2 * Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved.
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
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8 * OpenIB.org BSD license below:
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11 * without modification, are permitted provided that the following
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15 * copyright notice, this list of conditions and the following
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21 * provided with the distribution.
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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"
43 #define TASKLET_MAX_TIME 2
44 #define TASKLET_MAX_TIME_JIFFIES msecs_to_jiffies(TASKLET_MAX_TIME)
46 void mlx5_cq_tasklet_cb(unsigned long data)
49 unsigned long end = jiffies + TASKLET_MAX_TIME_JIFFIES;
50 struct mlx5_eq_tasklet *ctx = (struct mlx5_eq_tasklet *)data;
51 struct mlx5_core_cq *mcq;
52 struct mlx5_core_cq *temp;
54 spin_lock_irqsave(&ctx->lock, flags);
55 list_splice_tail_init(&ctx->list, &ctx->process_list);
56 spin_unlock_irqrestore(&ctx->lock, flags);
58 list_for_each_entry_safe(mcq, temp, &ctx->process_list,
60 list_del_init(&mcq->tasklet_ctx.list);
61 mcq->tasklet_ctx.comp(mcq);
63 if (time_after(jiffies, end))
67 if (!list_empty(&ctx->process_list))
68 tasklet_schedule(&ctx->task);
71 static void mlx5_add_cq_to_tasklet(struct mlx5_core_cq *cq)
74 struct mlx5_eq_tasklet *tasklet_ctx = cq->tasklet_ctx.priv;
76 spin_lock_irqsave(&tasklet_ctx->lock, flags);
77 /* When migrating CQs between EQs will be implemented, please note
78 * that you need to sync this point. It is possible that
79 * while migrating a CQ, completions on the old EQs could
82 if (list_empty_careful(&cq->tasklet_ctx.list)) {
84 list_add_tail(&cq->tasklet_ctx.list, &tasklet_ctx->list);
86 spin_unlock_irqrestore(&tasklet_ctx->lock, flags);
89 int mlx5_core_create_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq,
92 int eqn = MLX5_GET(cqc, MLX5_ADDR_OF(create_cq_in, in, cq_context), c_eqn);
93 u32 dout[MLX5_ST_SZ_DW(destroy_cq_out)];
94 u32 out[MLX5_ST_SZ_DW(create_cq_out)];
95 u32 din[MLX5_ST_SZ_DW(destroy_cq_in)];
96 struct mlx5_eq_comp *eq;
99 eq = mlx5_eqn2comp_eq(dev, eqn);
103 memset(out, 0, sizeof(out));
104 MLX5_SET(create_cq_in, in, opcode, MLX5_CMD_OP_CREATE_CQ);
105 err = mlx5_cmd_exec(dev, in, inlen, out, sizeof(out));
109 cq->cqn = MLX5_GET(create_cq_out, out, cqn);
113 cq->uid = MLX5_GET(create_cq_in, in, uid);
114 refcount_set(&cq->refcount, 1);
115 init_completion(&cq->free);
117 cq->comp = mlx5_add_cq_to_tasklet;
118 /* assuming CQ will be deleted before the EQ */
119 cq->tasklet_ctx.priv = &eq->tasklet_ctx;
120 INIT_LIST_HEAD(&cq->tasklet_ctx.list);
122 /* Add to comp EQ CQ tree to recv comp events */
123 err = mlx5_eq_add_cq(&eq->core, cq);
127 /* Add to async EQ CQ tree to recv async events */
128 err = mlx5_eq_add_cq(mlx5_get_async_eq(dev), cq);
132 cq->pid = current->pid;
133 err = mlx5_debug_cq_add(dev, cq);
135 mlx5_core_dbg(dev, "failed adding CP 0x%x to debug file system\n",
138 cq->uar = dev->priv.uar;
143 mlx5_eq_del_cq(&eq->core, cq);
145 memset(din, 0, sizeof(din));
146 memset(dout, 0, sizeof(dout));
147 MLX5_SET(destroy_cq_in, din, opcode, MLX5_CMD_OP_DESTROY_CQ);
148 MLX5_SET(destroy_cq_in, din, cqn, cq->cqn);
149 MLX5_SET(destroy_cq_in, din, uid, cq->uid);
150 mlx5_cmd_exec(dev, din, sizeof(din), dout, sizeof(dout));
153 EXPORT_SYMBOL(mlx5_core_create_cq);
155 int mlx5_core_destroy_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq)
157 u32 out[MLX5_ST_SZ_DW(destroy_cq_out)] = {0};
158 u32 in[MLX5_ST_SZ_DW(destroy_cq_in)] = {0};
161 err = mlx5_eq_del_cq(mlx5_get_async_eq(dev), cq);
165 err = mlx5_eq_del_cq(&cq->eq->core, cq);
169 MLX5_SET(destroy_cq_in, in, opcode, MLX5_CMD_OP_DESTROY_CQ);
170 MLX5_SET(destroy_cq_in, in, cqn, cq->cqn);
171 MLX5_SET(destroy_cq_in, in, uid, cq->uid);
172 err = mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
176 synchronize_irq(cq->irqn);
178 mlx5_debug_cq_remove(dev, cq);
180 wait_for_completion(&cq->free);
184 EXPORT_SYMBOL(mlx5_core_destroy_cq);
186 int mlx5_core_query_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq,
187 u32 *out, int outlen)
189 u32 in[MLX5_ST_SZ_DW(query_cq_in)] = {0};
191 MLX5_SET(query_cq_in, in, opcode, MLX5_CMD_OP_QUERY_CQ);
192 MLX5_SET(query_cq_in, in, cqn, cq->cqn);
193 return mlx5_cmd_exec(dev, in, sizeof(in), out, outlen);
195 EXPORT_SYMBOL(mlx5_core_query_cq);
197 int mlx5_core_modify_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq,
200 u32 out[MLX5_ST_SZ_DW(modify_cq_out)] = {0};
202 MLX5_SET(modify_cq_in, in, opcode, MLX5_CMD_OP_MODIFY_CQ);
203 MLX5_SET(modify_cq_in, in, uid, cq->uid);
204 return mlx5_cmd_exec(dev, in, inlen, out, sizeof(out));
206 EXPORT_SYMBOL(mlx5_core_modify_cq);
208 int mlx5_core_modify_cq_moderation(struct mlx5_core_dev *dev,
209 struct mlx5_core_cq *cq,
213 u32 in[MLX5_ST_SZ_DW(modify_cq_in)] = {0};
216 MLX5_SET(modify_cq_in, in, cqn, cq->cqn);
217 cqc = MLX5_ADDR_OF(modify_cq_in, in, cq_context);
218 MLX5_SET(cqc, cqc, cq_period, cq_period);
219 MLX5_SET(cqc, cqc, cq_max_count, cq_max_count);
220 MLX5_SET(modify_cq_in, in,
221 modify_field_select_resize_field_select.modify_field_select.modify_field_select,
222 MLX5_CQ_MODIFY_PERIOD | MLX5_CQ_MODIFY_COUNT);
224 return mlx5_core_modify_cq(dev, cq, in, sizeof(in));
226 EXPORT_SYMBOL(mlx5_core_modify_cq_moderation);