Similar to the port mirroring function on the switch or router, this
patch also implements an ingress function on the Vhost lib. When
data is sent to a front-end, it will also send the data to its mirror
front-end.
Signed-off-by: Cheng Jiang <cheng1.ji...@intel.com>
Signed-off-by: Yuan Wang <yuanx.w...@intel.com>
Signed-off-by: Wenwu Ma <wenwux...@intel.com>
---
lib/vhost/rte_vhost_async.h | 6 +
lib/vhost/version.map | 1 +
lib/vhost/virtio_net.c | 688 ++++++++++++++++++++++++++++++++++++
3 files changed, 695 insertions(+)
diff --git a/lib/vhost/rte_vhost_async.h b/lib/vhost/rte_vhost_async.h
index 8f190dd44b..30aaf66b60 100644
--- a/lib/vhost/rte_vhost_async.h
+++ b/lib/vhost/rte_vhost_async.h
@@ -286,6 +286,12 @@ __rte_experimental
int
rte_vhost_async_dma_unconfigure(int16_t dma_id, uint16_t vchan_id);
+__rte_experimental
+uint16_t rte_vhost_async_try_egress_burst(int vid, uint16_t queue_id,
+ int mr_vid, uint16_t mr_queue_id,
+ struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t
count,
+ int *nr_inflight, int16_t dma_id, uint16_t vchan_id);
+
#ifdef __cplusplus
}
#endif
diff --git a/lib/vhost/version.map b/lib/vhost/version.map
index d322a4a888..95f75a6928 100644
--- a/lib/vhost/version.map
+++ b/lib/vhost/version.map
@@ -98,6 +98,7 @@ EXPERIMENTAL {
# added in 22.11
rte_vhost_async_dma_unconfigure;
rte_vhost_vring_call_nonblock;
+ rte_vhost_async_try_egress_burst;
};
INTERNAL {
diff --git a/lib/vhost/virtio_net.c b/lib/vhost/virtio_net.c
index be28ea5151..c7e99d403e 100644
--- a/lib/vhost/virtio_net.c
+++ b/lib/vhost/virtio_net.c
@@ -4262,3 +4262,691 @@ rte_vhost_async_try_dequeue_burst(int vid, uint16_t
queue_id,
return count;
}
+
+
+static __rte_always_inline uint16_t
+async_poll_egress_completed_split(struct virtio_net *dev, struct
vhost_virtqueue *vq,
+ struct virtio_net *mr_dev, struct vhost_virtqueue *mr_vq,
+ struct rte_mbuf **pkts, uint16_t count, int16_t dma_id,
+ uint16_t vchan_id, bool legacy_ol_flags)
+{
+ uint16_t nr_cpl_pkts = 0;
+ uint16_t start_idx, from, i;
+ struct async_inflight_info *pkts_info = vq->async->pkts_info;
+ uint16_t n_descs = 0;
+
+ vhost_async_dma_check_completed(dev, dma_id, vchan_id,
VHOST_DMA_MAX_COPY_COMPLETE);
+
+ start_idx = async_get_first_inflight_pkt_idx(vq);
+
+ from = start_idx;
+ while (vq->async->pkts_cmpl_flag[from] && count--) {
+ vq->async->pkts_cmpl_flag[from] = false;
+ from = (from + 1) % vq->size;
+ nr_cpl_pkts++;
+ }
+
+ if (nr_cpl_pkts == 0)
+ return 0;
+
+ for (i = 0; i < nr_cpl_pkts; i++) {
+ from = (start_idx + i) % vq->size;
+ n_descs += pkts_info[from].descs;
+ pkts[i] = pkts_info[from].mbuf;
+
+ if (virtio_net_with_host_offload(dev))
+ vhost_dequeue_offload(dev, &pkts_info[from].nethdr,
pkts[i],
+ legacy_ol_flags);
+ }
+
+ /* write back completed descs to used ring and update used idx */
+ write_back_completed_descs_split(vq, nr_cpl_pkts);
+ __atomic_add_fetch(&vq->used->idx, nr_cpl_pkts, __ATOMIC_RELEASE);
