projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
[SCSI] iscsi class: add callout to get iscsi_endpoint values
[GitHub/mt8127/android_kernel_alcatel_ttab.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>
27#include <linux/inetdevice.h> /* ip_dev_find */
28#include <net/tcp.h>
29
30static unsigned int dbg_level;
31
32#include "libcxgbi.h"
33
34#define DRV_MODULE_NAME "libcxgbi"
35#define DRV_MODULE_DESC "Chelsio iSCSI driver library"
36#define DRV_MODULE_VERSION "0.9.0"
37#define DRV_MODULE_RELDATE "Jun. 2010"
38
39MODULE_AUTHOR("Chelsio Communications, Inc.");
40MODULE_DESCRIPTION(DRV_MODULE_DESC);
41MODULE_VERSION(DRV_MODULE_VERSION);
42MODULE_LICENSE("GPL");
43
44module_param(dbg_level, uint, 0644);
45MODULE_PARM_DESC(dbg_level, "libiscsi debug level (default=0)");
46
47
48/*
49 * cxgbi device management
50 * maintains a list of the cxgbi devices
51 */
52static LIST_HEAD(cdev_list);
53static DEFINE_MUTEX(cdev_mutex);
54
55int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
56 unsigned int max_conn)
57{
58 struct cxgbi_ports_map *pmap = &cdev->pmap;
59
60 pmap->port_csk = cxgbi_alloc_big_mem(max_conn *
61 sizeof(struct cxgbi_sock *),
62 GFP_KERNEL);
63 if (!pmap->port_csk) {
64 pr_warn("cdev 0x%p, portmap OOM %u.\n", cdev, max_conn);
65 return -ENOMEM;
66 }
67
68 pmap->max_connect = max_conn;
69 pmap->sport_base = base;
70 spin_lock_init(&pmap->lock);
71 return 0;
72}
73EXPORT_SYMBOL_GPL(cxgbi_device_portmap_create);
74
75void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev)
76{
77 struct cxgbi_ports_map *pmap = &cdev->pmap;
78 struct cxgbi_sock *csk;
79 int i;
80
81 for (i = 0; i < pmap->max_connect; i++) {
82 if (pmap->port_csk[i]) {
83 csk = pmap->port_csk[i];
84 pmap->port_csk[i] = NULL;
85 log_debug(1 << CXGBI_DBG_SOCK,
86 "csk 0x%p, cdev 0x%p, offload down.\n",
87 csk, cdev);
88 spin_lock_bh(&csk->lock);
89 cxgbi_sock_set_flag(csk, CTPF_OFFLOAD_DOWN);
90 cxgbi_sock_closed(csk);
91 spin_unlock_bh(&csk->lock);
92 cxgbi_sock_put(csk);
93 }
94 }
95}
96EXPORT_SYMBOL_GPL(cxgbi_device_portmap_cleanup);
97
98static inline void cxgbi_device_destroy(struct cxgbi_device *cdev)
99{
100 log_debug(1 << CXGBI_DBG_DEV,
101 "cdev 0x%p, p# %u.\n", cdev, cdev->nports);
102 cxgbi_hbas_remove(cdev);
103 cxgbi_device_portmap_cleanup(cdev);
104 if (cdev->dev_ddp_cleanup)
105 cdev->dev_ddp_cleanup(cdev);
106 else
107 cxgbi_ddp_cleanup(cdev);
108 if (cdev->ddp)
109 cxgbi_ddp_cleanup(cdev);
110 if (cdev->pmap.max_connect)
111 cxgbi_free_big_mem(cdev->pmap.port_csk);
112 kfree(cdev);
113}
114
115struct cxgbi_device *cxgbi_device_register(unsigned int extra,
116 unsigned int nports)
117{
118 struct cxgbi_device *cdev;
119
120 cdev = kzalloc(sizeof(*cdev) + extra + nports *
121 (sizeof(struct cxgbi_hba *) +
122 sizeof(struct net_device *)),
123 GFP_KERNEL);
124 if (!cdev) {
125 pr_warn("nport %d, OOM.\n", nports);
126 return NULL;
127 }
128 cdev->ports = (struct net_device **)(cdev + 1);
129 cdev->hbas = (struct cxgbi_hba **)(((char*)cdev->ports) + nports *
130 sizeof(struct net_device *));
131 if (extra)
132 cdev->dd_data = ((char *)cdev->hbas) +
133 nports * sizeof(struct cxgbi_hba *);
134 spin_lock_init(&cdev->pmap.lock);
135
136 mutex_lock(&cdev_mutex);
137 list_add_tail(&cdev->list_head, &cdev_list);
138 mutex_unlock(&cdev_mutex);
139
140 log_debug(1 << CXGBI_DBG_DEV,
141 "cdev 0x%p, p# %u.\n", cdev, nports);
142 return cdev;
143}
144EXPORT_SYMBOL_GPL(cxgbi_device_register);
145
146void cxgbi_device_unregister(struct cxgbi_device *cdev)
147{
148 log_debug(1 << CXGBI_DBG_DEV,
149 "cdev 0x%p, p# %u,%s.\n",
150 cdev, cdev->nports, cdev->nports ? cdev->ports[0]->name : "");
151 mutex_lock(&cdev_mutex);
152 list_del(&cdev->list_head);
153 mutex_unlock(&cdev_mutex);
154 cxgbi_device_destroy(cdev);
155}
156EXPORT_SYMBOL_GPL(cxgbi_device_unregister);
157
158void cxgbi_device_unregister_all(unsigned int flag)
159{
160 struct cxgbi_device *cdev, *tmp;
161
162 mutex_lock(&cdev_mutex);
163 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
164 if ((cdev->flags & flag) == flag) {
165 log_debug(1 << CXGBI_DBG_DEV,
166 "cdev 0x%p, p# %u,%s.\n",
167 cdev, cdev->nports, cdev->nports ?
168 cdev->ports[0]->name : "");
169 list_del(&cdev->list_head);
170 cxgbi_device_destroy(cdev);
171 }
172 }
173 mutex_unlock(&cdev_mutex);
174}
175EXPORT_SYMBOL_GPL(cxgbi_device_unregister_all);
176
177struct cxgbi_device *cxgbi_device_find_by_lldev(void *lldev)
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->lldev == lldev) {
184 mutex_unlock(&cdev_mutex);
185 return cdev;
186 }
187 }
188 mutex_unlock(&cdev_mutex);
189 log_debug(1 << CXGBI_DBG_DEV,
190 "lldev 0x%p, NO match found.\n", lldev);
191 return NULL;
192}
193EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev);
194
195static struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev,
196 int *port)
197{
0b3d8947 198 struct net_device *vdev = NULL;
9ba682f0 199 struct cxgbi_device *cdev, *tmp;
200 int i;
201
0b3d8947 202 if (ndev->priv_flags & IFF_802_1Q_VLAN) {
203 vdev = ndev;
9ba682f0 204 ndev = vlan_dev_real_dev(ndev);
0b3d8947 205 log_debug(1 << CXGBI_DBG_DEV,
206 "vlan dev %s -> %s.\n", vdev->name, ndev->name);
207 }
9ba682f0 208
209 mutex_lock(&cdev_mutex);
210 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
211 for (i = 0; i < cdev->nports; i++) {
212 if (ndev == cdev->ports[i]) {
0b3d8947 213 cdev->hbas[i]->vdev = vdev;
9ba682f0 214 mutex_unlock(&cdev_mutex);
215 if (port)
216 *port = i;
217 return cdev;
218 }
219 }
220 }
221 mutex_unlock(&cdev_mutex);
222 log_debug(1 << CXGBI_DBG_DEV,
223 "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
224 return NULL;
225}
226
9ba682f0 227void cxgbi_hbas_remove(struct cxgbi_device *cdev)
228{
229 int i;
230 struct cxgbi_hba *chba;
231
232 log_debug(1 << CXGBI_DBG_DEV,
233 "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
234
235 for (i = 0; i < cdev->nports; i++) {
236 chba = cdev->hbas[i];
237 if (chba) {
238 cdev->hbas[i] = NULL;
239 iscsi_host_remove(chba->shost);
240 pci_dev_put(cdev->pdev);
241 iscsi_host_free(chba->shost);
242 }
243 }
244}
245EXPORT_SYMBOL_GPL(cxgbi_hbas_remove);
246
247int cxgbi_hbas_add(struct cxgbi_device *cdev, unsigned int max_lun,
248 unsigned int max_id, struct scsi_host_template *sht,
249 struct scsi_transport_template *stt)
250{
251 struct cxgbi_hba *chba;
252 struct Scsi_Host *shost;
253 int i, err;
254
255 log_debug(1 << CXGBI_DBG_DEV, "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
256
257 for (i = 0; i < cdev->nports; i++) {
258 shost = iscsi_host_alloc(sht, sizeof(*chba), 1);
259 if (!shost) {
260 pr_info("0x%p, p%d, %s, host alloc failed.\n",
261 cdev, i, cdev->ports[i]->name);
262 err = -ENOMEM;
263 goto err_out;
264 }
265
266 shost->transportt = stt;
267 shost->max_lun = max_lun;
268 shost->max_id = max_id;
269 shost->max_channel = 0;
270 shost->max_cmd_len = 16;
271
272 chba = iscsi_host_priv(shost);
273 chba->cdev = cdev;
274 chba->ndev = cdev->ports[i];
275 chba->shost = shost;
276
277 log_debug(1 << CXGBI_DBG_DEV,
278 "cdev 0x%p, p#%d %s: chba 0x%p.\n",
279 cdev, i, cdev->ports[i]->name, chba);
280
281 pci_dev_get(cdev->pdev);
282 err = iscsi_host_add(shost, &cdev->pdev->dev);
283 if (err) {
284 pr_info("cdev 0x%p, p#%d %s, host add failed.\n",
285 cdev, i, cdev->ports[i]->name);
286 pci_dev_put(cdev->pdev);
287 scsi_host_put(shost);
288 goto err_out;
289 }
290
291 cdev->hbas[i] = chba;
292 }
293
294 return 0;
295
296err_out:
297 cxgbi_hbas_remove(cdev);
298 return err;
299}
300EXPORT_SYMBOL_GPL(cxgbi_hbas_add);
301
302/*
303 * iSCSI offload
304 *
305 * - source port management
306 * To find a free source port in the port allocation map we use a very simple
307 * rotor scheme to look for the next free port.
308 *
309 * If a source port has been specified make sure that it doesn't collide with
310 * our normal source port allocation map. If it's outside the range of our
311 * allocation/deallocation scheme just let them use it.
312 *
313 * If the source port is outside our allocation range, the caller is
314 * responsible for keeping track of their port usage.
