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linux/include/scsi/libfc.h
Bart Van Assche 7030fd6261 libfc: Do not invoke the response handler after fc_exch_done() 
While the FCoE initiator driver invokes fc_exch_done() from inside
the libfc response handler, FCoE target drivers typically invoke
fc_exch_done() from outside the libfc response handler. The object
fc_exch.arg points at may disappear as soon as fc_exch_done() has
finished. So it's important not to invoke the response handler
function after fc_exch_done() has finished. Modify libfc such that
this guarantee is provided if fc_exch_done() is invoked from
outside a response handler. This patch fixes a sporadic crash in
FCoE target implementations after a command has been aborted.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Cc: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
2013-09-04 13:45:22 -07:00

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/*
* 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/scsi_bsg_fc.h>
#include <scsi/fc/fc_fcp.h>
#include <scsi/fc/fc_ns.h>
#include <scsi/fc/fc_ms.h>
#include <scsi/fc/fc_els.h>
#include <scsi/fc/fc_gs.h>
#include <scsi/fc_frame.h>
#define FC_FC4_PROV_SIZE (FC_TYPE_FCP + 1) /* size of tables */
/*
* libfc error codes
*/
#define FC_NO_ERR 0 /* no error */
#define FC_EX_TIMEOUT 1 /* Exchange timeout */
#define FC_EX_CLOSED 2 /* Exchange closed */
/**
* enum fc_lport_state - Local port states
* @LPORT_ST_DISABLED: Disabled
* @LPORT_ST_FLOGI: Fabric login (FLOGI) sent
* @LPORT_ST_DNS: Waiting for name server remote port to become ready
* @LPORT_ST_RPN_ID: Register port name by ID (RPN_ID) sent
* @LPORT_ST_RFT_ID: Register Fibre Channel types by ID (RFT_ID) sent
* @LPORT_ST_RFF_ID: Register FC-4 Features by ID (RFF_ID) sent
* @LPORT_ST_FDMI: Waiting for mgmt server rport to become ready
* @LPORT_ST_RHBA:
* @LPORT_ST_SCR: State Change Register (SCR) sent
* @LPORT_ST_READY: Ready for use
* @LPORT_ST_LOGO: Local port logout (LOGO) sent
* @LPORT_ST_RESET: Local port reset
*/
enum fc_lport_state {
LPORT_ST_DISABLED = 0,
LPORT_ST_FLOGI,
LPORT_ST_DNS,
LPORT_ST_RNN_ID,
LPORT_ST_RSNN_NN,
LPORT_ST_RSPN_ID,
LPORT_ST_RFT_ID,
LPORT_ST_RFF_ID,
LPORT_ST_FDMI,
LPORT_ST_RHBA,
LPORT_ST_RPA,
LPORT_ST_DHBA,
LPORT_ST_DPRT,
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 - Remote port states
* @RPORT_ST_INIT: Initialized
* @RPORT_ST_FLOGI: Waiting for FLOGI completion for point-to-multipoint
* @RPORT_ST_PLOGI_WAIT: Waiting for peer to login for point-to-multipoint
* @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_ADISC: Discover Address sent
* @RPORT_ST_DELETE: Remote port being deleted
*/
enum fc_rport_state {
RPORT_ST_INIT,
RPORT_ST_FLOGI,
RPORT_ST_PLOGI_WAIT,
RPORT_ST_PLOGI,
RPORT_ST_PRLI,
RPORT_ST_RTV,
RPORT_ST_READY,
RPORT_ST_ADISC,
RPORT_ST_DELETE,
};
/**
* 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
* @rport_work: Work struct for starting the rport state machine
* @port_id: Port ID of the discovered port
*/
struct fc_disc_port {
struct fc_lport *lp;
struct list_head peers;
struct work_struct rport_work;
u32 port_id;
};
/**
* enum fc_rport_event - Remote port events
* @RPORT_EV_NONE: No event
* @RPORT_EV_READY: Remote port is ready for use
* @RPORT_EV_FAILED: State machine failed, remote port is not ready
* @RPORT_EV_STOP: Remote port has been stopped
* @RPORT_EV_LOGO: Remote port logout (LOGO) sent
*/
enum fc_rport_event {
RPORT_EV_NONE = 0,
RPORT_EV_READY,
RPORT_EV_FAILED,
RPORT_EV_STOP,
RPORT_EV_LOGO
};
struct fc_rport_priv;
/**
* struct fc_rport_operations - Operations for a remote port
* @event_callback: Function to be called for remote port events
*/
struct fc_rport_operations {
void (*event_callback)(struct fc_lport *, struct fc_rport_priv *,
