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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[linux-2.6.git] / drivers / scsi / cxgbi / libcxgbi.c
blobb44c1cff3114bb9a6aa6467540a3755d722ef5b3
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 neighbour *n;
476 struct flowi4 fl4;
477 struct cxgbi_sock *csk = NULL;
478 unsigned int mtu = 0;
479 int port = 0xFFFF;
480 int err = 0;
481
482 if (daddr->sin_family != AF_INET) {
483 pr_info("address family 0x%x NOT supported.\n",
484 daddr->sin_family);
485 err = -EAFNOSUPPORT;
486 goto err_out;
487 }
488
489 rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0, daddr->sin_port, 0);
490 if (!rt) {
491 pr_info("no route to ipv4 0x%x, port %u.\n",
492 daddr->sin_addr.s_addr, daddr->sin_port);
493 err = -ENETUNREACH;
494 goto err_out;
495 }
496 dst = &rt->dst;
497 n = dst_neigh_lookup(dst, &daddr->sin_addr.s_addr);
498 if (!n) {
499 err = -ENODEV;
500 goto rel_rt;
501 }
502 ndev = n->dev;
503
504 if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
505 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
506 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
507 ndev->name);
508 err = -ENETUNREACH;
509 goto rel_neigh;
510 }
511
512 if (ndev->flags & IFF_LOOPBACK) {
513 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
514 mtu = ndev->mtu;
515 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
516 n->dev->name, ndev->name, mtu);
517 }
518
519 cdev = cxgbi_device_find_by_netdev(ndev, &port);
520 if (!cdev) {
521 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
522 &daddr->sin_addr.s_addr, ndev->name);
523 err = -ENETUNREACH;
524 goto rel_neigh;
525 }
526 log_debug(1 << CXGBI_DBG_SOCK,
527 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
528 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
529 port, ndev->name, cdev);
530
531 csk = cxgbi_sock_create(cdev);
532 if (!csk) {
533 err = -ENOMEM;
534 goto rel_neigh;
535 }
536 csk->cdev = cdev;
537 csk->port_id = port;
538 csk->mtu = mtu;
539 csk->dst = dst;
540 csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
541 csk->daddr.sin_port = daddr->sin_port;
542 csk->daddr.sin_family = daddr->sin_family;
543 csk->saddr.sin_addr.s_addr = fl4.saddr;
544 neigh_release(n);
545
546 return csk;
547
548 rel_neigh:
549 neigh_release(n);
550
551 rel_rt:
552 ip_rt_put(rt);
553 if (csk)
554 cxgbi_sock_closed(csk);
555 err_out:
556 return ERR_PTR(err);
557 }
558
559 void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
560 unsigned int opt)
561 {
562 csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
563 dst_confirm(csk->dst);
564 smp_mb();
565 cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
566 }
567 EXPORT_SYMBOL_GPL(cxgbi_sock_established);
568
569 static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
570 {
571 log_debug(1 << CXGBI_DBG_SOCK,
572 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
573 csk, csk->state, csk->flags, csk->user_data);
574
575 if (csk->state != CTP_ESTABLISHED) {
576 read_lock_bh(&csk->callback_lock);
577 if (csk->user_data)
578 iscsi_conn_failure(csk->user_data,
579 ISCSI_ERR_CONN_FAILED);
580 read_unlock_bh(&csk->callback_lock);
581 }
582 }
583
584 void cxgbi_sock_closed(struct cxgbi_sock *csk)
585 {
586 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
587 csk, (csk)->state, (csk)->flags, (csk)->tid);
588 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
589 if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
590 return;
591 if (csk->saddr.sin_port)
592 sock_put_port(csk);
593 if (csk->dst)
594 dst_release(csk->dst);
595 csk->cdev->csk_release_offload_resources(csk);
596 cxgbi_sock_set_state(csk, CTP_CLOSED);
597 cxgbi_inform_iscsi_conn_closing(csk);
598 cxgbi_sock_put(csk);
599 }
600 EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
601
602 static void need_active_close(struct cxgbi_sock *csk)
603 {
604 int data_lost;
605 int close_req = 0;
606
607 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
608 csk, (csk)->state, (csk)->flags, (csk)->tid);
609 spin_lock_bh(&csk->lock);
610 dst_confirm(csk->dst);
611 data_lost = skb_queue_len(&csk->receive_queue);
612 __skb_queue_purge(&csk->receive_queue);
613
614 if (csk->state == CTP_ACTIVE_OPEN)
615 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
616 else if (csk->state == CTP_ESTABLISHED) {
617 close_req = 1;
618 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
619 } else if (csk->state == CTP_PASSIVE_CLOSE) {
620 close_req = 1;
621 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
622 }
623
624 if (close_req) {
625 if (data_lost)
626 csk->cdev->csk_send_abort_req(csk);
627 else
628 csk->cdev->csk_send_close_req(csk);
629 }
630
631 spin_unlock_bh(&csk->lock);
632 }
633
634 void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
635 {
636 pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
637 csk, csk->state, csk->flags,
638 &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
639 &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
640 errno);
641
642 cxgbi_sock_set_state(csk, CTP_CONNECTING);
643 csk->err = errno;
644 cxgbi_sock_closed(csk);
645 }
646 EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
647
648 void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
649 {
650 struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
651
652 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
653 csk, (csk)->state, (csk)->flags, (csk)->tid);
654 cxgbi_sock_get(csk);
655 spin_lock_bh(&csk->lock);
656 if (csk->state == CTP_ACTIVE_OPEN)
657 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
658 spin_unlock_bh(&csk->lock);
659 cxgbi_sock_put(csk);
660 __kfree_skb(skb);
661 }
662 EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
663
664 void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
665 {
666 cxgbi_sock_get(csk);
667 spin_lock_bh(&csk->lock);
668 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
669 if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_RCVD))
670 cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
671 else {
672 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_RCVD);
673 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
674 if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
675 pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
676 csk, csk->state, csk->flags, csk->tid);
677 cxgbi_sock_closed(csk);
678 }
679 }
680 spin_unlock_bh(&csk->lock);
681 cxgbi_sock_put(csk);
682 }
683 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
684
685 void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
686 {
687 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
688 csk, (csk)->state, (csk)->flags, (csk)->tid);
689 cxgbi_sock_get(csk);
690 spin_lock_bh(&csk->lock);
691
692 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
693 goto done;
694
695 switch (csk->state) {
696 case CTP_ESTABLISHED:
697 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
698 break;
699 case CTP_ACTIVE_CLOSE:
700 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
701 break;
702 case CTP_CLOSE_WAIT_1:
703 cxgbi_sock_closed(csk);
704 break;
705 case CTP_ABORTING:
706 break;
707 default:
708 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
709 csk, csk->state, csk->flags, csk->tid);
710 }
711 cxgbi_inform_iscsi_conn_closing(csk);
712 done:
713 spin_unlock_bh(&csk->lock);
714 cxgbi_sock_put(csk);
715 }
716 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
717
718 void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
719 {
720 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
721 csk, (csk)->state, (csk)->flags, (csk)->tid);
722 cxgbi_sock_get(csk);
723 spin_lock_bh(&csk->lock);
724
725 csk->snd_una = snd_nxt - 1;
726 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
727 goto done;
728
729 switch (csk->state) {
730 case CTP_ACTIVE_CLOSE:
731 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
732 break;
733 case CTP_CLOSE_WAIT_1:
734 case CTP_CLOSE_WAIT_2:
735 cxgbi_sock_closed(csk);
736 break;
737 case CTP_ABORTING:
738 break;
739 default:
740 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
741 csk, csk->state, csk->flags, csk->tid);
742 }
743 done:
744 spin_unlock_bh(&csk->lock);
745 cxgbi_sock_put(csk);
746 }
