This patch adds calls to kill CQ takslets v3 hw during probe failure.
Signed-off-by: NXiang Chen <chenxiang66@hisilicon.com>
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

The channel interrupt is to process all the interrupts except PHY
UP/DOWN and broadcast interrupt. So we need to clear all the interrupts
except those 3 interrupts after processing channel interrupts.
Signed-off-by: NXiang Chen <chenxiang66@hisilicon.com>
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Modify STP link timer from 10ms to 500ms. Also add the register address.
Signed-off-by: NXiang Chen <chenxiang66@hisilicon.com>
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

For v3 hw, internal abort function required status and command buffer to
be set, so add necessary code for this.
Signed-off-by: NXiang Chen <chenxiang66@hisilicon.com>
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Add two ATA commands, ATA_CMD_ZAC_MGMT_IN and ATA_CMD_ZAC_MGMT_OUT in
hisi_sas_get_ata_protocol(), to support SATA SMR disk.
Signed-off-by: NXiaofei Tan <tanxiaofei@huawei.com>
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

This patch is a fix related to freeing a device in v2 hw driver.

Before, we polled to ITCT CLR interrupt to check if a device is free.

This was error prone, as if the interrupt doesn't occur in 10us, we miss
processing it.

To avoid this situation, service this interrupt and sync the event with
a completion.
Signed-off-by: NXiang Chen <chenxiang66@hisilicon.com>
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

This patch adds support to clean-up allocated IRQs and kill tasklets
when probe fails and for driver removal.
Signed-off-by: NXiang Chen <chenxiang66@hisilicon.com>
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

This patch removes some repeated configurations:

(1) The device id of the device is already set in the alloc function, so
    we don't need to modify in free device function.

(2) Field dev_type and dev_status are configured in hisi_sas_dev_gone(),
    so there is no need for repeated config in free_device_v3_hw.
Signed-off-by: NXiang Chen <chenxiang66@hisilicon.com>
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

The code to print ECC errors in v2 hw driver is very repetitive.  This
patch condensed the code by looping an array of errors.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Signed-off-by: NShiju Jose <shiju.jose@huawei.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Add DFX feature for v2 hw. We are adding support for
the following errors:
- loss_of_dword_sync_count
- invalid_dword_count
- phy_reset_problem_count
- running_disparity_error_count
Signed-off-by: NXiaofei Tan <tanxiaofei@huawei.com>
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

The value dw0 is the residual bytes when UNDERFLOW error happens, but we
filled the residual with the value of dw3 before. So change the residual
from dw3 to dw0.
Signed-off-by: NXiang Chen <chenxiang66@hisilicon.com>
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

When some interrupts happen together, we need to process every interrupt
one-by-one, and should not return immediately when one interrupt process
is finished being processed.
Signed-off-by: NXiang Chen <chenxiang66@hisilicon.com>
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

This patch provides fixes for the following issues:

1. Fix issue of controller reset required to send commands. For reset
   process, it may be required to send commands to the controller, but
   not during soft reset.  So add HISI_SAS_NOT_ACCEPT_CMD_BIT to prevent
   executing a task during this period.

2. Send a broadcast event in rescan topology to detect any topology
   changes during reset.

3. Previously it was not ensured that libsas has processed the PHY up
   and down events after reset. Potentially this could cause an issue
   that we still process the PHY event after reset. So resolve this by
   flushing shot workqueue in LLDD reset.

4. Port ID requires refresh after reset. The port ID generated after
   reset is not guaranteed to be the same as before reset, so it needs
   to be refreshed for each device's ITCT.
Signed-off-by: NXiaofei Tan <tanxiaofei@huawei.com>
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Reviewed-by: NScott Benesh <scott.benesh@microsemi.com>
Signed-off-by: NKevin Barnett <kevin.barnett@microsemi.com>
Signed-off-by: NDon Brace <don.brace@microsemi.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Update the driver’s PCI IDs to match the latest Microsemi controllers
Reviewed-by: NScott Benesh <scott.benesh@microsemi.com>
Signed-off-by: NKevin Barnett <kevin.barnett@microsemi.com>
Signed-off-by: NDon Brace <don.brace@microsemi.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Add PQI reset to driver shutdown callback to work around controller bug.

