ef3eb71d8b
Introduce support for DIF/DIX in zfcp: Report the capabilities for the Scsi_host, map the protection data when issuing I/O requests and handle the new error codes. Also add the fsf data_direction field to the hba trace, it is useful information for debugging in that area. This is an EXPERIMENTAL feature for now. Signed-off-by: Felix Beck <felix.beck@de.ibm.com> Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
289 lines
8 KiB
C
289 lines
8 KiB
C
/*
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* zfcp device driver
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*
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* Fibre Channel related definitions and inline functions for the zfcp
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* device driver
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*
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* Copyright IBM Corporation 2009
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*/
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#ifndef ZFCP_FC_H
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#define ZFCP_FC_H
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#include <scsi/fc/fc_els.h>
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#include <scsi/fc/fc_fcp.h>
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#include <scsi/fc/fc_ns.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_tcq.h>
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#include "zfcp_fsf.h"
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#define ZFCP_FC_CT_SIZE_PAGE (PAGE_SIZE - sizeof(struct fc_ct_hdr))
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#define ZFCP_FC_GPN_FT_ENT_PAGE (ZFCP_FC_CT_SIZE_PAGE \
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/ sizeof(struct fc_gpn_ft_resp))
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#define ZFCP_FC_GPN_FT_NUM_BUFS 4 /* memory pages */
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#define ZFCP_FC_GPN_FT_MAX_SIZE (ZFCP_FC_GPN_FT_NUM_BUFS * PAGE_SIZE \
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- sizeof(struct fc_ct_hdr))
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#define ZFCP_FC_GPN_FT_MAX_ENT (ZFCP_FC_GPN_FT_NUM_BUFS * \
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(ZFCP_FC_GPN_FT_ENT_PAGE + 1))
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#define ZFCP_FC_CTELS_TMO (2 * FC_DEF_R_A_TOV / 1000)
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/**
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* struct zfcp_fc_event - FC HBAAPI event for internal queueing from irq context
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* @code: Event code
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* @data: Event data
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* @list: list_head for zfcp_fc_events list
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*/
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struct zfcp_fc_event {
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enum fc_host_event_code code;
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u32 data;
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struct list_head list;
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};
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/**
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* struct zfcp_fc_events - Infrastructure for posting FC events from irq context
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* @list: List for queueing of events from irq context to workqueue
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* @list_lock: Lock for event list
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* @work: work_struct for forwarding events in workqueue
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*/
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struct zfcp_fc_events {
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struct list_head list;
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spinlock_t list_lock;
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struct work_struct work;
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};
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/**
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* struct zfcp_fc_gid_pn_req - container for ct header plus gid_pn request
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* @ct_hdr: FC GS common transport header
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* @gid_pn: GID_PN request
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*/
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struct zfcp_fc_gid_pn_req {
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struct fc_ct_hdr ct_hdr;
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struct fc_ns_gid_pn gid_pn;
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} __packed;
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/**
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* struct zfcp_fc_gid_pn_resp - container for ct header plus gid_pn response
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* @ct_hdr: FC GS common transport header
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* @gid_pn: GID_PN response
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*/
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struct zfcp_fc_gid_pn_resp {
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struct fc_ct_hdr ct_hdr;
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struct fc_gid_pn_resp gid_pn;
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} __packed;
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/**
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* struct zfcp_fc_gid_pn - everything required in zfcp for gid_pn request
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* @ct: data passed to zfcp_fsf for issuing fsf request
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* @sg_req: scatterlist entry for request data
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* @sg_resp: scatterlist entry for response data
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* @gid_pn_req: GID_PN request data
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* @gid_pn_resp: GID_PN response data
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*/
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struct zfcp_fc_gid_pn {
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struct zfcp_fsf_ct_els ct;
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struct scatterlist sg_req;
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struct scatterlist sg_resp;
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struct zfcp_fc_gid_pn_req gid_pn_req;
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struct zfcp_fc_gid_pn_resp gid_pn_resp;
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struct zfcp_port *port;
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};
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/**
