Use spinlocks with finer granularity in the submission and
completion paths to allow concurrent execution for multiple
reply queues.  In particular, do not hold a spin lock while
submitting a request to the device, nor during most of the
interrupt handler.
Signed-off-by: NMatt Gates <matthew.gates@hp.com>
Signed-off-by: NStephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

Smart Arrays can support multiple reply queues onto which command
completions may be deposited.  It can help performance quite a bit
to arrange for command completions to be processed on the same CPU
from which they were submitted to increase the likelihood of cache
hits.
Signed-off-by: NMatt Gates <matthew.gates@hp.com>
Signed-off-by: NStephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

This is in order to smooth the way for upcoming changes to allow use of
multiple reply queues for command completions.
Signed-off-by: NStephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: NMatt Gates <matthew.gates@hp.com>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

When aborting a command, the tag is supposed to be
specified as 64-bit little endian.  However, some smart
arrays expect the tag of the command to be aborted to be
specified in a strange byte order.  How to tell which sort
of Smart Array firmware we're dealing with is not obvious.
However, because of the way we construct our tags, the values
of any outstanding tag when specified with the "strange" byte
order will not collide with the value specified in the correct
order.  That means we can safely attempt the abort both ways.
Signed-off-by: NStephen M. Cameron <stephenmcameron@gmail.com>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

Signed-off-by: NStephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

Signed-off-by: NStephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

Instead of giving up after 3 immediate retries of driver initiated
commands, back off the rate of retries and retry a bunch more times.
Signed-off-by: NStephen M. Cameron <scameron@beardog.cce.hp.com>
Reviewed-by: Andi Shyti <andi.shyti@gmail.com> 
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

In shared SAS configurations we might get a busy status
during driver initiated commands (e.g. during rescan for
devices).  We should retry the command in such cases rather
than giving up.
Signed-off-by: NMatt Bondurant <Matthew.dav.bondurant@hp.com>
Signed-off-by: NStephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

MSI/MSI-X interrupts can't race the DMA completion they are communicating
so no need to read from controller to flush the DMA to the host if
MSI or MSI-X interrupts are being used.
Signed-off-by: NStephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

Default behavior for any CHECK CONDITION excepting a few special cases is to
print out certain parts of the sense buffer and the CDB.  Default behavior
should be to print nothing and let the upper layers or applications decide what
to do about these.  The same information is already available by setting the
appropriate bits of the scsi_logging_level kernel parameter or via
/proc/sys/dev/scsi/logging_level.
Signed-off-by: NStephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

pci_disable_device() disables the bus master bit and pci_enable_device does
not re-enable it.  It needs to be enabled.
Signed-off-by: NStephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

There was code to skip "disabled" devices which was intended to
skip devices disabled in the BIOS, but it really just checks to
see if the device can write to host memory, which this is disabled
by pci_disable_device on driver unload, so this check has the effect
of preventing subsequent load of the driver.  And devices disabled in
the BIOS don't show up at all anyway, so this check never made any
sense to begin with, and should be removed.
Signed-off-by: NStephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

As Jenx Axboe explained to me: "In earlier times (2.6.18 and pre, iirc), Linux
disabled IO and mem bars on pci_disable_device(). Now in newer kernel it does
not. And in the newer kernels you run into problems if you DON'T disable the
device on exit, since when it later loads the device is already in the enabled
state - and pci_enable_device() then does nothing. This typically screws
MSI/MSI-X." This is what the big scary comment that says pci_disable_device
does "something nasty" to smart arrays was evidently referring to.

If pci_disable_device is not called on driver rmmod, subsequently insmod'ing
the driver may in result in some cases fail to be able to receive interrupts,
esp.  if other drivers are loaded between unloading and loading hpsa.
Signed-off-by: NStephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

Check the domain validation flag on the given device before referencing
scsi_device instance, otherwise if the flag is already set we return without
decrementing the reference count.
Signed-off-by: NMike Maslenkin <mihailm@parallels.com>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

Old version: 2.7.0.3
New version: 2.7.2.2
Signed-off-by: NEddie Wai <eddie.wai@broadcom.com>
Reviewed-by: NMike Christie <michaelc@cs.wisc.edu>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

This will set the target can_queue limit to the number of preallocated
session tasks set during creation.

"Could not send nopout" messages were observed without this when the
iSCSI connection experiences dropped frames under heavy I/O stress.
Signed-off-by: NEddie Wai <eddie.wai@broadcom.com>
Reviewed-by: NMike Christie <michaelc@cs.wisc.edu>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

This is a followup to a patch provided by Jack Wang on September 21 2011.

