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Merge tag 'linux-watchdog-5.1-rc1' of git://www.linux-watchdog.org/linux-watchdog
[linux-2.6-block.git] / drivers / scsi / cxgbi / libcxgbi.c
CommitLineData
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
d0d7b10b 226 if (is_vlan_dev(ndev)) {
0b3d8947 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
d0d7b10b 259 if (is_vlan_dev(ndev)) {
576b5863
AB		 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
d0d7b10b 293 if (is_vlan_dev(ndev)) {
fc8d0590
AB		 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);
cd07f958 575 timer_setup(&csk->retry_timer, NULL, 0);
9e8f1c79 576 init_completion(&csk->cmpl);
9ba682f0 577 rwlock_init(&csk->callback_lock);
578 csk->cdev = cdev;
579 csk->flags = 0;
580 cxgbi_sock_set_state(csk, CTP_CLOSED);
581
582 log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk);
583
584 return csk;
585}
586
f4bfd99f
DM		 587static struct rtable *find_route_ipv4(struct flowi4 *fl4,
588 __be32 saddr, __be32 daddr,
4737c5a0
VP		 589 __be16 sport, __be16 dport, u8 tos,
590 int ifindex)
9ba682f0 591{
592 struct rtable *rt;
9ba682f0 593
f4bfd99f 594 rt = ip_route_output_ports(&init_net, fl4, NULL, daddr, saddr,
4737c5a0 595 dport, sport, IPPROTO_TCP, tos, ifindex);
b23dd4fe 596 if (IS_ERR(rt))
9ba682f0 597 return NULL;
598
599 return rt;
600}
601
4737c5a0
VP		 602static struct cxgbi_sock *
603cxgbi_check_route(struct sockaddr *dst_addr, int ifindex)
9ba682f0 604{
605 struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
606 struct dst_entry *dst;
607 struct net_device *ndev;
608 struct cxgbi_device *cdev;
609 struct rtable *rt = NULL;
a58b61e5 610 struct neighbour *n;
f4bfd99f 611 struct flowi4 fl4;
9ba682f0 612 struct cxgbi_sock *csk = NULL;
613 unsigned int mtu = 0;
614 int port = 0xFFFF;
615 int err = 0;
616
4737c5a0
VP		 617 rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0,
618 daddr->sin_port, 0, ifindex);
9ba682f0 619 if (!rt) {
620 pr_info("no route to ipv4 0x%x, port %u.\n",
fc8d0590
AB		 621 be32_to_cpu(daddr->sin_addr.s_addr),
622 be16_to_cpu(daddr->sin_port));
9ba682f0 623 err = -ENETUNREACH;
624 goto err_out;
625 }
626 dst = &rt->dst;
0b399d46 627 n = dst_neigh_lookup(dst, &daddr->sin_addr.s_addr);
a58b61e5
DM		 628 if (!n) {
629 err = -ENODEV;
630 goto rel_rt;
631 }
632 ndev = n->dev;
9ba682f0 633
634 if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
635 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
636 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
637 ndev->name);
638 err = -ENETUNREACH;
0b399d46 639 goto rel_neigh;
9ba682f0 640 }
641
642 if (ndev->flags & IFF_LOOPBACK) {
643 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
644 mtu = ndev->mtu;
645 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
a58b61e5 646 n->dev->name, ndev->name, mtu);
9ba682f0 647 }
648
165ae50e
VP		 649 if (!(ndev->flags & IFF_UP) || !netif_carrier_ok(ndev)) {
650 pr_info("%s interface not up.\n", ndev->name);
651 err = -ENETDOWN;
652 goto rel_neigh;
653 }
654
9ba682f0 655 cdev = cxgbi_device_find_by_netdev(ndev, &port);
656 if (!cdev) {
657 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
658 &daddr->sin_addr.s_addr, ndev->name);
659 err = -ENETUNREACH;
0b399d46 660 goto rel_neigh;
9ba682f0 661 }
662 log_debug(1 << CXGBI_DBG_SOCK,
663 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
664 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
665 port, ndev->name, cdev);
666
667 csk = cxgbi_sock_create(cdev);
668 if (!csk) {
669 err = -ENOMEM;
0b399d46 670 goto rel_neigh;
9ba682f0 671 }
672 csk->cdev = cdev;
673 csk->port_id = port;
674 csk->mtu = mtu;
675 csk->dst = dst;
fc8d0590
AB		 676
677 csk->csk_family = AF_INET;
9ba682f0 678 csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
679 csk->daddr.sin_port = daddr->sin_port;
c71b9b66 680 csk->daddr.sin_family = daddr->sin_family;
fc8d0590 681 csk->saddr.sin_family = daddr->sin_family;
f4bfd99f 682 csk->saddr.sin_addr.s_addr = fl4.saddr;
0b399d46 683 neigh_release(n);
9ba682f0 684
685 return csk;
686
0b399d46
DM		 687rel_neigh:
688 neigh_release(n);
689
9ba682f0 690rel_rt:
691 ip_rt_put(rt);
9ba682f0 692err_out:
693 return ERR_PTR(err);
694}
695
e81fbf6c 696#if IS_ENABLED(CONFIG_IPV6)
fc8d0590 697static struct rt6_info *find_route_ipv6(const struct in6_addr *saddr,
4737c5a0
VP		 698 const struct in6_addr *daddr,
699 int ifindex)
fc8d0590
AB		 700{
701 struct flowi6 fl;
702
3d6d30d6 703 memset(&fl, 0, sizeof(fl));
4737c5a0 704 fl.flowi6_oif = ifindex;
fc8d0590
AB		 705 if (saddr)
706 memcpy(&fl.saddr, saddr, sizeof(struct in6_addr));
707 if (daddr)
708 memcpy(&fl.daddr, daddr, sizeof(struct in6_addr));
709 return (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl);
710}
711
4737c5a0
VP		 712static struct cxgbi_sock *
713cxgbi_check_route6(struct sockaddr *dst_addr, int ifindex)
fc8d0590
AB		 714{
715 struct sockaddr_in6 *daddr6 = (struct sockaddr_in6 *)dst_addr;
716 struct dst_entry *dst;
717 struct net_device *ndev;
718 struct cxgbi_device *cdev;
719 struct rt6_info *rt = NULL;
720 struct neighbour *n;
721 struct in6_addr pref_saddr;
722 struct cxgbi_sock *csk = NULL;
723 unsigned int mtu = 0;
724 int port = 0xFFFF;
725 int err = 0;
726
4737c5a0 727 rt = find_route_ipv6(NULL, &daddr6->sin6_addr, ifindex);
fc8d0590
AB		 728
729 if (!rt) {
730 pr_info("no route to ipv6 %pI6 port %u\n",
731 daddr6->sin6_addr.s6_addr,
732 be16_to_cpu(daddr6->sin6_port));
733 err = -ENETUNREACH;
734 goto err_out;
735 }
736
737 dst = &rt->dst;
738
739 n = dst_neigh_lookup(dst, &daddr6->sin6_addr);
740
741 if (!n) {
742 pr_info("%pI6, port %u, dst no neighbour.\n",
743 daddr6->sin6_addr.s6_addr,
744 be16_to_cpu(daddr6->sin6_port));
745 err = -ENETUNREACH;
746 goto rel_rt;
747 }
748 ndev = n->dev;
749
165ae50e
VP		 750 if (!(ndev->flags & IFF_UP) || !netif_carrier_ok(ndev)) {
751 pr_info("%s interface not up.\n", ndev->name);
752 err = -ENETDOWN;
753 goto rel_rt;
754 }
755
fd0273d7 756 if (ipv6_addr_is_multicast(&daddr6->sin6_addr)) {
fc8d0590
AB		 757 pr_info("multi-cast route %pI6 port %u, dev %s.\n",
758 daddr6->sin6_addr.s6_addr,
759 ntohs(daddr6->sin6_port), ndev->name);
760 err = -ENETUNREACH;
761 goto rel_rt;
762 }
763
764 cdev = cxgbi_device_find_by_netdev(ndev, &port);
765 if (!cdev)
766 cdev = cxgbi_device_find_by_mac(ndev, &port);
767 if (!cdev) {
768 pr_info("dst %pI6 %s, NOT cxgbi device.\n",
769 daddr6->sin6_addr.s6_addr, ndev->name);
770 err = -ENETUNREACH;
771 goto rel_rt;
772 }
773 log_debug(1 << CXGBI_DBG_SOCK,
774 "route to %pI6 :%u, ndev p#%d,%s, cdev 0x%p.\n",
775 daddr6->sin6_addr.s6_addr, ntohs(daddr6->sin6_port), port,
776 ndev->name, cdev);
777
778 csk = cxgbi_sock_create(cdev);
779 if (!csk) {
780 err = -ENOMEM;
781 goto rel_rt;
782 }
783 csk->cdev = cdev;
784 csk->port_id = port;
785 csk->mtu = mtu;
786 csk->dst = dst;
787
67edf21e
DA		 788 rt6_get_prefsrc(rt, &pref_saddr);
789 if (ipv6_addr_any(&pref_saddr)) {
fc8d0590
AB		 790 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry *)rt);
791
792 err = ipv6_dev_get_saddr(&init_net, idev ? idev->dev : NULL,
793 &daddr6->sin6_addr, 0, &pref_saddr);
794 if (err) {
795 pr_info("failed to get source address to reach %pI6\n",
796 &daddr6->sin6_addr);
797 goto rel_rt;
798 }
fc8d0590
AB		 799 }
800
801 csk->csk_family = AF_INET6;
802 csk->daddr6.sin6_addr = daddr6->sin6_addr;
803 csk->daddr6.sin6_port = daddr6->sin6_port;
804 csk->daddr6.sin6_family = daddr6->sin6_family;
dd9ad67e 805 csk->saddr6.sin6_family = daddr6->sin6_family;
fc8d0590
AB		 806 csk->saddr6.sin6_addr = pref_saddr;
807
808 neigh_release(n);
809 return csk;
810
811rel_rt:
812 if (n)
813 neigh_release(n);
814
815 ip6_rt_put(rt);
816 if (csk)
817 cxgbi_sock_closed(csk);
818err_out:
819 return ERR_PTR(err);
820}
e81fbf6c 821#endif /* IS_ENABLED(CONFIG_IPV6) */
fc8d0590 822
9ba682f0 823void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
824 unsigned int opt)
825{
826 csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
827 dst_confirm(csk->dst);
828 smp_mb();
829 cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
