?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Linux 5.1.15
[linux/fpc-iii.git] / drivers / scsi / cxgbi / libcxgbi.c
bloba50734f3c486ff3df3a537f6e8262023ffd12e0b
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 (is_vlan_dev(ndev)) {
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 (is_vlan_dev(ndev)) {
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 (is_vlan_dev(ndev)) {
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 timer_setup(&csk->retry_timer, NULL, 0);
576 init_completion(&csk->cmpl);
577 rwlock_init(&csk->callback_lock);
578 csk->cdev = cdev;
579 csk->flags = 0;
580 cxgbi_sock_set_state(csk, CTP_CLOSED);
581
582 log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk);
583
584 return csk;
585 }
586
587 static struct rtable *find_route_ipv4(struct flowi4 *fl4,
588 __be32 saddr, __be32 daddr,
589 __be16 sport, __be16 dport, u8 tos,
590 int ifindex)
591 {
592 struct rtable *rt;
593
594 rt = ip_route_output_ports(&init_net, fl4, NULL, daddr, saddr,
595 dport, sport, IPPROTO_TCP, tos, ifindex);
596 if (IS_ERR(rt))
597 return NULL;
598
599 return rt;
600 }
601
602 static struct cxgbi_sock *
603 cxgbi_check_route(struct sockaddr *dst_addr, int ifindex)
604 {
605 struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
606 struct dst_entry *dst;
607 struct net_device *ndev;
608 struct cxgbi_device *cdev;
609 struct rtable *rt = NULL;
610 struct neighbour *n;
611 struct flowi4 fl4;
612 struct cxgbi_sock *csk = NULL;
613 unsigned int mtu = 0;
614 int port = 0xFFFF;
615 int err = 0;
616
617 rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0,
618 daddr->sin_port, 0, ifindex);
619 if (!rt) {
620 pr_info("no route to ipv4 0x%x, port %u.\n",
621 be32_to_cpu(daddr->sin_addr.s_addr),
622 be16_to_cpu(daddr->sin_port));
623 err = -ENETUNREACH;
624 goto err_out;
625 }
626 dst = &rt->dst;
627 n = dst_neigh_lookup(dst, &daddr->sin_addr.s_addr);
628 if (!n) {
629 err = -ENODEV;
630 goto rel_rt;
631 }
632 ndev = n->dev;
633
634 if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
635 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
636 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
637 ndev->name);
638 err = -ENETUNREACH;
639 goto rel_neigh;
640 }
641
642 if (ndev->flags & IFF_LOOPBACK) {
643 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
644 if (!ndev) {
645 err = -ENETUNREACH;
646 goto rel_neigh;
647 }
648 mtu = ndev->mtu;
649 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
650 n->dev->name, ndev->name, mtu);
651 }
652
653 if (!(ndev->flags & IFF_UP) || !netif_carrier_ok(ndev)) {
654 pr_info("%s interface not up.\n", ndev->name);
655 err = -ENETDOWN;
656 goto rel_neigh;
657 }
658
659 cdev = cxgbi_device_find_by_netdev(ndev, &port);
660 if (!cdev) {
661 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
662 &daddr->sin_addr.s_addr, ndev->name);
663 err = -ENETUNREACH;
664 goto rel_neigh;
665 }
666 log_debug(1 << CXGBI_DBG_SOCK,
667 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
668 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
669 port, ndev->name, cdev);
670
671 csk = cxgbi_sock_create(cdev);
672 if (!csk) {
673 err = -ENOMEM;
674 goto rel_neigh;
675 }
676 csk->cdev = cdev;
677 csk->port_id = port;
678 csk->mtu = mtu;
679 csk->dst = dst;
680
681 csk->csk_family = AF_INET;
682 csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
683 csk->daddr.sin_port = daddr->sin_port;
684 csk->daddr.sin_family = daddr->sin_family;
685 csk->saddr.sin_family = daddr->sin_family;
686 csk->saddr.sin_addr.s_addr = fl4.saddr;
687 neigh_release(n);
688
689 return csk;
690
691 rel_neigh:
692 neigh_release(n);
693
694 rel_rt:
695 ip_rt_put(rt);
696 err_out:
697 return ERR_PTR(err);
698 }
699
700 #if IS_ENABLED(CONFIG_IPV6)
701 static struct rt6_info *find_route_ipv6(const struct in6_addr *saddr,
702 const struct in6_addr *daddr,
703 int ifindex)
704 {
705 struct flowi6 fl;
706
707 memset(&fl, 0, sizeof(fl));
708 fl.flowi6_oif = ifindex;
709 if (saddr)
710 memcpy(&fl.saddr, saddr, sizeof(struct in6_addr));
711 if (daddr)
712 memcpy(&fl.daddr, daddr, sizeof(struct in6_addr));
713 return (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl);
714 }
715
716 static struct cxgbi_sock *
717 cxgbi_check_route6(struct sockaddr *dst_addr, int ifindex)
718 {
719 struct sockaddr_in6 *daddr6 = (struct sockaddr_in6 *)dst_addr;
720 struct dst_entry *dst;
721 struct net_device *ndev;
722 struct cxgbi_device *cdev;
723 struct rt6_info *rt = NULL;
724 struct neighbour *n;
725 struct in6_addr pref_saddr;
726 struct cxgbi_sock *csk = NULL;
727 unsigned int mtu = 0;
728 int port = 0xFFFF;
729 int err = 0;
730
731 rt = find_route_ipv6(NULL, &daddr6->sin6_addr, ifindex);
732
733 if (!rt) {
734 pr_info("no route to ipv6 %pI6 port %u\n",
735 daddr6->sin6_addr.s6_addr,
736 be16_to_cpu(daddr6->sin6_port));
737 err = -ENETUNREACH;
738 goto err_out;
739 }
740
741 dst = &rt->dst;
742
743 n = dst_neigh_lookup(dst, &daddr6->sin6_addr);
744
745 if (!n) {
746 pr_info("%pI6, port %u, dst no neighbour.\n",
747 daddr6->sin6_addr.s6_addr,
748 be16_to_cpu(daddr6->sin6_port));
749 err = -ENETUNREACH;
750 goto rel_rt;
751 }
752 ndev = n->dev;
753
754 if (!(ndev->flags & IFF_UP) || !netif_carrier_ok(ndev)) {
755 pr_info("%s interface not up.\n", ndev->name);
756 err = -ENETDOWN;
757 goto rel_rt;
758 }
759
760 if (ipv6_addr_is_multicast(&daddr6->sin6_addr)) {
761 pr_info("multi-cast route %pI6 port %u, dev %s.\n",
762 daddr6->sin6_addr.s6_addr,
763 ntohs(daddr6->sin6_port), ndev->name);
764 err = -ENETUNREACH;
765 goto rel_rt;
766 }
767
768 cdev = cxgbi_device_find_by_netdev(ndev, &port);
769 if (!cdev)
770 cdev = cxgbi_device_find_by_mac(ndev, &port);
771 if (!cdev) {
772 pr_info("dst %pI6 %s, NOT cxgbi device.\n",
773 daddr6->sin6_addr.s6_addr, ndev->name);
774 err = -ENETUNREACH;
775 goto rel_rt;
776 }
777 log_debug(1 << CXGBI_DBG_SOCK,
778 "route to %pI6 :%u, ndev p#%d,%s, cdev 0x%p.\n",
779 daddr6->sin6_addr.s6_addr, ntohs(daddr6->sin6_port), port,
780 ndev->name, cdev);
781
782 csk = cxgbi_sock_create(cdev);
783 if (!csk) {
784 err = -ENOMEM;
785 goto rel_rt;
786 }
787 csk->cdev = cdev;
788 csk->port_id = port;
789 csk->mtu = mtu;
790 csk->dst = dst;
791
792 rt6_get_prefsrc(rt, &pref_saddr);
793 if (ipv6_addr_any(&pref_saddr)) {
794 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry *)rt);
795
796 err = ipv6_dev_get_saddr(&init_net, idev ? idev->dev : NULL,
797 &daddr6->sin6_addr, 0, &pref_saddr);
798 if (err) {
799 pr_info("failed to get source address to reach %pI6\n",
800 &daddr6->sin6_addr);
801 goto rel_rt;
802 }
803 }
804
805 csk->csk_family = AF_INET6;
806 csk->daddr6.sin6_addr = daddr6->sin6_addr;
807 csk->daddr6.sin6_port = daddr6->sin6_port;
808 csk->daddr6.sin6_family = daddr6->sin6_family;
809 csk->saddr6.sin6_family = daddr6->sin6_family;
810 csk->saddr6.sin6_addr = pref_saddr;
811
812 neigh_release(n);
813 return csk;
814
815 rel_rt:
816 if (n)
817 neigh_release(n);
818
819 ip6_rt_put(rt);
820 if (csk)
821 cxgbi_sock_closed(csk);
822 err_out:
823 return ERR_PTR(err);
824 }
825 #endif /* IS_ENABLED(CONFIG_IPV6) */
826
827 void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
828 unsigned int opt)
829 {
830 csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
831 dst_confirm(csk->dst);
832 smp_mb();
833 cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
834 }
835 EXPORT_SYMBOL_GPL(cxgbi_sock_established);
836
837 static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
838 {
839 log_debug(1 << CXGBI_DBG_SOCK,
840 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
841 csk, csk->state, csk->flags, csk->user_data);
842
843 if (csk->state != CTP_ESTABLISHED) {
844 read_lock_bh(&csk->callback_lock);
845 if (csk->user_data)
846 iscsi_conn_failure(csk->user_data,
847 ISCSI_ERR_TCP_CONN_CLOSE);