+ vhost_vring_call_split(dev, vq);
+
+ write_back_completed_descs_split(mr_vq, n_descs);
+ __atomic_add_fetch(&mr_vq->used->idx, n_descs, __ATOMIC_RELEASE);
+ vhost_vring_call_split(mr_dev, mr_vq);
+
+ vq->async->pkts_inflight_n -= nr_cpl_pkts;
+
+ return nr_cpl_pkts;
+}
+
+static __rte_always_inline int
+egress_async_fill_seg(struct virtio_net *dev, struct vhost_virtqueue *vq,
uint64_t buf_iova,
+ struct virtio_net *mr_dev, uint64_t mr_buf_iova,
+ struct rte_mbuf *m, uint32_t mbuf_offset, uint32_t cpy_len)
+{
+ struct vhost_async *async = vq->async;
+ uint64_t mapped_len, mr_mapped_len;
+ uint32_t buf_offset = 0;
+ void *src, *dst, *mr_dst;
+ void *host_iova, *mr_host_iova;
+
+ while (cpy_len) {
+ host_iova = (void *)(uintptr_t)gpa_to_first_hpa(dev,
+ buf_iova + buf_offset, cpy_len,
&mapped_len);
+ if (unlikely(!host_iova)) {
+ VHOST_LOG_DATA(dev->ifname, ERR, "%s: failed to get
host iova.\n", __func__);
+ return -1;
+ }
+
+ mr_host_iova = (void *)(uintptr_t)gpa_to_first_hpa(mr_dev,
+ mr_buf_iova + buf_offset, cpy_len,
&mr_mapped_len);
+ if (unlikely(!mr_host_iova)) {
+ VHOST_LOG_DATA(mr_dev->ifname, ERR, "%s: failed to get
mirror hpa.\n", __func__);
+ return -1;
+ }
+
+ if (unlikely(mr_mapped_len != mapped_len)) {
+ VHOST_LOG_DATA(dev->ifname, ERR, "original mapped len
is not equal to mirror len\n");
+ return -1;
+ }
+
+ src = host_iova;
+ dst = (void *)(uintptr_t)rte_pktmbuf_iova_offset(m,
mbuf_offset);
+
+ mr_dst = mr_host_iova;
+
+ if (unlikely(async_iter_add_iovec(dev, async, src, dst,
(size_t)mapped_len)))
+ return -1;
+
+ if (unlikely(async_iter_add_iovec(dev, async, src, mr_dst,
(size_t)mapped_len)))
+ return -1;
+
+ cpy_len -= (uint32_t)mapped_len;
+ mbuf_offset += (uint32_t)mapped_len;
+ buf_offset += (uint32_t)mapped_len;
+ }
+
+ return 0;
+}
+
+static __rte_always_inline int
+egress_async_desc_to_mbuf(struct virtio_net *dev, struct vhost_virtqueue *vq,
+ struct buf_vector *buf_vec, uint16_t nr_vec,
+ struct virtio_net *mr_dev, struct vhost_virtqueue *mr_vq,
+ struct buf_vector *mr_buf_vec, uint16_t mr_nr_vec, uint16_t
mr_num_buffers,
+ struct rte_mbuf *m, struct rte_mempool *mbuf_pool,
+ uint16_t slot_idx)
+{
+ uint64_t buf_iova;
+ uint32_t buf_avail, buf_offset, buf_len;
+ uint32_t mbuf_avail, mbuf_offset;
+ uint32_t hdr_remain = dev->vhost_hlen;
+ uint32_t cpy_len;
+ uint16_t vec_idx, mr_vec_idx = 0;
+ struct rte_mbuf *cur = m;
+ struct rte_mbuf *prev = m;
+ struct virtio_net_hdr tmp_hdr;
+ struct virtio_net_hdr *hdr = NULL;
+
+ uint64_t mr_buf_addr, mr_buf_iova;
+ uint32_t mr_buf_avail, mr_buf_offset, mr_buf_len;
+ struct virtio_net_hdr_mrg_rxbuf mr_tmp_hdr;
+ struct virtio_net_hdr_mrg_rxbuf *mr_hdr = NULL;
+ uint64_t mr_hdr_addr;
+
+ struct vhost_async *async = vq->async;
+ struct async_inflight_info *pkts_info;
+
+ /* original desc to mbuf */
+
+ /*
+ * The caller has checked the descriptors chain is larger than the
+ * header size.
