1 /*
2  * Copyright (c) 2005 Network Appliance, Inc. All rights reserved.
3  * Copyright (c) 2005 Open Grid Computing, Inc. All rights reserved.
4  *
5  * This software is available to you under a choice of one of two
6  * licenses.  You may choose to be licensed under the terms of the GNU
7  * General Public License (GPL) Version 2, available from the file
8  * COPYING in the main directory of this source tree, or the
9  * OpenIB.org BSD license below:
10  *
11  *     Redistribution and use in source and binary forms, with or
12  *     without modification, are permitted provided that the following
13  *     conditions are met:
14  *
15  *      - Redistributions of source code must retain the above
16  *        copyright notice, this list of conditions and the following
17  *        disclaimer.
18  *
19  *      - Redistributions in binary form must reproduce the above
20  *        copyright notice, this list of conditions and the following
21  *        disclaimer in the documentation and/or other materials
22  *        provided with the distribution.
23  *
24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31  * SOFTWARE.
32  */
33 #ifndef IW_CM_H
34 #define IW_CM_H
35 
36 #include <linux/in.h>
37 #include <rdma/ib_cm.h>
38 
39 struct iw_cm_id;
40 
41 enum iw_cm_event_type {
42 	IW_CM_EVENT_CONNECT_REQUEST = 1, /* connect request received */
43 	IW_CM_EVENT_CONNECT_REPLY,	 /* reply from active connect request */
44 	IW_CM_EVENT_ESTABLISHED,	 /* passive side accept successful */
45 	IW_CM_EVENT_DISCONNECT,		 /* orderly shutdown */
46 	IW_CM_EVENT_CLOSE		 /* close complete */
47 };
48 
49 struct iw_cm_event {
50 	enum iw_cm_event_type event;
51 	int			 status;
52 	struct sockaddr_in local_addr;
53 	struct sockaddr_in remote_addr;
54 	void *private_data;
55 	void *provider_data;
56 	u8 private_data_len;
57 	u8 ord;
58 	u8 ird;
59 };
60 
61 /**
62  * iw_cm_handler - Function to be called by the IW CM when delivering events
63  * to the client.
64  *
65  * @cm_id: The IW CM identifier associated with the event.
66  * @event: Pointer to the event structure.
67  */
68 typedef int (*iw_cm_handler)(struct iw_cm_id *cm_id,
69 			     struct iw_cm_event *event);
70 
71 /**
72  * iw_event_handler - Function called by the provider when delivering provider
73  * events to the IW CM.  Returns either 0 indicating the event was processed
74  * or -errno if the event could not be processed.
75  *
76  * @cm_id: The IW CM identifier associated with the event.
77  * @event: Pointer to the event structure.
78  */
79 typedef int (*iw_event_handler)(struct iw_cm_id *cm_id,
80 				 struct iw_cm_event *event);
81 
82 struct iw_cm_id {
83 	iw_cm_handler		cm_handler;      /* client callback function */
84 	void		        *context;	 /* client cb context */
85 	struct ib_device	*device;
86 	struct sockaddr_in      local_addr;
87 	struct sockaddr_in	remote_addr;
88 	void			*provider_data;	 /* provider private data */
89 	iw_event_handler        event_handler;   /* cb for provider
90 						    events */
91 	/* Used by provider to add and remove refs on IW cm_id */
92 	void (*add_ref)(struct iw_cm_id *);
93 	void (*rem_ref)(struct iw_cm_id *);
94 };
95 
96 struct iw_cm_conn_param {
97 	const void *private_data;
98 	u16 private_data_len;
99 	u32 ord;
100 	u32 ird;
101 	u32 qpn;
102 };
103 
104 struct iw_cm_verbs {
105 	void		(*add_ref)(struct ib_qp *qp);
106 
107 	void		(*rem_ref)(struct ib_qp *qp);
108 
109 	struct ib_qp *	(*get_qp)(struct ib_device *device,
110 				  int qpn);
111 
112 	int		(*connect)(struct iw_cm_id *cm_id,
113 				   struct iw_cm_conn_param *conn_param);
114 
115 	int		(*accept)(struct iw_cm_id *cm_id,
116 				  struct iw_cm_conn_param *conn_param);
117 
118 	int		(*reject)(struct iw_cm_id *cm_id,
119 				  const void *pdata, u8 pdata_len);
120 
121 	int		(*create_listen)(struct iw_cm_id *cm_id,
122 					 int backlog);
123 
124 	int		(*destroy_listen)(struct iw_cm_id *cm_id);
125 };
126 
127 /**
128  * iw_create_cm_id - Create an IW CM identifier.
129  *
130  * @device: The IB device on which to create the IW CM identier.
