1. 11 Aug, 2017 4 commits
  2. 10 Aug, 2017 36 commits
    • Kevin Barnett's avatar
    • Kevin Barnett's avatar
      scsi: smartpqi: add in new controller ids · 55790064
      Kevin Barnett authored
      Update the driver’s PCI IDs to match the latest Microsemi controllers
      Reviewed-by: default avatarScott Benesh <scott.benesh@microsemi.com>
      Signed-off-by: default avatarKevin Barnett <kevin.barnett@microsemi.com>
      Signed-off-by: default avatarDon Brace <don.brace@microsemi.com>
      Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
      55790064
    • Kevin Barnett's avatar
      scsi: smartpqi: update kexec and power down support · b6d47811
      Kevin Barnett authored
      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: default avatarScott Benesh <scott.benesh@microsemi.com>
      Signed-off-by: default avatarKevin Barnett <kevin.barnett@microsemi.com>
      Signed-off-by: default avatarDon Brace <don.brace@microsemi.com>
      Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
      b6d47811
    • Kevin Barnett's avatar
    • Kevin Barnett's avatar
      scsi: smartpqi: update pqi passthru ioctl · 41555d54
      Kevin Barnett authored
       - make pass-thru requests bi-directional
      Reviewed-by: default avatarScott Benesh <scott.benesh@microsemi.com>
      Signed-off-by: default avatarKevin Barnett <kevin.barnett@microsemi.com>
      Signed-off-by: default avatarDon Brace <don.brace@microsemi.com>
      Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
      41555d54
    • Kevin Barnett's avatar
      scsi: smartpqi: enhance BMIC cache flush · 58322fe0
      Kevin Barnett authored
       - distinguish between shutdown and non-shutdown.
      Reviewed-by: default avatarScott Benesh <scott.benesh@microsemi.com>
      Signed-off-by: default avatarKevin Barnett <kevin.barnett@microsemi.com>
      Signed-off-by: default avatarDon Brace <don.brace@microsemi.com>
      Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
      58322fe0
    • Kevin Barnett's avatar
    • Colin Ian King's avatar
      scsi: dpt_i2o: remove redundant null check on array device · 0b7250f9
      Colin Ian King authored
      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: default avatarColin Ian King <colin.king@canonical.com>
      Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
      0b7250f9
    • Pan Bian's avatar
      scsi: qla2xxx: use dma_mapping_error to check map errors · 0b2ce198
      Pan Bian authored
      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: default avatarPan Bian <bianpan2016@163.com>
      Acked-by: default avatarHimanshu Madhani <himanshu.madhani@cavium.com>
      Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
      0b2ce198
    • Pan Bian's avatar
      scsi: mvsas: replace kfree with scsi_host_put · cf99dc30
      Pan Bian authored
      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: default avatarPan Bian <bianpan2016@163.com>
      Reviewed-by: default avatarJack Wang <jinpu.wang@profitbricks.com>
      Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
      cf99dc30
    • Pan Bian's avatar
      scsi: pm8001: fix double free in pm8001_pci_probe · bc1371c1
      Pan Bian authored
      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: default avatarPan Bian <bianpan2016@163.com>
      Reviewed-by: default avatarJack Wang <jinpu.wang@profitbricks.com>
      Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
      bc1371c1
    • weiping's avatar
      scsi: megaraid_sas: fix allocate instance->pd_info twice · 3b8328e2
      weiping authored
      fix allocate instance->pd_info twice which was introduced by 96188a89.
      Signed-off-by: default avatarweiping zhang <zhangweiping@didichuxing.com>
      Acked-by: default avatarSumit Saxena <sumit.saxena@broadcom.com>
      Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
      3b8328e2
    • Finn Thain's avatar
      scsi: esp_scsi: Always clear msg_out_len after MESSAGE OUT phase · d60e9eec
      Finn Thain authored
      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: default avatarStan Johnson <userm57@yahoo.com>
      Signed-off-by: default avatarFinn Thain <fthain@telegraphics.com.au>
      Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
      d60e9eec
    • Finn Thain's avatar
      scsi: esp_scsi: Avoid sending ABORT TASK SET messages · c69edff5
      Finn Thain authored
      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: default avatarStan Johnson <userm57@yahoo.com>
      Signed-off-by: default avatarFinn Thain <fthain@telegraphics.com.au>
      Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
      c69edff5
    • Finn Thain's avatar
      scsi: esp_scsi: Clean up control flow and dead code · 201c37d7
      Finn Thain authored
      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: default avatarStan Johnson <userm57@yahoo.com>
      Signed-off-by: default avatarFinn Thain <fthain@telegraphics.com.au>
      Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
      201c37d7
    • Finn Thain's avatar
      scsi: mac_esp: Fix PIO transfers for MESSAGE IN phase · 7640d91d
      Finn Thain authored
      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: default avatarStan Johnson <userm57@yahoo.com>
      Fixes: 02507a80 ("[PATCH] [SCSI] mac_esp: fix PIO mode, take 2")
      Signed-off-by: default avatarFinn Thain <fthain@telegraphics.com.au>
      Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
      7640d91d
    • Finn Thain's avatar
      scsi: mac_esp: Avoid type warning from sparse · b36c7db9
      Finn Thain authored
      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: default avatarStan Johnson <userm57@yahoo.com>
      Signed-off-by: default avatarFinn Thain <fthain@telegraphics.com.au>
      Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
      b36c7db9
    • Bhumika Goyal's avatar
      arcmsr: add const to bin_attribute structures · 5f3342d7
      Bhumika Goyal authored
      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: default avatarBhumika Goyal <bhumirks@gmail.com>
      Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
      Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
      5f3342d7
    • Martin Peschke's avatar
      scsi: zfcp: early returns for traces disabled via level · f32c9e03
      Martin Peschke authored
      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: default avatarMartin Peschke <mpeschke@linux.vnet.ibm.com>
      [maier@linux.vnet.ibm.com: rebase, reword, default level 3 branch prediction]
      Signed-off-by: default avatarSteffen Maier <maier@linux.vnet.ibm.com>
      Reviewed-by: default avatarBenjamin Block <bblock@linux.vnet.ibm.com>
      Signed-off-by: default avatarBenjamin Block <bblock@linux.vnet.ibm.com>
      Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
      f32c9e03
    • Martin Peschke's avatar
      scsi: zfcp: clean up unnecessary module_param_named() with no_auto_port_rescan · b096ef86
      Martin Peschke authored
      Improves commit 43f60cbd ("[SCSI] zfcp: No automatic port_rescan on
      events")
      Signed-off-by: default avatarMartin Peschke <mpeschke@linux.vnet.ibm.com>
      [maier@linux.vnet.ibm.com: reword, underscore in description to match sysfs]
      Signed-off-by: default avatarSteffen Maier <maier@linux.vnet.ibm.com>
      Reviewed-by: default avatarBenjamin Block <bblock@linux.vnet.ibm.com>
      Signed-off-by: default avatarBenjamin Block <bblock@linux.vnet.ibm.com>
      Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
      b096ef86
    • Martin Peschke's avatar
      scsi: zfcp: clean up a member of struct zfcp_qdio that was assigned but never used · 5ec21960
      Martin Peschke authored
      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: default avatarMartin Peschke <mpeschke@linux.vnet.ibm.com>
      [maier@linux.vnet.ibm.com: reword, added git history]
      Signed-off-by: default avatarSteffen Maier <maier@linux.vnet.ibm.com>
      Reviewed-by: default avatarBenjamin Block <bblock@linux.vnet.ibm.com>
      Signed-off-by: default avatarBenjamin Block <bblock@linux.vnet.ibm.com>
      Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
      5ec21960
    • Steffen Maier's avatar
      scsi: zfcp: clean up no longer existent prototype from zfcp API header · 46e5ee1f
      Steffen Maier authored
      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: default avatarMartin Peschke <mpeschke@linux.vnet.ibm.com>
      Signed-off-by: default avatarSteffen Maier <maier@linux.vnet.ibm.com>
      Reviewed-by: default avatarBenjamin Block <bblock@linux.vnet.ibm.com>
      Signed-off-by: default avatarBenjamin Block <bblock@linux.vnet.ibm.com>
      Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
      46e5ee1f
    • Martin Peschke's avatar
      scsi: zfcp: clean up redundant code with fall through in link down SRB switch case · 5f03e98b
      Martin Peschke authored
      Signed-off-by: default avatarMartin Peschke <mpeschke@linux.vnet.ibm.com>
      [maier@linux.vnet.ibm.com: re-worded short description for more details]
      Signed-off-by: default avatarSteffen Maier <maier@linux.vnet.ibm.com>
      Reviewed-by: default avatarBenjamin Block <bblock@linux.vnet.ibm.com>
      Signed-off-by: default avatarBenjamin Block <bblock@linux.vnet.ibm.com>
      Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
      5f03e98b
    • Steffen Maier's avatar
      scsi: zfcp: fix kernel doc comment typos for struct zfcp_dbf_scsi · 5b2fc2a1
      Steffen Maier authored
      Improves commit 250a1352 ("[SCSI] zfcp: Redesign of the debug tracing
      for SCSI records.")
      Signed-off-by: default avatarSteffen Maier <maier@linux.vnet.ibm.com>
      Reviewed-by: default avatarBenjamin Block <bblock@linux.vnet.ibm.com>
      Signed-off-by: default avatarBenjamin Block <bblock@linux.vnet.ibm.com>
      Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
      5b2fc2a1
    • Steffen Maier's avatar
      scsi: zfcp: use endianness conversions with common FC(P) struct fields · 9d464fc1
      Steffen Maier authored
      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: default avatarSteffen Maier <maier@linux.vnet.ibm.com>
      Reviewed-by: default avatarBenjamin Block <bblock@linux.vnet.ibm.com>
      Signed-off-by: default avatarBenjamin Block <bblock@linux.vnet.ibm.com>
      Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
      9d464fc1
    • Steffen Maier's avatar
      scsi: zfcp: use common code fcp_cmnd and fcp_resp with union in fsf_qtcb_bottom_io · df00d7b8
      Steffen Maier authored
      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: default avatarSteffen Maier <maier@linux.vnet.ibm.com>
      Reviewed-by: default avatarBenjamin Block <bblock@linux.vnet.ibm.com>
      Signed-off-by: default avatarBenjamin Block <bblock@linux.vnet.ibm.com>
      Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
      df00d7b8
    • Steffen Maier's avatar
    • Steffen Maier's avatar
      scsi: zfcp: more fitting constant for fc_ct_hdr.ct_reason on port scan response · ab8ab4be
      Steffen Maier authored
      v2.6.33 commit dbf5dfe9 ("[SCSI] zfcp: Use common code definitions for
      FC CT structs") replaced own definitions with common code definitions.
      While FC_BA_RJT_UNABLE happens to be defined with the same value 9 as
      FC_FS_RJT_UNABL and thus also works, here we should use the latter from
      fc_gs.h.
      See also its use in libfc's fc_disc_gpn_ft_resp().
      Signed-off-by: default avatarSteffen Maier <maier@linux.vnet.ibm.com>
      Reviewed-by: default avatarBenjamin Block <bblock@linux.vnet.ibm.com>
      Signed-off-by: default avatarBenjamin Block <bblock@linux.vnet.ibm.com>
      Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
      ab8ab4be
    • Steffen Maier's avatar
      scsi: zfcp: trace high part of "new" 64 bit SCSI LUN · 5d4a3d0a
      Steffen Maier authored
      Complements debugging aspects of the otherwise functionally complete
      v3.17 commit 9cb78c16 ("scsi: use 64-bit LUNs").
      
