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30 * $Id: //depot/users/kenm/FreeBSD-test2/sys/cam/ctl/ctl_frontend.h#2 $
34 * CAM Target Layer front end registration hooks
36 * Author: Ken Merry <ken@FreeBSD.org>
39 #ifndef _CTL_FRONTEND_H_
40 #define _CTL_FRONTEND_H_
43 CTL_PORT_STATUS_NONE = 0x00,
44 CTL_PORT_STATUS_ONLINE = 0x01,
45 CTL_PORT_STATUS_TARG_ONLINE = 0x02,
46 CTL_PORT_STATUS_LUN_ONLINE = 0x04
49 typedef void (*port_func_t)(void *onoff_arg);
50 typedef int (*targ_func_t)(void *arg, struct ctl_id targ_id);
51 typedef int (*lun_func_t)(void *arg, struct ctl_id targ_id, int lun_id);
54 * The ctl_frontend structure is the registration mechanism between a FETD
55 * (Front End Target Driver) and the CTL layer. Here is a description of
58 * port_type: This field tells CTL what kind of front end it is
59 * dealing with. This field serves two purposes.
60 * The first is to let CTL know whether the frontend
61 * in question is inside the main CTL module (i.e.
62 * the ioctl front end), and therefore its module
63 * reference count shouldn't be incremented. The
64 * CTL ioctl front end should continue to use the
65 * CTL_PORT_IOCTL argument as long as it is part of
66 * the main CTL module. The second is to let CTL
67 * know what kind of front end it is dealing with, so
68 * it can return the proper inquiry data for that
71 * num_requested_ctl_io: This is the number of ctl_io structures that the
72 * front end needs for its pool. This should
73 * generally be the maximum number of outstanding
74 * transactions that the FETD can handle. The CTL
75 * layer will add a few to this to account for
76 * ctl_io buffers queued for pending sense data.
77 * (Pending sense only gets queued if the FETD
78 * doesn't support autosense. e.g. non-packetized
79 * parallel SCSI doesn't support autosense.)
81 * port_name: A string describing the FETD. e.g. "LSI 1030T U320"
82 * or whatever you want to use to describe the driver.
85 * physical_port: This is the physical port number of this
86 * particular port within the driver/hardware. This
87 * number is hardware/driver specific.
88 * virtual_port: This is the virtual port number of this
89 * particular port. This is for things like NP-IV.
91 * port_online(): This function is called, with onoff_arg as its
92 * argument, by the CTL layer when it wants the FETD
93 * to start responding to selections on the specified
94 * target ID. (targ_target)
96 * port_offline(): This function is called, with onoff_arg as its
97 * argument, by the CTL layer when it wants the FETD
98 * to stop responding to selection on the specified
99 * target ID. (targ_target)
101 * onoff_arg: This is supplied as an argument to port_online()
102 * and port_offline(). This is specified by the
105 * targ_enable(): This function is called, with targ_lun_arg and a
106 * target ID as its arguments, by CTL when it wants
107 * the FETD to enable a particular target. targ_enable()
108 * will always be called for a particular target ID
109 * before any LUN is enabled for that target. If the
110 * FETD does not support enabling targets, but rather
111 * LUNs, it should ignore this call and return 0. If
112 * the FETD does support enabling targets, it should
113 * return 0 for success and non-zero if it cannot
114 * enable the given target.
116 * TODO: Add the ability to specify a WWID here.
118 * targ_disable(): This function is called, with targ_lun_arg and a
119 * target ID as its arguments, by CTL when it wants
120 * the FETD to disable a particular target.
121 * targ_disable() will always be called for a
122 * particular target ID after all LUNs are disabled
123 * on that particular target. If the FETD does not
124 * support enabling targets, it should ignore this
125 * call and return 0. If the FETD does support
126 * enabling targets, it should return 0 for success,
127 * and non-zero if it cannot disable the given target.
129 * lun_enable(): This function is called, with targ_lun_arg, a target
130 * ID and a LUN ID as its arguments, by CTL when it
131 * wants the FETD to enable a particular LUN. If the
132 * FETD doesn't really know about LUNs, it should
133 * just ignore this call and return 0. If the FETD
134 * cannot enable the requested LUN for some reason, the
135 * FETD should return non-zero status.
137 * lun_disable(): This function is called, with targ_lun_arg, a target
138 * ID and LUN ID as its arguments, by CTL when it
139 * wants the FETD to disable a particular LUN. If the
140 * FETD doesn't really know about LUNs, it should just
141 * ignore this call and return 0. If the FETD cannot
142 * disable the requested LUN for some reason, the
143 * FETD should return non-zero status.
145 * targ_lun_arg: This is supplied as an argument to the targ/lun
146 * enable/disable() functions. This is specified by
149 * fe_datamove(): This function is called one or more times per I/O
150 * by the CTL layer to tell the FETD to initiate a
151 * DMA to or from the data buffer(s) specified by
152 * the passed-in ctl_io structure.
154 * fe_done(): This function is called by the CTL layer when a
155 * particular SCSI I/O or task management command has
156 * completed. For SCSI I/O requests (CTL_IO_SCSI),
157 * sense data is always supplied if the status is
158 * CTL_SCSI_ERROR and the SCSI status byte is
159 * SCSI_STATUS_CHECK_COND. If the FETD doesn't
160 * support autosense, the sense should be queued
161 * back to the CTL layer via ctl_queue_sense().
