![Christof Schmitt](/assets/img/avatar_default.png)
Use the I/O blocking mechanism in the FC transport class to allow faster failovers for multipathing: - Call fc_remote_port_delete early to set the rport to BLOCKED. - Check the rport status in queuecommand with fc_remote_portchkready to no longer accept new I/O for this port and fail the I/O with the appropriate scsi_cmnd result. - Implement the terminate_rport_io handler to abort all pending I/O requests - Return SCSI commands with DID_TRANSPORT_DISRUPTED while erp is running. - When updating the remote port status, check for late changes and update the remote ports status accordingly. Acked-by: Swen Schillig <swen@vnet.ibm.com> Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
678 lines
20 KiB
C
678 lines
20 KiB
C
/*
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* zfcp device driver
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*
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* Global definitions for the zfcp device driver.
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*
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* Copyright IBM Corporation 2002, 2009
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*/
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#ifndef ZFCP_DEF_H
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#define ZFCP_DEF_H
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/*************************** INCLUDES *****************************************/
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#include <linux/init.h>
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#include <linux/moduleparam.h>
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#include <linux/major.h>
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#include <linux/blkdev.h>
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#include <linux/delay.h>
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#include <linux/timer.h>
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#include <linux/slab.h>
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#include <linux/mempool.h>
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#include <linux/syscalls.h>
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#include <linux/scatterlist.h>
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#include <linux/ioctl.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_tcq.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_transport.h>
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#include <scsi/scsi_transport_fc.h>
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#include <asm/ccwdev.h>
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#include <asm/qdio.h>
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#include <asm/debug.h>
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#include <asm/ebcdic.h>
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#include <asm/sysinfo.h>
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#include "zfcp_dbf.h"
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#include "zfcp_fsf.h"
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/********************* GENERAL DEFINES *********************************/
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#define REQUEST_LIST_SIZE 128
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/********************* SCSI SPECIFIC DEFINES *********************************/
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#define ZFCP_SCSI_ER_TIMEOUT (10*HZ)
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/********************* CIO/QDIO SPECIFIC DEFINES *****************************/
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/* Adapter Identification Parameters */
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#define ZFCP_CONTROL_UNIT_TYPE 0x1731
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#define ZFCP_CONTROL_UNIT_MODEL 0x03
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#define ZFCP_DEVICE_TYPE 0x1732
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#define ZFCP_DEVICE_MODEL 0x03
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#define ZFCP_DEVICE_MODEL_PRIV 0x04
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/* DMQ bug workaround: don't use last SBALE */
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#define ZFCP_MAX_SBALES_PER_SBAL (QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
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/* index of last SBALE (with respect to DMQ bug workaround) */
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#define ZFCP_LAST_SBALE_PER_SBAL (ZFCP_MAX_SBALES_PER_SBAL - 1)
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/* max. number of (data buffer) SBALEs in largest SBAL chain */
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#define ZFCP_MAX_SBALES_PER_REQ \
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(FSF_MAX_SBALS_PER_REQ * ZFCP_MAX_SBALES_PER_SBAL - 2)
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/* request ID + QTCB in SBALE 0 + 1 of first SBAL in chain */
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#define ZFCP_MAX_SECTORS (ZFCP_MAX_SBALES_PER_REQ * 8)
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/* max. number of (data buffer) SBALEs in largest SBAL chain
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multiplied with number of sectors per 4k block */
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/********************* FSF SPECIFIC DEFINES *********************************/
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/* ATTENTION: value must not be used by hardware */
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#define FSF_QTCB_UNSOLICITED_STATUS 0x6305
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/* timeout value for "default timer" for fsf requests */
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#define ZFCP_FSF_REQUEST_TIMEOUT (60*HZ)
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/*************** FIBRE CHANNEL PROTOCOL SPECIFIC DEFINES ********************/
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/* timeout for name-server lookup (in seconds) */
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#define ZFCP_NS_GID_PN_TIMEOUT 10
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/* task attribute values in FCP-2 FCP_CMND IU */
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#define SIMPLE_Q 0
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#define HEAD_OF_Q 1
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#define ORDERED_Q 2
