[dpdk-dev,v4,2/4] vhost: vhost unix domain socket cleanup

  rte_vhost_driver_unregister API will remove the listenfd from event list,
and then close it.

v2 changes:
-minor code style fix, remove unnecessary new line

Signed-off-by: Huawei Xie <huawei.xie@intel.com>
Signed-off-by: Peng Sun <peng.a.sun@intel.com>
---
 lib/librte_vhost/rte_virtio_net.h            |  3 ++
 lib/librte_vhost/vhost_cuse/vhost-net-cdev.c |  9 ++++
 lib/librte_vhost/vhost_user/vhost-net-user.c | 68 +++++++++++++++++++++++-----
 lib/librte_vhost/vhost_user/vhost-net-user.h |  2 +-
 4 files changed, 69 insertions(+), 13 deletions(-)
  

> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Huawei Xie
> Sent: Tuesday, June 30, 2015 5:21 PM
> To: dev@dpdk.org
> Subject: [dpdk-dev] [PATCH v4 2/4] vhost: vhost unix domain socket cleanup
> 
> rte_vhost_driver_unregister API will remove the listenfd from event list, and
> then close it.
> 
> v2 changes:
> -minor code style fix, remove unnecessary new line
> 
> Signed-off-by: Huawei Xie <huawei.xie@intel.com>
> Signed-off-by: Peng Sun <peng.a.sun@intel.com>