      While I don't have access to a target exporting 3 or 4 level LUNs,
      I did test it by explicitly attaching a non-existent fake 4 level LUN
      by means of zfcp sysfs attribute "unit_add".
      In order to see corresponding trace records of otherwise successful
      events, we had to increase the trace level of area SCSI and HBA to 6.
      
      $ echo 6 > /sys/kernel/debug/s390dbf/zfcp_0.0.1880_scsi/level
      $ echo 6 > /sys/kernel/debug/s390dbf/zfcp_0.0.1880_hba/level
      
      $ echo 0x4011402240334044 > \
        /sys/bus/ccw/drivers/zfcp/0.0.1880/0x50050763031bd327/unit_add
      
      Example output formatted by an updated zfcpdbf from the s390-tools
      package interspersed with kernel messages at scsi_logging_level=4605:
      
      Timestamp      : ...
      Area           : REC
      Subarea        : 00
      Level          : 1
      Exception      : -
      CPU ID         : ..
      Caller         : 0x...
      Record ID      : 1
      Tag            : scsla_1
      LUN            : 0x4011402240334044
      WWPN           : 0x50050763031bd327
      D_ID           : 0x00......
      Adapter status : 0x5400050b
      Port status    : 0x54000001
      LUN status     : 0x41000000
      Ready count    : 0x00000001
      Running count  : 0x00000000
      ERP want       : 0x01
      ERP need       : 0x01
      
      scsi 2:0:0:4630896905707208721: scsi scan: INQUIRY pass 1 length 36
      scsi 2:0:0:4630896905707208721: scsi scan: INQUIRY successful with code 0x0
      
      Timestamp      : ...
      Area           : HBA
      Subarea        : 00
      Level          : 6
      Exception      : -
      CPU ID         : ..
      Caller         : 0x...
      Record ID      : 1
      Tag            : fs_norm
      Request ID     : 0x<inquiry2-req-id>
      Request status : 0x00000010
      FSF cmnd       : 0x00000001
      FSF sequence no: 0x...
      FSF issued     : ...
      FSF stat       : 0x00000000
      FSF stat qual  : 00000000 00000000 00000000 00000000
      Prot stat      : 0x00000001
      Prot stat qual : ........ ........ 00000000 00000000
      Port handle    : 0x...
      LUN handle     : 0x...
      |
      Timestamp      : ...
      Area           : SCSI
      Subarea        : 00
      Level          : 6
      Exception      : -
      CPU ID         : ..
      Caller         : 0x...
      Record ID      : 1
      Tag            : rsl_nor
      Request ID     : 0x<inquiry2-req-id>
      SCSI ID        : 0x00000000
      SCSI LUN       : 0x40224011
      SCSI LUN high  : 0x40444033 <=======================
      SCSI result    : 0x00000000
      SCSI retries   : 0x00
      SCSI allowed   : 0x03
      SCSI scribble  : 0x<inquiry2-req-id>
      SCSI opcode    : 12000000 a4000000 00000000 00000000
      FCP rsp inf cod: 0x00
      FCP rsp IU     : 00000000 00000000 00000000 00000000
                       00000000 00000000
      
      scsi 2:0:0:4630896905707208721: scsi scan: INQUIRY pass 2 length 164
      scsi 2:0:0:4630896905707208721: scsi scan: INQUIRY successful with code 0x0
      scsi 2:0:0:4630896905707208721: scsi scan: peripheral device type of 31, \
      no device added
      Signed-off-by: default avatarSteffen Maier <maier@linux.vnet.ibm.com>
      Fixes: 9cb78c16 ("scsi: use 64-bit LUNs")
      Cc: <stable@vger.kernel.org> #3.17+
      Reviewed-by: default avatarBenjamin Block <bblock@linux.vnet.ibm.com>
      Reviewed-by: default avatarJens Remus <jremus@linux.vnet.ibm.com>
      Signed-off-by: default avatarBenjamin Block <bblock@linux.vnet.ibm.com>
      Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
      5d4a3d0a
    • Steffen Maier's avatar
      scsi: zfcp: trace HBA FSF response by default on dismiss or timedout late response · fdb7cee3
      Steffen Maier authored
      At the default trace level, we only trace unsuccessful events including
      FSF responses.
      
      zfcp_dbf_hba_fsf_response() only used protocol status and FSF status to
      decide on an unsuccessful response. However, this is only one of multiple
      possible sources determining a failed struct zfcp_fsf_req.
      
