2 * Copyright(c) 2007 Intel Corporation. All rights reserved.
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
17 * Maintained at www.Open-FCoE.org
23 #include <linux/timer.h>
25 #include <linux/percpu.h>
27 #include <scsi/scsi_transport.h>
28 #include <scsi/scsi_transport_fc.h>
29 #include <scsi/scsi_bsg_fc.h>
31 #include <scsi/fc/fc_fcp.h>
32 #include <scsi/fc/fc_ns.h>
33 #include <scsi/fc/fc_ms.h>
34 #include <scsi/fc/fc_els.h>
35 #include <scsi/fc/fc_gs.h>
37 #include <scsi/fc_frame.h>
39 #define FC_FC4_PROV_SIZE (FC_TYPE_FCP + 1) /* size of tables */
44 #define FC_NO_ERR 0 /* no error */
45 #define FC_EX_TIMEOUT 1 /* Exchange timeout */
46 #define FC_EX_CLOSED 2 /* Exchange closed */
49 * enum fc_lport_state - Local port states
50 * @LPORT_ST_DISABLED: Disabled
51 * @LPORT_ST_FLOGI: Fabric login (FLOGI) sent
52 * @LPORT_ST_DNS: Waiting for name server remote port to become ready
53 * @LPORT_ST_RPN_ID: Register port name by ID (RPN_ID) sent
54 * @LPORT_ST_RFT_ID: Register Fibre Channel types by ID (RFT_ID) sent
55 * @LPORT_ST_RFF_ID: Register FC-4 Features by ID (RFF_ID) sent
56 * @LPORT_ST_FDMI: Waiting for mgmt server rport to become ready
58 * @LPORT_ST_SCR: State Change Register (SCR) sent
59 * @LPORT_ST_READY: Ready for use
60 * @LPORT_ST_LOGO: Local port logout (LOGO) sent
61 * @LPORT_ST_RESET: Local port reset
64 LPORT_ST_DISABLED = 0,
90 * enum fc_rport_state - Remote port states
91 * @RPORT_ST_INIT: Initialized
92 * @RPORT_ST_FLOGI: Waiting for FLOGI completion for point-to-multipoint
93 * @RPORT_ST_PLOGI_WAIT: Waiting for peer to login for point-to-multipoint
94 * @RPORT_ST_PLOGI: Waiting for PLOGI completion
95 * @RPORT_ST_PRLI: Waiting for PRLI completion
96 * @RPORT_ST_RTV: Waiting for RTV completion
97 * @RPORT_ST_READY: Ready for use
98 * @RPORT_ST_ADISC: Discover Address sent
99 * @RPORT_ST_DELETE: Remote port being deleted
101 enum fc_rport_state {
114 * struct fc_disc_port - temporary discovery port to hold rport identifiers
115 * @lp: Fibre Channel host port instance
116 * @peers: Node for list management during discovery and RSCN processing
117 * @rport_work: Work struct for starting the rport state machine
118 * @port_id: Port ID of the discovered port
120 struct fc_disc_port {
122 struct list_head peers;
123 struct work_struct rport_work;
128 * enum fc_rport_event - Remote port events
129 * @RPORT_EV_NONE: No event
130 * @RPORT_EV_READY: Remote port is ready for use
131 * @RPORT_EV_FAILED: State machine failed, remote port is not ready
132 * @RPORT_EV_STOP: Remote port has been stopped
133 * @RPORT_EV_LOGO: Remote port logout (LOGO) sent
135 enum fc_rport_event {
143 struct fc_rport_priv;
146 * struct fc_rport_operations - Operations for a remote port
147 * @event_callback: Function to be called for remote port events
149 struct fc_rport_operations {
150 void (*event_callback)(struct fc_lport *, struct fc_rport_priv *,
151 enum fc_rport_event);
155 * struct fc_rport_libfc_priv - libfc internal information about a remote port
156 * @local_port: The associated local port
157 * @rp_state: Indicates READY for I/O or DELETE when blocked
158 * @flags: REC and RETRY supported flags
159 * @e_d_tov: Error detect timeout value (in msec)
160 * @r_a_tov: Resource allocation timeout value (in msec)
162 struct fc_rport_libfc_priv {
163 struct fc_lport *local_port;
164 enum fc_rport_state rp_state;