848 read_unlock_bh(&csk->callback_lock);
849 }
850 }
851
852 void cxgbi_sock_closed(struct cxgbi_sock *csk)
853 {
854 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
855 csk, (csk)->state, (csk)->flags, (csk)->tid);
856 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
857 if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
858 return;
859 if (csk->saddr.sin_port)
860 sock_put_port(csk);
861 if (csk->dst)
862 dst_release(csk->dst);
863 csk->cdev->csk_release_offload_resources(csk);
864 cxgbi_sock_set_state(csk, CTP_CLOSED);
865 cxgbi_inform_iscsi_conn_closing(csk);
866 cxgbi_sock_put(csk);
867 }
868 EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
869
870 static void need_active_close(struct cxgbi_sock *csk)
871 {
872 int data_lost;
873 int close_req = 0;
874
875 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
876 csk, (csk)->state, (csk)->flags, (csk)->tid);
877 spin_lock_bh(&csk->lock);
878 if (csk->dst)
879 dst_confirm(csk->dst);
880 data_lost = skb_queue_len(&csk->receive_queue);
881 __skb_queue_purge(&csk->receive_queue);
882
883 if (csk->state == CTP_ACTIVE_OPEN)
884 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
885 else if (csk->state == CTP_ESTABLISHED) {
886 close_req = 1;
887 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
888 } else if (csk->state == CTP_PASSIVE_CLOSE) {
889 close_req = 1;
890 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
891 }
892
893 if (close_req) {
894 if (!cxgbi_sock_flag(csk, CTPF_LOGOUT_RSP_RCVD) ||
895 data_lost)
896 csk->cdev->csk_send_abort_req(csk);
897 else
898 csk->cdev->csk_send_close_req(csk);
899 }
900
901 spin_unlock_bh(&csk->lock);
902 }
903
904 void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
905 {
906 pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
907 csk, csk->state, csk->flags,
908 &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
909 &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
910 errno);
911
912 cxgbi_sock_set_state(csk, CTP_CONNECTING);
913 csk->err = errno;
914 cxgbi_sock_closed(csk);
915 }
916 EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
917
918 void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
919 {
920 struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
921 struct module *owner = csk->cdev->owner;
922
923 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
924 csk, (csk)->state, (csk)->flags, (csk)->tid);
925 cxgbi_sock_get(csk);
926 spin_lock_bh(&csk->lock);
927 if (csk->state == CTP_ACTIVE_OPEN)
928 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
929 spin_unlock_bh(&csk->lock);
930 cxgbi_sock_put(csk);
931 __kfree_skb(skb);
932
933 module_put(owner);
934 }
935 EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
936
937 void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
938 {
939 cxgbi_sock_get(csk);
940 spin_lock_bh(&csk->lock);
941
942 cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
943 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
944 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
945 if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
946 pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
947 csk, csk->state, csk->flags, csk->tid);
948 cxgbi_sock_closed(csk);
949 }
950
951 spin_unlock_bh(&csk->lock);
952 cxgbi_sock_put(csk);
953 }
954 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
955
956 void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
957 {
958 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
959 csk, (csk)->state, (csk)->flags, (csk)->tid);
960 cxgbi_sock_get(csk);
961 spin_lock_bh(&csk->lock);
962
963 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
964 goto done;
965
966 switch (csk->state) {
967 case CTP_ESTABLISHED:
968 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
969 break;
970 case CTP_ACTIVE_CLOSE:
971 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
972 break;
973 case CTP_CLOSE_WAIT_1:
974 cxgbi_sock_closed(csk);
975 break;
976 case CTP_ABORTING:
977 break;
978 default:
979 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
980 csk, csk->state, csk->flags, csk->tid);
981 }
982 cxgbi_inform_iscsi_conn_closing(csk);
983 done:
984 spin_unlock_bh(&csk->lock);
985 cxgbi_sock_put(csk);
986 }
987 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
988
989 void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
990 {
991 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
992 csk, (csk)->state, (csk)->flags, (csk)->tid);
993 cxgbi_sock_get(csk);
994 spin_lock_bh(&csk->lock);
995
996 csk->snd_una = snd_nxt - 1;
997 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
998 goto done;
999
1000 switch (csk->state) {
1001 case CTP_ACTIVE_CLOSE:
1002 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
1003 break;
1004 case CTP_CLOSE_WAIT_1:
1005 case CTP_CLOSE_WAIT_2:
1006 cxgbi_sock_closed(csk);
1007 break;
1008 case CTP_ABORTING:
1009 break;
1010 default:
1011 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
1012 csk, csk->state, csk->flags, csk->tid);
1013 }
1014 done:
1015 spin_unlock_bh(&csk->lock);
1016 cxgbi_sock_put(csk);
1017 }
1018 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
1019
1020 void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
1021 unsigned int snd_una, int seq_chk)
1022 {
1023 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1024 "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
1025 csk, csk->state, csk->flags, csk->tid, credits,
1026 csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
1027
1028 spin_lock_bh(&csk->lock);
1029
1030 csk->wr_cred += credits;
1031 if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
1032 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
1033
1034 while (credits) {
1035 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
1036
1037 if (unlikely(!p)) {
1038 pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
1039 csk, csk->state, csk->flags, csk->tid, credits,
1040 csk->wr_cred, csk->wr_una_cred);
1041 break;
1042 }
1043
1044 if (unlikely(credits < p->csum)) {
1045 pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
1046 csk, csk->state, csk->flags, csk->tid,
1047 credits, csk->wr_cred, csk->wr_una_cred,
1048 p->csum);
1049 p->csum -= credits;
1050 break;
1051 } else {
1052 cxgbi_sock_dequeue_wr(csk);
1053 credits -= p->csum;
1054 kfree_skb(p);
1055 }
1056 }
1057
1058 cxgbi_sock_check_wr_invariants(csk);
1059
1060 if (seq_chk) {
1061 if (unlikely(before(snd_una, csk->snd_una))) {
1062 pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
1063 csk, csk->state, csk->flags, csk->tid, snd_una,
1064 csk->snd_una);
1065 goto done;
1066 }
1067
1068 if (csk->snd_una != snd_una) {
1069 csk->snd_una = snd_una;
1070 dst_confirm(csk->dst);
1071 }
1072 }
1073
1074 if (skb_queue_len(&csk->write_queue)) {
1075 if (csk->cdev->csk_push_tx_frames(csk, 0))
1076 cxgbi_conn_tx_open(csk);
1077 } else
1078 cxgbi_conn_tx_open(csk);
1079 done:
1080 spin_unlock_bh(&csk->lock);
1081 }
1082 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
1083
1084 static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
1085 unsigned short mtu)
1086 {
1087 int i = 0;
1088
1089 while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
1090 ++i;
1091
1092 return i;
1093 }
1094
1095 unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
1096 {
1097 unsigned int idx;
1098 struct dst_entry *dst = csk->dst;
1099
1100 csk->advmss = dst_metric_advmss(dst);
1101
1102 if (csk->advmss > pmtu - 40)
1103 csk->advmss = pmtu - 40;
1104 if (csk->advmss < csk->cdev->mtus[0] - 40)
1105 csk->advmss = csk->cdev->mtus[0] - 40;
1106 idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
1107
1108 return idx;
1109 }
1110 EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
1111
1112 void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
