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>
30 #include <scsi/fc/fc_fcp.h>
31 #include <scsi/fc/fc_ns.h>
32 #include <scsi/fc/fc_els.h>
33 #include <scsi/fc/fc_gs.h>
35 #include <scsi/fc_frame.h>
37 #define FC_LIBFC_LOGGING 0x01 /* General logging, not categorized */
38 #define FC_LPORT_LOGGING 0x02 /* lport layer logging */
39 #define FC_DISC_LOGGING 0x04 /* discovery layer logging */
40 #define FC_RPORT_LOGGING 0x08 /* rport layer logging */
41 #define FC_FCP_LOGGING 0x10 /* I/O path logging */
42 #define FC_EM_LOGGING 0x20 /* Exchange Manager logging */
43 #define FC_EXCH_LOGGING 0x40 /* Exchange/Sequence logging */
44 #define FC_SCSI_LOGGING 0x80 /* SCSI logging (mostly error handling) */
46 extern unsigned int fc_debug_logging;
48 #define FC_CHECK_LOGGING(LEVEL, CMD) \
50 if (unlikely(fc_debug_logging & LEVEL)) \
56 #define FC_LIBFC_DBG(fmt, args...) \
57 FC_CHECK_LOGGING(FC_LIBFC_LOGGING, \
58 printk(KERN_INFO "libfc: " fmt, ##args))
60 #define FC_LPORT_DBG(lport, fmt, args...) \
61 FC_CHECK_LOGGING(FC_LPORT_LOGGING, \
62 printk(KERN_INFO "host%u: lport %6x: " fmt, \
63 (lport)->host->host_no, \
64 fc_host_port_id((lport)->host), ##args))
66 #define FC_DISC_DBG(disc, fmt, args...) \
67 FC_CHECK_LOGGING(FC_DISC_LOGGING, \
68 printk(KERN_INFO "host%u: disc: " fmt, \
69 (disc)->lport->host->host_no, \
72 #define FC_RPORT_ID_DBG(lport, port_id, fmt, args...) \
73 FC_CHECK_LOGGING(FC_RPORT_LOGGING, \
74 printk(KERN_INFO "host%u: rport %6x: " fmt, \
75 (lport)->host->host_no, \
78 #define FC_RPORT_DBG(rdata, fmt, args...) \
79 FC_RPORT_ID_DBG((rdata)->local_port, (rdata)->ids.port_id, fmt, ##args)
81 #define FC_FCP_DBG(pkt, fmt, args...) \
82 FC_CHECK_LOGGING(FC_FCP_LOGGING, \
83 printk(KERN_INFO "host%u: fcp: %6x: " fmt, \
84 (pkt)->lp->host->host_no, \
85 pkt->rport->port_id, ##args))
87 #define FC_EXCH_DBG(exch, fmt, args...) \
88 FC_CHECK_LOGGING(FC_EXCH_LOGGING, \
89 printk(KERN_INFO "host%u: xid %4x: " fmt, \
90 (exch)->lp->host->host_no, \
93 #define FC_SCSI_DBG(lport, fmt, args...) \
94 FC_CHECK_LOGGING(FC_SCSI_LOGGING, \
95 printk(KERN_INFO "host%u: scsi: " fmt, \
96 (lport)->host->host_no, ##args))
101 #define FC_NO_ERR 0 /* no error */
102 #define FC_EX_TIMEOUT 1 /* Exchange timeout */
103 #define FC_EX_CLOSED 2 /* Exchange closed */
105 /* some helpful macros */
107 #define ntohll(x) be64_to_cpu(x)
108 #define htonll(x) cpu_to_be64(x)
110 #define ntoh24(p) (((p)[0] << 16) | ((p)[1] << 8) | ((p)[2]))
112 #define hton24(p, v) do { \
113 p[0] = (((v) >> 16) & 0xFF); \
114 p[1] = (((v) >> 8) & 0xFF); \
115 p[2] = ((v) & 0xFF); \
121 enum fc_lport_state {
122 LPORT_ST_DISABLED = 0,
139 enum fc_rport_state {
140 RPORT_ST_INIT, /* initialized */
141 RPORT_ST_PLOGI, /* waiting for PLOGI completion */
142 RPORT_ST_PRLI, /* waiting for PRLI completion */
143 RPORT_ST_RTV, /* waiting for RTV completion */
144 RPORT_ST_READY, /* ready for use */
145 RPORT_ST_LOGO, /* port logout sent */
146 RPORT_ST_ADISC, /* Discover Address sent */
147 RPORT_ST_DELETE, /* port being deleted */
148 RPORT_ST_RESTART, /* remote port being deleted and will restart */
152 * struct fc_disc_port - temporary discovery port to hold rport identifiers
153 * @lp: Fibre Channel host port instance
154 * @peers: Node for list management during discovery and RSCN processing
155 * @rport_work: Work struct for starting the rport state machine
156 * @port_id: Port ID of the discovered port
158 struct fc_disc_port {
160 struct list_head peers;
161 struct work_struct rport_work;
165 enum fc_rport_event {
173 struct fc_rport_priv;
175 struct fc_rport_operations {
176 void (*event_callback)(struct fc_lport *, struct fc_rport_priv *,
177 enum fc_rport_event);
181 * struct fc_rport_libfc_priv - libfc internal information about a remote port
182 * @local_port: Fibre Channel host port instance
183 * @rp_state: indicates READY for I/O or DELETE when blocked.
