[PATCH 4/6] RFC: beiscsi: iscsi hook in and handling code

* [PATCH 4/6] RFC: beiscsi: iscsi hook in and handling code
@ 2009-08-13  7:11 Jayamohan Kallickal
  2009-08-15 23:22 ` Mike Christie
  0 siblings, 1 reply; 4+ messages in thread
From: Jayamohan Kallickal @ 2009-08-13  7:11 UTC (permalink / raw)
  To: linux-scsi

These files contain code to interface with open-iscsi layer

Signed-off-by: Jayamohan Kallickal <jayamohank@serverengines.com>
---
 drivers/scsi/beiscsi/be.h       |  185 ++++++++++++
 drivers/scsi/beiscsi/be_iscsi.c |  628 +++++++++++++++++++++++++++++++++++++++
 drivers/scsi/beiscsi/be_iscsi.h |   89 ++++++
 3 files changed, 902 insertions(+), 0 deletions(-)
 create mode 100644 drivers/scsi/beiscsi/be.h
 create mode 100644 drivers/scsi/beiscsi/be_iscsi.c
 create mode 100644 drivers/scsi/beiscsi/be_iscsi.h

diff --git a/drivers/scsi/beiscsi/be.h b/drivers/scsi/beiscsi/be.h
new file mode 100644
index 0000000..a8d9996
--- /dev/null
+++ b/drivers/scsi/beiscsi/be.h
@@ -0,0 +1,185 @@
+/*
+ * Copyright (C) 2005 - 2009 ServerEngines
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.  The full GNU General
+ * Public License is included in this distribution in the file called COPYING.
+ *
+ * Contact Information:
+ * linux-drivers@serverengines.com
+ *
+ * ServerEngines
+ * 209 N. Fair Oaks Ave
+ * Sunnyvale, CA 94085
+ */
+
+#ifndef BEISCSI_H
+#define BEISCSI_H
+
+#include <linux/pci.h>
+#include <linux/if_vlan.h>
+
+#define FW_VER_LEN 32
+
+struct be_dma_mem {
+	void *va;
+	dma_addr_t dma;
+	u32 size;
+};
+
+struct be_queue_info {
+	struct be_dma_mem dma_mem;
+	u16 len;
+	u16 entry_size;		/* Size of an element in the queue */
+	u16 id;
+	u16 tail, head;
+	bool created;
+	atomic_t used;		/* Number of valid elements in the queue */
+};
+
+static inline u32 MODULO(u16 val, u16 limit)
+{
+	WARN_ON(limit & (limit - 1));
+	return val & (limit - 1);
+}
+
+static inline void index_inc(u16 *index, u16 limit)
+{
+	*index = MODULO((*index + 1), limit);
+}
+
+static inline void *queue_head_node(struct be_queue_info *q)
+{
+	return q->dma_mem.va + q->head * q->entry_size;
+}
+
+static inline void *queue_tail_node(struct be_queue_info *q)
+{
+	return q->dma_mem.va + q->tail * q->entry_size;
+}
+
+static inline void queue_head_inc(struct be_queue_info *q)
+{
+	index_inc(&q->head, q->len);
+}
+
+static inline void queue_tail_inc(struct be_queue_info *q)
+{
+	index_inc(&q->tail, q->len);
+}
+
+/*ISCSI */
+
+#define DEFAULT_MAX_BURST_LENGTH 262144
+
+struct be_eq_obj {
+	struct be_queue_info q;
+	char desc[32];
+
+	/* Adaptive interrupt coalescing (AIC) info */
+	bool enable_aic;
+	u16 min_eqd;		/* in usecs */
+	u16 max_eqd;		/* in usecs */
+	u16 cur_eqd;		/* in usecs */
+};
+
+struct be_mcc_obj {
+	struct be_queue_info *q;
+	struct be_queue_info *cq;
+};
+
+struct be_ctrl_info {
+	u8 __iomem *csr;
+	u8 __iomem *db;		/* Door Bell */
+	u8 __iomem *pcicfg;	/* PCI config space */
+	struct pci_dev *pdev;
