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[mirror_ubuntu-artful-kernel.git] / drivers / scsi / cxgbi / libcxgbi.c
1 /*
2 * libcxgbi.c: Chelsio common library for T3/T4 iSCSI driver.
3 *
4 * Copyright (c) 2010 Chelsio Communications, Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation.
9 *
10 * Written by: Karen Xie (kxie@chelsio.com)
11 * Written by: Rakesh Ranjan (rranjan@chelsio.com)
12 */
13
14 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
15
16 #include <linux/skbuff.h>
17 #include <linux/crypto.h>
18 #include <linux/scatterlist.h>
19 #include <linux/pci.h>
20 #include <scsi/scsi.h>
21 #include <scsi/scsi_cmnd.h>
22 #include <scsi/scsi_host.h>
23 #include <linux/if_vlan.h>
24 #include <linux/inet.h>
25 #include <net/dst.h>
26 #include <net/route.h>
27 #include <linux/inetdevice.h> /* ip_dev_find */
28 #include <net/tcp.h>
29
30 static unsigned int dbg_level;
31
32 #include "libcxgbi.h"
33
34 #define DRV_MODULE_NAME "libcxgbi"
35 #define DRV_MODULE_DESC "Chelsio iSCSI driver library"
36 #define DRV_MODULE_VERSION "0.9.0"
37 #define DRV_MODULE_RELDATE "Jun. 2010"
38
39 MODULE_AUTHOR("Chelsio Communications, Inc.");
40 MODULE_DESCRIPTION(DRV_MODULE_DESC);
41 MODULE_VERSION(DRV_MODULE_VERSION);
42 MODULE_LICENSE("GPL");
43
44 module_param(dbg_level, uint, 0644);
45 MODULE_PARM_DESC(dbg_level, "libiscsi debug level (default=0)");
46
47
48 /*
49 * cxgbi device management
50 * maintains a list of the cxgbi devices
51 */
52 static LIST_HEAD(cdev_list);
53 static DEFINE_MUTEX(cdev_mutex);
54
55 int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
56 unsigned int max_conn)
57 {
58 struct cxgbi_ports_map *pmap = &cdev->pmap;
59
60 pmap->port_csk = cxgbi_alloc_big_mem(max_conn *
61 sizeof(struct cxgbi_sock *),
62 GFP_KERNEL);
63 if (!pmap->port_csk) {
64 pr_warn("cdev 0x%p, portmap OOM %u.\n", cdev, max_conn);
65 return -ENOMEM;
66 }
67
68 pmap->max_connect = max_conn;
69 pmap->sport_base = base;
70 spin_lock_init(&pmap->lock);
71 return 0;
72 }
73 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_create);
74
75 void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev)
76 {
77 struct cxgbi_ports_map *pmap = &cdev->pmap;
78 struct cxgbi_sock *csk;
79 int i;
80
81 for (i = 0; i < pmap->max_connect; i++) {
82 if (pmap->port_csk[i]) {
83 csk = pmap->port_csk[i];
84 pmap->port_csk[i] = NULL;
85 log_debug(1 << CXGBI_DBG_SOCK,
86 "csk 0x%p, cdev 0x%p, offload down.\n",
87 csk, cdev);
88 spin_lock_bh(&csk->lock);
89 cxgbi_sock_set_flag(csk, CTPF_OFFLOAD_DOWN);
90 cxgbi_sock_closed(csk);
91 spin_unlock_bh(&csk->lock);
92 cxgbi_sock_put(csk);
93 }
94 }
95 }
96 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_cleanup);
97
98 static inline void cxgbi_device_destroy(struct cxgbi_device *cdev)
99 {
100 log_debug(1 << CXGBI_DBG_DEV,
101 "cdev 0x%p, p# %u.\n", cdev, cdev->nports);
102 cxgbi_hbas_remove(cdev);
103 cxgbi_device_portmap_cleanup(cdev);
104 if (cdev->dev_ddp_cleanup)
105 cdev->dev_ddp_cleanup(cdev);
106 else
107 cxgbi_ddp_cleanup(cdev);
108 if (cdev->ddp)
109 cxgbi_ddp_cleanup(cdev);
110 if (cdev->pmap.max_connect)
111 cxgbi_free_big_mem(cdev->pmap.port_csk);
112 kfree(cdev);
113 }
114
115 struct cxgbi_device *cxgbi_device_register(unsigned int extra,
116 unsigned int nports)
117 {
118 struct cxgbi_device *cdev;
119
120 cdev = kzalloc(sizeof(*cdev) + extra + nports *
121 (sizeof(struct cxgbi_hba *) +
122 sizeof(struct net_device *)),
123 GFP_KERNEL);
124 if (!cdev) {
125 pr_warn("nport %d, OOM.\n", nports);
126 return NULL;
127 }
128 cdev->ports = (struct net_device **)(cdev + 1);
129 cdev->hbas = (struct cxgbi_hba **)(((char*)cdev->ports) + nports *
130 sizeof(struct net_device *));
131 if (extra)
132 cdev->dd_data = ((char *)cdev->hbas) +
133 nports * sizeof(struct cxgbi_hba *);
134 spin_lock_init(&cdev->pmap.lock);
135
136 mutex_lock(&cdev_mutex);
137 list_add_tail(&cdev->list_head, &cdev_list);
138 mutex_unlock(&cdev_mutex);
139
140 log_debug(1 << CXGBI_DBG_DEV,
141 "cdev 0x%p, p# %u.\n", cdev, nports);
142 return cdev;
143 }
144 EXPORT_SYMBOL_GPL(cxgbi_device_register);
145
146 void cxgbi_device_unregister(struct cxgbi_device *cdev)
147 {
148 log_debug(1 << CXGBI_DBG_DEV,
149 "cdev 0x%p, p# %u,%s.\n",
150 cdev, cdev->nports, cdev->nports ? cdev->ports[0]->name : "");
151 mutex_lock(&cdev_mutex);
152 list_del(&cdev->list_head);
153 mutex_unlock(&cdev_mutex);
154 cxgbi_device_destroy(cdev);
155 }
156 EXPORT_SYMBOL_GPL(cxgbi_device_unregister);
157
158 void cxgbi_device_unregister_all(unsigned int flag)
159 {
160 struct cxgbi_device *cdev, *tmp;
161
162 mutex_lock(&cdev_mutex);
163 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
164 if ((cdev->flags & flag) == flag) {
165 log_debug(1 << CXGBI_DBG_DEV,
166 "cdev 0x%p, p# %u,%s.\n",
167 cdev, cdev->nports, cdev->nports ?
168 cdev->ports[0]->name : "");
169 list_del(&cdev->list_head);
170 cxgbi_device_destroy(cdev);
171 }
172 }
173 mutex_unlock(&cdev_mutex);
174 }
175 EXPORT_SYMBOL_GPL(cxgbi_device_unregister_all);
176
177 struct cxgbi_device *cxgbi_device_find_by_lldev(void *lldev)
178 {
179 struct cxgbi_device *cdev, *tmp;
180
181 mutex_lock(&cdev_mutex);
182 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
183 if (cdev->lldev == lldev) {
184 mutex_unlock(&cdev_mutex);
185 return cdev;
186 }
187 }
188 mutex_unlock(&cdev_mutex);
189 log_debug(1 << CXGBI_DBG_DEV,
190 "lldev 0x%p, NO match found.\n", lldev);
191 return NULL;
192 }
193 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev);
194
195 static struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev,
196 int *port)
197 {
198 struct net_device *vdev = NULL;
199 struct cxgbi_device *cdev, *tmp;
200 int i;
201
202 if (ndev->priv_flags & IFF_802_1Q_VLAN) {
203 vdev = ndev;
204 ndev = vlan_dev_real_dev(ndev);
205 log_debug(1 << CXGBI_DBG_DEV,
206 "vlan dev %s -> %s.\n", vdev->name, ndev->name);
207 }
208
209 mutex_lock(&cdev_mutex);
210 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
211 for (i = 0; i < cdev->nports; i++) {
212 if (ndev == cdev->ports[i]) {
213 cdev->hbas[i]->vdev = vdev;
214 mutex_unlock(&cdev_mutex);
215 if (port)
216 *port = i;
217 return cdev;
218 }
219 }
220 }
221 mutex_unlock(&cdev_mutex);
222 log_debug(1 << CXGBI_DBG_DEV,
223 "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
224 return NULL;
225 }
226
227 void cxgbi_hbas_remove(struct cxgbi_device *cdev)
228 {
229 int i;
230 struct cxgbi_hba *chba;
231
232 log_debug(1 << CXGBI_DBG_DEV,
233 "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
234
235 for (i = 0; i < cdev->nports; i++) {
236 chba = cdev->hbas[i];
237 if (chba) {
238 cdev->hbas[i] = NULL;
239 iscsi_host_remove(chba->shost);
240 pci_dev_put(cdev->pdev);
241 iscsi_host_free(chba->shost);
242 }
243 }
244 }
245 EXPORT_SYMBOL_GPL(cxgbi_hbas_remove);
246
247 int cxgbi_hbas_add(struct cxgbi_device *cdev, unsigned int max_lun,
248 unsigned int max_id, struct scsi_host_template *sht,
249 struct scsi_transport_template *stt)
250 {
251 struct cxgbi_hba *chba;
252 struct Scsi_Host *shost;
253 int i, err;
254
255 log_debug(1 << CXGBI_DBG_DEV, "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
256
257 for (i = 0; i < cdev->nports; i++) {
258 shost = iscsi_host_alloc(sht, sizeof(*chba), 1);
259 if (!shost) {
260 pr_info("0x%p, p%d, %s, host alloc failed.\n",
261 cdev, i, cdev->ports[i]->name);
262 err = -ENOMEM;
263 goto err_out;
264 }
265
266 shost->transportt = stt;
267 shost->max_lun = max_lun;
268 shost->max_id = max_id;
269 shost->max_channel = 0;
270 shost->max_cmd_len = 16;
271
272 chba = iscsi_host_priv(shost);
273 chba->cdev = cdev;
274 chba->ndev = cdev->ports[i];
275 chba->shost = shost;
276
277 log_debug(1 << CXGBI_DBG_DEV,
278 "cdev 0x%p, p#%d %s: chba 0x%p.\n",
279 cdev, i, cdev->ports[i]->name, chba);
280
281 pci_dev_get(cdev->pdev);
282 err = iscsi_host_add(shost, &cdev->pdev->dev);
283 if (err) {
284 pr_info("cdev 0x%p, p#%d %s, host add failed.\n",
285 cdev, i, cdev->ports[i]->name);
286 pci_dev_put(cdev->pdev);
287 scsi_host_put(shost);
288 goto err_out;
289 }
290
291 cdev->hbas[i] = chba;
292 }
293
294 return 0;
295
296 err_out:
297 cxgbi_hbas_remove(cdev);
298 return err;
299 }
300 EXPORT_SYMBOL_GPL(cxgbi_hbas_add);
301
302 /*
303 * iSCSI offload
304 *
305 * - source port management
306 * To find a free source port in the port allocation map we use a very simple
307 * rotor scheme to look for the next free port.
