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/*
* Copyright (c) 2018 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <svm/message_queue.h>
#include <vppinfra/mem.h>
svm_msg_q_t *
svm_msg_q_alloc (svm_msg_q_cfg_t * cfg)
{
svm_msg_q_ring_t *ring;
svm_msg_q_t *mq;
uword size;
int i;
if (!cfg)
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);
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;
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);
}
}
return mq;
}
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);
clib_mem_free (mq);
}
svm_msg_q_msg_t
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_t *ring;
vec_foreach (ring, mq->rings)
{
if (ring->elsize < nbytes || ring->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);
break;
}
return msg;
}
static inline svm_msg_q_ring_t *
svm_msg_q_get_ring (svm_msg_q_t * mq, u32 ring_index)
{
return vec_elt_at_index (mq->rings, ring_index);
}
static inline void *
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);
}
void *
svm_msg_q_msg_data (svm_msg_q_t * mq, svm_msg_q_msg_t * msg)
{
svm_msg_q_ring_t *ring = svm_msg_q_get_ring (mq, msg->ring_index);
return svm_msg_q_ring_data (ring, msg->elt_index);
}
void
svm_msg_q_free_msg (svm_msg_q_t * mq, svm_msg_q_msg_t * msg)
{
svm_msg_q_ring_t *ring;
if (vec_len (mq->rings) <= msg->ring_index)
return;
ring = &mq->rings[msg->ring_index];
if (msg->elt_index == ring->head)
{
ring->head = (ring->head + 1) % ring->nitems;
}
else
{
/* for now, expect messages to be processed in order */
ASSERT (0);
}
__sync_fetch_and_sub (&ring->cursize, 1);
}
static int
svm_msq_q_msg_is_valid (svm_msg_q_t * mq, svm_msg_q_msg_t * msg)
{
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];
dist1 = ((ring->nitems + msg->ring_index) - ring->head) % ring->nitems;
if (ring->tail == ring->head)
dist2 = (ring->cursize == 0) ? 0 : ring->nitems;
else
dist2 = ((ring->nitems + ring->tail) - ring->head) % ring->nitems;
return (dist1 < dist2);
}
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);
}
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);
}
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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