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mic: vop: Fix use-after-free on remove
[linux/fpc-iii.git] / drivers / scsi / cxgbi / libcxgbi.c
blob245742557c03646677a120c5feb5213931e06e31
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 mtu = ndev->mtu;
645 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
646 n->dev->name, ndev->name, mtu);
647 }
648
649 if (!(ndev->flags & IFF_UP) || !netif_carrier_ok(ndev)) {
650 pr_info("%s interface not up.\n", ndev->name);
651 err = -ENETDOWN;
652 goto rel_neigh;
653 }
654
655 cdev = cxgbi_device_find_by_netdev(ndev, &port);
656 if (!cdev) {
657 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
658 &daddr->sin_addr.s_addr, ndev->name);
659 err = -ENETUNREACH;
660 goto rel_neigh;
661 }
662 log_debug(1 << CXGBI_DBG_SOCK,
663 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
664 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
665 port, ndev->name, cdev);
666
667 csk = cxgbi_sock_create(cdev);
668 if (!csk) {
669 err = -ENOMEM;
670 goto rel_neigh;
671 }
672 csk->cdev = cdev;
673 csk->port_id = port;
674 csk->mtu = mtu;
675 csk->dst = dst;
676
677 csk->csk_family = AF_INET;
678 csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
679 csk->daddr.sin_port = daddr->sin_port;
680 csk->daddr.sin_family = daddr->sin_family;
681 csk->saddr.sin_family = daddr->sin_family;
682 csk->saddr.sin_addr.s_addr = fl4.saddr;
683 neigh_release(n);
684
685 return csk;
686
687 rel_neigh:
688 neigh_release(n);
689
690 rel_rt:
691 ip_rt_put(rt);
692 err_out:
693 return ERR_PTR(err);
694 }
695
696 #if IS_ENABLED(CONFIG_IPV6)
697 static struct rt6_info *find_route_ipv6(const struct in6_addr *saddr,
698 const struct in6_addr *daddr,
699 int ifindex)
700 {
701 struct flowi6 fl;
702
703 memset(&fl, 0, sizeof(fl));
704 fl.flowi6_oif = ifindex;
705 if (saddr)
706 memcpy(&fl.saddr, saddr, sizeof(struct in6_addr));
707 if (daddr)
708 memcpy(&fl.daddr, daddr, sizeof(struct in6_addr));
709 return (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl);
710 }
711
712 static struct cxgbi_sock *
713 cxgbi_check_route6(struct sockaddr *dst_addr, int ifindex)
714 {
715 struct sockaddr_in6 *daddr6 = (struct sockaddr_in6 *)dst_addr;
716 struct dst_entry *dst;
717 struct net_device *ndev;
718 struct cxgbi_device *cdev;
719 struct rt6_info *rt = NULL;
720 struct neighbour *n;
721 struct in6_addr pref_saddr;
722 struct cxgbi_sock *csk = NULL;
723 unsigned int mtu = 0;
724 int port = 0xFFFF;
725 int err = 0;
726
727 rt = find_route_ipv6(NULL, &daddr6->sin6_addr, ifindex);
728
729 if (!rt) {
730 pr_info("no route to ipv6 %pI6 port %u\n",
731 daddr6->sin6_addr.s6_addr,
732 be16_to_cpu(daddr6->sin6_port));
733 err = -ENETUNREACH;
734 goto err_out;
735 }
736
737 dst = &rt->dst;
738
739 n = dst_neigh_lookup(dst, &daddr6->sin6_addr);
740
741 if (!n) {
742 pr_info("%pI6, port %u, dst no neighbour.\n",
743 daddr6->sin6_addr.s6_addr,
744 be16_to_cpu(daddr6->sin6_port));
745 err = -ENETUNREACH;
746 goto rel_rt;
747 }
748 ndev = n->dev;
749
750 if (!(ndev->flags & IFF_UP) || !netif_carrier_ok(ndev)) {
751 pr_info("%s interface not up.\n", ndev->name);
752 err = -ENETDOWN;
753 goto rel_rt;
754 }
755
756 if (ipv6_addr_is_multicast(&daddr6->sin6_addr)) {
757 pr_info("multi-cast route %pI6 port %u, dev %s.\n",
758 daddr6->sin6_addr.s6_addr,
759 ntohs(daddr6->sin6_port), ndev->name);
760 err = -ENETUNREACH;
761 goto rel_rt;
762 }
763
764 cdev = cxgbi_device_find_by_netdev(ndev, &port);
765 if (!cdev)
766 cdev = cxgbi_device_find_by_mac(ndev, &port);
767 if (!cdev) {
768 pr_info("dst %pI6 %s, NOT cxgbi device.\n",
769 daddr6->sin6_addr.s6_addr, ndev->name);
770 err = -ENETUNREACH;
771 goto rel_rt;
772 }
773 log_debug(1 << CXGBI_DBG_SOCK,
774 "route to %pI6 :%u, ndev p#%d,%s, cdev 0x%p.\n",
775 daddr6->sin6_addr.s6_addr, ntohs(daddr6->sin6_port), port,
776 ndev->name, cdev);
777
778 csk = cxgbi_sock_create(cdev);
779 if (!csk) {
780 err = -ENOMEM;
781 goto rel_rt;
782 }
783 csk->cdev = cdev;
784 csk->port_id = port;
785 csk->mtu = mtu;
786 csk->dst = dst;
787
788 rt6_get_prefsrc(rt, &pref_saddr);
789 if (ipv6_addr_any(&pref_saddr)) {
790 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry *)rt);
791
792 err = ipv6_dev_get_saddr(&init_net, idev ? idev->dev : NULL,
793 &daddr6->sin6_addr, 0, &pref_saddr);
794 if (err) {
795 pr_info("failed to get source address to reach %pI6\n",
796 &daddr6->sin6_addr);
797 goto rel_rt;
798 }
799 }
800
801 csk->csk_family = AF_INET6;
802 csk->daddr6.sin6_addr = daddr6->sin6_addr;
803 csk->daddr6.sin6_port = daddr6->sin6_port;
804 csk->daddr6.sin6_family = daddr6->sin6_family;
805 csk->saddr6.sin6_family = daddr6->sin6_family;
806 csk->saddr6.sin6_addr = pref_saddr;
807
808 neigh_release(n);
809 return csk;
810
811 rel_rt:
812 if (n)
813 neigh_release(n);
814
815 ip6_rt_put(rt);
816 if (csk)
817 cxgbi_sock_closed(csk);
818 err_out:
819 return ERR_PTR(err);
820 }
821 #endif /* IS_ENABLED(CONFIG_IPV6) */
822
823 void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
824 unsigned int opt)
825 {
826 csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
827 dst_confirm(csk->dst);
828 smp_mb();
829 cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
830 }
831 EXPORT_SYMBOL_GPL(cxgbi_sock_established);
832
833 static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
834 {
835 log_debug(1 << CXGBI_DBG_SOCK,
836 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
837 csk, csk->state, csk->flags, csk->user_data);
838
839 if (csk->state != CTP_ESTABLISHED) {
840 read_lock_bh(&csk->callback_lock);
841 if (csk->user_data)
842 iscsi_conn_failure(csk->user_data,
843 ISCSI_ERR_TCP_CONN_CLOSE);
844 read_unlock_bh(&csk->callback_lock);
845 }
846 }
847
848 void cxgbi_sock_closed(struct cxgbi_sock *csk)
849 {
850 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
851 csk, (csk)->state, (csk)->flags, (csk)->tid);
852 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
853 if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
854 return;
855 if (csk->saddr.sin_port)
856 sock_put_port(csk);
857 if (csk->dst)
858 dst_release(csk->dst);
859 csk->cdev->csk_release_offload_resources(csk);
860 cxgbi_sock_set_state(csk, CTP_CLOSED);
861 cxgbi_inform_iscsi_conn_closing(csk);
862 cxgbi_sock_put(csk);
863 }
864 EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
865
866 static void need_active_close(struct cxgbi_sock *csk)
867 {
868 int data_lost;
869 int close_req = 0;
870
871 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
872 csk, (csk)->state, (csk)->flags, (csk)->tid);
873 spin_lock_bh(&csk->lock);
874 if (csk->dst)
875 dst_confirm(csk->dst);
876 data_lost = skb_queue_len(&csk->receive_queue);
877 __skb_queue_purge(&csk->receive_queue);
878
879 if (csk->state == CTP_ACTIVE_OPEN)
880 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
881 else if (csk->state == CTP_ESTABLISHED) {
882 close_req = 1;
883 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
884 } else if (csk->state == CTP_PASSIVE_CLOSE) {
885 close_req = 1;
886 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
887 }
888
889 if (close_req) {
890 if (!cxgbi_sock_flag(csk, CTPF_LOGOUT_RSP_RCVD) ||
891 data_lost)
892 csk->cdev->csk_send_abort_req(csk);
893 else
894 csk->cdev->csk_send_close_req(csk);
895 }
896
897 spin_unlock_bh(&csk->lock);
898 }
899
900 void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
901 {
902 pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
903 csk, csk->state, csk->flags,
904 &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
905 &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
906 errno);
907
908 cxgbi_sock_set_state(csk, CTP_CONNECTING);
909 csk->err = errno;
910 cxgbi_sock_closed(csk);
911 }
912 EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
913
914 void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
915 {
916 struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
