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linux/drivers/s390/scsi/zfcp_dbf.h
Steffen Maier 56d23ed7ad scsi: zfcp: do not trace pure benign residual HBA responses at default level 
Since quite a while, Linux issues enough SCSI commands per scsi_device
which successfully return with FCP_RESID_UNDER, FSF_FCP_RSP_AVAILABLE,
and SAM_STAT_GOOD.  This floods the HBA trace area and we cannot see
other and important HBA trace records long enough.

Therefore, do not trace HBA response errors for pure benign residual
under counts at the default trace level.

This excludes benign residual under count combined with other validity
bits set in FCP_RSP_IU, such as FCP_SNS_LEN_VAL.  For all those other
cases, we still do want to see both the HBA record and the corresponding
SCSI record by default.

Signed-off-by: Steffen Maier <maier@linux.vnet.ibm.com>
Fixes: a54ca0f62f ("[SCSI] zfcp: Redesign of the debug tracing for HBA records.")
Cc: <stable@vger.kernel.org> #2.6.37+
Reviewed-by: Benjamin Block <bblock@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2016-12-14 15:15:48 -05:00

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/*
* zfcp device driver
* debug feature declarations
*
* Copyright IBM Corp. 2008, 2016
*/
#ifndef ZFCP_DBF_H
#define ZFCP_DBF_H
#include <scsi/fc/fc_fcp.h>
#include "zfcp_ext.h"
#include "zfcp_fsf.h"
#include "zfcp_def.h"
#define ZFCP_DBF_TAG_LEN 7
#define ZFCP_DBF_INVALID_LUN 0xFFFFFFFFFFFFFFFFull
enum zfcp_dbf_pseudo_erp_act_type {
ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD = 0xff,
ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL = 0xfe,
};
/**
* struct zfcp_dbf_rec_trigger - trace record for triggered recovery action
* @ready: number of ready recovery actions
* @running: number of running recovery actions
* @want: wanted recovery action
* @need: needed recovery action
*/
struct zfcp_dbf_rec_trigger {
u32 ready;
u32 running;
u8 want;
u8 need;
} __packed;
/**
* struct zfcp_dbf_rec_running - trace record for running recovery
* @fsf_req_id: request id for fsf requests
* @rec_status: status of the fsf request
* @rec_step: current step of the recovery action
* rec_count: recovery counter
*/
struct zfcp_dbf_rec_running {
u64 fsf_req_id;
u32 rec_status;
u16 rec_step;
u8 rec_action;
u8 rec_count;
} __packed;
/**
* enum zfcp_dbf_rec_id - recovery trace record id
* @ZFCP_DBF_REC_TRIG: triggered recovery identifier
* @ZFCP_DBF_REC_RUN: running recovery identifier
*/
enum zfcp_dbf_rec_id {
ZFCP_DBF_REC_TRIG = 1,
ZFCP_DBF_REC_RUN = 2,
};
/**
* struct zfcp_dbf_rec - trace record for error recovery actions
* @id: unique number of recovery record type
* @tag: identifier string specifying the location of initiation
* @lun: logical unit number
* @wwpn: word wide port number
* @d_id: destination ID
* @adapter_status: current status of the adapter
* @port_status: current status of the port
* @lun_status: current status of the lun
* @u.trig: structure zfcp_dbf_rec_trigger
* @u.run: structure zfcp_dbf_rec_running
*/
struct zfcp_dbf_rec {
u8 id;
char tag[ZFCP_DBF_TAG_LEN];
u64 lun;
u64 wwpn;
u32 d_id;
