vhost_poll_enqueue_completed() assumes some inflight
packets could have been completed in a previous call but
not returned to the application. But this is not the case,
since check_completed_copies callback is never called with
more than the current count as argument.
In other words, async->last_pkts_n is always 0. Removing it
greatly simplfies the function.
Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---
lib/vhost/vhost.h | 1 -
lib/vhost/virtio_net.c | 76 ++++++++++++++++--------------------------
2 files changed, 28 insertions(+), 49 deletions(-)
@@ -141,7 +141,6 @@ struct vhost_async {
struct async_inflight_info *pkts_info;
uint16_t pkts_idx;
uint16_t pkts_inflight_n;
- uint16_t last_pkts_n;
union {
struct vring_used_elem *descs_split;
struct vring_used_elem_packed *buffers_packed;
@@ -1619,7 +1619,11 @@ virtio_dev_rx_async_submit_split(struct virtio_net *dev,
vq->shadow_used_idx);
async->desc_idx_split += vq->shadow_used_idx;
+
async->pkts_idx += pkt_idx;
+ if (async->pkts_idx >= vq->size)
+ async->pkts_idx -= vq->size;
+
async->pkts_inflight_n += pkt_idx;
vq->shadow_used_idx = 0;
}
@@ -1921,68 +1925,44 @@ static __rte_always_inline uint16_t
vhost_poll_enqueue_completed(struct virtio_net *dev, uint16_t queue_id,
struct rte_mbuf **pkts, uint16_t count)
{
- struct vhost_virtqueue *vq;
- struct vhost_async *async;
- struct async_inflight_info *pkts_info;
+ struct vhost_virtqueue *vq = dev->virtqueue[queue_id];
+ struct vhost_async *async = vq->async;
+ struct async_inflight_info *pkts_info = async->pkts_info;
int32_t n_cpl;
- uint16_t n_pkts_cpl = 0, n_pkts_put = 0, n_descs = 0, n_buffers = 0;
- uint16_t start_idx, pkts_idx, vq_size;
- uint16_t from, i;
+ uint16_t n_descs = 0, n_buffers = 0;
+ uint16_t start_idx, from, i;
- vq = dev->virtqueue[queue_id];
- async = vq->async;
- pkts_idx = async->pkts_idx % vq->size;
- pkts_info = async->pkts_info;
- vq_size = vq->size;
- start_idx = virtio_dev_rx_async_get_info_idx(pkts_idx,
- vq_size, async->pkts_inflight_n);
-
- if (count > async->last_pkts_n) {
- n_cpl = async->ops.check_completed_copies(dev->vid,
- queue_id, 0, count - async->last_pkts_n);
- if (likely(n_cpl >= 0)) {
- n_pkts_cpl = n_cpl;
- } else {
- VHOST_LOG_DATA(ERR,
- "(%d) %s: failed to check completed copies for queue id %d.\n",
+ start_idx = virtio_dev_rx_async_get_info_idx(async->pkts_idx,
+ vq->size, async->pkts_inflight_n);
+
+ n_cpl = async->ops.check_completed_copies(dev->vid, queue_id, 0, count);
+ if (unlikely(n_cpl < 0)) {
+ VHOST_LOG_DATA(ERR, "(%d) %s: failed to check completed copies for queue id %d.\n",
dev->vid, __func__, queue_id);
- n_pkts_cpl = 0;
- }
+ return 0;
}
- n_pkts_cpl += async->last_pkts_n;
- n_pkts_put = RTE_MIN(n_pkts_cpl, count);
- if (unlikely(n_pkts_put == 0)) {
- async->last_pkts_n = n_pkts_cpl;
+ if (n_cpl == 0)
return 0;
- }
- if (vq_is_packed(dev)) {
- for (i = 0; i < n_pkts_put; i++) {
- from = (start_idx + i) % vq_size;
- n_buffers += pkts_info[from].nr_buffers;
- pkts[i] = pkts_info[from].mbuf;
- }
- } else {
- for (i = 0; i < n_pkts_put; i++) {
- from = (start_idx + i) & (vq_size - 1);
- n_descs += pkts_info[from].descs;
- pkts[i] = pkts_info[from].mbuf;
- }
+ for (i = 0; i < n_cpl; i++) {
+ from = (start_idx + i) % vq->size;
+ /* Only used with packed ring */
+ n_buffers += pkts_info[from].nr_buffers;
+ /* Only used with split ring */
+ n_descs += pkts_info[from].descs;
+ pkts[i] = pkts_info[from].mbuf;
}
- async->last_pkts_n = n_pkts_cpl - n_pkts_put;
- async->pkts_inflight_n -= n_pkts_put;
+
+ async->pkts_inflight_n -= n_cpl;
if (likely(vq->enabled && vq->access_ok)) {
if (vq_is_packed(dev)) {
write_back_completed_descs_packed(vq, n_buffers);
-
vhost_vring_call_packed(dev, vq);
} else {
write_back_completed_descs_split(vq, n_descs);
-
- __atomic_add_fetch(&vq->used->idx, n_descs,
- __ATOMIC_RELEASE);
+ __atomic_add_fetch(&vq->used->idx, n_descs, __ATOMIC_RELEASE);
vhost_vring_call_split(dev, vq);
}
} else {
@@ -1995,7 +1975,7 @@ vhost_poll_enqueue_completed(struct virtio_net *dev, uint16_t queue_id,
}
}
- return n_pkts_put;
+ return n_cpl;
}
uint16_t