aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/scsi/cxgb3i/cxgb3i_iscsi.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/scsi/cxgb3i/cxgb3i_iscsi.c')
-rw-r--r--drivers/scsi/cxgb3i/cxgb3i_iscsi.c951
1 files changed, 951 insertions, 0 deletions
diff --git a/drivers/scsi/cxgb3i/cxgb3i_iscsi.c b/drivers/scsi/cxgb3i/cxgb3i_iscsi.c
new file mode 100644
index 000000000000..d83464b9b3f9
--- /dev/null
+++ b/drivers/scsi/cxgb3i/cxgb3i_iscsi.c
@@ -0,0 +1,951 @@
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,
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
203pci_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 */
213void 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 */
229static 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
276release_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 */
290static 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 */
307static 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 */
342static struct iscsi_cls_session *
343cxgb3i_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 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;
405 unsigned int max = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
406 cconn->hba->snic->tx_max_size -
407 ISCSI_PDU_NONPAYLOAD_MAX);
408
409 if (conn->max_xmit_dlength)
410 conn->max_xmit_dlength = min_t(unsigned int,
411 conn->max_xmit_dlength, max);
412 else
413 conn->max_xmit_dlength = max;
414 align_pdu_size(conn->max_xmit_dlength);
415 cxgb3i_log_info("conn 0x%p, max xmit %u.\n",
416 conn, conn->max_xmit_dlength);
417 return 0;
418}
419
420/**
421 * cxgb3i_conn_max_recv_dlength -- check the max. recv pdu segment size against
422 * the hardware limit
423 * @conn: iscsi connection
424 * return 0 if the value is valid, < 0 otherwise.
425 */
426static inline int cxgb3i_conn_max_recv_dlength(struct iscsi_conn *conn)
427{
428 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
429 struct cxgb3i_conn *cconn = tcp_conn->dd_data;
430 unsigned int max = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
431 cconn->hba->snic->rx_max_size -
432 ISCSI_PDU_NONPAYLOAD_MAX);
433
434 align_pdu_size(max);
435 if (conn->max_recv_dlength) {
436 if (conn->max_recv_dlength > max) {
437 cxgb3i_log_error("MaxRecvDataSegmentLength %u too big."
438 " Need to be <= %u.\n",
439 conn->max_recv_dlength, max);
440 return -EINVAL;
441 }
442 conn->max_recv_dlength = min_t(unsigned int,
443 conn->max_recv_dlength, max);
444 align_pdu_size(conn->max_recv_dlength);
445 } else
446 conn->max_recv_dlength = max;
447 cxgb3i_api_debug("conn 0x%p, max recv %u.\n",
448 conn, conn->max_recv_dlength);
449 return 0;
450}
451
452/**
453 * cxgb3i_conn_create - create iscsi connection instance
454 * @cls_session: pointer to iscsi cls session
455 * @cid: iscsi cid
456 *
457 * Creates a new iSCSI connection instance for a given session
458 */
459static struct iscsi_cls_conn *cxgb3i_conn_create(struct iscsi_cls_session
460 *cls_session, u32 cid)
461{
462 struct iscsi_cls_conn *cls_conn;
463 struct iscsi_conn *conn;
464 struct iscsi_tcp_conn *tcp_conn;
465 struct cxgb3i_conn *cconn;
466
467 cxgb3i_api_debug("sess 0x%p, cid %u.\n", cls_session, cid);
468
469 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
470 if (!cls_conn)
471 return NULL;
472 conn = cls_conn->dd_data;
473 tcp_conn = conn->dd_data;
474 cconn = tcp_conn->dd_data;
475
476 cconn->conn = conn;
477 return cls_conn;
478}
479
480/**
481 * cxgb3i_conn_bind - binds iscsi sess, conn and endpoint together
482 * @cls_session: pointer to iscsi cls session
483 * @cls_conn: pointer to iscsi cls conn
484 * @transport_eph: 64-bit EP handle
485 * @is_leading: leading connection on this session?