830}
831EXPORT_SYMBOL_GPL(cxgbi_sock_established);
832
833static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
834{
835 log_debug(1 << CXGBI_DBG_SOCK,
836 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
837 csk, csk->state, csk->flags, csk->user_data);
838
839 if (csk->state != CTP_ESTABLISHED) {
e3d2ad8c 840 read_lock_bh(&csk->callback_lock);
9ba682f0 841 if (csk->user_data)
842 iscsi_conn_failure(csk->user_data,
ee7255ad 843 ISCSI_ERR_TCP_CONN_CLOSE);
e3d2ad8c 844 read_unlock_bh(&csk->callback_lock);
9ba682f0 845 }
846}
847
848void cxgbi_sock_closed(struct cxgbi_sock *csk)
849{
850 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
851 csk, (csk)->state, (csk)->flags, (csk)->tid);
852 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
853 if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
854 return;
855 if (csk->saddr.sin_port)
856 sock_put_port(csk);
857 if (csk->dst)
858 dst_release(csk->dst);
859 csk->cdev->csk_release_offload_resources(csk);
860 cxgbi_sock_set_state(csk, CTP_CLOSED);
861 cxgbi_inform_iscsi_conn_closing(csk);
862 cxgbi_sock_put(csk);
863}
864EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
865
866static void need_active_close(struct cxgbi_sock *csk)
867{
868 int data_lost;
869 int close_req = 0;
870
871 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
872 csk, (csk)->state, (csk)->flags, (csk)->tid);
873 spin_lock_bh(&csk->lock);
e0f8e8cf
VP		 874 if (csk->dst)
875 dst_confirm(csk->dst);
9ba682f0 876 data_lost = skb_queue_len(&csk->receive_queue);
877 __skb_queue_purge(&csk->receive_queue);
878
879 if (csk->state == CTP_ACTIVE_OPEN)
880 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
881 else if (csk->state == CTP_ESTABLISHED) {
882 close_req = 1;
883 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
884 } else if (csk->state == CTP_PASSIVE_CLOSE) {
885 close_req = 1;
886 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
887 }
888
889 if (close_req) {
e0f8e8cf
VP		 890 if (!cxgbi_sock_flag(csk, CTPF_LOGOUT_RSP_RCVD) ||
891 data_lost)
9ba682f0 892 csk->cdev->csk_send_abort_req(csk);
893 else
894 csk->cdev->csk_send_close_req(csk);
895 }
896
897 spin_unlock_bh(&csk->lock);
898}
899
900void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
901{
902 pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
903 csk, csk->state, csk->flags,
904 &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
905 &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
906 errno);
907
908 cxgbi_sock_set_state(csk, CTP_CONNECTING);
909 csk->err = errno;
910 cxgbi_sock_closed(csk);
911}
912EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
913
914void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
915{
916 struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
1fe1fdb0 917 struct module *owner = csk->cdev->owner;
9ba682f0 918
919 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
920 csk, (csk)->state, (csk)->flags, (csk)->tid);
921 cxgbi_sock_get(csk);
922 spin_lock_bh(&csk->lock);
923 if (csk->state == CTP_ACTIVE_OPEN)
924 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
925 spin_unlock_bh(&csk->lock);
926 cxgbi_sock_put(csk);
927 __kfree_skb(skb);
1fe1fdb0
VP		 928
929 module_put(owner);
9ba682f0 930}
931EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
932
933void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
934{
935 cxgbi_sock_get(csk);
936 spin_lock_bh(&csk->lock);
7b07bf24
AB		 937
938 cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
9ba682f0 939 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
7b07bf24
AB		 940 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
941 if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
942 pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
943 csk, csk->state, csk->flags, csk->tid);
944 cxgbi_sock_closed(csk);
9ba682f0 945 }
7b07bf24 946
9ba682f0 947 spin_unlock_bh(&csk->lock);
948 cxgbi_sock_put(csk);
949}
950EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
951
952void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
953{
954 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
955 csk, (csk)->state, (csk)->flags, (csk)->tid);
956 cxgbi_sock_get(csk);
957 spin_lock_bh(&csk->lock);
958
959 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
960 goto done;
961
962 switch (csk->state) {
963 case CTP_ESTABLISHED:
964 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
965 break;
966 case CTP_ACTIVE_CLOSE:
967 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
968 break;
969 case CTP_CLOSE_WAIT_1:
970 cxgbi_sock_closed(csk);
971 break;
972 case CTP_ABORTING:
973 break;
974 default:
975 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
976 csk, csk->state, csk->flags, csk->tid);
977 }
978 cxgbi_inform_iscsi_conn_closing(csk);
979done:
980 spin_unlock_bh(&csk->lock);
981 cxgbi_sock_put(csk);
982}
983EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
984
985void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
986{
987 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
988 csk, (csk)->state, (csk)->flags, (csk)->tid);
989 cxgbi_sock_get(csk);
990 spin_lock_bh(&csk->lock);
991
992 csk->snd_una = snd_nxt - 1;
993 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
994 goto done;
995
996 switch (csk->state) {
997 case CTP_ACTIVE_CLOSE:
998 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
999 break;
1000 case CTP_CLOSE_WAIT_1:
1001 case CTP_CLOSE_WAIT_2:
1002 cxgbi_sock_closed(csk);
1003 break;
1004 case CTP_ABORTING:
1005 break;
1006 default:
1007 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
1008 csk, csk->state, csk->flags, csk->tid);
1009 }
1010done:
1011 spin_unlock_bh(&csk->lock);
1012 cxgbi_sock_put(csk);
1013}
1014EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
1015
1016void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
1017 unsigned int snd_una, int seq_chk)
1018{
1019 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1020 "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
1021 csk, csk->state, csk->flags, csk->tid, credits,
1022 csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
1023
1024 spin_lock_bh(&csk->lock);
1025
1026 csk->wr_cred += credits;
1027 if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
1028 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
1029
1030 while (credits) {
1031 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
1032
1033 if (unlikely(!p)) {
1034 pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
1035 csk, csk->state, csk->flags, csk->tid, credits,
1036 csk->wr_cred, csk->wr_una_cred);
1037 break;
1038 }
1039
1040 if (unlikely(credits < p->csum)) {
1041 pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
1042 csk, csk->state, csk->flags, csk->tid,
1043 credits, csk->wr_cred, csk->wr_una_cred,
1044 p->csum);
1045 p->csum -= credits;
1046 break;
1047 } else {
1048 cxgbi_sock_dequeue_wr(csk);
1049 credits -= p->csum;
1050 kfree_skb(p);
1051 }
1052 }
1053
1054 cxgbi_sock_check_wr_invariants(csk);
1055
1056 if (seq_chk) {
1057 if (unlikely(before(snd_una, csk->snd_una))) {
1058 pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
1059 csk, csk->state, csk->flags, csk->tid, snd_una,
1060 csk->snd_una);
1061 goto done;
1062 }
1063
1064 if (csk->snd_una != snd_una) {
1065 csk->snd_una = snd_una;
1066 dst_confirm(csk->dst);
1067 }
1068 }
1069
1070 if (skb_queue_len(&csk->write_queue)) {
1071 if (csk->cdev->csk_push_tx_frames(csk, 0))
1072 cxgbi_conn_tx_open(csk);
1073 } else
1074 cxgbi_conn_tx_open(csk);
1075done:
1076 spin_unlock_bh(&csk->lock);
1077}
1078EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
1079
1080static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
1081 unsigned short mtu)
1082{
1083 int i = 0;
1084
1085 while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
1086 ++i;
1087
1088 return i;
1089}
1090
1091unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
1092{
1093 unsigned int idx;
1094 struct dst_entry *dst = csk->dst;
1095
0dbaee3b 1096 csk->advmss = dst_metric_advmss(dst);
9ba682f0 1097
