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[deliverable/linux.git] / drivers / scsi / cxgbi / libcxgbi.c
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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
273447b3 473 if (ip_route_output_flow(&init_net, &rt, &fl, NULL))
9ba682f0 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
1280 if (cdev->csk_ddp_alloc_gl_skb) {
1281 err = cdev->csk_ddp_alloc_gl_skb(ddp, idx, npods, gfp);
1282 if (err < 0)
1283 goto unmark_entries;
1284 }
1285
1286 tag = cxgbi_ddp_tag_base(tformat, sw_tag);
1287 tag |= idx << PPOD_IDX_SHIFT;
1288
1289 hdr.rsvd = 0;
1290 hdr.vld_tid = htonl(PPOD_VALID_FLAG | PPOD_TID(tid));
1291 hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask);
1292 hdr.max_offset = htonl(gl->length);
1293 hdr.page_offset = htonl(gl->offset);
1294
1295 err = cdev->csk_ddp_set(csk, &hdr, idx, npods, gl);
1296 if (err < 0) {
1297 if (cdev->csk_ddp_free_gl_skb)
1298 cdev->csk_ddp_free_gl_skb(ddp, idx, npods);
1299 goto unmark_entries;
1300 }
1301
1302 ddp->idx_last = idx;
1303 log_debug(1 << CXGBI_DBG_DDP,
1304 "xfer %u, gl %u,%u, tid 0x%x, tag 0x%x->0x%x(%u,%u).\n",
1305 gl->length, gl->nelem, gl->offset, tid, sw_tag, tag, idx,
1306 npods);
1307 *tagp = tag;
1308 return 0;
1309
1310unmark_entries:
1311 ddp_unmark_entries(ddp, idx, npods);
1312 return err;
1313}
1314
1315int cxgbi_ddp_reserve(struct cxgbi_sock *csk, unsigned int *tagp,
1316 unsigned int sw_tag, unsigned int xferlen,
1317 struct scatterlist *sgl, unsigned int sgcnt, gfp_t gfp)
1318{
1319 struct cxgbi_device *cdev = csk->cdev;
1320 struct cxgbi_tag_format *tformat = &cdev->tag_format;
1321 struct cxgbi_gather_list *gl;
1322 int err;
1323
1324 if (page_idx >= DDP_PGIDX_MAX || !cdev->ddp ||
1325 xferlen < DDP_THRESHOLD) {
1326 log_debug(1 << CXGBI_DBG_DDP,
1327 "pgidx %u, xfer %u, NO ddp.\n", page_idx, xferlen);
1328 return -EINVAL;
1329 }
1330
1331 if (!cxgbi_sw_tag_usable(tformat, sw_tag)) {
1332 log_debug(1 << CXGBI_DBG_DDP,
1333 "sw_tag 0x%x NOT usable.\n", sw_tag);
1334 return -EINVAL;
1335 }
1336
1337 gl = ddp_make_gl(xferlen, sgl, sgcnt, cdev->pdev, gfp);
1338 if (!gl)
1339 return -ENOMEM;
1340
1341 err = ddp_tag_reserve(csk, csk->tid, sw_tag, tagp, gl, gfp);
1342 if (err < 0)
1343 ddp_release_gl(gl, cdev->pdev);
1344
1345 return err;
1346}
1347
1348static void ddp_destroy(struct kref *kref)
1349{
1350 struct cxgbi_ddp_info *ddp = container_of(kref,
1351 struct cxgbi_ddp_info,
1352 refcnt);
1353 struct cxgbi_device *cdev = ddp->cdev;
1354 int i = 0;
1355
1356 pr_info("kref 0, destroy ddp 0x%p, cdev 0x%p.\n", ddp, cdev);
1357
1358 while (i < ddp->nppods) {
1359 struct cxgbi_gather_list *gl = ddp->gl_map[i];
1360
1361 if (gl) {
1362 int npods = (gl->nelem + PPOD_PAGES_MAX - 1)
1363 >> PPOD_PAGES_SHIFT;
1364 pr_info("cdev 0x%p, ddp %d + %d.\n", cdev, i, npods);
1365 kfree(gl);
1366 if (cdev->csk_ddp_free_gl_skb)
1367 cdev->csk_ddp_free_gl_skb(ddp, i, npods);
1368 i += npods;
1369 } else
1370 i++;
1371 }
1372 cxgbi_free_big_mem(ddp);
1373}
1374
1375int cxgbi_ddp_cleanup(struct cxgbi_device *cdev)
1376{
1377 struct cxgbi_ddp_info *ddp = cdev->ddp;
1378
1379 log_debug(1 << CXGBI_DBG_DDP,
1380 "cdev 0x%p, release ddp 0x%p.\n", cdev, ddp);
1381 cdev->ddp = NULL;
1382 if (ddp)
1383 return kref_put(&ddp->refcnt, ddp_destroy);
1384 return 0;
1385}
1386EXPORT_SYMBOL_GPL(cxgbi_ddp_cleanup);
1387
1388int cxgbi_ddp_init(struct cxgbi_device *cdev,
1389 unsigned int llimit, unsigned int ulimit,
1390 unsigned int max_txsz, unsigned int max_rxsz)
1391{
1392 struct cxgbi_ddp_info *ddp;
1393 unsigned int ppmax, bits;
1394
1395 ppmax = (ulimit - llimit + 1) >> PPOD_SIZE_SHIFT;
1396 bits = __ilog2_u32(ppmax) + 1;
1397 if (bits > PPOD_IDX_MAX_SIZE)
1398 bits = PPOD_IDX_MAX_SIZE;
1399 ppmax = (1 << (bits - 1)) - 1;
1400
1401 ddp = cxgbi_alloc_big_mem(sizeof(struct cxgbi_ddp_info) +
1402 ppmax * (sizeof(struct cxgbi_gather_list *) +
1403 sizeof(struct sk_buff *)),
1404 GFP_KERNEL);
1405 if (!ddp) {
1406 pr_warn("cdev 0x%p, ddp ppmax %u OOM.\n", cdev, ppmax);
1407 return -ENOMEM;
1408 }
1409 ddp->gl_map = (struct cxgbi_gather_list **)(ddp + 1);
1410 ddp->gl_skb = (struct sk_buff **)(((char *)ddp->gl_map) +
1411 ppmax * sizeof(struct cxgbi_gather_list *));
1412 cdev->ddp = ddp;
1413
1414 spin_lock_init(&ddp->map_lock);
1415 kref_init(&ddp->refcnt);
1416
1417 ddp->cdev = cdev;
1418 ddp->pdev = cdev->pdev;
1419 ddp->llimit = llimit;
1420 ddp->ulimit = ulimit;
1421 ddp->max_txsz = min_t(unsigned int, max_txsz, ULP2_MAX_PKT_SIZE);
1422 ddp->max_rxsz = min_t(unsigned int, max_rxsz, ULP2_MAX_PKT_SIZE);
1423 ddp->nppods = ppmax;
1424 ddp->idx_last = ppmax;
1425 ddp->idx_bits = bits;
1426 ddp->idx_mask = (1 << bits) - 1;
1427 ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1;
1428
1429 cdev->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
1430 cdev->tag_format.rsvd_bits = ddp->idx_bits;
