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linux/drivers/scsi/be2iscsi/be_iscsi.c
Mike Christie fa95d206e4 [SCSI] be2iscsi: fix disconnection cleanup 
This patch fixes 4 bugs in the connection connect/disconnect
cleanup path.

1. If beiscsi_open_conn fails beiscsi_free_ep was always being
called, and if beiscsi_open_conn failed because beiscsi_get_cid
failed then we would free an unallocated cid.

2. If beiscsi_ep_connect failed due to a beiscsi_open_conn failure
it was leaking iscsi_endpoints.

3. beiscsi_ep_disconnect was leaking iscsi_endpoints.
beiscsi_ep_disconnect should free the iscsi_endpoint. We cannot
do it in beiscsi_conn_stop because that is only called for
iscsi connection cleanup. If beiscsi_ep_connect returns
success, but then the poll function fails or the connect
times out then beiscsi_ep_disconnect will be called to clean
up the ep. The conn_stop callout will not be called in that path.

4. beiscsi_conn_stop was freeing the iscsi_endpoint then accessing
it a couple lines later.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2010-07-27 12:01:39 -05:00

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/**
* Copyright (C) 2005 - 2010 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 beiscsi_hba *phba;
struct iscsi_session *sess;
struct beiscsi_session *beiscsi_sess;
struct beiscsi_io_task *io_task;
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(*beiscsi_sess),
sizeof(*io_task),
initial_cmdsn, ISCSI_MAX_TARGET);
if (!cls_session)
return NULL;
sess = cls_session->dd_data;
beiscsi_sess = sess->dd_data;
beiscsi_sess->bhs_pool = pci_pool_create("beiscsi_bhs_pool",
phba->pcidev,
sizeof(struct be_cmd_bhs),
64, 0);
if (!beiscsi_sess->bhs_pool)
goto destroy_sess;
return cls_session;
destroy_sess:
iscsi_session_teardown(cls_session);
return NULL;
}
/**
* 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_session *sess = cls_session->dd_data;
struct beiscsi_session *beiscsi_sess = sess->dd_data;
SE_DEBUG(DBG_LVL_8, "In beiscsi_session_destroy\n");
pci_pool_destroy(beiscsi_sess->bhs_pool);
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;
struct iscsi_session *sess;
struct beiscsi_session *beiscsi_sess;
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;
sess = cls_session->dd_data;
beiscsi_sess = sess->dd_data;
beiscsi_conn->beiscsi_sess = beiscsi_sess;
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;
SE_DEBUG(DBG_LVL_8, "In beiscsi_conn_get_param, param= %d\n", param);
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;
SE_DEBUG(DBG_LVL_8, "In beiscsi_conn_set_param, param= %d\n", param);
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->max_burst > 262144)
session->max_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);
struct be_cmd_resp_get_mac_addr *resp;
struct be_mcc_wrb *wrb;
unsigned int tag, wrb_num;
int len = 0;
unsigned short status, extd_status;
struct be_queue_info *mccq = &phba->ctrl.mcc_obj.q;
SE_DEBUG(DBG_LVL_8, "In beiscsi_get_host_param, param= %d\n", param);
switch (param) {
case ISCSI_HOST_PARAM_HWADDRESS:
tag = be_cmd_get_mac_addr(phba);
if (!tag) {
SE_DEBUG(DBG_LVL_1, "be_cmd_get_mac_addr Failed \n");
return -1;
} else
wait_event_interruptible(phba->ctrl.mcc_wait[tag],
phba->ctrl.mcc_numtag[tag]);
wrb_num = (phba->ctrl.mcc_numtag[tag] & 0x00FF0000) >> 16;
extd_status = (phba->ctrl.mcc_numtag[tag] & 0x0000FF00) >> 8;
status = phba->ctrl.mcc_numtag[tag] & 0x000000FF;
if (status || extd_status) {
SE_DEBUG(DBG_LVL_1, "be_cmd_get_mac_addr Failed"
" status = %d extd_status = %d \n",
status, extd_status);
free_mcc_tag(&phba->ctrl, tag);
return -1;
} else {
wrb = queue_get_wrb(mccq, wrb_num);
free_mcc_tag(&phba->ctrl, tag);
resp = embedded_payload(wrb);
memcpy(phba->mac_address, resp->mac_address, ETH_ALEN);
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;
SE_DEBUG(DBG_LVL_8, "In beiscsi_conn_start\n");
