#include <svm/message_queue.h>
#include <vppinfra/mem.h>
+#include <vppinfra/format.h>
+#include <vppinfra/time.h>
+#include <sys/eventfd.h>
+#include <sys/socket.h>
static inline svm_msg_q_ring_t *
svm_msg_q_ring_inline (svm_msg_q_t * mq, u32 ring_index)
svm_msg_q_ring_data (svm_msg_q_ring_t * ring, u32 elt_index)
{
ASSERT (elt_index < ring->nitems);
- return (ring->data + elt_index * ring->elsize);
+ return (ring->shr->data + elt_index * ring->elsize);
}
-svm_msg_q_t *
-svm_msg_q_alloc (svm_msg_q_cfg_t * cfg)
+static void
+svm_msg_q_init_mutex (svm_msg_q_shared_queue_t *sq)
+{
+ pthread_mutexattr_t attr;
+ pthread_condattr_t cattr;
+
+ clib_memset (&attr, 0, sizeof (attr));
+ clib_memset (&cattr, 0, sizeof (cattr));
+
+ if (pthread_mutexattr_init (&attr))
+ clib_unix_warning ("mutexattr_init");
+ if (pthread_mutexattr_setpshared (&attr, PTHREAD_PROCESS_SHARED))
+ clib_unix_warning ("pthread_mutexattr_setpshared");
+ if (pthread_mutexattr_setrobust (&attr, PTHREAD_MUTEX_ROBUST))
+ clib_unix_warning ("setrobust");
+ if (pthread_mutex_init (&sq->mutex, &attr))
+ clib_unix_warning ("mutex_init");
+ if (pthread_mutexattr_destroy (&attr))
+ clib_unix_warning ("mutexattr_destroy");
+ if (pthread_condattr_init (&cattr))
+ clib_unix_warning ("condattr_init");
+ if (pthread_condattr_setpshared (&cattr, PTHREAD_PROCESS_SHARED))
+ clib_unix_warning ("condattr_setpshared");
+ if (pthread_cond_init (&sq->condvar, &cattr))
+ clib_unix_warning ("cond_init1");
+ if (pthread_condattr_destroy (&cattr))
+ clib_unix_warning ("cond_init2");
+}
+
+svm_msg_q_shared_t *
+svm_msg_q_init (void *base, svm_msg_q_cfg_t *cfg)
+{
+ svm_msg_q_ring_shared_t *ring;
+ svm_msg_q_shared_queue_t *sq;
+ svm_msg_q_shared_t *smq;
+ u32 q_sz, offset;
+ int i;
+
+ q_sz = sizeof (*sq) + cfg->q_nitems * sizeof (svm_msg_q_msg_t);
+
+ smq = (svm_msg_q_shared_t *) base;
+ sq = smq->q;
+ clib_memset (sq, 0, sizeof (*sq));
+ sq->elsize = sizeof (svm_msg_q_msg_t);
+ sq->maxsize = cfg->q_nitems;
+ smq->n_rings = cfg->n_rings;
+ ring = (void *) ((u8 *) smq->q + q_sz);
+ for (i = 0; i < cfg->n_rings; i++)
+ {
+ ring->elsize = cfg->ring_cfgs[i].elsize;
+ ring->nitems = cfg->ring_cfgs[i].nitems;
+ ring->cursize = ring->head = ring->tail = 0;
+ offset = sizeof (*ring) + ring->nitems * ring->elsize;
+ ring = (void *) ((u8 *) ring + offset);
+ }
+
+ svm_msg_q_init_mutex (sq);
+
+ return smq;
+}
+
+uword
+svm_msg_q_size_to_alloc (svm_msg_q_cfg_t *cfg)
{
svm_msg_q_ring_cfg_t *ring_cfg;
- svm_msg_q_ring_t *ring;
- u8 *base, *rings_ptr;
- uword rings_sz = 0;
- vec_header_t *vh;
- svm_msg_q_t *mq;
- u32 vec_sz;
+ uword rings_sz = 0, mq_sz;
