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Diffstat (limited to 'include/scsi/libfc.h')
| -rw-r--r-- | include/scsi/libfc.h | 1153 |
1 files changed, 1153 insertions, 0 deletions
diff --git a/include/scsi/libfc.h b/include/scsi/libfc.h new file mode 100644 index 000000000..93d14daf0 --- /dev/null +++ b/include/scsi/libfc.h @@ -0,0 +1,1153 @@ +/* + * 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 *); + +/* + * 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_ */ |