486 *
487 * Binds together an iSCSI session, an iSCSI connection and a
488 * TCP connection. This routine returns error code if the TCP
489 * connection does not belong on the device iSCSI sess/conn is bound
490 */
491
492static int cxgb3i_conn_bind(struct iscsi_cls_session *cls_session,
493 struct iscsi_cls_conn *cls_conn,
494 u64 transport_eph, int is_leading)
495{
496 struct iscsi_conn *conn = cls_conn->dd_data;
497 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
498 struct cxgb3i_conn *cconn = tcp_conn->dd_data;
499 struct cxgb3i_adapter *snic;
500 struct iscsi_endpoint *ep;
501 struct cxgb3i_endpoint *cep;
502 struct s3_conn *c3cn;
503 int err;
504
505 ep = iscsi_lookup_endpoint(transport_eph);
506 if (!ep)
507 return -EINVAL;
508
509 /* setup ddp pagesize */
510 cep = ep->dd_data;
511 c3cn = cep->c3cn;
512 snic = cep->hba->snic;
513 err = cxgb3i_setup_conn_host_pagesize(snic->tdev, c3cn->tid, 0);
514 if (err < 0)
515 return err;
516
517 cxgb3i_api_debug("ep 0x%p, cls sess 0x%p, cls conn 0x%p.\n",
518 ep, cls_session, cls_conn);
519
520 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
521 if (err)
522 return -EINVAL;
523
524 /* calculate the tag idx bits needed for this conn based on cmds_max */
525 cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
526 cxgb3i_api_debug("session cmds_max 0x%x, bits %u.\n",
527 conn->session->cmds_max, cconn->task_idx_bits);
528
529 read_lock(&c3cn->callback_lock);
530 c3cn->user_data = conn;
531 cconn->hba = cep->hba;
532 cconn->cep = cep;
533 cep->cconn = cconn;
534 read_unlock(&c3cn->callback_lock);
535
536 cxgb3i_conn_max_xmit_dlength(conn);
537 cxgb3i_conn_max_recv_dlength(conn);
538
539 spin_lock_bh(&conn->session->lock);
540 sprintf(conn->portal_address, NIPQUAD_FMT,
541 NIPQUAD(c3cn->daddr.sin_addr.s_addr));
542 conn->portal_port = ntohs(c3cn->daddr.sin_port);
543 spin_unlock_bh(&conn->session->lock);
544
545 /* init recv engine */
546 iscsi_tcp_hdr_recv_prep(tcp_conn);
547
548 return 0;
549}
550
551/**
552 * cxgb3i_conn_get_param - return iscsi connection parameter to caller
553 * @cls_conn: pointer to iscsi cls conn
554 * @param: parameter type identifier
555 * @buf: buffer pointer
556 *
557 * returns iSCSI connection parameters
558 */
559static int cxgb3i_conn_get_param(struct iscsi_cls_conn *cls_conn,
560 enum iscsi_param param, char *buf)
561{
562 struct iscsi_conn *conn = cls_conn->dd_data;
563 int len;
564
565 cxgb3i_api_debug("cls_conn 0x%p, param %d.\n", cls_conn, param);
566
567 switch (param) {
568 case ISCSI_PARAM_CONN_PORT:
569 spin_lock_bh(&conn->session->lock);
570 len = sprintf(buf, "%hu\n", conn->portal_port);
571 spin_unlock_bh(&conn->session->lock);
572 break;
573 case ISCSI_PARAM_CONN_ADDRESS:
574 spin_lock_bh(&conn->session->lock);
575 len = sprintf(buf, "%s\n", conn->portal_address);
576 spin_unlock_bh(&conn->session->lock);
577 break;
578 default:
579 return iscsi_conn_get_param(cls_conn, param, buf);
580 }
581
582 return len;
583}
584
585/**
586 * cxgb3i_conn_set_param - set iscsi connection parameter
587 * @cls_conn: pointer to iscsi cls conn
588 * @param: parameter type identifier
589 * @buf: buffer pointer
590 * @buflen: buffer length
591 *
592 * set iSCSI connection parameters
593 */
594static int cxgb3i_conn_set_param(struct iscsi_cls_conn *cls_conn,
595 enum iscsi_param param, char *buf, int buflen)
596{
597 struct iscsi_conn *conn = cls_conn->dd_data;
598 struct iscsi_session *session = conn->session;
599 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
600 struct cxgb3i_conn *cconn = tcp_conn->dd_data;
601 struct cxgb3i_adapter *snic = cconn->hba->snic;
602 struct s3_conn *c3cn = cconn->cep->c3cn;
603 int value, err = 0;
604
605 switch (param) {
606 case ISCSI_PARAM_HDRDGST_EN:
607 err = iscsi_set_param(cls_conn, param, buf, buflen);
608 if (!err && conn->hdrdgst_en)
609 err = cxgb3i_setup_conn_digest(snic->tdev, c3cn->tid,
610 conn->hdrdgst_en,
611 conn->datadgst_en, 0);
612 break;
613 case ISCSI_PARAM_DATADGST_EN:
614 err = iscsi_set_param(cls_conn, param, buf, buflen);
615 if (!err && conn->datadgst_en)
616 err = cxgb3i_setup_conn_digest(snic->tdev, c3cn->tid,
617 conn->hdrdgst_en,
618 conn->datadgst_en, 0);
619 break;
620 case ISCSI_PARAM_MAX_R2T:
621 sscanf(buf, "%d", &value);
622 if (value <= 0 || !is_power_of_2(value))
623 return -EINVAL;
624 if (session->max_r2t == value)
625 break;