During an 1.) OS shutdown or 2.) kexec outside of a kdump, the Linux
kernel will clear BME on our controller.

If BME is cleared during a controller/host PCIe transfer, the controller
will lock up.

So we perform a PQI reset in the driver's shutdown callback function to
eliminate the possibility of a controller/host PCIe transfer being
active when the kernel clears BME immediately after calling the driver's
shutdown callback.
Reviewed-by: NScott Benesh <scott.benesh@microsemi.com>
Signed-off-by: NKevin Barnett <kevin.barnett@microsemi.com>
Signed-off-by: NDon Brace <don.brace@microsemi.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Reviewed-by: NScott Benesh <scott.benesh@microsemi.com>
Signed-off-by: NKevin Barnett <kevin.barnett@microsemi.com>
Signed-off-by: NDon Brace <don.brace@microsemi.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

 - make pass-thru requests bi-directional
Reviewed-by: NScott Benesh <scott.benesh@microsemi.com>
Signed-off-by: NKevin Barnett <kevin.barnett@microsemi.com>
Signed-off-by: NDon Brace <don.brace@microsemi.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

 - distinguish between shutdown and non-shutdown.
Reviewed-by: NScott Benesh <scott.benesh@microsemi.com>
Signed-off-by: NKevin Barnett <kevin.barnett@microsemi.com>
Signed-off-by: NDon Brace <don.brace@microsemi.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Reviewed-by: NScott Benesh <scott.benesh@microsemi.com>
Signed-off-by: NKevin Barnett <kevin.barnett@microsemi.com>
Signed-off-by: NDon Brace <don.brace@microsemi.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

The null check on pHba->channel[chan].device is redundant because
device is an array and hence can never be null. Remove the check.

Detected by CoverityScan, CID#115362 ("Array compared against 0")
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

The return value of dma_map_single() should be checked by
dma_mapping_error(). However, in function qla26xx_dport_diagnostics(), its
return value is checked against NULL, which could result in failures.
Signed-off-by: NPan Bian <bianpan2016@163.com>
Acked-by: NHimanshu Madhani <himanshu.madhani@cavium.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

The return value of scsi_host_alloc() should be released by
scsi_host_put(). However, in function mvs_pci_init(), kfree()
is used. This patch replaces kfree() with scsi_host_put() to avoid
possible memory leaks.
Signed-off-by: NPan Bian <bianpan2016@163.com>
Reviewed-by: NJack Wang <jinpu.wang@profitbricks.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

In function pm8001_pci_probe(), on errors that the control flow jumps to
label err_out_ha_free, function pm8001_free() is called. In pm8001_free(),
scsi_host_put() is called to release shost, which keeps the return value
of scsi_host_alloc(). After pm8001_free() returns, kfree() is called to
free shost again, resulting in a double free bug. This patch removes
scsi_host_put() from pm8001_free() and explicitly calls scsi_host_put()
to release Scsi_Host in need.
Signed-off-by: NPan Bian <bianpan2016@163.com>
Reviewed-by: NJack Wang <jinpu.wang@profitbricks.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

fix allocate instance->pd_info twice which was introduced by 96188a89.
Signed-off-by: Nweiping zhang <zhangweiping@didichuxing.com>
Acked-by: NSumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

After sending a message, always clear esp->msg_out_len. Otherwise,
eh_abort_handler may subsequently fail to send an ABORT TASK SET
message.
Tested-by: NStan Johnson <userm57@yahoo.com>
Signed-off-by: NFinn Thain <fthain@telegraphics.com.au>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

If an LLD aborts a task set, it should complete the affected commands
with the appropriate result code. In a couple of cases esp_scsi doesn't
do so.

When the initiator receives an unhandled message, just respond by sending
a MESSAGE REJECT instead of ABORT TASK SET, and thus avoid the issue.