166 #define FC_RP_FLAGS_REC_SUPPORTED (1 << 0)
167 #define FC_RP_FLAGS_RETRY (1 << 1)
168 #define FC_RP_STARTED (1 << 2)
169 #define FC_RP_FLAGS_CONF_REQ (1 << 3)
170 unsigned int e_d_tov;
171 unsigned int r_a_tov;
175 * struct fc_rport_priv - libfc remote port and discovery info
176 * @local_port: The associated local port
177 * @rport: The FC transport remote port
178 * @kref: Reference counter
179 * @rp_state: Enumeration that tracks progress of PLOGI, PRLI,
181 * @ids: The remote port identifiers and roles
182 * @flags: STARTED, REC and RETRY_SUPPORTED flags
183 * @max_seq: Maximum number of concurrent sequences
184 * @disc_id: The discovery identifier
185 * @maxframe_size: The maximum frame size
186 * @retries: The retry count for the current state
187 * @major_retries: The retry count for the entire PLOGI/PRLI state machine
188 * @e_d_tov: Error detect timeout value (in msec)
189 * @r_a_tov: Resource allocation timeout value (in msec)
190 * @rp_mutex: The mutex that protects the remote port
191 * @retry_work: Handle for retries
192 * @event_callback: Callback when READY, FAILED or LOGO states complete
193 * @prli_count: Count of open PRLI sessions in providers
194 * @rcu: Structure used for freeing in an RCU-safe manner
196 struct fc_rport_priv {
197 struct fc_lport *local_port;
198 struct fc_rport *rport;
200 enum fc_rport_state rp_state;
201 struct fc_rport_identifiers ids;
206 unsigned int retries;
207 unsigned int major_retries;
208 unsigned int e_d_tov;
209 unsigned int r_a_tov;
210 struct mutex rp_mutex;
211 struct delayed_work retry_work;
212 enum fc_rport_event event;
213 struct fc_rport_operations *ops;
214 struct list_head peers;
215 struct work_struct event_work;
216 u32 supported_classes;
221 void (*lld_event_callback)(struct fc_lport *,
222 struct fc_rport_priv *,
223 enum fc_rport_event);
227 * struct fc_stats - fc stats structure
228 * @SecondsSinceLastReset: Seconds since the last reset
229 * @TxFrames: Number of transmitted frames
230 * @TxWords: Number of transmitted words
231 * @RxFrames: Number of received frames
232 * @RxWords: Number of received words
233 * @ErrorFrames: Number of received error frames
234 * @DumpedFrames: Number of dumped frames
235 * @FcpPktAllocFails: Number of fcp packet allocation failures
236 * @FcpPktAborts: Number of fcp packet aborts
237 * @FcpFrameAllocFails: Number of fcp frame allocation failures
238 * @LinkFailureCount: Number of link failures
239 * @LossOfSignalCount: Number for signal losses
240 * @InvalidTxWordCount: Number of invalid transmitted words
241 * @InvalidCRCCount: Number of invalid CRCs
242 * @InputRequests: Number of input requests
243 * @OutputRequests: Number of output requests
244 * @ControlRequests: Number of control requests
245 * @InputBytes: Number of received bytes
246 * @OutputBytes: Number of transmitted bytes
247 * @VLinkFailureCount: Number of virtual link failures
248 * @MissDiscAdvCount: Number of missing FIP discovery advertisement
251 u64 SecondsSinceLastReset;
258 u64 FcpPktAllocFails;
260 u64 FcpFrameAllocFails;
261 u64 LinkFailureCount;
262 u64 LossOfSignalCount;
263 u64 InvalidTxWordCount;
270 u64 VLinkFailureCount;
271 u64 MissDiscAdvCount;
275 * struct fc_seq_els_data - ELS data used for passing ELS specific responses
276 * @reason: The reason for rejection
277 * @explan: The explanation of the rejection
279 * Mainly used by the exchange manager layer.
