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Date: Sat, 4 Aug 2018 22:00:22 +0200 From: Daniel Borkmann <daniel@...earbox.net> To: Jakub Kicinski <jakub.kicinski@...ronome.com>, alexei.starovoitov@...il.com Cc: netdev@...r.kernel.org, oss-drivers@...ronome.com Subject: Re: [PATCH bpf-next] nfp: bpf: xdp_adjust_tail support On 08/04/2018 07:06 AM, Jakub Kicinski wrote: > Add support for adjust_tail. There are no FW changes needed but add > a FW capability just in case there would be any issue with previously > released FW, or we will have to change the ABI in the future. > > The helper is trivial and shouldn't be used too often so just inline > the body of the function. We add the delta to locally maintained > packet length register and check for overflow, since add of negative > value must overflow if result is positive. Note that if delta of 0 > would be allowed in the kernel this trick stops working and we need > one more instruction to compare lengths before and after the change. > > Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com> > Reviewed-by: Quentin Monnet <quentin.monnet@...ronome.com> Applied to bpf-next, thanks Jakub!
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