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9ba682f0 1/*
2 * libcxgbi.c: Chelsio common library for T3/T4 iSCSI driver.
3 *
1149a5ed 4 * Copyright (c) 2010-2015 Chelsio Communications, Inc.
9ba682f0 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>
fc8d0590
AB		 27#include <net/ipv6.h>
28#include <net/ip6_route.h>
29#include <net/addrconf.h>
30
9ba682f0 31#include <linux/inetdevice.h> /* ip_dev_find */
acf3368f 32#include <linux/module.h>
9ba682f0 33#include <net/tcp.h>
34
35static 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"
0ea5bf3d
KX		 41#define DRV_MODULE_VERSION "0.9.1-ko"
42#define DRV_MODULE_RELDATE "Apr. 2015"
43
44static char version[] =
45 DRV_MODULE_DESC " " DRV_MODULE_NAME
46 " v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
9ba682f0 47
48MODULE_AUTHOR("Chelsio Communications, Inc.");
49MODULE_DESCRIPTION(DRV_MODULE_DESC);
50MODULE_VERSION(DRV_MODULE_VERSION);
51MODULE_LICENSE("GPL");
52
53module_param(dbg_level, uint, 0644);
54MODULE_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 */
61static LIST_HEAD(cdev_list);
62static DEFINE_MUTEX(cdev_mutex);
63
576b5863
AB		 64static LIST_HEAD(cdev_rcu_list);
65static DEFINE_SPINLOCK(cdev_rcu_lock);
66
71f7a00b
VP		 67static 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
9ba682f0 75int 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}
93EXPORT_SYMBOL_GPL(cxgbi_device_portmap_create);
94
95void 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}
116EXPORT_SYMBOL_GPL(cxgbi_device_portmap_cleanup);
117
118static 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);
9d5c44b7 124 cxgbi_ppm_release(cdev->cdev2ppm(cdev));
9ba682f0 125 if (cdev->pmap.max_connect)
126 cxgbi_free_big_mem(cdev->pmap.port_csk);
127 kfree(cdev);
128}
129
130struct cxgbi_device *cxgbi_device_register(unsigned int extra,
131 unsigned int nports)
132{
133 struct cxgbi_device *cdev;
134
135 cdev = kzalloc(sizeof(*cdev) + extra + nports *
136 (sizeof(struct cxgbi_hba *) +
137 sizeof(struct net_device *)),
138 GFP_KERNEL);
139 if (!cdev) {
140 pr_warn("nport %d, OOM.\n", nports);
141 return NULL;
142 }
143 cdev->ports = (struct net_device **)(cdev + 1);
144 cdev->hbas = (struct cxgbi_hba **)(((char*)cdev->ports) + nports *
145 sizeof(struct net_device *));
146 if (extra)
147 cdev->dd_data = ((char *)cdev->hbas) +
148 nports * sizeof(struct cxgbi_hba *);
149 spin_lock_init(&cdev->pmap.lock);
150
151 mutex_lock(&cdev_mutex);
152 list_add_tail(&cdev->list_head, &cdev_list);
153 mutex_unlock(&cdev_mutex);
154
576b5863
AB		 155 spin_lock(&cdev_rcu_lock);
156 list_add_tail_rcu(&cdev->rcu_node, &cdev_rcu_list);
157 spin_unlock(&cdev_rcu_lock);
158
9ba682f0 159 log_debug(1 << CXGBI_DBG_DEV,
160 "cdev 0x%p, p# %u.\n", cdev, nports);
161 return cdev;
162}
163EXPORT_SYMBOL_GPL(cxgbi_device_register);
164
165void cxgbi_device_unregister(struct cxgbi_device *cdev)
166{
167 log_debug(1 << CXGBI_DBG_DEV,
168 "cdev 0x%p, p# %u,%s.\n",
169 cdev, cdev->nports, cdev->nports ? cdev->ports[0]->name : "");
576b5863 170
9ba682f0 171 mutex_lock(&cdev_mutex);
172 list_del(&cdev->list_head);
173 mutex_unlock(&cdev_mutex);
576b5863
AB		 174
175 spin_lock(&cdev_rcu_lock);
176 list_del_rcu(&cdev->rcu_node);
177 spin_unlock(&cdev_rcu_lock);
178 synchronize_rcu();
179
9ba682f0 180 cxgbi_device_destroy(cdev);
181}
182EXPORT_SYMBOL_GPL(cxgbi_device_unregister);
183
184void cxgbi_device_unregister_all(unsigned int flag)
185{
186 struct cxgbi_device *cdev, *tmp;
187
188 mutex_lock(&cdev_mutex);
189 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
190 if ((cdev->flags & flag) == flag) {
576b5863
AB		 191 mutex_unlock(&cdev_mutex);
192 cxgbi_device_unregister(cdev);
193 mutex_lock(&cdev_mutex);
9ba682f0 194 }
195 }
196 mutex_unlock(&cdev_mutex);
197}
198EXPORT_SYMBOL_GPL(cxgbi_device_unregister_all);
199
200struct cxgbi_device *cxgbi_device_find_by_lldev(void *lldev)
201{
202 struct cxgbi_device *cdev, *tmp;
203
204 mutex_lock(&cdev_mutex);
205 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
206 if (cdev->lldev == lldev) {
207 mutex_unlock(&cdev_mutex);
208 return cdev;
209 }
210 }
211 mutex_unlock(&cdev_mutex);
576b5863 212
9ba682f0 213 log_debug(1 << CXGBI_DBG_DEV,
214 "lldev 0x%p, NO match found.\n", lldev);
215 return NULL;
216}
217EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev);
218
fc8d0590
AB		 219struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev,
220 int *port)
9ba682f0 221{
0b3d8947 222 struct net_device *vdev = NULL;
9ba682f0 223 struct cxgbi_device *cdev, *tmp;
224 int i;
225
0b3d8947 226 if (ndev->priv_flags & IFF_802_1Q_VLAN) {
227 vdev = ndev;
9ba682f0 228 ndev = vlan_dev_real_dev(ndev);
0b3d8947 229 log_debug(1 << CXGBI_DBG_DEV,
230 "vlan dev %s -> %s.\n", vdev->name, ndev->name);
231 }
9ba682f0 232
233 mutex_lock(&cdev_mutex);
234 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
235 for (i = 0; i < cdev->nports; i++) {
236 if (ndev == cdev->ports[i]) {
0b3d8947 237 cdev->hbas[i]->vdev = vdev;
9ba682f0 238 mutex_unlock(&cdev_mutex);
239 if (port)
240 *port = i;
241 return cdev;
242 }
243 }
244 }
245 mutex_unlock(&cdev_mutex);
246 log_debug(1 << CXGBI_DBG_DEV,
247 "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
248 return NULL;
249}
fc8d0590
AB		 250EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev);
251
576b5863
AB		 252struct cxgbi_device *cxgbi_device_find_by_netdev_rcu(struct net_device *ndev,
253 int *port)
254{
255 struct net_device *vdev = NULL;
256 struct cxgbi_device *cdev;
257 int i;
258
259 if (ndev->priv_flags & IFF_802_1Q_VLAN) {
260 vdev = ndev;
261 ndev = vlan_dev_real_dev(ndev);
262 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
263 }
264
265 rcu_read_lock();
266 list_for_each_entry_rcu(cdev, &cdev_rcu_list, rcu_node) {
267 for (i = 0; i < cdev->nports; i++) {
268 if (ndev == cdev->ports[i]) {
269 cdev->hbas[i]->vdev = vdev;
270 rcu_read_unlock();
271 if (port)
272 *port = i;
273 return cdev;
274 }
275 }
276 }
277 rcu_read_unlock();
278
279 log_debug(1 << CXGBI_DBG_DEV,
280 "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
281 return NULL;
282}
283EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev_rcu);
284
f42bb57c 285#if IS_ENABLED(CONFIG_IPV6)
fc8d0590
AB		 286static 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 (ndev->priv_flags & IFF_802_1Q_VLAN) {
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}
f42bb57c 318#endif
9ba682f0 319
9ba682f0 320void cxgbi_hbas_remove(struct cxgbi_device *cdev)
321{
322 int i;
323 struct cxgbi_hba *chba;
324
325 log_debug(1 << CXGBI_DBG_DEV,
326 "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
327
328 for (i = 0; i < cdev->nports; i++) {
329 chba = cdev->hbas[i];
330 if (chba) {
331 cdev->hbas[i] = NULL;
332 iscsi_host_remove(chba->shost);
333 pci_dev_put(cdev->pdev);
334 iscsi_host_free(chba->shost);
335 }
336 }
337}
338EXPORT_SYMBOL_GPL(cxgbi_hbas_remove);
339
1abf635d 340int cxgbi_hbas_add(struct cxgbi_device *cdev, u64 max_lun,
9ba682f0 341 unsigned int max_id, struct scsi_host_template *sht,
342 struct scsi_transport_template *stt)
343{
344 struct cxgbi_hba *chba;
345 struct Scsi_Host *shost;
346 int i, err;
347
348 log_debug(1 << CXGBI_DBG_DEV, "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
349
350 for (i = 0; i < cdev->nports; i++) {
351 shost = iscsi_host_alloc(sht, sizeof(*chba), 1);
352 if (!shost) {
353 pr_info("0x%p, p%d, %s, host alloc failed.\n",
354 cdev, i, cdev->ports[i]->name);
355 err = -ENOMEM;
356 goto err_out;
357 }
358
359 shost->transportt = stt;
360 shost->max_lun = max_lun;
361 shost->max_id = max_id;
362 shost->max_channel = 0;
363 shost->max_cmd_len = 16;
364
365 chba = iscsi_host_priv(shost);
366 chba->cdev = cdev;
367 chba->ndev = cdev->ports[i];
368 chba->shost = shost;
369
370 log_debug(1 << CXGBI_DBG_DEV,
371 "cdev 0x%p, p#%d %s: chba 0x%p.\n",
372 cdev, i, cdev->ports[i]->name, chba);
373
374 pci_dev_get(cdev->pdev);
375 err = iscsi_host_add(shost, &cdev->pdev->dev);
376 if (err) {
377 pr_info("cdev 0x%p, p#%d %s, host add failed.\n",
378 cdev, i, cdev->ports[i]->name);
379 pci_dev_put(cdev->pdev);
380 scsi_host_put(shost);
381 goto err_out;
382 }
383
384 cdev->hbas[i] = chba;
385 }
386
387 return 0;
388
389err_out:
390 cxgbi_hbas_remove(cdev);
391 return err;
392}
393EXPORT_SYMBOL_GPL(cxgbi_hbas_add);
394
395/*
396 * iSCSI offload
397 *
398 * - source port management
399 * To find a free source port in the port allocation map we use a very simple
400 * rotor scheme to look for the next free port.
401 *
402 * If a source port has been specified make sure that it doesn't collide with
403 * our normal source port allocation map. If it's outside the range of our
404 * allocation/deallocation scheme just let them use it.
405 *
406 * If the source port is outside our allocation range, the caller is
407 * responsible for keeping track of their port usage.
