drivers/net/ethernet/mellanox/mlx5/core/cq.c - linux - Git at Google

 /*
  * Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved.
  *
  * This software is available to you under a choice of one of two
  * licenses.  You may choose to be licensed under the terms of the GNU
  * General Public License (GPL) Version 2, available from the file
  * COPYING in the main directory of this source tree, or the
  * OpenIB.org BSD license below:
  *
  *     Redistribution and use in source and binary forms, with or
  *     without modification, are permitted provided that the following
  *     conditions are met:
  *
  *      - Redistributions of source code must retain the above
  *        copyright notice, this list of conditions and the following
  *        disclaimer.
  *
  *      - 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.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/hardirq.h>
 #include <linux/mlx5/driver.h>
 #include <linux/mlx5/cmd.h>
 #include <rdma/ib_verbs.h>
 #include <linux/mlx5/cq.h>
 #include "mlx5_core.h"

 #define TASKLET_MAX_TIME 2
 #define TASKLET_MAX_TIME_JIFFIES msecs_to_jiffies(TASKLET_MAX_TIME)

 void mlx5_cq_tasklet_cb(unsigned long data)
 {
 	unsigned long flags;
 	unsigned long end = jiffies + TASKLET_MAX_TIME_JIFFIES;
 	struct mlx5_eq_tasklet *ctx = (struct mlx5_eq_tasklet *)data;
 	struct mlx5_core_cq *mcq;
 	struct mlx5_core_cq *temp;

 	spin_lock_irqsave(&ctx->lock, flags);
 	list_splice_tail_init(&ctx->list, &ctx->process_list);
 	spin_unlock_irqrestore(&ctx->lock, flags);

 	list_for_each_entry_safe(mcq, temp, &ctx->process_list,
 				 tasklet_ctx.list) {
 		list_del_init(&mcq->tasklet_ctx.list);
 		mcq->tasklet_ctx.comp(mcq);
 		if (atomic_dec_and_test(&mcq->refcount))
 			complete(&mcq->free);
 		if (time_after(jiffies, end))
 			break;
 	}

 	if (!list_empty(&ctx->process_list))
 		tasklet_schedule(&ctx->task);
 }

 static void mlx5_add_cq_to_tasklet(struct mlx5_core_cq *cq)
 {
 	unsigned long flags;
 	struct mlx5_eq_tasklet *tasklet_ctx = cq->tasklet_ctx.priv;

 	spin_lock_irqsave(&tasklet_ctx->lock, flags);
 	/* When migrating CQs between EQs will be implemented, please note
 	 * that you need to sync this point. It is possible that
 	 * while migrating a CQ, completions on the old EQs could
 	 * still arrive.
 	 */
 	if (list_empty_careful(&cq->tasklet_ctx.list)) {
 		atomic_inc(&cq->refcount);
 		list_add_tail(&cq->tasklet_ctx.list, &tasklet_ctx->list);
 	}
 	spin_unlock_irqrestore(&tasklet_ctx->lock, flags);
 }

 void mlx5_cq_completion(struct mlx5_core_dev *dev, u32 cqn)
 {
 	struct mlx5_core_cq *cq;
 	struct mlx5_cq_table *table = &dev->priv.cq_table;

 	spin_lock(&table->lock);
 	cq = radix_tree_lookup(&table->tree, cqn);
 	if (likely(cq))
 		atomic_inc(&cq->refcount);
 	spin_unlock(&table->lock);

 	if (!cq) {
 		mlx5_core_warn(dev, "Completion event for bogus CQ 0x%x\n", cqn);
 		return;
 	}

 	++cq->arm_sn;

 	cq->comp(cq);

 	if (atomic_dec_and_test(&cq->refcount))
 		complete(&cq->free);
 }

 void mlx5_cq_event(struct mlx5_core_dev *dev, u32 cqn, int event_type)
 {
 	struct mlx5_cq_table *table = &dev->priv.cq_table;
 	struct mlx5_core_cq *cq;

 	spin_lock(&table->lock);

 	cq = radix_tree_lookup(&table->tree, cqn);
 	if (cq)
 		atomic_inc(&cq->refcount);

 	spin_unlock(&table->lock);

 	if (!cq) {
 		mlx5_core_warn(dev, "Async event for bogus CQ 0x%x\n", cqn);
 		return;
 	}

 	cq->event(cq, event_type);