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#define ACA_Q 4
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#define UNTAGGED 5
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/* task management flags in FCP-2 FCP_CMND IU */
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#define FCP_CLEAR_ACA 0x40
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#define FCP_TARGET_RESET 0x20
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#define FCP_LOGICAL_UNIT_RESET 0x10
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#define FCP_CLEAR_TASK_SET 0x04
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#define FCP_ABORT_TASK_SET 0x02
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#define FCP_CDB_LENGTH 16
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#define ZFCP_DID_MASK 0x00FFFFFF
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/* FCP(-2) FCP_CMND IU */
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struct fcp_cmnd_iu {
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u64 fcp_lun; /* FCP logical unit number */
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u8 crn; /* command reference number */
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u8 reserved0:5; /* reserved */
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u8 task_attribute:3; /* task attribute */
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u8 task_management_flags; /* task management flags */
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u8 add_fcp_cdb_length:6; /* additional FCP_CDB length */
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u8 rddata:1; /* read data */
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u8 wddata:1; /* write data */
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u8 fcp_cdb[FCP_CDB_LENGTH];
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} __attribute__((packed));
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/* FCP(-2) FCP_RSP IU */
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struct fcp_rsp_iu {
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u8 reserved0[10];
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union {
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struct {
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u8 reserved1:3;
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u8 fcp_conf_req:1;
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u8 fcp_resid_under:1;
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u8 fcp_resid_over:1;
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u8 fcp_sns_len_valid:1;
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u8 fcp_rsp_len_valid:1;
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} bits;
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u8 value;
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} validity;
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u8 scsi_status;
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u32 fcp_resid;
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u32 fcp_sns_len;
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u32 fcp_rsp_len;
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} __attribute__((packed));
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#define RSP_CODE_GOOD 0
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#define RSP_CODE_LENGTH_MISMATCH 1
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#define RSP_CODE_FIELD_INVALID 2
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#define RSP_CODE_RO_MISMATCH 3
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#define RSP_CODE_TASKMAN_UNSUPP 4
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#define RSP_CODE_TASKMAN_FAILED 5
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/* see fc-fs */
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#define LS_RSCN 0x61
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#define LS_LOGO 0x05
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#define LS_PLOGI 0x03
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struct fcp_rscn_head {
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u8 command;
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u8 page_length; /* always 0x04 */
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u16 payload_len;
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} __attribute__((packed));
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struct fcp_rscn_element {
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u8 reserved:2;
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u8 event_qual:4;
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u8 addr_format:2;
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u32 nport_did:24;
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} __attribute__((packed));
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/* see fc-ph */
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struct fcp_logo {
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u32 command;
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u32 nport_did;
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u64 nport_wwpn;
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} __attribute__((packed));
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/*
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* FC-FS stuff
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*/
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#define R_A_TOV 10 /* seconds */
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#define ZFCP_LS_RLS 0x0f
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#define ZFCP_LS_ADISC 0x52
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#define ZFCP_LS_RPS 0x56
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#define ZFCP_LS_RSCN 0x61
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#define ZFCP_LS_RNID 0x78
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struct zfcp_ls_adisc {
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u8 code;
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u8 field[3];
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u32 hard_nport_id;
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u64 wwpn;
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u64 wwnn;
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u32 nport_id;
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} __attribute__ ((packed));
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/*
