linux-kernel - Re: [PATCH net v1] lan743x: fix ethernet frame cutoff issue

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Message-ID: <CAGngYiUSkBA7ZG5hx-zaKVghME3kWKk_x5ZPWokuxkdzg+KDAA@mail.gmail.com>
Date:   Wed, 14 Apr 2021 09:40:37 -0400
From:   Sven Van Asbroeck <thesven73@...il.com>
To:     Julian Wiedmann <jwi@...ux.ibm.com>
Cc:     Bryan Whitehead <bryan.whitehead@...rochip.com>,
        David S Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        George McCollister <george.mccollister@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        netdev <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net v1] lan743x: fix ethernet frame cutoff issue

Hi Julian,

On Wed, Apr 14, 2021 at 9:33 AM Julian Wiedmann <jwi@...ux.ibm.com> wrote:
>
> __netdev_alloc_skb_ip_align() already reserves the NET_IP_ALIGN part.
> So when the NIC stores into the dma-mapped skb->data parts, each
> fragment will automatically have the required alignment - even when
> you only care about the first fragment's alignment.
>

That's really interesting! I'm going to try that out.