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[SCSI] iscsi lib: remove qdepth param from iscsi host allocation
[deliverable/linux.git] / drivers / scsi / cxgb3i / cxgb3i_iscsi.c
CommitLineData
c3673464
KX		 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
46static struct scsi_transport_template *cxgb3i_scsi_transport;
47static struct scsi_host_template cxgb3i_host_template;
48static struct iscsi_transport cxgb3i_iscsi_transport;
49static unsigned char sw_tag_idx_bits;
50static unsigned char sw_tag_age_bits;
51
52static LIST_HEAD(cxgb3i_snic_list);
53static 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 */
60struct 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
96ulp_cleanup:
97 cxgb3i_adapter_ddp_cleanup(t3dev);
98free_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 */
108void 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 */
142struct 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 */
165struct 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,
4d108350 173 sizeof(struct cxgb3i_hba), 1);
c3673464
KX		 174 if (!shost) {
175 cxgb3i_log_info("iscsi_host_alloc failed.\n");
176 return NULL;
177 }
178
179 shost->transportt = cxgb3i_scsi_transport;
180 shost->max_lun = CXGB3I_MAX_LUN;
181 shost->max_id = CXGB3I_MAX_TARGET;
182 shost->max_channel = 0;
183 shost->max_cmd_len = 16;
184
185 hba = iscsi_host_priv(shost);
186 hba->snic = snic;
187 hba->ndev = ndev;
188 hba->shost = shost;
189
190 pci_dev_get(snic->pdev);
191 err = iscsi_host_add(shost, &snic->pdev->dev);
192 if (err) {
193 cxgb3i_log_info("iscsi_host_add failed.\n");
194 goto pci_dev_put;
195 }
196
197 cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n",
198 shost, hba, shost->host_no);
199
200 return hba;
201
202pci_dev_put:
203 pci_dev_put(snic->pdev);
204 scsi_host_put(shost);
205 return NULL;
206}
207
208/**
209 * cxgb3i_hba_host_remove - de-register the host with scsi/iscsi
210 * @hba: the cxgb3i hba
211 */
212void cxgb3i_hba_host_remove(struct cxgb3i_hba *hba)
213{
214 cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n",
215 hba->shost, hba, hba->shost->host_no);
216 iscsi_host_remove(hba->shost);
217 pci_dev_put(hba->snic->pdev);
218 iscsi_host_free(hba->shost);
219}
220
221/**
222 * cxgb3i_ep_connect - establish TCP connection to target portal
223 * @dst_addr: target IP address
224 * @non_blocking: blocking or non-blocking call
225 *
226 * Initiates a TCP/IP connection to the dst_addr
227 */
228static struct iscsi_endpoint *cxgb3i_ep_connect(struct sockaddr *dst_addr,
229 int non_blocking)
230{
231 struct iscsi_endpoint *ep;
232 struct cxgb3i_endpoint *cep;
233 struct cxgb3i_hba *hba;
234 struct s3_conn *c3cn = NULL;
235 int err = 0;
236
237 c3cn = cxgb3i_c3cn_create();
238 if (!c3cn) {
239 cxgb3i_log_info("ep connect OOM.\n");
240 err = -ENOMEM;
241 goto release_conn;
242 }
243
244 err = cxgb3i_c3cn_connect(c3cn, (struct sockaddr_in *)dst_addr);
245 if (err < 0) {
246 cxgb3i_log_info("ep connect failed.\n");
247 goto release_conn;
248 }
249 hba = cxgb3i_hba_find_by_netdev(c3cn->dst_cache->dev);
250 if (!hba) {
251 err = -ENOSPC;
252 cxgb3i_log_info("NOT going through cxgbi device.\n");
253 goto release_conn;
254 }
255 if (c3cn_is_closing(c3cn)) {
256 err = -ENOSPC;
257 cxgb3i_log_info("ep connect unable to connect.\n");
258 goto release_conn;
