netdev - Re: [PATCH net-next v10 1/4] net netlink: Add new type NLA_FLAG

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Date:   Mon, 12 Jun 2017 12:34:32 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Jamal Hadi Salim <jhs@...atatu.com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org,
        xiyou.wangcong@...il.com, eric.dumazet@...il.com,
        simon.horman@...ronome.com, mrv@...atatu.com
Subject: Re: [PATCH net-next v10 1/4] net netlink: Add new type NLA_FLAG_BITS

Sun, Jun 11, 2017 at 08:37:25PM CEST, jhs@...atatu.com wrote:
>On 17-06-11 01:38 PM, Jamal Hadi Salim wrote:
>> On 17-06-11 09:49 AM, Jiri Pirko wrote:
>> > Sun, Jun 11, 2017 at 01:53:43PM CEST, jhs@...atatu.com wrote:
>> > > From: Jamal Hadi Salim <jhs@...atatu.com>
>> 
>> 
>> > > This patch also provides an extra feature: a validation callback
>> > > that could be speaciliazed for other types.
>> > 
>> > s/speaciliazed/speciliazed/
>> > 
>> 
>> Will fix.
>> 
>> 
>> > > 
>> > > [ATTR_GOO] = { .type = MYTYPE,
>> > >            .validation_data = &myvalidation_data,
>> > >                .validate_content = mycontent_validator },
>> > 
>> > Indent is wrong. (Does not matter really in desc, but anyway)
>> > 
>> 
>> I cant find out how it got indented that way; my source
>> or email dont show it as such (but really doesnt matter).
>> 
>> 
>> > Suggested-by: Jiri Pirko <jiri@...lanox.com>
>> > 
>> 
>> Will add.
>> 
>> > 
>> > > ---
>> > > include/net/netlink.h          | 11 +++++++++++
>> > > include/uapi/linux/rtnetlink.h | 17 +++++++++++++++++
>> > > lib/nlattr.c                   | 25 +++++++++++++++++++++++++
>> > > 3 files changed, 53 insertions(+)
>> > > 
>> > > diff --git a/include/net/netlink.h b/include/net/netlink.h
>> > > index 0170917..8ab9784 100644
>> > > --- a/include/net/netlink.h
>> > > +++ b/include/net/netlink.h
>> > > @@ -6,6 +6,11 @@
>> > > #include <linux/jiffies.h>
>> > > #include <linux/in6.h>
>> > > 
>> > > +struct nla_bit_flags {
>> > > +    u32 nla_flag_values;
>> > > +    u32 nla_flag_selector;
>> > > +};
>> > 
>> > I don't understand why you redefine the struct here. You already have it
>> > defined in the uapi: struct __nla_bit_flags
>> > 
>> > Just move this (struct nla_bit_flags) to the uapi and remove
>> > __nla_bit_flags ?
>> > 
>> 
>> I am not sure that will compile since the type is defined in netlink.h
>> Also, note: uapi uses _u32 and kernel uses u32 as types i.e it is pretty
>> common approach; i will try to move it to uapi and keep that uapi
>> format. If it doesnt compile without acrobatics I will keep it as is.
>> 
>
>It doesnt compile - I could move it to linux/netlink.h but it seems
>so out of place.
>so i will keep things as is for now unless you can think of something
>else.

First of all, makes no sense to put this struct "struct __nla_bit_flags"
into rtnetlink.h uapi file. This is generic netlink stuff, not specifict
to rtnetlink.

I believe that this struct should go into:
include/uapi/linux/netlink.h

struct nla_flag_bits {
	__u32 nla_flag_bits_values;
	__u32 nla_flag_bits_selector;
};

Then you can use it from userspace and everywhere in kernel.

Btw, I find it very odd that enum containling NLA_* like NLA_U32 and
others is not part of uapi file and is rather defined in
include/net/netlink.h. Any idea why?