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hwrng: core - Don't use a stack buffer in add_early_randomness()
[linux/fpc-iii.git] / drivers / scsi / cxgbi / libcxgbi.c
blobd1421139e6eac615d1e3ae2a9af1e02ee78d0822
1 /*
2 * libcxgbi.c: Chelsio common library for T3/T4 iSCSI driver.
3 *
4 * Copyright (c) 2010-2015 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 <net/ipv6.h>
28 #include <net/ip6_route.h>
29 #include <net/addrconf.h>
30
31 #include <linux/inetdevice.h> /* ip_dev_find */
32 #include <linux/module.h>
33 #include <net/tcp.h>
34
35 static unsigned int dbg_level;
36
37 #include "libcxgbi.h"
38
39 #define DRV_MODULE_NAME "libcxgbi"
40 #define DRV_MODULE_DESC "Chelsio iSCSI driver library"
41 #define DRV_MODULE_VERSION "0.9.1-ko"
42 #define DRV_MODULE_RELDATE "Apr. 2015"
43
44 static char version[] =
45 DRV_MODULE_DESC " " DRV_MODULE_NAME
46 " v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
47
48 MODULE_AUTHOR("Chelsio Communications, Inc.");
49 MODULE_DESCRIPTION(DRV_MODULE_DESC);
50 MODULE_VERSION(DRV_MODULE_VERSION);
51 MODULE_LICENSE("GPL");
52
53 module_param(dbg_level, uint, 0644);
54 MODULE_PARM_DESC(dbg_level, "libiscsi debug level (default=0)");
55
56
57 /*
58 * cxgbi device management
59 * maintains a list of the cxgbi devices
60 */
61 static LIST_HEAD(cdev_list);
62 static DEFINE_MUTEX(cdev_mutex);
63
64 static LIST_HEAD(cdev_rcu_list);
65 static DEFINE_SPINLOCK(cdev_rcu_lock);
66
67 static inline void cxgbi_decode_sw_tag(u32 sw_tag, int *idx, int *age)
68 {
69 if (age)
70 *age = sw_tag & 0x7FFF;
71 if (idx)
72 *idx = (sw_tag >> 16) & 0x7FFF;
73 }
74
75 int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
76 unsigned int max_conn)
77 {
78 struct cxgbi_ports_map *pmap = &cdev->pmap;
79
80 pmap->port_csk = cxgbi_alloc_big_mem(max_conn *
81 sizeof(struct cxgbi_sock *),
82 GFP_KERNEL);
83 if (!pmap->port_csk) {
84 pr_warn("cdev 0x%p, portmap OOM %u.\n", cdev, max_conn);
85 return -ENOMEM;
86 }
87
88 pmap->max_connect = max_conn;
89 pmap->sport_base = base;
90 spin_lock_init(&pmap->lock);
91 return 0;
92 }
93 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_create);
94
95 void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev)
96 {
97 struct cxgbi_ports_map *pmap = &cdev->pmap;
98 struct cxgbi_sock *csk;
99 int i;
100
101 for (i = 0; i < pmap->max_connect; i++) {
102 if (pmap->port_csk[i]) {
103 csk = pmap->port_csk[i];
104 pmap->port_csk[i] = NULL;
105 log_debug(1 << CXGBI_DBG_SOCK,
106 "csk 0x%p, cdev 0x%p, offload down.\n",
107 csk, cdev);
108 spin_lock_bh(&csk->lock);
109 cxgbi_sock_set_flag(csk, CTPF_OFFLOAD_DOWN);
110 cxgbi_sock_closed(csk);
111 spin_unlock_bh(&csk->lock);
112 cxgbi_sock_put(csk);
113 }
114 }
115 }
116 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_cleanup);
117
118 static inline void cxgbi_device_destroy(struct cxgbi_device *cdev)
119 {
120 log_debug(1 << CXGBI_DBG_DEV,
121 "cdev 0x%p, p# %u.\n", cdev, cdev->nports);
122 cxgbi_hbas_remove(cdev);
123 cxgbi_device_portmap_cleanup(cdev);
124 cxgbi_ppm_release(cdev->cdev2ppm(cdev));
125 if (cdev->pmap.max_connect)
126 cxgbi_free_big_mem(cdev->pmap.port_csk);
127 kfree(cdev);
128 }
129
130 struct cxgbi_device *cxgbi_device_register(unsigned int extra,
131 unsigned int nports)
132 {
133 struct cxgbi_device *cdev;
134
135 cdev = kzalloc(sizeof(*cdev) + extra + nports *
136 (sizeof(struct cxgbi_hba *) +
137 sizeof(struct net_device *)),
138 GFP_KERNEL);
139 if (!cdev) {
140 pr_warn("nport %d, OOM.\n", nports);
141 return NULL;
142 }
143 cdev->ports = (struct net_device **)(cdev + 1);
144 cdev->hbas = (struct cxgbi_hba **)(((char*)cdev->ports) + nports *
145 sizeof(struct net_device *));
146 if (extra)
147 cdev->dd_data = ((char *)cdev->hbas) +
148 nports * sizeof(struct cxgbi_hba *);
149 spin_lock_init(&cdev->pmap.lock);
150
151 mutex_lock(&cdev_mutex);
152 list_add_tail(&cdev->list_head, &cdev_list);
153 mutex_unlock(&cdev_mutex);
154
155 spin_lock(&cdev_rcu_lock);
156 list_add_tail_rcu(&cdev->rcu_node, &cdev_rcu_list);
157 spin_unlock(&cdev_rcu_lock);
158
159 log_debug(1 << CXGBI_DBG_DEV,
160 "cdev 0x%p, p# %u.\n", cdev, nports);
161 return cdev;
162 }
163 EXPORT_SYMBOL_GPL(cxgbi_device_register);
164
165 void cxgbi_device_unregister(struct cxgbi_device *cdev)
166 {
167 log_debug(1 << CXGBI_DBG_DEV,
168 "cdev 0x%p, p# %u,%s.\n",
169 cdev, cdev->nports, cdev->nports ? cdev->ports[0]->name : "");
170
171 mutex_lock(&cdev_mutex);
172 list_del(&cdev->list_head);
173 mutex_unlock(&cdev_mutex);
174
175 spin_lock(&cdev_rcu_lock);
176 list_del_rcu(&cdev->rcu_node);
177 spin_unlock(&cdev_rcu_lock);
178 synchronize_rcu();
179
180 cxgbi_device_destroy(cdev);
181 }
182 EXPORT_SYMBOL_GPL(cxgbi_device_unregister);
183
184 void cxgbi_device_unregister_all(unsigned int flag)
185 {
186 struct cxgbi_device *cdev, *tmp;
187
188 mutex_lock(&cdev_mutex);
189 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
190 if ((cdev->flags & flag) == flag) {
191 mutex_unlock(&cdev_mutex);
192 cxgbi_device_unregister(cdev);
193 mutex_lock(&cdev_mutex);
194 }
195 }
196 mutex_unlock(&cdev_mutex);
197 }
198 EXPORT_SYMBOL_GPL(cxgbi_device_unregister_all);
199
200 struct cxgbi_device *cxgbi_device_find_by_lldev(void *lldev)
201 {
202 struct cxgbi_device *cdev, *tmp;
203
204 mutex_lock(&cdev_mutex);
205 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
206 if (cdev->lldev == lldev) {
207 mutex_unlock(&cdev_mutex);
208 return cdev;
209 }
210 }
211 mutex_unlock(&cdev_mutex);
212
213 log_debug(1 << CXGBI_DBG_DEV,
214 "lldev 0x%p, NO match found.\n", lldev);
215 return NULL;
216 }
217 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev);
218
219 struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev,
220 int *port)
221 {
222 struct net_device *vdev = NULL;
223 struct cxgbi_device *cdev, *tmp;
224 int i;
225
226 if (ndev->priv_flags & IFF_802_1Q_VLAN) {
227 vdev = ndev;
228 ndev = vlan_dev_real_dev(ndev);
229 log_debug(1 << CXGBI_DBG_DEV,
230 "vlan dev %s -> %s.\n", vdev->name, ndev->name);
231 }
232
233 mutex_lock(&cdev_mutex);
234 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
235 for (i = 0; i < cdev->nports; i++) {
236 if (ndev == cdev->ports[i]) {
237 cdev->hbas[i]->vdev = vdev;
238 mutex_unlock(&cdev_mutex);
239 if (port)
240 *port = i;
241 return cdev;
242 }
243 }
244 }
245 mutex_unlock(&cdev_mutex);
246 log_debug(1 << CXGBI_DBG_DEV,
247 "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
248 return NULL;
249 }
250 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev);
251
252 struct cxgbi_device *cxgbi_device_find_by_netdev_rcu(struct net_device *ndev,
253 int *port)
254 {
255 struct net_device *vdev = NULL;
256 struct cxgbi_device *cdev;
257 int i;
258
259 if (ndev->priv_flags & IFF_802_1Q_VLAN) {
260 vdev = ndev;
261 ndev = vlan_dev_real_dev(ndev);
262 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
263 }
264
265 rcu_read_lock();
266 list_for_each_entry_rcu(cdev, &cdev_rcu_list, rcu_node) {
267 for (i = 0; i < cdev->nports; i++) {
268 if (ndev == cdev->ports[i]) {
269 cdev->hbas[i]->vdev = vdev;
270 rcu_read_unlock();
271 if (port)
272 *port = i;
273 return cdev;
274 }
275 }
276 }
277 rcu_read_unlock();
278
279 log_debug(1 << CXGBI_DBG_DEV,
280 "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
281 return NULL;
282 }
283 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev_rcu);
284
285 #if IS_ENABLED(CONFIG_IPV6)
286 static struct cxgbi_device *cxgbi_device_find_by_mac(struct net_device *ndev,
287 int *port)
288 {
289 struct net_device *vdev = NULL;
290 struct cxgbi_device *cdev, *tmp;
291 int i;
292
293 if (ndev->priv_flags & IFF_802_1Q_VLAN) {
294 vdev = ndev;
295 ndev = vlan_dev_real_dev(ndev);
296 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
297 }
298
299 mutex_lock(&cdev_mutex);
300 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
301 for (i = 0; i < cdev->nports; i++) {
302 if (!memcmp(ndev->dev_addr, cdev->ports[i]->dev_addr,
303 MAX_ADDR_LEN)) {
304 cdev->hbas[i]->vdev = vdev;
305 mutex_unlock(&cdev_mutex);
306 if (port)
307 *port = i;
308 return cdev;
309 }
310 }
311 }
312 mutex_unlock(&cdev_mutex);
313 log_debug(1 << CXGBI_DBG_DEV,
314 "ndev 0x%p, %s, NO match mac found.\n",
315 ndev, ndev->name);
316 return NULL;
317 }
318 #endif
319
320 void cxgbi_hbas_remove(struct cxgbi_device *cdev)
321 {
322 int i;
323 struct cxgbi_hba *chba;
324
325 log_debug(1 << CXGBI_DBG_DEV,
326 "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
327
328 for (i = 0; i < cdev->nports; i++) {
329 chba = cdev->hbas[i];
330 if (chba) {
331 cdev->hbas[i] = NULL;
332 iscsi_host_remove(chba->shost);
333 pci_dev_put(cdev->pdev);
334 iscsi_host_free(chba->shost);
335 }
336 }
337 }
338 EXPORT_SYMBOL_GPL(cxgbi_hbas_remove);
339
340 int cxgbi_hbas_add(struct cxgbi_device *cdev, u64 max_lun,
341 unsigned int max_id, struct scsi_host_template *sht,
342 struct scsi_transport_template *stt)
343 {
344 struct cxgbi_hba *chba;
345 struct Scsi_Host *shost;
346 int i, err;
347
348 log_debug(1 << CXGBI_DBG_DEV, "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
349
350 for (i = 0; i < cdev->nports; i++) {
351 shost = iscsi_host_alloc(sht, sizeof(*chba), 1);
352 if (!shost) {
353 pr_info("0x%p, p%d, %s, host alloc failed.\n",
354 cdev, i, cdev->ports[i]->name);
355 err = -ENOMEM;
356 goto err_out;
357 }
358
359 shost->transportt = stt;
360 shost->max_lun = max_lun;
361 shost->max_id = max_id;
362 shost->max_channel = 0;
363 shost->max_cmd_len = 16;
364
365 chba = iscsi_host_priv(shost);
366 chba->cdev = cdev;
367 chba->ndev = cdev->ports[i];
368 chba->shost = shost;
369
370 log_debug(1 << CXGBI_DBG_DEV,
371 "cdev 0x%p, p#%d %s: chba 0x%p.\n",
372 cdev, i, cdev->ports[i]->name, chba);
373
374 pci_dev_get(cdev->pdev);
375 err = iscsi_host_add(shost, &cdev->pdev->dev);
376 if (err) {
377 pr_info("cdev 0x%p, p#%d %s, host add failed.\n",
378 cdev, i, cdev->ports[i]->name);
379 pci_dev_put(cdev->pdev);
380 scsi_host_put(shost);
381 goto err_out;
382 }
383
384 cdev->hbas[i] = chba;
385 }
386
387 return 0;
388
389 err_out:
390 cxgbi_hbas_remove(cdev);
391 return err;
392 }
393 EXPORT_SYMBOL_GPL(cxgbi_hbas_add);
394
395 /*
396 * iSCSI offload
397 *
398 * - source port management
399 * To find a free source port in the port allocation map we use a very simple
400 * rotor scheme to look for the next free port.