OTOH, a MESSAGE REJECT sent by a target can be taken as an indication
that the initiator messed up somehow. It isn't always possible to abort
correctly, so just fall back on a SCSI bus reset, which will complete the
affected commands with the appropriate result code.

For example, certain Apple (Sony) CD-ROM drives, when the non-existent
LUN 1 is scanned, can't handle the INQUIRY command. The problem is not
detected until the initiator gets a MESSAGE REJECT. Whenever esp_scsi
sees that message, it raises ATN and sends ABORT TASK SET -- but
neglects to complete the failed scmd.

The target then goes into DATA OUT phase (probably bogus), while the ESP
device goes into disconnected mode (surprising, given the bus phase).
The next Transfer Information command from esp_scsi then causes
an Invalid Command interrupt because that command is not valid when in
disconnected mode:

mac_esp: using PDMA for controller 0
mac_esp mac_esp.0: esp0: regs[50f10000:(null)] irq[19]
mac_esp mac_esp.0: esp0: is a ESP236, 16 MHz (ccf=4), SCSI ID 7
scsi host0: esp
scsi 0:0:0:0: Direct-Access     SEAGATE  ST318416N        0010 PQ: 0 ANSI: 3
scsi target0:0:0: Beginning Domain Validation
scsi target0:0:0: asynchronous
scsi target0:0:0: Domain Validation skipping write tests
scsi target0:0:0: Ending Domain Validation
scsi 0:0:3:0: CD-ROM            SONY     CD-ROM CDU-8003A 1.9a PQ: 0 ANSI: 2 CCS
scsi target0:0:3: Beginning Domain Validation
scsi target0:0:3: FAST-5 SCSI 2.0 MB/s ST (500 ns, offset 15)
scsi target0:0:3: Domain Validation skipping write tests
scsi target0:0:3: Ending Domain Validation
scsi host0: unexpected IREG 40
scsi host0: Dumping command log
scsi host0: ent[2] CMD val[c2] sreg[90] seqreg[cc] sreg2[00] ireg[20] ss[01] event[0c]
scsi host0: ent[3] CMD val[00] sreg[91] seqreg[04] sreg2[00] ireg[18] ss[00] event[0c]
scsi host0: ent[4] EVENT val[0d] sreg[91] seqreg[04] sreg2[00] ireg[18] ss[00] event[0c]
scsi host0: ent[5] EVENT val[03] sreg[91] seqreg[04] sreg2[00] ireg[18] ss[00] event[0d]
scsi host0: ent[6] CMD val[90] sreg[91] seqreg[04] sreg2[00] ireg[18] ss[00] event[03]
scsi host0: ent[7] EVENT val[05] sreg[91] seqreg[04] sreg2[00] ireg[18] ss[00] event[03]
scsi host0: ent[8] EVENT val[0d] sreg[93] seqreg[cc] sreg2[00] ireg[10] ss[00] event[05]
scsi host0: ent[9] CMD val[01] sreg[93] seqreg[cc] sreg2[00] ireg[10] ss[00] event[0d]