enum fc_rport_event);
};
/**
* struct fc_rport_libfc_priv - libfc internal information about a remote port
* @local_port: The associated local port
* @rp_state: Indicates READY for I/O or DELETE when blocked
* @flags: REC and RETRY supported flags
* @e_d_tov: Error detect timeout value (in msec)
* @r_a_tov: Resource allocation timeout value (in msec)
*/
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)
#define FC_RP_STARTED (1 << 2)
#define FC_RP_FLAGS_CONF_REQ (1 << 3)
unsigned int e_d_tov;
unsigned int r_a_tov;
};
/**
* struct fc_rport_priv - libfc remote port and discovery info
* @local_port: The associated local port
* @rport: The FC transport remote port
* @kref: Reference counter
* @rp_state: Enumeration that tracks progress of PLOGI, PRLI,
* and RTV exchanges
* @ids: The remote port identifiers and roles
* @flags: STARTED, REC and RETRY_SUPPORTED flags
* @max_seq: Maximum number of concurrent sequences
* @disc_id: The discovery identifier
* @maxframe_size: The maximum frame size
* @retries: The retry count for the current state
* @major_retries: The retry count for the entire PLOGI/PRLI state machine
* @e_d_tov: Error detect timeout value (in msec)
* @r_a_tov: Resource allocation timeout value (in msec)
* @rp_mutex: The mutex that protects the remote port
* @retry_work: Handle for retries
* @event_callback: Callback when READY, FAILED or LOGO states complete
* @prli_count: Count of open PRLI sessions in providers
* @rcu: Structure used for freeing in an RCU-safe manner
*/
struct fc_rport_priv {
struct fc_lport *local_port;
struct fc_rport *rport;
struct kref kref;
enum fc_rport_state rp_state;
struct fc_rport_identifiers ids;
u16 flags;
u16 max_seq;
u16 disc_id;
u16 maxframe_size;
unsigned int retries;
unsigned int major_retries;
unsigned int e_d_tov;
unsigned int r_a_tov;
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;
u32 supported_classes;
u16 prli_count;
struct rcu_head rcu;
u16 sp_features;
u8 spp_type;
void (*lld_event_callback)(struct fc_lport *,
struct fc_rport_priv *,
enum fc_rport_event);
};
/**
* struct fc_stats - fc stats structure
* @SecondsSinceLastReset: Seconds since the last reset
* @TxFrames: Number of transmitted frames
* @TxWords: Number of transmitted words
* @RxFrames: Number of received frames
* @RxWords: Number of received words
* @ErrorFrames: Number of received error frames
* @DumpedFrames: Number of dumped frames
* @FcpPktAllocFails: Number of fcp packet allocation failures
* @FcpPktAborts: Number of fcp packet aborts
* @FcpFrameAllocFails: Number of fcp frame allocation failures
* @LinkFailureCount: Number of link failures
* @LossOfSignalCount: Number for signal losses
* @InvalidTxWordCount: Number of invalid transmitted words
* @InvalidCRCCount: Number of invalid CRCs
* @InputRequests: Number of input requests
* @OutputRequests: Number of output requests
* @ControlRequests: Number of control requests
* @InputBytes: Number of received bytes
* @OutputBytes: Number of transmitted bytes
* @VLinkFailureCount: Number of virtual link failures
* @MissDiscAdvCount: Number of missing FIP discovery advertisement
*/
struct fc_stats {
u64 SecondsSinceLastReset;
u64 TxFrames;
u64 TxWords;
u64 RxFrames;
u64 RxWords;
u64 ErrorFrames;
u64 DumpedFrames;
u64 FcpPktAllocFails;
u64 FcpPktAborts;
u64 FcpFrameAllocFails;
u64 LinkFailureCount;
u64 LossOfSignalCount;
u64 InvalidTxWordCount;
u64 InvalidCRCCount;
u64 InputRequests;
u64 OutputRequests;
u64 ControlRequests;
u64 InputBytes;
u64 OutputBytes;
u64 VLinkFailureCount;
u64 MissDiscAdvCount;
};
/**
* struct fc_seq_els_data - ELS data used for passing ELS specific responses
* @reason: The reason for rejection
* @explan: The explanation of the rejection
*
* Mainly used by the exchange manager layer.