401 *
402 * If a source port has been specified make sure that it doesn't collide with
403 * our normal source port allocation map. If it's outside the range of our
404 * allocation/deallocation scheme just let them use it.
405 *
406 * If the source port is outside our allocation range, the caller is
407 * responsible for keeping track of their port usage.
408 */
409
410 static struct cxgbi_sock *find_sock_on_port(struct cxgbi_device *cdev,
411 unsigned char port_id)
412 {
413 struct cxgbi_ports_map *pmap = &cdev->pmap;
414 unsigned int i;
415 unsigned int used;
416
417 if (!pmap->max_connect || !pmap->used)
418 return NULL;
419
420 spin_lock_bh(&pmap->lock);
421 used = pmap->used;
422 for (i = 0; used && i < pmap->max_connect; i++) {
423 struct cxgbi_sock *csk = pmap->port_csk[i];
424
425 if (csk) {
426 if (csk->port_id == port_id) {
427 spin_unlock_bh(&pmap->lock);
428 return csk;
429 }
430 used--;
431 }
432 }
433 spin_unlock_bh(&pmap->lock);
434
435 return NULL;
436 }
437
438 static int sock_get_port(struct cxgbi_sock *csk)
439 {
440 struct cxgbi_device *cdev = csk->cdev;
441 struct cxgbi_ports_map *pmap = &cdev->pmap;
442 unsigned int start;
443 int idx;
444 __be16 *port;
445
446 if (!pmap->max_connect) {
447 pr_err("cdev 0x%p, p#%u %s, NO port map.\n",
448 cdev, csk->port_id, cdev->ports[csk->port_id]->name);
449 return -EADDRNOTAVAIL;
450 }
451
452 if (csk->csk_family == AF_INET)
453 port = &csk->saddr.sin_port;
454 else /* ipv6 */
455 port = &csk->saddr6.sin6_port;
456
457 if (*port) {
458 pr_err("source port NON-ZERO %u.\n",
459 ntohs(*port));
460 return -EADDRINUSE;
461 }
462
463 spin_lock_bh(&pmap->lock);
464 if (pmap->used >= pmap->max_connect) {
465 spin_unlock_bh(&pmap->lock);
466 pr_info("cdev 0x%p, p#%u %s, ALL ports used.\n",
467 cdev, csk->port_id, cdev->ports[csk->port_id]->name);
468 return -EADDRNOTAVAIL;
469 }
470
471 start = idx = pmap->next;
472 do {
473 if (++idx >= pmap->max_connect)
474 idx = 0;
475 if (!pmap->port_csk[idx]) {
476 pmap->used++;
477 *port = htons(pmap->sport_base + idx);
478 pmap->next = idx;
479 pmap->port_csk[idx] = csk;
480 spin_unlock_bh(&pmap->lock);
481 cxgbi_sock_get(csk);
482 log_debug(1 << CXGBI_DBG_SOCK,
483 "cdev 0x%p, p#%u %s, p %u, %u.\n",
484 cdev, csk->port_id,
485 cdev->ports[csk->port_id]->name,
486 pmap->sport_base + idx, pmap->next);
487 return 0;
488 }
489 } while (idx != start);
490 spin_unlock_bh(&pmap->lock);
491
492 /* should not happen */
493 pr_warn("cdev 0x%p, p#%u %s, next %u?\n",
494 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
495 pmap->next);
496 return -EADDRNOTAVAIL;
497 }
498
499 static void sock_put_port(struct cxgbi_sock *csk)
500 {
501 struct cxgbi_device *cdev = csk->cdev;
502 struct cxgbi_ports_map *pmap = &cdev->pmap;
503 __be16 *port;
504
505 if (csk->csk_family == AF_INET)
506 port = &csk->saddr.sin_port;
507 else /* ipv6 */
508 port = &csk->saddr6.sin6_port;
509
510 if (*port) {
511 int idx = ntohs(*port) - pmap->sport_base;
512
513 *port = 0;
514 if (idx < 0 || idx >= pmap->max_connect) {
515 pr_err("cdev 0x%p, p#%u %s, port %u OOR.\n",
516 cdev, csk->port_id,
517 cdev->ports[csk->port_id]->name,
518 ntohs(*port));
519 return;
520 }
521
522 spin_lock_bh(&pmap->lock);
523 pmap->port_csk[idx] = NULL;
524 pmap->used--;
525 spin_unlock_bh(&pmap->lock);
526
527 log_debug(1 << CXGBI_DBG_SOCK,
528 "cdev 0x%p, p#%u %s, release %u.\n",
529 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
530 pmap->sport_base + idx);
531
532 cxgbi_sock_put(csk);
533 }
534 }
535
536 /*
537 * iscsi tcp connection
538 */
539 void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *csk)
540 {
541 if (csk->cpl_close) {
542 kfree_skb(csk->cpl_close);
543 csk->cpl_close = NULL;
544 }
545 if (csk->cpl_abort_req) {
546 kfree_skb(csk->cpl_abort_req);
547 csk->cpl_abort_req = NULL;
548 }
549 if (csk->cpl_abort_rpl) {
550 kfree_skb(csk->cpl_abort_rpl);
551 csk->cpl_abort_rpl = NULL;
552 }
553 }
554 EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs);
555
556 static struct cxgbi_sock *cxgbi_sock_create(struct cxgbi_device *cdev)
557 {
558 struct cxgbi_sock *csk = kzalloc(sizeof(*csk), GFP_NOIO);
559
560 if (!csk) {
561 pr_info("alloc csk %zu failed.\n", sizeof(*csk));
562 return NULL;
563 }
564
565 if (cdev->csk_alloc_cpls(csk) < 0) {
566 pr_info("csk 0x%p, alloc cpls failed.\n", csk);
567 kfree(csk);
568 return NULL;
569 }
570
571 spin_lock_init(&csk->lock);
572 kref_init(&csk->refcnt);
573 skb_queue_head_init(&csk->receive_queue);
574 skb_queue_head_init(&csk->write_queue);
575 setup_timer(&csk->retry_timer, NULL, (unsigned long)csk);
576 rwlock_init(&csk->callback_lock);
577 csk->cdev = cdev;
578 csk->flags = 0;
579 cxgbi_sock_set_state(csk, CTP_CLOSED);
580
581 log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk);
582
583 return csk;
584 }
585
586 static struct rtable *find_route_ipv4(struct flowi4 *fl4,
587 __be32 saddr, __be32 daddr,
588 __be16 sport, __be16 dport, u8 tos)
589 {
590 struct rtable *rt;
591
592 rt = ip_route_output_ports(&init_net, fl4, NULL, daddr, saddr,
593 dport, sport, IPPROTO_TCP, tos, 0);
594 if (IS_ERR(rt))
595 return NULL;
596
597 return rt;
598 }
599
600 static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr)
601 {
602 struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
603 struct dst_entry *dst;
604 struct net_device *ndev;
605 struct cxgbi_device *cdev;
606 struct rtable *rt = NULL;
607 struct neighbour *n;
608 struct flowi4 fl4;
609 struct cxgbi_sock *csk = NULL;
610 unsigned int mtu = 0;
611 int port = 0xFFFF;
612 int err = 0;
613
614 rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0, daddr->sin_port, 0);
615 if (!rt) {
616 pr_info("no route to ipv4 0x%x, port %u.\n",
617 be32_to_cpu(daddr->sin_addr.s_addr),
618 be16_to_cpu(daddr->sin_port));
619 err = -ENETUNREACH;
620 goto err_out;
621 }
622 dst = &rt->dst;
623 n = dst_neigh_lookup(dst, &daddr->sin_addr.s_addr);
624 if (!n) {
625 err = -ENODEV;
626 goto rel_rt;
627 }
628 ndev = n->dev;
629
630 if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
631 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
632 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
633 ndev->name);
634 err = -ENETUNREACH;
635 goto rel_neigh;
636 }
637
638 if (ndev->flags & IFF_LOOPBACK) {
639 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
640 mtu = ndev->mtu;
641 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
642 n->dev->name, ndev->name, mtu);
643 }
644
645 cdev = cxgbi_device_find_by_netdev(ndev, &port);
646 if (!cdev) {
647 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
648 &daddr->sin_addr.s_addr, ndev->name);
649 err = -ENETUNREACH;
650 goto rel_neigh;
651 }
652 log_debug(1 << CXGBI_DBG_SOCK,
653 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
654 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
655 port, ndev->name, cdev);
656
657 csk = cxgbi_sock_create(cdev);
658 if (!csk) {
659 err = -ENOMEM;
660 goto rel_neigh;
661 }
662 csk->cdev = cdev;
663 csk->port_id = port;
664 csk->mtu = mtu;
665 csk->dst = dst;
666
667 csk->csk_family = AF_INET;
668 csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
669 csk->daddr.sin_port = daddr->sin_port;
670 csk->daddr.sin_family = daddr->sin_family;
671 csk->saddr.sin_family = daddr->sin_family;
672 csk->saddr.sin_addr.s_addr = fl4.saddr;
673 neigh_release(n);
674
675 return csk;
676
677 rel_neigh:
678 neigh_release(n);
679
680 rel_rt:
681 ip_rt_put(rt);
682 if (csk)
683 cxgbi_sock_closed(csk);
684 err_out:
685 return ERR_PTR(err);
686 }
687
688 #if IS_ENABLED(CONFIG_IPV6)
689 static struct rt6_info *find_route_ipv6(const struct in6_addr *saddr,
690 const struct in6_addr *daddr)
691 {
692 struct flowi6 fl;
693
694 memset(&fl, 0, sizeof(fl));
695 if (saddr)
696 memcpy(&fl.saddr, saddr, sizeof(struct in6_addr));
697 if (daddr)
698 memcpy(&fl.daddr, daddr, sizeof(struct in6_addr));
699 return (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl);
700 }
701
702 static struct cxgbi_sock *cxgbi_check_route6(struct sockaddr *dst_addr)
703 {
704 struct sockaddr_in6 *daddr6 = (struct sockaddr_in6 *)dst_addr;
705 struct dst_entry *dst;
706 struct net_device *ndev;
707 struct cxgbi_device *cdev;
708 struct rt6_info *rt = NULL;
709 struct neighbour *n;
710 struct in6_addr pref_saddr;
711 struct cxgbi_sock *csk = NULL;
712 unsigned int mtu = 0;
713 int port = 0xFFFF;
714 int err = 0;
715
716 rt = find_route_ipv6(NULL, &daddr6->sin6_addr);
717
718 if (!rt) {
719 pr_info("no route to ipv6 %pI6 port %u\n",
720 daddr6->sin6_addr.s6_addr,
721 be16_to_cpu(daddr6->sin6_port));
722 err = -ENETUNREACH;
723 goto err_out;
724 }
725
726 dst = &rt->dst;
727
728 n = dst_neigh_lookup(dst, &daddr6->sin6_addr);
729
730 if (!n) {
731 pr_info("%pI6, port %u, dst no neighbour.\n",
732 daddr6->sin6_addr.s6_addr,
733 be16_to_cpu(daddr6->sin6_port));
734 err = -ENETUNREACH;
735 goto rel_rt;
736 }
737 ndev = n->dev;
738
739 if (ipv6_addr_is_multicast(&daddr6->sin6_addr)) {
740 pr_info("multi-cast route %pI6 port %u, dev %s.\n",
741 daddr6->sin6_addr.s6_addr,
742 ntohs(daddr6->sin6_port), ndev->name);
743 err = -ENETUNREACH;
744 goto rel_rt;
745 }
746
747 cdev = cxgbi_device_find_by_netdev(ndev, &port);
748 if (!cdev)
749 cdev = cxgbi_device_find_by_mac(ndev, &port);
750 if (!cdev) {
751 pr_info("dst %pI6 %s, NOT cxgbi device.\n",
752 daddr6->sin6_addr.s6_addr, ndev->name);
753 err = -ENETUNREACH;
754 goto rel_rt;
755 }
756 log_debug(1 << CXGBI_DBG_SOCK,