+
+	/* Mbox used for cmd request/response */
+	spinlock_t mbox_lock;	/* For serializing mbox cmds to BE card */
+	struct be_dma_mem mbox_mem;
+	/* Mbox mem is adjusted to align to 16 bytes. The allocated addr
+	 * is stored for freeing purpose */
+	struct be_dma_mem mbox_mem_alloced;
+
+	/* MCC Rings */
+	struct be_mcc_obj mcc_obj;
+	spinlock_t mcc_lock;	/* For serializing mcc cmds to BE card */
+	spinlock_t mcc_cq_lock;
+
+	/* MCC Async callback */
+	void (*async_cb) (void *adapter, bool link_up);
+	void *adapter_ctxt;
+};
+
+#include "be_cmds.h"
+
+#define PAGE_SHIFT_4K 12
+#define PAGE_SIZE_4K (1 << PAGE_SHIFT_4K)
+
+/* Returns number of pages spanned by the data starting at the given addr */
+#define PAGES_4K_SPANNED(_address, size) 				\
+		((u32)((((size_t)(_address) & (PAGE_SIZE_4K - 1)) + 	\
+			(size) + (PAGE_SIZE_4K - 1)) >> PAGE_SHIFT_4K))
+
+/* Byte offset into the page corresponding to given address */
+#define OFFSET_IN_PAGE(addr)						\
+		((size_t)(addr) & (PAGE_SIZE_4K-1))
+
+/* Returns bit offset within a DWORD of a bitfield */
+#define AMAP_BIT_OFFSET(_struct, field)  				\
+		(((size_t)&(((_struct *)0)->field))%32)
+
+/* Returns the bit mask of the field that is NOT shifted into location. */
+static inline u32 amap_mask(u32 bitsize)
+{
+	return (bitsize == 32 ? 0xFFFFFFFF : (1 << bitsize) - 1);
+}
+
+static inline void amap_set(void *ptr, u32 dw_offset, u32 mask,
+					u32 offset, u32 value)
+{
+	u32 *dw = (u32 *) ptr + dw_offset;
+	*dw &= ~(mask << offset);
+	*dw |= (mask & value) << offset;
+}
+
+#define AMAP_SET_BITS(_struct, field, ptr, val)				\
+		amap_set(ptr,						\
+			offsetof(_struct, field)/32,			\
+			amap_mask(sizeof(((_struct *)0)->field)),	\
+			AMAP_BIT_OFFSET(_struct, field),		\
+			val)
+
+static inline u32 amap_get(void *ptr, u32 dw_offset, u32 mask, u32 offset)
+{
+	u32 *dw = ptr;
+	return mask & (*(dw + dw_offset) >> offset);
+}
+
+#define AMAP_GET_BITS(_struct, field, ptr)				\
+		amap_get(ptr,						\
+			offsetof(_struct, field)/32,			\
+			amap_mask(sizeof(((_struct *)0)->field)),	\
+			AMAP_BIT_OFFSET(_struct, field))
+
+#define be_dws_cpu_to_le(wrb, len) swap_dws(wrb, len)
+#define be_dws_le_to_cpu(wrb, len) swap_dws(wrb, len)
+static inline void swap_dws(void *wrb, int len)
+{
+#ifdef __BIG_ENDIAN
+	u32 *dw = wrb;
+	WARN_ON(len % 4);
+	do {
+		*dw = cpu_to_le32(*dw);
+		dw++;
+		len -= 4;
+	} while (len);
+#endif /* __BIG_ENDIAN */
+}
+
+extern void be_cq_notify(struct be_ctrl_info *ctrl, u16 qid, bool arm,
+		u16 num_popped);
+
+#endif /* BEISCSI_H */
diff --git a/drivers/scsi/beiscsi/be_iscsi.c b/drivers/scsi/beiscsi/be_iscsi.c
new file mode 100644
index 0000000..ab70cba
--- /dev/null
+++ b/drivers/scsi/beiscsi/be_iscsi.c
@@ -0,0 +1,628 @@
+/*
+ * Copyright (C) 2005 - 2009 ServerEngines
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.  The full GNU General
+ * Public License is included in this distribution in the file called COPYING.
