#include <rte_arp.h>
#include <rte_spinlock.h>
#include <rte_malloc.h>
+#include <rte_vhost_async.h>
#include "iotlb.h"
#include "vhost.h"
-#define MAX_PKT_BURST 32
-
#define MAX_BATCH_LEN 256
+#define VHOST_ASYNC_BATCH_THRESHOLD 32
+
static __rte_always_inline bool
rxvq_is_mergeable(struct virtio_net *dev)
{
sizeof(vq->used->idx));
}
+static __rte_always_inline void
+async_flush_shadow_used_ring_split(struct virtio_net *dev,
+ struct vhost_virtqueue *vq)
+{
+ uint16_t used_idx = vq->last_used_idx & (vq->size - 1);
+
+ if (used_idx + vq->shadow_used_idx <= vq->size) {
+ do_flush_shadow_used_ring_split(dev, vq, used_idx, 0,
+ vq->shadow_used_idx);
+ } else {
+ uint16_t size;
+
+ /* update used ring interval [used_idx, vq->size] */
+ size = vq->size - used_idx;
+ do_flush_shadow_used_ring_split(dev, vq, used_idx, 0, size);
+
+ /* update the left half used ring interval [0, left_size] */
+ do_flush_shadow_used_ring_split(dev, vq, 0, size,
+ vq->shadow_used_idx - size);
+ }
+
+ vq->last_used_idx += vq->shadow_used_idx;
+ vq->shadow_used_idx = 0;
+}
+
static __rte_always_inline void
update_shadow_used_ring_split(struct vhost_virtqueue *vq,
uint16_t desc_idx, uint32_t len)
return error;
}
+static __rte_always_inline void
+async_fill_vec(struct iovec *v, void *base, size_t len)
+{
+ v->iov_base = base;
+ v->iov_len = len;
+}
+
+static __rte_always_inline void
+async_fill_iter(struct rte_vhost_iov_iter *it, size_t count,
+ struct iovec *vec, unsigned long nr_seg)
+{
+ it->offset = 0;
+ it->count = count;
+
+ if (count) {
+ it->iov = vec;
+ it->nr_segs = nr_seg;
+ } else {
+ it->iov = 0;
+ it->nr_segs = 0;
+ }
+}
+
+static __rte_always_inline void
+async_fill_desc(struct rte_vhost_async_desc *desc,
+ struct rte_vhost_iov_iter *src, struct rte_vhost_iov_iter *dst)
+{
+ desc->src = src;
+ desc->dst = dst;
+}
+
+static __rte_always_inline int
+async_mbuf_to_desc(struct virtio_net *dev, struct vhost_virtqueue *vq,
+ struct rte_mbuf *m, struct buf_vector *buf_vec,
+ uint16_t nr_vec, uint16_t num_buffers,
+ struct iovec *src_iovec, struct iovec *dst_iovec,
+ struct rte_vhost_iov_iter *src_it,
+ struct rte_vhost_iov_iter *dst_it)
+{
+ uint32_t vec_idx = 0;
+ uint32_t mbuf_offset, mbuf_avail;
+ uint32_t buf_offset, buf_avail;
+ uint64_t buf_addr, buf_iova, buf_len;
+ uint32_t cpy_len, cpy_threshold;
+ uint64_t hdr_addr;
+ struct rte_mbuf *hdr_mbuf;
+ struct batch_copy_elem *batch_copy = vq->batch_copy_elems;
+ struct virtio_net_hdr_mrg_rxbuf tmp_hdr, *hdr = NULL;
+ int error = 0;
+
+ uint32_t tlen = 0;
+ int tvec_idx = 0;
+ void *hpa;
+
+ if (unlikely(m == NULL)) {
+ error = -1;
+ goto out;
+ }
+
+ cpy_threshold = vq->async_threshold;
+
+ buf_addr = buf_vec[vec_idx].buf_addr;
+ buf_iova = buf_vec[vec_idx].buf_iova;
+ buf_len = buf_vec[vec_idx].buf_len;
+
+ if (unlikely(buf_len < dev->vhost_hlen && nr_vec <= 1)) {
+ error = -1;
+ goto out;
+ }
+
+ hdr_mbuf = m;
+ hdr_addr = buf_addr;
+ if (unlikely(buf_len < dev->vhost_hlen))
+ hdr = &tmp_hdr;
+ else