315 */
316static int sock_get_port(struct cxgbi_sock *csk)
317{
318 struct cxgbi_device *cdev = csk->cdev;
319 struct cxgbi_ports_map *pmap = &cdev->pmap;
320 unsigned int start;
321 int idx;
322
323 if (!pmap->max_connect) {
324 pr_err("cdev 0x%p, p#%u %s, NO port map.\n",
325 cdev, csk->port_id, cdev->ports[csk->port_id]->name);
326 return -EADDRNOTAVAIL;
327 }
328
329 if (csk->saddr.sin_port) {
330 pr_err("source port NON-ZERO %u.\n",
331 ntohs(csk->saddr.sin_port));
332 return -EADDRINUSE;
333 }
334
335 spin_lock_bh(&pmap->lock);
336 if (pmap->used >= pmap->max_connect) {
337 spin_unlock_bh(&pmap->lock);
338 pr_info("cdev 0x%p, p#%u %s, ALL ports used.\n",
339 cdev, csk->port_id, cdev->ports[csk->port_id]->name);
340 return -EADDRNOTAVAIL;
341 }
342
343 start = idx = pmap->next;
344 do {
345 if (++idx >= pmap->max_connect)
346 idx = 0;
347 if (!pmap->port_csk[idx]) {
348 pmap->used++;
349 csk->saddr.sin_port =
350 htons(pmap->sport_base + idx);
351 pmap->next = idx;
352 pmap->port_csk[idx] = csk;
353 spin_unlock_bh(&pmap->lock);
354 cxgbi_sock_get(csk);
355 log_debug(1 << CXGBI_DBG_SOCK,
356 "cdev 0x%p, p#%u %s, p %u, %u.\n",
357 cdev, csk->port_id,
358 cdev->ports[csk->port_id]->name,
359 pmap->sport_base + idx, pmap->next);
360 return 0;
361 }
362 } while (idx != start);
363 spin_unlock_bh(&pmap->lock);
364
365 /* should not happen */
366 pr_warn("cdev 0x%p, p#%u %s, next %u?\n",
367 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
368 pmap->next);
369 return -EADDRNOTAVAIL;
370}
371
372static void sock_put_port(struct cxgbi_sock *csk)
373{
374 struct cxgbi_device *cdev = csk->cdev;
375 struct cxgbi_ports_map *pmap = &cdev->pmap;
376
377 if (csk->saddr.sin_port) {
378 int idx = ntohs(csk->saddr.sin_port) - pmap->sport_base;
379
380 csk->saddr.sin_port = 0;
381 if (idx < 0 || idx >= pmap->max_connect) {
382 pr_err("cdev 0x%p, p#%u %s, port %u OOR.\n",
383 cdev, csk->port_id,
384 cdev->ports[csk->port_id]->name,
385 ntohs(csk->saddr.sin_port));
386 return;
387 }
388
389 spin_lock_bh(&pmap->lock);
390 pmap->port_csk[idx] = NULL;
391 pmap->used--;
392 spin_unlock_bh(&pmap->lock);
393
394 log_debug(1 << CXGBI_DBG_SOCK,
395 "cdev 0x%p, p#%u %s, release %u.\n",
396 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
397 pmap->sport_base + idx);
398
399 cxgbi_sock_put(csk);
400 }
401}
402
403/*
404 * iscsi tcp connection
405 */
406void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *csk)
407{
408 if (csk->cpl_close) {
409 kfree_skb(csk->cpl_close);
410 csk->cpl_close = NULL;
411 }
412 if (csk->cpl_abort_req) {
413 kfree_skb(csk->cpl_abort_req);
414 csk->cpl_abort_req = NULL;
415 }
416 if (csk->cpl_abort_rpl) {
417 kfree_skb(csk->cpl_abort_rpl);
418 csk->cpl_abort_rpl = NULL;
419 }
420}
421EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs);
422
423static struct cxgbi_sock *cxgbi_sock_create(struct cxgbi_device *cdev)
424{
425 struct cxgbi_sock *csk = kzalloc(sizeof(*csk), GFP_NOIO);
426
427 if (!csk) {
428 pr_info("alloc csk %zu failed.\n", sizeof(*csk));
429 return NULL;
430 }
431
432 if (cdev->csk_alloc_cpls(csk) < 0) {
433 pr_info("csk 0x%p, alloc cpls failed.\n", csk);
434 kfree(csk);
435 return NULL;
436 }
437
438 spin_lock_init(&csk->lock);
439 kref_init(&csk->refcnt);
440 skb_queue_head_init(&csk->receive_queue);
441 skb_queue_head_init(&csk->write_queue);
442 setup_timer(&csk->retry_timer, NULL, (unsigned long)csk);
443 rwlock_init(&csk->callback_lock);
444 csk->cdev = cdev;
445 csk->flags = 0;
446 cxgbi_sock_set_state(csk, CTP_CLOSED);
447
448 log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk);
449
450 return csk;
451}
452
453static struct rtable *find_route_ipv4(__be32 saddr, __be32 daddr,
454 __be16 sport, __be16 dport, u8 tos)
455{
456 struct rtable *rt;
457 struct flowi fl = {
458 .oif = 0,
459 .nl_u = {
460 .ip4_u = {
461 .daddr = daddr,
462 .saddr = saddr,
463 .tos = tos }
464 },
465 .proto = IPPROTO_TCP,
466 .uli_u = {
467 .ports = {
468 .sport = sport,
469 .dport = dport }
470 }
471 };
472
473 if (ip_route_output_flow(&init_net, &rt, &fl, NULL, 0))
474 return NULL;
475
476 return rt;
477}
478
479static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr)
480{
481 struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
482 struct dst_entry *dst;
483 struct net_device *ndev;
484 struct cxgbi_device *cdev;
485 struct rtable *rt = NULL;
486 struct cxgbi_sock *csk = NULL;
487 unsigned int mtu = 0;
488 int port = 0xFFFF;
489 int err = 0;
490
491 if (daddr->sin_family != AF_INET) {
492 pr_info("address family 0x%x NOT supported.\n",
493 daddr->sin_family);
494 err = -EAFNOSUPPORT;
495 goto err_out;
496 }
497
498 rt = find_route_ipv4(0, daddr->sin_addr.s_addr, 0, daddr->sin_port, 0);
499 if (!rt) {
500 pr_info("no route to ipv4 0x%x, port %u.\n",
501 daddr->sin_addr.s_addr, daddr->sin_port);
502 err = -ENETUNREACH;
503 goto err_out;
504 }
505 dst = &rt->dst;
506 ndev = dst->neighbour->dev;
507
508 if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
509 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
510 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
511 ndev->name);
512 err = -ENETUNREACH;
513 goto rel_rt;
514 }
515
516 if (ndev->flags & IFF_LOOPBACK) {
517 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
518 mtu = ndev->mtu;
519 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
520 dst->neighbour->dev->name, ndev->name, mtu);
521 }
522
9ba682f0 523 cdev = cxgbi_device_find_by_netdev(ndev, &port);
524 if (!cdev) {
525 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
526 &daddr->sin_addr.s_addr, ndev->name);
527 err = -ENETUNREACH;
528 goto rel_rt;
529 }
530 log_debug(1 << CXGBI_DBG_SOCK,
531 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
532 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
533 port, ndev->name, cdev);
534
535 csk = cxgbi_sock_create(cdev);
536 if (!csk) {
537 err = -ENOMEM;
538 goto rel_rt;
539 }
540 csk->cdev = cdev;
541 csk->port_id = port;
542 csk->mtu = mtu;
543 csk->dst = dst;
544 csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
545 csk->daddr.sin_port = daddr->sin_port;
0b3d8947 546 csk->saddr.sin_addr.s_addr = rt->rt_src;
9ba682f0 547
548 return csk;
549
550rel_rt:
551 ip_rt_put(rt);
552 if (csk)
553 cxgbi_sock_closed(csk);
554err_out:
555 return ERR_PTR(err);
556}
557
558void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
559 unsigned int opt)
560{
561 csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
562 dst_confirm(csk->dst);
563 smp_mb();
564 cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
565}
566EXPORT_SYMBOL_GPL(cxgbi_sock_established);
567
568static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
569{
570 log_debug(1 << CXGBI_DBG_SOCK,
571 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
572 csk, csk->state, csk->flags, csk->user_data);
573
574 if (csk->state != CTP_ESTABLISHED) {
e3d2ad8c 575 read_lock_bh(&csk->callback_lock);
9ba682f0 576 if (csk->user_data)
577 iscsi_conn_failure(csk->user_data,
578 ISCSI_ERR_CONN_FAILED);
e3d2ad8c 579 read_unlock_bh(&csk->callback_lock);
9ba682f0 580 }
581}
582
583void cxgbi_sock_closed(struct cxgbi_sock *csk)
584{
585 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
586 csk, (csk)->state, (csk)->flags, (csk)->tid);
587 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
588 if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
589 return;
590 if (csk->saddr.sin_port)
591 sock_put_port(csk);
592 if (csk->dst)
593 dst_release(csk->dst);
594 csk->cdev->csk_release_offload_resources(csk);
595 cxgbi_sock_set_state(csk, CTP_CLOSED);
596 cxgbi_inform_iscsi_conn_closing(csk);
597 cxgbi_sock_put(csk);
598}
599EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
600
601static void need_active_close(struct cxgbi_sock *csk)
602{
603 int data_lost;
604 int close_req = 0;
605
606 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
607 csk, (csk)->state, (csk)->flags, (csk)->tid);
608 spin_lock_bh(&csk->lock);
609 dst_confirm(csk->dst);
610 data_lost = skb_queue_len(&csk->receive_queue);
611 __skb_queue_purge(&csk->receive_queue);
612
613 if (csk->state == CTP_ACTIVE_OPEN)
614 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
615 else if (csk->state == CTP_ESTABLISHED) {
616 close_req = 1;
617 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
618 } else if (csk->state == CTP_PASSIVE_CLOSE) {
619 close_req = 1;
620 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
621 }
622
623 if (close_req) {
624 if (data_lost)
625 csk->cdev->csk_send_abort_req(csk);
626 else
627 csk->cdev->csk_send_close_req(csk);
628 }
629
630 spin_unlock_bh(&csk->lock);
631}
632
633void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
634{
635 pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
636 csk, csk->state, csk->flags,
637 &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
638 &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
639 errno);
640
641 cxgbi_sock_set_state(csk, CTP_CONNECTING);
642 csk->err = errno;
643 cxgbi_sock_closed(csk);
644}
645EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
646
647void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
648{
649 struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
650
651 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
652 csk, (csk)->state, (csk)->flags, (csk)->tid);
653 cxgbi_sock_get(csk);
654 spin_lock_bh(&csk->lock);
655 if (csk->state == CTP_ACTIVE_OPEN)
656 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
657 spin_unlock_bh(&csk->lock);
658 cxgbi_sock_put(csk);
659 __kfree_skb(skb);
660}
661EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
662
663void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
664{
665 cxgbi_sock_get(csk);
666 spin_lock_bh(&csk->lock);
667 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
668 if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_RCVD))
669 cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
670 else {
671 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_RCVD);
672 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
673 if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
674 pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