308 *
309 * If a source port has been specified make sure that it doesn't collide with
310 * our normal source port allocation map. If it's outside the range of our
311 * allocation/deallocation scheme just let them use it.
312 *
313 * If the source port is outside our allocation range, the caller is
314 * responsible for keeping track of their port usage.
315 */
316 static int sock_get_port(struct cxgbi_sock *csk)
317 {
318 struct cxgbi_device *cdev = csk->cdev;
319 struct cxgbi_ports_map *pmap = &cdev->pmap;
320 unsigned int start;
321 int idx;
322
323 if (!pmap->max_connect) {
324 pr_err("cdev 0x%p, p#%u %s, NO port map.\n",
325 cdev, csk->port_id, cdev->ports[csk->port_id]->name);
326 return -EADDRNOTAVAIL;
327 }
328
329 if (csk->saddr.sin_port) {
330 pr_err("source port NON-ZERO %u.\n",
331 ntohs(csk->saddr.sin_port));
332 return -EADDRINUSE;
333 }
334
335 spin_lock_bh(&pmap->lock);
336 if (pmap->used >= pmap->max_connect) {
337 spin_unlock_bh(&pmap->lock);
338 pr_info("cdev 0x%p, p#%u %s, ALL ports used.\n",
339 cdev, csk->port_id, cdev->ports[csk->port_id]->name);
340 return -EADDRNOTAVAIL;
341 }
342
343 start = idx = pmap->next;
344 do {
345 if (++idx >= pmap->max_connect)
346 idx = 0;
347 if (!pmap->port_csk[idx]) {
348 pmap->used++;
349 csk->saddr.sin_port =
350 htons(pmap->sport_base + idx);
351 pmap->next = idx;
352 pmap->port_csk[idx] = csk;
353 spin_unlock_bh(&pmap->lock);
354 cxgbi_sock_get(csk);
355 log_debug(1 << CXGBI_DBG_SOCK,
356 "cdev 0x%p, p#%u %s, p %u, %u.\n",
357 cdev, csk->port_id,
358 cdev->ports[csk->port_id]->name,
359 pmap->sport_base + idx, pmap->next);
360 return 0;
361 }
362 } while (idx != start);
363 spin_unlock_bh(&pmap->lock);
364
365 /* should not happen */
366 pr_warn("cdev 0x%p, p#%u %s, next %u?\n",
367 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
368 pmap->next);
369 return -EADDRNOTAVAIL;
370 }
371
372 static void sock_put_port(struct cxgbi_sock *csk)
373 {
374 struct cxgbi_device *cdev = csk->cdev;
375 struct cxgbi_ports_map *pmap = &cdev->pmap;
376
377 if (csk->saddr.sin_port) {
378 int idx = ntohs(csk->saddr.sin_port) - pmap->sport_base;
379
380 csk->saddr.sin_port = 0;
381 if (idx < 0 || idx >= pmap->max_connect) {
382 pr_err("cdev 0x%p, p#%u %s, port %u OOR.\n",
383 cdev, csk->port_id,
384 cdev->ports[csk->port_id]->name,
385 ntohs(csk->saddr.sin_port));
386 return;
387 }
388
389 spin_lock_bh(&pmap->lock);
390 pmap->port_csk[idx] = NULL;
391 pmap->used--;
392 spin_unlock_bh(&pmap->lock);
393
394 log_debug(1 << CXGBI_DBG_SOCK,
395 "cdev 0x%p, p#%u %s, release %u.\n",
396 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
397 pmap->sport_base + idx);
398
399 cxgbi_sock_put(csk);
400 }
401 }
402
403 /*
404 * iscsi tcp connection
405 */
406 void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *csk)
407 {
408 if (csk->cpl_close) {
409 kfree_skb(csk->cpl_close);
410 csk->cpl_close = NULL;
411 }
412 if (csk->cpl_abort_req) {
413 kfree_skb(csk->cpl_abort_req);
414 csk->cpl_abort_req = NULL;
415 }
416 if (csk->cpl_abort_rpl) {
417 kfree_skb(csk->cpl_abort_rpl);
418 csk->cpl_abort_rpl = NULL;
419 }
420 }
421 EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs);
422
423 static struct cxgbi_sock *cxgbi_sock_create(struct cxgbi_device *cdev)
424 {
425 struct cxgbi_sock *csk = kzalloc(sizeof(*csk), GFP_NOIO);
426
427 if (!csk) {
428 pr_info("alloc csk %zu failed.\n", sizeof(*csk));
429 return NULL;
430 }
431
432 if (cdev->csk_alloc_cpls(csk) < 0) {
433 pr_info("csk 0x%p, alloc cpls failed.\n", csk);
434 kfree(csk);
435 return NULL;
436 }
437
438 spin_lock_init(&csk->lock);
439 kref_init(&csk->refcnt);
440 skb_queue_head_init(&csk->receive_queue);
441 skb_queue_head_init(&csk->write_queue);
442 setup_timer(&csk->retry_timer, NULL, (unsigned long)csk);
443 rwlock_init(&csk->callback_lock);
444 csk->cdev = cdev;
445 csk->flags = 0;
446 cxgbi_sock_set_state(csk, CTP_CLOSED);
447
448 log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk);
449
450 return csk;
451 }
452
453 static struct rtable *find_route_ipv4(__be32 saddr, __be32 daddr,
454 __be16 sport, __be16 dport, u8 tos)
455 {
456 struct rtable *rt;
457
458 rt = ip_route_output_ports(&init_net, NULL, daddr, saddr,
459 dport, sport, IPPROTO_TCP, tos, 0);
460 if (IS_ERR(rt))
461 return NULL;
462
463 return rt;
464 }
465
466 static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr)
467 {
468 struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
469 struct dst_entry *dst;
470 struct net_device *ndev;
471 struct cxgbi_device *cdev;
472 struct rtable *rt = NULL;
473 struct cxgbi_sock *csk = NULL;
474 unsigned int mtu = 0;
475 int port = 0xFFFF;
476 int err = 0;
477
478 if (daddr->sin_family != AF_INET) {
479 pr_info("address family 0x%x NOT supported.\n",
480 daddr->sin_family);
481 err = -EAFNOSUPPORT;
482 goto err_out;
483 }
484
485 rt = find_route_ipv4(0, daddr->sin_addr.s_addr, 0, daddr->sin_port, 0);
486 if (!rt) {
487 pr_info("no route to ipv4 0x%x, port %u.\n",
488 daddr->sin_addr.s_addr, daddr->sin_port);
489 err = -ENETUNREACH;
490 goto err_out;
491 }
492 dst = &rt->dst;
493 ndev = dst->neighbour->dev;
494
495 if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
496 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
497 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
498 ndev->name);
499 err = -ENETUNREACH;
500 goto rel_rt;
501 }
502
503 if (ndev->flags & IFF_LOOPBACK) {
504 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
505 mtu = ndev->mtu;
506 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
507 dst->neighbour->dev->name, ndev->name, mtu);
508 }
509
510 cdev = cxgbi_device_find_by_netdev(ndev, &port);
511 if (!cdev) {
512 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
513 &daddr->sin_addr.s_addr, ndev->name);
514 err = -ENETUNREACH;
515 goto rel_rt;
516 }
517 log_debug(1 << CXGBI_DBG_SOCK,
518 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
519 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
520 port, ndev->name, cdev);
521
522 csk = cxgbi_sock_create(cdev);
523 if (!csk) {
524 err = -ENOMEM;
525 goto rel_rt;
526 }
527 csk->cdev = cdev;
528 csk->port_id = port;
529 csk->mtu = mtu;
530 csk->dst = dst;
531 csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
532 csk->daddr.sin_port = daddr->sin_port;
533 csk->saddr.sin_addr.s_addr = rt->rt_src;
534
535 return csk;
536
537 rel_rt:
538 ip_rt_put(rt);
539 if (csk)
540 cxgbi_sock_closed(csk);
541 err_out:
542 return ERR_PTR(err);
543 }
544
545 void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
546 unsigned int opt)
547 {
548 csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
549 dst_confirm(csk->dst);
550 smp_mb();
551 cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
552 }
553 EXPORT_SYMBOL_GPL(cxgbi_sock_established);
554
555 static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
556 {
557 log_debug(1 << CXGBI_DBG_SOCK,
558 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
559 csk, csk->state, csk->flags, csk->user_data);
560
561 if (csk->state != CTP_ESTABLISHED) {
562 read_lock_bh(&csk->callback_lock);
563 if (csk->user_data)
564 iscsi_conn_failure(csk->user_data,
565 ISCSI_ERR_CONN_FAILED);
566 read_unlock_bh(&csk->callback_lock);
567 }
568 }
569
570 void cxgbi_sock_closed(struct cxgbi_sock *csk)
571 {
572 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
573 csk, (csk)->state, (csk)->flags, (csk)->tid);
574 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
575 if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
576 return;
577 if (csk->saddr.sin_port)
578 sock_put_port(csk);
579 if (csk->dst)
580 dst_release(csk->dst);
581 csk->cdev->csk_release_offload_resources(csk);
582 cxgbi_sock_set_state(csk, CTP_CLOSED);
583 cxgbi_inform_iscsi_conn_closing(csk);
584 cxgbi_sock_put(csk);
585 }
586 EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
587
588 static void need_active_close(struct cxgbi_sock *csk)
589 {
590 int data_lost;
591 int close_req = 0;
592
593 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
594 csk, (csk)->state, (csk)->flags, (csk)->tid);
595 spin_lock_bh(&csk->lock);
596 dst_confirm(csk->dst);
597 data_lost = skb_queue_len(&csk->receive_queue);
598 __skb_queue_purge(&csk->receive_queue);
599
600 if (csk->state == CTP_ACTIVE_OPEN)
601 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
602 else if (csk->state == CTP_ESTABLISHED) {
603 close_req = 1;
604 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
605 } else if (csk->state == CTP_PASSIVE_CLOSE) {
606 close_req = 1;
607 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
608 }
609
610 if (close_req) {
611 if (data_lost)
612 csk->cdev->csk_send_abort_req(csk);
613 else
614 csk->cdev->csk_send_close_req(csk);
615 }
616
617 spin_unlock_bh(&csk->lock);
618 }
619
620 void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
621 {
622 pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
623 csk, csk->state, csk->flags,
624 &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
625 &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
626 errno);
627
628 cxgbi_sock_set_state(csk, CTP_CONNECTING);
629 csk->err = errno;
630 cxgbi_sock_closed(csk);
631 }
632 EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
633
634 void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
635 {
636 struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
637
638 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
639 csk, (csk)->state, (csk)->flags, (csk)->tid);
640 cxgbi_sock_get(csk);
641 spin_lock_bh(&csk->lock);
642 if (csk->state == CTP_ACTIVE_OPEN)
643 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
644 spin_unlock_bh(&csk->lock);
645 cxgbi_sock_put(csk);
646 __kfree_skb(skb);
647 }
648 EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
649
650 void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
651 {
652 cxgbi_sock_get(csk);
653 spin_lock_bh(&csk->lock);
654 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
655 if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_RCVD))
656 cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
657 else {
658 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_RCVD);
659 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
660 if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