281 struct fc_seq_els_data {
282 enum fc_els_rjt_reason reason;
283 enum fc_els_rjt_explan explan;
287 * struct fc_fcp_pkt - FCP request structure (one for each scsi_cmnd request)
288 * @lp: The associated local port
289 * @state: The state of the I/O
290 * @ref_cnt: Reference count
291 * @scsi_pkt_lock: Lock to protect the SCSI packet (must be taken before the
292 * host_lock if both are to be held at the same time)
293 * @cmd: The SCSI command (set and clear with the host_lock held)
294 * @list: Tracks queued commands (accessed with the host_lock held)
295 * @timer: The command timer
296 * @tm_done: Completion indicator
297 * @wait_for_comp: Indicator to wait for completion of the I/O (in jiffies)
298 * @data_len: The length of the data
299 * @cdb_cmd: The CDB command
300 * @xfer_len: The transfer length
301 * @xfer_ddp: Indicates if this transfer used DDP (XID of the exchange
302 * will be set here if DDP was setup)
303 * @xfer_contig_end: The offset into the buffer if the buffer is contiguous
305 * @max_payload: The maximum payload size (in bytes)
306 * @io_status: SCSI result (upper 24 bits)
307 * @cdb_status: CDB status
308 * @status_code: FCP I/O status
309 * @scsi_comp_flags: Completion flags (bit 3 Underrun bit 2: overrun)
310 * @req_flags: Request flags (bit 0: read bit:1 write)
311 * @scsi_resid: SCSI residule length
312 * @rport: The remote port that the SCSI command is targeted at
313 * @seq_ptr: The sequence that will carry the SCSI command
314 * @recov_retry: Number of recovery retries
315 * @recov_seq: The sequence for REC or SRR
318 spinlock_t scsi_pkt_lock;
321 /* SCSI command and data transfer information */
324 /* SCSI I/O related information */
325 struct scsi_cmnd *cmd;
326 struct list_head list;
328 /* Housekeeping information */
332 /* SCSI/FCP return status */
340 /* Transport related veriables */
342 struct fcp_cmnd cdb_cmd;
347 /* Associated structures */
348 struct fc_rport *rport;
349 struct fc_seq *seq_ptr;
351 /* Timeout/error related information */
352 struct timer_list timer;
355 struct fc_seq *recov_seq;
356 struct completion tm_done;
357 } ____cacheline_aligned_in_smp;
360 * Structure and function definitions for managing Fibre Channel Exchanges
363 * fc_exch holds state for one exchange and links to its active sequence.
365 * fc_seq holds the state for an individual sequence.
369 struct fc_exch_mgr_anchor;
370 extern u16 fc_cpu_mask; /* cpu mask for possible cpus */
373 * struct fc_seq - FC sequence
374 * @id: The sequence ID
375 * @ssb_stat: Status flags for the sequence status block (SSB)
376 * @cnt: Number of frames sent so far
377 * @rec_data: FC-4 value for REC
386 #define FC_EX_DONE (1 << 0) /* ep is completed */
387 #define FC_EX_RST_CLEANUP (1 << 1) /* reset is forcing completion */
390 * struct fc_exch - Fibre Channel Exchange
391 * @em: Exchange manager
392 * @pool: Exchange pool
393 * @state: The exchange's state
394 * @xid: The exchange ID
395 * @ex_list: Handle used by the EM to track free exchanges
396 * @ex_lock: Lock that protects the exchange
397 * @ex_refcnt: Reference count
398 * @timeout_work: Handle for timeout handler
399 * @lp: The local port that this exchange is on
400 * @oxid: Originator's exchange ID
401 * @rxid: Responder's exchange ID
402 * @oid: Originator's FCID
404 * @did: Destination FCID
405 * @esb_stat: ESB exchange status
406 * @r_a_tov: Resouce allocation time out value (in msecs)
407 * @seq_id: The next sequence ID to use
408 * @encaps: encapsulation information for lower-level driver
409 * @f_ctl: F_CTL flags for the sequence
410 * @fh_type: The frame type
411 * @class: The class of service
412 * @seq: The sequence in use on this exchange
413 * @resp_active: Number of tasks that are concurrently executing @resp().