747 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
748
749 void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
750 unsigned int snd_una, int seq_chk)
751 {
752 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
753 "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
754 csk, csk->state, csk->flags, csk->tid, credits,
755 csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
756
757 spin_lock_bh(&csk->lock);
758
759 csk->wr_cred += credits;
760 if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
761 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
762
763 while (credits) {
764 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
765
766 if (unlikely(!p)) {
767 pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
768 csk, csk->state, csk->flags, csk->tid, credits,
769 csk->wr_cred, csk->wr_una_cred);
770 break;
771 }
772
773 if (unlikely(credits < p->csum)) {
774 pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
775 csk, csk->state, csk->flags, csk->tid,
776 credits, csk->wr_cred, csk->wr_una_cred,
777 p->csum);
778 p->csum -= credits;
779 break;
780 } else {
781 cxgbi_sock_dequeue_wr(csk);
782 credits -= p->csum;
783 kfree_skb(p);
784 }
785 }
786
787 cxgbi_sock_check_wr_invariants(csk);
788
789 if (seq_chk) {
790 if (unlikely(before(snd_una, csk->snd_una))) {
791 pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
792 csk, csk->state, csk->flags, csk->tid, snd_una,
793 csk->snd_una);
794 goto done;
795 }
796
797 if (csk->snd_una != snd_una) {
798 csk->snd_una = snd_una;
799 dst_confirm(csk->dst);
800 }
801 }
802
803 if (skb_queue_len(&csk->write_queue)) {
804 if (csk->cdev->csk_push_tx_frames(csk, 0))
805 cxgbi_conn_tx_open(csk);
806 } else
807 cxgbi_conn_tx_open(csk);
808 done:
809 spin_unlock_bh(&csk->lock);
810 }
811 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
812
813 static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
814 unsigned short mtu)
815 {
816 int i = 0;
817
818 while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
819 ++i;
820
821 return i;
822 }
823
824 unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
825 {
826 unsigned int idx;
827 struct dst_entry *dst = csk->dst;
828
829 csk->advmss = dst_metric_advmss(dst);
830
831 if (csk->advmss > pmtu - 40)
832 csk->advmss = pmtu - 40;
833 if (csk->advmss < csk->cdev->mtus[0] - 40)
834 csk->advmss = csk->cdev->mtus[0] - 40;
835 idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
836
837 return idx;
838 }
839 EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
840
841 void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
842 {
843 cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
844 __skb_queue_tail(&csk->write_queue, skb);
845 }
846 EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
847
848 void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
849 {
850 struct sk_buff *skb;
851
852 while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
853 kfree_skb(skb);
854 }
855 EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
856
857 void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
858 {
859 int pending = cxgbi_sock_count_pending_wrs(csk);
860
861 if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
862 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
863 csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
864 }
865 EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
866
867 static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
868 {
869 struct cxgbi_device *cdev = csk->cdev;
870 struct sk_buff *next;
871 int err, copied = 0;
872
873 spin_lock_bh(&csk->lock);
874
875 if (csk->state != CTP_ESTABLISHED) {
876 log_debug(1 << CXGBI_DBG_PDU_TX,
877 "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
878 csk, csk->state, csk->flags, csk->tid);
879 err = -EAGAIN;
880 goto out_err;
881 }
882
883 if (csk->err) {
884 log_debug(1 << CXGBI_DBG_PDU_TX,
885 "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
886 csk, csk->state, csk->flags, csk->tid, csk->err);
887 err = -EPIPE;
888 goto out_err;
889 }
890
891 if (csk->write_seq - csk->snd_una >= cdev->snd_win) {
892 log_debug(1 << CXGBI_DBG_PDU_TX,
893 "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
894 csk, csk->state, csk->flags, csk->tid, csk->write_seq,
895 csk->snd_una, cdev->snd_win);
896 err = -ENOBUFS;
897 goto out_err;
898 }
899
900 while (skb) {
901 int frags = skb_shinfo(skb)->nr_frags +
902 (skb->len != skb->data_len);
903
904 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
905 pr_err("csk 0x%p, skb head %u < %u.\n",
906 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
907 err = -EINVAL;
908 goto out_err;
909 }
910
911 if (frags >= SKB_WR_LIST_SIZE) {
912 pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
913 csk, skb_shinfo(skb)->nr_frags, skb->len,
914 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
915 err = -EINVAL;
916 goto out_err;
917 }
918
919 next = skb->next;
920 skb->next = NULL;
921 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
922 cxgbi_sock_skb_entail(csk, skb);
923 copied += skb->len;
924 csk->write_seq += skb->len +
925 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
926 skb = next;
927 }
928 done:
929 if (likely(skb_queue_len(&csk->write_queue)))
930 cdev->csk_push_tx_frames(csk, 1);
931 spin_unlock_bh(&csk->lock);
932 return copied;
933
934 out_err:
935 if (copied == 0 && err == -EPIPE)
936 copied = csk->err ? csk->err : -EPIPE;
937 else
938 copied = err;
939 goto done;
940 }
941
942 /*
943 * Direct Data Placement -
944 * Directly place the iSCSI Data-In or Data-Out PDU's payload into pre-posted
945 * final destination host-memory buffers based on the Initiator Task Tag (ITT)
946 * in Data-In or Target Task Tag (TTT) in Data-Out PDUs.
947 * The host memory address is programmed into h/w in the format of pagepod
948 * entries.
949 * The location of the pagepod entry is encoded into ddp tag which is used as
950 * the base for ITT/TTT.
951 */
952
953 static unsigned char ddp_page_order[DDP_PGIDX_MAX] = {0, 1, 2, 4};
954 static unsigned char ddp_page_shift[DDP_PGIDX_MAX] = {12, 13, 14, 16};
955 static unsigned char page_idx = DDP_PGIDX_MAX;
956
957 static unsigned char sw_tag_idx_bits;
958 static unsigned char sw_tag_age_bits;
959
960 /*
961 * Direct-Data Placement page size adjustment
962 */
963 static int ddp_adjust_page_table(void)
964 {
965 int i;
966 unsigned int base_order, order;
967
968 if (PAGE_SIZE < (1UL << ddp_page_shift[0])) {
969 pr_info("PAGE_SIZE 0x%lx too small, min 0x%lx\n",
970 PAGE_SIZE, 1UL << ddp_page_shift[0]);
971 return -EINVAL;
972 }
973
974 base_order = get_order(1UL << ddp_page_shift[0]);
975 order = get_order(1UL << PAGE_SHIFT);
976
977 for (i = 0; i < DDP_PGIDX_MAX; i++) {
978 /* first is the kernel page size, then just doubling */
979 ddp_page_order[i] = order - base_order + i;
980 ddp_page_shift[i] = PAGE_SHIFT + i;
981 }
982 return 0;
983 }
984
985 static int ddp_find_page_index(unsigned long pgsz)
986 {
987 int i;
988
989 for (i = 0; i < DDP_PGIDX_MAX; i++) {
990 if (pgsz == (1UL << ddp_page_shift[i]))
991 return i;
992 }
993 pr_info("ddp page size %lu not supported.\n", pgsz);
994 return DDP_PGIDX_MAX;
995 }
996
997 static void ddp_setup_host_page_size(void)
998 {
999 if (page_idx == DDP_PGIDX_MAX) {
1000 page_idx = ddp_find_page_index(PAGE_SIZE);
1001
1002 if (page_idx == DDP_PGIDX_MAX) {
1003 pr_info("system PAGE %lu, update hw.\n", PAGE_SIZE);
1004 if (ddp_adjust_page_table() < 0) {
1005 pr_info("PAGE %lu, disable ddp.\n", PAGE_SIZE);
1006 return;
1007 }
1008 page_idx = ddp_find_page_index(PAGE_SIZE);
1009 }
1010 pr_info("system PAGE %lu, ddp idx %u.\n", PAGE_SIZE, page_idx);
1011 }
1012 }
1013
1014 void cxgbi_ddp_page_size_factor(int *pgsz_factor)
1015 {
1016 int i;
1017
1018 for (i = 0; i < DDP_PGIDX_MAX; i++)
1019 pgsz_factor[i] = ddp_page_order[i];
1020 }
1021 EXPORT_SYMBOL_GPL(cxgbi_ddp_page_size_factor);
1022
1023 /*
1024 * DDP setup & teardown
1025 */
1026
1027 void cxgbi_ddp_ppod_set(struct cxgbi_pagepod *ppod,
1028 struct cxgbi_pagepod_hdr *hdr,
1029 struct cxgbi_gather_list *gl, unsigned int gidx)
1030 {
1031 int i;
1032
1033 memcpy(ppod, hdr, sizeof(*hdr));
1034 for (i = 0; i < (PPOD_PAGES_MAX + 1); i++, gidx++) {
1035 ppod->addr[i] = gidx < gl->nelem ?