scsi host0: ent[10] CMD val[11] sreg[93] seqreg[cc] sreg2[00] ireg[10] ss[00] event[0d]
scsi host0: ent[11] EVENT val[0b] sreg[93] seqreg[cc] sreg2[00] ireg[10] ss[00] event[0d]
scsi host0: ent[12] CMD val[12] sreg[97] seqreg[cc] sreg2[00] ireg[08] ss[00] event[0b]
scsi host0: ent[13] EVENT val[0c] sreg[97] seqreg[cc] sreg2[00] ireg[08] ss[00] event[0b]
scsi host0: ent[14] CMD val[44] sreg[90] seqreg[cc] sreg2[00] ireg[20] ss[00] event[0c]
scsi host0: ent[15] CMD val[01] sreg[90] seqreg[cc] sreg2[00] ireg[20] ss[01] event[0c]
scsi host0: ent[16] CMD val[c2] sreg[90] seqreg[cc] sreg2[00] ireg[20] ss[01] event[0c]
scsi host0: ent[17] CMD val[00] sreg[87] seqreg[02] sreg2[00] ireg[18] ss[00] event[0c]
scsi host0: ent[18] EVENT val[0d] sreg[87] seqreg[02] sreg2[00] ireg[18] ss[00] event[0c]
scsi host0: ent[19] EVENT val[06] sreg[87] seqreg[02] sreg2[00] ireg[18] ss[00] event[0d]
scsi host0: ent[20] CMD val[01] sreg[87] seqreg[02] sreg2[00] ireg[18] ss[00] event[06]
scsi host0: ent[21] CMD val[10] sreg[87] seqreg[02] sreg2[00] ireg[18] ss[00] event[06]
scsi host0: ent[22] CMD val[1a] sreg[87] seqreg[ca] sreg2[00] ireg[08] ss[00] event[06]
scsi host0: ent[23] CMD val[12] sreg[87] seqreg[ca] sreg2[00] ireg[08] ss[00] event[06]
scsi host0: ent[24] EVENT val[0d] sreg[87] seqreg[ca] sreg2[00] ireg[08] ss[00] event[06]
scsi host0: ent[25] EVENT val[09] sreg[86] seqreg[ca] sreg2[00] ireg[10] ss[00] event[0d]
scsi host0: ent[26] CMD val[01] sreg[86] seqreg[ca] sreg2[00] ireg[10] ss[00] event[09]
scsi host0: ent[27] CMD val[10] sreg[86] seqreg[ca] sreg2[00] ireg[10] ss[00] event[09]
scsi host0: ent[28] EVENT val[0a] sreg[86] seqreg[ca] sreg2[00] ireg[10] ss[00] event[09]
scsi host0: ent[29] EVENT val[0d] sreg[80] seqreg[ca] sreg2[00] ireg[20] ss[00] event[0a]
scsi host0: ent[30] EVENT val[04] sreg[80] seqreg[ca] sreg2[00] ireg[20] ss[00] event[0d]
scsi host0: ent[31] CMD val[01] sreg[80] seqreg[ca] sreg2[00] ireg[20] ss[00] event[04]
scsi host0: ent[0] CMD val[90] sreg[80] seqreg[ca] sreg2[00] ireg[20] ss[00] event[04]
scsi host0: ent[1] EVENT val[05] sreg[80] seqreg[ca] sreg2[00] ireg[20] ss[00] event[04]
scsi target0:0:3: FAST-5 SCSI 2.0 MB/s ST (500 ns, offset 15)
scsi target0:0:0: asynchronous
sr 0:0:3:0: [sr0] scsi-1 drive
cdrom: Uniform CD-ROM driver Revision: 3.20
sd 0:0:0:0: Attached scsi generic sg0 type 0
sr 0:0:3:0: Attached scsi generic sg1 type 5

