[dpdk-dev] [PATCH 29/40] net/virtio: add Virtio-user vring file ops

[Xia, Chenbo]

Hi Maxime,

> -----Original Message-----
> From: Maxime Coquelin <maxime.coquelin at redhat.com>
> Sent: Monday, December 21, 2020 5:14 AM
> To: dev at dpdk.org; Xia, Chenbo <chenbo.xia at intel.com>; olivier.matz at 6wind.com;
> amorenoz at redhat.com; david.marchand at redhat.com
> Cc: Maxime Coquelin <maxime.coquelin at redhat.com>
> Subject: [PATCH 29/40] net/virtio: add Virtio-user vring file ops
> 
> This patch introduces new callbacks for setting
> vring files (kick and call).
> 
> Signed-off-by: Maxime Coquelin <maxime.coquelin at redhat.com>
> ---
>  drivers/net/virtio/virtio_user/vhost.h        |  2 +
>  drivers/net/virtio/virtio_user/vhost_kernel.c | 41 +++++++++++++++--
>  drivers/net/virtio/virtio_user/vhost_user.c   | 46 +++++++++++++++++--
>  drivers/net/virtio/virtio_user/vhost_vdpa.c   | 18 ++++++--
>  .../net/virtio/virtio_user/virtio_user_dev.c  |  4 +-
>  5 files changed, 97 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/net/virtio/virtio_user/vhost.h
> b/drivers/net/virtio/virtio_user/vhost.h
> index 1385c1563b..b296ee215d 100644
> --- a/drivers/net/virtio/virtio_user/vhost.h
> +++ b/drivers/net/virtio/virtio_user/vhost.h
> @@ -111,6 +111,8 @@ struct virtio_user_backend_ops {
>  	int (*set_vring_num)(struct virtio_user_dev *dev, struct
> vhost_vring_state *state);
>  	int (*set_vring_base)(struct virtio_user_dev *dev, struct
> vhost_vring_state *state);
>  	int (*get_vring_base)(struct virtio_user_dev *dev, struct
> vhost_vring_state *state);
> +	int (*set_vring_call)(struct virtio_user_dev *dev, struct
> vhost_vring_file *file);
> +	int (*set_vring_kick)(struct virtio_user_dev *dev, struct
> vhost_vring_file *file);
>  	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 2f1b4840ee..1805aee7f7 100644
> --- a/drivers/net/virtio/virtio_user/vhost_kernel.c
> +++ b/drivers/net/virtio/virtio_user/vhost_kernel.c
> @@ -259,11 +259,44 @@ vhost_kernel_get_vring_base(struct virtio_user_dev *dev,
> struct vhost_vring_stat
>  	return vhost_kernel_set_vring(dev, VHOST_GET_VRING_BASE, state);
>  }
> 
> +static int
> +vhost_kernel_set_vring_file(struct virtio_user_dev *dev, uint64_t req,
> +		struct vhost_vring_file *file)
> +{
> +	int ret, fd;
> +	uint32_t index = file->index;

Better use 'unsigned int index' here? It can hardly cause problem but I think it's
better to use the type in struct vhost_vring_file.

> +
> +	/* Convert from queue index to queue-pair & offset */
> +	fd = dev->vhostfds[file->index / 2];
> +	file->index %= 2;
> +
> +	ret = vhost_kernel_ioctl(fd, req, file);
> +	if (ret < 0) {
> +		PMD_DRV_LOG(ERR, "Failed to set vring file (request %lu)", req);

Seems David has also noticed: better use PRIu64 here instead of %lu ?