1036 cpu_to_be64(gl->phys_addr[gidx]) : 0ULL;
1037 }
1038 }
1039 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_set);
1040
1041 void cxgbi_ddp_ppod_clear(struct cxgbi_pagepod *ppod)
1042 {
1043 memset(ppod, 0, sizeof(*ppod));
1044 }
1045 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_clear);
1046
1047 static inline int ddp_find_unused_entries(struct cxgbi_ddp_info *ddp,
1048 unsigned int start, unsigned int max,
1049 unsigned int count,
1050 struct cxgbi_gather_list *gl)
1051 {
1052 unsigned int i, j, k;
1053
1054 /* not enough entries */
1055 if ((max - start) < count) {
1056 log_debug(1 << CXGBI_DBG_DDP,
1057 "NOT enough entries %u+%u < %u.\n", start, count, max);
1058 return -EBUSY;
1059 }
1060
1061 max -= count;
1062 spin_lock(&ddp->map_lock);
1063 for (i = start; i < max;) {
1064 for (j = 0, k = i; j < count; j++, k++) {
1065 if (ddp->gl_map[k])
1066 break;
1067 }
1068 if (j == count) {
1069 for (j = 0, k = i; j < count; j++, k++)
1070 ddp->gl_map[k] = gl;
1071 spin_unlock(&ddp->map_lock);
1072 return i;
1073 }
1074 i += j + 1;
1075 }
1076 spin_unlock(&ddp->map_lock);
1077 log_debug(1 << CXGBI_DBG_DDP,
1078 "NO suitable entries %u available.\n", count);
1079 return -EBUSY;
1080 }
1081
1082 static inline void ddp_unmark_entries(struct cxgbi_ddp_info *ddp,
1083 int start, int count)
1084 {
1085 spin_lock(&ddp->map_lock);
1086 memset(&ddp->gl_map[start], 0,
1087 count * sizeof(struct cxgbi_gather_list *));
1088 spin_unlock(&ddp->map_lock);
1089 }
1090
1091 static inline void ddp_gl_unmap(struct pci_dev *pdev,
1092 struct cxgbi_gather_list *gl)
1093 {
1094 int i;
1095
1096 for (i = 0; i < gl->nelem; i++)
1097 dma_unmap_page(&pdev->dev, gl->phys_addr[i], PAGE_SIZE,
1098 PCI_DMA_FROMDEVICE);
1099 }
1100
1101 static inline int ddp_gl_map(struct pci_dev *pdev,
1102 struct cxgbi_gather_list *gl)
1103 {
1104 int i;
1105
1106 for (i = 0; i < gl->nelem; i++) {
1107 gl->phys_addr[i] = dma_map_page(&pdev->dev, gl->pages[i], 0,
1108 PAGE_SIZE,
1109 PCI_DMA_FROMDEVICE);
1110 if (unlikely(dma_mapping_error(&pdev->dev, gl->phys_addr[i]))) {
1111 log_debug(1 << CXGBI_DBG_DDP,
1112 "page %d 0x%p, 0x%p dma mapping err.\n",
1113 i, gl->pages[i], pdev);
1114 goto unmap;
1115 }
1116 }
1117 return i;
1118 unmap:
1119 if (i) {
1120 unsigned int nelem = gl->nelem;
1121
1122 gl->nelem = i;
1123 ddp_gl_unmap(pdev, gl);
1124 gl->nelem = nelem;
1125 }
1126 return -EINVAL;
1127 }
1128
1129 static void ddp_release_gl(struct cxgbi_gather_list *gl,
1130 struct pci_dev *pdev)
1131 {
1132 ddp_gl_unmap(pdev, gl);
1133 kfree(gl);
1134 }
1135
1136 static struct cxgbi_gather_list *ddp_make_gl(unsigned int xferlen,
1137 struct scatterlist *sgl,
1138 unsigned int sgcnt,
1139 struct pci_dev *pdev,
1140 gfp_t gfp)
1141 {
1142 struct cxgbi_gather_list *gl;
1143 struct scatterlist *sg = sgl;
1144 struct page *sgpage = sg_page(sg);
1145 unsigned int sglen = sg->length;
1146 unsigned int sgoffset = sg->offset;
1147 unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >>
1148 PAGE_SHIFT;
1149 int i = 1, j = 0;
1150
1151 if (xferlen < DDP_THRESHOLD) {
1152 log_debug(1 << CXGBI_DBG_DDP,
1153 "xfer %u < threshold %u, no ddp.\n",
1154 xferlen, DDP_THRESHOLD);
1155 return NULL;
1156 }
1157
1158 gl = kzalloc(sizeof(struct cxgbi_gather_list) +
1159 npages * (sizeof(dma_addr_t) +
1160 sizeof(struct page *)), gfp);
1161 if (!gl) {
1162 log_debug(1 << CXGBI_DBG_DDP,
1163 "xfer %u, %u pages, OOM.\n", xferlen, npages);
1164 return NULL;
1165 }
1166
1167 log_debug(1 << CXGBI_DBG_DDP,
1168 "xfer %u, sgl %u, gl max %u.\n", xferlen, sgcnt, npages);
1169
1170 gl->pages = (struct page **)&gl->phys_addr[npages];
1171 gl->nelem = npages;
1172 gl->length = xferlen;
1173 gl->offset = sgoffset;
1174 gl->pages[0] = sgpage;
1175
1176 for (i = 1, sg = sg_next(sgl), j = 0; i < sgcnt;
1177 i++, sg = sg_next(sg)) {
1178 struct page *page = sg_page(sg);
1179
1180 if (sgpage == page && sg->offset == sgoffset + sglen)
1181 sglen += sg->length;
1182 else {
1183 /* make sure the sgl is fit for ddp:
1184 * each has the same page size, and
1185 * all of the middle pages are used completely
1186 */
1187 if ((j && sgoffset) || ((i != sgcnt - 1) &&
1188 ((sglen + sgoffset) & ~PAGE_MASK))) {
1189 log_debug(1 << CXGBI_DBG_DDP,
1190 "page %d/%u, %u + %u.\n",
1191 i, sgcnt, sgoffset, sglen);
1192 goto error_out;
1193 }
1194
1195 j++;
1196 if (j == gl->nelem || sg->offset) {
1197 log_debug(1 << CXGBI_DBG_DDP,
1198 "page %d/%u, offset %u.\n",
1199 j, gl->nelem, sg->offset);
1200 goto error_out;
1201 }
1202 gl->pages[j] = page;
1203 sglen = sg->length;
1204 sgoffset = sg->offset;
1205 sgpage = page;
1206 }
1207 }
1208 gl->nelem = ++j;
1209
1210 if (ddp_gl_map(pdev, gl) < 0)
1211 goto error_out;
1212
1213 return gl;
1214
1215 error_out:
1216 kfree(gl);
1217 return NULL;
1218 }
1219
1220 static void ddp_tag_release(struct cxgbi_hba *chba, u32 tag)
1221 {
1222 struct cxgbi_device *cdev = chba->cdev;
1223 struct cxgbi_ddp_info *ddp = cdev->ddp;
1224 u32 idx;
1225
1226 idx = (tag >> PPOD_IDX_SHIFT) & ddp->idx_mask;
1227 if (idx < ddp->nppods) {
1228 struct cxgbi_gather_list *gl = ddp->gl_map[idx];
1229 unsigned int npods;
1230
1231 if (!gl || !gl->nelem) {
1232 pr_warn("tag 0x%x, idx %u, gl 0x%p, %u.\n",
1233 tag, idx, gl, gl ? gl->nelem : 0);
1234 return;
1235 }
1236 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1237 log_debug(1 << CXGBI_DBG_DDP,
1238 "tag 0x%x, release idx %u, npods %u.\n",
1239 tag, idx, npods);
1240 cdev->csk_ddp_clear(chba, tag, idx, npods);
1241 ddp_unmark_entries(ddp, idx, npods);
1242 ddp_release_gl(gl, ddp->pdev);
1243 } else
1244 pr_warn("tag 0x%x, idx %u > max %u.\n", tag, idx, ddp->nppods);
1245 }
1246
1247 static int ddp_tag_reserve(struct cxgbi_sock *csk, unsigned int tid,
1248 u32 sw_tag, u32 *tagp, struct cxgbi_gather_list *gl,
1249 gfp_t gfp)
1250 {
1251 struct cxgbi_device *cdev = csk->cdev;
1252 struct cxgbi_ddp_info *ddp = cdev->ddp;
1253 struct cxgbi_tag_format *tformat = &cdev->tag_format;
1254 struct cxgbi_pagepod_hdr hdr;
1255 unsigned int npods;
1256 int idx = -1;
1257 int err = -ENOMEM;
1258 u32 tag;
1259
1260 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1261 if (ddp->idx_last == ddp->nppods)
1262 idx = ddp_find_unused_entries(ddp, 0, ddp->nppods,
1263 npods, gl);
1264 else {
1265 idx = ddp_find_unused_entries(ddp, ddp->idx_last + 1,
1266 ddp->nppods, npods,
1267 gl);
1268 if (idx < 0 && ddp->idx_last >= npods) {
1269 idx = ddp_find_unused_entries(ddp, 0,
1270 min(ddp->idx_last + npods, ddp->nppods),
1271 npods, gl);
1272 }
1273 }
1274 if (idx < 0) {
1275 log_debug(1 << CXGBI_DBG_DDP,
1276 "xferlen %u, gl %u, npods %u NO DDP.\n",
1277 gl->length, gl->nelem, npods);
1278 return idx;
1279 }
1280
1281 tag = cxgbi_ddp_tag_base(tformat, sw_tag);
1282 tag |= idx << PPOD_IDX_SHIFT;
1283
1284 hdr.rsvd = 0;
1285 hdr.vld_tid = htonl(PPOD_VALID_FLAG | PPOD_TID(tid));
1286 hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask);
1287 hdr.max_offset = htonl(gl->length);
1288 hdr.page_offset = htonl(gl->offset);
1289
1290 err = cdev->csk_ddp_set(csk, &hdr, idx, npods, gl);
1291 if (err < 0)
1292 goto unmark_entries;
1293
1294 ddp->idx_last = idx;
1295 log_debug(1 << CXGBI_DBG_DDP,
1296 "xfer %u, gl %u,%u, tid 0x%x, tag 0x%x->0x%x(%u,%u).\n",
1297 gl->length, gl->nelem, gl->offset, tid, sw_tag, tag, idx,
1298 npods);
1299 *tagp = tag;
1300 return 0;
1301
1302 unmark_entries:
1303 ddp_unmark_entries(ddp, idx, npods);
1304 return err;
1305 }
1306
1307 int cxgbi_ddp_reserve(struct cxgbi_sock *csk, unsigned int *tagp,
1308 unsigned int sw_tag, unsigned int xferlen,
1309 struct scatterlist *sgl, unsigned int sgcnt, gfp_t gfp)
1310 {
1311 struct cxgbi_device *cdev = csk->cdev;
1312 struct cxgbi_tag_format *tformat = &cdev->tag_format;
1313 struct cxgbi_gather_list *gl;
1314 int err;
1315
1316 if (page_idx >= DDP_PGIDX_MAX || !cdev->ddp ||
1317 xferlen < DDP_THRESHOLD) {