 	if (atomic_dec_and_test(&cq->refcount))
 		complete(&cq->free);
 }

 int mlx5_core_create_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq,
 			u32 *in, int inlen)
 {
 	struct mlx5_cq_table *table = &dev->priv.cq_table;
 	u32 out[MLX5_ST_SZ_DW(create_cq_out)];
 	u32 din[MLX5_ST_SZ_DW(destroy_cq_in)];
 	u32 dout[MLX5_ST_SZ_DW(destroy_cq_out)];
 	int eqn = MLX5_GET(cqc, MLX5_ADDR_OF(create_cq_in, in, cq_context),
 			   c_eqn);
 	struct mlx5_eq *eq;
 	int err;

 	eq = mlx5_eqn2eq(dev, eqn);
 	if (IS_ERR(eq))
 		return PTR_ERR(eq);

 	memset(out, 0, sizeof(out));
 	MLX5_SET(create_cq_in, in, opcode, MLX5_CMD_OP_CREATE_CQ);
 	err = mlx5_cmd_exec(dev, in, inlen, out, sizeof(out));
 	if (err)
 		return err;

 	cq->cqn = MLX5_GET(create_cq_out, out, cqn);
 	cq->cons_index = 0;
 	cq->arm_sn     = 0;
 	atomic_set(&cq->refcount, 1);
 	init_completion(&cq->free);
 	if (!cq->comp)
 		cq->comp = mlx5_add_cq_to_tasklet;
 	/* assuming CQ will be deleted before the EQ */
 	cq->tasklet_ctx.priv = &eq->tasklet_ctx;
 	INIT_LIST_HEAD(&cq->tasklet_ctx.list);

 	spin_lock_irq(&table->lock);
 	err = radix_tree_insert(&table->tree, cq->cqn, cq);
 	spin_unlock_irq(&table->lock);
 	if (err)
 		goto err_cmd;

 	cq->pid = current->pid;
 	err = mlx5_debug_cq_add(dev, cq);
 	if (err)
 		mlx5_core_dbg(dev, "failed adding CP 0x%x to debug file system\n",
 			      cq->cqn);

 	return 0;

 err_cmd:
 	memset(din, 0, sizeof(din));
 	memset(dout, 0, sizeof(dout));
 	MLX5_SET(destroy_cq_in, din, opcode, MLX5_CMD_OP_DESTROY_CQ);
 	MLX5_SET(destroy_cq_in, din, cqn, cq->cqn);
 	mlx5_cmd_exec(dev, din, sizeof(din), dout, sizeof(dout));
 	return err;
 }
 EXPORT_SYMBOL(mlx5_core_create_cq);

 int mlx5_core_destroy_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq)
 {
 	struct mlx5_cq_table *table = &dev->priv.cq_table;
 	u32 out[MLX5_ST_SZ_DW(destroy_cq_out)] = {0};
 	u32 in[MLX5_ST_SZ_DW(destroy_cq_in)] = {0};
 	struct mlx5_core_cq *tmp;
 	int err;

 	spin_lock_irq(&table->lock);
 	tmp = radix_tree_delete(&table->tree, cq->cqn);
 	spin_unlock_irq(&table->lock);
 	if (!tmp) {
 		mlx5_core_warn(dev, "cq 0x%x not found in tree\n", cq->cqn);
 		return -EINVAL;
 	}
 	if (tmp != cq) {
 		mlx5_core_warn(dev, "corruption on srqn 0x%x\n", cq->cqn);
 		return -EINVAL;
 	}

 	MLX5_SET(destroy_cq_in, in, opcode, MLX5_CMD_OP_DESTROY_CQ);
 	MLX5_SET(destroy_cq_in, in, cqn, cq->cqn);
 	err = mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
 	if (err)
 		return err;

 	synchronize_irq(cq->irqn);

 	mlx5_debug_cq_remove(dev, cq);
 	if (atomic_dec_and_test(&cq->refcount))
 		complete(&cq->free);
 	wait_for_completion(&cq->free);

 	return 0;
 }
 EXPORT_SYMBOL(mlx5_core_destroy_cq);

 int mlx5_core_query_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq,
 		       u32 *out, int outlen)
 {
 	u32 in[MLX5_ST_SZ_DW(query_cq_in)] = {0};

