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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2017 Intel Corporation
*/
#include <sys/queue.h>
#include <string.h>
#include <rte_tailq.h>
#include <rte_memzone.h>
#include <rte_rwlock.h>
#include <rte_eal_memconfig.h>
#include "rte_event_ring.h"
TAILQ_HEAD(rte_event_ring_list, rte_tailq_entry);
static struct rte_tailq_elem rte_event_ring_tailq = {
.name = RTE_TAILQ_EVENT_RING_NAME,
};
EAL_REGISTER_TAILQ(rte_event_ring_tailq)
int
rte_event_ring_init(struct rte_event_ring *r, const char *name,
unsigned int count, unsigned int flags)
{
/* compilation-time checks */
RTE_BUILD_BUG_ON((sizeof(struct rte_event_ring) &
RTE_CACHE_LINE_MASK) != 0);
/* init the ring structure */
return rte_ring_init(&r->r, name, count, flags);
}
/* create the ring */
struct rte_event_ring *
rte_event_ring_create(const char *name, unsigned int count, int socket_id,
unsigned int flags)
{
char mz_name[RTE_MEMZONE_NAMESIZE];
struct rte_event_ring *r;
struct rte_tailq_entry *te;
const struct rte_memzone *mz;
ssize_t ring_size;
int mz_flags = 0;
struct rte_event_ring_list *ring_list = NULL;
const unsigned int requested_count = count;
int ret;
ring_list = RTE_TAILQ_CAST(rte_event_ring_tailq.head,
rte_event_ring_list);
/* for an exact size ring, round up from count to a power of two */
if (flags & RING_F_EXACT_SZ)
count = rte_align32pow2(count + 1);
else if (!rte_is_power_of_2(count)) {
rte_errno = EINVAL;
return NULL;
}
ring_size = sizeof(*r) + (count * sizeof(struct rte_event));
ret = snprintf(mz_name, sizeof(mz_name), "%s%s",
RTE_RING_MZ_PREFIX, name);
if (ret < 0 || ret >= (int)sizeof(mz_name)) {
rte_errno = ENAMETOOLONG;
return NULL;
}
te = rte_zmalloc("RING_TAILQ_ENTRY", sizeof(*te), 0);
if (te == NULL) {
RTE_LOG(ERR, RING, "Cannot reserve memory for tailq\n");
rte_errno = ENOMEM;
return NULL;
}
rte_rwlock_write_lock(RTE_EAL_TAILQ_RWLOCK);
/*
* reserve a memory zone for this ring. If we can't get rte_config or
* we are secondary process, the memzone_reserve function will set
* rte_errno for us appropriately - hence no check in this this function
*/
mz = rte_memzone_reserve(mz_name, ring_size, socket_id, mz_flags);
if (mz != NULL) {
r = mz->addr;
/* Check return value in case rte_ring_init() fails on size */
int err = rte_event_ring_init(r, name, requested_count, flags);
if (err) {
RTE_LOG(ERR, RING, "Ring init failed\n");
if (rte_memzone_free(mz) != 0)
RTE_LOG(ERR, RING, "Cannot free memzone\n");
rte_free(te);
rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK);
return NULL;
}
te->data = (void *) r;
r->r.memzone = mz;
TAILQ_INSERT_TAIL(ring_list, te, next);
} else {
r = NULL;
RTE_LOG(ERR, RING, "Cannot reserve memory\n");
rte_free(te);
}
rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK);
return r;
}
struct rte_event_ring *
rte_event_ring_lookup(const char *name)
{
struct rte_tailq_entry *te;
struct rte_event_ring *r = NULL;
struct rte_event_ring_list *ring_list;
ring_list = RTE_TAILQ_CAST(rte_event_ring_tailq.head,
rte_event_ring_list);
rte_rwlock_read_lock(RTE_EAL_TAILQ_RWLOCK);
TAILQ_FOREACH(te, ring_list, next) {
r = (struct rte_event_ring *) te->data;
if (strncmp(name, r->r.name, RTE_RING_NAMESIZE) == 0)
break;
}
rte_rwlock_read_unlock(RTE_EAL_TAILQ_RWLOCK);
if (te == NULL) {
rte_errno = ENOENT;
return NULL;
}
return r;
}
/* free the ring */
void
rte_event_ring_free(struct rte_event_ring *r)
{
struct rte_event_ring_list *ring_list = NULL;
struct rte_tailq_entry *te;
if (r == NULL)
return;
/*
* Ring was not created with rte_event_ring_create,
* therefore, there is no memzone to free.
*/
if (r->r.memzone == NULL) {
RTE_LOG(ERR, RING,
"Cannot free ring (not created with rte_event_ring_create()");
return;
}
if (rte_memzone_free(r->r.memzone) != 0) {
RTE_LOG(ERR, RING, "Cannot free memory\n");
return;
}
ring_list = RTE_TAILQ_CAST(rte_event_ring_tailq.head,
rte_event_ring_list);
rte_rwlock_write_lock(RTE_EAL_TAILQ_RWLOCK);
/* find out tailq entry */
TAILQ_FOREACH(te, ring_list, next) {
if (te->data == (void *) r)
break;
}
if (te == NULL) {
rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK);
return;
}
TAILQ_REMOVE(ring_list, te, next);
rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK);
rte_free(te);
}
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