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authorVasu Dev <vasu.dev@intel.com>2009-07-29 20:05:00 -0400
committerJames Bottomley <James.Bottomley@suse.de>2009-08-22 18:52:07 -0400
commit96316099ac3cb259eac2d6891f3c75b38b29d26e (patch)
treef4ec7001462bd00340de19b3045063872652c5a6 /include/scsi
parent201e5795b7b9582accb6d83316e30f24d7d40fd3 (diff)
[SCSI] fcoe, libfc: adds exchange manager(EM) anchor list per lport and related APIs
Adds EM list using a anchor struct fc_exch_mgr_anchor, anchor is used to allow same EM instance sharing across more than one lport on a eth device, this implementation is per discussed design posted at http://www.open-fcoe.org/pipermail/devel/2009-June/002566.html. The shared EM is required for multiple lports on eth device when using multiple VLANs or NPIV. Adds fc_exch_mgr_add API to add a EM to the lport and fc_exch_mgr_del API to delete previously added EM. Also adds function fc_exch_mgr_destroy() to destroy allocated EM. The kref is added to the EM to keep track of EM usage count, the EM is destroyed when no longer in use upon kref reaching to zero. The caller can specify match function to fc_exch_mgr_add, this will be used in determining exchange allocation from its EM or not. Moved calling of fcoe_em_config below fcoe_libfc_config calling, so that list head lp->ema_list is initialized before configuring EM. Signed-off-by: Vasu Dev <vasu.dev@intel.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to 'include/scsi')
-rw-r--r--include/scsi/libfc.h24
1 files changed, 24 insertions, 0 deletions
diff --git a/include/scsi/libfc.h b/include/scsi/libfc.h
index 04db7a9e631b..b381b1ca9aec 100644
--- a/include/scsi/libfc.h
+++ b/include/scsi/libfc.h
@@ -348,6 +348,7 @@ static inline bool fc_fcp_is_read(const struct fc_fcp_pkt *fsp)
348 */ 348 */
349 349
350struct fc_exch_mgr; 350struct fc_exch_mgr;
351struct fc_exch_mgr_anchor;
351 352
352/* 353/*
353 * Sequence. 354 * Sequence.
@@ -709,6 +710,7 @@ struct fc_lport {
709 /* Associations */ 710 /* Associations */
710 struct Scsi_Host *host; 711 struct Scsi_Host *host;
711 struct fc_exch_mgr *emp; 712 struct fc_exch_mgr *emp;
713 struct list_head ema_list;
712 struct fc_rport *dns_rp; 714 struct fc_rport *dns_rp;
713 struct fc_rport *ptp_rp; 715 struct fc_rport *ptp_rp;
714 void *scsi_priv; 716 void *scsi_priv;
@@ -964,6 +966,28 @@ int fc_elsct_init(struct fc_lport *lp);
964int fc_exch_init(struct fc_lport *lp); 966int fc_exch_init(struct fc_lport *lp);
965 967
966/* 968/*
969 * Adds Exchange Manager (EM) mp to lport.
970 *
971 * Adds specified mp to lport using struct fc_exch_mgr_anchor,
972 * the struct fc_exch_mgr_anchor allows same EM sharing by
973 * more than one lport with their specified match function,
974 * the match function is used in allocating exchange from
975 * added mp.
976 */
977struct fc_exch_mgr_anchor *fc_exch_mgr_add(struct fc_lport *lport,
978 struct fc_exch_mgr *mp,
979 bool (*match)(struct fc_frame *));
980
981/*
982 * Deletes Exchange Manager (EM) from lport by removing
983 * its anchor ema from lport.
984 *
985 * If removed anchor ema was the last user of its associated EM
986 * then also destroys associated EM.
987 */
988void fc_exch_mgr_del(struct fc_exch_mgr_anchor *ema);
989
990/*
967 * Allocates an Exchange Manager (EM). 991 * Allocates an Exchange Manager (EM).
968 * 992 *
969 * The EM manages exchanges for their allocation and 993 * The EM manages exchanges for their allocation and