917 struct module *owner = csk->cdev->owner;
918
919 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
920 csk, (csk)->state, (csk)->flags, (csk)->tid);
921 cxgbi_sock_get(csk);
922 spin_lock_bh(&csk->lock);
923 if (csk->state == CTP_ACTIVE_OPEN)
924 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
925 spin_unlock_bh(&csk->lock);
926 cxgbi_sock_put(csk);
927 __kfree_skb(skb);
928
929 module_put(owner);
930 }
931 EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
932
933 void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
934 {
935 cxgbi_sock_get(csk);
936 spin_lock_bh(&csk->lock);
937
938 cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
939 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
940 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
941 if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
942 pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
943 csk, csk->state, csk->flags, csk->tid);
944 cxgbi_sock_closed(csk);
945 }
946
947 spin_unlock_bh(&csk->lock);
948 cxgbi_sock_put(csk);
949 }
950 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
951
952 void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
953 {
954 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
955 csk, (csk)->state, (csk)->flags, (csk)->tid);
956 cxgbi_sock_get(csk);
957 spin_lock_bh(&csk->lock);
958
959 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
960 goto done;
961
962 switch (csk->state) {
963 case CTP_ESTABLISHED:
964 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
965 break;
966 case CTP_ACTIVE_CLOSE:
967 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
968 break;
969 case CTP_CLOSE_WAIT_1:
970 cxgbi_sock_closed(csk);
971 break;
972 case CTP_ABORTING:
973 break;
974 default:
975 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
976 csk, csk->state, csk->flags, csk->tid);
977 }
978 cxgbi_inform_iscsi_conn_closing(csk);
979 done:
980 spin_unlock_bh(&csk->lock);
981 cxgbi_sock_put(csk);
982 }
983 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
984
985 void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
986 {
987 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
988 csk, (csk)->state, (csk)->flags, (csk)->tid);
989 cxgbi_sock_get(csk);
990 spin_lock_bh(&csk->lock);
991
992 csk->snd_una = snd_nxt - 1;
993 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
994 goto done;
995
996 switch (csk->state) {
997 case CTP_ACTIVE_CLOSE:
998 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
999 break;
1000 case CTP_CLOSE_WAIT_1:
1001 case CTP_CLOSE_WAIT_2:
1002 cxgbi_sock_closed(csk);
1003 break;
1004 case CTP_ABORTING:
1005 break;
1006 default:
1007 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
1008 csk, csk->state, csk->flags, csk->tid);
1009 }
1010 done:
1011 spin_unlock_bh(&csk->lock);
1012 cxgbi_sock_put(csk);
1013 }
1014 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
1015
1016 void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
1017 unsigned int snd_una, int seq_chk)
1018 {
1019 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1020 "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
1021 csk, csk->state, csk->flags, csk->tid, credits,
1022 csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
1023
1024 spin_lock_bh(&csk->lock);
1025
1026 csk->wr_cred += credits;
1027 if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
1028 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
1029
1030 while (credits) {
1031 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
1032
1033 if (unlikely(!p)) {
1034 pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
1035 csk, csk->state, csk->flags, csk->tid, credits,
1036 csk->wr_cred, csk->wr_una_cred);
1037 break;
1038 }
1039
1040 if (unlikely(credits < p->csum)) {
1041 pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
1042 csk, csk->state, csk->flags, csk->tid,
1043 credits, csk->wr_cred, csk->wr_una_cred,
1044 p->csum);
1045 p->csum -= credits;
1046 break;
1047 } else {
1048 cxgbi_sock_dequeue_wr(csk);
1049 credits -= p->csum;
1050 kfree_skb(p);
1051 }
1052 }
1053
1054 cxgbi_sock_check_wr_invariants(csk);
1055
1056 if (seq_chk) {
1057 if (unlikely(before(snd_una, csk->snd_una))) {
1058 pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
1059 csk, csk->state, csk->flags, csk->tid, snd_una,
1060 csk->snd_una);
1061 goto done;
1062 }
1063
1064 if (csk->snd_una != snd_una) {
1065 csk->snd_una = snd_una;
1066 dst_confirm(csk->dst);
1067 }
1068 }
1069
1070 if (skb_queue_len(&csk->write_queue)) {
1071 if (csk->cdev->csk_push_tx_frames(csk, 0))
1072 cxgbi_conn_tx_open(csk);
1073 } else
1074 cxgbi_conn_tx_open(csk);
1075 done:
1076 spin_unlock_bh(&csk->lock);
1077 }
1078 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
1079
1080 static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
1081 unsigned short mtu)
1082 {
1083 int i = 0;
1084
1085 while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
1086 ++i;
1087
1088 return i;
1089 }
1090
1091 unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
1092 {
1093 unsigned int idx;
1094 struct dst_entry *dst = csk->dst;
1095
1096 csk->advmss = dst_metric_advmss(dst);
1097
1098 if (csk->advmss > pmtu - 40)
1099 csk->advmss = pmtu - 40;
1100 if (csk->advmss < csk->cdev->mtus[0] - 40)
1101 csk->advmss = csk->cdev->mtus[0] - 40;
1102 idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
1103
1104 return idx;
1105 }
1106 EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
1107
1108 void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
1109 {
1110 cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
1111 __skb_queue_tail(&csk->write_queue, skb);
1112 }
1113 EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
1114
1115 void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
1116 {
1117 struct sk_buff *skb;
1118
1119 while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
1120 kfree_skb(skb);
1121 }
1122 EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
1123
1124 void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
1125 {
1126 int pending = cxgbi_sock_count_pending_wrs(csk);
1127
1128 if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
1129 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
1130 csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
1131 }
1132 EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
1133
1134 static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
1135 {
1136 struct cxgbi_device *cdev = csk->cdev;
1137 struct sk_buff *next;
1138 int err, copied = 0;
1139
1140 spin_lock_bh(&csk->lock);
1141
1142 if (csk->state != CTP_ESTABLISHED) {
1143 log_debug(1 << CXGBI_DBG_PDU_TX,
1144 "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
1145 csk, csk->state, csk->flags, csk->tid);
1146 err = -EAGAIN;
1147 goto out_err;
1148 }
1149
1150 if (csk->err) {
1151 log_debug(1 << CXGBI_DBG_PDU_TX,
1152 "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
1153 csk, csk->state, csk->flags, csk->tid, csk->err);
1154 err = -EPIPE;
1155 goto out_err;
1156 }
1157
1158 if (csk->write_seq - csk->snd_una >= csk->snd_win) {
1159 log_debug(1 << CXGBI_DBG_PDU_TX,
1160 "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
1161 csk, csk->state, csk->flags, csk->tid, csk->write_seq,
1162 csk->snd_una, csk->snd_win);
1163 err = -ENOBUFS;
1164 goto out_err;
1165 }
1166
1167 while (skb) {
1168 int frags = skb_shinfo(skb)->nr_frags +
1169 (skb->len != skb->data_len);
1170
1171 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
1172 pr_err("csk 0x%p, skb head %u < %u.\n",
1173 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
1174 err = -EINVAL;
1175 goto out_err;
1176 }
1177
1178 if (frags >= SKB_WR_LIST_SIZE) {
1179 pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
1180 csk, skb_shinfo(skb)->nr_frags, skb->len,
1181 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
1182 err = -EINVAL;
1183 goto out_err;
1184 }
1185
