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From: Arnd Bergmann <arnd@arndb.de>
To: Alex Elder <elder@linaro.org>
Cc: David Miller <davem@davemloft.net>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Ilias Apalodimas <ilias.apalodimas@linaro.org>,
	Rob Herring <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Networking <netdev@vger.kernel.org>,
	DTML <devicetree@vger.kernel.org>,
	linux-arm-msm@vger.kernel.org, linux-soc@vger.kernel.org,
	Linux ARM <linux-arm-kernel@lists.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	syadagir@codeaurora.org, mjavid@codeaurora.org
Subject: Re: [RFC PATCH 00/12] net: introduce Qualcomm IPA driver
Date: Wed, 7 Nov 2018 16:46:47 +0100
Message-ID: <CAK8P3a15nTnL0tD4TJgtPVEKFwZRcyNy=m6_Pi3+8Nd0W6FQtQ@mail.gmail.com> (raw)
In-Reply-To: <20181107003250.5832-1-elder@linaro.org>

On Wed, Nov 7, 2018 at 1:33 AM Alex Elder <elder@linaro.org> wrote:
> The code has undergone considerable rework to prepare it for
> incorporation into upstream Linux.  Parts of it bear little
> resemblance to the original driver.  Still, some work remains
> to be done.  The current code and its design had a preliminary
> review, and some changes to the data path implementation were
> recommended.   These have not yet been addressed:
> - Use NAPI for all interfaces, not just RX (and WAN data) endpoints.
> - Do more work in the NAPI poll function, including collecting
>   completed TX requests and posting buffers for RX.
> - Do not use periodic NOP requests as a way to avoid TX interrupts.
> - The NAPI context should be associated with the hardware interrupt
>   (it is now associated with something abstracted from the hardware).
> - Use threaded interrupts, to avoid the need for using spinlocks and
>   atomic variables for synchronizing between workqueue and interrupt
>   context.
> - Have runtime power management enable and disable IPA clock and
>   interconnects.
> Many thanks to Arnd Bergmann, Ilias Apalodimas, and Bjorn Andersson
> for their early feedback.

Thanks for getting the current version out even with the long TODO
list. I've had my first deeper look at some of the patches and found
a few more things that likely require substantial rework. I also think
there is still significant room for simplifying it further, and getting
better performance out of it in the process.

Also, despite the criticism in my patch review, I have to say you've
done a great job at cutting out a lot of the things that were present
in the past, it's good to see that you have come this far with the
cleanup!

      Arnd

      parent reply index

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-07  0:32 Alex Elder
2018-11-07  0:32 ` [RFC PATCH 01/12] dt-bindings: soc: qcom: add IPA bindings Alex Elder
2018-11-07 11:50   ` Arnd Bergmann
2018-11-09 22:38     ` Alex Elder
2018-11-07 14:59   ` Rob Herring
2018-11-09 22:38     ` Alex Elder
2018-11-11  1:40       ` Rob Herring
2018-11-13 16:28     ` Alex Elder
2018-11-07  0:32 ` [RFC PATCH 02/12] soc: qcom: ipa: DMA helpers Alex Elder
2018-11-07 12:17   ` Arnd Bergmann
2018-11-13 16:33     ` Alex Elder
2018-11-07  0:32 ` [RFC PATCH 03/12] soc: qcom: ipa: generic software interface Alex Elder
2018-11-07  0:32 ` [RFC PATCH 04/12] soc: qcom: ipa: immediate commands Alex Elder
2018-11-07 14:36   ` Arnd Bergmann
2018-11-13 16:58     ` Alex Elder
2018-11-07  0:32 ` [RFC PATCH 05/12] soc: qcom: ipa: IPA interrupts and the microcontroller Alex Elder
2018-11-07  0:32 ` [RFC PATCH 06/12] soc: qcom: ipa: QMI modem communication Alex Elder
2018-11-07  0:32 ` [RFC PATCH 07/12] soc: qcom: ipa: IPA register abstraction Alex Elder
2018-11-07 15:00   ` Arnd Bergmann
2018-11-15  2:48     ` Alex Elder
2018-11-15 14:42       ` Arnd Bergmann
2018-11-07  0:32 ` [RFC PATCH 08/12] soc: qcom: ipa: utility functions Alex Elder
2018-11-07  0:32 ` [RFC PATCH 09/12] soc: qcom: ipa: main IPA source file Alex Elder
2018-11-07 14:08   ` Arnd Bergmann
2018-11-15  3:11     ` Alex Elder
2018-11-07  0:32 ` [RFC PATCH 10/12] soc: qcom: ipa: data path Alex Elder
2018-11-07 14:55   ` Arnd Bergmann
2018-11-15  3:31     ` Alex Elder
2018-11-15 14:48       ` Arnd Bergmann
2018-11-07  0:32 ` [RFC PATCH 11/12] soc: qcom: ipa: IPA rmnet interface Alex Elder
2018-11-07 13:30   ` Arnd Bergmann
2018-11-07 15:26   ` Dan Williams
2018-11-07  0:32 ` [RFC PATCH 12/12] soc: qcom: ipa: build and "ipa_i.h" Alex Elder
2018-11-07  0:40   ` Randy Dunlap
2018-11-08 16:22     ` Alex Elder
2018-11-07 12:34   ` Arnd Bergmann
2018-11-07 15:46 ` Arnd Bergmann [this message]

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