+ */
+ if (virtio_net_with_host_offload(dev)) {
+ if (unlikely(buf_vec[0].buf_len < sizeof(struct
virtio_net_hdr))) {
+ /*
+ * No luck, the virtio-net header doesn't fit
+ * in a contiguous virtual area.
+ */
+ copy_vnet_hdr_from_desc(&tmp_hdr, buf_vec);
+ hdr = &tmp_hdr;
+ } else {
+ hdr = (struct virtio_net_hdr
*)((uintptr_t)buf_vec[0].buf_addr);
+ }
+ }
+
+ for (vec_idx = 0; vec_idx < nr_vec; vec_idx++) {
+ if (buf_vec[vec_idx].buf_len > hdr_remain)
+ break;
+
+ hdr_remain -= buf_vec[vec_idx].buf_len;
+ }
+
+ buf_len = buf_vec[vec_idx].buf_len;
+ buf_iova = buf_vec[vec_idx].buf_iova;
+ buf_offset = hdr_remain;
+ buf_avail = buf_vec[vec_idx].buf_len - hdr_remain;
+
+ /* original desc to mirror desc */
+
+ mr_buf_addr = mr_buf_vec[mr_vec_idx].buf_addr;
+ mr_buf_iova = mr_buf_vec[mr_vec_idx].buf_iova;
+ mr_buf_len = mr_buf_vec[mr_vec_idx].buf_len;
+
+ if (unlikely(mr_buf_len < mr_dev->vhost_hlen && mr_nr_vec <= 1))
+ return -1;
+
+ mr_hdr_addr = mr_buf_addr;
+
+ if (unlikely(mr_buf_len < mr_dev->vhost_hlen)) {
+ memset(&mr_tmp_hdr, 0, sizeof(struct virtio_net_hdr_mrg_rxbuf));
+ mr_hdr = &mr_tmp_hdr;
+ } else
+ mr_hdr = (struct virtio_net_hdr_mrg_rxbuf
*)(uintptr_t)mr_hdr_addr;
+
+ VHOST_LOG_DATA(mr_dev->ifname, DEBUG, "mirror port RX: num merge
buffers %d\n", mr_num_buffers);
+
+ if (unlikely(mr_buf_len < mr_dev->vhost_hlen)) {
+ mr_buf_offset = mr_dev->vhost_hlen - mr_buf_len;
+ mr_vec_idx++;
+ mr_buf_addr = mr_buf_vec[mr_vec_idx].buf_addr;
+ mr_buf_iova = mr_buf_vec[mr_vec_idx].buf_iova;
+ mr_buf_len = mr_buf_vec[mr_vec_idx].buf_len;
+ mr_buf_avail = mr_buf_len - mr_buf_offset;
+ } else {
+ mr_buf_offset = mr_dev->vhost_hlen;
+ mr_buf_avail = mr_buf_len - mr_dev->vhost_hlen;
+ }
+
+ rte_memcpy((void *)&mr_hdr->hdr, (void *)hdr, sizeof(struct
virtio_net_hdr));
+ if (rxvq_is_mergeable(mr_dev))
+ ASSIGN_UNLESS_EQUAL(mr_hdr->num_buffers, mr_num_buffers);
+ if (unlikely((uintptr_t)mr_hdr == (uintptr_t)&mr_tmp_hdr))
+ copy_vnet_hdr_to_desc(mr_dev, mr_vq, mr_buf_vec, mr_hdr);
+ else {
+ PRINT_PACKET(mr_dev, (uintptr_t)mr_buf_addr,
+ mr_dev->vhost_hlen, 0);
+ vhost_log_cache_write_iova(mr_dev, mr_vq,
+ mr_buf_vec[0].buf_iova,
+ mr_dev->vhost_hlen);
+ }
+
+ mbuf_offset = 0;
+ mbuf_avail = m->buf_len - RTE_PKTMBUF_HEADROOM;
+
+ pkts_info = async->pkts_info;
+ if (async_iter_initialize(dev, async))
+ return -1;
+
+ while (1) {
+ cpy_len = RTE_MIN(buf_avail, mbuf_avail);
+ cpy_len = RTE_MIN(cpy_len, mr_buf_avail);
