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Bug #5305
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libsmp doesn't return correct errno when expander device is gone
Status:
New
Priority:
Normal
Assignee:
-
Category:
lib - userland libraries
Start date:
2014-11-10
Due date:
% Done:
0%
Estimated time:
Difficulty:
Bite-size
Tags:
needs-triage
Gerrit CR:
External Bug:
Description
If the result of SMP passthru request is MPI2_IOCSTATUS_SCSI_DEVICE_NOT_THERE, mpt_sas will return ENODEV to the SCSA framework. And SMP target driver will pass the errno to caller (e.g. libsmp).
/* do passthrough success, check the smp status */
if (LE_16(rep.IOCStatus) != MPI2_IOCSTATUS_SUCCESS) {
switch (LE_16(rep.IOCStatus)) {
case MPI2_IOCSTATUS_SCSI_DEVICE_NOT_THERE:
smp_pkt->smp_pkt_reason = ENODEV;
break;
https://github.com/illumos/illumos-gate/blob/master/usr/src/uts/common/io/scsi/targets/smp.c#L524
default:
smp_log(smp_state, CE_NOTE,
"!smp_transport failed, smp_pkt_reason %d",
smp_pkt->smp_pkt_reason);
rval = smp_pkt->smp_pkt_reason;
goto copyout;
libsmp doesn't check or pass ENODEV, so userland application won't know the reason of failed SMP request.
if (ioctl(dp->ud_fd, USMPFUNC, &cmd) < 0) {
ASSERT(errno != EFAULT);
switch (errno) {
case EINVAL:
return (smp_error(ESMP_BADFUNC, "internal usmp error"));
case EPERM:
return (smp_error(ESMP_PERM,
"insufficient privileges"));
case EIO:
return (smp_error(ESMP_IO, "I/O error"));
default:
return (smp_error(ESMP_SYS, "usmp ioctl failed: %s",
strerror(errno)));
}
}
Typically this issue can happen when expander device is removed but fail to offline in devinfo tree. Removed device fails to offline when there's kernel LDI or userland contract constraints.
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