[dpdk-dev] [PATCH v2 2/4] net/virtio: add VIRTIO_SET_STATUS support to Virtio-user

[Xia, Chenbo]

> -----Original Message-----
> From: Adrian Moreno <amorenoz at redhat.com>
> Sent: Tuesday, August 4, 2020 3:24 PM
> To: dev at dpdk.org
> Cc: Wang, Zhihong <zhihong.wang at intel.com>; Xia, Chenbo
> <chenbo.xia at intel.com>; maxime.coquelin at redhat.com; Adrian Moreno
> <amorenoz at redhat.com>
> Subject: [PATCH v2 2/4] net/virtio: add VIRTIO_SET_STATUS support to
> Virtio-user
> 
> From: Maxime Coquelin <maxime.coquelin at redhat.com>
> 
> This patch adds support for VHOST_USER_SET_STATUS
> request. It is used to make the backend aware of
> Virtio devices status update.
> 
> It is useful for the backend to know when the Virtio
> driver is done with the Virtio device configuration.
> 
> Signed-off-by: Maxime Coquelin <maxime.coquelin at redhat.com>
> Signed-off-by: Adrian Moreno <amorenoz at redhat.com>
> ---
>  drivers/net/virtio/virtio_user/vhost.h        |  6 +++++
>  drivers/net/virtio/virtio_user/vhost_user.c   | 10 +++++++
>  .../net/virtio/virtio_user/virtio_user_dev.c  | 26 ++++++++++++++++++-
>  .../net/virtio/virtio_user/virtio_user_dev.h  |  1 +
>  drivers/net/virtio/virtio_user_ethdev.c       |  1 +
>  5 files changed, 43 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/virtio/virtio_user/vhost.h
> b/drivers/net/virtio/virtio_user/vhost.h
> index 260e1c308..8f49ef457 100644
> --- a/drivers/net/virtio/virtio_user/vhost.h
> +++ b/drivers/net/virtio/virtio_user/vhost.h
> @@ -57,6 +57,10 @@ struct vhost_vring_addr {
>  #define VHOST_USER_PROTOCOL_F_REPLY_ACK 3
>  #endif
> 
> +#ifndef VHOST_USER_PROTOCOL_F_STATUS
> +#define VHOST_USER_PROTOCOL_F_STATUS 16
> +#endif
> +
>  enum vhost_user_request {
>  	VHOST_USER_NONE = 0,
>  	VHOST_USER_GET_FEATURES = 1,
> @@ -77,6 +81,8 @@ enum vhost_user_request {
>  	VHOST_USER_SET_PROTOCOL_FEATURES = 16,
>  	VHOST_USER_GET_QUEUE_NUM = 17,
>  	VHOST_USER_SET_VRING_ENABLE = 18,
> +	VHOST_USER_SET_STATUS = 39,
> +	VHOST_USER_GET_STATUS = 40,
>  	VHOST_USER_MAX
>  };
> 
> diff --git a/drivers/net/virtio/virtio_user/vhost_user.c
> b/drivers/net/virtio/virtio_user/vhost_user.c
> index ad48bafd4..337e51199 100644
> --- a/drivers/net/virtio/virtio_user/vhost_user.c
> +++ b/drivers/net/virtio/virtio_user/vhost_user.c
> @@ -244,6 +244,8 @@ const char * const vhost_msg_strings[] = {
>  	[VHOST_USER_SET_VRING_ENABLE] = "VHOST_SET_VRING_ENABLE",
>  	[VHOST_USER_GET_PROTOCOL_FEATURES] =
> "VHOST_USER_GET_PROTOCOL_FEATURES",
>  	[VHOST_USER_SET_PROTOCOL_FEATURES] =
> "VHOST_USER_SET_PROTOCOL_FEATURES",
> +	[VHOST_USER_SET_STATUS] = "VHOST_SET_STATUS",
> +	[VHOST_USER_GET_STATUS] = "VHOST_GET_STATUS",
>  };
> 
>  static int
> @@ -280,6 +282,14 @@ vhost_user_sock(struct virtio_user_dev *dev,
>  		need_reply = 1;
>  		break;
> 
> +	case VHOST_USER_SET_STATUS:
> +		if (!(dev->protocol_features &