 	MLX5_SET(query_cq_in, in, opcode, MLX5_CMD_OP_QUERY_CQ);
 	MLX5_SET(query_cq_in, in, cqn, cq->cqn);
 	return mlx5_cmd_exec(dev, in, sizeof(in), out, outlen);
 }
 EXPORT_SYMBOL(mlx5_core_query_cq);

 int mlx5_core_modify_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq,
 			u32 *in, int inlen)
 {
 	u32 out[MLX5_ST_SZ_DW(modify_cq_out)] = {0};

 	MLX5_SET(modify_cq_in, in, opcode, MLX5_CMD_OP_MODIFY_CQ);
 	return mlx5_cmd_exec(dev, in, inlen, out, sizeof(out));
 }
 EXPORT_SYMBOL(mlx5_core_modify_cq);

 int mlx5_core_modify_cq_moderation(struct mlx5_core_dev *dev,
 				   struct mlx5_core_cq *cq,
 				   u16 cq_period,
 				   u16 cq_max_count)
 {
 	u32 in[MLX5_ST_SZ_DW(modify_cq_in)] = {0};
 	void *cqc;

 	MLX5_SET(modify_cq_in, in, cqn, cq->cqn);
 	cqc = MLX5_ADDR_OF(modify_cq_in, in, cq_context);
 	MLX5_SET(cqc, cqc, cq_period, cq_period);
 	MLX5_SET(cqc, cqc, cq_max_count, cq_max_count);
 	MLX5_SET(modify_cq_in, in,
 		 modify_field_select_resize_field_select.modify_field_select.modify_field_select,
 		 MLX5_CQ_MODIFY_PERIOD | MLX5_CQ_MODIFY_COUNT);

 	return mlx5_core_modify_cq(dev, cq, in, sizeof(in));
 }
 EXPORT_SYMBOL(mlx5_core_modify_cq_moderation);

 int mlx5_init_cq_table(struct mlx5_core_dev *dev)
 {
 	struct mlx5_cq_table *table = &dev->priv.cq_table;
 	int err;

 	memset(table, 0, sizeof(*table));
 	spin_lock_init(&table->lock);
 	INIT_RADIX_TREE(&table->tree, GFP_ATOMIC);
 	err = mlx5_cq_debugfs_init(dev);

 	return err;
 }

 void mlx5_cleanup_cq_table(struct mlx5_core_dev *dev)
 {
 	mlx5_cq_debugfs_cleanup(dev);
 }
	/*
	* Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved.
	*
	* This software is available to you under a choice of one of two
	* licenses. You may choose to be licensed under the terms of the GNU
	* General Public License (GPL) Version 2, available from the file
	* COPYING in the main directory of this source tree, or the
	* OpenIB.org BSD license below:
	*
	* Redistribution and use in source and binary forms, with or
	* without modification, are permitted provided that the following
	* conditions are met:
	*
	* - Redistributions of source code must retain the above
	* copyright notice, this list of conditions and the following
	* disclaimer.
	*
	* - 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.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	* SOFTWARE.
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/hardirq.h>
	#include <linux/mlx5/driver.h>
	#include <linux/mlx5/cmd.h>
	#include <rdma/ib_verbs.h>
	#include <linux/mlx5/cq.h>
	#include "mlx5_core.h"

	#define TASKLET_MAX_TIME 2
	#define TASKLET_MAX_TIME_JIFFIES msecs_to_jiffies(TASKLET_MAX_TIME)

	void mlx5_cq_tasklet_cb(unsigned long data)
	{
	unsigned long flags;
	unsigned long end = jiffies + TASKLET_MAX_TIME_JIFFIES;
	struct mlx5_eq_tasklet ctx = (struct mlx5_eq_tasklet )data;
	struct mlx5_core_cq *mcq;
	struct mlx5_core_cq *temp;

	spin_lock_irqsave(&ctx->lock, flags);
	list_splice_tail_init(&ctx->list, &ctx->process_list);
	spin_unlock_irqrestore(&ctx->lock, flags);

	list_for_each_entry_safe(mcq, temp, &ctx->process_list,
	tasklet_ctx.list) {
	list_del_init(&mcq->tasklet_ctx.list);
	mcq->tasklet_ctx.comp(mcq);
	if (atomic_dec_and_test(&mcq->refcount))
	complete(&mcq->free);
	if (time_after(jiffies, end))
	break;
	}

