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296373 |
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04-Mar-2016 |
marius |
- Copy stable/10@296371 to releng/10.3 in preparation for 10.3-RC1 builds. - Update newvers.sh to reflect RC1. - Update __FreeBSD_version to reflect 10.3. - Update default pkg(8) configuration to use the quarterly branch.
Approved by: re (implicit) |
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288811 |
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05-Oct-2015 |
mav |
MFC r288348: Umplement media load/eject support for removable devices.
In case of block backend eject really closes the backing store, while load tries to open it back. Failed store open is reported as no media.
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288798 |
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05-Oct-2015 |
mav |
MFC r288215: Switch I/O time accounting from system time to uptime.
While there, make num_dmas accounted independently of CTL_TIME_IO.
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288790 |
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05-Oct-2015 |
mav |
MFC r288148: Synchronize mode pages between HA peers.
We allow to modify only few fields in mode pages now, but still it is not good if they unexpectedly change during failover. Also this fixes reporting of "Mode parameters changed" UAs on secondary node.
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288789 |
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05-Oct-2015 |
mav |
MFC r288146: Make HA peers announce their parameters on connect.
HA protocol requires strict version, parameters and configuration match. Differences there may cause full set of problems up to kernel panic. To avoid that, validate peer parameters on connect, and abort connection immediately if some mismatch detected.
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288781 |
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05-Oct-2015 |
mav |
MFC r288020: Remove couple excess SGLIST I/O flags.
Those flags duplicated respective (sg_entries > 0) values.
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288777 |
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05-Oct-2015 |
mav |
MFC r287991: Pack struct ctl_ha_msg_hdr by 8 bytes.
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288774 |
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05-Oct-2015 |
mav |
MFC r287967: Relax serseq option operation for reads.
Previously, with serseq enabled, next command was unblocked only after previous completed. With this change, for read operations, next command is unblocked as soon as last media read completed. This is important for frontends that actually wait for data move completion (like camtgt), or when data are moved through the HA link, or especially when both.
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288770 |
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05-Oct-2015 |
mav |
MFC r287940: Replicate initiators WWPNs and names between HA peers.
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288769 |
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05-Oct-2015 |
mav |
MFC r287933: Replicate port->init_devid to HA peer.
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288768 |
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05-Oct-2015 |
mav |
MFC r287921: When reporting TPT UA, report which of thresholds was reached.
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288755 |
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05-Oct-2015 |
mav |
MFC r287778: Remove CTL_PRIV_LBA_LEN from HA messages.
Previously it was used for statistics, but now just a 16 extra bytes.
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288754 |
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05-Oct-2015 |
mav |
MFC r287774: Implement QUERY TASK, QUERY TASK SET and QUERY ASYNC EVENT.
Now we support most of SAM-5 task management.
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288732 |
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05-Oct-2015 |
mav |
MFC r287621: Reimplement CTL High Availability.
CTL HA functionality was originally implemented by Copan many years ago, but large part of the sources was never published. This change includes clean room implementation of the missing code and fixes for many bugs.
This code supports dual-node HA with ALUA in four modes: - Active/Unavailable without interlink between nodes; - Active/Standby with second node handling only basic LUN discovery and reservation, synchronizing with the first node through the interlink; - Active/Active with both nodes processing commands and accessing the backing storage, synchronizing with the first node through the interlink; - Active/Active with second node working as proxy, transfering all commands to the first node for execution through the interlink.
Unlike original Copan's implementation, depending on specific hardware, this code uses simple custom TCP-based protocol for interlink. It has no authentication, so it should never be enabled on public interfaces.
The code may still need some polishing, but generally it is functional.
Relnotes: yes Sponsored by: iXsystems, Inc.
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288731 |
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05-Oct-2015 |
mav |
MFC r287620: Remove unused target and initiator IDs.
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288730 |
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05-Oct-2015 |
mav |
MFC r287618: Disable CTL_IO_DELAY feature.