1318 log_debug(1 << CXGBI_DBG_DDP,
1319 "pgidx %u, xfer %u, NO ddp.\n", page_idx, xferlen);
1320 return -EINVAL;
1321 }
1322
1323 if (!cxgbi_sw_tag_usable(tformat, sw_tag)) {
1324 log_debug(1 << CXGBI_DBG_DDP,
1325 "sw_tag 0x%x NOT usable.\n", sw_tag);
1326 return -EINVAL;
1327 }
1328
1329 gl = ddp_make_gl(xferlen, sgl, sgcnt, cdev->pdev, gfp);
1330 if (!gl)
1331 return -ENOMEM;
1332
1333 err = ddp_tag_reserve(csk, csk->tid, sw_tag, tagp, gl, gfp);
1334 if (err < 0)
1335 ddp_release_gl(gl, cdev->pdev);
1336
1337 return err;
1338 }
1339
1340 static void ddp_destroy(struct kref *kref)
1341 {
1342 struct cxgbi_ddp_info *ddp = container_of(kref,
1343 struct cxgbi_ddp_info,
1344 refcnt);
1345 struct cxgbi_device *cdev = ddp->cdev;
1346 int i = 0;
1347
1348 pr_info("kref 0, destroy ddp 0x%p, cdev 0x%p.\n", ddp, cdev);
1349
1350 while (i < ddp->nppods) {
1351 struct cxgbi_gather_list *gl = ddp->gl_map[i];
1352
1353 if (gl) {
1354 int npods = (gl->nelem + PPOD_PAGES_MAX - 1)
1355 >> PPOD_PAGES_SHIFT;
1356 pr_info("cdev 0x%p, ddp %d + %d.\n", cdev, i, npods);
1357 kfree(gl);
1358 i += npods;
1359 } else
1360 i++;
1361 }
1362 cxgbi_free_big_mem(ddp);
1363 }
1364
1365 int cxgbi_ddp_cleanup(struct cxgbi_device *cdev)
1366 {
1367 struct cxgbi_ddp_info *ddp = cdev->ddp;
1368
1369 log_debug(1 << CXGBI_DBG_DDP,
1370 "cdev 0x%p, release ddp 0x%p.\n", cdev, ddp);
1371 cdev->ddp = NULL;
1372 if (ddp)
1373 return kref_put(&ddp->refcnt, ddp_destroy);
1374 return 0;
1375 }
1376 EXPORT_SYMBOL_GPL(cxgbi_ddp_cleanup);
1377
1378 int cxgbi_ddp_init(struct cxgbi_device *cdev,
1379 unsigned int llimit, unsigned int ulimit,
1380 unsigned int max_txsz, unsigned int max_rxsz)
1381 {
1382 struct cxgbi_ddp_info *ddp;
1383 unsigned int ppmax, bits;
1384
1385 ppmax = (ulimit - llimit + 1) >> PPOD_SIZE_SHIFT;
1386 bits = __ilog2_u32(ppmax) + 1;
1387 if (bits > PPOD_IDX_MAX_SIZE)
1388 bits = PPOD_IDX_MAX_SIZE;
1389 ppmax = (1 << (bits - 1)) - 1;
1390
1391 ddp = cxgbi_alloc_big_mem(sizeof(struct cxgbi_ddp_info) +
1392 ppmax * (sizeof(struct cxgbi_gather_list *) +
1393 sizeof(struct sk_buff *)),
1394 GFP_KERNEL);
1395 if (!ddp) {
1396 pr_warn("cdev 0x%p, ddp ppmax %u OOM.\n", cdev, ppmax);
1397 return -ENOMEM;
1398 }
1399 ddp->gl_map = (struct cxgbi_gather_list **)(ddp + 1);
1400 cdev->ddp = ddp;
1401
1402 spin_lock_init(&ddp->map_lock);
1403 kref_init(&ddp->refcnt);
1404
1405 ddp->cdev = cdev;
1406 ddp->pdev = cdev->pdev;
1407 ddp->llimit = llimit;
1408 ddp->ulimit = ulimit;
1409 ddp->max_txsz = min_t(unsigned int, max_txsz, ULP2_MAX_PKT_SIZE);
1410 ddp->max_rxsz = min_t(unsigned int, max_rxsz, ULP2_MAX_PKT_SIZE);
1411 ddp->nppods = ppmax;
1412 ddp->idx_last = ppmax;
1413 ddp->idx_bits = bits;
1414 ddp->idx_mask = (1 << bits) - 1;
1415 ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1;
1416
1417 cdev->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
1418 cdev->tag_format.rsvd_bits = ddp->idx_bits;
1419 cdev->tag_format.rsvd_shift = PPOD_IDX_SHIFT;
1420 cdev->tag_format.rsvd_mask = (1 << cdev->tag_format.rsvd_bits) - 1;
1421
1422 pr_info("%s tag format, sw %u, rsvd %u,%u, mask 0x%x.\n",
1423 cdev->ports[0]->name, cdev->tag_format.sw_bits,
1424 cdev->tag_format.rsvd_bits, cdev->tag_format.rsvd_shift,
1425 cdev->tag_format.rsvd_mask);
1426
1427 cdev->tx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1428 ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
1429 cdev->rx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1430 ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);
1431
1432 log_debug(1 << CXGBI_DBG_DDP,
1433 "%s max payload size: %u/%u, %u/%u.\n",
1434 cdev->ports[0]->name, cdev->tx_max_size, ddp->max_txsz,
1435 cdev->rx_max_size, ddp->max_rxsz);
1436 return 0;
1437 }
1438 EXPORT_SYMBOL_GPL(cxgbi_ddp_init);
1439
1440 /*
1441 * APIs interacting with open-iscsi libraries
1442 */
1443
1444 static unsigned char padding[4];
1445
1446 static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1447 {
1448 struct scsi_cmnd *sc = task->sc;
1449 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1450 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1451 struct cxgbi_hba *chba = cconn->chba;
1452 struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1453 u32 tag = ntohl((__force u32)hdr_itt);
1454
1455 log_debug(1 << CXGBI_DBG_DDP,
1456 "cdev 0x%p, release tag 0x%x.\n", chba->cdev, tag);
1457 if (sc &&
1458 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
1459 cxgbi_is_ddp_tag(tformat, tag))
1460 ddp_tag_release(chba, tag);
1461 }
1462
1463 static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1464 {
1465 struct scsi_cmnd *sc = task->sc;
1466 struct iscsi_conn *conn = task->conn;
1467 struct iscsi_session *sess = conn->session;
1468 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1469 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1470 struct cxgbi_hba *chba = cconn->chba;
1471 struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1472 u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
1473 u32 tag = 0;
1474 int err = -EINVAL;
1475
1476 if (sc &&
1477 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)) {
1478 err = cxgbi_ddp_reserve(cconn->cep->csk, &tag, sw_tag,
1479 scsi_in(sc)->length,
1480 scsi_in(sc)->table.sgl,
1481 scsi_in(sc)->table.nents,
1482 GFP_ATOMIC);
1483 if (err < 0)
1484 log_debug(1 << CXGBI_DBG_DDP,
1485 "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1486 cconn->cep->csk, task, scsi_in(sc)->length,
1487 scsi_in(sc)->table.nents);
1488 }
1489
1490 if (err < 0)
1491 tag = cxgbi_set_non_ddp_tag(tformat, sw_tag);
1492 /* the itt need to sent in big-endian order */
1493 *hdr_itt = (__force itt_t)htonl(tag);
1494
1495 log_debug(1 << CXGBI_DBG_DDP,
1496 "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1497 chba->cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1498 return 0;
1499 }
1500
1501 void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1502 {
1503 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1504 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1505 struct cxgbi_device *cdev = cconn->chba->cdev;
1506 u32 tag = ntohl((__force u32) itt);
1507 u32 sw_bits;
1508
1509 sw_bits = cxgbi_tag_nonrsvd_bits(&cdev->tag_format, tag);
1510 if (idx)
1511 *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
1512 if (age)
1513 *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
1514
1515 log_debug(1 << CXGBI_DBG_DDP,
1516 "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1517 cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1518 age ? *age : 0xFF);
1519 }
1520 EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1521
1522 void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1523 {
1524 struct iscsi_conn *conn = csk->user_data;
1525
1526 if (conn) {
1527 log_debug(1 << CXGBI_DBG_SOCK,
1528 "csk 0x%p, cid %d.\n", csk, conn->id);
1529 iscsi_conn_queue_work(conn);
1530 }
1531 }
1532 EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1533
1534 /*
1535 * pdu receive, interact with libiscsi_tcp
1536 */
1537 static inline int read_pdu_skb(struct iscsi_conn *conn,
1538 struct sk_buff *skb,
1539 unsigned int offset,
1540 int offloaded)
1541 {
1542 int status = 0;
1543 int bytes_read;
1544
1545 bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1546 switch (status) {
1547 case ISCSI_TCP_CONN_ERR:
1548 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1549 skb, offset, offloaded);
1550 return -EIO;
1551 case ISCSI_TCP_SUSPENDED:
1552 log_debug(1 << CXGBI_DBG_PDU_RX,
1553 "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1554 skb, offset, offloaded, bytes_read);
1555 /* no transfer - just have caller flush queue */
1556 return bytes_read;
1557 case ISCSI_TCP_SKB_DONE:
1558 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1559 skb, offset, offloaded);
1560 /*
1561 * pdus should always fit in the skb and we should get
1562 * segment done notifcation.
