diff options
Diffstat (limited to 'drivers/scsi/libfc/fc_exch.c')
| -rw-r--r-- | drivers/scsi/libfc/fc_exch.c | 932 |
1 files changed, 597 insertions, 335 deletions
diff --git a/drivers/scsi/libfc/fc_exch.c b/drivers/scsi/libfc/fc_exch.c index c1c15748220c..19d711cb938c 100644 --- a/drivers/scsi/libfc/fc_exch.c +++ b/drivers/scsi/libfc/fc_exch.c @@ -32,10 +32,13 @@ #include <scsi/libfc.h> #include <scsi/fc_encode.h> +#include "fc_libfc.h" + u16 fc_cpu_mask; /* cpu mask for possible cpus */ EXPORT_SYMBOL(fc_cpu_mask); static u16 fc_cpu_order; /* 2's power to represent total possible cpus */ -static struct kmem_cache *fc_em_cachep; /* cache for exchanges */ +static struct kmem_cache *fc_em_cachep; /* cache for exchanges */ +struct workqueue_struct *fc_exch_workqueue; /* * Structure and function definitions for managing Fibre Channel Exchanges @@ -50,35 +53,46 @@ static struct kmem_cache *fc_em_cachep; /* cache for exchanges */ * fc_seq holds the state for an individual sequence. */ -/* - * Per cpu exchange pool +/** + * struct fc_exch_pool - Per cpu exchange pool + * @next_index: Next possible free exchange index + * @total_exches: Total allocated exchanges + * @lock: Exch pool lock + * @ex_list: List of exchanges * * This structure manages per cpu exchanges in array of exchange pointers. * This array is allocated followed by struct fc_exch_pool memory for * assigned range of exchanges to per cpu pool. */ struct fc_exch_pool { - u16 next_index; /* next possible free exchange index */ - u16 total_exches; /* total allocated exchanges */ - spinlock_t lock; /* exch pool lock */ - struct list_head ex_list; /* allocated exchanges list */ + u16 next_index; + u16 total_exches; + spinlock_t lock; + struct list_head ex_list; }; -/* - * Exchange manager. +/** + * struct fc_exch_mgr - The Exchange Manager (EM). + * @class: Default class for new sequences + * @kref: Reference counter + * @min_xid: Minimum exchange ID + * @max_xid: Maximum exchange ID + * @ep_pool: Reserved exchange pointers + * @pool_max_index: Max exch array index in exch pool + * @pool: Per cpu exch pool + * @stats: Statistics structure * * This structure is the center for creating exchanges and sequences. * It manages the allocation of exchange IDs. */ struct fc_exch_mgr { - enum fc_class class; /* default class for sequences */ - struct kref kref; /* exchange mgr reference count */ - u16 min_xid; /* min exchange ID */ - u16 max_xid; /* max exchange ID */ - struct list_head ex_list; /* allocated exchanges list */ - mempool_t *ep_pool; /* reserve ep's */ - u16 pool_max_index; /* max exch array index in exch pool */ - struct fc_exch_pool *pool; /* per cpu exch pool */ + enum fc_class class; + struct kref kref; + u16 min_xid; + u16 max_xid; + mempool_t *ep_pool; + u16 pool_max_index; + struct fc_exch_pool *pool; /* * currently exchange mgr stats are updated but not used. @@ -96,6 +110,18 @@ struct fc_exch_mgr { }; #define fc_seq_exch(sp) container_of(sp, struct fc_exch, seq) +/** + * struct fc_exch_mgr_anchor - primary structure for list of EMs + * @ema_list: Exchange Manager Anchor list + * @mp: Exchange Manager associated with this anchor + * @match: Routine to determine if this anchor's EM should be used + * + * When walking the list of anchors the match routine will be called + * for each anchor to determine if that EM should be used. The last + * anchor in the list will always match to handle any exchanges not + * handled by other EMs. The non-default EMs would be added to the + * anchor list by HW that provides FCoE offloads. + */ struct fc_exch_mgr_anchor { struct list_head ema_list; struct fc_exch_mgr *mp; @@ -108,7 +134,6 @@ static void fc_seq_ls_rjt(struct fc_seq *, enum fc_els_rjt_reason, enum fc_els_rjt_explan); static void fc_exch_els_rec(struct fc_seq *, struct fc_frame *); static void fc_exch_els_rrq(struct fc_seq *, struct fc_frame *); -static struct fc_seq *fc_seq_start_next_locked(struct fc_seq *sp); /* * Internal implementation notes. @@ -196,6 +221,15 @@ static char *fc_exch_rctl_names[] = FC_RCTL_NAMES_INIT; #define FC_TABLE_SIZE(x) (sizeof(x) / sizeof(x[0])) +/** + * fc_exch_name_lookup() - Lookup name by opcode + * @op: Opcode to be looked up + * @table: Opcode/name table + * @max_index: Index not to be exceeded + * + * This routine is used to determine a human-readable string identifying + * a R_CTL opcode. + */ static inline const char *fc_exch_name_lookup(unsigned int op, char **table, unsigned int max_index) { @@ -208,25 +242,34 @@ static inline const char *fc_exch_name_lookup(unsigned int op, char **table, return name; } +/** + * fc_exch_rctl_name() - Wrapper routine for fc_exch_name_lookup() + * @op: The opcode to be looked up + */ static const char *fc_exch_rctl_name(unsigned int op) { return fc_exch_name_lookup(op, fc_exch_rctl_names, FC_TABLE_SIZE(fc_exch_rctl_names)); } -/* - * Hold an exchange - keep it from being freed. +/** + * fc_exch_hold() - Increment an exchange's reference count + * @ep: Echange to be held */ -static void fc_exch_hold(struct fc_exch *ep) +static inline void fc_exch_hold(struct fc_exch *ep) { atomic_inc(&ep->ex_refcnt); } -/* - * setup fc hdr by initializing few more FC header fields and sof/eof. - * Initialized fields by this func: - * - fh_ox_id, fh_rx_id, fh_seq_id, fh_seq_cnt - * - sof and eof +/** + * fc_exch_setup_hdr() - Initialize a FC header by initializing some fields + * and determine SOF and EOF. + * @ep: The exchange to that will use the header + * @fp: The frame whose header is to be modified + * @f_ctl: F_CTL bits that will be used for the frame header + * + * The fields initialized by this routine are: fh_ox_id, fh_rx_id, + * fh_seq_id, fh_seq_cnt and the SOF and EOF. */ static void fc_exch_setup_hdr(struct fc_exch *ep, struct fc_frame *fp, u32 f_ctl) @@ -243,7 +286,7 @@ static void fc_exch_setup_hdr(struct fc_exch *ep, struct fc_frame *fp, if (fc_sof_needs_ack(ep->class)) fr_eof(fp) = FC_EOF_N; /* - * Form f_ctl. + * From F_CTL. * The number of fill bytes to make the length a 4-byte * multiple is the low order 2-bits of the f_ctl. * The fill itself will have been cleared by the frame @@ -273,10 +316,12 @@ static void fc_exch_setup_hdr(struct fc_exch *ep, struct fc_frame *fp, fh->fh_seq_cnt = htons(ep->seq.cnt); } - -/* - * Release a reference to an exchange. - * If the refcnt goes to zero and the exchange is complete, it is freed. +/** + * fc_exch_release() - Decrement an exchange's reference count + * @ep: Exchange to be released + * + * If the reference count reaches zero and the exchange is complete, + * it is freed. */ static void fc_exch_release(struct fc_exch *ep) { @@ -291,6 +336,10 @@ static void fc_exch_release(struct fc_exch *ep) } } +/** + * fc_exch_done_locked() - Complete an exchange with the exchange lock held + * @ep: The exchange that is complete + */ static int fc_exch_done_locked(struct fc_exch *ep) { int rc = 1; @@ -315,6 +364,15 @@ static int fc_exch_done_locked(struct fc_exch *ep) return rc; } +/** + * fc_exch_ptr_get() - Return an exchange from an exchange pool + * @pool: Exchange Pool to get an exchange from + * @index: Index of the exchange within the pool + * + * Use the index to get an exchange from within an exchange pool. exches + * will point to an array of exchange pointers. The index will select + * the exchange within the array. + */ static inline struct fc_exch *fc_exch_ptr_get(struct fc_exch_pool *pool, u16 index) { @@ -322,12 +380,22 @@ static inline struct fc_exch *fc_exch_ptr_get(struct fc_exch_pool *pool, return exches[index]; } +/** + * fc_exch_ptr_set() - Assign an exchange to a slot in an exchange pool + * @pool: The pool to assign the exchange to + * @index: The index in the pool where the exchange will be assigned + * @ep: The exchange to assign to the pool + */ static inline void fc_exch_ptr_set(struct fc_exch_pool *pool, u16 index, struct fc_exch *ep) { ((struct fc_exch **)(pool + 1))[index] = ep; } +/** + * fc_exch_delete() - Delete an exchange + * @ep: The exchange to be deleted + */ static void fc_exch_delete(struct fc_exch *ep) { struct fc_exch_pool *pool; @@ -343,8 +411,14 @@ static void fc_exch_delete(struct fc_exch *ep) fc_exch_release(ep); /* drop hold for exch in mp */ } -/* - * Internal version of fc_exch_timer_set - used with lock held. +/** + * fc_exch_timer_set_locked() - Start a timer for an exchange w/ the + * the exchange lock held + * @ep: The exchange whose timer will start + * @timer_msec: The timeout period + * + * Used for upper level protocols to time out the exchange. + * The timer is cancelled when it fires or when the exchange completes. */ static inline void fc_exch_timer_set_locked(struct fc_exch *ep, unsigned int timer_msec) @@ -354,17 +428,15 @@ static inline void fc_exch_timer_set_locked(struct fc_exch *ep, FC_EXCH_DBG(ep, "Exchange timer armed\n"); - if (schedule_delayed_work(&ep->timeout_work, - msecs_to_jiffies(timer_msec))) + if (queue_delayed_work(fc_exch_workqueue, &ep->timeout_work, + msecs_to_jiffies(timer_msec))) fc_exch_hold(ep); /* hold for timer */ } -/* - * Set timer for an exchange. - * The time is a minimum delay in milliseconds until the timer fires. - * Used for upper level protocols to time out the exchange. - * The timer is cancelled when it fires or when the exchange completes. - * Returns non-zero if a timer couldn't be allocated. +/** + * fc_exch_timer_set() - Lock the exchange and set the timer + * @ep: The exchange whose timer will start + * @timer_msec: The timeout period */ static void fc_exch_timer_set(struct fc_exch *ep, unsigned int timer_msec) { @@ -373,7 +445,115 @@ static void fc_exch_timer_set(struct fc_exch *ep, unsigned int timer_msec) spin_unlock_bh(&ep->ex_lock); } -int fc_seq_exch_abort(const struct fc_seq *req_sp, unsigned int timer_msec) +/** + * fc_seq_send() - Send a frame using existing sequence/exchange pair + * @lport: The local port that the exchange will be sent on + * @sp: The sequence to be sent + * @fp: The frame to be sent on the exchange + */ +static int fc_seq_send(struct fc_lport *lport, struct fc_seq *sp, + struct fc_frame *fp) +{ + struct fc_exch *ep; + struct fc_frame_header *fh = fc_frame_header_get(fp); + int error; + u32 f_ctl; + + ep = fc_seq_exch(sp); + WARN_ON((ep->esb_stat & ESB_ST_SEQ_INIT) != ESB_ST_SEQ_INIT); + + f_ctl = ntoh24(fh->fh_f_ctl); + fc_exch_setup_hdr(ep, fp, f_ctl); + + /* + * update sequence count if this frame is carrying + * multiple FC frames when sequence offload is enabled + * by LLD. + */ + if (fr_max_payload(fp)) + sp->cnt += DIV_ROUND_UP((fr_len(fp) - sizeof(*fh)), + fr_max_payload(fp)); + else + sp->cnt++; + + /* + * Send the frame. + */ + error = lport->tt.frame_send(lport, fp); + + /* + * Update the exchange and sequence flags, + * assuming all frames for the sequence have been sent. + * We can only be called to send once for each sequence. + */ + spin_lock_bh(&ep->ex_lock); + ep->f_ctl = f_ctl & ~FC_FC_FIRST_SEQ; /* not first seq */ + if (f_ctl & (FC_FC_END_SEQ | FC_FC_SEQ_INIT)) + ep->esb_stat &= ~ESB_ST_SEQ_INIT; + spin_unlock_bh(&ep->ex_lock); + return error; +} + +/** + * fc_seq_alloc() - Allocate a sequence for a given exchange + * @ep: The exchange to allocate a new sequence for + * @seq_id: The sequence ID to be used + * + * We don't support multiple originated sequences on the same exchange. + * By implication, any previously originated sequence on this exchange + * is complete, and we reallocate the same sequence. + */ +static struct fc_seq *fc_seq_alloc(struct fc_exch *ep, u8 seq_id) +{ + struct fc_seq *sp; + + sp = &ep->seq; + sp->ssb_stat = 0; + sp->cnt = 0; + sp->id = seq_id; + return sp; +} + +/** + * fc_seq_start_next_locked() - Allocate a new sequence on the same + * exchange as the supplied sequence + * @sp: The sequence/exchange to get a new sequence for + */ +static struct fc_seq *fc_seq_start_next_locked(struct fc_seq *sp) +{ + struct fc_exch *ep = fc_seq_exch(sp); + + sp = fc_seq_alloc(ep, ep->seq_id++); + FC_EXCH_DBG(ep, "f_ctl %6x seq %2x\n", + ep->f_ctl, sp->id); + return sp; +} + +/** + * fc_seq_start_next() - Lock the exchange and get a new sequence + * for a given sequence/exchange pair + * @sp: The sequence/exchange to get a new exchange for + */ +static struct fc_seq *fc_seq_start_next(struct fc_seq *sp) +{ + struct fc_exch *ep = fc_seq_exch(sp); + + spin_lock_bh(&ep->ex_lock); + sp = fc_seq_start_next_locked(sp); + spin_unlock_bh(&ep->ex_lock); + + return sp; +} + +/** + * fc_seq_exch_abort() - Abort an exchange and sequence + * @req_sp: The sequence to be aborted + * @timer_msec: The period of time to wait before aborting + * + * Generally called because of a timeout or an abort from the upper layer. + */ +static int fc_seq_exch_abort(const struct fc_seq *req_sp, + unsigned int timer_msec) { struct fc_seq *sp; struct fc_exch *ep; @@ -422,11 +602,10 @@ int fc_seq_exch_abort(const struct fc_seq *req_sp, unsigned int timer_msec) error = -ENOBUFS; return error; } -EXPORT_SYMBOL(fc_seq_exch_abort); -/* - * Exchange timeout - handle exchange timer expiration. - * The timer will have been cancelled before this is called. +/** + * fc_exch_timeout() - Handle exchange timer expiration + * @work: The work_struct identifying the exchange that timed out */ static void fc_exch_timeout(struct work_struct *work) { @@ -474,28 +653,10 @@ done: fc_exch_release(ep); } -/* - * Allocate a sequence. - * - * We don't support multiple originated sequences on the same exchange. - * By implication, any previously originated sequence on this exchange - * is complete, and we reallocate the same sequence. - */ -static struct fc_seq *fc_seq_alloc(struct fc_exch *ep, u8 seq_id) -{ - struct fc_seq *sp; - - sp = &ep->seq; - sp->ssb_stat = 0; - sp->cnt = 0; - sp->id = seq_id; - return sp; -} - /** - * fc_exch_em_alloc() - allocate an exchange from a specified EM. - * @lport: ptr to the local port - * @mp: ptr to the exchange manager + * fc_exch_em_alloc() - Allocate an exchange from a specified EM. + * @lport: The local port that the exchange is for + * @mp: The exchange manager that will allocate the exchange * * Returns pointer to allocated fc_exch with exch lock held. */ @@ -563,16 +724,18 @@ err: } /** - * fc_exch_alloc() - allocate an exchange. - * @lport: ptr to the local port - * @fp: ptr to the FC frame + * fc_exch_alloc() - Allocate an exchange from an EM on a + * local port's list of EMs. + * @lport: The local port that will own the exchange + * @fp: The FC frame that the exchange will be for * - * This function walks the list of the exchange manager(EM) - * anchors to select a EM for new exchange allocation. The - * EM is selected having either a NULL match function pointer - * or call to match function returning true. + * This function walks the list of exchange manager(EM) + * anchors to select an EM for a new exchange allocation. The + * EM is selected when a NULL match function pointer is encountered + * or when a call to a match function returns true. */ -struct fc_exch *fc_exch_alloc(struct fc_lport *lport, struct fc_frame *fp) +static struct fc_exch *fc_exch_alloc(struct fc_lport *lport, + struct fc_frame *fp) { struct fc_exch_mgr_anchor *ema; struct fc_exch *ep; @@ -586,10 +749,11 @@ struct fc_exch *fc_exch_alloc(struct fc_lport *lport, struct fc_frame *fp) } return NULL; } -EXPORT_SYMBOL(fc_exch_alloc); -/* - * Lookup and hold an exchange. +/** + * fc_exch_find() - Lookup and hold an exchange + * @mp: The exchange manager to lookup the exchange from + * @xid: The XID of the exchange to look up */ static struct fc_exch *fc_exch_find(struct fc_exch_mgr *mp, u16 xid) { @@ -609,7 +773,13 @@ static struct fc_exch *fc_exch_find(struct fc_exch_mgr *mp, u16 xid) return ep; } -void fc_exch_done(struct fc_seq *sp) + +/** + * fc_exch_done() - Indicate that an exchange/sequence tuple is complete and + * the memory allocated for the related objects may be freed. + * @sp: The sequence that has completed + */ +static void fc_exch_done(struct fc_seq *sp) { struct fc_exch *ep = fc_seq_exch(sp); int rc; @@ -620,10 +790,13 @@ void fc_exch_done(struct fc_seq *sp) if (!rc) fc_exch_delete(ep); } -EXPORT_SYMBOL(fc_exch_done); -/* - * Allocate a new exchange as responder. +/** + * fc_exch_resp() - Allocate a new exchange for a response frame + * @lport: The local port that the exchange was for + * @mp: The exchange manager to allocate the exchange from + * @fp: The response frame + * * Sets the responder ID in the frame header. */ static struct fc_exch *fc_exch_resp(struct fc_lport *lport, @@ -664,8 +837,13 @@ static struct fc_exch *fc_exch_resp(struct fc_lport *lport, return ep; } -/* - * Find a sequence for receive where the other end is originating the sequence. +/** + * fc_seq_lookup_recip() - Find a sequence where the other end + * originated the sequence + * @lport: The local port that the frame was sent to + * @mp: The Exchange Manager to lookup the exchange from + * @fp: The frame associated with the sequence we're looking for + * * If fc_pf_rjt_reason is FC_RJT_NONE then this function will have a hold * on the ep that should be released by the caller. */ @@ -771,10 +949,12 @@ rel: return reject; } -/* - * Find the sequence for a frame being received. - * We originated the sequence, so it should be found. - * We may or may not have originated the exchange. +/** + * fc_seq_lookup_orig() - Find a sequence where this end + * originated the sequence + * @mp: The Exchange Manager to lookup the exchange from + * @fp: The frame associated with the sequence we're looking for + * * Does not hold the sequence for the caller. */ static struct fc_seq *fc_seq_lookup_orig(struct fc_exch_mgr *mp, @@ -806,8 +986,12 @@ static struct fc_seq *fc_seq_lookup_orig(struct fc_exch_mgr *mp, return sp; } -/* - * Set addresses for an exchange. +/** + * fc_exch_set_addr() - Set the source and destination IDs for an exchange + * @ep: The exchange to set the addresses for + * @orig_id: The originator's ID + * @resp_id: The responder's ID + * * Note this must be done before the first sequence of the exchange is sent. */ static void fc_exch_set_addr(struct fc_exch *ep, @@ -823,76 +1007,15 @@ static void fc_exch_set_addr(struct fc_exch *ep, } } -static struct fc_seq *fc_seq_start_next_locked(struct fc_seq *sp) -{ - struct fc_exch *ep = fc_seq_exch(sp); - - sp = fc_seq_alloc(ep, ep->seq_id++); - FC_EXCH_DBG(ep, "f_ctl %6x seq %2x\n", - ep->f_ctl, sp->id); - return sp; -} -/* - * Allocate a new sequence on the same exchange as the supplied sequence. - * This will never return NULL. +/** + * fc_seq_els_rsp_send() - Send an ELS response using infomation from + * the existing sequence/exchange. + * @sp: The sequence/exchange to get information from + * @els_cmd: The ELS command to be sent + * @els_data: The ELS data to be sent */ -struct fc_seq *fc_seq_start_next(struct fc_seq *sp) -{ - struct fc_exch *ep = fc_seq_exch(sp); - - spin_lock_bh(&ep->ex_lock); - sp = fc_seq_start_next_locked(sp); - spin_unlock_bh(&ep->ex_lock); - - return sp; -} -EXPORT_SYMBOL(fc_seq_start_next); - -int fc_seq_send(struct fc_lport *lp, struct fc_seq *sp, struct fc_frame *fp) -{ - struct fc_exch *ep; - struct fc_frame_header *fh = fc_frame_header_get(fp); - int error; - u32 f_ctl; - - ep = fc_seq_exch(sp); - WARN_ON((ep->esb_stat & ESB_ST_SEQ_INIT) != ESB_ST_SEQ_INIT); - - f_ctl = ntoh24(fh->fh_f_ctl); - fc_exch_setup_hdr(ep, fp, f_ctl); - - /* - * update sequence count if this frame is carrying - * multiple FC frames when sequence offload is enabled - * by LLD. - */ - if (fr_max_payload(fp)) - sp->cnt += DIV_ROUND_UP((fr_len(fp) - sizeof(*fh)), - fr_max_payload(fp)); - else - sp->cnt++; - - /* - * Send the frame. - */ - error = lp->tt.frame_send(lp, fp); - - /* - * Update the exchange and sequence flags, - * assuming all frames for the sequence have been sent. - * We can only be called to send once for each sequence. - */ - spin_lock_bh(&ep->ex_lock); - ep->f_ctl = f_ctl & ~FC_FC_FIRST_SEQ; /* not first seq */ - if (f_ctl & (FC_FC_END_SEQ | FC_FC_SEQ_INIT)) - ep->esb_stat &= ~ESB_ST_SEQ_INIT; - spin_unlock_bh(&ep->ex_lock); - return error; -} -EXPORT_SYMBOL(fc_seq_send); - -void fc_seq_els_rsp_send(struct fc_seq *sp, enum fc_els_cmd els_cmd, - struct fc_seq_els_data *els_data) +static void fc_seq_els_rsp_send(struct fc_seq *sp, enum fc_els_cmd els_cmd, + struct fc_seq_els_data *els_data) { switch (els_cmd) { case ELS_LS_RJT: @@ -911,10 +1034,13 @@ void fc_seq_els_rsp_send(struct fc_seq *sp, enum fc_els_cmd els_cmd, FC_EXCH_DBG(fc_seq_exch(sp), "Invalid ELS CMD:%x\n", els_cmd); } } -EXPORT_SYMBOL(fc_seq_els_rsp_send); -/* - * Send a sequence, which is also the last sequence in the exchange. +/** + * fc_seq_send_last() - Send a sequence that is the last in the exchange + * @sp: The sequence that is to be sent + * @fp: The frame that will be sent on the sequence + * @rctl: The R_CTL information to be sent + * @fh_type: The frame header type */ static void fc_seq_send_last(struct fc_seq *sp, struct fc_frame *fp, enum fc_rctl rctl, enum fc_fh_type fh_type) @@ -928,9 +1054,12 @@ static void fc_seq_send_last(struct fc_seq *sp, struct fc_frame *fp, fc_seq_send(ep->lp, sp, fp); } -/* +/** + * fc_seq_send_ack() - Send an acknowledgement that we've received a frame + * @sp: The sequence to send the ACK on + * @rx_fp: The received frame that is being acknoledged + * * Send ACK_1 (or equiv.) indicating we received something. - * The frame we're acking is supplied. */ static void fc_seq_send_ack(struct fc_seq *sp, const struct fc_frame *rx_fp) { @@ -938,14 +1067,14 @@ static void fc_seq_send_ack(struct fc_seq *sp, const struct fc_frame *rx_fp) struct fc_frame_header *rx_fh; struct fc_frame_header *fh; struct fc_exch *ep = fc_seq_exch(sp); - struct fc_lport *lp = ep->lp; + struct fc_lport *lport = ep->lp; unsigned int f_ctl; /* * Don't send ACKs for class 3. */ if (fc_sof_needs_ack(fr_sof(rx_fp))) { - fp = fc_frame_alloc(lp, 0); + fp = fc_frame_alloc(lport, 0); if (!fp) return; @@ -980,12 +1109,16 @@ static void fc_seq_send_ack(struct fc_seq *sp, const struct fc_frame *rx_fp) else fr_eof(fp) = FC_EOF_N; - (void) lp->tt.frame_send(lp, fp); + lport->tt.frame_send(lport, fp); } } -/* - * Send BLS Reject. +/** + * fc_exch_send_ba_rjt() - Send BLS Reject + * @rx_fp: The frame being rejected + * @reason: The reason the frame is being rejected + * @explan: The explaination for the rejection + * * This is for rejecting BA_ABTS only. */ static void fc_exch_send_ba_rjt(struct fc_frame *rx_fp, @@ -996,11 +1129,11 @@ static void fc_exch_send_ba_rjt(struct fc_frame *rx_fp, struct fc_frame_header *rx_fh; struct fc_frame_header *fh; struct fc_ba_rjt *rp; - struct fc_lport *lp; + struct fc_lport *lport; unsigned int f_ctl; - lp = fr_dev(rx_fp); - fp = fc_frame_alloc(lp, sizeof(*rp)); + lport = fr_dev(rx_fp); + fp = fc_frame_alloc(lport, sizeof(*rp)); if (!fp) return; fh = fc_frame_header_get(fp); @@ -1045,13 +1178,17 @@ static void fc_exch_send_ba_rjt(struct fc_frame *rx_fp, if (fc_sof_needs_ack(fr_sof(fp))) fr_eof(fp) = FC_EOF_N; - (void) lp->tt.frame_send(lp, fp); + lport->tt.frame_send(lport, fp); } -/* - * Handle an incoming ABTS. This would be for target mode usually, - * but could be due to lost FCP transfer ready, confirm or RRQ. - * We always handle this as an exchange abort, ignoring the parameter. +/** + * fc_exch_recv_abts() - Handle an incoming ABTS + * @ep: The exchange the abort was on + * @rx_fp: The ABTS frame + * + * This would be for target mode usually, but could be due to lost + * FCP transfer ready, confirm or RRQ. We always handle this as an + * exchange abort, ignoring the parameter. */ static void fc_exch_recv_abts(struct fc_exch *ep, struct fc_frame *rx_fp) { @@ -1100,10 +1237,14 @@ free: fc_frame_free(rx_fp); } -/* - * Handle receive where the other end is originating the sequence. +/** + * fc_exch_recv_req() - Handler for an incoming request where is other + * end is originating the sequence + * @lport: The local port that received the request + * @mp: The EM that the exchange is on + * @fp: The request frame */ -static void fc_exch_recv_req(struct fc_lport *lp, struct fc_exch_mgr *mp, +static void fc_exch_recv_req(struct fc_lport *lport, struct fc_exch_mgr *mp, struct fc_frame *fp) { struct fc_frame_header *fh = fc_frame_header_get(fp); @@ -1114,8 +1255,17 @@ static void fc_exch_recv_req(struct fc_lport *lp, struct fc_exch_mgr *mp, u32 f_ctl; enum fc_pf_rjt_reason reject; + /* We can have the wrong fc_lport at this point with NPIV, which is a + * problem now that we know a new exchange needs to be allocated + */ + lport = fc_vport_id_lookup(lport, ntoh24(fh->fh_d_id)); + if (!lport) { + fc_frame_free(fp); + return; + } + fr_seq(fp) = NULL; - reject = fc_seq_lookup_recip(lp, mp, fp); + reject = fc_seq_lookup_recip(lport, mp, fp); if (reject == FC_RJT_NONE) { sp = fr_seq(fp); /* sequence will be held */ ep = fc_seq_exch(sp); @@ -1138,17 +1288,21 @@ static void fc_exch_recv_req(struct fc_lport *lp, struct fc_exch_mgr *mp, if (ep->resp) ep->resp(sp, fp, ep->arg); else - lp->tt.lport_recv(lp, sp, fp); + lport->tt.lport_recv(lport, sp, fp); fc_exch_release(ep); /* release from lookup */ } else { - FC_LPORT_DBG(lp, "exch/seq lookup failed: reject %x\n", reject); + FC_LPORT_DBG(lport, "exch/seq lookup failed: reject %x\n", + reject); fc_frame_free(fp); } } -/* - * Handle receive where the other end is originating the sequence in - * response to our exchange. +/** + * fc_exch_recv_seq_resp() - Handler for an incoming response where the other + * end is the originator of the sequence that is a + * response to our initial exchange + * @mp: The EM that the exchange is on + * @fp: The response frame */ static void fc_exch_recv_seq_resp(struct fc_exch_mgr *mp, struct fc_frame *fp) { @@ -1239,8 +1393,11 @@ out: fc_frame_free(fp); } -/* - * Handle receive for a sequence where other end is responding to our sequence. +/** + * fc_exch_recv_resp() - Handler for a sequence where other end is + * responding to our sequence + * @mp: The EM that the exchange is on + * @fp: The response frame */ static void fc_exch_recv_resp(struct fc_exch_mgr *mp, struct fc_frame *fp) { @@ -1256,9 +1413,13 @@ static void fc_exch_recv_resp(struct fc_exch_mgr *mp, struct fc_frame *fp) fc_frame_free(fp); } -/* - * Handle the response to an ABTS for exchange or sequence. - * This can be BA_ACC or BA_RJT. +/** + * fc_exch_abts_resp() - Handler for a response to an ABT + * @ep: The exchange that the frame is on + * @fp: The response frame + * + * This response would be to an ABTS cancelling an exchange or sequence. + * The response can be either BA_ACC or BA_RJT */ static void fc_exch_abts_resp(struct fc_exch *ep, struct fc_frame *fp) { @@ -1333,9 +1494,12 @@ static void fc_exch_abts_resp(struct fc_exch *ep, struct fc_frame *fp) } -/* - * Receive BLS sequence. - * This is always a sequence initiated by the remote side. +/** + * fc_exch_recv_bls() - Handler for a BLS sequence + * @mp: The EM that the exchange is on + * @fp: The request frame + * + * The BLS frame is always a sequence initiated by the remote side. * We may be either the originator or recipient of the exchange. */ static void fc_exch_recv_bls(struct fc_exch_mgr *mp, struct fc_frame *fp) @@ -1392,8 +1556,10 @@ static void fc_exch_recv_bls(struct fc_exch_mgr *mp, struct fc_frame *fp) fc_exch_release(ep); /* release hold taken by fc_exch_find */ } -/* - * Accept sequence with LS_ACC. +/** + * fc_seq_ls_acc() - Accept sequence with LS_ACC + * @req_sp: The request sequence + * * If this fails due to allocation or transmit congestion, assume the * originator will repeat the sequence. */ @@ -1413,8 +1579,12 @@ static void fc_seq_ls_acc(struct fc_seq *req_sp) } } -/* - * Reject sequence with ELS LS_RJT. +/** + * fc_seq_ls_rjt() - Reject a sequence with ELS LS_RJT + * @req_sp: The request sequence + * @reason: The reason the sequence is being rejected + * @explan: The explaination for the rejection + * * If this fails due to allocation or transmit congestion, assume the * originator will repeat the sequence. */ @@ -1437,6 +1607,10 @@ static void fc_seq_ls_rjt(struct fc_seq *req_sp, enum fc_els_rjt_reason reason, } } +/** + * fc_exch_reset() - Reset an exchange + * @ep: The exchange to be reset + */ static void fc_exch_reset(struct fc_exch *ep) { struct fc_seq *sp; @@ -1446,12 +1620,6 @@ static void fc_exch_reset(struct fc_exch *ep) spin_lock_bh(&ep->ex_lock); ep->state |= FC_EX_RST_CLEANUP; - /* - * we really want to call del_timer_sync, but cannot due - * to the lport calling with the lport lock held (some resp - * functions can also grab the lport lock which could cause - * a deadlock). - */ if (cancel_delayed_work(&ep->timeout_work)) atomic_dec(&ep->ex_refcnt); /* drop hold for timer */ resp = ep->resp; @@ -1471,16 +1639,16 @@ static void fc_exch_reset(struct fc_exch *ep) } /** - * fc_exch_pool_reset() - Resets an per cpu exches pool. - * @lport: ptr to the local port - * @pool: ptr to the per cpu exches pool - * @sid: source FC ID - * @did: destination FC ID + * fc_exch_pool_reset() - Reset a per cpu exchange pool + * @lport: The local port that the exchange pool is on + * @pool: The exchange pool to be reset + * @sid: The source ID + * @did: The destination ID * - * Resets an per cpu exches pool, 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. + * Resets a per cpu exches pool, releasing all of its sequences + * and exchanges. If sid is non-zero then reset only exchanges + * we sourced from the local port's FID. If did is non-zero then + * only reset exchanges destined for the local port's FID. */ static void fc_exch_pool_reset(struct fc_lport *lport, struct fc_exch_pool *pool, @@ -1514,15 +1682,15 @@ restart: } /** - * fc_exch_mgr_reset() - Resets all EMs of a lport - * @lport: ptr to the local port - * @sid: source FC ID - * @did: destination FC ID + * fc_exch_mgr_reset() - Reset all EMs of a local port + * @lport: The local port whose EMs are to be reset + * @sid: The source ID + * @did: The destination ID * - * 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. + * Reset all EMs associated with a given local port. Release all + * sequences and exchanges. If sid is non-zero then reset only the + * exchanges sent from the local port's FID. If did is non-zero then + * reset only exchanges destined for the local port's FID. */ void fc_exch_mgr_reset(struct fc_lport *lport, u32 sid, u32 did) { @@ -1538,8 +1706,11 @@ void fc_exch_mgr_reset(struct fc_lport *lport, u32 sid, u32 did) } EXPORT_SYMBOL(fc_exch_mgr_reset); -/* - * Handle incoming ELS REC - Read Exchange Concise. +/** + * fc_exch_els_rec() - Handler for ELS REC (Read Exchange Concise) requests + * @sp: The sequence the REC is on + * @rfp: The REC frame + * * Note that the requesting port may be different than the S_ID in the request. */ static void fc_exch_els_rec(struct fc_seq *sp, struct fc_frame *rfp) @@ -1621,10 +1792,11 @@ reject: fc_frame_free(rfp); } -/* - * Handle response from RRQ. - * Not much to do here, really. - * Should report errors. +/** + * fc_exch_rrq_resp() - Handler for RRQ responses + * @sp: The sequence that the RRQ is on + * @fp: The RRQ frame + * @arg: The exchange that the RRQ is on * * TODO: fix error handler. */ @@ -1664,21 +1836,99 @@ cleanup: fc_exch_release(aborted_ep); } -/* - * Send ELS RRQ - Reinstate Recovery Qualifier. + +/** + * fc_exch_seq_send() - Send a frame using a new exchange and sequence + * @lport: The local port to send the frame on + * @fp: The frame to be sent + * @resp: The response handler for this request + * @destructor: The destructor for the exchange + * @arg: The argument to be passed to the response handler + * @timer_msec: The timeout period for the exchange + * + * The frame pointer with some of the header's fields must be + * filled before calling this routine, those fields are: + * + * - routing control + * - FC port did + * - FC port sid + * - FC header type + * - frame control + * - parameter or relative offset + */ +static struct fc_seq *fc_exch_seq_send(struct fc_lport *lport, + struct fc_frame *fp, + void (*resp)(struct fc_seq *, + struct fc_frame *fp, + void *arg), + void (*destructor)(struct fc_seq *, + void *), + void *arg, u32 timer_msec) +{ + struct fc_exch *ep; + struct fc_seq *sp = NULL; + struct fc_frame_header *fh; + int rc = 1; + + ep = fc_exch_alloc(lport, fp); + if (!ep) { + fc_frame_free(fp); + return NULL; + } + ep->esb_stat |= ESB_ST_SEQ_INIT; + fh = fc_frame_header_get(fp); + fc_exch_set_addr(ep, ntoh24(fh->fh_s_id), ntoh24(fh->fh_d_id)); + ep->resp = resp; + ep->destructor = destructor; + ep->arg = arg; + ep->r_a_tov = FC_DEF_R_A_TOV; + ep->lp = lport; + sp = &ep->seq; + + ep->fh_type = fh->fh_type; /* save for possbile timeout handling */ + ep->f_ctl = ntoh24(fh->fh_f_ctl); + fc_exch_setup_hdr(ep, fp, ep->f_ctl); + sp->cnt++; + + if (ep->xid <= lport->lro_xid) + fc_fcp_ddp_setup(fr_fsp(fp), ep->xid); + + if (unlikely(lport->tt.frame_send(lport, fp))) + goto err; + + if (timer_msec) + fc_exch_timer_set_locked(ep, timer_msec); + ep->f_ctl &= ~FC_FC_FIRST_SEQ; /* not first seq */ + + if (ep->f_ctl & FC_FC_SEQ_INIT) + ep->esb_stat &= ~ESB_ST_SEQ_INIT; + spin_unlock_bh(&ep->ex_lock); + return sp; +err: + rc = fc_exch_done_locked(ep); + spin_unlock_bh(&ep->ex_lock); + if (!rc) + fc_exch_delete(ep); + return NULL; +} + +/** + * fc_exch_rrq() - Send an ELS RRQ (Reinstate Recovery Qualifier) command + * @ep: The exchange to send the RRQ on + * * This tells the remote port to stop blocking the use of * the exchange and the seq_cnt range. */ static void fc_exch_rrq(struct fc_exch *ep) { - struct fc_lport *lp; + struct fc_lport *lport; struct fc_els_rrq *rrq; struct fc_frame *fp; u32 did; - lp = ep->lp; + lport = ep->lp; - fp = fc_frame_alloc(lp, sizeof(*rrq)); + fp = fc_frame_alloc(lport, sizeof(*rrq)); if (!fp) goto retry; @@ -1694,10 +1944,11 @@ static void fc_exch_rrq(struct fc_exch *ep) did = ep->sid; fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, did, - fc_host_port_id(lp->host), FC_TYPE_ELS, + fc_host_port_id(lport->host), FC_TYPE_ELS, FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); - if (fc_exch_seq_send(lp, fp, fc_exch_rrq_resp, NULL, ep, lp->e_d_tov)) + if (fc_exch_seq_send(lport, fp, fc_exch_rrq_resp, NULL, ep, + lport->e_d_tov)) return; retry: @@ -1714,12 +1965,14 @@ retry: } -/* - * Handle incoming ELS RRQ - Reset Recovery Qualifier. +/** + * fc_exch_els_rrq() - Handler for ELS RRQ (Reset Recovery Qualifier) requests + * @sp: The sequence that the RRQ is on + * @fp: The RRQ frame */ static void fc_exch_els_rrq(struct fc_seq *sp, struct fc_frame *fp) { - struct fc_exch *ep; /* request or subject exchange */ + struct fc_exch *ep = NULL; /* request or subject exchange */ struct fc_els_rrq *rp; u32 sid; u16 xid; @@ -1769,17 +2022,24 @@ static void fc_exch_els_rrq(struct fc_seq *sp, struct fc_frame *fp) * Send LS_ACC. */ fc_seq_ls_acc(sp); - fc_frame_free(fp); - return; + goto out; unlock_reject: spin_unlock_bh(&ep->ex_lock); - fc_exch_release(ep); /* drop hold from fc_exch_find */ reject: fc_seq_ls_rjt(sp, ELS_RJT_LOGIC, explan); +out: fc_frame_free(fp); + if (ep) + fc_exch_release(ep); /* drop hold from fc_exch_find */ } +/** + * fc_exch_mgr_add() - Add an exchange manager to a local port's list of EMs + * @lport: The local port to add the exchange manager to + * @mp: The exchange manager to be added to the local port + * @match: The match routine that indicates when this EM should be used + */ struct fc_exch_mgr_anchor *fc_exch_mgr_add(struct fc_lport *lport, struct fc_exch_mgr *mp, bool (*match)(struct fc_frame *)) @@ -1799,6 +2059,10 @@ struct fc_exch_mgr_anchor *fc_exch_mgr_add(struct fc_lport *lport, } EXPORT_SYMBOL(fc_exch_mgr_add); +/** + * fc_exch_mgr_destroy() - Destroy an exchange manager + * @kref: The reference to the EM to be destroyed + */ static void fc_exch_mgr_destroy(struct kref *kref) { struct fc_exch_mgr *mp = container_of(kref, struct fc_exch_mgr, kref); @@ -1808,6 +2072,10 @@ static void fc_exch_mgr_destroy(struct kref *kref) kfree(mp); } +/** + * fc_exch_mgr_del() - Delete an EM from a local port's list + * @ema: The exchange manager anchor identifying the EM to be deleted + */ void fc_exch_mgr_del(struct fc_exch_mgr_anchor *ema) { /* remove EM anchor from EM anchors list */ @@ -1817,7 +2085,35 @@ void fc_exch_mgr_del(struct fc_exch_mgr_anchor *ema) } EXPORT_SYMBOL(fc_exch_mgr_del); -struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *lp, +/** + * fc_exch_mgr_list_clone() - Share all exchange manager objects + * @src: Source lport to clone exchange managers from + * @dst: New lport that takes references to all the exchange managers + */ +int fc_exch_mgr_list_clone(struct fc_lport *src, struct fc_lport *dst) +{ + struct fc_exch_mgr_anchor *ema, *tmp; + + list_for_each_entry(ema, &src->ema_list, ema_list) { + if (!fc_exch_mgr_add(dst, ema->mp, ema->match)) + goto err; + } + return 0; +err: + list_for_each_entry_safe(ema, tmp, &dst->ema_list, ema_list) + fc_exch_mgr_del(ema); + return -ENOMEM; +} + +/** + * fc_exch_mgr_alloc() - Allocate an exchange manager + * @lport: The local port that the new EM will be associated with + * @class: The default FC class for new exchanges + * @min_xid: The minimum XID for exchanges from the new EM + * @max_xid: The maximum XID for exchanges from the new EM + * @match: The match routine for the new EM + */ +struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *lport, enum fc_class class, u16 min_xid, u16 max_xid, bool (*match)(struct fc_frame *)) @@ -1830,7 +2126,7 @@ struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *lp, if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN || (min_xid & fc_cpu_mask) != 0) { - FC_LPORT_DBG(lp, "Invalid min_xid 0x:%x and max_xid 0x:%x\n", + FC_LPORT_DBG(lport, "Invalid min_xid 0x:%x and max_xid 0x:%x\n", min_xid, max_xid); return NULL; } @@ -1873,7 +2169,7 @@ struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *lp, } kref_init(&mp->kref); - if (!fc_exch_mgr_add(lp, mp, match)) { + if (!fc_exch_mgr_add(lport, mp, match)) { free_percpu(mp->pool); goto free_mempool; } @@ -1894,76 +2190,26 @@ free_mp: } EXPORT_SYMBOL(fc_exch_mgr_alloc); +/** + * fc_exch_mgr_free() - Free all exchange managers on a local port + * @lport: The local port whose EMs are to be freed + */ void fc_exch_mgr_free(struct fc_lport *lport) { struct fc_exch_mgr_anchor *ema, *next; + flush_workqueue(fc_exch_workqueue); list_for_each_entry_safe(ema, next, &lport->ema_list, ema_list) fc_exch_mgr_del(ema); } EXPORT_SYMBOL(fc_exch_mgr_free); - -struct fc_seq *fc_exch_seq_send(struct fc_lport *lp, - struct fc_frame *fp, - void (*resp)(struct fc_seq *, - struct fc_frame *fp, - void *arg), - void (*destructor)(struct fc_seq *, void *), - void *arg, u32 timer_msec) -{ - struct fc_exch *ep; - struct fc_seq *sp = NULL; - struct fc_frame_header *fh; - int rc = 1; - - ep = fc_exch_alloc(lp, fp); - if (!ep) { - fc_frame_free(fp); - return NULL; - } - ep->esb_stat |= ESB_ST_SEQ_INIT; - fh = fc_frame_header_get(fp); - fc_exch_set_addr(ep, ntoh24(fh->fh_s_id), ntoh24(fh->fh_d_id)); - ep->resp = resp; - ep->destructor = destructor; - ep->arg = arg; - ep->r_a_tov = FC_DEF_R_A_TOV; - ep->lp = lp; - sp = &ep->seq; - - ep->fh_type = fh->fh_type; /* save for possbile timeout handling */ - ep->f_ctl = ntoh24(fh->fh_f_ctl); - fc_exch_setup_hdr(ep, fp, ep->f_ctl); - sp->cnt++; - - if (ep->xid <= lp->lro_xid) - fc_fcp_ddp_setup(fr_fsp(fp), ep->xid); - - if (unlikely(lp->tt.frame_send(lp, fp))) - goto err; - - if (timer_msec) - fc_exch_timer_set_locked(ep, timer_msec); - ep->f_ctl &= ~FC_FC_FIRST_SEQ; /* not first seq */ - - if (ep->f_ctl & FC_FC_SEQ_INIT) - ep->esb_stat &= ~ESB_ST_SEQ_INIT; - spin_unlock_bh(&ep->ex_lock); - return sp; -err: - rc = fc_exch_done_locked(ep); - spin_unlock_bh(&ep->ex_lock); - if (!rc) - fc_exch_delete(ep); - return NULL; -} -EXPORT_SYMBOL(fc_exch_seq_send); - -/* - * Receive a frame +/** + * fc_exch_recv() - Handler for received frames + * @lport: The local port the frame was received on + * @fp: The received frame */ -void fc_exch_recv(struct fc_lport *lp, struct fc_frame *fp) +void fc_exch_recv(struct fc_lport *lport, struct fc_frame *fp) { struct fc_frame_header *fh = fc_frame_header_get(fp); struct fc_exch_mgr_anchor *ema; @@ -1971,8 +2217,8 @@ void fc_exch_recv(struct fc_lport *lp, struct fc_frame *fp) u16 oxid; /* lport lock ? */ - if (!lp || lp->state == LPORT_ST_DISABLED) { - FC_LPORT_DBG(lp, "Receiving frames for an lport that " + if (!lport || lport->state == LPORT_ST_DISABLED) { + FC_LPORT_DBG(lport, "Receiving frames for an lport that " "has not been initialized correctly\n"); fc_frame_free(fp); return; @@ -1981,7 +2227,7 @@ void fc_exch_recv(struct fc_lport *lp, struct fc_frame *fp) f_ctl = ntoh24(fh->fh_f_ctl); oxid = ntohs(fh->fh_ox_id); if (f_ctl & FC_FC_EX_CTX) { - list_for_each_entry(ema, &lp->ema_list, ema_list) { + list_for_each_entry(ema, &lport->ema_list, ema_list) { if ((oxid >= ema->mp->min_xid) && (oxid <= ema->mp->max_xid)) { found = 1; @@ -1990,13 +2236,13 @@ void fc_exch_recv(struct fc_lport *lp, struct fc_frame *fp) } if (!found) { - FC_LPORT_DBG(lp, "Received response for out " + FC_LPORT_DBG(lport, "Received response for out " "of range oxid:%hx\n", oxid); fc_frame_free(fp); return; } } else - ema = list_entry(lp->ema_list.prev, typeof(*ema), ema_list); + ema = list_entry(lport->ema_list.prev, typeof(*ema), ema_list); /* * If frame is marked invalid, just drop it. @@ -2015,37 +2261,56 @@ void fc_exch_recv(struct fc_lport *lp, struct fc_frame *fp) else if (f_ctl & FC_FC_SEQ_CTX) fc_exch_recv_resp(ema->mp, fp); else - fc_exch_recv_req(lp, ema->mp, fp); + fc_exch_recv_req(lport, ema->mp, fp); break; default: - FC_LPORT_DBG(lp, "dropping invalid frame (eof %x)", fr_eof(fp)); + FC_LPORT_DBG(lport, "dropping invalid frame (eof %x)", + fr_eof(fp)); fc_frame_free(fp); } } EXPORT_SYMBOL(fc_exch_recv); -int fc_exch_init(struct fc_lport *lp) +/** + * fc_exch_init() - Initialize the exchange layer for a local port + * @lport: The local port to initialize the exchange layer for + */ +int fc_exch_init(struct fc_lport *lport) { - if (!lp->tt.seq_start_next) - lp->tt.seq_start_next = fc_seq_start_next; + if (!lport->tt.seq_start_next) + lport->tt.seq_start_next = fc_seq_start_next; - if (!lp->tt.exch_seq_send) - lp->tt.exch_seq_send = fc_exch_seq_send; + if (!lport->tt.exch_seq_send) + lport->tt.exch_seq_send = fc_exch_seq_send; - if (!lp->tt.seq_send) - lp->tt.seq_send = fc_seq_send; + if (!lport->tt.seq_send) + lport->tt.seq_send = fc_seq_send; - if (!lp->tt.seq_els_rsp_send) - lp->tt.seq_els_rsp_send = fc_seq_els_rsp_send; + if (!lport->tt.seq_els_rsp_send) + lport->tt.seq_els_rsp_send = fc_seq_els_rsp_send; - if (!lp->tt.exch_done) - lp->tt.exch_done = fc_exch_done; + if (!lport->tt.exch_done) + lport->tt.exch_done = fc_exch_done; - if (!lp->tt.exch_mgr_reset) - lp->tt.exch_mgr_reset = fc_exch_mgr_reset; + if (!lport->tt.exch_mgr_reset) + lport->tt.exch_mgr_reset = fc_exch_mgr_reset; - if (!lp->tt.seq_exch_abort) - lp->tt.seq_exch_abort = fc_seq_exch_abort; + if (!lport->tt.seq_exch_abort) + lport->tt.seq_exch_abort = fc_seq_exch_abort; + + return 0; +} +EXPORT_SYMBOL(fc_exch_init); + +/** + * fc_setup_exch_mgr() - Setup an exchange manager + */ +int fc_setup_exch_mgr() +{ + fc_em_cachep = kmem_cache_create("libfc_em", sizeof(struct fc_exch), + 0, SLAB_HWCACHE_ALIGN, NULL); + if (!fc_em_cachep) + return -ENOMEM; /* * Initialize fc_cpu_mask and fc_cpu_order. The @@ -2069,20 +2334,17 @@ int fc_exch_init(struct fc_lport *lp) } fc_cpu_mask--; - return 0; -} -EXPORT_SYMBOL(fc_exch_init); - -int fc_setup_exch_mgr(void) -{ - fc_em_cachep = kmem_cache_create("libfc_em", sizeof(struct fc_exch), - 0, SLAB_HWCACHE_ALIGN, NULL); - if (!fc_em_cachep) + fc_exch_workqueue = create_singlethread_workqueue("fc_exch_workqueue"); + if (!fc_exch_workqueue) return -ENOMEM; return 0; } -void fc_destroy_exch_mgr(void) +/** + * fc_destroy_exch_mgr() - Destroy an exchange manager + */ +void fc_destroy_exch_mgr() { + destroy_workqueue(fc_exch_workqueue); kmem_cache_destroy(fc_em_cachep); } |