After increasing the CAN_QUEUE to 510 in pm8001 we discovered some performance
degredation from time to time. We needed to increase the MPI queue to
compensate and ensure we never hit that limit. We also needed to double
the margin to support event and administrivial commands that take from
the pool resulting in an occasional largely unproductive command completion
with soft error to the caller when the command pool is overloaded temporarily.
Signed-off-by: NMark Salyzyn <mark_salyzyn@xyratex.com>
Acked-by: NJack Wang <jack_wang@usish.com>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

UTP Transfer request list base registers UTRLBA and UTRLBAU
must be assigned, lower-32 and upper-32 bits of UTRLD list
physical base addresses respectively.

Currently UTRLBAU is being assigned lower-32 bits of UTRLD
physical base address. This will cause an issue with
controllers that can support 64-bit addressing.

This patch correctly assigns upper-32 bits of UTRLD physical
base address to UTRLBAU.
Reported-by: NRene De Jong <rene.dejong@arm.com>
Signed-off-by: NSantosh Yaraganavi <santoshsy@gmail.com>
Reviewed-by: NVinayak Holikatti <vinholikatti@gmail.com>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

We moved the locking in dd060e74 "[SCSI] fcoe: remove frame dropping
code from fcoe_percpu_clean" but this unlock was missed.
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NRobert Love <robert.w.love@intel.com>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

FC-BB-6 v1.04 7.9.8.14 N_Port_ID Beacon:

"A N_Port_ID Beacon is multicast and uses the VN_Port MAC address as source
address."

Currently, libfcoe is using ENode MAC, this seems ok and functionality wise
not a problem in my back to back testing setup, however, just fix this to
make libfcoe VN2VN support more spec compliant.
Signed-off-by: NYi Zou <yi.zou@intel.com>
Signed-off-by: NRobert Love <robert.w.love@intel.com>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

The rtnl_mutex was held to protect calls to dev_uc_add
and dev_uc_del. Holding rtnl is not required as those
functions make use of the netif_addr_lock* API to
protect the MAC changing.

This change fixes the following regression by removing
the rtnl usage when fcoe_update_src_mac is called.

https://bugzilla.kernel.org/show_bug.cgi?id=42918

the existing dependency chain (in reverse order) is:

-> #1 (&fip->ctlr_mutex){+.+...}:
       [<c1091f70>] lock_acquire+0x80/0x1b0
       [<c147655d>] mutex_lock_nested+0x6d/0x340
       [<f8970c32>] fcoe_ctlr_link_up+0x22/0x180 [libfcoe]
       [<f894620e>] fcoe_create+0x47e/0x6e0 [fcoe]
       [<f8973dd3>] fcoe_transport_create+0x143/0x250 [libfcoe]
       [<c10527e0>] param_attr_store+0x30/0x60
       [<c1052696>] module_attr_store+0x26/0x40
       [<c11a201e>] sysfs_write_file+0xae/0x100
       [<c11449df>] vfs_write+0x8f/0x160
       [<c1144cbd>] sys_write+0x3d/0x70
       [<c147a0c4>] syscall_call+0x7/0xb

-> #0 (rtnl_mutex){+.+.+.}:
       [<c109164b>] __lock_acquire+0x140b/0x1720
       [<c1091f70>] lock_acquire+0x80/0x1b0
       [<c147655d>] mutex_lock_nested+0x6d/0x340
       [<c13a10c4>] rtnl_lock+0x14/0x20
       [<f89445ac>] fcoe_update_src_mac+0x2c/0xb0 [fcoe]
       [<f8971712>] fcoe_ctlr_timer_work+0x712/0xb60 [libfcoe]
       [<c104fb69>] process_one_work+0x179/0x5d0
       [<c10502f1>] worker_thread+0x121/0x2d0
       [<c10550ed>] kthread+0x7d/0x90
       [<c1481a82>] kernel_thread_helper+0x6/0x10

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&fip->ctlr_mutex);
                               lock(rtnl_mutex);
                               lock(&fip->ctlr_mutex);
  lock(rtnl_mutex);

 *** DEADLOCK ***
Signed-off-by: NRobert Love <robert.w.love@intel.com>
Tested-by: NBart Van Assche <bvanassche@acm.org>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

The fcoe controller has back references, therefore defer
releasing master lport which gets freed along scsi_host_put
and then free it once fcoe interface is fully cleaned.
Signed-off-by: NVasu Dev <vasu.dev@intel.com>
Acked-by: NNeil Horman <nhorman@tuxdriver.com>
Tested-by: NRoss Brattain <ross.b.brattain@intel.com>
Signed-off-by: NRobert Love <robert.w.love@intel.com>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

The lport could get timeout armed while its getting disabled,
so flush lport worker after its disabled and ignore lport
retry in that case instead of WARN_ON.

