path: root/drivers/net/thunderbolt/main.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Networking over Thunderbolt/USB4 cables using USB4NET protocol
 * (formerly Apple ThunderboltIP).
 *
 * Copyright (C) 2017, Intel Corporation
 * Authors: Amir Levy <amir.jer.levy@intel.com>
 *          Michael Jamet <michael.jamet@intel.com>
 *          Mika Westerberg <mika.westerberg@linux.intel.com>
 */

#include <linux/atomic.h>
#include <linux/highmem.h>
#include <linux/if_vlan.h>
#include <linux/jhash.h>
#include <linux/module.h>
#include <linux/etherdevice.h>
#include <linux/rtnetlink.h>
#include <linux/sizes.h>
#include <linux/thunderbolt.h>
#include <linux/uuid.h>
#include <linux/workqueue.h>

#include <net/ip6_checksum.h>

#include "trace.h"

/* Protocol timeouts in ms */
#define TBNET_LOGIN_DELAY	4500
#define TBNET_LOGIN_TIMEOUT	500
#define TBNET_LOGOUT_TIMEOUT	1000

#define TBNET_RING_SIZE		256
#define TBNET_LOGIN_RETRIES	60
#define TBNET_LOGOUT_RETRIES	10
#define TBNET_E2E		BIT(0)
#define TBNET_MATCH_FRAGS_ID	BIT(1)
#define TBNET_64K_FRAMES	BIT(2)
#define TBNET_MAX_MTU		SZ_64K
#define TBNET_FRAME_SIZE	SZ_4K
#define TBNET_MAX_PAYLOAD_SIZE	\
	(TBNET_FRAME_SIZE - sizeof(struct thunderbolt_ip_frame_header))
/* Rx packets need to hold space for skb_shared_info */
#define TBNET_RX_MAX_SIZE	\
	(TBNET_FRAME_SIZE + SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
#define TBNET_RX_PAGE_ORDER	get_order(TBNET_RX_MAX_SIZE)
#define TBNET_RX_PAGE_SIZE	(PAGE_SIZE << TBNET_RX_PAGE_ORDER)

#define TBNET_L0_PORT_NUM(route) ((route) & GENMASK(5, 0))

/**
 * struct thunderbolt_ip_frame_header - Header for each Thunderbolt frame
 * @frame_size: size of the data with the frame
 * @frame_index: running index on the frames
 * @frame_id: ID of the frame to match frames to specific packet
 * @frame_count: how many frames assembles a full packet
 *
 * Each data frame passed to the high-speed DMA ring has this header. If
 * the XDomain network directory announces that %TBNET_MATCH_FRAGS_ID is
 * supported then @frame_id is filled, otherwise it stays %0.
 */
struct thunderbolt_ip_frame_header {
	__le32 frame_size;
	__le16 frame_index;
	__le16 frame_id;
	__le32 frame_count;
};

enum thunderbolt_ip_frame_pdf {