Commit | Line | Data |
---|---|---|
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> | |
f00a3328 | 16 | #include <net/dst.h> |
c3673464 KX |
17 | #include <net/tcp.h> |
18 | #include <scsi/scsi_cmnd.h> | |
19 | #include <scsi/scsi_device.h> | |
20 | #include <scsi/scsi_eh.h> | |
21 | #include <scsi/scsi_host.h> | |
22 | #include <scsi/scsi.h> | |
23 | #include <scsi/iscsi_proto.h> | |
24 | #include <scsi/libiscsi.h> | |
25 | #include <scsi/scsi_transport_iscsi.h> | |
26 | ||
27 | #include "cxgb3i.h" | |
28 | #include "cxgb3i_pdu.h" | |
29 | ||
30 | #ifdef __DEBUG_CXGB3I_TAG__ | |
31 | #define cxgb3i_tag_debug cxgb3i_log_debug | |
32 | #else | |
33 | #define cxgb3i_tag_debug(fmt...) | |
34 | #endif | |
35 | ||
36 | #ifdef __DEBUG_CXGB3I_API__ | |
37 | #define cxgb3i_api_debug cxgb3i_log_debug | |
38 | #else | |
39 | #define cxgb3i_api_debug(fmt...) | |
40 | #endif | |
41 | ||
42 | /* | |
43 | * align pdu size to multiple of 512 for better performance | |
44 | */ | |
45 | #define align_pdu_size(n) do { n = (n) & (~511); } while (0) | |
46 | ||
47 | static struct scsi_transport_template *cxgb3i_scsi_transport; | |
48 | static struct scsi_host_template cxgb3i_host_template; | |
49 | static struct iscsi_transport cxgb3i_iscsi_transport; | |
50 | static unsigned char sw_tag_idx_bits; | |
51 | static unsigned char sw_tag_age_bits; | |
52 | ||
53 | static LIST_HEAD(cxgb3i_snic_list); | |
54 | static DEFINE_RWLOCK(cxgb3i_snic_rwlock); | |
55 | ||
56 | /** | |
515f1c88 KX |
57 | * cxgb3i_adpater_find_by_tdev - find the cxgb3i_adapter structure via t3cdev |
58 | * @tdev: t3cdev pointer | |
59 | */ | |
60 | struct cxgb3i_adapter *cxgb3i_adapter_find_by_tdev(struct t3cdev *tdev) | |
61 | { | |
62 | struct cxgb3i_adapter *snic; | |
63 | ||
64 | read_lock(&cxgb3i_snic_rwlock); | |
65 | list_for_each_entry(snic, &cxgb3i_snic_list, list_head) { | |
66 | if (snic->tdev == tdev) { | |
67 | read_unlock(&cxgb3i_snic_rwlock); | |
68 | return snic; | |
69 | } | |
70 | } | |
71 | read_unlock(&cxgb3i_snic_rwlock); | |
72 | return NULL; | |
73 | } | |
74 | ||
ed6f7744 | 75 | static inline int adapter_update(struct cxgb3i_adapter *snic) |
c3673464 | 76 | { |
ed6f7744 MC |
77 | cxgb3i_log_info("snic 0x%p, t3dev 0x%p, updating.\n", |
78 | snic, snic->tdev); | |
79 | return cxgb3i_adapter_ddp_info(snic->tdev, &snic->tag_format, | |
80 | &snic->tx_max_size, | |
81 | &snic->rx_max_size); | |
82 | } | |
c3673464 | 83 | |
ed6f7744 MC |
84 | static int adapter_add(struct cxgb3i_adapter *snic) |
85 | { | |
86 | struct t3cdev *t3dev = snic->tdev; | |
87 | struct adapter *adapter = tdev2adap(t3dev); | |
88 | int i, err; | |
c3673464 | 89 | |
c3673464 KX |
90 | snic->pdev = adapter->pdev; |
91 | snic->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits; | |
92 | ||
ed6f7744 | 93 | err = cxgb3i_adapter_ddp_info(t3dev, &snic->tag_format, |
c3673464 | 94 | &snic->tx_max_size, |
ed6f7744 MC |
95 | &snic->rx_max_size); |
96 | if (err < 0) | |
97 | return err; | |
c3673464 KX |
98 | |
99 | for_each_port(adapter, i) { | |
100 | snic->hba[i] = cxgb3i_hba_host_add(snic, adapter->port[i]); | |
101 | if (!snic->hba[i]) | |
ed6f7744 | 102 | return -EINVAL; |
c3673464 KX |
103 | } |
104 | snic->hba_cnt = adapter->params.nports; | |
105 | ||
106 | /* add to the list */ | |
107 | write_lock(&cxgb3i_snic_rwlock); | |
108 | list_add_tail(&snic->list_head, &cxgb3i_snic_list); | |
109 | write_unlock(&cxgb3i_snic_rwlock); | |
110 | ||
ed6f7744 MC |
111 | cxgb3i_log_info("t3dev 0x%p open, snic 0x%p, %u scsi hosts added.\n", |
112 | t3dev, snic, snic->hba_cnt); | |
113 | return 0; | |
114 | } | |
c3673464 | 115 | |
ed6f7744 MC |
116 | /** |
117 | * cxgb3i_adapter_open - init a s3 adapter structure and any h/w settings | |
118 | * @t3dev: t3cdev adapter | |
119 | */ | |
120 | void cxgb3i_adapter_open(struct t3cdev *t3dev) | |
121 | { | |
122 | struct cxgb3i_adapter *snic = cxgb3i_adapter_find_by_tdev(t3dev); | |
123 | int err; | |
124 | ||
125 | if (snic) | |
126 | err = adapter_update(snic); | |
127 | else { | |
128 | snic = kzalloc(sizeof(*snic), GFP_KERNEL); | |
129 | if (snic) { | |
130 | spin_lock_init(&snic->lock); | |
131 | snic->tdev = t3dev; | |
132 | err = adapter_add(snic); | |
133 | } else | |
134 | err = -ENOMEM; | |
135 | } | |
136 | ||
137 | if (err < 0) { | |
138 | cxgb3i_log_info("snic 0x%p, f 0x%x, t3dev 0x%p open, err %d.\n", | |
139 | snic, snic ? snic->flags : 0, t3dev, err); | |
140 | if (snic) { | |
141 | snic->flags &= ~CXGB3I_ADAPTER_FLAG_RESET; | |
142 | cxgb3i_adapter_close(t3dev); | |
143 | } | |
