Merge branch 'fix/hda' into for-linus
[platform/adaptation/renesas_rcar/renesas_kernel.git] / drivers / scsi / cxgb3i / cxgb3i_iscsi.c
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 <linux/if_vlan.h>
17 #include <net/dst.h>
18 #include <net/tcp.h>
19 #include <scsi/scsi_cmnd.h>
20 #include <scsi/scsi_device.h>
21 #include <scsi/scsi_eh.h>
22 #include <scsi/scsi_host.h>
23 #include <scsi/scsi.h>
24 #include <scsi/iscsi_proto.h>
25 #include <scsi/libiscsi.h>
26 #include <scsi/scsi_transport_iscsi.h>
27
28 #include "cxgb3i.h"
29 #include "cxgb3i_pdu.h"
30
31 #ifdef __DEBUG_CXGB3I_TAG__
32 #define cxgb3i_tag_debug        cxgb3i_log_debug
33 #else
34 #define cxgb3i_tag_debug(fmt...)
35 #endif
36
37 #ifdef __DEBUG_CXGB3I_API__
38 #define cxgb3i_api_debug        cxgb3i_log_debug
39 #else
40 #define cxgb3i_api_debug(fmt...)
41 #endif
42
43 /*
44  * align pdu size to multiple of 512 for better performance
45  */
46 #define align_pdu_size(n) do { n = (n) & (~511); } while (0)
47
48 static struct scsi_transport_template *cxgb3i_scsi_transport;
49 static struct scsi_host_template cxgb3i_host_template;
50 static struct iscsi_transport cxgb3i_iscsi_transport;
51 static unsigned char sw_tag_idx_bits;
52 static unsigned char sw_tag_age_bits;
53
54 static LIST_HEAD(cxgb3i_snic_list);
55 static DEFINE_RWLOCK(cxgb3i_snic_rwlock);
56
57 /**
58  * cxgb3i_adpater_find_by_tdev - find the cxgb3i_adapter structure via t3cdev
59  * @tdev: t3cdev pointer
60  */
61 struct cxgb3i_adapter *cxgb3i_adapter_find_by_tdev(struct t3cdev *tdev)
62 {
63         struct cxgb3i_adapter *snic;
64
65         read_lock(&cxgb3i_snic_rwlock);
66         list_for_each_entry(snic, &cxgb3i_snic_list, list_head) {
67                 if (snic->tdev == tdev) {
68                         read_unlock(&cxgb3i_snic_rwlock);
69                         return snic;
70                 }
71         }
72         read_unlock(&cxgb3i_snic_rwlock);
73         return NULL;
74 }
75
76 static inline int adapter_update(struct cxgb3i_adapter *snic)
77 {
78         cxgb3i_log_info("snic 0x%p, t3dev 0x%p, updating.\n",
79                         snic, snic->tdev);
80         return cxgb3i_adapter_ddp_info(snic->tdev, &snic->tag_format,
81                                         &snic->tx_max_size,
82                                         &snic->rx_max_size);
83 }
84
85 static int adapter_add(struct cxgb3i_adapter *snic)
86 {
87         struct t3cdev *t3dev = snic->tdev;
88         struct adapter *adapter = tdev2adap(t3dev);
89         int i, err;
90
91         snic->pdev = adapter->pdev;
92         snic->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
93
94         err = cxgb3i_adapter_ddp_info(t3dev, &snic->tag_format,
95                                     &snic->tx_max_size,
96                                     &snic->rx_max_size);
97         if (err < 0)
98                 return err;
99
100         for_each_port(adapter, i) {
101                 snic->hba[i] = cxgb3i_hba_host_add(snic, adapter->port[i]);
102                 if (!snic->hba[i])
103                         return -EINVAL;
104         }
105         snic->hba_cnt = adapter->params.nports;
106
107         /* add to the list */
108         write_lock(&cxgb3i_snic_rwlock);
109         list_add_tail(&snic->list_head, &cxgb3i_snic_list);
110         write_unlock(&cxgb3i_snic_rwlock);
111
112         cxgb3i_log_info("t3dev 0x%p open, snic 0x%p, %u scsi hosts added.\n",
113                         t3dev, snic, snic->hba_cnt);
114         return 0;
115 }
116
117 /**
118  * cxgb3i_adapter_open - init a s3 adapter structure and any h/w settings
119  * @t3dev: t3cdev adapter
120  */
121 void cxgb3i_adapter_open(struct t3cdev *t3dev)
122 {
123         struct cxgb3i_adapter *snic = cxgb3i_adapter_find_by_tdev(t3dev);
124         int err;
125
126         if (snic)
127                 err = adapter_update(snic);
128         else {
129                 snic = kzalloc(sizeof(*snic), GFP_KERNEL);
130                 if (snic) {
131                         spin_lock_init(&snic->lock);
132                         snic->tdev = t3dev;
133                         err = adapter_add(snic);
134                 } else
135                         err = -ENOMEM;
136         }
137
138         if (err < 0) {
139                 cxgb3i_log_info("snic 0x%p, f 0x%x, t3dev 0x%p open, err %d.\n",
140                                 snic, snic ? snic->flags : 0, t3dev, err);
141                 if (snic) {
142                         snic->flags &= ~CXGB3I_ADAPTER_FLAG_RESET;
143                         cxgb3i_adapter_close(t3dev);
144                 }
145         }
146 }
147
148 /**
149  * cxgb3i_adapter_close - release the resources held and cleanup h/w settings
