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Diffstat (limited to 'include/scsi/libfc.h')
| -rw-r--r-- | include/scsi/libfc.h | 938 |
1 files changed, 938 insertions, 0 deletions
diff --git a/include/scsi/libfc.h b/include/scsi/libfc.h new file mode 100644 index 000000000000..9f2876397dda --- /dev/null +++ b/include/scsi/libfc.h @@ -0,0 +1,938 @@ +/* + * Copyright(c) 2007 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + * + * Maintained at www.Open-FCoE.org + */ + +#ifndef _LIBFC_H_ +#define _LIBFC_H_ + +#include <linux/timer.h> +#include <linux/if.h> + +#include <scsi/scsi_transport.h> +#include <scsi/scsi_transport_fc.h> + +#include <scsi/fc/fc_fcp.h> +#include <scsi/fc/fc_ns.h> +#include <scsi/fc/fc_els.h> +#include <scsi/fc/fc_gs.h> + +#include <scsi/fc_frame.h> + +#define LIBFC_DEBUG + +#ifdef LIBFC_DEBUG +/* Log messages */ +#define FC_DBG(fmt, args...) \ + do { \ + printk(KERN_INFO "%s " fmt, __func__, ##args); \ + } while (0) +#else +#define FC_DBG(fmt, args...) +#endif + +/* + * libfc error codes + */ +#define FC_NO_ERR 0 /* no error */ +#define FC_EX_TIMEOUT 1 /* Exchange timeout */ +#define FC_EX_CLOSED 2 /* Exchange closed */ + +/* some helpful macros */ + +#define ntohll(x) be64_to_cpu(x) +#define htonll(x) cpu_to_be64(x) + +#define ntoh24(p) (((p)[0] << 16) | ((p)[1] << 8) | ((p)[2])) + +#define hton24(p, v) do { \ + p[0] = (((v) >> 16) & 0xFF); \ + p[1] = (((v) >> 8) & 0xFF); \ + p[2] = ((v) & 0xFF); \ + } while (0) + +/* + * FC HBA status + */ +#define FC_PAUSE (1 << 1) +#define FC_LINK_UP (1 << 0) + +enum fc_lport_state { + LPORT_ST_NONE = 0, + LPORT_ST_FLOGI, + LPORT_ST_DNS, + LPORT_ST_RPN_ID, + LPORT_ST_RFT_ID, + LPORT_ST_SCR, + LPORT_ST_READY, + LPORT_ST_LOGO, + LPORT_ST_RESET +}; + +enum fc_disc_event { + DISC_EV_NONE = 0, + DISC_EV_SUCCESS, + DISC_EV_FAILED +}; + +enum fc_rport_state { + RPORT_ST_NONE = 0, + RPORT_ST_INIT, /* initialized */ + RPORT_ST_PLOGI, /* waiting for PLOGI completion */ + RPORT_ST_PRLI, /* waiting for PRLI completion */ + RPORT_ST_RTV, /* waiting for RTV completion */ + RPORT_ST_READY, /* ready for use */ + RPORT_ST_LOGO, /* port logout sent */ +}; + +enum fc_rport_trans_state { + FC_PORTSTATE_ROGUE, + FC_PORTSTATE_REAL, +}; + +/** + * struct fc_disc_port - temporary discovery port to hold rport identifiers + * @lp: Fibre Channel host port instance + * @peers: node for list management during discovery and RSCN processing + * @ids: identifiers structure to pass to fc_remote_port_add() + * @rport_work: work struct for starting the rport state machine + */ +struct fc_disc_port { + struct fc_lport *lp; + struct list_head peers; + struct fc_rport_identifiers ids; + struct work_struct rport_work; +}; + +enum fc_rport_event { + RPORT_EV_NONE = 0, + RPORT_EV_CREATED, + RPORT_EV_FAILED, + RPORT_EV_STOP, + RPORT_EV_LOGO +}; + +struct fc_rport_operations { + void (*event_callback)(struct fc_lport *, struct fc_rport *, + enum fc_rport_event); +}; + +/** + * struct fc_rport_libfc_priv - libfc internal information about a remote port + * @local_port: Fibre Channel host port instance + * @rp_state: state tracks progress of PLOGI, PRLI, and RTV exchanges + * @flags: REC and RETRY supported flags + * @max_seq: maximum number of concurrent sequences + * @retries: retry count in current state + * @e_d_tov: error detect timeout value (in msec) + * @r_a_tov: resource allocation timeout value (in msec) + * @rp_mutex: mutex protects rport + * @retry_work: + * @event_callback: Callback for rport READY, FAILED or LOGO + */ +struct fc_rport_libfc_priv { + struct fc_lport *local_port; + enum fc_rport_state rp_state; + u16 flags; + #define FC_RP_FLAGS_REC_SUPPORTED (1 << 0) + #define FC_RP_FLAGS_RETRY (1 << 1) + u16 max_seq; + unsigned int retries; + unsigned int e_d_tov; + unsigned int r_a_tov; + enum fc_rport_trans_state trans_state; + struct mutex rp_mutex; + struct delayed_work retry_work; + enum fc_rport_event event; + struct fc_rport_operations *ops; + struct list_head peers; + struct work_struct event_work; +}; + +#define PRIV_TO_RPORT(x) \ + (struct fc_rport *)((void *)x - sizeof(struct fc_rport)); +#define RPORT_TO_PRIV(x) \ + (struct fc_rport_libfc_priv *)((void *)x + sizeof(struct fc_rport)); + +struct fc_rport *fc_rport_rogue_create(struct fc_disc_port *); + +static inline void fc_rport_set_name(struct fc_rport *rport, u64 wwpn, u64 wwnn) +{ + rport->node_name = wwnn; + rport->port_name = wwpn; +} + +/* + * fcoe stats structure + */ +struct fcoe_dev_stats { + u64 SecondsSinceLastReset; + u64 TxFrames; + u64 TxWords; + u64 RxFrames; + u64 RxWords; + u64 ErrorFrames; + u64 DumpedFrames; + u64 LinkFailureCount; + u64 LossOfSignalCount; + u64 InvalidTxWordCount; + u64 InvalidCRCCount; + u64 InputRequests; + u64 OutputRequests; + u64 ControlRequests; + u64 InputMegabytes; + u64 OutputMegabytes; +}; + +/* + * els data is used for passing ELS respone specific + * data to send ELS response mainly using infomation + * in exchange and sequence in EM layer. + */ +struct fc_seq_els_data { + struct fc_frame *fp; + enum fc_els_rjt_reason reason; + enum fc_els_rjt_explan explan; +}; + +/* + * FCP request structure, one for each scsi cmd request + */ +struct fc_fcp_pkt { + /* + * housekeeping stuff + */ + struct fc_lport *lp; /* handle to hba struct */ + u16 state; /* scsi_pkt state state */ + u16 tgt_flags; /* target flags */ + atomic_t ref_cnt; /* fcp pkt ref count */ + spinlock_t scsi_pkt_lock; /* Must be taken before the host lock + * if both are held at the same time */ + /* + * SCSI I/O related stuff + */ + struct scsi_cmnd *cmd; /* scsi command pointer. set/clear + * under host lock */ + struct list_head list; /* tracks queued commands. access under + * host lock */ + /* + * timeout related stuff + */ + struct timer_list timer; /* command timer */ + struct completion tm_done; + int wait_for_comp; + unsigned long start_time; /* start jiffie */ + unsigned long end_time; /* end jiffie */ + unsigned long last_pkt_time; /* jiffies of last frame received */ + + /* + * scsi cmd and data transfer information + */ + u32 data_len; + /* + * transport related veriables + */ + struct fcp_cmnd cdb_cmd; + size_t xfer_len; + u32 xfer_contig_end; /* offset of end of contiguous xfer */ + u16 max_payload; /* max payload size in bytes */ + + /* + * scsi/fcp return status + */ + u32 io_status; /* SCSI result upper 24 bits */ + u8 cdb_status; + u8 status_code; /* FCP I/O status */ + /* bit 3 Underrun bit 2: overrun */ + u8 scsi_comp_flags; + u32 req_flags; /* bit 0: read bit:1 write */ + u32 scsi_resid; /* residule length */ + + struct fc_rport *rport; /* remote port pointer */ + struct fc_seq *seq_ptr; /* current sequence pointer */ + /* + * Error Processing + */ + u8 recov_retry; /* count of recovery retries */ + struct fc_seq *recov_seq; /* sequence for REC or SRR */ +}; + +/* + * Structure and function definitions for managing Fibre Channel Exchanges + * and