757 "route to %pI6 :%u, ndev p#%d,%s, cdev 0x%p.\n",
758 daddr6->sin6_addr.s6_addr, ntohs(daddr6->sin6_port), port,
759 ndev->name, cdev);
760
761 csk = cxgbi_sock_create(cdev);
762 if (!csk) {
763 err = -ENOMEM;
764 goto rel_rt;
765 }
766 csk->cdev = cdev;
767 csk->port_id = port;
768 csk->mtu = mtu;
769 csk->dst = dst;
770
771 if (ipv6_addr_any(&rt->rt6i_prefsrc.addr)) {
772 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry *)rt);
773
774 err = ipv6_dev_get_saddr(&init_net, idev ? idev->dev : NULL,
775 &daddr6->sin6_addr, 0, &pref_saddr);
776 if (err) {
777 pr_info("failed to get source address to reach %pI6\n",
778 &daddr6->sin6_addr);
779 goto rel_rt;
780 }
781 } else {
782 pref_saddr = rt->rt6i_prefsrc.addr;
783 }
784
785 csk->csk_family = AF_INET6;
786 csk->daddr6.sin6_addr = daddr6->sin6_addr;
787 csk->daddr6.sin6_port = daddr6->sin6_port;
788 csk->daddr6.sin6_family = daddr6->sin6_family;
789 csk->saddr6.sin6_family = daddr6->sin6_family;
790 csk->saddr6.sin6_addr = pref_saddr;
791
792 neigh_release(n);
793 return csk;
794
795 rel_rt:
796 if (n)
797 neigh_release(n);
798
799 ip6_rt_put(rt);
800 if (csk)
801 cxgbi_sock_closed(csk);
802 err_out:
803 return ERR_PTR(err);
804 }
805 #endif /* IS_ENABLED(CONFIG_IPV6) */
806
807 void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
808 unsigned int opt)
809 {
810 csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
811 dst_confirm(csk->dst);
812 smp_mb();
813 cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
814 }
815 EXPORT_SYMBOL_GPL(cxgbi_sock_established);
816
817 static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
818 {
819 log_debug(1 << CXGBI_DBG_SOCK,
820 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
821 csk, csk->state, csk->flags, csk->user_data);
822
823 if (csk->state != CTP_ESTABLISHED) {
824 read_lock_bh(&csk->callback_lock);
825 if (csk->user_data)
826 iscsi_conn_failure(csk->user_data,
827 ISCSI_ERR_TCP_CONN_CLOSE);
828 read_unlock_bh(&csk->callback_lock);
829 }
830 }
831
832 void cxgbi_sock_closed(struct cxgbi_sock *csk)
833 {
834 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
835 csk, (csk)->state, (csk)->flags, (csk)->tid);
836 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
837 if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
838 return;
839 if (csk->saddr.sin_port)
840 sock_put_port(csk);
841 if (csk->dst)
842 dst_release(csk->dst);
843 csk->cdev->csk_release_offload_resources(csk);
844 cxgbi_sock_set_state(csk, CTP_CLOSED);
845 cxgbi_inform_iscsi_conn_closing(csk);
846 cxgbi_sock_put(csk);
847 }
848 EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
849
850 static void need_active_close(struct cxgbi_sock *csk)
851 {
852 int data_lost;
853 int close_req = 0;
854
855 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
856 csk, (csk)->state, (csk)->flags, (csk)->tid);
857 spin_lock_bh(&csk->lock);
858 dst_confirm(csk->dst);
859 data_lost = skb_queue_len(&csk->receive_queue);
860 __skb_queue_purge(&csk->receive_queue);
861
862 if (csk->state == CTP_ACTIVE_OPEN)
863 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
864 else if (csk->state == CTP_ESTABLISHED) {
865 close_req = 1;
866 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
867 } else if (csk->state == CTP_PASSIVE_CLOSE) {
868 close_req = 1;
869 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
870 }
871
872 if (close_req) {
873 if (data_lost)
874 csk->cdev->csk_send_abort_req(csk);
875 else
876 csk->cdev->csk_send_close_req(csk);
877 }
878
879 spin_unlock_bh(&csk->lock);
880 }
881
882 void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
883 {
884 pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
885 csk, csk->state, csk->flags,
886 &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
887 &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
888 errno);
889
890 cxgbi_sock_set_state(csk, CTP_CONNECTING);
891 csk->err = errno;
892 cxgbi_sock_closed(csk);
893 }
894 EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
895
896 void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
897 {
898 struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
899
900 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
901 csk, (csk)->state, (csk)->flags, (csk)->tid);
902 cxgbi_sock_get(csk);
903 spin_lock_bh(&csk->lock);
904 if (csk->state == CTP_ACTIVE_OPEN)
905 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
906 spin_unlock_bh(&csk->lock);
907 cxgbi_sock_put(csk);
908 __kfree_skb(skb);
909 }
910 EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
911
912 void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
913 {
914 cxgbi_sock_get(csk);
915 spin_lock_bh(&csk->lock);
916
917 cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
918 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
919 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
920 if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
921 pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
922 csk, csk->state, csk->flags, csk->tid);
923 cxgbi_sock_closed(csk);
924 }
925
926 spin_unlock_bh(&csk->lock);
927 cxgbi_sock_put(csk);
928 }
929 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
930
931 void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
932 {
933 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
934 csk, (csk)->state, (csk)->flags, (csk)->tid);
935 cxgbi_sock_get(csk);
936 spin_lock_bh(&csk->lock);
937
938 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
939 goto done;
940
941 switch (csk->state) {
942 case CTP_ESTABLISHED:
943 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
944 break;
945 case CTP_ACTIVE_CLOSE:
946 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
947 break;
948 case CTP_CLOSE_WAIT_1:
949 cxgbi_sock_closed(csk);
950 break;
951 case CTP_ABORTING:
952 break;
953 default:
954 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
955 csk, csk->state, csk->flags, csk->tid);
956 }
957 cxgbi_inform_iscsi_conn_closing(csk);
958 done:
959 spin_unlock_bh(&csk->lock);
960 cxgbi_sock_put(csk);
961 }
962 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
963
964 void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
965 {
966 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
967 csk, (csk)->state, (csk)->flags, (csk)->tid);
968 cxgbi_sock_get(csk);
969 spin_lock_bh(&csk->lock);
970
971 csk->snd_una = snd_nxt - 1;
972 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
973 goto done;
974
975 switch (csk->state) {
976 case CTP_ACTIVE_CLOSE:
977 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
978 break;
979 case CTP_CLOSE_WAIT_1:
980 case CTP_CLOSE_WAIT_2:
981 cxgbi_sock_closed(csk);
982 break;
983 case CTP_ABORTING:
984 break;
985 default:
986 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
987 csk, csk->state, csk->flags, csk->tid);
988 }
989 done:
990 spin_unlock_bh(&csk->lock);
991 cxgbi_sock_put(csk);
992 }
993 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
994
995 void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
996 unsigned int snd_una, int seq_chk)
997 {
998 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
999 "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
1000 csk, csk->state, csk->flags, csk->tid, credits,
1001 csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
1002
1003 spin_lock_bh(&csk->lock);
1004
1005 csk->wr_cred += credits;
1006 if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
1007 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
1008
1009 while (credits) {
1010 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
1011
1012 if (unlikely(!p)) {
1013 pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
1014 csk, csk->state, csk->flags, csk->tid, credits,
1015 csk->wr_cred, csk->wr_una_cred);
1016 break;
1017 }
1018
1019 if (unlikely(credits < p->csum)) {
1020 pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
1021 csk, csk->state, csk->flags, csk->tid,
1022 credits, csk->wr_cred, csk->wr_una_cred,
1023 p->csum);
1024 p->csum -= credits;
1025 break;
1026 } else {
1027 cxgbi_sock_dequeue_wr(csk);
1028 credits -= p->csum;
1029 kfree_skb(p);
1030 }
1031 }
1032
1033 cxgbi_sock_check_wr_invariants(csk);
1034
1035 if (seq_chk) {
1036 if (unlikely(before(snd_una, csk->snd_una))) {
1037 pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
1038 csk, csk->state, csk->flags, csk->tid, snd_una,
1039 csk->snd_una);
1040 goto done;
1041 }
1042
1043 if (csk->snd_una != snd_una) {
1044 csk->snd_una = snd_una;
1045 dst_confirm(csk->dst);
1046 }
1047 }
1048
1049 if (skb_queue_len(&csk->write_queue)) {
1050 if (csk->cdev->csk_push_tx_frames(csk, 0))
1051 cxgbi_conn_tx_open(csk);
1052 } else
1053 cxgbi_conn_tx_open(csk);
1054 done:
1055 spin_unlock_bh(&csk->lock);
1056 }
1057 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
1058
1059 static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
1060 unsigned short mtu)
1061 {
1062 int i = 0;
1063
1064 while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
1065 ++i;
1066
1067 return i;
1068 }
1069
1070 unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
1071 {
1072 unsigned int idx;
1073 struct dst_entry *dst = csk->dst;
1074
1075 csk->advmss = dst_metric_advmss(dst);
1076
1077 if (csk->advmss > pmtu - 40)
1078 csk->advmss = pmtu - 40;
1079 if (csk->advmss < csk->cdev->mtus[0] - 40)
1080 csk->advmss = csk->cdev->mtus[0] - 40;
1081 idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
1082