1431 cdev->tag_format.rsvd_shift = PPOD_IDX_SHIFT;
1432 cdev->tag_format.rsvd_mask = (1 << cdev->tag_format.rsvd_bits) - 1;
1433
1434 pr_info("%s tag format, sw %u, rsvd %u,%u, mask 0x%x.\n",
1435 cdev->ports[0]->name, cdev->tag_format.sw_bits,
1436 cdev->tag_format.rsvd_bits, cdev->tag_format.rsvd_shift,
1437 cdev->tag_format.rsvd_mask);
1438
1439 cdev->tx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1440 ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
1441 cdev->rx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1442 ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);
1443
1444 log_debug(1 << CXGBI_DBG_DDP,
1445 "%s max payload size: %u/%u, %u/%u.\n",
1446 cdev->ports[0]->name, cdev->tx_max_size, ddp->max_txsz,
1447 cdev->rx_max_size, ddp->max_rxsz);
1448 return 0;
1449}
1450EXPORT_SYMBOL_GPL(cxgbi_ddp_init);
1451
1452/*
1453 * APIs interacting with open-iscsi libraries
1454 */
1455
1456static unsigned char padding[4];
1457
1458static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1459{
1460 struct scsi_cmnd *sc = task->sc;
1461 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1462 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1463 struct cxgbi_hba *chba = cconn->chba;
1464 struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1465 u32 tag = ntohl((__force u32)hdr_itt);
1466
1467 log_debug(1 << CXGBI_DBG_DDP,
1468 "cdev 0x%p, release tag 0x%x.\n", chba->cdev, tag);
1469 if (sc &&
1470 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
1471 cxgbi_is_ddp_tag(tformat, tag))
1472 ddp_tag_release(chba, tag);
1473}
1474
1475static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1476{
1477 struct scsi_cmnd *sc = task->sc;
1478 struct iscsi_conn *conn = task->conn;
1479 struct iscsi_session *sess = conn->session;
1480 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1481 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1482 struct cxgbi_hba *chba = cconn->chba;
1483 struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1484 u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
1485 u32 tag = 0;
1486 int err = -EINVAL;
1487
1488 if (sc &&
1489 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)) {
1490 err = cxgbi_ddp_reserve(cconn->cep->csk, &tag, sw_tag,
1491 scsi_in(sc)->length,
1492 scsi_in(sc)->table.sgl,
1493 scsi_in(sc)->table.nents,
1494 GFP_ATOMIC);
1495 if (err < 0)
1496 log_debug(1 << CXGBI_DBG_DDP,
1497 "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1498 cconn->cep->csk, task, scsi_in(sc)->length,
1499 scsi_in(sc)->table.nents);
1500 }
1501
1502 if (err < 0)
1503 tag = cxgbi_set_non_ddp_tag(tformat, sw_tag);
1504 /* the itt need to sent in big-endian order */
1505 *hdr_itt = (__force itt_t)htonl(tag);
1506
1507 log_debug(1 << CXGBI_DBG_DDP,
1508 "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1509 chba->cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1510 return 0;
1511}
1512
1513void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1514{
1515 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1516 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1517 struct cxgbi_device *cdev = cconn->chba->cdev;
1518 u32 tag = ntohl((__force u32) itt);
1519 u32 sw_bits;
1520
1521 sw_bits = cxgbi_tag_nonrsvd_bits(&cdev->tag_format, tag);
1522 if (idx)
1523 *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
1524 if (age)
1525 *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
1526
1527 log_debug(1 << CXGBI_DBG_DDP,
1528 "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1529 cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1530 age ? *age : 0xFF);
1531}
1532EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1533
1534void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1535{
1536 struct iscsi_conn *conn = csk->user_data;
1537
1538 if (conn) {
1539 log_debug(1 << CXGBI_DBG_SOCK,
1540 "csk 0x%p, cid %d.\n", csk, conn->id);
1541 iscsi_conn_queue_work(conn);
1542 }
1543}
1544EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1545
1546/*
1547 * pdu receive, interact with libiscsi_tcp
1548 */
1549static inline int read_pdu_skb(struct iscsi_conn *conn,
1550 struct sk_buff *skb,
1551 unsigned int offset,
1552 int offloaded)
1553{
1554 int status = 0;
1555 int bytes_read;
1556
1557 bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1558 switch (status) {
1559 case ISCSI_TCP_CONN_ERR:
1560 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1561 skb, offset, offloaded);
1562 return -EIO;
1563 case ISCSI_TCP_SUSPENDED:
1564 log_debug(1 << CXGBI_DBG_PDU_RX,
1565 "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1566 skb, offset, offloaded, bytes_read);
1567 /* no transfer - just have caller flush queue */
1568 return bytes_read;
1569 case ISCSI_TCP_SKB_DONE:
1570 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1571 skb, offset, offloaded);
1572 /*
1573 * pdus should always fit in the skb and we should get
1574 * segment done notifcation.
