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nilfs2: unbreak compat ioctl
[zen-stable.git] / drivers / scsi / cxgbi / libcxgbi.c
blobc10f74a566f2d58741e0c2012b15017e8ce07a5f
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 <linux/module.h>
29 #include <net/tcp.h>
30
31 static unsigned int dbg_level;
32
33 #include "libcxgbi.h"
34
35 #define DRV_MODULE_NAME "libcxgbi"
36 #define DRV_MODULE_DESC "Chelsio iSCSI driver library"
37 #define DRV_MODULE_VERSION "0.9.0"
38 #define DRV_MODULE_RELDATE "Jun. 2010"
39
40 MODULE_AUTHOR("Chelsio Communications, Inc.");
41 MODULE_DESCRIPTION(DRV_MODULE_DESC);
42 MODULE_VERSION(DRV_MODULE_VERSION);
43 MODULE_LICENSE("GPL");
44
45 module_param(dbg_level, uint, 0644);
46 MODULE_PARM_DESC(dbg_level, "libiscsi debug level (default=0)");
47
48
49 /*
50 * cxgbi device management
51 * maintains a list of the cxgbi devices
52 */
53 static LIST_HEAD(cdev_list);
54 static DEFINE_MUTEX(cdev_mutex);
55
56 int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
57 unsigned int max_conn)
58 {
59 struct cxgbi_ports_map *pmap = &cdev->pmap;
60
61 pmap->port_csk = cxgbi_alloc_big_mem(max_conn *
62 sizeof(struct cxgbi_sock *),
63 GFP_KERNEL);
64 if (!pmap->port_csk) {
65 pr_warn("cdev 0x%p, portmap OOM %u.\n", cdev, max_conn);
66 return -ENOMEM;
67 }
68
69 pmap->max_connect = max_conn;
70 pmap->sport_base = base;
71 spin_lock_init(&pmap->lock);
72 return 0;
73 }
74 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_create);
75
76 void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev)
77 {
78 struct cxgbi_ports_map *pmap = &cdev->pmap;
79 struct cxgbi_sock *csk;
80 int i;
81
82 for (i = 0; i < pmap->max_connect; i++) {
83 if (pmap->port_csk[i]) {
84 csk = pmap->port_csk[i];
85 pmap->port_csk[i] = NULL;
86 log_debug(1 << CXGBI_DBG_SOCK,
87 "csk 0x%p, cdev 0x%p, offload down.\n",
88 csk, cdev);
89 spin_lock_bh(&csk->lock);
90 cxgbi_sock_set_flag(csk, CTPF_OFFLOAD_DOWN);
91 cxgbi_sock_closed(csk);
92 spin_unlock_bh(&csk->lock);
93 cxgbi_sock_put(csk);
94 }
95 }
96 }
97 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_cleanup);
98
99 static inline void cxgbi_device_destroy(struct cxgbi_device *cdev)
100 {
101 log_debug(1 << CXGBI_DBG_DEV,
102 "cdev 0x%p, p# %u.\n", cdev, cdev->nports);
103 cxgbi_hbas_remove(cdev);
104 cxgbi_device_portmap_cleanup(cdev);
105 if (cdev->dev_ddp_cleanup)
106 cdev->dev_ddp_cleanup(cdev);
107 else
108 cxgbi_ddp_cleanup(cdev);
109 if (cdev->ddp)
110 cxgbi_ddp_cleanup(cdev);
111 if (cdev->pmap.max_connect)
112 cxgbi_free_big_mem(cdev->pmap.port_csk);
113 kfree(cdev);
114 }
115
116 struct cxgbi_device *cxgbi_device_register(unsigned int extra,
117 unsigned int nports)
118 {
119 struct cxgbi_device *cdev;
120
121 cdev = kzalloc(sizeof(*cdev) + extra + nports *
122 (sizeof(struct cxgbi_hba *) +
123 sizeof(struct net_device *)),
124 GFP_KERNEL);
125 if (!cdev) {
126 pr_warn("nport %d, OOM.\n", nports);
127 return NULL;
128 }
129 cdev->ports = (struct net_device **)(cdev + 1);
130 cdev->hbas = (struct cxgbi_hba **)(((char*)cdev->ports) + nports *
131 sizeof(struct net_device *));
132 if (extra)
133 cdev->dd_data = ((char *)cdev->hbas) +
134 nports * sizeof(struct cxgbi_hba *);
135 spin_lock_init(&cdev->pmap.lock);
136
137 mutex_lock(&cdev_mutex);
138 list_add_tail(&cdev->list_head, &cdev_list);
139 mutex_unlock(&cdev_mutex);
140
141 log_debug(1 << CXGBI_DBG_DEV,
142 "cdev 0x%p, p# %u.\n", cdev, nports);
143 return cdev;
144 }
145 EXPORT_SYMBOL_GPL(cxgbi_device_register);
146
147 void cxgbi_device_unregister(struct cxgbi_device *cdev)
148 {
149 log_debug(1 << CXGBI_DBG_DEV,
150 "cdev 0x%p, p# %u,%s.\n",
151 cdev, cdev->nports, cdev->nports ? cdev->ports[0]->name : "");
152 mutex_lock(&cdev_mutex);
153 list_del(&cdev->list_head);
154 mutex_unlock(&cdev_mutex);
155 cxgbi_device_destroy(cdev);
156 }
157 EXPORT_SYMBOL_GPL(cxgbi_device_unregister);
158
159 void cxgbi_device_unregister_all(unsigned int flag)
160 {
161 struct cxgbi_device *cdev, *tmp;
162
163 mutex_lock(&cdev_mutex);
164 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
165 if ((cdev->flags & flag) == flag) {
166 log_debug(1 << CXGBI_DBG_DEV,
167 "cdev 0x%p, p# %u,%s.\n",
168 cdev, cdev->nports, cdev->nports ?
169 cdev->ports[0]->name : "");
170 list_del(&cdev->list_head);
171 cxgbi_device_destroy(cdev);
172 }
173 }
174 mutex_unlock(&cdev_mutex);
175 }
176 EXPORT_SYMBOL_GPL(cxgbi_device_unregister_all);
177
178 struct cxgbi_device *cxgbi_device_find_by_lldev(void *lldev)
179 {
180 struct cxgbi_device *cdev, *tmp;
181
182 mutex_lock(&cdev_mutex);
183 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
184 if (cdev->lldev == lldev) {
185 mutex_unlock(&cdev_mutex);
186 return cdev;
187 }
188 }
189 mutex_unlock(&cdev_mutex);
190 log_debug(1 << CXGBI_DBG_DEV,
191 "lldev 0x%p, NO match found.\n", lldev);
192 return NULL;
193 }
194 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev);
195
196 static struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev,
197 int *port)
198 {
199 struct net_device *vdev = NULL;
200 struct cxgbi_device *cdev, *tmp;
201 int i;
202
203 if (ndev->priv_flags & IFF_802_1Q_VLAN) {
204 vdev = ndev;
205 ndev = vlan_dev_real_dev(ndev);
206 log_debug(1 << CXGBI_DBG_DEV,
207 "vlan dev %s -> %s.\n", vdev->name, ndev->name);
208 }
209
210 mutex_lock(&cdev_mutex);
211 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
212 for (i = 0; i < cdev->nports; i++) {
213 if (ndev == cdev->ports[i]) {
214 cdev->hbas[i]->vdev = vdev;
215 mutex_unlock(&cdev_mutex);
216 if (port)
217 *port = i;
218 return cdev;
219 }
220 }
221 }
222 mutex_unlock(&cdev_mutex);
223 log_debug(1 << CXGBI_DBG_DEV,
224 "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
225 return NULL;
226 }
227
228 void cxgbi_hbas_remove(struct cxgbi_device *cdev)
229 {
230 int i;
231 struct cxgbi_hba *chba;
232
233 log_debug(1 << CXGBI_DBG_DEV,
234 "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
235
236 for (i = 0; i < cdev->nports; i++) {
237 chba = cdev->hbas[i];
238 if (chba) {
239 cdev->hbas[i] = NULL;
240 iscsi_host_remove(chba->shost);
241 pci_dev_put(cdev->pdev);
242 iscsi_host_free(chba->shost);
243 }
244 }
245 }
246 EXPORT_SYMBOL_GPL(cxgbi_hbas_remove);
247
248 int cxgbi_hbas_add(struct cxgbi_device *cdev, unsigned int max_lun,
249 unsigned int max_id, struct scsi_host_template *sht,
250 struct scsi_transport_template *stt)
251 {
252 struct cxgbi_hba *chba;
253 struct Scsi_Host *shost;
254 int i, err;
255
256 log_debug(1 << CXGBI_DBG_DEV, "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
257
258 for (i = 0; i < cdev->nports; i++) {
259 shost = iscsi_host_alloc(sht, sizeof(*chba), 1);
260 if (!shost) {
261 pr_info("0x%p, p%d, %s, host alloc failed.\n",
262 cdev, i, cdev->ports[i]->name);
263 err = -ENOMEM;
264 goto err_out;
265 }
266
267 shost->transportt = stt;
268 shost->max_lun = max_lun;
269 shost->max_id = max_id;
270 shost->max_channel = 0;
271 shost->max_cmd_len = 16;
272
273 chba = iscsi_host_priv(shost);
274 chba->cdev = cdev;
275 chba->ndev = cdev->ports[i];
276 chba->shost = shost;
277
278 log_debug(1 << CXGBI_DBG_DEV,
279 "cdev 0x%p, p#%d %s: chba 0x%p.\n",
280 cdev, i, cdev->ports[i]->name, chba);
281
282 pci_dev_get(cdev->pdev);
283 err = iscsi_host_add(shost, &cdev->pdev->dev);
284 if (err) {
285 pr_info("cdev 0x%p, p#%d %s, host add failed.\n",
286 cdev, i, cdev->ports[i]->name);
287 pci_dev_put(cdev->pdev);
288 scsi_host_put(shost);
289 goto err_out;
290 }
291
292 cdev->hbas[i] = chba;
293 }
294
295 return 0;
296
297 err_out:
298 cxgbi_hbas_remove(cdev);
299 return err;
300 }
301 EXPORT_SYMBOL_GPL(cxgbi_hbas_add);
302
303 /*
304 * iSCSI offload
305 *
306 * - source port management
307 * To find a free source port in the port allocation map we use a very simple
308 * rotor scheme to look for the next free port.
309 *
310 * If a source port has been specified make sure that it doesn't collide with
311 * our normal source port allocation map. If it's outside the range of our
312 * allocation/deallocation scheme just let them use it.
313 *
314 * If the source port is outside our allocation range, the caller is
315 * responsible for keeping track of their port usage.
