1 /*
2  * bnx2i_iscsi.c: QLogic NetXtreme II iSCSI driver.
3  *
4  * Copyright (c) 2006 - 2013 Broadcom Corporation
5  * Copyright (c) 2007, 2008 Red Hat, Inc.  All rights reserved.
6  * Copyright (c) 2007, 2008 Mike Christie
7  * Copyright (c) 2014, QLogic Corporation
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation.
12  *
13  * Written by: Anil Veerabhadrappa (anilgv@broadcom.com)
14  * Previously Maintained by: Eddie Wai (eddie.wai@broadcom.com)
15  * Maintained by: QLogic-Storage-Upstream@qlogic.com
16  */
17 
18 #include <linux/slab.h>
19 #include <scsi/scsi_tcq.h>
20 #include <scsi/libiscsi.h>
21 #include "bnx2i.h"
22 
23 struct scsi_transport_template *bnx2i_scsi_xport_template;
24 struct iscsi_transport bnx2i_iscsi_transport;
25 static const struct scsi_host_template bnx2i_host_template;
26 
27 /*
28  * Global endpoint resource info
29  */
30 static DEFINE_SPINLOCK(bnx2i_resc_lock); /* protects global resources */
31 
32 DECLARE_PER_CPU(struct bnx2i_percpu_s, bnx2i_percpu);
33 
bnx2i_adapter_ready(struct bnx2i_hba * hba)34 static int bnx2i_adapter_ready(struct bnx2i_hba *hba)
35 {
36 	int retval = 0;
37 
38 	if (!hba || !test_bit(ADAPTER_STATE_UP, &hba->adapter_state) ||
39 	    test_bit(ADAPTER_STATE_GOING_DOWN, &hba->adapter_state) ||
40 	    test_bit(ADAPTER_STATE_LINK_DOWN, &hba->adapter_state))
41 		retval = -EPERM;
42 	return retval;
43 }
44 
45 /**
46  * bnx2i_get_write_cmd_bd_idx - identifies various BD bookmarks
47  * @cmd:		iscsi cmd struct pointer
48  * @buf_off:		absolute buffer offset
49  * @start_bd_off:	u32 pointer to return the offset within the BD
50  *			indicated by 'start_bd_idx' on which 'buf_off' falls
51  * @start_bd_idx:	index of the BD on which 'buf_off' falls
52  *
53  * identifies & marks various bd info for scsi command's imm data,
54  * unsolicited data and the first solicited data seq.
55  */
bnx2i_get_write_cmd_bd_idx(struct bnx2i_cmd * cmd,u32 buf_off,u32 * start_bd_off,u32 * start_bd_idx)56 static void bnx2i_get_write_cmd_bd_idx(struct bnx2i_cmd *cmd, u32 buf_off,
57 				       u32 *start_bd_off, u32 *start_bd_idx)
58 {
59 	struct iscsi_bd *bd_tbl = cmd->io_tbl.bd_tbl;
60 	u32 cur_offset = 0;
61 	u32 cur_bd_idx = 0;
62 
63 	if (buf_off) {
64 		while (buf_off >= (cur_offset + bd_tbl->buffer_length)) {
65 			cur_offset += bd_tbl->buffer_length;
66 			cur_bd_idx++;
67 			bd_tbl++;
68 		}
69 	}
70 
71 	*start_bd_off = buf_off - cur_offset;
72 	*start_bd_idx = cur_bd_idx;
73 }
74 
75 /**
76  * bnx2i_setup_write_cmd_bd_info - sets up BD various information
77  * @task:	transport layer's cmd struct pointer
78  *
79  * identifies & marks various bd info for scsi command's immediate data,
80  * unsolicited data and first solicited data seq which includes BD start
81  * index & BD buf off. his function takes into account iscsi parameter such
82  * as immediate data and unsolicited data is support on this connection.
83  */
bnx2i_setup_write_cmd_bd_info(struct iscsi_task * task)84 static void bnx2i_setup_write_cmd_bd_info(struct iscsi_task *task)
85 {
86 	struct bnx2i_cmd *cmd = task->dd_data;
87 	u32 start_bd_offset;
88 	u32 start_bd_idx;
89 	u32 buffer_offset = 0;
90 	u32 cmd_len = cmd->req.total_data_transfer_length;
91 
92 	/* if ImmediateData is turned off & IntialR2T is turned on,
93 	 * there will be no immediate or unsolicited data, just return.
94 	 */
95 	if (!iscsi_task_has_unsol_data(task) && !task->imm_count)
96 		return;
97 
98 	/* Immediate data */
99 	buffer_offset += task->imm_count;
100 	if (task->imm_count == cmd_len)
101 		return;
102 
103 	if (iscsi_task_has_unsol_data(task)) {
104 		bnx2i_get_write_cmd_bd_idx(cmd, buffer_offset,
105 					   &start_bd_offset, &start_bd_idx);
106 		cmd->req.ud_buffer_offset = start_bd_offset;
107 		cmd->req.ud_start_bd_index = start_bd_idx;
108 		buffer_offset += task->unsol_r2t.data_length;
109 	}
110 
111 	if (buffer_offset != cmd_len) {
112 		bnx2i_get_write_cmd_bd_idx(cmd, buffer_offset,
113 					   &start_bd_offset, &start_bd_idx);
114 		if ((start_bd_offset > task->conn->session->first_burst) ||
115 		    (start_bd_idx > scsi_sg_count(cmd->scsi_cmd))) {
116 			int i = 0;
117 
118 			iscsi_conn_printk(KERN_ALERT, task->conn,
119 					  "bnx2i- error, buf offset 0x%x "
120 					  "bd_valid %d use_sg %d\n",
121 					  buffer_offset, cmd->io_tbl.bd_valid,
122 					  scsi_sg_count(cmd->scsi_cmd));
123 			for (i = 0; i < cmd->io_tbl.bd_valid; i++)
124 				iscsi_conn_printk(KERN_ALERT, task->conn,
125 						  "bnx2i err, bd[%d]: len %x\n",
126 						  i, cmd->io_tbl.bd_tbl[i].\
127 						  buffer_length);
128 		}
129 		cmd->req.sd_buffer_offset = start_bd_offset;
130 		cmd->req.sd_start_bd_index = start_bd_idx;
131 	}
132 }
133 
134 
135 
136 /**
137  * bnx2i_map_scsi_sg - maps IO buffer and prepares the BD table
138  * @hba:	adapter instance
139  * @cmd:	iscsi cmd struct pointer
140  *
141  * map SG list
142  */
bnx2i_map_scsi_sg(struct bnx2i_hba * hba,struct bnx2i_cmd * cmd)143 static int bnx2i_map_scsi_sg(struct bnx2i_hba *hba, struct bnx2i_cmd *cmd)
144 {
145 	struct scsi_cmnd *sc = cmd->scsi_cmd;
146 	struct iscsi_bd *bd = cmd->io_tbl.bd_tbl;
147 	struct scatterlist *sg;
148 	int byte_count = 0;
149 	int bd_count = 0;
150 	int sg_count;
151 	int sg_len;
152 	u64 addr;
153 	int i;
154 
155 	BUG_ON(scsi_sg_count(sc) > ISCSI_MAX_BDS_PER_CMD);
156 
157 	sg_count = scsi_dma_map(sc);
158 
159 	scsi_for_each_sg(sc, sg, sg_count, i) {
160 		sg_len = sg_dma_len(sg);
161 		addr = (u64) sg_dma_address(sg);
162 		bd[bd_count].buffer_addr_lo = addr & 0xffffffff;
163 		bd[bd_count].buffer_addr_hi = addr >> 32;
164 		bd[bd_count].buffer_length = sg_len;
165 		bd[bd_count].flags = 0;
166 		if (bd_count == 0)
167 			bd[bd_count].flags = ISCSI_BD_FIRST_IN_BD_CHAIN;
168 
169 		byte_count += sg_len;
170 		bd_count++;
171 	}
172 
173 	if (bd_count)
174 		bd[bd_count - 1].flags |= ISCSI_BD_LAST_IN_BD_CHAIN;
175 
176 	BUG_ON(byte_count != scsi_bufflen(sc));
177 	return bd_count;
178 }
179 
180 /**
181  * bnx2i_iscsi_map_sg_list - maps SG list
182  * @cmd:	iscsi cmd struct pointer
183  *
184  * creates BD list table for the command
185  */
bnx2i_iscsi_map_sg_list(struct bnx2i_cmd * cmd)186 static void bnx2i_iscsi_map_sg_list(struct bnx2i_cmd *cmd)
187 {
188 	int bd_count;
189 
190 	bd_count  = bnx2i_map_scsi_sg(cmd->conn->hba, cmd);
191 	if (!bd_count) {
192 		struct iscsi_bd *bd = cmd->io_tbl.bd_tbl;
193 
194 		bd[0].buffer_addr_lo = bd[0].buffer_addr_hi = 0;
195 		bd[0].buffer_length = bd[0].flags = 0;
196 	}
197 	cmd->io_tbl.bd_valid = bd_count;
198 }
199 
200 
201 /**
202  * bnx2i_iscsi_unmap_sg_list - unmaps SG list
203  * @cmd:	iscsi cmd struct pointer
204  *
205  * unmap IO buffers and invalidate the BD table
206  */
bnx2i_iscsi_unmap_sg_list(struct bnx2i_cmd * cmd)207 void bnx2i_iscsi_unmap_sg_list(struct bnx2i_cmd *cmd)
208 {
209 	struct scsi_cmnd *sc = cmd->scsi_cmd;
210 
211 	if (cmd->io_tbl.bd_valid && sc) {
212 		scsi_dma_unmap(sc);
213 		cmd->io_tbl.bd_valid = 0;
214 	}
215 }
216 
bnx2i_setup_cmd_wqe_template(struct bnx2i_cmd * cmd)217 static void bnx2i_setup_cmd_wqe_template(struct bnx2i_cmd *cmd)
218 {
219 	memset(&cmd->req, 0x00, sizeof(cmd->req));
220 	cmd->req.op_code = 0xFF;
221 	cmd->req.bd_list_addr_lo = (u32) cmd->io_tbl.bd_tbl_dma;
222 	cmd->req.bd_list_addr_hi =
223 		(u32) ((u64) cmd->io_tbl.bd_tbl_dma >> 32);
224 
225 }
226 
227 
228 /**
229  * bnx2i_bind_conn_to_iscsi_cid - bind conn structure to 'iscsi_cid'
230  * @hba:	pointer to adapter instance
231  * @bnx2i_conn:	pointer to iscsi connection
232  * @iscsi_cid:	iscsi context ID, range 0 - (MAX_CONN - 1)
233  *
234  * update iscsi cid table entry with connection pointer. This enables
235  *	driver to quickly get hold of connection structure pointer in
236  *	completion/interrupt thread using iscsi context ID
237  */
bnx2i_bind_conn_to_iscsi_cid(struct bnx2i_hba * hba,struct bnx2i_conn * bnx2i_conn,u32 iscsi_cid)238 static int bnx2i_bind_conn_to_iscsi_cid(struct bnx2i_hba *hba,
239 					struct bnx2i_conn *bnx2i_conn,
240 					u32 iscsi_cid)
241 {
242 	if (hba && hba->cid_que.conn_cid_tbl[iscsi_cid]) {
243 		iscsi_conn_printk(KERN_ALERT, bnx2i_conn->cls_conn->dd_data,
244 				 "conn bind - entry #%d not free\n", iscsi_cid);
245 		return -EBUSY;
246 	}
247 
248 	hba->cid_que.conn_cid_tbl[iscsi_cid] = bnx2i_conn;
249 	return 0;
250 }
251 
252 
253 /**
254  * bnx2i_get_conn_from_id - maps an iscsi cid to corresponding conn ptr
255  * @hba:	pointer to adapter instance
256  * @iscsi_cid:	iscsi context ID, range 0 - (MAX_CONN - 1)
257  */
bnx2i_get_conn_from_id(struct bnx2i_hba * hba,u16 iscsi_cid)258 struct bnx2i_conn *bnx2i_get_conn_from_id(struct bnx2i_hba *hba,
259 					  u16 iscsi_cid)
260 {
261 	if (!hba->cid_que.conn_cid_tbl) {
262 		printk(KERN_ERR "bnx2i: ERROR - missing conn<->cid table\n");
263 		return NULL;
264 
265 	} else if (iscsi_cid >= hba->max_active_conns) {
266 		printk(KERN_ERR "bnx2i: wrong cid #%d\n", iscsi_cid);
267 		return NULL;
268 	}
269 	return hba->cid_que.conn_cid_tbl[iscsi_cid];
270 }
271 
272 
273 /**
274  * bnx2i_alloc_iscsi_cid - allocates a iscsi_cid from free pool
275  * @hba:	pointer to adapter instance
276  */
bnx2i_alloc_iscsi_cid(struct bnx2i_hba * hba)277 static u32 bnx2i_alloc_iscsi_cid(struct bnx2i_hba *hba)
278 {
279 	int idx;
280 
281 	if (!hba->cid_que.cid_free_cnt)
282 		return -1;
283 
284 	idx = hba->cid_que.cid_q_cons_idx;
285 	hba->cid_que.cid_q_cons_idx++;
286 	if (hba->cid_que.cid_q_cons_idx == hba->cid_que.cid_q_max_idx)