184 * @flags: REC and RETRY supported flags
185 * @e_d_tov: error detect timeout value (in msec)
186 * @r_a_tov: resource allocation timeout value (in msec)
188 struct fc_rport_libfc_priv {
189 struct fc_lport *local_port;
190 enum fc_rport_state rp_state;
192 #define FC_RP_FLAGS_REC_SUPPORTED (1 << 0)
193 #define FC_RP_FLAGS_RETRY (1 << 1)
194 unsigned int e_d_tov;
195 unsigned int r_a_tov;
199 * struct fc_rport_priv - libfc rport and discovery info about a remote port
200 * @local_port: Fibre Channel host port instance
201 * @rport: transport remote port
202 * @kref: reference counter
203 * @rp_state: state tracks progress of PLOGI, PRLI, and RTV exchanges
204 * @ids: remote port identifiers and roles
205 * @flags: REC and RETRY supported flags
206 * @max_seq: maximum number of concurrent sequences
207 * @disc_id: discovery identifier
208 * @maxframe_size: maximum frame size
209 * @retries: retry count in current state
210 * @e_d_tov: error detect timeout value (in msec)
211 * @r_a_tov: resource allocation timeout value (in msec)
212 * @rp_mutex: mutex protects rport
214 * @event_callback: Callback for rport READY, FAILED or LOGO
216 struct fc_rport_priv {
217 struct fc_lport *local_port;
218 struct fc_rport *rport;
220 enum fc_rport_state rp_state;
221 struct fc_rport_identifiers ids;
226 unsigned int retries;
227 unsigned int e_d_tov;
228 unsigned int r_a_tov;
229 struct mutex rp_mutex;
230 struct delayed_work retry_work;
231 enum fc_rport_event event;
232 struct fc_rport_operations *ops;
233 struct list_head peers;
234 struct work_struct event_work;
235 u32 supported_classes;
239 * fcoe stats structure
241 struct fcoe_dev_stats {
242 u64 SecondsSinceLastReset;
249 u64 LinkFailureCount;
250 u64 LossOfSignalCount;
251 u64 InvalidTxWordCount;
261 * els data is used for passing ELS respone specific
262 * data to send ELS response mainly using infomation
263 * in exchange and sequence in EM layer.
265 struct fc_seq_els_data {
267 enum fc_els_rjt_reason reason;
268 enum fc_els_rjt_explan explan;
272 * FCP request structure, one for each scsi cmd request
278 struct fc_lport *lp; /* handle to hba struct */
279 u16 state; /* scsi_pkt state state */
280 u16 tgt_flags; /* target flags */
281 atomic_t ref_cnt; /* fcp pkt ref count */
282 spinlock_t scsi_pkt_lock; /* Must be taken before the host lock
283 * if both are held at the same time */
285 * SCSI I/O related stuff
287 struct scsi_cmnd *cmd; /* scsi command pointer. set/clear
289 struct list_head list; /* tracks queued commands. access under
292 * timeout related stuff
294 struct timer_list timer; /* command timer */
295 struct completion tm_done;
297 unsigned long start_time; /* start jiffie */
298 unsigned long end_time; /* end jiffie */
299 unsigned long last_pkt_time; /* jiffies of last frame received */
302 * scsi cmd and data transfer information
306 * transport related veriables
308 struct fcp_cmnd cdb_cmd;
310 u16 xfer_ddp; /* this xfer is ddped */
311 u32 xfer_contig_end; /* offset of end of contiguous xfer */
312 u16 max_payload; /* max payload size in bytes */
315 * scsi/fcp return status
317 u32 io_status; /* SCSI result upper 24 bits */
319 u8 status_code; /* FCP I/O status */
320 /* bit 3 Underrun bit 2: overrun */
322 u32 req_flags; /* bit 0: read bit:1 write */
323 u32 scsi_resid; /* residule length */
325 struct fc_rport *rport; /* remote port pointer */
326 struct fc_seq *seq_ptr; /* current sequence pointer */
330 u8 recov_retry; /* count of recovery retries */
331 struct fc_seq *recov_seq; /* sequence for REC or SRR */
334 * FC_FCP HELPER FUNCTIONS
335 *****************************/
336 static inline bool fc_fcp_is_read(const struct fc_fcp_pkt *fsp)
339 return fsp->cmd->sc_data_direction == DMA_FROM_DEVICE;
344 * Structure and function definitions for managing Fibre Channel Exchanges
347 * fc_exch holds state for one exchange and links to its active sequence.