+ u32 q_sz;
int i;
ASSERT (cfg);
- vec_sz = vec_header_bytes (0) + sizeof (svm_msg_q_ring_t) * cfg->n_rings;
+ rings_sz = sizeof (svm_msg_q_ring_shared_t) * cfg->n_rings;
for (i = 0; i < cfg->n_rings; i++)
{
if (cfg->ring_cfgs[i].data)
rings_sz += (uword) ring_cfg->nitems * ring_cfg->elsize;
}
- base = clib_mem_alloc_aligned (sizeof (svm_msg_q_t) + vec_sz + rings_sz,
- CLIB_CACHE_LINE_BYTES);
+ q_sz = sizeof (svm_msg_q_shared_queue_t) +
+ cfg->q_nitems * sizeof (svm_msg_q_msg_t);
+ mq_sz = sizeof (svm_msg_q_shared_t) + q_sz + rings_sz;
+
+ return mq_sz;
+}
+
+svm_msg_q_shared_t *
+svm_msg_q_alloc (svm_msg_q_cfg_t *cfg)
+{
+ uword mq_sz;
+ u8 *base;
+
+ mq_sz = svm_msg_q_size_to_alloc (cfg);
+ base = clib_mem_alloc_aligned (mq_sz, CLIB_CACHE_LINE_BYTES);
if (!base)
return 0;
- mq = (svm_msg_q_t *) base;
- vh = (vec_header_t *) (base + sizeof (svm_msg_q_t));
- vh->len = cfg->n_rings;
- mq->rings = (svm_msg_q_ring_t *) (vh + 1);
- rings_ptr = (u8 *) mq->rings + vec_sz;
- for (i = 0; i < cfg->n_rings; i++)
+ return svm_msg_q_init (base, cfg);
+}
+
+void
+svm_msg_q_attach (svm_msg_q_t *mq, void *smq_base)
+{
+ svm_msg_q_ring_shared_t *ring;
+ svm_msg_q_shared_t *smq;
+ u32 i, n_rings, q_sz, offset;
+
+ smq = (svm_msg_q_shared_t *) smq_base;
+ mq->q.shr = smq->q;
+ mq->q.evtfd = -1;
+ n_rings = smq->n_rings;
+ vec_validate (mq->rings, n_rings - 1);
+ q_sz = sizeof (svm_msg_q_shared_queue_t) +
+ mq->q.shr->maxsize * sizeof (svm_msg_q_msg_t);
+ ring = (void *) ((u8 *) smq->q + q_sz);
+ for (i = 0; i < n_rings; i++)
{
- ring = &mq->rings[i];
- ring->elsize = cfg->ring_cfgs[i].elsize;
- ring->nitems = cfg->ring_cfgs[i].nitems;
- ring->cursize = ring->head = ring->tail = 0;
- if (cfg->ring_cfgs[i].data)
- ring->data = cfg->ring_cfgs[i].data;
- else
- {
- ring->data = rings_ptr;
- rings_ptr += (uword) ring->nitems * ring->elsize;
- }
+ mq->rings[i].nitems = ring->nitems;
+ mq->rings[i].elsize = ring->elsize;
+ mq->rings[i].shr = ring;
+ offset = sizeof (*ring) + ring->nitems * ring->elsize;
+ ring = (void *) ((u8 *) ring + offset);
}
- mq->q = svm_queue_init (cfg->q_nitems, sizeof (svm_msg_q_msg_t),
- cfg->consumer_pid, 0);
-
- return mq;
}
void
svm_msg_q_free (svm_msg_q_t * mq)
{
- svm_queue_free (mq->q);
+ clib_mem_free (mq->q.shr);
clib_mem_free (mq);
}
+static void
+svm_msg_q_send_signal (svm_msg_q_t *mq)
+{
+ if (mq->q.evtfd == -1)
+ {
+ (void) pthread_cond_broadcast (&mq->q.shr->condvar);
+ }
+ else
+ {
+ int __clib_unused rv;
+ u64 data = 1;
+
+ if (mq->q.evtfd < 0)
+ return;
+
+ rv = write (mq->q.evtfd, &data, sizeof (data));
+ if (PREDICT_FALSE (rv < 0))
