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drm/radeon/kms: fix backend map typo on juniper
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / scsi / cxgbi / libcxgbi.c
blobde764ea7419d428d39372cf7390c1327ee782f19
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->daddr.sin_family = daddr->sin_family;
534 csk->saddr.sin_addr.s_addr = rt->rt_src;
535
536 return csk;
537
538 rel_rt:
539 ip_rt_put(rt);
540 if (csk)
541 cxgbi_sock_closed(csk);
542 err_out:
543 return ERR_PTR(err);
544 }
545
546 void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
547 unsigned int opt)
548 {
549 csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
550 dst_confirm(csk->dst);
551 smp_mb();
552 cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
553 }
554 EXPORT_SYMBOL_GPL(cxgbi_sock_established);
555
556 static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
557 {
558 log_debug(1 << CXGBI_DBG_SOCK,
559 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
560 csk, csk->state, csk->flags, csk->user_data);
561
562 if (csk->state != CTP_ESTABLISHED) {
563 read_lock_bh(&csk->callback_lock);
564 if (csk->user_data)
565 iscsi_conn_failure(csk->user_data,
566 ISCSI_ERR_CONN_FAILED);
567 read_unlock_bh(&csk->callback_lock);
568 }
569 }
570
571 void cxgbi_sock_closed(struct cxgbi_sock *csk)
572 {
573 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
574 csk, (csk)->state, (csk)->flags, (csk)->tid);
575 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
576 if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
577 return;
578 if (csk->saddr.sin_port)
579 sock_put_port(csk);
580 if (csk->dst)
581 dst_release(csk->dst);
582 csk->cdev->csk_release_offload_resources(csk);
583 cxgbi_sock_set_state(csk, CTP_CLOSED);
584 cxgbi_inform_iscsi_conn_closing(csk);
585 cxgbi_sock_put(csk);
586 }
587 EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
588
589 static void need_active_close(struct cxgbi_sock *csk)
590 {
591 int data_lost;
592 int close_req = 0;
593
594 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
595 csk, (csk)->state, (csk)->flags, (csk)->tid);
596 spin_lock_bh(&csk->lock);
597 dst_confirm(csk->dst);
598 data_lost = skb_queue_len(&csk->receive_queue);
599 __skb_queue_purge(&csk->receive_queue);
600
601 if (csk->state == CTP_ACTIVE_OPEN)
602 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
603 else if (csk->state == CTP_ESTABLISHED) {
604 close_req = 1;
605 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
606 } else if (csk->state == CTP_PASSIVE_CLOSE) {
607 close_req = 1;
608 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
609 }
610
611 if (close_req) {
612 if (data_lost)
613 csk->cdev->csk_send_abort_req(csk);
614 else
615 csk->cdev->csk_send_close_req(csk);
616 }
617
618 spin_unlock_bh(&csk->lock);
619 }
620
621 void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
622 {
623 pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
624 csk, csk->state, csk->flags,
625 &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
626 &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
627 errno);
628
629 cxgbi_sock_set_state(csk, CTP_CONNECTING);
630 csk->err = errno;
631 cxgbi_sock_closed(csk);
632 }
633 EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
634
635 void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
636 {
637 struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
638
639 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
640 csk, (csk)->state, (csk)->flags, (csk)->tid);
641 cxgbi_sock_get(csk);
642 spin_lock_bh(&csk->lock);
643 if (csk->state == CTP_ACTIVE_OPEN)
644 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
645 spin_unlock_bh(&csk->lock);
646 cxgbi_sock_put(csk);
647 __kfree_skb(skb);
648 }
649 EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
650
651 void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
652 {
653 cxgbi_sock_get(csk);
654 spin_lock_bh(&csk->lock);
655 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
656 if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_RCVD))
657 cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
658 else {
659 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_RCVD);
660 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
661 if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
662 pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
663 csk, csk->state, csk->flags, csk->tid);
664 cxgbi_sock_closed(csk);
665 }
666 }
667 spin_unlock_bh(&csk->lock);
668 cxgbi_sock_put(csk);
669 }
670 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
671
672 void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
673 {
674 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
675 csk, (csk)->state, (csk)->flags, (csk)->tid);
676 cxgbi_sock_get(csk);
677 spin_lock_bh(&csk->lock);
678
679 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
680 goto done;
681
682 switch (csk->state) {
683 case CTP_ESTABLISHED:
684 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
685 break;
686 case CTP_ACTIVE_CLOSE:
687 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
688 break;
689 case CTP_CLOSE_WAIT_1:
690 cxgbi_sock_closed(csk);
691 break;
692 case CTP_ABORTING:
693 break;
694 default:
695 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
696 csk, csk->state, csk->flags, csk->tid);
697 }
698 cxgbi_inform_iscsi_conn_closing(csk);
699 done:
700 spin_unlock_bh(&csk->lock);
701 cxgbi_sock_put(csk);
702 }
703 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
704
705 void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
706 {
707 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
708 csk, (csk)->state, (csk)->flags, (csk)->tid);
709 cxgbi_sock_get(csk);
710 spin_lock_bh(&csk->lock);
711
712 csk->snd_una = snd_nxt - 1;
713 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
714 goto done;
715
716 switch (csk->state) {
717 case CTP_ACTIVE_CLOSE:
718 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
719 break;
720 case CTP_CLOSE_WAIT_1:
721 case CTP_CLOSE_WAIT_2:
722 cxgbi_sock_closed(csk);
723 break;
724 case CTP_ABORTING:
725 break;
726 default:
727 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
728 csk, csk->state, csk->flags, csk->tid);
729 }
730 done:
731 spin_unlock_bh(&csk->lock);
732 cxgbi_sock_put(csk);
733 }
734 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
735
736 void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
737 unsigned int snd_una, int seq_chk)
738 {
739 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
740 "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
741 csk, csk->state, csk->flags, csk->tid, credits,
742 csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
743
744 spin_lock_bh(&csk->lock);
745
746 csk->wr_cred += credits;
747 if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
748 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
749
750 while (credits) {
751 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
752
753 if (unlikely(!p)) {
754 pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
755 csk, csk->state, csk->flags, csk->tid, credits,
756 csk->wr_cred, csk->wr_una_cred);
757 break;
758 }
759
760 if (unlikely(credits < p->csum)) {
761 pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
762 csk, csk->state, csk->flags, csk->tid,
763 credits, csk->wr_cred, csk->wr_una_cred,
764 p->csum);
765 p->csum -= credits;
766 break;
767 } else {
768 cxgbi_sock_dequeue_wr(csk);
769 credits -= p->csum;
770 kfree_skb(p);
771 }
772 }
773
774 cxgbi_sock_check_wr_invariants(csk);
775
776 if (seq_chk) {
777 if (unlikely(before(snd_una, csk->snd_una))) {
778 pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
779 csk, csk->state, csk->flags, csk->tid, snd_una,
780 csk->snd_una);
781 goto done;
782 }
783
784 if (csk->snd_una != snd_una) {
785 csk->snd_una = snd_una;
786 dst_confirm(csk->dst);
787 }
788 }
789
790 if (skb_queue_len(&csk->write_queue)) {
791 if (csk->cdev->csk_push_tx_frames(csk, 0))
792 cxgbi_conn_tx_open(csk);
793 } else
794 cxgbi_conn_tx_open(csk);
795 done:
796 spin_unlock_bh(&csk->lock);
797 }
798 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
799
800 static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
801 unsigned short mtu)
802 {
803 int i = 0;
804
805 while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
806 ++i;
807
808 return i;
809 }
810
811 unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
812 {
813 unsigned int idx;
814 struct dst_entry *dst = csk->dst;
815
816 csk->advmss = dst_metric_advmss(dst);
817
818 if (csk->advmss > pmtu - 40)
819 csk->advmss = pmtu - 40;
820 if (csk->advmss < csk->cdev->mtus[0] - 40)
821 csk->advmss = csk->cdev->mtus[0] - 40;
822 idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
823
824 return idx;
825 }
826 EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
827
828 void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
829 {
830 cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
831 __skb_queue_tail(&csk->write_queue, skb);
832 }
833 EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
834
835 void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
836 {
837 struct sk_buff *skb;
838
839 while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
840 kfree_skb(skb);
841 }
842 EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
843
844 void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
845 {
846 int pending = cxgbi_sock_count_pending_wrs(csk);
847
848 if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
849 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
850 csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
851 }
852 EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
853
854 static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
855 {
856 struct cxgbi_device *cdev = csk->cdev;
857 struct sk_buff *next;
858 int err, copied = 0;
859
860 spin_lock_bh(&csk->lock);
861
862 if (csk->state != CTP_ESTABLISHED) {
863 log_debug(1 << CXGBI_DBG_PDU_TX,
864 "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
865 csk, csk->state, csk->flags, csk->tid);
866 err = -EAGAIN;
867 goto out_err;
868 }
869
870 if (csk->err) {
871 log_debug(1 << CXGBI_DBG_PDU_TX,
872 "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
873 csk, csk->state, csk->flags, csk->tid, csk->err);
874 err = -EPIPE;
875 goto out_err;
876 }
877
878 if (csk->write_seq - csk->snd_una >= cdev->snd_win) {
879 log_debug(1 << CXGBI_DBG_PDU_TX,
880 "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
881 csk, csk->state, csk->flags, csk->tid, csk->write_seq,
882 csk->snd_una, cdev->snd_win);
883 err = -ENOBUFS;
884 goto out_err;
885 }
886
887 while (skb) {
888 int frags = skb_shinfo(skb)->nr_frags +
889 (skb->len != skb->data_len);
890
891 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
892 pr_err("csk 0x%p, skb head %u < %u.\n",
893 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
894 err = -EINVAL;
895 goto out_err;
896 }
897
898 if (frags >= SKB_WR_LIST_SIZE) {
899 pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
900 csk, skb_shinfo(skb)->nr_frags, skb->len,
901 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
902 err = -EINVAL;
903 goto out_err;
904 }
905
906 next = skb->next;
907 skb->next = NULL;
908 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
909 cxgbi_sock_skb_entail(csk, skb);
910 copied += skb->len;
911 csk->write_seq += skb->len +
912 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
913 skb = next;
914 }
915 done:
916 if (likely(skb_queue_len(&csk->write_queue)))
917 cdev->csk_push_tx_frames(csk, 1);
918 spin_unlock_bh(&csk->lock);
919 return copied;
920
921 out_err:
922 if (copied == 0 && err == -EPIPE)
923 copied = csk->err ? csk->err : -EPIPE;
924 else
925 copied = err;
926 goto done;
927 }
928
929 /*
930 * Direct Data Placement -
931 * Directly place the iSCSI Data-In or Data-Out PDU's payload into pre-posted
932 * final destination host-memory buffers based on the Initiator Task Tag (ITT)
933 * in Data-In or Target Task Tag (TTT) in Data-Out PDUs.
