linux-kernel - Re: [PATCH net-next v1 1/6] lan743x: boost performance on cpu archs w/o dma cache snooping

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Date:   Sat, 30 Jan 2021 18:59:50 -0500
From:   Sven Van Asbroeck <thesven73@...il.com>
To:     Bryan Whitehead <Bryan.Whitehead@...rochip.com>
Cc:     Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, Andrew Lunn <andrew@...n.ch>,
        Alexey Denisov <rtgbnm@...il.com>,
        Sergej Bauer <sbauer@...ckbox.su>,
        Tim Harvey <tharvey@...eworks.com>,
        Anders Rønningen <anders@...ningen.priv.no>,
        netdev <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next v1 1/6] lan743x: boost performance on cpu archs
 w/o dma cache snooping

Hi Bryan, thank you so much for reviewing, I really appreciate it.

On Sat, Jan 30, 2021 at 5:11 PM <Bryan.Whitehead@...rochip.com> wrote:
>
> >                         /* unmap from dma */
> > +                       packet_length = RX_DESC_DATA0_FRAME_LENGTH_GET_
> > +                                       (descriptor->data0);
> It appears you moved this packet_length assignment from just below the following if block, however  you left out the le32_to_cpu.See next comment
>

Correct on both counts. This is a merge snafu that crept in when I
rebased to Alexey's very recent little/big endian patch, at the last
minute.
My tests didn't catch it, because I'm running on a little-endian cpu,
where le32_to_cpu() compiles to a nop.

Had I had the good sense to run sparse on every patch, like Jakub has,
I would have caught it...