316 */
317 static int sock_get_port(struct cxgbi_sock *csk)
318 {
319 struct cxgbi_device *cdev = csk->cdev;
320 struct cxgbi_ports_map *pmap = &cdev->pmap;
321 unsigned int start;
322 int idx;
323
324 if (!pmap->max_connect) {
325 pr_err("cdev 0x%p, p#%u %s, NO port map.\n",
326 cdev, csk->port_id, cdev->ports[csk->port_id]->name);
327 return -EADDRNOTAVAIL;
328 }
329
330 if (csk->saddr.sin_port) {
331 pr_err("source port NON-ZERO %u.\n",
332 ntohs(csk->saddr.sin_port));
333 return -EADDRINUSE;
334 }
335
336 spin_lock_bh(&pmap->lock);
337 if (pmap->used >= pmap->max_connect) {
338 spin_unlock_bh(&pmap->lock);
339 pr_info("cdev 0x%p, p#%u %s, ALL ports used.\n",
340 cdev, csk->port_id, cdev->ports[csk->port_id]->name);
341 return -EADDRNOTAVAIL;
342 }
343
344 start = idx = pmap->next;
345 do {
346 if (++idx >= pmap->max_connect)
347 idx = 0;
348 if (!pmap->port_csk[idx]) {
349 pmap->used++;
350 csk->saddr.sin_port =
351 htons(pmap->sport_base + idx);
352 pmap->next = idx;
353 pmap->port_csk[idx] = csk;
354 spin_unlock_bh(&pmap->lock);
355 cxgbi_sock_get(csk);
356 log_debug(1 << CXGBI_DBG_SOCK,
357 "cdev 0x%p, p#%u %s, p %u, %u.\n",
358 cdev, csk->port_id,
359 cdev->ports[csk->port_id]->name,
360 pmap->sport_base + idx, pmap->next);
361 return 0;
362 }
363 } while (idx != start);
364 spin_unlock_bh(&pmap->lock);
365
366 /* should not happen */
367 pr_warn("cdev 0x%p, p#%u %s, next %u?\n",
368 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
369 pmap->next);
370 return -EADDRNOTAVAIL;
371 }
372
373 static void sock_put_port(struct cxgbi_sock *csk)
374 {
375 struct cxgbi_device *cdev = csk->cdev;
376 struct cxgbi_ports_map *pmap = &cdev->pmap;
377
378 if (csk->saddr.sin_port) {
379 int idx = ntohs(csk->saddr.sin_port) - pmap->sport_base;
380
381 csk->saddr.sin_port = 0;
382 if (idx < 0 || idx >= pmap->max_connect) {
383 pr_err("cdev 0x%p, p#%u %s, port %u OOR.\n",
384 cdev, csk->port_id,
385 cdev->ports[csk->port_id]->name,
386 ntohs(csk->saddr.sin_port));
387 return;
388 }
389
390 spin_lock_bh(&pmap->lock);
391 pmap->port_csk[idx] = NULL;
392 pmap->used--;
393 spin_unlock_bh(&pmap->lock);
394
395 log_debug(1 << CXGBI_DBG_SOCK,
396 "cdev 0x%p, p#%u %s, release %u.\n",
397 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
398 pmap->sport_base + idx);
399
400 cxgbi_sock_put(csk);
401 }
402 }
403
404 /*
405 * iscsi tcp connection
406 */
407 void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *csk)
408 {
409 if (csk->cpl_close) {
410 kfree_skb(csk->cpl_close);
411 csk->cpl_close = NULL;
412 }
413 if (csk->cpl_abort_req) {
414 kfree_skb(csk->cpl_abort_req);
415 csk->cpl_abort_req = NULL;
416 }
417 if (csk->cpl_abort_rpl) {
418 kfree_skb(csk->cpl_abort_rpl);
419 csk->cpl_abort_rpl = NULL;
420 }
421 }
422 EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs);
423
424 static struct cxgbi_sock *cxgbi_sock_create(struct cxgbi_device *cdev)
425 {
426 struct cxgbi_sock *csk = kzalloc(sizeof(*csk), GFP_NOIO);
427
428 if (!csk) {
429 pr_info("alloc csk %zu failed.\n", sizeof(*csk));
430 return NULL;
431 }
432
433 if (cdev->csk_alloc_cpls(csk) < 0) {
434 pr_info("csk 0x%p, alloc cpls failed.\n", csk);
435 kfree(csk);
436 return NULL;
437 }
438
439 spin_lock_init(&csk->lock);
440 kref_init(&csk->refcnt);
441 skb_queue_head_init(&csk->receive_queue);
442 skb_queue_head_init(&csk->write_queue);
443 setup_timer(&csk->retry_timer, NULL, (unsigned long)csk);
444 rwlock_init(&csk->callback_lock);
445 csk->cdev = cdev;
446 csk->flags = 0;
447 cxgbi_sock_set_state(csk, CTP_CLOSED);
448
449 log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk);
450
451 return csk;
452 }
453
454 static struct rtable *find_route_ipv4(struct flowi4 *fl4,
455 __be32 saddr, __be32 daddr,
456 __be16 sport, __be16 dport, u8 tos)
457 {
458 struct rtable *rt;
459
460 rt = ip_route_output_ports(&init_net, fl4, NULL, daddr, saddr,
461 dport, sport, IPPROTO_TCP, tos, 0);
462 if (IS_ERR(rt))
463 return NULL;
464
465 return rt;
466 }
467
468 static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr)
469 {
470 struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
471 struct dst_entry *dst;
472 struct net_device *ndev;
473 struct cxgbi_device *cdev;
474 struct rtable *rt = NULL;
475 struct flowi4 fl4;
476 struct cxgbi_sock *csk = NULL;
477 unsigned int mtu = 0;
478 int port = 0xFFFF;
479 int err = 0;
480
481 if (daddr->sin_family != AF_INET) {
482 pr_info("address family 0x%x NOT supported.\n",
483 daddr->sin_family);
484 err = -EAFNOSUPPORT;
485 goto err_out;
486 }
487
488 rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0, daddr->sin_port, 0);
489 if (!rt) {
490 pr_info("no route to ipv4 0x%x, port %u.\n",
491 daddr->sin_addr.s_addr, daddr->sin_port);
492 err = -ENETUNREACH;
493 goto err_out;
494 }
495 dst = &rt->dst;
496 ndev = dst_get_neighbour(dst)->dev;
497
498 if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
499 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
500 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
501 ndev->name);
502 err = -ENETUNREACH;
503 goto rel_rt;
504 }
505
506 if (ndev->flags & IFF_LOOPBACK) {
507 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
508 mtu = ndev->mtu;
509 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
510 dst_get_neighbour(dst)->dev->name, ndev->name, mtu);
511 }
512
513 cdev = cxgbi_device_find_by_netdev(ndev, &port);
514 if (!cdev) {
515 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
516 &daddr->sin_addr.s_addr, ndev->name);
517 err = -ENETUNREACH;
518 goto rel_rt;
519 }
520 log_debug(1 << CXGBI_DBG_SOCK,
521 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
522 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
523 port, ndev->name, cdev);
524
525 csk = cxgbi_sock_create(cdev);
526 if (!csk) {
527 err = -ENOMEM;
528 goto rel_rt;
529 }
530 csk->cdev = cdev;
531 csk->port_id = port;
532 csk->mtu = mtu;
533 csk->dst = dst;
534 csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
535 csk->daddr.sin_port = daddr->sin_port;
536 csk->daddr.sin_family = daddr->sin_family;
537 csk->saddr.sin_addr.s_addr = fl4.saddr;
538
539 return csk;
540
541 rel_rt:
542 ip_rt_put(rt);
543 if (csk)
544 cxgbi_sock_closed(csk);
545 err_out:
546 return ERR_PTR(err);
547 }
548
549 void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
550 unsigned int opt)
551 {
552 csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
553 dst_confirm(csk->dst);
554 smp_mb();
555 cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
556 }
557 EXPORT_SYMBOL_GPL(cxgbi_sock_established);
558
559 static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
560 {
561 log_debug(1 << CXGBI_DBG_SOCK,
562 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
563 csk, csk->state, csk->flags, csk->user_data);
564
565 if (csk->state != CTP_ESTABLISHED) {
566 read_lock_bh(&csk->callback_lock);
567 if (csk->user_data)
568 iscsi_conn_failure(csk->user_data,
569 ISCSI_ERR_CONN_FAILED);
570 read_unlock_bh(&csk->callback_lock);
571 }
572 }
573
574 void cxgbi_sock_closed(struct cxgbi_sock *csk)
575 {
576 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
577 csk, (csk)->state, (csk)->flags, (csk)->tid);
578 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
579 if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
580 return;
581 if (csk->saddr.sin_port)
582 sock_put_port(csk);
583 if (csk->dst)
584 dst_release(csk->dst);
585 csk->cdev->csk_release_offload_resources(csk);
586 cxgbi_sock_set_state(csk, CTP_CLOSED);
587 cxgbi_inform_iscsi_conn_closing(csk);
588 cxgbi_sock_put(csk);
589 }
590 EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
591
592 static void need_active_close(struct cxgbi_sock *csk)
593 {
594 int data_lost;
595 int close_req = 0;
596
597 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
598 csk, (csk)->state, (csk)->flags, (csk)->tid);
599 spin_lock_bh(&csk->lock);
600 dst_confirm(csk->dst);
601 data_lost = skb_queue_len(&csk->receive_queue);
602 __skb_queue_purge(&csk->receive_queue);
603
604 if (csk->state == CTP_ACTIVE_OPEN)
605 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
606 else if (csk->state == CTP_ESTABLISHED) {
607 close_req = 1;
608 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
609 } else if (csk->state == CTP_PASSIVE_CLOSE) {
610 close_req = 1;
611 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
612 }
613
614 if (close_req) {
615 if (data_lost)
616 csk->cdev->csk_send_abort_req(csk);
617 else
618 csk->cdev->csk_send_close_req(csk);
619 }
620
621 spin_unlock_bh(&csk->lock);
622 }
623
624 void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
625 {
626 pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
627 csk, csk->state, csk->flags,
628 &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
629 &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
630 errno);
631
632 cxgbi_sock_set_state(csk, CTP_CONNECTING);
633 csk->err = errno;
634 cxgbi_sock_closed(csk);
635 }
636 EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
637
638 void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
639 {
640 struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
641
642 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
643 csk, (csk)->state, (csk)->flags, (csk)->tid);
644 cxgbi_sock_get(csk);
645 spin_lock_bh(&csk->lock);
646 if (csk->state == CTP_ACTIVE_OPEN)
647 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
648 spin_unlock_bh(&csk->lock);
649 cxgbi_sock_put(csk);
650 __kfree_skb(skb);
651 }
652 EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
653
654 void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
655 {
656 cxgbi_sock_get(csk);
657 spin_lock_bh(&csk->lock);
658 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
659 if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_RCVD))
660 cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
661 else {
662 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_RCVD);
663 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
664 if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
665 pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
666 csk, csk->state, csk->flags, csk->tid);
