[PATCHv2 1/1] ibmvfc: IBM Power Virtual Fibre Channel Adapter Client Driver

[Brian King <brking@xxxxxxxxxxxxxxxxxx>]

This patch adds a new device driver to support the Virtual Fibre Channel
interface on IBM Power based servers. The Virtual I/O Server on IBM Power
servers utilizes N-Port ID Virtualization to export a Virtual Fibre Channel
adapter to the client. This driver is the client device driver.

Signed-off-by: Brian King <brking@xxxxxxxxxxxxxxxxxx>
---

Changes since last post:

1. Changed host init retry logic. If NPIV Login or Discover Targets is failing,
   on the final retry, break the CRQ for a full reset of the interface before
   giving up.
2. Made disc_threads module parameter writable
3. Added a wrapper function to wait for an adapter reset to complete and fix
   a couple bugs related to waiting for adapter reset completion
4. Change a kzalloc to a kcalloc

Bugs Fixed:

1. Fixed end driver trace point
2. Change to return DID_REQUEUE when host state is IBMVFC_NO_CRQ
3. Fixed some abort and reset command setup and response handling problems
4. Several other small bugs
5. Fixed build problem so that driver can be compiled into the kernel
---

 drivers/scsi/Kconfig           |   19 
 drivers/scsi/Makefile          |    1 
 drivers/scsi/ibmvscsi/Makefile |    1 
 drivers/scsi/ibmvscsi/ibmvfc.c | 3906 +++++++++++++++++++++++++++++++++++++++++
 drivers/scsi/ibmvscsi/ibmvfc.h |  682 +++++++
 5 files changed, 4609 insertions(+)

diff -puN /dev/null drivers/scsi/ibmvscsi/ibmvfc.h
--- /dev/null	2006-11-25 06:17:37.000000000 -0600
+++ linux-2.6-bjking1/drivers/scsi/ibmvscsi/ibmvfc.h	2008-06-24 13:01:47.000000000 -0500
@@ -0,0 +1,682 @@
+/*
+ * ibmvfc.h -- driver for IBM Power Virtual Fibre Channel Adapter
+ *
+ * Written By: Brian King <brking@xxxxxxxxxxxxxxxxxx>, IBM Corporation
+ *
+ * Copyright (C) IBM Corporation, 2008
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#ifndef _IBMVFC_H
+#define _IBMVFC_H
+
+#include <linux/list.h>
+#include <linux/types.h>
+#include "viosrp.h"
+
+#define IBMVFC_NAME	"ibmvfc"
+#define IBMVFC_DRIVER_VERSION		"1.0.0"
+#define IBMVFC_DRIVER_DATE		"(June 24, 2008)"
+
+#define IBMVFC_DEFAULT_TIMEOUT	15
+#define IBMVFC_INIT_TIMEOUT		30
+#define IBMVFC_MAX_REQUESTS_DEFAULT	100
+
+#define IBMVFC_DEBUG			0
+#define IBMVFC_MAX_TARGETS		1024
+#define IBMVFC_MAX_LUN			0xffffffff
+#define IBMVFC_MAX_SECTORS		0xffffu
+#define IBMVFC_MAX_DISC_THREADS	4
+#define IBMVFC_TGT_MEMPOOL_SZ		64
+#define IBMVFC_MAX_CMDS_PER_LUN	64
+#define IBMVFC_MAX_INIT_RETRIES	3
+#define IBMVFC_DEV_LOSS_TMO		(5 * 60)
+#define IBMVFC_DEFAULT_LOG_LEVEL	2
+#define IBMVFC_MAX_CDB_LEN		16
+
+/*
+ * Ensure we have resources for ERP and initialization:
+ * 1 for ERP
+ * 1 for initialization
+ * 1 for each discovery thread
+ */
+#define IBMVFC_NUM_INTERNAL_REQ	(1 + 1 + disc_threads)
+
+#define IBMVFC_MAD_SUCCESS		0x00
+#define IBMVFC_MAD_NOT_SUPPORTED	0xF1
+#define IBMVFC_MAD_FAILED		0xF7
+#define IBMVFC_MAD_DRIVER_FAILED	0xEE
+#define IBMVFC_MAD_CRQ_ERROR		0xEF
+
+enum ibmvfc_crq_valid {
+	IBMVFC_CRQ_CMD_RSP		= 0x80,
+	IBMVFC_CRQ_INIT_RSP		= 0xC0,
+	IBMVFC_CRQ_XPORT_EVENT		= 0xFF,
+};
+
+enum ibmvfc_crq_format {
+	IBMVFC_CRQ_INIT			= 0x01,
+	IBMVFC_CRQ_INIT_COMPLETE	= 0x02,
+	IBMVFC_PARTITION_MIGRATED	= 0x06,
+};
+
+enum ibmvfc_cmd_status_flags {
+	IBMVFC_FABRIC_MAPPED		= 0x0001,
+	IBMVFC_VIOS_FAILURE		= 0x0002,
+	IBMVFC_FC_FAILURE			= 0x0004,
+	IBMVFC_FC_SCSI_ERROR		= 0x0008,
+	IBMVFC_HW_EVENT_LOGGED		= 0x0010,
+	IBMVFC_VIOS_LOGGED		= 0x0020,
+};
+
+enum ibmvfc_fabric_mapped_errors {
+	IBMVFC_UNABLE_TO_ESTABLISH	= 0x0001,
+	IBMVFC_XPORT_FAULT		= 0x0002,
+	IBMVFC_CMD_TIMEOUT		= 0x0003,
+	IBMVFC_ENETDOWN			= 0x0004,
+	IBMVFC_HW_FAILURE			= 0x0005,
+	IBMVFC_LINK_DOWN_ERR		= 0x0006,
+	IBMVFC_LINK_DEAD_ERR		= 0x0007,
+	IBMVFC_UNABLE_TO_REGISTER	= 0x0008,
+	IBMVFC_XPORT_BUSY			= 0x000A,
+	IBMVFC_XPORT_DEAD			= 0x000B,
+	IBMVFC_CONFIG_ERROR		= 0x000C,
+	IBMVFC_NAME_SERVER_FAIL		= 0x000D,
+	IBMVFC_LINK_HALTED		= 0x000E,
+	IBMVFC_XPORT_GENERAL		= 0x8000,
+};
+
+enum ibmvfc_vios_errors {
+	IBMVFC_CRQ_FAILURE			= 0x0001,
+	IBMVFC_SW_FAILURE				= 0x0002,
+	IBMVFC_INVALID_PARAMETER		= 0x0003,
+	IBMVFC_MISSING_PARAMETER		= 0x0004,
+	IBMVFC_HOST_IO_BUS			= 0x0005,
+	IBMVFC_TRANS_CANCELLED			= 0x0006,
+	IBMVFC_TRANS_CANCELLED_IMPLICIT	= 0x0007,
+	IBMVFC_INSUFFICIENT_RESOURCE		= 0x0008,
+	IBMVFC_COMMAND_FAILED			= 0x8000,
+};
+
+enum ibmvfc_mad_types {
+	IBMVFC_NPIV_LOGIN		= 0x0001,
+	IBMVFC_DISC_TARGETS	= 0x0002,
+	IBMVFC_PORT_LOGIN		= 0x0004,
+	IBMVFC_PROCESS_LOGIN	= 0x0008,
+	IBMVFC_QUERY_TARGET	= 0x0010,
+	IBMVFC_IMPLICIT_LOGOUT	= 0x0040,
+	IBMVFC_TMF_MAD		= 0x0100,
+};
+
+struct ibmvfc_mad_common {
+	u32 version;
+	u32 reserved;
+	u32 opcode;
+	u16 status;
+	u16 length;
+	u64 tag;
+}__attribute__((packed, aligned (8)));
+
+struct ibmvfc_npiv_login_mad {
+	struct ibmvfc_mad_common common;
+	struct srp_direct_buf buffer;
+}__attribute__((packed, aligned (8)));
+
+#define IBMVFC_MAX_NAME 256
+
+struct ibmvfc_npiv_login {
+	u32 ostype;
+#define IBMVFC_OS_LINUX	0x02
+	u32 pad;
+	u64 max_dma_len;
+	u32 max_payload;
+	u32 max_response;
+	u32 partition_num;
+	u32 vfc_frame_version;
+	u16 fcp_version;
+	u16 flags;
+#define IBMVFC_CLIENT_MIGRATED	0x01
+#define IBMVFC_FLUSH_ON_HALT		0x02
+	u32 max_cmds;
+	u64 capabilities;
+#define IBMVFC_CAN_MIGRATE		0x01
+	u64 node_name;
+	struct srp_direct_buf async;
+	u8 partition_name[IBMVFC_MAX_NAME];
+	u8 device_name[IBMVFC_MAX_NAME];
+	u8 drc_name[IBMVFC_MAX_NAME];
+	u64 reserved2[2];
+}__attribute__((packed, aligned (8)));
+
+struct ibmvfc_common_svc_parms {
+	u16 fcph_version;
+	u16 b2b_credit;
+	u16 features;
+	u16 bb_rcv_sz; /* upper nibble is BB_SC_N */
+	u32 ratov;
+	u32 edtov;
+}__attribute__((packed, aligned (4)));
+
+struct ibmvfc_service_parms {
+	struct ibmvfc_common_svc_parms common;
+	u8 port_name[8];
+	u8 node_name[8];
+	u32 class1_parms[4];
+	u32 class2_parms[4];
+	u32 class3_parms[4];
+	u32 obsolete[4];
+	u32 vendor_version[4];
+	u32 services_avail[2];
+	u32 ext_len;
+	u32 reserved[30];
+	u32 clk_sync_qos[2];
+}__attribute__((packed, aligned (4)));
+
+struct ibmvfc_npiv_login_resp {
+	u32 version;
+	u16 status;
+	u16 error;
+	u32 flags;
+#define IBMVFC_NATIVE_FC		0x01
+#define IBMVFC_CAN_FLUSH_ON_HALT	0x08
+	u32 reserved;
+	u64 capabilites;
+	u32 max_cmds;
+	u32 scsi_id_sz;
+	u64 max_dma_len;
+	u64 scsi_id;
+	u64 port_name;
+	u64 node_name;
+	u64 link_speed;
+	u8 partition_name[IBMVFC_MAX_NAME];
+	u8 device_name[IBMVFC_MAX_NAME];
+	u8 port_loc_code[IBMVFC_MAX_NAME];
+	u8 drc_name[IBMVFC_MAX_NAME];
+	struct ibmvfc_service_parms service_parms;
+	u64 reserved2;
+}__attribute__((packed, aligned (8)));
+
+union ibmvfc_npiv_login_data {
+	struct ibmvfc_npiv_login login;
+	struct ibmvfc_npiv_login_resp resp;
+}__attribute__((packed, aligned (8)));
+
+struct ibmvfc_discover_targets_buf {
+	u32 scsi_id[1];
+#define IBMVFC_DISC_TGT_SCSI_ID_MASK	0x00ffffff
+};
+
+struct ibmvfc_discover_targets {
+	struct ibmvfc_mad_common common;
+	struct srp_direct_buf buffer;
+	u32 flags;
+	u16 status;
+	u16 error;
+	u32 bufflen;
+	u32 num_avail;
+	u32 num_written;
+	u64 reserved[2];
+}__attribute__((packed, aligned (8)));
+
+enum ibmvfc_fc_reason {
+	IBMVFC_INVALID_ELS_CMD_CODE	= 0x01,
+	IBMVFC_INVALID_VERSION		= 0x02,
+	IBMVFC_LOGICAL_ERROR		= 0x03,
+	IBMVFC_INVALID_CT_IU_SIZE	= 0x04,
+	IBMVFC_LOGICAL_BUSY		= 0x05,
+	IBMVFC_PROTOCOL_ERROR		= 0x07,
+	IBMVFC_UNABLE_TO_PERFORM_REQ	= 0x09,
+	IBMVFC_CMD_NOT_SUPPORTED	= 0x0B,
+	IBMVFC_SERVER_NOT_AVAIL		= 0x0D,
+	IBMVFC_CMD_IN_PROGRESS		= 0x0E,
+	IBMVFC_VENDOR_SPECIFIC		= 0xFF,
+};
+
+enum ibmvfc_fc_type {
+	IBMVFC_FABRIC_REJECT	= 0x01,
+	IBMVFC_PORT_REJECT	= 0x02,
+	IBMVFC_LS_REJECT		= 0x03,
+	IBMVFC_FABRIC_BUSY	= 0x04,
+	IBMVFC_PORT_BUSY		= 0x05,
+	IBMVFC_BASIC_REJECT	= 0x06,
+};
+
+enum ibmvfc_gs_explain {
+	IBMVFC_PORT_NAME_NOT_REG	= 0x02,
+};
+
+struct ibmvfc_port_login {
+	struct ibmvfc_mad_common common;
+	u64 scsi_id;
+	u16 reserved;
+	u16 fc_service_class;
+	u32 blksz;
+	u32 hdr_per_blk;
+	u16 status;
+	u16 error;		/* also fc_reason */
+	u16 fc_explain;
+	u16 fc_type;
+	u32 reserved2;
+	struct ibmvfc_service_parms service_parms;
+	struct ibmvfc_service_parms service_parms_change;
+	u64 reserved3[2];
+}__attribute__((packed, aligned (8)));
+
+struct ibmvfc_prli_svc_parms {
+	u8 type;
+#define IBMVFC_SCSI_FCP_TYPE		0x08
+	u8 type_ext;
+	u16 flags;
+#define IBMVFC_PRLI_ORIG_PA_VALID			0x8000
+#define IBMVFC_PRLI_RESP_PA_VALID			0x4000
+#define IBMVFC_PRLI_EST_IMG_PAIR			0x2000
+	u32 orig_pa;
+	u32 resp_pa;
+	u32 service_parms;
+#define IBMVFC_PRLI_TASK_RETRY			0x00000200
+#define IBMVFC_PRLI_RETRY				0x00000100
+#define IBMVFC_PRLI_DATA_OVERLAY			0x00000040
+#define IBMVFC_PRLI_INITIATOR_FUNC			0x00000020
+#define IBMVFC_PRLI_TARGET_FUNC			0x00000010
+#define IBMVFC_PRLI_READ_FCP_XFER_RDY_DISABLED	0x00000002
+#define IBMVFC_PRLI_WR_FCP_XFER_RDY_DISABLED	0x00000001
+}__attribute__((packed, aligned (4)));
+
+struct ibmvfc_process_login {
+	struct ibmvfc_mad_common common;
+	u64 scsi_id;
+	struct ibmvfc_prli_svc_parms parms;
+	u8 reserved[48];
+	u16 status;
+	u16 error;			/* also fc_reason */
+	u32 reserved2;
+	u64 reserved3[2];
+}__attribute__((packed, aligned (8)));
+
+struct ibmvfc_query_tgt {
+	struct ibmvfc_mad_common common;
+	u64 wwpn;
+	u64 scsi_id;
+	u16 status;
+	u16 error;
+	u16 fc_explain;
+	u16 fc_type;
+	u64 reserved[2];
+}__attribute__((packed, aligned (8)));
+
+struct ibmvfc_implicit_logout {
+	struct ibmvfc_mad_common common;
+	u64 old_scsi_id;
+	u64 reserved[2];
+}__attribute__((packed, aligned (8)));
+
+struct ibmvfc_tmf {
+	struct ibmvfc_mad_common common;
+	u64 scsi_id;
+	struct scsi_lun lun;
+	u32 flags;
+#define IBMVFC_TMF_ABORT_TASK		0x02
+#define IBMVFC_TMF_ABORT_TASK_SET	0x04
+#define IBMVFC_TMF_LUN_RESET		0x10
+#define IBMVFC_TMF_TGT_RESET		0x20
+#define IBMVFC_TMF_LUA_VALID		0x40
+	u32 cancel_key;
+	u32 my_cancel_key;
+#define IBMVFC_TMF_CANCEL_KEY		0x80000000
+	u32 pad;
+	u64 reserved[2];
+}__attribute__((packed, aligned (8)));
+
+enum ibmvfc_fcp_rsp_info_codes {
+	RSP_NO_FAILURE		= 0x00,
+	RSP_TMF_REJECTED		= 0x04,
+	RSP_TMF_FAILED		= 0x05,
+	RSP_TMF_INVALID_LUN	= 0x09,
+};
+
+struct ibmvfc_fcp_rsp_info {
+	u16 reserved;
+	u8 rsp_code;
+	u8 reserved2[4];
+}__attribute__((packed, aligned (2)));
+
+enum ibmvfc_fcp_rsp_flags {
+	FCP_BIDI_RSP			= 0x80,
+	FCP_BIDI_READ_RESID_UNDER	= 0x40,
+	FCP_BIDI_READ_RESID_OVER	= 0x20,
+	FCP_CONF_REQ			= 0x10,
+	FCP_RESID_UNDER			= 0x08,
+	FCP_RESID_OVER			= 0x04,
+	FCP_SNS_LEN_VALID			= 0x02,
+	FCP_RSP_LEN_VALID			= 0x01,
+};
+
+union ibmvfc_fcp_rsp_data {
+	struct ibmvfc_fcp_rsp_info info;
+	u8 sense[SCSI_SENSE_BUFFERSIZE + sizeof(struct ibmvfc_fcp_rsp_info)];
+}__attribute__((packed, aligned (8)));
+
+struct ibmvfc_fcp_rsp {
+	u64 reserved;
+	u16 retry_delay_timer;
+	u8 flags;
+	u8 scsi_status;
+	u32 fcp_resid;
+	u32 fcp_sense_len;
+	u32 fcp_rsp_len;
+	union ibmvfc_fcp_rsp_data data;
+}__attribute__((packed, aligned (8)));
+
+enum ibmvfc_cmd_flags {
+	IBMVFC_SCATTERLIST	= 0x0001,
+	IBMVFC_NO_MEM_DESC	= 0x0002,
+	IBMVFC_READ			= 0x0004,
+	IBMVFC_WRITE		= 0x0008,
+	IBMVFC_TMF			= 0x0080,
+	IBMVFC_CLASS_3_ERR	= 0x0100,
+};
+
+enum ibmvfc_fc_task_attr {
+	IBMVFC_SIMPLE_TASK	= 0x00,
+	IBMVFC_HEAD_OF_QUEUE	= 0x01,
+	IBMVFC_ORDERED_TASK	= 0x02,
+	IBMVFC_ACA_TASK		= 0x04,
+};
+
+enum ibmvfc_fc_tmf_flags {
+	IBMVFC_ABORT_TASK_SET	= 0x02,
+	IBMVFC_LUN_RESET		= 0x10,
+	IBMVFC_TARGET_RESET	= 0x20,
+};
+
+struct ibmvfc_fcp_cmd_iu {
+	struct scsi_lun lun;
+	u8 crn;
+	u8 pri_task_attr;
+	u8 tmf_flags;
+	u8 add_cdb_len;
+#define IBMVFC_RDDATA		0x02
+#define IBMVFC_WRDATA		0x01
+	u8 cdb[IBMVFC_MAX_CDB_LEN];
+	u32 xfer_len;
+}__attribute__((packed, aligned (4)));
+
+struct ibmvfc_cmd {
+	u64 task_tag;
+	u32 frame_type;
+	u32 payload_len;
+	u32 resp_len;
+	u32 adapter_resid;
+	u16 status;
+	u16 error;
+	u16 flags;
+	u16 response_flags;
+#define IBMVFC_ADAPTER_RESID_VALID	0x01
+	u32 cancel_key;
+	u32 exchange_id;
+	struct srp_direct_buf ext_func;
+	struct srp_direct_buf ioba;
+	struct srp_direct_buf resp;
+	u64 correlation;
+	u64 tgt_scsi_id;
+	u64 tag;
+	u64 reserved3[2];
+	struct ibmvfc_fcp_cmd_iu iu;
+	struct ibmvfc_fcp_rsp rsp;
+}__attribute__((packed, aligned (8)));
+
+struct ibmvfc_trace_start_entry {
+	u32 xfer_len;
+}__attribute__((packed));
+
+struct ibmvfc_trace_end_entry {
+	u16 status;
+	u16 error;
+	u8 fcp_rsp_flags;
+	u8 rsp_code;
+	u8 scsi_status;
+	u8 reserved;
+}__attribute__((packed));
+
+struct ibmvfc_trace_entry {
+	struct ibmvfc_event *evt;
+	u32 time;
+	u32 scsi_id;
+	u32 lun;
+	u8 fmt;
+	u8 op_code;
+	u8 tmf_flags;
+	u8 type;
+#define IBMVFC_TRC_START	0x00
+#define IBMVFC_TRC_END		0xff
+	union {
+		struct ibmvfc_trace_start_entry start;
+		struct ibmvfc_trace_end_entry end;
+	} u;
+}__attribute__((packed, aligned (8)));
+
+enum ibmvfc_crq_formats {
+	IBMVFC_CMD_FORMAT		= 0x01,
+	IBMVFC_ASYNC_EVENT	= 0x02,
+	IBMVFC_MAD_FORMAT		= 0x04,
+};
+
+enum ibmvfc_async_event {
+	IBMVFC_AE_ELS_PLOGI		= 0x0001,
+	IBMVFC_AE_ELS_LOGO		= 0x0002,
+	IBMVFC_AE_ELS_PRLO		= 0x0004,
+	IBMVFC_AE_SCN_NPORT		= 0x0008,
+	IBMVFC_AE_SCN_GROUP		= 0x0010,
+	IBMVFC_AE_SCN_DOMAIN		= 0x0020,
+	IBMVFC_AE_SCN_FABRIC		= 0x0040,
+	IBMVFC_AE_LINK_UP			= 0x0080,
+	IBMVFC_AE_LINK_DOWN		= 0x0100,
+	IBMVFC_AE_LINK_DEAD		= 0x0200,
+	IBMVFC_AE_HALT			= 0x0400,
+	IBMVFC_AE_RESUME			= 0x0800,
+	IBMVFC_AE_ADAPTER_FAILED	= 0x1000,
+};
+
+struct ibmvfc_crq {
+	u8 valid;
+	u8 format;
+	u8 reserved[6];
+	u64 ioba;
+}__attribute__((packed, aligned (8)));
+
+struct ibmvfc_crq_queue {
+	struct ibmvfc_crq *msgs;
+	int size, cur;
+	dma_addr_t msg_token;
+};
+
+struct ibmvfc_async_crq {
+	u8 valid;
+	u8 pad[3];
+	u32 pad2;
+	u64 event;
+	u64 scsi_id;
+	u64 wwpn;
+	u64 node_name;
+	u64 reserved;
+}__attribute__((packed, aligned (8)));
+
+struct ibmvfc_async_crq_queue {
+	struct ibmvfc_async_crq *msgs;
+	int size, cur;
+	dma_addr_t msg_token;
+};
+
+union ibmvfc_iu {
+	struct ibmvfc_mad_common mad_common;
+	struct ibmvfc_npiv_login_mad npiv_login;
+	struct ibmvfc_discover_targets discover_targets;
+	struct ibmvfc_port_login plogi;
+	struct ibmvfc_process_login prli;
+	struct ibmvfc_query_tgt query_tgt;
+	struct ibmvfc_implicit_logout implicit_logout;
+	struct ibmvfc_tmf tmf;
+	struct ibmvfc_cmd cmd;
+}__attribute__((packed, aligned (8)));
+
+enum ibmvfc_target_action {
+	IBMVFC_TGT_ACTION_NONE = 0,
+	IBMVFC_TGT_ACTION_INIT,
+	IBMVFC_TGT_ACTION_INIT_WAIT,
+	IBMVFC_TGT_ACTION_ADD_RPORT,
+	IBMVFC_TGT_ACTION_DEL_RPORT,
+};
+
+struct ibmvfc_target {
+	struct list_head queue;
+	struct ibmvfc_host *vhost;
+	u64 scsi_id;
+	u64 new_scsi_id;
+	struct fc_rport *rport;
+	int target_id;
+	enum ibmvfc_target_action action;
+	int need_login;
+	int init_retries;
+	struct ibmvfc_service_parms service_parms;
+	struct ibmvfc_service_parms service_parms_change;
+	struct fc_rport_identifiers ids;
+	void (*job_step) (struct ibmvfc_target *);
+	struct kref kref;
+};
+
+/* a unit of work for the hosting partition */
+struct ibmvfc_event {
+	struct list_head queue;
+	struct ibmvfc_host *vhost;
+	struct ibmvfc_target *tgt;
+	struct scsi_cmnd *cmnd;
+	atomic_t free;
+	union ibmvfc_iu *xfer_iu;
+	void (*done) (struct ibmvfc_event *);
+	struct ibmvfc_crq crq;
+	union ibmvfc_iu iu;
+	union ibmvfc_iu *sync_iu;
+	struct srp_direct_buf *ext_list;
+	dma_addr_t ext_list_token;
+	struct completion comp;
+	struct timer_list timer;
+};
+
+/* a pool of event structs for use */
+struct ibmvfc_event_pool {
+	struct ibmvfc_event *events;
+	u32 size;
+	union ibmvfc_iu *iu_storage;
+	dma_addr_t iu_token;
+};
+
+enum ibmvfc_host_action {
+	IBMVFC_HOST_ACTION_NONE = 0,
+	IBMVFC_HOST_ACTION_INIT,
+	IBMVFC_HOST_ACTION_INIT_WAIT,
+	IBMVFC_HOST_ACTION_QUERY,
+	IBMVFC_HOST_ACTION_QUERY_TGTS,
+	IBMVFC_HOST_ACTION_TGT_DEL,
+	IBMVFC_HOST_ACTION_ALLOC_TGTS,
+	IBMVFC_HOST_ACTION_TGT_INIT,
+	IBMVFC_HOST_ACTION_TGT_ADD,
+};
+
+enum ibmvfc_host_state {
+	IBMVFC_NO_CRQ = 0,
+	IBMVFC_INITIALIZING,
+	IBMVFC_ACTIVE,
+	IBMVFC_HALTED,
+	IBMVFC_LINK_DOWN,
+	IBMVFC_LINK_DEAD,
+	IBMVFC_HOST_OFFLINE,
+};
+
+struct ibmvfc_host {
+	char name[8];
+	struct list_head queue;
+	struct Scsi_Host *host;
+	enum ibmvfc_host_state state;
+	enum ibmvfc_host_action action;
+#define IBMVFC_NUM_TRACE_INDEX_BITS		8
+#define IBMVFC_NUM_TRACE_ENTRIES		(1 << IBMVFC_NUM_TRACE_INDEX_BITS)
+#define IBMVFC_TRACE_SIZE	(sizeof(struct ibmvfc_trace_entry) * IBMVFC_NUM_TRACE_ENTRIES)
+	struct ibmvfc_trace_entry *trace;
+	u32 trace_index:IBMVFC_NUM_TRACE_INDEX_BITS;
+	int num_targets;
+	struct list_head targets;
+	struct list_head sent;
+	struct list_head free;
+	struct device *dev;
+	struct ibmvfc_event_pool pool;
+	struct dma_pool *sg_pool;
+	mempool_t *tgt_pool;
+	struct ibmvfc_crq_queue crq;
+	struct ibmvfc_async_crq_queue async_crq;
+	struct ibmvfc_npiv_login login_info;
+	union ibmvfc_npiv_login_data *login_buf;
+	dma_addr_t login_buf_dma;
+	int disc_buf_sz;
+	int log_level;
+	struct ibmvfc_discover_targets_buf *disc_buf;
+	int task_set;
+	int init_retries;
+	int discovery_threads;
+	int client_migrated;
+	int reinit;
+	int events_to_log;
+#define IBMVFC_AE_LINKUP	0x0001
+#define IBMVFC_AE_LINKDOWN	0x0002
+#define IBMVFC_AE_RSCN		0x0004
+	dma_addr_t disc_buf_dma;
+	unsigned int partition_number;
+	char partition_name[97];
