1 /* SPDX-License-Identifier: BSD-3-Clause 2 * Copyright(c) 2010-2015 Intel Corporation 3 */ 4 #include <stdint.h> 5 6 #include <rte_mbuf.h> 7 8 #include "virtqueue.h" 9 #include "virtio_logs.h" 10 #include "virtio_pci.h" 11 12 /* 13 * Two types of mbuf to be cleaned: 14 * 1) mbuf that has been consumed by backend but not used by virtio. 15 * 2) mbuf that hasn't been consued by backend. 16 */ 17 struct rte_mbuf * 18 virtqueue_detatch_unused(struct virtqueue *vq) 19 { 20 struct rte_mbuf *cookie; 21 int idx; 22 23 if (vq != NULL) 24 for (idx = 0; idx < vq->vq_nentries; idx++) { 25 cookie = vq->vq_descx[idx].cookie; 26 if (cookie != NULL) { 27 vq->vq_descx[idx].cookie = NULL; 28 return cookie; 29 } 30 } 31 return NULL; 32 } 33 34 /* Flush the elements in the used ring. */ 35 void 36 virtqueue_flush(struct virtqueue *vq) 37 { 38 struct vring_used_elem *uep; 39 struct vq_desc_extra *dxp; 40 uint16_t used_idx, desc_idx; 41 uint16_t nb_used, i; 42 43 nb_used = VIRTQUEUE_NUSED(vq); 44 45 for (i = 0; i < nb_used; i++) { 46 used_idx = vq->vq_used_cons_idx & (vq->vq_nentries - 1); 47 uep = &vq->vq_ring.used->ring[used_idx]; 48 desc_idx = (uint16_t)uep->id; 49 dxp = &vq->vq_descx[desc_idx]; 50 if (dxp->cookie != NULL) { 51 rte_pktmbuf_free(dxp->cookie); 52 dxp->cookie = NULL; 53 } 54 vq->vq_used_cons_idx++; 55 vq_ring_free_chain(vq, desc_idx); 56 } 57 } 58