[dpdk-dev] [PATCH v4 1/2] net/virtio: add vhost-user protocol features support

Xia, Chenbo chenbo.xia at intel.com
Sun Jul 5 15:52:50 CEST 2020
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> -----Original Message-----
> From: Adrian Moreno <amorenoz at redhat.com>
> Sent: Friday, July 3, 2020 11:57 PM
> To: dev at dpdk.org
> Cc: Xia, Chenbo <chenbo.xia at intel.com>; Wang, Zhihong
> <zhihong.wang at intel.com>; Wang, Xiao W <xiao.w.wang at intel.com>; Yigit,
> Ferruh <ferruh.yigit at intel.com>; maxime.coquelin at redhat.com
> Subject: [PATCH v4 1/2] net/virtio: add vhost-user protocol features support
> 
> From: Maxime Coquelin <maxime.coquelin at redhat.com>
> 
> This patch adds support for Vhost-user protocol features.
> It is required to support protocol features that were not in initial Vhost-user
> specification, such as reply-ack, MTU...
> 
> Also, this patch prevents Virtio multiqueue feature negotiation if the slave does
> not support MQ protocol feature as stated in Vhost-user specification:
> "The multiple queues feature is supported only when the protocol feature
> ``VHOST_USER_PROTOCOL_F_MQ`` (bit 0) is set."
> 
> Signed-off-by: Maxime Coquelin <maxime.coquelin at redhat.com>
> ---
>  drivers/net/virtio/virtio_user/vhost.h        |  9 +++++
>  drivers/net/virtio/virtio_user/vhost_user.c   |  5 +++
>  .../net/virtio/virtio_user/virtio_user_dev.c  | 40 ++++++++++++++++++-
>   .../net/virtio/virtio_user/virtio_user_dev.h  |  3 ++
>  drivers/net/virtio/virtio_user_ethdev.c       | 20 ++++++++++
>  5 files changed, 75 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/virtio/virtio_user/vhost.h
> b/drivers/net/virtio/virtio_user/vhost.h
> index 1e784e58e..9ace1a90c 100644
> --- a/drivers/net/virtio/virtio_user/vhost.h
> +++ b/drivers/net/virtio/virtio_user/vhost.h
> @@ -44,6 +44,15 @@ struct vhost_vring_addr {
>  	uint64_t log_guest_addr;
>  };
> 
> +#ifndef VHOST_USER_F_PROTOCOL_FEATURES
> +#define VHOST_USER_F_PROTOCOL_FEATURES 30 #endif
> +
> +/** Protocol features. */
> +#ifndef VHOST_USER_PROTOCOL_F_MQ
> +#define VHOST_USER_PROTOCOL_F_MQ	0
> +#endif
> +
>  enum vhost_user_request {
>  	VHOST_USER_NONE = 0,
>  	VHOST_USER_GET_FEATURES = 1,
> diff --git a/drivers/net/virtio/virtio_user/vhost_user.c
> b/drivers/net/virtio/virtio_user/vhost_user.c
> index 74b82e56e..e33067561 100644
> --- a/drivers/net/virtio/virtio_user/vhost_user.c
> +++ b/drivers/net/virtio/virtio_user/vhost_user.c
> @@ -241,6 +241,8 @@ const char * const vhost_msg_strings[] = {
>  	[VHOST_USER_SET_VRING_KICK] = "VHOST_SET_VRING_KICK",
>  	[VHOST_USER_SET_MEM_TABLE] = "VHOST_SET_MEM_TABLE",
>  	[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",
>  };
> 
>  static int
> @@ -269,10 +271,12 @@ vhost_user_sock(struct virtio_user_dev *dev,
> 
>  	switch (req) {
>  	case VHOST_USER_GET_FEATURES:
> +	case VHOST_USER_GET_PROTOCOL_FEATURES:
>  		need_reply = 1;
>  		break;
> 
>  	case VHOST_USER_SET_FEATURES:
> +	case VHOST_USER_SET_PROTOCOL_FEATURES:
>  	case VHOST_USER_SET_LOG_BASE:
>  		msg.payload.u64 = *((__u64 *)arg);
>  		msg.size = sizeof(m.payload.u64);
> @@ -351,6 +355,7 @@ vhost_user_sock(struct virtio_user_dev *dev,
> 
>  		switch (req) {
>  		case VHOST_USER_GET_FEATURES:
> +		case VHOST_USER_GET_PROTOCOL_FEATURES:
>  			if (msg.size != sizeof(m.payload.u64)) {
>  				PMD_DRV_LOG(ERR, "Received bad msg size");
>  				return -1;
> diff --git a/drivers/net/virtio/virtio_user/virtio_user_dev.c
> b/drivers/net/virtio/virtio_user/virtio_user_dev.c
> index 7fb135f49..105536d35 100644
> --- a/drivers/net/virtio/virtio_user/virtio_user_dev.c
> +++ b/drivers/net/virtio/virtio_user/virtio_user_dev.c
> @@ -151,8 +151,10 @@ virtio_user_start_device(struct virtio_user_dev *dev)
>  	if (virtio_user_queue_setup(dev, virtio_user_create_queue) < 0)
>  		goto error;
> 
> -	/* Step 1: set features */
> +	/* Step 1: negotiate protocol features & set features */
>  	features = dev->features;
> +
> +
>  	/* Strip VIRTIO_NET_F_MAC, as MAC address is handled in vdev init */
>  	features &= ~(1ull << VIRTIO_NET_F_MAC);
>  	/* Strip VIRTIO_NET_F_CTRL_VQ, as devices do not really need to know
> */ @@ -417,13 +419,19 @@ virtio_user_dev_setup(struct virtio_user_dev *dev)
>  	 1ULL << VIRTIO_NET_F_GUEST_TSO6	|	\
>  	 1ULL << VIRTIO_F_IN_ORDER		|	\
>  	 1ULL << VIRTIO_F_VERSION_1		|	\
> -	 1ULL << VIRTIO_F_RING_PACKED)
> +	 1ULL << VIRTIO_F_RING_PACKED		|	\
> +	 1ULL << VHOST_USER_F_PROTOCOL_FEATURES)
> +
> +#define VIRTIO_USER_SUPPORTED_PROTOCOL_FEATURES		\
> +	(1ULL << VHOST_USER_PROTOCOL_F_MQ)
> 
>  int
>  virtio_user_dev_init(struct virtio_user_dev *dev, char *path, int queues,
>  		     int cq, int queue_size, const char *mac, char **ifname,
>  		     int server, int mrg_rxbuf, int in_order, int packed_vq)  {
> +	uint64_t protocol_features = 0;
> +
>  	pthread_mutex_init(&dev->mutex, NULL);
>  	strlcpy(dev->path, path, PATH_MAX);
>  	dev->started = 0;
> @@ -434,6 +442,7 @@ virtio_user_dev_init(struct virtio_user_dev *dev, char
> *path, int queues,
>  	dev->mac_specified = 0;
>  	dev->frontend_features = 0;
>  	dev->unsupported_features = ~VIRTIO_USER_SUPPORTED_FEATURES;
> +	dev->protocol_features =
> VIRTIO_USER_SUPPORTED_PROTOCOL_FEATURES;
>  	parse_mac(dev, mac);
> 
>  	if (*ifname) {
> @@ -446,6 +455,10 @@ virtio_user_dev_init(struct virtio_user_dev *dev, char
> *path, int queues,
>  		return -1;
>  	}
> 
> +	if (!is_vhost_user_by_type(dev->path))
> +		dev->unsupported_features |=
> +			(1ULL << VHOST_USER_F_PROTOCOL_FEATURES);
> +
>  	if (!dev->is_server) {
>  		if (dev->ops->send_request(dev, VHOST_USER_SET_OWNER,
>  					   NULL) < 0) {
> @@ -460,6 +473,27 @@ virtio_user_dev_init(struct virtio_user_dev *dev, char
> *path, int queues,
>  				     strerror(errno));
>  			return -1;
>  		}
> +
> +
> +		if (dev->device_features &
> +				(1ULL <<
> VHOST_USER_F_PROTOCOL_FEATURES)) {
> +			if (dev->ops->send_request(dev,
> +
> 	VHOST_USER_GET_PROTOCOL_FEATURES,
> +					&protocol_features))
> +				return -1;
> +
> +			dev->protocol_features &= protocol_features;
> +
> +			if (dev->ops->send_request(dev,
> +
> 	VHOST_USER_SET_PROTOCOL_FEATURES,
> +					&dev->protocol_features))
> +				return -1;
> +
> +			if (!(dev->protocol_features &
> +					(1ULL <<
> VHOST_USER_PROTOCOL_F_MQ)))
> +				dev->unsupported_features |=
> +					(1ull << VIRTIO_NET_F_MQ);
> +		}
>  	} else {
>  		/* We just pretend vhost-user can support all these features.