+
+ if (egress_async_fill_seg(dev, vq, buf_iova + buf_offset,
+ mr_dev, mr_buf_iova + mr_buf_offset,
+ m, mbuf_offset, cpy_len) < 0)
+ goto error;
+
+ mbuf_avail -= cpy_len;
+ mbuf_offset += cpy_len;
+ buf_avail -= cpy_len;
+ buf_offset += cpy_len;
+ mr_buf_avail -= cpy_len;
+ mr_buf_offset += cpy_len;
+
+ /* This buf reaches to its end, get the next one */
+ if (buf_avail == 0) {
+ if (++vec_idx >= nr_vec)
+ break;
+
+ buf_iova = buf_vec[vec_idx].buf_iova;
+ buf_len = buf_vec[vec_idx].buf_len;
+
+ buf_offset = 0;
+ buf_avail = buf_len;
+ }
+
+ if (mr_buf_avail == 0) {
+ mr_vec_idx++;
+ if (unlikely(mr_vec_idx >= mr_nr_vec))
+ goto error;
+
+ mr_buf_addr = mr_buf_vec[mr_vec_idx].buf_addr;
+ mr_buf_iova = mr_buf_vec[mr_vec_idx].buf_iova;
+ mr_buf_len = mr_buf_vec[mr_vec_idx].buf_len;
+
+ mr_buf_offset = 0;
+ mr_buf_avail = mr_buf_len;
+ }
+
+ /*
+ * This mbuf reaches to its end, get a new one
+ * to hold more data.
+ */
+ if (mbuf_avail == 0) {
+ cur = rte_pktmbuf_alloc(mbuf_pool);
+ if (unlikely(cur == NULL)) {
+ VHOST_LOG_DATA(dev->ifname, ERR, "Failed to
allocate memory for mbuf.\n");
+ goto error;
+ }
+
+ prev->next = cur;
+ prev->data_len = mbuf_offset;
+ m->nb_segs += 1;
+ m->pkt_len += mbuf_offset;
+ prev = cur;
+
+ mbuf_offset = 0;
+ mbuf_avail = cur->buf_len - RTE_PKTMBUF_HEADROOM;
+ }
+ }
+
+ prev->data_len = mbuf_offset;
+ m->pkt_len += mbuf_offset;
+
+ async_iter_finalize(async);
+ if (hdr)
+ pkts_info[slot_idx].nethdr = *hdr;
+
+ return 0;
+
+error:
+ async_iter_cancel(async);
+
+ return -1;
+}
+
+static __rte_always_inline uint16_t
+virtio_mirror_dev_tx_async_split(struct virtio_net *dev, struct
vhost_virtqueue *vq,
+ struct virtio_net *mr_dev, struct vhost_virtqueue *mr_vq,
+ struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t
count,
+ uint16_t dma_id, uint16_t vchan_id, bool legacy_ol_flags)
+{
+ static bool allocerr_warned;
+ bool dropped = false;
+ uint16_t avail_entries;
+ uint16_t pkt_idx, slot_idx = 0;
+ uint16_t nr_done_pkts = 0;
+ uint16_t pkt_err = 0;
+ uint16_t n_xfer;
+ struct vhost_async *async = vq->async;
+ struct vhost_async *mr_async = mr_vq->async;
+ struct async_inflight_info *pkts_info = async->pkts_info;
+ struct rte_mbuf *pkts_prealloc[MAX_PKT_BURST];
+ struct buf_vector mr_buf_vec[BUF_VECTOR_MAX];
+ uint16_t mr_num_buffers;
+ uint16_t mr_avail_head;
+ uint16_t pkts_size = count;
+
+ /**
+ * The ordering between avail index and
+ * desc reads needs to be enforced.
