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#ifndef __MSGR_H
#define __MSGR_H
/*
* Data types for message passing layer used by Ceph.
*/
#define CEPH_MON_PORT 6789 /* default monitor port */
/*
* client-side processes will try to bind to ports in this
* range, simply for the benefit of tools like nmap or wireshark
* that would like to identify the protocol.
*/
#define CEPH_PORT_FIRST 6789
#define CEPH_PORT_START 6800 /* non-monitors start here */
#define CEPH_PORT_LAST 6900
/*
* tcp connection banner. include a protocol version. and adjust
* whenever the wire protocol changes. try to keep this string length
* constant.
*/
#define CEPH_BANNER "ceph v021"
#define CEPH_BANNER_MAX_LEN 30
/*
* Rollover-safe type and comparator for 32-bit sequence numbers.
* Comparator returns -1, 0, or 1.
*/
typedef __u32 ceph_seq_t;
static inline __s32 ceph_seq_cmp(__u32 a, __u32 b)
{
return (__s32)a - (__s32)b;
}
/*
* entity_name -- logical name for a process participating in the
* network, e.g. 'mds0' or 'osd3'.
*/
struct ceph_entity_name {
__u8 type; /* CEPH_ENTITY_TYPE_* */
__le64 num;
} __attribute__ ((packed));
#define CEPH_ENTITY_TYPE_MON 1
#define CEPH_ENTITY_TYPE_MDS 2
#define CEPH_ENTITY_TYPE_OSD 3
#define CEPH_ENTITY_TYPE_CLIENT 4
#define CEPH_ENTITY_TYPE_ADMIN 5
/*
* entity_addr -- network address
*/
struct ceph_entity_addr {
__le32 erank; /* entity's rank in process */
__le32 nonce; /* unique id for process (e.g. pid) */
struct sockaddr_storage in_addr;
} __attribute__ ((packed));
static inline bool ceph_entity_addr_is_local(const struct ceph_entity_addr *a,
const struct ceph_entity_addr *b)
{
return a->nonce == b->nonce &&
memcmp(&a->in_addr, &b->in_addr, sizeof(a->in_addr)) == 0;
}
static inline bool ceph_entity_addr_equal(const struct ceph_entity_addr *a,
const struct ceph_entity_addr *b)
{
return memcmp(a, b, sizeof(*a)) == 0;
}
struct ceph_entity_inst {
struct ceph_entity_name name;
struct ceph_entity_addr addr;
} __attribute__ ((packed));
/* used by message exchange protocol */
#define CEPH_MSGR_TAG_READY 1 /* server->client: ready for messages */
#define CEPH_MSGR_TAG_RESETSESSION 2 /* server->client: reset, try again */
#define CEPH_MSGR_TAG_WAIT 3 /* server->client: wait for racing
incoming connection */
#define CEPH_MSGR_TAG_RETRY_SESSION 4 /* server->client + cseq: try again
with higher cseq */
#define CEPH_MSGR_TAG_RETRY_GLOBAL 5 /* server->client + gseq: try again
with higher gseq */
#define CEPH_MSGR_TAG_CLOSE 6 /* closing pipe */
#define CEPH_MSGR_TAG_MSG 7 /* message */
#define CEPH_MSGR_TAG_ACK 8 /* message ack */
#define CEPH_MSGR_TAG_KEEPALIVE 9 /* just a keepalive byte! */
#define CEPH_MSGR_TAG_BADPROTOVER 10 /* bad protocol version */
/*
* connection negotiation
*/
struct ceph_msg_connect {
__le32 host_type; /* CEPH_ENTITY_TYPE_* */
__le32 global_seq; /* count connections initiated by this host */
__le32 connect_seq; /* count connections initiated in this session */
__le32 protocol_version;
__u8 flags; /* CEPH_MSG_CONNECT_* */
} __attribute__ ((packed));
struct ceph_msg_connect_reply {
__u8 tag;
__le32 global_seq;
__le32 connect_seq;
__le32 protocol_version;
__u8 flags;
} __attribute__ ((packed));
#define CEPH_MSG_CONNECT_LOSSY 1 /* messages i send may be safely dropped */
/*
* message header
*/
struct ceph_msg_header {
__le64 seq; /* message seq# for this session */
__le16 type; /* message type */
__le16 priority; /* priority. higher value == higher priority */
__le32 front_len; /* bytes in main payload */
__le32 middle_len;/* bytes in middle payload */
__le32 data_len; /* bytes of data payload */
__le16 data_off; /* sender: include full offset;
receiver: mask against ~PAGE_MASK */
struct ceph_entity_inst src, orig_src;
__le32 dst_erank;
__le32 crc; /* header crc32c */
} __attribute__ ((packed));
#define CEPH_MSG_PRIO_LOW 64
#define CEPH_MSG_PRIO_DEFAULT 127
#define CEPH_MSG_PRIO_HIGH 196
#define CEPH_MSG_PRIO_HIGHEST 255
/*
* follows data payload
*/
struct ceph_msg_footer {
__le32 front_crc, middle_crc, data_crc;
__u8 flags;
} __attribute__ ((packed));
#define CEPH_MSG_FOOTER_COMPLETE (1<<0) /* msg wasn't aborted */
#define CEPH_MSG_FOOTER_NOCRC (1<<1) /* no data crc */
#endif
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