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authorRobert Love <robert.w.love@intel.com>2009-11-03 11:47:39 -0800
committerJames Bottomley <James.Bottomley@suse.de>2009-12-04 12:01:07 -0600
commit3a3b42bf89a9b90ae9ed2c57fdc378e5473a0ef9 (patch)
tree6d41d669a3c7b4a3bb5219ded856251c148e7ab6 /include/scsi
parenta51ab39606042e76a483547620699530caa12c40 (diff)
downloadlinux-linaro-android-3a3b42bf89a9b90ae9ed2c57fdc378e5473a0ef9.tar.gz
[SCSI] libfc: Formatting cleanups across libfc
This patch makes a variety of cleanup changes to all libfc files. This patch adds kernel-doc headers to all functions lacking them and attempts to better format existing headers. It also add kernel-doc headers to structures. This patch ensures that the current naming conventions for local ports, remote ports and remote port private data is upheld in the following manner. struct instance (i.e. variable name) -------------------------------------------------- fc_lport lport fc_rport rport fc_rport_libfc_priv rpriv fc_rport_priv rdata I also renamed dns_rp and ptp_rp to dns_rdata and ptp_rdata respectively. I used emacs 'indent-region' and 'tabify' on all libfc files to correct spacing alignments. I feel sorry for anyone attempting to review this patch. Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to 'include/scsi')
-rw-r--r--include/scsi/libfc.h994
1 files changed, 505 insertions, 489 deletions
diff --git a/include/scsi/libfc.h b/include/scsi/libfc.h
index 54df9fe00c1..310d8a22b72 100644
--- a/include/scsi/libfc.h
+++ b/include/scsi/libfc.h
@@ -55,8 +55,17 @@
p[2] = ((v) & 0xFF); \
} while (0)
-/*
- * FC HBA status
+/**
+ * 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_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,
@@ -78,16 +87,28 @@ enum fc_disc_event {
DISC_EV_FAILED
};
+/**
+ * enum fc_rport_state - Remote port states
+ * @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: Remote port logout (LOGO) sent
+ * @RPORT_ST_ADISC: Discover Address sent
+ * @RPORT_ST_DELETE: Remote port being deleted
+ * @RPORT_ST_RESTART: Remote port being deleted and will restart
+*/
enum fc_rport_state {
- 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 */
- RPORT_ST_ADISC, /* Discover Address sent */
- RPORT_ST_DELETE, /* port being deleted */
- RPORT_ST_RESTART, /* remote port being deleted and will restart */
+ RPORT_ST_INIT,
+ RPORT_ST_PLOGI,
+ RPORT_ST_PRLI,
+ RPORT_ST_RTV,
+ RPORT_ST_READY,
+ RPORT_ST_LOGO,
+ RPORT_ST_ADISC,
+ RPORT_ST_DELETE,
+ RPORT_ST_RESTART,
};
/**
@@ -98,12 +119,20 @@ enum fc_rport_state {
* @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;
+ 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,
@@ -114,6 +143,10 @@ enum fc_rport_event {
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);
@@ -121,11 +154,11 @@ struct fc_rport_operations {
/**
* struct fc_rport_libfc_priv - libfc internal information about a remote port
- * @local_port: Fibre Channel host port instance
- * @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)
+ * @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;
@@ -138,47 +171,64 @@ struct fc_rport_libfc_priv {
};
/**
- * struct fc_rport_priv - libfc rport and discovery info about a remote port
- * @local_port: Fibre Channel host port instance
- * @rport: transport remote port
- * @kref: reference counter
- * @rp_state: state tracks progress of PLOGI, PRLI, and RTV exchanges
- * @ids: remote port identifiers and roles
- * @flags: REC and RETRY supported flags
- * @max_seq: maximum number of concurrent sequences
- * @disc_id: discovery identifier
- * @maxframe_size: maximum frame size
- * @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_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: 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
+ * @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
*/
struct fc_rport_priv {
- struct fc_lport *local_port;
- struct fc_rport *rport;
- struct kref kref;
- enum fc_rport_state rp_state;
+ 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 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 flags;
+ u16 max_seq;
+ u16 disc_id;
+ u16 maxframe_size;
+ unsigned int 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;
};
-/*
- * fcoe stats structure
+/**
+ * struct fcoe_dev_stats - fcoe 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
+ * @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
+ * @InputMegabytes: Number of received megabytes
+ * @OutputMegabytes: Number of transmitted megabytes
*/
struct fcoe_dev_stats {
u64 SecondsSinceLastReset;
@@ -199,10 +249,13 @@ struct fcoe_dev_stats {
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 - ELS data used for passing ELS specific responses
+ * @fp: The ELS frame
+ * @reason: The reason for rejection
+ * @explan: The explaination of the rejection
+ *
+ * Mainly used by the exchange manager layer.
*/
struct fc_seq_els_data {
struct fc_frame *fp;
@@ -210,77 +263,87 @@ struct fc_seq_els_data {
enum fc_els_rjt_explan explan;
};
-/*
- * FCP request structure, one for each scsi cmd request
+/**
+ * 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
+ * @tgt_flags: Target's flags
+ * @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)
+ * @start_time: Timestamp indicating the start of the I/O (in jiffies)
+ * @end_time: Timestamp indicating the end of the I/O (in jiffies)
+ * @last_pkt_time: Timestamp of the last frame received (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 {
- /*
- * 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 */
+ /* Housekeeping information */
+ struct fc_lport *lp;
+ u16 state;
+ u16 tgt_flags;
+ atomic_t ref_cnt;
+ spinlock_t scsi_pkt_lock;
+
+ /* SCSI I/O related information */
+ struct scsi_cmnd *cmd;
+ struct list_head list;
+
+ /* Timeout related information */
+ struct timer_list 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 */
+ int wait_for_comp;
+ unsigned long start_time;
+ unsigned long end_time;
+ unsigned long last_pkt_time;
+
+ /* SCSI command and data transfer information */
+ u32 data_len;
+
+ /* Transport related veriables */
+ struct fcp_cmnd cdb_cmd;
+ size_t xfer_len;
+ u16 xfer_ddp;
+ u32 xfer_contig_end;
+ u16 max_payload;
+
+ /* SCSI/FCP return status */
+ u32 io_status;
+ u8 cdb_status;
+ u8 status_code;
+ u8 scsi_comp_flags;
+ u32 req_flags;
+ u32 scsi_resid;
+
+ /* Associated structures */
+ struct fc_rport *rport;
+ struct fc_seq *seq_ptr;
+
+ /* Error Processing information */
+ u8 recov_retry;
+ struct fc_seq *recov_seq;
};
-/*
- * 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
@@ -293,23 +356,51 @@ static inline bool fc_fcp_is_read(const struct fc_fcp_pkt *fsp)
struct fc_exch_mgr;
struct fc_exch_mgr_anchor;
-extern u16 fc_cpu_mask; /* cpu mask for possible cpus */
+extern u16 fc_cpu_mask; /* cpu mask for possible cpus */
-/*
- * Sequence.
+/**
+ * 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; /* 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 */
+ 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 */
-/*
- * Exchange.
+/**
+ * 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
+ * @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: 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
@@ -317,76 +408,59 @@ struct fc_seq {
* sequence allocation
*/
struct fc_exch {
- struct fc_exch_mgr *em; /* exchange manager */
- struct fc_exch_pool *pool; /* per cpu exches pool */
- 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;
+ struct fc_exch_mgr *em;
+ struct fc_exch_pool *pool;
+ u32 state;
+ u16 xid;
+ struct list_head ex_list;
+ spinlock_t ex_lock;
+ atomic_t ex_refcnt;
+ struct delayed_work timeout_work;
+ struct fc_lport *lp;
+ u16 oxid;
+ u16 rxid;
+ u32 oid;
+ u32 sid;
+ u32 did;
+ u32 esb_stat;
+ u32 r_a_tov;
+ u8 seq_id;
+ u32 f_ctl;
+ u8 fh_type;
+ enum fc_class class;
+ struct fc_seq seq;
+
+ void (*resp)(struct fc_seq *, struct fc_frame *, void *);
+ void *arg;
+
+ void (*destructor)(struct fc_seq *, void *);
+
};
#define fc_seq_exch(sp) container_of(sp, struct fc_exch, seq)
-struct libfc_function_template {
+struct libfc_function_template {
/*
* Interface to send a FC frame
*
* STATUS: REQUIRED
*/
- int (*frame_send)(struct fc_lport *lp, struct fc_frame *fp);
+ 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 *lport,
- u32 did,
- struct fc_frame *fp,
- unsigned int op,
+ struct fc_seq *(*elsct_send)(struct fc_lport *, u32 did,
+ struct fc_frame *, unsigned int op,
void (*resp)(struct fc_seq *,
- struct fc_frame *fp,
- void *arg),
+ struct fc_frame *, 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
@@ -407,14 +481,13 @@ struct libfc_function_template {
*
* 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);
+ 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
@@ -422,22 +495,22 @@ struct libfc_function_template {
*
* STATUS: OPTIONAL
*/
- int (*ddp_setup)(struct fc_lport *lp, u16 xid,
- struct scatterlist *sgl, unsigned int sgc);
+ 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 *lp, u16 xid);
+ int (*ddp_done)(struct fc_lport *, u16);
/*
* 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);
+ int (*seq_send)(struct fc_lport *, struct fc_seq *,
+ struct fc_frame *);
/*
* Send an ELS response using infomation from a previous
@@ -445,8 +518,8 @@ struct libfc_function_template {
*
* STATUS: OPTIONAL
*/
- void (*seq_els_rsp_send)(struct fc_seq *sp, enum fc_els_cmd els_cmd,
- struct fc_seq_els_data *els_data);
+ void (*seq_els_rsp_send)(struct fc_seq *, enum fc_els_cmd,
+ struct fc_seq_els_data *);
/*
* Abort an exchange and sequence. Generally called because of a
@@ -458,7 +531,7 @@ struct libfc_function_template {
*
* STATUS: OPTIONAL
*/
- int (*seq_exch_abort)(const struct fc_seq *req_sp,
+ int (*seq_exch_abort)(const struct fc_seq *,
unsigned int timer_msec);
/*
@@ -467,14 +540,14 @@ struct libfc_function_template {
*
* STATUS: OPTIONAL
*/
- void (*exch_done)(struct fc_seq *sp);
+ 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 *sp);
+ struct fc_seq *(*seq_start_next)(struct fc_seq *);
/*
* Reset an exchange manager, completing all sequences and exchanges.
@@ -483,8 +556,7 @@ struct libfc_function_template {
*
* STATUS: OPTIONAL
*/
- void (*exch_mgr_reset)(struct fc_lport *,
- u32 s_id, u32 d_id);
+ void (*exch_mgr_reset)(struct fc_lport *, u32 s_id, u32 d_id);
/*
* Flush the rport work queue. Generally used before shutdown.
@@ -498,8 +570,8 @@ struct libfc_function_template {
*
* STATUS: OPTIONAL
*/
- void (*lport_recv)(struct fc_lport *lp, struct fc_seq *sp,
- struct fc_frame *fp);
+ void (*lport_recv)(struct fc_lport *, struct fc_seq *,
+ struct fc_frame *);
/*
* Reset the local port.
@@ -565,31 +637,31 @@ struct libfc_function_template {
*
* 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));
+ 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 durring link down and reset
*
* STATUS: OPTIONAL
*/
- void (*fcp_cleanup)(struct fc_lport *lp);
+ void (*fcp_cleanup)(struct fc_lport *);
/*
* Abort all I/O on a local port
*
* STATUS: OPTIONAL
*/
- void (*fcp_abort_io)(struct fc_lport *lp);
+ void (*fcp_abort_io)(struct fc_lport *);
/*
* Receive a request for the discovery layer.
*
* STATUS: OPTIONAL
*/
- void (*disc_recv_req)(struct fc_seq *,
- struct fc_frame *, struct fc_lport *);
+ void (*disc_recv_req)(struct fc_seq *, struct fc_frame *,
+ struct fc_lport *);
/*
* Start discovery for a local port.
@@ -618,133 +690,224 @@ struct libfc_function_template {
void (*disc_stop_final) (struct fc_lport *);
};
-/* information used by the discovery layer */
+/**
+ * struct fc_disc - Discovery context
+ * @retry_count: Number of retries
+ * @pending: 1 if discovery is pending, 0 if not
+ * @requesting: 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
+ * @lport: The local port that discovery is for
+ * @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;
+ 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;
+ struct fc_lport *lport;
+ 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);
-
- 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 - Local port
+ * @host: The SCSI host associated with a local port
+ * @ema_list: Exchange manager anchor list
+ * @dns_rdata: The directory 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
+ * @dev_stats: FCoE device stats (TODO: libfc should not be
+ * FCoE aware)
+ * @retry_count: Number of retries in the current state
+ * @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
+ * @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: Handle for list of local ports
+ * @retry_work: Handle to local port for delayed retry context
+ */
struct fc_lport {
- struct list_head list;
-
/* Associations */
- struct Scsi_Host *host;
- struct list_head ema_list;
- struct list_head vports; /* child vports if N_Port */
- struct fc_vport *vport; /* parent vport if VN_Port */
- struct fc_rport_priv *dns_rp;
- struct fc_rport_priv *ptp_rp;
- void *scsi_priv;
- struct fc_disc disc;
+ struct Scsi_Host *host;
+ struct list_head ema_list;
+ struct fc_rport_priv *dns_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 fcoe_dev_stats *dev_stats;
-
- u64 wwpn;
- u64 wwnn;
- u8 retry_count;
+ 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;
+ u8 retry_count;
+
+ /* Fabric information */
+ 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; /* 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 does_npiv:1; /* supports multiple vports */
- u32 npiv_enabled:1; /* switch/fabric allows NPIV */
- 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;
+ 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 mfs;
+ u8 max_retry_count;
+ u8 max_rport_retry_count;
+ u16 link_speed;
+ u16 link_supported_speeds;
+ u16 lro_xid;
+ unsigned int lso_max;
+ struct fc_ns_fts fcts;
/* Miscellaneous */
- struct delayed_work retry_work;
+ struct mutex lp_mutex;
+ struct list_head list;
+ struct delayed_work retry_work;
};
/*
* FC_LPORT HELPER FUNCTIONS
*****************************/
-static inline int fc_lport_test_ready(struct fc_lport *lp)
+
+/**
+ * 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 lp->state == LPORT_ST_READY;
+ return lport->state == LPORT_ST_READY;
}
-static inline void fc_set_wwnn(struct fc_lport *lp, u64 wwnn)
+/**
+ * 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)
{
- lp->wwnn = wwnn;
+ lport->wwnn = wwnn;
}
-static inline void fc_set_wwpn(struct fc_lport *lp, u64 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)
{
- lp->wwpn = wwnn;
+ lport->wwpn = wwnn;
}
-static inline void fc_lport_state_enter(struct fc_lport *lp,
+/**
+ * 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 != lp->state)
- lp->retry_count = 0;
- lp->state = state;
+ if (state != lport->state)
+ lport->retry_count = 0;
+ lport->state = state;
}
-static inline int fc_lport_init_stats(struct fc_lport *lp)
+/**
+ * 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)
{
- /* allocate per cpu stats block */
- lp->dev_stats = alloc_percpu(struct fcoe_dev_stats);
- if (!lp->dev_stats)
+ lport->dev_stats = alloc_percpu(struct fcoe_dev_stats);
+ if (!lport->dev_stats)
return -ENOMEM;
return 0;
}
-static inline void fc_lport_free_stats(struct fc_lport *lp)
+/**
+ * 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(lp->dev_stats);
+ free_percpu(lport->dev_stats);
}
-static inline struct fcoe_dev_stats *fc_lport_get_stats(struct fc_lport *lp)
+/**
+ * fc_lport_get_stats() - Get a local port's statistics
+ * @lport: The local port whose statistics are to be retreived
+ */
+static inline struct fcoe_dev_stats *fc_lport_get_stats(struct fc_lport *lport)
{
- return per_cpu_ptr(lp->dev_stats, smp_processor_id());
+ return per_cpu_ptr(lport->dev_stats, smp_processor_id());
}
-static inline void *lport_priv(const struct fc_lport *lp)
+/**
+ * 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 *)(lp + 1);
+ return (void *)(lport + 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
+ * 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
*/
@@ -765,156 +928,73 @@ libfc_host_alloc(struct scsi_host_template *sht, int priv_size)
}
/*
- * LOCAL PORT LAYER
+ * FC_FCP HELPER FUNCTIONS
*****************************/
-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);
+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;
+}
/*
- * The link is up for the given local port.
- */
+ * 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 *);
-
-/*
- * Link is down for the given local port.
- */
void __fc_linkdown(struct fc_lport *);
void fc_linkdown(struct fc_lport *);
-
-/*
- * Configure the local port.
