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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>
static inline svm_msg_q_ring_t *
svm_msg_q_ring_inline (svm_msg_q_t * mq, u32 ring_index)
{
return vec_elt_at_index (mq->rings, ring_index);
}
svm_msg_q_ring_t *
svm_msg_q_ring (svm_msg_q_t * mq, u32 ring_index)
{
return svm_msg_q_ring_inline (mq, 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);
}
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;
u32 vec_sz;
int i;
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 = (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
{
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;
}
void
svm_msg_q_free (svm_msg_q_t * mq)
{
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;
svm_msg_q_ring_t *ring = svm_msg_q_ring_inline (mq, ring_index);
ASSERT (ring->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);
return msg;
}
int
svm_msg_q_lock_and_alloc_msg_w_ring (svm_msg_q_t * mq, u32 ring_index,
u8 noblock, svm_msg_q_msg_t * msg)
{
if (noblock)
{
if (svm_msg_q_try_lock (mq))
return -1;
if (PREDICT_FALSE (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))
svm_msg_q_wait (mq);
*msg = svm_msg_q_alloc_msg_w_ring (mq, ring_index);
}
return 0;
}
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;
}
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_ring_inline (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)
{
u32 dist1, dist2, tail, head;
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;
dist1 = ((ring->nitems + msg->elt_index) - head) % ring->nitems;
if (tail == head)
dist2 = (ring->cursize == 0) ? 0 : ring->nitems;
else
dist2 = ((ring->nitems + tail) - 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);
}
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_unlock (mq);
}
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);
}
void
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);
}
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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