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Merge branch 'fixes-for-v3.18' of git://git.linaro.org/people/mszyprowski/linux-dma...
[mirror_ubuntu-bionic-kernel.git] / drivers / scsi / cxgbi / libcxgbi.c
1 /*
2 * libcxgbi.c: Chelsio common library for T3/T4 iSCSI driver.
3 *
4 * Copyright (c) 2010 Chelsio Communications, Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation.
9 *
10 * Written by: Karen Xie (kxie@chelsio.com)
11 * Written by: Rakesh Ranjan (rranjan@chelsio.com)
12 */
13
14 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
15
16 #include <linux/skbuff.h>
17 #include <linux/crypto.h>
18 #include <linux/scatterlist.h>
19 #include <linux/pci.h>
20 #include <scsi/scsi.h>
21 #include <scsi/scsi_cmnd.h>
22 #include <scsi/scsi_host.h>
23 #include <linux/if_vlan.h>
24 #include <linux/inet.h>
25 #include <net/dst.h>
26 #include <net/route.h>
27 #include <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 "0.9.0"
42 #define DRV_MODULE_RELDATE "Jun. 2010"
43
44 MODULE_AUTHOR("Chelsio Communications, Inc.");
45 MODULE_DESCRIPTION(DRV_MODULE_DESC);
46 MODULE_VERSION(DRV_MODULE_VERSION);
47 MODULE_LICENSE("GPL");
48
49 module_param(dbg_level, uint, 0644);
50 MODULE_PARM_DESC(dbg_level, "libiscsi debug level (default=0)");
51
52
53 /*
54 * cxgbi device management
55 * maintains a list of the cxgbi devices
56 */
57 static LIST_HEAD(cdev_list);
58 static DEFINE_MUTEX(cdev_mutex);
59
60 static LIST_HEAD(cdev_rcu_list);
61 static DEFINE_SPINLOCK(cdev_rcu_lock);
62
63 int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
64 unsigned int max_conn)
65 {
66 struct cxgbi_ports_map *pmap = &cdev->pmap;
67
68 pmap->port_csk = cxgbi_alloc_big_mem(max_conn *
69 sizeof(struct cxgbi_sock *),
70 GFP_KERNEL);
71 if (!pmap->port_csk) {
72 pr_warn("cdev 0x%p, portmap OOM %u.\n", cdev, max_conn);
73 return -ENOMEM;
74 }
75
76 pmap->max_connect = max_conn;
77 pmap->sport_base = base;
78 spin_lock_init(&pmap->lock);
79 return 0;
80 }
81 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_create);
82
83 void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev)
84 {
85 struct cxgbi_ports_map *pmap = &cdev->pmap;
86 struct cxgbi_sock *csk;
87 int i;
88
89 for (i = 0; i < pmap->max_connect; i++) {
90 if (pmap->port_csk[i]) {
91 csk = pmap->port_csk[i];
92 pmap->port_csk[i] = NULL;
93 log_debug(1 << CXGBI_DBG_SOCK,
94 "csk 0x%p, cdev 0x%p, offload down.\n",
95 csk, cdev);
96 spin_lock_bh(&csk->lock);
97 cxgbi_sock_set_flag(csk, CTPF_OFFLOAD_DOWN);
98 cxgbi_sock_closed(csk);
99 spin_unlock_bh(&csk->lock);
100 cxgbi_sock_put(csk);
101 }
102 }
103 }
104 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_cleanup);
105
106 static inline void cxgbi_device_destroy(struct cxgbi_device *cdev)
107 {
108 log_debug(1 << CXGBI_DBG_DEV,
109 "cdev 0x%p, p# %u.\n", cdev, cdev->nports);
110 cxgbi_hbas_remove(cdev);
111 cxgbi_device_portmap_cleanup(cdev);
112 if (cdev->dev_ddp_cleanup)
113 cdev->dev_ddp_cleanup(cdev);
114 else
115 cxgbi_ddp_cleanup(cdev);
116 if (cdev->ddp)
117 cxgbi_ddp_cleanup(cdev);
118 if (cdev->pmap.max_connect)
119 cxgbi_free_big_mem(cdev->pmap.port_csk);
120 kfree(cdev);
121 }
122
123 struct cxgbi_device *cxgbi_device_register(unsigned int extra,
124 unsigned int nports)
125 {
126 struct cxgbi_device *cdev;
127
128 cdev = kzalloc(sizeof(*cdev) + extra + nports *
129 (sizeof(struct cxgbi_hba *) +
130 sizeof(struct net_device *)),
131 GFP_KERNEL);
132 if (!cdev) {
133 pr_warn("nport %d, OOM.\n", nports);
134 return NULL;
135 }
136 cdev->ports = (struct net_device **)(cdev + 1);
137 cdev->hbas = (struct cxgbi_hba **)(((char*)cdev->ports) + nports *
138 sizeof(struct net_device *));
139 if (extra)
140 cdev->dd_data = ((char *)cdev->hbas) +
141 nports * sizeof(struct cxgbi_hba *);
142 spin_lock_init(&cdev->pmap.lock);
143
144 mutex_lock(&cdev_mutex);
145 list_add_tail(&cdev->list_head, &cdev_list);
146 mutex_unlock(&cdev_mutex);
147
148 spin_lock(&cdev_rcu_lock);
149 list_add_tail_rcu(&cdev->rcu_node, &cdev_rcu_list);
150 spin_unlock(&cdev_rcu_lock);
151
152 log_debug(1 << CXGBI_DBG_DEV,
153 "cdev 0x%p, p# %u.\n", cdev, nports);
154 return cdev;
155 }
156 EXPORT_SYMBOL_GPL(cxgbi_device_register);
157
158 void cxgbi_device_unregister(struct cxgbi_device *cdev)
159 {
160 log_debug(1 << CXGBI_DBG_DEV,
161 "cdev 0x%p, p# %u,%s.\n",
162 cdev, cdev->nports, cdev->nports ? cdev->ports[0]->name : "");
163
164 mutex_lock(&cdev_mutex);
165 list_del(&cdev->list_head);
166 mutex_unlock(&cdev_mutex);
167
168 spin_lock(&cdev_rcu_lock);
169 list_del_rcu(&cdev->rcu_node);
170 spin_unlock(&cdev_rcu_lock);
171 synchronize_rcu();
172
173 cxgbi_device_destroy(cdev);
174 }
175 EXPORT_SYMBOL_GPL(cxgbi_device_unregister);
176
177 void cxgbi_device_unregister_all(unsigned int flag)
178 {
179 struct cxgbi_device *cdev, *tmp;
180
181 mutex_lock(&cdev_mutex);
182 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
183 if ((cdev->flags & flag) == flag) {
184 mutex_unlock(&cdev_mutex);
185 cxgbi_device_unregister(cdev);
186 mutex_lock(&cdev_mutex);
187 }
188 }
189 mutex_unlock(&cdev_mutex);
190 }
191 EXPORT_SYMBOL_GPL(cxgbi_device_unregister_all);
192
193 struct cxgbi_device *cxgbi_device_find_by_lldev(void *lldev)
194 {
195 struct cxgbi_device *cdev, *tmp;
196
197 mutex_lock(&cdev_mutex);
198 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
199 if (cdev->lldev == lldev) {
200 mutex_unlock(&cdev_mutex);
201 return cdev;
202 }
203 }
204 mutex_unlock(&cdev_mutex);
205
206 log_debug(1 << CXGBI_DBG_DEV,
207 "lldev 0x%p, NO match found.\n", lldev);
208 return NULL;
209 }
210 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev);
211
212 struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev,
213 int *port)
214 {
215 struct net_device *vdev = NULL;
216 struct cxgbi_device *cdev, *tmp;
217 int i;
218
219 if (ndev->priv_flags & IFF_802_1Q_VLAN) {
220 vdev = ndev;
221 ndev = vlan_dev_real_dev(ndev);
222 log_debug(1 << CXGBI_DBG_DEV,
223 "vlan dev %s -> %s.\n", vdev->name, ndev->name);
224 }
225
226 mutex_lock(&cdev_mutex);
227 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
228 for (i = 0; i < cdev->nports; i++) {
229 if (ndev == cdev->ports[i]) {
230 cdev->hbas[i]->vdev = vdev;
231 mutex_unlock(&cdev_mutex);
232 if (port)
233 *port = i;
234 return cdev;
235 }
236 }
237 }
238 mutex_unlock(&cdev_mutex);
239 log_debug(1 << CXGBI_DBG_DEV,
240 "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
241 return NULL;
242 }
243 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev);
244
245 struct cxgbi_device *cxgbi_device_find_by_netdev_rcu(struct net_device *ndev,
246 int *port)
247 {
248 struct net_device *vdev = NULL;
249 struct cxgbi_device *cdev;
250 int i;
251
252 if (ndev->priv_flags & IFF_802_1Q_VLAN) {
253 vdev = ndev;
254 ndev = vlan_dev_real_dev(ndev);
255 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
256 }
257
258 rcu_read_lock();
259 list_for_each_entry_rcu(cdev, &cdev_rcu_list, rcu_node) {
260 for (i = 0; i < cdev->nports; i++) {
261 if (ndev == cdev->ports[i]) {
262 cdev->hbas[i]->vdev = vdev;
263 rcu_read_unlock();
264 if (port)
265 *port = i;
266 return cdev;
267 }
268 }
269 }
270 rcu_read_unlock();
271
272 log_debug(1 << CXGBI_DBG_DEV,
273 "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
274 return NULL;
275 }
276 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev_rcu);
277
278 #if IS_ENABLED(CONFIG_IPV6)
279 static struct cxgbi_device *cxgbi_device_find_by_mac(struct net_device *ndev,
280 int *port)
281 {
282 struct net_device *vdev = NULL;
283 struct cxgbi_device *cdev, *tmp;
284 int i;
285
286 if (ndev->priv_flags & IFF_802_1Q_VLAN) {
287 vdev = ndev;
288 ndev = vlan_dev_real_dev(ndev);
289 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
290 }
291
292 mutex_lock(&cdev_mutex);
293 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
294 for (i = 0; i < cdev->nports; i++) {
295 if (!memcmp(ndev->dev_addr, cdev->ports[i]->dev_addr,
296 MAX_ADDR_LEN)) {
297 cdev->hbas[i]->vdev = vdev;
298 mutex_unlock(&cdev_mutex);
299 if (port)
300 *port = i;
301 return cdev;
302 }
303 }
304 }
305 mutex_unlock(&cdev_mutex);
306 log_debug(1 << CXGBI_DBG_DEV,
307 "ndev 0x%p, %s, NO match mac found.\n",
308 ndev, ndev->name);
309 return NULL;
310 }
311 #endif
312
313 void cxgbi_hbas_remove(struct cxgbi_device *cdev)
314 {
315 int i;
316 struct cxgbi_hba *chba;
317
318 log_debug(1 << CXGBI_DBG_DEV,
319 "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
320
321 for (i = 0; i < cdev->nports; i++) {
322 chba = cdev->hbas[i];
323 if (chba) {
324 cdev->hbas[i] = NULL;
325 iscsi_host_remove(chba->shost);
326 pci_dev_put(cdev->pdev);
327 iscsi_host_free(chba->shost);
328 }
329 }
330 }
331 EXPORT_SYMBOL_GPL(cxgbi_hbas_remove);
332
333 int cxgbi_hbas_add(struct cxgbi_device *cdev, u64 max_lun,
334 unsigned int max_id, struct scsi_host_template *sht,
335 struct scsi_transport_template *stt)
336 {
337 struct cxgbi_hba *chba;
338 struct Scsi_Host *shost;
339 int i, err;
340
341 log_debug(1 << CXGBI_DBG_DEV, "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
342
343 for (i = 0; i < cdev->nports; i++) {
344 shost = iscsi_host_alloc(sht, sizeof(*chba), 1);
345 if (!shost) {
346 pr_info("0x%p, p%d, %s, host alloc failed.\n",
347 cdev, i, cdev->ports[i]->name);
348 err = -ENOMEM;
349 goto err_out;
350 }
351
352 shost->transportt = stt;
353 shost->max_lun = max_lun;
354 shost->max_id = max_id;
355 shost->max_channel = 0;
356 shost->max_cmd_len = 16;
357
358 chba = iscsi_host_priv(shost);
359 chba->cdev = cdev;
360 chba->ndev = cdev->ports[i];
361 chba->shost = shost;
362
363 log_debug(1 << CXGBI_DBG_DEV,
364 "cdev 0x%p, p#%d %s: chba 0x%p.\n",
365 cdev, i, cdev->ports[i]->name, chba);
366
367 pci_dev_get(cdev->pdev);
368 err = iscsi_host_add(shost, &cdev->pdev->dev);
369 if (err) {
370 pr_info("cdev 0x%p, p#%d %s, host add failed.\n",
371 cdev, i, cdev->ports[i]->name);
372 pci_dev_put(cdev->pdev);
373 scsi_host_put(shost);
374 goto err_out;
375 }
376
377 cdev->hbas[i] = chba;
378 }
379
380 return 0;
381
382 err_out:
383 cxgbi_hbas_remove(cdev);
384 return err;
385 }
386 EXPORT_SYMBOL_GPL(cxgbi_hbas_add);
387
388 /*
389 * iSCSI offload
390 *
391 * - source port management
392 * To find a free source port in the port allocation map we use a very simple
393 * rotor scheme to look for the next free port.
