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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / scsi / cxgbi / libcxgbi.c
blob4bc794d2f51c96dd5da708d8c5ef10dcbd14978d
1 /*
2 * libcxgbi.c: Chelsio common library for T3/T4 iSCSI driver.
3 *
4 * Copyright (c) 2010-2015 Chelsio Communications, Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation.
9 *
10 * Written by: Karen Xie (kxie@chelsio.com)
11 * Written by: Rakesh Ranjan (rranjan@chelsio.com)
12 */
13
14 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
15
16 #include <linux/skbuff.h>
17 #include <linux/crypto.h>
18 #include <linux/scatterlist.h>
19 #include <linux/pci.h>
20 #include <scsi/scsi.h>
21 #include <scsi/scsi_cmnd.h>
22 #include <scsi/scsi_host.h>
23 #include <linux/if_vlan.h>
24 #include <linux/inet.h>
25 #include <net/dst.h>
26 #include <net/route.h>
27 #include <net/ipv6.h>
28 #include <net/ip6_route.h>
29 #include <net/addrconf.h>
30
31 #include <linux/inetdevice.h> /* ip_dev_find */
32 #include <linux/module.h>
33 #include <net/tcp.h>
34
35 static unsigned int dbg_level;
36
37 #include "libcxgbi.h"
38
39 #define DRV_MODULE_NAME "libcxgbi"
40 #define DRV_MODULE_DESC "Chelsio iSCSI driver library"
41 #define DRV_MODULE_VERSION "0.9.1-ko"
42 #define DRV_MODULE_RELDATE "Apr. 2015"
43
44 static char version[] =
45 DRV_MODULE_DESC " " DRV_MODULE_NAME
46 " v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
47
48 MODULE_AUTHOR("Chelsio Communications, Inc.");
49 MODULE_DESCRIPTION(DRV_MODULE_DESC);
50 MODULE_VERSION(DRV_MODULE_VERSION);
51 MODULE_LICENSE("GPL");
52
53 module_param(dbg_level, uint, 0644);
54 MODULE_PARM_DESC(dbg_level, "libiscsi debug level (default=0)");
55
56
57 /*
58 * cxgbi device management
59 * maintains a list of the cxgbi devices
60 */
61 static LIST_HEAD(cdev_list);
62 static DEFINE_MUTEX(cdev_mutex);
63
64 static LIST_HEAD(cdev_rcu_list);
65 static DEFINE_SPINLOCK(cdev_rcu_lock);
66
67 static inline void cxgbi_decode_sw_tag(u32 sw_tag, int *idx, int *age)
68 {
69 if (age)
70 *age = sw_tag & 0x7FFF;
71 if (idx)
72 *idx = (sw_tag >> 16) & 0x7FFF;
73 }
74
75 int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
76 unsigned int max_conn)
77 {
78 struct cxgbi_ports_map *pmap = &cdev->pmap;
79
80 pmap->port_csk = cxgbi_alloc_big_mem(max_conn *
81 sizeof(struct cxgbi_sock *),
82 GFP_KERNEL);
83 if (!pmap->port_csk) {
84 pr_warn("cdev 0x%p, portmap OOM %u.\n", cdev, max_conn);
85 return -ENOMEM;
86 }
87
88 pmap->max_connect = max_conn;
89 pmap->sport_base = base;
90 spin_lock_init(&pmap->lock);
91 return 0;
92 }
93 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_create);
94
95 void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev)
96 {
97 struct cxgbi_ports_map *pmap = &cdev->pmap;
98 struct cxgbi_sock *csk;
99 int i;
100
101 for (i = 0; i < pmap->max_connect; i++) {
102 if (pmap->port_csk[i]) {
103 csk = pmap->port_csk[i];
104 pmap->port_csk[i] = NULL;
105 log_debug(1 << CXGBI_DBG_SOCK,
106 "csk 0x%p, cdev 0x%p, offload down.\n",
107 csk, cdev);
108 spin_lock_bh(&csk->lock);
109 cxgbi_sock_set_flag(csk, CTPF_OFFLOAD_DOWN);
110 cxgbi_sock_closed(csk);
111 spin_unlock_bh(&csk->lock);
112 cxgbi_sock_put(csk);
113 }
114 }
115 }
116 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_cleanup);
117
118 static inline void cxgbi_device_destroy(struct cxgbi_device *cdev)
119 {
120 log_debug(1 << CXGBI_DBG_DEV,
121 "cdev 0x%p, p# %u.\n", cdev, cdev->nports);
122 cxgbi_hbas_remove(cdev);
123 cxgbi_device_portmap_cleanup(cdev);
124 if (cdev->cdev2ppm)
125 cxgbi_ppm_release(cdev->cdev2ppm(cdev));
126 if (cdev->pmap.max_connect)
127 cxgbi_free_big_mem(cdev->pmap.port_csk);
128 kfree(cdev);
129 }
130
131 struct cxgbi_device *cxgbi_device_register(unsigned int extra,
132 unsigned int nports)
133 {
134 struct cxgbi_device *cdev;
135
136 cdev = kzalloc(sizeof(*cdev) + extra + nports *
137 (sizeof(struct cxgbi_hba *) +
138 sizeof(struct net_device *)),
139 GFP_KERNEL);
140 if (!cdev) {
141 pr_warn("nport %d, OOM.\n", nports);
142 return NULL;
143 }
144 cdev->ports = (struct net_device **)(cdev + 1);
145 cdev->hbas = (struct cxgbi_hba **)(((char*)cdev->ports) + nports *
146 sizeof(struct net_device *));
147 if (extra)
148 cdev->dd_data = ((char *)cdev->hbas) +
149 nports * sizeof(struct cxgbi_hba *);
150 spin_lock_init(&cdev->pmap.lock);
151
152 mutex_lock(&cdev_mutex);
153 list_add_tail(&cdev->list_head, &cdev_list);
154 mutex_unlock(&cdev_mutex);
155
156 spin_lock(&cdev_rcu_lock);
157 list_add_tail_rcu(&cdev->rcu_node, &cdev_rcu_list);
158 spin_unlock(&cdev_rcu_lock);
159
160 log_debug(1 << CXGBI_DBG_DEV,
161 "cdev 0x%p, p# %u.\n", cdev, nports);
162 return cdev;
163 }
164 EXPORT_SYMBOL_GPL(cxgbi_device_register);
165
166 void cxgbi_device_unregister(struct cxgbi_device *cdev)
167 {
168 log_debug(1 << CXGBI_DBG_DEV,
169 "cdev 0x%p, p# %u,%s.\n",
170 cdev, cdev->nports, cdev->nports ? cdev->ports[0]->name : "");
171
172 mutex_lock(&cdev_mutex);
173 list_del(&cdev->list_head);
174 mutex_unlock(&cdev_mutex);
175
176 spin_lock(&cdev_rcu_lock);
177 list_del_rcu(&cdev->rcu_node);
178 spin_unlock(&cdev_rcu_lock);
179 synchronize_rcu();
180
181 cxgbi_device_destroy(cdev);
182 }
183 EXPORT_SYMBOL_GPL(cxgbi_device_unregister);
184
185 void cxgbi_device_unregister_all(unsigned int flag)
186 {
187 struct cxgbi_device *cdev, *tmp;
188
189 mutex_lock(&cdev_mutex);
190 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
191 if ((cdev->flags & flag) == flag) {
192 mutex_unlock(&cdev_mutex);
193 cxgbi_device_unregister(cdev);
194 mutex_lock(&cdev_mutex);
195 }
196 }
197 mutex_unlock(&cdev_mutex);
198 }
199 EXPORT_SYMBOL_GPL(cxgbi_device_unregister_all);
200
201 struct cxgbi_device *cxgbi_device_find_by_lldev(void *lldev)
202 {
203 struct cxgbi_device *cdev, *tmp;
204
205 mutex_lock(&cdev_mutex);
206 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
207 if (cdev->lldev == lldev) {
208 mutex_unlock(&cdev_mutex);
209 return cdev;
210 }
211 }
212 mutex_unlock(&cdev_mutex);
213
214 log_debug(1 << CXGBI_DBG_DEV,
215 "lldev 0x%p, NO match found.\n", lldev);
216 return NULL;
217 }
218 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev);
219
220 struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev,
221 int *port)
222 {
223 struct net_device *vdev = NULL;
224 struct cxgbi_device *cdev, *tmp;
225 int i;
226
227 if (is_vlan_dev(ndev)) {
228 vdev = ndev;
229 ndev = vlan_dev_real_dev(ndev);
230 log_debug(1 << CXGBI_DBG_DEV,
231 "vlan dev %s -> %s.\n", vdev->name, ndev->name);
232 }
233
234 mutex_lock(&cdev_mutex);
235 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
236 for (i = 0; i < cdev->nports; i++) {
237 if (ndev == cdev->ports[i]) {
238 cdev->hbas[i]->vdev = vdev;
239 mutex_unlock(&cdev_mutex);
240 if (port)
241 *port = i;
242 return cdev;
243 }
244 }
245 }
246 mutex_unlock(&cdev_mutex);
247 log_debug(1 << CXGBI_DBG_DEV,
248 "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
249 return NULL;
250 }
251 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev);
252
253 struct cxgbi_device *cxgbi_device_find_by_netdev_rcu(struct net_device *ndev,
254 int *port)
255 {
256 struct net_device *vdev = NULL;
257 struct cxgbi_device *cdev;
258 int i;
259
260 if (is_vlan_dev(ndev)) {
261 vdev = ndev;
262 ndev = vlan_dev_real_dev(ndev);
263 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
264 }
265
266 rcu_read_lock();
267 list_for_each_entry_rcu(cdev, &cdev_rcu_list, rcu_node) {
268 for (i = 0; i < cdev->nports; i++) {
269 if (ndev == cdev->ports[i]) {
270 cdev->hbas[i]->vdev = vdev;
271 rcu_read_unlock();
272 if (port)
273 *port = i;
274 return cdev;
275 }
276 }
277 }
278 rcu_read_unlock();
279
280 log_debug(1 << CXGBI_DBG_DEV,
281 "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
282 return NULL;
283 }
284 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev_rcu);
285
286 static struct cxgbi_device *cxgbi_device_find_by_mac(struct net_device *ndev,
287 int *port)
288 {
289 struct net_device *vdev = NULL;
290 struct cxgbi_device *cdev, *tmp;
291 int i;
292
293 if (is_vlan_dev(ndev)) {
294 vdev = ndev;
295 ndev = vlan_dev_real_dev(ndev);
296 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
297 }
298
299 mutex_lock(&cdev_mutex);
300 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
301 for (i = 0; i < cdev->nports; i++) {
302 if (!memcmp(ndev->dev_addr, cdev->ports[i]->dev_addr,
303 MAX_ADDR_LEN)) {
304 cdev->hbas[i]->vdev = vdev;
305 mutex_unlock(&cdev_mutex);
306 if (port)
307 *port = i;
308 return cdev;
309 }
310 }
311 }
312 mutex_unlock(&cdev_mutex);
313 log_debug(1 << CXGBI_DBG_DEV,
314 "ndev 0x%p, %s, NO match mac found.\n",
315 ndev, ndev->name);
316 return NULL;
317 }
318
319 void cxgbi_hbas_remove(struct cxgbi_device *cdev)
320 {
321 int i;
322 struct cxgbi_hba *chba;
323
324 log_debug(1 << CXGBI_DBG_DEV,
325 "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
326
327 for (i = 0; i < cdev->nports; i++) {
328 chba = cdev->hbas[i];
329 if (chba) {
330 cdev->hbas[i] = NULL;
331 iscsi_host_remove(chba->shost);
332 pci_dev_put(cdev->pdev);
333 iscsi_host_free(chba->shost);
334 }
335 }
336 }
337 EXPORT_SYMBOL_GPL(cxgbi_hbas_remove);
338
339 int cxgbi_hbas_add(struct cxgbi_device *cdev, u64 max_lun,
340 unsigned int max_id, struct scsi_host_template *sht,
341 struct scsi_transport_template *stt)
342 {
343 struct cxgbi_hba *chba;
344 struct Scsi_Host *shost;
345 int i, err;
346
347 log_debug(1 << CXGBI_DBG_DEV, "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
348
349 for (i = 0; i < cdev->nports; i++) {
350 shost = iscsi_host_alloc(sht, sizeof(*chba), 1);
351 if (!shost) {
352 pr_info("0x%p, p%d, %s, host alloc failed.\n",
353 cdev, i, cdev->ports[i]->name);
354 err = -ENOMEM;
355 goto err_out;
356 }
357
358 shost->transportt = stt;
359 shost->max_lun = max_lun;
360 shost->max_id = max_id;
361 shost->max_channel = 0;
362 shost->max_cmd_len = 16;
363
364 chba = iscsi_host_priv(shost);
365 chba->cdev = cdev;
366 chba->ndev = cdev->ports[i];
367 chba->shost = shost;
368
369 log_debug(1 << CXGBI_DBG_DEV,
370 "cdev 0x%p, p#%d %s: chba 0x%p.\n",
371 cdev, i, cdev->ports[i]->name, chba);
372
373 pci_dev_get(cdev->pdev);
374 err = iscsi_host_add(shost, &cdev->pdev->dev);
375 if (err) {
376 pr_info("cdev 0x%p, p#%d %s, host add failed.\n",
377 cdev, i, cdev->ports[i]->name);
378 pci_dev_put(cdev->pdev);
379 scsi_host_put(shost);
380 goto err_out;
381 }
382
383 cdev->hbas[i] = chba;
384 }
385
386 return 0;
387
388 err_out:
389 cxgbi_hbas_remove(cdev);
390 return err;
391 }
392 EXPORT_SYMBOL_GPL(cxgbi_hbas_add);
393
394 /*
395 * iSCSI offload
396 *
397 * - source port management
398 * To find a free source port in the port allocation map we use a very simple
399 * rotor scheme to look for the next free port.
