Re: [dpdk-dev] [PATCH 25/40] net/virtio: add Virtio-user features ops

[Adrian Moreno <amorenoz@redhat.com>]

On 12/20/20 10:13 PM, Maxime Coquelin wrote:
> This patch introduce new callbacks for getting
> and setting Virtio features, and implements them
> for the different backend types.
> 
> Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> ---
>  drivers/net/virtio/virtio_user/vhost.h        |   2 +
>  drivers/net/virtio/virtio_user/vhost_kernel.c | 150 +++++++++---------
>  .../net/virtio/virtio_user/vhost_kernel_tap.c |  23 +++
>  .../net/virtio/virtio_user/vhost_kernel_tap.h |   1 +
>  drivers/net/virtio/virtio_user/vhost_user.c   |  63 +++++++-
>  drivers/net/virtio/virtio_user/vhost_vdpa.c   |  38 +++--
>  .../net/virtio/virtio_user/virtio_user_dev.c  |   5 +-
>  drivers/net/virtio/virtio_user_ethdev.c       |   3 +-
>  8 files changed, 188 insertions(+), 97 deletions(-)
> 
> diff --git a/drivers/net/virtio/virtio_user/vhost.h b/drivers/net/virtio/virtio_user/vhost.h
> index 8e819ecfb8..16978e27ed 100644
> --- a/drivers/net/virtio/virtio_user/vhost.h
> +++ b/drivers/net/virtio/virtio_user/vhost.h
> @@ -102,6 +102,8 @@ struct virtio_user_dev;
>  struct virtio_user_backend_ops {
>  	int (*setup)(struct virtio_user_dev *dev);
>  	int (*set_owner)(struct virtio_user_dev *dev);
> +	int (*get_features)(struct virtio_user_dev *dev, uint64_t *features);
> +	int (*set_features)(struct virtio_user_dev *dev, uint64_t features);
>  	int (*send_request)(struct virtio_user_dev *dev,
>  			    enum vhost_user_request req,
>  			    void *arg);
> diff --git a/drivers/net/virtio/virtio_user/vhost_kernel.c b/drivers/net/virtio/virtio_user/vhost_kernel.c
> index b79dcad179..f44df8ef1f 100644
> --- a/drivers/net/virtio/virtio_user/vhost_kernel.c
> +++ b/drivers/net/virtio/virtio_user/vhost_kernel.c
> @@ -38,6 +38,28 @@ struct vhost_memory_kernel {
>  #define VHOST_SET_VRING_ERR _IOW(VHOST_VIRTIO, 0x22, struct vhost_vring_file)
>  #define VHOST_NET_SET_BACKEND _IOW(VHOST_VIRTIO, 0x30, struct vhost_vring_file)
>  
> +/* with below features, vhost kernel does not need to do the checksum and TSO,
> + * these info will be passed to virtio_user through virtio net header.
> + */
> +#define VHOST_KERNEL_GUEST_OFFLOADS_MASK	\
> +	((1ULL << VIRTIO_NET_F_GUEST_CSUM) |	\
> +	 (1ULL << VIRTIO_NET_F_GUEST_TSO4) |	\
> +	 (1ULL << VIRTIO_NET_F_GUEST_TSO6) |	\
> +	 (1ULL << VIRTIO_NET_F_GUEST_ECN)  |	\
> +	 (1ULL << VIRTIO_NET_F_GUEST_UFO))
> +
> +/* with below features, when flows from virtio_user to vhost kernel
> + * (1) if flows goes up through the kernel networking stack, it does not need
> + * to verify checksum, which can save CPU cycles;
> + * (2) if flows goes through a Linux bridge and outside from an interface
> + * (kernel driver), checksum and TSO will be done by GSO in kernel or even
> + * offloaded into real physical device.