1098 if (csk->advmss > pmtu - 40)
1099 csk->advmss = pmtu - 40;
1100 if (csk->advmss < csk->cdev->mtus[0] - 40)
1101 csk->advmss = csk->cdev->mtus[0] - 40;
1102 idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
1103
1104 return idx;
1105}
1106EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
1107
1108void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
1109{
1110 cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
1111 __skb_queue_tail(&csk->write_queue, skb);
1112}
1113EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
1114
1115void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
1116{
1117 struct sk_buff *skb;
1118
1119 while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
1120 kfree_skb(skb);
1121}
1122EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
1123
1124void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
1125{
1126 int pending = cxgbi_sock_count_pending_wrs(csk);
1127
1128 if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
1129 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
1130 csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
1131}
1132EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
1133
1134static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
1135{
1136 struct cxgbi_device *cdev = csk->cdev;
1137 struct sk_buff *next;
1138 int err, copied = 0;
1139
1140 spin_lock_bh(&csk->lock);
1141
1142 if (csk->state != CTP_ESTABLISHED) {
1143 log_debug(1 << CXGBI_DBG_PDU_TX,
1144 "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
1145 csk, csk->state, csk->flags, csk->tid);
1146 err = -EAGAIN;
1147 goto out_err;
1148 }
1149
1150 if (csk->err) {
1151 log_debug(1 << CXGBI_DBG_PDU_TX,
1152 "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
1153 csk, csk->state, csk->flags, csk->tid, csk->err);
1154 err = -EPIPE;
1155 goto out_err;
1156 }
1157
81daf10c 1158 if (csk->write_seq - csk->snd_una >= csk->snd_win) {
9ba682f0 1159 log_debug(1 << CXGBI_DBG_PDU_TX,
1160 "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
1161 csk, csk->state, csk->flags, csk->tid, csk->write_seq,
81daf10c 1162 csk->snd_una, csk->snd_win);
9ba682f0 1163 err = -ENOBUFS;
1164 goto out_err;
1165 }
1166
1167 while (skb) {
1168 int frags = skb_shinfo(skb)->nr_frags +
1169 (skb->len != skb->data_len);
1170
1171 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
1172 pr_err("csk 0x%p, skb head %u < %u.\n",
1173 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
1174 err = -EINVAL;
1175 goto out_err;
1176 }
1177
1178 if (frags >= SKB_WR_LIST_SIZE) {
1179 pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
1180 csk, skb_shinfo(skb)->nr_frags, skb->len,
1181 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
1182 err = -EINVAL;
1183 goto out_err;
1184 }
1185
1186 next = skb->next;
1187 skb->next = NULL;
1188 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
1189 cxgbi_sock_skb_entail(csk, skb);
1190 copied += skb->len;
1191 csk->write_seq += skb->len +
1192 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
1193 skb = next;
1194 }
e0f8e8cf 1195
9ba682f0 1196 if (likely(skb_queue_len(&csk->write_queue)))
1197 cdev->csk_push_tx_frames(csk, 1);
e0f8e8cf 1198done:
9ba682f0 1199 spin_unlock_bh(&csk->lock);
1200 return copied;
1201
1202out_err:
1203 if (copied == 0 && err == -EPIPE)
1204 copied = csk->err ? csk->err : -EPIPE;
1205 else
1206 copied = err;
1207 goto done;
1208}
1209
71f7a00b
VP		 1210static inline void
1211scmd_get_params(struct scsi_cmnd *sc, struct scatterlist **sgl,
1212 unsigned int *sgcnt, unsigned int *dlen,
1213 unsigned int prot)
1214{
ae3d56d8 1215 struct scsi_data_buffer *sdb = prot ? scsi_prot(sc) : &sc->sdb;
71f7a00b
VP		 1216
1217 *sgl = sdb->table.sgl;
1218 *sgcnt = sdb->table.nents;
1219 *dlen = sdb->length;
1220 /* Caution: for protection sdb, sdb->length is invalid */
1221}
1222
1223void cxgbi_ddp_set_one_ppod(struct cxgbi_pagepod *ppod,
1224 struct cxgbi_task_tag_info *ttinfo,
1225 struct scatterlist **sg_pp, unsigned int *sg_off)
1226{
1227 struct scatterlist *sg = sg_pp ? *sg_pp : NULL;
1228 unsigned int offset = sg_off ? *sg_off : 0;
1229 dma_addr_t addr = 0UL;
1230 unsigned int len = 0;
1231 int i;
1232
1233 memcpy(ppod, &ttinfo->hdr, sizeof(struct cxgbi_pagepod_hdr));
1234
1235 if (sg) {
1236 addr = sg_dma_address(sg);
1237 len = sg_dma_len(sg);
1238 }
1239
1240 for (i = 0; i < PPOD_PAGES_MAX; i++) {
1241 if (sg) {
1242 ppod->addr[i] = cpu_to_be64(addr + offset);
1243 offset += PAGE_SIZE;
1244 if (offset == (len + sg->offset)) {
1245 offset = 0;
1246 sg = sg_next(sg);
1247 if (sg) {
1248 addr = sg_dma_address(sg);
1249 len = sg_dma_len(sg);
1250 }
1251 }
1252 } else {
1253 ppod->addr[i] = 0ULL;
1254 }
1255 }
1256
1257 /*
1258 * the fifth address needs to be repeated in the next ppod, so do
1259 * not move sg
1260 */
1261 if (sg_pp) {
1262 *sg_pp = sg;
1263 *sg_off = offset;
1264 }
1265
1266 if (offset == len) {
1267 offset = 0;
1268 sg = sg_next(sg);
1269 if (sg) {
1270 addr = sg_dma_address(sg);
1271 len = sg_dma_len(sg);
1272 }
1273 }
1274 ppod->addr[i] = sg ? cpu_to_be64(addr + offset) : 0ULL;
1275}
1276EXPORT_SYMBOL_GPL(cxgbi_ddp_set_one_ppod);
1277
9ba682f0 1278/*
1279 * APIs interacting with open-iscsi libraries
1280 */
1281
1282static unsigned char padding[4];
1283
71f7a00b
VP		 1284void cxgbi_ddp_ppm_setup(void **ppm_pp, struct cxgbi_device *cdev,
1285 struct cxgbi_tag_format *tformat, unsigned int ppmax,
1286 unsigned int llimit, unsigned int start,
1287 unsigned int rsvd_factor)
1288{
1289 int err = cxgbi_ppm_init(ppm_pp, cdev->ports[0], cdev->pdev,
1290 cdev->lldev, tformat, ppmax, llimit, start,
1291 rsvd_factor);
1292
1293 if (err >= 0) {
1294 struct cxgbi_ppm *ppm = (struct cxgbi_ppm *)(*ppm_pp);
1295
1296 if (ppm->ppmax < 1024 ||
1297 ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX)
1298 cdev->flags |= CXGBI_FLAG_DDP_OFF;
1299 err = 0;
1300 } else {
1301 cdev->flags |= CXGBI_FLAG_DDP_OFF;
1302 }
1303}
1304EXPORT_SYMBOL_GPL(cxgbi_ddp_ppm_setup);
1305
1306static int cxgbi_ddp_sgl_check(struct scatterlist *sgl, int nents)
1307{
1308 int i;
1309 int last_sgidx = nents - 1;
1310 struct scatterlist *sg = sgl;
1311
1312 for (i = 0; i < nents; i++, sg = sg_next(sg)) {
1313 unsigned int len = sg->length + sg->offset;
1314
1315 if ((sg->offset & 0x3) || (i && sg->offset) ||
1316 ((i != last_sgidx) && len != PAGE_SIZE)) {
1317 log_debug(1 << CXGBI_DBG_DDP,
1318 "sg %u/%u, %u,%u, not aligned.\n",
1319 i, nents, sg->offset, sg->length);
1320 goto err_out;
1321 }
1322 }
1323 return 0;
1324err_out:
1325 return -EINVAL;
1326}
1327
1328static int cxgbi_ddp_reserve(struct cxgbi_conn *cconn,
1329 struct cxgbi_task_data *tdata, u32 sw_tag,
1330 unsigned int xferlen)
1331{
1332 struct cxgbi_sock *csk = cconn->cep->csk;
1333 struct cxgbi_device *cdev = csk->cdev;
1334 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1335 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1336 struct scatterlist *sgl = ttinfo->sgl;
1337 unsigned int sgcnt = ttinfo->nents;
1338 unsigned int sg_offset = sgl->offset;
1339 int err;
1340
1341 if (cdev->flags & CXGBI_FLAG_DDP_OFF) {
1342 log_debug(1 << CXGBI_DBG_DDP,
1343 "cdev 0x%p DDP off.\n", cdev);
1344 return -EINVAL;
1345 }
1346
1347 if (!ppm || xferlen < DDP_THRESHOLD || !sgcnt ||
1348 ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX) {
1349 log_debug(1 << CXGBI_DBG_DDP,
1350 "ppm 0x%p, pgidx %u, xfer %u, sgcnt %u, NO ddp.\n",
1351 ppm, ppm ? ppm->tformat.pgsz_idx_dflt : DDP_PGIDX_MAX,
1352 xferlen, ttinfo->nents);
1353 return -EINVAL;
1354 }
1355
1356 /* make sure the buffer is suitable for ddp */
1357 if (cxgbi_ddp_sgl_check(sgl, sgcnt) < 0)
1358 return -EINVAL;
1359
1360 ttinfo->nr_pages = (xferlen + sgl->offset + (1 << PAGE_SHIFT) - 1) >>
1361 PAGE_SHIFT;
1362
1363 /*
1364 * the ddp tag will be used for the itt in the outgoing pdu,
1365 * the itt genrated by libiscsi is saved in the ppm and can be
1366 * retrieved via the ddp tag
1367 */
1368 err = cxgbi_ppm_ppods_reserve(ppm, ttinfo->nr_pages, 0, &ttinfo->idx,
1369 &ttinfo->tag, (unsigned long)sw_tag);
1370 if (err < 0) {