+ hdr = (struct virtio_net_hdr_mrg_rxbuf *)(uintptr_t)hdr_addr;
+
+ VHOST_LOG_DATA(DEBUG, "(%d) RX: num merge buffers %d\n",
+ dev->vid, num_buffers);
+
+ if (unlikely(buf_len < dev->vhost_hlen)) {
+ buf_offset = dev->vhost_hlen - buf_len;
+ vec_idx++;
+ buf_addr = buf_vec[vec_idx].buf_addr;
+ buf_iova = buf_vec[vec_idx].buf_iova;
+ buf_len = buf_vec[vec_idx].buf_len;
+ buf_avail = buf_len - buf_offset;
+ } else {
+ buf_offset = dev->vhost_hlen;
+ buf_avail = buf_len - dev->vhost_hlen;
+ }
+
+ mbuf_avail = rte_pktmbuf_data_len(m);
+ mbuf_offset = 0;
+
+ while (mbuf_avail != 0 || m->next != NULL) {
+ /* done with current buf, get the next one */
+ if (buf_avail == 0) {
+ vec_idx++;
+ if (unlikely(vec_idx >= nr_vec)) {
+ error = -1;
+ goto out;
+ }
+
+ buf_addr = buf_vec[vec_idx].buf_addr;
+ buf_iova = buf_vec[vec_idx].buf_iova;
+ buf_len = buf_vec[vec_idx].buf_len;
+
+ buf_offset = 0;
+ buf_avail = buf_len;
+ }
+
+ /* done with current mbuf, get the next one */
+ if (mbuf_avail == 0) {
+ m = m->next;
+
+ mbuf_offset = 0;
+ mbuf_avail = rte_pktmbuf_data_len(m);
+ }
+
+ if (hdr_addr) {
+ virtio_enqueue_offload(hdr_mbuf, &hdr->hdr);
+ if (rxvq_is_mergeable(dev))
+ ASSIGN_UNLESS_EQUAL(hdr->num_buffers,
+ num_buffers);
+
+ if (unlikely(hdr == &tmp_hdr)) {
+ copy_vnet_hdr_to_desc(dev, vq, buf_vec, hdr);
+ } else {
+ PRINT_PACKET(dev, (uintptr_t)hdr_addr,
+ dev->vhost_hlen, 0);
+ vhost_log_cache_write_iova(dev, vq,
+ buf_vec[0].buf_iova,
+ dev->vhost_hlen);
+ }
+
+ hdr_addr = 0;
+ }
+
+ cpy_len = RTE_MIN(buf_avail, mbuf_avail);
+
+ if (unlikely(cpy_len >= cpy_threshold)) {
+ hpa = (void *)(uintptr_t)gpa_to_hpa(dev,
+ buf_iova + buf_offset, cpy_len);
+
+ if (unlikely(!hpa)) {
+ error = -1;
+ goto out;
+ }
+
+ async_fill_vec(src_iovec + tvec_idx,
+ (void *)(uintptr_t)rte_pktmbuf_iova_offset(m,
+ mbuf_offset), cpy_len);
+
+ async_fill_vec(dst_iovec + tvec_idx, hpa, cpy_len);
+
+ tlen += cpy_len;
+ tvec_idx++;
+ } else {
+ if (unlikely(vq->batch_copy_nb_elems >= vq->size)) {
+ rte_memcpy(
+ (void *)((uintptr_t)(buf_addr + buf_offset)),
+ rte_pktmbuf_mtod_offset(m, void *, mbuf_offset),
+ cpy_len);
+
+ PRINT_PACKET(dev,
+ (uintptr_t)(buf_addr + buf_offset),
+ cpy_len, 0);
+ } else {
+ batch_copy[vq->batch_copy_nb_elems].dst =
+ (void *)((uintptr_t)(buf_addr + buf_offset));
+ batch_copy[vq->batch_copy_nb_elems].src =
+ rte_pktmbuf_mtod_offset(m, void *, mbuf_offset);
+ batch_copy[vq->batch_copy_nb_elems].log_addr =
+ buf_iova + buf_offset;
+ batch_copy[vq->batch_copy_nb_elems].len =
+ cpy_len;
+ vq->batch_copy_nb_elems++;
+ }
+ }
+
+ mbuf_avail -= cpy_len;
+ mbuf_offset += cpy_len;
+ buf_avail -= cpy_len;
+ buf_offset += cpy_len;
+ }
+
+out:
+ async_fill_iter(src_it, tlen, src_iovec, tvec_idx);
+ async_fill_iter(dst_it, tlen, dst_iovec, tvec_idx);
+
+ return error;
+}
+
static __rte_always_inline int
vhost_enqueue_single_packed(struct virtio_net *dev,
struct vhost_virtqueue *vq,
return virtio_dev_rx(dev, queue_id, pkts, count);
}
+static __rte_always_inline uint16_t
+virtio_dev_rx_async_get_info_idx(uint16_t pkts_idx,
