xref: /openbmc/linux/drivers/scsi/be2iscsi/be_iscsi.c (revision b6dcefde)
1 /**
2  * Copyright (C) 2005 - 2009 ServerEngines
3  * All rights reserved.
4  *
5  * This program is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU General Public License version 2
7  * as published by the Free Software Foundation.  The full GNU General
8  * Public License is included in this distribution in the file called COPYING.
9  *
10  * Written by: Jayamohan Kallickal (jayamohank@serverengines.com)
11  *
12  * Contact Information:
13  * linux-drivers@serverengines.com
14  *
15  * ServerEngines
16  * 209 N. Fair Oaks Ave
17  * Sunnyvale, CA 94085
18  *
19  */
20 
21 #include <scsi/libiscsi.h>
22 #include <scsi/scsi_transport_iscsi.h>
23 #include <scsi/scsi_transport.h>
24 #include <scsi/scsi_cmnd.h>
25 #include <scsi/scsi_device.h>
26 #include <scsi/scsi_host.h>
27 #include <scsi/scsi.h>
28 
29 #include "be_iscsi.h"
30 
31 extern struct iscsi_transport beiscsi_iscsi_transport;
32 
33 /**
34  * beiscsi_session_create - creates a new iscsi session
35  * @cmds_max: max commands supported
36  * @qdepth: max queue depth supported
37  * @initial_cmdsn: initial iscsi CMDSN
38  */
39 struct iscsi_cls_session *beiscsi_session_create(struct iscsi_endpoint *ep,
40 						 u16 cmds_max,
41 						 u16 qdepth,
42 						 u32 initial_cmdsn)
43 {
44 	struct Scsi_Host *shost;
45 	struct beiscsi_endpoint *beiscsi_ep;
46 	struct iscsi_cls_session *cls_session;
47 	struct beiscsi_hba *phba;
48 	struct iscsi_session *sess;
49 	struct beiscsi_session *beiscsi_sess;
50 	struct beiscsi_io_task *io_task;
51 
52 	SE_DEBUG(DBG_LVL_8, "In beiscsi_session_create\n");
53 
54 	if (!ep) {
55 		SE_DEBUG(DBG_LVL_1, "beiscsi_session_create: invalid ep \n");
56 		return NULL;
57 	}
58 	beiscsi_ep = ep->dd_data;
59 	phba = beiscsi_ep->phba;
60 	shost = phba->shost;
61 	if (cmds_max > beiscsi_ep->phba->params.wrbs_per_cxn) {
62 		shost_printk(KERN_ERR, shost, "Cannot handle %d cmds."
63 			     "Max cmds per session supported is %d. Using %d. "
64 			     "\n", cmds_max,
65 			      beiscsi_ep->phba->params.wrbs_per_cxn,
66 			      beiscsi_ep->phba->params.wrbs_per_cxn);
67 		cmds_max = beiscsi_ep->phba->params.wrbs_per_cxn;
68 	}
69 
70 	cls_session = iscsi_session_setup(&beiscsi_iscsi_transport,
71 					  shost, cmds_max,
72 					  sizeof(*beiscsi_sess),
73 					  sizeof(*io_task),
74 					  initial_cmdsn, ISCSI_MAX_TARGET);
75 	if (!cls_session)
76 		return NULL;
77 	sess = cls_session->dd_data;
78 	beiscsi_sess = sess->dd_data;
79 	beiscsi_sess->bhs_pool =  pci_pool_create("beiscsi_bhs_pool",
80 						   phba->pcidev,
81 						   sizeof(struct be_cmd_bhs),
82 						   64, 0);
83 	if (!beiscsi_sess->bhs_pool)
84 		goto destroy_sess;
85 
86 	return cls_session;
87 destroy_sess:
88 	iscsi_session_teardown(cls_session);
89 	return NULL;
90 }
91 
92 /**
93  * beiscsi_session_destroy - destroys iscsi session
94  * @cls_session:	pointer to iscsi cls session
95  *
96  * Destroys iSCSI session instance and releases
97  * resources allocated for it.