934 * The host memory address is programmed into h/w in the format of pagepod
935 * entries.
936 * The location of the pagepod entry is encoded into ddp tag which is used as
937 * the base for ITT/TTT.
938 */
939
940 static unsigned char ddp_page_order[DDP_PGIDX_MAX] = {0, 1, 2, 4};
941 static unsigned char ddp_page_shift[DDP_PGIDX_MAX] = {12, 13, 14, 16};
942 static unsigned char page_idx = DDP_PGIDX_MAX;
943
944 static unsigned char sw_tag_idx_bits;
945 static unsigned char sw_tag_age_bits;
946
947 /*
948 * Direct-Data Placement page size adjustment
949 */
950 static int ddp_adjust_page_table(void)
951 {
952 int i;
953 unsigned int base_order, order;
954
955 if (PAGE_SIZE < (1UL << ddp_page_shift[0])) {
956 pr_info("PAGE_SIZE 0x%lx too small, min 0x%lx\n",
957 PAGE_SIZE, 1UL << ddp_page_shift[0]);
958 return -EINVAL;
959 }
960
961 base_order = get_order(1UL << ddp_page_shift[0]);
962 order = get_order(1UL << PAGE_SHIFT);
963
964 for (i = 0; i < DDP_PGIDX_MAX; i++) {
965 /* first is the kernel page size, then just doubling */
966 ddp_page_order[i] = order - base_order + i;
967 ddp_page_shift[i] = PAGE_SHIFT + i;
968 }
969 return 0;
970 }
971
972 static int ddp_find_page_index(unsigned long pgsz)
973 {
974 int i;
975
976 for (i = 0; i < DDP_PGIDX_MAX; i++) {
977 if (pgsz == (1UL << ddp_page_shift[i]))
978 return i;
979 }
980 pr_info("ddp page size %lu not supported.\n", pgsz);
981 return DDP_PGIDX_MAX;
982 }
983
984 static void ddp_setup_host_page_size(void)
985 {
986 if (page_idx == DDP_PGIDX_MAX) {
987 page_idx = ddp_find_page_index(PAGE_SIZE);
988
989 if (page_idx == DDP_PGIDX_MAX) {
990 pr_info("system PAGE %lu, update hw.\n", PAGE_SIZE);
991 if (ddp_adjust_page_table() < 0) {
992 pr_info("PAGE %lu, disable ddp.\n", PAGE_SIZE);
993 return;
994 }
995 page_idx = ddp_find_page_index(PAGE_SIZE);
996 }
997 pr_info("system PAGE %lu, ddp idx %u.\n", PAGE_SIZE, page_idx);
998 }
999 }
1000
1001 void cxgbi_ddp_page_size_factor(int *pgsz_factor)
1002 {
1003 int i;
1004
1005 for (i = 0; i < DDP_PGIDX_MAX; i++)
1006 pgsz_factor[i] = ddp_page_order[i];
1007 }
1008 EXPORT_SYMBOL_GPL(cxgbi_ddp_page_size_factor);
1009
1010 /*
1011 * DDP setup & teardown
1012 */
1013
1014 void cxgbi_ddp_ppod_set(struct cxgbi_pagepod *ppod,
1015 struct cxgbi_pagepod_hdr *hdr,
1016 struct cxgbi_gather_list *gl, unsigned int gidx)
1017 {
1018 int i;
1019
1020 memcpy(ppod, hdr, sizeof(*hdr));
1021 for (i = 0; i < (PPOD_PAGES_MAX + 1); i++, gidx++) {
1022 ppod->addr[i] = gidx < gl->nelem ?
