• Loic Poulain's avatar
    net: mhi: Add mbim proto · 163c5e62
    Loic Poulain authored
    MBIM has initially been specified by USB-IF for transporting data (IP)
    between a modem and a host over USB. However some modern modems also
    support MBIM over PCIe (via MHI). In the same way as QMAP(rmnet), it
    allows to aggregate IP packets and to perform context multiplexing.
    
    This change adds minimal MBIM data transport support to MHI, allowing
    to support MBIM only modems. MBIM being based on USB NCM, it reuses
    and copy some helpers/functions from the USB stack (cdc-ncm, cdc-mbim).
    
    Note that is a subset of the CDC-MBIM specification, supporting only
    transport of network data (IP), there is no support for DSS. Moreover
    the multi-session (for multi-pdn) is not supported in this initial
    version, but will be added latter, and aligned with the cdc-mbim
    solution (VLAN tags).
    
    This code has been inspired from the mhi_mbim downstream implementation
    (Carl Yin <carl.yin@quectel.com>).
    Signed-off-by: default avatarLoic Poulain <loic.poulain@linaro.org>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    163c5e62
proto_mbim.c 7.83 KB