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scsi: set REQ_QUEUE for the blk-mq case
[deliverable/linux.git] / drivers / scsi / cxgbi / libcxgbi.c
CommitLineData
9ba682f0 1/*
2 * libcxgbi.c: Chelsio common library for T3/T4 iSCSI driver.
3 *
4 * Copyright (c) 2010 Chelsio Communications, Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation.
9 *
10 * Written by: Karen Xie (kxie@chelsio.com)
11 * Written by: Rakesh Ranjan (rranjan@chelsio.com)
12 */
13
14#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
15
16#include <linux/skbuff.h>
17#include <linux/crypto.h>
18#include <linux/scatterlist.h>
19#include <linux/pci.h>
20#include <scsi/scsi.h>
21#include <scsi/scsi_cmnd.h>
22#include <scsi/scsi_host.h>
23#include <linux/if_vlan.h>
24#include <linux/inet.h>
25#include <net/dst.h>
26#include <net/route.h>
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 */
402static int sock_get_port(struct cxgbi_sock *csk)
403{
404 struct cxgbi_device *cdev = csk->cdev;
405 struct cxgbi_ports_map *pmap = &cdev->pmap;
406 unsigned int start;
407 int idx;
fc8d0590 408 __be16 *port;
9ba682f0 409
410 if (!pmap->max_connect) {
411 pr_err("cdev 0x%p, p#%u %s, NO port map.\n",
412 cdev, csk->port_id, cdev->ports[csk->port_id]->name);
413 return -EADDRNOTAVAIL;
414 }
415
fc8d0590
AB		 416 if (csk->csk_family == AF_INET)
417 port = &csk->saddr.sin_port;
418 else /* ipv6 */
419 port = &csk->saddr6.sin6_port;
420
421 if (*port) {
9ba682f0 422 pr_err("source port NON-ZERO %u.\n",
fc8d0590 423 ntohs(*port));
9ba682f0 424 return -EADDRINUSE;
425 }
426
427 spin_lock_bh(&pmap->lock);
428 if (pmap->used >= pmap->max_connect) {
429 spin_unlock_bh(&pmap->lock);
430 pr_info("cdev 0x%p, p#%u %s, ALL ports used.\n",
431 cdev, csk->port_id, cdev->ports[csk->port_id]->name);
432 return -EADDRNOTAVAIL;
433 }
434
435 start = idx = pmap->next;
436 do {
437 if (++idx >= pmap->max_connect)
438 idx = 0;
439 if (!pmap->port_csk[idx]) {
440 pmap->used++;
fc8d0590 441 *port = htons(pmap->sport_base + idx);
9ba682f0 442 pmap->next = idx;
443 pmap->port_csk[idx] = csk;
444 spin_unlock_bh(&pmap->lock);
445 cxgbi_sock_get(csk);
446 log_debug(1 << CXGBI_DBG_SOCK,
447 "cdev 0x%p, p#%u %s, p %u, %u.\n",
448 cdev, csk->port_id,
449 cdev->ports[csk->port_id]->name,
450 pmap->sport_base + idx, pmap->next);
451 return 0;
452 }
453 } while (idx != start);
454 spin_unlock_bh(&pmap->lock);
455
456 /* should not happen */
457 pr_warn("cdev 0x%p, p#%u %s, next %u?\n",
458 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
459 pmap->next);
460 return -EADDRNOTAVAIL;
461}
462
463static void sock_put_port(struct cxgbi_sock *csk)
464{
465 struct cxgbi_device *cdev = csk->cdev;
466 struct cxgbi_ports_map *pmap = &cdev->pmap;
fc8d0590 467 __be16 *port;
9ba682f0 468
fc8d0590
AB		 469 if (csk->csk_family == AF_INET)
470 port = &csk->saddr.sin_port;
471 else /* ipv6 */
472 port = &csk->saddr6.sin6_port;
9ba682f0 473
fc8d0590
AB		 474 if (*port) {
475 int idx = ntohs(*port) - pmap->sport_base;
476
477 *port = 0;
9ba682f0 478 if (idx < 0 || idx >= pmap->max_connect) {
479 pr_err("cdev 0x%p, p#%u %s, port %u OOR.\n",
480 cdev, csk->port_id,
481 cdev->ports[csk->port_id]->name,
fc8d0590 482 ntohs(*port));
9ba682f0 483 return;
484 }
485
486 spin_lock_bh(&pmap->lock);
487 pmap->port_csk[idx] = NULL;
488 pmap->used--;
489 spin_unlock_bh(&pmap->lock);
490
491 log_debug(1 << CXGBI_DBG_SOCK,
492 "cdev 0x%p, p#%u %s, release %u.\n",
493 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
494 pmap->sport_base + idx);
495
496 cxgbi_sock_put(csk);
497 }
498}
499
500/*
501 * iscsi tcp connection
502 */
503void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *csk)
504{
505 if (csk->cpl_close) {
506 kfree_skb(csk->cpl_close);
507 csk->cpl_close = NULL;
508 }
509 if (csk->cpl_abort_req) {
510 kfree_skb(csk->cpl_abort_req);
511 csk->cpl_abort_req = NULL;
512 }
513 if (csk->cpl_abort_rpl) {
514 kfree_skb(csk->cpl_abort_rpl);
515 csk->cpl_abort_rpl = NULL;
516 }
517}
518EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs);
519
520static struct cxgbi_sock *cxgbi_sock_create(struct cxgbi_device *cdev)
521{
522 struct cxgbi_sock *csk = kzalloc(sizeof(*csk), GFP_NOIO);
523
524 if (!csk) {
525 pr_info("alloc csk %zu failed.\n", sizeof(*csk));
526 return NULL;
527 }
528
529 if (cdev->csk_alloc_cpls(csk) < 0) {
530 pr_info("csk 0x%p, alloc cpls failed.\n", csk);
531 kfree(csk);
532 return NULL;
533 }
534
535 spin_lock_init(&csk->lock);
536 kref_init(&csk->refcnt);
537 skb_queue_head_init(&csk->receive_queue);
538 skb_queue_head_init(&csk->write_queue);
539 setup_timer(&csk->retry_timer, NULL, (unsigned long)csk);
540 rwlock_init(&csk->callback_lock);
541 csk->cdev = cdev;
542 csk->flags = 0;
543 cxgbi_sock_set_state(csk, CTP_CLOSED);
544
545 log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk);
546
547 return csk;
548}
549
f4bfd99f
DM		 550static struct rtable *find_route_ipv4(struct flowi4 *fl4,
551 __be32 saddr, __be32 daddr,
78fbfd8a 552 __be16 sport, __be16 dport, u8 tos)
9ba682f0 553{
554 struct rtable *rt;
9ba682f0 555
f4bfd99f 556 rt = ip_route_output_ports(&init_net, fl4, NULL, daddr, saddr,
78fbfd8a 557 dport, sport, IPPROTO_TCP, tos, 0);
b23dd4fe 558 if (IS_ERR(rt))
9ba682f0 559 return NULL;
560
561 return rt;
562}
563
564static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr)
565{
566 struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
567 struct dst_entry *dst;
568 struct net_device *ndev;
569 struct cxgbi_device *cdev;
570 struct rtable *rt = NULL;
a58b61e5 571 struct neighbour *n;
f4bfd99f 572 struct flowi4 fl4;
9ba682f0 573 struct cxgbi_sock *csk = NULL;
574 unsigned int mtu = 0;
575 int port = 0xFFFF;
576 int err = 0;
577
f4bfd99f 578 rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0, daddr->sin_port, 0);
9ba682f0 579 if (!rt) {
580 pr_info("no route to ipv4 0x%x, port %u.\n",
fc8d0590
AB		 581 be32_to_cpu(daddr->sin_addr.s_addr),
582 be16_to_cpu(daddr->sin_port));
9ba682f0 583 err = -ENETUNREACH;
584 goto err_out;
585 }
586 dst = &rt->dst;
0b399d46 587 n = dst_neigh_lookup(dst, &daddr->sin_addr.s_addr);
a58b61e5
DM		 588 if (!n) {
589 err = -ENODEV;
590 goto rel_rt;
591 }
592 ndev = n->dev;
9ba682f0 593
594 if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
595 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
596 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
597 ndev->name);
598 err = -ENETUNREACH;
0b399d46 599 goto rel_neigh;
9ba682f0 600 }
601
602 if (ndev->flags & IFF_LOOPBACK) {
603 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
604 mtu = ndev->mtu;
605 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
a58b61e5 606 n->dev->name, ndev->name, mtu);
9ba682f0 607 }
608
9ba682f0 609 cdev = cxgbi_device_find_by_netdev(ndev, &port);
610 if (!cdev) {
611 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
612 &daddr->sin_addr.s_addr, ndev->name);
613 err = -ENETUNREACH;
0b399d46 614 goto rel_neigh;
9ba682f0 615 }
616 log_debug(1 << CXGBI_DBG_SOCK,
617 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
618 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
619 port, ndev->name, cdev);
620
621 csk = cxgbi_sock_create(cdev);
622 if (!csk) {
623 err = -ENOMEM;
0b399d46 624 goto rel_neigh;
9ba682f0 625 }
626 csk->cdev = cdev;
627 csk->port_id = port;
628 csk->mtu = mtu;
629 csk->dst = dst;
fc8d0590
AB		 630
631 csk->csk_family = AF_INET;
9ba682f0 632 csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
633 csk->daddr.sin_port = daddr->sin_port;
c71b9b66 634 csk->daddr.sin_family = daddr->sin_family;
fc8d0590 635 csk->saddr.sin_family = daddr->sin_family;
f4bfd99f 636 csk->saddr.sin_addr.s_addr = fl4.saddr;
0b399d46 637 neigh_release(n);
9ba682f0 638
639 return csk;
640
0b399d46
DM		 641rel_neigh:
642 neigh_release(n);
643
9ba682f0 644rel_rt:
645 ip_rt_put(rt);
646 if (csk)
647 cxgbi_sock_closed(csk);
648err_out:
649 return ERR_PTR(err);
650}
651
e81fbf6c 652#if IS_ENABLED(CONFIG_IPV6)
fc8d0590
AB		 653static struct rt6_info *find_route_ipv6(const struct in6_addr *saddr,
654 const struct in6_addr *daddr)
655{
656 struct flowi6 fl;
657
658 if (saddr)
659 memcpy(&fl.saddr, saddr, sizeof(struct in6_addr));
660 if (daddr)
661 memcpy(&fl.daddr, daddr, sizeof(struct in6_addr));
662 return (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl);
663}
664
665static struct cxgbi_sock *cxgbi_check_route6(struct sockaddr *dst_addr)
666{
667 struct sockaddr_in6 *daddr6 = (struct sockaddr_in6 *)dst_addr;
668 struct dst_entry *dst;
669 struct net_device *ndev;
670 struct cxgbi_device *cdev;
671 struct rt6_info *rt = NULL;
672 struct neighbour *n;
673 struct in6_addr pref_saddr;
674 struct cxgbi_sock *csk = NULL;
675 unsigned int mtu = 0;
676 int port = 0xFFFF;
677 int err = 0;
678
679 rt = find_route_ipv6(NULL, &daddr6->sin6_addr);
680
681 if (!rt) {
682 pr_info("no route to ipv6 %pI6 port %u\n",
683 daddr6->sin6_addr.s6_addr,
684 be16_to_cpu(daddr6->sin6_port));
685 err = -ENETUNREACH;
686 goto err_out;
687 }
688
689 dst = &rt->dst;
690
691 n = dst_neigh_lookup(dst, &daddr6->sin6_addr);
692
693 if (!n) {
694 pr_info("%pI6, port %u, dst no neighbour.\n",
695 daddr6->sin6_addr.s6_addr,
696 be16_to_cpu(daddr6->sin6_port));
697 err = -ENETUNREACH;
698 goto rel_rt;
699 }
700 ndev = n->dev;
701
702 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
703 pr_info("multi-cast route %pI6 port %u, dev %s.\n",