*/
struct fc_seq_els_data {
enum fc_els_rjt_reason reason;
enum fc_els_rjt_explan explan;
};
/**
* struct fc_fcp_pkt - FCP request structure (one for each scsi_cmnd request)
* @lp: The associated local port
* @state: The state of the I/O
* @ref_cnt: Reference count
* @scsi_pkt_lock: Lock to protect the SCSI packet (must be taken before the
* host_lock if both are to be held at the same time)
* @cmd: The SCSI command (set and clear with the host_lock held)
* @list: Tracks queued commands (accessed with the host_lock held)
* @timer: The command timer
* @tm_done: Completion indicator
* @wait_for_comp: Indicator to wait for completion of the I/O (in jiffies)
* @data_len: The length of the data
* @cdb_cmd: The CDB command
* @xfer_len: The transfer length
* @xfer_ddp: Indicates if this transfer used DDP (XID of the exchange
* will be set here if DDP was setup)
* @xfer_contig_end: The offset into the buffer if the buffer is contiguous
* (Tx and Rx)
* @max_payload: The maximum payload size (in bytes)
* @io_status: SCSI result (upper 24 bits)
* @cdb_status: CDB status
* @status_code: FCP I/O status
* @scsi_comp_flags: Completion flags (bit 3 Underrun bit 2: overrun)
* @req_flags: Request flags (bit 0: read bit:1 write)
* @scsi_resid: SCSI residule length
* @rport: The remote port that the SCSI command is targeted at
* @seq_ptr: The sequence that will carry the SCSI command
* @recov_retry: Number of recovery retries
* @recov_seq: The sequence for REC or SRR
*/
struct fc_fcp_pkt {
spinlock_t scsi_pkt_lock;
atomic_t ref_cnt;
/* SCSI command and data transfer information */
u32 data_len;
/* SCSI I/O related information */
struct scsi_cmnd *cmd;
struct list_head list;
/* Housekeeping information */
struct fc_lport *lp;
u8 state;
/* SCSI/FCP return status */
u8 cdb_status;
u8 status_code;
u8 scsi_comp_flags;
u32 io_status;
u32 req_flags;
u32 scsi_resid;
/* Transport related veriables */
size_t xfer_len;
struct fcp_cmnd cdb_cmd;
u32 xfer_contig_end;
u16 max_payload;
u16 xfer_ddp;
/* Associated structures */
struct fc_rport *rport;
struct fc_seq *seq_ptr;
/* Timeout/error related information */
struct timer_list timer;
int wait_for_comp;
u32 recov_retry;
struct fc_seq *recov_seq;
struct completion tm_done;
} ____cacheline_aligned_in_smp;
/*
* 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;
struct fc_exch_mgr_anchor;
extern u16 fc_cpu_mask; /* cpu mask for possible cpus */
/**
* struct fc_seq - FC sequence
* @id: The sequence ID
* @ssb_stat: Status flags for the sequence status block (SSB)
* @cnt: Number of frames sent so far
* @rec_data: FC-4 value for REC
*/
struct fc_seq {
u8 id;
u16 ssb_stat;
u16 cnt;
u32 rec_data;
};
#define FC_EX_DONE (1 << 0) /* ep is completed */
#define FC_EX_RST_CLEANUP (1 << 1) /* reset is forcing completion */
/**
* struct fc_exch - Fibre Channel Exchange
* @em: Exchange manager
* @pool: Exchange pool
* @state: The exchange's state
* @xid: The exchange ID
* @ex_list: Handle used by the EM to track free exchanges
* @ex_lock: Lock that protects the exchange
* @ex_refcnt: Reference count
* @timeout_work: Handle for timeout handler
* @lp: The local port that this exchange is on
* @oxid: Originator's exchange ID
* @rxid: Responder's exchange ID
* @oid: Originator's FCID
* @sid: Source FCID
* @did: Destination FCID
* @esb_stat: ESB exchange status
* @r_a_tov: Resouce allocation time out value (in msecs)
* @seq_id: The next sequence ID to use
* @encaps: encapsulation information for lower-level driver
* @f_ctl: F_CTL flags for the sequence
* @fh_type: The frame type
* @class: The class of service
* @seq: The sequence in use on this exchange
* @resp_active: Number of tasks that are concurrently executing @resp().