163 * fe_dump(): This function, if it exists, is called by CTL
164 * to request a dump of any debugging information or
165 * state to the console.
167 * max_targets: The maximum number of targets that we can create
170 * max_target_id: The highest target ID that we can use.
172 * targ_port: The CTL layer assigns a "port number" to every
173 * FETD. This port number should be passed back in
174 * in the header of every ctl_io that is queued to
175 * the CTL layer. This enables us to determine
176 * which bus the command came in on.
178 * ctl_pool_ref: Memory pool reference used by the FETD in calls to
181 * max_initiators: Maximum number of initiators that the FETD is
182 * allowed to have. Initiators should be numbered
183 * from 0 to max_initiators - 1. This value will
184 * typically be 16, and thus not a problem for
185 * parallel SCSI. This may present issues for Fibre
188 * wwnn World Wide Node Name to be used by the FETD.
189 * Note that this is set *after* registration. It
190 * will be set prior to the online function getting
193 * wwpn World Wide Port Name to be used by the FETD.
194 * Note that this is set *after* registration. It
195 * will be set prior to the online function getting
198 * status: Used by CTL to keep track of per-FETD state.
200 * links: Linked list pointers, used by CTL. The FETD
201 * shouldn't touch this field.
203 struct ctl_frontend {
204 ctl_port_type port_type; /* passed to CTL */
205 int num_requested_ctl_io; /* passed to CTL */
206 char *port_name; /* passed to CTL */
207 int physical_port; /* passed to CTL */
208 int virtual_port; /* passed to CTL */
209 port_func_t port_online; /* passed to CTL */
210 port_func_t port_offline; /* passed to CTL */
211 void *onoff_arg; /* passed to CTL */
212 targ_func_t targ_enable; /* passed to CTL */
213 targ_func_t targ_disable; /* passed to CTL */
214 lun_func_t lun_enable; /* passed to CTL */
215 lun_func_t lun_disable; /* passed to CTL */
216 void *targ_lun_arg; /* passed to CTL */
217 void (*fe_datamove)(union ctl_io *io); /* passed to CTL */
218 void (*fe_done)(union ctl_io *io); /* passed to CTL */
219 void (*fe_dump)(void); /* passed to CTL */
220 int max_targets; /* passed to CTL */
221 int max_target_id; /* passed to CTL */
222 int32_t targ_port; /* passed back to FETD */
223 void *ctl_pool_ref; /* passed back to FETD */
224 uint32_t max_initiators; /* passed back to FETD */
225 uint64_t wwnn; /* set by CTL before online */
226 uint64_t wwpn; /* set by CTL before online */
227 ctl_port_status status; /* used by CTL */
228 STAILQ_ENTRY(ctl_frontend) links; /* used by CTL */
232 * This may block until resources are allocated. Called at FETD module load
233 * time. Returns 0 for success, non-zero for failure.
235 int ctl_frontend_register(struct ctl_frontend *fe, int master_SC);
238 * Called at FETD module unload time.
239 * Returns 0 for success, non-zero for failure.
241 int ctl_frontend_deregister(struct ctl_frontend *fe);
244 * Called to set the WWNN and WWPN for a particular frontend.
246 void ctl_frontend_set_wwns(struct ctl_frontend *fe, int wwnn_valid,
247 uint64_t wwnn, int wwpn_valid, uint64_t wwpn);
250 * Called to bring a particular frontend online.
252 void ctl_frontend_online(struct ctl_frontend *fe);
255 * Called to take a particular frontend offline.
257 void ctl_frontend_offline(struct ctl_frontend *fe);
260 * This routine queues I/O and task management requests from the FETD to the
261 * CTL layer. Returns immediately. Returns 0 for success, non-zero for
264 int ctl_queue(union ctl_io *io);
267 * This routine is used if the front end interface doesn't support
268 * autosense (e.g. non-packetized parallel SCSI). This will queue the
269 * scsiio structure back to a per-lun pending sense queue. This MUST be
270 * called BEFORE any request sense can get queued to the CTL layer -- I
271 * need it in the queue in order to service the request. The scsiio
272 * structure passed in here will be freed by the CTL layer when sense is
273 * retrieved by the initiator. Returns 0 for success, non-zero for failure.
275 int ctl_queue_sense(union ctl_io *io);
278 * This routine adds an initiator to CTL's port database. The WWPN should
279 * be the FC WWPN, if available. The targ_port field should be the same as
280 * the targ_port passed back from CTL in the ctl_frontend structure above.
281 * The iid field should be the same as the iid passed in the nexus of each
282 * ctl_io from this initiator.
284 int ctl_add_initiator(uint64_t wwpn, int32_t targ_port, uint32_t iid);
287 * This routine will remove an initiator from CTL's port database. The
288 * targ_port field should be the same as the targ_port passed back in the
289 * ctl_frontend structure above. The iid field should be the same as the
290 * iid passed in the nexus of each ctl_io from this initiator.
293 ctl_remove_initiator(int32_t targ_port, uint32_t iid);
295 #endif /* _CTL_FRONTEND_H_ */