> + */
> +#define VHOST_KERNEL_HOST_OFFLOADS_MASK		\

nit: backslash alignment

> +	((1ULL << VIRTIO_NET_F_HOST_TSO4) |	\
> +	 (1ULL << VIRTIO_NET_F_HOST_TSO6) |	\
> +	 (1ULL << VIRTIO_NET_F_CSUM))
> +
>  static uint64_t max_regions = 64;
>  
>  static void
> @@ -77,10 +99,57 @@ vhost_kernel_set_owner(struct virtio_user_dev *dev)
>  	return vhost_kernel_ioctl(dev->vhostfds[0], VHOST_SET_OWNER, NULL);
>  }
>  
> +static int
> +vhost_kernel_get_features(struct virtio_user_dev *dev, uint64_t *features)
> +{
> +	int ret;
> +	unsigned int tap_features;
> +
> +	ret = vhost_kernel_ioctl(dev->vhostfds[0], VHOST_GET_FEATURES, features);
> +	if (ret < 0) {
> +		PMD_DRV_LOG(ERR, "Failed to get features");
> +		return -1;
> +	}
> +
> +	ret = tap_support_features(&tap_features);
> +	if (ret < 0) {
> +		PMD_DRV_LOG(ERR, "Failed to get TAP features)");
> +		return -1;
> +	}
> +
> +	/* with tap as the backend, all these features are supported
> +	 * but not claimed by vhost-net, so we add them back when
> +	 * reporting to upper layer.
> +	 */
> +	if (tap_features & IFF_VNET_HDR) {
> +		*features |= VHOST_KERNEL_GUEST_OFFLOADS_MASK;
> +		*features |= VHOST_KERNEL_HOST_OFFLOADS_MASK;
> +	}
> +
> +	/* vhost_kernel will not declare this feature, but it does
> +	 * support multi-queue.
> +	 */
> +	if (tap_features & IFF_MULTI_QUEUE)
> +		*features |= (1ull << VIRTIO_NET_F_MQ);
> +
> +	return 0;
> +}
> +
> +static int
> +vhost_kernel_set_features(struct virtio_user_dev *dev, uint64_t features)
> +{
> +	/* We don't need memory protection here */
> +	features &= ~(1ULL << VIRTIO_F_IOMMU_PLATFORM);
> +	/* VHOST kernel does not know about below flags */
> +	features &= ~VHOST_KERNEL_GUEST_OFFLOADS_MASK;
> +	features &= ~VHOST_KERNEL_HOST_OFFLOADS_MASK;
> +	features &= ~(1ULL << VIRTIO_NET_F_MQ);
> +
> +	return vhost_kernel_ioctl(dev->vhostfds[0], VHOST_SET_FEATURES, &features);
> +}
> +
>  static uint64_t vhost_req_user_to_kernel[] = {
>  	[VHOST_USER_RESET_OWNER] = VHOST_RESET_OWNER,
> -	[VHOST_USER_SET_FEATURES] = VHOST_SET_FEATURES,
> -	[VHOST_USER_GET_FEATURES] = VHOST_GET_FEATURES,
>  	[VHOST_USER_SET_VRING_CALL] = VHOST_SET_VRING_CALL,
>  	[VHOST_USER_SET_VRING_NUM] = VHOST_SET_VRING_NUM,
>  	[VHOST_USER_SET_VRING_BASE] = VHOST_SET_VRING_BASE,
> @@ -150,51 +219,6 @@ prepare_vhost_memory_kernel(void)
>  	return vm;
>  }
>  
> -/* with below features, vhost kernel does not need to do the checksum and TSO,
> - * these info will be passed to virtio_user through virtio net header.
> - */
> -#define VHOST_KERNEL_GUEST_OFFLOADS_MASK	\
> -	((1ULL << VIRTIO_NET_F_GUEST_CSUM) |	\
> -	 (1ULL << VIRTIO_NET_F_GUEST_TSO4) |	\
> -	 (1ULL << VIRTIO_NET_F_GUEST_TSO6) |	\
> -	 (1ULL << VIRTIO_NET_F_GUEST_ECN)  |	\
> -	 (1ULL << VIRTIO_NET_F_GUEST_UFO))
> -
> -/* with below features, when flows from virtio_user to vhost kernel
> - * (1) if flows goes up through the kernel networking stack, it does not need
> - * to verify checksum, which can save CPU cycles;
> - * (2) if flows goes through a Linux bridge and outside from an interface
> - * (kernel driver), checksum and TSO will be done by GSO in kernel or even
> - * offloaded into real physical device.
