/*
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* Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/hardirq.h>
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#include <linux/mlx5/driver.h>
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#include <rdma/ib_verbs.h>
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#include <linux/mlx5/cq.h>
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#include "mlx5_core.h"
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#include "lib/eq.h"
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#define TASKLET_MAX_TIME 2
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#define TASKLET_MAX_TIME_JIFFIES msecs_to_jiffies(TASKLET_MAX_TIME)
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void mlx5_cq_tasklet_cb(struct tasklet_struct *t)
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{
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unsigned long flags;
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unsigned long end = jiffies + TASKLET_MAX_TIME_JIFFIES;
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struct mlx5_eq_tasklet *ctx = from_tasklet(ctx, t, task);
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struct mlx5_core_cq *mcq;
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struct mlx5_core_cq *temp;
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spin_lock_irqsave(&ctx->lock, flags);
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list_splice_tail_init(&ctx->list, &ctx->process_list);
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spin_unlock_irqrestore(&ctx->lock, flags);
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list_for_each_entry_safe(mcq, temp, &ctx->process_list,
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tasklet_ctx.list) {
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list_del_init(&mcq->tasklet_ctx.list);
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mcq->tasklet_ctx.comp(mcq, NULL);
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mlx5_cq_put(mcq);
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if (time_after(jiffies, end))
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break;
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}
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if (!list_empty(&ctx->process_list))
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tasklet_schedule(&ctx->task);
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}
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static void mlx5_add_cq_to_tasklet(struct mlx5_core_cq *cq,
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struct mlx5_eqe *eqe)
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{
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unsigned long flags;
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struct mlx5_eq_tasklet *tasklet_ctx = cq->tasklet_ctx.priv;
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spin_lock_irqsave(&tasklet_ctx->lock, flags);
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/* When migrating CQs between EQs will be implemented, please note
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* that you need to sync this point. It is possible that
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* while migrating a CQ, completions on the old EQs could
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* still arrive.
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*/
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if (list_empty_careful(&cq->tasklet_ctx.list)) {
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mlx5_cq_hold(cq);
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list_add_tail(&cq->tasklet_ctx.list, &tasklet_ctx->list);
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}
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spin_unlock_irqrestore(&tasklet_ctx->lock, flags);
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}
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int mlx5_core_create_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq,
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u32 *in, int inlen, u32 *out, int outlen)
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{
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int eqn = MLX5_GET(cqc, MLX5_ADDR_OF(create_cq_in, in, cq_context), c_eqn);
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u32 din[MLX5_ST_SZ_DW(destroy_cq_in)] = {};
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struct mlx5_eq_comp *eq;
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int err;
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eq = mlx5_eqn2comp_eq(dev, eqn);
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if (IS_ERR(eq))
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return PTR_ERR(eq);
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memset(out, 0, outlen);
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MLX5_SET(create_cq_in, in, opcode, MLX5_CMD_OP_CREATE_CQ);
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err = mlx5_cmd_exec(dev, in, inlen, out, outlen);
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if (err)
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return err;
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cq->cqn = MLX5_GET(create_cq_out, out, cqn);
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cq->cons_index = 0;
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cq->arm_sn = 0;
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cq->eq = eq;
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cq->uid = MLX5_GET(create_cq_in, in, uid);
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refcount_set(&cq->refcount, 1);
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init_completion(&cq->free);
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if (!cq->comp)
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cq->comp = mlx5_add_cq_to_tasklet;
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/* assuming CQ will be deleted before the EQ */
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cq->tasklet_ctx.priv = &eq->tasklet_ctx;
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INIT_LIST_HEAD(&cq->tasklet_ctx.list);
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/* Add to comp EQ CQ tree to recv comp events */
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err = mlx5_eq_add_cq(&eq->core, cq);
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if (err)
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goto err_cmd;
