2 * Copyright (c) 2003 Silicon Graphics International Corp.
3 * Copyright (c) 2014-2017 Alexander Motin <mav@FreeBSD.org>
6 * Redistribution and use in source and binary forms, with or without
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15 * including a substantially similar Disclaimer requirement for further
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31 * $Id: //depot/users/kenm/FreeBSD-test2/sys/cam/ctl/ctl_frontend.h#2 $
35 * CAM Target Layer front end registration hooks
37 * Author: Ken Merry <ken@FreeBSD.org>
40 #ifndef _CTL_FRONTEND_H_
41 #define _CTL_FRONTEND_H_
43 #include <cam/ctl/ctl_ioctl.h>
46 CTL_PORT_STATUS_NONE = 0x00,
47 CTL_PORT_STATUS_ONLINE = 0x01,
48 CTL_PORT_STATUS_HA_SHARED = 0x02
51 typedef int (*fe_init_t)(void);
52 typedef int (*fe_shutdown_t)(void);
53 typedef void (*port_func_t)(void *onoff_arg);
54 typedef int (*port_info_func_t)(void *onoff_arg, struct sbuf *sb);
55 typedef int (*lun_func_t)(void *arg, int lun_id);
56 typedef int (*fe_ioctl_t)(struct cdev *dev, u_long cmd, caddr_t addr, int flag,
59 #define CTL_FRONTEND_DECLARE(name, driver) \
60 static int name ## _modevent(module_t mod, int type, void *data) \
64 return (ctl_frontend_register( \
65 (struct ctl_frontend *)data)); \
68 return (ctl_frontend_deregister( \
69 (struct ctl_frontend *)data)); \
76 static moduledata_t name ## _mod = { \
81 DECLARE_MODULE(name, name ## _mod, SI_SUB_CONFIGURE, SI_ORDER_FOURTH); \
82 MODULE_DEPEND(name, ctl, 1, 1, 1); \
83 MODULE_DEPEND(name, cam, 1, 1, 1)
93 * The ctl_frontend structure is the registration mechanism between a FETD
94 * (Front End Target Driver) and the CTL layer. Here is a description of
97 * port_type: This field tells CTL what kind of front end it is
98 * dealing with. This field serves two purposes.
99 * The first is to let CTL know whether the frontend
100 * in question is inside the main CTL module (i.e.
101 * the ioctl front end), and therefore its module
102 * reference count shouldn't be incremented. The
103 * CTL ioctl front end should continue to use the
104 * CTL_PORT_IOCTL argument as long as it is part of
105 * the main CTL module. The second is to let CTL
106 * know what kind of front end it is dealing with, so
107 * it can return the proper inquiry data for that
110 * num_requested_ctl_io: This is the number of ctl_io structures that the
111 * front end needs for its pool. This should
112 * generally be the maximum number of outstanding
113 * transactions that the FETD can handle. The CTL
114 * layer will add a few to this to account for
115 * ctl_io buffers queued for pending sense data.
116 * (Pending sense only gets queued if the FETD
117 * doesn't support autosense. e.g. non-packetized
118 * parallel SCSI doesn't support autosense.)
120 * port_name: A string describing the FETD. e.g. "LSI 1030T U320"
121 * or whatever you want to use to describe the driver.
124 * physical_port: This is the physical port number of this
125 * particular port within the driver/hardware. This
126 * number is hardware/driver specific.
127 * virtual_port: This is the virtual port number of this
128 * particular port. This is for things like NP-IV.
130 * port_online(): This function is called, with onoff_arg as its
131 * argument, by the CTL layer when it wants the FETD
132 * to start responding to selections on the specified
135 * port_offline(): This function is called, with onoff_arg as its
136 * argument, by the CTL layer when it wants the FETD
137 * to stop responding to selection on the specified
140 * onoff_arg: This is supplied as an argument to port_online()
141 * and port_offline(). This is specified by the
144 * lun_enable(): This function is called, with targ_lun_arg, a target
145 * ID and a LUN ID as its arguments, by CTL when it
146 * wants the FETD to enable a particular LUN. If the
147 * FETD doesn't really know about LUNs, it should
148 * just ignore this call and return 0. If the FETD
149 * cannot enable the requested LUN for some reason, the
150 * FETD should return non-zero status.
