From: Super User <[email protected]> Add support for the VDUSE_F_QUEUE_READY feature.
In VDUSE, the dataplane is enabled only after control virtqueue so the device is fully configured in the destination of a live migration before the dataplane starts. This message signals the VDUSE device when the dataplane queues should be enabled. Signed-off-by: Eugenio Pérez <[email protected]> --- v2: * Following latest comments on kernel series about VDUSE features, not checking API version but only check if VDUSE_GET_FEATURES success. --- lib/vhost/vduse.c | 72 +++++++++++++++++++++++++++++++++++++++++++++-- lib/vhost/vhost.h | 1 + 2 files changed, 71 insertions(+), 2 deletions(-) diff --git a/lib/vhost/vduse.c b/lib/vhost/vduse.c index 54fe6cf35bc6..f62cc3189076 100644 --- a/lib/vhost/vduse.c +++ b/lib/vhost/vduse.c @@ -39,12 +39,15 @@ static const char * const vduse_reqs_str[] = { "VDUSE_SET_STATUS", "VDUSE_UPDATE_IOTLB", "VDUSE_SET_VQ_GROUP_ASID", + "VDUSE_SET_VQ_READY", }; #define vduse_req_id_to_str(id) \ (id < RTE_DIM(vduse_reqs_str) ? \ vduse_reqs_str[id] : "Unknown") +static const uint64_t supported_vduse_features = RTE_BIT64(VDUSE_F_QUEUE_READY); + static uint64_t vduse_vq_to_group(struct virtio_net *dev, struct vhost_virtqueue *vq) { if (dev->vduse_api_ver < 1) @@ -500,6 +503,46 @@ vduse_events_handler(int fd, void *arg, int *close __rte_unused) } resp.result = VDUSE_REQ_RESULT_OK; break; + case VDUSE_SET_VQ_READY: + if (!(dev->status & VIRTIO_DEVICE_STATUS_DRIVER_OK)) { + /* + * dev->notify_ops is NULL if !S_DRIVER_OK, + * vduse_device_start will check the queue readiness. + */ + resp.result = VDUSE_REQ_RESULT_OK; + break; + } + if (!(dev->vduse_features & RTE_BIT64(VDUSE_F_QUEUE_READY))) { + VHOST_CONFIG_LOG(dev->ifname, ERR, + "Unexpected ready message with feature %d", + !!(dev->vduse_features & + RTE_BIT64(VDUSE_F_QUEUE_READY))); + resp.result = VDUSE_REQ_RESULT_FAILED; + break; + } + + i = req.vq_ready.num; + vq = dev->virtqueue[i]; + if (!dev->notify_ops || !dev->notify_ops->vring_state_changed) { + VHOST_CONFIG_LOG(dev->ifname, ERR, + "No ops->vring_state_changed"); + resp.result = VDUSE_REQ_RESULT_FAILED; + break; + } + + ret = dev->notify_ops->vring_state_changed(dev->vid, i, + req.vq_ready.ready); + VHOST_CONFIG_LOG(dev->ifname, INFO, + "\t\t VQ %d gets ready %d ok %d", i, + req.vq_ready.ready, ret); + if (ret != 0) { + resp.result = VDUSE_REQ_RESULT_FAILED; + break; + } + + vq->enabled = req.vq_ready.ready; + resp.result = VDUSE_REQ_RESULT_OK; + break; default: resp.result = VDUSE_REQ_RESULT_FAILED; break; @@ -517,7 +560,8 @@ vduse_events_handler(int fd, void *arg, int *close __rte_unused) if ((old_status ^ dev->status) & VIRTIO_DEVICE_STATUS_DRIVER_OK) { if (dev->status & VIRTIO_DEVICE_STATUS_DRIVER_OK) { /* Poll virtqueues ready states before starting device */ - ret = vduse_wait_for_virtqueues_ready(dev); + ret = dev->vduse_features & RTE_BIT64(VDUSE_F_QUEUE_READY) ? 0 + : vduse_wait_for_virtqueues_ready(dev); if (ret < 0) { VHOST_CONFIG_LOG(dev->ifname, ERR, "Failed to wait for virtqueues ready, aborting device start"); @@ -723,6 +767,26 @@ vduse_reconnect_start_device(struct virtio_net *dev) return ret; } +/* If some error occurs just continue as if the kernel exposed no features */ +static uint64_t +vduse_device_get_vduse_features(int control_fd, const char *log_name) +{ + uint64_t vduse_kernel_features; + int ret; + + ret = ioctl(control_fd, VDUSE_GET_FEATURES, &vduse_kernel_features); + if (ret < 0) { + VHOST_CONFIG_LOG(log_name, INFO, + "Failed to get kernel VDUSE features, assuming not supported: %d(%s)", + errno, strerror(errno)); + return 0; + } + + VHOST_CONFIG_LOG(log_name, DEBUG, "Setting vhost kernel features: %lx", + vduse_kernel_features & supported_vduse_features); + return vduse_kernel_features & supported_vduse_features; +} + int vduse_device_create(const char *path, bool compliant_ol_flags, bool extbuf, bool linearbuf) { @@ -731,7 +795,7 @@ vduse_device_create(const char *path, bool compliant_ol_flags, bool extbuf, bool struct virtio_net *dev; struct virtio_net_config vnet_config = {{ 0 }}; uint64_t ver; - uint64_t features; + uint64_t features, vduse_features = 0; const char *name = path + strlen("/dev/vduse/"); bool reconnect = false; @@ -815,6 +879,9 @@ vduse_device_create(const char *path, bool compliant_ol_flags, bool extbuf, bool dev_config->ngroups = 2; dev_config->nas = 2; } + + vduse_features = vduse_device_get_vduse_features(control_fd, name); + dev_config->vduse_features = vduse_features; dev_config->config_size = sizeof(struct virtio_net_config); memcpy(dev_config->config, &vnet_config, sizeof(vnet_config)); @@ -865,6 +932,7 @@ vduse_device_create(const char *path, bool compliant_ol_flags, bool extbuf, bool dev->vduse_ctrl_fd = control_fd; dev->vduse_dev_fd = dev_fd; dev->vduse_api_ver = ver; + dev->vduse_features = vduse_features; ret = vduse_reconnect_log_map(dev, !reconnect); if (ret < 0) diff --git a/lib/vhost/vhost.h b/lib/vhost/vhost.h index 50b09da5ecf7..ce2e1a271c6f 100644 --- a/lib/vhost/vhost.h +++ b/lib/vhost/vhost.h @@ -533,6 +533,7 @@ struct __rte_cache_aligned virtio_net { int vduse_ctrl_fd; int vduse_dev_fd; uint64_t vduse_api_ver; + uint64_t vduse_features; struct vhost_virtqueue *cvq; -- 2.53.0