This patch resolves this issue because the bus reset causes the INQUIRY
command to fail earlier, and return the appropriate result code.
Tested-by: NStan Johnson <userm57@yahoo.com>
Signed-off-by: NFinn Thain <fthain@telegraphics.com.au>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

This patch improves readability. There are no functional changes.

Since this touches on a questionable ESP_INTR_DC conditional, add some
commentary to help others who may (as I did) find themselves chasing an
"Invalid Command" error after the device flags this condition.

This cleanup also eliminates a warning from "make W=1":
drivers/scsi/esp_scsi.c: In function 'esp_finish_select':
drivers/scsi/esp_scsi.c:1233:5: warning: variable 'orig_select_state' set but not used [-Wunused-but-set-variable]
  u8 orig_select_state;
Tested-by: NStan Johnson <userm57@yahoo.com>
Signed-off-by: NFinn Thain <fthain@telegraphics.com.au>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

When in MESSAGE IN phase, the ESP device does not automatically
acknowledge each byte that is transferred by PIO. The mac_esp driver
neglects to explicitly ack them, which causes a timeout during messages
larger than one byte (e.g. tag bytes during reconnect). Fix this with an
ESP_CMD_MOK command after each byte.

The MESSAGE IN phase is also different in that each byte transferred
raises ESP_INTR_FDONE. So don't exit the transfer loop for this interrupt,
for this phase.

That resolves the "Reconnect IRQ2 timeout" error on those Macs which use
PIO transfers instead of PDMA. This patch also improves on the weak tests
for unexpected interrupts and phase changes during PIO transfers.
Tested-by: NStan Johnson <userm57@yahoo.com>
Fixes: 02507a80 ("[PATCH] [SCSI] mac_esp: fix PIO mode, take 2")
Signed-off-by: NFinn Thain <fthain@telegraphics.com.au>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Avoid the following warning from "make C=1":

  CHECK   drivers/scsi/mac_esp.c
drivers/scsi/mac_esp.c:357:30: warning: incorrect type in initializer (different address spaces)
drivers/scsi/mac_esp.c:357:30:    expected unsigned char [usertype] *fifo
drivers/scsi/mac_esp.c:357:30:    got void [noderef] <asn:2>*
Tested-by: NStan Johnson <userm57@yahoo.com>
Signed-off-by: NFinn Thain <fthain@telegraphics.com.au>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Add const to bin_attribute structures as they are only passed to the
functions system_{remove/create}_bin_file. The arguments passed are of
type const, so declare the structures to be const.

Done using Coccinelle.
Signed-off-by: NBhumika Goyal <bhumirks@gmail.com>
Reviewed-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

This patch adds early checks to avoid burning CPU cycles on
the assembly of trace entries which would be skipped anyway.

Introduce a static const variable to keep the trace level to check with
debug_level_enabled() in sync with the actual trace emit with
debug_event(). In order not to refactor the SAN tracing too much,
simply use a define instead.

This change is only for the non / semi hot paths,
while the actual (I/O) hot path was already improved earlier:
zfcp_dbf_scsi() is already guarded by its only caller _zfcp_dbf_scsi()
since commit dcd20e23 ("[SCSI] zfcp: Only collect SCSI debug data for
matching trace levels").
zfcp_dbf_hba_fsf_res() is already guarded by its only caller
zfcp_dbf_hba_fsf_response() since commit 2e261af8 ("[SCSI] zfcp: Only
collect FSF/HBA debug data for matching trace levels").
Signed-off-by: NMartin Peschke <mpeschke@linux.vnet.ibm.com>
[maier@linux.vnet.ibm.com: rebase, reword, default level 3 branch prediction]
Signed-off-by: NSteffen Maier <maier@linux.vnet.ibm.com>
Reviewed-by: NBenjamin Block <bblock@linux.vnet.ibm.com>
Signed-off-by: NBenjamin Block <bblock@linux.vnet.ibm.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Improves commit 43f60cbd ("[SCSI] zfcp: No automatic port_rescan on
events")
Signed-off-by: NMartin Peschke <mpeschke@linux.vnet.ibm.com>
[maier@linux.vnet.ibm.com: reword, underscore in description to match sysfs]
Signed-off-by: NSteffen Maier <maier@linux.vnet.ibm.com>
Reviewed-by: NBenjamin Block <bblock@linux.vnet.ibm.com>
Signed-off-by: NBenjamin Block <bblock@linux.vnet.ibm.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