1083 return idx;
1084 }
1085 EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
1086
1087 void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
1088 {
1089 cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
1090 __skb_queue_tail(&csk->write_queue, skb);
1091 }
1092 EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
1093
1094 void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
1095 {
1096 struct sk_buff *skb;
1097
1098 while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
1099 kfree_skb(skb);
1100 }
1101 EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
1102
1103 void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
1104 {
1105 int pending = cxgbi_sock_count_pending_wrs(csk);
1106
1107 if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
1108 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
1109 csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
1110 }
1111 EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
1112
1113 static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
1114 {
1115 struct cxgbi_device *cdev = csk->cdev;
1116 struct sk_buff *next;
1117 int err, copied = 0;
1118
1119 spin_lock_bh(&csk->lock);
1120
1121 if (csk->state != CTP_ESTABLISHED) {
1122 log_debug(1 << CXGBI_DBG_PDU_TX,
1123 "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
1124 csk, csk->state, csk->flags, csk->tid);
1125 err = -EAGAIN;
1126 goto out_err;
1127 }
1128
1129 if (csk->err) {
1130 log_debug(1 << CXGBI_DBG_PDU_TX,
1131 "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
1132 csk, csk->state, csk->flags, csk->tid, csk->err);
1133 err = -EPIPE;
1134 goto out_err;
1135 }
1136
1137 if (csk->write_seq - csk->snd_una >= csk->snd_win) {
1138 log_debug(1 << CXGBI_DBG_PDU_TX,
1139 "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
1140 csk, csk->state, csk->flags, csk->tid, csk->write_seq,
1141 csk->snd_una, csk->snd_win);
1142 err = -ENOBUFS;
1143 goto out_err;
1144 }
1145
1146 while (skb) {
1147 int frags = skb_shinfo(skb)->nr_frags +
1148 (skb->len != skb->data_len);
1149
1150 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
1151 pr_err("csk 0x%p, skb head %u < %u.\n",
1152 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
1153 err = -EINVAL;
1154 goto out_err;
1155 }
1156
1157 if (frags >= SKB_WR_LIST_SIZE) {
1158 pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
1159 csk, skb_shinfo(skb)->nr_frags, skb->len,
1160 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
1161 err = -EINVAL;
1162 goto out_err;
1163 }
1164
1165 next = skb->next;
1166 skb->next = NULL;
1167 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
1168 cxgbi_sock_skb_entail(csk, skb);
1169 copied += skb->len;
1170 csk->write_seq += skb->len +
1171 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
1172 skb = next;
1173 }
1174 done:
1175 if (likely(skb_queue_len(&csk->write_queue)))
1176 cdev->csk_push_tx_frames(csk, 1);
1177 spin_unlock_bh(&csk->lock);
1178 return copied;
1179
1180 out_err:
1181 if (copied == 0 && err == -EPIPE)
1182 copied = csk->err ? csk->err : -EPIPE;
1183 else
1184 copied = err;
1185 goto done;
1186 }
1187
1188 static inline void
1189 scmd_get_params(struct scsi_cmnd *sc, struct scatterlist **sgl,
1190 unsigned int *sgcnt, unsigned int *dlen,
1191 unsigned int prot)
1192 {
1193 struct scsi_data_buffer *sdb = prot ? scsi_prot(sc) : scsi_out(sc);
1194
1195 *sgl = sdb->table.sgl;
1196 *sgcnt = sdb->table.nents;
1197 *dlen = sdb->length;
1198 /* Caution: for protection sdb, sdb->length is invalid */
1199 }
1200
1201 void cxgbi_ddp_set_one_ppod(struct cxgbi_pagepod *ppod,
1202 struct cxgbi_task_tag_info *ttinfo,
1203 struct scatterlist **sg_pp, unsigned int *sg_off)
1204 {
1205 struct scatterlist *sg = sg_pp ? *sg_pp : NULL;
1206 unsigned int offset = sg_off ? *sg_off : 0;
1207 dma_addr_t addr = 0UL;
1208 unsigned int len = 0;
1209 int i;
1210
1211 memcpy(ppod, &ttinfo->hdr, sizeof(struct cxgbi_pagepod_hdr));
1212
1213 if (sg) {
1214 addr = sg_dma_address(sg);
1215 len = sg_dma_len(sg);
1216 }
1217
1218 for (i = 0; i < PPOD_PAGES_MAX; i++) {
1219 if (sg) {
1220 ppod->addr[i] = cpu_to_be64(addr + offset);
1221 offset += PAGE_SIZE;
1222 if (offset == (len + sg->offset)) {
1223 offset = 0;
1224 sg = sg_next(sg);
1225 if (sg) {
1226 addr = sg_dma_address(sg);
1227 len = sg_dma_len(sg);
1228 }
1229 }
1230 } else {
1231 ppod->addr[i] = 0ULL;
1232 }
1233 }
1234
1235 /*
1236 * the fifth address needs to be repeated in the next ppod, so do
1237 * not move sg
1238 */
1239 if (sg_pp) {
1240 *sg_pp = sg;
1241 *sg_off = offset;
1242 }
1243
1244 if (offset == len) {
1245 offset = 0;
1246 sg = sg_next(sg);
1247 if (sg) {
1248 addr = sg_dma_address(sg);
1249 len = sg_dma_len(sg);
1250 }
1251 }
1252 ppod->addr[i] = sg ? cpu_to_be64(addr + offset) : 0ULL;
1253 }
1254 EXPORT_SYMBOL_GPL(cxgbi_ddp_set_one_ppod);
1255
1256 /*
1257 * APIs interacting with open-iscsi libraries
1258 */
1259
1260 static unsigned char padding[4];
1261
1262 void cxgbi_ddp_ppm_setup(void **ppm_pp, struct cxgbi_device *cdev,
1263 struct cxgbi_tag_format *tformat, unsigned int ppmax,
1264 unsigned int llimit, unsigned int start,
1265 unsigned int rsvd_factor)
1266 {
1267 int err = cxgbi_ppm_init(ppm_pp, cdev->ports[0], cdev->pdev,
1268 cdev->lldev, tformat, ppmax, llimit, start,
1269 rsvd_factor);
1270
1271 if (err >= 0) {
1272 struct cxgbi_ppm *ppm = (struct cxgbi_ppm *)(*ppm_pp);
1273
1274 if (ppm->ppmax < 1024 ||
1275 ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX)
1276 cdev->flags |= CXGBI_FLAG_DDP_OFF;
1277 err = 0;
1278 } else {
1279 cdev->flags |= CXGBI_FLAG_DDP_OFF;
1280 }
1281 }
1282 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppm_setup);
1283
1284 static int cxgbi_ddp_sgl_check(struct scatterlist *sgl, int nents)
1285 {
1286 int i;
1287 int last_sgidx = nents - 1;
1288 struct scatterlist *sg = sgl;
1289
1290 for (i = 0; i < nents; i++, sg = sg_next(sg)) {
1291 unsigned int len = sg->length + sg->offset;
1292
1293 if ((sg->offset & 0x3) || (i && sg->offset) ||
1294 ((i != last_sgidx) && len != PAGE_SIZE)) {
1295 log_debug(1 << CXGBI_DBG_DDP,
1296 "sg %u/%u, %u,%u, not aligned.\n",
1297 i, nents, sg->offset, sg->length);
1298 goto err_out;
1299 }
1300 }
1301 return 0;
1302 err_out:
1303 return -EINVAL;
1304 }
1305
1306 static int cxgbi_ddp_reserve(struct cxgbi_conn *cconn,
1307 struct cxgbi_task_data *tdata, u32 sw_tag,
1308 unsigned int xferlen)
1309 {
1310 struct cxgbi_sock *csk = cconn->cep->csk;
1311 struct cxgbi_device *cdev = csk->cdev;
1312 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1313 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1314 struct scatterlist *sgl = ttinfo->sgl;
1315 unsigned int sgcnt = ttinfo->nents;
1316 unsigned int sg_offset = sgl->offset;
1317 int err;
1318
1319 if (cdev->flags & CXGBI_FLAG_DDP_OFF) {
1320 log_debug(1 << CXGBI_DBG_DDP,
1321 "cdev 0x%p DDP off.\n", cdev);
1322 return -EINVAL;
1323 }
1324
1325 if (!ppm || xferlen < DDP_THRESHOLD || !sgcnt ||
1326 ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX) {
1327 log_debug(1 << CXGBI_DBG_DDP,
1328 "ppm 0x%p, pgidx %u, xfer %u, sgcnt %u, NO ddp.\n",
1329 ppm, ppm ? ppm->tformat.pgsz_idx_dflt : DDP_PGIDX_MAX,
1330 xferlen, ttinfo->nents);
1331 return -EINVAL;
1332 }
1333
1334 /* make sure the buffer is suitable for ddp */
1335 if (cxgbi_ddp_sgl_check(sgl, sgcnt) < 0)
1336 return -EINVAL;
1337
1338 ttinfo->nr_pages = (xferlen + sgl->offset + (1 << PAGE_SHIFT) - 1) >>
1339 PAGE_SHIFT;
1340
1341 /*
1342 * the ddp tag will be used for the itt in the outgoing pdu,
1343 * the itt genrated by libiscsi is saved in the ppm and can be
1344 * retrieved via the ddp tag
1345 */
1346 err = cxgbi_ppm_ppods_reserve(ppm, ttinfo->nr_pages, 0, &ttinfo->idx,
1347 &ttinfo->tag, (unsigned long)sw_tag);
1348 if (err < 0) {
1349 cconn->ddp_full++;
1350 return err;
1351 }
1352 ttinfo->npods = err;
1353
1354 /* setup dma from scsi command sgl */
1355 sgl->offset = 0;
1356 err = dma_map_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1357 sgl->offset = sg_offset;
1358 if (err == 0) {
1359 pr_info("%s: 0x%x, xfer %u, sgl %u dma mapping err.\n",
1360 __func__, sw_tag, xferlen, sgcnt);
1361 goto rel_ppods;
1362 }
1363 if (err != ttinfo->nr_pages) {
1364 log_debug(1 << CXGBI_DBG_DDP,
1365 "%s: sw tag 0x%x, xfer %u, sgl %u, dma count %d.\n",
1366 __func__, sw_tag, xferlen, sgcnt, err);
1367 }
1368
1369 ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_MAPPED;
1370 ttinfo->cid = csk->port_id;
1371
1372 cxgbi_ppm_make_ppod_hdr(ppm, ttinfo->tag, csk->tid, sgl->offset,
1373 xferlen, &ttinfo->hdr);
1374
1375 if (cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ) {
1376 /* write ppod from xmit_pdu (of iscsi_scsi_command pdu) */
1377 ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_VALID;
1378 } else {
1379 /* write ppod from control queue now */
1380 err = cdev->csk_ddp_set_map(ppm, csk, ttinfo);
1381 if (err < 0)
1382 goto rel_ppods;
1383 }
1384
1385 return 0;
1386
1387 rel_ppods:
1388 cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1389
1390 if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_MAPPED) {
1391 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_MAPPED;
1392 dma_unmap_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1393 }
1394 return -EINVAL;
1395 }
1396
1397 static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1398 {
1399 struct scsi_cmnd *sc = task->sc;
