[v2,4/5] vhost: unify message handling function signature

  Each vhost-user message handling function will return an int result
which is described in the new enum vh_result: error, OK and reply.
All functions will now have two arguments, virtio_net double pointer
and VhostUserMsg pointer.

Signed-off-by: Nikolay Nikolaev <nicknickolaev@gmail.com>
---
 lib/librte_vhost/vhost_user.c |  219 ++++++++++++++++++++++++-----------------
 1 file changed, 130 insertions(+), 89 deletions(-)
  

On 07/19/2018 09:13 PM, Nikolay Nikolaev wrote:
> Each vhost-user message handling function will return an int result
> which is described in the new enum vh_result: error, OK and reply.
> All functions will now have two arguments, virtio_net double pointer
> and VhostUserMsg pointer.
> 
> Signed-off-by: Nikolay Nikolaev <nicknickolaev@gmail.com>
> ---
>   lib/librte_vhost/vhost_user.c |  219 ++++++++++++++++++++++++-----------------
>   1 file changed, 130 insertions(+), 89 deletions(-)

Adding Ilya in cc, who has submitted a patch that seems to be
complementary with yours: http://patches.dpdk.org/patch/44168/

Other than that, it looks good to me:
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>

Thanks,
Maxime
> 
> diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
> index b408460f0..6b39d1e30 100644
> --- a/lib/librte_vhost/vhost_user.c
> +++ b/lib/librte_vhost/vhost_user.c
> @@ -71,6 +71,16 @@ static const char *vhost_message_str[VHOST_USER_MAX] = {
>   	[VHOST_USER_CRYPTO_CLOSE_SESS] = "VHOST_USER_CRYPTO_CLOSE_SESS",
>   };
>   
> +/* The possible results of a message handling function */
> +enum vh_result {
> +	/* Message handling failed */
> +	VH_RESULT_ERR   = -1,
> +	/* Message handling successful */
> +	VH_RESULT_OK    =  0,
> +	/* Message handling successful and reply prepared */
> +	VH_RESULT_REPLY =  1,
> +};
> +
>   static uint64_t
>   get_blk_size(int fd)
>   {
> @@ -127,27 +137,31 @@ vhost_backend_cleanup(struct virtio_net *dev)
>    * the device hasn't been initialised.
>    */
>   static int
> -vhost_user_set_owner(void)
> +vhost_user_set_owner(struct virtio_net **pdev __rte_unused,
> +		VhostUserMsg * msg __rte_unused)
>   {
> -	return 0;
> +	return VH_RESULT_OK;
>   }
>   
>   static int
> -vhost_user_reset_owner(struct virtio_net *dev)
> +vhost_user_reset_owner(struct virtio_net **pdev,
> +		VhostUserMsg * msg __rte_unused)
>   {
> +	struct virtio_net *dev = *pdev;
>   	vhost_destroy_device_notify(dev);
>   
>   	cleanup_device(dev, 0);
>   	reset_device(dev);
> -	return 0;
> +	return VH_RESULT_OK;
>   }
>   
>   /*
>    * The features that we support are requested.
>    */
> -static uint64_t
> -vhost_user_get_features(struct virtio_net *dev, VhostUserMsg *msg)
> +static int
> +vhost_user_get_features(struct virtio_net **pdev, VhostUserMsg *msg)
>   {
> +	struct virtio_net *dev = *pdev;
>   	uint64_t features = 0;
>   
>   	rte_vhost_driver_get_features(dev->ifname, &features);
> @@ -155,15 +169,16 @@ vhost_user_get_features(struct virtio_net *dev, VhostUserMsg *msg)
>   	msg->payload.u64 = features;
>   	msg->size = sizeof(msg->payload.u64);
>   
> -	return features;
> +	return VH_RESULT_REPLY;
>   }
>   
>   /*
>    * The queue number that we support are requested.
