[SCSI] bfa: Add BSG interface to support ELS, CT and vendor commands.

- Added BSG interface support to BFA driver
- Adds support to send ELS/CT FC passthru commands and
  few vendor specific BSG requests.

Signed-off-by: Krishna Gudipati <kgudipat@brocade.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

drivers/scsi/bfa/Makefile

@@ -1,6 +1,6 @@
 obj-$(CONFIG_SCSI_BFA_FC) := bfa.o
 
-bfa-y := bfad.o bfad_im.o bfad_attr.o bfad_debugfs.o
+bfa-y := bfad.o bfad_im.o bfad_attr.o bfad_debugfs.o bfad_bsg.o
 bfa-y += bfa_ioc.o bfa_ioc_cb.o bfa_ioc_ct.o bfa_hw_cb.o bfa_hw_ct.o
 bfa-y += bfa_fcs.o bfa_fcs_lport.o bfa_fcs_rport.o bfa_fcs_fcpim.o bfa_fcbuild.o
 bfa-y += bfa_port.o bfa_fcpim.o bfa_core.o bfa_svc.o

drivers/scsi/bfa/bfa_defs.h

@@ -130,6 +130,7 @@ enum bfa_status {
 	BFA_STATUS_ETIMER	= 5,	/*  Timer expired - Retry, if persists,
 					 *  contact support */
 	BFA_STATUS_EPROTOCOL	= 6,	/*  Protocol error */
+	BFA_STATUS_UNKNOWN_VFID = 11,	/*  VF_ID not found */
 	BFA_STATUS_DEVBUSY	= 13,	/*  Device busy - Retry operation */
 	BFA_STATUS_UNKNOWN_LWWN = 18,	/*  LPORT PWWN not found */
 	BFA_STATUS_UNKNOWN_RWWN = 19,	/*  RPORT PWWN not found */
@@ -138,11 +139,13 @@ enum bfa_status {
 	BFA_STATUS_UNSUPP_SPEED	= 23,	/*  Invalid Speed Check speed setting */
 	BFA_STATUS_INVLD_DFSZ	= 24,	/*  Invalid Max data field size */
 	BFA_STATUS_FABRIC_RJT	= 29,	/*  Reject from attached fabric */
+	BFA_STATUS_PORT_OFFLINE = 34,	/*  Port is not online */
 	BFA_STATUS_VPORT_WWN_BP	= 46,	/*  WWN is same as base port's WWN */
 	BFA_STATUS_NO_FCPIM_NEXUS = 52,	/* No FCP Nexus exists with the rport */
 	BFA_STATUS_IOC_FAILURE	= 56,	/* IOC failure - Retry, if persists
 					 * contact support */
 	BFA_STATUS_INVALID_WWN	= 57,	/*  Invalid WWN */
+	BFA_STATUS_VERSION_FAIL = 70, /* Application/Driver version mismatch */
 	BFA_STATUS_DIAG_BUSY	= 71,	/*  diag busy */
 	BFA_STATUS_ENOFSAVE	= 78,	/*  No saved firmware trace */
 	BFA_STATUS_IOC_DISABLED = 82,   /* IOC is already disabled */

drivers/scsi/bfa/bfa_fcs.c

@@ -1369,6 +1369,45 @@ bfa_fcs_vf_lookup(struct bfa_fcs_s *fcs, u16 vf_id)
 	return NULL;
 }
 
+/*
+ *	Return the list of local logical ports present in the given VF.
+ *
+ *	@param[in]	vf	vf for which logical ports are returned
+ *	@param[out]	lpwwn	returned logical port wwn list
+ *	@param[in,out]	nlports in:size of lpwwn list;
+ *				out:total elements present,
+ *				actual elements returned is limited by the size
+ */
+void
+bfa_fcs_vf_get_ports(bfa_fcs_vf_t *vf, wwn_t lpwwn[], int *nlports)
+{
+	struct list_head *qe;
+	struct bfa_fcs_vport_s *vport;
+	int	i = 0;
+	struct bfa_fcs_s	*fcs;
+
+	if (vf == NULL || lpwwn == NULL || *nlports == 0)
+		return;
+
+	fcs = vf->fcs;
+
+	bfa_trc(fcs, vf->vf_id);
+	bfa_trc(fcs, (uint32_t) *nlports);
+
+	lpwwn[i++] = vf->bport.port_cfg.pwwn;
+
+	list_for_each(qe, &vf->vport_q) {
+		if (i >= *nlports)
+			break;
+
+		vport = (struct bfa_fcs_vport_s *) qe;
+		lpwwn[i++] = vport->lport.port_cfg.pwwn;
+	}
+
+	bfa_trc(fcs, i);
+	*nlports = i;
+}
+
 /*
  * BFA FCS PPORT ( physical port)
  */

drivers/scsi/bfa/bfa_fcs.h

@@ -731,6 +731,7 @@ void bfa_fcs_exit(struct bfa_fcs_s *fcs);
  * bfa fcs vf public functions
  */
 bfa_fcs_vf_t *bfa_fcs_vf_lookup(struct bfa_fcs_s *fcs, u16 vf_id);
+void bfa_fcs_vf_get_ports(bfa_fcs_vf_t *vf, wwn_t vpwwn[], int *nports);
 
 /*
  * fabric protected interface functions

drivers/scsi/bfa/bfad_attr.c

@@ -583,6 +583,8 @@ struct fc_function_template bfad_im_fc_function_template = {
 	.vport_create = bfad_im_vport_create,
 	.vport_delete = bfad_im_vport_delete,
 	.vport_disable = bfad_im_vport_disable,
+	.bsg_request = bfad_im_bsg_request,
+	.bsg_timeout = bfad_im_bsg_timeout,
 };
 
 struct fc_function_template bfad_im_vport_fc_function_template = {