675 csk, csk->state, csk->flags, csk->tid);
676 cxgbi_sock_closed(csk);
677 }
678 }
679 spin_unlock_bh(&csk->lock);
680 cxgbi_sock_put(csk);
681}
682EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
683
684void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
685{
686 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
687 csk, (csk)->state, (csk)->flags, (csk)->tid);
688 cxgbi_sock_get(csk);
689 spin_lock_bh(&csk->lock);
690
691 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
692 goto done;
693
694 switch (csk->state) {
695 case CTP_ESTABLISHED:
696 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
697 break;
698 case CTP_ACTIVE_CLOSE:
699 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
700 break;
701 case CTP_CLOSE_WAIT_1:
702 cxgbi_sock_closed(csk);
703 break;
704 case CTP_ABORTING:
705 break;
706 default:
707 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
708 csk, csk->state, csk->flags, csk->tid);
709 }
710 cxgbi_inform_iscsi_conn_closing(csk);
711done:
712 spin_unlock_bh(&csk->lock);
713 cxgbi_sock_put(csk);
714}
715EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
716
717void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
718{
719 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
720 csk, (csk)->state, (csk)->flags, (csk)->tid);
721 cxgbi_sock_get(csk);
722 spin_lock_bh(&csk->lock);
723
724 csk->snd_una = snd_nxt - 1;
725 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
726 goto done;
727
728 switch (csk->state) {
729 case CTP_ACTIVE_CLOSE:
730 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
731 break;
732 case CTP_CLOSE_WAIT_1:
733 case CTP_CLOSE_WAIT_2:
734 cxgbi_sock_closed(csk);
735 break;
736 case CTP_ABORTING:
737 break;
738 default:
739 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
740 csk, csk->state, csk->flags, csk->tid);
741 }
742done:
743 spin_unlock_bh(&csk->lock);
744 cxgbi_sock_put(csk);
745}
746EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
747
748void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
749 unsigned int snd_una, int seq_chk)
750{
751 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
752 "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
753 csk, csk->state, csk->flags, csk->tid, credits,
754 csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
755
756 spin_lock_bh(&csk->lock);
757
758 csk->wr_cred += credits;
759 if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
760 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
761
762 while (credits) {
763 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
764
765 if (unlikely(!p)) {
766 pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
767 csk, csk->state, csk->flags, csk->tid, credits,
768 csk->wr_cred, csk->wr_una_cred);
769 break;
770 }
771
772 if (unlikely(credits < p->csum)) {
773 pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
774 csk, csk->state, csk->flags, csk->tid,
775 credits, csk->wr_cred, csk->wr_una_cred,
776 p->csum);
777 p->csum -= credits;
778 break;
779 } else {
780 cxgbi_sock_dequeue_wr(csk);
781 credits -= p->csum;
782 kfree_skb(p);
783 }
784 }
785
786 cxgbi_sock_check_wr_invariants(csk);
787
788 if (seq_chk) {
789 if (unlikely(before(snd_una, csk->snd_una))) {
790 pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
791 csk, csk->state, csk->flags, csk->tid, snd_una,
792 csk->snd_una);
793 goto done;
794 }
795
796 if (csk->snd_una != snd_una) {
797 csk->snd_una = snd_una;
798 dst_confirm(csk->dst);
799 }
800 }
801
802 if (skb_queue_len(&csk->write_queue)) {
803 if (csk->cdev->csk_push_tx_frames(csk, 0))
804 cxgbi_conn_tx_open(csk);
805 } else
806 cxgbi_conn_tx_open(csk);
807done:
808 spin_unlock_bh(&csk->lock);
809}
810EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
811
812static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
813 unsigned short mtu)
814{
815 int i = 0;
816
817 while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
818 ++i;
819
820 return i;
821}
822
823unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
824{
825 unsigned int idx;
826 struct dst_entry *dst = csk->dst;
827
0dbaee3b 828 csk->advmss = dst_metric_advmss(dst);
9ba682f0 829
830 if (csk->advmss > pmtu - 40)
831 csk->advmss = pmtu - 40;
832 if (csk->advmss < csk->cdev->mtus[0] - 40)
833 csk->advmss = csk->cdev->mtus[0] - 40;
834 idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
835
836 return idx;
837}
838EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
839
840void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
841{
842 cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
843 __skb_queue_tail(&csk->write_queue, skb);
844}
845EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
846
847void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
848{
849 struct sk_buff *skb;
850
851 while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
852 kfree_skb(skb);
853}
854EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
855
856void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
857{
858 int pending = cxgbi_sock_count_pending_wrs(csk);
859
860 if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
861 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
862 csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
863}
864EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
865
866static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
867{
868 struct cxgbi_device *cdev = csk->cdev;
869 struct sk_buff *next;
870 int err, copied = 0;
871
872 spin_lock_bh(&csk->lock);
873
874 if (csk->state != CTP_ESTABLISHED) {
875 log_debug(1 << CXGBI_DBG_PDU_TX,
876 "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
877 csk, csk->state, csk->flags, csk->tid);
878 err = -EAGAIN;
879 goto out_err;
880 }
881
882 if (csk->err) {
883 log_debug(1 << CXGBI_DBG_PDU_TX,
884 "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
885 csk, csk->state, csk->flags, csk->tid, csk->err);
886 err = -EPIPE;
887 goto out_err;
888 }
889
890 if (csk->write_seq - csk->snd_una >= cdev->snd_win) {
891 log_debug(1 << CXGBI_DBG_PDU_TX,
892 "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
893 csk, csk->state, csk->flags, csk->tid, csk->write_seq,
894 csk->snd_una, cdev->snd_win);
895 err = -ENOBUFS;
896 goto out_err;
897 }
898
899 while (skb) {
900 int frags = skb_shinfo(skb)->nr_frags +
901 (skb->len != skb->data_len);
902
903 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
904 pr_err("csk 0x%p, skb head %u < %u.\n",
905 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
906 err = -EINVAL;
907 goto out_err;
908 }
909
910 if (frags >= SKB_WR_LIST_SIZE) {
911 pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
912 csk, skb_shinfo(skb)->nr_frags, skb->len,
913 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
914 err = -EINVAL;
915 goto out_err;
916 }
917
918 next = skb->next;
919 skb->next = NULL;
920 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
921 cxgbi_sock_skb_entail(csk, skb);
922 copied += skb->len;
923 csk->write_seq += skb->len +
924 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
925 skb = next;
926 }
927done:
928 if (likely(skb_queue_len(&csk->write_queue)))
929 cdev->csk_push_tx_frames(csk, 1);
930 spin_unlock_bh(&csk->lock);
931 return copied;
932
933out_err:
934 if (copied == 0 && err == -EPIPE)
935 copied = csk->err ? csk->err : -EPIPE;
936 else
937 copied = err;
938 goto done;
939}
940
941/*
942 * Direct Data Placement -
943 * Directly place the iSCSI Data-In or Data-Out PDU's payload into pre-posted
944 * final destination host-memory buffers based on the Initiator Task Tag (ITT)
945 * in Data-In or Target Task Tag (TTT) in Data-Out PDUs.
946 * The host memory address is programmed into h/w in the format of pagepod
947 * entries.
948 * The location of the pagepod entry is encoded into ddp tag which is used as
949 * the base for ITT/TTT.
950 */
951
952static unsigned char ddp_page_order[DDP_PGIDX_MAX] = {0, 1, 2, 4};
953static unsigned char ddp_page_shift[DDP_PGIDX_MAX] = {12, 13, 14, 16};
954static unsigned char page_idx = DDP_PGIDX_MAX;
955
956static unsigned char sw_tag_idx_bits;
957static unsigned char sw_tag_age_bits;
958
959/*
960 * Direct-Data Placement page size adjustment
961 */
962static int ddp_adjust_page_table(void)
963{
964 int i;
965 unsigned int base_order, order;
966
967 if (PAGE_SIZE < (1UL << ddp_page_shift[0])) {
968 pr_info("PAGE_SIZE 0x%lx too small, min 0x%lx\n",
969 PAGE_SIZE, 1UL << ddp_page_shift[0]);
970 return -EINVAL;
971 }
972
973 base_order = get_order(1UL << ddp_page_shift[0]);
974 order = get_order(1UL << PAGE_SHIFT);
975
976 for (i = 0; i < DDP_PGIDX_MAX; i++) {
977 /* first is the kernel page size, then just doubling */
978 ddp_page_order[i] = order - base_order + i;
979 ddp_page_shift[i] = PAGE_SHIFT + i;
980 }
981 return 0;
982}
983
984static int ddp_find_page_index(unsigned long pgsz)
985{
986 int i;
987
988 for (i = 0; i < DDP_PGIDX_MAX; i++) {
989 if (pgsz == (1UL << ddp_page_shift[i]))
990 return i;
991 }
992 pr_info("ddp page size %lu not supported.\n", pgsz);
993 return DDP_PGIDX_MAX;
994}
995
996static void ddp_setup_host_page_size(void)
997{
998 if (page_idx == DDP_PGIDX_MAX) {
999 page_idx = ddp_find_page_index(PAGE_SIZE);
1000
1001 if (page_idx == DDP_PGIDX_MAX) {
1002 pr_info("system PAGE %lu, update hw.\n", PAGE_SIZE);
1003 if (ddp_adjust_page_table() < 0) {
1004 pr_info("PAGE %lu, disable ddp.\n", PAGE_SIZE);
1005 return;
1006 }
1007 page_idx = ddp_find_page_index(PAGE_SIZE);
1008 }
1009 pr_info("system PAGE %lu, ddp idx %u.\n", PAGE_SIZE, page_idx);
1010 }
1011}
1012
1013void cxgbi_ddp_page_size_factor(int *pgsz_factor)
1014{
1015 int i;
1016
1017 for (i = 0; i < DDP_PGIDX_MAX; i++)
1018 pgsz_factor[i] = ddp_page_order[i];
1019}
1020EXPORT_SYMBOL_GPL(cxgbi_ddp_page_size_factor);
1021
1022/*
1023 * DDP setup & teardown
1024 */
1025
1026void cxgbi_ddp_ppod_set(struct cxgbi_pagepod *ppod,
1027 struct cxgbi_pagepod_hdr *hdr,
1028 struct cxgbi_gather_list *gl, unsigned int gidx)
1029{
1030 int i;
1031
1032 memcpy(ppod, hdr, sizeof(*hdr));
1033 for (i = 0; i < (PPOD_PAGES_MAX + 1); i++, gidx++) {
1034 ppod->addr[i] = gidx < gl->nelem ?