144 | } | |
c3673464 KX |
145 | } |
146 | ||
147 | /** | |
515f1c88 | 148 | * cxgb3i_adapter_close - release the resources held and cleanup h/w settings |
c3673464 KX |
149 | * @t3dev: t3cdev adapter |
150 | */ | |
515f1c88 | 151 | void cxgb3i_adapter_close(struct t3cdev *t3dev) |
c3673464 | 152 | { |
ed6f7744 | 153 | struct cxgb3i_adapter *snic = cxgb3i_adapter_find_by_tdev(t3dev); |
c3673464 | 154 | int i; |
ed6f7744 MC |
155 | |
156 | if (!snic || snic->flags & CXGB3I_ADAPTER_FLAG_RESET) { | |
157 | cxgb3i_log_info("t3dev 0x%p close, snic 0x%p, f 0x%x.\n", | |
158 | t3dev, snic, snic ? snic->flags : 0); | |
159 | return; | |
160 | } | |
c3673464 KX |
161 | |
162 | /* remove from the list */ | |
163 | write_lock(&cxgb3i_snic_rwlock); | |
ed6f7744 | 164 | list_del(&snic->list_head); |
c3673464 KX |
165 | write_unlock(&cxgb3i_snic_rwlock); |
166 | ||
ed6f7744 MC |
167 | for (i = 0; i < snic->hba_cnt; i++) { |
168 | if (snic->hba[i]) { | |
169 | cxgb3i_hba_host_remove(snic->hba[i]); | |
170 | snic->hba[i] = NULL; | |
c3673464 | 171 | } |
c3673464 | 172 | } |
ed6f7744 MC |
173 | cxgb3i_log_info("t3dev 0x%p close, snic 0x%p, %u scsi hosts removed.\n", |
174 | t3dev, snic, snic->hba_cnt); | |
175 | kfree(snic); | |
c3673464 KX |
176 | } |
177 | ||
178 | /** | |
154229a3 | 179 | * cxgb3i_hba_find_by_netdev - find the cxgb3i_hba structure via net_device |
c3673464 KX |
180 | * @t3dev: t3cdev adapter |
181 | */ | |
10eb0f01 | 182 | static struct cxgb3i_hba *cxgb3i_hba_find_by_netdev(struct net_device *ndev) |
c3673464 KX |
183 | { |
184 | struct cxgb3i_adapter *snic; | |
185 | int i; | |
186 | ||
187 | read_lock(&cxgb3i_snic_rwlock); | |
188 | list_for_each_entry(snic, &cxgb3i_snic_list, list_head) { | |
189 | for (i = 0; i < snic->hba_cnt; i++) { | |
190 | if (snic->hba[i]->ndev == ndev) { | |
191 | read_unlock(&cxgb3i_snic_rwlock); | |
192 | return snic->hba[i]; | |
193 | } | |
194 | } | |
195 | } | |
196 | read_unlock(&cxgb3i_snic_rwlock); | |
197 | return NULL; | |
198 | } | |
199 | ||
200 | /** | |
201 | * cxgb3i_hba_host_add - register a new host with scsi/iscsi | |
202 | * @snic: the cxgb3i adapter | |
203 | * @ndev: associated net_device | |
204 | */ | |
205 | struct cxgb3i_hba *cxgb3i_hba_host_add(struct cxgb3i_adapter *snic, | |
206 | struct net_device *ndev) | |
207 | { | |
208 | struct cxgb3i_hba *hba; | |
209 | struct Scsi_Host *shost; | |
210 | int err; | |
211 | ||
212 | shost = iscsi_host_alloc(&cxgb3i_host_template, | |
4d108350 | 213 | sizeof(struct cxgb3i_hba), 1); |
c3673464 | 214 | if (!shost) { |
ed6f7744 MC |
215 | cxgb3i_log_info("snic 0x%p, ndev 0x%p, host_alloc failed.\n", |
216 | snic, ndev); | |
c3673464 KX |
217 | return NULL; |
218 | } | |
219 | ||
220 | shost->transportt = cxgb3i_scsi_transport; | |
221 | shost->max_lun = CXGB3I_MAX_LUN; | |
222 | shost->max_id = CXGB3I_MAX_TARGET; | |
223 | shost->max_channel = 0; | |
224 | shost->max_cmd_len = 16; | |
225 | ||
226 | hba = iscsi_host_priv(shost); | |
227 | hba->snic = snic; | |
228 | hba->ndev = ndev; | |
229 | hba->shost = shost; | |
230 | ||
231 | pci_dev_get(snic->pdev); | |
232 | err = iscsi_host_add(shost, &snic->pdev->dev); | |
233 | if (err) { | |
ed6f7744 MC |
234 | cxgb3i_log_info("snic 0x%p, ndev 0x%p, host_add failed.\n", |
235 | snic, ndev); | |
c3673464 KX |
236 | goto pci_dev_put; |
237 | } | |
238 | ||
239 | cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n", | |
240 | shost, hba, shost->host_no); | |
241 | ||
242 | return hba; | |
243 | ||
244 | pci_dev_put: | |
245 | pci_dev_put(snic->pdev); | |
246 | scsi_host_put(shost); | |
247 | return NULL; | |
248 | } | |
249 | ||
250 | /** | |
251 | * cxgb3i_hba_host_remove - de-register the host with scsi/iscsi | |
252 | * @hba: the cxgb3i hba | |
253 | */ | |
254 | void cxgb3i_hba_host_remove(struct cxgb3i_hba *hba) | |
255 | { | |
256 | cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n", | |
257 | hba->shost, hba, hba->shost->host_no); | |
258 | iscsi_host_remove(hba->shost); | |
259 | pci_dev_put(hba->snic->pdev); | |
260 | iscsi_host_free(hba->shost); | |
261 | } | |
262 | ||
263 | /** | |
264 | * cxgb3i_ep_connect - establish TCP connection to target portal | |
10eb0f01 | 265 | * @shost: scsi host to use |
c3673464 KX |
266 | * @dst_addr: target IP address |
267 | * @non_blocking: blocking or non-blocking call | |
268 | * | |
269 | * Initiates a TCP/IP connection to the dst_addr | |
270 | */ | |
10eb0f01 MC |
271 | static struct iscsi_endpoint *cxgb3i_ep_connect(struct Scsi_Host *shost, |
272 | struct sockaddr *dst_addr, | |