408 */
dd9ad67e
AB		 409
410static struct cxgbi_sock *find_sock_on_port(struct cxgbi_device *cdev,
411 unsigned char port_id)
412{
413 struct cxgbi_ports_map *pmap = &cdev->pmap;
414 unsigned int i;
415 unsigned int used;
416
417 if (!pmap->max_connect || !pmap->used)
418 return NULL;
419
420 spin_lock_bh(&pmap->lock);
421 used = pmap->used;
422 for (i = 0; used && i < pmap->max_connect; i++) {
423 struct cxgbi_sock *csk = pmap->port_csk[i];
424
425 if (csk) {
426 if (csk->port_id == port_id) {
427 spin_unlock_bh(&pmap->lock);
428 return csk;
429 }
430 used--;
431 }
432 }
433 spin_unlock_bh(&pmap->lock);
434
435 return NULL;
436}
437
9ba682f0 438static int sock_get_port(struct cxgbi_sock *csk)
439{
440 struct cxgbi_device *cdev = csk->cdev;
441 struct cxgbi_ports_map *pmap = &cdev->pmap;
442 unsigned int start;
443 int idx;
fc8d0590 444 __be16 *port;
9ba682f0 445
446 if (!pmap->max_connect) {
447 pr_err("cdev 0x%p, p#%u %s, NO port map.\n",
448 cdev, csk->port_id, cdev->ports[csk->port_id]->name);
449 return -EADDRNOTAVAIL;
450 }
451
fc8d0590
AB		 452 if (csk->csk_family == AF_INET)
453 port = &csk->saddr.sin_port;
454 else /* ipv6 */
455 port = &csk->saddr6.sin6_port;
456
457 if (*port) {
9ba682f0 458 pr_err("source port NON-ZERO %u.\n",
fc8d0590 459 ntohs(*port));
9ba682f0 460 return -EADDRINUSE;
461 }
462
463 spin_lock_bh(&pmap->lock);
464 if (pmap->used >= pmap->max_connect) {
465 spin_unlock_bh(&pmap->lock);
466 pr_info("cdev 0x%p, p#%u %s, ALL ports used.\n",
467 cdev, csk->port_id, cdev->ports[csk->port_id]->name);
468 return -EADDRNOTAVAIL;
469 }
470
471 start = idx = pmap->next;
472 do {
473 if (++idx >= pmap->max_connect)
474 idx = 0;
475 if (!pmap->port_csk[idx]) {
476 pmap->used++;
fc8d0590 477 *port = htons(pmap->sport_base + idx);
9ba682f0 478 pmap->next = idx;
479 pmap->port_csk[idx] = csk;
480 spin_unlock_bh(&pmap->lock);
481 cxgbi_sock_get(csk);
482 log_debug(1 << CXGBI_DBG_SOCK,
483 "cdev 0x%p, p#%u %s, p %u, %u.\n",
484 cdev, csk->port_id,
485 cdev->ports[csk->port_id]->name,
486 pmap->sport_base + idx, pmap->next);
487 return 0;
488 }
489 } while (idx != start);
490 spin_unlock_bh(&pmap->lock);
491
492 /* should not happen */
493 pr_warn("cdev 0x%p, p#%u %s, next %u?\n",
494 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
495 pmap->next);
496 return -EADDRNOTAVAIL;
497}
498
499static void sock_put_port(struct cxgbi_sock *csk)
500{
501 struct cxgbi_device *cdev = csk->cdev;
502 struct cxgbi_ports_map *pmap = &cdev->pmap;
fc8d0590 503 __be16 *port;
9ba682f0 504
fc8d0590
AB		 505 if (csk->csk_family == AF_INET)
506 port = &csk->saddr.sin_port;
507 else /* ipv6 */
508 port = &csk->saddr6.sin6_port;
9ba682f0 509
fc8d0590
AB		 510 if (*port) {
511 int idx = ntohs(*port) - pmap->sport_base;
512
513 *port = 0;
9ba682f0 514 if (idx < 0 || idx >= pmap->max_connect) {
515 pr_err("cdev 0x%p, p#%u %s, port %u OOR.\n",
516 cdev, csk->port_id,
517 cdev->ports[csk->port_id]->name,
fc8d0590 518 ntohs(*port));
9ba682f0 519 return;
520 }
521
522 spin_lock_bh(&pmap->lock);
523 pmap->port_csk[idx] = NULL;
524 pmap->used--;
525 spin_unlock_bh(&pmap->lock);
526
527 log_debug(1 << CXGBI_DBG_SOCK,
528 "cdev 0x%p, p#%u %s, release %u.\n",
529 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
530 pmap->sport_base + idx);
531
532 cxgbi_sock_put(csk);
533 }
534}
535
536/*
537 * iscsi tcp connection
538 */
539void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *csk)
540{
541 if (csk->cpl_close) {
542 kfree_skb(csk->cpl_close);
543 csk->cpl_close = NULL;
544 }
545 if (csk->cpl_abort_req) {
546 kfree_skb(csk->cpl_abort_req);
547 csk->cpl_abort_req = NULL;
548 }
549 if (csk->cpl_abort_rpl) {
550 kfree_skb(csk->cpl_abort_rpl);
551 csk->cpl_abort_rpl = NULL;
552 }
553}
554EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs);
555
556static struct cxgbi_sock *cxgbi_sock_create(struct cxgbi_device *cdev)
557{
558 struct cxgbi_sock *csk = kzalloc(sizeof(*csk), GFP_NOIO);
559
560 if (!csk) {
561 pr_info("alloc csk %zu failed.\n", sizeof(*csk));
562 return NULL;
563 }
564
565 if (cdev->csk_alloc_cpls(csk) < 0) {
566 pr_info("csk 0x%p, alloc cpls failed.\n", csk);
567 kfree(csk);
568 return NULL;
569 }
570
571 spin_lock_init(&csk->lock);
572 kref_init(&csk->refcnt);
573 skb_queue_head_init(&csk->receive_queue);
574 skb_queue_head_init(&csk->write_queue);
575 setup_timer(&csk->retry_timer, NULL, (unsigned long)csk);
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
f4bfd99f
DM		 586static struct rtable *find_route_ipv4(struct flowi4 *fl4,
587 __be32 saddr, __be32 daddr,
78fbfd8a 588 __be16 sport, __be16 dport, u8 tos)
9ba682f0 589{
590 struct rtable *rt;
9ba682f0 591
f4bfd99f 592 rt = ip_route_output_ports(&init_net, fl4, NULL, daddr, saddr,
78fbfd8a 593 dport, sport, IPPROTO_TCP, tos, 0);
b23dd4fe 594 if (IS_ERR(rt))
9ba682f0 595 return NULL;
596
597 return rt;
598}
599
600static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr)
601{
602 struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
603 struct dst_entry *dst;
604 struct net_device *ndev;
605 struct cxgbi_device *cdev;
606 struct rtable *rt = NULL;
a58b61e5 607 struct neighbour *n;
f4bfd99f 608 struct flowi4 fl4;
9ba682f0 609 struct cxgbi_sock *csk = NULL;
610 unsigned int mtu = 0;
611 int port = 0xFFFF;
612 int err = 0;
613
f4bfd99f 614 rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0, daddr->sin_port, 0);
9ba682f0 615 if (!rt) {
616 pr_info("no route to ipv4 0x%x, port %u.\n",
fc8d0590
AB		 617 be32_to_cpu(daddr->sin_addr.s_addr),
618 be16_to_cpu(daddr->sin_port));
9ba682f0 619 err = -ENETUNREACH;
620 goto err_out;
621 }
622 dst = &rt->dst;
0b399d46 623 n = dst_neigh_lookup(dst, &daddr->sin_addr.s_addr);
a58b61e5
DM		 624 if (!n) {
625 err = -ENODEV;
626 goto rel_rt;
627 }
628 ndev = n->dev;
9ba682f0 629
630 if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
631 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
632 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
633 ndev->name);
634 err = -ENETUNREACH;
0b399d46 635 goto rel_neigh;
9ba682f0 636 }
637
638 if (ndev->flags & IFF_LOOPBACK) {
639 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
640 mtu = ndev->mtu;
641 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
a58b61e5 642 n->dev->name, ndev->name, mtu);
9ba682f0 643 }
644
165ae50e
VP		 645 if (!(ndev->flags & IFF_UP) || !netif_carrier_ok(ndev)) {
646 pr_info("%s interface not up.\n", ndev->name);
647 err = -ENETDOWN;
648 goto rel_neigh;
649 }
650
9ba682f0 651 cdev = cxgbi_device_find_by_netdev(ndev, &port);
652 if (!cdev) {
653 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
654 &daddr->sin_addr.s_addr, ndev->name);
655 err = -ENETUNREACH;
0b399d46 656 goto rel_neigh;
9ba682f0 657 }
658 log_debug(1 << CXGBI_DBG_SOCK,
659 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
660 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
661 port, ndev->name, cdev);
662
663 csk = cxgbi_sock_create(cdev);
664 if (!csk) {
665 err = -ENOMEM;
0b399d46 666 goto rel_neigh;
9ba682f0 667 }
668 csk->cdev = cdev;
669 csk->port_id = port;
670 csk->mtu = mtu;
671 csk->dst = dst;
fc8d0590
AB		 672
673 csk->csk_family = AF_INET;
9ba682f0 674 csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
675 csk->daddr.sin_port = daddr->sin_port;
c71b9b66 676 csk->daddr.sin_family = daddr->sin_family;
fc8d0590 677 csk->saddr.sin_family = daddr->sin_family;
f4bfd99f 678 csk->saddr.sin_addr.s_addr = fl4.saddr;
0b399d46 679 neigh_release(n);
9ba682f0 680
681 return csk;
682
0b399d46
DM		 683rel_neigh:
684 neigh_release(n);
685
9ba682f0 686rel_rt:
687 ip_rt_put(rt);
688 if (csk)
689 cxgbi_sock_closed(csk);
690err_out:
691 return ERR_PTR(err);
692}
693
e81fbf6c 694#if IS_ENABLED(CONFIG_IPV6)
fc8d0590
AB		 695static struct rt6_info *find_route_ipv6(const struct in6_addr *saddr,
696 const struct in6_addr *daddr)
697{
698 struct flowi6 fl;
699
3d6d30d6 700 memset(&fl, 0, sizeof(fl));
fc8d0590
AB		 701 if (saddr)
702 memcpy(&fl.saddr, saddr, sizeof(struct in6_addr));
703 if (daddr)
704 memcpy(&fl.daddr, daddr, sizeof(struct in6_addr));
705 return (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl);
706}
707
708static struct cxgbi_sock *cxgbi_check_route6(struct sockaddr *dst_addr)
709{
710 struct sockaddr_in6 *daddr6 = (struct sockaddr_in6 *)dst_addr;
711 struct dst_entry *dst;
712 struct net_device *ndev;
713 struct cxgbi_device *cdev;
714 struct rt6_info *rt = NULL;
715 struct neighbour *n;
716 struct in6_addr pref_saddr;
717 struct cxgbi_sock *csk = NULL;
718 unsigned int mtu = 0;
719 int port = 0xFFFF;
720 int err = 0;
721
722 rt = find_route_ipv6(NULL, &daddr6->sin6_addr);
723
724 if (!rt) {
725 pr_info("no route to ipv6 %pI6 port %u\n",
726 daddr6->sin6_addr.s6_addr,
727 be16_to_cpu(daddr6->sin6_port));
728 err = -ENETUNREACH;
729 goto err_out;
730 }
731
732 dst = &rt->dst;
733
734 n = dst_neigh_lookup(dst, &daddr6->sin6_addr);
735
736 if (!n) {
737 pr_info("%pI6, port %u, dst no neighbour.\n",
738 daddr6->sin6_addr.s6_addr,
739 be16_to_cpu(daddr6->sin6_port));
740 err = -ENETUNREACH;
741 goto rel_rt;
742 }
743 ndev = n->dev;
744
165ae50e
VP		 745 if (!(ndev->flags & IFF_UP) || !netif_carrier_ok(ndev)) {
746 pr_info("%s interface not up.\n", ndev->name);
747 err = -ENETDOWN;
748 goto rel_rt;
749 }
750
fd0273d7 751 if (ipv6_addr_is_multicast(&daddr6->sin6_addr)) {
fc8d0590
AB		 752 pr_info("multi-cast route %pI6 port %u, dev %s.\n",
753 daddr6->sin6_addr.s6_addr,
754 ntohs(daddr6->sin6_port), ndev->name);
755 err = -ENETUNREACH;
756 goto rel_rt;
757 }
758
759 cdev = cxgbi_device_find_by_netdev(ndev, &port);
760 if (!cdev)
761 cdev = cxgbi_device_find_by_mac(ndev, &port);
762 if (!cdev) {
763 pr_info("dst %pI6 %s, NOT cxgbi device.\n",
764 daddr6->sin6_addr.s6_addr, ndev->name);
765 err = -ENETUNREACH;
766 goto rel_rt;
767 }
768 log_debug(1 << CXGBI_DBG_SOCK,
769 "route to %pI6 :%u, ndev p#%d,%s, cdev 0x%p.\n",
770 daddr6->sin6_addr.s6_addr, ntohs(daddr6->sin6_port), port,
