2 * Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved.
4 * This software is available to you under a choice of one of two
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6 * General Public License (GPL) Version 2, available from the file
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23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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33 #include <linux/kernel.h>
34 #include <linux/module.h>
35 #include <linux/hardirq.h>
36 #include <linux/mlx5/driver.h>
37 #include <linux/mlx5/cmd.h>
38 #include <rdma/ib_verbs.h>
39 #include <linux/mlx5/cq.h>
40 #include "mlx5_core.h"
42 #define TASKLET_MAX_TIME 2
43 #define TASKLET_MAX_TIME_JIFFIES msecs_to_jiffies(TASKLET_MAX_TIME)
45 void mlx5_cq_tasklet_cb(unsigned long data)
48 unsigned long end = jiffies + TASKLET_MAX_TIME_JIFFIES;
49 struct mlx5_eq_tasklet *ctx = (struct mlx5_eq_tasklet *)data;
50 struct mlx5_core_cq *mcq;
51 struct mlx5_core_cq *temp;
53 spin_lock_irqsave(&ctx->lock, flags);
54 list_splice_tail_init(&ctx->list, &ctx->process_list);
55 spin_unlock_irqrestore(&ctx->lock, flags);
57 list_for_each_entry_safe(mcq, temp, &ctx->process_list,
59 list_del_init(&mcq->tasklet_ctx.list);
60 mcq->tasklet_ctx.comp(mcq);
62 if (time_after(jiffies, end))
66 if (!list_empty(&ctx->process_list))
67 tasklet_schedule(&ctx->task);
70 static void mlx5_add_cq_to_tasklet(struct mlx5_core_cq *cq)
73 struct mlx5_eq_tasklet *tasklet_ctx = cq->tasklet_ctx.priv;
75 spin_lock_irqsave(&tasklet_ctx->lock, flags);
76 /* When migrating CQs between EQs will be implemented, please note
77 * that you need to sync this point. It is possible that
78 * while migrating a CQ, completions on the old EQs could
81 if (list_empty_careful(&cq->tasklet_ctx.list)) {
83 list_add_tail(&cq->tasklet_ctx.list, &tasklet_ctx->list);
85 spin_unlock_irqrestore(&tasklet_ctx->lock, flags);
88 int mlx5_core_create_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq,
91 int eqn = MLX5_GET(cqc, MLX5_ADDR_OF(create_cq_in, in, cq_context), c_eqn);
92 u32 dout[MLX5_ST_SZ_DW(destroy_cq_out)];
93 u32 out[MLX5_ST_SZ_DW(create_cq_out)];
94 u32 din[MLX5_ST_SZ_DW(destroy_cq_in)];
98 eq = mlx5_eqn2eq(dev, eqn);
102 memset(out, 0, sizeof(out));
103 MLX5_SET(create_cq_in, in, opcode, MLX5_CMD_OP_CREATE_CQ);
104 err = mlx5_cmd_exec(dev, in, inlen, out, sizeof(out));
108 cq->cqn = MLX5_GET(create_cq_out, out, cqn);
112 refcount_set(&cq->refcount, 1);
113 init_completion(&cq->free);
115 cq->comp = mlx5_add_cq_to_tasklet;
116 /* assuming CQ will be deleted before the EQ */
117 cq->tasklet_ctx.priv = &eq->tasklet_ctx;
118 INIT_LIST_HEAD(&cq->tasklet_ctx.list);
120 /* Add to comp EQ CQ tree to recv comp events */
121 err = mlx5_eq_add_cq(eq, cq);
125 /* Add to async EQ CQ tree to recv async events */
126 err = mlx5_eq_add_cq(&dev->priv.eq_table.async_eq, cq);
130 cq->pid = current->pid;
131 err = mlx5_debug_cq_add(dev, cq);
133 mlx5_core_dbg(dev, "failed adding CP 0x%x to debug file system\n",
136 cq->uar = dev->priv.uar;
141 mlx5_eq_del_cq(eq, cq);
143 memset(din, 0, sizeof(din));
144 memset(dout, 0, sizeof(dout));
145 MLX5_SET(destroy_cq_in, din, opcode, MLX5_CMD_OP_DESTROY_CQ);
146 MLX5_SET(destroy_cq_in, din, cqn, cq->cqn);
147 mlx5_cmd_exec(dev, din, sizeof(din), dout, sizeof(dout));
150 EXPORT_SYMBOL(mlx5_core_create_cq);
152 int mlx5_core_destroy_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq)
154 u32 out[MLX5_ST_SZ_DW(destroy_cq_out)] = {0};
155 u32 in[MLX5_ST_SZ_DW(destroy_cq_in)] = {0};
158 err = mlx5_eq_del_cq(&dev->priv.eq_table.async_eq, cq);
162 err = mlx5_eq_del_cq(cq->eq, cq);
166 MLX5_SET(destroy_cq_in, in, opcode, MLX5_CMD_OP_DESTROY_CQ);
167 MLX5_SET(destroy_cq_in, in, cqn, cq->cqn);
168 err = mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
172 synchronize_irq(cq->irqn);
174 mlx5_debug_cq_remove(dev, cq);
176 wait_for_completion(&cq->free);
180 EXPORT_SYMBOL(mlx5_core_destroy_cq);
182 int mlx5_core_query_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq,
183 u32 *out, int outlen)
185 u32 in[MLX5_ST_SZ_DW(query_cq_in)] = {0};
187 MLX5_SET(query_cq_in, in, opcode, MLX5_CMD_OP_QUERY_CQ);
188 MLX5_SET(query_cq_in, in, cqn, cq->cqn);
189 return mlx5_cmd_exec(dev, in, sizeof(in), out, outlen);
191 EXPORT_SYMBOL(mlx5_core_query_cq);
193 int mlx5_core_modify_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq,
196 u32 out[MLX5_ST_SZ_DW(modify_cq_out)] = {0};
198 MLX5_SET(modify_cq_in, in, opcode, MLX5_CMD_OP_MODIFY_CQ);
199 return mlx5_cmd_exec(dev, in, inlen, out, sizeof(out));
201 EXPORT_SYMBOL(mlx5_core_modify_cq);
203 int mlx5_core_modify_cq_moderation(struct mlx5_core_dev *dev,
204 struct mlx5_core_cq *cq,
208 u32 in[MLX5_ST_SZ_DW(modify_cq_in)] = {0};
211 MLX5_SET(modify_cq_in, in, cqn, cq->cqn);
212 cqc = MLX5_ADDR_OF(modify_cq_in, in, cq_context);
213 MLX5_SET(cqc, cqc, cq_period, cq_period);
214 MLX5_SET(cqc, cqc, cq_max_count, cq_max_count);
215 MLX5_SET(modify_cq_in, in,
216 modify_field_select_resize_field_select.modify_field_select.modify_field_select,
217 MLX5_CQ_MODIFY_PERIOD | MLX5_CQ_MODIFY_COUNT);
219 return mlx5_core_modify_cq(dev, cq, in, sizeof(in));
221 EXPORT_SYMBOL(mlx5_core_modify_cq_moderation);