667 cxgbi_sock_closed(csk);
668 }
669 }
670 spin_unlock_bh(&csk->lock);
671 cxgbi_sock_put(csk);
672 }
673 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
674
675 void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
676 {
677 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
678 csk, (csk)->state, (csk)->flags, (csk)->tid);
679 cxgbi_sock_get(csk);
680 spin_lock_bh(&csk->lock);
681
682 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
683 goto done;
684
685 switch (csk->state) {
686 case CTP_ESTABLISHED:
687 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
688 break;
689 case CTP_ACTIVE_CLOSE:
690 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
691 break;
692 case CTP_CLOSE_WAIT_1:
693 cxgbi_sock_closed(csk);
694 break;
695 case CTP_ABORTING:
696 break;
697 default:
698 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
699 csk, csk->state, csk->flags, csk->tid);
700 }
701 cxgbi_inform_iscsi_conn_closing(csk);
702 done:
703 spin_unlock_bh(&csk->lock);
704 cxgbi_sock_put(csk);
705 }
706 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
707
708 void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
709 {
710 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
711 csk, (csk)->state, (csk)->flags, (csk)->tid);
712 cxgbi_sock_get(csk);
713 spin_lock_bh(&csk->lock);
714
715 csk->snd_una = snd_nxt - 1;
716 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
717 goto done;
718
719 switch (csk->state) {
720 case CTP_ACTIVE_CLOSE:
721 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
722 break;
723 case CTP_CLOSE_WAIT_1:
724 case CTP_CLOSE_WAIT_2:
725 cxgbi_sock_closed(csk);
726 break;
727 case CTP_ABORTING:
728 break;
729 default:
730 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
731 csk, csk->state, csk->flags, csk->tid);
732 }
733 done:
734 spin_unlock_bh(&csk->lock);
735 cxgbi_sock_put(csk);
736 }
737 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
738
739 void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
740 unsigned int snd_una, int seq_chk)
741 {
742 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
743 "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
744 csk, csk->state, csk->flags, csk->tid, credits,
745 csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
746
747 spin_lock_bh(&csk->lock);
748
749 csk->wr_cred += credits;
750 if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
751 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
752
753 while (credits) {
754 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
755
756 if (unlikely(!p)) {
757 pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
758 csk, csk->state, csk->flags, csk->tid, credits,
759 csk->wr_cred, csk->wr_una_cred);
760 break;
761 }
762
763 if (unlikely(credits < p->csum)) {
764 pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
765 csk, csk->state, csk->flags, csk->tid,
766 credits, csk->wr_cred, csk->wr_una_cred,
767 p->csum);
768 p->csum -= credits;
769 break;
770 } else {
771 cxgbi_sock_dequeue_wr(csk);
772 credits -= p->csum;
773 kfree_skb(p);
774 }
775 }
776
777 cxgbi_sock_check_wr_invariants(csk);
778
779 if (seq_chk) {
780 if (unlikely(before(snd_una, csk->snd_una))) {
781 pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
782 csk, csk->state, csk->flags, csk->tid, snd_una,
783 csk->snd_una);
784 goto done;
785 }
786
787 if (csk->snd_una != snd_una) {
788 csk->snd_una = snd_una;
789 dst_confirm(csk->dst);
790 }
791 }
792
793 if (skb_queue_len(&csk->write_queue)) {
794 if (csk->cdev->csk_push_tx_frames(csk, 0))
795 cxgbi_conn_tx_open(csk);
796 } else
797 cxgbi_conn_tx_open(csk);
798 done:
799 spin_unlock_bh(&csk->lock);
800 }
801 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
802
803 static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
804 unsigned short mtu)
805 {
806 int i = 0;
807
808 while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
809 ++i;
810
811 return i;
812 }
813
814 unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
815 {
816 unsigned int idx;
817 struct dst_entry *dst = csk->dst;
818
819 csk->advmss = dst_metric_advmss(dst);
820
821 if (csk->advmss > pmtu - 40)
822 csk->advmss = pmtu - 40;
823 if (csk->advmss < csk->cdev->mtus[0] - 40)
824 csk->advmss = csk->cdev->mtus[0] - 40;
825 idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
826
827 return idx;
828 }
829 EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
830
831 void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
832 {
833 cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
834 __skb_queue_tail(&csk->write_queue, skb);
835 }
836 EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
837
838 void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
839 {
840 struct sk_buff *skb;
841
842 while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
843 kfree_skb(skb);
844 }
845 EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
846
847 void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
848 {
849 int pending = cxgbi_sock_count_pending_wrs(csk);
850
851 if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
852 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
853 csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
854 }
855 EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
856
857 static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
858 {
859 struct cxgbi_device *cdev = csk->cdev;
860 struct sk_buff *next;
861 int err, copied = 0;
862
863 spin_lock_bh(&csk->lock);
864
865 if (csk->state != CTP_ESTABLISHED) {
866 log_debug(1 << CXGBI_DBG_PDU_TX,
867 "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
868 csk, csk->state, csk->flags, csk->tid);
869 err = -EAGAIN;
870 goto out_err;
871 }
872
873 if (csk->err) {
874 log_debug(1 << CXGBI_DBG_PDU_TX,
875 "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
876 csk, csk->state, csk->flags, csk->tid, csk->err);
877 err = -EPIPE;
878 goto out_err;
879 }
880
881 if (csk->write_seq - csk->snd_una >= cdev->snd_win) {
882 log_debug(1 << CXGBI_DBG_PDU_TX,
883 "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
884 csk, csk->state, csk->flags, csk->tid, csk->write_seq,
885 csk->snd_una, cdev->snd_win);
886 err = -ENOBUFS;
887 goto out_err;
888 }
889
890 while (skb) {
891 int frags = skb_shinfo(skb)->nr_frags +
892 (skb->len != skb->data_len);
893
894 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
895 pr_err("csk 0x%p, skb head %u < %u.\n",
896 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
897 err = -EINVAL;
898 goto out_err;
899 }
900
901 if (frags >= SKB_WR_LIST_SIZE) {
902 pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
903 csk, skb_shinfo(skb)->nr_frags, skb->len,
904 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
905 err = -EINVAL;
906 goto out_err;
907 }
908
909 next = skb->next;
910 skb->next = NULL;
911 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
912 cxgbi_sock_skb_entail(csk, skb);
913 copied += skb->len;
914 csk->write_seq += skb->len +
915 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
916 skb = next;
917 }
918 done:
919 if (likely(skb_queue_len(&csk->write_queue)))
920 cdev->csk_push_tx_frames(csk, 1);
921 spin_unlock_bh(&csk->lock);
922 return copied;
923
924 out_err:
925 if (copied == 0 && err == -EPIPE)
926 copied = csk->err ? csk->err : -EPIPE;
927 else
928 copied = err;
929 goto done;
930 }
931
932 /*
933 * Direct Data Placement -
934 * Directly place the iSCSI Data-In or Data-Out PDU's payload into pre-posted
935 * final destination host-memory buffers based on the Initiator Task Tag (ITT)
936 * in Data-In or Target Task Tag (TTT) in Data-Out PDUs.
937 * The host memory address is programmed into h/w in the format of pagepod
938 * entries.
939 * The location of the pagepod entry is encoded into ddp tag which is used as
940 * the base for ITT/TTT.
941 */
942
943 static unsigned char ddp_page_order[DDP_PGIDX_MAX] = {0, 1, 2, 4};
944 static unsigned char ddp_page_shift[DDP_PGIDX_MAX] = {12, 13, 14, 16};
945 static unsigned char page_idx = DDP_PGIDX_MAX;
946
947 static unsigned char sw_tag_idx_bits;
948 static unsigned char sw_tag_age_bits;
949
950 /*
951 * Direct-Data Placement page size adjustment
952 */
953 static int ddp_adjust_page_table(void)
954 {
955 int i;
956 unsigned int base_order, order;
957
958 if (PAGE_SIZE < (1UL << ddp_page_shift[0])) {
959 pr_info("PAGE_SIZE 0x%lx too small, min 0x%lx\n",
960 PAGE_SIZE, 1UL << ddp_page_shift[0]);
961 return -EINVAL;
962 }
963
964 base_order = get_order(1UL << ddp_page_shift[0]);
965 order = get_order(1UL << PAGE_SHIFT);
966
967 for (i = 0; i < DDP_PGIDX_MAX; i++) {
968 /* first is the kernel page size, then just doubling */
969 ddp_page_order[i] = order - base_order + i;
970 ddp_page_shift[i] = PAGE_SHIFT + i;
971 }
972 return 0;
973 }
974
975 static int ddp_find_page_index(unsigned long pgsz)
976 {
977 int i;
978
979 for (i = 0; i < DDP_PGIDX_MAX; i++) {
980 if (pgsz == (1UL << ddp_page_shift[i]))
981 return i;
982 }
983 pr_info("ddp page size %lu not supported.\n", pgsz);
984 return DDP_PGIDX_MAX;
985 }
986
987 static void ddp_setup_host_page_size(void)
988 {
989 if (page_idx == DDP_PGIDX_MAX) {
990 page_idx = ddp_find_page_index(PAGE_SIZE);
991
992 if (page_idx == DDP_PGIDX_MAX) {
993 pr_info("system PAGE %lu, update hw.\n", PAGE_SIZE);
994 if (ddp_adjust_page_table() < 0) {
995 pr_info("PAGE %lu, disable ddp.\n", PAGE_SIZE);
996 return;
997 }
998 page_idx = ddp_find_page_index(PAGE_SIZE);
999 }
1000 pr_info("system PAGE %lu, ddp idx %u.\n", PAGE_SIZE, page_idx);
1001 }
1002 }
1003
1004 void cxgbi_ddp_page_size_factor(int *pgsz_factor)
1005 {
1006 int i;
1007
1008 for (i = 0; i < DDP_PGIDX_MAX; i++)
1009 pgsz_factor[i] = ddp_page_order[i];
1010 }
1011 EXPORT_SYMBOL_GPL(cxgbi_ddp_page_size_factor);
1012
1013 /*
1014 * DDP setup & teardown
1015 */
1016
1017 void cxgbi_ddp_ppod_set(struct cxgbi_pagepod *ppod,
1018 struct cxgbi_pagepod_hdr *hdr,
1019 struct cxgbi_gather_list *gl, unsigned int gidx)
1020 {
1021 int i;
1022
1023 memcpy(ppod, hdr, sizeof(*hdr));
1024 for (i = 0; i < (PPOD_PAGES_MAX + 1); i++, gidx++) {
1025 ppod->addr[i] = gidx < gl->nelem ?