704 daddr6->sin6_addr.s6_addr,
705 ntohs(daddr6->sin6_port), ndev->name);
706 err = -ENETUNREACH;
707 goto rel_rt;
708 }
709
710 cdev = cxgbi_device_find_by_netdev(ndev, &port);
711 if (!cdev)
712 cdev = cxgbi_device_find_by_mac(ndev, &port);
713 if (!cdev) {
714 pr_info("dst %pI6 %s, NOT cxgbi device.\n",
715 daddr6->sin6_addr.s6_addr, ndev->name);
716 err = -ENETUNREACH;
717 goto rel_rt;
718 }
719 log_debug(1 << CXGBI_DBG_SOCK,
720 "route to %pI6 :%u, ndev p#%d,%s, cdev 0x%p.\n",
721 daddr6->sin6_addr.s6_addr, ntohs(daddr6->sin6_port), port,
722 ndev->name, cdev);
723
724 csk = cxgbi_sock_create(cdev);
725 if (!csk) {
726 err = -ENOMEM;
727 goto rel_rt;
728 }
729 csk->cdev = cdev;
730 csk->port_id = port;
731 csk->mtu = mtu;
732 csk->dst = dst;
733
734 if (ipv6_addr_any(&rt->rt6i_prefsrc.addr)) {
735 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry *)rt);
736
737 err = ipv6_dev_get_saddr(&init_net, idev ? idev->dev : NULL,
738 &daddr6->sin6_addr, 0, &pref_saddr);
739 if (err) {
740 pr_info("failed to get source address to reach %pI6\n",
741 &daddr6->sin6_addr);
742 goto rel_rt;
743 }
744 } else {
745 pref_saddr = rt->rt6i_prefsrc.addr;
746 }
747
748 csk->csk_family = AF_INET6;
749 csk->daddr6.sin6_addr = daddr6->sin6_addr;
750 csk->daddr6.sin6_port = daddr6->sin6_port;
751 csk->daddr6.sin6_family = daddr6->sin6_family;
752 csk->saddr6.sin6_addr = pref_saddr;
753
754 neigh_release(n);
755 return csk;
756
757rel_rt:
758 if (n)
759 neigh_release(n);
760
761 ip6_rt_put(rt);
762 if (csk)
763 cxgbi_sock_closed(csk);
764err_out:
765 return ERR_PTR(err);
766}
e81fbf6c 767#endif /* IS_ENABLED(CONFIG_IPV6) */
fc8d0590 768
9ba682f0 769void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
770 unsigned int opt)
771{
772 csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
773 dst_confirm(csk->dst);
774 smp_mb();
775 cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
776}
777EXPORT_SYMBOL_GPL(cxgbi_sock_established);
778
779static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
780{
781 log_debug(1 << CXGBI_DBG_SOCK,
782 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
783 csk, csk->state, csk->flags, csk->user_data);
784
785 if (csk->state != CTP_ESTABLISHED) {
e3d2ad8c 786 read_lock_bh(&csk->callback_lock);
9ba682f0 787 if (csk->user_data)
788 iscsi_conn_failure(csk->user_data,
789 ISCSI_ERR_CONN_FAILED);
e3d2ad8c 790 read_unlock_bh(&csk->callback_lock);
9ba682f0 791 }
792}
793
794void cxgbi_sock_closed(struct cxgbi_sock *csk)
795{
796 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
797 csk, (csk)->state, (csk)->flags, (csk)->tid);
798 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
799 if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
800 return;
801 if (csk->saddr.sin_port)
802 sock_put_port(csk);
803 if (csk->dst)
804 dst_release(csk->dst);
805 csk->cdev->csk_release_offload_resources(csk);
806 cxgbi_sock_set_state(csk, CTP_CLOSED);
807 cxgbi_inform_iscsi_conn_closing(csk);
808 cxgbi_sock_put(csk);
809}
810EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
811
812static void need_active_close(struct cxgbi_sock *csk)
813{
814 int data_lost;
815 int close_req = 0;
816
817 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
818 csk, (csk)->state, (csk)->flags, (csk)->tid);
819 spin_lock_bh(&csk->lock);
820 dst_confirm(csk->dst);
821 data_lost = skb_queue_len(&csk->receive_queue);
822 __skb_queue_purge(&csk->receive_queue);
823
824 if (csk->state == CTP_ACTIVE_OPEN)
825 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
826 else if (csk->state == CTP_ESTABLISHED) {
827 close_req = 1;
828 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
829 } else if (csk->state == CTP_PASSIVE_CLOSE) {
830 close_req = 1;
831 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
832 }
833
834 if (close_req) {
835 if (data_lost)
836 csk->cdev->csk_send_abort_req(csk);
837 else
838 csk->cdev->csk_send_close_req(csk);
839 }
840
841 spin_unlock_bh(&csk->lock);
842}
843
844void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
845{
846 pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
847 csk, csk->state, csk->flags,
848 &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
849 &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
850 errno);
851
852 cxgbi_sock_set_state(csk, CTP_CONNECTING);
853 csk->err = errno;
854 cxgbi_sock_closed(csk);
855}
856EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
857
858void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
859{
860 struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
861
862 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
863 csk, (csk)->state, (csk)->flags, (csk)->tid);
864 cxgbi_sock_get(csk);
865 spin_lock_bh(&csk->lock);
866 if (csk->state == CTP_ACTIVE_OPEN)
867 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
868 spin_unlock_bh(&csk->lock);
869 cxgbi_sock_put(csk);
870 __kfree_skb(skb);
871}
872EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
873
874void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
875{
876 cxgbi_sock_get(csk);
877 spin_lock_bh(&csk->lock);
878 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
879 if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_RCVD))
880 cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
881 else {
882 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_RCVD);
883 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
884 if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
885 pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
886 csk, csk->state, csk->flags, csk->tid);
887 cxgbi_sock_closed(csk);
888 }
889 }
890 spin_unlock_bh(&csk->lock);
891 cxgbi_sock_put(csk);
892}
893EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
894
895void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
896{
897 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
898 csk, (csk)->state, (csk)->flags, (csk)->tid);
899 cxgbi_sock_get(csk);
900 spin_lock_bh(&csk->lock);
901
902 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
903 goto done;
904
905 switch (csk->state) {
906 case CTP_ESTABLISHED:
907 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
908 break;
909 case CTP_ACTIVE_CLOSE:
910 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
911 break;
912 case CTP_CLOSE_WAIT_1:
913 cxgbi_sock_closed(csk);
914 break;
915 case CTP_ABORTING:
916 break;
917 default:
918 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
919 csk, csk->state, csk->flags, csk->tid);
920 }
921 cxgbi_inform_iscsi_conn_closing(csk);
922done:
923 spin_unlock_bh(&csk->lock);
924 cxgbi_sock_put(csk);
925}
926EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
927
928void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
929{
930 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
931 csk, (csk)->state, (csk)->flags, (csk)->tid);
932 cxgbi_sock_get(csk);
933 spin_lock_bh(&csk->lock);
934
935 csk->snd_una = snd_nxt - 1;
936 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
937 goto done;
938
939 switch (csk->state) {
940 case CTP_ACTIVE_CLOSE:
941 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
942 break;
943 case CTP_CLOSE_WAIT_1:
944 case CTP_CLOSE_WAIT_2:
945 cxgbi_sock_closed(csk);
946 break;
947 case CTP_ABORTING:
948 break;
949 default:
950 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
951 csk, csk->state, csk->flags, csk->tid);
952 }
953done:
954 spin_unlock_bh(&csk->lock);
955 cxgbi_sock_put(csk);
956}
957EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
958
959void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
960 unsigned int snd_una, int seq_chk)
961{
962 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
963 "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
964 csk, csk->state, csk->flags, csk->tid, credits,
965 csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
966
967 spin_lock_bh(&csk->lock);
968
969 csk->wr_cred += credits;
970 if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
971 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
972
973 while (credits) {
974 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
975
976 if (unlikely(!p)) {
977 pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
978 csk, csk->state, csk->flags, csk->tid, credits,
979 csk->wr_cred, csk->wr_una_cred);
980 break;
981 }
982
983 if (unlikely(credits < p->csum)) {
984 pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
985 csk, csk->state, csk->flags, csk->tid,
986 credits, csk->wr_cred, csk->wr_una_cred,
987 p->csum);
988 p->csum -= credits;
989 break;
990 } else {
991 cxgbi_sock_dequeue_wr(csk);
992 credits -= p->csum;
993 kfree_skb(p);
994 }
995 }
996
997 cxgbi_sock_check_wr_invariants(csk);
998
999 if (seq_chk) {
1000 if (unlikely(before(snd_una, csk->snd_una))) {
1001 pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
1002 csk, csk->state, csk->flags, csk->tid, snd_una,
1003 csk->snd_una);
1004 goto done;
1005 }
1006
1007 if (csk->snd_una != snd_una) {
1008 csk->snd_una = snd_una;
1009 dst_confirm(csk->dst);
1010 }
1011 }
1012
1013 if (skb_queue_len(&csk->write_queue)) {
1014 if (csk->cdev->csk_push_tx_frames(csk, 0))
1015 cxgbi_conn_tx_open(csk);
1016 } else
1017 cxgbi_conn_tx_open(csk);
1018done:
1019 spin_unlock_bh(&csk->lock);
1020}
1021EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
1022
1023static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