+ *
+ * Written by: Jayamohan Kallickal (jayamohank@serverengines.com)
+ *
+ * Contact Information:
+ * linux-drivers@serverengines.com
+ *
+ * ServerEngines
+ * 209 N. Fair Oaks Ave
+ * Sunnyvale, CA 94085
+ *
+ */
+
+#include <scsi/libiscsi.h>
+#include <scsi/scsi_transport_iscsi.h>
+#include <scsi/scsi_transport.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi.h>
+
+#include "be_iscsi.h"
+
+extern struct iscsi_transport beiscsi_iscsi_transport;
+
+/*
+ * beiscsi_session_create: creates a new iscsi session
+ * cmds_max:		max commands supported
+ * qdepth:		max queue depth supported
+ * initial_cmdsn:	initial iscsi CMDSN
+ */
+struct iscsi_cls_session *beiscsi_session_create(struct iscsi_endpoint *ep,
+						u16 cmds_max,
+						u16 qdepth,
+						u32 initial_cmdsn)
+{
+	struct iscsi_cls_session *cls_session;
+	struct iscsi_session *sess;
+	struct Scsi_Host *shost;
+	struct beiscsi_endpoint *beiscsi_ep;
+	struct iscsi_task *task;
+	struct beiscsi_io_task *io_task;
+	int num_cmd;
+
+	if (!ep) {
+		SE_DEBUG(DBG_LVL_1, "beiscsi_session_create: invalid ep \n");
+		return NULL;
+	}
+	beiscsi_ep = (struct beiscsi_endpoint *)ep->dd_data;
+	shost = beiscsi_ep->phba->shost;
+
+	cls_session =
+		iscsi_session_setup(&beiscsi_iscsi_transport, shost, cmds_max,
+				sizeof(struct beiscsi_io_task), initial_cmdsn,
+				ISCSI_MAX_TARGET);
+	if (!cls_session)
+		return NULL;
+	sess = cls_session->dd_data;
+
+	shost->can_queue = sess->cmds_max;
+	for (num_cmd = 0; num_cmd < sess->cmds_max; num_cmd++) {
+		task = sess->cmds[num_cmd];
+		io_task = task->dd_data;
+		task->hdr = (struct iscsi_hdr *)&io_task->cmd_bhs.iscsi_hdr;
+		task->hdr_max = sizeof(struct be_cmd_bhs);
+	}
+	return cls_session;
+}
+
+/*
+ * beiscsi_conn_create: create an instance of iscsi connection
+ * cls_session :	ptr to iscsi_cls_session
+ * cid:			iscsi cid
+ */
+struct iscsi_cls_conn *beiscsi_conn_create(struct iscsi_cls_session
+					*cls_session, u32 cid)
+{
+	struct beiscsi_hba *phba;
+	struct Scsi_Host *shost;
+	struct iscsi_cls_conn *cls_conn;
+	struct beiscsi_conn *beiscsi_conn;
+	struct iscsi_conn *conn;
+
+	SE_DEBUG(DBG_LVL_8, "In beiscsi_conn_create ,cid"
+			"from iscsi layer=%d\n", cid);
+	shost = iscsi_session_to_shost(cls_session);
+	phba = iscsi_host_priv(shost);
+
+	cls_conn = iscsi_conn_setup(cls_session, sizeof(*beiscsi_conn), cid);
+	if (!cls_conn)
+		return NULL;
+
+	conn = cls_conn->dd_data;
+	beiscsi_conn = conn->dd_data;
+	beiscsi_conn->ep = NULL;
+	beiscsi_conn->phba = phba;
+	beiscsi_conn->exp_statsn = 0xDEADBEEF;
+	beiscsi_conn->conn = conn;
+
+	return cls_conn;
+}
+
+/*
+ * beiscsi_session_destroy: destroy the iscsi session
+ * cls_session :	ptr to iscsi_cls_session
+ */
+void beiscsi_session_destroy(struct iscsi_cls_session *cls_session)
+{
+	iscsi_session_teardown(cls_session);
+}
+
+/*
+ * beiscsi_conn_destroy: destroy the iscsi connection
+ * cls_conn :		ptr to iscsi_cls_conn
+ */
+void beiscsi_conn_destroy(struct iscsi_cls_conn *cls_conn)
+{
+	iscsi_conn_teardown(cls_conn);
+}
+
+/* beiscsi_conn_bind:  Binds iscsi session/connection with TCP connection
+ * @cls_session:	pointer to iscsi cls session
+ * @cls_conn:		pointer to iscsi cls conn
+ * transport_fd:	EP handle(64 bit)
+ * This function binds the TCP Conn with iSCSI Connection and Session.