+ */
+ avail_entries = __atomic_load_n(&vq->avail->idx, __ATOMIC_ACQUIRE) -
vq->last_avail_idx;
+ if (avail_entries == 0)
+ goto out;
+
+ rte_prefetch0(&vq->avail->ring[vq->last_avail_idx & (vq->size - 1)]);
+
+ mr_avail_head = __atomic_load_n(&mr_vq->avail->idx, __ATOMIC_ACQUIRE);
+ rte_prefetch0(&mr_vq->avail->ring[mr_vq->last_avail_idx & (mr_vq->size
- 1)]);
+
+ async_iter_reset(async);
+
+ count = RTE_MIN(count, MAX_PKT_BURST);
+ count = RTE_MIN(count, avail_entries);
+ VHOST_LOG_DATA(dev->ifname, DEBUG, "about to dequeue %u buffers\n",
count);
+
+ if (rte_pktmbuf_alloc_bulk(mbuf_pool, pkts_prealloc, count))
+ goto out;
+
+ for (pkt_idx = 0; pkt_idx < count; pkt_idx++) {
+ uint16_t head_idx = 0;
+ uint16_t nr_vec = 0;
+ uint16_t to;
+ uint32_t buf_len;
+ int err;
+ struct buf_vector buf_vec[BUF_VECTOR_MAX];
+ struct rte_mbuf *pkt = pkts_prealloc[pkt_idx];
+ uint16_t mr_nr_vec = 0;
+
+ if (unlikely(fill_vec_buf_split(dev, vq, vq->last_avail_idx,
+ &nr_vec, buf_vec,
+ &head_idx, &buf_len,
+ VHOST_ACCESS_RO) < 0)) {
+ dropped = true;
+ break;
+ }
+
+ if (unlikely(buf_len <= dev->vhost_hlen)) {
+ dropped = true;
+ break;
+ }
+
+ buf_len -= dev->vhost_hlen;
+
+ err = virtio_dev_pktmbuf_prep(dev, pkt, buf_len);
+ if (unlikely(err)) {
+ /**
+ * mbuf allocation fails for jumbo packets when external
+ * buffer allocation is not allowed and linear buffer
+ * is required. Drop this packet.
+ */
+ if (!allocerr_warned) {
+ VHOST_LOG_DATA(dev->ifname, ERR,
+ "Failed mbuf alloc of size %d from
%s.\n",
+ buf_len, mbuf_pool->name);
+ allocerr_warned = true;
+ }
+ dropped = true;
+ break;
+ }
+
+ if (unlikely(reserve_avail_buf_split(mr_dev, mr_vq,
+ buf_len, mr_buf_vec,
&mr_num_buffers,
+ mr_avail_head, &mr_nr_vec) <
0)) {
+ VHOST_LOG_DATA(mr_dev->ifname, DEBUG, "(%d) failed to
get enough desc from mirror vring\n", mr_dev->vid);
+ mr_vq->shadow_used_idx -= mr_num_buffers;
+ dropped = true;
+ break;
+ }
+
+ VHOST_LOG_DATA(mr_dev->ifname, DEBUG,
+ "mirror port current index %d | end index %d\n",
+ mr_vq->last_avail_idx, mr_vq->last_avail_idx +
mr_num_buffers);
+
+ slot_idx = (async->pkts_idx + pkt_idx) & (vq->size - 1);
+ err = egress_async_desc_to_mbuf(dev, vq, buf_vec, nr_vec,
+ mr_dev, mr_vq, mr_buf_vec, mr_nr_vec,
mr_num_buffers,
+ pkt, mbuf_pool, slot_idx);
+ if (unlikely(err)) {
