[dpdk-dev] [PATCH v3 4/4] doc: update async vhost register/unregister
Jiayu Hu
jiayu.hu at intel.com
Tue Apr 20 10:57:46 CEST 2021
This patch is to update programmer guide for register/unregister
copy devices in vhost.
Signed-off-by: Jiayu Hu <jiayu.hu at intel.com>
---
doc/guides/prog_guide/vhost_lib.rst | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/doc/guides/prog_guide/vhost_lib.rst b/doc/guides/prog_guide/vhost_lib.rst
index dc29229..7afa351 100644
--- a/doc/guides/prog_guide/vhost_lib.rst
+++ b/doc/guides/prog_guide/vhost_lib.rst
@@ -208,9 +208,9 @@ The following is an overview of some key Vhost API functions:
* ``rte_vhost_async_channel_register(vid, queue_id, features, ops)``
- Register a vhost queue with async copy device channel.
- Following device ``features`` must be specified together with the
- registration:
+ Register a vhost queue with async copy device channel after vring
+ is enabled. Following device ``features`` must be specified together
+ with the registration:
* ``async_inorder``
@@ -244,6 +244,14 @@ The following is an overview of some key Vhost API functions:
* ``rte_vhost_async_channel_unregister(vid, queue_id)``
Unregister the async copy device channel from a vhost queue.
+ Unregistration will fail, if the vhost queue has in-flight
+ packets that are not completed.
+
+ Unregister async copy devices in vring_state_changed() may
+ fail, as this API tries to acquire the spinlock of vhost
+ queue. The recommended way is to unregister async copy
+ devices for all vhost queues in destroy_device(), when a
+ virtio device is paused or shut down.
* ``rte_vhost_submit_enqueue_burst(vid, queue_id, pkts, count, comp_pkts, comp_count)``
--
2.7.4
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