661 pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
662 csk, csk->state, csk->flags, csk->tid);
663 cxgbi_sock_closed(csk);
664 }
665 }
666 spin_unlock_bh(&csk->lock);
667 cxgbi_sock_put(csk);
668 }
669 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
670
671 void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
672 {
673 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
674 csk, (csk)->state, (csk)->flags, (csk)->tid);
675 cxgbi_sock_get(csk);
676 spin_lock_bh(&csk->lock);
677
678 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
679 goto done;
680
681 switch (csk->state) {
682 case CTP_ESTABLISHED:
683 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
684 break;
685 case CTP_ACTIVE_CLOSE:
686 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
687 break;
688 case CTP_CLOSE_WAIT_1:
689 cxgbi_sock_closed(csk);
690 break;
691 case CTP_ABORTING:
692 break;
693 default:
694 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
695 csk, csk->state, csk->flags, csk->tid);
696 }
697 cxgbi_inform_iscsi_conn_closing(csk);
698 done:
699 spin_unlock_bh(&csk->lock);
700 cxgbi_sock_put(csk);
701 }
702 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
703
704 void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
705 {
706 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
707 csk, (csk)->state, (csk)->flags, (csk)->tid);
708 cxgbi_sock_get(csk);
709 spin_lock_bh(&csk->lock);
710
711 csk->snd_una = snd_nxt - 1;
712 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
713 goto done;
714
715 switch (csk->state) {
716 case CTP_ACTIVE_CLOSE:
717 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
718 break;
719 case CTP_CLOSE_WAIT_1:
720 case CTP_CLOSE_WAIT_2:
721 cxgbi_sock_closed(csk);
722 break;
723 case CTP_ABORTING:
724 break;
725 default:
726 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
727 csk, csk->state, csk->flags, csk->tid);
728 }
729 done:
730 spin_unlock_bh(&csk->lock);
731 cxgbi_sock_put(csk);
732 }
733 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
734
735 void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
736 unsigned int snd_una, int seq_chk)
737 {
738 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
739 "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
740 csk, csk->state, csk->flags, csk->tid, credits,
741 csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
742
743 spin_lock_bh(&csk->lock);
744
745 csk->wr_cred += credits;
746 if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
747 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
748
749 while (credits) {
750 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
751
752 if (unlikely(!p)) {
753 pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
754 csk, csk->state, csk->flags, csk->tid, credits,
755 csk->wr_cred, csk->wr_una_cred);
756 break;
757 }
758
759 if (unlikely(credits < p->csum)) {
760 pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
761 csk, csk->state, csk->flags, csk->tid,
762 credits, csk->wr_cred, csk->wr_una_cred,
763 p->csum);
764 p->csum -= credits;
765 break;
766 } else {
767 cxgbi_sock_dequeue_wr(csk);
768 credits -= p->csum;
769 kfree_skb(p);
770 }
771 }
772
773 cxgbi_sock_check_wr_invariants(csk);
774
775 if (seq_chk) {
776 if (unlikely(before(snd_una, csk->snd_una))) {
777 pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
778 csk, csk->state, csk->flags, csk->tid, snd_una,
779 csk->snd_una);
780 goto done;
781 }
782
783 if (csk->snd_una != snd_una) {
784 csk->snd_una = snd_una;
785 dst_confirm(csk->dst);
786 }
787 }
788
789 if (skb_queue_len(&csk->write_queue)) {
790 if (csk->cdev->csk_push_tx_frames(csk, 0))
791 cxgbi_conn_tx_open(csk);
792 } else
793 cxgbi_conn_tx_open(csk);
794 done:
795 spin_unlock_bh(&csk->lock);
796 }
797 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
798
799 static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
800 unsigned short mtu)
801 {
802 int i = 0;
803
804 while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
805 ++i;
806
807 return i;
808 }
809
810 unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
811 {
812 unsigned int idx;
813 struct dst_entry *dst = csk->dst;
814
815 csk->advmss = dst_metric_advmss(dst);
816
817 if (csk->advmss > pmtu - 40)
818 csk->advmss = pmtu - 40;
819 if (csk->advmss < csk->cdev->mtus[0] - 40)
820 csk->advmss = csk->cdev->mtus[0] - 40;
821 idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
822
823 return idx;
824 }
825 EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
826
827 void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
828 {
829 cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
830 __skb_queue_tail(&csk->write_queue, skb);
831 }
832 EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
833
834 void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
835 {
836 struct sk_buff *skb;
837
838 while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
839 kfree_skb(skb);
840 }
841 EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
842
843 void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
844 {
845 int pending = cxgbi_sock_count_pending_wrs(csk);
846
847 if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
848 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
849 csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
850 }
851 EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
852
853 static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
854 {
855 struct cxgbi_device *cdev = csk->cdev;
856 struct sk_buff *next;
857 int err, copied = 0;
858
859 spin_lock_bh(&csk->lock);
860
861 if (csk->state != CTP_ESTABLISHED) {
862 log_debug(1 << CXGBI_DBG_PDU_TX,
863 "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
864 csk, csk->state, csk->flags, csk->tid);
865 err = -EAGAIN;
866 goto out_err;
867 }
868
869 if (csk->err) {
870 log_debug(1 << CXGBI_DBG_PDU_TX,
871 "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
872 csk, csk->state, csk->flags, csk->tid, csk->err);
873 err = -EPIPE;
874 goto out_err;
875 }
876
877 if (csk->write_seq - csk->snd_una >= cdev->snd_win) {
878 log_debug(1 << CXGBI_DBG_PDU_TX,
879 "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
880 csk, csk->state, csk->flags, csk->tid, csk->write_seq,
881 csk->snd_una, cdev->snd_win);
882 err = -ENOBUFS;
883 goto out_err;
884 }
885
886 while (skb) {
887 int frags = skb_shinfo(skb)->nr_frags +
888 (skb->len != skb->data_len);
889
890 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
891 pr_err("csk 0x%p, skb head %u < %u.\n",
892 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
893 err = -EINVAL;
894 goto out_err;
895 }
896
897 if (frags >= SKB_WR_LIST_SIZE) {
898 pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
899 csk, skb_shinfo(skb)->nr_frags, skb->len,
900 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
901 err = -EINVAL;
902 goto out_err;
903 }
904
905 next = skb->next;
906 skb->next = NULL;
907 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
908 cxgbi_sock_skb_entail(csk, skb);
909 copied += skb->len;
910 csk->write_seq += skb->len +
911 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
912 skb = next;
913 }
914 done:
915 if (likely(skb_queue_len(&csk->write_queue)))
916 cdev->csk_push_tx_frames(csk, 1);
917 spin_unlock_bh(&csk->lock);
918 return copied;
919
920 out_err:
921 if (copied == 0 && err == -EPIPE)
922 copied = csk->err ? csk->err : -EPIPE;
923 else
924 copied = err;
925 goto done;
926 }
927
928 /*
929 * Direct Data Placement -
930 * Directly place the iSCSI Data-In or Data-Out PDU's payload into pre-posted
931 * final destination host-memory buffers based on the Initiator Task Tag (ITT)
932 * in Data-In or Target Task Tag (TTT) in Data-Out PDUs.
933 * The host memory address is programmed into h/w in the format of pagepod
934 * entries.
935 * The location of the pagepod entry is encoded into ddp tag which is used as
936 * the base for ITT/TTT.
937 */
938
939 static unsigned char ddp_page_order[DDP_PGIDX_MAX] = {0, 1, 2, 4};
940 static unsigned char ddp_page_shift[DDP_PGIDX_MAX] = {12, 13, 14, 16};
941 static unsigned char page_idx = DDP_PGIDX_MAX;
942
943 static unsigned char sw_tag_idx_bits;
944 static unsigned char sw_tag_age_bits;
945
946 /*
947 * Direct-Data Placement page size adjustment
948 */
949 static int ddp_adjust_page_table(void)
950 {
951 int i;
952 unsigned int base_order, order;
953
954 if (PAGE_SIZE < (1UL << ddp_page_shift[0])) {
955 pr_info("PAGE_SIZE 0x%lx too small, min 0x%lx\n",
956 PAGE_SIZE, 1UL << ddp_page_shift[0]);
957 return -EINVAL;
958 }
959
960 base_order = get_order(1UL << ddp_page_shift[0]);
961 order = get_order(1UL << PAGE_SHIFT);
962
963 for (i = 0; i < DDP_PGIDX_MAX; i++) {
964 /* first is the kernel page size, then just doubling */
965 ddp_page_order[i] = order - base_order + i;
966 ddp_page_shift[i] = PAGE_SHIFT + i;
967 }
968 return 0;
969 }
970
971 static int ddp_find_page_index(unsigned long pgsz)
972 {
973 int i;
974
975 for (i = 0; i < DDP_PGIDX_MAX; i++) {
976 if (pgsz == (1UL << ddp_page_shift[i]))
977 return i;
978 }
979 pr_info("ddp page size %lu not supported.\n", pgsz);
980 return DDP_PGIDX_MAX;
981 }
982
983 static void ddp_setup_host_page_size(void)
984 {
985 if (page_idx == DDP_PGIDX_MAX) {
986 page_idx = ddp_find_page_index(PAGE_SIZE);
987
988 if (page_idx == DDP_PGIDX_MAX) {
989 pr_info("system PAGE %lu, update hw.\n", PAGE_SIZE);
990 if (ddp_adjust_page_table() < 0) {
991 pr_info("PAGE %lu, disable ddp.\n", PAGE_SIZE);
992 return;
993 }
994 page_idx = ddp_find_page_index(PAGE_SIZE);
995 }
996 pr_info("system PAGE %lu, ddp idx %u.\n", PAGE_SIZE, page_idx);
997 }
998 }
999
1000 void cxgbi_ddp_page_size_factor(int *pgsz_factor)
1001 {
1002 int i;
1003
1004 for (i = 0; i < DDP_PGIDX_MAX; i++)
1005 pgsz_factor[i] = ddp_page_order[i];
1006 }
1007 EXPORT_SYMBOL_GPL(cxgbi_ddp_page_size_factor);
1008
1009 /*
1010 * DDP setup & teardown
1011 */
1012
1013 void cxgbi_ddp_ppod_set(struct cxgbi_pagepod *ppod,
1014 struct cxgbi_pagepod_hdr *hdr,
1015 struct cxgbi_gather_list *gl, unsigned int gidx)
1016 {
1017 int i;
1018
1019 memcpy(ppod, hdr, sizeof(*hdr));
1020 for (i = 0; i < (PPOD_PAGES_MAX + 1); i++, gidx++) {
1021 ppod->addr[i] = gidx < gl->nelem ?