150  * @t3dev: t3cdev adapter
151  */
152 void cxgb3i_adapter_close(struct t3cdev *t3dev)
153 {
154         struct cxgb3i_adapter *snic = cxgb3i_adapter_find_by_tdev(t3dev);
155         int i;
156
157         if (!snic || snic->flags & CXGB3I_ADAPTER_FLAG_RESET) {
158                 cxgb3i_log_info("t3dev 0x%p close, snic 0x%p, f 0x%x.\n",
159                                 t3dev, snic, snic ? snic->flags : 0);
160                 return;
161         }
162
163         /* remove from the list */
164         write_lock(&cxgb3i_snic_rwlock);
165         list_del(&snic->list_head);
166         write_unlock(&cxgb3i_snic_rwlock);
167
168         for (i = 0; i < snic->hba_cnt; i++) {
169                 if (snic->hba[i]) {
170                         cxgb3i_hba_host_remove(snic->hba[i]);
171                         snic->hba[i] = NULL;
172                 }
173         }
174         cxgb3i_log_info("t3dev 0x%p close, snic 0x%p, %u scsi hosts removed.\n",
175                         t3dev, snic, snic->hba_cnt);
176         kfree(snic);
177 }
178
179 /**
180  * cxgb3i_hba_find_by_netdev - find the cxgb3i_hba structure via net_device
181  * @t3dev: t3cdev adapter
182  */
183 static struct cxgb3i_hba *cxgb3i_hba_find_by_netdev(struct net_device *ndev)
184 {
185         struct cxgb3i_adapter *snic;
186         int i;
187
188         if (ndev->priv_flags & IFF_802_1Q_VLAN)
189                 ndev = vlan_dev_real_dev(ndev);
190
191         read_lock(&cxgb3i_snic_rwlock);
192         list_for_each_entry(snic, &cxgb3i_snic_list, list_head) {
193                 for (i = 0; i < snic->hba_cnt; i++) {
194                         if (snic->hba[i]->ndev == ndev) {
195                                 read_unlock(&cxgb3i_snic_rwlock);
196                                 return snic->hba[i];
197                         }
198                 }
199         }
200         read_unlock(&cxgb3i_snic_rwlock);
201         return NULL;
202 }
203
204 /**
205  * cxgb3i_hba_host_add - register a new host with scsi/iscsi
206  * @snic: the cxgb3i adapter
207  * @ndev: associated net_device
208  */
209 struct cxgb3i_hba *cxgb3i_hba_host_add(struct cxgb3i_adapter *snic,
210                                        struct net_device *ndev)
211 {
212         struct cxgb3i_hba *hba;
213         struct Scsi_Host *shost;
214         int err;
215
216         shost = iscsi_host_alloc(&cxgb3i_host_template,
217                                  sizeof(struct cxgb3i_hba), 1);
218         if (!shost) {
219                 cxgb3i_log_info("snic 0x%p, ndev 0x%p, host_alloc failed.\n",
220                                 snic, ndev);
221                 return NULL;
222         }
223
224         shost->transportt = cxgb3i_scsi_transport;
225         shost->max_lun = CXGB3I_MAX_LUN;
226         shost->max_id = CXGB3I_MAX_TARGET;
227         shost->max_channel = 0;
228         shost->max_cmd_len = 16;
229
230         hba = iscsi_host_priv(shost);
231         hba->snic = snic;
232         hba->ndev = ndev;
233         hba->shost = shost;
234
235         pci_dev_get(snic->pdev);
236         err = iscsi_host_add(shost, &snic->pdev->dev);
237         if (err) {
238                 cxgb3i_log_info("snic 0x%p, ndev 0x%p, host_add failed.\n",
239                                 snic, ndev);
240                 goto pci_dev_put;
241         }
242
243         cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n",
244                          shost, hba, shost->host_no);
245
246         return hba;
247
248 pci_dev_put:
249         pci_dev_put(snic->pdev);
250         scsi_host_put(shost);
251         return NULL;
252 }
253
254 /**
255  * cxgb3i_hba_host_remove - de-register the host with scsi/iscsi
256  * @hba: the cxgb3i hba
257  */
258 void cxgb3i_hba_host_remove(struct cxgb3i_hba *hba)
259 {
260         cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n",
261                          hba->shost, hba, hba->shost->host_no);
262         iscsi_host_remove(hba->shost);
263         pci_dev_put(hba->snic->pdev);
264         iscsi_host_free(hba->shost);
265 }
266
267 /**
268  * cxgb3i_ep_connect - establish TCP connection to target portal
269  * @shost:              scsi host to use
270  * @dst_addr:           target IP address
271  * @non_blocking:       blocking or non-blocking call
272  *
273  * Initiates a TCP/IP connection to the dst_addr
274  */
275 static struct iscsi_endpoint *cxgb3i_ep_connect(struct Scsi_Host *shost,
276                                                 struct sockaddr *dst_addr,
277                                                 int non_blocking)
278 {
279         struct iscsi_endpoint *ep;
280         struct cxgb3i_endpoint *cep;
281         struct cxgb3i_hba *hba = NULL;