1186 next = skb->next;
1187 skb->next = NULL;
1188 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
1189 cxgbi_sock_skb_entail(csk, skb);
1190 copied += skb->len;
1191 csk->write_seq += skb->len +
1192 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
1193 skb = next;
1194 }
1195
1196 if (likely(skb_queue_len(&csk->write_queue)))
1197 cdev->csk_push_tx_frames(csk, 1);
1198 done:
1199 spin_unlock_bh(&csk->lock);
1200 return copied;
1201
1202 out_err:
1203 if (copied == 0 && err == -EPIPE)
1204 copied = csk->err ? csk->err : -EPIPE;
1205 else
1206 copied = err;
1207 goto done;
1208 }
1209
1210 static inline void
1211 scmd_get_params(struct scsi_cmnd *sc, struct scatterlist **sgl,
1212 unsigned int *sgcnt, unsigned int *dlen,
1213 unsigned int prot)
1214 {
1215 struct scsi_data_buffer *sdb = prot ? scsi_prot(sc) : scsi_out(sc);
1216
1217 *sgl = sdb->table.sgl;
1218 *sgcnt = sdb->table.nents;
1219 *dlen = sdb->length;
1220 /* Caution: for protection sdb, sdb->length is invalid */
1221 }
1222
1223 void cxgbi_ddp_set_one_ppod(struct cxgbi_pagepod *ppod,
1224 struct cxgbi_task_tag_info *ttinfo,
1225 struct scatterlist **sg_pp, unsigned int *sg_off)
1226 {
1227 struct scatterlist *sg = sg_pp ? *sg_pp : NULL;
1228 unsigned int offset = sg_off ? *sg_off : 0;
1229 dma_addr_t addr = 0UL;
1230 unsigned int len = 0;
1231 int i;
1232
1233 memcpy(ppod, &ttinfo->hdr, sizeof(struct cxgbi_pagepod_hdr));
1234
1235 if (sg) {
1236 addr = sg_dma_address(sg);
1237 len = sg_dma_len(sg);
1238 }
1239
1240 for (i = 0; i < PPOD_PAGES_MAX; i++) {
1241 if (sg) {
1242 ppod->addr[i] = cpu_to_be64(addr + offset);
1243 offset += PAGE_SIZE;
1244 if (offset == (len + sg->offset)) {
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 } else {
1253 ppod->addr[i] = 0ULL;
1254 }
1255 }
1256
1257 /*
1258 * the fifth address needs to be repeated in the next ppod, so do
1259 * not move sg
1260 */
1261 if (sg_pp) {
1262 *sg_pp = sg;
1263 *sg_off = offset;
1264 }
1265
1266 if (offset == len) {
1267 offset = 0;
1268 sg = sg_next(sg);
1269 if (sg) {
1270 addr = sg_dma_address(sg);
1271 len = sg_dma_len(sg);
1272 }
1273 }
1274 ppod->addr[i] = sg ? cpu_to_be64(addr + offset) : 0ULL;
1275 }
1276 EXPORT_SYMBOL_GPL(cxgbi_ddp_set_one_ppod);
1277
1278 /*
1279 * APIs interacting with open-iscsi libraries
1280 */
1281
1282 static unsigned char padding[4];
1283
1284 void cxgbi_ddp_ppm_setup(void **ppm_pp, struct cxgbi_device *cdev,
1285 struct cxgbi_tag_format *tformat, unsigned int ppmax,
1286 unsigned int llimit, unsigned int start,
1287 unsigned int rsvd_factor)
1288 {
1289 int err = cxgbi_ppm_init(ppm_pp, cdev->ports[0], cdev->pdev,
1290 cdev->lldev, tformat, ppmax, llimit, start,
1291 rsvd_factor);
1292
1293 if (err >= 0) {
1294 struct cxgbi_ppm *ppm = (struct cxgbi_ppm *)(*ppm_pp);
1295
1296 if (ppm->ppmax < 1024 ||
1297 ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX)
1298 cdev->flags |= CXGBI_FLAG_DDP_OFF;
1299 err = 0;
1300 } else {
1301 cdev->flags |= CXGBI_FLAG_DDP_OFF;
1302 }
1303 }
1304 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppm_setup);
1305
1306 static int cxgbi_ddp_sgl_check(struct scatterlist *sgl, int nents)
1307 {
1308 int i;
1309 int last_sgidx = nents - 1;
1310 struct scatterlist *sg = sgl;
1311
1312 for (i = 0; i < nents; i++, sg = sg_next(sg)) {
1313 unsigned int len = sg->length + sg->offset;
1314
1315 if ((sg->offset & 0x3) || (i && sg->offset) ||
1316 ((i != last_sgidx) && len != PAGE_SIZE)) {
1317 log_debug(1 << CXGBI_DBG_DDP,
1318 "sg %u/%u, %u,%u, not aligned.\n",
1319 i, nents, sg->offset, sg->length);
1320 goto err_out;
1321 }
1322 }
1323 return 0;
1324 err_out:
1325 return -EINVAL;
1326 }
1327
1328 static int cxgbi_ddp_reserve(struct cxgbi_conn *cconn,
1329 struct cxgbi_task_data *tdata, u32 sw_tag,
1330 unsigned int xferlen)
1331 {
1332 struct cxgbi_sock *csk = cconn->cep->csk;
1333 struct cxgbi_device *cdev = csk->cdev;
1334 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1335 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1336 struct scatterlist *sgl = ttinfo->sgl;
1337 unsigned int sgcnt = ttinfo->nents;
1338 unsigned int sg_offset = sgl->offset;
1339 int err;
1340
1341 if (cdev->flags & CXGBI_FLAG_DDP_OFF) {
1342 log_debug(1 << CXGBI_DBG_DDP,
1343 "cdev 0x%p DDP off.\n", cdev);
1344 return -EINVAL;
1345 }
1346
1347 if (!ppm || xferlen < DDP_THRESHOLD || !sgcnt ||
1348 ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX) {
1349 log_debug(1 << CXGBI_DBG_DDP,
1350 "ppm 0x%p, pgidx %u, xfer %u, sgcnt %u, NO ddp.\n",
1351 ppm, ppm ? ppm->tformat.pgsz_idx_dflt : DDP_PGIDX_MAX,
1352 xferlen, ttinfo->nents);
1353 return -EINVAL;
1354 }
1355
1356 /* make sure the buffer is suitable for ddp */
1357 if (cxgbi_ddp_sgl_check(sgl, sgcnt) < 0)
1358 return -EINVAL;
1359
1360 ttinfo->nr_pages = (xferlen + sgl->offset + (1 << PAGE_SHIFT) - 1) >>
1361 PAGE_SHIFT;
1362
1363 /*
1364 * the ddp tag will be used for the itt in the outgoing pdu,
1365 * the itt genrated by libiscsi is saved in the ppm and can be
1366 * retrieved via the ddp tag
1367 */
1368 err = cxgbi_ppm_ppods_reserve(ppm, ttinfo->nr_pages, 0, &ttinfo->idx,
1369 &ttinfo->tag, (unsigned long)sw_tag);
1370 if (err < 0) {
1371 cconn->ddp_full++;
1372 return err;
1373 }
1374 ttinfo->npods = err;
1375
1376 /* setup dma from scsi command sgl */
1377 sgl->offset = 0;
1378 err = dma_map_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1379 sgl->offset = sg_offset;
1380 if (err == 0) {
1381 pr_info("%s: 0x%x, xfer %u, sgl %u dma mapping err.\n",
1382 __func__, sw_tag, xferlen, sgcnt);
1383 goto rel_ppods;
1384 }
1385 if (err != ttinfo->nr_pages) {
1386 log_debug(1 << CXGBI_DBG_DDP,
1387 "%s: sw tag 0x%x, xfer %u, sgl %u, dma count %d.\n",
1388 __func__, sw_tag, xferlen, sgcnt, err);
1389 }
1390
1391 ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_MAPPED;
1392 ttinfo->cid = csk->port_id;
1393
1394 cxgbi_ppm_make_ppod_hdr(ppm, ttinfo->tag, csk->tid, sgl->offset,
1395 xferlen, &ttinfo->hdr);
1396
1397 if (cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ) {
1398 /* write ppod from xmit_pdu (of iscsi_scsi_command pdu) */
1399 ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_VALID;
1400 } else {
1401 /* write ppod from control queue now */
1402 err = cdev->csk_ddp_set_map(ppm, csk, ttinfo);
1403 if (err < 0)
1404 goto rel_ppods;
1405 }
1406
1407 return 0;
1408
1409 rel_ppods:
1410 cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1411
1412 if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_MAPPED) {
1413 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_MAPPED;
1414 dma_unmap_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1415 }
1416 return -EINVAL;
1417 }
1418
1419 static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1420 {
1421 struct scsi_cmnd *sc = task->sc;
1422 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1423 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1424 struct cxgbi_device *cdev = cconn->chba->cdev;
1425 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1426 u32 tag = ntohl((__force u32)hdr_itt);
1427
1428 log_debug(1 << CXGBI_DBG_DDP,
1429 "cdev 0x%p, task 0x%p, release tag 0x%x.\n",
1430 cdev, task, tag);
1431 if (sc &&
1432 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
1433 cxgbi_ppm_is_ddp_tag(ppm, tag)) {
1434 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1435 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1436
1437 if (!(cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ))
1438 cdev->csk_ddp_clear_map(cdev, ppm, ttinfo);
1439 cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1440 dma_unmap_sg(&ppm->pdev->dev, ttinfo->sgl, ttinfo->nents,
1441 DMA_FROM_DEVICE);
1442 }
1443 }
1444
1445 static inline u32 cxgbi_build_sw_tag(u32 idx, u32 age)
1446 {
1447 /* assume idx and age both are < 0x7FFF (32767) */
1448 return (idx << 16) | age;
1449 }
1450
1451 static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1452 {