1371 cconn->ddp_full++;
1372 return err;
1373 }
1374 ttinfo->npods = err;
1375
1376 /* setup dma from scsi command sgl */
1377 sgl->offset = 0;
1378 err = dma_map_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1379 sgl->offset = sg_offset;
1380 if (err == 0) {
1381 pr_info("%s: 0x%x, xfer %u, sgl %u dma mapping err.\n",
1382 __func__, sw_tag, xferlen, sgcnt);
1383 goto rel_ppods;
1384 }
1385 if (err != ttinfo->nr_pages) {
1386 log_debug(1 << CXGBI_DBG_DDP,
1387 "%s: sw tag 0x%x, xfer %u, sgl %u, dma count %d.\n",
1388 __func__, sw_tag, xferlen, sgcnt, err);
1389 }
1390
1391 ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_MAPPED;
1392 ttinfo->cid = csk->port_id;
1393
1394 cxgbi_ppm_make_ppod_hdr(ppm, ttinfo->tag, csk->tid, sgl->offset,
1395 xferlen, &ttinfo->hdr);
1396
1397 if (cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ) {
1398 /* write ppod from xmit_pdu (of iscsi_scsi_command pdu) */
1399 ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_VALID;
1400 } else {
1401 /* write ppod from control queue now */
1402 err = cdev->csk_ddp_set_map(ppm, csk, ttinfo);
1403 if (err < 0)
1404 goto rel_ppods;
1405 }
1406
1407 return 0;
1408
1409rel_ppods:
1410 cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1411
1412 if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_MAPPED) {
1413 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_MAPPED;
1414 dma_unmap_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1415 }
1416 return -EINVAL;
1417}
1418
9ba682f0 1419static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1420{
71f7a00b
VP		 1421 struct scsi_cmnd *sc = task->sc;
1422 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1423 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1424 struct cxgbi_device *cdev = cconn->chba->cdev;
1425 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1426 u32 tag = ntohl((__force u32)hdr_itt);
1427
1428 log_debug(1 << CXGBI_DBG_DDP,
1429 "cdev 0x%p, task 0x%p, release tag 0x%x.\n",
1430 cdev, task, tag);
ae3d56d8 1431 if (sc && sc->sc_data_direction == DMA_FROM_DEVICE &&
71f7a00b
VP		 1432 cxgbi_ppm_is_ddp_tag(ppm, tag)) {
1433 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1434 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1435
1436 if (!(cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ))
1437 cdev->csk_ddp_clear_map(cdev, ppm, ttinfo);
1438 cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1439 dma_unmap_sg(&ppm->pdev->dev, ttinfo->sgl, ttinfo->nents,
1440 DMA_FROM_DEVICE);
1441 }
1442}
1443
1444static inline u32 cxgbi_build_sw_tag(u32 idx, u32 age)
1445{
1446 /* assume idx and age both are < 0x7FFF (32767) */
1447 return (idx << 16) | age;
9ba682f0 1448}
1449
1450static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1451{
71f7a00b
VP		 1452 struct scsi_cmnd *sc = task->sc;
1453 struct iscsi_conn *conn = task->conn;
1454 struct iscsi_session *sess = conn->session;
1455 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1456 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1457 struct cxgbi_device *cdev = cconn->chba->cdev;
1458 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1459 u32 sw_tag = cxgbi_build_sw_tag(task->itt, sess->age);
1460 u32 tag = 0;
1461 int err = -EINVAL;
1462
ae3d56d8 1463 if (sc && sc->sc_data_direction == DMA_FROM_DEVICE) {
71f7a00b
VP		 1464 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1465 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1466
1467 scmd_get_params(sc, &ttinfo->sgl, &ttinfo->nents,
1468 &tdata->dlen, 0);
1469 err = cxgbi_ddp_reserve(cconn, tdata, sw_tag, tdata->dlen);
1470 if (!err)
1471 tag = ttinfo->tag;
1472 else
1473 log_debug(1 << CXGBI_DBG_DDP,
1474 "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1475 cconn->cep->csk, task, tdata->dlen,
1476 ttinfo->nents);
1477 }
1478
1479 if (err < 0) {
1480 err = cxgbi_ppm_make_non_ddp_tag(ppm, sw_tag, &tag);
1481 if (err < 0)
1482 return err;
1483 }
1484 /* the itt need to sent in big-endian order */
1485 *hdr_itt = (__force itt_t)htonl(tag);
1486
1487 log_debug(1 << CXGBI_DBG_DDP,
1488 "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1489 cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
9ba682f0 1490 return 0;
1491}
1492
1493void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1494{
71f7a00b
VP		 1495 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1496 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1497 struct cxgbi_device *cdev = cconn->chba->cdev;
1498 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1499 u32 tag = ntohl((__force u32)itt);
1500 u32 sw_bits;
1501
1502 if (ppm) {
1503 if (cxgbi_ppm_is_ddp_tag(ppm, tag))
1504 sw_bits = cxgbi_ppm_get_tag_caller_data(ppm, tag);
1505 else
1506 sw_bits = cxgbi_ppm_decode_non_ddp_tag(ppm, tag);
1507 } else {
1508 sw_bits = tag;
1509 }
1510
1511 cxgbi_decode_sw_tag(sw_bits, idx, age);
1512 log_debug(1 << CXGBI_DBG_DDP,
1513 "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1514 cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1515 age ? *age : 0xFF);
9ba682f0 1516}
1517EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1518
1519void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1520{
1521 struct iscsi_conn *conn = csk->user_data;
1522
1523 if (conn) {
1524 log_debug(1 << CXGBI_DBG_SOCK,
1525 "csk 0x%p, cid %d.\n", csk, conn->id);
1526 iscsi_conn_queue_work(conn);
1527 }
1528}
1529EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1530
1531/*
1532 * pdu receive, interact with libiscsi_tcp
1533 */
1534static inline int read_pdu_skb(struct iscsi_conn *conn,
1535 struct sk_buff *skb,
1536 unsigned int offset,
1537 int offloaded)
1538{
1539 int status = 0;
1540 int bytes_read;
1541
1542 bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1543 switch (status) {
1544 case ISCSI_TCP_CONN_ERR:
1545 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1546 skb, offset, offloaded);
1547 return -EIO;
1548 case ISCSI_TCP_SUSPENDED:
1549 log_debug(1 << CXGBI_DBG_PDU_RX,
1550 "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1551 skb, offset, offloaded, bytes_read);
1552 /* no transfer - just have caller flush queue */
1553 return bytes_read;
1554 case ISCSI_TCP_SKB_DONE:
1555 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1556 skb, offset, offloaded);
1557 /*
1558 * pdus should always fit in the skb and we should get
1559 * segment done notifcation.
1560 */
1561 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1562 return -EFAULT;
1563 case ISCSI_TCP_SEGMENT_DONE:
1564 log_debug(1 << CXGBI_DBG_PDU_RX,
1565 "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1566 skb, offset, offloaded, bytes_read);
1567 return bytes_read;
1568 default:
1569 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1570 skb, offset, offloaded, status);
1571 return -EINVAL;
1572 }
1573}
1574
e0f8e8cf
VP		 1575static int
1576skb_read_pdu_bhs(struct cxgbi_sock *csk, struct iscsi_conn *conn,
1577 struct sk_buff *skb)
9ba682f0 1578{
1579 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
e0f8e8cf 1580 int err;
9ba682f0 1581
1582 log_debug(1 << CXGBI_DBG_PDU_RX,
1583 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1584 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1585
1586 if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1587 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1588 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1589 return -EIO;
1590 }
1591
1592 if (conn->hdrdgst_en &&
1593 cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1594 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1595 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1596 return -EIO;
1597 }
1598
44830d8f
VP		 1599 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_ISCSI_COMPL) &&
1600 cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA_DDPD)) {
1601 /* If completion flag is set and data is directly
1602 * placed in to the host memory then update
1603 * task->exp_datasn to the datasn in completion
1604 * iSCSI hdr as T6 adapter generates completion only
1605 * for the last pdu of a sequence.