+	void (*job_step) (struct ibmvfc_host *);
+	struct task_struct *work_thread;
+	wait_queue_head_t init_wait_q;
+	wait_queue_head_t work_wait_q;
+};
+
+#define DBG_CMD(CMD) do { if (ibmvfc_debug) CMD; } while (0)
+
+#define tgt_dbg(t, fmt, ...)			\
+	DBG_CMD(dev_info((t)->vhost->dev, "%lX: " fmt, (t)->scsi_id, ##__VA_ARGS__))
+
+#define tgt_err(t, fmt, ...)		\
+	dev_err((t)->vhost->dev, "%lX: " fmt, (t)->scsi_id, ##__VA_ARGS__)
+
+#define ibmvfc_dbg(vhost, ...) \
+	DBG_CMD(dev_info((vhost)->dev, ##__VA_ARGS__))
+
+#define ibmvfc_log(vhost, level, ...) \
+	do { \
+		if (level >= (vhost)->log_level) \
+			dev_err((vhost)->dev, ##__VA_ARGS__); \
+	} while (0)
+
+#define ENTER DBG_CMD(printk(KERN_INFO IBMVFC_NAME": Entering %s\n", __FUNCTION__))
+#define LEAVE DBG_CMD(printk(KERN_INFO IBMVFC_NAME": Leaving %s\n", __FUNCTION__))
+
+#ifdef CONFIG_SCSI_IBMVFC_TRACE
+#define ibmvfc_create_trace_file(kobj, attr) sysfs_create_bin_file(kobj, attr)
+#define ibmvfc_remove_trace_file(kobj, attr) sysfs_remove_bin_file(kobj, attr)
+#else
+#define ibmvfc_create_trace_file(kobj, attr) 0
+#define ibmvfc_remove_trace_file(kobj, attr) do { } while(0)
+#endif
+
+#endif
diff -puN /dev/null drivers/scsi/ibmvscsi/ibmvfc.c
--- /dev/null	2006-11-25 06:17:37.000000000 -0600
+++ linux-2.6-bjking1/drivers/scsi/ibmvscsi/ibmvfc.c	2008-06-24 13:03:17.000000000 -0500
@@ -0,0 +1,3906 @@
+/*
+ * ibmvfc.c -- driver for IBM Power Virtual Fibre Channel Adapter
+ *
+ * Written By: Brian King <brking@xxxxxxxxxxxxxxxxxx>, IBM Corporation
+ *
+ * Copyright (C) IBM Corporation, 2008
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmapool.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/kthread.h>
+#include <linux/of.h>
+#include <linux/stringify.h>
+#include <asm/firmware.h>
+#include <asm/irq.h>
+#include <asm/vio.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_tcq.h>
+#include <scsi/scsi_transport_fc.h>
+#include "ibmvfc.h"
+
+static unsigned int init_timeout = IBMVFC_INIT_TIMEOUT;
+static unsigned int default_timeout = IBMVFC_DEFAULT_TIMEOUT;
+static unsigned int max_lun = IBMVFC_MAX_LUN;
+static unsigned int max_targets = IBMVFC_MAX_TARGETS;
+static unsigned int max_requests = IBMVFC_MAX_REQUESTS_DEFAULT;
+static unsigned int disc_threads = IBMVFC_MAX_DISC_THREADS;
+static unsigned int dev_loss_tmo = IBMVFC_DEV_LOSS_TMO;
+static unsigned int ibmvfc_debug = IBMVFC_DEBUG;
+static unsigned int log_level = IBMVFC_DEFAULT_LOG_LEVEL;
+static LIST_HEAD(ibmvfc_head);
+static DEFINE_SPINLOCK(ibmvfc_driver_lock);
+static struct scsi_transport_template *ibmvfc_transport_template;
+
+MODULE_DESCRIPTION("IBM Virtual Fibre Channel Driver");
+MODULE_AUTHOR("Brian King <brking@xxxxxxxxxxxxxxxxxx>");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(IBMVFC_DRIVER_VERSION);
+
+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) "]");
+module_param_named(default_timeout, default_timeout, uint, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(default_timeout,
+		 "Default timeout in seconds for initialization and EH commands. "
+		 "[Default=" __stringify(IBMVFC_DEFAULT_TIMEOUT) "]");
+module_param_named(max_requests, max_requests, uint, S_IRUGO);
+MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter. "
+		 "[Default=" __stringify(IBMVFC_MAX_REQUESTS_DEFAULT) "]");
+module_param_named(max_lun, max_lun, uint, S_IRUGO);
+MODULE_PARM_DESC(max_lun, "Maximum allowed LUN. "
+		 "[Default=" __stringify(IBMVFC_MAX_LUN) "]");
+module_param_named(max_targets, max_targets, uint, S_IRUGO);
+MODULE_PARM_DESC(max_targets, "Maximum allowed targets. "
+		 "[Default=" __stringify(IBMVFC_MAX_TARGETS) "]");
+module_param_named(disc_threads, disc_threads, uint, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(disc_threads, "Number of device discovery threads to use. "
+		 "[Default=" __stringify(IBMVFC_MAX_DISC_THREADS) "]");
+module_param_named(debug, ibmvfc_debug, uint, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug, "Enable driver debug information. "
+		 "[Default=" __stringify(IBMVFC_DEBUG) "]");
+module_param_named(dev_loss_tmo, dev_loss_tmo, uint, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(dev_loss_tmo, "Maximum number of seconds that the FC "
+		 "transport should insulate the loss of a remote port. Once this "
+		 "value is exceeded, the scsi target is removed. "
+		 "[Default=" __stringify(IBMVFC_DEV_LOSS_TMO) "]");
+module_param_named(log_level, log_level, uint, 0);
+MODULE_PARM_DESC(log_level, "Set to 0 - 4 for increasing verbosity of device driver. "
+		 "[Default=" __stringify(IBMVFC_DEFAULT_LOG_LEVEL) "]");
+
+static const struct {
+	u16 status;
+	u16 error;
+	u8 result;
+	u8 retry;
+	int log;
+	char *name;
+} cmd_status [] = {
+	{ IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_ESTABLISH, DID_ERROR, 1, 1, "unable to establish" },
+	{ IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_FAULT, DID_OK, 1, 0, "transport fault" },
+	{ IBMVFC_FABRIC_MAPPED, IBMVFC_CMD_TIMEOUT, DID_TIME_OUT, 1, 1, "command timeout" },
+	{ IBMVFC_FABRIC_MAPPED, IBMVFC_ENETDOWN, DID_NO_CONNECT, 1, 1, "network down" },
+	{ IBMVFC_FABRIC_MAPPED, IBMVFC_HW_FAILURE, DID_ERROR, 1, 1, "hardware failure" },
+	{ IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DOWN_ERR, DID_REQUEUE, 0, 0, "link down" },
+	{ IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DEAD_ERR, DID_ERROR, 0, 0, "link dead" },
+	{ IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_REGISTER, DID_ERROR, 1, 1, "unable to register" },
+	{ IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_BUSY, DID_BUS_BUSY, 1, 0, "transport busy" },
+	{ IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_DEAD, DID_ERROR, 0, 1, "transport dead" },
+	{ IBMVFC_FABRIC_MAPPED, IBMVFC_CONFIG_ERROR, DID_ERROR, 1, 1, "configuration error" },
+	{ IBMVFC_FABRIC_MAPPED, IBMVFC_NAME_SERVER_FAIL, DID_ERROR, 1, 1, "name server failure" },
+	{ IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_HALTED, DID_REQUEUE, 0, 0, "link halted" },
+	{ IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_GENERAL, DID_OK, 1, 0, "general transport error" },
+
+	{ IBMVFC_VIOS_FAILURE, IBMVFC_CRQ_FAILURE, DID_REQUEUE, 1, 1, "CRQ failure" },
+	{ IBMVFC_VIOS_FAILURE, IBMVFC_SW_FAILURE, DID_ERROR, 0, 1, "software failure" },
+	{ IBMVFC_VIOS_FAILURE, IBMVFC_INVALID_PARAMETER, DID_ABORT, 0, 1, "invalid parameter" },
+	{ IBMVFC_VIOS_FAILURE, IBMVFC_MISSING_PARAMETER, DID_ABORT, 0, 1, "missing parameter" },
+	{ IBMVFC_VIOS_FAILURE, IBMVFC_HOST_IO_BUS, DID_ERROR, 1, 1, "host I/O bus failure" },
+	{ IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED, DID_ABORT, 0, 1, "transaction cancelled" },
+	{ IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED_IMPLICIT, DID_ABORT, 0, 1, "transaction cancelled implicit" },
+	{ IBMVFC_VIOS_FAILURE, IBMVFC_INSUFFICIENT_RESOURCE, DID_REQUEUE, 1, 1, "insufficient resources" },
+	{ IBMVFC_VIOS_FAILURE, IBMVFC_COMMAND_FAILED, DID_ERROR, 1, 1, "command failed" },
+
+	{ IBMVFC_FC_FAILURE, IBMVFC_INVALID_ELS_CMD_CODE, DID_ERROR, 0, 1, "invalid ELS command code" },
+	{ IBMVFC_FC_FAILURE, IBMVFC_INVALID_VERSION, DID_ERROR, 0, 1, "invalid version level" },
+	{ IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_ERROR, DID_ERROR, 1, 1, "logical error" },
+	{ IBMVFC_FC_FAILURE, IBMVFC_INVALID_CT_IU_SIZE, DID_ERROR, 0, 1, "invalid CT_IU size" },
+	{ IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_BUSY, DID_REQUEUE, 1, 0, "logical busy" },
+	{ IBMVFC_FC_FAILURE, IBMVFC_PROTOCOL_ERROR, DID_ERROR, 1, 1, "protocol error" },
+	{ IBMVFC_FC_FAILURE, IBMVFC_UNABLE_TO_PERFORM_REQ, DID_ERROR, 1, 1, "unable to perform request" },
+	{ IBMVFC_FC_FAILURE, IBMVFC_CMD_NOT_SUPPORTED, DID_ERROR, 0, 0, "command not supported" },
+	{ IBMVFC_FC_FAILURE, IBMVFC_SERVER_NOT_AVAIL, DID_ERROR, 0, 1, "server not available" },
+	{ IBMVFC_FC_FAILURE, IBMVFC_CMD_IN_PROGRESS, DID_ERROR, 0, 1, "command already in progress" },
+	{ IBMVFC_FC_FAILURE, IBMVFC_VENDOR_SPECIFIC, DID_ERROR, 1, 1, "vendor specific" },
+
+	{ IBMVFC_FC_SCSI_ERROR, 0, DID_OK, 1, 0, "SCSI error" },
+};
+
+static void ibmvfc_npiv_login(struct ibmvfc_host *);
+static void ibmvfc_tgt_send_prli(struct ibmvfc_target *);
+static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *);
+static void ibmvfc_tgt_query_target(struct ibmvfc_target *);
+
+static const char *unknown_error = "unknown error";
+
+#ifdef CONFIG_SCSI_IBMVFC_TRACE
+/**
+ * ibmvfc_trc_start - Log a start trace entry
+ * @evt:		ibmvfc event struct
+ *
+ **/
+static void ibmvfc_trc_start(struct ibmvfc_event *evt)
+{
+	struct ibmvfc_host *vhost = evt->vhost;
+	struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd;
+	struct ibmvfc_mad_common *mad = &evt->iu.mad_common;
+	struct ibmvfc_trace_entry *entry;
+
+	entry = &vhost->trace[vhost->trace_index++];
+	entry->evt = evt;
+	entry->time = jiffies;
+	entry->fmt = evt->crq.format;
+	entry->type = IBMVFC_TRC_START;
+
+	switch (entry->fmt) {
+	case IBMVFC_CMD_FORMAT:
+		entry->op_code = vfc_cmd->iu.cdb[0];
+		entry->scsi_id = vfc_cmd->tgt_scsi_id;
+		entry->lun = scsilun_to_int(&vfc_cmd->iu.lun);
+		entry->tmf_flags = vfc_cmd->iu.tmf_flags;
+		entry->u.start.xfer_len = vfc_cmd->iu.xfer_len;
+		break;
+	case IBMVFC_MAD_FORMAT:
+		entry->op_code = mad->opcode;
+		break;
+	default:
+		break;
+	};
+}
+
+/**
+ * ibmvfc_trc_end - Log an end trace entry
+ * @evt:		ibmvfc event struct
+ *
+ **/
+static void ibmvfc_trc_end(struct ibmvfc_event *evt)
+{
+	struct ibmvfc_host *vhost = evt->vhost;
+	struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
+	struct ibmvfc_mad_common *mad = &evt->xfer_iu->mad_common;
+	struct ibmvfc_trace_entry *entry = &vhost->trace[vhost->trace_index++];
+
+	entry->evt = evt;
+	entry->time = jiffies;
+	entry->fmt = evt->crq.format;
+	entry->type = IBMVFC_TRC_END;
+
+	switch (entry->fmt) {
+	case IBMVFC_CMD_FORMAT:
+		entry->op_code = vfc_cmd->iu.cdb[0];
+		entry->scsi_id = vfc_cmd->tgt_scsi_id;
+		entry->lun = scsilun_to_int(&vfc_cmd->iu.lun);
+		entry->tmf_flags = vfc_cmd->iu.tmf_flags;
+		entry->u.end.status = vfc_cmd->status;
+		entry->u.end.error = vfc_cmd->error;
+		entry->u.end.fcp_rsp_flags = vfc_cmd->rsp.flags;
+		entry->u.end.rsp_code = vfc_cmd->rsp.data.info.rsp_code;
+		entry->u.end.scsi_status = vfc_cmd->rsp.scsi_status;
+		break;
+	case IBMVFC_MAD_FORMAT:
+		entry->op_code = mad->opcode;
+		entry->u.end.status = mad->status;
+		break;
+	default:
+		break;
+
+	};
+}
+
+#else
+#define ibmvfc_trc_start(evt) do { } while(0)
+#define ibmvfc_trc_end(evt) do { } while(0)
+#endif
+
+/**
+ * ibmvfc_get_err_index - Find the index into cmd_status for the fcp response
+ * @status:		status / error class
+ * @error:		error
+ *
+ * Return value:
+ *	index into cmd_status / -EINVAL on failure
+ **/
+static int ibmvfc_get_err_index(u16 status, u16 error)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(cmd_status); i++)
+		if ((cmd_status[i].status & status) == cmd_status[i].status &&
+		    cmd_status[i].error == error)
+			return i;
+
+	return -EINVAL;
+}
+
+/**
+ * ibmvfc_get_cmd_error - Find the error description for the fcp response
+ * @status:		status / error class
+ * @error:		error
+ *
+ * Return value:
+ *	error description string
+ **/
+static const char *ibmvfc_get_cmd_error(u16 status, u16 error)
+{
+	int rc = ibmvfc_get_err_index(status, error);
+	if (rc >= 0)
+		return cmd_status[rc].name;
+	return unknown_error;
+}
+
+/**
+ * ibmvfc_get_err_result - Find the scsi status to return for the fcp response
+ * @vfc_cmd:	ibmvfc command struct
+ *
+ * Return value:
+ *	SCSI result value to return for completed command
+ **/
+static int ibmvfc_get_err_result(struct ibmvfc_cmd *vfc_cmd)
+{
+	int err;
+	struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
+	int fc_rsp_len = rsp->fcp_rsp_len;
+
+	if ((rsp->flags & FCP_RSP_LEN_VALID) &&
+	    ((!fc_rsp_len && fc_rsp_len != 4 && fc_rsp_len != 8) ||
+	     rsp->data.info.rsp_code))
+		return DID_ERROR << 16;
+
+	if (!vfc_cmd->status) {
+		if (rsp->flags & FCP_RESID_OVER)
+			return rsp->scsi_status | (DID_ERROR << 16);
+		else
+			return rsp->scsi_status | (DID_OK << 16);
+	}
+
+	err = ibmvfc_get_err_index(vfc_cmd->status, vfc_cmd->error);
+	if (err >= 0)
+		return rsp->scsi_status | (cmd_status[err].result << 16);
+	return rsp->scsi_status | (DID_ERROR << 16);
+}
+
+/**
+ * ibmvfc_retry_cmd - Determine if error status is retryable
+ * @status:		status / error class
+ * @error:		error
+ *
+ * Return value:
+ *	1 if error should be retried / 0 if it should not
+ **/
+static int ibmvfc_retry_cmd(u16 status, u16 error)
+{
+	int rc = ibmvfc_get_err_index(status, error);
+
+	if (rc >= 0)
+		return cmd_status[rc].retry;
+	return 1;
+}
+
+static const char *unknown_fc_explain = "unknown fc explain";
+
+static const struct {
+	u16 fc_explain;
+	char *name;
+} ls_explain [] = {
+	{ 0x00, "no additional explanation" },
+	{ 0x01, "service parameter error - options" },
+	{ 0x03, "service parameter error - initiator control" },
+	{ 0x05, "service parameter error - recipient control" },
+	{ 0x07, "service parameter error - received data field size" },
+	{ 0x09, "service parameter error - concurrent seq" },
+	{ 0x0B, "service parameter error - credit" },
+	{ 0x0D, "invalid N_Port/F_Port_Name" },
+	{ 0x0E, "invalid node/Fabric Name" },
+	{ 0x0F, "invalid common service parameters" },
+	{ 0x11, "invalid association header" },
+	{ 0x13, "association header required" },
+	{ 0x15, "invalid originator S_ID" },
+	{ 0x17, "invalid OX_ID-RX-ID combination" },
+	{ 0x19, "command (request) already in progress" },
+	{ 0x1E, "N_Port Login requested" },
+	{ 0x1F, "Invalid N_Port_ID" },
+};
+
+static const struct {
+	u16 fc_explain;
+	char *name;
+} gs_explain [] = {
+	{ 0x00, "no additional explanation" },
+	{ 0x01, "port identifier not registered" },
+	{ 0x02, "port name not registered" },
+	{ 0x03, "node name not registered" },
+	{ 0x04, "class of service not registered" },
+	{ 0x06, "initial process associator not registered" },
+	{ 0x07, "FC-4 TYPEs not registered" },
+	{ 0x08, "symbolic port name not registered" },
+	{ 0x09, "symbolic node name not registered" },
+	{ 0x0A, "port type not registered" },
+	{ 0xF0, "authorization exception" },
+	{ 0xF1, "authentication exception" },
+	{ 0xF2, "data base full" },
+	{ 0xF3, "data base empty" },
+	{ 0xF4, "processing request" },
+	{ 0xF5, "unable to verify connection" },
+	{ 0xF6, "devices not in a common zone" },
+};
+
+/**
+ * ibmvfc_get_ls_explain - Return the FC Explain description text
+ * @status:	FC Explain status
+ *
+ * Returns:
+ *	error string
+ **/
+static const char *ibmvfc_get_ls_explain(u16 status)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(ls_explain); i++)
+		if (ls_explain[i].fc_explain == status)
+			return ls_explain[i].name;
+
+	return unknown_fc_explain;
+}
+
+/**
+ * ibmvfc_get_gs_explain - Return the FC Explain description text
+ * @status:	FC Explain status
+ *
+ * Returns:
+ *	error string
+ **/
+static const char *ibmvfc_get_gs_explain(u16 status)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(gs_explain); i++)
+		if (gs_explain[i].fc_explain == status)
+			return gs_explain[i].name;
+
+	return unknown_fc_explain;
+}
+
+static const struct {
+	enum ibmvfc_fc_type fc_type;
+	char *name;
+} fc_type [] = {
+	{ IBMVFC_FABRIC_REJECT, "fabric reject" },
+	{ IBMVFC_PORT_REJECT, "port reject" },
+	{ IBMVFC_LS_REJECT, "ELS reject" },
+	{ IBMVFC_FABRIC_BUSY, "fabric busy" },
+	{ IBMVFC_PORT_BUSY, "port busy" },
+	{ IBMVFC_BASIC_REJECT, "basic reject" },
+};
+
+static const char *unknown_fc_type = "unknown fc type";
+
+/**
+ * ibmvfc_get_fc_type - Return the FC Type description text
+ * @status:	FC Type error status
+ *
+ * Returns:
+ *	error string
+ **/
+static const char *ibmvfc_get_fc_type(u16 status)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(fc_type); i++)
+		if (fc_type[i].fc_type == status)
+			return fc_type[i].name;
+
+	return unknown_fc_type;
+}
+
+/**
+ * ibmvfc_set_tgt_action - Set the next init action for the target
+ * @tgt:		ibmvfc target struct
+ * @action:		action to perform
+ *
+ **/
+static void ibmvfc_set_tgt_action(struct ibmvfc_target *tgt,
+				  enum ibmvfc_target_action action)
+{
+	switch (tgt->action) {
+	case IBMVFC_TGT_ACTION_DEL_RPORT:
+		break;
+	default:
+		tgt->action = action;
+		break;
+	}
+}
+
+/**
+ * ibmvfc_set_host_state - Set the state for the host
+ * @vhost:		ibmvfc host struct
+ * @state:		state to set host to
+ *
+ * Returns:
+ *	0 if state changed / non-zero if not changed
+ **/
+static int ibmvfc_set_host_state(struct ibmvfc_host *vhost,
+				  enum ibmvfc_host_state state)
+{
+	int rc = 0;
+
+	switch (vhost->state) {
+	case IBMVFC_HOST_OFFLINE:
+		rc = -EINVAL;
+		break;
+	default:
+		vhost->state = state;
+		break;
+	};
+
+	return rc;
+}
+
+/**
+ * ibmvfc_set_host_action - Set the next init action for the host
+ * @vhost:		ibmvfc host struct
+ * @action:		action to perform
+ *
+ **/
+static void ibmvfc_set_host_action(struct ibmvfc_host *vhost,
+				   enum ibmvfc_host_action action)
+{
+	switch (action) {
+	case IBMVFC_HOST_ACTION_ALLOC_TGTS:
+		if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT)
+			vhost->action = action;
+		break;
+	case IBMVFC_HOST_ACTION_INIT_WAIT:
+		if (vhost->action == IBMVFC_HOST_ACTION_INIT)