282         struct s3_conn *c3cn = NULL;
283         int err = 0;
284
285         if (shost)
286                 hba = iscsi_host_priv(shost);
287
288         cxgb3i_api_debug("shost 0x%p, hba 0x%p.\n", shost, hba);
289
290         c3cn = cxgb3i_c3cn_create();
291         if (!c3cn) {
292                 cxgb3i_log_info("ep connect OOM.\n");
293                 err = -ENOMEM;
294                 goto release_conn;
295         }
296
297         err = cxgb3i_c3cn_connect(hba ? hba->ndev : NULL, c3cn,
298                                  (struct sockaddr_in *)dst_addr);
299         if (err < 0) {
300                 cxgb3i_log_info("ep connect failed.\n");
301                 goto release_conn;
302         }
303
304         hba = cxgb3i_hba_find_by_netdev(c3cn->dst_cache->dev);
305         if (!hba) {
306                 err = -ENOSPC;
307                 cxgb3i_log_info("NOT going through cxgbi device.\n");
308                 goto release_conn;
309         }
310
311         if (shost && hba != iscsi_host_priv(shost)) {
312                 err = -ENOSPC;
313                 cxgb3i_log_info("Could not connect through request host%u\n",
314                                 shost->host_no);
315                 goto release_conn;
316         }
317
318         if (c3cn_is_closing(c3cn)) {
319                 err = -ENOSPC;
320                 cxgb3i_log_info("ep connect unable to connect.\n");
321                 goto release_conn;
322         }
323
324         ep = iscsi_create_endpoint(sizeof(*cep));
325         if (!ep) {
326                 err = -ENOMEM;
327                 cxgb3i_log_info("iscsi alloc ep, OOM.\n");
328                 goto release_conn;
329         }
330         cep = ep->dd_data;
331         cep->c3cn = c3cn;
332         cep->hba = hba;
333
334         cxgb3i_api_debug("ep 0x%p, 0x%p, c3cn 0x%p, hba 0x%p.\n",
335                           ep, cep, c3cn, hba);
336         return ep;
337
338 release_conn:
339         cxgb3i_api_debug("conn 0x%p failed, release.\n", c3cn);
340         if (c3cn)
341                 cxgb3i_c3cn_release(c3cn);
342         return ERR_PTR(err);
343 }
344
345 /**
346  * cxgb3i_ep_poll - polls for TCP connection establishement
347  * @ep:         TCP connection (endpoint) handle
348  * @timeout_ms: timeout value in milli secs
349  *
350  * polls for TCP connect request to complete
351  */
352 static int cxgb3i_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
353 {
354         struct cxgb3i_endpoint *cep = ep->dd_data;
355         struct s3_conn *c3cn = cep->c3cn;
356
357         if (!c3cn_is_established(c3cn))
358                 return 0;
359         cxgb3i_api_debug("ep 0x%p, c3cn 0x%p established.\n", ep, c3cn);
360         return 1;
361 }
362
363 /**
364  * cxgb3i_ep_disconnect - teardown TCP connection
365  * @ep:         TCP connection (endpoint) handle
366  *
367  * teardown TCP connection
368  */
369 static void cxgb3i_ep_disconnect(struct iscsi_endpoint *ep)
370 {
371         struct cxgb3i_endpoint *cep = ep->dd_data;
372         struct cxgb3i_conn *cconn = cep->cconn;
373
374         cxgb3i_api_debug("ep 0x%p, cep 0x%p.\n", ep, cep);
375
376         if (cconn && cconn->conn) {
377                 /*
378                  * stop the xmit path so the xmit_pdu function is
379                  * not being called
380                  */
381                 iscsi_suspend_tx(cconn->conn);
382
383                 write_lock_bh(&cep->c3cn->callback_lock);
384                 cep->c3cn->user_data = NULL;
385                 cconn->cep = NULL;
386                 write_unlock_bh(&cep->c3cn->callback_lock);
387         }
388
389         cxgb3i_api_debug("ep 0x%p, cep 0x%p, release c3cn 0x%p.\n",
390                          ep, cep, cep->c3cn);
391         cxgb3i_c3cn_release(cep->c3cn);
392         iscsi_destroy_endpoint(ep);
393 }
394
395 /**
396  * cxgb3i_session_create - create a new iscsi session
397  * @cmds_max:           max # of commands
398  * @qdepth:             scsi queue depth
399  * @initial_cmdsn:      initial iscsi CMDSN for this session
400  *
401  * Creates a new iSCSI session
402  */
403 static struct iscsi_cls_session *
404 cxgb3i_session_create(struct iscsi_endpoint *ep, u16 cmds_max, u16 qdepth,
405                       u32 initial_cmdsn)
406 {
407         struct cxgb3i_endpoint *cep;
408         struct cxgb3i_hba *hba;
409         struct Scsi_Host *shost;
410         struct iscsi_cls_session *cls_session;
411         struct iscsi_session *session;
412
413         if (!ep) {
414                 cxgb3i_log_error("%s, missing endpoint.\n", __func__);
415                 return NULL;
416         }
417
418         cep = ep->dd_data;
419         hba = cep->hba;
420         shost = hba->shost;
