--- /dev/null
+/*
+ * drivers/net/ethernet/mellanox/mlxsw/spectrum_cnt.c
+ * Copyright (c) 2017 Mellanox Technologies. All rights reserved.
+ * Copyright (c) 2017 Arkadi Sharshevsky <arkadis@mellanox.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the names of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <linux/kernel.h>
+#include <linux/bitops.h>
+
+#include "spectrum_cnt.h"
+
+#define MLXSW_SP_COUNTER_POOL_BANK_SIZE 4096
+
+struct mlxsw_sp_counter_sub_pool {
+ unsigned int base_index;
+ unsigned int size;
+ unsigned int entry_size;
+ unsigned int bank_count;
+};
+
+struct mlxsw_sp_counter_pool {
+ unsigned int pool_size;
+ unsigned long *usage; /* Usage bitmap */
+ struct mlxsw_sp_counter_sub_pool *sub_pools;
+};
+
+static struct mlxsw_sp_counter_sub_pool mlxsw_sp_counter_sub_pools[] = {};
+
+static int mlxsw_sp_counter_pool_validate(struct mlxsw_sp *mlxsw_sp)
+{
+ unsigned int total_bank_config = 0;
+ unsigned int pool_size;
+ int i;
+
+ pool_size = MLXSW_CORE_RES_GET(mlxsw_sp->core, COUNTER_POOL_SIZE);
+ /* Check config is valid, no bank over subscription */
+ for (i = 0; i < ARRAY_SIZE(mlxsw_sp_counter_sub_pools); i++)
+ total_bank_config += mlxsw_sp_counter_sub_pools[i].bank_count;
+ if (total_bank_config > pool_size / MLXSW_SP_COUNTER_POOL_BANK_SIZE + 1)
+ return -EINVAL;
+ return 0;
+}
+
+int mlxsw_sp_counter_pool_init(struct mlxsw_sp *mlxsw_sp)
+{
+ struct mlxsw_sp_counter_sub_pool *sub_pool;
+ struct mlxsw_sp_counter_pool *pool;
+ unsigned int base_index;
+ unsigned int map_size;
+ int i;
+ int err;
+
+ if (!MLXSW_CORE_RES_VALID(mlxsw_sp->core, COUNTER_POOL_SIZE))
+ return -EIO;
+
+ err = mlxsw_sp_counter_pool_validate(mlxsw_sp);
+ if (err)
+ return err;
+
+ pool = kzalloc(sizeof(*pool), GFP_KERNEL);
+ if (!pool)
+ return -ENOMEM;
+
+ pool->pool_size = MLXSW_CORE_RES_GET(mlxsw_sp->core, COUNTER_POOL_SIZE);
+ map_size = BITS_TO_LONGS(pool->pool_size) * sizeof(unsigned long);
+
+ pool->usage = kzalloc(map_size, GFP_KERNEL);
+ if (!pool->usage) {
+ err = -ENOMEM;
+ goto err_usage_alloc;
+ }
+
+ pool->sub_pools = mlxsw_sp_counter_sub_pools;
+ /* Allocation is based on bank count which should be
+ * specified for each sub pool statically.
+ */
+ base_index = 0;
+ for (i = 0; i < ARRAY_SIZE(mlxsw_sp_counter_sub_pools); i++) {
+ sub_pool = &pool->sub_pools[i];
+ sub_pool->size = sub_pool->bank_count *
+ MLXSW_SP_COUNTER_POOL_BANK_SIZE;
+ sub_pool->base_index = base_index;
+ base_index += sub_pool->size;
+ /* The last bank can't be fully used */
+ if (sub_pool->base_index + sub_pool->size > pool->pool_size)
+ sub_pool->size = pool->pool_size - sub_pool->base_index;
+ }
+
+ mlxsw_sp->counter_pool = pool;
+ return 0;
+
+err_usage_alloc:
+ 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;
+
+ WARN_ON(find_first_bit(pool->usage, pool->pool_size) !=
+ pool->pool_size);
+ kfree(pool->usage);
+ 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;
+
+ sub_pool = &mlxsw_sp_counter_sub_pools[sub_pool_id];
+ stop_index = sub_pool->base_index + sub_pool->size;
+ entry_index = sub_pool->base_index;
+
+ entry_index = find_next_zero_bit(pool->usage, stop_index, entry_index);
+ if (entry_index == stop_index)
+ return -ENOBUFS;
+ /* 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)
+ return -ENOBUFS;
+ for (i = 0; i < sub_pool->entry_size; i++)
+ __set_bit(entry_index + i, pool->usage);
+
+ *p_counter_index = entry_index;
+ return 0;
+}
+
+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 = &mlxsw_sp_counter_sub_pools[sub_pool_id];
+ for (i = 0; i < sub_pool->entry_size; i++)
+ __clear_bit(counter_index + i, pool->usage);
+}
--- /dev/null
+/*
+ * drivers/net/ethernet/mellanox/mlxsw/spectrum_cnt.h
+ * Copyright (c) 2017 Mellanox Technologies. All rights reserved.
+ * Copyright (c) 2017 Arkadi Sharshevsky <arkdis@mellanox.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the names of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _MLXSW_SPECTRUM_CNT_H
+#define _MLXSW_SPECTRUM_CNT_H
+
+#include "spectrum.h"
+
+enum mlxsw_sp_counter_sub_pool_id {
+ /* Placeholder before first pool registered */
+ MLXSW_SP_COUNTER_SUB_POOL_PLACEHOLDER,
+};
+
+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);
+void mlxsw_sp_counter_free(struct mlxsw_sp *mlxsw_sp,
+ enum mlxsw_sp_counter_sub_pool_id sub_pool_id,
+ unsigned int counter_index);
+int mlxsw_sp_counter_pool_init(struct mlxsw_sp *mlxsw_sp);
+void mlxsw_sp_counter_pool_fini(struct mlxsw_sp *mlxsw_sp);
+
+#endif
projects / karo-tx-linux.git / commitdiff