      An FSF request can also "fail" if its response runs into an ERP timeout
      or if it gets dismissed because a higher level recovery was triggered
      [trace tags "erscf_1" or "erscf_2" in zfcp_erp_strategy_check_fsfreq()].
      FSF requests with ERP timeout are:
      FSF_QTCB_EXCHANGE_CONFIG_DATA, FSF_QTCB_EXCHANGE_PORT_DATA,
      FSF_QTCB_OPEN_PORT_WITH_DID or FSF_QTCB_CLOSE_PORT or
      FSF_QTCB_CLOSE_PHYSICAL_PORT for target ports,
      FSF_QTCB_OPEN_LUN, FSF_QTCB_CLOSE_LUN.
      One example is slow queue processing which can cause follow-on errors,
      e.g. FSF_PORT_ALREADY_OPEN after FSF_QTCB_OPEN_PORT_WITH_DID timed out.
      In order to see the root cause, we need to see late responses even if the
      channel presented them successfully with FSF_PROT_GOOD and FSF_GOOD.
      Example trace records formatted with zfcpdbf from the s390-tools package:
      
      Timestamp      : ...
      Area           : REC
      Subarea        : 00
      Level          : 1
      Exception      : -
      CPU ID         : ..
      Caller         : ...
      Record ID      : 1
      Tag            : fcegpf1
      LUN            : 0xffffffffffffffff
      WWPN           : 0x<WWPN>
      D_ID           : 0x00<D_ID>
      Adapter status : 0x5400050b
      Port status    : 0x41200000
      LUN status     : 0x00000000
      Ready count    : 0x00000001
      Running count  : 0x...
      ERP want       : 0x02				ZFCP_ERP_ACTION_REOPEN_PORT
      ERP need       : 0x02				ZFCP_ERP_ACTION_REOPEN_PORT
      |
      Timestamp      : ...				30 seconds later
      Area           : REC
      Subarea        : 00
      Level          : 1
      Exception      : -
      CPU ID         : ..
      Caller         : ...
      Record ID      : 2
      Tag            : erscf_2
      LUN            : 0xffffffffffffffff
      WWPN           : 0x<WWPN>
      D_ID           : 0x00<D_ID>
      Adapter status : 0x5400050b
      Port status    : 0x41200000
      LUN status     : 0x00000000
      Request ID     : 0x<request_ID>
      ERP status     : 0x10000000			ZFCP_STATUS_ERP_TIMEDOUT
      ERP step       : 0x0800				ZFCP_ERP_STEP_PORT_OPENING
      ERP action     : 0x02				ZFCP_ERP_ACTION_REOPEN_PORT
      ERP count      : 0x00
      |
      Timestamp      : ...				later than previous record
      Area           : HBA
      Subarea        : 00
      Level          : 5	> default level		=> 3	<= default level
      Exception      : -
      CPU ID         : 00
      Caller         : ...
      Record ID      : 1
      Tag            : fs_qtcb			=> fs_rerr
      Request ID     : 0x<request_ID>
      Request status : 0x00001010			ZFCP_STATUS_FSFREQ_DISMISSED
      						| ZFCP_STATUS_FSFREQ_CLEANUP
      FSF cmnd       : 0x00000005
      FSF sequence no: 0x...
      FSF issued     : ...				> 30 seconds ago
      FSF stat       : 0x00000000			FSF_GOOD
      FSF stat qual  : 00000000 00000000 00000000 00000000
      Prot stat      : 0x00000001			FSF_PROT_GOOD
      Prot stat qual : 00000000 00000000 00000000 00000000
      Port handle    : 0x...
      LUN handle     : 0x00000000
      QTCB log length: ...
      QTCB log info  : ...
      
      In case of problems detecting that new responses are waiting on the input
      queue, we sooner or later trigger adapter recovery due to an FSF request
      timeout (trace tag "fsrth_1").
      FSF requests with FSF request timeout are:
      typically FSF_QTCB_ABORT_FCP_CMND; but theoretically also
      FSF_QTCB_EXCHANGE_CONFIG_DATA or FSF_QTCB_EXCHANGE_PORT_DATA via sysfs,
      FSF_QTCB_OPEN_PORT_WITH_DID or FSF_QTCB_CLOSE_PORT for WKA ports,
      FSF_QTCB_FCP_CMND for task management function (LUN / target reset).
      One or more pending requests can meanwhile have FSF_PROT_GOOD and FSF_GOOD
      because the channel filled in the response via DMA into the request's QTCB.
      
      In a theroretical case, inject code can create an erroneous FSF request
      on purpose. If data router is enabled, it uses deferred error reporting.
      A READ SCSI command can succeed with FSF_PROT_GOOD, FSF_GOOD, and
      SAM_STAT_GOOD. But on writing the read data to host memory via DMA,
      it can still fail, e.g. if an intentionally wrong scatter list does not
      provide enough space. Rather than getting an unsuccessful response,
      we get a QDIO activate check which in turn triggers adapter recovery.
      One or more pending requests can meanwhile have FSF_PROT_GOOD and FSF_GOOD
      because the channel filled in the response via DMA into the request's QTCB.
      Example trace records formatted with zfcpdbf from the s390-tools package:
      
      Timestamp      : ...
      Area           : HBA
      Subarea        : 00
      Level          : 6	> default level		=> 3	<= default level
      Exception      : -
      CPU ID         : ..
      Caller         : ...
      Record ID      : 1
      Tag            : fs_norm			=> fs_rerr
      Request ID     : 0x<request_ID2>
      Request status : 0x00001010			ZFCP_STATUS_FSFREQ_DISMISSED
      						| ZFCP_STATUS_FSFREQ_CLEANUP
      FSF cmnd       : 0x00000001
      FSF sequence no: 0x...
      FSF issued     : ...
      FSF stat       : 0x00000000			FSF_GOOD
      FSF stat qual  : 00000000 00000000 00000000 00000000
      Prot stat      : 0x00000001			FSF_PROT_GOOD
      Prot stat qual : ........ ........ 00000000 00000000
      Port handle    : 0x...
      LUN handle     : 0x...
      |
      Timestamp      : ...
      Area           : SCSI
      Subarea        : 00
      Level          : 3
      Exception      : -
      CPU ID         : ..
      Caller         : ...
      Record ID      : 1
      Tag            : rsl_err
      Request ID     : 0x<request_ID2>
      SCSI ID        : 0x...
      SCSI LUN       : 0x...
      SCSI result    : 0x000e0000			DID_TRANSPORT_DISRUPTED
      SCSI retries   : 0x00
      SCSI allowed   : 0x05
      SCSI scribble  : 0x<request_ID2>
      SCSI opcode    : 28...				Read(10)
      FCP rsp inf cod: 0x00
      FCP rsp IU     : 00000000 00000000 00000000 00000000
                                               ^^	SAM_STAT_GOOD
                       00000000 00000000
      