771 ndev->name, cdev);
772
773 csk = cxgbi_sock_create(cdev);
774 if (!csk) {
775 err = -ENOMEM;
776 goto rel_rt;
777 }
778 csk->cdev = cdev;
779 csk->port_id = port;
780 csk->mtu = mtu;
781 csk->dst = dst;
782
783 if (ipv6_addr_any(&rt->rt6i_prefsrc.addr)) {
784 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry *)rt);
785
786 err = ipv6_dev_get_saddr(&init_net, idev ? idev->dev : NULL,
787 &daddr6->sin6_addr, 0, &pref_saddr);
788 if (err) {
789 pr_info("failed to get source address to reach %pI6\n",
790 &daddr6->sin6_addr);
791 goto rel_rt;
792 }
793 } else {
794 pref_saddr = rt->rt6i_prefsrc.addr;
795 }
796
797 csk->csk_family = AF_INET6;
798 csk->daddr6.sin6_addr = daddr6->sin6_addr;
799 csk->daddr6.sin6_port = daddr6->sin6_port;
800 csk->daddr6.sin6_family = daddr6->sin6_family;
dd9ad67e 801 csk->saddr6.sin6_family = daddr6->sin6_family;
fc8d0590
AB		 802 csk->saddr6.sin6_addr = pref_saddr;
803
804 neigh_release(n);
805 return csk;
806
807rel_rt:
808 if (n)
809 neigh_release(n);
810
811 ip6_rt_put(rt);
812 if (csk)
813 cxgbi_sock_closed(csk);
814err_out:
815 return ERR_PTR(err);
816}
e81fbf6c 817#endif /* IS_ENABLED(CONFIG_IPV6) */
fc8d0590 818
9ba682f0 819void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
820 unsigned int opt)
821{
822 csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
823 dst_confirm(csk->dst);
824 smp_mb();
825 cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
826}
827EXPORT_SYMBOL_GPL(cxgbi_sock_established);
828
829static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
830{
831 log_debug(1 << CXGBI_DBG_SOCK,
832 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
833 csk, csk->state, csk->flags, csk->user_data);
834
835 if (csk->state != CTP_ESTABLISHED) {
e3d2ad8c 836 read_lock_bh(&csk->callback_lock);
9ba682f0 837 if (csk->user_data)
838 iscsi_conn_failure(csk->user_data,
ee7255ad 839 ISCSI_ERR_TCP_CONN_CLOSE);
e3d2ad8c 840 read_unlock_bh(&csk->callback_lock);
9ba682f0 841 }
842}
843
844void cxgbi_sock_closed(struct cxgbi_sock *csk)
845{
846 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
847 csk, (csk)->state, (csk)->flags, (csk)->tid);
848 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
849 if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
850 return;
851 if (csk->saddr.sin_port)
852 sock_put_port(csk);
853 if (csk->dst)
854 dst_release(csk->dst);
855 csk->cdev->csk_release_offload_resources(csk);
856 cxgbi_sock_set_state(csk, CTP_CLOSED);
857 cxgbi_inform_iscsi_conn_closing(csk);
858 cxgbi_sock_put(csk);
859}
860EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
861
862static void need_active_close(struct cxgbi_sock *csk)
863{
864 int data_lost;
865 int close_req = 0;
866
867 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
868 csk, (csk)->state, (csk)->flags, (csk)->tid);
869 spin_lock_bh(&csk->lock);
870 dst_confirm(csk->dst);
871 data_lost = skb_queue_len(&csk->receive_queue);
872 __skb_queue_purge(&csk->receive_queue);
873
874 if (csk->state == CTP_ACTIVE_OPEN)
875 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
876 else if (csk->state == CTP_ESTABLISHED) {
877 close_req = 1;
878 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
879 } else if (csk->state == CTP_PASSIVE_CLOSE) {
880 close_req = 1;
881 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
882 }
883
884 if (close_req) {
885 if (data_lost)
886 csk->cdev->csk_send_abort_req(csk);
887 else
888 csk->cdev->csk_send_close_req(csk);
889 }
890
891 spin_unlock_bh(&csk->lock);
892}
893
894void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
895{
896 pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
897 csk, csk->state, csk->flags,
898 &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
899 &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
900 errno);
901
902 cxgbi_sock_set_state(csk, CTP_CONNECTING);
903 csk->err = errno;
904 cxgbi_sock_closed(csk);
905}
906EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
907
908void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
909{
910 struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
1fe1fdb0 911 struct module *owner = csk->cdev->owner;
9ba682f0 912
913 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
914 csk, (csk)->state, (csk)->flags, (csk)->tid);
915 cxgbi_sock_get(csk);
916 spin_lock_bh(&csk->lock);
917 if (csk->state == CTP_ACTIVE_OPEN)
918 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
919 spin_unlock_bh(&csk->lock);
920 cxgbi_sock_put(csk);
921 __kfree_skb(skb);
1fe1fdb0
VP		 922
923 module_put(owner);
9ba682f0 924}
925EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
926
927void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
928{
929 cxgbi_sock_get(csk);
930 spin_lock_bh(&csk->lock);
7b07bf24
AB		 931
932 cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
9ba682f0 933 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
7b07bf24
AB		 934 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
935 if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
936 pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
937 csk, csk->state, csk->flags, csk->tid);
938 cxgbi_sock_closed(csk);
9ba682f0 939 }
7b07bf24 940
9ba682f0 941 spin_unlock_bh(&csk->lock);
942 cxgbi_sock_put(csk);
943}
944EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
945
946void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
947{
948 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
949 csk, (csk)->state, (csk)->flags, (csk)->tid);
950 cxgbi_sock_get(csk);
951 spin_lock_bh(&csk->lock);
952
953 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
954 goto done;
955
956 switch (csk->state) {
957 case CTP_ESTABLISHED:
958 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
959 break;
960 case CTP_ACTIVE_CLOSE:
961 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
962 break;
963 case CTP_CLOSE_WAIT_1:
964 cxgbi_sock_closed(csk);
965 break;
966 case CTP_ABORTING:
967 break;
968 default:
969 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
970 csk, csk->state, csk->flags, csk->tid);
971 }
972 cxgbi_inform_iscsi_conn_closing(csk);
973done:
974 spin_unlock_bh(&csk->lock);
975 cxgbi_sock_put(csk);
976}
977EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
978
979void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
980{
981 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
982 csk, (csk)->state, (csk)->flags, (csk)->tid);
983 cxgbi_sock_get(csk);
984 spin_lock_bh(&csk->lock);
985
986 csk->snd_una = snd_nxt - 1;
987 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
988 goto done;
989
990 switch (csk->state) {
991 case CTP_ACTIVE_CLOSE:
992 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
993 break;
994 case CTP_CLOSE_WAIT_1:
995 case CTP_CLOSE_WAIT_2:
996 cxgbi_sock_closed(csk);
997 break;
998 case CTP_ABORTING:
999 break;
1000 default:
1001 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
1002 csk, csk->state, csk->flags, csk->tid);
1003 }
1004done:
1005 spin_unlock_bh(&csk->lock);
1006 cxgbi_sock_put(csk);
1007}
1008EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
1009
1010void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
1011 unsigned int snd_una, int seq_chk)
1012{
1013 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1014 "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
1015 csk, csk->state, csk->flags, csk->tid, credits,
1016 csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
1017
1018 spin_lock_bh(&csk->lock);
1019
1020 csk->wr_cred += credits;
1021 if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
1022 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
1023
1024 while (credits) {
1025 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
1026
1027 if (unlikely(!p)) {
1028 pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
1029 csk, csk->state, csk->flags, csk->tid, credits,
1030 csk->wr_cred, csk->wr_una_cred);
1031 break;
1032 }
1033
1034 if (unlikely(credits < p->csum)) {
1035 pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
1036 csk, csk->state, csk->flags, csk->tid,
1037 credits, csk->wr_cred, csk->wr_una_cred,
1038 p->csum);
1039 p->csum -= credits;
1040 break;
1041 } else {
1042 cxgbi_sock_dequeue_wr(csk);
1043 credits -= p->csum;
1044 kfree_skb(p);
1045 }
1046 }
1047
1048 cxgbi_sock_check_wr_invariants(csk);
1049
1050 if (seq_chk) {
1051 if (unlikely(before(snd_una, csk->snd_una))) {
1052 pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
1053 csk, csk->state, csk->flags, csk->tid, snd_una,
1054 csk->snd_una);
1055 goto done;
1056 }
1057
1058 if (csk->snd_una != snd_una) {
1059 csk->snd_una = snd_una;
1060 dst_confirm(csk->dst);
1061 }
1062 }
1063
1064 if (skb_queue_len(&csk->write_queue)) {
1065 if (csk->cdev->csk_push_tx_frames(csk, 0))
1066 cxgbi_conn_tx_open(csk);
1067 } else
1068 cxgbi_conn_tx_open(csk);
1069done:
1070 spin_unlock_bh(&csk->lock);
1071}
1072EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
1073
1074static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
1075 unsigned short mtu)
1076{
1077 int i = 0;
1078
1079 while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
1080 ++i;
1081
1082 return i;
1083}
1084
1085unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
1086{
1087 unsigned int idx;
1088 struct dst_entry *dst = csk->dst;
1089
0dbaee3b 1090 csk->advmss = dst_metric_advmss(dst);
9ba682f0 1091
1092 if (csk->advmss > pmtu - 40)
1093 csk->advmss = pmtu - 40;
1094 if (csk->advmss < csk->cdev->mtus[0] - 40)
1095 csk->advmss = csk->cdev->mtus[0] - 40;
1096 idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
1097
1098 return idx;
1099}
1100EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
1101
1102void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
1103{
1104 cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
1105 __skb_queue_tail(&csk->write_queue, skb);
1106}
1107EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
1108