> - */
> -#define VHOST_KERNEL_HOST_OFFLOADS_MASK		\
> -	((1ULL << VIRTIO_NET_F_HOST_TSO4) |	\
> -	 (1ULL << VIRTIO_NET_F_HOST_TSO6) |	\
> -	 (1ULL << VIRTIO_NET_F_CSUM))
> -
> -static unsigned int
> -tap_support_features(void)
> -{
> -	int tapfd;
> -	unsigned int tap_features;
> -
> -	tapfd = open(PATH_NET_TUN, O_RDWR);
> -	if (tapfd < 0) {
> -		PMD_DRV_LOG(ERR, "fail to open %s: %s",
> -			    PATH_NET_TUN, strerror(errno));
> -		return -1;
> -	}
> -
> -	if (ioctl(tapfd, TUNGETFEATURES, &tap_features) == -1) {
> -		PMD_DRV_LOG(ERR, "TUNGETFEATURES failed: %s", strerror(errno));
> -		close(tapfd);
> -		return -1;
> -	}
> -
> -	close(tapfd);
> -	return tap_features;
> -}
> -
>  static int
>  vhost_kernel_send_request(struct virtio_user_dev *dev,
>  		   enum vhost_user_request req,
> @@ -206,7 +230,6 @@ vhost_kernel_send_request(struct virtio_user_dev *dev,
>  	struct vhost_memory_kernel *vm = NULL;
>  	int vhostfd;
>  	unsigned int queue_sel;
> -	unsigned int features;
>  
>  	PMD_DRV_LOG(INFO, "%s", vhost_msg_strings[req]);
>  
> @@ -219,17 +242,6 @@ vhost_kernel_send_request(struct virtio_user_dev *dev,
>  		arg = (void *)vm;
>  	}
>  
> -	if (req_kernel == VHOST_SET_FEATURES) {
> -		/* We don't need memory protection here */
> -		*(uint64_t *)arg &= ~(1ULL << VIRTIO_F_IOMMU_PLATFORM);
> -
> -		/* VHOST kernel does not know about below flags */
> -		*(uint64_t *)arg &= ~VHOST_KERNEL_GUEST_OFFLOADS_MASK;
> -		*(uint64_t *)arg &= ~VHOST_KERNEL_HOST_OFFLOADS_MASK;
> -
> -		*(uint64_t *)arg &= ~(1ULL << VIRTIO_NET_F_MQ);
> -	}
> -
>  	switch (req_kernel) {
>  	case VHOST_SET_VRING_NUM:
>  	case VHOST_SET_VRING_ADDR:
> @@ -259,24 +271,6 @@ vhost_kernel_send_request(struct virtio_user_dev *dev,
>  		ret = ioctl(vhostfd, req_kernel, arg);
>  	}
>  
> -	if (!ret && req_kernel == VHOST_GET_FEATURES) {
> -		features = tap_support_features();
> -		/* with tap as the backend, all these features are supported
> -		 * but not claimed by vhost-net, so we add them back when
> -		 * reporting to upper layer.
> -		 */
> -		if (features & IFF_VNET_HDR) {
> -			*((uint64_t *)arg) |= VHOST_KERNEL_GUEST_OFFLOADS_MASK;
> -			*((uint64_t *)arg) |= VHOST_KERNEL_HOST_OFFLOADS_MASK;
> -		}
> -
> -		/* vhost_kernel will not declare this feature, but it does
> -		 * support multi-queue.