1575 */
1576 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1577 return -EFAULT;
1578 case ISCSI_TCP_SEGMENT_DONE:
1579 log_debug(1 << CXGBI_DBG_PDU_RX,
1580 "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1581 skb, offset, offloaded, bytes_read);
1582 return bytes_read;
1583 default:
1584 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1585 skb, offset, offloaded, status);
1586 return -EINVAL;
1587 }
1588}
1589
1590static int skb_read_pdu_bhs(struct iscsi_conn *conn, struct sk_buff *skb)
1591{
1592 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1593
1594 log_debug(1 << CXGBI_DBG_PDU_RX,
1595 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1596 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1597
1598 if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1599 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1600 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1601 return -EIO;
1602 }
1603
1604 if (conn->hdrdgst_en &&
1605 cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1606 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1607 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1608 return -EIO;
1609 }
1610
1611 return read_pdu_skb(conn, skb, 0, 0);
1612}
1613
1614static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1615 struct sk_buff *skb, unsigned int offset)
1616{
1617 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1618 bool offloaded = 0;
1619 int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1620
1621 log_debug(1 << CXGBI_DBG_PDU_RX,
1622 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1623 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1624
1625 if (conn->datadgst_en &&
1626 cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1627 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1628 conn, lskb, cxgbi_skcb_flags(lskb));
1629 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1630 return -EIO;
1631 }
1632
1633 if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1634 return 0;
1635
1636 /* coalesced, add header digest length */
1637 if (lskb == skb && conn->hdrdgst_en)
1638 offset += ISCSI_DIGEST_SIZE;
1639
1640 if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1641 offloaded = 1;
1642
1643 if (opcode == ISCSI_OP_SCSI_DATA_IN)
1644 log_debug(1 << CXGBI_DBG_PDU_RX,
1645 "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1646 skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1647 tcp_conn->in.datalen, offloaded ? "is" : "not");
1648
1649 return read_pdu_skb(conn, skb, offset, offloaded);
1650}
1651
1652static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1653{
1654 struct cxgbi_device *cdev = csk->cdev;
1655 int must_send;
1656 u32 credits;
1657
1658 log_debug(1 << CXGBI_DBG_PDU_RX,
1659 "csk 0x%p,%u,0x%lu,%u, seq %u, wup %u, thre %u, %u.\n",
1660 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1661 csk->rcv_wup, cdev->rx_credit_thres,
1662 cdev->rcv_win);
1663
1664 if (csk->state != CTP_ESTABLISHED)
1665 return;
1666
1667 credits = csk->copied_seq - csk->rcv_wup;
1668 if (unlikely(!credits))
1669 return;
1670 if (unlikely(cdev->rx_credit_thres == 0))
1671 return;
1672
1673 must_send = credits + 16384 >= cdev->rcv_win;
1674 if (must_send || credits >= cdev->rx_credit_thres)
1675 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1676}
1677
1678void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1679{
1680 struct cxgbi_device *cdev = csk->cdev;
1681 struct iscsi_conn *conn = csk->user_data;
1682 struct sk_buff *skb;
1683 unsigned int read = 0;
1684 int err = 0;
1685
1686 log_debug(1 << CXGBI_DBG_PDU_RX,
1687 "csk 0x%p, conn 0x%p.\n", csk, conn);
1688
1689 if (unlikely(!conn || conn->suspend_rx)) {
1690 log_debug(1 << CXGBI_DBG_PDU_RX,
1691 "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1692 csk, conn, conn ? conn->id : 0xFF,
1693 conn ? conn->suspend_rx : 0xFF);
9ba682f0 1694 return;
1695 }
1696
1697 while (!err) {
9ba682f0 1698 skb = skb_peek(&csk->receive_queue);
1699 if (!skb ||
1700 !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1701 if (skb)
1702 log_debug(1 << CXGBI_DBG_PDU_RX,
1703 "skb 0x%p, NOT ready 0x%lx.\n",
1704 skb, cxgbi_skcb_flags(skb));
9ba682f0 1705 break;
1706 }
1707 __skb_unlink(skb, &csk->receive_queue);
9ba682f0 1708
1709 read += cxgbi_skcb_rx_pdulen(skb);
1710 log_debug(1 << CXGBI_DBG_PDU_RX,
1711 "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1712 csk, skb, skb->len, cxgbi_skcb_flags(skb),
1713 cxgbi_skcb_rx_pdulen(skb));
1714
1715 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1716 err = skb_read_pdu_bhs(conn, skb);
e3d2ad8c 1717 if (err < 0) {
1718 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1719 "f 0x%lx, plen %u.\n",
1720 csk, skb, skb->len,
1721 cxgbi_skcb_flags(skb),
1722 cxgbi_skcb_rx_pdulen(skb));
1723 goto skb_done;
1724 }
9ba682f0 1725 err = skb_read_pdu_data(conn, skb, skb,
1726 err + cdev->skb_rx_extra);
e3d2ad8c 1727 if (err < 0)
1728 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1729 "f 0x%lx, plen %u.\n",
1730 csk, skb, skb->len,
1731 cxgbi_skcb_flags(skb),
1732 cxgbi_skcb_rx_pdulen(skb));
9ba682f0 1733 } else {
1734 err = skb_read_pdu_bhs(conn, skb);
e3d2ad8c 1735 if (err < 0) {