1109void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
1110{
1111 struct sk_buff *skb;
1112
1113 while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
1114 kfree_skb(skb);
1115}
1116EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
1117
1118void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
1119{
1120 int pending = cxgbi_sock_count_pending_wrs(csk);
1121
1122 if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
1123 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
1124 csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
1125}
1126EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
1127
1128static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
1129{
1130 struct cxgbi_device *cdev = csk->cdev;
1131 struct sk_buff *next;
1132 int err, copied = 0;
1133
1134 spin_lock_bh(&csk->lock);
1135
1136 if (csk->state != CTP_ESTABLISHED) {
1137 log_debug(1 << CXGBI_DBG_PDU_TX,
1138 "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
1139 csk, csk->state, csk->flags, csk->tid);
1140 err = -EAGAIN;
1141 goto out_err;
1142 }
1143
1144 if (csk->err) {
1145 log_debug(1 << CXGBI_DBG_PDU_TX,
1146 "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
1147 csk, csk->state, csk->flags, csk->tid, csk->err);
1148 err = -EPIPE;
1149 goto out_err;
1150 }
1151
81daf10c 1152 if (csk->write_seq - csk->snd_una >= csk->snd_win) {
9ba682f0 1153 log_debug(1 << CXGBI_DBG_PDU_TX,
1154 "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
1155 csk, csk->state, csk->flags, csk->tid, csk->write_seq,
81daf10c 1156 csk->snd_una, csk->snd_win);
9ba682f0 1157 err = -ENOBUFS;
1158 goto out_err;
1159 }
1160
1161 while (skb) {
1162 int frags = skb_shinfo(skb)->nr_frags +
1163 (skb->len != skb->data_len);
1164
1165 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
1166 pr_err("csk 0x%p, skb head %u < %u.\n",
1167 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
1168 err = -EINVAL;
1169 goto out_err;
1170 }
1171
1172 if (frags >= SKB_WR_LIST_SIZE) {
1173 pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
1174 csk, skb_shinfo(skb)->nr_frags, skb->len,
1175 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
1176 err = -EINVAL;
1177 goto out_err;
1178 }
1179
1180 next = skb->next;
1181 skb->next = NULL;
1182 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
1183 cxgbi_sock_skb_entail(csk, skb);
1184 copied += skb->len;
1185 csk->write_seq += skb->len +
1186 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
1187 skb = next;
1188 }
1189done:
1190 if (likely(skb_queue_len(&csk->write_queue)))
1191 cdev->csk_push_tx_frames(csk, 1);
1192 spin_unlock_bh(&csk->lock);
1193 return copied;
1194
1195out_err:
1196 if (copied == 0 && err == -EPIPE)
1197 copied = csk->err ? csk->err : -EPIPE;
1198 else
1199 copied = err;
1200 goto done;
1201}
1202
71f7a00b
VP		 1203static inline void
1204scmd_get_params(struct scsi_cmnd *sc, struct scatterlist **sgl,
1205 unsigned int *sgcnt, unsigned int *dlen,
1206 unsigned int prot)
1207{
1208 struct scsi_data_buffer *sdb = prot ? scsi_prot(sc) : scsi_out(sc);
1209
1210 *sgl = sdb->table.sgl;
1211 *sgcnt = sdb->table.nents;
1212 *dlen = sdb->length;
1213 /* Caution: for protection sdb, sdb->length is invalid */
1214}
1215
1216void cxgbi_ddp_set_one_ppod(struct cxgbi_pagepod *ppod,
1217 struct cxgbi_task_tag_info *ttinfo,
1218 struct scatterlist **sg_pp, unsigned int *sg_off)
1219{
1220 struct scatterlist *sg = sg_pp ? *sg_pp : NULL;
1221 unsigned int offset = sg_off ? *sg_off : 0;
1222 dma_addr_t addr = 0UL;
1223 unsigned int len = 0;
1224 int i;
1225
1226 memcpy(ppod, &ttinfo->hdr, sizeof(struct cxgbi_pagepod_hdr));
1227
1228 if (sg) {
1229 addr = sg_dma_address(sg);
1230 len = sg_dma_len(sg);
1231 }
1232
1233 for (i = 0; i < PPOD_PAGES_MAX; i++) {
1234 if (sg) {
1235 ppod->addr[i] = cpu_to_be64(addr + offset);
1236 offset += PAGE_SIZE;
1237 if (offset == (len + sg->offset)) {
1238 offset = 0;
1239 sg = sg_next(sg);
1240 if (sg) {
1241 addr = sg_dma_address(sg);
1242 len = sg_dma_len(sg);
1243 }
1244 }
1245 } else {
1246 ppod->addr[i] = 0ULL;
1247 }
1248 }
1249
1250 /*
1251 * the fifth address needs to be repeated in the next ppod, so do
1252 * not move sg
1253 */
1254 if (sg_pp) {
1255 *sg_pp = sg;
1256 *sg_off = offset;
1257 }
1258
1259 if (offset == len) {
1260 offset = 0;
1261 sg = sg_next(sg);
1262 if (sg) {
1263 addr = sg_dma_address(sg);
1264 len = sg_dma_len(sg);
1265 }
1266 }
1267 ppod->addr[i] = sg ? cpu_to_be64(addr + offset) : 0ULL;
1268}
1269EXPORT_SYMBOL_GPL(cxgbi_ddp_set_one_ppod);
1270
9ba682f0 1271/*
1272 * APIs interacting with open-iscsi libraries
1273 */
1274
1275static unsigned char padding[4];
1276
71f7a00b
VP		 1277void cxgbi_ddp_ppm_setup(void **ppm_pp, struct cxgbi_device *cdev,
1278 struct cxgbi_tag_format *tformat, unsigned int ppmax,
1279 unsigned int llimit, unsigned int start,
1280 unsigned int rsvd_factor)
1281{
1282 int err = cxgbi_ppm_init(ppm_pp, cdev->ports[0], cdev->pdev,
1283 cdev->lldev, tformat, ppmax, llimit, start,
1284 rsvd_factor);
1285
1286 if (err >= 0) {
1287 struct cxgbi_ppm *ppm = (struct cxgbi_ppm *)(*ppm_pp);
1288
1289 if (ppm->ppmax < 1024 ||
1290 ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX)
1291 cdev->flags |= CXGBI_FLAG_DDP_OFF;
1292 err = 0;
1293 } else {
1294 cdev->flags |= CXGBI_FLAG_DDP_OFF;
1295 }
1296}
1297EXPORT_SYMBOL_GPL(cxgbi_ddp_ppm_setup);
1298
1299static int cxgbi_ddp_sgl_check(struct scatterlist *sgl, int nents)
1300{
1301 int i;
1302 int last_sgidx = nents - 1;
1303 struct scatterlist *sg = sgl;
1304
1305 for (i = 0; i < nents; i++, sg = sg_next(sg)) {
1306 unsigned int len = sg->length + sg->offset;
1307
1308 if ((sg->offset & 0x3) || (i && sg->offset) ||
1309 ((i != last_sgidx) && len != PAGE_SIZE)) {
1310 log_debug(1 << CXGBI_DBG_DDP,
1311 "sg %u/%u, %u,%u, not aligned.\n",
1312 i, nents, sg->offset, sg->length);
1313 goto err_out;
1314 }
1315 }
1316 return 0;
1317err_out:
1318 return -EINVAL;
1319}
1320
1321static int cxgbi_ddp_reserve(struct cxgbi_conn *cconn,
1322 struct cxgbi_task_data *tdata, u32 sw_tag,
1323 unsigned int xferlen)
1324{
1325 struct cxgbi_sock *csk = cconn->cep->csk;
1326 struct cxgbi_device *cdev = csk->cdev;
1327 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1328 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1329 struct scatterlist *sgl = ttinfo->sgl;
1330 unsigned int sgcnt = ttinfo->nents;
1331 unsigned int sg_offset = sgl->offset;
1332 int err;
1333
1334 if (cdev->flags & CXGBI_FLAG_DDP_OFF) {
1335 log_debug(1 << CXGBI_DBG_DDP,
1336 "cdev 0x%p DDP off.\n", cdev);
1337 return -EINVAL;
1338 }
1339
1340 if (!ppm || xferlen < DDP_THRESHOLD || !sgcnt ||
1341 ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX) {
1342 log_debug(1 << CXGBI_DBG_DDP,
1343 "ppm 0x%p, pgidx %u, xfer %u, sgcnt %u, NO ddp.\n",
1344 ppm, ppm ? ppm->tformat.pgsz_idx_dflt : DDP_PGIDX_MAX,
1345 xferlen, ttinfo->nents);
1346 return -EINVAL;
1347 }
1348
1349 /* make sure the buffer is suitable for ddp */
1350 if (cxgbi_ddp_sgl_check(sgl, sgcnt) < 0)
1351 return -EINVAL;
1352
1353 ttinfo->nr_pages = (xferlen + sgl->offset + (1 << PAGE_SHIFT) - 1) >>
1354 PAGE_SHIFT;
1355
1356 /*
1357 * the ddp tag will be used for the itt in the outgoing pdu,
1358 * the itt genrated by libiscsi is saved in the ppm and can be
1359 * retrieved via the ddp tag
1360 */
1361 err = cxgbi_ppm_ppods_reserve(ppm, ttinfo->nr_pages, 0, &ttinfo->idx,
1362 &ttinfo->tag, (unsigned long)sw_tag);
1363 if (err < 0) {
1364 cconn->ddp_full++;
1365 return err;
1366 }
1367 ttinfo->npods = err;
1368
1369 /* setup dma from scsi command sgl */
1370 sgl->offset = 0;
1371 err = dma_map_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1372 sgl->offset = sg_offset;
1373 if (err == 0) {
1374 pr_info("%s: 0x%x, xfer %u, sgl %u dma mapping err.\n",
1375 __func__, sw_tag, xferlen, sgcnt);
1376 goto rel_ppods;
1377 }
1378 if (err != ttinfo->nr_pages) {
1379 log_debug(1 << CXGBI_DBG_DDP,
1380 "%s: sw tag 0x%x, xfer %u, sgl %u, dma count %d.\n",
1381 __func__, sw_tag, xferlen, sgcnt, err);
1382 }
1383
1384 ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_MAPPED;
1385 ttinfo->cid = csk->port_id;
1386
1387 cxgbi_ppm_make_ppod_hdr(ppm, ttinfo->tag, csk->tid, sgl->offset,
1388 xferlen, &ttinfo->hdr);
1389
1390 if (cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ) {
1391 /* write ppod from xmit_pdu (of iscsi_scsi_command pdu) */
1392 ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_VALID;
1393 } else {
1394 /* write ppod from control queue now */
1395 err = cdev->csk_ddp_set_map(ppm, csk, ttinfo);
1396 if (err < 0)
1397 goto rel_ppods;
1398 }
1399
1400 return 0;
1401
1402rel_ppods:
1403 cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1404
1405 if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_MAPPED) {
1406 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_MAPPED;
1407 dma_unmap_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1408 }
1409 return -EINVAL;
1410}
1411
9ba682f0 1412static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1413{
71f7a00b
VP		 1414 struct scsi_cmnd *sc = task->sc;
1415 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1416 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1417 struct cxgbi_device *cdev = cconn->chba->cdev;
1418 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1419 u32 tag = ntohl((__force u32)hdr_itt);
1420
1421 log_debug(1 << CXGBI_DBG_DDP,
1422 "cdev 0x%p, task 0x%p, release tag 0x%x.\n",
1423 cdev, task, tag);
1424 if (sc &&
1425 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
1426 cxgbi_ppm_is_ddp_tag(ppm, tag)) {
1427 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1428 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1429
1430 if (!(cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ))
1431 cdev->csk_ddp_clear_map(cdev, ppm, ttinfo);
1432 cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1433 dma_unmap_sg(&ppm->pdev->dev, ttinfo->sgl, ttinfo->nents,
