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
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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 <rdma/ib_verbs.h>
38 #include <linux/mlx5/cq.h>
39 #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(struct tasklet_struct
*t
)
48 unsigned long end
= jiffies
+ TASKLET_MAX_TIME_JIFFIES
;
49 struct mlx5_eq_tasklet
*ctx
= from_tasklet(ctx
, t
, task
);
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
, NULL
);
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
,
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
,
90 u32
*in
, int inlen
, u32
*out
, int outlen
)
92 int eqn
= MLX5_GET(cqc
, MLX5_ADDR_OF(create_cq_in
, in
, cq_context
),
93 c_eqn_or_apu_element
);
94 u32 din
[MLX5_ST_SZ_DW(destroy_cq_in
)] = {};
95 struct mlx5_eq_comp
*eq
;
98 eq
= mlx5_eqn2comp_eq(dev
, eqn
);
102 memset(out
, 0, outlen
);
103 MLX5_SET(create_cq_in
, in
, opcode
, MLX5_CMD_OP_CREATE_CQ
);
104 err
= mlx5_cmd_exec(dev
, in
, inlen
, out
, outlen
);
108 cq
->cqn
= MLX5_GET(create_cq_out
, out
, cqn
);
112 cq
->uid
= MLX5_GET(create_cq_in
, in
, uid
);
113 refcount_set(&cq
->refcount
, 1);
114 init_completion(&cq
->free
);
116 cq
->comp
= mlx5_add_cq_to_tasklet
;
117 /* assuming CQ will be deleted before the EQ */
118 cq
->tasklet_ctx
.priv
= &eq
->tasklet_ctx
;
119 INIT_LIST_HEAD(&cq
->tasklet_ctx
.list
);
121 /* Add to comp EQ CQ tree to recv comp events */
122 err
= mlx5_eq_add_cq(&eq
->core
, cq
);
126 /* Add to async EQ CQ tree to recv async events */
127 err
= mlx5_eq_add_cq(mlx5_get_async_eq(dev
), cq
);
131 cq
->pid
= current
->pid
;
132 err
= mlx5_debug_cq_add(dev
, cq
);
134 mlx5_core_dbg(dev
, "failed adding CP 0x%x to debug file system\n",
137 cq
->uar
= dev
->priv
.uar
;
138 cq
->irqn
= eq
->core
.irqn
;
143 mlx5_eq_del_cq(&eq
->core
, cq
);
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_SET(destroy_cq_in
, din
, uid
, cq
->uid
);
148 mlx5_cmd_exec_in(dev
, destroy_cq
, din
);
151 EXPORT_SYMBOL(mlx5_core_create_cq
);
153 int mlx5_core_destroy_cq(struct mlx5_core_dev
*dev
, struct mlx5_core_cq
*cq
)
155 u32 in
[MLX5_ST_SZ_DW(destroy_cq_in
)] = {};
158 mlx5_eq_del_cq(mlx5_get_async_eq(dev
), cq
);
159 mlx5_eq_del_cq(&cq
->eq
->core
, cq
);
161 MLX5_SET(destroy_cq_in
, in
, opcode
, MLX5_CMD_OP_DESTROY_CQ
);
162 MLX5_SET(destroy_cq_in
, in
, cqn
, cq
->cqn
);
163 MLX5_SET(destroy_cq_in
, in
, uid
, cq
->uid
);
164 err
= mlx5_cmd_exec_in(dev
, destroy_cq
, in
);
168 synchronize_irq(cq
->irqn
);
170 mlx5_debug_cq_remove(dev
, cq
);
172 wait_for_completion(&cq
->free
);
176 EXPORT_SYMBOL(mlx5_core_destroy_cq
);
178 int mlx5_core_query_cq(struct mlx5_core_dev
*dev
, struct mlx5_core_cq
*cq
,
181 u32 in
[MLX5_ST_SZ_DW(query_cq_in
)] = {};
183 MLX5_SET(query_cq_in
, in
, opcode
, MLX5_CMD_OP_QUERY_CQ
);
184 MLX5_SET(query_cq_in
, in
, cqn
, cq
->cqn
);
185 return mlx5_cmd_exec_inout(dev
, query_cq
, in
, out
);
187 EXPORT_SYMBOL(mlx5_core_query_cq
);
189 int mlx5_core_modify_cq(struct mlx5_core_dev
*dev
, struct mlx5_core_cq
*cq
,
192 u32 out
[MLX5_ST_SZ_DW(modify_cq_out
)] = {};
194 MLX5_SET(modify_cq_in
, in
, opcode
, MLX5_CMD_OP_MODIFY_CQ
);
195 MLX5_SET(modify_cq_in
, in
, uid
, cq
->uid
);
196 return mlx5_cmd_exec(dev
, in
, inlen
, out
, sizeof(out
));
198 EXPORT_SYMBOL(mlx5_core_modify_cq
);
200 int mlx5_core_modify_cq_moderation(struct mlx5_core_dev
*dev
,
201 struct mlx5_core_cq
*cq
,
205 u32 in
[MLX5_ST_SZ_DW(modify_cq_in
)] = {};
208 MLX5_SET(modify_cq_in
, in
, cqn
, cq
->cqn
);
209 cqc
= MLX5_ADDR_OF(modify_cq_in
, in
, cq_context
);
210 MLX5_SET(cqc
, cqc
, cq_period
, cq_period
);
211 MLX5_SET(cqc
, cqc
, cq_max_count
, cq_max_count
);
212 MLX5_SET(modify_cq_in
, in
,
213 modify_field_select_resize_field_select
.modify_field_select
.modify_field_select
,
214 MLX5_CQ_MODIFY_PERIOD
| MLX5_CQ_MODIFY_COUNT
);
216 return mlx5_core_modify_cq(dev
, cq
, in
, sizeof(in
));
218 EXPORT_SYMBOL(mlx5_core_modify_cq_moderation
);