vcl: use events for epoll/select/read/write

[vpp.git] / src / svm / message_queue.c

diff --git a/src/svm/message_queue.c b/src/svm/message_queue.c
index 8941114..1b2d2e1 100644 (file)
--- a/src/svm/message_queue.c
+++ b/src/svm/message_queue.c
@@ -38,32 +38,52 @@ svm_msg_q_ring_data (svm_msg_q_ring_t * ring, u32 elt_index)
 svm_msg_q_t *
 svm_msg_q_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;
-  uword size;
+  u32 vec_sz;
   int i;
 
-  if (!cfg)
+  ASSERT (cfg);
+
+  vec_sz = vec_header_bytes (0) + sizeof (svm_msg_q_ring_t) * cfg->n_rings;
+  for (i = 0; i < cfg->n_rings; i++)
+    {
+      if (cfg->ring_cfgs[i].data)
+       continue;
+      ring_cfg = &cfg->ring_cfgs[i];
+      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);
+  if (!base)
     return 0;
 
-  mq = clib_mem_alloc_aligned (sizeof (svm_msg_q_t), CLIB_CACHE_LINE_BYTES);
-  memset (mq, 0, sizeof (*mq));
-  mq->q = svm_queue_init (cfg->q_nitems, sizeof (svm_msg_q_msg_t),
-                         cfg->consumer_pid, 0);
-  vec_validate (mq->rings, cfg->n_rings - 1);
+  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++)
     {
       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
        {
-         size = (uword) ring->nitems * ring->elsize;
-         ring->data = clib_mem_alloc_aligned (size, CLIB_CACHE_LINE_BYTES);
+         ring->data = rings_ptr;
+         rings_ptr += (uword) ring->nitems * ring->elsize;
        }
     }
+  mq->q = svm_queue_init (cfg->q_nitems, sizeof (svm_msg_q_msg_t),
+                         cfg->consumer_pid, 0);
 
   return mq;
 }
@@ -71,23 +91,17 @@ svm_msg_q_alloc (svm_msg_q_cfg_t * cfg)
 void
 svm_msg_q_free (svm_msg_q_t * mq)
 {
-  svm_msg_q_ring_t *ring;
-
-  vec_foreach (ring, mq->rings)
-  {
-    clib_mem_free (ring->data);
-  }
-  vec_free (mq->rings);
+  svm_queue_free (mq->q);
   clib_mem_free (mq);
 }
 
 svm_msg_q_msg_t
 svm_msg_q_alloc_msg_w_ring (svm_msg_q_t * mq, u32 ring_index)
 {
-  svm_msg_q_msg_t msg = {.as_u64 = ~0 };
+  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);
+  ASSERT (ring->cursize < ring->nitems);
   msg.ring_index = ring - mq->rings;
   msg.elt_index = ring->tail;
   ring->tail = (ring->tail + 1) % ring->nitems;
@@ -118,12 +132,9 @@ svm_msg_q_lock_and_alloc_msg_w_ring (svm_msg_q_t * mq, u32 ring_index,
   else
     {
       svm_msg_q_lock (mq);
+      while (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);
-      while (svm_msg_q_msg_is_invalid (msg))
-       {
-         svm_msg_q_wait (mq);
-         *msg = svm_msg_q_alloc_msg_w_ring (mq, ring_index);
-       }
     }
   return 0;
 }
@@ -177,18 +188,20 @@ svm_msg_q_free_msg (svm_msg_q_t * mq, svm_msg_q_msg_t * msg)
 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_t *ring;
-  u32 dist1, dist2;
 
   if (vec_len (mq->rings) <= msg->ring_index)
     return 0;
   ring = &mq->rings[msg->ring_index];
+  tail = ring->tail;
+  head = ring->head;
 
-  dist1 = ((ring->nitems + msg->elt_index) - ring->head) % ring->nitems;
-  if (ring->tail == ring->head)
+  dist1 = ((ring->nitems + msg->elt_index) - head) % ring->nitems;
+  if (tail == head)
     dist2 = (ring->cursize == 0) ? 0 : ring->nitems;
   else
-    dist2 = ((ring->nitems + ring->tail) - ring->head) % ring->nitems;
+    dist2 = ((ring->nitems + tail) - head) % ring->nitems;
   return (dist1 < dist2);
 }
 
@@ -200,10 +213,11 @@ svm_msg_q_add (svm_msg_q_t * mq, svm_msg_q_msg_t * msg, int nowait)
 }
 
 void
-svm_msg_q_add_w_lock (svm_msg_q_t * mq, svm_msg_q_msg_t * msg)
+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_unlock (mq);
 }
 
 int