linux-kernel - Re: net: cdc_ncm, cdc_mbim: allow user to prefer NCM for backwards compatibility

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Message-ID: <20130516182510.GA4728@redhat.com>
Date:	Thu, 16 May 2013 14:25:10 -0400
From:	Dave Jones <davej@...hat.com>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:	Bjørn Mork <bjorn@...k.no>,
	netdev@...r.kernel.org,
	Fedora Kernel Team <kernel-team@...oraproject.org>
Subject: Re: net: cdc_ncm, cdc_mbim: allow user to prefer NCM for backwards
 compatibility

Hi Bjørn,

 > Gitweb:     http://git.kernel.org/linus/;a=commit;h=1e8bbe6cd02fc300c88bd48244ce61ad9c7d1776
 > Commit:     1e8bbe6cd02fc300c88bd48244ce61ad9c7d1776
 > Parent:     a5b8db91442fce9c9713fcd656c3698f1adde1d6
 > Author:     Bjørn Mork <bjorn@...k.no>
 > AuthorDate: Thu Mar 14 01:05:13 2013 +0000
 > Committer:  David S. Miller <davem@...emloft.net>
 > CommitDate: Sun Mar 17 11:59:03 2013 -0400
 > 
 >     net: cdc_ncm, cdc_mbim: allow user to prefer NCM for backwards compatibility
 >     
 >     commit bd329e1 ("net: cdc_ncm: do not bind to NCM compatible MBIM devices")
 >     introduced a new policy, preferring MBIM for dual NCM/MBIM functions if
 >     the cdc_mbim driver was enabled.  This caused a regression for users
 >     wanting to use NCM.
 >     
 >     Devices implementing NCM backwards compatibility according to section
 >     3.2 of the MBIM v1.0 specification allow either NCM or MBIM on a single
 >     USB function, using different altsettings.  The cdc_ncm and cdc_mbim
 >     drivers will both probe such functions, and must agree on a common
 >     policy for selecting either MBIM or NCM.  Until now, this policy has
 >     been set at build time based on CONFIG_USB_NET_CDC_MBIM.
 >     
 >     Use a module parameter to set the system policy at runtime, allowing the
 >     user to prefer NCM on systems with the cdc_mbim driver.

Is there any way we can set this automatically based on the type of device connected
and have it just work without users needing to edit modprobe.conf ?

Since this change, we've now getting reports like https://bugzilla.redhat.com/show_bug.cgi?id=963663

	Dave

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