1/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
2
3/* Authors: Bernard Metzler <bmt@zurich.ibm.com> */
4/*          Greg Joyce <greg@opengridcomputing.com> */
5/* Copyright (c) 2008-2019, IBM Corporation */
6/* Copyright (c) 2017, Open Grid Computing, Inc. */
7
8#ifndef _SIW_CM_H
9#define _SIW_CM_H
10
11#include <net/sock.h>
12#include <linux/tcp.h>
13
14#include <rdma/iw_cm.h>
15
16enum siw_cep_state {
17	SIW_EPSTATE_IDLE = 1,
18	SIW_EPSTATE_LISTENING,
19	SIW_EPSTATE_CONNECTING,
20	SIW_EPSTATE_AWAIT_MPAREQ,
21	SIW_EPSTATE_RECVD_MPAREQ,
22	SIW_EPSTATE_AWAIT_MPAREP,
23	SIW_EPSTATE_RDMA_MODE,
24	SIW_EPSTATE_CLOSED
25};
26
27struct siw_mpa_info {
28	struct mpa_rr hdr; /* peer mpa hdr in host byte order */
29	struct mpa_v2_data v2_ctrl;
30	struct mpa_v2_data v2_ctrl_req;
31	char *pdata;
32	int bytes_rcvd;
33};
34
35struct siw_device;
36
37struct siw_cep {
38	struct iw_cm_id *cm_id;
39	struct siw_device *sdev;
40	struct list_head devq;
41	spinlock_t lock;
42	struct kref ref;
43	int in_use;
44	wait_queue_head_t waitq;
45	enum siw_cep_state state;
46
47	struct list_head listenq;
48	struct siw_cep *listen_cep;
49
50	struct siw_qp *qp;
51	struct socket *sock;
52
53	struct siw_cm_work *mpa_timer;
54	struct list_head work_freelist;
55
56	struct siw_mpa_info mpa;
57	int ord;
58	int ird;
59	bool enhanced_rdma_conn_est;
60
61	/* Saved upcalls of socket */
62	void (*sk_state_change)(struct sock *sk);
63	void (*sk_data_ready)(struct sock *sk);
64	void (*sk_write_space)(struct sock *sk);
65	void (*sk_error_report)(struct sock *sk);
66};
67
68/*
69 * Connection initiator waits 10 seconds to receive an
70 * MPA reply after sending out MPA request. Reponder waits for
71 * 5 seconds for MPA request to arrive if new TCP connection
72 * was set up.
73 */
74#define MPAREQ_TIMEOUT (HZ * 10)
75#define MPAREP_TIMEOUT (HZ * 5)
76
77enum siw_work_type {
78	SIW_CM_WORK_ACCEPT = 1,
79	SIW_CM_WORK_READ_MPAHDR,
80	SIW_CM_WORK_CLOSE_LLP, /* close socket */
81	SIW_CM_WORK_PEER_CLOSE, /* socket indicated peer close */
82	SIW_CM_WORK_MPATIMEOUT
83};
84
85struct siw_cm_work {
86	struct delayed_work work;
87	struct list_head list;
88	enum siw_work_type type;
89	struct siw_cep *cep;
90};
91
92#define to_sockaddr_in(a) (*(struct sockaddr_in *)(&(a)))
93#define to_sockaddr_in6(a) (*(struct sockaddr_in6 *)(&(a)))
94
95static inline int getname_peer(struct socket *s, struct sockaddr_storage *a)
96{
97	return s->ops->getname(s, (struct sockaddr *)a, 1);
98}
99
100static inline int getname_local(struct socket *s, struct sockaddr_storage *a)
101{
102	return s->ops->getname(s, (struct sockaddr *)a, 0);
103}
104
105static inline int ksock_recv(struct socket *sock, char *buf, size_t size,
106			     int flags)
107{
108	struct kvec iov = { buf, size };
109	struct msghdr msg = { .msg_name = NULL, .msg_flags = flags };
110
111	return kernel_recvmsg(sock, &msg, &iov, 1, size, flags);
112}
113
114int siw_connect(struct iw_cm_id *id, struct iw_cm_conn_param *parm);
115int siw_accept(struct iw_cm_id *id, struct iw_cm_conn_param *param);
116int siw_reject(struct iw_cm_id *id, const void *data, u8 len);
117int siw_create_listen(struct iw_cm_id *id, int backlog);
118int siw_destroy_listen(struct iw_cm_id *id);
119
120void siw_cep_get(struct siw_cep *cep);
121void siw_cep_put(struct siw_cep *cep);
122int siw_cm_queue_work(struct siw_cep *cep, enum siw_work_type type);
123
124int siw_cm_init(void);
125void siw_cm_exit(void);
126
127/*
128 * TCP socket interface
129 */
130#define sk_to_qp(sk) (((struct siw_cep *)((sk)->sk_user_data))->qp)
131#define sk_to_cep(sk) ((struct siw_cep *)((sk)->sk_user_data))
132
133#endif
134