1453 struct scsi_cmnd *sc = task->sc;
1454 struct iscsi_conn *conn = task->conn;
1455 struct iscsi_session *sess = conn->session;
1456 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1457 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1458 struct cxgbi_device *cdev = cconn->chba->cdev;
1459 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1460 u32 sw_tag = cxgbi_build_sw_tag(task->itt, sess->age);
1461 u32 tag = 0;
1462 int err = -EINVAL;
1463
1464 if (sc &&
1465 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)
1466 ) {
1467 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1468 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1469
1470 scmd_get_params(sc, &ttinfo->sgl, &ttinfo->nents,
1471 &tdata->dlen, 0);
1472 err = cxgbi_ddp_reserve(cconn, tdata, sw_tag, tdata->dlen);
1473 if (!err)
1474 tag = ttinfo->tag;
1475 else
1476 log_debug(1 << CXGBI_DBG_DDP,
1477 "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1478 cconn->cep->csk, task, tdata->dlen,
1479 ttinfo->nents);
1480 }
1481
1482 if (err < 0) {
1483 err = cxgbi_ppm_make_non_ddp_tag(ppm, sw_tag, &tag);
1484 if (err < 0)
1485 return err;
1486 }
1487 /* the itt need to sent in big-endian order */
1488 *hdr_itt = (__force itt_t)htonl(tag);
1489
1490 log_debug(1 << CXGBI_DBG_DDP,
1491 "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1492 cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1493 return 0;
1494 }
1495
1496 void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1497 {
1498 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1499 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1500 struct cxgbi_device *cdev = cconn->chba->cdev;
1501 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1502 u32 tag = ntohl((__force u32)itt);
1503 u32 sw_bits;
1504
1505 if (ppm) {
1506 if (cxgbi_ppm_is_ddp_tag(ppm, tag))
1507 sw_bits = cxgbi_ppm_get_tag_caller_data(ppm, tag);
1508 else
1509 sw_bits = cxgbi_ppm_decode_non_ddp_tag(ppm, tag);
1510 } else {
1511 sw_bits = tag;
1512 }
1513
1514 cxgbi_decode_sw_tag(sw_bits, idx, age);
1515 log_debug(1 << CXGBI_DBG_DDP,
1516 "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1517 cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1518 age ? *age : 0xFF);
1519 }
1520 EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1521
1522 void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1523 {
1524 struct iscsi_conn *conn = csk->user_data;
1525
1526 if (conn) {
1527 log_debug(1 << CXGBI_DBG_SOCK,
1528 "csk 0x%p, cid %d.\n", csk, conn->id);
1529 iscsi_conn_queue_work(conn);
1530 }
1531 }
1532 EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1533
1534 /*
1535 * pdu receive, interact with libiscsi_tcp
1536 */
1537 static inline int read_pdu_skb(struct iscsi_conn *conn,
1538 struct sk_buff *skb,
1539 unsigned int offset,
1540 int offloaded)
1541 {
1542 int status = 0;
1543 int bytes_read;
1544
1545 bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1546 switch (status) {
1547 case ISCSI_TCP_CONN_ERR:
1548 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1549 skb, offset, offloaded);
1550 return -EIO;
1551 case ISCSI_TCP_SUSPENDED:
1552 log_debug(1 << CXGBI_DBG_PDU_RX,
1553 "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1554 skb, offset, offloaded, bytes_read);
1555 /* no transfer - just have caller flush queue */
1556 return bytes_read;
1557 case ISCSI_TCP_SKB_DONE:
1558 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1559 skb, offset, offloaded);
1560 /*
1561 * pdus should always fit in the skb and we should get
1562 * segment done notifcation.
1563 */
1564 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1565 return -EFAULT;
1566 case ISCSI_TCP_SEGMENT_DONE:
1567 log_debug(1 << CXGBI_DBG_PDU_RX,
1568 "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1569 skb, offset, offloaded, bytes_read);
1570 return bytes_read;
1571 default:
1572 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1573 skb, offset, offloaded, status);
1574 return -EINVAL;
1575 }
1576 }
1577
1578 static int
1579 skb_read_pdu_bhs(struct cxgbi_sock *csk, struct iscsi_conn *conn,
1580 struct sk_buff *skb)
1581 {
1582 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1583 int err;
1584
1585 log_debug(1 << CXGBI_DBG_PDU_RX,
1586 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1587 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1588
1589 if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1590 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1591 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1592 return -EIO;
1593 }
1594
1595 if (conn->hdrdgst_en &&
1596 cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1597 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1598 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1599 return -EIO;
1600 }
1601
1602 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_ISCSI_COMPL) &&
1603 cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA_DDPD)) {
1604 /* If completion flag is set and data is directly
1605 * placed in to the host memory then update
1606 * task->exp_datasn to the datasn in completion
1607 * iSCSI hdr as T6 adapter generates completion only
1608 * for the last pdu of a sequence.
1609 */
1610 itt_t itt = ((struct iscsi_data *)skb->data)->itt;
1611 struct iscsi_task *task = iscsi_itt_to_ctask(conn, itt);
1612 u32 data_sn = be32_to_cpu(((struct iscsi_data *)
1613 skb->data)->datasn);
1614 if (task && task->sc) {
1615 struct iscsi_tcp_task *tcp_task = task->dd_data;
1616
1617 tcp_task->exp_datasn = data_sn;
1618 }
1619 }
1620
1621 err = read_pdu_skb(conn, skb, 0, 0);
1622 if (likely(err >= 0)) {
1623 struct iscsi_hdr *hdr = (struct iscsi_hdr *)skb->data;
1624 u8 opcode = hdr->opcode & ISCSI_OPCODE_MASK;
1625
1626 if (unlikely(opcode == ISCSI_OP_LOGOUT_RSP))
1627 cxgbi_sock_set_flag(csk, CTPF_LOGOUT_RSP_RCVD);
1628 }
1629
1630 return err;
1631 }
1632
1633 static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1634 struct sk_buff *skb, unsigned int offset)
1635 {
1636 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1637 bool offloaded = 0;
1638 int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1639
1640 log_debug(1 << CXGBI_DBG_PDU_RX,
1641 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1642 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1643
1644 if (conn->datadgst_en &&
1645 cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1646 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1647 conn, lskb, cxgbi_skcb_flags(lskb));
1648 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1649 return -EIO;
1650 }
1651
1652 if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1653 return 0;
1654
1655 /* coalesced, add header digest length */
1656 if (lskb == skb && conn->hdrdgst_en)
1657 offset += ISCSI_DIGEST_SIZE;
1658
1659 if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1660 offloaded = 1;
1661
1662 if (opcode == ISCSI_OP_SCSI_DATA_IN)
1663 log_debug(1 << CXGBI_DBG_PDU_RX,
1664 "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1665 skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1666 tcp_conn->in.datalen, offloaded ? "is" : "not");
1667
1668 return read_pdu_skb(conn, skb, offset, offloaded);
1669 }
1670
1671 static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1672 {
1673 struct cxgbi_device *cdev = csk->cdev;
1674 int must_send;
1675 u32 credits;
1676
1677 log_debug(1 << CXGBI_DBG_PDU_RX,
1678 "csk 0x%p,%u,0x%lx,%u, seq %u, wup %u, thre %u, %u.\n",
1679 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1680 csk->rcv_wup, cdev->rx_credit_thres,
1681 csk->rcv_win);
1682
1683 if (!cdev->rx_credit_thres)
1684 return;
1685
1686 if (csk->state != CTP_ESTABLISHED)
1687 return;
1688
1689 credits = csk->copied_seq - csk->rcv_wup;
1690 if (unlikely(!credits))
1691 return;
1692 must_send = credits + 16384 >= csk->rcv_win;
1693 if (must_send || credits >= cdev->rx_credit_thres)