1400 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1401 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1402 struct cxgbi_device *cdev = cconn->chba->cdev;
1403 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1404 u32 tag = ntohl((__force u32)hdr_itt);
1405
1406 log_debug(1 << CXGBI_DBG_DDP,
1407 "cdev 0x%p, task 0x%p, release tag 0x%x.\n",
1408 cdev, task, tag);
1409 if (sc &&
1410 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
1411 cxgbi_ppm_is_ddp_tag(ppm, tag)) {
1412 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1413 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1414
1415 if (!(cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ))
1416 cdev->csk_ddp_clear_map(cdev, ppm, ttinfo);
1417 cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1418 dma_unmap_sg(&ppm->pdev->dev, ttinfo->sgl, ttinfo->nents,
1419 DMA_FROM_DEVICE);
1420 }
1421 }
1422
1423 static inline u32 cxgbi_build_sw_tag(u32 idx, u32 age)
1424 {
1425 /* assume idx and age both are < 0x7FFF (32767) */
1426 return (idx << 16) | age;
1427 }
1428
1429 static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1430 {
1431 struct scsi_cmnd *sc = task->sc;
1432 struct iscsi_conn *conn = task->conn;
1433 struct iscsi_session *sess = conn->session;
1434 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1435 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1436 struct cxgbi_device *cdev = cconn->chba->cdev;
1437 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1438 u32 sw_tag = cxgbi_build_sw_tag(task->itt, sess->age);
1439 u32 tag = 0;
1440 int err = -EINVAL;
1441
1442 if (sc &&
1443 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)
1444 ) {
1445 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1446 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1447
1448 scmd_get_params(sc, &ttinfo->sgl, &ttinfo->nents,
1449 &tdata->dlen, 0);
1450 err = cxgbi_ddp_reserve(cconn, tdata, sw_tag, tdata->dlen);
1451 if (!err)
1452 tag = ttinfo->tag;
1453 else
1454 log_debug(1 << CXGBI_DBG_DDP,
1455 "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1456 cconn->cep->csk, task, tdata->dlen,
1457 ttinfo->nents);
1458 }
1459
1460 if (err < 0) {
1461 err = cxgbi_ppm_make_non_ddp_tag(ppm, sw_tag, &tag);
1462 if (err < 0)
1463 return err;
1464 }
1465 /* the itt need to sent in big-endian order */
1466 *hdr_itt = (__force itt_t)htonl(tag);
1467
1468 log_debug(1 << CXGBI_DBG_DDP,
1469 "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1470 cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1471 return 0;
1472 }
1473
1474 void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1475 {
1476 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1477 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1478 struct cxgbi_device *cdev = cconn->chba->cdev;
1479 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1480 u32 tag = ntohl((__force u32)itt);
1481 u32 sw_bits;
1482
1483 if (ppm) {
1484 if (cxgbi_ppm_is_ddp_tag(ppm, tag))
1485 sw_bits = cxgbi_ppm_get_tag_caller_data(ppm, tag);
1486 else
1487 sw_bits = cxgbi_ppm_decode_non_ddp_tag(ppm, tag);
1488 } else {
1489 sw_bits = tag;
1490 }
1491
1492 cxgbi_decode_sw_tag(sw_bits, idx, age);
1493 log_debug(1 << CXGBI_DBG_DDP,
1494 "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1495 cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1496 age ? *age : 0xFF);
1497 }
1498 EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1499
1500 void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1501 {
1502 struct iscsi_conn *conn = csk->user_data;
1503
1504 if (conn) {
1505 log_debug(1 << CXGBI_DBG_SOCK,
1506 "csk 0x%p, cid %d.\n", csk, conn->id);
1507 iscsi_conn_queue_work(conn);
1508 }
1509 }
1510 EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1511
1512 /*
1513 * pdu receive, interact with libiscsi_tcp
1514 */
1515 static inline int read_pdu_skb(struct iscsi_conn *conn,
1516 struct sk_buff *skb,
1517 unsigned int offset,
1518 int offloaded)
1519 {
1520 int status = 0;
1521 int bytes_read;
1522
1523 bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1524 switch (status) {
1525 case ISCSI_TCP_CONN_ERR:
1526 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1527 skb, offset, offloaded);
1528 return -EIO;
1529 case ISCSI_TCP_SUSPENDED:
1530 log_debug(1 << CXGBI_DBG_PDU_RX,
1531 "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1532 skb, offset, offloaded, bytes_read);
1533 /* no transfer - just have caller flush queue */
1534 return bytes_read;
1535 case ISCSI_TCP_SKB_DONE:
1536 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1537 skb, offset, offloaded);
1538 /*
1539 * pdus should always fit in the skb and we should get
1540 * segment done notifcation.
1541 */
1542 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1543 return -EFAULT;
1544 case ISCSI_TCP_SEGMENT_DONE:
1545 log_debug(1 << CXGBI_DBG_PDU_RX,
1546 "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1547 skb, offset, offloaded, bytes_read);
1548 return bytes_read;
1549 default:
1550 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1551 skb, offset, offloaded, status);
1552 return -EINVAL;
1553 }
1554 }
1555
1556 static int skb_read_pdu_bhs(struct iscsi_conn *conn, struct sk_buff *skb)
1557 {
1558 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1559
1560 log_debug(1 << CXGBI_DBG_PDU_RX,
1561 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1562 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1563
1564 if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1565 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1566 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1567 return -EIO;
1568 }
1569
1570 if (conn->hdrdgst_en &&
1571 cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1572 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1573 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1574 return -EIO;
1575 }
1576
1577 return read_pdu_skb(conn, skb, 0, 0);
1578 }
1579
1580 static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1581 struct sk_buff *skb, unsigned int offset)
1582 {
1583 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1584 bool offloaded = 0;
1585 int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1586
1587 log_debug(1 << CXGBI_DBG_PDU_RX,
1588 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1589 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1590
1591 if (conn->datadgst_en &&
1592 cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1593 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1594 conn, lskb, cxgbi_skcb_flags(lskb));
1595 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1596 return -EIO;
1597 }
1598
1599 if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1600 return 0;
1601
1602 /* coalesced, add header digest length */
1603 if (lskb == skb && conn->hdrdgst_en)
1604 offset += ISCSI_DIGEST_SIZE;
1605
1606 if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1607 offloaded = 1;
1608
1609 if (opcode == ISCSI_OP_SCSI_DATA_IN)
1610 log_debug(1 << CXGBI_DBG_PDU_RX,
1611 "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1612 skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1613 tcp_conn->in.datalen, offloaded ? "is" : "not");
1614
1615 return read_pdu_skb(conn, skb, offset, offloaded);
1616 }
1617
1618 static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1619 {
1620 struct cxgbi_device *cdev = csk->cdev;
1621 int must_send;
1622 u32 credits;
1623
1624 log_debug(1 << CXGBI_DBG_PDU_RX,
1625 "csk 0x%p,%u,0x%lx,%u, seq %u, wup %u, thre %u, %u.\n",
1626 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1627 csk->rcv_wup, cdev->rx_credit_thres,
1628 csk->rcv_win);
1629
1630 if (csk->state != CTP_ESTABLISHED)
1631 return;
1632
1633 credits = csk->copied_seq - csk->rcv_wup;
1634 if (unlikely(!credits))
1635 return;
1636 if (unlikely(cdev->rx_credit_thres == 0))
1637 return;
1638
1639 must_send = credits + 16384 >= csk->rcv_win;
1640 if (must_send || credits >= cdev->rx_credit_thres)
1641 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1642 }
1643
1644 void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1645 {
1646 struct cxgbi_device *cdev = csk->cdev;
1647 struct iscsi_conn *conn = csk->user_data;
1648 struct sk_buff *skb;
1649 unsigned int read = 0;
1650 int err = 0;
1651
1652 log_debug(1 << CXGBI_DBG_PDU_RX,
1653 "csk 0x%p, conn 0x%p.\n", csk, conn);
1654
1655 if (unlikely(!conn || conn->suspend_rx)) {
1656 log_debug(1 << CXGBI_DBG_PDU_RX,
1657 "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1658 csk, conn, conn ? conn->id : 0xFF,
1659 conn ? conn->suspend_rx : 0xFF);
1660 return;
1661 }
1662
1663 while (!err) {
1664 skb = skb_peek(&csk->receive_queue);
1665 if (!skb ||
1666 !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1667 if (skb)
1668 log_debug(1 << CXGBI_DBG_PDU_RX,
1669 "skb 0x%p, NOT ready 0x%lx.\n",
1670 skb, cxgbi_skcb_flags(skb));
1671 break;
1672 }
1673 __skb_unlink(skb, &csk->receive_queue);
1674
1675 read += cxgbi_skcb_rx_pdulen(skb);
1676 log_debug(1 << CXGBI_DBG_PDU_RX,
1677 "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1678 csk, skb, skb->len, cxgbi_skcb_flags(skb),
1679 cxgbi_skcb_rx_pdulen(skb));
1680
1681 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1682 err = skb_read_pdu_bhs(conn, skb);
1683 if (err < 0) {
1684 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1685 "f 0x%lx, plen %u.\n",
1686 csk, skb, skb->len,
1687 cxgbi_skcb_flags(skb),
1688 cxgbi_skcb_rx_pdulen(skb));
1689 goto skb_done;
1690 }
