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/*-
* 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);
}
}
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