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/*-
* BSD LICENSE
*
* Copyright(c) 2010-2015 Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdint.h>
#include <rte_mbuf.h>
#include "virtqueue.h"
#include "virtio_logs.h"
#include "virtio_pci.h"
/*
* Two types of mbuf to be cleaned:
* 1) mbuf that has been consumed by backend but not used by virtio.
* 2) mbuf that hasn't been consued by backend.
*/
struct rte_mbuf *
virtqueue_detatch_unused(struct virtqueue *vq)
{
struct rte_mbuf *cookie;
int idx;
if (vq != NULL)
for (idx = 0; idx < vq->vq_nentries; idx++) {
cookie = vq->vq_descx[idx].cookie;
if (cookie != NULL) {
vq->vq_descx[idx].cookie = NULL;
return cookie;
}
}
return NULL;
}
/* Flush the elements in the used ring. */
void
virtqueue_flush(struct virtqueue *vq)
{
struct vring_used_elem *uep;
struct vq_desc_extra *dxp;
uint16_t used_idx, desc_idx;
uint16_t nb_used, i;
nb_used = VIRTQUEUE_NUSED(vq);
for (i = 0; i < nb_used; i++) {
used_idx = vq->vq_used_cons_idx & (vq->vq_nentries - 1);
uep = &vq->vq_ring.used->ring[used_idx];
desc_idx = (uint16_t)uep->id;
dxp = &vq->vq_descx[desc_idx];
if (dxp->cookie != NULL) {
rte_pktmbuf_free(dxp->cookie);
dxp->cookie = NULL;
}
vq->vq_used_cons_idx++;
vq_ring_free_chain(vq, desc_idx);
}
}
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