> -		 */
> -		if (features & IFF_MULTI_QUEUE)
> -			*(uint64_t *)arg |= (1ull << VIRTIO_NET_F_MQ);
> -	}
> -
>  	if (vm)
>  		free(vm);
>  
> @@ -407,6 +401,8 @@ vhost_kernel_enable_queue_pair(struct virtio_user_dev *dev,
>  struct virtio_user_backend_ops virtio_ops_kernel = {
>  	.setup = vhost_kernel_setup,
>  	.set_owner = vhost_kernel_set_owner,
> +	.get_features = vhost_kernel_get_features,
> +	.set_features = vhost_kernel_set_features,
>  	.send_request = vhost_kernel_send_request,
>  	.enable_qp = vhost_kernel_enable_queue_pair
>  };
> diff --git a/drivers/net/virtio/virtio_user/vhost_kernel_tap.c b/drivers/net/virtio/virtio_user/vhost_kernel_tap.c
> index eade702c5c..99096bdf39 100644
> --- a/drivers/net/virtio/virtio_user/vhost_kernel_tap.c
> +++ b/drivers/net/virtio/virtio_user/vhost_kernel_tap.c
> @@ -18,6 +18,29 @@
>  #include "../virtio_logs.h"
>  #include "../virtio.h"
>  
> +
> +int
> +tap_support_features(unsigned int *tap_features)
> +{
> +	int tapfd;
> +
> +	tapfd = open(PATH_NET_TUN, O_RDWR);
> +	if (tapfd < 0) {
> +		PMD_DRV_LOG(ERR, "fail to open %s: %s",
> +			    PATH_NET_TUN, strerror(errno));
> +		return -1;
> +	}
> +
> +	if (ioctl(tapfd, TUNGETFEATURES, tap_features) == -1) {
> +		PMD_DRV_LOG(ERR, "TUNGETFEATURES failed: %s", strerror(errno));
> +		close(tapfd);
> +		return -1;
> +	}
> +
> +	close(tapfd);
> +	return 0;
> +}
> +
>  int
>  vhost_kernel_tap_set_offload(int fd, uint64_t features)
>  {
> diff --git a/drivers/net/virtio/virtio_user/vhost_kernel_tap.h b/drivers/net/virtio/virtio_user/vhost_kernel_tap.h
> index 5c4447b296..ed03fce21e 100644
> --- a/drivers/net/virtio/virtio_user/vhost_kernel_tap.h
> +++ b/drivers/net/virtio/virtio_user/vhost_kernel_tap.h
> @@ -43,5 +43,6 @@ int vhost_kernel_open_tap(char **p_ifname, int hdr_size, int req_mq,
>  			 const char *mac, uint64_t features);
>  int vhost_kernel_tap_set_offload(int fd, uint64_t features);
>  int vhost_kernel_tap_set_queue(int fd, bool attach);
> +int tap_support_features(unsigned int *tap_features);
>  
>  #endif
> diff --git a/drivers/net/virtio/virtio_user/vhost_user.c b/drivers/net/virtio/virtio_user/vhost_user.c
> index 5ab15318ac..d204fa1eb0 100644
> --- a/drivers/net/virtio/virtio_user/vhost_user.c
> +++ b/drivers/net/virtio/virtio_user/vhost_user.c
> @@ -143,6 +143,62 @@ vhost_user_set_owner(struct virtio_user_dev *dev)
>  	return 0;
>  }
>  
> +static int
> +vhost_user_get_features(struct virtio_user_dev *dev, uint64_t *features)
> +{
> +	int ret;
> +	struct vhost_user_msg msg = {
> +		.request = VHOST_USER_GET_FEATURES,
> +		.flags = VHOST_USER_VERSION,
> +	};
> +
> +	ret = vhost_user_write(dev->vhostfd, &msg, NULL, 0);
> +	if (ret < 0)
> +		goto err;
> +
> +	ret = vhost_user_read(dev->vhostfd, &msg);
> +	if (ret < 0)
> +		goto err;
> +
> +	if (msg.request != VHOST_USER_GET_FEATURES) {
> +		PMD_DRV_LOG(ERR, "Unexpected request type (%d)", msg.request);
> +		goto err;
> +	}
> +
> +	if (msg.size != sizeof(*features)) {
> +		PMD_DRV_LOG(ERR, "Unexpected payload size (%d)", msg.size);
> +		goto err;
> +	}
> +
> +	*features = msg.payload.u64;
> +
> +	return 0;
> +err:
> +	PMD_DRV_LOG(ERR, "Failed to get backend features");
> +
On possibly socket-related errors, it's sometimes useful to print
sterror(errno). WDYT?