421         cxgb3i_api_debug("ep 0x%p, cep 0x%p, hba 0x%p.\n", ep, cep, hba);
422         BUG_ON(hba != iscsi_host_priv(shost));
423
424         cls_session = iscsi_session_setup(&cxgb3i_iscsi_transport, shost,
425                                           cmds_max,
426                                           sizeof(struct iscsi_tcp_task) +
427                                           sizeof(struct cxgb3i_task_data),
428                                           initial_cmdsn, ISCSI_MAX_TARGET);
429         if (!cls_session)
430                 return NULL;
431         session = cls_session->dd_data;
432         if (iscsi_tcp_r2tpool_alloc(session))
433                 goto remove_session;
434
435         return cls_session;
436
437 remove_session:
438         iscsi_session_teardown(cls_session);
439         return NULL;
440 }
441
442 /**
443  * cxgb3i_session_destroy - destroys iscsi session
444  * @cls_session:        pointer to iscsi cls session
445  *
446  * Destroys an iSCSI session instance and releases its all resources held
447  */
448 static void cxgb3i_session_destroy(struct iscsi_cls_session *cls_session)
449 {
450         cxgb3i_api_debug("sess 0x%p.\n", cls_session);
451         iscsi_tcp_r2tpool_free(cls_session->dd_data);
452         iscsi_session_teardown(cls_session);
453 }
454
455 /**
456  * cxgb3i_conn_max_xmit_dlength -- calc the max. xmit pdu segment size
457  * @conn: iscsi connection
458  * check the max. xmit pdu payload, reduce it if needed
459  */
460 static inline int cxgb3i_conn_max_xmit_dlength(struct iscsi_conn *conn)
461
462 {
463         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
464         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
465         unsigned int max = max(512 * MAX_SKB_FRAGS, SKB_TX_HEADROOM);
466
467         max = min(cconn->hba->snic->tx_max_size, max);
468         if (conn->max_xmit_dlength)
469                 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
470         else
471                 conn->max_xmit_dlength = max;
472         align_pdu_size(conn->max_xmit_dlength);
473         cxgb3i_api_debug("conn 0x%p, max xmit %u.\n",
474                          conn, conn->max_xmit_dlength);
475         return 0;
476 }
477
478 /**
479  * cxgb3i_conn_max_recv_dlength -- check the max. recv pdu segment size
480  * @conn: iscsi connection
481  * return 0 if the value is valid, < 0 otherwise.
482  */
483 static inline int cxgb3i_conn_max_recv_dlength(struct iscsi_conn *conn)
484 {
485         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
486         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
487         unsigned int max = cconn->hba->snic->rx_max_size;
488
489         align_pdu_size(max);
490         if (conn->max_recv_dlength) {
491                 if (conn->max_recv_dlength > max) {
492                         cxgb3i_log_error("MaxRecvDataSegmentLength %u too big."
493                                          " Need to be <= %u.\n",
494                                          conn->max_recv_dlength, max);
495                         return -EINVAL;
496                 }
497                 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
498                 align_pdu_size(conn->max_recv_dlength);
499         } else
500                 conn->max_recv_dlength = max;
501         cxgb3i_api_debug("conn 0x%p, max recv %u.\n",
502                          conn, conn->max_recv_dlength);
503         return 0;
504 }
505
506 /**
507  * cxgb3i_conn_create - create iscsi connection instance
508  * @cls_session:        pointer to iscsi cls session
509  * @cid:                iscsi cid
510  *
511  * Creates a new iSCSI connection instance for a given session
512  */
513 static struct iscsi_cls_conn *cxgb3i_conn_create(struct iscsi_cls_session
514                                                  *cls_session, u32 cid)
515 {
516         struct iscsi_cls_conn *cls_conn;
517         struct iscsi_conn *conn;
518         struct iscsi_tcp_conn *tcp_conn;
519         struct cxgb3i_conn *cconn;
520
521         cxgb3i_api_debug("sess 0x%p, cid %u.\n", cls_session, cid);
522
523         cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
524         if (!cls_conn)
525                 return NULL;
526         conn = cls_conn->dd_data;
527         tcp_conn = conn->dd_data;
528         cconn = tcp_conn->dd_data;
529
530         cconn->conn = conn;
531         return cls_conn;
532 }
533
534 /**
535  * cxgb3i_conn_bind - binds iscsi sess, conn and endpoint together
536  * @cls_session:        pointer to iscsi cls session
537  * @cls_conn:           pointer to iscsi cls conn
538  * @transport_eph:      64-bit EP handle
539  * @is_leading:         leading connection on this session?
