summaryrefslogtreecommitdiff
path: root/drivers/net/ethernet/mellanox/mlx5/core/cq.c
blob: 1016e05c7ec7fed09a24d5801820e4bb4671afc7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
/*
 * 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 (refcount_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)) {
		refcount_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))
		refcount_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 (refcount_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)
		refcount_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 (refcount_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;
	refcount_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);

	cq->uar = dev->priv.uar;

	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 (refcount_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);
}