// SPDX-License-Identifier: GPL-2.0
/*
* Networking over Thunderbolt cable using Apple ThunderboltIP protocol
*
* 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>
/* 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_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 {
u32 frame_size;
u16 frame_index;
u16 frame_id;
u32 frame_count;
};
enum thunderbolt_ip_frame_pdf {
TBIP_PDF_FRAME_START = 1,
TBIP_PDF_FRAME_END,
};
enum thunderbolt_ip_type {
TBIP_LOGIN,
TBIP_LOGIN_RESPONSE,
TBIP_LOGOUT,
TBIP_STATUS,
};
struct thunderbolt_ip_header {
u32 route_hi;
u32 route_lo;
u32 length_sn;
uuid_t uuid;
uuid_t initiator_uuid;
uuid_t target_uuid;
u32 type;
u32 command_id;
};
#define TBIP_HDR_LENGTH_MASK GENMASK(5, 0)
#define TBIP_HDR_SN_MASK GENMASK(28, 27)
#define TBIP_HDR_SN_SHIFT 27
struct thunderbolt_ip_login {
struct thunderbolt_ip_header hdr;
u32 proto_version;
u32 transmit_path;
u32 reserved[4];
};
#define TBIP_LOGIN_PROTO_VERSION 1
struct thunderbolt_ip_login_response {
struct thunderbolt_ip_header hdr;
u32 status;
u32 receiver_mac[2];
u32 receiver_mac_len;
u32 reserved[4];
};
struct thunderbolt_ip_logout {
struct thunderbolt_ip_header hdr;
};
struct thunderbolt_ip_status {
struct thunderbolt_ip_header hdr;
u32 status;