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* FC-GS-2 stuff
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*/
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#define ZFCP_CT_REVISION 0x01
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#define ZFCP_CT_DIRECTORY_SERVICE 0xFC
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#define ZFCP_CT_NAME_SERVER 0x02
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#define ZFCP_CT_SYNCHRONOUS 0x00
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#define ZFCP_CT_SCSI_FCP 0x08
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#define ZFCP_CT_UNABLE_TO_PERFORM_CMD 0x09
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#define ZFCP_CT_GID_PN 0x0121
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#define ZFCP_CT_GPN_FT 0x0172
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#define ZFCP_CT_ACCEPT 0x8002
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#define ZFCP_CT_REJECT 0x8001
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/*
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* FC-GS-4 stuff
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*/
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#define ZFCP_CT_TIMEOUT (3 * R_A_TOV)
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/*************** ADAPTER/PORT/UNIT AND FSF_REQ STATUS FLAGS ******************/
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/*
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* Note, the leftmost status byte is common among adapter, port
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* and unit
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*/
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#define ZFCP_COMMON_FLAGS 0xfff00000
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/* common status bits */
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#define ZFCP_STATUS_COMMON_REMOVE 0x80000000
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#define ZFCP_STATUS_COMMON_RUNNING 0x40000000
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#define ZFCP_STATUS_COMMON_ERP_FAILED 0x20000000
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#define ZFCP_STATUS_COMMON_UNBLOCKED 0x10000000
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#define ZFCP_STATUS_COMMON_OPEN 0x04000000
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#define ZFCP_STATUS_COMMON_ERP_INUSE 0x01000000
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#define ZFCP_STATUS_COMMON_ACCESS_DENIED 0x00800000
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#define ZFCP_STATUS_COMMON_ACCESS_BOXED 0x00400000
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#define ZFCP_STATUS_COMMON_NOESC 0x00200000
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/* adapter status */
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#define ZFCP_STATUS_ADAPTER_QDIOUP 0x00000002
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#define ZFCP_STATUS_ADAPTER_XCONFIG_OK 0x00000008
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#define ZFCP_STATUS_ADAPTER_HOST_CON_INIT 0x00000010
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#define ZFCP_STATUS_ADAPTER_ERP_THREAD_UP 0x00000020
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#define ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL 0x00000080
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#define ZFCP_STATUS_ADAPTER_ERP_PENDING 0x00000100
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#define ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED 0x00000200
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/* FC-PH/FC-GS well-known address identifiers for generic services */
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#define ZFCP_DID_WKA 0xFFFFF0
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#define ZFCP_DID_MANAGEMENT_SERVICE 0xFFFFFA
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#define ZFCP_DID_TIME_SERVICE 0xFFFFFB
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#define ZFCP_DID_DIRECTORY_SERVICE 0xFFFFFC
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#define ZFCP_DID_ALIAS_SERVICE 0xFFFFF8
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#define ZFCP_DID_KEY_DISTRIBUTION_SERVICE 0xFFFFF7
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/* remote port status */
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#define ZFCP_STATUS_PORT_PHYS_OPEN 0x00000001
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/* well known address (WKA) port status*/
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enum zfcp_wka_status {
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ZFCP_WKA_PORT_OFFLINE,
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ZFCP_WKA_PORT_CLOSING,
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ZFCP_WKA_PORT_OPENING,
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ZFCP_WKA_PORT_ONLINE,
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};
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/* logical unit status */
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#define ZFCP_STATUS_UNIT_SHARED 0x00000004
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#define ZFCP_STATUS_UNIT_READONLY 0x00000008
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#define ZFCP_STATUS_UNIT_SCSI_WORK_PENDING 0x00000020
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/* FSF request status (this does not have a common part) */
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#define ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT 0x00000002
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#define ZFCP_STATUS_FSFREQ_COMPLETED 0x00000004
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#define ZFCP_STATUS_FSFREQ_ERROR 0x00000008
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#define ZFCP_STATUS_FSFREQ_CLEANUP 0x00000010
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#define ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED 0x00000040
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#define ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED 0x00000080
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#define ZFCP_STATUS_FSFREQ_ABORTED 0x00000100
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#define ZFCP_STATUS_FSFREQ_TMFUNCFAILED 0x00000200
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#define ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP 0x00000400
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#define ZFCP_STATUS_FSFREQ_RETRY 0x00000800
