diff mbox series

[v5] vhost: add config change slave msg support

Message ID 20191220082256.26490-1-fengli@smartx.com (mailing list archive)
State Accepted, archived
Delegated to: Maxime Coquelin
Headers
Series [v5] vhost: add config change slave msg support |

Checks

Context Check Description
ci/checkpatch success coding style OK
ci/iol-testing success Testing PASS
ci/iol-mellanox-Performance success Performance Testing PASS
ci/travis-robot warning Travis build: failed
ci/iol-intel-Performance success Performance Testing PASS
ci/Intel-compilation success Compilation OK

Commit Message

Li Feng Dec. 20, 2019, 8:22 a.m. UTC 
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
capacity of backend has changed.

The need_reply flag is not mandatory because it will block the sender
thread and master process will send get_config message to fetch the
configuration, this need an extra thread to process the vhost message.

Signed-off-by: Li Feng <fengli@smartx.com>
---
v5:
* Fix code style.

v4:
* Fix type and code style.
* Add need_reply support.

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           | 15 ++++++++++++++
 lib/librte_vhost/rte_vhost_version.map |  1 +
 lib/librte_vhost/vhost_user.c          | 36 ++++++++++++++++++++++++++++++++++
 lib/librte_vhost/vhost_user.h          |  1 +
 4 files changed, 53 insertions(+)

Comments

Maxime Coquelin Jan. 14, 2020, 2:57 p.m. UTC | #1 
On 12/20/19 9:22 AM, Li Feng wrote:
> 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
> capacity of backend has changed.
> 
> The need_reply flag is not mandatory because it will block the sender
> thread and master process will send get_config message to fetch the
> configuration, this need an extra thread to process the vhost message.
> 
> Signed-off-by: Li Feng <fengli@smartx.com>
> ---
> v5:
> * Fix code style.
> 
> v4:
> * Fix type and code style.
> * Add need_reply support.
> 
> 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           | 15 ++++++++++++++
>  lib/librte_vhost/rte_vhost_version.map |  1 +
>  lib/librte_vhost/vhost_user.c          | 36 ++++++++++++++++++++++++++++++++++
>  lib/librte_vhost/vhost_user.h          |  1 +
>  4 files changed, 53 insertions(+)
> 


Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>

Thanks,
Maxime
Maxime Coquelin Jan. 15, 2020, 11:18 a.m. UTC | #2 
On 12/20/19 9:22 AM, Li Feng wrote:
> 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
> capacity of backend has changed.
> 
> The need_reply flag is not mandatory because it will block the sender
> thread and master process will send get_config message to fetch the
> configuration, this need an extra thread to process the vhost message.
> 
> Signed-off-by: Li Feng <fengli@smartx.com>
> ---
> v5:
> * Fix code style.
> 
> v4:
> * Fix type and code style.
> * Add need_reply support.
> 
> 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           | 15 ++++++++++++++
>  lib/librte_vhost/rte_vhost_version.map |  1 +
>  lib/librte_vhost/vhost_user.c          | 36 ++++++++++++++++++++++++++++++++++
>  lib/librte_vhost/vhost_user.h          |  1 +
>  4 files changed, 53 insertions(+)

Applied to dpdk-next-virtio/master

Thanks,
Maxime
diff mbox series

Patch

diff --git a/lib/librte_vhost/rte_vhost.h b/lib/librte_vhost/rte_vhost.h
index 7b5dc87c2..c7b619ae0 100644
--- a/lib/librte_vhost/rte_vhost.h
+++ b/lib/librte_vhost/rte_vhost.h
@@ -10,6 +10,7 @@ 
  * Interface to vhost-user
  */
 
+#include <stdbool.h>
 #include <stdint.h>
 #include <sys/eventfd.h>
 
@@ -977,6 +978,20 @@  __rte_experimental
 int
 rte_vhost_get_vdpa_device_id(int vid);
 
+/**
+ * Notify the guest that should get virtio configuration space from backend.
+ *
+ * @param vid
+ *  vhost device ID
+ * @param need_reply
+ *  wait for the master response the status of this operation
+ * @return
+ *  0 on success, < 0 on failure
+ */
+__rte_experimental
+int
+rte_vhost_slave_config_change(int vid, bool need_reply);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/lib/librte_vhost/rte_vhost_version.map b/lib/librte_vhost/rte_vhost_version.map
index c512377fe..051d08c12 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_slave_config_change;
 };
diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
index 0cfb8b792..defd82a19 100644
--- a/lib/librte_vhost/vhost_user.c
+++ b/lib/librte_vhost/vhost_user.c
@@ -2840,6 +2840,42 @@  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, bool need_reply)
+{
+	int ret;
+	struct VhostUserMsg msg = {
+		.request.slave = VHOST_USER_SLAVE_CONFIG_CHANGE_MSG,
+		.flags = VHOST_USER_VERSION,
+		.size = 0,
+	};
+
+	if (need_reply)
+		msg.flags |= VHOST_USER_NEED_REPLY;
+
+	ret = send_vhost_slave_message(dev, &msg);
+	if (ret < 0) {
+		RTE_LOG(ERR, VHOST_CONFIG,
+			"Failed to send config change (%d)\n",
+			ret);
+		return ret;
+	}
+
+	return process_slave_message_reply(dev, &msg);
+}
+
+int
+rte_vhost_slave_config_change(int vid, bool need_reply)
+{
+	struct virtio_net *dev;
+
+	dev = get_device(vid);
+	if (!dev)
+		return -ENODEV;
+
+	return vhost_user_slave_config_change(dev, need_reply);
+}
+
 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;