* @resp_task: If @resp_active > 0, either the task executing @resp(), the
* task that has been interrupted to execute the soft-IRQ
* executing @resp() or NULL if more than one task is executing
* @resp concurrently.
* @resp_wq: Waitqueue for the tasks waiting on @resp_active.
* @resp: Callback for responses on this exchange
* @destructor: Called when destroying the exchange
* @arg: Passed as a void pointer to the resp() callback
*
* Locking notes: The ex_lock protects following items:
* state, esb_stat, f_ctl, seq.ssb_stat
* seq_id
* sequence allocation
*/
struct fc_exch {
spinlock_t ex_lock;
atomic_t ex_refcnt;
enum fc_class class;
struct fc_exch_mgr *em;
struct fc_exch_pool *pool;
struct list_head ex_list;
struct fc_lport *lp;
u32 esb_stat;
u8 state;
u8 fh_type;
u8 seq_id;
u8 encaps;
u16 xid;
u16 oxid;
u16 rxid;
u32 oid;
u32 sid;
u32 did;
u32 r_a_tov;
u32 f_ctl;
struct fc_seq seq;
int resp_active;
struct task_struct *resp_task;
wait_queue_head_t resp_wq;
void (*resp)(struct fc_seq *, struct fc_frame *, void *);
void *arg;
void (*destructor)(struct fc_seq *, void *);
struct delayed_work timeout_work;
} ____cacheline_aligned_in_smp;
#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 *, struct fc_frame *);
/*
* Interface to send ELS/CT frames
*
* STATUS: OPTIONAL
*/
struct fc_seq *(*elsct_send)(struct fc_lport *, u32 did,
struct fc_frame *, unsigned int op,
void (*resp)(struct fc_seq *,
struct fc_frame *, void *arg),
void *arg, u32 timer_msec);
/*
* Send the FC frame payload using a new exchange and sequence.
*
* 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 *, struct fc_frame *,
void (*resp)(struct fc_seq *,
struct fc_frame *,
void *),
void (*destructor)(struct fc_seq *,
void *),
void *, 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 *, u16, struct scatterlist *,
unsigned int);
/*
* Completes the DDP transfer and returns the length of data DDPed
* for the given exchange id.
*
* STATUS: OPTIONAL
*/
int (*ddp_done)(struct fc_lport *, u16);
/*
* Sets up the DDP context for a given exchange id on the given
* scatterlist if LLD supports DDP for target.
*
* STATUS: OPTIONAL
*/
int (*ddp_target)(struct fc_lport *, u16, struct scatterlist *,
unsigned int);
/*
* Allow LLD to fill its own Link Error Status Block
*
* STATUS: OPTIONAL
*/
void (*get_lesb)(struct fc_lport *, struct fc_els_lesb *lesb);
/*
* Send a frame using an existing sequence and exchange.
