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scsi: remove bidirectional command support
[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);
9ba682f0 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,
4737c5a0
VP		 588 __be16 sport, __be16 dport, u8 tos,
589 int ifindex)
9ba682f0 590{
591 struct rtable *rt;
9ba682f0 592
f4bfd99f 593 rt = ip_route_output_ports(&init_net, fl4, NULL, daddr, saddr,
4737c5a0 594 dport, sport, IPPROTO_TCP, tos, ifindex);
b23dd4fe 595 if (IS_ERR(rt))
9ba682f0 596 return NULL;
597
598 return rt;
599}
600
4737c5a0
VP		 601static struct cxgbi_sock *
602cxgbi_check_route(struct sockaddr *dst_addr, int ifindex)
9ba682f0 603{
604 struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
605 struct dst_entry *dst;
606 struct net_device *ndev;
607 struct cxgbi_device *cdev;
608 struct rtable *rt = NULL;
a58b61e5 609 struct neighbour *n;
f4bfd99f 610 struct flowi4 fl4;
9ba682f0 611 struct cxgbi_sock *csk = NULL;
612 unsigned int mtu = 0;
613 int port = 0xFFFF;
614 int err = 0;
615
4737c5a0
VP		 616 rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0,
617 daddr->sin_port, 0, ifindex);
9ba682f0 618 if (!rt) {
619 pr_info("no route to ipv4 0x%x, port %u.\n",
fc8d0590
AB		 620 be32_to_cpu(daddr->sin_addr.s_addr),
621 be16_to_cpu(daddr->sin_port));
9ba682f0 622 err = -ENETUNREACH;
623 goto err_out;
624 }
625 dst = &rt->dst;
0b399d46 626 n = dst_neigh_lookup(dst, &daddr->sin_addr.s_addr);
a58b61e5
DM		 627 if (!n) {
628 err = -ENODEV;
629 goto rel_rt;
630 }
631 ndev = n->dev;
9ba682f0 632
633 if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
634 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
635 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
636 ndev->name);
637 err = -ENETUNREACH;
0b399d46 638 goto rel_neigh;
9ba682f0 639 }
640
641 if (ndev->flags & IFF_LOOPBACK) {
642 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
643 mtu = ndev->mtu;
644 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
a58b61e5 645 n->dev->name, ndev->name, mtu);
9ba682f0 646 }
647
165ae50e
VP		 648 if (!(ndev->flags & IFF_UP) || !netif_carrier_ok(ndev)) {
649 pr_info("%s interface not up.\n", ndev->name);
650 err = -ENETDOWN;
651 goto rel_neigh;
652 }
653
9ba682f0 654 cdev = cxgbi_device_find_by_netdev(ndev, &port);
655 if (!cdev) {
656 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
657 &daddr->sin_addr.s_addr, ndev->name);
658 err = -ENETUNREACH;
0b399d46 659 goto rel_neigh;
9ba682f0 660 }
661 log_debug(1 << CXGBI_DBG_SOCK,
662 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
663 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
664 port, ndev->name, cdev);
665
666 csk = cxgbi_sock_create(cdev);
667 if (!csk) {
668 err = -ENOMEM;
0b399d46 669 goto rel_neigh;
9ba682f0 670 }
671 csk->cdev = cdev;
672 csk->port_id = port;
673 csk->mtu = mtu;
674 csk->dst = dst;
fc8d0590
AB		 675
676 csk->csk_family = AF_INET;
9ba682f0 677 csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
678 csk->daddr.sin_port = daddr->sin_port;
c71b9b66 679 csk->daddr.sin_family = daddr->sin_family;
fc8d0590 680 csk->saddr.sin_family = daddr->sin_family;
f4bfd99f 681 csk->saddr.sin_addr.s_addr = fl4.saddr;
0b399d46 682 neigh_release(n);
9ba682f0 683
684 return csk;
685
0b399d46
DM		 686rel_neigh:
687 neigh_release(n);
688
9ba682f0 689rel_rt:
690 ip_rt_put(rt);
9ba682f0 691err_out:
692 return ERR_PTR(err);
693}
694
e81fbf6c 695#if IS_ENABLED(CONFIG_IPV6)
fc8d0590 696static struct rt6_info *find_route_ipv6(const struct in6_addr *saddr,
4737c5a0
VP		 697 const struct in6_addr *daddr,
698 int ifindex)
fc8d0590
AB		 699{
700 struct flowi6 fl;
701
3d6d30d6 702 memset(&fl, 0, sizeof(fl));
4737c5a0 703 fl.flowi6_oif = ifindex;
fc8d0590
AB		 704 if (saddr)
705 memcpy(&fl.saddr, saddr, sizeof(struct in6_addr));
706 if (daddr)
707 memcpy(&fl.daddr, daddr, sizeof(struct in6_addr));
708 return (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl);
709}
710
4737c5a0
VP		 711static struct cxgbi_sock *
712cxgbi_check_route6(struct sockaddr *dst_addr, int ifindex)
fc8d0590
AB		 713{
714 struct sockaddr_in6 *daddr6 = (struct sockaddr_in6 *)dst_addr;
715 struct dst_entry *dst;
716 struct net_device *ndev;
717 struct cxgbi_device *cdev;
718 struct rt6_info *rt = NULL;
719 struct neighbour *n;
720 struct in6_addr pref_saddr;
721 struct cxgbi_sock *csk = NULL;
722 unsigned int mtu = 0;
723 int port = 0xFFFF;
724 int err = 0;
725
4737c5a0 726 rt = find_route_ipv6(NULL, &daddr6->sin6_addr, ifindex);
fc8d0590
AB		 727
728 if (!rt) {
729 pr_info("no route to ipv6 %pI6 port %u\n",
730 daddr6->sin6_addr.s6_addr,
731 be16_to_cpu(daddr6->sin6_port));
732 err = -ENETUNREACH;
733 goto err_out;
734 }
735
736 dst = &rt->dst;
737
738 n = dst_neigh_lookup(dst, &daddr6->sin6_addr);
739
740 if (!n) {
741 pr_info("%pI6, port %u, dst no neighbour.\n",
742 daddr6->sin6_addr.s6_addr,
743 be16_to_cpu(daddr6->sin6_port));
744 err = -ENETUNREACH;
745 goto rel_rt;
746 }
747 ndev = n->dev;
748
165ae50e
VP		 749 if (!(ndev->flags & IFF_UP) || !netif_carrier_ok(ndev)) {
750 pr_info("%s interface not up.\n", ndev->name);
751 err = -ENETDOWN;
752 goto rel_rt;
753 }
754
fd0273d7 755 if (ipv6_addr_is_multicast(&daddr6->sin6_addr)) {
fc8d0590
AB		 756 pr_info("multi-cast route %pI6 port %u, dev %s.\n",
757 daddr6->sin6_addr.s6_addr,
758 ntohs(daddr6->sin6_port), ndev->name);
759 err = -ENETUNREACH;
760 goto rel_rt;
761 }
762
763 cdev = cxgbi_device_find_by_netdev(ndev, &port);
764 if (!cdev)
765 cdev = cxgbi_device_find_by_mac(ndev, &port);
766 if (!cdev) {
767 pr_info("dst %pI6 %s, NOT cxgbi device.\n",
768 daddr6->sin6_addr.s6_addr, ndev->name);
769 err = -ENETUNREACH;
770 goto rel_rt;
771 }
772 log_debug(1 << CXGBI_DBG_SOCK,
773 "route to %pI6 :%u, ndev p#%d,%s, cdev 0x%p.\n",
774 daddr6->sin6_addr.s6_addr, ntohs(daddr6->sin6_port), port,
775 ndev->name, cdev);
776
777 csk = cxgbi_sock_create(cdev);
778 if (!csk) {
779 err = -ENOMEM;
780 goto rel_rt;
781 }
782 csk->cdev = cdev;
783 csk->port_id = port;
784 csk->mtu = mtu;
785 csk->dst = dst;
786
67edf21e
DA		 787 rt6_get_prefsrc(rt, &pref_saddr);
788 if (ipv6_addr_any(&pref_saddr)) {
fc8d0590
AB		 789 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry *)rt);
790
791 err = ipv6_dev_get_saddr(&init_net, idev ? idev->dev : NULL,
792 &daddr6->sin6_addr, 0, &pref_saddr);
793 if (err) {
794 pr_info("failed to get source address to reach %pI6\n",
795 &daddr6->sin6_addr);
796 goto rel_rt;
797 }
fc8d0590
AB		 798 }
799
800 csk->csk_family = AF_INET6;
801 csk->daddr6.sin6_addr = daddr6->sin6_addr;
802 csk->daddr6.sin6_port = daddr6->sin6_port;
803 csk->daddr6.sin6_family = daddr6->sin6_family;
dd9ad67e 804 csk->saddr6.sin6_family = daddr6->sin6_family;
fc8d0590
AB		 805 csk->saddr6.sin6_addr = pref_saddr;
806
807 neigh_release(n);
808 return csk;
809
810rel_rt:
811 if (n)
812 neigh_release(n);
813
814 ip6_rt_put(rt);
815 if (csk)
816 cxgbi_sock_closed(csk);
817err_out:
818 return ERR_PTR(err);
819}
e81fbf6c 820#endif /* IS_ENABLED(CONFIG_IPV6) */
fc8d0590 821
9ba682f0 822void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
823 unsigned int opt)
824{
825 csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
826 dst_confirm(csk->dst);
827 smp_mb();
828 cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
829}
830EXPORT_SYMBOL_GPL(cxgbi_sock_established);
831
832static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
833{
834 log_debug(1 << CXGBI_DBG_SOCK,
835 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
836 csk, csk->state, csk->flags, csk->user_data);
837
838 if (csk->state != CTP_ESTABLISHED) {
e3d2ad8c 839 read_lock_bh(&csk->callback_lock);
9ba682f0 840 if (csk->user_data)
841 iscsi_conn_failure(csk->user_data,
ee7255ad 842 ISCSI_ERR_TCP_CONN_CLOSE);
e3d2ad8c 843 read_unlock_bh(&csk->callback_lock);
9ba682f0 844 }
845}
846
847void cxgbi_sock_closed(struct cxgbi_sock *csk)
848{
849 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
850 csk, (csk)->state, (csk)->flags, (csk)->tid);
851 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
852 if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
853 return;
854 if (csk->saddr.sin_port)
855 sock_put_port(csk);
856 if (csk->dst)
857 dst_release(csk->dst);
858 csk->cdev->csk_release_offload_resources(csk);
859 cxgbi_sock_set_state(csk, CTP_CLOSED);
860 cxgbi_inform_iscsi_conn_closing(csk);
861 cxgbi_sock_put(csk);
862}
863EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
864
865static void need_active_close(struct cxgbi_sock *csk)
866{
867 int data_lost;
868 int close_req = 0;
869
870 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
871 csk, (csk)->state, (csk)->flags, (csk)->tid);
872 spin_lock_bh(&csk->lock);
e0f8e8cf
VP		 873 if (csk->dst)
874 dst_confirm(csk->dst);
9ba682f0 875 data_lost = skb_queue_len(&csk->receive_queue);
876 __skb_queue_purge(&csk->receive_queue);
877
878 if (csk->state == CTP_ACTIVE_OPEN)
879 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
880 else if (csk->state == CTP_ESTABLISHED) {
881 close_req = 1;
882 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
883 } else if (csk->state == CTP_PASSIVE_CLOSE) {
884 close_req = 1;
885 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
886 }
887
888 if (close_req) {
e0f8e8cf
VP		 889 if (!cxgbi_sock_flag(csk, CTPF_LOGOUT_RSP_RCVD) ||
890 data_lost)
9ba682f0 891 csk->cdev->csk_send_abort_req(csk);
892 else
893 csk->cdev->csk_send_close_req(csk);
894 }
895
896 spin_unlock_bh(&csk->lock);
897}
898
899void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
900{
901 pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
902 csk, csk->state, csk->flags,
903 &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
904 &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
905 errno);
906
907 cxgbi_sock_set_state(csk, CTP_CONNECTING);
908 csk->err = errno;
909 cxgbi_sock_closed(csk);
910}
911EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
912
913void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
914{
915 struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
1fe1fdb0 916 struct module *owner = csk->cdev->owner;
9ba682f0 917
918 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
919 csk, (csk)->state, (csk)->flags, (csk)->tid);
920 cxgbi_sock_get(csk);
921 spin_lock_bh(&csk->lock);
922 if (csk->state == CTP_ACTIVE_OPEN)
923 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
924 spin_unlock_bh(&csk->lock);
925 cxgbi_sock_put(csk);
926 __kfree_skb(skb);
1fe1fdb0
VP		 927
928 module_put(owner);
9ba682f0 929}
930EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
931
932void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
933{
934 cxgbi_sock_get(csk);
935 spin_lock_bh(&csk->lock);
7b07bf24
AB		 936
937 cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
9ba682f0 938 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
7b07bf24
AB		 939 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
940 if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
941 pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
942 csk, csk->state, csk->flags, csk->tid);
943 cxgbi_sock_closed(csk);
9ba682f0 944 }
7b07bf24 945
9ba682f0 946 spin_unlock_bh(&csk->lock);
947 cxgbi_sock_put(csk);
948}
949EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
950
951void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
952{
953 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
954 csk, (csk)->state, (csk)->flags, (csk)->tid);
955 cxgbi_sock_get(csk);
956 spin_lock_bh(&csk->lock);
957
958 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
959 goto done;
960
961 switch (csk->state) {
962 case CTP_ESTABLISHED:
963 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
964 break;
965 case CTP_ACTIVE_CLOSE:
966 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
967 break;
968 case CTP_CLOSE_WAIT_1:
969 cxgbi_sock_closed(csk);
970 break;
971 case CTP_ABORTING:
972 break;
973 default:
974 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
975 csk, csk->state, csk->flags, csk->tid);
976 }
977 cxgbi_inform_iscsi_conn_closing(csk);
978done:
979 spin_unlock_bh(&csk->lock);
980 cxgbi_sock_put(csk);
981}
982EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
983
984void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
985{
986 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
987 csk, (csk)->state, (csk)->flags, (csk)->tid);
988 cxgbi_sock_get(csk);
989 spin_lock_bh(&csk->lock);
990
991 csk->snd_una = snd_nxt - 1;
992 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
993 goto done;
994
995 switch (csk->state) {
996 case CTP_ACTIVE_CLOSE:
997 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
998 break;
999 case CTP_CLOSE_WAIT_1:
1000 case CTP_CLOSE_WAIT_2:
1001 cxgbi_sock_closed(csk);
1002 break;
1003 case CTP_ABORTING:
1004 break;
1005 default:
1006 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
1007 csk, csk->state, csk->flags, csk->tid);
1008 }
1009done:
1010 spin_unlock_bh(&csk->lock);
1011 cxgbi_sock_put(csk);
1012}
1013EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
1014
1015void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
1016 unsigned int snd_una, int seq_chk)
1017{
1018 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1019 "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
1020 csk, csk->state, csk->flags, csk->tid, credits,
1021 csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
1022
1023 spin_lock_bh(&csk->lock);
1024
1025 csk->wr_cred += credits;
1026 if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
1027 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
1028
1029 while (credits) {
1030 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
1031
1032 if (unlikely(!p)) {
1033 pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
1034 csk, csk->state, csk->flags, csk->tid, credits,
1035 csk->wr_cred, csk->wr_una_cred);
1036 break;
1037 }
1038
1039 if (unlikely(credits < p->csum)) {
1040 pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
1041 csk, csk->state, csk->flags, csk->tid,
1042 credits, csk->wr_cred, csk->wr_una_cred,
1043 p->csum);
1044 p->csum -= credits;
1045 break;
1046 } else {
1047 cxgbi_sock_dequeue_wr(csk);
1048 credits -= p->csum;
1049 kfree_skb(p);
1050 }
1051 }
1052
1053 cxgbi_sock_check_wr_invariants(csk);
1054
1055 if (seq_chk) {
1056 if (unlikely(before(snd_una, csk->snd_una))) {
1057 pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
1058 csk, csk->state, csk->flags, csk->tid, snd_una,
1059 csk->snd_una);
1060 goto done;
1061 }
1062
1063 if (csk->snd_una != snd_una) {
1064 csk->snd_una = snd_una;
1065 dst_confirm(csk->dst);
1066 }
1067 }
1068
1069 if (skb_queue_len(&csk->write_queue)) {
1070 if (csk->cdev->csk_push_tx_frames(csk, 0))
1071 cxgbi_conn_tx_open(csk);
1072 } else
1073 cxgbi_conn_tx_open(csk);
1074done:
1075 spin_unlock_bh(&csk->lock);
1076}
1077EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
1078
1079static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
1080 unsigned short mtu)
1081{
1082 int i = 0;
1083
1084 while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
1085 ++i;
1086
1087 return i;
1088}
1089
1090unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
1091{
1092 unsigned int idx;
1093 struct dst_entry *dst = csk->dst;
1094
0dbaee3b 1095 csk->advmss = dst_metric_advmss(dst);
9ba682f0 1096
1097 if (csk->advmss > pmtu - 40)
1098 csk->advmss = pmtu - 40;
1099 if (csk->advmss < csk->cdev->mtus[0] - 40)
1100 csk->advmss = csk->cdev->mtus[0] - 40;
1101 idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
1102
1103 return idx;
1104}
1105EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
1106
1107void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
1108{
1109 cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
1110 __skb_queue_tail(&csk->write_queue, skb);
1111}
1112EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
1113
1114void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
1115{
1116 struct sk_buff *skb;
1117
1118 while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
1119 kfree_skb(skb);
1120}
1121EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
1122
1123void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
1124{
1125 int pending = cxgbi_sock_count_pending_wrs(csk);
1126
1127 if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
1128 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
1129 csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
1130}
1131EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
1132
1133static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
1134{
1135 struct cxgbi_device *cdev = csk->cdev;
1136 struct sk_buff *next;
1137 int err, copied = 0;
1138
1139 spin_lock_bh(&csk->lock);
1140
1141 if (csk->state != CTP_ESTABLISHED) {
1142 log_debug(1 << CXGBI_DBG_PDU_TX,
1143 "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
1144 csk, csk->state, csk->flags, csk->tid);
1145 err = -EAGAIN;
1146 goto out_err;
1147 }
1148
1149 if (csk->err) {
1150 log_debug(1 << CXGBI_DBG_PDU_TX,
1151 "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
1152 csk, csk->state, csk->flags, csk->tid, csk->err);
1153 err = -EPIPE;
1154 goto out_err;
1155 }
1156
81daf10c 1157 if (csk->write_seq - csk->snd_una >= csk->snd_win) {
9ba682f0 1158 log_debug(1 << CXGBI_DBG_PDU_TX,
1159 "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
1160 csk, csk->state, csk->flags, csk->tid, csk->write_seq,
81daf10c 1161 csk->snd_una, csk->snd_win);
9ba682f0 1162 err = -ENOBUFS;
1163 goto out_err;
1164 }
1165
1166 while (skb) {
1167 int frags = skb_shinfo(skb)->nr_frags +
1168 (skb->len != skb->data_len);
1169
1170 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
1171 pr_err("csk 0x%p, skb head %u < %u.\n",
1172 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
1173 err = -EINVAL;
1174 goto out_err;
1175 }
1176
1177 if (frags >= SKB_WR_LIST_SIZE) {
1178 pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
1179 csk, skb_shinfo(skb)->nr_frags, skb->len,
1180 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
1181 err = -EINVAL;
1182 goto out_err;
1183 }
1184
1185 next = skb->next;
1186 skb->next = NULL;
1187 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
1188 cxgbi_sock_skb_entail(csk, skb);
1189 copied += skb->len;
1190 csk->write_seq += skb->len +
1191 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
1192 skb = next;
1193 }
e0f8e8cf 1194
9ba682f0 1195 if (likely(skb_queue_len(&csk->write_queue)))
1196 cdev->csk_push_tx_frames(csk, 1);
e0f8e8cf 1197done:
9ba682f0 1198 spin_unlock_bh(&csk->lock);
1199 return copied;
1200
1201out_err:
1202 if (copied == 0 && err == -EPIPE)
1203 copied = csk->err ? csk->err : -EPIPE;
1204 else
1205 copied = err;
1206 goto done;
1207}
1208
71f7a00b
VP		 1209static inline void
1210scmd_get_params(struct scsi_cmnd *sc, struct scatterlist **sgl,
1211 unsigned int *sgcnt, unsigned int *dlen,
1212 unsigned int prot)
1213{
ae3d56d8 1214 struct scsi_data_buffer *sdb = prot ? scsi_prot(sc) : &sc->sdb;
71f7a00b
VP		 1215
1216 *sgl = sdb->table.sgl;
1217 *sgcnt = sdb->table.nents;
1218 *dlen = sdb->length;
1219 /* Caution: for protection sdb, sdb->length is invalid */
1220}
1221
1222void cxgbi_ddp_set_one_ppod(struct cxgbi_pagepod *ppod,
1223 struct cxgbi_task_tag_info *ttinfo,
1224 struct scatterlist **sg_pp, unsigned int *sg_off)
1225{
1226 struct scatterlist *sg = sg_pp ? *sg_pp : NULL;
1227 unsigned int offset = sg_off ? *sg_off : 0;
1228 dma_addr_t addr = 0UL;
1229 unsigned int len = 0;
1230 int i;
1231
1232 memcpy(ppod, &ttinfo->hdr, sizeof(struct cxgbi_pagepod_hdr));
1233
1234 if (sg) {
1235 addr = sg_dma_address(sg);
1236 len = sg_dma_len(sg);
1237 }
1238
1239 for (i = 0; i < PPOD_PAGES_MAX; i++) {
1240 if (sg) {
1241 ppod->addr[i] = cpu_to_be64(addr + offset);
1242 offset += PAGE_SIZE;
1243 if (offset == (len + sg->offset)) {
1244 offset = 0;
1245 sg = sg_next(sg);
1246 if (sg) {
1247 addr = sg_dma_address(sg);
1248 len = sg_dma_len(sg);
1249 }
1250 }
1251 } else {
1252 ppod->addr[i] = 0ULL;
1253 }
1254 }
1255
1256 /*
1257 * the fifth address needs to be repeated in the next ppod, so do
1258 * not move sg
1259 */
1260 if (sg_pp) {
1261 *sg_pp = sg;
1262 *sg_off = offset;
1263 }
1264
1265 if (offset == len) {
1266 offset = 0;
1267 sg = sg_next(sg);
1268 if (sg) {
1269 addr = sg_dma_address(sg);
1270 len = sg_dma_len(sg);
1271 }
1272 }
1273 ppod->addr[i] = sg ? cpu_to_be64(addr + offset) : 0ULL;
1274}
1275EXPORT_SYMBOL_GPL(cxgbi_ddp_set_one_ppod);
1276
9ba682f0 1277/*
1278 * APIs interacting with open-iscsi libraries
1279 */
1280
1281static unsigned char padding[4];
1282
71f7a00b
VP		 1283void cxgbi_ddp_ppm_setup(void **ppm_pp, struct cxgbi_device *cdev,
1284 struct cxgbi_tag_format *tformat, unsigned int ppmax,
1285 unsigned int llimit, unsigned int start,
1286 unsigned int rsvd_factor)
1287{
1288 int err = cxgbi_ppm_init(ppm_pp, cdev->ports[0], cdev->pdev,
1289 cdev->lldev, tformat, ppmax, llimit, start,
1290 rsvd_factor);
1291
1292 if (err >= 0) {
1293 struct cxgbi_ppm *ppm = (struct cxgbi_ppm *)(*ppm_pp);
1294
1295 if (ppm->ppmax < 1024 ||
1296 ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX)
1297 cdev->flags |= CXGBI_FLAG_DDP_OFF;
1298 err = 0;
1299 } else {
1300 cdev->flags |= CXGBI_FLAG_DDP_OFF;
1301 }
1302}
1303EXPORT_SYMBOL_GPL(cxgbi_ddp_ppm_setup);
1304
1305static int cxgbi_ddp_sgl_check(struct scatterlist *sgl, int nents)
1306{
1307 int i;
1308 int last_sgidx = nents - 1;
1309 struct scatterlist *sg = sgl;
1310
1311 for (i = 0; i < nents; i++, sg = sg_next(sg)) {
1312 unsigned int len = sg->length + sg->offset;
1313
1314 if ((sg->offset & 0x3) || (i && sg->offset) ||
1315 ((i != last_sgidx) && len != PAGE_SIZE)) {
1316 log_debug(1 << CXGBI_DBG_DDP,
1317 "sg %u/%u, %u,%u, not aligned.\n",
1318 i, nents, sg->offset, sg->length);
1319 goto err_out;
1320 }
1321 }
1322 return 0;
1323err_out:
1324 return -EINVAL;
1325}
1326
1327static int cxgbi_ddp_reserve(struct cxgbi_conn *cconn,
1328 struct cxgbi_task_data *tdata, u32 sw_tag,
1329 unsigned int xferlen)
1330{
1331 struct cxgbi_sock *csk = cconn->cep->csk;
1332 struct cxgbi_device *cdev = csk->cdev;
1333 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1334 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1335 struct scatterlist *sgl = ttinfo->sgl;
1336 unsigned int sgcnt = ttinfo->nents;
1337 unsigned int sg_offset = sgl->offset;
1338 int err;
1339
1340 if (cdev->flags & CXGBI_FLAG_DDP_OFF) {
1341 log_debug(1 << CXGBI_DBG_DDP,
1342 "cdev 0x%p DDP off.\n", cdev);
1343 return -EINVAL;
1344 }
1345
1346 if (!ppm || xferlen < DDP_THRESHOLD || !sgcnt ||
1347 ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX) {
1348 log_debug(1 << CXGBI_DBG_DDP,
1349 "ppm 0x%p, pgidx %u, xfer %u, sgcnt %u, NO ddp.\n",
1350 ppm, ppm ? ppm->tformat.pgsz_idx_dflt : DDP_PGIDX_MAX,
1351 xferlen, ttinfo->nents);
1352 return -EINVAL;
1353 }
1354
1355 /* make sure the buffer is suitable for ddp */
1356 if (cxgbi_ddp_sgl_check(sgl, sgcnt) < 0)
1357 return -EINVAL;
1358
1359 ttinfo->nr_pages = (xferlen + sgl->offset + (1 << PAGE_SHIFT) - 1) >>
1360 PAGE_SHIFT;
1361
1362 /*
1363 * the ddp tag will be used for the itt in the outgoing pdu,
1364 * the itt genrated by libiscsi is saved in the ppm and can be
1365 * retrieved via the ddp tag
1366 */
1367 err = cxgbi_ppm_ppods_reserve(ppm, ttinfo->nr_pages, 0, &ttinfo->idx,
1368 &ttinfo->tag, (unsigned long)sw_tag);
1369 if (err < 0) {
1370 cconn->ddp_full++;
1371 return err;
1372 }
1373 ttinfo->npods = err;
1374
1375 /* setup dma from scsi command sgl */
1376 sgl->offset = 0;
1377 err = dma_map_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1378 sgl->offset = sg_offset;
1379 if (err == 0) {
1380 pr_info("%s: 0x%x, xfer %u, sgl %u dma mapping err.\n",
1381 __func__, sw_tag, xferlen, sgcnt);
1382 goto rel_ppods;
1383 }
1384 if (err != ttinfo->nr_pages) {
1385 log_debug(1 << CXGBI_DBG_DDP,
1386 "%s: sw tag 0x%x, xfer %u, sgl %u, dma count %d.\n",
1387 __func__, sw_tag, xferlen, sgcnt, err);
1388 }
1389
1390 ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_MAPPED;
1391 ttinfo->cid = csk->port_id;
1392
1393 cxgbi_ppm_make_ppod_hdr(ppm, ttinfo->tag, csk->tid, sgl->offset,
1394 xferlen, &ttinfo->hdr);
1395
1396 if (cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ) {
1397 /* write ppod from xmit_pdu (of iscsi_scsi_command pdu) */
1398 ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_VALID;
1399 } else {
1400 /* write ppod from control queue now */
1401 err = cdev->csk_ddp_set_map(ppm, csk, ttinfo);
1402 if (err < 0)
1403 goto rel_ppods;
1404 }
1405
1406 return 0;
1407
1408rel_ppods:
1409 cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1410
1411 if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_MAPPED) {
1412 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_MAPPED;
1413 dma_unmap_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1414 }
1415 return -EINVAL;
1416}
1417
9ba682f0 1418static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1419{
71f7a00b
VP		 1420 struct scsi_cmnd *sc = task->sc;
1421 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1422 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1423 struct cxgbi_device *cdev = cconn->chba->cdev;
1424 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1425 u32 tag = ntohl((__force u32)hdr_itt);
1426
1427 log_debug(1 << CXGBI_DBG_DDP,
1428 "cdev 0x%p, task 0x%p, release tag 0x%x.\n",
1429 cdev, task, tag);
ae3d56d8 1430 if (sc && sc->sc_data_direction == DMA_FROM_DEVICE &&
71f7a00b
VP		 1431 cxgbi_ppm_is_ddp_tag(ppm, tag)) {
1432 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1433 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1434
1435 if (!(cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ))
1436 cdev->csk_ddp_clear_map(cdev, ppm, ttinfo);
1437 cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1438 dma_unmap_sg(&ppm->pdev->dev, ttinfo->sgl, ttinfo->nents,
1439 DMA_FROM_DEVICE);
1440 }
1441}
1442
1443static inline u32 cxgbi_build_sw_tag(u32 idx, u32 age)
1444{
1445 /* assume idx and age both are < 0x7FFF (32767) */
1446 return (idx << 16) | age;
9ba682f0 1447}
1448
1449static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1450{
71f7a00b
VP		 1451 struct scsi_cmnd *sc = task->sc;
1452 struct iscsi_conn *conn = task->conn;
1453 struct iscsi_session *sess = conn->session;
1454 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1455 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1456 struct cxgbi_device *cdev = cconn->chba->cdev;
1457 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1458 u32 sw_tag = cxgbi_build_sw_tag(task->itt, sess->age);
1459 u32 tag = 0;
1460 int err = -EINVAL;
1461
ae3d56d8 1462 if (sc && sc->sc_data_direction == DMA_FROM_DEVICE) {
71f7a00b
VP		 1463 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1464 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1465
1466 scmd_get_params(sc, &ttinfo->sgl, &ttinfo->nents,
1467 &tdata->dlen, 0);
1468 err = cxgbi_ddp_reserve(cconn, tdata, sw_tag, tdata->dlen);
1469 if (!err)
1470 tag = ttinfo->tag;
1471 else
1472 log_debug(1 << CXGBI_DBG_DDP,
1473 "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1474 cconn->cep->csk, task, tdata->dlen,
1475 ttinfo->nents);
1476 }
1477
1478 if (err < 0) {
1479 err = cxgbi_ppm_make_non_ddp_tag(ppm, sw_tag, &tag);
1480 if (err < 0)
1481 return err;
1482 }
1483 /* the itt need to sent in big-endian order */
1484 *hdr_itt = (__force itt_t)htonl(tag);
1485
1486 log_debug(1 << CXGBI_DBG_DDP,
1487 "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1488 cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
9ba682f0 1489 return 0;
1490}
1491
1492void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1493{
71f7a00b
VP		 1494 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1495 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1496 struct cxgbi_device *cdev = cconn->chba->cdev;
1497 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1498 u32 tag = ntohl((__force u32)itt);
1499 u32 sw_bits;
1500
1501 if (ppm) {
1502 if (cxgbi_ppm_is_ddp_tag(ppm, tag))
1503 sw_bits = cxgbi_ppm_get_tag_caller_data(ppm, tag);
1504 else
1505 sw_bits = cxgbi_ppm_decode_non_ddp_tag(ppm, tag);
1506 } else {
1507 sw_bits = tag;
1508 }
1509
1510 cxgbi_decode_sw_tag(sw_bits, idx, age);
1511 log_debug(1 << CXGBI_DBG_DDP,
1512 "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1513 cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1514 age ? *age : 0xFF);
9ba682f0 1515}
1516EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1517
1518void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1519{
1520 struct iscsi_conn *conn = csk->user_data;
1521
1522 if (conn) {
1523 log_debug(1 << CXGBI_DBG_SOCK,
1524 "csk 0x%p, cid %d.\n", csk, conn->id);
1525 iscsi_conn_queue_work(conn);
1526 }
1527}
1528EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1529
1530/*
1531 * pdu receive, interact with libiscsi_tcp
1532 */
1533static inline int read_pdu_skb(struct iscsi_conn *conn,
1534 struct sk_buff *skb,
1535 unsigned int offset,
1536 int offloaded)
1537{
1538 int status = 0;
1539 int bytes_read;
1540
1541 bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1542 switch (status) {
1543 case ISCSI_TCP_CONN_ERR:
1544 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1545 skb, offset, offloaded);
1546 return -EIO;
1547 case ISCSI_TCP_SUSPENDED:
1548 log_debug(1 << CXGBI_DBG_PDU_RX,
1549 "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1550 skb, offset, offloaded, bytes_read);
1551 /* no transfer - just have caller flush queue */
1552 return bytes_read;
1553 case ISCSI_TCP_SKB_DONE:
1554 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1555 skb, offset, offloaded);
1556 /*
1557 * pdus should always fit in the skb and we should get
1558 * segment done notifcation.
1559 */
1560 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1561 return -EFAULT;
1562 case ISCSI_TCP_SEGMENT_DONE:
1563 log_debug(1 << CXGBI_DBG_PDU_RX,
1564 "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1565 skb, offset, offloaded, bytes_read);
1566 return bytes_read;
1567 default:
1568 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1569 skb, offset, offloaded, status);
1570 return -EINVAL;
1571 }
1572}
1573
e0f8e8cf
VP		 1574static int
1575skb_read_pdu_bhs(struct cxgbi_sock *csk, struct iscsi_conn *conn,
1576 struct sk_buff *skb)
9ba682f0 1577{
1578 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
e0f8e8cf 1579 int err;
9ba682f0 1580
1581 log_debug(1 << CXGBI_DBG_PDU_RX,
1582 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1583 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1584
1585 if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1586 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1587 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1588 return -EIO;
1589 }
1590
1591 if (conn->hdrdgst_en &&
1592 cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1593 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1594 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1595 return -EIO;
1596 }
1597
44830d8f
VP		 1598 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_ISCSI_COMPL) &&
1599 cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA_DDPD)) {
1600 /* If completion flag is set and data is directly
1601 * placed in to the host memory then update
1602 * task->exp_datasn to the datasn in completion
1603 * iSCSI hdr as T6 adapter generates completion only
1604 * for the last pdu of a sequence.
1605 */
1606 itt_t itt = ((struct iscsi_data *)skb->data)->itt;
1607 struct iscsi_task *task = iscsi_itt_to_ctask(conn, itt);
1608 u32 data_sn = be32_to_cpu(((struct iscsi_data *)
1609 skb->data)->datasn);
1610 if (task && task->sc) {
1611 struct iscsi_tcp_task *tcp_task = task->dd_data;
1612
1613 tcp_task->exp_datasn = data_sn;
1614 }
1615 }
1616
e0f8e8cf
VP		 1617 err = read_pdu_skb(conn, skb, 0, 0);
1618 if (likely(err >= 0)) {
1619 struct iscsi_hdr *hdr = (struct iscsi_hdr *)skb->data;
1620 u8 opcode = hdr->opcode & ISCSI_OPCODE_MASK;
1621
1622 if (unlikely(opcode == ISCSI_OP_LOGOUT_RSP))
1623 cxgbi_sock_set_flag(csk, CTPF_LOGOUT_RSP_RCVD);
1624 }
1625
1626 return err;
9ba682f0 1627}
1628
1629static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1630 struct sk_buff *skb, unsigned int offset)
1631{
1632 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1633 bool offloaded = 0;
1634 int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1635
1636 log_debug(1 << CXGBI_DBG_PDU_RX,
1637 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1638 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1639
1640 if (conn->datadgst_en &&
1641 cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1642 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1643 conn, lskb, cxgbi_skcb_flags(lskb));
1644 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1645 return -EIO;
1646 }
1647
1648 if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1649 return 0;
1650
1651 /* coalesced, add header digest length */
1652 if (lskb == skb && conn->hdrdgst_en)
1653 offset += ISCSI_DIGEST_SIZE;
1654
1655 if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1656 offloaded = 1;
1657
1658 if (opcode == ISCSI_OP_SCSI_DATA_IN)
1659 log_debug(1 << CXGBI_DBG_PDU_RX,
1660 "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1661 skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1662 tcp_conn->in.datalen, offloaded ? "is" : "not");
1663
1664 return read_pdu_skb(conn, skb, offset, offloaded);
1665}
1666
1667static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1668{
1669 struct cxgbi_device *cdev = csk->cdev;
1670 int must_send;
1671 u32 credits;
1672
1673 log_debug(1 << CXGBI_DBG_PDU_RX,
fc385045 1674 "csk 0x%p,%u,0x%lx,%u, seq %u, wup %u, thre %u, %u.\n",
9ba682f0 1675 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1676 csk->rcv_wup, cdev->rx_credit_thres,
81daf10c 1677 csk->rcv_win);
9ba682f0 1678
586be7cb
VP		 1679 if (!cdev->rx_credit_thres)
1680 return;
1681
9ba682f0 1682 if (csk->state != CTP_ESTABLISHED)
1683 return;
1684
1685 credits = csk->copied_seq - csk->rcv_wup;
1686 if (unlikely(!credits))
1687 return;
81daf10c 1688 must_send = credits + 16384 >= csk->rcv_win;
9ba682f0 1689 if (must_send || credits >= cdev->rx_credit_thres)
1690 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1691}
1692
1693void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1694{
1695 struct cxgbi_device *cdev = csk->cdev;
1696 struct iscsi_conn *conn = csk->user_data;
1697 struct sk_buff *skb;
1698 unsigned int read = 0;
1699 int err = 0;
1700
1701 log_debug(1 << CXGBI_DBG_PDU_RX,
1702 "csk 0x%p, conn 0x%p.\n", csk, conn);
1703
1704 if (unlikely(!conn || conn->suspend_rx)) {
1705 log_debug(1 << CXGBI_DBG_PDU_RX,
1706 "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1707 csk, conn, conn ? conn->id : 0xFF,
1708 conn ? conn->suspend_rx : 0xFF);
9ba682f0 1709 return;
1710 }
1711
1712 while (!err) {
9ba682f0 1713 skb = skb_peek(&csk->receive_queue);
1714 if (!skb ||
1715 !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1716 if (skb)
1717 log_debug(1 << CXGBI_DBG_PDU_RX,
1718 "skb 0x%p, NOT ready 0x%lx.\n",
1719 skb, cxgbi_skcb_flags(skb));
9ba682f0 1720 break;
1721 }
1722 __skb_unlink(skb, &csk->receive_queue);
9ba682f0 1723
1724 read += cxgbi_skcb_rx_pdulen(skb);
1725 log_debug(1 << CXGBI_DBG_PDU_RX,
1726 "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1727 csk, skb, skb->len, cxgbi_skcb_flags(skb),
1728 cxgbi_skcb_rx_pdulen(skb));
1729
1730 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
e0f8e8cf 1731 err = skb_read_pdu_bhs(csk, conn, skb);
e3d2ad8c 1732 if (err < 0) {
1733 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1734 "f 0x%lx, plen %u.\n",
1735 csk, skb, skb->len,
1736 cxgbi_skcb_flags(skb),
1737 cxgbi_skcb_rx_pdulen(skb));
1738 goto skb_done;
1739 }
9ba682f0 1740 err = skb_read_pdu_data(conn, skb, skb,
1741 err + cdev->skb_rx_extra);
e3d2ad8c 1742 if (err < 0)
1743 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1744 "f 0x%lx, plen %u.\n",
1745 csk, skb, skb->len,
1746 cxgbi_skcb_flags(skb),
1747 cxgbi_skcb_rx_pdulen(skb));
9ba682f0 1748 } else {
e0f8e8cf 1749 err = skb_read_pdu_bhs(csk, conn, skb);
e3d2ad8c 1750 if (err < 0) {
1751 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1752 "f 0x%lx, plen %u.\n",
1753 csk, skb, skb->len,
1754 cxgbi_skcb_flags(skb),
1755 cxgbi_skcb_rx_pdulen(skb));
1756 goto skb_done;
1757 }
1758
9ba682f0 1759 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1760 struct sk_buff *dskb;
1761
9ba682f0 1762 dskb = skb_peek(&csk->receive_queue);
1763 if (!dskb) {
e3d2ad8c 1764 pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1765 " plen %u, NO data.\n",
1766 csk, skb, skb->len,
1767 cxgbi_skcb_flags(skb),
1768 cxgbi_skcb_rx_pdulen(skb));
1769 err = -EIO;
1770 goto skb_done;
9ba682f0 1771 }
1772 __skb_unlink(dskb, &csk->receive_queue);
9ba682f0 1773
1774 err = skb_read_pdu_data(conn, skb, dskb, 0);
e3d2ad8c 1775 if (err < 0)
1776 pr_err("data, csk 0x%p, skb 0x%p,%u, "
1777 "f 0x%lx, plen %u, dskb 0x%p,"
1778 "%u.\n",
1779 csk, skb, skb->len,
1780 cxgbi_skcb_flags(skb),
1781 cxgbi_skcb_rx_pdulen(skb),
1782 dskb, dskb->len);
9ba682f0 1783 __kfree_skb(dskb);
1784 } else
1785 err = skb_read_pdu_data(conn, skb, skb, 0);
1786 }
e3d2ad8c 1787skb_done:
1788 __kfree_skb(skb);
1789
9ba682f0 1790 if (err < 0)
1791 break;
9ba682f0 1792 }
1793
1794 log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
1795 if (read) {
1796 csk->copied_seq += read;
1797 csk_return_rx_credits(csk, read);
1798 conn->rxdata_octets += read;
1799 }
1800
1801 if (err < 0) {
e3d2ad8c 1802 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
1803 csk, conn, err, read);
9ba682f0 1804 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1805 }
1806}
1807EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
1808
1809static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
1810 unsigned int offset, unsigned int *off,
1811 struct scatterlist **sgp)
1812{
1813 int i;
1814 struct scatterlist *sg;
1815
1816 for_each_sg(sgl, sg, sgcnt, i) {
1817 if (offset < sg->length) {
1818 *off = offset;
1819 *sgp = sg;
1820 return 0;
1821 }
1822 offset -= sg->length;
1823 }
1824 return -EFAULT;
1825}
1826
1827static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
6a39a16a 1828 unsigned int dlen, struct page_frag *frags,
9ba682f0 1829 int frag_max)
1830{
1831 unsigned int datalen = dlen;
1832 unsigned int sglen = sg->length - sgoffset;
1833 struct page *page = sg_page(sg);
1834 int i;
1835
1836 i = 0;
1837 do {
1838 unsigned int copy;
1839
1840 if (!sglen) {
1841 sg = sg_next(sg);
1842 if (!sg) {
1843 pr_warn("sg %d NULL, len %u/%u.\n",
1844 i, datalen, dlen);
1845 return -EINVAL;
1846 }
1847 sgoffset = 0;
1848 sglen = sg->length;
1849 page = sg_page(sg);
1850
1851 }
1852 copy = min(datalen, sglen);
1853 if (i && page == frags[i - 1].page &&
1854 sgoffset + sg->offset ==
6a39a16a
IC		 1855 frags[i - 1].offset + frags[i - 1].size) {
1856 frags[i - 1].size += copy;
9ba682f0 1857 } else {
1858 if (i >= frag_max) {
1859 pr_warn("too many pages %u, dlen %u.\n",
1860 frag_max, dlen);
1861 return -EINVAL;
1862 }
1863
1864 frags[i].page = page;
6a39a16a
IC		 1865 frags[i].offset = sg->offset + sgoffset;
1866 frags[i].size = copy;
9ba682f0 1867 i++;
1868 }
1869 datalen -= copy;
1870 sgoffset += copy;
1871 sglen -= copy;
1872 } while (datalen);
1873
1874 return i;
1875}
1876
1877int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
1878{
1879 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1880 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1881 struct cxgbi_device *cdev = cconn->chba->cdev;
1882 struct iscsi_conn *conn = task->conn;
1883 struct iscsi_tcp_task *tcp_task = task->dd_data;
e3d2ad8c 1884 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
9ba682f0 1885 struct scsi_cmnd *sc = task->sc;
22698483
VP		 1886 struct cxgbi_sock *csk = cconn->cep->csk;
1887 struct net_device *ndev = cdev->ports[csk->port_id];
9ba682f0 1888 int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
1889
1890 tcp_task->dd_data = tdata;
1891 task->hdr = NULL;
1892
1893 if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
1894 (opcode == ISCSI_OP_SCSI_DATA_OUT ||
1895 (opcode == ISCSI_OP_SCSI_CMD &&
ae3d56d8 1896 sc->sc_data_direction == DMA_TO_DEVICE)))
9ba682f0 1897 /* data could goes into skb head */
1898 headroom += min_t(unsigned int,
1899 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
1900 conn->max_xmit_dlength);
1901
1902 tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
1903 if (!tdata->skb) {
00c4a09b 1904 ndev->stats.tx_dropped++;
9ba682f0 1905 return -ENOMEM;
1906 }
1907
1908 skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
22698483
VP		 1909
1910 if (task->sc) {
1911 task->hdr = (struct iscsi_hdr *)tdata->skb->data;
1912 } else {
dd04b0f3 1913 task->hdr = kzalloc(SKB_TX_ISCSI_PDU_HEADER_MAX, GFP_ATOMIC);
22698483
VP		 1914 if (!task->hdr) {
1915 __kfree_skb(tdata->skb);
1916 tdata->skb = NULL;
1917 ndev->stats.tx_dropped++;
1918 return -ENOMEM;
1919 }
1920 }
9ba682f0 1921 task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
1922
1923 /* data_out uses scsi_cmd's itt */
1924 if (opcode != ISCSI_OP_SCSI_DATA_OUT)
1925 task_reserve_itt(task, &task->hdr->itt);
1926
1927 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1928 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
1929 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
1930 conn->max_xmit_dlength, ntohl(task->hdr->itt));
1931
1932 return 0;
1933}
1934EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
1935
1936static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
1937{
c343a01c 1938 if (hcrc || dcrc) {
1939 u8 submode = 0;
9ba682f0 1940
c343a01c 1941 if (hcrc)
1942 submode |= 1;
1943 if (dcrc)
1944 submode |= 2;
1945 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
1946 } else
1947 cxgbi_skcb_ulp_mode(skb) = 0;
9ba682f0 1948}
1949
1950int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
1951 unsigned int count)
1952{
1953 struct iscsi_conn *conn = task->conn;
e3d2ad8c 1954 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
9ba682f0 1955 struct sk_buff *skb = tdata->skb;
1956 unsigned int datalen = count;
1957 int i, padlen = iscsi_padding(count);
1958 struct page *pg;
1959
1960 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1961 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
1962 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
1963 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
1964
1965 skb_put(skb, task->hdr_len);
1966 tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
1967 if (!count)
1968 return 0;
1969
1970 if (task->sc) {
ae3d56d8 1971 struct scsi_data_buffer *sdb = &task->sc->sdb;
9ba682f0 1972 struct scatterlist *sg = NULL;
1973 int err;
1974
1975 tdata->offset = offset;
1976 tdata->count = count;
1977 err = sgl_seek_offset(
1978 sdb->table.sgl, sdb->table.nents,
1979 tdata->offset, &tdata->sgoffset, &sg);
1980 if (err < 0) {
1981 pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
1982 sdb->table.nents, tdata->offset, sdb->length);
1983 return err;
1984 }
1985 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
1986 tdata->frags, MAX_PDU_FRAGS);
1987 if (err < 0) {
1988 pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
1989 sdb->table.nents, tdata->offset, tdata->count);
1990 return err;
1991 }
1992 tdata->nr_frags = err;
1993
1994 if (tdata->nr_frags > MAX_SKB_FRAGS ||
1995 (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
1996 char *dst = skb->data + task->hdr_len;
6a39a16a 1997 struct page_frag *frag = tdata->frags;
9ba682f0 1998
1999 /* data fits in the skb's headroom */
2000 for (i = 0; i < tdata->nr_frags; i++, frag++) {
77dfce07 2001 char *src = kmap_atomic(frag->page);
9ba682f0 2002
6a39a16a
IC		 2003 memcpy(dst, src+frag->offset, frag->size);
2004 dst += frag->size;
77dfce07 2005 kunmap_atomic(src);
9ba682f0 2006 }
2007 if (padlen) {
2008 memset(dst, 0, padlen);
2009 padlen = 0;
2010 }
2011 skb_put(skb, count + padlen);
2012 } else {
2013 /* data fit into frag_list */
6a39a16a
IC		 2014 for (i = 0; i < tdata->nr_frags; i++) {
2015 __skb_fill_page_desc(skb, i,
2016 tdata->frags[i].page,
2017 tdata->frags[i].offset,
2018 tdata->frags[i].size);
2019 skb_frag_ref(skb, i);
2020 }
9ba682f0 2021 skb_shinfo(skb)->nr_frags = tdata->nr_frags;
2022 skb->len += count;
2023 skb->data_len += count;
2024 skb->truesize += count;
2025 }
2026
2027 } else {
2028 pg = virt_to_page(task->data);
2029
2030 get_page(pg);
2031 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
2032 count);
2033 skb->len += count;
2034 skb->data_len += count;
2035 skb->truesize += count;
2036 }
2037
2038 if (padlen) {
2039 i = skb_shinfo(skb)->nr_frags;
2040 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
2041 virt_to_page(padding), offset_in_page(padding),
2042 padlen);
2043
2044 skb->data_len += padlen;
2045 skb->truesize += padlen;
2046 skb->len += padlen;
2047 }
2048
2049 return 0;
2050}
2051EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
2052
2053int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2054{
2055 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2056 struct cxgbi_conn *cconn = tcp_conn->dd_data;
e3d2ad8c 2057 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
71f7a00b 2058 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
9ba682f0 2059 struct sk_buff *skb = tdata->skb;
71f7a00b 2060 struct cxgbi_sock *csk = NULL;
9ba682f0 2061 unsigned int datalen;
2062 int err;
2063
22698483 2064 if (!skb) {
9ba682f0 2065 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
22698483 2066 "task 0x%p\n", task);
9ba682f0 2067 return 0;
2068 }
2069
71f7a00b
VP		 2070 if (cconn && cconn->cep)
2071 csk = cconn->cep->csk;
2072 if (!csk) {
2073 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2074 "task 0x%p, csk gone.\n", task);
2075 return -EPIPE;
2076 }
2077
22698483 2078 tdata->skb = NULL;
9ba682f0 2079 datalen = skb->data_len;
71f7a00b
VP		 2080
2081 /* write ppod first if using ofldq to write ppod */
2082 if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_VALID) {
2083 struct cxgbi_ppm *ppm = csk->cdev->cdev2ppm(csk->cdev);
2084
2085 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_VALID;
2086 if (csk->cdev->csk_ddp_set_map(ppm, csk, ttinfo) < 0)
2087 pr_err("task 0x%p, ppod writing using ofldq failed.\n",
2088 task);
2089 /* continue. Let fl get the data */
2090 }
2091
22698483
VP		 2092 if (!task->sc)
2093 memcpy(skb->data, task->hdr, SKB_TX_ISCSI_PDU_HEADER_MAX);
2094
9ba682f0 2095 err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2096 if (err > 0) {
2097 int pdulen = err;
2098
2099 log_debug(1 << CXGBI_DBG_PDU_TX,
2100 "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2101 task, task->sc, skb, skb->len, skb->data_len, err);
2102
2103 if (task->conn->hdrdgst_en)
2104 pdulen += ISCSI_DIGEST_SIZE;
2105
2106 if (datalen && task->conn->datadgst_en)
2107 pdulen += ISCSI_DIGEST_SIZE;
2108
2109 task->conn->txdata_octets += pdulen;
2110 return 0;
2111 }
2112
2113 if (err == -EAGAIN || err == -ENOBUFS) {
2114 log_debug(1 << CXGBI_DBG_PDU_TX,
2115 "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2116 task, skb, skb->len, skb->data_len, err);
2117 /* reset skb to send when we are called again */
22698483 2118 tdata->skb = skb;
9ba682f0 2119 return err;
2120 }
2121
9ba682f0 2122 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2123 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2124 task->itt, skb, skb->len, skb->data_len, err);
ed481a33 2125
22698483 2126 __kfree_skb(skb);
ed481a33 2127
9ba682f0 2128 iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2129 iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2130 return err;
2131}
2132EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2133
2134void cxgbi_cleanup_task(struct iscsi_task *task)
2135{
71f7a00b 2136 struct iscsi_tcp_task *tcp_task = task->dd_data;
e3d2ad8c 2137 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
9ba682f0 2138
50292710
VP		 2139 if (!tcp_task || !tdata || (tcp_task->dd_data != tdata)) {
2140 pr_info("task 0x%p,0x%p, tcp_task 0x%p, tdata 0x%p/0x%p.\n",
2141 task, task->sc, tcp_task,
2142 tcp_task ? tcp_task->dd_data : NULL, tdata);
2143 return;
2144 }
2145
9ba682f0 2146 log_debug(1 << CXGBI_DBG_ISCSI,
2147 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2148 task, tdata->skb, task->hdr_itt);
2149
71f7a00b 2150 tcp_task->dd_data = NULL;
22698483
VP		 2151
2152 if (!task->sc)
2153 kfree(task->hdr);
2154 task->hdr = NULL;
2155
9ba682f0 2156 /* never reached the xmit task callout */
75b61250 2157 if (tdata->skb) {
22698483 2158 __kfree_skb(tdata->skb);
75b61250
VP		 2159 tdata->skb = NULL;
2160 }
9ba682f0 2161
2162 task_release_itt(task, task->hdr_itt);
69e2d1e6
VP		 2163 memset(tdata, 0, sizeof(*tdata));
2164
9ba682f0 2165 iscsi_tcp_cleanup_task(task);
2166}
2167EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2168
2169void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2170 struct iscsi_stats *stats)
2171{
2172 struct iscsi_conn *conn = cls_conn->dd_data;
2173
2174 stats->txdata_octets = conn->txdata_octets;
2175 stats->rxdata_octets = conn->rxdata_octets;
2176 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2177 stats->dataout_pdus = conn->dataout_pdus_cnt;
2178 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2179 stats->datain_pdus = conn->datain_pdus_cnt;
2180 stats->r2t_pdus = conn->r2t_pdus_cnt;
2181 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2182 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2183 stats->digest_err = 0;
2184 stats->timeout_err = 0;
2185 stats->custom_length = 1;
2186 strcpy(stats->custom[0].desc, "eh_abort_cnt");
2187 stats->custom[0].value = conn->eh_abort_cnt;
2188}
2189EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2190
2191static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2192{
2193 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2194 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2195 struct cxgbi_device *cdev = cconn->chba->cdev;
2196 unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2197 unsigned int max_def = 512 * MAX_SKB_FRAGS;
2198 unsigned int max = max(max_def, headroom);
2199
2200 max = min(cconn->chba->cdev->tx_max_size, max);
2201 if (conn->max_xmit_dlength)
2202 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2203 else
2204 conn->max_xmit_dlength = max;
2205 cxgbi_align_pdu_size(conn->max_xmit_dlength);
2206
2207 return 0;
2208}
2209
2210static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2211{
2212 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2213 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2214 unsigned int max = cconn->chba->cdev->rx_max_size;
2215
2216 cxgbi_align_pdu_size(max);
2217
2218 if (conn->max_recv_dlength) {
2219 if (conn->max_recv_dlength > max) {
2220 pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2221 conn->max_recv_dlength, max);
2222 return -EINVAL;
2223 }
2224 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2225 cxgbi_align_pdu_size(conn->max_recv_dlength);
2226 } else
2227 conn->max_recv_dlength = max;
2228
2229 return 0;
2230}
2231
2232int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2233 enum iscsi_param param, char *buf, int buflen)
2234{
2235 struct iscsi_conn *conn = cls_conn->dd_data;
9ba682f0 2236 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2237 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2238 struct cxgbi_sock *csk = cconn->cep->csk;
1304be5f 2239 int err;
9ba682f0 2240
2241 log_debug(1 << CXGBI_DBG_ISCSI,
2242 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2243 cls_conn, param, buflen, buf);
2244
2245 switch (param) {
2246 case ISCSI_PARAM_HDRDGST_EN:
2247 err = iscsi_set_param(cls_conn, param, buf, buflen);
2248 if (!err && conn->hdrdgst_en)
2249 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2250 conn->hdrdgst_en,
2251 conn->datadgst_en, 0);
2252 break;
2253 case ISCSI_PARAM_DATADGST_EN:
2254 err = iscsi_set_param(cls_conn, param, buf, buflen);
2255 if (!err && conn->datadgst_en)
2256 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2257 conn->hdrdgst_en,
2258 conn->datadgst_en, 0);
2259 break;
2260 case ISCSI_PARAM_MAX_R2T:
1304be5f 2261 return iscsi_tcp_set_max_r2t(conn, buf);
9ba682f0 2262 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2263 err = iscsi_set_param(cls_conn, param, buf, buflen);
2264 if (!err)
2265 err = cxgbi_conn_max_recv_dlength(conn);
2266 break;
2267 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2268 err = iscsi_set_param(cls_conn, param, buf, buflen);
2269 if (!err)
2270 err = cxgbi_conn_max_xmit_dlength(conn);
2271 break;
2272 default:
2273 return iscsi_set_param(cls_conn, param, buf, buflen);
2274 }
2275 return err;
2276}
2277EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2278
fc8d0590
AB		 2279static inline int csk_print_port(struct cxgbi_sock *csk, char *buf)
2280{
2281 int len;
2282
2283 cxgbi_sock_get(csk);
2284 len = sprintf(buf, "%hu\n", ntohs(csk->daddr.sin_port));
2285 cxgbi_sock_put(csk);
2286
2287 return len;
2288}
2289
2290static inline int csk_print_ip(struct cxgbi_sock *csk, char *buf)
2291{
2292 int len;
2293
2294 cxgbi_sock_get(csk);
2295 if (csk->csk_family == AF_INET)
2296 len = sprintf(buf, "%pI4",
2297 &csk->daddr.sin_addr.s_addr);
2298 else
2299 len = sprintf(buf, "%pI6",
2300 &csk->daddr6.sin6_addr);
2301
2302 cxgbi_sock_put(csk);
2303
2304 return len;
2305}
2306
c71b9b66
MC		 2307int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2308 char *buf)
9ba682f0 2309{
c71b9b66
MC		 2310 struct cxgbi_endpoint *cep = ep->dd_data;
2311 struct cxgbi_sock *csk;
9ba682f0 2312 int len;
2313
2314 log_debug(1 << CXGBI_DBG_ISCSI,
c71b9b66 2315 "cls_conn 0x%p, param %d.\n", ep, param);
9ba682f0 2316
2317 switch (param) {
2318 case ISCSI_PARAM_CONN_PORT:
9ba682f0 2319 case ISCSI_PARAM_CONN_ADDRESS:
c71b9b66
MC		 2320 if (!cep)
2321 return -ENOTCONN;
2322
2323 csk = cep->csk;
2324 if (!csk)
2325 return -ENOTCONN;
2326
2327 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2328 &csk->daddr, param, buf);
9ba682f0 2329 default:
c71b9b66 2330 return -ENOSYS;
9ba682f0 2331 }
2332 return len;
2333}
c71b9b66 2334EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
9ba682f0 2335
2336struct iscsi_cls_conn *
2337cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2338{
2339 struct iscsi_cls_conn *cls_conn;
2340 struct iscsi_conn *conn;
2341 struct iscsi_tcp_conn *tcp_conn;
2342 struct cxgbi_conn *cconn;
2343
2344 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2345 if (!cls_conn)
2346 return NULL;
2347
2348 conn = cls_conn->dd_data;
2349 tcp_conn = conn->dd_data;
2350 cconn = tcp_conn->dd_data;
2351 cconn->iconn = conn;
2352
2353 log_debug(1 << CXGBI_DBG_ISCSI,
2354 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2355 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2356
2357 return cls_conn;
2358}
2359EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2360
2361int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2362 struct iscsi_cls_conn *cls_conn,
2363 u64 transport_eph, int is_leading)
2364{
2365 struct iscsi_conn *conn = cls_conn->dd_data;
2366 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2367 struct cxgbi_conn *cconn = tcp_conn->dd_data;
71f7a00b 2368 struct cxgbi_ppm *ppm;
9ba682f0 2369 struct iscsi_endpoint *ep;
2370 struct cxgbi_endpoint *cep;
2371 struct cxgbi_sock *csk;
2372 int err;
2373
2374 ep = iscsi_lookup_endpoint(transport_eph);
2375 if (!ep)
2376 return -EINVAL;
2377
2378 /* setup ddp pagesize */
2379 cep = ep->dd_data;
2380 csk = cep->csk;
9ba682f0 2381
71f7a00b
VP		 2382 ppm = csk->cdev->cdev2ppm(csk->cdev);
2383 err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid,
2384 ppm->tformat.pgsz_idx_dflt, 0);
2385 if (err < 0)
2386 return err;
2387
9ba682f0 2388 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2389 if (err)
2390 return -EINVAL;
2391
2392 /* calculate the tag idx bits needed for this conn based on cmds_max */
2393 cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2394
e3d2ad8c 2395 write_lock_bh(&csk->callback_lock);
9ba682f0 2396 csk->user_data = conn;
2397 cconn->chba = cep->chba;
2398 cconn->cep = cep;
2399 cep->cconn = cconn;
e3d2ad8c 2400 write_unlock_bh(&csk->callback_lock);
9ba682f0 2401
2402 cxgbi_conn_max_xmit_dlength(conn);
2403 cxgbi_conn_max_recv_dlength(conn);
2404
9ba682f0 2405 log_debug(1 << CXGBI_DBG_ISCSI,
2406 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2407 cls_session, cls_conn, ep, cconn, csk);
2408 /* init recv engine */
2409 iscsi_tcp_hdr_recv_prep(tcp_conn);
2410
2411 return 0;
2412}
2413EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2414
2415struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2416 u16 cmds_max, u16 qdepth,
2417 u32 initial_cmdsn)
2418{
2419 struct cxgbi_endpoint *cep;
2420 struct cxgbi_hba *chba;
2421 struct Scsi_Host *shost;
2422 struct iscsi_cls_session *cls_session;
2423 struct iscsi_session *session;
2424
2425 if (!ep) {
2426 pr_err("missing endpoint.\n");
2427 return NULL;
2428 }
2429
2430 cep = ep->dd_data;
2431 chba = cep->chba;
2432 shost = chba->shost;
2433
2434 BUG_ON(chba != iscsi_host_priv(shost));
2435
2436 cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2437 cmds_max, 0,
2438 sizeof(struct iscsi_tcp_task) +
2439 sizeof(struct cxgbi_task_data),
2440 initial_cmdsn, ISCSI_MAX_TARGET);
2441 if (!cls_session)
2442 return NULL;
2443
2444 session = cls_session->dd_data;
2445 if (iscsi_tcp_r2tpool_alloc(session))
2446 goto remove_session;
2447
2448 log_debug(1 << CXGBI_DBG_ISCSI,
2449 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2450 return cls_session;
2451
2452remove_session:
2453 iscsi_session_teardown(cls_session);
2454 return NULL;
2455}
2456EXPORT_SYMBOL_GPL(cxgbi_create_session);
2457
2458void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2459{
2460 log_debug(1 << CXGBI_DBG_ISCSI,
2461 "cls sess 0x%p.\n", cls_session);
2462
2463 iscsi_tcp_r2tpool_free(cls_session->dd_data);
2464 iscsi_session_teardown(cls_session);
2465}
2466EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2467
2468int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2469 char *buf, int buflen)
2470{
2471 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2472
2473 if (!chba->ndev) {
2474 shost_printk(KERN_ERR, shost, "Could not get host param. "
2475 "netdev for host not set.\n");
2476 return -ENODEV;
2477 }
2478
2479 log_debug(1 << CXGBI_DBG_ISCSI,
2480 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2481 shost, chba, chba->ndev->name, param, buflen, buf);
2482
2483 switch (param) {
2484 case ISCSI_HOST_PARAM_IPADDRESS:
2485 {
2486 __be32 addr = in_aton(buf);
2487 log_debug(1 << CXGBI_DBG_ISCSI,
2488 "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2489 cxgbi_set_iscsi_ipv4(chba, addr);
2490 return 0;
2491 }
2492 case ISCSI_HOST_PARAM_HWADDRESS:
2493 case ISCSI_HOST_PARAM_NETDEV_NAME:
2494 return 0;
2495 default:
2496 return iscsi_host_set_param(shost, param, buf, buflen);
2497 }
2498}
2499EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2500
2501int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2502 char *buf)
2503{
2504 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2505 int len = 0;
2506
2507 if (!chba->ndev) {
2508 shost_printk(KERN_ERR, shost, "Could not get host param. "
2509 "netdev for host not set.\n");
2510 return -ENODEV;
2511 }
2512
2513 log_debug(1 << CXGBI_DBG_ISCSI,
2514 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2515 shost, chba, chba->ndev->name, param);
2516
2517 switch (param) {
2518 case ISCSI_HOST_PARAM_HWADDRESS:
2519 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2520 break;
2521 case ISCSI_HOST_PARAM_NETDEV_NAME:
2522 len = sprintf(buf, "%s\n", chba->ndev->name);
2523 break;
2524 case ISCSI_HOST_PARAM_IPADDRESS:
2525 {
dd9ad67e
AB		 2526 struct cxgbi_sock *csk = find_sock_on_port(chba->cdev,
2527 chba->port_id);
2528 if (csk) {
2529 len = sprintf(buf, "%pIS",
2530 (struct sockaddr *)&csk->saddr);
2531 }
9ba682f0 2532 log_debug(1 << CXGBI_DBG_ISCSI,
dd9ad67e 2533 "hba %s, addr %s.\n", chba->ndev->name, buf);
9ba682f0 2534 break;
2535 }
2536 default:
2537 return iscsi_host_get_param(shost, param, buf);
2538 }
2539
2540 return len;
2541}
2542EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2543
2544struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2545 struct sockaddr *dst_addr,
2546 int non_blocking)
2547{
2548 struct iscsi_endpoint *ep;
2549 struct cxgbi_endpoint *cep;
2550 struct cxgbi_hba *hba = NULL;
2551 struct cxgbi_sock *csk;
4737c5a0 2552 int ifindex = 0;
9ba682f0 2553 int err = -EINVAL;
2554
2555 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2556 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2557 shost, non_blocking, dst_addr);
2558
2559 if (shost) {
2560 hba = iscsi_host_priv(shost);
2561 if (!hba) {
2562 pr_info("shost 0x%p, priv NULL.\n", shost);
2563 goto err_out;
2564 }
4737c5a0 2565
4c2a0215
VP		 2566 rtnl_lock();
2567 if (!vlan_uses_dev(hba->ndev))
2568 ifindex = hba->ndev->ifindex;
2569 rtnl_unlock();
9ba682f0 2570 }
2571
fc8d0590 2572 if (dst_addr->sa_family == AF_INET) {
4737c5a0 2573 csk = cxgbi_check_route(dst_addr, ifindex);
e81fbf6c 2574#if IS_ENABLED(CONFIG_IPV6)
fc8d0590 2575 } else if (dst_addr->sa_family == AF_INET6) {
4737c5a0 2576 csk = cxgbi_check_route6(dst_addr, ifindex);
e81fbf6c 2577#endif
fc8d0590
AB		 2578 } else {
2579 pr_info("address family 0x%x NOT supported.\n",
2580 dst_addr->sa_family);
2581 err = -EAFNOSUPPORT;
2582 return (struct iscsi_endpoint *)ERR_PTR(err);
2583 }
2584
9ba682f0 2585 if (IS_ERR(csk))
2586 return (struct iscsi_endpoint *)csk;
2587 cxgbi_sock_get(csk);
2588
2589 if (!hba)
2590 hba = csk->cdev->hbas[csk->port_id];
2591 else if (hba != csk->cdev->hbas[csk->port_id]) {
2592 pr_info("Could not connect through requested host %u"
2593 "hba 0x%p != 0x%p (%u).\n",
2594 shost->host_no, hba,
2595 csk->cdev->hbas[csk->port_id], csk->port_id);
2596 err = -ENOSPC;
2597 goto release_conn;
2598 }
2599
2600 err = sock_get_port(csk);
2601 if (err)
2602 goto release_conn;
2603
2604 cxgbi_sock_set_state(csk, CTP_CONNECTING);
2605 err = csk->cdev->csk_init_act_open(csk);
2606 if (err)
2607 goto release_conn;
2608
2609 if (cxgbi_sock_is_closing(csk)) {
2610 err = -ENOSPC;
2611 pr_info("csk 0x%p is closing.\n", csk);
2612 goto release_conn;
2613 }
2614
2615 ep = iscsi_create_endpoint(sizeof(*cep));
2616 if (!ep) {
2617 err = -ENOMEM;
2618 pr_info("iscsi alloc ep, OOM.\n");
2619 goto release_conn;
2620 }
2621
2622 cep = ep->dd_data;
2623 cep->csk = csk;
2624 cep->chba = hba;
2625
2626 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2627 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2628 ep, cep, csk, hba, hba->ndev->name);
2629 return ep;
2630
2631release_conn:
2632 cxgbi_sock_put(csk);
2633 cxgbi_sock_closed(csk);
2634err_out:
2635 return ERR_PTR(err);
2636}
2637EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2638
2639int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2640{
2641 struct cxgbi_endpoint *cep = ep->dd_data;
2642 struct cxgbi_sock *csk = cep->csk;
2643
2644 if (!cxgbi_sock_is_established(csk))
2645 return 0;
2646 return 1;
2647}
2648EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2649
2650void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2651{
2652 struct cxgbi_endpoint *cep = ep->dd_data;
2653 struct cxgbi_conn *cconn = cep->cconn;
2654 struct cxgbi_sock *csk = cep->csk;
2655
2656 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2657 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2658 ep, cep, cconn, csk, csk->state, csk->flags);
2659
2660 if (cconn && cconn->iconn) {
2661 iscsi_suspend_tx(cconn->iconn);
2662 write_lock_bh(&csk->callback_lock);
2663 cep->csk->user_data = NULL;
2664 cconn->cep = NULL;
2665 write_unlock_bh(&csk->callback_lock);
2666 }
2667 iscsi_destroy_endpoint(ep);
2668
2669 if (likely(csk->state >= CTP_ESTABLISHED))
2670 need_active_close(csk);
2671 else
2672 cxgbi_sock_closed(csk);
2673
2674 cxgbi_sock_put(csk);
2675}
2676EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2677
2678int cxgbi_iscsi_init(struct iscsi_transport *itp,
2679 struct scsi_transport_template **stt)
2680{
2681 *stt = iscsi_register_transport(itp);
2682 if (*stt == NULL) {
2683 pr_err("unable to register %s transport 0x%p.\n",
2684 itp->name, itp);
2685 return -ENODEV;
2686 }
2687 log_debug(1 << CXGBI_DBG_ISCSI,
2688 "%s, registered iscsi transport 0x%p.\n",
2689 itp->name, stt);
2690 return 0;
2691}
2692EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2693
2694void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2695 struct scsi_transport_template **stt)
2696{
2697 if (*stt) {
2698 log_debug(1 << CXGBI_DBG_ISCSI,
2699 "de-register transport 0x%p, %s, stt 0x%p.\n",
2700 itp, itp->name, *stt);
2701 *stt = NULL;
2702 iscsi_unregister_transport(itp);
2703 }
2704}
2705EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2706
587a1f16 2707umode_t cxgbi_attr_is_visible(int param_type, int param)
3128c6c7
MC		 2708{
2709 switch (param_type) {
f27fb2ef
MC		 2710 case ISCSI_HOST_PARAM:
2711 switch (param) {
2712 case ISCSI_HOST_PARAM_NETDEV_NAME:
2713 case ISCSI_HOST_PARAM_HWADDRESS:
2714 case ISCSI_HOST_PARAM_IPADDRESS:
2715 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2716 return S_IRUGO;
2717 default:
2718 return 0;
2719 }
3128c6c7
MC		 2720 case ISCSI_PARAM:
2721 switch (param) {
2722 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2723 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2724 case ISCSI_PARAM_HDRDGST_EN:
2725 case ISCSI_PARAM_DATADGST_EN:
2726 case ISCSI_PARAM_CONN_ADDRESS:
2727 case ISCSI_PARAM_CONN_PORT:
2728 case ISCSI_PARAM_EXP_STATSN:
2729 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2730 case ISCSI_PARAM_PERSISTENT_PORT:
2731 case ISCSI_PARAM_PING_TMO:
2732 case ISCSI_PARAM_RECV_TMO:
1d063c17
MC		 2733 case ISCSI_PARAM_INITIAL_R2T_EN:
2734 case ISCSI_PARAM_MAX_R2T:
2735 case ISCSI_PARAM_IMM_DATA_EN:
2736 case ISCSI_PARAM_FIRST_BURST:
2737 case ISCSI_PARAM_MAX_BURST:
2738 case ISCSI_PARAM_PDU_INORDER_EN:
2739 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2740 case ISCSI_PARAM_ERL:
2741 case ISCSI_PARAM_TARGET_NAME:
2742 case ISCSI_PARAM_TPGT:
2743 case ISCSI_PARAM_USERNAME:
2744 case ISCSI_PARAM_PASSWORD:
2745 case ISCSI_PARAM_USERNAME_IN:
2746 case ISCSI_PARAM_PASSWORD_IN:
2747 case ISCSI_PARAM_FAST_ABORT:
2748 case ISCSI_PARAM_ABORT_TMO:
2749 case ISCSI_PARAM_LU_RESET_TMO:
2750 case ISCSI_PARAM_TGT_RESET_TMO:
2751 case ISCSI_PARAM_IFACE_NAME:
2752 case ISCSI_PARAM_INITIATOR_NAME:
3128c6c7
MC		 2753 return S_IRUGO;
2754 default:
2755 return 0;
2756 }
2757 }
2758
2759 return 0;
2760}
2761EXPORT_SYMBOL_GPL(cxgbi_attr_is_visible);
2762
9ba682f0 2763static int __init libcxgbi_init_module(void)
2764{
0ea5bf3d 2765 pr_info("%s", version);
75b61250
VP		 2766
2767 BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, cb) <
2768 sizeof(struct cxgbi_skb_cb));
9ba682f0 2769 return 0;
2770}
2771
2772static void __exit libcxgbi_exit_module(void)
2773{
2774 cxgbi_device_unregister_all(0xFF);
2775 return;
2776}
2777
2778module_init(libcxgbi_init_module);
2779module_exit(libcxgbi_exit_module);
Linux 6.x block layer and io_uring tree(s)