1434 DMA_FROM_DEVICE);
1435 }
1436}
1437
1438static inline u32 cxgbi_build_sw_tag(u32 idx, u32 age)
1439{
1440 /* assume idx and age both are < 0x7FFF (32767) */
1441 return (idx << 16) | age;
9ba682f0 1442}
1443
1444static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1445{
71f7a00b
VP		 1446 struct scsi_cmnd *sc = task->sc;
1447 struct iscsi_conn *conn = task->conn;
1448 struct iscsi_session *sess = conn->session;
1449 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1450 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1451 struct cxgbi_device *cdev = cconn->chba->cdev;
1452 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1453 u32 sw_tag = cxgbi_build_sw_tag(task->itt, sess->age);
1454 u32 tag = 0;
1455 int err = -EINVAL;
1456
1457 if (sc &&
1458 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)
1459 ) {
1460 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1461 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1462
1463 scmd_get_params(sc, &ttinfo->sgl, &ttinfo->nents,
1464 &tdata->dlen, 0);
1465 err = cxgbi_ddp_reserve(cconn, tdata, sw_tag, tdata->dlen);
1466 if (!err)
1467 tag = ttinfo->tag;
1468 else
1469 log_debug(1 << CXGBI_DBG_DDP,
1470 "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1471 cconn->cep->csk, task, tdata->dlen,
1472 ttinfo->nents);
1473 }
1474
1475 if (err < 0) {
1476 err = cxgbi_ppm_make_non_ddp_tag(ppm, sw_tag, &tag);
1477 if (err < 0)
1478 return err;
1479 }
1480 /* the itt need to sent in big-endian order */
1481 *hdr_itt = (__force itt_t)htonl(tag);
1482
1483 log_debug(1 << CXGBI_DBG_DDP,
1484 "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1485 cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
9ba682f0 1486 return 0;
1487}
1488
1489void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1490{
71f7a00b
VP		 1491 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1492 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1493 struct cxgbi_device *cdev = cconn->chba->cdev;
1494 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1495 u32 tag = ntohl((__force u32)itt);
1496 u32 sw_bits;
1497
1498 if (ppm) {
1499 if (cxgbi_ppm_is_ddp_tag(ppm, tag))
1500 sw_bits = cxgbi_ppm_get_tag_caller_data(ppm, tag);
1501 else
1502 sw_bits = cxgbi_ppm_decode_non_ddp_tag(ppm, tag);
1503 } else {
1504 sw_bits = tag;
1505 }
1506
1507 cxgbi_decode_sw_tag(sw_bits, idx, age);
1508 log_debug(1 << CXGBI_DBG_DDP,
1509 "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1510 cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1511 age ? *age : 0xFF);
9ba682f0 1512}
1513EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1514
1515void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1516{
1517 struct iscsi_conn *conn = csk->user_data;
1518
1519 if (conn) {
1520 log_debug(1 << CXGBI_DBG_SOCK,
1521 "csk 0x%p, cid %d.\n", csk, conn->id);
1522 iscsi_conn_queue_work(conn);
1523 }
1524}
1525EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1526
1527/*
1528 * pdu receive, interact with libiscsi_tcp
1529 */
1530static inline int read_pdu_skb(struct iscsi_conn *conn,
1531 struct sk_buff *skb,
1532 unsigned int offset,
1533 int offloaded)
1534{
1535 int status = 0;
1536 int bytes_read;
1537
1538 bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1539 switch (status) {
1540 case ISCSI_TCP_CONN_ERR:
1541 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1542 skb, offset, offloaded);
1543 return -EIO;
1544 case ISCSI_TCP_SUSPENDED:
1545 log_debug(1 << CXGBI_DBG_PDU_RX,
1546 "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1547 skb, offset, offloaded, bytes_read);
1548 /* no transfer - just have caller flush queue */
1549 return bytes_read;
1550 case ISCSI_TCP_SKB_DONE:
1551 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1552 skb, offset, offloaded);
1553 /*
1554 * pdus should always fit in the skb and we should get
1555 * segment done notifcation.
1556 */
1557 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1558 return -EFAULT;
1559 case ISCSI_TCP_SEGMENT_DONE:
1560 log_debug(1 << CXGBI_DBG_PDU_RX,
1561 "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1562 skb, offset, offloaded, bytes_read);
1563 return bytes_read;
1564 default:
1565 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1566 skb, offset, offloaded, status);
1567 return -EINVAL;
1568 }
1569}
1570
1571static int skb_read_pdu_bhs(struct iscsi_conn *conn, struct sk_buff *skb)
1572{
1573 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1574
1575 log_debug(1 << CXGBI_DBG_PDU_RX,
1576 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1577 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1578
1579 if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1580 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1581 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1582 return -EIO;
1583 }
1584
1585 if (conn->hdrdgst_en &&
1586 cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1587 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1588 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1589 return -EIO;
1590 }
1591
44830d8f
VP		 1592 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_ISCSI_COMPL) &&
1593 cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA_DDPD)) {
1594 /* If completion flag is set and data is directly
1595 * placed in to the host memory then update
1596 * task->exp_datasn to the datasn in completion
1597 * iSCSI hdr as T6 adapter generates completion only
1598 * for the last pdu of a sequence.
1599 */
1600 itt_t itt = ((struct iscsi_data *)skb->data)->itt;
1601 struct iscsi_task *task = iscsi_itt_to_ctask(conn, itt);
1602 u32 data_sn = be32_to_cpu(((struct iscsi_data *)
1603 skb->data)->datasn);
1604 if (task && task->sc) {
1605 struct iscsi_tcp_task *tcp_task = task->dd_data;
1606
1607 tcp_task->exp_datasn = data_sn;
1608 }
1609 }
1610
9ba682f0 1611 return read_pdu_skb(conn, skb, 0, 0);
1612}
1613
1614static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1615 struct sk_buff *skb, unsigned int offset)
1616{
1617 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1618 bool offloaded = 0;
1619 int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1620
1621 log_debug(1 << CXGBI_DBG_PDU_RX,
1622 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1623 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1624
1625 if (conn->datadgst_en &&
1626 cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1627 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1628 conn, lskb, cxgbi_skcb_flags(lskb));
1629 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1630 return -EIO;
1631 }
1632
1633 if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1634 return 0;
1635
1636 /* coalesced, add header digest length */
1637 if (lskb == skb && conn->hdrdgst_en)
1638 offset += ISCSI_DIGEST_SIZE;
1639
1640 if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1641 offloaded = 1;
1642
1643 if (opcode == ISCSI_OP_SCSI_DATA_IN)
1644 log_debug(1 << CXGBI_DBG_PDU_RX,
1645 "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1646 skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1647 tcp_conn->in.datalen, offloaded ? "is" : "not");
1648
1649 return read_pdu_skb(conn, skb, offset, offloaded);
1650}
1651
1652static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1653{
1654 struct cxgbi_device *cdev = csk->cdev;
1655 int must_send;
1656 u32 credits;
1657
1658 log_debug(1 << CXGBI_DBG_PDU_RX,
fc385045 1659 "csk 0x%p,%u,0x%lx,%u, seq %u, wup %u, thre %u, %u.\n",
9ba682f0 1660 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1661 csk->rcv_wup, cdev->rx_credit_thres,
81daf10c 1662 csk->rcv_win);
9ba682f0 1663
586be7cb
VP		 1664 if (!cdev->rx_credit_thres)
1665 return;
1666
9ba682f0 1667 if (csk->state != CTP_ESTABLISHED)
1668 return;
1669
1670 credits = csk->copied_seq - csk->rcv_wup;
1671 if (unlikely(!credits))
1672 return;
81daf10c 1673 must_send = credits + 16384 >= csk->rcv_win;
9ba682f0 1674 if (must_send || credits >= cdev->rx_credit_thres)
1675 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1676}
1677
1678void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1679{
1680 struct cxgbi_device *cdev = csk->cdev;
1681 struct iscsi_conn *conn = csk->user_data;
1682 struct sk_buff *skb;
1683 unsigned int read = 0;
1684 int err = 0;
1685
1686 log_debug(1 << CXGBI_DBG_PDU_RX,
1687 "csk 0x%p, conn 0x%p.\n", csk, conn);
1688
1689 if (unlikely(!conn || conn->suspend_rx)) {
1690 log_debug(1 << CXGBI_DBG_PDU_RX,
1691 "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1692 csk, conn, conn ? conn->id : 0xFF,
1693 conn ? conn->suspend_rx : 0xFF);
9ba682f0 1694 return;
1695 }
1696
1697 while (!err) {
9ba682f0 1698 skb = skb_peek(&csk->receive_queue);
1699 if (!skb ||
1700 !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1701 if (skb)
1702 log_debug(1 << CXGBI_DBG_PDU_RX,
1703 "skb 0x%p, NOT ready 0x%lx.\n",
1704 skb, cxgbi_skcb_flags(skb));
9ba682f0 1705 break;
1706 }
1707 __skb_unlink(skb, &csk->receive_queue);
9ba682f0 1708
1709 read += cxgbi_skcb_rx_pdulen(skb);
1710 log_debug(1 << CXGBI_DBG_PDU_RX,
1711 "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1712 csk, skb, skb->len, cxgbi_skcb_flags(skb),
1713 cxgbi_skcb_rx_pdulen(skb));
1714
1715 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1716 err = skb_read_pdu_bhs(conn, skb);
e3d2ad8c 1717 if (err < 0) {
1718 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1719 "f 0x%lx, plen %u.\n",
1720 csk, skb, skb->len,
1721 cxgbi_skcb_flags(skb),
1722 cxgbi_skcb_rx_pdulen(skb));
1723 goto skb_done;
1724 }
9ba682f0 1725 err = skb_read_pdu_data(conn, skb, skb,
1726 err + cdev->skb_rx_extra);
e3d2ad8c 1727 if (err < 0)
1728 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1729 "f 0x%lx, plen %u.\n",
1730 csk, skb, skb->len,
1731 cxgbi_skcb_flags(skb),
1732 cxgbi_skcb_rx_pdulen(skb));
9ba682f0 1733 } else {
1734 err = skb_read_pdu_bhs(conn, skb);
e3d2ad8c 1735 if (err < 0) {