+			vhost->action = action;
+		break;
+	case IBMVFC_HOST_ACTION_QUERY:
+		switch (vhost->action) {
+		case IBMVFC_HOST_ACTION_INIT_WAIT:
+		case IBMVFC_HOST_ACTION_NONE:
+		case IBMVFC_HOST_ACTION_TGT_ADD:
+			vhost->action = action;
+			break;
+		default:
+			break;
+		};
+		break;
+	case IBMVFC_HOST_ACTION_TGT_INIT:
+		if (vhost->action == IBMVFC_HOST_ACTION_ALLOC_TGTS)
+			vhost->action = action;
+		break;
+	case IBMVFC_HOST_ACTION_INIT:
+	case IBMVFC_HOST_ACTION_TGT_DEL:
+	case IBMVFC_HOST_ACTION_QUERY_TGTS:
+	case IBMVFC_HOST_ACTION_TGT_ADD:
+	case IBMVFC_HOST_ACTION_NONE:
+	default:
+		vhost->action = action;
+		break;
+	};
+}
+
+/**
+ * ibmvfc_reinit_host - Re-start host initialization (no NPIV Login)
+ * @vhost:		ibmvfc host struct
+ *
+ * Return value:
+ *	nothing
+ **/
+static void ibmvfc_reinit_host(struct ibmvfc_host *vhost)
+{
+	if (vhost->action == IBMVFC_HOST_ACTION_NONE) {
+		scsi_block_requests(vhost->host);
+		ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING);
+		ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
+	} else
+		vhost->reinit = 1;
+
+	wake_up(&vhost->work_wait_q);
+}
+
+/**
+ * ibmvfc_link_down - Handle a link down event from the adapter
+ * @vhost:	ibmvfc host struct
+ * @state:	ibmvfc host state to enter
+ *
+ **/
+static void ibmvfc_link_down(struct ibmvfc_host *vhost,
+			     enum ibmvfc_host_state state)
+{
+	struct ibmvfc_target *tgt;
+
+	ENTER;
+	scsi_block_requests(vhost->host);
+	list_for_each_entry(tgt, &vhost->targets, queue)
+		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
+	ibmvfc_set_host_state(vhost, state);
+	ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
+	vhost->events_to_log |= IBMVFC_AE_LINKDOWN;
+	wake_up(&vhost->work_wait_q);
+	LEAVE;
+}
+
+/**
+ * ibmvfc_init_host - Start host initialization
+ * @vhost:		ibmvfc host struct
+ *
+ * Return value:
+ *	nothing
+ **/
+static void ibmvfc_init_host(struct ibmvfc_host *vhost)
+{
+	struct ibmvfc_target *tgt;
+
+	if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
+		if (++vhost->init_retries > IBMVFC_MAX_INIT_RETRIES) {
+			dev_err(vhost->dev,
+				"Host initialization retries exceeded. Taking adapter offline\n");
+			ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
+			return;
+		}
+	}
+
+	if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
+		list_for_each_entry(tgt, &vhost->targets, queue)
+			tgt->need_login = 1;
+		scsi_block_requests(vhost->host);
+		ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
+		vhost->job_step = ibmvfc_npiv_login;
+		wake_up(&vhost->work_wait_q);
+	}
+}
+
+/**
+ * ibmvfc_send_crq - Send a CRQ
+ * @vhost:	ibmvfc host struct
+ * @word1:	the first 64 bits of the data
+ * @word2:	the second 64 bits of the data
+ *
+ * Return value:
+ *	0 on success / other on failure
+ **/
+static int ibmvfc_send_crq(struct ibmvfc_host *vhost, u64 word1, u64 word2)
+{
+	struct vio_dev *vdev = to_vio_dev(vhost->dev);
+	return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
+}
+
+/**
+ * ibmvfc_send_crq_init - Send a CRQ init message
+ * @vhost:	ibmvfc host struct
+ *
+ * Return value:
+ *	0 on success / other on failure
+ **/
+static int ibmvfc_send_crq_init(struct ibmvfc_host *vhost)
+{
+	ibmvfc_dbg(vhost, "Sending CRQ init\n");
+	return ibmvfc_send_crq(vhost, 0xC001000000000000LL, 0);
+}
+
+/**
+ * ibmvfc_send_crq_init_complete - Send a CRQ init complete message
+ * @vhost:	ibmvfc host struct
+ *
+ * Return value:
+ *	0 on success / other on failure
+ **/
+static int ibmvfc_send_crq_init_complete(struct ibmvfc_host *vhost)
+{
+	ibmvfc_dbg(vhost, "Sending CRQ init complete\n");
+	return ibmvfc_send_crq(vhost, 0xC002000000000000LL, 0);
+}
+
+/**
+ * ibmvfc_release_crq_queue - Deallocates data and unregisters CRQ
+ * @vhost:	ibmvfc host struct
+ *
+ * Frees irq, deallocates a page for messages, unmaps dma, and unregisters
+ * the crq with the hypervisor.
+ **/
+static void ibmvfc_release_crq_queue(struct ibmvfc_host *vhost)
+{
+	long rc;
+	struct vio_dev *vdev = to_vio_dev(vhost->dev);
+	struct ibmvfc_crq_queue *crq = &vhost->crq;
+
+	ibmvfc_dbg(vhost, "Releasing CRQ\n");
+	free_irq(vdev->irq, vhost);
+	do {
+		rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
+	} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
+
+	vhost->state = IBMVFC_NO_CRQ;
+	dma_unmap_single(vhost->dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
+	free_page((unsigned long)crq->msgs);
+}
+
+/**
+ * ibmvfc_reenable_crq_queue - reenables the CRQ
+ * @vhost:	ibmvfc host struct
+ *
+ * Return value:
+ *	0 on success / other on failure
+ **/
+static int ibmvfc_reenable_crq_queue(struct ibmvfc_host *vhost)
+{
+	int rc;
+	struct vio_dev *vdev = to_vio_dev(vhost->dev);
+
+	/* Re-enable the CRQ */
+	do {
+		rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
+	} while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
+
+	if (rc)
+		dev_err(vhost->dev, "Error enabling adapter (rc=%d)\n", rc);
+
+	return rc;
+}
+
+/**
+ * ibmvfc_reset_crq - resets a crq after a failure
+ * @vhost:	ibmvfc host struct
+ *
+ * Return value:
+ *	0 on success / other on failure
+ **/
+static int ibmvfc_reset_crq(struct ibmvfc_host *vhost)
+{
+	int rc;
+	struct vio_dev *vdev = to_vio_dev(vhost->dev);
+	struct ibmvfc_crq_queue *crq = &vhost->crq;
+
+	/* Close the CRQ */
+	do {
+		rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
+	} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
+
+	vhost->state = IBMVFC_NO_CRQ;
+	ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
+
+	/* Clean out the queue */
+	memset(crq->msgs, 0, PAGE_SIZE);
+	crq->cur = 0;
+
+	/* And re-open it again */
+	rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
+				crq->msg_token, PAGE_SIZE);
+
+	if (rc == H_CLOSED)
+		/* Adapter is good, but other end is not ready */
+		dev_warn(vhost->dev, "Partner adapter not ready\n");
+	else if (rc != 0)
+		dev_warn(vhost->dev, "Couldn't register crq (rc=%d)\n", rc);
+
+	return rc;
+}
+
+/**
+ * ibmvfc_valid_event - Determines if event is valid.
+ * @pool:	event_pool that contains the event
+ * @evt:	ibmvfc event to be checked for validity
+ *
+ * Return value:
+ *	1 if event is valid / 0 if event is not valid
+ **/
+static int ibmvfc_valid_event(struct ibmvfc_event_pool *pool,
+			      struct ibmvfc_event *evt)
+{
+	int index = evt - pool->events;
+	if (index < 0 || index >= pool->size)	/* outside of bounds */
+		return 0;
+	if (evt != pool->events + index)	/* unaligned */
+		return 0;
+	return 1;
+}
+
+/**
+ * ibmvfc_free_event - Free the specified event
+ * @evt:	ibmvfc_event to be freed
+ *
+ **/
+static void ibmvfc_free_event(struct ibmvfc_event *evt)
+{
+	struct ibmvfc_host *vhost = evt->vhost;
+	struct ibmvfc_event_pool *pool = &vhost->pool;
+
+	BUG_ON(!ibmvfc_valid_event(pool, evt));
+	BUG_ON(atomic_inc_return(&evt->free) != 1);
+	list_add_tail(&evt->queue, &vhost->free);
+}
+
+/**
+ * ibmvfc_scsi_eh_done - EH done function for queuecommand commands
+ * @evt:	ibmvfc event struct
+ *
+ * This function does not setup any error status, that must be done
+ * before this function gets called.
+ **/
+static void ibmvfc_scsi_eh_done(struct ibmvfc_event *evt)
+{
+	struct scsi_cmnd *cmnd = evt->cmnd;
+
+	if (cmnd) {
+		scsi_dma_unmap(cmnd);
+		cmnd->scsi_done(cmnd);
+	}
+
+	ibmvfc_free_event(evt);
+}
+
+/**
+ * ibmvfc_fail_request - Fail request with specified error code
+ * @evt:		ibmvfc event struct
+ * @error_code:	error code to fail request with
+ *
+ * Return value:
+ *	none
+ **/
+static void ibmvfc_fail_request(struct ibmvfc_event *evt, int error_code)
+{
+	if (evt->cmnd) {
+		evt->cmnd->result = (error_code << 16);
+		evt->done = ibmvfc_scsi_eh_done;
+	} else
+		evt->xfer_iu->mad_common.status = IBMVFC_MAD_DRIVER_FAILED;
+
+	list_del(&evt->queue);
+	del_timer(&evt->timer);
+	ibmvfc_trc_end(evt);
+	evt->done(evt);
+}
+
+/**
+ * ibmvfc_purge_requests - Our virtual adapter just shut down. Purge any sent requests
+ * @vhost:		ibmvfc host struct
+ * @error_code:	error code to fail requests with
+ *
+ * Return value:
+ *	none
+ **/
+static void ibmvfc_purge_requests(struct ibmvfc_host *vhost, int error_code)
+{
+	struct ibmvfc_event *evt, *pos;
+
+	ibmvfc_dbg(vhost, "Purging all requests\n");
+	list_for_each_entry_safe(evt, pos, &vhost->sent, queue)
+		ibmvfc_fail_request(evt, error_code);
+}
+
+/**
+ * __ibmvfc_reset_host - Reset the connection to the server (no locking)
+ * @vhost:	struct ibmvfc host to reset
+ **/
+static void __ibmvfc_reset_host(struct ibmvfc_host *vhost)
+{
+	int rc;
+
+	scsi_block_requests(vhost->host);
+	ibmvfc_purge_requests(vhost, DID_ERROR);
+	if ((rc = ibmvfc_reset_crq(vhost)) ||
+	    (rc = ibmvfc_send_crq_init(vhost)) ||
+	    (rc = vio_enable_interrupts(to_vio_dev(vhost->dev)))) {
+		dev_err(vhost->dev, "Error after reset rc=%d\n", rc);
+		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
+	} else
+		ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
+}
+
+/**
+ * ibmvfc_reset_host - Reset the connection to the server
+ * @vhost:	struct ibmvfc host to reset
+ **/
+static void ibmvfc_reset_host(struct ibmvfc_host *vhost)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(vhost->host->host_lock, flags);
+	__ibmvfc_reset_host(vhost);
+	spin_unlock_irqrestore(vhost->host->host_lock, flags);
+}
+
+/**
+ * ibmvfc_retry_host_init - Retry host initialization if allowed
+ * @vhost:	ibmvfc host struct
+ *
+ **/
+static void ibmvfc_retry_host_init(struct ibmvfc_host *vhost)
+{
+	if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
+		if (++vhost->init_retries > IBMVFC_MAX_INIT_RETRIES) {
+			dev_err(vhost->dev,
+				"Host initialization retries exceeded. Taking adapter offline\n");
+			ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
+		} else if (vhost->init_retries == IBMVFC_MAX_INIT_RETRIES)
+			__ibmvfc_reset_host(vhost);
+		else
+			ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
+	}
+
+	wake_up(&vhost->work_wait_q);
+}
+
+/**
+ * __ibmvfc_find_target - Find the specified scsi_target (no locking)
+ * @starget:	scsi target struct
+ *
+ * Return value:
+ *	ibmvfc_target struct / NULL if not found
+ **/
+static struct ibmvfc_target *__ibmvfc_find_target(struct scsi_target *starget)
+{
+	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
+	struct ibmvfc_host *vhost = shost_priv(shost);
+	struct ibmvfc_target *tgt;
+
+	list_for_each_entry(tgt, &vhost->targets, queue)
+		if (tgt->target_id == starget->id)
+			return tgt;
+	return NULL;
+}
+
+/**
+ * ibmvfc_find_target - Find the specified scsi_target
+ * @starget:	scsi target struct
+ *
+ * Return value:
+ *	ibmvfc_target struct / NULL if not found
+ **/
+static struct ibmvfc_target *ibmvfc_find_target(struct scsi_target *starget)
+{
+	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
+	struct ibmvfc_target *tgt;
+	unsigned long flags;
+
+	spin_lock_irqsave(shost->host_lock, flags);
+	tgt = __ibmvfc_find_target(starget);
+	spin_unlock_irqrestore(shost->host_lock, flags);
+	return tgt;
+}
+
+/**
+ * ibmvfc_get_host_speed - Get host port speed
+ * @shost:		scsi host struct
+ *
+ * Return value:
+ * 	none
+ **/
+static void ibmvfc_get_host_speed(struct Scsi_Host *shost)
+{
+	struct ibmvfc_host *vhost = shost_priv(shost);
+	unsigned long flags;
+
+	spin_lock_irqsave(shost->host_lock, flags);
+	if (vhost->state == IBMVFC_ACTIVE) {
+		switch(vhost->login_buf->resp.link_speed / 100) {
+		case 1:
+			fc_host_speed(shost) = FC_PORTSPEED_1GBIT;
+			break;
+		case 2:
+			fc_host_speed(shost) = FC_PORTSPEED_2GBIT;
+			break;
+		case 4:
+			fc_host_speed(shost) = FC_PORTSPEED_4GBIT;
+			break;
+		case 8:
+			fc_host_speed(shost) = FC_PORTSPEED_8GBIT;
+			break;
+		case 10:
+			fc_host_speed(shost) = FC_PORTSPEED_10GBIT;
+			break;
+		case 16:
+			fc_host_speed(shost) = FC_PORTSPEED_16GBIT;
+			break;
+		default:
+			ibmvfc_log(vhost, 3, "Unknown port speed: %ld Gbit\n",
+				   vhost->login_buf->resp.link_speed / 100);
+			fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
+			break;
+		}
+	} else
+		fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
+	spin_unlock_irqrestore(shost->host_lock, flags);
+}
+
+/**
+ * ibmvfc_get_host_port_state - Get host port state
+ * @shost:		scsi host struct
+ *
+ * Return value:
+ * 	none
+ **/
+static void ibmvfc_get_host_port_state(struct Scsi_Host *shost)
+{
+	struct ibmvfc_host *vhost = shost_priv(shost);
+	unsigned long flags;
+
+	spin_lock_irqsave(shost->host_lock, flags);
+	switch (vhost->state) {
+	case IBMVFC_INITIALIZING:
+	case IBMVFC_ACTIVE:
+		fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
+		break;
+	case IBMVFC_LINK_DOWN:
+		fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
+		break;
+	case IBMVFC_LINK_DEAD:
+	case IBMVFC_HOST_OFFLINE:
+		fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;
+		break;
+	case IBMVFC_HALTED:
+		fc_host_port_state(shost) = FC_PORTSTATE_BLOCKED;
+		break;
+	default:
+		ibmvfc_log(vhost, 3, "Unknown port state: %d\n", vhost->state);
+		fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
+		break;
+	}
+	spin_unlock_irqrestore(shost->host_lock, flags);
+}
+
+/**
+ * ibmvfc_set_rport_dev_loss_tmo - Set rport's device loss timeout
+ * @rport:		rport struct
+ * @timeout:	timeout value
+ *
+ * Return value:
+ * 	none
+ **/
+static void ibmvfc_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
+{
+	if (timeout)
+		rport->dev_loss_tmo = timeout;
+	else
+		rport->dev_loss_tmo = 1;
+}
+
+/**
+ * ibmvfc_get_starget_node_name - Get SCSI target's node name
+ * @starget:	scsi target struct
+ *
+ * Return value:
+ * 	none
+ **/
+static void ibmvfc_get_starget_node_name(struct scsi_target *starget)
+{
+	struct ibmvfc_target *tgt = ibmvfc_find_target(starget);
+	fc_starget_port_name(starget) = tgt ? tgt->ids.node_name : 0;
+}
+
+/**
+ * ibmvfc_get_starget_port_name - Get SCSI target's port name
+ * @starget:	scsi target struct
+ *
+ * Return value:
+ * 	none
+ **/
+static void ibmvfc_get_starget_port_name(struct scsi_target *starget)
+{
+	struct ibmvfc_target *tgt = ibmvfc_find_target(starget);
+	fc_starget_port_name(starget) = tgt ? tgt->ids.port_name : 0;
+}
+
+/**
+ * ibmvfc_get_starget_port_id - Get SCSI target's port ID
+ * @starget:	scsi target struct
+ *
+ * Return value:
+ * 	none
+ **/
+static void ibmvfc_get_starget_port_id(struct scsi_target *starget)
+{
+	struct ibmvfc_target *tgt = ibmvfc_find_target(starget);
+	fc_starget_port_id(starget) = tgt ? tgt->scsi_id : -1;
+}
+
+/**
+ * ibmvfc_wait_while_resetting - Wait while the host resets
+ * @vhost:		ibmvfc host struct
+ *
+ * Return value:
+ * 	0 on success / other on failure
+ **/
+static int ibmvfc_wait_while_resetting(struct ibmvfc_host *vhost)
+{
+	long timeout = wait_event_timeout(vhost->init_wait_q,
+					  (vhost->state == IBMVFC_ACTIVE ||
+					   vhost->state == IBMVFC_HOST_OFFLINE ||
+					   vhost->state == IBMVFC_LINK_DEAD),
+					  (init_timeout * HZ));
+
+	return timeout ? 0 : -EIO;
+}
+
+/**
+ * ibmvfc_issue_fc_host_lip - Re-initiate link initialization
+ * @shost:		scsi host struct
+ *
+ * Return value:
+ * 	0 on success / other on failure
+ **/
+static int ibmvfc_issue_fc_host_lip(struct Scsi_Host *shost)
+{
+	struct ibmvfc_host *vhost = shost_priv(shost);
+
+	dev_err(vhost->dev, "Initiating host LIP. Resetting connection\n");
+	ibmvfc_reset_host(vhost);
+	return ibmvfc_wait_while_resetting(vhost);
+}
+
+/**
+ * ibmvfc_gather_partition_info - Gather info about the LPAR
+ *
+ * Return value:
+ *	none
+ **/
+static void ibmvfc_gather_partition_info(struct ibmvfc_host *vhost)
+{
+	struct device_node *rootdn;
+	const char *name;
+	const unsigned int *num;
+
+	rootdn = of_find_node_by_path("/");
+	if (!rootdn)
+		return;
+
+	name = of_get_property(rootdn, "ibm,partition-name", NULL);
+	if (name)
+		strncpy(vhost->partition_name, name, sizeof(vhost->partition_name));
+	num = of_get_property(rootdn, "ibm,partition-no", NULL);
+	if (num)
+		vhost->partition_number = *num;
+	of_node_put(rootdn);
+}
+
+/**
+ * ibmvfc_set_login_info - Setup info for NPIV login
+ * @vhost:	ibmvfc host struct
+ *
+ * Return value:
+ *	none
+ **/
+static void ibmvfc_set_login_info(struct ibmvfc_host *vhost)
+{
+	struct ibmvfc_npiv_login *login_info = &vhost->login_info;
+
+	memset(login_info, 0, sizeof(*login_info));
+
+	login_info->ostype = IBMVFC_OS_LINUX;
+	login_info->max_dma_len = IBMVFC_MAX_SECTORS << 9;
+	login_info->max_payload = sizeof(struct ibmvfc_fcp_cmd_iu);
+	login_info->max_response = sizeof(struct ibmvfc_fcp_rsp);
+	login_info->partition_num = vhost->partition_number;
+	login_info->vfc_frame_version = 1;
+	login_info->fcp_version = 3;
+	if (vhost->client_migrated)
+		login_info->flags = IBMVFC_CLIENT_MIGRATED;
+
+	login_info->max_cmds = max_requests + IBMVFC_NUM_INTERNAL_REQ;
+	login_info->capabilities = IBMVFC_CAN_MIGRATE;
+	login_info->async.va = vhost->async_crq.msg_token;
+	login_info->async.len = vhost->async_crq.size;
+	strncpy(login_info->partition_name, vhost->partition_name, IBMVFC_MAX_NAME);
+	strncpy(login_info->device_name,
+		vhost->host->shost_gendev.bus_id, IBMVFC_MAX_NAME);
+	strncpy(login_info->drc_name, vhost->dev->bus_id, IBMVFC_MAX_NAME);
+}
+
+/**
+ * ibmvfc_init_event_pool - Allocates and initializes the event pool for a host
+ * @vhost:	ibmvfc host who owns the event pool
+ *
+ * Returns zero on success.