349 * fc_seq holds the state for an individual sequence.
353 struct fc_exch_mgr_anchor;
354 extern u16 fc_cpu_mask; /* cpu mask for possible cpus */
361 u16 ssb_stat; /* status flags for sequence status block */
362 u16 cnt; /* frames sent so far on sequence */
363 u32 rec_data; /* FC-4 value for REC */
366 #define FC_EX_DONE (1 << 0) /* ep is completed */
367 #define FC_EX_RST_CLEANUP (1 << 1) /* reset is forcing completion */
372 * Locking notes: The ex_lock protects following items:
373 * state, esb_stat, f_ctl, seq.ssb_stat
375 * sequence allocation
378 struct fc_exch_mgr *em; /* exchange manager */
379 struct fc_exch_pool *pool; /* per cpu exches pool */
380 u32 state; /* internal driver state */
381 u16 xid; /* our exchange ID */
382 struct list_head ex_list; /* free or busy list linkage */
383 spinlock_t ex_lock; /* lock covering exchange state */
384 atomic_t ex_refcnt; /* reference counter */
385 struct delayed_work timeout_work; /* timer for upper level protocols */
386 struct fc_lport *lp; /* fc device instance */
387 u16 oxid; /* originator's exchange ID */
388 u16 rxid; /* responder's exchange ID */
389 u32 oid; /* originator's FCID */
390 u32 sid; /* source FCID */
391 u32 did; /* destination FCID */
392 u32 esb_stat; /* exchange status for ESB */
393 u32 r_a_tov; /* r_a_tov from rport (msec) */
394 u8 seq_id; /* next sequence ID to use */
395 u32 f_ctl; /* F_CTL flags for sequences */
396 u8 fh_type; /* frame type */
397 enum fc_class class; /* class of service */
398 struct fc_seq seq; /* single sequence */
400 * Handler for responses to this current exchange.
402 void (*resp)(struct fc_seq *, struct fc_frame *, void *);
403 void (*destructor)(struct fc_seq *, void *);
405 * arg is passed as void pointer to exchange
406 * resp and destructor handlers
410 #define fc_seq_exch(sp) container_of(sp, struct fc_exch, seq)
412 struct libfc_function_template {
415 * Interface to send a FC frame
419 int (*frame_send)(struct fc_lport *lp, struct fc_frame *fp);
422 * Interface to send ELS/CT frames
426 struct fc_seq *(*elsct_send)(struct fc_lport *lport,
430 void (*resp)(struct fc_seq *,
433 void *arg, u32 timer_msec);
436 * Send the FC frame payload using a new exchange and sequence.
438 * The frame pointer with some of the header's fields must be
439 * filled before calling exch_seq_send(), those fields are,
446 * - parameter or relative offset
448 * The exchange response handler is set in this routine to resp()
449 * function pointer. It can be called in two scenarios: if a timeout
450 * occurs or if a response frame is received for the exchange. The
451 * fc_frame pointer in response handler will also indicate timeout
452 * as error using IS_ERR related macros.
454 * The exchange destructor handler is also set in this routine.
455 * The destructor handler is invoked by EM layer when exchange
456 * is about to free, this can be used by caller to free its
457 * resources along with exchange free.
459 * The arg is passed back to resp and destructor handler.
461 * The timeout value (in msec) for an exchange is set if non zero
462 * timer_msec argument is specified. The timer is canceled when
463 * it fires or when the exchange is done. The exchange timeout handler
464 * is registered by EM layer.
