Subject: Re: [PATCHv12 bpf-next 1/6] bpf: run devmap xdp_prog on flush instead of bulk enqueue

From: Hangbin Liu <[email-masked]>
Date: Fri, 18 Dec 2020 17:43:02 +0800

Hi David,

Thanks for the comment.

On Thu, Dec 17, 2020 at 09:07:03AM -0700, David Ahern wrote:
> > +	return n - nframes; /* dropped frames count */
> 
> just return nframes here, since ...
> 
> > +		xdp_drop = dev_map_bpf_prog_run(bq->xdp_prog, bq->q, cnt, dev);
> > +		cnt -= xdp_drop;
> 
> ... that is apparently what you really want.

I will fix this

> > +	if (dst && dst->xdp_prog && !bq->xdp_prog)
> > +		bq->xdp_prog = dst->xdp_prog;
> 
> 
> if you pass in xdp_prog through __xdp_enqueue you can reduce that to just:
> 
> 	if (!bq->xdp_prog)
> 		bq->xdp_prog = xdp_prog;

And this in the next PATCH version.

Thanks
Hangbin