+ **/
+static int ibmvfc_init_event_pool(struct ibmvfc_host *vhost)
+{
+	int i;
+	struct ibmvfc_event_pool *pool = &vhost->pool;
+
+	ENTER;
+	pool->size = max_requests + IBMVFC_NUM_INTERNAL_REQ;
+	pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
+	if (!pool->events)
+		return -ENOMEM;
+
+	pool->iu_storage = dma_alloc_coherent(vhost->dev,
+					      pool->size * sizeof(*pool->iu_storage),
+					      &pool->iu_token, 0);
+
+	if (!pool->iu_storage) {
+		kfree(pool->events);
+		return -ENOMEM;
+	}
+
+	for (i = 0; i < pool->size; ++i) {
+		struct ibmvfc_event *evt = &pool->events[i];
+		atomic_set(&evt->free, 1);
+		evt->crq.valid = 0x80;
+		evt->crq.ioba = pool->iu_token + (sizeof(*evt->xfer_iu) * i);
+		evt->xfer_iu = pool->iu_storage + i;
+		evt->vhost = vhost;
+		evt->ext_list = NULL;
+		list_add_tail(&evt->queue, &vhost->free);
+	}
+
+	LEAVE;
+	return 0;
+}
+
+/**
+ * ibmvfc_free_event_pool - Frees memory of the event pool of a host
+ * @vhost:	ibmvfc host who owns the event pool
+ *
+ **/
+static void ibmvfc_free_event_pool(struct ibmvfc_host *vhost)
+{
+	int i;
+	struct ibmvfc_event_pool *pool = &vhost->pool;
+
+	ENTER;
+	for (i = 0; i < pool->size; ++i) {
+		list_del(&pool->events[i].queue);
+		BUG_ON(atomic_read(&pool->events[i].free) != 1);
+		if (pool->events[i].ext_list)
+			dma_pool_free(vhost->sg_pool,
+				      pool->events[i].ext_list,
+				      pool->events[i].ext_list_token);
+	}
+
+	kfree(pool->events);
+	dma_free_coherent(vhost->dev,
+			  pool->size * sizeof(*pool->iu_storage),
+			  pool->iu_storage, pool->iu_token);
+	LEAVE;
+}
+
+/**
+ * ibmvfc_get_event - Gets the next free event in pool
+ * @vhost:	ibmvfc host struct
+ *
+ * Returns a free event from the pool.
+ **/
+static struct ibmvfc_event *ibmvfc_get_event(struct ibmvfc_host *vhost)
+{
+	struct ibmvfc_event *evt;
+
+	BUG_ON(list_empty(&vhost->free));
+	evt = list_entry(vhost->free.next, struct ibmvfc_event, queue);
+	atomic_set(&evt->free, 0);
+	list_del(&evt->queue);
+	return evt;
+}
+
+/**
+ * ibmvfc_init_event - Initialize fields in an event struct that are always
+ *				required.
+ * @evt:	The event
+ * @done:	Routine to call when the event is responded to
+ * @format:	SRP or MAD format
+ **/
+static void ibmvfc_init_event(struct ibmvfc_event *evt,
+			      void (*done) (struct ibmvfc_event *), u8 format)
+{
+	evt->cmnd = NULL;
+	evt->sync_iu = NULL;
+	evt->crq.format = format;
+	evt->done = done;
+}
+
+/**
+ * ibmvfc_map_sg_list - Initialize scatterlist
+ * @scmd:	scsi command struct
+ * @nseg:	number of scatterlist segments
+ * @md:	memory descriptor list to initialize
+ **/
+static void ibmvfc_map_sg_list(struct scsi_cmnd *scmd, int nseg,
+			       struct srp_direct_buf *md)
+{
+	int i;
+	struct scatterlist *sg;
+
+	scsi_for_each_sg(scmd, sg, nseg, i) {
+		md[i].va = sg_dma_address(sg);
+		md[i].len = sg_dma_len(sg);
+		md[i].key = 0;
+	}
+}
+
+/**
+ * ibmvfc_map_sg_data - Maps dma for a scatterlist and initializes decriptor fields
+ * @scmd:		Scsi_Cmnd with the scatterlist
+ * @evt:		ibmvfc event struct
+ * @vfc_cmd:	vfc_cmd that contains the memory descriptor
+ * @dev:		device for which to map dma memory
+ *
+ * Returns:
+ *	0 on success / non-zero on failure
+ **/
+static int ibmvfc_map_sg_data(struct scsi_cmnd *scmd,
+			      struct ibmvfc_event *evt,
+			      struct ibmvfc_cmd *vfc_cmd, struct device *dev)
+{
+
+	int sg_mapped;
+	struct srp_direct_buf *data = &vfc_cmd->ioba;
+	struct ibmvfc_host *vhost = dev_get_drvdata(dev);
+
+	sg_mapped = scsi_dma_map(scmd);
+	if (!sg_mapped) {
+		vfc_cmd->flags |= IBMVFC_NO_MEM_DESC;
+		return 0;
+	} else if (unlikely(sg_mapped < 0)) {
+		if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
+			scmd_printk(KERN_ERR, scmd, "Failed to map DMA buffer for command\n");
+		return sg_mapped;
+	}
+
+	if (scmd->sc_data_direction == DMA_TO_DEVICE) {
+		vfc_cmd->flags |= IBMVFC_WRITE;
+		vfc_cmd->iu.add_cdb_len |= IBMVFC_WRDATA;
+	} else {
+		vfc_cmd->flags |= IBMVFC_READ;
+		vfc_cmd->iu.add_cdb_len |= IBMVFC_RDDATA;
+	}
+
+	if (sg_mapped == 1) {
+		ibmvfc_map_sg_list(scmd, sg_mapped, data);
+		return 0;
+	}
+
+	vfc_cmd->flags |= IBMVFC_SCATTERLIST;
+
+	if (!evt->ext_list) {
+		evt->ext_list = dma_pool_alloc(vhost->sg_pool, GFP_ATOMIC,
+					       &evt->ext_list_token);
+
+		if (!evt->ext_list) {
+			scmd_printk(KERN_ERR, scmd, "Can't allocate memory for scatterlist\n");
+			return -ENOMEM;
+		}
+	}
+
+	ibmvfc_map_sg_list(scmd, sg_mapped, evt->ext_list);
+
+	data->va = evt->ext_list_token;
+	data->len = sg_mapped * sizeof(struct srp_direct_buf);
+	data->key = 0;
+ 	return 0;
+}
+
+/**
+ * ibmvfc_timeout - Internal command timeout handler
+ * @evt:	struct ibmvfc_event that timed out
+ *
+ * Called when an internally generated command times out
+ **/
+static void ibmvfc_timeout(struct ibmvfc_event *evt)
+{
+	struct ibmvfc_host *vhost = evt->vhost;
+	dev_err(vhost->dev, "Command timed out (%p). Resetting connection\n", evt);
+	ibmvfc_reset_host(vhost);
+}
+
+/**
+ * ibmvfc_send_event - Transforms event to u64 array and calls send_crq()
+ * @evt:		event to be sent
+ * @vhost:		ibmvfc host struct
+ * @timeout:	timeout in seconds - 0 means do not time command
+ *
+ * Returns the value returned from ibmvfc_send_crq(). (Zero for success)
+ **/
+static int ibmvfc_send_event(struct ibmvfc_event *evt,
+			     struct ibmvfc_host *vhost, unsigned long timeout)
+{
+	u64 *crq_as_u64 = (u64 *) &evt->crq;
+	int rc;
+
+	/* Copy the IU into the transfer area */
+	*evt->xfer_iu = evt->iu;
+	if (evt->crq.format == IBMVFC_CMD_FORMAT)
+		evt->xfer_iu->cmd.tag = (u64)evt;
+	else if (evt->crq.format == IBMVFC_MAD_FORMAT)
+		evt->xfer_iu->mad_common.tag = (u64)evt;
+	else
+		BUG();
+
+	list_add_tail(&evt->queue, &vhost->sent);
+	init_timer(&evt->timer);
+
+	if (timeout) {
+		evt->timer.data = (unsigned long) evt;
+		evt->timer.expires = jiffies + (timeout * HZ);
+		evt->timer.function = (void (*)(unsigned long))ibmvfc_timeout;
+		add_timer(&evt->timer);
+	}
+
+	if ((rc = ibmvfc_send_crq(vhost, crq_as_u64[0], crq_as_u64[1]))) {
+		list_del(&evt->queue);
+		del_timer(&evt->timer);
+
+		/* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
+		 * Firmware will send a CRQ with a transport event (0xFF) to
+		 * tell this client what has happened to the transport. This
+		 * will be handled in ibmvfc_handle_crq()
+		 */
+		if (rc == H_CLOSED) {
+			if (printk_ratelimit())
+				dev_warn(vhost->dev, "Send warning. Receive queue closed, will retry.\n");
+			if (evt->cmnd)
+				scsi_dma_unmap(evt->cmnd);
+			ibmvfc_free_event(evt);
+			return SCSI_MLQUEUE_HOST_BUSY;
+		}
+
+		dev_err(vhost->dev, "Send error (rc=%d)\n", rc);
+		if (evt->cmnd) {
+			evt->cmnd->result = DID_ERROR << 16;
+			evt->done = ibmvfc_scsi_eh_done;
+		} else
+			evt->xfer_iu->mad_common.status = IBMVFC_MAD_CRQ_ERROR;
+
+		evt->done(evt);
+	} else
+		ibmvfc_trc_start(evt);
+
+	return 0;
+}
+
+/**
+ * ibmvfc_log_error - Log an error for the failed command if appropriate
+ * @evt:	ibmvfc event to log
+ *
+ **/
+static void ibmvfc_log_error(struct ibmvfc_event *evt)
+{
+	struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
+	struct ibmvfc_host *vhost = evt->vhost;
+	struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
+	struct scsi_cmnd *cmnd = evt->cmnd;
+	const char *err = unknown_error;
+	int index = ibmvfc_get_err_index(vfc_cmd->status, vfc_cmd->error);
+	int logerr = 0;
+	int rsp_code = 0;
+
+	if (index >= 0) {
+		logerr = cmd_status[index].log;
+		err = cmd_status[index].name;
+	}
+
+	if (!logerr && (vhost->log_level <= IBMVFC_DEFAULT_LOG_LEVEL))
+		return;
+
+	if (rsp->flags & FCP_RSP_LEN_VALID)
+		rsp_code = rsp->data.info.rsp_code;
+
+	scmd_printk(KERN_ERR, cmnd, "Command (%02X) failed: %s (%x:%x) "
+		    "flags: %x fcp_rsp: %x, resid=%d, scsi_status: %x\n",
+		    cmnd->cmnd[0], err, vfc_cmd->status, vfc_cmd->error,
+		    rsp->flags, rsp_code, scsi_get_resid(cmnd), rsp->scsi_status);
+}
+
+/**
+ * ibmvfc_scsi_done - Handle responses from commands
+ * @evt:	ibmvfc event to be handled
+ *
+ * Used as a callback when sending scsi cmds.
+ **/
+static void ibmvfc_scsi_done(struct ibmvfc_event *evt)
+{
+	struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
+	struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
+	struct scsi_cmnd *cmnd = evt->cmnd;
+	int rsp_len = 0;
+	int sense_len = rsp->fcp_sense_len;
+
+	if (cmnd) {
+		if (vfc_cmd->response_flags & IBMVFC_ADAPTER_RESID_VALID)
+			scsi_set_resid(cmnd, vfc_cmd->adapter_resid);
+		else if (rsp->flags & FCP_RESID_UNDER)
+			scsi_set_resid(cmnd, rsp->fcp_resid);
+		else
+			scsi_set_resid(cmnd, 0);
+
+		if (vfc_cmd->status) {
+			cmnd->result = ibmvfc_get_err_result(vfc_cmd);
+
+			if (rsp->flags & FCP_RSP_LEN_VALID)
+				rsp_len = rsp->fcp_rsp_len;
+			if ((sense_len + rsp_len) > SCSI_SENSE_BUFFERSIZE)
+				sense_len = SCSI_SENSE_BUFFERSIZE - rsp_len;
+			if ((rsp->flags & FCP_SNS_LEN_VALID) && rsp->fcp_sense_len)
+				memcpy(cmnd->sense_buffer, rsp->data.sense + rsp_len, sense_len);
+
+			ibmvfc_log_error(evt);
+		}
+
+		if (!cmnd->result &&
+		    (scsi_bufflen(cmnd) - scsi_get_resid(cmnd) < cmnd->underflow))
+			cmnd->result = (DID_ERROR << 16);
+
+		scsi_dma_unmap(cmnd);
+		cmnd->scsi_done(cmnd);
+	}
+
+	ibmvfc_free_event(evt);
+}
+
+/**
+ * ibmvfc_host_chkready - Check if the host can accept commands
+ * @vhost:	 struct ibmvfc host
+ *
+ * Returns:
+ *	1 if host can accept command / 0 if not
+ **/
+static inline int ibmvfc_host_chkready(struct ibmvfc_host *vhost)
+{
+	int result = 0;
+
+	switch (vhost->state) {
+	case IBMVFC_LINK_DEAD:
+	case IBMVFC_HOST_OFFLINE:
+		result = DID_NO_CONNECT << 16;
+		break;
+	case IBMVFC_NO_CRQ:
+	case IBMVFC_INITIALIZING:
+	case IBMVFC_HALTED:
+	case IBMVFC_LINK_DOWN:
+		result = DID_REQUEUE << 16;
+		break;
+	case IBMVFC_ACTIVE:
+		result = 0;
+		break;
+	};
+
+	return result;
+}
+
+/**
+ * ibmvfc_queuecommand - The queuecommand function of the scsi template
+ * @cmnd:	struct scsi_cmnd to be executed
+ * @done:	Callback function to be called when cmnd is completed
+ *
+ * Returns:
+ *	0 on success / other on failure
+ **/
+static int ibmvfc_queuecommand(struct scsi_cmnd *cmnd,
+			       void (*done) (struct scsi_cmnd *))
+{
+	struct ibmvfc_host *vhost = shost_priv(cmnd->device->host);
+	struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
+	struct ibmvfc_cmd *vfc_cmd;
+	struct ibmvfc_event *evt;
+	u8 tag[2];
+	int rc;
+
+	if (unlikely((rc = fc_remote_port_chkready(rport))) ||
+	    unlikely((rc = ibmvfc_host_chkready(vhost)))) {
+		cmnd->result = rc;
+		done(cmnd);
+		return 0;
+	}
+
+	cmnd->result = (DID_OK << 16);
+	evt = ibmvfc_get_event(vhost);
+	ibmvfc_init_event(evt, ibmvfc_scsi_done, IBMVFC_CMD_FORMAT);
+	evt->cmnd = cmnd;
+	cmnd->scsi_done = done;
+	vfc_cmd = &evt->iu.cmd;
+	memset(vfc_cmd, 0, sizeof(*vfc_cmd));
+	vfc_cmd->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp);
+	vfc_cmd->resp.len = sizeof(vfc_cmd->rsp);
+	vfc_cmd->frame_type = IBMVFC_SCSI_FCP_TYPE;
+	vfc_cmd->payload_len = sizeof(vfc_cmd->iu);
+	vfc_cmd->resp_len = sizeof(vfc_cmd->rsp);
+	vfc_cmd->cancel_key = (unsigned long)cmnd->device->hostdata;
+	vfc_cmd->tgt_scsi_id = rport->port_id;
+	if ((rport->supported_classes & FC_COS_CLASS3) &&
+	    (fc_host_supported_classes(vhost->host) & FC_COS_CLASS3))
+		vfc_cmd->flags = IBMVFC_CLASS_3_ERR;
+	vfc_cmd->iu.xfer_len = scsi_bufflen(cmnd);
+	int_to_scsilun(cmnd->device->lun, &vfc_cmd->iu.lun);
+	memcpy(vfc_cmd->iu.cdb, cmnd->cmnd, cmnd->cmd_len);
+
+	if (scsi_populate_tag_msg(cmnd, tag)) {
+		vfc_cmd->task_tag = tag[1];
+		switch (tag[0]) {
+		case MSG_SIMPLE_TAG:
+			vfc_cmd->iu.pri_task_attr = IBMVFC_SIMPLE_TASK;
+			break;
+		case MSG_HEAD_TAG:
+			vfc_cmd->iu.pri_task_attr = IBMVFC_HEAD_OF_QUEUE;
+			break;
+		case MSG_ORDERED_TAG:
+			vfc_cmd->iu.pri_task_attr = IBMVFC_ORDERED_TASK;
+			break;
+		};
+	}
+
+	if (likely(!(rc = ibmvfc_map_sg_data(cmnd, evt, vfc_cmd, vhost->dev))))
+		return ibmvfc_send_event(evt, vhost, 0);
+
+	ibmvfc_free_event(evt);
+	if (rc == -ENOMEM)
+		return SCSI_MLQUEUE_HOST_BUSY;
+
+	if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
+		scmd_printk(KERN_ERR, cmnd,
+			    "Failed to map DMA buffer for command. rc=%d\n", rc);
+
+	cmnd->result = DID_ERROR << 16;
+	done(cmnd);
+	return 0;
+}
+
+/**
+ * ibmvfc_sync_completion - Signal that a synchronous command has completed
+ * @evt:	ibmvfc event struct
+ *
+ **/
+static void ibmvfc_sync_completion(struct ibmvfc_event *evt)
+{
+	/* copy the response back */
+	if (evt->sync_iu)
+		*evt->sync_iu = *evt->xfer_iu;
+
+	complete(&evt->comp);
+}
+
+/**
+ * ibmvfc_reset_device - Reset the device with the specified reset type
+ * @sdev:	scsi device to reset
+ * @type:	reset type
+ * @desc:	reset type description for log messages
+ *
+ * Returns:
+ *	0 on success / other on failure
+ **/
+static int ibmvfc_reset_device(struct scsi_device *sdev, int type, char *desc)
+{
+	struct ibmvfc_host *vhost = shost_priv(sdev->host);
+	struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
+	struct ibmvfc_cmd *tmf;
+	struct ibmvfc_event *evt;
+	union ibmvfc_iu rsp_iu;
+	struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
+	int rsp_rc = -EBUSY;
+	unsigned long flags;
+	int rsp_code = 0;
+
+	spin_lock_irqsave(vhost->host->host_lock, flags);
+	if (vhost->state == IBMVFC_ACTIVE) {
+		evt = ibmvfc_get_event(vhost);
+		ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
+
+		tmf = &evt->iu.cmd;
+		memset(tmf, 0, sizeof(*tmf));
+		tmf->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp);
+		tmf->resp.len = sizeof(tmf->rsp);
+		tmf->frame_type = IBMVFC_SCSI_FCP_TYPE;
+		tmf->payload_len = sizeof(tmf->iu);
+		tmf->resp_len = sizeof(tmf->rsp);
+		tmf->cancel_key = (unsigned long)sdev->hostdata;
+		tmf->tgt_scsi_id = rport->port_id;
+		int_to_scsilun(sdev->lun, &tmf->iu.lun);
+		tmf->flags = (IBMVFC_NO_MEM_DESC | IBMVFC_TMF);
+		tmf->iu.tmf_flags = type;
+		evt->sync_iu = &rsp_iu;
+
+		init_completion(&evt->comp);
+		rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
+	}
+	spin_unlock_irqrestore(vhost->host->host_lock, flags);
+
+	if (rsp_rc != 0) {
+		sdev_printk(KERN_ERR, sdev, "Failed to send %s reset event. rc=%d\n",
+			    desc, rsp_rc);
+		return -EIO;
+	}
+
+	sdev_printk(KERN_INFO, sdev, "Resetting %s\n", desc);
+	wait_for_completion(&evt->comp);
+
+	if (rsp_iu.cmd.status) {
+		if (fc_rsp->flags & FCP_RSP_LEN_VALID)
+			rsp_code = fc_rsp->data.info.rsp_code;
+
+		sdev_printk(KERN_ERR, sdev, "%s reset failed: %s (%x:%x) "
+			    "flags: %x fcp_rsp: %x, scsi_status: %x\n",
+			    desc, ibmvfc_get_cmd_error(rsp_iu.cmd.status, rsp_iu.cmd.error),
+			    rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code,
+			    fc_rsp->scsi_status);
+		rsp_rc = -EIO;
+	} else
+		sdev_printk(KERN_INFO, sdev, "%s reset successful\n", desc);
+
+	spin_lock_irqsave(vhost->host->host_lock, flags);
+	ibmvfc_free_event(evt);
+	spin_unlock_irqrestore(vhost->host->host_lock, flags);
+	return rsp_rc;
+}
+
+/**
+ * ibmvfc_abort_task_set - Abort outstanding commands to the device
+ * @sdev:	scsi device to abort commands
+ *
+ * This sends an Abort Task Set to the VIOS for the specified device. This does
+ * NOT send any cancel to the VIOS. That must be done separately.