+ if (!allocerr_warned) {
+ VHOST_LOG_DATA(dev->ifname, ERR, "Failed to
offload copies to async channel.\n");
+ allocerr_warned = true;
+ }
+ vq->shadow_used_idx -= mr_num_buffers;
+ dropped = true;
+ break;
+ }
+
+ pkts_info[slot_idx].mbuf = pkt;
+ pkts_info[slot_idx].descs = mr_num_buffers;
+
+ /* store used descs */
+ to = async->desc_idx_split & (vq->size - 1);
+ async->descs_split[to].id = head_idx;
+ async->descs_split[to].len = 0;
+ async->desc_idx_split++;
+
+ vq->last_avail_idx++;
+ mr_vq->last_avail_idx += mr_num_buffers;
+ }
+
+ if (unlikely(dropped))
+ rte_pktmbuf_free_bulk(&pkts_prealloc[pkt_idx], count - pkt_idx);
+
+ n_xfer = vhost_async_dma_transfer(dev, vq, dma_id, vchan_id,
async->pkts_idx,
+ async->iov_iter, pkt_idx);
+ async->pkts_inflight_n += n_xfer;
+
+ pkt_err = pkt_idx - n_xfer;
+ if (unlikely(pkt_err)) {
+ uint16_t num_descs = 0;
+
+ VHOST_LOG_DATA(dev->ifname, DEBUG,
+ "%s: failed to transfer %u packets for queue %u.\n",
+ __func__, pkt_err, vq->index);
+
+ /* update number of completed packets */
+ pkt_idx = n_xfer;
+
+ /* recover original vq available ring */
+ vq->last_avail_idx -= pkt_err;
+
+ /**
+ * recover async channel copy related structures.
+ */
+ async->desc_idx_split -= pkt_err;
+
+ /**
+ * calculate the sum of descriptors to revert and free pktmbufs
+ * for error pkts.
+ */
+ while (pkt_err-- > 0) {
+ rte_pktmbuf_free(pkts_info[slot_idx & (vq->size -
1)].mbuf);
+ num_descs += pkts_info[slot_idx & (vq->size - 1)].descs;
+ slot_idx--;
+ }
+
+ /* recover mirror vq shadow used ring and available ring */
+ mr_vq->shadow_used_idx -= num_descs;
+ mr_vq->last_avail_idx -= num_descs;
+ }
+
+ async->pkts_idx += pkt_idx;
+ if (async->pkts_idx >= vq->size)
+ async->pkts_idx -= vq->size;
+
+ /* keep used descriptors */
+ if (likely(mr_vq->shadow_used_idx)) {
+ uint16_t to = mr_async->desc_idx_split & (mr_vq->size - 1);
+
+ store_dma_desc_info_split(mr_vq->shadow_used_split,
+ mr_async->descs_split, mr_vq->size, 0, to,
+ mr_vq->shadow_used_idx);
+
+ mr_async->desc_idx_split += mr_vq->shadow_used_idx;
+
+ mr_async->pkts_idx += pkt_idx;
+ if (mr_async->pkts_idx >= mr_vq->size)
+ mr_async->pkts_idx -= pkt_idx;
+
+ mr_async->pkts_inflight_n += pkt_idx;
+ mr_vq->shadow_used_idx = 0;
+ }
+
+out:
+ /* DMA device may serve other queues, unconditionally check completed.