259 }
260
261 ep = iscsi_create_endpoint(sizeof(*cep));
262 if (!ep) {
263 err = -ENOMEM;
264 cxgb3i_log_info("iscsi alloc ep, OOM.\n");
265 goto release_conn;
266 }
267 cep = ep->dd_data;
268 cep->c3cn = c3cn;
269 cep->hba = hba;
270
271 cxgb3i_api_debug("ep 0x%p, 0x%p, c3cn 0x%p, hba 0x%p.\n",
272 ep, cep, c3cn, hba);
273 return ep;
274
275release_conn:
276 cxgb3i_api_debug("conn 0x%p failed, release.\n", c3cn);
277 if (c3cn)
278 cxgb3i_c3cn_release(c3cn);
279 return ERR_PTR(err);
280}
281
282/**
283 * cxgb3i_ep_poll - polls for TCP connection establishement
284 * @ep: TCP connection (endpoint) handle
285 * @timeout_ms: timeout value in milli secs
286 *
287 * polls for TCP connect request to complete
288 */
289static int cxgb3i_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
290{
291 struct cxgb3i_endpoint *cep = ep->dd_data;
292 struct s3_conn *c3cn = cep->c3cn;
293
294 if (!c3cn_is_established(c3cn))
295 return 0;
296 cxgb3i_api_debug("ep 0x%p, c3cn 0x%p established.\n", ep, c3cn);
297 return 1;
298}
299
300/**
301 * cxgb3i_ep_disconnect - teardown TCP connection
302 * @ep: TCP connection (endpoint) handle
303 *
304 * teardown TCP connection
305 */
306static void cxgb3i_ep_disconnect(struct iscsi_endpoint *ep)
307{
308 struct cxgb3i_endpoint *cep = ep->dd_data;
309 struct cxgb3i_conn *cconn = cep->cconn;
310
311 cxgb3i_api_debug("ep 0x%p, cep 0x%p.\n", ep, cep);
312
313 if (cconn && cconn->conn) {
314 /*
315 * stop the xmit path so the xmit_pdu function is
316 * not being called
317 */
318 iscsi_suspend_tx(cconn->conn);
319
320 write_lock_bh(&cep->c3cn->callback_lock);
321 cep->c3cn->user_data = NULL;
322 cconn->cep = NULL;
323 write_unlock_bh(&cep->c3cn->callback_lock);
324 }
325
326 cxgb3i_api_debug("ep 0x%p, cep 0x%p, release c3cn 0x%p.\n",
327 ep, cep, cep->c3cn);
328 cxgb3i_c3cn_release(cep->c3cn);
329 iscsi_destroy_endpoint(ep);
330}
331
332/**
333 * cxgb3i_session_create - create a new iscsi session
334 * @cmds_max: max # of commands
335 * @qdepth: scsi queue depth
336 * @initial_cmdsn: initial iscsi CMDSN for this session
337 * @host_no: pointer to return host no
338 *
339 * Creates a new iSCSI session
340 */
341static struct iscsi_cls_session *
342cxgb3i_session_create(struct iscsi_endpoint *ep, u16 cmds_max, u16 qdepth,
343 u32 initial_cmdsn, u32 *host_no)
344{
345 struct cxgb3i_endpoint *cep;
346 struct cxgb3i_hba *hba;
347 struct Scsi_Host *shost;
348 struct iscsi_cls_session *cls_session;
349 struct iscsi_session *session;
350
351 if (!ep) {
352 cxgb3i_log_error("%s, missing endpoint.\n", __func__);
353 return NULL;
354 }
355
356 cep = ep->dd_data;
357 hba = cep->hba;
358 shost = hba->shost;
359 cxgb3i_api_debug("ep 0x%p, cep 0x%p, hba 0x%p.\n", ep, cep, hba);
360 BUG_ON(hba != iscsi_host_priv(shost));
361
362 *host_no = shost->host_no;
363
364 cls_session = iscsi_session_setup(&cxgb3i_iscsi_transport, shost,
365 cmds_max,
949847d1
KX		 366 sizeof(struct iscsi_tcp_task) +
367 sizeof(struct cxgb3i_task_data),
c3673464
KX		 368 initial_cmdsn, ISCSI_MAX_TARGET);
369 if (!cls_session)
370 return NULL;
371 session = cls_session->dd_data;
372 if (iscsi_tcp_r2tpool_alloc(session))
373 goto remove_session;
374
375 return cls_session;
376
377remove_session:
378 iscsi_session_teardown(cls_session);
379 return NULL;
380}
381
382/**