+ *
+ * Returns:
+ *	0 on success / other on failure
+ **/
+static int ibmvfc_abort_task_set(struct scsi_device *sdev)
+{
+	struct ibmvfc_host *vhost = shost_priv(sdev->host);
+	struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
+	struct ibmvfc_cmd *tmf;
+	struct ibmvfc_event *evt, *found_evt;
+	union ibmvfc_iu rsp_iu;
+	struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
+	int rsp_rc = -EBUSY;
+	unsigned long flags;
+	int rsp_code = 0;
+
+	spin_lock_irqsave(vhost->host->host_lock, flags);
+	found_evt = NULL;
+	list_for_each_entry(evt, &vhost->sent, queue) {
+		if (evt->cmnd && evt->cmnd->device == sdev) {
+			found_evt = evt;
+			break;
+		}
+	}
+
+	if (!found_evt) {
+		if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
+			sdev_printk(KERN_INFO, sdev, "No events found to abort\n");
+		spin_unlock_irqrestore(vhost->host->host_lock, flags);
+		return 0;
+	}
+
+	if (vhost->state == IBMVFC_ACTIVE) {
+		evt = ibmvfc_get_event(vhost);
+		ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
+
+		tmf = &evt->iu.cmd;
+		memset(tmf, 0, sizeof(*tmf));
+		tmf->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp);
+		tmf->resp.len = sizeof(tmf->rsp);
+		tmf->frame_type = IBMVFC_SCSI_FCP_TYPE;
+		tmf->payload_len = sizeof(tmf->iu);
+		tmf->resp_len = sizeof(tmf->rsp);
+		tmf->cancel_key = (unsigned long)sdev->hostdata;
+		tmf->tgt_scsi_id = rport->port_id;
+		int_to_scsilun(sdev->lun, &tmf->iu.lun);
+		tmf->flags = (IBMVFC_NO_MEM_DESC | IBMVFC_TMF);
+		tmf->iu.tmf_flags = IBMVFC_ABORT_TASK_SET;
+		evt->sync_iu = &rsp_iu;
+
+		init_completion(&evt->comp);
+		rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
+	}
+
+	spin_unlock_irqrestore(vhost->host->host_lock, flags);
+
+	if (rsp_rc != 0) {
+		sdev_printk(KERN_ERR, sdev, "Failed to send abort. rc=%d\n", rsp_rc);
+		return -EIO;
+	}
+
+	sdev_printk(KERN_INFO, sdev, "Aborting outstanding commands\n");
+	wait_for_completion(&evt->comp);
+
+	if (rsp_iu.cmd.status) {
+		if (fc_rsp->flags & FCP_RSP_LEN_VALID)
+			rsp_code = fc_rsp->data.info.rsp_code;
+
+		sdev_printk(KERN_ERR, sdev, "Abort failed: %s (%x:%x) "
+			    "flags: %x fcp_rsp: %x, scsi_status: %x\n",
+			    ibmvfc_get_cmd_error(rsp_iu.cmd.status, rsp_iu.cmd.error),
+			    rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code,
+			    fc_rsp->scsi_status);
+		rsp_rc = -EIO;
+	} else
+		sdev_printk(KERN_INFO, sdev, "Abort successful\n");
+
+	spin_lock_irqsave(vhost->host->host_lock, flags);
+	ibmvfc_free_event(evt);
+	spin_unlock_irqrestore(vhost->host->host_lock, flags);
+	return rsp_rc;
+}
+
+/**
+ * ibmvfc_cancel_all - Cancel all outstanding commands to the device
+ * @sdev:	scsi device to cancel commands
+ * @type:	type of error recovery being performed
+ *
+ * This sends a cancel to the VIOS for the specified device. This does
+ * NOT send any abort to the actual device. That must be done separately.
+ *
+ * Returns:
+ *	0 on success / other on failure
+ **/
+static int ibmvfc_cancel_all(struct scsi_device *sdev, int type)
+{
+	struct ibmvfc_host *vhost = shost_priv(sdev->host);
+	struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
+	struct ibmvfc_tmf *tmf;
+	struct ibmvfc_event *evt, *found_evt;
+	union ibmvfc_iu rsp;
+	int rsp_rc = -EBUSY;
+	unsigned long flags;
+	u16 status;
+
+	ENTER;
+	spin_lock_irqsave(vhost->host->host_lock, flags);
+	found_evt = NULL;
+	list_for_each_entry(evt, &vhost->sent, queue) {
+		if (evt->cmnd && evt->cmnd->device == sdev) {
+			found_evt = evt;
+			break;
+		}
+	}
+
+	if (!found_evt) {
+		if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
+			sdev_printk(KERN_INFO, sdev, "No events found to cancel\n");
+		spin_unlock_irqrestore(vhost->host->host_lock, flags);
+		return 0;
+	}
+
+	if (vhost->state == IBMVFC_ACTIVE) {
+		evt = ibmvfc_get_event(vhost);
+		ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
+
+		tmf = &evt->iu.tmf;
+		memset(tmf, 0, sizeof(*tmf));
+		tmf->common.version = 1;
+		tmf->common.opcode = IBMVFC_TMF_MAD;
+		tmf->common.length = sizeof(*tmf);
+		tmf->scsi_id = rport->port_id;
+		int_to_scsilun(sdev->lun, &tmf->lun);
+		tmf->flags = (type | IBMVFC_TMF_LUA_VALID);
+		tmf->cancel_key = (unsigned long)sdev->hostdata;
+		tmf->my_cancel_key = (IBMVFC_TMF_CANCEL_KEY | (unsigned long)sdev->hostdata);
+
+		evt->sync_iu = &rsp;
+		init_completion(&evt->comp);
+		rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
+	}
+
+	spin_unlock_irqrestore(vhost->host->host_lock, flags);
+
+	if (rsp_rc != 0) {
+		sdev_printk(KERN_ERR, sdev, "Failed to send cancel event. rc=%d\n", rsp_rc);
+		return -EIO;
+	}
+
+	sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");
+
+	wait_for_completion(&evt->comp);
+	status = rsp.mad_common.status;
+	spin_lock_irqsave(vhost->host->host_lock, flags);
+	ibmvfc_free_event(evt);
+	spin_unlock_irqrestore(vhost->host->host_lock, flags);
+
+	if (status != IBMVFC_MAD_SUCCESS) {
+		sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%d\n", status);
+		return -EIO;
+	}
+
+	sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
+	return 0;
+}
+
+/**
+ * ibmvfc_eh_abort_handler - Abort a command
+ * @cmd:	scsi command to abort
+ *
+ * Returns:
+ *	SUCCESS / FAILED
+ **/
+static int ibmvfc_eh_abort_handler(struct scsi_cmnd *cmd)
+{
+	struct ibmvfc_host *vhost = shost_priv(cmd->device->host);
+	struct ibmvfc_event *evt, *pos;
+	int cancel_rc, abort_rc;
+	unsigned long flags;
+
+	ENTER;
+	ibmvfc_wait_while_resetting(vhost);
+	cancel_rc = ibmvfc_cancel_all(cmd->device, IBMVFC_TMF_ABORT_TASK_SET);
+	abort_rc = ibmvfc_abort_task_set(cmd->device);
+
+	if (!cancel_rc && !abort_rc) {
+		spin_lock_irqsave(vhost->host->host_lock, flags);
+		list_for_each_entry_safe(evt, pos, &vhost->sent, queue) {
+			if (evt->cmnd && evt->cmnd->device == cmd->device)
+				ibmvfc_fail_request(evt, DID_ABORT);
+		}
+		spin_unlock_irqrestore(vhost->host->host_lock, flags);
+		LEAVE;
+		return SUCCESS;
+	}
+
+	LEAVE;
+	return FAILED;
+}
+
+/**
+ * ibmvfc_eh_device_reset_handler - Reset a single LUN
+ * @cmd:	scsi command struct
+ *
+ * Returns:
+ *	SUCCESS / FAILED
+ **/
+static int ibmvfc_eh_device_reset_handler(struct scsi_cmnd *cmd)
+{
+	struct ibmvfc_host *vhost = shost_priv(cmd->device->host);
+	struct ibmvfc_event *evt, *pos;
+	int cancel_rc, reset_rc;
+	unsigned long flags;
+
+	ENTER;
+	ibmvfc_wait_while_resetting(vhost);
+	cancel_rc = ibmvfc_cancel_all(cmd->device, IBMVFC_TMF_LUN_RESET);
+	reset_rc = ibmvfc_reset_device(cmd->device, IBMVFC_LUN_RESET, "LUN");
+
+	if (!cancel_rc && !reset_rc) {
+		spin_lock_irqsave(vhost->host->host_lock, flags);
+		list_for_each_entry_safe(evt, pos, &vhost->sent, queue) {
+			if (evt->cmnd && evt->cmnd->device == cmd->device)
+				ibmvfc_fail_request(evt, DID_ABORT);
+		}
+		spin_unlock_irqrestore(vhost->host->host_lock, flags);
+		LEAVE;
+		return SUCCESS;
+	}
+
+	LEAVE;
+	return FAILED;
+}
+
+/**
+ * ibmvfc_dev_cancel_all - Device iterated cancel all function
+ * @sdev:	scsi device struct
+ * @data:	return code
+ *
+ **/
+static void ibmvfc_dev_cancel_all(struct scsi_device *sdev, void *data)
+{
+	unsigned long *rc = data;
+	*rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_TGT_RESET);
+}
+
+/**
+ * ibmvfc_dev_abort_all - Device iterated abort task set function
+ * @sdev:	scsi device struct
+ * @data:	return code
+ *
+ **/
+static void ibmvfc_dev_abort_all(struct scsi_device *sdev, void *data)
+{
+	unsigned long *rc = data;
+	*rc |= ibmvfc_abort_task_set(sdev);
+}
+
+/**
+ * ibmvfc_eh_target_reset_handler - Reset the target
+ * @cmd:	scsi command struct
+ *
+ * Returns:
+ *	SUCCESS / FAILED
+ **/
+static int ibmvfc_eh_target_reset_handler(struct scsi_cmnd *cmd)
+{
+	struct ibmvfc_host *vhost = shost_priv(cmd->device->host);
+	struct scsi_target *starget = scsi_target(cmd->device);
+	struct ibmvfc_event *evt, *pos;
+	int reset_rc;
+	unsigned long cancel_rc = 0;
+	unsigned long flags;
+
+	ENTER;
+	ibmvfc_wait_while_resetting(vhost);
+	starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all);
+	reset_rc = ibmvfc_reset_device(cmd->device, IBMVFC_TARGET_RESET, "target");
+
+	if (!cancel_rc && !reset_rc) {
+		spin_lock_irqsave(vhost->host->host_lock, flags);
+		list_for_each_entry_safe(evt, pos, &vhost->sent, queue) {
+			if (evt->cmnd && scsi_target(evt->cmnd->device) == starget)
+				ibmvfc_fail_request(evt, DID_ABORT);
+		}
+		spin_unlock_irqrestore(vhost->host->host_lock, flags);
+		LEAVE;
+		return SUCCESS;
+	}
+
+	LEAVE;
+	return FAILED;
+}
+
+/**
+ * ibmvfc_eh_host_reset_handler - Reset the connection to the server
+ * @cmd:	struct scsi_cmnd having problems
+ *
+ **/
+static int ibmvfc_eh_host_reset_handler(struct scsi_cmnd *cmd)
+{
+	int rc;
+	struct ibmvfc_host *vhost = shost_priv(cmd->device->host);
+
+	dev_err(vhost->dev, "Resetting connection due to error recovery\n");
+	rc = ibmvfc_issue_fc_host_lip(vhost->host);
+	return rc ? FAILED : SUCCESS;
+}
+
+/**
+ * ibmvfc_terminate_rport_io - Terminate all pending I/O to the rport.
+ * @rport:		rport struct
+ *
+ * Return value:
+ * 	none
+ **/
+static void ibmvfc_terminate_rport_io(struct fc_rport *rport)
+{
+	struct scsi_target *starget = to_scsi_target(&rport->dev);
+	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
+	struct ibmvfc_host *vhost = shost_priv(shost);
+	struct ibmvfc_event *evt, *pos;
+	unsigned long cancel_rc = 0;
+	unsigned long abort_rc = 0;
+	unsigned long flags;
+
+	ENTER;
+	starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all);
+	starget_for_each_device(starget, &abort_rc, ibmvfc_dev_abort_all);
+
+	if (!cancel_rc && !abort_rc) {
+		spin_lock_irqsave(shost->host_lock, flags);
+		list_for_each_entry_safe(evt, pos, &vhost->sent, queue) {
+			if (evt->cmnd && scsi_target(evt->cmnd->device) == starget)
+				ibmvfc_fail_request(evt, DID_ABORT);
+		}
+		spin_unlock_irqrestore(shost->host_lock, flags);
+	} else
+		ibmvfc_issue_fc_host_lip(shost);
+
+	scsi_target_unblock(&rport->dev);
+	LEAVE;
+}
+
+static const struct {
+	enum ibmvfc_async_event ae;
+	const char *desc;
+} ae_desc [] = {
+	{ IBMVFC_AE_ELS_PLOGI,		"PLOGI" },
+	{ IBMVFC_AE_ELS_LOGO,		"LOGO" },
+	{ IBMVFC_AE_ELS_PRLO,		"PRLO" },
+	{ IBMVFC_AE_SCN_NPORT,		"N-Port SCN" },
+	{ IBMVFC_AE_SCN_GROUP,		"Group SCN" },
+	{ IBMVFC_AE_SCN_DOMAIN,		"Domain SCN" },
+	{ IBMVFC_AE_SCN_FABRIC,		"Fabric SCN" },
+	{ IBMVFC_AE_LINK_UP,		"Link Up" },
+	{ IBMVFC_AE_LINK_DOWN,		"Link Down" },
+	{ IBMVFC_AE_LINK_DEAD,		"Link Dead" },
+	{ IBMVFC_AE_HALT,			"Halt" },
+	{ IBMVFC_AE_RESUME,		"Resume" },
+	{ IBMVFC_AE_ADAPTER_FAILED,	"Adapter Failed" },
+};
+
+static const char *unknown_ae = "Unknown async";
+
+/**
+ * ibmvfc_get_ae_desc - Get text description for async event
+ * @ae:	async event
+ *
+ **/
+static const char *ibmvfc_get_ae_desc(u64 ae)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(ae_desc); i++)
+		if (ae_desc[i].ae == ae)
+			return ae_desc[i].desc;
+
+	return unknown_ae;
+}
+
+/**
+ * ibmvfc_handle_async - Handle an async event from the adapter
+ * @crq:	crq to process
+ * @vhost:	ibmvfc host struct
+ *
+ **/
+static void ibmvfc_handle_async(struct ibmvfc_async_crq *crq,
+				struct ibmvfc_host *vhost)
+{
+	const char *desc = ibmvfc_get_ae_desc(crq->event);
+
+	ibmvfc_log(vhost, 2, "%s event received\n", desc);
+
+	switch (crq->event) {
+	case IBMVFC_AE_LINK_UP:
+	case IBMVFC_AE_RESUME:
+		vhost->events_to_log |= IBMVFC_AE_LINKUP;
+		ibmvfc_init_host(vhost);
+		break;
+	case IBMVFC_AE_SCN_FABRIC:
+		vhost->events_to_log |= IBMVFC_AE_RSCN;
+		ibmvfc_init_host(vhost);
+		break;
+	case IBMVFC_AE_SCN_NPORT:
+	case IBMVFC_AE_SCN_GROUP:
+	case IBMVFC_AE_SCN_DOMAIN:
+		vhost->events_to_log |= IBMVFC_AE_RSCN;
+	case IBMVFC_AE_ELS_LOGO:
+	case IBMVFC_AE_ELS_PRLO:
+	case IBMVFC_AE_ELS_PLOGI:
+		ibmvfc_reinit_host(vhost);
+		break;
+	case IBMVFC_AE_LINK_DOWN:
+	case IBMVFC_AE_ADAPTER_FAILED:
+		ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
+		break;
+	case IBMVFC_AE_LINK_DEAD:
+		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
+		break;
+	case IBMVFC_AE_HALT:
+		ibmvfc_link_down(vhost, IBMVFC_HALTED);
+		break;
+	default:
+		dev_err(vhost->dev, "Unknown async event received: %ld\n", crq->event);
+		break;
+	};
+}
+
+/**
+ * ibmvfc_handle_crq - Handles and frees received events in the CRQ
+ * @crq:	Command/Response queue
+ * @vhost:	ibmvfc host struct
+ *
+ **/
+static void ibmvfc_handle_crq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost)
+{
+	long rc;
+	struct ibmvfc_event *evt = (struct ibmvfc_event *)crq->ioba;
+
+	switch (crq->valid) {
+	case IBMVFC_CRQ_INIT_RSP:
+		switch (crq->format) {
+		case IBMVFC_CRQ_INIT:
+			dev_info(vhost->dev, "Partner initialized\n");
+			/* Send back a response */
+			rc = ibmvfc_send_crq_init_complete(vhost);
+			if (rc == 0)
+				ibmvfc_init_host(vhost);
+			else
+				dev_err(vhost->dev, "Unable to send init rsp. rc=%ld\n", rc);
+			break;
+		case IBMVFC_CRQ_INIT_COMPLETE:
+			dev_info(vhost->dev, "Partner initialization complete\n");
+			ibmvfc_init_host(vhost);
+			break;
+		default:
+			dev_err(vhost->dev, "Unknown crq message type: %d\n", crq->format);
+		}
+		return;
+	case IBMVFC_CRQ_XPORT_EVENT:
+		vhost->state = IBMVFC_NO_CRQ;
+		ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
+		if (crq->format == IBMVFC_PARTITION_MIGRATED) {
+			/* We need to re-setup the interpartition connection */
+			dev_info(vhost->dev, "Re-enabling adapter\n");
+			vhost->client_migrated = 1;
+			ibmvfc_purge_requests(vhost, DID_REQUEUE);
+			if ((rc = ibmvfc_reenable_crq_queue(vhost)) ||
+			    (rc = ibmvfc_send_crq_init(vhost))) {
+				ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
+				dev_err(vhost->dev, "Error after enable (rc=%ld)\n", rc);
+			} else
+				ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
+		} else {
+			dev_err(vhost->dev, "Virtual adapter failed (rc=%d)\n", crq->format);
+
+			ibmvfc_purge_requests(vhost, DID_ERROR);
+			if ((rc = ibmvfc_reset_crq(vhost)) ||
+			    (rc = ibmvfc_send_crq_init(vhost))) {
+				ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
+				dev_err(vhost->dev, "Error after reset (rc=%ld)\n", rc);
+			} else
+				ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
+		}
+		return;
+	case IBMVFC_CRQ_CMD_RSP:
+		break;
+	default:
+		dev_err(vhost->dev, "Got an invalid message type 0x%02x\n", crq->valid);
+		return;
+	}
+
+	if (crq->format == IBMVFC_ASYNC_EVENT)
+		return;
+
+	/* The only kind of payload CRQs we should get are responses to
+	 * things we send. Make sure this response is to something we
+	 * actually sent
+	 */
+	if (unlikely(!ibmvfc_valid_event(&vhost->pool, evt))) {
+		dev_err(vhost->dev, "Returned correlation_token 0x%08lx is invalid!\n",
+			crq->ioba);
+		return;
+	}
+
+	if (unlikely(atomic_read(&evt->free))) {
+		dev_err(vhost->dev, "Received duplicate correlation_token 0x%08lx!\n",
+			crq->ioba);
+		return;
+	}
+
+	del_timer(&evt->timer);
+	list_del(&evt->queue);
+	ibmvfc_trc_end(evt);
+	evt->done(evt);
+}
+
+/**
+ * ibmvfc_scan_finished - Check if the device scan is done.