1113 {
1114 cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
1115 __skb_queue_tail(&csk->write_queue, skb);
1116 }
1117 EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
1118
1119 void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
1120 {
1121 struct sk_buff *skb;
1122
1123 while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
1124 kfree_skb(skb);
1125 }
1126 EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
1127
1128 void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
1129 {
1130 int pending = cxgbi_sock_count_pending_wrs(csk);
1131
1132 if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
1133 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
1134 csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
1135 }
1136 EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
1137
1138 static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
1139 {
1140 struct cxgbi_device *cdev = csk->cdev;
1141 struct sk_buff *next;
1142 int err, copied = 0;
1143
1144 spin_lock_bh(&csk->lock);
1145
1146 if (csk->state != CTP_ESTABLISHED) {
1147 log_debug(1 << CXGBI_DBG_PDU_TX,
1148 "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
1149 csk, csk->state, csk->flags, csk->tid);
1150 err = -EAGAIN;
1151 goto out_err;
1152 }
1153
1154 if (csk->err) {
1155 log_debug(1 << CXGBI_DBG_PDU_TX,
1156 "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
1157 csk, csk->state, csk->flags, csk->tid, csk->err);
1158 err = -EPIPE;
1159 goto out_err;
1160 }
1161
1162 if (csk->write_seq - csk->snd_una >= csk->snd_win) {
1163 log_debug(1 << CXGBI_DBG_PDU_TX,
1164 "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
1165 csk, csk->state, csk->flags, csk->tid, csk->write_seq,
1166 csk->snd_una, csk->snd_win);
1167 err = -ENOBUFS;
1168 goto out_err;
1169 }
1170
1171 while (skb) {
1172 int frags = skb_shinfo(skb)->nr_frags +
1173 (skb->len != skb->data_len);
1174
1175 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
1176 pr_err("csk 0x%p, skb head %u < %u.\n",
1177 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
1178 err = -EINVAL;
1179 goto out_err;
1180 }
1181
1182 if (frags >= SKB_WR_LIST_SIZE) {
1183 pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
1184 csk, skb_shinfo(skb)->nr_frags, skb->len,
1185 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
1186 err = -EINVAL;
1187 goto out_err;
1188 }
1189
1190 next = skb->next;
1191 skb->next = NULL;
1192 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
1193 cxgbi_sock_skb_entail(csk, skb);
1194 copied += skb->len;
1195 csk->write_seq += skb->len +
1196 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
1197 skb = next;
1198 }
1199
1200 if (likely(skb_queue_len(&csk->write_queue)))
1201 cdev->csk_push_tx_frames(csk, 1);
1202 done:
1203 spin_unlock_bh(&csk->lock);
1204 return copied;
1205
1206 out_err:
1207 if (copied == 0 && err == -EPIPE)
1208 copied = csk->err ? csk->err : -EPIPE;
1209 else
1210 copied = err;
1211 goto done;
1212 }
1213
1214 static inline void
1215 scmd_get_params(struct scsi_cmnd *sc, struct scatterlist **sgl,
1216 unsigned int *sgcnt, unsigned int *dlen,
1217 unsigned int prot)
1218 {
1219 struct scsi_data_buffer *sdb = prot ? scsi_prot(sc) : &sc->sdb;
1220
1221 *sgl = sdb->table.sgl;
1222 *sgcnt = sdb->table.nents;
1223 *dlen = sdb->length;
1224 /* Caution: for protection sdb, sdb->length is invalid */
1225 }
1226
1227 void cxgbi_ddp_set_one_ppod(struct cxgbi_pagepod *ppod,
1228 struct cxgbi_task_tag_info *ttinfo,
1229 struct scatterlist **sg_pp, unsigned int *sg_off)
1230 {
1231 struct scatterlist *sg = sg_pp ? *sg_pp : NULL;
1232 unsigned int offset = sg_off ? *sg_off : 0;
1233 dma_addr_t addr = 0UL;
1234 unsigned int len = 0;
1235 int i;
1236
1237 memcpy(ppod, &ttinfo->hdr, sizeof(struct cxgbi_pagepod_hdr));
1238
1239 if (sg) {
1240 addr = sg_dma_address(sg);
1241 len = sg_dma_len(sg);
1242 }
1243
1244 for (i = 0; i < PPOD_PAGES_MAX; i++) {
1245 if (sg) {
1246 ppod->addr[i] = cpu_to_be64(addr + offset);
1247 offset += PAGE_SIZE;
1248 if (offset == (len + sg->offset)) {
1249 offset = 0;
1250 sg = sg_next(sg);
1251 if (sg) {
1252 addr = sg_dma_address(sg);
1253 len = sg_dma_len(sg);
1254 }
1255 }
1256 } else {
1257 ppod->addr[i] = 0ULL;
1258 }
1259 }
1260
1261 /*
1262 * the fifth address needs to be repeated in the next ppod, so do
1263 * not move sg
1264 */
1265 if (sg_pp) {
1266 *sg_pp = sg;
1267 *sg_off = offset;
1268 }
1269
1270 if (offset == len) {
1271 offset = 0;
1272 sg = sg_next(sg);
1273 if (sg) {
1274 addr = sg_dma_address(sg);
1275 len = sg_dma_len(sg);
1276 }
1277 }
1278 ppod->addr[i] = sg ? cpu_to_be64(addr + offset) : 0ULL;
1279 }
1280 EXPORT_SYMBOL_GPL(cxgbi_ddp_set_one_ppod);
1281
1282 /*
1283 * APIs interacting with open-iscsi libraries
1284 */
1285
1286 static unsigned char padding[4];
1287
1288 void cxgbi_ddp_ppm_setup(void **ppm_pp, struct cxgbi_device *cdev,
1289 struct cxgbi_tag_format *tformat, unsigned int ppmax,
1290 unsigned int llimit, unsigned int start,
1291 unsigned int rsvd_factor)
1292 {
1293 int err = cxgbi_ppm_init(ppm_pp, cdev->ports[0], cdev->pdev,
1294 cdev->lldev, tformat, ppmax, llimit, start,
1295 rsvd_factor);
1296
1297 if (err >= 0) {
1298 struct cxgbi_ppm *ppm = (struct cxgbi_ppm *)(*ppm_pp);
1299
1300 if (ppm->ppmax < 1024 ||
1301 ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX)
1302 cdev->flags |= CXGBI_FLAG_DDP_OFF;
1303 err = 0;
1304 } else {
1305 cdev->flags |= CXGBI_FLAG_DDP_OFF;
1306 }
1307 }
1308 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppm_setup);
1309
1310 static int cxgbi_ddp_sgl_check(struct scatterlist *sgl, int nents)
1311 {
1312 int i;
1313 int last_sgidx = nents - 1;
1314 struct scatterlist *sg = sgl;
1315
1316 for (i = 0; i < nents; i++, sg = sg_next(sg)) {
1317 unsigned int len = sg->length + sg->offset;
1318
1319 if ((sg->offset & 0x3) || (i && sg->offset) ||
1320 ((i != last_sgidx) && len != PAGE_SIZE)) {
1321 log_debug(1 << CXGBI_DBG_DDP,
1322 "sg %u/%u, %u,%u, not aligned.\n",
1323 i, nents, sg->offset, sg->length);
1324 goto err_out;
1325 }
1326 }
1327 return 0;
1328 err_out:
1329 return -EINVAL;
1330 }
1331
1332 static int cxgbi_ddp_reserve(struct cxgbi_conn *cconn,
1333 struct cxgbi_task_data *tdata, u32 sw_tag,
1334 unsigned int xferlen)
1335 {
1336 struct cxgbi_sock *csk = cconn->cep->csk;
1337 struct cxgbi_device *cdev = csk->cdev;
1338 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1339 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1340 struct scatterlist *sgl = ttinfo->sgl;
1341 unsigned int sgcnt = ttinfo->nents;
1342 unsigned int sg_offset = sgl->offset;
1343 int err;
1344
1345 if (cdev->flags & CXGBI_FLAG_DDP_OFF) {
1346 log_debug(1 << CXGBI_DBG_DDP,
1347 "cdev 0x%p DDP off.\n", cdev);
1348 return -EINVAL;
1349 }
1350
1351 if (!ppm || xferlen < DDP_THRESHOLD || !sgcnt ||
1352 ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX) {
1353 log_debug(1 << CXGBI_DBG_DDP,
1354 "ppm 0x%p, pgidx %u, xfer %u, sgcnt %u, NO ddp.\n",
1355 ppm, ppm ? ppm->tformat.pgsz_idx_dflt : DDP_PGIDX_MAX,
1356 xferlen, ttinfo->nents);
1357 return -EINVAL;
1358 }
1359
1360 /* make sure the buffer is suitable for ddp */
1361 if (cxgbi_ddp_sgl_check(sgl, sgcnt) < 0)
1362 return -EINVAL;
1363
1364 ttinfo->nr_pages = (xferlen + sgl->offset + (1 << PAGE_SHIFT) - 1) >>
1365 PAGE_SHIFT;
1366
1367 /*
1368 * the ddp tag will be used for the itt in the outgoing pdu,
1369 * the itt genrated by libiscsi is saved in the ppm and can be
1370 * retrieved via the ddp tag
1371 */
1372 err = cxgbi_ppm_ppods_reserve(ppm, ttinfo->nr_pages, 0, &ttinfo->idx,
1373 &ttinfo->tag, (unsigned long)sw_tag);
1374 if (err < 0) {
1375 cconn->ddp_full++;
1376 return err;
1377 }
1378 ttinfo->npods = err;
1379
1380 /* setup dma from scsi command sgl */