u32 adapter_status;
u32 port_status;
u32 lun_status;
union {
struct zfcp_dbf_rec_trigger trig;
struct zfcp_dbf_rec_running run;
} u;
} __packed;
/**
* enum zfcp_dbf_san_id - SAN trace record identifier
* @ZFCP_DBF_SAN_REQ: request trace record id
* @ZFCP_DBF_SAN_RES: response trace record id
* @ZFCP_DBF_SAN_ELS: extended link service record id
*/
enum zfcp_dbf_san_id {
ZFCP_DBF_SAN_REQ = 1,
ZFCP_DBF_SAN_RES = 2,
ZFCP_DBF_SAN_ELS = 3,
};
/** struct zfcp_dbf_san - trace record for SAN requests and responses
* @id: unique number of recovery record type
* @tag: identifier string specifying the location of initiation
* @fsf_req_id: request id for fsf requests
* @payload: unformatted information related to request/response
* @d_id: destination id
*/
struct zfcp_dbf_san {
u8 id;
char tag[ZFCP_DBF_TAG_LEN];
u64 fsf_req_id;
u32 d_id;
#define ZFCP_DBF_SAN_MAX_PAYLOAD (FC_CT_HDR_LEN + 32)
char payload[ZFCP_DBF_SAN_MAX_PAYLOAD];
u16 pl_len;
} __packed;
/**
* struct zfcp_dbf_hba_res - trace record for hba responses
* @req_issued: timestamp when request was issued
* @prot_status: protocol status
* @prot_status_qual: protocol status qualifier
* @fsf_status: fsf status
* @fsf_status_qual: fsf status qualifier
*/
struct zfcp_dbf_hba_res {
u64 req_issued;
u32 prot_status;
u8 prot_status_qual[FSF_PROT_STATUS_QUAL_SIZE];
u32 fsf_status;
u8 fsf_status_qual[FSF_STATUS_QUALIFIER_SIZE];
u32 port_handle;
u32 lun_handle;
} __packed;
/**
* struct zfcp_dbf_hba_uss - trace record for unsolicited status
* @status_type: type of unsolicited status
* @status_subtype: subtype of unsolicited status
* @d_id: destination ID
* @lun: logical unit number
* @queue_designator: queue designator
*/
struct zfcp_dbf_hba_uss {
u32 status_type;
u32 status_subtype;
u32 d_id;
u64 lun;
u64 queue_designator;
} __packed;
/**
* enum zfcp_dbf_hba_id - HBA trace record identifier
* @ZFCP_DBF_HBA_RES: response trace record
* @ZFCP_DBF_HBA_USS: unsolicited status trace record
* @ZFCP_DBF_HBA_BIT: bit error trace record
*/
enum zfcp_dbf_hba_id {
ZFCP_DBF_HBA_RES = 1,
ZFCP_DBF_HBA_USS = 2,
ZFCP_DBF_HBA_BIT = 3,
ZFCP_DBF_HBA_BASIC = 4,
};
/**
* struct zfcp_dbf_hba - common trace record for HBA records
* @id: unique number of recovery record type
* @tag: identifier string specifying the location of initiation
* @fsf_req_id: request id for fsf requests
* @fsf_req_status: status of fsf request
* @fsf_cmd: fsf command
* @fsf_seq_no: fsf sequence number
* @pl_len: length of payload stored as zfcp_dbf_pay
* @u: record type specific data
*/
struct zfcp_dbf_hba {
u8 id;
char tag[ZFCP_DBF_TAG_LEN];
u64 fsf_req_id;
u32 fsf_req_status;
u32 fsf_cmd;
u32 fsf_seq_no;
u16 pl_len;
union {
struct zfcp_dbf_hba_res res;
struct zfcp_dbf_hba_uss uss;
struct fsf_bit_error_payload be;
} u;
} __packed;
/**
* enum zfcp_dbf_scsi_id - scsi trace record identifier
* @ZFCP_DBF_SCSI_CMND: scsi command trace record
*/
enum zfcp_dbf_scsi_id {
ZFCP_DBF_SCSI_CMND = 1,
};
/**
* struct zfcp_dbf_scsi - common trace record for SCSI records
* @id: unique number of recovery record type
* @tag: identifier string specifying the location of initiation
