diff options
Diffstat (limited to 'include/linux/if_rmnet.h')
| -rw-r--r-- | include/linux/if_rmnet.h | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/include/linux/if_rmnet.h b/include/linux/if_rmnet.h new file mode 100644 index 000000000..839d1e48b --- /dev/null +++ b/include/linux/if_rmnet.h @@ -0,0 +1,74 @@ +/* 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_) */ |