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/*
* Copyright (c) 2016 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/svm_fifo_segment.h>
svm_fifo_segment_main_t svm_fifo_segment_main;
/** (master) create an svm fifo segment */
int
svm_fifo_segment_create (svm_fifo_segment_create_args_t * a)
{
int rv;
svm_fifo_segment_private_t *s;
svm_fifo_segment_main_t *sm = &svm_fifo_segment_main;
ssvm_shared_header_t *sh;
svm_fifo_segment_header_t *fsh;
void *oldheap;
/* Allocate a fresh segment */
pool_get (sm->segments, s);
memset (s, 0, sizeof (*s));
s->ssvm.ssvm_size = a->segment_size;
s->ssvm.i_am_master = 1;
s->ssvm.my_pid = getpid ();
s->ssvm.name = (u8 *) a->segment_name;
s->ssvm.requested_va = sm->next_baseva;
rv = ssvm_master_init (&s->ssvm, s - sm->segments);
if (rv)
{
_vec_len (s) = vec_len (s) - 1;
return (rv);
}
/* Note; requested_va updated due to seg base addr randomization */
sm->next_baseva = s->ssvm.requested_va + a->segment_size;
sh = s->ssvm.sh;
oldheap = ssvm_push_heap (sh);
/* Set up svm_fifo_segment shared header */
fsh = clib_mem_alloc (sizeof (*fsh));
memset (fsh, 0, sizeof (*fsh));
sh->opaque[0] = fsh;
s->h = fsh;
fsh->segment_name = format (0, "%s%c", a->segment_name, 0);
/* Avoid vec_add1(...) failure when adding a fifo, etc. */
vec_validate (fsh->fifos, 64);
_vec_len (fsh->fifos) = 0;
ssvm_pop_heap (oldheap);
sh->ready = 1;
a->new_segment_index = s - sm->segments;
return (0);
}
/** (slave) attach to an svm fifo segment */
int
svm_fifo_segment_attach (svm_fifo_segment_create_args_t * a)
{
int rv;
svm_fifo_segment_private_t *s;
svm_fifo_segment_main_t *sm = &svm_fifo_segment_main;
ssvm_shared_header_t *sh;
svm_fifo_segment_header_t *fsh;
/* Allocate a fresh segment */
pool_get (sm->segments, s);
memset (s, 0, sizeof (*s));
s->ssvm.ssvm_size = a->segment_size;
s->ssvm.my_pid = getpid ();
s->ssvm.name = (u8 *) a->segment_name;
s->ssvm.requested_va = sm->next_baseva;
rv = ssvm_slave_init (&s->ssvm, sm->timeout_in_seconds);
if (rv)
{
_vec_len (s) = vec_len (s) - 1;
return (rv);
}
/* Fish the segment header */
sh = s->ssvm.sh;
fsh = (svm_fifo_segment_header_t *) sh->opaque[0];
s->h = fsh;
a->new_segment_index = s - sm->segments;
return (0);
}
void
svm_fifo_segment_delete (svm_fifo_segment_private_t * s)
{
svm_fifo_segment_main_t *sm = &svm_fifo_segment_main;
ssvm_delete (&s->ssvm);
pool_put (sm->segments, s);
}
svm_fifo_t *
svm_fifo_segment_alloc_fifo (svm_fifo_segment_private_t * s,
u32 data_size_in_bytes)
{
ssvm_shared_header_t *sh;
svm_fifo_segment_header_t *fsh;
svm_fifo_t *f;
void *oldheap;
sh = s->ssvm.sh;
fsh = (svm_fifo_segment_header_t *) sh->opaque[0];
oldheap = ssvm_push_heap (sh);
/* Note: this can fail, in which case: create another segment */
f = svm_fifo_create (data_size_in_bytes);
if (f == 0)
{
ssvm_pop_heap (oldheap);
return (0);
}
vec_add1 (fsh->fifos, f);
ssvm_pop_heap (oldheap);
return (f);
}
void
svm_fifo_segment_free_fifo (svm_fifo_segment_private_t * s, svm_fifo_t * f)
{
ssvm_shared_header_t *sh;
svm_fifo_segment_header_t *fsh;
void *oldheap;
int i;
sh = s->ssvm.sh;
fsh = (svm_fifo_segment_header_t *) sh->opaque[0];
oldheap = ssvm_push_heap (sh);
for (i = 0; i < vec_len (fsh->fifos); i++)
{
if (fsh->fifos[i] == f)
{
vec_delete (fsh->fifos, 1, i);
goto found;
}
}
clib_warning ("fifo 0x%llx not found in fifo table...", f);
found:
clib_mem_free (f);
ssvm_pop_heap (oldheap);
}
void
svm_fifo_segment_init (u64 baseva, u32 timeout_in_seconds)
{
svm_fifo_segment_main_t *sm = &svm_fifo_segment_main;
sm->next_baseva = baseva;
sm->timeout_in_seconds = timeout_in_seconds;
}
u32
svm_fifo_segment_index (svm_fifo_segment_private_t * s)
{
return s - svm_fifo_segment_main.segments;
}
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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