1 /* cxgb3i_iscsi.c: Chelsio S3xx iSCSI driver.
2 *
3 * Copyright (c) 2008 Chelsio Communications, Inc.
4 * Copyright (c) 2008 Mike Christie
5 * Copyright (c) 2008 Red Hat, Inc. All rights reserved.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation.
10 *
11 * Written by: Karen Xie (kxie@chelsio.com)
12 */
13
14 #include <linux/inet.h>
15 #include <linux/crypto.h>
16 #include <net/tcp.h>
17 #include <scsi/scsi_cmnd.h>
18 #include <scsi/scsi_device.h>
19 #include <scsi/scsi_eh.h>
20 #include <scsi/scsi_host.h>
21 #include <scsi/scsi.h>
22 #include <scsi/iscsi_proto.h>
23 #include <scsi/libiscsi.h>
24 #include <scsi/scsi_transport_iscsi.h>
25
26 #include "cxgb3i.h"
27 #include "cxgb3i_pdu.h"
28
29 #ifdef __DEBUG_CXGB3I_TAG__
30 #define cxgb3i_tag_debug cxgb3i_log_debug
31 #else
32 #define cxgb3i_tag_debug(fmt...)
33 #endif
34
35 #ifdef __DEBUG_CXGB3I_API__
36 #define cxgb3i_api_debug cxgb3i_log_debug
37 #else
38 #define cxgb3i_api_debug(fmt...)
39 #endif
40
41 /*
42 * align pdu size to multiple of 512 for better performance
43 */
44 #define align_pdu_size(n) do { n = (n) & (~511); } while (0)
45
46 static struct scsi_transport_template *cxgb3i_scsi_transport;
47 static struct scsi_host_template cxgb3i_host_template;
48 static struct iscsi_transport cxgb3i_iscsi_transport;
49 static unsigned char sw_tag_idx_bits;
50 static unsigned char sw_tag_age_bits;
51
52 static LIST_HEAD(cxgb3i_snic_list);
53 static DEFINE_RWLOCK(cxgb3i_snic_rwlock);
54
55 /**
56 * cxgb3i_adapter_add - init a s3 adapter structure and any h/w settings
57 * @t3dev: t3cdev adapter
58 * return the resulting cxgb3i_adapter struct
59 */
cxgb3i_adapter_add(struct t3cdev * t3dev)60 struct cxgb3i_adapter *cxgb3i_adapter_add(struct t3cdev *t3dev)
61 {
62 struct cxgb3i_adapter *snic;
63 struct adapter *adapter = tdev2adap(t3dev);
64 int i;
65
66 snic = kzalloc(sizeof(*snic), GFP_KERNEL);
67 if (!snic) {
68 cxgb3i_api_debug("cxgb3 %s, OOM.\n", t3dev->name);
69 return NULL;
70 }
71 spin_lock_init(&snic->lock);
72
73 snic->tdev = t3dev;
74 snic->pdev = adapter->pdev;
75 snic->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
76
77 if (cxgb3i_adapter_ddp_init(t3dev, &snic->tag_format,
78 &snic->tx_max_size,
79 &snic->rx_max_size) < 0)
80 goto free_snic;
81
82 for_each_port(adapter, i) {
83 snic->hba[i] = cxgb3i_hba_host_add(snic, adapter->port[i]);
84 if (!snic->hba[i])
85 goto ulp_cleanup;
86 }
87 snic->hba_cnt = adapter->params.nports;
88
89 /* add to the list */
90 write_lock(&cxgb3i_snic_rwlock);
91 list_add_tail(&snic->list_head, &cxgb3i_snic_list);
92 write_unlock(&cxgb3i_snic_rwlock);
93
94 return snic;
95
96 ulp_cleanup:
97 cxgb3i_adapter_ddp_cleanup(t3dev);
98 free_snic:
99 kfree(snic);
100 return NULL;
101 }
102
103 /**
104 * cxgb3i_adapter_remove - release all the resources held and cleanup any
105 * h/w settings
106 * @t3dev: t3cdev adapter
107 */
cxgb3i_adapter_remove(struct t3cdev * t3dev)108 void cxgb3i_adapter_remove(struct t3cdev *t3dev)
109 {
110 int i;
111 struct cxgb3i_adapter *snic;
112
113 /* remove from the list */
114 write_lock(&cxgb3i_snic_rwlock);
115 list_for_each_entry(snic, &cxgb3i_snic_list, list_head) {
116 if (snic->tdev == t3dev) {
117 list_del(&snic->list_head);
118 break;
119 }
120 }
121 write_unlock(&cxgb3i_snic_rwlock);
122
123 if (snic) {
124 for (i = 0; i < snic->hba_cnt; i++) {
125 if (snic->hba[i]) {
126 cxgb3i_hba_host_remove(snic->hba[i]);
127 snic->hba[i] = NULL;
128 }
129 }
130
131 /* release ddp resources */
132 cxgb3i_adapter_ddp_cleanup(snic->tdev);