540  *
541  * Binds together an iSCSI session, an iSCSI connection and a
542  *      TCP connection. This routine returns error code if the TCP
543  *      connection does not belong on the device iSCSI sess/conn is bound
544  */
545
546 static int cxgb3i_conn_bind(struct iscsi_cls_session *cls_session,
547                             struct iscsi_cls_conn *cls_conn,
548                             u64 transport_eph, int is_leading)
549 {
550         struct iscsi_conn *conn = cls_conn->dd_data;
551         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
552         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
553         struct cxgb3i_adapter *snic;
554         struct iscsi_endpoint *ep;
555         struct cxgb3i_endpoint *cep;
556         struct s3_conn *c3cn;
557         int err;
558
559         ep = iscsi_lookup_endpoint(transport_eph);
560         if (!ep)
561                 return -EINVAL;
562
563         /* setup ddp pagesize */
564         cep = ep->dd_data;
565         c3cn = cep->c3cn;
566         snic = cep->hba->snic;
567         err = cxgb3i_setup_conn_host_pagesize(snic->tdev, c3cn->tid, 0);
568         if (err < 0)
569                 return err;
570
571         cxgb3i_api_debug("ep 0x%p, cls sess 0x%p, cls conn 0x%p.\n",
572                          ep, cls_session, cls_conn);
573
574         err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
575         if (err)
576                 return -EINVAL;
577
578         /* calculate the tag idx bits needed for this conn based on cmds_max */
579         cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
580         cxgb3i_api_debug("session cmds_max 0x%x, bits %u.\n",
581                          conn->session->cmds_max, cconn->task_idx_bits);
582
583         read_lock(&c3cn->callback_lock);
584         c3cn->user_data = conn;
585         cconn->hba = cep->hba;
586         cconn->cep = cep;
587         cep->cconn = cconn;
588         read_unlock(&c3cn->callback_lock);
589
590         cxgb3i_conn_max_xmit_dlength(conn);
591         cxgb3i_conn_max_recv_dlength(conn);
592
593         spin_lock_bh(&conn->session->lock);
594         sprintf(conn->portal_address, NIPQUAD_FMT,
595                 NIPQUAD(c3cn->daddr.sin_addr.s_addr));
596         conn->portal_port = ntohs(c3cn->daddr.sin_port);
597         spin_unlock_bh(&conn->session->lock);
598
599         /* init recv engine */
600         iscsi_tcp_hdr_recv_prep(tcp_conn);
601
602         return 0;
603 }
604
605 /**
606  * cxgb3i_conn_get_param - return iscsi connection parameter to caller
607  * @cls_conn:   pointer to iscsi cls conn
608  * @param:      parameter type identifier
609  * @buf:        buffer pointer
610  *
611  * returns iSCSI connection parameters
612  */
613 static int cxgb3i_conn_get_param(struct iscsi_cls_conn *cls_conn,
614                                  enum iscsi_param param, char *buf)
615 {
616         struct iscsi_conn *conn = cls_conn->dd_data;
617         int len;
618
619         cxgb3i_api_debug("cls_conn 0x%p, param %d.\n", cls_conn, param);
620
621         switch (param) {
622         case ISCSI_PARAM_CONN_PORT:
623                 spin_lock_bh(&conn->session->lock);
624                 len = sprintf(buf, "%hu\n", conn->portal_port);
625                 spin_unlock_bh(&conn->session->lock);
626                 break;
627         case ISCSI_PARAM_CONN_ADDRESS:
628                 spin_lock_bh(&conn->session->lock);
629                 len = sprintf(buf, "%s\n", conn->portal_address);
630                 spin_unlock_bh(&conn->session->lock);
631                 break;
632         default:
633                 return iscsi_conn_get_param(cls_conn, param, buf);
634         }
635
636         return len;
637 }
638
639 /**
640  * cxgb3i_conn_set_param - set iscsi connection parameter
641  * @cls_conn:   pointer to iscsi cls conn
642  * @param:      parameter type identifier
643  * @buf:        buffer pointer
644  * @buflen:     buffer length
645  *
646  * set iSCSI connection parameters
647  */
648 static int cxgb3i_conn_set_param(struct iscsi_cls_conn *cls_conn,
649                                  enum iscsi_param param, char *buf, int buflen)
650 {
651         struct iscsi_conn *conn = cls_conn->dd_data;
652         struct iscsi_session *session = conn->session;
653         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
654         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
655         struct cxgb3i_adapter *snic = cconn->hba->snic;
656         struct s3_conn *c3cn = cconn->cep->c3cn;
657         int value, err = 0;
658
659         switch (param) {
660         case ISCSI_PARAM_HDRDGST_EN:
661                 err = iscsi_set_param(cls_conn, param, buf, buflen);
662                 if (!err && conn->hdrdgst_en)
663                         err = cxgb3i_setup_conn_digest(snic->tdev, c3cn->tid,
664                                                         conn->hdrdgst_en,
665                                                         conn->datadgst_en, 0);
666                 break;
667         case ISCSI_PARAM_DATADGST_EN:
668                 err = iscsi_set_param(cls_conn, param, buf, buflen);
669                 if (!err && conn->datadgst_en)
670                         err = cxgb3i_setup_conn_digest(snic->tdev, c3cn->tid,
671                                                         conn->hdrdgst_en,
672                                                         conn->datadgst_en, 0);
673                 break;
674         case ISCSI_PARAM_MAX_R2T:
675                 sscanf(buf, "%d", &value);
676                 if (value <= 0 || !is_power_of_2(value))
677                         return -EINVAL;
678                 if (session->max_r2t == value)
679                         break;
680                 iscsi_tcp_r2tpool_free(session);
681                 err = iscsi_set_param(cls_conn, param, buf, buflen);
682                 if (!err && iscsi_tcp_r2tpool_alloc(session))
683                         return -ENOMEM;
684         case ISCSI_PARAM_MAX_RECV_DLENGTH:
685                 err = iscsi_set_param(cls_conn, param, buf, buflen);
686                 if (!err)
687                         err = cxgb3i_conn_max_recv_dlength(conn);
688                 break;
689         case ISCSI_PARAM_MAX_XMIT_DLENGTH:
690                 err = iscsi_set_param(cls_conn, param, buf, buflen);
691                 if (!err)
692                         err = cxgb3i_conn_max_xmit_dlength(conn);
693                 break;
694         default:
695                 return iscsi_set_param(cls_conn, param, buf, buflen);
696         }
697         return err;
698 }
699
700 /**
701  * cxgb3i_host_set_param - configure host (adapter) related parameters
702  * @shost:      scsi host pointer
703  * @param:      parameter type identifier
704  * @buf:        buffer pointer
705  */
706 static int cxgb3i_host_set_param(struct Scsi_Host *shost,
707                                  enum iscsi_host_param param,
708                                  char *buf, int buflen)
709 {
710         struct cxgb3i_hba *hba = iscsi_host_priv(shost);
711
712         cxgb3i_api_debug("param %d, buf %s.\n", param, buf);
713
714         switch (param) {
715         case ISCSI_HOST_PARAM_IPADDRESS:
716         {
717                 __be32 addr = in_aton(buf);
718                 cxgb3i_set_private_ipv4addr(hba->ndev, addr);
719                 return 0;
720         }
721         case ISCSI_HOST_PARAM_HWADDRESS:
722         case ISCSI_HOST_PARAM_NETDEV_NAME:
723                 /* ignore */
724                 return 0;
725         default:
726                 return iscsi_host_set_param(shost, param, buf, buflen);
727         }
728 }
729
730 /**
731  * cxgb3i_host_get_param - returns host (adapter) related parameters
732  * @shost:      scsi host pointer
733  * @param:      parameter type identifier
734  * @buf:        buffer pointer
735  */
736 static int cxgb3i_host_get_param(struct Scsi_Host *shost,
737                                  enum iscsi_host_param param, char *buf)
738 {
739         struct cxgb3i_hba *hba = iscsi_host_priv(shost);
740         int len = 0;
741
742         cxgb3i_api_debug("hba %s, param %d.\n", hba->ndev->name, param);
743
744         switch (param) {
745         case ISCSI_HOST_PARAM_HWADDRESS:
746                 len = sysfs_format_mac(buf, hba->ndev->dev_addr, 6);
747                 break;
748         case ISCSI_HOST_PARAM_NETDEV_NAME:
749                 len = sprintf(buf, "%s\n", hba->ndev->name);
750                 break;
751         case ISCSI_HOST_PARAM_IPADDRESS:
752         {
753                 __be32 addr;
754
755                 addr = cxgb3i_get_private_ipv4addr(hba->ndev);
756                 len = sprintf(buf, NIPQUAD_FMT, NIPQUAD(addr));
757                 break;
758         }
759         default:
760                 return iscsi_host_get_param(shost, param, buf);
761         }
762         return len;
763 }
764
765 /**
766  * cxgb3i_conn_get_stats - returns iSCSI stats
767  * @cls_conn:   pointer to iscsi cls conn
768  * @stats:      pointer to iscsi statistic struct
769  */
770 static void cxgb3i_conn_get_stats(struct iscsi_cls_conn *cls_conn,
771                                   struct iscsi_stats *stats)
772 {
773         struct iscsi_conn *conn = cls_conn->dd_data;
774
775         stats->txdata_octets = conn->txdata_octets;
776         stats->rxdata_octets = conn->rxdata_octets;
777         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
778         stats->dataout_pdus = conn->dataout_pdus_cnt;
779         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
780         stats->datain_pdus = conn->datain_pdus_cnt;
781         stats->r2t_pdus = conn->r2t_pdus_cnt;
782         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
783         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
784         stats->digest_err = 0;
785         stats->timeout_err = 0;
786         stats->custom_length = 1;
787         strcpy(stats->custom[0].desc, "eh_abort_cnt");
788         stats->custom[0].value = conn->eh_abort_cnt;
789 }
790
791 /**
792  * cxgb3i_parse_itt - get the idx and age bits from a given tag