> +	return -1;
> +}
> +
> +static int
> +vhost_user_set_features(struct virtio_user_dev *dev, uint64_t features)
> +{
> +	int ret;
> +	struct vhost_user_msg msg = {
> +		.request = VHOST_USER_SET_FEATURES,
> +		.flags = VHOST_USER_VERSION,
> +		.size = sizeof(features),
> +		.payload.u64 = features,
> +	};
> +
> +	ret = vhost_user_write(dev->vhostfd, &msg, NULL, 0);
> +	if (ret < 0) {
> +		PMD_DRV_LOG(ERR, "Failed to set features");
> +		return -1;
> +	}
> +
> +	return 0;
> +}
> +
>  struct walk_arg {
>  	struct vhost_memory *vm;
>  	int *fds;
> @@ -249,8 +305,6 @@ static struct vhost_user_msg m;
>  
>  const char * const vhost_msg_strings[] = {
>  	[VHOST_USER_RESET_OWNER] = "VHOST_RESET_OWNER",
> -	[VHOST_USER_SET_FEATURES] = "VHOST_SET_FEATURES",
> -	[VHOST_USER_GET_FEATURES] = "VHOST_GET_FEATURES",
>  	[VHOST_USER_SET_VRING_CALL] = "VHOST_SET_VRING_CALL",
>  	[VHOST_USER_SET_VRING_NUM] = "VHOST_SET_VRING_NUM",
>  	[VHOST_USER_SET_VRING_BASE] = "VHOST_SET_VRING_BASE",
> @@ -299,7 +353,6 @@ vhost_user_sock(struct virtio_user_dev *dev,
>  				(1ULL << VHOST_USER_PROTOCOL_F_STATUS))))
>  			return -ENOTSUP;
>  		/* Fallthrough */
> -	case VHOST_USER_GET_FEATURES:
>  	case VHOST_USER_GET_PROTOCOL_FEATURES:
>  		need_reply = 1;
>  		break;
> @@ -313,7 +366,6 @@ vhost_user_sock(struct virtio_user_dev *dev,
>  		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:
>  		msg.payload.u64 = *((__u64 *)arg);
> @@ -393,7 +445,6 @@ vhost_user_sock(struct virtio_user_dev *dev,
>  		}
>  
>  		switch (req) {
> -		case VHOST_USER_GET_FEATURES:
>  		case VHOST_USER_GET_STATUS:
>  		case VHOST_USER_GET_PROTOCOL_FEATURES:
>  			if (msg.size != sizeof(m.payload.u64)) {
> @@ -531,6 +582,8 @@ vhost_user_enable_queue_pair(struct virtio_user_dev *dev,
>  struct virtio_user_backend_ops virtio_ops_user = {
>  	.setup = vhost_user_setup,
>  	.set_owner = vhost_user_set_owner,
> +	.get_features = vhost_user_get_features,
> +	.set_features = vhost_user_set_features,
>  	.send_request = vhost_user_sock,
>  	.enable_qp = vhost_user_enable_queue_pair
>  };
> diff --git a/drivers/net/virtio/virtio_user/vhost_vdpa.c b/drivers/net/virtio/virtio_user/vhost_vdpa.c
> index f405b6b86a..c0a9b5b767 100644
> --- a/drivers/net/virtio/virtio_user/vhost_vdpa.c
> +++ b/drivers/net/virtio/virtio_user/vhost_vdpa.c
> @@ -38,8 +38,6 @@
>  
>  static uint64_t vhost_req_user_to_vdpa[] = {
>  	[VHOST_USER_RESET_OWNER] = VHOST_RESET_OWNER,
> -	[VHOST_USER_SET_FEATURES] = VHOST_SET_FEATURES,
> -	[VHOST_USER_GET_FEATURES] = VHOST_GET_FEATURES,
>  	[VHOST_USER_SET_VRING_CALL] = VHOST_SET_VRING_CALL,
>  	[VHOST_USER_SET_VRING_NUM] = VHOST_SET_VRING_NUM,
>  	[VHOST_USER_SET_VRING_BASE] = VHOST_SET_VRING_BASE,
> @@ -101,6 +99,32 @@ vhost_vdpa_set_owner(struct virtio_user_dev *dev)
>  	return vhost_vdpa_ioctl(dev->vhostfd, VHOST_SET_OWNER, NULL);
>  }
>  
> +static int
> +vhost_vdpa_get_features(struct virtio_user_dev *dev, uint64_t *features)
> +{
> +	int ret;
> +
> +	ret = vhost_vdpa_ioctl(dev->vhostfd, VHOST_GET_FEATURES, features);
> +	if (ret) {
> +		PMD_DRV_LOG(ERR, "Failed to get features");
> +		return -1;
> +	}
> +