* @scsi_id: scsi device id
* @scsi_lun: scsi device logical unit number
* @scsi_result: scsi result
* @scsi_retries: current retry number of scsi request
* @scsi_allowed: allowed retries
* @fcp_rsp_info: FCP response info
* @scsi_opcode: scsi opcode
* @fsf_req_id: request id of fsf request
* @host_scribble: LLD specific data attached to SCSI request
* @pl_len: length of paload stored as zfcp_dbf_pay
* @fsf_rsp: response for fsf request
*/
struct zfcp_dbf_scsi {
u8 id;
char tag[ZFCP_DBF_TAG_LEN];
u32 scsi_id;
u32 scsi_lun;
u32 scsi_result;
u8 scsi_retries;
u8 scsi_allowed;
u8 fcp_rsp_info;
#define ZFCP_DBF_SCSI_OPCODE 16
u8 scsi_opcode[ZFCP_DBF_SCSI_OPCODE];
u64 fsf_req_id;
u64 host_scribble;
u16 pl_len;
struct fcp_resp_with_ext fcp_rsp;
} __packed;
/**
* struct zfcp_dbf_pay - trace record for unformatted payload information
* @area: area this record is originated from
* @counter: ascending record number
* @fsf_req_id: request id of fsf request
* @data: unformatted data
*/
struct zfcp_dbf_pay {
u8 counter;
char area[ZFCP_DBF_TAG_LEN];
u64 fsf_req_id;
#define ZFCP_DBF_PAY_MAX_REC 0x100
char data[ZFCP_DBF_PAY_MAX_REC];
} __packed;
/**
* struct zfcp_dbf - main dbf trace structure
* @pay: reference to payload trace area
* @rec: reference to recovery trace area
* @hba: reference to hba trace area
* @san: reference to san trace area
* @scsi: reference to scsi trace area
* @pay_lock: lock protecting payload trace buffer
* @rec_lock: lock protecting recovery trace buffer
* @hba_lock: lock protecting hba trace buffer
* @san_lock: lock protecting san trace buffer
* @scsi_lock: lock protecting scsi trace buffer
* @pay_buf: pre-allocated buffer for payload
* @rec_buf: pre-allocated buffer for recovery
* @hba_buf: pre-allocated buffer for hba
* @san_buf: pre-allocated buffer for san
* @scsi_buf: pre-allocated buffer for scsi
*/
struct zfcp_dbf {
debug_info_t *pay;
debug_info_t *rec;
debug_info_t *hba;
debug_info_t *san;
debug_info_t *scsi;
spinlock_t pay_lock;
spinlock_t rec_lock;
spinlock_t hba_lock;
spinlock_t san_lock;
spinlock_t scsi_lock;
struct zfcp_dbf_pay pay_buf;
struct zfcp_dbf_rec rec_buf;
struct zfcp_dbf_hba hba_buf;
struct zfcp_dbf_san san_buf;
struct zfcp_dbf_scsi scsi_buf;
};
/**
* zfcp_dbf_hba_fsf_resp_suppress - true if we should not trace by default
* @req: request that has been completed
*
* Returns true if FCP response with only benign residual under count.
*/
static inline
bool zfcp_dbf_hba_fsf_resp_suppress(struct zfcp_fsf_req *req)
{
struct fsf_qtcb *qtcb = req->qtcb;
u32 fsf_stat = qtcb->header.fsf_status;
struct fcp_resp *fcp_rsp;
u8 rsp_flags, fr_status;
if (qtcb->prefix.qtcb_type != FSF_IO_COMMAND)
return false; /* not an FCP response */
fcp_rsp = (struct fcp_resp *)&qtcb->bottom.io.fcp_rsp;
rsp_flags = fcp_rsp->fr_flags;
fr_status = fcp_rsp->fr_status;
return (fsf_stat == FSF_FCP_RSP_AVAILABLE) &&
(rsp_flags == FCP_RESID_UNDER) &&
(fr_status == SAM_STAT_GOOD);
}
static inline
void zfcp_dbf_hba_fsf_resp(char *tag, int level, struct zfcp_fsf_req *req)
{
if (debug_level_enabled(req->adapter->dbf->hba, level))