> +				(1ULL << VHOST_USER_PROTOCOL_F_STATUS)))
> +			return 0;
> +
> +		if (has_reply_ack)
> +			msg.flags |= VHOST_USER_NEED_REPLY_MASK;
> +		/* Fallthrough */
>  	case VHOST_USER_SET_FEATURES:
>  	case VHOST_USER_SET_PROTOCOL_FEATURES:
>  	case VHOST_USER_SET_LOG_BASE:
> diff --git a/drivers/net/virtio/virtio_user/virtio_user_dev.c
> b/drivers/net/virtio/virtio_user/virtio_user_dev.c
> index 0a6991bcc..670fc9d40 100644
> --- a/drivers/net/virtio/virtio_user/virtio_user_dev.c
> +++ b/drivers/net/virtio/virtio_user/virtio_user_dev.c
> @@ -424,7 +424,8 @@ virtio_user_dev_setup(struct virtio_user_dev *dev)
> 
>  #define VIRTIO_USER_SUPPORTED_PROTOCOL_FEATURES		\
>  	(1ULL << VHOST_USER_PROTOCOL_F_MQ |		\
> -	 1ULL << VHOST_USER_PROTOCOL_F_REPLY_ACK)
> +	 1ULL << VHOST_USER_PROTOCOL_F_REPLY_ACK |	\
> +	 1ULL << VHOST_USER_PROTOCOL_F_STATUS)
> 
>  int
>  virtio_user_dev_init(struct virtio_user_dev *dev, char *path, int queues,
> @@ -783,3 +784,26 @@ virtio_user_handle_cq(struct virtio_user_dev *dev,
> uint16_t queue_idx)
>  		__atomic_add_fetch(&vring->used->idx, 1, __ATOMIC_RELAXED);
>  	}
>  }
> +
> +int
> +virtio_user_send_status_update(struct virtio_user_dev *dev, uint8_t
> status)
> +{
> +	int ret;
> +	uint64_t arg = status;
> +
> +	/* Vhost-user only for now */
> +	if (!is_vhost_user_by_type(dev->path))
> +		return 0;
> +
> +	if (!(dev->protocol_features & (1ULL <<
> VHOST_USER_PROTOCOL_F_STATUS)))
> +		return 0;
> +
> +	ret = dev->ops->send_request(dev, VHOST_USER_SET_STATUS, &arg);
> +	if (ret) {
> +		PMD_INIT_LOG(ERR, "VHOST_USER_SET_STATUS failed (%d): %s", ret,
> +			     strerror(errno));
> +		return -1;
> +	}
> +
> +	return 0;
> +}
> diff --git a/drivers/net/virtio/virtio_user/virtio_user_dev.h
> b/drivers/net/virtio/virtio_user/virtio_user_dev.h
> index 554174e81..835ab64ae 100644
> --- a/drivers/net/virtio/virtio_user/virtio_user_dev.h
> +++ b/drivers/net/virtio/virtio_user/virtio_user_dev.h
> @@ -72,4 +72,5 @@ void virtio_user_handle_cq(struct virtio_user_dev *dev,
> uint16_t queue_idx);
>  void virtio_user_handle_cq_packed(struct virtio_user_dev *dev,
>  				  uint16_t queue_idx);
>  uint8_t virtio_user_handle_mq(struct virtio_user_dev *dev, uint16_t
> q_pairs);
> +int virtio_user_send_status_update(struct virtio_user_dev *dev, uint8_t
> status);
>  #endif
> diff --git a/drivers/net/virtio/virtio_user_ethdev.c
> b/drivers/net/virtio/virtio_user_ethdev.c
> index 6003f6d50..785882e06 100644
> --- a/drivers/net/virtio/virtio_user_ethdev.c
> +++ b/drivers/net/virtio/virtio_user_ethdev.c
> @@ -272,6 +272,7 @@ virtio_user_set_status(struct virtio_hw *hw, uint8_t
> status)
>  	else if (status == VIRTIO_CONFIG_STATUS_RESET)
>  		virtio_user_reset(hw);
>  	dev->status = status;
> +	virtio_user_send_status_update(dev, status);
>  }
> 
>  static uint8_t
> --
> 2.26.2

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