From: "Bjørn Mork" <bjorn@mork•no>
To: Enrico Mioso <mrkiko.rs@gmail•com>
Cc: youtux@gmail•com, alexxst@gmail•com, linux-usb@vger•kernel.org,
netdev@vger•kernel.org
Subject: Re: Is this 32-bit NCM?
Date: Thu, 27 Nov 2014 11:03:24 +0100 [thread overview]
Message-ID: <874mtl55ar.fsf@nemi.mork.no> (raw)
In-Reply-To: <alpine.LNX.2.03.1411271037050.9464@gmail.com> (Enrico Mioso's message of "Thu, 27 Nov 2014 10:45:59 +0100 (CET)")
Enrico Mioso <mrkiko.rs@gmail•com> writes:
> Ok - we can arrive to some ocnclusions regarding the E3272.
> First of all - the modem seems buggy enough to not be able to handle requests
> for different formats. You need to unplug and re-plug it, but this is onlyan
> impression and is reasonable.
>
> Then - the modem will accept to ndisdup the connection with
> at^ndisdup=1,1,"internet"
> but - if we use huawei_cdc_ncm + cdc_ncm we have no flow handling messages and
> the modem stops here.
> If we use the cdc_ncm 32-bit driver (modified) we get lotfs of
> ^dsflorpt
> that's how it should be.
> So I think we can say that something is changing.
> Then there's the alignment problem you mentioned in your previous reply. And
> this is hard to solve.
> could you try to help me understand where the problem is?
> I feel like we are very close to the solution but something isn't working.
> Or might be just try to change the 16 bit driver?
If you use a recent version of the driver as a basis, then you get the
CDC NCM NTB parameters in sysfs (if not, then you need to enable
debugging and look in the log for these values). For example:
bjorn@nemi:~$ grep . /sys/class/net/wwan0/cdc_ncm/*
/sys/class/net/wwan0/cdc_ncm/bmNtbFormatsSupported:0x0001
/sys/class/net/wwan0/cdc_ncm/dwNtbInMaxSize:15360
/sys/class/net/wwan0/cdc_ncm/dwNtbOutMaxSize:15360
/sys/class/net/wwan0/cdc_ncm/min_tx_pkt:13824
/sys/class/net/wwan0/cdc_ncm/rx_max:15360
/sys/class/net/wwan0/cdc_ncm/tx_max:15360
/sys/class/net/wwan0/cdc_ncm/tx_timer_usecs:400
/sys/class/net/wwan0/cdc_ncm/wNdpInAlignment:4
/sys/class/net/wwan0/cdc_ncm/wNdpInDivisor:1
/sys/class/net/wwan0/cdc_ncm/wNdpInPayloadRemainder:0
/sys/class/net/wwan0/cdc_ncm/wNdpOutAlignment:4
/sys/class/net/wwan0/cdc_ncm/wNdpOutDivisor:32
/sys/class/net/wwan0/cdc_ncm/wNdpOutPayloadRemainder:0
/sys/class/net/wwan0/cdc_ncm/wNtbOutMaxDatagrams:32
The possible problem I am thinking of is proper handling of the
wNdp*PayloadRemainder values. See section 3.3.4 "NCM Ethernet Frame
Alignment" in the spec. Which is confusing as hell, but if I understand
it correctly then we are supposed to align the start of the IP packets
(the "payload", _not_ the ethernet frame) to a whole wNdp*Divisor number
as long as the wNdp*PayloadRemainder is 0.
Bjørn
next prev parent reply other threads:[~2014-11-27 10:03 UTC|newest]
Thread overview: 83+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-26 21:51 Is this 32-bit NCM? Enrico Mioso
2014-11-27 9:16 ` Bjørn Mork
2014-11-27 9:22 ` Enrico Mioso
2014-11-27 9:45 ` Enrico Mioso
2014-11-27 10:03 ` Bjørn Mork [this message]
[not found] ` <CAPChA0cLuvRpYTYuFoi3bewqASgf_oZHSz5yQQ8JYm96dZ4-TQ@mail.gmail.com>
[not found] ` <CAPChA0cLuvRpYTYuFoi3bewqASgf_oZHSz5yQQ8JYm96dZ4-TQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-11-27 12:55 ` Enrico Mioso
2014-11-27 18:34 ` Enrico Mioso
2014-11-28 9:29 ` Bjørn Mork
2014-11-28 10:27 ` Enrico Mioso
2014-11-30 18:10 ` Enrico Mioso
2014-12-01 21:11 ` Enrico Mioso
[not found] ` <alpine.LNX.2.03.1412012202480.1301-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2014-12-01 22:02 ` Eli Britstein
2014-12-02 3:53 ` Kevin Zhu
[not found] ` <547D37CA.7050506-6C2+4RG2qWF0ubjbjo6WXg@public.gmane.org>
2014-12-02 6:32 ` Enrico Mioso
2014-12-02 6:43 ` Kevin Zhu
