[SCSI] cxgb3i: Add cxgb3i iSCSI driver.
[linux-2.6.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 <net/tcp.h>
17 #include <scsi/scsi_cmnd.h>
18 #include <scsi/scsi_device.h>
19 #include <scsi/scsi_eh.h>
20 #include <scsi/scsi_host.h>
21 #include <scsi/scsi.h>
22 #include <scsi/iscsi_proto.h>
23 #include <scsi/libiscsi.h>
24 #include <scsi/scsi_transport_iscsi.h>
25
26 #include "cxgb3i.h"
27 #include "cxgb3i_pdu.h"
28
29 #ifdef __DEBUG_CXGB3I_TAG__
30 #define cxgb3i_tag_debug        cxgb3i_log_debug
31 #else
32 #define cxgb3i_tag_debug(fmt...)
33 #endif
34
35 #ifdef __DEBUG_CXGB3I_API__
36 #define cxgb3i_api_debug        cxgb3i_log_debug
37 #else
38 #define cxgb3i_api_debug(fmt...)
39 #endif
40
41 /*
42  * align pdu size to multiple of 512 for better performance
43  */
44 #define align_pdu_size(n) do { n = (n) & (~511); } while (0)
45
46 static struct scsi_transport_template *cxgb3i_scsi_transport;
47 static struct scsi_host_template cxgb3i_host_template;
48 static struct iscsi_transport cxgb3i_iscsi_transport;
49 static unsigned char sw_tag_idx_bits;
50 static unsigned char sw_tag_age_bits;
51
52 static LIST_HEAD(cxgb3i_snic_list);
53 static DEFINE_RWLOCK(cxgb3i_snic_rwlock);
54
55 /**
56  * cxgb3i_adapter_add - init a s3 adapter structure and any h/w settings
57  * @t3dev: t3cdev adapter
58  * return the resulting cxgb3i_adapter struct
59  */
60 struct cxgb3i_adapter *cxgb3i_adapter_add(struct t3cdev *t3dev)
61 {
62         struct cxgb3i_adapter *snic;
63         struct adapter *adapter = tdev2adap(t3dev);
64         int i;
65
66         snic = kzalloc(sizeof(*snic), GFP_KERNEL);
67         if (!snic) {
68                 cxgb3i_api_debug("cxgb3 %s, OOM.\n", t3dev->name);
69                 return NULL;
70         }
71         spin_lock_init(&snic->lock);
72
73         snic->tdev = t3dev;
74         snic->pdev = adapter->pdev;
75         snic->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
76
77         if (cxgb3i_adapter_ddp_init(t3dev, &snic->tag_format,
78                                     &snic->tx_max_size,
79                                     &snic->rx_max_size) < 0)
80                 goto free_snic;
81
82         for_each_port(adapter, i) {
83                 snic->hba[i] = cxgb3i_hba_host_add(snic, adapter->port[i]);
84                 if (!snic->hba[i])
85                         goto ulp_cleanup;
86         }
87         snic->hba_cnt = adapter->params.nports;
88
89         /* add to the list */
90         write_lock(&cxgb3i_snic_rwlock);
91         list_add_tail(&snic->list_head, &cxgb3i_snic_list);
92         write_unlock(&cxgb3i_snic_rwlock);
93
94         return snic;
95
96 ulp_cleanup:
97         cxgb3i_adapter_ddp_cleanup(t3dev);
98 free_snic:
99         kfree(snic);
100         return NULL;
101 }
102
103 /**
104  * cxgb3i_adapter_remove - release all the resources held and cleanup any
105  *      h/w settings
106  * @t3dev: t3cdev adapter
107  */
108 void cxgb3i_adapter_remove(struct t3cdev *t3dev)
109 {
110         int i;
111         struct cxgb3i_adapter *snic;
112
113         /* remove from the list */
114         write_lock(&cxgb3i_snic_rwlock);
115         list_for_each_entry(snic, &cxgb3i_snic_list, list_head) {
116                 if (snic->tdev == t3dev) {
117                         list_del(&snic->list_head);
118                         break;
119                 }
120         }
121         write_unlock(&cxgb3i_snic_rwlock);
122
123         if (snic) {
124                 for (i = 0; i < snic->hba_cnt; i++) {
125                         if (snic->hba[i]) {
126                                 cxgb3i_hba_host_remove(snic->hba[i]);
127                                 snic->hba[i] = NULL;
128                         }
129                 }
130
131                 /* release ddp resources */
132                 cxgb3i_adapter_ddp_cleanup(snic->tdev);
133                 kfree(snic);
134         }
135 }
136
137 /**
138  * cxgb3i_hba_find_by_netdev - find the cxgb3i_hba structure with a given
139  *      net_device
140  * @t3dev: t3cdev adapter
141  */
142 struct cxgb3i_hba *cxgb3i_hba_find_by_netdev(struct net_device *ndev)
143 {
144         struct cxgb3i_adapter *snic;
145         int i;
146
147         read_lock(&cxgb3i_snic_rwlock);
148         list_for_each_entry(snic, &cxgb3i_snic_list, list_head) {
149                 for (i = 0; i < snic->hba_cnt; i++) {
150                         if (snic->hba[i]->ndev == ndev) {