*
* STATUS: OPTIONAL
*/
int (*seq_send)(struct fc_lport *, struct fc_seq *,
struct fc_frame *);
/*
* Send an ELS response using information from the received frame.
*
* STATUS: OPTIONAL
*/
void (*seq_els_rsp_send)(struct fc_frame *, enum fc_els_cmd,
struct fc_seq_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 *,
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 *);
/*
* Start a new sequence on the same exchange/sequence tuple.
*
* STATUS: OPTIONAL
*/
struct fc_seq *(*seq_start_next)(struct fc_seq *);
/*
* Set a response handler for the exchange of the sequence.
*
* STATUS: OPTIONAL
*/
void (*seq_set_resp)(struct fc_seq *sp,
void (*resp)(struct fc_seq *, struct fc_frame *,
void *),
void *arg);
/*
* Assign a sequence for an incoming request frame.
*
* STATUS: OPTIONAL
*/
struct fc_seq *(*seq_assign)(struct fc_lport *, struct fc_frame *);
/*
* Release the reference on the sequence returned by seq_assign().
*
* STATUS: OPTIONAL
*/
void (*seq_release)(struct fc_seq *);
/*
* 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 *, struct fc_frame *);
/*
* Reset the local port.
*
* STATUS: OPTIONAL
*/
int (*lport_reset)(struct fc_lport *);
/*
* Set the local port FC_ID.
*
* This may be provided by the LLD to allow it to be
* notified when the local port is assigned a FC-ID.
*
* The frame, if non-NULL, is the incoming frame with the
* FLOGI LS_ACC or FLOGI, and may contain the granted MAC
* address for the LLD. The frame pointer may be NULL if
* no MAC is associated with this assignment (LOGO or PLOGI).
*
* If FC_ID is non-zero, r_a_tov and e_d_tov must be valid.
*
* Note: this is called with the local port mutex held.
*
* STATUS: OPTIONAL
*/
void (*lport_set_port_id)(struct fc_lport *, u32 port_id,
struct fc_frame *);
/*
* Create a remote port with a given port ID
*
* STATUS: OPTIONAL
*/
struct fc_rport_priv *(*rport_create)(struct fc_lport *, u32);
/*
* 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_priv *);
/*
* 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_priv *);
/*
* Receive a request from a remote port.
*
* STATUS: OPTIONAL
*/
void (*rport_recv_req)(struct fc_lport *, struct fc_frame *);
/*
* lookup an rport by it's port ID.
*
* STATUS: OPTIONAL
*/
struct fc_rport_priv *(*rport_lookup)(const struct fc_lport *, u32);
/*
* Destroy an rport after final kref_put().
* The argument is a pointer to the kref inside the fc_rport_priv.
*/
void (*rport_destroy)(struct kref *);
/*
* Callback routine after the remote port is logged in
*
* STATUS: OPTIONAL
*/
void (*rport_event_callback)(struct fc_lport *,
struct fc_rport_priv *,
enum fc_rport_event);
/*
* 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 *, struct fc_fcp_pkt *,
void (*resp)(struct fc_seq *, struct fc_frame *,
void *));
/*
* Cleanup the FCP layer, used during link down and reset
*
* STATUS: OPTIONAL
*/
void (*fcp_cleanup)(struct fc_lport *);
/*
* Abort all I/O on a local port
*
* STATUS: OPTIONAL
*/
void (*fcp_abort_io)(struct fc_lport *);
/*
* Receive a request for the discovery layer.