287 		hba->cid_que.cid_q_cons_idx = 0;
288 
289 	hba->cid_que.cid_free_cnt--;
290 	return hba->cid_que.cid_que[idx];
291 }
292 
293 
294 /**
295  * bnx2i_free_iscsi_cid - returns tcp port to free list
296  * @hba: 		pointer to adapter instance
297  * @iscsi_cid:		iscsi context ID to free
298  */
bnx2i_free_iscsi_cid(struct bnx2i_hba * hba,u16 iscsi_cid)299 static void bnx2i_free_iscsi_cid(struct bnx2i_hba *hba, u16 iscsi_cid)
300 {
301 	int idx;
302 
303 	if (iscsi_cid == (u16) -1)
304 		return;
305 
306 	hba->cid_que.cid_free_cnt++;
307 
308 	idx = hba->cid_que.cid_q_prod_idx;
309 	hba->cid_que.cid_que[idx] = iscsi_cid;
310 	hba->cid_que.conn_cid_tbl[iscsi_cid] = NULL;
311 	hba->cid_que.cid_q_prod_idx++;
312 	if (hba->cid_que.cid_q_prod_idx == hba->cid_que.cid_q_max_idx)
313 		hba->cid_que.cid_q_prod_idx = 0;
314 }
315 
316 
317 /**
318  * bnx2i_setup_free_cid_que - sets up free iscsi cid queue
319  * @hba:	pointer to adapter instance
320  *
321  * allocates memory for iscsi cid queue & 'cid - conn ptr' mapping table,
322  * 	and initialize table attributes
323  */
bnx2i_setup_free_cid_que(struct bnx2i_hba * hba)324 static int bnx2i_setup_free_cid_que(struct bnx2i_hba *hba)
325 {
326 	int mem_size;
327 	int i;
328 
329 	mem_size = hba->max_active_conns * sizeof(u32);
330 	mem_size = (mem_size + (PAGE_SIZE - 1)) & PAGE_MASK;
331 
332 	hba->cid_que.cid_que_base = kmalloc(mem_size, GFP_KERNEL);
333 	if (!hba->cid_que.cid_que_base)
334 		return -ENOMEM;
335 
336 	mem_size = hba->max_active_conns * sizeof(struct bnx2i_conn *);
337 	mem_size = (mem_size + (PAGE_SIZE - 1)) & PAGE_MASK;
338 	hba->cid_que.conn_cid_tbl = kmalloc(mem_size, GFP_KERNEL);
339 	if (!hba->cid_que.conn_cid_tbl) {
340 		kfree(hba->cid_que.cid_que_base);
341 		hba->cid_que.cid_que_base = NULL;
342 		return -ENOMEM;
343 	}
344 
345 	hba->cid_que.cid_que = (u32 *)hba->cid_que.cid_que_base;
346 	hba->cid_que.cid_q_prod_idx = 0;
347 	hba->cid_que.cid_q_cons_idx = 0;
348 	hba->cid_que.cid_q_max_idx = hba->max_active_conns;
349 	hba->cid_que.cid_free_cnt = hba->max_active_conns;
350 
351 	for (i = 0; i < hba->max_active_conns; i++) {
352 		hba->cid_que.cid_que[i] = i;
353 		hba->cid_que.conn_cid_tbl[i] = NULL;
354 	}
355 	return 0;
356 }
357 
358 
359 /**
360  * bnx2i_release_free_cid_que - releases 'iscsi_cid' queue resources
361  * @hba:	pointer to adapter instance
362  */
bnx2i_release_free_cid_que(struct bnx2i_hba * hba)363 static void bnx2i_release_free_cid_que(struct bnx2i_hba *hba)
364 {
365 	kfree(hba->cid_que.cid_que_base);
366 	hba->cid_que.cid_que_base = NULL;
367 
368 	kfree(hba->cid_que.conn_cid_tbl);
369 	hba->cid_que.conn_cid_tbl = NULL;
370 }
371 
372 
373 /**
374  * bnx2i_alloc_ep - allocates ep structure from global pool
375  * @hba:	pointer to adapter instance
376  *
377  * routine allocates a free endpoint structure from global pool and
378  *	a tcp port to be used for this connection.  Global resource lock,
379  *	'bnx2i_resc_lock' is held while accessing shared global data structures
380  */
bnx2i_alloc_ep(struct bnx2i_hba * hba)381 static struct iscsi_endpoint *bnx2i_alloc_ep(struct bnx2i_hba *hba)
382 {
383 	struct iscsi_endpoint *ep;
384 	struct bnx2i_endpoint *bnx2i_ep;
385 	u32 ec_div;
386 
387 	ep = iscsi_create_endpoint(sizeof(*bnx2i_ep));
388 	if (!ep) {
389 		printk(KERN_ERR "bnx2i: Could not allocate ep\n");
390 		return NULL;
391 	}
392 
393 	bnx2i_ep = ep->dd_data;
394 	bnx2i_ep->cls_ep = ep;
395 	INIT_LIST_HEAD(&bnx2i_ep->link);
396 	bnx2i_ep->state = EP_STATE_IDLE;
397 	bnx2i_ep->ep_iscsi_cid = (u16) -1;
398 	bnx2i_ep->hba = hba;
399 	bnx2i_ep->hba_age = hba->age;
400 
401 	ec_div = event_coal_div;
402 	while (ec_div >>= 1)
403 		bnx2i_ep->ec_shift += 1;
404 
405 	hba->ofld_conns_active++;
406 	init_waitqueue_head(&bnx2i_ep->ofld_wait);
407 	return ep;
408 }
409 
410 
411 /**
412  * bnx2i_free_ep - free endpoint
413  * @ep:		pointer to iscsi endpoint structure
414  */
bnx2i_free_ep(struct iscsi_endpoint * ep)415 static void bnx2i_free_ep(struct iscsi_endpoint *ep)
416 {
417 	struct bnx2i_endpoint *bnx2i_ep = ep->dd_data;
418 	unsigned long flags;
419 
420 	spin_lock_irqsave(&bnx2i_resc_lock, flags);
421 	bnx2i_ep->state = EP_STATE_IDLE;
422 	bnx2i_ep->hba->ofld_conns_active--;
423 
424 	if (bnx2i_ep->ep_iscsi_cid != (u16) -1)
425 		bnx2i_free_iscsi_cid(bnx2i_ep->hba, bnx2i_ep->ep_iscsi_cid);
426 
427 	if (bnx2i_ep->conn) {
428 		bnx2i_ep->conn->ep = NULL;
429 		bnx2i_ep->conn = NULL;
430 	}
431 
432 	bnx2i_ep->hba = NULL;
433 	spin_unlock_irqrestore(&bnx2i_resc_lock, flags);
434 	iscsi_destroy_endpoint(ep);
435 }
436 
437 
438 /**
439  * bnx2i_alloc_bdt - allocates buffer descriptor (BD) table for the command
440  * @hba:	adapter instance pointer
441  * @session:	iscsi session pointer
442  * @cmd:	iscsi command structure
443  */
bnx2i_alloc_bdt(struct bnx2i_hba * hba,struct iscsi_session * session,struct bnx2i_cmd * cmd)444 static int bnx2i_alloc_bdt(struct bnx2i_hba *hba, struct iscsi_session *session,
445 			   struct bnx2i_cmd *cmd)
446 {
447 	struct io_bdt *io = &cmd->io_tbl;
448 	struct iscsi_bd *bd;
449 
450 	io->bd_tbl = dma_alloc_coherent(&hba->pcidev->dev,
451 					ISCSI_MAX_BDS_PER_CMD * sizeof(*bd),
452 					&io->bd_tbl_dma, GFP_KERNEL);
453 	if (!io->bd_tbl) {
454 		iscsi_session_printk(KERN_ERR, session, "Could not "
455 				     "allocate bdt.\n");
456 		return -ENOMEM;
457 	}
458 	io->bd_valid = 0;
459 	return 0;
460 }
461 
462 /**
463  * bnx2i_destroy_cmd_pool - destroys iscsi command pool and release BD table
464  * @hba:	adapter instance pointer
465  * @session:	iscsi session pointer
466  */
bnx2i_destroy_cmd_pool(struct bnx2i_hba * hba,struct iscsi_session * session)467 static void bnx2i_destroy_cmd_pool(struct bnx2i_hba *hba,
468 				   struct iscsi_session *session)
469 {
470 	int i;
471 
472 	for (i = 0; i < session->cmds_max; i++) {
473 		struct iscsi_task *task = session->cmds[i];
474 		struct bnx2i_cmd *cmd = task->dd_data;
475 
476 		if (cmd->io_tbl.bd_tbl)
477 			dma_free_coherent(&hba->pcidev->dev,
478 					  ISCSI_MAX_BDS_PER_CMD *
479 					  sizeof(struct iscsi_bd),
480 					  cmd->io_tbl.bd_tbl,
481 					  cmd->io_tbl.bd_tbl_dma);
482 	}
483 
484 }
485 
486 
487 /**
488  * bnx2i_setup_cmd_pool - sets up iscsi command pool for the session
489  * @hba:	adapter instance pointer
490  * @session:	iscsi session pointer
491  */
bnx2i_setup_cmd_pool(struct bnx2i_hba * hba,struct iscsi_session * session)492 static int bnx2i_setup_cmd_pool(struct bnx2i_hba *hba,
493 				struct iscsi_session *session)
494 {
495 	int i;
496 
497 	for (i = 0; i < session->cmds_max; i++) {
498 		struct iscsi_task *task = session->cmds[i];
499 		struct bnx2i_cmd *cmd = task->dd_data;
500 
501 		task->hdr = &cmd->hdr;
502 		task->hdr_max = sizeof(struct iscsi_hdr);
503 
504 		if (bnx2i_alloc_bdt(hba, session, cmd))
505 			goto free_bdts;
506 	}
507 
508 	return 0;
509 
510 free_bdts:
511 	bnx2i_destroy_cmd_pool(hba, session);
512 	return -ENOMEM;
513 }
514 
515 
516 /**
517  * bnx2i_setup_mp_bdt - allocate BD table resources
518  * @hba:	pointer to adapter structure
519  *
520  * Allocate memory for dummy buffer and associated BD
521  * table to be used by middle path (MP) requests
522  */
bnx2i_setup_mp_bdt(struct bnx2i_hba * hba)523 static int bnx2i_setup_mp_bdt(struct bnx2i_hba *hba)
524 {
525 	int rc = 0;
526 	struct iscsi_bd *mp_bdt;
527 	u64 addr;
528 
529 	hba->mp_bd_tbl = dma_alloc_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
530 					    &hba->mp_bd_dma, GFP_KERNEL);
531 	if (!hba->mp_bd_tbl) {
532 		printk(KERN_ERR "unable to allocate Middle Path BDT\n");
533 		rc = -1;
534 		goto out;
535 	}
536 
537 	hba->dummy_buffer = dma_alloc_coherent(&hba->pcidev->dev,
538 					       CNIC_PAGE_SIZE,
539 					       &hba->dummy_buf_dma, GFP_KERNEL);
540 	if (!hba->dummy_buffer) {
541 		printk(KERN_ERR "unable to alloc Middle Path Dummy Buffer\n");
542 		dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
543 				  hba->mp_bd_tbl, hba->mp_bd_dma);
544 		hba->mp_bd_tbl = NULL;
545 		rc = -1;
546 		goto out;
547 	}
548 
549 	mp_bdt = (struct iscsi_bd *) hba->mp_bd_tbl;
550 	addr = (unsigned long) hba->dummy_buf_dma;
551 	mp_bdt->buffer_addr_lo = addr & 0xffffffff;
552 	mp_bdt->buffer_addr_hi = addr >> 32;
553 	mp_bdt->buffer_length = CNIC_PAGE_SIZE;
554 	mp_bdt->flags = ISCSI_BD_LAST_IN_BD_CHAIN |
555 			ISCSI_BD_FIRST_IN_BD_CHAIN;
556 out:
557 	return rc;
558 }
559 
560 
561 /**
562  * bnx2i_free_mp_bdt - releases ITT back to free pool
563  * @hba:	pointer to adapter instance
564  *
565  * free MP dummy buffer and associated BD table
566  */
bnx2i_free_mp_bdt(struct bnx2i_hba * hba)567 static void bnx2i_free_mp_bdt(struct bnx2i_hba *hba)
568 {
569 	if (hba->mp_bd_tbl) {
570 		dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
571 				  hba->mp_bd_tbl, hba->mp_bd_dma);
572 		hba->mp_bd_tbl = NULL;
573 	}
574 	if (hba->dummy_buffer) {
575 		dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
576 				  hba->dummy_buffer, hba->dummy_buf_dma);
577 		hba->dummy_buffer = NULL;
578 	}
579 	return;
580 }
581 
582 /**
583  * bnx2i_drop_session - notifies iscsid of connection error.
584  * @cls_session:	iscsi cls session pointer
585  *
586  * This notifies iscsid that there is a error, so it can initiate
587  * recovery.
588  *
589  * This relies on caller using the iscsi class iterator so the object
590  * is refcounted and does not disapper from under us.