2014-12-02 6:49 ` Enrico Mioso
[not found] ` <alpine.LNX.2.03.1412020747360.1921-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2014-12-02 6:52 ` Kevin Zhu
2014-12-02 7:11 ` Eli Britstein
2014-12-02 7:44 ` Kevin Zhu
[not found] ` <547D6D7B.5090704-6C2+4RG2qWF0ubjbjo6WXg@public.gmane.org>
2014-12-02 7:45 ` Eli Britstein
2014-12-02 8:03 ` Kevin Zhu
2014-12-02 10:13 ` Enrico Mioso
2014-12-02 10:24 ` Enrico Mioso
2014-12-02 10:32 ` Enrico Mioso
2014-12-02 11:21 ` Bjørn Mork
2014-12-02 11:28 ` Enrico Mioso
2014-12-02 11:39 ` Enrico Mioso
2014-12-02 13:11 ` Enrico Mioso
[not found] ` <alpine.LNX.2.03.1412021410270.29633-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2014-12-02 13:37 ` Bjørn Mork
[not found] ` <87lhmqp400.fsf-lbf33ChDnrE/G1V5fR+Y7Q@public.gmane.org>
2014-12-02 13:53 ` Enrico Mioso
[not found] ` <alpine.LNX.2.03.1412021453340.7488-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2014-12-02 15:04 ` Kevin Zhu
2014-12-02 15:28 ` Enrico Mioso
[not found] ` <alpine.LNX.2.03.1412021627360.8131-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2014-12-03 5:38 ` Kevin Zhu
2014-12-03 6:00 ` Enrico Mioso
[not found] ` <alpine.LNX.2.03.1412030659001.1288-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2014-12-03 6:05 ` Kevin Zhu
[not found] ` <547EA82F.5050500-6C2+4RG2qWF0ubjbjo6WXg@public.gmane.org>
2014-12-03 6:29 ` Enrico Mioso
2014-12-04 6:31 ` Is this 32-bit NCM?y Enrico Mioso
2014-12-04 8:52 ` Kevin Zhu
2014-12-04 8:56 ` Enrico Mioso
[not found] ` <alpine.LNX.2.03.1412040955140.3516-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2014-12-04 9:01 ` Kevin Zhu
2014-12-04 9:19 ` Bjørn Mork
2014-12-04 9:26 ` Kevin Zhu
[not found] ` <548028A0.5000909-6C2+4RG2qWF0ubjbjo6WXg@public.gmane.org>
2014-12-04 9:28 ` Enrico Mioso
2014-12-04 9:55 ` Bjørn Mork
2014-12-04 9:53 ` Enrico Mioso
2014-12-04 10:02 ` Bjørn Mork
[not found] ` <547D7243.80508-6C2+4RG2qWF0ubjbjo6WXg@public.gmane.org>
2014-12-02 10:37 ` Is this 32-bit NCM? Enrico Mioso
2014-12-02 10:45 ` Enrico Mioso
2014-12-02 10:48 ` Enrico Mioso
2014-12-02 9:55 ` Enrico Mioso
2014-12-02 7:53 ` Kevin Zhu
[not found] ` <B315C8AC-3B33-406B-A728-14F8FAAAE986-6C2+4RG2qWF0ubjbjo6WXg@public.gmane.org>
2014-12-02 6:07 ` Enrico Mioso
2014-12-02 6:12 ` Enrico Mioso
2014-11-28 5:59 ` Enrico Mioso
2014-11-27 13:05 ` Enrico Mioso
2014-11-27 18:38 ` Enrico Mioso
2014-11-28 6:23 ` Enrico Mioso
[not found] ` <54781523.6030600@audiocodes.com>
2014-11-28 6:40 ` Enrico Mioso
2014-11-28 8:17 ` Enrico Mioso
2014-11-28 8:23 ` Kevin Zhu
2014-11-28 8:39 ` Enrico Mioso
2014-11-28 8:24 ` Enrico Mioso
2014-11-28 8:37 ` Kevin Zhu
[not found] ` <54783443.50700-6C2+4RG2qWF0ubjbjo6WXg@public.gmane.org>
2014-11-28 8:42 ` Enrico Mioso
2014-11-28 8:46 ` Kevin Zhu
2014-11-28 8:46 ` Kevin Zhu
2014-11-28 8:45 ` Enrico Mioso
2014-11-28 9:02 ` Kevin Zhu
2014-11-28 9:17 ` Enrico Mioso
2014-11-28 9:23 ` Kevin Zhu
[not found] ` <54783F18.1070709-6C2+4RG2qWF0ubjbjo6WXg@public.gmane.org>
2014-12-01 16:54 ` Enrico Mioso
2014-11-28 9:25 ` Kevin Zhu
[not found] ` <54783F84.20105-6C2+4RG2qWF0ubjbjo6WXg@public.gmane.org>
2014-11-30 1:13 ` Enrico Mioso
[not found] ` <CAPChA0czA3vxPZdwk-SgO1Wr83zOV1UoWcL4=05qtBktwq5=TA@mail.gmail.com>
2014-11-30 10:18 ` Enrico Mioso
2014-12-01 2:51 ` Kevin Zhu
2014-11-30 10:31 ` Enrico Mioso
2014-11-30 10:32 ` Enrico Mioso
2014-11-30 10:39 ` Enrico Mioso
[not found] ` <547BDCF5.8070705@audiocodes.com>
2014-12-01 5:28 ` Enrico Mioso
2014-12-01 5:51 ` Kevin Zhu
2014-12-01 16:11 ` Enrico Mioso
2014-11-30 18:36 ` Enrico Mioso
[not found] ` <alpine.LNX.2.03.1411301931280.2605-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2014-12-01 2:31 ` Kevin Zhu
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