626 iscsi_tcp_r2tpool_free(session);
627 err = iscsi_set_param(cls_conn, param, buf, buflen);
628 if (!err && iscsi_tcp_r2tpool_alloc(session))
629 return -ENOMEM;
630 case ISCSI_PARAM_MAX_RECV_DLENGTH:
631 err = iscsi_set_param(cls_conn, param, buf, buflen);
632 if (!err)
633 err = cxgb3i_conn_max_recv_dlength(conn);
634 break;
635 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
636 err = iscsi_set_param(cls_conn, param, buf, buflen);
637 if (!err)
638 err = cxgb3i_conn_max_xmit_dlength(conn);
639 break;
640 default:
641 return iscsi_set_param(cls_conn, param, buf, buflen);
642 }
643 return err;
644}
645
646/**
647 * cxgb3i_host_set_param - configure host (adapter) related parameters
648 * @shost: scsi host pointer
649 * @param: parameter type identifier
650 * @buf: buffer pointer
651 */
652static int cxgb3i_host_set_param(struct Scsi_Host *shost,
653 enum iscsi_host_param param,
654 char *buf, int buflen)
655{
656 struct cxgb3i_hba *hba = iscsi_host_priv(shost);
657
658 cxgb3i_api_debug("param %d, buf %s.\n", param, buf);
659
660 switch (param) {
661 case ISCSI_HOST_PARAM_IPADDRESS:
662 {
663 __be32 addr = in_aton(buf);
664 cxgb3i_set_private_ipv4addr(hba->ndev, addr);
665 return 0;
666 }
667 case ISCSI_HOST_PARAM_HWADDRESS:
668 case ISCSI_HOST_PARAM_NETDEV_NAME:
669 /* ignore */
670 return 0;
671 default:
672 return iscsi_host_set_param(shost, param, buf, buflen);
673 }
674}
675
676/**
677 * cxgb3i_host_get_param - returns host (adapter) related parameters
678 * @shost: scsi host pointer
679 * @param: parameter type identifier
680 * @buf: buffer pointer
681 */
682static int cxgb3i_host_get_param(struct Scsi_Host *shost,
683 enum iscsi_host_param param, char *buf)
684{
685 struct cxgb3i_hba *hba = iscsi_host_priv(shost);
686 int len = 0;
687
688 cxgb3i_api_debug("hba %s, param %d.\n", hba->ndev->name, param);
689
690 switch (param) {
691 case ISCSI_HOST_PARAM_HWADDRESS:
692 len = sysfs_format_mac(buf, hba->ndev->dev_addr, 6);
693 break;
694 case ISCSI_HOST_PARAM_NETDEV_NAME:
695 len = sprintf(buf, "%s\n", hba->ndev->name);
696 break;
697 case ISCSI_HOST_PARAM_IPADDRESS:
698 {
699 __be32 addr;
700
701 addr = cxgb3i_get_private_ipv4addr(hba->ndev);
702 len = sprintf(buf, NIPQUAD_FMT, NIPQUAD(addr));
703 break;
704 }
705 default:
706 return iscsi_host_get_param(shost, param, buf);
707 }
708 return len;
709}
710
711/**
712 * cxgb3i_conn_get_stats - returns iSCSI stats
713 * @cls_conn: pointer to iscsi cls conn
714 * @stats: pointer to iscsi statistic struct
715 */
716static void cxgb3i_conn_get_stats(struct iscsi_cls_conn *cls_conn,
717 struct iscsi_stats *stats)
718{
719 struct iscsi_conn *conn = cls_conn->dd_data;
720
721 stats->txdata_octets = conn->txdata_octets;
722 stats->rxdata_octets = conn->rxdata_octets;
723 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
724 stats->dataout_pdus = conn->dataout_pdus_cnt;
725 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
726 stats->datain_pdus = conn->datain_pdus_cnt;
727 stats->r2t_pdus = conn->r2t_pdus_cnt;
728 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
729 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
730 stats->digest_err = 0;
731 stats->timeout_err = 0;
732 stats->custom_length = 1;
733 strcpy(stats->custom[0].desc, "eh_abort_cnt");
734 stats->custom[0].value = conn->eh_abort_cnt;
735}
736
737/**
738 * cxgb3i_parse_itt - get the idx and age bits from a given tag
739 * @conn: iscsi connection
740 * @itt: itt tag
741 * @idx: task index, filled in by this function
742 * @age: session age, filled in by this function
743 */
744static void cxgb3i_parse_itt(struct iscsi_conn *conn, itt_t itt,
745 int *idx, int *age)
746{
747 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
748 struct cxgb3i_conn *cconn = tcp_conn->dd_data;
749 struct cxgb3i_adapter *snic = cconn->hba->snic;
750 u32 tag = ntohl((__force u32) itt);
751 u32 sw_bits;
752
753 sw_bits = cxgb3i_tag_nonrsvd_bits(&snic->tag_format, tag);
754 if (idx)
755 *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
756 if (age)
757 *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
758
759 cxgb3i_tag_debug("parse tag 0x%x/0x%x, sw 0x%x, itt 0x%x, age 0x%x.\n",
760 tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
761 age ? *age : 0xFF);
762}
763
764/**
765 * cxgb3i_reserve_itt - generate tag for a give task
766 * Try to set up ddp for a scsi read task.
