| Message ID | 20210930153037.1194279-10-vgoyal@redhat.com |
|---|---|
| State | New |
| Headers | show |
| Series | virtiofsd: Support notification queue and | expand |
On Thu, Sep 30, 2021 at 11:30:33AM -0400, Vivek Goyal wrote: > Daemon specifies size of notification buffer needed and that should be > done using config space. > > Only ->notify_buf_size value of config space comes from daemon. Rest of > it is filled by qemu device emulation code. > > Signed-off-by: Vivek Goyal <vgoyal@redhat.com> > Signed-off-by: Ioannis Angelakopoulos <iangelak@redhat.com> > --- > hw/virtio/vhost-user-fs.c | 27 +++++++++++++++++++ > include/hw/virtio/vhost-user-fs.h | 2 ++ > include/standard-headers/linux/virtio_fs.h | 2 ++ > tools/virtiofsd/fuse_virtio.c | 31 ++++++++++++++++++++++ > 4 files changed, 62 insertions(+) > > diff --git a/hw/virtio/vhost-user-fs.c b/hw/virtio/vhost-user-fs.c > index 6bafcf0243..68a94708b4 100644 > --- a/hw/virtio/vhost-user-fs.c > +++ b/hw/virtio/vhost-user-fs.c > @@ -36,15 +36,41 @@ static const int user_feature_bits[] = { > VHOST_INVALID_FEATURE_BIT > }; > > +static int vhost_user_fs_handle_config_change(struct vhost_dev *dev) > +{ > + return 0; > +} > + > +const VhostDevConfigOps fs_ops = { > + .vhost_dev_config_notifier = vhost_user_fs_handle_config_change, > +}; > + > static void vuf_get_config(VirtIODevice *vdev, uint8_t *config) > { > VHostUserFS *fs = VHOST_USER_FS(vdev); > struct virtio_fs_config fscfg = {}; > + Error *local_err = NULL; > + int ret; > + > + /* > + * As of now we only get notification buffer size from device. And that's > + * needed only if notification queue is enabled. > + */ > + if (fs->notify_enabled) { > + ret = vhost_dev_get_config(&fs->vhost_dev, (uint8_t *)&fs->fscfg, > + sizeof(struct virtio_fs_config), > + &local_err); > + if (ret) { > + error_report_err(local_err); > + return; > + } > + } > > memcpy((char *)fscfg.tag, fs->conf.tag, > MIN(strlen(fs->conf.tag) + 1, sizeof(fscfg.tag))); > > virtio_stl_p(vdev, &fscfg.num_request_queues, fs->conf.num_request_queues); > + virtio_stl_p(vdev, &fscfg.notify_buf_size, fs->fscfg.notify_buf_size); > > memcpy(config, &fscfg, sizeof(fscfg)); > } > @@ -316,6 +342,7 @@ static void vuf_device_realize(DeviceState *dev, Error **errp) > sizeof(struct virtio_fs_config)); > > vuf_create_vqs(vdev, true); > + vhost_dev_set_config_notifier(&fs->vhost_dev, &fs_ops); > ret = vhost_dev_init(&fs->vhost_dev, &fs->vhost_user, > VHOST_BACKEND_TYPE_USER, 0, errp); > if (ret < 0) { > diff --git a/include/hw/virtio/vhost-user-fs.h b/include/hw/virtio/vhost-user-fs.h > index 95dc0dd402..3b114ee260 100644 > --- a/include/hw/virtio/vhost-user-fs.h > +++ b/include/hw/virtio/vhost-user-fs.h > @@ -14,6 +14,7 @@ > #ifndef _QEMU_VHOST_USER_FS_H > #define _QEMU_VHOST_USER_FS_H > > +#include "standard-headers/linux/virtio_fs.h" > #include "hw/virtio/virtio.h" > #include "hw/virtio/vhost.h" > #include "hw/virtio/vhost-user.h" > @@ -37,6 +38,7 @@ struct VHostUserFS { > struct vhost_virtqueue *vhost_vqs; > struct vhost_dev vhost_dev; > VhostUserState vhost_user; > + struct virtio_fs_config fscfg; > VirtQueue **req_vqs; > VirtQueue *hiprio_vq; > VirtQueue *notification_vq; > diff --git a/include/standard-headers/linux/virtio_fs.h b/include/standard-headers/linux/virtio_fs.h > index b7f015186e..867d18acf6 100644 > --- a/include/standard-headers/linux/virtio_fs.h > +++ b/include/standard-headers/linux/virtio_fs.h > @@ -17,6 +17,8 @@ struct virtio_fs_config { > > /* Number of request queues */ > uint32_t num_request_queues; > + /* Size of notification buffer */ > + uint32_t notify_buf_size; > } QEMU_PACKED; > > /* For the id field in virtio_pci_shm_cap */ Please put all the include/standard-headers/linux/ changes into a single commit that imports these changes from linux.git. Changes to this header shouldn't be hand-written, use scripts/update-linux-headers.sh instead. > diff --git a/tools/virtiofsd/fuse_virtio.c b/tools/virtiofsd/fuse_virtio.c > index f5b87a508a..3b720c5d4a 100644 > --- a/tools/virtiofsd/fuse_virtio.c > +++ b/tools/virtiofsd/fuse_virtio.c > @@ -856,6 +856,35 @@ static bool fv_queue_order(VuDev *dev, int qidx) > return false; > } > > +static uint64_t fv_get_protocol_features(VuDev *dev) > +{ > + return 1ull << VHOST_USER_PROTOCOL_F_CONFIG; > +} > + > +static int fv_get_config(VuDev *dev, uint8_t *config, uint32_t len) > +{ > + struct virtio_fs_config fscfg = {}; > + unsigned notify_size, roundto = 64; > + union fuse_notify_union { > + struct fuse_notify_poll_wakeup_out wakeup_out; > + struct fuse_notify_inval_inode_out inode_out; > + struct fuse_notify_inval_entry_out entry_out; > + struct fuse_notify_delete_out delete_out; > + struct fuse_notify_store_out store_out; > + struct fuse_notify_retrieve_out retrieve_out; > + }; > + > + notify_size = sizeof(struct fuse_out_header) + > + sizeof(union fuse_notify_union); > + notify_size = ((notify_size + roundto) / roundto) * roundto; Why is the size rounded to 64 bytes?
On Mon, Oct 04, 2021 at 03:33:47PM +0100, Stefan Hajnoczi wrote: > On Thu, Sep 30, 2021 at 11:30:33AM -0400, Vivek Goyal wrote: > > Daemon specifies size of notification buffer needed and that should be > > done using config space. > > > > Only ->notify_buf_size value of config space comes from daemon. Rest of > > it is filled by qemu device emulation code. > > > > Signed-off-by: Vivek Goyal <vgoyal@redhat.com> > > Signed-off-by: Ioannis Angelakopoulos <iangelak@redhat.com> > > --- > > hw/virtio/vhost-user-fs.c | 27 +++++++++++++++++++ > > include/hw/virtio/vhost-user-fs.h | 2 ++ > > include/standard-headers/linux/virtio_fs.h | 2 ++ > > tools/virtiofsd/fuse_virtio.c | 31 ++++++++++++++++++++++ > > 4 files changed, 62 insertions(+) > > > > diff --git a/hw/virtio/vhost-user-fs.c b/hw/virtio/vhost-user-fs.c > > index 6bafcf0243..68a94708b4 100644 > > --- a/hw/virtio/vhost-user-fs.c > > +++ b/hw/virtio/vhost-user-fs.c > > @@ -36,15 +36,41 @@ static const int user_feature_bits[] = { > > VHOST_INVALID_FEATURE_BIT > > }; > > > > +static int vhost_user_fs_handle_config_change(struct vhost_dev *dev) > > +{ > > + return 0; > > +} > > + > > +const VhostDevConfigOps fs_ops = { > > + .vhost_dev_config_notifier = vhost_user_fs_handle_config_change, > > +}; > > + > > static void vuf_get_config(VirtIODevice *vdev, uint8_t *config) > > { > > VHostUserFS *fs = VHOST_USER_FS(vdev); > > struct virtio_fs_config fscfg = {}; > > + Error *local_err = NULL; > > + int ret; > > + > > + /* > > + * As of now we only get notification buffer size from device. And that's > > + * needed only if notification queue is enabled. > > + */ > > + if (fs->notify_enabled) { > > + ret = vhost_dev_get_config(&fs->vhost_dev, (uint8_t *)&fs->fscfg, > > + sizeof(struct virtio_fs_config), > > + &local_err); > > + if (ret) { > > + error_report_err(local_err); > > + return; > > + } > > + } > > > > memcpy((char *)fscfg.tag, fs->conf.tag, > > MIN(strlen(fs->conf.tag) + 1, sizeof(fscfg.tag))); > > > > virtio_stl_p(vdev, &fscfg.num_request_queues, fs->conf.num_request_queues); > > + virtio_stl_p(vdev, &fscfg.notify_buf_size, fs->fscfg.notify_buf_size); > > > > memcpy(config, &fscfg, sizeof(fscfg)); > > } > > @@ -316,6 +342,7 @@ static void vuf_device_realize(DeviceState *dev, Error **errp) > > sizeof(struct virtio_fs_config)); > > > > vuf_create_vqs(vdev, true); > > + vhost_dev_set_config_notifier(&fs->vhost_dev, &fs_ops); > > ret = vhost_dev_init(&fs->vhost_dev, &fs->vhost_user, > > VHOST_BACKEND_TYPE_USER, 0, errp); > > if (ret < 0) { > > diff --git a/include/hw/virtio/vhost-user-fs.h b/include/hw/virtio/vhost-user-fs.h > > index 95dc0dd402..3b114ee260 100644 > > --- a/include/hw/virtio/vhost-user-fs.h > > +++ b/include/hw/virtio/vhost-user-fs.h > > @@ -14,6 +14,7 @@ > > #ifndef _QEMU_VHOST_USER_FS_H > > #define _QEMU_VHOST_USER_FS_H > > > > +#include "standard-headers/linux/virtio_fs.h" > > #include "hw/virtio/virtio.h" > > #include "hw/virtio/vhost.h" > > #include "hw/virtio/vhost-user.h" > > @@ -37,6 +38,7 @@ struct VHostUserFS { > > struct vhost_virtqueue *vhost_vqs; > > struct vhost_dev vhost_dev; > > VhostUserState vhost_user; > > + struct virtio_fs_config fscfg; > > VirtQueue **req_vqs; > > VirtQueue *hiprio_vq; > > VirtQueue *notification_vq; > > diff --git a/include/standard-headers/linux/virtio_fs.h b/include/standard-headers/linux/virtio_fs.h > > index b7f015186e..867d18acf6 100644 > > --- a/include/standard-headers/linux/virtio_fs.h > > +++ b/include/standard-headers/linux/virtio_fs.h > > @@ -17,6 +17,8 @@ struct virtio_fs_config { > > > > /* Number of request queues */ > > uint32_t num_request_queues; > > + /* Size of notification buffer */ > > + uint32_t notify_buf_size; > > } QEMU_PACKED; > > > > /* For the id field in virtio_pci_shm_cap */ > > Please put all the include/standard-headers/linux/ changes into a single > commit that imports these changes from linux.git. Changes to this header > shouldn't be hand-written, use scripts/update-linux-headers.sh instead. Will do. These changes are not in kernel yet. So will use update-linux-headers.sh when changes are upstreamed. But agreed, that this change should be in separate patch even for review purpose (before it is merged in kernel). > > > diff --git a/tools/virtiofsd/fuse_virtio.c b/tools/virtiofsd/fuse_virtio.c > > index f5b87a508a..3b720c5d4a 100644 > > --- a/tools/virtiofsd/fuse_virtio.c > > +++ b/tools/virtiofsd/fuse_virtio.c > > @@ -856,6 +856,35 @@ static bool fv_queue_order(VuDev *dev, int qidx) > > return false; > > } > > > > +static uint64_t fv_get_protocol_features(VuDev *dev) > > +{ > > + return 1ull << VHOST_USER_PROTOCOL_F_CONFIG; > > +} > > + > > +static int fv_get_config(VuDev *dev, uint8_t *config, uint32_t len) > > +{ > > + struct virtio_fs_config fscfg = {}; > > + unsigned notify_size, roundto = 64; > > + union fuse_notify_union { > > + struct fuse_notify_poll_wakeup_out wakeup_out; > > + struct fuse_notify_inval_inode_out inode_out; > > + struct fuse_notify_inval_entry_out entry_out; > > + struct fuse_notify_delete_out delete_out; > > + struct fuse_notify_store_out store_out; > > + struct fuse_notify_retrieve_out retrieve_out; > > + }; > > + > > + notify_size = sizeof(struct fuse_out_header) + > > + sizeof(union fuse_notify_union); > > + notify_size = ((notify_size + roundto) / roundto) * roundto; > > Why is the size rounded to 64 bytes? Hmm.., I really can't remember why did I do that. Maybe I thought it is just nice to round it to 64 bytes. I can get rid of this rounding if it s not making sense. Vivek