1606 */
1607 itt_t itt = ((struct iscsi_data *)skb->data)->itt;
1608 struct iscsi_task *task = iscsi_itt_to_ctask(conn, itt);
1609 u32 data_sn = be32_to_cpu(((struct iscsi_data *)
1610 skb->data)->datasn);
1611 if (task && task->sc) {
1612 struct iscsi_tcp_task *tcp_task = task->dd_data;
1613
1614 tcp_task->exp_datasn = data_sn;
1615 }
1616 }
1617
e0f8e8cf
VP		 1618 err = read_pdu_skb(conn, skb, 0, 0);
1619 if (likely(err >= 0)) {
1620 struct iscsi_hdr *hdr = (struct iscsi_hdr *)skb->data;
1621 u8 opcode = hdr->opcode & ISCSI_OPCODE_MASK;
1622
1623 if (unlikely(opcode == ISCSI_OP_LOGOUT_RSP))
1624 cxgbi_sock_set_flag(csk, CTPF_LOGOUT_RSP_RCVD);
1625 }
1626
1627 return err;
9ba682f0 1628}
1629
1630static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1631 struct sk_buff *skb, unsigned int offset)
1632{
1633 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1634 bool offloaded = 0;
1635 int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1636
1637 log_debug(1 << CXGBI_DBG_PDU_RX,
1638 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1639 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1640
1641 if (conn->datadgst_en &&
1642 cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1643 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1644 conn, lskb, cxgbi_skcb_flags(lskb));
1645 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1646 return -EIO;
1647 }
1648
1649 if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1650 return 0;
1651
1652 /* coalesced, add header digest length */
1653 if (lskb == skb && conn->hdrdgst_en)
1654 offset += ISCSI_DIGEST_SIZE;
1655
1656 if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1657 offloaded = 1;
1658
1659 if (opcode == ISCSI_OP_SCSI_DATA_IN)
1660 log_debug(1 << CXGBI_DBG_PDU_RX,
1661 "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1662 skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1663 tcp_conn->in.datalen, offloaded ? "is" : "not");
1664
1665 return read_pdu_skb(conn, skb, offset, offloaded);
1666}
1667
1668static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1669{
1670 struct cxgbi_device *cdev = csk->cdev;
1671 int must_send;
1672 u32 credits;
1673
1674 log_debug(1 << CXGBI_DBG_PDU_RX,
fc385045 1675 "csk 0x%p,%u,0x%lx,%u, seq %u, wup %u, thre %u, %u.\n",
9ba682f0 1676 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1677 csk->rcv_wup, cdev->rx_credit_thres,
81daf10c 1678 csk->rcv_win);
9ba682f0 1679
586be7cb
VP		 1680 if (!cdev->rx_credit_thres)
1681 return;
1682
9ba682f0 1683 if (csk->state != CTP_ESTABLISHED)
1684 return;
1685
1686 credits = csk->copied_seq - csk->rcv_wup;
1687 if (unlikely(!credits))
1688 return;
81daf10c 1689 must_send = credits + 16384 >= csk->rcv_win;
9ba682f0 1690 if (must_send || credits >= cdev->rx_credit_thres)
1691 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1692}
1693
1694void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1695{
1696 struct cxgbi_device *cdev = csk->cdev;
1697 struct iscsi_conn *conn = csk->user_data;
1698 struct sk_buff *skb;
1699 unsigned int read = 0;
1700 int err = 0;
1701
1702 log_debug(1 << CXGBI_DBG_PDU_RX,
1703 "csk 0x%p, conn 0x%p.\n", csk, conn);
1704
1705 if (unlikely(!conn || conn->suspend_rx)) {
1706 log_debug(1 << CXGBI_DBG_PDU_RX,
1707 "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1708 csk, conn, conn ? conn->id : 0xFF,
1709 conn ? conn->suspend_rx : 0xFF);
9ba682f0 1710 return;
1711 }
1712
1713 while (!err) {
9ba682f0 1714 skb = skb_peek(&csk->receive_queue);
1715 if (!skb ||
1716 !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1717 if (skb)
1718 log_debug(1 << CXGBI_DBG_PDU_RX,
1719 "skb 0x%p, NOT ready 0x%lx.\n",
1720 skb, cxgbi_skcb_flags(skb));
9ba682f0 1721 break;
1722 }
1723 __skb_unlink(skb, &csk->receive_queue);
9ba682f0 1724
1725 read += cxgbi_skcb_rx_pdulen(skb);
1726 log_debug(1 << CXGBI_DBG_PDU_RX,
1727 "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1728 csk, skb, skb->len, cxgbi_skcb_flags(skb),
1729 cxgbi_skcb_rx_pdulen(skb));
1730
1731 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
e0f8e8cf 1732 err = skb_read_pdu_bhs(csk, conn, skb);
e3d2ad8c 1733 if (err < 0) {
1734 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1735 "f 0x%lx, plen %u.\n",
1736 csk, skb, skb->len,
1737 cxgbi_skcb_flags(skb),
1738 cxgbi_skcb_rx_pdulen(skb));
1739 goto skb_done;
1740 }
9ba682f0 1741 err = skb_read_pdu_data(conn, skb, skb,
1742 err + cdev->skb_rx_extra);
e3d2ad8c 1743 if (err < 0)
1744 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1745 "f 0x%lx, plen %u.\n",
1746 csk, skb, skb->len,
1747 cxgbi_skcb_flags(skb),
1748 cxgbi_skcb_rx_pdulen(skb));
9ba682f0 1749 } else {
e0f8e8cf 1750 err = skb_read_pdu_bhs(csk, conn, skb);
e3d2ad8c 1751 if (err < 0) {
1752 pr_err("bhs, 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 goto skb_done;
1758 }
1759
9ba682f0 1760 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1761 struct sk_buff *dskb;
1762
9ba682f0 1763 dskb = skb_peek(&csk->receive_queue);
1764 if (!dskb) {
e3d2ad8c 1765 pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1766 " plen %u, NO data.\n",
1767 csk, skb, skb->len,
1768 cxgbi_skcb_flags(skb),
1769 cxgbi_skcb_rx_pdulen(skb));
1770 err = -EIO;
1771 goto skb_done;
9ba682f0 1772 }
1773 __skb_unlink(dskb, &csk->receive_queue);
9ba682f0 1774
1775 err = skb_read_pdu_data(conn, skb, dskb, 0);
e3d2ad8c 1776 if (err < 0)
1777 pr_err("data, csk 0x%p, skb 0x%p,%u, "
1778 "f 0x%lx, plen %u, dskb 0x%p,"
1779 "%u.\n",
1780 csk, skb, skb->len,
1781 cxgbi_skcb_flags(skb),
1782 cxgbi_skcb_rx_pdulen(skb),
1783 dskb, dskb->len);
9ba682f0 1784 __kfree_skb(dskb);
1785 } else
1786 err = skb_read_pdu_data(conn, skb, skb, 0);
1787 }
e3d2ad8c 1788skb_done:
1789 __kfree_skb(skb);
1790
9ba682f0 1791 if (err < 0)
1792 break;
9ba682f0 1793 }
1794
1795 log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
1796 if (read) {
1797 csk->copied_seq += read;
1798 csk_return_rx_credits(csk, read);
1799 conn->rxdata_octets += read;
1800 }
1801
1802 if (err < 0) {
e3d2ad8c 1803 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
1804 csk, conn, err, read);
9ba682f0 1805 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1806 }
1807}
1808EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
1809
1810static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
1811 unsigned int offset, unsigned int *off,
1812 struct scatterlist **sgp)
1813{
1814 int i;
1815 struct scatterlist *sg;
1816
1817 for_each_sg(sgl, sg, sgcnt, i) {
1818 if (offset < sg->length) {
1819 *off = offset;
1820 *sgp = sg;
1821 return 0;
1822 }
1823 offset -= sg->length;
1824 }
1825 return -EFAULT;
1826}
1827
1828static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
6a39a16a 1829 unsigned int dlen, struct page_frag *frags,
9ba682f0 1830 int frag_max)
1831{
1832 unsigned int datalen = dlen;
1833 unsigned int sglen = sg->length - sgoffset;
1834 struct page *page = sg_page(sg);
1835 int i;
1836
1837 i = 0;
1838 do {
1839 unsigned int copy;
1840
1841 if (!sglen) {
1842 sg = sg_next(sg);
1843 if (!sg) {
1844 pr_warn("sg %d NULL, len %u/%u.\n",
1845 i, datalen, dlen);
1846 return -EINVAL;
1847 }
1848 sgoffset = 0;
1849 sglen = sg->length;
1850 page = sg_page(sg);
1851
1852 }
1853 copy = min(datalen, sglen);
1854 if (i && page == frags[i - 1].page &&
1855 sgoffset + sg->offset ==
6a39a16a
IC		 1856 frags[i - 1].offset + frags[i - 1].size) {
1857 frags[i - 1].size += copy;
9ba682f0 1858 } else {
1859 if (i >= frag_max) {
1860 pr_warn("too many pages %u, dlen %u.\n",
1861 frag_max, dlen);
1862 return -EINVAL;
1863 }
1864
1865 frags[i].page = page;
6a39a16a
IC		 1866 frags[i].offset = sg->offset + sgoffset;
1867 frags[i].size = copy;
9ba682f0 1868 i++;
1869 }
1870 datalen -= copy;
1871 sgoffset += copy;
1872 sglen -= copy;
1873 } while (datalen);
1874
1875 return i;
1876}
1877
1878int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
1879{
1880 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1881 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1882 struct cxgbi_device *cdev = cconn->chba->cdev;
1883 struct iscsi_conn *conn = task->conn;
1884 struct iscsi_tcp_task *tcp_task = task->dd_data;
e3d2ad8c 1885 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
9ba682f0 1886 struct scsi_cmnd *sc = task->sc;
22698483
VP		 1887 struct cxgbi_sock *csk = cconn->cep->csk;
1888 struct net_device *ndev = cdev->ports[csk->port_id];
9ba682f0 1889 int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
1890
1891 tcp_task->dd_data = tdata;
1892 task->hdr = NULL;
1893
1894 if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
1895 (opcode == ISCSI_OP_SCSI_DATA_OUT ||
1896 (opcode == ISCSI_OP_SCSI_CMD &&
ae3d56d8 1897 sc->sc_data_direction == DMA_TO_DEVICE)))
9ba682f0 1898 /* data could goes into skb head */
1899 headroom += min_t(unsigned int,
1900 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
1901 conn->max_xmit_dlength);
1902