1381 sgl->offset = 0;
1382 err = dma_map_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1383 sgl->offset = sg_offset;
1384 if (err == 0) {
1385 pr_info("%s: 0x%x, xfer %u, sgl %u dma mapping err.\n",
1386 __func__, sw_tag, xferlen, sgcnt);
1387 goto rel_ppods;
1388 }
1389 if (err != ttinfo->nr_pages) {
1390 log_debug(1 << CXGBI_DBG_DDP,
1391 "%s: sw tag 0x%x, xfer %u, sgl %u, dma count %d.\n",
1392 __func__, sw_tag, xferlen, sgcnt, err);
1393 }
1394
1395 ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_MAPPED;
1396 ttinfo->cid = csk->port_id;
1397
1398 cxgbi_ppm_make_ppod_hdr(ppm, ttinfo->tag, csk->tid, sgl->offset,
1399 xferlen, &ttinfo->hdr);
1400
1401 if (cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ) {
1402 /* write ppod from xmit_pdu (of iscsi_scsi_command pdu) */
1403 ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_VALID;
1404 } else {
1405 /* write ppod from control queue now */
1406 err = cdev->csk_ddp_set_map(ppm, csk, ttinfo);
1407 if (err < 0)
1408 goto rel_ppods;
1409 }
1410
1411 return 0;
1412
1413 rel_ppods:
1414 cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1415
1416 if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_MAPPED) {
1417 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_MAPPED;
1418 dma_unmap_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1419 }
1420 return -EINVAL;
1421 }
1422
1423 static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1424 {
1425 struct scsi_cmnd *sc = task->sc;
1426 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1427 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1428 struct cxgbi_device *cdev = cconn->chba->cdev;
1429 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1430 u32 tag = ntohl((__force u32)hdr_itt);
1431
1432 log_debug(1 << CXGBI_DBG_DDP,
1433 "cdev 0x%p, task 0x%p, release tag 0x%x.\n",
1434 cdev, task, tag);
1435 if (sc && sc->sc_data_direction == DMA_FROM_DEVICE &&
1436 cxgbi_ppm_is_ddp_tag(ppm, tag)) {
1437 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1438 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1439
1440 if (!(cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ))
1441 cdev->csk_ddp_clear_map(cdev, ppm, ttinfo);
1442 cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1443 dma_unmap_sg(&ppm->pdev->dev, ttinfo->sgl, ttinfo->nents,
1444 DMA_FROM_DEVICE);
1445 }
1446 }
1447
1448 static inline u32 cxgbi_build_sw_tag(u32 idx, u32 age)
1449 {
1450 /* assume idx and age both are < 0x7FFF (32767) */
1451 return (idx << 16) | age;
1452 }
1453
1454 static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1455 {
1456 struct scsi_cmnd *sc = task->sc;
1457 struct iscsi_conn *conn = task->conn;
1458 struct iscsi_session *sess = conn->session;
1459 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1460 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1461 struct cxgbi_device *cdev = cconn->chba->cdev;
1462 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1463 u32 sw_tag = cxgbi_build_sw_tag(task->itt, sess->age);
1464 u32 tag = 0;
1465 int err = -EINVAL;
1466
1467 if (sc && sc->sc_data_direction == DMA_FROM_DEVICE) {
1468 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1469 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1470
1471 scmd_get_params(sc, &ttinfo->sgl, &ttinfo->nents,
1472 &tdata->dlen, 0);
1473 err = cxgbi_ddp_reserve(cconn, tdata, sw_tag, tdata->dlen);
1474 if (!err)
1475 tag = ttinfo->tag;
1476 else
1477 log_debug(1 << CXGBI_DBG_DDP,
1478 "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1479 cconn->cep->csk, task, tdata->dlen,
1480 ttinfo->nents);
1481 }
1482
1483 if (err < 0) {
1484 err = cxgbi_ppm_make_non_ddp_tag(ppm, sw_tag, &tag);
1485 if (err < 0)
1486 return err;
1487 }
1488 /* the itt need to sent in big-endian order */
1489 *hdr_itt = (__force itt_t)htonl(tag);
1490
1491 log_debug(1 << CXGBI_DBG_DDP,
1492 "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1493 cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1494 return 0;
1495 }
1496
1497 void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1498 {
1499 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1500 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1501 struct cxgbi_device *cdev = cconn->chba->cdev;
1502 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1503 u32 tag = ntohl((__force u32)itt);
1504 u32 sw_bits;
1505
1506 if (ppm) {
1507 if (cxgbi_ppm_is_ddp_tag(ppm, tag))
1508 sw_bits = cxgbi_ppm_get_tag_caller_data(ppm, tag);
1509 else
1510 sw_bits = cxgbi_ppm_decode_non_ddp_tag(ppm, tag);
1511 } else {
1512 sw_bits = tag;
1513 }
1514
1515 cxgbi_decode_sw_tag(sw_bits, idx, age);
1516 log_debug(1 << CXGBI_DBG_DDP,
1517 "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1518 cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1519 age ? *age : 0xFF);
1520 }
1521 EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1522
1523 void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1524 {
1525 struct iscsi_conn *conn = csk->user_data;
1526
1527 if (conn) {
1528 log_debug(1 << CXGBI_DBG_SOCK,
1529 "csk 0x%p, cid %d.\n", csk, conn->id);
1530 iscsi_conn_queue_work(conn);
1531 }
1532 }
1533 EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1534
1535 /*
1536 * pdu receive, interact with libiscsi_tcp
1537 */
1538 static inline int read_pdu_skb(struct iscsi_conn *conn,
1539 struct sk_buff *skb,
1540 unsigned int offset,
1541 int offloaded)
1542 {
1543 int status = 0;
1544 int bytes_read;
1545
1546 bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1547 switch (status) {
1548 case ISCSI_TCP_CONN_ERR:
1549 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1550 skb, offset, offloaded);
1551 return -EIO;
1552 case ISCSI_TCP_SUSPENDED:
1553 log_debug(1 << CXGBI_DBG_PDU_RX,
1554 "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1555 skb, offset, offloaded, bytes_read);
1556 /* no transfer - just have caller flush queue */
1557 return bytes_read;
1558 case ISCSI_TCP_SKB_DONE:
1559 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1560 skb, offset, offloaded);
1561 /*
1562 * pdus should always fit in the skb and we should get
1563 * segment done notifcation.
1564 */
1565 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1566 return -EFAULT;
1567 case ISCSI_TCP_SEGMENT_DONE:
1568 log_debug(1 << CXGBI_DBG_PDU_RX,
1569 "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1570 skb, offset, offloaded, bytes_read);
1571 return bytes_read;
1572 default:
1573 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1574 skb, offset, offloaded, status);
1575 return -EINVAL;
1576 }
1577 }
1578
1579 static int
1580 skb_read_pdu_bhs(struct cxgbi_sock *csk, struct iscsi_conn *conn,
1581 struct sk_buff *skb)
1582 {
1583 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1584 int err;
1585
1586 log_debug(1 << CXGBI_DBG_PDU_RX,
1587 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1588 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1589
1590 if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1591 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1592 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1593 return -EIO;
1594 }
1595
1596 if (conn->hdrdgst_en &&
1597 cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1598 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1599 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1600 return -EIO;
1601 }
1602
1603 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_ISCSI_COMPL) &&
1604 cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA_DDPD)) {
1605 /* If completion flag is set and data is directly
1606 * placed in to the host memory then update
1607 * task->exp_datasn to the datasn in completion
1608 * iSCSI hdr as T6 adapter generates completion only
1609 * for the last pdu of a sequence.