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#define ZFCP_STATUS_FSFREQ_DISMISSED 0x00001000
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/************************* STRUCTURE DEFINITIONS *****************************/
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struct zfcp_fsf_req;
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/* holds various memory pools of an adapter */
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struct zfcp_adapter_mempool {
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mempool_t *fsf_req_erp;
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mempool_t *fsf_req_scsi;
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mempool_t *fsf_req_abort;
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mempool_t *fsf_req_status_read;
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mempool_t *data_status_read;
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mempool_t *data_gid_pn;
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};
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/*
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* header for CT_IU
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*/
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struct ct_hdr {
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u8 revision; // 0x01
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u8 in_id[3]; // 0x00
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u8 gs_type; // 0xFC Directory Service
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u8 gs_subtype; // 0x02 Name Server
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u8 options; // 0x00 single bidirectional exchange
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u8 reserved0;
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u16 cmd_rsp_code; // 0x0121 GID_PN, or 0x0100 GA_NXT
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u16 max_res_size; // <= (4096 - 16) / 4
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u8 reserved1;
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u8 reason_code;
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u8 reason_code_expl;
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u8 vendor_unique;
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} __attribute__ ((packed));
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/* nameserver request CT_IU -- for requests where
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* a port name is required */
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struct ct_iu_gid_pn_req {
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struct ct_hdr header;
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u64 wwpn;
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} __attribute__ ((packed));
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/* FS_ACC IU and data unit for GID_PN nameserver request */
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struct ct_iu_gid_pn_resp {
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struct ct_hdr header;
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u32 d_id;
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} __attribute__ ((packed));
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/**
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* struct zfcp_send_ct - used to pass parameters to function zfcp_fsf_send_ct
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* @wka_port: port where the request is sent to
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* @req: scatter-gather list for request
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* @resp: scatter-gather list for response
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* @handler: handler function (called for response to the request)
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* @handler_data: data passed to handler function
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* @timeout: FSF timeout for this request
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* @completion: completion for synchronization purposes
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* @status: used to pass error status to calling function
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*/
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struct zfcp_send_ct {
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struct zfcp_wka_port *wka_port;
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struct scatterlist *req;
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struct scatterlist *resp;
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void (*handler)(unsigned long);
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unsigned long handler_data;
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int timeout;
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struct completion *completion;
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int status;
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};
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/* used for name server requests in error recovery */
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struct zfcp_gid_pn_data {
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struct zfcp_send_ct ct;
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struct scatterlist req;
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struct scatterlist resp;
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struct ct_iu_gid_pn_req ct_iu_req;
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struct ct_iu_gid_pn_resp ct_iu_resp;
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struct zfcp_port *port;
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};
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/**
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* struct zfcp_send_els - used to pass parameters to function zfcp_fsf_send_els
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* @adapter: adapter where request is sent from
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* @port: port where ELS is destinated (port reference count has to be increased)
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* @d_id: destiniation id of port where request is sent to
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* @req: scatter-gather list for request
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* @resp: scatter-gather list for response
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* @handler: handler function (called for response to the request)