468 struct fc_seq *(*exch_seq_send)(struct fc_lport *lp,
470 void (*resp)(struct fc_seq *sp,
473 void (*destructor)(struct fc_seq *sp,
475 void *arg, unsigned int timer_msec);
478 * Sets up the DDP context for a given exchange id on the given
479 * scatterlist if LLD supports DDP for large receive.
483 int (*ddp_setup)(struct fc_lport *lp, u16 xid,
484 struct scatterlist *sgl, unsigned int sgc);
486 * Completes the DDP transfer and returns the length of data DDPed
487 * for the given exchange id.
491 int (*ddp_done)(struct fc_lport *lp, u16 xid);
493 * Send a frame using an existing sequence and exchange.
497 int (*seq_send)(struct fc_lport *lp, struct fc_seq *sp,
498 struct fc_frame *fp);
501 * Send an ELS response using infomation from a previous
502 * exchange and sequence.
506 void (*seq_els_rsp_send)(struct fc_seq *sp, enum fc_els_cmd els_cmd,
507 struct fc_seq_els_data *els_data);
510 * Abort an exchange and sequence. Generally called because of a
511 * exchange timeout or an abort from the upper layer.
513 * A timer_msec can be specified for abort timeout, if non-zero
514 * timer_msec value is specified then exchange resp handler
515 * will be called with timeout error if no response to abort.
519 int (*seq_exch_abort)(const struct fc_seq *req_sp,
520 unsigned int timer_msec);
523 * Indicate that an exchange/sequence tuple is complete and the memory
524 * allocated for the related objects may be freed.
528 void (*exch_done)(struct fc_seq *sp);
531 * Start a new sequence on the same exchange/sequence tuple.
535 struct fc_seq *(*seq_start_next)(struct fc_seq *sp);
538 * Reset an exchange manager, completing all sequences and exchanges.
539 * If s_id is non-zero, reset only exchanges originating from that FID.
540 * If d_id is non-zero, reset only exchanges sending to that FID.
544 void (*exch_mgr_reset)(struct fc_lport *,
548 * Flush the rport work queue. Generally used before shutdown.
552 void (*rport_flush_queue)(void);
555 * Receive a frame for a local port.
559 void (*lport_recv)(struct fc_lport *lp, struct fc_seq *sp,
560 struct fc_frame *fp);
563 * Reset the local port.
567 int (*lport_reset)(struct fc_lport *);
570 * Create a remote port with a given port ID
574 struct fc_rport_priv *(*rport_create)(struct fc_lport *, u32);
577 * Initiates the RP state machine. It is called from the LP module.
578 * This function will issue the following commands to the N_Port
579 * identified by the FC ID provided.
587 int (*rport_login)(struct fc_rport_priv *);
590 * Logoff, and remove the rport from the transport if
591 * it had been added. This will send a LOGO to the target.
595 int (*rport_logoff)(struct fc_rport_priv *);
598 * Recieve a request from a remote port.
602 void (*rport_recv_req)(struct fc_seq *, struct fc_frame *,
606 * lookup an rport by it's port ID.
610 struct fc_rport_priv *(*rport_lookup)(const struct fc_lport *, u32);
613 * Destroy an rport after final kref_put().
614 * The argument is a pointer to the kref inside the fc_rport_priv.
616 void (*rport_destroy)(struct kref *);
619 * Send a fcp cmd from fsp pkt.
620 * Called with the SCSI host lock unlocked and irqs disabled.
622 * The resp handler is called when FCP_RSP received.
626 int (*fcp_cmd_send)(struct fc_lport *lp, struct fc_fcp_pkt *fsp,
627 void (*resp)(struct fc_seq *, struct fc_frame *fp,
631 * Cleanup the FCP layer, used durring link down and reset
635 void (*fcp_cleanup)(struct fc_lport *lp);
638 * Abort all I/O on a local port
642 void (*fcp_abort_io)(struct fc_lport *lp);
645 * Receive a request for the discovery layer.
649 void (*disc_recv_req)(struct fc_seq *,
650 struct fc_frame *, struct fc_lport *);
653 * Start discovery for a local port.