1610 */
1611 itt_t itt = ((struct iscsi_data *)skb->data)->itt;
1612 struct iscsi_task *task = iscsi_itt_to_ctask(conn, itt);
1613 u32 data_sn = be32_to_cpu(((struct iscsi_data *)
1614 skb->data)->datasn);
1615 if (task && task->sc) {
1616 struct iscsi_tcp_task *tcp_task = task->dd_data;
1617
1618 tcp_task->exp_datasn = data_sn;
1619 }
1620 }
1621
1622 err = read_pdu_skb(conn, skb, 0, 0);
1623 if (likely(err >= 0)) {
1624 struct iscsi_hdr *hdr = (struct iscsi_hdr *)skb->data;
1625 u8 opcode = hdr->opcode & ISCSI_OPCODE_MASK;
1626
1627 if (unlikely(opcode == ISCSI_OP_LOGOUT_RSP))
1628 cxgbi_sock_set_flag(csk, CTPF_LOGOUT_RSP_RCVD);
1629 }
1630
1631 return err;
1632 }
1633
1634 static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1635 struct sk_buff *skb, unsigned int offset)
1636 {
1637 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1638 bool offloaded = 0;
1639 int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1640
1641 log_debug(1 << CXGBI_DBG_PDU_RX,
1642 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1643 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1644
1645 if (conn->datadgst_en &&
1646 cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1647 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1648 conn, lskb, cxgbi_skcb_flags(lskb));
1649 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1650 return -EIO;
1651 }
1652
1653 if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1654 return 0;
1655
1656 /* coalesced, add header digest length */
1657 if (lskb == skb && conn->hdrdgst_en)
1658 offset += ISCSI_DIGEST_SIZE;
1659
1660 if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1661 offloaded = 1;
1662
1663 if (opcode == ISCSI_OP_SCSI_DATA_IN)
1664 log_debug(1 << CXGBI_DBG_PDU_RX,
1665 "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1666 skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1667 tcp_conn->in.datalen, offloaded ? "is" : "not");
1668
1669 return read_pdu_skb(conn, skb, offset, offloaded);
1670 }
1671
1672 static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1673 {
1674 struct cxgbi_device *cdev = csk->cdev;
1675 int must_send;
1676 u32 credits;
1677
1678 log_debug(1 << CXGBI_DBG_PDU_RX,
1679 "csk 0x%p,%u,0x%lx,%u, seq %u, wup %u, thre %u, %u.\n",
1680 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1681 csk->rcv_wup, cdev->rx_credit_thres,
1682 csk->rcv_win);
1683
1684 if (!cdev->rx_credit_thres)
1685 return;
1686
1687 if (csk->state != CTP_ESTABLISHED)
1688 return;
1689
1690 credits = csk->copied_seq - csk->rcv_wup;
1691 if (unlikely(!credits))
1692 return;
1693 must_send = credits + 16384 >= csk->rcv_win;
1694 if (must_send || credits >= cdev->rx_credit_thres)
1695 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1696 }
1697
1698 void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1699 {
1700 struct cxgbi_device *cdev = csk->cdev;
1701 struct iscsi_conn *conn = csk->user_data;
1702 struct sk_buff *skb;
1703 unsigned int read = 0;
1704 int err = 0;
1705
1706 log_debug(1 << CXGBI_DBG_PDU_RX,
1707 "csk 0x%p, conn 0x%p.\n", csk, conn);
1708
1709 if (unlikely(!conn || conn->suspend_rx)) {
1710 log_debug(1 << CXGBI_DBG_PDU_RX,
1711 "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1712 csk, conn, conn ? conn->id : 0xFF,
1713 conn ? conn->suspend_rx : 0xFF);
1714 return;
1715 }
1716
1717 while (!err) {
1718 skb = skb_peek(&csk->receive_queue);
1719 if (!skb ||
1720 !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1721 if (skb)
1722 log_debug(1 << CXGBI_DBG_PDU_RX,
1723 "skb 0x%p, NOT ready 0x%lx.\n",
1724 skb, cxgbi_skcb_flags(skb));
1725 break;
1726 }
1727 __skb_unlink(skb, &csk->receive_queue);
1728
1729 read += cxgbi_skcb_rx_pdulen(skb);
1730 log_debug(1 << CXGBI_DBG_PDU_RX,
1731 "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1732 csk, skb, skb->len, cxgbi_skcb_flags(skb),
1733 cxgbi_skcb_rx_pdulen(skb));
1734
1735 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1736 err = skb_read_pdu_bhs(csk, conn, skb);
1737 if (err < 0) {
1738 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1739 "f 0x%lx, plen %u.\n",
1740 csk, skb, skb->len,
1741 cxgbi_skcb_flags(skb),
1742 cxgbi_skcb_rx_pdulen(skb));
1743 goto skb_done;
1744 }
1745 err = skb_read_pdu_data(conn, skb, skb,
1746 err + cdev->skb_rx_extra);
1747 if (err < 0)
1748 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1749 "f 0x%lx, plen %u.\n",
1750 csk, skb, skb->len,
1751 cxgbi_skcb_flags(skb),
1752 cxgbi_skcb_rx_pdulen(skb));
1753 } else {
1754 err = skb_read_pdu_bhs(csk, conn, skb);
1755 if (err < 0) {
1756 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1757 "f 0x%lx, plen %u.\n",
1758 csk, skb, skb->len,
1759 cxgbi_skcb_flags(skb),
1760 cxgbi_skcb_rx_pdulen(skb));
1761 goto skb_done;
1762 }
1763
1764 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1765 struct sk_buff *dskb;
1766
1767 dskb = skb_peek(&csk->receive_queue);
1768 if (!dskb) {
1769 pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1770 " plen %u, NO data.\n",
1771 csk, skb, skb->len,
1772 cxgbi_skcb_flags(skb),
1773 cxgbi_skcb_rx_pdulen(skb));
1774 err = -EIO;
1775 goto skb_done;
1776 }
1777 __skb_unlink(dskb, &csk->receive_queue);
1778
1779 err = skb_read_pdu_data(conn, skb, dskb, 0);
1780 if (err < 0)
1781 pr_err("data, csk 0x%p, skb 0x%p,%u, "
1782 "f 0x%lx, plen %u, dskb 0x%p,"
1783 "%u.\n",
1784 csk, skb, skb->len,
1785 cxgbi_skcb_flags(skb),
1786 cxgbi_skcb_rx_pdulen(skb),
1787 dskb, dskb->len);
1788 __kfree_skb(dskb);
1789 } else
1790 err = skb_read_pdu_data(conn, skb, skb, 0);
1791 }
1792 skb_done:
1793 __kfree_skb(skb);
1794
1795 if (err < 0)
1796 break;
1797 }
1798
1799 log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
1800 if (read) {
1801 csk->copied_seq += read;
1802 csk_return_rx_credits(csk, read);
1803 conn->rxdata_octets += read;
1804 }
1805
1806 if (err < 0) {
1807 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
1808 csk, conn, err, read);
1809 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1810 }
1811 }
1812 EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
1813
1814 static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
1815 unsigned int offset, unsigned int *off,
1816 struct scatterlist **sgp)
1817 {
1818 int i;
1819 struct scatterlist *sg;
1820
1821 for_each_sg(sgl, sg, sgcnt, i) {
1822 if (offset < sg->length) {
1823 *off = offset;
1824 *sgp = sg;
1825 return 0;
1826 }
1827 offset -= sg->length;
1828 }
1829 return -EFAULT;
1830 }
1831
1832 static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
1833 unsigned int dlen, struct page_frag *frags,
1834 int frag_max)
1835 {
1836 unsigned int datalen = dlen;
1837 unsigned int sglen = sg->length - sgoffset;
1838 struct page *page = sg_page(sg);
1839 int i;
1840
1841 i = 0;
1842 do {
1843 unsigned int copy;
1844
1845 if (!sglen) {
1846 sg = sg_next(sg);
1847 if (!sg) {
1848 pr_warn("sg %d NULL, len %u/%u.\n",
1849 i, datalen, dlen);
1850 return -EINVAL;
1851 }
1852 sgoffset = 0;
1853 sglen = sg->length;
1854 page = sg_page(sg);
1855
1856 }
1857 copy = min(datalen, sglen);
1858 if (i && page == frags[i - 1].page &&
1859 sgoffset + sg->offset ==
1860 frags[i - 1].offset + frags[i - 1].size) {
1861 frags[i - 1].size += copy;
1862 } else {
1863 if (i >= frag_max) {
1864 pr_warn("too many pages %u, dlen %u.\n",
1865 frag_max, dlen);
1866 return -EINVAL;
1867 }
1868
1869 frags[i].page = page;
1870 frags[i].offset = sg->offset + sgoffset;
1871 frags[i].size = copy;
1872 i++;
1873 }
1874 datalen -= copy;
1875 sgoffset += copy;
1876 sglen -= copy;
1877 } while (datalen);
1878
1879 return i;
1880 }
1881
1882 int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
1883 {
1884 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1885 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1886 struct cxgbi_device *cdev = cconn->chba->cdev;
1887 struct iscsi_conn *conn = task->conn;
1888 struct iscsi_tcp_task *tcp_task = task->dd_data;
1889 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1890 struct scsi_cmnd *sc = task->sc;
1891 struct cxgbi_sock *csk = cconn->cep->csk;
1892 struct net_device *ndev = cdev->ports[csk->port_id];
1893 int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
1894
1895 tcp_task->dd_data = tdata;
1896 task->hdr = NULL;
1897
1898 if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
1899 (opcode == ISCSI_OP_SCSI_DATA_OUT ||
1900 (opcode == ISCSI_OP_SCSI_CMD &&
1901 sc->sc_data_direction == DMA_TO_DEVICE)))
1902 /* data could goes into skb head */
1903 headroom += min_t(unsigned int,
1904 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
