lowcomms.h revision b97f8525
1/* SPDX-License-Identifier: GPL-2.0-only */
2/******************************************************************************
3*******************************************************************************
4**
5**  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
6**  Copyright (C) 2004-2009 Red Hat, Inc.  All rights reserved.
7**
8**
9*******************************************************************************
10******************************************************************************/
11
12#ifndef __LOWCOMMS_DOT_H__
13#define __LOWCOMMS_DOT_H__
14
15#include "dlm_internal.h"
16
17#define DLM_MIDCOMMS_OPT_LEN		sizeof(struct dlm_opts)
18#define DLM_MAX_APP_BUFSIZE		(DLM_MAX_SOCKET_BUFSIZE - \
19					 DLM_MIDCOMMS_OPT_LEN)
20
21#define CONN_HASH_SIZE 32
22
23/* This is deliberately very simple because most clusters have simple
24 * sequential nodeids, so we should be able to go straight to a connection
25 * struct in the array
26 */
27static inline int nodeid_hash(int nodeid)
28{
29	return nodeid & (CONN_HASH_SIZE-1);
30}
31
32/* switch to check if dlm is running */
33extern int dlm_allow_conn;
34
35int dlm_lowcomms_start(void);
36void dlm_lowcomms_shutdown(void);
37void dlm_lowcomms_stop(void);
38void dlm_lowcomms_exit(void);
39int dlm_lowcomms_close(int nodeid);
40struct dlm_msg *dlm_lowcomms_new_msg(int nodeid, int len, gfp_t allocation,
41				     char **ppc, void (*cb)(struct dlm_mhandle *mh),
42				     struct dlm_mhandle *mh);
43void dlm_lowcomms_commit_msg(struct dlm_msg *msg);
44void dlm_lowcomms_put_msg(struct dlm_msg *msg);
45int dlm_lowcomms_resend_msg(struct dlm_msg *msg);
46int dlm_lowcomms_connect_node(int nodeid);
47int dlm_lowcomms_nodes_set_mark(int nodeid, unsigned int mark);
48int dlm_lowcomms_addr(int nodeid, struct sockaddr_storage *addr, int len);
49void dlm_midcomms_receive_done(int nodeid);
50
51#endif				/* __LOWCOMMS_DOT_H__ */
52
53