13 Jun, 2009
1 commit
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Attached is the ELS/CT pass-thru patch for the FC Transport. The patch
creates a generic framework that lays on top of bsg and the SGIO v4 ioctl
in order to pass transaction requests to LLDD's.The interface supports the following operations:
On an fc_host basis:
Request login to the specified N_Port_ID, creating an fc_rport.
Request logout of the specified N_Port_ID, deleting an fc_rport
Send ELS request to specified N_Port_ID w/o requiring a login, and
wait for ELS response.
Send CT request to specified N_Port_ID and wait for CT response.
Login is required, but LLDD is allowed to manage login and decide
whether it stays in place after the request is satisfied.
Vendor-Unique request. Allows a LLDD-specific request to be passed
to the LLDD, and the passing of a response back to the application.
On an fc_rport basis:
Send ELS request to nport and wait for ELS response.
Send CT request to nport and wait for CT response.The patch also exports several headers from include/scsi such that
they can be available to user-space applications:
include/scsi/scsi.h
include/scsi/scsi_netlink.h
include/scsi/scsi_netlink_fc.h
include/scsi/scsi_bsg_fc.hFor further information, refer to the last RFC:
http://marc.info/?l=linux-scsi&m=123436574018579&w=2Note: Documentation is still spotty and will be added later.
[bharrosh@panasas.com: update for new block API]
Signed-off-by: James Smart
Signed-off-by: James Bottomley
09 Oct, 2008
1 commit
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Right now SCSI and others do their own command timeout handling.
Move those bits to the block layer.Instead of having a timer per command, we try to be a bit more clever
and simply have one per-queue. This avoids the overhead of having to
tear down and setup a timer for each command, so it will result in a lot
less timer fiddling.Signed-off-by: Mike Anderson
Signed-off-by: Jens Axboe
27 Jul, 2008
2 commits
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Controllers that support protection information must indicate this to
the SCSI midlayer so that the ULD can prepare scsi_cmnds accordingly.This patch implements a host mask and various types of protection:
- DIF Type 1-3 (between HBA and disk)
- DIX Type 0-3 (between OS and HBA)The patch also allows the HBA to set the guard type to something
different than the T10-mandated CRC.Signed-off-by: Martin K. Petersen
Signed-off-by: James Bottomley -
Daniel Debonzi reports that he has managed to wrap host_no. Increasing
the number of host numbers available to 32-bit from 16-bit allows the
problem to be evaded for another hundred years.Signed-off-by: Matthew Wilcox
Signed-off-by: James Bottomley
22 Jul, 2008
1 commit
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Kobjects do not have a limit in name size since a while, so stop
pretending that they do.Signed-off-by: Kay Sievers
Signed-off-by: Greg Kroah-Hartman
03 May, 2008
1 commit
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Add support for variable-length, extended, and vendor specific
CDBs to scsi-ml. It is now possible for initiators and ULD's
to issue these types of commands. LLDs need not change much.
All they need is to raise the .max_cmd_len to the longest command
they support (see iscsi patch).- clean-up some code paths that did not expect commands to be
larger than 16, and change cmd_len members' type to short as
char is not enough.Signed-off-by: Boaz Harrosh
Signed-off-by: Benny Halevy
Signed-off-by: James Bottomley
20 Apr, 2008
1 commit
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It's big, but there doesn't seem to be a way to split it up smaller...
Signed-off-by: Tony Jones
Signed-off-by: Kay Sievers
Cc: Roland Dreier
Cc: Sean Hefty
Cc: Hal Rosenstock
Cc: James Bottomley
Signed-off-by: Greg Kroah-Hartman
08 Apr, 2008
1 commit
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The problem is that serveral drivers are sending a target reset from the
device reset handler, and if we have multiple devices a target reset gets
sent for each device when only one would be sufficient. And if we do a target
reset it affects all the commands on the target so the device reset handler
code only cleaning up one devices's commands makes programming the driver a
little more difficult than it should be.This patch adds a target reset handler, which drivers can use to send
a target reset. If successful it cleans up the commands for a devices
accessed through that starget.Signed-off-by: Mike Christie
Signed-off-by: James Bottomley
12 Feb, 2008
1 commit
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Since the sg chaining patches went in, our current value of 255 for
SG_ALL excites chaining on some drivers which cannot support it (and
would thus oops). Redefine SG_ALL to mean no sg table size
preference, but use the single allocation (non chained) limit. This
also helps for drivers that use it to size an internal table.We'll do an opt in system later where truly chaining supporting
drivers can define their sg_tablesize to be anything up to
SCSI_MAX_SG_CHAIN_ELEMENTS.Signed-off-by: James Bottomley
08 Feb, 2008
1 commit
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Small cleanups in scsi_host.h. Few #defines make me wonder if their
description is still up to date..?Signed-off-by: Pavel Machek
Signed-off-by: Andrew Morton
Signed-off-by: James Bottomley
31 Jan, 2008
2 commits
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With the sg table code, every SCSI driver is now either chain capable
or broken (or has sg_tablesize set so chaining is never activated), so
there's no need to have a check in the host template.Also tidy up the code by moving the scatterlist size defines into the
SCSI includes and permit the last entry of the scatterlist pools not
to be a power of two.