131  * @event_handler: User callback invoked to report events associated with the
132  *   returned IW CM identifier.
133  * @context: User specified context associated with the id.
134  */
135 struct iw_cm_id *iw_create_cm_id(struct ib_device *device,
136 				 iw_cm_handler cm_handler, void *context);
137 
138 /**
139  * iw_destroy_cm_id - Destroy an IW CM identifier.
140  *
141  * @cm_id: The previously created IW CM identifier to destroy.
142  *
143  * The client can assume that no events will be delivered for the CM ID after
144  * this function returns.
145  */
146 void iw_destroy_cm_id(struct iw_cm_id *cm_id);
147 
148 /**
149  * iw_cm_bind_qp - Unbind the specified IW CM identifier and QP
150  *
151  * @cm_id: The IW CM idenfier to unbind from the QP.
152  * @qp: The QP
153  *
154  * This is called by the provider when destroying the QP to ensure
155  * that any references held by the IWCM are released. It may also
156  * be called by the IWCM when destroying a CM_ID to that any
157  * references held by the provider are released.
158  */
159 void iw_cm_unbind_qp(struct iw_cm_id *cm_id, struct ib_qp *qp);
160 
161 /**
162  * iw_cm_get_qp - Return the ib_qp associated with a QPN
163  *
164  * @ib_device: The IB device
165  * @qpn: The queue pair number
166  */
167 struct ib_qp *iw_cm_get_qp(struct ib_device *device, int qpn);
168 
169 /**
170  * iw_cm_listen - Listen for incoming connection requests on the
171  * specified IW CM id.
172  *
173  * @cm_id: The IW CM identifier.
174  * @backlog: The maximum number of outstanding un-accepted inbound listen
175  *   requests to queue.
176  *
177  * The source address and port number are specified in the IW CM identifier
178  * structure.
179  */
180 int iw_cm_listen(struct iw_cm_id *cm_id, int backlog);
181 
182 /**
183  * iw_cm_accept - Called to accept an incoming connect request.
184  *
185  * @cm_id: The IW CM identifier associated with the connection request.
186  * @iw_param: Pointer to a structure containing connection establishment
187  *   parameters.
188  *
189  * The specified cm_id will have been provided in the event data for a
190  * CONNECT_REQUEST event. Subsequent events related to this connection will be
191  * delivered to the specified IW CM identifier prior and may occur prior to
192  * the return of this function. If this function returns a non-zero value, the
193  * client can assume that no events will be delivered to the specified IW CM
194  * identifier.
195  */
196 int iw_cm_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *iw_param);
197 
198 /**
199  * iw_cm_reject - Reject an incoming connection request.
200  *
201  * @cm_id: Connection identifier associated with the request.
202  * @private_daa: Pointer to data to deliver to the remote peer as part of the
203  *   reject message.
204  * @private_data_len: The number of bytes in the private_data parameter.
205  *
206  * The client can assume that no events will be delivered to the specified IW
207  * CM identifier following the return of this function. The private_data
208  * buffer is available for reuse when this function returns.
209  */
210 int iw_cm_reject(struct iw_cm_id *cm_id, const void *private_data,
211 		 u8 private_data_len);
212 
213 /**
214  * iw_cm_connect - Called to request a connection to a remote peer.
215  *
216  * @cm_id: The IW CM identifier for the connection.
217  * @iw_param: Pointer to a structure containing connection  establishment
218  *   parameters.
219  *
220  * Events may be delivered to the specified IW CM identifier prior to the
221  * return of this function. If this function returns a non-zero value, the
222  * client can assume that no events will be delivered to the specified IW CM
223  * identifier.
224  */
225 int iw_cm_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *iw_param);
226 
227 /**
228  * iw_cm_disconnect - Close the specified connection.
229  *
230  * @cm_id: The IW CM identifier to close.
231  * @abrupt: If 0, the connection will be closed gracefully, otherwise, the
232  *   connection will be reset.
233  *
234  * The IW CM identifier is still active until the IW_CM_EVENT_CLOSE event is
235  * delivered.
236  */
237 int iw_cm_disconnect(struct iw_cm_id *cm_id, int abrupt);
238 
239 /**
240  * iw_cm_init_qp_attr - Called to initialize the attributes of the QP
241  * associated with a IW CM identifier.
242  *
243  * @cm_id: The IW CM identifier associated with the QP
244  * @qp_attr: Pointer to the QP attributes structure.
245  * @qp_attr_mask: Pointer to a bit vector specifying which QP attributes are
246  *   valid.
247  */
248 int iw_cm_init_qp_attr(struct iw_cm_id *cm_id, struct ib_qp_attr *qp_attr,
249 		       int *qp_attr_mask);
250 
251 #endif /* IW_CM_H */
252