[PATCH 03/29] ibmvfc: split NVMe support into separate source file and add transport stubs

[Tyrel Datwyler <tyreld@linux.ibm.com>]

Rename ibmvfc.c to ibmvfc-core.c as first step in decoupling each
protocol from the core driver logic. Add ibmvfc-nvme.[ch] files, and
register an nvme_fc_port_template with empty callback stubs.

Add empty registration functions definitions for local and remote ports.

No functional NVMe/FC support is added yet.

Signed-off-by: Tyrel Datwyler <tyreld@linux.ibm.com>
---
 drivers/scsi/ibmvscsi/Makefile                |  2 +
 .../scsi/ibmvscsi/{ibmvfc.c => ibmvfc-core.c} | 19 +++-
 drivers/scsi/ibmvscsi/ibmvfc-nvme.c           | 87 +++++++++++++++++++
 drivers/scsi/ibmvscsi/ibmvfc-nvme.h           | 32 +++++++
 drivers/scsi/ibmvscsi/ibmvfc.h                | 10 ++-
 5 files changed, 146 insertions(+), 4 deletions(-)
 rename drivers/scsi/ibmvscsi/{ibmvfc.c => ibmvfc-core.c} (99%)
 create mode 100644 drivers/scsi/ibmvscsi/ibmvfc-nvme.c
 create mode 100644 drivers/scsi/ibmvscsi/ibmvfc-nvme.h

diff --git a/drivers/scsi/ibmvscsi/Makefile b/drivers/scsi/ibmvscsi/Makefile
index 5eb1cb1a0028..9408c7f4cdee 100644
--- a/drivers/scsi/ibmvscsi/Makefile
+++ b/drivers/scsi/ibmvscsi/Makefile
@@ -1,3 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0-only
+ibmvfc-objs := ibmvfc-core.o ibmvfc-nvme.o
+
 obj-$(CONFIG_SCSI_IBMVSCSI)	+= ibmvscsi.o
 obj-$(CONFIG_SCSI_IBMVFC)	+= ibmvfc.o
diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc-core.c
similarity index 99%
rename from drivers/scsi/ibmvscsi/ibmvfc.c
rename to drivers/scsi/ibmvscsi/ibmvfc-core.c
index 912901436442..4e45d23221d6 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc.c
+++ b/drivers/scsi/ibmvscsi/ibmvfc-core.c
@@ -1,10 +1,11 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
 /*
  * ibmvfc.c -- driver for IBM Power Virtual Fibre Channel Adapter
  *
  * Written By: Brian King <brking@linux.vnet.ibm.com>, IBM Corporation
  *
- * Copyright (C) IBM Corporation, 2008
+ * Copyright (C) IBM Corporation, 2008-2026
  */
 
 #include <linux/module.h>
@@ -46,6 +47,9 @@ static unsigned int cls3_error = IBMVFC_CLS3_ERROR;
 static unsigned int mq_enabled = IBMVFC_MQ;
 static unsigned int nr_scsi_hw_queues = IBMVFC_SCSI_HW_QUEUES;
 static unsigned int nr_scsi_channels = IBMVFC_SCSI_CHANNELS;
+static unsigned int nvme_enabled = IBMVFC_NVME;
+static unsigned int nr_nvme_hw_queues = IBMVFC_NVME_HW_QUEUES;
+static unsigned int nr_nvme_channels = IBMVFC_NVME_CHANNELS;
 static unsigned int mig_channels_only = IBMVFC_MIG_NO_SUB_TO_CRQ;
 static unsigned int mig_no_less_channels = IBMVFC_MIG_NO_N_TO_M;
 
@@ -74,6 +78,16 @@ module_param_named(mig_no_less_channels, mig_no_less_channels, uint, S_IRUGO);
 MODULE_PARM_DESC(mig_no_less_channels, "Prevent migration to system with less channels. "
 		 "[Default=" __stringify(IBMVFC_MIG_NO_N_TO_M) "]");
 
