include/linux/usb/cdc_ncm.h

   1 /*
   2  * Copyright (C) ST-Ericsson 2010-2012
   3  * Contact: Alexey Orishko <alexey.orishko@stericsson.com>
   4  * Original author: Hans Petter Selasky <hans.petter.selasky@stericsson.com>
   5  *
   6  * USB Host Driver for Network Control Model (NCM)
   7  * http://www.usb.org/developers/devclass_docs/NCM10.zip
   8  *
   9  * The NCM encoding, decoding and initialization logic
  10  * derives from FreeBSD 8.x. if_cdce.c and if_cdcereg.h
  11  *
  12  * This software is available to you under a choice of one of two
  13  * licenses. You may choose this file to be licensed under the terms
  14  * of the GNU General Public License (GPL) Version 2 or the 2-clause
  15  * BSD license listed below:
  16  *
  17  * Redistribution and use in source and binary forms, with or without
  18  * modification, are permitted provided that the following conditions
  19  * are met:
  20  * 1. Redistributions of source code must retain the above copyright
  21  *    notice, this list of conditions and the following disclaimer.
  22  * 2. Redistributions in binary form must reproduce the above copyright
  23  *    notice, this list of conditions and the following disclaimer in the
  24  *    documentation and/or other materials provided with the distribution.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  */
  38
  39 #ifndef __LINUX_USB_CDC_NCM_H
  40 #define __LINUX_USB_CDC_NCM_H
  41
  42 #define CDC_NCM_COMM_ALTSETTING_NCM             0
  43 #define CDC_NCM_COMM_ALTSETTING_MBIM            1
  44
  45 #define CDC_NCM_DATA_ALTSETTING_NCM             1
  46 #define CDC_NCM_DATA_ALTSETTING_MBIM            2
  47
  48 /* CDC NCM subclass 3.2.1 */
  49 #define USB_CDC_NCM_NDP16_LENGTH_MIN            0x10
  50
  51 /* Maximum NTB length */
  52 #define CDC_NCM_NTB_MAX_SIZE_TX                 32768   /* bytes */
  53 #define CDC_NCM_NTB_MAX_SIZE_RX                 32768   /* bytes */
  54
  55 /* Minimum value for MaxDatagramSize, ch. 6.2.9 */
  56 #define CDC_NCM_MIN_DATAGRAM_SIZE               1514    /* bytes */
  57
  58 /* Minimum value for MaxDatagramSize, ch. 8.1.3 */
  59 #define CDC_MBIM_MIN_DATAGRAM_SIZE              2048    /* bytes */
  60
  61 #define CDC_NCM_MIN_TX_PKT                      512     /* bytes */
  62
  63 /* Default value for MaxDatagramSize */
  64 #define CDC_NCM_MAX_DATAGRAM_SIZE               8192    /* bytes */
  65
  66 /*
  67  * Maximum amount of datagrams in NCM Datagram Pointer Table, not counting
  68  * the last NULL entry.
  69  */
  70 #define CDC_NCM_DPT_DATAGRAMS_MAX               40
  71
  72 /* Restart the timer, if amount of datagrams is less than given value */
  73 #define CDC_NCM_RESTART_TIMER_DATAGRAM_CNT      3
  74 #define CDC_NCM_TIMER_PENDING_CNT               2
  75 #define CDC_NCM_TIMER_INTERVAL                  (400UL * NSEC_PER_USEC)
  76
  77 /* The following macro defines the minimum header space */
  78 #define CDC_NCM_MIN_HDR_SIZE \
  79         (sizeof(struct usb_cdc_ncm_nth16) + sizeof(struct usb_cdc_ncm_ndp16) + \
  80         (CDC_NCM_DPT_DATAGRAMS_MAX + 1) * sizeof(struct usb_cdc_ncm_dpe16))
  81
  82 #define CDC_NCM_NDP_SIZE \
  83         (sizeof(struct usb_cdc_ncm_ndp16) +                             \
  84               (CDC_NCM_DPT_DATAGRAMS_MAX + 1) * sizeof(struct usb_cdc_ncm_dpe16))
  85
  86 #define cdc_ncm_comm_intf_is_mbim(x)  ((x)->desc.bInterfaceSubClass == USB_CDC_SUBCLASS_MBIM && \
  87                                        (x)->desc.bInterfaceProtocol == USB_CDC_PROTO_NONE)
  88 #define cdc_ncm_data_intf_is_mbim(x)  ((x)->desc.bInterfaceProtocol == USB_CDC_MBIM_PROTO_NTB)
  89
  90 struct cdc_ncm_ctx {
  91         struct hrtimer tx_timer;
  92         struct tasklet_struct bh;
  93
  94         const struct usb_cdc_ncm_desc *func_desc;
  95         const struct usb_cdc_mbim_desc   *mbim_desc;
  96         const struct usb_cdc_header_desc *header_desc;
  97         const struct usb_cdc_union_desc *union_desc;
  98         const struct usb_cdc_ether_desc *ether_desc;
  99
 100         struct usb_interface *control;
 101         struct usb_interface *data;
 102
 103         struct sk_buff *tx_curr_skb;
 104         struct sk_buff *tx_rem_skb;
 105         __le32 tx_rem_sign;
 106
 107         spinlock_t mtx;
 108         atomic_t stop;
 109
 110         u32 tx_timer_pending;
 111         u32 tx_curr_frame_num;
 112         u32 rx_max;
 113         u32 tx_max;
 114         u32 max_datagram_size;
 115         u16 tx_max_datagrams;
 116         u16 tx_remainder;
 117         u16 tx_modulus;
 118         u16 tx_ndp_modulus;
 119         u16 tx_seq;
 120         u16 rx_seq;
 121         u16 connected;
 122 };
 123
 124 extern u8 cdc_ncm_select_altsetting(struct usbnet *dev, struct usb_interface *intf);
 125 extern int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_altsetting);
 126 extern void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf);
 127 extern struct sk_buff *cdc_ncm_fill_tx_frame(struct usbnet *dev, struct sk_buff *skb, __le32 sign);
 128 extern int cdc_ncm_rx_verify_nth16(struct cdc_ncm_ctx *ctx, struct sk_buff *skb_in);
 129 extern int cdc_ncm_rx_verify_ndp16(struct sk_buff *skb_in, int ndpoffset);
 130
 131 #endif /* __LINUX_USB_CDC_NCM_H */