1691 err = skb_read_pdu_data(conn, skb, skb,
1692 err + cdev->skb_rx_extra);
1693 if (err < 0)
1694 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1695 "f 0x%lx, plen %u.\n",
1696 csk, skb, skb->len,
1697 cxgbi_skcb_flags(skb),
1698 cxgbi_skcb_rx_pdulen(skb));
1699 } else {
1700 err = skb_read_pdu_bhs(conn, skb);
1701 if (err < 0) {
1702 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1703 "f 0x%lx, plen %u.\n",
1704 csk, skb, skb->len,
1705 cxgbi_skcb_flags(skb),
1706 cxgbi_skcb_rx_pdulen(skb));
1707 goto skb_done;
1708 }
1709
1710 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1711 struct sk_buff *dskb;
1712
1713 dskb = skb_peek(&csk->receive_queue);
1714 if (!dskb) {
1715 pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1716 " plen %u, NO data.\n",
1717 csk, skb, skb->len,
1718 cxgbi_skcb_flags(skb),
1719 cxgbi_skcb_rx_pdulen(skb));
1720 err = -EIO;
1721 goto skb_done;
1722 }
1723 __skb_unlink(dskb, &csk->receive_queue);
1724
1725 err = skb_read_pdu_data(conn, skb, dskb, 0);
1726 if (err < 0)
1727 pr_err("data, csk 0x%p, skb 0x%p,%u, "
1728 "f 0x%lx, plen %u, dskb 0x%p,"
1729 "%u.\n",
1730 csk, skb, skb->len,
1731 cxgbi_skcb_flags(skb),
1732 cxgbi_skcb_rx_pdulen(skb),
1733 dskb, dskb->len);
1734 __kfree_skb(dskb);
1735 } else
1736 err = skb_read_pdu_data(conn, skb, skb, 0);
1737 }
1738 skb_done:
1739 __kfree_skb(skb);
1740
1741 if (err < 0)
1742 break;
1743 }
1744
1745 log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
1746 if (read) {
1747 csk->copied_seq += read;
1748 csk_return_rx_credits(csk, read);
1749 conn->rxdata_octets += read;
1750 }
1751
1752 if (err < 0) {
1753 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
1754 csk, conn, err, read);
1755 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1756 }
1757 }
1758 EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
1759
1760 static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
1761 unsigned int offset, unsigned int *off,
1762 struct scatterlist **sgp)
1763 {
1764 int i;
1765 struct scatterlist *sg;
1766
1767 for_each_sg(sgl, sg, sgcnt, i) {
1768 if (offset < sg->length) {
1769 *off = offset;
1770 *sgp = sg;
1771 return 0;
1772 }
1773 offset -= sg->length;
1774 }
1775 return -EFAULT;
1776 }
1777
1778 static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
1779 unsigned int dlen, struct page_frag *frags,
1780 int frag_max)
1781 {
1782 unsigned int datalen = dlen;
1783 unsigned int sglen = sg->length - sgoffset;
1784 struct page *page = sg_page(sg);
1785 int i;
1786
1787 i = 0;
1788 do {
1789 unsigned int copy;
1790
1791 if (!sglen) {
1792 sg = sg_next(sg);
1793 if (!sg) {
1794 pr_warn("sg %d NULL, len %u/%u.\n",
1795 i, datalen, dlen);
1796 return -EINVAL;
1797 }
1798 sgoffset = 0;
1799 sglen = sg->length;
1800 page = sg_page(sg);
1801
1802 }
1803 copy = min(datalen, sglen);
1804 if (i && page == frags[i - 1].page &&
1805 sgoffset + sg->offset ==
1806 frags[i - 1].offset + frags[i - 1].size) {
1807 frags[i - 1].size += copy;
1808 } else {
1809 if (i >= frag_max) {
1810 pr_warn("too many pages %u, dlen %u.\n",
1811 frag_max, dlen);
1812 return -EINVAL;
1813 }
1814
1815 frags[i].page = page;
1816 frags[i].offset = sg->offset + sgoffset;
1817 frags[i].size = copy;
1818 i++;
1819 }
1820 datalen -= copy;
1821 sgoffset += copy;
1822 sglen -= copy;
1823 } while (datalen);
1824
1825 return i;
1826 }
1827
1828 int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
1829 {
1830 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1831 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1832 struct cxgbi_device *cdev = cconn->chba->cdev;
1833 struct iscsi_conn *conn = task->conn;
1834 struct iscsi_tcp_task *tcp_task = task->dd_data;
1835 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1836 struct scsi_cmnd *sc = task->sc;
1837 int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
1838
1839 tcp_task->dd_data = tdata;
1840 task->hdr = NULL;
1841
1842 if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
1843 (opcode == ISCSI_OP_SCSI_DATA_OUT ||
1844 (opcode == ISCSI_OP_SCSI_CMD &&
1845 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
1846 /* data could goes into skb head */
1847 headroom += min_t(unsigned int,
1848 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
1849 conn->max_xmit_dlength);
1850
1851 tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
1852 if (!tdata->skb) {
1853 struct cxgbi_sock *csk = cconn->cep->csk;
1854 struct net_device *ndev = cdev->ports[csk->port_id];
1855 ndev->stats.tx_dropped++;
1856 return -ENOMEM;
1857 }
1858
1859 skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
1860 task->hdr = (struct iscsi_hdr *)tdata->skb->data;
1861 task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
1862
1863 /* data_out uses scsi_cmd's itt */
1864 if (opcode != ISCSI_OP_SCSI_DATA_OUT)
1865 task_reserve_itt(task, &task->hdr->itt);
1866
1867 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1868 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
1869 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
1870 conn->max_xmit_dlength, ntohl(task->hdr->itt));
1871
1872 return 0;
1873 }
1874 EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
1875
1876 static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
1877 {
1878 if (hcrc || dcrc) {
1879 u8 submode = 0;
1880
1881 if (hcrc)
1882 submode |= 1;
1883 if (dcrc)
1884 submode |= 2;
1885 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
1886 } else
1887 cxgbi_skcb_ulp_mode(skb) = 0;
1888 }
1889
1890 int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
1891 unsigned int count)
1892 {
1893 struct iscsi_conn *conn = task->conn;
1894 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1895 struct sk_buff *skb = tdata->skb;
1896 unsigned int datalen = count;
1897 int i, padlen = iscsi_padding(count);
1898 struct page *pg;
1899
1900 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1901 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
1902 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
1903 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
1904
1905 skb_put(skb, task->hdr_len);
1906 tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
1907 if (!count)
1908 return 0;
1909
1910 if (task->sc) {
1911 struct scsi_data_buffer *sdb = scsi_out(task->sc);
1912 struct scatterlist *sg = NULL;
1913 int err;
1914
1915 tdata->offset = offset;
1916 tdata->count = count;
1917 err = sgl_seek_offset(
1918 sdb->table.sgl, sdb->table.nents,
1919 tdata->offset, &tdata->sgoffset, &sg);
1920 if (err < 0) {
1921 pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
1922 sdb->table.nents, tdata->offset, sdb->length);
1923 return err;
1924 }
1925 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
1926 tdata->frags, MAX_PDU_FRAGS);
1927 if (err < 0) {
1928 pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
1929 sdb->table.nents, tdata->offset, tdata->count);
1930 return err;
1931 }
1932 tdata->nr_frags = err;
1933
1934 if (tdata->nr_frags > MAX_SKB_FRAGS ||
1935 (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
1936 char *dst = skb->data + task->hdr_len;
1937 struct page_frag *frag = tdata->frags;
1938
1939 /* data fits in the skb's headroom */
1940 for (i = 0; i < tdata->nr_frags; i++, frag++) {
1941 char *src = kmap_atomic(frag->page);
1942
1943 memcpy(dst, src+frag->offset, frag->size);
1944 dst += frag->size;
1945 kunmap_atomic(src);
1946 }
1947 if (padlen) {
1948 memset(dst, 0, padlen);
1949 padlen = 0;
1950 }
1951 skb_put(skb, count + padlen);
1952 } else {
1953 /* data fit into frag_list */
1954 for (i = 0; i < tdata->nr_frags; i++) {
1955 __skb_fill_page_desc(skb, i,
1956 tdata->frags[i].page,
1957 tdata->frags[i].offset,
1958 tdata->frags[i].size);
1959 skb_frag_ref(skb, i);
1960 }
1961 skb_shinfo(skb)->nr_frags = tdata->nr_frags;
1962 skb->len += count;
1963 skb->data_len += count;
1964 skb->truesize += count;
1965 }
1966
1967 } else {
1968 pg = virt_to_page(task->data);
1969
1970 get_page(pg);
1971 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
1972 count);
1973 skb->len += count;
1974 skb->data_len += count;
1975 skb->truesize += count;
1976 }
1977
1978 if (padlen) {
1979 i = skb_shinfo(skb)->nr_frags;
1980 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
1981 virt_to_page(padding), offset_in_page(padding),
1982 padlen);
1983
1984 skb->data_len += padlen;
1985 skb->truesize += padlen;
1986 skb->len += padlen;
1987 }
1988
1989 return 0;
1990 }
1991 EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
1992
1993 int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
1994 {
1995 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1996 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1997 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1998 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1999 struct sk_buff *skb = tdata->skb;
2000 struct cxgbi_sock *csk = NULL;
2001 unsigned int datalen;
2002 int err;
2003
2004 if (!skb) {
2005 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2006 "task 0x%p, skb NULL.\n", task);
2007 return 0;
2008 }
2009
2010 if (cconn && cconn->cep)
2011 csk = cconn->cep->csk;
2012 if (!csk) {
2013 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2014 "task 0x%p, csk gone.\n", task);
2015 return -EPIPE;
2016 }
2017
2018 datalen = skb->data_len;
2019 tdata->skb = NULL;
2020
2021 /* write ppod first if using ofldq to write ppod */
2022 if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_VALID) {
