diff mbox series

[v1,2/4] vhost: skip access lock when vDPA is configured

Message ID 1592497686-433697-3-git-send-email-matan@mellanox.com (mailing list archive)
State Superseded, archived
Delegated to: Maxime Coquelin
Headers
Series vhost: improve ready state |

Checks

Context Check Description
ci/checkpatch success coding style OK
ci/Intel-compilation fail apply issues

Commit Message

Matan Azrad June 18, 2020, 4:28 p.m. UTC 
  No need to take access lock in the vhost-user massage handler when
vDPA driver controls all the data-path of the vhost device.

It allows the vDPA set_vring_state operation callback to configure
guest notifications.

Signed-off-by: Matan Azrad <matan@mellanox.com>
---
 lib/librte_vhost/vhost_user.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

Comments

Maxime Coquelin June 19, 2020, 6:49 a.m. UTC | #1 
On 6/18/20 6:28 PM, Matan Azrad wrote:
> No need to take access lock in the vhost-user massage handler when

s/massage/message/

> vDPA driver controls all the data-path of the vhost device.
> 
> It allows the vDPA set_vring_state operation callback to configure
> guest notifications.
> 
> Signed-off-by: Matan Azrad <matan@mellanox.com>
> ---
>  lib/librte_vhost/vhost_user.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
> index cddfa4b..b0849b9 100644
> --- a/lib/librte_vhost/vhost_user.c
> +++ b/lib/librte_vhost/vhost_user.c
> @@ -2699,8 +2699,10 @@ typedef int (*vhost_message_handler_t)(struct virtio_net **pdev,
>  	case VHOST_USER_SEND_RARP:
>  	case VHOST_USER_NET_SET_MTU:
>  	case VHOST_USER_SET_SLAVE_REQ_FD:
> -		vhost_user_lock_all_queue_pairs(dev);
> -		unlock_required = 1;
> +		if (!(dev->flags & VIRTIO_DEV_VDPA_CONFIGURED)) {
> +			vhost_user_lock_all_queue_pairs(dev);
> +			unlock_required = 1;
> +		}
>  		break;
>  	default:
>  		break;
> 

Makes sense:

Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>

Thanks,
Maxime
diff mbox series

Patch

diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
index cddfa4b..b0849b9 100644
--- a/lib/librte_vhost/vhost_user.c
+++ b/lib/librte_vhost/vhost_user.c
@@ -2699,8 +2699,10 @@  typedef int (*vhost_message_handler_t)(struct virtio_net **pdev,
 	case VHOST_USER_SEND_RARP:
 	case VHOST_USER_NET_SET_MTU:
 	case VHOST_USER_SET_SLAVE_REQ_FD:
-		vhost_user_lock_all_queue_pairs(dev);
-		unlock_required = 1;
+		if (!(dev->flags & VIRTIO_DEV_VDPA_CONFIGURED)) {
+			vhost_user_lock_all_queue_pairs(dev);
+			unlock_required = 1;
+		}
 		break;
 	default:
 		break;