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[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>
This commit is contained in:
Krishna Gudipati 2011-12-20 18:58:32 -08:00 committed by James Bottomley
parent 8ca2dd87e7
commit 5b7db7af52
6 changed files with 112 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/scsi/bfa/bfad.c
View File

@ -674,6 +674,7 @@ bfad_vport_create(struct bfad_s *bfad, u16 vf_id,
spin_lock_irqsave(&bfad->bfad_lock, flags);
bfa_fcs_vport_start(&vport->fcs_vport);
list_add_tail(&vport->list_entry, &bfad->vport_list);
spin_unlock_irqrestore(&bfad->bfad_lock, flags);
return BFA_STATUS_OK;
@ -1404,6 +1405,7 @@ bfad_pci_probe(struct pci_dev *pdev, const struct pci_device_id *pid)
bfad->ref_count = 0;
bfad->pport.bfad = bfad;
INIT_LIST_HEAD(&bfad->pbc_vport_list);
INIT_LIST_HEAD(&bfad->vport_list);
/* Setup the debugfs node for this bfad */
if (bfa_debugfs_enable)

2
drivers/scsi/bfa/bfad_attr.c
View File

@ -491,7 +491,7 @@ bfad_im_vport_delete(struct fc_vport *fc_vport)
free_scsi_host:
bfad_scsi_host_free(bfad, im_port);
list_del(&vport->list_entry);
kfree(vport);
return 0;

27
drivers/scsi/bfa/bfad_bsg.c
View File

@ -2394,6 +2394,21 @@ bfad_iocmd_vf_clr_stats(struct bfad_s *bfad, void *cmd)
return 0;
}
/* Function to reset the LUN SCAN mode */
static void
bfad_iocmd_lunmask_reset_lunscan_mode(struct bfad_s *bfad, int lunmask_cfg)
{
struct bfad_im_port_s *pport_im = bfad->pport.im_port;
struct bfad_vport_s *vport = NULL;
/* Set the scsi device LUN SCAN flags for base port */
bfad_reset_sdev_bflags(pport_im, lunmask_cfg);
/* Set the scsi device LUN SCAN flags for the vports */
list_for_each_entry(vport, &bfad->vport_list, list_entry)
bfad_reset_sdev_bflags(vport->drv_port.im_port, lunmask_cfg);
}
int
bfad_iocmd_lunmask(struct bfad_s *bfad, void *pcmd, unsigned int v_cmd)
{
@ -2401,11 +2416,17 @@ bfad_iocmd_lunmask(struct bfad_s *bfad, void *pcmd, unsigned int v_cmd)
unsigned long flags;
spin_lock_irqsave(&bfad->bfad_lock, flags);
if (v_cmd == IOCMD_FCPIM_LUNMASK_ENABLE)
if (v_cmd == IOCMD_FCPIM_LUNMASK_ENABLE) {
iocmd->status = bfa_fcpim_lunmask_update(&bfad->bfa, BFA_TRUE);
else if (v_cmd == IOCMD_FCPIM_LUNMASK_DISABLE)
/* Set the LUN Scanning mode to be Sequential scan */
if (iocmd->status == BFA_STATUS_OK)
bfad_iocmd_lunmask_reset_lunscan_mode(bfad, BFA_TRUE);
} else if (v_cmd == IOCMD_FCPIM_LUNMASK_DISABLE) {
iocmd->status = bfa_fcpim_lunmask_update(&bfad->bfa, BFA_FALSE);
else if (v_cmd == IOCMD_FCPIM_LUNMASK_CLEAR)
/* Set the LUN Scanning mode to default REPORT_LUNS scan */
if (iocmd->status == BFA_STATUS_OK)
bfad_iocmd_lunmask_reset_lunscan_mode(bfad, BFA_FALSE);
} else if (v_cmd == IOCMD_FCPIM_LUNMASK_CLEAR)
iocmd->status = bfa_fcpim_lunmask_clear(&bfad->bfa);
spin_unlock_irqrestore(&bfad->bfad_lock, flags);
return 0;