591  */
bnx2i_drop_session(struct iscsi_cls_session * cls_session)592 void bnx2i_drop_session(struct iscsi_cls_session *cls_session)
593 {
594 	iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_CONN_FAILED);
595 }
596 
597 /**
598  * bnx2i_ep_destroy_list_add - add an entry to EP destroy list
599  * @hba:	pointer to adapter instance
600  * @ep:		pointer to endpoint (transport identifier) structure
601  *
602  * EP destroy queue manager
603  */
bnx2i_ep_destroy_list_add(struct bnx2i_hba * hba,struct bnx2i_endpoint * ep)604 static int bnx2i_ep_destroy_list_add(struct bnx2i_hba *hba,
605 				     struct bnx2i_endpoint *ep)
606 {
607 	write_lock_bh(&hba->ep_rdwr_lock);
608 	list_add_tail(&ep->link, &hba->ep_destroy_list);
609 	write_unlock_bh(&hba->ep_rdwr_lock);
610 	return 0;
611 }
612 
613 /**
614  * bnx2i_ep_destroy_list_del - add an entry to EP destroy list
615  *
616  * @hba: 		pointer to adapter instance
617  * @ep: 		pointer to endpoint (transport identifier) structure
618  *
619  * EP destroy queue manager
620  */
bnx2i_ep_destroy_list_del(struct bnx2i_hba * hba,struct bnx2i_endpoint * ep)621 static int bnx2i_ep_destroy_list_del(struct bnx2i_hba *hba,
622 				     struct bnx2i_endpoint *ep)
623 {
624 	write_lock_bh(&hba->ep_rdwr_lock);
625 	list_del_init(&ep->link);
626 	write_unlock_bh(&hba->ep_rdwr_lock);
627 
628 	return 0;
629 }
630 
631 /**
632  * bnx2i_ep_ofld_list_add - add an entry to ep offload pending list
633  * @hba:	pointer to adapter instance
634  * @ep:		pointer to endpoint (transport identifier) structure
635  *
636  * pending conn offload completion queue manager
637  */
bnx2i_ep_ofld_list_add(struct bnx2i_hba * hba,struct bnx2i_endpoint * ep)638 static int bnx2i_ep_ofld_list_add(struct bnx2i_hba *hba,
639 				  struct bnx2i_endpoint *ep)
640 {
641 	write_lock_bh(&hba->ep_rdwr_lock);
642 	list_add_tail(&ep->link, &hba->ep_ofld_list);
643 	write_unlock_bh(&hba->ep_rdwr_lock);
644 	return 0;
645 }
646 
647 /**
648  * bnx2i_ep_ofld_list_del - add an entry to ep offload pending list
649  * @hba: 		pointer to adapter instance
650  * @ep: 		pointer to endpoint (transport identifier) structure
651  *
652  * pending conn offload completion queue manager
653  */
bnx2i_ep_ofld_list_del(struct bnx2i_hba * hba,struct bnx2i_endpoint * ep)654 static int bnx2i_ep_ofld_list_del(struct bnx2i_hba *hba,
655 				  struct bnx2i_endpoint *ep)
656 {
657 	write_lock_bh(&hba->ep_rdwr_lock);
658 	list_del_init(&ep->link);
659 	write_unlock_bh(&hba->ep_rdwr_lock);
660 	return 0;
661 }
662 
663 
664 /**
665  * bnx2i_find_ep_in_ofld_list - find iscsi_cid in pending list of endpoints
666  *
667  * @hba: 		pointer to adapter instance
668  * @iscsi_cid:		iscsi context ID to find
669  *
670  */
671 struct bnx2i_endpoint *
bnx2i_find_ep_in_ofld_list(struct bnx2i_hba * hba,u32 iscsi_cid)672 bnx2i_find_ep_in_ofld_list(struct bnx2i_hba *hba, u32 iscsi_cid)
673 {
674 	struct list_head *list;
675 	struct list_head *tmp;
676 	struct bnx2i_endpoint *ep = NULL;
677 
678 	read_lock_bh(&hba->ep_rdwr_lock);
679 	list_for_each_safe(list, tmp, &hba->ep_ofld_list) {
680 		ep = (struct bnx2i_endpoint *)list;
681 
682 		if (ep->ep_iscsi_cid == iscsi_cid)
683 			break;
684 		ep = NULL;
685 	}
686 	read_unlock_bh(&hba->ep_rdwr_lock);
687 
688 	if (!ep)
689 		printk(KERN_ERR "l5 cid %d not found\n", iscsi_cid);
690 	return ep;
691 }
692 
693 /**
694  * bnx2i_find_ep_in_destroy_list - find iscsi_cid in destroy list
695  * @hba: 		pointer to adapter instance
696  * @iscsi_cid:		iscsi context ID to find
697  *
698  */
699 struct bnx2i_endpoint *
bnx2i_find_ep_in_destroy_list(struct bnx2i_hba * hba,u32 iscsi_cid)700 bnx2i_find_ep_in_destroy_list(struct bnx2i_hba *hba, u32 iscsi_cid)
701 {
702 	struct list_head *list;
703 	struct list_head *tmp;
704 	struct bnx2i_endpoint *ep = NULL;
705 
706 	read_lock_bh(&hba->ep_rdwr_lock);
707 	list_for_each_safe(list, tmp, &hba->ep_destroy_list) {
708 		ep = (struct bnx2i_endpoint *)list;
709 
710 		if (ep->ep_iscsi_cid == iscsi_cid)
711 			break;
712 		ep = NULL;
713 	}
714 	read_unlock_bh(&hba->ep_rdwr_lock);
715 
716 	if (!ep)
717 		printk(KERN_ERR "l5 cid %d not found\n", iscsi_cid);
718 
719 	return ep;
720 }
721 
722 /**
723  * bnx2i_ep_active_list_add - add an entry to ep active list
724  * @hba:	pointer to adapter instance
725  * @ep:		pointer to endpoint (transport identifier) structure
726  *
727  * current active conn queue manager
728  */
bnx2i_ep_active_list_add(struct bnx2i_hba * hba,struct bnx2i_endpoint * ep)729 static void bnx2i_ep_active_list_add(struct bnx2i_hba *hba,
730 				     struct bnx2i_endpoint *ep)
731 {
732 	write_lock_bh(&hba->ep_rdwr_lock);
733 	list_add_tail(&ep->link, &hba->ep_active_list);
734 	write_unlock_bh(&hba->ep_rdwr_lock);
735 }
736 
737 
738 /**
739  * bnx2i_ep_active_list_del - deletes an entry to ep active list
740  * @hba:	pointer to adapter instance
741  * @ep:		pointer to endpoint (transport identifier) structure
742  *
743  * current active conn queue manager
744  */
bnx2i_ep_active_list_del(struct bnx2i_hba * hba,struct bnx2i_endpoint * ep)745 static void bnx2i_ep_active_list_del(struct bnx2i_hba *hba,
746 				     struct bnx2i_endpoint *ep)
747 {
748 	write_lock_bh(&hba->ep_rdwr_lock);
749 	list_del_init(&ep->link);
750 	write_unlock_bh(&hba->ep_rdwr_lock);
751 }
752 
753 
754 /**
755  * bnx2i_setup_host_queue_size - assigns shost->can_queue param
756  * @hba:	pointer to adapter instance
757  * @shost:	scsi host pointer
758  *
759  * Initializes 'can_queue' parameter based on how many outstanding commands
760  * 	the device can handle. Each device 5708/5709/57710 has different
761  *	capabilities
762  */
bnx2i_setup_host_queue_size(struct bnx2i_hba * hba,struct Scsi_Host * shost)763 static void bnx2i_setup_host_queue_size(struct bnx2i_hba *hba,
764 					struct Scsi_Host *shost)
765 {
766 	if (test_bit(BNX2I_NX2_DEV_5708, &hba->cnic_dev_type))
767 		shost->can_queue = ISCSI_MAX_CMDS_PER_HBA_5708;
768 	else if (test_bit(BNX2I_NX2_DEV_5709, &hba->cnic_dev_type))
769 		shost->can_queue = ISCSI_MAX_CMDS_PER_HBA_5709;
770 	else if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type))
771 		shost->can_queue = ISCSI_MAX_CMDS_PER_HBA_57710;
772 	else
773 		shost->can_queue = ISCSI_MAX_CMDS_PER_HBA_5708;
774 }
775 
776 
777 /**
778  * bnx2i_alloc_hba - allocate and init adapter instance
779  * @cnic:	cnic device pointer
780  *
781  * allocate & initialize adapter structure and call other
782  *	support routines to do per adapter initialization
783  */
bnx2i_alloc_hba(struct cnic_dev * cnic)784 struct bnx2i_hba *bnx2i_alloc_hba(struct cnic_dev *cnic)
785 {
786 	struct Scsi_Host *shost;
787 	struct bnx2i_hba *hba;
788 
789 	shost = iscsi_host_alloc(&bnx2i_host_template, sizeof(*hba), 0);
790 	if (!shost)
791 		return NULL;
792 	shost->dma_boundary = cnic->pcidev->dma_mask;
793 	shost->transportt = bnx2i_scsi_xport_template;
794 	shost->max_id = ISCSI_MAX_CONNS_PER_HBA - 1;
795 	shost->max_channel = 0;
796 	shost->max_lun = 512;
797 	shost->max_cmd_len = 16;
798 
799 	hba = iscsi_host_priv(shost);
800 	hba->shost = shost;
801 	hba->netdev = cnic->netdev;
802 	/* Get PCI related information and update hba struct members */
803 	hba->pcidev = cnic->pcidev;
804 	pci_dev_get(hba->pcidev);
805 	hba->pci_did = hba->pcidev->device;
806 	hba->pci_vid = hba->pcidev->vendor;
807 	hba->pci_sdid = hba->pcidev->subsystem_device;
808 	hba->pci_svid = hba->pcidev->subsystem_vendor;
809 	hba->pci_func = PCI_FUNC(hba->pcidev->devfn);
810 	hba->pci_devno = PCI_SLOT(hba->pcidev->devfn);
811 
812 	bnx2i_identify_device(hba, cnic);
813 	bnx2i_setup_host_queue_size(hba, shost);
814 
815 	hba->reg_base = pci_resource_start(hba->pcidev, 0);
816 	if (test_bit(BNX2I_NX2_DEV_5709, &hba->cnic_dev_type)) {
817 		hba->regview = pci_iomap(hba->pcidev, 0, BNX2_MQ_CONFIG2);
818 		if (!hba->regview)
819 			goto ioreg_map_err;
820 	} else if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type)) {
821 		hba->regview = pci_iomap(hba->pcidev, 0, 4096);
822 		if (!hba->regview)
823 			goto ioreg_map_err;
824 	}
825 
826 	if (bnx2i_setup_mp_bdt(hba))
827 		goto mp_bdt_mem_err;
828 
829 	INIT_LIST_HEAD(&hba->ep_ofld_list);
830 	INIT_LIST_HEAD(&hba->ep_active_list);
831 	INIT_LIST_HEAD(&hba->ep_destroy_list);
832 	rwlock_init(&hba->ep_rdwr_lock);
833 
834 	hba->mtu_supported = BNX2I_MAX_MTU_SUPPORTED;
835 
836 	/* different values for 5708/5709/57710 */
837 	hba->max_active_conns = ISCSI_MAX_CONNS_PER_HBA;
838 
839 	if (bnx2i_setup_free_cid_que(hba))
840 		goto cid_que_err;
841 
842 	/* SQ/RQ/CQ size can be changed via sysfx interface */
843 	if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type)) {
844 		if (sq_size && sq_size <= BNX2I_5770X_SQ_WQES_MAX)
845 			hba->max_sqes = sq_size;
846 		else
847 			hba->max_sqes = BNX2I_5770X_SQ_WQES_DEFAULT;
848 	} else {	/* 5706/5708/5709 */
849 		if (sq_size && sq_size <= BNX2I_570X_SQ_WQES_MAX)
850 			hba->max_sqes = sq_size;
851 		else
852 			hba->max_sqes = BNX2I_570X_SQ_WQES_DEFAULT;
853 	}
854 
855 	hba->max_rqes = rq_size;
856 	hba->max_cqes = hba->max_sqes + rq_size;
857 	if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type)) {
858 		if (hba->max_cqes > BNX2I_5770X_CQ_WQES_MAX)
859 			hba->max_cqes = BNX2I_5770X_CQ_WQES_MAX;
860 	} else if (hba->max_cqes > BNX2I_570X_CQ_WQES_MAX)
861 		hba->max_cqes = BNX2I_570X_CQ_WQES_MAX;
862 
863 	hba->num_ccell = hba->max_sqes / 2;
864 
865 	spin_lock_init(&hba->lock);
866 	mutex_init(&hba->net_dev_lock);
867 	init_waitqueue_head(&hba->eh_wait);
868 	if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type)) {
869 		hba->hba_shutdown_tmo = 30 * HZ;
870 		hba->conn_teardown_tmo = 20 * HZ;
871 		hba->conn_ctx_destroy_tmo = 6 * HZ;
872 	} else {	/* 5706/5708/5709 */
873 		hba->hba_shutdown_tmo = 20 * HZ;
874 		hba->conn_teardown_tmo = 10 * HZ;
875 		hba->conn_ctx_destroy_tmo = 2 * HZ;
876 	}
877 
878 #ifdef CONFIG_32BIT
879 	spin_lock_init(&hba->stat_lock);
880 #endif
881 	memset(&hba->stats, 0, sizeof(struct iscsi_stats_info));
882 
883 	if (iscsi_host_add(shost, &hba->pcidev->dev))
884 		goto free_dump_mem;
885 	return hba;
886 
887 free_dump_mem:
888 	bnx2i_release_free_cid_que(hba);
889 cid_que_err:
890 	bnx2i_free_mp_bdt(hba);
891 mp_bdt_mem_err:
892 	if (hba->regview) {
893 		pci_iounmap(hba->pcidev, hba->regview);
894 		hba->regview = NULL;
895 	}
896 ioreg_map_err:
897 	pci_dev_put(hba->pcidev);
898 	scsi_host_put(shost);
899 	return NULL;
900 }
901 
902 /**
903  * bnx2i_free_hba- releases hba structure and resources held by the adapter
904  * @hba:	pointer to adapter instance
905  *
906  * free adapter structure and call various cleanup routines.