767 * @task: iscsi task
768 * @hdr_itt: tag, filled in by this function
769 */
770int cxgb3i_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
771{
772 struct scsi_cmnd *sc = task->sc;
773 struct iscsi_conn *conn = task->conn;
774 struct iscsi_session *sess = conn->session;
775 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
776 struct cxgb3i_conn *cconn = tcp_conn->dd_data;
777 struct cxgb3i_adapter *snic = cconn->hba->snic;
778 struct cxgb3i_tag_format *tformat = &snic->tag_format;
779 u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
780 u32 tag;
781 int err = -EINVAL;
782
783 if (sc &&
784 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
785 cxgb3i_sw_tag_usable(tformat, sw_tag)) {
786 struct s3_conn *c3cn = cconn->cep->c3cn;
787 struct cxgb3i_gather_list *gl;
788
789 gl = cxgb3i_ddp_make_gl(scsi_in(sc)->length,
790 scsi_in(sc)->table.sgl,
791 scsi_in(sc)->table.nents,
792 snic->pdev,
793 GFP_ATOMIC);
794 if (gl) {
795 tag = sw_tag;
796 err = cxgb3i_ddp_tag_reserve(snic->tdev, c3cn->tid,
797 tformat, &tag,
798 gl, GFP_ATOMIC);
799 if (err < 0)
800 cxgb3i_ddp_release_gl(gl, snic->pdev);
801 }
802 }
803
804 if (err < 0)
805 tag = cxgb3i_set_non_ddp_tag(tformat, sw_tag);
806 /* the itt need to sent in big-endian order */
807 *hdr_itt = (__force itt_t)htonl(tag);
808
809 cxgb3i_tag_debug("new tag 0x%x/0x%x (itt 0x%x, age 0x%x).\n",
810 tag, *hdr_itt, task->itt, sess->age);
811 return 0;
812}
813
814/**
815 * cxgb3i_release_itt - release the tag for a given task
816 * if the tag is a ddp tag, release the ddp setup
817 * @task: iscsi task
818 * @hdr_itt: tag
819 */
820void cxgb3i_release_itt(struct iscsi_task *task, itt_t hdr_itt)
821{
822 struct scsi_cmnd *sc = task->sc;
823 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
824 struct cxgb3i_conn *cconn = tcp_conn->dd_data;
825 struct cxgb3i_adapter *snic = cconn->hba->snic;
826 struct cxgb3i_tag_format *tformat = &snic->tag_format;
827 u32 tag = ntohl((__force u32)hdr_itt);
828
829 cxgb3i_tag_debug("release tag 0x%x.\n", tag);
830
831 if (sc &&
832 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
833 cxgb3i_is_ddp_tag(tformat, tag))
834 cxgb3i_ddp_tag_release(snic->tdev, tag);
835}
836
837/**
838 * cxgb3i_host_template -- Scsi_Host_Template structure
839 * used when registering with the scsi mid layer
840 */
841static struct scsi_host_template cxgb3i_host_template = {
842 .module = THIS_MODULE,
843 .name = "Chelsio S3xx iSCSI Initiator",
844 .proc_name = "cxgb3i",
845 .queuecommand = iscsi_queuecommand,
846 .change_queue_depth = iscsi_change_queue_depth,
847 .can_queue = 128 * (ISCSI_DEF_XMIT_CMDS_MAX - 1),
848 .sg_tablesize = SG_ALL,
849 .max_sectors = 0xFFFF,
850 .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN,
851 .eh_abort_handler = iscsi_eh_abort,
852 .eh_device_reset_handler = iscsi_eh_device_reset,
853 .eh_target_reset_handler = iscsi_eh_target_reset,
854 .use_clustering = DISABLE_CLUSTERING,
855 .this_id = -1,
856};
857
858static struct iscsi_transport cxgb3i_iscsi_transport = {
859 .owner = THIS_MODULE,
860 .name = "cxgb3i",
861 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