2023 struct cxgbi_ppm *ppm = csk->cdev->cdev2ppm(csk->cdev);
2024
2025 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_VALID;
2026 if (csk->cdev->csk_ddp_set_map(ppm, csk, ttinfo) < 0)
2027 pr_err("task 0x%p, ppod writing using ofldq failed.\n",
2028 task);
2029 /* continue. Let fl get the data */
2030 }
2031
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 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2060 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2061 task->itt, skb, skb->len, skb->data_len, err);
2062
2063 kfree_skb(skb);
2064
2065 iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2066 iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2067 return err;
2068 }
2069 EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2070
2071 void cxgbi_cleanup_task(struct iscsi_task *task)
2072 {
2073 struct iscsi_tcp_task *tcp_task = task->dd_data;
2074 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2075
2076 log_debug(1 << CXGBI_DBG_ISCSI,
2077 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2078 task, tdata->skb, task->hdr_itt);
2079
2080 tcp_task->dd_data = NULL;
2081 /* never reached the xmit task callout */
2082 if (tdata->skb)
2083 __kfree_skb(tdata->skb);
2084 memset(tdata, 0, sizeof(*tdata));
2085
2086 task_release_itt(task, task->hdr_itt);
2087 iscsi_tcp_cleanup_task(task);
2088 }
2089 EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2090
2091 void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2092 struct iscsi_stats *stats)
2093 {
2094 struct iscsi_conn *conn = cls_conn->dd_data;
2095
2096 stats->txdata_octets = conn->txdata_octets;
2097 stats->rxdata_octets = conn->rxdata_octets;
2098 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2099 stats->dataout_pdus = conn->dataout_pdus_cnt;
2100 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2101 stats->datain_pdus = conn->datain_pdus_cnt;
2102 stats->r2t_pdus = conn->r2t_pdus_cnt;
2103 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2104 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2105 stats->digest_err = 0;
2106 stats->timeout_err = 0;
2107 stats->custom_length = 1;
2108 strcpy(stats->custom[0].desc, "eh_abort_cnt");
2109 stats->custom[0].value = conn->eh_abort_cnt;
2110 }
2111 EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2112
2113 static int cxgbi_conn_max_xmit_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 struct cxgbi_device *cdev = cconn->chba->cdev;
2118 unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2119 unsigned int max_def = 512 * MAX_SKB_FRAGS;
2120 unsigned int max = max(max_def, headroom);
2121
2122 max = min(cconn->chba->cdev->tx_max_size, max);
2123 if (conn->max_xmit_dlength)
2124 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2125 else
2126 conn->max_xmit_dlength = max;
2127 cxgbi_align_pdu_size(conn->max_xmit_dlength);
2128
2129 return 0;
2130 }
2131
2132 static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2133 {
2134 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2135 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2136 unsigned int max = cconn->chba->cdev->rx_max_size;
2137
2138 cxgbi_align_pdu_size(max);
2139
2140 if (conn->max_recv_dlength) {
2141 if (conn->max_recv_dlength > max) {
2142 pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2143 conn->max_recv_dlength, max);
2144 return -EINVAL;
2145 }
2146 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2147 cxgbi_align_pdu_size(conn->max_recv_dlength);
2148 } else
2149 conn->max_recv_dlength = max;
2150
2151 return 0;
2152 }
2153
2154 int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2155 enum iscsi_param param, char *buf, int buflen)
2156 {
2157 struct iscsi_conn *conn = cls_conn->dd_data;
2158 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2159 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2160 struct cxgbi_sock *csk = cconn->cep->csk;
2161 int err;
2162
2163 log_debug(1 << CXGBI_DBG_ISCSI,
2164 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2165 cls_conn, param, buflen, buf);
2166
2167 switch (param) {
2168 case ISCSI_PARAM_HDRDGST_EN:
2169 err = iscsi_set_param(cls_conn, param, buf, buflen);
2170 if (!err && conn->hdrdgst_en)
2171 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2172 conn->hdrdgst_en,
2173 conn->datadgst_en, 0);
2174 break;
2175 case ISCSI_PARAM_DATADGST_EN:
2176 err = iscsi_set_param(cls_conn, param, buf, buflen);
2177 if (!err && conn->datadgst_en)
2178 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2179 conn->hdrdgst_en,
2180 conn->datadgst_en, 0);
2181 break;
2182 case ISCSI_PARAM_MAX_R2T:
2183 return iscsi_tcp_set_max_r2t(conn, buf);
2184 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2185 err = iscsi_set_param(cls_conn, param, buf, buflen);
2186 if (!err)
2187 err = cxgbi_conn_max_recv_dlength(conn);
2188 break;
2189 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2190 err = iscsi_set_param(cls_conn, param, buf, buflen);
2191 if (!err)
2192 err = cxgbi_conn_max_xmit_dlength(conn);
2193 break;
2194 default:
2195 return iscsi_set_param(cls_conn, param, buf, buflen);
2196 }
2197 return err;
2198 }
2199 EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2200
2201 static inline int csk_print_port(struct cxgbi_sock *csk, char *buf)
2202 {
2203 int len;
2204
2205 cxgbi_sock_get(csk);
2206 len = sprintf(buf, "%hu\n", ntohs(csk->daddr.sin_port));
2207 cxgbi_sock_put(csk);
2208
2209 return len;
2210 }
2211
2212 static inline int csk_print_ip(struct cxgbi_sock *csk, char *buf)
2213 {
2214 int len;
2215
2216 cxgbi_sock_get(csk);
2217 if (csk->csk_family == AF_INET)
2218 len = sprintf(buf, "%pI4",
2219 &csk->daddr.sin_addr.s_addr);
2220 else
2221 len = sprintf(buf, "%pI6",
2222 &csk->daddr6.sin6_addr);
2223
2224 cxgbi_sock_put(csk);
2225
2226 return len;
2227 }
2228
2229 int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2230 char *buf)
2231 {
2232 struct cxgbi_endpoint *cep = ep->dd_data;
2233 struct cxgbi_sock *csk;
2234 int len;
2235
2236 log_debug(1 << CXGBI_DBG_ISCSI,
2237 "cls_conn 0x%p, param %d.\n", ep, param);
2238
2239 switch (param) {
2240 case ISCSI_PARAM_CONN_PORT:
2241 case ISCSI_PARAM_CONN_ADDRESS:
2242 if (!cep)
2243 return -ENOTCONN;
2244
2245 csk = cep->csk;
2246 if (!csk)
2247 return -ENOTCONN;
2248
2249 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2250 &csk->daddr, param, buf);
2251 default:
2252 return -ENOSYS;
2253 }
2254 return len;
2255 }
2256 EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
2257
2258 struct iscsi_cls_conn *
2259 cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2260 {
2261 struct iscsi_cls_conn *cls_conn;
2262 struct iscsi_conn *conn;
2263 struct iscsi_tcp_conn *tcp_conn;
2264 struct cxgbi_conn *cconn;
2265
2266 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2267 if (!cls_conn)
2268 return NULL;
2269
2270 conn = cls_conn->dd_data;
2271 tcp_conn = conn->dd_data;
2272 cconn = tcp_conn->dd_data;
2273 cconn->iconn = conn;
2274
2275 log_debug(1 << CXGBI_DBG_ISCSI,
2276 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2277 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2278
2279 return cls_conn;
2280 }
2281 EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2282
2283 int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2284 struct iscsi_cls_conn *cls_conn,
2285 u64 transport_eph, int is_leading)
2286 {
2287 struct iscsi_conn *conn = cls_conn->dd_data;
2288 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2289 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2290 struct cxgbi_ppm *ppm;
2291 struct iscsi_endpoint *ep;
2292 struct cxgbi_endpoint *cep;
2293 struct cxgbi_sock *csk;
2294 int err;
2295
2296 ep = iscsi_lookup_endpoint(transport_eph);
2297 if (!ep)
2298 return -EINVAL;
2299
2300 /* setup ddp pagesize */
2301 cep = ep->dd_data;
2302 csk = cep->csk;
2303
2304 ppm = csk->cdev->cdev2ppm(csk->cdev);
2305 err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid,
2306 ppm->tformat.pgsz_idx_dflt, 0);
2307 if (err < 0)
2308 return err;
2309
2310 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2311 if (err)
2312 return -EINVAL;
2313
2314 /* calculate the tag idx bits needed for this conn based on cmds_max */
2315 cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2316
2317 write_lock_bh(&csk->callback_lock);
2318 csk->user_data = conn;
2319 cconn->chba = cep->chba;
2320 cconn->cep = cep;
2321 cep->cconn = cconn;
2322 write_unlock_bh(&csk->callback_lock);
2323
2324 cxgbi_conn_max_xmit_dlength(conn);
2325 cxgbi_conn_max_recv_dlength(conn);
2326
2327 log_debug(1 << CXGBI_DBG_ISCSI,
2328 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2329 cls_session, cls_conn, ep, cconn, csk);
2330 /* init recv engine */
2331 iscsi_tcp_hdr_recv_prep(tcp_conn);
2332
2333 return 0;
2334 }
2335 EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2336
2337 struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2338 u16 cmds_max, u16 qdepth,
2339 u32 initial_cmdsn)
2340 {
2341 struct cxgbi_endpoint *cep;
2342 struct cxgbi_hba *chba;
2343 struct Scsi_Host *shost;
2344 struct iscsi_cls_session *cls_session;
2345 struct iscsi_session *session;
2346
2347 if (!ep) {
2348 pr_err("missing endpoint.\n");
2349 return NULL;
2350 }
2351
2352 cep = ep->dd_data;
2353 chba = cep->chba;
2354 shost = chba->shost;
2355
2356 BUG_ON(chba != iscsi_host_priv(shost));
2357
2358 cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2359 cmds_max, 0,
2360 sizeof(struct iscsi_tcp_task) +