1035 cpu_to_be64(gl->phys_addr[gidx]) : 0ULL;
1036 }
1037}
1038EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_set);
1039
1040void cxgbi_ddp_ppod_clear(struct cxgbi_pagepod *ppod)
1041{
1042 memset(ppod, 0, sizeof(*ppod));
1043}
1044EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_clear);
1045
1046static inline int ddp_find_unused_entries(struct cxgbi_ddp_info *ddp,
1047 unsigned int start, unsigned int max,
1048 unsigned int count,
1049 struct cxgbi_gather_list *gl)
1050{
1051 unsigned int i, j, k;
1052
1053 /* not enough entries */
1054 if ((max - start) < count) {
1055 log_debug(1 << CXGBI_DBG_DDP,
1056 "NOT enough entries %u+%u < %u.\n", start, count, max);
1057 return -EBUSY;
1058 }
1059
1060 max -= count;
1061 spin_lock(&ddp->map_lock);
1062 for (i = start; i < max;) {
1063 for (j = 0, k = i; j < count; j++, k++) {
1064 if (ddp->gl_map[k])
1065 break;
1066 }
1067 if (j == count) {
1068 for (j = 0, k = i; j < count; j++, k++)
1069 ddp->gl_map[k] = gl;
1070 spin_unlock(&ddp->map_lock);
1071 return i;
1072 }
1073 i += j + 1;
1074 }
1075 spin_unlock(&ddp->map_lock);
1076 log_debug(1 << CXGBI_DBG_DDP,
1077 "NO suitable entries %u available.\n", count);
1078 return -EBUSY;
1079}
1080
1081static inline void ddp_unmark_entries(struct cxgbi_ddp_info *ddp,
1082 int start, int count)
1083{
1084 spin_lock(&ddp->map_lock);
1085 memset(&ddp->gl_map[start], 0,
1086 count * sizeof(struct cxgbi_gather_list *));
1087 spin_unlock(&ddp->map_lock);
1088}
1089
1090static inline void ddp_gl_unmap(struct pci_dev *pdev,
1091 struct cxgbi_gather_list *gl)
1092{
1093 int i;
1094
1095 for (i = 0; i < gl->nelem; i++)
1096 dma_unmap_page(&pdev->dev, gl->phys_addr[i], PAGE_SIZE,
1097 PCI_DMA_FROMDEVICE);
1098}
1099
1100static inline int ddp_gl_map(struct pci_dev *pdev,
1101 struct cxgbi_gather_list *gl)
1102{
1103 int i;
1104
1105 for (i = 0; i < gl->nelem; i++) {
1106 gl->phys_addr[i] = dma_map_page(&pdev->dev, gl->pages[i], 0,
1107 PAGE_SIZE,
1108 PCI_DMA_FROMDEVICE);
1109 if (unlikely(dma_mapping_error(&pdev->dev, gl->phys_addr[i]))) {
1110 log_debug(1 << CXGBI_DBG_DDP,
1111 "page %d 0x%p, 0x%p dma mapping err.\n",
1112 i, gl->pages[i], pdev);
1113 goto unmap;
1114 }
1115 }
1116 return i;
1117unmap:
1118 if (i) {
1119 unsigned int nelem = gl->nelem;
1120
1121 gl->nelem = i;
1122 ddp_gl_unmap(pdev, gl);
1123 gl->nelem = nelem;
1124 }
1125 return -EINVAL;
1126}
1127
1128static void ddp_release_gl(struct cxgbi_gather_list *gl,
1129 struct pci_dev *pdev)
1130{
1131 ddp_gl_unmap(pdev, gl);
1132 kfree(gl);
1133}
1134
1135static struct cxgbi_gather_list *ddp_make_gl(unsigned int xferlen,
1136 struct scatterlist *sgl,
1137 unsigned int sgcnt,
1138 struct pci_dev *pdev,
1139 gfp_t gfp)
1140{
1141 struct cxgbi_gather_list *gl;
1142 struct scatterlist *sg = sgl;
1143 struct page *sgpage = sg_page(sg);
1144 unsigned int sglen = sg->length;
1145 unsigned int sgoffset = sg->offset;
1146 unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >>
1147 PAGE_SHIFT;
1148 int i = 1, j = 0;
1149
1150 if (xferlen < DDP_THRESHOLD) {
1151 log_debug(1 << CXGBI_DBG_DDP,
1152 "xfer %u < threshold %u, no ddp.\n",
1153 xferlen, DDP_THRESHOLD);
1154 return NULL;
1155 }
1156
1157 gl = kzalloc(sizeof(struct cxgbi_gather_list) +
1158 npages * (sizeof(dma_addr_t) +
1159 sizeof(struct page *)), gfp);
1160 if (!gl) {
1161 log_debug(1 << CXGBI_DBG_DDP,
1162 "xfer %u, %u pages, OOM.\n", xferlen, npages);
1163 return NULL;
1164 }
1165
1166 log_debug(1 << CXGBI_DBG_DDP,
1167 "xfer %u, sgl %u, gl max %u.\n", xferlen, sgcnt, npages);
1168
1169 gl->pages = (struct page **)&gl->phys_addr[npages];
1170 gl->nelem = npages;
1171 gl->length = xferlen;
1172 gl->offset = sgoffset;
1173 gl->pages[0] = sgpage;
1174
1175 for (i = 1, sg = sg_next(sgl), j = 0; i < sgcnt;
1176 i++, sg = sg_next(sg)) {
1177 struct page *page = sg_page(sg);
1178
1179 if (sgpage == page && sg->offset == sgoffset + sglen)
1180 sglen += sg->length;
1181 else {
1182 /* make sure the sgl is fit for ddp:
1183 * each has the same page size, and
1184 * all of the middle pages are used completely
1185 */
1186 if ((j && sgoffset) || ((i != sgcnt - 1) &&
1187 ((sglen + sgoffset) & ~PAGE_MASK))) {
1188 log_debug(1 << CXGBI_DBG_DDP,
1189 "page %d/%u, %u + %u.\n",
1190 i, sgcnt, sgoffset, sglen);
1191 goto error_out;
1192 }
1193
1194 j++;
1195 if (j == gl->nelem || sg->offset) {
1196 log_debug(1 << CXGBI_DBG_DDP,
1197 "page %d/%u, offset %u.\n",
1198 j, gl->nelem, sg->offset);
1199 goto error_out;
1200 }
1201 gl->pages[j] = page;
1202 sglen = sg->length;
1203 sgoffset = sg->offset;
1204 sgpage = page;
1205 }
1206 }
1207 gl->nelem = ++j;
1208
1209 if (ddp_gl_map(pdev, gl) < 0)
1210 goto error_out;
1211
1212 return gl;
1213
1214error_out:
1215 kfree(gl);
1216 return NULL;
1217}
1218
1219static void ddp_tag_release(struct cxgbi_hba *chba, u32 tag)
1220{
1221 struct cxgbi_device *cdev = chba->cdev;
1222 struct cxgbi_ddp_info *ddp = cdev->ddp;
1223 u32 idx;
1224
1225 idx = (tag >> PPOD_IDX_SHIFT) & ddp->idx_mask;
1226 if (idx < ddp->nppods) {
1227 struct cxgbi_gather_list *gl = ddp->gl_map[idx];
1228 unsigned int npods;
1229
1230 if (!gl || !gl->nelem) {
1231 pr_warn("tag 0x%x, idx %u, gl 0x%p, %u.\n",
1232 tag, idx, gl, gl ? gl->nelem : 0);
1233 return;
1234 }
1235 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1236 log_debug(1 << CXGBI_DBG_DDP,
1237 "tag 0x%x, release idx %u, npods %u.\n",
1238 tag, idx, npods);
1239 cdev->csk_ddp_clear(chba, tag, idx, npods);
1240 ddp_unmark_entries(ddp, idx, npods);
1241 ddp_release_gl(gl, ddp->pdev);
1242 } else
1243 pr_warn("tag 0x%x, idx %u > max %u.\n", tag, idx, ddp->nppods);
1244}
1245
1246static int ddp_tag_reserve(struct cxgbi_sock *csk, unsigned int tid,
1247 u32 sw_tag, u32 *tagp, struct cxgbi_gather_list *gl,
1248 gfp_t gfp)
1249{
1250 struct cxgbi_device *cdev = csk->cdev;
1251 struct cxgbi_ddp_info *ddp = cdev->ddp;
1252 struct cxgbi_tag_format *tformat = &cdev->tag_format;
1253 struct cxgbi_pagepod_hdr hdr;
1254 unsigned int npods;
1255 int idx = -1;
1256 int err = -ENOMEM;
1257 u32 tag;
1258
1259 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1260 if (ddp->idx_last == ddp->nppods)
1261 idx = ddp_find_unused_entries(ddp, 0, ddp->nppods,
1262 npods, gl);
1263 else {
1264 idx = ddp_find_unused_entries(ddp, ddp->idx_last + 1,
1265 ddp->nppods, npods,
1266 gl);
1267 if (idx < 0 && ddp->idx_last >= npods) {
1268 idx = ddp_find_unused_entries(ddp, 0,
1269 min(ddp->idx_last + npods, ddp->nppods),
1270 npods, gl);
1271 }
1272 }
1273 if (idx < 0) {
1274 log_debug(1 << CXGBI_DBG_DDP,
1275 "xferlen %u, gl %u, npods %u NO DDP.\n",
1276 gl->length, gl->nelem, npods);
1277 return idx;
1278 }
1279
9ba682f0 1280 tag = cxgbi_ddp_tag_base(tformat, sw_tag);
1281 tag |= idx << PPOD_IDX_SHIFT;
1282
1283 hdr.rsvd = 0;
1284 hdr.vld_tid = htonl(PPOD_VALID_FLAG | PPOD_TID(tid));
1285 hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask);
1286 hdr.max_offset = htonl(gl->length);
1287 hdr.page_offset = htonl(gl->offset);
1288
1289 err = cdev->csk_ddp_set(csk, &hdr, idx, npods, gl);
b8ce8b59 1290 if (err < 0)
9ba682f0 1291 goto unmark_entries;
9ba682f0 1292
1293 ddp->idx_last = idx;
1294 log_debug(1 << CXGBI_DBG_DDP,
1295 "xfer %u, gl %u,%u, tid 0x%x, tag 0x%x->0x%x(%u,%u).\n",
1296 gl->length, gl->nelem, gl->offset, tid, sw_tag, tag, idx,
1297 npods);
1298 *tagp = tag;
1299 return 0;
1300
1301unmark_entries:
1302 ddp_unmark_entries(ddp, idx, npods);
1303 return err;
1304}
1305
1306int cxgbi_ddp_reserve(struct cxgbi_sock *csk, unsigned int *tagp,
1307 unsigned int sw_tag, unsigned int xferlen,
1308 struct scatterlist *sgl, unsigned int sgcnt, gfp_t gfp)
1309{
1310 struct cxgbi_device *cdev = csk->cdev;
1311 struct cxgbi_tag_format *tformat = &cdev->tag_format;
1312 struct cxgbi_gather_list *gl;
1313 int err;
1314
1315 if (page_idx >= DDP_PGIDX_MAX || !cdev->ddp ||
1316 xferlen < DDP_THRESHOLD) {
