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