+ */
+int beiscsi_conn_bind(struct iscsi_cls_session *cls_session,
+			struct iscsi_cls_conn *cls_conn,
+			u64 transport_fd, int is_leading)
+{
+	struct iscsi_conn *conn = cls_conn->dd_data;
+	struct beiscsi_conn *beiscsi_conn = conn->dd_data;
+	struct Scsi_Host *shost =
+		(struct Scsi_Host *)iscsi_session_to_shost(cls_session);
+	struct beiscsi_hba *phba = (struct beiscsi_hba *)iscsi_host_priv(shost);
+	struct beiscsi_endpoint *beiscsi_ep;
+	struct iscsi_endpoint *ep;
+
+	SE_DEBUG(DBG_LVL_8, "In beiscsi_conn_bind\n");
+	ep = iscsi_lookup_endpoint(transport_fd);
+	if (!ep)
+		return -EINVAL;
+
+	beiscsi_ep = ep->dd_data;
+
+	if (iscsi_conn_bind(cls_session, cls_conn, is_leading))
+		return -EINVAL;
+
+	if (beiscsi_ep->phba != phba) {
+		SE_DEBUG(DBG_LVL_8,
+			"beiscsi_ep->hba=%p not equal to phba=%p \n",
+					beiscsi_ep->phba, phba);
+		return -EEXIST;
+	}
+
+	beiscsi_conn->beiscsi_conn_cid = beiscsi_ep->ep_cid;
+	beiscsi_conn->ep = beiscsi_ep;
+	beiscsi_ep->conn = beiscsi_conn;
+	SE_DEBUG(DBG_LVL_8, "beiscsi_conn=%p conn=%p ep_cid=%d \n",
+				beiscsi_conn, conn, beiscsi_ep->ep_cid);
+	return beiscsi_bindconn_cid(phba, beiscsi_conn, beiscsi_ep->ep_cid);
+}
+
+/* beiscsi_conn_get_param: get the iscsi parameter
+ * cls_conn:		pointer to iscsi cls conn
+ * param:	parameter type identifier
+ * buf:	buffer pointer
+ * returns iscsi parameter
+ */
+
+int beiscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
+			enum iscsi_param param, char *buf)
+{
+	struct beiscsi_endpoint *beiscsi_ep;
+	struct iscsi_conn *conn = cls_conn->dd_data;
+	struct beiscsi_conn *beiscsi_conn = conn->dd_data;
+	int len = 0;
+
+	beiscsi_ep = beiscsi_conn->ep;
+	if (!beiscsi_ep) {
+		SE_DEBUG(DBG_LVL_1,
+			"In beiscsi_conn_get_param , no beiscsi_ep\n");
+		return -1;
+	}
+
+	switch (param) {
+	case ISCSI_PARAM_CONN_PORT:
+		len = sprintf(buf, "%hu\n", beiscsi_ep->dst_tcpport);
+		break;
+	case ISCSI_PARAM_CONN_ADDRESS:
+		len = sprintf(buf, "%u.%u.%u.%u\n",
+			((unsigned char *)&beiscsi_ep->dst_addr)[0],
+			((unsigned char *)&beiscsi_ep->dst_addr)[1],
+			((unsigned char *)&beiscsi_ep->dst_addr)[2],
+			((unsigned char *)&beiscsi_ep->dst_addr)[3]);
+		break;
+	default:
+		return iscsi_conn_get_param(cls_conn, param, buf);
+	}
+
+	return len;
+}
+
+/* beiscsi_get_host_param: get the iscsi parameter
+ * shost:	pointer to scsi_host structure
+ * param:	parameter type identifier
+ * buf:		buffer pointer
+ * returns host parameter
+ */
+
+int beiscsi_get_host_param(struct Scsi_Host *shost,
+		enum iscsi_host_param param, char *buf)
+{
+	struct beiscsi_hba *phba = (struct beiscsi_hba *)iscsi_host_priv(shost);
+	int len = 0;
+
+	switch (param) {
+	case ISCSI_HOST_PARAM_HWADDRESS:
+		be_cmd_get_mac_addr(&phba->ctrl, phba->mac_address);
+		len = sysfs_format_mac(buf, phba->mac_address, ETH_ALEN);
+		break;
+	case ISCSI_HOST_PARAM_NETDEV_NAME:
+		   len = sprintf(buf, "beiscsi\n");
+		break;
+	default:
+		return iscsi_host_get_param(shost, param, buf);
+	}
+	return len;
+}
+
+/* beiscsi_conn_get_stats: get the iscsi stats
+ * cls_conn:	pointer to iscsi cls conn
+ * stats:	pointer to iscsi_stats structure
+ * returns iscsi stats
+ */
+void beiscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn,
+				struct iscsi_stats *stats)
+{
+	struct iscsi_conn *conn = cls_conn->dd_data;
+
+	SE_DEBUG(DBG_LVL_8, "In beiscsi_conn_get_stats\n");
+	stats->txdata_octets = conn->txdata_octets;
+	stats->rxdata_octets = conn->rxdata_octets;
+	stats->dataout_pdus = conn->dataout_pdus_cnt;
+	stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
+	stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
+	stats->datain_pdus = conn->datain_pdus_cnt;
+	stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