*/
+ nr_done_pkts = async_poll_egress_completed_split(dev, vq, mr_dev, mr_vq,
+ pkts, pkts_size,
+ dma_id, vchan_id,
legacy_ol_flags);
+
+ return nr_done_pkts;
+}
+
+__rte_noinline
+static uint16_t
+virtio_mirror_dev_tx_async_split_legacy(struct virtio_net *dev, struct
vhost_virtqueue *vq,
+ struct virtio_net *mr_dev, struct vhost_virtqueue *mr_vq,
+ struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t
count,
+ int16_t dma_id, uint16_t vchan_id)
+{
+ return virtio_mirror_dev_tx_async_split(dev, vq, mr_dev, mr_vq,
+ mbuf_pool, pkts, count, dma_id, vchan_id, true);
+}
+
+__rte_noinline
+static uint16_t
+virtio_mirror_dev_tx_async_split_compliant(struct virtio_net *dev, struct
vhost_virtqueue *vq,
+ struct virtio_net *mr_dev, struct vhost_virtqueue *mr_vq,
+ struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t
count,
+ int16_t dma_id, uint16_t vchan_id)
+{
+ return virtio_mirror_dev_tx_async_split(dev, vq, mr_dev, mr_vq,
+ mbuf_pool, pkts, count, dma_id, vchan_id,
false);
+}
+
+uint16_t
+rte_vhost_async_try_egress_burst(int vid, uint16_t queue_id,
+ int mr_vid, uint16_t mr_queue_id,
+ struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t
count,
+ int *nr_inflight, int16_t dma_id, uint16_t vchan_id)
+{
+ struct virtio_net *dev, *mr_dev;
+ struct rte_mbuf *rarp_mbuf = NULL;
+ struct vhost_virtqueue *vq, *mr_vq;
+ int16_t success = 1;
+
+ dev = get_device(vid);
+ mr_dev = get_device(mr_vid);
+ if (!dev || !mr_dev || !nr_inflight)
+ return 0;
+
+ *nr_inflight = -1;
+
+ if (unlikely(!(dev->flags & VIRTIO_DEV_BUILTIN_VIRTIO_NET))) {
+ VHOST_LOG_DATA(dev->ifname, ERR,
+ "(%d) %s: built-in vhost net backend is disabled.\n",
+ dev->vid, __func__);
+ return 0;
+ }
+
+ if (unlikely(!(mr_dev->flags & VIRTIO_DEV_BUILTIN_VIRTIO_NET))) {
+ VHOST_LOG_DATA(mr_dev->ifname, ERR,
+ "(%d) %s: built-in vhost net backend is disabled.\n",
+ mr_dev->vid, __func__);
+ return 0;
+ }
+
+ if (unlikely(!is_valid_virt_queue_idx(queue_id, 1, dev->nr_vring))) {
+ VHOST_LOG_DATA(dev->ifname, ERR,
+ "(%d) %s: invalid virtqueue idx %d.\n",
+ dev->vid, __func__, queue_id);
+ return 0;
+ }
+
+ if (unlikely(!is_valid_virt_queue_idx(mr_queue_id, 0,
mr_dev->nr_vring))) {
+ VHOST_LOG_DATA(mr_dev->ifname, ERR,
+ "(%d) %s: invalid virtqueue idx %d.\n",
+ mr_dev->vid, __func__, mr_queue_id);
+ return 0;
+ }
+
+ if (unlikely(dma_id < 0 || dma_id >= RTE_DMADEV_DEFAULT_MAX)) {
+ VHOST_LOG_DATA(dev->ifname, ERR, "%s: invalid dma id %d.\n",
+ __func__, dma_id);
+ return 0;
+ }
+
+ if (unlikely(!dma_copy_track[dma_id].vchans ||
+
!dma_copy_track[dma_id].vchans[vchan_id].pkts_cmpl_flag_addr)) {
+ VHOST_LOG_DATA(dev->ifname, ERR, "%s: invalid channel %d:%u.\n",
+ __func__, dma_id, vchan_id);
+ return 0;
+ }
+
+ vq = dev->virtqueue[queue_id];
+ mr_vq = mr_dev->virtqueue[mr_queue_id];
+
+ if (unlikely(rte_spinlock_trylock(&vq->access_lock) == 0) ||
+ unlikely(rte_spinlock_trylock(&mr_vq->access_lock) == 0))
+ return 0;
+
+ if (unlikely(vq->enabled == 0) || unlikely(mr_vq->enabled == 0)) {
+ count = 0;
+ goto out_access_unlock;
+ }
+
+ if (unlikely(vq->async == NULL)) {
+ VHOST_LOG_DATA(dev->ifname, ERR, "%s: async not registered for
queue id %d.\n",
+ __func__, queue_id);
+ count = 0;
+ goto out_access_unlock;
+ }
+
+ if (unlikely(mr_vq->async == NULL)) {
+ VHOST_LOG_DATA(mr_dev->ifname, ERR, "%s: async not registered
for queue id %d.\n",
+ __func__, mr_queue_id);
+ count = 0;
+ goto out_access_unlock;
+ }
+
+
+ if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
+ vhost_user_iotlb_rd_lock(vq);
+ if (mr_dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
+ vhost_user_iotlb_rd_lock(mr_vq);
+
+ if (unlikely(vq->access_ok == 0))
+ if (unlikely(vring_translate(dev, vq) < 0)) {
+ count = 0;
+ goto out;
+ }
+
+ if (unlikely(mr_vq->access_ok == 0))
+ if (unlikely(vring_translate(mr_dev, mr_vq) < 0)) {
+ count = 0;
+ goto out;
+ }
+
+ /*
+ * Construct a RARP broadcast packet, and inject it to the "pkts"
+ * array, to looks like that guest actually send such packet.