c3673464 KX |
273 | int non_blocking) |
274 | { | |
275 | struct iscsi_endpoint *ep; | |
276 | struct cxgb3i_endpoint *cep; | |
10eb0f01 | 277 | struct cxgb3i_hba *hba = NULL; |
c3673464 KX |
278 | struct s3_conn *c3cn = NULL; |
279 | int err = 0; | |
280 | ||
10eb0f01 MC |
281 | if (shost) |
282 | hba = iscsi_host_priv(shost); | |
283 | ||
284 | cxgb3i_api_debug("shost 0x%p, hba 0x%p.\n", shost, hba); | |
285 | ||
c3673464 KX |
286 | c3cn = cxgb3i_c3cn_create(); |
287 | if (!c3cn) { | |
288 | cxgb3i_log_info("ep connect OOM.\n"); | |
289 | err = -ENOMEM; | |
290 | goto release_conn; | |
291 | } | |
292 | ||
10eb0f01 MC |
293 | err = cxgb3i_c3cn_connect(hba ? hba->ndev : NULL, c3cn, |
294 | (struct sockaddr_in *)dst_addr); | |
c3673464 KX |
295 | if (err < 0) { |
296 | cxgb3i_log_info("ep connect failed.\n"); | |
297 | goto release_conn; | |
298 | } | |
10eb0f01 | 299 | |
c3673464 KX |
300 | hba = cxgb3i_hba_find_by_netdev(c3cn->dst_cache->dev); |
301 | if (!hba) { | |
302 | err = -ENOSPC; | |
303 | cxgb3i_log_info("NOT going through cxgbi device.\n"); | |
304 | goto release_conn; | |
305 | } | |
10eb0f01 MC |
306 | |
307 | if (shost && hba != iscsi_host_priv(shost)) { | |
308 | err = -ENOSPC; | |
309 | cxgb3i_log_info("Could not connect through request host%u\n", | |
310 | shost->host_no); | |
311 | goto release_conn; | |
312 | } | |
313 | ||
c3673464 KX |
314 | if (c3cn_is_closing(c3cn)) { |
315 | err = -ENOSPC; | |
316 | cxgb3i_log_info("ep connect unable to connect.\n"); | |
317 | goto release_conn; | |
318 | } | |
319 | ||
320 | ep = iscsi_create_endpoint(sizeof(*cep)); | |
321 | if (!ep) { | |
322 | err = -ENOMEM; | |
323 | cxgb3i_log_info("iscsi alloc ep, OOM.\n"); | |
324 | goto release_conn; | |
325 | } | |
326 | cep = ep->dd_data; | |
327 | cep->c3cn = c3cn; | |
328 | cep->hba = hba; | |
329 | ||
330 | cxgb3i_api_debug("ep 0x%p, 0x%p, c3cn 0x%p, hba 0x%p.\n", | |
331 | ep, cep, c3cn, hba); | |
332 | return ep; | |
333 | ||
334 | release_conn: | |
335 | cxgb3i_api_debug("conn 0x%p failed, release.\n", c3cn); | |
336 | if (c3cn) | |
337 | cxgb3i_c3cn_release(c3cn); | |
338 | return ERR_PTR(err); | |
339 | } | |
340 | ||
341 | /** | |
342 | * cxgb3i_ep_poll - polls for TCP connection establishement | |
343 | * @ep: TCP connection (endpoint) handle | |
344 | * @timeout_ms: timeout value in milli secs | |
345 | * | |
346 | * polls for TCP connect request to complete | |
347 | */ | |
348 | static int cxgb3i_ep_poll(struct iscsi_endpoint *ep, int timeout_ms) | |
349 | { | |
350 | struct cxgb3i_endpoint *cep = ep->dd_data; | |
351 | struct s3_conn *c3cn = cep->c3cn; | |
352 | ||
353 | if (!c3cn_is_established(c3cn)) | |
354 | return 0; | |
355 | cxgb3i_api_debug("ep 0x%p, c3cn 0x%p established.\n", ep, c3cn); | |
356 | return 1; | |
357 | } | |
358 | ||
359 | /** | |
360 | * cxgb3i_ep_disconnect - teardown TCP connection | |
361 | * @ep: TCP connection (endpoint) handle | |
362 | * | |
363 | * teardown TCP connection | |
364 | */ | |
365 | static void cxgb3i_ep_disconnect(struct iscsi_endpoint *ep) | |
366 | { | |
367 | struct cxgb3i_endpoint *cep = ep->dd_data; | |
368 | struct cxgb3i_conn *cconn = cep->cconn; | |
369 | ||
370 | cxgb3i_api_debug("ep 0x%p, cep 0x%p.\n", ep, cep); | |
371 | ||
372 | if (cconn && cconn->conn) { | |
373 | /* | |
374 | * stop the xmit path so the xmit_pdu function is | |
375 | * not being called | |
376 | */ | |
377 | iscsi_suspend_tx(cconn->conn); | |
378 | ||
379 | write_lock_bh(&cep->c3cn->callback_lock); | |
380 | cep->c3cn->user_data = NULL; | |
381 | cconn->cep = NULL; | |
382 | write_unlock_bh(&cep->c3cn->callback_lock); | |
383 | } | |
384 | ||
385 | cxgb3i_api_debug("ep 0x%p, cep 0x%p, release c3cn 0x%p.\n", | |
386 | ep, cep, cep->c3cn); | |
387 | cxgb3i_c3cn_release(cep->c3cn); | |
388 | iscsi_destroy_endpoint(ep); | |
389 | } | |
390 | ||
391 | /** | |
392 | * cxgb3i_session_create - create a new iscsi session | |
393 | * @cmds_max: max # of commands | |
394 | * @qdepth: scsi queue depth | |
395 | * @initial_cmdsn: initial iscsi CMDSN for this session | |
c3673464 KX |
396 | * |
397 | * Creates a new iSCSI session | |
398 | */ | |
399 | static struct iscsi_cls_session * | |
400 | cxgb3i_session_create(struct iscsi_endpoint *ep, u16 cmds_max, u16 qdepth, | |
5e7facb7 | 401 | u32 initial_cmdsn) |
c3673464 KX |
402 | { |
403 | struct cxgb3i_endpoint *cep; | |
404 | struct cxgb3i_hba *hba; | |
405 | struct Scsi_Host *shost; | |
406 | struct iscsi_cls_session *cls_session; | |
407 | struct iscsi_session *session; | |
408 | ||