400 *
401 * If a source port has been specified make sure that it doesn't collide with
402 * our normal source port allocation map. If it's outside the range of our
403 * allocation/deallocation scheme just let them use it.
404 *
405 * If the source port is outside our allocation range, the caller is
406 * responsible for keeping track of their port usage.
407 */
408
409 static struct cxgbi_sock *find_sock_on_port(struct cxgbi_device *cdev,
410 unsigned char port_id)
411 {
412 struct cxgbi_ports_map *pmap = &cdev->pmap;
413 unsigned int i;
414 unsigned int used;
415
416 if (!pmap->max_connect || !pmap->used)
417 return NULL;
418
419 spin_lock_bh(&pmap->lock);
420 used = pmap->used;
421 for (i = 0; used && i < pmap->max_connect; i++) {
422 struct cxgbi_sock *csk = pmap->port_csk[i];
423
424 if (csk) {
425 if (csk->port_id == port_id) {
426 spin_unlock_bh(&pmap->lock);
427 return csk;
428 }
429 used--;
430 }
431 }
432 spin_unlock_bh(&pmap->lock);
433
434 return NULL;
435 }
436
437 static int sock_get_port(struct cxgbi_sock *csk)
438 {
439 struct cxgbi_device *cdev = csk->cdev;
440 struct cxgbi_ports_map *pmap = &cdev->pmap;
441 unsigned int start;
442 int idx;
443 __be16 *port;
444
445 if (!pmap->max_connect) {
446 pr_err("cdev 0x%p, p#%u %s, NO port map.\n",
447 cdev, csk->port_id, cdev->ports[csk->port_id]->name);
448 return -EADDRNOTAVAIL;
449 }
450
451 if (csk->csk_family == AF_INET)
452 port = &csk->saddr.sin_port;
453 else /* ipv6 */
454 port = &csk->saddr6.sin6_port;
455
456 if (*port) {
457 pr_err("source port NON-ZERO %u.\n",
458 ntohs(*port));
459 return -EADDRINUSE;
460 }
461
462 spin_lock_bh(&pmap->lock);
463 if (pmap->used >= pmap->max_connect) {
464 spin_unlock_bh(&pmap->lock);
465 pr_info("cdev 0x%p, p#%u %s, ALL ports used.\n",
466 cdev, csk->port_id, cdev->ports[csk->port_id]->name);
467 return -EADDRNOTAVAIL;
468 }
469
470 start = idx = pmap->next;
471 do {
472 if (++idx >= pmap->max_connect)
473 idx = 0;
474 if (!pmap->port_csk[idx]) {
475 pmap->used++;
476 *port = htons(pmap->sport_base + idx);
477 pmap->next = idx;
478 pmap->port_csk[idx] = csk;
479 spin_unlock_bh(&pmap->lock);
480 cxgbi_sock_get(csk);
481 log_debug(1 << CXGBI_DBG_SOCK,
482 "cdev 0x%p, p#%u %s, p %u, %u.\n",
483 cdev, csk->port_id,
484 cdev->ports[csk->port_id]->name,
485 pmap->sport_base + idx, pmap->next);
486 return 0;
487 }
488 } while (idx != start);
489 spin_unlock_bh(&pmap->lock);
490
491 /* should not happen */
492 pr_warn("cdev 0x%p, p#%u %s, next %u?\n",
493 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
494 pmap->next);
495 return -EADDRNOTAVAIL;
496 }
497
498 static void sock_put_port(struct cxgbi_sock *csk)
499 {
500 struct cxgbi_device *cdev = csk->cdev;
501 struct cxgbi_ports_map *pmap = &cdev->pmap;
502 __be16 *port;
503
504 if (csk->csk_family == AF_INET)
505 port = &csk->saddr.sin_port;
506 else /* ipv6 */
507 port = &csk->saddr6.sin6_port;
508
509 if (*port) {
510 int idx = ntohs(*port) - pmap->sport_base;
511
512 *port = 0;
513 if (idx < 0 || idx >= pmap->max_connect) {
514 pr_err("cdev 0x%p, p#%u %s, port %u OOR.\n",
515 cdev, csk->port_id,
516 cdev->ports[csk->port_id]->name,
517 ntohs(*port));
518 return;
519 }
520
521 spin_lock_bh(&pmap->lock);
522 pmap->port_csk[idx] = NULL;
523 pmap->used--;
524 spin_unlock_bh(&pmap->lock);
525
526 log_debug(1 << CXGBI_DBG_SOCK,
527 "cdev 0x%p, p#%u %s, release %u.\n",
528 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
529 pmap->sport_base + idx);
530
531 cxgbi_sock_put(csk);
532 }
533 }
534
535 /*
536 * iscsi tcp connection
537 */
538 void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *csk)
539 {
540 if (csk->cpl_close) {
541 kfree_skb(csk->cpl_close);
542 csk->cpl_close = NULL;
543 }
544 if (csk->cpl_abort_req) {
545 kfree_skb(csk->cpl_abort_req);
546 csk->cpl_abort_req = NULL;
547 }
548 if (csk->cpl_abort_rpl) {
549 kfree_skb(csk->cpl_abort_rpl);
550 csk->cpl_abort_rpl = NULL;
551 }
552 }
553 EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs);
554
555 static struct cxgbi_sock *cxgbi_sock_create(struct cxgbi_device *cdev)
556 {
557 struct cxgbi_sock *csk = kzalloc(sizeof(*csk), GFP_NOIO);
558
559 if (!csk) {
560 pr_info("alloc csk %zu failed.\n", sizeof(*csk));
561 return NULL;
562 }
563
564 if (cdev->csk_alloc_cpls(csk) < 0) {
565 pr_info("csk 0x%p, alloc cpls failed.\n", csk);
566 kfree(csk);
567 return NULL;
568 }
569
570 spin_lock_init(&csk->lock);
571 kref_init(&csk->refcnt);
572 skb_queue_head_init(&csk->receive_queue);
573 skb_queue_head_init(&csk->write_queue);
574 timer_setup(&csk->retry_timer, NULL, 0);
575 init_completion(&csk->cmpl);
576 rwlock_init(&csk->callback_lock);
577 csk->cdev = cdev;
578 csk->flags = 0;
579 cxgbi_sock_set_state(csk, CTP_CLOSED);
580
581 log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk);
582
583 return csk;
584 }
585
586 static struct rtable *find_route_ipv4(struct flowi4 *fl4,
587 __be32 saddr, __be32 daddr,
588 __be16 sport, __be16 dport, u8 tos,
589 int ifindex)
590 {
591 struct rtable *rt;
592
593 rt = ip_route_output_ports(&init_net, fl4, NULL, daddr, saddr,
594 dport, sport, IPPROTO_TCP, tos, ifindex);
595 if (IS_ERR(rt))
596 return NULL;
597
598 return rt;
599 }
600
601 static struct cxgbi_sock *
602 cxgbi_check_route(struct sockaddr *dst_addr, int ifindex)
603 {
604 struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
605 struct dst_entry *dst;
606 struct net_device *ndev;
607 struct cxgbi_device *cdev;
608 struct rtable *rt = NULL;
609 struct neighbour *n;
610 struct flowi4 fl4;
611 struct cxgbi_sock *csk = NULL;
612 unsigned int mtu = 0;
613 int port = 0xFFFF;
614 int err = 0;
615
616 rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0,
617 daddr->sin_port, 0, ifindex);
618 if (!rt) {
619 pr_info("no route to ipv4 0x%x, port %u.\n",
620 be32_to_cpu(daddr->sin_addr.s_addr),
621 be16_to_cpu(daddr->sin_port));
622 err = -ENETUNREACH;
623 goto err_out;
624 }
625 dst = &rt->dst;
626 n = dst_neigh_lookup(dst, &daddr->sin_addr.s_addr);
627 if (!n) {
628 err = -ENODEV;
629 goto rel_rt;
630 }
631 ndev = n->dev;
632
633 if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
634 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
635 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
636 ndev->name);
637 err = -ENETUNREACH;
638 goto rel_neigh;
639 }
640
641 if (ndev->flags & IFF_LOOPBACK) {
642 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
643 if (!ndev) {
644 err = -ENETUNREACH;
645 goto rel_neigh;
646 }
647 mtu = ndev->mtu;
648 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
649 n->dev->name, ndev->name, mtu);
650 }
651
652 if (!(ndev->flags & IFF_UP) || !netif_carrier_ok(ndev)) {
653 pr_info("%s interface not up.\n", ndev->name);
654 err = -ENETDOWN;
655 goto rel_neigh;
656 }
657
658 cdev = cxgbi_device_find_by_netdev(ndev, &port);
659 if (!cdev)
660 cdev = cxgbi_device_find_by_mac(ndev, &port);
661 if (!cdev) {
662 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
663 &daddr->sin_addr.s_addr, ndev->name);
664 err = -ENETUNREACH;
665 goto rel_neigh;
666 }
667 log_debug(1 << CXGBI_DBG_SOCK,
668 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
669 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
670 port, ndev->name, cdev);
671
672 csk = cxgbi_sock_create(cdev);
673 if (!csk) {
674 err = -ENOMEM;
675 goto rel_neigh;
676 }
677 csk->cdev = cdev;
678 csk->port_id = port;
679 csk->mtu = mtu;
680 csk->dst = dst;
681
682 csk->csk_family = AF_INET;
683 csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
684 csk->daddr.sin_port = daddr->sin_port;
685 csk->daddr.sin_family = daddr->sin_family;
686 csk->saddr.sin_family = daddr->sin_family;
687 csk->saddr.sin_addr.s_addr = fl4.saddr;
688 neigh_release(n);
689
690 return csk;
691
692 rel_neigh:
693 neigh_release(n);
694
695 rel_rt:
696 ip_rt_put(rt);
697 err_out:
698 return ERR_PTR(err);
699 }
700
701 #if IS_ENABLED(CONFIG_IPV6)
702 static struct rt6_info *find_route_ipv6(const struct in6_addr *saddr,
703 const struct in6_addr *daddr,
704 int ifindex)
705 {
706 struct flowi6 fl;
707
708 memset(&fl, 0, sizeof(fl));
709 fl.flowi6_oif = ifindex;
710 if (saddr)
711 memcpy(&fl.saddr, saddr, sizeof(struct in6_addr));
712 if (daddr)
713 memcpy(&fl.daddr, daddr, sizeof(struct in6_addr));
714 return (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl);
715 }
716
717 static struct cxgbi_sock *
718 cxgbi_check_route6(struct sockaddr *dst_addr, int ifindex)
719 {
720 struct sockaddr_in6 *daddr6 = (struct sockaddr_in6 *)dst_addr;
721 struct dst_entry *dst;
722 struct net_device *ndev;
723 struct cxgbi_device *cdev;
724 struct rt6_info *rt = NULL;
725 struct neighbour *n;
726 struct in6_addr pref_saddr;
727 struct cxgbi_sock *csk = NULL;
728 unsigned int mtu = 0;
729 int port = 0xFFFF;
730 int err = 0;
731
732 rt = find_route_ipv6(NULL, &daddr6->sin6_addr, ifindex);