      Only with luck in both above cases, we could see a follow-on trace record
      of an unsuccesful event following a successful but late FSF response with
      FSF_PROT_GOOD and FSF_GOOD. Typically this was the case for I/O requests
      resulting in a SCSI trace record "rsl_err" with DID_TRANSPORT_DISRUPTED
      [On ZFCP_STATUS_FSFREQ_DISMISSED, zfcp_fsf_protstatus_eval() sets
      ZFCP_STATUS_FSFREQ_ERROR seen by the request handler functions as failure].
      However, the reason for this follow-on trace was invisible because the
      corresponding HBA trace record was missing at the default trace level
      (by default hidden records with tags "fs_norm", "fs_qtcb", or "fs_open").
      
      On adapter recovery, after we had shut down the QDIO queues, we perform
      unsuccessful pseudo completions with flag ZFCP_STATUS_FSFREQ_DISMISSED
      for each pending FSF request in zfcp_fsf_req_dismiss_all().
      In order to find the root cause, we need to see all pseudo responses even
      if the channel presented them successfully with FSF_PROT_GOOD and FSF_GOOD.
      
      Therefore, check zfcp_fsf_req.status for ZFCP_STATUS_FSFREQ_DISMISSED
      or ZFCP_STATUS_FSFREQ_ERROR and trace with a new tag "fs_rerr".
      
      It does not matter that there are numerous places which set
      ZFCP_STATUS_FSFREQ_ERROR after the location where we trace an FSF response
      early. These cases are based on protocol status != FSF_PROT_GOOD or
      == FSF_PROT_FSF_STATUS_PRESENTED and are thus already traced by default
      as trace tag "fs_perr" or "fs_ferr" respectively.
      
      NB: The trace record with tag "fssrh_1" for status read buffers on dismiss
      all remains. zfcp_fsf_req_complete() handles this and returns early.
      All other FSF request types are handled separately and as described above.
      Signed-off-by: default avatarSteffen Maier <maier@linux.vnet.ibm.com>
      Fixes: 8a36e453 ("[SCSI] zfcp: enhancement of zfcp debug features")
      Fixes: 2e261af8 ("[SCSI] zfcp: Only collect FSF/HBA debug data for matching trace levels")
      Cc: <stable@vger.kernel.org> #2.6.38+
      Reviewed-by: default avatarBenjamin Block <bblock@linux.vnet.ibm.com>
      Signed-off-by: default avatarBenjamin Block <bblock@linux.vnet.ibm.com>
      Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
      fdb7cee3
    • Steffen Maier's avatar
      scsi: zfcp: fix payload with full FCP_RSP IU in SCSI trace records · 12c3e575
      Steffen Maier authored
      If the FCP_RSP UI has optional parts (FCP_SNS_INFO or FCP_RSP_INFO) and
      thus does not fit into the fsp_rsp field built into a SCSI trace record,
      trace the full FCP_RSP UI with all optional parts as payload record
      instead of just FCP_SNS_INFO as payload and
      a 1 byte RSP_INFO_CODE part of FCP_RSP_INFO built into the SCSI record.
      
      That way we would also get the full FCP_SNS_INFO in case a
      target would ever send more than
      min(SCSI_SENSE_BUFFERSIZE==96, ZFCP_DBF_PAY_MAX_REC==256)==96.
      
      The mandatory part of FCP_RSP IU is only 24 bytes.
      PAYload costs at least one full PAY record of 256 bytes anyway.
      We cap to the hardware response size which is only FSF_FCP_RSP_SIZE==128.
      So we can just put the whole FCP_RSP IU with any optional parts into
      PAYload similarly as we do for SAN PAY since v4.9 commit aceeffbb
      ("zfcp: trace full payload of all SAN records (req,resp,iels)").
      This does not cause any additional trace records wasting memory.
      
      Decoded trace records were confusing because they showed a hard-coded
      sense data length of 96 even if the FCP_RSP_IU field FCP_SNS_LEN showed
      actually less.
      
      Since the same commit, we set pl_len for SAN traces to the full length of a
      request/response even if we cap the corresponding trace.
      In contrast, here for SCSI traces we set pl_len to the pre-computed
      length of FCP_RSP IU considering SNS_LEN or RSP_LEN if valid.
      Nonetheless we trace a hardcoded payload of length FSF_FCP_RSP_SIZE==128
      if there were optional parts.
      This makes it easier for the zfcpdbf tool to format only the relevant
      part of the long FCP_RSP UI buffer. And any trailing information is still
      available in the payload trace record just in case.
      
      Rename the payload record tag from "fcp_sns" to "fcp_riu" to make the new
      content explicit to zfcpdbf which can then pick a suitable field name such
      as "FCP rsp IU all:" instead of "Sense info :"
      Also, the same zfcpdbf can still be backwards compatible with "fcp_sns".
      