Acked-by: Changchun Ouyang <changchun.ouyang@intel.com>

> ---
>  lib/librte_vhost/rte_virtio_net.h            |  3 ++
>  lib/librte_vhost/vhost_cuse/vhost-net-cdev.c |  9 ++++
> lib/librte_vhost/vhost_user/vhost-net-user.c | 68
> +++++++++++++++++++++++-----  lib/librte_vhost/vhost_user/vhost-net-
> user.h |  2 +-
>  4 files changed, 69 insertions(+), 13 deletions(-)
> 
> diff --git a/lib/librte_vhost/rte_virtio_net.h
> b/lib/librte_vhost/rte_virtio_net.h
> index 5d38185..5630fbc 100644
> --- a/lib/librte_vhost/rte_virtio_net.h
> +++ b/lib/librte_vhost/rte_virtio_net.h
> @@ -188,6 +188,9 @@ int rte_vhost_enable_guest_notification(struct
> virtio_net *dev, uint16_t queue_i
>  /* Register vhost driver. dev_name could be different for multiple instance
> support. */  int rte_vhost_driver_register(const char *dev_name);
> 
> +/* Unregister vhost driver. This is only meaningful to vhost user. */
> +int rte_vhost_driver_unregister(const char *dev_name);
> +
>  /* Register callbacks. */
>  int rte_vhost_driver_callback_register(struct virtio_net_device_ops const *
> const);
>  /* Start vhost driver session blocking loop. */ diff --git
> a/lib/librte_vhost/vhost_cuse/vhost-net-cdev.c
> b/lib/librte_vhost/vhost_cuse/vhost-net-cdev.c
> index 6b68abf..1ae7c49 100644
> --- a/lib/librte_vhost/vhost_cuse/vhost-net-cdev.c
> +++ b/lib/librte_vhost/vhost_cuse/vhost-net-cdev.c
> @@ -405,6 +405,15 @@ rte_vhost_driver_register(const char *dev_name)  }
> 
>  /**
> + * An empty function for unregister
> + */
> +int
> +rte_vhost_driver_unregister(const char *dev_name __rte_unused) {
> +	return 0;
> +}
> +
> +/**
>   * The CUSE session is launched allowing the application to receive open,
>   * release and ioctl calls.
>   */
> diff --git a/lib/librte_vhost/vhost_user/vhost-net-user.c
> b/lib/librte_vhost/vhost_user/vhost-net-user.c
> index 31f1215..87a4711 100644
> --- a/lib/librte_vhost/vhost_user/vhost-net-user.c
> +++ b/lib/librte_vhost/vhost_user/vhost-net-user.c
> @@ -66,6 +66,8 @@ struct connfd_ctx {
>  struct _vhost_server {
>  	struct vhost_server *server[MAX_VHOST_SERVER];
>  	struct fdset fdset;
> +	int vserver_cnt;
> +	pthread_mutex_t server_mutex;
>  };
> 
>  static struct _vhost_server g_vhost_server = { @@ -74,10 +76,10 @@ static
> struct _vhost_server g_vhost_server = {
>  		.fd_mutex = PTHREAD_MUTEX_INITIALIZER,
>  		.num = 0
>  	},
> +	.vserver_cnt = 0,
> +	.server_mutex = PTHREAD_MUTEX_INITIALIZER,
>  };
> 
> -static int vserver_idx;
> -
>  static const char *vhost_message_str[VHOST_USER_MAX] = {
>  	[VHOST_USER_NONE] = "VHOST_USER_NONE",
>  	[VHOST_USER_GET_FEATURES] = "VHOST_USER_GET_FEATURES",
> @@ -427,7 +429,6 @@ vserver_message_handler(int connfd, void *dat, int
> *remove)
>  	}
>  }
> 
> -
>  /**
>   * Creates and initialise the vhost server.
>   */
> @@ -436,34 +437,77 @@ rte_vhost_driver_register(const char *path)  {
>  	struct vhost_server *vserver;
> 
> -	if (vserver_idx == 0)
> +	pthread_mutex_lock(&g_vhost_server.server_mutex);
> +	if (ops == NULL)
>  		ops = get_virtio_net_callbacks();
> -	if (vserver_idx == MAX_VHOST_SERVER)
> +
> +	if (g_vhost_server.vserver_cnt == MAX_VHOST_SERVER) {
> +		RTE_LOG(ERR, VHOST_CONFIG,
> +			"error: the number of servers reaches maximum\n");
> +		pthread_mutex_unlock(&g_vhost_server.server_mutex);
>  		return -1;
> +	}
> 
>  	vserver = calloc(sizeof(struct vhost_server), 1);
> -	if (vserver == NULL)
> +	if (vserver == NULL) {
> +		pthread_mutex_unlock(&g_vhost_server.server_mutex);
>  		return -1;
> -
> -	unlink(path);
> +	}
> 
>  	vserver->listenfd = uds_socket(path);
>  	if (vserver->listenfd < 0) {
>  		free(vserver);
> +		pthread_mutex_unlock(&g_vhost_server.server_mutex);
>  		return -1;
>  	}
> -	vserver->path = path;
> +
> +	vserver->path = strdup(path);
> 
>  	fdset_add(&g_vhost_server.fdset, vserver->listenfd,
> -		vserver_new_vq_conn, NULL,
> -		vserver);
> +		vserver_new_vq_conn, NULL, vserver);
> 
> -	g_vhost_server.server[vserver_idx++] = vserver;
> +	g_vhost_server.server[g_vhost_server.vserver_cnt++] = vserver;
> +	pthread_mutex_unlock(&g_vhost_server.server_mutex);
> 
>  	return 0;
>  }
> 
> 
> +/**
> + * Unregister the specified vhost server  */ int
> +rte_vhost_driver_unregister(const char *path) {
> +	int i;
> +	int count;
> +
> +	pthread_mutex_lock(&g_vhost_server.server_mutex);
> +
> +	for (i = 0; i < g_vhost_server.vserver_cnt; i++) {
> +		if (!strcmp(g_vhost_server.server[i]->path, path)) {
> +			fdset_del(&g_vhost_server.fdset,
> +				g_vhost_server.server[i]->listenfd);
> +
> +			close(g_vhost_server.server[i]->listenfd);
> +			free(g_vhost_server.server[i]->path);
> +			free(g_vhost_server.server[i]);
> +
> +			unlink(path);
> +
> +			count = --g_vhost_server.vserver_cnt;
> +			g_vhost_server.server[i] =
> g_vhost_server.server[count];
> +			g_vhost_server.server[count] = NULL;
> +
> 	pthread_mutex_unlock(&g_vhost_server.server_mutex);
> +
> +			return 0;
> +		}
> +	}
> +	pthread_mutex_unlock(&g_vhost_server.server_mutex);
> +
> +	return -1;
> +}
> +
>  int
>  rte_vhost_driver_session_start(void)
>  {
> diff --git a/lib/librte_vhost/vhost_user/vhost-net-user.h
> b/lib/librte_vhost/vhost_user/vhost-net-user.h
> index 1b6be6c..2e72f3c 100644
> --- a/lib/librte_vhost/vhost_user/vhost-net-user.h
> +++ b/lib/librte_vhost/vhost_user/vhost-net-user.h
> @@ -41,7 +41,7 @@
>  #include "fd_man.h"
> 
>  struct vhost_server {
> -	const char *path; /**< The path the uds is bind to. */
> +	char *path; /**< The path the uds is bind to. */
>  	int listenfd;     /**< The listener sockfd. */
>  };
> 
> --
> 1.8.1.4