1736 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1737 "f 0x%lx, plen %u.\n",
1738 csk, skb, skb->len,
1739 cxgbi_skcb_flags(skb),
1740 cxgbi_skcb_rx_pdulen(skb));
1741 goto skb_done;
1742 }
1743
9ba682f0 1744 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1745 struct sk_buff *dskb;
1746
9ba682f0 1747 dskb = skb_peek(&csk->receive_queue);
1748 if (!dskb) {
e3d2ad8c 1749 pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1750 " plen %u, NO data.\n",
1751 csk, skb, skb->len,
1752 cxgbi_skcb_flags(skb),
1753 cxgbi_skcb_rx_pdulen(skb));
1754 err = -EIO;
1755 goto skb_done;
9ba682f0 1756 }
1757 __skb_unlink(dskb, &csk->receive_queue);
9ba682f0 1758
1759 err = skb_read_pdu_data(conn, skb, dskb, 0);
e3d2ad8c 1760 if (err < 0)
1761 pr_err("data, csk 0x%p, skb 0x%p,%u, "
1762 "f 0x%lx, plen %u, dskb 0x%p,"
1763 "%u.\n",
1764 csk, skb, skb->len,
1765 cxgbi_skcb_flags(skb),
1766 cxgbi_skcb_rx_pdulen(skb),
1767 dskb, dskb->len);
9ba682f0 1768 __kfree_skb(dskb);
1769 } else
1770 err = skb_read_pdu_data(conn, skb, skb, 0);
1771 }
e3d2ad8c 1772skb_done:
1773 __kfree_skb(skb);
1774
9ba682f0 1775 if (err < 0)
1776 break;
9ba682f0 1777 }
1778
1779 log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
1780 if (read) {
1781 csk->copied_seq += read;
1782 csk_return_rx_credits(csk, read);
1783 conn->rxdata_octets += read;
1784 }
1785
1786 if (err < 0) {
e3d2ad8c 1787 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
1788 csk, conn, err, read);
9ba682f0 1789 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1790 }
1791}
1792EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
1793
1794static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
1795 unsigned int offset, unsigned int *off,
1796 struct scatterlist **sgp)
1797{
1798 int i;
1799 struct scatterlist *sg;
1800
1801 for_each_sg(sgl, sg, sgcnt, i) {
1802 if (offset < sg->length) {
1803 *off = offset;
1804 *sgp = sg;
1805 return 0;
1806 }
1807 offset -= sg->length;
1808 }
1809 return -EFAULT;
1810}
1811
1812static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
6a39a16a 1813 unsigned int dlen, struct page_frag *frags,
9ba682f0 1814 int frag_max)
1815{
1816 unsigned int datalen = dlen;
1817 unsigned int sglen = sg->length - sgoffset;
1818 struct page *page = sg_page(sg);
1819 int i;
1820
1821 i = 0;
1822 do {
1823 unsigned int copy;
1824
1825 if (!sglen) {
1826 sg = sg_next(sg);
1827 if (!sg) {
1828 pr_warn("sg %d NULL, len %u/%u.\n",
1829 i, datalen, dlen);
1830 return -EINVAL;
1831 }
1832 sgoffset = 0;
1833 sglen = sg->length;
1834 page = sg_page(sg);
1835
1836 }
1837 copy = min(datalen, sglen);
1838 if (i && page == frags[i - 1].page &&
1839 sgoffset + sg->offset ==
6a39a16a
IC		 1840 frags[i - 1].offset + frags[i - 1].size) {
1841 frags[i - 1].size += copy;
9ba682f0 1842 } else {
1843 if (i >= frag_max) {
1844 pr_warn("too many pages %u, dlen %u.\n",
1845 frag_max, dlen);
1846 return -EINVAL;
1847 }
1848
1849 frags[i].page = page;
6a39a16a
IC		 1850 frags[i].offset = sg->offset + sgoffset;
1851 frags[i].size = copy;
9ba682f0 1852 i++;
1853 }
1854 datalen -= copy;
1855 sgoffset += copy;
1856 sglen -= copy;
1857 } while (datalen);
1858
1859 return i;
1860}
1861
1862int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
1863{
1864 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1865 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1866 struct cxgbi_device *cdev = cconn->chba->cdev;
1867 struct iscsi_conn *conn = task->conn;
1868 struct iscsi_tcp_task *tcp_task = task->dd_data;
e3d2ad8c 1869 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
9ba682f0 1870 struct scsi_cmnd *sc = task->sc;
1871 int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
1872
1873 tcp_task->dd_data = tdata;
1874 task->hdr = NULL;
1875
1876 if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
1877 (opcode == ISCSI_OP_SCSI_DATA_OUT ||
1878 (opcode == ISCSI_OP_SCSI_CMD &&
1879 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
1880 /* data could goes into skb head */
1881 headroom += min_t(unsigned int,
1882 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
1883 conn->max_xmit_dlength);
1884
1885 tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
1886 if (!tdata->skb) {
00c4a09b
TLSC		 1887 struct cxgbi_sock *csk = cconn->cep->csk;
1888 struct net_device *ndev = cdev->ports[csk->port_id];
1889 ndev->stats.tx_dropped++;
9ba682f0 1890 return -ENOMEM;
1891 }
1892
1893 skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
1894 task->hdr = (struct iscsi_hdr *)tdata->skb->data;
1895 task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
1896
1897 /* data_out uses scsi_cmd's itt */
1898 if (opcode != ISCSI_OP_SCSI_DATA_OUT)
1899 task_reserve_itt(task, &task->hdr->itt);
1900
1901 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1902 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
1903 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
1904 conn->max_xmit_dlength, ntohl(task->hdr->itt));
1905
1906 return 0;
1907}
1908EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
1909
1910static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
1911{
c343a01c 1912 if (hcrc || dcrc) {
1913 u8 submode = 0;
9ba682f0 1914
c343a01c 1915 if (hcrc)
1916 submode |= 1;
1917 if (dcrc)
1918 submode |= 2;
1919 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
1920 } else
1921 cxgbi_skcb_ulp_mode(skb) = 0;
9ba682f0 1922}
1923
1924int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
1925 unsigned int count)
1926{
1927 struct iscsi_conn *conn = task->conn;
e3d2ad8c 1928 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
9ba682f0 1929 struct sk_buff *skb = tdata->skb;
1930 unsigned int datalen = count;
1931 int i, padlen = iscsi_padding(count);
1932 struct page *pg;
1933
1934 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1935 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
1936 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
1937 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
1938
1939 skb_put(skb, task->hdr_len);
1940 tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
1941 if (!count)
1942 return 0;
1943
1944 if (task->sc) {
1945 struct scsi_data_buffer *sdb = scsi_out(task->sc);
1946 struct scatterlist *sg = NULL;
1947 int err;
1948
1949 tdata->offset = offset;
1950 tdata->count = count;
1951 err = sgl_seek_offset(
1952 sdb->table.sgl, sdb->table.nents,
1953 tdata->offset, &tdata->sgoffset, &sg);
1954 if (err < 0) {
1955 pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
1956 sdb->table.nents, tdata->offset, sdb->length);
1957 return err;
1958 }
1959 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
1960 tdata->frags, MAX_PDU_FRAGS);
1961 if (err < 0) {
1962 pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
1963 sdb->table.nents, tdata->offset, tdata->count);
1964 return err;
1965 }
1966 tdata->nr_frags = err;
1967
1968 if (tdata->nr_frags > MAX_SKB_FRAGS ||
1969 (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
1970 char *dst = skb->data + task->hdr_len;
6a39a16a 1971 struct page_frag *frag = tdata->frags;
9ba682f0 1972
1973 /* data fits in the skb's headroom */
1974 for (i = 0; i < tdata->nr_frags; i++, frag++) {
77dfce07 1975 char *src = kmap_atomic(frag->page);
9ba682f0 1976
6a39a16a
IC		 1977 memcpy(dst, src+frag->offset, frag->size);
1978 dst += frag->size;
77dfce07 1979 kunmap_atomic(src);
9ba682f0 1980 }
1981 if (padlen) {
1982 memset(dst, 0, padlen);
1983 padlen = 0;
1984 }
1985 skb_put(skb, count + padlen);
1986 } else {
1987 /* data fit into frag_list */
6a39a16a
IC		 1988 for (i = 0; i < tdata->nr_frags; i++) {
1989 __skb_fill_page_desc(skb, i,
1990 tdata->frags[i].page,
1991 tdata->frags[i].offset,
1992 tdata->frags[i].size);
1993 skb_frag_ref(skb, i);
1994 }
9ba682f0 1995 skb_shinfo(skb)->nr_frags = tdata->nr_frags;
1996 skb->len += count;
1997 skb->data_len += count;
1998 skb->truesize += count;
1999 }
2000
2001 } else {
2002 pg = virt_to_page(task->data);
2003
2004 get_page(pg);
2005 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
2006 count);
2007 skb->len += count;
2008 skb->data_len += count;
2009 skb->truesize += count;
2010 }
2011
2012 if (padlen) {
2013 i = skb_shinfo(skb)->nr_frags;
2014 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
2015 virt_to_page(padding), offset_in_page(padding),
2016 padlen);
2017
2018 skb->data_len += padlen;
2019 skb->truesize += padlen;
2020 skb->len += padlen;
2021 }
2022
2023 return 0;
2024}
2025EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
2026
2027int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2028{
2029 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2030 struct cxgbi_conn *cconn = tcp_conn->dd_data;
e3d2ad8c 2031 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
71f7a00b 2032 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
9ba682f0 2033 struct sk_buff *skb = tdata->skb;
71f7a00b 2034 struct cxgbi_sock *csk = NULL;
9ba682f0 2035 unsigned int datalen;
2036 int err;
2037
2038 if (!skb) {
2039 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2040 "task 0x%p, skb NULL.\n", task);
2041 return 0;
2042 }
2043
71f7a00b
VP		 2044 if (cconn && cconn->cep)
2045 csk = cconn->cep->csk;
2046 if (!csk) {
2047 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2048 "task 0x%p, csk gone.\n", task);
2049 return -EPIPE;
2050 }
2051
9ba682f0 2052 datalen = skb->data_len;
2053 tdata->skb = NULL;
71f7a00b
VP		 2054
2055 /* write ppod first if using ofldq to write ppod */
2056 if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_VALID) {
2057 struct cxgbi_ppm *ppm = csk->cdev->cdev2ppm(csk->cdev);
2058
2059 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_VALID;
2060 if (csk->cdev->csk_ddp_set_map(ppm, csk, ttinfo) < 0)
2061 pr_err("task 0x%p, ppod writing using ofldq failed.\n",
2062 task);
2063 /* continue. Let fl get the data */
2064 }
2065
9ba682f0 2066 err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2067 if (err > 0) {
