1 files changed, 306 insertions, 0 deletions
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_cnt.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_cnt.c
new file mode 100644
index 000000000..ee59c7915
--- /dev/null
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_cnt.c
@@ -0,0 +1,306 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+/* Copyright (c) 2017-2018 Mellanox Technologies. All rights reserved */
+
+#include <linux/kernel.h>
+#include <linux/bitops.h>
+#include <linux/spinlock.h>
+
+#include "spectrum_cnt.h"
+
+struct mlxsw_sp_counter_sub_pool {
+	u64 size;
+	unsigned int base_index;
+	enum mlxsw_res_id entry_size_res_id;
+	const char *resource_name; /* devlink resource name */
+	u64 resource_id; /* devlink resource id */
+	unsigned int entry_size;
+	unsigned int bank_count;
+	atomic_t active_entries_count;
+};
+
+struct mlxsw_sp_counter_pool {
+	u64 pool_size;
+	unsigned long *usage; /* Usage bitmap */
+	spinlock_t counter_pool_lock; /* Protects counter pool allocations */
+	atomic_t active_entries_count;
+	unsigned int sub_pools_count;
+	struct mlxsw_sp_counter_sub_pool sub_pools[];
+};
+
+static const struct mlxsw_sp_counter_sub_pool mlxsw_sp_counter_sub_pools[] = {
+	[MLXSW_SP_COUNTER_SUB_POOL_FLOW] = {
+		.entry_size_res_id = MLXSW_RES_ID_COUNTER_SIZE_PACKETS_BYTES,
+		.resource_name = MLXSW_SP_RESOURCE_NAME_COUNTERS_FLOW,
+		.resource_id = MLXSW_SP_RESOURCE_COUNTERS_FLOW,
+		.bank_count = 6,
+	},
+	[MLXSW_SP_COUNTER_SUB_POOL_RIF] = {
+		.entry_size_res_id = MLXSW_RES_ID_COUNTER_SIZE_ROUTER_BASIC,
+		.resource_name = MLXSW_SP_RESOURCE_NAME_COUNTERS_RIF,
+		.resource_id = MLXSW_SP_RESOURCE_COUNTERS_RIF,
+		.bank_count = 2,
+	}
+};
+
+static u64 mlxsw_sp_counter_sub_pool_occ_get(void *priv)
+{
+	const struct mlxsw_sp_counter_sub_pool *sub_pool = priv;
+
+	return atomic_read(&sub_pool->active_entries_count);
+}
+
+static int mlxsw_sp_counter_sub_pools_init(struct mlxsw_sp *mlxsw_sp)
+{
+	struct mlxsw_sp_counter_pool *pool = mlxsw_sp->counter_pool;
+	struct devlink *devlink = priv_to_devlink(mlxsw_sp->core);
+	struct mlxsw_sp_counter_sub_pool *sub_pool;
+	unsigned int base_index = 0;
+	enum mlxsw_res_id res_id;
+	int err;
+	int i;
+
+	for (i = 0; i < pool->sub_pools_count; i++) {
+		sub_pool = &pool->sub_pools[i];
+		res_id = sub_pool->entry_size_res_id;
+
+		if (!mlxsw_core_res_valid(mlxsw_sp->core, res_id))
+			return -EIO;
+		sub_pool->entry_size = mlxsw_core_res_get(mlxsw_sp->core,
+							  res_id);
+		err = devl_resource_size_get(devlink,
+					     sub_pool->resource_id,
+					     &sub_pool->size);
+		if (err)
+			goto err_resource_size_get;
+
+		devl_resource_occ_get_register(devlink,
+					       sub_pool->resource_id,
+					       mlxsw_sp_counter_sub_pool_occ_get,
+					       sub_pool);
+
+		sub_pool->base_index = base_index;
+		base_index += sub_pool->size;
+		atomic_set(&sub_pool->active_entries_count, 0);
+	}
+	return 0;
+
+err_resource_size_get:
+	for (i--; i >= 0; i--) {
+		sub_pool = &pool->sub_pools[i];
+
+		devl_resource_occ_get_unregister(devlink,
+						 sub_pool->resource_id);
+	}
+	return err;
+}
+
+static void mlxsw_sp_counter_sub_pools_fini(struct mlxsw_sp *mlxsw_sp)
+{
