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scsi: storvsc: Support manual scans for all Hyper-V targets

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The Fibre Channel transport topology created by storvsc exposes only one
dummy remote port per SCSI host. Its scsi_target_id is always zero.

As a result, the FC transport user-scan path looks up the remote port
using target ID 0. It cannot initiate a scan for Target 1 or higher. No
SCSI command is therefore sent to Hyper-V when userspace explicitly
requests a scan of one of these targets.

storvsc itself supports up to STORVSC_FC_MAX_TARGETS and already passes
scmnd->device->id to Hyper-V as vm_srb->target_id. Devices on Target 1
and higher work when initially discovered. They can also be rediscovered
by a full host scan, such as the scan triggered after an FC port bounce.

Provide a storvsc-specific user_scan callback that uses the exported
scsi_scan_target() interface. Iterate over the requested channel and
target ranges so that wildcard and explicitly addressed scans retain the
expected SCSI sysfs scan semantics.

This bypasses the single-rport lookup in fc_user_scan() and allows
userspace to explicitly scan any target supported by storvsc without
requiring one synthetic fc_rport for every Hyper-V target.

Signed-off-by: Laurence Oberman <loberman@redhat.com>
Link: https://patch.msgid.link/20260723163743.1274830-1-loberman@redhat.com
Signed-off-by: Martin K. Petersen (Oracle) <mkp@kernel.org>
This commit is contained in:
Laurence Oberman 2026-07-23 12:37:43 -04:00 committed by Martin K. Petersen (Oracle)
parent 8368367590
commit 4c84c2e08a
1 changed files with 32 additions and 0 deletions
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32
drivers/scsi/storvsc_drv.c
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@ -520,6 +520,36 @@ static void storvsc_host_scan(struct work_struct *work)
scsi_scan_host(host);
}
#if IS_ENABLED(CONFIG_SCSI_FC_ATTRS)
static int storvsc_user_scan(struct Scsi_Host *host,
unsigned int channel,
unsigned int id,
u64 lun)
{
unsigned int first_channel, last_channel;
unsigned int first_id, end_id;
unsigned int ch, target;
if ((channel != SCAN_WILD_CARD && channel > host->max_channel) ||
(id != SCAN_WILD_CARD && id >= host->max_id) ||
(lun != SCAN_WILD_CARD && lun >= host->max_lun))
return -EINVAL;
first_channel = channel == SCAN_WILD_CARD ? 0 : channel;
last_channel = channel == SCAN_WILD_CARD ? host->max_channel : channel;
first_id = id == SCAN_WILD_CARD ? 0 : id;
end_id = id == SCAN_WILD_CARD ? host->max_id : id + 1;
for (ch = first_channel; ch <= last_channel; ch++) {
for (target = first_id; target < end_id; target++)
scsi_scan_target(&host->shost_gendev, ch, target, lun,
SCSI_SCAN_MANUAL);
}
return 0;
}
#endif
static void storvsc_remove_lun(struct work_struct *work)
{
struct storvsc_scan_work *wrk;
@ -2232,6 +2262,8 @@ static int __init storvsc_drv_init(void)
fc_transport_template = fc_attach_transport(&fc_transport_functions);
if (!fc_transport_template)
return -ENODEV;
fc_transport_template->user_scan = storvsc_user_scan;
#endif
ret = vmbus_driver_register(&storvsc_drv);