1736 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1737 "f 0x%lx, plen %u.\n",
1738 csk, skb, skb->len,
1739 cxgbi_skcb_flags(skb),
1740 cxgbi_skcb_rx_pdulen(skb));
1741 goto skb_done;
1742 }
1743
9ba682f0 1744 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1745 struct sk_buff *dskb;
1746
9ba682f0 1747 dskb = skb_peek(&csk->receive_queue);
1748 if (!dskb) {
e3d2ad8c 1749 pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1750 " plen %u, NO data.\n",
1751 csk, skb, skb->len,
1752 cxgbi_skcb_flags(skb),
1753 cxgbi_skcb_rx_pdulen(skb));
1754 err = -EIO;
1755 goto skb_done;
9ba682f0 1756 }
1757 __skb_unlink(dskb, &csk->receive_queue);
9ba682f0 1758
1759 err = skb_read_pdu_data(conn, skb, dskb, 0);
e3d2ad8c 1760 if (err < 0)
1761 pr_err("data, csk 0x%p, skb 0x%p,%u, "
1762 "f 0x%lx, plen %u, dskb 0x%p,"
1763 "%u.\n",
1764 csk, skb, skb->len,
1765 cxgbi_skcb_flags(skb),
1766 cxgbi_skcb_rx_pdulen(skb),
1767 dskb, dskb->len);
9ba682f0 1768 __kfree_skb(dskb);
1769 } else
1770 err = skb_read_pdu_data(conn, skb, skb, 0);
1771 }
e3d2ad8c 1772skb_done:
1773 __kfree_skb(skb);
1774
9ba682f0 1775 if (err < 0)
1776 break;
9ba682f0 1777 }
1778
1779 log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
1780 if (read) {
1781 csk->copied_seq += read;
1782 csk_return_rx_credits(csk, read);
1783 conn->rxdata_octets += read;
1784 }
1785
1786 if (err < 0) {
e3d2ad8c 1787 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
1788 csk, conn, err, read);
9ba682f0 1789 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1790 }
1791}
1792EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
1793
1794static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
1795 unsigned int offset, unsigned int *off,
1796 struct scatterlist **sgp)
1797{
1798 int i;
1799 struct scatterlist *sg;
1800
1801 for_each_sg(sgl, sg, sgcnt, i) {
1802 if (offset < sg->length) {
1803 *off = offset;
1804 *sgp = sg;
1805 return 0;
1806 }
1807 offset -= sg->length;
1808 }
1809 return -EFAULT;
1810}
1811
1812static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
1813 unsigned int dlen, skb_frag_t *frags,
1814 int frag_max)
1815{
1816 unsigned int datalen = dlen;
1817 unsigned int sglen = sg->length - sgoffset;
1818 struct page *page = sg_page(sg);
1819 int i;
1820
1821 i = 0;
1822 do {
1823 unsigned int copy;
1824
1825 if (!sglen) {
1826 sg = sg_next(sg);
1827 if (!sg) {
1828 pr_warn("sg %d NULL, len %u/%u.\n",
1829 i, datalen, dlen);
1830 return -EINVAL;
1831 }
1832 sgoffset = 0;
1833 sglen = sg->length;
1834 page = sg_page(sg);
1835
1836 }
1837 copy = min(datalen, sglen);
1838 if (i && page == frags[i - 1].page &&
1839 sgoffset + sg->offset ==
1840 frags[i - 1].page_offset + frags[i - 1].size) {
1841 frags[i - 1].size += copy;
1842 } else {
1843 if (i >= frag_max) {
1844 pr_warn("too many pages %u, dlen %u.\n",
1845 frag_max, dlen);
1846 return -EINVAL;
1847 }
1848
1849 frags[i].page = page;
1850 frags[i].page_offset = sg->offset + sgoffset;
1851 frags[i].size = copy;
1852 i++;
1853 }
1854 datalen -= copy;
1855 sgoffset += copy;
1856 sglen -= copy;
1857 } while (datalen);
1858
1859 return i;
1860}
1861
1862int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
1863{
1864 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1865 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1866 struct cxgbi_device *cdev = cconn->chba->cdev;
1867 struct iscsi_conn *conn = task->conn;
1868 struct iscsi_tcp_task *tcp_task = task->dd_data;
e3d2ad8c 1869 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
9ba682f0 1870 struct scsi_cmnd *sc = task->sc;
1871 int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
1872
1873 tcp_task->dd_data = tdata;
1874 task->hdr = NULL;
1875
1876 if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
1877 (opcode == ISCSI_OP_SCSI_DATA_OUT ||
1878 (opcode == ISCSI_OP_SCSI_CMD &&
1879 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
1880 /* data could goes into skb head */
1881 headroom += min_t(unsigned int,
1882 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
1883 conn->max_xmit_dlength);
1884
1885 tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
1886 if (!tdata->skb) {
1887 pr_warn("alloc skb %u+%u, opcode 0x%x failed.\n",
1888 cdev->skb_tx_rsvd, headroom, opcode);
1889 return -ENOMEM;
1890 }
1891
1892 skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
1893 task->hdr = (struct iscsi_hdr *)tdata->skb->data;
1894 task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
1895
1896 /* data_out uses scsi_cmd's itt */
1897 if (opcode != ISCSI_OP_SCSI_DATA_OUT)
1898 task_reserve_itt(task, &task->hdr->itt);
1899
1900 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1901 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
1902 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
1903 conn->max_xmit_dlength, ntohl(task->hdr->itt));
1904
1905 return 0;
1906}
1907EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
1908
1909static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
1910{
1911 u8 submode = 0;
1912
1913 if (hcrc)
1914 submode |= 1;
1915 if (dcrc)
1916 submode |= 2;
1917 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
1918}
1919
1920int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
1921 unsigned int count)
1922{