+	struct mlxsw_sp_counter_pool *pool = mlxsw_sp->counter_pool;
+	struct devlink *devlink = priv_to_devlink(mlxsw_sp->core);
+	struct mlxsw_sp_counter_sub_pool *sub_pool;
+	int i;
+
+	for (i = 0; i < pool->sub_pools_count; i++) {
+		sub_pool = &pool->sub_pools[i];
+
+		WARN_ON(atomic_read(&sub_pool->active_entries_count));
+		devl_resource_occ_get_unregister(devlink,
+						 sub_pool->resource_id);
+	}
+}
+
+static u64 mlxsw_sp_counter_pool_occ_get(void *priv)
+{
+	const struct mlxsw_sp_counter_pool *pool = priv;
+
+	return atomic_read(&pool->active_entries_count);
+}
+
+int mlxsw_sp_counter_pool_init(struct mlxsw_sp *mlxsw_sp)
+{
+	unsigned int sub_pools_count = ARRAY_SIZE(mlxsw_sp_counter_sub_pools);
+	struct devlink *devlink = priv_to_devlink(mlxsw_sp->core);
+	struct mlxsw_sp_counter_pool *pool;
+	int err;
+
+	pool = kzalloc(struct_size(pool, sub_pools, sub_pools_count),
+		       GFP_KERNEL);
+	if (!pool)
+		return -ENOMEM;
+	mlxsw_sp->counter_pool = pool;
+	pool->sub_pools_count = sub_pools_count;
+	memcpy(pool->sub_pools, mlxsw_sp_counter_sub_pools,
+	       flex_array_size(pool, sub_pools, pool->sub_pools_count));
+	spin_lock_init(&pool->counter_pool_lock);
+	atomic_set(&pool->active_entries_count, 0);
+
+	err = devl_resource_size_get(devlink, MLXSW_SP_RESOURCE_COUNTERS,
+				     &pool->pool_size);
+	if (err)
+		goto err_pool_resource_size_get;
+	devl_resource_occ_get_register(devlink, MLXSW_SP_RESOURCE_COUNTERS,
+				       mlxsw_sp_counter_pool_occ_get, pool);
+
+	pool->usage = bitmap_zalloc(pool->pool_size, GFP_KERNEL);
+	if (!pool->usage) {
+		err = -ENOMEM;
+		goto err_usage_alloc;
+	}
+
+	err = mlxsw_sp_counter_sub_pools_init(mlxsw_sp);
+	if (err)
+		goto err_sub_pools_init;
+
+	return 0;
+
+err_sub_pools_init:
+	bitmap_free(pool->usage);
+err_usage_alloc:
+	devl_resource_occ_get_unregister(devlink,
+					 MLXSW_SP_RESOURCE_COUNTERS);
+err_pool_resource_size_get:
+	kfree(pool);
+	return err;
+}
+
+void mlxsw_sp_counter_pool_fini(struct mlxsw_sp *mlxsw_sp)
+{
+	struct mlxsw_sp_counter_pool *pool = mlxsw_sp->counter_pool;
+	struct devlink *devlink = priv_to_devlink(mlxsw_sp->core);
+
+	mlxsw_sp_counter_sub_pools_fini(mlxsw_sp);
+	WARN_ON(find_first_bit(pool->usage, pool->pool_size) !=
+			       pool->pool_size);
+	WARN_ON(atomic_read(&pool->active_entries_count));
+	bitmap_free(pool->usage);
+	devl_resource_occ_get_unregister(devlink,
+					 MLXSW_SP_RESOURCE_COUNTERS);
+	kfree(pool);
+}
+
+int mlxsw_sp_counter_alloc(struct mlxsw_sp *mlxsw_sp,
+			   enum mlxsw_sp_counter_sub_pool_id sub_pool_id,
+			   unsigned int *p_counter_index)
+{
+	struct mlxsw_sp_counter_pool *pool = mlxsw_sp->counter_pool;
+	struct mlxsw_sp_counter_sub_pool *sub_pool;
+	unsigned int entry_index;
+	unsigned int stop_index;
+	int i, err;
+
+	sub_pool = &pool->sub_pools[sub_pool_id];
+	stop_index = sub_pool->base_index + sub_pool->size;
+	entry_index = sub_pool->base_index;
+
+	spin_lock(&pool->counter_pool_lock);
+	entry_index = find_next_zero_bit(pool->usage, stop_index, entry_index);
+	if (entry_index == stop_index) {
+		err = -ENOBUFS;
+		goto err_alloc;
+	}
+	/* The sub-pools can contain non-integer number of entries
+	 * so we must check for overflow
+	 */
+	if (entry_index + sub_pool->entry_size > stop_index) {