1317 log_debug(1 << CXGBI_DBG_DDP,
1318 "pgidx %u, xfer %u, NO ddp.\n", page_idx, xferlen);
1319 return -EINVAL;
1320 }
1321
1322 if (!cxgbi_sw_tag_usable(tformat, sw_tag)) {
1323 log_debug(1 << CXGBI_DBG_DDP,
1324 "sw_tag 0x%x NOT usable.\n", sw_tag);
1325 return -EINVAL;
1326 }
1327
1328 gl = ddp_make_gl(xferlen, sgl, sgcnt, cdev->pdev, gfp);
1329 if (!gl)
1330 return -ENOMEM;
1331
1332 err = ddp_tag_reserve(csk, csk->tid, sw_tag, tagp, gl, gfp);
1333 if (err < 0)
1334 ddp_release_gl(gl, cdev->pdev);
1335
1336 return err;
1337}
1338
1339static void ddp_destroy(struct kref *kref)
1340{
1341 struct cxgbi_ddp_info *ddp = container_of(kref,
1342 struct cxgbi_ddp_info,
1343 refcnt);
1344 struct cxgbi_device *cdev = ddp->cdev;
1345 int i = 0;
1346
1347 pr_info("kref 0, destroy ddp 0x%p, cdev 0x%p.\n", ddp, cdev);
1348
1349 while (i < ddp->nppods) {
1350 struct cxgbi_gather_list *gl = ddp->gl_map[i];
1351
1352 if (gl) {
1353 int npods = (gl->nelem + PPOD_PAGES_MAX - 1)
1354 >> PPOD_PAGES_SHIFT;
1355 pr_info("cdev 0x%p, ddp %d + %d.\n", cdev, i, npods);
1356 kfree(gl);
9ba682f0 1357 i += npods;
1358 } else
1359 i++;
1360 }
1361 cxgbi_free_big_mem(ddp);
1362}
1363
1364int cxgbi_ddp_cleanup(struct cxgbi_device *cdev)
1365{
1366 struct cxgbi_ddp_info *ddp = cdev->ddp;
1367
1368 log_debug(1 << CXGBI_DBG_DDP,
1369 "cdev 0x%p, release ddp 0x%p.\n", cdev, ddp);
1370 cdev->ddp = NULL;
1371 if (ddp)
1372 return kref_put(&ddp->refcnt, ddp_destroy);
1373 return 0;
1374}
1375EXPORT_SYMBOL_GPL(cxgbi_ddp_cleanup);
1376
1377int cxgbi_ddp_init(struct cxgbi_device *cdev,
1378 unsigned int llimit, unsigned int ulimit,
1379 unsigned int max_txsz, unsigned int max_rxsz)
1380{
1381 struct cxgbi_ddp_info *ddp;
1382 unsigned int ppmax, bits;
1383
1384 ppmax = (ulimit - llimit + 1) >> PPOD_SIZE_SHIFT;
1385 bits = __ilog2_u32(ppmax) + 1;
1386 if (bits > PPOD_IDX_MAX_SIZE)
1387 bits = PPOD_IDX_MAX_SIZE;
1388 ppmax = (1 << (bits - 1)) - 1;
1389
1390 ddp = cxgbi_alloc_big_mem(sizeof(struct cxgbi_ddp_info) +
1391 ppmax * (sizeof(struct cxgbi_gather_list *) +
1392 sizeof(struct sk_buff *)),
1393 GFP_KERNEL);
1394 if (!ddp) {
1395 pr_warn("cdev 0x%p, ddp ppmax %u OOM.\n", cdev, ppmax);
1396 return -ENOMEM;
1397 }
1398 ddp->gl_map = (struct cxgbi_gather_list **)(ddp + 1);
9ba682f0 1399 cdev->ddp = ddp;
1400
1401 spin_lock_init(&ddp->map_lock);
1402 kref_init(&ddp->refcnt);
1403
1404 ddp->cdev = cdev;
1405 ddp->pdev = cdev->pdev;
1406 ddp->llimit = llimit;
1407 ddp->ulimit = ulimit;
1408 ddp->max_txsz = min_t(unsigned int, max_txsz, ULP2_MAX_PKT_SIZE);
1409 ddp->max_rxsz = min_t(unsigned int, max_rxsz, ULP2_MAX_PKT_SIZE);
1410 ddp->nppods = ppmax;
1411 ddp->idx_last = ppmax;
1412 ddp->idx_bits = bits;
1413 ddp->idx_mask = (1 << bits) - 1;
1414 ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1;
1415
1416 cdev->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
1417 cdev->tag_format.rsvd_bits = ddp->idx_bits;
1418 cdev->tag_format.rsvd_shift = PPOD_IDX_SHIFT;
1419 cdev->tag_format.rsvd_mask = (1 << cdev->tag_format.rsvd_bits) - 1;
1420
1421 pr_info("%s tag format, sw %u, rsvd %u,%u, mask 0x%x.\n",
1422 cdev->ports[0]->name, cdev->tag_format.sw_bits,
1423 cdev->tag_format.rsvd_bits, cdev->tag_format.rsvd_shift,
1424 cdev->tag_format.rsvd_mask);
1425
1426 cdev->tx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1427 ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
1428 cdev->rx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1429 ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);
1430
1431 log_debug(1 << CXGBI_DBG_DDP,
1432 "%s max payload size: %u/%u, %u/%u.\n",
1433 cdev->ports[0]->name, cdev->tx_max_size, ddp->max_txsz,
1434 cdev->rx_max_size, ddp->max_rxsz);
1435 return 0;
1436}
1437EXPORT_SYMBOL_GPL(cxgbi_ddp_init);
1438
1439/*
1440 * APIs interacting with open-iscsi libraries
1441 */
1442
1443static unsigned char padding[4];
1444
1445static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1446{
1447 struct scsi_cmnd *sc = task->sc;
1448 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1449 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1450 struct cxgbi_hba *chba = cconn->chba;
1451 struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1452 u32 tag = ntohl((__force u32)hdr_itt);
1453
1454 log_debug(1 << CXGBI_DBG_DDP,
1455 "cdev 0x%p, release tag 0x%x.\n", chba->cdev, tag);
1456 if (sc &&
1457 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
1458 cxgbi_is_ddp_tag(tformat, tag))
1459 ddp_tag_release(chba, tag);
1460}
1461
1462static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1463{
1464 struct scsi_cmnd *sc = task->sc;
1465 struct iscsi_conn *conn = task->conn;
1466 struct iscsi_session *sess = conn->session;
1467 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1468 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1469 struct cxgbi_hba *chba = cconn->chba;
1470 struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1471 u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
1472 u32 tag = 0;
1473 int err = -EINVAL;
1474
1475 if (sc &&
1476 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)) {
1477 err = cxgbi_ddp_reserve(cconn->cep->csk, &tag, sw_tag,
1478 scsi_in(sc)->length,
1479 scsi_in(sc)->table.sgl,
1480 scsi_in(sc)->table.nents,
1481 GFP_ATOMIC);
1482 if (err < 0)
1483 log_debug(1 << CXGBI_DBG_DDP,
1484 "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1485 cconn->cep->csk, task, scsi_in(sc)->length,
1486 scsi_in(sc)->table.nents);
1487 }
1488
1489 if (err < 0)
1490 tag = cxgbi_set_non_ddp_tag(tformat, sw_tag);
1491 /* the itt need to sent in big-endian order */
1492 *hdr_itt = (__force itt_t)htonl(tag);
1493
1494 log_debug(1 << CXGBI_DBG_DDP,
1495 "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1496 chba->cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1497 return 0;
1498}
1499
1500void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1501{
1502 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1503 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1504 struct cxgbi_device *cdev = cconn->chba->cdev;
1505 u32 tag = ntohl((__force u32) itt);
1506 u32 sw_bits;
1507
1508 sw_bits = cxgbi_tag_nonrsvd_bits(&cdev->tag_format, tag);
1509 if (idx)
1510 *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
1511 if (age)
1512 *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
1513
1514 log_debug(1 << CXGBI_DBG_DDP,
1515 "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1516 cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1517 age ? *age : 0xFF);
1518}
1519EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1520
1521void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1522{
1523 struct iscsi_conn *conn = csk->user_data;
1524
1525 if (conn) {
1526 log_debug(1 << CXGBI_DBG_SOCK,
1527 "csk 0x%p, cid %d.\n", csk, conn->id);
1528 iscsi_conn_queue_work(conn);
1529 }
1530}
1531EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1532
1533/*
1534 * pdu receive, interact with libiscsi_tcp
1535 */
1536static inline int read_pdu_skb(struct iscsi_conn *conn,
1537 struct sk_buff *skb,
1538 unsigned int offset,
1539 int offloaded)
1540{
1541 int status = 0;
1542 int bytes_read;
1543
1544 bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1545 switch (status) {
1546 case ISCSI_TCP_CONN_ERR:
1547 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1548 skb, offset, offloaded);
1549 return -EIO;
1550 case ISCSI_TCP_SUSPENDED:
1551 log_debug(1 << CXGBI_DBG_PDU_RX,
1552 "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1553 skb, offset, offloaded, bytes_read);
1554 /* no transfer - just have caller flush queue */
1555 return bytes_read;
1556 case ISCSI_TCP_SKB_DONE:
1557 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1558 skb, offset, offloaded);
1559 /*
1560 * pdus should always fit in the skb and we should get
1561 * segment done notifcation.