      Old example trace record before this fix, formatted with the tool zfcpdbf
      from s390-tools:
      
      Timestamp      : ...
      Area           : SCSI
      Subarea        : 00
      Level          : 3
      Exception      : -
      CPU id         : ..
      Caller         : 0x...
      Record id      : 1
      Tag            : rsl_err
      Request id     : 0x<request_id>
      SCSI ID        : 0x...
      SCSI LUN       : 0x...
      SCSI result    : 0x00000002
      SCSI retries   : 0x00
      SCSI allowed   : 0x05
      SCSI scribble  : 0x<request_id>
      SCSI opcode    : 00000000 00000000 00000000 00000000
      FCP rsp inf cod: 0x00
      FCP rsp IU     : 00000000 00000000 00000202 00000000
                                             ^^==FCP_SNS_LEN_VALID
                       00000020 00000000
                       ^^^^^^^^==FCP_SNS_LEN==32
      Sense len      : 96 <==min(SCSI_SENSE_BUFFERSIZE,ZFCP_DBF_PAY_MAX_REC)
      Sense info     : 70000600 00000018 00000000 29000000
                       00000400 00000000 00000000 00000000
                       00000000 00000000 00000000 00000000<==superfluous
                       00000000 00000000 00000000 00000000<==superfluous
                       00000000 00000000 00000000 00000000<==superfluous
                       00000000 00000000 00000000 00000000<==superfluous
      
      New example trace records with this fix:
      
      Timestamp      : ...
      Area           : SCSI
      Subarea        : 00
      Level          : 3
      Exception      : -
      CPU ID         : ..
      Caller         : 0x...
      Record ID      : 1
      Tag            : rsl_err
      Request ID     : 0x<request_id>
      SCSI ID        : 0x...
      SCSI LUN       : 0x...
      SCSI result    : 0x00000002
      SCSI retries   : 0x00
      SCSI allowed   : 0x03
      SCSI scribble  : 0x<request_id>
      SCSI opcode    : a30c0112 00000000 02000000 00000000
      FCP rsp inf cod: 0x00
      FCP rsp IU     : 00000000 00000000 00000a02 00000200
                       00000020 00000000
      FCP rsp IU len : 56
      FCP rsp IU all : 00000000 00000000 00000a02 00000200
                                             ^^=FCP_RESID_UNDER|FCP_SNS_LEN_VALID
                       00000020 00000000 70000500 00000018
                       ^^^^^^^^==FCP_SNS_LEN
                                         ^^^^^^^^^^^^^^^^^
                       00000000 240000cb 00011100 00000000
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                       00000000 00000000
                       ^^^^^^^^^^^^^^^^^==FCP_SNS_INFO
      
      Timestamp      : ...
      Area           : SCSI
      Subarea        : 00
      Level          : 1
      Exception      : -
      CPU ID         : ..
      Caller         : 0x...
      Record ID      : 1
      Tag            : lr_okay
      Request ID     : 0x<request_id>
      SCSI ID        : 0x...
      SCSI LUN       : 0x...
      SCSI result    : 0x00000000
      SCSI retries   : 0x00
      SCSI allowed   : 0x05
      SCSI scribble  : 0x<request_id>
      SCSI opcode    : <CDB of unrelated SCSI command passed to eh handler>
      FCP rsp inf cod: 0x00
      FCP rsp IU     : 00000000 00000000 00000100 00000000
                       00000000 00000008
      FCP rsp IU len : 32
      FCP rsp IU all : 00000000 00000000 00000100 00000000
                                             ^^==FCP_RSP_LEN_VALID
                       00000000 00000008 00000000 00000000
                                ^^^^^^^^==FCP_RSP_LEN
                                         ^^^^^^^^^^^^^^^^^==FCP_RSP_INFO
      Signed-off-by: default avatarSteffen Maier <maier@linux.vnet.ibm.com>
      Fixes: 250a1352 ("[SCSI] zfcp: Redesign of the debug tracing for SCSI records.")
      Cc: <stable@vger.kernel.org> #2.6.38+
      Reviewed-by: default avatarBenjamin Block <bblock@linux.vnet.ibm.com>
      Signed-off-by: default avatarBenjamin Block <bblock@linux.vnet.ibm.com>
      Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
      12c3e575
    • Steffen Maier's avatar
      scsi: zfcp: fix missing trace records for early returns in TMF eh handlers · 1a5d999e
      Steffen Maier authored
      For problem determination we need to see that we were in scsi_eh
      as well as whether and why we were successful or not.
      
      The following commits introduced new early returns without adding
      a trace record:
      
      v2.6.35 commit a1dbfddd
      ("[SCSI] zfcp: Pass return code from fc_block_scsi_eh to scsi eh")
      on fc_block_scsi_eh() returning != 0 which is FAST_IO_FAIL,
      
      v2.6.30 commit 63caf367
      ("[SCSI] zfcp: Improve reliability of SCSI eh handlers in zfcp")
      on not having gotten an FSF request after the maximum number of retry
      attempts and thus could not issue a TMF and has to return FAILED.
      Signed-off-by: default avatarSteffen Maier <maier@linux.vnet.ibm.com>
      Fixes: a1dbfddd ("[SCSI] zfcp: Pass return code from fc_block_scsi_eh to scsi eh")
      Fixes: 63caf367 ("[SCSI] zfcp: Improve reliability of SCSI eh handlers in zfcp")
      Cc: <stable@vger.kernel.org> #2.6.38+
      Reviewed-by: default avatarBenjamin Block <bblock@linux.vnet.ibm.com>
      Signed-off-by: default avatarBenjamin Block <bblock@linux.vnet.ibm.com>
      Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
      1a5d999e
    • Steffen Maier's avatar
      scsi: zfcp: fix passing fsf_req to SCSI trace on TMF to correlate with HBA · 9fe5d2b2
      Steffen Maier authored
      Without this fix we get SCSI trace records on task management functions
      which cannot be correlated to HBA trace records because all fields
      related to the FSF request are empty (zero).
      Also, the FCP_RSP_IU is missing as well as any sense data if available.
      
