[PATCH v2 2/2] vhost: fix vduse features negotiation

[Xia, Chenbo]

> -----Original Message-----
> From: Maxime Coquelin <maxime.coquelin at redhat.com>
> Sent: Thursday, July 6, 2023 4:12 PM
> To: dev at dpdk.org; Xia, Chenbo <chenbo.xia at intel.com>;
> david.marchand at redhat.com
> Cc: Maxime Coquelin <maxime.coquelin at redhat.com>
> Subject: [PATCH v2 2/2] vhost: fix vduse features negotiation
> 
> The series introducing VDUSE support missed the
> application capability to disable supported features.
> 
> This results in TSO being negotiated while not supported by
> the application.
> 
> Fixes: 0adb8eccc6a6 ("vhost: add VDUSE device creation and destruction")
> 
> Signed-off-by: Maxime Coquelin <maxime.coquelin at redhat.com>
> ---
>  lib/vhost/socket.c     | 19 +++++++++++++------
>  lib/vhost/vduse.c      | 29 +++++++----------------------
>  lib/vhost/vduse.h      |  2 ++
>  lib/vhost/vhost.h      |  8 +-------
>  lib/vhost/vhost_user.h |  9 +++++++++
>  5 files changed, 32 insertions(+), 35 deletions(-)
> 
> diff --git a/lib/vhost/socket.c b/lib/vhost/socket.c
> index 19a7469e45..f55fb299fd 100644
> --- a/lib/vhost/socket.c
> +++ b/lib/vhost/socket.c
> @@ -921,6 +921,10 @@ rte_vhost_driver_register(const char *path, uint64_t
> flags)
>  		VHOST_LOG_CONFIG(path, ERR, "failed to init connection
> mutex\n");
>  		goto out_free;
>  	}
> +
> +	if (!strncmp("/dev/vduse/", path, strlen("/dev/vduse/")))
> +		vsocket->is_vduse = true;
> +
>  	vsocket->vdpa_dev = NULL;
>  	vsocket->max_queue_pairs = VHOST_MAX_QUEUE_PAIRS;
>  	vsocket->extbuf = flags & RTE_VHOST_USER_EXTBUF_SUPPORT;
> @@ -950,9 +954,14 @@ rte_vhost_driver_register(const char *path, uint64_t
> flags)
>  	 * two values.
>  	 */
>  	vsocket->use_builtin_virtio_net = true;
> -	vsocket->supported_features = VIRTIO_NET_SUPPORTED_FEATURES;
> -	vsocket->features           = VIRTIO_NET_SUPPORTED_FEATURES;
> -	vsocket->protocol_features  = VHOST_USER_PROTOCOL_FEATURES;
> +	if (vsocket->is_vduse) {
> +		vsocket->supported_features = VDUSE_NET_SUPPORTED_FEATURES;
> +		vsocket->features           = VDUSE_NET_SUPPORTED_FEATURES;
> +	} else {
> +		vsocket->supported_features =
> VHOST_USER_NET_SUPPORTED_FEATURES;
> +		vsocket->features           =
> VHOST_USER_NET_SUPPORTED_FEATURES;
> +		vsocket->protocol_features  = VHOST_USER_PROTOCOL_FEATURES;
> +	}
> 
>  	if (vsocket->async_copy) {
>  		vsocket->supported_features &= ~(1ULL << VHOST_F_LOG_ALL);
> @@ -993,9 +1002,7 @@ rte_vhost_driver_register(const char *path, uint64_t
> flags)
>  #endif
>  	}
> 
> -	if (!strncmp("/dev/vduse/", path, strlen("/dev/vduse/"))) {
> -		vsocket->is_vduse = true;
> -	} else {
> +	if (!vsocket->is_vduse) {
>  		if ((flags & RTE_VHOST_USER_CLIENT) != 0) {
>  			vsocket->reconnect = !(flags &
> RTE_VHOST_USER_NO_RECONNECT);
>  			if (vsocket->reconnect && reconn_tid == 0) {
> diff --git a/lib/vhost/vduse.c b/lib/vhost/vduse.c
> index b9514e6c29..1478562be1 100644
> --- a/lib/vhost/vduse.c
> +++ b/lib/vhost/vduse.c
> @@ -26,27 +26,6 @@
>  #define VHOST_VDUSE_API_VERSION 0
>  #define VDUSE_CTRL_PATH "/dev/vduse/control"
> 
> -#define VDUSE_NET_SUPPORTED_FEATURES ((1ULL << VIRTIO_NET_F_MRG_RXBUF) |
> \
> -				(1ULL << VIRTIO_F_ANY_LAYOUT) | \
> -				(1ULL << VIRTIO_F_VERSION_1)   | \
> -				(1ULL << VIRTIO_NET_F_GSO) | \
> -				(1ULL << VIRTIO_NET_F_HOST_TSO4) | \
> -				(1ULL << VIRTIO_NET_F_HOST_TSO6) | \
> -				(1ULL << VIRTIO_NET_F_HOST_UFO) | \
> -				(1ULL << VIRTIO_NET_F_HOST_ECN) | \
> -				(1ULL << VIRTIO_NET_F_CSUM)    | \
> -				(1ULL << VIRTIO_NET_F_GUEST_CSUM) | \
> -				(1ULL << VIRTIO_NET_F_GUEST_TSO4) | \
