[v3,6/8] vhost: add support for virtio get status message

  This patch adds support to the new Virtio device get status
Vhost-user message.

The driver can send this new message to read the device status.

One of the uses of this message is to ensure the feature negotiation has
succeded.  According to the virtio spec, after completing the feature
negotiation, the driver sets the FEATURE_OK status bit and re-reads it
to ensure the device has accepted the features.

This patch also clears the FEATURE_OK status bit if the feature
negotiation has failed to let the driver know about his failure.

Signed-off-by: Adrian Moreno <amorenoz@redhat.com>
---
 lib/librte_vhost/vhost.h      |  2 ++
 lib/librte_vhost/vhost_user.c | 32 ++++++++++++++++++++++++++++++++
 lib/librte_vhost/vhost_user.h |  1 +
 3 files changed, 35 insertions(+)
  

> -----Original Message-----
> From: Adrian Moreno <amorenoz@redhat.com>
> Sent: Monday, July 6, 2020 7:25 PM
> To: dev@dpdk.org; Xia, Chenbo <chenbo.xia@intel.com>; Ye, Xiaolong
> <xiaolong.ye@intel.com>; shahafs@mellanox.com; matan@mellanox.com;
> maxime.coquelin@redhat.com; Wang, Xiao W <xiao.w.wang@intel.com>;
> viacheslavo@mellanox.com
> Cc: jasowang@redhat.com; lulu@redhat.com; Adrian Moreno
> <amorenoz@redhat.com>
> Subject: [PATCH v3 6/8] vhost: add support for virtio get status message
> 
> This patch adds support to the new Virtio device get status Vhost-user message.
> 
> The driver can send this new message to read the device status.
> 
> One of the uses of this message is to ensure the feature negotiation has
> succeded.  According to the virtio spec, after completing the feature negotiation,
> the driver sets the FEATURE_OK status bit and re-reads it to ensure the device
> has accepted the features.
> 
> This patch also clears the FEATURE_OK status bit if the feature negotiation has
> failed to let the driver know about his failure.
> 
> Signed-off-by: Adrian Moreno <amorenoz@redhat.com>
> ---
>  lib/librte_vhost/vhost.h      |  2 ++
>  lib/librte_vhost/vhost_user.c | 32 ++++++++++++++++++++++++++++++++
> lib/librte_vhost/vhost_user.h |  1 +
>  3 files changed, 35 insertions(+)
> 
> diff --git a/lib/librte_vhost/vhost.h b/lib/librte_vhost/vhost.h index
> 25d31c71b..e743821cc 100644
> --- a/lib/librte_vhost/vhost.h
> +++ b/lib/librte_vhost/vhost.h
> @@ -32,6 +32,8 @@
>  #define VIRTIO_DEV_BUILTIN_VIRTIO_NET 4
>  /* Used to indicate that the device has its own data path and configured */
> #define VIRTIO_DEV_VDPA_CONFIGURED 8
> +/* Used to indicate that the feature negotiation failed */ #define
> +VIRTIO_DEV_FEATURES_FAILED 16
> 
>  /* Backend value set by guest. */
>  #define VIRTIO_DEV_STOPPED -1
> diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c index
> 8d3d13913..5b6f4fb62 100644
> --- a/lib/librte_vhost/vhost_user.c
> +++ b/lib/librte_vhost/vhost_user.c
> @@ -88,6 +88,7 @@ static const char *vhost_message_str[VHOST_USER_MAX]
> = {
>  	[VHOST_USER_GET_INFLIGHT_FD] = "VHOST_USER_GET_INFLIGHT_FD",
>  	[VHOST_USER_SET_INFLIGHT_FD] = "VHOST_USER_SET_INFLIGHT_FD",
