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authorBen Chan <benchan@chromium.org>2014-03-19 14:00:06 -0700
committerDavid S. Miller <davem@davemloft.net>2014-03-20 16:57:35 -0400
commit259fef033ffe4e70bf7f358c53400a09f1b5384e (patch)
tree2c972b7f21f84be2ea4ba8afa319ffc700f2ccf1 /include/linux/usb
parentbfe9b3f8c5229e5de4fd18e941866bc410d16334 (diff)
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net: cdc_ncm: respect operator preferred MTU reported by MBIM
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>
Diffstat (limited to 'include/linux/usb')
-rw-r--r--include/linux/usb/cdc_ncm.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/usb/cdc_ncm.h b/include/linux/usb/cdc_ncm.h
index c3fa80745996..bdf05fb36729 100644
--- a/include/linux/usb/cdc_ncm.h
+++ b/include/linux/usb/cdc_ncm.h
@@ -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;