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From: Li Feng <fengli@smartx.com>
To: Maxime Coquelin <maxime.coquelin@redhat.com>,
 Tiwei Bie <tiwei.bie@intel.com>, Zhihong Wang <zhihong.wang@intel.com>
Cc: dev@dpdk.org,
	Li Feng <fengli@smartx.com>
Date: Wed,  4 Dec 2019 13:13:20 +0800
Message-Id: <20191204051320.26326-1-fengli@smartx.com>
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Subject: [dpdk-dev] [PATCH v2] vhost: add config change slave msg support
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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@smartx.com>
---
v2:
* Fix a little log typo.

 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..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;
 }
=20
+static int
+vhost_user_slave_config_change(struct virtio_net *dev)
+{
+	int ret;
+	struct VhostUserMsg msg =3D {
+		.request.slave =3D VHOST_USER_SLAVE_CONFIG_CHANGE_MSG,
+		.flags =3D VHOST_USER_VERSION,
+		.size =3D 0,
+	};
+
+	ret =3D 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 =3D 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 =3D 0,
 	VHOST_USER_SLAVE_IOTLB_MSG =3D 1,
+	VHOST_USER_SLAVE_CONFIG_CHANGE_MSG =3D 2,
 	VHOST_USER_SLAVE_VRING_HOST_NOTIFIER_MSG =3D 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 p=
erm);
+int rte_vhost_user_slave_config_change(int vid);
=20
 /* socket.c */
 int read_fd_message(int sockfd, char *buf, int buflen, int *fds, int max_f=
ds,
--=20
2.11.0


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