907  */
bnx2i_free_hba(struct bnx2i_hba * hba)908 void bnx2i_free_hba(struct bnx2i_hba *hba)
909 {
910 	struct Scsi_Host *shost = hba->shost;
911 
912 	iscsi_host_remove(shost, false);
913 	INIT_LIST_HEAD(&hba->ep_ofld_list);
914 	INIT_LIST_HEAD(&hba->ep_active_list);
915 	INIT_LIST_HEAD(&hba->ep_destroy_list);
916 
917 	if (hba->regview) {
918 		pci_iounmap(hba->pcidev, hba->regview);
919 		hba->regview = NULL;
920 	}
921 	pci_dev_put(hba->pcidev);
922 	bnx2i_free_mp_bdt(hba);
923 	bnx2i_release_free_cid_que(hba);
924 	iscsi_host_free(shost);
925 }
926 
927 /**
928  * bnx2i_conn_free_login_resources - free DMA resources used for login process
929  * @hba:		pointer to adapter instance
930  * @bnx2i_conn:		iscsi connection pointer
931  *
932  * Login related resources, mostly BDT & payload DMA memory is freed
933  */
bnx2i_conn_free_login_resources(struct bnx2i_hba * hba,struct bnx2i_conn * bnx2i_conn)934 static void bnx2i_conn_free_login_resources(struct bnx2i_hba *hba,
935 					    struct bnx2i_conn *bnx2i_conn)
936 {
937 	if (bnx2i_conn->gen_pdu.resp_bd_tbl) {
938 		dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
939 				  bnx2i_conn->gen_pdu.resp_bd_tbl,
940 				  bnx2i_conn->gen_pdu.resp_bd_dma);
941 		bnx2i_conn->gen_pdu.resp_bd_tbl = NULL;
942 	}
943 
944 	if (bnx2i_conn->gen_pdu.req_bd_tbl) {
945 		dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
946 				  bnx2i_conn->gen_pdu.req_bd_tbl,
947 				  bnx2i_conn->gen_pdu.req_bd_dma);
948 		bnx2i_conn->gen_pdu.req_bd_tbl = NULL;
949 	}
950 
951 	if (bnx2i_conn->gen_pdu.resp_buf) {
952 		dma_free_coherent(&hba->pcidev->dev,
953 				  ISCSI_DEF_MAX_RECV_SEG_LEN,
954 				  bnx2i_conn->gen_pdu.resp_buf,
955 				  bnx2i_conn->gen_pdu.resp_dma_addr);
956 		bnx2i_conn->gen_pdu.resp_buf = NULL;
957 	}
958 
959 	if (bnx2i_conn->gen_pdu.req_buf) {
960 		dma_free_coherent(&hba->pcidev->dev,
961 				  ISCSI_DEF_MAX_RECV_SEG_LEN,
962 				  bnx2i_conn->gen_pdu.req_buf,
963 				  bnx2i_conn->gen_pdu.req_dma_addr);
964 		bnx2i_conn->gen_pdu.req_buf = NULL;
965 	}
966 }
967 
968 /**
969  * bnx2i_conn_alloc_login_resources - alloc DMA resources for login/nop.
970  * @hba:		pointer to adapter instance
971  * @bnx2i_conn:		iscsi connection pointer
972  *
973  * Mgmt task DNA resources are allocated in this routine.
974  */
bnx2i_conn_alloc_login_resources(struct bnx2i_hba * hba,struct bnx2i_conn * bnx2i_conn)975 static int bnx2i_conn_alloc_login_resources(struct bnx2i_hba *hba,
976 					    struct bnx2i_conn *bnx2i_conn)
977 {
978 	/* Allocate memory for login request/response buffers */
979 	bnx2i_conn->gen_pdu.req_buf =
980 		dma_alloc_coherent(&hba->pcidev->dev,
981 				   ISCSI_DEF_MAX_RECV_SEG_LEN,
982 				   &bnx2i_conn->gen_pdu.req_dma_addr,
983 				   GFP_KERNEL);
984 	if (bnx2i_conn->gen_pdu.req_buf == NULL)
985 		goto login_req_buf_failure;
986 
987 	bnx2i_conn->gen_pdu.req_buf_size = 0;
988 	bnx2i_conn->gen_pdu.req_wr_ptr = bnx2i_conn->gen_pdu.req_buf;
989 
990 	bnx2i_conn->gen_pdu.resp_buf =
991 		dma_alloc_coherent(&hba->pcidev->dev,
992 				   ISCSI_DEF_MAX_RECV_SEG_LEN,
993 				   &bnx2i_conn->gen_pdu.resp_dma_addr,
994 				   GFP_KERNEL);
995 	if (bnx2i_conn->gen_pdu.resp_buf == NULL)
996 		goto login_resp_buf_failure;
997 
998 	bnx2i_conn->gen_pdu.resp_buf_size = ISCSI_DEF_MAX_RECV_SEG_LEN;
999 	bnx2i_conn->gen_pdu.resp_wr_ptr = bnx2i_conn->gen_pdu.resp_buf;
1000 
1001 	bnx2i_conn->gen_pdu.req_bd_tbl =
1002 		dma_alloc_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
1003 				   &bnx2i_conn->gen_pdu.req_bd_dma, GFP_KERNEL);
1004 	if (bnx2i_conn->gen_pdu.req_bd_tbl == NULL)
1005 		goto login_req_bd_tbl_failure;
1006 
1007 	bnx2i_conn->gen_pdu.resp_bd_tbl =
1008 		dma_alloc_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
1009 				   &bnx2i_conn->gen_pdu.resp_bd_dma,
1010 				   GFP_KERNEL);
1011 	if (bnx2i_conn->gen_pdu.resp_bd_tbl == NULL)
1012 		goto login_resp_bd_tbl_failure;
1013 
1014 	return 0;
1015 
1016 login_resp_bd_tbl_failure:
1017 	dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
1018 			  bnx2i_conn->gen_pdu.req_bd_tbl,
1019 			  bnx2i_conn->gen_pdu.req_bd_dma);
1020 	bnx2i_conn->gen_pdu.req_bd_tbl = NULL;
1021 
1022 login_req_bd_tbl_failure:
1023 	dma_free_coherent(&hba->pcidev->dev, ISCSI_DEF_MAX_RECV_SEG_LEN,
1024 			  bnx2i_conn->gen_pdu.resp_buf,
1025 			  bnx2i_conn->gen_pdu.resp_dma_addr);
1026 	bnx2i_conn->gen_pdu.resp_buf = NULL;
1027 login_resp_buf_failure:
1028 	dma_free_coherent(&hba->pcidev->dev, ISCSI_DEF_MAX_RECV_SEG_LEN,
1029 			  bnx2i_conn->gen_pdu.req_buf,
1030 			  bnx2i_conn->gen_pdu.req_dma_addr);
1031 	bnx2i_conn->gen_pdu.req_buf = NULL;
1032 login_req_buf_failure:
1033 	iscsi_conn_printk(KERN_ERR, bnx2i_conn->cls_conn->dd_data,
1034 			  "login resource alloc failed!!\n");
1035 	return -ENOMEM;
1036 
1037 }
1038 
1039 
1040 /**
1041  * bnx2i_iscsi_prep_generic_pdu_bd - prepares BD table.
1042  * @bnx2i_conn:		iscsi connection pointer
1043  *
1044  * Allocates buffers and BD tables before shipping requests to cnic
1045  *	for PDUs prepared by 'iscsid' daemon
1046  */
bnx2i_iscsi_prep_generic_pdu_bd(struct bnx2i_conn * bnx2i_conn)1047 static void bnx2i_iscsi_prep_generic_pdu_bd(struct bnx2i_conn *bnx2i_conn)
1048 {
1049 	struct iscsi_bd *bd_tbl;
1050 
1051 	bd_tbl = (struct iscsi_bd *) bnx2i_conn->gen_pdu.req_bd_tbl;
1052 
1053 	bd_tbl->buffer_addr_hi =
1054 		(u32) ((u64) bnx2i_conn->gen_pdu.req_dma_addr >> 32);
1055 	bd_tbl->buffer_addr_lo = (u32) bnx2i_conn->gen_pdu.req_dma_addr;
1056 	bd_tbl->buffer_length = bnx2i_conn->gen_pdu.req_wr_ptr -
1057 				bnx2i_conn->gen_pdu.req_buf;
1058 	bd_tbl->reserved0 = 0;
1059 	bd_tbl->flags = ISCSI_BD_LAST_IN_BD_CHAIN |
1060 			ISCSI_BD_FIRST_IN_BD_CHAIN;
1061 
1062 	bd_tbl = (struct iscsi_bd  *) bnx2i_conn->gen_pdu.resp_bd_tbl;
1063 	bd_tbl->buffer_addr_hi = (u64) bnx2i_conn->gen_pdu.resp_dma_addr >> 32;
1064 	bd_tbl->buffer_addr_lo = (u32) bnx2i_conn->gen_pdu.resp_dma_addr;
1065 	bd_tbl->buffer_length = ISCSI_DEF_MAX_RECV_SEG_LEN;
1066 	bd_tbl->reserved0 = 0;
1067 	bd_tbl->flags = ISCSI_BD_LAST_IN_BD_CHAIN |
1068 			ISCSI_BD_FIRST_IN_BD_CHAIN;
1069 }
1070 
1071 
1072 /**
1073  * bnx2i_iscsi_send_generic_request - called to send mgmt tasks.
1074  * @task:	transport layer task pointer
1075  *
1076  * called to transmit PDUs prepared by the 'iscsid' daemon. iSCSI login,
1077  *	Nop-out and Logout requests flow through this path.
1078  */
bnx2i_iscsi_send_generic_request(struct iscsi_task * task)1079 static int bnx2i_iscsi_send_generic_request(struct iscsi_task *task)
1080 {
1081 	struct bnx2i_cmd *cmd = task->dd_data;
1082 	struct bnx2i_conn *bnx2i_conn = cmd->conn;
1083 	int rc = 0;
1084 	char *buf;
1085 	int data_len;
1086 
1087 	bnx2i_iscsi_prep_generic_pdu_bd(bnx2i_conn);
1088 	switch (task->hdr->opcode & ISCSI_OPCODE_MASK) {
1089 	case ISCSI_OP_LOGIN:
1090 		bnx2i_send_iscsi_login(bnx2i_conn, task);
1091 		break;
1092 	case ISCSI_OP_NOOP_OUT:
1093 		data_len = bnx2i_conn->gen_pdu.req_buf_size;
1094 		buf = bnx2i_conn->gen_pdu.req_buf;
1095 		if (data_len)
1096 			rc = bnx2i_send_iscsi_nopout(bnx2i_conn, task,
1097 						     buf, data_len, 1);
1098 		else
1099 			rc = bnx2i_send_iscsi_nopout(bnx2i_conn, task,
1100 						     NULL, 0, 1);
1101 		break;
1102 	case ISCSI_OP_LOGOUT:
1103 		rc = bnx2i_send_iscsi_logout(bnx2i_conn, task);
1104 		break;
1105 	case ISCSI_OP_SCSI_TMFUNC:
1106 		rc = bnx2i_send_iscsi_tmf(bnx2i_conn, task);
1107 		break;
1108 	case ISCSI_OP_TEXT:
1109 		rc = bnx2i_send_iscsi_text(bnx2i_conn, task);
1110 		break;
1111 	default:
1112 		iscsi_conn_printk(KERN_ALERT, bnx2i_conn->cls_conn->dd_data,
1113 				  "send_gen: unsupported op 0x%x\n",
1114 				  task->hdr->opcode);
1115 	}
1116 	return rc;
1117 }
1118 
1119 
1120 /**********************************************************************
1121  *		SCSI-ML Interface
1122  **********************************************************************/
1123 
1124 /**
1125  * bnx2i_cpy_scsi_cdb - copies LUN & CDB fields in required format to sq wqe
1126  * @sc:		SCSI-ML command pointer
1127  * @cmd:	iscsi cmd pointer
1128  */
bnx2i_cpy_scsi_cdb(struct scsi_cmnd * sc,struct bnx2i_cmd * cmd)1129 static void bnx2i_cpy_scsi_cdb(struct scsi_cmnd *sc, struct bnx2i_cmd *cmd)
1130 {
1131 	u32 dword;
1132 	int lpcnt;
1133 	u8 *srcp;
1134 	u32 *dstp;
1135 	u32 scsi_lun[2];
1136 
1137 	int_to_scsilun(sc->device->lun, (struct scsi_lun *) scsi_lun);
1138 	cmd->req.lun[0] = be32_to_cpu(scsi_lun[0]);
1139 	cmd->req.lun[1] = be32_to_cpu(scsi_lun[1]);
1140 
1141 	lpcnt = cmd->scsi_cmd->cmd_len / sizeof(dword);
1142 	srcp = (u8 *) sc->cmnd;
1143 	dstp = (u32 *) cmd->req.cdb;
1144 	while (lpcnt--) {
1145 		memcpy(&dword, (const void *) srcp, 4);
1146 		*dstp = cpu_to_be32(dword);
1147 		srcp += 4;
1148 		dstp++;
1149 	}
1150 	if (sc->cmd_len & 0x3) {
1151 		dword = (u32) srcp[0] | ((u32) srcp[1] << 8);
1152 		*dstp = cpu_to_be32(dword);
1153 	}
1154 }
1155 
bnx2i_cleanup_task(struct iscsi_task * task)1156 static void bnx2i_cleanup_task(struct iscsi_task *task)
1157 {
1158 	struct iscsi_conn *conn = task->conn;
1159 	struct bnx2i_conn *bnx2i_conn = conn->dd_data;
1160 	struct bnx2i_hba *hba = bnx2i_conn->hba;
1161 
1162 	/*
1163 	 * mgmt task or cmd was never sent to us to transmit.