Signed-off-by: James Bottomley -
In preparation for bidi we abstract all IO members of scsi_cmnd,
that will need to duplicate, into a substructure.- Group all IO members of scsi_cmnd into a scsi_data_buffer
structure.
- Adjust accessors to new members.
- scsi_{alloc,free}_sgtable receive a scsi_data_buffer instead of
scsi_cmnd. And work on it.
- Adjust scsi_init_io() and scsi_release_buffers() for above
change.
- Fix other parts of scsi_lib/scsi.c to members migration. Use
accessors where appropriate.- fix Documentation about scsi_cmnd in scsi_host.h
- scsi_error.c
* Changed needed members of struct scsi_eh_save.
* Careful considerations in scsi_eh_prep/restore_cmnd.- sd.c and sr.c
* sd and sr would adjust IO size to align on device's block
size so code needs to change once we move to scsi_data_buff
implementation.
* Convert code to use scsi_for_each_sg
* Use data accessors where appropriate.- tgt: convert libsrp to use scsi_data_buffer
- isd200: This driver still bangs on scsi_cmnd IO members,
so need changing[jejb: rebased on top of sg_table patches fixed up conflicts
and used the synergy to eliminate use_sg and sg_count]Signed-off-by: Boaz Harrosh
Signed-off-by: FUJITA Tomonori
Signed-off-by: James Bottomley
16 Oct, 2007
1 commit
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This option is true if a low-level driver can support sg
chaining. This will be removed eventually when all the drivers are
converted to support sg chaining. q->max_phys_segments is set to
SCSI_MAX_SG_SEGMENTS if false.Signed-off-by: FUJITA Tomonori
Signed-off-by: Jens Axboe
13 Oct, 2007
4 commits
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The pid field is a duplicate of the serial_number field and has been
scheduled for removal for a long time. A few drivers were still using
it, so just change them to use serial_number instead.Signed-off-by: Matthew Wilcox
Signed-off-by: James Bottomley -
This adds supported_mode and active_mode attributes to
/sys/class/sys_host/hostX/ for specifying the mode that a lld supports
and the currently activated mode. The output format is similar to fc
rport roles:luce:/sys/class/scsi_host/host0$ cat supported_mode
Initiator
luce:/sys/class/scsi_host/host0$ cat active_mode
InitiatorThe mode values uses bitmap since we would support dual-mode llds in
the future like this:luce:/sys/class/scsi_host/host0$ cat supported_mode
Initiator, TargetThe supported_mode attribute looks at a scsi_host_template and the
active_mode attribute looks at a scsi_host. We would add a hook to a
scsi_host_template to change the active_mode attribute
dynamically. But now there is no hook since no lld supports that
feature.Signed-off-by: FUJITA Tomonori
Signed-off-by: Mike Christie
Signed-off-by: James Bottomley -
This moves tsk_mgmt_response callback in struct scsi_host_template to
struct scsi_transport_template since struct scsi_transport_template is
more suitable for the task management stuff.Signed-off-by: FUJITA Tomonori
Signed-off-by: Mike Christie
Signed-off-by: James Bottomley -
tgt uses scsi_host as I_T nexus. This works for ibmvstgt because it
creates one scsi_host for one initiator. However, other target drivers
don't work like that.This adds I_T nexus support, which enable one scsi_host to handle
multiple initiators. New scsi_tgt_it_nexus_create/destroy functions
are expected be called transport classes. For example, ibmvstgt
creates an initiator remote port, then the srp transport calls
tgt_it_nexus_create. tgt doesn't manages I_T nexus, instead it tells
tgtd, user-space daemon, to create a new I_T nexus.On the receiving the response from tgtd, tgt calls
shost->transportt->it_nexus_response. transports should notify a
lld. The srp transport uses it_nexus_response callback in
srp_function_template to do that.Signed-off-by: FUJITA Tomonori
Signed-off-by: Mike Christie
Signed-off-by: James Bottomley
20 Jul, 2007
1 commit
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Signed-off-by: Kristian Høgsberg
collapsed with fw-sbp2 patch "Drop cast to non-const char * in host
template initialization." from Kristian HøgsbergSigned-off-by: Stefan Richter
Signed-off-by: James Bottomley
01 Jun, 2007
1 commit
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Currently accessing the scsi host private data is rather messy because
it comes as an unsigned long that always needs a cast first. This patch
introduces a helper that does the cast called shost_priv. It's similar
in spirit to netdev_priv for network drivers.This is the first patch introducing the macro, and the second patch
in the series will convert esp and it's subdrivers as an example.
