DPDK patches and discussions
 help / color / mirror / Atom feed
From: Maxime Coquelin <maxime.coquelin@redhat.com>
To: Matan Azrad <matan@mellanox.com>
Cc: dev@dpdk.org, Xiao Wang <xiao.w.wang@intel.com>
Subject: Re: [dpdk-dev] [PATCH v2 2/5] vhost: improve device readiness notifications
Date: Fri, 26 Jun 2020 14:10:25 +0200
Message-ID: <7c755874-b800-e949-79ea-a90071613690@redhat.com> (raw)
In-Reply-To: <1593092298-52257-3-git-send-email-matan@mellanox.com>



On 6/25/20 3:38 PM, Matan Azrad wrote:
> Some guest drivers may not configure disabled virtio queues.
> 
> In this case, the vhost management never notifies the application and
> the vDPA device readiness because it waits to the device to be ready.
> 
> The current ready state means that all the virtio queues should be
> configured regardless the enablement status.
> 
> In order to support this case, this patch changes the ready state:
> The device is ready when at least 1 queue pair is configured and
> enabled.
> 
> So, now, the application and vDPA driver are notifies when the first
> queue pair is configured and enabled.
> 
> Also the queue notifications will be triggered according to the new
> ready definition.
> 
> Signed-off-by: Matan Azrad <matan@mellanox.com>
> ---
>  lib/librte_vhost/vhost.h      |  1 +
>  lib/librte_vhost/vhost_user.c | 55 +++++++++++++++++++++++++++++--------------
>  2 files changed, 38 insertions(+), 18 deletions(-)
> 
> diff --git a/lib/librte_vhost/vhost.h b/lib/librte_vhost/vhost.h
> index 17f1e9a..8a74f33 100644
> --- a/lib/librte_vhost/vhost.h
> +++ b/lib/librte_vhost/vhost.h
> @@ -151,6 +151,7 @@ struct vhost_virtqueue {
>  	int			backend;
>  	int			enabled;
>  	int			access_ok;
> +	int			ready;
>  	rte_spinlock_t		access_lock;
>  
>  	/* Used to notify the guest (trigger interrupt) */
> diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
> index 8d8050b..b90fc78 100644
> --- a/lib/librte_vhost/vhost_user.c
> +++ b/lib/librte_vhost/vhost_user.c
> @@ -228,6 +228,21 @@
>  	dev->postcopy_listening = 0;
>  }
>  
> +static void
> +vhost_user_notify_queue_state(struct virtio_net *dev, uint16_t index,
> +			      int enable)
> +{
> +	int did = dev->vdpa_dev_id;
> +	struct rte_vdpa_device *vdpa_dev = rte_vdpa_get_device(did);
> +
> +	if (vdpa_dev && vdpa_dev->ops->set_vring_state)
> +		vdpa_dev->ops->set_vring_state(dev->vid, index, enable);
> +
> +	if (dev->notify_ops->vring_state_changed)
> +		dev->notify_ops->vring_state_changed(dev->vid,
> +				index, enable);
> +}
> +
>  /*
>   * This function just returns success at the moment unless
>   * the device hasn't been initialised.
> @@ -1306,27 +1321,31 @@
>  
>  	return rings_ok &&
>  	       vq->kickfd != VIRTIO_UNINITIALIZED_EVENTFD &&
> -	       vq->callfd != VIRTIO_UNINITIALIZED_EVENTFD;
> +	       vq->callfd != VIRTIO_UNINITIALIZED_EVENTFD &&
> +	       vq->enabled;
>  }
>  
> +#define VIRTIO_DEV_NUM_VQS_TO_BE_READY 2u

(Thinking out loud) If for some reason it would cause issue with OVS-
DPDK or other application, it should be easy to only apply this new way
of initializing the device based on whether vdpa device is attached or
not.

>  static int
>  virtio_is_ready(struct virtio_net *dev)
>  {
>  	struct vhost_virtqueue *vq;
>  	uint32_t i;
>  
> -	if (dev->nr_vring == 0)
> +	if (dev->nr_vring < VIRTIO_DEV_NUM_VQS_TO_BE_READY)
>  		return 0;
>  
> -	for (i = 0; i < dev->nr_vring; i++) {
> +	for (i = 0; i < VIRTIO_DEV_NUM_VQS_TO_BE_READY; i++) {
>  		vq = dev->virtqueue[i];
>  
>  		if (!vq_is_ready(dev, vq))
>  			return 0;
>  	}
>  
> -	VHOST_LOG_CONFIG(INFO,
> -		"virtio is now ready for processing.\n");
> +	if (!(dev->flags & VIRTIO_DEV_RUNNING))
> +		VHOST_LOG_CONFIG(INFO,
> +			"virtio is now ready for processing.\n");
>  	return 1;
>  }


Patch looks good to me, thanks for working on it.