733
734 if (!rt) {
735 pr_info("no route to ipv6 %pI6 port %u\n",
736 daddr6->sin6_addr.s6_addr,
737 be16_to_cpu(daddr6->sin6_port));
738 err = -ENETUNREACH;
739 goto err_out;
740 }
741
742 dst = &rt->dst;
743
744 n = dst_neigh_lookup(dst, &daddr6->sin6_addr);
745
746 if (!n) {
747 pr_info("%pI6, port %u, dst no neighbour.\n",
748 daddr6->sin6_addr.s6_addr,
749 be16_to_cpu(daddr6->sin6_port));
750 err = -ENETUNREACH;
751 goto rel_rt;
752 }
753 ndev = n->dev;
754
755 if (!(ndev->flags & IFF_UP) || !netif_carrier_ok(ndev)) {
756 pr_info("%s interface not up.\n", ndev->name);
757 err = -ENETDOWN;
758 goto rel_rt;
759 }
760
761 if (ipv6_addr_is_multicast(&daddr6->sin6_addr)) {
762 pr_info("multi-cast route %pI6 port %u, dev %s.\n",
763 daddr6->sin6_addr.s6_addr,
764 ntohs(daddr6->sin6_port), ndev->name);
765 err = -ENETUNREACH;
766 goto rel_rt;
767 }
768
769 cdev = cxgbi_device_find_by_netdev(ndev, &port);
770 if (!cdev)
771 cdev = cxgbi_device_find_by_mac(ndev, &port);
772 if (!cdev) {
773 pr_info("dst %pI6 %s, NOT cxgbi device.\n",
774 daddr6->sin6_addr.s6_addr, ndev->name);
775 err = -ENETUNREACH;
776 goto rel_rt;
777 }
778 log_debug(1 << CXGBI_DBG_SOCK,
779 "route to %pI6 :%u, ndev p#%d,%s, cdev 0x%p.\n",
780 daddr6->sin6_addr.s6_addr, ntohs(daddr6->sin6_port), port,
781 ndev->name, cdev);
782
783 csk = cxgbi_sock_create(cdev);
784 if (!csk) {
785 err = -ENOMEM;
786 goto rel_rt;
787 }
788 csk->cdev = cdev;
789 csk->port_id = port;
790 csk->mtu = mtu;
791 csk->dst = dst;
792
793 rt6_get_prefsrc(rt, &pref_saddr);
794 if (ipv6_addr_any(&pref_saddr)) {
795 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry *)rt);
796
797 err = ipv6_dev_get_saddr(&init_net, idev ? idev->dev : NULL,
798 &daddr6->sin6_addr, 0, &pref_saddr);
799 if (err) {
800 pr_info("failed to get source address to reach %pI6\n",
801 &daddr6->sin6_addr);
802 goto rel_rt;
803 }
804 }
805
806 csk->csk_family = AF_INET6;
807 csk->daddr6.sin6_addr = daddr6->sin6_addr;
808 csk->daddr6.sin6_port = daddr6->sin6_port;
809 csk->daddr6.sin6_family = daddr6->sin6_family;
810 csk->saddr6.sin6_family = daddr6->sin6_family;
811 csk->saddr6.sin6_addr = pref_saddr;
812
813 neigh_release(n);
814 return csk;
815
816 rel_rt:
817 if (n)
818 neigh_release(n);
819
820 ip6_rt_put(rt);
821 if (csk)
822 cxgbi_sock_closed(csk);
823 err_out:
824 return ERR_PTR(err);
825 }
826 #endif /* IS_ENABLED(CONFIG_IPV6) */
827
828 void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
829 unsigned int opt)
830 {
831 csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
832 dst_confirm(csk->dst);
833 smp_mb();
834 cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
835 }
836 EXPORT_SYMBOL_GPL(cxgbi_sock_established);
837
838 static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
839 {
840 log_debug(1 << CXGBI_DBG_SOCK,
841 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
842 csk, csk->state, csk->flags, csk->user_data);
843
844 if (csk->state != CTP_ESTABLISHED) {
845 read_lock_bh(&csk->callback_lock);
846 if (csk->user_data)
847 iscsi_conn_failure(csk->user_data,
848 ISCSI_ERR_TCP_CONN_CLOSE);
849 read_unlock_bh(&csk->callback_lock);
850 }
851 }
852
853 void cxgbi_sock_closed(struct cxgbi_sock *csk)
854 {
855 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
856 csk, (csk)->state, (csk)->flags, (csk)->tid);
857 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
858 if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
859 return;
860 if (csk->saddr.sin_port)
861 sock_put_port(csk);
862 if (csk->dst)
863 dst_release(csk->dst);
864 csk->cdev->csk_release_offload_resources(csk);
865 cxgbi_sock_set_state(csk, CTP_CLOSED);
866 cxgbi_inform_iscsi_conn_closing(csk);
867 cxgbi_sock_put(csk);
868 }
869 EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
870
871 static void need_active_close(struct cxgbi_sock *csk)
872 {
873 int data_lost;
874 int close_req = 0;
875
876 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
877 csk, (csk)->state, (csk)->flags, (csk)->tid);
878 spin_lock_bh(&csk->lock);
879 if (csk->dst)
880 dst_confirm(csk->dst);
881 data_lost = skb_queue_len(&csk->receive_queue);
882 __skb_queue_purge(&csk->receive_queue);
883
884 if (csk->state == CTP_ACTIVE_OPEN)
885 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
886 else if (csk->state == CTP_ESTABLISHED) {
887 close_req = 1;
888 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
889 } else if (csk->state == CTP_PASSIVE_CLOSE) {
890 close_req = 1;
891 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
892 }
893
894 if (close_req) {
895 if (!cxgbi_sock_flag(csk, CTPF_LOGOUT_RSP_RCVD) ||
896 data_lost)
897 csk->cdev->csk_send_abort_req(csk);
898 else
899 csk->cdev->csk_send_close_req(csk);
900 }
901
902 spin_unlock_bh(&csk->lock);
903 }
904
905 void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
906 {
907 pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
908 csk, csk->state, csk->flags,
909 &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
910 &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
911 errno);
912
913 cxgbi_sock_set_state(csk, CTP_CONNECTING);
914 csk->err = errno;
915 cxgbi_sock_closed(csk);
916 }
917 EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
918
919 void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
920 {
921 struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
922 struct module *owner = csk->cdev->owner;
923
924 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
925 csk, (csk)->state, (csk)->flags, (csk)->tid);
926 cxgbi_sock_get(csk);
927 spin_lock_bh(&csk->lock);
928 if (csk->state == CTP_ACTIVE_OPEN)
929 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
930 spin_unlock_bh(&csk->lock);
931 cxgbi_sock_put(csk);
932 __kfree_skb(skb);
933
934 module_put(owner);
935 }
936 EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
937
938 void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
939 {
940 cxgbi_sock_get(csk);
941 spin_lock_bh(&csk->lock);
942
943 cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
944 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
945 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
946 if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
947 pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
948 csk, csk->state, csk->flags, csk->tid);
949 cxgbi_sock_closed(csk);
950 }
951
952 spin_unlock_bh(&csk->lock);
953 cxgbi_sock_put(csk);
954 }
955 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
956
957 void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
958 {
959 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
960 csk, (csk)->state, (csk)->flags, (csk)->tid);
961 cxgbi_sock_get(csk);
962 spin_lock_bh(&csk->lock);
963
964 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
965 goto done;
966
967 switch (csk->state) {
968 case CTP_ESTABLISHED:
969 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
970 break;
971 case CTP_ACTIVE_CLOSE:
972 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
973 break;
974 case CTP_CLOSE_WAIT_1:
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 cxgbi_inform_iscsi_conn_closing(csk);
984 done:
985 spin_unlock_bh(&csk->lock);
986 cxgbi_sock_put(csk);
987 }
988 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
989
990 void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
991 {
992 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
993 csk, (csk)->state, (csk)->flags, (csk)->tid);
994 cxgbi_sock_get(csk);
995 spin_lock_bh(&csk->lock);
996
997 csk->snd_una = snd_nxt - 1;
998 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
999 goto done;
1000
1001 switch (csk->state) {
1002 case CTP_ACTIVE_CLOSE:
1003 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
1004 break;
1005 case CTP_CLOSE_WAIT_1:
1006 case CTP_CLOSE_WAIT_2:
1007 cxgbi_sock_closed(csk);
1008 break;
1009 case CTP_ABORTING:
1010 break;
1011 default:
1012 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
1013 csk, csk->state, csk->flags, csk->tid);
1014 }
1015 done:
1016 spin_unlock_bh(&csk->lock);
1017 cxgbi_sock_put(csk);
1018 }
1019 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
1020
1021 void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
1022 unsigned int snd_una, int seq_chk)
1023 {
1024 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1025 "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
1026 csk, csk->state, csk->flags, csk->tid, credits,
1027 csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
1028
1029 spin_lock_bh(&csk->lock);
1030
1031 csk->wr_cred += credits;
1032 if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
1033 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
1034
1035 while (credits) {
1036 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
1037
1038 if (unlikely(!p)) {