1905 conn->max_xmit_dlength);
1906
1907 tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
1908 if (!tdata->skb) {
1909 ndev->stats.tx_dropped++;
1910 return -ENOMEM;
1911 }
1912
1913 skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
1914
1915 if (task->sc) {
1916 task->hdr = (struct iscsi_hdr *)tdata->skb->data;
1917 } else {
1918 task->hdr = kzalloc(SKB_TX_ISCSI_PDU_HEADER_MAX, GFP_ATOMIC);
1919 if (!task->hdr) {
1920 __kfree_skb(tdata->skb);
1921 tdata->skb = NULL;
1922 ndev->stats.tx_dropped++;
1923 return -ENOMEM;
1924 }
1925 }
1926 task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
1927
1928 /* data_out uses scsi_cmd's itt */
1929 if (opcode != ISCSI_OP_SCSI_DATA_OUT)
1930 task_reserve_itt(task, &task->hdr->itt);
1931
1932 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1933 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
1934 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
1935 conn->max_xmit_dlength, ntohl(task->hdr->itt));
1936
1937 return 0;
1938 }
1939 EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
1940
1941 static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
1942 {
1943 if (hcrc || dcrc) {
1944 u8 submode = 0;
1945
1946 if (hcrc)
1947 submode |= 1;
1948 if (dcrc)
1949 submode |= 2;
1950 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
1951 } else
1952 cxgbi_skcb_ulp_mode(skb) = 0;
1953 }
1954
1955 int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
1956 unsigned int count)
1957 {
1958 struct iscsi_conn *conn = task->conn;
1959 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1960 struct sk_buff *skb = tdata->skb;
1961 unsigned int datalen = count;
1962 int i, padlen = iscsi_padding(count);
1963 struct page *pg;
1964
1965 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1966 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
1967 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
1968 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
1969
1970 skb_put(skb, task->hdr_len);
1971 tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
1972 if (!count)
1973 return 0;
1974
1975 if (task->sc) {
1976 struct scsi_data_buffer *sdb = &task->sc->sdb;
1977 struct scatterlist *sg = NULL;
1978 int err;
1979
1980 tdata->offset = offset;
1981 tdata->count = count;
1982 err = sgl_seek_offset(
1983 sdb->table.sgl, sdb->table.nents,
1984 tdata->offset, &tdata->sgoffset, &sg);
1985 if (err < 0) {
1986 pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
1987 sdb->table.nents, tdata->offset, sdb->length);
1988 return err;
1989 }
1990 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
1991 tdata->frags, MAX_PDU_FRAGS);
1992 if (err < 0) {
1993 pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
1994 sdb->table.nents, tdata->offset, tdata->count);
1995 return err;
1996 }
1997 tdata->nr_frags = err;
1998
1999 if (tdata->nr_frags > MAX_SKB_FRAGS ||
2000 (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
2001 char *dst = skb->data + task->hdr_len;
2002 struct page_frag *frag = tdata->frags;
2003
2004 /* data fits in the skb's headroom */
2005 for (i = 0; i < tdata->nr_frags; i++, frag++) {
2006 char *src = kmap_atomic(frag->page);
2007
2008 memcpy(dst, src+frag->offset, frag->size);
2009 dst += frag->size;
2010 kunmap_atomic(src);
2011 }
2012 if (padlen) {
2013 memset(dst, 0, padlen);
2014 padlen = 0;
2015 }
2016 skb_put(skb, count + padlen);
2017 } else {
2018 /* data fit into frag_list */
2019 for (i = 0; i < tdata->nr_frags; i++) {
2020 __skb_fill_page_desc(skb, i,
2021 tdata->frags[i].page,
2022 tdata->frags[i].offset,
2023 tdata->frags[i].size);
2024 skb_frag_ref(skb, i);
2025 }
2026 skb_shinfo(skb)->nr_frags = tdata->nr_frags;
2027 skb->len += count;
2028 skb->data_len += count;
2029 skb->truesize += count;
2030 }
2031
2032 } else {
2033 pg = virt_to_page(task->data);
2034
2035 get_page(pg);
2036 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
2037 count);
2038 skb->len += count;
2039 skb->data_len += count;
2040 skb->truesize += count;
2041 }
2042
2043 if (padlen) {
2044 i = skb_shinfo(skb)->nr_frags;
2045 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
2046 virt_to_page(padding), offset_in_page(padding),
2047 padlen);
2048
2049 skb->data_len += padlen;
2050 skb->truesize += padlen;
2051 skb->len += padlen;
2052 }
2053
2054 return 0;
2055 }
2056 EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
2057
2058 int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2059 {
2060 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2061 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2062 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2063 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
2064 struct sk_buff *skb = tdata->skb;
2065 struct cxgbi_sock *csk = NULL;
2066 unsigned int datalen;
2067 int err;
2068
2069 if (!skb) {
2070 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2071 "task 0x%p\n", task);
2072 return 0;
2073 }
2074
2075 if (cconn && cconn->cep)
2076 csk = cconn->cep->csk;
2077 if (!csk) {
2078 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2079 "task 0x%p, csk gone.\n", task);
2080 return -EPIPE;
2081 }
2082
2083 tdata->skb = NULL;
2084 datalen = skb->data_len;
2085
2086 /* write ppod first if using ofldq to write ppod */
2087 if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_VALID) {
2088 struct cxgbi_ppm *ppm = csk->cdev->cdev2ppm(csk->cdev);
2089
2090 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_VALID;
2091 if (csk->cdev->csk_ddp_set_map(ppm, csk, ttinfo) < 0)
2092 pr_err("task 0x%p, ppod writing using ofldq failed.\n",
2093 task);
2094 /* continue. Let fl get the data */
2095 }
2096
2097 if (!task->sc)
2098 memcpy(skb->data, task->hdr, SKB_TX_ISCSI_PDU_HEADER_MAX);
2099
2100 err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2101 if (err > 0) {
2102 int pdulen = err;
2103
2104 log_debug(1 << CXGBI_DBG_PDU_TX,
2105 "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2106 task, task->sc, skb, skb->len, skb->data_len, err);
2107
2108 if (task->conn->hdrdgst_en)
2109 pdulen += ISCSI_DIGEST_SIZE;
2110
2111 if (datalen && task->conn->datadgst_en)
2112 pdulen += ISCSI_DIGEST_SIZE;
2113
2114 task->conn->txdata_octets += pdulen;
2115 return 0;
2116 }
2117
2118 if (err == -EAGAIN || err == -ENOBUFS) {
2119 log_debug(1 << CXGBI_DBG_PDU_TX,
2120 "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2121 task, skb, skb->len, skb->data_len, err);
2122 /* reset skb to send when we are called again */
2123 tdata->skb = skb;
2124 return err;
2125 }
2126
2127 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2128 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2129 task->itt, skb, skb->len, skb->data_len, err);
2130
2131 __kfree_skb(skb);
2132
2133 iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2134 iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2135 return err;
2136 }
2137 EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2138
2139 void cxgbi_cleanup_task(struct iscsi_task *task)
2140 {
2141 struct iscsi_tcp_task *tcp_task = task->dd_data;
2142 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2143
2144 if (!tcp_task || !tdata || (tcp_task->dd_data != tdata)) {
2145 pr_info("task 0x%p,0x%p, tcp_task 0x%p, tdata 0x%p/0x%p.\n",
2146 task, task->sc, tcp_task,
2147 tcp_task ? tcp_task->dd_data : NULL, tdata);
2148 return;
2149 }
2150
2151 log_debug(1 << CXGBI_DBG_ISCSI,
2152 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2153 task, tdata->skb, task->hdr_itt);
2154
2155 tcp_task->dd_data = NULL;
2156
2157 if (!task->sc)
2158 kfree(task->hdr);
2159 task->hdr = NULL;
2160
2161 /* never reached the xmit task callout */
2162 if (tdata->skb) {
2163 __kfree_skb(tdata->skb);
2164 tdata->skb = NULL;
2165 }
2166
2167 task_release_itt(task, task->hdr_itt);
2168 memset(tdata, 0, sizeof(*tdata));
2169
2170 iscsi_tcp_cleanup_task(task);
2171 }
2172 EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2173
2174 void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2175 struct iscsi_stats *stats)
2176 {
2177 struct iscsi_conn *conn = cls_conn->dd_data;
2178
2179 stats->txdata_octets = conn->txdata_octets;
2180 stats->rxdata_octets = conn->rxdata_octets;
2181 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2182 stats->dataout_pdus = conn->dataout_pdus_cnt;
2183 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2184 stats->datain_pdus = conn->datain_pdus_cnt;
2185 stats->r2t_pdus = conn->r2t_pdus_cnt;
2186 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2187 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2188 stats->digest_err = 0;