      This was caused by v2.6.14 commit 8a36e453 ("[SCSI] zfcp: enhancement
      of zfcp debug features") introducing trace records for TMFs but
      hard coding NULL for a possibly existing TMF FSF request.
      The scsi_cmnd scribble is also zero or unrelated for the TMF request
      so it also could not lookup a suitable FSF request from there.
      
      A broken example trace record formatted with zfcpdbf from the s390-tools
      package:
      
      Timestamp      : ...
      Area           : SCSI
      Subarea        : 00
      Level          : 1
      Exception      : -
      CPU ID         : ..
      Caller         : 0x...
      Record ID      : 1
      Tag            : lr_fail
      Request ID     : 0x0000000000000000
                         ^^^^^^^^^^^^^^^^ no correlation to HBA record
      SCSI ID        : 0x<scsitarget>
      SCSI LUN       : 0x<scsilun>
      SCSI result    : 0x000e0000
      SCSI retries   : 0x00
      SCSI allowed   : 0x05
      SCSI scribble  : 0x0000000000000000
      SCSI opcode    : 2a000017 3bb80000 08000000 00000000
      FCP rsp inf cod: 0x00
                         ^^ no TMF response
      FCP rsp IU     : 00000000 00000000 00000000 00000000
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                       00000000 00000000
                       ^^^^^^^^^^^^^^^^^ no interesting FCP_RSP_IU
      Sense len      : ...
      ^^^^^^^^^^^^^^^^^^^^ no sense data length
      Sense info     : ...
      ^^^^^^^^^^^^^^^^^^^^ no sense data content, even if present
      
      There are some true cases where we really do not have an FSF request:
      "rsl_fai" from zfcp_dbf_scsi_fail_send() called for early
      returns / completions in zfcp_scsi_queuecommand(),
      "abrt_or", "abrt_bl", "abrt_ru", "abrt_ar" from
      zfcp_scsi_eh_abort_handler() where we did not get as far,
      "lr_nres", "tr_nres" from zfcp_task_mgmt_function() where we're
      successful and do not need to do anything because adapter stopped.
      For these cases it's correct to pass NULL for fsf_req to _zfcp_dbf_scsi().
      Signed-off-by: default avatarSteffen Maier <maier@linux.vnet.ibm.com>
      Fixes: 8a36e453 ("[SCSI] zfcp: enhancement of zfcp debug features")
      Cc: <stable@vger.kernel.org> #2.6.38+
      Reviewed-by: default avatarBenjamin Block <bblock@linux.vnet.ibm.com>
      Signed-off-by: default avatarBenjamin Block <bblock@linux.vnet.ibm.com>
      Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
      9fe5d2b2
    • Steffen Maier's avatar
      scsi: zfcp: fix capping of unsuccessful GPN_FT SAN response trace records · 975171b4
      Steffen Maier authored
      v4.9 commit aceeffbb ("zfcp: trace full payload of all SAN records
      (req,resp,iels)") fixed trace data loss of 2.6.38 commit 2c55b750
      ("[SCSI] zfcp: Redesign of the debug tracing for SAN records.")
      necessary for problem determination, e.g. to see the
      currently active zone set during automatic port scan.
      
      While it already saves space by not dumping any empty residual entries
      of the large successful GPN_FT response (4 pages), there are seldom cases
      where the GPN_FT response is unsuccessful and likely does not have
      FC_NS_FID_LAST set in fp_flags so we did not cap the trace record.
      We typically see such case for an initiator WWPN, which is not in any zone.
      
      Cap unsuccessful responses to at least the actual basic CT_IU response
      plus whatever fits the SAN trace record built-in "payload" buffer
      just in case there's trailing information
      of which we would at least see the existence and its beginning.
      
      In order not to erroneously cap successful responses, we need to swap
      calling the trace function and setting the CT / ELS status to success (0).
      
      Example trace record pair formatted with zfcpdbf:
      
      Timestamp      : ...
      Area           : SAN
      Subarea        : 00
      Level          : 1
      Exception      : -
      CPU ID         : ..
      Caller         : 0x...
      Record ID      : 1
      Tag            : fssct_1
      Request ID     : 0x<request_id>
      Destination ID : 0x00fffffc
      SAN req short  : 01000000 fc020000 01720ffc 00000000
                       00000008
      SAN req length : 20
      |
      Timestamp      : ...
      Area           : SAN
      Subarea        : 00
      Level          : 1
      Exception      : -
      CPU ID         : ..
      Caller         : 0x...
      Record ID      : 2
      Tag            : fsscth2
      Request ID     : 0x<request_id>
      Destination ID : 0x00fffffc
      SAN resp short : 01000000 fc020000 80010000 00090700
                       00000000 00000000 00000000 00000000 [trailing info]
                       00000000 00000000 00000000 00000000 [trailing info]
      SAN resp length: 16384
      San resp info  : 01000000 fc020000 80010000 00090700
                       00000000 00000000 00000000 00000000 [trailing info]
                       00000000 00000000 00000000 00000000 [trailing info]
                       00000000 00000000 00000000 00000000 [trailing info]
                       00000000 00000000 00000000 00000000 [trailing info]
                       00000000 00000000 00000000 00000000 [trailing info]
                       00000000 00000000 00000000 00000000 [trailing info]
                       00000000 00000000 00000000 00000000 [trailing info]
                       00000000 00000000 00000000 00000000 [trailing info]
                       00000000 00000000 00000000 00000000 [trailing info]
                       00000000 00000000 00000000 00000000 [trailing info]
                       00000000 00000000 00000000 00000000 [trailing info]
                       00000000 00000000 00000000 00000000 [trailing info]
                       00000000 00000000 00000000 00000000 [trailing info]
                       00000000 00000000 00000000 00000000 [trailing info]
                       00000000 00000000 00000000 00000000 [trailing info]
      
