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 10 struct 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 25 struct 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 38 struct 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 */ 53 struct 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