1 /*
2 * Copyright (c) 2005-2014 Intel Corporation. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 *
32 */
33
34 #if !defined(CMA_H)
35 #define CMA_H
36
37 #include <config.h>
38
39 #include <stdlib.h>
40 #include <errno.h>
41 #include <infiniband/endian.h>
42 #include <semaphore.h>
43 #include <stdatomic.h>
44
45 #include <rdma/rdma_cma.h>
46 #include <infiniband/ib.h>
47
48 #define PFX "librdmacm: "
49
50 /*
51 * Fast synchronization for low contention locking.
52 */
53 typedef struct {
54 sem_t sem;
55 _Atomic(int) cnt;
56 } fastlock_t;
fastlock_init(fastlock_t * lock)57 static inline void fastlock_init(fastlock_t *lock)
58 {
59 sem_init(&lock->sem, 0, 0);
60 atomic_store(&lock->cnt, 0);
61 }
fastlock_destroy(fastlock_t * lock)62 static inline void fastlock_destroy(fastlock_t *lock)
63 {
64 sem_destroy(&lock->sem);
65 }
fastlock_acquire(fastlock_t * lock)66 static inline void fastlock_acquire(fastlock_t *lock)
67 {
68 if (atomic_fetch_add(&lock->cnt, 1) > 0)
69 sem_wait(&lock->sem);
70 }
fastlock_release(fastlock_t * lock)71 static inline void fastlock_release(fastlock_t *lock)
72 {
73 if (atomic_fetch_sub(&lock->cnt, 1) > 1)
74 sem_post(&lock->sem);
75 }
76
77 __be16 ucma_get_port(struct sockaddr *addr);
78 int ucma_addrlen(struct sockaddr *addr);
79 void ucma_set_sid(enum rdma_port_space ps, struct sockaddr *addr,
80 struct sockaddr_ib *sib);
81 int ucma_max_qpsize(struct rdma_cm_id *id);
82 int ucma_complete(struct rdma_cm_id *id);
83 int ucma_shutdown(struct rdma_cm_id *id);
84
ERR(int err)85 static inline int ERR(int err)
86 {
87 errno = err;
88 return -1;
89 }
90
91 int ucma_init(void);
92 extern int af_ib_support;
93
94 #define RAI_ROUTEONLY 0x01000000
95
96 void ucma_ib_init(void);
97 void ucma_ib_cleanup(void);
98 void ucma_ib_resolve(struct rdma_addrinfo **rai,
99 const struct rdma_addrinfo *hints);
100
101 struct ib_connect_hdr {
102 uint8_t cma_version;
103 uint8_t ip_version; /* IP version: 7:4 */
104 uint16_t port;
105 uint32_t src_addr[4];
106 uint32_t dst_addr[4];
107 #define cma_src_ip4 src_addr[3]
108 #define cma_src_ip6 src_addr[0]
109 #define cma_dst_ip4 dst_addr[3]
110 #define cma_dst_ip6 dst_addr[0]
111 };
112
113 #endif /* CMA_H */
114