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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dledford/rdma
[deliverable/linux.git] / drivers / scsi / cxgbi / libcxgbi.c
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 int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
68 unsigned int max_conn)
69 {
70 struct cxgbi_ports_map *pmap = &cdev->pmap;
71
72 pmap->port_csk = cxgbi_alloc_big_mem(max_conn *
73 sizeof(struct cxgbi_sock *),
74 GFP_KERNEL);
75 if (!pmap->port_csk) {
76 pr_warn("cdev 0x%p, portmap OOM %u.\n", cdev, max_conn);
77 return -ENOMEM;
78 }
79
80 pmap->max_connect = max_conn;
81 pmap->sport_base = base;
82 spin_lock_init(&pmap->lock);
83 return 0;
84 }
85 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_create);
86
87 void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev)
88 {
89 struct cxgbi_ports_map *pmap = &cdev->pmap;
90 struct cxgbi_sock *csk;
91 int i;
92
93 for (i = 0; i < pmap->max_connect; i++) {
94 if (pmap->port_csk[i]) {
95 csk = pmap->port_csk[i];
96 pmap->port_csk[i] = NULL;
97 log_debug(1 << CXGBI_DBG_SOCK,
98 "csk 0x%p, cdev 0x%p, offload down.\n",
99 csk, cdev);
100 spin_lock_bh(&csk->lock);
101 cxgbi_sock_set_flag(csk, CTPF_OFFLOAD_DOWN);
102 cxgbi_sock_closed(csk);
103 spin_unlock_bh(&csk->lock);
104 cxgbi_sock_put(csk);
105 }
106 }
107 }
108 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_cleanup);
109
110 static inline void cxgbi_device_destroy(struct cxgbi_device *cdev)
111 {
112 log_debug(1 << CXGBI_DBG_DEV,
113 "cdev 0x%p, p# %u.\n", cdev, cdev->nports);
114 cxgbi_hbas_remove(cdev);
115 cxgbi_device_portmap_cleanup(cdev);
116 if (cdev->dev_ddp_cleanup)
117 cdev->dev_ddp_cleanup(cdev);
118 else
119 cxgbi_ddp_cleanup(cdev);
120 if (cdev->ddp)
121 cxgbi_ddp_cleanup(cdev);
122 if (cdev->pmap.max_connect)
123 cxgbi_free_big_mem(cdev->pmap.port_csk);
124 kfree(cdev);
125 }
126
127 struct cxgbi_device *cxgbi_device_register(unsigned int extra,
128 unsigned int nports)
129 {
130 struct cxgbi_device *cdev;
131
132 cdev = kzalloc(sizeof(*cdev) + extra + nports *
133 (sizeof(struct cxgbi_hba *) +
134 sizeof(struct net_device *)),
135 GFP_KERNEL);
136 if (!cdev) {
137 pr_warn("nport %d, OOM.\n", nports);
138 return NULL;
139 }
140 cdev->ports = (struct net_device **)(cdev + 1);
141 cdev->hbas = (struct cxgbi_hba **)(((char*)cdev->ports) + nports *
142 sizeof(struct net_device *));
143 if (extra)
144 cdev->dd_data = ((char *)cdev->hbas) +
145 nports * sizeof(struct cxgbi_hba *);
146 spin_lock_init(&cdev->pmap.lock);
147
148 mutex_lock(&cdev_mutex);
149 list_add_tail(&cdev->list_head, &cdev_list);
150 mutex_unlock(&cdev_mutex);
151
152 spin_lock(&cdev_rcu_lock);
153 list_add_tail_rcu(&cdev->rcu_node, &cdev_rcu_list);
154 spin_unlock(&cdev_rcu_lock);
155
156 log_debug(1 << CXGBI_DBG_DEV,
157 "cdev 0x%p, p# %u.\n", cdev, nports);
158 return cdev;
159 }
160 EXPORT_SYMBOL_GPL(cxgbi_device_register);
161
162 void cxgbi_device_unregister(struct cxgbi_device *cdev)
163 {
164 log_debug(1 << CXGBI_DBG_DEV,
165 "cdev 0x%p, p# %u,%s.\n",
166 cdev, cdev->nports, cdev->nports ? cdev->ports[0]->name : "");
167
168 mutex_lock(&cdev_mutex);
169 list_del(&cdev->list_head);
170 mutex_unlock(&cdev_mutex);
171
172 spin_lock(&cdev_rcu_lock);
173 list_del_rcu(&cdev->rcu_node);
174 spin_unlock(&cdev_rcu_lock);
175 synchronize_rcu();
176
177 cxgbi_device_destroy(cdev);
178 }
179 EXPORT_SYMBOL_GPL(cxgbi_device_unregister);
180
181 void cxgbi_device_unregister_all(unsigned int flag)
182 {
183 struct cxgbi_device *cdev, *tmp;
184
185 mutex_lock(&cdev_mutex);
186 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
187 if ((cdev->flags & flag) == flag) {
188 mutex_unlock(&cdev_mutex);
189 cxgbi_device_unregister(cdev);
190 mutex_lock(&cdev_mutex);
191 }
192 }
193 mutex_unlock(&cdev_mutex);
194 }
195 EXPORT_SYMBOL_GPL(cxgbi_device_unregister_all);
196
197 struct cxgbi_device *cxgbi_device_find_by_lldev(void *lldev)
198 {
199 struct cxgbi_device *cdev, *tmp;
200
201 mutex_lock(&cdev_mutex);
202 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
203 if (cdev->lldev == lldev) {
204 mutex_unlock(&cdev_mutex);
205 return cdev;
206 }
207 }
208 mutex_unlock(&cdev_mutex);
209
210 log_debug(1 << CXGBI_DBG_DEV,
211 "lldev 0x%p, NO match found.\n", lldev);
212 return NULL;
213 }
214 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev);
215
216 struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev,
217 int *port)
218 {
219 struct net_device *vdev = NULL;
220 struct cxgbi_device *cdev, *tmp;
221 int i;
222
223 if (ndev->priv_flags & IFF_802_1Q_VLAN) {
224 vdev = ndev;
225 ndev = vlan_dev_real_dev(ndev);
226 log_debug(1 << CXGBI_DBG_DEV,
227 "vlan dev %s -> %s.\n", vdev->name, ndev->name);
228 }
229
230 mutex_lock(&cdev_mutex);
231 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
232 for (i = 0; i < cdev->nports; i++) {
233 if (ndev == cdev->ports[i]) {
234 cdev->hbas[i]->vdev = vdev;
235 mutex_unlock(&cdev_mutex);
236 if (port)
237 *port = i;
238 return cdev;
239 }
240 }
241 }
242 mutex_unlock(&cdev_mutex);
243 log_debug(1 << CXGBI_DBG_DEV,
244 "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
245 return NULL;
246 }
247 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev);
248
249 struct cxgbi_device *cxgbi_device_find_by_netdev_rcu(struct net_device *ndev,
250 int *port)
251 {
252 struct net_device *vdev = NULL;
253 struct cxgbi_device *cdev;
254 int i;
255
256 if (ndev->priv_flags & IFF_802_1Q_VLAN) {
257 vdev = ndev;
258 ndev = vlan_dev_real_dev(ndev);
259 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
260 }
261
262 rcu_read_lock();
263 list_for_each_entry_rcu(cdev, &cdev_rcu_list, rcu_node) {
264 for (i = 0; i < cdev->nports; i++) {
265 if (ndev == cdev->ports[i]) {
266 cdev->hbas[i]->vdev = vdev;
267 rcu_read_unlock();
268 if (port)
269 *port = i;
270 return cdev;
271 }
272 }
273 }
274 rcu_read_unlock();
275
276 log_debug(1 << CXGBI_DBG_DEV,
277 "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
278 return NULL;
279 }
280 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev_rcu);
281
282 #if IS_ENABLED(CONFIG_IPV6)
283 static struct cxgbi_device *cxgbi_device_find_by_mac(struct net_device *ndev,
284 int *port)
285 {
286 struct net_device *vdev = NULL;
287 struct cxgbi_device *cdev, *tmp;
288 int i;
289
290 if (ndev->priv_flags & IFF_802_1Q_VLAN) {
291 vdev = ndev;
292 ndev = vlan_dev_real_dev(ndev);
293 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
294 }
295
296 mutex_lock(&cdev_mutex);
297 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
298 for (i = 0; i < cdev->nports; i++) {
299 if (!memcmp(ndev->dev_addr, cdev->ports[i]->dev_addr,
300 MAX_ADDR_LEN)) {
301 cdev->hbas[i]->vdev = vdev;
302 mutex_unlock(&cdev_mutex);
303 if (port)
304 *port = i;
305 return cdev;
306 }
307 }
308 }
309 mutex_unlock(&cdev_mutex);
310 log_debug(1 << CXGBI_DBG_DEV,
311 "ndev 0x%p, %s, NO match mac found.\n",
312 ndev, ndev->name);
313 return NULL;
314 }
315 #endif
316
317 void cxgbi_hbas_remove(struct cxgbi_device *cdev)
318 {
319 int i;
320 struct cxgbi_hba *chba;
321
322 log_debug(1 << CXGBI_DBG_DEV,
323 "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
324
325 for (i = 0; i < cdev->nports; i++) {
326 chba = cdev->hbas[i];
327 if (chba) {
328 cdev->hbas[i] = NULL;
329 iscsi_host_remove(chba->shost);
330 pci_dev_put(cdev->pdev);
331 iscsi_host_free(chba->shost);
332 }
333 }
334 }
335 EXPORT_SYMBOL_GPL(cxgbi_hbas_remove);
336
337 int cxgbi_hbas_add(struct cxgbi_device *cdev, u64 max_lun,
338 unsigned int max_id, struct scsi_host_template *sht,
339 struct scsi_transport_template *stt)
340 {
341 struct cxgbi_hba *chba;
342 struct Scsi_Host *shost;
343 int i, err;
344
345 log_debug(1 << CXGBI_DBG_DEV, "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
346
347 for (i = 0; i < cdev->nports; i++) {
348 shost = iscsi_host_alloc(sht, sizeof(*chba), 1);
349 if (!shost) {
350 pr_info("0x%p, p%d, %s, host alloc failed.\n",
351 cdev, i, cdev->ports[i]->name);
352 err = -ENOMEM;
353 goto err_out;
354 }
355
356 shost->transportt = stt;
357 shost->max_lun = max_lun;
358 shost->max_id = max_id;
359 shost->max_channel = 0;
360 shost->max_cmd_len = 16;
361
362 chba = iscsi_host_priv(shost);
363 chba->cdev = cdev;
364 chba->ndev = cdev->ports[i];
365 chba->shost = shost;
366
367 log_debug(1 << CXGBI_DBG_DEV,
368 "cdev 0x%p, p#%d %s: chba 0x%p.\n",
369 cdev, i, cdev->ports[i]->name, chba);
370
371 pci_dev_get(cdev->pdev);
372 err = iscsi_host_add(shost, &cdev->pdev->dev);
373 if (err) {
374 pr_info("cdev 0x%p, p#%d %s, host add failed.\n",
375 cdev, i, cdev->ports[i]->name);
376 pci_dev_put(cdev->pdev);
377 scsi_host_put(shost);
378 goto err_out;
379 }
380
381 cdev->hbas[i] = chba;
382 }
383
384 return 0;
385
386 err_out:
387 cxgbi_hbas_remove(cdev);
388 return err;
389 }
390 EXPORT_SYMBOL_GPL(cxgbi_hbas_add);
391
392 /*
393 * iSCSI offload
394 *
395 * - source port management
396 * To find a free source port in the port allocation map we use a very simple
397 * rotor scheme to look for the next free port.
398 *
399 * If a source port has been specified make sure that it doesn't collide with
400 * our normal source port allocation map. If it's outside the range of our
401 * allocation/deallocation scheme just let them use it.
402 *
403 * If the source port is outside our allocation range, the caller is
404 * responsible for keeping track of their port usage.