151                                 read_unlock(&cxgb3i_snic_rwlock);
152                                 return snic->hba[i];
153                         }
154                 }
155         }
156         read_unlock(&cxgb3i_snic_rwlock);
157         return NULL;
158 }
159
160 /**
161  * cxgb3i_hba_host_add - register a new host with scsi/iscsi
162  * @snic: the cxgb3i adapter
163  * @ndev: associated net_device
164  */
165 struct cxgb3i_hba *cxgb3i_hba_host_add(struct cxgb3i_adapter *snic,
166                                        struct net_device *ndev)
167 {
168         struct cxgb3i_hba *hba;
169         struct Scsi_Host *shost;
170         int err;
171
172         shost = iscsi_host_alloc(&cxgb3i_host_template,
173                                  sizeof(struct cxgb3i_hba),
174                                  CXGB3I_SCSI_QDEPTH_DFLT);
175         if (!shost) {
176                 cxgb3i_log_info("iscsi_host_alloc failed.\n");
177                 return NULL;
178         }
179
180         shost->transportt = cxgb3i_scsi_transport;
181         shost->max_lun = CXGB3I_MAX_LUN;
182         shost->max_id = CXGB3I_MAX_TARGET;
183         shost->max_channel = 0;
184         shost->max_cmd_len = 16;
185
186         hba = iscsi_host_priv(shost);
187         hba->snic = snic;
188         hba->ndev = ndev;
189         hba->shost = shost;
190
191         pci_dev_get(snic->pdev);
192         err = iscsi_host_add(shost, &snic->pdev->dev);
193         if (err) {
194                 cxgb3i_log_info("iscsi_host_add failed.\n");
195                 goto pci_dev_put;
196         }
197
198         cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n",
199                          shost, hba, shost->host_no);
200
201         return hba;
202
203 pci_dev_put:
204         pci_dev_put(snic->pdev);
205         scsi_host_put(shost);
206         return NULL;
207 }
208
209 /**
210  * cxgb3i_hba_host_remove - de-register the host with scsi/iscsi
211  * @hba: the cxgb3i hba
212  */
213 void cxgb3i_hba_host_remove(struct cxgb3i_hba *hba)
214 {
215         cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n",
216                          hba->shost, hba, hba->shost->host_no);
217         iscsi_host_remove(hba->shost);
218         pci_dev_put(hba->snic->pdev);
219         iscsi_host_free(hba->shost);
220 }
221
222 /**
223  * cxgb3i_ep_connect - establish TCP connection to target portal
224  * @dst_addr:           target IP address
225  * @non_blocking:       blocking or non-blocking call
226  *
227  * Initiates a TCP/IP connection to the dst_addr
228  */
229 static struct iscsi_endpoint *cxgb3i_ep_connect(struct sockaddr *dst_addr,
230                                                 int non_blocking)
231 {
232         struct iscsi_endpoint *ep;
233         struct cxgb3i_endpoint *cep;
234         struct cxgb3i_hba *hba;
235         struct s3_conn *c3cn = NULL;
236         int err = 0;
237
238         c3cn = cxgb3i_c3cn_create();
239         if (!c3cn) {
240                 cxgb3i_log_info("ep connect OOM.\n");
241                 err = -ENOMEM;
242                 goto release_conn;
243         }
244
245         err = cxgb3i_c3cn_connect(c3cn, (struct sockaddr_in *)dst_addr);
246         if (err < 0) {
247                 cxgb3i_log_info("ep connect failed.\n");
248                 goto release_conn;
249         }
250         hba = cxgb3i_hba_find_by_netdev(c3cn->dst_cache->dev);
251         if (!hba) {
252                 err = -ENOSPC;
253                 cxgb3i_log_info("NOT going through cxgbi device.\n");
254                 goto release_conn;
255         }
256         if (c3cn_is_closing(c3cn)) {
257                 err = -ENOSPC;
258                 cxgb3i_log_info("ep connect unable to connect.\n");
259                 goto release_conn;
260         }
261
262         ep = iscsi_create_endpoint(sizeof(*cep));
263         if (!ep) {
264                 err = -ENOMEM;
265                 cxgb3i_log_info("iscsi alloc ep, OOM.\n");
266                 goto release_conn;
267         }
268         cep = ep->dd_data;
269         cep->c3cn = c3cn;
270         cep->hba = hba;
271
272         cxgb3i_api_debug("ep 0x%p, 0x%p, c3cn 0x%p, hba 0x%p.\n",
273                           ep, cep, c3cn, hba);
274         return ep;
275
276 release_conn:
277         cxgb3i_api_debug("conn 0x%p failed, release.\n", c3cn);
278         if (c3cn)
279                 cxgb3i_c3cn_release(c3cn);
