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linux-next/drivers/s390/scsi/zfcp_fc.h
Swen Schillig 51375ee837 [SCSI] zfcp: Set hardware timeout as requested by BSG request. 
The hardware used with zfcp provides a timer for CT and ELS requests
instead of an abort capability for these commands. To correctly handle
the FC BSG timeouts, pass the timeout from the BSG requests to the
hardware.

Signed-off-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2010-01-17 12:40:13 -06:00

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/*
* zfcp device driver
*
* Fibre Channel related definitions and inline functions for the zfcp
* device driver
*
* Copyright IBM Corporation 2009
*/
#ifndef ZFCP_FC_H
#define ZFCP_FC_H
#include <scsi/fc/fc_els.h>
#include <scsi/fc/fc_fcp.h>
#include <scsi/fc/fc_ns.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_tcq.h>
#include "zfcp_fsf.h"
#define ZFCP_FC_CT_SIZE_PAGE (PAGE_SIZE - sizeof(struct fc_ct_hdr))
#define ZFCP_FC_GPN_FT_ENT_PAGE (ZFCP_FC_CT_SIZE_PAGE \
/ sizeof(struct fc_gpn_ft_resp))
#define ZFCP_FC_GPN_FT_NUM_BUFS 4 /* memory pages */
#define ZFCP_FC_GPN_FT_MAX_SIZE (ZFCP_FC_GPN_FT_NUM_BUFS * PAGE_SIZE \
- sizeof(struct fc_ct_hdr))
#define ZFCP_FC_GPN_FT_MAX_ENT (ZFCP_FC_GPN_FT_NUM_BUFS * \
(ZFCP_FC_GPN_FT_ENT_PAGE + 1))
#define ZFCP_FC_CTELS_TMO (2 * FC_DEF_R_A_TOV / 1000)
/**
* struct zfcp_fc_gid_pn_req - container for ct header plus gid_pn request
* @ct_hdr: FC GS common transport header
* @gid_pn: GID_PN request
*/
struct zfcp_fc_gid_pn_req {
struct fc_ct_hdr ct_hdr;
struct fc_ns_gid_pn gid_pn;
} __packed;
/**
* struct zfcp_fc_gid_pn_resp - container for ct header plus gid_pn response
* @ct_hdr: FC GS common transport header
* @gid_pn: GID_PN response
*/
struct zfcp_fc_gid_pn_resp {
struct fc_ct_hdr ct_hdr;
struct fc_gid_pn_resp gid_pn;
} __packed;
/**
* struct zfcp_fc_gid_pn - everything required in zfcp for gid_pn request
* @ct: data passed to zfcp_fsf for issuing fsf request
* @sg_req: scatterlist entry for request data
* @sg_resp: scatterlist entry for response data
* @gid_pn_req: GID_PN request data
* @gid_pn_resp: GID_PN response data
*/
struct zfcp_fc_gid_pn {
struct zfcp_fsf_ct_els ct;
struct scatterlist sg_req;
struct scatterlist sg_resp;
struct zfcp_fc_gid_pn_req gid_pn_req;
struct zfcp_fc_gid_pn_resp gid_pn_resp;
struct zfcp_port *port;
};
/**
* struct zfcp_fc_gpn_ft - container for ct header plus gpn_ft request
* @ct_hdr: FC GS common transport header
* @gpn_ft: GPN_FT request
*/
struct zfcp_fc_gpn_ft_req {
struct fc_ct_hdr ct_hdr;
struct fc_ns_gid_ft gpn_ft;
} __packed;
/**
* struct zfcp_fc_gpn_ft_resp - container for ct header plus gpn_ft response
* @ct_hdr: FC GS common transport header
* @gpn_ft: Array of gpn_ft response data to fill one memory page
*/
struct zfcp_fc_gpn_ft_resp {
struct fc_ct_hdr ct_hdr;
struct fc_gpn_ft_resp gpn_ft[ZFCP_FC_GPN_FT_ENT_PAGE];
} __packed;
/**
* struct zfcp_fc_gpn_ft - zfcp data for gpn_ft request
* @ct: data passed to zfcp_fsf for issuing fsf request
* @sg_req: scatter list entry for gpn_ft request
* @sg_resp: scatter list entries for gpn_ft responses (per memory page)
*/
struct zfcp_fc_gpn_ft {
struct zfcp_fsf_ct_els ct;
struct scatterlist sg_req;
struct scatterlist sg_resp[ZFCP_FC_GPN_FT_NUM_BUFS];
};
/**
* struct zfcp_fc_els_adisc - everything required in zfcp for issuing ELS ADISC
* @els: data required for issuing els fsf command
* @req: scatterlist entry for ELS ADISC request
* @resp: scatterlist entry for ELS ADISC response
* @adisc_req: ELS ADISC request data
* @adisc_resp: ELS ADISC response data
*/
struct zfcp_fc_els_adisc {
struct zfcp_fsf_ct_els els;
struct scatterlist req;
struct scatterlist resp;
struct fc_els_adisc adisc_req;
struct fc_els_adisc adisc_resp;
};
/**
* enum zfcp_fc_wka_status - FC WKA port status in zfcp
* @ZFCP_FC_WKA_PORT_OFFLINE: Port is closed and not in use