133 kfree(snic);
134 }
135 }
136
137 /**
138 * cxgb3i_hba_find_by_netdev - find the cxgb3i_hba structure with a given
139 * net_device
140 * @t3dev: t3cdev adapter
141 */
cxgb3i_hba_find_by_netdev(struct net_device * ndev)142 struct cxgb3i_hba *cxgb3i_hba_find_by_netdev(struct net_device *ndev)
143 {
144 struct cxgb3i_adapter *snic;
145 int i;
146
147 read_lock(&cxgb3i_snic_rwlock);
148 list_for_each_entry(snic, &cxgb3i_snic_list, list_head) {
149 for (i = 0; i < snic->hba_cnt; i++) {
150 if (snic->hba[i]->ndev == ndev) {
151 read_unlock(&cxgb3i_snic_rwlock);
152 return snic->hba[i];
153 }
154 }
155 }
156 read_unlock(&cxgb3i_snic_rwlock);
157 return NULL;
158 }
159
160 /**
161 * cxgb3i_hba_host_add - register a new host with scsi/iscsi
162 * @snic: the cxgb3i adapter
163 * @ndev: associated net_device
164 */
cxgb3i_hba_host_add(struct cxgb3i_adapter * snic,struct net_device * ndev)165 struct cxgb3i_hba *cxgb3i_hba_host_add(struct cxgb3i_adapter *snic,
166 struct net_device *ndev)
167 {
168 struct cxgb3i_hba *hba;
169 struct Scsi_Host *shost;
170 int err;
171
172 shost = iscsi_host_alloc(&cxgb3i_host_template,
173 sizeof(struct cxgb3i_hba),
174 CXGB3I_SCSI_QDEPTH_DFLT);
175 if (!shost) {
176 cxgb3i_log_info("iscsi_host_alloc failed.\n");
177 return NULL;
178 }
179
180 shost->transportt = cxgb3i_scsi_transport;
181 shost->max_lun = CXGB3I_MAX_LUN;
182 shost->max_id = CXGB3I_MAX_TARGET;
183 shost->max_channel = 0;
184 shost->max_cmd_len = 16;
185
186 hba = iscsi_host_priv(shost);
187 hba->snic = snic;
188 hba->ndev = ndev;
189 hba->shost = shost;
190
191 pci_dev_get(snic->pdev);
192 err = iscsi_host_add(shost, &snic->pdev->dev);
193 if (err) {
194 cxgb3i_log_info("iscsi_host_add failed.\n");
195 goto pci_dev_put;
196 }
197
198 cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n",
199 shost, hba, shost->host_no);
200
201 return hba;
202
203 pci_dev_put:
204 pci_dev_put(snic->pdev);
205 scsi_host_put(shost);
206 return NULL;
207 }
208
209 /**
210 * cxgb3i_hba_host_remove - de-register the host with scsi/iscsi
211 * @hba: the cxgb3i hba
212 */
cxgb3i_hba_host_remove(struct cxgb3i_hba * hba)213 void cxgb3i_hba_host_remove(struct cxgb3i_hba *hba)
214 {
215 cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n",
216 hba->shost, hba, hba->shost->host_no);
217 iscsi_host_remove(hba->shost);
218 pci_dev_put(hba->snic->pdev);
219 iscsi_host_free(hba->shost);
220 }
221
222 /**
223 * cxgb3i_ep_connect - establish TCP connection to target portal
224 * @dst_addr: target IP address
225 * @non_blocking: blocking or non-blocking call
226 *
227 * Initiates a TCP/IP connection to the dst_addr
228 */
cxgb3i_ep_connect(struct sockaddr * dst_addr,int non_blocking)229 static struct iscsi_endpoint *cxgb3i_ep_connect(struct sockaddr *dst_addr,
230 int non_blocking)
231 {
232 struct iscsi_endpoint *ep;
233 struct cxgb3i_endpoint *cep;
234 struct cxgb3i_hba *hba;
235 struct s3_conn *c3cn = NULL;
236 int err = 0;
237
238 c3cn = cxgb3i_c3cn_create();
239 if (!c3cn) {
240 cxgb3i_log_info("ep connect OOM.\n");
241 err = -ENOMEM;
242 goto release_conn;
243 }
244
245 err = cxgb3i_c3cn_connect(c3cn, (struct sockaddr_in *)dst_addr);
246 if (err < 0) {
247 cxgb3i_log_info("ep connect failed.\n");
248 goto release_conn;
249 }
250 hba = cxgb3i_hba_find_by_netdev(c3cn->dst_cache->dev);
251 if (!hba) {
252 err = -ENOSPC;
253 cxgb3i_log_info("NOT going through cxgbi device.\n");
254 goto release_conn;
255 }
256 if (c3cn_is_closing(c3cn)) {
257 err = -ENOSPC;