1694 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1695 }
1696
1697 void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1698 {
1699 struct cxgbi_device *cdev = csk->cdev;
1700 struct iscsi_conn *conn = csk->user_data;
1701 struct sk_buff *skb;
1702 unsigned int read = 0;
1703 int err = 0;
1704
1705 log_debug(1 << CXGBI_DBG_PDU_RX,
1706 "csk 0x%p, conn 0x%p.\n", csk, conn);
1707
1708 if (unlikely(!conn || conn->suspend_rx)) {
1709 log_debug(1 << CXGBI_DBG_PDU_RX,
1710 "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1711 csk, conn, conn ? conn->id : 0xFF,
1712 conn ? conn->suspend_rx : 0xFF);
1713 return;
1714 }
1715
1716 while (!err) {
1717 skb = skb_peek(&csk->receive_queue);
1718 if (!skb ||
1719 !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1720 if (skb)
1721 log_debug(1 << CXGBI_DBG_PDU_RX,
1722 "skb 0x%p, NOT ready 0x%lx.\n",
1723 skb, cxgbi_skcb_flags(skb));
1724 break;
1725 }
1726 __skb_unlink(skb, &csk->receive_queue);
1727
1728 read += cxgbi_skcb_rx_pdulen(skb);
1729 log_debug(1 << CXGBI_DBG_PDU_RX,
1730 "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1731 csk, skb, skb->len, cxgbi_skcb_flags(skb),
1732 cxgbi_skcb_rx_pdulen(skb));
1733
1734 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1735 err = skb_read_pdu_bhs(csk, conn, skb);
1736 if (err < 0) {
1737 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1738 "f 0x%lx, plen %u.\n",
1739 csk, skb, skb->len,
1740 cxgbi_skcb_flags(skb),
1741 cxgbi_skcb_rx_pdulen(skb));
1742 goto skb_done;
1743 }
1744 err = skb_read_pdu_data(conn, skb, skb,
1745 err + cdev->skb_rx_extra);
1746 if (err < 0)
1747 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1748 "f 0x%lx, plen %u.\n",
1749 csk, skb, skb->len,
1750 cxgbi_skcb_flags(skb),
1751 cxgbi_skcb_rx_pdulen(skb));
1752 } else {
1753 err = skb_read_pdu_bhs(csk, conn, skb);
1754 if (err < 0) {
1755 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1756 "f 0x%lx, plen %u.\n",
1757 csk, skb, skb->len,
1758 cxgbi_skcb_flags(skb),
1759 cxgbi_skcb_rx_pdulen(skb));
1760 goto skb_done;
1761 }
1762
1763 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1764 struct sk_buff *dskb;
1765
1766 dskb = skb_peek(&csk->receive_queue);
1767 if (!dskb) {
1768 pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1769 " plen %u, NO data.\n",
1770 csk, skb, skb->len,
1771 cxgbi_skcb_flags(skb),
1772 cxgbi_skcb_rx_pdulen(skb));
1773 err = -EIO;
1774 goto skb_done;
1775 }
1776 __skb_unlink(dskb, &csk->receive_queue);
1777
1778 err = skb_read_pdu_data(conn, skb, dskb, 0);
1779 if (err < 0)
1780 pr_err("data, csk 0x%p, skb 0x%p,%u, "
1781 "f 0x%lx, plen %u, dskb 0x%p,"
1782 "%u.\n",
1783 csk, skb, skb->len,
1784 cxgbi_skcb_flags(skb),
1785 cxgbi_skcb_rx_pdulen(skb),
1786 dskb, dskb->len);
1787 __kfree_skb(dskb);
1788 } else
1789 err = skb_read_pdu_data(conn, skb, skb, 0);
1790 }
1791 skb_done:
1792 __kfree_skb(skb);
1793
1794 if (err < 0)
1795 break;
1796 }
1797
1798 log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
1799 if (read) {
1800 csk->copied_seq += read;
1801 csk_return_rx_credits(csk, read);
1802 conn->rxdata_octets += read;
1803 }
1804
1805 if (err < 0) {
1806 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
1807 csk, conn, err, read);
1808 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1809 }
1810 }
1811 EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
1812
1813 static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
1814 unsigned int offset, unsigned int *off,
1815 struct scatterlist **sgp)
1816 {
1817 int i;
1818 struct scatterlist *sg;
1819
1820 for_each_sg(sgl, sg, sgcnt, i) {
1821 if (offset < sg->length) {
1822 *off = offset;
1823 *sgp = sg;
1824 return 0;
1825 }
1826 offset -= sg->length;
1827 }
1828 return -EFAULT;
1829 }
1830
1831 static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
1832 unsigned int dlen, struct page_frag *frags,
1833 int frag_max)
1834 {
1835 unsigned int datalen = dlen;
1836 unsigned int sglen = sg->length - sgoffset;
1837 struct page *page = sg_page(sg);
1838 int i;
1839
1840 i = 0;
1841 do {
1842 unsigned int copy;
1843
1844 if (!sglen) {
1845 sg = sg_next(sg);
1846 if (!sg) {
1847 pr_warn("sg %d NULL, len %u/%u.\n",
1848 i, datalen, dlen);
1849 return -EINVAL;
1850 }
1851 sgoffset = 0;
1852 sglen = sg->length;
1853 page = sg_page(sg);
1854
1855 }
1856 copy = min(datalen, sglen);
1857 if (i && page == frags[i - 1].page &&
1858 sgoffset + sg->offset ==
1859 frags[i - 1].offset + frags[i - 1].size) {
1860 frags[i - 1].size += copy;
1861 } else {
1862 if (i >= frag_max) {
1863 pr_warn("too many pages %u, dlen %u.\n",
1864 frag_max, dlen);
1865 return -EINVAL;
1866 }
1867
1868 frags[i].page = page;
1869 frags[i].offset = sg->offset + sgoffset;
1870 frags[i].size = copy;
1871 i++;
1872 }
1873 datalen -= copy;
1874 sgoffset += copy;
1875 sglen -= copy;
1876 } while (datalen);
1877
1878 return i;
1879 }
1880
1881 int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
1882 {
1883 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1884 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1885 struct cxgbi_device *cdev = cconn->chba->cdev;
1886 struct iscsi_conn *conn = task->conn;
1887 struct iscsi_tcp_task *tcp_task = task->dd_data;
1888 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1889 struct scsi_cmnd *sc = task->sc;
1890 struct cxgbi_sock *csk = cconn->cep->csk;
1891 struct net_device *ndev = cdev->ports[csk->port_id];
1892 int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
1893
1894 tcp_task->dd_data = tdata;
1895 task->hdr = NULL;
1896
1897 if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
1898 (opcode == ISCSI_OP_SCSI_DATA_OUT ||
1899 (opcode == ISCSI_OP_SCSI_CMD &&
1900 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
1901 /* data could goes into skb head */
1902 headroom += min_t(unsigned int,
1903 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
1904 conn->max_xmit_dlength);
1905
1906 tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
1907 if (!tdata->skb) {
1908 ndev->stats.tx_dropped++;
1909 return -ENOMEM;
1910 }
1911
1912 skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
1913
1914 if (task->sc) {
1915 task->hdr = (struct iscsi_hdr *)tdata->skb->data;
1916 } else {
1917 task->hdr = kzalloc(SKB_TX_ISCSI_PDU_HEADER_MAX, GFP_ATOMIC);
1918 if (!task->hdr) {
1919 __kfree_skb(tdata->skb);
1920 tdata->skb = NULL;
1921 ndev->stats.tx_dropped++;
1922 return -ENOMEM;
1923 }
1924 }
1925 task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
1926
1927 /* data_out uses scsi_cmd's itt */
1928 if (opcode != ISCSI_OP_SCSI_DATA_OUT)
1929 task_reserve_itt(task, &task->hdr->itt);
1930
1931 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1932 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
1933 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
1934 conn->max_xmit_dlength, ntohl(task->hdr->itt));
1935
1936 return 0;
1937 }
1938 EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
1939
1940 static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
1941 {
1942 if (hcrc || dcrc) {
1943 u8 submode = 0;
1944
1945 if (hcrc)
1946 submode |= 1;
1947 if (dcrc)
1948 submode |= 2;
1949 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
1950 } else
1951 cxgbi_skcb_ulp_mode(skb) = 0;
1952 }
1953
1954 int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
1955 unsigned int count)
1956 {
1957 struct iscsi_conn *conn = task->conn;
1958 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1959 struct sk_buff *skb = tdata->skb;
1960 unsigned int datalen = count;
1961 int i, padlen = iscsi_padding(count);
1962 struct page *pg;
1963
1964 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1965 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
1966 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
1967 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
1968
1969 skb_put(skb, task->hdr_len);
