if (err)
+		goto xa_err;
+	return;
+
+xa_err:
+	mlx5_sf_dev_remove(dev, sf_dev);
+add_err:
+	mlx5_core_err(dev, "SF DEV: fail device add for index=%d sfnum=%d err=%d\n",
+		      sf_index, sfnum, err);
+}
+
+static void mlx5_sf_dev_del(struct mlx5_core_dev *dev, struct mlx5_sf_dev *sf_dev, u16 sf_index)
+{
+	struct mlx5_sf_dev_table *table = dev->priv.sf_dev_table;
+
+	xa_erase(&table->devices, sf_index);
+	mlx5_sf_dev_remove(dev, sf_dev);
+}
+
+static int
+mlx5_sf_dev_state_change_handler(struct notifier_block *nb, unsigned long event_code, void *data)
+{
+	struct mlx5_sf_dev_table *table = container_of(nb, struct mlx5_sf_dev_table, nb);
+	const struct mlx5_vhca_state_event *event = data;
+	struct mlx5_sf_dev *sf_dev;
+	u16 max_functions;
+	u16 sf_index;
+	u16 base_id;
+
+	max_functions = mlx5_sf_max_functions(table->dev);
+	if (!max_functions)
+		return 0;
+
+	base_id = MLX5_CAP_GEN(table->dev, sf_base_id);
+	if (event->function_id < base_id || event->function_id >= (base_id + max_functions))
+		return 0;
+
+	sf_index = event->function_id - base_id;
+	mutex_lock(&table->table_lock);
+	sf_dev = xa_load(&table->devices, sf_index);
+	switch (event->new_vhca_state) {
+	case MLX5_VHCA_STATE_INVALID:
+	case MLX5_VHCA_STATE_ALLOCATED:
+		if (sf_dev)
+			mlx5_sf_dev_del(table->dev, sf_dev, sf_index);
+		break;
+	case MLX5_VHCA_STATE_TEARDOWN_REQUEST:
+		if (sf_dev)
+			mlx5_sf_dev_del(table->dev, sf_dev, sf_index);
+		else
+			mlx5_core_err(table->dev,
+				      "SF DEV: teardown state for invalid dev index=%d fn_id=0x%x\n",
+				      sf_index, event->sw_function_id);
+		break;
+	case MLX5_VHCA_STATE_ACTIVE:
+		if (!sf_dev)
+			mlx5_sf_dev_add(table->dev, sf_index, event->function_id,
+					event->sw_function_id);
+		break;
+	default:
+		break;
+	}
+	mutex_unlock(&table->table_lock);
+	return 0;
+}
+
+static int mlx5_sf_dev_vhca_arm_all(struct mlx5_sf_dev_table *table)
+{
+	struct mlx5_core_dev *dev = table->dev;
+	u16 max_functions;
+	u16 function_id;
+	int err = 0;
+	int i;
+
+	max_functions = mlx5_sf_max_functions(dev);
+	function_id = MLX5_CAP_GEN(dev, sf_base_id);
+	/* Arm the vhca context as the vhca event notifier */
+	for (i = 0; i < max_functions; i++) {
+		err = mlx5_vhca_event_arm(dev, function_id);
+		if (err)
+			return err;
+
+		function_id++;
+	}
+	return 0;
+}
+
+static void mlx5_sf_dev_add_active_work(struct work_struct *work)
+{
+	struct mlx5_sf_dev_table *table = container_of(work, struct mlx5_sf_dev_table, work);
+	u32 out[MLX5_ST_SZ_DW(query_vhca_state_out)] = {};
+	struct mlx5_core_dev *dev = table->dev;
+	u16 max_functions;
+	u16 function_id;
+	u16 sw_func_id;
+	int err = 0;
+	u8 state;
+	int i;
+
+	max_functions = mlx5_sf_max_functions(dev);
+	function_id = MLX5_CAP_GEN(dev, sf_base_id);
+	for (i = 0; i < max_functions; i++, function_id++) {
+		if (table->stop_active_wq)
+			return;
+		err = mlx5_cmd_query_vhca_state(dev, function_id, out, sizeof(out));
+		if (err)
+			/* A failure of specific vhca doesn't mean others will
+			 * fail as well.
+			 */
+			continue;
+		state = MLX5_GET(query_vhca_state_out, out, vhca_state_context.vhca_state);
+		if (state != MLX5_VHCA_STATE_ACTIVE)
+			continue;
+
+		sw_func_id = MLX5_GET(query_vhca_state_out, out, vhca_state_context.sw_function_id);
+		mutex_lock(&table->table_lock);
+		/* Don't probe device which is already probe */
+		if (!xa_load(&table->devices, i))
+			mlx5_sf_dev_add(dev, i, function_id, sw_func_id);
+		/* There is a race where SF got inactive after the query
+		 * above. e.g.: the query returns that the state of the
+		 * SF is active, and after that the eswitch manager set it to
+		 * inactive.