409 | if (!ep) { | |
410 | cxgb3i_log_error("%s, missing endpoint.\n", __func__); | |
411 | return NULL; | |
412 | } | |
413 | ||
414 | cep = ep->dd_data; | |
415 | hba = cep->hba; | |
416 | shost = hba->shost; | |
417 | cxgb3i_api_debug("ep 0x%p, cep 0x%p, hba 0x%p.\n", ep, cep, hba); | |
418 | BUG_ON(hba != iscsi_host_priv(shost)); | |
419 | ||
c3673464 KX |
420 | cls_session = iscsi_session_setup(&cxgb3i_iscsi_transport, shost, |
421 | cmds_max, | |
949847d1 KX |
422 | sizeof(struct iscsi_tcp_task) + |
423 | sizeof(struct cxgb3i_task_data), | |
c3673464 KX |
424 | initial_cmdsn, ISCSI_MAX_TARGET); |
425 | if (!cls_session) | |
426 | return NULL; | |
427 | session = cls_session->dd_data; | |
428 | if (iscsi_tcp_r2tpool_alloc(session)) | |
429 | goto remove_session; | |
430 | ||
431 | return cls_session; | |
432 | ||
433 | remove_session: | |
434 | iscsi_session_teardown(cls_session); | |
435 | return NULL; | |
436 | } | |
437 | ||
438 | /** | |
439 | * cxgb3i_session_destroy - destroys iscsi session | |
440 | * @cls_session: pointer to iscsi cls session | |
441 | * | |
442 | * Destroys an iSCSI session instance and releases its all resources held | |
443 | */ | |
444 | static void cxgb3i_session_destroy(struct iscsi_cls_session *cls_session) | |
445 | { | |
446 | cxgb3i_api_debug("sess 0x%p.\n", cls_session); | |
447 | iscsi_tcp_r2tpool_free(cls_session->dd_data); | |
448 | iscsi_session_teardown(cls_session); | |
449 | } | |
450 | ||
451 | /** | |
154229a3 | 452 | * cxgb3i_conn_max_xmit_dlength -- calc the max. xmit pdu segment size |
c3673464 | 453 | * @conn: iscsi connection |
154229a3 | 454 | * check the max. xmit pdu payload, reduce it if needed |
c3673464 KX |
455 | */ |
456 | static inline int cxgb3i_conn_max_xmit_dlength(struct iscsi_conn *conn) | |
457 | ||
458 | { | |
459 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
460 | struct cxgb3i_conn *cconn = tcp_conn->dd_data; | |
f62d0896 | 461 | unsigned int max = max(512 * MAX_SKB_FRAGS, SKB_TX_HEADROOM); |
c3673464 | 462 | |
f62d0896 | 463 | max = min(cconn->hba->snic->tx_max_size, max); |
c3673464 | 464 | if (conn->max_xmit_dlength) |
f62d0896 | 465 | conn->max_xmit_dlength = min(conn->max_xmit_dlength, max); |
c3673464 KX |
466 | else |
467 | conn->max_xmit_dlength = max; | |
468 | align_pdu_size(conn->max_xmit_dlength); | |
f62d0896 | 469 | cxgb3i_api_debug("conn 0x%p, max xmit %u.\n", |
c3673464 KX |
470 | conn, conn->max_xmit_dlength); |
471 | return 0; | |
472 | } | |
473 | ||
474 | /** | |
154229a3 | 475 | * cxgb3i_conn_max_recv_dlength -- check the max. recv pdu segment size |
c3673464 KX |
476 | * @conn: iscsi connection |
477 | * return 0 if the value is valid, < 0 otherwise. | |
478 | */ | |
479 | static inline int cxgb3i_conn_max_recv_dlength(struct iscsi_conn *conn) | |
480 | { | |
481 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
482 | struct cxgb3i_conn *cconn = tcp_conn->dd_data; | |
f62d0896 | 483 | unsigned int max = cconn->hba->snic->rx_max_size; |
c3673464 KX |
484 | |
485 | align_pdu_size(max); | |
486 | if (conn->max_recv_dlength) { | |
487 | if (conn->max_recv_dlength > max) { | |
488 | cxgb3i_log_error("MaxRecvDataSegmentLength %u too big." | |
489 | " Need to be <= %u.\n", | |
490 | conn->max_recv_dlength, max); | |
491 | return -EINVAL; | |
492 | } | |
f62d0896 | 493 | conn->max_recv_dlength = min(conn->max_recv_dlength, max); |
c3673464 KX |
494 | align_pdu_size(conn->max_recv_dlength); |
495 | } else | |
496 | conn->max_recv_dlength = max; | |
497 | cxgb3i_api_debug("conn 0x%p, max recv %u.\n", | |
498 | conn, conn->max_recv_dlength); | |
499 | return 0; | |
500 | } | |
501 | ||
502 | /** | |
503 | * cxgb3i_conn_create - create iscsi connection instance | |
504 | * @cls_session: pointer to iscsi cls session | |
505 | * @cid: iscsi cid | |
506 | * | |
507 | * Creates a new iSCSI connection instance for a given session | |
508 | */ | |
509 | static struct iscsi_cls_conn *cxgb3i_conn_create(struct iscsi_cls_session | |
510 | *cls_session, u32 cid) | |
511 | { | |
512 | struct iscsi_cls_conn *cls_conn; | |
513 | struct iscsi_conn *conn; | |
514 | struct iscsi_tcp_conn *tcp_conn; | |
515 | struct cxgb3i_conn *cconn; | |
516 | ||
517 | cxgb3i_api_debug("sess 0x%p, cid %u.\n", cls_session, cid); | |
518 | ||
519 | cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid); | |
520 | if (!cls_conn) | |
521 | return NULL; | |
522 | conn = cls_conn->dd_data; | |
523 | tcp_conn = conn->dd_data; | |
524 | cconn = tcp_conn->dd_data; | |
525 | ||
526 | cconn->conn = conn; | |
