netdev - Re: [PATCH v4 net-next 2/9] i40e: respect metadata on XSK Rx to skb

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Message-ID: <11db2426b85eb8cedd5e2d66d6399143cb382b49.camel@intel.com>
Date:   Thu, 9 Dec 2021 18:50:07 +0000
From:   "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>
To:     "Lobakin, Alexandr" <alexandr.lobakin@...el.com>,
        "jbrouer@...hat.com" <jbrouer@...hat.com>
CC:     "songliubraving@...com" <songliubraving@...com>,
        "hawk@...nel.org" <hawk@...nel.org>, "kafai@...com" <kafai@...com>,
        "andrii@...nel.org" <andrii@...nel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "Fijalkowski, Maciej" <maciej.fijalkowski@...el.com>,
        "john.fastabend@...il.com" <john.fastabend@...il.com>,
        "Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
        "kpsingh@...nel.org" <kpsingh@...nel.org>,
        "ast@...nel.org" <ast@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "brouer@...hat.com" <brouer@...hat.com>, "yhs@...com" <yhs@...com>,
        "Joseph, Jithu" <jithu.joseph@...el.com>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "bjorn@...nel.org" <bjorn@...nel.org>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "michal.swiatkowski@...ux.intel.com" 
        <michal.swiatkowski@...ux.intel.com>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>
Subject: Re: [PATCH v4 net-next 2/9] i40e: respect metadata on XSK Rx to skb

On Thu, 2021-12-09 at 18:38 +0100, Alexander Lobakin wrote:
> From: Jesper Dangaard Brouer <jbrouer@...hat.com>
> Date: Thu, 9 Dec 2021 09:27:37 +0100
> 
> > On 08/12/2021 15.06, Alexander Lobakin wrote:
> > > For now, if the XDP prog returns XDP_PASS on XSK, the metadata
> > > will
> > > be lost as it doesn't get copied to the skb.
> > 
> > I have an urge to add a newline here, when reading this, as IMHO it
> > is a 
> > paragraph with the problem statement.
> > 
> > > Copy it along with the frame headers. Account its size on skb
> > > allocation, and when copying just treat it as a part of the frame
> > > and do a pull after to "move" it to the "reserved" zone.
> > 
> > Also newline here, as next paragraph are some extra details, you
> > felt a 
> > need to explain to the reader.
> > 
> > > net_prefetch() xdp->data_meta and align the copy size to speed-up
> > > memcpy() a little and better match i40e_costruct_skb().
> >                                       ^^^^^^xx^^^^^^^^^
> > 
> > commit messages.
> 
> Oh gosh, I thought I don't have attention deficit. Thanks, maybe
> Tony will fix it for me or I could send a follow-up (or resend if
> needed, I saw those were already applied to dev-queue).

If there's no need for follow-ups beyond this change, I'll fix it up.

Thanks,
Tony

> > --Jesper
> 
> Al