1563 */
1564 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1565 return -EFAULT;
1566 case ISCSI_TCP_SEGMENT_DONE:
1567 log_debug(1 << CXGBI_DBG_PDU_RX,
1568 "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1569 skb, offset, offloaded, bytes_read);
1570 return bytes_read;
1571 default:
1572 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1573 skb, offset, offloaded, status);
1574 return -EINVAL;
1575 }
1576 }
1577
1578 static int skb_read_pdu_bhs(struct iscsi_conn *conn, struct sk_buff *skb)
1579 {
1580 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1581
1582 log_debug(1 << CXGBI_DBG_PDU_RX,
1583 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1584 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1585
1586 if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1587 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1588 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1589 return -EIO;
1590 }
1591
1592 if (conn->hdrdgst_en &&
1593 cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1594 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1595 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1596 return -EIO;
1597 }
1598
1599 return read_pdu_skb(conn, skb, 0, 0);
1600 }
1601
1602 static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1603 struct sk_buff *skb, unsigned int offset)
1604 {
1605 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1606 bool offloaded = 0;
1607 int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1608
1609 log_debug(1 << CXGBI_DBG_PDU_RX,
1610 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1611 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1612
1613 if (conn->datadgst_en &&
1614 cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1615 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1616 conn, lskb, cxgbi_skcb_flags(lskb));
1617 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1618 return -EIO;
1619 }
1620
1621 if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1622 return 0;
1623
1624 /* coalesced, add header digest length */
1625 if (lskb == skb && conn->hdrdgst_en)
1626 offset += ISCSI_DIGEST_SIZE;
1627
1628 if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1629 offloaded = 1;
1630
1631 if (opcode == ISCSI_OP_SCSI_DATA_IN)
1632 log_debug(1 << CXGBI_DBG_PDU_RX,
1633 "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1634 skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1635 tcp_conn->in.datalen, offloaded ? "is" : "not");
1636
1637 return read_pdu_skb(conn, skb, offset, offloaded);
1638 }
1639
1640 static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1641 {
1642 struct cxgbi_device *cdev = csk->cdev;
1643 int must_send;
1644 u32 credits;
1645
1646 log_debug(1 << CXGBI_DBG_PDU_RX,
1647 "csk 0x%p,%u,0x%lu,%u, seq %u, wup %u, thre %u, %u.\n",
1648 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1649 csk->rcv_wup, cdev->rx_credit_thres,
1650 cdev->rcv_win);
1651
1652 if (csk->state != CTP_ESTABLISHED)
1653 return;
1654
1655 credits = csk->copied_seq - csk->rcv_wup;
1656 if (unlikely(!credits))
1657 return;
1658 if (unlikely(cdev->rx_credit_thres == 0))
1659 return;
1660
1661 must_send = credits + 16384 >= cdev->rcv_win;
1662 if (must_send || credits >= cdev->rx_credit_thres)
1663 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1664 }
1665
1666 void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1667 {
1668 struct cxgbi_device *cdev = csk->cdev;
1669 struct iscsi_conn *conn = csk->user_data;
1670 struct sk_buff *skb;
1671 unsigned int read = 0;
1672 int err = 0;
1673
1674 log_debug(1 << CXGBI_DBG_PDU_RX,
1675 "csk 0x%p, conn 0x%p.\n", csk, conn);
1676
1677 if (unlikely(!conn || conn->suspend_rx)) {
1678 log_debug(1 << CXGBI_DBG_PDU_RX,
1679 "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1680 csk, conn, conn ? conn->id : 0xFF,
1681 conn ? conn->suspend_rx : 0xFF);
1682 return;
1683 }
1684
1685 while (!err) {
1686 skb = skb_peek(&csk->receive_queue);
1687 if (!skb ||
1688 !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1689 if (skb)
1690 log_debug(1 << CXGBI_DBG_PDU_RX,
1691 "skb 0x%p, NOT ready 0x%lx.\n",
1692 skb, cxgbi_skcb_flags(skb));
1693 break;
1694 }
1695 __skb_unlink(skb, &csk->receive_queue);
1696
1697 read += cxgbi_skcb_rx_pdulen(skb);
1698 log_debug(1 << CXGBI_DBG_PDU_RX,
1699 "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1700 csk, skb, skb->len, cxgbi_skcb_flags(skb),
1701 cxgbi_skcb_rx_pdulen(skb));
1702
1703 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1704 err = skb_read_pdu_bhs(conn, skb);
1705 if (err < 0) {
1706 pr_err("coalesced bhs, 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 goto skb_done;
1712 }
1713 err = skb_read_pdu_data(conn, skb, skb,
1714 err + cdev->skb_rx_extra);
1715 if (err < 0)
1716 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1717 "f 0x%lx, plen %u.\n",
1718 csk, skb, skb->len,
1719 cxgbi_skcb_flags(skb),
1720 cxgbi_skcb_rx_pdulen(skb));
1721 } else {
1722 err = skb_read_pdu_bhs(conn, skb);
1723 if (err < 0) {
1724 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1725 "f 0x%lx, plen %u.\n",
1726 csk, skb, skb->len,
1727 cxgbi_skcb_flags(skb),
1728 cxgbi_skcb_rx_pdulen(skb));
1729 goto skb_done;
1730 }
1731
1732 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1733 struct sk_buff *dskb;
1734
1735 dskb = skb_peek(&csk->receive_queue);
1736 if (!dskb) {
1737 pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1738 " plen %u, NO data.\n",
1739 csk, skb, skb->len,
1740 cxgbi_skcb_flags(skb),
1741 cxgbi_skcb_rx_pdulen(skb));
1742 err = -EIO;
1743 goto skb_done;
1744 }
1745 __skb_unlink(dskb, &csk->receive_queue);
1746
1747 err = skb_read_pdu_data(conn, skb, dskb, 0);
1748 if (err < 0)
1749 pr_err("data, csk 0x%p, skb 0x%p,%u, "
1750 "f 0x%lx, plen %u, dskb 0x%p,"
1751 "%u.\n",
1752 csk, skb, skb->len,
1753 cxgbi_skcb_flags(skb),
1754 cxgbi_skcb_rx_pdulen(skb),
1755 dskb, dskb->len);
1756 __kfree_skb(dskb);
1757 } else
1758 err = skb_read_pdu_data(conn, skb, skb, 0);
1759 }
1760 skb_done:
1761 __kfree_skb(skb);
1762
1763 if (err < 0)
1764 break;
1765 }
1766
1767 log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
1768 if (read) {
1769 csk->copied_seq += read;
1770 csk_return_rx_credits(csk, read);
1771 conn->rxdata_octets += read;
1772 }
1773
1774 if (err < 0) {
1775 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
1776 csk, conn, err, read);
1777 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1778 }
1779 }
1780 EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
1781
1782 static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
1783 unsigned int offset, unsigned int *off,
1784 struct scatterlist **sgp)
1785 {
1786 int i;
1787 struct scatterlist *sg;
1788
1789 for_each_sg(sgl, sg, sgcnt, i) {
1790 if (offset < sg->length) {
1791 *off = offset;
1792 *sgp = sg;
1793 return 0;
1794 }
1795 offset -= sg->length;
1796 }
1797 return -EFAULT;
1798 }
1799
1800 static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
1801 unsigned int dlen, struct page_frag *frags,
1802 int frag_max)
1803 {
1804 unsigned int datalen = dlen;
1805 unsigned int sglen = sg->length - sgoffset;
1806 struct page *page = sg_page(sg);
1807 int i;
1808
1809 i = 0;
1810 do {
1811 unsigned int copy;
1812
1813 if (!sglen) {
1814 sg = sg_next(sg);
1815 if (!sg) {
1816 pr_warn("sg %d NULL, len %u/%u.\n",
1817 i, datalen, dlen);
1818 return -EINVAL;
1819 }
1820 sgoffset = 0;
1821 sglen = sg->length;
1822 page = sg_page(sg);
1823
1824 }
1825 copy = min(datalen, sglen);
1826 if (i && page == frags[i - 1].page &&
1827 sgoffset + sg->offset ==
1828 frags[i - 1].offset + frags[i - 1].size) {
1829 frags[i - 1].size += copy;
1830 } else {
1831 if (i >= frag_max) {
1832 pr_warn("too many pages %u, dlen %u.\n",
1833 frag_max, dlen);
1834 return -EINVAL;
1835 }
1836
1837 frags[i].page = page;
1838 frags[i].offset = sg->offset + sgoffset;
1839 frags[i].size = copy;
1840 i++;
1841 }
1842 datalen -= copy;
1843 sgoffset += copy;
1844 sglen -= copy;
1845 } while (datalen);
1846
1847 return i;
