Depending on device capabilities use different methods to implement it.
Currently used method can be read/set via kern.cam.da.X.delete_method
sysctls. Possible values are:
NONE - no provisioning support reported by the device;
DISABLE - provisioning support was disabled because of errors;
ZERO - use WRITE SAME (10) command to write zeroes;
WS10 - use WRITE SAME (10) command with UNMAP bit set;
WS16 - use WRITE SAME (16) command with UNMAP bit set;
UNMAP - use UNMAP command (equivalent of the ATA DSM TRIM command).
The last two methods (UNMAP and WS16) are defined by SBC specification and
the UNMAP method is the most advanced one. The rest of methods I've found
supported in Linux, and as soon as they were trivial to implement, then
why not? Hope they will be useful in some cases.
Unluckily I have no devices properly reporting parameters of the logical
block provisioning support via respective VPD pages (0xB0 and 0xB2). So
all info I have/use now is the flag telling whether logical block
provisioning is supported or not. As result, specific methods chosen now
by trying different ones in order (UNMAP, WS16, DISABLE) and checking
completion status to fallback if needed. I don't expect problems from this,
as if something go wrong, it should just disable itself. It may disable
even too aggressively if only some command parameter misfit.
Unlike Linux, which executes each delete with separate request, I've
implemented here the same request aggregation as implemented in ada driver.
Tests on SSDs I have show much better results doing it this way: above
8GB/s of the linear delete on Intel SATA SSD on LSI SAS HBA (mps).
Reviewed by: silence on scsi@
MFC after: 2 month
Sponsored by: iXsystems, Inc.
1. as reported by Alexander Fiveg, the allocator was reporting
half of the allocated memory. Fix this by exiting from the
loop earlier (not too critical because this code is going
away soon).
2. following a discussion on freebsd-current
http://lists.freebsd.org/pipermail/freebsd-current/2012-January/031144.html
turns out that (re)loading the dmamap was expensive and not optimized.
This operation is in the critical path when doing zero-copy forwarding
between interfaces.
At least on netmap and i386/amd64, the bus_dmamap_load can be
completely bypassed if the map is NULL, so we do it.
The latter change gives an almost 3x improvement in forwarding
performance, from the previous 9.5Mpps at 2.9GHz to the current
line rate (14.2Mpps) at 1.733GHz. (this is for 64+4 byte packets,
in other configurations the PCIe bus is a bottleneck).
for pidfh in libutil.h in its place.
This allows us to hide the contents of the pidfh structure, and also
allowed removal of the "#ifdef _SYS_PARAM_H" guard from around the
pidfile_* function prototypes.
Suggested by pjd.
802.1q-defined 16-bit VID, CFI, and PCP field in host by order) and a
VLAN ID (VID). Tags go in packets. VIDs identify VLANs.
No functional change is intended, so this should be safe to MFC. Further
cleanup with functional changes will be committed separately (for example,
renaming vlan_tag/vlan_tag_p, which modify the KPI and KBI).
Reviewed by: bz
Sponsored by: ADARA Networks, Inc.
MFC after: 3 days
This version is similar to the code shipped with libgcc. It is based on
the code from the SPARC64 architecture manual, provided without any
restrictions.
Tested by: flo@
SPARC and MIPS CPUs don't have special instructions to count
leading/trailing zeroes. The compiler-rt library provides fallback
rountines for these. The 64-bit routines, __clzdi2 and __ctzdi2, are
implemented as simple wrappers around the compiler built-in
__builtin_clz(), assuming these will expand to either 32-bit
CPU instructions or calls to __clzsi2 and __ctzsi2.
Unfortunately, our GCC 4.2 probably thinks that because the operand is
stored in a 64-bit register, it might just be a better idea to invoke
its 64-bit equivalent, simply resulting into endless recursion. Fix this
by defining __builtin_clz and __builtin_ctz to __clzsi2 and __ctzsi2
explicitly.
Document the current semantics of the 'quiet' command prefix
in the rc.subr(8).
Fix dhclient rc.d script: it should not call err() for
non-DHCP-enabled interface when it is called from devd, because the
latter just blindly calls 'service dhclient quietstart' on each "link
up" event.
Since the 'quietstart' will silence the message "Cannot 'start' <foo>.