2189 stats->timeout_err = 0;
2190 stats->custom_length = 1;
2191 strcpy(stats->custom[0].desc, "eh_abort_cnt");
2192 stats->custom[0].value = conn->eh_abort_cnt;
2193 }
2194 EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2195
2196 static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2197 {
2198 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2199 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2200 struct cxgbi_device *cdev = cconn->chba->cdev;
2201 unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2202 unsigned int max_def = 512 * MAX_SKB_FRAGS;
2203 unsigned int max = max(max_def, headroom);
2204
2205 max = min(cconn->chba->cdev->tx_max_size, max);
2206 if (conn->max_xmit_dlength)
2207 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2208 else
2209 conn->max_xmit_dlength = max;
2210 cxgbi_align_pdu_size(conn->max_xmit_dlength);
2211
2212 return 0;
2213 }
2214
2215 static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2216 {
2217 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2218 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2219 unsigned int max = cconn->chba->cdev->rx_max_size;
2220
2221 cxgbi_align_pdu_size(max);
2222
2223 if (conn->max_recv_dlength) {
2224 if (conn->max_recv_dlength > max) {
2225 pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2226 conn->max_recv_dlength, max);
2227 return -EINVAL;
2228 }
2229 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2230 cxgbi_align_pdu_size(conn->max_recv_dlength);
2231 } else
2232 conn->max_recv_dlength = max;
2233
2234 return 0;
2235 }
2236
2237 int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2238 enum iscsi_param param, char *buf, int buflen)
2239 {
2240 struct iscsi_conn *conn = cls_conn->dd_data;
2241 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2242 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2243 struct cxgbi_sock *csk = cconn->cep->csk;
2244 int err;
2245
2246 log_debug(1 << CXGBI_DBG_ISCSI,
2247 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2248 cls_conn, param, buflen, buf);
2249
2250 switch (param) {
2251 case ISCSI_PARAM_HDRDGST_EN:
2252 err = iscsi_set_param(cls_conn, param, buf, buflen);
2253 if (!err && conn->hdrdgst_en)
2254 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2255 conn->hdrdgst_en,
2256 conn->datadgst_en);
2257 break;
2258 case ISCSI_PARAM_DATADGST_EN:
2259 err = iscsi_set_param(cls_conn, param, buf, buflen);
2260 if (!err && conn->datadgst_en)
2261 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2262 conn->hdrdgst_en,
2263 conn->datadgst_en);
2264 break;
2265 case ISCSI_PARAM_MAX_R2T:
2266 return iscsi_tcp_set_max_r2t(conn, buf);
2267 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2268 err = iscsi_set_param(cls_conn, param, buf, buflen);
2269 if (!err)
2270 err = cxgbi_conn_max_recv_dlength(conn);
2271 break;
2272 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2273 err = iscsi_set_param(cls_conn, param, buf, buflen);
2274 if (!err)
2275 err = cxgbi_conn_max_xmit_dlength(conn);
2276 break;
2277 default:
2278 return iscsi_set_param(cls_conn, param, buf, buflen);
2279 }
2280 return err;
2281 }
2282 EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2283
2284 static inline int csk_print_port(struct cxgbi_sock *csk, char *buf)
2285 {
2286 int len;
2287
2288 cxgbi_sock_get(csk);
2289 len = sprintf(buf, "%hu\n", ntohs(csk->daddr.sin_port));
2290 cxgbi_sock_put(csk);
2291
2292 return len;
2293 }
2294
2295 static inline int csk_print_ip(struct cxgbi_sock *csk, char *buf)
2296 {
2297 int len;
2298
2299 cxgbi_sock_get(csk);
2300 if (csk->csk_family == AF_INET)
2301 len = sprintf(buf, "%pI4",
2302 &csk->daddr.sin_addr.s_addr);
2303 else
2304 len = sprintf(buf, "%pI6",
2305 &csk->daddr6.sin6_addr);
2306
2307 cxgbi_sock_put(csk);
2308
2309 return len;
2310 }
2311
2312 int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2313 char *buf)
2314 {
2315 struct cxgbi_endpoint *cep = ep->dd_data;
2316 struct cxgbi_sock *csk;
2317 int len;
2318
2319 log_debug(1 << CXGBI_DBG_ISCSI,
2320 "cls_conn 0x%p, param %d.\n", ep, param);
2321
2322 switch (param) {
2323 case ISCSI_PARAM_CONN_PORT:
2324 case ISCSI_PARAM_CONN_ADDRESS:
2325 if (!cep)
2326 return -ENOTCONN;
2327
2328 csk = cep->csk;
2329 if (!csk)
2330 return -ENOTCONN;
2331
2332 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2333 &csk->daddr, param, buf);
2334 default:
2335 return -ENOSYS;
2336 }
2337 return len;
2338 }
2339 EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
2340
2341 struct iscsi_cls_conn *
2342 cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2343 {
2344 struct iscsi_cls_conn *cls_conn;
2345 struct iscsi_conn *conn;
2346 struct iscsi_tcp_conn *tcp_conn;
2347 struct cxgbi_conn *cconn;
2348
2349 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2350 if (!cls_conn)
2351 return NULL;
2352
2353 conn = cls_conn->dd_data;
2354 tcp_conn = conn->dd_data;
2355 cconn = tcp_conn->dd_data;
2356 cconn->iconn = conn;
2357
2358 log_debug(1 << CXGBI_DBG_ISCSI,
2359 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2360 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2361
2362 return cls_conn;
2363 }
2364 EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2365
2366 int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2367 struct iscsi_cls_conn *cls_conn,
2368 u64 transport_eph, int is_leading)
2369 {
2370 struct iscsi_conn *conn = cls_conn->dd_data;
2371 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2372 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2373 struct cxgbi_ppm *ppm;
2374 struct iscsi_endpoint *ep;
2375 struct cxgbi_endpoint *cep;
2376 struct cxgbi_sock *csk;
2377 int err;
2378
2379 ep = iscsi_lookup_endpoint(transport_eph);
2380 if (!ep)
2381 return -EINVAL;
2382
2383 /* setup ddp pagesize */
2384 cep = ep->dd_data;
2385 csk = cep->csk;
2386
2387 ppm = csk->cdev->cdev2ppm(csk->cdev);
2388 err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid,
2389 ppm->tformat.pgsz_idx_dflt);
2390 if (err < 0)
2391 return err;
2392
2393 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2394 if (err)
2395 return -EINVAL;
2396
2397 /* calculate the tag idx bits needed for this conn based on cmds_max */
2398 cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2399
2400 write_lock_bh(&csk->callback_lock);
2401 csk->user_data = conn;
2402 cconn->chba = cep->chba;
2403 cconn->cep = cep;
2404 cep->cconn = cconn;
2405 write_unlock_bh(&csk->callback_lock);
2406
2407 cxgbi_conn_max_xmit_dlength(conn);
2408 cxgbi_conn_max_recv_dlength(conn);
2409
2410 log_debug(1 << CXGBI_DBG_ISCSI,
2411 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2412 cls_session, cls_conn, ep, cconn, csk);
2413 /* init recv engine */
2414 iscsi_tcp_hdr_recv_prep(tcp_conn);
2415
2416 return 0;
2417 }
2418 EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2419
2420 struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2421 u16 cmds_max, u16 qdepth,
2422 u32 initial_cmdsn)
2423 {
2424 struct cxgbi_endpoint *cep;
2425 struct cxgbi_hba *chba;
2426 struct Scsi_Host *shost;
2427 struct iscsi_cls_session *cls_session;
2428 struct iscsi_session *session;
2429
2430 if (!ep) {
2431 pr_err("missing endpoint.\n");
2432 return NULL;
2433 }
2434
2435 cep = ep->dd_data;
2436 chba = cep->chba;
2437 shost = chba->shost;
2438
2439 BUG_ON(chba != iscsi_host_priv(shost));
2440
2441 cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2442 cmds_max, 0,
2443 sizeof(struct iscsi_tcp_task) +
2444 sizeof(struct cxgbi_task_data),
2445 initial_cmdsn, ISCSI_MAX_TARGET);
2446 if (!cls_session)
2447 return NULL;
2448
2449 session = cls_session->dd_data;
2450 if (iscsi_tcp_r2tpool_alloc(session))
2451 goto remove_session;
2452
2453 log_debug(1 << CXGBI_DBG_ISCSI,
2454 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2455 return cls_session;
2456
2457 remove_session:
2458 iscsi_session_teardown(cls_session);
2459 return NULL;
2460 }
2461 EXPORT_SYMBOL_GPL(cxgbi_create_session);
2462
2463 void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2464 {
2465 log_debug(1 << CXGBI_DBG_ISCSI,
2466 "cls sess 0x%p.\n", cls_session);
2467
2468 iscsi_tcp_r2tpool_free(cls_session->dd_data);
2469 iscsi_session_teardown(cls_session);
2470 }
2471 EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2472
2473 int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2474 char *buf, int buflen)
2475 {
2476 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2477
2478 if (!chba->ndev) {
2479 shost_printk(KERN_ERR, shost, "Could not get host param. "
2480 "netdev for host not set.\n");
2481 return -ENODEV;