1848 }
1849
1850 int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
1851 {
1852 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1853 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1854 struct cxgbi_device *cdev = cconn->chba->cdev;
1855 struct iscsi_conn *conn = task->conn;
1856 struct iscsi_tcp_task *tcp_task = task->dd_data;
1857 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1858 struct scsi_cmnd *sc = task->sc;
1859 int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
1860
1861 tcp_task->dd_data = tdata;
1862 task->hdr = NULL;
1863
1864 if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
1865 (opcode == ISCSI_OP_SCSI_DATA_OUT ||
1866 (opcode == ISCSI_OP_SCSI_CMD &&
1867 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
1868 /* data could goes into skb head */
1869 headroom += min_t(unsigned int,
1870 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
1871 conn->max_xmit_dlength);
1872
1873 tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
1874 if (!tdata->skb) {
1875 struct cxgbi_sock *csk = cconn->cep->csk;
1876 struct net_device *ndev = cdev->ports[csk->port_id];
1877 ndev->stats.tx_dropped++;
1878 return -ENOMEM;
1879 }
1880
1881 skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
1882 task->hdr = (struct iscsi_hdr *)tdata->skb->data;
1883 task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
1884
1885 /* data_out uses scsi_cmd's itt */
1886 if (opcode != ISCSI_OP_SCSI_DATA_OUT)
1887 task_reserve_itt(task, &task->hdr->itt);
1888
1889 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1890 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
1891 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
1892 conn->max_xmit_dlength, ntohl(task->hdr->itt));
1893
1894 return 0;
1895 }
1896 EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
1897
1898 static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
1899 {
1900 if (hcrc || dcrc) {
1901 u8 submode = 0;
1902
1903 if (hcrc)
1904 submode |= 1;
1905 if (dcrc)
1906 submode |= 2;
1907 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
1908 } else
1909 cxgbi_skcb_ulp_mode(skb) = 0;
1910 }
1911
1912 int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
1913 unsigned int count)
1914 {
1915 struct iscsi_conn *conn = task->conn;
1916 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1917 struct sk_buff *skb = tdata->skb;
1918 unsigned int datalen = count;
1919 int i, padlen = iscsi_padding(count);
1920 struct page *pg;
1921
1922 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1923 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
1924 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
1925 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
1926
1927 skb_put(skb, task->hdr_len);
1928 tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
1929 if (!count)
1930 return 0;
1931
1932 if (task->sc) {
1933 struct scsi_data_buffer *sdb = scsi_out(task->sc);
1934 struct scatterlist *sg = NULL;
1935 int err;
1936
1937 tdata->offset = offset;
1938 tdata->count = count;
1939 err = sgl_seek_offset(
1940 sdb->table.sgl, sdb->table.nents,
1941 tdata->offset, &tdata->sgoffset, &sg);
1942 if (err < 0) {
1943 pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
1944 sdb->table.nents, tdata->offset, sdb->length);
1945 return err;
1946 }
1947 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
1948 tdata->frags, MAX_PDU_FRAGS);
1949 if (err < 0) {
1950 pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
1951 sdb->table.nents, tdata->offset, tdata->count);
1952 return err;
1953 }
1954 tdata->nr_frags = err;
1955
1956 if (tdata->nr_frags > MAX_SKB_FRAGS ||
1957 (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
1958 char *dst = skb->data + task->hdr_len;
1959 struct page_frag *frag = tdata->frags;
1960
1961 /* data fits in the skb's headroom */
1962 for (i = 0; i < tdata->nr_frags; i++, frag++) {
1963 char *src = kmap_atomic(frag->page);
1964
1965 memcpy(dst, src+frag->offset, frag->size);
1966 dst += frag->size;
1967 kunmap_atomic(src);
1968 }
1969 if (padlen) {
1970 memset(dst, 0, padlen);
1971 padlen = 0;
1972 }
1973 skb_put(skb, count + padlen);
1974 } else {
1975 /* data fit into frag_list */
1976 for (i = 0; i < tdata->nr_frags; i++) {
1977 __skb_fill_page_desc(skb, i,
1978 tdata->frags[i].page,
1979 tdata->frags[i].offset,
1980 tdata->frags[i].size);
1981 skb_frag_ref(skb, i);
1982 }
1983 skb_shinfo(skb)->nr_frags = tdata->nr_frags;
1984 skb->len += count;
1985 skb->data_len += count;
1986 skb->truesize += count;
1987 }
1988
1989 } else {
1990 pg = virt_to_page(task->data);
1991
1992 get_page(pg);
1993 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
1994 count);
1995 skb->len += count;
1996 skb->data_len += count;
1997 skb->truesize += count;
1998 }
1999
2000 if (padlen) {
2001 i = skb_shinfo(skb)->nr_frags;
2002 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
2003 virt_to_page(padding), offset_in_page(padding),
2004 padlen);
2005
2006 skb->data_len += padlen;
2007 skb->truesize += padlen;
2008 skb->len += padlen;
2009 }
2010
2011 return 0;
2012 }
2013 EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
2014
2015 int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2016 {
2017 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2018 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2019 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2020 struct sk_buff *skb = tdata->skb;
2021 unsigned int datalen;
2022 int err;
2023
2024 if (!skb) {
2025 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2026 "task 0x%p, skb NULL.\n", task);
2027 return 0;
2028 }
2029
2030 datalen = skb->data_len;
2031 tdata->skb = NULL;
2032 err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2033 if (err > 0) {
2034 int pdulen = err;
2035
2036 log_debug(1 << CXGBI_DBG_PDU_TX,
2037 "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2038 task, task->sc, skb, skb->len, skb->data_len, err);
2039
2040 if (task->conn->hdrdgst_en)
2041 pdulen += ISCSI_DIGEST_SIZE;
2042
2043 if (datalen && task->conn->datadgst_en)
2044 pdulen += ISCSI_DIGEST_SIZE;
2045
2046 task->conn->txdata_octets += pdulen;
2047 return 0;
2048 }
2049
2050 if (err == -EAGAIN || err == -ENOBUFS) {
2051 log_debug(1 << CXGBI_DBG_PDU_TX,
2052 "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2053 task, skb, skb->len, skb->data_len, err);
2054 /* reset skb to send when we are called again */
2055 tdata->skb = skb;
2056 return err;
2057 }
2058
2059 kfree_skb(skb);
2060 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2061 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2062 task->itt, skb, skb->len, skb->data_len, err);
2063 iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2064 iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2065 return err;
2066 }
2067 EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2068
2069 void cxgbi_cleanup_task(struct iscsi_task *task)
2070 {
2071 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2072
2073 log_debug(1 << CXGBI_DBG_ISCSI,
2074 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2075 task, tdata->skb, task->hdr_itt);
2076
2077 /* never reached the xmit task callout */
2078 if (tdata->skb)
2079 __kfree_skb(tdata->skb);
2080 memset(tdata, 0, sizeof(*tdata));
2081
2082 task_release_itt(task, task->hdr_itt);
2083 iscsi_tcp_cleanup_task(task);
2084 }
2085 EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2086
2087 void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2088 struct iscsi_stats *stats)
2089 {
2090 struct iscsi_conn *conn = cls_conn->dd_data;
2091
2092 stats->txdata_octets = conn->txdata_octets;
2093 stats->rxdata_octets = conn->rxdata_octets;
2094 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2095 stats->dataout_pdus = conn->dataout_pdus_cnt;
2096 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2097 stats->datain_pdus = conn->datain_pdus_cnt;
2098 stats->r2t_pdus = conn->r2t_pdus_cnt;
2099 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2100 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2101 stats->digest_err = 0;