+ clib_unix_warning ("signal write on %d returned %d", mq->q.evtfd, rv);
+ }
+}
+
svm_msg_q_msg_t
svm_msg_q_alloc_msg_w_ring (svm_msg_q_t * mq, u32 ring_index)
{
+ svm_msg_q_ring_shared_t *sr;
+ svm_msg_q_ring_t *ring;
svm_msg_q_msg_t msg;
- svm_msg_q_ring_t *ring = svm_msg_q_ring_inline (mq, ring_index);
- ASSERT (ring->cursize < ring->nitems);
+ ring = svm_msg_q_ring_inline (mq, ring_index);
+ sr = ring->shr;
+
+ ASSERT (sr->cursize < ring->nitems);
msg.ring_index = ring - mq->rings;
- msg.elt_index = ring->tail;
- ring->tail = (ring->tail + 1) % ring->nitems;
- __sync_fetch_and_add (&ring->cursize, 1);
+ msg.elt_index = sr->tail;
+ sr->tail = (sr->tail + 1) % ring->nitems;
+ clib_atomic_fetch_add_rel (&sr->cursize, 1);
return msg;
}
{
if (svm_msg_q_try_lock (mq))
return -1;
- if (PREDICT_FALSE (svm_msg_q_ring_is_full (mq, ring_index)))
+ if (PREDICT_FALSE (svm_msg_q_is_full (mq)
+ || svm_msg_q_ring_is_full (mq, ring_index)))
{
svm_msg_q_unlock (mq);
return -2;
}
*msg = svm_msg_q_alloc_msg_w_ring (mq, ring_index);
- if (PREDICT_FALSE (svm_msg_q_msg_is_invalid (msg)))
- {
- svm_msg_q_unlock (mq);
- return -2;
- }
}
else
{
svm_msg_q_lock (mq);
- while (svm_msg_q_ring_is_full (mq, ring_index))
+ while (svm_msg_q_is_full (mq)
+ || svm_msg_q_ring_is_full (mq, ring_index))
svm_msg_q_wait (mq);
*msg = svm_msg_q_alloc_msg_w_ring (mq, ring_index);
}
svm_msg_q_alloc_msg (svm_msg_q_t * mq, u32 nbytes)
{
svm_msg_q_msg_t msg = {.as_u64 = ~0 };
+ svm_msg_q_ring_shared_t *sr;
svm_msg_q_ring_t *ring;
vec_foreach (ring, mq->rings)
{
- if (ring->elsize < nbytes || ring->cursize == ring->nitems)
+ sr = ring->shr;
+ if (ring->elsize < nbytes || sr->cursize == ring->nitems)
continue;
msg.ring_index = ring - mq->rings;
- msg.elt_index = ring->tail;
- ring->tail = (ring->tail + 1) % ring->nitems;
- __sync_fetch_and_add (&ring->cursize, 1);
+ msg.elt_index = sr->tail;
+ sr->tail = (sr->tail + 1) % ring->nitems;
+ clib_atomic_fetch_add_rel (&sr->cursize, 1);
break;
}
return msg;
void
svm_msg_q_free_msg (svm_msg_q_t * mq, svm_msg_q_msg_t * msg)
{
+ svm_msg_q_ring_shared_t *sr;
svm_msg_q_ring_t *ring;
+ int need_signal;
- if (vec_len (mq->rings) <= msg->ring_index)
- return;
- ring = &mq->rings[msg->ring_index];
- if (msg->elt_index == ring->head)
+ ASSERT (vec_len (mq->rings) > msg->ring_index);
+ ring = svm_msg_q_ring_inline (mq, msg->ring_index);
+ sr = ring->shr;
+ if (msg->elt_index == sr->head)
{
- ring->head = (ring->head + 1) % ring->nitems;
+ sr->head = (sr->head + 1) % ring->nitems;
}
else
{
+ clib_warning ("message out of order");
/* for now, expect messages to be processed in order */