1562 */
1563 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1564 return -EFAULT;
1565 case ISCSI_TCP_SEGMENT_DONE:
1566 log_debug(1 << CXGBI_DBG_PDU_RX,
1567 "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1568 skb, offset, offloaded, bytes_read);
1569 return bytes_read;
1570 default:
1571 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1572 skb, offset, offloaded, status);
1573 return -EINVAL;
1574 }
1575}
1576
1577static int skb_read_pdu_bhs(struct iscsi_conn *conn, struct sk_buff *skb)
1578{
1579 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1580
1581 log_debug(1 << CXGBI_DBG_PDU_RX,
1582 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1583 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1584
1585 if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1586 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1587 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1588 return -EIO;
1589 }
1590
1591 if (conn->hdrdgst_en &&
1592 cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1593 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1594 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1595 return -EIO;
1596 }
1597
1598 return read_pdu_skb(conn, skb, 0, 0);
1599}
1600
1601static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1602 struct sk_buff *skb, unsigned int offset)
1603{
1604 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1605 bool offloaded = 0;
1606 int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1607
1608 log_debug(1 << CXGBI_DBG_PDU_RX,
1609 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1610 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1611
1612 if (conn->datadgst_en &&
1613 cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1614 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1615 conn, lskb, cxgbi_skcb_flags(lskb));
1616 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1617 return -EIO;
1618 }
1619
1620 if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1621 return 0;
1622
1623 /* coalesced, add header digest length */
1624 if (lskb == skb && conn->hdrdgst_en)
1625 offset += ISCSI_DIGEST_SIZE;
1626
1627 if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1628 offloaded = 1;
1629
1630 if (opcode == ISCSI_OP_SCSI_DATA_IN)
1631 log_debug(1 << CXGBI_DBG_PDU_RX,
1632 "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1633 skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1634 tcp_conn->in.datalen, offloaded ? "is" : "not");
1635
1636 return read_pdu_skb(conn, skb, offset, offloaded);
1637}
1638
1639static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1640{
1641 struct cxgbi_device *cdev = csk->cdev;
1642 int must_send;
1643 u32 credits;
1644
1645 log_debug(1 << CXGBI_DBG_PDU_RX,
1646 "csk 0x%p,%u,0x%lu,%u, seq %u, wup %u, thre %u, %u.\n",
1647 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1648 csk->rcv_wup, cdev->rx_credit_thres,
1649 cdev->rcv_win);
1650
1651 if (csk->state != CTP_ESTABLISHED)
1652 return;
1653
1654 credits = csk->copied_seq - csk->rcv_wup;
1655 if (unlikely(!credits))
1656 return;
1657 if (unlikely(cdev->rx_credit_thres == 0))
1658 return;
1659
1660 must_send = credits + 16384 >= cdev->rcv_win;
1661 if (must_send || credits >= cdev->rx_credit_thres)
1662 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1663}
1664
1665void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1666{
1667 struct cxgbi_device *cdev = csk->cdev;
1668 struct iscsi_conn *conn = csk->user_data;
1669 struct sk_buff *skb;
1670 unsigned int read = 0;
1671 int err = 0;
1672
1673 log_debug(1 << CXGBI_DBG_PDU_RX,
1674 "csk 0x%p, conn 0x%p.\n", csk, conn);
1675
1676 if (unlikely(!conn || conn->suspend_rx)) {
1677 log_debug(1 << CXGBI_DBG_PDU_RX,
1678 "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1679 csk, conn, conn ? conn->id : 0xFF,
1680 conn ? conn->suspend_rx : 0xFF);
9ba682f0 1681 return;
1682 }
1683
1684 while (!err) {
9ba682f0 1685 skb = skb_peek(&csk->receive_queue);
1686 if (!skb ||
1687 !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1688 if (skb)
1689 log_debug(1 << CXGBI_DBG_PDU_RX,
1690 "skb 0x%p, NOT ready 0x%lx.\n",
1691 skb, cxgbi_skcb_flags(skb));
9ba682f0 1692 break;
1693 }
1694 __skb_unlink(skb, &csk->receive_queue);
9ba682f0 1695
1696 read += cxgbi_skcb_rx_pdulen(skb);
1697 log_debug(1 << CXGBI_DBG_PDU_RX,
1698 "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1699 csk, skb, skb->len, cxgbi_skcb_flags(skb),
1700 cxgbi_skcb_rx_pdulen(skb));
1701
1702 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1703 err = skb_read_pdu_bhs(conn, skb);
e3d2ad8c 1704 if (err < 0) {
1705 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1706 "f 0x%lx, plen %u.\n",
1707 csk, skb, skb->len,
1708 cxgbi_skcb_flags(skb),
1709 cxgbi_skcb_rx_pdulen(skb));
1710 goto skb_done;
1711 }
9ba682f0 1712 err = skb_read_pdu_data(conn, skb, skb,
1713 err + cdev->skb_rx_extra);
e3d2ad8c 1714 if (err < 0)
1715 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1716 "f 0x%lx, plen %u.\n",
1717 csk, skb, skb->len,
1718 cxgbi_skcb_flags(skb),
1719 cxgbi_skcb_rx_pdulen(skb));
9ba682f0 1720 } else {
1721 err = skb_read_pdu_bhs(conn, skb);
e3d2ad8c 1722 if (err < 0) {
1723 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1724 "f 0x%lx, plen %u.\n",
1725 csk, skb, skb->len,
1726 cxgbi_skcb_flags(skb),
1727 cxgbi_skcb_rx_pdulen(skb));
1728 goto skb_done;
1729 }
1730
9ba682f0 1731 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1732 struct sk_buff *dskb;
1733
9ba682f0 1734 dskb = skb_peek(&csk->receive_queue);
1735 if (!dskb) {
e3d2ad8c 1736 pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1737 " plen %u, NO data.\n",
1738 csk, skb, skb->len,
1739 cxgbi_skcb_flags(skb),
1740 cxgbi_skcb_rx_pdulen(skb));
1741 err = -EIO;
1742 goto skb_done;
9ba682f0 1743 }
1744 __skb_unlink(dskb, &csk->receive_queue);
9ba682f0 1745
1746 err = skb_read_pdu_data(conn, skb, dskb, 0);
e3d2ad8c 1747 if (err < 0)
1748 pr_err("data, csk 0x%p, skb 0x%p,%u, "
1749 "f 0x%lx, plen %u, dskb 0x%p,"
1750 "%u.\n",
1751 csk, skb, skb->len,
1752 cxgbi_skcb_flags(skb),
1753 cxgbi_skcb_rx_pdulen(skb),
1754 dskb, dskb->len);
9ba682f0 1755 __kfree_skb(dskb);
1756 } else
1757 err = skb_read_pdu_data(conn, skb, skb, 0);
1758 }
e3d2ad8c 1759skb_done:
1760 __kfree_skb(skb);
1761
9ba682f0 1762 if (err < 0)
1763 break;
9ba682f0 1764 }
1765
1766 log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
1767 if (read) {
1768 csk->copied_seq += read;
1769 csk_return_rx_credits(csk, read);
1770 conn->rxdata_octets += read;
1771 }
1772
1773 if (err < 0) {
e3d2ad8c 1774 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
1775 csk, conn, err, read);
9ba682f0 1776 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1777 }
1778}
1779EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
1780
1781static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
1782 unsigned int offset, unsigned int *off,
1783 struct scatterlist **sgp)
1784{
1785 int i;
1786 struct scatterlist *sg;
1787
1788 for_each_sg(sgl, sg, sgcnt, i) {
1789 if (offset < sg->length) {
1790 *off = offset;
1791 *sgp = sg;
1792 return 0;
1793 }
1794 offset -= sg->length;
1795 }
1796 return -EFAULT;
1797}
1798
1799static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
1800 unsigned int dlen, skb_frag_t *frags,
1801 int frag_max)
1802{
1803 unsigned int datalen = dlen;
1804 unsigned int sglen = sg->length - sgoffset;
1805 struct page *page = sg_page(sg);
1806 int i;
1807
1808 i = 0;
1809 do {
1810 unsigned int copy;
1811
1812 if (!sglen) {
1813 sg = sg_next(sg);
1814 if (!sg) {
1815 pr_warn("sg %d NULL, len %u/%u.\n",
1816 i, datalen, dlen);
1817 return -EINVAL;
1818 }
1819 sgoffset = 0;
1820 sglen = sg->length;
1821 page = sg_page(sg);
1822
1823 }
1824 copy = min(datalen, sglen);
1825 if (i && page == frags[i - 1].page &&
1826 sgoffset + sg->offset ==
1827 frags[i - 1].page_offset + frags[i - 1].size) {
1828 frags[i - 1].size += copy;
1829 } else {
1830 if (i >= frag_max) {
1831 pr_warn("too many pages %u, dlen %u.\n",
1832 frag_max, dlen);
1833 return -EINVAL;
1834 }
1835
1836 frags[i].page = page;
1837 frags[i].page_offset = sg->offset + sgoffset;
1838 frags[i].size = copy;
1839 i++;
1840 }
1841 datalen -= copy;
1842 sgoffset += copy;
1843 sglen -= copy;
1844 } while (datalen);
1845
1846 return i;
1847}
1848
1849int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
1850{
1851 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1852 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1853 struct cxgbi_device *cdev = cconn->chba->cdev;
1854 struct iscsi_conn *conn = task->conn;
1855 struct iscsi_tcp_task *tcp_task = task->dd_data;
e3d2ad8c 1856 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
9ba682f0 1857 struct scsi_cmnd *sc = task->sc;
1858 int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
1859
1860 tcp_task->dd_data = tdata;
1861 task->hdr = NULL;
1862
1863 if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
1864 (opcode == ISCSI_OP_SCSI_DATA_OUT ||
1865 (opcode == ISCSI_OP_SCSI_CMD &&
1866 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
1867 /* data could goes into skb head */
1868 headroom += min_t(unsigned int,
1869 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
1870 conn->max_xmit_dlength);
1871
1872 tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
1873 if (!tdata->skb) {
1874 pr_warn("alloc skb %u+%u, opcode 0x%x failed.\n",
1875 cdev->skb_tx_rsvd, headroom, opcode);
1876 return -ENOMEM;
1877 }
1878
1879 skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
1880 task->hdr = (struct iscsi_hdr *)tdata->skb->data;
1881 task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
1882
1883 /* data_out uses scsi_cmd's itt */
1884 if (opcode != ISCSI_OP_SCSI_DATA_OUT)
1885 task_reserve_itt(task, &task->hdr->itt);
1886
1887 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1888 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
1889 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
1890 conn->max_xmit_dlength, ntohl(task->hdr->itt));
1891
1892 return 0;
1893}
1894EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
1895
1896static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
1897{
c343a01c 1898 if (hcrc || dcrc) {
1899 u8 submode = 0;
1900
1901 if (hcrc)
1902 submode |= 1;
1903 if (dcrc)
1904 submode |= 2;
1905 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
1906 } else
1907 cxgbi_skcb_ulp_mode(skb) = 0;
9ba682f0 1908}
1909