1903 tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
1904 if (!tdata->skb) {
00c4a09b 1905 ndev->stats.tx_dropped++;
9ba682f0 1906 return -ENOMEM;
1907 }
1908
1909 skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
22698483
VP		 1910
1911 if (task->sc) {
1912 task->hdr = (struct iscsi_hdr *)tdata->skb->data;
1913 } else {
dd04b0f3 1914 task->hdr = kzalloc(SKB_TX_ISCSI_PDU_HEADER_MAX, GFP_ATOMIC);
22698483
VP		 1915 if (!task->hdr) {
1916 __kfree_skb(tdata->skb);
1917 tdata->skb = NULL;
1918 ndev->stats.tx_dropped++;
1919 return -ENOMEM;
1920 }
1921 }
9ba682f0 1922 task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
1923
1924 /* data_out uses scsi_cmd's itt */
1925 if (opcode != ISCSI_OP_SCSI_DATA_OUT)
1926 task_reserve_itt(task, &task->hdr->itt);
1927
1928 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1929 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
1930 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
1931 conn->max_xmit_dlength, ntohl(task->hdr->itt));
1932
1933 return 0;
1934}
1935EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
1936
1937static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
1938{
c343a01c 1939 if (hcrc || dcrc) {
1940 u8 submode = 0;
9ba682f0 1941
c343a01c 1942 if (hcrc)
1943 submode |= 1;
1944 if (dcrc)
1945 submode |= 2;
1946 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
1947 } else
1948 cxgbi_skcb_ulp_mode(skb) = 0;
9ba682f0 1949}
1950
1951int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
1952 unsigned int count)
1953{
1954 struct iscsi_conn *conn = task->conn;
e3d2ad8c 1955 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
9ba682f0 1956 struct sk_buff *skb = tdata->skb;
1957 unsigned int datalen = count;
1958 int i, padlen = iscsi_padding(count);
1959 struct page *pg;
1960
1961 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1962 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
1963 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
1964 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
1965
1966 skb_put(skb, task->hdr_len);
1967 tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
1968 if (!count)
1969 return 0;
1970
1971 if (task->sc) {
ae3d56d8 1972 struct scsi_data_buffer *sdb = &task->sc->sdb;
9ba682f0 1973 struct scatterlist *sg = NULL;
1974 int err;
1975
1976 tdata->offset = offset;
1977 tdata->count = count;
1978 err = sgl_seek_offset(
1979 sdb->table.sgl, sdb->table.nents,
1980 tdata->offset, &tdata->sgoffset, &sg);
1981 if (err < 0) {
1982 pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
1983 sdb->table.nents, tdata->offset, sdb->length);
1984 return err;
1985 }
1986 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
1987 tdata->frags, MAX_PDU_FRAGS);
1988 if (err < 0) {
1989 pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
1990 sdb->table.nents, tdata->offset, tdata->count);
1991 return err;
1992 }
1993 tdata->nr_frags = err;
1994
1995 if (tdata->nr_frags > MAX_SKB_FRAGS ||
1996 (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
1997 char *dst = skb->data + task->hdr_len;
6a39a16a 1998 struct page_frag *frag = tdata->frags;
9ba682f0 1999
2000 /* data fits in the skb's headroom */
2001 for (i = 0; i < tdata->nr_frags; i++, frag++) {
77dfce07 2002 char *src = kmap_atomic(frag->page);
9ba682f0 2003
6a39a16a
IC		 2004 memcpy(dst, src+frag->offset, frag->size);
2005 dst += frag->size;
77dfce07 2006 kunmap_atomic(src);
9ba682f0 2007 }
2008 if (padlen) {
2009 memset(dst, 0, padlen);
2010 padlen = 0;
2011 }
2012 skb_put(skb, count + padlen);
2013 } else {
2014 /* data fit into frag_list */
6a39a16a
IC		 2015 for (i = 0; i < tdata->nr_frags; i++) {
2016 __skb_fill_page_desc(skb, i,
2017 tdata->frags[i].page,
2018 tdata->frags[i].offset,
2019 tdata->frags[i].size);
2020 skb_frag_ref(skb, i);
2021 }
9ba682f0 2022 skb_shinfo(skb)->nr_frags = tdata->nr_frags;
2023 skb->len += count;
2024 skb->data_len += count;
2025 skb->truesize += count;
2026 }
2027
2028 } else {
2029 pg = virt_to_page(task->data);
2030
2031 get_page(pg);
2032 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
2033 count);
2034 skb->len += count;
2035 skb->data_len += count;
2036 skb->truesize += count;
2037 }
2038
2039 if (padlen) {
2040 i = skb_shinfo(skb)->nr_frags;
2041 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
2042 virt_to_page(padding), offset_in_page(padding),
2043 padlen);
2044
2045 skb->data_len += padlen;
2046 skb->truesize += padlen;
2047 skb->len += padlen;
2048 }
2049
2050 return 0;
2051}
2052EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
2053
2054int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2055{
2056 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2057 struct cxgbi_conn *cconn = tcp_conn->dd_data;
e3d2ad8c 2058 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
71f7a00b 2059 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
9ba682f0 2060 struct sk_buff *skb = tdata->skb;
71f7a00b 2061 struct cxgbi_sock *csk = NULL;
9ba682f0 2062 unsigned int datalen;
2063 int err;
2064
22698483 2065 if (!skb) {
9ba682f0 2066 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
22698483 2067 "task 0x%p\n", task);
9ba682f0 2068 return 0;
2069 }
2070
71f7a00b
VP		 2071 if (cconn && cconn->cep)
2072 csk = cconn->cep->csk;
2073 if (!csk) {
2074 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2075 "task 0x%p, csk gone.\n", task);
2076 return -EPIPE;
2077 }
2078
22698483 2079 tdata->skb = NULL;
9ba682f0 2080 datalen = skb->data_len;
71f7a00b
VP		 2081
2082 /* write ppod first if using ofldq to write ppod */
2083 if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_VALID) {
2084 struct cxgbi_ppm *ppm = csk->cdev->cdev2ppm(csk->cdev);
2085
2086 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_VALID;
2087 if (csk->cdev->csk_ddp_set_map(ppm, csk, ttinfo) < 0)
2088 pr_err("task 0x%p, ppod writing using ofldq failed.\n",
2089 task);
2090 /* continue. Let fl get the data */
2091 }
2092
22698483
VP		 2093 if (!task->sc)
2094 memcpy(skb->data, task->hdr, SKB_TX_ISCSI_PDU_HEADER_MAX);
2095
9ba682f0 2096 err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2097 if (err > 0) {
2098 int pdulen = err;
2099
2100 log_debug(1 << CXGBI_DBG_PDU_TX,
2101 "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2102 task, task->sc, skb, skb->len, skb->data_len, err);
2103
2104 if (task->conn->hdrdgst_en)
2105 pdulen += ISCSI_DIGEST_SIZE;
2106
2107 if (datalen && task->conn->datadgst_en)
2108 pdulen += ISCSI_DIGEST_SIZE;
2109
2110 task->conn->txdata_octets += pdulen;
2111 return 0;
2112 }
2113
2114 if (err == -EAGAIN || err == -ENOBUFS) {
2115 log_debug(1 << CXGBI_DBG_PDU_TX,
2116 "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2117 task, skb, skb->len, skb->data_len, err);
2118 /* reset skb to send when we are called again */
22698483 2119 tdata->skb = skb;
9ba682f0 2120 return err;
2121 }
2122
9ba682f0 2123 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2124 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2125 task->itt, skb, skb->len, skb->data_len, err);
ed481a33 2126
22698483 2127 __kfree_skb(skb);
ed481a33 2128
9ba682f0 2129 iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2130 iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2131 return err;
2132}
2133EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2134
2135void cxgbi_cleanup_task(struct iscsi_task *task)
2136{
71f7a00b 2137 struct iscsi_tcp_task *tcp_task = task->dd_data;
e3d2ad8c 2138 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
9ba682f0 2139
50292710
VP		 2140 if (!tcp_task || !tdata || (tcp_task->dd_data != tdata)) {
2141 pr_info("task 0x%p,0x%p, tcp_task 0x%p, tdata 0x%p/0x%p.\n",
2142 task, task->sc, tcp_task,
2143 tcp_task ? tcp_task->dd_data : NULL, tdata);
2144 return;
2145 }
2146
9ba682f0 2147 log_debug(1 << CXGBI_DBG_ISCSI,
2148 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2149 task, tdata->skb, task->hdr_itt);
2150
71f7a00b 2151 tcp_task->dd_data = NULL;
22698483
VP		 2152
2153 if (!task->sc)
2154 kfree(task->hdr);
2155 task->hdr = NULL;
2156
9ba682f0 2157 /* never reached the xmit task callout */
75b61250 2158 if (tdata->skb) {
22698483 2159 __kfree_skb(tdata->skb);
75b61250
VP		 2160 tdata->skb = NULL;
2161 }
9ba682f0 2162
2163 task_release_itt(task, task->hdr_itt);
69e2d1e6
VP		 2164 memset(tdata, 0, sizeof(*tdata));
2165
9ba682f0 2166 iscsi_tcp_cleanup_task(task);
2167}
2168EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2169
2170void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2171 struct iscsi_stats *stats)
2172{
2173 struct iscsi_conn *conn = cls_conn->dd_data;
2174
2175 stats->txdata_octets = conn->txdata_octets;
2176 stats->rxdata_octets = conn->rxdata_octets;
2177 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2178 stats->dataout_pdus = conn->dataout_pdus_cnt;
2179 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2180 stats->datain_pdus = conn->datain_pdus_cnt;
2181 stats->r2t_pdus = conn->r2t_pdus_cnt;
