[SCSI] be2iscsi: add 10Gbps iSCSI - BladeEngine 2 driver

[v2: fixed up virt_to_bus() issue spotted by sfr]
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: Jayamohan Kallickal <jayamohank@serverengines.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 646 insertions, 0 deletions

diff --git a/drivers/scsi/be2iscsi/be_iscsi.c b/drivers/scsi/be2iscsi/be_iscsi.c
new file mode 100644
index 000000000000..b23526cb39d7
--- /dev/null
+++ b/drivers/scsi/be2iscsi/be_iscsi.c
@@ -0,0 +1,646 @@
+/**
+ * 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 Scsi_Host *shost;
+        struct beiscsi_endpoint *beiscsi_ep;
+        struct iscsi_cls_session *cls_session;
+        struct iscsi_session *sess;
+        struct beiscsi_hba *phba;
+        struct iscsi_task *task;
+        struct beiscsi_io_task *io_task;
+        unsigned int max_size, num_cmd;
+        dma_addr_t bus_add;
+        u64 pa_addr;
+        void *vaddr;
+
+        SE_DEBUG(DBG_LVL_8, "In beiscsi_session_create\n");
+
+        if (!ep) {
+                SE_DEBUG(DBG_LVL_1, "beiscsi_session_create: invalid ep \n");
+                return NULL;
+        }
+        beiscsi_ep = ep->dd_data;
+        phba = beiscsi_ep->phba;
+        shost = phba->shost;
+        if (cmds_max > beiscsi_ep->phba->params.wrbs_per_cxn) {
+                shost_printk(KERN_ERR, shost, "Cannot handle %d cmds."
+                             "Max cmds per session supported is %d. Using %d. "
+                             "\n", cmds_max,
+                              beiscsi_ep->phba->params.wrbs_per_cxn,
+                              beiscsi_ep->phba->params.wrbs_per_cxn);
+                cmds_max = beiscsi_ep->phba->params.wrbs_per_cxn;
+        }
+
+         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;
+        max_size = ALIGN(sizeof(struct be_cmd_bhs), 64) * sess->cmds_max;
+        vaddr = pci_alloc_consistent(phba->pcidev, max_size, &bus_add);
+        pa_addr = (__u64) bus_add;
+
+        for (num_cmd = 0; num_cmd < sess->cmds_max; num_cmd++) {
+                task = sess->cmds[num_cmd];
+                io_task = task->dd_data;
+                io_task->cmd_bhs = vaddr;
+                io_task->bhs_pa.u.a64.address = pa_addr;
+                io_task->alloc_size = max_size;
+                vaddr += ALIGN(sizeof(struct be_cmd_bhs), 64);
+                pa_addr += ALIGN(sizeof(struct be_cmd_bhs), 64);
+        }
+        return cls_session;
+}
+
+/**
+ * beiscsi_session_destroy - destroys iscsi session
+ * @cls_session:        pointer to iscsi cls session
+ *
+ * Destroys iSCSI session instance and releases
+ * resources allocated for it.
+ */
+void beiscsi_session_destroy(struct iscsi_cls_session *cls_session)
+{
+        struct iscsi_task *task;
+        struct beiscsi_io_task *io_task;
+        struct iscsi_session *sess = cls_session->dd_data;
+        struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
+        struct beiscsi_hba *phba = iscsi_host_priv(shost);
+
+        task = sess->cmds[0];
+        io_task = task->dd_data;
+        pci_free_consistent(phba->pcidev,
+                            io_task->alloc_size,
+                            io_task->cmd_bhs,
+                            io_task->bhs_pa.u.a64.address);
+        iscsi_session_teardown(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->conn = conn;
+        return cls_conn;
+}
+
+/**
+ * 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
+ */
+static 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_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:
+                if (beiscsi_ep->ip_type == BE2_IPV4)
+                        len = sprintf(buf, "%pI4\n", &beiscsi_ep->dst_addr);
+                else
+                        len = sprintf(buf, "%pI6\n", &beiscsi_ep->dst6_addr);
+                break;
+        default:
+                return iscsi_conn_get_param(cls_conn, param, buf);
+        }
+        return len;
+}
+
+int beiscsi_set_param(struct iscsi_cls_conn *cls_conn,
+                      enum iscsi_param param, char *buf, int buflen)
+{
+        struct iscsi_conn *conn = cls_conn->dd_data;
+        struct iscsi_session *session = conn->session;
+        int ret;
+
+        ret = iscsi_set_param(cls_conn, param, buf, buflen);
+        if (ret)
+                return ret;
+        /*
+         * If userspace tried to set the value to higher than we can
+         * support override here.
+         */
+        switch (param) {
+        case ISCSI_PARAM_FIRST_BURST:
+                if (session->first_burst > 8192)
+                        session->first_burst = 8192;
+                break;
+        case ISCSI_PARAM_MAX_RECV_DLENGTH:
+                if (conn->max_recv_dlength > 65536)
+                        conn->max_recv_dlength = 65536;
+                break;
+        case ISCSI_PARAM_MAX_BURST:
+                if (session->first_burst > 262144)
+                        session->first_burst = 262144;
+                break;
+        default:
+                return 0;
+        }
+
+        return 0;
+}
+
+/**
+ * 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;
+        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 void  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,
+                      conn->max_xmit_dlength);
+        AMAP_SET_BITS(struct amap_beiscsi_offload_params, first_burst_length,
+                      params, session->first_burst);
+        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));
+}
+
+/**
+ * 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, 0, sizeof(struct beiscsi_offload_params));
+        beiscsi_ep = beiscsi_conn->ep;
+        if (!beiscsi_ep)
+                SE_DEBUG(DBG_LVL_1, "In beiscsi_conn_start , no beiscsi_ep\n");
+
+        free_mgmt_sgl_handle(phba, beiscsi_conn->plogin_sgl_handle);
+        beiscsi_conn->login_in_progress = 0;
+        beiscsi_set_params_for_offld(beiscsi_conn, &params);
+        beiscsi_offload_connection(beiscsi_conn, &params);
+        iscsi_conn_start(cls_conn);
+        return 0;
+}
+
+/**
+ * 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;
+}
+
+/**
+ * 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
+ */
+static 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;
+        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] = ep;
+        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;
+        }
+
+        beiscsi_ep->cid_vld = 0;
+        return mgmt_open_connection(phba, dst_addr, beiscsi_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_free_ep - free endpoint
+ * @ep: pointer to iscsi endpoint structure
+ */
+static 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_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;
+
+        SE_DEBUG(DBG_LVL_8, "In beiscsi_ep_connect \n");
+        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;
+
+        SE_DEBUG(DBG_LVL_8, "In  beiscsi_ep_poll\n");
+        if (beiscsi_ep->cid_vld == 1)
+                return 1;
+        else
+                return 0;
+}
+
+/**
+ * beiscsi_close_conn - Upload the  connection
+ * @ep: The iscsi endpoint
+ * @flag: The type of connection closure
+ */
+static 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;
+}
+
+/**
+ * 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_queue(beiscsi_conn->conn);
+                beiscsi_close_conn(ep, flag);
+        }
+
+        beiscsi_free_ep(ep);
+}
+
+/**
+ * beiscsi_unbind_conn_to_cid - Unbind the beiscsi_conn from phba conn 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_conn_stop - Invalidate and stop the connection
+ * @cls_conn: pointer to get iscsi_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;
+
+        SE_DEBUG(DBG_LVL_8, "In beiscsi_conn_stop\n");
+        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, 1,
+                                            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);
+}