v2.6.38 commit a54ca0f6 ("[SCSI] zfcp: Redesign of the debug tracing
for HBA records.")
dropped trace information previously introduced with
v2.6.27 commit c3baa9a2 ("[SCSI] zfcp: Add information about interrupt
to trace.")
but kept and needlessly assigned a now no longer used struct field.
Signed-off-by: NMartin Peschke <mpeschke@linux.vnet.ibm.com>
[maier@linux.vnet.ibm.com: reword, added git history]
Signed-off-by: NSteffen Maier <maier@linux.vnet.ibm.com>
Reviewed-by: NBenjamin Block <bblock@linux.vnet.ibm.com>
Signed-off-by: NBenjamin Block <bblock@linux.vnet.ibm.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Commit a54ca0f6 ("[SCSI] zfcp: Redesign of the debug tracing for HBA
records.") refactored zfcp_dbf_hba_berr into zfcp_dbf_hba_bit_err
but added the prototype for the latter without removing it for the former.
Suggested-by: NMartin Peschke <mpeschke@linux.vnet.ibm.com>
Signed-off-by: NSteffen Maier <maier@linux.vnet.ibm.com>
Reviewed-by: NBenjamin Block <bblock@linux.vnet.ibm.com>
Signed-off-by: NBenjamin Block <bblock@linux.vnet.ibm.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Signed-off-by: NMartin Peschke <mpeschke@linux.vnet.ibm.com>
[maier@linux.vnet.ibm.com: re-worded short description for more details]
Signed-off-by: NSteffen Maier <maier@linux.vnet.ibm.com>
Reviewed-by: NBenjamin Block <bblock@linux.vnet.ibm.com>
Signed-off-by: NBenjamin Block <bblock@linux.vnet.ibm.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Improves commit 250a1352 ("[SCSI] zfcp: Redesign of the debug tracing
for SCSI records.")
Signed-off-by: NSteffen Maier <maier@linux.vnet.ibm.com>
Reviewed-by: NBenjamin Block <bblock@linux.vnet.ibm.com>
Signed-off-by: NBenjamin Block <bblock@linux.vnet.ibm.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Just to silence sparse. Since zfcp only exists for s390 and
s390 is big endian, this has been working correctly without conversions
and all the new conversions are NOPs so no performance impact.

Nonetheless, use the conversion on the constant expression where possible.

NB: N_Port-IDs have always been handled with hton24 or ntoh24 conversions
because they also convert to / from character array.

Affected common code structs and .fields are:

HOT I/O PATH:
fcp_cmnd .fc_dl
   FCP command: regular SCSI I/O, including DIX case

SEMI-HOT I/O PATH:
fcp_cmnd .fc_dl
   recovery FCP command: task management function (LUN / target reset)
fcp_resp_ext
   FCP response having FCP_SNS_LEN_VAL with .fr_rsp_len .fr_sns_len
   FCP response having FCP_RESID_UNDER with .fr_resid

RECOVERY / DISCOVERY PATHS:
fc_ct_hdr .ct_cmd .ct_mr_size
   zfcp auto port scan [GPN_FT] with fc_gpn_ft_resp.fp_wwpn,
   recovery for returned port [GID_PN] with fc_ns_gid_pn.fn_wwpn,
   get symbolic port name [GSPN],
   register symbolic port name [RSPN] (NPIV only).
fc_els_rscn .rscn_plen
   incoming ELS (RSCN).
fc_els_flogi .fl_wwpn .fl_wwnn
   incoming ELS (PLOGI),
   port open response with .fl_csp.sp_bb_data .fl_cssp[0..3].cp_class,
   FCP channel physical port,
   point-to-point peer (P2P only).
fc_els_logo .fl_n_port_wwn
   incoming ELS (LOGO).
fc_els_adisc .adisc_wwnn .adisc_wwpn
   path test after RSCN for gone target port.

Since v4.10 commit 05de9700 ("linux/types.h: enable endian checks for
all sparse builds"), below sparse endianness reports appear by default.
Previously, one needed to pass argument CF="-D__CHECK_ENDIAN__" to make
as in: $ make C=1 CF="-D__CHECK_ENDIAN__" M=drivers/s390/scsi.