1022 cpu_to_be64(gl->phys_addr[gidx]) : 0ULL;
1023 }
1024 }
1025 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_set);
1026
1027 void cxgbi_ddp_ppod_clear(struct cxgbi_pagepod *ppod)
1028 {
1029 memset(ppod, 0, sizeof(*ppod));
1030 }
1031 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_clear);
1032
1033 static inline int ddp_find_unused_entries(struct cxgbi_ddp_info *ddp,
1034 unsigned int start, unsigned int max,
1035 unsigned int count,
1036 struct cxgbi_gather_list *gl)
1037 {
1038 unsigned int i, j, k;
1039
1040 /* not enough entries */
1041 if ((max - start) < count) {
1042 log_debug(1 << CXGBI_DBG_DDP,
1043 "NOT enough entries %u+%u < %u.\n", start, count, max);
1044 return -EBUSY;
1045 }
1046
1047 max -= count;
1048 spin_lock(&ddp->map_lock);
1049 for (i = start; i < max;) {
1050 for (j = 0, k = i; j < count; j++, k++) {
1051 if (ddp->gl_map[k])
1052 break;
1053 }
1054 if (j == count) {
1055 for (j = 0, k = i; j < count; j++, k++)
1056 ddp->gl_map[k] = gl;
1057 spin_unlock(&ddp->map_lock);
1058 return i;
1059 }
1060 i += j + 1;
1061 }
1062 spin_unlock(&ddp->map_lock);
1063 log_debug(1 << CXGBI_DBG_DDP,
1064 "NO suitable entries %u available.\n", count);
1065 return -EBUSY;
1066 }
1067
1068 static inline void ddp_unmark_entries(struct cxgbi_ddp_info *ddp,
1069 int start, int count)
1070 {
1071 spin_lock(&ddp->map_lock);
1072 memset(&ddp->gl_map[start], 0,
1073 count * sizeof(struct cxgbi_gather_list *));
1074 spin_unlock(&ddp->map_lock);
1075 }
1076
1077 static inline void ddp_gl_unmap(struct pci_dev *pdev,
1078 struct cxgbi_gather_list *gl)
1079 {
1080 int i;
1081
1082 for (i = 0; i < gl->nelem; i++)
1083 dma_unmap_page(&pdev->dev, gl->phys_addr[i], PAGE_SIZE,
1084 PCI_DMA_FROMDEVICE);
1085 }
1086
1087 static inline int ddp_gl_map(struct pci_dev *pdev,
1088 struct cxgbi_gather_list *gl)
1089 {
1090 int i;
1091
1092 for (i = 0; i < gl->nelem; i++) {
1093 gl->phys_addr[i] = dma_map_page(&pdev->dev, gl->pages[i], 0,
1094 PAGE_SIZE,
1095 PCI_DMA_FROMDEVICE);
1096 if (unlikely(dma_mapping_error(&pdev->dev, gl->phys_addr[i]))) {
1097 log_debug(1 << CXGBI_DBG_DDP,
1098 "page %d 0x%p, 0x%p dma mapping err.\n",
1099 i, gl->pages[i], pdev);
1100 goto unmap;
1101 }
1102 }
1103 return i;
1104 unmap:
1105 if (i) {
1106 unsigned int nelem = gl->nelem;
1107
1108 gl->nelem = i;
1109 ddp_gl_unmap(pdev, gl);
1110 gl->nelem = nelem;
1111 }
1112 return -EINVAL;
1113 }
1114
1115 static void ddp_release_gl(struct cxgbi_gather_list *gl,
1116 struct pci_dev *pdev)
1117 {
1118 ddp_gl_unmap(pdev, gl);
1119 kfree(gl);
1120 }
1121
1122 static struct cxgbi_gather_list *ddp_make_gl(unsigned int xferlen,
1123 struct scatterlist *sgl,
1124 unsigned int sgcnt,
1125 struct pci_dev *pdev,
1126 gfp_t gfp)
1127 {
1128 struct cxgbi_gather_list *gl;
1129 struct scatterlist *sg = sgl;
1130 struct page *sgpage = sg_page(sg);
1131 unsigned int sglen = sg->length;
1132 unsigned int sgoffset = sg->offset;
1133 unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >>
1134 PAGE_SHIFT;
1135 int i = 1, j = 0;
1136
1137 if (xferlen < DDP_THRESHOLD) {
1138 log_debug(1 << CXGBI_DBG_DDP,
1139 "xfer %u < threshold %u, no ddp.\n",
1140 xferlen, DDP_THRESHOLD);
1141 return NULL;
1142 }
1143
1144 gl = kzalloc(sizeof(struct cxgbi_gather_list) +
1145 npages * (sizeof(dma_addr_t) +
1146 sizeof(struct page *)), gfp);
1147 if (!gl) {
1148 log_debug(1 << CXGBI_DBG_DDP,
1149 "xfer %u, %u pages, OOM.\n", xferlen, npages);
1150 return NULL;
1151 }
1152
1153 log_debug(1 << CXGBI_DBG_DDP,
1154 "xfer %u, sgl %u, gl max %u.\n", xferlen, sgcnt, npages);
1155
1156 gl->pages = (struct page **)&gl->phys_addr[npages];
1157 gl->nelem = npages;
1158 gl->length = xferlen;
1159 gl->offset = sgoffset;
1160 gl->pages[0] = sgpage;
1161
1162 for (i = 1, sg = sg_next(sgl), j = 0; i < sgcnt;
1163 i++, sg = sg_next(sg)) {
1164 struct page *page = sg_page(sg);
1165
1166 if (sgpage == page && sg->offset == sgoffset + sglen)
1167 sglen += sg->length;
1168 else {
1169 /* make sure the sgl is fit for ddp:
1170 * each has the same page size, and
1171 * all of the middle pages are used completely
1172 */
1173 if ((j && sgoffset) || ((i != sgcnt - 1) &&
1174 ((sglen + sgoffset) & ~PAGE_MASK))) {
1175 log_debug(1 << CXGBI_DBG_DDP,
1176 "page %d/%u, %u + %u.\n",
1177 i, sgcnt, sgoffset, sglen);
1178 goto error_out;
1179 }
1180
1181 j++;
1182 if (j == gl->nelem || sg->offset) {
1183 log_debug(1 << CXGBI_DBG_DDP,
1184 "page %d/%u, offset %u.\n",
1185 j, gl->nelem, sg->offset);
1186 goto error_out;
1187 }
1188 gl->pages[j] = page;
1189 sglen = sg->length;
1190 sgoffset = sg->offset;
1191 sgpage = page;
1192 }
1193 }
1194 gl->nelem = ++j;
1195
1196 if (ddp_gl_map(pdev, gl) < 0)
1197 goto error_out;
1198
1199 return gl;
1200
1201 error_out:
1202 kfree(gl);
1203 return NULL;
1204 }
1205
1206 static void ddp_tag_release(struct cxgbi_hba *chba, u32 tag)
1207 {
1208 struct cxgbi_device *cdev = chba->cdev;
1209 struct cxgbi_ddp_info *ddp = cdev->ddp;
1210 u32 idx;
1211
1212 idx = (tag >> PPOD_IDX_SHIFT) & ddp->idx_mask;
1213 if (idx < ddp->nppods) {
1214 struct cxgbi_gather_list *gl = ddp->gl_map[idx];
1215 unsigned int npods;
1216
1217 if (!gl || !gl->nelem) {
1218 pr_warn("tag 0x%x, idx %u, gl 0x%p, %u.\n",
1219 tag, idx, gl, gl ? gl->nelem : 0);
1220 return;
1221 }
1222 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1223 log_debug(1 << CXGBI_DBG_DDP,
1224 "tag 0x%x, release idx %u, npods %u.\n",
1225 tag, idx, npods);
1226 cdev->csk_ddp_clear(chba, tag, idx, npods);
1227 ddp_unmark_entries(ddp, idx, npods);
1228 ddp_release_gl(gl, ddp->pdev);
1229 } else
1230 pr_warn("tag 0x%x, idx %u > max %u.\n", tag, idx, ddp->nppods);
1231 }
1232
1233 static int ddp_tag_reserve(struct cxgbi_sock *csk, unsigned int tid,
1234 u32 sw_tag, u32 *tagp, struct cxgbi_gather_list *gl,
1235 gfp_t gfp)
1236 {
1237 struct cxgbi_device *cdev = csk->cdev;
1238 struct cxgbi_ddp_info *ddp = cdev->ddp;
1239 struct cxgbi_tag_format *tformat = &cdev->tag_format;
1240 struct cxgbi_pagepod_hdr hdr;
1241 unsigned int npods;
1242 int idx = -1;
1243 int err = -ENOMEM;
1244 u32 tag;
1245
1246 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1247 if (ddp->idx_last == ddp->nppods)
1248 idx = ddp_find_unused_entries(ddp, 0, ddp->nppods,
1249 npods, gl);
1250 else {
1251 idx = ddp_find_unused_entries(ddp, ddp->idx_last + 1,
1252 ddp->nppods, npods,
1253 gl);
1254 if (idx < 0 && ddp->idx_last >= npods) {
1255 idx = ddp_find_unused_entries(ddp, 0,
1256 min(ddp->idx_last + npods, ddp->nppods),
1257 npods, gl);
1258 }
1259 }
1260 if (idx < 0) {
1261 log_debug(1 << CXGBI_DBG_DDP,
1262 "xferlen %u, gl %u, npods %u NO DDP.\n",
1263 gl->length, gl->nelem, npods);
1264 return idx;
1265 }
1266
1267 if (cdev->csk_ddp_alloc_gl_skb) {
1268 err = cdev->csk_ddp_alloc_gl_skb(ddp, idx, npods, gfp);
1269 if (err < 0)
1270 goto unmark_entries;
1271 }
1272
1273 tag = cxgbi_ddp_tag_base(tformat, sw_tag);
1274 tag |= idx << PPOD_IDX_SHIFT;
1275
1276 hdr.rsvd = 0;
1277 hdr.vld_tid = htonl(PPOD_VALID_FLAG | PPOD_TID(tid));
1278 hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask);
1279 hdr.max_offset = htonl(gl->length);
1280 hdr.page_offset = htonl(gl->offset);
1281
1282 err = cdev->csk_ddp_set(csk, &hdr, idx, npods, gl);
1283 if (err < 0) {
1284 if (cdev->csk_ddp_free_gl_skb)
1285 cdev->csk_ddp_free_gl_skb(ddp, idx, npods);
1286 goto unmark_entries;
1287 }
1288
1289 ddp->idx_last = idx;
1290 log_debug(1 << CXGBI_DBG_DDP,
1291 "xfer %u, gl %u,%u, tid 0x%x, tag 0x%x->0x%x(%u,%u).\n",
1292 gl->length, gl->nelem, gl->offset, tid, sw_tag, tag, idx,
1293 npods);
1294 *tagp = tag;
1295 return 0;
1296
1297 unmark_entries:
1298 ddp_unmark_entries(ddp, idx, npods);
1299 return err;
1300 }
1301
1302 int cxgbi_ddp_reserve(struct cxgbi_sock *csk, unsigned int *tagp,
1303 unsigned int sw_tag, unsigned int xferlen,
1304 struct scatterlist *sgl, unsigned int sgcnt, gfp_t gfp)
1305 {
1306 struct cxgbi_device *cdev = csk->cdev;
1307 struct cxgbi_tag_format *tformat = &cdev->tag_format;
1308 struct cxgbi_gather_list *gl;
1309 int err;
1310
1311 if (page_idx >= DDP_PGIDX_MAX || !cdev->ddp ||
