From: Zhihong Wang Date: Mon, 2 Apr 2018 11:46:54 +0000 (+0800) Subject: vhost: add APIs for datapath configuration X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=b4953225cea4;p=dpdk.git vhost: add APIs for datapath configuration This patch adds APIs for datapath configuration. The did of the vhost-user socket can be set to identify the backend device, in this case each vhost-user socket can have only 1 connection. The did is set to -1 by default when the software datapath is used. Signed-off-by: Zhihong Wang Reviewed-by: Maxime Coquelin --- diff --git a/lib/librte_vhost/rte_vhost.h b/lib/librte_vhost/rte_vhost.h index 671ea50531..8f35167f20 100644 --- a/lib/librte_vhost/rte_vhost.h +++ b/lib/librte_vhost/rte_vhost.h @@ -199,6 +199,41 @@ int rte_vhost_driver_register(const char *path, uint64_t flags); /* Unregister vhost driver. This is only meaningful to vhost user. */ int rte_vhost_driver_unregister(const char *path); +/** + * Set the vdpa device id, enforce single connection per socket + * + * @param path + * The vhost-user socket file path + * @param did + * Device id + * @return + * 0 on success, -1 on failure + */ +int __rte_experimental +rte_vhost_driver_attach_vdpa_device(const char *path, int did); + +/** + * Unset the vdpa device id + * + * @param path + * The vhost-user socket file path + * @return + * 0 on success, -1 on failure + */ +int __rte_experimental +rte_vhost_driver_detach_vdpa_device(const char *path); + +/** + * Get the device id + * + * @param path + * The vhost-user socket file path + * @return + * Device id, -1 on failure + */ +int __rte_experimental +rte_vhost_driver_get_vdpa_device_id(const char *path); + /** * Set the feature bits the vhost-user driver supports. * @@ -464,6 +499,17 @@ int rte_vhost_vring_call(int vid, uint16_t vring_idx); */ uint32_t rte_vhost_rx_queue_count(int vid, uint16_t qid); +/** + * Get vdpa device id for vhost device. + * + * @param vid + * vhost device id + * @return + * device id + */ +int __rte_experimental +rte_vhost_get_vdpa_device_id(int vid); + #ifdef __cplusplus } #endif diff --git a/lib/librte_vhost/rte_vhost_version.map b/lib/librte_vhost/rte_vhost_version.map index d3453a2a78..e30285d7f0 100644 --- a/lib/librte_vhost/rte_vhost_version.map +++ b/lib/librte_vhost/rte_vhost_version.map @@ -65,4 +65,8 @@ EXPERIMENTAL { rte_vdpa_unregister_device; rte_vdpa_find_device_id; rte_vdpa_get_device; + rte_vhost_driver_attach_vdpa_device; + rte_vhost_driver_detach_vdpa_device; + rte_vhost_driver_get_vdpa_device_id; + rte_vhost_get_vdpa_device_id; } DPDK_18.02; diff --git a/lib/librte_vhost/socket.c b/lib/librte_vhost/socket.c index a0a95f9506..b26bdb0b16 100644 --- a/lib/librte_vhost/socket.c +++ b/lib/librte_vhost/socket.c @@ -51,6 +51,13 @@ struct vhost_user_socket { uint64_t supported_features; uint64_t features; + /* + * Device id to identify a specific backend device. + * It's set to -1 for the default software implementation. + * If valid, one socket can have 1 connection only. + */ + int vdpa_dev_id; + struct vhost_device_ops const *notify_ops; }; @@ -545,6 +552,52 @@ find_vhost_user_socket(const char *path) return NULL; } +int +rte_vhost_driver_attach_vdpa_device(const char *path, int did) +{ + struct vhost_user_socket *vsocket; + + if (rte_vdpa_get_device(did) == NULL) + return -1; + + pthread_mutex_lock(&vhost_user.mutex); + vsocket = find_vhost_user_socket(path); + if (vsocket) + vsocket->vdpa_dev_id = did; + pthread_mutex_unlock(&vhost_user.mutex); + + return vsocket ? 