1023 cpu_to_be64(gl->phys_addr[gidx]) : 0ULL;
1024 }
1025 }
1026 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_set);
1027
1028 void cxgbi_ddp_ppod_clear(struct cxgbi_pagepod *ppod)
1029 {
1030 memset(ppod, 0, sizeof(*ppod));
1031 }
1032 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_clear);
1033
1034 static inline int ddp_find_unused_entries(struct cxgbi_ddp_info *ddp,
1035 unsigned int start, unsigned int max,
1036 unsigned int count,
1037 struct cxgbi_gather_list *gl)
1038 {
1039 unsigned int i, j, k;
1040
1041 /* not enough entries */
1042 if ((max - start) < count) {
1043 log_debug(1 << CXGBI_DBG_DDP,
1044 "NOT enough entries %u+%u < %u.\n", start, count, max);
1045 return -EBUSY;
1046 }
1047
1048 max -= count;
1049 spin_lock(&ddp->map_lock);
1050 for (i = start; i < max;) {
1051 for (j = 0, k = i; j < count; j++, k++) {
1052 if (ddp->gl_map[k])
1053 break;
1054 }
1055 if (j == count) {
1056 for (j = 0, k = i; j < count; j++, k++)
1057 ddp->gl_map[k] = gl;
1058 spin_unlock(&ddp->map_lock);
1059 return i;
1060 }
1061 i += j + 1;
1062 }
1063 spin_unlock(&ddp->map_lock);
1064 log_debug(1 << CXGBI_DBG_DDP,
1065 "NO suitable entries %u available.\n", count);
1066 return -EBUSY;
1067 }
1068
1069 static inline void ddp_unmark_entries(struct cxgbi_ddp_info *ddp,
1070 int start, int count)
1071 {
1072 spin_lock(&ddp->map_lock);
1073 memset(&ddp->gl_map[start], 0,
1074 count * sizeof(struct cxgbi_gather_list *));
1075 spin_unlock(&ddp->map_lock);
1076 }
1077
1078 static inline void ddp_gl_unmap(struct pci_dev *pdev,
1079 struct cxgbi_gather_list *gl)
1080 {
1081 int i;
1082
1083 for (i = 0; i < gl->nelem; i++)
1084 dma_unmap_page(&pdev->dev, gl->phys_addr[i], PAGE_SIZE,
1085 PCI_DMA_FROMDEVICE);
1086 }
1087
1088 static inline int ddp_gl_map(struct pci_dev *pdev,
1089 struct cxgbi_gather_list *gl)
1090 {
1091 int i;
1092
1093 for (i = 0; i < gl->nelem; i++) {
1094 gl->phys_addr[i] = dma_map_page(&pdev->dev, gl->pages[i], 0,
1095 PAGE_SIZE,
1096 PCI_DMA_FROMDEVICE);
1097 if (unlikely(dma_mapping_error(&pdev->dev, gl->phys_addr[i]))) {
1098 log_debug(1 << CXGBI_DBG_DDP,
1099 "page %d 0x%p, 0x%p dma mapping err.\n",
1100 i, gl->pages[i], pdev);
1101 goto unmap;
1102 }
1103 }
1104 return i;
1105 unmap:
1106 if (i) {
1107 unsigned int nelem = gl->nelem;
1108
1109 gl->nelem = i;
1110 ddp_gl_unmap(pdev, gl);
1111 gl->nelem = nelem;
1112 }
1113 return -EINVAL;
1114 }
1115
1116 static void ddp_release_gl(struct cxgbi_gather_list *gl,
1117 struct pci_dev *pdev)
1118 {
1119 ddp_gl_unmap(pdev, gl);
1120 kfree(gl);
1121 }
1122
1123 static struct cxgbi_gather_list *ddp_make_gl(unsigned int xferlen,
1124 struct scatterlist *sgl,
1125 unsigned int sgcnt,
1126 struct pci_dev *pdev,
1127 gfp_t gfp)
1128 {
1129 struct cxgbi_gather_list *gl;
1130 struct scatterlist *sg = sgl;
1131 struct page *sgpage = sg_page(sg);
1132 unsigned int sglen = sg->length;
1133 unsigned int sgoffset = sg->offset;
1134 unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >>
1135 PAGE_SHIFT;
1136 int i = 1, j = 0;
1137
1138 if (xferlen < DDP_THRESHOLD) {
1139 log_debug(1 << CXGBI_DBG_DDP,
1140 "xfer %u < threshold %u, no ddp.\n",
1141 xferlen, DDP_THRESHOLD);
1142 return NULL;
1143 }
1144
1145 gl = kzalloc(sizeof(struct cxgbi_gather_list) +
1146 npages * (sizeof(dma_addr_t) +
1147 sizeof(struct page *)), gfp);
1148 if (!gl) {
1149 log_debug(1 << CXGBI_DBG_DDP,
1150 "xfer %u, %u pages, OOM.\n", xferlen, npages);
1151 return NULL;
1152 }
1153
1154 log_debug(1 << CXGBI_DBG_DDP,
1155 "xfer %u, sgl %u, gl max %u.\n", xferlen, sgcnt, npages);
1156
1157 gl->pages = (struct page **)&gl->phys_addr[npages];
1158 gl->nelem = npages;
1159 gl->length = xferlen;
1160 gl->offset = sgoffset;
1161 gl->pages[0] = sgpage;
1162
1163 for (i = 1, sg = sg_next(sgl), j = 0; i < sgcnt;
1164 i++, sg = sg_next(sg)) {
1165 struct page *page = sg_page(sg);
1166
1167 if (sgpage == page && sg->offset == sgoffset + sglen)
1168 sglen += sg->length;
1169 else {
1170 /* make sure the sgl is fit for ddp:
1171 * each has the same page size, and
1172 * all of the middle pages are used completely
1173 */
1174 if ((j && sgoffset) || ((i != sgcnt - 1) &&
1175 ((sglen + sgoffset) & ~PAGE_MASK))) {
1176 log_debug(1 << CXGBI_DBG_DDP,
1177 "page %d/%u, %u + %u.\n",
1178 i, sgcnt, sgoffset, sglen);
1179 goto error_out;
1180 }
1181
1182 j++;
1183 if (j == gl->nelem || sg->offset) {
1184 log_debug(1 << CXGBI_DBG_DDP,
1185 "page %d/%u, offset %u.\n",
1186 j, gl->nelem, sg->offset);
1187 goto error_out;
1188 }
1189 gl->pages[j] = page;
1190 sglen = sg->length;
1191 sgoffset = sg->offset;
1192 sgpage = page;
1193 }
1194 }
1195 gl->nelem = ++j;
1196
1197 if (ddp_gl_map(pdev, gl) < 0)
1198 goto error_out;
1199
1200 return gl;
1201
1202 error_out:
1203 kfree(gl);
1204 return NULL;
1205 }
1206
1207 static void ddp_tag_release(struct cxgbi_hba *chba, u32 tag)
1208 {
1209 struct cxgbi_device *cdev = chba->cdev;
1210 struct cxgbi_ddp_info *ddp = cdev->ddp;
1211 u32 idx;
1212
1213 idx = (tag >> PPOD_IDX_SHIFT) & ddp->idx_mask;
1214 if (idx < ddp->nppods) {
1215 struct cxgbi_gather_list *gl = ddp->gl_map[idx];
1216 unsigned int npods;
1217
1218 if (!gl || !gl->nelem) {
1219 pr_warn("tag 0x%x, idx %u, gl 0x%p, %u.\n",
1220 tag, idx, gl, gl ? gl->nelem : 0);
1221 return;
1222 }
1223 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1224 log_debug(1 << CXGBI_DBG_DDP,
1225 "tag 0x%x, release idx %u, npods %u.\n",
1226 tag, idx, npods);
1227 cdev->csk_ddp_clear(chba, tag, idx, npods);
1228 ddp_unmark_entries(ddp, idx, npods);
1229 ddp_release_gl(gl, ddp->pdev);
1230 } else
1231 pr_warn("tag 0x%x, idx %u > max %u.\n", tag, idx, ddp->nppods);
1232 }
1233
1234 static int ddp_tag_reserve(struct cxgbi_sock *csk, unsigned int tid,
1235 u32 sw_tag, u32 *tagp, struct cxgbi_gather_list *gl,
1236 gfp_t gfp)
1237 {
1238 struct cxgbi_device *cdev = csk->cdev;
1239 struct cxgbi_ddp_info *ddp = cdev->ddp;
1240 struct cxgbi_tag_format *tformat = &cdev->tag_format;
1241 struct cxgbi_pagepod_hdr hdr;
1242 unsigned int npods;
1243 int idx = -1;
1244 int err = -ENOMEM;
1245 u32 tag;
1246
1247 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1248 if (ddp->idx_last == ddp->nppods)
1249 idx = ddp_find_unused_entries(ddp, 0, ddp->nppods,
1250 npods, gl);
1251 else {
1252 idx = ddp_find_unused_entries(ddp, ddp->idx_last + 1,
1253 ddp->nppods, npods,
1254 gl);
1255 if (idx < 0 && ddp->idx_last >= npods) {
1256 idx = ddp_find_unused_entries(ddp, 0,
1257 min(ddp->idx_last + npods, ddp->nppods),
1258 npods, gl);
1259 }
1260 }
1261 if (idx < 0) {
1262 log_debug(1 << CXGBI_DBG_DDP,
1263 "xferlen %u, gl %u, npods %u NO DDP.\n",
1264 gl->length, gl->nelem, npods);
1265 return idx;
1266 }
1267
1268 tag = cxgbi_ddp_tag_base(tformat, sw_tag);
1269 tag |= idx << PPOD_IDX_SHIFT;
1270
1271 hdr.rsvd = 0;
1272 hdr.vld_tid = htonl(PPOD_VALID_FLAG | PPOD_TID(tid));
1273 hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask);
1274 hdr.max_offset = htonl(gl->length);
1275 hdr.page_offset = htonl(gl->offset);
1276
1277 err = cdev->csk_ddp_set(csk, &hdr, idx, npods, gl);
1278 if (err < 0)
1279 goto unmark_entries;
1280
1281 ddp->idx_last = idx;
1282 log_debug(1 << CXGBI_DBG_DDP,
1283 "xfer %u, gl %u,%u, tid 0x%x, tag 0x%x->0x%x(%u,%u).\n",
1284 gl->length, gl->nelem, gl->offset, tid, sw_tag, tag, idx,
1285 npods);
1286 *tagp = tag;
1287 return 0;
1288
1289 unmark_entries:
1290 ddp_unmark_entries(ddp, idx, npods);
1291 return err;
1292 }
1293
1294 int cxgbi_ddp_reserve(struct cxgbi_sock *csk, unsigned int *tagp,
1295 unsigned int sw_tag, unsigned int xferlen,
1296 struct scatterlist *sgl, unsigned int sgcnt, gfp_t gfp)
1297 {
1298 struct cxgbi_device *cdev = csk->cdev;
1299 struct cxgbi_tag_format *tformat = &cdev->tag_format;
1300 struct cxgbi_gather_list *gl;
1301 int err;
1302
1303 if (page_idx >= DDP_PGIDX_MAX || !cdev->ddp ||
1304 xferlen < DDP_THRESHOLD) {
