[dpdk-dev] [PATCH] vhost: add config change slave msg support

Li Feng fengli at smartx.com
Mon Dec 2 15:57:35 CET 2019


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 <fengli at smartx.com>
---
 lib/librte_vhost/vhost_user.c | 31 +++++++++++++++++++++++++++++++
 lib/librte_vhost/vhost_user.h |  2 ++
 2 files changed, 33 insertions(+)

diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
index 0cfb8b792..4126fa32d 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..5c1bb2138 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;
@@ -158,6 +159,7 @@ typedef struct VhostUserMsg {
 /* vhost_user.c */
 int vhost_user_msg_handler(int vid, int fd);
 int vhost_user_iotlb_miss(struct virtio_net *dev, uint64_t iova, uint8_t perm);
+int rte_vhost_user_slave_config_change(int vid);
 
 /* socket.c */
 int read_fd_message(int sockfd, char *buf, int buflen, int *fds, int max_fds,
-- 
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.




More information about the dev mailing list