1923 struct iscsi_conn *conn = task->conn;
e3d2ad8c 1924 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
9ba682f0 1925 struct sk_buff *skb = tdata->skb;
1926 unsigned int datalen = count;
1927 int i, padlen = iscsi_padding(count);
1928 struct page *pg;
1929
1930 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1931 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
1932 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
1933 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
1934
1935 skb_put(skb, task->hdr_len);
1936 tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
1937 if (!count)
1938 return 0;
1939
1940 if (task->sc) {
1941 struct scsi_data_buffer *sdb = scsi_out(task->sc);
1942 struct scatterlist *sg = NULL;
1943 int err;
1944
1945 tdata->offset = offset;
1946 tdata->count = count;
1947 err = sgl_seek_offset(
1948 sdb->table.sgl, sdb->table.nents,
1949 tdata->offset, &tdata->sgoffset, &sg);
1950 if (err < 0) {
1951 pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
1952 sdb->table.nents, tdata->offset, sdb->length);
1953 return err;
1954 }
1955 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
1956 tdata->frags, MAX_PDU_FRAGS);
1957 if (err < 0) {
1958 pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
1959 sdb->table.nents, tdata->offset, tdata->count);
1960 return err;
1961 }
1962 tdata->nr_frags = err;
1963
1964 if (tdata->nr_frags > MAX_SKB_FRAGS ||
1965 (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
1966 char *dst = skb->data + task->hdr_len;
1967 skb_frag_t *frag = tdata->frags;
1968
1969 /* data fits in the skb's headroom */
1970 for (i = 0; i < tdata->nr_frags; i++, frag++) {
1971 char *src = kmap_atomic(frag->page,
1972 KM_SOFTIRQ0);
1973
1974 memcpy(dst, src+frag->page_offset, frag->size);
1975 dst += frag->size;
1976 kunmap_atomic(src, KM_SOFTIRQ0);
1977 }
1978 if (padlen) {
1979 memset(dst, 0, padlen);
1980 padlen = 0;
1981 }
1982 skb_put(skb, count + padlen);
1983 } else {
1984 /* data fit into frag_list */
1985 for (i = 0; i < tdata->nr_frags; i++)
1986 get_page(tdata->frags[i].page);
1987
1988 memcpy(skb_shinfo(skb)->frags, tdata->frags,
1989 sizeof(skb_frag_t) * tdata->nr_frags);
1990 skb_shinfo(skb)->nr_frags = tdata->nr_frags;
1991 skb->len += count;
1992 skb->data_len += count;
1993 skb->truesize += count;
1994 }
1995
1996 } else {
1997 pg = virt_to_page(task->data);
1998
1999 get_page(pg);
2000 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
2001 count);
2002 skb->len += count;
2003 skb->data_len += count;
2004 skb->truesize += count;
2005 }
2006
2007 if (padlen) {
2008 i = skb_shinfo(skb)->nr_frags;
2009 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
2010 virt_to_page(padding), offset_in_page(padding),
2011 padlen);
2012
2013 skb->data_len += padlen;
2014 skb->truesize += padlen;
2015 skb->len += padlen;
2016 }
2017
2018 return 0;
2019}
2020EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
2021
2022int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2023{
2024 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2025 struct cxgbi_conn *cconn = tcp_conn->dd_data;
e3d2ad8c 2026 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
9ba682f0 2027 struct sk_buff *skb = tdata->skb;
2028 unsigned int datalen;
2029 int err;
2030
2031 if (!skb) {
2032 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2033 "task 0x%p, skb NULL.\n", task);
2034 return 0;
2035 }
2036
2037 datalen = skb->data_len;
2038 tdata->skb = NULL;
2039 err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2040 if (err > 0) {
2041 int pdulen = err;
2042
2043 log_debug(1 << CXGBI_DBG_PDU_TX,
2044 "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2045 task, task->sc, skb, skb->len, skb->data_len, err);
2046
2047 if (task->conn->hdrdgst_en)
2048 pdulen += ISCSI_DIGEST_SIZE;
2049
2050 if (datalen && task->conn->datadgst_en)
2051 pdulen += ISCSI_DIGEST_SIZE;
2052
2053 task->conn->txdata_octets += pdulen;
2054 return 0;
2055 }
2056
2057 if (err == -EAGAIN || err == -ENOBUFS) {
2058 log_debug(1 << CXGBI_DBG_PDU_TX,
2059 "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2060 task, skb, skb->len, skb->data_len, err);
2061 /* reset skb to send when we are called again */
2062 tdata->skb = skb;
2063 return err;
2064 }
2065
2066 kfree_skb(skb);
2067 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2068 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2069 task->itt, skb, skb->len, skb->data_len, err);
2070 iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2071 iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2072 return err;
2073}
2074EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2075
2076void cxgbi_cleanup_task(struct iscsi_task *task)
2077{
e3d2ad8c 2078 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
9ba682f0 2079
2080 log_debug(1 << CXGBI_DBG_ISCSI,
2081 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2082 task, tdata->skb, task->hdr_itt);
2083
2084 /* never reached the xmit task callout */
2085 if (tdata->skb)
2086 __kfree_skb(tdata->skb);
2087 memset(tdata, 0, sizeof(*tdata));
2088
2089 task_release_itt(task, task->hdr_itt);
2090 iscsi_tcp_cleanup_task(task);
2091}
2092EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2093