+	stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
+	stats->r2t_pdus = conn->r2t_pdus_cnt;
+	stats->digest_err = 0;
+	stats->timeout_err = 0;
+	stats->custom_length = 0;
+	strcpy(stats->custom[0].desc, "eh_abort_cnt");
+	stats->custom[0].value = conn->eh_abort_cnt;
+}
+
+/* beiscsi_set_params_for_offld : get the parameters for offload
+ * beiscsi_conn:	pointer to beiscsi_conn
+ * params:		pointer to offload_params structure
+ */
+static int beiscsi_set_params_for_offld(struct beiscsi_conn *beiscsi_conn,
+					struct beiscsi_offload_params *params)
+{
+	struct iscsi_conn *conn = beiscsi_conn->conn;
+	struct iscsi_session *session = conn->session;
+
+	AMAP_SET_BITS(struct amap_beiscsi_offload_params, max_burst_length,
+						params, session->max_burst);
+	AMAP_SET_BITS(struct amap_beiscsi_offload_params,
+		max_send_data_segment_length, params, 8192);
+	AMAP_SET_BITS(struct amap_beiscsi_offload_params, first_burst_length,
+						params, session->first_burst);
+	AMAP_SET_BITS(struct amap_beiscsi_offload_params, first_burst_length,
+								params, 8192);
+	AMAP_SET_BITS(struct amap_beiscsi_offload_params, erl, params,
+							session->erl);
+	AMAP_SET_BITS(struct amap_beiscsi_offload_params, dde, params,
+						conn->datadgst_en);
+	AMAP_SET_BITS(struct amap_beiscsi_offload_params, hde, params,
+						conn->hdrdgst_en);
+	AMAP_SET_BITS(struct amap_beiscsi_offload_params, ir2t, params,
+						session->initial_r2t_en);
+	AMAP_SET_BITS(struct amap_beiscsi_offload_params, imd, params,
+						session->imm_data_en);
+	AMAP_SET_BITS(struct amap_beiscsi_offload_params, exp_statsn, params,
+						(conn->exp_statsn - 1));
+	return 0;
+}
+
+/* beiscsi_conn_start : offload of session to chip
+ * cls_conn:	pointer to beiscsi_conn
+ */
+int beiscsi_conn_start(struct iscsi_cls_conn *cls_conn)
+{
+	struct iscsi_conn *conn = cls_conn->dd_data;
+	struct beiscsi_conn *beiscsi_conn = conn->dd_data;
+	struct beiscsi_endpoint *beiscsi_ep;
+	struct beiscsi_offload_params params;
+
+	struct iscsi_session *session = conn->session;
+	struct Scsi_Host *shost = iscsi_session_to_shost(session->cls_session);
+	struct beiscsi_hba *phba = iscsi_host_priv(shost);
+
+	memset(&params, 0x0, sizeof(struct beiscsi_offload_params));
+	SE_DEBUG(DBG_LVL_8, "beiscsi_conn_start \n");
+	beiscsi_ep = beiscsi_conn->ep;
+	if (!beiscsi_ep)
+		SE_DEBUG(DBG_LVL_1, "In beiscsi_conn_start , no beiscsi_ep\n");
+	free_eh_sgl_handle(phba, beiscsi_conn->plogin_sgl_handle);
+	beiscsi_conn->login_in_progress = 0;
+	iscsi_conn_start(cls_conn);
+	beiscsi_set_params_for_offld(beiscsi_conn, &params);
+	beiscsi_offload_connection(beiscsi_conn, &params);
+	return 0;
+}
+
+/*
+ * beiscsi_ep_connect: Ask chip to create TCP Conn
+ * scsi_host:		Pointer to scsi_host structure
+ * dst_addr:		The IP address of Target
+ * non_blocking:	blocking or non-blocking call
+
+  This routines first asks chip to create a connection and then allocates an EP
+ */
+struct iscsi_endpoint
+	*beiscsi_ep_connect(struct Scsi_Host *shost,
+			struct sockaddr *dst_addr, int non_blocking)
+{
+	struct beiscsi_hba *phba;
+	struct beiscsi_endpoint *beiscsi_ep;
+	struct iscsi_endpoint *ep;
+	int ret;
+
+	if (shost)
+		phba = iscsi_host_priv(shost);
+	else {
+		ret = -ENXIO;
+		SE_DEBUG(DBG_LVL_1, "shost is NULL \n");
+		return ERR_PTR(ret);
+	}
+	ep = iscsi_create_endpoint(sizeof(struct beiscsi_endpoint));
+	if (!ep) {
+		ret = -ENOMEM;
+		return ERR_PTR(ret);
+	}
+
+	beiscsi_ep = ep->dd_data;
+	beiscsi_ep->phba = phba;
+
+	if (beiscsi_open_conn(ep, NULL, dst_addr, non_blocking)) {
+		SE_DEBUG(DBG_LVL_1, "Failed in allocate iscsi cid\n");
+		ret = -ENOMEM;
+		goto free_ep;
+	}
+
+	return ep;
+
+free_ep:
+	beiscsi_free_ep(ep);
+	return ERR_PTR(ret);
+}
+
+/*
+ * beiscsi_ep_poll: Poll to see if connection is established