Set <foo>_enable to YES in /etc/rc.conf or use 'onestart' instead of
'start'." and running dhclient on the non-DHCP-enabled interface is
the same thing as running the service <foo> without <foo>_enable set,
such modification is in sync with the current semantics of the 'quiet'
prefix.
Approved by: glebius
Reviewed by: freebsd-rc list
MFC after: 2 weeks
installing zoneinfo. While we're in the vicinity, add some missing
error checking to eliminate an unhelpful error message when unlink()
fails.
/me is embarrassed by the quality of his 16-year-old code.
The whole thing is awful and could stand a complete rewrite.
PR: 164038
Submitted by: Devin Teske (but implemented differently)
in the CAM XPT bus traversal code, and a number of other periph level
issues.
cam_periph.h,
cam_periph.c: Modify cam_periph_acquire() to test the CAM_PERIPH_INVALID
flag prior to allowing a reference count to be gained
on a peripheral. Callers of this function will receive
CAM_REQ_CMP_ERR status in the situation of attempting to
reference an invalidated periph. This guarantees that
a peripheral scheduled for a deferred free will not
be accessed during its wait for destruction.
Panic during attempts to drop a reference count on
a peripheral that already has a zero reference count.
In cam_periph_list(), use a local sbuf with SBUF_FIXEDLEN
set so that mallocs do not occur while the xpt topology
lock is held, regardless of the allocation policy of the
passed in sbuf.
Add a new routine, cam_periph_release_locked_buses(),
that can be called when the caller already holds
the CAM topology lock.
Add some extra debugging for duplicate peripheral
allocations in cam_periph_alloc().
Treat CAM_DEV_NOT_THERE much the same as a selection
timeout (AC_LOST_DEVICE is emitted), but forgo retries.
cam_xpt.c: Revamp the way the EDT traversal code does locking
and reference counting. This was broken, since it
assumed that the EDT would not change during
traversal, but that assumption is no longer valid.
So, to prevent devices from going away while we
traverse the EDT, make sure we properly lock
everything and hold references on devices that
we are using.
The two peripheral driver traversal routines should
be examined. xptpdperiphtraverse() holds the
topology lock for the entire time it runs.
xptperiphtraverse() is now locked properly, but
only holds the topology lock while it is traversing
the list, and not while the traversal function is
running.
The bus locking code in xptbustraverse() should
also be revisited at a later time, since it is
complex and should probably be simplified.
scsi_da.c: Pay attention to the return value from cam_periph_acquire().
Return 0 always from daclose() even if the disk is now gone.
Add some rudimentary error injection support.
scsi_sg.c: Fix reference counting in the sg(4) driver.
The sg driver was calling cam_periph_release() on close,
but never called cam_periph_acquire() (which increments
the reference count) on open.
The periph code correctly complained that the sg(4)
driver was trying to decrement the refcount when it
was already 0.
Sponsored by: Spectra Logic
MFC after: 2 weeks
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
This uses the emuxkireg.h already used in the emu10k1
snd driver. Special thanks go to Alexander Motin as
he was able to find some errors and reverse engineer
some wrong values in the emuxkireg header.
The emu10kx driver is now free from the GPL.
PR: 153901
Tested by: mav, joel
Approved by: jhb (mentor)
MFC after: 2 weeks
- Define schednetisr() to swi_sched.
- In the swi handler check if there is some data prepared,
and if true, then call pfsync_sendout(), however tell it
not to schedule swi again.
- Since now we don't obtain the pfsync lock in the swi handler,
don't use ifqueue mutex to synchronize queue access.
This introduces:
* a basic wtap interface
* a HAL, which implements an abstraction layer for implementing
different device behavious;
* A visibility plugin, which allows for control over which nodes
see other nodes (useful for mesh work.)
It doesn't yet implement sta/adhoc/hostap modes but these are quite
feasible to implement.
Monthadar uses it to do 802.11s mesh verification.
The userland tools will be committed in a follow-up commit.
Submitted by: Monthadar Al Jaberi <monthadar@gmail.com>
Add the ability for /dev/null and /dev/zero to accept
being set into non blocking mode via fcntl(). This
brings the code into compliance with IEEE Std 1003.1-2001
as referenced in another PR, 94729.
Reviewed by: jhb
MFC after: 1 week
revision 1.128
date: 2009/08/16 13:01:57; author: jsg; state: Exp; lines: +1 -5
remove prototypes of a bunch of functions that had their implementations
removed in pfsync v5.
