fs/ceph/msgr.h

   1 #ifndef __MSGR_H
   2 #define __MSGR_H
   3
   4 /*
   5  * Data types for message passing layer used by Ceph.
   6  */
   7
   8 #define CEPH_MON_PORT    6789  /* default monitor port */
   9
  10 /*
  11  * client-side processes will try to bind to ports in this
  12  * range, simply for the benefit of tools like nmap or wireshark
  13  * that would like to identify the protocol.
  14  */
  15 #define CEPH_PORT_FIRST  6789
  16 #define CEPH_PORT_START  6800  /* non-monitors start here */
  17 #define CEPH_PORT_LAST   6900
  18
  19 /*
  20  * tcp connection banner.  include a protocol version. and adjust
  21  * whenever the wire protocol changes.  try to keep this string length
  22  * constant.
  23  */
  24 #define CEPH_BANNER "ceph v027"
  25 #define CEPH_BANNER_MAX_LEN 30
  26
  27
  28 /*
  29  * Rollover-safe type and comparator for 32-bit sequence numbers.
  30  * Comparator returns -1, 0, or 1.
  31  */
  32 typedef __u32 ceph_seq_t;
  33
  34 static inline __s32 ceph_seq_cmp(__u32 a, __u32 b)
  35 {
  36        return (__s32)a - (__s32)b;
  37 }
  38
  39
  40 /*
  41  * entity_name -- logical name for a process participating in the
  42  * network, e.g. 'mds0' or 'osd3'.
  43  */
  44 struct ceph_entity_name {
  45         __u8 type;      /* CEPH_ENTITY_TYPE_* */
  46         __le64 num;
  47 } __attribute__ ((packed));
  48
  49 #define CEPH_ENTITY_TYPE_MON    0x01
  50 #define CEPH_ENTITY_TYPE_MDS    0x02
  51 #define CEPH_ENTITY_TYPE_OSD    0x04
  52 #define CEPH_ENTITY_TYPE_CLIENT 0x08
  53 #define CEPH_ENTITY_TYPE_ADMIN  0x10
  54 #define CEPH_ENTITY_TYPE_AUTH   0x20
  55
  56 #define CEPH_ENTITY_TYPE_ANY    0xFF
  57
  58 extern const char *ceph_entity_type_name(int type);
  59
  60 /*
  61  * entity_addr -- network address
  62  */
  63 struct ceph_entity_addr {
  64         __le32 type;
  65         __le32 nonce;  /* unique id for process (e.g. pid) */
  66         struct sockaddr_storage in_addr;
  67 } __attribute__ ((packed));
  68
  69 struct ceph_entity_inst {
  70         struct ceph_entity_name name;
  71         struct ceph_entity_addr addr;
  72 } __attribute__ ((packed));
  73
  74
  75 /* used by message exchange protocol */
  76 #define CEPH_MSGR_TAG_READY         1  /* server->client: ready for messages */
  77 #define CEPH_MSGR_TAG_RESETSESSION  2  /* server->client: reset, try again */
  78 #define CEPH_MSGR_TAG_WAIT          3  /* server->client: wait for racing
  79                                           incoming connection */
  80 #define CEPH_MSGR_TAG_RETRY_SESSION 4  /* server->client + cseq: try again
  81                                           with higher cseq */
  82 #define CEPH_MSGR_TAG_RETRY_GLOBAL  5  /* server->client + gseq: try again
  83                                           with higher gseq */
  84 #define CEPH_MSGR_TAG_CLOSE         6  /* closing pipe */
  85 #define CEPH_MSGR_TAG_MSG           7  /* message */
  86 #define CEPH_MSGR_TAG_ACK           8  /* message ack */
  87 #define CEPH_MSGR_TAG_KEEPALIVE     9  /* just a keepalive byte! */
  88 #define CEPH_MSGR_TAG_BADPROTOVER  10  /* bad protocol version */
  89 #define CEPH_MSGR_TAG_BADAUTHORIZER 11 /* bad authorizer */
  90 #define CEPH_MSGR_TAG_FEATURES      12 /* insufficient features */
  91
  92
  93 /*
  94  * connection negotiation
  95  */
  96 struct ceph_msg_connect {
  97         __le64 features;     /* supported feature bits */
  98         __le32 host_type;    /* CEPH_ENTITY_TYPE_* */
  99         __le32 global_seq;   /* count connections initiated by this host */
 100         __le32 connect_seq;  /* count connections initiated in this session */
 101         __le32 protocol_version;
 102         __le32 authorizer_protocol;
 103         __le32 authorizer_len;
 104         __u8  flags;         /* CEPH_MSG_CONNECT_* */
 105 } __attribute__ ((packed));
 106
 107 struct ceph_msg_connect_reply {
 108         __u8 tag;
 109         __le64 features;     /* feature bits for this session */
 110         __le32 global_seq;
 111         __le32 connect_seq;
 112         __le32 protocol_version;
 113         __le32 authorizer_len;
 114         __u8 flags;
 115 } __attribute__ ((packed));
 116
 117 #define CEPH_MSG_CONNECT_LOSSY  1  /* messages i send may be safely dropped */
 118
 119
 120 /*
 121  * message header
 122  */
 123 struct ceph_msg_header {
 124         __le64 seq;       /* message seq# for this session */
 125         __le64 tid;       /* transaction id */
 126         __le16 type;      /* message type */
 127         __le16 priority;  /* priority.  higher value == higher priority */
 128         __le16 version;   /* version of message encoding */
 129
 130         __le32 front_len; /* bytes in main payload */
 131         __le32 middle_len;/* bytes in middle payload */
 132         __le32 data_len;  /* bytes of data payload */
 133         __le16 data_off;  /* sender: include full offset;
 134                              receiver: mask against ~PAGE_MASK */
 135
 136         struct ceph_entity_inst src, orig_src;
 137         __le32 reserved;
 138         __le32 crc;       /* header crc32c */
 139 } __attribute__ ((packed));
 140
 141 #define CEPH_MSG_PRIO_LOW     64
 142 #define CEPH_MSG_PRIO_DEFAULT 127
 143 #define CEPH_MSG_PRIO_HIGH    196
 144 #define CEPH_MSG_PRIO_HIGHEST 255
 145
 146 /*
 147  * follows data payload
 148  */
 149 struct ceph_msg_footer {
 150         __le32 front_crc, middle_crc, data_crc;
 151         __u8 flags;
 152 } __attribute__ ((packed));
 153
 154 #define CEPH_MSG_FOOTER_COMPLETE  (1<<0)   /* msg wasn't aborted */
 155 #define CEPH_MSG_FOOTER_NOCRC     (1<<1)   /* no data crc */
 156
 157
 158 #endif