netdev - Re: [PATCH v22 bpf-next 12/23] bpf: add multi-frags support to the bpf_xdp_adjust

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Message-ID: <Yec+REpSiOLthoVx@lore-desk>
Date:   Tue, 18 Jan 2022 23:25:08 +0100
From:   Lorenzo Bianconi <lorenzo@...nel.org>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org,
        lorenzo.bianconi@...hat.com, davem@...emloft.net, kuba@...nel.org,
        ast@...nel.org, daniel@...earbox.net, shayagr@...zon.com,
        john.fastabend@...il.com, dsahern@...nel.org, brouer@...hat.com,
        echaudro@...hat.com, jasowang@...hat.com,
        alexander.duyck@...il.com, saeed@...nel.org,
        maciej.fijalkowski@...el.com, magnus.karlsson@...el.com,
        tirthendu.sarkar@...el.com, toke@...hat.com
Subject: Re: [PATCH v22 bpf-next 12/23] bpf: add multi-frags support to the
 bpf_xdp_adjust_tail() API

> On Mon, Jan 17, 2022 at 06:28:24PM +0100, Lorenzo Bianconi wrote:
> >  BPF_CALL_2(bpf_xdp_adjust_tail, struct xdp_buff *, xdp, int, offset)
> >  {
> >  	void *data_hard_end = xdp_data_hard_end(xdp); /* use xdp->frame_sz */
> >  	void *data_end = xdp->data_end + offset;
> >  
> > +	if (unlikely(xdp_buff_has_frags(xdp))) { /* xdp multi-frags */
> > +		if (offset < 0)
> > +			return bpf_xdp_multi_frags_shrink_tail(xdp, -offset);
> > +
> > +		return bpf_xdp_multi_frags_increase_tail(xdp, offset);
> > +	}
> 
> "multi frags" isn't quite correct here and in other places.
> It sounds like watery water.
> Saying "xdp frags" is enough to explain that xdp has fragments.
> Either multiple fragments or just one fragment doesn't matter.
> I think it would be cleaner to drop "multi".

ack, I will fix it.

Regards,
Lorenzo

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