2094void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2095 struct iscsi_stats *stats)
2096{
2097 struct iscsi_conn *conn = cls_conn->dd_data;
2098
2099 stats->txdata_octets = conn->txdata_octets;
2100 stats->rxdata_octets = conn->rxdata_octets;
2101 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2102 stats->dataout_pdus = conn->dataout_pdus_cnt;
2103 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2104 stats->datain_pdus = conn->datain_pdus_cnt;
2105 stats->r2t_pdus = conn->r2t_pdus_cnt;
2106 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2107 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2108 stats->digest_err = 0;
2109 stats->timeout_err = 0;
2110 stats->custom_length = 1;
2111 strcpy(stats->custom[0].desc, "eh_abort_cnt");
2112 stats->custom[0].value = conn->eh_abort_cnt;
2113}
2114EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2115
2116static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2117{
2118 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2119 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2120 struct cxgbi_device *cdev = cconn->chba->cdev;
2121 unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2122 unsigned int max_def = 512 * MAX_SKB_FRAGS;
2123 unsigned int max = max(max_def, headroom);
2124
2125 max = min(cconn->chba->cdev->tx_max_size, max);
2126 if (conn->max_xmit_dlength)
2127 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2128 else
2129 conn->max_xmit_dlength = max;
2130 cxgbi_align_pdu_size(conn->max_xmit_dlength);
2131
2132 return 0;
2133}
2134
2135static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2136{
2137 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2138 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2139 unsigned int max = cconn->chba->cdev->rx_max_size;
2140
2141 cxgbi_align_pdu_size(max);
2142
2143 if (conn->max_recv_dlength) {
2144 if (conn->max_recv_dlength > max) {
2145 pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2146 conn->max_recv_dlength, max);
2147 return -EINVAL;
2148 }
2149 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2150 cxgbi_align_pdu_size(conn->max_recv_dlength);
2151 } else
2152 conn->max_recv_dlength = max;
2153
2154 return 0;
2155}
2156
2157int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2158 enum iscsi_param param, char *buf, int buflen)
2159{
2160 struct iscsi_conn *conn = cls_conn->dd_data;
2161 struct iscsi_session *session = conn->session;
2162 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2163 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2164 struct cxgbi_sock *csk = cconn->cep->csk;
2165 int value, err = 0;
2166
2167 log_debug(1 << CXGBI_DBG_ISCSI,
2168 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2169 cls_conn, param, buflen, buf);
2170
2171 switch (param) {
2172 case ISCSI_PARAM_HDRDGST_EN:
2173 err = iscsi_set_param(cls_conn, param, buf, buflen);
2174 if (!err && conn->hdrdgst_en)
2175 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2176 conn->hdrdgst_en,
2177 conn->datadgst_en, 0);
2178 break;
2179 case ISCSI_PARAM_DATADGST_EN:
2180 err = iscsi_set_param(cls_conn, param, buf, buflen);
2181 if (!err && conn->datadgst_en)
2182 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2183 conn->hdrdgst_en,
2184 conn->datadgst_en, 0);
2185 break;
2186 case ISCSI_PARAM_MAX_R2T:
2187 sscanf(buf, "%d", &value);
2188 if (value <= 0 || !is_power_of_2(value))
2189 return -EINVAL;
2190 if (session->max_r2t == value)
2191 break;
2192 iscsi_tcp_r2tpool_free(session);
2193 err = iscsi_set_param(cls_conn, param, buf, buflen);
2194 if (!err && iscsi_tcp_r2tpool_alloc(session))
2195 return -ENOMEM;
2196 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2197 err = iscsi_set_param(cls_conn, param, buf, buflen);
2198 if (!err)
2199 err = cxgbi_conn_max_recv_dlength(conn);
2200 break;
2201 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2202 err = iscsi_set_param(cls_conn, param, buf, buflen);
2203 if (!err)
2204 err = cxgbi_conn_max_xmit_dlength(conn);
2205 break;
2206 default:
2207 return iscsi_set_param(cls_conn, param, buf, buflen);
2208 }
2209 return err;
2210}
2211EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2212
2213int cxgbi_get_conn_param(struct iscsi_cls_conn *cls_conn,
2214 enum iscsi_param param, char *buf)
2215{
2216 struct iscsi_conn *iconn = cls_conn->dd_data;
2217 int len;
2218
2219 log_debug(1 << CXGBI_DBG_ISCSI,
2220 "cls_conn 0x%p, param %d.\n", cls_conn, param);
2221
2222 switch (param) {
2223 case ISCSI_PARAM_CONN_PORT:
2224 spin_lock_bh(&iconn->session->lock);
2225 len = sprintf(buf, "%hu\n", iconn->portal_port);
2226 spin_unlock_bh(&iconn->session->lock);
2227 break;
2228 case ISCSI_PARAM_CONN_ADDRESS:
2229 spin_lock_bh(&iconn->session->lock);
2230 len = sprintf(buf, "%s\n", iconn->portal_address);
2231 spin_unlock_bh(&iconn->session->lock);
2232 break;
2233 default:
2234 return iscsi_conn_get_param(cls_conn, param, buf);
2235 }
2236 return len;
2237}
2238EXPORT_SYMBOL_GPL(cxgbi_get_conn_param);
2239
2240struct iscsi_cls_conn *
2241cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2242{
2243 struct iscsi_cls_conn *cls_conn;
2244 struct iscsi_conn *conn;
2245 struct iscsi_tcp_conn *tcp_conn;
2246 struct cxgbi_conn *cconn;