1312 xferlen < DDP_THRESHOLD) {
1313 log_debug(1 << CXGBI_DBG_DDP,
1314 "pgidx %u, xfer %u, NO ddp.\n", page_idx, xferlen);
1315 return -EINVAL;
1316 }
1317
1318 if (!cxgbi_sw_tag_usable(tformat, sw_tag)) {
1319 log_debug(1 << CXGBI_DBG_DDP,
1320 "sw_tag 0x%x NOT usable.\n", sw_tag);
1321 return -EINVAL;
1322 }
1323
1324 gl = ddp_make_gl(xferlen, sgl, sgcnt, cdev->pdev, gfp);
1325 if (!gl)
1326 return -ENOMEM;
1327
1328 err = ddp_tag_reserve(csk, csk->tid, sw_tag, tagp, gl, gfp);
1329 if (err < 0)
1330 ddp_release_gl(gl, cdev->pdev);
1331
1332 return err;
1333 }
1334
1335 static void ddp_destroy(struct kref *kref)
1336 {
1337 struct cxgbi_ddp_info *ddp = container_of(kref,
1338 struct cxgbi_ddp_info,
1339 refcnt);
1340 struct cxgbi_device *cdev = ddp->cdev;
1341 int i = 0;
1342
1343 pr_info("kref 0, destroy ddp 0x%p, cdev 0x%p.\n", ddp, cdev);
1344
1345 while (i < ddp->nppods) {
1346 struct cxgbi_gather_list *gl = ddp->gl_map[i];
1347
1348 if (gl) {
1349 int npods = (gl->nelem + PPOD_PAGES_MAX - 1)
1350 >> PPOD_PAGES_SHIFT;
1351 pr_info("cdev 0x%p, ddp %d + %d.\n", cdev, i, npods);
1352 kfree(gl);
1353 if (cdev->csk_ddp_free_gl_skb)
1354 cdev->csk_ddp_free_gl_skb(ddp, i, npods);
1355 i += npods;
1356 } else
1357 i++;
1358 }
1359 cxgbi_free_big_mem(ddp);
1360 }
1361
1362 int cxgbi_ddp_cleanup(struct cxgbi_device *cdev)
1363 {
1364 struct cxgbi_ddp_info *ddp = cdev->ddp;
1365
1366 log_debug(1 << CXGBI_DBG_DDP,
1367 "cdev 0x%p, release ddp 0x%p.\n", cdev, ddp);
1368 cdev->ddp = NULL;
1369 if (ddp)
1370 return kref_put(&ddp->refcnt, ddp_destroy);
1371 return 0;
1372 }
1373 EXPORT_SYMBOL_GPL(cxgbi_ddp_cleanup);
1374
1375 int cxgbi_ddp_init(struct cxgbi_device *cdev,
1376 unsigned int llimit, unsigned int ulimit,
1377 unsigned int max_txsz, unsigned int max_rxsz)
1378 {
1379 struct cxgbi_ddp_info *ddp;
1380 unsigned int ppmax, bits;
1381
1382 ppmax = (ulimit - llimit + 1) >> PPOD_SIZE_SHIFT;
1383 bits = __ilog2_u32(ppmax) + 1;
1384 if (bits > PPOD_IDX_MAX_SIZE)
1385 bits = PPOD_IDX_MAX_SIZE;
1386 ppmax = (1 << (bits - 1)) - 1;
1387
1388 ddp = cxgbi_alloc_big_mem(sizeof(struct cxgbi_ddp_info) +
1389 ppmax * (sizeof(struct cxgbi_gather_list *) +
1390 sizeof(struct sk_buff *)),
1391 GFP_KERNEL);
1392 if (!ddp) {
1393 pr_warn("cdev 0x%p, ddp ppmax %u OOM.\n", cdev, ppmax);
1394 return -ENOMEM;
1395 }
1396 ddp->gl_map = (struct cxgbi_gather_list **)(ddp + 1);
1397 ddp->gl_skb = (struct sk_buff **)(((char *)ddp->gl_map) +
1398 ppmax * sizeof(struct cxgbi_gather_list *));
1399 cdev->ddp = ddp;
1400
1401 spin_lock_init(&ddp->map_lock);
1402 kref_init(&ddp->refcnt);
1403
1404 ddp->cdev = cdev;
1405 ddp->pdev = cdev->pdev;
1406 ddp->llimit = llimit;
1407 ddp->ulimit = ulimit;
1408 ddp->max_txsz = min_t(unsigned int, max_txsz, ULP2_MAX_PKT_SIZE);
1409 ddp->max_rxsz = min_t(unsigned int, max_rxsz, ULP2_MAX_PKT_SIZE);
1410 ddp->nppods = ppmax;
1411 ddp->idx_last = ppmax;
1412 ddp->idx_bits = bits;
1413 ddp->idx_mask = (1 << bits) - 1;
1414 ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1;
1415
1416 cdev->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
1417 cdev->tag_format.rsvd_bits = ddp->idx_bits;
1418 cdev->tag_format.rsvd_shift = PPOD_IDX_SHIFT;
1419 cdev->tag_format.rsvd_mask = (1 << cdev->tag_format.rsvd_bits) - 1;
1420
1421 pr_info("%s tag format, sw %u, rsvd %u,%u, mask 0x%x.\n",
1422 cdev->ports[0]->name, cdev->tag_format.sw_bits,
1423 cdev->tag_format.rsvd_bits, cdev->tag_format.rsvd_shift,
1424 cdev->tag_format.rsvd_mask);
1425
1426 cdev->tx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1427 ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
1428 cdev->rx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1429 ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);
1430
1431 log_debug(1 << CXGBI_DBG_DDP,
1432 "%s max payload size: %u/%u, %u/%u.\n",
1433 cdev->ports[0]->name, cdev->tx_max_size, ddp->max_txsz,
1434 cdev->rx_max_size, ddp->max_rxsz);
1435 return 0;
1436 }
1437 EXPORT_SYMBOL_GPL(cxgbi_ddp_init);
1438
1439 /*
1440 * APIs interacting with open-iscsi libraries
1441 */
1442
1443 static unsigned char padding[4];
1444
1445 static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1446 {
1447 struct scsi_cmnd *sc = task->sc;
1448 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1449 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1450 struct cxgbi_hba *chba = cconn->chba;
1451 struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1452 u32 tag = ntohl((__force u32)hdr_itt);
1453
1454 log_debug(1 << CXGBI_DBG_DDP,
1455 "cdev 0x%p, release tag 0x%x.\n", chba->cdev, tag);
1456 if (sc &&
1457 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
1458 cxgbi_is_ddp_tag(tformat, tag))
1459 ddp_tag_release(chba, tag);
1460 }
1461
1462 static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1463 {
1464 struct scsi_cmnd *sc = task->sc;
1465 struct iscsi_conn *conn = task->conn;
1466 struct iscsi_session *sess = conn->session;
1467 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1468 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1469 struct cxgbi_hba *chba = cconn->chba;
1470 struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1471 u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
1472 u32 tag = 0;
1473 int err = -EINVAL;
1474
1475 if (sc &&
1476 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)) {
1477 err = cxgbi_ddp_reserve(cconn->cep->csk, &tag, sw_tag,
1478 scsi_in(sc)->length,
1479 scsi_in(sc)->table.sgl,
1480 scsi_in(sc)->table.nents,
1481 GFP_ATOMIC);
1482 if (err < 0)
1483 log_debug(1 << CXGBI_DBG_DDP,
1484 "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1485 cconn->cep->csk, task, scsi_in(sc)->length,
1486 scsi_in(sc)->table.nents);
1487 }
1488
1489 if (err < 0)
1490 tag = cxgbi_set_non_ddp_tag(tformat, sw_tag);
1491 /* the itt need to sent in big-endian order */
1492 *hdr_itt = (__force itt_t)htonl(tag);
1493
1494 log_debug(1 << CXGBI_DBG_DDP,
1495 "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1496 chba->cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1497 return 0;
1498 }
1499
1500 void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1501 {
1502 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1503 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1504 struct cxgbi_device *cdev = cconn->chba->cdev;
1505 u32 tag = ntohl((__force u32) itt);
1506 u32 sw_bits;
1507
1508 sw_bits = cxgbi_tag_nonrsvd_bits(&cdev->tag_format, tag);
1509 if (idx)
1510 *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
1511 if (age)
1512 *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
1513
1514 log_debug(1 << CXGBI_DBG_DDP,
1515 "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1516 cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1517 age ? *age : 0xFF);
1518 }
1519 EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1520
1521 void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1522 {
1523 struct iscsi_conn *conn = csk->user_data;
1524
1525 if (conn) {
1526 log_debug(1 << CXGBI_DBG_SOCK,
1527 "csk 0x%p, cid %d.\n", csk, conn->id);
1528 iscsi_conn_queue_work(conn);
1529 }
1530 }
1531 EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1532
1533 /*
1534 * pdu receive, interact with libiscsi_tcp
1535 */
1536 static inline int read_pdu_skb(struct iscsi_conn *conn,
1537 struct sk_buff *skb,
1538 unsigned int offset,
1539 int offloaded)
1540 {
1541 int status = 0;
1542 int bytes_read;
1543
1544 bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1545 switch (status) {
1546 case ISCSI_TCP_CONN_ERR:
1547 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1548 skb, offset, offloaded);
1549 return -EIO;
1550 case ISCSI_TCP_SUSPENDED:
1551 log_debug(1 << CXGBI_DBG_PDU_RX,
1552 "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1553 skb, offset, offloaded, bytes_read);
1554 /* no transfer - just have caller flush queue */
1555 return bytes_read;
1556 case ISCSI_TCP_SKB_DONE:
1557 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1558 skb, offset, offloaded);
1559 /*
1560 * pdus should always fit in the skb and we should get
1561 * segment done notifcation.