280         return ERR_PTR(err);
281 }
282
283 /**
284  * cxgb3i_ep_poll - polls for TCP connection establishement
285  * @ep:         TCP connection (endpoint) handle
286  * @timeout_ms: timeout value in milli secs
287  *
288  * polls for TCP connect request to complete
289  */
290 static int cxgb3i_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
291 {
292         struct cxgb3i_endpoint *cep = ep->dd_data;
293         struct s3_conn *c3cn = cep->c3cn;
294
295         if (!c3cn_is_established(c3cn))
296                 return 0;
297         cxgb3i_api_debug("ep 0x%p, c3cn 0x%p established.\n", ep, c3cn);
298         return 1;
299 }
300
301 /**
302  * cxgb3i_ep_disconnect - teardown TCP connection
303  * @ep:         TCP connection (endpoint) handle
304  *
305  * teardown TCP connection
306  */
307 static void cxgb3i_ep_disconnect(struct iscsi_endpoint *ep)
308 {
309         struct cxgb3i_endpoint *cep = ep->dd_data;
310         struct cxgb3i_conn *cconn = cep->cconn;
311
312         cxgb3i_api_debug("ep 0x%p, cep 0x%p.\n", ep, cep);
313
314         if (cconn && cconn->conn) {
315                 /*
316                  * stop the xmit path so the xmit_pdu function is
317                  * not being called
318                  */
319                 iscsi_suspend_tx(cconn->conn);
320
321                 write_lock_bh(&cep->c3cn->callback_lock);
322                 cep->c3cn->user_data = NULL;
323                 cconn->cep = NULL;
324                 write_unlock_bh(&cep->c3cn->callback_lock);
325         }
326
327         cxgb3i_api_debug("ep 0x%p, cep 0x%p, release c3cn 0x%p.\n",
328                          ep, cep, cep->c3cn);
329         cxgb3i_c3cn_release(cep->c3cn);
330         iscsi_destroy_endpoint(ep);
331 }
332
333 /**
334  * cxgb3i_session_create - create a new iscsi session
335  * @cmds_max:           max # of commands
336  * @qdepth:             scsi queue depth
337  * @initial_cmdsn:      initial iscsi CMDSN for this session
338  * @host_no:            pointer to return host no
339  *
340  * Creates a new iSCSI session
341  */
342 static struct iscsi_cls_session *
343 cxgb3i_session_create(struct iscsi_endpoint *ep, u16 cmds_max, u16 qdepth,
344                       u32 initial_cmdsn, u32 *host_no)
345 {
346         struct cxgb3i_endpoint *cep;
347         struct cxgb3i_hba *hba;
348         struct Scsi_Host *shost;
349         struct iscsi_cls_session *cls_session;
350         struct iscsi_session *session;
351
352         if (!ep) {
353                 cxgb3i_log_error("%s, missing endpoint.\n", __func__);
354                 return NULL;
355         }
356
357         cep = ep->dd_data;
358         hba = cep->hba;
359         shost = hba->shost;
360         cxgb3i_api_debug("ep 0x%p, cep 0x%p, hba 0x%p.\n", ep, cep, hba);
361         BUG_ON(hba != iscsi_host_priv(shost));
362
363         *host_no = shost->host_no;
364
365         cls_session = iscsi_session_setup(&cxgb3i_iscsi_transport, shost,
366                                           cmds_max,
367                                           sizeof(struct iscsi_tcp_task),
368                                           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
377 remove_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  */
388 static 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  */
400 static 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  */
426 static 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  */
459 static 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
492 static 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  */
559 static 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  */
594 static 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  */
652 static 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  */
682 static 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  */
716 static 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  */
744 static 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  */
770 int 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  */
820 void 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  */
841 static 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
858 static 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
926 int 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
944 void 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 }