Add burst dequeue function like enqueue function for packed ring, burst
dequeue function will not support chained descritpors, single packet
dequeue function will handle it.
Signed-off-by: Marvin Liu <yong....@intel.com>
diff --git a/lib/librte_vhost/vhost.h b/lib/librte_vhost/vhost.h
index 67889c80a..9fa3c8adf 100644
--- a/lib/librte_vhost/vhost.h
+++ b/lib/librte_vhost/vhost.h
@@ -61,6 +61,7 @@
#endif
#define PACKED_BURST_MASK (PACKED_DESCS_BURST - 1)
+#define DESC_SINGLE_DEQUEUE (VRING_DESC_F_NEXT | VRING_DESC_F_INDIRECT)
/**
* Structure contains buffer address, length and descriptor index
diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
index 047fa7dc8..23c0f4685 100644
--- a/lib/librte_vhost/virtio_net.c
+++ b/lib/librte_vhost/virtio_net.c
@@ -1580,6 +1580,121 @@ virtio_dev_tx_split(struct virtio_net *dev, struct
vhost_virtqueue *vq,
return i;
}
+static __rte_always_inline int
+vhost_dequeue_burst_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
+ struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts,
+ uint16_t avail_idx, uintptr_t *desc_addrs, uint16_t *ids)
+{
+ bool wrap_counter = vq->avail_wrap_counter;
+ struct vring_packed_desc *descs = vq->desc_packed;
+ uint64_t lens[PACKED_DESCS_BURST];
+ uint64_t buf_lens[PACKED_DESCS_BURST];
+ uint32_t buf_offset = dev->vhost_hlen;
+ uint16_t i;
+
+ if (unlikely(avail_idx & PACKED_BURST_MASK))
+ return -1;
+
+ UNROLL_PRAGMA(PRAGMA_PARAM)
+ for (i = 0; i < PACKED_DESCS_BURST; i++) {
+ if (unlikely(!desc_is_avail(&descs[avail_idx + i],
+ wrap_counter)))
+ return -1;
+ if (unlikely(descs[avail_idx + i].flags &
+ DESC_SINGLE_DEQUEUE))
+ return -1;
+ }
+
+ rte_smp_rmb();
+
+ UNROLL_PRAGMA(PRAGMA_PARAM)
+ for (i = 0; i < PACKED_DESCS_BURST; i++)
+ lens[i] = descs[avail_idx + i].len;
+
+ UNROLL_PRAGMA(PRAGMA_PARAM)
+ for (i = 0; i < PACKED_DESCS_BURST; i++) {
+ desc_addrs[i] = vhost_iova_to_vva(dev, vq,
+ descs[avail_idx + i].addr,
+ &lens[i], VHOST_ACCESS_RW);
+ }
+
+ UNROLL_PRAGMA(PRAGMA_PARAM)
+ for (i = 0; i < PACKED_DESCS_BURST; i++) {
+ if (unlikely((lens[i] != descs[avail_idx + i].len)))
+ return -1;
+ }
+
+ if (rte_pktmbuf_alloc_bulk(mbuf_pool, pkts, PACKED_DESCS_BURST))
+ return -1;
+
+ UNROLL_PRAGMA(PRAGMA_PARAM)
+ for (i = 0; i < PACKED_DESCS_BURST; i++)
+ buf_lens[i] = pkts[i]->buf_len - pkts[i]->data_off;
+
+ UNROLL_PRAGMA(PRAGMA_PARAM)
+ for (i = 0; i < PACKED_DESCS_BURST; i++) {
+ if (unlikely(buf_lens[i] < (lens[i] - buf_offset)))
+ goto free_buf;
+ }
+
+ UNROLL_PRAGMA(PRAGMA_PARAM)
+ for (i = 0; i < PACKED_DESCS_BURST; i++) {
+ pkts[i]->pkt_len = descs[avail_idx + i].len - buf_offset;
+ pkts[i]->data_len = pkts[i]->pkt_len;
+ ids[i] = descs[avail_idx + i].id;
+ }
+
+ return 0;
+
+free_buf:
+ for (i = 0; i < PACKED_DESCS_BURST; i++)
+ rte_pktmbuf_free(pkts[i]);
+
+ return -1;
+}
+
+static __rte_unused int
+virtio_dev_tx_burst_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
+ struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts)
+{
+ uint16_t avail_idx = vq->last_avail_idx;
+ uint32_t buf_offset = dev->vhost_hlen;
+ uintptr_t desc_addrs[PACKED_DESCS_BURST];
+ uint16_t ids[PACKED_DESCS_BURST];
+ int ret;
+ struct virtio_net_hdr *hdr;
+ uint16_t i;
+
+ ret = vhost_dequeue_burst_packed(dev, vq, mbuf_pool, pkts, avail_idx,
+ desc_addrs, ids);
+
+ if (ret)
+ return ret;
+
+ UNROLL_PRAGMA(PRAGMA_PARAM)
+ for (i = 0; i < PACKED_DESCS_BURST; i++) {
+ rte_prefetch0((void *)(uintptr_t)desc_addrs[i]);
+ rte_memcpy(rte_pktmbuf_mtod_offset(pkts[i], void *, 0),
+ (void *)(uintptr_t)(desc_addrs[i] + buf_offset),
+ pkts[i]->pkt_len);
+ }
+
+ if (virtio_net_with_host_offload(dev)) {
+ UNROLL_PRAGMA(PRAGMA_PARAM)
+ for (i = 0; i < PACKED_DESCS_BURST; i++) {
+ hdr = (struct virtio_net_hdr *)(desc_addrs[i]);
+ vhost_dequeue_offload(hdr, pkts[i]);
+ }
+ }
+
+ vq->last_avail_idx += PACKED_DESCS_BURST;
+ if (vq->last_avail_idx >= vq->size) {
+ vq->last_avail_idx -= vq->size;
+ vq->avail_wrap_counter ^= 1;
+ }
+ return 0;
+}
+
static __rte_always_inline int
vhost_dequeue_single_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t *buf_id,
--
2.17.1