+ * @shost:	scsi host struct
+ * @time:	current elapsed time
+ *
+ * Returns:
+ *	0 if scan is not done / 1 if scan is done
+ **/
+static int ibmvfc_scan_finished(struct Scsi_Host *shost, unsigned long time)
+{
+	unsigned long flags;
+	struct ibmvfc_host *vhost = shost_priv(shost);
+	int done = 0;
+
+	spin_lock_irqsave(shost->host_lock, flags);
+	if (time >= (init_timeout * HZ)) {
+		dev_info(vhost->dev, "Scan taking longer than %d seconds, "
+			 "continuing initialization\n", init_timeout);
+		done = 1;
+	}
+
+	if (vhost->state != IBMVFC_NO_CRQ && vhost->action == IBMVFC_HOST_ACTION_NONE)
+		done = 1;
+	spin_unlock_irqrestore(shost->host_lock, flags);
+	return done;
+}
+
+/**
+ * ibmvfc_slave_alloc - Setup the device's task set value
+ * @sdev:	struct scsi_device device to configure
+ *
+ * Set the device's task set value so that error handling works as
+ * expected.
+ *
+ * Returns:
+ *	0 on success / -ENXIO if device does not exist
+ **/
+static int ibmvfc_slave_alloc(struct scsi_device *sdev)
+{
+	struct Scsi_Host *shost = sdev->host;
+	struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
+	struct ibmvfc_host *vhost = shost_priv(shost);
+	unsigned long flags = 0;
+
+	if (!rport || fc_remote_port_chkready(rport))
+		return -ENXIO;
+
+	spin_lock_irqsave(shost->host_lock, flags);
+	sdev->hostdata = (void *)(unsigned long)vhost->task_set++;
+	spin_unlock_irqrestore(shost->host_lock, flags);
+	return 0;
+}
+
+/**
+ * ibmvfc_slave_configure - Configure the device
+ * @sdev:	struct scsi_device device to configure
+ *
+ * Enable allow_restart for a device if it is a disk. Adjust the
+ * queue_depth here also.
+ *
+ * Returns:
+ *	0
+ **/
+static int ibmvfc_slave_configure(struct scsi_device *sdev)
+{
+	struct Scsi_Host *shost = sdev->host;
+	struct fc_rport *rport = starget_to_rport(sdev->sdev_target);
+	unsigned long flags = 0;
+
+	spin_lock_irqsave(shost->host_lock, flags);
+	if (sdev->type == TYPE_DISK)
+		sdev->allow_restart = 1;
+
+	if (sdev->tagged_supported) {
+		scsi_set_tag_type(sdev, MSG_SIMPLE_TAG);
+		scsi_activate_tcq(sdev, sdev->queue_depth);
+	} else
+		scsi_deactivate_tcq(sdev, sdev->queue_depth);
+
+	rport->dev_loss_tmo = dev_loss_tmo;
+	spin_unlock_irqrestore(shost->host_lock, flags);
+	return 0;
+}
+
+/**
+ * ibmvfc_change_queue_depth - Change the device's queue depth
+ * @sdev:	scsi device struct
+ * @qdepth:	depth to set
+ *
+ * Return value:
+ * 	actual depth set
+ **/
+static int ibmvfc_change_queue_depth(struct scsi_device *sdev, int qdepth)
+{
+	if (qdepth > IBMVFC_MAX_CMDS_PER_LUN)
+		qdepth = IBMVFC_MAX_CMDS_PER_LUN;
+
+	scsi_adjust_queue_depth(sdev, 0, qdepth);
+	return sdev->queue_depth;
+}
+
+/**
+ * ibmvfc_change_queue_type - Change the device's queue type
+ * @sdev:		scsi device struct
+ * @tag_type:	type of tags to use
+ *
+ * Return value:
+ * 	actual queue type set
+ **/
+static int ibmvfc_change_queue_type(struct scsi_device *sdev, int tag_type)
+{
+	if (sdev->tagged_supported) {
+		scsi_set_tag_type(sdev, tag_type);
+
+		if (tag_type)
+			scsi_activate_tcq(sdev, sdev->queue_depth);
+		else
+			scsi_deactivate_tcq(sdev, sdev->queue_depth);
+	} else
+		tag_type = 0;
+
+	return tag_type;
+}
+
+static ssize_t ibmvfc_show_host_partition_name(struct device *dev,
+						 struct device_attribute *attr, char *buf)
+{
+	struct Scsi_Host *shost = class_to_shost(dev);
+	struct ibmvfc_host *vhost = shost_priv(shost);
+
+	return snprintf(buf, PAGE_SIZE, "%s\n",
+			vhost->login_buf->resp.partition_name);
+}
+
+static struct device_attribute ibmvfc_host_partition_name = {
+	.attr = {
+		.name = "partition_name",
+		.mode = S_IRUGO,
+	},
+	.show = ibmvfc_show_host_partition_name,
+};
+
+static ssize_t ibmvfc_show_host_device_name(struct device *dev,
+					    struct device_attribute *attr, char *buf)
+{
+	struct Scsi_Host *shost = class_to_shost(dev);
+	struct ibmvfc_host *vhost = shost_priv(shost);
+
+	return snprintf(buf, PAGE_SIZE, "%s\n",
+			vhost->login_buf->resp.device_name);
+}
+
+static struct device_attribute ibmvfc_host_device_name = {
+	.attr = {
+		.name = "device_name",
+		.mode = S_IRUGO,
+	},
+	.show = ibmvfc_show_host_device_name,
+};
+
+static ssize_t ibmvfc_show_host_loc_code(struct device *dev,
+					 struct device_attribute *attr, char *buf)
+{
+	struct Scsi_Host *shost = class_to_shost(dev);
+	struct ibmvfc_host *vhost = shost_priv(shost);
+
+	return snprintf(buf, PAGE_SIZE, "%s\n",
+			vhost->login_buf->resp.port_loc_code);
+}
+
+static struct device_attribute ibmvfc_host_loc_code = {
+	.attr = {
+		.name = "port_loc_code",
+		.mode = S_IRUGO,
+	},
+	.show = ibmvfc_show_host_loc_code,
+};
+
+static ssize_t ibmvfc_show_host_drc_name(struct device *dev,
+					 struct device_attribute *attr, char *buf)
+{
+	struct Scsi_Host *shost = class_to_shost(dev);
+	struct ibmvfc_host *vhost = shost_priv(shost);
+
+	return snprintf(buf, PAGE_SIZE, "%s\n",
+			vhost->login_buf->resp.drc_name);
+}
+
+static struct device_attribute ibmvfc_host_drc_name = {
+	.attr = {
+		.name = "drc_name",
+		.mode = S_IRUGO,
+	},
+	.show = ibmvfc_show_host_drc_name,
+};
+
+static ssize_t ibmvfc_show_host_npiv_version(struct device *dev,
+					     struct device_attribute *attr, char *buf)
+{
+	struct Scsi_Host *shost = class_to_shost(dev);
+	struct ibmvfc_host *vhost = shost_priv(shost);
+	return snprintf(buf, PAGE_SIZE, "%d\n", vhost->login_buf->resp.version);
+}
+
+static struct device_attribute ibmvfc_host_npiv_version = {
+	.attr = {
+		.name = "npiv_version",
+		.mode = S_IRUGO,
+	},
+	.show = ibmvfc_show_host_npiv_version,
+};
+
+/**
+ * ibmvfc_show_log_level - Show the adapter's error logging level
+ * @dev:	class device struct
+ * @buf:	buffer
+ *
+ * Return value:
+ * 	number of bytes printed to buffer
+ **/
+static ssize_t ibmvfc_show_log_level(struct device *dev,
+				     struct device_attribute *attr, char *buf)
+{
+	struct Scsi_Host *shost = class_to_shost(dev);
+	struct ibmvfc_host *vhost = shost_priv(shost);
+	unsigned long flags = 0;
+	int len;
+
+	spin_lock_irqsave(shost->host_lock, flags);
+	len = snprintf(buf, PAGE_SIZE, "%d\n", vhost->log_level);
+	spin_unlock_irqrestore(shost->host_lock, flags);
+	return len;
+}
+
+/**
+ * ibmvfc_store_log_level - Change the adapter's error logging level
+ * @dev:	class device struct
+ * @buf:	buffer
+ *
+ * Return value:
+ * 	number of bytes printed to buffer
+ **/
+static ssize_t ibmvfc_store_log_level(struct device *dev,
+				      struct device_attribute *attr,
+				      const char *buf, size_t count)
+{
+	struct Scsi_Host *shost = class_to_shost(dev);
+	struct ibmvfc_host *vhost = shost_priv(shost);
+	unsigned long flags = 0;
+
+	spin_lock_irqsave(shost->host_lock, flags);
+	vhost->log_level = simple_strtoul(buf, NULL, 10);
+	spin_unlock_irqrestore(shost->host_lock, flags);
+	return strlen(buf);
+}
+
+static struct device_attribute ibmvfc_log_level_attr = {
+	.attr = {
+		.name =		"log_level",
+		.mode =		S_IRUGO | S_IWUSR,
+	},
+	.show = ibmvfc_show_log_level,
+	.store = ibmvfc_store_log_level
+};
+
+#ifdef CONFIG_SCSI_IBMVFC_TRACE
+/**
+ * ibmvfc_read_trace - Dump the adapter trace
+ * @kobj:		kobject struct
+ * @bin_attr:	bin_attribute struct
+ * @buf:		buffer
+ * @off:		offset
+ * @count:		buffer size
+ *
+ * Return value:
+ *	number of bytes printed to buffer
+ **/
+static ssize_t ibmvfc_read_trace(struct kobject *kobj,
+				 struct bin_attribute *bin_attr,
+				 char *buf, loff_t off, size_t count)
+{
+	struct device *dev = container_of(kobj, struct device, kobj);
+	struct Scsi_Host *shost = class_to_shost(dev);
+	struct ibmvfc_host *vhost = shost_priv(shost);
+	unsigned long flags = 0;
+	int size = IBMVFC_TRACE_SIZE;
+	char *src = (char *)vhost->trace;
+
+	if (off > size)
+		return 0;
+	if (off + count > size) {
+		size -= off;
+		count = size;
+	}
+
+	spin_lock_irqsave(shost->host_lock, flags);
+	memcpy(buf, &src[off], count);
+	spin_unlock_irqrestore(shost->host_lock, flags);
+	return count;
+}
+
+static struct bin_attribute ibmvfc_trace_attr = {
+	.attr =	{
+		.name = "trace",
+		.mode = S_IRUGO,
+	},
+	.size = 0,
+	.read = ibmvfc_read_trace,
+};
+#endif
+
+static struct device_attribute *ibmvfc_attrs[] = {
+	&ibmvfc_host_partition_name,
+	&ibmvfc_host_device_name,
+	&ibmvfc_host_loc_code,
+	&ibmvfc_host_drc_name,
+	&ibmvfc_host_npiv_version,
+	&ibmvfc_log_level_attr,
+	NULL
+};
+
+static struct scsi_host_template driver_template = {
+	.module = THIS_MODULE,
+	.name = "IBM POWER Virtual FC Adapter",
+	.proc_name = IBMVFC_NAME,
+	.queuecommand = ibmvfc_queuecommand,
+	.eh_abort_handler = ibmvfc_eh_abort_handler,
+	.eh_device_reset_handler = ibmvfc_eh_device_reset_handler,
+	.eh_target_reset_handler = ibmvfc_eh_target_reset_handler,
+	.eh_host_reset_handler = ibmvfc_eh_host_reset_handler,
+	.slave_alloc = ibmvfc_slave_alloc,
+	.slave_configure = ibmvfc_slave_configure,
+	.scan_finished = ibmvfc_scan_finished,
+	.change_queue_depth = ibmvfc_change_queue_depth,
+	.change_queue_type = ibmvfc_change_queue_type,
+	.cmd_per_lun = 16,
+	.can_queue = IBMVFC_MAX_REQUESTS_DEFAULT,
+	.this_id = -1,
+	.sg_tablesize = SG_ALL,
+	.max_sectors = IBMVFC_MAX_SECTORS,
+	.use_clustering = ENABLE_CLUSTERING,
+	.shost_attrs = ibmvfc_attrs,
+};
+
+/**
+ * ibmvfc_next_async_crq - Returns the next entry in async queue
+ * @vhost:	ibmvfc host struct
+ *
+ * Returns:
+ *	Pointer to next entry in queue / NULL if empty
+ **/
+static struct ibmvfc_async_crq *ibmvfc_next_async_crq(struct ibmvfc_host *vhost)
+{
+	struct ibmvfc_async_crq_queue *async_crq = &vhost->async_crq;
+	struct ibmvfc_async_crq *crq;
+
+	crq = &async_crq->msgs[async_crq->cur];
+	if (crq->valid & 0x80) {
+		if (++async_crq->cur == async_crq->size)
+			async_crq->cur = 0;
+	} else
+		crq = NULL;
+
+	return crq;
+}
+
+/**
+ * ibmvfc_next_crq - Returns the next entry in message queue
+ * @vhost:	ibmvfc host struct
+ *
+ * Returns:
+ *	Pointer to next entry in queue / NULL if empty
+ **/
+static struct ibmvfc_crq *ibmvfc_next_crq(struct ibmvfc_host *vhost)
+{
+	struct ibmvfc_crq_queue *queue = &vhost->crq;
+	struct ibmvfc_crq *crq;
+
+	crq = &queue->msgs[queue->cur];
+	if (crq->valid & 0x80) {
+		if (++queue->cur == queue->size)
+			queue->cur = 0;
+	} else
+		crq = NULL;
+
+	return crq;
+}
+
+/**
+ * ibmvfc_interrupt - Interrupt handler
+ * @irq:		number of irq to handle, not used
+ * @dev_instance: ibmvfc_host that received interrupt
+ *
+ * Returns:
+ *	IRQ_HANDLED
+ **/
+static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance)
+{
+	struct ibmvfc_host *vhost = (struct ibmvfc_host *)dev_instance;
+	struct vio_dev *vdev = to_vio_dev(vhost->dev);
+	struct ibmvfc_crq *crq;
+	struct ibmvfc_async_crq *async;
+	unsigned long flags;
+	int done = 0;
+
+	spin_lock_irqsave(vhost->host->host_lock, flags);
+	vio_disable_interrupts(to_vio_dev(vhost->dev));
+	while (!done) {
+		/* Pull all the valid messages off the CRQ */
+		while ((crq = ibmvfc_next_crq(vhost)) != NULL) {
+			ibmvfc_handle_crq(crq, vhost);
+			crq->valid = 0;
+		}
+
+		/* Pull all the valid messages off the async CRQ */
+		while ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
+			ibmvfc_handle_async(async, vhost);
+			async->valid = 0;
+		}
+
+		vio_enable_interrupts(vdev);
+		if ((crq = ibmvfc_next_crq(vhost)) != NULL) {
+			vio_disable_interrupts(vdev);
+			ibmvfc_handle_crq(crq, vhost);
+			crq->valid = 0;
+		} else if ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
+			vio_disable_interrupts(vdev);
+			ibmvfc_handle_async(async, vhost);
+			crq->valid = 0;
+		} else
+			done = 1;
+	}
+
+	spin_unlock_irqrestore(vhost->host->host_lock, flags);
+	return IRQ_HANDLED;
+}
+
+/**
+ * ibmvfc_init_tgt - Set the next init job step for the target
+ * @tgt:		ibmvfc target struct
+ * @job_step:	job step to perform
+ *
+ **/
+static void ibmvfc_init_tgt(struct ibmvfc_target *tgt,
+			    void (*job_step) (struct ibmvfc_target *))
+{
+	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT);
+	tgt->job_step = job_step;
+	wake_up(&tgt->vhost->work_wait_q);
+}
+
+/**
+ * ibmvfc_retry_tgt_init - Attempt to retry a step in target initialization
+ * @tgt:		ibmvfc target struct
+ * @job_step:	initialization job step
+ *
+ **/
+static void ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt,
+				  void (*job_step) (struct ibmvfc_target *))
+{
+	if (++tgt->init_retries > IBMVFC_MAX_INIT_RETRIES) {
+		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
+		wake_up(&tgt->vhost->work_wait_q);
+	} else
+		ibmvfc_init_tgt(tgt, job_step);
+}
+
+/**
+ * ibmvfc_release_tgt - Free memory allocated for a target
+ * @kref:		kref struct
+ *
+ **/
+static void ibmvfc_release_tgt(struct kref *kref)
+{
+	struct ibmvfc_target *tgt = container_of(kref,struct ibmvfc_target,kref);
+	kfree(tgt);
+}
+
+/**
+ * ibmvfc_tgt_prli_done - Completion handler for Process Login
+ * @evt:	ibmvfc event struct
+ *
+ **/
+static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt)
+{
+	struct ibmvfc_target *tgt = evt->tgt;
+	struct ibmvfc_host *vhost = evt->vhost;
+	struct ibmvfc_process_login *rsp = &evt->xfer_iu->prli;
+	u32 status = rsp->common.status;
+
+	vhost->discovery_threads--;
+	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
+	switch (status) {
+	case IBMVFC_MAD_SUCCESS:
+		tgt_dbg(tgt, "Process Login succeeded\n");
+		tgt->need_login = 0;
+		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_ADD_RPORT);
+		break;
+	case IBMVFC_MAD_DRIVER_FAILED:
+		break;
+	case IBMVFC_MAD_CRQ_ERROR:
+		ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
+		break;
+	case IBMVFC_MAD_FAILED:
+	default:
+		tgt_err(tgt, "Process Login failed: %s (%x:%x) rc=0x%02X\n",
+			ibmvfc_get_cmd_error(rsp->status, rsp->error),
+			rsp->status, rsp->error, status);
+		if (ibmvfc_retry_cmd(rsp->status, rsp->error))
+			ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
+		break;
+	};
+
+	kref_put(&tgt->kref, ibmvfc_release_tgt);
+	ibmvfc_free_event(evt);
+	wake_up(&vhost->work_wait_q);
+}
+
+/**
+ * ibmvfc_tgt_send_prli - Send a process login
+ * @tgt:	ibmvfc target struct
+ *
+ **/
+static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt)
+{
+	struct ibmvfc_process_login *prli;
+	struct ibmvfc_host *vhost = tgt->vhost;
+	struct ibmvfc_event *evt;
+
+	if (vhost->discovery_threads >= disc_threads)
+		return;
+
+	kref_get(&tgt->kref);
+	evt = ibmvfc_get_event(vhost);
+	vhost->discovery_threads++;
+	ibmvfc_init_event(evt, ibmvfc_tgt_prli_done, IBMVFC_MAD_FORMAT);
+	evt->tgt = tgt;
+	prli = &evt->iu.prli;
+	memset(prli, 0, sizeof(*prli));
+	prli->common.version = 1;
+	prli->common.opcode = IBMVFC_PROCESS_LOGIN;
+	prli->common.length = sizeof(*prli);
+	prli->scsi_id = tgt->scsi_id;
+
+	prli->parms.type = IBMVFC_SCSI_FCP_TYPE;
+	prli->parms.flags = IBMVFC_PRLI_EST_IMG_PAIR;
+	prli->parms.service_parms = IBMVFC_PRLI_INITIATOR_FUNC;
+
+	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
+	if (ibmvfc_send_event(evt, vhost, default_timeout)) {
+		vhost->discovery_threads--;
+		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
+		kref_put(&tgt->kref, ibmvfc_release_tgt);
+	} else
+		tgt_dbg(tgt, "Sent process login\n");
+}
+
+/**
+ * ibmvfc_tgt_plogi_done - Completion handler for Port Login
+ * @evt:	ibmvfc event struct
+ *
+ **/
+static void ibmvfc_tgt_plogi_done(struct ibmvfc_event *evt)
+{
+	struct ibmvfc_target *tgt = evt->tgt;
+	struct ibmvfc_host *vhost = evt->vhost;
+	struct ibmvfc_port_login *rsp = &evt->xfer_iu->plogi;
+	u32 status = rsp->common.status;
+
+	vhost->discovery_threads--;
+	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
+	switch (status) {
+	case IBMVFC_MAD_SUCCESS:
+		tgt_dbg(tgt, "Port Login succeeded\n");
+		if (tgt->ids.port_name &&
+		    tgt->ids.port_name != wwn_to_u64(rsp->service_parms.port_name)) {
+			vhost->reinit = 1;
+			tgt_dbg(tgt, "Port re-init required\n");
+			break;
+		}
+		tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name);
+		tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name);
+		tgt->ids.port_id = tgt->scsi_id;
+		tgt->ids.roles = FC_PORT_ROLE_FCP_TARGET;