383 * cxgb3i_session_destroy - destroys iscsi session
384 * @cls_session: pointer to iscsi cls session
385 *
386 * Destroys an iSCSI session instance and releases its all resources held
387 */
388static void cxgb3i_session_destroy(struct iscsi_cls_session *cls_session)
389{
390 cxgb3i_api_debug("sess 0x%p.\n", cls_session);
391 iscsi_tcp_r2tpool_free(cls_session->dd_data);
392 iscsi_session_teardown(cls_session);
393}
394
395/**
396 * cxgb3i_conn_max_xmit_dlength -- check the max. xmit pdu segment size,
397 * reduce it to be within the hardware limit if needed
398 * @conn: iscsi connection
399 */
400static inline int cxgb3i_conn_max_xmit_dlength(struct iscsi_conn *conn)
401
402{
403 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
404 struct cxgb3i_conn *cconn = tcp_conn->dd_data;
f62d0896 405 unsigned int max = max(512 * MAX_SKB_FRAGS, SKB_TX_HEADROOM);
c3673464 406
f62d0896 407 max = min(cconn->hba->snic->tx_max_size, max);
c3673464 408 if (conn->max_xmit_dlength)
f62d0896 409 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
c3673464
KX		 410 else
411 conn->max_xmit_dlength = max;
412 align_pdu_size(conn->max_xmit_dlength);
f62d0896 413 cxgb3i_api_debug("conn 0x%p, max xmit %u.\n",
c3673464
KX		 414 conn, conn->max_xmit_dlength);
415 return 0;
416}
417
418/**
419 * cxgb3i_conn_max_recv_dlength -- check the max. recv pdu segment size against
420 * the hardware limit
421 * @conn: iscsi connection
422 * return 0 if the value is valid, < 0 otherwise.
423 */
424static inline int cxgb3i_conn_max_recv_dlength(struct iscsi_conn *conn)
425{
426 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
427 struct cxgb3i_conn *cconn = tcp_conn->dd_data;
f62d0896 428 unsigned int max = cconn->hba->snic->rx_max_size;
c3673464
KX		 429
430 align_pdu_size(max);
431 if (conn->max_recv_dlength) {
432 if (conn->max_recv_dlength > max) {
433 cxgb3i_log_error("MaxRecvDataSegmentLength %u too big."
434 " Need to be <= %u.\n",
435 conn->max_recv_dlength, max);
436 return -EINVAL;
437 }
f62d0896 438 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
c3673464
KX		 439 align_pdu_size(conn->max_recv_dlength);
440 } else
441 conn->max_recv_dlength = max;
442 cxgb3i_api_debug("conn 0x%p, max recv %u.\n",
443 conn, conn->max_recv_dlength);
444 return 0;
445}
446
447/**
448 * cxgb3i_conn_create - create iscsi connection instance
449 * @cls_session: pointer to iscsi cls session
450 * @cid: iscsi cid
451 *
452 * Creates a new iSCSI connection instance for a given session
453 */
454static struct iscsi_cls_conn *cxgb3i_conn_create(struct iscsi_cls_session
455 *cls_session, u32 cid)
456{
457 struct iscsi_cls_conn *cls_conn;
458 struct iscsi_conn *conn;
459 struct iscsi_tcp_conn *tcp_conn;
460 struct cxgb3i_conn *cconn;
461
462 cxgb3i_api_debug("sess 0x%p, cid %u.\n", cls_session, cid);
463
464 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
465 if (!cls_conn)
466 return NULL;
467 conn = cls_conn->dd_data;
468 tcp_conn = conn->dd_data;
469 cconn = tcp_conn->dd_data;
470
471 cconn->conn = conn;
472 return cls_conn;
473}
474
475/**
476 * cxgb3i_conn_bind - binds iscsi sess, conn and endpoint together
477 * @cls_session: pointer to iscsi cls session
478 * @cls_conn: pointer to iscsi cls conn
479 * @transport_eph: 64-bit EP handle
480 * @is_leading: leading connection on this session?