>    */
> -static uint32_t
> -vhost_user_get_queue_num(struct virtio_net *dev, VhostUserMsg *msg)
> +static int
> +vhost_user_get_queue_num(struct virtio_net **pdev, VhostUserMsg *msg)
>   {
> +	struct virtio_net *dev = *pdev;
>   	uint32_t queue_num = 0;
>   
>   	rte_vhost_driver_get_queue_num(dev->ifname, &queue_num);
> @@ -171,15 +186,17 @@ vhost_user_get_queue_num(struct virtio_net *dev, VhostUserMsg *msg)
>   	msg->payload.u64 = (uint64_t)queue_num;
>   	msg->size = sizeof(msg->payload.u64);
>   
> -	return queue_num;
> +	return VH_RESULT_REPLY;
>   }
>   
>   /*
>    * We receive the negotiated features supported by us and the virtio device.
>    */
>   static int
> -vhost_user_set_features(struct virtio_net *dev, uint64_t features)
> +vhost_user_set_features(struct virtio_net **pdev, VhostUserMsg *msg)
>   {
> +	struct virtio_net *dev = *pdev;
> +	uint64_t features = msg->payload.u64;
>   	uint64_t vhost_features = 0;
>   	struct rte_vdpa_device *vdpa_dev;
>   	int did = -1;
> @@ -189,12 +206,12 @@ vhost_user_set_features(struct virtio_net *dev, uint64_t features)
>   		RTE_LOG(ERR, VHOST_CONFIG,
>   			"(%d) received invalid negotiated features.\n",
>   			dev->vid);
> -		return -1;
> +		return VH_RESULT_ERR;
>   	}
>   
>   	if (dev->flags & VIRTIO_DEV_RUNNING) {
>   		if (dev->features == features)
> -			return 0;
> +			return VH_RESULT_OK;
>   
>   		/*
>   		 * Error out if master tries to change features while device is
> @@ -205,7 +222,7 @@ vhost_user_set_features(struct virtio_net *dev, uint64_t features)
>   			RTE_LOG(ERR, VHOST_CONFIG,
>   				"(%d) features changed while device is running.\n",
>   				dev->vid);
> -			return -1;
> +			return VH_RESULT_ERR;
>   		}
>   
>   		if (dev->notify_ops->features_changed)
> @@ -250,16 +267,17 @@ vhost_user_set_features(struct virtio_net *dev, uint64_t features)
>   	if (vdpa_dev && vdpa_dev->ops->set_features)
>   		vdpa_dev->ops->set_features(dev->vid);
>   
> -	return 0;
> +	return VH_RESULT_OK;
>   }
>   
>   /*
>    * The virtio device sends us the size of the descriptor ring.
>    */
>   static int
> -vhost_user_set_vring_num(struct virtio_net *dev,
> +vhost_user_set_vring_num(struct virtio_net **pdev,
>   			 VhostUserMsg *msg)
>   {
> +	struct virtio_net *dev = *pdev;
>   	struct vhost_virtqueue *vq = dev->virtqueue[msg->payload.state.index];
>   
>   	vq->size = msg->payload.state.num;
> @@ -272,7 +290,7 @@ vhost_user_set_vring_num(struct virtio_net *dev,
>   	if ((vq->size & (vq->size - 1)) || vq->size > 32768) {
>   		RTE_LOG(ERR, VHOST_CONFIG,
>   			"invalid virtqueue size %u\n", vq->size);
> -		return -1;
> +		return VH_RESULT_ERR;
>   	}
>   
>   	if (dev->dequeue_zero_copy) {
> @@ -298,7 +316,7 @@ vhost_user_set_vring_num(struct virtio_net *dev,
>   		if (!vq->shadow_used_packed) {
>   			RTE_LOG(ERR, VHOST_CONFIG,
>   					"failed to allocate memory for shadow used ring.\n");
> -			return -1;
> +			return VH_RESULT_ERR;
>   		}
>   
>   	} else {
> @@ -308,7 +326,7 @@ vhost_user_set_vring_num(struct virtio_net *dev,
>   		if (!vq->shadow_used_split) {
>   			RTE_LOG(ERR, VHOST_CONFIG,