527 | return cls_conn; | |
528 | } | |
529 | ||
530 | /** | |
531 | * cxgb3i_conn_bind - binds iscsi sess, conn and endpoint together | |
532 | * @cls_session: pointer to iscsi cls session | |
533 | * @cls_conn: pointer to iscsi cls conn | |
534 | * @transport_eph: 64-bit EP handle | |
535 | * @is_leading: leading connection on this session? | |
536 | * | |
537 | * Binds together an iSCSI session, an iSCSI connection and a | |
538 | * TCP connection. This routine returns error code if the TCP | |
539 | * connection does not belong on the device iSCSI sess/conn is bound | |
540 | */ | |
541 | ||
542 | static int cxgb3i_conn_bind(struct iscsi_cls_session *cls_session, | |
543 | struct iscsi_cls_conn *cls_conn, | |
544 | u64 transport_eph, int is_leading) | |
545 | { | |
546 | struct iscsi_conn *conn = cls_conn->dd_data; | |
547 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
548 | struct cxgb3i_conn *cconn = tcp_conn->dd_data; | |
549 | struct cxgb3i_adapter *snic; | |
550 | struct iscsi_endpoint *ep; | |
551 | struct cxgb3i_endpoint *cep; | |
552 | struct s3_conn *c3cn; | |
553 | int err; | |
554 | ||
555 | ep = iscsi_lookup_endpoint(transport_eph); | |
556 | if (!ep) | |
557 | return -EINVAL; | |
558 | ||
559 | /* setup ddp pagesize */ | |
560 | cep = ep->dd_data; | |
561 | c3cn = cep->c3cn; | |
562 | snic = cep->hba->snic; | |
563 | err = cxgb3i_setup_conn_host_pagesize(snic->tdev, c3cn->tid, 0); | |
564 | if (err < 0) | |
565 | return err; | |
566 | ||
567 | cxgb3i_api_debug("ep 0x%p, cls sess 0x%p, cls conn 0x%p.\n", | |
568 | ep, cls_session, cls_conn); | |
569 | ||
570 | err = iscsi_conn_bind(cls_session, cls_conn, is_leading); | |
571 | if (err) | |
572 | return -EINVAL; | |
573 | ||
574 | /* calculate the tag idx bits needed for this conn based on cmds_max */ | |
575 | cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1; | |
576 | cxgb3i_api_debug("session cmds_max 0x%x, bits %u.\n", | |
577 | conn->session->cmds_max, cconn->task_idx_bits); | |
578 | ||
579 | read_lock(&c3cn->callback_lock); | |
580 | c3cn->user_data = conn; | |
581 | cconn->hba = cep->hba; | |
582 | cconn->cep = cep; | |
583 | cep->cconn = cconn; | |
584 | read_unlock(&c3cn->callback_lock); | |
585 | ||
586 | cxgb3i_conn_max_xmit_dlength(conn); | |
587 | cxgb3i_conn_max_recv_dlength(conn); | |
588 | ||
589 | spin_lock_bh(&conn->session->lock); | |
590 | sprintf(conn->portal_address, NIPQUAD_FMT, | |
591 | NIPQUAD(c3cn->daddr.sin_addr.s_addr)); | |
592 | conn->portal_port = ntohs(c3cn->daddr.sin_port); | |
593 | spin_unlock_bh(&conn->session->lock); | |
594 | ||
595 | /* init recv engine */ | |
596 | iscsi_tcp_hdr_recv_prep(tcp_conn); | |
597 | ||
598 | return 0; | |
599 | } | |
600 | ||
601 | /** | |
602 | * cxgb3i_conn_get_param - return iscsi connection parameter to caller | |
603 | * @cls_conn: pointer to iscsi cls conn | |
604 | * @param: parameter type identifier | |
605 | * @buf: buffer pointer | |
606 | * | |
607 | * returns iSCSI connection parameters | |
608 | */ | |
609 | static int cxgb3i_conn_get_param(struct iscsi_cls_conn *cls_conn, | |
610 | enum iscsi_param param, char *buf) | |
611 | { | |
612 | struct iscsi_conn *conn = cls_conn->dd_data; | |
613 | int len; | |
614 | ||
615 | cxgb3i_api_debug("cls_conn 0x%p, param %d.\n", cls_conn, param); | |
616 | ||
617 | switch (param) { | |
618 | case ISCSI_PARAM_CONN_PORT: | |
619 | spin_lock_bh(&conn->session->lock); | |
620 | len = sprintf(buf, "%hu\n", conn->portal_port); | |
621 | spin_unlock_bh(&conn->session->lock); | |
622 | break; | |
623 | case ISCSI_PARAM_CONN_ADDRESS: | |
624 | spin_lock_bh(&conn->session->lock); | |
625 | len = sprintf(buf, "%s\n", conn->portal_address); | |
626 | spin_unlock_bh(&conn->session->lock); | |
627 | break; | |
628 | default: | |
629 | return iscsi_conn_get_param(cls_conn, param, buf); | |
630 | } | |
631 | ||
632 | return len; | |
633 | } | |
634 | ||
635 | /** | |
636 | * cxgb3i_conn_set_param - set iscsi connection parameter | |
637 | * @cls_conn: pointer to iscsi cls conn | |
638 | * @param: parameter type identifier | |
639 | * @buf: buffer pointer | |
640 | * @buflen: buffer length | |
641 | * | |
642 | * set iSCSI connection parameters | |
643 | */ | |
644 | static int cxgb3i_conn_set_param(struct iscsi_cls_conn *cls_conn, | |
645 | enum iscsi_param param, char *buf, int buflen) | |
646 | { | |
647 | struct iscsi_conn *conn = cls_conn->dd_data; | |
648 | struct iscsi_session *session = conn->session; | |
649 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
650 | struct cxgb3i_conn *cconn = tcp_conn->dd_data; | |