+ * ep:			endpoint to be used
+ * timeout_ms:		timeout specified in millisecs
+ * Poll to see if TCP connection established
+ */
+int beiscsi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
+{
+	struct beiscsi_endpoint *beiscsi_ep = ep->dd_data;
+
+	if (beiscsi_ep->cid_vld == 1)
+		return 1;
+	else
+		return 0;
+}
+
+/*
+ * beiscsi_cleanup_task: For compatibility with open-iscsi
+ *	as now this function is not an option
+ *
+ */
+void beiscsi_cleanup_task(struct iscsi_task *task)
+{
+
+}
+
+/*
+ * beiscsi_ep_disconnect: Tears down the TCP connection
+ * ep:			endpoint to be used
+ * Tears down the TCP connection
+ */
+void beiscsi_ep_disconnect(struct iscsi_endpoint *ep)
+{
+	struct beiscsi_conn *beiscsi_conn;
+	struct beiscsi_endpoint *beiscsi_ep;
+	struct beiscsi_hba *phba;
+	int flag = 0;
+
+	beiscsi_ep = ep->dd_data;
+	phba = beiscsi_ep->phba;
+	SE_DEBUG(DBG_LVL_8, "In beiscsi_ep_disconnect\n");
+
+	if (beiscsi_ep->conn) {
+		beiscsi_conn = beiscsi_ep->conn;
+		iscsi_suspend_tx(beiscsi_conn->conn);
+		beiscsi_close_conn(ep, flag);
+		beiscsi_conn->ep = NULL;
+	}
+
+	beiscsi_free_ep(ep);
+}
+
+/*
+ * beiscsi_put_cid: Free the cid
+ * phba:	The phba for which the cid is being freed
+ * cid:		The cid to free
+ */
+static void beiscsi_put_cid(struct beiscsi_hba *phba, unsigned short cid)
+{
+	phba->avlbl_cids++;
+	phba->cid_array[phba->cid_free++] = cid;
+	if (phba->cid_free == phba->params.cxns_per_ctrl)
+		phba->cid_free = 0;
+}
+
+/*
+ * beiscsi_bindconn_cid:Bind the beiscsi_conn with
+ *		phba connection table
+ * beiscsi_conn:The pointer to  beiscsi_conn structure
+ * phba:	The phba instance
+ * cid:		The cid to free
+ */
+int beiscsi_bindconn_cid(struct beiscsi_hba *phba,
+		struct beiscsi_conn *beiscsi_conn, unsigned int cid)
+{
+	if (phba->conn_table[cid]) {
+		SE_DEBUG(DBG_LVL_1,
+			"Connection table already occupied. Detected clash\n");
+		return -EINVAL;
+	} else {
+		SE_DEBUG(DBG_LVL_8, "phba->conn_table[%d]=%p(beiscsi_conn) \n",
+							cid, beiscsi_conn);
+		phba->conn_table[cid] = beiscsi_conn;
+	}
+	return 0;
+}
+
+/*
+ * beiscsi_unbind_conn_to_cid:Unbind the beiscsi_conn from
+ *		phba connection table
+ * phba:	The phba instance
+ * cid:		The cid to free
+ */
+
+static int beiscsi_unbind_conn_to_cid(struct beiscsi_hba *phba,
+					unsigned int cid)
+{
+	if (phba->conn_table[cid]) {
+		phba->conn_table[cid] = NULL;
+	} else {
+		SE_DEBUG(DBG_LVL_8, "Connection table Not occupied. \n");
+		return -EINVAL;
+	}
+	return 0;
+}
+
+/*
+ * beiscsi_alloc_ep: Used to allocate a ep
+ * phba:	The phba instance
+ *
+ */
+struct iscsi_endpoint *beiscsi_alloc_ep(struct beiscsi_hba *phba)
+{
+	struct iscsi_endpoint *ep;
+	struct beiscsi_endpoint *beiscsi_ep;
+
+	ep = iscsi_create_endpoint(sizeof(struct beiscsi_endpoint));
+	if (!ep) {
+		SE_DEBUG(DBG_LVL_1, "Failed in iscsi_create_endpoint\n");
+		return NULL;
+	}
+
+	beiscsi_ep = ep->dd_data;
+	beiscsi_ep->phba = phba;
+	return ep;
+}
+
+/*
+ * beiscsi_free_ep: free endpoint
+ * ep:		pointer to iscsi endpoint structure
+ */
+void beiscsi_free_ep(struct iscsi_endpoint *ep)
+{
+	struct beiscsi_endpoint *beiscsi_ep = ep->dd_data;
+	struct beiscsi_hba *phba = beiscsi_ep->phba;
+
+	beiscsi_put_cid(phba, beiscsi_ep->ep_cid);
+	beiscsi_ep->phba = NULL;
+	iscsi_destroy_endpoint(ep);
+}
+
+/*
+ * beiscsi_get_cid:Allocate a cid
+ * phba:	The phba instance
+ */
+
+static int beiscsi_get_cid(struct beiscsi_hba *phba)
+{
+	unsigned short cid = 0xFFFF;
+
+	if (!phba->avlbl_cids)
+		return cid;
+
+	cid = phba->cid_array[phba->cid_alloc++];
+	if (phba->cid_alloc == phba->params.cxns_per_ctrl)
+		phba->cid_alloc = 0;
+	phba->avlbl_cids--;
+	return cid;		/* The cid returned here is
+				 * 0,2,4 ...or 1,3,5,...