258 cxgb3i_log_info("ep connect unable to connect.\n");
259 goto release_conn;
260 }
261
262 ep = iscsi_create_endpoint(sizeof(*cep));
263 if (!ep) {
264 err = -ENOMEM;
265 cxgb3i_log_info("iscsi alloc ep, OOM.\n");
266 goto release_conn;
267 }
268 cep = ep->dd_data;
269 cep->c3cn = c3cn;
270 cep->hba = hba;
271
272 cxgb3i_api_debug("ep 0x%p, 0x%p, c3cn 0x%p, hba 0x%p.\n",
273 ep, cep, c3cn, hba);
274 return ep;
275
276 release_conn:
277 cxgb3i_api_debug("conn 0x%p failed, release.\n", c3cn);
278 if (c3cn)
279 cxgb3i_c3cn_release(c3cn);
280 return ERR_PTR(err);
281 }
282
283 /**
284 * cxgb3i_ep_poll - polls for TCP connection establishement
285 * @ep: TCP connection (endpoint) handle
286 * @timeout_ms: timeout value in milli secs
287 *
288 * polls for TCP connect request to complete
289 */
cxgb3i_ep_poll(struct iscsi_endpoint * ep,int timeout_ms)290 static int cxgb3i_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
291 {
292 struct cxgb3i_endpoint *cep = ep->dd_data;
293 struct s3_conn *c3cn = cep->c3cn;
294
295 if (!c3cn_is_established(c3cn))
296 return 0;
297 cxgb3i_api_debug("ep 0x%p, c3cn 0x%p established.\n", ep, c3cn);
298 return 1;
299 }
300
301 /**
302 * cxgb3i_ep_disconnect - teardown TCP connection
303 * @ep: TCP connection (endpoint) handle
304 *
305 * teardown TCP connection
306 */
cxgb3i_ep_disconnect(struct iscsi_endpoint * ep)307 static void cxgb3i_ep_disconnect(struct iscsi_endpoint *ep)
308 {
309 struct cxgb3i_endpoint *cep = ep->dd_data;
310 struct cxgb3i_conn *cconn = cep->cconn;
311
312 cxgb3i_api_debug("ep 0x%p, cep 0x%p.\n", ep, cep);
313
314 if (cconn && cconn->conn) {
315 /*
316 * stop the xmit path so the xmit_pdu function is
317 * not being called
318 */
319 iscsi_suspend_tx(cconn->conn);
320
321 write_lock_bh(&cep->c3cn->callback_lock);
322 cep->c3cn->user_data = NULL;
323 cconn->cep = NULL;
324 write_unlock_bh(&cep->c3cn->callback_lock);
325 }
326
327 cxgb3i_api_debug("ep 0x%p, cep 0x%p, release c3cn 0x%p.\n",
328 ep, cep, cep->c3cn);
329 cxgb3i_c3cn_release(cep->c3cn);
330 iscsi_destroy_endpoint(ep);
331 }
332
333 /**
334 * cxgb3i_session_create - create a new iscsi session
335 * @cmds_max: max # of commands
336 * @qdepth: scsi queue depth
337 * @initial_cmdsn: initial iscsi CMDSN for this session
338 * @host_no: pointer to return host no
339 *
340 * Creates a new iSCSI session
341 */
342 static struct iscsi_cls_session *
cxgb3i_session_create(struct iscsi_endpoint * ep,u16 cmds_max,u16 qdepth,u32 initial_cmdsn,u32 * host_no)343 cxgb3i_session_create(struct iscsi_endpoint *ep, u16 cmds_max, u16 qdepth,
344 u32 initial_cmdsn, u32 *host_no)
345 {
346 struct cxgb3i_endpoint *cep;
347 struct cxgb3i_hba *hba;
348 struct Scsi_Host *shost;
349 struct iscsi_cls_session *cls_session;
350 struct iscsi_session *session;
351
352 if (!ep) {
353 cxgb3i_log_error("%s, missing endpoint.\n", __func__);
354 return NULL;
355 }
356
357 cep = ep->dd_data;
358 hba = cep->hba;
359 shost = hba->shost;
360 cxgb3i_api_debug("ep 0x%p, cep 0x%p, hba 0x%p.\n", ep, cep, hba);
361 BUG_ON(hba != iscsi_host_priv(shost));
362
363 *host_no = shost->host_no;
364
365 cls_session = iscsi_session_setup(&cxgb3i_iscsi_transport, shost,
366 cmds_max,
367 sizeof(struct iscsi_tcp_task) +
368 sizeof(struct cxgb3i_task_data),
369 initial_cmdsn, ISCSI_MAX_TARGET);
370 if (!cls_session)
371 return NULL;
372 session = cls_session->dd_data;
373 if (iscsi_tcp_r2tpool_alloc(session))
374 goto remove_session;
375
376 return cls_session;
377
378 remove_session:
379 iscsi_session_teardown(cls_session);
380 return NULL;
381 }
382
383 /**
384 * cxgb3i_session_destroy - destroys iscsi session
385 * @cls_session: pointer to iscsi cls session
386 *
387 * Destroys an iSCSI session instance and releases its all resources held
388 */
cxgb3i_session_destroy(struct iscsi_cls_session * cls_session)389 static void cxgb3i_session_destroy(struct iscsi_cls_session *cls_session)
390 {
391 cxgb3i_api_debug("sess 0x%p.\n", cls_session);
392 iscsi_tcp_r2tpool_free(cls_session->dd_data);
393 iscsi_session_teardown(cls_session);
394 }
395
396 /**
397 * cxgb3i_conn_max_xmit_dlength -- check the max. xmit pdu segment size,
398 * reduce it to be within the hardware limit if needed
399 * @conn: iscsi connection
400 */
cxgb3i_conn_max_xmit_dlength(struct iscsi_conn * conn)401 static inline int cxgb3i_conn_max_xmit_dlength(struct iscsi_conn *conn)
402
403 {
404 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
405 struct cxgb3i_conn *cconn = tcp_conn->dd_data;
406 unsigned int max = max(512 * MAX_SKB_FRAGS, SKB_TX_HEADROOM);
407
408 max = min(cconn->hba->snic->tx_max_size, max);
409 if (conn->max_xmit_dlength)
410 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
411 else
412 conn->max_xmit_dlength = max;
413 align_pdu_size(conn->max_xmit_dlength);
414 cxgb3i_api_debug("conn 0x%p, max xmit %u.\n",
415 conn, conn->max_xmit_dlength);
416 return 0;
417 }
418
419 /**
420 * cxgb3i_conn_max_recv_dlength -- check the max. recv pdu segment size against
421 * the hardware limit
422 * @conn: iscsi connection
423 * return 0 if the value is valid, < 0 otherwise.
424 */
cxgb3i_conn_max_recv_dlength(struct iscsi_conn * conn)425 static inline int cxgb3i_conn_max_recv_dlength(struct iscsi_conn *conn)
426 {
427 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
428 struct cxgb3i_conn *cconn = tcp_conn->dd_data;
429 unsigned int max = cconn->hba->snic->rx_max_size;
430
431 align_pdu_size(max);
432 if (conn->max_recv_dlength) {
433 if (conn->max_recv_dlength > max) {
434 cxgb3i_log_error("MaxRecvDataSegmentLength %u too big."
435 " Need to be <= %u.\n",
436 conn->max_recv_dlength, max);
437 return -EINVAL;
438 }
439 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
440 align_pdu_size(conn->max_recv_dlength);
441 } else
442 conn->max_recv_dlength = max;
443 cxgb3i_api_debug("conn 0x%p, max recv %u.\n",
444 conn, conn->max_recv_dlength);
445 return 0;
446 }
447
448 /**
449 * cxgb3i_conn_create - create iscsi connection instance
450 * @cls_session: pointer to iscsi cls session
451 * @cid: iscsi cid
452 *
453 * Creates a new iSCSI connection instance for a given session
454 */
cxgb3i_conn_create(struct iscsi_cls_session * cls_session,u32 cid)455 static struct iscsi_cls_conn *cxgb3i_conn_create(struct iscsi_cls_session
456 *cls_session, u32 cid)
457 {
458 struct iscsi_cls_conn *cls_conn;
459 struct iscsi_conn *conn;
460 struct iscsi_tcp_conn *tcp_conn;
461 struct cxgb3i_conn *cconn;
462
463 cxgb3i_api_debug("sess 0x%p, cid %u.\n", cls_session, cid);
464
465 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
466 if (!cls_conn)
467 return NULL;
468 conn = cls_conn->dd_data;
469 tcp_conn = conn->dd_data;
470 cconn = tcp_conn->dd_data;
471
472 cconn->conn = conn;
473 return cls_conn;
474 }
475
476 /**
477 * cxgb3i_conn_bind - binds iscsi sess, conn and endpoint together
478 * @cls_session: pointer to iscsi cls session
479 * @cls_conn: pointer to iscsi cls conn
480 * @transport_eph: 64-bit EP handle
481 * @is_leading: leading connection on this session?