414 * @resp_task: If @resp_active > 0, either the task executing @resp(), the
415 * task that has been interrupted to execute the soft-IRQ
416 * executing @resp() or NULL if more than one task is executing
417 * @resp concurrently.
418 * @resp_wq: Waitqueue for the tasks waiting on @resp_active.
419 * @resp: Callback for responses on this exchange
420 * @destructor: Called when destroying the exchange
421 * @arg: Passed as a void pointer to the resp() callback
423 * Locking notes: The ex_lock protects following items:
424 * state, esb_stat, f_ctl, seq.ssb_stat
426 * sequence allocation
432 struct fc_exch_mgr *em;
433 struct fc_exch_pool *pool;
434 struct list_head ex_list;
451 struct task_struct *resp_task;
452 wait_queue_head_t resp_wq;
453 void (*resp)(struct fc_seq *, struct fc_frame *, void *);
455 void (*destructor)(struct fc_seq *, void *);
456 struct delayed_work timeout_work;
457 } ____cacheline_aligned_in_smp;
458 #define fc_seq_exch(sp) container_of(sp, struct fc_exch, seq)
461 struct libfc_function_template {
463 * Interface to send a FC frame
467 int (*frame_send)(struct fc_lport *, struct fc_frame *);
470 * Interface to send ELS/CT frames
474 struct fc_seq *(*elsct_send)(struct fc_lport *, u32 did,
475 struct fc_frame *, unsigned int op,
476 void (*resp)(struct fc_seq *,
477 struct fc_frame *, void *arg),
478 void *arg, u32 timer_msec);
481 * Send the FC frame payload using a new exchange and sequence.
483 * The exchange response handler is set in this routine to resp()
484 * function pointer. It can be called in two scenarios: if a timeout
485 * occurs or if a response frame is received for the exchange. The
486 * fc_frame pointer in response handler will also indicate timeout
487 * as error using IS_ERR related macros.
489 * The exchange destructor handler is also set in this routine.
490 * The destructor handler is invoked by EM layer when exchange
491 * is about to free, this can be used by caller to free its
492 * resources along with exchange free.
494 * The arg is passed back to resp and destructor handler.
496 * The timeout value (in msec) for an exchange is set if non zero
497 * timer_msec argument is specified. The timer is canceled when
498 * it fires or when the exchange is done. The exchange timeout handler
499 * is registered by EM layer.
503 struct fc_seq *(*exch_seq_send)(struct fc_lport *, struct fc_frame *,
504 void (*resp)(struct fc_seq *,
507 void (*destructor)(struct fc_seq *,
509 void *, unsigned int timer_msec);
512 * Sets up the DDP context for a given exchange id on the given
513 * scatterlist if LLD supports DDP for large receive.
517 int (*ddp_setup)(struct fc_lport *, u16, struct scatterlist *,
520 * Completes the DDP transfer and returns the length of data DDPed
521 * for the given exchange id.
525 int (*ddp_done)(struct fc_lport *, u16);
527 * Sets up the DDP context for a given exchange id on the given
528 * scatterlist if LLD supports DDP for target.
532 int (*ddp_target)(struct fc_lport *, u16, struct scatterlist *,
535 * Allow LLD to fill its own Link Error Status Block
539 void (*get_lesb)(struct fc_lport *, struct fc_els_lesb *lesb);
541 * Send a frame using an existing sequence and exchange.
545 int (*seq_send)(struct fc_lport *, struct fc_seq *,
549 * Send an ELS response using information from the received frame.
553 void (*seq_els_rsp_send)(struct fc_frame *, enum fc_els_cmd,
554 struct fc_seq_els_data *);
557 * Abort an exchange and sequence. Generally called because of a
558 * exchange timeout or an abort from the upper layer.
560 * A timer_msec can be specified for abort timeout, if non-zero
561 * timer_msec value is specified then exchange resp handler
562 * will be called with timeout error if no response to abort.
566 int (*seq_exch_abort)(const struct fc_seq *,
567 unsigned int timer_msec);
570 * Indicate that an exchange/sequence tuple is complete and the memory
571 * allocated for the related objects may be freed.
575 void (*exch_done)(struct fc_seq *);
578 * Start a new sequence on the same exchange/sequence tuple.