1039 pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
1040 csk, csk->state, csk->flags, csk->tid, credits,
1041 csk->wr_cred, csk->wr_una_cred);
1042 break;
1043 }
1044
1045 if (unlikely(credits < p->csum)) {
1046 pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
1047 csk, csk->state, csk->flags, csk->tid,
1048 credits, csk->wr_cred, csk->wr_una_cred,
1049 p->csum);
1050 p->csum -= credits;
1051 break;
1052 } else {
1053 cxgbi_sock_dequeue_wr(csk);
1054 credits -= p->csum;
1055 kfree_skb(p);
1056 }
1057 }
1058
1059 cxgbi_sock_check_wr_invariants(csk);
1060
1061 if (seq_chk) {
1062 if (unlikely(before(snd_una, csk->snd_una))) {
1063 pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
1064 csk, csk->state, csk->flags, csk->tid, snd_una,
1065 csk->snd_una);
1066 goto done;
1067 }
1068
1069 if (csk->snd_una != snd_una) {
1070 csk->snd_una = snd_una;
1071 dst_confirm(csk->dst);
1072 }
1073 }
1074
1075 if (skb_queue_len(&csk->write_queue)) {
1076 if (csk->cdev->csk_push_tx_frames(csk, 0))
1077 cxgbi_conn_tx_open(csk);
1078 } else
1079 cxgbi_conn_tx_open(csk);
1080 done:
1081 spin_unlock_bh(&csk->lock);
1082 }
1083 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
1084
1085 static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
1086 unsigned short mtu)
1087 {
1088 int i = 0;
1089
1090 while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
1091 ++i;
1092
1093 return i;
1094 }
1095
1096 unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
1097 {
1098 unsigned int idx;
1099 struct dst_entry *dst = csk->dst;
1100
1101 csk->advmss = dst_metric_advmss(dst);
1102
1103 if (csk->advmss > pmtu - 40)
1104 csk->advmss = pmtu - 40;
1105 if (csk->advmss < csk->cdev->mtus[0] - 40)
1106 csk->advmss = csk->cdev->mtus[0] - 40;
1107 idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
1108
1109 return idx;
1110 }
1111 EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
1112
1113 void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
1114 {
1115 cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
1116 __skb_queue_tail(&csk->write_queue, skb);
1117 }
1118 EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
1119
1120 void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
1121 {
1122 struct sk_buff *skb;
1123
1124 while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
1125 kfree_skb(skb);
1126 }
1127 EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
1128
1129 void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
1130 {
1131 int pending = cxgbi_sock_count_pending_wrs(csk);
1132
1133 if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
1134 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
1135 csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
1136 }
1137 EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
1138
1139 static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
1140 {
1141 struct cxgbi_device *cdev = csk->cdev;
1142 struct sk_buff *next;
1143 int err, copied = 0;
1144
1145 spin_lock_bh(&csk->lock);
1146
1147 if (csk->state != CTP_ESTABLISHED) {
1148 log_debug(1 << CXGBI_DBG_PDU_TX,
1149 "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
1150 csk, csk->state, csk->flags, csk->tid);
1151 err = -EAGAIN;
1152 goto out_err;
1153 }
1154
1155 if (csk->err) {
1156 log_debug(1 << CXGBI_DBG_PDU_TX,
1157 "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
1158 csk, csk->state, csk->flags, csk->tid, csk->err);
1159 err = -EPIPE;
1160 goto out_err;
1161 }
1162
1163 if (csk->write_seq - csk->snd_una >= csk->snd_win) {
1164 log_debug(1 << CXGBI_DBG_PDU_TX,
1165 "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
1166 csk, csk->state, csk->flags, csk->tid, csk->write_seq,
1167 csk->snd_una, csk->snd_win);
1168 err = -ENOBUFS;
1169 goto out_err;
1170 }
1171
1172 while (skb) {
1173 int frags = skb_shinfo(skb)->nr_frags +
1174 (skb->len != skb->data_len);
1175
1176 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
1177 pr_err("csk 0x%p, skb head %u < %u.\n",
1178 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
1179 err = -EINVAL;
1180 goto out_err;
1181 }
1182
1183 if (frags >= SKB_WR_LIST_SIZE) {
1184 pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
1185 csk, skb_shinfo(skb)->nr_frags, skb->len,
1186 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
1187 err = -EINVAL;
1188 goto out_err;
1189 }
1190
1191 next = skb->next;
1192 skb->next = NULL;
1193 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
1194 cxgbi_sock_skb_entail(csk, skb);
1195 copied += skb->len;
1196 csk->write_seq += skb->len +
1197 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
1198 skb = next;
1199 }
1200
1201 if (likely(skb_queue_len(&csk->write_queue)))
1202 cdev->csk_push_tx_frames(csk, 1);
1203 done:
1204 spin_unlock_bh(&csk->lock);
1205 return copied;
1206
1207 out_err:
1208 if (copied == 0 && err == -EPIPE)
1209 copied = csk->err ? csk->err : -EPIPE;
1210 else
1211 copied = err;
1212 goto done;
1213 }
1214
1215 static inline void
1216 scmd_get_params(struct scsi_cmnd *sc, struct scatterlist **sgl,
1217 unsigned int *sgcnt, unsigned int *dlen,
1218 unsigned int prot)
1219 {
1220 struct scsi_data_buffer *sdb = prot ? scsi_prot(sc) : &sc->sdb;
1221
1222 *sgl = sdb->table.sgl;
1223 *sgcnt = sdb->table.nents;
1224 *dlen = sdb->length;
1225 /* Caution: for protection sdb, sdb->length is invalid */
1226 }
1227
1228 void cxgbi_ddp_set_one_ppod(struct cxgbi_pagepod *ppod,
1229 struct cxgbi_task_tag_info *ttinfo,
1230 struct scatterlist **sg_pp, unsigned int *sg_off)
1231 {
1232 struct scatterlist *sg = sg_pp ? *sg_pp : NULL;
1233 unsigned int offset = sg_off ? *sg_off : 0;
1234 dma_addr_t addr = 0UL;
1235 unsigned int len = 0;
1236 int i;
1237
1238 memcpy(ppod, &ttinfo->hdr, sizeof(struct cxgbi_pagepod_hdr));
1239
1240 if (sg) {
1241 addr = sg_dma_address(sg);
1242 len = sg_dma_len(sg);
1243 }
1244
1245 for (i = 0; i < PPOD_PAGES_MAX; i++) {
1246 if (sg) {
1247 ppod->addr[i] = cpu_to_be64(addr + offset);
1248 offset += PAGE_SIZE;
1249 if (offset == (len + sg->offset)) {
1250 offset = 0;
1251 sg = sg_next(sg);
1252 if (sg) {
1253 addr = sg_dma_address(sg);
1254 len = sg_dma_len(sg);
1255 }
1256 }
1257 } else {
1258 ppod->addr[i] = 0ULL;
1259 }
1260 }
1261
1262 /*
1263 * the fifth address needs to be repeated in the next ppod, so do
1264 * not move sg
1265 */
1266 if (sg_pp) {
1267 *sg_pp = sg;
1268 *sg_off = offset;
1269 }
1270
1271 if (offset == len) {
1272 offset = 0;
1273 sg = sg_next(sg);
1274 if (sg) {
1275 addr = sg_dma_address(sg);
1276 len = sg_dma_len(sg);
1277 }
1278 }
1279 ppod->addr[i] = sg ? cpu_to_be64(addr + offset) : 0ULL;
1280 }
1281 EXPORT_SYMBOL_GPL(cxgbi_ddp_set_one_ppod);
1282
1283 /*
1284 * APIs interacting with open-iscsi libraries
1285 */
1286
1287 static unsigned char padding[4];
1288
1289 int cxgbi_ddp_ppm_setup(void **ppm_pp, struct cxgbi_device *cdev,
1290 struct cxgbi_tag_format *tformat,
1291 unsigned int iscsi_size, unsigned int llimit,
1292 unsigned int start, unsigned int rsvd_factor,
1293 unsigned int edram_start, unsigned int edram_size)
1294 {
1295 int err = cxgbi_ppm_init(ppm_pp, cdev->ports[0], cdev->pdev,
1296 cdev->lldev, tformat, iscsi_size, llimit, start,
1297 rsvd_factor, edram_start, edram_size);
1298
1299 if (err >= 0) {
1300 struct cxgbi_ppm *ppm = (struct cxgbi_ppm *)(*ppm_pp);
1301
1302 if (ppm->ppmax < 1024 ||
1303 ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX)
1304 cdev->flags |= CXGBI_FLAG_DDP_OFF;
1305 err = 0;
1306 } else {
1307 cdev->flags |= CXGBI_FLAG_DDP_OFF;
1308 }
1309
1310 return err;
1311 }
1312 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppm_setup);
1313
1314 static int cxgbi_ddp_sgl_check(struct scatterlist *sgl, int nents)
1315 {
1316 int i;
1317 int last_sgidx = nents - 1;
1318 struct scatterlist *sg = sgl;
1319
1320 for (i = 0; i < nents; i++, sg = sg_next(sg)) {
1321 unsigned int len = sg->length + sg->offset;
1322
1323 if ((sg->offset & 0x3) || (i && sg->offset) ||
1324 ((i != last_sgidx) && len != PAGE_SIZE)) {
1325 log_debug(1 << CXGBI_DBG_DDP,
1326 "sg %u/%u, %u,%u, not aligned.\n",
1327 i, nents, sg->offset, sg->length);
1328 goto err_out;
1329 }
1330 }
1331 return 0;
1332 err_out:
1333 return -EINVAL;
1334 }
1335
1336 static int cxgbi_ddp_reserve(struct cxgbi_conn *cconn,
1337 struct cxgbi_task_data *tdata, u32 sw_tag,
1338 unsigned int xferlen)
1339 {
1340 struct cxgbi_sock *csk = cconn->cep->csk;
1341 struct cxgbi_device *cdev = csk->cdev;
1342 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1343 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1344 struct scatterlist *sgl = ttinfo->sgl;
1345 unsigned int sgcnt = ttinfo->nents;
1346 unsigned int sg_offset = sgl->offset;
1347 int err;
1348
1349 if (cdev->flags & CXGBI_FLAG_DDP_OFF) {
1350 log_debug(1 << CXGBI_DBG_DDP,
1351 "cdev 0x%p DDP off.\n", cdev);