1164 	 */
1165 	if (!task->sc || task->state == ISCSI_TASK_PENDING)
1166 		return;
1167 	/*
1168 	 * need to clean-up task context to claim dma buffers
1169 	 */
1170 	if (task->state == ISCSI_TASK_ABRT_TMF) {
1171 		bnx2i_send_cmd_cleanup_req(hba, task->dd_data);
1172 
1173 		spin_unlock_bh(&conn->session->back_lock);
1174 		wait_for_completion_timeout(&bnx2i_conn->cmd_cleanup_cmpl,
1175 				msecs_to_jiffies(ISCSI_CMD_CLEANUP_TIMEOUT));
1176 		spin_lock_bh(&conn->session->back_lock);
1177 	}
1178 	bnx2i_iscsi_unmap_sg_list(task->dd_data);
1179 }
1180 
1181 /**
1182  * bnx2i_mtask_xmit - transmit mtask to chip for further processing
1183  * @conn:	transport layer conn structure pointer
1184  * @task:	transport layer command structure pointer
1185  */
1186 static int
bnx2i_mtask_xmit(struct iscsi_conn * conn,struct iscsi_task * task)1187 bnx2i_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task)
1188 {
1189 	struct bnx2i_conn *bnx2i_conn = conn->dd_data;
1190 	struct bnx2i_hba *hba = bnx2i_conn->hba;
1191 	struct bnx2i_cmd *cmd = task->dd_data;
1192 
1193 	memset(bnx2i_conn->gen_pdu.req_buf, 0, ISCSI_DEF_MAX_RECV_SEG_LEN);
1194 
1195 	bnx2i_setup_cmd_wqe_template(cmd);
1196 	bnx2i_conn->gen_pdu.req_buf_size = task->data_count;
1197 
1198 	/* Tx PDU/data length count */
1199 	ADD_STATS_64(hba, tx_pdus, 1);
1200 	ADD_STATS_64(hba, tx_bytes, task->data_count);
1201 
1202 	if (task->data_count) {
1203 		memcpy(bnx2i_conn->gen_pdu.req_buf, task->data,
1204 		       task->data_count);
1205 		bnx2i_conn->gen_pdu.req_wr_ptr =
1206 			bnx2i_conn->gen_pdu.req_buf + task->data_count;
1207 	}
1208 	cmd->conn = conn->dd_data;
1209 	cmd->scsi_cmd = NULL;
1210 	return bnx2i_iscsi_send_generic_request(task);
1211 }
1212 
1213 /**
1214  * bnx2i_task_xmit - transmit iscsi command to chip for further processing
1215  * @task:	transport layer command structure pointer
1216  *
1217  * maps SG buffers and send request to chip/firmware in the form of SQ WQE
1218  */
bnx2i_task_xmit(struct iscsi_task * task)1219 static int bnx2i_task_xmit(struct iscsi_task *task)
1220 {
1221 	struct iscsi_conn *conn = task->conn;
1222 	struct iscsi_session *session = conn->session;
1223 	struct Scsi_Host *shost = iscsi_session_to_shost(session->cls_session);
1224 	struct bnx2i_hba *hba = iscsi_host_priv(shost);
1225 	struct bnx2i_conn *bnx2i_conn = conn->dd_data;
1226 	struct scsi_cmnd *sc = task->sc;
1227 	struct bnx2i_cmd *cmd = task->dd_data;
1228 	struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)task->hdr;
1229 
1230 	if (atomic_read(&bnx2i_conn->ep->num_active_cmds) + 1  >
1231 	    hba->max_sqes)
1232 		return -ENOMEM;
1233 
1234 	/*
1235 	 * If there is no scsi_cmnd this must be a mgmt task
1236 	 */
1237 	if (!sc)
1238 		return bnx2i_mtask_xmit(conn, task);
1239 
1240 	bnx2i_setup_cmd_wqe_template(cmd);
1241 	cmd->req.op_code = ISCSI_OP_SCSI_CMD;
1242 	cmd->conn = bnx2i_conn;
1243 	cmd->scsi_cmd = sc;
1244 	cmd->req.total_data_transfer_length = scsi_bufflen(sc);
1245 	cmd->req.cmd_sn = be32_to_cpu(hdr->cmdsn);
1246 
1247 	bnx2i_iscsi_map_sg_list(cmd);
1248 	bnx2i_cpy_scsi_cdb(sc, cmd);
1249 
1250 	cmd->req.op_attr = ISCSI_ATTR_SIMPLE;
1251 	if (sc->sc_data_direction == DMA_TO_DEVICE) {
1252 		cmd->req.op_attr |= ISCSI_CMD_REQUEST_WRITE;
1253 		cmd->req.itt = task->itt |
1254 			(ISCSI_TASK_TYPE_WRITE << ISCSI_CMD_REQUEST_TYPE_SHIFT);
1255 		bnx2i_setup_write_cmd_bd_info(task);
1256 	} else {
1257 		if (scsi_bufflen(sc))
1258 			cmd->req.op_attr |= ISCSI_CMD_REQUEST_READ;
1259 		cmd->req.itt = task->itt |
1260 			(ISCSI_TASK_TYPE_READ << ISCSI_CMD_REQUEST_TYPE_SHIFT);
1261 	}
1262 
1263 	cmd->req.num_bds = cmd->io_tbl.bd_valid;
1264 	if (!cmd->io_tbl.bd_valid) {
1265 		cmd->req.bd_list_addr_lo = (u32) hba->mp_bd_dma;
1266 		cmd->req.bd_list_addr_hi = (u32) ((u64) hba->mp_bd_dma >> 32);
1267 		cmd->req.num_bds = 1;
1268 	}
1269 
1270 	bnx2i_send_iscsi_scsicmd(bnx2i_conn, cmd);
1271 	return 0;
1272 }
1273 
1274 /**
1275  * bnx2i_session_create - create a new iscsi session
1276  * @ep:		pointer to iscsi endpoint
1277  * @cmds_max:		user specified maximum commands
1278  * @qdepth:		scsi queue depth to support
1279  * @initial_cmdsn:	initial iscsi CMDSN to be used for this session
1280  *
1281  * Creates a new iSCSI session instance on given device.
1282  */
1283 static struct iscsi_cls_session *
bnx2i_session_create(struct iscsi_endpoint * ep,uint16_t cmds_max,uint16_t qdepth,uint32_t initial_cmdsn)1284 bnx2i_session_create(struct iscsi_endpoint *ep,
1285 		     uint16_t cmds_max, uint16_t qdepth,
1286 		     uint32_t initial_cmdsn)
1287 {
1288 	struct Scsi_Host *shost;
1289 	struct iscsi_cls_session *cls_session;
1290 	struct bnx2i_hba *hba;
1291 	struct bnx2i_endpoint *bnx2i_ep;
1292 
1293 	if (!ep) {
1294 		printk(KERN_ERR "bnx2i: missing ep.\n");
1295 		return NULL;
1296 	}
1297 
1298 	bnx2i_ep = ep->dd_data;
1299 	shost = bnx2i_ep->hba->shost;
1300 	hba = iscsi_host_priv(shost);
1301 	if (bnx2i_adapter_ready(hba))
1302 		return NULL;
1303 
1304 	/*
1305 	 * user can override hw limit as long as it is within
1306 	 * the min/max.
1307 	 */
1308 	if (cmds_max > hba->max_sqes)
1309 		cmds_max = hba->max_sqes;
1310 	else if (cmds_max < BNX2I_SQ_WQES_MIN)
1311 		cmds_max = BNX2I_SQ_WQES_MIN;
1312 
1313 	cls_session = iscsi_session_setup(&bnx2i_iscsi_transport, shost,
1314 					  cmds_max, 0, sizeof(struct bnx2i_cmd),
1315 					  initial_cmdsn, ISCSI_MAX_TARGET);
1316 	if (!cls_session)
1317 		return NULL;
1318 
1319 	if (bnx2i_setup_cmd_pool(hba, cls_session->dd_data))
1320 		goto session_teardown;
1321 	return cls_session;
1322 
1323 session_teardown:
1324 	iscsi_session_teardown(cls_session);
1325 	return NULL;
1326 }
1327 
1328 
1329 /**
1330  * bnx2i_session_destroy - destroys iscsi session
1331  * @cls_session:	pointer to iscsi cls session
1332  *
1333  * Destroys previously created iSCSI session instance and releases
1334  *	all resources held by it
1335  */
bnx2i_session_destroy(struct iscsi_cls_session * cls_session)1336 static void bnx2i_session_destroy(struct iscsi_cls_session *cls_session)
1337 {
1338 	struct iscsi_session *session = cls_session->dd_data;
1339 	struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1340 	struct bnx2i_hba *hba = iscsi_host_priv(shost);
1341 
1342 	bnx2i_destroy_cmd_pool(hba, session);
1343 	iscsi_session_teardown(cls_session);
1344 }
1345 
1346 
1347 /**
1348  * bnx2i_conn_create - create iscsi connection instance
1349  * @cls_session:	pointer to iscsi cls session
1350  * @cid:		iscsi cid as per rfc (not NX2's CID terminology)
1351  *
1352  * Creates a new iSCSI connection instance for a given session
1353  */
1354 static struct iscsi_cls_conn *
bnx2i_conn_create(struct iscsi_cls_session * cls_session,uint32_t cid)1355 bnx2i_conn_create(struct iscsi_cls_session *cls_session, uint32_t cid)
1356 {
1357 	struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1358 	struct bnx2i_hba *hba = iscsi_host_priv(shost);
1359 	struct bnx2i_conn *bnx2i_conn;
1360 	struct iscsi_cls_conn *cls_conn;
1361 	struct iscsi_conn *conn;
1362 
1363 	cls_conn = iscsi_conn_setup(cls_session, sizeof(*bnx2i_conn),
1364 				    cid);
1365 	if (!cls_conn)
1366 		return NULL;
1367 	conn = cls_conn->dd_data;
1368 
1369 	bnx2i_conn = conn->dd_data;
1370 	bnx2i_conn->cls_conn = cls_conn;
1371 	bnx2i_conn->hba = hba;
1372 
1373 	atomic_set(&bnx2i_conn->work_cnt, 0);
1374 
1375 	/* 'ep' ptr will be assigned in bind() call */
1376 	bnx2i_conn->ep = NULL;
1377 	init_completion(&bnx2i_conn->cmd_cleanup_cmpl);
1378 
1379 	if (bnx2i_conn_alloc_login_resources(hba, bnx2i_conn)) {
1380 		iscsi_conn_printk(KERN_ALERT, conn,
1381 				  "conn_new: login resc alloc failed!!\n");
1382 		goto free_conn;
1383 	}
1384 
1385 	return cls_conn;
1386 
1387 free_conn:
1388 	iscsi_conn_teardown(cls_conn);
1389 	return NULL;
1390 }
1391 
1392 /**
1393  * bnx2i_conn_bind - binds iscsi sess, conn and ep objects together
1394  * @cls_session:	pointer to iscsi cls session
1395  * @cls_conn:		pointer to iscsi cls conn
1396  * @transport_fd:	64-bit EP handle
1397  * @is_leading:		leading connection on this session?
1398  *
1399  * Binds together iSCSI session instance, iSCSI connection instance
1400  *	and the TCP connection. This routine returns error code if
1401  *	TCP connection does not belong on the device iSCSI sess/conn
1402  *	is bound
1403  */
bnx2i_conn_bind(struct iscsi_cls_session * cls_session,struct iscsi_cls_conn * cls_conn,uint64_t transport_fd,int is_leading)1404 static int bnx2i_conn_bind(struct iscsi_cls_session *cls_session,
1405 			   struct iscsi_cls_conn *cls_conn,
1406 			   uint64_t transport_fd, int is_leading)
1407 {
1408 	struct iscsi_conn *conn = cls_conn->dd_data;
1409 	struct bnx2i_conn *bnx2i_conn = conn->dd_data;
1410 	struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1411 	struct bnx2i_hba *hba = iscsi_host_priv(shost);
1412 	struct bnx2i_endpoint *bnx2i_ep;
1413 	struct iscsi_endpoint *ep;
1414 	int ret_code;
1415 
1416 	ep = iscsi_lookup_endpoint(transport_fd);
1417 	if (!ep)
1418 		return -EINVAL;
1419 	/*
1420 	 * Forcefully terminate all in progress connection recovery at the
1421 	 * earliest, either in bind(), send_pdu(LOGIN), or conn_start()
1422 	 */
1423 	if (bnx2i_adapter_ready(hba)) {
1424 		ret_code = -EIO;
1425 		goto put_ep;
1426 	}
1427 
1428 	bnx2i_ep = ep->dd_data;
1429 	if ((bnx2i_ep->state == EP_STATE_TCP_FIN_RCVD) ||
1430 	    (bnx2i_ep->state == EP_STATE_TCP_RST_RCVD)) {
1431 		/* Peer disconnect via' FIN or RST */
1432 		ret_code = -EINVAL;
1433 		goto put_ep;
1434 	}
1435 
1436 	if (iscsi_conn_bind(cls_session, cls_conn, is_leading)) {
1437 		ret_code = -EINVAL;
1438 		goto put_ep;
1439 	}
1440 
1441 	if (bnx2i_ep->hba != hba) {
1442 		/* Error - TCP connection does not belong to this device
1443 		 */
1444 		iscsi_conn_printk(KERN_ALERT, cls_conn->dd_data,
1445 				  "conn bind, ep=0x%p (%s) does not",
1446 				  bnx2i_ep, bnx2i_ep->hba->netdev->name);
1447 		iscsi_conn_printk(KERN_ALERT, cls_conn->dd_data,
1448 				  "belong to hba (%s)\n",
1449 				  hba->netdev->name);
1450 		ret_code = -EEXIST;
1451 		goto put_ep;
1452 	}
1453 	bnx2i_ep->conn = bnx2i_conn;
1454 	bnx2i_conn->ep = bnx2i_ep;
1455 	bnx2i_conn->iscsi_conn_cid = bnx2i_ep->ep_iscsi_cid;
1456 	bnx2i_conn->fw_cid = bnx2i_ep->ep_cid;
1457 
1458 	ret_code = bnx2i_bind_conn_to_iscsi_cid(hba, bnx2i_conn,
1459 						bnx2i_ep->ep_iscsi_cid);
1460 
1461 	/* 5706/5708/5709 FW takes RQ as full when initiated, but for 57710
1462 	 * driver needs to explicitly replenish RQ index during setup.