1026 cpu_to_be64(gl->phys_addr[gidx]) : 0ULL;
1027 }
1028 }
1029 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_set);
1030
1031 void cxgbi_ddp_ppod_clear(struct cxgbi_pagepod *ppod)
1032 {
1033 memset(ppod, 0, sizeof(*ppod));
1034 }
1035 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_clear);
1036
1037 static inline int ddp_find_unused_entries(struct cxgbi_ddp_info *ddp,
1038 unsigned int start, unsigned int max,
1039 unsigned int count,
1040 struct cxgbi_gather_list *gl)
1041 {
1042 unsigned int i, j, k;
1043
1044 /* not enough entries */
1045 if ((max - start) < count) {
1046 log_debug(1 << CXGBI_DBG_DDP,
1047 "NOT enough entries %u+%u < %u.\n", start, count, max);
1048 return -EBUSY;
1049 }
1050
1051 max -= count;
1052 spin_lock(&ddp->map_lock);
1053 for (i = start; i < max;) {
1054 for (j = 0, k = i; j < count; j++, k++) {
1055 if (ddp->gl_map[k])
1056 break;
1057 }
1058 if (j == count) {
1059 for (j = 0, k = i; j < count; j++, k++)
1060 ddp->gl_map[k] = gl;
1061 spin_unlock(&ddp->map_lock);
1062 return i;
1063 }
1064 i += j + 1;
1065 }
1066 spin_unlock(&ddp->map_lock);
1067 log_debug(1 << CXGBI_DBG_DDP,
1068 "NO suitable entries %u available.\n", count);
1069 return -EBUSY;
1070 }
1071
1072 static inline void ddp_unmark_entries(struct cxgbi_ddp_info *ddp,
1073 int start, int count)
1074 {
1075 spin_lock(&ddp->map_lock);
1076 memset(&ddp->gl_map[start], 0,
1077 count * sizeof(struct cxgbi_gather_list *));
1078 spin_unlock(&ddp->map_lock);
1079 }
1080
1081 static inline void ddp_gl_unmap(struct pci_dev *pdev,
1082 struct cxgbi_gather_list *gl)
1083 {
1084 int i;
1085
1086 for (i = 0; i < gl->nelem; i++)
1087 dma_unmap_page(&pdev->dev, gl->phys_addr[i], PAGE_SIZE,
1088 PCI_DMA_FROMDEVICE);
1089 }
1090
1091 static inline int ddp_gl_map(struct pci_dev *pdev,
1092 struct cxgbi_gather_list *gl)
1093 {
1094 int i;
1095
1096 for (i = 0; i < gl->nelem; i++) {
1097 gl->phys_addr[i] = dma_map_page(&pdev->dev, gl->pages[i], 0,
1098 PAGE_SIZE,
1099 PCI_DMA_FROMDEVICE);
1100 if (unlikely(dma_mapping_error(&pdev->dev, gl->phys_addr[i]))) {
1101 log_debug(1 << CXGBI_DBG_DDP,
1102 "page %d 0x%p, 0x%p dma mapping err.\n",
1103 i, gl->pages[i], pdev);
1104 goto unmap;
1105 }
1106 }
1107 return i;
1108 unmap:
1109 if (i) {
1110 unsigned int nelem = gl->nelem;
1111
1112 gl->nelem = i;
1113 ddp_gl_unmap(pdev, gl);
1114 gl->nelem = nelem;
1115 }
1116 return -EINVAL;
1117 }
1118
1119 static void ddp_release_gl(struct cxgbi_gather_list *gl,
1120 struct pci_dev *pdev)
1121 {
1122 ddp_gl_unmap(pdev, gl);
1123 kfree(gl);
1124 }
1125
1126 static struct cxgbi_gather_list *ddp_make_gl(unsigned int xferlen,
1127 struct scatterlist *sgl,
1128 unsigned int sgcnt,
1129 struct pci_dev *pdev,
1130 gfp_t gfp)
1131 {
1132 struct cxgbi_gather_list *gl;
1133 struct scatterlist *sg = sgl;
1134 struct page *sgpage = sg_page(sg);
1135 unsigned int sglen = sg->length;
1136 unsigned int sgoffset = sg->offset;
1137 unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >>
1138 PAGE_SHIFT;
1139 int i = 1, j = 0;
1140
1141 if (xferlen < DDP_THRESHOLD) {
1142 log_debug(1 << CXGBI_DBG_DDP,
1143 "xfer %u < threshold %u, no ddp.\n",
1144 xferlen, DDP_THRESHOLD);
1145 return NULL;
1146 }
1147
1148 gl = kzalloc(sizeof(struct cxgbi_gather_list) +
1149 npages * (sizeof(dma_addr_t) +
1150 sizeof(struct page *)), gfp);
1151 if (!gl) {
1152 log_debug(1 << CXGBI_DBG_DDP,
1153 "xfer %u, %u pages, OOM.\n", xferlen, npages);
1154 return NULL;
1155 }
1156
1157 log_debug(1 << CXGBI_DBG_DDP,
1158 "xfer %u, sgl %u, gl max %u.\n", xferlen, sgcnt, npages);
1159
1160 gl->pages = (struct page **)&gl->phys_addr[npages];
1161 gl->nelem = npages;
1162 gl->length = xferlen;
1163 gl->offset = sgoffset;
1164 gl->pages[0] = sgpage;
1165
1166 for (i = 1, sg = sg_next(sgl), j = 0; i < sgcnt;
1167 i++, sg = sg_next(sg)) {
1168 struct page *page = sg_page(sg);
1169
1170 if (sgpage == page && sg->offset == sgoffset + sglen)
1171 sglen += sg->length;
1172 else {
1173 /* make sure the sgl is fit for ddp:
1174 * each has the same page size, and
1175 * all of the middle pages are used completely
1176 */
1177 if ((j && sgoffset) || ((i != sgcnt - 1) &&
1178 ((sglen + sgoffset) & ~PAGE_MASK))) {
1179 log_debug(1 << CXGBI_DBG_DDP,
1180 "page %d/%u, %u + %u.\n",
1181 i, sgcnt, sgoffset, sglen);
1182 goto error_out;
1183 }
1184
1185 j++;
1186 if (j == gl->nelem || sg->offset) {
1187 log_debug(1 << CXGBI_DBG_DDP,
1188 "page %d/%u, offset %u.\n",
1189 j, gl->nelem, sg->offset);
1190 goto error_out;
1191 }
1192 gl->pages[j] = page;
1193 sglen = sg->length;
1194 sgoffset = sg->offset;
1195 sgpage = page;
1196 }
1197 }
1198 gl->nelem = ++j;
1199
1200 if (ddp_gl_map(pdev, gl) < 0)
1201 goto error_out;
1202
1203 return gl;
1204
1205 error_out:
1206 kfree(gl);
1207 return NULL;
1208 }
1209
1210 static void ddp_tag_release(struct cxgbi_hba *chba, u32 tag)
1211 {
1212 struct cxgbi_device *cdev = chba->cdev;
1213 struct cxgbi_ddp_info *ddp = cdev->ddp;
1214 u32 idx;
1215
1216 idx = (tag >> PPOD_IDX_SHIFT) & ddp->idx_mask;
1217 if (idx < ddp->nppods) {
1218 struct cxgbi_gather_list *gl = ddp->gl_map[idx];
1219 unsigned int npods;
1220
1221 if (!gl || !gl->nelem) {
1222 pr_warn("tag 0x%x, idx %u, gl 0x%p, %u.\n",
1223 tag, idx, gl, gl ? gl->nelem : 0);
1224 return;
1225 }
1226 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1227 log_debug(1 << CXGBI_DBG_DDP,
1228 "tag 0x%x, release idx %u, npods %u.\n",
1229 tag, idx, npods);
1230 cdev->csk_ddp_clear(chba, tag, idx, npods);
1231 ddp_unmark_entries(ddp, idx, npods);
1232 ddp_release_gl(gl, ddp->pdev);
1233 } else
1234 pr_warn("tag 0x%x, idx %u > max %u.\n", tag, idx, ddp->nppods);
1235 }
1236
1237 static int ddp_tag_reserve(struct cxgbi_sock *csk, unsigned int tid,
1238 u32 sw_tag, u32 *tagp, struct cxgbi_gather_list *gl,
1239 gfp_t gfp)
1240 {
1241 struct cxgbi_device *cdev = csk->cdev;
1242 struct cxgbi_ddp_info *ddp = cdev->ddp;
1243 struct cxgbi_tag_format *tformat = &cdev->tag_format;
1244 struct cxgbi_pagepod_hdr hdr;
1245 unsigned int npods;
1246 int idx = -1;
1247 int err = -ENOMEM;
1248 u32 tag;
1249
1250 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1251 if (ddp->idx_last == ddp->nppods)
1252 idx = ddp_find_unused_entries(ddp, 0, ddp->nppods,
1253 npods, gl);
1254 else {
1255 idx = ddp_find_unused_entries(ddp, ddp->idx_last + 1,
1256 ddp->nppods, npods,
1257 gl);
1258 if (idx < 0 && ddp->idx_last >= npods) {
1259 idx = ddp_find_unused_entries(ddp, 0,
1260 min(ddp->idx_last + npods, ddp->nppods),
1261 npods, gl);
1262 }
1263 }
1264 if (idx < 0) {
1265 log_debug(1 << CXGBI_DBG_DDP,
1266 "xferlen %u, gl %u, npods %u NO DDP.\n",
1267 gl->length, gl->nelem, npods);
1268 return idx;
1269 }
1270
1271 tag = cxgbi_ddp_tag_base(tformat, sw_tag);
1272 tag |= idx << PPOD_IDX_SHIFT;
1273
1274 hdr.rsvd = 0;
1275 hdr.vld_tid = htonl(PPOD_VALID_FLAG | PPOD_TID(tid));
1276 hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask);
1277 hdr.max_offset = htonl(gl->length);
1278 hdr.page_offset = htonl(gl->offset);
1279
1280 err = cdev->csk_ddp_set(csk, &hdr, idx, npods, gl);
1281 if (err < 0)
1282 goto unmark_entries;
1283
1284 ddp->idx_last = idx;
1285 log_debug(1 << CXGBI_DBG_DDP,
1286 "xfer %u, gl %u,%u, tid 0x%x, tag 0x%x->0x%x(%u,%u).\n",
1287 gl->length, gl->nelem, gl->offset, tid, sw_tag, tag, idx,
1288 npods);
1289 *tagp = tag;
1290 return 0;
1291
1292 unmark_entries:
1293 ddp_unmark_entries(ddp, idx, npods);
1294 return err;
1295 }
1296
1297 int cxgbi_ddp_reserve(struct cxgbi_sock *csk, unsigned int *tagp,
1298 unsigned int sw_tag, unsigned int xferlen,
1299 struct scatterlist *sgl, unsigned int sgcnt, gfp_t gfp)
1300 {
1301 struct cxgbi_device *cdev = csk->cdev;
1302 struct cxgbi_tag_format *tformat = &cdev->tag_format;
1303 struct cxgbi_gather_list *gl;
1304 int err;
1305
1306 if (page_idx >= DDP_PGIDX_MAX || !cdev->ddp ||
1307 xferlen < DDP_THRESHOLD) {
