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Date: Fri, 31 May 2019 09:58:58 -0500
From: Dan Williams <dcbw@...hat.com>
To: Alex Elder <elder@...aro.org>, davem@...emloft.net, arnd@...db.de,
bjorn.andersson@...aro.org, ilias.apalodimas@...aro.org
Cc: evgreen@...omium.org, benchan@...gle.com, ejcaruso@...gle.com,
cpratapa@...eaurora.org, syadagir@...eaurora.org,
subashab@...eaurora.org, abhishek.esse@...il.com,
netdev@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-soc@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v2 00/17] net: introduce Qualcomm IPA driver
On Thu, 2019-05-30 at 22:53 -0500, Alex Elder wrote:
> This series presents the driver for the Qualcomm IP Accelerator
> (IPA).
>
> This is version 2 of the series. This version has addressed almost
> all of the feedback received in the first version:
>
> https://lore.kernel.org/lkml/20190512012508.10608-1-elder@linaro.org/
> More detail is included in the individual patches, but here is a
> high-level summary of what's changed since then:
> - Two spinlocks have been removed.
> - The code for enabling and disabling endpoint interrupts has
> been simplified considerably, and the spinlock is no longer
> required
> - A spinlock used when updating ring buffer pointers is no
> longer needed. Integers indexing the ring are used instead
> (and they don't even have to be atomic).
> - One spinlock remains to protect list updates, but it is always
> acquired using spin_lock_bh() (no more irqsave).
> - Information about the queueing and completion of messages is now
> supplied to the network stack in batches rather than one at a
> time.
> - I/O completion handling has been simplified, with the IRQ
> handler now consisting mainly of disabling the interrupt and
> calling napi_schedule().
> - Some comments have been updated and improved througout.
>
> What follows is the introduction supplied with v1 of the series.
>
> -----
>
> The IPA is a component present in some Qualcomm SoCs that allows
> network functions such as aggregation, filtering, routing, and NAT
> to be performed without active involvement of the main application
> processor (AP).
>
> Initially, these advanced features are disabled; the IPA driver
> simply provides a network interface that makes the modem's LTE
> network available to the AP. In addition, only support for the
> IPA found in the Qualcomm SDM845 SoC is provided.
My question from the Nov 2018 IPA rmnet driver still stands; how does
this relate to net/ethernet/qualcomm/rmnet/ if at all? And if this is
really just a netdev talking to the IPA itself and unrelated to
net/ethernet/qualcomm/rmnet, let's call it "ipa%d" and stop cargo-
culting rmnet around just because it happens to be a net driver for a
QC SoC.
Is the firmware that the driver loads already in linux-firmware or
going to be there soon?
How does the driver support multiple PDNs (eg PDP or EPS contexts) that
are enabled through the control plane via QMI messages? I couldn't
quite find that out.
Thanks,
Dan
> This code is derived from a driver developed internally by Qualcomm.
> A version of the original source can be seen here:
> https://source.codeaurora.org/quic/la/kernel/msm-4.9/tree
> in the "drivers/platform/msm/ipa" directory. Many were involved in
> developing this, but the following individuals deserve explicit
> acknowledgement for their substantial contributions:
>
> Abhishek Choubey
> Ady Abraham
> Chaitanya Pratapa
> David Arinzon
> Ghanim Fodi
> Gidon Studinski
> Ravi Gummadidala
> Shihuan Liu
> Skylar Chang
>
> A version of this code was posted in November 2018 as an RFC.
>
> https://lore.kernel.org/lkml/20181107003250.5832-1-elder@linaro.org/
> All feedback received was addressed. The code has undergone
> considerable further rework since that time, and most of the
> "future work" described then has now been completed.