1352 return -EINVAL;
1353 }
1354
1355 if (!ppm || xferlen < DDP_THRESHOLD || !sgcnt ||
1356 ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX) {
1357 log_debug(1 << CXGBI_DBG_DDP,
1358 "ppm 0x%p, pgidx %u, xfer %u, sgcnt %u, NO ddp.\n",
1359 ppm, ppm ? ppm->tformat.pgsz_idx_dflt : DDP_PGIDX_MAX,
1360 xferlen, ttinfo->nents);
1361 return -EINVAL;
1362 }
1363
1364 /* make sure the buffer is suitable for ddp */
1365 if (cxgbi_ddp_sgl_check(sgl, sgcnt) < 0)
1366 return -EINVAL;
1367
1368 ttinfo->nr_pages = (xferlen + sgl->offset + (1 << PAGE_SHIFT) - 1) >>
1369 PAGE_SHIFT;
1370
1371 /*
1372 * the ddp tag will be used for the itt in the outgoing pdu,
1373 * the itt genrated by libiscsi is saved in the ppm and can be
1374 * retrieved via the ddp tag
1375 */
1376 err = cxgbi_ppm_ppods_reserve(ppm, ttinfo->nr_pages, 0, &ttinfo->idx,
1377 &ttinfo->tag, (unsigned long)sw_tag);
1378 if (err < 0) {
1379 cconn->ddp_full++;
1380 return err;
1381 }
1382 ttinfo->npods = err;
1383
1384 /* setup dma from scsi command sgl */
1385 sgl->offset = 0;
1386 err = dma_map_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1387 sgl->offset = sg_offset;
1388 if (err == 0) {
1389 pr_info("%s: 0x%x, xfer %u, sgl %u dma mapping err.\n",
1390 __func__, sw_tag, xferlen, sgcnt);
1391 goto rel_ppods;
1392 }
1393 if (err != ttinfo->nr_pages) {
1394 log_debug(1 << CXGBI_DBG_DDP,
1395 "%s: sw tag 0x%x, xfer %u, sgl %u, dma count %d.\n",
1396 __func__, sw_tag, xferlen, sgcnt, err);
1397 }
1398
1399 ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_MAPPED;
1400 ttinfo->cid = csk->port_id;
1401
1402 cxgbi_ppm_make_ppod_hdr(ppm, ttinfo->tag, csk->tid, sgl->offset,
1403 xferlen, &ttinfo->hdr);
1404
1405 if (cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ) {
1406 /* write ppod from xmit_pdu (of iscsi_scsi_command pdu) */
1407 ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_VALID;
1408 } else {
1409 /* write ppod from control queue now */
1410 err = cdev->csk_ddp_set_map(ppm, csk, ttinfo);
1411 if (err < 0)
1412 goto rel_ppods;
1413 }
1414
1415 return 0;
1416
1417 rel_ppods:
1418 cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1419
1420 if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_MAPPED) {
1421 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_MAPPED;
1422 dma_unmap_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1423 }
1424 return -EINVAL;
1425 }
1426
1427 static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1428 {
1429 struct scsi_cmnd *sc = task->sc;
1430 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1431 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1432 struct cxgbi_device *cdev = cconn->chba->cdev;
1433 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1434 u32 tag = ntohl((__force u32)hdr_itt);
1435
1436 log_debug(1 << CXGBI_DBG_DDP,
1437 "cdev 0x%p, task 0x%p, release tag 0x%x.\n",
1438 cdev, task, tag);
1439 if (sc && sc->sc_data_direction == DMA_FROM_DEVICE &&
1440 cxgbi_ppm_is_ddp_tag(ppm, tag)) {
1441 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1442 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1443
1444 if (!(cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ))
1445 cdev->csk_ddp_clear_map(cdev, ppm, ttinfo);
1446 cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1447 dma_unmap_sg(&ppm->pdev->dev, ttinfo->sgl, ttinfo->nents,
1448 DMA_FROM_DEVICE);
1449 }
1450 }
1451
1452 static inline u32 cxgbi_build_sw_tag(u32 idx, u32 age)
1453 {
1454 /* assume idx and age both are < 0x7FFF (32767) */
1455 return (idx << 16) | age;
1456 }
1457
1458 static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1459 {
1460 struct scsi_cmnd *sc = task->sc;
1461 struct iscsi_conn *conn = task->conn;
1462 struct iscsi_session *sess = conn->session;
1463 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1464 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1465 struct cxgbi_device *cdev = cconn->chba->cdev;
1466 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1467 u32 sw_tag = cxgbi_build_sw_tag(task->itt, sess->age);
1468 u32 tag = 0;
1469 int err = -EINVAL;
1470
1471 if (sc && sc->sc_data_direction == DMA_FROM_DEVICE) {
1472 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1473 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1474
1475 scmd_get_params(sc, &ttinfo->sgl, &ttinfo->nents,
1476 &tdata->dlen, 0);
1477 err = cxgbi_ddp_reserve(cconn, tdata, sw_tag, tdata->dlen);
1478 if (!err)
1479 tag = ttinfo->tag;
1480 else
1481 log_debug(1 << CXGBI_DBG_DDP,
1482 "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1483 cconn->cep->csk, task, tdata->dlen,
1484 ttinfo->nents);
1485 }
1486
1487 if (err < 0) {
1488 err = cxgbi_ppm_make_non_ddp_tag(ppm, sw_tag, &tag);
1489 if (err < 0)
1490 return err;
1491 }
1492 /* the itt need to sent in big-endian order */
1493 *hdr_itt = (__force itt_t)htonl(tag);
1494
1495 log_debug(1 << CXGBI_DBG_DDP,
1496 "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1497 cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1498 return 0;
1499 }
1500
1501 void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1502 {
1503 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1504 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1505 struct cxgbi_device *cdev = cconn->chba->cdev;
1506 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1507 u32 tag = ntohl((__force u32)itt);
1508 u32 sw_bits;
1509
1510 if (ppm) {
1511 if (cxgbi_ppm_is_ddp_tag(ppm, tag))
1512 sw_bits = cxgbi_ppm_get_tag_caller_data(ppm, tag);
1513 else
1514 sw_bits = cxgbi_ppm_decode_non_ddp_tag(ppm, tag);
1515 } else {
1516 sw_bits = tag;
1517 }
1518
1519 cxgbi_decode_sw_tag(sw_bits, idx, age);
1520 log_debug(1 << CXGBI_DBG_DDP,
1521 "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1522 cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1523 age ? *age : 0xFF);
1524 }
1525 EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1526
1527 void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1528 {
1529 struct iscsi_conn *conn = csk->user_data;
1530
1531 if (conn) {
1532 log_debug(1 << CXGBI_DBG_SOCK,
1533 "csk 0x%p, cid %d.\n", csk, conn->id);
1534 iscsi_conn_queue_work(conn);
1535 }
1536 }
1537 EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1538
1539 /*
1540 * pdu receive, interact with libiscsi_tcp
1541 */
1542 static inline int read_pdu_skb(struct iscsi_conn *conn,
1543 struct sk_buff *skb,
1544 unsigned int offset,
1545 int offloaded)
1546 {
1547 int status = 0;
1548 int bytes_read;
1549
1550 bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1551 switch (status) {
1552 case ISCSI_TCP_CONN_ERR:
1553 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1554 skb, offset, offloaded);
1555 return -EIO;
1556 case ISCSI_TCP_SUSPENDED:
1557 log_debug(1 << CXGBI_DBG_PDU_RX,
1558 "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1559 skb, offset, offloaded, bytes_read);
1560 /* no transfer - just have caller flush queue */
1561 return bytes_read;
1562 case ISCSI_TCP_SKB_DONE:
1563 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1564 skb, offset, offloaded);
1565 /*
1566 * pdus should always fit in the skb and we should get
1567 * segment done notifcation.
1568 */
1569 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1570 return -EFAULT;
1571 case ISCSI_TCP_SEGMENT_DONE:
1572 log_debug(1 << CXGBI_DBG_PDU_RX,
1573 "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1574 skb, offset, offloaded, bytes_read);
1575 return bytes_read;
1576 default:
1577 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1578 skb, offset, offloaded, status);
1579 return -EINVAL;
1580 }
1581 }
1582
1583 static int
1584 skb_read_pdu_bhs(struct cxgbi_sock *csk, struct iscsi_conn *conn,
1585 struct sk_buff *skb)
1586 {
1587 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1588 int err;
1589
1590 log_debug(1 << CXGBI_DBG_PDU_RX,
1591 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1592 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1593
1594 if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1595 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1596 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1597 return -EIO;
1598 }
1599
1600 if (conn->hdrdgst_en &&
1601 cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1602 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1603 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1604 return -EIO;
1605 }
1606
1607 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_ISCSI_COMPL) &&
1608 cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA_DDPD)) {
1609 /* If completion flag is set and data is directly
1610 * placed in to the host memory then update
1611 * task->exp_datasn to the datasn in completion
1612 * iSCSI hdr as T6 adapter generates completion only
1613 * for the last pdu of a sequence.