1024 unsigned short mtu)
1025{
1026 int i = 0;
1027
1028 while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
1029 ++i;
1030
1031 return i;
1032}
1033
1034unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
1035{
1036 unsigned int idx;
1037 struct dst_entry *dst = csk->dst;
1038
0dbaee3b 1039 csk->advmss = dst_metric_advmss(dst);
9ba682f0 1040
1041 if (csk->advmss > pmtu - 40)
1042 csk->advmss = pmtu - 40;
1043 if (csk->advmss < csk->cdev->mtus[0] - 40)
1044 csk->advmss = csk->cdev->mtus[0] - 40;
1045 idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
1046
1047 return idx;
1048}
1049EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
1050
1051void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
1052{
1053 cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
1054 __skb_queue_tail(&csk->write_queue, skb);
1055}
1056EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
1057
1058void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
1059{
1060 struct sk_buff *skb;
1061
1062 while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
1063 kfree_skb(skb);
1064}
1065EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
1066
1067void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
1068{
1069 int pending = cxgbi_sock_count_pending_wrs(csk);
1070
1071 if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
1072 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
1073 csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
1074}
1075EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
1076
1077static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
1078{
1079 struct cxgbi_device *cdev = csk->cdev;
1080 struct sk_buff *next;
1081 int err, copied = 0;
1082
1083 spin_lock_bh(&csk->lock);
1084
1085 if (csk->state != CTP_ESTABLISHED) {
1086 log_debug(1 << CXGBI_DBG_PDU_TX,
1087 "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
1088 csk, csk->state, csk->flags, csk->tid);
1089 err = -EAGAIN;
1090 goto out_err;
1091 }
1092
1093 if (csk->err) {
1094 log_debug(1 << CXGBI_DBG_PDU_TX,
1095 "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
1096 csk, csk->state, csk->flags, csk->tid, csk->err);
1097 err = -EPIPE;
1098 goto out_err;
1099 }
1100
1101 if (csk->write_seq - csk->snd_una >= cdev->snd_win) {
1102 log_debug(1 << CXGBI_DBG_PDU_TX,
1103 "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
1104 csk, csk->state, csk->flags, csk->tid, csk->write_seq,
1105 csk->snd_una, cdev->snd_win);
1106 err = -ENOBUFS;
1107 goto out_err;
1108 }
1109
1110 while (skb) {
1111 int frags = skb_shinfo(skb)->nr_frags +
1112 (skb->len != skb->data_len);
1113
1114 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
1115 pr_err("csk 0x%p, skb head %u < %u.\n",
1116 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
1117 err = -EINVAL;
1118 goto out_err;
1119 }
1120
1121 if (frags >= SKB_WR_LIST_SIZE) {
1122 pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
1123 csk, skb_shinfo(skb)->nr_frags, skb->len,
1124 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
1125 err = -EINVAL;
1126 goto out_err;
1127 }
1128
1129 next = skb->next;
1130 skb->next = NULL;
1131 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
1132 cxgbi_sock_skb_entail(csk, skb);
1133 copied += skb->len;
1134 csk->write_seq += skb->len +
1135 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
1136 skb = next;
1137 }
1138done:
1139 if (likely(skb_queue_len(&csk->write_queue)))
1140 cdev->csk_push_tx_frames(csk, 1);
1141 spin_unlock_bh(&csk->lock);
1142 return copied;
1143
1144out_err:
1145 if (copied == 0 && err == -EPIPE)
1146 copied = csk->err ? csk->err : -EPIPE;
1147 else
1148 copied = err;
1149 goto done;
1150}
1151
1152/*
1153 * Direct Data Placement -
1154 * Directly place the iSCSI Data-In or Data-Out PDU's payload into pre-posted
1155 * final destination host-memory buffers based on the Initiator Task Tag (ITT)
1156 * in Data-In or Target Task Tag (TTT) in Data-Out PDUs.
1157 * The host memory address is programmed into h/w in the format of pagepod
1158 * entries.
1159 * The location of the pagepod entry is encoded into ddp tag which is used as
1160 * the base for ITT/TTT.
1161 */
1162
1163static unsigned char ddp_page_order[DDP_PGIDX_MAX] = {0, 1, 2, 4};
1164static unsigned char ddp_page_shift[DDP_PGIDX_MAX] = {12, 13, 14, 16};
1165static unsigned char page_idx = DDP_PGIDX_MAX;
1166
1167static unsigned char sw_tag_idx_bits;
1168static unsigned char sw_tag_age_bits;
1169
1170/*
1171 * Direct-Data Placement page size adjustment
1172 */
1173static int ddp_adjust_page_table(void)
1174{
1175 int i;
1176 unsigned int base_order, order;
1177
1178 if (PAGE_SIZE < (1UL << ddp_page_shift[0])) {
1179 pr_info("PAGE_SIZE 0x%lx too small, min 0x%lx\n",
1180 PAGE_SIZE, 1UL << ddp_page_shift[0]);
1181 return -EINVAL;
1182 }
1183
1184 base_order = get_order(1UL << ddp_page_shift[0]);
1185 order = get_order(1UL << PAGE_SHIFT);
1186
1187 for (i = 0; i < DDP_PGIDX_MAX; i++) {
1188 /* first is the kernel page size, then just doubling */
1189 ddp_page_order[i] = order - base_order + i;
1190 ddp_page_shift[i] = PAGE_SHIFT + i;
1191 }
1192 return 0;
1193}
1194
1195static int ddp_find_page_index(unsigned long pgsz)
1196{
1197 int i;
1198
1199 for (i = 0; i < DDP_PGIDX_MAX; i++) {
1200 if (pgsz == (1UL << ddp_page_shift[i]))
1201 return i;
1202 }
1203 pr_info("ddp page size %lu not supported.\n", pgsz);
1204 return DDP_PGIDX_MAX;
1205}
1206
1207static void ddp_setup_host_page_size(void)
1208{
1209 if (page_idx == DDP_PGIDX_MAX) {
1210 page_idx = ddp_find_page_index(PAGE_SIZE);
1211
1212 if (page_idx == DDP_PGIDX_MAX) {
1213 pr_info("system PAGE %lu, update hw.\n", PAGE_SIZE);
1214 if (ddp_adjust_page_table() < 0) {
1215 pr_info("PAGE %lu, disable ddp.\n", PAGE_SIZE);
1216 return;
1217 }
1218 page_idx = ddp_find_page_index(PAGE_SIZE);
1219 }
1220 pr_info("system PAGE %lu, ddp idx %u.\n", PAGE_SIZE, page_idx);
1221 }
1222}
1223
1224void cxgbi_ddp_page_size_factor(int *pgsz_factor)
1225{
1226 int i;
1227
1228 for (i = 0; i < DDP_PGIDX_MAX; i++)
1229 pgsz_factor[i] = ddp_page_order[i];
1230}
1231EXPORT_SYMBOL_GPL(cxgbi_ddp_page_size_factor);
1232
1233/*
1234 * DDP setup & teardown
1235 */
1236
1237void cxgbi_ddp_ppod_set(struct cxgbi_pagepod *ppod,
1238 struct cxgbi_pagepod_hdr *hdr,
1239 struct cxgbi_gather_list *gl, unsigned int gidx)
1240{
1241 int i;
1242
1243 memcpy(ppod, hdr, sizeof(*hdr));
1244 for (i = 0; i < (PPOD_PAGES_MAX + 1); i++, gidx++) {
1245 ppod->addr[i] = gidx < gl->nelem ?
1246 cpu_to_be64(gl->phys_addr[gidx]) : 0ULL;
1247 }
1248}
1249EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_set);
1250
1251void cxgbi_ddp_ppod_clear(struct cxgbi_pagepod *ppod)
1252{
1253 memset(ppod, 0, sizeof(*ppod));
1254}
1255EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_clear);
1256
1257static inline int ddp_find_unused_entries(struct cxgbi_ddp_info *ddp,
1258 unsigned int start, unsigned int max,
1259 unsigned int count,
1260 struct cxgbi_gather_list *gl)
1261{
1262 unsigned int i, j, k;
1263
1264 /* not enough entries */
1265 if ((max - start) < count) {
1266 log_debug(1 << CXGBI_DBG_DDP,
1267 "NOT enough entries %u+%u < %u.\n", start, count, max);
1268 return -EBUSY;
1269 }
1270
1271 max -= count;
1272 spin_lock(&ddp->map_lock);
1273 for (i = start; i < max;) {
1274 for (j = 0, k = i; j < count; j++, k++) {
1275 if (ddp->gl_map[k])
1276 break;
1277 }
1278 if (j == count) {
1279 for (j = 0, k = i; j < count; j++, k++)
1280 ddp->gl_map[k] = gl;
1281 spin_unlock(&ddp->map_lock);
1282 return i;
1283 }
1284 i += j + 1;
1285 }
1286 spin_unlock(&ddp->map_lock);
1287 log_debug(1 << CXGBI_DBG_DDP,
1288 "NO suitable entries %u available.\n", count);
1289 return -EBUSY;
1290}
1291
1292static inline void ddp_unmark_entries(struct cxgbi_ddp_info *ddp,
1293 int start, int count)
1294{
1295 spin_lock(&ddp->map_lock);
1296 memset(&ddp->gl_map[start], 0,
1297 count * sizeof(struct cxgbi_gather_list *));
1298 spin_unlock(&ddp->map_lock);
1299}
1300
1301static inline void ddp_gl_unmap(struct pci_dev *pdev,
1302 struct cxgbi_gather_list *gl)
1303{
1304 int i;
1305
1306 for (i = 0; i < gl->nelem; i++)
1307 dma_unmap_page(&pdev->dev, gl->phys_addr[i], PAGE_SIZE,
1308 PCI_DMA_FROMDEVICE);
1309}
1310
1311static inline int ddp_gl_map(struct pci_dev *pdev,
1312 struct cxgbi_gather_list *gl)
1313{
1314 int i;
1315
1316 for (i = 0; i < gl->nelem; i++) {
1317 gl->phys_addr[i] = dma_map_page(&pdev->dev, gl->pages[i], 0,
1318 PAGE_SIZE,
1319 PCI_DMA_FROMDEVICE);
1320 if (unlikely(dma_mapping_error(&pdev->dev, gl->phys_addr[i]))) {
1321 log_debug(1 << CXGBI_DBG_DDP,
1322 "page %d 0x%p, 0x%p dma mapping err.\n",
1323 i, gl->pages[i], pdev);
1324 goto unmap;
1325 }
1326 }
1327 return i;
1328unmap:
1329 if (i) {
1330 unsigned int nelem = gl->nelem;
1331
1332 gl->nelem = i;
1333 ddp_gl_unmap(pdev, gl);
1334 gl->nelem = nelem;
1335 }
1336 return -EINVAL;
1337}
1338
1339static void ddp_release_gl(struct cxgbi_gather_list *gl,
1340 struct pci_dev *pdev)
1341{
1342 ddp_gl_unmap(pdev, gl);
1343 kfree(gl);
1344}
1345
1346static struct cxgbi_gather_list *ddp_make_gl(unsigned int xferlen,
1347 struct scatterlist *sgl,
1348 unsigned int sgcnt,
1349 struct pci_dev *pdev,
1350 gfp_t gfp)
1351{
1352 struct cxgbi_gather_list *gl;
1353 struct scatterlist *sg = sgl;
1354 struct page *sgpage = sg_page(sg);
1355 unsigned int sglen = sg->length;