793  * @conn:       iscsi connection
794  * @itt:        itt tag
795  * @idx:        task index, filled in by this function
796  * @age:        session age, filled in by this function
797  */
798 static void cxgb3i_parse_itt(struct iscsi_conn *conn, itt_t itt,
799                              int *idx, int *age)
800 {
801         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
802         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
803         struct cxgb3i_adapter *snic = cconn->hba->snic;
804         u32 tag = ntohl((__force u32) itt);
805         u32 sw_bits;
806
807         sw_bits = cxgb3i_tag_nonrsvd_bits(&snic->tag_format, tag);
808         if (idx)
809                 *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
810         if (age)
811                 *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
812
813         cxgb3i_tag_debug("parse tag 0x%x/0x%x, sw 0x%x, itt 0x%x, age 0x%x.\n",
814                          tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
815                          age ? *age : 0xFF);
816 }
817
818 /**
819  * cxgb3i_reserve_itt - generate tag for a give task
820  * @task: iscsi task
821  * @hdr_itt: tag, filled in by this function
822  * Set up ddp for scsi read tasks if possible.
823  */
824 int cxgb3i_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
825 {
826         struct scsi_cmnd *sc = task->sc;
827         struct iscsi_conn *conn = task->conn;
828         struct iscsi_session *sess = conn->session;
829         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
830         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
831         struct cxgb3i_adapter *snic = cconn->hba->snic;
832         struct cxgb3i_tag_format *tformat = &snic->tag_format;
833         u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
834         u32 tag;
835         int err = -EINVAL;
836
837         if (sc &&
838             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
839             cxgb3i_sw_tag_usable(tformat, sw_tag)) {
840                 struct s3_conn *c3cn = cconn->cep->c3cn;
841                 struct cxgb3i_gather_list *gl;
842
843                 gl = cxgb3i_ddp_make_gl(scsi_in(sc)->length,
844                                         scsi_in(sc)->table.sgl,
845                                         scsi_in(sc)->table.nents,
846                                         snic->pdev,
847                                         GFP_ATOMIC);
848                 if (gl) {
849                         tag = sw_tag;
850                         err = cxgb3i_ddp_tag_reserve(snic->tdev, c3cn->tid,
851                                                      tformat, &tag,
852                                                      gl, GFP_ATOMIC);
853                         if (err < 0)
854                                 cxgb3i_ddp_release_gl(gl, snic->pdev);
855                 }
856         }
857
858         if (err < 0)
859                 tag = cxgb3i_set_non_ddp_tag(tformat, sw_tag);
860         /* the itt need to sent in big-endian order */
861         *hdr_itt = (__force itt_t)htonl(tag);
862
863         cxgb3i_tag_debug("new tag 0x%x/0x%x (itt 0x%x, age 0x%x).\n",
864                          tag, *hdr_itt, task->itt, sess->age);
865         return 0;
866 }
867
868 /**
869  * cxgb3i_release_itt - release the tag for a given task
870  * @task:       iscsi task
871  * @hdr_itt:    tag
872  * If the tag is a ddp tag, release the ddp setup
873  */
874 void cxgb3i_release_itt(struct iscsi_task *task, itt_t hdr_itt)
875 {
876         struct scsi_cmnd *sc = task->sc;
877         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
878         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
879         struct cxgb3i_adapter *snic = cconn->hba->snic;
880         struct cxgb3i_tag_format *tformat = &snic->tag_format;
881         u32 tag = ntohl((__force u32)hdr_itt);
882
883         cxgb3i_tag_debug("release tag 0x%x.\n", tag);
884
885         if (sc &&
886             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
887             cxgb3i_is_ddp_tag(tformat, tag))
888                 cxgb3i_ddp_tag_release(snic->tdev, tag);
889 }
890
891 /**
892  * cxgb3i_host_template -- Scsi_Host_Template structure
893  *      used when registering with the scsi mid layer
894  */
895 static struct scsi_host_template cxgb3i_host_template = {
896         .module                 = THIS_MODULE,
897         .name                   = "Chelsio S3xx iSCSI Initiator",
898         .proc_name              = "cxgb3i",
899         .queuecommand           = iscsi_queuecommand,
900         .change_queue_depth     = iscsi_change_queue_depth,
901         .can_queue              = CXGB3I_SCSI_HOST_QDEPTH,
902         .sg_tablesize           = SG_ALL,
903         .max_sectors            = 0xFFFF,
904         .cmd_per_lun            = ISCSI_DEF_CMD_PER_LUN,
905         .eh_abort_handler       = iscsi_eh_abort,
906         .eh_device_reset_handler = iscsi_eh_device_reset,
907         .eh_target_reset_handler = iscsi_eh_target_reset,