It is too developer-oriented to be enabled by default.
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288723 |
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05-Oct-2015 |
mav |
MFC r287293: Remove 600 bytes of port_priv from struct ctl_io_hdr.
This field used only for camtgt frontend, and once it any way preallocates all requests, let it preallocate this memory too, not bothering core code.
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275881 |
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18-Dec-2014 |
mav |
MFC r275058: Coalesce last data move and command status for read commands.
Make CTL core and block backend set success status before initiating last data move for read commands. Make CAM target and iSCSI frontends detect such condition and send command status together with data. New I/O flag allows to skip duplicate status sending on later fe_done() call.
For Fibre Channel this change saves one of three interrupts per read command, increasing performance from 126K to 160K IOPS. For iSCSI this change saves one of three PDUs per read command, increasing performance from 1M to 1.2M IOPS.
Sponsored by: iXsystems, Inc.
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275878 |
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18-Dec-2014 |
mav |
MFC r274962: Replace home-grown CTL IO allocator with UMA.
Old allocator created significant lock congestion protecting its lists of preallocated I/Os, while UMA provides much better SMP scalability. The downside of UMA is lack of reliable preallocation, that could guarantee successful allocation in non-sleepable environments. But careful code review shown, that only CAM target frontend really has that requirement. Fix that making that frontend preallocate and statically bind CTL I/O for every ATIO/INOT it preallocates any way. That allows to avoid allocations in hot I/O path. Other frontends either may sleep in allocation context or can properly handle allocation errors.
On 40-core server with 6 ZVOL-backed LUNs and 7 iSCSI client connections this change increases peak performance from ~700K to >1M IOPS! Yay! :)
Sponsored by: iXsystems, Inc.
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273978 |
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02-Nov-2014 |
mav |
MFC r273075: Remove couple Copan's vendor-specific mode pages.
Those pages are highly system-/hardware-specific, the code is incomplete, and so they hardly can be useful for anybody else.
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272616 |
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06-Oct-2014 |
mav |
MFC r271309: Improve cache control support, including DPO/FUA flags and the mode page.
At this moment it works only for files and ZVOLs in device mode since BIOs have no respective respective cache control flags (DPO/FUA).
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269298 |
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30-Jul-2014 |
mav |
MFC r268808: Increase maximal number of SCSI ports in CTL from 32 to 128.
After I gave each iSCSI target its own port, the old limit appeared to be not so big. This change almost proportionally increases per-LUN memory use, but it is still three times better then it was before r268807.
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268697 |
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15-Jul-2014 |
mav |
MFC r268418: Enable TAS feature: notify initiator if its command was aborted by other.
That should make operation more kind to multi-initiator environment. Without this, other initiators may find out that something bad happened to their commands only via command timeout.
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268690 |
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15-Jul-2014 |
mav |
MFC r268353: Implement ABORT TASK SET and I_T NEXUS RESET task management functions.
Use the last one to terminate active commands on iSCSI session termination. Previous code was aborting only commands doing some data moves.
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268685 |
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15-Jul-2014 |
mav |
MFC r268307: Move lun_map() method from command nexus to port.
Previous implementation made impossible to do some things, such as calling it for ports other then one through which command arrived.
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268556 |
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12-Jul-2014 |
mav |
MFC r267643, r267873, r268391, r268398: Introduce fine-grained CTL locking to improve SMP scalability.
Split global ctl_lock, historically protecting most of CTL context: - remaining ctl_lock now protects lists of fronends and backends; - per-LUN lun_lock(s) protect LUN-specific information; - per-thread queue_lock(s) protect request queues. This allows to radically reduce congestion on ctl_lock.
Create multiple worker threads, depending on number of CPUs, and assign each LUN to one of them. This allows to spread load between multiple CPUs, still avoiging congestion on queues and LUNs locks.
On 40-core server, exporting 5 LUNs, each backed by gstripe of SATA SSDs, accessed via 6 iSCSI connections, this change improves peak request rate from 250K to 680K IOPS.
Sponsored by: iXsystems, Inc.
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268151 |
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02-Jul-2014 |
mav |
MFC r267537: Add support for VERIFY(10/12/16) and COMPARE AND WRITE SCSI commands.
Make data_submit backends method support not only read and write requests, but also two new ones: verify and compare. Verify just checks readability of the data in specified location without transferring them outside. Compare reads the specified data and compares them to received data, returning error if they are different.
VERIFY(10/12/16) commands request either verify or compare from backend, depending on BYTCHK CDB field. COMPARE AND WRITE command executed in two stages: first it requests compare, and then, if succeesed, requests write. Atomicity of operation is guarantied by CTL request ordering code.
Sponsored by: iXsystems, Inc.
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268142 |
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02-Jul-2014 |
mav |
MFC r265323 (by trasz): Provide better descriptions for 'struct ctl_scsiio' fields; based mostly on emails from ken@.
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265634 |
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08-May-2014 |
mav |
MFC r264274, r264279, r264283, r264296, r264297: Add support for SCSI UNMAP commands to CTL.
This patch adds support for three new SCSI commands: UNMAP, WRITE SAME(10) and WRITE SAME(16). WRITE SAME commands support both normal write mode and UNMAP flag. To properly report UNMAP capabilities this patch also adds support for reporting two new VPD pages: Block limits and Logical Block Provisioning.
UNMAP support can be enabled per-LUN by adding "-o unmap=on" to `ctladm create` command line or "option unmap on" to lun sections of /etc/ctl.conf.
At this moment UNMAP supported for ramdisks and device-backed block LUNs. It was tested to work great with ZFS ZVOLs. For file-backed LUNs UNMAP support is unfortunately missing due to absence of respective VFS KPI.
Sponsored by: iXsystems, Inc
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256281 |
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10-Oct-2013 |
gjb |
Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.
Approved by: re (implicit) Sponsored by: The FreeBSD Foundation
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254759 |
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24-Aug-2013 |
trasz |
CTL changes required for iSCSI target, most notably LUN remapping and a mechanism to allow CTL frontends for retrieving LUN options.
Reviewed by: ken (earlier version)
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229997 |
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12-Jan-2012 |
ken |
Add the CAM Target Layer (CTL).
CTL is a disk and processor device emulation subsystem originally written for Copan Systems under Linux starting in 2003. It has been shipping in Copan (now SGI) products since 2005.
It was ported to FreeBSD in 2008, and thanks to an agreement between SGI (who acquired Copan's assets in 2010) and Spectra Logic in 2010, CTL is available under a BSD-style license. The intent behind the agreement was that Spectra would work to get CTL into the FreeBSD tree.
Some CTL features:
- Disk and processor device emulation. - Tagged queueing - SCSI task attribute support (ordered, head of queue, simple tags) - SCSI implicit command ordering support. (e.g. if a read follows a mode select, the read will be blocked until the mode select completes.) - Full task management support (abort, LUN reset, target reset, etc.) - Support for multiple ports - Support for multiple simultaneous initiators - Support for multiple simultaneous backing stores - Persistent reservation support - Mode sense/select support - Error injection support - High Availability support (1) - All I/O handled in-kernel, no userland context switch overhead.