482 *
483 * Binds together an iSCSI session, an iSCSI connection and a
484 * TCP connection. This routine returns error code if the TCP
485 * connection does not belong on the device iSCSI sess/conn is bound
486 */
487
cxgb3i_conn_bind(struct iscsi_cls_session * cls_session,struct iscsi_cls_conn * cls_conn,u64 transport_eph,int is_leading)488 static int cxgb3i_conn_bind(struct iscsi_cls_session *cls_session,
489 struct iscsi_cls_conn *cls_conn,
490 u64 transport_eph, int is_leading)
491 {
492 struct iscsi_conn *conn = cls_conn->dd_data;
493 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
494 struct cxgb3i_conn *cconn = tcp_conn->dd_data;
495 struct cxgb3i_adapter *snic;
496 struct iscsi_endpoint *ep;
497 struct cxgb3i_endpoint *cep;
498 struct s3_conn *c3cn;
499 int err;
500
501 ep = iscsi_lookup_endpoint(transport_eph);
502 if (!ep)
503 return -EINVAL;
504
505 /* setup ddp pagesize */
506 cep = ep->dd_data;
507 c3cn = cep->c3cn;
508 snic = cep->hba->snic;
509 err = cxgb3i_setup_conn_host_pagesize(snic->tdev, c3cn->tid, 0);
510 if (err < 0)
511 return err;
512
513 cxgb3i_api_debug("ep 0x%p, cls sess 0x%p, cls conn 0x%p.\n",
514 ep, cls_session, cls_conn);
515
516 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
517 if (err)
518 return -EINVAL;
519
520 /* calculate the tag idx bits needed for this conn based on cmds_max */
521 cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
522 cxgb3i_api_debug("session cmds_max 0x%x, bits %u.\n",
523 conn->session->cmds_max, cconn->task_idx_bits);
524
525 read_lock(&c3cn->callback_lock);
526 c3cn->user_data = conn;
527 cconn->hba = cep->hba;
528 cconn->cep = cep;
529 cep->cconn = cconn;
530 read_unlock(&c3cn->callback_lock);
531
532 cxgb3i_conn_max_xmit_dlength(conn);
533 cxgb3i_conn_max_recv_dlength(conn);
534
535 spin_lock_bh(&conn->session->lock);
536 sprintf(conn->portal_address, NIPQUAD_FMT,
537 NIPQUAD(c3cn->daddr.sin_addr.s_addr));
538 conn->portal_port = ntohs(c3cn->daddr.sin_port);
539 spin_unlock_bh(&conn->session->lock);
540
541 /* init recv engine */
542 iscsi_tcp_hdr_recv_prep(tcp_conn);
543
544 return 0;
545 }
546
547 /**
548 * cxgb3i_conn_get_param - return iscsi connection parameter to caller
549 * @cls_conn: pointer to iscsi cls conn
550 * @param: parameter type identifier
551 * @buf: buffer pointer
552 *
553 * returns iSCSI connection parameters
554 */
cxgb3i_conn_get_param(struct iscsi_cls_conn * cls_conn,enum iscsi_param param,char * buf)555 static int cxgb3i_conn_get_param(struct iscsi_cls_conn *cls_conn,
556 enum iscsi_param param, char *buf)
557 {
558 struct iscsi_conn *conn = cls_conn->dd_data;
559 int len;
560
561 cxgb3i_api_debug("cls_conn 0x%p, param %d.\n", cls_conn, param);
562
563 switch (param) {
564 case ISCSI_PARAM_CONN_PORT:
565 spin_lock_bh(&conn->session->lock);
566 len = sprintf(buf, "%hu\n", conn->portal_port);
567 spin_unlock_bh(&conn->session->lock);
568 break;
569 case ISCSI_PARAM_CONN_ADDRESS:
570 spin_lock_bh(&conn->session->lock);
571 len = sprintf(buf, "%s\n", conn->portal_address);
572 spin_unlock_bh(&conn->session->lock);
573 break;
574 default:
575 return iscsi_conn_get_param(cls_conn, param, buf);
576 }
577
578 return len;
579 }
580
581 /**
582 * cxgb3i_conn_set_param - set iscsi connection parameter
583 * @cls_conn: pointer to iscsi cls conn
584 * @param: parameter type identifier
585 * @buf: buffer pointer
586 * @buflen: buffer length
587 *
588 * set iSCSI connection parameters
589 */
cxgb3i_conn_set_param(struct iscsi_cls_conn * cls_conn,enum iscsi_param param,char * buf,int buflen)590 static int cxgb3i_conn_set_param(struct iscsi_cls_conn *cls_conn,
591 enum iscsi_param param, char *buf, int buflen)
592 {
593 struct iscsi_conn *conn = cls_conn->dd_data;
594 struct iscsi_session *session = conn->session;
595 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
596 struct cxgb3i_conn *cconn = tcp_conn->dd_data;
597 struct cxgb3i_adapter *snic = cconn->hba->snic;
598 struct s3_conn *c3cn = cconn->cep->c3cn;
599 int value, err = 0;
600
601 switch (param) {
602 case ISCSI_PARAM_HDRDGST_EN:
603 err = iscsi_set_param(cls_conn, param, buf, buflen);
604 if (!err && conn->hdrdgst_en)
605 err = cxgb3i_setup_conn_digest(snic->tdev, c3cn->tid,
606 conn->hdrdgst_en,
607 conn->datadgst_en, 0);
608 break;
609 case ISCSI_PARAM_DATADGST_EN:
610 err = iscsi_set_param(cls_conn, param, buf, buflen);
611 if (!err && conn->datadgst_en)
612 err = cxgb3i_setup_conn_digest(snic->tdev, c3cn->tid,
613 conn->hdrdgst_en,
614 conn->datadgst_en, 0);
615 break;
616 case ISCSI_PARAM_MAX_R2T:
617 sscanf(buf, "%d", &value);
618 if (value <= 0 || !is_power_of_2(value))
619 return -EINVAL;
620 if (session->max_r2t == value)
621 break;
622 iscsi_tcp_r2tpool_free(session);