1308 log_debug(1 << CXGBI_DBG_DDP,
1309 "pgidx %u, xfer %u, NO ddp.\n", page_idx, xferlen);
1310 return -EINVAL;
1311 }
1312
1313 if (!cxgbi_sw_tag_usable(tformat, sw_tag)) {
1314 log_debug(1 << CXGBI_DBG_DDP,
1315 "sw_tag 0x%x NOT usable.\n", sw_tag);
1316 return -EINVAL;
1317 }
1318
1319 gl = ddp_make_gl(xferlen, sgl, sgcnt, cdev->pdev, gfp);
1320 if (!gl)
1321 return -ENOMEM;
1322
1323 err = ddp_tag_reserve(csk, csk->tid, sw_tag, tagp, gl, gfp);
1324 if (err < 0)
1325 ddp_release_gl(gl, cdev->pdev);
1326
1327 return err;
1328 }
1329
1330 static void ddp_destroy(struct kref *kref)
1331 {
1332 struct cxgbi_ddp_info *ddp = container_of(kref,
1333 struct cxgbi_ddp_info,
1334 refcnt);
1335 struct cxgbi_device *cdev = ddp->cdev;
1336 int i = 0;
1337
1338 pr_info("kref 0, destroy ddp 0x%p, cdev 0x%p.\n", ddp, cdev);
1339
1340 while (i < ddp->nppods) {
1341 struct cxgbi_gather_list *gl = ddp->gl_map[i];
1342
1343 if (gl) {
1344 int npods = (gl->nelem + PPOD_PAGES_MAX - 1)
1345 >> PPOD_PAGES_SHIFT;
1346 pr_info("cdev 0x%p, ddp %d + %d.\n", cdev, i, npods);
1347 kfree(gl);
1348 i += npods;
1349 } else
1350 i++;
1351 }
1352 cxgbi_free_big_mem(ddp);
1353 }
1354
1355 int cxgbi_ddp_cleanup(struct cxgbi_device *cdev)
1356 {
1357 struct cxgbi_ddp_info *ddp = cdev->ddp;
1358
1359 log_debug(1 << CXGBI_DBG_DDP,
1360 "cdev 0x%p, release ddp 0x%p.\n", cdev, ddp);
1361 cdev->ddp = NULL;
1362 if (ddp)
1363 return kref_put(&ddp->refcnt, ddp_destroy);
1364 return 0;
1365 }
1366 EXPORT_SYMBOL_GPL(cxgbi_ddp_cleanup);
1367
1368 int cxgbi_ddp_init(struct cxgbi_device *cdev,
1369 unsigned int llimit, unsigned int ulimit,
1370 unsigned int max_txsz, unsigned int max_rxsz)
1371 {
1372 struct cxgbi_ddp_info *ddp;
1373 unsigned int ppmax, bits;
1374
1375 ppmax = (ulimit - llimit + 1) >> PPOD_SIZE_SHIFT;
1376 bits = __ilog2_u32(ppmax) + 1;
1377 if (bits > PPOD_IDX_MAX_SIZE)
1378 bits = PPOD_IDX_MAX_SIZE;
1379 ppmax = (1 << (bits - 1)) - 1;
1380
1381 ddp = cxgbi_alloc_big_mem(sizeof(struct cxgbi_ddp_info) +
1382 ppmax * (sizeof(struct cxgbi_gather_list *) +
1383 sizeof(struct sk_buff *)),
1384 GFP_KERNEL);
1385 if (!ddp) {
1386 pr_warn("cdev 0x%p, ddp ppmax %u OOM.\n", cdev, ppmax);
1387 return -ENOMEM;
1388 }
1389 ddp->gl_map = (struct cxgbi_gather_list **)(ddp + 1);
1390 cdev->ddp = ddp;
1391
1392 spin_lock_init(&ddp->map_lock);
1393 kref_init(&ddp->refcnt);
1394
1395 ddp->cdev = cdev;
1396 ddp->pdev = cdev->pdev;
1397 ddp->llimit = llimit;
1398 ddp->ulimit = ulimit;
1399 ddp->max_txsz = min_t(unsigned int, max_txsz, ULP2_MAX_PKT_SIZE);
1400 ddp->max_rxsz = min_t(unsigned int, max_rxsz, ULP2_MAX_PKT_SIZE);
1401 ddp->nppods = ppmax;
1402 ddp->idx_last = ppmax;
1403 ddp->idx_bits = bits;
1404 ddp->idx_mask = (1 << bits) - 1;
1405 ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1;
1406
1407 cdev->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
1408 cdev->tag_format.rsvd_bits = ddp->idx_bits;
1409 cdev->tag_format.rsvd_shift = PPOD_IDX_SHIFT;
1410 cdev->tag_format.rsvd_mask = (1 << cdev->tag_format.rsvd_bits) - 1;
1411
1412 pr_info("%s tag format, sw %u, rsvd %u,%u, mask 0x%x.\n",
1413 cdev->ports[0]->name, cdev->tag_format.sw_bits,
1414 cdev->tag_format.rsvd_bits, cdev->tag_format.rsvd_shift,
1415 cdev->tag_format.rsvd_mask);
1416
1417 cdev->tx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1418 ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
1419 cdev->rx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1420 ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);
1421
1422 log_debug(1 << CXGBI_DBG_DDP,
1423 "%s max payload size: %u/%u, %u/%u.\n",
1424 cdev->ports[0]->name, cdev->tx_max_size, ddp->max_txsz,
1425 cdev->rx_max_size, ddp->max_rxsz);
1426 return 0;
1427 }
1428 EXPORT_SYMBOL_GPL(cxgbi_ddp_init);
1429
1430 /*
1431 * APIs interacting with open-iscsi libraries
1432 */
1433
1434 static unsigned char padding[4];
1435
1436 static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1437 {
1438 struct scsi_cmnd *sc = task->sc;
1439 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1440 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1441 struct cxgbi_hba *chba = cconn->chba;
1442 struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1443 u32 tag = ntohl((__force u32)hdr_itt);
1444
1445 log_debug(1 << CXGBI_DBG_DDP,
1446 "cdev 0x%p, release tag 0x%x.\n", chba->cdev, tag);
1447 if (sc &&
1448 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
1449 cxgbi_is_ddp_tag(tformat, tag))
1450 ddp_tag_release(chba, tag);
1451 }
1452
1453 static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1454 {
1455 struct scsi_cmnd *sc = task->sc;
1456 struct iscsi_conn *conn = task->conn;
1457 struct iscsi_session *sess = conn->session;
1458 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1459 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1460 struct cxgbi_hba *chba = cconn->chba;
1461 struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1462 u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
1463 u32 tag = 0;
1464 int err = -EINVAL;
1465
1466 if (sc &&
1467 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)) {
1468 err = cxgbi_ddp_reserve(cconn->cep->csk, &tag, sw_tag,
1469 scsi_in(sc)->length,
1470 scsi_in(sc)->table.sgl,
1471 scsi_in(sc)->table.nents,
1472 GFP_ATOMIC);
1473 if (err < 0)
1474 log_debug(1 << CXGBI_DBG_DDP,
1475 "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1476 cconn->cep->csk, task, scsi_in(sc)->length,
1477 scsi_in(sc)->table.nents);
1478 }
1479
1480 if (err < 0)
1481 tag = cxgbi_set_non_ddp_tag(tformat, sw_tag);
1482 /* the itt need to sent in big-endian order */
1483 *hdr_itt = (__force itt_t)htonl(tag);
1484
1485 log_debug(1 << CXGBI_DBG_DDP,
1486 "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1487 chba->cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1488 return 0;
1489 }
1490
1491 void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1492 {
1493 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1494 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1495 struct cxgbi_device *cdev = cconn->chba->cdev;
1496 u32 tag = ntohl((__force u32) itt);
1497 u32 sw_bits;
1498
1499 sw_bits = cxgbi_tag_nonrsvd_bits(&cdev->tag_format, tag);
1500 if (idx)
1501 *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
1502 if (age)
1503 *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
1504
1505 log_debug(1 << CXGBI_DBG_DDP,
1506 "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1507 cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1508 age ? *age : 0xFF);
1509 }
1510 EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1511
1512 void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1513 {
1514 struct iscsi_conn *conn = csk->user_data;
1515
1516 if (conn) {
1517 log_debug(1 << CXGBI_DBG_SOCK,
1518 "csk 0x%p, cid %d.\n", csk, conn->id);
1519 iscsi_conn_queue_work(conn);
1520 }
1521 }
1522 EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1523
1524 /*
1525 * pdu receive, interact with libiscsi_tcp
1526 */
1527 static inline int read_pdu_skb(struct iscsi_conn *conn,
1528 struct sk_buff *skb,
1529 unsigned int offset,
1530 int offloaded)
1531 {
1532 int status = 0;
1533 int bytes_read;
1534
1535 bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1536 switch (status) {
1537 case ISCSI_TCP_CONN_ERR:
1538 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1539 skb, offset, offloaded);
1540 return -EIO;
1541 case ISCSI_TCP_SUSPENDED:
1542 log_debug(1 << CXGBI_DBG_PDU_RX,
1543 "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1544 skb, offset, offloaded, bytes_read);
1545 /* no transfer - just have caller flush queue */
1546 return bytes_read;
1547 case ISCSI_TCP_SKB_DONE:
1548 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1549 skb, offset, offloaded);
1550 /*
1551 * pdus should always fit in the skb and we should get
1552 * segment done notifcation.