Thanks,
Chenbo

> +		return -1;
> +	}
> +
> +	/* restore index back to queue index */
> +	file->index = index;
> +
> +	return 0;
> +}
> +
> +static int
> +vhost_kernel_set_vring_kick(struct virtio_user_dev *dev, struct
> vhost_vring_file *file)
> +{
> +	return vhost_kernel_set_vring_file(dev, VHOST_SET_VRING_CALL, file);
> +}
> +
> +static int
> +vhost_kernel_set_vring_call(struct virtio_user_dev *dev, struct
> vhost_vring_file *file)
> +{
> +	return vhost_kernel_set_vring_file(dev, VHOST_SET_VRING_KICK, file);
> +}
> +
>  static uint64_t vhost_req_user_to_kernel[] = {
>  	[VHOST_USER_RESET_OWNER] = VHOST_RESET_OWNER,
> -	[VHOST_USER_SET_VRING_CALL] = VHOST_SET_VRING_CALL,
>  	[VHOST_USER_SET_VRING_ADDR] = VHOST_SET_VRING_ADDR,
> -	[VHOST_USER_SET_VRING_KICK] = VHOST_SET_VRING_KICK,
>  };
> 
>  static int
> @@ -283,8 +316,6 @@ vhost_kernel_send_request(struct virtio_user_dev *dev,
> 
>  	switch (req_kernel) {
>  	case VHOST_SET_VRING_ADDR:
> -	case VHOST_SET_VRING_KICK:
> -	case VHOST_SET_VRING_CALL:
>  		queue_sel = *(unsigned int *)arg;
>  		vhostfd = dev->vhostfds[queue_sel / 2];
>  		*(unsigned int *)arg = queue_sel % 2;
> @@ -440,6 +471,8 @@ struct virtio_user_backend_ops virtio_ops_kernel = {
>  	.set_vring_num = vhost_kernel_set_vring_num,
>  	.set_vring_base = vhost_kernel_set_vring_base,
>  	.get_vring_base = vhost_kernel_get_vring_base,
> +	.set_vring_call = vhost_kernel_set_vring_call,
> +	.set_vring_kick = vhost_kernel_set_vring_kick,
>  	.send_request = vhost_kernel_send_request,
>  	.enable_qp = vhost_kernel_enable_queue_pair
>  };
> diff --git a/drivers/net/virtio/virtio_user/vhost_user.c
> b/drivers/net/virtio/virtio_user/vhost_user.c
> index 50a587fab4..509a96dfbc 100644
> --- a/drivers/net/virtio/virtio_user/vhost_user.c
> +++ b/drivers/net/virtio/virtio_user/vhost_user.c
> @@ -483,13 +483,51 @@ vhost_user_get_vring_base(struct virtio_user_dev *dev,
> struct vhost_vring_state
>  	return -1;
>  }
> 
> +static int
> +vhost_user_set_vring_file(struct virtio_user_dev *dev, enum
> vhost_user_request req,
> +		struct vhost_vring_file *file)
> +{
> +	int ret;
> +	int fd = file->fd;
> +	int num_fd = 0;
> +	struct vhost_user_msg msg = {
> +		.request = req,
> +		.flags = VHOST_USER_VERSION,
> +		.size = sizeof(msg.payload.u64),
> +		.payload.u64 = file->index & VHOST_USER_VRING_IDX_MASK,
> +	};
> +
> +	if (fd >= 0)
> +		num_fd++;
> +	else
> +		msg.payload.u64 |= VHOST_USER_VRING_NOFD_MASK;
> +
> +	ret = vhost_user_write(dev->vhostfd, &msg, &fd, num_fd);
> +	if (ret < 0) {
> +		PMD_DRV_LOG(ERR, "Failed to set vring file (request %d)", req);
> +		return -1;
> +	}
> +
> +	return 0;
> +}
> +
> +static int
> +vhost_user_set_vring_call(struct virtio_user_dev *dev, struct
> vhost_vring_file *file)
> +{
> +	return vhost_user_set_vring_file(dev, VHOST_USER_SET_VRING_CALL, file);
> +}
> +
> +static int
> +vhost_user_set_vring_kick(struct virtio_user_dev *dev, struct
> vhost_vring_file *file)
> +{
> +	return vhost_user_set_vring_file(dev, VHOST_USER_SET_VRING_KICK, file);
> +}
> +
>  static struct vhost_user_msg m;
> 
>  const char * const vhost_msg_strings[] = {
>  	[VHOST_USER_RESET_OWNER] = "VHOST_RESET_OWNER",
> -	[VHOST_USER_SET_VRING_CALL] = "VHOST_SET_VRING_CALL",
>  	[VHOST_USER_SET_VRING_ADDR] = "VHOST_SET_VRING_ADDR",
> -	[VHOST_USER_SET_VRING_KICK] = "VHOST_SET_VRING_KICK",
>  	[VHOST_USER_SET_STATUS] = "VHOST_SET_STATUS",
