xref: /linux-6.15/include/linux/usb/cdc_ncm.h (revision 5fd54ace)

// SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
/*
 * Copyright (C) ST-Ericsson 2010-2012
 * Contact: Alexey Orishko <[email protected]>
 * Original author: Hans Petter Selasky <[email protected]>
 *
 * USB Host Driver for Network Control Model (NCM)
 * http://www.usb.org/developers/devclass_docs/NCM10.zip
 *
 * The NCM encoding, decoding and initialization logic
 * derives from FreeBSD 8.x. if_cdce.c and if_cdcereg.h
 *
 * This software is available to you under a choice of one of two
 * licenses. You may choose this file to be licensed under the terms
 * of the GNU General Public License (GPL) Version 2 or the 2-clause
 * BSD license listed below:
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef __LINUX_USB_CDC_NCM_H
#define __LINUX_USB_CDC_NCM_H

#define CDC_NCM_COMM_ALTSETTING_NCM		0
#define CDC_NCM_COMM_ALTSETTING_MBIM		1

#define CDC_NCM_DATA_ALTSETTING_NCM		1
#define CDC_NCM_DATA_ALTSETTING_MBIM		2

/* CDC NCM subclass 3.2.1 */
#define USB_CDC_NCM_NDP16_LENGTH_MIN		0x10

/* Maximum NTB length */
#define	CDC_NCM_NTB_MAX_SIZE_TX			32768	/* bytes */
#define	CDC_NCM_NTB_MAX_SIZE_RX			32768	/* bytes */

/* Initial NTB length */
#define	CDC_NCM_NTB_DEF_SIZE_TX			16384	/* bytes */
#define	CDC_NCM_NTB_DEF_SIZE_RX			16384	/* bytes */

/* Minimum value for MaxDatagramSize, ch. 6.2.9 */
#define	CDC_NCM_MIN_DATAGRAM_SIZE		1514	/* bytes */

/* Minimum value for MaxDatagramSize, ch. 8.1.3 */
#define CDC_MBIM_MIN_DATAGRAM_SIZE		2048	/* bytes */

#define	CDC_NCM_MIN_TX_PKT			512	/* bytes */

/* Default value for MaxDatagramSize */
#define	CDC_NCM_MAX_DATAGRAM_SIZE		8192	/* bytes */

/*
 * Maximum amount of datagrams in NCM Datagram Pointer Table, not counting
 * the last NULL entry.
 */
#define	CDC_NCM_DPT_DATAGRAMS_MAX		40

/* Restart the timer, if amount of datagrams is less than given value */
#define	CDC_NCM_RESTART_TIMER_DATAGRAM_CNT	3
#define	CDC_NCM_TIMER_PENDING_CNT		2
#define CDC_NCM_TIMER_INTERVAL_USEC		400UL
#define CDC_NCM_TIMER_INTERVAL_MIN		5UL
#define CDC_NCM_TIMER_INTERVAL_MAX		(U32_MAX / NSEC_PER_USEC)

/* Driver flags */
#define CDC_NCM_FLAG_NDP_TO_END			0x02	/* NDP is placed at end of frame */
#define CDC_MBIM_FLAG_AVOID_ALTSETTING_TOGGLE	0x04	/* Avoid altsetting toggle during init */
#define CDC_NCM_FLAG_RESET_NTB16 0x08	/* set NDP16 one more time after altsetting switch */

#define cdc_ncm_comm_intf_is_mbim(x)  ((x)->desc.bInterfaceSubClass == USB_CDC_SUBCLASS_MBIM && \
				       (x)->desc.bInterfaceProtocol == USB_CDC_PROTO_NONE)
#define cdc_ncm_data_intf_is_mbim(x)  ((x)->desc.bInterfaceProtocol == USB_CDC_MBIM_PROTO_NTB)

struct cdc_ncm_ctx {
	struct usb_cdc_ncm_ntb_parameters ncm_parm;
	struct hrtimer tx_timer;
	struct tasklet_struct bh;

	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;
	struct usb_interface *data;

	struct sk_buff *tx_curr_skb;
	struct sk_buff *tx_rem_skb;
	__le32 tx_rem_sign;

	spinlock_t mtx;
	atomic_t stop;
	int drvflags;

	u32 timer_interval;
	u32 max_ndp_size;
	struct usb_cdc_ncm_ndp16 *delayed_ndp16;

	u32 tx_timer_pending;
	u32 tx_curr_frame_num;
	u32 rx_max;
	u32 tx_max;
	u32 tx_curr_size;
	u32 tx_low_mem_max_cnt;
	u32 tx_low_mem_val;
	u32 max_datagram_size;
	u16 tx_max_datagrams;
	u16 tx_remainder;
	u16 tx_modulus;
	u16 tx_ndp_modulus;
	u16 tx_seq;
	u16 rx_seq;
	u16 min_tx_pkt;

	/* statistics */
	u32 tx_curr_frame_payload;
	u32 tx_reason_ntb_full;
	u32 tx_reason_ndp_full;
	u32 tx_reason_timeout;
	u32 tx_reason_max_datagram;
	u64 tx_overhead;
	u64 tx_ntbs;
	u64 rx_overhead;
	u64 rx_ntbs;
};

u8 cdc_ncm_select_altsetting(struct usb_interface *intf);
int cdc_ncm_change_mtu(struct net_device *net, int new_mtu);
int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_altsetting, int drvflags);
void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf);
struct sk_buff *cdc_ncm_fill_tx_frame(struct usbnet *dev, struct sk_buff *skb, __le32 sign);
int cdc_ncm_rx_verify_nth16(struct cdc_ncm_ctx *ctx, struct sk_buff *skb_in);
int cdc_ncm_rx_verify_ndp16(struct sk_buff *skb_in, int ndpoffset);
struct sk_buff *
cdc_ncm_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags);
int cdc_ncm_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in);

#endif /* __LINUX_USB_CDC_NCM_H */