481 *
482 * Binds together an iSCSI session, an iSCSI connection and a
483 * TCP connection. This routine returns error code if the TCP
484 * connection does not belong on the device iSCSI sess/conn is bound
485 */
486
487static int cxgb3i_conn_bind(struct iscsi_cls_session *cls_session,
488 struct iscsi_cls_conn *cls_conn,
489 u64 transport_eph, int is_leading)
490{
491 struct iscsi_conn *conn = cls_conn->dd_data;
492 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
493 struct cxgb3i_conn *cconn = tcp_conn->dd_data;
494 struct cxgb3i_adapter *snic;
495 struct iscsi_endpoint *ep;
496 struct cxgb3i_endpoint *cep;
497 struct s3_conn *c3cn;
498 int err;
499
500 ep = iscsi_lookup_endpoint(transport_eph);
501 if (!ep)
502 return -EINVAL;
503
504 /* setup ddp pagesize */
505 cep = ep->dd_data;
506 c3cn = cep->c3cn;
507 snic = cep->hba->snic;
508 err = cxgb3i_setup_conn_host_pagesize(snic->tdev, c3cn->tid, 0);
509 if (err < 0)
510 return err;
511
512 cxgb3i_api_debug("ep 0x%p, cls sess 0x%p, cls conn 0x%p.\n",
513 ep, cls_session, cls_conn);
514
515 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
516 if (err)
517 return -EINVAL;
518
519 /* calculate the tag idx bits needed for this conn based on cmds_max */
520 cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
521 cxgb3i_api_debug("session cmds_max 0x%x, bits %u.\n",
522 conn->session->cmds_max, cconn->task_idx_bits);
523
524 read_lock(&c3cn->callback_lock);
525 c3cn->user_data = conn;
526 cconn->hba = cep->hba;
527 cconn->cep = cep;
528 cep->cconn = cconn;
529 read_unlock(&c3cn->callback_lock);
530
531 cxgb3i_conn_max_xmit_dlength(conn);
532 cxgb3i_conn_max_recv_dlength(conn);
533
534 spin_lock_bh(&conn->session->lock);
535 sprintf(conn->portal_address, NIPQUAD_FMT,
536 NIPQUAD(c3cn->daddr.sin_addr.s_addr));
537 conn->portal_port = ntohs(c3cn->daddr.sin_port);
538 spin_unlock_bh(&conn->session->lock);
539
540 /* init recv engine */
541 iscsi_tcp_hdr_recv_prep(tcp_conn);
542
543 return 0;
544}
545
546/**
547 * cxgb3i_conn_get_param - return iscsi connection parameter to caller
548 * @cls_conn: pointer to iscsi cls conn
549 * @param: parameter type identifier
550 * @buf: buffer pointer
551 *
552 * returns iSCSI connection parameters
553 */
554static int cxgb3i_conn_get_param(struct iscsi_cls_conn *cls_conn,
555 enum iscsi_param param, char *buf)
556{
557 struct iscsi_conn *conn = cls_conn->dd_data;
558 int len;
559
560 cxgb3i_api_debug("cls_conn 0x%p, param %d.\n", cls_conn, param);
561
562 switch (param) {
563 case ISCSI_PARAM_CONN_PORT:
564 spin_lock_bh(&conn->session->lock);
565 len = sprintf(buf, "%hu\n", conn->portal_port);
566 spin_unlock_bh(&conn->session->lock);
567 break;
568 case ISCSI_PARAM_CONN_ADDRESS:
569 spin_lock_bh(&conn->session->lock);
570 len = sprintf(buf, "%s\n", conn->portal_address);
571 spin_unlock_bh(&conn->session->lock);
572 break;
573 default:
574 return iscsi_conn_get_param(cls_conn, param, buf);
