From: Dan Williams <dcbw@redhat.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: DTML <devicetree@vger.kernel.org>,
syadagir@codeaurora.org, Eric Caruso <ejcaruso@google.com>,
Networking <netdev@vger.kernel.org>,
linux-arm-msm@vger.kernel.org,
Ilias Apalodimas <ilias.apalodimas@linaro.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
evgreen@chromium.org,
Bjorn Andersson <bjorn.andersson@linaro.org>,
abhishek.esse@gmail.com,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
Alex Elder <elder@linaro.org>,
Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>,
linux-soc@vger.kernel.org, David Miller <davem@davemloft.net>,
cpratapa@codeaurora.org, Ben Chan <benchan@google.com>
Subject: Re: [PATCH v2 00/17] net: introduce Qualcomm IPA driver
Date: Tue, 04 Jun 2019 16:29:26 -0500 [thread overview]
Message-ID: <0264d7f9a35430201a89c068bb13c84c622af11a.camel@redhat.com> (raw)
In-Reply-To: <CAK8P3a3pQpSpH4q=CL6gr_YzjYgoyD6-eyiLrvnZsqqjpcRxtQ@mail.gmail.com>
On Tue, 2019-06-04 at 22:04 +0200, Arnd Bergmann wrote:
> On Tue, Jun 4, 2019 at 5:18 PM Dan Williams <dcbw@redhat.com> wrote:
> > On Tue, 2019-06-04 at 10:13 +0200, Arnd Bergmann wrote:
> > > Can you describe what kind of multiplexing is actually going on?
> > > I'm still unclear about what we actually use multiple logical
> > > interfaces for here, and how they relate to one another.
> >
> > Each logical interface represents a different "connection" (PDP/EPS
> > context) to the provider network with a distinct IP address and
> > QoS.
> > VLANs may be a suitable analogy but here they are L3+QoS.
> >
> > In realistic example the main interface (say rmnet0) would be used
> > for
> > web browsing and have best-effort QoS. A second interface (say
> > rmnet1)
> > would be used for VOIP and have certain QoS guarantees from both
> > the
> > modem and the network itself.
> >
> > QMAP can also aggregate frames for a given channel
> > (connection/EPS/PDP
> > context/rmnet interface/etc) to better support LTE speeds.
>
> Thanks, that's a very helpful explanation!
>
> Is it correct to say then that the concept of having those separate
> connections would be required for any proper LTE modem
> implementation,
> but the QMAP protocol (and based on that, the rmnet implementation)
> is Qualcomm specific and shared only among several generations of
> modems from that one vendor?
Exactly correct. This is what Johannes is discussing in his "cellular
modem APIs - take 2" thread about how this should all be organized at
the driver level and I think we should figure that out before we commit
to IPA-with-a-useless-netdev that requires rmnets to be created on top.
That may end up being the solution but let's have that discussion.
> > You mentioned the need to have a common user space interface
> for configuration, and if the above is true, I agree that we should
> try
> to achieve that, either by ensuring rmnet is generic enough to
> cover other vendors (and non-QMAP clients), or by creating a
> new user level interface that IPA/rmnet can be adapted to.
I would not suggest making rmnet generic; it's pretty QMAP specific
(but QMAP is spoken by many many modems both SoC, USB stick, and PCIe
minicard).
Instead, I think what Johannes is discussing is a better approach. A
kernel WWAN framework with consistent user API that
rmnet/IPA/qmi_wwan/MBIM/QMI/serial/Sierra can all implement.
That wouldn't affect the core packet processing of IPA/rmnet but
instead:
1) when/how an rmnet device actually gets created on top of the IPA (or
qmi_wwan) device
AND (one of these two)
a) whether IPA creates a netdev on probe
OR
b) whether there is some "WWAN device" kernel object which userspace
interacts with create rmnet channels on top of IPA
Dan
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next prev parent reply other threads:[~2019-06-04 21:29 UTC|newest]
Thread overview: 106+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-31 3:53 [PATCH v2 00/17] net: introduce Qualcomm IPA driver Alex Elder
2019-05-31 3:53 ` [PATCH v2 01/17] bitfield.h: add FIELD_MAX() and field_max() Alex Elder
2019-05-31 3:53 ` [PATCH v2 02/17] dt-bindings: soc: qcom: add IPA bindings Alex Elder
2019-06-10 22:08 ` Rob Herring
2019-06-11 2:11 ` Alex Elder
2019-07-03 15:09 ` Alex Elder