zfcp_dbf_hba_fsf_res(tag, level, req);
}
/**
* zfcp_dbf_hba_fsf_response - trace event for request completion
* @req: request that has been completed
*/
static inline
void zfcp_dbf_hba_fsf_response(struct zfcp_fsf_req *req)
{
struct fsf_qtcb *qtcb = req->qtcb;
if ((qtcb->prefix.prot_status != FSF_PROT_GOOD) &&
(qtcb->prefix.prot_status != FSF_PROT_FSF_STATUS_PRESENTED)) {
zfcp_dbf_hba_fsf_resp("fs_perr", 1, req);
} else if (qtcb->header.fsf_status != FSF_GOOD) {
zfcp_dbf_hba_fsf_resp("fs_ferr",
zfcp_dbf_hba_fsf_resp_suppress(req)
? 5 : 1, req);
} else if ((req->fsf_command == FSF_QTCB_OPEN_PORT_WITH_DID) ||
(req->fsf_command == FSF_QTCB_OPEN_LUN)) {
zfcp_dbf_hba_fsf_resp("fs_open", 4, req);
} else if (qtcb->header.log_length) {
zfcp_dbf_hba_fsf_resp("fs_qtcb", 5, req);
} else {
zfcp_dbf_hba_fsf_resp("fs_norm", 6, req);
}
}
static inline
void _zfcp_dbf_scsi(char *tag, int level, struct scsi_cmnd *scmd,
struct zfcp_fsf_req *req)
{
struct zfcp_adapter *adapter = (struct zfcp_adapter *)
scmd->device->host->hostdata[0];
if (debug_level_enabled(adapter->dbf->scsi, level))
zfcp_dbf_scsi(tag, level, scmd, req);
}
/**
* zfcp_dbf_scsi_result - trace event for SCSI command completion
* @scmd: SCSI command pointer
* @req: FSF request used to issue SCSI command
*/
static inline
void zfcp_dbf_scsi_result(struct scsi_cmnd *scmd, struct zfcp_fsf_req *req)
{
if (scmd->result != 0)
_zfcp_dbf_scsi("rsl_err", 3, scmd, req);
else if (scmd->retries > 0)
_zfcp_dbf_scsi("rsl_ret", 4, scmd, req);
else
_zfcp_dbf_scsi("rsl_nor", 6, scmd, req);
}
/**
* zfcp_dbf_scsi_fail_send - trace event for failure to send SCSI command
* @scmd: SCSI command pointer
*/
static inline
void zfcp_dbf_scsi_fail_send(struct scsi_cmnd *scmd)
{
_zfcp_dbf_scsi("rsl_fai", 4, scmd, NULL);
}
/**
* zfcp_dbf_scsi_abort - trace event for SCSI command abort
* @tag: tag indicating success or failure of abort operation
* @scmd: SCSI command to be aborted
* @fsf_req: request containing abort (might be NULL)
*/
static inline
void zfcp_dbf_scsi_abort(char *tag, struct scsi_cmnd *scmd,
struct zfcp_fsf_req *fsf_req)
{
_zfcp_dbf_scsi(tag, 1, scmd, fsf_req);
}
/**
* zfcp_dbf_scsi_devreset - trace event for Logical Unit or Target Reset
* @tag: tag indicating success or failure of reset operation
* @scmnd: SCSI command which caused this error recovery
* @flag: indicates type of reset (Target Reset, Logical Unit Reset)
*/
static inline
void zfcp_dbf_scsi_devreset(char *tag, struct scsi_cmnd *scmnd, u8 flag)
{
char tmp_tag[ZFCP_DBF_TAG_LEN];
if (flag == FCP_TMF_TGT_RESET)
memcpy(tmp_tag, "tr_", 3);
else
memcpy(tmp_tag, "lr_", 3);
memcpy(&tmp_tag[3], tag, 4);
_zfcp_dbf_scsi(tmp_tag, 1, scmnd, NULL);
}
/**
* zfcp_dbf_scsi_nullcmnd() - trace NULLify of SCSI command in dev/tgt-reset.
* @scmnd: SCSI command that was NULLified.
* @fsf_req: request that owned @scmnd.
*/
static inline void zfcp_dbf_scsi_nullcmnd(struct scsi_cmnd *scmnd,
struct zfcp_fsf_req *fsf_req)
{
_zfcp_dbf_scsi("scfc__1", 3, scmnd, fsf_req);
}
#endif /* ZFCP_DBF_H */
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