2182 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2183 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2184 stats->digest_err = 0;
2185 stats->timeout_err = 0;
2186 stats->custom_length = 1;
2187 strcpy(stats->custom[0].desc, "eh_abort_cnt");
2188 stats->custom[0].value = conn->eh_abort_cnt;
2189}
2190EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2191
2192static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2193{
2194 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2195 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2196 struct cxgbi_device *cdev = cconn->chba->cdev;
2197 unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2198 unsigned int max_def = 512 * MAX_SKB_FRAGS;
2199 unsigned int max = max(max_def, headroom);
2200
2201 max = min(cconn->chba->cdev->tx_max_size, max);
2202 if (conn->max_xmit_dlength)
2203 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2204 else
2205 conn->max_xmit_dlength = max;
2206 cxgbi_align_pdu_size(conn->max_xmit_dlength);
2207
2208 return 0;
2209}
2210
2211static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2212{
2213 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2214 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2215 unsigned int max = cconn->chba->cdev->rx_max_size;
2216
2217 cxgbi_align_pdu_size(max);
2218
2219 if (conn->max_recv_dlength) {
2220 if (conn->max_recv_dlength > max) {
2221 pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2222 conn->max_recv_dlength, max);
2223 return -EINVAL;
2224 }
2225 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2226 cxgbi_align_pdu_size(conn->max_recv_dlength);
2227 } else
2228 conn->max_recv_dlength = max;
2229
2230 return 0;
2231}
2232
2233int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2234 enum iscsi_param param, char *buf, int buflen)
2235{
2236 struct iscsi_conn *conn = cls_conn->dd_data;
9ba682f0 2237 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2238 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2239 struct cxgbi_sock *csk = cconn->cep->csk;
1304be5f 2240 int err;
9ba682f0 2241
2242 log_debug(1 << CXGBI_DBG_ISCSI,
2243 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2244 cls_conn, param, buflen, buf);
2245
2246 switch (param) {
2247 case ISCSI_PARAM_HDRDGST_EN:
2248 err = iscsi_set_param(cls_conn, param, buf, buflen);
2249 if (!err && conn->hdrdgst_en)
2250 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2251 conn->hdrdgst_en,
9e8f1c79 2252 conn->datadgst_en);
9ba682f0 2253 break;
2254 case ISCSI_PARAM_DATADGST_EN:
2255 err = iscsi_set_param(cls_conn, param, buf, buflen);
2256 if (!err && conn->datadgst_en)
2257 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2258 conn->hdrdgst_en,
9e8f1c79 2259 conn->datadgst_en);
9ba682f0 2260 break;
2261 case ISCSI_PARAM_MAX_R2T:
1304be5f 2262 return iscsi_tcp_set_max_r2t(conn, buf);
9ba682f0 2263 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2264 err = iscsi_set_param(cls_conn, param, buf, buflen);
2265 if (!err)
2266 err = cxgbi_conn_max_recv_dlength(conn);
2267 break;
2268 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2269 err = iscsi_set_param(cls_conn, param, buf, buflen);
2270 if (!err)
2271 err = cxgbi_conn_max_xmit_dlength(conn);
2272 break;
2273 default:
2274 return iscsi_set_param(cls_conn, param, buf, buflen);
2275 }
2276 return err;
2277}
2278EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2279
fc8d0590
AB		 2280static inline int csk_print_port(struct cxgbi_sock *csk, char *buf)
2281{
2282 int len;
2283
2284 cxgbi_sock_get(csk);
2285 len = sprintf(buf, "%hu\n", ntohs(csk->daddr.sin_port));
2286 cxgbi_sock_put(csk);
2287
2288 return len;
2289}
2290
2291static inline int csk_print_ip(struct cxgbi_sock *csk, char *buf)
2292{
2293 int len;
2294
2295 cxgbi_sock_get(csk);
2296 if (csk->csk_family == AF_INET)
2297 len = sprintf(buf, "%pI4",
2298 &csk->daddr.sin_addr.s_addr);
2299 else
2300 len = sprintf(buf, "%pI6",
2301 &csk->daddr6.sin6_addr);
2302
2303 cxgbi_sock_put(csk);
2304
2305 return len;
2306}
2307
c71b9b66
MC		 2308int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2309 char *buf)
9ba682f0 2310{
c71b9b66
MC		 2311 struct cxgbi_endpoint *cep = ep->dd_data;
2312 struct cxgbi_sock *csk;
9ba682f0 2313 int len;
2314
2315 log_debug(1 << CXGBI_DBG_ISCSI,
c71b9b66 2316 "cls_conn 0x%p, param %d.\n", ep, param);
9ba682f0 2317
2318 switch (param) {
2319 case ISCSI_PARAM_CONN_PORT:
9ba682f0 2320 case ISCSI_PARAM_CONN_ADDRESS:
c71b9b66
MC		 2321 if (!cep)
2322 return -ENOTCONN;
2323
2324 csk = cep->csk;
2325 if (!csk)
2326 return -ENOTCONN;
2327
2328 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2329 &csk->daddr, param, buf);
9ba682f0 2330 default:
c71b9b66 2331 return -ENOSYS;
9ba682f0 2332 }
2333 return len;
2334}
c71b9b66 2335EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
9ba682f0 2336
2337struct iscsi_cls_conn *
2338cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2339{
2340 struct iscsi_cls_conn *cls_conn;
2341 struct iscsi_conn *conn;
2342 struct iscsi_tcp_conn *tcp_conn;
2343 struct cxgbi_conn *cconn;
2344
2345 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2346 if (!cls_conn)
2347 return NULL;
2348
2349 conn = cls_conn->dd_data;
2350 tcp_conn = conn->dd_data;
2351 cconn = tcp_conn->dd_data;
2352 cconn->iconn = conn;
2353
2354 log_debug(1 << CXGBI_DBG_ISCSI,
2355 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2356 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2357
2358 return cls_conn;
2359}
2360EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2361
2362int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2363 struct iscsi_cls_conn *cls_conn,
2364 u64 transport_eph, int is_leading)
2365{
2366 struct iscsi_conn *conn = cls_conn->dd_data;
2367 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2368 struct cxgbi_conn *cconn = tcp_conn->dd_data;
71f7a00b 2369 struct cxgbi_ppm *ppm;
9ba682f0 2370 struct iscsi_endpoint *ep;
2371 struct cxgbi_endpoint *cep;
2372 struct cxgbi_sock *csk;
2373 int err;
2374
2375 ep = iscsi_lookup_endpoint(transport_eph);
2376 if (!ep)
2377 return -EINVAL;
2378
2379 /* setup ddp pagesize */
2380 cep = ep->dd_data;
2381 csk = cep->csk;
9ba682f0 2382
71f7a00b
VP		 2383 ppm = csk->cdev->cdev2ppm(csk->cdev);
2384 err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid,
9e8f1c79 2385 ppm->tformat.pgsz_idx_dflt);
71f7a00b
VP		 2386 if (err < 0)
2387 return err;
2388
9ba682f0 2389 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2390 if (err)
2391 return -EINVAL;
2392
2393 /* calculate the tag idx bits needed for this conn based on cmds_max */
2394 cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2395
e3d2ad8c 2396 write_lock_bh(&csk->callback_lock);
9ba682f0 2397 csk->user_data = conn;
2398 cconn->chba = cep->chba;
2399 cconn->cep = cep;
2400 cep->cconn = cconn;
e3d2ad8c 2401 write_unlock_bh(&csk->callback_lock);
9ba682f0 2402
2403 cxgbi_conn_max_xmit_dlength(conn);
2404 cxgbi_conn_max_recv_dlength(conn);
2405
9ba682f0 2406 log_debug(1 << CXGBI_DBG_ISCSI,
2407 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2408 cls_session, cls_conn, ep, cconn, csk);
2409 /* init recv engine */
2410 iscsi_tcp_hdr_recv_prep(tcp_conn);
2411
2412 return 0;
2413}
2414EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2415
2416struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2417 u16 cmds_max, u16 qdepth,
2418 u32 initial_cmdsn)
2419{
2420 struct cxgbi_endpoint *cep;
2421 struct cxgbi_hba *chba;
2422 struct Scsi_Host *shost;
2423 struct iscsi_cls_session *cls_session;
2424 struct iscsi_session *session;
2425
2426 if (!ep) {
2427 pr_err("missing endpoint.\n");
2428 return NULL;
2429 }
2430
2431 cep = ep->dd_data;
2432 chba = cep->chba;
2433 shost = chba->shost;
2434
2435 BUG_ON(chba != iscsi_host_priv(shost));
2436
2437 cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2438 cmds_max, 0,
2439 sizeof(struct iscsi_tcp_task) +
2440 sizeof(struct cxgbi_task_data),
2441 initial_cmdsn, ISCSI_MAX_TARGET);
2442 if (!cls_session)
2443 return NULL;
2444
2445 session = cls_session->dd_data;
2446 if (iscsi_tcp_r2tpool_alloc(session))
2447 goto remove_session;
2448
2449 log_debug(1 << CXGBI_DBG_ISCSI,
2450 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2451 return cls_session;
2452
2453remove_session:
2454 iscsi_session_teardown(cls_session);
2455 return NULL;
2456}
2457EXPORT_SYMBOL_GPL(cxgbi_create_session);
2458
2459void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2460{
2461 log_debug(1 << CXGBI_DBG_ISCSI,
2462 "cls sess 0x%p.\n", cls_session);
2463
2464 iscsi_tcp_r2tpool_free(cls_session->dd_data);
2465 iscsi_session_teardown(cls_session);
2466}
2467EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2468
2469int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2470 char *buf, int buflen)
2471{
2472 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2473
2474 if (!chba->ndev) {