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* struct zfcp_fc_gpn_ft - container for ct header plus gpn_ft request
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* @ct_hdr: FC GS common transport header
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* @gpn_ft: GPN_FT request
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*/
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struct zfcp_fc_gpn_ft_req {
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struct fc_ct_hdr ct_hdr;
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struct fc_ns_gid_ft gpn_ft;
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} __packed;
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/**
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* struct zfcp_fc_gpn_ft_resp - container for ct header plus gpn_ft response
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* @ct_hdr: FC GS common transport header
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* @gpn_ft: Array of gpn_ft response data to fill one memory page
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*/
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struct zfcp_fc_gpn_ft_resp {
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struct fc_ct_hdr ct_hdr;
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struct fc_gpn_ft_resp gpn_ft[ZFCP_FC_GPN_FT_ENT_PAGE];
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} __packed;
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/**
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* struct zfcp_fc_gpn_ft - zfcp data for gpn_ft request
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* @ct: data passed to zfcp_fsf for issuing fsf request
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* @sg_req: scatter list entry for gpn_ft request
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* @sg_resp: scatter list entries for gpn_ft responses (per memory page)
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*/
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struct zfcp_fc_gpn_ft {
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struct zfcp_fsf_ct_els ct;
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struct scatterlist sg_req;
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struct scatterlist sg_resp[ZFCP_FC_GPN_FT_NUM_BUFS];
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};
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/**
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* struct zfcp_fc_els_adisc - everything required in zfcp for issuing ELS ADISC
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* @els: data required for issuing els fsf command
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* @req: scatterlist entry for ELS ADISC request
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* @resp: scatterlist entry for ELS ADISC response
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* @adisc_req: ELS ADISC request data
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* @adisc_resp: ELS ADISC response data
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*/
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struct zfcp_fc_els_adisc {
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struct zfcp_fsf_ct_els els;
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struct scatterlist req;
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struct scatterlist resp;
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struct fc_els_adisc adisc_req;
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struct fc_els_adisc adisc_resp;
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};
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/**
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* enum zfcp_fc_wka_status - FC WKA port status in zfcp
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* @ZFCP_FC_WKA_PORT_OFFLINE: Port is closed and not in use
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* @ZFCP_FC_WKA_PORT_CLOSING: The FSF "close port" request is pending
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* @ZFCP_FC_WKA_PORT_OPENING: The FSF "open port" request is pending
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* @ZFCP_FC_WKA_PORT_ONLINE: The port is open and the port handle is valid
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*/
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enum zfcp_fc_wka_status {
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ZFCP_FC_WKA_PORT_OFFLINE,
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ZFCP_FC_WKA_PORT_CLOSING,
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ZFCP_FC_WKA_PORT_OPENING,
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ZFCP_FC_WKA_PORT_ONLINE,
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};
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/**
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* struct zfcp_fc_wka_port - representation of well-known-address (WKA) FC port
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* @adapter: Pointer to adapter structure this WKA port belongs to
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* @completion_wq: Wait for completion of open/close command
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* @status: Current status of WKA port
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* @refcount: Reference count to keep port open as long as it is in use
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* @d_id: FC destination id or well-known-address
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* @handle: FSF handle for the open WKA port
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* @mutex: Mutex used during opening/closing state changes
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* @work: For delaying the closing of the WKA port
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*/
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struct zfcp_fc_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_fc_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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/**
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* struct zfcp_fc_wka_ports - Data structures for FC generic services
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* @ms: FC Management service
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* @ts: FC time service
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* @ds: FC directory service
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* @as: FC alias service
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*/
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struct zfcp_fc_wka_ports {
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struct zfcp_fc_wka_port ms;
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struct zfcp_fc_wka_port ts;
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struct zfcp_fc_wka_port ds;
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struct zfcp_fc_wka_port as;
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};
