linux-kernel - Re: [RFC Optimizing veth xsk performance 02/10] xsk: add dma_check

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Message-ID: <ZM1iwWnQ+derTtfS@vergenet.net>
Date:   Fri, 4 Aug 2023 22:42:41 +0200
From:   Simon Horman <horms@...nel.org>
To:     "huangjie.albert" <huangjie.albert@...edance.com>
Cc:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, 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>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        Pavel Begunkov <asml.silence@...il.com>,
        Shmulik Ladkani <shmulik.ladkani@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Richard Gobert <richardbgobert@...il.com>,
        Yunsheng Lin <linyunsheng@...wei.com>,
        "open list:NETWORKING DRIVERS" <netdev@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:XDP (eXpress Data Path)" <bpf@...r.kernel.org>
Subject: Re: [RFC Optimizing veth xsk performance 02/10] xsk: add
 dma_check_skip for  skipping dma check

On Thu, Aug 03, 2023 at 10:04:28PM +0800, huangjie.albert wrote:
> for the virtual net device such as veth, there is
> no need to do dma check if we support zero copy.
> 
> add this flag after unaligned. beacause there are 4 bytes hole

nit: beacause there are 4 bytes hole
  -> Because there is a 4 byte hole.