98  */
99 void beiscsi_session_destroy(struct iscsi_cls_session *cls_session)
100 {
101 	struct iscsi_session *sess = cls_session->dd_data;
102 	struct beiscsi_session *beiscsi_sess = sess->dd_data;
103 
104 	pci_pool_destroy(beiscsi_sess->bhs_pool);
105 	iscsi_session_teardown(cls_session);
106 }
107 
108 /**
109  * beiscsi_conn_create - create an instance of iscsi connection
110  * @cls_session: ptr to iscsi_cls_session
111  * @cid: iscsi cid
112  */
113 struct iscsi_cls_conn *
114 beiscsi_conn_create(struct iscsi_cls_session *cls_session, u32 cid)
115 {
116 	struct beiscsi_hba *phba;
117 	struct Scsi_Host *shost;
118 	struct iscsi_cls_conn *cls_conn;
119 	struct beiscsi_conn *beiscsi_conn;
120 	struct iscsi_conn *conn;
121 	struct iscsi_session *sess;
122 	struct beiscsi_session *beiscsi_sess;
123 
124 	SE_DEBUG(DBG_LVL_8, "In beiscsi_conn_create ,cid"
125 		 "from iscsi layer=%d\n", cid);
126 	shost = iscsi_session_to_shost(cls_session);
127 	phba = iscsi_host_priv(shost);
128 
129 	cls_conn = iscsi_conn_setup(cls_session, sizeof(*beiscsi_conn), cid);
130 	if (!cls_conn)
131 		return NULL;
132 
133 	conn = cls_conn->dd_data;
134 	beiscsi_conn = conn->dd_data;
135 	beiscsi_conn->ep = NULL;
136 	beiscsi_conn->phba = phba;
137 	beiscsi_conn->conn = conn;
138 	sess = cls_session->dd_data;
139 	beiscsi_sess = sess->dd_data;
140 	beiscsi_conn->beiscsi_sess = beiscsi_sess;
141 	return cls_conn;
142 }
143 
144 /**
145  * beiscsi_bindconn_cid - Bind the beiscsi_conn with phba connection table
146  * @beiscsi_conn: The pointer to  beiscsi_conn structure
147  * @phba: The phba instance
148  * @cid: The cid to free
149  */
150 static int beiscsi_bindconn_cid(struct beiscsi_hba *phba,
151 				struct beiscsi_conn *beiscsi_conn,
152 				unsigned int cid)
153 {
154 	if (phba->conn_table[cid]) {
155 		SE_DEBUG(DBG_LVL_1,
156 			 "Connection table already occupied. Detected clash\n");
157 		return -EINVAL;
158 	} else {
159 		SE_DEBUG(DBG_LVL_8, "phba->conn_table[%d]=%p(beiscsi_conn) \n",
160 			 cid, beiscsi_conn);
161 		phba->conn_table[cid] = beiscsi_conn;
162 	}
163 	return 0;
164 }
165 
166 /**
167  * beiscsi_conn_bind - Binds iscsi session/connection with TCP connection
168  * @cls_session: pointer to iscsi cls session
169  * @cls_conn: pointer to iscsi cls conn
170  * @transport_fd: EP handle(64 bit)
171  *
172  * This function binds the TCP Conn with iSCSI Connection and Session.