1614 */
1615 itt_t itt = ((struct iscsi_data *)skb->data)->itt;
1616 struct iscsi_task *task = iscsi_itt_to_ctask(conn, itt);
1617 u32 data_sn = be32_to_cpu(((struct iscsi_data *)
1618 skb->data)->datasn);
1619 if (task && task->sc) {
1620 struct iscsi_tcp_task *tcp_task = task->dd_data;
1621
1622 tcp_task->exp_datasn = data_sn;
1623 }
1624 }
1625
1626 err = read_pdu_skb(conn, skb, 0, 0);
1627 if (likely(err >= 0)) {
1628 struct iscsi_hdr *hdr = (struct iscsi_hdr *)skb->data;
1629 u8 opcode = hdr->opcode & ISCSI_OPCODE_MASK;
1630
1631 if (unlikely(opcode == ISCSI_OP_LOGOUT_RSP))
1632 cxgbi_sock_set_flag(csk, CTPF_LOGOUT_RSP_RCVD);
1633 }
1634
1635 return err;
1636 }
1637
1638 static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1639 struct sk_buff *skb, unsigned int offset)
1640 {
1641 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1642 bool offloaded = 0;
1643 int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1644
1645 log_debug(1 << CXGBI_DBG_PDU_RX,
1646 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1647 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1648
1649 if (conn->datadgst_en &&
1650 cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1651 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1652 conn, lskb, cxgbi_skcb_flags(lskb));
1653 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1654 return -EIO;
1655 }
1656
1657 if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1658 return 0;
1659
1660 /* coalesced, add header digest length */
1661 if (lskb == skb && conn->hdrdgst_en)
1662 offset += ISCSI_DIGEST_SIZE;
1663
1664 if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1665 offloaded = 1;
1666
1667 if (opcode == ISCSI_OP_SCSI_DATA_IN)
1668 log_debug(1 << CXGBI_DBG_PDU_RX,
1669 "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1670 skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1671 tcp_conn->in.datalen, offloaded ? "is" : "not");
1672
1673 return read_pdu_skb(conn, skb, offset, offloaded);
1674 }
1675
1676 static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1677 {
1678 struct cxgbi_device *cdev = csk->cdev;
1679 int must_send;
1680 u32 credits;
1681
1682 log_debug(1 << CXGBI_DBG_PDU_RX,
1683 "csk 0x%p,%u,0x%lx,%u, seq %u, wup %u, thre %u, %u.\n",
1684 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1685 csk->rcv_wup, cdev->rx_credit_thres,
1686 csk->rcv_win);
1687
1688 if (!cdev->rx_credit_thres)
1689 return;
1690
1691 if (csk->state != CTP_ESTABLISHED)
1692 return;
1693
1694 credits = csk->copied_seq - csk->rcv_wup;
1695 if (unlikely(!credits))
1696 return;
1697 must_send = credits + 16384 >= csk->rcv_win;
1698 if (must_send || credits >= cdev->rx_credit_thres)
1699 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1700 }
1701
1702 void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1703 {
1704 struct cxgbi_device *cdev = csk->cdev;
1705 struct iscsi_conn *conn = csk->user_data;
1706 struct sk_buff *skb;
1707 unsigned int read = 0;
1708 int err = 0;
1709
1710 log_debug(1 << CXGBI_DBG_PDU_RX,
1711 "csk 0x%p, conn 0x%p.\n", csk, conn);
1712
1713 if (unlikely(!conn || conn->suspend_rx)) {
1714 log_debug(1 << CXGBI_DBG_PDU_RX,
1715 "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1716 csk, conn, conn ? conn->id : 0xFF,
1717 conn ? conn->suspend_rx : 0xFF);
1718 return;
1719 }
1720
1721 while (!err) {
1722 skb = skb_peek(&csk->receive_queue);
1723 if (!skb ||
1724 !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1725 if (skb)
1726 log_debug(1 << CXGBI_DBG_PDU_RX,
1727 "skb 0x%p, NOT ready 0x%lx.\n",
1728 skb, cxgbi_skcb_flags(skb));
1729 break;
1730 }
1731 __skb_unlink(skb, &csk->receive_queue);
1732
1733 read += cxgbi_skcb_rx_pdulen(skb);
1734 log_debug(1 << CXGBI_DBG_PDU_RX,
1735 "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1736 csk, skb, skb->len, cxgbi_skcb_flags(skb),
1737 cxgbi_skcb_rx_pdulen(skb));
1738
1739 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1740 err = skb_read_pdu_bhs(csk, conn, skb);
1741 if (err < 0) {
1742 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1743 "f 0x%lx, plen %u.\n",
1744 csk, skb, skb->len,
1745 cxgbi_skcb_flags(skb),
1746 cxgbi_skcb_rx_pdulen(skb));
1747 goto skb_done;
1748 }
1749 err = skb_read_pdu_data(conn, skb, skb,
1750 err + cdev->skb_rx_extra);
1751 if (err < 0)
1752 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1753 "f 0x%lx, plen %u.\n",
1754 csk, skb, skb->len,
1755 cxgbi_skcb_flags(skb),
1756 cxgbi_skcb_rx_pdulen(skb));
1757 } else {
1758 err = skb_read_pdu_bhs(csk, conn, skb);
1759 if (err < 0) {
1760 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1761 "f 0x%lx, plen %u.\n",
1762 csk, skb, skb->len,
1763 cxgbi_skcb_flags(skb),
1764 cxgbi_skcb_rx_pdulen(skb));
1765 goto skb_done;
1766 }
1767
1768 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1769 struct sk_buff *dskb;
1770
1771 dskb = skb_peek(&csk->receive_queue);
1772 if (!dskb) {
1773 pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1774 " plen %u, NO data.\n",
1775 csk, skb, skb->len,
1776 cxgbi_skcb_flags(skb),
1777 cxgbi_skcb_rx_pdulen(skb));
1778 err = -EIO;
1779 goto skb_done;
1780 }
1781 __skb_unlink(dskb, &csk->receive_queue);
1782
1783 err = skb_read_pdu_data(conn, skb, dskb, 0);
1784 if (err < 0)
1785 pr_err("data, csk 0x%p, skb 0x%p,%u, "
1786 "f 0x%lx, plen %u, dskb 0x%p,"
1787 "%u.\n",
1788 csk, skb, skb->len,
1789 cxgbi_skcb_flags(skb),
1790 cxgbi_skcb_rx_pdulen(skb),
1791 dskb, dskb->len);
1792 __kfree_skb(dskb);
1793 } else
1794 err = skb_read_pdu_data(conn, skb, skb, 0);
1795 }
1796 skb_done:
1797 __kfree_skb(skb);
1798
1799 if (err < 0)
1800 break;
1801 }
1802
1803 log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
1804 if (read) {
1805 csk->copied_seq += read;
1806 csk_return_rx_credits(csk, read);
1807 conn->rxdata_octets += read;
1808 }
1809
1810 if (err < 0) {
1811 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
1812 csk, conn, err, read);
1813 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1814 }
1815 }
1816 EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
1817
1818 static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
1819 unsigned int offset, unsigned int *off,
1820 struct scatterlist **sgp)
1821 {
1822 int i;
1823 struct scatterlist *sg;
1824
1825 for_each_sg(sgl, sg, sgcnt, i) {
1826 if (offset < sg->length) {
1827 *off = offset;
1828 *sgp = sg;
1829 return 0;
1830 }
1831 offset -= sg->length;
1832 }
1833 return -EFAULT;
1834 }
1835
1836 static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
1837 unsigned int dlen, struct page_frag *frags,
1838 int frag_max)
1839 {
1840 unsigned int datalen = dlen;
1841 unsigned int sglen = sg->length - sgoffset;
1842 struct page *page = sg_page(sg);
1843 int i;
1844
1845 i = 0;
1846 do {
1847 unsigned int copy;
1848
1849 if (!sglen) {
1850 sg = sg_next(sg);
1851 if (!sg) {
1852 pr_warn("sg %d NULL, len %u/%u.\n",
1853 i, datalen, dlen);
1854 return -EINVAL;
1855 }
1856 sgoffset = 0;
1857 sglen = sg->length;
1858 page = sg_page(sg);
1859
1860 }
1861 copy = min(datalen, sglen);
1862 if (i && page == frags[i - 1].page &&
1863 sgoffset + sg->offset ==
1864 frags[i - 1].offset + frags[i - 1].size) {
1865 frags[i - 1].size += copy;
1866 } else {
1867 if (i >= frag_max) {
1868 pr_warn("too many pages %u, dlen %u.\n",
1869 frag_max, dlen);
1870 return -EINVAL;
1871 }
1872
1873 frags[i].page = page;
1874 frags[i].offset = sg->offset + sgoffset;
1875 frags[i].size = copy;
1876 i++;
1877 }
1878 datalen -= copy;
1879 sgoffset += copy;
1880 sglen -= copy;
1881 } while (datalen);
1882
1883 return i;
1884 }
1885
1886 int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
1887 {
1888 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1889 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1890 struct cxgbi_device *cdev = cconn->chba->cdev;
1891 struct iscsi_conn *conn = task->conn;
1892 struct iscsi_tcp_task *tcp_task = task->dd_data;
1893 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1894 struct scsi_cmnd *sc = task->sc;
1895 struct cxgbi_sock *csk = cconn->cep->csk;
1896 struct net_device *ndev = cdev->ports[csk->port_id];
1897 int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
1898
1899 tcp_task->dd_data = tdata;
1900 task->hdr = NULL;
1901
1902 if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
1903 (opcode == ISCSI_OP_SCSI_DATA_OUT ||
1904 (opcode == ISCSI_OP_SCSI_CMD &&
1905 sc->sc_data_direction == DMA_TO_DEVICE)))
1906 /* data could goes into skb head */
1907 headroom += min_t(unsigned int,
1908 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
1909 conn->max_xmit_dlength);
1910
1911 tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
1912 if (!tdata->skb) {
1913 ndev->stats.tx_dropped++;
1914 return -ENOMEM;
1915 }
1916
1917 skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
1918
1919 if (task->sc) {
1920 task->hdr = (struct iscsi_hdr *)tdata->skb->data;
1921 } else {
1922 task->hdr = kzalloc(SKB_TX_ISCSI_PDU_HEADER_MAX, GFP_ATOMIC);
1923 if (!task->hdr) {
1924 __kfree_skb(tdata->skb);
1925 tdata->skb = NULL;
1926 ndev->stats.tx_dropped++;
1927 return -ENOMEM;
1928 }
1929 }
1930 task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
1931
1932 /* data_out uses scsi_cmd's itt */
1933 if (opcode != ISCSI_OP_SCSI_DATA_OUT)
1934 task_reserve_itt(task, &task->hdr->itt);
1935
1936 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1937 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
1938 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
1939 conn->max_xmit_dlength, ntohl(task->hdr->itt));
1940
1941 return 0;
1942 }
1943 EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
1944
1945 static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
1946 {
1947 if (hcrc || dcrc) {
1948 u8 submode = 0;
1949
1950 if (hcrc)
1951 submode |= 1;
1952 if (dcrc)
1953 submode |= 2;
1954 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
1955 } else
1956 cxgbi_skcb_ulp_mode(skb) = 0;
1957 }
1958
1959 int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
1960 unsigned int count)
1961 {
1962 struct iscsi_conn *conn = task->conn;
1963 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1964 struct sk_buff *skb = tdata->skb;
1965 unsigned int datalen = count;
1966 int i, padlen = iscsi_padding(count);
1967 struct page *pg;
1968
1969 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1970 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
1971 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
1972 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
1973
1974 skb_put(skb, task->hdr_len);
1975 tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
1976 if (!count)
1977 return 0;
1978
1979 if (task->sc) {
1980 struct scsi_data_buffer *sdb = &task->sc->sdb;
1981 struct scatterlist *sg = NULL;
1982 int err;
1983
1984 tdata->offset = offset;
1985 tdata->count = count;
1986 err = sgl_seek_offset(
1987 sdb->table.sgl, sdb->table.nents,
1988 tdata->offset, &tdata->sgoffset, &sg);
1989 if (err < 0) {
1990 pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
1991 sdb->table.nents, tdata->offset, sdb->length);
1992 return err;
1993 }
1994 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
1995 tdata->frags, MAX_PDU_FRAGS);
1996 if (err < 0) {