1553 */
1554 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1555 return -EFAULT;
1556 case ISCSI_TCP_SEGMENT_DONE:
1557 log_debug(1 << CXGBI_DBG_PDU_RX,
1558 "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1559 skb, offset, offloaded, bytes_read);
1560 return bytes_read;
1561 default:
1562 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1563 skb, offset, offloaded, status);
1564 return -EINVAL;
1565 }
1566 }
1567
1568 static int skb_read_pdu_bhs(struct iscsi_conn *conn, struct sk_buff *skb)
1569 {
1570 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1571
1572 log_debug(1 << CXGBI_DBG_PDU_RX,
1573 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1574 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1575
1576 if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1577 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1578 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1579 return -EIO;
1580 }
1581
1582 if (conn->hdrdgst_en &&
1583 cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1584 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1585 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1586 return -EIO;
1587 }
1588
1589 return read_pdu_skb(conn, skb, 0, 0);
1590 }
1591
1592 static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1593 struct sk_buff *skb, unsigned int offset)
1594 {
1595 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1596 bool offloaded = 0;
1597 int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1598
1599 log_debug(1 << CXGBI_DBG_PDU_RX,
1600 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1601 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1602
1603 if (conn->datadgst_en &&
1604 cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1605 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1606 conn, lskb, cxgbi_skcb_flags(lskb));
1607 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1608 return -EIO;
1609 }
1610
1611 if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1612 return 0;
1613
1614 /* coalesced, add header digest length */
1615 if (lskb == skb && conn->hdrdgst_en)
1616 offset += ISCSI_DIGEST_SIZE;
1617
1618 if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1619 offloaded = 1;
1620
1621 if (opcode == ISCSI_OP_SCSI_DATA_IN)
1622 log_debug(1 << CXGBI_DBG_PDU_RX,
1623 "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1624 skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1625 tcp_conn->in.datalen, offloaded ? "is" : "not");
1626
1627 return read_pdu_skb(conn, skb, offset, offloaded);
1628 }
1629
1630 static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1631 {
1632 struct cxgbi_device *cdev = csk->cdev;
1633 int must_send;
1634 u32 credits;
1635
1636 log_debug(1 << CXGBI_DBG_PDU_RX,
1637 "csk 0x%p,%u,0x%lu,%u, seq %u, wup %u, thre %u, %u.\n",
1638 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1639 csk->rcv_wup, cdev->rx_credit_thres,
1640 cdev->rcv_win);
1641
1642 if (csk->state != CTP_ESTABLISHED)
1643 return;
1644
1645 credits = csk->copied_seq - csk->rcv_wup;
1646 if (unlikely(!credits))
1647 return;
1648 if (unlikely(cdev->rx_credit_thres == 0))
1649 return;
1650
1651 must_send = credits + 16384 >= cdev->rcv_win;
1652 if (must_send || credits >= cdev->rx_credit_thres)
1653 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1654 }
1655
1656 void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1657 {
1658 struct cxgbi_device *cdev = csk->cdev;
1659 struct iscsi_conn *conn = csk->user_data;
1660 struct sk_buff *skb;
1661 unsigned int read = 0;
1662 int err = 0;
1663
1664 log_debug(1 << CXGBI_DBG_PDU_RX,
1665 "csk 0x%p, conn 0x%p.\n", csk, conn);
1666
1667 if (unlikely(!conn || conn->suspend_rx)) {
1668 log_debug(1 << CXGBI_DBG_PDU_RX,
1669 "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1670 csk, conn, conn ? conn->id : 0xFF,
1671 conn ? conn->suspend_rx : 0xFF);
1672 return;
1673 }
1674
1675 while (!err) {
1676 skb = skb_peek(&csk->receive_queue);
1677 if (!skb ||
1678 !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1679 if (skb)
1680 log_debug(1 << CXGBI_DBG_PDU_RX,
1681 "skb 0x%p, NOT ready 0x%lx.\n",
1682 skb, cxgbi_skcb_flags(skb));
1683 break;
1684 }
1685 __skb_unlink(skb, &csk->receive_queue);
1686
1687 read += cxgbi_skcb_rx_pdulen(skb);
1688 log_debug(1 << CXGBI_DBG_PDU_RX,
1689 "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1690 csk, skb, skb->len, cxgbi_skcb_flags(skb),
1691 cxgbi_skcb_rx_pdulen(skb));
1692
1693 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1694 err = skb_read_pdu_bhs(conn, skb);
1695 if (err < 0) {
1696 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1697 "f 0x%lx, plen %u.\n",
1698 csk, skb, skb->len,
1699 cxgbi_skcb_flags(skb),
1700 cxgbi_skcb_rx_pdulen(skb));
1701 goto skb_done;
1702 }
1703 err = skb_read_pdu_data(conn, skb, skb,
1704 err + cdev->skb_rx_extra);
1705 if (err < 0)
1706 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1707 "f 0x%lx, plen %u.\n",
1708 csk, skb, skb->len,
1709 cxgbi_skcb_flags(skb),
1710 cxgbi_skcb_rx_pdulen(skb));
1711 } else {
1712 err = skb_read_pdu_bhs(conn, skb);
1713 if (err < 0) {
1714 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1715 "f 0x%lx, plen %u.\n",
1716 csk, skb, skb->len,
1717 cxgbi_skcb_flags(skb),
1718 cxgbi_skcb_rx_pdulen(skb));
1719 goto skb_done;
1720 }
1721
1722 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1723 struct sk_buff *dskb;
1724
1725 dskb = skb_peek(&csk->receive_queue);
1726 if (!dskb) {
1727 pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1728 " plen %u, NO data.\n",
1729 csk, skb, skb->len,
1730 cxgbi_skcb_flags(skb),
1731 cxgbi_skcb_rx_pdulen(skb));
1732 err = -EIO;
1733 goto skb_done;
1734 }
1735 __skb_unlink(dskb, &csk->receive_queue);
1736
1737 err = skb_read_pdu_data(conn, skb, dskb, 0);
1738 if (err < 0)
1739 pr_err("data, csk 0x%p, skb 0x%p,%u, "
1740 "f 0x%lx, plen %u, dskb 0x%p,"
1741 "%u.\n",
1742 csk, skb, skb->len,
1743 cxgbi_skcb_flags(skb),
1744 cxgbi_skcb_rx_pdulen(skb),
1745 dskb, dskb->len);
1746 __kfree_skb(dskb);
1747 } else
1748 err = skb_read_pdu_data(conn, skb, skb, 0);
1749 }
1750 skb_done:
1751 __kfree_skb(skb);
1752
1753 if (err < 0)
1754 break;
1755 }
1756
1757 log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
1758 if (read) {
1759 csk->copied_seq += read;
1760 csk_return_rx_credits(csk, read);
1761 conn->rxdata_octets += read;
1762 }
1763
1764 if (err < 0) {
1765 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
1766 csk, conn, err, read);
1767 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1768 }
1769 }
1770 EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
1771
1772 static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
1773 unsigned int offset, unsigned int *off,
1774 struct scatterlist **sgp)
1775 {
1776 int i;
1777 struct scatterlist *sg;
1778
1779 for_each_sg(sgl, sg, sgcnt, i) {
1780 if (offset < sg->length) {
1781 *off = offset;
1782 *sgp = sg;
1783 return 0;
1784 }
1785 offset -= sg->length;
1786 }
1787 return -EFAULT;
1788 }
1789
1790 static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
1791 unsigned int dlen, struct page_frag *frags,
1792 int frag_max)
1793 {
1794 unsigned int datalen = dlen;
1795 unsigned int sglen = sg->length - sgoffset;
1796 struct page *page = sg_page(sg);
1797 int i;
1798
1799 i = 0;
1800 do {
1801 unsigned int copy;
1802
1803 if (!sglen) {
1804 sg = sg_next(sg);
1805 if (!sg) {
1806 pr_warn("sg %d NULL, len %u/%u.\n",
1807 i, datalen, dlen);
1808 return -EINVAL;
1809 }
1810 sgoffset = 0;
1811 sglen = sg->length;
1812 page = sg_page(sg);
1813
1814 }
1815 copy = min(datalen, sglen);
1816 if (i && page == frags[i - 1].page &&
1817 sgoffset + sg->offset ==
1818 frags[i - 1].offset + frags[i - 1].size) {
1819 frags[i - 1].size += copy;
1820 } else {
1821 if (i >= frag_max) {
1822 pr_warn("too many pages %u, dlen %u.\n",
1823 frag_max, dlen);
1824 return -EINVAL;
1825 }
1826
1827 frags[i].page = page;
1828 frags[i].offset = sg->offset + sgoffset;
1829 frags[i].size = copy;
1830 i++;
1831 }
1832 datalen -= copy;
1833 sgoffset += copy;
1834 sglen -= copy;
1835 } while (datalen);
1836
1837 return i;
1838 }
1839
1840 int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
1841 {
1842 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1843 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1844 struct cxgbi_device *cdev = cconn->chba->cdev;
1845 struct iscsi_conn *conn = task->conn;
1846 struct iscsi_tcp_task *tcp_task = task->dd_data;
1847 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1848 struct scsi_cmnd *sc = task->sc;
1849 int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
1850
1851 tcp_task->dd_data = tdata;
1852 task->hdr = NULL;
1853
1854 if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
1855 (opcode == ISCSI_OP_SCSI_DATA_OUT ||
1856 (opcode == ISCSI_OP_SCSI_CMD &&
1857 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
1858 /* data could goes into skb head */
1859 headroom += min_t(unsigned int,
1860 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
1861 conn->max_xmit_dlength);
1862
1863 tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
1864 if (!tdata->skb) {
1865 pr_warn("alloc skb %u+%u, opcode 0x%x failed.\n",
1866 cdev->skb_tx_rsvd, headroom, opcode);
1867 return -ENOMEM;
1868 }
1869
1870 skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
1871 task->hdr = (struct iscsi_hdr *)tdata->skb->data;
1872 task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
1873
1874 /* data_out uses scsi_cmd's itt */
1875 if (opcode != ISCSI_OP_SCSI_DATA_OUT)
1876 task_reserve_itt(task, &task->hdr->itt);
1877
1878 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1879 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
1880 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
1881 conn->max_xmit_dlength, ntohl(task->hdr->itt));
1882
1883 return 0;
1884 }
1885 EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
1886
1887 static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
1888 {
1889 if (hcrc || dcrc) {
1890 u8 submode = 0;
1891
1892 if (hcrc)
1893 submode |= 1;
1894 if (dcrc)
1895 submode |= 2;
1896 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
1897 } else
1898 cxgbi_skcb_ulp_mode(skb) = 0;
1899 }
1900
1901 int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
1902 unsigned int count)
1903 {
1904 struct iscsi_conn *conn = task->conn;
1905 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1906 struct sk_buff *skb = tdata->skb;
1907 unsigned int datalen = count;
1908 int i, padlen = iscsi_padding(count);
1909 struct page *pg;
1910
1911 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1912 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
1913 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
1914 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
1915
1916 skb_put(skb, task->hdr_len);