Silenced sparse warnings and one error:

$ make C=1 M=drivers/s390/scsi
...
  CHECK   drivers/s390/scsi/zfcp_dbf.c
drivers/s390/scsi/zfcp_dbf.c:463:22: warning: restricted __be16 degrades to integer
drivers/s390/scsi/zfcp_dbf.c:476:28: warning: restricted __be16 degrades to integer
  CC      drivers/s390/scsi/zfcp_dbf.o
...
  CHECK   drivers/s390/scsi/zfcp_fc.c
drivers/s390/scsi/zfcp_fc.c:263:26: warning: restricted __be16 degrades to integer
drivers/s390/scsi/zfcp_fc.c:299:41: warning: incorrect type in argument 2 (different base types)
drivers/s390/scsi/zfcp_fc.c:299:41:    expected unsigned long long [unsigned] [usertype] wwpn
drivers/s390/scsi/zfcp_fc.c:299:41:    got restricted __be64 [usertype] fl_wwpn
drivers/s390/scsi/zfcp_fc.c:309:40: warning: incorrect type in argument 2 (different base types)
drivers/s390/scsi/zfcp_fc.c:309:40:    expected unsigned long long [unsigned] [usertype] wwpn
drivers/s390/scsi/zfcp_fc.c:309:40:    got restricted __be64 [usertype] fl_n_port_wwn
drivers/s390/scsi/zfcp_fc.c:338:31: warning: restricted __be16 degrades to integer
drivers/s390/scsi/zfcp_fc.c:355:24: warning: incorrect type in assignment (different base types)
drivers/s390/scsi/zfcp_fc.c:355:24:    expected restricted __be16 [usertype] ct_cmd
drivers/s390/scsi/zfcp_fc.c:355:24:    got unsigned short [unsigned] [usertype] cmd
drivers/s390/scsi/zfcp_fc.c:356:28: warning: incorrect type in assignment (different base types)
drivers/s390/scsi/zfcp_fc.c:356:28:    expected restricted __be16 [usertype] ct_mr_size
drivers/s390/scsi/zfcp_fc.c:356:28:    got int
drivers/s390/scsi/zfcp_fc.c:379:36: warning: incorrect type in assignment (different base types)
drivers/s390/scsi/zfcp_fc.c:379:36:    expected restricted __be64 [usertype] fn_wwpn
drivers/s390/scsi/zfcp_fc.c:379:36:    got unsigned long long [unsigned] [usertype] wwpn
drivers/s390/scsi/zfcp_fc.c:463:18: warning: restricted __be64 degrades to integer
drivers/s390/scsi/zfcp_fc.c:465:17: warning: cast from restricted __be64
drivers/s390/scsi/zfcp_fc.c:473:20: warning: incorrect type in assignment (different base types)
drivers/s390/scsi/zfcp_fc.c:473:20:    expected unsigned long long [unsigned] [usertype] wwnn
drivers/s390/scsi/zfcp_fc.c:473:20:    got restricted __be64 [usertype] fl_wwnn
drivers/s390/scsi/zfcp_fc.c:474:29: warning: incorrect type in assignment (different base types)
drivers/s390/scsi/zfcp_fc.c:474:29:    expected unsigned int [unsigned] [usertype] maxframe_size
drivers/s390/scsi/zfcp_fc.c:474:29:    got restricted __be16 [usertype] sp_bb_data
drivers/s390/scsi/zfcp_fc.c:476:30: warning: restricted __be16 degrades to integer
drivers/s390/scsi/zfcp_fc.c:478:30: warning: restricted __be16 degrades to integer
drivers/s390/scsi/zfcp_fc.c:480:30: warning: restricted __be16 degrades to integer
drivers/s390/scsi/zfcp_fc.c:482:30: warning: restricted __be16 degrades to integer
drivers/s390/scsi/zfcp_fc.c:500:28: warning: incorrect type in assignment (different base types)
drivers/s390/scsi/zfcp_fc.c:500:28:    expected unsigned long long [unsigned] [usertype] wwnn
drivers/s390/scsi/zfcp_fc.c:500:28:    got restricted __be64 [usertype] adisc_wwnn
drivers/s390/scsi/zfcp_fc.c:502:38: warning: restricted __be64 degrades to integer
drivers/s390/scsi/zfcp_fc.c:541:40: warning: incorrect type in assignment (different base types)