173  */
174 int beiscsi_conn_bind(struct iscsi_cls_session *cls_session,
175 		      struct iscsi_cls_conn *cls_conn,
176 		      u64 transport_fd, int is_leading)
177 {
178 	struct iscsi_conn *conn = cls_conn->dd_data;
179 	struct beiscsi_conn *beiscsi_conn = conn->dd_data;
180 	struct Scsi_Host *shost =
181 		(struct Scsi_Host *)iscsi_session_to_shost(cls_session);
182 	struct beiscsi_hba *phba = (struct beiscsi_hba *)iscsi_host_priv(shost);
183 	struct beiscsi_endpoint *beiscsi_ep;
184 	struct iscsi_endpoint *ep;
185 
186 	SE_DEBUG(DBG_LVL_8, "In beiscsi_conn_bind\n");
187 	ep = iscsi_lookup_endpoint(transport_fd);
188 	if (!ep)
189 		return -EINVAL;
190 
191 	beiscsi_ep = ep->dd_data;
192 
193 	if (iscsi_conn_bind(cls_session, cls_conn, is_leading))
194 		return -EINVAL;
195 
196 	if (beiscsi_ep->phba != phba) {
197 		SE_DEBUG(DBG_LVL_8,
198 			 "beiscsi_ep->hba=%p not equal to phba=%p \n",
199 			 beiscsi_ep->phba, phba);
200 		return -EEXIST;
201 	}
202 
203 	beiscsi_conn->beiscsi_conn_cid = beiscsi_ep->ep_cid;
204 	beiscsi_conn->ep = beiscsi_ep;
205 	beiscsi_ep->conn = beiscsi_conn;
206 	SE_DEBUG(DBG_LVL_8, "beiscsi_conn=%p conn=%p ep_cid=%d \n",
207 		 beiscsi_conn, conn, beiscsi_ep->ep_cid);
208 	return beiscsi_bindconn_cid(phba, beiscsi_conn, beiscsi_ep->ep_cid);
209 }
210 
211 /**
212  * beiscsi_conn_get_param - get the iscsi parameter
213  * @cls_conn: pointer to iscsi cls conn
214  * @param: parameter type identifier
215  * @buf: buffer pointer
216  *
217  * returns iscsi parameter
218  */
219 int beiscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
220 			   enum iscsi_param param, char *buf)
221 {
222 	struct beiscsi_endpoint *beiscsi_ep;
223 	struct iscsi_conn *conn = cls_conn->dd_data;
224 	struct beiscsi_conn *beiscsi_conn = conn->dd_data;
225 	int len = 0;
226 
227 	beiscsi_ep = beiscsi_conn->ep;
228 	if (!beiscsi_ep) {
229 		SE_DEBUG(DBG_LVL_1,
230 			 "In beiscsi_conn_get_param , no beiscsi_ep\n");
231 		return -1;
232 	}
233 
234 	switch (param) {
235 	case ISCSI_PARAM_CONN_PORT:
236 		len = sprintf(buf, "%hu\n", beiscsi_ep->dst_tcpport);
237 		break;
238 	case ISCSI_PARAM_CONN_ADDRESS:
239 		if (beiscsi_ep->ip_type == BE2_IPV4)
240 			len = sprintf(buf, "%pI4\n", &beiscsi_ep->dst_addr);
241 		else
242 			len = sprintf(buf, "%pI6\n", &beiscsi_ep->dst6_addr);
243 		break;
244 	default:
245 		return iscsi_conn_get_param(cls_conn, param, buf);
246 	}
247 	return len;
248 }
249 
250 int beiscsi_set_param(struct iscsi_cls_conn *cls_conn,
251 		      enum iscsi_param param, char *buf, int buflen)
252 {
253 	struct iscsi_conn *conn = cls_conn->dd_data;
254 	struct iscsi_session *session = conn->session;
255 	int ret;
256 
257 	ret = iscsi_set_param(cls_conn, param, buf, buflen);
258 	if (ret)
259 		return ret;
260 	/*
261 	 * If userspace tried to set the value to higher than we can
262 	 * support override here.