152 * lun_disable(): This function is called, with targ_lun_arg, a target
153 * ID and LUN ID as its arguments, by CTL when it
154 * wants the FETD to disable a particular LUN. If the
155 * FETD doesn't really know about LUNs, it should just
156 * ignore this call and return 0. If the FETD cannot
157 * disable the requested LUN for some reason, the
158 * FETD should return non-zero status.
160 * targ_lun_arg: This is supplied as an argument to the targ/lun
161 * enable/disable() functions. This is specified by
164 * fe_datamove(): This function is called one or more times per I/O
165 * by the CTL layer to tell the FETD to initiate a
166 * DMA to or from the data buffer(s) specified by
167 * the passed-in ctl_io structure.
169 * fe_done(): This function is called by the CTL layer when a
170 * particular SCSI I/O or task management command has
171 * completed. For SCSI I/O requests (CTL_IO_SCSI),
172 * sense data is always supplied if the status is
173 * CTL_SCSI_ERROR and the SCSI status byte is
174 * SCSI_STATUS_CHECK_COND. If the FETD doesn't
175 * support autosense, the sense should be queued
176 * back to the CTL layer via ctl_queue_sense().
178 * fe_dump(): This function, if it exists, is called by CTL
179 * to request a dump of any debugging information or
180 * state to the console.
182 * max_targets: The maximum number of targets that we can create
185 * max_target_id: The highest target ID that we can use.
187 * targ_port: The CTL layer assigns a "port number" to every
188 * FETD. This port number should be passed back in
189 * in the header of every ctl_io that is queued to
190 * the CTL layer. This enables us to determine
191 * which bus the command came in on.
193 * ctl_pool_ref: Memory pool reference used by the FETD in calls to
196 * max_initiators: Maximum number of initiators that the FETD is
197 * allowed to have. Initiators should be numbered
198 * from 0 to max_initiators - 1. This value will
199 * typically be 16, and thus not a problem for
200 * parallel SCSI. This may present issues for Fibre
203 * wwnn World Wide Node Name to be used by the FETD.
204 * Note that this is set *after* registration. It
205 * will be set prior to the online function getting
208 * wwpn World Wide Port Name to be used by the FETD.
209 * Note that this is set *after* registration. It
210 * will be set prior to the online function getting
213 * status: Used by CTL to keep track of per-FETD state.
215 * links: Linked list pointers, used by CTL. The FETD
216 * shouldn't touch this field.
219 struct ctl_softc *ctl_softc;
220 struct ctl_frontend *frontend;
221 ctl_port_type port_type; /* passed to CTL */
222 int num_requested_ctl_io; /* passed to CTL */
223 char *port_name; /* passed to CTL */
224 int physical_port; /* passed to CTL */
225 int virtual_port; /* passed to CTL */
226 port_func_t port_online; /* passed to CTL */
227 port_func_t port_offline; /* passed to CTL */
228 port_info_func_t port_info; /* passed to CTL */
229 void *onoff_arg; /* passed to CTL */
230 lun_func_t lun_enable; /* passed to CTL */
231 lun_func_t lun_disable; /* passed to CTL */
232 int lun_map_size; /* passed to CTL */
233 uint32_t *lun_map; /* passed to CTL */
234 void *targ_lun_arg; /* passed to CTL */
235 void (*fe_datamove)(union ctl_io *io); /* passed to CTL */
236 void (*fe_done)(union ctl_io *io); /* passed to CTL */
237 int max_targets; /* passed to CTL */
238 int max_target_id; /* passed to CTL */
239 int32_t targ_port; /* passed back to FETD */
240 void *ctl_pool_ref; /* passed back to FETD */
