/*
* 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 <linux/percpu.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
*/
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;
u16 xfer_ddp; /* this xfer is ddped */
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 */
};
/*
* FC_FCP HELPER FUNCTIONS
*****************************/
static inline bool fc_fcp_is_read(const struct fc_fcp_pkt *fsp)
{
if (fsp && fsp->cmd)
return fsp->cmd->sc_data_direction == DMA_FROM_DEVICE;
return false;
}
/*
* 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 {
/*
* Interface to send a FC frame
*
* STATUS: REQUIRED
*/
int (*frame_send)(struct fc_lport *lp, struct fc_frame *fp);
/*
* Interface to send ELS/CT frames
*
* STATUS: OPTIONAL
*/
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);
/*
* 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.
*
* STATUS: OPTIONAL
*/
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);
/*
* Sets up the DDP context for a given exchange id on the given
* scatterlist if LLD supports DDP for large receive.
*
* STATUS: OPTIONAL
*/
int (*ddp_setup)(struct fc_lport *lp, u16 xid,
struct scatterlist *sgl, unsigned int sgc);
/*
* Completes the DDP transfer and returns the length of data DDPed
* for the given exchange id.
*
* STATUS: OPTIONAL
*/
int (*ddp_done)(struct fc_lport *lp, u16 xid);
/*
* Send a frame using an existing sequence and exchange.
*
* STATUS: OPTIONAL
*/
int (*seq_send)(struct fc_lport *lp, struct fc_seq *sp,
struct fc_frame *fp);
/*
* Send an ELS response using infomation from a previous
* exchange and sequence.
*
* STATUS: OPTIONAL
*/
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.
*
* STATUS: OPTIONAL
*/
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.
*
* STATUS: OPTIONAL
*/
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.
*
* STATUS: OPTIONAL
*/
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().
*
* STATUS: OPTIONAL
*/
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.
*
* STATUS: OPTIONAL
*/
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.
*
* STATUS: OPTIONAL
*/
void (*exch_mgr_reset)(struct fc_lport *,
u32 s_id, u32 d_id);
/*
* Flush the rport work queue. Generally used before shutdown.
*
* STATUS: OPTIONAL
*/
void (*rport_flush_queue)(void);
/*
* Receive a frame for a local port.
*
* STATUS: OPTIONAL
*/
void (*lport_recv)(struct fc_lport *lp, struct fc_seq *sp,
struct fc_frame *fp);
/*
* Reset the local port.
*
* STATUS: OPTIONAL
*/
int (*lport_reset)(struct fc_lport *);
/*
* Create a remote port
*/
struct fc_rport *(*rport_create)(struct fc_disc_port *);
/*
* 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
*
* STATUS: OPTIONAL
*/
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.
*
* STATUS: OPTIONAL
*/
int (*rport_logoff)(struct fc_rport *rport);
/*
* Recieve a request from a remote port.
*
* STATUS: OPTIONAL
*/
void (*rport_recv_req)(struct fc_seq *, struct fc_frame *,
struct fc_rport *);
/*
* lookup an rport by it's port ID.
*
* STATUS: OPTIONAL
*/
struct fc_rport *(*rport_lookup)(const struct fc_lport *, u32);
/*
* 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.
*
* STATUS: OPTIONAL
*/
int (*fcp_cmd_send)(struct fc_lport *lp, struct fc_fcp_pkt *fsp,
void (*resp)(struct fc_seq *, struct fc_frame *fp,
void *arg));
/*
* Cleanup the FCP layer, used durring link down and reset
*
* STATUS: OPTIONAL
*/
void (*fcp_cleanup)(struct fc_lport *lp);
/*
* Abort all I/O on a local port
*
* STATUS: OPTIONAL
*/
void (*fcp_abort_io)(struct fc_lport *lp);
/*
* Receive a request for the discovery layer.
*
* STATUS: OPTIONAL
*/
void (*disc_recv_req)(struct fc_seq *,
struct fc_frame *, struct fc_lport *);
/*
* Start discovery for a local port.
*
* STATUS: OPTIONAL
*/
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
*
* STATUS: OPTIONAL
*/
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
*
* STATUS: OPTIONAL
*/
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 list_head rogue_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;
u8 link_up;
u8 qfull;
enum fc_lport_state state;
unsigned long boot_time;
struct fc_host_statistics host_stats;
struct fcoe_dev_stats *dev_stats;
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;
u8 max_rport_retry_count;
u16 link_speed;
u16 link_supported_speeds;
u16 lro_xid; /* max xid for fcoe lro */
unsigned int lso_max; /* max large send size */
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 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;
}
static inline int fc_lport_init_stats(struct fc_lport *lp)
{
/* allocate per cpu stats block */
lp->dev_stats = alloc_percpu(struct fcoe_dev_stats);
if (!lp->dev_stats)
return -ENOMEM;
return 0;
}
static inline void fc_lport_free_stats(struct fc_lport *lp)
{
free_percpu(lp->dev_stats);
}
static inline struct fcoe_dev_stats *fc_lport_get_stats(struct fc_lport *lp)
{
return per_cpu_ptr(lp->dev_stats, smp_processor_id());
}
static inline void *lport_priv(const struct fc_lport *lp)
{
return (void *)(lp + 1);
}
/**
* libfc_host_alloc() - Allocate a Scsi_Host with room for the fc_lport
* @sht: ptr to the scsi host templ
* @priv_size: size of private data after fc_lport
*
* Returns: ptr to Scsi_Host
*/
static inline struct Scsi_Host *
libfc_host_alloc(struct scsi_host_template *sht, int priv_size)
{
return scsi_host_alloc(sht, sizeof(struct fc_lport) + priv_size);
}
/*
* 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 *);
/*
* 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 *);
/*
* Set up direct-data placement for this I/O request
*/
void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid);
/*
* 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_lport *, 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_ */