862 | CAP_DATADGST | CAP_DIGEST_OFFLOAD |
863 CAP_PADDING_OFFLOAD,
864 .param_mask = ISCSI_MAX_RECV_DLENGTH |
865 ISCSI_MAX_XMIT_DLENGTH |
866 ISCSI_HDRDGST_EN |
867 ISCSI_DATADGST_EN |
868 ISCSI_INITIAL_R2T_EN |
869 ISCSI_MAX_R2T |
870 ISCSI_IMM_DATA_EN |
871 ISCSI_FIRST_BURST |
872 ISCSI_MAX_BURST |
873 ISCSI_PDU_INORDER_EN |
874 ISCSI_DATASEQ_INORDER_EN |
875 ISCSI_ERL |
876 ISCSI_CONN_PORT |
877 ISCSI_CONN_ADDRESS |
878 ISCSI_EXP_STATSN |
879 ISCSI_PERSISTENT_PORT |
880 ISCSI_PERSISTENT_ADDRESS |
881 ISCSI_TARGET_NAME | ISCSI_TPGT |
882 ISCSI_USERNAME | ISCSI_PASSWORD |
883 ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
884 ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
885 ISCSI_LU_RESET_TMO |
886 ISCSI_PING_TMO | ISCSI_RECV_TMO |
887 ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
888 .host_param_mask = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
889 ISCSI_HOST_INITIATOR_NAME | ISCSI_HOST_NETDEV_NAME,
890 .get_host_param = cxgb3i_host_get_param,
891 .set_host_param = cxgb3i_host_set_param,
892 /* session management */
893 .create_session = cxgb3i_session_create,
894 .destroy_session = cxgb3i_session_destroy,
895 .get_session_param = iscsi_session_get_param,
896 /* connection management */
897 .create_conn = cxgb3i_conn_create,
898 .bind_conn = cxgb3i_conn_bind,
899 .destroy_conn = iscsi_tcp_conn_teardown,
900 .start_conn = iscsi_conn_start,
901 .stop_conn = iscsi_conn_stop,
902 .get_conn_param = cxgb3i_conn_get_param,
903 .set_param = cxgb3i_conn_set_param,
904 .get_stats = cxgb3i_conn_get_stats,
905 /* pdu xmit req. from user space */
906 .send_pdu = iscsi_conn_send_pdu,
907 /* task */
908 .init_task = iscsi_tcp_task_init,
909 .xmit_task = iscsi_tcp_task_xmit,
910 .cleanup_task = cxgb3i_conn_cleanup_task,
911
912 /* pdu */
913 .alloc_pdu = cxgb3i_conn_alloc_pdu,
914 .init_pdu = cxgb3i_conn_init_pdu,
915 .xmit_pdu = cxgb3i_conn_xmit_pdu,
916 .parse_pdu_itt = cxgb3i_parse_itt,
917
918 /* TCP connect/disconnect */
919 .ep_connect = cxgb3i_ep_connect,
920 .ep_poll = cxgb3i_ep_poll,
921 .ep_disconnect = cxgb3i_ep_disconnect,
922 /* Error recovery timeout call */
923 .session_recovery_timedout = iscsi_session_recovery_timedout,
924};
925
926int cxgb3i_iscsi_init(void)
927{
928 sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
929 sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
930 cxgb3i_log_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
931 ISCSI_ITT_MASK, sw_tag_idx_bits,
932 ISCSI_AGE_MASK, sw_tag_age_bits);
933
934 cxgb3i_scsi_transport =
935 iscsi_register_transport(&cxgb3i_iscsi_transport);
936 if (!cxgb3i_scsi_transport) {
937 cxgb3i_log_error("Could not register cxgb3i transport.\n");
938 return -ENODEV;
939 }
940 cxgb3i_api_debug("cxgb3i transport 0x%p.\n", cxgb3i_scsi_transport);
941 return 0;
942}
943
944void cxgb3i_iscsi_cleanup(void)
945{
946 if (cxgb3i_scsi_transport) {
947 cxgb3i_api_debug("cxgb3i transport 0x%p.\n",
948 cxgb3i_scsi_transport);
949 iscsi_unregister_transport(&cxgb3i_iscsi_transport);
950 }
951}
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-27 13:02:21 -0500