263 	 */
264 	switch (param) {
265 	case ISCSI_PARAM_FIRST_BURST:
266 		if (session->first_burst > 8192)
267 			session->first_burst = 8192;
268 		break;
269 	case ISCSI_PARAM_MAX_RECV_DLENGTH:
270 		if (conn->max_recv_dlength > 65536)
271 			conn->max_recv_dlength = 65536;
272 		break;
273 	case ISCSI_PARAM_MAX_BURST:
274 		if (session->first_burst > 262144)
275 			session->first_burst = 262144;
276 		break;
277 	default:
278 		return 0;
279 	}
280 
281 	return 0;
282 }
283 
284 /**
285  * beiscsi_get_host_param - get the iscsi parameter
286  * @shost: pointer to scsi_host structure
287  * @param: parameter type identifier
288  * @buf: buffer pointer
289  *
290  * returns host parameter
291  */
292 int beiscsi_get_host_param(struct Scsi_Host *shost,
293 			   enum iscsi_host_param param, char *buf)
294 {
295 	struct beiscsi_hba *phba = (struct beiscsi_hba *)iscsi_host_priv(shost);
296 	int len = 0;
297 
298 	switch (param) {
299 	case ISCSI_HOST_PARAM_HWADDRESS:
300 		be_cmd_get_mac_addr(phba, phba->mac_address);
301 		len = sysfs_format_mac(buf, phba->mac_address, ETH_ALEN);
302 		break;
303 	default:
304 		return iscsi_host_get_param(shost, param, buf);
305 	}
306 	return len;
307 }
308 
309 /**
310  * beiscsi_conn_get_stats - get the iscsi stats
311  * @cls_conn: pointer to iscsi cls conn
312  * @stats: pointer to iscsi_stats structure
313  *
314  * returns iscsi stats
315  */
316 void beiscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn,
317 			    struct iscsi_stats *stats)
318 {
319 	struct iscsi_conn *conn = cls_conn->dd_data;
320 
321 	SE_DEBUG(DBG_LVL_8, "In beiscsi_conn_get_stats\n");
322 	stats->txdata_octets = conn->txdata_octets;
323 	stats->rxdata_octets = conn->rxdata_octets;
324 	stats->dataout_pdus = conn->dataout_pdus_cnt;
325 	stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
326 	stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
327 	stats->datain_pdus = conn->datain_pdus_cnt;
328 	stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
329 	stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
330 	stats->r2t_pdus = conn->r2t_pdus_cnt;
331 	stats->digest_err = 0;
332 	stats->timeout_err = 0;
333 	stats->custom_length = 0;
334 	strcpy(stats->custom[0].desc, "eh_abort_cnt");
335 	stats->custom[0].value = conn->eh_abort_cnt;
336 }
337 
338 /**
339  * beiscsi_set_params_for_offld - get the parameters for offload
340  * @beiscsi_conn: pointer to beiscsi_conn
341  * @params: pointer to offload_params structure
342  */
343 static void  beiscsi_set_params_for_offld(struct beiscsi_conn *beiscsi_conn,
344 					  struct beiscsi_offload_params *params)
345 {
346 	struct iscsi_conn *conn = beiscsi_conn->conn;
347 	struct iscsi_session *session = conn->session;
348 
349 	AMAP_SET_BITS(struct amap_beiscsi_offload_params, max_burst_length,
350 		      params, session->max_burst);
351 	AMAP_SET_BITS(struct amap_beiscsi_offload_params,
352 		      max_send_data_segment_length, params,