>  		 * Note that this could be problematic that if some feature is
> @@ -469,6 +503,8 @@ virtio_user_dev_init(struct virtio_user_dev *dev, char
> *path, int queues,
>  		dev->device_features = VIRTIO_USER_SUPPORTED_FEATURES;
>  	}
> 
> +
> +
>  	if (!mrg_rxbuf)
>  		dev->unsupported_features |= (1ull <<
> VIRTIO_NET_F_MRG_RXBUF);
> 
> diff --git a/drivers/net/virtio/virtio_user/virtio_user_dev.h
> b/drivers/net/virtio/virtio_user/virtio_user_dev.h
> index 3b6b6065a..56e638f8a 100644
> --- a/drivers/net/virtio/virtio_user/virtio_user_dev.h
> +++ b/drivers/net/virtio/virtio_user/virtio_user_dev.h
> @@ -40,6 +40,9 @@ struct virtio_user_dev {
>  	uint64_t	device_features; /* supported features by device */
>  	uint64_t	frontend_features; /* enabled frontend features */
>  	uint64_t	unsupported_features; /* unsupported features mask
> */
> +	uint64_t	protocol_features; /* negotiated protocol features
> +					    * (Vhost-user only)
> +					    */
>  	uint8_t		status;
>  	uint16_t	port_id;
>  	uint8_t		mac_addr[RTE_ETHER_ADDR_LEN];
> diff --git a/drivers/net/virtio/virtio_user_ethdev.c
> b/drivers/net/virtio/virtio_user_ethdev.c
> index 798f191c3..e51425c4f 100644
> --- a/drivers/net/virtio/virtio_user_ethdev.c
> +++ b/drivers/net/virtio/virtio_user_ethdev.c
> @@ -68,6 +68,7 @@ virtio_user_server_reconnect(struct virtio_user_dev *dev)
>  	int connectfd;
>  	struct rte_eth_dev *eth_dev = &rte_eth_devices[dev->port_id];
>  	struct virtio_hw *hw = eth_dev->data->dev_private;
> +	uint64_t protocol_features;
> 
>  	connectfd = accept(dev->listenfd, NULL, NULL);
>  	if (connectfd < 0)
> @@ -81,6 +82,25 @@ virtio_user_server_reconnect(struct virtio_user_dev *dev)
>  		return -1;
>  	}
> 
> +	if (dev->device_features &
> +			(1ULL << VHOST_USER_F_PROTOCOL_FEATURES)) {
> +		if (dev->ops->send_request(dev,
> +
> 	VHOST_USER_GET_PROTOCOL_FEATURES,
> +					&protocol_features))
> +			return -1;
> +
> +		dev->protocol_features &= protocol_features;
> +
> +		if (dev->ops->send_request(dev,
> +
> 	VHOST_USER_SET_PROTOCOL_FEATURES,
> +					&dev->protocol_features))
> +			return -1;
> +
> +		if (!(dev->protocol_features &
> +				(1ULL << VHOST_USER_PROTOCOL_F_MQ)))
> +			dev->unsupported_features |= (1ull <<
> VIRTIO_NET_F_MQ);
> +	}
> +
>  	dev->device_features |= dev->frontend_features;
> 
>  	/* umask vhost-user unsupported features */
> --
> 2.26.2

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