	if (!list_empty(&ctx->process_list))
	tasklet_schedule(&ctx->task);
	}

	static void mlx5_add_cq_to_tasklet(struct mlx5_core_cq *cq)
	{
	unsigned long flags;
	struct mlx5_eq_tasklet *tasklet_ctx = cq->tasklet_ctx.priv;

	spin_lock_irqsave(&tasklet_ctx->lock, flags);
	/* When migrating CQs between EQs will be implemented, please note
	* that you need to sync this point. It is possible that
	* while migrating a CQ, completions on the old EQs could
	* still arrive.
	*/
	if (list_empty_careful(&cq->tasklet_ctx.list)) {
	atomic_inc(&cq->refcount);
	list_add_tail(&cq->tasklet_ctx.list, &tasklet_ctx->list);
	}
	spin_unlock_irqrestore(&tasklet_ctx->lock, flags);
	}

	void mlx5_cq_completion(struct mlx5_core_dev *dev, u32 cqn)
	{
	struct mlx5_core_cq *cq;
	struct mlx5_cq_table *table = &dev->priv.cq_table;

	spin_lock(&table->lock);
	cq = radix_tree_lookup(&table->tree, cqn);
	if (likely(cq))
	atomic_inc(&cq->refcount);
	spin_unlock(&table->lock);

	if (!cq) {
	mlx5_core_warn(dev, "Completion event for bogus CQ 0x%x\n", cqn);
	return;
	}

	++cq->arm_sn;

	cq->comp(cq);

	if (atomic_dec_and_test(&cq->refcount))
	complete(&cq->free);
	}

	void mlx5_cq_event(struct mlx5_core_dev *dev, u32 cqn, int event_type)
	{
	struct mlx5_cq_table *table = &dev->priv.cq_table;
	struct mlx5_core_cq *cq;

	spin_lock(&table->lock);

	cq = radix_tree_lookup(&table->tree, cqn);
	if (cq)
	atomic_inc(&cq->refcount);

	spin_unlock(&table->lock);

	if (!cq) {
	mlx5_core_warn(dev, "Async event for bogus CQ 0x%x\n", cqn);
	return;
	}

	cq->event(cq, event_type);

	if (atomic_dec_and_test(&cq->refcount))
	complete(&cq->free);
	}

	int mlx5_core_create_cq(struct mlx5_core_dev dev, struct mlx5_core_cq cq,
	u32 *in, int inlen)
	{
	struct mlx5_cq_table *table = &dev->priv.cq_table;
	u32 out[MLX5_ST_SZ_DW(create_cq_out)];
	u32 din[MLX5_ST_SZ_DW(destroy_cq_in)];
	u32 dout[MLX5_ST_SZ_DW(destroy_cq_out)];
	int eqn = MLX5_GET(cqc, MLX5_ADDR_OF(create_cq_in, in, cq_context),
	c_eqn);
	struct mlx5_eq *eq;
	int err;

	eq = mlx5_eqn2eq(dev, eqn);
	if (IS_ERR(eq))
	return PTR_ERR(eq);

	memset(out, 0, sizeof(out));
	MLX5_SET(create_cq_in, in, opcode, MLX5_CMD_OP_CREATE_CQ);
	err = mlx5_cmd_exec(dev, in, inlen, out, sizeof(out));
	if (err)
	return err;

	cq->cqn = MLX5_GET(create_cq_out, out, cqn);
	cq->cons_index = 0;
	cq->arm_sn = 0;
	atomic_set(&cq->refcount, 1);
	init_completion(&cq->free);
	if (!cq->comp)
	cq->comp = mlx5_add_cq_to_tasklet;
	/* assuming CQ will be deleted before the EQ */
	cq->tasklet_ctx.priv = &eq->tasklet_ctx;
	INIT_LIST_HEAD(&cq->tasklet_ctx.list);

	spin_lock_irq(&table->lock);
	err = radix_tree_insert(&table->tree, cq->cqn, cq);
	spin_unlock_irq(&table->lock);
	if (err)
	goto err_cmd;

	cq->pid = current->pid;
	err = mlx5_debug_cq_add(dev, cq);
	if (err)
	mlx5_core_dbg(dev, "failed adding CP 0x%x to debug file system\n",
	cq->cqn);

	return 0;

	err_cmd:
	memset(din, 0, sizeof(din));
	memset(dout, 0, sizeof(dout));
	MLX5_SET(destroy_cq_in, din, opcode, MLX5_CMD_OP_DESTROY_CQ);
	MLX5_SET(destroy_cq_in, din, cqn, cq->cqn);
	mlx5_cmd_exec(dev, din, sizeof(din), dout, sizeof(dout));
	return err;
	}
	EXPORT_SYMBOL(mlx5_core_create_cq);