1970 tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
1971 if (!count)
1972 return 0;
1973
1974 if (task->sc) {
1975 struct scsi_data_buffer *sdb = scsi_out(task->sc);
1976 struct scatterlist *sg = NULL;
1977 int err;
1978
1979 tdata->offset = offset;
1980 tdata->count = count;
1981 err = sgl_seek_offset(
1982 sdb->table.sgl, sdb->table.nents,
1983 tdata->offset, &tdata->sgoffset, &sg);
1984 if (err < 0) {
1985 pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
1986 sdb->table.nents, tdata->offset, sdb->length);
1987 return err;
1988 }
1989 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
1990 tdata->frags, MAX_PDU_FRAGS);
1991 if (err < 0) {
1992 pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
1993 sdb->table.nents, tdata->offset, tdata->count);
1994 return err;
1995 }
1996 tdata->nr_frags = err;
1997
1998 if (tdata->nr_frags > MAX_SKB_FRAGS ||
1999 (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
2000 char *dst = skb->data + task->hdr_len;
2001 struct page_frag *frag = tdata->frags;
2002
2003 /* data fits in the skb's headroom */
2004 for (i = 0; i < tdata->nr_frags; i++, frag++) {
2005 char *src = kmap_atomic(frag->page);
2006
2007 memcpy(dst, src+frag->offset, frag->size);
2008 dst += frag->size;
2009 kunmap_atomic(src);
2010 }
2011 if (padlen) {
2012 memset(dst, 0, padlen);
2013 padlen = 0;
2014 }
2015 skb_put(skb, count + padlen);
2016 } else {
2017 /* data fit into frag_list */
2018 for (i = 0; i < tdata->nr_frags; i++) {
2019 __skb_fill_page_desc(skb, i,
2020 tdata->frags[i].page,
2021 tdata->frags[i].offset,
2022 tdata->frags[i].size);
2023 skb_frag_ref(skb, i);
2024 }
2025 skb_shinfo(skb)->nr_frags = tdata->nr_frags;
2026 skb->len += count;
2027 skb->data_len += count;
2028 skb->truesize += count;
2029 }
2030
2031 } else {
2032 pg = virt_to_page(task->data);
2033
2034 get_page(pg);
2035 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
2036 count);
2037 skb->len += count;
2038 skb->data_len += count;
2039 skb->truesize += count;
2040 }
2041
2042 if (padlen) {
2043 i = skb_shinfo(skb)->nr_frags;
2044 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
2045 virt_to_page(padding), offset_in_page(padding),
2046 padlen);
2047
2048 skb->data_len += padlen;
2049 skb->truesize += padlen;
2050 skb->len += padlen;
2051 }
2052
2053 return 0;
2054 }
2055 EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
2056
2057 int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2058 {
2059 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2060 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2061 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2062 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
2063 struct sk_buff *skb = tdata->skb;
2064 struct cxgbi_sock *csk = NULL;
2065 unsigned int datalen;
2066 int err;
2067
2068 if (!skb) {
2069 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2070 "task 0x%p\n", task);
2071 return 0;
2072 }
2073
2074 if (cconn && cconn->cep)
2075 csk = cconn->cep->csk;
2076 if (!csk) {
2077 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2078 "task 0x%p, csk gone.\n", task);
2079 return -EPIPE;
2080 }
2081
2082 tdata->skb = NULL;
2083 datalen = skb->data_len;
2084
2085 /* write ppod first if using ofldq to write ppod */
2086 if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_VALID) {
2087 struct cxgbi_ppm *ppm = csk->cdev->cdev2ppm(csk->cdev);
2088
2089 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_VALID;
2090 if (csk->cdev->csk_ddp_set_map(ppm, csk, ttinfo) < 0)
2091 pr_err("task 0x%p, ppod writing using ofldq failed.\n",
2092 task);
2093 /* continue. Let fl get the data */
2094 }
2095
2096 if (!task->sc)
2097 memcpy(skb->data, task->hdr, SKB_TX_ISCSI_PDU_HEADER_MAX);
2098
2099 err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2100 if (err > 0) {
2101 int pdulen = err;
2102
2103 log_debug(1 << CXGBI_DBG_PDU_TX,
2104 "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2105 task, task->sc, skb, skb->len, skb->data_len, err);
2106
2107 if (task->conn->hdrdgst_en)
2108 pdulen += ISCSI_DIGEST_SIZE;
2109
2110 if (datalen && task->conn->datadgst_en)
2111 pdulen += ISCSI_DIGEST_SIZE;
2112
2113 task->conn->txdata_octets += pdulen;
2114 return 0;
2115 }
2116
2117 if (err == -EAGAIN || err == -ENOBUFS) {
2118 log_debug(1 << CXGBI_DBG_PDU_TX,
2119 "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2120 task, skb, skb->len, skb->data_len, err);
2121 /* reset skb to send when we are called again */
2122 tdata->skb = skb;
2123 return err;
2124 }
2125
2126 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2127 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2128 task->itt, skb, skb->len, skb->data_len, err);
2129
2130 __kfree_skb(skb);
2131
2132 iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2133 iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2134 return err;
2135 }
2136 EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2137
2138 void cxgbi_cleanup_task(struct iscsi_task *task)
2139 {
2140 struct iscsi_tcp_task *tcp_task = task->dd_data;
2141 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2142
2143 if (!tcp_task || !tdata || (tcp_task->dd_data != tdata)) {
2144 pr_info("task 0x%p,0x%p, tcp_task 0x%p, tdata 0x%p/0x%p.\n",
2145 task, task->sc, tcp_task,
2146 tcp_task ? tcp_task->dd_data : NULL, tdata);
2147 return;
2148 }
2149
2150 log_debug(1 << CXGBI_DBG_ISCSI,
2151 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2152 task, tdata->skb, task->hdr_itt);
2153
2154 tcp_task->dd_data = NULL;
2155
2156 if (!task->sc)
2157 kfree(task->hdr);
2158 task->hdr = NULL;
2159
2160 /* never reached the xmit task callout */
2161 if (tdata->skb) {
2162 __kfree_skb(tdata->skb);
2163 tdata->skb = NULL;
2164 }
2165
2166 task_release_itt(task, task->hdr_itt);
2167 memset(tdata, 0, sizeof(*tdata));
2168
2169 iscsi_tcp_cleanup_task(task);
2170 }
2171 EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2172
2173 void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2174 struct iscsi_stats *stats)
2175 {
2176 struct iscsi_conn *conn = cls_conn->dd_data;
2177
2178 stats->txdata_octets = conn->txdata_octets;
2179 stats->rxdata_octets = conn->rxdata_octets;
2180 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2181 stats->dataout_pdus = conn->dataout_pdus_cnt;
2182 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2183 stats->datain_pdus = conn->datain_pdus_cnt;
2184 stats->r2t_pdus = conn->r2t_pdus_cnt;
2185 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2186 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2187 stats->digest_err = 0;
2188 stats->timeout_err = 0;
2189 stats->custom_length = 1;
2190 strcpy(stats->custom[0].desc, "eh_abort_cnt");
2191 stats->custom[0].value = conn->eh_abort_cnt;
2192 }
2193 EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2194
2195 static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2196 {
2197 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2198 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2199 struct cxgbi_device *cdev = cconn->chba->cdev;
2200 unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2201 unsigned int max_def = 512 * MAX_SKB_FRAGS;
2202 unsigned int max = max(max_def, headroom);
2203
2204 max = min(cconn->chba->cdev->tx_max_size, max);
2205 if (conn->max_xmit_dlength)
2206 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2207 else
2208 conn->max_xmit_dlength = max;
2209 cxgbi_align_pdu_size(conn->max_xmit_dlength);
2210
2211 return 0;
2212 }
2213
2214 static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2215 {
2216 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2217 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2218 unsigned int max = cconn->chba->cdev->rx_max_size;
2219
2220 cxgbi_align_pdu_size(max);
2221
2222 if (conn->max_recv_dlength) {
2223 if (conn->max_recv_dlength > max) {
2224 pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2225 conn->max_recv_dlength, max);