575 }
576
577 return len;
578}
579
580/**
581 * cxgb3i_conn_set_param - set iscsi connection parameter
582 * @cls_conn: pointer to iscsi cls conn
583 * @param: parameter type identifier
584 * @buf: buffer pointer
585 * @buflen: buffer length
586 *
587 * set iSCSI connection parameters
588 */
589static int cxgb3i_conn_set_param(struct iscsi_cls_conn *cls_conn,
590 enum iscsi_param param, char *buf, int buflen)
591{
592 struct iscsi_conn *conn = cls_conn->dd_data;
593 struct iscsi_session *session = conn->session;
594 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
595 struct cxgb3i_conn *cconn = tcp_conn->dd_data;
596 struct cxgb3i_adapter *snic = cconn->hba->snic;
597 struct s3_conn *c3cn = cconn->cep->c3cn;
598 int value, err = 0;
599
600 switch (param) {
601 case ISCSI_PARAM_HDRDGST_EN:
602 err = iscsi_set_param(cls_conn, param, buf, buflen);
603 if (!err && conn->hdrdgst_en)
604 err = cxgb3i_setup_conn_digest(snic->tdev, c3cn->tid,
605 conn->hdrdgst_en,
606 conn->datadgst_en, 0);
607 break;
608 case ISCSI_PARAM_DATADGST_EN:
609 err = iscsi_set_param(cls_conn, param, buf, buflen);
610 if (!err && conn->datadgst_en)
611 err = cxgb3i_setup_conn_digest(snic->tdev, c3cn->tid,
612 conn->hdrdgst_en,
613 conn->datadgst_en, 0);
614 break;
615 case ISCSI_PARAM_MAX_R2T:
616 sscanf(buf, "%d", &value);
617 if (value <= 0 || !is_power_of_2(value))
618 return -EINVAL;
619 if (session->max_r2t == value)
620 break;
621 iscsi_tcp_r2tpool_free(session);
622 err = iscsi_set_param(cls_conn, param, buf, buflen);
623 if (!err && iscsi_tcp_r2tpool_alloc(session))
624 return -ENOMEM;
625 case ISCSI_PARAM_MAX_RECV_DLENGTH:
626 err = iscsi_set_param(cls_conn, param, buf, buflen);
627 if (!err)
628 err = cxgb3i_conn_max_recv_dlength(conn);
629 break;
630 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
631 err = iscsi_set_param(cls_conn, param, buf, buflen);
632 if (!err)
633 err = cxgb3i_conn_max_xmit_dlength(conn);
634 break;
635 default:
636 return iscsi_set_param(cls_conn, param, buf, buflen);
637 }
638 return err;
639}
640
641/**
642 * cxgb3i_host_set_param - configure host (adapter) related parameters
643 * @shost: scsi host pointer
644 * @param: parameter type identifier
645 * @buf: buffer pointer
646 */
647static int cxgb3i_host_set_param(struct Scsi_Host *shost,
648 enum iscsi_host_param param,
649 char *buf, int buflen)
650{
651 struct cxgb3i_hba *hba = iscsi_host_priv(shost);
652
653 cxgb3i_api_debug("param %d, buf %s.\n", param, buf);
654
655 switch (param) {
656 case ISCSI_HOST_PARAM_IPADDRESS:
657 {
658 __be32 addr = in_aton(buf);
659 cxgb3i_set_private_ipv4addr(hba->ndev, addr);
660 return 0;
661 }
662 case ISCSI_HOST_PARAM_HWADDRESS:
663 case ISCSI_HOST_PARAM_NETDEV_NAME:
664 /* ignore */
665 return 0;
666 default:
667 return iscsi_host_set_param(shost, param, buf, buflen);
668 }
669}
670
671/**
672 * cxgb3i_host_get_param - returns host (adapter) related parameters