1910int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
1911 unsigned int count)
1912{
1913 struct iscsi_conn *conn = task->conn;
e3d2ad8c 1914 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
9ba682f0 1915 struct sk_buff *skb = tdata->skb;
1916 unsigned int datalen = count;
1917 int i, padlen = iscsi_padding(count);
1918 struct page *pg;
1919
1920 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1921 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
1922 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
1923 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
1924
1925 skb_put(skb, task->hdr_len);
1926 tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
1927 if (!count)
1928 return 0;
1929
1930 if (task->sc) {
1931 struct scsi_data_buffer *sdb = scsi_out(task->sc);
1932 struct scatterlist *sg = NULL;
1933 int err;
1934
1935 tdata->offset = offset;
1936 tdata->count = count;
1937 err = sgl_seek_offset(
1938 sdb->table.sgl, sdb->table.nents,
1939 tdata->offset, &tdata->sgoffset, &sg);
1940 if (err < 0) {
1941 pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
1942 sdb->table.nents, tdata->offset, sdb->length);
1943 return err;
1944 }
1945 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
1946 tdata->frags, MAX_PDU_FRAGS);
1947 if (err < 0) {
1948 pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
1949 sdb->table.nents, tdata->offset, tdata->count);
1950 return err;
1951 }
1952 tdata->nr_frags = err;
1953
1954 if (tdata->nr_frags > MAX_SKB_FRAGS ||
1955 (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
1956 char *dst = skb->data + task->hdr_len;
1957 skb_frag_t *frag = tdata->frags;
1958
1959 /* data fits in the skb's headroom */
1960 for (i = 0; i < tdata->nr_frags; i++, frag++) {
1961 char *src = kmap_atomic(frag->page,
1962 KM_SOFTIRQ0);
1963
1964 memcpy(dst, src+frag->page_offset, frag->size);
1965 dst += frag->size;
1966 kunmap_atomic(src, KM_SOFTIRQ0);
1967 }
1968 if (padlen) {
1969 memset(dst, 0, padlen);
1970 padlen = 0;
1971 }
1972 skb_put(skb, count + padlen);
1973 } else {
1974 /* data fit into frag_list */
1975 for (i = 0; i < tdata->nr_frags; i++)
1976 get_page(tdata->frags[i].page);
1977
1978 memcpy(skb_shinfo(skb)->frags, tdata->frags,
1979 sizeof(skb_frag_t) * tdata->nr_frags);
1980 skb_shinfo(skb)->nr_frags = tdata->nr_frags;
1981 skb->len += count;
1982 skb->data_len += count;
1983 skb->truesize += count;
1984 }
1985
1986 } else {
1987 pg = virt_to_page(task->data);
1988
1989 get_page(pg);
1990 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
1991 count);
1992 skb->len += count;
1993 skb->data_len += count;
1994 skb->truesize += count;
1995 }
1996
1997 if (padlen) {
1998 i = skb_shinfo(skb)->nr_frags;
1999 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
2000 virt_to_page(padding), offset_in_page(padding),
2001 padlen);
2002
2003 skb->data_len += padlen;
2004 skb->truesize += padlen;
2005 skb->len += padlen;
2006 }
2007
2008 return 0;
2009}
2010EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
2011
2012int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2013{
2014 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2015 struct cxgbi_conn *cconn = tcp_conn->dd_data;
e3d2ad8c 2016 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
9ba682f0 2017 struct sk_buff *skb = tdata->skb;
2018 unsigned int datalen;
2019 int err;
2020
2021 if (!skb) {
2022 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2023 "task 0x%p, skb NULL.\n", task);
2024 return 0;
2025 }
2026
2027 datalen = skb->data_len;
2028 tdata->skb = NULL;
2029 err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2030 if (err > 0) {
2031 int pdulen = err;
2032
2033 log_debug(1 << CXGBI_DBG_PDU_TX,
2034 "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2035 task, task->sc, skb, skb->len, skb->data_len, err);
2036
2037 if (task->conn->hdrdgst_en)
2038 pdulen += ISCSI_DIGEST_SIZE;
2039
2040 if (datalen && task->conn->datadgst_en)
2041 pdulen += ISCSI_DIGEST_SIZE;
2042
2043 task->conn->txdata_octets += pdulen;
2044 return 0;
2045 }
2046
2047 if (err == -EAGAIN || err == -ENOBUFS) {
2048 log_debug(1 << CXGBI_DBG_PDU_TX,
2049 "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2050 task, skb, skb->len, skb->data_len, err);
2051 /* reset skb to send when we are called again */
2052 tdata->skb = skb;
2053 return err;
2054 }
2055
2056 kfree_skb(skb);
2057 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2058 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2059 task->itt, skb, skb->len, skb->data_len, err);
2060 iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2061 iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2062 return err;
2063}
2064EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2065
2066void cxgbi_cleanup_task(struct iscsi_task *task)
2067{
e3d2ad8c 2068 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
9ba682f0 2069
2070 log_debug(1 << CXGBI_DBG_ISCSI,
2071 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2072 task, tdata->skb, task->hdr_itt);
2073
2074 /* never reached the xmit task callout */
2075 if (tdata->skb)
2076 __kfree_skb(tdata->skb);
2077 memset(tdata, 0, sizeof(*tdata));
2078
2079 task_release_itt(task, task->hdr_itt);
2080 iscsi_tcp_cleanup_task(task);
2081}
2082EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2083
2084void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2085 struct iscsi_stats *stats)
2086{
2087 struct iscsi_conn *conn = cls_conn->dd_data;
2088
2089 stats->txdata_octets = conn->txdata_octets;
2090 stats->rxdata_octets = conn->rxdata_octets;
2091 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2092 stats->dataout_pdus = conn->dataout_pdus_cnt;
2093 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2094 stats->datain_pdus = conn->datain_pdus_cnt;
2095 stats->r2t_pdus = conn->r2t_pdus_cnt;
2096 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2097 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2098 stats->digest_err = 0;
2099 stats->timeout_err = 0;
2100 stats->custom_length = 1;
2101 strcpy(stats->custom[0].desc, "eh_abort_cnt");
2102 stats->custom[0].value = conn->eh_abort_cnt;
2103}
2104EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2105
2106static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2107{
2108 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2109 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2110 struct cxgbi_device *cdev = cconn->chba->cdev;
2111 unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2112 unsigned int max_def = 512 * MAX_SKB_FRAGS;
2113 unsigned int max = max(max_def, headroom);
2114
2115 max = min(cconn->chba->cdev->tx_max_size, max);
2116 if (conn->max_xmit_dlength)
2117 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2118 else
2119 conn->max_xmit_dlength = max;
2120 cxgbi_align_pdu_size(conn->max_xmit_dlength);
2121
2122 return 0;
2123}
2124
2125static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2126{
2127 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2128 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2129 unsigned int max = cconn->chba->cdev->rx_max_size;
2130
2131 cxgbi_align_pdu_size(max);
2132
2133 if (conn->max_recv_dlength) {
2134 if (conn->max_recv_dlength > max) {
2135 pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2136 conn->max_recv_dlength, max);
2137 return -EINVAL;
2138 }
2139 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2140 cxgbi_align_pdu_size(conn->max_recv_dlength);
2141 } else
2142 conn->max_recv_dlength = max;
2143
2144 return 0;
2145}
2146
2147int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2148 enum iscsi_param param, char *buf, int buflen)
2149{
2150 struct iscsi_conn *conn = cls_conn->dd_data;
2151 struct iscsi_session *session = conn->session;
2152 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2153 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2154 struct cxgbi_sock *csk = cconn->cep->csk;
2155 int value, err = 0;
2156
2157 log_debug(1 << CXGBI_DBG_ISCSI,
2158 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2159 cls_conn, param, buflen, buf);
2160
2161 switch (param) {
2162 case ISCSI_PARAM_HDRDGST_EN:
2163 err = iscsi_set_param(cls_conn, param, buf, buflen);
2164 if (!err && conn->hdrdgst_en)
2165 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2166 conn->hdrdgst_en,
2167 conn->datadgst_en, 0);
2168 break;
2169 case ISCSI_PARAM_DATADGST_EN:
2170 err = iscsi_set_param(cls_conn, param, buf, buflen);
2171 if (!err && conn->datadgst_en)
2172 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2173 conn->hdrdgst_en,
2174 conn->datadgst_en, 0);
2175 break;
2176 case ISCSI_PARAM_MAX_R2T:
2177 sscanf(buf, "%d", &value);
2178 if (value <= 0 || !is_power_of_2(value))
2179 return -EINVAL;
2180 if (session->max_r2t == value)
2181 break;
2182 iscsi_tcp_r2tpool_free(session);
2183 err = iscsi_set_param(cls_conn, param, buf, buflen);
2184 if (!err && iscsi_tcp_r2tpool_alloc(session))
2185 return -ENOMEM;
2186 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2187 err = iscsi_set_param(cls_conn, param, buf, buflen);
2188 if (!err)
2189 err = cxgbi_conn_max_recv_dlength(conn);
2190 break;
2191 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2192 err = iscsi_set_param(cls_conn, param, buf, buflen);
2193 if (!err)
2194 err = cxgbi_conn_max_xmit_dlength(conn);
2195 break;
2196 default:
2197 return iscsi_set_param(cls_conn, param, buf, buflen);
2198 }
2199 return err;
2200}
2201EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2202
2203int cxgbi_get_conn_param(struct iscsi_cls_conn *cls_conn,
2204 enum iscsi_param param, char *buf)
2205{
2206 struct iscsi_conn *iconn = cls_conn->dd_data;
2207 int len;
2208
2209 log_debug(1 << CXGBI_DBG_ISCSI,
2210 "cls_conn 0x%p, param %d.\n", cls_conn, param);
2211
2212 switch (param) {
2213 case ISCSI_PARAM_CONN_PORT:
2214 spin_lock_bh(&iconn->session->lock);
2215 len = sprintf(buf, "%hu\n", iconn->portal_port);
2216 spin_unlock_bh(&iconn->session->lock);
2217 break;
2218 case ISCSI_PARAM_CONN_ADDRESS:
2219 spin_lock_bh(&iconn->session->lock);
2220 len = sprintf(buf, "%s\n", iconn->portal_address);
2221 spin_unlock_bh(&iconn->session->lock);
2222 break;
2223 default:
2224 return iscsi_conn_get_param(cls_conn, param, buf);
2225 }
2226 return len;
2227}
2228EXPORT_SYMBOL_GPL(cxgbi_get_conn_param);
2229
2230struct iscsi_cls_conn *
2231cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2232{
2233 struct iscsi_cls_conn *cls_conn;
2234 struct iscsi_conn *conn;