Further conversion will wait until the helper is in the tree to make
patch juggling easier.Signed-off-by: Christoph Hellwig
Signed-off-by: James Bottomley
22 May, 2007
1 commit
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With libata converted to use sdev->manage_start_stop for suspend and
resume, sht->suspend/resume() has no user left and low level
suspend/ressume should be taken care of by low level driver's
suspend/resume callbacks (e.g. PCI or PCMCIA driver callbacks). This
patch removes sht->suspend/resume() callbacks.This change is suggested by Christoph Hellwig.
Signed-off-by: Tejun Heo
Cc: Christoph Hellwig
Signed-off-by: James Bottomley
20 Mar, 2007
1 commit
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It looks like megaraid_sas at least needs this to throttle its commands
as they begin to time out. The code keeps the existing transport
template use of eh_timed_out (and allows the transport to override the
host if they both have this callback).Signed-off-by: James Bottomley
12 Mar, 2007
1 commit
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This patch simplify the way to notify LLDs of the command completion
and addresses the following sense buffer problems:- can't handle both data and sense.
- forces user-space to use aligned sense buffertgt copies sense_data from userspace to cmnd->sense_buffer (if
necessary), maps user-space pages (if necessary) and then calls
host->transfer_response (host->transfer_data is removed).Signed-off-by: FUJITA Tomonori
Signed-off-by: Mike Christie
Signed-off-by: James Bottomley
26 Nov, 2006
1 commit
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This patch contains the needed changes to the scsi-ml for the target
mode support.Note, per the last review we moved almost all the fields we added
to the scsi_cmnd to our internal data structure which we are going
to try and kill off when we can replace it with support from other
parts of the kernel.The one field we left on was the offset variable. This is needed to handle
the case where the target gets request that is so large that it cannot
execute it in one dma operation. So max_secotors or a segment limit may
limit the size of the transfer. In this case our tgt core code will
break up the command into managable transfers and send them to the
LLD one at a time. The offset is then used to tell the LLD where in
the command we are at. Is there another field on the scsi_cmd for
that?Signed-off-by: Mike Christie
Signed-off-by: FUJITA Tomonori
Signed-off-by: James Bottomley
23 Nov, 2006
1 commit
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If a driver can find its own targets, it can now fill in scan_finished and
(optionally) scan_start in the scsi_host_template. Then, when it calls
scsi_scan_host(), it will be called back (from a thread if asynchronous
discovery is enabled), first to start the scan, and then at intervals to
check if the scan is completed.Also make scsi_prep_async_scan and scsi_finish_async_scan static.