405 */
406
407 static struct cxgbi_sock *find_sock_on_port(struct cxgbi_device *cdev,
408 unsigned char port_id)
409 {
410 struct cxgbi_ports_map *pmap = &cdev->pmap;
411 unsigned int i;
412 unsigned int used;
413
414 if (!pmap->max_connect || !pmap->used)
415 return NULL;
416
417 spin_lock_bh(&pmap->lock);
418 used = pmap->used;
419 for (i = 0; used && i < pmap->max_connect; i++) {
420 struct cxgbi_sock *csk = pmap->port_csk[i];
421
422 if (csk) {
423 if (csk->port_id == port_id) {
424 spin_unlock_bh(&pmap->lock);
425 return csk;
426 }
427 used--;
428 }
429 }
430 spin_unlock_bh(&pmap->lock);
431
432 return NULL;
433 }
434
435 static int sock_get_port(struct cxgbi_sock *csk)
436 {
437 struct cxgbi_device *cdev = csk->cdev;
438 struct cxgbi_ports_map *pmap = &cdev->pmap;
439 unsigned int start;
440 int idx;
441 __be16 *port;
442
443 if (!pmap->max_connect) {
444 pr_err("cdev 0x%p, p#%u %s, NO port map.\n",
445 cdev, csk->port_id, cdev->ports[csk->port_id]->name);
446 return -EADDRNOTAVAIL;
447 }
448
449 if (csk->csk_family == AF_INET)
450 port = &csk->saddr.sin_port;
451 else /* ipv6 */
452 port = &csk->saddr6.sin6_port;
453
454 if (*port) {
455 pr_err("source port NON-ZERO %u.\n",
456 ntohs(*port));
457 return -EADDRINUSE;
458 }
459
460 spin_lock_bh(&pmap->lock);
461 if (pmap->used >= pmap->max_connect) {
462 spin_unlock_bh(&pmap->lock);
463 pr_info("cdev 0x%p, p#%u %s, ALL ports used.\n",
464 cdev, csk->port_id, cdev->ports[csk->port_id]->name);
465 return -EADDRNOTAVAIL;
466 }
467
468 start = idx = pmap->next;
469 do {
470 if (++idx >= pmap->max_connect)
471 idx = 0;
472 if (!pmap->port_csk[idx]) {
473 pmap->used++;
474 *port = htons(pmap->sport_base + idx);
475 pmap->next = idx;
476 pmap->port_csk[idx] = csk;
477 spin_unlock_bh(&pmap->lock);
478 cxgbi_sock_get(csk);
479 log_debug(1 << CXGBI_DBG_SOCK,
480 "cdev 0x%p, p#%u %s, p %u, %u.\n",
481 cdev, csk->port_id,
482 cdev->ports[csk->port_id]->name,
483 pmap->sport_base + idx, pmap->next);
484 return 0;
485 }
486 } while (idx != start);
487 spin_unlock_bh(&pmap->lock);
488
489 /* should not happen */
490 pr_warn("cdev 0x%p, p#%u %s, next %u?\n",
491 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
492 pmap->next);
493 return -EADDRNOTAVAIL;
494 }
495
496 static void sock_put_port(struct cxgbi_sock *csk)
497 {
498 struct cxgbi_device *cdev = csk->cdev;
499 struct cxgbi_ports_map *pmap = &cdev->pmap;
500 __be16 *port;
501
502 if (csk->csk_family == AF_INET)
503 port = &csk->saddr.sin_port;
504 else /* ipv6 */
505 port = &csk->saddr6.sin6_port;
506
507 if (*port) {
508 int idx = ntohs(*port) - pmap->sport_base;
509
510 *port = 0;
511 if (idx < 0 || idx >= pmap->max_connect) {
512 pr_err("cdev 0x%p, p#%u %s, port %u OOR.\n",
513 cdev, csk->port_id,
514 cdev->ports[csk->port_id]->name,
515 ntohs(*port));
516 return;
517 }
518
519 spin_lock_bh(&pmap->lock);
520 pmap->port_csk[idx] = NULL;
521 pmap->used--;
522 spin_unlock_bh(&pmap->lock);
523
524 log_debug(1 << CXGBI_DBG_SOCK,
525 "cdev 0x%p, p#%u %s, release %u.\n",
526 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
527 pmap->sport_base + idx);
528
529 cxgbi_sock_put(csk);
530 }
531 }
532
533 /*
534 * iscsi tcp connection
535 */
536 void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *csk)
537 {
538 if (csk->cpl_close) {
539 kfree_skb(csk->cpl_close);
540 csk->cpl_close = NULL;
541 }
542 if (csk->cpl_abort_req) {
543 kfree_skb(csk->cpl_abort_req);
544 csk->cpl_abort_req = NULL;
545 }
546 if (csk->cpl_abort_rpl) {
547 kfree_skb(csk->cpl_abort_rpl);
548 csk->cpl_abort_rpl = NULL;
549 }
550 }
551 EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs);
552
553 static struct cxgbi_sock *cxgbi_sock_create(struct cxgbi_device *cdev)
554 {
555 struct cxgbi_sock *csk = kzalloc(sizeof(*csk), GFP_NOIO);
556
557 if (!csk) {
558 pr_info("alloc csk %zu failed.\n", sizeof(*csk));
559 return NULL;
560 }
561
562 if (cdev->csk_alloc_cpls(csk) < 0) {
563 pr_info("csk 0x%p, alloc cpls failed.\n", csk);
564 kfree(csk);
565 return NULL;
566 }
567
568 spin_lock_init(&csk->lock);
569 kref_init(&csk->refcnt);
570 skb_queue_head_init(&csk->receive_queue);
571 skb_queue_head_init(&csk->write_queue);
572 setup_timer(&csk->retry_timer, NULL, (unsigned long)csk);
573 rwlock_init(&csk->callback_lock);
574 csk->cdev = cdev;
575 csk->flags = 0;
576 cxgbi_sock_set_state(csk, CTP_CLOSED);
577
578 log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk);
579
580 return csk;
581 }
582
583 static struct rtable *find_route_ipv4(struct flowi4 *fl4,
584 __be32 saddr, __be32 daddr,
585 __be16 sport, __be16 dport, u8 tos)
586 {
587 struct rtable *rt;
588
589 rt = ip_route_output_ports(&init_net, fl4, NULL, daddr, saddr,
590 dport, sport, IPPROTO_TCP, tos, 0);
591 if (IS_ERR(rt))
592 return NULL;
593
594 return rt;
595 }
596
597 static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr)
598 {
599 struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
600 struct dst_entry *dst;
601 struct net_device *ndev;
602 struct cxgbi_device *cdev;
603 struct rtable *rt = NULL;
604 struct neighbour *n;
605 struct flowi4 fl4;
606 struct cxgbi_sock *csk = NULL;
607 unsigned int mtu = 0;
608 int port = 0xFFFF;
609 int err = 0;
610
611 rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0, daddr->sin_port, 0);
612 if (!rt) {
613 pr_info("no route to ipv4 0x%x, port %u.\n",
614 be32_to_cpu(daddr->sin_addr.s_addr),
615 be16_to_cpu(daddr->sin_port));
616 err = -ENETUNREACH;
617 goto err_out;
618 }
619 dst = &rt->dst;
620 n = dst_neigh_lookup(dst, &daddr->sin_addr.s_addr);
621 if (!n) {
622 err = -ENODEV;
623 goto rel_rt;
624 }
625 ndev = n->dev;
626
627 if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
628 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
629 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
630 ndev->name);
631 err = -ENETUNREACH;
632 goto rel_neigh;
633 }
634
635 if (ndev->flags & IFF_LOOPBACK) {
636 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
637 mtu = ndev->mtu;
638 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
639 n->dev->name, ndev->name, mtu);
640 }
641
642 cdev = cxgbi_device_find_by_netdev(ndev, &port);
643 if (!cdev) {
644 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
645 &daddr->sin_addr.s_addr, ndev->name);
646 err = -ENETUNREACH;
647 goto rel_neigh;
648 }
649 log_debug(1 << CXGBI_DBG_SOCK,
650 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
651 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
652 port, ndev->name, cdev);
653
654 csk = cxgbi_sock_create(cdev);
655 if (!csk) {
656 err = -ENOMEM;
657 goto rel_neigh;
658 }
659 csk->cdev = cdev;
660 csk->port_id = port;
661 csk->mtu = mtu;
662 csk->dst = dst;
663
664 csk->csk_family = AF_INET;
665 csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
666 csk->daddr.sin_port = daddr->sin_port;
667 csk->daddr.sin_family = daddr->sin_family;
668 csk->saddr.sin_family = daddr->sin_family;
669 csk->saddr.sin_addr.s_addr = fl4.saddr;
670 neigh_release(n);
671
672 return csk;
673
674 rel_neigh:
675 neigh_release(n);
676
677 rel_rt:
678 ip_rt_put(rt);
679 if (csk)
680 cxgbi_sock_closed(csk);
681 err_out:
682 return ERR_PTR(err);
683 }
684
685 #if IS_ENABLED(CONFIG_IPV6)
686 static struct rt6_info *find_route_ipv6(const struct in6_addr *saddr,
687 const struct in6_addr *daddr)
688 {
689 struct flowi6 fl;
690
691 memset(&fl, 0, sizeof(fl));
692 if (saddr)
693 memcpy(&fl.saddr, saddr, sizeof(struct in6_addr));
694 if (daddr)
695 memcpy(&fl.daddr, daddr, sizeof(struct in6_addr));
696 return (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl);
697 }
698
699 static struct cxgbi_sock *cxgbi_check_route6(struct sockaddr *dst_addr)
700 {
701 struct sockaddr_in6 *daddr6 = (struct sockaddr_in6 *)dst_addr;
702 struct dst_entry *dst;
703 struct net_device *ndev;
704 struct cxgbi_device *cdev;
705 struct rt6_info *rt = NULL;
706 struct neighbour *n;
707 struct in6_addr pref_saddr;
708 struct cxgbi_sock *csk = NULL;
709 unsigned int mtu = 0;
710 int port = 0xFFFF;
711 int err = 0;
712
713 rt = find_route_ipv6(NULL, &daddr6->sin6_addr);
714
715 if (!rt) {
716 pr_info("no route to ipv6 %pI6 port %u\n",
717 daddr6->sin6_addr.s6_addr,
718 be16_to_cpu(daddr6->sin6_port));
719 err = -ENETUNREACH;
720 goto err_out;
721 }
722
723 dst = &rt->dst;
724
725 n = dst_neigh_lookup(dst, &daddr6->sin6_addr);
726
727 if (!n) {
728 pr_info("%pI6, port %u, dst no neighbour.\n",
729 daddr6->sin6_addr.s6_addr,
730 be16_to_cpu(daddr6->sin6_port));
731 err = -ENETUNREACH;
732 goto rel_rt;
733 }
734 ndev = n->dev;
735
736 if (ipv6_addr_is_multicast(&daddr6->sin6_addr)) {
737 pr_info("multi-cast route %pI6 port %u, dev %s.\n",
738 daddr6->sin6_addr.s6_addr,
739 ntohs(daddr6->sin6_port), ndev->name);
740 err = -ENETUNREACH;
741 goto rel_rt;
742 }
743
744 cdev = cxgbi_device_find_by_netdev(ndev, &port);
745 if (!cdev)
746 cdev = cxgbi_device_find_by_mac(ndev, &port);
747 if (!cdev) {
748 pr_info("dst %pI6 %s, NOT cxgbi device.\n",
749 daddr6->sin6_addr.s6_addr, ndev->name);
750 err = -ENETUNREACH;
751 goto rel_rt;
752 }
753 log_debug(1 << CXGBI_DBG_SOCK,
754 "route to %pI6 :%u, ndev p#%d,%s, cdev 0x%p.\n",
755 daddr6->sin6_addr.s6_addr, ntohs(daddr6->sin6_port), port,
756 ndev->name, cdev);
757
758 csk = cxgbi_sock_create(cdev);
759 if (!csk) {
760 err = -ENOMEM;
761 goto rel_rt;
762 }
763 csk->cdev = cdev;
764 csk->port_id = port;
765 csk->mtu = mtu;
766 csk->dst = dst;
767
768 if (ipv6_addr_any(&rt->rt6i_prefsrc.addr)) {
769 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry *)rt);
770
771 err = ipv6_dev_get_saddr(&init_net, idev ? idev->dev : NULL,
772 &daddr6->sin6_addr, 0, &pref_saddr);
773 if (err) {
774 pr_info("failed to get source address to reach %pI6\n",
775 &daddr6->sin6_addr);
776 goto rel_rt;
777 }
778 } else {
779 pref_saddr = rt->rt6i_prefsrc.addr;
780 }
781
782 csk->csk_family = AF_INET6;
783 csk->daddr6.sin6_addr = daddr6->sin6_addr;
784 csk->daddr6.sin6_port = daddr6->sin6_port;
785 csk->daddr6.sin6_family = daddr6->sin6_family;
786 csk->saddr6.sin6_family = daddr6->sin6_family;
787 csk->saddr6.sin6_addr = pref_saddr;
788
789 neigh_release(n);
790 return csk;
791
792 rel_rt:
793 if (n)
794 neigh_release(n);
795
796 ip6_rt_put(rt);
797 if (csk)
798 cxgbi_sock_closed(csk);
799 err_out:
800 return ERR_PTR(err);
801 }
802 #endif /* IS_ENABLED(CONFIG_IPV6) */
803
804 void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
805 unsigned int opt)
806 {
807 csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
808 dst_confirm(csk->dst);
809 smp_mb();
810 cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
811 }
812 EXPORT_SYMBOL_GPL(cxgbi_sock_established);
813
814 static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
815 {
816 log_debug(1 << CXGBI_DBG_SOCK,
817 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
818 csk, csk->state, csk->flags, csk->user_data);
819
820 if (csk->state != CTP_ESTABLISHED) {
821 read_lock_bh(&csk->callback_lock);
822 if (csk->user_data)
823 iscsi_conn_failure(csk->user_data,
824 ISCSI_ERR_TCP_CONN_CLOSE);
825 read_unlock_bh(&csk->callback_lock);
826 }
827 }
828
829 void cxgbi_sock_closed(struct cxgbi_sock *csk)
830 {
831 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
832 csk, (csk)->state, (csk)->flags, (csk)->tid);
833 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
834 if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
835 return;
836 if (csk->saddr.sin_port)
837 sock_put_port(csk);
838 if (csk->dst)
839 dst_release(csk->dst);
840 csk->cdev->csk_release_offload_resources(csk);
841 cxgbi_sock_set_state(csk, CTP_CLOSED);
842 cxgbi_inform_iscsi_conn_closing(csk);
843 cxgbi_sock_put(csk);
844 }
845 EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
846
847 static void need_active_close(struct cxgbi_sock *csk)
848 {
849 int data_lost;
850 int close_req = 0;
851
852 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
853 csk, (csk)->state, (csk)->flags, (csk)->tid);
854 spin_lock_bh(&csk->lock);
855 dst_confirm(csk->dst);
856 data_lost = skb_queue_len(&csk->receive_queue);
857 __skb_queue_purge(&csk->receive_queue);
858
859 if (csk->state == CTP_ACTIVE_OPEN)
860 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
861 else if (csk->state == CTP_ESTABLISHED) {
862 close_req = 1;
863 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
864 } else if (csk->state == CTP_PASSIVE_CLOSE) {
865 close_req = 1;
866 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
867 }
868
869 if (close_req) {
870 if (data_lost)
871 csk->cdev->csk_send_abort_req(csk);
872 else
873 csk->cdev->csk_send_close_req(csk);
874 }
875
876 spin_unlock_bh(&csk->lock);
877 }
878
879 void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
880 {
881 pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
882 csk, csk->state, csk->flags,
883 &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
884 &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
885 errno);
886
887 cxgbi_sock_set_state(csk, CTP_CONNECTING);
888 csk->err = errno;
889 cxgbi_sock_closed(csk);
890 }
891 EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
892
893 void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
894 {
895 struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
896
897 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
898 csk, (csk)->state, (csk)->flags, (csk)->tid);
899 cxgbi_sock_get(csk);
900 spin_lock_bh(&csk->lock);
901 if (csk->state == CTP_ACTIVE_OPEN)
902 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
903 spin_unlock_bh(&csk->lock);
904 cxgbi_sock_put(csk);
905 __kfree_skb(skb);
906 }
907 EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
908
909 void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
910 {
911 cxgbi_sock_get(csk);
912 spin_lock_bh(&csk->lock);
913
914 cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
915 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
916 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
917 if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
918 pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
919 csk, csk->state, csk->flags, csk->tid);
920 cxgbi_sock_closed(csk);
921 }
922
923 spin_unlock_bh(&csk->lock);
924 cxgbi_sock_put(csk);
925 }
926 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
927
928 void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
929 {
930 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
931 csk, (csk)->state, (csk)->flags, (csk)->tid);
932 cxgbi_sock_get(csk);
933 spin_lock_bh(&csk->lock);
934
935 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
936 goto done;
937
938 switch (csk->state) {
939 case CTP_ESTABLISHED:
940 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
941 break;
942 case CTP_ACTIVE_CLOSE:
943 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
944 break;
945 case CTP_CLOSE_WAIT_1:
946 cxgbi_sock_closed(csk);
947 break;
948 case CTP_ABORTING:
949 break;
950 default:
951 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
952 csk, csk->state, csk->flags, csk->tid);
953 }
954 cxgbi_inform_iscsi_conn_closing(csk);
955 done:
956 spin_unlock_bh(&csk->lock);
957 cxgbi_sock_put(csk);
958 }
959 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
960
961 void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
962 {
963 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
964 csk, (csk)->state, (csk)->flags, (csk)->tid);
965 cxgbi_sock_get(csk);
966 spin_lock_bh(&csk->lock);
967
968 csk->snd_una = snd_nxt - 1;
969 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
970 goto done;
971
972 switch (csk->state) {
973 case CTP_ACTIVE_CLOSE:
974 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
975 break;
976 case CTP_CLOSE_WAIT_1:
977 case CTP_CLOSE_WAIT_2:
978 cxgbi_sock_closed(csk);
979 break;
980 case CTP_ABORTING:
981 break;
982 default:
983 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
984 csk, csk->state, csk->flags, csk->tid);
985 }
986 done:
987 spin_unlock_bh(&csk->lock);
988 cxgbi_sock_put(csk);
989 }
990 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
991
992 void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
993 unsigned int snd_una, int seq_chk)
994 {
995 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
996 "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
997 csk, csk->state, csk->flags, csk->tid, credits,
998 csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
999
1000 spin_lock_bh(&csk->lock);
1001
1002 csk->wr_cred += credits;
1003 if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
1004 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
1005
1006 while (credits) {
1007 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
1008
1009 if (unlikely(!p)) {
1010 pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
1011 csk, csk->state, csk->flags, csk->tid, credits,
1012 csk->wr_cred, csk->wr_una_cred);
1013 break;
1014 }
1015
1016 if (unlikely(credits < p->csum)) {
1017 pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
1018 csk, csk->state, csk->flags, csk->tid,
1019 credits, csk->wr_cred, csk->wr_una_cred,
1020 p->csum);
1021 p->csum -= credits;
1022 break;
1023 } else {
1024 cxgbi_sock_dequeue_wr(csk);
1025 credits -= p->csum;
1026 kfree_skb(p);
1027 }
1028 }
1029
1030 cxgbi_sock_check_wr_invariants(csk);
1031
1032 if (seq_chk) {
1033 if (unlikely(before(snd_una, csk->snd_una))) {
1034 pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
1035 csk, csk->state, csk->flags, csk->tid, snd_una,
1036 csk->snd_una);
1037 goto done;
1038 }
1039
1040 if (csk->snd_una != snd_una) {
1041 csk->snd_una = snd_una;
1042 dst_confirm(csk->dst);
1043 }
1044 }
1045
1046 if (skb_queue_len(&csk->write_queue)) {
1047 if (csk->cdev->csk_push_tx_frames(csk, 0))
1048 cxgbi_conn_tx_open(csk);
1049 } else
1050 cxgbi_conn_tx_open(csk);
1051 done:
1052 spin_unlock_bh(&csk->lock);
1053 }
1054 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
1055
1056 static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
1057 unsigned short mtu)
1058 {
1059 int i = 0;
1060
1061 while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
1062 ++i;
1063
1064 return i;
1065 }
1066
1067 unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
1068 {
1069 unsigned int idx;
1070 struct dst_entry *dst = csk->dst;
1071
1072 csk->advmss = dst_metric_advmss(dst);
1073
1074 if (csk->advmss > pmtu - 40)
1075 csk->advmss = pmtu - 40;
1076 if (csk->advmss < csk->cdev->mtus[0] - 40)
1077 csk->advmss = csk->cdev->mtus[0] - 40;
1078 idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
1079
1080 return idx;
1081 }
1082 EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
1083
1084 void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
1085 {
1086 cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
1087 __skb_queue_tail(&csk->write_queue, skb);
1088 }
1089 EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
1090
1091 void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
1092 {
1093 struct sk_buff *skb;
1094
1095 while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
1096 kfree_skb(skb);
1097 }
1098 EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
1099
1100 void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
1101 {
1102 int pending = cxgbi_sock_count_pending_wrs(csk);
1103
1104 if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
1105 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
1106 csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
1107 }
1108 EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
1109
1110 static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
1111 {
1112 struct cxgbi_device *cdev = csk->cdev;
1113 struct sk_buff *next;
1114 int err, copied = 0;
1115
1116 spin_lock_bh(&csk->lock);
1117
1118 if (csk->state != CTP_ESTABLISHED) {
1119 log_debug(1 << CXGBI_DBG_PDU_TX,
1120 "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
1121 csk, csk->state, csk->flags, csk->tid);
1122 err = -EAGAIN;
1123 goto out_err;
1124 }
1125
1126 if (csk->err) {
1127 log_debug(1 << CXGBI_DBG_PDU_TX,
1128 "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
1129 csk, csk->state, csk->flags, csk->tid, csk->err);
1130 err = -EPIPE;
1131 goto out_err;
1132 }
1133
1134 if (csk->write_seq - csk->snd_una >= csk->snd_win) {
1135 log_debug(1 << CXGBI_DBG_PDU_TX,
1136 "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
1137 csk, csk->state, csk->flags, csk->tid, csk->write_seq,
1138 csk->snd_una, csk->snd_win);
1139 err = -ENOBUFS;
1140 goto out_err;
1141 }
1142
1143 while (skb) {
1144 int frags = skb_shinfo(skb)->nr_frags +
1145 (skb->len != skb->data_len);
1146
1147 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
1148 pr_err("csk 0x%p, skb head %u < %u.\n",
1149 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
1150 err = -EINVAL;
1151 goto out_err;
1152 }
1153
1154 if (frags >= SKB_WR_LIST_SIZE) {
1155 pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
1156 csk, skb_shinfo(skb)->nr_frags, skb->len,
1157 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
1158 err = -EINVAL;
1159 goto out_err;
1160 }
1161
1162 next = skb->next;
1163 skb->next = NULL;
1164 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
1165 cxgbi_sock_skb_entail(csk, skb);
1166 copied += skb->len;
1167 csk->write_seq += skb->len +
1168 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
1169 skb = next;
1170 }
1171 done:
1172 if (likely(skb_queue_len(&csk->write_queue)))
1173 cdev->csk_push_tx_frames(csk, 1);
1174 spin_unlock_bh(&csk->lock);
1175 return copied;
1176
1177 out_err:
1178 if (copied == 0 && err == -EPIPE)
1179 copied = csk->err ? csk->err : -EPIPE;
1180 else
1181 copied = err;
1182 goto done;
1183 }
1184
1185 /*
1186 * Direct Data Placement -
1187 * Directly place the iSCSI Data-In or Data-Out PDU's payload into pre-posted
1188 * final destination host-memory buffers based on the Initiator Task Tag (ITT)
1189 * in Data-In or Target Task Tag (TTT) in Data-Out PDUs.
1190 * The host memory address is programmed into h/w in the format of pagepod
1191 * entries.
1192 * The location of the pagepod entry is encoded into ddp tag which is used as
1193 * the base for ITT/TTT.
1194 */
1195
1196 static unsigned char ddp_page_order[DDP_PGIDX_MAX] = {0, 1, 2, 4};
1197 static unsigned char ddp_page_shift[DDP_PGIDX_MAX] = {12, 13, 14, 16};
1198 static unsigned char page_idx = DDP_PGIDX_MAX;
1199
1200 static unsigned char sw_tag_idx_bits;
1201 static unsigned char sw_tag_age_bits;
1202
1203 /*
1204 * Direct-Data Placement page size adjustment
1205 */
1206 static int ddp_adjust_page_table(void)
1207 {
1208 int i;
1209 unsigned int base_order, order;
1210
1211 if (PAGE_SIZE < (1UL << ddp_page_shift[0])) {
1212 pr_info("PAGE_SIZE 0x%lx too small, min 0x%lx\n",
1213 PAGE_SIZE, 1UL << ddp_page_shift[0]);
1214 return -EINVAL;
1215 }
1216
1217 base_order = get_order(1UL << ddp_page_shift[0]);
1218 order = get_order(1UL << PAGE_SHIFT);
1219
1220 for (i = 0; i < DDP_PGIDX_MAX; i++) {
1221 /* first is the kernel page size, then just doubling */
1222 ddp_page_order[i] = order - base_order + i;
1223 ddp_page_shift[i] = PAGE_SHIFT + i;
1224 }
1225 return 0;
1226 }
1227
1228 static int ddp_find_page_index(unsigned long pgsz)
1229 {
1230 int i;
1231
1232 for (i = 0; i < DDP_PGIDX_MAX; i++) {
1233 if (pgsz == (1UL << ddp_page_shift[i]))
1234 return i;
1235 }
1236 pr_info("ddp page size %lu not supported.\n", pgsz);
1237 return DDP_PGIDX_MAX;
1238 }
1239
1240 static void ddp_setup_host_page_size(void)
1241 {
1242 if (page_idx == DDP_PGIDX_MAX) {
1243 page_idx = ddp_find_page_index(PAGE_SIZE);
1244
1245 if (page_idx == DDP_PGIDX_MAX) {
1246 pr_info("system PAGE %lu, update hw.\n", PAGE_SIZE);
1247 if (ddp_adjust_page_table() < 0) {
1248 pr_info("PAGE %lu, disable ddp.\n", PAGE_SIZE);
1249 return;
1250 }
1251 page_idx = ddp_find_page_index(PAGE_SIZE);
1252 }
1253 pr_info("system PAGE %lu, ddp idx %u.\n", PAGE_SIZE, page_idx);
1254 }
1255 }
1256
1257 void cxgbi_ddp_page_size_factor(int *pgsz_factor)
1258 {
1259 int i;
1260
1261 for (i = 0; i < DDP_PGIDX_MAX; i++)
1262 pgsz_factor[i] = ddp_page_order[i];
1263 }
1264 EXPORT_SYMBOL_GPL(cxgbi_ddp_page_size_factor);
1265
1266 /*
1267 * DDP setup & teardown
1268 */
1269
1270 void cxgbi_ddp_ppod_set(struct cxgbi_pagepod *ppod,
1271 struct cxgbi_pagepod_hdr *hdr,
1272 struct cxgbi_gather_list *gl, unsigned int gidx)
1273 {
1274 int i;
1275
1276 memcpy(ppod, hdr, sizeof(*hdr));
1277 for (i = 0; i < (PPOD_PAGES_MAX + 1); i++, gidx++) {
1278 ppod->addr[i] = gidx < gl->nelem ?
1279 cpu_to_be64(gl->phys_addr[gidx]) : 0ULL;
1280 }
1281 }
1282 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_set);
1283
1284 void cxgbi_ddp_ppod_clear(struct cxgbi_pagepod *ppod)
1285 {
1286 memset(ppod, 0, sizeof(*ppod));
1287 }
1288 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_clear);
1289
1290 static inline int ddp_find_unused_entries(struct cxgbi_ddp_info *ddp,
1291 unsigned int start, unsigned int max,
1292 unsigned int count,
1293 struct cxgbi_gather_list *gl)
1294 {
1295 unsigned int i, j, k;
1296
1297 /* not enough entries */
1298 if ((max - start) < count) {
1299 log_debug(1 << CXGBI_DBG_DDP,
1300 "NOT enough entries %u+%u < %u.\n", start, count, max);
1301 return -EBUSY;
1302 }
1303
1304 max -= count;
1305 spin_lock(&ddp->map_lock);
1306 for (i = start; i < max;) {
1307 for (j = 0, k = i; j < count; j++, k++) {
1308 if (ddp->gl_map[k])
1309 break;
1310 }
1311 if (j == count) {
1312 for (j = 0, k = i; j < count; j++, k++)
1313 ddp->gl_map[k] = gl;
1314 spin_unlock(&ddp->map_lock);
1315 return i;
1316 }
1317 i += j + 1;
1318 }
1319 spin_unlock(&ddp->map_lock);
1320 log_debug(1 << CXGBI_DBG_DDP,
1321 "NO suitable entries %u available.\n", count);
1322 return -EBUSY;
1323 }
1324
1325 static inline void ddp_unmark_entries(struct cxgbi_ddp_info *ddp,
1326 int start, int count)
1327 {
1328 spin_lock(&ddp->map_lock);
1329 memset(&ddp->gl_map[start], 0,
1330 count * sizeof(struct cxgbi_gather_list *));
1331 spin_unlock(&ddp->map_lock);
1332 }
1333
1334 static inline void ddp_gl_unmap(struct pci_dev *pdev,
1335 struct cxgbi_gather_list *gl)
1336 {
1337 int i;
1338
1339 for (i = 0; i < gl->nelem; i++)
1340 dma_unmap_page(&pdev->dev, gl->phys_addr[i], PAGE_SIZE,
1341 PCI_DMA_FROMDEVICE);
1342 }
1343
1344 static inline int ddp_gl_map(struct pci_dev *pdev,
1345 struct cxgbi_gather_list *gl)
1346 {
1347 int i;
1348
1349 for (i = 0; i < gl->nelem; i++) {
1350 gl->phys_addr[i] = dma_map_page(&pdev->dev, gl->pages[i], 0,
1351 PAGE_SIZE,
1352 PCI_DMA_FROMDEVICE);
1353 if (unlikely(dma_mapping_error(&pdev->dev, gl->phys_addr[i]))) {
1354 log_debug(1 << CXGBI_DBG_DDP,
1355 "page %d 0x%p, 0x%p dma mapping err.\n",
1356 i, gl->pages[i], pdev);
1357 goto unmap;
1358 }
1359 }
1360 return i;
1361 unmap:
1362 if (i) {
1363 unsigned int nelem = gl->nelem;
1364
1365 gl->nelem = i;
1366 ddp_gl_unmap(pdev, gl);
1367 gl->nelem = nelem;
1368 }
1369 return -EINVAL;
1370 }
1371
1372 static void ddp_release_gl(struct cxgbi_gather_list *gl,
1373 struct pci_dev *pdev)
1374 {
1375 ddp_gl_unmap(pdev, gl);
1376 kfree(gl);
1377 }
1378
1379 static struct cxgbi_gather_list *ddp_make_gl(unsigned int xferlen,
1380 struct scatterlist *sgl,
1381 unsigned int sgcnt,
1382 struct pci_dev *pdev,
1383 gfp_t gfp)
1384 {
1385 struct cxgbi_gather_list *gl;
1386 struct scatterlist *sg = sgl;
1387 struct page *sgpage = sg_page(sg);
1388 unsigned int sglen = sg->length;
1389 unsigned int sgoffset = sg->offset;
1390 unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >>
1391 PAGE_SHIFT;
1392 int i = 1, j = 0;
1393
1394 if (xferlen < DDP_THRESHOLD) {
1395 log_debug(1 << CXGBI_DBG_DDP,
1396 "xfer %u < threshold %u, no ddp.\n",
1397 xferlen, DDP_THRESHOLD);
1398 return NULL;
1399 }
1400
1401 gl = kzalloc(sizeof(struct cxgbi_gather_list) +
1402 npages * (sizeof(dma_addr_t) +
1403 sizeof(struct page *)), gfp);
1404 if (!gl) {
1405 log_debug(1 << CXGBI_DBG_DDP,
1406 "xfer %u, %u pages, OOM.\n", xferlen, npages);
1407 return NULL;
1408 }
1409
1410 log_debug(1 << CXGBI_DBG_DDP,
1411 "xfer %u, sgl %u, gl max %u.\n", xferlen, sgcnt, npages);
1412
1413 gl->pages = (struct page **)&gl->phys_addr[npages];
1414 gl->nelem = npages;
1415 gl->length = xferlen;
1416 gl->offset = sgoffset;
1417 gl->pages[0] = sgpage;
1418
1419 for (i = 1, sg = sg_next(sgl), j = 0; i < sgcnt;
1420 i++, sg = sg_next(sg)) {
1421 struct page *page = sg_page(sg);
1422
1423 if (sgpage == page && sg->offset == sgoffset + sglen)
1424 sglen += sg->length;
1425 else {
1426 /* make sure the sgl is fit for ddp:
1427 * each has the same page size, and
1428 * all of the middle pages are used completely
1429 */
1430 if ((j && sgoffset) || ((i != sgcnt - 1) &&
1431 ((sglen + sgoffset) & ~PAGE_MASK))) {
1432 log_debug(1 << CXGBI_DBG_DDP,
1433 "page %d/%u, %u + %u.\n",
1434 i, sgcnt, sgoffset, sglen);
1435 goto error_out;
1436 }
1437
1438 j++;
1439 if (j == gl->nelem || sg->offset) {
1440 log_debug(1 << CXGBI_DBG_DDP,
1441 "page %d/%u, offset %u.\n",
1442 j, gl->nelem, sg->offset);
1443 goto error_out;
1444 }
1445 gl->pages[j] = page;
1446 sglen = sg->length;
1447 sgoffset = sg->offset;
1448 sgpage = page;
1449 }
1450 }
1451 gl->nelem = ++j;
1452
1453 if (ddp_gl_map(pdev, gl) < 0)
1454 goto error_out;
1455
1456 return gl;
1457
1458 error_out:
1459 kfree(gl);
1460 return NULL;
1461 }
1462
1463 static void ddp_tag_release(struct cxgbi_hba *chba, u32 tag)
1464 {
1465 struct cxgbi_device *cdev = chba->cdev;
1466 struct cxgbi_ddp_info *ddp = cdev->ddp;
1467 u32 idx;
1468
1469 idx = (tag >> PPOD_IDX_SHIFT) & ddp->idx_mask;
1470 if (idx < ddp->nppods) {
1471 struct cxgbi_gather_list *gl = ddp->gl_map[idx];
1472 unsigned int npods;
1473
1474 if (!gl || !gl->nelem) {
1475 pr_warn("tag 0x%x, idx %u, gl 0x%p, %u.\n",
1476 tag, idx, gl, gl ? gl->nelem : 0);
1477 return;
1478 }
1479 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1480 log_debug(1 << CXGBI_DBG_DDP,
1481 "tag 0x%x, release idx %u, npods %u.\n",
1482 tag, idx, npods);
1483 cdev->csk_ddp_clear(chba, tag, idx, npods);
1484 ddp_unmark_entries(ddp, idx, npods);
1485 ddp_release_gl(gl, ddp->pdev);
1486 } else
1487 pr_warn("tag 0x%x, idx %u > max %u.\n", tag, idx, ddp->nppods);
1488 }
1489
1490 static int ddp_tag_reserve(struct cxgbi_sock *csk, unsigned int tid,
1491 u32 sw_tag, u32 *tagp, struct cxgbi_gather_list *gl,
1492 gfp_t gfp)
1493 {
1494 struct cxgbi_device *cdev = csk->cdev;
1495 struct cxgbi_ddp_info *ddp = cdev->ddp;
1496 struct cxgbi_tag_format *tformat = &cdev->tag_format;
1497 struct cxgbi_pagepod_hdr hdr;
1498 unsigned int npods;
1499 int idx = -1;
1500 int err = -ENOMEM;
1501 u32 tag;
1502
1503 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1504 if (ddp->idx_last == ddp->nppods)
1505 idx = ddp_find_unused_entries(ddp, 0, ddp->nppods,
1506 npods, gl);
1507 else {
1508 idx = ddp_find_unused_entries(ddp, ddp->idx_last + 1,
1509 ddp->nppods, npods,
1510 gl);
1511 if (idx < 0 && ddp->idx_last >= npods) {
1512 idx = ddp_find_unused_entries(ddp, 0,
1513 min(ddp->idx_last + npods, ddp->nppods),
1514 npods, gl);
1515 }
1516 }
1517 if (idx < 0) {
1518 log_debug(1 << CXGBI_DBG_DDP,
1519 "xferlen %u, gl %u, npods %u NO DDP.\n",
1520 gl->length, gl->nelem, npods);
1521 return idx;
1522 }
1523
1524 tag = cxgbi_ddp_tag_base(tformat, sw_tag);
1525 tag |= idx << PPOD_IDX_SHIFT;
1526
1527 hdr.rsvd = 0;
1528 hdr.vld_tid = htonl(PPOD_VALID_FLAG | PPOD_TID(tid));
1529 hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask);
1530 hdr.max_offset = htonl(gl->length);
1531 hdr.page_offset = htonl(gl->offset);
1532
1533 err = cdev->csk_ddp_set(csk, &hdr, idx, npods, gl);
1534 if (err < 0)
1535 goto unmark_entries;
1536
1537 ddp->idx_last = idx;
1538 log_debug(1 << CXGBI_DBG_DDP,
1539 "xfer %u, gl %u,%u, tid 0x%x, tag 0x%x->0x%x(%u,%u).\n",
1540 gl->length, gl->nelem, gl->offset, tid, sw_tag, tag, idx,
1541 npods);
1542 *tagp = tag;
1543 return 0;
1544
1545 unmark_entries:
1546 ddp_unmark_entries(ddp, idx, npods);
1547 return err;
1548 }
1549
1550 int cxgbi_ddp_reserve(struct cxgbi_sock *csk, unsigned int *tagp,
1551 unsigned int sw_tag, unsigned int xferlen,
1552 struct scatterlist *sgl, unsigned int sgcnt, gfp_t gfp)
1553 {
1554 struct cxgbi_device *cdev = csk->cdev;
1555 struct cxgbi_tag_format *tformat = &cdev->tag_format;
1556 struct cxgbi_gather_list *gl;
1557 int err;
1558
1559 if (page_idx >= DDP_PGIDX_MAX || !cdev->ddp ||
1560 xferlen < DDP_THRESHOLD) {
1561 log_debug(1 << CXGBI_DBG_DDP,
1562 "pgidx %u, xfer %u, NO ddp.\n", page_idx, xferlen);
1563 return -EINVAL;
1564 }
1565
1566 if (!cxgbi_sw_tag_usable(tformat, sw_tag)) {
1567 log_debug(1 << CXGBI_DBG_DDP,
1568 "sw_tag 0x%x NOT usable.\n", sw_tag);
1569 return -EINVAL;
1570 }
1571
1572 gl = ddp_make_gl(xferlen, sgl, sgcnt, cdev->pdev, gfp);
1573 if (!gl)
1574 return -ENOMEM;
1575
1576 err = ddp_tag_reserve(csk, csk->tid, sw_tag, tagp, gl, gfp);
1577 if (err < 0)
1578 ddp_release_gl(gl, cdev->pdev);
1579
1580 return err;
1581 }
1582
1583 static void ddp_destroy(struct kref *kref)
1584 {
1585 struct cxgbi_ddp_info *ddp = container_of(kref,
1586 struct cxgbi_ddp_info,
1587 refcnt);
1588 struct cxgbi_device *cdev = ddp->cdev;
1589 int i = 0;
1590
1591 pr_info("kref 0, destroy ddp 0x%p, cdev 0x%p.\n", ddp, cdev);
1592
1593 while (i < ddp->nppods) {
1594 struct cxgbi_gather_list *gl = ddp->gl_map[i];
1595
1596 if (gl) {
1597 int npods = (gl->nelem + PPOD_PAGES_MAX - 1)
1598 >> PPOD_PAGES_SHIFT;
1599 pr_info("cdev 0x%p, ddp %d + %d.\n", cdev, i, npods);
1600 kfree(gl);
1601 i += npods;
1602 } else
1603 i++;
1604 }
1605 cxgbi_free_big_mem(ddp);
1606 }
1607
1608 int cxgbi_ddp_cleanup(struct cxgbi_device *cdev)
1609 {
1610 struct cxgbi_ddp_info *ddp = cdev->ddp;
1611
1612 log_debug(1 << CXGBI_DBG_DDP,
1613 "cdev 0x%p, release ddp 0x%p.\n", cdev, ddp);
1614 cdev->ddp = NULL;
1615 if (ddp)
1616 return kref_put(&ddp->refcnt, ddp_destroy);
1617 return 0;
1618 }
1619 EXPORT_SYMBOL_GPL(cxgbi_ddp_cleanup);
1620
1621 int cxgbi_ddp_init(struct cxgbi_device *cdev,
1622 unsigned int llimit, unsigned int ulimit,
1623 unsigned int max_txsz, unsigned int max_rxsz)
1624 {
1625 struct cxgbi_ddp_info *ddp;
1626 unsigned int ppmax, bits;
1627
1628 ppmax = (ulimit - llimit + 1) >> PPOD_SIZE_SHIFT;
1629 bits = __ilog2_u32(ppmax) + 1;
1630 if (bits > PPOD_IDX_MAX_SIZE)
1631 bits = PPOD_IDX_MAX_SIZE;
1632 ppmax = (1 << (bits - 1)) - 1;
1633
1634 ddp = cxgbi_alloc_big_mem(sizeof(struct cxgbi_ddp_info) +
1635 ppmax * (sizeof(struct cxgbi_gather_list *) +
1636 sizeof(struct sk_buff *)),
1637 GFP_KERNEL);
1638 if (!ddp) {
1639 pr_warn("cdev 0x%p, ddp ppmax %u OOM.\n", cdev, ppmax);
1640 return -ENOMEM;
1641 }
1642 ddp->gl_map = (struct cxgbi_gather_list **)(ddp + 1);
1643 cdev->ddp = ddp;
1644
1645 spin_lock_init(&ddp->map_lock);
1646 kref_init(&ddp->refcnt);
1647
1648 ddp->cdev = cdev;
1649 ddp->pdev = cdev->pdev;
1650 ddp->llimit = llimit;
1651 ddp->ulimit = ulimit;
1652 ddp->max_txsz = min_t(unsigned int, max_txsz, ULP2_MAX_PKT_SIZE);
1653 ddp->max_rxsz = min_t(unsigned int, max_rxsz, ULP2_MAX_PKT_SIZE);
1654 ddp->nppods = ppmax;
1655 ddp->idx_last = ppmax;
1656 ddp->idx_bits = bits;
1657 ddp->idx_mask = (1 << bits) - 1;
1658 ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1;
1659
1660 cdev->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
1661 cdev->tag_format.rsvd_bits = ddp->idx_bits;
1662 cdev->tag_format.rsvd_shift = PPOD_IDX_SHIFT;
1663 cdev->tag_format.rsvd_mask = (1 << cdev->tag_format.rsvd_bits) - 1;
1664
1665 pr_info("%s tag format, sw %u, rsvd %u,%u, mask 0x%x.\n",
1666 cdev->ports[0]->name, cdev->tag_format.sw_bits,
1667 cdev->tag_format.rsvd_bits, cdev->tag_format.rsvd_shift,
1668 cdev->tag_format.rsvd_mask);
1669
1670 cdev->tx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1671 ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
1672 cdev->rx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1673 ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);
1674
1675 log_debug(1 << CXGBI_DBG_DDP,
1676 "%s max payload size: %u/%u, %u/%u.\n",
1677 cdev->ports[0]->name, cdev->tx_max_size, ddp->max_txsz,
1678 cdev->rx_max_size, ddp->max_rxsz);
1679 return 0;
1680 }
1681 EXPORT_SYMBOL_GPL(cxgbi_ddp_init);
1682
1683 /*
1684 * APIs interacting with open-iscsi libraries
1685 */
1686
1687 static unsigned char padding[4];
1688
1689 static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1690 {
1691 struct scsi_cmnd *sc = task->sc;
1692 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1693 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1694 struct cxgbi_hba *chba = cconn->chba;
1695 struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1696 u32 tag = ntohl((__force u32)hdr_itt);
1697
1698 log_debug(1 << CXGBI_DBG_DDP,
1699 "cdev 0x%p, release tag 0x%x.\n", chba->cdev, tag);
1700 if (sc &&
1701 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
1702 cxgbi_is_ddp_tag(tformat, tag))
1703 ddp_tag_release(chba, tag);
1704 }
1705
1706 static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1707 {
1708 struct scsi_cmnd *sc = task->sc;
1709 struct iscsi_conn *conn = task->conn;
1710 struct iscsi_session *sess = conn->session;
1711 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1712 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1713 struct cxgbi_hba *chba = cconn->chba;
1714 struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1715 u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
1716 u32 tag = 0;
1717 int err = -EINVAL;
1718
1719 if (sc &&
1720 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)) {
1721 err = cxgbi_ddp_reserve(cconn->cep->csk, &tag, sw_tag,
1722 scsi_in(sc)->length,
1723 scsi_in(sc)->table.sgl,
1724 scsi_in(sc)->table.nents,
1725 GFP_ATOMIC);
1726 if (err < 0)
1727 log_debug(1 << CXGBI_DBG_DDP,
1728 "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1729 cconn->cep->csk, task, scsi_in(sc)->length,
1730 scsi_in(sc)->table.nents);
1731 }
1732
1733 if (err < 0)
1734 tag = cxgbi_set_non_ddp_tag(tformat, sw_tag);
1735 /* the itt need to sent in big-endian order */
1736 *hdr_itt = (__force itt_t)htonl(tag);
1737
1738 log_debug(1 << CXGBI_DBG_DDP,
1739 "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1740 chba->cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1741 return 0;
1742 }
1743
1744 void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1745 {
1746 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1747 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1748 struct cxgbi_device *cdev = cconn->chba->cdev;
1749 u32 tag = ntohl((__force u32) itt);
1750 u32 sw_bits;
1751
1752 sw_bits = cxgbi_tag_nonrsvd_bits(&cdev->tag_format, tag);
1753 if (idx)
1754 *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
1755 if (age)
1756 *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
1757
1758 log_debug(1 << CXGBI_DBG_DDP,
1759 "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1760 cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1761 age ? *age : 0xFF);
1762 }
1763 EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1764
1765 void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1766 {
1767 struct iscsi_conn *conn = csk->user_data;
1768
1769 if (conn) {
1770 log_debug(1 << CXGBI_DBG_SOCK,
1771 "csk 0x%p, cid %d.\n", csk, conn->id);
1772 iscsi_conn_queue_work(conn);
1773 }
1774 }
1775 EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1776
1777 /*
1778 * pdu receive, interact with libiscsi_tcp
1779 */
1780 static inline int read_pdu_skb(struct iscsi_conn *conn,
1781 struct sk_buff *skb,
1782 unsigned int offset,
1783 int offloaded)
1784 {
1785 int status = 0;
1786 int bytes_read;
1787
1788 bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1789 switch (status) {
1790 case ISCSI_TCP_CONN_ERR:
1791 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1792 skb, offset, offloaded);
1793 return -EIO;
1794 case ISCSI_TCP_SUSPENDED:
1795 log_debug(1 << CXGBI_DBG_PDU_RX,
1796 "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1797 skb, offset, offloaded, bytes_read);
1798 /* no transfer - just have caller flush queue */
1799 return bytes_read;
1800 case ISCSI_TCP_SKB_DONE:
1801 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1802 skb, offset, offloaded);
1803 /*
1804 * pdus should always fit in the skb and we should get
1805 * segment done notifcation.
1806 */
1807 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1808 return -EFAULT;
1809 case ISCSI_TCP_SEGMENT_DONE:
1810 log_debug(1 << CXGBI_DBG_PDU_RX,
1811 "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1812 skb, offset, offloaded, bytes_read);
1813 return bytes_read;
1814 default:
1815 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1816 skb, offset, offloaded, status);
1817 return -EINVAL;
1818 }
1819 }
1820
1821 static int skb_read_pdu_bhs(struct iscsi_conn *conn, struct sk_buff *skb)
1822 {
1823 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1824
1825 log_debug(1 << CXGBI_DBG_PDU_RX,
1826 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1827 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1828
1829 if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1830 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1831 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1832 return -EIO;
1833 }
1834
1835 if (conn->hdrdgst_en &&
1836 cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1837 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1838 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1839 return -EIO;
1840 }
1841
1842 return read_pdu_skb(conn, skb, 0, 0);
1843 }
1844
1845 static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1846 struct sk_buff *skb, unsigned int offset)
1847 {
1848 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1849 bool offloaded = 0;
1850 int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1851
1852 log_debug(1 << CXGBI_DBG_PDU_RX,
1853 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1854 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1855
1856 if (conn->datadgst_en &&
1857 cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1858 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1859 conn, lskb, cxgbi_skcb_flags(lskb));
1860 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1861 return -EIO;
1862 }
1863
1864 if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1865 return 0;
1866
1867 /* coalesced, add header digest length */
1868 if (lskb == skb && conn->hdrdgst_en)
1869 offset += ISCSI_DIGEST_SIZE;
1870
1871 if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1872 offloaded = 1;
1873
1874 if (opcode == ISCSI_OP_SCSI_DATA_IN)
1875 log_debug(1 << CXGBI_DBG_PDU_RX,
1876 "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1877 skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1878 tcp_conn->in.datalen, offloaded ? "is" : "not");
1879
1880 return read_pdu_skb(conn, skb, offset, offloaded);
1881 }
1882
1883 static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1884 {
1885 struct cxgbi_device *cdev = csk->cdev;
1886 int must_send;
1887 u32 credits;
1888
1889 log_debug(1 << CXGBI_DBG_PDU_RX,
1890 "csk 0x%p,%u,0x%lx,%u, seq %u, wup %u, thre %u, %u.\n",
1891 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1892 csk->rcv_wup, cdev->rx_credit_thres,
1893 csk->rcv_win);
1894
1895 if (csk->state != CTP_ESTABLISHED)
1896 return;
1897
1898 credits = csk->copied_seq - csk->rcv_wup;
1899 if (unlikely(!credits))
1900 return;
1901 if (unlikely(cdev->rx_credit_thres == 0))
1902 return;
1903
1904 must_send = credits + 16384 >= csk->rcv_win;
1905 if (must_send || credits >= cdev->rx_credit_thres)
1906 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1907 }
1908
1909 void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1910 {
1911 struct cxgbi_device *cdev = csk->cdev;
1912 struct iscsi_conn *conn = csk->user_data;
1913 struct sk_buff *skb;
1914 unsigned int read = 0;
1915 int err = 0;
1916
1917 log_debug(1 << CXGBI_DBG_PDU_RX,
1918 "csk 0x%p, conn 0x%p.\n", csk, conn);
1919
1920 if (unlikely(!conn || conn->suspend_rx)) {
1921 log_debug(1 << CXGBI_DBG_PDU_RX,
1922 "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1923 csk, conn, conn ? conn->id : 0xFF,
1924 conn ? conn->suspend_rx : 0xFF);
1925 return;
1926 }
1927
1928 while (!err) {
1929 skb = skb_peek(&csk->receive_queue);
1930 if (!skb ||
1931 !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1932 if (skb)
1933 log_debug(1 << CXGBI_DBG_PDU_RX,
1934 "skb 0x%p, NOT ready 0x%lx.\n",
1935 skb, cxgbi_skcb_flags(skb));
1936 break;
1937 }
1938 __skb_unlink(skb, &csk->receive_queue);
1939
1940 read += cxgbi_skcb_rx_pdulen(skb);
1941 log_debug(1 << CXGBI_DBG_PDU_RX,
1942 "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1943 csk, skb, skb->len, cxgbi_skcb_flags(skb),
1944 cxgbi_skcb_rx_pdulen(skb));
1945
1946 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1947 err = skb_read_pdu_bhs(conn, skb);
1948 if (err < 0) {
1949 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1950 "f 0x%lx, plen %u.\n",
1951 csk, skb, skb->len,
1952 cxgbi_skcb_flags(skb),
1953 cxgbi_skcb_rx_pdulen(skb));
1954 goto skb_done;
1955 }
1956 err = skb_read_pdu_data(conn, skb, skb,
1957 err + cdev->skb_rx_extra);
1958 if (err < 0)
1959 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1960 "f 0x%lx, plen %u.\n",
1961 csk, skb, skb->len,
1962 cxgbi_skcb_flags(skb),
1963 cxgbi_skcb_rx_pdulen(skb));
1964 } else {
1965 err = skb_read_pdu_bhs(conn, skb);
1966 if (err < 0) {
1967 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1968 "f 0x%lx, plen %u.\n",
1969 csk, skb, skb->len,
1970 cxgbi_skcb_flags(skb),
1971 cxgbi_skcb_rx_pdulen(skb));
1972 goto skb_done;
1973 }
1974
1975 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1976 struct sk_buff *dskb;
1977
1978 dskb = skb_peek(&csk->receive_queue);
1979 if (!dskb) {
1980 pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1981 " plen %u, NO data.\n",
1982 csk, skb, skb->len,
1983 cxgbi_skcb_flags(skb),
1984 cxgbi_skcb_rx_pdulen(skb));
1985 err = -EIO;
1986 goto skb_done;
1987 }
1988 __skb_unlink(dskb, &csk->receive_queue);
1989
1990 err = skb_read_pdu_data(conn, skb, dskb, 0);
1991 if (err < 0)
1992 pr_err("data, csk 0x%p, skb 0x%p,%u, "
1993 "f 0x%lx, plen %u, dskb 0x%p,"
1994 "%u.\n",
1995 csk, skb, skb->len,
1996 cxgbi_skcb_flags(skb),
1997 cxgbi_skcb_rx_pdulen(skb),
1998 dskb, dskb->len);
1999 __kfree_skb(dskb);
2000 } else
2001 err = skb_read_pdu_data(conn, skb, skb, 0);
2002 }
2003 skb_done:
2004 __kfree_skb(skb);
2005
2006 if (err < 0)
2007 break;
2008 }
2009
2010 log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
2011 if (read) {
2012 csk->copied_seq += read;
2013 csk_return_rx_credits(csk, read);
2014 conn->rxdata_octets += read;
2015 }
2016
2017 if (err < 0) {
2018 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
2019 csk, conn, err, read);
2020 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
2021 }
2022 }
2023 EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
2024
2025 static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
2026 unsigned int offset, unsigned int *off,
2027 struct scatterlist **sgp)
2028 {
2029 int i;
2030 struct scatterlist *sg;
2031
2032 for_each_sg(sgl, sg, sgcnt, i) {
2033 if (offset < sg->length) {
2034 *off = offset;
2035 *sgp = sg;
2036 return 0;
2037 }
2038 offset -= sg->length;
2039 }
2040 return -EFAULT;
2041 }
2042
2043 static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
2044 unsigned int dlen, struct page_frag *frags,
2045 int frag_max)
2046 {
2047 unsigned int datalen = dlen;
2048 unsigned int sglen = sg->length - sgoffset;
2049 struct page *page = sg_page(sg);
2050 int i;
2051
2052 i = 0;
2053 do {
2054 unsigned int copy;
2055
2056 if (!sglen) {
2057 sg = sg_next(sg);
2058 if (!sg) {
2059 pr_warn("sg %d NULL, len %u/%u.\n",
2060 i, datalen, dlen);
2061 return -EINVAL;
2062 }
2063 sgoffset = 0;
2064 sglen = sg->length;
2065 page = sg_page(sg);
2066
2067 }
2068 copy = min(datalen, sglen);
2069 if (i && page == frags[i - 1].page &&
2070 sgoffset + sg->offset ==
2071 frags[i - 1].offset + frags[i - 1].size) {
2072 frags[i - 1].size += copy;
2073 } else {
2074 if (i >= frag_max) {
2075 pr_warn("too many pages %u, dlen %u.\n",
2076 frag_max, dlen);
2077 return -EINVAL;
2078 }
2079
2080 frags[i].page = page;
2081 frags[i].offset = sg->offset + sgoffset;
2082 frags[i].size = copy;
2083 i++;
2084 }
2085 datalen -= copy;
2086 sgoffset += copy;
2087 sglen -= copy;
2088 } while (datalen);
2089
2090 return i;
2091 }
2092
2093 int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
2094 {
2095 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2096 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2097 struct cxgbi_device *cdev = cconn->chba->cdev;
2098 struct iscsi_conn *conn = task->conn;
2099 struct iscsi_tcp_task *tcp_task = task->dd_data;
2100 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2101 struct scsi_cmnd *sc = task->sc;
2102 int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
2103
2104 tcp_task->dd_data = tdata;
2105 task->hdr = NULL;
2106
2107 if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
2108 (opcode == ISCSI_OP_SCSI_DATA_OUT ||
2109 (opcode == ISCSI_OP_SCSI_CMD &&
2110 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
2111 /* data could goes into skb head */
2112 headroom += min_t(unsigned int,
2113 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
2114 conn->max_xmit_dlength);
2115
2116 tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
2117 if (!tdata->skb) {
2118 struct cxgbi_sock *csk = cconn->cep->csk;
2119 struct net_device *ndev = cdev->ports[csk->port_id];
2120 ndev->stats.tx_dropped++;
2121 return -ENOMEM;
2122 }
2123
2124 skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
2125 task->hdr = (struct iscsi_hdr *)tdata->skb->data;
2126 task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
2127
2128 /* data_out uses scsi_cmd's itt */
2129 if (opcode != ISCSI_OP_SCSI_DATA_OUT)
2130 task_reserve_itt(task, &task->hdr->itt);
2131
2132 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2133 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
2134 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
2135 conn->max_xmit_dlength, ntohl(task->hdr->itt));
2136
2137 return 0;
2138 }
2139 EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
2140
2141 static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
2142 {
2143 if (hcrc || dcrc) {
2144 u8 submode = 0;
2145
2146 if (hcrc)
2147 submode |= 1;
2148 if (dcrc)
2149 submode |= 2;
2150 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
2151 } else
2152 cxgbi_skcb_ulp_mode(skb) = 0;
2153 }
2154
2155 int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
2156 unsigned int count)
2157 {
2158 struct iscsi_conn *conn = task->conn;
2159 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2160 struct sk_buff *skb = tdata->skb;
2161 unsigned int datalen = count;
2162 int i, padlen = iscsi_padding(count);
2163 struct page *pg;
2164
2165 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2166 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
2167 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
2168 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
2169
2170 skb_put(skb, task->hdr_len);
2171 tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
2172 if (!count)
2173 return 0;
2174
2175 if (task->sc) {
2176 struct scsi_data_buffer *sdb = scsi_out(task->sc);
2177 struct scatterlist *sg = NULL;
2178 int err;
2179
2180 tdata->offset = offset;
2181 tdata->count = count;
2182 err = sgl_seek_offset(
2183 sdb->table.sgl, sdb->table.nents,
2184 tdata->offset, &tdata->sgoffset, &sg);
2185 if (err < 0) {
2186 pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
2187 sdb->table.nents, tdata->offset, sdb->length);
2188 return err;
2189 }
2190 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
2191 tdata->frags, MAX_PDU_FRAGS);
2192 if (err < 0) {
2193 pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
2194 sdb->table.nents, tdata->offset, tdata->count);
2195 return err;
2196 }
2197 tdata->nr_frags = err;
2198
2199 if (tdata->nr_frags > MAX_SKB_FRAGS ||
2200 (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
2201 char *dst = skb->data + task->hdr_len;
2202 struct page_frag *frag = tdata->frags;
2203
2204 /* data fits in the skb's headroom */
2205 for (i = 0; i < tdata->nr_frags; i++, frag++) {
2206 char *src = kmap_atomic(frag->page);
2207
2208 memcpy(dst, src+frag->offset, frag->size);
2209 dst += frag->size;
2210 kunmap_atomic(src);
2211 }
2212 if (padlen) {
2213 memset(dst, 0, padlen);
2214 padlen = 0;
2215 }
2216 skb_put(skb, count + padlen);
2217 } else {
2218 /* data fit into frag_list */
2219 for (i = 0; i < tdata->nr_frags; i++) {
2220 __skb_fill_page_desc(skb, i,
2221 tdata->frags[i].page,
2222 tdata->frags[i].offset,
2223 tdata->frags[i].size);
2224 skb_frag_ref(skb, i);
2225 }
2226 skb_shinfo(skb)->nr_frags = tdata->nr_frags;
2227 skb->len += count;
2228 skb->data_len += count;
2229 skb->truesize += count;
2230 }
2231
2232 } else {
2233 pg = virt_to_page(task->data);
2234
2235 get_page(pg);
2236 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
2237 count);
2238 skb->len += count;
2239 skb->data_len += count;
2240 skb->truesize += count;
2241 }
2242
2243 if (padlen) {
2244 i = skb_shinfo(skb)->nr_frags;
2245 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
2246 virt_to_page(padding), offset_in_page(padding),
2247 padlen);
2248
2249 skb->data_len += padlen;
2250 skb->truesize += padlen;
2251 skb->len += padlen;
2252 }
2253
2254 return 0;
2255 }
2256 EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
2257
2258 int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2259 {
2260 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2261 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2262 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2263 struct sk_buff *skb = tdata->skb;
2264 unsigned int datalen;
2265 int err;
2266
2267 if (!skb) {
2268 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2269 "task 0x%p, skb NULL.\n", task);
2270 return 0;
2271 }
2272
2273 datalen = skb->data_len;
2274 tdata->skb = NULL;
2275 err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2276 if (err > 0) {
2277 int pdulen = err;
2278
2279 log_debug(1 << CXGBI_DBG_PDU_TX,
2280 "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2281 task, task->sc, skb, skb->len, skb->data_len, err);
2282
2283 if (task->conn->hdrdgst_en)
2284 pdulen += ISCSI_DIGEST_SIZE;
2285
2286 if (datalen && task->conn->datadgst_en)
2287 pdulen += ISCSI_DIGEST_SIZE;
2288
2289 task->conn->txdata_octets += pdulen;
2290 return 0;
2291 }
2292
2293 if (err == -EAGAIN || err == -ENOBUFS) {
2294 log_debug(1 << CXGBI_DBG_PDU_TX,
2295 "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2296 task, skb, skb->len, skb->data_len, err);
2297 /* reset skb to send when we are called again */
2298 tdata->skb = skb;
2299 return err;
2300 }
2301
2302 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2303 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2304 task->itt, skb, skb->len, skb->data_len, err);
2305
2306 kfree_skb(skb);
2307
2308 iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2309 iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2310 return err;
2311 }
2312 EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2313
2314 void cxgbi_cleanup_task(struct iscsi_task *task)
2315 {
2316 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2317
2318 log_debug(1 << CXGBI_DBG_ISCSI,
2319 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2320 task, tdata->skb, task->hdr_itt);
2321
2322 /* never reached the xmit task callout */
2323 if (tdata->skb)
2324 __kfree_skb(tdata->skb);
2325 memset(tdata, 0, sizeof(*tdata));
2326
2327 task_release_itt(task, task->hdr_itt);
2328 iscsi_tcp_cleanup_task(task);
2329 }
2330 EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2331
2332 void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2333 struct iscsi_stats *stats)
2334 {
2335 struct iscsi_conn *conn = cls_conn->dd_data;
2336
2337 stats->txdata_octets = conn->txdata_octets;
2338 stats->rxdata_octets = conn->rxdata_octets;
2339 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2340 stats->dataout_pdus = conn->dataout_pdus_cnt;
2341 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2342 stats->datain_pdus = conn->datain_pdus_cnt;
2343 stats->r2t_pdus = conn->r2t_pdus_cnt;
2344 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2345 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2346 stats->digest_err = 0;
2347 stats->timeout_err = 0;
2348 stats->custom_length = 1;
2349 strcpy(stats->custom[0].desc, "eh_abort_cnt");
2350 stats->custom[0].value = conn->eh_abort_cnt;
2351 }
2352 EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2353
2354 static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2355 {
2356 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2357 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2358 struct cxgbi_device *cdev = cconn->chba->cdev;
2359 unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2360 unsigned int max_def = 512 * MAX_SKB_FRAGS;
2361 unsigned int max = max(max_def, headroom);
2362
2363 max = min(cconn->chba->cdev->tx_max_size, max);
2364 if (conn->max_xmit_dlength)
2365 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2366 else
2367 conn->max_xmit_dlength = max;
2368 cxgbi_align_pdu_size(conn->max_xmit_dlength);
2369
2370 return 0;
2371 }
2372
2373 static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2374 {
2375 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2376 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2377 unsigned int max = cconn->chba->cdev->rx_max_size;
2378
2379 cxgbi_align_pdu_size(max);
2380
2381 if (conn->max_recv_dlength) {
2382 if (conn->max_recv_dlength > max) {
2383 pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2384 conn->max_recv_dlength, max);
2385 return -EINVAL;
2386 }
2387 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2388 cxgbi_align_pdu_size(conn->max_recv_dlength);
2389 } else
2390 conn->max_recv_dlength = max;
2391
2392 return 0;
2393 }
2394
2395 int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2396 enum iscsi_param param, char *buf, int buflen)
2397 {
2398 struct iscsi_conn *conn = cls_conn->dd_data;
2399 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2400 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2401 struct cxgbi_sock *csk = cconn->cep->csk;
2402 int err;
2403
2404 log_debug(1 << CXGBI_DBG_ISCSI,
2405 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2406 cls_conn, param, buflen, buf);
2407
2408 switch (param) {
2409 case ISCSI_PARAM_HDRDGST_EN:
2410 err = iscsi_set_param(cls_conn, param, buf, buflen);
2411 if (!err && conn->hdrdgst_en)
2412 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2413 conn->hdrdgst_en,
2414 conn->datadgst_en, 0);
2415 break;
2416 case ISCSI_PARAM_DATADGST_EN:
2417 err = iscsi_set_param(cls_conn, param, buf, buflen);
2418 if (!err && conn->datadgst_en)
2419 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2420 conn->hdrdgst_en,
2421 conn->datadgst_en, 0);
2422 break;
2423 case ISCSI_PARAM_MAX_R2T:
2424 return iscsi_tcp_set_max_r2t(conn, buf);
2425 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2426 err = iscsi_set_param(cls_conn, param, buf, buflen);
2427 if (!err)
2428 err = cxgbi_conn_max_recv_dlength(conn);
2429 break;
2430 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2431 err = iscsi_set_param(cls_conn, param, buf, buflen);
2432 if (!err)
2433 err = cxgbi_conn_max_xmit_dlength(conn);
2434 break;
2435 default:
2436 return iscsi_set_param(cls_conn, param, buf, buflen);
2437 }
2438 return err;
2439 }
2440 EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2441
2442 static inline int csk_print_port(struct cxgbi_sock *csk, char *buf)
2443 {
2444 int len;
2445
2446 cxgbi_sock_get(csk);
2447 len = sprintf(buf, "%hu\n", ntohs(csk->daddr.sin_port));
2448 cxgbi_sock_put(csk);
2449
2450 return len;
2451 }
2452
2453 static inline int csk_print_ip(struct cxgbi_sock *csk, char *buf)
2454 {
2455 int len;
2456
2457 cxgbi_sock_get(csk);
2458 if (csk->csk_family == AF_INET)
2459 len = sprintf(buf, "%pI4",
2460 &csk->daddr.sin_addr.s_addr);
2461 else
2462 len = sprintf(buf, "%pI6",
2463 &csk->daddr6.sin6_addr);
2464
2465 cxgbi_sock_put(csk);
2466
2467 return len;
2468 }
2469
2470 int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2471 char *buf)
2472 {
2473 struct cxgbi_endpoint *cep = ep->dd_data;
2474 struct cxgbi_sock *csk;
2475 int len;
2476
2477 log_debug(1 << CXGBI_DBG_ISCSI,
2478 "cls_conn 0x%p, param %d.\n", ep, param);
2479
2480 switch (param) {
2481 case ISCSI_PARAM_CONN_PORT:
2482 case ISCSI_PARAM_CONN_ADDRESS:
2483 if (!cep)
2484 return -ENOTCONN;
2485
2486 csk = cep->csk;
2487 if (!csk)
2488 return -ENOTCONN;
2489
2490 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2491 &csk->daddr, param, buf);
2492 default:
2493 return -ENOSYS;
2494 }
2495 return len;
2496 }
2497 EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
2498
2499 struct iscsi_cls_conn *
2500 cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2501 {
2502 struct iscsi_cls_conn *cls_conn;
2503 struct iscsi_conn *conn;
2504 struct iscsi_tcp_conn *tcp_conn;
2505 struct cxgbi_conn *cconn;
2506
2507 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2508 if (!cls_conn)
2509 return NULL;
2510
2511 conn = cls_conn->dd_data;
2512 tcp_conn = conn->dd_data;
2513 cconn = tcp_conn->dd_data;
2514 cconn->iconn = conn;
2515
2516 log_debug(1 << CXGBI_DBG_ISCSI,
2517 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2518 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2519
2520 return cls_conn;
2521 }
2522 EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2523
2524 int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2525 struct iscsi_cls_conn *cls_conn,
2526 u64 transport_eph, int is_leading)
2527 {
2528 struct iscsi_conn *conn = cls_conn->dd_data;
2529 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2530 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2531 struct iscsi_endpoint *ep;
2532 struct cxgbi_endpoint *cep;
2533 struct cxgbi_sock *csk;
2534 int err;
2535
2536 ep = iscsi_lookup_endpoint(transport_eph);
2537 if (!ep)
2538 return -EINVAL;
2539
2540 /* setup ddp pagesize */
2541 cep = ep->dd_data;
2542 csk = cep->csk;
2543 err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid, page_idx, 0);
2544 if (err < 0)
2545 return err;
2546
2547 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2548 if (err)
2549 return -EINVAL;
2550
2551 /* calculate the tag idx bits needed for this conn based on cmds_max */
2552 cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2553
2554 write_lock_bh(&csk->callback_lock);
2555 csk->user_data = conn;
2556 cconn->chba = cep->chba;
2557 cconn->cep = cep;
2558 cep->cconn = cconn;
2559 write_unlock_bh(&csk->callback_lock);
2560
2561 cxgbi_conn_max_xmit_dlength(conn);
2562 cxgbi_conn_max_recv_dlength(conn);
2563
2564 log_debug(1 << CXGBI_DBG_ISCSI,
2565 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2566 cls_session, cls_conn, ep, cconn, csk);
2567 /* init recv engine */
2568 iscsi_tcp_hdr_recv_prep(tcp_conn);
2569
2570 return 0;
2571 }
2572 EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2573
2574 struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2575 u16 cmds_max, u16 qdepth,
2576 u32 initial_cmdsn)
2577 {
2578 struct cxgbi_endpoint *cep;
2579 struct cxgbi_hba *chba;
2580 struct Scsi_Host *shost;
2581 struct iscsi_cls_session *cls_session;
2582 struct iscsi_session *session;
2583
2584 if (!ep) {
2585 pr_err("missing endpoint.\n");
2586 return NULL;
2587 }
2588
2589 cep = ep->dd_data;
2590 chba = cep->chba;
2591 shost = chba->shost;
2592
2593 BUG_ON(chba != iscsi_host_priv(shost));
2594
2595 cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2596 cmds_max, 0,
2597 sizeof(struct iscsi_tcp_task) +
2598 sizeof(struct cxgbi_task_data),
2599 initial_cmdsn, ISCSI_MAX_TARGET);
2600 if (!cls_session)
2601 return NULL;
2602
2603 session = cls_session->dd_data;
2604 if (iscsi_tcp_r2tpool_alloc(session))
2605 goto remove_session;
2606
2607 log_debug(1 << CXGBI_DBG_ISCSI,
2608 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2609 return cls_session;
2610
2611 remove_session:
2612 iscsi_session_teardown(cls_session);
2613 return NULL;
2614 }
2615 EXPORT_SYMBOL_GPL(cxgbi_create_session);
2616
2617 void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2618 {
2619 log_debug(1 << CXGBI_DBG_ISCSI,
2620 "cls sess 0x%p.\n", cls_session);
2621
2622 iscsi_tcp_r2tpool_free(cls_session->dd_data);
2623 iscsi_session_teardown(cls_session);
2624 }
2625 EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2626
2627 int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2628 char *buf, int buflen)
2629 {
2630 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2631
2632 if (!chba->ndev) {
2633 shost_printk(KERN_ERR, shost, "Could not get host param. "
2634 "netdev for host not set.\n");
2635 return -ENODEV;
2636 }
2637
2638 log_debug(1 << CXGBI_DBG_ISCSI,
2639 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2640 shost, chba, chba->ndev->name, param, buflen, buf);
2641
2642 switch (param) {
2643 case ISCSI_HOST_PARAM_IPADDRESS:
2644 {
2645 __be32 addr = in_aton(buf);
2646 log_debug(1 << CXGBI_DBG_ISCSI,
2647 "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2648 cxgbi_set_iscsi_ipv4(chba, addr);
2649 return 0;
2650 }
2651 case ISCSI_HOST_PARAM_HWADDRESS:
2652 case ISCSI_HOST_PARAM_NETDEV_NAME:
2653 return 0;
2654 default:
2655 return iscsi_host_set_param(shost, param, buf, buflen);
2656 }
2657 }
2658 EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2659
2660 int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2661 char *buf)
2662 {
2663 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2664 int len = 0;
2665
2666 if (!chba->ndev) {
2667 shost_printk(KERN_ERR, shost, "Could not get host param. "
2668 "netdev for host not set.\n");
2669 return -ENODEV;
2670 }
2671
2672 log_debug(1 << CXGBI_DBG_ISCSI,
2673 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2674 shost, chba, chba->ndev->name, param);
2675
2676 switch (param) {
2677 case ISCSI_HOST_PARAM_HWADDRESS:
2678 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2679 break;
2680 case ISCSI_HOST_PARAM_NETDEV_NAME:
2681 len = sprintf(buf, "%s\n", chba->ndev->name);
2682 break;
2683 case ISCSI_HOST_PARAM_IPADDRESS:
2684 {
2685 struct cxgbi_sock *csk = find_sock_on_port(chba->cdev,
2686 chba->port_id);
2687 if (csk) {
2688 len = sprintf(buf, "%pIS",
2689 (struct sockaddr *)&csk->saddr);
2690 }
2691 log_debug(1 << CXGBI_DBG_ISCSI,
2692 "hba %s, addr %s.\n", chba->ndev->name, buf);
2693 break;
2694 }
2695 default:
2696 return iscsi_host_get_param(shost, param, buf);
2697 }
2698
2699 return len;
2700 }
2701 EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2702
2703 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2704 struct sockaddr *dst_addr,
2705 int non_blocking)
2706 {
2707 struct iscsi_endpoint *ep;
2708 struct cxgbi_endpoint *cep;
2709 struct cxgbi_hba *hba = NULL;
2710 struct cxgbi_sock *csk;
2711 int err = -EINVAL;
2712
2713 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2714 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2715 shost, non_blocking, dst_addr);
2716
2717 if (shost) {
2718 hba = iscsi_host_priv(shost);
2719 if (!hba) {
2720 pr_info("shost 0x%p, priv NULL.\n", shost);
2721 goto err_out;
2722 }
2723 }
2724
2725 if (dst_addr->sa_family == AF_INET) {
2726 csk = cxgbi_check_route(dst_addr);
2727 #if IS_ENABLED(CONFIG_IPV6)
2728 } else if (dst_addr->sa_family == AF_INET6) {
2729 csk = cxgbi_check_route6(dst_addr);
2730 #endif
2731 } else {
2732 pr_info("address family 0x%x NOT supported.\n",
2733 dst_addr->sa_family);
2734 err = -EAFNOSUPPORT;
2735 return (struct iscsi_endpoint *)ERR_PTR(err);
2736 }
2737
2738 if (IS_ERR(csk))
2739 return (struct iscsi_endpoint *)csk;
2740 cxgbi_sock_get(csk);
2741
2742 if (!hba)
2743 hba = csk->cdev->hbas[csk->port_id];
2744 else if (hba != csk->cdev->hbas[csk->port_id]) {
2745 pr_info("Could not connect through requested host %u"
2746 "hba 0x%p != 0x%p (%u).\n",
2747 shost->host_no, hba,
2748 csk->cdev->hbas[csk->port_id], csk->port_id);
2749 err = -ENOSPC;
2750 goto release_conn;
2751 }
2752
2753 err = sock_get_port(csk);
2754 if (err)
2755 goto release_conn;
2756
2757 cxgbi_sock_set_state(csk, CTP_CONNECTING);
2758 err = csk->cdev->csk_init_act_open(csk);
2759 if (err)
2760 goto release_conn;
2761
2762 if (cxgbi_sock_is_closing(csk)) {
2763 err = -ENOSPC;
2764 pr_info("csk 0x%p is closing.\n", csk);
2765 goto release_conn;
2766 }
2767
2768 ep = iscsi_create_endpoint(sizeof(*cep));
2769 if (!ep) {
2770 err = -ENOMEM;
2771 pr_info("iscsi alloc ep, OOM.\n");
2772 goto release_conn;
2773 }
2774
2775 cep = ep->dd_data;
2776 cep->csk = csk;
2777 cep->chba = hba;
2778
2779 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2780 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2781 ep, cep, csk, hba, hba->ndev->name);
2782 return ep;
2783
2784 release_conn:
2785 cxgbi_sock_put(csk);
2786 cxgbi_sock_closed(csk);
2787 err_out:
2788 return ERR_PTR(err);
2789 }
2790 EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2791
2792 int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2793 {
2794 struct cxgbi_endpoint *cep = ep->dd_data;
2795 struct cxgbi_sock *csk = cep->csk;
2796
2797 if (!cxgbi_sock_is_established(csk))
2798 return 0;
2799 return 1;
2800 }
2801 EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2802
2803 void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2804 {
2805 struct cxgbi_endpoint *cep = ep->dd_data;
2806 struct cxgbi_conn *cconn = cep->cconn;
2807 struct cxgbi_sock *csk = cep->csk;
2808
2809 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2810 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2811 ep, cep, cconn, csk, csk->state, csk->flags);
2812
2813 if (cconn && cconn->iconn) {
2814 iscsi_suspend_tx(cconn->iconn);
2815 write_lock_bh(&csk->callback_lock);
2816 cep->csk->user_data = NULL;
2817 cconn->cep = NULL;
2818 write_unlock_bh(&csk->callback_lock);
2819 }
2820 iscsi_destroy_endpoint(ep);
2821
2822 if (likely(csk->state >= CTP_ESTABLISHED))
2823 need_active_close(csk);
2824 else
2825 cxgbi_sock_closed(csk);
2826
2827 cxgbi_sock_put(csk);
2828 }
2829 EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2830
2831 int cxgbi_iscsi_init(struct iscsi_transport *itp,
2832 struct scsi_transport_template **stt)
2833 {
2834 *stt = iscsi_register_transport(itp);
2835 if (*stt == NULL) {
2836 pr_err("unable to register %s transport 0x%p.\n",
2837 itp->name, itp);
2838 return -ENODEV;
2839 }
2840 log_debug(1 << CXGBI_DBG_ISCSI,
2841 "%s, registered iscsi transport 0x%p.\n",
2842 itp->name, stt);
2843 return 0;
2844 }
2845 EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2846
2847 void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2848 struct scsi_transport_template **stt)
2849 {
2850 if (*stt) {
2851 log_debug(1 << CXGBI_DBG_ISCSI,
2852 "de-register transport 0x%p, %s, stt 0x%p.\n",
2853 itp, itp->name, *stt);
2854 *stt = NULL;
2855 iscsi_unregister_transport(itp);
2856 }
2857 }
2858 EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2859
2860 umode_t cxgbi_attr_is_visible(int param_type, int param)
2861 {
2862 switch (param_type) {
2863 case ISCSI_HOST_PARAM:
2864 switch (param) {
2865 case ISCSI_HOST_PARAM_NETDEV_NAME:
2866 case ISCSI_HOST_PARAM_HWADDRESS:
2867 case ISCSI_HOST_PARAM_IPADDRESS:
2868 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2869 return S_IRUGO;
2870 default:
2871 return 0;
2872 }
2873 case ISCSI_PARAM:
2874 switch (param) {
2875 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2876 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2877 case ISCSI_PARAM_HDRDGST_EN:
2878 case ISCSI_PARAM_DATADGST_EN:
2879 case ISCSI_PARAM_CONN_ADDRESS:
2880 case ISCSI_PARAM_CONN_PORT:
2881 case ISCSI_PARAM_EXP_STATSN:
2882 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2883 case ISCSI_PARAM_PERSISTENT_PORT:
2884 case ISCSI_PARAM_PING_TMO:
2885 case ISCSI_PARAM_RECV_TMO:
2886 case ISCSI_PARAM_INITIAL_R2T_EN:
2887 case ISCSI_PARAM_MAX_R2T:
2888 case ISCSI_PARAM_IMM_DATA_EN:
2889 case ISCSI_PARAM_FIRST_BURST:
2890 case ISCSI_PARAM_MAX_BURST:
2891 case ISCSI_PARAM_PDU_INORDER_EN:
2892 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2893 case ISCSI_PARAM_ERL:
2894 case ISCSI_PARAM_TARGET_NAME:
2895 case ISCSI_PARAM_TPGT:
2896 case ISCSI_PARAM_USERNAME:
2897 case ISCSI_PARAM_PASSWORD:
2898 case ISCSI_PARAM_USERNAME_IN:
2899 case ISCSI_PARAM_PASSWORD_IN:
2900 case ISCSI_PARAM_FAST_ABORT:
2901 case ISCSI_PARAM_ABORT_TMO:
2902 case ISCSI_PARAM_LU_RESET_TMO:
2903 case ISCSI_PARAM_TGT_RESET_TMO:
2904 case ISCSI_PARAM_IFACE_NAME:
2905 case ISCSI_PARAM_INITIATOR_NAME:
2906 return S_IRUGO;
2907 default:
2908 return 0;
2909 }
2910 }
2911
2912 return 0;
2913 }
2914 EXPORT_SYMBOL_GPL(cxgbi_attr_is_visible);
2915
2916 static int __init libcxgbi_init_module(void)
2917 {
2918 sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
2919 sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
2920
2921 pr_info("%s", version);
2922
2923 pr_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
2924 ISCSI_ITT_MASK, sw_tag_idx_bits,
2925 ISCSI_AGE_MASK, sw_tag_age_bits);
2926
2927 ddp_setup_host_page_size();
2928 return 0;
2929 }
2930
2931 static void __exit libcxgbi_exit_module(void)
2932 {
2933 cxgbi_device_unregister_all(0xFF);
2934 return;
2935 }
2936
2937 module_init(libcxgbi_init_module);
2938 module_exit(libcxgbi_exit_module);
Linux kernel - Deliverables
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