2226 return -EINVAL;
2227 }
2228 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2229 cxgbi_align_pdu_size(conn->max_recv_dlength);
2230 } else
2231 conn->max_recv_dlength = max;
2232
2233 return 0;
2234 }
2235
2236 int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2237 enum iscsi_param param, char *buf, int buflen)
2238 {
2239 struct iscsi_conn *conn = cls_conn->dd_data;
2240 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2241 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2242 struct cxgbi_sock *csk = cconn->cep->csk;
2243 int err;
2244
2245 log_debug(1 << CXGBI_DBG_ISCSI,
2246 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2247 cls_conn, param, buflen, buf);
2248
2249 switch (param) {
2250 case ISCSI_PARAM_HDRDGST_EN:
2251 err = iscsi_set_param(cls_conn, param, buf, buflen);
2252 if (!err && conn->hdrdgst_en)
2253 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2254 conn->hdrdgst_en,
2255 conn->datadgst_en);
2256 break;
2257 case ISCSI_PARAM_DATADGST_EN:
2258 err = iscsi_set_param(cls_conn, param, buf, buflen);
2259 if (!err && conn->datadgst_en)
2260 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2261 conn->hdrdgst_en,
2262 conn->datadgst_en);
2263 break;
2264 case ISCSI_PARAM_MAX_R2T:
2265 return iscsi_tcp_set_max_r2t(conn, buf);
2266 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2267 err = iscsi_set_param(cls_conn, param, buf, buflen);
2268 if (!err)
2269 err = cxgbi_conn_max_recv_dlength(conn);
2270 break;
2271 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2272 err = iscsi_set_param(cls_conn, param, buf, buflen);
2273 if (!err)
2274 err = cxgbi_conn_max_xmit_dlength(conn);
2275 break;
2276 default:
2277 return iscsi_set_param(cls_conn, param, buf, buflen);
2278 }
2279 return err;
2280 }
2281 EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2282
2283 static inline int csk_print_port(struct cxgbi_sock *csk, char *buf)
2284 {
2285 int len;
2286
2287 cxgbi_sock_get(csk);
2288 len = sprintf(buf, "%hu\n", ntohs(csk->daddr.sin_port));
2289 cxgbi_sock_put(csk);
2290
2291 return len;
2292 }
2293
2294 static inline int csk_print_ip(struct cxgbi_sock *csk, char *buf)
2295 {
2296 int len;
2297
2298 cxgbi_sock_get(csk);
2299 if (csk->csk_family == AF_INET)
2300 len = sprintf(buf, "%pI4",
2301 &csk->daddr.sin_addr.s_addr);
2302 else
2303 len = sprintf(buf, "%pI6",
2304 &csk->daddr6.sin6_addr);
2305
2306 cxgbi_sock_put(csk);
2307
2308 return len;
2309 }
2310
2311 int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2312 char *buf)
2313 {
2314 struct cxgbi_endpoint *cep = ep->dd_data;
2315 struct cxgbi_sock *csk;
2316 int len;
2317
2318 log_debug(1 << CXGBI_DBG_ISCSI,
2319 "cls_conn 0x%p, param %d.\n", ep, param);
2320
2321 switch (param) {
2322 case ISCSI_PARAM_CONN_PORT:
2323 case ISCSI_PARAM_CONN_ADDRESS:
2324 if (!cep)
2325 return -ENOTCONN;
2326
2327 csk = cep->csk;
2328 if (!csk)
2329 return -ENOTCONN;
2330
2331 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2332 &csk->daddr, param, buf);
2333 default:
2334 return -ENOSYS;
2335 }
2336 return len;
2337 }
2338 EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
2339
2340 struct iscsi_cls_conn *
2341 cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2342 {
2343 struct iscsi_cls_conn *cls_conn;
2344 struct iscsi_conn *conn;
2345 struct iscsi_tcp_conn *tcp_conn;
2346 struct cxgbi_conn *cconn;
2347
2348 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2349 if (!cls_conn)
2350 return NULL;
2351
2352 conn = cls_conn->dd_data;
2353 tcp_conn = conn->dd_data;
2354 cconn = tcp_conn->dd_data;
2355 cconn->iconn = conn;
2356
2357 log_debug(1 << CXGBI_DBG_ISCSI,
2358 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2359 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2360
2361 return cls_conn;
2362 }
2363 EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2364
2365 int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2366 struct iscsi_cls_conn *cls_conn,
2367 u64 transport_eph, int is_leading)
2368 {
2369 struct iscsi_conn *conn = cls_conn->dd_data;
2370 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2371 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2372 struct cxgbi_ppm *ppm;
2373 struct iscsi_endpoint *ep;
2374 struct cxgbi_endpoint *cep;
2375 struct cxgbi_sock *csk;
2376 int err;
2377
2378 ep = iscsi_lookup_endpoint(transport_eph);
2379 if (!ep)
2380 return -EINVAL;
2381
2382 /* setup ddp pagesize */
2383 cep = ep->dd_data;
2384 csk = cep->csk;
2385
2386 ppm = csk->cdev->cdev2ppm(csk->cdev);
2387 err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid,
2388 ppm->tformat.pgsz_idx_dflt);
2389 if (err < 0)
2390 return err;
2391
2392 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2393 if (err)
2394 return -EINVAL;
2395
2396 /* calculate the tag idx bits needed for this conn based on cmds_max */
2397 cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2398
2399 write_lock_bh(&csk->callback_lock);
2400 csk->user_data = conn;
2401 cconn->chba = cep->chba;
2402 cconn->cep = cep;
2403 cep->cconn = cconn;
2404 write_unlock_bh(&csk->callback_lock);
2405
2406 cxgbi_conn_max_xmit_dlength(conn);
2407 cxgbi_conn_max_recv_dlength(conn);
2408
2409 log_debug(1 << CXGBI_DBG_ISCSI,
2410 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2411 cls_session, cls_conn, ep, cconn, csk);
2412 /* init recv engine */
2413 iscsi_tcp_hdr_recv_prep(tcp_conn);
2414
2415 return 0;
2416 }
2417 EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2418
2419 struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2420 u16 cmds_max, u16 qdepth,
2421 u32 initial_cmdsn)
2422 {
2423 struct cxgbi_endpoint *cep;
2424 struct cxgbi_hba *chba;
2425 struct Scsi_Host *shost;
2426 struct iscsi_cls_session *cls_session;
2427 struct iscsi_session *session;
2428
2429 if (!ep) {
2430 pr_err("missing endpoint.\n");
2431 return NULL;
2432 }
2433
2434 cep = ep->dd_data;
2435 chba = cep->chba;
2436 shost = chba->shost;
2437
2438 BUG_ON(chba != iscsi_host_priv(shost));
2439
2440 cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2441 cmds_max, 0,
2442 sizeof(struct iscsi_tcp_task) +
2443 sizeof(struct cxgbi_task_data),
2444 initial_cmdsn, ISCSI_MAX_TARGET);
2445 if (!cls_session)
2446 return NULL;
2447
2448 session = cls_session->dd_data;
2449 if (iscsi_tcp_r2tpool_alloc(session))
2450 goto remove_session;
2451
2452 log_debug(1 << CXGBI_DBG_ISCSI,
2453 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2454 return cls_session;
2455
2456 remove_session:
2457 iscsi_session_teardown(cls_session);
2458 return NULL;
2459 }
2460 EXPORT_SYMBOL_GPL(cxgbi_create_session);
2461
2462 void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2463 {
2464 log_debug(1 << CXGBI_DBG_ISCSI,
2465 "cls sess 0x%p.\n", cls_session);
2466
2467 iscsi_tcp_r2tpool_free(cls_session->dd_data);
2468 iscsi_session_teardown(cls_session);
2469 }
2470 EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2471
2472 int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2473 char *buf, int buflen)
2474 {
2475 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2476
2477 if (!chba->ndev) {
2478 shost_printk(KERN_ERR, shost, "Could not get host param. "
2479 "netdev for host not set.\n");
2480 return -ENODEV;
2481 }
2482
2483 log_debug(1 << CXGBI_DBG_ISCSI,
2484 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2485 shost, chba, chba->ndev->name, param, buflen, buf);
2486
2487 switch (param) {
2488 case ISCSI_HOST_PARAM_IPADDRESS:
2489 {
2490 __be32 addr = in_aton(buf);
2491 log_debug(1 << CXGBI_DBG_ISCSI,
2492 "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2493 cxgbi_set_iscsi_ipv4(chba, addr);
2494 return 0;
2495 }
2496 case ISCSI_HOST_PARAM_HWADDRESS:
2497 case ISCSI_HOST_PARAM_NETDEV_NAME:
2498 return 0;
2499 default:
2500 return iscsi_host_set_param(shost, param, buf, buflen);
2501 }
2502 }
2503 EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2504