1356 unsigned int sgoffset = sg->offset;
1357 unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >>
1358 PAGE_SHIFT;
1359 int i = 1, j = 0;
1360
1361 if (xferlen < DDP_THRESHOLD) {
1362 log_debug(1 << CXGBI_DBG_DDP,
1363 "xfer %u < threshold %u, no ddp.\n",
1364 xferlen, DDP_THRESHOLD);
1365 return NULL;
1366 }
1367
1368 gl = kzalloc(sizeof(struct cxgbi_gather_list) +
1369 npages * (sizeof(dma_addr_t) +
1370 sizeof(struct page *)), gfp);
1371 if (!gl) {
1372 log_debug(1 << CXGBI_DBG_DDP,
1373 "xfer %u, %u pages, OOM.\n", xferlen, npages);
1374 return NULL;
1375 }
1376
1377 log_debug(1 << CXGBI_DBG_DDP,
1378 "xfer %u, sgl %u, gl max %u.\n", xferlen, sgcnt, npages);
1379
1380 gl->pages = (struct page **)&gl->phys_addr[npages];
1381 gl->nelem = npages;
1382 gl->length = xferlen;
1383 gl->offset = sgoffset;
1384 gl->pages[0] = sgpage;
1385
1386 for (i = 1, sg = sg_next(sgl), j = 0; i < sgcnt;
1387 i++, sg = sg_next(sg)) {
1388 struct page *page = sg_page(sg);
1389
1390 if (sgpage == page && sg->offset == sgoffset + sglen)
1391 sglen += sg->length;
1392 else {
1393 /* make sure the sgl is fit for ddp:
1394 * each has the same page size, and
1395 * all of the middle pages are used completely
1396 */
1397 if ((j && sgoffset) || ((i != sgcnt - 1) &&
1398 ((sglen + sgoffset) & ~PAGE_MASK))) {
1399 log_debug(1 << CXGBI_DBG_DDP,
1400 "page %d/%u, %u + %u.\n",
1401 i, sgcnt, sgoffset, sglen);
1402 goto error_out;
1403 }
1404
1405 j++;
1406 if (j == gl->nelem || sg->offset) {
1407 log_debug(1 << CXGBI_DBG_DDP,
1408 "page %d/%u, offset %u.\n",
1409 j, gl->nelem, sg->offset);
1410 goto error_out;
1411 }
1412 gl->pages[j] = page;
1413 sglen = sg->length;
1414 sgoffset = sg->offset;
1415 sgpage = page;
1416 }
1417 }
1418 gl->nelem = ++j;
1419
1420 if (ddp_gl_map(pdev, gl) < 0)
1421 goto error_out;
1422
1423 return gl;
1424
1425error_out:
1426 kfree(gl);
1427 return NULL;
1428}
1429
1430static void ddp_tag_release(struct cxgbi_hba *chba, u32 tag)
1431{
1432 struct cxgbi_device *cdev = chba->cdev;
1433 struct cxgbi_ddp_info *ddp = cdev->ddp;
1434 u32 idx;
1435
1436 idx = (tag >> PPOD_IDX_SHIFT) & ddp->idx_mask;
1437 if (idx < ddp->nppods) {
1438 struct cxgbi_gather_list *gl = ddp->gl_map[idx];
1439 unsigned int npods;
1440
1441 if (!gl || !gl->nelem) {
1442 pr_warn("tag 0x%x, idx %u, gl 0x%p, %u.\n",
1443 tag, idx, gl, gl ? gl->nelem : 0);
1444 return;
1445 }
1446 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1447 log_debug(1 << CXGBI_DBG_DDP,
1448 "tag 0x%x, release idx %u, npods %u.\n",
1449 tag, idx, npods);
1450 cdev->csk_ddp_clear(chba, tag, idx, npods);
1451 ddp_unmark_entries(ddp, idx, npods);
1452 ddp_release_gl(gl, ddp->pdev);
1453 } else
1454 pr_warn("tag 0x%x, idx %u > max %u.\n", tag, idx, ddp->nppods);
1455}
1456
1457static int ddp_tag_reserve(struct cxgbi_sock *csk, unsigned int tid,
1458 u32 sw_tag, u32 *tagp, struct cxgbi_gather_list *gl,
1459 gfp_t gfp)
1460{
1461 struct cxgbi_device *cdev = csk->cdev;
1462 struct cxgbi_ddp_info *ddp = cdev->ddp;
1463 struct cxgbi_tag_format *tformat = &cdev->tag_format;
1464 struct cxgbi_pagepod_hdr hdr;
1465 unsigned int npods;
1466 int idx = -1;
1467 int err = -ENOMEM;
1468 u32 tag;
1469
1470 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1471 if (ddp->idx_last == ddp->nppods)
1472 idx = ddp_find_unused_entries(ddp, 0, ddp->nppods,
1473 npods, gl);
1474 else {
1475 idx = ddp_find_unused_entries(ddp, ddp->idx_last + 1,
1476 ddp->nppods, npods,
1477 gl);
1478 if (idx < 0 && ddp->idx_last >= npods) {
1479 idx = ddp_find_unused_entries(ddp, 0,
1480 min(ddp->idx_last + npods, ddp->nppods),
1481 npods, gl);
1482 }
1483 }
1484 if (idx < 0) {
1485 log_debug(1 << CXGBI_DBG_DDP,
1486 "xferlen %u, gl %u, npods %u NO DDP.\n",
1487 gl->length, gl->nelem, npods);
1488 return idx;
1489 }
1490
9ba682f0 1491 tag = cxgbi_ddp_tag_base(tformat, sw_tag);
1492 tag |= idx << PPOD_IDX_SHIFT;
1493
1494 hdr.rsvd = 0;
1495 hdr.vld_tid = htonl(PPOD_VALID_FLAG | PPOD_TID(tid));
1496 hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask);
1497 hdr.max_offset = htonl(gl->length);
1498 hdr.page_offset = htonl(gl->offset);
1499
1500 err = cdev->csk_ddp_set(csk, &hdr, idx, npods, gl);
b8ce8b59 1501 if (err < 0)
9ba682f0 1502 goto unmark_entries;
9ba682f0 1503
1504 ddp->idx_last = idx;
1505 log_debug(1 << CXGBI_DBG_DDP,
1506 "xfer %u, gl %u,%u, tid 0x%x, tag 0x%x->0x%x(%u,%u).\n",
1507 gl->length, gl->nelem, gl->offset, tid, sw_tag, tag, idx,
1508 npods);
1509 *tagp = tag;
1510 return 0;
1511
1512unmark_entries:
1513 ddp_unmark_entries(ddp, idx, npods);
1514 return err;
1515}
1516
1517int cxgbi_ddp_reserve(struct cxgbi_sock *csk, unsigned int *tagp,
1518 unsigned int sw_tag, unsigned int xferlen,
1519 struct scatterlist *sgl, unsigned int sgcnt, gfp_t gfp)
1520{
1521 struct cxgbi_device *cdev = csk->cdev;
1522 struct cxgbi_tag_format *tformat = &cdev->tag_format;
1523 struct cxgbi_gather_list *gl;
1524 int err;
1525
1526 if (page_idx >= DDP_PGIDX_MAX || !cdev->ddp ||
1527 xferlen < DDP_THRESHOLD) {
1528 log_debug(1 << CXGBI_DBG_DDP,
1529 "pgidx %u, xfer %u, NO ddp.\n", page_idx, xferlen);
1530 return -EINVAL;
1531 }
1532
1533 if (!cxgbi_sw_tag_usable(tformat, sw_tag)) {
1534 log_debug(1 << CXGBI_DBG_DDP,
1535 "sw_tag 0x%x NOT usable.\n", sw_tag);
1536 return -EINVAL;
1537 }
1538
1539 gl = ddp_make_gl(xferlen, sgl, sgcnt, cdev->pdev, gfp);
1540 if (!gl)
1541 return -ENOMEM;
1542
1543 err = ddp_tag_reserve(csk, csk->tid, sw_tag, tagp, gl, gfp);
1544 if (err < 0)
1545 ddp_release_gl(gl, cdev->pdev);
1546
1547 return err;
1548}
1549
1550static void ddp_destroy(struct kref *kref)
1551{
1552 struct cxgbi_ddp_info *ddp = container_of(kref,
1553 struct cxgbi_ddp_info,
1554 refcnt);
1555 struct cxgbi_device *cdev = ddp->cdev;
1556 int i = 0;
1557
1558 pr_info("kref 0, destroy ddp 0x%p, cdev 0x%p.\n", ddp, cdev);
1559
1560 while (i < ddp->nppods) {
1561 struct cxgbi_gather_list *gl = ddp->gl_map[i];
1562
1563 if (gl) {
1564 int npods = (gl->nelem + PPOD_PAGES_MAX - 1)
1565 >> PPOD_PAGES_SHIFT;
1566 pr_info("cdev 0x%p, ddp %d + %d.\n", cdev, i, npods);
1567 kfree(gl);
9ba682f0 1568 i += npods;
1569 } else
1570 i++;
1571 }
1572 cxgbi_free_big_mem(ddp);
1573}
1574
1575int cxgbi_ddp_cleanup(struct cxgbi_device *cdev)
1576{
1577 struct cxgbi_ddp_info *ddp = cdev->ddp;
1578
1579 log_debug(1 << CXGBI_DBG_DDP,
1580 "cdev 0x%p, release ddp 0x%p.\n", cdev, ddp);
1581 cdev->ddp = NULL;
1582 if (ddp)
1583 return kref_put(&ddp->refcnt, ddp_destroy);
1584 return 0;
1585}
1586EXPORT_SYMBOL_GPL(cxgbi_ddp_cleanup);
1587
1588int cxgbi_ddp_init(struct cxgbi_device *cdev,
1589 unsigned int llimit, unsigned int ulimit,
1590 unsigned int max_txsz, unsigned int max_rxsz)
1591{
1592 struct cxgbi_ddp_info *ddp;
1593 unsigned int ppmax, bits;
1594
1595 ppmax = (ulimit - llimit + 1) >> PPOD_SIZE_SHIFT;
1596 bits = __ilog2_u32(ppmax) + 1;
1597 if (bits > PPOD_IDX_MAX_SIZE)
1598 bits = PPOD_IDX_MAX_SIZE;
1599 ppmax = (1 << (bits - 1)) - 1;
1600
1601 ddp = cxgbi_alloc_big_mem(sizeof(struct cxgbi_ddp_info) +
1602 ppmax * (sizeof(struct cxgbi_gather_list *) +
1603 sizeof(struct sk_buff *)),
1604 GFP_KERNEL);
1605 if (!ddp) {
1606 pr_warn("cdev 0x%p, ddp ppmax %u OOM.\n", cdev, ppmax);
1607 return -ENOMEM;
1608 }
1609 ddp->gl_map = (struct cxgbi_gather_list **)(ddp + 1);
9ba682f0 1610 cdev->ddp = ddp;
1611
1612 spin_lock_init(&ddp->map_lock);
1613 kref_init(&ddp->refcnt);
1614
1615 ddp->cdev = cdev;
1616 ddp->pdev = cdev->pdev;
1617 ddp->llimit = llimit;
1618 ddp->ulimit = ulimit;
1619 ddp->max_txsz = min_t(unsigned int, max_txsz, ULP2_MAX_PKT_SIZE);
1620 ddp->max_rxsz = min_t(unsigned int, max_rxsz, ULP2_MAX_PKT_SIZE);
1621 ddp->nppods = ppmax;
1622 ddp->idx_last = ppmax;
1623 ddp->idx_bits = bits;
1624 ddp->idx_mask = (1 << bits) - 1;
1625 ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1;
1626
1627 cdev->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
1628 cdev->tag_format.rsvd_bits = ddp->idx_bits;
1629 cdev->tag_format.rsvd_shift = PPOD_IDX_SHIFT;
1630 cdev->tag_format.rsvd_mask = (1 << cdev->tag_format.rsvd_bits) - 1;
1631
1632 pr_info("%s tag format, sw %u, rsvd %u,%u, mask 0x%x.\n",
1633 cdev->ports[0]->name, cdev->tag_format.sw_bits,
1634 cdev->tag_format.rsvd_bits, cdev->tag_format.rsvd_shift,
1635 cdev->tag_format.rsvd_mask);
1636
1637 cdev->tx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1638 ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
1639 cdev->rx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1640 ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);
1641
1642 log_debug(1 << CXGBI_DBG_DDP,
1643 "%s max payload size: %u/%u, %u/%u.\n",
1644 cdev->ports[0]->name, cdev->tx_max_size, ddp->max_txsz,
1645 cdev->rx_max_size, ddp->max_rxsz);
1646 return 0;
1647}
1648EXPORT_SYMBOL_GPL(cxgbi_ddp_init);
1649
1650/*
1651 * APIs interacting with open-iscsi libraries
1652 */
1653
1654static unsigned char padding[4];
1655
1656static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1657{
1658 struct scsi_cmnd *sc = task->sc;
1659 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1660 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1661 struct cxgbi_hba *chba = cconn->chba;
1662 struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1663 u32 tag = ntohl((__force u32)hdr_itt);
1664
1665 log_debug(1 << CXGBI_DBG_DDP,
1666 "cdev 0x%p, release tag 0x%x.\n", chba->cdev, tag);
1667 if (sc &&
