This msg is used to notify qemu that should get the config of backend. For example, vhost-user-blk uses this msg to notify guest os the compacity of backend has changed.
Signed-off-by: Li Feng <fen...@smartx.com> --- v3: * Move the declare to rte_vhost.h * Add the symbol in rte_vhost_version.map v2: * Fix a little log typo. lib/librte_vhost/rte_vhost.h | 12 ++++++++++++ lib/librte_vhost/rte_vhost_version.map | 1 + lib/librte_vhost/vhost_user.c | 31 +++++++++++++++++++++++++++++++ lib/librte_vhost/vhost_user.h | 1 + 4 files changed, 45 insertions(+) diff --git a/lib/librte_vhost/rte_vhost.h b/lib/librte_vhost/rte_vhost.h index 7b5dc87c2..fc28da264 100644 --- a/lib/librte_vhost/rte_vhost.h +++ b/lib/librte_vhost/rte_vhost.h @@ -977,6 +977,18 @@ __rte_experimental int rte_vhost_get_vdpa_device_id(int vid); +/** + * Notify the guest that should get config from backend. + * + * @param vid + * vhost device ID + * @return + * 0 on success, < 0 on failure + */ +__rte_experimental +int +rte_vhost_user_slave_config_change(int vid); + #ifdef __cplusplus } #endif diff --git a/lib/librte_vhost/rte_vhost_version.map b/lib/librte_vhost/rte_vhost_version.map index c512377fe..acf013d6d 100644 --- a/lib/librte_vhost/rte_vhost_version.map +++ b/lib/librte_vhost/rte_vhost_version.map @@ -65,4 +65,5 @@ EXPERIMENTAL { rte_vhost_clr_inflight_desc_packed; rte_vhost_get_vhost_ring_inflight; rte_vhost_get_vring_base_from_inflight; + rte_vhost_user_slave_config_change; }; diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c index 0cfb8b792..10f2e47d5 100644 --- a/lib/librte_vhost/vhost_user.c +++ b/lib/librte_vhost/vhost_user.c @@ -2840,6 +2840,37 @@ vhost_user_iotlb_miss(struct virtio_net *dev, uint64_t iova, uint8_t perm) return 0; } +static int +vhost_user_slave_config_change(struct virtio_net *dev) +{ + int ret; + struct VhostUserMsg msg = { + .request.slave = VHOST_USER_SLAVE_CONFIG_CHANGE_MSG, + .flags = VHOST_USER_VERSION, + .size = 0, + }; + + ret = send_vhost_message(dev->slave_req_fd, &msg); + if (ret < 0) { + RTE_LOG(ERR, VHOST_CONFIG, + "Failed to send config change (%d)\n", + ret); + return ret; + } + + return 0; +} + +int +rte_vhost_user_slave_config_change(int vid) +{ + struct virtio_net *dev; + dev = get_device(vid); + if (!dev) + return -ENODEV; + return vhost_user_slave_config_change(dev); +} + static int vhost_user_slave_set_vring_host_notifier(struct virtio_net *dev, int index, int fd, uint64_t offset, diff --git a/lib/librte_vhost/vhost_user.h b/lib/librte_vhost/vhost_user.h index 6563f7315..86c364a93 100644 --- a/lib/librte_vhost/vhost_user.h +++ b/lib/librte_vhost/vhost_user.h @@ -62,6 +62,7 @@ typedef enum VhostUserRequest { typedef enum VhostUserSlaveRequest { VHOST_USER_SLAVE_NONE = 0, VHOST_USER_SLAVE_IOTLB_MSG = 1, + VHOST_USER_SLAVE_CONFIG_CHANGE_MSG = 2, VHOST_USER_SLAVE_VRING_HOST_NOTIFIER_MSG = 3, VHOST_USER_SLAVE_MAX } VhostUserSlaveRequest; -- 2.11.0 -- The SmartX email address is only for business purpose. Any sent message that is not related to the business is not authorized or permitted by SmartX. 本邮箱为北京志凌海纳科技有限公司(SmartX)工作邮箱. 如本邮箱发出的邮件与工作无关,该邮件未得到本公司任何的明示或默示的授权.