drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /* Copyright (c) 2013-2018, The Linux Foundation. All rights reserved.
   3  */
   4
   5 #ifndef _RMNET_MAP_H_
   6 #define _RMNET_MAP_H_
   7
   8 struct rmnet_map_control_command {
   9         u8  command_name;
  10         u8  cmd_type:2;
  11         u8  reserved:6;
  12         u16 reserved2;
  13         u32 transaction_id;
  14         union {
  15                 struct {
  16                         u16 ip_family:2;
  17                         u16 reserved:14;
  18                         __be16 flow_control_seq_num;
  19                         __be32 qos_id;
  20                 } flow_control;
  21                 u8 data[0];
  22         };
  23 }  __aligned(1);
  24
  25 enum rmnet_map_commands {
  26         RMNET_MAP_COMMAND_NONE,
  27         RMNET_MAP_COMMAND_FLOW_DISABLE,
  28         RMNET_MAP_COMMAND_FLOW_ENABLE,
  29         /* These should always be the last 2 elements */
  30         RMNET_MAP_COMMAND_UNKNOWN,
  31         RMNET_MAP_COMMAND_ENUM_LENGTH
  32 };
  33
  34 struct rmnet_map_header {
  35         u8  pad_len:6;
  36         u8  reserved_bit:1;
  37         u8  cd_bit:1;
  38         u8  mux_id;
  39         __be16 pkt_len;
  40 }  __aligned(1);
  41
  42 struct rmnet_map_dl_csum_trailer {
  43         u8  reserved1;
  44         u8  valid:1;
  45         u8  reserved2:7;
  46         u16 csum_start_offset;
  47         u16 csum_length;
  48         __be16 csum_value;
  49 } __aligned(1);
  50
  51 struct rmnet_map_ul_csum_header {
  52         __be16 csum_start_offset;
  53         u16 csum_insert_offset:14;
  54         u16 udp_ip4_ind:1;
  55         u16 csum_enabled:1;
  56 } __aligned(1);
  57
  58 #define RMNET_MAP_GET_MUX_ID(Y) (((struct rmnet_map_header *) \
  59                                  (Y)->data)->mux_id)
  60 #define RMNET_MAP_GET_CD_BIT(Y) (((struct rmnet_map_header *) \
  61                                 (Y)->data)->cd_bit)
  62 #define RMNET_MAP_GET_PAD(Y) (((struct rmnet_map_header *) \
  63                                 (Y)->data)->pad_len)
  64 #define RMNET_MAP_GET_CMD_START(Y) ((struct rmnet_map_control_command *) \
  65                                     ((Y)->data + \
  66                                       sizeof(struct rmnet_map_header)))
  67 #define RMNET_MAP_GET_LENGTH(Y) (ntohs(((struct rmnet_map_header *) \
  68                                         (Y)->data)->pkt_len))
  69
  70 #define RMNET_MAP_COMMAND_REQUEST     0
  71 #define RMNET_MAP_COMMAND_ACK         1
  72 #define RMNET_MAP_COMMAND_UNSUPPORTED 2
  73 #define RMNET_MAP_COMMAND_INVALID     3
  74
  75 #define RMNET_MAP_NO_PAD_BYTES        0
  76 #define RMNET_MAP_ADD_PAD_BYTES       1
  77
  78 struct sk_buff *rmnet_map_deaggregate(struct sk_buff *skb,
  79                                       struct rmnet_port *port);
  80 struct rmnet_map_header *rmnet_map_add_map_header(struct sk_buff *skb,
  81                                                   int hdrlen, int pad);
  82 void rmnet_map_command(struct sk_buff *skb, struct rmnet_port *port);
  83 int rmnet_map_checksum_downlink_packet(struct sk_buff *skb, u16 len);
  84 void rmnet_map_checksum_uplink_packet(struct sk_buff *skb,
  85                                       struct net_device *orig_dev);
  86
  87 #endif /* _RMNET_MAP_H_ */