[dpdk-dev] [PATCH] kni: Passing task_pid_vnr(current) to get_net_ns_by_pid() in kni_ioctl_create()

[Zhang, Helin]

> -----Original Message-----
> From: Wenfeng Liu [mailto:liuwf at arraynetworks.com.cn]
> Sent: Wednesday, June 17, 2015 1:44 PM
> To: Zhang, Helin
> Cc: dev at dpdk.org
> Subject: 答复: [PATCH] kni: Passing task_pid_vnr(current) to
> get_net_ns_by_pid() in kni_ioctl_create()
> 
> Hi Helin,
> 
> Since I don’t have any 2.6.33 machine on hand right now, I tried to compile this
> patch on 2.6.32, and it succeed.
> I can't verify this modification in docker since it only support Linux kernel >= 3.10.
OK, I think it should be enough. Thanks!

- Helin

> 
> Thanks,
> liuwf
> 
> -----邮件原件-----
> 发件人: Zhang, Helin [mailto:helin.zhang at intel.com]
> 发送时间: 2015年6月17日 11:59
> 收件人: Wenfeng Liu
> 抄送: dev at dpdk.org
> 主题: RE: [PATCH] kni: Passing task_pid_vnr(current) to get_net_ns_by_pid() in
> kni_ioctl_create()
> 
> 
> 
> > -----Original Message-----
> > From: Wenfeng Liu [mailto:liuwf at arraynetworks.com.cn]
> > Sent: Monday, June 15, 2015 12:08 PM
> > To: Zhang, Helin; dev at dpdk.org
> > Subject: [PATCH] kni: Passing task_pid_vnr(current) to
> > get_net_ns_by_pid() in
> > kni_ioctl_create()
> >
> > In containers like docker, current->pid returns current process's
> > global PID instead of its own PID under containers's PID namespace,
> > and
> > get_net_ns_by_pid() suppose to accept a virtual PID under its own
> > namespace, so we should use task_pid_vnr(current) to get current
> > process's virtual PID instead of current->pid.
> >
> > Signed-off-by: Wenfeng Liu <liuwf at arraynetworks.com.cn>
> > ---
> >  lib/librte_eal/linuxapp/kni/kni_misc.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/lib/librte_eal/linuxapp/kni/kni_misc.c
> > b/lib/librte_eal/linuxapp/kni/kni_misc.c
> > index 1935d32..18fb677 100644
> > --- a/lib/librte_eal/linuxapp/kni/kni_misc.c
> > +++ b/lib/librte_eal/linuxapp/kni/kni_misc.c
> > @@ -359,7 +359,7 @@ kni_ioctl_create(unsigned int ioctl_num, unsigned
> > long
> > ioctl_param)
> >  		return -EBUSY;
> >  	}
> >
> > -	net = get_net_ns_by_pid(current->pid);
> > +	net = get_net_ns_by_pid(task_pid_vnr(current));
> Have you tried it on a very old kernel versions? E.g. 2.6.33
> 
> Helin
> 
> >  	if (IS_ERR(net)) {
> >  		free_netdev(net_dev);
> >  		return PTR_ERR(net);
> > --
> > 1.8.3.1