1668 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
1669 cxgbi_is_ddp_tag(tformat, tag))
1670 ddp_tag_release(chba, tag);
1671}
1672
1673static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1674{
1675 struct scsi_cmnd *sc = task->sc;
1676 struct iscsi_conn *conn = task->conn;
1677 struct iscsi_session *sess = conn->session;
1678 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1679 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1680 struct cxgbi_hba *chba = cconn->chba;
1681 struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1682 u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
1683 u32 tag = 0;
1684 int err = -EINVAL;
1685
1686 if (sc &&
1687 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)) {
1688 err = cxgbi_ddp_reserve(cconn->cep->csk, &tag, sw_tag,
1689 scsi_in(sc)->length,
1690 scsi_in(sc)->table.sgl,
1691 scsi_in(sc)->table.nents,
1692 GFP_ATOMIC);
1693 if (err < 0)
1694 log_debug(1 << CXGBI_DBG_DDP,
1695 "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1696 cconn->cep->csk, task, scsi_in(sc)->length,
1697 scsi_in(sc)->table.nents);
1698 }
1699
1700 if (err < 0)
1701 tag = cxgbi_set_non_ddp_tag(tformat, sw_tag);
1702 /* the itt need to sent in big-endian order */
1703 *hdr_itt = (__force itt_t)htonl(tag);
1704
1705 log_debug(1 << CXGBI_DBG_DDP,
1706 "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1707 chba->cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1708 return 0;
1709}
1710
1711void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1712{
1713 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1714 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1715 struct cxgbi_device *cdev = cconn->chba->cdev;
1716 u32 tag = ntohl((__force u32) itt);
1717 u32 sw_bits;
1718
1719 sw_bits = cxgbi_tag_nonrsvd_bits(&cdev->tag_format, tag);
1720 if (idx)
1721 *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
1722 if (age)
1723 *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
1724
1725 log_debug(1 << CXGBI_DBG_DDP,
1726 "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1727 cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1728 age ? *age : 0xFF);
1729}
1730EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1731
1732void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1733{
1734 struct iscsi_conn *conn = csk->user_data;
1735
1736 if (conn) {
1737 log_debug(1 << CXGBI_DBG_SOCK,
1738 "csk 0x%p, cid %d.\n", csk, conn->id);
1739 iscsi_conn_queue_work(conn);
1740 }
1741}
1742EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1743
1744/*
1745 * pdu receive, interact with libiscsi_tcp
1746 */
1747static inline int read_pdu_skb(struct iscsi_conn *conn,
1748 struct sk_buff *skb,
1749 unsigned int offset,
1750 int offloaded)
1751{
1752 int status = 0;
1753 int bytes_read;
1754
1755 bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1756 switch (status) {
1757 case ISCSI_TCP_CONN_ERR:
1758 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1759 skb, offset, offloaded);
1760 return -EIO;
1761 case ISCSI_TCP_SUSPENDED:
1762 log_debug(1 << CXGBI_DBG_PDU_RX,
1763 "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1764 skb, offset, offloaded, bytes_read);
1765 /* no transfer - just have caller flush queue */
1766 return bytes_read;
1767 case ISCSI_TCP_SKB_DONE:
1768 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1769 skb, offset, offloaded);
1770 /*
1771 * pdus should always fit in the skb and we should get
1772 * segment done notifcation.
1773 */
1774 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1775 return -EFAULT;
1776 case ISCSI_TCP_SEGMENT_DONE:
1777 log_debug(1 << CXGBI_DBG_PDU_RX,
1778 "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1779 skb, offset, offloaded, bytes_read);
1780 return bytes_read;
1781 default:
1782 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1783 skb, offset, offloaded, status);
1784 return -EINVAL;
1785 }
1786}
1787
1788static int skb_read_pdu_bhs(struct iscsi_conn *conn, struct sk_buff *skb)
1789{
1790 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1791
1792 log_debug(1 << CXGBI_DBG_PDU_RX,
1793 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1794 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1795
1796 if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1797 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1798 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1799 return -EIO;
1800 }
1801
1802 if (conn->hdrdgst_en &&
1803 cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1804 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1805 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1806 return -EIO;
1807 }
1808
1809 return read_pdu_skb(conn, skb, 0, 0);
1810}
1811
1812static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1813 struct sk_buff *skb, unsigned int offset)
1814{
1815 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1816 bool offloaded = 0;
1817 int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1818
1819 log_debug(1 << CXGBI_DBG_PDU_RX,
1820 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1821 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1822
1823 if (conn->datadgst_en &&
1824 cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1825 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1826 conn, lskb, cxgbi_skcb_flags(lskb));
1827 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1828 return -EIO;
1829 }
1830
1831 if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1832 return 0;
1833
1834 /* coalesced, add header digest length */
1835 if (lskb == skb && conn->hdrdgst_en)
1836 offset += ISCSI_DIGEST_SIZE;
1837
1838 if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1839 offloaded = 1;
1840
1841 if (opcode == ISCSI_OP_SCSI_DATA_IN)
1842 log_debug(1 << CXGBI_DBG_PDU_RX,
1843 "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1844 skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1845 tcp_conn->in.datalen, offloaded ? "is" : "not");
1846
1847 return read_pdu_skb(conn, skb, offset, offloaded);
1848}
1849
1850static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1851{
1852 struct cxgbi_device *cdev = csk->cdev;
1853 int must_send;
1854 u32 credits;
1855
1856 log_debug(1 << CXGBI_DBG_PDU_RX,
fc385045 1857 "csk 0x%p,%u,0x%lx,%u, seq %u, wup %u, thre %u, %u.\n",
9ba682f0 1858 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1859 csk->rcv_wup, cdev->rx_credit_thres,
1860 cdev->rcv_win);
1861
1862 if (csk->state != CTP_ESTABLISHED)
1863 return;
1864
1865 credits = csk->copied_seq - csk->rcv_wup;
1866 if (unlikely(!credits))
1867 return;
1868 if (unlikely(cdev->rx_credit_thres == 0))
1869 return;
1870
1871 must_send = credits + 16384 >= cdev->rcv_win;
1872 if (must_send || credits >= cdev->rx_credit_thres)
1873 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1874}
1875
1876void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1877{
1878 struct cxgbi_device *cdev = csk->cdev;
1879 struct iscsi_conn *conn = csk->user_data;
1880 struct sk_buff *skb;
1881 unsigned int read = 0;
1882 int err = 0;
1883
1884 log_debug(1 << CXGBI_DBG_PDU_RX,
1885 "csk 0x%p, conn 0x%p.\n", csk, conn);
1886
1887 if (unlikely(!conn || conn->suspend_rx)) {
1888 log_debug(1 << CXGBI_DBG_PDU_RX,
1889 "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1890 csk, conn, conn ? conn->id : 0xFF,
1891 conn ? conn->suspend_rx : 0xFF);
9ba682f0 1892 return;
1893 }
1894
1895 while (!err) {
9ba682f0 1896 skb = skb_peek(&csk->receive_queue);
1897 if (!skb ||
1898 !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1899 if (skb)
1900 log_debug(1 << CXGBI_DBG_PDU_RX,
1901 "skb 0x%p, NOT ready 0x%lx.\n",
1902 skb, cxgbi_skcb_flags(skb));
9ba682f0 1903 break;
1904 }
1905 __skb_unlink(skb, &csk->receive_queue);
9ba682f0 1906
1907 read += cxgbi_skcb_rx_pdulen(skb);
1908 log_debug(1 << CXGBI_DBG_PDU_RX,
1909 "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1910 csk, skb, skb->len, cxgbi_skcb_flags(skb),
1911 cxgbi_skcb_rx_pdulen(skb));
1912
1913 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1914 err = skb_read_pdu_bhs(conn, skb);
e3d2ad8c 1915 if (err < 0) {
1916 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1917 "f 0x%lx, plen %u.\n",
1918 csk, skb, skb->len,
1919 cxgbi_skcb_flags(skb),
1920 cxgbi_skcb_rx_pdulen(skb));
1921 goto skb_done;
1922 }
9ba682f0 1923 err = skb_read_pdu_data(conn, skb, skb,
1924 err + cdev->skb_rx_extra);
e3d2ad8c 1925 if (err < 0)
1926 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1927 "f 0x%lx, plen %u.\n",
1928 csk, skb, skb->len,
1929 cxgbi_skcb_flags(skb),
1930 cxgbi_skcb_rx_pdulen(skb));
9ba682f0 1931 } else {
1932 err = skb_read_pdu_bhs(conn, skb);
e3d2ad8c 1933 if (err < 0) {
1934 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1935 "f 0x%lx, plen %u.\n",
1936 csk, skb, skb->len,
1937 cxgbi_skcb_flags(skb),
1938 cxgbi_skcb_rx_pdulen(skb));
1939 goto skb_done;
1940 }
1941
9ba682f0 1942 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1943 struct sk_buff *dskb;
1944
9ba682f0 1945 dskb = skb_peek(&csk->receive_queue);
1946 if (!dskb) {
e3d2ad8c 1947 pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1948 " plen %u, NO data.\n",
1949 csk, skb, skb->len,
1950 cxgbi_skcb_flags(skb),
1951 cxgbi_skcb_rx_pdulen(skb));
1952 err = -EIO;
1953 goto skb_done;
9ba682f0 1954 }
1955 __skb_unlink(dskb, &csk->receive_queue);
9ba682f0 1956
