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/* SPDX-License-Identifier: GPL-2.0-only
* Copyright (c) 2013-2019, 2021 The Linux Foundation. All rights reserved.
*/
#ifndef _LINUX_IF_RMNET_H_
#define _LINUX_IF_RMNET_H_
#include <linux/types.h>
struct rmnet_map_header {
u8 flags; /* MAP_CMD_FLAG, MAP_PAD_LEN_MASK */
u8 mux_id;
__be16 pkt_len; /* Length of packet, including pad */
} __aligned(1);
/* rmnet_map_header flags field:
* PAD_LEN: number of pad bytes following packet data
* CMD: 1 = packet contains a MAP command; 0 = packet contains data
* NEXT_HEADER: 1 = packet contains V5 CSUM header 0 = no V5 CSUM header
*/
#define MAP_PAD_LEN_MASK GENMASK(5, 0)
#define MAP_NEXT_HEADER_FLAG BIT(6)
#define MAP_CMD_FLAG BIT(7)
struct rmnet_map_dl_csum_trailer {
u8 reserved1;
u8 flags; /* MAP_CSUM_DL_VALID_FLAG */
__be16 csum_start_offset;
__be16 csum_length;
__sum16 csum_value;
} __aligned(1);
/* rmnet_map_dl_csum_trailer flags field:
* VALID: 1 = checksum and length valid; 0 = ignore them
*/
#define MAP_CSUM_DL_VALID_FLAG BIT(0)
struct rmnet_map_ul_csum_header {
__be16 csum_start_offset;
__be16 csum_info; /* MAP_CSUM_UL_* */
} __aligned(1);
/* csum_info field:
* OFFSET: where (offset in bytes) to insert computed checksum
* UDP: 1 = UDP checksum (zero checkum means no checksum)
* ENABLED: 1 = checksum computation requested
*/
#define MAP_CSUM_UL_OFFSET_MASK GENMASK(13, 0)
#define MAP_CSUM_UL_UDP_FLAG BIT(14)
#define MAP_CSUM_UL_ENABLED_FLAG BIT(15)
/* MAP CSUM headers */
struct rmnet_map_v5_csum_header {
u8 header_info;
u8 csum_info;
__be16 reserved;
} __aligned(1);
/* v5 header_info field
* NEXT_HEADER: represents whether there is any next header
* HEADER_TYPE: represents the type of this header
*
* csum_info field
* CSUM_VALID_OR_REQ:
* 1 = for UL, checksum computation is requested.
* 1 = for DL, validated the checksum and has found it valid
*/
#define MAPV5_HDRINFO_NXT_HDR_FLAG BIT(0)
#define MAPV5_HDRINFO_HDR_TYPE_FMASK GENMASK(7, 1)
#define MAPV5_CSUMINFO_VALID_FLAG BIT(7)
#define RMNET_MAP_HEADER_TYPE_CSUM_OFFLOAD 2
#endif /* !(_LINUX_IF_RMNET_H_) */
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