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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>
This commit is contained in:
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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1
include/linux/usb/cdc_ncm.h
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@@ -93,6 +93,7 @@ struct cdc_ncm_ctx {
const struct usb_cdc_ncm_desc *func_desc;
const struct usb_cdc_mbim_desc *mbim_desc;
const struct usb_cdc_mbim_extended_desc *mbim_extended_desc;
const struct usb_cdc_ether_desc *ether_desc;
struct usb_interface *control;