1562 */
1563 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1564 return -EFAULT;
1565 case ISCSI_TCP_SEGMENT_DONE:
1566 log_debug(1 << CXGBI_DBG_PDU_RX,
1567 "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1568 skb, offset, offloaded, bytes_read);
1569 return bytes_read;
1570 default:
1571 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1572 skb, offset, offloaded, status);
1573 return -EINVAL;
1574 }
1575 }
1576
1577 static int skb_read_pdu_bhs(struct iscsi_conn *conn, struct sk_buff *skb)
1578 {
1579 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1580
1581 log_debug(1 << CXGBI_DBG_PDU_RX,
1582 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1583 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1584
1585 if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1586 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1587 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1588 return -EIO;
1589 }
1590
1591 if (conn->hdrdgst_en &&
1592 cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1593 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1594 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1595 return -EIO;
1596 }
1597
1598 return read_pdu_skb(conn, skb, 0, 0);
1599 }
1600
1601 static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1602 struct sk_buff *skb, unsigned int offset)
1603 {
1604 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1605 bool offloaded = 0;
1606 int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1607
1608 log_debug(1 << CXGBI_DBG_PDU_RX,
1609 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1610 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1611
1612 if (conn->datadgst_en &&
1613 cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1614 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1615 conn, lskb, cxgbi_skcb_flags(lskb));
1616 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1617 return -EIO;
1618 }
1619
1620 if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1621 return 0;
1622
1623 /* coalesced, add header digest length */
1624 if (lskb == skb && conn->hdrdgst_en)
1625 offset += ISCSI_DIGEST_SIZE;
1626
1627 if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1628 offloaded = 1;
1629
1630 if (opcode == ISCSI_OP_SCSI_DATA_IN)
1631 log_debug(1 << CXGBI_DBG_PDU_RX,
1632 "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1633 skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1634 tcp_conn->in.datalen, offloaded ? "is" : "not");
1635
1636 return read_pdu_skb(conn, skb, offset, offloaded);
1637 }
1638
1639 static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1640 {
1641 struct cxgbi_device *cdev = csk->cdev;
1642 int must_send;
1643 u32 credits;
1644
1645 log_debug(1 << CXGBI_DBG_PDU_RX,
1646 "csk 0x%p,%u,0x%lu,%u, seq %u, wup %u, thre %u, %u.\n",
1647 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1648 csk->rcv_wup, cdev->rx_credit_thres,
1649 cdev->rcv_win);
1650
1651 if (csk->state != CTP_ESTABLISHED)
1652 return;
1653
1654 credits = csk->copied_seq - csk->rcv_wup;
1655 if (unlikely(!credits))
1656 return;
1657 if (unlikely(cdev->rx_credit_thres == 0))
1658 return;
1659
1660 must_send = credits + 16384 >= cdev->rcv_win;
1661 if (must_send || credits >= cdev->rx_credit_thres)
1662 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1663 }
1664
1665 void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1666 {
1667 struct cxgbi_device *cdev = csk->cdev;
1668 struct iscsi_conn *conn = csk->user_data;
1669 struct sk_buff *skb;
1670 unsigned int read = 0;
1671 int err = 0;
1672
1673 log_debug(1 << CXGBI_DBG_PDU_RX,
1674 "csk 0x%p, conn 0x%p.\n", csk, conn);
1675
1676 if (unlikely(!conn || conn->suspend_rx)) {
1677 log_debug(1 << CXGBI_DBG_PDU_RX,
1678 "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1679 csk, conn, conn ? conn->id : 0xFF,
1680 conn ? conn->suspend_rx : 0xFF);
1681 return;
1682 }
1683
1684 while (!err) {
1685 skb = skb_peek(&csk->receive_queue);
1686 if (!skb ||
1687 !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1688 if (skb)
1689 log_debug(1 << CXGBI_DBG_PDU_RX,
1690 "skb 0x%p, NOT ready 0x%lx.\n",
1691 skb, cxgbi_skcb_flags(skb));
1692 break;
1693 }
1694 __skb_unlink(skb, &csk->receive_queue);
1695
1696 read += cxgbi_skcb_rx_pdulen(skb);
1697 log_debug(1 << CXGBI_DBG_PDU_RX,
1698 "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1699 csk, skb, skb->len, cxgbi_skcb_flags(skb),
1700 cxgbi_skcb_rx_pdulen(skb));
1701
1702 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1703 err = skb_read_pdu_bhs(conn, skb);
1704 if (err < 0) {
1705 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1706 "f 0x%lx, plen %u.\n",
1707 csk, skb, skb->len,
1708 cxgbi_skcb_flags(skb),
1709 cxgbi_skcb_rx_pdulen(skb));
1710 goto skb_done;
1711 }
1712 err = skb_read_pdu_data(conn, skb, skb,
1713 err + cdev->skb_rx_extra);
1714 if (err < 0)
1715 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1716 "f 0x%lx, plen %u.\n",
1717 csk, skb, skb->len,
1718 cxgbi_skcb_flags(skb),
1719 cxgbi_skcb_rx_pdulen(skb));
1720 } else {
1721 err = skb_read_pdu_bhs(conn, skb);
1722 if (err < 0) {
1723 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1724 "f 0x%lx, plen %u.\n",
1725 csk, skb, skb->len,
1726 cxgbi_skcb_flags(skb),
1727 cxgbi_skcb_rx_pdulen(skb));
1728 goto skb_done;
1729 }
1730
1731 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1732 struct sk_buff *dskb;
1733
1734 dskb = skb_peek(&csk->receive_queue);
1735 if (!dskb) {
1736 pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1737 " plen %u, NO data.\n",
1738 csk, skb, skb->len,
1739 cxgbi_skcb_flags(skb),
1740 cxgbi_skcb_rx_pdulen(skb));
1741 err = -EIO;
1742 goto skb_done;
1743 }
1744 __skb_unlink(dskb, &csk->receive_queue);
1745
1746 err = skb_read_pdu_data(conn, skb, dskb, 0);
1747 if (err < 0)
1748 pr_err("data, csk 0x%p, skb 0x%p,%u, "
1749 "f 0x%lx, plen %u, dskb 0x%p,"
1750 "%u.\n",
1751 csk, skb, skb->len,
1752 cxgbi_skcb_flags(skb),
1753 cxgbi_skcb_rx_pdulen(skb),
1754 dskb, dskb->len);
1755 __kfree_skb(dskb);
1756 } else
1757 err = skb_read_pdu_data(conn, skb, skb, 0);
1758 }
1759 skb_done:
1760 __kfree_skb(skb);
1761
1762 if (err < 0)
1763 break;
1764 }
1765
1766 log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
1767 if (read) {
1768 csk->copied_seq += read;
1769 csk_return_rx_credits(csk, read);
1770 conn->rxdata_octets += read;
1771 }
1772
1773 if (err < 0) {
1774 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
1775 csk, conn, err, read);
1776 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1777 }
1778 }
1779 EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
1780
1781 static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
1782 unsigned int offset, unsigned int *off,
1783 struct scatterlist **sgp)
1784 {
1785 int i;
1786 struct scatterlist *sg;
1787
1788 for_each_sg(sgl, sg, sgcnt, i) {
1789 if (offset < sg->length) {
1790 *off = offset;
1791 *sgp = sg;
1792 return 0;
1793 }
1794 offset -= sg->length;
1795 }
1796 return -EFAULT;
1797 }
1798
1799 static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
1800 unsigned int dlen, skb_frag_t *frags,
1801 int frag_max)
1802 {
1803 unsigned int datalen = dlen;
1804 unsigned int sglen = sg->length - sgoffset;
1805 struct page *page = sg_page(sg);
1806 int i;
1807
1808 i = 0;
1809 do {
1810 unsigned int copy;
1811
1812 if (!sglen) {
1813 sg = sg_next(sg);
1814 if (!sg) {
1815 pr_warn("sg %d NULL, len %u/%u.\n",
1816 i, datalen, dlen);
1817 return -EINVAL;
1818 }
1819 sgoffset = 0;
1820 sglen = sg->length;
1821 page = sg_page(sg);
1822
1823 }
1824 copy = min(datalen, sglen);
1825 if (i && page == frags[i - 1].page &&
1826 sgoffset + sg->offset ==
1827 frags[i - 1].page_offset + frags[i - 1].size) {
1828 frags[i - 1].size += copy;
1829 } else {
1830 if (i >= frag_max) {
1831 pr_warn("too many pages %u, dlen %u.\n",
1832 frag_max, dlen);
1833 return -EINVAL;
1834 }
1835
1836 frags[i].page = page;
1837 frags[i].page_offset = sg->offset + sgoffset;
1838 frags[i].size = copy;
1839 i++;
1840 }
1841 datalen -= copy;
1842 sgoffset += copy;
1843 sglen -= copy;
1844 } while (datalen);
1845
1846 return i;
1847 }
1848
1849 int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
1850 {
1851 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1852 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1853 struct cxgbi_device *cdev = cconn->chba->cdev;
1854 struct iscsi_conn *conn = task->conn;
1855 struct iscsi_tcp_task *tcp_task = task->dd_data;
1856 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1857 struct scsi_cmnd *sc = task->sc;
1858 int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
1859
1860 tcp_task->dd_data = tdata;
1861 task->hdr = NULL;
1862
1863 if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
1864 (opcode == ISCSI_OP_SCSI_DATA_OUT ||
1865 (opcode == ISCSI_OP_SCSI_CMD &&
1866 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
1867 /* data could goes into skb head */
1868 headroom += min_t(unsigned int,
1869 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
1870 conn->max_xmit_dlength);
1871
1872 tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
1873 if (!tdata->skb) {
1874 pr_warn("alloc skb %u+%u, opcode 0x%x failed.\n",
1875 cdev->skb_tx_rsvd, headroom, opcode);
1876 return -ENOMEM;
1877 }
1878
1879 skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
1880 task->hdr = (struct iscsi_hdr *)tdata->skb->data;
1881 task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
1882
1883 /* data_out uses scsi_cmd's itt */
1884 if (opcode != ISCSI_OP_SCSI_DATA_OUT)
1885 task_reserve_itt(task, &task->hdr->itt);
1886
1887 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1888 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
1889 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
1890 conn->max_xmit_dlength, ntohl(task->hdr->itt));
1891
1892 return 0;
1893 }
1894 EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
1895
1896 static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
1897 {
1898 u8 submode = 0;
1899
1900 if (hcrc)
1901 submode |= 1;
1902 if (dcrc)
1903 submode |= 2;
1904 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
1905 }
1906
1907 int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
1908 unsigned int count)
1909 {
1910 struct iscsi_conn *conn = task->conn;
1911 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1912 struct sk_buff *skb = tdata->skb;