+		memcpy(&tgt->service_parms, &rsp->service_parms,
+		       sizeof (tgt->service_parms));
+		memcpy(&tgt->service_parms_change, &rsp->service_parms_change,
+		       sizeof (tgt->service_parms_change));
+		ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli);
+		break;
+	case IBMVFC_MAD_DRIVER_FAILED:
+		break;
+	case IBMVFC_MAD_CRQ_ERROR:
+		ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
+		break;
+	case IBMVFC_MAD_FAILED:
+	default:
+		tgt_err(tgt, "Port Login failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
+			ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error,
+			ibmvfc_get_fc_type(rsp->fc_type), rsp->fc_type,
+			ibmvfc_get_ls_explain(rsp->fc_explain), rsp->fc_explain, status);
+
+		if (ibmvfc_retry_cmd(rsp->status, rsp->error))
+			ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
+		break;
+	};
+
+	kref_put(&tgt->kref, ibmvfc_release_tgt);
+	ibmvfc_free_event(evt);
+	wake_up(&vhost->work_wait_q);
+}
+
+/**
+ * ibmvfc_tgt_send_plogi - Send PLOGI to the specified target
+ * @tgt:	ibmvfc target struct
+ *
+ **/
+static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *tgt)
+{
+	struct ibmvfc_port_login *plogi;
+	struct ibmvfc_host *vhost = tgt->vhost;
+	struct ibmvfc_event *evt;
+
+	if (vhost->discovery_threads >= disc_threads)
+		return;
+
+	kref_get(&tgt->kref);
+	evt = ibmvfc_get_event(vhost);
+	vhost->discovery_threads++;
+	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
+	ibmvfc_init_event(evt, ibmvfc_tgt_plogi_done, IBMVFC_MAD_FORMAT);
+	evt->tgt = tgt;
+	plogi = &evt->iu.plogi;
+	memset(plogi, 0, sizeof(*plogi));
+	plogi->common.version = 1;
+	plogi->common.opcode = IBMVFC_PORT_LOGIN;
+	plogi->common.length = sizeof(*plogi);
+	plogi->scsi_id = tgt->scsi_id;
+
+	if (ibmvfc_send_event(evt, vhost, default_timeout)) {
+		vhost->discovery_threads--;
+		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
+		kref_put(&tgt->kref, ibmvfc_release_tgt);
+	} else
+		tgt_dbg(tgt, "Sent port login\n");
+}
+
+/**
+ * ibmvfc_tgt_implicit_logout_done - Completion handler for Implicit Logout MAD
+ * @evt:	ibmvfc event struct
+ *
+ **/
+static void ibmvfc_tgt_implicit_logout_done(struct ibmvfc_event *evt)
+{
+	struct ibmvfc_target *tgt = evt->tgt;
+	struct ibmvfc_host *vhost = evt->vhost;
+	struct ibmvfc_implicit_logout *rsp = &evt->xfer_iu->implicit_logout;
+	u32 status = rsp->common.status;
+
+	vhost->discovery_threads--;
+	ibmvfc_free_event(evt);
+	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
+
+	switch (status) {
+	case IBMVFC_MAD_SUCCESS:
+		tgt_dbg(tgt, "Implicit Logout succeeded\n");
+		break;
+	case IBMVFC_MAD_DRIVER_FAILED:
+		kref_put(&tgt->kref, ibmvfc_release_tgt);
+		wake_up(&vhost->work_wait_q);
+		return;
+	case IBMVFC_MAD_FAILED:
+	default:
+		tgt_err(tgt, "Implicit Logout failed: rc=0x%02X\n", status);
+		break;
+	};
+
+	if (vhost->action == IBMVFC_HOST_ACTION_TGT_INIT)
+		ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_plogi);
+	else if (vhost->action == IBMVFC_HOST_ACTION_QUERY_TGTS &&
+		 tgt->scsi_id != tgt->new_scsi_id)
+		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
+	kref_put(&tgt->kref, ibmvfc_release_tgt);
+	wake_up(&vhost->work_wait_q);
+}
+
+/**
+ * ibmvfc_tgt_implicit_logout - Initiate an Implicit Logout for specified target
+ * @tgt:		ibmvfc target struct
+ *
+ **/
+static void ibmvfc_tgt_implicit_logout(struct ibmvfc_target *tgt)
+{
+	struct ibmvfc_implicit_logout *mad;
+	struct ibmvfc_host *vhost = tgt->vhost;
+	struct ibmvfc_event *evt;
+
+	if (vhost->discovery_threads >= disc_threads)
+		return;
+
+	kref_get(&tgt->kref);
+	evt = ibmvfc_get_event(vhost);
+	vhost->discovery_threads++;
+	ibmvfc_init_event(evt, ibmvfc_tgt_implicit_logout_done, IBMVFC_MAD_FORMAT);
+	evt->tgt = tgt;
+	mad = &evt->iu.implicit_logout;
+	memset(mad, 0, sizeof(*mad));
+	mad->common.version = 1;
+	mad->common.opcode = IBMVFC_IMPLICIT_LOGOUT;
+	mad->common.length = sizeof(*mad);
+	mad->old_scsi_id = tgt->scsi_id;
+
+	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
+	if (ibmvfc_send_event(evt, vhost, default_timeout)) {
+		vhost->discovery_threads--;
+		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
+		kref_put(&tgt->kref, ibmvfc_release_tgt);
+	} else
+		tgt_dbg(tgt, "Sent Implicit Logout\n");
+}
+
+/**
+ * ibmvfc_tgt_query_target_done - Completion handler for Query Target MAD
+ * @evt:	ibmvfc event struct
+ *
+ **/
+static void ibmvfc_tgt_query_target_done(struct ibmvfc_event *evt)
+{
+	struct ibmvfc_target *tgt = evt->tgt;
+	struct ibmvfc_host *vhost = evt->vhost;
+	struct ibmvfc_query_tgt *rsp = &evt->xfer_iu->query_tgt;
+	u32 status = rsp->common.status;
+
+	vhost->discovery_threads--;
+	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
+	switch (status) {
+	case IBMVFC_MAD_SUCCESS:
+		tgt_dbg(tgt, "Query Target succeeded\n");
+		tgt->new_scsi_id = rsp->scsi_id;
+		if (rsp->scsi_id != tgt->scsi_id)
+			ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
+		break;
+	case IBMVFC_MAD_DRIVER_FAILED:
+		break;
+	case IBMVFC_MAD_CRQ_ERROR:
+		ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
+		break;
+	case IBMVFC_MAD_FAILED:
+	default:
+		tgt_err(tgt, "Query Target failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
+			ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error,
+			ibmvfc_get_fc_type(rsp->fc_type), rsp->fc_type,
+			ibmvfc_get_gs_explain(rsp->fc_explain), rsp->fc_explain, status);
+
+		if ((rsp->status & IBMVFC_FABRIC_MAPPED) == IBMVFC_FABRIC_MAPPED &&
+		    rsp->error == IBMVFC_UNABLE_TO_PERFORM_REQ &&
+		    rsp->fc_explain == IBMVFC_PORT_NAME_NOT_REG)
+			ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
+		else if (ibmvfc_retry_cmd(rsp->status, rsp->error))
+			ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
+		break;
+	};
+
+	kref_put(&tgt->kref, ibmvfc_release_tgt);
+	ibmvfc_free_event(evt);
+	wake_up(&vhost->work_wait_q);
+}
+
+/**
+ * ibmvfc_tgt_query_target - Initiate a Query Target for specified target
+ * @tgt:	ibmvfc target struct
+ *
+ **/
+static void ibmvfc_tgt_query_target(struct ibmvfc_target *tgt)
+{
+	struct ibmvfc_query_tgt *query_tgt;
+	struct ibmvfc_host *vhost = tgt->vhost;
+	struct ibmvfc_event *evt;
+
+	if (vhost->discovery_threads >= disc_threads)
+		return;
+
+	kref_get(&tgt->kref);
+	evt = ibmvfc_get_event(vhost);
+	vhost->discovery_threads++;
+	evt->tgt = tgt;
+	ibmvfc_init_event(evt, ibmvfc_tgt_query_target_done, IBMVFC_MAD_FORMAT);
+	query_tgt = &evt->iu.query_tgt;
+	memset(query_tgt, 0, sizeof(*query_tgt));
+	query_tgt->common.version = 1;
+	query_tgt->common.opcode = IBMVFC_QUERY_TARGET;
+	query_tgt->common.length = sizeof(*query_tgt);
+	query_tgt->wwpn = tgt->ids.port_name;
+
+	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
+	if (ibmvfc_send_event(evt, vhost, default_timeout)) {
+		vhost->discovery_threads--;
+		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
+		kref_put(&tgt->kref, ibmvfc_release_tgt);
+	} else
+		tgt_dbg(tgt, "Sent Query Target\n");
+}
+
+/**
+ * ibmvfc_alloc_target - Allocate and initialize an ibmvfc target
+ * @vhost:		ibmvfc host struct
+ * @scsi_id:	SCSI ID to allocate target for
+ *
+ * Returns:
+ *	0 on success / other on failure
+ **/
+static int ibmvfc_alloc_target(struct ibmvfc_host *vhost, u64 scsi_id)
+{
+	struct ibmvfc_target *tgt;
+	unsigned long flags;
+
+	spin_lock_irqsave(vhost->host->host_lock, flags);
+	list_for_each_entry(tgt, &vhost->targets, queue) {
+		if (tgt->scsi_id == scsi_id) {
+			if (tgt->need_login)
+				ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
+			goto unlock_out;
+		}
+	}
+	spin_unlock_irqrestore(vhost->host->host_lock, flags);
+
+	tgt = mempool_alloc(vhost->tgt_pool, GFP_KERNEL);
+	if (!tgt) {
+		dev_err(vhost->dev, "Target allocation failure for scsi id %08lx\n",
+			scsi_id);
+		return -ENOMEM;
+	}
+
+	tgt->scsi_id = scsi_id;
+	tgt->new_scsi_id = scsi_id;
+	tgt->vhost = vhost;
+	tgt->need_login = 1;
+	kref_init(&tgt->kref);
+	ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
+	spin_lock_irqsave(vhost->host->host_lock, flags);
+	list_add_tail(&tgt->queue, &vhost->targets);
+
+unlock_out:
+	spin_unlock_irqrestore(vhost->host->host_lock, flags);
+	return 0;
+}
+
+/**
+ * ibmvfc_alloc_targets - Allocate and initialize ibmvfc targets
+ * @vhost:		ibmvfc host struct
+ *
+ * Returns:
+ *	0 on success / other on failure
+ **/
+static int ibmvfc_alloc_targets(struct ibmvfc_host *vhost)
+{
+	int i, rc;
+
+	for (i = 0, rc = 0; !rc && i < vhost->num_targets; i++)
+		rc = ibmvfc_alloc_target(vhost,
+					 vhost->disc_buf->scsi_id[i] & IBMVFC_DISC_TGT_SCSI_ID_MASK);
+
+	return rc;
+}
+
+/**
+ * ibmvfc_discover_targets_done - Completion handler for discover targets MAD
+ * @evt:	ibmvfc event struct
+ *
+ **/
+static void ibmvfc_discover_targets_done(struct ibmvfc_event *evt)
+{
+	struct ibmvfc_host *vhost = evt->vhost;
+	struct ibmvfc_discover_targets *rsp = &evt->xfer_iu->discover_targets;
+	u32 mad_status = rsp->common.status;
+
+	switch (mad_status) {
+	case IBMVFC_MAD_SUCCESS:
+		ibmvfc_dbg(vhost, "Discover Targets succeeded\n");
+		vhost->num_targets = rsp->num_written;
+		ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_ALLOC_TGTS);
+		break;
+	case IBMVFC_MAD_FAILED:
+		dev_err(vhost->dev, "Discover Targets failed: %s (%x:%x)\n",
+			ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error);
+		ibmvfc_retry_host_init(vhost);
+		break;
+	case IBMVFC_MAD_DRIVER_FAILED:
+		break;
+	default:
+		dev_err(vhost->dev, "Invalid Discover Targets response: 0x%x\n", mad_status);
+		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
+		break;
+	}
+
+	ibmvfc_free_event(evt);
+	wake_up(&vhost->work_wait_q);
+}
+
+/**
+ * ibmvfc_discover_targets - Send Discover Targets MAD
+ * @vhost:	ibmvfc host struct
+ *
+ **/
+static void ibmvfc_discover_targets(struct ibmvfc_host *vhost)
+{
+	struct ibmvfc_discover_targets *mad;
+	struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
+
+	ibmvfc_init_event(evt, ibmvfc_discover_targets_done, IBMVFC_MAD_FORMAT);
+	mad = &evt->iu.discover_targets;
+	memset(mad, 0, sizeof(*mad));
+	mad->common.version = 1;
+	mad->common.opcode = IBMVFC_DISC_TARGETS;
+	mad->common.length = sizeof(*mad);
+	mad->bufflen = vhost->disc_buf_sz;
+	mad->buffer.va = vhost->disc_buf_dma;
+	mad->buffer.len = vhost->disc_buf_sz;
+	ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
+
+	if (!ibmvfc_send_event(evt, vhost, default_timeout))
+		ibmvfc_dbg(vhost, "Sent discover targets\n");
+	else
+		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
+}
+
+/**
+ * ibmvfc_npiv_login_done - Completion handler for NPIV Login
+ * @evt:	ibmvfc event struct
+ *
+ **/
+static void ibmvfc_npiv_login_done(struct ibmvfc_event *evt)
+{
+	struct ibmvfc_host *vhost = evt->vhost;
+	u32 mad_status = evt->xfer_iu->npiv_login.common.status;
+	struct ibmvfc_npiv_login_resp *rsp = &vhost->login_buf->resp;
+	unsigned int npiv_max_sectors;
+
+	switch (mad_status) {
+	case IBMVFC_MAD_SUCCESS:
+		ibmvfc_free_event(evt);
+		break;
+	case IBMVFC_MAD_FAILED:
+		dev_err(vhost->dev, "NPIV Login failed: %s (%x:%x)\n",
+			ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error);
+		if (ibmvfc_retry_cmd(rsp->status, rsp->error))
+			ibmvfc_retry_host_init(vhost);
+		else
+			ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
+		ibmvfc_free_event(evt);
+		return;
+	case IBMVFC_MAD_CRQ_ERROR:
+		ibmvfc_retry_host_init(vhost);
+	case IBMVFC_MAD_DRIVER_FAILED:
+		ibmvfc_free_event(evt);
+		return;
+	default:
+		dev_err(vhost->dev, "Invalid NPIV Login response: 0x%x\n", mad_status);
+		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
+		ibmvfc_free_event(evt);
+		return;
+	}
+
+	ibmvfc_purge_requests(vhost, DID_REQUEUE);
+	vhost->client_migrated = 0;
+
+	if (!(rsp->flags & IBMVFC_NATIVE_FC)) {
+		dev_err(vhost->dev, "Virtual adapter does not support FC. %d\n",
+			rsp->flags);
+		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
+		wake_up(&vhost->work_wait_q);
+		return;
+	}
+
+	if (rsp->max_cmds <= IBMVFC_NUM_INTERNAL_REQ) {
+		dev_err(vhost->dev, "Virtual adapter supported queue depth too small: %d\n",
+			rsp->max_cmds);
+		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
+		wake_up(&vhost->work_wait_q);
+		return;
+	}
+
+	npiv_max_sectors = min((uint)(rsp->max_dma_len >> 9), IBMVFC_MAX_SECTORS);
+	dev_info(vhost->dev, "Host partition: %s, device: %s %s %s max sectors %u\n",
+		 rsp->partition_name, rsp->device_name, rsp->port_loc_code,
+		 rsp->drc_name, npiv_max_sectors);
+
+	fc_host_fabric_name(vhost->host) = rsp->node_name;
+	fc_host_node_name(vhost->host) = rsp->node_name;
+	fc_host_port_name(vhost->host) = rsp->port_name;
+	fc_host_port_id(vhost->host) = rsp->scsi_id;
+	fc_host_port_type(vhost->host) = FC_PORTTYPE_NPIV;
+	fc_host_supported_classes(vhost->host) = 0;
+	if (rsp->service_parms.class1_parms[0] & 0x80000000)
+		fc_host_supported_classes(vhost->host) |= FC_COS_CLASS1;
+	if (rsp->service_parms.class2_parms[0] & 0x80000000)
+		fc_host_supported_classes(vhost->host) |= FC_COS_CLASS2;
+	if (rsp->service_parms.class3_parms[0] & 0x80000000)
+		fc_host_supported_classes(vhost->host) |= FC_COS_CLASS3;
+	fc_host_maxframe_size(vhost->host) =
+		rsp->service_parms.common.bb_rcv_sz & 0x0fff;
+
+	vhost->host->can_queue = rsp->max_cmds - IBMVFC_NUM_INTERNAL_REQ;
+	vhost->host->max_sectors = npiv_max_sectors;
+	ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
+	wake_up(&vhost->work_wait_q);
+}
+
+/**
+ * ibmvfc_npiv_login - Sends NPIV login
+ * @vhost:	ibmvfc host struct
+ *
+ **/
+static void ibmvfc_npiv_login(struct ibmvfc_host *vhost)
+{
+	struct ibmvfc_npiv_login_mad *mad;
+	struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
+
+	ibmvfc_gather_partition_info(vhost);
+	ibmvfc_set_login_info(vhost);
+	ibmvfc_init_event(evt, ibmvfc_npiv_login_done, IBMVFC_MAD_FORMAT);
+
+	memcpy(vhost->login_buf, &vhost->login_info, sizeof(vhost->login_info));
+	mad = &evt->iu.npiv_login;
+	memset(mad, 0, sizeof(struct ibmvfc_npiv_login_mad));
+	mad->common.version = 1;
+	mad->common.opcode = IBMVFC_NPIV_LOGIN;
+	mad->common.length = sizeof(struct ibmvfc_npiv_login_mad);
+	mad->buffer.va = vhost->login_buf_dma;
+	mad->buffer.len = sizeof(*vhost->login_buf);
+
+	memset(vhost->async_crq.msgs, 0, PAGE_SIZE);
+	vhost->async_crq.cur = 0;
+	ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
+
+	if (!ibmvfc_send_event(evt, vhost, default_timeout))
+		ibmvfc_dbg(vhost, "Sent NPIV login\n");
+	else
+		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
+};
+
+/**
+ * ibmvfc_dev_init_to_do - Is there target initialization work to do?
+ * @vhost:		ibmvfc host struct
+ *
+ * Returns:
+ *	1 if work to do / 0 if not
+ **/
+static int ibmvfc_dev_init_to_do(struct ibmvfc_host *vhost)
+{
+	struct ibmvfc_target *tgt;
+
+	list_for_each_entry(tgt, &vhost->targets, queue) {
+		if (tgt->action == IBMVFC_TGT_ACTION_INIT ||
+		    tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
+			return 1;
+	}
+
+	return 0;
+}
+
+/**
+ * __ibmvfc_work_to_do - Is there task level work to do? (no locking)
+ * @vhost:		ibmvfc host struct
+ *
+ * Returns:
+ *	1 if work to do / 0 if not
+ **/
+static int __ibmvfc_work_to_do(struct ibmvfc_host *vhost)
+{
+	struct ibmvfc_target *tgt;
+
+	if (kthread_should_stop())
+		return 1;
+	switch (vhost->action) {
+	case IBMVFC_HOST_ACTION_NONE:
+	case IBMVFC_HOST_ACTION_INIT_WAIT:
+		return 0;
+	case IBMVFC_HOST_ACTION_TGT_INIT:
+	case IBMVFC_HOST_ACTION_QUERY_TGTS:
+		if (vhost->discovery_threads == disc_threads)
+			return 0;
+		list_for_each_entry(tgt, &vhost->targets, queue)
+			if (tgt->action == IBMVFC_TGT_ACTION_INIT)
+				return 1;
+		list_for_each_entry(tgt, &vhost->targets, queue)
+			if (tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
+				return 0;
+		return 1;
+	case IBMVFC_HOST_ACTION_INIT:
+	case IBMVFC_HOST_ACTION_ALLOC_TGTS:
+	case IBMVFC_HOST_ACTION_TGT_ADD:
+	case IBMVFC_HOST_ACTION_TGT_DEL:
+	case IBMVFC_HOST_ACTION_QUERY:
+	default:
+		break;
+	};
+
+	return 1;
+}
+
+/**
+ * ibmvfc_work_to_do - Is there task level work to do?