651 | struct cxgb3i_adapter *snic = cconn->hba->snic; | |
652 | struct s3_conn *c3cn = cconn->cep->c3cn; | |
653 | int value, err = 0; | |
654 | ||
655 | switch (param) { | |
656 | case ISCSI_PARAM_HDRDGST_EN: | |
657 | err = iscsi_set_param(cls_conn, param, buf, buflen); | |
658 | if (!err && conn->hdrdgst_en) | |
659 | err = cxgb3i_setup_conn_digest(snic->tdev, c3cn->tid, | |
660 | conn->hdrdgst_en, | |
661 | conn->datadgst_en, 0); | |
662 | break; | |
663 | case ISCSI_PARAM_DATADGST_EN: | |
664 | err = iscsi_set_param(cls_conn, param, buf, buflen); | |
665 | if (!err && conn->datadgst_en) | |
666 | err = cxgb3i_setup_conn_digest(snic->tdev, c3cn->tid, | |
667 | conn->hdrdgst_en, | |
668 | conn->datadgst_en, 0); | |
669 | break; | |
670 | case ISCSI_PARAM_MAX_R2T: | |
671 | sscanf(buf, "%d", &value); | |
672 | if (value <= 0 || !is_power_of_2(value)) | |
673 | return -EINVAL; | |
674 | if (session->max_r2t == value) | |
675 | break; | |
676 | iscsi_tcp_r2tpool_free(session); | |
677 | err = iscsi_set_param(cls_conn, param, buf, buflen); | |
678 | if (!err && iscsi_tcp_r2tpool_alloc(session)) | |
679 | return -ENOMEM; | |
680 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
681 | err = iscsi_set_param(cls_conn, param, buf, buflen); | |
682 | if (!err) | |
683 | err = cxgb3i_conn_max_recv_dlength(conn); | |
684 | break; | |
685 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
686 | err = iscsi_set_param(cls_conn, param, buf, buflen); | |
687 | if (!err) | |
688 | err = cxgb3i_conn_max_xmit_dlength(conn); | |
689 | break; | |
690 | default: | |
691 | return iscsi_set_param(cls_conn, param, buf, buflen); | |
692 | } | |
693 | return err; | |
694 | } | |
695 | ||
696 | /** | |
697 | * cxgb3i_host_set_param - configure host (adapter) related parameters | |
698 | * @shost: scsi host pointer | |
699 | * @param: parameter type identifier | |
700 | * @buf: buffer pointer | |
701 | */ | |
702 | static int cxgb3i_host_set_param(struct Scsi_Host *shost, | |
703 | enum iscsi_host_param param, | |
704 | char *buf, int buflen) | |
705 | { | |
706 | struct cxgb3i_hba *hba = iscsi_host_priv(shost); | |
707 | ||
708 | cxgb3i_api_debug("param %d, buf %s.\n", param, buf); | |
709 | ||
710 | switch (param) { | |
711 | case ISCSI_HOST_PARAM_IPADDRESS: | |
712 | { | |
713 | __be32 addr = in_aton(buf); | |
714 | cxgb3i_set_private_ipv4addr(hba->ndev, addr); | |
715 | return 0; | |
716 | } | |
717 | case ISCSI_HOST_PARAM_HWADDRESS: | |
718 | case ISCSI_HOST_PARAM_NETDEV_NAME: | |
719 | /* ignore */ | |
720 | return 0; | |
721 | default: | |
722 | return iscsi_host_set_param(shost, param, buf, buflen); | |
723 | } | |
724 | } | |
725 | ||
726 | /** | |
727 | * cxgb3i_host_get_param - returns host (adapter) related parameters | |
728 | * @shost: scsi host pointer | |
729 | * @param: parameter type identifier | |
730 | * @buf: buffer pointer | |
731 | */ | |
732 | static int cxgb3i_host_get_param(struct Scsi_Host *shost, | |
733 | enum iscsi_host_param param, char *buf) | |
734 | { | |
735 | struct cxgb3i_hba *hba = iscsi_host_priv(shost); | |
736 | int len = 0; | |
737 | ||
738 | cxgb3i_api_debug("hba %s, param %d.\n", hba->ndev->name, param); | |
739 | ||
740 | switch (param) { | |
741 | case ISCSI_HOST_PARAM_HWADDRESS: | |
742 | len = sysfs_format_mac(buf, hba->ndev->dev_addr, 6); | |
743 | break; | |
744 | case ISCSI_HOST_PARAM_NETDEV_NAME: | |
745 | len = sprintf(buf, "%s\n", hba->ndev->name); | |
746 | break; | |
747 | case ISCSI_HOST_PARAM_IPADDRESS: | |
748 | { | |
749 | __be32 addr; | |
750 | ||
751 | addr = cxgb3i_get_private_ipv4addr(hba->ndev); | |
752 | len = sprintf(buf, NIPQUAD_FMT, NIPQUAD(addr)); | |
753 | break; | |
754 | } | |
755 | default: | |
756 | return iscsi_host_get_param(shost, param, buf); | |
757 | } | |
758 | return len; | |
759 | } | |
760 | ||
761 | /** | |
762 | * cxgb3i_conn_get_stats - returns iSCSI stats | |
763 | * @cls_conn: pointer to iscsi cls conn | |
764 | * @stats: pointer to iscsi statistic struct | |
765 | */ | |
766 | static void cxgb3i_conn_get_stats(struct iscsi_cls_conn *cls_conn, | |
767 | struct iscsi_stats *stats) | |
768 | { | |
769 | struct iscsi_conn *conn = cls_conn->dd_data; | |
770 | ||
771 | stats->txdata_octets = conn->txdata_octets; | |
772 | stats->rxdata_octets = conn->rxdata_octets; | |
773 | stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; | |
774 | stats->dataout_pdus = conn->dataout_pdus_cnt; | |
775 | stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; | |
776 | stats->datain_pdus = conn->datain_pdus_cnt; | |