353 		      conn->max_xmit_dlength);
354 	AMAP_SET_BITS(struct amap_beiscsi_offload_params, first_burst_length,
355 		      params, session->first_burst);
356 	AMAP_SET_BITS(struct amap_beiscsi_offload_params, erl, params,
357 		      session->erl);
358 	AMAP_SET_BITS(struct amap_beiscsi_offload_params, dde, params,
359 		      conn->datadgst_en);
360 	AMAP_SET_BITS(struct amap_beiscsi_offload_params, hde, params,
361 		      conn->hdrdgst_en);
362 	AMAP_SET_BITS(struct amap_beiscsi_offload_params, ir2t, params,
363 		      session->initial_r2t_en);
364 	AMAP_SET_BITS(struct amap_beiscsi_offload_params, imd, params,
365 		      session->imm_data_en);
366 	AMAP_SET_BITS(struct amap_beiscsi_offload_params, exp_statsn, params,
367 		      (conn->exp_statsn - 1));
368 }
369 
370 /**
371  * beiscsi_conn_start - offload of session to chip
372  * @cls_conn: pointer to beiscsi_conn
373  */
374 int beiscsi_conn_start(struct iscsi_cls_conn *cls_conn)
375 {
376 	struct iscsi_conn *conn = cls_conn->dd_data;
377 	struct beiscsi_conn *beiscsi_conn = conn->dd_data;
378 	struct beiscsi_endpoint *beiscsi_ep;
379 	struct beiscsi_offload_params params;
380 
381 	memset(&params, 0, sizeof(struct beiscsi_offload_params));
382 	beiscsi_ep = beiscsi_conn->ep;
383 	if (!beiscsi_ep)
384 		SE_DEBUG(DBG_LVL_1, "In beiscsi_conn_start , no beiscsi_ep\n");
385 
386 	beiscsi_conn->login_in_progress = 0;
387 	beiscsi_set_params_for_offld(beiscsi_conn, &params);
388 	beiscsi_offload_connection(beiscsi_conn, &params);
389 	iscsi_conn_start(cls_conn);
390 	return 0;
391 }
392 
393 /**
394  * beiscsi_get_cid - Allocate a cid
395  * @phba: The phba instance
396  */
397 static int beiscsi_get_cid(struct beiscsi_hba *phba)
398 {
399 	unsigned short cid = 0xFFFF;
400 
401 	if (!phba->avlbl_cids)
402 		return cid;
403 
404 	cid = phba->cid_array[phba->cid_alloc++];
405 	if (phba->cid_alloc == phba->params.cxns_per_ctrl)
406 		phba->cid_alloc = 0;
407 	phba->avlbl_cids--;
408 	return cid;
409 }
410 
411 /**
412  * beiscsi_open_conn - Ask FW to open a TCP connection
413  * @ep:	endpoint to be used
414  * @src_addr: The source IP address
415  * @dst_addr: The Destination  IP address
416  *
417  * Asks the FW to open a TCP connection
418  */
419 static int beiscsi_open_conn(struct iscsi_endpoint *ep,
420 			     struct sockaddr *src_addr,
421 			     struct sockaddr *dst_addr, int non_blocking)
422 {
423 	struct beiscsi_endpoint *beiscsi_ep = ep->dd_data;
424 	struct beiscsi_hba *phba = beiscsi_ep->phba;
425 	int ret = -1;
426 
427 	beiscsi_ep->ep_cid = beiscsi_get_cid(phba);
428 	if (beiscsi_ep->ep_cid == 0xFFFF) {
429 		SE_DEBUG(DBG_LVL_1, "No free cid available\n");
430 		return ret;
431 	}
432 	SE_DEBUG(DBG_LVL_8, "In beiscsi_open_conn, ep_cid=%d ",
433 		 beiscsi_ep->ep_cid);
434 	phba->ep_array[beiscsi_ep->ep_cid] = ep;
435 	if (beiscsi_ep->ep_cid >
436 	    (phba->fw_config.iscsi_cid_start + phba->params.cxns_per_ctrl)) {