1305 log_debug(1 << CXGBI_DBG_DDP,
1306 "pgidx %u, xfer %u, NO ddp.\n", page_idx, xferlen);
1307 return -EINVAL;
1308 }
1309
1310 if (!cxgbi_sw_tag_usable(tformat, sw_tag)) {
1311 log_debug(1 << CXGBI_DBG_DDP,
1312 "sw_tag 0x%x NOT usable.\n", sw_tag);
1313 return -EINVAL;
1314 }
1315
1316 gl = ddp_make_gl(xferlen, sgl, sgcnt, cdev->pdev, gfp);
1317 if (!gl)
1318 return -ENOMEM;
1319
1320 err = ddp_tag_reserve(csk, csk->tid, sw_tag, tagp, gl, gfp);
1321 if (err < 0)
1322 ddp_release_gl(gl, cdev->pdev);
1323
1324 return err;
1325 }
1326
1327 static void ddp_destroy(struct kref *kref)
1328 {
1329 struct cxgbi_ddp_info *ddp = container_of(kref,
1330 struct cxgbi_ddp_info,
1331 refcnt);
1332 struct cxgbi_device *cdev = ddp->cdev;
1333 int i = 0;
1334
1335 pr_info("kref 0, destroy ddp 0x%p, cdev 0x%p.\n", ddp, cdev);
1336
1337 while (i < ddp->nppods) {
1338 struct cxgbi_gather_list *gl = ddp->gl_map[i];
1339
1340 if (gl) {
1341 int npods = (gl->nelem + PPOD_PAGES_MAX - 1)
1342 >> PPOD_PAGES_SHIFT;
1343 pr_info("cdev 0x%p, ddp %d + %d.\n", cdev, i, npods);
1344 kfree(gl);
1345 i += npods;
1346 } else
1347 i++;
1348 }
1349 cxgbi_free_big_mem(ddp);
1350 }
1351
1352 int cxgbi_ddp_cleanup(struct cxgbi_device *cdev)
1353 {
1354 struct cxgbi_ddp_info *ddp = cdev->ddp;
1355
1356 log_debug(1 << CXGBI_DBG_DDP,
1357 "cdev 0x%p, release ddp 0x%p.\n", cdev, ddp);
1358 cdev->ddp = NULL;
1359 if (ddp)
1360 return kref_put(&ddp->refcnt, ddp_destroy);
1361 return 0;
1362 }
1363 EXPORT_SYMBOL_GPL(cxgbi_ddp_cleanup);
1364
1365 int cxgbi_ddp_init(struct cxgbi_device *cdev,
1366 unsigned int llimit, unsigned int ulimit,
1367 unsigned int max_txsz, unsigned int max_rxsz)
1368 {
1369 struct cxgbi_ddp_info *ddp;
1370 unsigned int ppmax, bits;
1371
1372 ppmax = (ulimit - llimit + 1) >> PPOD_SIZE_SHIFT;
1373 bits = __ilog2_u32(ppmax) + 1;
1374 if (bits > PPOD_IDX_MAX_SIZE)
1375 bits = PPOD_IDX_MAX_SIZE;
1376 ppmax = (1 << (bits - 1)) - 1;
1377
1378 ddp = cxgbi_alloc_big_mem(sizeof(struct cxgbi_ddp_info) +
1379 ppmax * (sizeof(struct cxgbi_gather_list *) +
1380 sizeof(struct sk_buff *)),
1381 GFP_KERNEL);
1382 if (!ddp) {
1383 pr_warn("cdev 0x%p, ddp ppmax %u OOM.\n", cdev, ppmax);
1384 return -ENOMEM;
1385 }
1386 ddp->gl_map = (struct cxgbi_gather_list **)(ddp + 1);
1387 cdev->ddp = ddp;
1388
1389 spin_lock_init(&ddp->map_lock);
1390 kref_init(&ddp->refcnt);
1391
1392 ddp->cdev = cdev;
1393 ddp->pdev = cdev->pdev;
1394 ddp->llimit = llimit;
1395 ddp->ulimit = ulimit;
1396 ddp->max_txsz = min_t(unsigned int, max_txsz, ULP2_MAX_PKT_SIZE);
1397 ddp->max_rxsz = min_t(unsigned int, max_rxsz, ULP2_MAX_PKT_SIZE);
1398 ddp->nppods = ppmax;
1399 ddp->idx_last = ppmax;
1400 ddp->idx_bits = bits;
1401 ddp->idx_mask = (1 << bits) - 1;
1402 ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1;
1403
1404 cdev->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
1405 cdev->tag_format.rsvd_bits = ddp->idx_bits;
1406 cdev->tag_format.rsvd_shift = PPOD_IDX_SHIFT;
1407 cdev->tag_format.rsvd_mask = (1 << cdev->tag_format.rsvd_bits) - 1;
1408
1409 pr_info("%s tag format, sw %u, rsvd %u,%u, mask 0x%x.\n",
1410 cdev->ports[0]->name, cdev->tag_format.sw_bits,
1411 cdev->tag_format.rsvd_bits, cdev->tag_format.rsvd_shift,
1412 cdev->tag_format.rsvd_mask);
1413
1414 cdev->tx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1415 ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
1416 cdev->rx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1417 ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);
1418
1419 log_debug(1 << CXGBI_DBG_DDP,
1420 "%s max payload size: %u/%u, %u/%u.\n",
1421 cdev->ports[0]->name, cdev->tx_max_size, ddp->max_txsz,
1422 cdev->rx_max_size, ddp->max_rxsz);
1423 return 0;
1424 }
1425 EXPORT_SYMBOL_GPL(cxgbi_ddp_init);
1426
1427 /*
1428 * APIs interacting with open-iscsi libraries
1429 */
1430
1431 static unsigned char padding[4];
1432
1433 static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1434 {
1435 struct scsi_cmnd *sc = task->sc;
1436 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1437 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1438 struct cxgbi_hba *chba = cconn->chba;
1439 struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1440 u32 tag = ntohl((__force u32)hdr_itt);
1441
1442 log_debug(1 << CXGBI_DBG_DDP,
1443 "cdev 0x%p, release tag 0x%x.\n", chba->cdev, tag);
1444 if (sc &&
1445 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
1446 cxgbi_is_ddp_tag(tformat, tag))
1447 ddp_tag_release(chba, tag);
1448 }
1449
1450 static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1451 {
1452 struct scsi_cmnd *sc = task->sc;
1453 struct iscsi_conn *conn = task->conn;
1454 struct iscsi_session *sess = conn->session;
1455 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1456 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1457 struct cxgbi_hba *chba = cconn->chba;
1458 struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1459 u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
1460 u32 tag = 0;
1461 int err = -EINVAL;
1462
1463 if (sc &&
1464 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)) {
1465 err = cxgbi_ddp_reserve(cconn->cep->csk, &tag, sw_tag,
1466 scsi_in(sc)->length,
1467 scsi_in(sc)->table.sgl,
1468 scsi_in(sc)->table.nents,
1469 GFP_ATOMIC);
1470 if (err < 0)
1471 log_debug(1 << CXGBI_DBG_DDP,
1472 "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1473 cconn->cep->csk, task, scsi_in(sc)->length,
1474 scsi_in(sc)->table.nents);
1475 }
1476
1477 if (err < 0)
1478 tag = cxgbi_set_non_ddp_tag(tformat, sw_tag);
1479 /* the itt need to sent in big-endian order */
1480 *hdr_itt = (__force itt_t)htonl(tag);
1481
1482 log_debug(1 << CXGBI_DBG_DDP,
1483 "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1484 chba->cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1485 return 0;
1486 }
1487
1488 void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1489 {
1490 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1491 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1492 struct cxgbi_device *cdev = cconn->chba->cdev;
1493 u32 tag = ntohl((__force u32) itt);
1494 u32 sw_bits;
1495
1496 sw_bits = cxgbi_tag_nonrsvd_bits(&cdev->tag_format, tag);
1497 if (idx)
1498 *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
1499 if (age)
1500 *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
1501
1502 log_debug(1 << CXGBI_DBG_DDP,
1503 "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1504 cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1505 age ? *age : 0xFF);
1506 }
1507 EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1508
1509 void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1510 {
1511 struct iscsi_conn *conn = csk->user_data;
1512
1513 if (conn) {
1514 log_debug(1 << CXGBI_DBG_SOCK,
1515 "csk 0x%p, cid %d.\n", csk, conn->id);
1516 iscsi_conn_queue_work(conn);
1517 }
1518 }
1519 EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1520
1521 /*
1522 * pdu receive, interact with libiscsi_tcp
1523 */
1524 static inline int read_pdu_skb(struct iscsi_conn *conn,
1525 struct sk_buff *skb,
1526 unsigned int offset,
1527 int offloaded)
1528 {
1529 int status = 0;
1530 int bytes_read;
1531
1532 bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1533 switch (status) {
1534 case ISCSI_TCP_CONN_ERR:
1535 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1536 skb, offset, offloaded);
1537 return -EIO;
1538 case ISCSI_TCP_SUSPENDED:
1539 log_debug(1 << CXGBI_DBG_PDU_RX,
1540 "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1541 skb, offset, offloaded, bytes_read);
1542 /* no transfer - just have caller flush queue */
1543 return bytes_read;
1544 case ISCSI_TCP_SKB_DONE:
1545 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1546 skb, offset, offloaded);
1547 /*
1548 * pdus should always fit in the skb and we should get
1549 * segment done notifcation.