>  	[VHOST_USER_GET_STATUS] = "VHOST_GET_STATUS",
>  };
> @@ -556,8 +594,6 @@ vhost_user_sock(struct virtio_user_dev *dev,
>  		msg.size = sizeof(m.payload.addr);
>  		break;
> 
> -	case VHOST_USER_SET_VRING_KICK:
> -	case VHOST_USER_SET_VRING_CALL:
>  	case VHOST_USER_SET_VRING_ERR:
>  		file = arg;
>  		msg.payload.u64 = file->index & VHOST_USER_VRING_IDX_MASK;
> @@ -729,6 +765,8 @@ struct virtio_user_backend_ops virtio_ops_user = {
>  	.set_vring_num = vhost_user_set_vring_num,
>  	.set_vring_base = vhost_user_set_vring_base,
>  	.get_vring_base = vhost_user_get_vring_base,
> +	.set_vring_call = vhost_user_set_vring_call,
> +	.set_vring_kick = vhost_user_set_vring_kick,
>  	.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 c1b790ddc6..48fe3f23e8 100644
> --- a/drivers/net/virtio/virtio_user/vhost_vdpa.c
> +++ b/drivers/net/virtio/virtio_user/vhost_vdpa.c
> @@ -36,9 +36,7 @@
> 
>  static uint64_t vhost_req_user_to_vdpa[] = {
>  	[VHOST_USER_RESET_OWNER] = VHOST_RESET_OWNER,
> -	[VHOST_USER_SET_VRING_CALL] = VHOST_SET_VRING_CALL,
>  	[VHOST_USER_SET_VRING_ADDR] = VHOST_SET_VRING_ADDR,
> -	[VHOST_USER_SET_VRING_KICK] = VHOST_SET_VRING_KICK,
>  	[VHOST_USER_SET_STATUS] = VHOST_VDPA_SET_STATUS,
>  	[VHOST_USER_GET_STATUS] = VHOST_VDPA_GET_STATUS,
>  };
> @@ -238,6 +236,18 @@ vhost_vdpa_get_vring_base(struct virtio_user_dev *dev,
> struct vhost_vring_state
>  	return vhost_vdpa_ioctl(dev->vhostfd, VHOST_GET_VRING_BASE, state);
>  }
> 
> +static int
> +vhost_vdpa_set_vring_call(struct virtio_user_dev *dev, struct
> vhost_vring_file *file)
> +{
> +	return vhost_vdpa_ioctl(dev->vhostfd, VHOST_SET_VRING_CALL, file);
> +}
> +
> +static int
> +vhost_vdpa_set_vring_kick(struct virtio_user_dev *dev, struct
> vhost_vring_file *file)
> +{
> +	return vhost_vdpa_ioctl(dev->vhostfd, VHOST_SET_VRING_KICK, file);
> +}
> +
>  /* with below features, vhost vdpa does not need to do the checksum and TSO,
>   * these info will be passed to virtio_user through virtio net header.
>   */
> @@ -267,8 +277,6 @@ vhost_vdpa_send_request(struct virtio_user_dev *dev,
> 
>  	switch (req_vdpa) {
>  	case VHOST_SET_VRING_ADDR:
> -	case VHOST_SET_VRING_KICK:
> -	case VHOST_SET_VRING_CALL:
>  		PMD_DRV_LOG(DEBUG, "vhostfd=%d, index=%u",
>  			    dev->vhostfd, *(unsigned int *)arg);
>  		break;
> @@ -347,6 +355,8 @@ struct virtio_user_backend_ops virtio_ops_vdpa = {
>  	.set_vring_num = vhost_vdpa_set_vring_num,
>  	.set_vring_base = vhost_vdpa_set_vring_base,
>  	.get_vring_base = vhost_vdpa_get_vring_base,
> +	.set_vring_call = vhost_vdpa_set_vring_call,
> +	.set_vring_kick = vhost_vdpa_set_vring_kick,
>  	.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 496a48ee51..e4975838ea 100644
> --- a/drivers/net/virtio/virtio_user/virtio_user_dev.c
> +++ b/drivers/net/virtio/virtio_user/virtio_user_dev.c
> @@ -40,7 +40,7 @@ virtio_user_create_queue(struct virtio_user_dev *dev,
> uint32_t queue_sel)
> 
>  	file.index = queue_sel;
>  	file.fd = dev->callfds[queue_sel];
> -	dev->ops->send_request(dev, VHOST_USER_SET_VRING_CALL, &file);
> +	dev->ops->set_vring_call(dev, &file);
> 
>  	return 0;
>  }
> @@ -89,7 +89,7 @@ virtio_user_kick_queue(struct virtio_user_dev *dev, uint32_t
> queue_sel)
>  	 */
>  	file.index = queue_sel;
>  	file.fd = dev->kickfds[queue_sel];
> -	dev->ops->send_request(dev, VHOST_USER_SET_VRING_KICK, &file);
> +	dev->ops->set_vring_kick(dev, &file);
> 
>  	return 0;
>  }
> --
> 2.29.2