2247
2248 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2249 if (!cls_conn)
2250 return NULL;
2251
2252 conn = cls_conn->dd_data;
2253 tcp_conn = conn->dd_data;
2254 cconn = tcp_conn->dd_data;
2255 cconn->iconn = conn;
2256
2257 log_debug(1 << CXGBI_DBG_ISCSI,
2258 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2259 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2260
2261 return cls_conn;
2262}
2263EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2264
2265int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2266 struct iscsi_cls_conn *cls_conn,
2267 u64 transport_eph, int is_leading)
2268{
2269 struct iscsi_conn *conn = cls_conn->dd_data;
2270 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2271 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2272 struct iscsi_endpoint *ep;
2273 struct cxgbi_endpoint *cep;
2274 struct cxgbi_sock *csk;
2275 int err;
2276
2277 ep = iscsi_lookup_endpoint(transport_eph);
2278 if (!ep)
2279 return -EINVAL;
2280
2281 /* setup ddp pagesize */
2282 cep = ep->dd_data;
2283 csk = cep->csk;
2284 err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid, page_idx, 0);
2285 if (err < 0)
2286 return err;
2287
2288 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2289 if (err)
2290 return -EINVAL;
2291
2292 /* calculate the tag idx bits needed for this conn based on cmds_max */
2293 cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2294
e3d2ad8c 2295 write_lock_bh(&csk->callback_lock);
9ba682f0 2296 csk->user_data = conn;
2297 cconn->chba = cep->chba;
2298 cconn->cep = cep;
2299 cep->cconn = cconn;
e3d2ad8c 2300 write_unlock_bh(&csk->callback_lock);
9ba682f0 2301
2302 cxgbi_conn_max_xmit_dlength(conn);
2303 cxgbi_conn_max_recv_dlength(conn);
2304
2305 spin_lock_bh(&conn->session->lock);
2306 sprintf(conn->portal_address, "%pI4", &csk->daddr.sin_addr.s_addr);
2307 conn->portal_port = ntohs(csk->daddr.sin_port);
2308 spin_unlock_bh(&conn->session->lock);
2309
2310 log_debug(1 << CXGBI_DBG_ISCSI,
2311 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2312 cls_session, cls_conn, ep, cconn, csk);
2313 /* init recv engine */
2314 iscsi_tcp_hdr_recv_prep(tcp_conn);
2315
2316 return 0;
2317}
2318EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2319
2320struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2321 u16 cmds_max, u16 qdepth,
2322 u32 initial_cmdsn)
2323{
2324 struct cxgbi_endpoint *cep;
2325 struct cxgbi_hba *chba;
2326 struct Scsi_Host *shost;
2327 struct iscsi_cls_session *cls_session;
2328 struct iscsi_session *session;
2329
2330 if (!ep) {
2331 pr_err("missing endpoint.\n");
2332 return NULL;
2333 }
2334
2335 cep = ep->dd_data;
2336 chba = cep->chba;
2337 shost = chba->shost;
2338
2339 BUG_ON(chba != iscsi_host_priv(shost));
2340
2341 cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2342 cmds_max, 0,
2343 sizeof(struct iscsi_tcp_task) +
2344 sizeof(struct cxgbi_task_data),
2345 initial_cmdsn, ISCSI_MAX_TARGET);
2346 if (!cls_session)
2347 return NULL;
2348
2349 session = cls_session->dd_data;
2350 if (iscsi_tcp_r2tpool_alloc(session))
2351 goto remove_session;
2352
2353 log_debug(1 << CXGBI_DBG_ISCSI,
2354 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2355 return cls_session;
2356
2357remove_session:
2358 iscsi_session_teardown(cls_session);
2359 return NULL;
2360}
2361EXPORT_SYMBOL_GPL(cxgbi_create_session);
2362
2363void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2364{
2365 log_debug(1 << CXGBI_DBG_ISCSI,
2366 "cls sess 0x%p.\n", cls_session);
2367
2368 iscsi_tcp_r2tpool_free(cls_session->dd_data);
2369 iscsi_session_teardown(cls_session);
2370}
2371EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2372
2373int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2374 char *buf, int buflen)
2375{
2376 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2377
2378 if (!chba->ndev) {
2379 shost_printk(KERN_ERR, shost, "Could not get host param. "
2380 "netdev for host not set.\n");
2381 return -ENODEV;
2382 }
2383
2384 log_debug(1 << CXGBI_DBG_ISCSI,
2385 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2386 shost, chba, chba->ndev->name, param, buflen, buf);
2387
2388 switch (param) {
2389 case ISCSI_HOST_PARAM_IPADDRESS:
2390 {
2391 __be32 addr = in_aton(buf);
2392 log_debug(1 << CXGBI_DBG_ISCSI,
2393 "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2394 cxgbi_set_iscsi_ipv4(chba, addr);
2395 return 0;
2396 }
2397 case ISCSI_HOST_PARAM_HWADDRESS:
2398 case ISCSI_HOST_PARAM_NETDEV_NAME:
2399 return 0;
2400 default:
2401 return iscsi_host_set_param(shost, param, buf, buflen);
2402 }
2403}
2404EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2405
2406int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2407 char *buf)
2408{
2409 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2410 int len = 0;
2411
2412 if (!chba->ndev) {
2413 shost_printk(KERN_ERR, shost, "Could not get host param. "
2414 "netdev for host not set.\n");
2415 return -ENODEV;
2416 }
2417
2418 log_debug(1 << CXGBI_DBG_ISCSI,
2419 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2420 shost, chba, chba->ndev->name, param);
2421
2422 switch (param) {
2423 case ISCSI_HOST_PARAM_HWADDRESS:
2424 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2425 break;