2361 sizeof(struct cxgbi_task_data),
2362 initial_cmdsn, ISCSI_MAX_TARGET);
2363 if (!cls_session)
2364 return NULL;
2365
2366 session = cls_session->dd_data;
2367 if (iscsi_tcp_r2tpool_alloc(session))
2368 goto remove_session;
2369
2370 log_debug(1 << CXGBI_DBG_ISCSI,
2371 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2372 return cls_session;
2373
2374 remove_session:
2375 iscsi_session_teardown(cls_session);
2376 return NULL;
2377 }
2378 EXPORT_SYMBOL_GPL(cxgbi_create_session);
2379
2380 void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2381 {
2382 log_debug(1 << CXGBI_DBG_ISCSI,
2383 "cls sess 0x%p.\n", cls_session);
2384
2385 iscsi_tcp_r2tpool_free(cls_session->dd_data);
2386 iscsi_session_teardown(cls_session);
2387 }
2388 EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2389
2390 int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2391 char *buf, int buflen)
2392 {
2393 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2394
2395 if (!chba->ndev) {
2396 shost_printk(KERN_ERR, shost, "Could not get host param. "
2397 "netdev for host not set.\n");
2398 return -ENODEV;
2399 }
2400
2401 log_debug(1 << CXGBI_DBG_ISCSI,
2402 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2403 shost, chba, chba->ndev->name, param, buflen, buf);
2404
2405 switch (param) {
2406 case ISCSI_HOST_PARAM_IPADDRESS:
2407 {
2408 __be32 addr = in_aton(buf);
2409 log_debug(1 << CXGBI_DBG_ISCSI,
2410 "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2411 cxgbi_set_iscsi_ipv4(chba, addr);
2412 return 0;
2413 }
2414 case ISCSI_HOST_PARAM_HWADDRESS:
2415 case ISCSI_HOST_PARAM_NETDEV_NAME:
2416 return 0;
2417 default:
2418 return iscsi_host_set_param(shost, param, buf, buflen);
2419 }
2420 }
2421 EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2422
2423 int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2424 char *buf)
2425 {
2426 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2427 int len = 0;
2428
2429 if (!chba->ndev) {
2430 shost_printk(KERN_ERR, shost, "Could not get host param. "
2431 "netdev for host not set.\n");
2432 return -ENODEV;
2433 }
2434
2435 log_debug(1 << CXGBI_DBG_ISCSI,
2436 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2437 shost, chba, chba->ndev->name, param);
2438
2439 switch (param) {
2440 case ISCSI_HOST_PARAM_HWADDRESS:
2441 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2442 break;
2443 case ISCSI_HOST_PARAM_NETDEV_NAME:
2444 len = sprintf(buf, "%s\n", chba->ndev->name);
2445 break;
2446 case ISCSI_HOST_PARAM_IPADDRESS:
2447 {
2448 struct cxgbi_sock *csk = find_sock_on_port(chba->cdev,
2449 chba->port_id);
2450 if (csk) {
2451 len = sprintf(buf, "%pIS",
2452 (struct sockaddr *)&csk->saddr);
2453 }
2454 log_debug(1 << CXGBI_DBG_ISCSI,
2455 "hba %s, addr %s.\n", chba->ndev->name, buf);
2456 break;
2457 }
2458 default:
2459 return iscsi_host_get_param(shost, param, buf);
2460 }
2461
2462 return len;
2463 }
2464 EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2465
2466 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2467 struct sockaddr *dst_addr,
2468 int non_blocking)
2469 {
2470 struct iscsi_endpoint *ep;
2471 struct cxgbi_endpoint *cep;
2472 struct cxgbi_hba *hba = NULL;
2473 struct cxgbi_sock *csk;
2474 int err = -EINVAL;
2475
2476 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2477 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2478 shost, non_blocking, dst_addr);
2479
2480 if (shost) {
2481 hba = iscsi_host_priv(shost);
2482 if (!hba) {
2483 pr_info("shost 0x%p, priv NULL.\n", shost);
2484 goto err_out;
2485 }
2486 }
2487
2488 if (dst_addr->sa_family == AF_INET) {
2489 csk = cxgbi_check_route(dst_addr);
2490 #if IS_ENABLED(CONFIG_IPV6)
2491 } else if (dst_addr->sa_family == AF_INET6) {
2492 csk = cxgbi_check_route6(dst_addr);
2493 #endif
2494 } else {
2495 pr_info("address family 0x%x NOT supported.\n",
2496 dst_addr->sa_family);
2497 err = -EAFNOSUPPORT;
2498 return (struct iscsi_endpoint *)ERR_PTR(err);
2499 }
2500
2501 if (IS_ERR(csk))
2502 return (struct iscsi_endpoint *)csk;
2503 cxgbi_sock_get(csk);
2504
2505 if (!hba)
2506 hba = csk->cdev->hbas[csk->port_id];
2507 else if (hba != csk->cdev->hbas[csk->port_id]) {
2508 pr_info("Could not connect through requested host %u"
2509 "hba 0x%p != 0x%p (%u).\n",
2510 shost->host_no, hba,
2511 csk->cdev->hbas[csk->port_id], csk->port_id);
2512 err = -ENOSPC;
2513 goto release_conn;
2514 }
2515
2516 err = sock_get_port(csk);
2517 if (err)
2518 goto release_conn;
2519
2520 cxgbi_sock_set_state(csk, CTP_CONNECTING);
2521 err = csk->cdev->csk_init_act_open(csk);
2522 if (err)
2523 goto release_conn;
2524
2525 if (cxgbi_sock_is_closing(csk)) {
2526 err = -ENOSPC;
2527 pr_info("csk 0x%p is closing.\n", csk);
2528 goto release_conn;
2529 }
2530
2531 ep = iscsi_create_endpoint(sizeof(*cep));
2532 if (!ep) {
2533 err = -ENOMEM;
2534 pr_info("iscsi alloc ep, OOM.\n");
2535 goto release_conn;
2536 }
2537
2538 cep = ep->dd_data;
2539 cep->csk = csk;
2540 cep->chba = hba;
2541
2542 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2543 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2544 ep, cep, csk, hba, hba->ndev->name);
2545 return ep;
2546
2547 release_conn:
2548 cxgbi_sock_put(csk);
2549 cxgbi_sock_closed(csk);
2550 err_out:
2551 return ERR_PTR(err);
2552 }
2553 EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2554
2555 int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2556 {
2557 struct cxgbi_endpoint *cep = ep->dd_data;
2558 struct cxgbi_sock *csk = cep->csk;
2559
2560 if (!cxgbi_sock_is_established(csk))
2561 return 0;
2562 return 1;
2563 }
2564 EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2565
2566 void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2567 {
2568 struct cxgbi_endpoint *cep = ep->dd_data;
2569 struct cxgbi_conn *cconn = cep->cconn;
2570 struct cxgbi_sock *csk = cep->csk;
2571
2572 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2573 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2574 ep, cep, cconn, csk, csk->state, csk->flags);
2575
2576 if (cconn && cconn->iconn) {
2577 iscsi_suspend_tx(cconn->iconn);
2578 write_lock_bh(&csk->callback_lock);
2579 cep->csk->user_data = NULL;
2580 cconn->cep = NULL;
2581 write_unlock_bh(&csk->callback_lock);
2582 }
2583 iscsi_destroy_endpoint(ep);
2584
2585 if (likely(csk->state >= CTP_ESTABLISHED))
2586 need_active_close(csk);
2587 else
2588 cxgbi_sock_closed(csk);
2589
2590 cxgbi_sock_put(csk);
2591 }
2592 EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2593
2594 int cxgbi_iscsi_init(struct iscsi_transport *itp,
2595 struct scsi_transport_template **stt)
2596 {
2597 *stt = iscsi_register_transport(itp);
2598 if (*stt == NULL) {
2599 pr_err("unable to register %s transport 0x%p.\n",
2600 itp->name, itp);
2601 return -ENODEV;
2602 }
2603 log_debug(1 << CXGBI_DBG_ISCSI,
2604 "%s, registered iscsi transport 0x%p.\n",
2605 itp->name, stt);
2606 return 0;
2607 }
2608 EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2609
2610 void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2611 struct scsi_transport_template **stt)
2612 {
2613 if (*stt) {
2614 log_debug(1 << CXGBI_DBG_ISCSI,
2615 "de-register transport 0x%p, %s, stt 0x%p.\n",
2616 itp, itp->name, *stt);
2617 *stt = NULL;
2618 iscsi_unregister_transport(itp);
2619 }
2620 }
2621 EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2622
2623 umode_t cxgbi_attr_is_visible(int param_type, int param)
2624 {
2625 switch (param_type) {
2626 case ISCSI_HOST_PARAM:
2627 switch (param) {
2628 case ISCSI_HOST_PARAM_NETDEV_NAME:
2629 case ISCSI_HOST_PARAM_HWADDRESS:
2630 case ISCSI_HOST_PARAM_IPADDRESS:
2631 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2632 return S_IRUGO;
2633 default:
2634 return 0;
2635 }
2636 case ISCSI_PARAM:
2637 switch (param) {
2638 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2639 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2640 case ISCSI_PARAM_HDRDGST_EN:
2641 case ISCSI_PARAM_DATADGST_EN:
2642 case ISCSI_PARAM_CONN_ADDRESS:
2643 case ISCSI_PARAM_CONN_PORT:
2644 case ISCSI_PARAM_EXP_STATSN:
2645 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2646 case ISCSI_PARAM_PERSISTENT_PORT:
2647 case ISCSI_PARAM_PING_TMO:
2648 case ISCSI_PARAM_RECV_TMO:
2649 case ISCSI_PARAM_INITIAL_R2T_EN:
2650 case ISCSI_PARAM_MAX_R2T:
2651 case ISCSI_PARAM_IMM_DATA_EN:
2652 case ISCSI_PARAM_FIRST_BURST:
2653 case ISCSI_PARAM_MAX_BURST:
2654 case ISCSI_PARAM_PDU_INORDER_EN:
2655 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2656 case ISCSI_PARAM_ERL:
2657 case ISCSI_PARAM_TARGET_NAME:
2658 case ISCSI_PARAM_TPGT:
2659 case ISCSI_PARAM_USERNAME:
2660 case ISCSI_PARAM_PASSWORD:
2661 case ISCSI_PARAM_USERNAME_IN:
2662 case ISCSI_PARAM_PASSWORD_IN:
2663 case ISCSI_PARAM_FAST_ABORT:
2664 case ISCSI_PARAM_ABORT_TMO:
2665 case ISCSI_PARAM_LU_RESET_TMO:
2666 case ISCSI_PARAM_TGT_RESET_TMO:
2667 case ISCSI_PARAM_IFACE_NAME:
2668 case ISCSI_PARAM_INITIATOR_NAME:
2669 return S_IRUGO;
2670 default:
2671 return 0;
2672 }
2673 }
2674
2675 return 0;
2676 }
2677 EXPORT_SYMBOL_GPL(cxgbi_attr_is_visible);
2678
2679 static int __init libcxgbi_init_module(void)
2680 {
2681 pr_info("%s", version);
2682 return 0;
2683 }
2684
2685 static void __exit libcxgbi_exit_module(void)
2686 {
2687 cxgbi_device_unregister_all(0xFF);
2688 return;
2689 }
2690
2691 module_init(libcxgbi_init_module);
2692 module_exit(libcxgbi_exit_module);
Linux with added FPC-III support