673 * @shost: scsi host pointer
674 * @param: parameter type identifier
675 * @buf: buffer pointer
676 */
677static int cxgb3i_host_get_param(struct Scsi_Host *shost,
678 enum iscsi_host_param param, char *buf)
679{
680 struct cxgb3i_hba *hba = iscsi_host_priv(shost);
681 int len = 0;
682
683 cxgb3i_api_debug("hba %s, param %d.\n", hba->ndev->name, param);
684
685 switch (param) {
686 case ISCSI_HOST_PARAM_HWADDRESS:
687 len = sysfs_format_mac(buf, hba->ndev->dev_addr, 6);
688 break;
689 case ISCSI_HOST_PARAM_NETDEV_NAME:
690 len = sprintf(buf, "%s\n", hba->ndev->name);
691 break;
692 case ISCSI_HOST_PARAM_IPADDRESS:
693 {
694 __be32 addr;
695
696 addr = cxgb3i_get_private_ipv4addr(hba->ndev);
697 len = sprintf(buf, NIPQUAD_FMT, NIPQUAD(addr));
698 break;
699 }
700 default:
701 return iscsi_host_get_param(shost, param, buf);
702 }
703 return len;
704}
705
706/**
707 * cxgb3i_conn_get_stats - returns iSCSI stats
708 * @cls_conn: pointer to iscsi cls conn
709 * @stats: pointer to iscsi statistic struct
710 */
711static void cxgb3i_conn_get_stats(struct iscsi_cls_conn *cls_conn,
712 struct iscsi_stats *stats)
713{
714 struct iscsi_conn *conn = cls_conn->dd_data;
715
716 stats->txdata_octets = conn->txdata_octets;
717 stats->rxdata_octets = conn->rxdata_octets;
718 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
719 stats->dataout_pdus = conn->dataout_pdus_cnt;
720 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
721 stats->datain_pdus = conn->datain_pdus_cnt;
722 stats->r2t_pdus = conn->r2t_pdus_cnt;
723 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
724 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
725 stats->digest_err = 0;
726 stats->timeout_err = 0;
727 stats->custom_length = 1;
728 strcpy(stats->custom[0].desc, "eh_abort_cnt");
729 stats->custom[0].value = conn->eh_abort_cnt;
730}
731
732/**
733 * cxgb3i_parse_itt - get the idx and age bits from a given tag
734 * @conn: iscsi connection
735 * @itt: itt tag
736 * @idx: task index, filled in by this function
737 * @age: session age, filled in by this function
738 */
739static void cxgb3i_parse_itt(struct iscsi_conn *conn, itt_t itt,
740 int *idx, int *age)
741{
742 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
743 struct cxgb3i_conn *cconn = tcp_conn->dd_data;
744 struct cxgb3i_adapter *snic = cconn->hba->snic;
745 u32 tag = ntohl((__force u32) itt);
746 u32 sw_bits;
747
748 sw_bits = cxgb3i_tag_nonrsvd_bits(&snic->tag_format, tag);
749 if (idx)
750 *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
751 if (age)
752 *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
753
754 cxgb3i_tag_debug("parse tag 0x%x/0x%x, sw 0x%x, itt 0x%x, age 0x%x.\n",
755 tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
756 age ? *age : 0xFF);
757}
758
759/**
760 * cxgb3i_reserve_itt - generate tag for a give task
761 * Try to set up ddp for a scsi read task.
