Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

MFC r255120:
Bring legacy CAM target implementation back into API/KPI-coherent and even
functional state. While CTL is much more superior target from all points,
there is no reason why this code should not work.

MFC r237601:
r237601 | ken | 2012-06-26 08:51:35 -0600 (Tue, 26 Jun 2012) | 38 lines

Fix an issue that caused the kernel to panic inside CTL when trying
to attach to target capable HBAs that implement the old immediate
notify (XPT_IMMED_NOTIFY) and notify acknowledge (XPT_NOTIFY_ACK)
CCBs. The new API has been in place since SVN change 196008 in
2009.

The solution is two-fold: fix CTL to handle the responses from the
HBAs, and convert the HBA drivers in question to use the new API.

These drivers have not been tested with CTL, so how well they will
interoperate with CTL is unknown.

scsi_target.c:Update the userland target example code to use the
new immediate notify API.

scsi_ctl.c: Detect when an immediate notify CCB is returned
with CAM_REQ_INVALID or CAM_PROVIDE_FAIL status,
and just free it.

Fix a duplicate assignment.

aic79xx.c,
aic79xx_osm.c:Update the aic79xx driver to use the new API.
Target mode is not enabled on for this driver, so
the changes will have no practical effect.

aic7xxx.c,
aic7xxx_osm.c:Update the aic7xxx driver to use the new API.

sbp_targ.c: Update the firewire target code to work with the
new API.

mpt_cam.c: Update the mpt(4) driver to work with the new API.
Target mode is only enabled for Fibre Channel
mpt(4) devices.

MFC r225950:

Add descriptor sense support to CAM, and honor sense residuals properly in
CAM.

Desriptor sense is a new sense data format that originated in SPC-3. Among
other things, it allows for an 8-byte info field, which is necessary to
pass back block numbers larger than 4 bytes.

This change adds a number of new functions to scsi_all.c (and therefore
libcam) that abstract out most access to sense data.

This includes a bump of CAM_VERSION, because the CCB ABI has changed.
Userland programs that use the CAM pass(4) driver will need to be
recompiled.

camcontrol.c: Change uses of scsi_extract_sense() to use
scsi_extract_sense_len().

Use scsi_get_sks() instead of accessing sense key specific
data directly.

scsi_modes: Update the control mode page to the latest version (SPC-4).

scsi_cmds.c,
scsi_target.c: Change references to struct scsi_sense_data to struct
scsi_sense_data_fixed. This should be changed to allow the
user to specify fixed or descriptor sense, and then use
scsi_set_sense_data() to build the sense data.

ps3cdrom.c: Use scsi_set_sense_data() instead of setting sense data
manually.

cam_periph.c: Use scsi_extract_sense_len() instead of using
scsi_extract_sense() or accessing sense data directly.

cam_ccb.h: Bump the CAM_VERSION from 0x15 to 0x16. The change of
struct scsi_sense_data from 32 to 252 bytes changes the
size of struct ccb_scsiio, but not the size of union ccb.
So the version must be bumped to prevent structure
mis-matches.

scsi_all.h: Lots of updated SCSI sense data and other structures.

Add function prototypes for the new sense data functions.

Take out the inline implementation of scsi_extract_sense().
It is now too large to put in a header file.

Add macros to calculate whether fields are present and
filled in fixed and descriptor sense data

scsi_all.c: In scsi_op_desc(), allow the user to pass in NULL inquiry
data, and we'll assume a direct access device in that case.

Changed the SCSI RESERVED sense key name and description
to COMPLETED, as it is now defined in the spec.

Change the error recovery action for a number of read errors
to prevent lots of retries when the drive has said that the
block isn't accessible. This speeds up reconstruction of
the block by any RAID software running on top of the drive
(e.g. ZFS).

In scsi_sense_desc(), allow for invalid sense key numbers.
This allows calling this routine without checking the input
values first.

Change scsi_error_action() to use scsi_extract_sense_len(),
and handle things when invalid asc/ascq values are
encountered.

Add a new routine, scsi_desc_iterate(), that will call the
supplied function for every descriptor in descriptor format
sense data.

Add scsi_set_sense_data(), and scsi_set_sense_data_va(),
which build descriptor and fixed format sense data. They
currently default to fixed format sense data.

Add a number of scsi_get_*() functions, which get different
types of sense data fields from either fixed or descriptor
format sense data, if the data is present.

Add a number of scsi_*_sbuf() functions, which print
formatted versions of various sense data fields. These
functions work for either fixed or descriptor sense.

Add a number of scsi_sense_*_sbuf() functions, which have a
standard calling interface and print the indicated field.
These functions take descriptors only.

Add scsi_sense_desc_sbuf(), which will print a formatted
version of the given sense descriptor.

Pull out a majority of the scsi_sense_sbuf() function and
put it into scsi_sense_only_sbuf(). This allows callers
that don't use struct ccb_scsiio to easily utilize the
printing routines. Revamp that function to handle
descriptor sense and use the new sense fetching and
printing routines.

Move scsi_extract_sense() into scsi_all.c, and implement it
in terms of the new function, scsi_extract_sense_len().
The _len() version takes a length (which should be the
sense length - residual) and can indicate which fields are
present and valid in the sense data.