241 uint32_t max_initiators; /* passed back to FETD */
242 struct ctl_wwpn_iid *wwpn_iid; /* used by CTL */
243 uint64_t wwnn; /* set by CTL before online */
244 uint64_t wwpn; /* set by CTL before online */
245 ctl_port_status status; /* used by CTL */
246 ctl_options_t options; /* passed to CTL */
247 struct ctl_devid *port_devid; /* passed to CTL */
248 struct ctl_devid *target_devid; /* passed to CTL */
249 struct ctl_devid *init_devid; /* passed to CTL */
250 struct ctl_io_stats stats; /* used by CTL */
251 struct mtx port_lock; /* used by CTL */
252 STAILQ_ENTRY(ctl_port) fe_links; /* used by CTL */
253 STAILQ_ENTRY(ctl_port) links; /* used by CTL */
256 struct ctl_frontend {
257 char name[CTL_DRIVER_NAME_LEN]; /* passed to CTL */
258 fe_init_t init; /* passed to CTL */
259 fe_ioctl_t ioctl; /* passed to CTL */
260 void (*fe_dump)(void); /* passed to CTL */
261 fe_shutdown_t shutdown; /* passed to CTL */
262 STAILQ_HEAD(, ctl_port) port_list; /* used by CTL */
263 STAILQ_ENTRY(ctl_frontend) links; /* used by CTL */
267 * This may block until resources are allocated. Called at FETD module load
268 * time. Returns 0 for success, non-zero for failure.
270 int ctl_frontend_register(struct ctl_frontend *fe);
273 * Called at FETD module unload time.
274 * Returns 0 for success, non-zero for failure.
276 int ctl_frontend_deregister(struct ctl_frontend *fe);
279 * Find the frontend by its name. Returns NULL if not found.
281 struct ctl_frontend * ctl_frontend_find(char *frontend_name);
284 * This may block until resources are allocated. Called at FETD module load
285 * time. Returns 0 for success, non-zero for failure.
287 int ctl_port_register(struct ctl_port *port);
290 * Called at FETD module unload time.
291 * Returns 0 for success, non-zero for failure.
293 int ctl_port_deregister(struct ctl_port *port);
296 * Called to set the WWNN and WWPN for a particular frontend.
298 void ctl_port_set_wwns(struct ctl_port *port, int wwnn_valid,
299 uint64_t wwnn, int wwpn_valid, uint64_t wwpn);
302 * Called to bring a particular frontend online.
304 void ctl_port_online(struct ctl_port *fe);
307 * Called to take a particular frontend offline.
309 void ctl_port_offline(struct ctl_port *fe);
312 * This routine queues I/O and task management requests from the FETD to the
313 * CTL layer. Returns immediately. Returns 0 for success, non-zero for
316 int ctl_queue(union ctl_io *io);
319 * This routine is used if the front end interface doesn't support
320 * autosense (e.g. non-packetized parallel SCSI). This will queue the
321 * scsiio structure back to a per-lun pending sense queue. This MUST be
322 * called BEFORE any request sense can get queued to the CTL layer -- I
323 * need it in the queue in order to service the request. The scsiio
324 * structure passed in here will be freed by the CTL layer when sense is
325 * retrieved by the initiator. Returns 0 for success, non-zero for failure.
327 int ctl_queue_sense(union ctl_io *io);
330 * This routine adds an initiator to CTL's port database.
331 * The iid field should be the same as the iid passed in the nexus of each
332 * ctl_io from this initiator.
333 * The WWPN should be the FC WWPN, if available.
335 int ctl_add_initiator(struct ctl_port *port, int iid, uint64_t wwpn, char *name);
338 * This routine will remove an initiator from CTL's port database.
339 * The iid field should be the same as the iid passed in the nexus of each
340 * ctl_io from this initiator.
342 int ctl_remove_initiator(struct ctl_port *port, int iid);
344 #endif /* _CTL_FRONTEND_H_ */