2475 shost_printk(KERN_ERR, shost, "Could not get host param. "
2476 "netdev for host not set.\n");
2477 return -ENODEV;
2478 }
2479
2480 log_debug(1 << CXGBI_DBG_ISCSI,
2481 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2482 shost, chba, chba->ndev->name, param, buflen, buf);
2483
2484 switch (param) {
2485 case ISCSI_HOST_PARAM_IPADDRESS:
2486 {
2487 __be32 addr = in_aton(buf);
2488 log_debug(1 << CXGBI_DBG_ISCSI,
2489 "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2490 cxgbi_set_iscsi_ipv4(chba, addr);
2491 return 0;
2492 }
2493 case ISCSI_HOST_PARAM_HWADDRESS:
2494 case ISCSI_HOST_PARAM_NETDEV_NAME:
2495 return 0;
2496 default:
2497 return iscsi_host_set_param(shost, param, buf, buflen);
2498 }
2499}
2500EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2501
2502int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2503 char *buf)
2504{
2505 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2506 int len = 0;
2507
2508 if (!chba->ndev) {
2509 shost_printk(KERN_ERR, shost, "Could not get host param. "
2510 "netdev for host not set.\n");
2511 return -ENODEV;
2512 }
2513
2514 log_debug(1 << CXGBI_DBG_ISCSI,
2515 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2516 shost, chba, chba->ndev->name, param);
2517
2518 switch (param) {
2519 case ISCSI_HOST_PARAM_HWADDRESS:
2520 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2521 break;
2522 case ISCSI_HOST_PARAM_NETDEV_NAME:
2523 len = sprintf(buf, "%s\n", chba->ndev->name);
2524 break;
2525 case ISCSI_HOST_PARAM_IPADDRESS:
2526 {
dd9ad67e
AB		 2527 struct cxgbi_sock *csk = find_sock_on_port(chba->cdev,
2528 chba->port_id);
2529 if (csk) {
2530 len = sprintf(buf, "%pIS",
2531 (struct sockaddr *)&csk->saddr);
2532 }
9ba682f0 2533 log_debug(1 << CXGBI_DBG_ISCSI,
dd9ad67e 2534 "hba %s, addr %s.\n", chba->ndev->name, buf);
9ba682f0 2535 break;
2536 }
2537 default:
2538 return iscsi_host_get_param(shost, param, buf);
2539 }
2540
2541 return len;
2542}
2543EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2544
2545struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2546 struct sockaddr *dst_addr,
2547 int non_blocking)
2548{
2549 struct iscsi_endpoint *ep;
2550 struct cxgbi_endpoint *cep;
2551 struct cxgbi_hba *hba = NULL;
2552 struct cxgbi_sock *csk;
4737c5a0 2553 int ifindex = 0;
9ba682f0 2554 int err = -EINVAL;
2555
2556 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2557 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2558 shost, non_blocking, dst_addr);
2559
2560 if (shost) {
2561 hba = iscsi_host_priv(shost);
2562 if (!hba) {
2563 pr_info("shost 0x%p, priv NULL.\n", shost);
2564 goto err_out;
2565 }
4737c5a0 2566
4c2a0215
VP		 2567 rtnl_lock();
2568 if (!vlan_uses_dev(hba->ndev))
2569 ifindex = hba->ndev->ifindex;
2570 rtnl_unlock();
9ba682f0 2571 }
2572
fc8d0590 2573 if (dst_addr->sa_family == AF_INET) {
4737c5a0 2574 csk = cxgbi_check_route(dst_addr, ifindex);
e81fbf6c 2575#if IS_ENABLED(CONFIG_IPV6)
fc8d0590 2576 } else if (dst_addr->sa_family == AF_INET6) {
4737c5a0 2577 csk = cxgbi_check_route6(dst_addr, ifindex);
e81fbf6c 2578#endif
fc8d0590
AB		 2579 } else {
2580 pr_info("address family 0x%x NOT supported.\n",
2581 dst_addr->sa_family);
2582 err = -EAFNOSUPPORT;
2583 return (struct iscsi_endpoint *)ERR_PTR(err);
2584 }
2585
9ba682f0 2586 if (IS_ERR(csk))
2587 return (struct iscsi_endpoint *)csk;
2588 cxgbi_sock_get(csk);
2589
2590 if (!hba)
2591 hba = csk->cdev->hbas[csk->port_id];
2592 else if (hba != csk->cdev->hbas[csk->port_id]) {
2593 pr_info("Could not connect through requested host %u"
2594 "hba 0x%p != 0x%p (%u).\n",
2595 shost->host_no, hba,
2596 csk->cdev->hbas[csk->port_id], csk->port_id);
2597 err = -ENOSPC;
2598 goto release_conn;
2599 }
2600
2601 err = sock_get_port(csk);
2602 if (err)
2603 goto release_conn;
2604
2605 cxgbi_sock_set_state(csk, CTP_CONNECTING);
2606 err = csk->cdev->csk_init_act_open(csk);
2607 if (err)
2608 goto release_conn;
2609
2610 if (cxgbi_sock_is_closing(csk)) {
2611 err = -ENOSPC;
2612 pr_info("csk 0x%p is closing.\n", csk);
2613 goto release_conn;
2614 }
2615
2616 ep = iscsi_create_endpoint(sizeof(*cep));
2617 if (!ep) {
2618 err = -ENOMEM;
2619 pr_info("iscsi alloc ep, OOM.\n");
2620 goto release_conn;
2621 }
2622
2623 cep = ep->dd_data;
2624 cep->csk = csk;
2625 cep->chba = hba;
2626
2627 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2628 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2629 ep, cep, csk, hba, hba->ndev->name);
2630 return ep;
2631
2632release_conn:
2633 cxgbi_sock_put(csk);
2634 cxgbi_sock_closed(csk);
2635err_out:
2636 return ERR_PTR(err);
2637}
2638EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2639
2640int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2641{
2642 struct cxgbi_endpoint *cep = ep->dd_data;
2643 struct cxgbi_sock *csk = cep->csk;
2644
2645 if (!cxgbi_sock_is_established(csk))
2646 return 0;
2647 return 1;
2648}
2649EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2650
2651void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2652{
2653 struct cxgbi_endpoint *cep = ep->dd_data;
2654 struct cxgbi_conn *cconn = cep->cconn;
2655 struct cxgbi_sock *csk = cep->csk;
2656
2657 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2658 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2659 ep, cep, cconn, csk, csk->state, csk->flags);
2660
2661 if (cconn && cconn->iconn) {
2662 iscsi_suspend_tx(cconn->iconn);
2663 write_lock_bh(&csk->callback_lock);
2664 cep->csk->user_data = NULL;
2665 cconn->cep = NULL;
2666 write_unlock_bh(&csk->callback_lock);
2667 }
2668 iscsi_destroy_endpoint(ep);
2669
2670 if (likely(csk->state >= CTP_ESTABLISHED))
2671 need_active_close(csk);
2672 else
2673 cxgbi_sock_closed(csk);
2674
2675 cxgbi_sock_put(csk);
2676}
2677EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2678
2679int cxgbi_iscsi_init(struct iscsi_transport *itp,
2680 struct scsi_transport_template **stt)
2681{
2682 *stt = iscsi_register_transport(itp);
2683 if (*stt == NULL) {
2684 pr_err("unable to register %s transport 0x%p.\n",
2685 itp->name, itp);
2686 return -ENODEV;
2687 }
2688 log_debug(1 << CXGBI_DBG_ISCSI,
2689 "%s, registered iscsi transport 0x%p.\n",
2690 itp->name, stt);
2691 return 0;
2692}
2693EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2694
2695void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2696 struct scsi_transport_template **stt)
2697{
2698 if (*stt) {
2699 log_debug(1 << CXGBI_DBG_ISCSI,
2700 "de-register transport 0x%p, %s, stt 0x%p.\n",
2701 itp, itp->name, *stt);
2702 *stt = NULL;
2703 iscsi_unregister_transport(itp);
2704 }
2705}
2706EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2707
587a1f16 2708umode_t cxgbi_attr_is_visible(int param_type, int param)
3128c6c7
MC		 2709{
2710 switch (param_type) {
f27fb2ef
MC		 2711 case ISCSI_HOST_PARAM:
2712 switch (param) {
2713 case ISCSI_HOST_PARAM_NETDEV_NAME:
2714 case ISCSI_HOST_PARAM_HWADDRESS:
2715 case ISCSI_HOST_PARAM_IPADDRESS:
2716 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2717 return S_IRUGO;
2718 default:
2719 return 0;
2720 }
3128c6c7
MC		 2721 case ISCSI_PARAM:
2722 switch (param) {
2723 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2724 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2725 case ISCSI_PARAM_HDRDGST_EN:
2726 case ISCSI_PARAM_DATADGST_EN:
2727 case ISCSI_PARAM_CONN_ADDRESS:
2728 case ISCSI_PARAM_CONN_PORT:
2729 case ISCSI_PARAM_EXP_STATSN:
2730 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2731 case ISCSI_PARAM_PERSISTENT_PORT:
2732 case ISCSI_PARAM_PING_TMO:
2733 case ISCSI_PARAM_RECV_TMO:
1d063c17
MC		 2734 case ISCSI_PARAM_INITIAL_R2T_EN:
2735 case ISCSI_PARAM_MAX_R2T:
2736 case ISCSI_PARAM_IMM_DATA_EN:
2737 case ISCSI_PARAM_FIRST_BURST:
2738 case ISCSI_PARAM_MAX_BURST:
2739 case ISCSI_PARAM_PDU_INORDER_EN:
2740 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2741 case ISCSI_PARAM_ERL:
2742 case ISCSI_PARAM_TARGET_NAME:
2743 case ISCSI_PARAM_TPGT:
2744 case ISCSI_PARAM_USERNAME:
2745 case ISCSI_PARAM_PASSWORD:
2746 case ISCSI_PARAM_USERNAME_IN:
2747 case ISCSI_PARAM_PASSWORD_IN:
2748 case ISCSI_PARAM_FAST_ABORT:
2749 case ISCSI_PARAM_ABORT_TMO:
2750 case ISCSI_PARAM_LU_RESET_TMO:
2751 case ISCSI_PARAM_TGT_RESET_TMO:
2752 case ISCSI_PARAM_IFACE_NAME:
2753 case ISCSI_PARAM_INITIATOR_NAME:
3128c6c7
MC		 2754 return S_IRUGO;
2755 default:
2756 return 0;
2757 }
2758 }
2759
2760 return 0;
2761}
2762EXPORT_SYMBOL_GPL(cxgbi_attr_is_visible);
2763
9ba682f0 2764static int __init libcxgbi_init_module(void)
2765{
0ea5bf3d 2766 pr_info("%s", version);
75b61250
VP		 2767
2768 BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, cb) <
2769 sizeof(struct cxgbi_skb_cb));
9ba682f0 2770 return 0;
2771}
2772
2773static void __exit libcxgbi_exit_module(void)
2774{
2775 cxgbi_device_unregister_all(0xFF);
2776 return;
2777}
2778
2779module_init(libcxgbi_init_module);
2780module_exit(libcxgbi_exit_module);
Linux 6.x block layer and io_uring tree(s)