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vhost: add packed ring support to vring base requests

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For packed ring layout, we need save avail index and its wrap
counter value. At restore time, the used index and its wrap counter
are set to available's ones, as the ring procressing is stopped
at vring base get time.

Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Reviewed-by: Jens Freimann <jfreimann@redhat.com>
Reviewed-by: Tiwei Bie <tiwei.bie@intel.com>
This commit is contained in:
Maxime Coquelin 2018-10-31 11:26:39 +01:00 committed by Ferruh Yigit
parent 2a821d81f3
commit 2ce8b8973d
1 changed files with 34 additions and 6 deletions
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40
lib/librte_vhost/vhost_user.c
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@ -696,10 +696,27 @@ vhost_user_set_vring_base(struct virtio_net **pdev,
int main_fd __rte_unused)
{
struct virtio_net *dev = *pdev;
dev->virtqueue[msg->payload.state.index]->last_used_idx =
msg->payload.state.num;
dev->virtqueue[msg->payload.state.index]->last_avail_idx =
msg->payload.state.num;
struct vhost_virtqueue *vq = dev->virtqueue[msg->payload.state.index];
uint64_t val = msg->payload.state.num;
if (vq_is_packed(dev)) {
/*
* Bit[0:14]: avail index
* Bit[15]: avail wrap counter
*/
vq->last_avail_idx = val & 0x7fff;
vq->avail_wrap_counter = !!(val & (0x1 << 15));
/*
* Set used index to same value as available one, as
* their values should be the same since ring processing
* was stopped at get time.
*/
vq->last_used_idx = vq->last_avail_idx;
vq->used_wrap_counter = vq->avail_wrap_counter;
} else {
vq->last_used_idx = msg->payload.state.num;
vq->last_avail_idx = msg->payload.state.num;
}
return VH_RESULT_OK;
}
@ -1208,6 +1225,7 @@ vhost_user_get_vring_base(struct virtio_net **pdev,
{
struct virtio_net *dev = *pdev;
struct vhost_virtqueue *vq = dev->virtqueue[msg->payload.state.index];
uint64_t val;
/* We have to stop the queue (virtio) if it is running. */
vhost_destroy_device_notify(dev);
@ -1215,8 +1233,18 @@ vhost_user_get_vring_base(struct virtio_net **pdev,
dev->flags &= ~VIRTIO_DEV_READY;
dev->flags &= ~VIRTIO_DEV_VDPA_CONFIGURED;
/* Here we are safe to get the last avail index */
msg->payload.state.num = vq->last_avail_idx;
/* Here we are safe to get the indexes */
if (vq_is_packed(dev)) {
/*
* Bit[0:14]: avail index
* Bit[15]: avail wrap counter
*/
val = vq->last_avail_idx & 0x7fff;
val |= vq->avail_wrap_counter << 15;
msg->payload.state.num = val;
} else {
msg->payload.state.num = vq->last_avail_idx;
}
RTE_LOG(INFO, VHOST_CONFIG,
"vring base idx:%d file:%d\n", msg->payload.state.index,