+				 */
+}
+
+/*
+ * beiscsi_open_conn: Ask FW to open a TCP connection
+ * ep:		endpoint to be used
+ * src_addr:    The source IP address
+ * dst_addr:    The Destination  IP address
+ * Asks the FW to open a TCP connection
+ */
+int beiscsi_open_conn(struct iscsi_endpoint *ep,
+			struct sockaddr *src_addr,
+			struct sockaddr *dst_addr, int non_blocking)
+{
+	struct beiscsi_endpoint *beiscsi_ep = ep->dd_data;
+	struct beiscsi_hba *phba = beiscsi_ep->phba;
+	struct sockaddr_in *daddr_in = (struct sockaddr_in *)dst_addr;
+	int ret = -1;
+
+	beiscsi_ep->ep_cid = beiscsi_get_cid(phba);
+	if (beiscsi_ep->ep_cid == 0xFFFF) {
+		SE_DEBUG(DBG_LVL_1, "No free cid available\n");
+		return ret;
+	}
+	SE_DEBUG(DBG_LVL_8, "In beiscsi_open_conn, ep_cid=%d ",
+						beiscsi_ep->ep_cid);
+	phba->ep_array[beiscsi_ep->ep_cid] = (unsigned long *)ep;
+	/* Here , the cid values are * 0,2,4 ... or  1,3,5... */
+	if (beiscsi_ep->ep_cid >
+		(phba->fw_config.iscsi_cid_start +
+		phba->params.cxns_per_ctrl)){
+		SE_DEBUG(DBG_LVL_1, "Failed in allocate iscsi cid\n");
+		return ret;
+	}
+
+	daddr_in->sin_port = ISCSI_LISTEN_PORT;
+	beiscsi_ep->cid_vld = 0;
+	ret = mgmt_open_connection(phba, daddr_in->sin_addr.s_addr,
+				daddr_in->sin_port, beiscsi_ep->ep_cid);
+
+	beiscsi_ep->dst_addr = daddr_in->sin_addr.s_addr;
+	beiscsi_ep->dst_tcpport = daddr_in->sin_port;
+
+	return ret;
+}
+
+/* beiscsi_conn_stop : Invalidate and stop the connection
+ * cls_conn:	pointer to beiscsi_conn
+ * flag:	The type of connection closure
+ */
+void beiscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
+{
+	struct iscsi_conn *conn = cls_conn->dd_data;
+	struct beiscsi_conn *beiscsi_conn = conn->dd_data;
+	struct beiscsi_endpoint *beiscsi_ep;
+	struct iscsi_session *session = conn->session;
+	struct Scsi_Host *shost = iscsi_session_to_shost(session->cls_session);
+	struct beiscsi_hba *phba = iscsi_host_priv(shost);
+	unsigned int status;
+
+	unsigned short savecfg_flag = CMD_ISCSI_SESSION_SAVE_CFG_ON_FLASH;
+	beiscsi_ep = beiscsi_conn->ep;
+	if (!beiscsi_ep) {
+		SE_DEBUG(DBG_LVL_8, "In beiscsi_conn_stop , no beiscsi_ep\n");
+		return;
+	}
+	status = mgmt_invalidate_connection(phba, beiscsi_ep,
+		beiscsi_ep->ep_cid, (unsigned short)true, savecfg_flag);
+	if (status != MGMT_STATUS_SUCCESS) {
+		SE_DEBUG(DBG_LVL_1,
+			"mgmt_invalidate_connection Failed for cid=%d \n",
+						beiscsi_ep->ep_cid);
+	}
+	beiscsi_unbind_conn_to_cid(phba, beiscsi_ep->ep_cid);
+
+	iscsi_conn_stop(cls_conn, flag);
+}
+
+/* beiscsi_close_conn : Upload the  connection
+ * ep:			The iscsi endpoint
+ * flag:	The type of connection closure
+ */
+int beiscsi_close_conn(struct iscsi_endpoint *ep, int flag)
+{
+	int ret = 0;
+	struct beiscsi_endpoint *beiscsi_ep = ep->dd_data;
+	struct beiscsi_hba *phba = beiscsi_ep->phba;
+
+	if (MGMT_STATUS_SUCCESS !=
+		mgmt_upload_connection(phba, beiscsi_ep->ep_cid,
+		CONNECTION_UPLOAD_GRACEFUL)) {
+		SE_DEBUG(DBG_LVL_8, "upload failed for cid 0x%x",