1463 	 */
1464 	if (test_bit(BNX2I_NX2_DEV_57710, &bnx2i_ep->hba->cnic_dev_type))
1465 		bnx2i_put_rq_buf(bnx2i_conn, 0);
1466 
1467 	bnx2i_arm_cq_event_coalescing(bnx2i_conn->ep, CNIC_ARM_CQE);
1468 put_ep:
1469 	iscsi_put_endpoint(ep);
1470 	return ret_code;
1471 }
1472 
1473 
1474 /**
1475  * bnx2i_conn_destroy - destroy iscsi connection instance & release resources
1476  * @cls_conn:	pointer to iscsi cls conn
1477  *
1478  * Destroy an iSCSI connection instance and release memory resources held by
1479  *	this connection
1480  */
bnx2i_conn_destroy(struct iscsi_cls_conn * cls_conn)1481 static void bnx2i_conn_destroy(struct iscsi_cls_conn *cls_conn)
1482 {
1483 	struct iscsi_conn *conn = cls_conn->dd_data;
1484 	struct bnx2i_conn *bnx2i_conn = conn->dd_data;
1485 	struct Scsi_Host *shost;
1486 	struct bnx2i_hba *hba;
1487 	struct bnx2i_work *work, *tmp;
1488 	unsigned cpu = 0;
1489 	struct bnx2i_percpu_s *p;
1490 
1491 	shost = iscsi_session_to_shost(iscsi_conn_to_session(cls_conn));
1492 	hba = iscsi_host_priv(shost);
1493 
1494 	bnx2i_conn_free_login_resources(hba, bnx2i_conn);
1495 
1496 	if (atomic_read(&bnx2i_conn->work_cnt)) {
1497 		for_each_online_cpu(cpu) {
1498 			p = &per_cpu(bnx2i_percpu, cpu);
1499 			spin_lock_bh(&p->p_work_lock);
1500 			list_for_each_entry_safe(work, tmp,
1501 						 &p->work_list, list) {
1502 				if (work->session == conn->session &&
1503 				    work->bnx2i_conn == bnx2i_conn) {
1504 					list_del_init(&work->list);
1505 					kfree(work);
1506 					if (!atomic_dec_and_test(
1507 							&bnx2i_conn->work_cnt))
1508 						break;
1509 				}
1510 			}
1511 			spin_unlock_bh(&p->p_work_lock);
1512 		}
1513 	}
1514 
1515 	iscsi_conn_teardown(cls_conn);
1516 }
1517 
1518 
1519 /**
1520  * bnx2i_ep_get_param - return iscsi ep parameter to caller
1521  * @ep:		pointer to iscsi endpoint
1522  * @param:	parameter type identifier
1523  * @buf: 	buffer pointer
1524  *
1525  * returns iSCSI ep parameters
1526  */
bnx2i_ep_get_param(struct iscsi_endpoint * ep,enum iscsi_param param,char * buf)1527 static int bnx2i_ep_get_param(struct iscsi_endpoint *ep,
1528 			      enum iscsi_param param, char *buf)
1529 {
1530 	struct bnx2i_endpoint *bnx2i_ep = ep->dd_data;
1531 	struct bnx2i_hba *hba = bnx2i_ep->hba;
1532 	int len = -ENOTCONN;
1533 
1534 	if (!hba)
1535 		return -ENOTCONN;
1536 
1537 	switch (param) {
1538 	case ISCSI_PARAM_CONN_PORT:
1539 		mutex_lock(&hba->net_dev_lock);
1540 		if (bnx2i_ep->cm_sk)
1541 			len = sprintf(buf, "%hu\n", bnx2i_ep->cm_sk->dst_port);
1542 		mutex_unlock(&hba->net_dev_lock);
1543 		break;
1544 	case ISCSI_PARAM_CONN_ADDRESS:
1545 		mutex_lock(&hba->net_dev_lock);
1546 		if (bnx2i_ep->cm_sk)
1547 			len = sprintf(buf, "%pI4\n", &bnx2i_ep->cm_sk->dst_ip);
1548 		mutex_unlock(&hba->net_dev_lock);
1549 		break;
1550 	default:
1551 		return -ENOSYS;
1552 	}
1553 
1554 	return len;
1555 }
1556 
1557 /**
1558  * bnx2i_host_get_param - returns host (adapter) related parameters
1559  * @shost:	scsi host pointer
1560  * @param:	parameter type identifier
1561  * @buf:	buffer pointer
1562  */
bnx2i_host_get_param(struct Scsi_Host * shost,enum iscsi_host_param param,char * buf)1563 static int bnx2i_host_get_param(struct Scsi_Host *shost,
1564 				enum iscsi_host_param param, char *buf)
1565 {
1566 	struct bnx2i_hba *hba = iscsi_host_priv(shost);
1567 	int len = 0;
1568 
1569 	switch (param) {
1570 	case ISCSI_HOST_PARAM_HWADDRESS:
1571 		len = sysfs_format_mac(buf, hba->cnic->mac_addr, 6);
1572 		break;
1573 	case ISCSI_HOST_PARAM_NETDEV_NAME:
1574 		len = sprintf(buf, "%s\n", hba->netdev->name);
1575 		break;
1576 	case ISCSI_HOST_PARAM_IPADDRESS: {
1577 		struct list_head *active_list = &hba->ep_active_list;
1578 
1579 		read_lock_bh(&hba->ep_rdwr_lock);
1580 		if (!list_empty(&hba->ep_active_list)) {
1581 			struct bnx2i_endpoint *bnx2i_ep;
1582 			struct cnic_sock *csk;
1583 
1584 			bnx2i_ep = list_first_entry(active_list,
1585 						    struct bnx2i_endpoint,
1586 						    link);
1587 			csk = bnx2i_ep->cm_sk;
1588 			if (test_bit(SK_F_IPV6, &csk->flags))
1589 				len = sprintf(buf, "%pI6\n", csk->src_ip);
1590 			else
1591 				len = sprintf(buf, "%pI4\n", csk->src_ip);
1592 		}
1593 		read_unlock_bh(&hba->ep_rdwr_lock);
1594 		break;
1595 	}
1596 	default:
1597 		return iscsi_host_get_param(shost, param, buf);
1598 	}
1599 	return len;
1600 }
1601 
1602 /**
1603  * bnx2i_conn_start - completes iscsi connection migration to FFP
1604  * @cls_conn:	pointer to iscsi cls conn
1605  *
1606  * last call in FFP migration to handover iscsi conn to the driver
1607  */
bnx2i_conn_start(struct iscsi_cls_conn * cls_conn)1608 static int bnx2i_conn_start(struct iscsi_cls_conn *cls_conn)
1609 {
1610 	struct iscsi_conn *conn = cls_conn->dd_data;
1611 	struct bnx2i_conn *bnx2i_conn = conn->dd_data;
1612 
1613 	bnx2i_conn->ep->state = EP_STATE_ULP_UPDATE_START;
1614 	bnx2i_update_iscsi_conn(conn);
1615 
1616 	/*
1617 	 * this should normally not sleep for a long time so it should
1618 	 * not disrupt the caller.
1619 	 */
1620 	timer_setup(&bnx2i_conn->ep->ofld_timer, bnx2i_ep_ofld_timer, 0);
1621 	bnx2i_conn->ep->ofld_timer.expires = 1 * HZ + jiffies;
1622 	add_timer(&bnx2i_conn->ep->ofld_timer);
1623 	/* update iSCSI context for this conn, wait for CNIC to complete */
1624 	wait_event_interruptible(bnx2i_conn->ep->ofld_wait,
1625 			bnx2i_conn->ep->state != EP_STATE_ULP_UPDATE_START);
1626 
1627 	if (signal_pending(current))
1628 		flush_signals(current);
1629 	del_timer_sync(&bnx2i_conn->ep->ofld_timer);
1630 
1631 	iscsi_conn_start(cls_conn);
1632 	return 0;
1633 }
1634 
1635 
1636 /**
1637  * bnx2i_conn_get_stats - returns iSCSI stats
1638  * @cls_conn:	pointer to iscsi cls conn
1639  * @stats:	pointer to iscsi statistic struct
1640  */
bnx2i_conn_get_stats(struct iscsi_cls_conn * cls_conn,struct iscsi_stats * stats)1641 static void bnx2i_conn_get_stats(struct iscsi_cls_conn *cls_conn,
1642 				 struct iscsi_stats *stats)
1643 {
1644 	struct iscsi_conn *conn = cls_conn->dd_data;
1645 
1646 	stats->txdata_octets = conn->txdata_octets;
1647 	stats->rxdata_octets = conn->rxdata_octets;
1648 	stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
1649 	stats->dataout_pdus = conn->dataout_pdus_cnt;
1650 	stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
1651 	stats->datain_pdus = conn->datain_pdus_cnt;
1652 	stats->r2t_pdus = conn->r2t_pdus_cnt;
1653 	stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
1654 	stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
1655 	stats->digest_err = 0;
1656 	stats->timeout_err = 0;
1657 	strcpy(stats->custom[0].desc, "eh_abort_cnt");
1658 	stats->custom[0].value = conn->eh_abort_cnt;
1659 	stats->custom_length = 1;
1660 }
1661 
1662 
1663 /**
1664  * bnx2i_check_route - checks if target IP route belongs to one of NX2 devices
1665  * @dst_addr:	target IP address
1666  *
1667  * check if route resolves to BNX2 device
1668  */
bnx2i_check_route(struct sockaddr * dst_addr)1669 static struct bnx2i_hba *bnx2i_check_route(struct sockaddr *dst_addr)
1670 {
1671 	struct sockaddr_in *desti = (struct sockaddr_in *) dst_addr;
1672 	struct bnx2i_hba *hba;
1673 	struct cnic_dev *cnic = NULL;
1674 
1675 	hba = get_adapter_list_head();
1676 	if (hba && hba->cnic)
1677 		cnic = hba->cnic->cm_select_dev(desti, CNIC_ULP_ISCSI);
1678 	if (!cnic) {
1679 		printk(KERN_ALERT "bnx2i: no route,"
1680 		       "can't connect using cnic\n");
1681 		goto no_nx2_route;
1682 	}
1683 	hba = bnx2i_find_hba_for_cnic(cnic);
1684 	if (!hba)
1685 		goto no_nx2_route;
1686 
1687 	if (bnx2i_adapter_ready(hba)) {
1688 		printk(KERN_ALERT "bnx2i: check route, hba not found\n");
1689 		goto no_nx2_route;
1690 	}
1691 	if (hba->netdev->mtu > hba->mtu_supported) {
1692 		printk(KERN_ALERT "bnx2i: %s network i/f mtu is set to %d\n",
1693 				  hba->netdev->name, hba->netdev->mtu);
1694 		printk(KERN_ALERT "bnx2i: iSCSI HBA can support mtu of %d\n",
1695 				  hba->mtu_supported);
1696 		goto no_nx2_route;
1697 	}
1698 	return hba;
1699 no_nx2_route:
1700 	return NULL;
1701 }
1702 
1703 
1704 /**
1705  * bnx2i_tear_down_conn - tear down iscsi/tcp connection and free resources
1706  * @hba:	pointer to adapter instance
1707  * @ep:		endpoint (transport identifier) structure
1708  *
1709  * destroys cm_sock structure and on chip iscsi context
1710  */
bnx2i_tear_down_conn(struct bnx2i_hba * hba,struct bnx2i_endpoint * ep)1711 static int bnx2i_tear_down_conn(struct bnx2i_hba *hba,
1712 				 struct bnx2i_endpoint *ep)
1713 {
1714 	if (test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic) && ep->cm_sk)
1715 		hba->cnic->cm_destroy(ep->cm_sk);
1716 
1717 	if (test_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type) &&
1718 	    ep->state == EP_STATE_DISCONN_TIMEDOUT) {
1719 		if (ep->conn && ep->conn->cls_conn &&
1720 		    ep->conn->cls_conn->dd_data) {
1721 			struct iscsi_conn *conn = ep->conn->cls_conn->dd_data;
1722 
1723 			/* Must suspend all rx queue activity for this ep */
1724 			set_bit(ISCSI_CONN_FLAG_SUSPEND_RX, &conn->flags);
1725 		}
1726 		/* CONN_DISCONNECT timeout may or may not be an issue depending
1727 		 * on what transcribed in TCP layer, different targets behave
1728 		 * differently
1729 		 */