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/* Add to async EQ CQ tree to recv async events */
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err = mlx5_eq_add_cq(mlx5_get_async_eq(dev), cq);
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if (err)
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goto err_cq_add;
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cq->pid = current->pid;
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err = mlx5_debug_cq_add(dev, cq);
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if (err)
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mlx5_core_dbg(dev, "failed adding CP 0x%x to debug file system\n",
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cq->cqn);
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cq->uar = dev->priv.uar;
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cq->irqn = eq->core.irqn;
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return 0;
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err_cq_add:
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mlx5_eq_del_cq(&eq->core, cq);
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err_cmd:
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MLX5_SET(destroy_cq_in, din, opcode, MLX5_CMD_OP_DESTROY_CQ);
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MLX5_SET(destroy_cq_in, din, cqn, cq->cqn);
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MLX5_SET(destroy_cq_in, din, uid, cq->uid);
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mlx5_cmd_exec_in(dev, destroy_cq, din);
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return err;
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}
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EXPORT_SYMBOL(mlx5_core_create_cq);
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int mlx5_core_destroy_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq)
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{
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u32 in[MLX5_ST_SZ_DW(destroy_cq_in)] = {};
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int err;
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mlx5_debug_cq_remove(dev, cq);
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mlx5_eq_del_cq(mlx5_get_async_eq(dev), cq);
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mlx5_eq_del_cq(&cq->eq->core, cq);
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MLX5_SET(destroy_cq_in, in, opcode, MLX5_CMD_OP_DESTROY_CQ);
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MLX5_SET(destroy_cq_in, in, cqn, cq->cqn);
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MLX5_SET(destroy_cq_in, in, uid, cq->uid);
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err = mlx5_cmd_exec_in(dev, destroy_cq, in);
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if (err)
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return err;
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synchronize_irq(cq->irqn);
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mlx5_cq_put(cq);
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wait_for_completion(&cq->free);
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return 0;
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}
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EXPORT_SYMBOL(mlx5_core_destroy_cq);
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int mlx5_core_query_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq,
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u32 *out)
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{
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u32 in[MLX5_ST_SZ_DW(query_cq_in)] = {};
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MLX5_SET(query_cq_in, in, opcode, MLX5_CMD_OP_QUERY_CQ);
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MLX5_SET(query_cq_in, in, cqn, cq->cqn);
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return mlx5_cmd_exec_inout(dev, query_cq, in, out);
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}
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EXPORT_SYMBOL(mlx5_core_query_cq);
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int mlx5_core_modify_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq,
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u32 *in, int inlen)
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{
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u32 out[MLX5_ST_SZ_DW(modify_cq_out)] = {};
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MLX5_SET(modify_cq_in, in, opcode, MLX5_CMD_OP_MODIFY_CQ);
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MLX5_SET(modify_cq_in, in, uid, cq->uid);
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return mlx5_cmd_exec(dev, in, inlen, out, sizeof(out));
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}
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EXPORT_SYMBOL(mlx5_core_modify_cq);
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int mlx5_core_modify_cq_moderation(struct mlx5_core_dev *dev,
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struct mlx5_core_cq *cq,
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u16 cq_period,
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u16 cq_max_count)
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{
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u32 in[MLX5_ST_SZ_DW(modify_cq_in)] = {};
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void *cqc;
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MLX5_SET(modify_cq_in, in, cqn, cq->cqn);
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cqc = MLX5_ADDR_OF(modify_cq_in, in, cq_context);
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MLX5_SET(cqc, cqc, cq_period, cq_period);
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MLX5_SET(cqc, cqc, cq_max_count, cq_max_count);
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MLX5_SET(modify_cq_in, in,
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modify_field_select_resize_field_select.modify_field_select.modify_field_select,
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MLX5_CQ_MODIFY_PERIOD | MLX5_CQ_MODIFY_COUNT);
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return mlx5_core_modify_cq(dev, cq, in, sizeof(in));
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}
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EXPORT_SYMBOL(mlx5_core_modify_cq_moderation);
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