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hyperv/stor: Verify returned inquiry data before further dispatching

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Windows 10 and Window 2016 will return all zero inquiry data for
non-existing slots.  If we dispatched them, then a lot of useless
(0 sized) disks would be created.  So we verify the returned inquiry
data (valid type, non-empty vendor/product/revision etc.), before
further dispatching.

Minor white space cleanup and wording fix.

Submitted by:		Hongjiang Zhang <honzhan microsoft com>
Reviewed by:		adrian, sephe, Jun Su <junsu microsoft com>
Approved by:		adrian (mentor)
Modified by:		sephe
Sponsored by:		Microsoft OSTC
Differential Revision:	https://reviews.freebsd.org/D4928
This commit is contained in:
Sepherosa Ziehau 2016-01-22 09:06:40 +00:00
parent 7b84bab04c
commit 1b44593c51
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=294557
1 changed files with 85 additions and 3 deletions
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88
sys/dev/hyperv/storvsc/hv_storvsc_drv_freebsd.c
View File

@ -1923,6 +1923,66 @@ create_storvsc_request(union ccb *ccb, struct hv_storvsc_request *reqp)
return(0);
}
/*
* Modified based on scsi_print_inquiry which is responsible to
* print the detail information for scsi_inquiry_data.
*
* Return 1 if it is valid, 0 otherwise.
*/
static inline int
is_inquiry_valid(const struct scsi_inquiry_data *inq_data)
{
uint8_t type;
char vendor[16], product[48], revision[16];
/*
* Check device type and qualifier
*/
if (!(SID_QUAL_IS_VENDOR_UNIQUE(inq_data) ||
SID_QUAL(inq_data) == SID_QUAL_LU_CONNECTED))
return (0);
type = SID_TYPE(inq_data);
switch (type) {
case T_DIRECT:
case T_SEQUENTIAL:
case T_PRINTER:
case T_PROCESSOR:
case T_WORM:
case T_CDROM:
case T_SCANNER:
case T_OPTICAL:
case T_CHANGER:
case T_COMM:
case T_STORARRAY:
case T_ENCLOSURE:
case T_RBC:
case T_OCRW:
case T_OSD:
case T_ADC:
break;
case T_NODEVICE:
default:
return (0);
}
/*
* Check vendor, product, and revision
*/
cam_strvis(vendor, inq_data->vendor, sizeof(inq_data->vendor),
sizeof(vendor));
cam_strvis(product, inq_data->product, sizeof(inq_data->product),
sizeof(product));
cam_strvis(revision, inq_data->revision, sizeof(inq_data->revision),
sizeof(revision));
if (strlen(vendor) == 0 ||
strlen(product) == 0 ||
strlen(revision) == 0)
return (0);
return (1);
}
/**
* @brief completion function before returning to CAM
*
@ -1993,11 +2053,33 @@ storvsc_io_done(struct hv_storvsc_request *reqp)
ccb->ccb_h.status &= ~CAM_SIM_QUEUED;
ccb->ccb_h.status &= ~CAM_STATUS_MASK;
if (vm_srb->scsi_status == SCSI_STATUS_OK) {
ccb->ccb_h.status |= CAM_REQ_CMP;
} else {
const struct scsi_generic *cmd;
/*
* Check whether the data for INQUIRY cmd is valid or
* not. Windows 10 and Windows 2016 send all zero
* inquiry data to VM even for unpopulated slots.
*/
cmd = (const struct scsi_generic *)
((ccb->ccb_h.flags & CAM_CDB_POINTER) ?
csio->cdb_io.cdb_ptr : csio->cdb_io.cdb_bytes);
if (cmd->opcode == INQUIRY &&
is_inquiry_valid(
(const struct scsi_inquiry_data *)csio->data_ptr) == 0) {
ccb->ccb_h.status |= CAM_DEV_NOT_THERE;
if (bootverbose) {
mtx_lock(&sc->hs_lock);
xpt_print(ccb->ccb_h.path,
"storvsc uninstalled device\n");
mtx_unlock(&sc->hs_lock);
}
} else {
ccb->ccb_h.status |= CAM_REQ_CMP;
}
} else {
mtx_lock(&sc->hs_lock);
xpt_print(ccb->ccb_h.path,
"srovsc scsi_status = %d\n",
"storvsc scsi_status = %d\n",
vm_srb->scsi_status);
mtx_unlock(&sc->hs_lock);
ccb->ccb_h.status |= CAM_SCSI_STATUS_ERROR;