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/*
* Copyright (c) 2018, 2019 Nicira, Inc.
*
* 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 <config.h>
#include <errno.h>
#include "dp-packet.h"
#include "netdev-afxdp-pool.h"
#include "openvswitch/util.h"
/* Note:
* umem_elem_push* shouldn't overflow because we always pop
* elem first, then push back to the stack.
*/
static inline void
umem_elem_push_n__(struct umem_pool *umemp, int n, void **addrs)
{
void *ptr;
ovs_assert(umemp->index + n <= umemp->size);
ptr = &umemp->array[umemp->index];
memcpy(ptr, addrs, n * sizeof(void *));
umemp->index += n;
}
void umem_elem_push_n(struct umem_pool *umemp, int n, void **addrs)
{
ovs_spin_lock(&umemp->lock);
umem_elem_push_n__(umemp, n, addrs);
ovs_spin_unlock(&umemp->lock);
}
static inline void
umem_elem_push__(struct umem_pool *umemp, void *addr)
{
ovs_assert(umemp->index + 1 <= umemp->size);
umemp->array[umemp->index++] = addr;
}
void
umem_elem_push(struct umem_pool *umemp, void *addr)
{
ovs_spin_lock(&umemp->lock);
umem_elem_push__(umemp, addr);
ovs_spin_unlock(&umemp->lock);
}
static inline int
umem_elem_pop_n__(struct umem_pool *umemp, int n, void **addrs)
{
void *ptr;
if (OVS_UNLIKELY(umemp->index - n < 0)) {
return -ENOMEM;
}
umemp->index -= n;
ptr = &umemp->array[umemp->index];
memcpy(addrs, ptr, n * sizeof(void *));
return 0;
}
int
umem_elem_pop_n(struct umem_pool *umemp, int n, void **addrs)
{
int ret;
ovs_spin_lock(&umemp->lock);
ret = umem_elem_pop_n__(umemp, n, addrs);
ovs_spin_unlock(&umemp->lock);
return ret;
}
static inline void *
umem_elem_pop__(struct umem_pool *umemp)
{
if (OVS_UNLIKELY(umemp->index - 1 < 0)) {
return NULL;
}
return umemp->array[--umemp->index];
}
void *
umem_elem_pop(struct umem_pool *umemp)
{
void *ptr;
ovs_spin_lock(&umemp->lock);
ptr = umem_elem_pop__(umemp);
ovs_spin_unlock(&umemp->lock);
return ptr;
}
static void **
umem_pool_alloc__(unsigned int size)
{
void **bufs;
bufs = xmalloc_pagealign(size * sizeof *bufs);
memset(bufs, 0, size * sizeof *bufs);
return bufs;
}
int
umem_pool_init(struct umem_pool *umemp, unsigned int size)
{
umemp->array = umem_pool_alloc__(size);
if (!umemp->array) {
return -ENOMEM;
}
umemp->size = size;
umemp->index = 0;
ovs_spin_init(&umemp->lock);
return 0;
}
void
umem_pool_cleanup(struct umem_pool *umemp)
{
free_pagealign(umemp->array);
umemp->array = NULL;
ovs_spin_destroy(&umemp->lock);
}
unsigned int
umem_pool_count(struct umem_pool *umemp)
{
return umemp->index;
}
/* AF_XDP metadata init/destroy. */
int
xpacket_pool_init(struct xpacket_pool *xp, unsigned int size)
{
xp->array = xmalloc_pagealign(size * sizeof *xp->array);
xp->size = size;
memset(xp->array, 0, size * sizeof *xp->array);
return 0;
}
void
xpacket_pool_cleanup(struct xpacket_pool *xp)
{
free_pagealign(xp->array);
xp->array = NULL;
}
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