*
* STATUS: OPTIONAL
*/
void (*disc_recv_req)(struct fc_lport *, struct fc_frame *);
/*
* 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 *);
};
/**
* struct fc_disc - Discovery context
* @retry_count: Number of retries
* @pending: 1 if discovery is pending, 0 if not
* @requested: 1 if discovery has been requested, 0 if not
* @seq_count: Number of sequences used for discovery
* @buf_len: Length of the discovery buffer
* @disc_id: Discovery ID
* @rports: List of discovered remote ports
* @priv: Private pointer for use by discovery code
* @disc_mutex: Mutex that protects the discovery context
* @partial_buf: Partial name buffer (if names are returned
* in multiple frames)
* @disc_work: handle for delayed work context
* @disc_callback: Callback routine called when discovery completes
*/
struct fc_disc {
unsigned char retry_count;
unsigned char pending;
unsigned char requested;
unsigned short seq_count;
unsigned char buf_len;
u16 disc_id;
struct list_head rports;
void *priv;
struct mutex disc_mutex;
struct fc_gpn_ft_resp partial_buf;
struct delayed_work disc_work;
void (*disc_callback)(struct fc_lport *,
enum fc_disc_event);
};
/*
* Local port notifier and events.
*/
extern struct blocking_notifier_head fc_lport_notifier_head;
enum fc_lport_event {
FC_LPORT_EV_ADD,
FC_LPORT_EV_DEL,
};
/**
* struct fc_lport - Local port
* @host: The SCSI host associated with a local port
* @ema_list: Exchange manager anchor list
* @dns_rdata: The directory server remote port
* @ms_rdata: The management server remote port
* @ptp_rdata: Point to point remote port
* @scsi_priv: FCP layer internal data
* @disc: Discovery context
* @vports: Child vports if N_Port
* @vport: Parent vport if VN_Port
* @tt: Libfc function template
* @link_up: Link state (1 = link up, 0 = link down)
* @qfull: Queue state (1 queue is full, 0 queue is not full)
* @state: Identifies the state
* @boot_time: Timestamp indicating when the local port came online
* @host_stats: SCSI host statistics
* @stats: FC local port stats (TODO separate libfc LLD stats)
* @retry_count: Number of retries in the current state
* @port_id: FC Port ID
* @wwpn: World Wide Port Name
* @wwnn: World Wide Node Name
* @service_params: Common service parameters
* @e_d_tov: Error detection timeout value
* @r_a_tov: Resouce allocation timeout value
* @rnid_gen: RNID information
* @sg_supp: Indicates if scatter gather is supported
* @seq_offload: Indicates if sequence offload is supported
* @crc_offload: Indicates if CRC offload is supported
* @lro_enabled: Indicates if large receive offload is supported
* @does_npiv: Supports multiple vports
* @npiv_enabled: Switch/fabric allows NPIV
* @mfs: The maximum Fibre Channel payload size
* @max_retry_count: The maximum retry attempts
* @max_rport_retry_count: The maximum remote port retry attempts
* @rport_priv_size: Size needed by driver after struct fc_rport_priv
* @lro_xid: The maximum XID for LRO
* @lso_max: The maximum large offload send size
* @fcts: FC-4 type mask
* @lp_mutex: Mutex to protect the local port
* @list: Linkage on list of vport peers
* @retry_work: Handle to local port for delayed retry context
* @prov: Pointers available for use by passive FC-4 providers
* @lport_list: Linkage on module-wide list of local ports
*/
struct fc_lport {
/* Associations */
struct Scsi_Host *host;
struct list_head ema_list;
struct fc_rport_priv *dns_rdata;
struct fc_rport_priv *ms_rdata;
struct fc_rport_priv *ptp_rdata;
void *scsi_priv;
struct fc_disc disc;
/* Virtual port information */
struct list_head vports;
struct fc_vport *vport;
/* 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 fc_stats __percpu *stats;
u8 retry_count;
/* Fabric information */
u32 port_id;
u64 wwpn;
u64 wwnn;
unsigned int service_params;
unsigned int e_d_tov;
unsigned int r_a_tov;
struct fc_els_rnid_gen rnid_gen;
/* Capabilities */
u32 sg_supp:1;
u32 seq_offload:1;
u32 crc_offload:1;
u32 lro_enabled:1;
u32 does_npiv:1;
u32 npiv_enabled:1;
u32 point_to_multipoint:1;
u32 fdmi_enabled:1;
u32 mfs;
u8 max_retry_count;
u8 max_rport_retry_count;
u16 rport_priv_size;
u16 link_speed;
u16 link_supported_speeds;
u16 lro_xid;
unsigned int lso_max;
struct fc_ns_fts fcts;
/* Miscellaneous */
struct mutex lp_mutex;
struct list_head list;
struct delayed_work retry_work;
void *prov[FC_FC4_PROV_SIZE];
struct list_head lport_list;
};
/**
* struct fc4_prov - FC-4 provider registration
* @prli: Handler for incoming PRLI
* @prlo: Handler for session reset
* @recv: Handler for incoming request
* @module: Pointer to module. May be NULL.