ASSERT (0);
}
- __sync_fetch_and_sub (&ring->cursize, 1);
+
+ need_signal = sr->cursize == ring->nitems;
+ clib_atomic_fetch_sub_rel (&sr->cursize, 1);
+
+ if (PREDICT_FALSE (need_signal))
+ svm_msg_q_send_signal (mq);
}
static int
svm_msq_q_msg_is_valid (svm_msg_q_t * mq, svm_msg_q_msg_t * msg)
{
u32 dist1, dist2, tail, head;
+ svm_msg_q_ring_shared_t *sr;
svm_msg_q_ring_t *ring;
if (vec_len (mq->rings) <= msg->ring_index)
return 0;
- ring = &mq->rings[msg->ring_index];
- tail = ring->tail;
- head = ring->head;
+
+ ring = svm_msg_q_ring_inline (mq, msg->ring_index);
+ sr = ring->shr;
+ tail = sr->tail;
+ head = sr->head;
dist1 = ((ring->nitems + msg->elt_index) - head) % ring->nitems;
if (tail == head)
- dist2 = (ring->cursize == 0) ? 0 : ring->nitems;
+ dist2 = (sr->cursize == 0) ? 0 : ring->nitems;
else
dist2 = ((ring->nitems + tail) - head) % ring->nitems;
return (dist1 < dist2);
}
+static void
+svm_msg_q_add_raw (svm_msg_q_t *mq, u8 *elem)
+{
+ svm_msg_q_shared_queue_t *sq = mq->q.shr;
+ i8 *tailp;
+ u32 sz;
+
+ tailp = (i8 *) (&sq->data[0] + sq->elsize * sq->tail);
+ clib_memcpy_fast (tailp, elem, sq->elsize);
+
+ sq->tail = (sq->tail + 1) % sq->maxsize;
+
+ sz = clib_atomic_fetch_add_rel (&sq->cursize, 1);
+ if (!sz)
+ svm_msg_q_send_signal (mq);
+}
+
int
svm_msg_q_add (svm_msg_q_t * mq, svm_msg_q_msg_t * msg, int nowait)
{
ASSERT (svm_msq_q_msg_is_valid (mq, msg));
- return svm_queue_add (mq->q, (u8 *) msg, nowait);
+
+ if (nowait)
+ {
+ /* zero on success */
+ if (svm_msg_q_try_lock (mq))
+ {
+ return (-1);
+ }
+ }
+ else
+ svm_msg_q_lock (mq);
+
+ if (PREDICT_FALSE (svm_msg_q_is_full (mq)))
+ {
+ if (nowait)
+ return (-2);
+ while (svm_msg_q_is_full (mq))
+ svm_msg_q_wait (mq);
+ }
+
+ svm_msg_q_add_raw (mq, (u8 *) msg);
+
+ svm_msg_q_unlock (mq);
+
+ return 0;
}
void
svm_msg_q_add_and_unlock (svm_msg_q_t * mq, svm_msg_q_msg_t * msg)
{
ASSERT (svm_msq_q_msg_is_valid (mq, msg));
- svm_queue_add_raw (mq->q, (u8 *) msg);
+ svm_msg_q_add_raw (mq, (u8 *) msg);
svm_msg_q_unlock (mq);
}
+static int
+svm_msg_q_sub_raw (svm_msg_q_t *mq, u8 *elem)
+{
+ svm_msg_q_shared_queue_t *sq = mq->q.shr;
+ i8 *headp;
+ u32 sz;
+
+ ASSERT (!svm_msg_q_is_empty (mq));
+
+ headp = (i8 *) (&sq->data[0] + sq->elsize * sq->head);
+ clib_memcpy_fast (elem, headp, sq->elsize);
+
+ sq->head = (sq->head + 1) % sq->maxsize;
+
+ sz = clib_atomic_fetch_sub_rel (&sq->cursize, 1);
+ if (PREDICT_FALSE (sz == sq->maxsize))
+ svm_msg_q_send_signal (mq);
+
+ return 0;
+}
+
int
svm_msg_q_sub (svm_msg_q_t * mq, svm_msg_q_msg_t * msg,
svm_q_conditional_wait_t cond, u32 time)
{