777 | stats->r2t_pdus = conn->r2t_pdus_cnt; | |
778 | stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; | |
779 | stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; | |
780 | stats->digest_err = 0; | |
781 | stats->timeout_err = 0; | |
782 | stats->custom_length = 1; | |
783 | strcpy(stats->custom[0].desc, "eh_abort_cnt"); | |
784 | stats->custom[0].value = conn->eh_abort_cnt; | |
785 | } | |
786 | ||
787 | /** | |
788 | * cxgb3i_parse_itt - get the idx and age bits from a given tag | |
789 | * @conn: iscsi connection | |
790 | * @itt: itt tag | |
791 | * @idx: task index, filled in by this function | |
792 | * @age: session age, filled in by this function | |
793 | */ | |
794 | static void cxgb3i_parse_itt(struct iscsi_conn *conn, itt_t itt, | |
795 | int *idx, int *age) | |
796 | { | |
797 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
798 | struct cxgb3i_conn *cconn = tcp_conn->dd_data; | |
799 | struct cxgb3i_adapter *snic = cconn->hba->snic; | |
800 | u32 tag = ntohl((__force u32) itt); | |
801 | u32 sw_bits; | |
802 | ||
803 | sw_bits = cxgb3i_tag_nonrsvd_bits(&snic->tag_format, tag); | |
804 | if (idx) | |
805 | *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1); | |
806 | if (age) | |
807 | *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK; | |
808 | ||
809 | cxgb3i_tag_debug("parse tag 0x%x/0x%x, sw 0x%x, itt 0x%x, age 0x%x.\n", | |
810 | tag, itt, sw_bits, idx ? *idx : 0xFFFFF, | |
811 | age ? *age : 0xFF); | |
812 | } | |
813 | ||
814 | /** | |
815 | * cxgb3i_reserve_itt - generate tag for a give task | |
c3673464 KX |
816 | * @task: iscsi task |
817 | * @hdr_itt: tag, filled in by this function | |
154229a3 | 818 | * Set up ddp for scsi read tasks if possible. |
c3673464 KX |
819 | */ |
820 | int cxgb3i_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt) | |
821 | { | |
822 | struct scsi_cmnd *sc = task->sc; | |
823 | struct iscsi_conn *conn = task->conn; | |
824 | struct iscsi_session *sess = conn->session; | |
825 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
826 | struct cxgb3i_conn *cconn = tcp_conn->dd_data; | |
827 | struct cxgb3i_adapter *snic = cconn->hba->snic; | |
828 | struct cxgb3i_tag_format *tformat = &snic->tag_format; | |
829 | u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt; | |
830 | u32 tag; | |
831 | int err = -EINVAL; | |
832 | ||
833 | if (sc && | |
834 | (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) && | |
835 | cxgb3i_sw_tag_usable(tformat, sw_tag)) { | |
836 | struct s3_conn *c3cn = cconn->cep->c3cn; | |
837 | struct cxgb3i_gather_list *gl; | |
838 | ||
839 | gl = cxgb3i_ddp_make_gl(scsi_in(sc)->length, | |
840 | scsi_in(sc)->table.sgl, | |
841 | scsi_in(sc)->table.nents, | |
842 | snic->pdev, | |
843 | GFP_ATOMIC); | |
844 | if (gl) { | |
845 | tag = sw_tag; | |
846 | err = cxgb3i_ddp_tag_reserve(snic->tdev, c3cn->tid, | |
847 | tformat, &tag, | |
848 | gl, GFP_ATOMIC); | |
849 | if (err < 0) | |
850 | cxgb3i_ddp_release_gl(gl, snic->pdev); | |
851 | } | |
852 | } | |
853 | ||
854 | if (err < 0) | |
855 | tag = cxgb3i_set_non_ddp_tag(tformat, sw_tag); | |
856 | /* the itt need to sent in big-endian order */ | |
857 | *hdr_itt = (__force itt_t)htonl(tag); | |
858 | ||
859 | cxgb3i_tag_debug("new tag 0x%x/0x%x (itt 0x%x, age 0x%x).\n", | |
860 | tag, *hdr_itt, task->itt, sess->age); | |
861 | return 0; | |
862 | } | |
863 | ||
864 | /** | |
865 | * cxgb3i_release_itt - release the tag for a given task | |
c3673464 KX |
866 | * @task: iscsi task |
867 | * @hdr_itt: tag | |
154229a3 | 868 | * If the tag is a ddp tag, release the ddp setup |
c3673464 KX |
869 | */ |
870 | void cxgb3i_release_itt(struct iscsi_task *task, itt_t hdr_itt) | |
871 | { | |
872 | struct scsi_cmnd *sc = task->sc; | |
873 | struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data; | |
874 | struct cxgb3i_conn *cconn = tcp_conn->dd_data; | |
875 | struct cxgb3i_adapter *snic = cconn->hba->snic; | |
876 | struct cxgb3i_tag_format *tformat = &snic->tag_format; | |
877 | u32 tag = ntohl((__force u32)hdr_itt); | |
878 | ||
879 | cxgb3i_tag_debug("release tag 0x%x.\n", tag); | |
880 | ||
881 | if (sc && | |
882 | (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) && | |
883 | cxgb3i_is_ddp_tag(tformat, tag)) | |
884 | cxgb3i_ddp_tag_release(snic->tdev, tag); | |
885 | } | |
886 | ||
887 | /** | |
888 | * cxgb3i_host_template -- Scsi_Host_Template structure | |
889 | * used when registering with the scsi mid layer | |
890 | */ | |
891 | static struct scsi_host_template cxgb3i_host_template = { | |