1957 err = skb_read_pdu_data(conn, skb, dskb, 0);
e3d2ad8c 1958 if (err < 0)
1959 pr_err("data, csk 0x%p, skb 0x%p,%u, "
1960 "f 0x%lx, plen %u, dskb 0x%p,"
1961 "%u.\n",
1962 csk, skb, skb->len,
1963 cxgbi_skcb_flags(skb),
1964 cxgbi_skcb_rx_pdulen(skb),
1965 dskb, dskb->len);
9ba682f0 1966 __kfree_skb(dskb);
1967 } else
1968 err = skb_read_pdu_data(conn, skb, skb, 0);
1969 }
e3d2ad8c 1970skb_done:
1971 __kfree_skb(skb);
1972
9ba682f0 1973 if (err < 0)
1974 break;
9ba682f0 1975 }
1976
1977 log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
1978 if (read) {
1979 csk->copied_seq += read;
1980 csk_return_rx_credits(csk, read);
1981 conn->rxdata_octets += read;
1982 }
1983
1984 if (err < 0) {
e3d2ad8c 1985 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
1986 csk, conn, err, read);
9ba682f0 1987 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1988 }
1989}
1990EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
1991
1992static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
1993 unsigned int offset, unsigned int *off,
1994 struct scatterlist **sgp)
1995{
1996 int i;
1997 struct scatterlist *sg;
1998
1999 for_each_sg(sgl, sg, sgcnt, i) {
2000 if (offset < sg->length) {
2001 *off = offset;
2002 *sgp = sg;
2003 return 0;
2004 }
2005 offset -= sg->length;
2006 }
2007 return -EFAULT;
2008}
2009
2010static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
6a39a16a 2011 unsigned int dlen, struct page_frag *frags,
9ba682f0 2012 int frag_max)
2013{
2014 unsigned int datalen = dlen;
2015 unsigned int sglen = sg->length - sgoffset;
2016 struct page *page = sg_page(sg);
2017 int i;
2018
2019 i = 0;
2020 do {
2021 unsigned int copy;
2022
2023 if (!sglen) {
2024 sg = sg_next(sg);
2025 if (!sg) {
2026 pr_warn("sg %d NULL, len %u/%u.\n",
2027 i, datalen, dlen);
2028 return -EINVAL;
2029 }
2030 sgoffset = 0;
2031 sglen = sg->length;
2032 page = sg_page(sg);
2033
2034 }
2035 copy = min(datalen, sglen);
2036 if (i && page == frags[i - 1].page &&
2037 sgoffset + sg->offset ==
6a39a16a
IC		 2038 frags[i - 1].offset + frags[i - 1].size) {
2039 frags[i - 1].size += copy;
9ba682f0 2040 } else {
2041 if (i >= frag_max) {
2042 pr_warn("too many pages %u, dlen %u.\n",
2043 frag_max, dlen);
2044 return -EINVAL;
2045 }
2046
2047 frags[i].page = page;
6a39a16a
IC		 2048 frags[i].offset = sg->offset + sgoffset;
2049 frags[i].size = copy;
9ba682f0 2050 i++;
2051 }
2052 datalen -= copy;
2053 sgoffset += copy;
2054 sglen -= copy;
2055 } while (datalen);
2056
2057 return i;
2058}
2059
2060int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
2061{
2062 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2063 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2064 struct cxgbi_device *cdev = cconn->chba->cdev;
2065 struct iscsi_conn *conn = task->conn;
2066 struct iscsi_tcp_task *tcp_task = task->dd_data;
e3d2ad8c 2067 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
9ba682f0 2068 struct scsi_cmnd *sc = task->sc;
2069 int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
2070
2071 tcp_task->dd_data = tdata;
2072 task->hdr = NULL;
2073
2074 if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
2075 (opcode == ISCSI_OP_SCSI_DATA_OUT ||
2076 (opcode == ISCSI_OP_SCSI_CMD &&
2077 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
2078 /* data could goes into skb head */
2079 headroom += min_t(unsigned int,
2080 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
2081 conn->max_xmit_dlength);
2082
2083 tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
2084 if (!tdata->skb) {
00c4a09b
TLSC		 2085 struct cxgbi_sock *csk = cconn->cep->csk;
2086 struct net_device *ndev = cdev->ports[csk->port_id];
2087 ndev->stats.tx_dropped++;
9ba682f0 2088 return -ENOMEM;
2089 }
2090
2091 skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
2092 task->hdr = (struct iscsi_hdr *)tdata->skb->data;
2093 task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
2094
2095 /* data_out uses scsi_cmd's itt */
2096 if (opcode != ISCSI_OP_SCSI_DATA_OUT)
2097 task_reserve_itt(task, &task->hdr->itt);
2098
2099 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2100 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
2101 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
2102 conn->max_xmit_dlength, ntohl(task->hdr->itt));
2103
2104 return 0;
2105}
2106EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
2107
2108static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
2109{
c343a01c 2110 if (hcrc || dcrc) {
2111 u8 submode = 0;
9ba682f0 2112
c343a01c 2113 if (hcrc)
2114 submode |= 1;
2115 if (dcrc)
2116 submode |= 2;
2117 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
2118 } else
2119 cxgbi_skcb_ulp_mode(skb) = 0;
9ba682f0 2120}
2121
2122int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
2123 unsigned int count)
2124{
2125 struct iscsi_conn *conn = task->conn;
e3d2ad8c 2126 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
9ba682f0 2127 struct sk_buff *skb = tdata->skb;
2128 unsigned int datalen = count;
2129 int i, padlen = iscsi_padding(count);
2130 struct page *pg;
2131
2132 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2133 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
2134 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
2135 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
2136
2137 skb_put(skb, task->hdr_len);
2138 tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
2139 if (!count)
2140 return 0;
2141
2142 if (task->sc) {
2143 struct scsi_data_buffer *sdb = scsi_out(task->sc);
2144 struct scatterlist *sg = NULL;
2145 int err;
2146
2147 tdata->offset = offset;
2148 tdata->count = count;
2149 err = sgl_seek_offset(
2150 sdb->table.sgl, sdb->table.nents,
2151 tdata->offset, &tdata->sgoffset, &sg);
2152 if (err < 0) {
2153 pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
2154 sdb->table.nents, tdata->offset, sdb->length);
2155 return err;
2156 }
2157 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
2158 tdata->frags, MAX_PDU_FRAGS);
2159 if (err < 0) {
2160 pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
2161 sdb->table.nents, tdata->offset, tdata->count);
2162 return err;
2163 }
2164 tdata->nr_frags = err;
2165
2166 if (tdata->nr_frags > MAX_SKB_FRAGS ||
2167 (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
2168 char *dst = skb->data + task->hdr_len;
6a39a16a 2169 struct page_frag *frag = tdata->frags;
9ba682f0 2170
2171 /* data fits in the skb's headroom */
2172 for (i = 0; i < tdata->nr_frags; i++, frag++) {
77dfce07 2173 char *src = kmap_atomic(frag->page);
9ba682f0 2174
6a39a16a
IC		 2175 memcpy(dst, src+frag->offset, frag->size);
2176 dst += frag->size;
77dfce07 2177 kunmap_atomic(src);
9ba682f0 2178 }
2179 if (padlen) {
2180 memset(dst, 0, padlen);
2181 padlen = 0;
2182 }
2183 skb_put(skb, count + padlen);
2184 } else {
2185 /* data fit into frag_list */
6a39a16a
IC		 2186 for (i = 0; i < tdata->nr_frags; i++) {
2187 __skb_fill_page_desc(skb, i,
2188 tdata->frags[i].page,
2189 tdata->frags[i].offset,
2190 tdata->frags[i].size);
2191 skb_frag_ref(skb, i);
2192 }
9ba682f0 2193 skb_shinfo(skb)->nr_frags = tdata->nr_frags;
2194 skb->len += count;
2195 skb->data_len += count;
2196 skb->truesize += count;
2197 }
2198
2199 } else {
2200 pg = virt_to_page(task->data);
2201
2202 get_page(pg);
2203 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
2204 count);
2205 skb->len += count;
2206 skb->data_len += count;
2207 skb->truesize += count;
2208 }
2209
2210 if (padlen) {
2211 i = skb_shinfo(skb)->nr_frags;
2212 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
2213 virt_to_page(padding), offset_in_page(padding),
2214 padlen);
2215
2216 skb->data_len += padlen;
2217 skb->truesize += padlen;
2218 skb->len += padlen;
2219 }
2220
2221 return 0;
2222}
2223EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
2224
2225int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2226{
2227 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2228 struct cxgbi_conn *cconn = tcp_conn->dd_data;
e3d2ad8c 2229 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
9ba682f0 2230 struct sk_buff *skb = tdata->skb;
2231 unsigned int datalen;
2232 int err;
2233
2234 if (!skb) {
2235 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2236 "task 0x%p, skb NULL.\n", task);
2237 return 0;
2238 }
2239
2240 datalen = skb->data_len;
2241 tdata->skb = NULL;
2242 err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2243 if (err > 0) {
2244 int pdulen = err;
2245
2246 log_debug(1 << CXGBI_DBG_PDU_TX,
2247 "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2248 task, task->sc, skb, skb->len, skb->data_len, err);
2249
2250 if (task->conn->hdrdgst_en)
2251 pdulen += ISCSI_DIGEST_SIZE;
2252
2253 if (datalen && task->conn->datadgst_en)
2254 pdulen += ISCSI_DIGEST_SIZE;
2255
2256 task->conn->txdata_octets += pdulen;
2257 return 0;
2258 }
2259
2260 if (err == -EAGAIN || err == -ENOBUFS) {
2261 log_debug(1 << CXGBI_DBG_PDU_TX,
2262 "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2263 task, skb, skb->len, skb->data_len, err);
2264 /* reset skb to send when we are called again */
2265 tdata->skb = skb;
2266 return err;
2267 }
2268
2269 kfree_skb(skb);
2270 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2271 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2272 task->itt, skb, skb->len, skb->data_len, err);