Sequences + * + * fc_exch holds state for one exchange and links to its active sequence. + * + * fc_seq holds the state for an individual sequence. + */ + +struct fc_exch_mgr; + +/* + * Sequence. + */ +struct fc_seq { + u8 id; /* seq ID */ + u16 ssb_stat; /* status flags for sequence status block */ + u16 cnt; /* frames sent so far on sequence */ + u32 rec_data; /* FC-4 value for REC */ +}; + +#define FC_EX_DONE (1 << 0) /* ep is completed */ +#define FC_EX_RST_CLEANUP (1 << 1) /* reset is forcing completion */ + +/* + * Exchange. + * + * Locking notes: The ex_lock protects following items: + * state, esb_stat, f_ctl, seq.ssb_stat + * seq_id + * sequence allocation + */ +struct fc_exch { + struct fc_exch_mgr *em; /* exchange manager */ + u32 state; /* internal driver state */ + u16 xid; /* our exchange ID */ + struct list_head ex_list; /* free or busy list linkage */ + spinlock_t ex_lock; /* lock covering exchange state */ + atomic_t ex_refcnt; /* reference counter */ + struct delayed_work timeout_work; /* timer for upper level protocols */ + struct fc_lport *lp; /* fc device instance */ + u16 oxid; /* originator's exchange ID */ + u16 rxid; /* responder's exchange ID */ + u32 oid; /* originator's FCID */ + u32 sid; /* source FCID */ + u32 did; /* destination FCID */ + u32 esb_stat; /* exchange status for ESB */ + u32 r_a_tov; /* r_a_tov from rport (msec) */ + u8 seq_id; /* next sequence ID to use */ + u32 f_ctl; /* F_CTL flags for sequences */ + u8 fh_type; /* frame type */ + enum fc_class class; /* class of service */ + struct fc_seq seq; /* single sequence */ + /* + * Handler for responses to this current exchange. + */ + void (*resp)(struct fc_seq *, struct fc_frame *, void *); + void (*destructor)(struct fc_seq *, void *); + /* + * arg is passed as void pointer to exchange + * resp and destructor handlers + */ + void *arg; +}; +#define fc_seq_exch(sp) container_of(sp, struct fc_exch, seq) + +struct libfc_function_template { + + /** + * Mandatory Fields + * + * These handlers must be implemented by the LLD. + */ + + /* + * Interface to send a FC frame + */ + int (*frame_send)(struct fc_lport *lp, struct fc_frame *fp); + + /** + * Optional Fields + * + * The LLD may choose to implement any of the following handlers. + * If LLD doesn't specify hander and leaves its pointer NULL then + * the default libfc function will be used for that handler. + */ + + /** + * ELS/CT interfaces + */ + + /* + * elsct_send - sends ELS/CT frame + */ + struct fc_seq *(*elsct_send)(struct fc_lport *lport, + struct fc_rport *rport, + struct fc_frame *fp, + unsigned int op, + void (*resp)(struct fc_seq *, + struct fc_frame *fp, + void *arg), + void *arg, u32 timer_msec); + /** + * Exhance Manager interfaces + */ + + /* + * Send the FC frame payload using a new exchange and sequence. + * + * The frame pointer with some of the header's fields must be + * filled before calling exch_seq_send(), those fields are, + * + * - routing control + * - FC port did + * - FC port sid + * - FC header type + * - frame control + * - parameter or relative offset + * + * The exchange response handler is set in this routine to resp() + * function pointer. It can be called in two scenarios: if a timeout + * occurs or if a response frame is received for the exchange. The + * fc_frame pointer in response handler will also indicate timeout + * as error using IS_ERR related macros. + * + * The exchange destructor handler is also set in this