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* @handler_data: data passed to handler function
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* @completion: completion for synchronization purposes
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* @ls_code: hex code of ELS command
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* @status: used to pass error status to calling function
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*/
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struct zfcp_send_els {
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struct zfcp_adapter *adapter;
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struct zfcp_port *port;
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u32 d_id;
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struct scatterlist *req;
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struct scatterlist *resp;
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void (*handler)(unsigned long);
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unsigned long handler_data;
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struct completion *completion;
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int ls_code;
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int status;
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};
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struct zfcp_wka_port {
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struct zfcp_adapter *adapter;
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wait_queue_head_t completion_wq;
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enum zfcp_wka_status status;
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atomic_t refcount;
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u32 d_id;
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u32 handle;
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struct mutex mutex;
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struct delayed_work work;
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};
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struct zfcp_qdio_queue {
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struct qdio_buffer *sbal[QDIO_MAX_BUFFERS_PER_Q];
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u8 first; /* index of next free bfr in queue */
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atomic_t count; /* number of free buffers in queue */
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};
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struct zfcp_erp_action {
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struct list_head list;
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int action; /* requested action code */
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struct zfcp_adapter *adapter; /* device which should be recovered */
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struct zfcp_port *port;
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struct zfcp_unit *unit;
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u32 status; /* recovery status */
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u32 step; /* active step of this erp action */
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struct zfcp_fsf_req *fsf_req; /* fsf request currently pending
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for this action */
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struct timer_list timer;
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};
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struct fsf_latency_record {
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u32 min;
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u32 max;
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u64 sum;
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};
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struct latency_cont {
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struct fsf_latency_record channel;
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struct fsf_latency_record fabric;
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u64 counter;
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};
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struct zfcp_latencies {
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struct latency_cont read;
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struct latency_cont write;
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struct latency_cont cmd;
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spinlock_t lock;
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};
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struct zfcp_adapter {
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atomic_t refcount; /* reference count */
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wait_queue_head_t remove_wq; /* can be used to wait for
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refcount drop to zero */
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u64 peer_wwnn; /* P2P peer WWNN */
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u64 peer_wwpn; /* P2P peer WWPN */
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u32 peer_d_id; /* P2P peer D_ID */
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struct ccw_device *ccw_device; /* S/390 ccw device */
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u32 hydra_version; /* Hydra version */
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u32 fsf_lic_version;
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u32 adapter_features; /* FCP channel features */
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u32 connection_features; /* host connection features */
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u32 hardware_version; /* of FCP channel */
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u16 timer_ticks; /* time int for a tick */
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struct Scsi_Host *scsi_host; /* Pointer to mid-layer */
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struct list_head port_list_head; /* remote port list */
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unsigned long req_no; /* unique FSF req number */
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struct list_head *req_list; /* list of pending reqs */
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spinlock_t req_list_lock; /* request list lock */