(1) HA Support is just an API stub, and needs much more to be fully functional.
ctl.c: The core of CTL. Command handlers and processing, character driver, and HA support are here.
ctl.h: Basic function declarations and data structures.
ctl_backend.c, ctl_backend.h: The basic CTL backend API.
ctl_backend_block.c, ctl_backend_block.h: The block and file backend. This allows for using a disk or a file as the backing store for a LUN. Multiple threads are started to do I/O to the backing device, primarily because the VFS API requires that to get any concurrency.
ctl_backend_ramdisk.c: A "fake" ramdisk backend. It only allocates a small amount of memory to act as a source and sink for reads and writes from an initiator. Therefore it cannot be used for any real data, but it can be used to test for throughput. It can also be used to test initiators' support for extremely large LUNs.
ctl_cmd_table.c: This is a table with all 256 possible SCSI opcodes, and command handler functions defined for supported opcodes.
ctl_debug.h: Debugging support.
ctl_error.c, ctl_error.h: CTL-specific wrappers around the CAM sense building functions.
ctl_frontend.c, ctl_frontend.h: These files define the basic CTL frontend port API.
ctl_frontend_cam_sim.c: This is a CTL frontend port that is also a CAM SIM. This frontend allows for using CTL without any target-capable hardware. So any LUNs you create in CTL are visible in CAM via this port.
ctl_frontend_internal.c, ctl_frontend_internal.h: This is a frontend port written for Copan to do some system-specific tasks that required sending commands into CTL from inside the kernel. This isn't entirely relevant to FreeBSD in general, but can perhaps be repurposed.
ctl_ha.h: This is a stubbed-out High Availability API. Much more is needed for full HA support. See the comments in the header and the description of what is needed in the README.ctl.txt file for more details.
ctl_io.h: This defines most of the core CTL I/O structures. union ctl_io is conceptually very similar to CAM's union ccb.
ctl_ioctl.h: This defines all ioctls available through the CTL character device, and the data structures needed for those ioctls.
ctl_mem_pool.c, ctl_mem_pool.h: Generic memory pool implementation used by the internal frontend.
ctl_private.h: Private data structres (e.g. CTL softc) and function prototypes. This also includes the SCSI vendor and product names used by CTL.
ctl_scsi_all.c, ctl_scsi_all.h: CTL wrappers around CAM sense printing functions.
ctl_ser_table.c: Command serialization table. This defines what happens when one type of command is followed by another type of command.
ctl_util.c, ctl_util.h: CTL utility functions, primarily designed to be used from userland. See ctladm for the primary consumer of these functions. These include CDB building functions.
scsi_ctl.c: CAM target peripheral driver and CTL frontend port. This is the path into CTL for commands from target-capable hardware/SIMs.
README.ctl.txt: CTL code features, roadmap, to-do list.
usr.sbin/Makefile: Add ctladm.
ctladm/Makefile, ctladm/ctladm.8, ctladm/ctladm.c, ctladm/ctladm.h, ctladm/util.c: ctladm(8) is the CTL management utility. It fills a role similar to camcontrol(8). It allow configuring LUNs, issuing commands, injecting errors and various other control functions.
usr.bin/Makefile: Add ctlstat.
ctlstat/Makefile ctlstat/ctlstat.8, ctlstat/ctlstat.c: ctlstat(8) fills a role similar to iostat(8). It reports I/O statistics for CTL.
sys/conf/files: Add CTL files.
sys/conf/NOTES: Add device ctl.
sys/cam/scsi_all.h: To conform to more recent specs, the inquiry CDB length field is now 2 bytes long.
Add several mode page definitions for CTL.
sys/cam/scsi_all.c: Handle the new 2 byte inquiry length.
sys/dev/ciss/ciss.c, sys/dev/ata/atapi-cam.c, sys/cam/scsi/scsi_targ_bh.c, scsi_target/scsi_cmds.c, mlxcontrol/interface.c: Update for 2 byte inquiry length field.
scsi_da.h: Add versions of the format and rigid disk pages that are in a more reasonable format for CTL.
amd64/conf/GENERIC, i386/conf/GENERIC, ia64/conf/GENERIC, sparc64/conf/GENERIC: Add device ctl.
i386/conf/PAE: The CTL frontend SIM at least does not compile cleanly on PAE.
Sponsored by: Copan Systems, SGI and Spectra Logic MFC after: 1 month
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