2019-05-31 3:53 ` [PATCH v2 03/17] soc: qcom: ipa: main code Alex Elder
2019-05-31 21:50 ` David Miller
2019-05-31 22:25 ` Alex Elder
2019-05-31 3:53 ` [PATCH v2 04/17] soc: qcom: ipa: configuration data Alex Elder
2019-05-31 3:53 ` [PATCH v2 05/17] soc: qcom: ipa: clocking, interrupts, and memory Alex Elder
2019-05-31 3:53 ` [PATCH v2 06/17] soc: qcom: ipa: GSI headers Alex Elder
2019-05-31 3:53 ` [PATCH v2 07/17] soc: qcom: ipa: the generic software interface Alex Elder
2019-05-31 3:53 ` [PATCH v2 08/17] soc: qcom: ipa: GSI transactions Alex Elder
2019-05-31 3:53 ` [PATCH v2 09/17] soc: qcom: ipa: IPA interface to GSI Alex Elder
2019-05-31 3:53 ` [PATCH v2 10/17] soc: qcom: ipa: IPA endpoints Alex Elder
2019-05-31 3:53 ` [PATCH v2 11/17] soc: qcom: ipa: immediate commands Alex Elder
2019-05-31 3:53 ` [PATCH v2 12/17] soc: qcom: ipa: IPA network device and microcontroller Alex Elder
2019-05-31 3:53 ` [PATCH v2 13/17] soc: qcom: ipa: AP/modem communications Alex Elder
2019-05-31 3:53 ` [PATCH v2 14/17] soc: qcom: ipa: support build of IPA code Alex Elder
2019-05-31 3:53 ` [PATCH v2 15/17] MAINTAINERS: add entry for the Qualcomm IPA driver Alex Elder
2019-05-31 3:53 ` [PATCH v2 16/17] arm64: dts: sdm845: add IPA information Alex Elder
2019-05-31 3:53 ` [PATCH v2 17/17] arm64: defconfig: enable build of IPA code Alex Elder
2019-05-31 14:58 ` [PATCH v2 00/17] net: introduce Qualcomm IPA driver Dan Williams
2019-05-31 16:36 ` Alex Elder
2019-05-31 19:19 ` Arnd Bergmann
2019-05-31 20:47 ` Alex Elder
2019-05-31 21:12 ` Arnd Bergmann
2019-05-31 22:08 ` Alex Elder
2019-06-07 17:43 ` Alex Elder
2019-05-31 23:33 ` Bjorn Andersson
2019-05-31 23:59 ` Subash Abhinov Kasiviswanathan
2019-06-03 10:04 ` Arnd Bergmann
2019-06-03 13:32 ` Alex Elder
2019-06-04 8:13 ` Arnd Bergmann
2019-06-04 15:18 ` Dan Williams
2019-06-04 20:04 ` Arnd Bergmann
2019-06-04 21:29 ` Dan Williams [this message]
2019-06-06 17:42 ` Alex Elder
2019-06-11 8:12 ` Johannes Berg
2019-06-11 11:56 ` Arnd Bergmann
2019-06-11 15:53 ` Dan Williams
2019-06-11 16:52 ` Subash Abhinov Kasiviswanathan
2019-06-11 17:22 ` Dan Williams
2019-06-12 8:31 ` Arnd Bergmann
2019-06-12 14:27 ` Dan Williams
2019-06-12 15:06 ` Arnd Bergmann
2019-06-17 11:42 ` Johannes Berg
2019-06-17 12:25 ` Johannes Berg
2019-06-18 15:20 ` Alex Elder
2019-06-18 18:06 ` Dan Williams
2019-06-24 16:21 ` Alex Elder
2019-06-25 14:14 ` Johannes Berg
2019-06-26 13:36 ` Alex Elder
2019-06-26 17:55 ` Johannes Berg
2019-06-18 18:48 ` Johannes Berg
2019-06-24 16:21 ` Alex Elder
2019-06-18 13:45 ` Alex Elder
2019-06-18 19:03 ` Johannes Berg
2019-06-18 20:09 ` Arnd Bergmann
2019-06-18 20:15 ` Johannes Berg
2019-06-18 20:33 ` Arnd Bergmann
2019-06-18 20:39 ` Johannes Berg
2019-06-18 21:06 ` Arnd Bergmann
2019-06-19 20:56 ` Dan Williams
2019-06-24 16:21 ` Alex Elder
2019-06-24 16:40 ` Arnd Bergmann
2019-06-25 14:19 ` Johannes Berg
2019-06-26 13:39 ` Alex Elder
2019-06-26 13:58 ` Arnd Bergmann
2019-06-26 17:48 ` Johannes Berg
2019-06-26 17:45 ` Johannes Berg
2019-06-26 13:51 ` Alex Elder
2019-06-17 11:28 ` Johannes Berg
2019-06-18 13:16 ` Alex Elder
2019-06-18 13:48 ` Arnd Bergmann
2019-06-18 19:14 ` Johannes Berg
2019-06-18 19:59 ` Arnd Bergmann
2019-06-18 20:36 ` Johannes Berg
2019-06-18 20:55 ` Arnd Bergmann
2019-06-18 21:02 ` Johannes Berg
2019-06-18 21:15 ` Subash Abhinov Kasiviswanathan
2019-06-19 12:23 ` Arnd Bergmann
2019-06-19 18:47 ` Subash Abhinov Kasiviswanathan
2019-06-20 1:25 ` Dan Williams
2019-06-24 16:21 ` Alex Elder
2019-06-17 12:14 ` Johannes Berg
2019-06-18 14:00 ` Alex Elder
2019-06-18 19:22 ` Johannes Berg
2019-06-24 16:21 ` Alex Elder
2019-06-03 14:50 ` Dan Williams
2019-06-03 14:54 ` Dan Williams
2019-06-03 15:52 ` Alex Elder
2019-06-03 16:18 ` Dan Williams
2019-06-03 19:04 ` Subash Abhinov Kasiviswanathan
2019-06-04 15:21 ` Dan Williams
2019-05-31 23:27 ` Bjorn Andersson
2019-06-10 2:44 ` Alex Elder
2019-06-20 13:41 ` [PATCH v2 05/17] soc: qcom: ipa: clocking, interrupts, and memory Hillf Danton
2019-06-24 16:30 ` WWAN Controller Framework (was IPA [PATCH v2 00/17]) Alex Elder
2019-06-24 17:06 ` Alex Elder
2019-06-25 14:34 ` Johannes Berg
2019-06-26 13:40 ` Alex Elder
2019-06-26 17:58 ` Johannes Berg
2019-06-24 19:54 ` Dan Williams
2019-06-24 21:16 ` Alex Elder
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