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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.
*/
#ifndef included_ring_h
#define included_ring_h
#include <vppinfra/error.h>
#include <vppinfra/format.h>
#include <vppinfra/vec.h>
#include <vppinfra/vector.h>
typedef struct
{
u32 next, n_enq;
} clib_ring_header_t;
always_inline clib_ring_header_t *
clib_ring_header (void *v)
{
return vec_header (v);
}
always_inline void
clib_ring_new_inline (void **p, u32 elt_bytes, u32 size, u32 align)
{
void *v;
clib_ring_header_t *h;
v = _vec_resize ((void *) 0,
/* length increment */ size,
/* data bytes */ elt_bytes * size,
/* header bytes */ sizeof (h[0]),
/* data align */ align);
h = clib_ring_header (v);
h->next = 0;
h->n_enq = 0;
p[0] = v;
}
#define clib_ring_new_aligned(ring, size, align) \
{ clib_ring_new_inline ((void **)&(ring), sizeof(ring[0]), size, align); }
#define clib_ring_new(ring, size) \
{ clib_ring_new_inline ((void **)&(ring), sizeof(ring[0]), size, 0);}
#define clib_ring_free(f) vec_free_h((f), sizeof(clib_ring_header_t))
always_inline u32
clib_ring_n_enq (void *v)
{
clib_ring_header_t *h = clib_ring_header (v);
return h->n_enq;
}
always_inline void *
clib_ring_get_last_inline (void *v, u32 elt_bytes, int enqueue)
{
clib_ring_header_t *h = clib_ring_header (v);
u32 slot;
if (enqueue)
{
if (h->n_enq == _vec_len (v))
return 0;
slot = h->next;
h->n_enq++;
h->next++;
if (h->next == _vec_len (v))
h->next = 0;
}
else
{
if (h->n_enq == 0)
return 0;
slot = h->next == 0 ? _vec_len (v) - 1 : h->next - 1;
}
return (void *) ((u8 *) v + elt_bytes * slot);
}
#define clib_ring_enq(ring) \
clib_ring_get_last_inline (ring, sizeof(ring[0]), 1)
#define clib_ring_get_last(ring) \
clib_ring_get_last_inline (ring, sizeof(ring[0]), 0)
always_inline void *
clib_ring_get_first_inline (void *v, u32 elt_bytes, int dequeue)
{
clib_ring_header_t *h = clib_ring_header (v);
u32 slot;
if (h->n_enq == 0)
return 0;
if (h->n_enq > h->next)
slot = _vec_len (v) + h->next - h->n_enq;
else
slot = h->next - h->n_enq;
if (dequeue)
h->n_enq--;
return (void *) ((u8 *) v + elt_bytes * slot);
}
#define clib_ring_deq(ring) \
clib_ring_get_first_inline (ring, sizeof(ring[0]), 1)
#define clib_ring_get_first(ring) \
clib_ring_get_first_inline (ring, sizeof(ring[0]), 0)
#endif /* included_ring_h */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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