+		err = -ENOBUFS;
+		goto err_alloc;
+	}
+	for (i = 0; i < sub_pool->entry_size; i++)
+		__set_bit(entry_index + i, pool->usage);
+	spin_unlock(&pool->counter_pool_lock);
+
+	*p_counter_index = entry_index;
+	atomic_add(sub_pool->entry_size, &sub_pool->active_entries_count);
+	atomic_add(sub_pool->entry_size, &pool->active_entries_count);
+	return 0;
+
+err_alloc:
+	spin_unlock(&pool->counter_pool_lock);
+	return err;
+}
+
+void mlxsw_sp_counter_free(struct mlxsw_sp *mlxsw_sp,
+			   enum mlxsw_sp_counter_sub_pool_id sub_pool_id,
+			   unsigned int counter_index)
+{
+	struct mlxsw_sp_counter_pool *pool = mlxsw_sp->counter_pool;
+	struct mlxsw_sp_counter_sub_pool *sub_pool;
+	int i;
+
+	if (WARN_ON(counter_index >= pool->pool_size))
+		return;
+	sub_pool = &pool->sub_pools[sub_pool_id];
+	spin_lock(&pool->counter_pool_lock);
+	for (i = 0; i < sub_pool->entry_size; i++)
+		__clear_bit(counter_index + i, pool->usage);
+	spin_unlock(&pool->counter_pool_lock);
+	atomic_sub(sub_pool->entry_size, &sub_pool->active_entries_count);
+	atomic_sub(sub_pool->entry_size, &pool->active_entries_count);
+}
+
+int mlxsw_sp_counter_resources_register(struct mlxsw_core *mlxsw_core)
+{
+	static struct devlink_resource_size_params size_params;
+	struct devlink *devlink = priv_to_devlink(mlxsw_core);
+	const struct mlxsw_sp_counter_sub_pool *sub_pool;
+	unsigned int total_bank_config;
+	u64 sub_pool_size;
+	u64 base_index;
+	u64 pool_size;
+	u64 bank_size;
+	int err;
+	int i;
+
+	if (!MLXSW_CORE_RES_VALID(mlxsw_core, COUNTER_POOL_SIZE) ||
+	    !MLXSW_CORE_RES_VALID(mlxsw_core, COUNTER_BANK_SIZE))
+		return -EIO;
+
+	pool_size = MLXSW_CORE_RES_GET(mlxsw_core, COUNTER_POOL_SIZE);
+	bank_size = MLXSW_CORE_RES_GET(mlxsw_core, COUNTER_BANK_SIZE);
+
+	devlink_resource_size_params_init(&size_params, pool_size,
+					  pool_size, bank_size,
+					  DEVLINK_RESOURCE_UNIT_ENTRY);
+	err = devl_resource_register(devlink,
+				     MLXSW_SP_RESOURCE_NAME_COUNTERS,
+				     pool_size,
+				     MLXSW_SP_RESOURCE_COUNTERS,
+				     DEVLINK_RESOURCE_ID_PARENT_TOP,
+				     &size_params);
+	if (err)
+		return err;
+
+	/* Allocation is based on bank count which should be
+	 * specified for each sub pool statically.
+	 */
+	total_bank_config = 0;
+	base_index = 0;
+	for (i = 0; i < ARRAY_SIZE(mlxsw_sp_counter_sub_pools); i++) {
+		sub_pool = &mlxsw_sp_counter_sub_pools[i];
+		sub_pool_size = sub_pool->bank_count * bank_size;
+		/* The last bank can't be fully used */
+		if (base_index + sub_pool_size > pool_size)
+			sub_pool_size = pool_size - base_index;
+		base_index += sub_pool_size;
+
+		devlink_resource_size_params_init(&size_params, sub_pool_size,
+						  sub_pool_size, bank_size,
+						  DEVLINK_RESOURCE_UNIT_ENTRY);
+		err = devl_resource_register(devlink,
+					     sub_pool->resource_name,
+					     sub_pool_size,
+					     sub_pool->resource_id,
+					     MLXSW_SP_RESOURCE_COUNTERS,
+					     &size_params);
+		if (err)
+			return err;
+		total_bank_config += sub_pool->bank_count;
+	}
+
+	/* Check config is valid, no bank over subscription */
+	if (WARN_ON(total_bank_config > div64_u64(pool_size, bank_size) + 1))
+		return -EINVAL;
+
+	return 0;
+}