	int mlx5_core_destroy_cq(struct mlx5_core_dev dev, struct mlx5_core_cq cq)
	{
	struct mlx5_cq_table *table = &dev->priv.cq_table;
	u32 out[MLX5_ST_SZ_DW(destroy_cq_out)] = {0};
	u32 in[MLX5_ST_SZ_DW(destroy_cq_in)] = {0};
	struct mlx5_core_cq *tmp;
	int err;

	spin_lock_irq(&table->lock);
	tmp = radix_tree_delete(&table->tree, cq->cqn);
	spin_unlock_irq(&table->lock);
	if (!tmp) {
	mlx5_core_warn(dev, "cq 0x%x not found in tree\n", cq->cqn);
	return -EINVAL;
	}
	if (tmp != cq) {
	mlx5_core_warn(dev, "corruption on srqn 0x%x\n", cq->cqn);
	return -EINVAL;
	}

	MLX5_SET(destroy_cq_in, in, opcode, MLX5_CMD_OP_DESTROY_CQ);
	MLX5_SET(destroy_cq_in, in, cqn, cq->cqn);
	err = mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
	if (err)
	return err;

	synchronize_irq(cq->irqn);

	mlx5_debug_cq_remove(dev, cq);
	if (atomic_dec_and_test(&cq->refcount))
	complete(&cq->free);
	wait_for_completion(&cq->free);

	return 0;
	}
	EXPORT_SYMBOL(mlx5_core_destroy_cq);

	int mlx5_core_query_cq(struct mlx5_core_dev dev, struct mlx5_core_cq cq,
	u32 *out, int outlen)
	{
	u32 in[MLX5_ST_SZ_DW(query_cq_in)] = {0};

	MLX5_SET(query_cq_in, in, opcode, MLX5_CMD_OP_QUERY_CQ);
	MLX5_SET(query_cq_in, in, cqn, cq->cqn);
	return mlx5_cmd_exec(dev, in, sizeof(in), out, outlen);
	}
	EXPORT_SYMBOL(mlx5_core_query_cq);

	int mlx5_core_modify_cq(struct mlx5_core_dev dev, struct mlx5_core_cq cq,
	u32 *in, int inlen)
	{
	u32 out[MLX5_ST_SZ_DW(modify_cq_out)] = {0};

	MLX5_SET(modify_cq_in, in, opcode, MLX5_CMD_OP_MODIFY_CQ);
	return mlx5_cmd_exec(dev, in, inlen, out, sizeof(out));
	}
	EXPORT_SYMBOL(mlx5_core_modify_cq);

	int mlx5_core_modify_cq_moderation(struct mlx5_core_dev *dev,
	struct mlx5_core_cq *cq,
	u16 cq_period,
	u16 cq_max_count)
	{
	u32 in[MLX5_ST_SZ_DW(modify_cq_in)] = {0};
	void *cqc;

	MLX5_SET(modify_cq_in, in, cqn, cq->cqn);
	cqc = MLX5_ADDR_OF(modify_cq_in, in, cq_context);
	MLX5_SET(cqc, cqc, cq_period, cq_period);
	MLX5_SET(cqc, cqc, cq_max_count, cq_max_count);
	MLX5_SET(modify_cq_in, in,
	modify_field_select_resize_field_select.modify_field_select.modify_field_select,
	MLX5_CQ_MODIFY_PERIOD \| MLX5_CQ_MODIFY_COUNT);

	return mlx5_core_modify_cq(dev, cq, in, sizeof(in));
	}
	EXPORT_SYMBOL(mlx5_core_modify_cq_moderation);

	int mlx5_init_cq_table(struct mlx5_core_dev *dev)
	{
	struct mlx5_cq_table *table = &dev->priv.cq_table;
	int err;

	memset(table, 0, sizeof(*table));
	spin_lock_init(&table->lock);
	INIT_RADIX_TREE(&table->tree, GFP_ATOMIC);
	err = mlx5_cq_debugfs_init(dev);

	return err;
	}

	void mlx5_cleanup_cq_table(struct mlx5_core_dev *dev)
	{
	mlx5_cq_debugfs_cleanup(dev);
	}