routine. + * The destructor handler is invoked by EM layer when exchange + * is about to free, this can be used by caller to free its + * resources along with exchange free. + * + * The arg is passed back to resp and destructor handler. + * + * The timeout value (in msec) for an exchange is set if non zero + * timer_msec argument is specified. The timer is canceled when + * it fires or when the exchange is done. The exchange timeout handler + * is registered by EM layer. + */ + struct fc_seq *(*exch_seq_send)(struct fc_lport *lp, + struct fc_frame *fp, + void (*resp)(struct fc_seq *sp, + struct fc_frame *fp, + void *arg), + void (*destructor)(struct fc_seq *sp, + void *arg), + void *arg, unsigned int timer_msec); + + /* + * send a frame using existing sequence and exchange. + */ + int (*seq_send)(struct fc_lport *lp, struct fc_seq *sp, + struct fc_frame *fp); + + /* + * Send ELS response using mainly infomation + * in exchange and sequence in EM layer. + */ + void (*seq_els_rsp_send)(struct fc_seq *sp, enum fc_els_cmd els_cmd, + struct fc_seq_els_data *els_data); + + /* + * Abort an exchange and sequence. Generally called because of a + * exchange timeout or an abort from the upper layer. + * + * A timer_msec can be specified for abort timeout, if non-zero + * timer_msec value is specified then exchange resp handler + * will be called with timeout error if no response to abort. + */ + int (*seq_exch_abort)(const struct fc_seq *req_sp, + unsigned int timer_msec); + + /* + * Indicate that an exchange/sequence tuple is complete and the memory + * allocated for the related objects may be freed. + */ + void (*exch_done)(struct fc_seq *sp); + + /* + * Assigns a EM and a free XID for an new exchange and then + * allocates a new exchange and sequence pair. + * The fp can be used to determine free XID. + */ + struct fc_exch *(*exch_get)(struct fc_lport *lp, struct fc_frame *fp); + + /* + * Release previously assigned XID by exch_get API. + * The LLD may implement this if XID is assigned by LLD + * in exch_get(). + */ + void (*exch_put)(struct fc_lport *lp, struct fc_exch_mgr *mp, + u16 ex_id); + + /* + * Start a new sequence on the same exchange/sequence tuple. + */ + struct fc_seq *(*seq_start_next)(struct fc_seq *sp); + + /* + * Reset an exchange manager, completing all sequences and exchanges. + * If s_id is non-zero, reset only exchanges originating from that FID. + * If d_id is non-zero, reset only exchanges sending to that FID. + */ + void (*exch_mgr_reset)(struct fc_exch_mgr *, + u32 s_id, u32 d_id); + + void (*rport_flush_queue)(void); + /** + * Local Port interfaces + */ + + /* + * Receive a frame to a local port. + */ + void (*lport_recv)(struct fc_lport *lp, struct fc_seq *sp, + struct fc_frame *fp); + + int (*lport_reset)(struct fc_lport *); + + /** + * Remote Port interfaces + */ + + /* + * Initiates the RP state machine. It is called from the LP module. + * This function will issue the following commands to the N_Port + * identified by the FC ID provided. + * + * - PLOGI + * - PRLI + * - RTV + */ + int (*rport_login)(struct fc_rport *rport); + + /* + * Logoff, and remove the rport from the transport if + * it had been added. This will send a LOGO to the target. + */ + int (*rport_logoff)(struct fc_rport *rport); + + /* + * Recieve a request from a remote port. + */ + void (*rport_recv_req)(struct fc_seq *, struct fc_frame *, + struct fc_rport *); + + struct fc_rport *(*rport_lookup)(const