1730 		printk(KERN_ALERT "bnx2i (%s): - WARN - CONN_DISCON timed out, "
1731 				  "please submit GRC Dump, NW/PCIe trace, "
1732 				  "driver msgs to developers for analysis\n",
1733 				  hba->netdev->name);
1734 	}
1735 
1736 	ep->state = EP_STATE_CLEANUP_START;
1737 	timer_setup(&ep->ofld_timer, bnx2i_ep_ofld_timer, 0);
1738 	ep->ofld_timer.expires = hba->conn_ctx_destroy_tmo + jiffies;
1739 	add_timer(&ep->ofld_timer);
1740 
1741 	bnx2i_ep_destroy_list_add(hba, ep);
1742 
1743 	/* destroy iSCSI context, wait for it to complete */
1744 	if (bnx2i_send_conn_destroy(hba, ep))
1745 		ep->state = EP_STATE_CLEANUP_CMPL;
1746 
1747 	wait_event_interruptible(ep->ofld_wait,
1748 				 (ep->state != EP_STATE_CLEANUP_START));
1749 
1750 	if (signal_pending(current))
1751 		flush_signals(current);
1752 	del_timer_sync(&ep->ofld_timer);
1753 
1754 	bnx2i_ep_destroy_list_del(hba, ep);
1755 
1756 	if (ep->state != EP_STATE_CLEANUP_CMPL)
1757 		/* should never happen */
1758 		printk(KERN_ALERT "bnx2i - conn destroy failed\n");
1759 
1760 	return 0;
1761 }
1762 
1763 
1764 /**
1765  * bnx2i_ep_connect - establish TCP connection to target portal
1766  * @shost:		scsi host
1767  * @dst_addr:		target IP address
1768  * @non_blocking:	blocking or non-blocking call
1769  *
1770  * this routine initiates the TCP/IP connection by invoking Option-2 i/f
1771  *	with l5_core and the CNIC. This is a multi-step process of resolving
1772  *	route to target, create a iscsi connection context, handshaking with
1773  *	CNIC module to create/initialize the socket struct and finally
1774  *	sending down option-2 request to complete TCP 3-way handshake
1775  */
bnx2i_ep_connect(struct Scsi_Host * shost,struct sockaddr * dst_addr,int non_blocking)1776 static struct iscsi_endpoint *bnx2i_ep_connect(struct Scsi_Host *shost,
1777 					       struct sockaddr *dst_addr,
1778 					       int non_blocking)
1779 {
1780 	u32 iscsi_cid = BNX2I_CID_RESERVED;
1781 	struct sockaddr_in *desti = (struct sockaddr_in *) dst_addr;
1782 	struct sockaddr_in6 *desti6;
1783 	struct bnx2i_endpoint *bnx2i_ep;
1784 	struct bnx2i_hba *hba;
1785 	struct cnic_dev *cnic;
1786 	struct cnic_sockaddr saddr;
1787 	struct iscsi_endpoint *ep;
1788 	int rc = 0;
1789 
1790 	if (shost) {
1791 		/* driver is given scsi host to work with */
1792 		hba = iscsi_host_priv(shost);
1793 	} else
1794 		/*
1795 		 * check if the given destination can be reached through
1796 		 * a iscsi capable NetXtreme2 device
1797 		 */
1798 		hba = bnx2i_check_route(dst_addr);
1799 
1800 	if (!hba) {
1801 		rc = -EINVAL;
1802 		goto nohba;
1803 	}
1804 	mutex_lock(&hba->net_dev_lock);
1805 
1806 	if (bnx2i_adapter_ready(hba) || !hba->cid_que.cid_free_cnt) {
1807 		rc = -EPERM;
1808 		goto check_busy;
1809 	}
1810 	cnic = hba->cnic;
1811 	ep = bnx2i_alloc_ep(hba);
1812 	if (!ep) {
1813 		rc = -ENOMEM;
1814 		goto check_busy;
1815 	}
1816 	bnx2i_ep = ep->dd_data;
1817 
1818 	atomic_set(&bnx2i_ep->num_active_cmds, 0);
1819 	iscsi_cid = bnx2i_alloc_iscsi_cid(hba);
1820 	if (iscsi_cid == -1) {
1821 		printk(KERN_ALERT "bnx2i (%s): alloc_ep - unable to allocate "
1822 			"iscsi cid\n", hba->netdev->name);
1823 		rc = -ENOMEM;
1824 		bnx2i_free_ep(ep);
1825 		goto check_busy;
1826 	}
1827 	bnx2i_ep->hba_age = hba->age;
1828 
1829 	rc = bnx2i_alloc_qp_resc(hba, bnx2i_ep);
1830 	if (rc != 0) {
1831 		printk(KERN_ALERT "bnx2i (%s): ep_conn - alloc QP resc error"
1832 			"\n", hba->netdev->name);
1833 		rc = -ENOMEM;
1834 		goto qp_resc_err;
1835 	}
1836 
1837 	bnx2i_ep->ep_iscsi_cid = (u16)iscsi_cid;
1838 	bnx2i_ep->state = EP_STATE_OFLD_START;
1839 	bnx2i_ep_ofld_list_add(hba, bnx2i_ep);
1840 
1841 	timer_setup(&bnx2i_ep->ofld_timer, bnx2i_ep_ofld_timer, 0);
1842 	bnx2i_ep->ofld_timer.expires = 2 * HZ + jiffies;
1843 	add_timer(&bnx2i_ep->ofld_timer);
1844 
1845 	if (bnx2i_send_conn_ofld_req(hba, bnx2i_ep)) {
1846 		if (bnx2i_ep->state == EP_STATE_OFLD_FAILED_CID_BUSY) {
1847 			printk(KERN_ALERT "bnx2i (%s): iscsi cid %d is busy\n",
1848 				hba->netdev->name, bnx2i_ep->ep_iscsi_cid);
1849 			rc = -EBUSY;
1850 		} else
1851 			rc = -ENOSPC;
1852 		printk(KERN_ALERT "bnx2i (%s): unable to send conn offld kwqe"
1853 			"\n", hba->netdev->name);
1854 		bnx2i_ep_ofld_list_del(hba, bnx2i_ep);
1855 		goto conn_failed;
1856 	}
1857 
1858 	/* Wait for CNIC hardware to setup conn context and return 'cid' */
1859 	wait_event_interruptible(bnx2i_ep->ofld_wait,
1860 				 bnx2i_ep->state != EP_STATE_OFLD_START);
1861 
1862 	if (signal_pending(current))
1863 		flush_signals(current);
1864 	del_timer_sync(&bnx2i_ep->ofld_timer);
1865 
1866 	bnx2i_ep_ofld_list_del(hba, bnx2i_ep);
1867 
1868 	if (bnx2i_ep->state != EP_STATE_OFLD_COMPL) {
1869 		if (bnx2i_ep->state == EP_STATE_OFLD_FAILED_CID_BUSY) {
1870 			printk(KERN_ALERT "bnx2i (%s): iscsi cid %d is busy\n",
1871 				hba->netdev->name, bnx2i_ep->ep_iscsi_cid);
1872 			rc = -EBUSY;
1873 		} else
1874 			rc = -ENOSPC;
1875 		goto conn_failed;
1876 	}
1877 
1878 	rc = cnic->cm_create(cnic, CNIC_ULP_ISCSI, bnx2i_ep->ep_cid,
1879 			     iscsi_cid, &bnx2i_ep->cm_sk, bnx2i_ep);
1880 	if (rc) {
1881 		rc = -EINVAL;
1882 		/* Need to terminate and cleanup the connection */
1883 		goto release_ep;
1884 	}
1885 
1886 	bnx2i_ep->cm_sk->rcv_buf = 256 * 1024;
1887 	bnx2i_ep->cm_sk->snd_buf = 256 * 1024;
1888 	clear_bit(SK_TCP_TIMESTAMP, &bnx2i_ep->cm_sk->tcp_flags);
1889 
1890 	memset(&saddr, 0, sizeof(saddr));
1891 	if (dst_addr->sa_family == AF_INET) {
1892 		desti = (struct sockaddr_in *) dst_addr;
1893 		saddr.remote.v4 = *desti;
1894 		saddr.local.v4.sin_family = desti->sin_family;
1895 	} else if (dst_addr->sa_family == AF_INET6) {
1896 		desti6 = (struct sockaddr_in6 *) dst_addr;
1897 		saddr.remote.v6 = *desti6;
1898 		saddr.local.v6.sin6_family = desti6->sin6_family;
1899 	}
1900 
1901 	bnx2i_ep->timestamp = jiffies;
1902 	bnx2i_ep->state = EP_STATE_CONNECT_START;
1903 	if (!test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic)) {
1904 		rc = -EINVAL;
1905 		goto conn_failed;
1906 	} else
1907 		rc = cnic->cm_connect(bnx2i_ep->cm_sk, &saddr);
1908 	if (rc)
1909 		goto release_ep;
1910 
1911 	bnx2i_ep_active_list_add(hba, bnx2i_ep);
1912 
1913 	rc = bnx2i_map_ep_dbell_regs(bnx2i_ep);
1914 	if (rc)
1915 		goto del_active_ep;
1916 
1917 	mutex_unlock(&hba->net_dev_lock);
1918 	return ep;
1919 
1920 del_active_ep:
1921 	bnx2i_ep_active_list_del(hba, bnx2i_ep);
1922 release_ep:
1923 	if (bnx2i_tear_down_conn(hba, bnx2i_ep)) {
1924 		mutex_unlock(&hba->net_dev_lock);
1925 		return ERR_PTR(rc);
1926 	}
1927 conn_failed:
1928 	bnx2i_free_qp_resc(hba, bnx2i_ep);
1929 qp_resc_err:
1930 	bnx2i_free_ep(ep);
1931 check_busy:
1932 	mutex_unlock(&hba->net_dev_lock);
1933 nohba:
1934 	return ERR_PTR(rc);
1935 }
1936 
1937 
1938 /**
1939  * bnx2i_ep_poll - polls for TCP connection establishement
1940  * @ep:			TCP connection (endpoint) handle
1941  * @timeout_ms:		timeout value in milli secs
1942  *
1943  * polls for TCP connect request to complete
1944  */
bnx2i_ep_poll(struct iscsi_endpoint * ep,int timeout_ms)1945 static int bnx2i_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
1946 {
1947 	struct bnx2i_endpoint *bnx2i_ep;
1948 	int rc = 0;
1949 
1950 	bnx2i_ep = ep->dd_data;
1951 	if ((bnx2i_ep->state == EP_STATE_IDLE) ||
1952 	    (bnx2i_ep->state == EP_STATE_CONNECT_FAILED) ||
1953 	    (bnx2i_ep->state == EP_STATE_OFLD_FAILED))
1954 		return -1;
1955 	if (bnx2i_ep->state == EP_STATE_CONNECT_COMPL)
1956 		return 1;
1957 
1958 	rc = wait_event_interruptible_timeout(bnx2i_ep->ofld_wait,
1959 					      ((bnx2i_ep->state ==
1960 						EP_STATE_OFLD_FAILED) ||
1961 					       (bnx2i_ep->state ==
1962 						EP_STATE_CONNECT_FAILED) ||
1963 					       (bnx2i_ep->state ==
1964 						EP_STATE_CONNECT_COMPL)),
1965 					      msecs_to_jiffies(timeout_ms));
1966 	if (bnx2i_ep->state == EP_STATE_OFLD_FAILED)
1967 		rc = -1;
1968 
1969 	if (rc > 0)
1970 		return 1;
1971 	else if (!rc)
1972 		return 0;	/* timeout */
1973 	else
1974 		return rc;
1975 }
1976 
1977 
1978 /**
1979  * bnx2i_ep_tcp_conn_active - check EP state transition
1980  * @bnx2i_ep:		endpoint pointer
1981  *
1982  * check if underlying TCP connection is active
1983  */
bnx2i_ep_tcp_conn_active(struct bnx2i_endpoint * bnx2i_ep)1984 static int bnx2i_ep_tcp_conn_active(struct bnx2i_endpoint *bnx2i_ep)
1985 {
1986 	int ret;
1987 	int cnic_dev_10g = 0;
1988 
1989 	if (test_bit(BNX2I_NX2_DEV_57710, &bnx2i_ep->hba->cnic_dev_type))
1990 		cnic_dev_10g = 1;
1991 
1992 	switch (bnx2i_ep->state) {
1993 	case EP_STATE_CLEANUP_FAILED:
1994 	case EP_STATE_OFLD_FAILED:
1995 	case EP_STATE_DISCONN_TIMEDOUT:
1996 		ret = 0;
1997 		break;
1998 	case EP_STATE_CONNECT_START:
1999 	case EP_STATE_CONNECT_FAILED:
2000 	case EP_STATE_CONNECT_COMPL:
2001 	case EP_STATE_ULP_UPDATE_START:
2002 	case EP_STATE_ULP_UPDATE_COMPL:
2003 	case EP_STATE_TCP_FIN_RCVD:
2004 	case EP_STATE_LOGOUT_SENT:
2005 	case EP_STATE_LOGOUT_RESP_RCVD:
2006 	case EP_STATE_ULP_UPDATE_FAILED:
2007 		ret = 1;
2008 		break;
2009 	case EP_STATE_TCP_RST_RCVD:
2010 		if (cnic_dev_10g)
2011 			ret = 0;
2012 		else
2013 			ret = 1;
2014 		break;
2015 	default:
2016 		ret = 0;
2017 	}
2018 
2019 	return ret;
2020 }
2021 
2022 
2023 /**
2024  * bnx2i_hw_ep_disconnect - executes TCP connection teardown process in the hw
