1/* SPDX-License-Identifier: GPL-2.0-only
2 * Copyright (c) 2013-2019, 2021 The Linux Foundation. All rights reserved.
3 */
4
5#ifndef _LINUX_IF_RMNET_H_
6#define _LINUX_IF_RMNET_H_
7
8#include <linux/types.h>
9
10struct rmnet_map_header {
11	u8 flags;			/* MAP_CMD_FLAG, MAP_PAD_LEN_MASK */
12	u8 mux_id;
13	__be16 pkt_len;			/* Length of packet, including pad */
14}  __aligned(1);
15
16/* rmnet_map_header flags field:
17 *  PAD_LEN:	  number of pad bytes following packet data
18 *  CMD:	  1 = packet contains a MAP command; 0 = packet contains data
19 *  NEXT_HEADER: 1 = packet contains V5 CSUM header 0 = no V5 CSUM header
20 */
21#define MAP_PAD_LEN_MASK		GENMASK(5, 0)
22#define MAP_NEXT_HEADER_FLAG		BIT(6)
23#define MAP_CMD_FLAG			BIT(7)
24
25struct rmnet_map_dl_csum_trailer {
26	u8 reserved1;
27	u8 flags;			/* MAP_CSUM_DL_VALID_FLAG */
28	__be16 csum_start_offset;
29	__be16 csum_length;
30	__sum16 csum_value;
31} __aligned(1);
32
33/* rmnet_map_dl_csum_trailer flags field:
34 *  VALID:	1 = checksum and length valid; 0 = ignore them
35 */
36#define MAP_CSUM_DL_VALID_FLAG		BIT(0)
37
38struct rmnet_map_ul_csum_header {
39	__be16 csum_start_offset;
40	__be16 csum_info;		/* MAP_CSUM_UL_* */
41} __aligned(1);
42
43/* csum_info field:
44 *  OFFSET:	where (offset in bytes) to insert computed checksum
45 *  UDP:	1 = UDP checksum (zero checkum means no checksum)
46 *  ENABLED:	1 = checksum computation requested
47 */
48#define MAP_CSUM_UL_OFFSET_MASK		GENMASK(13, 0)
49#define MAP_CSUM_UL_UDP_FLAG		BIT(14)
50#define MAP_CSUM_UL_ENABLED_FLAG	BIT(15)
51
52/* MAP CSUM headers */
53struct rmnet_map_v5_csum_header {
54	u8 header_info;
55	u8 csum_info;
56	__be16 reserved;
57} __aligned(1);
58
59/* v5 header_info field
60 * NEXT_HEADER: represents whether there is any next header
61 * HEADER_TYPE: represents the type of this header
62 *
63 * csum_info field
64 * CSUM_VALID_OR_REQ:
65 * 1 = for UL, checksum computation is requested.
66 * 1 = for DL, validated the checksum and has found it valid
67 */
68
69#define MAPV5_HDRINFO_NXT_HDR_FLAG	BIT(0)
70#define MAPV5_HDRINFO_HDR_TYPE_FMASK	GENMASK(7, 1)
71#define MAPV5_CSUMINFO_VALID_FLAG	BIT(7)
72
73#define RMNET_MAP_HEADER_TYPE_CSUM_OFFLOAD 2
74#endif /* !(_LINUX_IF_RMNET_H_) */
75