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