762 * @task: iscsi task
763 * @hdr_itt: tag, filled in by this function
764 */
765int cxgb3i_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
766{
767 struct scsi_cmnd *sc = task->sc;
768 struct iscsi_conn *conn = task->conn;
769 struct iscsi_session *sess = conn->session;
770 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
771 struct cxgb3i_conn *cconn = tcp_conn->dd_data;
772 struct cxgb3i_adapter *snic = cconn->hba->snic;
773 struct cxgb3i_tag_format *tformat = &snic->tag_format;
774 u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
775 u32 tag;
776 int err = -EINVAL;
777
778 if (sc &&
779 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
780 cxgb3i_sw_tag_usable(tformat, sw_tag)) {
781 struct s3_conn *c3cn = cconn->cep->c3cn;
782 struct cxgb3i_gather_list *gl;
783
784 gl = cxgb3i_ddp_make_gl(scsi_in(sc)->length,
785 scsi_in(sc)->table.sgl,
786 scsi_in(sc)->table.nents,
787 snic->pdev,
788 GFP_ATOMIC);
789 if (gl) {
790 tag = sw_tag;
791 err = cxgb3i_ddp_tag_reserve(snic->tdev, c3cn->tid,
792 tformat, &tag,
793 gl, GFP_ATOMIC);
794 if (err < 0)
795 cxgb3i_ddp_release_gl(gl, snic->pdev);
796 }
797 }
798
799 if (err < 0)
800 tag = cxgb3i_set_non_ddp_tag(tformat, sw_tag);
801 /* the itt need to sent in big-endian order */
802 *hdr_itt = (__force itt_t)htonl(tag);
803
804 cxgb3i_tag_debug("new tag 0x%x/0x%x (itt 0x%x, age 0x%x).\n",
805 tag, *hdr_itt, task->itt, sess->age);
806 return 0;
807}
808
809/**
810 * cxgb3i_release_itt - release the tag for a given task
811 * if the tag is a ddp tag, release the ddp setup
812 * @task: iscsi task
813 * @hdr_itt: tag
814 */
815void cxgb3i_release_itt(struct iscsi_task *task, itt_t hdr_itt)
816{
817 struct scsi_cmnd *sc = task->sc;
818 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
819 struct cxgb3i_conn *cconn = tcp_conn->dd_data;
820 struct cxgb3i_adapter *snic = cconn->hba->snic;
821 struct cxgb3i_tag_format *tformat = &snic->tag_format;
822 u32 tag = ntohl((__force u32)hdr_itt);
823
824 cxgb3i_tag_debug("release tag 0x%x.\n", tag);
825
826 if (sc &&
827 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
828 cxgb3i_is_ddp_tag(tformat, tag))
829 cxgb3i_ddp_tag_release(snic->tdev, tag);
830}
831
832/**
833 * cxgb3i_host_template -- Scsi_Host_Template structure
834 * used when registering with the scsi mid layer
835 */
836static struct scsi_host_template cxgb3i_host_template = {
837 .module = THIS_MODULE,
838 .name = "Chelsio S3xx iSCSI Initiator",
839 .proc_name = "cxgb3i",
840 .queuecommand = iscsi_queuecommand,
841 .change_queue_depth = iscsi_change_queue_depth,
949847d1 842 .can_queue = CXGB3I_SCSI_QDEPTH_DFLT - 1,
c3673464
KX		 843 .sg_tablesize = SG_ALL,
844 .max_sectors = 0xFFFF,
4d108350 845 .cmd_per_lun = CXGB3I_SCSI_QDEPTH_DFLT,
c3673464
KX		 846 .eh_abort_handler = iscsi_eh_abort,
847 .eh_device_reset_handler = iscsi_eh_device_reset,
848 .eh_target_reset_handler = iscsi_eh_target_reset,
849 .use_clustering = DISABLE_CLUSTERING,
850 .this_id = -1,
851};
852
853static struct iscsi_transport cxgb3i_iscsi_transport = {
854 .owner = THIS_MODULE,
855 .name = "cxgb3i",
856 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
