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vhost: add APIs to get inflight ring

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This patch introduces two APIs. one is for getting inflgiht
ring and the other is for getting base.

Signed-off-by: Lin Li <lilin24@baidu.com>
Signed-off-by: Xun Ni <nixun@baidu.com>
Signed-off-by: Yu Zhang <zhangyu31@baidu.com>
Signed-off-by: Jin Yu <jin.yu@intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
This commit is contained in:
Jin Yu 2019-10-10 04:48:35 +08:00 committed by Ferruh Yigit
parent bb0c2de960
commit 4d891f77dd
3 changed files with 103 additions and 0 deletions
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40
lib/librte_vhost/rte_vhost.h
View File

@ -709,6 +709,23 @@ int rte_vhost_get_mem_table(int vid, struct rte_vhost_memory **mem);
int rte_vhost_get_vhost_vring(int vid, uint16_t vring_idx,
struct rte_vhost_vring *vring);
/**
* Get guest inflight vring info, including inflight ring and resubmit list.
*
* @param vid
* vhost device ID
* @param vring_idx
* vring index
* @param vring
* the structure to hold the requested inflight vring info
* @return
* 0 on success, -1 on failure
*/
__rte_experimental
int
rte_vhost_get_vhost_ring_inflight(int vid, uint16_t vring_idx,
struct rte_vhost_ring_inflight *vring);
/**
* Set split inflight descriptor.
*
@ -885,6 +902,29 @@ int
rte_vhost_get_vring_base(int vid, uint16_t queue_id,
uint16_t *last_avail_idx, uint16_t *last_used_idx);
/**
* Get last_avail/last_used of the vhost virtqueue
*
* This function is designed for the reconnection and it's specific for
* the packed ring as we can get the two parameters from the inflight
* queueregion
*
* @param vid
* vhost device ID
* @param queue_id
* vhost queue index
* @param last_avail_idx
* vhost last_avail_idx to get
* @param last_used_idx
* vhost last_used_idx to get
* @return
* 0 on success, -1 on failure
*/
__rte_experimental
int
rte_vhost_get_vring_base_from_inflight(int vid,
uint16_t queue_id, uint16_t *last_avail_idx, uint16_t *last_used_idx);
/**
* Set last_avail/used_idx of the vhost virtqueue
*

2
lib/librte_vhost/rte_vhost_version.map
View File

@ -93,4 +93,6 @@ EXPERIMENTAL {
rte_vhost_set_last_inflight_io_packed;
rte_vhost_clr_inflight_desc_split;
rte_vhost_clr_inflight_desc_packed;
rte_vhost_get_vhost_ring_inflight;
rte_vhost_get_vring_base_from_inflight;
};

61
lib/librte_vhost/vhost.c
View File

@ -823,6 +823,41 @@ rte_vhost_get_vhost_vring(int vid, uint16_t vring_idx,
return 0;
}
int
rte_vhost_get_vhost_ring_inflight(int vid, uint16_t vring_idx,
struct rte_vhost_ring_inflight *vring)
{
struct virtio_net *dev;
struct vhost_virtqueue *vq;
dev = get_device(vid);
if (unlikely(!dev))
return -1;
if (vring_idx >= VHOST_MAX_VRING)
return -1;
vq = dev->virtqueue[vring_idx];
if (unlikely(!vq))
return -1;
if (vq_is_packed(dev)) {
if (unlikely(!vq->inflight_packed))
return -1;
vring->inflight_packed = vq->inflight_packed;
} else {
if (unlikely(!vq->inflight_split))
return -1;
vring->inflight_split = vq->inflight_split;
}
vring->resubmit_inflight = vq->resubmit_inflight;
return 0;
}
int
rte_vhost_set_inflight_desc_split(int vid, uint16_t vring_idx,
uint16_t idx)
@ -1318,6 +1353,32 @@ int rte_vhost_get_vring_base(int vid, uint16_t queue_id,
return 0;
}
int
rte_vhost_get_vring_base_from_inflight(int vid,
uint16_t queue_id,
uint16_t *last_avail_idx,
uint16_t *last_used_idx)
{
struct rte_vhost_inflight_info_packed *inflight_info;
struct virtio_net *dev = get_device(vid);
if (dev == NULL || last_avail_idx == NULL || last_used_idx == NULL)
return -1;
if (!vq_is_packed(dev))
return -1;
inflight_info = dev->virtqueue[queue_id]->inflight_packed;
if (!inflight_info)
return -1;
*last_avail_idx = (inflight_info->old_used_wrap_counter << 15) |
inflight_info->old_used_idx;
*last_used_idx = *last_avail_idx;
return 0;
}
int rte_vhost_set_vring_base(int vid, uint16_t queue_id,
uint16_t last_avail_idx, uint16_t last_used_idx)
{