437 		SE_DEBUG(DBG_LVL_1, "Failed in allocate iscsi cid\n");
438 		return ret;
439 	}
440 
441 	beiscsi_ep->cid_vld = 0;
442 	return mgmt_open_connection(phba, dst_addr, beiscsi_ep);
443 }
444 
445 /**
446  * beiscsi_put_cid - Free the cid
447  * @phba: The phba for which the cid is being freed
448  * @cid: The cid to free
449  */
450 static void beiscsi_put_cid(struct beiscsi_hba *phba, unsigned short cid)
451 {
452 	phba->avlbl_cids++;
453 	phba->cid_array[phba->cid_free++] = cid;
454 	if (phba->cid_free == phba->params.cxns_per_ctrl)
455 		phba->cid_free = 0;
456 }
457 
458 /**
459  * beiscsi_free_ep - free endpoint
460  * @ep:	pointer to iscsi endpoint structure
461  */
462 static void beiscsi_free_ep(struct iscsi_endpoint *ep)
463 {
464 	struct beiscsi_endpoint *beiscsi_ep = ep->dd_data;
465 	struct beiscsi_hba *phba = beiscsi_ep->phba;
466 
467 	beiscsi_put_cid(phba, beiscsi_ep->ep_cid);
468 	beiscsi_ep->phba = NULL;
469 	iscsi_destroy_endpoint(ep);
470 }
471 
472 /**
473  * beiscsi_ep_connect - Ask chip to create TCP Conn
474  * @scsi_host: Pointer to scsi_host structure
475  * @dst_addr: The IP address of Target
476  * @non_blocking: blocking or non-blocking call
477  *
478  * This routines first asks chip to create a connection and then allocates an EP
479  */
480 struct iscsi_endpoint *
481 beiscsi_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr,
482 		   int non_blocking)
483 {
484 	struct beiscsi_hba *phba;
485 	struct beiscsi_endpoint *beiscsi_ep;
486 	struct iscsi_endpoint *ep;
487 	int ret;
488 
489 	SE_DEBUG(DBG_LVL_8, "In beiscsi_ep_connect \n");
490 	if (shost)
491 		phba = iscsi_host_priv(shost);
492 	else {
493 		ret = -ENXIO;
494 		SE_DEBUG(DBG_LVL_1, "shost is NULL \n");
495 		return ERR_PTR(ret);
496 	}
497 
498 	if (phba->state) {
499 		ret = -EBUSY;
500 		SE_DEBUG(DBG_LVL_1, "The Adapet state is Not UP \n");
501 		return ERR_PTR(ret);
502 	}
503 
504 	ep = iscsi_create_endpoint(sizeof(struct beiscsi_endpoint));
505 	if (!ep) {
506 		ret = -ENOMEM;
507 		return ERR_PTR(ret);
508 	}
509 
510 	beiscsi_ep = ep->dd_data;
511 	beiscsi_ep->phba = phba;
512 
513 	if (beiscsi_open_conn(ep, NULL, dst_addr, non_blocking)) {
514 		SE_DEBUG(DBG_LVL_1, "Failed in allocate iscsi cid\n");
515 		ret = -ENOMEM;
516 		goto free_ep;
517 	}
518 
519 	return ep;
520 
521 free_ep:
522 	beiscsi_free_ep(ep);
523 	return ERR_PTR(ret);
524 }
525 
526 /**
527  * beiscsi_ep_poll - Poll to see if connection is established
528  * @ep:	endpoint to be used
529  * @timeout_ms: timeout specified in millisecs
530  *
531  * Poll to see if TCP connection established
532  */
533 int beiscsi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
534 {
535 	struct beiscsi_endpoint *beiscsi_ep = ep->dd_data;
536 
537 	SE_DEBUG(DBG_LVL_8, "In  beiscsi_ep_poll\n");
538 	if (beiscsi_ep->cid_vld == 1)
539 		return 1;
540 	else
541 		return 0;
542 }
543 
544 /**
545  * beiscsi_close_conn - Upload the  connection