+ uint16_t vq_size, uint16_t n_inflight)
+{
+ return pkts_idx > n_inflight ? (pkts_idx - n_inflight) :
+ (vq_size - n_inflight + pkts_idx) & (vq_size - 1);
+}
+
+static __rte_always_inline void
+virtio_dev_rx_async_submit_split_err(struct virtio_net *dev,
+ struct vhost_virtqueue *vq, uint16_t queue_id,
+ uint16_t last_idx, uint16_t shadow_idx)
+{
+ uint16_t start_idx, pkts_idx, vq_size;
+ uint64_t *async_pending_info;
+
+ pkts_idx = vq->async_pkts_idx;
+ async_pending_info = vq->async_pending_info;
+ vq_size = vq->size;
+ start_idx = virtio_dev_rx_async_get_info_idx(pkts_idx,
+ vq_size, vq->async_pkts_inflight_n);
+
+ while (likely((start_idx & (vq_size - 1)) != pkts_idx)) {
+ uint64_t n_seg =
+ async_pending_info[(start_idx) & (vq_size - 1)] >>
+ ASYNC_PENDING_INFO_N_SFT;
+
+ while (n_seg)
+ n_seg -= vq->async_ops.check_completed_copies(dev->vid,
+ queue_id, 0, 1);
+ }
+
+ vq->async_pkts_inflight_n = 0;
+ vq->batch_copy_nb_elems = 0;
+
+ vq->shadow_used_idx = shadow_idx;
+ vq->last_avail_idx = last_idx;
+}
+
+static __rte_noinline uint32_t
+virtio_dev_rx_async_submit_split(struct virtio_net *dev,
+ struct vhost_virtqueue *vq, uint16_t queue_id,
+ struct rte_mbuf **pkts, uint32_t count)
+{
+ uint32_t pkt_idx = 0, pkt_burst_idx = 0;
+ uint16_t num_buffers;
+ struct buf_vector buf_vec[BUF_VECTOR_MAX];
+ uint16_t avail_head, last_idx, shadow_idx;
+
+ struct rte_vhost_iov_iter *it_pool = vq->it_pool;
+ struct iovec *vec_pool = vq->vec_pool;
+ struct rte_vhost_async_desc tdes[MAX_PKT_BURST];
+ struct iovec *src_iovec = vec_pool;
+ struct iovec *dst_iovec = vec_pool + (VHOST_MAX_ASYNC_VEC >> 1);
+ struct rte_vhost_iov_iter *src_it = it_pool;
+ struct rte_vhost_iov_iter *dst_it = it_pool + 1;
+ uint16_t n_free_slot, slot_idx;
+ int n_pkts = 0;
+
+ avail_head = __atomic_load_n(&vq->avail->idx, __ATOMIC_ACQUIRE);
+ last_idx = vq->last_avail_idx;
+ shadow_idx = vq->shadow_used_idx;
+
+ /*
+ * The ordering between avail index and
+ * desc reads needs to be enforced.
+ */
+ rte_smp_rmb();
+
+ rte_prefetch0(&vq->avail->ring[vq->last_avail_idx & (vq->size - 1)]);
+
+ for (pkt_idx = 0; pkt_idx < count; pkt_idx++) {
+ uint32_t pkt_len = pkts[pkt_idx]->pkt_len + dev->vhost_hlen;
+ uint16_t nr_vec = 0;
+
+ if (unlikely(reserve_avail_buf_split(dev, vq,
+ pkt_len, buf_vec, &num_buffers,
+ avail_head, &nr_vec) < 0)) {
+ VHOST_LOG_DATA(DEBUG,
+ "(%d) failed to get enough desc from vring\n",
+ dev->vid);
+ vq->shadow_used_idx -= num_buffers;
+ break;
+ }
+
+ VHOST_LOG_DATA(DEBUG, "(%d) current index %d | end index %d\n",
+ dev->vid, vq->last_avail_idx,
+ vq->last_avail_idx + num_buffers);
+
+ if (async_mbuf_to_desc(dev, vq, pkts[pkt_idx],
+ buf_vec, nr_vec, num_buffers,
+ src_iovec, dst_iovec, src_it, dst_it) < 0) {
+ vq->shadow_used_idx -= num_buffers;
+ break;
+ }
+
+ slot_idx = (vq->async_pkts_idx + pkt_idx) & (vq->size - 1);
+ if (src_it->count) {
+ async_fill_desc(&tdes[pkt_burst_idx], src_it, dst_it);
+ pkt_burst_idx++;
+ vq->async_pending_info[slot_idx] =