>   					"failed to allocate memory for shadow used ring.\n");
> -			return -1;
> +			return VH_RESULT_ERR;
>   		}
>   	}
>   
> @@ -318,10 +336,10 @@ vhost_user_set_vring_num(struct virtio_net *dev,
>   	if (!vq->batch_copy_elems) {
>   		RTE_LOG(ERR, VHOST_CONFIG,
>   			"failed to allocate memory for batching copy.\n");
> -		return -1;
> +		return VH_RESULT_ERR;
>   	}
>   
> -	return 0;
> +	return VH_RESULT_OK;
>   }
>   
>   /*
> @@ -619,12 +637,12 @@ translate_ring_addresses(struct virtio_net *dev, int vq_index)
>   static int
>   vhost_user_set_vring_addr(struct virtio_net **pdev, VhostUserMsg *msg)
>   {
> +	struct virtio_net *dev = *pdev;
>   	struct vhost_virtqueue *vq;
>   	struct vhost_vring_addr *addr = &msg->payload.addr;
> -	struct virtio_net *dev = *pdev;
>   
>   	if (dev->mem == NULL)
> -		return -1;
> +		return VH_RESULT_ERR;
>   
>   	/* addr->index refers to the queue index. The txq 1, rxq is 0. */
>   	vq = dev->virtqueue[msg->payload.addr.index];
> @@ -641,27 +659,28 @@ vhost_user_set_vring_addr(struct virtio_net **pdev, VhostUserMsg *msg)
>   				(1ULL << VHOST_USER_F_PROTOCOL_FEATURES))) {
>   		dev = translate_ring_addresses(dev, msg->payload.addr.index);
>   		if (!dev)
> -			return -1;
> +			return VH_RESULT_ERR;
>   
>   		*pdev = dev;
>   	}
>   
> -	return 0;
> +	return VH_RESULT_OK;
>   }
>   
>   /*
>    * The virtio device sends us the available ring last used index.
>    */
>   static int
> -vhost_user_set_vring_base(struct virtio_net *dev,
> +vhost_user_set_vring_base(struct virtio_net **pdev,
>   			  VhostUserMsg *msg)
>   {
> +	struct virtio_net *dev = *pdev;
>   	dev->virtqueue[msg->payload.state.index]->last_used_idx  =
>   			msg->payload.state.num;
>   	dev->virtqueue[msg->payload.state.index]->last_avail_idx =
>   			msg->payload.state.num;
>   
> -	return 0;
> +	return VH_RESULT_OK;
>   }
>   
>   static int
> @@ -802,7 +821,7 @@ vhost_user_set_mem_table(struct virtio_net **pdev, VhostUserMsg *msg)
>   	if (memory.nregions > VHOST_MEMORY_MAX_NREGIONS) {
>   		RTE_LOG(ERR, VHOST_CONFIG,
>   			"too many memory regions (%u)\n", memory.nregions);
> -		return -1;
> +		return VH_RESULT_ERR;
>   	}
>   
>   	if (dev->mem && !vhost_memory_changed(&memory, dev->mem)) {
> @@ -812,7 +831,7 @@ vhost_user_set_mem_table(struct virtio_net **pdev, VhostUserMsg *msg)
>   		for (i = 0; i < memory.nregions; i++)
>   			close(msg->fds[i]);
>   
> -		return 0;
> +		return VH_RESULT_OK;
>   	}
>   
>   	if (dev->mem) {
> @@ -831,7 +850,7 @@ vhost_user_set_mem_table(struct virtio_net **pdev, VhostUserMsg *msg)
>   				"(%d) failed to allocate memory "
>   				"for dev->guest_pages\n",
>   				dev->vid);
> -			return -1;
> +			return VH_RESULT_ERR;
>   		}
>   	}
>   
> @@ -841,7 +860,7 @@ vhost_user_set_mem_table(struct virtio_net **pdev, VhostUserMsg *msg)
>   		RTE_LOG(ERR, VHOST_CONFIG,
>   			"(%d) failed to allocate memory for dev->mem\n",
>   			dev->vid);
> -		return -1;
> +		return VH_RESULT_ERR;
>   	}
>   	dev->mem->nregions = memory.nregions;
>   
> @@ -938,7 +957,7 @@ vhost_user_set_mem_table(struct virtio_net **pdev, VhostUserMsg *msg)