908         .target_alloc           = iscsi_target_alloc,
909         .use_clustering         = DISABLE_CLUSTERING,
910         .this_id                = -1,
911 };
912
913 static struct iscsi_transport cxgb3i_iscsi_transport = {
914         .owner                  = THIS_MODULE,
915         .name                   = "cxgb3i",
916         .caps                   = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
917                                 | CAP_DATADGST | CAP_DIGEST_OFFLOAD |
918                                 CAP_PADDING_OFFLOAD,
919         .param_mask             = ISCSI_MAX_RECV_DLENGTH |
920                                 ISCSI_MAX_XMIT_DLENGTH |
921                                 ISCSI_HDRDGST_EN |
922                                 ISCSI_DATADGST_EN |
923                                 ISCSI_INITIAL_R2T_EN |
924                                 ISCSI_MAX_R2T |
925                                 ISCSI_IMM_DATA_EN |
926                                 ISCSI_FIRST_BURST |
927                                 ISCSI_MAX_BURST |
928                                 ISCSI_PDU_INORDER_EN |
929                                 ISCSI_DATASEQ_INORDER_EN |
930                                 ISCSI_ERL |
931                                 ISCSI_CONN_PORT |
932                                 ISCSI_CONN_ADDRESS |
933                                 ISCSI_EXP_STATSN |
934                                 ISCSI_PERSISTENT_PORT |
935                                 ISCSI_PERSISTENT_ADDRESS |
936                                 ISCSI_TARGET_NAME | ISCSI_TPGT |
937                                 ISCSI_USERNAME | ISCSI_PASSWORD |
938                                 ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
939                                 ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
940                                 ISCSI_LU_RESET_TMO |
941                                 ISCSI_PING_TMO | ISCSI_RECV_TMO |
942                                 ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
943         .host_param_mask        = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
944                         ISCSI_HOST_INITIATOR_NAME | ISCSI_HOST_NETDEV_NAME,
945         .get_host_param         = cxgb3i_host_get_param,
946         .set_host_param         = cxgb3i_host_set_param,
947         /* session management */
948         .create_session         = cxgb3i_session_create,
949         .destroy_session        = cxgb3i_session_destroy,
950         .get_session_param      = iscsi_session_get_param,
951         /* connection management */
952         .create_conn            = cxgb3i_conn_create,
953         .bind_conn              = cxgb3i_conn_bind,
954         .destroy_conn           = iscsi_tcp_conn_teardown,
955         .start_conn             = iscsi_conn_start,
956         .stop_conn              = iscsi_conn_stop,
957         .get_conn_param         = cxgb3i_conn_get_param,
958         .set_param              = cxgb3i_conn_set_param,
959         .get_stats              = cxgb3i_conn_get_stats,
960         /* pdu xmit req. from user space */
961         .send_pdu               = iscsi_conn_send_pdu,
962         /* task */
963         .init_task              = iscsi_tcp_task_init,
964         .xmit_task              = iscsi_tcp_task_xmit,
965         .cleanup_task           = cxgb3i_conn_cleanup_task,
966
967         /* pdu */
968         .alloc_pdu              = cxgb3i_conn_alloc_pdu,
969         .init_pdu               = cxgb3i_conn_init_pdu,
970         .xmit_pdu               = cxgb3i_conn_xmit_pdu,
971         .parse_pdu_itt          = cxgb3i_parse_itt,
972
973         /* TCP connect/disconnect */
974         .ep_connect             = cxgb3i_ep_connect,
975         .ep_poll                = cxgb3i_ep_poll,
976         .ep_disconnect          = cxgb3i_ep_disconnect,
977         /* Error recovery timeout call */
978         .session_recovery_timedout = iscsi_session_recovery_timedout,
979 };
980
981 int cxgb3i_iscsi_init(void)
982 {
983         sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
984         sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
985         cxgb3i_log_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
986                         ISCSI_ITT_MASK, sw_tag_idx_bits,
987                         ISCSI_AGE_MASK, sw_tag_age_bits);
988
989         cxgb3i_scsi_transport =
990             iscsi_register_transport(&cxgb3i_iscsi_transport);
991         if (!cxgb3i_scsi_transport) {
992                 cxgb3i_log_error("Could not register cxgb3i transport.\n");
993                 return -ENODEV;
994         }
995         cxgb3i_api_debug("cxgb3i transport 0x%p.\n", cxgb3i_scsi_transport);
996         return 0;
997 }
998
999 void cxgb3i_iscsi_cleanup(void)
1000 {
1001         if (cxgb3i_scsi_transport) {
1002                 cxgb3i_api_debug("cxgb3i transport 0x%p.\n",
1003                                  cxgb3i_scsi_transport);
1004                 iscsi_unregister_transport(&cxgb3i_iscsi_transport);
1005         }
1006 }