2068 int pdulen = err;
2069
2070 log_debug(1 << CXGBI_DBG_PDU_TX,
2071 "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2072 task, task->sc, skb, skb->len, skb->data_len, err);
2073
2074 if (task->conn->hdrdgst_en)
2075 pdulen += ISCSI_DIGEST_SIZE;
2076
2077 if (datalen && task->conn->datadgst_en)
2078 pdulen += ISCSI_DIGEST_SIZE;
2079
2080 task->conn->txdata_octets += pdulen;
2081 return 0;
2082 }
2083
2084 if (err == -EAGAIN || err == -ENOBUFS) {
2085 log_debug(1 << CXGBI_DBG_PDU_TX,
2086 "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2087 task, skb, skb->len, skb->data_len, err);
2088 /* reset skb to send when we are called again */
2089 tdata->skb = skb;
2090 return err;
2091 }
2092
9ba682f0 2093 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2094 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2095 task->itt, skb, skb->len, skb->data_len, err);
ed481a33
KX		 2096
2097 kfree_skb(skb);
2098
9ba682f0 2099 iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2100 iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2101 return err;
2102}
2103EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2104
2105void cxgbi_cleanup_task(struct iscsi_task *task)
2106{
71f7a00b 2107 struct iscsi_tcp_task *tcp_task = task->dd_data;
e3d2ad8c 2108 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
9ba682f0 2109
2110 log_debug(1 << CXGBI_DBG_ISCSI,
2111 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2112 task, tdata->skb, task->hdr_itt);
2113
71f7a00b 2114 tcp_task->dd_data = NULL;
9ba682f0 2115 /* never reached the xmit task callout */
2116 if (tdata->skb)
2117 __kfree_skb(tdata->skb);
9ba682f0 2118
2119 task_release_itt(task, task->hdr_itt);
69e2d1e6
VP		 2120 memset(tdata, 0, sizeof(*tdata));
2121
9ba682f0 2122 iscsi_tcp_cleanup_task(task);
2123}
2124EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2125
2126void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2127 struct iscsi_stats *stats)
2128{
2129 struct iscsi_conn *conn = cls_conn->dd_data;
2130
2131 stats->txdata_octets = conn->txdata_octets;
2132 stats->rxdata_octets = conn->rxdata_octets;
2133 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2134 stats->dataout_pdus = conn->dataout_pdus_cnt;
2135 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2136 stats->datain_pdus = conn->datain_pdus_cnt;
2137 stats->r2t_pdus = conn->r2t_pdus_cnt;
2138 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2139 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2140 stats->digest_err = 0;
2141 stats->timeout_err = 0;
2142 stats->custom_length = 1;
2143 strcpy(stats->custom[0].desc, "eh_abort_cnt");
2144 stats->custom[0].value = conn->eh_abort_cnt;
2145}
2146EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2147
2148static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2149{
2150 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2151 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2152 struct cxgbi_device *cdev = cconn->chba->cdev;
2153 unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2154 unsigned int max_def = 512 * MAX_SKB_FRAGS;
2155 unsigned int max = max(max_def, headroom);
2156
2157 max = min(cconn->chba->cdev->tx_max_size, max);
2158 if (conn->max_xmit_dlength)
2159 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2160 else
2161 conn->max_xmit_dlength = max;
2162 cxgbi_align_pdu_size(conn->max_xmit_dlength);
2163
2164 return 0;
2165}
2166
2167static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2168{
2169 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2170 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2171 unsigned int max = cconn->chba->cdev->rx_max_size;
2172
2173 cxgbi_align_pdu_size(max);
2174
2175 if (conn->max_recv_dlength) {
2176 if (conn->max_recv_dlength > max) {
2177 pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2178 conn->max_recv_dlength, max);
2179 return -EINVAL;
2180 }
2181 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2182 cxgbi_align_pdu_size(conn->max_recv_dlength);
2183 } else
2184 conn->max_recv_dlength = max;
2185
2186 return 0;
2187}
2188
2189int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2190 enum iscsi_param param, char *buf, int buflen)
2191{
2192 struct iscsi_conn *conn = cls_conn->dd_data;
9ba682f0 2193 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2194 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2195 struct cxgbi_sock *csk = cconn->cep->csk;
1304be5f 2196 int err;
9ba682f0 2197
2198 log_debug(1 << CXGBI_DBG_ISCSI,
2199 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2200 cls_conn, param, buflen, buf);
2201
2202 switch (param) {
2203 case ISCSI_PARAM_HDRDGST_EN:
2204 err = iscsi_set_param(cls_conn, param, buf, buflen);
2205 if (!err && conn->hdrdgst_en)
2206 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2207 conn->hdrdgst_en,
2208 conn->datadgst_en, 0);
2209 break;
2210 case ISCSI_PARAM_DATADGST_EN:
2211 err = iscsi_set_param(cls_conn, param, buf, buflen);
2212 if (!err && conn->datadgst_en)
2213 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2214 conn->hdrdgst_en,
2215 conn->datadgst_en, 0);
2216 break;
2217 case ISCSI_PARAM_MAX_R2T:
1304be5f 2218 return iscsi_tcp_set_max_r2t(conn, buf);
9ba682f0 2219 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2220 err = iscsi_set_param(cls_conn, param, buf, buflen);
2221 if (!err)
2222 err = cxgbi_conn_max_recv_dlength(conn);
2223 break;
2224 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2225 err = iscsi_set_param(cls_conn, param, buf, buflen);
2226 if (!err)
2227 err = cxgbi_conn_max_xmit_dlength(conn);
2228 break;
2229 default:
2230 return iscsi_set_param(cls_conn, param, buf, buflen);
2231 }
2232 return err;
2233}
2234EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2235
fc8d0590
AB		 2236static inline int csk_print_port(struct cxgbi_sock *csk, char *buf)
2237{
2238 int len;
2239
2240 cxgbi_sock_get(csk);
2241 len = sprintf(buf, "%hu\n", ntohs(csk->daddr.sin_port));
2242 cxgbi_sock_put(csk);
2243
2244 return len;
2245}
2246
2247static inline int csk_print_ip(struct cxgbi_sock *csk, char *buf)
2248{
2249 int len;
2250
2251 cxgbi_sock_get(csk);
2252 if (csk->csk_family == AF_INET)
2253 len = sprintf(buf, "%pI4",
2254 &csk->daddr.sin_addr.s_addr);
2255 else
2256 len = sprintf(buf, "%pI6",
2257 &csk->daddr6.sin6_addr);
2258
2259 cxgbi_sock_put(csk);
2260
2261 return len;
2262}
2263
c71b9b66
MC		 2264int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2265 char *buf)
9ba682f0 2266{
c71b9b66
MC		 2267 struct cxgbi_endpoint *cep = ep->dd_data;
2268 struct cxgbi_sock *csk;
9ba682f0 2269 int len;
2270
2271 log_debug(1 << CXGBI_DBG_ISCSI,
c71b9b66 2272 "cls_conn 0x%p, param %d.\n", ep, param);
9ba682f0 2273
2274 switch (param) {
2275 case ISCSI_PARAM_CONN_PORT:
9ba682f0 2276 case ISCSI_PARAM_CONN_ADDRESS:
c71b9b66
MC		 2277 if (!cep)
2278 return -ENOTCONN;
2279
2280 csk = cep->csk;
2281 if (!csk)
2282 return -ENOTCONN;
2283
2284 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2285 &csk->daddr, param, buf);
9ba682f0 2286 default:
c71b9b66 2287 return -ENOSYS;
9ba682f0 2288 }
2289 return len;
2290}
c71b9b66 2291EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
9ba682f0 2292
2293struct iscsi_cls_conn *
2294cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2295{
2296 struct iscsi_cls_conn *cls_conn;
2297 struct iscsi_conn *conn;
2298 struct iscsi_tcp_conn *tcp_conn;
2299 struct cxgbi_conn *cconn;
2300
2301 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2302 if (!cls_conn)
2303 return NULL;
2304
2305 conn = cls_conn->dd_data;
2306 tcp_conn = conn->dd_data;
2307 cconn = tcp_conn->dd_data;
2308 cconn->iconn = conn;
2309
2310 log_debug(1 << CXGBI_DBG_ISCSI,
2311 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2312 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2313
2314 return cls_conn;
2315}
2316EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2317
2318int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2319 struct iscsi_cls_conn *cls_conn,
2320 u64 transport_eph, int is_leading)
2321{
2322 struct iscsi_conn *conn = cls_conn->dd_data;
2323 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2324 struct cxgbi_conn *cconn = tcp_conn->dd_data;
71f7a00b 2325 struct cxgbi_ppm *ppm;
9ba682f0 2326 struct iscsi_endpoint *ep;
2327 struct cxgbi_endpoint *cep;
2328 struct cxgbi_sock *csk;
2329 int err;
2330
2331 ep = iscsi_lookup_endpoint(transport_eph);
2332 if (!ep)
2333 return -EINVAL;
2334
2335 /* setup ddp pagesize */
2336 cep = ep->dd_data;
2337 csk = cep->csk;
9ba682f0 2338
71f7a00b
VP		 2339 ppm = csk->cdev->cdev2ppm(csk->cdev);
2340 err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid,
2341 ppm->tformat.pgsz_idx_dflt, 0);
2342 if (err < 0)
2343 return err;
2344
9ba682f0 2345 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2346 if (err)
2347 return -EINVAL;
2348
2349 /* calculate the tag idx bits needed for this conn based on cmds_max */
2350 cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2351
e3d2ad8c 2352 write_lock_bh(&csk->callback_lock);
9ba682f0 2353 csk->user_data = conn;
2354 cconn->chba = cep->chba;
2355 cconn->cep = cep;
2356 cep->cconn = cconn;
e3d2ad8c 2357 write_unlock_bh(&csk->callback_lock);
9ba682f0 2358
2359 cxgbi_conn_max_xmit_dlength(conn);
2360 cxgbi_conn_max_recv_dlength(conn);
2361
9ba682f0 2362 log_debug(1 << CXGBI_DBG_ISCSI,
2363 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2364 cls_session, cls_conn, ep, cconn, csk);
2365 /* init recv engine */
2366 iscsi_tcp_hdr_recv_prep(tcp_conn);
2367
2368 return 0;
2369}
2370EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2371
2372struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2373 u16 cmds_max, u16 qdepth,
2374 u32 initial_cmdsn)
2375{
2376 struct cxgbi_endpoint *cep;
2377 struct cxgbi_hba *chba;
2378 struct Scsi_Host *shost;
2379 struct iscsi_cls_session *cls_session;
2380 struct iscsi_session *session;
2381
2382 if (!ep) {