Signed-off-by: Matthew Wilcox
Signed-off-by: James Bottomley
16 Nov, 2006
1 commit
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scsi_assign_lock has been unused for a long time and is a bad idea
in general, so kill it.Signed-off-by: Christoph Hellwig
Signed-off-by: James Bottomley
12 Oct, 2006
1 commit
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Since it often takes around 20-30 seconds to scan a scsi bus, it's
highly advantageous to do this in parallel with other things. The bulk
of this patch is ensuring that devices don't change numbering, and that
all devices are discovered prior to trying to start init. For those
who build SCSI as modules, there's a new scsi_wait_scan module that will
ensure all bus scans are finished.This patch only handles drivers which call scsi_scan_host. Fibre Channel,
SAS, SATA, USB and Firewire all need additional work.Signed-off-by: Matthew Wilcox
Signed-off-by: James Bottomley
31 Aug, 2006
1 commit
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This patch adds support for sharing tag maps at the host level
(i.e. either every queue [LUN] has its own tag map or there's a single
one for the entire host). This formulation is primarily intended to
help single issue queue hardware, like the aic7xxxSigned-off-by: James Bottomley
27 Jun, 2006
1 commit
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The scsi midlayer portion of the patch
Signed-off-by: James Smart
Signed-off-by: James Bottomley
15 May, 2006
1 commit
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libata needs to invoke EH without scmd. This patch adds
shost->host_eh_scheduled to implement such behavior.Currently the only user of this feature is libata and no general
interface is defined. This patch simply adds handling for
host_eh_scheduled where needed and exports scsi_eh_wakeup() to
modules. The rest is upto libata. This is the result of the
following discussion.http://thread.gmane.org/gmane.linux.scsi/23853/focus=9760
In short, SCSI host is not supposed to know about exceptions unrelated
to specific device or command. Such exceptions should be handled by
transport layer proper. However, the distinction is not essential to
ATA and libata is planning to depart from SCSI, so, for the time
being, libata will be using SCSI EH to handle such exceptions.Signed-off-by: Tejun Heo
11 Apr, 2006
1 commit
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Overriding the whole EH code is a per-transport, not per-host thing.
Move ->eh_strategy_handler to the transport class, same as
->eh_timed_out.Downside is that scsi_host_alloc can't check for the total lack of EH
anymore, but the transition period from old EH where we needed it is
long gone already.Signed-off-by: Christoph Hellwig
Signed-off-by: Jeff Garzik
24 Mar, 2006
1 commit
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At the moment libata doesn't pass pm_message_t down ata_device_suspend.
This causes drives to be powered down when we just want a freeze,
causing unnecessary wear and tear. This patch gets pm_message_t passed
down so that it can be used to determine whether to power down the
drive.Signed-off-by: Nigel Cunningham
drivers/scsi/libata-core.c | 5 +++--
drivers/scsi/libata-scsi.c | 4 ++--
drivers/scsi/scsi_sysfs.c | 2 +-
include/linux/libata.h | 4 ++--
include/scsi/scsi_host.h | 2 +-
5 files changed, 9 insertions(+), 8 deletions(-)
Signed-off-by: Jeff Garzik
13 Mar, 2006
1 commit
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This moves the eh_timed_out functionality from the scsi_host_template
to the transport_template. Given that this is now a transport function,
the EH_RESET_TIMER case no longer caps the timer reschedulings. The
transport guarantees that this is not an infinite condition.Signed-off-by: James Bottomley
25 Jan, 2006
1 commit
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After the recent overhaul of the block layer the variable
"ordered_flush" is no longer used.Signed-off-by: Tetsuo Takata
Signed-off-by: Jens Axboe
13 Jan, 2006
1 commit
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the scsi layer is using semaphores in a mutex way, this patch converts
these into using mutexes insteadSigned-off-by: Arjan van de Ven
Signed-off-by: James Bottomley
07 Jan, 2006
2 commits
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Manual fixup for merge with Jens' "Suspend support for libata", commit
ID 9b847548663ef1039dd49f0eb4463d001e596bc3.Signed-off-by: Linus Torvalds
-
This patch adds suspend patch to libata, and ata_piix in particular. For
most low level drivers, they should just need to add the 4 hooks to
work. As I can only test ata_piix, I didn't enable it for more
though.Suspend support is the single most important feature on a notebook, and
most new notebooks have sata drives. It's quite embarrassing that we
_still_ do not support this. Right now, it's perfectly possible to
suspend the drive in mid-transfer.Signed-off-by: Jens Axboe
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
06 Jan, 2006
1 commit
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All ordered request related stuff delegated to HLD. Midlayer
now doens't deal with ordered setting or prepare_flush
callback. sd.c updated to deal with blk_queue_ordered
setting. Currently, ordered tag isn't used as SCSI midlayer
cannot guarantee request ordering.Signed-off-by: Tejun Heo
Signed-off-by: Jens Axboe
07 Nov, 2005
2 commits
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scsi_send_eh_cmnd currently uses a semaphore and an overload of eh_timer
to either get a completion for a command for a timeout.
Switch to using a completion and wait_for_completion_timeout to simply
the code and not having to deal with the races ourselves.Signed-off-by: Christoph Hellwig
Signed-off-by: James Bottomley -
now that the abuse in qla2xxx is gone this field can be remove.
Signed-off-by: Christoph Hellwig
Signed-off-by: James Bottomley
29 Oct, 2005
1 commit
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Signed-off-by: James Bottomley