 [13192.936858] WARNING: at drivers/scsi/libfc/fc_lport.c:1573 fc_lport_timeout+0x53/0xa9 [libfc]()
 [13192.938026] Hardware name: Bochs
 [13192.938620] Modules linked in: fcoe libfcoe libfc scsi_transport_fc scsi_tgt fuse 8021q garp stp llc sunrpc ipv6 uinput microcode joydev pcspkr ixgbe e1000 i2c_piix4 i2c_core virtio_balloon dca mdio virtio_blk virtio_pci virtio_ring virtio floppy [last unloaded: speedstep_lib]
 [13192.942589] Pid: 23605, comm: kworker/0:6 Tainted: G        W    3.2.0+ #71
 [13192.943587] Call Trace:
 [13192.944052]  [<ffffffff810403f4>] warn_slowpath_common+0x85/0x9d
 [13192.944940]  [<ffffffff81040426>] warn_slowpath_null+0x1a/0x1c
 [13192.945734]  [<ffffffffa02746eb>] fc_lport_timeout+0x53/0xa9 [libfc]
 [13192.946665]  [<ffffffff81058d88>] process_one_work+0x20c/0x3ad
 [13192.947541]  [<ffffffff81058cbe>] ? process_one_work+0x142/0x3ad
 [13192.948423]  [<ffffffffa0274698>] ? fc_lport_enter_ns+0x178/0x178 [libfc]
 [13192.949363]  [<ffffffff8105a313>] worker_thread+0xfd/0x181
 [13192.950191]  [<ffffffff8105a216>] ? manage_workers.clone.15+0x173/0x173
 [13192.951100]  [<ffffffff8105e19b>] kthread+0xa4/0xac
 [13192.951755]  [<ffffffff814edbb4>] kernel_thread_helper+0x4/0x10
 [13192.952520]  [<ffffffff814e5cb4>] ? retint_restore_args+0x13/0x13
 [13192.953398]  [<ffffffff8105e0f7>] ? __init_kthread_worker+0x5b/0x5b
 [13192.954278]  [<ffffffff814edbb0>] ? gs_change+0x13/0x13
 [13192.954911] ---[ end trace 9763213b95bbd803 ]---
Signed-off-by: NVasu Dev <vasu.dev@intel.com>
Acked-by: NNeil Horman <nhorman@tuxdriver.com>
Tested-by: NRoss Brattain <ross.b.brattain@intel.com>
Signed-off-by: NRobert Love <robert.w.love@intel.com>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

Remove lport from net device and then do synchronize net device to flush
inflight rx frames for the lport before doing fcoe_percpu_clean.

In case of master lport, remove all rx packet handlers completely and
then only do fcoe_percpu_clean. This required splitting fcoe_interface_cleanup
to do remove part separately and for that added func fcoe_interface_remove
and then  call it from fcoe_if_destory before doing fcoe_percpu_clean.
However if fcoe_interface_remove() is already called then
don't call again from fcoe_interface_cleanup() to preserve its
existing flows.

This patch along with Neil's other patch to avoid soft irq context
on ingress will avoid passing up frames on disabled lport as
discussed in this mail thread:-
http://lists.open-fcoe.org/pipermail/devel/2012-February/011947.htmlSigned-off-by: NVasu Dev <vasu.dev@intel.com>
Acked-by: NNeil Horman <nhorman@tuxdriver.com>
Tested-by: NRoss Brattain <ross.b.brattain@intel.com>
Signed-off-by: NRobert Love <robert.w.love@intel.com>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

Add myself and Santosh Y as maintainers for drivers/scsi/ufs/
Signed-off-by: NVinayak Holikatti <vinholikatti@gmail.com>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

While interpreting the result of UTP task completion status,
by using boolean &&, the evaluation would fail when the
UPIU_TASK_MANAGEMENT_FUNC_SUCCEEDED was received.

Either UPIU_TASK_MANAGEMENT_FUNC_COMPL or
UPIU_TASK_MANAGEMENT_FUNC_SUCCEEDED should be
considered as a success result.
Reported-by: NJoe Perches <joe@perches.com>
Signed-off-by: NVenkatraman S <svenkatr@ti.com>
Reviewed-by: NNamjae Jeon <linkinjeon@gmail.com>
Acked-by: NSantosh Y <santoshsy@gmail.com>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

When scsi_add_host fails the scsi_host_put should be called.
Signed-off-by: NTomas Henzl <thenzl@redhat.com>
Acked-by: N"Nandigama, Nagalakshmi" <Nagalakshmi.Nandigama@lsi.com>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

When a rport is added back or the role is changed the fc class
will queue a scan and then call scsi_target_unblock. The problem
with this is if the devices are in the SDEV_OFFLINE state and
the scan is run before the scsi_target_unblock, then the scan
will see LUN0 as offline and the scan will fail. This patch moves
the unblock call to before the scan, so we know the device state
will be set correctly when the scan is run.
Signed-off-by: NMike Christie <michaelc@cs.wisc.edu>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

There is a memory leak in the st driver when sending large enough reads or
writes using st's direct I/O path.  As part of mapping the application's
memory, a buffer to hold page pointers is allocated and the count of mapped
pages is stored in field do_dio.  A non-zero do_dio marks that direct I/O is
in use.