2
drivers/scsi/bfa/bfad_drv.h
View File

@ -43,6 +43,7 @@
#include <scsi/scsi_transport_fc.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_bsg_fc.h>
#include <scsi/scsi_devinfo.h>
#include "bfa_modules.h"
#include "bfa_fcs.h"
@ -227,6 +228,7 @@ struct bfad_s {
struct list_head active_aen_q;
struct bfa_aen_entry_s aen_list[BFA_AEN_MAX_ENTRY];
spinlock_t bfad_aen_spinlock;
struct list_head vport_list;
};
/* BFAD state machine events */

56
drivers/scsi/bfa/bfad_im.c
View File

@ -917,6 +917,37 @@ bfad_get_itnim(struct bfad_im_port_s *im_port, int id)
return NULL;
}
/*
* Function is invoked from the SCSI Host Template slave_alloc() entry point.
* Has the logic to query the LUN Mask database to check if this LUN needs to
* be made visible to the SCSI mid-layer or not.
*
* Returns BFA_STATUS_OK if this LUN needs to be added to the OS stack.
* Returns -ENXIO to notify SCSI mid-layer to not add this LUN to the OS stack.
*/
static int
bfad_im_check_if_make_lun_visible(struct scsi_device *sdev,
struct fc_rport *rport)
{
struct bfad_itnim_data_s *itnim_data =
(struct bfad_itnim_data_s *) rport->dd_data;
struct bfa_s *bfa = itnim_data->itnim->bfa_itnim->bfa;
struct bfa_rport_s *bfa_rport = itnim_data->itnim->bfa_itnim->rport;
struct bfa_lun_mask_s *lun_list = bfa_get_lun_mask_list(bfa);
int i = 0, ret = -ENXIO;
for (i = 0; i < MAX_LUN_MASK_CFG; i++) {
if (lun_list[i].state == BFA_IOIM_LUN_MASK_ACTIVE &&
scsilun_to_int(&lun_list[i].lun) == sdev->lun &&
lun_list[i].rp_tag == bfa_rport->rport_tag &&
lun_list[i].lp_tag == (u8)bfa_rport->rport_info.lp_tag) {
ret = BFA_STATUS_OK;
break;
}
}
return ret;
}
/*
* Scsi_Host template entry slave_alloc
*/
@ -924,10 +955,33 @@ static int
bfad_im_slave_alloc(struct scsi_device *sdev)
{
struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
struct bfad_itnim_data_s *itnim_data =
(struct bfad_itnim_data_s *) rport->dd_data;
struct bfa_s *bfa = itnim_data->itnim->bfa_itnim->bfa;
if (!rport || fc_remote_port_chkready(rport))
return -ENXIO;
if (bfa_get_lun_mask_status(bfa) == BFA_LUNMASK_ENABLED) {
/*
* We should not mask LUN 0 - since this will translate
* to no LUN / TARGET for SCSI ml resulting no scan.
*/
if (sdev->lun == 0) {
sdev->sdev_bflags |= BLIST_NOREPORTLUN |
BLIST_SPARSELUN;
goto done;
}
/*
* Query LUN Mask configuration - to expose this LUN
* to the SCSI mid-layer or to mask it.
*/
if (bfad_im_check_if_make_lun_visible(sdev, rport) !=
BFA_STATUS_OK)
return -ENXIO;
}
done:
sdev->hostdata = rport->dd_data;
return 0;
@ -1037,6 +1091,8 @@ bfad_im_fc_rport_add(struct bfad_im_port_s *im_port, struct bfad_itnim_s *itnim)
&& (fc_rport->scsi_target_id < MAX_FCP_TARGET))
itnim->scsi_tgt_id = fc_rport->scsi_target_id;
itnim->channel = fc_rport->channel;
return;
}

27
drivers/scsi/bfa/bfad_im.h
View File

@ -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