71 lines
2.5 KiB
C
71 lines
2.5 KiB
C
/*-
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* BSD LICENSE
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*
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* Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdint.h>
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#include <rte_mbuf.h>
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#include "virtqueue.h"
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#include "virtio_logs.h"
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#include "virtio_pci.h"
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void
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virtqueue_disable_intr(struct virtqueue *vq)
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{
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/*
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* Set VRING_AVAIL_F_NO_INTERRUPT to hint host
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* not to interrupt when it consumes packets
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* Note: this is only considered a hint to the host
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*/
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vq->vq_ring.avail->flags |= VRING_AVAIL_F_NO_INTERRUPT;
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}
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/*
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* Two types of mbuf to be cleaned:
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* 1) mbuf that has been consumed by backend but not used by virtio.
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* 2) mbuf that hasn't been consued by backend.
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*/
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struct rte_mbuf *
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virtqueue_detatch_unused(struct virtqueue *vq)
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{
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struct rte_mbuf *cookie;
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int idx;
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for(idx = 0; idx < vq->vq_nentries; idx++) {
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if ((cookie = vq->vq_descx[idx].cookie) != NULL) {
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vq->vq_descx[idx].cookie = NULL;
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return cookie;
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}
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}
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return (NULL);
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}
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