But do_dio is only 1 byte in size.  Mapping 256 4k pages overflows
do_dio and causes it to be set to 0, like direct I/O option was not
used.  When the I/O completes, the buffer to hold the page pointers is
not freed, and the page counts of the mapped pages are not reduced.
Every I/O of this size then leaks memory.

The size of do_dio needs to be increased to prevent it wrapping around.
Signed-off-by: NDavid Jeffery <djeffery@redhat.com>
Acked-by: NKai Mäkisara <kai.makisara@kolumbus.fi>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

Signed-off-by: NKrishna Gudipati <kgudipat@brocade.com>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

Made changes to have the same logging level for Logical port
online and offline events, to display these events in pairs.
Signed-off-by: NKrishna Gudipati <kgudipat@brocade.com>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

Make changes to remove unsupported model numbers from the sysfs
model description routine.
Signed-off-by: NKrishna Gudipati <kgudipat@brocade.com>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

Made changes to avoid queuing the vport delete work to IM driver
work queue in the bfa_fcb_lport_delete() - since at this stage we
are not completely done with using the vport structure as we are
still waiting for the LOGO response from the fw in online state or
just doing some cleanup. Since queuing up the vport delete work at
this stage will result in the FC transport layer to clean up the vport
before we get the response from firmware.
Made changes to queue the port delete work to the IM driver work queue -
from the bfa_fcs_vport_free() function since at this state we are done
with using the vport data structure and the FCS state machine is completely
cleaned up.
Signed-off-by: NKrishna Gudipati <kgudipat@brocade.com>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

Hyper-V cannot process some commands like ATA_12 and ATA_16. It also returns a
very generic error when this happens (SRB_STATUS_ERROR).  Most of the time we
treat SRB_STATUS_ERROR as DID_TARGET_FAILURE which causes error handler retry,
but in the case of pass through commands, they'll never succeed (and the error
handler will offline the device), so put a discriminating block in the command
completion routing and send the SRB_STATUS_ERROR upwards with DID_PASSTHROUGH
for commands we know should not be retried.
Signed-off-by: NK. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: NHaiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

Implement ISCSI_HOST_PARAM_PORT_STATE and ISCSI_HOST_PARAM_PORT_SPEED
to get the Adapter port state and port name
Signed-off-by: NJohn Soni Jose <sony.john-n@emulex.com>
Signed-off-by: NJayamohan Kallickal <jayamohan.kallickal@emulex.com>
Signed-off-by: NMike Christie <michaelc@cs.wisc.edu>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

This patch allows iscsiadm to set/ delete static IP and enable /disable
DHCP.
Signed-off-by: NMike Christie <michaelc@cs.wisc.edu>
Signed-off-by: NJayamohan Kallickal <jayamohan.kallickal@emulex.com>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

Signed-off-by: NJayamohan Kallickal <jayamohan.kallickal@emulex.com>
Signed-off-by: NMike Christie <michaelc@cs.wisc.edu>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

Implement the ISCSI_HOST_PARAM_INITIATOR_NAME for .get_host_param
Signed-off-by: NJohn Soni Jose <sony.john-n@emulex.com>
Signed-off-by: NJayamohan Kallickal <jayamohan.kallickal@emulex.com>
Signed-off-by: NMike Christie <michaelc@cs.wisc.edu>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

The async handle corresponding to unknown Opcode was not freed
earlier. This code does the fix for that.
Signed-off-by: NJohn Soni Jose <sony.john-n@emulex.com>
Signed-off-by: NJayamohan Kallickal <jayamohan.kallickal@emulex.com>
Signed-off-by: NMike Christie <michaelc@cs.wisc.edu>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

For each ASYNC PDU received there is an HDR and DATA handle for it.
There will be only 1 HDR ASYNC Handle, but DATA Handle can be more
than 1 for each ASYNC PDU received. Checking if the ASYNC Handle
correspongs to HDR or DATA while returning the Handle to the free list.
hwi_free_async_msg just return the handles to the free list. No return
values are needed so changing the return type to void.
Signed-off-by: NJohn Soni Jose <sony.john-n@emulex.com>
Signed-off-by: NJayamohan Kallickal <jayamohan.kallickal@emulex.com>
Signed-off-by: NMike Christie <michaelc@cs.wisc.edu>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>