net: cdc_ncm: respect operator preferred MTU reported by MBIM

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According to "Universal Serial Bus Communications Class Subclass
Specification for Mobile Broadband Interface Model, Revision 1.0,
Errata-1" published by USB-IF, the wMTU field of the MBIM extended
functional descriptor indicates the operator preferred MTU for IP data
streams.

This patch modifies cdc_ncm_setup to ensure that the MTU value set on
the usbnet device does not exceed the operator preferred MTU indicated
by wMTU if the MBIM device exposes a MBIM extended functional
descriptor.

Signed-off-by: Ben Chan <benchan@chromium.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Ben Chan 2014-03-19 14:00:06 -07:00 • committed by David S. Miller

parent bfe9b3f8c5

commit 259fef033f

2 changed files with 18 additions and 0 deletions

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17

drivers/net/usb/cdc_ncm.c

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1

include/linux/usb/cdc_ncm.h

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