2102 stats->timeout_err = 0;
2103 stats->custom_length = 1;
2104 strcpy(stats->custom[0].desc, "eh_abort_cnt");
2105 stats->custom[0].value = conn->eh_abort_cnt;
2106 }
2107 EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2108
2109 static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2110 {
2111 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2112 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2113 struct cxgbi_device *cdev = cconn->chba->cdev;
2114 unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2115 unsigned int max_def = 512 * MAX_SKB_FRAGS;
2116 unsigned int max = max(max_def, headroom);
2117
2118 max = min(cconn->chba->cdev->tx_max_size, max);
2119 if (conn->max_xmit_dlength)
2120 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2121 else
2122 conn->max_xmit_dlength = max;
2123 cxgbi_align_pdu_size(conn->max_xmit_dlength);
2124
2125 return 0;
2126 }
2127
2128 static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2129 {
2130 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2131 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2132 unsigned int max = cconn->chba->cdev->rx_max_size;
2133
2134 cxgbi_align_pdu_size(max);
2135
2136 if (conn->max_recv_dlength) {
2137 if (conn->max_recv_dlength > max) {
2138 pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2139 conn->max_recv_dlength, max);
2140 return -EINVAL;
2141 }
2142 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2143 cxgbi_align_pdu_size(conn->max_recv_dlength);
2144 } else
2145 conn->max_recv_dlength = max;
2146
2147 return 0;
2148 }
2149
2150 int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2151 enum iscsi_param param, char *buf, int buflen)
2152 {
2153 struct iscsi_conn *conn = cls_conn->dd_data;
2154 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2155 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2156 struct cxgbi_sock *csk = cconn->cep->csk;
2157 int err;
2158
2159 log_debug(1 << CXGBI_DBG_ISCSI,
2160 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2161 cls_conn, param, buflen, buf);
2162
2163 switch (param) {
2164 case ISCSI_PARAM_HDRDGST_EN:
2165 err = iscsi_set_param(cls_conn, param, buf, buflen);
2166 if (!err && conn->hdrdgst_en)
2167 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2168 conn->hdrdgst_en,
2169 conn->datadgst_en, 0);
2170 break;
2171 case ISCSI_PARAM_DATADGST_EN:
2172 err = iscsi_set_param(cls_conn, param, buf, buflen);
2173 if (!err && conn->datadgst_en)
2174 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2175 conn->hdrdgst_en,
2176 conn->datadgst_en, 0);
2177 break;
2178 case ISCSI_PARAM_MAX_R2T:
2179 return iscsi_tcp_set_max_r2t(conn, buf);
2180 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2181 err = iscsi_set_param(cls_conn, param, buf, buflen);
2182 if (!err)
2183 err = cxgbi_conn_max_recv_dlength(conn);
2184 break;
2185 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2186 err = iscsi_set_param(cls_conn, param, buf, buflen);
2187 if (!err)
2188 err = cxgbi_conn_max_xmit_dlength(conn);
2189 break;
2190 default:
2191 return iscsi_set_param(cls_conn, param, buf, buflen);
2192 }
2193 return err;
2194 }
2195 EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2196
2197 int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2198 char *buf)
2199 {
2200 struct cxgbi_endpoint *cep = ep->dd_data;
2201 struct cxgbi_sock *csk;
2202 int len;
2203
2204 log_debug(1 << CXGBI_DBG_ISCSI,
2205 "cls_conn 0x%p, param %d.\n", ep, param);
2206
2207 switch (param) {
2208 case ISCSI_PARAM_CONN_PORT:
2209 case ISCSI_PARAM_CONN_ADDRESS:
2210 if (!cep)
2211 return -ENOTCONN;
2212
2213 csk = cep->csk;
2214 if (!csk)
2215 return -ENOTCONN;
2216
2217 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2218 &csk->daddr, param, buf);
2219 default:
2220 return -ENOSYS;
2221 }
2222 return len;
2223 }
2224 EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
2225
2226 struct iscsi_cls_conn *
2227 cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2228 {
2229 struct iscsi_cls_conn *cls_conn;
2230 struct iscsi_conn *conn;
2231 struct iscsi_tcp_conn *tcp_conn;
2232 struct cxgbi_conn *cconn;
2233
2234 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2235 if (!cls_conn)
2236 return NULL;
2237
2238 conn = cls_conn->dd_data;
2239 tcp_conn = conn->dd_data;
2240 cconn = tcp_conn->dd_data;
2241 cconn->iconn = conn;
2242
2243 log_debug(1 << CXGBI_DBG_ISCSI,
2244 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2245 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2246
2247 return cls_conn;
2248 }
2249 EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2250
2251 int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2252 struct iscsi_cls_conn *cls_conn,
2253 u64 transport_eph, int is_leading)
2254 {
2255 struct iscsi_conn *conn = cls_conn->dd_data;
2256 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2257 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2258 struct iscsi_endpoint *ep;
2259 struct cxgbi_endpoint *cep;
2260 struct cxgbi_sock *csk;
2261 int err;
2262
2263 ep = iscsi_lookup_endpoint(transport_eph);
2264 if (!ep)
2265 return -EINVAL;
2266
2267 /* setup ddp pagesize */
2268 cep = ep->dd_data;
2269 csk = cep->csk;
2270 err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid, page_idx, 0);
2271 if (err < 0)
2272 return err;
2273
2274 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2275 if (err)
2276 return -EINVAL;
2277
2278 /* calculate the tag idx bits needed for this conn based on cmds_max */
2279 cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2280
2281 write_lock_bh(&csk->callback_lock);
2282 csk->user_data = conn;
2283 cconn->chba = cep->chba;
2284 cconn->cep = cep;
2285 cep->cconn = cconn;
2286 write_unlock_bh(&csk->callback_lock);
2287
2288 cxgbi_conn_max_xmit_dlength(conn);
2289 cxgbi_conn_max_recv_dlength(conn);
2290
2291 log_debug(1 << CXGBI_DBG_ISCSI,
2292 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2293 cls_session, cls_conn, ep, cconn, csk);
2294 /* init recv engine */
2295 iscsi_tcp_hdr_recv_prep(tcp_conn);
2296
2297 return 0;
2298 }
2299 EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2300
2301 struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2302 u16 cmds_max, u16 qdepth,
2303 u32 initial_cmdsn)
2304 {
2305 struct cxgbi_endpoint *cep;
2306 struct cxgbi_hba *chba;
2307 struct Scsi_Host *shost;
2308 struct iscsi_cls_session *cls_session;
2309 struct iscsi_session *session;
2310
2311 if (!ep) {
2312 pr_err("missing endpoint.\n");
2313 return NULL;
2314 }
2315
2316 cep = ep->dd_data;
2317 chba = cep->chba;
2318 shost = chba->shost;
2319
2320 BUG_ON(chba != iscsi_host_priv(shost));
2321
2322 cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2323 cmds_max, 0,
2324 sizeof(struct iscsi_tcp_task) +
2325 sizeof(struct cxgbi_task_data),
2326 initial_cmdsn, ISCSI_MAX_TARGET);
2327 if (!cls_session)
2328 return NULL;
2329
2330 session = cls_session->dd_data;
2331 if (iscsi_tcp_r2tpool_alloc(session))
2332 goto remove_session;
2333
2334 log_debug(1 << CXGBI_DBG_ISCSI,
2335 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2336 return cls_session;
2337
2338 remove_session:
2339 iscsi_session_teardown(cls_session);
2340 return NULL;
2341 }
2342 EXPORT_SYMBOL_GPL(cxgbi_create_session);
2343
2344 void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2345 {
2346 log_debug(1 << CXGBI_DBG_ISCSI,
2347 "cls sess 0x%p.\n", cls_session);
2348
2349 iscsi_tcp_r2tpool_free(cls_session->dd_data);
2350 iscsi_session_teardown(cls_session);
2351 }
2352 EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2353
2354 int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2355 char *buf, int buflen)
2356 {
2357 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2358
2359 if (!chba->ndev) {
2360 shost_printk(KERN_ERR, shost, "Could not get host param. "
2361 "netdev for host not set.\n");
2362 return -ENODEV;
2363 }
2364
2365 log_debug(1 << CXGBI_DBG_ISCSI,
2366 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2367 shost, chba, chba->ndev->name, param, buflen, buf);
