# \[RFC PATCH 02/29\] net: Flip net\_device to use net\_ctx

- From: David Ahern \<hidden\>
- Date: 2015-02-05 01:35:55 
- List: netdev
- Page: https://ratatoskr.run/netdev/2015/02/10977328
- Thread: https://ratatoskr.run/netdev/2015/02/10977327/t.md

```text
Enhances a net_device from the current namespace only assignment to
a network context.

Define nd_net macro to handle existing code references. Add macros
for generating net_ctx struct given a net_device (needed because of
the way net references are done) and for comparing a given net_ctx
struct to the context of a net_device.

Signed-off-by: David Ahern <redacted>
---
 include/linux/netdevice.h | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 16251e96e6aa..55a221fec12b 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1697,9 +1697,8 @@ struct net_device {
 	struct netpoll_info __rcu	*npinfo;
 #endif
 
-#ifdef CONFIG_NET_NS
-	struct net		*nd_net;
-#endif
+	struct net_ctx		net_ctx;
+#define nd_net net_ctx.net
 
 	/* mid-layer private */
 	union {
@@ -1845,6 +1844,18 @@ void dev_net_set(struct net_device *dev, struct net *net)
 #endif
 }
 
+/* get net_ctx from device */
+#define DEV_NET_CTX(dev)  { .net = dev_net((dev)) }
+
+static inline
+int dev_net_ctx_eq(const struct net_device *dev, struct net_ctx *ctx)
+{
+	if (net_eq(dev_net(dev), ctx->net))
+		return 1;
+
+	return 0;
+}
+
 static inline bool netdev_uses_dsa(struct net_device *dev)
 {
 #if IS_ENABLED(CONFIG_NET_DSA)
-- 
1.9.3 (Apple Git-50)
```