623 err = iscsi_set_param(cls_conn, param, buf, buflen);
624 if (!err && iscsi_tcp_r2tpool_alloc(session))
625 return -ENOMEM;
626 case ISCSI_PARAM_MAX_RECV_DLENGTH:
627 err = iscsi_set_param(cls_conn, param, buf, buflen);
628 if (!err)
629 err = cxgb3i_conn_max_recv_dlength(conn);
630 break;
631 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
632 err = iscsi_set_param(cls_conn, param, buf, buflen);
633 if (!err)
634 err = cxgb3i_conn_max_xmit_dlength(conn);
635 break;
636 default:
637 return iscsi_set_param(cls_conn, param, buf, buflen);
638 }
639 return err;
640 }
641
642 /**
643 * cxgb3i_host_set_param - configure host (adapter) related parameters
644 * @shost: scsi host pointer
645 * @param: parameter type identifier
646 * @buf: buffer pointer
647 */
cxgb3i_host_set_param(struct Scsi_Host * shost,enum iscsi_host_param param,char * buf,int buflen)648 static int cxgb3i_host_set_param(struct Scsi_Host *shost,
649 enum iscsi_host_param param,
650 char *buf, int buflen)
651 {
652 struct cxgb3i_hba *hba = iscsi_host_priv(shost);
653
654 cxgb3i_api_debug("param %d, buf %s.\n", param, buf);
655
656 switch (param) {
657 case ISCSI_HOST_PARAM_IPADDRESS:
658 {
659 __be32 addr = in_aton(buf);
660 cxgb3i_set_private_ipv4addr(hba->ndev, addr);
661 return 0;
662 }
663 case ISCSI_HOST_PARAM_HWADDRESS:
664 case ISCSI_HOST_PARAM_NETDEV_NAME:
665 /* ignore */
666 return 0;
667 default:
668 return iscsi_host_set_param(shost, param, buf, buflen);
669 }
670 }
671
672 /**
673 * cxgb3i_host_get_param - returns host (adapter) related parameters
674 * @shost: scsi host pointer
675 * @param: parameter type identifier
676 * @buf: buffer pointer
677 */
cxgb3i_host_get_param(struct Scsi_Host * shost,enum iscsi_host_param param,char * buf)678 static int cxgb3i_host_get_param(struct Scsi_Host *shost,
679 enum iscsi_host_param param, char *buf)
680 {
681 struct cxgb3i_hba *hba = iscsi_host_priv(shost);
682 int len = 0;
683
684 cxgb3i_api_debug("hba %s, param %d.\n", hba->ndev->name, param);
685
686 switch (param) {
687 case ISCSI_HOST_PARAM_HWADDRESS:
688 len = sysfs_format_mac(buf, hba->ndev->dev_addr, 6);
689 break;
690 case ISCSI_HOST_PARAM_NETDEV_NAME:
691 len = sprintf(buf, "%s\n", hba->ndev->name);
692 break;
693 case ISCSI_HOST_PARAM_IPADDRESS:
694 {
695 __be32 addr;
696
697 addr = cxgb3i_get_private_ipv4addr(hba->ndev);
698 len = sprintf(buf, NIPQUAD_FMT, NIPQUAD(addr));
699 break;
700 }
701 default:
702 return iscsi_host_get_param(shost, param, buf);
703 }
704 return len;
705 }
706
707 /**
708 * cxgb3i_conn_get_stats - returns iSCSI stats
709 * @cls_conn: pointer to iscsi cls conn
710 * @stats: pointer to iscsi statistic struct
711 */
cxgb3i_conn_get_stats(struct iscsi_cls_conn * cls_conn,struct iscsi_stats * stats)712 static void cxgb3i_conn_get_stats(struct iscsi_cls_conn *cls_conn,
713 struct iscsi_stats *stats)
714 {
715 struct iscsi_conn *conn = cls_conn->dd_data;
716
717 stats->txdata_octets = conn->txdata_octets;
718 stats->rxdata_octets = conn->rxdata_octets;
719 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
720 stats->dataout_pdus = conn->dataout_pdus_cnt;
721 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
722 stats->datain_pdus = conn->datain_pdus_cnt;
723 stats->r2t_pdus = conn->r2t_pdus_cnt;
724 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
725 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
726 stats->digest_err = 0;
727 stats->timeout_err = 0;
728 stats->custom_length = 1;
729 strcpy(stats->custom[0].desc, "eh_abort_cnt");
730 stats->custom[0].value = conn->eh_abort_cnt;
731 }
732
733 /**
734 * cxgb3i_parse_itt - get the idx and age bits from a given tag
735 * @conn: iscsi connection
736 * @itt: itt tag
737 * @idx: task index, filled in by this function
738 * @age: session age, filled in by this function
739 */
cxgb3i_parse_itt(struct iscsi_conn * conn,itt_t itt,int * idx,int * age)740 static void cxgb3i_parse_itt(struct iscsi_conn *conn, itt_t itt,
741 int *idx, int *age)
742 {
743 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
744 struct cxgb3i_conn *cconn = tcp_conn->dd_data;
745 struct cxgb3i_adapter *snic = cconn->hba->snic;
746 u32 tag = ntohl((__force u32) itt);
747 u32 sw_bits;
748
749 sw_bits = cxgb3i_tag_nonrsvd_bits(&snic->tag_format, tag);
750 if (idx)
751 *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
752 if (age)
753 *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
754
755 cxgb3i_tag_debug("parse tag 0x%x/0x%x, sw 0x%x, itt 0x%x, age 0x%x.\n",
756 tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
757 age ? *age : 0xFF);
758 }
759
760 /**
761 * cxgb3i_reserve_itt - generate tag for a give task
762 * Try to set up ddp for a scsi read task.