1550 */
1551 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1552 return -EFAULT;
1553 case ISCSI_TCP_SEGMENT_DONE:
1554 log_debug(1 << CXGBI_DBG_PDU_RX,
1555 "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1556 skb, offset, offloaded, bytes_read);
1557 return bytes_read;
1558 default:
1559 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1560 skb, offset, offloaded, status);
1561 return -EINVAL;
1562 }
1563 }
1564
1565 static int skb_read_pdu_bhs(struct iscsi_conn *conn, struct sk_buff *skb)
1566 {
1567 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1568
1569 log_debug(1 << CXGBI_DBG_PDU_RX,
1570 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1571 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1572
1573 if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1574 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1575 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1576 return -EIO;
1577 }
1578
1579 if (conn->hdrdgst_en &&
1580 cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1581 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1582 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1583 return -EIO;
1584 }
1585
1586 return read_pdu_skb(conn, skb, 0, 0);
1587 }
1588
1589 static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1590 struct sk_buff *skb, unsigned int offset)
1591 {
1592 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1593 bool offloaded = 0;
1594 int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1595
1596 log_debug(1 << CXGBI_DBG_PDU_RX,
1597 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1598 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1599
1600 if (conn->datadgst_en &&
1601 cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1602 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1603 conn, lskb, cxgbi_skcb_flags(lskb));
1604 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1605 return -EIO;
1606 }
1607
1608 if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1609 return 0;
1610
1611 /* coalesced, add header digest length */
1612 if (lskb == skb && conn->hdrdgst_en)
1613 offset += ISCSI_DIGEST_SIZE;
1614
1615 if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1616 offloaded = 1;
1617
1618 if (opcode == ISCSI_OP_SCSI_DATA_IN)
1619 log_debug(1 << CXGBI_DBG_PDU_RX,
1620 "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1621 skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1622 tcp_conn->in.datalen, offloaded ? "is" : "not");
1623
1624 return read_pdu_skb(conn, skb, offset, offloaded);
1625 }
1626
1627 static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1628 {
1629 struct cxgbi_device *cdev = csk->cdev;
1630 int must_send;
1631 u32 credits;
1632
1633 log_debug(1 << CXGBI_DBG_PDU_RX,
1634 "csk 0x%p,%u,0x%lu,%u, seq %u, wup %u, thre %u, %u.\n",
1635 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1636 csk->rcv_wup, cdev->rx_credit_thres,
1637 cdev->rcv_win);
1638
1639 if (csk->state != CTP_ESTABLISHED)
1640 return;
1641
1642 credits = csk->copied_seq - csk->rcv_wup;
1643 if (unlikely(!credits))
1644 return;
1645 if (unlikely(cdev->rx_credit_thres == 0))
1646 return;
1647
1648 must_send = credits + 16384 >= cdev->rcv_win;
1649 if (must_send || credits >= cdev->rx_credit_thres)
1650 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1651 }
1652
1653 void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1654 {
1655 struct cxgbi_device *cdev = csk->cdev;
1656 struct iscsi_conn *conn = csk->user_data;
1657 struct sk_buff *skb;
1658 unsigned int read = 0;
1659 int err = 0;
1660
1661 log_debug(1 << CXGBI_DBG_PDU_RX,
1662 "csk 0x%p, conn 0x%p.\n", csk, conn);
1663
1664 if (unlikely(!conn || conn->suspend_rx)) {
1665 log_debug(1 << CXGBI_DBG_PDU_RX,
1666 "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1667 csk, conn, conn ? conn->id : 0xFF,
1668 conn ? conn->suspend_rx : 0xFF);
1669 return;
1670 }
1671
1672 while (!err) {
1673 skb = skb_peek(&csk->receive_queue);
1674 if (!skb ||
1675 !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1676 if (skb)
1677 log_debug(1 << CXGBI_DBG_PDU_RX,
1678 "skb 0x%p, NOT ready 0x%lx.\n",
1679 skb, cxgbi_skcb_flags(skb));
1680 break;
1681 }
1682 __skb_unlink(skb, &csk->receive_queue);
1683
1684 read += cxgbi_skcb_rx_pdulen(skb);
1685 log_debug(1 << CXGBI_DBG_PDU_RX,
1686 "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1687 csk, skb, skb->len, cxgbi_skcb_flags(skb),
1688 cxgbi_skcb_rx_pdulen(skb));
1689
1690 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1691 err = skb_read_pdu_bhs(conn, skb);
1692 if (err < 0) {
1693 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1694 "f 0x%lx, plen %u.\n",
1695 csk, skb, skb->len,
1696 cxgbi_skcb_flags(skb),
1697 cxgbi_skcb_rx_pdulen(skb));
1698 goto skb_done;
1699 }
1700 err = skb_read_pdu_data(conn, skb, skb,
1701 err + cdev->skb_rx_extra);
1702 if (err < 0)
1703 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1704 "f 0x%lx, plen %u.\n",
1705 csk, skb, skb->len,
1706 cxgbi_skcb_flags(skb),
1707 cxgbi_skcb_rx_pdulen(skb));
1708 } else {
1709 err = skb_read_pdu_bhs(conn, skb);
1710 if (err < 0) {
1711 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1712 "f 0x%lx, plen %u.\n",
1713 csk, skb, skb->len,
1714 cxgbi_skcb_flags(skb),
1715 cxgbi_skcb_rx_pdulen(skb));
1716 goto skb_done;
1717 }
1718
1719 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1720 struct sk_buff *dskb;
1721
1722 dskb = skb_peek(&csk->receive_queue);
1723 if (!dskb) {
1724 pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1725 " plen %u, NO data.\n",
1726 csk, skb, skb->len,
1727 cxgbi_skcb_flags(skb),
1728 cxgbi_skcb_rx_pdulen(skb));
1729 err = -EIO;
1730 goto skb_done;
1731 }
1732 __skb_unlink(dskb, &csk->receive_queue);
1733
1734 err = skb_read_pdu_data(conn, skb, dskb, 0);
1735 if (err < 0)
1736 pr_err("data, csk 0x%p, skb 0x%p,%u, "
1737 "f 0x%lx, plen %u, dskb 0x%p,"
1738 "%u.\n",
1739 csk, skb, skb->len,
1740 cxgbi_skcb_flags(skb),
1741 cxgbi_skcb_rx_pdulen(skb),
1742 dskb, dskb->len);
1743 __kfree_skb(dskb);
1744 } else
1745 err = skb_read_pdu_data(conn, skb, skb, 0);
1746 }
1747 skb_done:
1748 __kfree_skb(skb);
1749
1750 if (err < 0)
1751 break;
1752 }
1753
1754 log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
1755 if (read) {
1756 csk->copied_seq += read;
1757 csk_return_rx_credits(csk, read);
1758 conn->rxdata_octets += read;
1759 }
1760
1761 if (err < 0) {
1762 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
1763 csk, conn, err, read);
1764 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1765 }
1766 }
1767 EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
1768
1769 static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
1770 unsigned int offset, unsigned int *off,
1771 struct scatterlist **sgp)
1772 {
1773 int i;
1774 struct scatterlist *sg;
1775
1776 for_each_sg(sgl, sg, sgcnt, i) {
1777 if (offset < sg->length) {
1778 *off = offset;
1779 *sgp = sg;
1780 return 0;
1781 }
1782 offset -= sg->length;
1783 }
1784 return -EFAULT;
1785 }
1786
1787 static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
1788 unsigned int dlen, skb_frag_t *frags,
1789 int frag_max)
1790 {
1791 unsigned int datalen = dlen;
1792 unsigned int sglen = sg->length - sgoffset;
1793 struct page *page = sg_page(sg);
1794 int i;
1795
1796 i = 0;
1797 do {
1798 unsigned int copy;
1799
1800 if (!sglen) {
1801 sg = sg_next(sg);
1802 if (!sg) {
1803 pr_warn("sg %d NULL, len %u/%u.\n",
1804 i, datalen, dlen);
1805 return -EINVAL;
1806 }
1807 sgoffset = 0;
1808 sglen = sg->length;
1809 page = sg_page(sg);
1810
1811 }
1812 copy = min(datalen, sglen);
1813 if (i && page == frags[i - 1].page &&
1814 sgoffset + sg->offset ==
1815 frags[i - 1].page_offset + frags[i - 1].size) {
