linux-kernel - Re: [PATCH net-next v3 1/6] vxlan: refactor verification and application of configuration

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Date:   Fri, 23 Jun 2017 15:31:08 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     Matthias Schiffer <mschiffer@...verse-factory.net>,
        Jiri Benc <jbenc@...hat.com>
Cc:     davem@...emloft.net, hannes@...essinduktion.org, pshelar@....org,
        aduyck@...antis.com, roopa@...ulusnetworks.com,
        netdev@...r.kernel.org, dev@...nvswitch.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v3 1/6] vxlan: refactor verification and
 application of configuration

On Fri, 2017-06-23 at 14:02 +0200, Matthias Schiffer wrote:
> 
> It seems though that rtnl_link_ops.newlink/changelink don't allow
> passing the extack yet... how do we proceed here? Treewide change
> (maybe by someone who knows their Coccinelle-fu?), or would the
> introduction of new versions of the newlink and changelink fields be
> more acceptable, so drivers can be moved to the new API one by one?

I think treewide change is easy enough, this seems to work:

@ops1@
identifier newfn, ops;
@@
static struct rtnl_link_ops ops = {
	.newlink = newfn,
...
};

@@
identifier ops1.newfn;
identifier src_net, dev, tb, data;
@@
-int newfn(struct net *src_net, struct net_device *dev,
-	   struct nlattr *tb[], struct nlattr *data[])
+int newfn(struct net *src_net, struct net_device *dev,
+	   struct nlattr *tb[], struct nlattr *data[],
+	   struct netlink_ext_ack *extack)
{...}

@ops2@
identifier chfn, ops;
@@
static struct rtnl_link_ops ops = {
	.changelink = chfn,
...
};

@@
identifier ops2.chfn;
identifier dev, tb, data;
@@
-int chfn(struct net_device *dev,
-	  struct nlattr *tb[], struct nlattr *data[])
+int chfn(struct net_device *dev,
+	  struct nlattr *tb[], struct nlattr *data[],
+	  struct netlink_ext_ack *extack)
{...}

I guess if there are any stragglers you'd find them by compile-testing
:)

johannes