763 * @task: iscsi task
764 * @hdr_itt: tag, filled in by this function
765 */
cxgb3i_reserve_itt(struct iscsi_task * task,itt_t * hdr_itt)766 int cxgb3i_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
767 {
768 struct scsi_cmnd *sc = task->sc;
769 struct iscsi_conn *conn = task->conn;
770 struct iscsi_session *sess = conn->session;
771 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
772 struct cxgb3i_conn *cconn = tcp_conn->dd_data;
773 struct cxgb3i_adapter *snic = cconn->hba->snic;
774 struct cxgb3i_tag_format *tformat = &snic->tag_format;
775 u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
776 u32 tag;
777 int err = -EINVAL;
778
779 if (sc &&
780 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
781 cxgb3i_sw_tag_usable(tformat, sw_tag)) {
782 struct s3_conn *c3cn = cconn->cep->c3cn;
783 struct cxgb3i_gather_list *gl;
784
785 gl = cxgb3i_ddp_make_gl(scsi_in(sc)->length,
786 scsi_in(sc)->table.sgl,
787 scsi_in(sc)->table.nents,
788 snic->pdev,
789 GFP_ATOMIC);
790 if (gl) {
791 tag = sw_tag;
792 err = cxgb3i_ddp_tag_reserve(snic->tdev, c3cn->tid,
793 tformat, &tag,
794 gl, GFP_ATOMIC);
795 if (err < 0)
796 cxgb3i_ddp_release_gl(gl, snic->pdev);
797 }
798 }
799
800 if (err < 0)
801 tag = cxgb3i_set_non_ddp_tag(tformat, sw_tag);
802 /* the itt need to sent in big-endian order */
803 *hdr_itt = (__force itt_t)htonl(tag);
804
805 cxgb3i_tag_debug("new tag 0x%x/0x%x (itt 0x%x, age 0x%x).\n",
806 tag, *hdr_itt, task->itt, sess->age);
807 return 0;
808 }
809
810 /**
811 * cxgb3i_release_itt - release the tag for a given task
812 * if the tag is a ddp tag, release the ddp setup
813 * @task: iscsi task
814 * @hdr_itt: tag
815 */
cxgb3i_release_itt(struct iscsi_task * task,itt_t hdr_itt)816 void cxgb3i_release_itt(struct iscsi_task *task, itt_t hdr_itt)
817 {
818 struct scsi_cmnd *sc = task->sc;
819 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
820 struct cxgb3i_conn *cconn = tcp_conn->dd_data;
821 struct cxgb3i_adapter *snic = cconn->hba->snic;
822 struct cxgb3i_tag_format *tformat = &snic->tag_format;
823 u32 tag = ntohl((__force u32)hdr_itt);
824
825 cxgb3i_tag_debug("release tag 0x%x.\n", tag);
826
827 if (sc &&
828 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
829 cxgb3i_is_ddp_tag(tformat, tag))
830 cxgb3i_ddp_tag_release(snic->tdev, tag);
831 }
832
833 /**
834 * cxgb3i_host_template -- Scsi_Host_Template structure
835 * used when registering with the scsi mid layer
836 */
837 static struct scsi_host_template cxgb3i_host_template = {
838 .module = THIS_MODULE,
839 .name = "Chelsio S3xx iSCSI Initiator",
840 .proc_name = "cxgb3i",
841 .queuecommand = iscsi_queuecommand,
842 .change_queue_depth = iscsi_change_queue_depth,
843 .can_queue = CXGB3I_SCSI_QDEPTH_DFLT - 1,
844 .sg_tablesize = SG_ALL,
845 .max_sectors = 0xFFFF,
846 .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN,
847 .eh_abort_handler = iscsi_eh_abort,
848 .eh_device_reset_handler = iscsi_eh_device_reset,
849 .eh_target_reset_handler = iscsi_eh_target_reset,
850 .use_clustering = DISABLE_CLUSTERING,
851 .this_id = -1,
852 };
853
854 static struct iscsi_transport cxgb3i_iscsi_transport = {
855 .owner = THIS_MODULE,