      The fix saves all but one of the previously associated 64 PAYload trace
      record chunks of size 256 bytes each.
      Signed-off-by: default avatarSteffen Maier <maier@linux.vnet.ibm.com>
      Fixes: aceeffbb ("zfcp: trace full payload of all SAN records (req,resp,iels)")
      Fixes: 2c55b750 ("[SCSI] zfcp: Redesign of the debug tracing for SAN records.")
      Cc: <stable@vger.kernel.org> #2.6.38+
      Reviewed-by: default avatarBenjamin Block <bblock@linux.vnet.ibm.com>
      Signed-off-by: default avatarBenjamin Block <bblock@linux.vnet.ibm.com>
      Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
      975171b4
    • Benjamin Block's avatar
      scsi: zfcp: add handling for FCP_RESID_OVER to the fcp ingress path · a099b7b1
      Benjamin Block authored
      Up until now zfcp would just ignore the FCP_RESID_OVER flag in the FCP
      response IU. When this flag is set, it is possible, in regards to the
      FCP standard, that the storage-server processes the command normally, up
      to the point where data is missing and simply ignores those.
      
      In this case no CHECK CONDITION would be set, and because we ignored the
      FCP_RESID_OVER flag we resulted in at least a data loss or even
      -corruption as a follow-up error, depending on how the
      applications/layers on top behave. To prevent this, we now set the
      host-byte of the corresponding scsi_cmnd to DID_ERROR.
      
      Other storage-behaviors, where the same condition results in a CHECK
      CONDITION set in the answer, don't need to be changed as they are
      handled in the mid-layer already.
      
      Following is an example trace record decoded with zfcpdbf from the
      s390-tools package. We forcefully injected a fc_dl which is one byte too
      small:
      
      Timestamp      : ...
      Area           : SCSI
      Subarea        : 00
      Level          : 3
      Exception      : -
      CPU ID         : ..
      Caller         : 0x...
      Record ID      : 1
      Tag            : rsl_err
      Request ID     : 0x...
      SCSI ID        : 0x...
      SCSI LUN       : 0x...
      SCSI result    : 0x00070000
                           ^^DID_ERROR
      SCSI retries   : 0x..
      SCSI allowed   : 0x..
      SCSI scribble  : 0x...
      SCSI opcode    : 2a000000 00000000 08000000 00000000
      FCP rsp inf cod: 0x00
      FCP rsp IU     : 00000000 00000000 00000400 00000001
                                             ^^fr_flags==FCP_RESID_OVER
                                               ^^fr_status==SAM_STAT_GOOD
                                                  ^^^^^^^^fr_resid
                       00000000 00000000
      
      As of now, we don't actively handle to possibility that a response IU
      has both flags - FCP_RESID_OVER and FCP_RESID_UNDER - set at once.
      Reported-by: default avatarLuke M. Hopkins <lmhopkin@us.ibm.com>
      Reviewed-by: default avatarSteffen Maier <maier@linux.vnet.ibm.com>
      Fixes: 553448f6 ("[SCSI] zfcp: Message cleanup")
      Fixes: ea127f97 ("[PATCH] s390 (7/7): zfcp host adapter.") (tglx/history.git)
      Cc: <stable@vger.kernel.org> #2.6.33+
      Signed-off-by: default avatarBenjamin Block <bblock@linux.vnet.ibm.com>
      Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
      a099b7b1
    • Steffen Maier's avatar
      scsi: zfcp: fix queuecommand for scsi_eh commands when DIX enabled · 71b8e45d
      Steffen Maier authored
      Since commit db007fc5 ("[SCSI] Command protection operation"),
      scsi_eh_prep_cmnd() saves scmd->prot_op and temporarily resets it to
      SCSI_PROT_NORMAL.
      Other FCP LLDDs such as qla2xxx and lpfc shield their queuecommand()
      to only access any of scsi_prot_sg...() if
      (scsi_get_prot_op(cmd) != SCSI_PROT_NORMAL).
      
      Do the same thing for zfcp, which introduced DIX support with
      commit ef3eb71d ("[SCSI] zfcp: Introduce experimental support for
      DIF/DIX").
      
      Otherwise, TUR SCSI commands as part of scsi_eh likely fail in zfcp,
      because the regular SCSI command with DIX protection data, that scsi_eh
      re-uses in scsi_send_eh_cmnd(), of course still has
      (scsi_prot_sg_count() != 0) and so zfcp sends down bogus requests to the
      FCP channel hardware.
      
      This causes scsi_eh_test_devices() to have (finish_cmds == 0)
      [not SCSI device is online or not scsi_eh_tur() failed]
      so regular SCSI commands, that caused / were affected by scsi_eh,
      are moved to work_q and scsi_eh_test_devices() itself returns false.
      In turn, it unnecessarily escalates in our case in scsi_eh_ready_devs()
      beyond host reset to finally scsi_eh_offline_sdevs()
      which sets affected SCSI devices offline with the following kernel message:
      
      "kernel: sd H:0:T:L: Device offlined - not ready after error recovery"
      Signed-off-by: default avatarSteffen Maier <maier@linux.vnet.ibm.com>
      Fixes: ef3eb71d ("[SCSI] zfcp: Introduce experimental support for DIF/DIX")
      Cc: <stable@vger.kernel.org> #2.6.36+
      Reviewed-by: default avatarBenjamin Block <bblock@linux.vnet.ibm.com>
      Signed-off-by: default avatarBenjamin Block <bblock@linux.vnet.ibm.com>
      Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
      71b8e45d