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struct zfcp_qdio_queue req_q; /* request queue */
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spinlock_t req_q_lock; /* for operations on queue */
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ktime_t req_q_time; /* time of last fill level change */
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u64 req_q_util; /* for accounting */
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spinlock_t qdio_stat_lock;
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u32 fsf_req_seq_no; /* FSF cmnd seq number */
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wait_queue_head_t request_wq; /* can be used to wait for
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more avaliable SBALs */
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struct zfcp_qdio_queue resp_q; /* response queue */
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rwlock_t abort_lock; /* Protects against SCSI
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stack abort/command
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completion races */
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atomic_t stat_miss; /* # missing status reads*/
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struct work_struct stat_work;
|
|
atomic_t status; /* status of this adapter */
|
|
struct list_head erp_ready_head; /* error recovery for this
|
|
adapter/devices */
|
|
struct list_head erp_running_head;
|
|
rwlock_t erp_lock;
|
|
struct semaphore erp_ready_sem;
|
|
wait_queue_head_t erp_thread_wqh;
|
|
wait_queue_head_t erp_done_wqh;
|
|
struct zfcp_erp_action erp_action; /* pending error recovery */
|
|
atomic_t erp_counter;
|
|
u32 erp_total_count; /* total nr of enqueued erp
|
|
actions */
|
|
u32 erp_low_mem_count; /* nr of erp actions waiting
|
|
for memory */
|
|
struct zfcp_wka_port nsp; /* adapter's nameserver */
|
|
debug_info_t *rec_dbf;
|
|
debug_info_t *hba_dbf;
|
|
debug_info_t *san_dbf; /* debug feature areas */
|
|
debug_info_t *scsi_dbf;
|
|
spinlock_t rec_dbf_lock;
|
|
spinlock_t hba_dbf_lock;
|
|
spinlock_t san_dbf_lock;
|
|
spinlock_t scsi_dbf_lock;
|
|
struct zfcp_rec_dbf_record rec_dbf_buf;
|
|
struct zfcp_hba_dbf_record hba_dbf_buf;
|
|
struct zfcp_san_dbf_record san_dbf_buf;
|
|
struct zfcp_scsi_dbf_record scsi_dbf_buf;
|
|
struct zfcp_adapter_mempool pool; /* Adapter memory pools */
|
|
struct qdio_initialize qdio_init_data; /* for qdio_establish */
|
|
struct fc_host_statistics *fc_stats;
|
|
struct fsf_qtcb_bottom_port *stats_reset_data;
|
|
unsigned long stats_reset;
|
|
struct work_struct scan_work;
|
|
struct service_level service_level;
|
|
atomic_t qdio_outb_full; /* queue full incidents */
|
|
};
|
|
|
|
struct zfcp_port {
|
|
struct device sysfs_device; /* sysfs device */
|
|
struct fc_rport *rport; /* rport of fc transport class */
|
|
struct list_head list; /* list of remote ports */
|
|
atomic_t refcount; /* reference count */
|
|
wait_queue_head_t remove_wq; /* can be used to wait for
|
|
refcount drop to zero */
|
|
struct zfcp_adapter *adapter; /* adapter used to access port */
|
|
struct list_head unit_list_head; /* head of logical unit list */
|
|
atomic_t status; /* status of this remote port */
|
|
u64 wwnn; /* WWNN if known */
|
|
u64 wwpn; /* WWPN */
|
|
u32 d_id; /* D_ID */
|
|
u32 handle; /* handle assigned by FSF */
|
|
struct zfcp_erp_action erp_action; /* pending error recovery */
|
|
atomic_t erp_counter;
|
|
u32 maxframe_size;
|
|
u32 supported_classes;
|
|
struct work_struct gid_pn_work;
|
|
struct work_struct test_link_work;
|
|
struct work_struct rport_work;
|
|
enum { RPORT_NONE, RPORT_ADD, RPORT_DEL } rport_task;
|
|
};
|
|
|
|
struct zfcp_unit {
|
|
struct device sysfs_device; /* sysfs device */
|
|
struct list_head list; /* list of logical units */
|
|
atomic_t refcount; /* reference count */
|
|
wait_queue_head_t remove_wq; /* can be used to wait for
|
|
refcount drop to zero */
|
|
struct zfcp_port *port; /* remote port of unit */
|
|
atomic_t status; /* status of this logical unit */
|
|
u64 fcp_lun; /* own FCP_LUN */
|
|
u32 handle; /* handle assigned by FSF */
|
|
struct scsi_device *device; /* scsi device struct pointer */
|
|
struct zfcp_erp_action erp_action; /* pending error recovery */
|
|
atomic_t erp_counter;
|
|
struct zfcp_latencies latencies;
|
|
};
|
|
|
|
/* FSF request */
|
|
struct zfcp_fsf_req {
|
|
struct list_head list; /* list of FSF requests */
|
|
unsigned long req_id; /* unique request ID */
|
|
struct zfcp_adapter *adapter; /* adapter request belongs to */
|
|
u8 sbal_number; /* nr of SBALs free for use */
|
|
u8 sbal_first; /* first SBAL for this request */
|
|
u8 sbal_last; /* last SBAL for this request */
|
|
u8 sbal_limit; /* last possible SBAL for
|
|
this reuest */
|
|
u8 sbale_curr; /* current SBALE during creation
|
|
of request */
|
|
u8 sbal_response; /* SBAL used in interrupt */
|
|
wait_queue_head_t completion_wq; /* can be used by a routine
|
|
to wait for completion */
|
|
u32 status; /* status of this request */
|
|
u32 fsf_command; /* FSF Command copy */
|
|
struct fsf_qtcb *qtcb; /* address of associated QTCB */
|
|
u32 seq_no; /* Sequence number of request */
|
|
void *data; /* private data of request */
|
|
struct timer_list timer; /* used for erp or scsi er */
|
|
struct zfcp_erp_action *erp_action; /* used if this request is
|
|
issued on behalf of erp */
|
|
mempool_t *pool; /* used if request was alloacted
|
|
from emergency pool */
|
|
unsigned long long issued; /* request sent time (STCK) */
|
|
struct zfcp_unit *unit;
|
|
void (*handler)(struct zfcp_fsf_req *);
|
|
u16 qdio_outb_usage;/* usage of outbound queue */
|
|
u16 qdio_inb_usage; /* usage of inbound queue */
|
|
};
|
|
|
|
/* driver data */
|
|
struct zfcp_data {
|
|
struct scsi_host_template scsi_host_template;
|
|
struct scsi_transport_template *scsi_transport_template;
|
|
rwlock_t config_lock; /* serialises changes
|
|
to adapter/port/unit
|
|
lists */
|
|
struct semaphore config_sema; /* serialises configuration
|
|
changes */
|
|
struct kmem_cache *fsf_req_qtcb_cache;
|
|
struct kmem_cache *sr_buffer_cache;
|
|
struct kmem_cache *gid_pn_cache;
|
|
struct workqueue_struct *work_queue;
|
|
};
|
|
|
|
/* struct used by memory pools for fsf_requests */
|
|
struct zfcp_fsf_req_qtcb {
|
|
struct zfcp_fsf_req fsf_req;
|
|
struct fsf_qtcb qtcb;
|
|
};
|
|
|
|
/********************** ZFCP SPECIFIC DEFINES ********************************/
|
|
|
|
#define ZFCP_SET 0x00000100
|
|
#define ZFCP_CLEAR 0x00000200
|
|
|
|
/*
|
|
* Helper functions for request ID management.
