2 * Copyright (c) 2003 Silicon Graphics International Corp.
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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 int (*fe_init_t)(void);
50 typedef void (*fe_shutdown_t)(void);
51 typedef void (*port_func_t)(void *onoff_arg);
52 typedef int (*port_info_func_t)(void *onoff_arg, struct sbuf *sb);
53 typedef int (*lun_func_t)(void *arg, struct ctl_id targ_id, int lun_id);
54 typedef int (*fe_ioctl_t)(struct cdev *dev, u_long cmd, caddr_t addr, int flag,
57 #define CTL_FRONTEND_DECLARE(name, driver) \
58 static int name ## _modevent(module_t mod, int type, void *data) \
62 ctl_frontend_register( \
63 (struct ctl_frontend *)data); \
66 printf(#name " module unload - not possible for this module type\n"); \
73 static moduledata_t name ## _mod = { \
78 DECLARE_MODULE(name, name ## _mod, SI_SUB_CONFIGURE, SI_ORDER_FOURTH); \
79 MODULE_DEPEND(name, ctl, 1, 1, 1); \
80 MODULE_DEPEND(name, cam, 1, 1, 1)
90 * The ctl_frontend structure is the registration mechanism between a FETD
91 * (Front End Target Driver) and the CTL layer. Here is a description of
94 * port_type: This field tells CTL what kind of front end it is
95 * dealing with. This field serves two purposes.
96 * The first is to let CTL know whether the frontend
97 * in question is inside the main CTL module (i.e.
98 * the ioctl front end), and therefore its module
99 * reference count shouldn't be incremented. The
100 * CTL ioctl front end should continue to use the
101 * CTL_PORT_IOCTL argument as long as it is part of
102 * the main CTL module. The second is to let CTL
103 * know what kind of front end it is dealing with, so
104 * it can return the proper inquiry data for that
107 * num_requested_ctl_io: This is the number of ctl_io structures that the
108 * front end needs for its pool. This should
109 * generally be the maximum number of outstanding
110 * transactions that the FETD can handle. The CTL
111 * layer will add a few to this to account for
112 * ctl_io buffers queued for pending sense data.
113 * (Pending sense only gets queued if the FETD
114 * doesn't support autosense. e.g. non-packetized
115 * parallel SCSI doesn't support autosense.)
117 * port_name: A string describing the FETD. e.g. "LSI 1030T U320"
118 * or whatever you want to use to describe the driver.
121 * physical_port: This is the physical port number of this
122 * particular port within the driver/hardware. This
123 * number is hardware/driver specific.
124 * virtual_port: This is the virtual port number of this
125 * particular port. This is for things like NP-IV.
127 * port_online(): This function is called, with onoff_arg as its
128 * argument, by the CTL layer when it wants the FETD
129 * to start responding to selections on the specified
130 * target ID. (targ_target)
132 * port_offline(): This function is called, with onoff_arg as its
133 * argument, by the CTL layer when it wants the FETD
134 * to stop responding to selection on the specified
135 * target ID. (targ_target)
137 * onoff_arg: This is supplied as an argument to port_online()
138 * and port_offline(). This is specified by the
141 * lun_enable(): This function is called, with targ_lun_arg, a target
142 * ID and a LUN ID as its arguments, by CTL when it
143 * wants the FETD to enable a particular LUN. If the
144 * FETD doesn't really know about LUNs, it should
145 * just ignore this call and return 0. If the FETD
146 * cannot enable the requested LUN for some reason, the
147 * FETD should return non-zero status.
149 * lun_disable(): This function is called, with targ_lun_arg, a target
150 * ID and LUN ID as its arguments, by CTL when it
151 * wants the FETD to disable a particular LUN. If the
152 * FETD doesn't really know about LUNs, it should just
153 * ignore this call and return 0. If the FETD cannot
154 * disable the requested LUN for some reason, the
155 * FETD should return non-zero status.
157 * targ_lun_arg: This is supplied as an argument to the targ/lun
158 * enable/disable() functions. This is specified by
161 * fe_datamove(): This function is called one or more times per I/O
162 * by the CTL layer to tell the FETD to initiate a
163 * DMA to or from the data buffer(s) specified by
164 * the passed-in ctl_io structure.
166 * fe_done(): This function is called by the CTL layer when a
167 * particular SCSI I/O or task management command has
168 * completed. For SCSI I/O requests (CTL_IO_SCSI),
169 * sense data is always supplied if the status is
170 * CTL_SCSI_ERROR and the SCSI status byte is
171 * SCSI_STATUS_CHECK_COND. If the FETD doesn't
172 * support autosense, the sense should be queued
173 * back to the CTL layer via ctl_queue_sense().
175 * fe_dump(): This function, if it exists, is called by CTL
176 * to request a dump of any debugging information or
177 * state to the console.
179 * max_targets: The maximum number of targets that we can create
182 * max_target_id: The highest target ID that we can use.
184 * targ_port: The CTL layer assigns a "port number" to every
185 * FETD. This port number should be passed back in
186 * in the header of every ctl_io that is queued to
187 * the CTL layer. This enables us to determine
188 * which bus the command came in on.
190 * ctl_pool_ref: Memory pool reference used by the FETD in calls to
193 * max_initiators: Maximum number of initiators that the FETD is
194 * allowed to have. Initiators should be numbered
195 * from 0 to max_initiators - 1. This value will
196 * typically be 16, and thus not a problem for
197 * parallel SCSI. This may present issues for Fibre
200 * wwnn World Wide Node Name to be used by the FETD.