657 void (*disc_start)(void (*disc_callback)(struct fc_lport *,
662 * Stop discovery for a given lport. This will remove
663 * all discovered rports
667 void (*disc_stop) (struct fc_lport *);
670 * Stop discovery for a given lport. This will block
671 * until all discovered rports are deleted from the
676 void (*disc_stop_final) (struct fc_lport *);
679 /* information used by the discovery layer */
681 unsigned char retry_count;
682 unsigned char pending;
683 unsigned char requested;
684 unsigned short seq_count;
685 unsigned char buf_len;
688 void (*disc_callback)(struct fc_lport *,
691 struct list_head rports;
692 struct fc_lport *lport;
693 struct mutex disc_mutex;
694 struct fc_gpn_ft_resp partial_buf; /* partial name buffer */
695 struct delayed_work disc_work;
699 struct list_head list;
702 struct Scsi_Host *host;
703 struct list_head ema_list;
704 struct fc_rport_priv *dns_rp;
705 struct fc_rport_priv *ptp_rp;
709 /* Operational Information */
710 struct libfc_function_template tt;
713 enum fc_lport_state state;
714 unsigned long boot_time;
716 struct fc_host_statistics host_stats;
717 struct fcoe_dev_stats *dev_stats;
724 u32 sg_supp:1; /* scatter gather supported */
725 u32 seq_offload:1; /* seq offload supported */
726 u32 crc_offload:1; /* crc offload supported */
727 u32 lro_enabled:1; /* large receive offload */
728 u32 mfs; /* max FC payload size */
729 unsigned int service_params;
730 unsigned int e_d_tov;
731 unsigned int r_a_tov;
733 u8 max_rport_retry_count;
735 u16 link_supported_speeds;
736 u16 lro_xid; /* max xid for fcoe lro */
737 unsigned int lso_max; /* max large send size */
738 struct fc_ns_fts fcts; /* FC-4 type masks */
739 struct fc_els_rnid_gen rnid_gen; /* RNID information */
742 struct mutex lp_mutex;
745 struct delayed_work retry_work;
749 * FC_LPORT HELPER FUNCTIONS
750 *****************************/
751 static inline int fc_lport_test_ready(struct fc_lport *lp)
753 return lp->state == LPORT_ST_READY;
756 static inline void fc_set_wwnn(struct fc_lport *lp, u64 wwnn)
761 static inline void fc_set_wwpn(struct fc_lport *lp, u64 wwnn)
766 static inline void fc_lport_state_enter(struct fc_lport *lp,
767 enum fc_lport_state state)
769 if (state != lp->state)
774 static inline int fc_lport_init_stats(struct fc_lport *lp)
776 /* allocate per cpu stats block */
777 lp->dev_stats = alloc_percpu(struct fcoe_dev_stats);
783 static inline void fc_lport_free_stats(struct fc_lport *lp)
785 free_percpu(lp->dev_stats);
788 static inline struct fcoe_dev_stats *fc_lport_get_stats(struct fc_lport *lp)
790 return per_cpu_ptr(lp->dev_stats, smp_processor_id());
793 static inline void *lport_priv(const struct fc_lport *lp)
795 return (void *)(lp + 1);
799 * libfc_host_alloc() - Allocate a Scsi_Host with room for the fc_lport
800 * @sht: ptr to the scsi host templ
801 * @priv_size: size of private data after fc_lport
803 * Returns: ptr to Scsi_Host
805 static inline struct Scsi_Host *
806 libfc_host_alloc(struct scsi_host_template *sht, int priv_size)
808 return scsi_host_alloc(sht, sizeof(struct fc_lport) + priv_size);
813 *****************************/
814 int fc_lport_init(struct fc_lport *lp);
817 * Destroy the specified local port by finding and freeing all
818 * fc_rports associated with it and then by freeing the fc_lport
821 int fc_lport_destroy(struct fc_lport *lp);
824 * Logout the specified local port from the fabric
826 int fc_fabric_logoff(struct fc_lport *lp);
829 * Initiate the LP state machine. This handler will use fc_host_attr
830 * to store the FLOGI service parameters, so fc_host_attr must be
831 * initialized before calling this handler.
833 int fc_fabric_login(struct fc_lport *lp);
836 * The link is up for the given local port.
838 void fc_linkup(struct fc_lport *);
841 * Link is down for the given local port.
843 void fc_linkdown(struct fc_lport *);
846 * Configure the local port.
848 int fc_lport_config(struct fc_lport *);
851 * Reset the local port.