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");
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_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 beiscsi_endpoint *beiscsi_ep)
{
struct beiscsi_hba *phba = beiscsi_ep->phba;
beiscsi_put_cid(phba, beiscsi_ep->ep_cid);
beiscsi_ep->phba = NULL;
}
/**
* 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;
struct be_queue_info *mccq = &phba->ctrl.mcc_obj.q;
struct be_mcc_wrb *wrb;
struct tcp_connect_and_offload_out *ptcpcnct_out;
unsigned short status, extd_status;
unsigned int tag, wrb_num;
int ret = -1;
SE_DEBUG(DBG_LVL_8, "In beiscsi_open_conn\n");
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 -
phba->fw_config.iscsi_cid_start] = ep;
if (beiscsi_ep->ep_cid > (phba->fw_config.iscsi_cid_start +
phba->params.cxns_per_ctrl * 2)) {
SE_DEBUG(DBG_LVL_1, "Failed in allocate iscsi cid\n");
goto free_ep;
}
beiscsi_ep->cid_vld = 0;
tag = mgmt_open_connection(phba, dst_addr, beiscsi_ep);
if (!tag) {
SE_DEBUG(DBG_LVL_1,
"mgmt_open_connection Failed for cid=%d \n",
beiscsi_ep->ep_cid);
} else {
wait_event_interruptible(phba->ctrl.mcc_wait[tag],
phba->ctrl.mcc_numtag[tag]);
}
wrb_num = (phba->ctrl.mcc_numtag[tag] & 0x00FF0000) >> 16;
extd_status = (phba->ctrl.mcc_numtag[tag] & 0x0000FF00) >> 8;
status = phba->ctrl.mcc_numtag[tag] & 0x000000FF;
if (status || extd_status) {
SE_DEBUG(DBG_LVL_1, "mgmt_open_connection Failed"
" status = %d extd_status = %d\n",
status, extd_status);
free_mcc_tag(&phba->ctrl, tag);
goto free_ep;
} else {
wrb = queue_get_wrb(mccq, wrb_num);
free_mcc_tag(&phba->ctrl, tag);
ptcpcnct_out = embedded_payload(wrb);
beiscsi_ep = ep->dd_data;
beiscsi_ep->fw_handle = ptcpcnct_out->connection_handle;
beiscsi_ep->cid_vld = 1;
SE_DEBUG(DBG_LVL_8, "mgmt_open_connection Success\n");
}
return 0;
free_ep:
beiscsi_free_ep(beiscsi_ep);
return -1;
}
/**
* 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);
}
if (phba->state != BE_ADAPTER_UP) {
ret = -EBUSY;
SE_DEBUG(DBG_LVL_1, "The Adapter state is Not UP \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;
beiscsi_ep->openiscsi_ep = ep;
if (beiscsi_open_conn(ep, NULL, dst_addr, non_blocking)) {
SE_DEBUG(DBG_LVL_1, "Failed in beiscsi_open_conn \n");
ret = -ENOMEM;
goto free_ep;
}
return ep;
free_ep:
iscsi_destroy_endpoint(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 beiscsi_endpoint *beiscsi_ep, int flag)
{
int ret = 0;
unsigned int tag;
struct beiscsi_hba *phba = beiscsi_ep->phba;
tag = mgmt_upload_connection(phba, beiscsi_ep->ep_cid, flag);
if (!tag) {
SE_DEBUG(DBG_LVL_8, "upload failed for cid 0x%x",
beiscsi_ep->ep_cid);
ret = -1;
} else {
wait_event_interruptible(phba->ctrl.mcc_wait[tag],
phba->ctrl.mcc_numtag[tag]);
free_mcc_tag(&phba->ctrl, tag);
}
return ret;
}
/**
* 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_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;
unsigned int tag;
unsigned short savecfg_flag = CMD_ISCSI_SESSION_SAVE_CFG_ON_FLASH;
beiscsi_ep = ep->dd_data;
phba = beiscsi_ep->phba;
SE_DEBUG(DBG_LVL_8, "In beiscsi_ep_disconnect for ep_cid = %d\n",
beiscsi_ep->ep_cid);
if (!beiscsi_ep->conn) {
SE_DEBUG(DBG_LVL_8, "In beiscsi_ep_disconnect, no "
"beiscsi_ep\n");
return;
}
beiscsi_conn = beiscsi_ep->conn;
iscsi_suspend_queue(beiscsi_conn->conn);
SE_DEBUG(DBG_LVL_8, "In beiscsi_ep_disconnect ep_cid = %d\n",
beiscsi_ep->ep_cid);
tag = mgmt_invalidate_connection(phba, beiscsi_ep,
beiscsi_ep->ep_cid, 1,
savecfg_flag);
if (!tag) {
SE_DEBUG(DBG_LVL_1,
"mgmt_invalidate_connection Failed for cid=%d \n",
beiscsi_ep->ep_cid);
} else {
wait_event_interruptible(phba->ctrl.mcc_wait[tag],
phba->ctrl.mcc_numtag[tag]);
free_mcc_tag(&phba->ctrl, tag);
}
beiscsi_close_conn(beiscsi_ep, CONNECTION_UPLOAD_GRACEFUL);
beiscsi_free_ep(beiscsi_ep);
beiscsi_unbind_conn_to_cid(phba, beiscsi_ep->ep_cid);
iscsi_destroy_endpoint(beiscsi_ep->openiscsi_ep);
}
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