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vhost: add features changed callback

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Features could be changed after the feature negotiation. For example,
VHOST_F_LOG_ALL will be set/cleared at the start/end of live migration,
respecitively. Thus, we need a new callback to inform the application
on such change.

Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
This commit is contained in:
Yuanhan Liu 2017-04-01 15:22:54 +08:00
parent cb04355743
commit abd53c16b6
3 changed files with 20 additions and 1 deletions
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6
doc/guides/prog_guide/vhost_lib.rst
View File

@ -143,6 +143,12 @@ The following is an overview of some key Vhost API functions:
This callback is invoked when a specific queue's state is changed, for
example to enabled or disabled.
* ``features_changed(int vid, uint64_t features)``
This callback is invoked when the features is changed. For example,
``VHOST_F_LOG_ALL`` will be set/cleared at the start/end of live
migration, respectively.
* ``rte_vhost_enqueue_burst(vid, queue_id, pkts, count)``
Transmits (enqueues) ``count`` packets from host to guest.

10
lib/librte_vhost/rte_virtio_net.h
View File

@ -93,7 +93,15 @@ struct vhost_device_ops {
int (*vring_state_changed)(int vid, uint16_t queue_id, int enable); /**< triggered when a vring is enabled or disabled */
void *reserved[5]; /**< Reserved for future extension */
/**
* Features could be changed after the feature negotiation.
* For example, VHOST_F_LOG_ALL will be set/cleared at the
* start/end of live migration, respectively. This callback
* is used to inform the application on such change.
*/
int (*features_changed)(int vid, uint64_t features);
void *reserved[4]; /**< Reserved for future extension */
};
/**

5
lib/librte_vhost/vhost_user.c
View File

@ -167,6 +167,11 @@ vhost_user_set_features(struct virtio_net *dev, uint64_t features)
if (features & ~vhost_features)
return -1;
if ((dev->flags & VIRTIO_DEV_RUNNING) && dev->features != features) {
if (dev->notify_ops->features_changed)
dev->notify_ops->features_changed(dev->vid, features);
}
dev->features = features;
if (dev->features &
((1 << VIRTIO_NET_F_MRG_RXBUF) | (1ULL << VIRTIO_F_VERSION_1))) {