856 .name = "cxgb3i",
857 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
858 | CAP_DATADGST | CAP_DIGEST_OFFLOAD |
859 CAP_PADDING_OFFLOAD,
860 .param_mask = ISCSI_MAX_RECV_DLENGTH |
861 ISCSI_MAX_XMIT_DLENGTH |
862 ISCSI_HDRDGST_EN |
863 ISCSI_DATADGST_EN |
864 ISCSI_INITIAL_R2T_EN |
865 ISCSI_MAX_R2T |
866 ISCSI_IMM_DATA_EN |
867 ISCSI_FIRST_BURST |
868 ISCSI_MAX_BURST |
869 ISCSI_PDU_INORDER_EN |
870 ISCSI_DATASEQ_INORDER_EN |
871 ISCSI_ERL |
872 ISCSI_CONN_PORT |
873 ISCSI_CONN_ADDRESS |
874 ISCSI_EXP_STATSN |
875 ISCSI_PERSISTENT_PORT |
876 ISCSI_PERSISTENT_ADDRESS |
877 ISCSI_TARGET_NAME | ISCSI_TPGT |
878 ISCSI_USERNAME | ISCSI_PASSWORD |
879 ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
880 ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
881 ISCSI_LU_RESET_TMO |
882 ISCSI_PING_TMO | ISCSI_RECV_TMO |
883 ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
884 .host_param_mask = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
885 ISCSI_HOST_INITIATOR_NAME | ISCSI_HOST_NETDEV_NAME,
886 .get_host_param = cxgb3i_host_get_param,
887 .set_host_param = cxgb3i_host_set_param,
888 /* session management */
889 .create_session = cxgb3i_session_create,
890 .destroy_session = cxgb3i_session_destroy,
891 .get_session_param = iscsi_session_get_param,
892 /* connection management */
893 .create_conn = cxgb3i_conn_create,
894 .bind_conn = cxgb3i_conn_bind,
895 .destroy_conn = iscsi_tcp_conn_teardown,
896 .start_conn = iscsi_conn_start,
897 .stop_conn = iscsi_conn_stop,
898 .get_conn_param = cxgb3i_conn_get_param,
899 .set_param = cxgb3i_conn_set_param,
900 .get_stats = cxgb3i_conn_get_stats,
901 /* pdu xmit req. from user space */
902 .send_pdu = iscsi_conn_send_pdu,
903 /* task */
904 .init_task = iscsi_tcp_task_init,
905 .xmit_task = iscsi_tcp_task_xmit,
906 .cleanup_task = cxgb3i_conn_cleanup_task,
907
908 /* pdu */
909 .alloc_pdu = cxgb3i_conn_alloc_pdu,
910 .init_pdu = cxgb3i_conn_init_pdu,
911 .xmit_pdu = cxgb3i_conn_xmit_pdu,
912 .parse_pdu_itt = cxgb3i_parse_itt,
913
914 /* TCP connect/disconnect */
915 .ep_connect = cxgb3i_ep_connect,
916 .ep_poll = cxgb3i_ep_poll,
917 .ep_disconnect = cxgb3i_ep_disconnect,
918 /* Error recovery timeout call */
919 .session_recovery_timedout = iscsi_session_recovery_timedout,
920 };
921
cxgb3i_iscsi_init(void)922 int cxgb3i_iscsi_init(void)
923 {
924 sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
925 sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
926 cxgb3i_log_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
927 ISCSI_ITT_MASK, sw_tag_idx_bits,
928 ISCSI_AGE_MASK, sw_tag_age_bits);
929
930 cxgb3i_scsi_transport =
931 iscsi_register_transport(&cxgb3i_iscsi_transport);
932 if (!cxgb3i_scsi_transport) {
933 cxgb3i_log_error("Could not register cxgb3i transport.\n");
934 return -ENODEV;
935 }
936 cxgb3i_api_debug("cxgb3i transport 0x%p.\n", cxgb3i_scsi_transport);
937 return 0;
938 }
939
cxgb3i_iscsi_cleanup(void)940 void cxgb3i_iscsi_cleanup(void)
941 {
942 if (cxgb3i_scsi_transport) {
943 cxgb3i_api_debug("cxgb3i transport 0x%p.\n",
944 cxgb3i_scsi_transport);
945 iscsi_unregister_transport(&cxgb3i_iscsi_transport);
946 }
947 }
948