2235 struct iscsi_tcp_conn *tcp_conn;
2236 struct cxgbi_conn *cconn;
2237
2238 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2239 if (!cls_conn)
2240 return NULL;
2241
2242 conn = cls_conn->dd_data;
2243 tcp_conn = conn->dd_data;
2244 cconn = tcp_conn->dd_data;
2245 cconn->iconn = conn;
2246
2247 log_debug(1 << CXGBI_DBG_ISCSI,
2248 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2249 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2250
2251 return cls_conn;
2252}
2253EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2254
2255int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2256 struct iscsi_cls_conn *cls_conn,
2257 u64 transport_eph, int is_leading)
2258{
2259 struct iscsi_conn *conn = cls_conn->dd_data;
2260 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2261 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2262 struct iscsi_endpoint *ep;
2263 struct cxgbi_endpoint *cep;
2264 struct cxgbi_sock *csk;
2265 int err;
2266
2267 ep = iscsi_lookup_endpoint(transport_eph);
2268 if (!ep)
2269 return -EINVAL;
2270
2271 /* setup ddp pagesize */
2272 cep = ep->dd_data;
2273 csk = cep->csk;
2274 err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid, page_idx, 0);
2275 if (err < 0)
2276 return err;
2277
2278 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2279 if (err)
2280 return -EINVAL;
2281
2282 /* calculate the tag idx bits needed for this conn based on cmds_max */
2283 cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2284
e3d2ad8c 2285 write_lock_bh(&csk->callback_lock);
9ba682f0 2286 csk->user_data = conn;
2287 cconn->chba = cep->chba;
2288 cconn->cep = cep;
2289 cep->cconn = cconn;
e3d2ad8c 2290 write_unlock_bh(&csk->callback_lock);
9ba682f0 2291
2292 cxgbi_conn_max_xmit_dlength(conn);
2293 cxgbi_conn_max_recv_dlength(conn);
2294
2295 spin_lock_bh(&conn->session->lock);
2296 sprintf(conn->portal_address, "%pI4", &csk->daddr.sin_addr.s_addr);
2297 conn->portal_port = ntohs(csk->daddr.sin_port);
2298 spin_unlock_bh(&conn->session->lock);
2299
2300 log_debug(1 << CXGBI_DBG_ISCSI,
2301 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2302 cls_session, cls_conn, ep, cconn, csk);
2303 /* init recv engine */
2304 iscsi_tcp_hdr_recv_prep(tcp_conn);
2305
2306 return 0;
2307}
2308EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2309
2310struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2311 u16 cmds_max, u16 qdepth,
2312 u32 initial_cmdsn)
2313{
2314 struct cxgbi_endpoint *cep;
2315 struct cxgbi_hba *chba;
2316 struct Scsi_Host *shost;
2317 struct iscsi_cls_session *cls_session;
2318 struct iscsi_session *session;
2319
2320 if (!ep) {
2321 pr_err("missing endpoint.\n");
2322 return NULL;
2323 }
2324
2325 cep = ep->dd_data;
2326 chba = cep->chba;
2327 shost = chba->shost;
2328
2329 BUG_ON(chba != iscsi_host_priv(shost));
2330
2331 cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2332 cmds_max, 0,
2333 sizeof(struct iscsi_tcp_task) +
2334 sizeof(struct cxgbi_task_data),
2335 initial_cmdsn, ISCSI_MAX_TARGET);
2336 if (!cls_session)
2337 return NULL;
2338
2339 session = cls_session->dd_data;
2340 if (iscsi_tcp_r2tpool_alloc(session))
2341 goto remove_session;
2342
2343 log_debug(1 << CXGBI_DBG_ISCSI,
2344 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2345 return cls_session;
2346
2347remove_session:
2348 iscsi_session_teardown(cls_session);
2349 return NULL;
2350}
2351EXPORT_SYMBOL_GPL(cxgbi_create_session);
2352
2353void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2354{
2355 log_debug(1 << CXGBI_DBG_ISCSI,
2356 "cls sess 0x%p.\n", cls_session);
2357
2358 iscsi_tcp_r2tpool_free(cls_session->dd_data);
2359 iscsi_session_teardown(cls_session);
2360}
2361EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2362
2363int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2364 char *buf, int buflen)
2365{
2366 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2367
2368 if (!chba->ndev) {
2369 shost_printk(KERN_ERR, shost, "Could not get host param. "
2370 "netdev for host not set.\n");
2371 return -ENODEV;
2372 }
2373
2374 log_debug(1 << CXGBI_DBG_ISCSI,
2375 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2376 shost, chba, chba->ndev->name, param, buflen, buf);
2377
2378 switch (param) {
2379 case ISCSI_HOST_PARAM_IPADDRESS:
2380 {
2381 __be32 addr = in_aton(buf);
2382 log_debug(1 << CXGBI_DBG_ISCSI,
2383 "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2384 cxgbi_set_iscsi_ipv4(chba, addr);
2385 return 0;
2386 }
2387 case ISCSI_HOST_PARAM_HWADDRESS:
2388 case ISCSI_HOST_PARAM_NETDEV_NAME:
2389 return 0;
2390 default:
2391 return iscsi_host_set_param(shost, param, buf, buflen);
2392 }
2393}
2394EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2395
2396int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2397 char *buf)
2398{
2399 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2400 int len = 0;
2401
2402 if (!chba->ndev) {
2403 shost_printk(KERN_ERR, shost, "Could not get host param. "
2404 "netdev for host not set.\n");
2405 return -ENODEV;
2406 }
2407
2408 log_debug(1 << CXGBI_DBG_ISCSI,
2409 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2410 shost, chba, chba->ndev->name, param);
2411
2412 switch (param) {
2413 case ISCSI_HOST_PARAM_HWADDRESS:
2414 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2415 break;
2416 case ISCSI_HOST_PARAM_NETDEV_NAME:
2417 len = sprintf(buf, "%s\n", chba->ndev->name);
2418 break;
2419 case ISCSI_HOST_PARAM_IPADDRESS:
2420 {
2421 __be32 addr;
2422
2423 addr = cxgbi_get_iscsi_ipv4(chba);
2424 len = sprintf(buf, "%pI4", &addr);
2425 log_debug(1 << CXGBI_DBG_ISCSI,
2426 "hba %s, ipv4 %pI4.\n", chba->ndev->name, &addr);
2427 break;
2428 }
2429 default:
2430 return iscsi_host_get_param(shost, param, buf);
2431 }
2432
2433 return len;
2434}
2435EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2436
2437struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2438 struct sockaddr *dst_addr,
2439 int non_blocking)
2440{
2441 struct iscsi_endpoint *ep;
2442 struct cxgbi_endpoint *cep;
2443 struct cxgbi_hba *hba = NULL;
2444 struct cxgbi_sock *csk;
2445 int err = -EINVAL;
2446
2447 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2448 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2449 shost, non_blocking, dst_addr);
2450
2451 if (shost) {
2452 hba = iscsi_host_priv(shost);
2453 if (!hba) {
2454 pr_info("shost 0x%p, priv NULL.\n", shost);
2455 goto err_out;
2456 }
2457 }
2458
2459 csk = cxgbi_check_route(dst_addr);
2460 if (IS_ERR(csk))
2461 return (struct iscsi_endpoint *)csk;
2462 cxgbi_sock_get(csk);
2463
2464 if (!hba)
2465 hba = csk->cdev->hbas[csk->port_id];
2466 else if (hba != csk->cdev->hbas[csk->port_id]) {
2467 pr_info("Could not connect through requested host %u"
2468 "hba 0x%p != 0x%p (%u).\n",
2469 shost->host_no, hba,
2470 csk->cdev->hbas[csk->port_id], csk->port_id);
2471 err = -ENOSPC;
2472 goto release_conn;
2473 }
2474
2475 err = sock_get_port(csk);
2476 if (err)
2477 goto release_conn;
2478
2479 cxgbi_sock_set_state(csk, CTP_CONNECTING);
2480 err = csk->cdev->csk_init_act_open(csk);
2481 if (err)
2482 goto release_conn;
2483
2484 if (cxgbi_sock_is_closing(csk)) {
2485 err = -ENOSPC;
2486 pr_info("csk 0x%p is closing.\n", csk);
2487 goto release_conn;
2488 }
2489
2490 ep = iscsi_create_endpoint(sizeof(*cep));
2491 if (!ep) {
2492 err = -ENOMEM;
2493 pr_info("iscsi alloc ep, OOM.\n");
2494 goto release_conn;
2495 }
2496
2497 cep = ep->dd_data;
2498 cep->csk = csk;
2499 cep->chba = hba;
2500
2501 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2502 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2503 ep, cep, csk, hba, hba->ndev->name);
2504 return ep;
2505
2506release_conn:
2507 cxgbi_sock_put(csk);
2508 cxgbi_sock_closed(csk);
2509err_out:
2510 return ERR_PTR(err);
2511}
2512EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2513
2514int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2515{
2516 struct cxgbi_endpoint *cep = ep->dd_data;
2517 struct cxgbi_sock *csk = cep->csk;
2518
2519 if (!cxgbi_sock_is_established(csk))
2520 return 0;
2521 return 1;
2522}
2523EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2524
2525void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2526{
2527 struct cxgbi_endpoint *cep = ep->dd_data;
2528 struct cxgbi_conn *cconn = cep->cconn;
2529 struct cxgbi_sock *csk = cep->csk;
2530
2531 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2532 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2533 ep, cep, cconn, csk, csk->state, csk->flags);
2534
2535 if (cconn && cconn->iconn) {
2536 iscsi_suspend_tx(cconn->iconn);
2537 write_lock_bh(&csk->callback_lock);
2538 cep->csk->user_data = NULL;
2539 cconn->cep = NULL;
2540 write_unlock_bh(&csk->callback_lock);
2541 }
2542 iscsi_destroy_endpoint(ep);
2543
2544 if (likely(csk->state >= CTP_ESTABLISHED))
2545 need_active_close(csk);
2546 else
2547 cxgbi_sock_closed(csk);
2548
2549 cxgbi_sock_put(csk);
2550}
2551EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2552
2553int cxgbi_iscsi_init(struct iscsi_transport *itp,
2554 struct scsi_transport_template **stt)
2555{
2556 *stt = iscsi_register_transport(itp);
2557 if (*stt == NULL) {
2558 pr_err("unable to register %s transport 0x%p.\n",
2559 itp->name, itp);
2560 return -ENODEV;
2561 }
2562 log_debug(1 << CXGBI_DBG_ISCSI,
2563 "%s, registered iscsi transport 0x%p.\n",
2564 itp->name, stt);
2565 return 0;
2566}
2567EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2568
2569void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2570 struct scsi_transport_template **stt)
2571{
2572 if (*stt) {
2573 log_debug(1 << CXGBI_DBG_ISCSI,
2574 "de-register transport 0x%p, %s, stt 0x%p.\n",
2575 itp, itp->name, *stt);
2576 *stt = NULL;
2577 iscsi_unregister_transport(itp);
2578 }
2579}
2580EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2581
2582static int __init libcxgbi_init_module(void)
2583{
2584 sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
2585 sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
2586
2587 pr_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
2588 ISCSI_ITT_MASK, sw_tag_idx_bits,
2589 ISCSI_AGE_MASK, sw_tag_age_bits);
2590
2591 ddp_setup_host_page_size();
2592 return 0;
2593}
2594
2595static void __exit libcxgbi_exit_module(void)
2596{
2597 cxgbi_device_unregister_all(0xFF);
2598 return;
2599}
2600
2601module_init(libcxgbi_init_module);
2602module_exit(libcxgbi_exit_module);
kernel source for telekom puls (alcatel/mediatek)