netdev - Re: [PATCH v2 bpf-next 3/8] cpumap: formalize map value as a named struct

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Message-ID: <20200622115007.GB14425@localhost.localdomain>
Date:   Mon, 22 Jun 2020 13:50:07 +0200
From:   Lorenzo Bianconi <lorenzo@...nel.org>
To:     Jesper Dangaard Brouer <brouer@...hat.com>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org, davem@...emloft.net,
        ast@...nel.org, daniel@...earbox.net, toke@...hat.com,
        lorenzo.bianconi@...hat.com, dsahern@...nel.org
Subject: Re: [PATCH v2 bpf-next 3/8] cpumap: formalize map value as a named
 struct

> On Sat, 20 Jun 2020 00:57:19 +0200
> Lorenzo Bianconi <lorenzo@...nel.org> wrote:
> 
> > As it has been already done for devmap, introduce 'struct bpf_cpumap_val'
> > to formalize the expected values that can be passed in for a CPUMAP.
> > Update cpumap code to use the struct.
> > 
> > Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
> > ---
> >  include/uapi/linux/bpf.h       |  9 +++++++++
> >  kernel/bpf/cpumap.c            | 25 +++++++++++++------------
> >  tools/include/uapi/linux/bpf.h |  9 +++++++++
> >  3 files changed, 31 insertions(+), 12 deletions(-)
> > 
> > diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
> > index 19684813faae..a45d61bc886e 100644
> > --- a/include/uapi/linux/bpf.h
> > +++ b/include/uapi/linux/bpf.h
> > @@ -3774,6 +3774,15 @@ struct bpf_devmap_val {
> >  	} bpf_prog;
> >  };
> >  
> > +/* CPUMAP map-value layout
> > + *
> > + * The struct data-layout of map-value is a configuration interface.
> > + * New members can only be added to the end of this structure.
> > + */
> > +struct bpf_cpumap_val {
> > +	__u32 qsize;	/* queue size */
> > +};
> > +
> 
> Nitpicking the comment: /* queue size */
> It doesn't provide much information to the end-user.
> 
> What about changing it to: /* queue size to remote target CPU */

Yes, I agree. I will fix it in v3.

Regards,
Lorenzo

> ?
> 
> -- 
> Best regards,
>   Jesper Dangaard Brouer
>   MSc.CS, Principal Kernel Engineer at Red Hat
>   LinkedIn: http://www.linkedin.com/in/brouer
> 

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