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

[Takayuki Usui <takayuki@midokura.com>]

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@midokura.com>
---
 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