drivers/s390/scsi/zfcp_fc.c:541:40:    expected restricted __be64 [usertype] adisc_wwpn
drivers/s390/scsi/zfcp_fc.c:541:40:    got unsigned long long [unsigned] [usertype] port_name
drivers/s390/scsi/zfcp_fc.c:542:40: warning: incorrect type in assignment (different base types)
drivers/s390/scsi/zfcp_fc.c:542:40:    expected restricted __be64 [usertype] adisc_wwnn
drivers/s390/scsi/zfcp_fc.c:542:40:    got unsigned long long [unsigned] [usertype] node_name
drivers/s390/scsi/zfcp_fc.c:669:16: warning: restricted __be16 degrades to integer
drivers/s390/scsi/zfcp_fc.c:696:24: warning: restricted __be64 degrades to integer
drivers/s390/scsi/zfcp_fc.c:699:54: warning: incorrect type in argument 2 (different base types)
drivers/s390/scsi/zfcp_fc.c:699:54:    expected unsigned long long [unsigned] [usertype] <noident>
drivers/s390/scsi/zfcp_fc.c:699:54:    got restricted __be64 [usertype] fp_wwpn
  CC      drivers/s390/scsi/zfcp_fc.o
  CHECK   drivers/s390/scsi/zfcp_fsf.c
drivers/s390/scsi/zfcp_fsf.c:479:34: warning: incorrect type in assignment (different base types)
drivers/s390/scsi/zfcp_fsf.c:479:34:    expected unsigned long long [unsigned] [usertype] port_name
drivers/s390/scsi/zfcp_fsf.c:479:34:    got restricted __be64 [usertype] fl_wwpn
drivers/s390/scsi/zfcp_fsf.c:480:34: warning: incorrect type in assignment (different base types)
drivers/s390/scsi/zfcp_fsf.c:480:34:    expected unsigned long long [unsigned] [usertype] node_name
drivers/s390/scsi/zfcp_fsf.c:480:34:    got restricted __be64 [usertype] fl_wwnn
drivers/s390/scsi/zfcp_fsf.c:506:36: warning: incorrect type in assignment (different base types)
drivers/s390/scsi/zfcp_fsf.c:506:36:    expected unsigned long long [unsigned] [usertype] peer_wwpn
drivers/s390/scsi/zfcp_fsf.c:506:36:    got restricted __be64 [usertype] fl_wwpn
drivers/s390/scsi/zfcp_fsf.c:507:36: warning: incorrect type in assignment (different base types)
drivers/s390/scsi/zfcp_fsf.c:507:36:    expected unsigned long long [unsigned] [usertype] peer_wwnn
drivers/s390/scsi/zfcp_fsf.c:507:36:    got restricted __be64 [usertype] fl_wwnn
drivers/s390/scsi/zfcp_fc.h:269:46: warning: restricted __be32 degrades to integer
drivers/s390/scsi/zfcp_fc.h:270:29: error: incompatible types in comparison expression (different base types)
Signed-off-by: NSteffen Maier <maier@linux.vnet.ibm.com>
Reviewed-by: NBenjamin Block <bblock@linux.vnet.ibm.com>
Signed-off-by: NBenjamin Block <bblock@linux.vnet.ibm.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

This eases crash dump analysis by automatically dissecting these
protocol headers at least somewhat rather than getting a string
interpretation of large unstructured character array buffer fields.

Also, we can get rid of some unnecessary and error-prone type casts.

This change is possible since v2.6.33 commit 4318e08c
("[SCSI] zfcp: Update FCP protocol related code").
Signed-off-by: NSteffen Maier <maier@linux.vnet.ibm.com>
Reviewed-by: NBenjamin Block <bblock@linux.vnet.ibm.com>
Signed-off-by: NBenjamin Block <bblock@linux.vnet.ibm.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Signed-off-by: NSteffen Maier <maier@linux.vnet.ibm.com>
Reviewed-by: NBenjamin Block <bblock@linux.vnet.ibm.com>
Signed-off-by: NBenjamin Block <bblock@linux.vnet.ibm.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>