drivers/s390/scsi/zfcp_fc.h - maze/linux - Git at Google

 /*
  * 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_event - FC HBAAPI event for internal queueing from irq context
  * @code: Event code
  * @data: Event data
  * @list: list_head for zfcp_fc_events list
  */
 struct zfcp_fc_event {
 	enum fc_host_event_code code;
 	u32 data;
 	struct list_head list;
 };

 /**
  * struct zfcp_fc_events - Infrastructure for posting FC events from irq context
  * @list: List for queueing of events from irq context to workqueue
  * @list_lock: Lock for event list
  * @work: work_struct for forwarding events in workqueue
 */
 struct zfcp_fc_events {
 	struct list_head list;
 	spinlock_t list_lock;
 	struct work_struct work;
 };

 /**
  * 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);

 	if (scsi_get_prot_type(scsi) == SCSI_PROT_DIF_TYPE1)
 		fcp->fc_dl += fcp->fc_dl / scsi->device->sector_size * 8;
 }

 /**
  * 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_rsp_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
	/*
	* 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_event - FC HBAAPI event for internal queueing from irq context
	* @code: Event code
	* @data: Event data
	* @list: list_head for zfcp_fc_events list
	*/
	struct zfcp_fc_event {
	enum fc_host_event_code code;
	u32 data;
	struct list_head list;
	};

	/**
	* struct zfcp_fc_events - Infrastructure for posting FC events from irq context
	* @list: List for queueing of events from irq context to workqueue
	* @list_lock: Lock for event list
	* @work: work_struct for forwarding events in workqueue
	*/
	struct zfcp_fc_events {
	struct list_head list;
	spinlock_t list_lock;
	struct work_struct work;
	};

	/**
	* 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);

	if (scsi_get_prot_type(scsi) == SCSI_PROT_DIF_TYPE1)
	fcp->fc_dl += fcp->fc_dl / scsi->device->sector_size * 8;
	}

	/**
	* 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_rsp_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