*/
struct fc4_prov {
int (*prli)(struct fc_rport_priv *, u32 spp_len,
const struct fc_els_spp *spp_in,
struct fc_els_spp *spp_out);
void (*prlo)(struct fc_rport_priv *);
void (*recv)(struct fc_lport *, struct fc_frame *);
struct module *module;
};
/*
* Register FC-4 provider with libfc.
*/
int fc_fc4_register_provider(enum fc_fh_type type, struct fc4_prov *);
void fc_fc4_deregister_provider(enum fc_fh_type type, struct fc4_prov *);
/*
* FC_LPORT HELPER FUNCTIONS
*****************************/
/**
* fc_lport_test_ready() - Determine if a local port is in the READY state
* @lport: The local port to test
*/
static inline int fc_lport_test_ready(struct fc_lport *lport)
{
return lport->state == LPORT_ST_READY;
}
/**
* fc_set_wwnn() - Set the World Wide Node Name of a local port
* @lport: The local port whose WWNN is to be set
* @wwnn: The new WWNN
*/
static inline void fc_set_wwnn(struct fc_lport *lport, u64 wwnn)
{
lport->wwnn = wwnn;
}
/**
* fc_set_wwpn() - Set the World Wide Port Name of a local port
* @lport: The local port whose WWPN is to be set
* @wwnn: The new WWPN
*/
static inline void fc_set_wwpn(struct fc_lport *lport, u64 wwnn)
{
lport->wwpn = wwnn;
}
/**
* fc_lport_state_enter() - Change a local port's state
* @lport: The local port whose state is to change
* @state: The new state
*/
static inline void fc_lport_state_enter(struct fc_lport *lport,
enum fc_lport_state state)
{
if (state != lport->state)
lport->retry_count = 0;
lport->state = state;
}
/**
* fc_lport_init_stats() - Allocate per-CPU statistics for a local port
* @lport: The local port whose statistics are to be initialized
*/
static inline int fc_lport_init_stats(struct fc_lport *lport)
{
lport->stats = alloc_percpu(struct fc_stats);
if (!lport->stats)
return -ENOMEM;
return 0;
}
/**
* fc_lport_free_stats() - Free memory for a local port's statistics
* @lport: The local port whose statistics are to be freed
*/
static inline void fc_lport_free_stats(struct fc_lport *lport)
{
free_percpu(lport->stats);
}
/**
* lport_priv() - Return the private data from a local port
* @lport: The local port whose private data is to be retreived
*/
static inline void *lport_priv(const struct fc_lport *lport)
{
return (void *)(lport + 1);
}
/**
* libfc_host_alloc() - Allocate a Scsi_Host with room for a local port and
* LLD private data
* @sht: The SCSI host template
* @priv_size: Size of private data
*
* Returns: libfc lport
*/
static inline struct fc_lport *
libfc_host_alloc(struct scsi_host_template *sht, int priv_size)
{
struct fc_lport *lport;
struct Scsi_Host *shost;
shost = scsi_host_alloc(sht, sizeof(*lport) + priv_size);
if (!shost)
return NULL;
lport = shost_priv(shost);
lport->host = shost;
INIT_LIST_HEAD(&lport->ema_list);
INIT_LIST_HEAD(&lport->vports);
return lport;
}
/*
* 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;
}
/*
* LOCAL PORT LAYER
*****************************/
int fc_lport_init(struct fc_lport *);
int fc_lport_destroy(struct fc_lport *);
int fc_fabric_logoff(struct fc_lport *);
int fc_fabric_login(struct fc_lport *);
void __fc_linkup(struct fc_lport *);
void fc_linkup(struct fc_lport *);