1816 frags[i - 1].size += copy;
1817 } else {
1818 if (i >= frag_max) {
1819 pr_warn("too many pages %u, dlen %u.\n",
1820 frag_max, dlen);
1821 return -EINVAL;
1822 }
1823
1824 frags[i].page = page;
1825 frags[i].page_offset = sg->offset + sgoffset;
1826 frags[i].size = copy;
1827 i++;
1828 }
1829 datalen -= copy;
1830 sgoffset += copy;
1831 sglen -= copy;
1832 } while (datalen);
1833
1834 return i;
1835 }
1836
1837 int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
1838 {
1839 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1840 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1841 struct cxgbi_device *cdev = cconn->chba->cdev;
1842 struct iscsi_conn *conn = task->conn;
1843 struct iscsi_tcp_task *tcp_task = task->dd_data;
1844 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1845 struct scsi_cmnd *sc = task->sc;
1846 int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
1847
1848 tcp_task->dd_data = tdata;
1849 task->hdr = NULL;
1850
1851 if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
1852 (opcode == ISCSI_OP_SCSI_DATA_OUT ||
1853 (opcode == ISCSI_OP_SCSI_CMD &&
1854 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
1855 /* data could goes into skb head */
1856 headroom += min_t(unsigned int,
1857 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
1858 conn->max_xmit_dlength);
1859
1860 tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
1861 if (!tdata->skb) {
1862 pr_warn("alloc skb %u+%u, opcode 0x%x failed.\n",
1863 cdev->skb_tx_rsvd, headroom, opcode);
1864 return -ENOMEM;
1865 }
1866
1867 skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
1868 task->hdr = (struct iscsi_hdr *)tdata->skb->data;
1869 task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
1870
1871 /* data_out uses scsi_cmd's itt */
1872 if (opcode != ISCSI_OP_SCSI_DATA_OUT)
1873 task_reserve_itt(task, &task->hdr->itt);
1874
1875 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1876 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
1877 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
1878 conn->max_xmit_dlength, ntohl(task->hdr->itt));
1879
1880 return 0;
1881 }
1882 EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
1883
1884 static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
1885 {
1886 if (hcrc || dcrc) {
1887 u8 submode = 0;
1888
1889 if (hcrc)
1890 submode |= 1;
1891 if (dcrc)
1892 submode |= 2;
1893 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
1894 } else
1895 cxgbi_skcb_ulp_mode(skb) = 0;
1896 }
1897
1898 int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
1899 unsigned int count)
1900 {
1901 struct iscsi_conn *conn = task->conn;
1902 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1903 struct sk_buff *skb = tdata->skb;
1904 unsigned int datalen = count;
1905 int i, padlen = iscsi_padding(count);
1906 struct page *pg;
1907
1908 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1909 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
1910 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
1911 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
1912
1913 skb_put(skb, task->hdr_len);
1914 tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
1915 if (!count)
1916 return 0;
1917
1918 if (task->sc) {
1919 struct scsi_data_buffer *sdb = scsi_out(task->sc);
1920 struct scatterlist *sg = NULL;
1921 int err;
1922
1923 tdata->offset = offset;
1924 tdata->count = count;
1925 err = sgl_seek_offset(
1926 sdb->table.sgl, sdb->table.nents,
1927 tdata->offset, &tdata->sgoffset, &sg);
1928 if (err < 0) {
1929 pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
1930 sdb->table.nents, tdata->offset, sdb->length);
1931 return err;
1932 }
1933 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
1934 tdata->frags, MAX_PDU_FRAGS);
1935 if (err < 0) {
1936 pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
1937 sdb->table.nents, tdata->offset, tdata->count);
1938 return err;
1939 }
1940 tdata->nr_frags = err;
1941
1942 if (tdata->nr_frags > MAX_SKB_FRAGS ||
1943 (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
1944 char *dst = skb->data + task->hdr_len;
1945 skb_frag_t *frag = tdata->frags;
1946
1947 /* data fits in the skb's headroom */
1948 for (i = 0; i < tdata->nr_frags; i++, frag++) {
1949 char *src = kmap_atomic(frag->page,
1950 KM_SOFTIRQ0);
1951
1952 memcpy(dst, src+frag->page_offset, frag->size);
1953 dst += frag->size;
1954 kunmap_atomic(src, KM_SOFTIRQ0);
1955 }
1956 if (padlen) {
1957 memset(dst, 0, padlen);
1958 padlen = 0;
1959 }
1960 skb_put(skb, count + padlen);
1961 } else {
1962 /* data fit into frag_list */
1963 for (i = 0; i < tdata->nr_frags; i++)
1964 get_page(tdata->frags[i].page);
1965
1966 memcpy(skb_shinfo(skb)->frags, tdata->frags,
1967 sizeof(skb_frag_t) * tdata->nr_frags);
1968 skb_shinfo(skb)->nr_frags = tdata->nr_frags;
1969 skb->len += count;
1970 skb->data_len += count;
1971 skb->truesize += count;
1972 }
1973
1974 } else {
1975 pg = virt_to_page(task->data);
1976
1977 get_page(pg);
1978 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
1979 count);
1980 skb->len += count;
1981 skb->data_len += count;
1982 skb->truesize += count;
1983 }
1984
1985 if (padlen) {
1986 i = skb_shinfo(skb)->nr_frags;
1987 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
1988 virt_to_page(padding), offset_in_page(padding),
1989 padlen);
1990
1991 skb->data_len += padlen;
1992 skb->truesize += padlen;
1993 skb->len += padlen;
1994 }
1995
1996 return 0;
1997 }
1998 EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
1999
2000 int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2001 {
2002 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2003 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2004 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2005 struct sk_buff *skb = tdata->skb;
2006 unsigned int datalen;
2007 int err;
2008
2009 if (!skb) {
2010 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2011 "task 0x%p, skb NULL.\n", task);
2012 return 0;
2013 }
2014
2015 datalen = skb->data_len;
2016 tdata->skb = NULL;
2017 err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2018 if (err > 0) {
2019 int pdulen = err;
2020
2021 log_debug(1 << CXGBI_DBG_PDU_TX,
2022 "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2023 task, task->sc, skb, skb->len, skb->data_len, err);
2024
2025 if (task->conn->hdrdgst_en)
2026 pdulen += ISCSI_DIGEST_SIZE;
2027
2028 if (datalen && task->conn->datadgst_en)
2029 pdulen += ISCSI_DIGEST_SIZE;
2030
2031 task->conn->txdata_octets += pdulen;
2032 return 0;
2033 }
2034
2035 if (err == -EAGAIN || err == -ENOBUFS) {
2036 log_debug(1 << CXGBI_DBG_PDU_TX,
2037 "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2038 task, skb, skb->len, skb->data_len, err);
2039 /* reset skb to send when we are called again */
2040 tdata->skb = skb;
2041 return err;
2042 }
2043
2044 kfree_skb(skb);
2045 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2046 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2047 task->itt, skb, skb->len, skb->data_len, err);
2048 iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2049 iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2050 return err;
2051 }
2052 EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2053
2054 void cxgbi_cleanup_task(struct iscsi_task *task)
2055 {
2056 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2057
2058 log_debug(1 << CXGBI_DBG_ISCSI,
2059 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2060 task, tdata->skb, task->hdr_itt);
2061
2062 /* never reached the xmit task callout */
2063 if (tdata->skb)
2064 __kfree_skb(tdata->skb);
2065 memset(tdata, 0, sizeof(*tdata));
2066
2067 task_release_itt(task, task->hdr_itt);