- */
+void fc_vport_setlink(struct fc_lport *);
+void fc_vports_linkchange(struct fc_lport *);
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);
-
-/*
- * Allocate a new lport struct for an NPIV VN_Port
- */
-struct fc_lport *libfc_vport_create(struct fc_vport *vport, int privsize);
-
-/*
- * Find an NPIV VN_Port by port ID
- */
-struct fc_lport *fc_vport_id_lookup(struct fc_lport *n_port, u32 port_id);
-
-/*
- * NPIV VN_Port link state management
- */
-void fc_vport_setlink(struct fc_lport *vn_port);
-void fc_vports_linkchange(struct fc_lport *n_port);
-
-/*
- * Issue fc pass-thru request via bsg interface
- */
-int fc_lport_bsg_request(struct fc_bsg_job *job);
-
+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 *);
/*
* REMOTE PORT LAYER
*****************************/
-int fc_rport_init(struct fc_lport *lp);
-void fc_rport_terminate_io(struct fc_rport *rp);
+int fc_rport_init(struct fc_lport *);
+void fc_rport_terminate_io(struct fc_rport *);
/*
* DISCOVERY LAYER
*****************************/
-int fc_disc_init(struct fc_lport *lp);
-
+int fc_disc_init(struct fc_lport *);
/*
- * SCSI LAYER
+ * FCP LAYER
*****************************/
-/*
- * Initialize the SCSI block of libfc
- */
int fc_fcp_init(struct fc_lport *);
+void fc_fcp_destroy(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,
+ * SCSI INTERACTION LAYER
+ *****************************/
+int fc_queuecommand(struct scsi_cmnd *,
void (*done)(struct scsi_cmnd *));
-
-/*
- * 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, int reason);
-
-/*
- * 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 *);
+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
*****************************/
-/*
- * Initializes ELS/CT interface
- */
-int fc_elsct_init(struct fc_lport *lp);
-struct fc_seq *fc_elsct_send(struct fc_lport *lport,
- u32 did,
- struct fc_frame *fp,
+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 *fp,
+ struct fc_frame *,
void *arg),
void *arg, u32 timer_msec);
void fc_lport_flogi_resp(struct fc_seq *, struct fc_frame *, void *);
@@ -924,90 +1004,26 @@ void fc_lport_logo_resp(struct fc_seq *, struct fc_frame *, void *);
/*
* EXCHANGE MANAGER LAYER
*****************************/
-/*
- * Initializes Exchange Manager related
- * function pointers in struct libfc_function_template.
- */
-int fc_exch_init(struct fc_lport *lp);
-
-/*
- * Adds Exchange Manager (EM) mp to lport.
- *
- * Adds specified mp to lport using struct fc_exch_mgr_anchor,
- * the struct fc_exch_mgr_anchor allows same EM sharing by
- * more than one lport with their specified match function,
- * the match function is used in allocating exchange from
- * added mp.
- */
-struct fc_exch_mgr_anchor *fc_exch_mgr_add(struct fc_lport *lport,
- struct fc_exch_mgr *mp,
+int fc_exch_init(struct fc_lport *);
+struct fc_exch_mgr_anchor *fc_exch_mgr_add(struct fc_lport *,
+ struct fc_exch_mgr *,
bool (*match)(struct fc_frame *));
-
-/*
- * Deletes Exchange Manager (EM) from lport by removing
- * its anchor ema from lport.
- *
- * If removed anchor ema was the last user of its associated EM
- * then also destroys associated EM.
- */
-void fc_exch_mgr_del(struct fc_exch_mgr_anchor *ema);
-
-/*
- * Clone an exchange manager list, getting reference holds for each EM.
- * This is for use with NPIV and sharing the X_ID space between VN_Ports.
- */
+void fc_exch_mgr_del(struct fc_exch_mgr_anchor *);
int fc_exch_mgr_list_clone(struct fc_lport *src, struct fc_lport *dst);
-
-/*
- * 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.
- *
- * Specified match function is used in allocating exchanges
- * from newly allocated EM.
- */
-struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *lp,
- enum fc_class class,
- u16 min_xid,
- u16 max_xid,
+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 *));
-
-/*
- * Free all exchange managers of a lport.
- */
-void fc_exch_mgr_free(struct fc_lport *lport);
-
-/*
- * Receive a frame on specified local port and exchange manager.
- */
-void fc_exch_recv(struct fc_lport *lp, struct fc_frame *fp);
-
-/*
- * Reset all EMs of a lport, releasing its all sequences and
- * exchanges. If sid is non-zero, then reset only exchanges
- * we sourced from that FID. If did is non-zero, reset only
- * exchanges destined to that FID.
- */
+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 *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);
+void fc_get_host_speed(struct Scsi_Host *);
+void fc_get_host_port_type(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_ */