+ *
+ * Check user_send_rarp() for more information.
+ *
+ * broadcast_rarp shares a cacheline in the virtio_net structure
+ * with some fields that are accessed during enqueue and
+ * __atomic_compare_exchange_n causes a write if performed compare
+ * and exchange. This could result in false sharing between enqueue
+ * and dequeue.
+ *
+ * Prevent unnecessary false sharing by reading broadcast_rarp first
+ * and only performing compare and exchange if the read indicates it
+ * is likely to be set.
+ */
+ if (unlikely(__atomic_load_n(&dev->broadcast_rarp, __ATOMIC_ACQUIRE) &&
+ __atomic_compare_exchange_n(&dev->broadcast_rarp,
+ &success, 0, 0, __ATOMIC_RELEASE, __ATOMIC_RELAXED))) {
+
+ rarp_mbuf = rte_net_make_rarp_packet(mbuf_pool, &dev->mac);
+ if (rarp_mbuf == NULL) {
+ VHOST_LOG_DATA(dev->ifname, ERR, "Failed to make RARP
packet.\n");
+ count = 0;
+ goto out;
+ }
+ /*
+ * Inject it to the head of "pkts" array, so that switch's mac
+ * learning table will get updated first.
+ */
+ pkts[0] = rarp_mbuf;
+ vhost_queue_stats_update(dev, vq, pkts, 1);
+ pkts++;
+ count -= 1;
+ }
+
+ if (unlikely(vq_is_packed(dev))) {
+ VHOST_LOG_DATA(dev->ifname, ERR,
+ "(%d) %s: port does not support packed ring.\n",
+ dev->vid, __func__);
+ return 0;
+ }
+
+ if (unlikely(vq_is_packed(mr_dev))) {
+ VHOST_LOG_DATA(mr_dev->ifname, ERR,
+ "(%d) %s: mirror port does not support packed ring.\n",
+ mr_dev->vid, __func__);
+ return 0;
+ }
+
+ if (dev->flags & VIRTIO_DEV_LEGACY_OL_FLAGS)
+ count = virtio_mirror_dev_tx_async_split_legacy(dev, vq,
mr_dev, mr_vq,
+ mbuf_pool, pkts, count, dma_id, vchan_id);
+ else
+ count = virtio_mirror_dev_tx_async_split_compliant(dev, vq,
mr_dev, mr_vq,
+ mbuf_pool, pkts, count, dma_id, vchan_id);
+
+ *nr_inflight = vq->async->pkts_inflight_n;
+ vhost_queue_stats_update(dev, vq, pkts, count);
+ vhost_queue_stats_update(mr_dev, mr_vq, pkts, count);
+
+out:
+ if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
+ vhost_user_iotlb_rd_unlock(vq);
+ if (mr_dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
+ vhost_user_iotlb_rd_unlock(mr_vq);
+
+out_access_unlock:
+ rte_spinlock_unlock(&vq->access_lock);
+ rte_spinlock_unlock(&mr_vq->access_lock);
+
+ if (unlikely(rarp_mbuf != NULL))
+ count += 1;
+
+ return count;
+}
--
2.35.1
