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[SCSI] libfc: add interface to allocate a sequence for incoming requests

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For incoming ELS and FCP requests, we often don't require an
exchange and sequence, however, sometimes we do.  For those cases,
(primarily FCP requests for targets) add a function to set up
the exchange and sequence.

Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Joe Eykholt 2010-07-20 15:21:07 -07:00 committed by James Bottomley
parent 24f089e2f2
commit 239e81048b
2 changed files with 32 additions and 0 deletions
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25
drivers/scsi/libfc/fc_exch.c
View File

@ -1230,6 +1230,28 @@ free:
fc_frame_free(rx_fp);
}
/**
* fc_seq_assign() - Assign exchange and sequence for incoming request
* @lport: The local port that received the request
* @fp: The request frame
*
* On success, the sequence pointer will be returned and also in fr_seq(@fp).
*/
static struct fc_seq *fc_seq_assign(struct fc_lport *lport, struct fc_frame *fp)
{
struct fc_exch_mgr_anchor *ema;
WARN_ON(lport != fr_dev(fp));
WARN_ON(fr_seq(fp));
fr_seq(fp) = NULL;
list_for_each_entry(ema, &lport->ema_list, ema_list)
if ((!ema->match || ema->match(fp)) &&
fc_seq_lookup_recip(lport, ema->mp, fp) != FC_RJT_NONE)
break;
return fr_seq(fp);
}
/**
* fc_exch_recv_req() - Handler for an incoming request where is other
* end is originating the sequence
@ -2283,6 +2305,9 @@ int fc_exch_init(struct fc_lport *lport)
if (!lport->tt.seq_exch_abort)
lport->tt.seq_exch_abort = fc_seq_exch_abort;
if (!lport->tt.seq_assign)
lport->tt.seq_assign = fc_seq_assign;
return 0;
}
EXPORT_SYMBOL(fc_exch_init);

7
include/scsi/libfc.h
View File

@ -555,6 +555,13 @@ struct libfc_function_template {
*/
struct fc_seq *(*seq_start_next)(struct fc_seq *);
/*
* Assign a sequence for an incoming request frame.
*
* STATUS: OPTIONAL
*/
struct fc_seq *(*seq_assign)(struct fc_lport *, struct fc_frame *);
/*
* Reset an exchange manager, completing all sequences and exchanges.
* If s_id is non-zero, reset only exchanges originating from that FID.