netdev - Re: [PATCH V3 00/18] net: ks8851: Unify KS8851 SPI and MLL drivers

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Message-ID: <189bf325-ee33-6d0f-0947-d1f343030bfb@denx.de>
Date:   Sun, 29 Mar 2020 18:15:04 +0200
From:   Marek Vasut <marex@...x.de>
To:     netdev@...r.kernel.org
Cc:     "David S . Miller" <davem@...emloft.net>,
        Lukas Wunner <lukas@...ner.de>, Petr Stetiar <ynezz@...e.cz>,
        YueHaibing <yuehaibing@...wei.com>
Subject: Re: [PATCH V3 00/18] net: ks8851: Unify KS8851 SPI and MLL drivers

On 3/28/20 1:31 AM, Marek Vasut wrote:
> The KS8851SNL/SNLI and KS8851-16MLL/MLLI/MLLU are very much the same pieces
> of silicon, except the former has an SPI interface, while the later has a
> parallel bus interface. Thus far, Linux has two separate drivers for each
> and they are diverging considerably.
> 
> This series unifies them into a single driver with small SPI and parallel
> bus specific parts. The approach here is to first separate out the SPI
> specific parts into a separate file, then add parallel bus accessors in
> another separate file and then finally remove the old parallel bus driver.
> The reason for replacing the old parallel bus driver is because the SPI
> bus driver is much higher quality.
> 
> NOTE: This series depends on "net: ks8851-ml: Fix IO operations, again"
> 
> NOTE: The performance regression on KS8851-16MLL is now fixes, the TX
>       throughput is back to ~75 Mbit/s , RX is still 50 Mbit/s .

I also managed to implement RX NAPI (see attached demo patch if you want
to measure something on the SPI variant), but the RX performance didn't
improve dramatically. It's been 52 Mbit/s, with the RX NAPI it is 56
Mbit/s, on the parallel variant.

[...]

View attachment "0001-RX-NAPI.patch" of type "text/x-patch" (7475 bytes)