892 | .module = THIS_MODULE, | |
893 | .name = "Chelsio S3xx iSCSI Initiator", | |
894 | .proc_name = "cxgb3i", | |
895 | .queuecommand = iscsi_queuecommand, | |
896 | .change_queue_depth = iscsi_change_queue_depth, | |
dd0af9f9 | 897 | .can_queue = CXGB3I_SCSI_HOST_QDEPTH, |
c3673464 KX |
898 | .sg_tablesize = SG_ALL, |
899 | .max_sectors = 0xFFFF, | |
dd0af9f9 | 900 | .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN, |
c3673464 KX |
901 | .eh_abort_handler = iscsi_eh_abort, |
902 | .eh_device_reset_handler = iscsi_eh_device_reset, | |
903 | .eh_target_reset_handler = iscsi_eh_target_reset, | |
6b5d6c44 | 904 | .target_alloc = iscsi_target_alloc, |
c3673464 KX |
905 | .use_clustering = DISABLE_CLUSTERING, |
906 | .this_id = -1, | |
907 | }; | |
908 | ||
909 | static struct iscsi_transport cxgb3i_iscsi_transport = { | |
910 | .owner = THIS_MODULE, | |
911 | .name = "cxgb3i", | |
912 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST | |
913 | | CAP_DATADGST | CAP_DIGEST_OFFLOAD | | |
914 | CAP_PADDING_OFFLOAD, | |
915 | .param_mask = ISCSI_MAX_RECV_DLENGTH | | |
916 | ISCSI_MAX_XMIT_DLENGTH | | |
917 | ISCSI_HDRDGST_EN | | |
918 | ISCSI_DATADGST_EN | | |
919 | ISCSI_INITIAL_R2T_EN | | |
920 | ISCSI_MAX_R2T | | |
921 | ISCSI_IMM_DATA_EN | | |
922 | ISCSI_FIRST_BURST | | |
923 | ISCSI_MAX_BURST | | |
924 | ISCSI_PDU_INORDER_EN | | |
925 | ISCSI_DATASEQ_INORDER_EN | | |
926 | ISCSI_ERL | | |
927 | ISCSI_CONN_PORT | | |
928 | ISCSI_CONN_ADDRESS | | |
929 | ISCSI_EXP_STATSN | | |
930 | ISCSI_PERSISTENT_PORT | | |
931 | ISCSI_PERSISTENT_ADDRESS | | |
932 | ISCSI_TARGET_NAME | ISCSI_TPGT | | |
933 | ISCSI_USERNAME | ISCSI_PASSWORD | | |
934 | ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN | | |
935 | ISCSI_FAST_ABORT | ISCSI_ABORT_TMO | | |
936 | ISCSI_LU_RESET_TMO | | |
937 | ISCSI_PING_TMO | ISCSI_RECV_TMO | | |
938 | ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME, | |
939 | .host_param_mask = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS | | |
940 | ISCSI_HOST_INITIATOR_NAME | ISCSI_HOST_NETDEV_NAME, | |
941 | .get_host_param = cxgb3i_host_get_param, | |
942 | .set_host_param = cxgb3i_host_set_param, | |
943 | /* session management */ | |
944 | .create_session = cxgb3i_session_create, | |
945 | .destroy_session = cxgb3i_session_destroy, | |
946 | .get_session_param = iscsi_session_get_param, | |
947 | /* connection management */ | |
948 | .create_conn = cxgb3i_conn_create, | |
949 | .bind_conn = cxgb3i_conn_bind, | |
950 | .destroy_conn = iscsi_tcp_conn_teardown, | |
951 | .start_conn = iscsi_conn_start, | |
952 | .stop_conn = iscsi_conn_stop, | |
953 | .get_conn_param = cxgb3i_conn_get_param, | |
954 | .set_param = cxgb3i_conn_set_param, | |
955 | .get_stats = cxgb3i_conn_get_stats, | |
956 | /* pdu xmit req. from user space */ | |
957 | .send_pdu = iscsi_conn_send_pdu, | |
958 | /* task */ | |
959 | .init_task = iscsi_tcp_task_init, | |
960 | .xmit_task = iscsi_tcp_task_xmit, | |
961 | .cleanup_task = cxgb3i_conn_cleanup_task, | |
962 | ||
963 | /* pdu */ | |
964 | .alloc_pdu = cxgb3i_conn_alloc_pdu, | |
965 | .init_pdu = cxgb3i_conn_init_pdu, | |
966 | .xmit_pdu = cxgb3i_conn_xmit_pdu, | |
967 | .parse_pdu_itt = cxgb3i_parse_itt, | |
968 | ||
969 | /* TCP connect/disconnect */ | |
970 | .ep_connect = cxgb3i_ep_connect, | |
971 | .ep_poll = cxgb3i_ep_poll, | |
972 | .ep_disconnect = cxgb3i_ep_disconnect, | |
973 | /* Error recovery timeout call */ | |
974 | .session_recovery_timedout = iscsi_session_recovery_timedout, | |
975 | }; | |
976 | ||
977 | int cxgb3i_iscsi_init(void) | |
978 | { | |
979 | sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1; | |
980 | sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1; | |
981 | cxgb3i_log_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n", | |
982 | ISCSI_ITT_MASK, sw_tag_idx_bits, | |
983 | ISCSI_AGE_MASK, sw_tag_age_bits); | |
984 | ||
985 | cxgb3i_scsi_transport = | |
986 | iscsi_register_transport(&cxgb3i_iscsi_transport); | |
987 | if (!cxgb3i_scsi_transport) { | |
988 | cxgb3i_log_error("Could not register cxgb3i transport.\n"); | |
989 | return -ENODEV; | |
990 | } | |
991 | cxgb3i_api_debug("cxgb3i transport 0x%p.\n", cxgb3i_scsi_transport); | |
992 | return 0; | |
993 | } | |
994 | ||
995 | void cxgb3i_iscsi_cleanup(void) | |
996 | { | |
997 | if (cxgb3i_scsi_transport) { | |
998 | cxgb3i_api_debug("cxgb3i transport 0x%p.\n", | |
999 | cxgb3i_scsi_transport); | |
1000 | iscsi_unregister_transport(&cxgb3i_iscsi_transport); | |
1001 | } | |
1002 | } |