2368
2369 switch (param) {
2370 case ISCSI_HOST_PARAM_IPADDRESS:
2371 {
2372 __be32 addr = in_aton(buf);
2373 log_debug(1 << CXGBI_DBG_ISCSI,
2374 "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2375 cxgbi_set_iscsi_ipv4(chba, addr);
2376 return 0;
2377 }
2378 case ISCSI_HOST_PARAM_HWADDRESS:
2379 case ISCSI_HOST_PARAM_NETDEV_NAME:
2380 return 0;
2381 default:
2382 return iscsi_host_set_param(shost, param, buf, buflen);
2383 }
2384 }
2385 EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2386
2387 int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2388 char *buf)
2389 {
2390 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2391 int len = 0;
2392
2393 if (!chba->ndev) {
2394 shost_printk(KERN_ERR, shost, "Could not get host param. "
2395 "netdev for host not set.\n");
2396 return -ENODEV;
2397 }
2398
2399 log_debug(1 << CXGBI_DBG_ISCSI,
2400 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2401 shost, chba, chba->ndev->name, param);
2402
2403 switch (param) {
2404 case ISCSI_HOST_PARAM_HWADDRESS:
2405 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2406 break;
2407 case ISCSI_HOST_PARAM_NETDEV_NAME:
2408 len = sprintf(buf, "%s\n", chba->ndev->name);
2409 break;
2410 case ISCSI_HOST_PARAM_IPADDRESS:
2411 {
2412 __be32 addr;
2413
2414 addr = cxgbi_get_iscsi_ipv4(chba);
2415 len = sprintf(buf, "%pI4", &addr);
2416 log_debug(1 << CXGBI_DBG_ISCSI,
2417 "hba %s, ipv4 %pI4.\n", chba->ndev->name, &addr);
2418 break;
2419 }
2420 default:
2421 return iscsi_host_get_param(shost, param, buf);
2422 }
2423
2424 return len;
2425 }
2426 EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2427
2428 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2429 struct sockaddr *dst_addr,
2430 int non_blocking)
2431 {
2432 struct iscsi_endpoint *ep;
2433 struct cxgbi_endpoint *cep;
2434 struct cxgbi_hba *hba = NULL;
2435 struct cxgbi_sock *csk;
2436 int err = -EINVAL;
2437
2438 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2439 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2440 shost, non_blocking, dst_addr);
2441
2442 if (shost) {
2443 hba = iscsi_host_priv(shost);
2444 if (!hba) {
2445 pr_info("shost 0x%p, priv NULL.\n", shost);
2446 goto err_out;
2447 }
2448 }
2449
2450 csk = cxgbi_check_route(dst_addr);
2451 if (IS_ERR(csk))
2452 return (struct iscsi_endpoint *)csk;
2453 cxgbi_sock_get(csk);
2454
2455 if (!hba)
2456 hba = csk->cdev->hbas[csk->port_id];
2457 else if (hba != csk->cdev->hbas[csk->port_id]) {
2458 pr_info("Could not connect through requested host %u"
2459 "hba 0x%p != 0x%p (%u).\n",
2460 shost->host_no, hba,
2461 csk->cdev->hbas[csk->port_id], csk->port_id);
2462 err = -ENOSPC;
2463 goto release_conn;
2464 }
2465
2466 err = sock_get_port(csk);
2467 if (err)
2468 goto release_conn;
2469
2470 cxgbi_sock_set_state(csk, CTP_CONNECTING);
2471 err = csk->cdev->csk_init_act_open(csk);
2472 if (err)
2473 goto release_conn;
2474
2475 if (cxgbi_sock_is_closing(csk)) {
2476 err = -ENOSPC;
2477 pr_info("csk 0x%p is closing.\n", csk);
2478 goto release_conn;
2479 }
2480
2481 ep = iscsi_create_endpoint(sizeof(*cep));
2482 if (!ep) {
2483 err = -ENOMEM;
2484 pr_info("iscsi alloc ep, OOM.\n");
2485 goto release_conn;
2486 }
2487
2488 cep = ep->dd_data;
2489 cep->csk = csk;
2490 cep->chba = hba;
2491
2492 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2493 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2494 ep, cep, csk, hba, hba->ndev->name);
2495 return ep;
2496
2497 release_conn:
2498 cxgbi_sock_put(csk);
2499 cxgbi_sock_closed(csk);
2500 err_out:
2501 return ERR_PTR(err);
2502 }
2503 EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2504
2505 int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2506 {
2507 struct cxgbi_endpoint *cep = ep->dd_data;
2508 struct cxgbi_sock *csk = cep->csk;
2509
2510 if (!cxgbi_sock_is_established(csk))
2511 return 0;
2512 return 1;
2513 }
2514 EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2515
2516 void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2517 {
2518 struct cxgbi_endpoint *cep = ep->dd_data;
2519 struct cxgbi_conn *cconn = cep->cconn;
2520 struct cxgbi_sock *csk = cep->csk;
2521
2522 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2523 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2524 ep, cep, cconn, csk, csk->state, csk->flags);
2525
2526 if (cconn && cconn->iconn) {
2527 iscsi_suspend_tx(cconn->iconn);
2528 write_lock_bh(&csk->callback_lock);
2529 cep->csk->user_data = NULL;
2530 cconn->cep = NULL;
2531 write_unlock_bh(&csk->callback_lock);
2532 }
2533 iscsi_destroy_endpoint(ep);
2534
2535 if (likely(csk->state >= CTP_ESTABLISHED))
2536 need_active_close(csk);
2537 else
2538 cxgbi_sock_closed(csk);
2539
2540 cxgbi_sock_put(csk);
2541 }
2542 EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2543
2544 int cxgbi_iscsi_init(struct iscsi_transport *itp,
2545 struct scsi_transport_template **stt)
2546 {
2547 *stt = iscsi_register_transport(itp);
2548 if (*stt == NULL) {
2549 pr_err("unable to register %s transport 0x%p.\n",
2550 itp->name, itp);
2551 return -ENODEV;
2552 }
2553 log_debug(1 << CXGBI_DBG_ISCSI,
2554 "%s, registered iscsi transport 0x%p.\n",
2555 itp->name, stt);
2556 return 0;
2557 }
2558 EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2559
2560 void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2561 struct scsi_transport_template **stt)
2562 {
2563 if (*stt) {
2564 log_debug(1 << CXGBI_DBG_ISCSI,
2565 "de-register transport 0x%p, %s, stt 0x%p.\n",
2566 itp, itp->name, *stt);
2567 *stt = NULL;
2568 iscsi_unregister_transport(itp);
2569 }
2570 }
2571 EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2572
2573 umode_t cxgbi_attr_is_visible(int param_type, int param)
2574 {
2575 switch (param_type) {
2576 case ISCSI_HOST_PARAM:
2577 switch (param) {
2578 case ISCSI_HOST_PARAM_NETDEV_NAME:
2579 case ISCSI_HOST_PARAM_HWADDRESS:
2580 case ISCSI_HOST_PARAM_IPADDRESS:
2581 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2582 return S_IRUGO;
2583 default:
2584 return 0;
2585 }
2586 case ISCSI_PARAM:
2587 switch (param) {
2588 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2589 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2590 case ISCSI_PARAM_HDRDGST_EN:
2591 case ISCSI_PARAM_DATADGST_EN:
2592 case ISCSI_PARAM_CONN_ADDRESS:
2593 case ISCSI_PARAM_CONN_PORT:
2594 case ISCSI_PARAM_EXP_STATSN:
2595 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2596 case ISCSI_PARAM_PERSISTENT_PORT:
2597 case ISCSI_PARAM_PING_TMO:
2598 case ISCSI_PARAM_RECV_TMO:
2599 case ISCSI_PARAM_INITIAL_R2T_EN:
2600 case ISCSI_PARAM_MAX_R2T:
2601 case ISCSI_PARAM_IMM_DATA_EN:
2602 case ISCSI_PARAM_FIRST_BURST:
2603 case ISCSI_PARAM_MAX_BURST:
2604 case ISCSI_PARAM_PDU_INORDER_EN:
2605 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2606 case ISCSI_PARAM_ERL:
2607 case ISCSI_PARAM_TARGET_NAME:
2608 case ISCSI_PARAM_TPGT:
2609 case ISCSI_PARAM_USERNAME:
2610 case ISCSI_PARAM_PASSWORD:
2611 case ISCSI_PARAM_USERNAME_IN:
2612 case ISCSI_PARAM_PASSWORD_IN:
2613 case ISCSI_PARAM_FAST_ABORT:
2614 case ISCSI_PARAM_ABORT_TMO:
2615 case ISCSI_PARAM_LU_RESET_TMO:
2616 case ISCSI_PARAM_TGT_RESET_TMO:
2617 case ISCSI_PARAM_IFACE_NAME:
2618 case ISCSI_PARAM_INITIATOR_NAME:
2619 return S_IRUGO;
2620 default:
2621 return 0;
2622 }
2623 }
2624
2625 return 0;
2626 }
2627 EXPORT_SYMBOL_GPL(cxgbi_attr_is_visible);
2628
2629 static int __init libcxgbi_init_module(void)
2630 {
2631 sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
2632 sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
2633
2634 pr_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
2635 ISCSI_ITT_MASK, sw_tag_idx_bits,
2636 ISCSI_AGE_MASK, sw_tag_age_bits);
2637
2638 ddp_setup_host_page_size();
2639 return 0;
2640 }
2641
2642 static void __exit libcxgbi_exit_module(void)
2643 {
2644 cxgbi_device_unregister_all(0xFF);
2645 return;
2646 }
2647
2648 module_init(libcxgbi_init_module);
2649 module_exit(libcxgbi_exit_module);
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