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authorKrishna Gudipati <kgudipat@brocade.com>2011-12-20 18:58:32 -0800
committerJames Bottomley <JBottomley@Parallels.com>2012-01-10 17:01:24 -0600
commit5b7db7af522d9f281ff8bf540d2b5cbea2206b27 (patch)
tree7e2b2750a13a5ee9794d1893a0b575419cde95cf /drivers/scsi/bfa/bfad_im.h
parent8ca2dd87e7f29df99389e9dc41f7a45a35223672 (diff)
[SCSI] bfa: Implement LUN Masking feature using the SCSI Slave Callouts.
This patch re-implements LUN Masking feature using SCSI Slave Callouts. With the new design in the slave_alloc entry point; for each new LUN discovered we check with our internal LUN Masking config whether to expose or to mask this particular LUN. We return -ENXIO (No such device or address) from slave_alloc for the LUNs we don't want to be exposed. We also notify the SCSI mid-layer to do a sequential LUN scan rather than REPORT_LUNS based scan if LUN masking is enabled on our HBA port, since a -ENXIO from any LUN in REPORT_LUNS based scan translates to a scan abort. This patch also handles the dynamic lun masking config change from enable to disable or vice-versa by resetting sdev_bflags of LUN 0 appropriately. Signed-off-by: Krishna Gudipati <kgudipat@brocade.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi/bfa/bfad_im.h')
-rw-r--r--drivers/scsi/bfa/bfad_im.h27
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/scsi/bfa/bfad_im.h b/drivers/scsi/bfa/bfad_im.h
index 004b6cf848d9..0814367ef101 100644
--- a/drivers/scsi/bfa/bfad_im.h
+++ b/drivers/scsi/bfa/bfad_im.h
@@ -91,6 +91,7 @@ struct bfad_itnim_s {
struct fc_rport *fc_rport;
struct bfa_itnim_s *bfa_itnim;
u16 scsi_tgt_id;
+ u16 channel;
u16 queue_work;
unsigned long last_ramp_up_time;
unsigned long last_queue_full_time;
@@ -166,4 +167,30 @@ irqreturn_t bfad_intx(int irq, void *dev_id);
int bfad_im_bsg_request(struct fc_bsg_job *job);
int bfad_im_bsg_timeout(struct fc_bsg_job *job);
+/*
+ * Macro to set the SCSI device sdev_bflags - sdev_bflags are used by the
+ * SCSI mid-layer to choose LUN Scanning mode REPORT_LUNS vs. Sequential Scan
+ *
+ * Internally iterate's over all the ITNIM's part of the im_port & set's the
+ * sdev_bflags for the scsi_device associated with LUN #0.
+ */
+#define bfad_reset_sdev_bflags(__im_port, __lunmask_cfg) do { \
+ struct scsi_device *__sdev = NULL; \
+ struct bfad_itnim_s *__itnim = NULL; \
+ u32 scan_flags = BLIST_NOREPORTLUN | BLIST_SPARSELUN; \
+ list_for_each_entry(__itnim, &((__im_port)->itnim_mapped_list), \
+ list_entry) { \
+ __sdev = scsi_device_lookup((__im_port)->shost, \
+ __itnim->channel, \
+ __itnim->scsi_tgt_id, 0); \
+ if (__sdev) { \
+ if ((__lunmask_cfg) == BFA_TRUE) \
+ __sdev->sdev_bflags |= scan_flags; \
+ else \
+ __sdev->sdev_bflags &= ~scan_flags; \
+ scsi_device_put(__sdev); \
+ } \
+ } \
+} while (0)
+
#endif