+module_param_named(nvme, nvme_enabled, uint, S_IRUGO);
+MODULE_PARM_DESC(nvme, "Enable NVMe over FC support. "
+		 "[Default=" __stringify(IBMVFC_NVME) "]");
+module_param_named(nvme_host_queues, nr_nvme_hw_queues, uint, S_IRUGO);
+MODULE_PARM_DESC(nvme_host_queues, "Number of NVMeoF Host submission queues. "
+		 "[Default=" __stringify(IBMVFC_NVME_HW_QUEUES) "]");
+module_param_named(nvme_hw_channels, nr_nvme_channels, uint, S_IRUGO);
+MODULE_PARM_DESC(nvme_hw_channels, "Number of hw NVMeoF channels to request. "
+		 "[Default=" __stringify(IBMVFC_NVME_CHANNELS) "]");
+
 module_param_named(init_timeout, init_timeout, uint, S_IRUGO | S_IWUSR);
 MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds. "
 		 "[Default=" __stringify(IBMVFC_INIT_TIMEOUT) "]");
@@ -468,6 +482,7 @@ static const struct {
 	{ IBMVFC_FABRIC_BUSY, "fabric busy" },
 	{ IBMVFC_PORT_BUSY, "port busy" },
 	{ IBMVFC_BASIC_REJECT, "basic reject" },
+	{ IBMVFC_FC4_LS_REJECT, "fc4 ls reject" },
 };
 
 static const char *unknown_fc_type = "unknown fc type";
diff --git a/drivers/scsi/ibmvscsi/ibmvfc-nvme.c b/drivers/scsi/ibmvscsi/ibmvfc-nvme.c
new file mode 100644
index 000000000000..4a66cde8a8d2
--- /dev/null
+++ b/drivers/scsi/ibmvscsi/ibmvfc-nvme.c
@@ -0,0 +1,87 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+/*
+ * ibmvfc-nvme.c -- IBM Power Virtual Fibre Channel NVMeoF HBA driver
+ *
+ * Written By: Tyrel Datwyler <tyreld@linux.ibm.com>, IBM Corporation
+ *
+ * Copyright (C) IBM Corporation, 2026
+ */
+
+#include <scsi/scsi_transport_fc.h>
+
+#include "ibmvfc-nvme.h"
+
+static void ibmvfc_nvme_localport_delete(struct nvme_fc_local_port *lport)
+{
+}
+
+static void ibmvfc_nvme_remoteport_delete(struct nvme_fc_remote_port *rport)
+{
+}
+
+static int ibmvfc_nvme_ls_req(struct nvme_fc_local_port *lport,
+			      struct nvme_fc_remote_port *rport,
+			      struct nvmefc_ls_req *ls_req)
+{
+	return 0;
+}
+
+static void ibmvfc_nvme_ls_abort(struct nvme_fc_local_port *lport,
+				struct nvme_fc_remote_port *rport,
+				struct nvmefc_ls_req *ls_abort)
+{
+}
+
+static int ibmvfc_nvme_fcp_io(struct nvme_fc_local_port *lport,
+			      struct nvme_fc_remote_port *rport,
+			      void *hw_queue_handle,
+			      struct nvmefc_fcp_req *fcp_req)
+{
+	return 0;
+}
+
+static void ibmvfc_nvme_fcp_abort(struct nvme_fc_local_port *lport,
+				  struct nvme_fc_remote_port *rport,
+				  void *hw_queue_handle,
+				  struct nvmefc_fcp_req *abort_req)
+{
+}
+
+static struct nvme_fc_port_template ibmvfc_nvme_fc_transport = {
+	.localport_delete	= ibmvfc_nvme_localport_delete,
+	.remoteport_delete	= ibmvfc_nvme_remoteport_delete,
+	.create_queue		= NULL,
+	.delete_queue		= NULL,
+	.ls_req			= ibmvfc_nvme_ls_req,
+	.ls_abort		= ibmvfc_nvme_ls_abort,
+	.fcp_io			= ibmvfc_nvme_fcp_io,
+	.fcp_abort		= ibmvfc_nvme_fcp_abort,
+	.map_queues		= NULL,
+	.max_hw_queues		= IBMVFC_NVME_HW_QUEUES,
+	.max_sgl_segments	= 1024,
+	.max_dif_sgl_segments	= 64,
+	.dma_boundary		= 0xFFFFFFFF,
+	.local_priv_sz		= sizeof(struct ibmvfc_host *),
+	.remote_priv_sz		= sizeof(struct ibmvfc_target *),
+	.lsrqst_priv_sz		= sizeof(struct ibmvfc_event *),
+	.fcprqst_priv_sz	= sizeof(struct ibmvfc_event *),
+};
+
+int ibmvfc_nvme_register_remoteport(struct ibmvfc_target *tgt)
+{
+	return 0;
+}
+
+void ibmvfc_nvme_unregister_remoteport(struct ibmvfc_target *tgt)
+{
+}
+
+int ibmvfc_nvme_register(struct ibmvfc_host *vhost)
+{
+	return 0;
+}
+
+void ibmvfc_nvme_unregister(struct ibmvfc_host *vhost)
+{
+}
diff --git a/drivers/scsi/ibmvscsi/ibmvfc-nvme.h b/drivers/scsi/ibmvscsi/ibmvfc-nvme.h
new file mode 100644
index 000000000000..97e267871df2
--- /dev/null
+++ b/drivers/scsi/ibmvscsi/ibmvfc-nvme.h
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+/*
+ * ibmvfc-nvme.h -- IBM Power Virtual Fibre Channel NVMeoF HBA driver
+ *
+ * Written By: Tyrel Datwyler <tyreld@linux.ibm.com>, IBM Corporation
+ *
+ * Copyright (C) IBM Corporation, 2026
+ */
+
+#ifndef _IBMVFC_NVME_H
+#define _IBMVFC_NVME_H
+
+#include <uapi/scsi/fc/fc_fs.h>
+#include <uapi/scsi/fc/fc_els.h>
+#include <linux/nvme-fc-driver.h>
+
+#include "ibmvfc.h"
+
+#define IBMVFC_NVME		0
+#define IBMVFC_NVME_HW_QUEUES	8
+#define IBMVFC_MAX_NVME_QUEUES	16
+#define IBMVFC_NVME_CHANNELS	8
+
+struct ibmvfc_host;
+struct ibmvfc_target;
+
+int ibmvfc_nvme_register_remoteport(struct ibmvfc_target *tgt);
+void ibmvfc_nvme_unregister_remoteport(struct ibmvfc_target *tgt);
+int ibmvfc_nvme_register(struct ibmvfc_host *vhost);
+void ibmvfc_nvme_unregister(struct ibmvfc_host *vhost);
+#endif
diff --git a/drivers/scsi/ibmvscsi/ibmvfc.h b/drivers/scsi/ibmvscsi/ibmvfc.h
index f8a2bf92da41..f137b61ce422 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc.h
+++ b/drivers/scsi/ibmvscsi/ibmvfc.h
@@ -1,22 +1,27 @@
 /* SPDX-License-Identifier: GPL-2.0-or-later */
+
 /*
  * ibmvfc.h -- driver for IBM Power Virtual Fibre Channel Adapter
  *
  * Written By: Brian King <brking@linux.vnet.ibm.com>, IBM Corporation
  *
- * Copyright (C) IBM Corporation, 2008
+ * Copyright (C) IBM Corporation, 2008-2026
  */
 
 #ifndef _IBMVFC_H
 #define _IBMVFC_H
 
+#include <linux/interrupt.h>
 #include <linux/list.h>
 #include <linux/types.h>
+#include <scsi/scsi_device.h>
 #include <scsi/viosrp.h>
 #include <linux/nvme.h>
 #include <linux/nvme-fc.h>
 
-#define IBMVFC_NAME	"ibmvfc"
+#include "ibmvfc-nvme.h"
+
+#define IBMVFC_NAME			"ibmvfc"
 #define IBMVFC_DRIVER_VERSION		"1.0.11"
 #define IBMVFC_DRIVER_DATE		"(April 12, 2013)"
 
@@ -984,6 +989,7 @@ struct ibmvfc_host {
 	unsigned int mq_enabled:1;
 	unsigned int using_channels:1;
 	unsigned int do_enquiry:1;
+	unsigned int nvme_enabled:1;
 	unsigned int aborting_passthru:1;
 	unsigned int scan_complete:1;
 	int scan_timeout;
-- 
2.54.0