[SCSI] lpfc 8.3.4: Add bsg (SGIOv4) support for ELS/CT support

Add bsg (SGIOv4) support for sending and receiving ELS, CT commands

This patch adds a new file, lpfc_bsg.c.
Signed-off-by: James Smart <James.Smart@emulex.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

drivers/scsi/lpfc/Makefile

@@ -28,4 +28,4 @@ obj-$(CONFIG_SCSI_LPFC) := lpfc.o
 
 lpfc-objs := lpfc_mem.o lpfc_sli.o lpfc_ct.o lpfc_els.o lpfc_hbadisc.o	\
 	lpfc_init.o lpfc_mbox.o lpfc_nportdisc.o lpfc_scsi.o lpfc_attr.o \
-	lpfc_vport.o lpfc_debugfs.o
+	lpfc_vport.o lpfc_debugfs.o lpfc_bsg.o

drivers/scsi/lpfc/lpfc.h

@@ -441,6 +441,12 @@ enum intr_type_t {
 	MSIX,
 };
 
+struct unsol_rcv_ct_ctx {
+	uint32_t ctxt_id;
+	uint32_t SID;
+	uint32_t oxid;
+};
+
 struct lpfc_hba {
 	/* SCSI interface function jump table entries */
 	int (*lpfc_new_scsi_buf)
@@ -776,6 +782,11 @@ struct lpfc_hba {
 	uint8_t valid_vlan;
 	uint16_t vlan_id;
 	struct list_head fcf_conn_rec_list;
+
+	struct mutex ct_event_mutex; /* synchronize access to ct_ev_waiters */
+	struct list_head ct_ev_waiters;
+	struct unsol_rcv_ct_ctx ct_ctx[64];
+	uint32_t ctx_idx;
 };
 
 static inline struct Scsi_Host *

drivers/scsi/lpfc/lpfc_attr.c

@@ -4132,6 +4132,9 @@ struct fc_function_template lpfc_transport_functions = {
 	.vport_disable = lpfc_vport_disable,
 
 	.set_vport_symbolic_name = lpfc_set_vport_symbolic_name,
+
+	.bsg_request = lpfc_bsg_request,
+	.bsg_timeout = lpfc_bsg_timeout,
 };
 
 struct fc_function_template lpfc_vport_transport_functions = {

drivers/scsi/lpfc/lpfc_crtn.h

@@ -137,6 +137,9 @@ int lpfc_els_disc_adisc(struct lpfc_vport *);
 int lpfc_els_disc_plogi(struct lpfc_vport *);
 void lpfc_els_timeout(unsigned long);
 void lpfc_els_timeout_handler(struct lpfc_vport *);
+struct lpfc_iocbq *lpfc_prep_els_iocb(struct lpfc_vport *, uint8_t, uint16_t,
+				      uint8_t, struct lpfc_nodelist *,
+				      uint32_t, uint32_t);
 void lpfc_hb_timeout_handler(struct lpfc_hba *);
 
 void lpfc_ct_unsol_event(struct lpfc_hba *, struct lpfc_sli_ring *,
@@ -364,3 +367,8 @@ void lpfc_start_fdiscs(struct lpfc_hba *phba);
 #define HBA_EVENT_LINK_UP                2
 #define HBA_EVENT_LINK_DOWN              3
 
+/* functions to support SGIOv4/bsg interface */
+int lpfc_bsg_request(struct fc_bsg_job *);
+int lpfc_bsg_timeout(struct fc_bsg_job *);
+void lpfc_bsg_ct_unsol_event(struct lpfc_hba *, struct lpfc_sli_ring *,
+			     struct lpfc_iocbq *);

drivers/scsi/lpfc/lpfc_ct.c

@@ -97,6 +97,8 @@ lpfc_ct_unsol_event(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
 	struct list_head head;
 	struct lpfc_dmabuf *bdeBuf;
 
+	lpfc_bsg_ct_unsol_event(phba, pring, piocbq);
+
 	if (unlikely(icmd->ulpStatus == IOSTAT_NEED_BUFFER)) {
 		lpfc_sli_hbqbuf_add_hbqs(phba, LPFC_ELS_HBQ);
 	} else if ((icmd->ulpStatus == IOSTAT_LOCAL_REJECT) &&

drivers/scsi/lpfc/lpfc_els.c

@@ -146,7 +146,7 @@ lpfc_els_chk_latt(struct lpfc_vport *vport)
  *   Pointer to the newly allocated/prepared els iocb data structure
  *   NULL - when els iocb data structure allocation/preparation failed
  **/
-static struct lpfc_iocbq *
+struct lpfc_iocbq *
 lpfc_prep_els_iocb(struct lpfc_vport *vport, uint8_t expectRsp,
 		   uint16_t cmdSize, uint8_t retry,
 		   struct lpfc_nodelist *ndlp, uint32_t did,

drivers/scsi/lpfc/lpfc_init.c

@@ -4171,6 +4171,9 @@ lpfc_hba_alloc(struct pci_dev *pdev)
 		return NULL;
 	}
 
+	mutex_init(&phba->ct_event_mutex);
+	INIT_LIST_HEAD(&phba->ct_ev_waiters);
+
 	return phba;
 }
 

drivers/scsi/lpfc/lpfc_nl.h

@@ -177,3 +177,23 @@ struct temp_event {
 	uint32_t data;
 };
 
+/* bsg definitions */
+#define LPFC_BSG_VENDOR_SET_CT_EVENT	1
+#define LPFC_BSG_VENDOR_GET_CT_EVENT	2
+
+struct set_ct_event {
+	uint32_t command;
+	uint32_t ev_req_id;
+	uint32_t ev_reg_id;
+};
+
+struct get_ct_event {
+	uint32_t command;
+	uint32_t ev_reg_id;
+	uint32_t ev_req_id;
+};
+
+struct get_ct_event_reply {
+	uint32_t immed_data;
+	uint32_t type;
+};

drivers/scsi/lpfc/lpfc_scsi.c

@@ -3584,6 +3584,7 @@ struct scsi_host_template lpfc_template = {
 	.use_clustering		= ENABLE_CLUSTERING,
 	.shost_attrs		= lpfc_hba_attrs,
 	.max_sectors		= 0xFFFF,
+	.vendor_id		= LPFC_NL_VENDOR_ID,
 };
 
 struct scsi_host_template lpfc_vport_template = {