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

[Wenfeng Liu <liuwf@arraynetworks.com.cn>]

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. 

Thanks,
liuwf

-----邮件原件-----
发件人: Zhang, Helin [mailto:helin.zhang@intel.com] 
发送时间: 2015年6月17日 11:59
收件人: Wenfeng Liu
抄送: dev@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@arraynetworks.com.cn]
> Sent: Monday, June 15, 2015 12:08 PM
> To: Zhang, Helin; dev@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@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