Add a couple of new scsi_get_*() routines to get the sense
key, asc, and ascq only.

mly.c: Rename struct scsi_sense_data to struct
scsi_sense_data_fixed.

sbp_targ.c: Use the new sense fetching routines to get sense data
instead of accessing it directly.

sbp.c: Change the firewire/SCSI sense data transformation code to
use struct scsi_sense_data_fixed instead of struct
scsi_sense_data. This should be changed later to use
scsi_set_sense_data().

ciss.c: Calculate the sense residual properly. Use
scsi_get_sense_key() to fetch the sense key.

mps_sas.c,
mpt_cam.c: Set the sense residual properly.

iir.c: Use scsi_set_sense_data() instead of building sense data by
hand.

iscsi_subr.c: Use scsi_extract_sense_len() instead of grabbing sense data
directly.

umass.c: Use scsi_set_sense_data() to build sense data.

Grab the sense key using scsi_get_sense_key().

Calculate the sense residual properly.

isp_freebsd.h: Use scsi_get_*() routines to grab asc, ascq, and sense key
values.

Calculate and set the sense residual.

Approved by: re (kib)
Sponsored by: Spectra Logic Corporation

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Tell about the full name we opened, not the unit.

Obtained from: Sean Bruno
MFC after: 1 month

A few enhancements I made while working on the Firewire target (sbp_targ).

Update the error handling in a couple of cases to exit gracefully if
certain mandatory conditions aren't met.

Reduce the maximum number of initiators to 8 for this example code. While
1024 is more correct, this example code would act like it was stalled out
even though it was merely allocating the needed structures in init_ccbs()

Reviewed by: scottl@freebsd.org

Bump MAX_INITIATORS to 1024- the LSI-Logic can go even higher than
this for 'initiator id'- this is a stopgap until a sparse map is
added.

Make compat defines for offset format (FreeBSD 5 or less).

Add no-asyncio flag. There's some breakage with ASYNC I/O that every
now and then drops us into an infinite loop. This also then does
a fallback to no-asyncio if the AIO option isn't loaded/compiled into
the kernel.

A number of other chanes to try and track some breakage.

Make scsi_target actually compile after a structure member
change.

Obtained from: Either Scott, Nate, Ken or A. Nagy

- Enable 16byte commands.
- Fix printf warnings on 64bit architectures.
- Accept 'k', 'm' and etc. for -s option.

Reviewed by: njl

* scsi_cmds.c
- Fill in autosense data.
- Add compatibility for RELENG_4.

* scsi_target.c
- Raw device support
- Set correct value in c_descr->offset for CAM_DIR_NONE case.
- Support for CTIO abort.

kernel:
* Fix a bug where devices weren't cleaned up on close(): CAM_REQ_CMP != 0

user:
* Increase timeout in usermode to CAM_TIME_INFINITY. The initiator is in
charge of timeouts and the value was in ms, not seconds.
* Bring two debugging printfs under the debug flag
* Clean up man page to show increased testing on isp(4)

Submitted by: gibbs (bugfixes)

Add check for AIO support before starting up.

New SCSI target emulator code

This code allows a user program to enable target mode on a SIM and
then emulate any number of devices (disks, tape drives, etc.) All
decisions about device behavior (UA, CA, inquiry response) are left
to the usermode program and the kernel driver is merely a conduit
for CCBs. This enables multiple concurrent target emulators, each
using its own backing store and IO model.

Also included is a user program that emulates a disk (RBC) using a
file as a backing store. This provides functionality similar to
md(4) at the CAM layer.

Code has been tested on ahc(4) and should also work on isp(4) (and
other SIMs that gain target mode support). It is a complete rewrite
of /sys/cam/scsi_target* and /usr/share/examples/scsi_target.

Design, comments from: gibbs
Supported by: Cryptography Research
Approved by: re

include paths.h for _PATH_DEV

Add `_PATH_DEVZERO'.
Use _PATH_* where where possible.

Don't get stuck in a loop calling exit from an atexit routine. Clean
up cam_fill_ctio usage to passed atio flags. Clear periph_priv area
of new ctio so if the kernel is dumb enough to look at them (this is
a SECURITY hole) the panic will be obvious instead of subtle.

Clean up after oneself on exit.

Whoops- more changes in last checkin than TARGIODEBUG-
some additional TARGIOCCLEAREXCEPTION ioctls added as
needed.

Obtained from: gibbs@freebsd.org

Make use of the new TARGIODEBUG ioctl (i.e., add an option for it's use).

$Id$ -> $FreeBSD$

Add a cleanup handler called "atexit" to make sure we free up target
mode instances.

Print out exception information passed out from the kernel target mode
driver to this userland daemon.

Allocate a target mode instance to handle our target mode session, clean
it up on exit. The address for attaching the emulator (path, target id,
lun) is now specified on the command line. Some attempt at cathing
signals and cleaning up target mode instances is now made.

Remove debugging printfs.

SCSI Target userland process example. Provides/Dumps the data related to
RECEIVE/SEND processor target requests to the "targ" sample target mode
driver.