> -				(1ULL << VIRTIO_NET_F_GUEST_TSO6) | \
> -				(1ULL << VIRTIO_NET_F_GUEST_UFO) | \
> -				(1ULL << VIRTIO_NET_F_GUEST_ECN) | \
> -				(1ULL << VIRTIO_RING_F_INDIRECT_DESC) | \
> -				(1ULL << VIRTIO_RING_F_EVENT_IDX) | \
> -				(1ULL << VIRTIO_F_IN_ORDER) | \
> -				(1ULL << VIRTIO_F_IOMMU_PLATFORM) | \
> -				(1ULL << VIRTIO_NET_F_CTRL_VQ) | \
> -				(1ULL << VIRTIO_NET_F_MQ))
> -
>  struct vduse {
>  	struct fdset fdset;
>  };
> @@ -441,7 +420,7 @@ vduse_device_create(const char *path)
>  	struct virtio_net *dev;
>  	struct virtio_net_config vnet_config = { 0 };
>  	uint64_t ver = VHOST_VDUSE_API_VERSION;
> -	uint64_t features = VDUSE_NET_SUPPORTED_FEATURES;
> +	uint64_t features;
>  	struct vduse_dev_config *dev_config = NULL;
>  	const char *name = path + strlen("/dev/vduse/");
> 
> @@ -489,6 +468,12 @@ vduse_device_create(const char *path)
>  		goto out_ctrl_close;
>  	}
> 
> +	ret = rte_vhost_driver_get_features(path, &features);
> +	if (ret < 0) {
> +		VHOST_LOG_CONFIG(name, ERR, "Failed to get backend
> features\n");
> +		goto out_free;
> +	}
> +
>  	ret = rte_vhost_driver_get_queue_num(path, &max_queue_pairs);
>  	if (ret < 0) {
>  		VHOST_LOG_CONFIG(name, ERR, "Failed to get max queue pairs\n");
> diff --git a/lib/vhost/vduse.h b/lib/vhost/vduse.h
> index a15e5d4c16..d0142694a7 100644
> --- a/lib/vhost/vduse.h
> +++ b/lib/vhost/vduse.h
> @@ -7,6 +7,8 @@
> 
>  #include "vhost.h"
> 
> +#define VDUSE_NET_SUPPORTED_FEATURES VIRTIO_NET_SUPPORTED_FEATURES
> +
>  #ifdef VHOST_HAS_VDUSE
> 
>  int vduse_device_create(const char *path);
> diff --git a/lib/vhost/vhost.h b/lib/vhost/vhost.h
> index 9ecede0f30..f49ce943b0 100644
> --- a/lib/vhost/vhost.h
> +++ b/lib/vhost/vhost.h
> @@ -438,12 +438,8 @@ struct vring_packed_desc_event {
>  #define VIRTIO_NET_SUPPORTED_FEATURES ((1ULL << VIRTIO_NET_F_MRG_RXBUF) |
> \
>  				(1ULL << VIRTIO_F_ANY_LAYOUT) | \
>  				(1ULL << VIRTIO_NET_F_CTRL_VQ) | \
> -				(1ULL << VIRTIO_NET_F_CTRL_RX) | \
> -				(1ULL << VIRTIO_NET_F_GUEST_ANNOUNCE) | \
>  				(1ULL << VIRTIO_NET_F_MQ)      | \
>  				(1ULL << VIRTIO_F_VERSION_1)   | \
> -				(1ULL << VHOST_F_LOG_ALL)      | \
> -				(1ULL << VHOST_USER_F_PROTOCOL_FEATURES) | \
>  				(1ULL << VIRTIO_NET_F_GSO) | \
>  				(1ULL << VIRTIO_NET_F_HOST_TSO4) | \
>  				(1ULL << VIRTIO_NET_F_HOST_TSO6) | \
> @@ -457,10 +453,8 @@ struct vring_packed_desc_event {
>  				(1ULL << VIRTIO_NET_F_GUEST_ECN) | \
>  				(1ULL << VIRTIO_RING_F_INDIRECT_DESC) | \
>  				(1ULL << VIRTIO_RING_F_EVENT_IDX) | \
> -				(1ULL << VIRTIO_NET_F_MTU)  | \
>  				(1ULL << VIRTIO_F_IN_ORDER) | \
> -				(1ULL << VIRTIO_F_IOMMU_PLATFORM) | \
> -				(1ULL << VIRTIO_F_RING_PACKED))
> +				(1ULL << VIRTIO_F_IOMMU_PLATFORM))
> 
> 
>  struct guest_page {
> diff --git a/lib/vhost/vhost_user.h b/lib/vhost/vhost_user.h
> index 1ffeca92f3..edf7adb3c0 100644
> --- a/lib/vhost/vhost_user.h
> +++ b/lib/vhost/vhost_user.h
> @@ -13,6 +13,15 @@
> 
>  #define VHOST_MEMORY_MAX_NREGIONS 8
> 
> +#define VHOST_USER_NET_SUPPORTED_FEATURES \
> +	(VIRTIO_NET_SUPPORTED_FEATURES | \
> +	 (1ULL << VIRTIO_F_RING_PACKED) | \
> +	 (1ULL << VIRTIO_NET_F_MTU) | \
> +	 (1ULL << VHOST_F_LOG_ALL) | \
> +	 (1ULL << VHOST_USER_F_PROTOCOL_FEATURES) | \
> +	 (1ULL << VIRTIO_NET_F_CTRL_RX) | \
> +	 (1ULL << VIRTIO_NET_F_GUEST_ANNOUNCE))
> +
>  #define VHOST_USER_PROTOCOL_FEATURES	((1ULL <<
> VHOST_USER_PROTOCOL_F_MQ) | \
>  					 (1ULL << VHOST_USER_PROTOCOL_F_LOG_SHMFD)
> |\
>  					 (1ULL << VHOST_USER_PROTOCOL_F_RARP) | \
> --
> 2.41.0

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