1913 unsigned int datalen = count;
1914 int i, padlen = iscsi_padding(count);
1915 struct page *pg;
1916
1917 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1918 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
1919 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
1920 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
1921
1922 skb_put(skb, task->hdr_len);
1923 tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
1924 if (!count)
1925 return 0;
1926
1927 if (task->sc) {
1928 struct scsi_data_buffer *sdb = scsi_out(task->sc);
1929 struct scatterlist *sg = NULL;
1930 int err;
1931
1932 tdata->offset = offset;
1933 tdata->count = count;
1934 err = sgl_seek_offset(
1935 sdb->table.sgl, sdb->table.nents,
1936 tdata->offset, &tdata->sgoffset, &sg);
1937 if (err < 0) {
1938 pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
1939 sdb->table.nents, tdata->offset, sdb->length);
1940 return err;
1941 }
1942 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
1943 tdata->frags, MAX_PDU_FRAGS);
1944 if (err < 0) {
1945 pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
1946 sdb->table.nents, tdata->offset, tdata->count);
1947 return err;
1948 }
1949 tdata->nr_frags = err;
1950
1951 if (tdata->nr_frags > MAX_SKB_FRAGS ||
1952 (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
1953 char *dst = skb->data + task->hdr_len;
1954 skb_frag_t *frag = tdata->frags;
1955
1956 /* data fits in the skb's headroom */
1957 for (i = 0; i < tdata->nr_frags; i++, frag++) {
1958 char *src = kmap_atomic(frag->page,
1959 KM_SOFTIRQ0);
1960
1961 memcpy(dst, src+frag->page_offset, frag->size);
1962 dst += frag->size;
1963 kunmap_atomic(src, KM_SOFTIRQ0);
1964 }
1965 if (padlen) {
1966 memset(dst, 0, padlen);
1967 padlen = 0;
1968 }
1969 skb_put(skb, count + padlen);
1970 } else {
1971 /* data fit into frag_list */
1972 for (i = 0; i < tdata->nr_frags; i++)
1973 get_page(tdata->frags[i].page);
1974
1975 memcpy(skb_shinfo(skb)->frags, tdata->frags,
1976 sizeof(skb_frag_t) * tdata->nr_frags);
1977 skb_shinfo(skb)->nr_frags = tdata->nr_frags;
1978 skb->len += count;
1979 skb->data_len += count;
1980 skb->truesize += count;
1981 }
1982
1983 } else {
1984 pg = virt_to_page(task->data);
1985
1986 get_page(pg);
1987 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
1988 count);
1989 skb->len += count;
1990 skb->data_len += count;
1991 skb->truesize += count;
1992 }
1993
1994 if (padlen) {
1995 i = skb_shinfo(skb)->nr_frags;
1996 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
1997 virt_to_page(padding), offset_in_page(padding),
1998 padlen);
1999
2000 skb->data_len += padlen;
2001 skb->truesize += padlen;
2002 skb->len += padlen;
2003 }
2004
2005 return 0;
2006 }
2007 EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
2008
2009 int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2010 {
2011 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2012 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2013 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2014 struct sk_buff *skb = tdata->skb;
2015 unsigned int datalen;
2016 int err;
2017
2018 if (!skb) {
2019 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2020 "task 0x%p, skb NULL.\n", task);
2021 return 0;
2022 }
2023
2024 datalen = skb->data_len;
2025 tdata->skb = NULL;
2026 err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2027 if (err > 0) {
2028 int pdulen = err;
2029
2030 log_debug(1 << CXGBI_DBG_PDU_TX,
2031 "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2032 task, task->sc, skb, skb->len, skb->data_len, err);
2033
2034 if (task->conn->hdrdgst_en)
2035 pdulen += ISCSI_DIGEST_SIZE;
2036
2037 if (datalen && task->conn->datadgst_en)
2038 pdulen += ISCSI_DIGEST_SIZE;
2039
2040 task->conn->txdata_octets += pdulen;
2041 return 0;
2042 }
2043
2044 if (err == -EAGAIN || err == -ENOBUFS) {
2045 log_debug(1 << CXGBI_DBG_PDU_TX,
2046 "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2047 task, skb, skb->len, skb->data_len, err);
2048 /* reset skb to send when we are called again */
2049 tdata->skb = skb;
2050 return err;
2051 }
2052
2053 kfree_skb(skb);
2054 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2055 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2056 task->itt, skb, skb->len, skb->data_len, err);
2057 iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2058 iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2059 return err;
2060 }
2061 EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2062
2063 void cxgbi_cleanup_task(struct iscsi_task *task)
2064 {
2065 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2066
2067 log_debug(1 << CXGBI_DBG_ISCSI,
2068 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2069 task, tdata->skb, task->hdr_itt);
2070
2071 /* never reached the xmit task callout */
2072 if (tdata->skb)
2073 __kfree_skb(tdata->skb);
2074 memset(tdata, 0, sizeof(*tdata));
2075
2076 task_release_itt(task, task->hdr_itt);
2077 iscsi_tcp_cleanup_task(task);
2078 }
2079 EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2080
2081 void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2082 struct iscsi_stats *stats)
2083 {
2084 struct iscsi_conn *conn = cls_conn->dd_data;
2085
2086 stats->txdata_octets = conn->txdata_octets;
2087 stats->rxdata_octets = conn->rxdata_octets;
2088 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2089 stats->dataout_pdus = conn->dataout_pdus_cnt;
2090 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2091 stats->datain_pdus = conn->datain_pdus_cnt;
2092 stats->r2t_pdus = conn->r2t_pdus_cnt;
2093 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2094 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2095 stats->digest_err = 0;
2096 stats->timeout_err = 0;
2097 stats->custom_length = 1;
2098 strcpy(stats->custom[0].desc, "eh_abort_cnt");
2099 stats->custom[0].value = conn->eh_abort_cnt;
2100 }
2101 EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2102
2103 static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2104 {
2105 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2106 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2107 struct cxgbi_device *cdev = cconn->chba->cdev;
2108 unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2109 unsigned int max_def = 512 * MAX_SKB_FRAGS;
2110 unsigned int max = max(max_def, headroom);
2111
2112 max = min(cconn->chba->cdev->tx_max_size, max);
2113 if (conn->max_xmit_dlength)
2114 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2115 else
2116 conn->max_xmit_dlength = max;
2117 cxgbi_align_pdu_size(conn->max_xmit_dlength);
2118
2119 return 0;
2120 }
2121
2122 static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2123 {
2124 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2125 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2126 unsigned int max = cconn->chba->cdev->rx_max_size;
2127
2128 cxgbi_align_pdu_size(max);
2129
2130 if (conn->max_recv_dlength) {
2131 if (conn->max_recv_dlength > max) {
2132 pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2133 conn->max_recv_dlength, max);
2134 return -EINVAL;
2135 }
2136 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2137 cxgbi_align_pdu_size(conn->max_recv_dlength);
2138 } else
2139 conn->max_recv_dlength = max;
2140
2141 return 0;
2142 }
2143
2144 int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2145 enum iscsi_param param, char *buf, int buflen)
2146 {
2147 struct iscsi_conn *conn = cls_conn->dd_data;
2148 struct iscsi_session *session = conn->session;
2149 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2150 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2151 struct cxgbi_sock *csk = cconn->cep->csk;
2152 int value, err = 0;
2153
2154 log_debug(1 << CXGBI_DBG_ISCSI,
2155 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2156 cls_conn, param, buflen, buf);
2157
2158 switch (param) {
2159 case ISCSI_PARAM_HDRDGST_EN:
2160 err = iscsi_set_param(cls_conn, param, buf, buflen);
2161 if (!err && conn->hdrdgst_en)
2162 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2163 conn->hdrdgst_en,
2164 conn->datadgst_en, 0);
2165 break;
2166 case ISCSI_PARAM_DATADGST_EN:
2167 err = iscsi_set_param(cls_conn, param, buf, buflen);
2168 if (!err && conn->datadgst_en)
2169 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2170 conn->hdrdgst_en,
2171 conn->datadgst_en, 0);
2172 break;
2173 case ISCSI_PARAM_MAX_R2T:
2174 sscanf(buf, "%d", &value);
2175 if (value <= 0 || !is_power_of_2(value))
2176 return -EINVAL;
2177 if (session->max_r2t == value)
2178 break;
2179 iscsi_tcp_r2tpool_free(session);
2180 err = iscsi_set_param(cls_conn, param, buf, buflen);
2181 if (!err && iscsi_tcp_r2tpool_alloc(session))
2182 return -ENOMEM;
2183 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2184 err = iscsi_set_param(cls_conn, param, buf, buflen);
2185 if (!err)
2186 err = cxgbi_conn_max_recv_dlength(conn);
2187 break;
2188 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2189 err = iscsi_set_param(cls_conn, param, buf, buflen);
2190 if (!err)
2191 err = cxgbi_conn_max_xmit_dlength(conn);
2192 break;
2193 default:
2194 return iscsi_set_param(cls_conn, param, buf, buflen);
2195 }
2196 return err;
2197 }
2198 EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2199
2200 int cxgbi_get_conn_param(struct iscsi_cls_conn *cls_conn,
2201 enum iscsi_param param, char *buf)
2202 {
2203 struct iscsi_conn *iconn = cls_conn->dd_data;
2204 int len;
2205
2206 log_debug(1 << CXGBI_DBG_ISCSI,
2207 "cls_conn 0x%p, param %d.\n", cls_conn, param);
2208
2209 switch (param) {
2210 case ISCSI_PARAM_CONN_PORT:
2211 spin_lock_bh(&iconn->session->lock);
2212 len = sprintf(buf, "%hu\n", iconn->portal_port);
2213 spin_unlock_bh(&iconn->session->lock);
2214 break;
2215 case ISCSI_PARAM_CONN_ADDRESS:
2216 spin_lock_bh(&iconn->session->lock);
2217 len = sprintf(buf, "%s\n", iconn->portal_address);
2218 spin_unlock_bh(&iconn->session->lock);
2219 break;
2220 default:
2221 return iscsi_conn_get_param(cls_conn, param, buf);
2222 }
2223 return len;
2224 }
2225 EXPORT_SYMBOL_GPL(cxgbi_get_conn_param);
2226
2227 struct iscsi_cls_conn *
2228 cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2229 {
2230 struct iscsi_cls_conn *cls_conn;
2231 struct iscsi_conn *conn;
2232 struct iscsi_tcp_conn *tcp_conn;
2233 struct cxgbi_conn *cconn;
2234
2235 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2236 if (!cls_conn)