>   
>   			dev = translate_ring_addresses(dev, i);
>   			if (!dev)
> -				return -1;
> +				return VH_RESULT_ERR;
>   
>   			*pdev = dev;
>   		}
> @@ -946,13 +965,13 @@ vhost_user_set_mem_table(struct virtio_net **pdev, VhostUserMsg *msg)
>   
>   	dump_guest_pages(dev);
>   
> -	return 0;
> +	return VH_RESULT_OK;
>   
>   err_mmap:
>   	free_mem_region(dev);
>   	rte_free(dev->mem);
>   	dev->mem = NULL;
> -	return -1;
> +	return VH_RESULT_ERR;
>   }
>   
>   static bool
> @@ -994,9 +1013,10 @@ virtio_is_ready(struct virtio_net *dev)
>   	return 1;
>   }
>   
> -static void
> -vhost_user_set_vring_call(struct virtio_net *dev, VhostUserMsg *msg)
> +static int
> +vhost_user_set_vring_call(struct virtio_net **pdev, VhostUserMsg *msg)
>   {
> +	struct virtio_net *dev = *pdev;
>   	struct vhost_vring_file file;
>   	struct vhost_virtqueue *vq;
>   
> @@ -1013,22 +1033,26 @@ vhost_user_set_vring_call(struct virtio_net *dev, VhostUserMsg *msg)
>   		close(vq->callfd);
>   
>   	vq->callfd = file.fd;
> +
> +	return VH_RESULT_OK;
>   }
>   
> -static void vhost_user_set_vring_err(struct virtio_net *dev __rte_unused,
> +static int vhost_user_set_vring_err(struct virtio_net **pdev __rte_unused,
>   			VhostUserMsg *msg)
>   {
>   	if (!(msg->payload.u64 & VHOST_USER_VRING_NOFD_MASK))
>   		close(msg->fds[0]);
>   	RTE_LOG(INFO, VHOST_CONFIG, "not implemented\n");
> +
> +	return VH_RESULT_OK;
>   }
>   
> -static void
> +static int
>   vhost_user_set_vring_kick(struct virtio_net **pdev, VhostUserMsg *msg)
>   {
> +	struct virtio_net *dev = *pdev;
>   	struct vhost_vring_file file;
>   	struct vhost_virtqueue *vq;
> -	struct virtio_net *dev = *pdev;
>   
>   	file.index = msg->payload.u64 & VHOST_USER_VRING_IDX_MASK;
>   	if (msg->payload.u64 & VHOST_USER_VRING_NOFD_MASK)
> @@ -1041,7 +1065,7 @@ vhost_user_set_vring_kick(struct virtio_net **pdev, VhostUserMsg *msg)
>   	/* Interpret ring addresses only when ring is started. */
>   	dev = translate_ring_addresses(dev, file.index);
>   	if (!dev)
> -		return;
> +		return VH_RESULT_OK;
>   
>   	*pdev = dev;
>   
> @@ -1058,6 +1082,8 @@ vhost_user_set_vring_kick(struct virtio_net **pdev, VhostUserMsg *msg)
>   	if (vq->kickfd >= 0)
>   		close(vq->kickfd);
>   	vq->kickfd = file.fd;
> +
> +	return VH_RESULT_OK;
>   }
>   
>   static void
> @@ -1080,9 +1106,10 @@ free_zmbufs(struct vhost_virtqueue *vq)
>    * when virtio is stopped, qemu will send us the GET_VRING_BASE message.
>    */
>   static int
> -vhost_user_get_vring_base(struct virtio_net *dev,
> +vhost_user_get_vring_base(struct virtio_net **pdev,
>   			  VhostUserMsg *msg)
>   {
> +	struct virtio_net *dev = *pdev;
>   	struct vhost_virtqueue *vq = dev->virtqueue[msg->payload.state.index];
>   
>   	/* We have to stop the queue (virtio) if it is running. */
> @@ -1127,7 +1154,7 @@ vhost_user_get_vring_base(struct virtio_net *dev,
>   
>   	msg->size = sizeof(msg->payload.state);
>   
> -	return 0;
> +	return VH_RESULT_OK;
>   }
>   
>   /*
> @@ -1135,9 +1162,10 @@ vhost_user_get_vring_base(struct virtio_net *dev,
>    * enable the virtio queue pair.