2383 pr_err("missing endpoint.\n");
2384 return NULL;
2385 }
2386
2387 cep = ep->dd_data;
2388 chba = cep->chba;
2389 shost = chba->shost;
2390
2391 BUG_ON(chba != iscsi_host_priv(shost));
2392
2393 cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2394 cmds_max, 0,
2395 sizeof(struct iscsi_tcp_task) +
2396 sizeof(struct cxgbi_task_data),
2397 initial_cmdsn, ISCSI_MAX_TARGET);
2398 if (!cls_session)
2399 return NULL;
2400
2401 session = cls_session->dd_data;
2402 if (iscsi_tcp_r2tpool_alloc(session))
2403 goto remove_session;
2404
2405 log_debug(1 << CXGBI_DBG_ISCSI,
2406 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2407 return cls_session;
2408
2409remove_session:
2410 iscsi_session_teardown(cls_session);
2411 return NULL;
2412}
2413EXPORT_SYMBOL_GPL(cxgbi_create_session);
2414
2415void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2416{
2417 log_debug(1 << CXGBI_DBG_ISCSI,
2418 "cls sess 0x%p.\n", cls_session);
2419
2420 iscsi_tcp_r2tpool_free(cls_session->dd_data);
2421 iscsi_session_teardown(cls_session);
2422}
2423EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2424
2425int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2426 char *buf, int buflen)
2427{
2428 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2429
2430 if (!chba->ndev) {
2431 shost_printk(KERN_ERR, shost, "Could not get host param. "
2432 "netdev for host not set.\n");
2433 return -ENODEV;
2434 }
2435
2436 log_debug(1 << CXGBI_DBG_ISCSI,
2437 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2438 shost, chba, chba->ndev->name, param, buflen, buf);
2439
2440 switch (param) {
2441 case ISCSI_HOST_PARAM_IPADDRESS:
2442 {
2443 __be32 addr = in_aton(buf);
2444 log_debug(1 << CXGBI_DBG_ISCSI,
2445 "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2446 cxgbi_set_iscsi_ipv4(chba, addr);
2447 return 0;
2448 }
2449 case ISCSI_HOST_PARAM_HWADDRESS:
2450 case ISCSI_HOST_PARAM_NETDEV_NAME:
2451 return 0;
2452 default:
2453 return iscsi_host_set_param(shost, param, buf, buflen);
2454 }
2455}
2456EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2457
2458int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2459 char *buf)
2460{
2461 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2462 int len = 0;
2463
2464 if (!chba->ndev) {
2465 shost_printk(KERN_ERR, shost, "Could not get host param. "
2466 "netdev for host not set.\n");
2467 return -ENODEV;
2468 }
2469
2470 log_debug(1 << CXGBI_DBG_ISCSI,
2471 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2472 shost, chba, chba->ndev->name, param);
2473
2474 switch (param) {
2475 case ISCSI_HOST_PARAM_HWADDRESS:
2476 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2477 break;
2478 case ISCSI_HOST_PARAM_NETDEV_NAME:
2479 len = sprintf(buf, "%s\n", chba->ndev->name);
2480 break;
2481 case ISCSI_HOST_PARAM_IPADDRESS:
2482 {
dd9ad67e
AB		 2483 struct cxgbi_sock *csk = find_sock_on_port(chba->cdev,
2484 chba->port_id);
2485 if (csk) {
2486 len = sprintf(buf, "%pIS",
2487 (struct sockaddr *)&csk->saddr);
2488 }
9ba682f0 2489 log_debug(1 << CXGBI_DBG_ISCSI,
dd9ad67e 2490 "hba %s, addr %s.\n", chba->ndev->name, buf);
9ba682f0 2491 break;
2492 }
2493 default:
2494 return iscsi_host_get_param(shost, param, buf);
2495 }
2496
2497 return len;
2498}
2499EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2500
2501struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2502 struct sockaddr *dst_addr,
2503 int non_blocking)
2504{
2505 struct iscsi_endpoint *ep;
2506 struct cxgbi_endpoint *cep;
2507 struct cxgbi_hba *hba = NULL;
2508 struct cxgbi_sock *csk;
2509 int err = -EINVAL;
2510
2511 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2512 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2513 shost, non_blocking, dst_addr);
2514
2515 if (shost) {
2516 hba = iscsi_host_priv(shost);
2517 if (!hba) {
2518 pr_info("shost 0x%p, priv NULL.\n", shost);
2519 goto err_out;
2520 }
2521 }
2522
fc8d0590
AB		 2523 if (dst_addr->sa_family == AF_INET) {
2524 csk = cxgbi_check_route(dst_addr);
e81fbf6c 2525#if IS_ENABLED(CONFIG_IPV6)
fc8d0590
AB		 2526 } else if (dst_addr->sa_family == AF_INET6) {
2527 csk = cxgbi_check_route6(dst_addr);
e81fbf6c 2528#endif
fc8d0590
AB		 2529 } else {
2530 pr_info("address family 0x%x NOT supported.\n",
2531 dst_addr->sa_family);
2532 err = -EAFNOSUPPORT;
2533 return (struct iscsi_endpoint *)ERR_PTR(err);
2534 }
2535
9ba682f0 2536 if (IS_ERR(csk))
2537 return (struct iscsi_endpoint *)csk;
2538 cxgbi_sock_get(csk);
2539
2540 if (!hba)
2541 hba = csk->cdev->hbas[csk->port_id];
2542 else if (hba != csk->cdev->hbas[csk->port_id]) {
2543 pr_info("Could not connect through requested host %u"
2544 "hba 0x%p != 0x%p (%u).\n",
2545 shost->host_no, hba,
2546 csk->cdev->hbas[csk->port_id], csk->port_id);
2547 err = -ENOSPC;
2548 goto release_conn;
2549 }
2550
2551 err = sock_get_port(csk);
2552 if (err)
2553 goto release_conn;
2554
2555 cxgbi_sock_set_state(csk, CTP_CONNECTING);
2556 err = csk->cdev->csk_init_act_open(csk);
2557 if (err)
2558 goto release_conn;
2559
2560 if (cxgbi_sock_is_closing(csk)) {
2561 err = -ENOSPC;
2562 pr_info("csk 0x%p is closing.\n", csk);
2563 goto release_conn;
2564 }
2565
2566 ep = iscsi_create_endpoint(sizeof(*cep));
2567 if (!ep) {
2568 err = -ENOMEM;
2569 pr_info("iscsi alloc ep, OOM.\n");
2570 goto release_conn;
2571 }
2572
2573 cep = ep->dd_data;
2574 cep->csk = csk;
2575 cep->chba = hba;
2576
2577 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2578 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2579 ep, cep, csk, hba, hba->ndev->name);
2580 return ep;
2581
2582release_conn:
2583 cxgbi_sock_put(csk);
2584 cxgbi_sock_closed(csk);
2585err_out:
2586 return ERR_PTR(err);
2587}
2588EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2589
2590int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2591{
2592 struct cxgbi_endpoint *cep = ep->dd_data;
2593 struct cxgbi_sock *csk = cep->csk;
2594
2595 if (!cxgbi_sock_is_established(csk))
2596 return 0;
2597 return 1;
2598}
2599EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2600
2601void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2602{
2603 struct cxgbi_endpoint *cep = ep->dd_data;
2604 struct cxgbi_conn *cconn = cep->cconn;
2605 struct cxgbi_sock *csk = cep->csk;
2606
2607 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2608 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2609 ep, cep, cconn, csk, csk->state, csk->flags);
2610
2611 if (cconn && cconn->iconn) {
2612 iscsi_suspend_tx(cconn->iconn);
2613 write_lock_bh(&csk->callback_lock);
2614 cep->csk->user_data = NULL;
2615 cconn->cep = NULL;
2616 write_unlock_bh(&csk->callback_lock);
2617 }
2618 iscsi_destroy_endpoint(ep);
2619
2620 if (likely(csk->state >= CTP_ESTABLISHED))
2621 need_active_close(csk);
2622 else
2623 cxgbi_sock_closed(csk);
2624
2625 cxgbi_sock_put(csk);
2626}
2627EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2628
2629int cxgbi_iscsi_init(struct iscsi_transport *itp,
2630 struct scsi_transport_template **stt)
2631{
2632 *stt = iscsi_register_transport(itp);
2633 if (*stt == NULL) {
2634 pr_err("unable to register %s transport 0x%p.\n",
2635 itp->name, itp);
2636 return -ENODEV;
2637 }
2638 log_debug(1 << CXGBI_DBG_ISCSI,
2639 "%s, registered iscsi transport 0x%p.\n",
2640 itp->name, stt);
2641 return 0;
2642}
2643EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2644
2645void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2646 struct scsi_transport_template **stt)
2647{
2648 if (*stt) {
2649 log_debug(1 << CXGBI_DBG_ISCSI,
2650 "de-register transport 0x%p, %s, stt 0x%p.\n",
2651 itp, itp->name, *stt);
2652 *stt = NULL;
2653 iscsi_unregister_transport(itp);
2654 }
2655}
2656EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2657
587a1f16 2658umode_t cxgbi_attr_is_visible(int param_type, int param)
3128c6c7
MC		 2659{
2660 switch (param_type) {
f27fb2ef
MC		 2661 case ISCSI_HOST_PARAM:
2662 switch (param) {
2663 case ISCSI_HOST_PARAM_NETDEV_NAME:
2664 case ISCSI_HOST_PARAM_HWADDRESS:
2665 case ISCSI_HOST_PARAM_IPADDRESS:
2666 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2667 return S_IRUGO;
2668 default:
2669 return 0;
2670 }
3128c6c7
MC		 2671 case ISCSI_PARAM:
2672 switch (param) {
2673 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2674 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2675 case ISCSI_PARAM_HDRDGST_EN:
2676 case ISCSI_PARAM_DATADGST_EN:
2677 case ISCSI_PARAM_CONN_ADDRESS:
2678 case ISCSI_PARAM_CONN_PORT:
2679 case ISCSI_PARAM_EXP_STATSN:
2680 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2681 case ISCSI_PARAM_PERSISTENT_PORT:
2682 case ISCSI_PARAM_PING_TMO:
2683 case ISCSI_PARAM_RECV_TMO:
1d063c17
MC		 2684 case ISCSI_PARAM_INITIAL_R2T_EN:
2685 case ISCSI_PARAM_MAX_R2T:
2686 case ISCSI_PARAM_IMM_DATA_EN:
2687 case ISCSI_PARAM_FIRST_BURST:
2688 case ISCSI_PARAM_MAX_BURST:
2689 case ISCSI_PARAM_PDU_INORDER_EN:
2690 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2691 case ISCSI_PARAM_ERL:
2692 case ISCSI_PARAM_TARGET_NAME:
2693 case ISCSI_PARAM_TPGT:
2694 case ISCSI_PARAM_USERNAME:
2695 case ISCSI_PARAM_PASSWORD:
2696 case ISCSI_PARAM_USERNAME_IN:
2697 case ISCSI_PARAM_PASSWORD_IN:
2698 case ISCSI_PARAM_FAST_ABORT:
2699 case ISCSI_PARAM_ABORT_TMO:
2700 case ISCSI_PARAM_LU_RESET_TMO:
2701 case ISCSI_PARAM_TGT_RESET_TMO:
2702 case ISCSI_PARAM_IFACE_NAME:
2703 case ISCSI_PARAM_INITIATOR_NAME:
3128c6c7
MC		 2704 return S_IRUGO;
2705 default:
2706 return 0;
2707 }
2708 }
2709
2710 return 0;
2711}
2712EXPORT_SYMBOL_GPL(cxgbi_attr_is_visible);
2713
9ba682f0 2714static int __init libcxgbi_init_module(void)
2715{
0ea5bf3d 2716 pr_info("%s", version);
9ba682f0 2717 return 0;
2718}
2719
2720static void __exit libcxgbi_exit_module(void)
2721{
2722 cxgbi_device_unregister_all(0xFF);
2723 return;
2724}
2725
2726module_init(libcxgbi_init_module);
2727module_exit(libcxgbi_exit_module);
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