2505 int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2506 char *buf)
2507 {
2508 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2509 int len = 0;
2510
2511 if (!chba->ndev) {
2512 shost_printk(KERN_ERR, shost, "Could not get host param. "
2513 "netdev for host not set.\n");
2514 return -ENODEV;
2515 }
2516
2517 log_debug(1 << CXGBI_DBG_ISCSI,
2518 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2519 shost, chba, chba->ndev->name, param);
2520
2521 switch (param) {
2522 case ISCSI_HOST_PARAM_HWADDRESS:
2523 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2524 break;
2525 case ISCSI_HOST_PARAM_NETDEV_NAME:
2526 len = sprintf(buf, "%s\n", chba->ndev->name);
2527 break;
2528 case ISCSI_HOST_PARAM_IPADDRESS:
2529 {
2530 struct cxgbi_sock *csk = find_sock_on_port(chba->cdev,
2531 chba->port_id);
2532 if (csk) {
2533 len = sprintf(buf, "%pIS",
2534 (struct sockaddr *)&csk->saddr);
2535 }
2536 log_debug(1 << CXGBI_DBG_ISCSI,
2537 "hba %s, addr %s.\n", chba->ndev->name, buf);
2538 break;
2539 }
2540 default:
2541 return iscsi_host_get_param(shost, param, buf);
2542 }
2543
2544 return len;
2545 }
2546 EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2547
2548 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2549 struct sockaddr *dst_addr,
2550 int non_blocking)
2551 {
2552 struct iscsi_endpoint *ep;
2553 struct cxgbi_endpoint *cep;
2554 struct cxgbi_hba *hba = NULL;
2555 struct cxgbi_sock *csk;
2556 int ifindex = 0;
2557 int err = -EINVAL;
2558
2559 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2560 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2561 shost, non_blocking, dst_addr);
2562
2563 if (shost) {
2564 hba = iscsi_host_priv(shost);
2565 if (!hba) {
2566 pr_info("shost 0x%p, priv NULL.\n", shost);
2567 goto err_out;
2568 }
2569
2570 rtnl_lock();
2571 if (!vlan_uses_dev(hba->ndev))
2572 ifindex = hba->ndev->ifindex;
2573 rtnl_unlock();
2574 }
2575
2576 if (dst_addr->sa_family == AF_INET) {
2577 csk = cxgbi_check_route(dst_addr, ifindex);
2578 #if IS_ENABLED(CONFIG_IPV6)
2579 } else if (dst_addr->sa_family == AF_INET6) {
2580 csk = cxgbi_check_route6(dst_addr, ifindex);
2581 #endif
2582 } else {
2583 pr_info("address family 0x%x NOT supported.\n",
2584 dst_addr->sa_family);
2585 err = -EAFNOSUPPORT;
2586 return (struct iscsi_endpoint *)ERR_PTR(err);
2587 }
2588
2589 if (IS_ERR(csk))
2590 return (struct iscsi_endpoint *)csk;
2591 cxgbi_sock_get(csk);
2592
2593 if (!hba)
2594 hba = csk->cdev->hbas[csk->port_id];
2595 else if (hba != csk->cdev->hbas[csk->port_id]) {
2596 pr_info("Could not connect through requested host %u"
2597 "hba 0x%p != 0x%p (%u).\n",
2598 shost->host_no, hba,
2599 csk->cdev->hbas[csk->port_id], csk->port_id);
2600 err = -ENOSPC;
2601 goto release_conn;
2602 }
2603
2604 err = sock_get_port(csk);
2605 if (err)
2606 goto release_conn;
2607
2608 cxgbi_sock_set_state(csk, CTP_CONNECTING);
2609 err = csk->cdev->csk_init_act_open(csk);
2610 if (err)
2611 goto release_conn;
2612
2613 if (cxgbi_sock_is_closing(csk)) {
2614 err = -ENOSPC;
2615 pr_info("csk 0x%p is closing.\n", csk);
2616 goto release_conn;
2617 }
2618
2619 ep = iscsi_create_endpoint(sizeof(*cep));
2620 if (!ep) {
2621 err = -ENOMEM;
2622 pr_info("iscsi alloc ep, OOM.\n");
2623 goto release_conn;
2624 }
2625
2626 cep = ep->dd_data;
2627 cep->csk = csk;
2628 cep->chba = hba;
2629
2630 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2631 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2632 ep, cep, csk, hba, hba->ndev->name);
2633 return ep;
2634
2635 release_conn:
2636 cxgbi_sock_put(csk);
2637 cxgbi_sock_closed(csk);
2638 err_out:
2639 return ERR_PTR(err);
2640 }
2641 EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2642
2643 int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2644 {
2645 struct cxgbi_endpoint *cep = ep->dd_data;
2646 struct cxgbi_sock *csk = cep->csk;
2647
2648 if (!cxgbi_sock_is_established(csk))
2649 return 0;
2650 return 1;
2651 }
2652 EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2653
2654 void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2655 {
2656 struct cxgbi_endpoint *cep = ep->dd_data;
2657 struct cxgbi_conn *cconn = cep->cconn;
2658 struct cxgbi_sock *csk = cep->csk;
2659
2660 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2661 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2662 ep, cep, cconn, csk, csk->state, csk->flags);
2663
2664 if (cconn && cconn->iconn) {
2665 iscsi_suspend_tx(cconn->iconn);
2666 write_lock_bh(&csk->callback_lock);
2667 cep->csk->user_data = NULL;
2668 cconn->cep = NULL;
2669 write_unlock_bh(&csk->callback_lock);
2670 }
2671 iscsi_destroy_endpoint(ep);
2672
2673 if (likely(csk->state >= CTP_ESTABLISHED))
2674 need_active_close(csk);
2675 else
2676 cxgbi_sock_closed(csk);
2677
2678 cxgbi_sock_put(csk);
2679 }
2680 EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2681
2682 int cxgbi_iscsi_init(struct iscsi_transport *itp,
2683 struct scsi_transport_template **stt)
2684 {
2685 *stt = iscsi_register_transport(itp);
2686 if (*stt == NULL) {
2687 pr_err("unable to register %s transport 0x%p.\n",
2688 itp->name, itp);
2689 return -ENODEV;
2690 }
2691 log_debug(1 << CXGBI_DBG_ISCSI,
2692 "%s, registered iscsi transport 0x%p.\n",
2693 itp->name, stt);
2694 return 0;
2695 }
2696 EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2697
2698 void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2699 struct scsi_transport_template **stt)
2700 {
2701 if (*stt) {
2702 log_debug(1 << CXGBI_DBG_ISCSI,
2703 "de-register transport 0x%p, %s, stt 0x%p.\n",
2704 itp, itp->name, *stt);
2705 *stt = NULL;
2706 iscsi_unregister_transport(itp);
2707 }
2708 }
2709 EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2710
2711 umode_t cxgbi_attr_is_visible(int param_type, int param)
2712 {
2713 switch (param_type) {
2714 case ISCSI_HOST_PARAM:
2715 switch (param) {
2716 case ISCSI_HOST_PARAM_NETDEV_NAME:
2717 case ISCSI_HOST_PARAM_HWADDRESS:
2718 case ISCSI_HOST_PARAM_IPADDRESS:
2719 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2720 return S_IRUGO;
2721 default:
2722 return 0;
2723 }
2724 case ISCSI_PARAM:
2725 switch (param) {
2726 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2727 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2728 case ISCSI_PARAM_HDRDGST_EN:
2729 case ISCSI_PARAM_DATADGST_EN:
2730 case ISCSI_PARAM_CONN_ADDRESS:
2731 case ISCSI_PARAM_CONN_PORT:
2732 case ISCSI_PARAM_EXP_STATSN:
2733 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2734 case ISCSI_PARAM_PERSISTENT_PORT:
2735 case ISCSI_PARAM_PING_TMO:
2736 case ISCSI_PARAM_RECV_TMO:
2737 case ISCSI_PARAM_INITIAL_R2T_EN:
2738 case ISCSI_PARAM_MAX_R2T:
2739 case ISCSI_PARAM_IMM_DATA_EN:
2740 case ISCSI_PARAM_FIRST_BURST:
2741 case ISCSI_PARAM_MAX_BURST:
2742 case ISCSI_PARAM_PDU_INORDER_EN:
2743 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2744 case ISCSI_PARAM_ERL:
2745 case ISCSI_PARAM_TARGET_NAME:
2746 case ISCSI_PARAM_TPGT:
2747 case ISCSI_PARAM_USERNAME:
2748 case ISCSI_PARAM_PASSWORD:
2749 case ISCSI_PARAM_USERNAME_IN:
2750 case ISCSI_PARAM_PASSWORD_IN:
2751 case ISCSI_PARAM_FAST_ABORT:
2752 case ISCSI_PARAM_ABORT_TMO:
2753 case ISCSI_PARAM_LU_RESET_TMO:
2754 case ISCSI_PARAM_TGT_RESET_TMO:
2755 case ISCSI_PARAM_IFACE_NAME:
2756 case ISCSI_PARAM_INITIATOR_NAME:
2757 return S_IRUGO;
2758 default:
2759 return 0;
2760 }
2761 }
2762
2763 return 0;
2764 }
2765 EXPORT_SYMBOL_GPL(cxgbi_attr_is_visible);
2766
2767 static int __init libcxgbi_init_module(void)
2768 {
2769 pr_info("%s", version);
2770
2771 BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, cb) <
2772 sizeof(struct cxgbi_skb_cb));
2773 return 0;
2774 }
2775
2776 static void __exit libcxgbi_exit_module(void)
2777 {
2778 cxgbi_device_unregister_all(0xFF);
2779 return;
2780 }
2781
2782 module_init(libcxgbi_init_module);
2783 module_exit(libcxgbi_exit_module);
Linux with added FPC-III support