582 struct fc_seq *(*seq_start_next)(struct fc_seq *);
585 * Set a response handler for the exchange of the sequence.
589 void (*seq_set_resp)(struct fc_seq *sp,
590 void (*resp)(struct fc_seq *, struct fc_frame *,
595 * Assign a sequence for an incoming request frame.
599 struct fc_seq *(*seq_assign)(struct fc_lport *, struct fc_frame *);
602 * Release the reference on the sequence returned by seq_assign().
606 void (*seq_release)(struct fc_seq *);
609 * Reset an exchange manager, completing all sequences and exchanges.
610 * If s_id is non-zero, reset only exchanges originating from that FID.
611 * If d_id is non-zero, reset only exchanges sending to that FID.
615 void (*exch_mgr_reset)(struct fc_lport *, u32 s_id, u32 d_id);
618 * Flush the rport work queue. Generally used before shutdown.
622 void (*rport_flush_queue)(void);
625 * Receive a frame for a local port.
629 void (*lport_recv)(struct fc_lport *, struct fc_frame *);
632 * Reset the local port.
636 int (*lport_reset)(struct fc_lport *);
639 * Set the local port FC_ID.
641 * This may be provided by the LLD to allow it to be
642 * notified when the local port is assigned a FC-ID.
644 * The frame, if non-NULL, is the incoming frame with the
645 * FLOGI LS_ACC or FLOGI, and may contain the granted MAC
646 * address for the LLD. The frame pointer may be NULL if
647 * no MAC is associated with this assignment (LOGO or PLOGI).
649 * If FC_ID is non-zero, r_a_tov and e_d_tov must be valid.
651 * Note: this is called with the local port mutex held.
655 void (*lport_set_port_id)(struct fc_lport *, u32 port_id,
659 * Create a remote port with a given port ID
663 struct fc_rport_priv *(*rport_create)(struct fc_lport *, u32);
666 * Initiates the RP state machine. It is called from the LP module.
667 * This function will issue the following commands to the N_Port
668 * identified by the FC ID provided.
676 int (*rport_login)(struct fc_rport_priv *);
679 * Logoff, and remove the rport from the transport if
680 * it had been added. This will send a LOGO to the target.
684 int (*rport_logoff)(struct fc_rport_priv *);
687 * Receive a request from a remote port.
691 void (*rport_recv_req)(struct fc_lport *, struct fc_frame *);
694 * lookup an rport by it's port ID.
698 struct fc_rport_priv *(*rport_lookup)(const struct fc_lport *, u32);
701 * Destroy an rport after final kref_put().
702 * The argument is a pointer to the kref inside the fc_rport_priv.
704 void (*rport_destroy)(struct kref *);
707 * Callback routine after the remote port is logged in
711 void (*rport_event_callback)(struct fc_lport *,
712 struct fc_rport_priv *,
713 enum fc_rport_event);
716 * Send a fcp cmd from fsp pkt.
717 * Called with the SCSI host lock unlocked and irqs disabled.
719 * The resp handler is called when FCP_RSP received.
723 int (*fcp_cmd_send)(struct fc_lport *, struct fc_fcp_pkt *,
724 void (*resp)(struct fc_seq *, struct fc_frame *,
728 * Cleanup the FCP layer, used during link down and reset
732 void (*fcp_cleanup)(struct fc_lport *);
735 * Abort all I/O on a local port
739 void (*fcp_abort_io)(struct fc_lport *);
742 * Receive a request for the discovery layer.
746 void (*disc_recv_req)(struct fc_lport *, struct fc_frame *);
749 * Start discovery for a local port.
