netdev - Re: [PATCH net-next v3 2/5] vxlan: Expose helper vxlan_build_gbp

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Date:   Tue, 21 Feb 2023 08:38:17 +0100
From:   Paolo Abeni <pabeni@...hat.com>
To:     Jakub Kicinski <kuba@...nel.org>,
        Simon Horman <simon.horman@...igine.com>
Cc:     Gavin Li <gavinl@...dia.com>, davem@...emloft.net,
        edumazet@...gle.com, roopa@...dia.com,
        eng.alaamohamedsoliman.am@...il.com, bigeasy@...utronix.de,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        gavi@...dia.com, roid@...dia.com, maord@...dia.com,
        saeedm@...dia.com
Subject: Re: [PATCH net-next v3 2/5] vxlan: Expose helper vxlan_build_gbp_hdr

On Mon, 2023-02-20 at 12:30 -0800, Jakub Kicinski wrote:
> On Mon, 20 Feb 2023 11:31:59 +0100 Simon Horman wrote:
> > On Mon, Feb 20, 2023 at 03:15:20PM +0800, Gavin Li wrote:
> > > > Right. But what I was really wondering is if the definition
> > > > of the function could stay in drivers/net/vxlan/vxlan_core.c,
> > > > without being static. And have a declaration in include/net/vxlan.h  
> > > 
> > > Tried that the first time the function was called by driver code. It would
> > > introduce dependency in linking between the driver and the kernel module.
> > > 
> > > Do you think it's OK to have such dependency?  
> > 
> > IMHO, yes. But others may feel differently.
> > 
> > I do wonder if any performance overhead of a non-inline function
> > also needs to be considered.
> 
> Do you recall any details of why Hannes broke the dependency in the
> first place?

IIRC it was that was a cleanup thing, so that setup not using vxlan
does not load the module (and the related deps chain) for no reasons.

Cheers,

Paolo

> Commit b7aade15485a ("vxlan: break dependency with netdev drivers")
> Maybe we should stick to the static inline, it doesn't look too
> large/terrible?

IMHO static inline is good enough here.

Thanks,

Paolo