>
> This code is available in buildable form here, based on kernel
> v5.2-rc1:
> remote: ssh://git@....linaro.org/people/alex.elder/linux.git
> branch: ipa-v2_kernel-v5.2-rc2
> 75adf2ac1266 arm64: defconfig: enable build of IPA code
>
> The branch depends on a commit now found in in net-next. It has
> been cherry-picked, and (in this branch) has this commit ID:
> 13c627b5a078 net: qualcomm: rmnet: Move common struct definitions
> to include
> by
>
> -Alex
>
> Alex Elder (17):
> bitfield.h: add FIELD_MAX() and field_max()
> dt-bindings: soc: qcom: add IPA bindings
> soc: qcom: ipa: main code
> soc: qcom: ipa: configuration data
> soc: qcom: ipa: clocking, interrupts, and memory
> soc: qcom: ipa: GSI headers
> soc: qcom: ipa: the generic software interface
> soc: qcom: ipa: GSI transactions
> soc: qcom: ipa: IPA interface to GSI
> soc: qcom: ipa: IPA endpoints
> soc: qcom: ipa: immediate commands
> soc: qcom: ipa: IPA network device and microcontroller
> soc: qcom: ipa: AP/modem communications
> soc: qcom: ipa: support build of IPA code
> MAINTAINERS: add entry for the Qualcomm IPA driver
> arm64: dts: sdm845: add IPA information
> arm64: defconfig: enable build of IPA code
>
> .../devicetree/bindings/net/qcom,ipa.yaml | 180 ++
> MAINTAINERS | 6 +
> arch/arm64/boot/dts/qcom/sdm845.dtsi | 51 +
> arch/arm64/configs/defconfig | 1 +
> drivers/net/Kconfig | 2 +
> drivers/net/Makefile | 1 +
> drivers/net/ipa/Kconfig | 16 +
> drivers/net/ipa/Makefile | 7 +
> drivers/net/ipa/gsi.c | 1635
> +++++++++++++++++
> drivers/net/ipa/gsi.h | 246 +++
> drivers/net/ipa/gsi_private.h | 148 ++
> drivers/net/ipa/gsi_reg.h | 376 ++++
> drivers/net/ipa/gsi_trans.c | 624 +++++++
> drivers/net/ipa/gsi_trans.h | 116 ++
> drivers/net/ipa/ipa.h | 131 ++
> drivers/net/ipa/ipa_clock.c | 297 +++
> drivers/net/ipa/ipa_clock.h | 52 +
> drivers/net/ipa/ipa_cmd.c | 377 ++++
> drivers/net/ipa/ipa_cmd.h | 116 ++
> drivers/net/ipa/ipa_data-sdm845.c | 245 +++
> drivers/net/ipa/ipa_data.h | 267 +++
> drivers/net/ipa/ipa_endpoint.c | 1283 +++++++++++++
> drivers/net/ipa/ipa_endpoint.h | 97 +
> drivers/net/ipa/ipa_gsi.c | 48 +
> drivers/net/ipa/ipa_gsi.h | 49 +
> drivers/net/ipa/ipa_interrupt.c | 279 +++
> drivers/net/ipa/ipa_interrupt.h | 53 +
> drivers/net/ipa/ipa_main.c | 921 ++++++++++
> drivers/net/ipa/ipa_mem.c | 234 +++
> drivers/net/ipa/ipa_mem.h | 83 +
> drivers/net/ipa/ipa_netdev.c | 251 +++
> drivers/net/ipa/ipa_netdev.h | 24 +
> drivers/net/ipa/ipa_qmi.c | 402 ++++
> drivers/net/ipa/ipa_qmi.h | 35 +
> drivers/net/ipa/ipa_qmi_msg.c | 583 ++++++
> drivers/net/ipa/ipa_qmi_msg.h | 238 +++
> drivers/net/ipa/ipa_reg.h | 279 +++
> drivers/net/ipa/ipa_smp2p.c | 304 +++
> drivers/net/ipa/ipa_smp2p.h | 47 +
> drivers/net/ipa/ipa_uc.c | 208 +++
> drivers/net/ipa/ipa_uc.h | 32 +
> include/linux/bitfield.h | 14 +
> 42 files changed, 10358 insertions(+)
> create mode 100644
> Documentation/devicetree/bindings/net/qcom,ipa.yaml
> create mode 100644 drivers/net/ipa/Kconfig
> create mode 100644 drivers/net/ipa/Makefile
> create mode 100644 drivers/net/ipa/gsi.c
> create mode 100644 drivers/net/ipa/gsi.h
> create mode 100644 drivers/net/ipa/gsi_private.h
> create mode 100644 drivers/net/ipa/gsi_reg.h
> create mode 100644 drivers/net/ipa/gsi_trans.c
> create mode 100644 drivers/net/ipa/gsi_trans.h
> create mode 100644 drivers/net/ipa/ipa.h
> create mode 100644 drivers/net/ipa/ipa_clock.c
> create mode 100644 drivers/net/ipa/ipa_clock.h
> create mode 100644 drivers/net/ipa/ipa_cmd.c
> create mode 100644 drivers/net/ipa/ipa_cmd.h
> create mode 100644 drivers/net/ipa/ipa_data-sdm845.c
> create mode 100644 drivers/net/ipa/ipa_data.h
> create mode 100644 drivers/net/ipa/ipa_endpoint.c
> create mode 100644 drivers/net/ipa/ipa_endpoint.h
> create mode 100644 drivers/net/ipa/ipa_gsi.c
> create mode 100644 drivers/net/ipa/ipa_gsi.h
> create mode 100644 drivers/net/ipa/ipa_interrupt.c
> create mode 100644 drivers/net/ipa/ipa_interrupt.h
> create mode 100644 drivers/net/ipa/ipa_main.c
> create mode 100644 drivers/net/ipa/ipa_mem.c
> create mode 100644 drivers/net/ipa/ipa_mem.h
> create mode 100644 drivers/net/ipa/ipa_netdev.c
> create mode 100644 drivers/net/ipa/ipa_netdev.h
> create mode 100644 drivers/net/ipa/ipa_qmi.c
> create mode 100644 drivers/net/ipa/ipa_qmi.h
> create mode 100644 drivers/net/ipa/ipa_qmi_msg.c
> create mode 100644 drivers/net/ipa/ipa_qmi_msg.h
> create mode 100644 drivers/net/ipa/ipa_reg.h
> create mode 100644 drivers/net/ipa/ipa_smp2p.c
> create mode 100644 drivers/net/ipa/ipa_smp2p.h
> create mode 100644 drivers/net/ipa/ipa_uc.c
> create mode 100644 drivers/net/ipa/ipa_uc.h
>
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