2273 iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2274 iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2275 return err;
2276}
2277EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2278
2279void cxgbi_cleanup_task(struct iscsi_task *task)
2280{
e3d2ad8c 2281 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
9ba682f0 2282
2283 log_debug(1 << CXGBI_DBG_ISCSI,
2284 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2285 task, tdata->skb, task->hdr_itt);
2286
2287 /* never reached the xmit task callout */
2288 if (tdata->skb)
2289 __kfree_skb(tdata->skb);
2290 memset(tdata, 0, sizeof(*tdata));
2291
2292 task_release_itt(task, task->hdr_itt);
2293 iscsi_tcp_cleanup_task(task);
2294}
2295EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2296
2297void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2298 struct iscsi_stats *stats)
2299{
2300 struct iscsi_conn *conn = cls_conn->dd_data;
2301
2302 stats->txdata_octets = conn->txdata_octets;
2303 stats->rxdata_octets = conn->rxdata_octets;
2304 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2305 stats->dataout_pdus = conn->dataout_pdus_cnt;
2306 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2307 stats->datain_pdus = conn->datain_pdus_cnt;
2308 stats->r2t_pdus = conn->r2t_pdus_cnt;
2309 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2310 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2311 stats->digest_err = 0;
2312 stats->timeout_err = 0;
2313 stats->custom_length = 1;
2314 strcpy(stats->custom[0].desc, "eh_abort_cnt");
2315 stats->custom[0].value = conn->eh_abort_cnt;
2316}
2317EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2318
2319static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2320{
2321 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2322 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2323 struct cxgbi_device *cdev = cconn->chba->cdev;
2324 unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2325 unsigned int max_def = 512 * MAX_SKB_FRAGS;
2326 unsigned int max = max(max_def, headroom);
2327
2328 max = min(cconn->chba->cdev->tx_max_size, max);
2329 if (conn->max_xmit_dlength)
2330 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2331 else
2332 conn->max_xmit_dlength = max;
2333 cxgbi_align_pdu_size(conn->max_xmit_dlength);
2334
2335 return 0;
2336}
2337
2338static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2339{
2340 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2341 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2342 unsigned int max = cconn->chba->cdev->rx_max_size;
2343
2344 cxgbi_align_pdu_size(max);
2345
2346 if (conn->max_recv_dlength) {
2347 if (conn->max_recv_dlength > max) {
2348 pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2349 conn->max_recv_dlength, max);
2350 return -EINVAL;
2351 }
2352 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2353 cxgbi_align_pdu_size(conn->max_recv_dlength);
2354 } else
2355 conn->max_recv_dlength = max;
2356
2357 return 0;
2358}
2359
2360int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2361 enum iscsi_param param, char *buf, int buflen)
2362{
2363 struct iscsi_conn *conn = cls_conn->dd_data;
9ba682f0 2364 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2365 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2366 struct cxgbi_sock *csk = cconn->cep->csk;
1304be5f 2367 int err;
9ba682f0 2368
2369 log_debug(1 << CXGBI_DBG_ISCSI,
2370 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2371 cls_conn, param, buflen, buf);
2372
2373 switch (param) {
2374 case ISCSI_PARAM_HDRDGST_EN:
2375 err = iscsi_set_param(cls_conn, param, buf, buflen);
2376 if (!err && conn->hdrdgst_en)
2377 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2378 conn->hdrdgst_en,
2379 conn->datadgst_en, 0);
2380 break;
2381 case ISCSI_PARAM_DATADGST_EN:
2382 err = iscsi_set_param(cls_conn, param, buf, buflen);
2383 if (!err && conn->datadgst_en)
2384 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2385 conn->hdrdgst_en,
2386 conn->datadgst_en, 0);
2387 break;
2388 case ISCSI_PARAM_MAX_R2T:
1304be5f 2389 return iscsi_tcp_set_max_r2t(conn, buf);
9ba682f0 2390 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2391 err = iscsi_set_param(cls_conn, param, buf, buflen);
2392 if (!err)
2393 err = cxgbi_conn_max_recv_dlength(conn);
2394 break;
2395 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2396 err = iscsi_set_param(cls_conn, param, buf, buflen);
2397 if (!err)
2398 err = cxgbi_conn_max_xmit_dlength(conn);
2399 break;
2400 default:
2401 return iscsi_set_param(cls_conn, param, buf, buflen);
2402 }
2403 return err;
2404}
2405EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2406
fc8d0590
AB		 2407static inline int csk_print_port(struct cxgbi_sock *csk, char *buf)
2408{
2409 int len;
2410
2411 cxgbi_sock_get(csk);
2412 len = sprintf(buf, "%hu\n", ntohs(csk->daddr.sin_port));
2413 cxgbi_sock_put(csk);
2414
2415 return len;
2416}
2417
2418static inline int csk_print_ip(struct cxgbi_sock *csk, char *buf)
2419{
2420 int len;
2421
2422 cxgbi_sock_get(csk);
2423 if (csk->csk_family == AF_INET)
2424 len = sprintf(buf, "%pI4",
2425 &csk->daddr.sin_addr.s_addr);
2426 else
2427 len = sprintf(buf, "%pI6",
2428 &csk->daddr6.sin6_addr);
2429
2430 cxgbi_sock_put(csk);
2431
2432 return len;
2433}
2434
c71b9b66
MC		 2435int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2436 char *buf)
9ba682f0 2437{
c71b9b66
MC		 2438 struct cxgbi_endpoint *cep = ep->dd_data;
2439 struct cxgbi_sock *csk;
9ba682f0 2440 int len;
2441
2442 log_debug(1 << CXGBI_DBG_ISCSI,
c71b9b66 2443 "cls_conn 0x%p, param %d.\n", ep, param);
9ba682f0 2444
2445 switch (param) {
2446 case ISCSI_PARAM_CONN_PORT:
9ba682f0 2447 case ISCSI_PARAM_CONN_ADDRESS:
c71b9b66
MC		 2448 if (!cep)
2449 return -ENOTCONN;
2450
2451 csk = cep->csk;
2452 if (!csk)
2453 return -ENOTCONN;
2454
2455 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2456 &csk->daddr, param, buf);
9ba682f0 2457 default:
c71b9b66 2458 return -ENOSYS;
9ba682f0 2459 }
2460 return len;
2461}
c71b9b66 2462EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
9ba682f0 2463
2464struct iscsi_cls_conn *
2465cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2466{
2467 struct iscsi_cls_conn *cls_conn;
2468 struct iscsi_conn *conn;
2469 struct iscsi_tcp_conn *tcp_conn;
2470 struct cxgbi_conn *cconn;
2471
2472 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2473 if (!cls_conn)
2474 return NULL;
2475
2476 conn = cls_conn->dd_data;
2477 tcp_conn = conn->dd_data;
2478 cconn = tcp_conn->dd_data;
2479 cconn->iconn = conn;
2480
2481 log_debug(1 << CXGBI_DBG_ISCSI,
2482 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2483 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2484
2485 return cls_conn;
2486}
2487EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2488
2489int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2490 struct iscsi_cls_conn *cls_conn,
2491 u64 transport_eph, int is_leading)
2492{
2493 struct iscsi_conn *conn = cls_conn->dd_data;
2494 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2495 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2496 struct iscsi_endpoint *ep;
2497 struct cxgbi_endpoint *cep;
2498 struct cxgbi_sock *csk;
2499 int err;
2500
2501 ep = iscsi_lookup_endpoint(transport_eph);
2502 if (!ep)
2503 return -EINVAL;
2504
2505 /* setup ddp pagesize */
2506 cep = ep->dd_data;
2507 csk = cep->csk;
2508 err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid, page_idx, 0);
2509 if (err < 0)
2510 return err;
2511
2512 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2513 if (err)
2514 return -EINVAL;
2515
2516 /* calculate the tag idx bits needed for this conn based on cmds_max */
2517 cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2518
e3d2ad8c 2519 write_lock_bh(&csk->callback_lock);
9ba682f0 2520 csk->user_data = conn;
2521 cconn->chba = cep->chba;
2522 cconn->cep = cep;
2523 cep->cconn = cconn;
e3d2ad8c 2524 write_unlock_bh(&csk->callback_lock);
9ba682f0 2525
2526 cxgbi_conn_max_xmit_dlength(conn);
2527 cxgbi_conn_max_recv_dlength(conn);
2528
9ba682f0 2529 log_debug(1 << CXGBI_DBG_ISCSI,
2530 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2531 cls_session, cls_conn, ep, cconn, csk);
2532 /* init recv engine */
2533 iscsi_tcp_hdr_recv_prep(tcp_conn);
2534
2535 return 0;
2536}
2537EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2538
2539struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2540 u16 cmds_max, u16 qdepth,
2541 u32 initial_cmdsn)
2542{
2543 struct cxgbi_endpoint *cep;
2544 struct cxgbi_hba *chba;
2545 struct Scsi_Host *shost;
2546 struct iscsi_cls_session *cls_session;
2547 struct iscsi_session *session;
2548
2549 if (!ep) {
2550 pr_err("missing endpoint.\n");
2551 return NULL;
2552 }
2553
2554 cep = ep->dd_data;
2555 chba = cep->chba;
2556 shost = chba->shost;
2557
2558 BUG_ON(chba != iscsi_host_priv(shost));
2559
2560 cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2561 cmds_max, 0,
2562 sizeof(struct iscsi_tcp_task) +
2563 sizeof(struct cxgbi_task_data),
2564 initial_cmdsn, ISCSI_MAX_TARGET);
2565 if (!cls_session)
2566 return NULL;
2567
2568 session = cls_session->dd_data;
2569 if (iscsi_tcp_r2tpool_alloc(session))
2570 goto remove_session;
2571
2572 log_debug(1 << CXGBI_DBG_ISCSI,
2573 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2574 return cls_session;
2575
2576remove_session:
2577 iscsi_session_teardown(cls_session);
