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The CDC Mobile Broadband Interface Model (MBIM) specification extends CDC NCM by - removing the redundant ethernet header from the point-to-point USB channel - adding support for multiple IP (v4 and/or v6) sessions multiplexed on the same USB channel - adding a MBIM control channel encapsulated in CDC - adding Device Service Streams (DSS), which are non IP generic data streams multiplexed on the same USB channel as the IP sessions MBIM devices are managed using the dedicated control channel, and no data will flow on the data channel until a control session has been established. This driver has no knowledge of MBIM control messages. It just exports the control channel to a /dev/cdc-wdmX character device for userspace management applications. Such an application is therefore required to use this driver. This patch implements basic MBIM support, reusing the NCM and WDM driver APIs, currently limited to IP sessions with SessionID 0. DSS and multiplexed IP sessions are not yet supported. Signed-off-by: Greg Suarez <gsuarez@smithmicro.com> Signed-off-by: Bjørn Mork <bjorn@mork.no> Signed-off-by: David S. Miller <davem@davemloft.net>
135 lines
4.9 KiB
C
135 lines
4.9 KiB
C
/*
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* Copyright (C) ST-Ericsson 2010-2012
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* Contact: Alexey Orishko <alexey.orishko@stericsson.com>
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* Original author: Hans Petter Selasky <hans.petter.selasky@stericsson.com>
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*
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* USB Host Driver for Network Control Model (NCM)
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* http://www.usb.org/developers/devclass_docs/NCM10.zip
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*
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* The NCM encoding, decoding and initialization logic
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* derives from FreeBSD 8.x. if_cdce.c and if_cdcereg.h
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose this file to be licensed under the terms
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* of the GNU General Public License (GPL) Version 2 or the 2-clause
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* BSD license listed below:
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#define CDC_NCM_COMM_ALTSETTING_NCM 0
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#define CDC_NCM_COMM_ALTSETTING_MBIM 1
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#define CDC_NCM_DATA_ALTSETTING_NCM 1
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#define CDC_NCM_DATA_ALTSETTING_MBIM 2
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/* CDC NCM subclass 3.2.1 */
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#define USB_CDC_NCM_NDP16_LENGTH_MIN 0x10
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/* Maximum NTB length */
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#define CDC_NCM_NTB_MAX_SIZE_TX 32768 /* bytes */
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#define CDC_NCM_NTB_MAX_SIZE_RX 32768 /* bytes */
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/* Minimum value for MaxDatagramSize, ch. 6.2.9 */
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#define CDC_NCM_MIN_DATAGRAM_SIZE 1514 /* bytes */
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/* Minimum value for MaxDatagramSize, ch. 8.1.3 */
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#define CDC_MBIM_MIN_DATAGRAM_SIZE 2048 /* bytes */
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#define CDC_NCM_MIN_TX_PKT 512 /* bytes */
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/* Default value for MaxDatagramSize */
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#define CDC_NCM_MAX_DATAGRAM_SIZE 8192 /* bytes */
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/*
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* Maximum amount of datagrams in NCM Datagram Pointer Table, not counting
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* the last NULL entry.
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*/
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#define CDC_NCM_DPT_DATAGRAMS_MAX 40
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/* Restart the timer, if amount of datagrams is less than given value */
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#define CDC_NCM_RESTART_TIMER_DATAGRAM_CNT 3
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#define CDC_NCM_TIMER_PENDING_CNT 2
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#define CDC_NCM_TIMER_INTERVAL (400UL * NSEC_PER_USEC)
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/* The following macro defines the minimum header space */
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#define CDC_NCM_MIN_HDR_SIZE \
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(sizeof(struct usb_cdc_ncm_nth16) + sizeof(struct usb_cdc_ncm_ndp16) + \
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(CDC_NCM_DPT_DATAGRAMS_MAX + 1) * sizeof(struct usb_cdc_ncm_dpe16))
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#define CDC_NCM_NDP_SIZE \
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(sizeof(struct usb_cdc_ncm_ndp16) + \
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(CDC_NCM_DPT_DATAGRAMS_MAX + 1) * sizeof(struct usb_cdc_ncm_dpe16))
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#define cdc_ncm_comm_intf_is_mbim(x) ((x)->desc.bInterfaceSubClass == USB_CDC_SUBCLASS_MBIM && \
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(x)->desc.bInterfaceProtocol == USB_CDC_PROTO_NONE)
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#define cdc_ncm_data_intf_is_mbim(x) ((x)->desc.bInterfaceProtocol == USB_CDC_MBIM_PROTO_NTB)
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struct cdc_ncm_ctx {
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struct usb_cdc_ncm_ntb_parameters ncm_parm;
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struct hrtimer tx_timer;
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struct tasklet_struct bh;
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const struct usb_cdc_ncm_desc *func_desc;
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const struct usb_cdc_mbim_desc *mbim_desc;
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const struct usb_cdc_header_desc *header_desc;
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const struct usb_cdc_union_desc *union_desc;
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const struct usb_cdc_ether_desc *ether_desc;
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struct net_device *netdev;
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struct usb_device *udev;
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struct usb_host_endpoint *in_ep;
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struct usb_host_endpoint *out_ep;
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struct usb_host_endpoint *status_ep;
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struct usb_interface *intf;
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struct usb_interface *control;
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struct usb_interface *data;
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struct sk_buff *tx_curr_skb;
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struct sk_buff *tx_rem_skb;
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__le32 tx_rem_sign;
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spinlock_t mtx;
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atomic_t stop;
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u32 tx_timer_pending;
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u32 tx_curr_frame_num;
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u32 rx_speed;
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u32 tx_speed;
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u32 rx_max;
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u32 tx_max;
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u32 max_datagram_size;
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u16 tx_max_datagrams;
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u16 tx_remainder;
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u16 tx_modulus;
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u16 tx_ndp_modulus;
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u16 tx_seq;
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u16 rx_seq;
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u16 connected;
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};
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extern int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_altsetting);
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extern void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf);
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extern struct sk_buff *cdc_ncm_fill_tx_frame(struct cdc_ncm_ctx *ctx, struct sk_buff *skb, __le32 sign);
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extern int cdc_ncm_rx_verify_nth16(struct cdc_ncm_ctx *ctx, struct sk_buff *skb_in);
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extern int cdc_ncm_rx_verify_ndp16(struct sk_buff *skb_in, int ndpoffset);
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