struct fc_lport *, u32); + + /** + * FCP interfaces + */ + + /* + * Send a fcp cmd from fsp pkt. + * Called with the SCSI host lock unlocked and irqs disabled. + * + * The resp handler is called when FCP_RSP received. + * + */ + int (*fcp_cmd_send)(struct fc_lport *lp, struct fc_fcp_pkt *fsp, + void (*resp)(struct fc_seq *, struct fc_frame *fp, + void *arg)); + + /* + * Used at least durring linkdown and reset + */ + void (*fcp_cleanup)(struct fc_lport *lp); + + /* + * Abort all I/O on a local port + */ + void (*fcp_abort_io)(struct fc_lport *lp); + + /** + * Discovery interfaces + */ + + void (*disc_recv_req)(struct fc_seq *, + struct fc_frame *, struct fc_lport *); + + /* + * Start discovery for a local port. + */ + void (*disc_start)(void (*disc_callback)(struct fc_lport *, + enum fc_disc_event), + struct fc_lport *); + + /* + * Stop discovery for a given lport. This will remove + * all discovered rports + */ + void (*disc_stop) (struct fc_lport *); + + /* + * Stop discovery for a given lport. This will block + * until all discovered rports are deleted from the + * FC transport class + */ + void (*disc_stop_final) (struct fc_lport *); +}; + +/* information used by the discovery layer */ +struct fc_disc { + unsigned char retry_count; + unsigned char delay; + unsigned char pending; + unsigned char requested; + unsigned short seq_count; + unsigned char buf_len; + enum fc_disc_event event; + + void (*disc_callback)(struct fc_lport *, + enum fc_disc_event); + + struct list_head rports; + struct fc_lport *lport; + struct mutex disc_mutex; + struct fc_gpn_ft_resp partial_buf; /* partial name buffer */ + struct delayed_work disc_work; +}; + +struct fc_lport { + struct list_head list; + + /* Associations */ + struct Scsi_Host *host; + struct fc_exch_mgr *emp; + struct fc_rport *dns_rp; + struct fc_rport *ptp_rp; + void *scsi_priv; + struct fc_disc disc; + + /* Operational Information */ + struct libfc_function_template tt; + u16 link_status; + enum fc_lport_state state; + unsigned long boot_time; + + struct fc_host_statistics host_stats; + struct fcoe_dev_stats *dev_stats[NR_CPUS]; + u64 wwpn; + u64 wwnn; + u8 retry_count; + + /* Capabilities */ + u32 sg_supp:1; /* scatter gather supported */ + u32 seq_offload:1; /* seq offload supported */ + u32 crc_offload:1; /* crc offload supported */ + u32 lro_enabled:1; /* large receive offload */ + u32 mfs; /* max FC payload size */ + unsigned int service_params; + unsigned int e_d_tov; + unsigned int r_a_tov; + u8 max_retry_count; + u16 link_speed; + u16 link_supported_speeds; + u16 lro_xid; /* max xid for fcoe lro */ + struct fc_ns_fts fcts; /* FC-4 type masks */ + struct fc_els_rnid_gen rnid_gen; /* RNID information */ + + /* Semaphores */ + struct mutex lp_mutex; + + /* Miscellaneous */ + struct delayed_work retry_work; + struct delayed_work disc_work; +}; + +/** + * FC_LPORT HELPER FUNCTIONS + *****************************/ +static inline void *lport_priv(const struct fc_lport *lp) +{ + return (void *)(lp + 1); +} + +static inline int fc_lport_test_ready(struct fc_lport *lp) +{ + return lp->state == LPORT_ST_READY; +} + +static inline void fc_set_wwnn(struct fc_lport *lp, u64 wwnn) +{ + lp->wwnn = wwnn; +} + +static inline void fc_set_wwpn(struct fc_lport *lp, u64 wwnn) +{ + lp->wwpn = wwnn; +} + +static inline void fc_lport_state_enter(struct fc_lport *lp, + enum fc_lport_state state) +{ + if (state != lp->state) + lp->retry_count = 0; + lp->state = state; +} + + +/** + * LOCAL PORT LAYER + *****************************/ +int fc_lport_init(struct fc_lport *lp); + +/* + * Destroy the specified local port by finding and freeing all + * fc_rports associated with it and then by freeing the fc_lport + * itself. + */ +int fc_lport_destroy(struct fc_lport *lp); + +/* + * Logout the specified local port from the fabric + */ +int fc_fabric_logoff(struct fc_lport *lp); + +/* + * Initiate the LP state machine. This handler will use fc_host_attr + * to store the FLOGI service parameters, so fc_host_attr must be + * initialized before calling this handler. + */ +int fc_fabric_login(struct fc_lport *lp); + +/* + * The link is up for the given local port. + */ +void fc_linkup(struct fc_lport *); + +/* + * Link is down for the given local port. + */ +void fc_linkdown(struct fc_lport *); + +/* + * Pause and unpause traffic. + */ +void fc_pause(struct fc_lport *); +void fc_unpause(struct fc_lport *); + +/* + * Configure the local port. + */ +int fc_lport_config(struct fc_lport *); + +/* + * Reset the local port. + */ +int fc_lport_reset(struct fc_lport *); + +/* + * Set the mfs or reset + */ +int fc_set_mfs(struct fc_lport *lp, u32 mfs); + + +/** + * REMOTE PORT LAYER + *****************************/ +int fc_rport_init(struct fc_lport *lp); +void fc_rport_terminate_io(struct fc_rport *rp); + +/** + * DISCOVERY LAYER + *****************************/ +int fc_disc_init(struct fc_lport *lp); + + +/** + * SCSI LAYER + *****************************/ +/* + * Initialize the SCSI block of libfc + */ +int fc_fcp_init(struct fc_lport *); + +/* + * This section provides an API which allows direct interaction + * with the SCSI-ml. Each of these functions satisfies a function + * pointer defined in Scsi_Host and therefore is always called + * directly from the SCSI-ml. + */ +int fc_queuecommand(struct scsi_cmnd *sc_cmd, + void (*done)(struct scsi_cmnd *)); + +/* + * complete processing of a fcp packet + * + * This function may sleep if a fsp timer is pending. + * The host lock must not be held by caller. + */ +void fc_fcp_complete(struct fc_fcp_pkt *fsp); + +/* + * Send an ABTS frame to the target device. The sc_cmd argument + * is a pointer to the SCSI command to be aborted. + */ +int fc_eh_abort(struct scsi_cmnd *sc_cmd); + +/* + * Reset a LUN by sending send the tm cmd to the target. + */ +int fc_eh_device_reset(struct scsi_cmnd *sc_cmd); + +/* + * Reset the host adapter. + */ +int fc_eh_host_reset(struct scsi_cmnd *sc_cmd); + +/* + * Check rport status. + */ +int fc_slave_alloc(struct scsi_device *sdev); + +/* + * Adjust the queue depth. + */ +int fc_change_queue_depth(struct scsi_device *sdev, int qdepth); + +/* + * Change the tag type. + */ +int fc_change_queue_type(struct scsi_device *sdev, int tag_type); + +/* + * Free memory pools used by the FCP layer. + */ +void fc_fcp_destroy(struct fc_lport *); + +/** + * ELS/CT interface + *****************************/ +/* + * Initializes ELS/CT interface + */ +int fc_elsct_init(struct fc_lport *lp); + + +/** + * EXCHANGE MANAGER LAYER + *****************************/ +/* + * Initializes Exchange Manager related + * function pointers in struct libfc_function_template. + */ +int fc_exch_init(struct fc_lport *lp); + +/* + * Allocates an Exchange Manager (EM). + * + * The EM manages exchanges for their allocation and + * free, also allows exchange lookup for received + * frame. + * + * The class is used for initializing