+ * @vhost:		ibmvfc host struct
+ *
+ * Returns:
+ *	1 if work to do / 0 if not
+ **/
+static int ibmvfc_work_to_do(struct ibmvfc_host *vhost)
+{
+	unsigned long flags;
+	int rc;
+
+	spin_lock_irqsave(vhost->host->host_lock, flags);
+	rc = __ibmvfc_work_to_do(vhost);
+	spin_unlock_irqrestore(vhost->host->host_lock, flags);
+	return rc;
+}
+
+/**
+ * ibmvfc_log_ae - Log async events if necessary
+ * @vhost:		ibmvfc host struct
+ * @events:		events to log
+ *
+ **/
+static void ibmvfc_log_ae(struct ibmvfc_host *vhost, int events)
+{
+	if (events & IBMVFC_AE_RSCN)
+		fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_RSCN, 0);
+	if ((events & IBMVFC_AE_LINKDOWN) &&
+	    vhost->state >= IBMVFC_HALTED)
+		fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKDOWN, 0);
+	if ((events & IBMVFC_AE_LINKUP) &&
+	    vhost->state == IBMVFC_INITIALIZING)
+		fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKUP, 0);
+}
+
+/**
+ * ibmvfc_tgt_add_rport - Tell the FC transport about a new remote port
+ * @tgt:		ibmvfc target struct
+ *
+ **/
+static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt)
+{
+	struct ibmvfc_host *vhost = tgt->vhost;
+	struct fc_rport *rport;
+	unsigned long flags;
+
+	tgt_dbg(tgt, "Adding rport\n");
+	rport = fc_remote_port_add(vhost->host, 0, &tgt->ids);
+	spin_lock_irqsave(vhost->host->host_lock, flags);
+	tgt->rport = rport;
+	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
+	if (rport) {
+		tgt_dbg(tgt, "rport add succeeded\n");
+		rport->maxframe_size = tgt->service_parms.common.bb_rcv_sz & 0x0fff;
+		rport->supported_classes = 0;
+		if (tgt->service_parms.class1_parms[0] & 0x80000000)
+			rport->supported_classes |= FC_COS_CLASS1;
+		if (tgt->service_parms.class2_parms[0] & 0x80000000)
+			rport->supported_classes |= FC_COS_CLASS2;
+		if (tgt->service_parms.class3_parms[0] & 0x80000000)
+			rport->supported_classes |= FC_COS_CLASS3;
+	} else
+		tgt_dbg(tgt, "rport add failed\n");
+	spin_unlock_irqrestore(vhost->host->host_lock, flags);
+}
+
+/**
+ * ibmvfc_do_work - Do task level work
+ * @vhost:		ibmvfc host struct
+ *
+ **/
+static void ibmvfc_do_work(struct ibmvfc_host *vhost)
+{
+	struct ibmvfc_target *tgt;
+	unsigned long flags;
+	struct fc_rport *rport;
+
+	ibmvfc_log_ae(vhost, vhost->events_to_log);
+	spin_lock_irqsave(vhost->host->host_lock, flags);
+	vhost->events_to_log = 0;
+	switch (vhost->action) {
+	case IBMVFC_HOST_ACTION_NONE:
+	case IBMVFC_HOST_ACTION_INIT_WAIT:
+		break;
+	case IBMVFC_HOST_ACTION_INIT:
+		BUG_ON(vhost->state != IBMVFC_INITIALIZING);
+		vhost->job_step(vhost);
+		break;
+	case IBMVFC_HOST_ACTION_QUERY:
+		list_for_each_entry(tgt, &vhost->targets, queue)
+			ibmvfc_init_tgt(tgt, ibmvfc_tgt_query_target);
+		ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY_TGTS);
+		break;
+	case IBMVFC_HOST_ACTION_QUERY_TGTS:
+		list_for_each_entry(tgt, &vhost->targets, queue) {
+			if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
+				tgt->job_step(tgt);
+				break;
+			}
+		}
+
+		if (!ibmvfc_dev_init_to_do(vhost))
+			ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
+		break;
+	case IBMVFC_HOST_ACTION_TGT_DEL:
+		list_for_each_entry(tgt, &vhost->targets, queue) {
+			if (tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
+				tgt_dbg(tgt, "Deleting rport\n");
+				rport = tgt->rport;
+				tgt->rport = NULL;
+				list_del(&tgt->queue);
+				spin_unlock_irqrestore(vhost->host->host_lock, flags);
+				if (rport)
+					fc_remote_port_delete(rport);
+				kref_put(&tgt->kref, ibmvfc_release_tgt);
+				return;
+			}
+		}
+
+		if (vhost->state == IBMVFC_INITIALIZING) {
+			ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
+			vhost->job_step = ibmvfc_discover_targets;
+		} else {
+			ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
+			spin_unlock_irqrestore(vhost->host->host_lock, flags);
+			scsi_unblock_requests(vhost->host);
+			wake_up(&vhost->init_wait_q);
+			return;
+		}
+		break;
+	case IBMVFC_HOST_ACTION_ALLOC_TGTS:
+		ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_INIT);
+		spin_unlock_irqrestore(vhost->host->host_lock, flags);
+		ibmvfc_alloc_targets(vhost);
+		spin_lock_irqsave(vhost->host->host_lock, flags);
+		break;
+	case IBMVFC_HOST_ACTION_TGT_INIT:
+		list_for_each_entry(tgt, &vhost->targets, queue) {
+			if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
+				tgt->job_step(tgt);
+				break;
+			}
+		}
+
+		if (!ibmvfc_dev_init_to_do(vhost)) {
+			ibmvfc_set_host_state(vhost, IBMVFC_ACTIVE);
+			ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_ADD);
+			vhost->init_retries = 0;
+			spin_unlock_irqrestore(vhost->host->host_lock, flags);
+			scsi_unblock_requests(vhost->host);
+			return;
+		}
+		break;
+	case IBMVFC_HOST_ACTION_TGT_ADD:
+		list_for_each_entry(tgt, &vhost->targets, queue) {
+			if (tgt->action == IBMVFC_TGT_ACTION_ADD_RPORT) {
+				spin_unlock_irqrestore(vhost->host->host_lock, flags);
+				ibmvfc_tgt_add_rport(tgt);
+				return;
+			} else if (tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
+				tgt_dbg(tgt, "Deleting rport\n");
+				rport = tgt->rport;
+				tgt->rport = NULL;
+				list_del(&tgt->queue);
+				spin_unlock_irqrestore(vhost->host->host_lock, flags);
+				if (rport)
+					fc_remote_port_delete(rport);
+				kref_put(&tgt->kref, ibmvfc_release_tgt);
+				return;
+			}
+		}
+
+		if (vhost->reinit) {
+			vhost->reinit = 0;
+			ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
+		} else {
+			ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
+			wake_up(&vhost->init_wait_q);
+		}
+		break;
+	default:
+		break;
+	};
+
+	spin_unlock_irqrestore(vhost->host->host_lock, flags);
+}
+
+/**
+ * ibmvfc_work - Do task level work
+ * @data:		ibmvfc host struct
+ *
+ * Returns:
+ *	zero
+ **/
+static int ibmvfc_work(void *data)
+{
+	struct ibmvfc_host *vhost = data;
+	int rc;
+
+	set_user_nice(current, -20);
+
+	while (1) {
+		rc = wait_event_interruptible(vhost->work_wait_q,
+					      ibmvfc_work_to_do(vhost));
+
+		BUG_ON(rc);
+
+		if (kthread_should_stop())
+			break;
+
+		ibmvfc_do_work(vhost);
+	}
+
+	ibmvfc_dbg(vhost, "ibmvfc kthread exiting...\n");
+	return 0;
+}
+
+/**
+ * ibmvfc_init_crq - Initializes and registers CRQ with hypervisor
+ * @vhost:	ibmvfc host struct
+ *
+ * Allocates a page for messages, maps it for dma, and registers
+ * the crq with the hypervisor.
+ *
+ * Return value:
+ *	zero on success / other on failure
+ **/
+static int ibmvfc_init_crq(struct ibmvfc_host *vhost)
+{
+	int rc, retrc = -ENOMEM;
+	struct device *dev = vhost->dev;
+	struct vio_dev *vdev = to_vio_dev(dev);
+	struct ibmvfc_crq_queue *crq = &vhost->crq;
+
+	ENTER;
+	crq->msgs = (struct ibmvfc_crq *)get_zeroed_page(GFP_KERNEL);
+
+	if (!crq->msgs)
+		return -ENOMEM;
+
+	crq->size = PAGE_SIZE / sizeof(*crq->msgs);
+	crq->msg_token = dma_map_single(dev, crq->msgs,
+					PAGE_SIZE, DMA_BIDIRECTIONAL);
+
+	if (dma_mapping_error(crq->msg_token))
+		goto map_failed;
+
+	retrc = rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
+					crq->msg_token, PAGE_SIZE);
+
+	if (rc == H_RESOURCE)
+		/* maybe kexecing and resource is busy. try a reset */
+		retrc = rc = ibmvfc_reset_crq(vhost);
+
+	if (rc == H_CLOSED)
+		dev_warn(dev, "Partner adapter not ready\n");
+	else if (rc) {
+		dev_warn(dev, "Error %d opening adapter\n", rc);
+		goto reg_crq_failed;
+	}
+
+	retrc = 0;
+
+	if ((rc = request_irq(vdev->irq, ibmvfc_interrupt, 0, IBMVFC_NAME, vhost))) {
+		dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n", vdev->irq, rc);
+		goto req_irq_failed;
+	}
+
+	if ((rc = vio_enable_interrupts(vdev))) {
+		dev_err(dev, "Error %d enabling interrupts\n", rc);
+		goto req_irq_failed;
+	}
+
+	crq->cur = 0;
+	LEAVE;
+	return retrc;
+
+req_irq_failed:
+	do {
+		rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
+	} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
+reg_crq_failed:
+	dma_unmap_single(dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
+map_failed:
+	free_page((unsigned long)crq->msgs);
+	return retrc;
+}
+
+/**
+ * ibmvfc_free_mem - Free memory for vhost
+ * @vhost:	ibmvfc host struct
+ *
+ * Return value:
+ * 	none
+ **/
+static void ibmvfc_free_mem(struct ibmvfc_host *vhost)
+{
+	struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
+
+	ENTER;
+	mempool_destroy(vhost->tgt_pool);
+	kfree(vhost->trace);
+	dma_free_coherent(vhost->dev, vhost->disc_buf_sz, vhost->disc_buf,
+			  vhost->disc_buf_dma);
+	dma_free_coherent(vhost->dev, sizeof(*vhost->login_buf),
+			  vhost->login_buf, vhost->login_buf_dma);
+	dma_pool_destroy(vhost->sg_pool);
+	dma_unmap_single(vhost->dev, async_q->msg_token,
+			 async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
+	free_page((unsigned long)async_q->msgs);
+	LEAVE;
+}
+
+/**
+ * ibmvfc_alloc_mem - Allocate memory for vhost
+ * @vhost:	ibmvfc host struct
+ *
+ * Return value:
+ * 	0 on success / non-zero on failure
+ **/
+static int ibmvfc_alloc_mem(struct ibmvfc_host *vhost)
+{
+	struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
+	struct device *dev = vhost->dev;
+
+	ENTER;
+	async_q->msgs = (struct ibmvfc_async_crq *)get_zeroed_page(GFP_KERNEL);
+	if (!async_q->msgs) {
+		dev_err(dev, "Couldn't allocate async queue.\n");
+		goto nomem;
+	}
+
+	async_q->size = PAGE_SIZE / sizeof(struct ibmvfc_async_crq);
+	async_q->msg_token = dma_map_single(dev, async_q->msgs,
+					    async_q->size * sizeof(*async_q->msgs),
+					    DMA_BIDIRECTIONAL);
+
+	if (dma_mapping_error(async_q->msg_token)) {
+		dev_err(dev, "Failed to map async queue\n");
+		goto free_async_crq;
+	}
+
+	vhost->sg_pool = dma_pool_create(IBMVFC_NAME, dev,
+					 SG_ALL * sizeof(struct srp_direct_buf),
+					 sizeof(struct srp_direct_buf), 0);
+
+	if (!vhost->sg_pool) {
+		dev_err(dev, "Failed to allocate sg pool\n");
+		goto unmap_async_crq;
+	}
+
+	vhost->login_buf = dma_alloc_coherent(dev, sizeof(*vhost->login_buf),
+					      &vhost->login_buf_dma, GFP_KERNEL);
+
+	if (!vhost->login_buf) {
+		dev_err(dev, "Couldn't allocate NPIV login buffer\n");
+		goto free_sg_pool;
+	}
+
+	vhost->disc_buf_sz = sizeof(vhost->disc_buf->scsi_id[0]) * max_targets;
+	vhost->disc_buf = dma_alloc_coherent(dev, vhost->disc_buf_sz,
+					     &vhost->disc_buf_dma, GFP_KERNEL);
+
+	if (!vhost->disc_buf) {
+		dev_err(dev, "Couldn't allocate Discover Targets buffer\n");
+		goto free_login_buffer;
+	}
+
+	vhost->trace = kcalloc(IBMVFC_NUM_TRACE_ENTRIES,
+			       sizeof(struct ibmvfc_trace_entry), GFP_KERNEL);
+
+	if (!vhost->trace)
+		goto free_disc_buffer;
+
+	vhost->tgt_pool = mempool_create_kzalloc_pool(IBMVFC_TGT_MEMPOOL_SZ,
+						      sizeof(struct ibmvfc_target));
+
+	if (!vhost->tgt_pool) {
+		dev_err(dev, "Couldn't allocate target memory pool\n");
+		goto free_trace;
+	}
+
+	LEAVE;
+	return 0;
+
+free_trace:
+	kfree(vhost->trace);
+free_disc_buffer:
+	dma_free_coherent(dev, vhost->disc_buf_sz, vhost->disc_buf,
+			  vhost->disc_buf_dma);
+free_login_buffer:
+	dma_free_coherent(dev, sizeof(*vhost->login_buf),
+			  vhost->login_buf, vhost->login_buf_dma);
+free_sg_pool:
+	dma_pool_destroy(vhost->sg_pool);
+unmap_async_crq:
+	dma_unmap_single(dev, async_q->msg_token,
+			 async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
+free_async_crq:
+	free_page((unsigned long)async_q->msgs);
+nomem:
+	LEAVE;
+	return -ENOMEM;
+}
+
+/**
+ * ibmvfc_probe - Adapter hot plug add entry point
+ * @vdev:	vio device struct
+ * @id:	vio device id struct
+ *
+ * Return value:
+ * 	0 on success / non-zero on failure
+ **/
+static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
+{
+	struct ibmvfc_host *vhost;
+	struct Scsi_Host *shost;
+	struct device *dev = &vdev->dev;
+	int rc = -ENOMEM;
+
+	ENTER;
+	shost = scsi_host_alloc(&driver_template, sizeof(*vhost));
+	if (!shost) {
+		dev_err(dev, "Couldn't allocate host data\n");
+		goto out;
+	}
+
+	shost->transportt = ibmvfc_transport_template;
+	shost->can_queue = max_requests;
+	shost->max_lun = max_lun;
+	shost->max_id = max_targets;
+	shost->max_sectors = IBMVFC_MAX_SECTORS;
+	shost->max_cmd_len = IBMVFC_MAX_CDB_LEN;
+	shost->unique_id = shost->host_no;
+
+	vhost = shost_priv(shost);
+	INIT_LIST_HEAD(&vhost->sent);
+	INIT_LIST_HEAD(&vhost->free);
+	INIT_LIST_HEAD(&vhost->targets);
+	sprintf(vhost->name, IBMVFC_NAME);
+	vhost->host = shost;
+	vhost->dev = dev;
+	vhost->partition_number = -1;
+	vhost->log_level = log_level;
+	strcpy(vhost->partition_name, "UNKNOWN");
+	init_waitqueue_head(&vhost->work_wait_q);
+	init_waitqueue_head(&vhost->init_wait_q);
+
+	if ((rc = ibmvfc_alloc_mem(vhost)))
+		goto free_scsi_host;
+
+	vhost->work_thread = kthread_run(ibmvfc_work, vhost, "%s_%d", IBMVFC_NAME,
+					 shost->host_no);
+
+	if (IS_ERR(vhost->work_thread)) {
+		dev_err(dev, "Couldn't create kernel thread: %ld\n",
+			PTR_ERR(vhost->work_thread));
+		goto free_host_mem;
+	}
+
+	if ((rc = ibmvfc_init_crq(vhost))) {
+		dev_err(dev, "Couldn't initialize crq. rc=%d\n", rc);
+		goto kill_kthread;
+	}
+
+	if ((rc = ibmvfc_init_event_pool(vhost))) {
+		dev_err(dev, "Couldn't initialize event pool\n");
+		goto release_crq;
+	}
+
+	if ((rc = scsi_add_host(shost, dev)))
+		goto release_event_pool;
+
+	if ((rc = ibmvfc_create_trace_file(&shost->shost_dev.kobj,
+					   &ibmvfc_trace_attr))) {
+		dev_err(dev, "Failed to create trace file\n");
+		goto remove_shost;
+	}
+
+	dev_set_drvdata(dev, vhost);
+	spin_lock(&ibmvfc_driver_lock);
+	list_add_tail(&vhost->queue, &ibmvfc_head);
+	spin_unlock(&ibmvfc_driver_lock);
+
+	ibmvfc_send_crq_init(vhost);
+	scsi_scan_host(shost);
+	return 0;
+
+remove_shost:
+	scsi_remove_host(shost);
+release_event_pool:
+	ibmvfc_free_event_pool(vhost);
+release_crq:
+	ibmvfc_release_crq_queue(vhost);
+kill_kthread:
+	kthread_stop(vhost->work_thread);
+free_host_mem:
+	ibmvfc_free_mem(vhost);
+free_scsi_host:
+	scsi_host_put(shost);
+out:
+	LEAVE;
+	return rc;
+}
+
+/**
+ * ibmvfc_remove - Adapter hot plug remove entry point
+ * @vdev:	vio device struct
+ *
+ * Return value:
+ * 	0
+ **/
+static int ibmvfc_remove(struct vio_dev *vdev)
+{
+	struct ibmvfc_host *vhost = dev_get_drvdata(&vdev->dev);
+	unsigned long flags;
+
+	ENTER;
+	ibmvfc_remove_trace_file(&vhost->host->shost_dev.kobj, &ibmvfc_trace_attr);
+	kthread_stop(vhost->work_thread);
+	fc_remove_host(vhost->host);
+	scsi_remove_host(vhost->host);
+	ibmvfc_release_crq_queue(vhost);
+
+	spin_lock_irqsave(vhost->host->host_lock, flags);
+	ibmvfc_purge_requests(vhost, DID_ERROR);
+	ibmvfc_free_event_pool(vhost);
+	spin_unlock_irqrestore(vhost->host->host_lock, flags);
+
+	ibmvfc_free_mem(vhost);
+	spin_lock(&ibmvfc_driver_lock);
+	list_del(&vhost->queue);
+	spin_unlock(&ibmvfc_driver_lock);
+	scsi_host_put(vhost->host);
+	LEAVE;
+	return 0;
+}
+
+static struct vio_device_id ibmvfc_device_table[] __devinitdata = {
+	{"fcp", "IBM,vfc-client"},
+	{ "", "" }
+};
+MODULE_DEVICE_TABLE(vio, ibmvfc_device_table);
+
+static struct vio_driver ibmvfc_driver = {
+	.id_table = ibmvfc_device_table,
+	.probe = ibmvfc_probe,
+	.remove = ibmvfc_remove,
+	.driver = {
+		.name = IBMVFC_NAME,
+		.owner = THIS_MODULE,
+	}
+};
+
+static struct fc_function_template ibmvfc_transport_functions = {
+	.show_host_fabric_name = 1,
+	.show_host_node_name = 1,
+	.show_host_port_name = 1,
+	.show_host_supported_classes = 1,
+	.show_host_port_type = 1,
+	.show_host_port_id = 1,
+
+	.get_host_port_state = ibmvfc_get_host_port_state,
+	.show_host_port_state = 1,
+
+	.get_host_speed = ibmvfc_get_host_speed,
+	.show_host_speed = 1,
+
+	.issue_fc_host_lip = ibmvfc_issue_fc_host_lip,
+	.terminate_rport_io = ibmvfc_terminate_rport_io,
+
+	.show_rport_maxframe_size = 1,
+	.show_rport_supported_classes = 1,
+
+	.set_rport_dev_loss_tmo = ibmvfc_set_rport_dev_loss_tmo,
+	.show_rport_dev_loss_tmo = 1,
+
+	.get_starget_node_name = ibmvfc_get_starget_node_name,
+	.show_starget_node_name = 1,
+
+	.get_starget_port_name = ibmvfc_get_starget_port_name,
+	.show_starget_port_name = 1,
+
+	.get_starget_port_id = ibmvfc_get_starget_port_id,
+	.show_starget_port_id = 1,
+};
+
+/**
+ * ibmvfc_module_init - Initialize the ibmvfc module
+ *
+ * Return value:
+ * 	0 on success / other on failure
+ **/
+static int __init ibmvfc_module_init(void)
+{
+	int rc;
+
+	if (!firmware_has_feature(FW_FEATURE_VIO))
+		return -ENODEV;
+
+	printk(KERN_INFO IBMVFC_NAME": IBM Virtual Fibre Channel Driver version: %s %s\n",
+	       IBMVFC_DRIVER_VERSION, IBMVFC_DRIVER_DATE);
+
+	ibmvfc_transport_template = fc_attach_transport(&ibmvfc_transport_functions);
+	if (!ibmvfc_transport_template)
+		return -ENOMEM;
+
+	rc = vio_register_driver(&ibmvfc_driver);
+	if (rc)
+		fc_release_transport(ibmvfc_transport_template);
+	return rc;
+}
+
+/**
+ * ibmvfc_module_exit - Teardown the ibmvfc module
+ *
+ * Return value:
+ * 	nothing
+ **/
+static void __exit ibmvfc_module_exit(void)
+{
+	vio_unregister_driver(&ibmvfc_driver);
+	fc_release_transport(ibmvfc_transport_template);
+}
+
+module_init(ibmvfc_module_init);
+module_exit(ibmvfc_module_exit);
diff -puN drivers/scsi/Kconfig~ibmvfc_driver2 drivers/scsi/Kconfig
--- linux-2.6/drivers/scsi/Kconfig~ibmvfc_driver2	2008-06-23 16:29:44.000000000 -0500
+++ linux-2.6-bjking1/drivers/scsi/Kconfig	2008-06-23 16:29:44.000000000 -0500
@@ -888,6 +888,25 @@ config SCSI_IBMVSCSIS
 	  To compile this driver as a module, choose M here: the
 	  module will be called ibmvstgt.
 
+config SCSI_IBMVFC
+	tristate "IBM Virtual FC support"
+	depends on PPC_PSERIES && SCSI
+	select SCSI_FC_ATTRS
+	help
+	  This is the IBM POWER Virtual FC Client
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ibmvfc.
+
+config SCSI_IBMVFC_TRACE
+	bool "enable driver internal trace"
+	depends on SCSI_IBMVFC
+	default y
+	help
+	  If you say Y here, the driver will trace all commands issued
+	  to the adapter. Performance impact is minimal. Trace can be
+	  dumped using /sys/class/scsi_host/hostXX/trace.
+
 config SCSI_INITIO
 	tristate "Initio 9100U(W) support"
 	depends on PCI && SCSI
diff -puN drivers/scsi/ibmvscsi/Makefile~ibmvfc_driver2 drivers/scsi/ibmvscsi/Makefile
--- linux-2.6/drivers/scsi/ibmvscsi/Makefile~ibmvfc_driver2	2008-06-23 16:29:44.000000000 -0500
+++ linux-2.6-bjking1/drivers/scsi/ibmvscsi/Makefile	2008-06-23 16:29:44.000000000 -0500
@@ -5,3 +5,4 @@ ibmvscsic-$(CONFIG_PPC_ISERIES)	+= iseri
 ibmvscsic-$(CONFIG_PPC_PSERIES)	+= rpa_vscsi.o 
 
 obj-$(CONFIG_SCSI_IBMVSCSIS)	+= ibmvstgt.o
+obj-$(CONFIG_SCSI_IBMVFC)	+= ibmvfc.o
diff -puN drivers/scsi/Makefile~ibmvfc_driver2 drivers/scsi/Makefile
--- linux-2.6/drivers/scsi/Makefile~ibmvfc_driver2	2008-06-23 16:29:44.000000000 -0500
+++ linux-2.6-bjking1/drivers/scsi/Makefile	2008-06-23 16:29:44.000000000 -0500
@@ -118,6 +118,7 @@ obj-$(CONFIG_SCSI_IPR)		+= ipr.o
 obj-$(CONFIG_SCSI_SRP)		+= libsrp.o
 obj-$(CONFIG_SCSI_IBMVSCSI)	+= ibmvscsi/
 obj-$(CONFIG_SCSI_IBMVSCSIS)	+= ibmvscsi/
+obj-$(CONFIG_SCSI_IBMVFC)	+= ibmvscsi/
 obj-$(CONFIG_SCSI_HPTIOP)	+= hptiop.o
 obj-$(CONFIG_SCSI_STEX)		+= stex.o
 obj-$(CONFIG_SCSI_MVSAS)	+= mvsas.o
_
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