853 int fc_lport_reset(struct fc_lport *);
856 * Set the mfs or reset
858 int fc_set_mfs(struct fc_lport *lp, u32 mfs);
863 *****************************/
864 int fc_rport_init(struct fc_lport *lp);
865 void fc_rport_terminate_io(struct fc_rport *rp);
869 *****************************/
870 int fc_disc_init(struct fc_lport *lp);
875 *****************************/
877 * Initialize the SCSI block of libfc
879 int fc_fcp_init(struct fc_lport *);
882 * This section provides an API which allows direct interaction
883 * with the SCSI-ml. Each of these functions satisfies a function
884 * pointer defined in Scsi_Host and therefore is always called
885 * directly from the SCSI-ml.
887 int fc_queuecommand(struct scsi_cmnd *sc_cmd,
888 void (*done)(struct scsi_cmnd *));
891 * Send an ABTS frame to the target device. The sc_cmd argument
892 * is a pointer to the SCSI command to be aborted.
894 int fc_eh_abort(struct scsi_cmnd *sc_cmd);
897 * Reset a LUN by sending send the tm cmd to the target.
899 int fc_eh_device_reset(struct scsi_cmnd *sc_cmd);
902 * Reset the host adapter.
904 int fc_eh_host_reset(struct scsi_cmnd *sc_cmd);
907 * Check rport status.
909 int fc_slave_alloc(struct scsi_device *sdev);
912 * Adjust the queue depth.
914 int fc_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason);
917 * Change the tag type.
919 int fc_change_queue_type(struct scsi_device *sdev, int tag_type);
922 * Free memory pools used by the FCP layer.
924 void fc_fcp_destroy(struct fc_lport *);
927 * Set up direct-data placement for this I/O request
929 void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid);
933 *****************************/
935 * Initializes ELS/CT interface
937 int fc_elsct_init(struct fc_lport *lp);
941 * EXCHANGE MANAGER LAYER
942 *****************************/
944 * Initializes Exchange Manager related
945 * function pointers in struct libfc_function_template.
947 int fc_exch_init(struct fc_lport *lp);
950 * Adds Exchange Manager (EM) mp to lport.
952 * Adds specified mp to lport using struct fc_exch_mgr_anchor,
953 * the struct fc_exch_mgr_anchor allows same EM sharing by
954 * more than one lport with their specified match function,
955 * the match function is used in allocating exchange from
958 struct fc_exch_mgr_anchor *fc_exch_mgr_add(struct fc_lport *lport,
959 struct fc_exch_mgr *mp,
960 bool (*match)(struct fc_frame *));
963 * Deletes Exchange Manager (EM) from lport by removing
964 * its anchor ema from lport.
966 * If removed anchor ema was the last user of its associated EM
967 * then also destroys associated EM.
969 void fc_exch_mgr_del(struct fc_exch_mgr_anchor *ema);
972 * Allocates an Exchange Manager (EM).
974 * The EM manages exchanges for their allocation and
975 * free, also allows exchange lookup for received
978 * The class is used for initializing FC class of
979 * allocated exchange from EM.
981 * The min_xid and max_xid will limit new
982 * exchange ID (XID) within this range for
984 * The LLD may choose to have multiple EMs,
985 * e.g. one EM instance per CPU receive thread in LLD.
987 * Specified match function is used in allocating exchanges
988 * from newly allocated EM.
990 struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *lp,
994 bool (*match)(struct fc_frame *));
997 * Free all exchange managers of a lport.
999 void fc_exch_mgr_free(struct fc_lport *lport);
1002 * Receive a frame on specified local port and exchange manager.
1004 void fc_exch_recv(struct fc_lport *lp, struct fc_frame *fp);
1007 * Reset all EMs of a lport, releasing its all sequences and
1008 * exchanges. If sid is non-zero, then reset only exchanges
1009 * we sourced from that FID. If did is non-zero, reset only
1010 * exchanges destined to that FID.
1012 void fc_exch_mgr_reset(struct fc_lport *, u32 s_id, u32 d_id);
1015 * Functions for fc_functions_template
1017 void fc_get_host_speed(struct Scsi_Host *shost);
1018 void fc_get_host_port_type(struct Scsi_Host *shost);
1019 void fc_get_host_port_state(struct Scsi_Host *shost);
1020 void fc_set_rport_loss_tmo(struct fc_rport *rport, u32 timeout);
1021 struct fc_host_statistics *fc_get_host_stats(struct Scsi_Host *);
1024 * module setup functions.
1026 int fc_setup_exch_mgr(void);
1027 void fc_destroy_exch_mgr(void);
1028 int fc_setup_rport(void);
1029 void fc_destroy_rport(void);
1032 * Internal libfc functions.
1034 const char *fc_els_resp_type(struct fc_frame *);
1036 #endif /* _LIBFC_H_ */