201 * Note that this is set *after* registration. It
202 * will be set prior to the online function getting
205 * wwpn World Wide Port Name to be used by the FETD.
206 * Note that this is set *after* registration. It
207 * will be set prior to the online function getting
210 * status: Used by CTL to keep track of per-FETD state.
212 * links: Linked list pointers, used by CTL. The FETD
213 * shouldn't touch this field.
216 struct ctl_frontend *frontend;
217 ctl_port_type port_type; /* passed to CTL */
218 int num_requested_ctl_io; /* passed to CTL */
219 char *port_name; /* passed to CTL */
220 int physical_port; /* passed to CTL */
221 int virtual_port; /* passed to CTL */
222 port_func_t port_online; /* passed to CTL */
223 port_func_t port_offline; /* passed to CTL */
224 port_info_func_t port_info; /* passed to CTL */
225 void *onoff_arg; /* passed to CTL */
226 lun_func_t lun_enable; /* passed to CTL */
227 lun_func_t lun_disable; /* passed to CTL */
228 uint32_t *lun_map; /* passed to CTL */
229 void *targ_lun_arg; /* passed to CTL */
230 void (*fe_datamove)(union ctl_io *io); /* passed to CTL */
231 void (*fe_done)(union ctl_io *io); /* passed to CTL */
232 int max_targets; /* passed to CTL */
233 int max_target_id; /* passed to CTL */
234 int32_t targ_port; /* passed back to FETD */
235 void *ctl_pool_ref; /* passed back to FETD */
236 uint32_t max_initiators; /* passed back to FETD */
237 struct ctl_wwpn_iid *wwpn_iid; /* used by CTL */
238 uint64_t wwnn; /* set by CTL before online */
239 uint64_t wwpn; /* set by CTL before online */
240 ctl_port_status status; /* used by CTL */
241 ctl_options_t options; /* passed to CTL */
242 struct ctl_devid *port_devid; /* passed to CTL */
243 struct ctl_devid *target_devid; /* passed to CTL */
244 struct ctl_devid *init_devid; /* passed to CTL */
245 STAILQ_ENTRY(ctl_port) fe_links; /* used by CTL */
246 STAILQ_ENTRY(ctl_port) links; /* used by CTL */
249 struct ctl_frontend {
250 char name[CTL_DRIVER_NAME_LEN]; /* passed to CTL */
251 fe_init_t init; /* passed to CTL */
252 fe_ioctl_t ioctl; /* passed to CTL */
253 void (*fe_dump)(void); /* passed to CTL */
254 fe_shutdown_t shutdown; /* passed to CTL */
255 STAILQ_HEAD(, ctl_port) port_list; /* used by CTL */
256 STAILQ_ENTRY(ctl_frontend) links; /* used by CTL */
260 * This may block until resources are allocated. Called at FETD module load
261 * time. Returns 0 for success, non-zero for failure.
263 int ctl_frontend_register(struct ctl_frontend *fe);
266 * Called at FETD module unload time.
267 * Returns 0 for success, non-zero for failure.
269 int ctl_frontend_deregister(struct ctl_frontend *fe);
272 * Find the frontend by its name. Returns NULL if not found.
274 struct ctl_frontend * ctl_frontend_find(char *frontend_name);
277 * This may block until resources are allocated. Called at FETD module load
278 * time. Returns 0 for success, non-zero for failure.
280 int ctl_port_register(struct ctl_port *port);
283 * Called at FETD module unload time.
284 * Returns 0 for success, non-zero for failure.
286 int ctl_port_deregister(struct ctl_port *port);
289 * Called to set the WWNN and WWPN for a particular frontend.
291 void ctl_port_set_wwns(struct ctl_port *port, int wwnn_valid,
292 uint64_t wwnn, int wwpn_valid, uint64_t wwpn);
295 * Called to bring a particular frontend online.
297 void ctl_port_online(struct ctl_port *fe);
300 * Called to take a particular frontend offline.
302 void ctl_port_offline(struct ctl_port *fe);
305 * This routine queues I/O and task management requests from the FETD to the
306 * CTL layer. Returns immediately. Returns 0 for success, non-zero for
309 int ctl_queue(union ctl_io *io);
312 * This routine is used if the front end interface doesn't support
313 * autosense (e.g. non-packetized parallel SCSI). This will queue the
314 * scsiio structure back to a per-lun pending sense queue. This MUST be
315 * called BEFORE any request sense can get queued to the CTL layer -- I
316 * need it in the queue in order to service the request. The scsiio
317 * structure passed in here will be freed by the CTL layer when sense is
318 * retrieved by the initiator. Returns 0 for success, non-zero for failure.
320 int ctl_queue_sense(union ctl_io *io);
323 * This routine adds an initiator to CTL's port database.
324 * The iid field should be the same as the iid passed in the nexus of each
325 * ctl_io from this initiator.
326 * The WWPN should be the FC WWPN, if available.
328 int ctl_add_initiator(struct ctl_port *port, int iid, uint64_t wwpn, char *name);
331 * This routine will remove an initiator from CTL's port database.
332 * The iid field should be the same as the iid passed in the nexus of each
333 * ctl_io from this initiator.
335 int ctl_remove_initiator(struct ctl_port *port, int iid);
337 #endif /* _CTL_FRONTEND_H_ */