netdev - Re: [PATCH v2 1/2] net: extend drop reasons for multiple subsystems

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Date:   Fri, 14 Apr 2023 11:25:08 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v2 1/2] net: extend drop reasons for multiple subsystems

On Fri, 2023-03-31 at 21:36 -0700, Jakub Kicinski wrote:
> 
> > +/* Note: due to dynamic registrations, access must be under RCU */
> > +extern const struct drop_reason_list __rcu *
> > +drop_reasons_by_subsys[SKB_DROP_REASON_SUBSYS_NUM];
> > +
> > +void drop_reasons_register_subsys(enum skb_drop_reason_subsys subsys,
> > +				  const struct drop_reason_list *list);
> > +void drop_reasons_unregister_subsys(enum skb_drop_reason_subsys subsys);
> 
> dropreason.h is included by skbuff.h because history, but I don't think
> any of the new stuff must be visible in skbuff.h.
> 
> Could you make a new header, and put as much of this stuff there as
> possible? Our future selves will thank us for shorter rebuild times..

Sure. Not sure it'll make a big difference in rebuild, but we'll see :)

I ended up moving dropreason.h to dropreason-core.h first, that way we
also have a naming scheme for non-core dropreason files should they
become visible outside of the subsystem (i.e. mac80211 just has them
internally).

Dunno, let me know if you prefer something else, I just couldn't come up
with a non-confusing longer name for the new thing.

> Weak preference to also take the code out of skbuff.c but that's not as
> important.

I guess I can create a new dropreason.c, but is that worth it? It's only
a few lines. Let me know, then I can resend.

> You To'd both wireless and netdev, who are you expecting to apply this?
> :S

Good question :)

The first patch (patches in v3) really should go through net-next I
suppose, and I wouldn't mind if the other one did as well, it doesn't
right now touch anything likely to change.

johannes