2426 case ISCSI_HOST_PARAM_NETDEV_NAME:
2427 len = sprintf(buf, "%s\n", chba->ndev->name);
2428 break;
2429 case ISCSI_HOST_PARAM_IPADDRESS:
2430 {
2431 __be32 addr;
2432
2433 addr = cxgbi_get_iscsi_ipv4(chba);
2434 len = sprintf(buf, "%pI4", &addr);
2435 log_debug(1 << CXGBI_DBG_ISCSI,
2436 "hba %s, ipv4 %pI4.\n", chba->ndev->name, &addr);
2437 break;
2438 }
2439 default:
2440 return iscsi_host_get_param(shost, param, buf);
2441 }
2442
2443 return len;
2444}
2445EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2446
2447struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2448 struct sockaddr *dst_addr,
2449 int non_blocking)
2450{
2451 struct iscsi_endpoint *ep;
2452 struct cxgbi_endpoint *cep;
2453 struct cxgbi_hba *hba = NULL;
2454 struct cxgbi_sock *csk;
2455 int err = -EINVAL;
2456
2457 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2458 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2459 shost, non_blocking, dst_addr);
2460
2461 if (shost) {
2462 hba = iscsi_host_priv(shost);
2463 if (!hba) {
2464 pr_info("shost 0x%p, priv NULL.\n", shost);
2465 goto err_out;
2466 }
2467 }
2468
2469 csk = cxgbi_check_route(dst_addr);
2470 if (IS_ERR(csk))
2471 return (struct iscsi_endpoint *)csk;
2472 cxgbi_sock_get(csk);
2473
2474 if (!hba)
2475 hba = csk->cdev->hbas[csk->port_id];
2476 else if (hba != csk->cdev->hbas[csk->port_id]) {
2477 pr_info("Could not connect through requested host %u"
2478 "hba 0x%p != 0x%p (%u).\n",
2479 shost->host_no, hba,
2480 csk->cdev->hbas[csk->port_id], csk->port_id);
2481 err = -ENOSPC;
2482 goto release_conn;
2483 }
2484
2485 err = sock_get_port(csk);
2486 if (err)
2487 goto release_conn;
2488
2489 cxgbi_sock_set_state(csk, CTP_CONNECTING);
2490 err = csk->cdev->csk_init_act_open(csk);
2491 if (err)
2492 goto release_conn;
2493
2494 if (cxgbi_sock_is_closing(csk)) {
2495 err = -ENOSPC;
2496 pr_info("csk 0x%p is closing.\n", csk);
2497 goto release_conn;
2498 }
2499
2500 ep = iscsi_create_endpoint(sizeof(*cep));
2501 if (!ep) {
2502 err = -ENOMEM;
2503 pr_info("iscsi alloc ep, OOM.\n");
2504 goto release_conn;
2505 }
2506
2507 cep = ep->dd_data;
2508 cep->csk = csk;
2509 cep->chba = hba;
2510
2511 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2512 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2513 ep, cep, csk, hba, hba->ndev->name);
2514 return ep;
2515
2516release_conn:
2517 cxgbi_sock_put(csk);
2518 cxgbi_sock_closed(csk);
2519err_out:
2520 return ERR_PTR(err);
2521}
2522EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2523
2524int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2525{
2526 struct cxgbi_endpoint *cep = ep->dd_data;
2527 struct cxgbi_sock *csk = cep->csk;
2528
2529 if (!cxgbi_sock_is_established(csk))
2530 return 0;
2531 return 1;
2532}
2533EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2534
2535void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2536{
2537 struct cxgbi_endpoint *cep = ep->dd_data;
2538 struct cxgbi_conn *cconn = cep->cconn;
2539 struct cxgbi_sock *csk = cep->csk;
2540
2541 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2542 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2543 ep, cep, cconn, csk, csk->state, csk->flags);
2544
2545 if (cconn && cconn->iconn) {
2546 iscsi_suspend_tx(cconn->iconn);
2547 write_lock_bh(&csk->callback_lock);
2548 cep->csk->user_data = NULL;
2549 cconn->cep = NULL;
2550 write_unlock_bh(&csk->callback_lock);
2551 }
2552 iscsi_destroy_endpoint(ep);
2553
2554 if (likely(csk->state >= CTP_ESTABLISHED))
2555 need_active_close(csk);
2556 else
2557 cxgbi_sock_closed(csk);
2558
2559 cxgbi_sock_put(csk);
2560}
2561EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2562
2563int cxgbi_iscsi_init(struct iscsi_transport *itp,
2564 struct scsi_transport_template **stt)
2565{
2566 *stt = iscsi_register_transport(itp);
2567 if (*stt == NULL) {
2568 pr_err("unable to register %s transport 0x%p.\n",
2569 itp->name, itp);
2570 return -ENODEV;
2571 }
2572 log_debug(1 << CXGBI_DBG_ISCSI,
2573 "%s, registered iscsi transport 0x%p.\n",
2574 itp->name, stt);
2575 return 0;
2576}
2577EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2578
2579void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2580 struct scsi_transport_template **stt)
2581{
2582 if (*stt) {
2583 log_debug(1 << CXGBI_DBG_ISCSI,
2584 "de-register transport 0x%p, %s, stt 0x%p.\n",
2585 itp, itp->name, *stt);
2586 *stt = NULL;
2587 iscsi_unregister_transport(itp);
2588 }
2589}
2590EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2591
2592static int __init libcxgbi_init_module(void)
2593{
2594 sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
2595 sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
2596
2597 pr_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
2598 ISCSI_ITT_MASK, sw_tag_idx_bits,
2599 ISCSI_AGE_MASK, sw_tag_age_bits);
2600
2601 ddp_setup_host_page_size();
2602 return 0;
2603}
2604
2605static void __exit libcxgbi_exit_module(void)
2606{
2607 cxgbi_device_unregister_all(0xFF);
2608 return;
2609}
2610
2611module_init(libcxgbi_init_module);
2612module_exit(libcxgbi_exit_module);
Linux kernel - Deliverables
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