> +	/* Multiqueue not supported for now */
> +	*features &= ~(1ULL << VIRTIO_NET_F_MQ);
> +
> +	return 0;
> +}
> +
> +static int
> +vhost_vdpa_set_features(struct virtio_user_dev *dev, uint64_t features)
> +{
> +	/* WORKAROUND */
> +	features |= 1ULL << VIRTIO_F_IOMMU_PLATFORM;
> +
> +	return vhost_vdpa_ioctl(dev->vhostfd, VHOST_SET_FEATURES, &features);
> +}
> +
>  static int
>  vhost_vdpa_dma_map(struct virtio_user_dev *dev, void *addr,
>  				  uint64_t iova, size_t len)
> @@ -227,14 +251,6 @@ vhost_vdpa_send_request(struct virtio_user_dev *dev,
>  	if (req_vdpa == VHOST_SET_MEM_TABLE)
>  		return vhost_vdpa_dma_map_all(dev);
>  
> -	if (req_vdpa == VHOST_SET_FEATURES) {
> -		/* WORKAROUND */
> -		*(uint64_t *)arg |= 1ULL << VIRTIO_F_IOMMU_PLATFORM;
> -
> -		/* Multiqueue not supported for now */
> -		*(uint64_t *)arg &= ~(1ULL << VIRTIO_NET_F_MQ);
> -	}
> -
>  	switch (req_vdpa) {
>  	case VHOST_SET_VRING_NUM:
>  	case VHOST_SET_VRING_ADDR:
> @@ -313,6 +329,8 @@ vhost_vdpa_enable_queue_pair(struct virtio_user_dev *dev,
>  struct virtio_user_backend_ops virtio_ops_vdpa = {
>  	.setup = vhost_vdpa_setup,
>  	.set_owner = vhost_vdpa_set_owner,
> +	.get_features = vhost_vdpa_get_features,
> +	.set_features = vhost_vdpa_set_features,
>  	.send_request = vhost_vdpa_send_request,
>  	.enable_qp = vhost_vdpa_enable_queue_pair,
>  	.dma_map = vhost_vdpa_dma_map,
> diff --git a/drivers/net/virtio/virtio_user/virtio_user_dev.c b/drivers/net/virtio/virtio_user/virtio_user_dev.c
> index f8e4581951..0a85d058a8 100644
> --- a/drivers/net/virtio/virtio_user/virtio_user_dev.c
> +++ b/drivers/net/virtio/virtio_user/virtio_user_dev.c
> @@ -141,7 +141,7 @@ virtio_user_dev_set_features(struct virtio_user_dev *dev)
>  	/* Strip VIRTIO_NET_F_CTRL_VQ, as devices do not really need to know */
>  	features &= ~(1ull << VIRTIO_NET_F_CTRL_VQ);
>  	features &= ~(1ull << VIRTIO_NET_F_STATUS);
> -	ret = dev->ops->send_request(dev, VHOST_USER_SET_FEATURES, &features);
> +	ret = dev->ops->set_features(dev, features);
>  	if (ret < 0)
>  		goto error;
>  	PMD_DRV_LOG(INFO, "set features: %" PRIx64, features);
> @@ -488,8 +488,7 @@ virtio_user_dev_init(struct virtio_user_dev *dev, char *path, int queues,
>  			return -1;
>  		}
>  
> -		if (dev->ops->send_request(dev, VHOST_USER_GET_FEATURES,
> -					   &dev->device_features) < 0) {
> +		if (dev->ops->get_features(dev, &dev->device_features) < 0) {
>  			PMD_INIT_LOG(ERR, "get_features failed: %s",
>  				     strerror(errno));
>  			return -1;
> diff --git a/drivers/net/virtio/virtio_user_ethdev.c b/drivers/net/virtio/virtio_user_ethdev.c
> index 283f5c7a36..4d2635c8aa 100644
> --- a/drivers/net/virtio/virtio_user_ethdev.c
> +++ b/drivers/net/virtio/virtio_user_ethdev.c
> @@ -85,8 +85,7 @@ virtio_user_server_reconnect(struct virtio_user_dev *dev)
>  
>  	virtio_set_status(hw, VIRTIO_CONFIG_STATUS_DRIVER);
>  
> -	if (dev->ops->send_request(dev, VHOST_USER_GET_FEATURES,
> -				   &dev->device_features) < 0) {
> +	if (dev->ops->get_features(dev, &dev->device_features) < 0) {
>  		PMD_INIT_LOG(ERR, "get_features failed: %s",
>  			     strerror(errno));
>  		return -1;
> 

-- 
Adrián Moreno