summaryrefslogtreecommitdiffstats
path: root/src/spdk/lib/nvme/nvme_io_msg.c
blob: fb5aec3d4dcc8134df8c583ba61764d83c190f5f (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
/*-
 *   BSD LICENSE
 *
 *   Copyright (c) Intel Corporation.
 *   All rights reserved.
 *
 *   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.
 *     * Neither the name of Intel Corporation nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "nvme_internal.h"
#include "nvme_io_msg.h"

#define SPDK_NVME_MSG_IO_PROCESS_SIZE 8

/**
 * Send message to IO queue.
 */
int
nvme_io_msg_send(struct spdk_nvme_ctrlr *ctrlr, uint32_t nsid, spdk_nvme_io_msg_fn fn,
		 void *arg)
{
	int rc;
	struct spdk_nvme_io_msg *io;

	/* Protect requests ring against preemptive producers */
	pthread_mutex_lock(&ctrlr->external_io_msgs_lock);

	io = (struct spdk_nvme_io_msg *)calloc(1, sizeof(struct spdk_nvme_io_msg));
	if (!io) {
		SPDK_ERRLOG("IO msg allocation failed.");
		pthread_mutex_unlock(&ctrlr->external_io_msgs_lock);
		return -ENOMEM;
	}

	io->ctrlr = ctrlr;
	io->nsid = nsid;
	io->fn = fn;
	io->arg = arg;

	rc = spdk_ring_enqueue(ctrlr->external_io_msgs, (void **)&io, 1, NULL);
	if (rc != 1) {
		assert(false);
		free(io);
		pthread_mutex_unlock(&ctrlr->external_io_msgs_lock);
		return -ENOMEM;
	}

	pthread_mutex_unlock(&ctrlr->external_io_msgs_lock);

	return 0;
}

int
nvme_io_msg_process(struct spdk_nvme_ctrlr *ctrlr)
{
	int i;
	int count;
	struct spdk_nvme_io_msg *io;
	void *requests[SPDK_NVME_MSG_IO_PROCESS_SIZE];

	if (!ctrlr->external_io_msgs || !ctrlr->external_io_msgs_qpair) {
		/* Not ready or pending reset */
		return 0;
	}

	spdk_nvme_qpair_process_completions(ctrlr->external_io_msgs_qpair, 0);

	count = spdk_ring_dequeue(ctrlr->external_io_msgs, requests,
				  SPDK_NVME_MSG_IO_PROCESS_SIZE);
	if (count == 0) {
		return 0;
	}

	for (i = 0; i < count; i++) {
		io = requests[i];

		assert(io != NULL);

		io->fn(io->ctrlr, io->nsid, io->arg);
		free(io);
	}

	return count;
}

static bool
nvme_io_msg_is_producer_registered(struct spdk_nvme_ctrlr *ctrlr,
				   struct nvme_io_msg_producer *io_msg_producer)
{
	struct nvme_io_msg_producer *tmp;

	STAILQ_FOREACH(tmp, &ctrlr->io_producers, link) {
		if (tmp == io_msg_producer) {
			return true;
		}
	}
	return false;
}

int
nvme_io_msg_ctrlr_register(struct spdk_nvme_ctrlr *ctrlr,
			   struct nvme_io_msg_producer *io_msg_producer)
{
	if (io_msg_producer == NULL) {
		SPDK_ERRLOG("io_msg_producer cannot be NULL\n");
		return -EINVAL;
	}

	if (nvme_io_msg_is_producer_registered(ctrlr, io_msg_producer)) {
		return -EEXIST;
	}

	if (!STAILQ_EMPTY(&ctrlr->io_producers) || ctrlr->is_resetting) {
		/* There are registered producers - IO messaging already started */
		STAILQ_INSERT_TAIL(&ctrlr->io_producers, io_msg_producer, link);
		return 0;
	}

	pthread_mutex_init(&ctrlr->external_io_msgs_lock, NULL);

	/**
	 * Initialize ring and qpair for controller
	 */
	ctrlr->external_io_msgs = spdk_ring_create(SPDK_RING_TYPE_MP_SC, 65536, SPDK_ENV_SOCKET_ID_ANY);
	if (!ctrlr->external_io_msgs) {
		SPDK_ERRLOG("Unable to allocate memory for message ring\n");
		return -ENOMEM;
	}

	ctrlr->external_io_msgs_qpair = spdk_nvme_ctrlr_alloc_io_qpair(ctrlr, NULL, 0);
	if (ctrlr->external_io_msgs_qpair == NULL) {
		SPDK_ERRLOG("spdk_nvme_ctrlr_alloc_io_qpair() failed\n");
		spdk_ring_free(ctrlr->external_io_msgs);
		ctrlr->external_io_msgs = NULL;
		return -ENOMEM;
	}

	STAILQ_INSERT_TAIL(&ctrlr->io_producers, io_msg_producer, link);

	return 0;
}

void
nvme_io_msg_ctrlr_update(struct spdk_nvme_ctrlr *ctrlr)
{
	struct nvme_io_msg_producer *io_msg_producer;

	/* Update all producers */
	STAILQ_FOREACH(io_msg_producer, &ctrlr->io_producers, link) {
		io_msg_producer->update(ctrlr);
	}
}

void
nvme_io_msg_ctrlr_detach(struct spdk_nvme_ctrlr *ctrlr)
{
	struct nvme_io_msg_producer *io_msg_producer, *tmp;

	/* Stop all producers */
	STAILQ_FOREACH_SAFE(io_msg_producer, &ctrlr->io_producers, link, tmp) {
		io_msg_producer->stop(ctrlr);
		STAILQ_REMOVE(&ctrlr->io_producers, io_msg_producer, nvme_io_msg_producer, link);
	}

	if (ctrlr->external_io_msgs) {
		spdk_ring_free(ctrlr->external_io_msgs);
		ctrlr->external_io_msgs = NULL;
	}

	if (ctrlr->external_io_msgs_qpair) {
		spdk_nvme_ctrlr_free_io_qpair(ctrlr->external_io_msgs_qpair);
		ctrlr->external_io_msgs_qpair = NULL;
	}

	pthread_mutex_destroy(&ctrlr->external_io_msgs_lock);
}

void
nvme_io_msg_ctrlr_unregister(struct spdk_nvme_ctrlr *ctrlr,
			     struct nvme_io_msg_producer *io_msg_producer)
{
	assert(io_msg_producer != NULL);

	if (!nvme_io_msg_is_producer_registered(ctrlr, io_msg_producer)) {
		return;
	}

	STAILQ_REMOVE(&ctrlr->io_producers, io_msg_producer, nvme_io_msg_producer, link);
	if (STAILQ_EMPTY(&ctrlr->io_producers)) {
		nvme_io_msg_ctrlr_detach(ctrlr);
	}
}