2068 iscsi_tcp_cleanup_task(task);
2069 }
2070 EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2071
2072 void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2073 struct iscsi_stats *stats)
2074 {
2075 struct iscsi_conn *conn = cls_conn->dd_data;
2076
2077 stats->txdata_octets = conn->txdata_octets;
2078 stats->rxdata_octets = conn->rxdata_octets;
2079 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2080 stats->dataout_pdus = conn->dataout_pdus_cnt;
2081 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2082 stats->datain_pdus = conn->datain_pdus_cnt;
2083 stats->r2t_pdus = conn->r2t_pdus_cnt;
2084 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2085 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2086 stats->digest_err = 0;
2087 stats->timeout_err = 0;
2088 stats->custom_length = 1;
2089 strcpy(stats->custom[0].desc, "eh_abort_cnt");
2090 stats->custom[0].value = conn->eh_abort_cnt;
2091 }
2092 EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2093
2094 static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2095 {
2096 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2097 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2098 struct cxgbi_device *cdev = cconn->chba->cdev;
2099 unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2100 unsigned int max_def = 512 * MAX_SKB_FRAGS;
2101 unsigned int max = max(max_def, headroom);
2102
2103 max = min(cconn->chba->cdev->tx_max_size, max);
2104 if (conn->max_xmit_dlength)
2105 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2106 else
2107 conn->max_xmit_dlength = max;
2108 cxgbi_align_pdu_size(conn->max_xmit_dlength);
2109
2110 return 0;
2111 }
2112
2113 static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2114 {
2115 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2116 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2117 unsigned int max = cconn->chba->cdev->rx_max_size;
2118
2119 cxgbi_align_pdu_size(max);
2120
2121 if (conn->max_recv_dlength) {
2122 if (conn->max_recv_dlength > max) {
2123 pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2124 conn->max_recv_dlength, max);
2125 return -EINVAL;
2126 }
2127 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2128 cxgbi_align_pdu_size(conn->max_recv_dlength);
2129 } else
2130 conn->max_recv_dlength = max;
2131
2132 return 0;
2133 }
2134
2135 int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2136 enum iscsi_param param, char *buf, int buflen)
2137 {
2138 struct iscsi_conn *conn = cls_conn->dd_data;
2139 struct iscsi_session *session = conn->session;
2140 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2141 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2142 struct cxgbi_sock *csk = cconn->cep->csk;
2143 int value, err = 0;
2144
2145 log_debug(1 << CXGBI_DBG_ISCSI,
2146 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2147 cls_conn, param, buflen, buf);
2148
2149 switch (param) {
2150 case ISCSI_PARAM_HDRDGST_EN:
2151 err = iscsi_set_param(cls_conn, param, buf, buflen);
2152 if (!err && conn->hdrdgst_en)
2153 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2154 conn->hdrdgst_en,
2155 conn->datadgst_en, 0);
2156 break;
2157 case ISCSI_PARAM_DATADGST_EN:
2158 err = iscsi_set_param(cls_conn, param, buf, buflen);
2159 if (!err && conn->datadgst_en)
2160 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2161 conn->hdrdgst_en,
2162 conn->datadgst_en, 0);
2163 break;
2164 case ISCSI_PARAM_MAX_R2T:
2165 sscanf(buf, "%d", &value);
2166 if (value <= 0 || !is_power_of_2(value))
2167 return -EINVAL;
2168 if (session->max_r2t == value)
2169 break;
2170 iscsi_tcp_r2tpool_free(session);
2171 err = iscsi_set_param(cls_conn, param, buf, buflen);
2172 if (!err && iscsi_tcp_r2tpool_alloc(session))
2173 return -ENOMEM;
2174 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2175 err = iscsi_set_param(cls_conn, param, buf, buflen);
2176 if (!err)
2177 err = cxgbi_conn_max_recv_dlength(conn);
2178 break;
2179 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2180 err = iscsi_set_param(cls_conn, param, buf, buflen);
2181 if (!err)
2182 err = cxgbi_conn_max_xmit_dlength(conn);
2183 break;
2184 default:
2185 return iscsi_set_param(cls_conn, param, buf, buflen);
2186 }
2187 return err;
2188 }
2189 EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2190
2191 int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2192 char *buf)
2193 {
2194 struct cxgbi_endpoint *cep = ep->dd_data;
2195 struct cxgbi_sock *csk;
2196 int len;
2197
2198 log_debug(1 << CXGBI_DBG_ISCSI,
2199 "cls_conn 0x%p, param %d.\n", ep, param);
2200
2201 switch (param) {
2202 case ISCSI_PARAM_CONN_PORT:
2203 case ISCSI_PARAM_CONN_ADDRESS:
2204 if (!cep)
2205 return -ENOTCONN;
2206
2207 csk = cep->csk;
2208 if (!csk)
2209 return -ENOTCONN;
2210
2211 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2212 &csk->daddr, param, buf);
2213 default:
2214 return -ENOSYS;
2215 }
2216 return len;
2217 }
2218 EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
2219
2220 struct iscsi_cls_conn *
2221 cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2222 {
2223 struct iscsi_cls_conn *cls_conn;
2224 struct iscsi_conn *conn;
2225 struct iscsi_tcp_conn *tcp_conn;
2226 struct cxgbi_conn *cconn;
2227
2228 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2229 if (!cls_conn)
2230 return NULL;
2231
2232 conn = cls_conn->dd_data;
2233 tcp_conn = conn->dd_data;
2234 cconn = tcp_conn->dd_data;
2235 cconn->iconn = conn;
2236
2237 log_debug(1 << CXGBI_DBG_ISCSI,
2238 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2239 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2240
2241 return cls_conn;
2242 }
2243 EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2244
2245 int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2246 struct iscsi_cls_conn *cls_conn,
2247 u64 transport_eph, int is_leading)
2248 {
2249 struct iscsi_conn *conn = cls_conn->dd_data;
2250 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2251 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2252 struct iscsi_endpoint *ep;
2253 struct cxgbi_endpoint *cep;
2254 struct cxgbi_sock *csk;
2255 int err;
2256
2257 ep = iscsi_lookup_endpoint(transport_eph);
2258 if (!ep)
2259 return -EINVAL;
2260
2261 /* setup ddp pagesize */
2262 cep = ep->dd_data;
2263 csk = cep->csk;
2264 err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid, page_idx, 0);
2265 if (err < 0)
2266 return err;
2267
2268 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2269 if (err)
2270 return -EINVAL;
2271
2272 /* calculate the tag idx bits needed for this conn based on cmds_max */
2273 cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2274
2275 write_lock_bh(&csk->callback_lock);
2276 csk->user_data = conn;
2277 cconn->chba = cep->chba;
2278 cconn->cep = cep;
2279 cep->cconn = cconn;
2280 write_unlock_bh(&csk->callback_lock);
2281
2282 cxgbi_conn_max_xmit_dlength(conn);
2283 cxgbi_conn_max_recv_dlength(conn);
2284
2285 log_debug(1 << CXGBI_DBG_ISCSI,
2286 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2287 cls_session, cls_conn, ep, cconn, csk);
2288 /* init recv engine */
2289 iscsi_tcp_hdr_recv_prep(tcp_conn);
2290
2291 return 0;
2292 }
2293 EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2294
2295 struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2296 u16 cmds_max, u16 qdepth,
2297 u32 initial_cmdsn)
2298 {
2299 struct cxgbi_endpoint *cep;
2300 struct cxgbi_hba *chba;
2301 struct Scsi_Host *shost;
2302 struct iscsi_cls_session *cls_session;
2303 struct iscsi_session *session;
2304
2305 if (!ep) {
2306 pr_err("missing endpoint.\n");
2307 return NULL;
2308 }
2309
2310 cep = ep->dd_data;
2311 chba = cep->chba;
2312 shost = chba->shost;
2313
2314 BUG_ON(chba != iscsi_host_priv(shost));
