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cxgbi: update copyright to 2015
[deliverable/linux.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"
41#define DRV_MODULE_VERSION "0.9.0"
42#define DRV_MODULE_RELDATE "Jun. 2010"
43
44MODULE_AUTHOR("Chelsio Communications, Inc.");
45MODULE_DESCRIPTION(DRV_MODULE_DESC);
46MODULE_VERSION(DRV_MODULE_VERSION);
47MODULE_LICENSE("GPL");
48
49module_param(dbg_level, uint, 0644);
50MODULE_PARM_DESC(dbg_level, "libiscsi debug level (default=0)");
51
52
53/*
54 * cxgbi device management
55 * maintains a list of the cxgbi devices
56 */
57static LIST_HEAD(cdev_list);
58static DEFINE_MUTEX(cdev_mutex);
59
576b5863
AB		 60static LIST_HEAD(cdev_rcu_list);
61static DEFINE_SPINLOCK(cdev_rcu_lock);
62
9ba682f0 63int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
64 unsigned int max_conn)
65{
66 struct cxgbi_ports_map *pmap = &cdev->pmap;
67
68 pmap->port_csk = cxgbi_alloc_big_mem(max_conn *
69 sizeof(struct cxgbi_sock *),
70 GFP_KERNEL);
71 if (!pmap->port_csk) {
72 pr_warn("cdev 0x%p, portmap OOM %u.\n", cdev, max_conn);
73 return -ENOMEM;
74 }
75
76 pmap->max_connect = max_conn;
77 pmap->sport_base = base;
78 spin_lock_init(&pmap->lock);
79 return 0;
80}
81EXPORT_SYMBOL_GPL(cxgbi_device_portmap_create);
82
83void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev)
84{
85 struct cxgbi_ports_map *pmap = &cdev->pmap;
86 struct cxgbi_sock *csk;
87 int i;
88
89 for (i = 0; i < pmap->max_connect; i++) {
90 if (pmap->port_csk[i]) {
91 csk = pmap->port_csk[i];
92 pmap->port_csk[i] = NULL;
93 log_debug(1 << CXGBI_DBG_SOCK,
94 "csk 0x%p, cdev 0x%p, offload down.\n",
95 csk, cdev);
96 spin_lock_bh(&csk->lock);
97 cxgbi_sock_set_flag(csk, CTPF_OFFLOAD_DOWN);
98 cxgbi_sock_closed(csk);
99 spin_unlock_bh(&csk->lock);
100 cxgbi_sock_put(csk);
101 }
102 }
103}
104EXPORT_SYMBOL_GPL(cxgbi_device_portmap_cleanup);
105
106static inline void cxgbi_device_destroy(struct cxgbi_device *cdev)
107{
108 log_debug(1 << CXGBI_DBG_DEV,
109 "cdev 0x%p, p# %u.\n", cdev, cdev->nports);
110 cxgbi_hbas_remove(cdev);
111 cxgbi_device_portmap_cleanup(cdev);
112 if (cdev->dev_ddp_cleanup)
113 cdev->dev_ddp_cleanup(cdev);
114 else
115 cxgbi_ddp_cleanup(cdev);
116 if (cdev->ddp)
117 cxgbi_ddp_cleanup(cdev);
118 if (cdev->pmap.max_connect)
119 cxgbi_free_big_mem(cdev->pmap.port_csk);
120 kfree(cdev);
121}
122
123struct cxgbi_device *cxgbi_device_register(unsigned int extra,
124 unsigned int nports)
125{
126 struct cxgbi_device *cdev;
127
128 cdev = kzalloc(sizeof(*cdev) + extra + nports *
129 (sizeof(struct cxgbi_hba *) +
130 sizeof(struct net_device *)),
131 GFP_KERNEL);
132 if (!cdev) {
133 pr_warn("nport %d, OOM.\n", nports);
134 return NULL;
135 }
136 cdev->ports = (struct net_device **)(cdev + 1);
137 cdev->hbas = (struct cxgbi_hba **)(((char*)cdev->ports) + nports *
138 sizeof(struct net_device *));
139 if (extra)
140 cdev->dd_data = ((char *)cdev->hbas) +
141 nports * sizeof(struct cxgbi_hba *);
142 spin_lock_init(&cdev->pmap.lock);
143
144 mutex_lock(&cdev_mutex);
145 list_add_tail(&cdev->list_head, &cdev_list);
146 mutex_unlock(&cdev_mutex);
147
576b5863
AB		 148 spin_lock(&cdev_rcu_lock);
149 list_add_tail_rcu(&cdev->rcu_node, &cdev_rcu_list);
150 spin_unlock(&cdev_rcu_lock);
151
9ba682f0 152 log_debug(1 << CXGBI_DBG_DEV,
153 "cdev 0x%p, p# %u.\n", cdev, nports);
154 return cdev;
155}
156EXPORT_SYMBOL_GPL(cxgbi_device_register);
157
158void cxgbi_device_unregister(struct cxgbi_device *cdev)
159{
160 log_debug(1 << CXGBI_DBG_DEV,
161 "cdev 0x%p, p# %u,%s.\n",
162 cdev, cdev->nports, cdev->nports ? cdev->ports[0]->name : "");
576b5863 163
9ba682f0 164 mutex_lock(&cdev_mutex);
165 list_del(&cdev->list_head);
166 mutex_unlock(&cdev_mutex);
576b5863
AB		 167
168 spin_lock(&cdev_rcu_lock);
169 list_del_rcu(&cdev->rcu_node);
170 spin_unlock(&cdev_rcu_lock);
171 synchronize_rcu();
172
9ba682f0 173 cxgbi_device_destroy(cdev);
174}
175EXPORT_SYMBOL_GPL(cxgbi_device_unregister);
176
177void cxgbi_device_unregister_all(unsigned int flag)
178{
179 struct cxgbi_device *cdev, *tmp;
180
181 mutex_lock(&cdev_mutex);
182 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
183 if ((cdev->flags & flag) == flag) {
576b5863
AB		 184 mutex_unlock(&cdev_mutex);
185 cxgbi_device_unregister(cdev);
186 mutex_lock(&cdev_mutex);
9ba682f0 187 }
188 }
189 mutex_unlock(&cdev_mutex);
190}
191EXPORT_SYMBOL_GPL(cxgbi_device_unregister_all);
192
193struct cxgbi_device *cxgbi_device_find_by_lldev(void *lldev)
194{
195 struct cxgbi_device *cdev, *tmp;
196
197 mutex_lock(&cdev_mutex);
198 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
199 if (cdev->lldev == lldev) {
200 mutex_unlock(&cdev_mutex);
201 return cdev;
202 }
203 }
204 mutex_unlock(&cdev_mutex);
576b5863 205
9ba682f0 206 log_debug(1 << CXGBI_DBG_DEV,
207 "lldev 0x%p, NO match found.\n", lldev);
208 return NULL;
209}
210EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev);
211
fc8d0590
AB		 212struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev,
213 int *port)
9ba682f0 214{
0b3d8947 215 struct net_device *vdev = NULL;
9ba682f0 216 struct cxgbi_device *cdev, *tmp;
217 int i;
218
0b3d8947 219 if (ndev->priv_flags & IFF_802_1Q_VLAN) {
220 vdev = ndev;
9ba682f0 221 ndev = vlan_dev_real_dev(ndev);
0b3d8947 222 log_debug(1 << CXGBI_DBG_DEV,
223 "vlan dev %s -> %s.\n", vdev->name, ndev->name);
224 }
9ba682f0 225
226 mutex_lock(&cdev_mutex);
227 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
228 for (i = 0; i < cdev->nports; i++) {
229 if (ndev == cdev->ports[i]) {
0b3d8947 230 cdev->hbas[i]->vdev = vdev;
9ba682f0 231 mutex_unlock(&cdev_mutex);
232 if (port)
233 *port = i;
234 return cdev;
235 }
236 }
237 }
238 mutex_unlock(&cdev_mutex);
239 log_debug(1 << CXGBI_DBG_DEV,
240 "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
241 return NULL;
242}
fc8d0590
AB		 243EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev);
244
576b5863
AB		 245struct cxgbi_device *cxgbi_device_find_by_netdev_rcu(struct net_device *ndev,
246 int *port)
247{
248 struct net_device *vdev = NULL;
249 struct cxgbi_device *cdev;
250 int i;
251
252 if (ndev->priv_flags & IFF_802_1Q_VLAN) {
253 vdev = ndev;
254 ndev = vlan_dev_real_dev(ndev);
255 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
256 }
257
258 rcu_read_lock();
259 list_for_each_entry_rcu(cdev, &cdev_rcu_list, rcu_node) {
260 for (i = 0; i < cdev->nports; i++) {
261 if (ndev == cdev->ports[i]) {
262 cdev->hbas[i]->vdev = vdev;
263 rcu_read_unlock();
264 if (port)
265 *port = i;
266 return cdev;
267 }
268 }
269 }
270 rcu_read_unlock();
271
272 log_debug(1 << CXGBI_DBG_DEV,
273 "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
274 return NULL;
275}
276EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev_rcu);
277
f42bb57c 278#if IS_ENABLED(CONFIG_IPV6)
fc8d0590
AB		 279static struct cxgbi_device *cxgbi_device_find_by_mac(struct net_device *ndev,
280 int *port)
281{
282 struct net_device *vdev = NULL;
283 struct cxgbi_device *cdev, *tmp;
284 int i;
285
286 if (ndev->priv_flags & IFF_802_1Q_VLAN) {
287 vdev = ndev;
288 ndev = vlan_dev_real_dev(ndev);
289 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
290 }
291
292 mutex_lock(&cdev_mutex);
293 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
294 for (i = 0; i < cdev->nports; i++) {
295 if (!memcmp(ndev->dev_addr, cdev->ports[i]->dev_addr,
296 MAX_ADDR_LEN)) {
297 cdev->hbas[i]->vdev = vdev;
298 mutex_unlock(&cdev_mutex);
299 if (port)
300 *port = i;
301 return cdev;
302 }
303 }
304 }
305 mutex_unlock(&cdev_mutex);
306 log_debug(1 << CXGBI_DBG_DEV,
307 "ndev 0x%p, %s, NO match mac found.\n",
308 ndev, ndev->name);
309 return NULL;
310}
f42bb57c 311#endif
9ba682f0 312
9ba682f0 313void cxgbi_hbas_remove(struct cxgbi_device *cdev)
314{
315 int i;
316 struct cxgbi_hba *chba;
317
318 log_debug(1 << CXGBI_DBG_DEV,
319 "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
320
321 for (i = 0; i < cdev->nports; i++) {
322 chba = cdev->hbas[i];
323 if (chba) {
324 cdev->hbas[i] = NULL;
325 iscsi_host_remove(chba->shost);
326 pci_dev_put(cdev->pdev);
327 iscsi_host_free(chba->shost);
328 }
329 }
330}
331EXPORT_SYMBOL_GPL(cxgbi_hbas_remove);
332
1abf635d 333int cxgbi_hbas_add(struct cxgbi_device *cdev, u64 max_lun,
9ba682f0 334 unsigned int max_id, struct scsi_host_template *sht,
335 struct scsi_transport_template *stt)
336{
337 struct cxgbi_hba *chba;
338 struct Scsi_Host *shost;
339 int i, err;
340
341 log_debug(1 << CXGBI_DBG_DEV, "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
342
343 for (i = 0; i < cdev->nports; i++) {
344 shost = iscsi_host_alloc(sht, sizeof(*chba), 1);
345 if (!shost) {
346 pr_info("0x%p, p%d, %s, host alloc failed.\n",
347 cdev, i, cdev->ports[i]->name);
348 err = -ENOMEM;
349 goto err_out;
350 }
351
352 shost->transportt = stt;
353 shost->max_lun = max_lun;
354 shost->max_id = max_id;
355 shost->max_channel = 0;
356 shost->max_cmd_len = 16;
357
358 chba = iscsi_host_priv(shost);
359 chba->cdev = cdev;
360 chba->ndev = cdev->ports[i];
361 chba->shost = shost;
362
363 log_debug(1 << CXGBI_DBG_DEV,
364 "cdev 0x%p, p#%d %s: chba 0x%p.\n",
365 cdev, i, cdev->ports[i]->name, chba);
366
367 pci_dev_get(cdev->pdev);
368 err = iscsi_host_add(shost, &cdev->pdev->dev);
369 if (err) {
370 pr_info("cdev 0x%p, p#%d %s, host add failed.\n",
371 cdev, i, cdev->ports[i]->name);
372 pci_dev_put(cdev->pdev);
373 scsi_host_put(shost);
374 goto err_out;
375 }
376
377 cdev->hbas[i] = chba;
378 }
379
380 return 0;
381
382err_out:
383 cxgbi_hbas_remove(cdev);
384 return err;
385}
386EXPORT_SYMBOL_GPL(cxgbi_hbas_add);
387
388/*
389 * iSCSI offload
390 *
391 * - source port management
392 * To find a free source port in the port allocation map we use a very simple
393 * rotor scheme to look for the next free port.
394 *
395 * If a source port has been specified make sure that it doesn't collide with
396 * our normal source port allocation map. If it's outside the range of our
397 * allocation/deallocation scheme just let them use it.
398 *
399 * If the source port is outside our allocation range, the caller is
400 * responsible for keeping track of their port usage.
401 */
dd9ad67e
AB		 402
403static struct cxgbi_sock *find_sock_on_port(struct cxgbi_device *cdev,
404 unsigned char port_id)
405{
406 struct cxgbi_ports_map *pmap = &cdev->pmap;
407 unsigned int i;
408 unsigned int used;
409
410 if (!pmap->max_connect || !pmap->used)
411 return NULL;
412
413 spin_lock_bh(&pmap->lock);
414 used = pmap->used;
415 for (i = 0; used && i < pmap->max_connect; i++) {
416 struct cxgbi_sock *csk = pmap->port_csk[i];
417
418 if (csk) {
419 if (csk->port_id == port_id) {
420 spin_unlock_bh(&pmap->lock);
421 return csk;
422 }
423 used--;
424 }
425 }
426 spin_unlock_bh(&pmap->lock);
427
428 return NULL;
429}
430
9ba682f0 431static int sock_get_port(struct cxgbi_sock *csk)
432{
433 struct cxgbi_device *cdev = csk->cdev;
434 struct cxgbi_ports_map *pmap = &cdev->pmap;
435 unsigned int start;
436 int idx;
fc8d0590 437 __be16 *port;
9ba682f0 438
439 if (!pmap->max_connect) {
440 pr_err("cdev 0x%p, p#%u %s, NO port map.\n",
441 cdev, csk->port_id, cdev->ports[csk->port_id]->name);
442 return -EADDRNOTAVAIL;
443 }
444
fc8d0590
AB		 445 if (csk->csk_family == AF_INET)
446 port = &csk->saddr.sin_port;
447 else /* ipv6 */
448 port = &csk->saddr6.sin6_port;
449
450 if (*port) {
9ba682f0 451 pr_err("source port NON-ZERO %u.\n",
fc8d0590 452 ntohs(*port));
9ba682f0 453 return -EADDRINUSE;
454 }
455
456 spin_lock_bh(&pmap->lock);
457 if (pmap->used >= pmap->max_connect) {
458 spin_unlock_bh(&pmap->lock);
459 pr_info("cdev 0x%p, p#%u %s, ALL ports used.\n",
460 cdev, csk->port_id, cdev->ports[csk->port_id]->name);
461 return -EADDRNOTAVAIL;
462 }
463
464 start = idx = pmap->next;
465 do {
466 if (++idx >= pmap->max_connect)
467 idx = 0;
468 if (!pmap->port_csk[idx]) {
469 pmap->used++;
fc8d0590 470 *port = htons(pmap->sport_base + idx);
9ba682f0 471 pmap->next = idx;
472 pmap->port_csk[idx] = csk;
473 spin_unlock_bh(&pmap->lock);
474 cxgbi_sock_get(csk);
475 log_debug(1 << CXGBI_DBG_SOCK,
476 "cdev 0x%p, p#%u %s, p %u, %u.\n",
477 cdev, csk->port_id,
478 cdev->ports[csk->port_id]->name,
479 pmap->sport_base + idx, pmap->next);
480 return 0;
481 }
482 } while (idx != start);
483 spin_unlock_bh(&pmap->lock);
484
485 /* should not happen */
486 pr_warn("cdev 0x%p, p#%u %s, next %u?\n",
487 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
488 pmap->next);
489 return -EADDRNOTAVAIL;
490}
491
492static void sock_put_port(struct cxgbi_sock *csk)
493{
494 struct cxgbi_device *cdev = csk->cdev;
495 struct cxgbi_ports_map *pmap = &cdev->pmap;
fc8d0590 496 __be16 *port;
9ba682f0 497
fc8d0590
AB		 498 if (csk->csk_family == AF_INET)
499 port = &csk->saddr.sin_port;
500 else /* ipv6 */
501 port = &csk->saddr6.sin6_port;
9ba682f0 502
fc8d0590
AB		 503 if (*port) {
504 int idx = ntohs(*port) - pmap->sport_base;
505
506 *port = 0;
9ba682f0 507 if (idx < 0 || idx >= pmap->max_connect) {
508 pr_err("cdev 0x%p, p#%u %s, port %u OOR.\n",
509 cdev, csk->port_id,
510 cdev->ports[csk->port_id]->name,
fc8d0590 511 ntohs(*port));
9ba682f0 512 return;
513 }
514
515 spin_lock_bh(&pmap->lock);
516 pmap->port_csk[idx] = NULL;
517 pmap->used--;
518 spin_unlock_bh(&pmap->lock);
519
520 log_debug(1 << CXGBI_DBG_SOCK,
521 "cdev 0x%p, p#%u %s, release %u.\n",
522 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
523 pmap->sport_base + idx);
524
525 cxgbi_sock_put(csk);
526 }
527}
528
529/*
530 * iscsi tcp connection
531 */
532void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *csk)
533{
534 if (csk->cpl_close) {
535 kfree_skb(csk->cpl_close);
536 csk->cpl_close = NULL;
537 }
538 if (csk->cpl_abort_req) {
539 kfree_skb(csk->cpl_abort_req);
540 csk->cpl_abort_req = NULL;
541 }
542 if (csk->cpl_abort_rpl) {
543 kfree_skb(csk->cpl_abort_rpl);
544 csk->cpl_abort_rpl = NULL;
545 }
546}
547EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs);
548
549static struct cxgbi_sock *cxgbi_sock_create(struct cxgbi_device *cdev)
550{
551 struct cxgbi_sock *csk = kzalloc(sizeof(*csk), GFP_NOIO);
552
553 if (!csk) {
554 pr_info("alloc csk %zu failed.\n", sizeof(*csk));
555 return NULL;
556 }
557
558 if (cdev->csk_alloc_cpls(csk) < 0) {
559 pr_info("csk 0x%p, alloc cpls failed.\n", csk);
560 kfree(csk);
561 return NULL;
562 }
563
564 spin_lock_init(&csk->lock);
565 kref_init(&csk->refcnt);
566 skb_queue_head_init(&csk->receive_queue);
567 skb_queue_head_init(&csk->write_queue);
568 setup_timer(&csk->retry_timer, NULL, (unsigned long)csk);
569 rwlock_init(&csk->callback_lock);
570 csk->cdev = cdev;
571 csk->flags = 0;
572 cxgbi_sock_set_state(csk, CTP_CLOSED);
573
574 log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk);
575
576 return csk;
577}
578
f4bfd99f
DM		 579static struct rtable *find_route_ipv4(struct flowi4 *fl4,
580 __be32 saddr, __be32 daddr,
78fbfd8a 581 __be16 sport, __be16 dport, u8 tos)
9ba682f0 582{
583 struct rtable *rt;
9ba682f0 584
f4bfd99f 585 rt = ip_route_output_ports(&init_net, fl4, NULL, daddr, saddr,
78fbfd8a 586 dport, sport, IPPROTO_TCP, tos, 0);
b23dd4fe 587 if (IS_ERR(rt))
9ba682f0 588 return NULL;
589
590 return rt;
591}
592
593static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr)
594{
595 struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
596 struct dst_entry *dst;
597 struct net_device *ndev;
598 struct cxgbi_device *cdev;
599 struct rtable *rt = NULL;
a58b61e5 600 struct neighbour *n;
f4bfd99f 601 struct flowi4 fl4;
9ba682f0 602 struct cxgbi_sock *csk = NULL;
603 unsigned int mtu = 0;
604 int port = 0xFFFF;
605 int err = 0;
606
f4bfd99f 607 rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0, daddr->sin_port, 0);
9ba682f0 608 if (!rt) {
609 pr_info("no route to ipv4 0x%x, port %u.\n",
fc8d0590
AB		 610 be32_to_cpu(daddr->sin_addr.s_addr),
611 be16_to_cpu(daddr->sin_port));
9ba682f0 612 err = -ENETUNREACH;
613 goto err_out;
614 }
615 dst = &rt->dst;
0b399d46 616 n = dst_neigh_lookup(dst, &daddr->sin_addr.s_addr);
a58b61e5
DM		 617 if (!n) {
618 err = -ENODEV;
619 goto rel_rt;
620 }
621 ndev = n->dev;
9ba682f0 622
623 if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
624 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
625 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
626 ndev->name);
627 err = -ENETUNREACH;
0b399d46 628 goto rel_neigh;
9ba682f0 629 }
630
631 if (ndev->flags & IFF_LOOPBACK) {
632 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
633 mtu = ndev->mtu;
634 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
a58b61e5 635 n->dev->name, ndev->name, mtu);
9ba682f0 636 }
637
9ba682f0 638 cdev = cxgbi_device_find_by_netdev(ndev, &port);
639 if (!cdev) {
640 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
641 &daddr->sin_addr.s_addr, ndev->name);
642 err = -ENETUNREACH;
0b399d46 643 goto rel_neigh;
9ba682f0 644 }
645 log_debug(1 << CXGBI_DBG_SOCK,
646 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
647 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
648 port, ndev->name, cdev);
649
650 csk = cxgbi_sock_create(cdev);
651 if (!csk) {
652 err = -ENOMEM;
0b399d46 653 goto rel_neigh;
9ba682f0 654 }
655 csk->cdev = cdev;
656 csk->port_id = port;
657 csk->mtu = mtu;
658 csk->dst = dst;
fc8d0590
AB		 659
660 csk->csk_family = AF_INET;
9ba682f0 661 csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
662 csk->daddr.sin_port = daddr->sin_port;
c71b9b66 663 csk->daddr.sin_family = daddr->sin_family;
fc8d0590 664 csk->saddr.sin_family = daddr->sin_family;
f4bfd99f 665 csk->saddr.sin_addr.s_addr = fl4.saddr;
0b399d46 666 neigh_release(n);
9ba682f0 667
668 return csk;
669
0b399d46
DM		 670rel_neigh:
671 neigh_release(n);
672
9ba682f0 673rel_rt:
674 ip_rt_put(rt);
675 if (csk)
676 cxgbi_sock_closed(csk);
677err_out:
678 return ERR_PTR(err);
679}
680
e81fbf6c 681#if IS_ENABLED(CONFIG_IPV6)
fc8d0590
AB		 682static struct rt6_info *find_route_ipv6(const struct in6_addr *saddr,
683 const struct in6_addr *daddr)
684{
685 struct flowi6 fl;
686
687 if (saddr)
688 memcpy(&fl.saddr, saddr, sizeof(struct in6_addr));
689 if (daddr)
690 memcpy(&fl.daddr, daddr, sizeof(struct in6_addr));
691 return (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl);
692}
693
694static struct cxgbi_sock *cxgbi_check_route6(struct sockaddr *dst_addr)
695{
696 struct sockaddr_in6 *daddr6 = (struct sockaddr_in6 *)dst_addr;
697 struct dst_entry *dst;
698 struct net_device *ndev;
699 struct cxgbi_device *cdev;
700 struct rt6_info *rt = NULL;
701 struct neighbour *n;
702 struct in6_addr pref_saddr;
703 struct cxgbi_sock *csk = NULL;
704 unsigned int mtu = 0;
705 int port = 0xFFFF;
706 int err = 0;
707
708 rt = find_route_ipv6(NULL, &daddr6->sin6_addr);
709
710 if (!rt) {
711 pr_info("no route to ipv6 %pI6 port %u\n",
712 daddr6->sin6_addr.s6_addr,
713 be16_to_cpu(daddr6->sin6_port));
714 err = -ENETUNREACH;
715 goto err_out;
716 }
717
718 dst = &rt->dst;
719
720 n = dst_neigh_lookup(dst, &daddr6->sin6_addr);
721
722 if (!n) {
723 pr_info("%pI6, port %u, dst no neighbour.\n",
724 daddr6->sin6_addr.s6_addr,
725 be16_to_cpu(daddr6->sin6_port));
726 err = -ENETUNREACH;
727 goto rel_rt;
728 }
729 ndev = n->dev;
730
731 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
732 pr_info("multi-cast route %pI6 port %u, dev %s.\n",
733 daddr6->sin6_addr.s6_addr,
734 ntohs(daddr6->sin6_port), ndev->name);
735 err = -ENETUNREACH;
736 goto rel_rt;
737 }
738
739 cdev = cxgbi_device_find_by_netdev(ndev, &port);
740 if (!cdev)
741 cdev = cxgbi_device_find_by_mac(ndev, &port);
742 if (!cdev) {
743 pr_info("dst %pI6 %s, NOT cxgbi device.\n",
744 daddr6->sin6_addr.s6_addr, ndev->name);
745 err = -ENETUNREACH;
746 goto rel_rt;
747 }
748 log_debug(1 << CXGBI_DBG_SOCK,
749 "route to %pI6 :%u, ndev p#%d,%s, cdev 0x%p.\n",
750 daddr6->sin6_addr.s6_addr, ntohs(daddr6->sin6_port), port,
751 ndev->name, cdev);
752
753 csk = cxgbi_sock_create(cdev);
754 if (!csk) {
755 err = -ENOMEM;
756 goto rel_rt;
757 }
758 csk->cdev = cdev;
759 csk->port_id = port;
760 csk->mtu = mtu;
761 csk->dst = dst;
762
763 if (ipv6_addr_any(&rt->rt6i_prefsrc.addr)) {
764 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry *)rt);
765
766 err = ipv6_dev_get_saddr(&init_net, idev ? idev->dev : NULL,
767 &daddr6->sin6_addr, 0, &pref_saddr);
768 if (err) {
769 pr_info("failed to get source address to reach %pI6\n",
770 &daddr6->sin6_addr);
771 goto rel_rt;
772 }
773 } else {
774 pref_saddr = rt->rt6i_prefsrc.addr;
775 }
776
777 csk->csk_family = AF_INET6;
778 csk->daddr6.sin6_addr = daddr6->sin6_addr;
779 csk->daddr6.sin6_port = daddr6->sin6_port;
780 csk->daddr6.sin6_family = daddr6->sin6_family;
dd9ad67e 781 csk->saddr6.sin6_family = daddr6->sin6_family;
fc8d0590
AB		 782 csk->saddr6.sin6_addr = pref_saddr;
783
784 neigh_release(n);
785 return csk;
786
787rel_rt:
788 if (n)
789 neigh_release(n);
790
791 ip6_rt_put(rt);
792 if (csk)
793 cxgbi_sock_closed(csk);
794err_out:
795 return ERR_PTR(err);
796}
e81fbf6c 797#endif /* IS_ENABLED(CONFIG_IPV6) */
fc8d0590 798
9ba682f0 799void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
800 unsigned int opt)
801{
802 csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
803 dst_confirm(csk->dst);
804 smp_mb();
805 cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
806}
807EXPORT_SYMBOL_GPL(cxgbi_sock_established);
808
809static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
810{
811 log_debug(1 << CXGBI_DBG_SOCK,
812 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
813 csk, csk->state, csk->flags, csk->user_data);
814
815 if (csk->state != CTP_ESTABLISHED) {
e3d2ad8c 816 read_lock_bh(&csk->callback_lock);
9ba682f0 817 if (csk->user_data)
818 iscsi_conn_failure(csk->user_data,
ee7255ad 819 ISCSI_ERR_TCP_CONN_CLOSE);
e3d2ad8c 820 read_unlock_bh(&csk->callback_lock);
9ba682f0 821 }
822}
823
824void cxgbi_sock_closed(struct cxgbi_sock *csk)
825{
826 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
827 csk, (csk)->state, (csk)->flags, (csk)->tid);
828 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
829 if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
830 return;
831 if (csk->saddr.sin_port)
832 sock_put_port(csk);
833 if (csk->dst)
834 dst_release(csk->dst);
835 csk->cdev->csk_release_offload_resources(csk);
836 cxgbi_sock_set_state(csk, CTP_CLOSED);
837 cxgbi_inform_iscsi_conn_closing(csk);
838 cxgbi_sock_put(csk);
839}
840EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
841
842static void need_active_close(struct cxgbi_sock *csk)
843{
844 int data_lost;
845 int close_req = 0;
846
847 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
848 csk, (csk)->state, (csk)->flags, (csk)->tid);
849 spin_lock_bh(&csk->lock);
850 dst_confirm(csk->dst);
851 data_lost = skb_queue_len(&csk->receive_queue);
852 __skb_queue_purge(&csk->receive_queue);
853
854 if (csk->state == CTP_ACTIVE_OPEN)
855 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
856 else if (csk->state == CTP_ESTABLISHED) {
857 close_req = 1;
858 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
859 } else if (csk->state == CTP_PASSIVE_CLOSE) {
860 close_req = 1;
861 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
862 }
863
864 if (close_req) {
865 if (data_lost)
866 csk->cdev->csk_send_abort_req(csk);
867 else
868 csk->cdev->csk_send_close_req(csk);
869 }
870
871 spin_unlock_bh(&csk->lock);
872}
873
874void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
875{
876 pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
877 csk, csk->state, csk->flags,
878 &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
879 &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
880 errno);
881
882 cxgbi_sock_set_state(csk, CTP_CONNECTING);
883 csk->err = errno;
884 cxgbi_sock_closed(csk);
885}
886EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
887
888void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
889{
890 struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
891
892 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
893 csk, (csk)->state, (csk)->flags, (csk)->tid);
894 cxgbi_sock_get(csk);
895 spin_lock_bh(&csk->lock);
896 if (csk->state == CTP_ACTIVE_OPEN)
897 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
898 spin_unlock_bh(&csk->lock);
899 cxgbi_sock_put(csk);
900 __kfree_skb(skb);
901}
902EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
903
904void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
905{
906 cxgbi_sock_get(csk);
907 spin_lock_bh(&csk->lock);
7b07bf24
AB		 908
909 cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
9ba682f0 910 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
7b07bf24
AB		 911 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
912 if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
913 pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
914 csk, csk->state, csk->flags, csk->tid);
915 cxgbi_sock_closed(csk);
9ba682f0 916 }
7b07bf24 917
9ba682f0 918 spin_unlock_bh(&csk->lock);
919 cxgbi_sock_put(csk);
920}
921EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
922
923void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
924{
925 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
926 csk, (csk)->state, (csk)->flags, (csk)->tid);
927 cxgbi_sock_get(csk);
928 spin_lock_bh(&csk->lock);
929
930 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
931 goto done;
932
933 switch (csk->state) {
934 case CTP_ESTABLISHED:
935 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
936 break;
937 case CTP_ACTIVE_CLOSE:
938 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
939 break;
940 case CTP_CLOSE_WAIT_1:
941 cxgbi_sock_closed(csk);
942 break;
943 case CTP_ABORTING:
944 break;
945 default:
946 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
947 csk, csk->state, csk->flags, csk->tid);
948 }
949 cxgbi_inform_iscsi_conn_closing(csk);
950done:
951 spin_unlock_bh(&csk->lock);
952 cxgbi_sock_put(csk);
953}
954EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
955
956void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
957{
958 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
959 csk, (csk)->state, (csk)->flags, (csk)->tid);
960 cxgbi_sock_get(csk);
961 spin_lock_bh(&csk->lock);
962
963 csk->snd_una = snd_nxt - 1;
964 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
965 goto done;
966
967 switch (csk->state) {
968 case CTP_ACTIVE_CLOSE:
969 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
970 break;
971 case CTP_CLOSE_WAIT_1:
972 case CTP_CLOSE_WAIT_2:
973 cxgbi_sock_closed(csk);
974 break;
975 case CTP_ABORTING:
976 break;
977 default:
978 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
979 csk, csk->state, csk->flags, csk->tid);
980 }
981done:
982 spin_unlock_bh(&csk->lock);
983 cxgbi_sock_put(csk);
984}
985EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
986
987void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
988 unsigned int snd_una, int seq_chk)
989{
990 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
991 "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
992 csk, csk->state, csk->flags, csk->tid, credits,
993 csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
994
995 spin_lock_bh(&csk->lock);
996
997 csk->wr_cred += credits;
998 if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
999 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
1000
1001 while (credits) {
1002 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
1003
1004 if (unlikely(!p)) {
1005 pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
1006 csk, csk->state, csk->flags, csk->tid, credits,
1007 csk->wr_cred, csk->wr_una_cred);
1008 break;
1009 }
1010
1011 if (unlikely(credits < p->csum)) {
1012 pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
1013 csk, csk->state, csk->flags, csk->tid,
1014 credits, csk->wr_cred, csk->wr_una_cred,
1015 p->csum);
1016 p->csum -= credits;
1017 break;
1018 } else {
1019 cxgbi_sock_dequeue_wr(csk);
1020 credits -= p->csum;
1021 kfree_skb(p);
1022 }
1023 }
1024
1025 cxgbi_sock_check_wr_invariants(csk);
1026
1027 if (seq_chk) {
1028 if (unlikely(before(snd_una, csk->snd_una))) {
1029 pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
1030 csk, csk->state, csk->flags, csk->tid, snd_una,
1031 csk->snd_una);
1032 goto done;
1033 }
1034
1035 if (csk->snd_una != snd_una) {
1036 csk->snd_una = snd_una;
1037 dst_confirm(csk->dst);
1038 }
1039 }
1040
1041 if (skb_queue_len(&csk->write_queue)) {
1042 if (csk->cdev->csk_push_tx_frames(csk, 0))
1043 cxgbi_conn_tx_open(csk);
1044 } else
1045 cxgbi_conn_tx_open(csk);
1046done:
1047 spin_unlock_bh(&csk->lock);
1048}
1049EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
1050
1051static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
1052 unsigned short mtu)
1053{
1054 int i = 0;
1055
1056 while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
1057 ++i;
1058
1059 return i;
1060}
1061
1062unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
1063{
1064 unsigned int idx;
1065 struct dst_entry *dst = csk->dst;
1066
0dbaee3b 1067 csk->advmss = dst_metric_advmss(dst);
9ba682f0 1068
1069 if (csk->advmss > pmtu - 40)
1070 csk->advmss = pmtu - 40;
1071 if (csk->advmss < csk->cdev->mtus[0] - 40)
1072 csk->advmss = csk->cdev->mtus[0] - 40;
1073 idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
1074
1075 return idx;
1076}
1077EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
1078
1079void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
1080{
1081 cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
1082 __skb_queue_tail(&csk->write_queue, skb);
1083}
1084EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
1085
1086void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
1087{
1088 struct sk_buff *skb;
1089
1090 while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
1091 kfree_skb(skb);
1092}
1093EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
1094
1095void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
1096{
1097 int pending = cxgbi_sock_count_pending_wrs(csk);
1098
1099 if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
1100 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
1101 csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
1102}
1103EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
1104
1105static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
1106{
1107 struct cxgbi_device *cdev = csk->cdev;
1108 struct sk_buff *next;
1109 int err, copied = 0;
1110
1111 spin_lock_bh(&csk->lock);
1112
1113 if (csk->state != CTP_ESTABLISHED) {
1114 log_debug(1 << CXGBI_DBG_PDU_TX,
1115 "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
1116 csk, csk->state, csk->flags, csk->tid);
1117 err = -EAGAIN;
1118 goto out_err;
1119 }
1120
1121 if (csk->err) {
1122 log_debug(1 << CXGBI_DBG_PDU_TX,
1123 "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
1124 csk, csk->state, csk->flags, csk->tid, csk->err);
1125 err = -EPIPE;
1126 goto out_err;
1127 }
1128
81daf10c 1129 if (csk->write_seq - csk->snd_una >= csk->snd_win) {
9ba682f0 1130 log_debug(1 << CXGBI_DBG_PDU_TX,
1131 "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
1132 csk, csk->state, csk->flags, csk->tid, csk->write_seq,
81daf10c 1133 csk->snd_una, csk->snd_win);
9ba682f0 1134 err = -ENOBUFS;
1135 goto out_err;
1136 }
1137
1138 while (skb) {
1139 int frags = skb_shinfo(skb)->nr_frags +
1140 (skb->len != skb->data_len);
1141
1142 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
1143 pr_err("csk 0x%p, skb head %u < %u.\n",
1144 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
1145 err = -EINVAL;
1146 goto out_err;
1147 }
1148
1149 if (frags >= SKB_WR_LIST_SIZE) {
1150 pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
1151 csk, skb_shinfo(skb)->nr_frags, skb->len,
1152 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
1153 err = -EINVAL;
1154 goto out_err;
1155 }
1156
1157 next = skb->next;
1158 skb->next = NULL;
1159 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
1160 cxgbi_sock_skb_entail(csk, skb);
1161 copied += skb->len;
1162 csk->write_seq += skb->len +
1163 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
1164 skb = next;
1165 }
1166done:
1167 if (likely(skb_queue_len(&csk->write_queue)))
1168 cdev->csk_push_tx_frames(csk, 1);
1169 spin_unlock_bh(&csk->lock);
1170 return copied;
1171
1172out_err:
1173 if (copied == 0 && err == -EPIPE)
1174 copied = csk->err ? csk->err : -EPIPE;
1175 else
1176 copied = err;
1177 goto done;
1178}
1179
1180/*
1181 * Direct Data Placement -
1182 * Directly place the iSCSI Data-In or Data-Out PDU's payload into pre-posted
1183 * final destination host-memory buffers based on the Initiator Task Tag (ITT)
1184 * in Data-In or Target Task Tag (TTT) in Data-Out PDUs.
1185 * The host memory address is programmed into h/w in the format of pagepod
1186 * entries.
1187 * The location of the pagepod entry is encoded into ddp tag which is used as
1188 * the base for ITT/TTT.
1189 */
1190
1191static unsigned char ddp_page_order[DDP_PGIDX_MAX] = {0, 1, 2, 4};
1192static unsigned char ddp_page_shift[DDP_PGIDX_MAX] = {12, 13, 14, 16};
1193static unsigned char page_idx = DDP_PGIDX_MAX;
1194
1195static unsigned char sw_tag_idx_bits;
1196static unsigned char sw_tag_age_bits;
1197
1198/*
1199 * Direct-Data Placement page size adjustment
1200 */
1201static int ddp_adjust_page_table(void)
1202{
1203 int i;
1204 unsigned int base_order, order;
1205
1206 if (PAGE_SIZE < (1UL << ddp_page_shift[0])) {
1207 pr_info("PAGE_SIZE 0x%lx too small, min 0x%lx\n",
1208 PAGE_SIZE, 1UL << ddp_page_shift[0]);
1209 return -EINVAL;
1210 }
1211
1212 base_order = get_order(1UL << ddp_page_shift[0]);
1213 order = get_order(1UL << PAGE_SHIFT);
1214
1215 for (i = 0; i < DDP_PGIDX_MAX; i++) {
1216 /* first is the kernel page size, then just doubling */
1217 ddp_page_order[i] = order - base_order + i;
1218 ddp_page_shift[i] = PAGE_SHIFT + i;
1219 }
1220 return 0;
1221}
1222
1223static int ddp_find_page_index(unsigned long pgsz)
1224{
1225 int i;
1226
1227 for (i = 0; i < DDP_PGIDX_MAX; i++) {
1228 if (pgsz == (1UL << ddp_page_shift[i]))
1229 return i;
1230 }
1231 pr_info("ddp page size %lu not supported.\n", pgsz);
1232 return DDP_PGIDX_MAX;
1233}
1234
1235static void ddp_setup_host_page_size(void)
1236{
1237 if (page_idx == DDP_PGIDX_MAX) {
1238 page_idx = ddp_find_page_index(PAGE_SIZE);
1239
1240 if (page_idx == DDP_PGIDX_MAX) {
1241 pr_info("system PAGE %lu, update hw.\n", PAGE_SIZE);
1242 if (ddp_adjust_page_table() < 0) {
1243 pr_info("PAGE %lu, disable ddp.\n", PAGE_SIZE);
1244 return;
1245 }
1246 page_idx = ddp_find_page_index(PAGE_SIZE);
1247 }
1248 pr_info("system PAGE %lu, ddp idx %u.\n", PAGE_SIZE, page_idx);
1249 }
1250}
1251
1252void cxgbi_ddp_page_size_factor(int *pgsz_factor)
1253{
1254 int i;
1255
1256 for (i = 0; i < DDP_PGIDX_MAX; i++)
1257 pgsz_factor[i] = ddp_page_order[i];
1258}
1259EXPORT_SYMBOL_GPL(cxgbi_ddp_page_size_factor);
1260
1261/*
1262 * DDP setup & teardown
1263 */
1264
1265void cxgbi_ddp_ppod_set(struct cxgbi_pagepod *ppod,
1266 struct cxgbi_pagepod_hdr *hdr,
1267 struct cxgbi_gather_list *gl, unsigned int gidx)
1268{
1269 int i;
1270
1271 memcpy(ppod, hdr, sizeof(*hdr));
1272 for (i = 0; i < (PPOD_PAGES_MAX + 1); i++, gidx++) {
1273 ppod->addr[i] = gidx < gl->nelem ?
1274 cpu_to_be64(gl->phys_addr[gidx]) : 0ULL;
1275 }
1276}
1277EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_set);
1278
1279void cxgbi_ddp_ppod_clear(struct cxgbi_pagepod *ppod)
1280{
1281 memset(ppod, 0, sizeof(*ppod));
1282}
1283EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_clear);
1284
1285static inline int ddp_find_unused_entries(struct cxgbi_ddp_info *ddp,
1286 unsigned int start, unsigned int max,
1287 unsigned int count,
1288 struct cxgbi_gather_list *gl)
1289{
1290 unsigned int i, j, k;
1291
1292 /* not enough entries */
1293 if ((max - start) < count) {
1294 log_debug(1 << CXGBI_DBG_DDP,
1295 "NOT enough entries %u+%u < %u.\n", start, count, max);
1296 return -EBUSY;
1297 }
1298
1299 max -= count;
1300 spin_lock(&ddp->map_lock);
1301 for (i = start; i < max;) {
1302 for (j = 0, k = i; j < count; j++, k++) {
1303 if (ddp->gl_map[k])
1304 break;
1305 }
1306 if (j == count) {
1307 for (j = 0, k = i; j < count; j++, k++)
1308 ddp->gl_map[k] = gl;
1309 spin_unlock(&ddp->map_lock);
1310 return i;
1311 }
1312 i += j + 1;
1313 }
1314 spin_unlock(&ddp->map_lock);
1315 log_debug(1 << CXGBI_DBG_DDP,
1316 "NO suitable entries %u available.\n", count);
1317 return -EBUSY;
1318}
1319
1320static inline void ddp_unmark_entries(struct cxgbi_ddp_info *ddp,
1321 int start, int count)
1322{
1323 spin_lock(&ddp->map_lock);
1324 memset(&ddp->gl_map[start], 0,
1325 count * sizeof(struct cxgbi_gather_list *));
1326 spin_unlock(&ddp->map_lock);
1327}
1328
1329static inline void ddp_gl_unmap(struct pci_dev *pdev,
1330 struct cxgbi_gather_list *gl)
1331{
1332 int i;
1333
1334 for (i = 0; i < gl->nelem; i++)
1335 dma_unmap_page(&pdev->dev, gl->phys_addr[i], PAGE_SIZE,
1336 PCI_DMA_FROMDEVICE);
1337}
1338
1339static inline int ddp_gl_map(struct pci_dev *pdev,
1340 struct cxgbi_gather_list *gl)
1341{
1342 int i;
1343
1344 for (i = 0; i < gl->nelem; i++) {
1345 gl->phys_addr[i] = dma_map_page(&pdev->dev, gl->pages[i], 0,
1346 PAGE_SIZE,
1347 PCI_DMA_FROMDEVICE);
1348 if (unlikely(dma_mapping_error(&pdev->dev, gl->phys_addr[i]))) {
1349 log_debug(1 << CXGBI_DBG_DDP,
1350 "page %d 0x%p, 0x%p dma mapping err.\n",
1351 i, gl->pages[i], pdev);
1352 goto unmap;
1353 }
1354 }
1355 return i;
1356unmap:
1357 if (i) {
1358 unsigned int nelem = gl->nelem;
1359
1360 gl->nelem = i;
1361 ddp_gl_unmap(pdev, gl);
1362 gl->nelem = nelem;
1363 }
1364 return -EINVAL;
1365}
1366
1367static void ddp_release_gl(struct cxgbi_gather_list *gl,
1368 struct pci_dev *pdev)
1369{
1370 ddp_gl_unmap(pdev, gl);
1371 kfree(gl);
1372}
1373
1374static struct cxgbi_gather_list *ddp_make_gl(unsigned int xferlen,
1375 struct scatterlist *sgl,
1376 unsigned int sgcnt,
1377 struct pci_dev *pdev,
1378 gfp_t gfp)
1379{
1380 struct cxgbi_gather_list *gl;
1381 struct scatterlist *sg = sgl;
1382 struct page *sgpage = sg_page(sg);
1383 unsigned int sglen = sg->length;
1384 unsigned int sgoffset = sg->offset;
1385 unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >>
1386 PAGE_SHIFT;
1387 int i = 1, j = 0;
1388
1389 if (xferlen < DDP_THRESHOLD) {
1390 log_debug(1 << CXGBI_DBG_DDP,
1391 "xfer %u < threshold %u, no ddp.\n",
1392 xferlen, DDP_THRESHOLD);
1393 return NULL;
1394 }
1395
1396 gl = kzalloc(sizeof(struct cxgbi_gather_list) +
1397 npages * (sizeof(dma_addr_t) +
1398 sizeof(struct page *)), gfp);
1399 if (!gl) {
1400 log_debug(1 << CXGBI_DBG_DDP,
1401 "xfer %u, %u pages, OOM.\n", xferlen, npages);
1402 return NULL;
1403 }
1404
1405 log_debug(1 << CXGBI_DBG_DDP,
1406 "xfer %u, sgl %u, gl max %u.\n", xferlen, sgcnt, npages);
1407
1408 gl->pages = (struct page **)&gl->phys_addr[npages];
1409 gl->nelem = npages;
1410 gl->length = xferlen;
1411 gl->offset = sgoffset;
1412 gl->pages[0] = sgpage;
1413
1414 for (i = 1, sg = sg_next(sgl), j = 0; i < sgcnt;
1415 i++, sg = sg_next(sg)) {
1416 struct page *page = sg_page(sg);
1417
1418 if (sgpage == page && sg->offset == sgoffset + sglen)
1419 sglen += sg->length;
1420 else {
1421 /* make sure the sgl is fit for ddp:
1422 * each has the same page size, and
1423 * all of the middle pages are used completely
1424 */
1425 if ((j && sgoffset) || ((i != sgcnt - 1) &&
1426 ((sglen + sgoffset) & ~PAGE_MASK))) {
1427 log_debug(1 << CXGBI_DBG_DDP,
1428 "page %d/%u, %u + %u.\n",
1429 i, sgcnt, sgoffset, sglen);
1430 goto error_out;
1431 }
1432
1433 j++;
1434 if (j == gl->nelem || sg->offset) {
1435 log_debug(1 << CXGBI_DBG_DDP,
1436 "page %d/%u, offset %u.\n",
1437 j, gl->nelem, sg->offset);
1438 goto error_out;
1439 }
1440 gl->pages[j] = page;
1441 sglen = sg->length;
1442 sgoffset = sg->offset;
1443 sgpage = page;
1444 }
1445 }
1446 gl->nelem = ++j;
1447
1448 if (ddp_gl_map(pdev, gl) < 0)
1449 goto error_out;
1450
1451 return gl;
1452
1453error_out:
1454 kfree(gl);
1455 return NULL;
1456}
1457
1458static void ddp_tag_release(struct cxgbi_hba *chba, u32 tag)
1459{
1460 struct cxgbi_device *cdev = chba->cdev;
1461 struct cxgbi_ddp_info *ddp = cdev->ddp;
1462 u32 idx;
1463
1464 idx = (tag >> PPOD_IDX_SHIFT) & ddp->idx_mask;
1465 if (idx < ddp->nppods) {
1466 struct cxgbi_gather_list *gl = ddp->gl_map[idx];
1467 unsigned int npods;
1468
1469 if (!gl || !gl->nelem) {
1470 pr_warn("tag 0x%x, idx %u, gl 0x%p, %u.\n",
1471 tag, idx, gl, gl ? gl->nelem : 0);
1472 return;
1473 }
1474 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1475 log_debug(1 << CXGBI_DBG_DDP,
1476 "tag 0x%x, release idx %u, npods %u.\n",
1477 tag, idx, npods);
1478 cdev->csk_ddp_clear(chba, tag, idx, npods);
1479 ddp_unmark_entries(ddp, idx, npods);
1480 ddp_release_gl(gl, ddp->pdev);
1481 } else
1482 pr_warn("tag 0x%x, idx %u > max %u.\n", tag, idx, ddp->nppods);
1483}
1484
1485static int ddp_tag_reserve(struct cxgbi_sock *csk, unsigned int tid,
1486 u32 sw_tag, u32 *tagp, struct cxgbi_gather_list *gl,
1487 gfp_t gfp)
1488{
1489 struct cxgbi_device *cdev = csk->cdev;
1490 struct cxgbi_ddp_info *ddp = cdev->ddp;
1491 struct cxgbi_tag_format *tformat = &cdev->tag_format;
1492 struct cxgbi_pagepod_hdr hdr;
1493 unsigned int npods;
1494 int idx = -1;
1495 int err = -ENOMEM;
1496 u32 tag;
1497
1498 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1499 if (ddp->idx_last == ddp->nppods)
1500 idx = ddp_find_unused_entries(ddp, 0, ddp->nppods,
1501 npods, gl);
1502 else {
1503 idx = ddp_find_unused_entries(ddp, ddp->idx_last + 1,
1504 ddp->nppods, npods,
1505 gl);
1506 if (idx < 0 && ddp->idx_last >= npods) {
1507 idx = ddp_find_unused_entries(ddp, 0,
1508 min(ddp->idx_last + npods, ddp->nppods),
1509 npods, gl);
1510 }
1511 }
1512 if (idx < 0) {
1513 log_debug(1 << CXGBI_DBG_DDP,
1514 "xferlen %u, gl %u, npods %u NO DDP.\n",
1515 gl->length, gl->nelem, npods);
1516 return idx;
1517 }
1518
9ba682f0 1519 tag = cxgbi_ddp_tag_base(tformat, sw_tag);
1520 tag |= idx << PPOD_IDX_SHIFT;
1521
1522 hdr.rsvd = 0;
1523 hdr.vld_tid = htonl(PPOD_VALID_FLAG | PPOD_TID(tid));
1524 hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask);
1525 hdr.max_offset = htonl(gl->length);
1526 hdr.page_offset = htonl(gl->offset);
1527
1528 err = cdev->csk_ddp_set(csk, &hdr, idx, npods, gl);
b8ce8b59 1529 if (err < 0)
9ba682f0 1530 goto unmark_entries;
9ba682f0 1531
1532 ddp->idx_last = idx;
1533 log_debug(1 << CXGBI_DBG_DDP,
1534 "xfer %u, gl %u,%u, tid 0x%x, tag 0x%x->0x%x(%u,%u).\n",
1535 gl->length, gl->nelem, gl->offset, tid, sw_tag, tag, idx,
1536 npods);
1537 *tagp = tag;
1538 return 0;
1539
1540unmark_entries:
1541 ddp_unmark_entries(ddp, idx, npods);
1542 return err;
1543}
1544
1545int cxgbi_ddp_reserve(struct cxgbi_sock *csk, unsigned int *tagp,
1546 unsigned int sw_tag, unsigned int xferlen,
1547 struct scatterlist *sgl, unsigned int sgcnt, gfp_t gfp)
1548{
1549 struct cxgbi_device *cdev = csk->cdev;
1550 struct cxgbi_tag_format *tformat = &cdev->tag_format;
1551 struct cxgbi_gather_list *gl;
1552 int err;
1553
1554 if (page_idx >= DDP_PGIDX_MAX || !cdev->ddp ||
1555 xferlen < DDP_THRESHOLD) {
1556 log_debug(1 << CXGBI_DBG_DDP,
1557 "pgidx %u, xfer %u, NO ddp.\n", page_idx, xferlen);
1558 return -EINVAL;
1559 }
1560
1561 if (!cxgbi_sw_tag_usable(tformat, sw_tag)) {
1562 log_debug(1 << CXGBI_DBG_DDP,
1563 "sw_tag 0x%x NOT usable.\n", sw_tag);
1564 return -EINVAL;
1565 }
1566
1567 gl = ddp_make_gl(xferlen, sgl, sgcnt, cdev->pdev, gfp);
1568 if (!gl)
1569 return -ENOMEM;
1570
1571 err = ddp_tag_reserve(csk, csk->tid, sw_tag, tagp, gl, gfp);
1572 if (err < 0)
1573 ddp_release_gl(gl, cdev->pdev);
1574
1575 return err;
1576}
1577
1578static void ddp_destroy(struct kref *kref)
1579{
1580 struct cxgbi_ddp_info *ddp = container_of(kref,
1581 struct cxgbi_ddp_info,
1582 refcnt);
1583 struct cxgbi_device *cdev = ddp->cdev;
1584 int i = 0;
1585
1586 pr_info("kref 0, destroy ddp 0x%p, cdev 0x%p.\n", ddp, cdev);
1587
1588 while (i < ddp->nppods) {
1589 struct cxgbi_gather_list *gl = ddp->gl_map[i];
1590
1591 if (gl) {
1592 int npods = (gl->nelem + PPOD_PAGES_MAX - 1)
1593 >> PPOD_PAGES_SHIFT;
1594 pr_info("cdev 0x%p, ddp %d + %d.\n", cdev, i, npods);
1595 kfree(gl);
9ba682f0 1596 i += npods;
1597 } else
1598 i++;
1599 }
1600 cxgbi_free_big_mem(ddp);
1601}
1602
1603int cxgbi_ddp_cleanup(struct cxgbi_device *cdev)
1604{
1605 struct cxgbi_ddp_info *ddp = cdev->ddp;
1606
1607 log_debug(1 << CXGBI_DBG_DDP,
1608 "cdev 0x%p, release ddp 0x%p.\n", cdev, ddp);
1609 cdev->ddp = NULL;
1610 if (ddp)
1611 return kref_put(&ddp->refcnt, ddp_destroy);
1612 return 0;
1613}
1614EXPORT_SYMBOL_GPL(cxgbi_ddp_cleanup);
1615
1616int cxgbi_ddp_init(struct cxgbi_device *cdev,
1617 unsigned int llimit, unsigned int ulimit,
1618 unsigned int max_txsz, unsigned int max_rxsz)
1619{
1620 struct cxgbi_ddp_info *ddp;
1621 unsigned int ppmax, bits;
1622
1623 ppmax = (ulimit - llimit + 1) >> PPOD_SIZE_SHIFT;
1624 bits = __ilog2_u32(ppmax) + 1;
1625 if (bits > PPOD_IDX_MAX_SIZE)
1626 bits = PPOD_IDX_MAX_SIZE;
1627 ppmax = (1 << (bits - 1)) - 1;
1628
1629 ddp = cxgbi_alloc_big_mem(sizeof(struct cxgbi_ddp_info) +
1630 ppmax * (sizeof(struct cxgbi_gather_list *) +
1631 sizeof(struct sk_buff *)),
1632 GFP_KERNEL);
1633 if (!ddp) {
1634 pr_warn("cdev 0x%p, ddp ppmax %u OOM.\n", cdev, ppmax);
1635 return -ENOMEM;
1636 }
1637 ddp->gl_map = (struct cxgbi_gather_list **)(ddp + 1);
9ba682f0 1638 cdev->ddp = ddp;
1639
1640 spin_lock_init(&ddp->map_lock);
1641 kref_init(&ddp->refcnt);
1642
1643 ddp->cdev = cdev;
1644 ddp->pdev = cdev->pdev;
1645 ddp->llimit = llimit;
1646 ddp->ulimit = ulimit;
1647 ddp->max_txsz = min_t(unsigned int, max_txsz, ULP2_MAX_PKT_SIZE);
1648 ddp->max_rxsz = min_t(unsigned int, max_rxsz, ULP2_MAX_PKT_SIZE);
1649 ddp->nppods = ppmax;
1650 ddp->idx_last = ppmax;
1651 ddp->idx_bits = bits;
1652 ddp->idx_mask = (1 << bits) - 1;
1653 ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1;
1654
1655 cdev->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
1656 cdev->tag_format.rsvd_bits = ddp->idx_bits;
1657 cdev->tag_format.rsvd_shift = PPOD_IDX_SHIFT;
1658 cdev->tag_format.rsvd_mask = (1 << cdev->tag_format.rsvd_bits) - 1;
1659
1660 pr_info("%s tag format, sw %u, rsvd %u,%u, mask 0x%x.\n",
1661 cdev->ports[0]->name, cdev->tag_format.sw_bits,
1662 cdev->tag_format.rsvd_bits, cdev->tag_format.rsvd_shift,
1663 cdev->tag_format.rsvd_mask);
1664
1665 cdev->tx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1666 ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
1667 cdev->rx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1668 ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);
1669
1670 log_debug(1 << CXGBI_DBG_DDP,
1671 "%s max payload size: %u/%u, %u/%u.\n",
1672 cdev->ports[0]->name, cdev->tx_max_size, ddp->max_txsz,
1673 cdev->rx_max_size, ddp->max_rxsz);
1674 return 0;
1675}
1676EXPORT_SYMBOL_GPL(cxgbi_ddp_init);
1677
1678/*
1679 * APIs interacting with open-iscsi libraries
1680 */
1681
1682static unsigned char padding[4];
1683
1684static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1685{
1686 struct scsi_cmnd *sc = task->sc;
1687 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1688 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1689 struct cxgbi_hba *chba = cconn->chba;
1690 struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1691 u32 tag = ntohl((__force u32)hdr_itt);
1692
1693 log_debug(1 << CXGBI_DBG_DDP,
1694 "cdev 0x%p, release tag 0x%x.\n", chba->cdev, tag);
1695 if (sc &&
1696 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
1697 cxgbi_is_ddp_tag(tformat, tag))
1698 ddp_tag_release(chba, tag);
1699}
1700
1701static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1702{
1703 struct scsi_cmnd *sc = task->sc;
1704 struct iscsi_conn *conn = task->conn;
1705 struct iscsi_session *sess = conn->session;
1706 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1707 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1708 struct cxgbi_hba *chba = cconn->chba;
1709 struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1710 u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
1711 u32 tag = 0;
1712 int err = -EINVAL;
1713
1714 if (sc &&
1715 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)) {
1716 err = cxgbi_ddp_reserve(cconn->cep->csk, &tag, sw_tag,
1717 scsi_in(sc)->length,
1718 scsi_in(sc)->table.sgl,
1719 scsi_in(sc)->table.nents,
1720 GFP_ATOMIC);
1721 if (err < 0)
1722 log_debug(1 << CXGBI_DBG_DDP,
1723 "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1724 cconn->cep->csk, task, scsi_in(sc)->length,
1725 scsi_in(sc)->table.nents);
1726 }
1727
1728 if (err < 0)
1729 tag = cxgbi_set_non_ddp_tag(tformat, sw_tag);
1730 /* the itt need to sent in big-endian order */
1731 *hdr_itt = (__force itt_t)htonl(tag);
1732
1733 log_debug(1 << CXGBI_DBG_DDP,
1734 "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1735 chba->cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1736 return 0;
1737}
1738
1739void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1740{
1741 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1742 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1743 struct cxgbi_device *cdev = cconn->chba->cdev;
1744 u32 tag = ntohl((__force u32) itt);
1745 u32 sw_bits;
1746
1747 sw_bits = cxgbi_tag_nonrsvd_bits(&cdev->tag_format, tag);
1748 if (idx)
1749 *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
1750 if (age)
1751 *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
1752
1753 log_debug(1 << CXGBI_DBG_DDP,
1754 "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1755 cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1756 age ? *age : 0xFF);
1757}
1758EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1759
1760void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1761{
1762 struct iscsi_conn *conn = csk->user_data;
1763
1764 if (conn) {
1765 log_debug(1 << CXGBI_DBG_SOCK,
1766 "csk 0x%p, cid %d.\n", csk, conn->id);
1767 iscsi_conn_queue_work(conn);
1768 }
1769}
1770EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1771
1772/*
1773 * pdu receive, interact with libiscsi_tcp
1774 */
1775static inline int read_pdu_skb(struct iscsi_conn *conn,
1776 struct sk_buff *skb,
1777 unsigned int offset,
1778 int offloaded)
1779{
1780 int status = 0;
1781 int bytes_read;
1782
1783 bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1784 switch (status) {
1785 case ISCSI_TCP_CONN_ERR:
1786 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1787 skb, offset, offloaded);
1788 return -EIO;
1789 case ISCSI_TCP_SUSPENDED:
1790 log_debug(1 << CXGBI_DBG_PDU_RX,
1791 "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1792 skb, offset, offloaded, bytes_read);
1793 /* no transfer - just have caller flush queue */
1794 return bytes_read;
1795 case ISCSI_TCP_SKB_DONE:
1796 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1797 skb, offset, offloaded);
1798 /*
1799 * pdus should always fit in the skb and we should get
1800 * segment done notifcation.
1801 */
1802 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1803 return -EFAULT;
1804 case ISCSI_TCP_SEGMENT_DONE:
1805 log_debug(1 << CXGBI_DBG_PDU_RX,
1806 "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1807 skb, offset, offloaded, bytes_read);
1808 return bytes_read;
1809 default:
1810 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1811 skb, offset, offloaded, status);
1812 return -EINVAL;
1813 }
1814}
1815
1816static int skb_read_pdu_bhs(struct iscsi_conn *conn, struct sk_buff *skb)
1817{
1818 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1819
1820 log_debug(1 << CXGBI_DBG_PDU_RX,
1821 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1822 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1823
1824 if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1825 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1826 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1827 return -EIO;
1828 }
1829
1830 if (conn->hdrdgst_en &&
1831 cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1832 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1833 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1834 return -EIO;
1835 }
1836
1837 return read_pdu_skb(conn, skb, 0, 0);
1838}
1839
1840static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1841 struct sk_buff *skb, unsigned int offset)
1842{
1843 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1844 bool offloaded = 0;
1845 int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1846
1847 log_debug(1 << CXGBI_DBG_PDU_RX,
1848 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1849 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1850
1851 if (conn->datadgst_en &&
1852 cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1853 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1854 conn, lskb, cxgbi_skcb_flags(lskb));
1855 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1856 return -EIO;
1857 }
1858
1859 if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1860 return 0;
1861
1862 /* coalesced, add header digest length */
1863 if (lskb == skb && conn->hdrdgst_en)
1864 offset += ISCSI_DIGEST_SIZE;
1865
1866 if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1867 offloaded = 1;
1868
1869 if (opcode == ISCSI_OP_SCSI_DATA_IN)
1870 log_debug(1 << CXGBI_DBG_PDU_RX,
1871 "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1872 skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1873 tcp_conn->in.datalen, offloaded ? "is" : "not");
1874
1875 return read_pdu_skb(conn, skb, offset, offloaded);
1876}
1877
1878static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1879{
1880 struct cxgbi_device *cdev = csk->cdev;
1881 int must_send;
1882 u32 credits;
1883
1884 log_debug(1 << CXGBI_DBG_PDU_RX,
fc385045 1885 "csk 0x%p,%u,0x%lx,%u, seq %u, wup %u, thre %u, %u.\n",
9ba682f0 1886 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1887 csk->rcv_wup, cdev->rx_credit_thres,
81daf10c 1888 csk->rcv_win);
9ba682f0 1889
1890 if (csk->state != CTP_ESTABLISHED)
1891 return;
1892
1893 credits = csk->copied_seq - csk->rcv_wup;
1894 if (unlikely(!credits))
1895 return;
1896 if (unlikely(cdev->rx_credit_thres == 0))
1897 return;
1898
81daf10c 1899 must_send = credits + 16384 >= csk->rcv_win;
9ba682f0 1900 if (must_send || credits >= cdev->rx_credit_thres)
1901 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1902}
1903
1904void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1905{
1906 struct cxgbi_device *cdev = csk->cdev;
1907 struct iscsi_conn *conn = csk->user_data;
1908 struct sk_buff *skb;
1909 unsigned int read = 0;
1910 int err = 0;
1911
1912 log_debug(1 << CXGBI_DBG_PDU_RX,
1913 "csk 0x%p, conn 0x%p.\n", csk, conn);
1914
1915 if (unlikely(!conn || conn->suspend_rx)) {
1916 log_debug(1 << CXGBI_DBG_PDU_RX,
1917 "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1918 csk, conn, conn ? conn->id : 0xFF,
1919 conn ? conn->suspend_rx : 0xFF);
9ba682f0 1920 return;
1921 }
1922
1923 while (!err) {
9ba682f0 1924 skb = skb_peek(&csk->receive_queue);
1925 if (!skb ||
1926 !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1927 if (skb)
1928 log_debug(1 << CXGBI_DBG_PDU_RX,
1929 "skb 0x%p, NOT ready 0x%lx.\n",
1930 skb, cxgbi_skcb_flags(skb));
9ba682f0 1931 break;
1932 }
1933 __skb_unlink(skb, &csk->receive_queue);
9ba682f0 1934
1935 read += cxgbi_skcb_rx_pdulen(skb);
1936 log_debug(1 << CXGBI_DBG_PDU_RX,
1937 "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1938 csk, skb, skb->len, cxgbi_skcb_flags(skb),
1939 cxgbi_skcb_rx_pdulen(skb));
1940
1941 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1942 err = skb_read_pdu_bhs(conn, skb);
e3d2ad8c 1943 if (err < 0) {
1944 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1945 "f 0x%lx, plen %u.\n",
1946 csk, skb, skb->len,
1947 cxgbi_skcb_flags(skb),
1948 cxgbi_skcb_rx_pdulen(skb));
1949 goto skb_done;
1950 }
9ba682f0 1951 err = skb_read_pdu_data(conn, skb, skb,
1952 err + cdev->skb_rx_extra);
e3d2ad8c 1953 if (err < 0)
1954 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1955 "f 0x%lx, plen %u.\n",
1956 csk, skb, skb->len,
1957 cxgbi_skcb_flags(skb),
1958 cxgbi_skcb_rx_pdulen(skb));
9ba682f0 1959 } else {
1960 err = skb_read_pdu_bhs(conn, skb);
e3d2ad8c 1961 if (err < 0) {
1962 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1963 "f 0x%lx, plen %u.\n",
1964 csk, skb, skb->len,
1965 cxgbi_skcb_flags(skb),
1966 cxgbi_skcb_rx_pdulen(skb));
1967 goto skb_done;
1968 }
1969
9ba682f0 1970 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1971 struct sk_buff *dskb;
1972
9ba682f0 1973 dskb = skb_peek(&csk->receive_queue);
1974 if (!dskb) {
e3d2ad8c 1975 pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1976 " plen %u, NO data.\n",
1977 csk, skb, skb->len,
1978 cxgbi_skcb_flags(skb),
1979 cxgbi_skcb_rx_pdulen(skb));
1980 err = -EIO;
1981 goto skb_done;
9ba682f0 1982 }
1983 __skb_unlink(dskb, &csk->receive_queue);
9ba682f0 1984
1985 err = skb_read_pdu_data(conn, skb, dskb, 0);
e3d2ad8c 1986 if (err < 0)
1987 pr_err("data, csk 0x%p, skb 0x%p,%u, "
1988 "f 0x%lx, plen %u, dskb 0x%p,"
1989 "%u.\n",
1990 csk, skb, skb->len,
1991 cxgbi_skcb_flags(skb),
1992 cxgbi_skcb_rx_pdulen(skb),
1993 dskb, dskb->len);
9ba682f0 1994 __kfree_skb(dskb);
1995 } else
1996 err = skb_read_pdu_data(conn, skb, skb, 0);
1997 }
e3d2ad8c 1998skb_done:
1999 __kfree_skb(skb);
2000
9ba682f0 2001 if (err < 0)
2002 break;
9ba682f0 2003 }
2004
2005 log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
2006 if (read) {
2007 csk->copied_seq += read;
2008 csk_return_rx_credits(csk, read);
2009 conn->rxdata_octets += read;
2010 }
2011
2012 if (err < 0) {
e3d2ad8c 2013 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
2014 csk, conn, err, read);
9ba682f0 2015 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
2016 }
2017}
2018EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
2019
2020static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
2021 unsigned int offset, unsigned int *off,
2022 struct scatterlist **sgp)
2023{
2024 int i;
2025 struct scatterlist *sg;
2026
2027 for_each_sg(sgl, sg, sgcnt, i) {
2028 if (offset < sg->length) {
2029 *off = offset;
2030 *sgp = sg;
2031 return 0;
2032 }
2033 offset -= sg->length;
2034 }
2035 return -EFAULT;
2036}
2037
2038static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
6a39a16a 2039 unsigned int dlen, struct page_frag *frags,
9ba682f0 2040 int frag_max)
2041{
2042 unsigned int datalen = dlen;
2043 unsigned int sglen = sg->length - sgoffset;
2044 struct page *page = sg_page(sg);
2045 int i;
2046
2047 i = 0;
2048 do {
2049 unsigned int copy;
2050
2051 if (!sglen) {
2052 sg = sg_next(sg);
2053 if (!sg) {
2054 pr_warn("sg %d NULL, len %u/%u.\n",
2055 i, datalen, dlen);
2056 return -EINVAL;
2057 }
2058 sgoffset = 0;
2059 sglen = sg->length;
2060 page = sg_page(sg);
2061
2062 }
2063 copy = min(datalen, sglen);
2064 if (i && page == frags[i - 1].page &&
2065 sgoffset + sg->offset ==
6a39a16a
IC		 2066 frags[i - 1].offset + frags[i - 1].size) {
2067 frags[i - 1].size += copy;
9ba682f0 2068 } else {
2069 if (i >= frag_max) {
2070 pr_warn("too many pages %u, dlen %u.\n",
2071 frag_max, dlen);
2072 return -EINVAL;
2073 }
2074
2075 frags[i].page = page;
6a39a16a
IC		 2076 frags[i].offset = sg->offset + sgoffset;
2077 frags[i].size = copy;
9ba682f0 2078 i++;
2079 }
2080 datalen -= copy;
2081 sgoffset += copy;
2082 sglen -= copy;
2083 } while (datalen);
2084
2085 return i;
2086}
2087
2088int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
2089{
2090 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2091 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2092 struct cxgbi_device *cdev = cconn->chba->cdev;
2093 struct iscsi_conn *conn = task->conn;
2094 struct iscsi_tcp_task *tcp_task = task->dd_data;
e3d2ad8c 2095 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
9ba682f0 2096 struct scsi_cmnd *sc = task->sc;
2097 int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
2098
2099 tcp_task->dd_data = tdata;
2100 task->hdr = NULL;
2101
2102 if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
2103 (opcode == ISCSI_OP_SCSI_DATA_OUT ||
2104 (opcode == ISCSI_OP_SCSI_CMD &&
2105 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
2106 /* data could goes into skb head */
2107 headroom += min_t(unsigned int,
2108 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
2109 conn->max_xmit_dlength);
2110
2111 tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
2112 if (!tdata->skb) {
00c4a09b
TLSC		 2113 struct cxgbi_sock *csk = cconn->cep->csk;
2114 struct net_device *ndev = cdev->ports[csk->port_id];
2115 ndev->stats.tx_dropped++;
9ba682f0 2116 return -ENOMEM;
2117 }
2118
2119 skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
2120 task->hdr = (struct iscsi_hdr *)tdata->skb->data;
2121 task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
2122
2123 /* data_out uses scsi_cmd's itt */
2124 if (opcode != ISCSI_OP_SCSI_DATA_OUT)
2125 task_reserve_itt(task, &task->hdr->itt);
2126
2127 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2128 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
2129 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
2130 conn->max_xmit_dlength, ntohl(task->hdr->itt));
2131
2132 return 0;
2133}
2134EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
2135
2136static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
2137{
c343a01c 2138 if (hcrc || dcrc) {
2139 u8 submode = 0;
9ba682f0 2140
c343a01c 2141 if (hcrc)
2142 submode |= 1;
2143 if (dcrc)
2144 submode |= 2;
2145 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
2146 } else
2147 cxgbi_skcb_ulp_mode(skb) = 0;
9ba682f0 2148}
2149
2150int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
2151 unsigned int count)
2152{
2153 struct iscsi_conn *conn = task->conn;
e3d2ad8c 2154 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
9ba682f0 2155 struct sk_buff *skb = tdata->skb;
2156 unsigned int datalen = count;
2157 int i, padlen = iscsi_padding(count);
2158 struct page *pg;
2159
2160 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2161 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
2162 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
2163 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
2164
2165 skb_put(skb, task->hdr_len);
2166 tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
2167 if (!count)
2168 return 0;
2169
2170 if (task->sc) {
2171 struct scsi_data_buffer *sdb = scsi_out(task->sc);
2172 struct scatterlist *sg = NULL;
2173 int err;
2174
2175 tdata->offset = offset;
2176 tdata->count = count;
2177 err = sgl_seek_offset(
2178 sdb->table.sgl, sdb->table.nents,
2179 tdata->offset, &tdata->sgoffset, &sg);
2180 if (err < 0) {
2181 pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
2182 sdb->table.nents, tdata->offset, sdb->length);
2183 return err;
2184 }
2185 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
2186 tdata->frags, MAX_PDU_FRAGS);
2187 if (err < 0) {
2188 pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
2189 sdb->table.nents, tdata->offset, tdata->count);
2190 return err;
2191 }
2192 tdata->nr_frags = err;
2193
2194 if (tdata->nr_frags > MAX_SKB_FRAGS ||
2195 (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
2196 char *dst = skb->data + task->hdr_len;
6a39a16a 2197 struct page_frag *frag = tdata->frags;
9ba682f0 2198
2199 /* data fits in the skb's headroom */
2200 for (i = 0; i < tdata->nr_frags; i++, frag++) {
77dfce07 2201 char *src = kmap_atomic(frag->page);
9ba682f0 2202
6a39a16a
IC		 2203 memcpy(dst, src+frag->offset, frag->size);
2204 dst += frag->size;
77dfce07 2205 kunmap_atomic(src);
9ba682f0 2206 }
2207 if (padlen) {
2208 memset(dst, 0, padlen);
2209 padlen = 0;
2210 }
2211 skb_put(skb, count + padlen);
2212 } else {
2213 /* data fit into frag_list */
6a39a16a
IC		 2214 for (i = 0; i < tdata->nr_frags; i++) {
2215 __skb_fill_page_desc(skb, i,
2216 tdata->frags[i].page,
2217 tdata->frags[i].offset,
2218 tdata->frags[i].size);
2219 skb_frag_ref(skb, i);
2220 }
9ba682f0 2221 skb_shinfo(skb)->nr_frags = tdata->nr_frags;
2222 skb->len += count;
2223 skb->data_len += count;
2224 skb->truesize += count;
2225 }
2226
2227 } else {
2228 pg = virt_to_page(task->data);
2229
2230 get_page(pg);
2231 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
2232 count);
2233 skb->len += count;
2234 skb->data_len += count;
2235 skb->truesize += count;
2236 }
2237
2238 if (padlen) {
2239 i = skb_shinfo(skb)->nr_frags;
2240 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
2241 virt_to_page(padding), offset_in_page(padding),
2242 padlen);
2243
2244 skb->data_len += padlen;
2245 skb->truesize += padlen;
2246 skb->len += padlen;
2247 }
2248
2249 return 0;
2250}
2251EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
2252
2253int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2254{
2255 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2256 struct cxgbi_conn *cconn = tcp_conn->dd_data;
e3d2ad8c 2257 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
9ba682f0 2258 struct sk_buff *skb = tdata->skb;
2259 unsigned int datalen;
2260 int err;
2261
2262 if (!skb) {
2263 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2264 "task 0x%p, skb NULL.\n", task);
2265 return 0;
2266 }
2267
2268 datalen = skb->data_len;
2269 tdata->skb = NULL;
2270 err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2271 if (err > 0) {
2272 int pdulen = err;
2273
2274 log_debug(1 << CXGBI_DBG_PDU_TX,
2275 "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2276 task, task->sc, skb, skb->len, skb->data_len, err);
2277
2278 if (task->conn->hdrdgst_en)
2279 pdulen += ISCSI_DIGEST_SIZE;
2280
2281 if (datalen && task->conn->datadgst_en)
2282 pdulen += ISCSI_DIGEST_SIZE;
2283
2284 task->conn->txdata_octets += pdulen;
2285 return 0;
2286 }
2287
2288 if (err == -EAGAIN || err == -ENOBUFS) {
2289 log_debug(1 << CXGBI_DBG_PDU_TX,
2290 "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2291 task, skb, skb->len, skb->data_len, err);
2292 /* reset skb to send when we are called again */
2293 tdata->skb = skb;
2294 return err;
2295 }
2296
9ba682f0 2297 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2298 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2299 task->itt, skb, skb->len, skb->data_len, err);
ed481a33
KX		 2300
2301 kfree_skb(skb);
2302
9ba682f0 2303 iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2304 iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2305 return err;
2306}
2307EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2308
2309void cxgbi_cleanup_task(struct iscsi_task *task)
2310{
e3d2ad8c 2311 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
9ba682f0 2312
2313 log_debug(1 << CXGBI_DBG_ISCSI,
2314 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2315 task, tdata->skb, task->hdr_itt);
2316
2317 /* never reached the xmit task callout */
2318 if (tdata->skb)
2319 __kfree_skb(tdata->skb);
2320 memset(tdata, 0, sizeof(*tdata));
2321
2322 task_release_itt(task, task->hdr_itt);
2323 iscsi_tcp_cleanup_task(task);
2324}
2325EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2326
2327void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2328 struct iscsi_stats *stats)
2329{
2330 struct iscsi_conn *conn = cls_conn->dd_data;
2331
2332 stats->txdata_octets = conn->txdata_octets;
2333 stats->rxdata_octets = conn->rxdata_octets;
2334 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2335 stats->dataout_pdus = conn->dataout_pdus_cnt;
2336 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2337 stats->datain_pdus = conn->datain_pdus_cnt;
2338 stats->r2t_pdus = conn->r2t_pdus_cnt;
2339 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2340 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2341 stats->digest_err = 0;
2342 stats->timeout_err = 0;
2343 stats->custom_length = 1;
2344 strcpy(stats->custom[0].desc, "eh_abort_cnt");
2345 stats->custom[0].value = conn->eh_abort_cnt;
2346}
2347EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2348
2349static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2350{
2351 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2352 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2353 struct cxgbi_device *cdev = cconn->chba->cdev;
2354 unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2355 unsigned int max_def = 512 * MAX_SKB_FRAGS;
2356 unsigned int max = max(max_def, headroom);
2357
2358 max = min(cconn->chba->cdev->tx_max_size, max);
2359 if (conn->max_xmit_dlength)
2360 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2361 else
2362 conn->max_xmit_dlength = max;
2363 cxgbi_align_pdu_size(conn->max_xmit_dlength);
2364
2365 return 0;
2366}
2367
2368static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2369{
2370 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2371 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2372 unsigned int max = cconn->chba->cdev->rx_max_size;
2373
2374 cxgbi_align_pdu_size(max);
2375
2376 if (conn->max_recv_dlength) {
2377 if (conn->max_recv_dlength > max) {
2378 pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2379 conn->max_recv_dlength, max);
2380 return -EINVAL;
2381 }
2382 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2383 cxgbi_align_pdu_size(conn->max_recv_dlength);
2384 } else
2385 conn->max_recv_dlength = max;
2386
2387 return 0;
2388}
2389
2390int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2391 enum iscsi_param param, char *buf, int buflen)
2392{
2393 struct iscsi_conn *conn = cls_conn->dd_data;
9ba682f0 2394 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2395 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2396 struct cxgbi_sock *csk = cconn->cep->csk;
1304be5f 2397 int err;
9ba682f0 2398
2399 log_debug(1 << CXGBI_DBG_ISCSI,
2400 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2401 cls_conn, param, buflen, buf);
2402
2403 switch (param) {
2404 case ISCSI_PARAM_HDRDGST_EN:
2405 err = iscsi_set_param(cls_conn, param, buf, buflen);
2406 if (!err && conn->hdrdgst_en)
2407 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2408 conn->hdrdgst_en,
2409 conn->datadgst_en, 0);
2410 break;
2411 case ISCSI_PARAM_DATADGST_EN:
2412 err = iscsi_set_param(cls_conn, param, buf, buflen);
2413 if (!err && conn->datadgst_en)
2414 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2415 conn->hdrdgst_en,
2416 conn->datadgst_en, 0);
2417 break;
2418 case ISCSI_PARAM_MAX_R2T:
1304be5f 2419 return iscsi_tcp_set_max_r2t(conn, buf);
9ba682f0 2420 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2421 err = iscsi_set_param(cls_conn, param, buf, buflen);
2422 if (!err)
2423 err = cxgbi_conn_max_recv_dlength(conn);
2424 break;
2425 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2426 err = iscsi_set_param(cls_conn, param, buf, buflen);
2427 if (!err)
2428 err = cxgbi_conn_max_xmit_dlength(conn);
2429 break;
2430 default:
2431 return iscsi_set_param(cls_conn, param, buf, buflen);
2432 }
2433 return err;
2434}
2435EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2436
fc8d0590
AB		 2437static inline int csk_print_port(struct cxgbi_sock *csk, char *buf)
2438{
2439 int len;
2440
2441 cxgbi_sock_get(csk);
2442 len = sprintf(buf, "%hu\n", ntohs(csk->daddr.sin_port));
2443 cxgbi_sock_put(csk);
2444
2445 return len;
2446}
2447
2448static inline int csk_print_ip(struct cxgbi_sock *csk, char *buf)
2449{
2450 int len;
2451
2452 cxgbi_sock_get(csk);
2453 if (csk->csk_family == AF_INET)
2454 len = sprintf(buf, "%pI4",
2455 &csk->daddr.sin_addr.s_addr);
2456 else
2457 len = sprintf(buf, "%pI6",
2458 &csk->daddr6.sin6_addr);
2459
2460 cxgbi_sock_put(csk);
2461
2462 return len;
2463}
2464
c71b9b66
MC		 2465int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2466 char *buf)
9ba682f0 2467{
c71b9b66
MC		 2468 struct cxgbi_endpoint *cep = ep->dd_data;
2469 struct cxgbi_sock *csk;
9ba682f0 2470 int len;
2471
2472 log_debug(1 << CXGBI_DBG_ISCSI,
c71b9b66 2473 "cls_conn 0x%p, param %d.\n", ep, param);
9ba682f0 2474
2475 switch (param) {
2476 case ISCSI_PARAM_CONN_PORT:
9ba682f0 2477 case ISCSI_PARAM_CONN_ADDRESS:
c71b9b66
MC		 2478 if (!cep)
2479 return -ENOTCONN;
2480
2481 csk = cep->csk;
2482 if (!csk)
2483 return -ENOTCONN;
2484
2485 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2486 &csk->daddr, param, buf);
9ba682f0 2487 default:
c71b9b66 2488 return -ENOSYS;
9ba682f0 2489 }
2490 return len;
2491}
c71b9b66 2492EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
9ba682f0 2493
2494struct iscsi_cls_conn *
2495cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2496{
2497 struct iscsi_cls_conn *cls_conn;
2498 struct iscsi_conn *conn;
2499 struct iscsi_tcp_conn *tcp_conn;
2500 struct cxgbi_conn *cconn;
2501
2502 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2503 if (!cls_conn)
2504 return NULL;
2505
2506 conn = cls_conn->dd_data;
2507 tcp_conn = conn->dd_data;
2508 cconn = tcp_conn->dd_data;
2509 cconn->iconn = conn;
2510
2511 log_debug(1 << CXGBI_DBG_ISCSI,
2512 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2513 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2514
2515 return cls_conn;
2516}
2517EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2518
2519int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2520 struct iscsi_cls_conn *cls_conn,
2521 u64 transport_eph, int is_leading)
2522{
2523 struct iscsi_conn *conn = cls_conn->dd_data;
2524 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2525 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2526 struct iscsi_endpoint *ep;
2527 struct cxgbi_endpoint *cep;
2528 struct cxgbi_sock *csk;
2529 int err;
2530
2531 ep = iscsi_lookup_endpoint(transport_eph);
2532 if (!ep)
2533 return -EINVAL;
2534
2535 /* setup ddp pagesize */
2536 cep = ep->dd_data;
2537 csk = cep->csk;
2538 err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid, page_idx, 0);
2539 if (err < 0)
2540 return err;
2541
2542 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2543 if (err)
2544 return -EINVAL;
2545
2546 /* calculate the tag idx bits needed for this conn based on cmds_max */
2547 cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2548
e3d2ad8c 2549 write_lock_bh(&csk->callback_lock);
9ba682f0 2550 csk->user_data = conn;
2551 cconn->chba = cep->chba;
2552 cconn->cep = cep;
2553 cep->cconn = cconn;
e3d2ad8c 2554 write_unlock_bh(&csk->callback_lock);
9ba682f0 2555
2556 cxgbi_conn_max_xmit_dlength(conn);
2557 cxgbi_conn_max_recv_dlength(conn);
2558
9ba682f0 2559 log_debug(1 << CXGBI_DBG_ISCSI,
2560 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2561 cls_session, cls_conn, ep, cconn, csk);
2562 /* init recv engine */
2563 iscsi_tcp_hdr_recv_prep(tcp_conn);
2564
2565 return 0;
2566}
2567EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2568
2569struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2570 u16 cmds_max, u16 qdepth,
2571 u32 initial_cmdsn)
2572{
2573 struct cxgbi_endpoint *cep;
2574 struct cxgbi_hba *chba;
2575 struct Scsi_Host *shost;
2576 struct iscsi_cls_session *cls_session;
2577 struct iscsi_session *session;
2578
2579 if (!ep) {
2580 pr_err("missing endpoint.\n");
2581 return NULL;
2582 }
2583
2584 cep = ep->dd_data;
2585 chba = cep->chba;
2586 shost = chba->shost;
2587
2588 BUG_ON(chba != iscsi_host_priv(shost));
2589
2590 cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2591 cmds_max, 0,
2592 sizeof(struct iscsi_tcp_task) +
2593 sizeof(struct cxgbi_task_data),
2594 initial_cmdsn, ISCSI_MAX_TARGET);
2595 if (!cls_session)
2596 return NULL;
2597
2598 session = cls_session->dd_data;
2599 if (iscsi_tcp_r2tpool_alloc(session))
2600 goto remove_session;
2601
2602 log_debug(1 << CXGBI_DBG_ISCSI,
2603 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2604 return cls_session;
2605
2606remove_session:
2607 iscsi_session_teardown(cls_session);
2608 return NULL;
2609}
2610EXPORT_SYMBOL_GPL(cxgbi_create_session);
2611
2612void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2613{
2614 log_debug(1 << CXGBI_DBG_ISCSI,
2615 "cls sess 0x%p.\n", cls_session);
2616
2617 iscsi_tcp_r2tpool_free(cls_session->dd_data);
2618 iscsi_session_teardown(cls_session);
2619}
2620EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2621
2622int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2623 char *buf, int buflen)
2624{
2625 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2626
2627 if (!chba->ndev) {
2628 shost_printk(KERN_ERR, shost, "Could not get host param. "
2629 "netdev for host not set.\n");
2630 return -ENODEV;
2631 }
2632
2633 log_debug(1 << CXGBI_DBG_ISCSI,
2634 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2635 shost, chba, chba->ndev->name, param, buflen, buf);
2636
2637 switch (param) {
2638 case ISCSI_HOST_PARAM_IPADDRESS:
2639 {
2640 __be32 addr = in_aton(buf);
2641 log_debug(1 << CXGBI_DBG_ISCSI,
2642 "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2643 cxgbi_set_iscsi_ipv4(chba, addr);
2644 return 0;
2645 }
2646 case ISCSI_HOST_PARAM_HWADDRESS:
2647 case ISCSI_HOST_PARAM_NETDEV_NAME:
2648 return 0;
2649 default:
2650 return iscsi_host_set_param(shost, param, buf, buflen);
2651 }
2652}
2653EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2654
2655int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2656 char *buf)
2657{
2658 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2659 int len = 0;
2660
2661 if (!chba->ndev) {
2662 shost_printk(KERN_ERR, shost, "Could not get host param. "
2663 "netdev for host not set.\n");
2664 return -ENODEV;
2665 }
2666
2667 log_debug(1 << CXGBI_DBG_ISCSI,
2668 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2669 shost, chba, chba->ndev->name, param);
2670
2671 switch (param) {
2672 case ISCSI_HOST_PARAM_HWADDRESS:
2673 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2674 break;
2675 case ISCSI_HOST_PARAM_NETDEV_NAME:
2676 len = sprintf(buf, "%s\n", chba->ndev->name);
2677 break;
2678 case ISCSI_HOST_PARAM_IPADDRESS:
2679 {
dd9ad67e
AB		 2680 struct cxgbi_sock *csk = find_sock_on_port(chba->cdev,
2681 chba->port_id);
2682 if (csk) {
2683 len = sprintf(buf, "%pIS",
2684 (struct sockaddr *)&csk->saddr);
2685 }
9ba682f0 2686 log_debug(1 << CXGBI_DBG_ISCSI,
dd9ad67e 2687 "hba %s, addr %s.\n", chba->ndev->name, buf);
9ba682f0 2688 break;
2689 }
2690 default:
2691 return iscsi_host_get_param(shost, param, buf);
2692 }
2693
2694 return len;
2695}
2696EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2697
2698struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2699 struct sockaddr *dst_addr,
2700 int non_blocking)
2701{
2702 struct iscsi_endpoint *ep;
2703 struct cxgbi_endpoint *cep;
2704 struct cxgbi_hba *hba = NULL;
2705 struct cxgbi_sock *csk;
2706 int err = -EINVAL;
2707
2708 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2709 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2710 shost, non_blocking, dst_addr);
2711
2712 if (shost) {
2713 hba = iscsi_host_priv(shost);
2714 if (!hba) {
2715 pr_info("shost 0x%p, priv NULL.\n", shost);
2716 goto err_out;
2717 }
2718 }
2719
fc8d0590
AB		 2720 if (dst_addr->sa_family == AF_INET) {
2721 csk = cxgbi_check_route(dst_addr);
e81fbf6c 2722#if IS_ENABLED(CONFIG_IPV6)
fc8d0590
AB		 2723 } else if (dst_addr->sa_family == AF_INET6) {
2724 csk = cxgbi_check_route6(dst_addr);
e81fbf6c 2725#endif
fc8d0590
AB		 2726 } else {
2727 pr_info("address family 0x%x NOT supported.\n",
2728 dst_addr->sa_family);
2729 err = -EAFNOSUPPORT;
2730 return (struct iscsi_endpoint *)ERR_PTR(err);
2731 }
2732
9ba682f0 2733 if (IS_ERR(csk))
2734 return (struct iscsi_endpoint *)csk;
2735 cxgbi_sock_get(csk);
2736
2737 if (!hba)
2738 hba = csk->cdev->hbas[csk->port_id];
2739 else if (hba != csk->cdev->hbas[csk->port_id]) {
2740 pr_info("Could not connect through requested host %u"
2741 "hba 0x%p != 0x%p (%u).\n",
2742 shost->host_no, hba,
2743 csk->cdev->hbas[csk->port_id], csk->port_id);
2744 err = -ENOSPC;
2745 goto release_conn;
2746 }
2747
2748 err = sock_get_port(csk);
2749 if (err)
2750 goto release_conn;
2751
2752 cxgbi_sock_set_state(csk, CTP_CONNECTING);
2753 err = csk->cdev->csk_init_act_open(csk);
2754 if (err)
2755 goto release_conn;
2756
2757 if (cxgbi_sock_is_closing(csk)) {
2758 err = -ENOSPC;
2759 pr_info("csk 0x%p is closing.\n", csk);
2760 goto release_conn;
2761 }
2762
2763 ep = iscsi_create_endpoint(sizeof(*cep));
2764 if (!ep) {
2765 err = -ENOMEM;
2766 pr_info("iscsi alloc ep, OOM.\n");
2767 goto release_conn;
2768 }
2769
2770 cep = ep->dd_data;
2771 cep->csk = csk;
2772 cep->chba = hba;
2773
2774 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2775 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2776 ep, cep, csk, hba, hba->ndev->name);
2777 return ep;
2778
2779release_conn:
2780 cxgbi_sock_put(csk);
2781 cxgbi_sock_closed(csk);
2782err_out:
2783 return ERR_PTR(err);
2784}
2785EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2786
2787int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2788{
2789 struct cxgbi_endpoint *cep = ep->dd_data;
2790 struct cxgbi_sock *csk = cep->csk;
2791
2792 if (!cxgbi_sock_is_established(csk))
2793 return 0;
2794 return 1;
2795}
2796EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2797
2798void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2799{
2800 struct cxgbi_endpoint *cep = ep->dd_data;
2801 struct cxgbi_conn *cconn = cep->cconn;
2802 struct cxgbi_sock *csk = cep->csk;
2803
2804 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2805 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2806 ep, cep, cconn, csk, csk->state, csk->flags);
2807
2808 if (cconn && cconn->iconn) {
2809 iscsi_suspend_tx(cconn->iconn);
2810 write_lock_bh(&csk->callback_lock);
2811 cep->csk->user_data = NULL;
2812 cconn->cep = NULL;
2813 write_unlock_bh(&csk->callback_lock);
2814 }
2815 iscsi_destroy_endpoint(ep);
2816
2817 if (likely(csk->state >= CTP_ESTABLISHED))
2818 need_active_close(csk);
2819 else
2820 cxgbi_sock_closed(csk);
2821
2822 cxgbi_sock_put(csk);
2823}
2824EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2825
2826int cxgbi_iscsi_init(struct iscsi_transport *itp,
2827 struct scsi_transport_template **stt)
2828{
2829 *stt = iscsi_register_transport(itp);
2830 if (*stt == NULL) {
2831 pr_err("unable to register %s transport 0x%p.\n",
2832 itp->name, itp);
2833 return -ENODEV;
2834 }
2835 log_debug(1 << CXGBI_DBG_ISCSI,
2836 "%s, registered iscsi transport 0x%p.\n",
2837 itp->name, stt);
2838 return 0;
2839}
2840EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2841
2842void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2843 struct scsi_transport_template **stt)
2844{
2845 if (*stt) {
2846 log_debug(1 << CXGBI_DBG_ISCSI,
2847 "de-register transport 0x%p, %s, stt 0x%p.\n",
2848 itp, itp->name, *stt);
2849 *stt = NULL;
2850 iscsi_unregister_transport(itp);
2851 }
2852}
2853EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2854
587a1f16 2855umode_t cxgbi_attr_is_visible(int param_type, int param)
3128c6c7
MC		 2856{
2857 switch (param_type) {
f27fb2ef
MC		 2858 case ISCSI_HOST_PARAM:
2859 switch (param) {
2860 case ISCSI_HOST_PARAM_NETDEV_NAME:
2861 case ISCSI_HOST_PARAM_HWADDRESS:
2862 case ISCSI_HOST_PARAM_IPADDRESS:
2863 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2864 return S_IRUGO;
2865 default:
2866 return 0;
2867 }
3128c6c7
MC		 2868 case ISCSI_PARAM:
2869 switch (param) {
2870 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2871 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2872 case ISCSI_PARAM_HDRDGST_EN:
2873 case ISCSI_PARAM_DATADGST_EN:
2874 case ISCSI_PARAM_CONN_ADDRESS:
2875 case ISCSI_PARAM_CONN_PORT:
2876 case ISCSI_PARAM_EXP_STATSN:
2877 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2878 case ISCSI_PARAM_PERSISTENT_PORT:
2879 case ISCSI_PARAM_PING_TMO:
2880 case ISCSI_PARAM_RECV_TMO:
1d063c17
MC		 2881 case ISCSI_PARAM_INITIAL_R2T_EN:
2882 case ISCSI_PARAM_MAX_R2T:
2883 case ISCSI_PARAM_IMM_DATA_EN:
2884 case ISCSI_PARAM_FIRST_BURST:
2885 case ISCSI_PARAM_MAX_BURST:
2886 case ISCSI_PARAM_PDU_INORDER_EN:
2887 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2888 case ISCSI_PARAM_ERL:
2889 case ISCSI_PARAM_TARGET_NAME:
2890 case ISCSI_PARAM_TPGT:
2891 case ISCSI_PARAM_USERNAME:
2892 case ISCSI_PARAM_PASSWORD:
2893 case ISCSI_PARAM_USERNAME_IN:
2894 case ISCSI_PARAM_PASSWORD_IN:
2895 case ISCSI_PARAM_FAST_ABORT:
2896 case ISCSI_PARAM_ABORT_TMO:
2897 case ISCSI_PARAM_LU_RESET_TMO:
2898 case ISCSI_PARAM_TGT_RESET_TMO:
2899 case ISCSI_PARAM_IFACE_NAME:
2900 case ISCSI_PARAM_INITIATOR_NAME:
3128c6c7
MC		 2901 return S_IRUGO;
2902 default:
2903 return 0;
2904 }
2905 }
2906
2907 return 0;
2908}
2909EXPORT_SYMBOL_GPL(cxgbi_attr_is_visible);
2910
9ba682f0 2911static int __init libcxgbi_init_module(void)
2912{
2913 sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
2914 sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
2915
2916 pr_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
2917 ISCSI_ITT_MASK, sw_tag_idx_bits,
2918 ISCSI_AGE_MASK, sw_tag_age_bits);
2919
2920 ddp_setup_host_page_size();
2921 return 0;
2922}
2923
2924static void __exit libcxgbi_exit_module(void)
2925{
2926 cxgbi_device_unregister_all(0xFF);
2927 return;
2928}
2929
2930module_init(libcxgbi_init_module);
2931module_exit(libcxgbi_exit_module);
Linux kernel - Deliverables
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