+		 * This case cannot be managed in SW, since the probing of the
+		 * SF is on one system, and the inactivation is on a different
+		 * system.
+		 * If the inactive is done after the SF perform init_hca(),
+		 * the SF will fully probe and then removed. If it was
+		 * done before init_hca(), the SF probe will fail.
+		 */
+		mutex_unlock(&table->table_lock);
+	}
+}
+
+/* In case SFs are generated externally, probe active SFs */
+static int mlx5_sf_dev_queue_active_work(struct mlx5_sf_dev_table *table)
+{
+	if (MLX5_CAP_GEN(table->dev, eswitch_manager))
+		return 0; /* the table is local */
+
+	/* Use a workqueue to probe active SFs, which are in large
+	 * quantity and may take up to minutes to probe.
+	 */
+	table->active_wq = create_singlethread_workqueue("mlx5_active_sf");
+	if (!table->active_wq)
+		return -ENOMEM;
+	INIT_WORK(&table->work, &mlx5_sf_dev_add_active_work);
+	queue_work(table->active_wq, &table->work);
+	return 0;
+}
+
+static void mlx5_sf_dev_destroy_active_work(struct mlx5_sf_dev_table *table)
+{
+	if (table->active_wq) {
+		table->stop_active_wq = true;
+		destroy_workqueue(table->active_wq);
+	}
+}
+
+void mlx5_sf_dev_table_create(struct mlx5_core_dev *dev)
+{
+	struct mlx5_sf_dev_table *table;
+	unsigned int max_sfs;
+	int err;
+
+	if (!mlx5_sf_dev_supported(dev) || !mlx5_vhca_event_supported(dev))
+		return;
+
+	table = kzalloc(sizeof(*table), GFP_KERNEL);
+	if (!table) {
+		err = -ENOMEM;
+		goto table_err;
+	}
+
+	table->nb.notifier_call = mlx5_sf_dev_state_change_handler;
+	table->dev = dev;
+	if (MLX5_CAP_GEN(dev, max_num_sf))
+		max_sfs = MLX5_CAP_GEN(dev, max_num_sf);
+	else
+		max_sfs = 1 << MLX5_CAP_GEN(dev, log_max_sf);
+	table->sf_bar_length = 1 << (MLX5_CAP_GEN(dev, log_min_sf_size) + 12);
+	table->base_address = pci_resource_start(dev->pdev, 2);
+	table->max_sfs = max_sfs;
+	xa_init(&table->devices);
+	mutex_init(&table->table_lock);
+	dev->priv.sf_dev_table = table;
+
+	err = mlx5_vhca_event_notifier_register(dev, &table->nb);
+	if (err)
+		goto vhca_err;
+
+	err = mlx5_sf_dev_queue_active_work(table);
+	if (err)
+		goto add_active_err;
+
+	err = mlx5_sf_dev_vhca_arm_all(table);
+	if (err)
+		goto arm_err;
+	mlx5_core_dbg(dev, "SF DEV: max sf devices=%d\n", max_sfs);
+	return;
+
+arm_err:
+	mlx5_sf_dev_destroy_active_work(table);
+add_active_err:
+	mlx5_vhca_event_notifier_unregister(dev, &table->nb);
+vhca_err:
+	table->max_sfs = 0;
+	kfree(table);
+	dev->priv.sf_dev_table = NULL;
+table_err:
+	mlx5_core_err(dev, "SF DEV table create err = %d\n", err);
+}
+
+static void mlx5_sf_dev_destroy_all(struct mlx5_sf_dev_table *table)
+{
+	struct mlx5_sf_dev *sf_dev;
+	unsigned long index;
+
+	xa_for_each(&table->devices, index, sf_dev) {
+		xa_erase(&table->devices, index);
+		mlx5_sf_dev_remove(table->dev, sf_dev);
+	}
+}
+
+void mlx5_sf_dev_table_destroy(struct mlx5_core_dev *dev)
+{
+	struct mlx5_sf_dev_table *table = dev->priv.sf_dev_table;
+
+	if (!table)
+		return;
+
+	mlx5_sf_dev_destroy_active_work(table);
+	mlx5_vhca_event_notifier_unregister(dev, &table->nb);
+	mutex_destroy(&table->table_lock);
+
+	/* Now that event handler is not running, it is safe to destroy
+	 * the sf device without race.
+	 */
+	mlx5_sf_dev_destroy_all(table);
+
+	WARN_ON(!xa_empty(&table->devices));
+	kfree(table);
+	dev->priv.sf_dev_table = NULL;
+}