[SCSI] zfcp: Simplify handling of ct and els requests

Remove some redundancies in FC related code and trace:
- drop redundant data from SAN trace (local s_id that only changes
  during link down, ls_code that is already part of payload, d_id in
  ct response trace that is always the same as in ct request trace)
- use one common fsf struct to hold zfcp data for ct and els requests
- leverage common fsf struct for FC passthrough job data, allocate it
  with dd_bsg_data for passthrough requests and unify common code for
  ct and els passthrough request
- simplify callback handling in zfcp_fc

Reviewed-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

drivers/s390/scsi/zfcp_ext.h

@@ -12,6 +12,7 @@
 #include <linux/types.h>
 #include <scsi/fc/fc_els.h>
 #include "zfcp_def.h"
+#include "zfcp_fc.h"
 
 /* zfcp_aux.c */
 extern struct zfcp_unit *zfcp_get_unit_by_lun(struct zfcp_port *, u64);
@@ -55,7 +56,7 @@ extern void _zfcp_dbf_hba_fsf_unsol(const char *, int level, struct zfcp_dbf *,
 					  struct fsf_status_read_buffer *);
 extern void zfcp_dbf_hba_qdio(struct zfcp_dbf *, unsigned int, int, int);
 extern void zfcp_dbf_hba_berr(struct zfcp_dbf *, struct zfcp_fsf_req *);
-extern void zfcp_dbf_san_ct_request(struct zfcp_fsf_req *);
+extern void zfcp_dbf_san_ct_request(struct zfcp_fsf_req *, u32);
 extern void zfcp_dbf_san_ct_response(struct zfcp_fsf_req *);
 extern void zfcp_dbf_san_els_request(struct zfcp_fsf_req *);
 extern void zfcp_dbf_san_els_response(struct zfcp_fsf_req *);
@@ -106,8 +107,7 @@ extern void zfcp_fc_link_test_work(struct work_struct *);
 extern void zfcp_fc_wka_ports_force_offline(struct zfcp_fc_wka_ports *);
 extern int zfcp_fc_gs_setup(struct zfcp_adapter *);
 extern void zfcp_fc_gs_destroy(struct zfcp_adapter *);
-extern int zfcp_fc_execute_els_fc_job(struct fc_bsg_job *);
-extern int zfcp_fc_execute_ct_fc_job(struct fc_bsg_job *);
+extern int zfcp_fc_exec_bsg_job(struct fc_bsg_job *);
 
 /* zfcp_fsf.c */
 extern int zfcp_fsf_open_port(struct zfcp_erp_action *);
@@ -128,8 +128,10 @@ extern struct zfcp_fsf_req *zfcp_fsf_control_file(struct zfcp_adapter *,
 extern void zfcp_fsf_req_dismiss_all(struct zfcp_adapter *);
 extern int zfcp_fsf_status_read(struct zfcp_qdio *);
 extern int zfcp_status_read_refill(struct zfcp_adapter *adapter);
-extern int zfcp_fsf_send_ct(struct zfcp_send_ct *, mempool_t *);
-extern int zfcp_fsf_send_els(struct zfcp_send_els *);
+extern int zfcp_fsf_send_ct(struct zfcp_fc_wka_port *, struct zfcp_fsf_ct_els *,
+			    mempool_t *);
+extern int zfcp_fsf_send_els(struct zfcp_adapter *, u32,
+			     struct zfcp_fsf_ct_els *);
 extern int zfcp_fsf_send_fcp_command_task(struct zfcp_unit *,
 					  struct scsi_cmnd *);
 extern void zfcp_fsf_req_free(struct zfcp_fsf_req *);