2237 return NULL;
2238
2239 conn = cls_conn->dd_data;
2240 tcp_conn = conn->dd_data;
2241 cconn = tcp_conn->dd_data;
2242 cconn->iconn = conn;
2243
2244 log_debug(1 << CXGBI_DBG_ISCSI,
2245 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2246 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2247
2248 return cls_conn;
2249 }
2250 EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2251
2252 int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2253 struct iscsi_cls_conn *cls_conn,
2254 u64 transport_eph, int is_leading)
2255 {
2256 struct iscsi_conn *conn = cls_conn->dd_data;
2257 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2258 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2259 struct iscsi_endpoint *ep;
2260 struct cxgbi_endpoint *cep;
2261 struct cxgbi_sock *csk;
2262 int err;
2263
2264 ep = iscsi_lookup_endpoint(transport_eph);
2265 if (!ep)
2266 return -EINVAL;
2267
2268 /* setup ddp pagesize */
2269 cep = ep->dd_data;
2270 csk = cep->csk;
2271 err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid, page_idx, 0);
2272 if (err < 0)
2273 return err;
2274
2275 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2276 if (err)
2277 return -EINVAL;
2278
2279 /* calculate the tag idx bits needed for this conn based on cmds_max */
2280 cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2281
2282 write_lock_bh(&csk->callback_lock);
2283 csk->user_data = conn;
2284 cconn->chba = cep->chba;
2285 cconn->cep = cep;
2286 cep->cconn = cconn;
2287 write_unlock_bh(&csk->callback_lock);
2288
2289 cxgbi_conn_max_xmit_dlength(conn);
2290 cxgbi_conn_max_recv_dlength(conn);
2291
2292 spin_lock_bh(&conn->session->lock);
2293 sprintf(conn->portal_address, "%pI4", &csk->daddr.sin_addr.s_addr);
2294 conn->portal_port = ntohs(csk->daddr.sin_port);
2295 spin_unlock_bh(&conn->session->lock);
2296
2297 log_debug(1 << CXGBI_DBG_ISCSI,
2298 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2299 cls_session, cls_conn, ep, cconn, csk);
2300 /* init recv engine */
2301 iscsi_tcp_hdr_recv_prep(tcp_conn);
2302
2303 return 0;
2304 }
2305 EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2306
2307 struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2308 u16 cmds_max, u16 qdepth,
2309 u32 initial_cmdsn)
2310 {
2311 struct cxgbi_endpoint *cep;
2312 struct cxgbi_hba *chba;
2313 struct Scsi_Host *shost;
2314 struct iscsi_cls_session *cls_session;
2315 struct iscsi_session *session;
2316
2317 if (!ep) {
2318 pr_err("missing endpoint.\n");
2319 return NULL;
2320 }
2321
2322 cep = ep->dd_data;
2323 chba = cep->chba;
2324 shost = chba->shost;
2325
2326 BUG_ON(chba != iscsi_host_priv(shost));
2327
2328 cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2329 cmds_max, 0,
2330 sizeof(struct iscsi_tcp_task) +
2331 sizeof(struct cxgbi_task_data),
2332 initial_cmdsn, ISCSI_MAX_TARGET);
2333 if (!cls_session)
2334 return NULL;
2335
2336 session = cls_session->dd_data;
2337 if (iscsi_tcp_r2tpool_alloc(session))
2338 goto remove_session;
2339
2340 log_debug(1 << CXGBI_DBG_ISCSI,
2341 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2342 return cls_session;
2343
2344 remove_session:
2345 iscsi_session_teardown(cls_session);
2346 return NULL;
2347 }
2348 EXPORT_SYMBOL_GPL(cxgbi_create_session);
2349
2350 void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2351 {
2352 log_debug(1 << CXGBI_DBG_ISCSI,
2353 "cls sess 0x%p.\n", cls_session);
2354
2355 iscsi_tcp_r2tpool_free(cls_session->dd_data);
2356 iscsi_session_teardown(cls_session);
2357 }
2358 EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2359
2360 int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2361 char *buf, int buflen)
2362 {
2363 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2364
2365 if (!chba->ndev) {
2366 shost_printk(KERN_ERR, shost, "Could not get host param. "
2367 "netdev for host not set.\n");
2368 return -ENODEV;
2369 }
2370
2371 log_debug(1 << CXGBI_DBG_ISCSI,
2372 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2373 shost, chba, chba->ndev->name, param, buflen, buf);
2374
2375 switch (param) {
2376 case ISCSI_HOST_PARAM_IPADDRESS:
2377 {
2378 __be32 addr = in_aton(buf);
2379 log_debug(1 << CXGBI_DBG_ISCSI,
2380 "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2381 cxgbi_set_iscsi_ipv4(chba, addr);
2382 return 0;
2383 }
2384 case ISCSI_HOST_PARAM_HWADDRESS:
2385 case ISCSI_HOST_PARAM_NETDEV_NAME:
2386 return 0;
2387 default:
2388 return iscsi_host_set_param(shost, param, buf, buflen);
2389 }
2390 }
2391 EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2392
2393 int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2394 char *buf)
2395 {
2396 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2397 int len = 0;
2398
2399 if (!chba->ndev) {
2400 shost_printk(KERN_ERR, shost, "Could not get host param. "
2401 "netdev for host not set.\n");
2402 return -ENODEV;
2403 }
2404
2405 log_debug(1 << CXGBI_DBG_ISCSI,
2406 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2407 shost, chba, chba->ndev->name, param);
2408
2409 switch (param) {
2410 case ISCSI_HOST_PARAM_HWADDRESS:
2411 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2412 break;
2413 case ISCSI_HOST_PARAM_NETDEV_NAME:
2414 len = sprintf(buf, "%s\n", chba->ndev->name);
2415 break;
2416 case ISCSI_HOST_PARAM_IPADDRESS:
2417 {
2418 __be32 addr;
2419
2420 addr = cxgbi_get_iscsi_ipv4(chba);
2421 len = sprintf(buf, "%pI4", &addr);
2422 log_debug(1 << CXGBI_DBG_ISCSI,
2423 "hba %s, ipv4 %pI4.\n", chba->ndev->name, &addr);
2424 break;
2425 }
2426 default:
2427 return iscsi_host_get_param(shost, param, buf);
2428 }
2429
2430 return len;
2431 }
2432 EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2433
2434 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2435 struct sockaddr *dst_addr,
2436 int non_blocking)
2437 {
2438 struct iscsi_endpoint *ep;
2439 struct cxgbi_endpoint *cep;
2440 struct cxgbi_hba *hba = NULL;
2441 struct cxgbi_sock *csk;
2442 int err = -EINVAL;
2443
2444 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2445 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2446 shost, non_blocking, dst_addr);
2447
2448 if (shost) {
2449 hba = iscsi_host_priv(shost);
2450 if (!hba) {
2451 pr_info("shost 0x%p, priv NULL.\n", shost);
2452 goto err_out;
2453 }
2454 }
2455
2456 csk = cxgbi_check_route(dst_addr);
2457 if (IS_ERR(csk))
2458 return (struct iscsi_endpoint *)csk;
2459 cxgbi_sock_get(csk);
2460
2461 if (!hba)
2462 hba = csk->cdev->hbas[csk->port_id];
2463 else if (hba != csk->cdev->hbas[csk->port_id]) {
2464 pr_info("Could not connect through requested host %u"
2465 "hba 0x%p != 0x%p (%u).\n",
2466 shost->host_no, hba,
2467 csk->cdev->hbas[csk->port_id], csk->port_id);
2468 err = -ENOSPC;
2469 goto release_conn;
2470 }
2471
2472 err = sock_get_port(csk);
2473 if (err)
2474 goto release_conn;
2475
2476 cxgbi_sock_set_state(csk, CTP_CONNECTING);
2477 err = csk->cdev->csk_init_act_open(csk);
2478 if (err)
2479 goto release_conn;
2480
2481 if (cxgbi_sock_is_closing(csk)) {
2482 err = -ENOSPC;
2483 pr_info("csk 0x%p is closing.\n", csk);
2484 goto release_conn;
2485 }
2486
2487 ep = iscsi_create_endpoint(sizeof(*cep));
2488 if (!ep) {
2489 err = -ENOMEM;
2490 pr_info("iscsi alloc ep, OOM.\n");
2491 goto release_conn;
2492 }
2493
2494 cep = ep->dd_data;
2495 cep->csk = csk;
2496 cep->chba = hba;
2497
2498 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2499 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2500 ep, cep, csk, hba, hba->ndev->name);
2501 return ep;
2502
2503 release_conn:
2504 cxgbi_sock_put(csk);
2505 cxgbi_sock_closed(csk);
2506 err_out:
2507 return ERR_PTR(err);
2508 }
2509 EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2510
2511 int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2512 {
2513 struct cxgbi_endpoint *cep = ep->dd_data;
2514 struct cxgbi_sock *csk = cep->csk;
2515
2516 if (!cxgbi_sock_is_established(csk))
2517 return 0;
2518 return 1;
2519 }
2520 EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2521
2522 void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2523 {
2524 struct cxgbi_endpoint *cep = ep->dd_data;
2525 struct cxgbi_conn *cconn = cep->cconn;
2526 struct cxgbi_sock *csk = cep->csk;
2527
2528 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2529 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2530 ep, cep, cconn, csk, csk->state, csk->flags);
2531
2532 if (cconn && cconn->iconn) {
2533 iscsi_suspend_tx(cconn->iconn);
2534 write_lock_bh(&csk->callback_lock);
2535 cep->csk->user_data = NULL;
2536 cconn->cep = NULL;
2537 write_unlock_bh(&csk->callback_lock);
2538 }
2539 iscsi_destroy_endpoint(ep);
2540
2541 if (likely(csk->state >= CTP_ESTABLISHED))
2542 need_active_close(csk);
2543 else
2544 cxgbi_sock_closed(csk);
2545
2546 cxgbi_sock_put(csk);
2547 }
2548 EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2549
2550 int cxgbi_iscsi_init(struct iscsi_transport *itp,
2551 struct scsi_transport_template **stt)
2552 {
2553 *stt = iscsi_register_transport(itp);
2554 if (*stt == NULL) {
2555 pr_err("unable to register %s transport 0x%p.\n",
2556 itp->name, itp);
2557 return -ENODEV;
2558 }
2559 log_debug(1 << CXGBI_DBG_ISCSI,
2560 "%s, registered iscsi transport 0x%p.\n",
2561 itp->name, stt);
2562 return 0;
2563 }
2564 EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2565
2566 void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2567 struct scsi_transport_template **stt)
2568 {
2569 if (*stt) {
2570 log_debug(1 << CXGBI_DBG_ISCSI,
2571 "de-register transport 0x%p, %s, stt 0x%p.\n",
2572 itp, itp->name, *stt);
2573 *stt = NULL;
2574 iscsi_unregister_transport(itp);
2575 }
2576 }
2577 EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2578
2579 static int __init libcxgbi_init_module(void)
2580 {
2581 sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
2582 sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
2583
2584 pr_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
2585 ISCSI_ITT_MASK, sw_tag_idx_bits,
2586 ISCSI_AGE_MASK, sw_tag_age_bits);
2587
2588 ddp_setup_host_page_size();
2589 return 0;
2590 }
2591
2592 static void __exit libcxgbi_exit_module(void)
2593 {
2594 cxgbi_device_unregister_all(0xFF);
2595 return;
2596 }
2597
2598 module_init(libcxgbi_init_module);
2599 module_exit(libcxgbi_exit_module);
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