- return svm_queue_sub (mq->q, (u8 *) msg, cond, time);
+ int rc = 0;
+
+ if (cond == SVM_Q_NOWAIT)
+ {
+ /* zero on success */
+ if (svm_msg_q_try_lock (mq))
+ {
+ return (-1);
+ }
+ }
+ else
+ svm_msg_q_lock (mq);
+
+ if (PREDICT_FALSE (svm_msg_q_is_empty (mq)))
+ {
+ if (cond == SVM_Q_NOWAIT)
+ {
+ svm_msg_q_unlock (mq);
+ return (-2);
+ }
+ else if (cond == SVM_Q_TIMEDWAIT)
+ {
+ while (svm_msg_q_is_empty (mq) && rc == 0)
+ rc = svm_msg_q_timedwait (mq, time);
+
+ if (rc == ETIMEDOUT)
+ {
+ svm_msg_q_unlock (mq);
+ return ETIMEDOUT;
+ }
+ }
+ else
+ {
+ while (svm_msg_q_is_empty (mq))
+ svm_msg_q_wait (mq);
+ }
+ }
+
+ svm_msg_q_sub_raw (mq, (u8 *) msg);
+
+ svm_msg_q_unlock (mq);
+
+ return 0;
}
void
-svm_msg_q_sub_w_lock (svm_msg_q_t * mq, svm_msg_q_msg_t * msg)
+svm_msg_q_sub_w_lock (svm_msg_q_t *mq, svm_msg_q_msg_t *msg)
{
- svm_queue_sub_raw (mq->q, (u8 *) msg);
+ svm_msg_q_sub_raw (mq, (u8 *) msg);
+}
+
+void
+svm_msg_q_set_eventfd (svm_msg_q_t *mq, int fd)
+{
+ mq->q.evtfd = fd;
+}
+
+int
+svm_msg_q_alloc_eventfd (svm_msg_q_t *mq)
+{
+ int fd;
+ if ((fd = eventfd (0, EFD_NONBLOCK)) < 0)
+ return -1;
+ svm_msg_q_set_eventfd (mq, fd);
+ return 0;
+}
+
+void
+svm_msg_q_wait (svm_msg_q_t *mq)
+{
+ if (mq->q.evtfd == -1)
+ {
+ pthread_cond_wait (&mq->q.shr->condvar, &mq->q.shr->mutex);
+ }
+ else
+ {
+ u64 buf;
+ int rv;
+
+ svm_msg_q_unlock (mq);
+ while ((rv = read (mq->q.evtfd, &buf, sizeof (buf))) < 0)
+ {
+ if (errno != EAGAIN)
+ {
+ clib_unix_warning ("read error");
+ return;
+ }
+ }
+ svm_msg_q_lock (mq);
+ }
+}
+
+int
+svm_msg_q_timedwait (svm_msg_q_t *mq, double timeout)
+{
+ if (mq->q.evtfd == -1)
+ {
+ struct timespec ts;
+ ts.tv_sec = unix_time_now () + (u32) timeout;
+ ts.tv_nsec = (timeout - (u32) timeout) * 1e9;
+ return pthread_cond_timedwait (&mq->q.shr->condvar, &mq->q.shr->mutex,
+ &ts);
+ }
+ else
+ {
+ struct timeval tv;
+ u64 buf;
+ int rv;
+
+ tv.tv_sec = (u64) timeout;
+ tv.tv_usec = ((u64) timeout - (u64) timeout) * 1e9;
+ setsockopt (mq->q.evtfd, SOL_SOCKET, SO_RCVTIMEO, (const char *) &tv,
+ sizeof tv);
+
+ svm_msg_q_unlock (mq);
+ rv = read (mq->q.evtfd, &buf, sizeof (buf));
+ if (rv < 0)
+ clib_warning ("read %u", errno);
+ svm_msg_q_lock (mq);
+
+ return rv < 0 ? errno : 0;
+ }
+}
+
+u8 *
+format_svm_msg_q (u8 * s, va_list * args)
+{
+ svm_msg_q_t *mq = va_arg (*args, svm_msg_q_t *);
+ s = format (s, " [Q:%d/%d]", mq->q.shr->cursize, mq->q.shr->maxsize);
+ for (u32 i = 0; i < vec_len (mq->rings); i++)
+ {
+ s = format (s, " [R%d:%d/%d]", i, mq->rings[i].shr->cursize,
+ mq->rings[i].nitems);
+ }
+ return s;
}
/*
Code Review / vpp.git / blobdiff