>  	[VHOST_USER_SET_STATUS] = "VHOST_USER_SET_STATUS",
> +	[VHOST_USER_GET_STATUS] = "VHOST_USER_GET_STATUS",
>  };
> 
>  static int send_vhost_reply(int sockfd, struct VhostUserMsg *msg); @@ -339,6
> +340,9 @@ vhost_user_set_features(struct virtio_net **pdev, struct
> VhostUserMsg *msg,
>  		VHOST_LOG_CONFIG(ERR,
>  			"(%d) received invalid negotiated features.\n",
>  			dev->vid);
> +		dev->flags |= VIRTIO_DEV_FEATURES_FAILED;
> +		dev->status &= ~VIRTIO_DEVICE_STATUS_FEATURES_OK;
> +
>  		return RTE_VHOST_MSG_RESULT_ERR;
>  	}
> 
> @@ -402,6 +406,7 @@ vhost_user_set_features(struct virtio_net **pdev, struct
> VhostUserMsg *msg,
>  	if (vdpa_dev)
>  		vdpa_dev->ops->set_features(dev->vid);
> 
> +	dev->flags &= ~VIRTIO_DEV_FEATURES_FAILED;
>  	return RTE_VHOST_MSG_RESULT_OK;
>  }
> 
> @@ -2458,6 +2463,22 @@ vhost_user_postcopy_end(struct virtio_net **pdev,
> struct VhostUserMsg *msg,
>  	return RTE_VHOST_MSG_RESULT_REPLY;
>  }
> 
> +static int
> +vhost_user_get_status(struct virtio_net **pdev, struct VhostUserMsg *msg,
> +		      int main_fd __rte_unused)
> +{
> +	struct virtio_net *dev = *pdev;
> +
> +	if (validate_msg_fds(msg, 0) != 0)
> +		return RTE_VHOST_MSG_RESULT_ERR;
> +
> +	msg->payload.u64 = dev->status;
> +	msg->size = sizeof(msg->payload.u64);
> +	msg->fd_num = 0;
> +
> +	return RTE_VHOST_MSG_RESULT_REPLY;
> +}
> +
>  static int
>  vhost_user_set_status(struct virtio_net **pdev, struct VhostUserMsg *msg,
>  			int main_fd __rte_unused)
> @@ -2476,6 +2497,16 @@ vhost_user_set_status(struct virtio_net **pdev,
> struct VhostUserMsg *msg,
> 
>  	dev->status = msg->payload.u64;
> 
> +	if ((dev->status & VIRTIO_DEVICE_STATUS_FEATURES_OK) &&
> +	    (dev->flags & VIRTIO_DEV_FEATURES_FAILED)) {
> +		VHOST_LOG_CONFIG(ERR, "FEATURES_OK bit is set but feature
> negotiation failed\n");
> +		/*
> +		 * Clear the bit to let the driver know about the feature
> +		 * negotiation failure
> +		 */
> +		dev->status &= ~VIRTIO_DEVICE_STATUS_FEATURES_OK;
> +	}
> +
>  	VHOST_LOG_CONFIG(INFO, "New device status(0x%08x):\n"
>  			"\t-ACKNOWLEDGE: %u\n"
>  			"\t-DRIVER: %u\n"
> @@ -2527,6 +2558,7 @@ static vhost_message_handler_t
> vhost_message_handlers[VHOST_USER_MAX] = {
>  	[VHOST_USER_GET_INFLIGHT_FD] = vhost_user_get_inflight_fd,
>  	[VHOST_USER_SET_INFLIGHT_FD] = vhost_user_set_inflight_fd,
>  	[VHOST_USER_SET_STATUS] = vhost_user_set_status,
> +	[VHOST_USER_GET_STATUS] = vhost_user_get_status,
>  };
> 
>  /* return bytes# of read on success or negative val on failure. */ diff --git
> a/lib/librte_vhost/vhost_user.h b/lib/librte_vhost/vhost_user.h index
> 82885ab5e..16fe03f88 100644
> --- a/lib/librte_vhost/vhost_user.h
> +++ b/lib/librte_vhost/vhost_user.h
> @@ -58,6 +58,7 @@ typedef enum VhostUserRequest {
>  	VHOST_USER_GET_INFLIGHT_FD = 31,
>  	VHOST_USER_SET_INFLIGHT_FD = 32,
>  	VHOST_USER_SET_STATUS = 39,
> +	VHOST_USER_GET_STATUS = 40,
>  	VHOST_USER_MAX = 41
>  } VhostUserRequest;
> 
> --
> 2.26.2

Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>