753 void (*disc_start)(void (*disc_callback)(struct fc_lport *,
758 * Stop discovery for a given lport. This will remove
759 * all discovered rports
763 void (*disc_stop) (struct fc_lport *);
766 * Stop discovery for a given lport. This will block
767 * until all discovered rports are deleted from the
772 void (*disc_stop_final) (struct fc_lport *);
776 * struct fc_disc - Discovery context
777 * @retry_count: Number of retries
778 * @pending: 1 if discovery is pending, 0 if not
779 * @requested: 1 if discovery has been requested, 0 if not
780 * @seq_count: Number of sequences used for discovery
781 * @buf_len: Length of the discovery buffer
782 * @disc_id: Discovery ID
783 * @rports: List of discovered remote ports
784 * @priv: Private pointer for use by discovery code
785 * @disc_mutex: Mutex that protects the discovery context
786 * @partial_buf: Partial name buffer (if names are returned
787 * in multiple frames)
788 * @disc_work: handle for delayed work context
789 * @disc_callback: Callback routine called when discovery completes
792 unsigned char retry_count;
793 unsigned char pending;
794 unsigned char requested;
795 unsigned short seq_count;
796 unsigned char buf_len;
799 struct list_head rports;
801 struct mutex disc_mutex;
802 struct fc_gpn_ft_resp partial_buf;
803 struct delayed_work disc_work;
805 void (*disc_callback)(struct fc_lport *,
810 * Local port notifier and events.
812 extern struct blocking_notifier_head fc_lport_notifier_head;
813 enum fc_lport_event {
819 * struct fc_lport - Local port
820 * @host: The SCSI host associated with a local port
821 * @ema_list: Exchange manager anchor list
822 * @dns_rdata: The directory server remote port
823 * @ms_rdata: The management server remote port
824 * @ptp_rdata: Point to point remote port
825 * @scsi_priv: FCP layer internal data
826 * @disc: Discovery context
827 * @vports: Child vports if N_Port
828 * @vport: Parent vport if VN_Port
829 * @tt: Libfc function template
830 * @link_up: Link state (1 = link up, 0 = link down)
831 * @qfull: Queue state (1 queue is full, 0 queue is not full)
832 * @state: Identifies the state
833 * @boot_time: Timestamp indicating when the local port came online
834 * @host_stats: SCSI host statistics
835 * @stats: FC local port stats (TODO separate libfc LLD stats)
836 * @retry_count: Number of retries in the current state
837 * @port_id: FC Port ID
838 * @wwpn: World Wide Port Name
839 * @wwnn: World Wide Node Name
840 * @service_params: Common service parameters
841 * @e_d_tov: Error detection timeout value
842 * @r_a_tov: Resouce allocation timeout value
843 * @rnid_gen: RNID information
844 * @sg_supp: Indicates if scatter gather is supported
845 * @seq_offload: Indicates if sequence offload is supported
846 * @crc_offload: Indicates if CRC offload is supported
847 * @lro_enabled: Indicates if large receive offload is supported
848 * @does_npiv: Supports multiple vports
849 * @npiv_enabled: Switch/fabric allows NPIV
850 * @mfs: The maximum Fibre Channel payload size
851 * @max_retry_count: The maximum retry attempts
852 * @max_rport_retry_count: The maximum remote port retry attempts
853 * @rport_priv_size: Size needed by driver after struct fc_rport_priv
854 * @lro_xid: The maximum XID for LRO
855 * @lso_max: The maximum large offload send size
856 * @fcts: FC-4 type mask
857 * @lp_mutex: Mutex to protect the local port
858 * @list: Linkage on list of vport peers
859 * @retry_work: Handle to local port for delayed retry context
860 * @prov: Pointers available for use by passive FC-4 providers
861 * @lport_list: Linkage on module-wide list of local ports
865 struct Scsi_Host *host;
866 struct list_head ema_list;
867 struct fc_rport_priv *dns_rdata;
868 struct fc_rport_priv *ms_rdata;
869 struct fc_rport_priv *ptp_rdata;
873 /* Virtual port information */
874 struct list_head vports;
875 struct fc_vport *vport;
877 /* Operational Information */
878 struct libfc_function_template tt;
881 enum fc_lport_state state;
882 unsigned long boot_time;
883 struct fc_host_statistics host_stats;
884 struct fc_stats __percpu *stats;
887 /* Fabric information */
891 unsigned int service_params;
892 unsigned int e_d_tov;
893 unsigned int r_a_tov;
894 struct fc_els_rnid_gen rnid_gen;
903 u32 point_to_multipoint:1;
907 u8 max_rport_retry_count;
910 u16 link_supported_speeds;
912 unsigned int lso_max;
913 struct fc_ns_fts fcts;
916 struct mutex lp_mutex;
917 struct list_head list;
918 struct delayed_work retry_work;
919 void *prov[FC_FC4_PROV_SIZE];
920 struct list_head lport_list;
924 * struct fc4_prov - FC-4 provider registration
925 * @prli: Handler for incoming PRLI
926 * @prlo: Handler for session reset
927 * @recv: Handler for incoming request
928 * @module: Pointer to module. May be NULL.