>    */
>   static int
> -vhost_user_set_vring_enable(struct virtio_net *dev,
> +vhost_user_set_vring_enable(struct virtio_net **pdev,
>   			    VhostUserMsg *msg)
>   {
> +	struct virtio_net *dev = *pdev;
>   	int enable = (int)msg->payload.state.num;
>   	int index = (int)msg->payload.state.index;
>   	struct rte_vdpa_device *vdpa_dev;
> @@ -1158,13 +1186,14 @@ vhost_user_set_vring_enable(struct virtio_net *dev,
>   
>   	dev->virtqueue[index]->enabled = enable;
>   
> -	return 0;
> +	return VH_RESULT_OK;
>   }
>   
> -static void
> -vhost_user_get_protocol_features(struct virtio_net *dev,
> +static int
> +vhost_user_get_protocol_features(struct virtio_net **pdev,
>   				 VhostUserMsg *msg)
>   {
> +	struct virtio_net *dev = *pdev;
>   	uint64_t features, protocol_features;
>   
>   	rte_vhost_driver_get_features(dev->ifname, &features);
> @@ -1181,35 +1210,42 @@ vhost_user_get_protocol_features(struct virtio_net *dev,
>   
>   	msg->payload.u64 = protocol_features;
>   	msg->size = sizeof(msg->payload.u64);
> +
> +	return VH_RESULT_OK;
>   }
>   
> -static void
> -vhost_user_set_protocol_features(struct virtio_net *dev,
> -				 uint64_t protocol_features)
> +static int
> +vhost_user_set_protocol_features(struct virtio_net **pdev,
> +				 VhostUserMsg *msg)
>   {
> +	struct virtio_net *dev = *pdev;
> +	uint64_t protocol_features = msg->payload.u64;
>   	if (protocol_features & ~VHOST_USER_PROTOCOL_FEATURES)
> -		return;
> +		return VH_RESULT_OK;
>   
>   	dev->protocol_features = protocol_features;
> +
> +	return VH_RESULT_OK;
>   }
>   
>   static int
> -vhost_user_set_log_base(struct virtio_net *dev, VhostUserMsg *msg)
> +vhost_user_set_log_base(struct virtio_net **pdev, VhostUserMsg *msg)
>   {
> +	struct virtio_net *dev = *pdev;
>   	int fd = msg->fds[0];
>   	uint64_t size, off;
>   	void *addr;
>   
>   	if (fd < 0) {
>   		RTE_LOG(ERR, VHOST_CONFIG, "invalid log fd: %d\n", fd);
> -		return -1;
> +		return VH_RESULT_ERR;
>   	}
>   
>   	if (msg->size != sizeof(VhostUserLog)) {
>   		RTE_LOG(ERR, VHOST_CONFIG,
>   			"invalid log base msg size: %"PRId32" != %d\n",
>   			msg->size, (int)sizeof(VhostUserLog));
> -		return -1;
> +		return VH_RESULT_ERR;
>   	}
>   
>   	size = msg->payload.log.mmap_size;
> @@ -1220,7 +1256,7 @@ vhost_user_set_log_base(struct virtio_net *dev, VhostUserMsg *msg)
>   		RTE_LOG(ERR, VHOST_CONFIG,
>   			"log offset %#"PRIx64" exceeds log size %#"PRIx64"\n",
>   			off, size);
> -		return -1;
> +		return VH_RESULT_ERR;
>   	}
>   
>   	RTE_LOG(INFO, VHOST_CONFIG,
> @@ -1235,7 +1271,7 @@ vhost_user_set_log_base(struct virtio_net *dev, VhostUserMsg *msg)
>   	close(fd);
>   	if (addr == MAP_FAILED) {
>   		RTE_LOG(ERR, VHOST_CONFIG, "mmap log base failed!\n");
> -		return -1;
> +		return VH_RESULT_ERR;
>   	}
>   
>   	/*
> @@ -1251,14 +1287,16 @@ vhost_user_set_log_base(struct virtio_net *dev, VhostUserMsg *msg)
>   
>   	msg->size = sizeof(msg->payload.u64);
>   
> -	return 0;
> +	return VH_RESULT_OK;
>   }
>   
> -static void
> -vhost_user_set_log_fd(struct virtio_net *dev __rte_unused, VhostUserMsg *msg)
> +static int
> +vhost_user_set_log_fd(struct virtio_net **pdev __rte_unused, VhostUserMsg *msg)
>   {
>   	close(msg->fds[0]);
>   	RTE_LOG(INFO, VHOST_CONFIG, "not implemented.\n");
> +
> +	return VH_RESULT_OK;
>   }
>   
>   /*
> @@ -1270,8 +1308,9 @@ vhost_user_set_log_fd(struct virtio_net *dev __rte_unused, VhostUserMsg *msg)
>    * a flag 'broadcast_rarp' to let rte_vhost_dequeue_burst() inject it.