857 | CAP_DATADGST | CAP_DIGEST_OFFLOAD |
858 CAP_PADDING_OFFLOAD,
859 .param_mask = ISCSI_MAX_RECV_DLENGTH |
860 ISCSI_MAX_XMIT_DLENGTH |
861 ISCSI_HDRDGST_EN |
862 ISCSI_DATADGST_EN |
863 ISCSI_INITIAL_R2T_EN |
864 ISCSI_MAX_R2T |
865 ISCSI_IMM_DATA_EN |
866 ISCSI_FIRST_BURST |
867 ISCSI_MAX_BURST |
868 ISCSI_PDU_INORDER_EN |
869 ISCSI_DATASEQ_INORDER_EN |
870 ISCSI_ERL |
871 ISCSI_CONN_PORT |
872 ISCSI_CONN_ADDRESS |
873 ISCSI_EXP_STATSN |
874 ISCSI_PERSISTENT_PORT |
875 ISCSI_PERSISTENT_ADDRESS |
876 ISCSI_TARGET_NAME | ISCSI_TPGT |
877 ISCSI_USERNAME | ISCSI_PASSWORD |
878 ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
879 ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
880 ISCSI_LU_RESET_TMO |
881 ISCSI_PING_TMO | ISCSI_RECV_TMO |
882 ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
883 .host_param_mask = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
884 ISCSI_HOST_INITIATOR_NAME | ISCSI_HOST_NETDEV_NAME,
885 .get_host_param = cxgb3i_host_get_param,
886 .set_host_param = cxgb3i_host_set_param,
887 /* session management */
888 .create_session = cxgb3i_session_create,
889 .destroy_session = cxgb3i_session_destroy,
890 .get_session_param = iscsi_session_get_param,
891 /* connection management */
892 .create_conn = cxgb3i_conn_create,
893 .bind_conn = cxgb3i_conn_bind,
894 .destroy_conn = iscsi_tcp_conn_teardown,
895 .start_conn = iscsi_conn_start,
896 .stop_conn = iscsi_conn_stop,
897 .get_conn_param = cxgb3i_conn_get_param,
898 .set_param = cxgb3i_conn_set_param,
899 .get_stats = cxgb3i_conn_get_stats,
900 /* pdu xmit req. from user space */
901 .send_pdu = iscsi_conn_send_pdu,
902 /* task */
903 .init_task = iscsi_tcp_task_init,
904 .xmit_task = iscsi_tcp_task_xmit,
905 .cleanup_task = cxgb3i_conn_cleanup_task,
906
907 /* pdu */
908 .alloc_pdu = cxgb3i_conn_alloc_pdu,
909 .init_pdu = cxgb3i_conn_init_pdu,
910 .xmit_pdu = cxgb3i_conn_xmit_pdu,
911 .parse_pdu_itt = cxgb3i_parse_itt,
912
913 /* TCP connect/disconnect */
914 .ep_connect = cxgb3i_ep_connect,
915 .ep_poll = cxgb3i_ep_poll,
916 .ep_disconnect = cxgb3i_ep_disconnect,
917 /* Error recovery timeout call */
918 .session_recovery_timedout = iscsi_session_recovery_timedout,
919};
920
921int cxgb3i_iscsi_init(void)
922{
923 sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
924 sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
925 cxgb3i_log_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
926 ISCSI_ITT_MASK, sw_tag_idx_bits,
927 ISCSI_AGE_MASK, sw_tag_age_bits);
928
929 cxgb3i_scsi_transport =
930 iscsi_register_transport(&cxgb3i_iscsi_transport);
931 if (!cxgb3i_scsi_transport) {
932 cxgb3i_log_error("Could not register cxgb3i transport.\n");
933 return -ENODEV;
934 }
935 cxgb3i_api_debug("cxgb3i transport 0x%p.\n", cxgb3i_scsi_transport);
936 return 0;
937}
938
939void cxgb3i_iscsi_cleanup(void)
940{
941 if (cxgb3i_scsi_transport) {
942 cxgb3i_api_debug("cxgb3i transport 0x%p.\n",
943 cxgb3i_scsi_transport);
944 iscsi_unregister_transport(&cxgb3i_iscsi_transport);
945 }
946}
Linux kernel - Deliverables
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