* @ZFCP_FC_WKA_PORT_CLOSING: The FSF "close port" request is pending
* @ZFCP_FC_WKA_PORT_OPENING: The FSF "open port" request is pending
* @ZFCP_FC_WKA_PORT_ONLINE: The port is open and the port handle is valid
*/
enum zfcp_fc_wka_status {
ZFCP_FC_WKA_PORT_OFFLINE,
ZFCP_FC_WKA_PORT_CLOSING,
ZFCP_FC_WKA_PORT_OPENING,
ZFCP_FC_WKA_PORT_ONLINE,
};
/**
* struct zfcp_fc_wka_port - representation of well-known-address (WKA) FC port
* @adapter: Pointer to adapter structure this WKA port belongs to
* @completion_wq: Wait for completion of open/close command
* @status: Current status of WKA port
* @refcount: Reference count to keep port open as long as it is in use
* @d_id: FC destination id or well-known-address
* @handle: FSF handle for the open WKA port
* @mutex: Mutex used during opening/closing state changes
* @work: For delaying the closing of the WKA port
*/
struct zfcp_fc_wka_port {
struct zfcp_adapter *adapter;
wait_queue_head_t completion_wq;
enum zfcp_fc_wka_status status;
atomic_t refcount;
u32 d_id;
u32 handle;
struct mutex mutex;
struct delayed_work work;
};
/**
* struct zfcp_fc_wka_ports - Data structures for FC generic services
* @ms: FC Management service
* @ts: FC time service
* @ds: FC directory service
* @as: FC alias service
*/
struct zfcp_fc_wka_ports {
struct zfcp_fc_wka_port ms;
struct zfcp_fc_wka_port ts;
struct zfcp_fc_wka_port ds;
struct zfcp_fc_wka_port as;
};
/**
* zfcp_fc_scsi_to_fcp - setup FCP command with data from scsi_cmnd
* @fcp: fcp_cmnd to setup
* @scsi: scsi_cmnd where to get LUN, task attributes/flags and CDB
*/
static inline
void zfcp_fc_scsi_to_fcp(struct fcp_cmnd *fcp, struct scsi_cmnd *scsi)
{
char tag[2];
int_to_scsilun(scsi->device->lun, (struct scsi_lun *) &fcp->fc_lun);
if (scsi_populate_tag_msg(scsi, tag)) {
switch (tag[0]) {
case MSG_ORDERED_TAG:
fcp->fc_pri_ta |= FCP_PTA_ORDERED;
break;
case MSG_SIMPLE_TAG:
fcp->fc_pri_ta |= FCP_PTA_SIMPLE;
break;
};
} else
fcp->fc_pri_ta = FCP_PTA_SIMPLE;
if (scsi->sc_data_direction == DMA_FROM_DEVICE)
fcp->fc_flags |= FCP_CFL_RDDATA;
if (scsi->sc_data_direction == DMA_TO_DEVICE)
fcp->fc_flags |= FCP_CFL_WRDATA;
memcpy(fcp->fc_cdb, scsi->cmnd, scsi->cmd_len);
fcp->fc_dl = scsi_bufflen(scsi);
}
/**
* zfcp_fc_fcp_tm - setup FCP command as task management command
* @fcp: fcp_cmnd to setup
* @dev: scsi_device where to send the task management command
* @tm: task management flags to setup tm command
*/
static inline
void zfcp_fc_fcp_tm(struct fcp_cmnd *fcp, struct scsi_device *dev, u8 tm_flags)
{
int_to_scsilun(dev->lun, (struct scsi_lun *) &fcp->fc_lun);
fcp->fc_tm_flags |= tm_flags;
}
/**
* zfcp_fc_evap_fcp_rsp - evaluate FCP RSP IU and update scsi_cmnd accordingly
* @fcp_rsp: FCP RSP IU to evaluate
* @scsi: SCSI command where to update status and sense buffer
*/
static inline
void zfcp_fc_eval_fcp_rsp(struct fcp_resp_with_ext *fcp_rsp,
struct scsi_cmnd *scsi)
{
struct fcp_resp_rsp_info *rsp_info;
char *sense;
u32 sense_len, resid;
u8 rsp_flags;
set_msg_byte(scsi, COMMAND_COMPLETE);
scsi->result |= fcp_rsp->resp.fr_status;
rsp_flags = fcp_rsp->resp.fr_flags;
if (unlikely(rsp_flags & FCP_RSP_LEN_VAL)) {
rsp_info = (struct fcp_resp_rsp_info *) &fcp_rsp[1];
if (rsp_info->rsp_code == FCP_TMF_CMPL)
set_host_byte(scsi, DID_OK);
else {
set_host_byte(scsi, DID_ERROR);
return;
}
}
if (unlikely(rsp_flags & FCP_SNS_LEN_VAL)) {
sense = (char *) &fcp_rsp[1];
if (rsp_flags & FCP_RSP_LEN_VAL)
sense += fcp_rsp->ext.fr_sns_len;
sense_len = min(fcp_rsp->ext.fr_sns_len,
(u32) SCSI_SENSE_BUFFERSIZE);
memcpy(scsi->sense_buffer, sense, sense_len);
}
if (unlikely(rsp_flags & FCP_RESID_UNDER)) {
resid = fcp_rsp->ext.fr_resid;
scsi_set_resid(scsi, resid);
if (scsi_bufflen(scsi) - resid < scsi->underflow &&
!(rsp_flags & FCP_SNS_LEN_VAL) &&
fcp_rsp->resp.fr_status == SAM_STAT_GOOD)
set_host_byte(scsi, DID_ERROR);
}
}
#endif
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