931 int (*prli)(struct fc_rport_priv *, u32 spp_len,
932 const struct fc_els_spp *spp_in,
933 struct fc_els_spp *spp_out);
934 void (*prlo)(struct fc_rport_priv *);
935 void (*recv)(struct fc_lport *, struct fc_frame *);
936 struct module *module;
940 * Register FC-4 provider with libfc.
942 int fc_fc4_register_provider(enum fc_fh_type type, struct fc4_prov *);
943 void fc_fc4_deregister_provider(enum fc_fh_type type, struct fc4_prov *);
946 * FC_LPORT HELPER FUNCTIONS
947 *****************************/
950 * fc_lport_test_ready() - Determine if a local port is in the READY state
951 * @lport: The local port to test
953 static inline int fc_lport_test_ready(struct fc_lport *lport)
955 return lport->state == LPORT_ST_READY;
959 * fc_set_wwnn() - Set the World Wide Node Name of a local port
960 * @lport: The local port whose WWNN is to be set
961 * @wwnn: The new WWNN
963 static inline void fc_set_wwnn(struct fc_lport *lport, u64 wwnn)
969 * fc_set_wwpn() - Set the World Wide Port Name of a local port
970 * @lport: The local port whose WWPN is to be set
971 * @wwnn: The new WWPN
973 static inline void fc_set_wwpn(struct fc_lport *lport, u64 wwnn)
979 * fc_lport_state_enter() - Change a local port's state
980 * @lport: The local port whose state is to change
981 * @state: The new state
983 static inline void fc_lport_state_enter(struct fc_lport *lport,
984 enum fc_lport_state state)
986 if (state != lport->state)
987 lport->retry_count = 0;
988 lport->state = state;
992 * fc_lport_init_stats() - Allocate per-CPU statistics for a local port
993 * @lport: The local port whose statistics are to be initialized
995 static inline int fc_lport_init_stats(struct fc_lport *lport)
997 lport->stats = alloc_percpu(struct fc_stats);
1004 * fc_lport_free_stats() - Free memory for a local port's statistics
1005 * @lport: The local port whose statistics are to be freed
1007 static inline void fc_lport_free_stats(struct fc_lport *lport)
1009 free_percpu(lport->stats);
1013 * lport_priv() - Return the private data from a local port
1014 * @lport: The local port whose private data is to be retreived
1016 static inline void *lport_priv(const struct fc_lport *lport)
1018 return (void *)(lport + 1);
1022 * libfc_host_alloc() - Allocate a Scsi_Host with room for a local port and
1024 * @sht: The SCSI host template
1025 * @priv_size: Size of private data
1027 * Returns: libfc lport
1029 static inline struct fc_lport *
1030 libfc_host_alloc(struct scsi_host_template *sht, int priv_size)
1032 struct fc_lport *lport;
1033 struct Scsi_Host *shost;
1035 shost = scsi_host_alloc(sht, sizeof(*lport) + priv_size);
1038 lport = shost_priv(shost);
1039 lport->host = shost;
1040 INIT_LIST_HEAD(&lport->ema_list);
1041 INIT_LIST_HEAD(&lport->vports);
1046 * FC_FCP HELPER FUNCTIONS
1047 *****************************/
1048 static inline bool fc_fcp_is_read(const struct fc_fcp_pkt *fsp)
1050 if (fsp && fsp->cmd)
1051 return fsp->cmd->sc_data_direction == DMA_FROM_DEVICE;
1057 *****************************/
1058 int fc_lport_init(struct fc_lport *);
1059 int fc_lport_destroy(struct fc_lport *);
1060 int fc_fabric_logoff(struct fc_lport *);
1061 int fc_fabric_login(struct fc_lport *);
1062 void __fc_linkup(struct fc_lport *);
1063 void fc_linkup(struct fc_lport *);
1064 void __fc_linkdown(struct fc_lport *);
1065 void fc_linkdown(struct fc_lport *);
1066 void fc_vport_setlink(struct fc_lport *);
1067 void fc_vports_linkchange(struct fc_lport *);
1068 int fc_lport_config(struct fc_lport *);
1069 int fc_lport_reset(struct fc_lport *);
1070 int fc_set_mfs(struct fc_lport *, u32 mfs);
1071 struct fc_lport *libfc_vport_create(struct fc_vport *, int privsize);
1072 struct fc_lport *fc_vport_id_lookup(struct fc_lport *, u32 port_id);
1073 int fc_lport_bsg_request(struct fc_bsg_job *);
1074 void fc_lport_set_local_id(struct fc_lport *, u32 port_id);
1075 void fc_lport_iterate(void (*func)(struct fc_lport *, void *), void *);
1079 *****************************/
1080 int fc_rport_init(struct fc_lport *);
1081 void fc_rport_terminate_io(struct fc_rport *);
1085 *****************************/
1086 void fc_disc_init(struct fc_lport *);
1087 void fc_disc_config(struct fc_lport *, void *);
1089 static inline struct fc_lport *fc_disc_lport(struct fc_disc *disc)
1091 return container_of(disc, struct fc_lport, disc);
1096 *****************************/
1097 int fc_fcp_init(struct fc_lport *);
1098 void fc_fcp_destroy(struct fc_lport *);
1101 * SCSI INTERACTION LAYER
1102 *****************************/
1103 int fc_queuecommand(struct Scsi_Host *, struct scsi_cmnd *);
1104 int fc_eh_abort(struct scsi_cmnd *);
1105 int fc_eh_device_reset(struct scsi_cmnd *);
1106 int fc_eh_host_reset(struct scsi_cmnd *);
1107 int fc_slave_alloc(struct scsi_device *);
1111 *****************************/
1112 int fc_elsct_init(struct fc_lport *);
1113 struct fc_seq *fc_elsct_send(struct fc_lport *, u32 did,
1116 void (*resp)(struct fc_seq *,
1119 void *arg, u32 timer_msec);
1120 void fc_lport_flogi_resp(struct fc_seq *, struct fc_frame *, void *);
1121 void fc_lport_logo_resp(struct fc_seq *, struct fc_frame *, void *);
1122 void fc_fill_reply_hdr(struct fc_frame *, const struct fc_frame *,
1123 enum fc_rctl, u32 parm_offset);
1124 void fc_fill_hdr(struct fc_frame *, const struct fc_frame *,
1125 enum fc_rctl, u32 f_ctl, u16 seq_cnt, u32 parm_offset);
1129 * EXCHANGE MANAGER LAYER
1130 *****************************/
1131 int fc_exch_init(struct fc_lport *);
1132 void fc_exch_update_stats(struct fc_lport *lport);
1133 struct fc_exch_mgr_anchor *fc_exch_mgr_add(struct fc_lport *,
1134 struct fc_exch_mgr *,
1135 bool (*match)(struct fc_frame *));
1136 void fc_exch_mgr_del(struct fc_exch_mgr_anchor *);
1137 int fc_exch_mgr_list_clone(struct fc_lport *src, struct fc_lport *dst);
1138 struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *, enum fc_class class,
1139 u16 min_xid, u16 max_xid,
1140 bool (*match)(struct fc_frame *));
1141 void fc_exch_mgr_free(struct fc_lport *);
1142 void fc_exch_recv(struct fc_lport *, struct fc_frame *);
1143 void fc_exch_mgr_reset(struct fc_lport *, u32 s_id, u32 d_id);
1146 * Functions for fc_functions_template
1148 void fc_get_host_speed(struct Scsi_Host *);
1149 void fc_get_host_port_state(struct Scsi_Host *);
1150 void fc_set_rport_loss_tmo(struct fc_rport *, u32 timeout);
1151 struct fc_host_statistics *fc_get_host_stats(struct Scsi_Host *);
1153 #endif /* _LIBFC_H_ */