- Removed references to SCST core internal state names.
- Does no longer accept new connections while unloading.
- Module unloading should now really no longer cause a hang.
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- Decreased number of target-to-initiator request send buffers from two
to one such that a clear error message can be printed when the SRP
initiator did not respond to the SRP_CRED_REQ information unit.
- Bug fix: don't modify ch->last_response_req_lim when sending an SRP
information unit that contains the REQUEST LIMIT DELTA field failed.
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- Bug fix: don't set the REQUEST LIMIT DELTA field to SRPT_RQ_SIZE when
sending the first reponse to the initiator but to the proper value
(a small integer).
- An SRP_CRED_REQ information unit is now sent to the initiator if the
number of I/O contexts available for receiving dropped below two I/O
contexts (see also the SRP standard for more information). This change
is required to fix the SRP initiator lockup that happens when the
initiator sends requests faster than the target can process them. In
order to fix the lockup, it is also necessary to implement SRP_CRED_REQ
support in the SRP initiator in the vanilla Linux kernel and in OFED.
Neither kernel version 2.6.32 nor OFED 1.5 nor any previous
version of these components supports SRP_CRED_REQ information units.
See also http://bugzilla.kernel.org/show_bug.cgi?id=14235 for more
information about the initiator lockup.
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document:
* For some Linux distro's the command iscsi-iname is installed in /usr/sbin
and for others in /sbin.
* The scst and scst_vdisk modules must be loaded before the sample scstadmin
commands work.
Signed-off-by: Bart Van Assche <bart.vanassche@gmail.com>
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function scst_sysfs_cleanup() is declared as an exit-only function while it is
also called from init_scst(). The patch below fixes this section mismatch.
This patch has been tested by verifying that the following command does not
report any section mismatches:
make CONFIG_DEBUG_SECTION_MISMATCH=y scst iscsi-scst srpt
Signed-off-by: Bart Van Assche <bart.vanassche@gmail.com>
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- Convert sense data to/from fixed format / descriptor format before
sending back a response.
- Print an error message to the kernel log when an unsupported IB event
has been received.
- Return the SCSI status BUSY instead of CHECK CONDITION when allocating
an SCST command failed (until r1409, the SCSI status in the SRP_RSP
information unit was set to TASK SET FULL in this case).
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- Fixed: the SCSOLNT and UCSOLNT bits were ignored in received SRP requests,
and the SOLNT bit was not set in responses when required. This is required
by the SRP protocol specification.
- Fixed: SRP_RSP messages must be limited to the MAXIMUM TARGET TO INITIATOR
IU LENGTH field indicated in the SRP_LOGIN_RSP response instead of the
maximum message size supported by SRPT. This is also required by the SRP
protocol specification.
- Fixed: the STATUS field of response messages with status GOOD and that
contain sense data is no longer modified into CHECK CONDITION.
Internal changes (refactoring):
- Replaced the SCSI sense data handling data structures and code in SRPT by
those of the SCST core.
- Moved the code for building an error response from srpt_handle_cmd() and
srpt_handle_tsk_mgmt() to srpt_handle_new_iu().
- Removed the ioctx::data_len member.
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the minus character in the following expression:
tgt_dev->curr_sn = (typeof(tgt_dev->curr_sn)) -300
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- Made sure that the SRPT source code compiles again on systems with a 2.6.29
or older kernel.
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descriptors are now reported by returning -EINVAL instead of setting the
third argument to true. Removed the third argument of this function.
- Added support for SRP_CMD requests with non-zero ADDITIONAL CDB LENGTH.
Note: support for these requests has not yet been tested -- I do not know
of any SRP initiator that generates such requests.
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- Changed default value of srp_max_message_size from 4096 to 2116. This
size corresponds to the size of an SRP_CMD request message containing
an indirect buffer list with 128 elements.
- A warning is now printed when an SRP_CMD request is received containing
more than one CDB -- this kind of messages is not yet supported.
- Switched back from multiple ib_dma_sync_single_for_cpu() calls to a
single call because the latter results in better performance.
- An error message is now printed if a corrupt SRP_CMD request has been
received. Before these were ignored silently.
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