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/**
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* zfcp_fc_scsi_to_fcp - setup FCP command with data from scsi_cmnd
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* @fcp: fcp_cmnd to setup
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* @scsi: scsi_cmnd where to get LUN, task attributes/flags and CDB
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*/
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static inline
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void zfcp_fc_scsi_to_fcp(struct fcp_cmnd *fcp, struct scsi_cmnd *scsi)
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{
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char tag[2];
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int_to_scsilun(scsi->device->lun, (struct scsi_lun *) &fcp->fc_lun);
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if (scsi_populate_tag_msg(scsi, tag)) {
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switch (tag[0]) {
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case MSG_ORDERED_TAG:
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fcp->fc_pri_ta |= FCP_PTA_ORDERED;
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break;
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case MSG_SIMPLE_TAG:
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fcp->fc_pri_ta |= FCP_PTA_SIMPLE;
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break;
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};
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} else
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fcp->fc_pri_ta = FCP_PTA_SIMPLE;
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if (scsi->sc_data_direction == DMA_FROM_DEVICE)
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fcp->fc_flags |= FCP_CFL_RDDATA;
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if (scsi->sc_data_direction == DMA_TO_DEVICE)
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fcp->fc_flags |= FCP_CFL_WRDATA;
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memcpy(fcp->fc_cdb, scsi->cmnd, scsi->cmd_len);
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fcp->fc_dl = scsi_bufflen(scsi);
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if (scsi_get_prot_type(scsi) == SCSI_PROT_DIF_TYPE1)
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fcp->fc_dl += fcp->fc_dl / scsi->device->sector_size * 8;
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}
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/**
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* zfcp_fc_fcp_tm - setup FCP command as task management command
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* @fcp: fcp_cmnd to setup
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* @dev: scsi_device where to send the task management command
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* @tm: task management flags to setup tm command
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*/
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static inline
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void zfcp_fc_fcp_tm(struct fcp_cmnd *fcp, struct scsi_device *dev, u8 tm_flags)
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{
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int_to_scsilun(dev->lun, (struct scsi_lun *) &fcp->fc_lun);
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fcp->fc_tm_flags |= tm_flags;
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}
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/**
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* zfcp_fc_evap_fcp_rsp - evaluate FCP RSP IU and update scsi_cmnd accordingly
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* @fcp_rsp: FCP RSP IU to evaluate
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* @scsi: SCSI command where to update status and sense buffer
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*/
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static inline
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void zfcp_fc_eval_fcp_rsp(struct fcp_resp_with_ext *fcp_rsp,
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struct scsi_cmnd *scsi)
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{
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struct fcp_resp_rsp_info *rsp_info;
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char *sense;
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u32 sense_len, resid;
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u8 rsp_flags;
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set_msg_byte(scsi, COMMAND_COMPLETE);
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scsi->result |= fcp_rsp->resp.fr_status;
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rsp_flags = fcp_rsp->resp.fr_flags;
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if (unlikely(rsp_flags & FCP_RSP_LEN_VAL)) {
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rsp_info = (struct fcp_resp_rsp_info *) &fcp_rsp[1];
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if (rsp_info->rsp_code == FCP_TMF_CMPL)
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set_host_byte(scsi, DID_OK);
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else {
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set_host_byte(scsi, DID_ERROR);
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return;
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}
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}
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if (unlikely(rsp_flags & FCP_SNS_LEN_VAL)) {
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sense = (char *) &fcp_rsp[1];
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if (rsp_flags & FCP_RSP_LEN_VAL)
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sense += fcp_rsp->ext.fr_sns_len;
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sense_len = min(fcp_rsp->ext.fr_sns_len,
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(u32) SCSI_SENSE_BUFFERSIZE);
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memcpy(scsi->sense_buffer, sense, sense_len);
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}
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if (unlikely(rsp_flags & FCP_RESID_UNDER)) {
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resid = fcp_rsp->ext.fr_resid;
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scsi_set_resid(scsi, resid);
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if (scsi_bufflen(scsi) - resid < scsi->underflow &&
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!(rsp_flags & FCP_SNS_LEN_VAL) &&
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fcp_rsp->resp.fr_status == SAM_STAT_GOOD)
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set_host_byte(scsi, DID_ERROR);
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}
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}
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#endif
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