2315
2316 cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2317 cmds_max, 0,
2318 sizeof(struct iscsi_tcp_task) +
2319 sizeof(struct cxgbi_task_data),
2320 initial_cmdsn, ISCSI_MAX_TARGET);
2321 if (!cls_session)
2322 return NULL;
2323
2324 session = cls_session->dd_data;
2325 if (iscsi_tcp_r2tpool_alloc(session))
2326 goto remove_session;
2327
2328 log_debug(1 << CXGBI_DBG_ISCSI,
2329 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2330 return cls_session;
2331
2332 remove_session:
2333 iscsi_session_teardown(cls_session);
2334 return NULL;
2335 }
2336 EXPORT_SYMBOL_GPL(cxgbi_create_session);
2337
2338 void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2339 {
2340 log_debug(1 << CXGBI_DBG_ISCSI,
2341 "cls sess 0x%p.\n", cls_session);
2342
2343 iscsi_tcp_r2tpool_free(cls_session->dd_data);
2344 iscsi_session_teardown(cls_session);
2345 }
2346 EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2347
2348 int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2349 char *buf, int buflen)
2350 {
2351 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2352
2353 if (!chba->ndev) {
2354 shost_printk(KERN_ERR, shost, "Could not get host param. "
2355 "netdev for host not set.\n");
2356 return -ENODEV;
2357 }
2358
2359 log_debug(1 << CXGBI_DBG_ISCSI,
2360 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2361 shost, chba, chba->ndev->name, param, buflen, buf);
2362
2363 switch (param) {
2364 case ISCSI_HOST_PARAM_IPADDRESS:
2365 {
2366 __be32 addr = in_aton(buf);
2367 log_debug(1 << CXGBI_DBG_ISCSI,
2368 "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2369 cxgbi_set_iscsi_ipv4(chba, addr);
2370 return 0;
2371 }
2372 case ISCSI_HOST_PARAM_HWADDRESS:
2373 case ISCSI_HOST_PARAM_NETDEV_NAME:
2374 return 0;
2375 default:
2376 return iscsi_host_set_param(shost, param, buf, buflen);
2377 }
2378 }
2379 EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2380
2381 int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2382 char *buf)
2383 {
2384 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2385 int len = 0;
2386
2387 if (!chba->ndev) {
2388 shost_printk(KERN_ERR, shost, "Could not get host param. "
2389 "netdev for host not set.\n");
2390 return -ENODEV;
2391 }
2392
2393 log_debug(1 << CXGBI_DBG_ISCSI,
2394 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2395 shost, chba, chba->ndev->name, param);
2396
2397 switch (param) {
2398 case ISCSI_HOST_PARAM_HWADDRESS:
2399 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2400 break;
2401 case ISCSI_HOST_PARAM_NETDEV_NAME:
2402 len = sprintf(buf, "%s\n", chba->ndev->name);
2403 break;
2404 case ISCSI_HOST_PARAM_IPADDRESS:
2405 {
2406 __be32 addr;
2407
2408 addr = cxgbi_get_iscsi_ipv4(chba);
2409 len = sprintf(buf, "%pI4", &addr);
2410 log_debug(1 << CXGBI_DBG_ISCSI,
2411 "hba %s, ipv4 %pI4.\n", chba->ndev->name, &addr);
2412 break;
2413 }
2414 default:
2415 return iscsi_host_get_param(shost, param, buf);
2416 }
2417
2418 return len;
2419 }
2420 EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2421
2422 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2423 struct sockaddr *dst_addr,
2424 int non_blocking)
2425 {
2426 struct iscsi_endpoint *ep;
2427 struct cxgbi_endpoint *cep;
2428 struct cxgbi_hba *hba = NULL;
2429 struct cxgbi_sock *csk;
2430 int err = -EINVAL;
2431
2432 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2433 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2434 shost, non_blocking, dst_addr);
2435
2436 if (shost) {
2437 hba = iscsi_host_priv(shost);
2438 if (!hba) {
2439 pr_info("shost 0x%p, priv NULL.\n", shost);
2440 goto err_out;
2441 }
2442 }
2443
2444 csk = cxgbi_check_route(dst_addr);
2445 if (IS_ERR(csk))
2446 return (struct iscsi_endpoint *)csk;
2447 cxgbi_sock_get(csk);
2448
2449 if (!hba)
2450 hba = csk->cdev->hbas[csk->port_id];
2451 else if (hba != csk->cdev->hbas[csk->port_id]) {
2452 pr_info("Could not connect through requested host %u"
2453 "hba 0x%p != 0x%p (%u).\n",
2454 shost->host_no, hba,
2455 csk->cdev->hbas[csk->port_id], csk->port_id);
2456 err = -ENOSPC;
2457 goto release_conn;
2458 }
2459
2460 err = sock_get_port(csk);
2461 if (err)
2462 goto release_conn;
2463
2464 cxgbi_sock_set_state(csk, CTP_CONNECTING);
2465 err = csk->cdev->csk_init_act_open(csk);
2466 if (err)
2467 goto release_conn;
2468
2469 if (cxgbi_sock_is_closing(csk)) {
2470 err = -ENOSPC;
2471 pr_info("csk 0x%p is closing.\n", csk);
2472 goto release_conn;
2473 }
2474
2475 ep = iscsi_create_endpoint(sizeof(*cep));
2476 if (!ep) {
2477 err = -ENOMEM;
2478 pr_info("iscsi alloc ep, OOM.\n");
2479 goto release_conn;
2480 }
2481
2482 cep = ep->dd_data;
2483 cep->csk = csk;
2484 cep->chba = hba;
2485
2486 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2487 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2488 ep, cep, csk, hba, hba->ndev->name);
2489 return ep;
2490
2491 release_conn:
2492 cxgbi_sock_put(csk);
2493 cxgbi_sock_closed(csk);
2494 err_out:
2495 return ERR_PTR(err);
2496 }
2497 EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2498
2499 int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2500 {
2501 struct cxgbi_endpoint *cep = ep->dd_data;
2502 struct cxgbi_sock *csk = cep->csk;
2503
2504 if (!cxgbi_sock_is_established(csk))
2505 return 0;
2506 return 1;
2507 }
2508 EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2509
2510 void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2511 {
2512 struct cxgbi_endpoint *cep = ep->dd_data;
2513 struct cxgbi_conn *cconn = cep->cconn;
2514 struct cxgbi_sock *csk = cep->csk;
2515
2516 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2517 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2518 ep, cep, cconn, csk, csk->state, csk->flags);
2519
2520 if (cconn && cconn->iconn) {
2521 iscsi_suspend_tx(cconn->iconn);
2522 write_lock_bh(&csk->callback_lock);
2523 cep->csk->user_data = NULL;
2524 cconn->cep = NULL;
2525 write_unlock_bh(&csk->callback_lock);
2526 }
2527 iscsi_destroy_endpoint(ep);
2528
2529 if (likely(csk->state >= CTP_ESTABLISHED))
2530 need_active_close(csk);
2531 else
2532 cxgbi_sock_closed(csk);
2533
2534 cxgbi_sock_put(csk);
2535 }
2536 EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2537
2538 int cxgbi_iscsi_init(struct iscsi_transport *itp,
2539 struct scsi_transport_template **stt)
2540 {
2541 *stt = iscsi_register_transport(itp);
2542 if (*stt == NULL) {
2543 pr_err("unable to register %s transport 0x%p.\n",
2544 itp->name, itp);
2545 return -ENODEV;
2546 }
2547 log_debug(1 << CXGBI_DBG_ISCSI,
2548 "%s, registered iscsi transport 0x%p.\n",
2549 itp->name, stt);
2550 return 0;
2551 }
2552 EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2553
2554 void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2555 struct scsi_transport_template **stt)
2556 {
2557 if (*stt) {
2558 log_debug(1 << CXGBI_DBG_ISCSI,
2559 "de-register transport 0x%p, %s, stt 0x%p.\n",
2560 itp, itp->name, *stt);
2561 *stt = NULL;
2562 iscsi_unregister_transport(itp);
2563 }
2564 }
2565 EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2566
2567 static int __init libcxgbi_init_module(void)
2568 {
2569 sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
2570 sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
2571
2572 pr_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
2573 ISCSI_ITT_MASK, sw_tag_idx_bits,
2574 ISCSI_AGE_MASK, sw_tag_age_bits);
2575
2576 ddp_setup_host_page_size();
2577 return 0;
2578 }
2579
2580 static void __exit libcxgbi_exit_module(void)
2581 {
2582 cxgbi_device_unregister_all(0xFF);
2583 return;
2584 }
2585
2586 module_init(libcxgbi_init_module);
2587 module_exit(libcxgbi_exit_module);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree