[PATCH] kni: create KNI interface in current network namespace

[PATCH] kni: create KNI interface in current network namespace

[Takayuki Usui]

With this patch, KNI interface (e.g. vEth0) is created in the
network namespace where the DPDK application is running.
Otherwise, all interfaces are created in the default namespace
in the host.

Signed-off-by: Takayuki Usui <takayuki-SN072n759w5Wk0Htik3J/w@public.gmane.org>
---
 lib/librte_eal/linuxapp/kni/kni_misc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/librte_eal/linuxapp/kni/kni_misc.c b/lib/librte_eal/linuxapp/kni/kni_misc.c
index ba77776..f4a9965 100644
--- a/lib/librte_eal/linuxapp/kni/kni_misc.c
+++ b/lib/librte_eal/linuxapp/kni/kni_misc.c
@@ -354,6 +354,8 @@ kni_ioctl_create(unsigned int ioctl_num, unsigned long ioctl_param)
 		return -EBUSY;
 	}
 
+	dev_net_set(net_dev, get_net_ns_by_pid(current->pid));
+
 	kni = netdev_priv(net_dev);
 
 	kni->net_dev = net_dev;
-- 
2.1.3

Re: [PATCH] kni: create KNI interface in current network namespace

[Thomas Monjalon]

Anyone to review this KNI patch?

2014-11-21 12:10, Takayuki Usui:
> With this patch, KNI interface (e.g. vEth0) is created in the
> network namespace where the DPDK application is running.
> Otherwise, all interfaces are created in the default namespace
> in the host.
> 
> Signed-off-by: Takayuki Usui <takayuki-SN072n759w5Wk0Htik3J/w@public.gmane.org>
> ---
>  lib/librte_eal/linuxapp/kni/kni_misc.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/lib/librte_eal/linuxapp/kni/kni_misc.c b/lib/librte_eal/linuxapp/kni/kni_misc.c
> index ba77776..f4a9965 100644
> --- a/lib/librte_eal/linuxapp/kni/kni_misc.c
> +++ b/lib/librte_eal/linuxapp/kni/kni_misc.c
> @@ -354,6 +354,8 @@ kni_ioctl_create(unsigned int ioctl_num, unsigned long ioctl_param)
>  		return -EBUSY;
>  	}
>  
> +	dev_net_set(net_dev, get_net_ns_by_pid(current->pid));
> +
>  	kni = netdev_priv(net_dev);
>  
>  	kni->net_dev = net_dev;

Re: [PATCH] kni: create KNI interface in current network namespace

[Nicolas Dichtel]

Le 21/11/2014 04:10, Takayuki Usui a écrit :
> With this patch, KNI interface (e.g. vEth0) is created in the
> network namespace where the DPDK application is running.
> Otherwise, all interfaces are created in the default namespace
> in the host.
>
> Signed-off-by: Takayuki Usui <takayuki-SN072n759w5Wk0Htik3J/w@public.gmane.org>
> ---
>   lib/librte_eal/linuxapp/kni/kni_misc.c | 2 ++
>   1 file changed, 2 insertions(+)
>
> diff --git a/lib/librte_eal/linuxapp/kni/kni_misc.c b/lib/librte_eal/linuxapp/kni/kni_misc.c
> index ba77776..f4a9965 100644
> --- a/lib/librte_eal/linuxapp/kni/kni_misc.c
> +++ b/lib/librte_eal/linuxapp/kni/kni_misc.c
> @@ -354,6 +354,8 @@ kni_ioctl_create(unsigned int ioctl_num, unsigned long ioctl_param)
>   		return -EBUSY;
>   	}
>
> +	dev_net_set(net_dev, get_net_ns_by_pid(current->pid));
You should test the returned value and release the refcnt.
net = get_net_ns_by_pid(current->pid)
if (IS_ERR(net))
...
put_net(net);

> +
>   	kni = netdev_priv(net_dev);
>
>   	kni->net_dev = net_dev;
>

Re: [PATCH] kni: create KNI interface in current network namespace

[Hemant-KZfg59tc24xl57MIdRCFDg]

> 2014-11-21 12:10, Takayuki Usui:
> > With this patch, KNI interface (e.g. vEth0) is created in the network
> > namespace where the DPDK application is running.
> > Otherwise, all interfaces are created in the default namespace in the
> > host.
> >
> > Signed-off-by: Takayuki Usui <takayuki-SN072n759w5Wk0Htik3J/w@public.gmane.org>
> > ---
> >  lib/librte_eal/linuxapp/kni/kni_misc.c | 2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/lib/librte_eal/linuxapp/kni/kni_misc.c
> > b/lib/librte_eal/linuxapp/kni/kni_misc.c
> > index ba77776..f4a9965 100644
> > --- a/lib/librte_eal/linuxapp/kni/kni_misc.c
> > +++ b/lib/librte_eal/linuxapp/kni/kni_misc.c
> > @@ -354,6 +354,8 @@ kni_ioctl_create(unsigned int ioctl_num, unsigned
> long ioctl_param)
> >  		return -EBUSY;
> >  	}
> >
> > +	dev_net_set(net_dev, get_net_ns_by_pid(current->pid));
> > +

Another way to get it done is by the following. It will be init_net for the root container.

#ifdef CONFIG_NET_NS
	net_dev->nd_net = current->nsproxy->net_ns; 
#endif
> >  	kni = netdev_priv(net_dev);
> >
> >  	kni->net_dev = net_dev;

Re: [PATCH] kni: create KNI interface in current network namespace

[Nicolas Dichtel]

Le 01/12/2014 06:45, Hemant-KZfg59tc24xl57MIdRCFDg@public.gmane.org a écrit :
>> 2014-11-21 12:10, Takayuki Usui:
>>> With this patch, KNI interface (e.g. vEth0) is created in the network
>>> namespace where the DPDK application is running.
>>> Otherwise, all interfaces are created in the default namespace in the
>>> host.
>>>
>>> Signed-off-by: Takayuki Usui <takayuki-SN072n759w5Wk0Htik3J/w@public.gmane.org>
>>> ---
>>>   lib/librte_eal/linuxapp/kni/kni_misc.c | 2 ++
>>>   1 file changed, 2 insertions(+)
>>>
>>> diff --git a/lib/librte_eal/linuxapp/kni/kni_misc.c
>>> b/lib/librte_eal/linuxapp/kni/kni_misc.c
>>> index ba77776..f4a9965 100644
>>> --- a/lib/librte_eal/linuxapp/kni/kni_misc.c
>>> +++ b/lib/librte_eal/linuxapp/kni/kni_misc.c
>>> @@ -354,6 +354,8 @@ kni_ioctl_create(unsigned int ioctl_num, unsigned
>> long ioctl_param)
>>>   		return -EBUSY;
>>>   	}
>>>
>>> +	dev_net_set(net_dev, get_net_ns_by_pid(current->pid));
>>> +
>
> Another way to get it done is by the following. It will be init_net for the root container.
>
> #ifdef CONFIG_NET_NS
> 	net_dev->nd_net = current->nsproxy->net_ns;
> #endif
No. It's always better to use existing helpers, it hides this kind of ifdef and
more importantly, it do the right things (call release_net()/hold_net())!
Reimplemented helpers is error prone.

[PATCH v2] kni: create KNI interface in current network namespace

[Takayuki Usui]

With this patch, KNI interface (e.g. vEth0) is created in the
network namespace where the DPDK application is running.
Otherwise, all interfaces are created in the default namespace
in the host.

put_net() is required, since get_net_ns_by_pid() increments
the reference counter of the network namespace with get_net().

Signed-off-by: Takayuki Usui <takayuki-SN072n759w5Wk0Htik3J/w@public.gmane.org>
---
 lib/librte_eal/linuxapp/kni/kni_misc.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/lib/librte_eal/linuxapp/kni/kni_misc.c b/lib/librte_eal/linuxapp/kni/kni_misc.c
index ba77776..33c7a48 100644
--- a/lib/librte_eal/linuxapp/kni/kni_misc.c
+++ b/lib/librte_eal/linuxapp/kni/kni_misc.c
@@ -311,6 +311,7 @@ kni_ioctl_create(unsigned int ioctl_num, unsigned long ioctl_param)
 	struct net_device *net_dev = NULL;
 	struct net_device *lad_dev = NULL;
 	struct kni_dev *kni, *dev, *n;
+	struct net *net;
 
 	printk(KERN_INFO "KNI: Creating kni...\n");
 	/* Check the buffer size, to avoid warning */
@@ -354,6 +355,12 @@ kni_ioctl_create(unsigned int ioctl_num, unsigned long ioctl_param)
 		return -EBUSY;
 	}
 
+	net = get_net_ns_by_pid(current->pid);
+	if (IS_ERR(net))
+		return PTR_ERR(net);
+	dev_net_set(net_dev, net);
+	put_net(net);
+
 	kni = netdev_priv(net_dev);
 
 	kni->net_dev = net_dev;
-- 
2.1.3

Re: [PATCH v2] kni: create KNI interface in current network namespace

[Nicolas Dichtel]

Le 02/12/2014 03:19, Takayuki Usui a écrit :
> With this patch, KNI interface (e.g. vEth0) is created in the
> network namespace where the DPDK application is running.
> Otherwise, all interfaces are created in the default namespace
> in the host.
>
> put_net() is required, since get_net_ns_by_pid() increments
> the reference counter of the network namespace with get_net().
>
> Signed-off-by: Takayuki Usui <takayuki-SN072n759w5Wk0Htik3J/w@public.gmane.org>
> ---
>   lib/librte_eal/linuxapp/kni/kni_misc.c | 7 +++++++
>   1 file changed, 7 insertions(+)
>
> diff --git a/lib/librte_eal/linuxapp/kni/kni_misc.c b/lib/librte_eal/linuxapp/kni/kni_misc.c
> index ba77776..33c7a48 100644
> --- a/lib/librte_eal/linuxapp/kni/kni_misc.c
> +++ b/lib/librte_eal/linuxapp/kni/kni_misc.c
> @@ -311,6 +311,7 @@ kni_ioctl_create(unsigned int ioctl_num, unsigned long ioctl_param)
>   	struct net_device *net_dev = NULL;
>   	struct net_device *lad_dev = NULL;
>   	struct kni_dev *kni, *dev, *n;
> +	struct net *net;
>
>   	printk(KERN_INFO "KNI: Creating kni...\n");
>   	/* Check the buffer size, to avoid warning */
> @@ -354,6 +355,12 @@ kni_ioctl_create(unsigned int ioctl_num, unsigned long ioctl_param)
>   		return -EBUSY;
>   	}
>
> +	net = get_net_ns_by_pid(current->pid);
> +	if (IS_ERR(net))
In case of error, you should call free_netdev(net_dev) to avoid a memory leak.

> +		return PTR_ERR(net);
> +	dev_net_set(net_dev, net);
> +	put_net(net);
> +
>   	kni = netdev_priv(net_dev);
>
>   	kni->net_dev = net_dev;
>

[PATCH v3] kni: create KNI interface in current network namespace

[Takayuki Usui]

With this patch, KNI interface (e.g. vEth0) is created in the
network namespace where the DPDK application is running.
Otherwise, all interfaces are created in the default namespace
in the host.

put_net() is required, since get_net_ns_by_pid() increments
the reference counter of the network namespace with get_net().

Signed-off-by: Takayuki Usui <takayuki-SN072n759w5Wk0Htik3J/w@public.gmane.org>
---
 lib/librte_eal/linuxapp/kni/kni_misc.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/lib/librte_eal/linuxapp/kni/kni_misc.c b/lib/librte_eal/linuxapp/kni/kni_misc.c
index ba77776..868b325 100644
--- a/lib/librte_eal/linuxapp/kni/kni_misc.c
+++ b/lib/librte_eal/linuxapp/kni/kni_misc.c
@@ -311,6 +311,7 @@ kni_ioctl_create(unsigned int ioctl_num, unsigned long ioctl_param)
 	struct net_device *net_dev = NULL;
 	struct net_device *lad_dev = NULL;
 	struct kni_dev *kni, *dev, *n;
+	struct net *net;
 
 	printk(KERN_INFO "KNI: Creating kni...\n");
 	/* Check the buffer size, to avoid warning */
@@ -354,6 +355,14 @@ kni_ioctl_create(unsigned int ioctl_num, unsigned long ioctl_param)
 		return -EBUSY;
 	}
 
+	net = get_net_ns_by_pid(current->pid);
+	if (IS_ERR(net)) {
+		free_netdev(net_dev);
+		return PTR_ERR(net);
+	}
+	dev_net_set(net_dev, net);
+	put_net(net);
+
 	kni = netdev_priv(net_dev);
 
 	kni->net_dev = net_dev;
-- 
2.1.3

Re: [PATCH v3] kni: create KNI interface in current network namespace

[Nicolas Dichtel]

Le 03/12/2014 02:37, Takayuki Usui a écrit :
> With this patch, KNI interface (e.g. vEth0) is created in the
> network namespace where the DPDK application is running.
> Otherwise, all interfaces are created in the default namespace
> in the host.
>
> put_net() is required, since get_net_ns_by_pid() increments
> the reference counter of the network namespace with get_net().
>
> Signed-off-by: Takayuki Usui <takayuki-SN072n759w5Wk0Htik3J/w@public.gmane.org>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel-pdR9zngts4EAvxtiuMwx3w@public.gmane.org>

Re: [PATCH v3] kni: create KNI interface in current network namespace

[Thomas Monjalon]

> > With this patch, KNI interface (e.g. vEth0) is created in the
> > network namespace where the DPDK application is running.
> > Otherwise, all interfaces are created in the default namespace
> > in the host.
> >
> > put_net() is required, since get_net_ns_by_pid() increments
> > the reference counter of the network namespace with get_net().
> >
> > Signed-off-by: Takayuki Usui <takayuki-SN072n759w5Wk0Htik3J/w@public.gmane.org>
> Signed-off-by: Nicolas Dichtel <nicolas.dichtel-pdR9zngts4EAvxtiuMwx3w@public.gmane.org>

Applied

Thanks
-- 
Thomas