1917 tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
1918 if (!count)
1919 return 0;
1920
1921 if (task->sc) {
1922 struct scsi_data_buffer *sdb = scsi_out(task->sc);
1923 struct scatterlist *sg = NULL;
1924 int err;
1925
1926 tdata->offset = offset;
1927 tdata->count = count;
1928 err = sgl_seek_offset(
1929 sdb->table.sgl, sdb->table.nents,
1930 tdata->offset, &tdata->sgoffset, &sg);
1931 if (err < 0) {
1932 pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
1933 sdb->table.nents, tdata->offset, sdb->length);
1934 return err;
1935 }
1936 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
1937 tdata->frags, MAX_PDU_FRAGS);
1938 if (err < 0) {
1939 pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
1940 sdb->table.nents, tdata->offset, tdata->count);
1941 return err;
1942 }
1943 tdata->nr_frags = err;
1944
1945 if (tdata->nr_frags > MAX_SKB_FRAGS ||
1946 (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
1947 char *dst = skb->data + task->hdr_len;
1948 struct page_frag *frag = tdata->frags;
1949
1950 /* data fits in the skb's headroom */
1951 for (i = 0; i < tdata->nr_frags; i++, frag++) {
1952 char *src = kmap_atomic(frag->page,
1953 KM_SOFTIRQ0);
1954
1955 memcpy(dst, src+frag->offset, frag->size);
1956 dst += frag->size;
1957 kunmap_atomic(src, KM_SOFTIRQ0);
1958 }
1959 if (padlen) {
1960 memset(dst, 0, padlen);
1961 padlen = 0;
1962 }
1963 skb_put(skb, count + padlen);
1964 } else {
1965 /* data fit into frag_list */
1966 for (i = 0; i < tdata->nr_frags; i++) {
1967 __skb_fill_page_desc(skb, i,
1968 tdata->frags[i].page,
1969 tdata->frags[i].offset,
1970 tdata->frags[i].size);
1971 skb_frag_ref(skb, i);
1972 }
1973 skb_shinfo(skb)->nr_frags = tdata->nr_frags;
1974 skb->len += count;
1975 skb->data_len += count;
1976 skb->truesize += count;
1977 }
1978
1979 } else {
1980 pg = virt_to_page(task->data);
1981
1982 get_page(pg);
1983 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
1984 count);
1985 skb->len += count;
1986 skb->data_len += count;
1987 skb->truesize += count;
1988 }
1989
1990 if (padlen) {
1991 i = skb_shinfo(skb)->nr_frags;
1992 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
1993 virt_to_page(padding), offset_in_page(padding),
1994 padlen);
1995
1996 skb->data_len += padlen;
1997 skb->truesize += padlen;
1998 skb->len += padlen;
1999 }
2000
2001 return 0;
2002 }
2003 EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
2004
2005 int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2006 {
2007 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2008 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2009 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2010 struct sk_buff *skb = tdata->skb;
2011 unsigned int datalen;
2012 int err;
2013
2014 if (!skb) {
2015 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2016 "task 0x%p, skb NULL.\n", task);
2017 return 0;
2018 }
2019
2020 datalen = skb->data_len;
2021 tdata->skb = NULL;
2022 err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2023 if (err > 0) {
2024 int pdulen = err;
2025
2026 log_debug(1 << CXGBI_DBG_PDU_TX,
2027 "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2028 task, task->sc, skb, skb->len, skb->data_len, err);
2029
2030 if (task->conn->hdrdgst_en)
2031 pdulen += ISCSI_DIGEST_SIZE;
2032
2033 if (datalen && task->conn->datadgst_en)
2034 pdulen += ISCSI_DIGEST_SIZE;
2035
2036 task->conn->txdata_octets += pdulen;
2037 return 0;
2038 }
2039
2040 if (err == -EAGAIN || err == -ENOBUFS) {
2041 log_debug(1 << CXGBI_DBG_PDU_TX,
2042 "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2043 task, skb, skb->len, skb->data_len, err);
2044 /* reset skb to send when we are called again */
2045 tdata->skb = skb;
2046 return err;
2047 }
2048
2049 kfree_skb(skb);
2050 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2051 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2052 task->itt, skb, skb->len, skb->data_len, err);
2053 iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2054 iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2055 return err;
2056 }
2057 EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2058
2059 void cxgbi_cleanup_task(struct iscsi_task *task)
2060 {
2061 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2062
2063 log_debug(1 << CXGBI_DBG_ISCSI,
2064 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2065 task, tdata->skb, task->hdr_itt);
2066
2067 /* never reached the xmit task callout */
2068 if (tdata->skb)
2069 __kfree_skb(tdata->skb);
2070 memset(tdata, 0, sizeof(*tdata));
2071
2072 task_release_itt(task, task->hdr_itt);
2073 iscsi_tcp_cleanup_task(task);
2074 }
2075 EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2076
2077 void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2078 struct iscsi_stats *stats)
2079 {
2080 struct iscsi_conn *conn = cls_conn->dd_data;
2081
2082 stats->txdata_octets = conn->txdata_octets;
2083 stats->rxdata_octets = conn->rxdata_octets;
2084 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2085 stats->dataout_pdus = conn->dataout_pdus_cnt;
2086 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2087 stats->datain_pdus = conn->datain_pdus_cnt;
2088 stats->r2t_pdus = conn->r2t_pdus_cnt;
2089 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2090 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2091 stats->digest_err = 0;
2092 stats->timeout_err = 0;
2093 stats->custom_length = 1;
2094 strcpy(stats->custom[0].desc, "eh_abort_cnt");
2095 stats->custom[0].value = conn->eh_abort_cnt;
2096 }
2097 EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2098
2099 static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2100 {
2101 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2102 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2103 struct cxgbi_device *cdev = cconn->chba->cdev;
2104 unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2105 unsigned int max_def = 512 * MAX_SKB_FRAGS;
2106 unsigned int max = max(max_def, headroom);
2107
2108 max = min(cconn->chba->cdev->tx_max_size, max);
2109 if (conn->max_xmit_dlength)
2110 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2111 else
2112 conn->max_xmit_dlength = max;
2113 cxgbi_align_pdu_size(conn->max_xmit_dlength);
2114
2115 return 0;
2116 }
2117
2118 static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2119 {
2120 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2121 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2122 unsigned int max = cconn->chba->cdev->rx_max_size;
2123
2124 cxgbi_align_pdu_size(max);
2125
2126 if (conn->max_recv_dlength) {
2127 if (conn->max_recv_dlength > max) {
2128 pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2129 conn->max_recv_dlength, max);
2130 return -EINVAL;
2131 }
2132 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2133 cxgbi_align_pdu_size(conn->max_recv_dlength);
2134 } else
2135 conn->max_recv_dlength = max;
2136
2137 return 0;
2138 }
2139
2140 int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2141 enum iscsi_param param, char *buf, int buflen)
2142 {
2143 struct iscsi_conn *conn = cls_conn->dd_data;
2144 struct iscsi_session *session = conn->session;
2145 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2146 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2147 struct cxgbi_sock *csk = cconn->cep->csk;
2148 int value, err = 0;
2149
2150 log_debug(1 << CXGBI_DBG_ISCSI,
2151 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2152 cls_conn, param, buflen, buf);
2153
2154 switch (param) {
2155 case ISCSI_PARAM_HDRDGST_EN:
2156 err = iscsi_set_param(cls_conn, param, buf, buflen);
2157 if (!err && conn->hdrdgst_en)
2158 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2159 conn->hdrdgst_en,
2160 conn->datadgst_en, 0);
2161 break;
2162 case ISCSI_PARAM_DATADGST_EN:
2163 err = iscsi_set_param(cls_conn, param, buf, buflen);
2164 if (!err && conn->datadgst_en)
2165 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2166 conn->hdrdgst_en,
2167 conn->datadgst_en, 0);
2168 break;
2169 case ISCSI_PARAM_MAX_R2T:
2170 sscanf(buf, "%d", &value);
2171 if (value <= 0 || !is_power_of_2(value))
2172 return -EINVAL;
2173 if (session->max_r2t == value)
2174 break;
2175 iscsi_tcp_r2tpool_free(session);
2176 err = iscsi_set_param(cls_conn, param, buf, buflen);
2177 if (!err && iscsi_tcp_r2tpool_alloc(session))
2178 return -ENOMEM;
2179 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2180 err = iscsi_set_param(cls_conn, param, buf, buflen);
2181 if (!err)
2182 err = cxgbi_conn_max_recv_dlength(conn);
2183 break;
2184 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2185 err = iscsi_set_param(cls_conn, param, buf, buflen);
2186 if (!err)
2187 err = cxgbi_conn_max_xmit_dlength(conn);
2188 break;
2189 default:
2190 return iscsi_set_param(cls_conn, param, buf, buflen);
2191 }
2192 return err;
2193 }
2194 EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2195
2196 int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2197 char *buf)
2198 {
2199 struct cxgbi_endpoint *cep = ep->dd_data;
2200 struct cxgbi_sock *csk;
2201 int len;
2202
2203 log_debug(1 << CXGBI_DBG_ISCSI,
2204 "cls_conn 0x%p, param %d.\n", ep, param);
2205
2206 switch (param) {
2207 case ISCSI_PARAM_CONN_PORT:
2208 case ISCSI_PARAM_CONN_ADDRESS:
2209 if (!cep)
2210 return -ENOTCONN;
2211
2212 csk = cep->csk;
2213 if (!csk)
2214 return -ENOTCONN;
2215
2216 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2217 &csk->daddr, param, buf);
2218 default:
2219 return -ENOSYS;
2220 }
2221 return len;
2222 }
2223 EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
2224
2225 struct iscsi_cls_conn *
2226 cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2227 {
2228 struct iscsi_cls_conn *cls_conn;
2229 struct iscsi_conn *conn;
2230 struct iscsi_tcp_conn *tcp_conn;
2231 struct cxgbi_conn *cconn;
2232
2233 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2234 if (!cls_conn)
2235 return NULL;
2236
2237 conn = cls_conn->dd_data;
2238 tcp_conn = conn->dd_data;
2239 cconn = tcp_conn->dd_data;
2240 cconn->iconn = conn;
2241
2242 log_debug(1 << CXGBI_DBG_ISCSI,
2243 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2244 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2245
2246 return cls_conn;
2247 }
2248 EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2249
2250 int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2251 struct iscsi_cls_conn *cls_conn,
2252 u64 transport_eph, int is_leading)
2253 {
2254 struct iscsi_conn *conn = cls_conn->dd_data;
2255 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2256 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2257 struct iscsi_endpoint *ep;
2258 struct cxgbi_endpoint *cep;
2259 struct cxgbi_sock *csk;
2260 int err;
2261
2262 ep = iscsi_lookup_endpoint(transport_eph);
2263 if (!ep)
2264 return -EINVAL;
2265
2266 /* setup ddp pagesize */
