[RFC PATCH net-next 3/4] veth: backup classid befor switch net_ns

[Libo Chen <clbchenlibo.chen-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>]

dev_forward_skb will clear skb->sk, so we need save classid
before that, otherwise the skb can not be under control by
net_cls.

Signed-off-by: Libo Chen <clbchenlibo.chen-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
---
 drivers/net/veth.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index 2ec2041..ce43a2d 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -18,6 +18,7 @@
 #include <net/xfrm.h>
 #include <linux/veth.h>
 #include <linux/module.h>
+#include <net/cls_cgroup.h>

 #define DRV_NAME	"veth"
 #define DRV_VERSION	"1.0"
@@ -123,6 +124,12 @@ static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev)
 	    rcv->features & NETIF_F_RXCSUM)
 		skb->ip_summed = CHECKSUM_UNNECESSARY;

+	/**
+	 * dev_forward_sbk will clear skb->sk, so save
+	 * skb->sk->sk_classid for Qos
+	 */
+	bk_cls_classid(skb);
+
 	if (likely(dev_forward_skb(rcv, skb) == NET_RX_SUCCESS)) {
 		struct pcpu_vstats *stats = this_cpu_ptr(dev->vstats);

-- 
1.8.2.2