394 *
395 * If a source port has been specified make sure that it doesn't collide with
396 * our normal source port allocation map. If it's outside the range of our
397 * allocation/deallocation scheme just let them use it.
398 *
399 * If the source port is outside our allocation range, the caller is
400 * responsible for keeping track of their port usage.
401 */
402
403 static struct cxgbi_sock *find_sock_on_port(struct cxgbi_device *cdev,
404 unsigned char port_id)
405 {
406 struct cxgbi_ports_map *pmap = &cdev->pmap;
407 unsigned int i;
408 unsigned int used;
409
410 if (!pmap->max_connect || !pmap->used)
411 return NULL;
412
413 spin_lock_bh(&pmap->lock);
414 used = pmap->used;
415 for (i = 0; used && i < pmap->max_connect; i++) {
416 struct cxgbi_sock *csk = pmap->port_csk[i];
417
418 if (csk) {
419 if (csk->port_id == port_id) {
420 spin_unlock_bh(&pmap->lock);
421 return csk;
422 }
423 used--;
424 }
425 }
426 spin_unlock_bh(&pmap->lock);
427
428 return NULL;
429 }
430
431 static int sock_get_port(struct cxgbi_sock *csk)
432 {
433 struct cxgbi_device *cdev = csk->cdev;
434 struct cxgbi_ports_map *pmap = &cdev->pmap;
435 unsigned int start;
436 int idx;
437 __be16 *port;
438
439 if (!pmap->max_connect) {
440 pr_err("cdev 0x%p, p#%u %s, NO port map.\n",
441 cdev, csk->port_id, cdev->ports[csk->port_id]->name);
442 return -EADDRNOTAVAIL;
443 }
444
445 if (csk->csk_family == AF_INET)
446 port = &csk->saddr.sin_port;
447 else /* ipv6 */
448 port = &csk->saddr6.sin6_port;
449
450 if (*port) {
451 pr_err("source port NON-ZERO %u.\n",
452 ntohs(*port));
453 return -EADDRINUSE;
454 }
455
456 spin_lock_bh(&pmap->lock);
457 if (pmap->used >= pmap->max_connect) {
458 spin_unlock_bh(&pmap->lock);
459 pr_info("cdev 0x%p, p#%u %s, ALL ports used.\n",
460 cdev, csk->port_id, cdev->ports[csk->port_id]->name);
461 return -EADDRNOTAVAIL;
462 }
463
464 start = idx = pmap->next;
465 do {
466 if (++idx >= pmap->max_connect)
467 idx = 0;
468 if (!pmap->port_csk[idx]) {
469 pmap->used++;
470 *port = htons(pmap->sport_base + idx);
471 pmap->next = idx;
472 pmap->port_csk[idx] = csk;
473 spin_unlock_bh(&pmap->lock);
474 cxgbi_sock_get(csk);
475 log_debug(1 << CXGBI_DBG_SOCK,
476 "cdev 0x%p, p#%u %s, p %u, %u.\n",
477 cdev, csk->port_id,
478 cdev->ports[csk->port_id]->name,
479 pmap->sport_base + idx, pmap->next);
480 return 0;
481 }
482 } while (idx != start);
483 spin_unlock_bh(&pmap->lock);
484
485 /* should not happen */
486 pr_warn("cdev 0x%p, p#%u %s, next %u?\n",
487 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
488 pmap->next);
489 return -EADDRNOTAVAIL;
490 }
491
492 static void sock_put_port(struct cxgbi_sock *csk)
493 {
494 struct cxgbi_device *cdev = csk->cdev;
495 struct cxgbi_ports_map *pmap = &cdev->pmap;
496 __be16 *port;
497
498 if (csk->csk_family == AF_INET)
499 port = &csk->saddr.sin_port;
500 else /* ipv6 */
501 port = &csk->saddr6.sin6_port;
502
503 if (*port) {
504 int idx = ntohs(*port) - pmap->sport_base;
505
506 *port = 0;
507 if (idx < 0 || idx >= pmap->max_connect) {
508 pr_err("cdev 0x%p, p#%u %s, port %u OOR.\n",
509 cdev, csk->port_id,
510 cdev->ports[csk->port_id]->name,
511 ntohs(*port));
512 return;
513 }
514
515 spin_lock_bh(&pmap->lock);
516 pmap->port_csk[idx] = NULL;
517 pmap->used--;
518 spin_unlock_bh(&pmap->lock);
519
520 log_debug(1 << CXGBI_DBG_SOCK,
521 "cdev 0x%p, p#%u %s, release %u.\n",
522 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
523 pmap->sport_base + idx);
524
525 cxgbi_sock_put(csk);
526 }
527 }
528
529 /*
530 * iscsi tcp connection
531 */
532 void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *csk)
533 {
534 if (csk->cpl_close) {
535 kfree_skb(csk->cpl_close);
536 csk->cpl_close = NULL;
537 }
538 if (csk->cpl_abort_req) {
539 kfree_skb(csk->cpl_abort_req);
540 csk->cpl_abort_req = NULL;
541 }
542 if (csk->cpl_abort_rpl) {
543 kfree_skb(csk->cpl_abort_rpl);
544 csk->cpl_abort_rpl = NULL;
545 }
546 }
547 EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs);
548
549 static struct cxgbi_sock *cxgbi_sock_create(struct cxgbi_device *cdev)
550 {
551 struct cxgbi_sock *csk = kzalloc(sizeof(*csk), GFP_NOIO);
552
553 if (!csk) {
554 pr_info("alloc csk %zu failed.\n", sizeof(*csk));
555 return NULL;
556 }
557
558 if (cdev->csk_alloc_cpls(csk) < 0) {
559 pr_info("csk 0x%p, alloc cpls failed.\n", csk);
560 kfree(csk);
561 return NULL;
562 }
563
564 spin_lock_init(&csk->lock);
565 kref_init(&csk->refcnt);
566 skb_queue_head_init(&csk->receive_queue);
567 skb_queue_head_init(&csk->write_queue);
568 setup_timer(&csk->retry_timer, NULL, (unsigned long)csk);
569 rwlock_init(&csk->callback_lock);
570 csk->cdev = cdev;
571 csk->flags = 0;
572 cxgbi_sock_set_state(csk, CTP_CLOSED);
573
574 log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk);
575
576 return csk;
577 }
578
579 static struct rtable *find_route_ipv4(struct flowi4 *fl4,
580 __be32 saddr, __be32 daddr,
581 __be16 sport, __be16 dport, u8 tos)
582 {
583 struct rtable *rt;
584
585 rt = ip_route_output_ports(&init_net, fl4, NULL, daddr, saddr,
586 dport, sport, IPPROTO_TCP, tos, 0);
587 if (IS_ERR(rt))
588 return NULL;
589
590 return rt;
591 }
592
593 static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr)
594 {
595 struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
596 struct dst_entry *dst;
597 struct net_device *ndev;
598 struct cxgbi_device *cdev;
599 struct rtable *rt = NULL;
600 struct neighbour *n;
601 struct flowi4 fl4;
602 struct cxgbi_sock *csk = NULL;
603 unsigned int mtu = 0;
604 int port = 0xFFFF;
605 int err = 0;
606
607 rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0, daddr->sin_port, 0);
608 if (!rt) {
609 pr_info("no route to ipv4 0x%x, port %u.\n",
610 be32_to_cpu(daddr->sin_addr.s_addr),
611 be16_to_cpu(daddr->sin_port));
612 err = -ENETUNREACH;
613 goto err_out;
614 }
615 dst = &rt->dst;
616 n = dst_neigh_lookup(dst, &daddr->sin_addr.s_addr);
617 if (!n) {
618 err = -ENODEV;
619 goto rel_rt;
620 }
621 ndev = n->dev;
622
623 if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
624 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
625 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
626 ndev->name);
627 err = -ENETUNREACH;
628 goto rel_neigh;
629 }
630
631 if (ndev->flags & IFF_LOOPBACK) {
632 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
633 mtu = ndev->mtu;
634 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
635 n->dev->name, ndev->name, mtu);
636 }
637
638 cdev = cxgbi_device_find_by_netdev(ndev, &port);
639 if (!cdev) {
640 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
641 &daddr->sin_addr.s_addr, ndev->name);
642 err = -ENETUNREACH;
643 goto rel_neigh;
644 }
645 log_debug(1 << CXGBI_DBG_SOCK,
646 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
647 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
648 port, ndev->name, cdev);
649
650 csk = cxgbi_sock_create(cdev);
651 if (!csk) {
652 err = -ENOMEM;
653 goto rel_neigh;
654 }
655 csk->cdev = cdev;
656 csk->port_id = port;
657 csk->mtu = mtu;
658 csk->dst = dst;
659
660 csk->csk_family = AF_INET;
661 csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
662 csk->daddr.sin_port = daddr->sin_port;
663 csk->daddr.sin_family = daddr->sin_family;
664 csk->saddr.sin_family = daddr->sin_family;
665 csk->saddr.sin_addr.s_addr = fl4.saddr;
666 neigh_release(n);
667
668 return csk;
669
670 rel_neigh:
671 neigh_release(n);
672
673 rel_rt:
674 ip_rt_put(rt);
675 if (csk)
676 cxgbi_sock_closed(csk);
677 err_out:
678 return ERR_PTR(err);
679 }
680
681 #if IS_ENABLED(CONFIG_IPV6)
682 static struct rt6_info *find_route_ipv6(const struct in6_addr *saddr,
683 const struct in6_addr *daddr)
684 {
685 struct flowi6 fl;
686
687 if (saddr)
688 memcpy(&fl.saddr, saddr, sizeof(struct in6_addr));
689 if (daddr)
690 memcpy(&fl.daddr, daddr, sizeof(struct in6_addr));
691 return (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl);
692 }
693
694 static struct cxgbi_sock *cxgbi_check_route6(struct sockaddr *dst_addr)
695 {
696 struct sockaddr_in6 *daddr6 = (struct sockaddr_in6 *)dst_addr;
697 struct dst_entry *dst;
698 struct net_device *ndev;
699 struct cxgbi_device *cdev;
700 struct rt6_info *rt = NULL;
701 struct neighbour *n;
702 struct in6_addr pref_saddr;
703 struct cxgbi_sock *csk = NULL;
704 unsigned int mtu = 0;
705 int port = 0xFFFF;
706 int err = 0;
707
708 rt = find_route_ipv6(NULL, &daddr6->sin6_addr);
709
710 if (!rt) {
711 pr_info("no route to ipv6 %pI6 port %u\n",
712 daddr6->sin6_addr.s6_addr,
713 be16_to_cpu(daddr6->sin6_port));
714 err = -ENETUNREACH;
715 goto err_out;
716 }
717
718 dst = &rt->dst;
719
720 n = dst_neigh_lookup(dst, &daddr6->sin6_addr);
721
722 if (!n) {
723 pr_info("%pI6, port %u, dst no neighbour.\n",
724 daddr6->sin6_addr.s6_addr,
725 be16_to_cpu(daddr6->sin6_port));
726 err = -ENETUNREACH;
727 goto rel_rt;
728 }
729 ndev = n->dev;
730
731 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
732 pr_info("multi-cast route %pI6 port %u, dev %s.\n",
733 daddr6->sin6_addr.s6_addr,
734 ntohs(daddr6->sin6_port), ndev->name);
735 err = -ENETUNREACH;
736 goto rel_rt;
737 }
738
739 cdev = cxgbi_device_find_by_netdev(ndev, &port);
740 if (!cdev)
741 cdev = cxgbi_device_find_by_mac(ndev, &port);
742 if (!cdev) {
743 pr_info("dst %pI6 %s, NOT cxgbi device.\n",
744 daddr6->sin6_addr.s6_addr, ndev->name);
745 err = -ENETUNREACH;
746 goto rel_rt;
747 }
748 log_debug(1 << CXGBI_DBG_SOCK,
749 "route to %pI6 :%u, ndev p#%d,%s, cdev 0x%p.\n",
750 daddr6->sin6_addr.s6_addr, ntohs(daddr6->sin6_port), port,
751 ndev->name, cdev);
752
753 csk = cxgbi_sock_create(cdev);
754 if (!csk) {
755 err = -ENOMEM;
756 goto rel_rt;
757 }
758 csk->cdev = cdev;
759 csk->port_id = port;
760 csk->mtu = mtu;
761 csk->dst = dst;
762
763 if (ipv6_addr_any(&rt->rt6i_prefsrc.addr)) {
764 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry *)rt);
765
766 err = ipv6_dev_get_saddr(&init_net, idev ? idev->dev : NULL,
767 &daddr6->sin6_addr, 0, &pref_saddr);
768 if (err) {
769 pr_info("failed to get source address to reach %pI6\n",
770 &daddr6->sin6_addr);
771 goto rel_rt;
772 }
773 } else {
774 pref_saddr = rt->rt6i_prefsrc.addr;
775 }
776
777 csk->csk_family = AF_INET6;
778 csk->daddr6.sin6_addr = daddr6->sin6_addr;
779 csk->daddr6.sin6_port = daddr6->sin6_port;
780 csk->daddr6.sin6_family = daddr6->sin6_family;
781 csk->saddr6.sin6_family = daddr6->sin6_family;
782 csk->saddr6.sin6_addr = pref_saddr;
783
784 neigh_release(n);
785 return csk;
786
787 rel_rt:
788 if (n)
789 neigh_release(n);
790
791 ip6_rt_put(rt);
792 if (csk)
793 cxgbi_sock_closed(csk);
794 err_out:
795 return ERR_PTR(err);
796 }
797 #endif /* IS_ENABLED(CONFIG_IPV6) */
798
799 void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
800 unsigned int opt)
801 {
802 csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
803 dst_confirm(csk->dst);
804 smp_mb();
805 cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
806 }
807 EXPORT_SYMBOL_GPL(cxgbi_sock_established);
808
809 static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
810 {
811 log_debug(1 << CXGBI_DBG_SOCK,
812 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
813 csk, csk->state, csk->flags, csk->user_data);
814
815 if (csk->state != CTP_ESTABLISHED) {
816 read_lock_bh(&csk->callback_lock);
817 if (csk->user_data)
818 iscsi_conn_failure(csk->user_data,
819 ISCSI_ERR_CONN_FAILED);
820 read_unlock_bh(&csk->callback_lock);
821 }
822 }
823
824 void cxgbi_sock_closed(struct cxgbi_sock *csk)
825 {
826 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
827 csk, (csk)->state, (csk)->flags, (csk)->tid);
828 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
829 if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
830 return;
831 if (csk->saddr.sin_port)
832 sock_put_port(csk);
833 if (csk->dst)
834 dst_release(csk->dst);
835 csk->cdev->csk_release_offload_resources(csk);
836 cxgbi_sock_set_state(csk, CTP_CLOSED);
837 cxgbi_inform_iscsi_conn_closing(csk);
838 cxgbi_sock_put(csk);
839 }
840 EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
841
842 static void need_active_close(struct cxgbi_sock *csk)
843 {
844 int data_lost;
845 int close_req = 0;
846
847 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
848 csk, (csk)->state, (csk)->flags, (csk)->tid);
849 spin_lock_bh(&csk->lock);
850 dst_confirm(csk->dst);
851 data_lost = skb_queue_len(&csk->receive_queue);
852 __skb_queue_purge(&csk->receive_queue);
853
854 if (csk->state == CTP_ACTIVE_OPEN)
855 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
856 else if (csk->state == CTP_ESTABLISHED) {
857 close_req = 1;
858 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
859 } else if (csk->state == CTP_PASSIVE_CLOSE) {
860 close_req = 1;
861 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
862 }
863
864 if (close_req) {
865 if (data_lost)
866 csk->cdev->csk_send_abort_req(csk);
867 else
868 csk->cdev->csk_send_close_req(csk);
869 }
870
871 spin_unlock_bh(&csk->lock);
872 }
873
874 void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
875 {
876 pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
877 csk, csk->state, csk->flags,
878 &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
879 &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
880 errno);
881
882 cxgbi_sock_set_state(csk, CTP_CONNECTING);
883 csk->err = errno;
884 cxgbi_sock_closed(csk);
885 }
886 EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
887
888 void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
889 {
890 struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
891
892 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
893 csk, (csk)->state, (csk)->flags, (csk)->tid);
894 cxgbi_sock_get(csk);
895 spin_lock_bh(&csk->lock);
896 if (csk->state == CTP_ACTIVE_OPEN)
897 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
898 spin_unlock_bh(&csk->lock);
899 cxgbi_sock_put(csk);
900 __kfree_skb(skb);
901 }
902 EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
903
904 void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
905 {
906 cxgbi_sock_get(csk);
907 spin_lock_bh(&csk->lock);
908 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
909 if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_RCVD))
910 cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
911 else {
912 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_RCVD);
913 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
914 if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
915 pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
916 csk, csk->state, csk->flags, csk->tid);
917 cxgbi_sock_closed(csk);
918 }
919 }
920 spin_unlock_bh(&csk->lock);
921 cxgbi_sock_put(csk);
922 }
923 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
924
925 void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
926 {
927 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
928 csk, (csk)->state, (csk)->flags, (csk)->tid);
929 cxgbi_sock_get(csk);
930 spin_lock_bh(&csk->lock);
931
932 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
933 goto done;
934
935 switch (csk->state) {
936 case CTP_ESTABLISHED:
937 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
938 break;
939 case CTP_ACTIVE_CLOSE:
940 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
941 break;
942 case CTP_CLOSE_WAIT_1:
943 cxgbi_sock_closed(csk);
944 break;
945 case CTP_ABORTING:
946 break;
947 default:
948 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
949 csk, csk->state, csk->flags, csk->tid);
950 }
951 cxgbi_inform_iscsi_conn_closing(csk);
952 done:
953 spin_unlock_bh(&csk->lock);
954 cxgbi_sock_put(csk);
955 }
956 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
957
958 void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
959 {
960 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
961 csk, (csk)->state, (csk)->flags, (csk)->tid);
962 cxgbi_sock_get(csk);
963 spin_lock_bh(&csk->lock);
964
965 csk->snd_una = snd_nxt - 1;
966 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
967 goto done;
968
969 switch (csk->state) {
970 case CTP_ACTIVE_CLOSE:
971 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
972 break;
973 case CTP_CLOSE_WAIT_1:
974 case CTP_CLOSE_WAIT_2:
975 cxgbi_sock_closed(csk);
976 break;
977 case CTP_ABORTING:
978 break;
979 default:
980 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
981 csk, csk->state, csk->flags, csk->tid);
982 }
983 done:
984 spin_unlock_bh(&csk->lock);
985 cxgbi_sock_put(csk);
986 }
987 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
988
989 void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
990 unsigned int snd_una, int seq_chk)
991 {
992 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
993 "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
994 csk, csk->state, csk->flags, csk->tid, credits,
995 csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
996
997 spin_lock_bh(&csk->lock);
998
999 csk->wr_cred += credits;
1000 if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
1001 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
1002
1003 while (credits) {
1004 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
1005
1006 if (unlikely(!p)) {
1007 pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
1008 csk, csk->state, csk->flags, csk->tid, credits,
1009 csk->wr_cred, csk->wr_una_cred);
1010 break;
1011 }
1012
1013 if (unlikely(credits < p->csum)) {
1014 pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
1015 csk, csk->state, csk->flags, csk->tid,
1016 credits, csk->wr_cred, csk->wr_una_cred,
1017 p->csum);
1018 p->csum -= credits;
1019 break;
1020 } else {
1021 cxgbi_sock_dequeue_wr(csk);
1022 credits -= p->csum;
1023 kfree_skb(p);
1024 }
1025 }
1026
1027 cxgbi_sock_check_wr_invariants(csk);
1028
1029 if (seq_chk) {
1030 if (unlikely(before(snd_una, csk->snd_una))) {
1031 pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
1032 csk, csk->state, csk->flags, csk->tid, snd_una,
1033 csk->snd_una);
1034 goto done;
1035 }
1036
1037 if (csk->snd_una != snd_una) {
1038 csk->snd_una = snd_una;
1039 dst_confirm(csk->dst);
1040 }
1041 }
1042
1043 if (skb_queue_len(&csk->write_queue)) {
1044 if (csk->cdev->csk_push_tx_frames(csk, 0))
1045 cxgbi_conn_tx_open(csk);
1046 } else
1047 cxgbi_conn_tx_open(csk);
1048 done:
1049 spin_unlock_bh(&csk->lock);
1050 }
1051 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
1052
1053 static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
1054 unsigned short mtu)
1055 {
1056 int i = 0;
1057
1058 while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
1059 ++i;
1060
1061 return i;
1062 }
1063
1064 unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
1065 {
1066 unsigned int idx;
1067 struct dst_entry *dst = csk->dst;
1068
1069 csk->advmss = dst_metric_advmss(dst);
1070
1071 if (csk->advmss > pmtu - 40)
1072 csk->advmss = pmtu - 40;
1073 if (csk->advmss < csk->cdev->mtus[0] - 40)
1074 csk->advmss = csk->cdev->mtus[0] - 40;
1075 idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
1076
1077 return idx;
1078 }
1079 EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
1080
1081 void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
1082 {
1083 cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
1084 __skb_queue_tail(&csk->write_queue, skb);
1085 }
1086 EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
1087
1088 void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
1089 {
1090 struct sk_buff *skb;
1091
1092 while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
1093 kfree_skb(skb);
1094 }
1095 EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
1096
1097 void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
1098 {
1099 int pending = cxgbi_sock_count_pending_wrs(csk);
1100
1101 if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
1102 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
1103 csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
1104 }
1105 EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
1106
1107 static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
1108 {
1109 struct cxgbi_device *cdev = csk->cdev;
1110 struct sk_buff *next;
1111 int err, copied = 0;
1112
1113 spin_lock_bh(&csk->lock);
1114
1115 if (csk->state != CTP_ESTABLISHED) {
1116 log_debug(1 << CXGBI_DBG_PDU_TX,
1117 "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
1118 csk, csk->state, csk->flags, csk->tid);
1119 err = -EAGAIN;
1120 goto out_err;
1121 }
1122
1123 if (csk->err) {
1124 log_debug(1 << CXGBI_DBG_PDU_TX,
1125 "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
1126 csk, csk->state, csk->flags, csk->tid, csk->err);
1127 err = -EPIPE;
1128 goto out_err;
1129 }
1130
1131 if (csk->write_seq - csk->snd_una >= cdev->snd_win) {
1132 log_debug(1 << CXGBI_DBG_PDU_TX,
1133 "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
1134 csk, csk->state, csk->flags, csk->tid, csk->write_seq,
1135 csk->snd_una, cdev->snd_win);
1136 err = -ENOBUFS;
1137 goto out_err;
1138 }
1139
1140 while (skb) {
1141 int frags = skb_shinfo(skb)->nr_frags +
1142 (skb->len != skb->data_len);
1143
1144 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
1145 pr_err("csk 0x%p, skb head %u < %u.\n",
1146 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
1147 err = -EINVAL;
1148 goto out_err;
1149 }
1150
1151 if (frags >= SKB_WR_LIST_SIZE) {
1152 pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
1153 csk, skb_shinfo(skb)->nr_frags, skb->len,
1154 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
1155 err = -EINVAL;
1156 goto out_err;
1157 }
1158
1159 next = skb->next;
1160 skb->next = NULL;
1161 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
1162 cxgbi_sock_skb_entail(csk, skb);
1163 copied += skb->len;
1164 csk->write_seq += skb->len +
1165 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
1166 skb = next;
1167 }
1168 done:
1169 if (likely(skb_queue_len(&csk->write_queue)))
1170 cdev->csk_push_tx_frames(csk, 1);
1171 spin_unlock_bh(&csk->lock);
1172 return copied;
1173
1174 out_err:
1175 if (copied == 0 && err == -EPIPE)
1176 copied = csk->err ? csk->err : -EPIPE;
1177 else
1178 copied = err;
1179 goto done;
1180 }
1181
1182 /*
1183 * Direct Data Placement -
1184 * Directly place the iSCSI Data-In or Data-Out PDU's payload into pre-posted
1185 * final destination host-memory buffers based on the Initiator Task Tag (ITT)
1186 * in Data-In or Target Task Tag (TTT) in Data-Out PDUs.
1187 * The host memory address is programmed into h/w in the format of pagepod
1188 * entries.
1189 * The location of the pagepod entry is encoded into ddp tag which is used as
1190 * the base for ITT/TTT.
1191 */
1192
1193 static unsigned char ddp_page_order[DDP_PGIDX_MAX] = {0, 1, 2, 4};
1194 static unsigned char ddp_page_shift[DDP_PGIDX_MAX] = {12, 13, 14, 16};
1195 static unsigned char page_idx = DDP_PGIDX_MAX;
1196
1197 static unsigned char sw_tag_idx_bits;
1198 static unsigned char sw_tag_age_bits;
1199
1200 /*
1201 * Direct-Data Placement page size adjustment
1202 */
1203 static int ddp_adjust_page_table(void)
1204 {
1205 int i;
1206 unsigned int base_order, order;
1207
1208 if (PAGE_SIZE < (1UL << ddp_page_shift[0])) {
1209 pr_info("PAGE_SIZE 0x%lx too small, min 0x%lx\n",
1210 PAGE_SIZE, 1UL << ddp_page_shift[0]);
1211 return -EINVAL;
1212 }
1213
1214 base_order = get_order(1UL << ddp_page_shift[0]);
1215 order = get_order(1UL << PAGE_SHIFT);
1216
1217 for (i = 0; i < DDP_PGIDX_MAX; i++) {
1218 /* first is the kernel page size, then just doubling */
1219 ddp_page_order[i] = order - base_order + i;
1220 ddp_page_shift[i] = PAGE_SHIFT + i;
1221 }
1222 return 0;
1223 }
1224
1225 static int ddp_find_page_index(unsigned long pgsz)
1226 {
1227 int i;
1228
1229 for (i = 0; i < DDP_PGIDX_MAX; i++) {
1230 if (pgsz == (1UL << ddp_page_shift[i]))
1231 return i;
1232 }
1233 pr_info("ddp page size %lu not supported.\n", pgsz);
1234 return DDP_PGIDX_MAX;
1235 }
1236
1237 static void ddp_setup_host_page_size(void)
1238 {
1239 if (page_idx == DDP_PGIDX_MAX) {
1240 page_idx = ddp_find_page_index(PAGE_SIZE);
1241
1242 if (page_idx == DDP_PGIDX_MAX) {
1243 pr_info("system PAGE %lu, update hw.\n", PAGE_SIZE);
1244 if (ddp_adjust_page_table() < 0) {
1245 pr_info("PAGE %lu, disable ddp.\n", PAGE_SIZE);
1246 return;
1247 }
1248 page_idx = ddp_find_page_index(PAGE_SIZE);
1249 }
1250 pr_info("system PAGE %lu, ddp idx %u.\n", PAGE_SIZE, page_idx);
1251 }
1252 }
1253
1254 void cxgbi_ddp_page_size_factor(int *pgsz_factor)
1255 {
1256 int i;
1257
1258 for (i = 0; i < DDP_PGIDX_MAX; i++)
1259 pgsz_factor[i] = ddp_page_order[i];
1260 }
1261 EXPORT_SYMBOL_GPL(cxgbi_ddp_page_size_factor);
1262
1263 /*
1264 * DDP setup & teardown
1265 */
1266
1267 void cxgbi_ddp_ppod_set(struct cxgbi_pagepod *ppod,
1268 struct cxgbi_pagepod_hdr *hdr,
1269 struct cxgbi_gather_list *gl, unsigned int gidx)
1270 {
1271 int i;
1272
1273 memcpy(ppod, hdr, sizeof(*hdr));
1274 for (i = 0; i < (PPOD_PAGES_MAX + 1); i++, gidx++) {
1275 ppod->addr[i] = gidx < gl->nelem ?
1276 cpu_to_be64(gl->phys_addr[gidx]) : 0ULL;
1277 }
1278 }
1279 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_set);
1280
1281 void cxgbi_ddp_ppod_clear(struct cxgbi_pagepod *ppod)
1282 {
1283 memset(ppod, 0, sizeof(*ppod));
1284 }
1285 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_clear);
1286
1287 static inline int ddp_find_unused_entries(struct cxgbi_ddp_info *ddp,
1288 unsigned int start, unsigned int max,
1289 unsigned int count,
1290 struct cxgbi_gather_list *gl)
1291 {
1292 unsigned int i, j, k;
1293
1294 /* not enough entries */
1295 if ((max - start) < count) {
1296 log_debug(1 << CXGBI_DBG_DDP,
1297 "NOT enough entries %u+%u < %u.\n", start, count, max);
1298 return -EBUSY;
1299 }
1300
1301 max -= count;
1302 spin_lock(&ddp->map_lock);
1303 for (i = start; i < max;) {
1304 for (j = 0, k = i; j < count; j++, k++) {
1305 if (ddp->gl_map[k])
1306 break;
1307 }
1308 if (j == count) {
1309 for (j = 0, k = i; j < count; j++, k++)
1310 ddp->gl_map[k] = gl;
1311 spin_unlock(&ddp->map_lock);
1312 return i;
1313 }
1314 i += j + 1;
1315 }
1316 spin_unlock(&ddp->map_lock);
1317 log_debug(1 << CXGBI_DBG_DDP,
1318 "NO suitable entries %u available.\n", count);
1319 return -EBUSY;
1320 }
1321
1322 static inline void ddp_unmark_entries(struct cxgbi_ddp_info *ddp,
1323 int start, int count)
1324 {
1325 spin_lock(&ddp->map_lock);
1326 memset(&ddp->gl_map[start], 0,
1327 count * sizeof(struct cxgbi_gather_list *));
1328 spin_unlock(&ddp->map_lock);
1329 }
1330
1331 static inline void ddp_gl_unmap(struct pci_dev *pdev,
1332 struct cxgbi_gather_list *gl)
1333 {
1334 int i;
1335
1336 for (i = 0; i < gl->nelem; i++)
1337 dma_unmap_page(&pdev->dev, gl->phys_addr[i], PAGE_SIZE,
1338 PCI_DMA_FROMDEVICE);
1339 }
1340
1341 static inline int ddp_gl_map(struct pci_dev *pdev,
1342 struct cxgbi_gather_list *gl)
1343 {
1344 int i;
1345
1346 for (i = 0; i < gl->nelem; i++) {
1347 gl->phys_addr[i] = dma_map_page(&pdev->dev, gl->pages[i], 0,
1348 PAGE_SIZE,
1349 PCI_DMA_FROMDEVICE);
1350 if (unlikely(dma_mapping_error(&pdev->dev, gl->phys_addr[i]))) {
1351 log_debug(1 << CXGBI_DBG_DDP,
1352 "page %d 0x%p, 0x%p dma mapping err.\n",
1353 i, gl->pages[i], pdev);
1354 goto unmap;
1355 }
1356 }
1357 return i;
1358 unmap:
1359 if (i) {
1360 unsigned int nelem = gl->nelem;
1361
1362 gl->nelem = i;
1363 ddp_gl_unmap(pdev, gl);
1364 gl->nelem = nelem;
1365 }
1366 return -EINVAL;
1367 }
1368
1369 static void ddp_release_gl(struct cxgbi_gather_list *gl,
1370 struct pci_dev *pdev)
1371 {
1372 ddp_gl_unmap(pdev, gl);
1373 kfree(gl);
1374 }
1375
1376 static struct cxgbi_gather_list *ddp_make_gl(unsigned int xferlen,
1377 struct scatterlist *sgl,
1378 unsigned int sgcnt,
1379 struct pci_dev *pdev,
1380 gfp_t gfp)
1381 {
1382 struct cxgbi_gather_list *gl;
1383 struct scatterlist *sg = sgl;
1384 struct page *sgpage = sg_page(sg);
1385 unsigned int sglen = sg->length;
1386 unsigned int sgoffset = sg->offset;
1387 unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >>
1388 PAGE_SHIFT;
1389 int i = 1, j = 0;
1390
1391 if (xferlen < DDP_THRESHOLD) {
1392 log_debug(1 << CXGBI_DBG_DDP,
1393 "xfer %u < threshold %u, no ddp.\n",
1394 xferlen, DDP_THRESHOLD);
1395 return NULL;
1396 }
1397
1398 gl = kzalloc(sizeof(struct cxgbi_gather_list) +
1399 npages * (sizeof(dma_addr_t) +
1400 sizeof(struct page *)), gfp);
1401 if (!gl) {
1402 log_debug(1 << CXGBI_DBG_DDP,
1403 "xfer %u, %u pages, OOM.\n", xferlen, npages);
1404 return NULL;
1405 }
1406
1407 log_debug(1 << CXGBI_DBG_DDP,
1408 "xfer %u, sgl %u, gl max %u.\n", xferlen, sgcnt, npages);
1409
1410 gl->pages = (struct page **)&gl->phys_addr[npages];
1411 gl->nelem = npages;
1412 gl->length = xferlen;
1413 gl->offset = sgoffset;
1414 gl->pages[0] = sgpage;
1415
1416 for (i = 1, sg = sg_next(sgl), j = 0; i < sgcnt;
1417 i++, sg = sg_next(sg)) {
1418 struct page *page = sg_page(sg);
1419
1420 if (sgpage == page && sg->offset == sgoffset + sglen)
1421 sglen += sg->length;
1422 else {
1423 /* make sure the sgl is fit for ddp:
1424 * each has the same page size, and
1425 * all of the middle pages are used completely
1426 */
1427 if ((j && sgoffset) || ((i != sgcnt - 1) &&
1428 ((sglen + sgoffset) & ~PAGE_MASK))) {
1429 log_debug(1 << CXGBI_DBG_DDP,
1430 "page %d/%u, %u + %u.\n",
1431 i, sgcnt, sgoffset, sglen);
1432 goto error_out;
1433 }
1434
1435 j++;
1436 if (j == gl->nelem || sg->offset) {
1437 log_debug(1 << CXGBI_DBG_DDP,
1438 "page %d/%u, offset %u.\n",
1439 j, gl->nelem, sg->offset);
1440 goto error_out;
1441 }
1442 gl->pages[j] = page;
1443 sglen = sg->length;
1444 sgoffset = sg->offset;
1445 sgpage = page;
1446 }
1447 }
1448 gl->nelem = ++j;
1449
1450 if (ddp_gl_map(pdev, gl) < 0)
1451 goto error_out;
1452
1453 return gl;
1454
1455 error_out:
1456 kfree(gl);
1457 return NULL;
1458 }
1459
1460 static void ddp_tag_release(struct cxgbi_hba *chba, u32 tag)
1461 {
1462 struct cxgbi_device *cdev = chba->cdev;
1463 struct cxgbi_ddp_info *ddp = cdev->ddp;
1464 u32 idx;
1465
1466 idx = (tag >> PPOD_IDX_SHIFT) & ddp->idx_mask;
1467 if (idx < ddp->nppods) {
1468 struct cxgbi_gather_list *gl = ddp->gl_map[idx];
1469 unsigned int npods;
1470
1471 if (!gl || !gl->nelem) {
1472 pr_warn("tag 0x%x, idx %u, gl 0x%p, %u.\n",
1473 tag, idx, gl, gl ? gl->nelem : 0);
1474 return;
1475 }
1476 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1477 log_debug(1 << CXGBI_DBG_DDP,
1478 "tag 0x%x, release idx %u, npods %u.\n",
1479 tag, idx, npods);
1480 cdev->csk_ddp_clear(chba, tag, idx, npods);
1481 ddp_unmark_entries(ddp, idx, npods);
1482 ddp_release_gl(gl, ddp->pdev);
1483 } else
1484 pr_warn("tag 0x%x, idx %u > max %u.\n", tag, idx, ddp->nppods);
1485 }
1486
1487 static int ddp_tag_reserve(struct cxgbi_sock *csk, unsigned int tid,
1488 u32 sw_tag, u32 *tagp, struct cxgbi_gather_list *gl,
1489 gfp_t gfp)
1490 {
1491 struct cxgbi_device *cdev = csk->cdev;
1492 struct cxgbi_ddp_info *ddp = cdev->ddp;
1493 struct cxgbi_tag_format *tformat = &cdev->tag_format;
1494 struct cxgbi_pagepod_hdr hdr;
1495 unsigned int npods;
1496 int idx = -1;
1497 int err = -ENOMEM;
1498 u32 tag;
1499
1500 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1501 if (ddp->idx_last == ddp->nppods)
1502 idx = ddp_find_unused_entries(ddp, 0, ddp->nppods,
1503 npods, gl);
1504 else {
1505 idx = ddp_find_unused_entries(ddp, ddp->idx_last + 1,
1506 ddp->nppods, npods,
1507 gl);
1508 if (idx < 0 && ddp->idx_last >= npods) {
1509 idx = ddp_find_unused_entries(ddp, 0,
1510 min(ddp->idx_last + npods, ddp->nppods),
1511 npods, gl);
1512 }
1513 }
1514 if (idx < 0) {
1515 log_debug(1 << CXGBI_DBG_DDP,
1516 "xferlen %u, gl %u, npods %u NO DDP.\n",
1517 gl->length, gl->nelem, npods);
1518 return idx;
1519 }
1520
1521 tag = cxgbi_ddp_tag_base(tformat, sw_tag);
1522 tag |= idx << PPOD_IDX_SHIFT;
1523
1524 hdr.rsvd = 0;
1525 hdr.vld_tid = htonl(PPOD_VALID_FLAG | PPOD_TID(tid));
1526 hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask);
1527 hdr.max_offset = htonl(gl->length);
1528 hdr.page_offset = htonl(gl->offset);
1529
1530 err = cdev->csk_ddp_set(csk, &hdr, idx, npods, gl);
1531 if (err < 0)
1532 goto unmark_entries;
1533
1534 ddp->idx_last = idx;
1535 log_debug(1 << CXGBI_DBG_DDP,
1536 "xfer %u, gl %u,%u, tid 0x%x, tag 0x%x->0x%x(%u,%u).\n",
1537 gl->length, gl->nelem, gl->offset, tid, sw_tag, tag, idx,
1538 npods);
1539 *tagp = tag;
1540 return 0;
1541
1542 unmark_entries:
1543 ddp_unmark_entries(ddp, idx, npods);
1544 return err;
1545 }
1546
1547 int cxgbi_ddp_reserve(struct cxgbi_sock *csk, unsigned int *tagp,
1548 unsigned int sw_tag, unsigned int xferlen,
1549 struct scatterlist *sgl, unsigned int sgcnt, gfp_t gfp)
1550 {
1551 struct cxgbi_device *cdev = csk->cdev;
1552 struct cxgbi_tag_format *tformat = &cdev->tag_format;
1553 struct cxgbi_gather_list *gl;
1554 int err;
1555
1556 if (page_idx >= DDP_PGIDX_MAX || !cdev->ddp ||
1557 xferlen < DDP_THRESHOLD) {
1558 log_debug(1 << CXGBI_DBG_DDP,
1559 "pgidx %u, xfer %u, NO ddp.\n", page_idx, xferlen);
1560 return -EINVAL;
1561 }
1562
1563 if (!cxgbi_sw_tag_usable(tformat, sw_tag)) {
1564 log_debug(1 << CXGBI_DBG_DDP,
1565 "sw_tag 0x%x NOT usable.\n", sw_tag);
1566 return -EINVAL;
1567 }
1568
1569 gl = ddp_make_gl(xferlen, sgl, sgcnt, cdev->pdev, gfp);
1570 if (!gl)
1571 return -ENOMEM;
1572
1573 err = ddp_tag_reserve(csk, csk->tid, sw_tag, tagp, gl, gfp);
1574 if (err < 0)
1575 ddp_release_gl(gl, cdev->pdev);
1576
1577 return err;
1578 }
1579
1580 static void ddp_destroy(struct kref *kref)
1581 {
1582 struct cxgbi_ddp_info *ddp = container_of(kref,
1583 struct cxgbi_ddp_info,
1584 refcnt);
1585 struct cxgbi_device *cdev = ddp->cdev;
1586 int i = 0;
1587
1588 pr_info("kref 0, destroy ddp 0x%p, cdev 0x%p.\n", ddp, cdev);
1589
1590 while (i < ddp->nppods) {
1591 struct cxgbi_gather_list *gl = ddp->gl_map[i];
1592
1593 if (gl) {
1594 int npods = (gl->nelem + PPOD_PAGES_MAX - 1)
1595 >> PPOD_PAGES_SHIFT;
1596 pr_info("cdev 0x%p, ddp %d + %d.\n", cdev, i, npods);
1597 kfree(gl);
1598 i += npods;
1599 } else
1600 i++;
1601 }
1602 cxgbi_free_big_mem(ddp);
1603 }
1604
1605 int cxgbi_ddp_cleanup(struct cxgbi_device *cdev)
1606 {
1607 struct cxgbi_ddp_info *ddp = cdev->ddp;
1608
1609 log_debug(1 << CXGBI_DBG_DDP,
1610 "cdev 0x%p, release ddp 0x%p.\n", cdev, ddp);
1611 cdev->ddp = NULL;
1612 if (ddp)
1613 return kref_put(&ddp->refcnt, ddp_destroy);
1614 return 0;
1615 }
1616 EXPORT_SYMBOL_GPL(cxgbi_ddp_cleanup);
1617
1618 int cxgbi_ddp_init(struct cxgbi_device *cdev,
1619 unsigned int llimit, unsigned int ulimit,
1620 unsigned int max_txsz, unsigned int max_rxsz)
1621 {
1622 struct cxgbi_ddp_info *ddp;
1623 unsigned int ppmax, bits;
1624
1625 ppmax = (ulimit - llimit + 1) >> PPOD_SIZE_SHIFT;
1626 bits = __ilog2_u32(ppmax) + 1;
1627 if (bits > PPOD_IDX_MAX_SIZE)
1628 bits = PPOD_IDX_MAX_SIZE;
1629 ppmax = (1 << (bits - 1)) - 1;
1630
1631 ddp = cxgbi_alloc_big_mem(sizeof(struct cxgbi_ddp_info) +
1632 ppmax * (sizeof(struct cxgbi_gather_list *) +
1633 sizeof(struct sk_buff *)),
1634 GFP_KERNEL);
1635 if (!ddp) {
1636 pr_warn("cdev 0x%p, ddp ppmax %u OOM.\n", cdev, ppmax);
1637 return -ENOMEM;
1638 }
1639 ddp->gl_map = (struct cxgbi_gather_list **)(ddp + 1);
1640 cdev->ddp = ddp;
1641
1642 spin_lock_init(&ddp->map_lock);
1643 kref_init(&ddp->refcnt);
1644
1645 ddp->cdev = cdev;
1646 ddp->pdev = cdev->pdev;
1647 ddp->llimit = llimit;
1648 ddp->ulimit = ulimit;
1649 ddp->max_txsz = min_t(unsigned int, max_txsz, ULP2_MAX_PKT_SIZE);
1650 ddp->max_rxsz = min_t(unsigned int, max_rxsz, ULP2_MAX_PKT_SIZE);
1651 ddp->nppods = ppmax;
1652 ddp->idx_last = ppmax;
1653 ddp->idx_bits = bits;
1654 ddp->idx_mask = (1 << bits) - 1;
1655 ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1;
1656
1657 cdev->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
1658 cdev->tag_format.rsvd_bits = ddp->idx_bits;
1659 cdev->tag_format.rsvd_shift = PPOD_IDX_SHIFT;
1660 cdev->tag_format.rsvd_mask = (1 << cdev->tag_format.rsvd_bits) - 1;
1661
1662 pr_info("%s tag format, sw %u, rsvd %u,%u, mask 0x%x.\n",
1663 cdev->ports[0]->name, cdev->tag_format.sw_bits,
1664 cdev->tag_format.rsvd_bits, cdev->tag_format.rsvd_shift,
1665 cdev->tag_format.rsvd_mask);
1666
1667 cdev->tx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1668 ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
1669 cdev->rx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1670 ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);
1671
1672 log_debug(1 << CXGBI_DBG_DDP,
1673 "%s max payload size: %u/%u, %u/%u.\n",
1674 cdev->ports[0]->name, cdev->tx_max_size, ddp->max_txsz,
1675 cdev->rx_max_size, ddp->max_rxsz);
1676 return 0;
1677 }
1678 EXPORT_SYMBOL_GPL(cxgbi_ddp_init);
1679
1680 /*
1681 * APIs interacting with open-iscsi libraries
1682 */
1683
1684 static unsigned char padding[4];
1685
1686 static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1687 {
1688 struct scsi_cmnd *sc = task->sc;
1689 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1690 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1691 struct cxgbi_hba *chba = cconn->chba;
1692 struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1693 u32 tag = ntohl((__force u32)hdr_itt);
1694
1695 log_debug(1 << CXGBI_DBG_DDP,
1696 "cdev 0x%p, release tag 0x%x.\n", chba->cdev, tag);
1697 if (sc &&
1698 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
1699 cxgbi_is_ddp_tag(tformat, tag))
1700 ddp_tag_release(chba, tag);
1701 }
1702
1703 static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1704 {
1705 struct scsi_cmnd *sc = task->sc;
1706 struct iscsi_conn *conn = task->conn;
1707 struct iscsi_session *sess = conn->session;
1708 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1709 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1710 struct cxgbi_hba *chba = cconn->chba;
1711 struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1712 u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
1713 u32 tag = 0;
1714 int err = -EINVAL;
1715
1716 if (sc &&
1717 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)) {
1718 err = cxgbi_ddp_reserve(cconn->cep->csk, &tag, sw_tag,
1719 scsi_in(sc)->length,
1720 scsi_in(sc)->table.sgl,
1721 scsi_in(sc)->table.nents,
1722 GFP_ATOMIC);
1723 if (err < 0)
1724 log_debug(1 << CXGBI_DBG_DDP,
1725 "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1726 cconn->cep->csk, task, scsi_in(sc)->length,
1727 scsi_in(sc)->table.nents);
1728 }
1729
1730 if (err < 0)
1731 tag = cxgbi_set_non_ddp_tag(tformat, sw_tag);
1732 /* the itt need to sent in big-endian order */
1733 *hdr_itt = (__force itt_t)htonl(tag);
1734
1735 log_debug(1 << CXGBI_DBG_DDP,
1736 "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1737 chba->cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1738 return 0;
1739 }
1740
1741 void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1742 {
1743 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1744 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1745 struct cxgbi_device *cdev = cconn->chba->cdev;
1746 u32 tag = ntohl((__force u32) itt);
1747 u32 sw_bits;
1748
1749 sw_bits = cxgbi_tag_nonrsvd_bits(&cdev->tag_format, tag);
1750 if (idx)
1751 *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
1752 if (age)
1753 *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
1754
1755 log_debug(1 << CXGBI_DBG_DDP,
1756 "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1757 cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1758 age ? *age : 0xFF);
1759 }
1760 EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1761
1762 void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1763 {
1764 struct iscsi_conn *conn = csk->user_data;
1765
1766 if (conn) {
1767 log_debug(1 << CXGBI_DBG_SOCK,
1768 "csk 0x%p, cid %d.\n", csk, conn->id);
1769 iscsi_conn_queue_work(conn);
1770 }
1771 }
1772 EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1773
1774 /*
1775 * pdu receive, interact with libiscsi_tcp
1776 */
1777 static inline int read_pdu_skb(struct iscsi_conn *conn,
1778 struct sk_buff *skb,
1779 unsigned int offset,
1780 int offloaded)
1781 {
1782 int status = 0;
1783 int bytes_read;
1784
1785 bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1786 switch (status) {
1787 case ISCSI_TCP_CONN_ERR:
1788 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1789 skb, offset, offloaded);
1790 return -EIO;
1791 case ISCSI_TCP_SUSPENDED:
1792 log_debug(1 << CXGBI_DBG_PDU_RX,
1793 "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1794 skb, offset, offloaded, bytes_read);
1795 /* no transfer - just have caller flush queue */
1796 return bytes_read;
1797 case ISCSI_TCP_SKB_DONE:
1798 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1799 skb, offset, offloaded);
1800 /*
1801 * pdus should always fit in the skb and we should get
1802 * segment done notifcation.
1803 */
1804 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1805 return -EFAULT;
1806 case ISCSI_TCP_SEGMENT_DONE:
1807 log_debug(1 << CXGBI_DBG_PDU_RX,
1808 "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1809 skb, offset, offloaded, bytes_read);
1810 return bytes_read;
1811 default:
1812 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1813 skb, offset, offloaded, status);
1814 return -EINVAL;
1815 }
1816 }
1817
1818 static int skb_read_pdu_bhs(struct iscsi_conn *conn, struct sk_buff *skb)
1819 {
1820 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1821
1822 log_debug(1 << CXGBI_DBG_PDU_RX,
1823 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1824 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1825
1826 if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1827 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1828 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1829 return -EIO;
1830 }
1831
1832 if (conn->hdrdgst_en &&
1833 cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1834 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1835 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1836 return -EIO;
1837 }
1838
1839 return read_pdu_skb(conn, skb, 0, 0);
1840 }
1841
1842 static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1843 struct sk_buff *skb, unsigned int offset)
1844 {
1845 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1846 bool offloaded = 0;
1847 int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1848
1849 log_debug(1 << CXGBI_DBG_PDU_RX,
1850 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1851 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1852
1853 if (conn->datadgst_en &&
1854 cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1855 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1856 conn, lskb, cxgbi_skcb_flags(lskb));
1857 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1858 return -EIO;
1859 }
1860
1861 if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1862 return 0;
1863
1864 /* coalesced, add header digest length */
1865 if (lskb == skb && conn->hdrdgst_en)
1866 offset += ISCSI_DIGEST_SIZE;
1867
1868 if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1869 offloaded = 1;
1870
1871 if (opcode == ISCSI_OP_SCSI_DATA_IN)
1872 log_debug(1 << CXGBI_DBG_PDU_RX,
1873 "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1874 skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1875 tcp_conn->in.datalen, offloaded ? "is" : "not");
1876
1877 return read_pdu_skb(conn, skb, offset, offloaded);
1878 }
1879
1880 static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1881 {
1882 struct cxgbi_device *cdev = csk->cdev;
1883 int must_send;
1884 u32 credits;
1885
1886 log_debug(1 << CXGBI_DBG_PDU_RX,
1887 "csk 0x%p,%u,0x%lx,%u, seq %u, wup %u, thre %u, %u.\n",
1888 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1889 csk->rcv_wup, cdev->rx_credit_thres,
1890 cdev->rcv_win);
1891
1892 if (csk->state != CTP_ESTABLISHED)
1893 return;
1894
1895 credits = csk->copied_seq - csk->rcv_wup;
1896 if (unlikely(!credits))
1897 return;
1898 if (unlikely(cdev->rx_credit_thres == 0))
1899 return;
1900
1901 must_send = credits + 16384 >= cdev->rcv_win;
1902 if (must_send || credits >= cdev->rx_credit_thres)
1903 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1904 }
1905
1906 void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1907 {
1908 struct cxgbi_device *cdev = csk->cdev;
1909 struct iscsi_conn *conn = csk->user_data;
1910 struct sk_buff *skb;
1911 unsigned int read = 0;
1912 int err = 0;
1913
1914 log_debug(1 << CXGBI_DBG_PDU_RX,
1915 "csk 0x%p, conn 0x%p.\n", csk, conn);
1916
1917 if (unlikely(!conn || conn->suspend_rx)) {
1918 log_debug(1 << CXGBI_DBG_PDU_RX,
1919 "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1920 csk, conn, conn ? conn->id : 0xFF,
1921 conn ? conn->suspend_rx : 0xFF);
1922 return;
1923 }
1924
1925 while (!err) {
1926 skb = skb_peek(&csk->receive_queue);
1927 if (!skb ||
1928 !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1929 if (skb)
1930 log_debug(1 << CXGBI_DBG_PDU_RX,
1931 "skb 0x%p, NOT ready 0x%lx.\n",
1932 skb, cxgbi_skcb_flags(skb));
1933 break;
1934 }
1935 __skb_unlink(skb, &csk->receive_queue);
1936
1937 read += cxgbi_skcb_rx_pdulen(skb);
1938 log_debug(1 << CXGBI_DBG_PDU_RX,
1939 "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1940 csk, skb, skb->len, cxgbi_skcb_flags(skb),
1941 cxgbi_skcb_rx_pdulen(skb));
1942
1943 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1944 err = skb_read_pdu_bhs(conn, skb);
1945 if (err < 0) {
1946 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1947 "f 0x%lx, plen %u.\n",
1948 csk, skb, skb->len,
1949 cxgbi_skcb_flags(skb),
1950 cxgbi_skcb_rx_pdulen(skb));
1951 goto skb_done;
1952 }
1953 err = skb_read_pdu_data(conn, skb, skb,
1954 err + cdev->skb_rx_extra);
1955 if (err < 0)
1956 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1957 "f 0x%lx, plen %u.\n",
1958 csk, skb, skb->len,
1959 cxgbi_skcb_flags(skb),
1960 cxgbi_skcb_rx_pdulen(skb));
1961 } else {
1962 err = skb_read_pdu_bhs(conn, skb);
1963 if (err < 0) {
1964 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1965 "f 0x%lx, plen %u.\n",
1966 csk, skb, skb->len,
1967 cxgbi_skcb_flags(skb),
1968 cxgbi_skcb_rx_pdulen(skb));
1969 goto skb_done;
1970 }
1971
1972 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1973 struct sk_buff *dskb;
1974
1975 dskb = skb_peek(&csk->receive_queue);
1976 if (!dskb) {
1977 pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1978 " plen %u, NO data.\n",
1979 csk, skb, skb->len,
1980 cxgbi_skcb_flags(skb),
1981 cxgbi_skcb_rx_pdulen(skb));
1982 err = -EIO;
1983 goto skb_done;
1984 }
1985 __skb_unlink(dskb, &csk->receive_queue);
1986
1987 err = skb_read_pdu_data(conn, skb, dskb, 0);
1988 if (err < 0)
1989 pr_err("data, csk 0x%p, skb 0x%p,%u, "
1990 "f 0x%lx, plen %u, dskb 0x%p,"
1991 "%u.\n",
1992 csk, skb, skb->len,
1993 cxgbi_skcb_flags(skb),
1994 cxgbi_skcb_rx_pdulen(skb),
1995 dskb, dskb->len);
1996 __kfree_skb(dskb);
1997 } else
1998 err = skb_read_pdu_data(conn, skb, skb, 0);
1999 }
2000 skb_done:
2001 __kfree_skb(skb);
2002
2003 if (err < 0)
2004 break;
2005 }
2006
2007 log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
2008 if (read) {
2009 csk->copied_seq += read;
2010 csk_return_rx_credits(csk, read);
2011 conn->rxdata_octets += read;
2012 }
2013
2014 if (err < 0) {
2015 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
2016 csk, conn, err, read);
2017 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
2018 }
2019 }
2020 EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
2021
2022 static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
2023 unsigned int offset, unsigned int *off,
2024 struct scatterlist **sgp)
2025 {
2026 int i;
2027 struct scatterlist *sg;
2028
2029 for_each_sg(sgl, sg, sgcnt, i) {
2030 if (offset < sg->length) {
2031 *off = offset;
2032 *sgp = sg;
2033 return 0;
2034 }
2035 offset -= sg->length;
2036 }
2037 return -EFAULT;
2038 }
2039
2040 static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
2041 unsigned int dlen, struct page_frag *frags,
2042 int frag_max)
2043 {
2044 unsigned int datalen = dlen;
2045 unsigned int sglen = sg->length - sgoffset;
2046 struct page *page = sg_page(sg);
2047 int i;
2048
2049 i = 0;
2050 do {
2051 unsigned int copy;
2052
2053 if (!sglen) {
2054 sg = sg_next(sg);
2055 if (!sg) {
2056 pr_warn("sg %d NULL, len %u/%u.\n",
2057 i, datalen, dlen);
2058 return -EINVAL;
2059 }
2060 sgoffset = 0;
2061 sglen = sg->length;
2062 page = sg_page(sg);
2063
2064 }
2065 copy = min(datalen, sglen);
2066 if (i && page == frags[i - 1].page &&
2067 sgoffset + sg->offset ==
2068 frags[i - 1].offset + frags[i - 1].size) {
2069 frags[i - 1].size += copy;
2070 } else {
2071 if (i >= frag_max) {
2072 pr_warn("too many pages %u, dlen %u.\n",
2073 frag_max, dlen);
2074 return -EINVAL;
2075 }
2076
2077 frags[i].page = page;
2078 frags[i].offset = sg->offset + sgoffset;
2079 frags[i].size = copy;
2080 i++;
2081 }
2082 datalen -= copy;
2083 sgoffset += copy;
2084 sglen -= copy;
2085 } while (datalen);
2086
2087 return i;
2088 }
2089
2090 int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
2091 {
2092 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2093 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2094 struct cxgbi_device *cdev = cconn->chba->cdev;
2095 struct iscsi_conn *conn = task->conn;
2096 struct iscsi_tcp_task *tcp_task = task->dd_data;
2097 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2098 struct scsi_cmnd *sc = task->sc;
2099 int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
2100
2101 tcp_task->dd_data = tdata;
2102 task->hdr = NULL;
2103
2104 if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
2105 (opcode == ISCSI_OP_SCSI_DATA_OUT ||
2106 (opcode == ISCSI_OP_SCSI_CMD &&
2107 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
2108 /* data could goes into skb head */
2109 headroom += min_t(unsigned int,
2110 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
2111 conn->max_xmit_dlength);
2112
2113 tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
2114 if (!tdata->skb) {
2115 struct cxgbi_sock *csk = cconn->cep->csk;
2116 struct net_device *ndev = cdev->ports[csk->port_id];
2117 ndev->stats.tx_dropped++;
2118 return -ENOMEM;
2119 }
2120
2121 skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
2122 task->hdr = (struct iscsi_hdr *)tdata->skb->data;
2123 task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
2124
2125 /* data_out uses scsi_cmd's itt */
2126 if (opcode != ISCSI_OP_SCSI_DATA_OUT)
2127 task_reserve_itt(task, &task->hdr->itt);
2128
2129 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2130 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
2131 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
2132 conn->max_xmit_dlength, ntohl(task->hdr->itt));
2133
2134 return 0;
2135 }
2136 EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
2137
2138 static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
2139 {
2140 if (hcrc || dcrc) {
2141 u8 submode = 0;
2142
2143 if (hcrc)
2144 submode |= 1;
2145 if (dcrc)
2146 submode |= 2;
2147 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
2148 } else
2149 cxgbi_skcb_ulp_mode(skb) = 0;
2150 }
2151
2152 int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
2153 unsigned int count)
2154 {
2155 struct iscsi_conn *conn = task->conn;
2156 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2157 struct sk_buff *skb = tdata->skb;
2158 unsigned int datalen = count;
2159 int i, padlen = iscsi_padding(count);
2160 struct page *pg;
2161
2162 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2163 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
2164 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
2165 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
2166
2167 skb_put(skb, task->hdr_len);
2168 tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
2169 if (!count)
2170 return 0;
2171
2172 if (task->sc) {
2173 struct scsi_data_buffer *sdb = scsi_out(task->sc);
2174 struct scatterlist *sg = NULL;
2175 int err;
2176
2177 tdata->offset = offset;
2178 tdata->count = count;
2179 err = sgl_seek_offset(
2180 sdb->table.sgl, sdb->table.nents,
2181 tdata->offset, &tdata->sgoffset, &sg);
2182 if (err < 0) {
2183 pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
2184 sdb->table.nents, tdata->offset, sdb->length);
2185 return err;
2186 }
2187 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
2188 tdata->frags, MAX_PDU_FRAGS);
2189 if (err < 0) {
2190 pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
2191 sdb->table.nents, tdata->offset, tdata->count);
2192 return err;
2193 }
2194 tdata->nr_frags = err;
2195
2196 if (tdata->nr_frags > MAX_SKB_FRAGS ||
2197 (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
2198 char *dst = skb->data + task->hdr_len;
2199 struct page_frag *frag = tdata->frags;
2200
2201 /* data fits in the skb's headroom */
2202 for (i = 0; i < tdata->nr_frags; i++, frag++) {
2203 char *src = kmap_atomic(frag->page);
2204
2205 memcpy(dst, src+frag->offset, frag->size);
2206 dst += frag->size;
2207 kunmap_atomic(src);
2208 }
2209 if (padlen) {
2210 memset(dst, 0, padlen);
2211 padlen = 0;
2212 }
2213 skb_put(skb, count + padlen);
2214 } else {
2215 /* data fit into frag_list */
2216 for (i = 0; i < tdata->nr_frags; i++) {
2217 __skb_fill_page_desc(skb, i,
2218 tdata->frags[i].page,
2219 tdata->frags[i].offset,
2220 tdata->frags[i].size);
2221 skb_frag_ref(skb, i);
2222 }
2223 skb_shinfo(skb)->nr_frags = tdata->nr_frags;
2224 skb->len += count;
2225 skb->data_len += count;
2226 skb->truesize += count;
2227 }
2228
2229 } else {
2230 pg = virt_to_page(task->data);
2231
2232 get_page(pg);
2233 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
2234 count);
2235 skb->len += count;
2236 skb->data_len += count;
2237 skb->truesize += count;
2238 }
2239
2240 if (padlen) {
2241 i = skb_shinfo(skb)->nr_frags;
2242 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
2243 virt_to_page(padding), offset_in_page(padding),
2244 padlen);
2245
2246 skb->data_len += padlen;
2247 skb->truesize += padlen;
2248 skb->len += padlen;
2249 }
2250
2251 return 0;
2252 }
2253 EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
2254
2255 int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2256 {
2257 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2258 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2259 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2260 struct sk_buff *skb = tdata->skb;
2261 unsigned int datalen;
2262 int err;
2263
2264 if (!skb) {
2265 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2266 "task 0x%p, skb NULL.\n", task);
2267 return 0;
2268 }
2269
2270 datalen = skb->data_len;
2271 tdata->skb = NULL;
2272 err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2273 if (err > 0) {
2274 int pdulen = err;
2275
2276 log_debug(1 << CXGBI_DBG_PDU_TX,
2277 "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2278 task, task->sc, skb, skb->len, skb->data_len, err);
2279
2280 if (task->conn->hdrdgst_en)
2281 pdulen += ISCSI_DIGEST_SIZE;
2282
2283 if (datalen && task->conn->datadgst_en)
2284 pdulen += ISCSI_DIGEST_SIZE;
2285
2286 task->conn->txdata_octets += pdulen;
2287 return 0;
2288 }
2289
2290 if (err == -EAGAIN || err == -ENOBUFS) {
2291 log_debug(1 << CXGBI_DBG_PDU_TX,
2292 "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2293 task, skb, skb->len, skb->data_len, err);
2294 /* reset skb to send when we are called again */
2295 tdata->skb = skb;
2296 return err;
2297 }
2298
2299 kfree_skb(skb);
2300 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2301 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2302 task->itt, skb, skb->len, skb->data_len, err);
2303 iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2304 iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2305 return err;
2306 }
2307 EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2308
2309 void cxgbi_cleanup_task(struct iscsi_task *task)
2310 {
2311 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2312
2313 log_debug(1 << CXGBI_DBG_ISCSI,
2314 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2315 task, tdata->skb, task->hdr_itt);
2316
2317 /* never reached the xmit task callout */
2318 if (tdata->skb)
2319 __kfree_skb(tdata->skb);
2320 memset(tdata, 0, sizeof(*tdata));
2321
2322 task_release_itt(task, task->hdr_itt);
2323 iscsi_tcp_cleanup_task(task);
2324 }
2325 EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2326
2327 void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2328 struct iscsi_stats *stats)
2329 {
2330 struct iscsi_conn *conn = cls_conn->dd_data;
2331
2332 stats->txdata_octets = conn->txdata_octets;
2333 stats->rxdata_octets = conn->rxdata_octets;
2334 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2335 stats->dataout_pdus = conn->dataout_pdus_cnt;
2336 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2337 stats->datain_pdus = conn->datain_pdus_cnt;
2338 stats->r2t_pdus = conn->r2t_pdus_cnt;
2339 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2340 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2341 stats->digest_err = 0;
2342 stats->timeout_err = 0;
2343 stats->custom_length = 1;
2344 strcpy(stats->custom[0].desc, "eh_abort_cnt");
2345 stats->custom[0].value = conn->eh_abort_cnt;
2346 }
2347 EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2348
2349 static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2350 {
2351 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2352 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2353 struct cxgbi_device *cdev = cconn->chba->cdev;
2354 unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2355 unsigned int max_def = 512 * MAX_SKB_FRAGS;
2356 unsigned int max = max(max_def, headroom);
2357
2358 max = min(cconn->chba->cdev->tx_max_size, max);
2359 if (conn->max_xmit_dlength)
2360 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2361 else
2362 conn->max_xmit_dlength = max;
2363 cxgbi_align_pdu_size(conn->max_xmit_dlength);
2364
2365 return 0;
2366 }
2367
2368 static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2369 {
2370 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2371 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2372 unsigned int max = cconn->chba->cdev->rx_max_size;
2373
2374 cxgbi_align_pdu_size(max);
2375
2376 if (conn->max_recv_dlength) {
2377 if (conn->max_recv_dlength > max) {
2378 pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2379 conn->max_recv_dlength, max);
2380 return -EINVAL;
2381 }
2382 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2383 cxgbi_align_pdu_size(conn->max_recv_dlength);
2384 } else
2385 conn->max_recv_dlength = max;
2386
2387 return 0;
2388 }
2389
2390 int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2391 enum iscsi_param param, char *buf, int buflen)
2392 {
2393 struct iscsi_conn *conn = cls_conn->dd_data;
2394 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2395 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2396 struct cxgbi_sock *csk = cconn->cep->csk;
2397 int err;
2398
2399 log_debug(1 << CXGBI_DBG_ISCSI,
2400 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2401 cls_conn, param, buflen, buf);
2402
2403 switch (param) {
2404 case ISCSI_PARAM_HDRDGST_EN:
2405 err = iscsi_set_param(cls_conn, param, buf, buflen);
2406 if (!err && conn->hdrdgst_en)
2407 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2408 conn->hdrdgst_en,
2409 conn->datadgst_en, 0);
2410 break;
2411 case ISCSI_PARAM_DATADGST_EN:
2412 err = iscsi_set_param(cls_conn, param, buf, buflen);
2413 if (!err && conn->datadgst_en)
2414 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2415 conn->hdrdgst_en,
2416 conn->datadgst_en, 0);
2417 break;
2418 case ISCSI_PARAM_MAX_R2T:
2419 return iscsi_tcp_set_max_r2t(conn, buf);
2420 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2421 err = iscsi_set_param(cls_conn, param, buf, buflen);
2422 if (!err)
2423 err = cxgbi_conn_max_recv_dlength(conn);
2424 break;
2425 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2426 err = iscsi_set_param(cls_conn, param, buf, buflen);
2427 if (!err)
2428 err = cxgbi_conn_max_xmit_dlength(conn);
2429 break;
2430 default:
2431 return iscsi_set_param(cls_conn, param, buf, buflen);
2432 }
2433 return err;
2434 }
2435 EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2436
2437 static inline int csk_print_port(struct cxgbi_sock *csk, char *buf)
2438 {
2439 int len;
2440
2441 cxgbi_sock_get(csk);
2442 len = sprintf(buf, "%hu\n", ntohs(csk->daddr.sin_port));
2443 cxgbi_sock_put(csk);
2444
2445 return len;
2446 }
2447
2448 static inline int csk_print_ip(struct cxgbi_sock *csk, char *buf)
2449 {
2450 int len;
2451
2452 cxgbi_sock_get(csk);
2453 if (csk->csk_family == AF_INET)
2454 len = sprintf(buf, "%pI4",
2455 &csk->daddr.sin_addr.s_addr);
2456 else
2457 len = sprintf(buf, "%pI6",
2458 &csk->daddr6.sin6_addr);
2459
2460 cxgbi_sock_put(csk);
2461
2462 return len;
2463 }
2464
2465 int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2466 char *buf)
2467 {
2468 struct cxgbi_endpoint *cep = ep->dd_data;
2469 struct cxgbi_sock *csk;
2470 int len;
2471
2472 log_debug(1 << CXGBI_DBG_ISCSI,
2473 "cls_conn 0x%p, param %d.\n", ep, param);
2474
2475 switch (param) {
2476 case ISCSI_PARAM_CONN_PORT:
2477 case ISCSI_PARAM_CONN_ADDRESS:
2478 if (!cep)
2479 return -ENOTCONN;
2480
2481 csk = cep->csk;
2482 if (!csk)
2483 return -ENOTCONN;
2484
2485 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2486 &csk->daddr, param, buf);
2487 default:
2488 return -ENOSYS;
2489 }
2490 return len;
2491 }
2492 EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
2493
2494 struct iscsi_cls_conn *
2495 cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2496 {
2497 struct iscsi_cls_conn *cls_conn;
2498 struct iscsi_conn *conn;
2499 struct iscsi_tcp_conn *tcp_conn;
2500 struct cxgbi_conn *cconn;
2501
2502 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2503 if (!cls_conn)
2504 return NULL;
2505
2506 conn = cls_conn->dd_data;
2507 tcp_conn = conn->dd_data;
2508 cconn = tcp_conn->dd_data;
2509 cconn->iconn = conn;
2510
2511 log_debug(1 << CXGBI_DBG_ISCSI,
2512 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2513 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2514
2515 return cls_conn;
2516 }
2517 EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2518
2519 int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2520 struct iscsi_cls_conn *cls_conn,
2521 u64 transport_eph, int is_leading)
2522 {
2523 struct iscsi_conn *conn = cls_conn->dd_data;
2524 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2525 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2526 struct iscsi_endpoint *ep;
2527 struct cxgbi_endpoint *cep;
2528 struct cxgbi_sock *csk;
2529 int err;
2530
2531 ep = iscsi_lookup_endpoint(transport_eph);
2532 if (!ep)
2533 return -EINVAL;
2534
2535 /* setup ddp pagesize */
2536 cep = ep->dd_data;
2537 csk = cep->csk;
2538 err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid, page_idx, 0);
2539 if (err < 0)
2540 return err;
2541
2542 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2543 if (err)
2544 return -EINVAL;
2545
2546 /* calculate the tag idx bits needed for this conn based on cmds_max */
2547 cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2548
2549 write_lock_bh(&csk->callback_lock);
2550 csk->user_data = conn;
2551 cconn->chba = cep->chba;
2552 cconn->cep = cep;
2553 cep->cconn = cconn;
2554 write_unlock_bh(&csk->callback_lock);
2555
2556 cxgbi_conn_max_xmit_dlength(conn);
2557 cxgbi_conn_max_recv_dlength(conn);
2558
2559 log_debug(1 << CXGBI_DBG_ISCSI,
2560 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2561 cls_session, cls_conn, ep, cconn, csk);
2562 /* init recv engine */
2563 iscsi_tcp_hdr_recv_prep(tcp_conn);
2564
2565 return 0;
2566 }
2567 EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2568
2569 struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2570 u16 cmds_max, u16 qdepth,
2571 u32 initial_cmdsn)
2572 {
2573 struct cxgbi_endpoint *cep;
2574 struct cxgbi_hba *chba;
2575 struct Scsi_Host *shost;
2576 struct iscsi_cls_session *cls_session;
2577 struct iscsi_session *session;
2578
2579 if (!ep) {
2580 pr_err("missing endpoint.\n");
2581 return NULL;
2582 }
2583
2584 cep = ep->dd_data;
2585 chba = cep->chba;
2586 shost = chba->shost;
2587
2588 BUG_ON(chba != iscsi_host_priv(shost));
2589
2590 cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2591 cmds_max, 0,
2592 sizeof(struct iscsi_tcp_task) +
2593 sizeof(struct cxgbi_task_data),
2594 initial_cmdsn, ISCSI_MAX_TARGET);
2595 if (!cls_session)
2596 return NULL;
2597
2598 session = cls_session->dd_data;
2599 if (iscsi_tcp_r2tpool_alloc(session))
2600 goto remove_session;
2601
2602 log_debug(1 << CXGBI_DBG_ISCSI,
2603 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2604 return cls_session;
2605
2606 remove_session:
2607 iscsi_session_teardown(cls_session);
2608 return NULL;
2609 }
2610 EXPORT_SYMBOL_GPL(cxgbi_create_session);
2611
2612 void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2613 {
2614 log_debug(1 << CXGBI_DBG_ISCSI,
2615 "cls sess 0x%p.\n", cls_session);
2616
2617 iscsi_tcp_r2tpool_free(cls_session->dd_data);
2618 iscsi_session_teardown(cls_session);
2619 }
2620 EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2621
2622 int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2623 char *buf, int buflen)
2624 {
2625 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2626
2627 if (!chba->ndev) {
2628 shost_printk(KERN_ERR, shost, "Could not get host param. "
2629 "netdev for host not set.\n");
2630 return -ENODEV;
2631 }
2632
2633 log_debug(1 << CXGBI_DBG_ISCSI,
2634 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2635 shost, chba, chba->ndev->name, param, buflen, buf);
2636
2637 switch (param) {
2638 case ISCSI_HOST_PARAM_IPADDRESS:
2639 {
2640 __be32 addr = in_aton(buf);
2641 log_debug(1 << CXGBI_DBG_ISCSI,
2642 "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2643 cxgbi_set_iscsi_ipv4(chba, addr);
2644 return 0;
2645 }
2646 case ISCSI_HOST_PARAM_HWADDRESS:
2647 case ISCSI_HOST_PARAM_NETDEV_NAME:
2648 return 0;
2649 default:
2650 return iscsi_host_set_param(shost, param, buf, buflen);
2651 }
2652 }
2653 EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2654
2655 int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2656 char *buf)
2657 {
2658 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2659 int len = 0;
2660
2661 if (!chba->ndev) {
2662 shost_printk(KERN_ERR, shost, "Could not get host param. "
2663 "netdev for host not set.\n");
2664 return -ENODEV;
2665 }
2666
2667 log_debug(1 << CXGBI_DBG_ISCSI,
2668 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2669 shost, chba, chba->ndev->name, param);
2670
2671 switch (param) {
2672 case ISCSI_HOST_PARAM_HWADDRESS:
2673 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2674 break;
2675 case ISCSI_HOST_PARAM_NETDEV_NAME:
2676 len = sprintf(buf, "%s\n", chba->ndev->name);
2677 break;
2678 case ISCSI_HOST_PARAM_IPADDRESS:
2679 {
2680 struct cxgbi_sock *csk = find_sock_on_port(chba->cdev,
2681 chba->port_id);
2682 if (csk) {
2683 len = sprintf(buf, "%pIS",
2684 (struct sockaddr *)&csk->saddr);
2685 }
2686 log_debug(1 << CXGBI_DBG_ISCSI,
2687 "hba %s, addr %s.\n", chba->ndev->name, buf);
2688 break;
2689 }
2690 default:
2691 return iscsi_host_get_param(shost, param, buf);
2692 }
2693
2694 return len;
2695 }
2696 EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2697
2698 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2699 struct sockaddr *dst_addr,
2700 int non_blocking)
2701 {
2702 struct iscsi_endpoint *ep;
2703 struct cxgbi_endpoint *cep;
2704 struct cxgbi_hba *hba = NULL;
2705 struct cxgbi_sock *csk;
2706 int err = -EINVAL;
2707
2708 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2709 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2710 shost, non_blocking, dst_addr);
2711
2712 if (shost) {
2713 hba = iscsi_host_priv(shost);
2714 if (!hba) {
2715 pr_info("shost 0x%p, priv NULL.\n", shost);
2716 goto err_out;
2717 }
2718 }
2719
2720 if (dst_addr->sa_family == AF_INET) {
2721 csk = cxgbi_check_route(dst_addr);
2722 #if IS_ENABLED(CONFIG_IPV6)
2723 } else if (dst_addr->sa_family == AF_INET6) {
2724 csk = cxgbi_check_route6(dst_addr);
2725 #endif
2726 } else {
2727 pr_info("address family 0x%x NOT supported.\n",
2728 dst_addr->sa_family);
2729 err = -EAFNOSUPPORT;
2730 return (struct iscsi_endpoint *)ERR_PTR(err);
2731 }
2732
2733 if (IS_ERR(csk))
2734 return (struct iscsi_endpoint *)csk;
2735 cxgbi_sock_get(csk);
2736
2737 if (!hba)
2738 hba = csk->cdev->hbas[csk->port_id];
2739 else if (hba != csk->cdev->hbas[csk->port_id]) {
2740 pr_info("Could not connect through requested host %u"
2741 "hba 0x%p != 0x%p (%u).\n",
2742 shost->host_no, hba,
2743 csk->cdev->hbas[csk->port_id], csk->port_id);
2744 err = -ENOSPC;
2745 goto release_conn;
2746 }
2747
2748 err = sock_get_port(csk);
2749 if (err)
2750 goto release_conn;
2751
2752 cxgbi_sock_set_state(csk, CTP_CONNECTING);
2753 err = csk->cdev->csk_init_act_open(csk);
2754 if (err)
2755 goto release_conn;
2756
2757 if (cxgbi_sock_is_closing(csk)) {
2758 err = -ENOSPC;
2759 pr_info("csk 0x%p is closing.\n", csk);
2760 goto release_conn;
2761 }
2762
2763 ep = iscsi_create_endpoint(sizeof(*cep));
2764 if (!ep) {
2765 err = -ENOMEM;
2766 pr_info("iscsi alloc ep, OOM.\n");
2767 goto release_conn;
2768 }
2769
2770 cep = ep->dd_data;
2771 cep->csk = csk;
2772 cep->chba = hba;
2773
2774 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2775 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2776 ep, cep, csk, hba, hba->ndev->name);
2777 return ep;
2778
2779 release_conn:
2780 cxgbi_sock_put(csk);
2781 cxgbi_sock_closed(csk);
2782 err_out:
2783 return ERR_PTR(err);
2784 }
2785 EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2786
2787 int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2788 {
2789 struct cxgbi_endpoint *cep = ep->dd_data;
2790 struct cxgbi_sock *csk = cep->csk;
2791
2792 if (!cxgbi_sock_is_established(csk))
2793 return 0;
2794 return 1;
2795 }
2796 EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2797
2798 void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2799 {
2800 struct cxgbi_endpoint *cep = ep->dd_data;
2801 struct cxgbi_conn *cconn = cep->cconn;
2802 struct cxgbi_sock *csk = cep->csk;
2803
2804 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2805 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2806 ep, cep, cconn, csk, csk->state, csk->flags);
2807
2808 if (cconn && cconn->iconn) {
2809 iscsi_suspend_tx(cconn->iconn);
2810 write_lock_bh(&csk->callback_lock);
2811 cep->csk->user_data = NULL;
2812 cconn->cep = NULL;
2813 write_unlock_bh(&csk->callback_lock);
2814 }
2815 iscsi_destroy_endpoint(ep);
2816
2817 if (likely(csk->state >= CTP_ESTABLISHED))
2818 need_active_close(csk);
2819 else
2820 cxgbi_sock_closed(csk);
2821
2822 cxgbi_sock_put(csk);
2823 }
2824 EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2825
2826 int cxgbi_iscsi_init(struct iscsi_transport *itp,
2827 struct scsi_transport_template **stt)
2828 {
2829 *stt = iscsi_register_transport(itp);
2830 if (*stt == NULL) {
2831 pr_err("unable to register %s transport 0x%p.\n",
2832 itp->name, itp);
2833 return -ENODEV;
2834 }
2835 log_debug(1 << CXGBI_DBG_ISCSI,
2836 "%s, registered iscsi transport 0x%p.\n",
2837 itp->name, stt);
2838 return 0;
2839 }
2840 EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2841
2842 void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2843 struct scsi_transport_template **stt)
2844 {
2845 if (*stt) {
2846 log_debug(1 << CXGBI_DBG_ISCSI,
2847 "de-register transport 0x%p, %s, stt 0x%p.\n",
2848 itp, itp->name, *stt);
2849 *stt = NULL;
2850 iscsi_unregister_transport(itp);
2851 }
2852 }
2853 EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2854
2855 umode_t cxgbi_attr_is_visible(int param_type, int param)
2856 {
2857 switch (param_type) {
2858 case ISCSI_HOST_PARAM:
2859 switch (param) {
2860 case ISCSI_HOST_PARAM_NETDEV_NAME:
2861 case ISCSI_HOST_PARAM_HWADDRESS:
2862 case ISCSI_HOST_PARAM_IPADDRESS:
2863 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2864 return S_IRUGO;
2865 default:
2866 return 0;
2867 }
2868 case ISCSI_PARAM:
2869 switch (param) {
2870 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2871 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2872 case ISCSI_PARAM_HDRDGST_EN:
2873 case ISCSI_PARAM_DATADGST_EN:
2874 case ISCSI_PARAM_CONN_ADDRESS:
2875 case ISCSI_PARAM_CONN_PORT:
2876 case ISCSI_PARAM_EXP_STATSN:
2877 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2878 case ISCSI_PARAM_PERSISTENT_PORT:
2879 case ISCSI_PARAM_PING_TMO:
2880 case ISCSI_PARAM_RECV_TMO:
2881 case ISCSI_PARAM_INITIAL_R2T_EN:
2882 case ISCSI_PARAM_MAX_R2T:
2883 case ISCSI_PARAM_IMM_DATA_EN:
2884 case ISCSI_PARAM_FIRST_BURST:
2885 case ISCSI_PARAM_MAX_BURST:
2886 case ISCSI_PARAM_PDU_INORDER_EN:
2887 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2888 case ISCSI_PARAM_ERL:
2889 case ISCSI_PARAM_TARGET_NAME:
2890 case ISCSI_PARAM_TPGT:
2891 case ISCSI_PARAM_USERNAME:
2892 case ISCSI_PARAM_PASSWORD:
2893 case ISCSI_PARAM_USERNAME_IN:
2894 case ISCSI_PARAM_PASSWORD_IN:
2895 case ISCSI_PARAM_FAST_ABORT:
2896 case ISCSI_PARAM_ABORT_TMO:
2897 case ISCSI_PARAM_LU_RESET_TMO:
2898 case ISCSI_PARAM_TGT_RESET_TMO:
2899 case ISCSI_PARAM_IFACE_NAME:
2900 case ISCSI_PARAM_INITIATOR_NAME:
2901 return S_IRUGO;
2902 default:
2903 return 0;
2904 }
2905 }
2906
2907 return 0;
2908 }
2909 EXPORT_SYMBOL_GPL(cxgbi_attr_is_visible);
2910
2911 static int __init libcxgbi_init_module(void)
2912 {
2913 sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
2914 sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
2915
2916 pr_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
2917 ISCSI_ITT_MASK, sw_tag_idx_bits,
2918 ISCSI_AGE_MASK, sw_tag_age_bits);
2919
2920 ddp_setup_host_page_size();
2921 return 0;
2922 }
2923
2924 static void __exit libcxgbi_exit_module(void)
2925 {
2926 cxgbi_device_unregister_all(0xFF);
2927 return;
2928 }
2929
2930 module_init(libcxgbi_init_module);
2931 module_exit(libcxgbi_exit_module);
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