+					beiscsi_ep->ep_cid);
+		ret = -1;
+	}
+
+	return ret;
+}
+
diff --git a/drivers/scsi/beiscsi/be_iscsi.h b/drivers/scsi/beiscsi/be_iscsi.h
new file mode 100644
index 0000000..b85d701
--- /dev/null
+++ b/drivers/scsi/beiscsi/be_iscsi.h
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2005 - 2009 ServerEngines
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.  The full GNU General
+ * Public License is included in this distribution in the file called COPYING.
+ *
+ * Written by: Jayamohan Kallickal (jayamohank@serverengines.com)
+ *
+ * Contact Information:
+ * linux-drivers@serverengines.com
+ *
+ * ServerEngines
+ * 209 N. Fair Oaks Ave
+ * Sunnyvale, CA 94085
+ *
+ */
+
+#ifndef _BE_ISCSI_
+#define _BE_ISCSI_
+
+#include "be_main.h"
+#include "be_mgmt.h"
+
+int
+beiscsi_bindconn_cid(struct beiscsi_hba *phba,
+		struct beiscsi_conn *beiscsi_conn, unsigned int cid);
+
+void beiscsi_offload_connection(struct beiscsi_conn *beiscsi_conn,
+				struct beiscsi_offload_params *params);
+
+int beiscsi_close_conn(struct iscsi_endpoint *ep, int flags);
+
+void beiscsi_offload_iscsi(struct beiscsi_hba *phba, struct iscsi_conn *conn,
+		struct beiscsi_conn *beiscsi_conn, unsigned int fw_handle);
+
+struct iscsi_endpoint *beiscsi_alloc_ep(struct beiscsi_hba *hba);
+
+void beiscsi_free_ep(struct iscsi_endpoint *ep);
+
+struct iscsi_cls_session *beiscsi_session_create(struct iscsi_endpoint *ep,
+						 uint16_t cmds_max,
+						 uint16_t qdepth,
+						 uint32_t initial_cmdsn);
+
+struct iscsi_cls_conn *beiscsi_conn_create(struct iscsi_cls_session
+						*cls_session, uint32_t cid);
+
+int beiscsi_conn_bind(struct iscsi_cls_session *cls_session,
+			struct iscsi_cls_conn *cls_conn,
+			uint64_t transport_fd, int is_leading);
+void beiscsi_conn_destroy(struct iscsi_cls_conn *cls_conn);
+
+int beiscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
+				enum iscsi_param param, char *buf);
+
+int
+beiscsi_get_host_param(struct Scsi_Host *shost,
+		enum iscsi_host_param param, char *buf);
+
+int beiscsi_conn_start(struct iscsi_cls_conn *cls_conn);
+
+void beiscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag);
+
+struct iscsi_endpoint *beiscsi_ep_connect(struct Scsi_Host *shost,
+					struct sockaddr *dst_addr,
+						int non_blocking);
+
+void beiscsi_cleanup_task(struct iscsi_task *task);
+
+int beiscsi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms);
+
+void beiscsi_ep_disconnect(struct iscsi_endpoint *ep);
+
+void beiscsi_session_destroy(struct iscsi_cls_session *cls_session);
+
+void beiscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn,
+				struct iscsi_stats *stats);
+
+void beiscsi_parse_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age);
+
+int beiscsi_alloc_pdu(struct iscsi_task *task, u8 opcode);
+struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt);
+
+extern int beiscsi_task_xmit(struct iscsi_task *task);
+
+#endif
-- 
1.6.3


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