Re: [dpdk-dev] [PATCH 3/3] vhost: call api to unregister vhost driver

["Ouyang, Changchun" <changchun.ouyang@intel.com>]

> -----Original Message-----
> From: Xie, Huawei
> Sent: Friday, July 3, 2015 12:04 AM
> To: Ouyang, Changchun; dev@dpdk.org
> Cc: Cao, Waterman; Xu, Qian Q
> Subject: Re: [PATCH 3/3] vhost: call api to unregister vhost driver
> 
> On 7/2/2015 11:33 AM, Ouyang, Changchun wrote:
> > The commit will break vhost sample when it runs in second time:
> > 292959c71961acde0cda6e77e737bb0a4df1559c
> >
> > It should call api to unregister vhost driver when sample exit/quit,
> > then the socket file will be removed(by calling unlink), and thus make
> > vhost sample work correctly in second time startup.
> >
> > Signed-off-by: Changchun Ouyang <changchun.ouyang@intel.com>
> > ---
> >  examples/vhost/main.c | 18 ++++++++++++++++++
> >  1 file changed, 18 insertions(+)
> >
> > diff --git a/examples/vhost/main.c b/examples/vhost/main.c index
> > 72c4773..90666b3 100644
> > --- a/examples/vhost/main.c
> > +++ b/examples/vhost/main.c
> > @@ -2871,6 +2871,16 @@ setup_mempool_tbl(int socket, uint32_t index,
> char *pool_name,
> >  	}
> >  }
> >
> > +/* When we receive a HUP signal, unregister vhost driver */ static
> > +void sighup_handler(__rte_unused int signum) {
> > +	/* Unregister vhost driver. */
> > +	int ret = rte_vhost_driver_unregister((char *)&dev_basename);
> > +	if (ret != 0)
> > +		rte_exit(EXIT_FAILURE, "vhost driver unregister failure.\n");
> > +	exit(0);
> > +}
> >
> >  /*
> >   * Main function, does initialisation and calls the per-lcore
> > functions. The CUSE @@ -2887,6 +2897,8 @@ main(int argc, char *argv[])
> >  	uint16_t queue_id;
> >  	static pthread_t tid;
> >
> > +	signal(SIGINT, sighup_handler);
> > +
> 
> ignor if duplciated.
> sighup->sigint

Make sense, will update it in v2

> 
> >  	/* init EAL */
> >  	ret = rte_eal_init(argc, argv);
> >  	if (ret < 0)
> > @@ -3060,6 +3072,12 @@ main(int argc, char *argv[])
> >
> >  	/* Start CUSE session. */
> >  	rte_vhost_driver_session_start();
> > +
> > +	/* Unregister vhost driver. */
> > +	ret = rte_vhost_driver_unregister((char *)&dev_basename);
> > +	if (ret != 0)
> > +		rte_exit(EXIT_FAILURE,"vhost driver unregister failure.\n");
> > +
> >  	return 0;
> >
> >  }