include/linux/if_rmnet.h

   1 /* SPDX-License-Identifier: GPL-2.0-only
   2  * Copyright (c) 2013-2019, 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  */
  18 #define MAP_PAD_LEN_MASK                GENMASK(5, 0)
  19 #define MAP_CMD_FLAG                    BIT(7)
  20
  21 struct rmnet_map_dl_csum_trailer {
  22         u8 reserved1;
  23         u8 flags;                       /* MAP_CSUM_DL_VALID_FLAG */
  24         __be16 csum_start_offset;
  25         __be16 csum_length;
  26         __be16 csum_value;
  27 } __aligned(1);
  28
  29 /* rmnet_map_dl_csum_trailer flags field:
  30  *  VALID:      1 = checksum and length valid; 0 = ignore them
  31  */
  32 #define MAP_CSUM_DL_VALID_FLAG          BIT(0)
  33
  34 struct rmnet_map_ul_csum_header {
  35         __be16 csum_start_offset;
  36         __be16 csum_info;               /* MAP_CSUM_UL_* */
  37 } __aligned(1);
  38
  39 /* csum_info field:
  40  *  OFFSET:     where (offset in bytes) to insert computed checksum
  41  *  UDP:        1 = UDP checksum (zero checkum means no checksum)
  42  *  ENABLED:    1 = checksum computation requested
  43  */
  44 #define MAP_CSUM_UL_OFFSET_MASK         GENMASK(13, 0)
  45 #define MAP_CSUM_UL_UDP_FLAG            BIT(14)
  46 #define MAP_CSUM_UL_ENABLED_FLAG        BIT(15)
  47
  48 #endif /* !(_LINUX_IF_RMNET_H_) */