1997 pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
1998 sdb->table.nents, tdata->offset, tdata->count);
1999 return err;
2000 }
2001 tdata->nr_frags = err;
2002
2003 if (tdata->nr_frags > MAX_SKB_FRAGS ||
2004 (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
2005 char *dst = skb->data + task->hdr_len;
2006 struct page_frag *frag = tdata->frags;
2007
2008 /* data fits in the skb's headroom */
2009 for (i = 0; i < tdata->nr_frags; i++, frag++) {
2010 char *src = kmap_atomic(frag->page);
2011
2012 memcpy(dst, src+frag->offset, frag->size);
2013 dst += frag->size;
2014 kunmap_atomic(src);
2015 }
2016 if (padlen) {
2017 memset(dst, 0, padlen);
2018 padlen = 0;
2019 }
2020 skb_put(skb, count + padlen);
2021 } else {
2022 /* data fit into frag_list */
2023 for (i = 0; i < tdata->nr_frags; i++) {
2024 __skb_fill_page_desc(skb, i,
2025 tdata->frags[i].page,
2026 tdata->frags[i].offset,
2027 tdata->frags[i].size);
2028 skb_frag_ref(skb, i);
2029 }
2030 skb_shinfo(skb)->nr_frags = tdata->nr_frags;
2031 skb->len += count;
2032 skb->data_len += count;
2033 skb->truesize += count;
2034 }
2035
2036 } else {
2037 pg = virt_to_page(task->data);
2038
2039 get_page(pg);
2040 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
2041 count);
2042 skb->len += count;
2043 skb->data_len += count;
2044 skb->truesize += count;
2045 }
2046
2047 if (padlen) {
2048 i = skb_shinfo(skb)->nr_frags;
2049 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
2050 virt_to_page(padding), offset_in_page(padding),
2051 padlen);
2052
2053 skb->data_len += padlen;
2054 skb->truesize += padlen;
2055 skb->len += padlen;
2056 }
2057
2058 return 0;
2059 }
2060 EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
2061
2062 int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2063 {
2064 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2065 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2066 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2067 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
2068 struct sk_buff *skb = tdata->skb;
2069 struct cxgbi_sock *csk = NULL;
2070 unsigned int datalen;
2071 int err;
2072
2073 if (!skb) {
2074 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2075 "task 0x%p\n", task);
2076 return 0;
2077 }
2078
2079 if (cconn && cconn->cep)
2080 csk = cconn->cep->csk;
2081 if (!csk) {
2082 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2083 "task 0x%p, csk gone.\n", task);
2084 return -EPIPE;
2085 }
2086
2087 tdata->skb = NULL;
2088 datalen = skb->data_len;
2089
2090 /* write ppod first if using ofldq to write ppod */
2091 if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_VALID) {
2092 struct cxgbi_ppm *ppm = csk->cdev->cdev2ppm(csk->cdev);
2093
2094 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_VALID;
2095 if (csk->cdev->csk_ddp_set_map(ppm, csk, ttinfo) < 0)
2096 pr_err("task 0x%p, ppod writing using ofldq failed.\n",
2097 task);
2098 /* continue. Let fl get the data */
2099 }
2100
2101 if (!task->sc)
2102 memcpy(skb->data, task->hdr, SKB_TX_ISCSI_PDU_HEADER_MAX);
2103
2104 err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2105 if (err > 0) {
2106 int pdulen = err;
2107
2108 log_debug(1 << CXGBI_DBG_PDU_TX,
2109 "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2110 task, task->sc, skb, skb->len, skb->data_len, err);
2111
2112 if (task->conn->hdrdgst_en)
2113 pdulen += ISCSI_DIGEST_SIZE;
2114
2115 if (datalen && task->conn->datadgst_en)
2116 pdulen += ISCSI_DIGEST_SIZE;
2117
2118 task->conn->txdata_octets += pdulen;
2119 return 0;
2120 }
2121
2122 if (err == -EAGAIN || err == -ENOBUFS) {
2123 log_debug(1 << CXGBI_DBG_PDU_TX,
2124 "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2125 task, skb, skb->len, skb->data_len, err);
2126 /* reset skb to send when we are called again */
2127 tdata->skb = skb;
2128 return err;
2129 }
2130
2131 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2132 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2133 task->itt, skb, skb->len, skb->data_len, err);
2134
2135 __kfree_skb(skb);
2136
2137 iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2138 iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2139 return err;
2140 }
2141 EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2142
2143 void cxgbi_cleanup_task(struct iscsi_task *task)
2144 {
2145 struct iscsi_tcp_task *tcp_task = task->dd_data;
2146 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2147
2148 if (!tcp_task || !tdata || (tcp_task->dd_data != tdata)) {
2149 pr_info("task 0x%p,0x%p, tcp_task 0x%p, tdata 0x%p/0x%p.\n",
2150 task, task->sc, tcp_task,
2151 tcp_task ? tcp_task->dd_data : NULL, tdata);
2152 return;
2153 }
2154
2155 log_debug(1 << CXGBI_DBG_ISCSI,
2156 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2157 task, tdata->skb, task->hdr_itt);
2158
2159 tcp_task->dd_data = NULL;
2160
2161 if (!task->sc)
2162 kfree(task->hdr);
2163 task->hdr = NULL;
2164
2165 /* never reached the xmit task callout */
2166 if (tdata->skb) {
2167 __kfree_skb(tdata->skb);
2168 tdata->skb = NULL;
2169 }
2170
2171 task_release_itt(task, task->hdr_itt);
2172 memset(tdata, 0, sizeof(*tdata));
2173
2174 iscsi_tcp_cleanup_task(task);
2175 }
2176 EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2177
2178 void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2179 struct iscsi_stats *stats)
2180 {
2181 struct iscsi_conn *conn = cls_conn->dd_data;
2182
2183 stats->txdata_octets = conn->txdata_octets;
2184 stats->rxdata_octets = conn->rxdata_octets;
2185 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2186 stats->dataout_pdus = conn->dataout_pdus_cnt;
2187 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2188 stats->datain_pdus = conn->datain_pdus_cnt;
2189 stats->r2t_pdus = conn->r2t_pdus_cnt;
2190 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2191 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2192 stats->digest_err = 0;
2193 stats->timeout_err = 0;
2194 stats->custom_length = 1;
2195 strcpy(stats->custom[0].desc, "eh_abort_cnt");
2196 stats->custom[0].value = conn->eh_abort_cnt;
2197 }
2198 EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2199
2200 static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2201 {
2202 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2203 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2204 struct cxgbi_device *cdev = cconn->chba->cdev;
2205 unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2206 unsigned int max_def = 512 * MAX_SKB_FRAGS;
2207 unsigned int max = max(max_def, headroom);
2208
2209 max = min(cconn->chba->cdev->tx_max_size, max);
2210 if (conn->max_xmit_dlength)
2211 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2212 else
2213 conn->max_xmit_dlength = max;
2214 cxgbi_align_pdu_size(conn->max_xmit_dlength);
2215
2216 return 0;
2217 }
2218
2219 static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2220 {
2221 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2222 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2223 unsigned int max = cconn->chba->cdev->rx_max_size;
2224
2225 cxgbi_align_pdu_size(max);
2226
2227 if (conn->max_recv_dlength) {
2228 if (conn->max_recv_dlength > max) {
2229 pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2230 conn->max_recv_dlength, max);
2231 return -EINVAL;
2232 }
2233 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2234 cxgbi_align_pdu_size(conn->max_recv_dlength);
2235 } else
2236 conn->max_recv_dlength = max;
2237
2238 return 0;
2239 }
2240
2241 int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2242 enum iscsi_param param, char *buf, int buflen)
2243 {
2244 struct iscsi_conn *conn = cls_conn->dd_data;
2245 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2246 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2247 struct cxgbi_sock *csk = cconn->cep->csk;
2248 int err;
2249
2250 log_debug(1 << CXGBI_DBG_ISCSI,
2251 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2252 cls_conn, param, buflen, buf);
2253
2254 switch (param) {
2255 case ISCSI_PARAM_HDRDGST_EN:
2256 err = iscsi_set_param(cls_conn, param, buf, buflen);
2257 if (!err && conn->hdrdgst_en)
2258 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2259 conn->hdrdgst_en,
2260 conn->datadgst_en);
2261 break;
2262 case ISCSI_PARAM_DATADGST_EN:
2263 err = iscsi_set_param(cls_conn, param, buf, buflen);
2264 if (!err && conn->datadgst_en)
2265 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2266 conn->hdrdgst_en,
2267 conn->datadgst_en);
2268 break;
2269 case ISCSI_PARAM_MAX_R2T:
2270 return iscsi_tcp_set_max_r2t(conn, buf);
2271 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2272 err = iscsi_set_param(cls_conn, param, buf, buflen);
2273 if (!err)
2274 err = cxgbi_conn_max_recv_dlength(conn);
2275 break;
2276 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2277 err = iscsi_set_param(cls_conn, param, buf, buflen);
2278 if (!err)
2279 err = cxgbi_conn_max_xmit_dlength(conn);
2280 break;
2281 default:
2282 return iscsi_set_param(cls_conn, param, buf, buflen);
2283 }
2284 return err;
2285 }
2286 EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2287
2288 int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2289 char *buf)
2290 {
2291 struct cxgbi_endpoint *cep = ep->dd_data;
2292 struct cxgbi_sock *csk;
2293
2294 log_debug(1 << CXGBI_DBG_ISCSI,
2295 "cls_conn 0x%p, param %d.\n", ep, param);
2296
2297 switch (param) {
2298 case ISCSI_PARAM_CONN_PORT:
2299 case ISCSI_PARAM_CONN_ADDRESS:
2300 if (!cep)
2301 return -ENOTCONN;
2302
2303 csk = cep->csk;
2304 if (!csk)
2305 return -ENOTCONN;
2306
2307 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2308 &csk->daddr, param, buf);
2309 default:
2310 break;
2311 }
2312 return -ENOSYS;
2313 }
2314 EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
2315
2316 struct iscsi_cls_conn *
2317 cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2318 {
2319 struct iscsi_cls_conn *cls_conn;
2320 struct iscsi_conn *conn;
2321 struct iscsi_tcp_conn *tcp_conn;
2322 struct cxgbi_conn *cconn;
2323
2324 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2325 if (!cls_conn)
2326 return NULL;
2327
2328 conn = cls_conn->dd_data;
2329 tcp_conn = conn->dd_data;
2330 cconn = tcp_conn->dd_data;
2331 cconn->iconn = conn;
2332
2333 log_debug(1 << CXGBI_DBG_ISCSI,
2334 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2335 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2336
2337 return cls_conn;
2338 }
2339 EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2340
2341 int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2342 struct iscsi_cls_conn *cls_conn,
2343 u64 transport_eph, int is_leading)
2344 {
2345 struct iscsi_conn *conn = cls_conn->dd_data;
2346 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2347 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2348 struct cxgbi_ppm *ppm;
2349 struct iscsi_endpoint *ep;
2350 struct cxgbi_endpoint *cep;
2351 struct cxgbi_sock *csk;
2352 int err;
2353
2354 ep = iscsi_lookup_endpoint(transport_eph);
2355 if (!ep)
2356 return -EINVAL;
2357
2358 /* setup ddp pagesize */
2359 cep = ep->dd_data;
2360 csk = cep->csk;
2361
2362 ppm = csk->cdev->cdev2ppm(csk->cdev);
2363 err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid,
2364 ppm->tformat.pgsz_idx_dflt);
