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| author | FUJITA Tomonori <tomof@acm.org> | 2007-07-11 10:08:17 +0400 |
|---|---|---|
| committer | James Bottomley <jejb@mulgrave.localdomain> | 2007-10-12 22:37:50 +0400 |
| commit | 2c47f9efbedbe5749b6bb16e59bc11d6e460855f (patch) | |
| tree | bfc1a2154f67c3aa45f92e586678ffc37e5f80eb /include/scsi/scsi_transport.h | |
| parent | aebd5e476ecc8ceb53577b20f2a352ff4ceffd8d (diff) | |
| download | linux-2c47f9efbedbe5749b6bb16e59bc11d6e460855f.tar.xz | |
[SCSI] tgt: add I_T nexus support
tgt uses scsi_host as I_T nexus. This works for ibmvstgt because it
creates one scsi_host for one initiator. However, other target drivers
don't work like that.
This adds I_T nexus support, which enable one scsi_host to handle
multiple initiators. New scsi_tgt_it_nexus_create/destroy functions
are expected be called transport classes. For example, ibmvstgt
creates an initiator remote port, then the srp transport calls
tgt_it_nexus_create. tgt doesn't manages I_T nexus, instead it tells
tgtd, user-space daemon, to create a new I_T nexus.
On the receiving the response from tgtd, tgt calls
shost->transportt->it_nexus_response. transports should notify a
lld. The srp transport uses it_nexus_response callback in
srp_function_template to do that.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Diffstat (limited to 'include/scsi/scsi_transport.h')
| -rw-r--r-- | include/scsi/scsi_transport.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/scsi/scsi_transport.h b/include/scsi/scsi_transport.h index 3c18baa65a72..af5b3e15e64e 100644 --- a/include/scsi/scsi_transport.h +++ b/include/scsi/scsi_transport.h @@ -65,6 +65,12 @@ struct scsi_transport_template { * EH_NOT_HANDLED Begin normal error recovery */ enum scsi_eh_timer_return (* eh_timed_out)(struct scsi_cmnd *); + + /* + * Used as callback for the completion of i_t_nexus request + * for target drivers. + */ + int (* it_nexus_response)(struct Scsi_Host *, u64, int); }; #define transport_class_to_shost(tc) \ |