+ num_buffers | (src_it->nr_segs << 16);
+ src_iovec += src_it->nr_segs;
+ dst_iovec += dst_it->nr_segs;
+ src_it += 2;
+ dst_it += 2;
+ } else {
+ vq->async_pending_info[slot_idx] = num_buffers;
+ vq->async_pkts_inflight_n++;
+ }
+
+ vq->last_avail_idx += num_buffers;
+
+ if (pkt_burst_idx >= VHOST_ASYNC_BATCH_THRESHOLD ||
+ (pkt_idx == count - 1 && pkt_burst_idx)) {
+ n_pkts = vq->async_ops.transfer_data(dev->vid,
+ queue_id, tdes, 0, pkt_burst_idx);
+ src_iovec = vec_pool;
+ dst_iovec = vec_pool + (VHOST_MAX_ASYNC_VEC >> 1);
+ src_it = it_pool;
+ dst_it = it_pool + 1;
+
+ if (unlikely(n_pkts < (int)pkt_burst_idx)) {
+ vq->async_pkts_inflight_n +=
+ n_pkts > 0 ? n_pkts : 0;
+ virtio_dev_rx_async_submit_split_err(dev,
+ vq, queue_id, last_idx, shadow_idx);
+ return 0;
+ }
+
+ pkt_burst_idx = 0;
+ vq->async_pkts_inflight_n += n_pkts;
+ }
+ }
+
+ if (pkt_burst_idx) {
+ n_pkts = vq->async_ops.transfer_data(dev->vid,
+ queue_id, tdes, 0, pkt_burst_idx);
+ if (unlikely(n_pkts < (int)pkt_burst_idx)) {
+ vq->async_pkts_inflight_n += n_pkts > 0 ? n_pkts : 0;
+ virtio_dev_rx_async_submit_split_err(dev, vq, queue_id,
+ last_idx, shadow_idx);
+ return 0;
+ }
+
+ vq->async_pkts_inflight_n += n_pkts;
+ }
+
+ do_data_copy_enqueue(dev, vq);
+
+ n_free_slot = vq->size - vq->async_pkts_idx;
+ if (n_free_slot > pkt_idx) {
+ rte_memcpy(&vq->async_pkts_pending[vq->async_pkts_idx],
+ pkts, pkt_idx * sizeof(uintptr_t));
+ vq->async_pkts_idx += pkt_idx;
+ } else {
+ rte_memcpy(&vq->async_pkts_pending[vq->async_pkts_idx],
+ pkts, n_free_slot * sizeof(uintptr_t));
+ rte_memcpy(&vq->async_pkts_pending[0],
+ &pkts[n_free_slot],
+ (pkt_idx - n_free_slot) * sizeof(uintptr_t));
+ vq->async_pkts_idx = pkt_idx - n_free_slot;
+ }
+
+ if (likely(vq->shadow_used_idx))
+ async_flush_shadow_used_ring_split(dev, vq);
+
+ return pkt_idx;
+}
+
+uint16_t rte_vhost_poll_enqueue_completed(int vid, uint16_t queue_id,
+ struct rte_mbuf **pkts, uint16_t count)
+{
+ struct virtio_net *dev = get_device(vid);
+ struct vhost_virtqueue *vq;
+ uint16_t n_pkts_cpl, n_pkts_put = 0, n_descs = 0;
+ uint16_t start_idx, pkts_idx, vq_size;
+ uint64_t *async_pending_info;
+
+ VHOST_LOG_DATA(DEBUG, "(%d) %s\n", dev->vid, __func__);
+ if (unlikely(!is_valid_virt_queue_idx(queue_id, 0, dev->nr_vring))) {
+ VHOST_LOG_DATA(ERR, "(%d) %s: invalid virtqueue idx %d.\n",
+ dev->vid, __func__, queue_id);
+ return 0;
+ }
+
+ vq = dev->virtqueue[queue_id];
+
+ rte_spinlock_lock(&vq->access_lock);
+
+ pkts_idx = vq->async_pkts_idx;
+ async_pending_info = vq->async_pending_info;
+ vq_size = vq->size;
+ start_idx = virtio_dev_rx_async_get_info_idx(pkts_idx,
+ vq_size, vq->async_pkts_inflight_n);
+
+ n_pkts_cpl =
+ vq->async_ops.check_completed_copies(vid, queue_id, 0, count);
+
+ rte_smp_wmb();
+
+ while (likely(((start_idx + n_pkts_put) & (vq_size - 1)) != pkts_idx)) {
+ uint64_t info = async_pending_info[
+ (start_idx + n_pkts_put) & (vq_size - 1)];
+ uint64_t n_segs;
+ n_pkts_put++;
+ n_descs += info & ASYNC_PENDING_INFO_N_MSK;
