netdev - Re: [PATCHv3 net 1/2] fib: convert fib_nh_is_v6 and nh

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Message-ID: <ZQzuB00CJpr51C+N@Laptop-X1>
Date: Fri, 22 Sep 2023 09:29:43 +0800
From: Hangbin Liu <liuhangbin@...il.com>
To: David Ahern <dsahern@...nel.org>
Cc: netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Ido Schimmel <idosch@...dia.com>,
	Benjamin Poirier <bpoirier@...dia.com>,
	Thomas Haller <thaller@...hat.com>,
	Stephen Hemminger <stephen@...workplumber.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Nicolas Dichtel <nicolas.dichtel@...nd.com>,
	Ido Schimmel <idosch@...sch.org>
Subject: Re: [PATCHv3 net 1/2] fib: convert fib_nh_is_v6 and nh_updated to
 use a single bit

On Thu, Sep 21, 2023 at 07:03:20AM -0600, David Ahern wrote:
> On 9/20/23 9:14 PM, Hangbin Liu wrote:
> > The FIB info structure currently looks like this:
> > struct fib_info {
> >         struct hlist_node          fib_hash;             /*     0    16 */
> >         [...]
> >         u32                        fib_priority;         /*    80     4 */
> > 
> >         /* XXX 4 bytes hole, try to pack */
> > 
> >         struct dst_metrics *       fib_metrics;          /*    88     8 */
> >         int                        fib_nhs;              /*    96     4 */
> >         bool                       fib_nh_is_v6;         /*   100     1 */
> >         bool                       nh_updated;           /*   101     1 */
> > 
> >         /* XXX 2 bytes hole, try to pack */
> 
> 2B hole here and you want to add a single flag so another bool. I would
> prefer the delay to a bitfield until all holes are consumed.
> 

OK, just in case I didn't misunderstand. I should add a `bool pfsrc_removed`
here and drop the first patch, right?

Thanks
Hangbin