2025  * @bnx2i_ep:		TCP connection (bnx2i endpoint) handle
2026  *
2027  * executes  TCP connection teardown process
2028  */
bnx2i_hw_ep_disconnect(struct bnx2i_endpoint * bnx2i_ep)2029 int bnx2i_hw_ep_disconnect(struct bnx2i_endpoint *bnx2i_ep)
2030 {
2031 	struct bnx2i_hba *hba = bnx2i_ep->hba;
2032 	struct cnic_dev *cnic;
2033 	struct iscsi_session *session = NULL;
2034 	struct iscsi_conn *conn = NULL;
2035 	int ret = 0;
2036 	int close = 0;
2037 	int close_ret = 0;
2038 
2039 	if (!hba)
2040 		return 0;
2041 
2042 	cnic = hba->cnic;
2043 	if (!cnic)
2044 		return 0;
2045 
2046 	if (bnx2i_ep->state == EP_STATE_IDLE ||
2047 	    bnx2i_ep->state == EP_STATE_DISCONN_TIMEDOUT)
2048 		return 0;
2049 
2050 	if (!bnx2i_ep_tcp_conn_active(bnx2i_ep))
2051 		goto destroy_conn;
2052 
2053 	if (bnx2i_ep->conn) {
2054 		conn = bnx2i_ep->conn->cls_conn->dd_data;
2055 		session = conn->session;
2056 	}
2057 
2058 	timer_setup(&bnx2i_ep->ofld_timer, bnx2i_ep_ofld_timer, 0);
2059 	bnx2i_ep->ofld_timer.expires = hba->conn_teardown_tmo + jiffies;
2060 	add_timer(&bnx2i_ep->ofld_timer);
2061 
2062 	if (!test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic))
2063 		goto out;
2064 
2065 	if (session) {
2066 		spin_lock_bh(&session->frwd_lock);
2067 		if (bnx2i_ep->state != EP_STATE_TCP_FIN_RCVD) {
2068 			if (session->state == ISCSI_STATE_LOGGING_OUT) {
2069 				if (bnx2i_ep->state == EP_STATE_LOGOUT_SENT) {
2070 					/* Logout sent, but no resp */
2071 					printk(KERN_ALERT "bnx2i (%s): WARNING"
2072 						" logout response was not "
2073 						"received!\n",
2074 						bnx2i_ep->hba->netdev->name);
2075 				} else if (bnx2i_ep->state ==
2076 					   EP_STATE_LOGOUT_RESP_RCVD)
2077 					close = 1;
2078 			}
2079 		} else
2080 			close = 1;
2081 
2082 		spin_unlock_bh(&session->frwd_lock);
2083 	}
2084 
2085 	bnx2i_ep->state = EP_STATE_DISCONN_START;
2086 
2087 	if (close)
2088 		close_ret = cnic->cm_close(bnx2i_ep->cm_sk);
2089 	else
2090 		close_ret = cnic->cm_abort(bnx2i_ep->cm_sk);
2091 
2092 	if (close_ret)
2093 		printk(KERN_ALERT "bnx2i (%s): close/abort(%d) returned %d\n",
2094 			bnx2i_ep->hba->netdev->name, close, close_ret);
2095 	else
2096 		/* wait for option-2 conn teardown */
2097 		wait_event_interruptible(bnx2i_ep->ofld_wait,
2098 				((bnx2i_ep->state != EP_STATE_DISCONN_START)
2099 				&& (bnx2i_ep->state != EP_STATE_TCP_FIN_RCVD)));
2100 
2101 	if (signal_pending(current))
2102 		flush_signals(current);
2103 	del_timer_sync(&bnx2i_ep->ofld_timer);
2104 
2105 destroy_conn:
2106 	bnx2i_ep_active_list_del(hba, bnx2i_ep);
2107 	if (bnx2i_tear_down_conn(hba, bnx2i_ep))
2108 		return -EINVAL;
2109 out:
2110 	bnx2i_ep->state = EP_STATE_IDLE;
2111 	return ret;
2112 }
2113 
2114 
2115 /**
2116  * bnx2i_ep_disconnect - executes TCP connection teardown process
2117  * @ep:		TCP connection (iscsi endpoint) handle
2118  *
2119  * executes  TCP connection teardown process
2120  */
bnx2i_ep_disconnect(struct iscsi_endpoint * ep)2121 static void bnx2i_ep_disconnect(struct iscsi_endpoint *ep)
2122 {
2123 	struct bnx2i_endpoint *bnx2i_ep;
2124 	struct bnx2i_conn *bnx2i_conn = NULL;
2125 	struct bnx2i_hba *hba;
2126 
2127 	bnx2i_ep = ep->dd_data;
2128 
2129 	/* driver should not attempt connection cleanup until TCP_CONNECT
2130 	 * completes either successfully or fails. Timeout is 9-secs, so
2131 	 * wait for it to complete
2132 	 */
2133 	while ((bnx2i_ep->state == EP_STATE_CONNECT_START) &&
2134 		!time_after(jiffies, bnx2i_ep->timestamp + (12 * HZ)))
2135 		msleep(250);
2136 
2137 	if (bnx2i_ep->conn)
2138 		bnx2i_conn = bnx2i_ep->conn;
2139 	hba = bnx2i_ep->hba;
2140 
2141 	mutex_lock(&hba->net_dev_lock);
2142 
2143 	if (bnx2i_ep->state == EP_STATE_DISCONN_TIMEDOUT)
2144 		goto out;
2145 
2146 	if (bnx2i_ep->state == EP_STATE_IDLE)
2147 		goto free_resc;
2148 
2149 	if (!test_bit(ADAPTER_STATE_UP, &hba->adapter_state) ||
2150 	    (bnx2i_ep->hba_age != hba->age)) {
2151 		bnx2i_ep_active_list_del(hba, bnx2i_ep);
2152 		goto free_resc;
2153 	}
2154 
2155 	/* Do all chip cleanup here */
2156 	if (bnx2i_hw_ep_disconnect(bnx2i_ep)) {
2157 		mutex_unlock(&hba->net_dev_lock);
2158 		return;
2159 	}
2160 free_resc:
2161 	bnx2i_free_qp_resc(hba, bnx2i_ep);
2162 
2163 	if (bnx2i_conn)
2164 		bnx2i_conn->ep = NULL;
2165 
2166 	bnx2i_free_ep(ep);
2167 out:
2168 	mutex_unlock(&hba->net_dev_lock);
2169 
2170 	wake_up_interruptible(&hba->eh_wait);
2171 }
2172 
2173 
2174 /**
2175  * bnx2i_nl_set_path - ISCSI_UEVENT_PATH_UPDATE user message handler
2176  * @shost:	scsi host pointer
2177  * @params:	pointer to buffer containing iscsi path message
2178  */
bnx2i_nl_set_path(struct Scsi_Host * shost,struct iscsi_path * params)2179 static int bnx2i_nl_set_path(struct Scsi_Host *shost, struct iscsi_path *params)
2180 {
2181 	struct bnx2i_hba *hba = iscsi_host_priv(shost);
2182 	char *buf = (char *) params;
2183 	u16 len = sizeof(*params);
2184 
2185 	/* handled by cnic driver */
2186 	hba->cnic->iscsi_nl_msg_recv(hba->cnic, ISCSI_UEVENT_PATH_UPDATE, buf,
2187 				     len);
2188 
2189 	return 0;
2190 }
2191 
bnx2i_attr_is_visible(int param_type,int param)2192 static umode_t bnx2i_attr_is_visible(int param_type, int param)
2193 {
2194 	switch (param_type) {
2195 	case ISCSI_HOST_PARAM:
2196 		switch (param) {
2197 		case ISCSI_HOST_PARAM_NETDEV_NAME:
2198 		case ISCSI_HOST_PARAM_HWADDRESS:
2199 		case ISCSI_HOST_PARAM_IPADDRESS:
2200 			return S_IRUGO;
2201 		default:
2202 			return 0;
2203 		}
2204 	case ISCSI_PARAM:
2205 		switch (param) {
2206 		case ISCSI_PARAM_MAX_RECV_DLENGTH:
2207 		case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2208 		case ISCSI_PARAM_HDRDGST_EN:
2209 		case ISCSI_PARAM_DATADGST_EN:
2210 		case ISCSI_PARAM_CONN_ADDRESS:
2211 		case ISCSI_PARAM_CONN_PORT:
2212 		case ISCSI_PARAM_EXP_STATSN:
2213 		case ISCSI_PARAM_PERSISTENT_ADDRESS:
2214 		case ISCSI_PARAM_PERSISTENT_PORT:
2215 		case ISCSI_PARAM_PING_TMO:
2216 		case ISCSI_PARAM_RECV_TMO:
2217 		case ISCSI_PARAM_INITIAL_R2T_EN:
2218 		case ISCSI_PARAM_MAX_R2T:
2219 		case ISCSI_PARAM_IMM_DATA_EN:
2220 		case ISCSI_PARAM_FIRST_BURST:
2221 		case ISCSI_PARAM_MAX_BURST:
2222 		case ISCSI_PARAM_PDU_INORDER_EN:
2223 		case ISCSI_PARAM_DATASEQ_INORDER_EN:
2224 		case ISCSI_PARAM_ERL:
2225 		case ISCSI_PARAM_TARGET_NAME:
2226 		case ISCSI_PARAM_TPGT:
2227 		case ISCSI_PARAM_USERNAME:
2228 		case ISCSI_PARAM_PASSWORD:
2229 		case ISCSI_PARAM_USERNAME_IN:
2230 		case ISCSI_PARAM_PASSWORD_IN:
2231 		case ISCSI_PARAM_FAST_ABORT:
2232 		case ISCSI_PARAM_ABORT_TMO:
2233 		case ISCSI_PARAM_LU_RESET_TMO:
2234 		case ISCSI_PARAM_TGT_RESET_TMO:
2235 		case ISCSI_PARAM_IFACE_NAME:
2236 		case ISCSI_PARAM_INITIATOR_NAME:
2237 		case ISCSI_PARAM_BOOT_ROOT:
2238 		case ISCSI_PARAM_BOOT_NIC:
2239 		case ISCSI_PARAM_BOOT_TARGET:
2240 			return S_IRUGO;
2241 		default:
2242 			return 0;
2243 		}
2244 	}
2245 
2246 	return 0;
2247 }
2248 
2249 /*
2250  * 'Scsi_Host_Template' structure and 'iscsi_tranport' structure template
2251  * used while registering with the scsi host and iSCSI transport module.
2252  */
2253 static const struct scsi_host_template bnx2i_host_template = {
2254 	.module			= THIS_MODULE,
2255 	.name			= "QLogic Offload iSCSI Initiator",
2256 	.proc_name		= "bnx2i",
2257 	.queuecommand		= iscsi_queuecommand,
2258 	.eh_timed_out		= iscsi_eh_cmd_timed_out,
2259 	.eh_abort_handler	= iscsi_eh_abort,
2260 	.eh_device_reset_handler = iscsi_eh_device_reset,
2261 	.eh_target_reset_handler = iscsi_eh_recover_target,
2262 	.change_queue_depth	= scsi_change_queue_depth,
2263 	.target_alloc		= iscsi_target_alloc,
2264 	.can_queue		= 2048,
2265 	.max_sectors		= 127,
2266 	.cmd_per_lun		= 128,
2267 	.this_id		= -1,
2268 	.sg_tablesize		= ISCSI_MAX_BDS_PER_CMD,
2269 	.shost_groups		= bnx2i_dev_groups,
2270 	.track_queue_depth	= 1,
2271 	.cmd_size		= sizeof(struct iscsi_cmd),
2272 };
2273 
2274 struct iscsi_transport bnx2i_iscsi_transport = {
2275 	.owner			= THIS_MODULE,
2276 	.name			= "bnx2i",
2277 	.caps			= CAP_RECOVERY_L0 | CAP_HDRDGST |
2278 				  CAP_MULTI_R2T | CAP_DATADGST |
2279 				  CAP_DATA_PATH_OFFLOAD |
2280 				  CAP_TEXT_NEGO,
2281 	.create_session		= bnx2i_session_create,
2282 	.destroy_session	= bnx2i_session_destroy,
2283 	.create_conn		= bnx2i_conn_create,
2284 	.bind_conn		= bnx2i_conn_bind,
2285 	.unbind_conn		= iscsi_conn_unbind,
2286 	.destroy_conn		= bnx2i_conn_destroy,
2287 	.attr_is_visible	= bnx2i_attr_is_visible,
2288 	.set_param		= iscsi_set_param,
2289 	.get_conn_param		= iscsi_conn_get_param,
2290 	.get_session_param	= iscsi_session_get_param,
2291 	.get_host_param		= bnx2i_host_get_param,
2292 	.start_conn		= bnx2i_conn_start,
2293 	.stop_conn		= iscsi_conn_stop,
2294 	.send_pdu		= iscsi_conn_send_pdu,
2295 	.xmit_task		= bnx2i_task_xmit,
2296 	.get_stats		= bnx2i_conn_get_stats,
2297 	/* TCP connect - disconnect - option-2 interface calls */
2298 	.get_ep_param		= bnx2i_ep_get_param,
2299 	.ep_connect		= bnx2i_ep_connect,
2300 	.ep_poll		= bnx2i_ep_poll,
2301 	.ep_disconnect		= bnx2i_ep_disconnect,
2302 	.set_path		= bnx2i_nl_set_path,
2303 	/* Error recovery timeout call */
2304 	.session_recovery_timedout = iscsi_session_recovery_timedout,
2305 	.cleanup_task		= bnx2i_cleanup_task,
2306 };
2307