|
|
*/
|
|
static inline int zfcp_reqlist_hash(unsigned long req_id)
|
|
{
|
|
return req_id % REQUEST_LIST_SIZE;
|
|
}
|
|
|
|
static inline void zfcp_reqlist_remove(struct zfcp_adapter *adapter,
|
|
struct zfcp_fsf_req *fsf_req)
|
|
{
|
|
list_del(&fsf_req->list);
|
|
}
|
|
|
|
static inline struct zfcp_fsf_req *
|
|
zfcp_reqlist_find(struct zfcp_adapter *adapter, unsigned long req_id)
|
|
{
|
|
struct zfcp_fsf_req *request;
|
|
unsigned int idx;
|
|
|
|
idx = zfcp_reqlist_hash(req_id);
|
|
list_for_each_entry(request, &adapter->req_list[idx], list)
|
|
if (request->req_id == req_id)
|
|
return request;
|
|
return NULL;
|
|
}
|
|
|
|
static inline struct zfcp_fsf_req *
|
|
zfcp_reqlist_find_safe(struct zfcp_adapter *adapter, struct zfcp_fsf_req *req)
|
|
{
|
|
struct zfcp_fsf_req *request;
|
|
unsigned int idx;
|
|
|
|
for (idx = 0; idx < REQUEST_LIST_SIZE; idx++) {
|
|
list_for_each_entry(request, &adapter->req_list[idx], list)
|
|
if (request == req)
|
|
return request;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* functions needed for reference/usage counting
|
|
*/
|
|
|
|
static inline void
|
|
zfcp_unit_get(struct zfcp_unit *unit)
|
|
{
|
|
atomic_inc(&unit->refcount);
|
|
}
|
|
|
|
static inline void
|
|
zfcp_unit_put(struct zfcp_unit *unit)
|
|
{
|
|
if (atomic_dec_return(&unit->refcount) == 0)
|
|
wake_up(&unit->remove_wq);
|
|
}
|
|
|
|
static inline void
|
|
zfcp_port_get(struct zfcp_port *port)
|
|
{
|
|
atomic_inc(&port->refcount);
|
|
}
|
|
|
|
static inline void
|
|
zfcp_port_put(struct zfcp_port *port)
|
|
{
|
|
if (atomic_dec_return(&port->refcount) == 0)
|
|
wake_up(&port->remove_wq);
|
|
}
|
|
|
|
static inline void
|
|
zfcp_adapter_get(struct zfcp_adapter *adapter)
|
|
{
|
|
atomic_inc(&adapter->refcount);
|
|
}
|
|
|
|
static inline void
|
|
zfcp_adapter_put(struct zfcp_adapter *adapter)
|
|
{
|
|
if (atomic_dec_return(&adapter->refcount) == 0)
|
|
wake_up(&adapter->remove_wq);
|
|
}
|
|
|
|
#endif /* ZFCP_DEF_H */
|