0 : -1; +} + +int +rte_vhost_driver_detach_vdpa_device(const char *path) +{ + struct vhost_user_socket *vsocket; + + pthread_mutex_lock(&vhost_user.mutex); + vsocket = find_vhost_user_socket(path); + if (vsocket) + vsocket->vdpa_dev_id = -1; + pthread_mutex_unlock(&vhost_user.mutex); + + return vsocket ? 0 : -1; +} + +int +rte_vhost_driver_get_vdpa_device_id(const char *path) +{ + struct vhost_user_socket *vsocket; + int did = -1; + + pthread_mutex_lock(&vhost_user.mutex); + vsocket = find_vhost_user_socket(path); + if (vsocket) + did = vsocket->vdpa_dev_id; + pthread_mutex_unlock(&vhost_user.mutex); + + return did; +} + int rte_vhost_driver_disable_features(const char *path, uint64_t features) { diff --git a/lib/librte_vhost/vhost.c b/lib/librte_vhost/vhost.c index f6f12a03b2..16b0f9a6ff 100644 --- a/lib/librte_vhost/vhost.c +++ b/lib/librte_vhost/vhost.c @@ -283,6 +283,7 @@ vhost_new_device(void) dev->vid = i; dev->flags = VIRTIO_DEV_BUILTIN_VIRTIO_NET; dev->slave_req_fd = -1; + dev->vdpa_dev_id = -1; return i; } @@ -310,6 +311,31 @@ vhost_destroy_device(int vid) vhost_devices[vid] = NULL; } +void +vhost_attach_vdpa_device(int vid, int did) +{ + struct virtio_net *dev = get_device(vid); + + if (dev == NULL) + return; + + if (rte_vdpa_get_device(did) == NULL) + return; + + dev->vdpa_dev_id = did; +} + +void +vhost_detach_vdpa_device(int vid) +{ + struct virtio_net *dev = get_device(vid); + + if (dev == NULL) + return; + + dev->vdpa_dev_id = -1; +} + void vhost_set_ifname(int vid, const char *if_name, unsigned int if_len) { @@ -614,3 +640,13 @@ rte_vhost_rx_queue_count(int vid, uint16_t qid) return *((volatile uint16_t *)&vq->avail->idx) - vq->last_avail_idx; } + +int rte_vhost_get_vdpa_device_id(int vid) +{ + struct virtio_net *dev = get_device(vid); + + if (dev == NULL) + return -1; + + return dev->vdpa_dev_id; +} diff --git a/lib/librte_vhost/vhost.h b/lib/librte_vhost/vhost.h index 53d8a80e39..453d9a386d 100644 --- a/lib/librte_vhost/vhost.h +++ b/lib/librte_vhost/vhost.h @@ -20,6 +20,7 @@ #include #include "rte_vhost.h" +#include "rte_vdpa.h" /* Used to indicate that the device is running on a data core */ #define VIRTIO_DEV_RUNNING 1 @@ -240,6 +241,12 @@ struct virtio_net { struct guest_page *guest_pages; int slave_req_fd; + + /* + * Device id to identify a specific backend device. + * It's set to -1 for the default software implementation. + */ + int vdpa_dev_id; } __rte_cache_aligned; @@ -362,6 +369,9 @@ void free_vq(struct vhost_virtqueue *vq); int alloc_vring_queue(struct virtio_net *dev, uint32_t vring_idx); +void vhost_attach_vdpa_device(int vid, int did); +void vhost_detach_vdpa_device(int vid); + void vhost_set_ifname(int, const char *if_name, unsigned int if_len); void vhost_enable_dequeue_zero_copy(int vid); void vhost_set_builtin_virtio_net(int vid, bool enable);