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

Maxime


  reply	other threads:[~2020-06-26 12:10 UTC|newest]

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-18 16:28 [dpdk-dev] [PATCH v1 0/4] vhost: improve ready state Matan Azrad
2020-06-18 16:28 ` [dpdk-dev] [PATCH v1 1/4] vhost: support host notifier queue configuration Matan Azrad
2020-06-19  6:44   ` Maxime Coquelin
2020-06-19 13:28     ` Matan Azrad
2020-06-19 14:01       ` Maxime Coquelin
2020-06-21  6:26         ` Matan Azrad
2020-06-22  8:06           ` Maxime Coquelin
2020-06-18 16:28 ` [dpdk-dev] [PATCH v1 2/4] vhost: skip access lock when vDPA is configured Matan Azrad
2020-06-19  6:49   ` Maxime Coquelin
2020-06-18 16:28 ` [dpdk-dev] [PATCH v1 3/4] vhost: improve device ready definition Matan Azrad
2020-06-19  7:41   ` Maxime Coquelin
2020-06-19 12:04     ` Maxime Coquelin
2020-06-19 13:11     ` Matan Azrad
2020-06-19 13:54       ` Maxime Coquelin
2020-06-21  6:20         ` Matan Azrad
2020-06-22  8:04           ` Maxime Coquelin
2020-06-22  8:41             ` Matan Azrad
2020-06-22  8:56               ` Maxime Coquelin
2020-06-22 10:06                 ` Matan Azrad
2020-06-22 12:32                   ` Maxime Coquelin
2020-06-22 13:43                     ` Matan Azrad
2020-06-22 14:55                       ` Maxime Coquelin
2020-06-22 15:51                         ` Matan Azrad
2020-06-22 16:47                           ` Maxime Coquelin
2020-06-23  9:02                             ` Matan Azrad
2020-06-23  9:19                               ` Maxime Coquelin
2020-06-23 11:53                                 ` Matan Azrad
2020-06-23 13:55                                   ` Maxime Coquelin
2020-06-23 14:33                                     ` Maxime Coquelin
2020-06-23 14:52                                     ` Matan Azrad
2020-06-23 15:18                                       ` Maxime Coquelin
2020-06-24  5:54                                         ` Matan Azrad
2020-06-24  7:22                                           ` Maxime Coquelin
2020-06-24  8:38                                             ` Matan Azrad
2020-06-24  9:12                                               ` Maxime Coquelin
2020-06-18 16:28 ` [dpdk-dev] [PATCH v1 4/4] vdpa/mlx5: support queue update Matan Azrad
2020-06-25 13:38 ` [dpdk-dev] [PATCH v2 0/5] vhost: improve ready state Matan Azrad
2020-06-25 13:38   ` [dpdk-dev] [PATCH v2 1/5] vhost: skip access lock when vDPA is configured Matan Azrad
2020-06-28  3:06     ` Xia, Chenbo
2020-06-25 13:38   ` [dpdk-dev] [PATCH v2 2/5] vhost: improve device readiness notifications Matan Azrad
2020-06-26 12:10     ` Maxime Coquelin [this message]
2020-06-28  3:08     ` Xia, Chenbo
2020-06-25 13:38   ` [dpdk-dev] [PATCH v2 3/5] vhost: handle memory hotplug with vDPA devices Matan Azrad
2020-06-26 12:15     ` Maxime Coquelin
2020-06-28  3:18     ` Xia, Chenbo
2020-06-25 13:38   ` [dpdk-dev] [PATCH v2 4/5] vhost: notify virtq file descriptor update Matan Azrad
2020-06-26 12:19     ` Maxime Coquelin
2020-06-28  3:19     ` Xia, Chenbo
2020-06-25 13:38   ` [dpdk-dev] [PATCH v2 5/5] vdpa/mlx5: support queue update Matan Azrad
2020-06-26 12:29     ` Maxime Coquelin
2020-06-29 14:08   ` [dpdk-dev] [PATCH v3 0/6] vhost: improve ready state Matan Azrad
2020-06-29 14:08     ` [dpdk-dev] [PATCH v3 1/6] vhost: support host notifier queue configuration Matan Azrad
2020-06-29 14:08     ` [dpdk-dev] [PATCH v3 2/6] vhost: skip access lock when vDPA is configured Matan Azrad
2020-06-29 14:08     ` [dpdk-dev] [PATCH v3 3/6] vhost: improve device readiness notifications Matan Azrad
2020-06-29 14:08     ` [dpdk-dev] [PATCH v3 4/6] vhost: handle memory hotplug with vDPA devices Matan Azrad
2020-06-29 14:08     ` [dpdk-dev] [PATCH v3 5/6] vhost: notify virtq file descriptor update Matan Azrad
2020-06-29 14:08     ` [dpdk-dev] [PATCH v3 6/6] vdpa/mlx5: support queue update Matan Azrad
2020-06-29 17:24     ` [dpdk-dev] [PATCH v3 0/6] vhost: improve ready state Maxime Coquelin
2020-07-17  1:41       ` Wang, Yinan

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=7c755874-b800-e949-79ea-a90071613690@redhat.com \
    --to=maxime.coquelin@redhat.com \
    --cc=dev@dpdk.org \
    --cc=matan@mellanox.com \
    --cc=xiao.w.wang@intel.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

DPDK patches and discussions

This inbox may be cloned and mirrored by anyone:

	git clone --mirror https://inbox.dpdk.org/dev/0 dev/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 dev dev/ https://inbox.dpdk.org/dev \
		dev@dpdk.org
	public-inbox-index dev

Example config snippet for mirrors.
Newsgroup available over NNTP:
	nntp://inbox.dpdk.org/inbox.dpdk.dev


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git