void __fc_linkdown(struct fc_lport *);
void fc_linkdown(struct fc_lport *);
void fc_vport_setlink(struct fc_lport *);
void fc_vports_linkchange(struct fc_lport *);
int fc_lport_config(struct fc_lport *);
int fc_lport_reset(struct fc_lport *);
int fc_set_mfs(struct fc_lport *, u32 mfs);
struct fc_lport *libfc_vport_create(struct fc_vport *, int privsize);
struct fc_lport *fc_vport_id_lookup(struct fc_lport *, u32 port_id);
int fc_lport_bsg_request(struct fc_bsg_job *);
void fc_lport_set_local_id(struct fc_lport *, u32 port_id);
void fc_lport_iterate(void (*func)(struct fc_lport *, void *), void *);
/*
* REMOTE PORT LAYER
*****************************/
int fc_rport_init(struct fc_lport *);
void fc_rport_terminate_io(struct fc_rport *);
/*
* DISCOVERY LAYER
*****************************/
void fc_disc_init(struct fc_lport *);
void fc_disc_config(struct fc_lport *, void *);
static inline struct fc_lport *fc_disc_lport(struct fc_disc *disc)
{
return container_of(disc, struct fc_lport, disc);
}
/*
* FCP LAYER
*****************************/
int fc_fcp_init(struct fc_lport *);
void fc_fcp_destroy(struct fc_lport *);
/*
* SCSI INTERACTION LAYER
*****************************/
int fc_queuecommand(struct Scsi_Host *, struct scsi_cmnd *);
int fc_eh_abort(struct scsi_cmnd *);
int fc_eh_device_reset(struct scsi_cmnd *);
int fc_eh_host_reset(struct scsi_cmnd *);
int fc_slave_alloc(struct scsi_device *);
int fc_change_queue_depth(struct scsi_device *, int qdepth, int reason);
int fc_change_queue_type(struct scsi_device *, int tag_type);
/*
* ELS/CT interface
*****************************/
int fc_elsct_init(struct fc_lport *);
struct fc_seq *fc_elsct_send(struct fc_lport *, u32 did,
struct fc_frame *,
unsigned int op,
void (*resp)(struct fc_seq *,
struct fc_frame *,
void *arg),
void *arg, u32 timer_msec);
void fc_lport_flogi_resp(struct fc_seq *, struct fc_frame *, void *);
void fc_lport_logo_resp(struct fc_seq *, struct fc_frame *, void *);
void fc_fill_reply_hdr(struct fc_frame *, const struct fc_frame *,
enum fc_rctl, u32 parm_offset);
void fc_fill_hdr(struct fc_frame *, const struct fc_frame *,
enum fc_rctl, u32 f_ctl, u16 seq_cnt, u32 parm_offset);
/*
* EXCHANGE MANAGER LAYER
*****************************/
int fc_exch_init(struct fc_lport *);
void fc_exch_update_stats(struct fc_lport *lport);
struct fc_exch_mgr_anchor *fc_exch_mgr_add(struct fc_lport *,
struct fc_exch_mgr *,
bool (*match)(struct fc_frame *));
void fc_exch_mgr_del(struct fc_exch_mgr_anchor *);
int fc_exch_mgr_list_clone(struct fc_lport *src, struct fc_lport *dst);
struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *, enum fc_class class,
u16 min_xid, u16 max_xid,
bool (*match)(struct fc_frame *));
void fc_exch_mgr_free(struct fc_lport *);
void fc_exch_recv(struct fc_lport *, struct fc_frame *);
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 *);
void fc_get_host_port_state(struct Scsi_Host *);
void fc_set_rport_loss_tmo(struct fc_rport *, u32 timeout);
struct fc_host_statistics *fc_get_host_stats(struct Scsi_Host *);
#endif /* _LIBFC_H_ */
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