2482 }
2483
2484 log_debug(1 << CXGBI_DBG_ISCSI,
2485 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2486 shost, chba, chba->ndev->name, param, buflen, buf);
2487
2488 switch (param) {
2489 case ISCSI_HOST_PARAM_IPADDRESS:
2490 {
2491 __be32 addr = in_aton(buf);
2492 log_debug(1 << CXGBI_DBG_ISCSI,
2493 "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2494 cxgbi_set_iscsi_ipv4(chba, addr);
2495 return 0;
2496 }
2497 case ISCSI_HOST_PARAM_HWADDRESS:
2498 case ISCSI_HOST_PARAM_NETDEV_NAME:
2499 return 0;
2500 default:
2501 return iscsi_host_set_param(shost, param, buf, buflen);
2502 }
2503 }
2504 EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2505
2506 int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2507 char *buf)
2508 {
2509 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2510 int len = 0;
2511
2512 if (!chba->ndev) {
2513 shost_printk(KERN_ERR, shost, "Could not get host param. "
2514 "netdev for host not set.\n");
2515 return -ENODEV;
2516 }
2517
2518 log_debug(1 << CXGBI_DBG_ISCSI,
2519 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2520 shost, chba, chba->ndev->name, param);
2521
2522 switch (param) {
2523 case ISCSI_HOST_PARAM_HWADDRESS:
2524 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2525 break;
2526 case ISCSI_HOST_PARAM_NETDEV_NAME:
2527 len = sprintf(buf, "%s\n", chba->ndev->name);
2528 break;
2529 case ISCSI_HOST_PARAM_IPADDRESS:
2530 {
2531 struct cxgbi_sock *csk = find_sock_on_port(chba->cdev,
2532 chba->port_id);
2533 if (csk) {
2534 len = sprintf(buf, "%pIS",
2535 (struct sockaddr *)&csk->saddr);
2536 }
2537 log_debug(1 << CXGBI_DBG_ISCSI,
2538 "hba %s, addr %s.\n", chba->ndev->name, buf);
2539 break;
2540 }
2541 default:
2542 return iscsi_host_get_param(shost, param, buf);
2543 }
2544
2545 return len;
2546 }
2547 EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2548
2549 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2550 struct sockaddr *dst_addr,
2551 int non_blocking)
2552 {
2553 struct iscsi_endpoint *ep;
2554 struct cxgbi_endpoint *cep;
2555 struct cxgbi_hba *hba = NULL;
2556 struct cxgbi_sock *csk;
2557 int ifindex = 0;
2558 int err = -EINVAL;
2559
2560 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2561 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2562 shost, non_blocking, dst_addr);
2563
2564 if (shost) {
2565 hba = iscsi_host_priv(shost);
2566 if (!hba) {
2567 pr_info("shost 0x%p, priv NULL.\n", shost);
2568 goto err_out;
2569 }
2570
2571 rtnl_lock();
2572 if (!vlan_uses_dev(hba->ndev))
2573 ifindex = hba->ndev->ifindex;
2574 rtnl_unlock();
2575 }
2576
2577 if (dst_addr->sa_family == AF_INET) {
2578 csk = cxgbi_check_route(dst_addr, ifindex);
2579 #if IS_ENABLED(CONFIG_IPV6)
2580 } else if (dst_addr->sa_family == AF_INET6) {
2581 csk = cxgbi_check_route6(dst_addr, ifindex);
2582 #endif
2583 } else {
2584 pr_info("address family 0x%x NOT supported.\n",
2585 dst_addr->sa_family);
2586 err = -EAFNOSUPPORT;
2587 return (struct iscsi_endpoint *)ERR_PTR(err);
2588 }
2589
2590 if (IS_ERR(csk))
2591 return (struct iscsi_endpoint *)csk;
2592 cxgbi_sock_get(csk);
2593
2594 if (!hba)
2595 hba = csk->cdev->hbas[csk->port_id];
2596 else if (hba != csk->cdev->hbas[csk->port_id]) {
2597 pr_info("Could not connect through requested host %u"
2598 "hba 0x%p != 0x%p (%u).\n",
2599 shost->host_no, hba,
2600 csk->cdev->hbas[csk->port_id], csk->port_id);
2601 err = -ENOSPC;
2602 goto release_conn;
2603 }
2604
2605 err = sock_get_port(csk);
2606 if (err)
2607 goto release_conn;
2608
2609 cxgbi_sock_set_state(csk, CTP_CONNECTING);
2610 err = csk->cdev->csk_init_act_open(csk);
2611 if (err)
2612 goto release_conn;
2613
2614 if (cxgbi_sock_is_closing(csk)) {
2615 err = -ENOSPC;
2616 pr_info("csk 0x%p is closing.\n", csk);
2617 goto release_conn;
2618 }
2619
2620 ep = iscsi_create_endpoint(sizeof(*cep));
2621 if (!ep) {
2622 err = -ENOMEM;
2623 pr_info("iscsi alloc ep, OOM.\n");
2624 goto release_conn;
2625 }
2626
2627 cep = ep->dd_data;
2628 cep->csk = csk;
2629 cep->chba = hba;
2630
2631 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2632 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2633 ep, cep, csk, hba, hba->ndev->name);
2634 return ep;
2635
2636 release_conn:
2637 cxgbi_sock_put(csk);
2638 cxgbi_sock_closed(csk);
2639 err_out:
2640 return ERR_PTR(err);
2641 }
2642 EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2643
2644 int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2645 {
2646 struct cxgbi_endpoint *cep = ep->dd_data;
2647 struct cxgbi_sock *csk = cep->csk;
2648
2649 if (!cxgbi_sock_is_established(csk))
2650 return 0;
2651 return 1;
2652 }
2653 EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2654
2655 void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2656 {
2657 struct cxgbi_endpoint *cep = ep->dd_data;
2658 struct cxgbi_conn *cconn = cep->cconn;
2659 struct cxgbi_sock *csk = cep->csk;
2660
2661 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2662 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2663 ep, cep, cconn, csk, csk->state, csk->flags);
2664
2665 if (cconn && cconn->iconn) {
2666 iscsi_suspend_tx(cconn->iconn);
2667 write_lock_bh(&csk->callback_lock);
2668 cep->csk->user_data = NULL;
2669 cconn->cep = NULL;
2670 write_unlock_bh(&csk->callback_lock);
2671 }
2672 iscsi_destroy_endpoint(ep);
2673
2674 if (likely(csk->state >= CTP_ESTABLISHED))
2675 need_active_close(csk);
2676 else
2677 cxgbi_sock_closed(csk);
2678
2679 cxgbi_sock_put(csk);
2680 }
2681 EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2682
2683 int cxgbi_iscsi_init(struct iscsi_transport *itp,
2684 struct scsi_transport_template **stt)
2685 {
2686 *stt = iscsi_register_transport(itp);
2687 if (*stt == NULL) {
2688 pr_err("unable to register %s transport 0x%p.\n",
2689 itp->name, itp);
2690 return -ENODEV;
2691 }
2692 log_debug(1 << CXGBI_DBG_ISCSI,
2693 "%s, registered iscsi transport 0x%p.\n",
2694 itp->name, stt);
2695 return 0;
2696 }
2697 EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2698
2699 void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2700 struct scsi_transport_template **stt)
2701 {
2702 if (*stt) {
2703 log_debug(1 << CXGBI_DBG_ISCSI,
2704 "de-register transport 0x%p, %s, stt 0x%p.\n",
2705 itp, itp->name, *stt);
2706 *stt = NULL;
2707 iscsi_unregister_transport(itp);
2708 }
2709 }
2710 EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2711
2712 umode_t cxgbi_attr_is_visible(int param_type, int param)
2713 {
2714 switch (param_type) {
2715 case ISCSI_HOST_PARAM:
2716 switch (param) {
2717 case ISCSI_HOST_PARAM_NETDEV_NAME:
2718 case ISCSI_HOST_PARAM_HWADDRESS:
2719 case ISCSI_HOST_PARAM_IPADDRESS:
2720 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2721 return S_IRUGO;
2722 default:
2723 return 0;
2724 }
2725 case ISCSI_PARAM:
2726 switch (param) {
2727 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2728 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2729 case ISCSI_PARAM_HDRDGST_EN:
2730 case ISCSI_PARAM_DATADGST_EN:
2731 case ISCSI_PARAM_CONN_ADDRESS:
2732 case ISCSI_PARAM_CONN_PORT:
2733 case ISCSI_PARAM_EXP_STATSN:
2734 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2735 case ISCSI_PARAM_PERSISTENT_PORT:
2736 case ISCSI_PARAM_PING_TMO:
2737 case ISCSI_PARAM_RECV_TMO:
2738 case ISCSI_PARAM_INITIAL_R2T_EN:
2739 case ISCSI_PARAM_MAX_R2T:
2740 case ISCSI_PARAM_IMM_DATA_EN:
2741 case ISCSI_PARAM_FIRST_BURST:
2742 case ISCSI_PARAM_MAX_BURST:
2743 case ISCSI_PARAM_PDU_INORDER_EN:
2744 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2745 case ISCSI_PARAM_ERL:
2746 case ISCSI_PARAM_TARGET_NAME:
2747 case ISCSI_PARAM_TPGT:
2748 case ISCSI_PARAM_USERNAME:
2749 case ISCSI_PARAM_PASSWORD:
2750 case ISCSI_PARAM_USERNAME_IN:
2751 case ISCSI_PARAM_PASSWORD_IN:
2752 case ISCSI_PARAM_FAST_ABORT:
2753 case ISCSI_PARAM_ABORT_TMO:
2754 case ISCSI_PARAM_LU_RESET_TMO:
2755 case ISCSI_PARAM_TGT_RESET_TMO:
2756 case ISCSI_PARAM_IFACE_NAME:
2757 case ISCSI_PARAM_INITIATOR_NAME:
2758 return S_IRUGO;
2759 default:
2760 return 0;
2761 }
2762 }
2763
2764 return 0;
2765 }
2766 EXPORT_SYMBOL_GPL(cxgbi_attr_is_visible);
2767
2768 static int __init libcxgbi_init_module(void)
2769 {
2770 pr_info("%s", version);
2771
2772 BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, cb) <
2773 sizeof(struct cxgbi_skb_cb));
2774 return 0;
2775 }
2776
2777 static void __exit libcxgbi_exit_module(void)
2778 {
2779 cxgbi_device_unregister_all(0xFF);
2780 return;
2781 }
2782
2783 module_init(libcxgbi_init_module);
2784 module_exit(libcxgbi_exit_module);
Linux with added FPC-III support