FC class of + * allocated exchange from EM. + * + * The min_xid and max_xid will limit new + * exchange ID (XID) within this range for + * a new exchange. + * The LLD may choose to have multiple EMs, + * e.g. one EM instance per CPU receive thread in LLD. + * The LLD can use exch_get() of struct libfc_function_template + * to specify XID for a new exchange within + * a specified EM instance. + * + * The em_idx to uniquely identify an EM instance. + */ +struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *lp, + enum fc_class class, + u16 min_xid, + u16 max_xid); + +/* + * Free an exchange manager. + */ +void fc_exch_mgr_free(struct fc_exch_mgr *mp); + +/* + * Receive a frame on specified local port and exchange manager. + */ +void fc_exch_recv(struct fc_lport *lp, struct fc_exch_mgr *mp, + struct fc_frame *fp); + +/* + * This function is for exch_seq_send function pointer in + * struct libfc_function_template, see comment block on + * exch_seq_send for description of this function. + */ +struct fc_seq *fc_exch_seq_send(struct fc_lport *lp, + struct fc_frame *fp, + void (*resp)(struct fc_seq *sp, + struct fc_frame *fp, + void *arg), + void (*destructor)(struct fc_seq *sp, + void *arg), + void *arg, u32 timer_msec); + +/* + * send a frame using existing sequence and exchange. + */ +int fc_seq_send(struct fc_lport *lp, struct fc_seq *sp, struct fc_frame *fp); + +/* + * Send ELS response using mainly infomation + * in exchange and sequence in EM layer. + */ +void fc_seq_els_rsp_send(struct fc_seq *sp, enum fc_els_cmd els_cmd, + struct fc_seq_els_data *els_data); + +/* + * This function is for seq_exch_abort function pointer in + * struct libfc_function_template, see comment block on + * seq_exch_abort for description of this function. + */ +int fc_seq_exch_abort(const struct fc_seq *req_sp, unsigned int timer_msec); + +/* + * Indicate that an exchange/sequence tuple is complete and the memory + * allocated for the related objects may be freed. + */ +void fc_exch_done(struct fc_seq *sp); + +/* + * Assigns a EM and XID for a frame and then allocates + * a new exchange and sequence pair. + * The fp can be used to determine free XID. + */ +struct fc_exch *fc_exch_get(struct fc_lport *lp, struct fc_frame *fp); + +/* + * Allocate a new exchange and sequence pair. + * if ex_id is zero then next free exchange id + * from specified exchange manger mp will be assigned. + */ +struct fc_exch *fc_exch_alloc(struct fc_exch_mgr *mp, + struct fc_frame *fp, u16 ex_id); +/* + * Start a new sequence on the same exchange as the supplied sequence. + */ +struct fc_seq *fc_seq_start_next(struct fc_seq *sp); + +/* + * Reset an exchange manager, completing all sequences and exchanges. + * If s_id is non-zero, reset only exchanges originating from that FID. + * If d_id is non-zero, reset only exchanges sending to that FID. + */ +void fc_exch_mgr_reset(struct fc_exch_mgr *, u32 s_id, u32 d_id); + +/* + * Functions for fc_functions_template + */ +void fc_get_host_speed(struct Scsi_Host *shost); +void fc_get_host_port_type(struct Scsi_Host *shost); +void fc_get_host_port_state(struct Scsi_Host *shost); +void fc_set_rport_loss_tmo(struct fc_rport *rport, u32 timeout); +struct fc_host_statistics *fc_get_host_stats(struct Scsi_Host *); + +/* + * module setup functions. + */ +int fc_setup_exch_mgr(void); +void fc_destroy_exch_mgr(void); +int fc_setup_rport(void); +void fc_destroy_rport(void); + +#endif /* _LIBFC_H_ */ |