>    */
>   static int
> -vhost_user_send_rarp(struct virtio_net *dev, VhostUserMsg *msg)
> +vhost_user_send_rarp(struct virtio_net **pdev, VhostUserMsg *msg)
>   {
> +	struct virtio_net *dev = *pdev;
>   	uint8_t *mac = (uint8_t *)&msg->payload.u64;
>   	struct rte_vdpa_device *vdpa_dev;
>   	int did = -1;
> @@ -1295,40 +1334,42 @@ vhost_user_send_rarp(struct virtio_net *dev, VhostUserMsg *msg)
>   	if (vdpa_dev && vdpa_dev->ops->migration_done)
>   		vdpa_dev->ops->migration_done(dev->vid);
>   
> -	return 0;
> +	return VH_RESULT_OK;
>   }
>   
>   static int
> -vhost_user_net_set_mtu(struct virtio_net *dev, VhostUserMsg *msg)
> +vhost_user_net_set_mtu(struct virtio_net **pdev, VhostUserMsg *msg)
>   {
> +	struct virtio_net *dev = *pdev;
>   	if (msg->payload.u64 < VIRTIO_MIN_MTU ||
>   			msg->payload.u64 > VIRTIO_MAX_MTU) {
>   		RTE_LOG(ERR, VHOST_CONFIG, "Invalid MTU size (%"PRIu64")\n",
>   				msg->payload.u64);
>   
> -		return -1;
> +		return VH_RESULT_ERR;
>   	}
>   
>   	dev->mtu = msg->payload.u64;
>   
> -	return 0;
> +	return VH_RESULT_OK;
>   }
>   
>   static int
> -vhost_user_set_req_fd(struct virtio_net *dev, VhostUserMsg *msg)
> +vhost_user_set_req_fd(struct virtio_net **pdev, VhostUserMsg *msg)
>   {
> +	struct virtio_net *dev = *pdev;
>   	int fd = msg->fds[0];
>   
>   	if (fd < 0) {
>   		RTE_LOG(ERR, VHOST_CONFIG,
>   				"Invalid file descriptor for slave channel (%d)\n",
>   				fd);
> -		return -1;
> +		return VH_RESULT_ERR;
>   	}
>   
>   	dev->slave_req_fd = fd;
>   
> -	return 0;
> +	return VH_RESULT_OK;
>   }
>   
>   static int
> @@ -1393,7 +1434,7 @@ vhost_user_iotlb_msg(struct virtio_net **pdev, VhostUserMsg *msg)
>   		len = imsg->size;
>   		vva = qva_to_vva(dev, imsg->uaddr, &len);
>   		if (!vva)
> -			return -1;
> +			return VH_RESULT_ERR;
>   
>   		for (i = 0; i < dev->nr_vring; i++) {
>   			struct vhost_virtqueue *vq = dev->virtqueue[i];
> @@ -1419,10 +1460,10 @@ vhost_user_iotlb_msg(struct virtio_net **pdev, VhostUserMsg *msg)
>   	default:
>   		RTE_LOG(ERR, VHOST_CONFIG, "Invalid IOTLB message type (%d)\n",
>   				imsg->type);
> -		return -1;
> +		return VH_RESULT_ERR;
>   	}
>   
> -	return 0;
> +	return VH_RESULT_OK;
>   }
>   
>   /* return bytes# of read on success or negative val on failure. */
> @@ -1671,28 +1712,28 @@ vhost_user_msg_handler(int vid, int fd)
>   
>   	switch (msg.request.master) {
>   	case VHOST_USER_GET_FEATURES:
> -		vhost_user_get_features(dev, &msg);
> +		ret = vhost_user_get_features(&dev, &msg);
>   		send_vhost_reply(fd, &msg);
>   		break;
>   	case VHOST_USER_SET_FEATURES:
> -		ret = vhost_user_set_features(dev, msg.payload.u64);
> +		ret = vhost_user_set_features(&dev, &msg);
>   		if (ret)
>   			return -1;
>   		break;
>   
>   	case VHOST_USER_GET_PROTOCOL_FEATURES:
> -		vhost_user_get_protocol_features(dev, &msg);
> +		ret = vhost_user_get_protocol_features(&dev, &msg);
>   		send_vhost_reply(fd, &msg);
>   		break;
>   	case VHOST_USER_SET_PROTOCOL_FEATURES:
> -		vhost_user_set_protocol_features(dev, msg.payload.u64);
> +		ret = vhost_user_set_protocol_features(&dev, &msg);
>   		break;
>   
>   	case VHOST_USER_SET_OWNER:
> -		vhost_user_set_owner();
> +		ret = vhost_user_set_owner(&dev, &msg);
>   		break;
>   	case VHOST_USER_RESET_OWNER:
> -		vhost_user_reset_owner(dev);
> +		ret = vhost_user_reset_owner(&dev, &msg);
>   		break;
>   
>   	case VHOST_USER_SET_MEM_TABLE:
> @@ -1700,57 +1741,57 @@ vhost_user_msg_handler(int vid, int fd)
>   		break;
>   
>   	case VHOST_USER_SET_LOG_BASE:
> -		vhost_user_set_log_base(dev, &msg);
> +		ret = vhost_user_set_log_base(&dev, &msg);
>   		send_vhost_reply(fd, &msg);
>   		break;
>   	case VHOST_USER_SET_LOG_FD:
> -		vhost_user_set_log_fd(dev, &msg);
> +		ret = vhost_user_set_log_fd(&dev, &msg);
>   		break;
>   
>   	case VHOST_USER_SET_VRING_NUM:
> -		vhost_user_set_vring_num(dev, &msg);
> +		ret = vhost_user_set_vring_num(&dev, &msg);
>   		break;
>   	case VHOST_USER_SET_VRING_ADDR:
> -		vhost_user_set_vring_addr(&dev, &msg);
> +		ret = vhost_user_set_vring_addr(&dev, &msg);
>   		break;
>   	case VHOST_USER_SET_VRING_BASE:
> -		vhost_user_set_vring_base(dev, &msg);
> +		ret = vhost_user_set_vring_base(&dev, &msg);
>   		break;
>   
>   	case VHOST_USER_GET_VRING_BASE:
> -		vhost_user_get_vring_base(dev, &msg);
> +		ret = vhost_user_get_vring_base(&dev, &msg);
>   		send_vhost_reply(fd, &msg);
>   		break;
>   
>   	case VHOST_USER_SET_VRING_KICK:
> -		vhost_user_set_vring_kick(&dev, &msg);
> +		ret = vhost_user_set_vring_kick(&dev, &msg);
>   		break;
>   	case VHOST_USER_SET_VRING_CALL:
> -		vhost_user_set_vring_call(dev, &msg);
> +		ret = vhost_user_set_vring_call(&dev, &msg);
>   		break;
>   
>   	case VHOST_USER_SET_VRING_ERR:
> -		vhost_user_set_vring_err(dev, &msg);
> +		ret = vhost_user_set_vring_err(&dev, &msg);
>   		break;
>   
>   	case VHOST_USER_GET_QUEUE_NUM:
> -		vhost_user_get_queue_num(dev, &msg);
> +		ret = vhost_user_get_queue_num(&dev, &msg);
>   		send_vhost_reply(fd, &msg);
>   		break;
>   
>   	case VHOST_USER_SET_VRING_ENABLE:
> -		vhost_user_set_vring_enable(dev, &msg);
> +		ret = vhost_user_set_vring_enable(&dev, &msg);
>   		break;
>   	case VHOST_USER_SEND_RARP:
> -		vhost_user_send_rarp(dev, &msg);
> +		ret = vhost_user_send_rarp(&dev, &msg);
>   		break;
>   
>   	case VHOST_USER_NET_SET_MTU:
> -		ret = vhost_user_net_set_mtu(dev, &msg);
> +		ret = vhost_user_net_set_mtu(&dev, &msg);
>   		break;
>   
>   	case VHOST_USER_SET_SLAVE_REQ_FD:
> -		ret = vhost_user_set_req_fd(dev, &msg);
> +		ret = vhost_user_set_req_fd(&dev, &msg);
>   		break;
>   
>   	case VHOST_USER_IOTLB_MSG:
>