2365 if (err < 0)
2366 return err;
2367
2368 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2369 if (err)
2370 return -EINVAL;
2371
2372 /* calculate the tag idx bits needed for this conn based on cmds_max */
2373 cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2374
2375 write_lock_bh(&csk->callback_lock);
2376 csk->user_data = conn;
2377 cconn->chba = cep->chba;
2378 cconn->cep = cep;
2379 cep->cconn = cconn;
2380 write_unlock_bh(&csk->callback_lock);
2381
2382 cxgbi_conn_max_xmit_dlength(conn);
2383 cxgbi_conn_max_recv_dlength(conn);
2384
2385 log_debug(1 << CXGBI_DBG_ISCSI,
2386 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2387 cls_session, cls_conn, ep, cconn, csk);
2388 /* init recv engine */
2389 iscsi_tcp_hdr_recv_prep(tcp_conn);
2390
2391 return 0;
2392 }
2393 EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2394
2395 struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2396 u16 cmds_max, u16 qdepth,
2397 u32 initial_cmdsn)
2398 {
2399 struct cxgbi_endpoint *cep;
2400 struct cxgbi_hba *chba;
2401 struct Scsi_Host *shost;
2402 struct iscsi_cls_session *cls_session;
2403 struct iscsi_session *session;
2404
2405 if (!ep) {
2406 pr_err("missing endpoint.\n");
2407 return NULL;
2408 }
2409
2410 cep = ep->dd_data;
2411 chba = cep->chba;
2412 shost = chba->shost;
2413
2414 BUG_ON(chba != iscsi_host_priv(shost));
2415
2416 cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2417 cmds_max, 0,
2418 sizeof(struct iscsi_tcp_task) +
2419 sizeof(struct cxgbi_task_data),
2420 initial_cmdsn, ISCSI_MAX_TARGET);
2421 if (!cls_session)
2422 return NULL;
2423
2424 session = cls_session->dd_data;
2425 if (iscsi_tcp_r2tpool_alloc(session))
2426 goto remove_session;
2427
2428 log_debug(1 << CXGBI_DBG_ISCSI,
2429 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2430 return cls_session;
2431
2432 remove_session:
2433 iscsi_session_teardown(cls_session);
2434 return NULL;
2435 }
2436 EXPORT_SYMBOL_GPL(cxgbi_create_session);
2437
2438 void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2439 {
2440 log_debug(1 << CXGBI_DBG_ISCSI,
2441 "cls sess 0x%p.\n", cls_session);
2442
2443 iscsi_tcp_r2tpool_free(cls_session->dd_data);
2444 iscsi_session_teardown(cls_session);
2445 }
2446 EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2447
2448 int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2449 char *buf, int buflen)
2450 {
2451 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2452
2453 if (!chba->ndev) {
2454 shost_printk(KERN_ERR, shost, "Could not get host param. "
2455 "netdev for host not set.\n");
2456 return -ENODEV;
2457 }
2458
2459 log_debug(1 << CXGBI_DBG_ISCSI,
2460 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2461 shost, chba, chba->ndev->name, param, buflen, buf);
2462
2463 switch (param) {
2464 case ISCSI_HOST_PARAM_IPADDRESS:
2465 {
2466 __be32 addr = in_aton(buf);
2467 log_debug(1 << CXGBI_DBG_ISCSI,
2468 "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2469 cxgbi_set_iscsi_ipv4(chba, addr);
2470 return 0;
2471 }
2472 case ISCSI_HOST_PARAM_HWADDRESS:
2473 case ISCSI_HOST_PARAM_NETDEV_NAME:
2474 return 0;
2475 default:
2476 return iscsi_host_set_param(shost, param, buf, buflen);
2477 }
2478 }
2479 EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2480
2481 int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2482 char *buf)
2483 {
2484 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2485 int len = 0;
2486
2487 if (!chba->ndev) {
2488 shost_printk(KERN_ERR, shost, "Could not get host param. "
2489 "netdev for host not set.\n");
2490 return -ENODEV;
2491 }
2492
2493 log_debug(1 << CXGBI_DBG_ISCSI,
2494 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2495 shost, chba, chba->ndev->name, param);
2496
2497 switch (param) {
2498 case ISCSI_HOST_PARAM_HWADDRESS:
2499 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2500 break;
2501 case ISCSI_HOST_PARAM_NETDEV_NAME:
2502 len = sprintf(buf, "%s\n", chba->ndev->name);
2503 break;
2504 case ISCSI_HOST_PARAM_IPADDRESS:
2505 {
2506 struct cxgbi_sock *csk = find_sock_on_port(chba->cdev,
2507 chba->port_id);
2508 if (csk) {
2509 len = sprintf(buf, "%pIS",
2510 (struct sockaddr *)&csk->saddr);
2511 }
2512 log_debug(1 << CXGBI_DBG_ISCSI,
2513 "hba %s, addr %s.\n", chba->ndev->name, buf);
2514 break;
2515 }
2516 default:
2517 return iscsi_host_get_param(shost, param, buf);
2518 }
2519
2520 return len;
2521 }
2522 EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2523
2524 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2525 struct sockaddr *dst_addr,
2526 int non_blocking)
2527 {
2528 struct iscsi_endpoint *ep;
2529 struct cxgbi_endpoint *cep;
2530 struct cxgbi_hba *hba = NULL;
2531 struct cxgbi_sock *csk;
2532 int ifindex = 0;
2533 int err = -EINVAL;
2534
2535 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2536 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2537 shost, non_blocking, dst_addr);
2538
2539 if (shost) {
2540 hba = iscsi_host_priv(shost);
2541 if (!hba) {
2542 pr_info("shost 0x%p, priv NULL.\n", shost);
2543 goto err_out;
2544 }
2545 }
2546
2547 check_route:
2548 if (dst_addr->sa_family == AF_INET) {
2549 csk = cxgbi_check_route(dst_addr, ifindex);
2550 #if IS_ENABLED(CONFIG_IPV6)
2551 } else if (dst_addr->sa_family == AF_INET6) {
2552 csk = cxgbi_check_route6(dst_addr, ifindex);
2553 #endif
2554 } else {
2555 pr_info("address family 0x%x NOT supported.\n",
2556 dst_addr->sa_family);
2557 err = -EAFNOSUPPORT;
2558 return (struct iscsi_endpoint *)ERR_PTR(err);
2559 }
2560
2561 if (IS_ERR(csk))
2562 return (struct iscsi_endpoint *)csk;
2563 cxgbi_sock_get(csk);
2564
2565 if (!hba)
2566 hba = csk->cdev->hbas[csk->port_id];
2567 else if (hba != csk->cdev->hbas[csk->port_id]) {
2568 if (ifindex != hba->ndev->ifindex) {
2569 cxgbi_sock_put(csk);
2570 cxgbi_sock_closed(csk);
2571 ifindex = hba->ndev->ifindex;
2572 goto check_route;
2573 }
2574
2575 pr_info("Could not connect through requested host %u"
2576 "hba 0x%p != 0x%p (%u).\n",
2577 shost->host_no, hba,
2578 csk->cdev->hbas[csk->port_id], csk->port_id);
2579 err = -ENOSPC;
2580 goto release_conn;
2581 }
2582
2583 err = sock_get_port(csk);
2584 if (err)
2585 goto release_conn;
2586
2587 cxgbi_sock_set_state(csk, CTP_CONNECTING);
2588 err = csk->cdev->csk_init_act_open(csk);
2589 if (err)
2590 goto release_conn;
2591
2592 if (cxgbi_sock_is_closing(csk)) {
2593 err = -ENOSPC;
2594 pr_info("csk 0x%p is closing.\n", csk);
2595 goto release_conn;
2596 }
2597
2598 ep = iscsi_create_endpoint(sizeof(*cep));
2599 if (!ep) {
2600 err = -ENOMEM;
2601 pr_info("iscsi alloc ep, OOM.\n");
2602 goto release_conn;
2603 }
2604
2605 cep = ep->dd_data;
2606 cep->csk = csk;
2607 cep->chba = hba;
2608
2609 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2610 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2611 ep, cep, csk, hba, hba->ndev->name);
2612 return ep;
2613
2614 release_conn:
2615 cxgbi_sock_put(csk);
2616 cxgbi_sock_closed(csk);
2617 err_out:
2618 return ERR_PTR(err);
2619 }
2620 EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2621
2622 int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2623 {
2624 struct cxgbi_endpoint *cep = ep->dd_data;
2625 struct cxgbi_sock *csk = cep->csk;
2626
2627 if (!cxgbi_sock_is_established(csk))
2628 return 0;
2629 return 1;
2630 }
2631 EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2632
2633 void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2634 {
2635 struct cxgbi_endpoint *cep = ep->dd_data;
2636 struct cxgbi_conn *cconn = cep->cconn;
2637 struct cxgbi_sock *csk = cep->csk;
2638
2639 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2640 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2641 ep, cep, cconn, csk, csk->state, csk->flags);
2642
2643 if (cconn && cconn->iconn) {
2644 iscsi_suspend_tx(cconn->iconn);
2645 write_lock_bh(&csk->callback_lock);
2646 cep->csk->user_data = NULL;
2647 cconn->cep = NULL;
2648 write_unlock_bh(&csk->callback_lock);
2649 }
2650 iscsi_destroy_endpoint(ep);
2651
2652 if (likely(csk->state >= CTP_ESTABLISHED))
2653 need_active_close(csk);
2654 else
2655 cxgbi_sock_closed(csk);
2656
2657 cxgbi_sock_put(csk);
2658 }
2659 EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2660
2661 int cxgbi_iscsi_init(struct iscsi_transport *itp,
2662 struct scsi_transport_template **stt)
2663 {
2664 *stt = iscsi_register_transport(itp);
2665 if (*stt == NULL) {
2666 pr_err("unable to register %s transport 0x%p.\n",
2667 itp->name, itp);
2668 return -ENODEV;
2669 }
2670 log_debug(1 << CXGBI_DBG_ISCSI,
2671 "%s, registered iscsi transport 0x%p.\n",
2672 itp->name, stt);
2673 return 0;
2674 }
2675 EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2676
2677 void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2678 struct scsi_transport_template **stt)
2679 {
2680 if (*stt) {
2681 log_debug(1 << CXGBI_DBG_ISCSI,
2682 "de-register transport 0x%p, %s, stt 0x%p.\n",
2683 itp, itp->name, *stt);
2684 *stt = NULL;
2685 iscsi_unregister_transport(itp);
2686 }
2687 }
2688 EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2689
2690 umode_t cxgbi_attr_is_visible(int param_type, int param)
2691 {
2692 switch (param_type) {
2693 case ISCSI_HOST_PARAM:
2694 switch (param) {
2695 case ISCSI_HOST_PARAM_NETDEV_NAME:
2696 case ISCSI_HOST_PARAM_HWADDRESS:
2697 case ISCSI_HOST_PARAM_IPADDRESS:
2698 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2699 return S_IRUGO;
2700 default:
2701 return 0;
2702 }
2703 case ISCSI_PARAM:
2704 switch (param) {
2705 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2706 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2707 case ISCSI_PARAM_HDRDGST_EN:
2708 case ISCSI_PARAM_DATADGST_EN:
2709 case ISCSI_PARAM_CONN_ADDRESS:
2710 case ISCSI_PARAM_CONN_PORT:
2711 case ISCSI_PARAM_EXP_STATSN:
2712 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2713 case ISCSI_PARAM_PERSISTENT_PORT:
2714 case ISCSI_PARAM_PING_TMO:
2715 case ISCSI_PARAM_RECV_TMO:
2716 case ISCSI_PARAM_INITIAL_R2T_EN:
2717 case ISCSI_PARAM_MAX_R2T:
2718 case ISCSI_PARAM_IMM_DATA_EN:
2719 case ISCSI_PARAM_FIRST_BURST:
2720 case ISCSI_PARAM_MAX_BURST:
2721 case ISCSI_PARAM_PDU_INORDER_EN:
2722 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2723 case ISCSI_PARAM_ERL:
2724 case ISCSI_PARAM_TARGET_NAME:
2725 case ISCSI_PARAM_TPGT:
2726 case ISCSI_PARAM_USERNAME:
2727 case ISCSI_PARAM_PASSWORD:
2728 case ISCSI_PARAM_USERNAME_IN:
2729 case ISCSI_PARAM_PASSWORD_IN:
2730 case ISCSI_PARAM_FAST_ABORT:
2731 case ISCSI_PARAM_ABORT_TMO:
2732 case ISCSI_PARAM_LU_RESET_TMO:
2733 case ISCSI_PARAM_TGT_RESET_TMO:
2734 case ISCSI_PARAM_IFACE_NAME:
2735 case ISCSI_PARAM_INITIATOR_NAME:
2736 return S_IRUGO;
2737 default:
2738 return 0;
2739 }
2740 }
2741
2742 return 0;
2743 }
2744 EXPORT_SYMBOL_GPL(cxgbi_attr_is_visible);
2745
2746 static int __init libcxgbi_init_module(void)
2747 {
2748 pr_info("%s", version);
2749
2750 BUILD_BUG_ON(sizeof_field(struct sk_buff, cb) <
2751 sizeof(struct cxgbi_skb_cb));
2752 return 0;
2753 }
2754
2755 static void __exit libcxgbi_exit_module(void)
2756 {
2757 cxgbi_device_unregister_all(0xFF);
2758 return;
2759 }
2760
2761 module_init(libcxgbi_init_module);
2762 module_exit(libcxgbi_exit_module);
Linux with added FPC-III support