2267 cep = ep->dd_data;
2268 csk = cep->csk;
2269 err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid, page_idx, 0);
2270 if (err < 0)
2271 return err;
2272
2273 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2274 if (err)
2275 return -EINVAL;
2276
2277 /* calculate the tag idx bits needed for this conn based on cmds_max */
2278 cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2279
2280 write_lock_bh(&csk->callback_lock);
2281 csk->user_data = conn;
2282 cconn->chba = cep->chba;
2283 cconn->cep = cep;
2284 cep->cconn = cconn;
2285 write_unlock_bh(&csk->callback_lock);
2286
2287 cxgbi_conn_max_xmit_dlength(conn);
2288 cxgbi_conn_max_recv_dlength(conn);
2289
2290 log_debug(1 << CXGBI_DBG_ISCSI,
2291 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2292 cls_session, cls_conn, ep, cconn, csk);
2293 /* init recv engine */
2294 iscsi_tcp_hdr_recv_prep(tcp_conn);
2295
2296 return 0;
2297 }
2298 EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2299
2300 struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2301 u16 cmds_max, u16 qdepth,
2302 u32 initial_cmdsn)
2303 {
2304 struct cxgbi_endpoint *cep;
2305 struct cxgbi_hba *chba;
2306 struct Scsi_Host *shost;
2307 struct iscsi_cls_session *cls_session;
2308 struct iscsi_session *session;
2309
2310 if (!ep) {
2311 pr_err("missing endpoint.\n");
2312 return NULL;
2313 }
2314
2315 cep = ep->dd_data;
2316 chba = cep->chba;
2317 shost = chba->shost;
2318
2319 BUG_ON(chba != iscsi_host_priv(shost));
2320
2321 cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2322 cmds_max, 0,
2323 sizeof(struct iscsi_tcp_task) +
2324 sizeof(struct cxgbi_task_data),
2325 initial_cmdsn, ISCSI_MAX_TARGET);
2326 if (!cls_session)
2327 return NULL;
2328
2329 session = cls_session->dd_data;
2330 if (iscsi_tcp_r2tpool_alloc(session))
2331 goto remove_session;
2332
2333 log_debug(1 << CXGBI_DBG_ISCSI,
2334 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2335 return cls_session;
2336
2337 remove_session:
2338 iscsi_session_teardown(cls_session);
2339 return NULL;
2340 }
2341 EXPORT_SYMBOL_GPL(cxgbi_create_session);
2342
2343 void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2344 {
2345 log_debug(1 << CXGBI_DBG_ISCSI,
2346 "cls sess 0x%p.\n", cls_session);
2347
2348 iscsi_tcp_r2tpool_free(cls_session->dd_data);
2349 iscsi_session_teardown(cls_session);
2350 }
2351 EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2352
2353 int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2354 char *buf, int buflen)
2355 {
2356 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2357
2358 if (!chba->ndev) {
2359 shost_printk(KERN_ERR, shost, "Could not get host param. "
2360 "netdev for host not set.\n");
2361 return -ENODEV;
2362 }
2363
2364 log_debug(1 << CXGBI_DBG_ISCSI,
2365 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2366 shost, chba, chba->ndev->name, param, buflen, buf);
2367
2368 switch (param) {
2369 case ISCSI_HOST_PARAM_IPADDRESS:
2370 {
2371 __be32 addr = in_aton(buf);
2372 log_debug(1 << CXGBI_DBG_ISCSI,
2373 "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2374 cxgbi_set_iscsi_ipv4(chba, addr);
2375 return 0;
2376 }
2377 case ISCSI_HOST_PARAM_HWADDRESS:
2378 case ISCSI_HOST_PARAM_NETDEV_NAME:
2379 return 0;
2380 default:
2381 return iscsi_host_set_param(shost, param, buf, buflen);
2382 }
2383 }
2384 EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2385
2386 int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2387 char *buf)
2388 {
2389 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2390 int len = 0;
2391
2392 if (!chba->ndev) {
2393 shost_printk(KERN_ERR, shost, "Could not get host param. "
2394 "netdev for host not set.\n");
2395 return -ENODEV;
2396 }
2397
2398 log_debug(1 << CXGBI_DBG_ISCSI,
2399 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2400 shost, chba, chba->ndev->name, param);
2401
2402 switch (param) {
2403 case ISCSI_HOST_PARAM_HWADDRESS:
2404 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2405 break;
2406 case ISCSI_HOST_PARAM_NETDEV_NAME:
2407 len = sprintf(buf, "%s\n", chba->ndev->name);
2408 break;
2409 case ISCSI_HOST_PARAM_IPADDRESS:
2410 {
2411 __be32 addr;
2412
2413 addr = cxgbi_get_iscsi_ipv4(chba);
2414 len = sprintf(buf, "%pI4", &addr);
2415 log_debug(1 << CXGBI_DBG_ISCSI,
2416 "hba %s, ipv4 %pI4.\n", chba->ndev->name, &addr);
2417 break;
2418 }
2419 default:
2420 return iscsi_host_get_param(shost, param, buf);
2421 }
2422
2423 return len;
2424 }
2425 EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2426
2427 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2428 struct sockaddr *dst_addr,
2429 int non_blocking)
2430 {
2431 struct iscsi_endpoint *ep;
2432 struct cxgbi_endpoint *cep;
2433 struct cxgbi_hba *hba = NULL;
2434 struct cxgbi_sock *csk;
2435 int err = -EINVAL;
2436
2437 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2438 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2439 shost, non_blocking, dst_addr);
2440
2441 if (shost) {
2442 hba = iscsi_host_priv(shost);
2443 if (!hba) {
2444 pr_info("shost 0x%p, priv NULL.\n", shost);
2445 goto err_out;
2446 }
2447 }
2448
2449 csk = cxgbi_check_route(dst_addr);
2450 if (IS_ERR(csk))
2451 return (struct iscsi_endpoint *)csk;
2452 cxgbi_sock_get(csk);
2453
2454 if (!hba)
2455 hba = csk->cdev->hbas[csk->port_id];
2456 else if (hba != csk->cdev->hbas[csk->port_id]) {
2457 pr_info("Could not connect through requested host %u"
2458 "hba 0x%p != 0x%p (%u).\n",
2459 shost->host_no, hba,
2460 csk->cdev->hbas[csk->port_id], csk->port_id);
2461 err = -ENOSPC;
2462 goto release_conn;
2463 }
2464
2465 err = sock_get_port(csk);
2466 if (err)
2467 goto release_conn;
2468
2469 cxgbi_sock_set_state(csk, CTP_CONNECTING);
2470 err = csk->cdev->csk_init_act_open(csk);
2471 if (err)
2472 goto release_conn;
2473
2474 if (cxgbi_sock_is_closing(csk)) {
2475 err = -ENOSPC;
2476 pr_info("csk 0x%p is closing.\n", csk);
2477 goto release_conn;
2478 }
2479
2480 ep = iscsi_create_endpoint(sizeof(*cep));
2481 if (!ep) {
2482 err = -ENOMEM;
2483 pr_info("iscsi alloc ep, OOM.\n");
2484 goto release_conn;
2485 }
2486
2487 cep = ep->dd_data;
2488 cep->csk = csk;
2489 cep->chba = hba;
2490
2491 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2492 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2493 ep, cep, csk, hba, hba->ndev->name);
2494 return ep;
2495
2496 release_conn:
2497 cxgbi_sock_put(csk);
2498 cxgbi_sock_closed(csk);
2499 err_out:
2500 return ERR_PTR(err);
2501 }
2502 EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2503
2504 int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2505 {
2506 struct cxgbi_endpoint *cep = ep->dd_data;
2507 struct cxgbi_sock *csk = cep->csk;
2508
2509 if (!cxgbi_sock_is_established(csk))
2510 return 0;
2511 return 1;
2512 }
2513 EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2514
2515 void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2516 {
2517 struct cxgbi_endpoint *cep = ep->dd_data;
2518 struct cxgbi_conn *cconn = cep->cconn;
2519 struct cxgbi_sock *csk = cep->csk;
2520
2521 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2522 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2523 ep, cep, cconn, csk, csk->state, csk->flags);
2524
2525 if (cconn && cconn->iconn) {
2526 iscsi_suspend_tx(cconn->iconn);
2527 write_lock_bh(&csk->callback_lock);
2528 cep->csk->user_data = NULL;
2529 cconn->cep = NULL;
2530 write_unlock_bh(&csk->callback_lock);
2531 }
2532 iscsi_destroy_endpoint(ep);
2533
2534 if (likely(csk->state >= CTP_ESTABLISHED))
2535 need_active_close(csk);
2536 else
2537 cxgbi_sock_closed(csk);
2538
2539 cxgbi_sock_put(csk);
2540 }
2541 EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2542
2543 int cxgbi_iscsi_init(struct iscsi_transport *itp,
2544 struct scsi_transport_template **stt)
2545 {
2546 *stt = iscsi_register_transport(itp);
2547 if (*stt == NULL) {
2548 pr_err("unable to register %s transport 0x%p.\n",
2549 itp->name, itp);
2550 return -ENODEV;
2551 }
2552 log_debug(1 << CXGBI_DBG_ISCSI,
2553 "%s, registered iscsi transport 0x%p.\n",
2554 itp->name, stt);
2555 return 0;
2556 }
2557 EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2558
2559 void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2560 struct scsi_transport_template **stt)
2561 {
2562 if (*stt) {
2563 log_debug(1 << CXGBI_DBG_ISCSI,
2564 "de-register transport 0x%p, %s, stt 0x%p.\n",
2565 itp, itp->name, *stt);
2566 *stt = NULL;
2567 iscsi_unregister_transport(itp);
2568 }
2569 }
2570 EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2571
2572 mode_t cxgbi_attr_is_visible(int param_type, int param)
2573 {
2574 switch (param_type) {
2575 case ISCSI_HOST_PARAM:
2576 switch (param) {
2577 case ISCSI_HOST_PARAM_NETDEV_NAME:
2578 case ISCSI_HOST_PARAM_HWADDRESS:
2579 case ISCSI_HOST_PARAM_IPADDRESS:
2580 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2581 return S_IRUGO;
2582 default:
2583 return 0;
2584 }
2585 case ISCSI_PARAM:
2586 switch (param) {
2587 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2588 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2589 case ISCSI_PARAM_HDRDGST_EN:
2590 case ISCSI_PARAM_DATADGST_EN:
2591 case ISCSI_PARAM_CONN_ADDRESS:
2592 case ISCSI_PARAM_CONN_PORT:
2593 case ISCSI_PARAM_EXP_STATSN:
2594 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2595 case ISCSI_PARAM_PERSISTENT_PORT:
2596 case ISCSI_PARAM_PING_TMO:
2597 case ISCSI_PARAM_RECV_TMO:
2598 case ISCSI_PARAM_INITIAL_R2T_EN:
2599 case ISCSI_PARAM_MAX_R2T:
2600 case ISCSI_PARAM_IMM_DATA_EN:
2601 case ISCSI_PARAM_FIRST_BURST:
2602 case ISCSI_PARAM_MAX_BURST:
2603 case ISCSI_PARAM_PDU_INORDER_EN:
2604 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2605 case ISCSI_PARAM_ERL:
2606 case ISCSI_PARAM_TARGET_NAME:
2607 case ISCSI_PARAM_TPGT:
2608 case ISCSI_PARAM_USERNAME:
2609 case ISCSI_PARAM_PASSWORD:
2610 case ISCSI_PARAM_USERNAME_IN:
2611 case ISCSI_PARAM_PASSWORD_IN:
2612 case ISCSI_PARAM_FAST_ABORT:
2613 case ISCSI_PARAM_ABORT_TMO:
2614 case ISCSI_PARAM_LU_RESET_TMO:
2615 case ISCSI_PARAM_TGT_RESET_TMO:
2616 case ISCSI_PARAM_IFACE_NAME:
2617 case ISCSI_PARAM_INITIATOR_NAME:
2618 return S_IRUGO;
2619 default:
2620 return 0;
2621 }
2622 }
2623
2624 return 0;
2625 }
2626 EXPORT_SYMBOL_GPL(cxgbi_attr_is_visible);
2627
2628 static int __init libcxgbi_init_module(void)
2629 {
2630 sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
2631 sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
2632
2633 pr_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
2634 ISCSI_ITT_MASK, sw_tag_idx_bits,
2635 ISCSI_AGE_MASK, sw_tag_age_bits);
2636
2637 ddp_setup_host_page_size();
2638 return 0;
2639 }
2640
2641 static void __exit libcxgbi_exit_module(void)
2642 {
2643 cxgbi_device_unregister_all(0xFF);
2644 return;
2645 }
2646
2647 module_init(libcxgbi_init_module);
2648 module_exit(libcxgbi_exit_module);