546  * @ep: The iscsi endpoint
547  * @flag: The type of connection closure
548  */
549 static int beiscsi_close_conn(struct iscsi_endpoint *ep, int flag)
550 {
551 	int ret = 0;
552 	struct beiscsi_endpoint *beiscsi_ep = ep->dd_data;
553 	struct beiscsi_hba *phba = beiscsi_ep->phba;
554 
555 	if (MGMT_STATUS_SUCCESS !=
556 	    mgmt_upload_connection(phba, beiscsi_ep->ep_cid,
557 		CONNECTION_UPLOAD_GRACEFUL)) {
558 		SE_DEBUG(DBG_LVL_8, "upload failed for cid 0x%x",
559 			 beiscsi_ep->ep_cid);
560 		ret = -1;
561 	}
562 
563 	return ret;
564 }
565 
566 /**
567  * beiscsi_ep_disconnect - Tears down the TCP connection
568  * @ep:	endpoint to be used
569  *
570  * Tears down the TCP connection
571  */
572 void beiscsi_ep_disconnect(struct iscsi_endpoint *ep)
573 {
574 	struct beiscsi_conn *beiscsi_conn;
575 	struct beiscsi_endpoint *beiscsi_ep;
576 	struct beiscsi_hba *phba;
577 	int flag = 0;
578 
579 	beiscsi_ep = ep->dd_data;
580 	phba = beiscsi_ep->phba;
581 	SE_DEBUG(DBG_LVL_8, "In beiscsi_ep_disconnect\n");
582 
583 	if (beiscsi_ep->conn) {
584 		beiscsi_conn = beiscsi_ep->conn;
585 		iscsi_suspend_queue(beiscsi_conn->conn);
586 		beiscsi_close_conn(ep, flag);
587 	}
588 
589 	beiscsi_free_ep(ep);
590 }
591 
592 /**
593  * beiscsi_unbind_conn_to_cid - Unbind the beiscsi_conn from phba conn table
594  * @phba: The phba instance
595  * @cid: The cid to free
596  */
597 static int beiscsi_unbind_conn_to_cid(struct beiscsi_hba *phba,
598 				      unsigned int cid)
599 {
600 	if (phba->conn_table[cid])
601 		phba->conn_table[cid] = NULL;
602 	else {
603 		SE_DEBUG(DBG_LVL_8, "Connection table Not occupied. \n");
604 		return -EINVAL;
605 	}
606 	return 0;
607 }
608 
609 /**
610  * beiscsi_conn_stop - Invalidate and stop the connection
611  * @cls_conn: pointer to get iscsi_conn
612  * @flag: The type of connection closure
613  */
614 void beiscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
615 {
616 	struct iscsi_conn *conn = cls_conn->dd_data;
617 	struct beiscsi_conn *beiscsi_conn = conn->dd_data;
618 	struct beiscsi_endpoint *beiscsi_ep;
619 	struct iscsi_session *session = conn->session;
620 	struct Scsi_Host *shost = iscsi_session_to_shost(session->cls_session);
621 	struct beiscsi_hba *phba = iscsi_host_priv(shost);
622 	unsigned int status;
623 	unsigned short savecfg_flag = CMD_ISCSI_SESSION_SAVE_CFG_ON_FLASH;
624 
625 	SE_DEBUG(DBG_LVL_8, "In beiscsi_conn_stop\n");
626 	beiscsi_ep = beiscsi_conn->ep;
627 	if (!beiscsi_ep) {
628 		SE_DEBUG(DBG_LVL_8, "In beiscsi_conn_stop , no beiscsi_ep\n");
629 		return;
630 	}
631 	status = mgmt_invalidate_connection(phba, beiscsi_ep,
632 					    beiscsi_ep->ep_cid, 1,
633 					    savecfg_flag);
634 	if (status != MGMT_STATUS_SUCCESS) {
635 		SE_DEBUG(DBG_LVL_1,
636 			 "mgmt_invalidate_connection Failed for cid=%d \n",
637 			 beiscsi_ep->ep_cid);
638 	}
639 	beiscsi_unbind_conn_to_cid(phba, beiscsi_ep->ep_cid);
640 	iscsi_conn_stop(cls_conn, flag);
641 }
642