On 2021-09-30 at 11:30 -04, Vivek Goyal <vgoyal@redhat.com> wrote... > Daemon specifies size of notification buffer needed and that should be > done using config space. > > Only ->notify_buf_size value of config space comes from daemon. Rest of > it is filled by qemu device emulation code. > > Signed-off-by: Vivek Goyal <vgoyal@redhat.com> > Signed-off-by: Ioannis Angelakopoulos <iangelak@redhat.com> > --- > hw/virtio/vhost-user-fs.c | 27 +++++++++++++++++++ > include/hw/virtio/vhost-user-fs.h | 2 ++ > include/standard-headers/linux/virtio_fs.h | 2 ++ > tools/virtiofsd/fuse_virtio.c | 31 ++++++++++++++++++++++ > 4 files changed, 62 insertions(+) > > diff --git a/hw/virtio/vhost-user-fs.c b/hw/virtio/vhost-user-fs.c > index 6bafcf0243..68a94708b4 100644 > --- a/hw/virtio/vhost-user-fs.c > +++ b/hw/virtio/vhost-user-fs.c > @@ -36,15 +36,41 @@ static const int user_feature_bits[] = { > VHOST_INVALID_FEATURE_BIT > }; > > +static int vhost_user_fs_handle_config_change(struct vhost_dev *dev) > +{ > + return 0; > +} > + > +const VhostDevConfigOps fs_ops = { > + .vhost_dev_config_notifier = vhost_user_fs_handle_config_change, > +}; > + > static void vuf_get_config(VirtIODevice *vdev, uint8_t *config) > { > VHostUserFS *fs = VHOST_USER_FS(vdev); > struct virtio_fs_config fscfg = {}; > + Error *local_err = NULL; > + int ret; > + > + /* > + * As of now we only get notification buffer size from device. And that's > + * needed only if notification queue is enabled. > + */ > + if (fs->notify_enabled) { > + ret = vhost_dev_get_config(&fs->vhost_dev, (uint8_t *)&fs->fscfg, > + sizeof(struct virtio_fs_config), > + &local_err); > + if (ret) { > + error_report_err(local_err); > + return; > + } > + } I was a bit puzzled by this form of error reporting from the config callback. It looks like this is not a first, the same pattern exists in vhost-user-input, vhost-user-gpu, vhost-user-gpu. However, in all these other cases, there is a memset of the config data to zero before returning, so you don't leave it uninitialized. Only vhost-user-blk follows a similar pattern as the code above. Apparently, vhost_dev_get_config itself does not zero the config either. Would it be worth adding the following to the error path? memset(config, 0, sizeof(fscfg)); > > memcpy((char *)fscfg.tag, fs->conf.tag, > MIN(strlen(fs->conf.tag) + 1, sizeof(fscfg.tag))); > > virtio_stl_p(vdev, &fscfg.num_request_queues, fs->conf.num_request_queues); > + virtio_stl_p(vdev, &fscfg.notify_buf_size, fs->fscfg.notify_buf_size); > > memcpy(config, &fscfg, sizeof(fscfg)); > } > @@ -316,6 +342,7 @@ static void vuf_device_realize(DeviceState *dev, Error **errp) > sizeof(struct virtio_fs_config)); > > vuf_create_vqs(vdev, true); > + vhost_dev_set_config_notifier(&fs->vhost_dev, &fs_ops); > ret = vhost_dev_init(&fs->vhost_dev, &fs->vhost_user, > VHOST_BACKEND_TYPE_USER, 0, errp); > if (ret < 0) { > diff --git a/include/hw/virtio/vhost-user-fs.h b/include/hw/virtio/vhost-user-fs.h > index 95dc0dd402..3b114ee260 100644 > --- a/include/hw/virtio/vhost-user-fs.h > +++ b/include/hw/virtio/vhost-user-fs.h > @@ -14,6 +14,7 @@ > #ifndef _QEMU_VHOST_USER_FS_H > #define _QEMU_VHOST_USER_FS_H > > +#include "standard-headers/linux/virtio_fs.h" > #include "hw/virtio/virtio.h" > #include "hw/virtio/vhost.h" > #include "hw/virtio/vhost-user.h" > @@ -37,6 +38,7 @@ struct VHostUserFS { > struct vhost_virtqueue *vhost_vqs; > struct vhost_dev vhost_dev; > VhostUserState vhost_user; > + struct virtio_fs_config fscfg; > VirtQueue **req_vqs; > VirtQueue *hiprio_vq; > VirtQueue *notification_vq; > diff --git a/include/standard-headers/linux/virtio_fs.h b/include/standard-headers/linux/virtio_fs.h > index b7f015186e..867d18acf6 100644 > --- a/include/standard-headers/linux/virtio_fs.h > +++ b/include/standard-headers/linux/virtio_fs.h > @@ -17,6 +17,8 @@ struct virtio_fs_config { > > /* Number of request queues */ > uint32_t num_request_queues; > + /* Size of notification buffer */ > + uint32_t notify_buf_size; > } QEMU_PACKED; > > /* For the id field in virtio_pci_shm_cap */ > diff --git a/tools/virtiofsd/fuse_virtio.c b/tools/virtiofsd/fuse_virtio.c > index f5b87a508a..3b720c5d4a 100644 > --- a/tools/virtiofsd/fuse_virtio.c > +++ b/tools/virtiofsd/fuse_virtio.c > @@ -856,6 +856,35 @@ static bool fv_queue_order(VuDev *dev, int qidx) > return false; > } > > +static uint64_t fv_get_protocol_features(VuDev *dev) > +{ > + return 1ull << VHOST_USER_PROTOCOL_F_CONFIG; > +} > + > +static int fv_get_config(VuDev *dev, uint8_t *config, uint32_t len) > +{ > + struct virtio_fs_config fscfg = {}; > + unsigned notify_size, roundto = 64; > + union fuse_notify_union { > + struct fuse_notify_poll_wakeup_out wakeup_out; > + struct fuse_notify_inval_inode_out inode_out; > + struct fuse_notify_inval_entry_out entry_out; > + struct fuse_notify_delete_out delete_out; > + struct fuse_notify_store_out store_out; > + struct fuse_notify_retrieve_out retrieve_out; > + }; > + > + notify_size = sizeof(struct fuse_out_header) + > + sizeof(union fuse_notify_union); > + notify_size = ((notify_size + roundto) / roundto) * roundto; > + > + fscfg.notify_buf_size = notify_size; > + memcpy(config, &fscfg, len); > + fuse_log(FUSE_LOG_DEBUG, "%s:Setting notify_buf_size=%d\n", __func__, > + fscfg.notify_buf_size); > + return 0; > +} > + > static const VuDevIface fv_iface = { > .get_features = fv_get_features, > .set_features = fv_set_features, > @@ -864,6 +893,8 @@ static const VuDevIface fv_iface = { > .queue_set_started = fv_queue_set_started, > > .queue_is_processed_in_order = fv_queue_order, > + .get_protocol_features = fv_get_protocol_features, > + .get_config = fv_get_config, > }; > > /* -- Cheers, Christophe de Dinechin (IRC c3d)
diff --git a/hw/virtio/vhost-user-fs.c b/hw/virtio/vhost-user-fs.c index 6bafcf0243..68a94708b4 100644 --- a/hw/virtio/vhost-user-fs.c +++ b/hw/virtio/vhost-user-fs.c @@ -36,15 +36,41 @@ static const int user_feature_bits[] = { VHOST_INVALID_FEATURE_BIT }; +static int vhost_user_fs_handle_config_change(struct vhost_dev *dev) +{ + return 0; +} + +const VhostDevConfigOps fs_ops = { + .vhost_dev_config_notifier = vhost_user_fs_handle_config_change, +}; + static void vuf_get_config(VirtIODevice *vdev, uint8_t *config) { VHostUserFS *fs = VHOST_USER_FS(vdev); struct virtio_fs_config fscfg = {}; + Error *local_err = NULL; + int ret; + + /* + * As of now we only get notification buffer size from device. And that's + * needed only if notification queue is enabled. + */ + if (fs->notify_enabled) { + ret = vhost_dev_get_config(&fs->vhost_dev, (uint8_t *)&fs->fscfg, + sizeof(struct virtio_fs_config), + &local_err); + if (ret) { + error_report_err(local_err); + return; + } + } memcpy((char *)fscfg.tag, fs->conf.tag, MIN(strlen(fs->conf.tag) + 1, sizeof(fscfg.tag))); virtio_stl_p(vdev, &fscfg.num_request_queues, fs->conf.num_request_queues); + virtio_stl_p(vdev, &fscfg.notify_buf_size, fs->fscfg.notify_buf_size); memcpy(config, &fscfg, sizeof(fscfg)); } @@ -316,6 +342,7 @@ static void vuf_device_realize(DeviceState *dev, Error **errp) sizeof(struct virtio_fs_config)); vuf_create_vqs(vdev, true); + vhost_dev_set_config_notifier(&fs->vhost_dev, &fs_ops); ret = vhost_dev_init(&fs->vhost_dev, &fs->vhost_user, VHOST_BACKEND_TYPE_USER, 0, errp); if (ret < 0) { diff --git a/include/hw/virtio/vhost-user-fs.h b/include/hw/virtio/vhost-user-fs.h index 95dc0dd402..3b114ee260 100644 --- a/include/hw/virtio/vhost-user-fs.h +++ b/include/hw/virtio/vhost-user-fs.h @@ -14,6 +14,7 @@ #ifndef _QEMU_VHOST_USER_FS_H #define _QEMU_VHOST_USER_FS_H +#include "standard-headers/linux/virtio_fs.h" #include "hw/virtio/virtio.h" #include "hw/virtio/vhost.h" #include "hw/virtio/vhost-user.h" @@ -37,6 +38,7 @@ struct VHostUserFS { struct vhost_virtqueue *vhost_vqs; struct vhost_dev vhost_dev; VhostUserState vhost_user; + struct virtio_fs_config fscfg; VirtQueue **req_vqs; VirtQueue *hiprio_vq; VirtQueue *notification_vq; diff --git a/include/standard-headers/linux/virtio_fs.h b/include/standard-headers/linux/virtio_fs.h index b7f015186e..867d18acf6 100644 --- a/include/standard-headers/linux/virtio_fs.h +++ b/include/standard-headers/linux/virtio_fs.h @@ -17,6 +17,8 @@ struct virtio_fs_config { /* Number of request queues */ uint32_t num_request_queues; + /* Size of notification buffer */ + uint32_t notify_buf_size; } QEMU_PACKED; /* For the id field in virtio_pci_shm_cap */ diff --git a/tools/virtiofsd/fuse_virtio.c b/tools/virtiofsd/fuse_virtio.c index f5b87a508a..3b720c5d4a 100644 --- a/tools/virtiofsd/fuse_virtio.c +++ b/tools/virtiofsd/fuse_virtio.c @@ -856,6 +856,35 @@ static bool fv_queue_order(VuDev *dev, int qidx) return false; } +static uint64_t fv_get_protocol_features(VuDev *dev) +{ + return 1ull << VHOST_USER_PROTOCOL_F_CONFIG; +} + +static int fv_get_config(VuDev *dev, uint8_t *config, uint32_t len) +{ + struct virtio_fs_config fscfg = {}; + unsigned notify_size, roundto = 64; + union fuse_notify_union { + struct fuse_notify_poll_wakeup_out wakeup_out; + struct fuse_notify_inval_inode_out inode_out; + struct fuse_notify_inval_entry_out entry_out; + struct fuse_notify_delete_out delete_out; + struct fuse_notify_store_out store_out; + struct fuse_notify_retrieve_out retrieve_out; + }; + + notify_size = sizeof(struct fuse_out_header) + + sizeof(union fuse_notify_union); + notify_size = ((notify_size + roundto) / roundto) * roundto; + + fscfg.notify_buf_size = notify_size; + memcpy(config, &fscfg, len); + fuse_log(FUSE_LOG_DEBUG, "%s:Setting notify_buf_size=%d\n", __func__, + fscfg.notify_buf_size); + return 0; +} + static const VuDevIface fv_iface = { .get_features = fv_get_features, .set_features = fv_set_features, @@ -864,6 +893,8 @@ static const VuDevIface fv_iface = { .queue_set_started = fv_queue_set_started, .queue_is_processed_in_order = fv_queue_order, + .get_protocol_features = fv_get_protocol_features, + .get_config = fv_get_config, }; /*