+ n_segs = info >> ASYNC_PENDING_INFO_N_SFT;
+
+ if (n_segs) {
+ if (!n_pkts_cpl || n_pkts_cpl < n_segs) {
+ n_pkts_put--;
+ n_descs -= info & ASYNC_PENDING_INFO_N_MSK;
+ if (n_pkts_cpl) {
+ async_pending_info[
+ (start_idx + n_pkts_put) &
+ (vq_size - 1)] =
+ ((n_segs - n_pkts_cpl) <<
+ ASYNC_PENDING_INFO_N_SFT) |
+ (info & ASYNC_PENDING_INFO_N_MSK);
+ n_pkts_cpl = 0;
+ }
+ break;
+ }
+ n_pkts_cpl -= n_segs;
+ }
+ }
+
+ if (n_pkts_put) {
+ vq->async_pkts_inflight_n -= n_pkts_put;
+ __atomic_add_fetch(&vq->used->idx, n_descs, __ATOMIC_RELEASE);
+
+ vhost_vring_call_split(dev, vq);
+ }
+
+ if (start_idx + n_pkts_put <= vq_size) {
+ rte_memcpy(pkts, &vq->async_pkts_pending[start_idx],
+ n_pkts_put * sizeof(uintptr_t));
+ } else {
+ rte_memcpy(pkts, &vq->async_pkts_pending[start_idx],
+ (vq_size - start_idx) * sizeof(uintptr_t));
+ rte_memcpy(&pkts[vq_size - start_idx], vq->async_pkts_pending,
+ (n_pkts_put - vq_size + start_idx) * sizeof(uintptr_t));
+ }
+
+ rte_spinlock_unlock(&vq->access_lock);
+
+ return n_pkts_put;
+}
+
+static __rte_always_inline uint32_t
+virtio_dev_rx_async_submit(struct virtio_net *dev, uint16_t queue_id,
+ struct rte_mbuf **pkts, uint32_t count)
+{
+ struct vhost_virtqueue *vq;
+ uint32_t nb_tx = 0;
+ bool drawback = false;
+
+ VHOST_LOG_DATA(DEBUG, "(%d) %s\n", dev->vid, __func__);
+ if (unlikely(!is_valid_virt_queue_idx(queue_id, 0, dev->nr_vring))) {
+ VHOST_LOG_DATA(ERR, "(%d) %s: invalid virtqueue idx %d.\n",
+ dev->vid, __func__, queue_id);
+ return 0;
+ }
+
+ vq = dev->virtqueue[queue_id];
+
+ rte_spinlock_lock(&vq->access_lock);
+
+ if (unlikely(vq->enabled == 0))
+ goto out_access_unlock;
+
+ if (unlikely(!vq->async_registered)) {
+ drawback = true;
+ goto out_access_unlock;
+ }
+
+ if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
+ vhost_user_iotlb_rd_lock(vq);
+
+ if (unlikely(vq->access_ok == 0))
+ if (unlikely(vring_translate(dev, vq) < 0))
+ goto out;
+
+ count = RTE_MIN((uint32_t)MAX_PKT_BURST, count);
+ if (count == 0)
+ goto out;
+
+ /* TODO: packed queue not implemented */
+ if (vq_is_packed(dev))
+ nb_tx = 0;
+ else
+ nb_tx = virtio_dev_rx_async_submit_split(dev,
+ vq, queue_id, pkts, count);
+
+out:
+ if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
+ vhost_user_iotlb_rd_unlock(vq);
+
+out_access_unlock:
+ rte_spinlock_unlock(&vq->access_lock);
+
+ if (drawback)
+ return rte_vhost_enqueue_burst(dev->vid, queue_id, pkts, count);
+
+ return nb_tx;
+}
+
+uint16_t
+rte_vhost_submit_enqueue_burst(int vid, uint16_t queue_id,
+ struct rte_mbuf **pkts, uint16_t count)
+{
+ struct virtio_net *dev = get_device(vid);
+
+ if (!dev)
+ return 0;
+
+ if (unlikely(!(dev->flags & VIRTIO_DEV_BUILTIN_VIRTIO_NET))) {
+ VHOST_LOG_DATA(ERR,
+ "(%d) %s: built-in vhost net backend is disabled.\n",
+ dev->vid, __func__);
+ return 0;
+ }
+
+ return virtio_dev_rx_async_submit(dev, queue_id, pkts, count);
+}
+
static inline bool
virtio_net_with_host_offload(struct virtio_net *dev)
{
git.droids-corp.org / dpdk.git / commitdiff