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

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Message-ID: <2811b35a-9179-88ce-d87a-e1f824851494@redhat.com>
Date:   Thu, 9 Dec 2021 09:27:37 +0100
From:   Jesper Dangaard Brouer <jbrouer@...hat.com>
To:     Alexander Lobakin <alexandr.lobakin@...el.com>,
        intel-wired-lan@...ts.osuosl.org
Cc:     brouer@...hat.com, Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Björn Töpel <bjorn@...nel.org>,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
        Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>,
        Jithu Joseph <jithu.joseph@...el.com>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>,
        KP Singh <kpsingh@...nel.org>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andrii@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, bpf@...r.kernel.org
Subject: Re: [PATCH v4 net-next 2/9] i40e: respect metadata on XSK Rx to skb



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^^^^^^^^^

You have a general misspelling of this function name in all of your 
commit messages.

--Jesper