2578 return NULL;
2579}
2580EXPORT_SYMBOL_GPL(cxgbi_create_session);
2581
2582void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2583{
2584 log_debug(1 << CXGBI_DBG_ISCSI,
2585 "cls sess 0x%p.\n", cls_session);
2586
2587 iscsi_tcp_r2tpool_free(cls_session->dd_data);
2588 iscsi_session_teardown(cls_session);
2589}
2590EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2591
2592int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2593 char *buf, int buflen)
2594{
2595 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2596
2597 if (!chba->ndev) {
2598 shost_printk(KERN_ERR, shost, "Could not get host param. "
2599 "netdev for host not set.\n");
2600 return -ENODEV;
2601 }
2602
2603 log_debug(1 << CXGBI_DBG_ISCSI,
2604 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2605 shost, chba, chba->ndev->name, param, buflen, buf);
2606
2607 switch (param) {
2608 case ISCSI_HOST_PARAM_IPADDRESS:
2609 {
2610 __be32 addr = in_aton(buf);
2611 log_debug(1 << CXGBI_DBG_ISCSI,
2612 "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2613 cxgbi_set_iscsi_ipv4(chba, addr);
2614 return 0;
2615 }
2616 case ISCSI_HOST_PARAM_HWADDRESS:
2617 case ISCSI_HOST_PARAM_NETDEV_NAME:
2618 return 0;
2619 default:
2620 return iscsi_host_set_param(shost, param, buf, buflen);
2621 }
2622}
2623EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2624
2625int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2626 char *buf)
2627{
2628 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2629 int len = 0;
2630
2631 if (!chba->ndev) {
2632 shost_printk(KERN_ERR, shost, "Could not get host param. "
2633 "netdev for host not set.\n");
2634 return -ENODEV;
2635 }
2636
2637 log_debug(1 << CXGBI_DBG_ISCSI,
2638 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2639 shost, chba, chba->ndev->name, param);
2640
2641 switch (param) {
2642 case ISCSI_HOST_PARAM_HWADDRESS:
2643 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2644 break;
2645 case ISCSI_HOST_PARAM_NETDEV_NAME:
2646 len = sprintf(buf, "%s\n", chba->ndev->name);
2647 break;
2648 case ISCSI_HOST_PARAM_IPADDRESS:
2649 {
2650 __be32 addr;
2651
2652 addr = cxgbi_get_iscsi_ipv4(chba);
2653 len = sprintf(buf, "%pI4", &addr);
2654 log_debug(1 << CXGBI_DBG_ISCSI,
2655 "hba %s, ipv4 %pI4.\n", chba->ndev->name, &addr);
2656 break;
2657 }
2658 default:
2659 return iscsi_host_get_param(shost, param, buf);
2660 }
2661
2662 return len;
2663}
2664EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2665
2666struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2667 struct sockaddr *dst_addr,
2668 int non_blocking)
2669{
2670 struct iscsi_endpoint *ep;
2671 struct cxgbi_endpoint *cep;
2672 struct cxgbi_hba *hba = NULL;
2673 struct cxgbi_sock *csk;
2674 int err = -EINVAL;
2675
2676 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2677 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2678 shost, non_blocking, dst_addr);
2679
2680 if (shost) {
2681 hba = iscsi_host_priv(shost);
2682 if (!hba) {
2683 pr_info("shost 0x%p, priv NULL.\n", shost);
2684 goto err_out;
2685 }
2686 }
2687
fc8d0590
AB		 2688 if (dst_addr->sa_family == AF_INET) {
2689 csk = cxgbi_check_route(dst_addr);
e81fbf6c 2690#if IS_ENABLED(CONFIG_IPV6)
fc8d0590
AB		 2691 } else if (dst_addr->sa_family == AF_INET6) {
2692 csk = cxgbi_check_route6(dst_addr);
e81fbf6c 2693#endif
fc8d0590
AB		 2694 } else {
2695 pr_info("address family 0x%x NOT supported.\n",
2696 dst_addr->sa_family);
2697 err = -EAFNOSUPPORT;
2698 return (struct iscsi_endpoint *)ERR_PTR(err);
2699 }
2700
9ba682f0 2701 if (IS_ERR(csk))
2702 return (struct iscsi_endpoint *)csk;
2703 cxgbi_sock_get(csk);
2704
2705 if (!hba)
2706 hba = csk->cdev->hbas[csk->port_id];
2707 else if (hba != csk->cdev->hbas[csk->port_id]) {
2708 pr_info("Could not connect through requested host %u"
2709 "hba 0x%p != 0x%p (%u).\n",
2710 shost->host_no, hba,
2711 csk->cdev->hbas[csk->port_id], csk->port_id);
2712 err = -ENOSPC;
2713 goto release_conn;
2714 }
2715
2716 err = sock_get_port(csk);
2717 if (err)
2718 goto release_conn;
2719
2720 cxgbi_sock_set_state(csk, CTP_CONNECTING);
2721 err = csk->cdev->csk_init_act_open(csk);
2722 if (err)
2723 goto release_conn;
2724
2725 if (cxgbi_sock_is_closing(csk)) {
2726 err = -ENOSPC;
2727 pr_info("csk 0x%p is closing.\n", csk);
2728 goto release_conn;
2729 }
2730
2731 ep = iscsi_create_endpoint(sizeof(*cep));
2732 if (!ep) {
2733 err = -ENOMEM;
2734 pr_info("iscsi alloc ep, OOM.\n");
2735 goto release_conn;
2736 }
2737
2738 cep = ep->dd_data;
2739 cep->csk = csk;
2740 cep->chba = hba;
2741
2742 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2743 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2744 ep, cep, csk, hba, hba->ndev->name);
2745 return ep;
2746
2747release_conn:
2748 cxgbi_sock_put(csk);
2749 cxgbi_sock_closed(csk);
2750err_out:
2751 return ERR_PTR(err);
2752}
2753EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2754
2755int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2756{
2757 struct cxgbi_endpoint *cep = ep->dd_data;
2758 struct cxgbi_sock *csk = cep->csk;
2759
2760 if (!cxgbi_sock_is_established(csk))
2761 return 0;
2762 return 1;
2763}
2764EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2765
2766void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2767{
2768 struct cxgbi_endpoint *cep = ep->dd_data;
2769 struct cxgbi_conn *cconn = cep->cconn;
2770 struct cxgbi_sock *csk = cep->csk;
2771
2772 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2773 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2774 ep, cep, cconn, csk, csk->state, csk->flags);
2775
2776 if (cconn && cconn->iconn) {
2777 iscsi_suspend_tx(cconn->iconn);
2778 write_lock_bh(&csk->callback_lock);
2779 cep->csk->user_data = NULL;
2780 cconn->cep = NULL;
2781 write_unlock_bh(&csk->callback_lock);
2782 }
2783 iscsi_destroy_endpoint(ep);
2784
2785 if (likely(csk->state >= CTP_ESTABLISHED))
2786 need_active_close(csk);
2787 else
2788 cxgbi_sock_closed(csk);
2789
2790 cxgbi_sock_put(csk);
2791}
2792EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2793
2794int cxgbi_iscsi_init(struct iscsi_transport *itp,
2795 struct scsi_transport_template **stt)
2796{
2797 *stt = iscsi_register_transport(itp);
2798 if (*stt == NULL) {
2799 pr_err("unable to register %s transport 0x%p.\n",
2800 itp->name, itp);
2801 return -ENODEV;
2802 }
2803 log_debug(1 << CXGBI_DBG_ISCSI,
2804 "%s, registered iscsi transport 0x%p.\n",
2805 itp->name, stt);
2806 return 0;
2807}
2808EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2809
2810void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2811 struct scsi_transport_template **stt)
2812{
2813 if (*stt) {
2814 log_debug(1 << CXGBI_DBG_ISCSI,
2815 "de-register transport 0x%p, %s, stt 0x%p.\n",
2816 itp, itp->name, *stt);
2817 *stt = NULL;
2818 iscsi_unregister_transport(itp);
2819 }
2820}
2821EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2822
587a1f16 2823umode_t cxgbi_attr_is_visible(int param_type, int param)
3128c6c7
MC		 2824{
2825 switch (param_type) {
f27fb2ef
MC		 2826 case ISCSI_HOST_PARAM:
2827 switch (param) {
2828 case ISCSI_HOST_PARAM_NETDEV_NAME:
2829 case ISCSI_HOST_PARAM_HWADDRESS:
2830 case ISCSI_HOST_PARAM_IPADDRESS:
2831 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2832 return S_IRUGO;
2833 default:
2834 return 0;
2835 }
3128c6c7
MC		 2836 case ISCSI_PARAM:
2837 switch (param) {
2838 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2839 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2840 case ISCSI_PARAM_HDRDGST_EN:
2841 case ISCSI_PARAM_DATADGST_EN:
2842 case ISCSI_PARAM_CONN_ADDRESS:
2843 case ISCSI_PARAM_CONN_PORT:
2844 case ISCSI_PARAM_EXP_STATSN:
2845 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2846 case ISCSI_PARAM_PERSISTENT_PORT:
2847 case ISCSI_PARAM_PING_TMO:
2848 case ISCSI_PARAM_RECV_TMO:
1d063c17
MC		 2849 case ISCSI_PARAM_INITIAL_R2T_EN:
2850 case ISCSI_PARAM_MAX_R2T:
2851 case ISCSI_PARAM_IMM_DATA_EN:
2852 case ISCSI_PARAM_FIRST_BURST:
2853 case ISCSI_PARAM_MAX_BURST:
2854 case ISCSI_PARAM_PDU_INORDER_EN:
2855 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2856 case ISCSI_PARAM_ERL:
2857 case ISCSI_PARAM_TARGET_NAME:
2858 case ISCSI_PARAM_TPGT:
2859 case ISCSI_PARAM_USERNAME:
2860 case ISCSI_PARAM_PASSWORD:
2861 case ISCSI_PARAM_USERNAME_IN:
2862 case ISCSI_PARAM_PASSWORD_IN:
2863 case ISCSI_PARAM_FAST_ABORT:
2864 case ISCSI_PARAM_ABORT_TMO:
2865 case ISCSI_PARAM_LU_RESET_TMO:
2866 case ISCSI_PARAM_TGT_RESET_TMO:
2867 case ISCSI_PARAM_IFACE_NAME:
2868 case ISCSI_PARAM_INITIATOR_NAME:
3128c6c7
MC		 2869 return S_IRUGO;
2870 default:
2871 return 0;
2872 }
2873 }
2874
2875 return 0;
2876}
2877EXPORT_SYMBOL_GPL(cxgbi_attr_is_visible);
2878
9ba682f0 2879static int __init libcxgbi_init_module(void)
2880{
2881 sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
2882 sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
2883
2884 pr_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
2885 ISCSI_ITT_MASK, sw_tag_idx_bits,
2886 ISCSI_AGE_MASK, sw_tag_age_bits);
2887
2888 ddp_setup_host_page_size();
2889 return 0;
2890}
2891
2892static void __exit libcxgbi_exit_module(void)
2893{
2894 cxgbi_device_unregister_all(0xFF);
2895 return;
2896}
2897
2898module_init(libcxgbi_init_module);
2899module_exit(libcxgbi_exit_module);
Linux kernel - Deliverables
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