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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{
198 struct net_device *vdev = NULL;
199 struct cxgbi_device *cdev, *tmp;
200 int i;
201
202 if (ndev->priv_flags & IFF_802_1Q_VLAN) {
203 vdev = ndev;
204 ndev = vlan_dev_real_dev(ndev);
205 log_debug(1 << CXGBI_DBG_DEV,
206 "vlan dev %s -> %s.\n", vdev->name, ndev->name);
207 }
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]) {
213 cdev->hbas[i]->vdev = vdev;
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
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(struct flowi4 *fl4,
454 __be32 saddr, __be32 daddr,
455 __be16 sport, __be16 dport, u8 tos)
456{
457 struct rtable *rt;
458
459 rt = ip_route_output_ports(&init_net, fl4, NULL, daddr, saddr,
460 dport, sport, IPPROTO_TCP, tos, 0);
461 if (IS_ERR(rt))
462 return NULL;
463
464 return rt;
465}
466
467static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr)
468{
469 struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
470 struct dst_entry *dst;
471 struct net_device *ndev;
472 struct cxgbi_device *cdev;
473 struct rtable *rt = NULL;
474 struct flowi4 fl4;
475 struct cxgbi_sock *csk = NULL;
476 unsigned int mtu = 0;
477 int port = 0xFFFF;
478 int err = 0;
479
480 if (daddr->sin_family != AF_INET) {
481 pr_info("address family 0x%x NOT supported.\n",
482 daddr->sin_family);
483 err = -EAFNOSUPPORT;
484 goto err_out;
485 }
486
487 rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0, daddr->sin_port, 0);
488 if (!rt) {
489 pr_info("no route to ipv4 0x%x, port %u.\n",
490 daddr->sin_addr.s_addr, daddr->sin_port);
491 err = -ENETUNREACH;
492 goto err_out;
493 }
494 dst = &rt->dst;
495 ndev = dst_get_neighbour(dst)->dev;
496
497 if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
498 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
499 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
500 ndev->name);
501 err = -ENETUNREACH;
502 goto rel_rt;
503 }
504
505 if (ndev->flags & IFF_LOOPBACK) {
506 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
507 mtu = ndev->mtu;
508 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
509 dst_get_neighbour(dst)->dev->name, ndev->name, mtu);
510 }
511
512 cdev = cxgbi_device_find_by_netdev(ndev, &port);
513 if (!cdev) {
514 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
515 &daddr->sin_addr.s_addr, ndev->name);
516 err = -ENETUNREACH;
517 goto rel_rt;
518 }
519 log_debug(1 << CXGBI_DBG_SOCK,
520 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
521 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
522 port, ndev->name, cdev);
523
524 csk = cxgbi_sock_create(cdev);
525 if (!csk) {
526 err = -ENOMEM;
527 goto rel_rt;
528 }
529 csk->cdev = cdev;
530 csk->port_id = port;
531 csk->mtu = mtu;
532 csk->dst = dst;
533 csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
534 csk->daddr.sin_port = daddr->sin_port;
535 csk->daddr.sin_family = daddr->sin_family;
536 csk->saddr.sin_addr.s_addr = fl4.saddr;
537
538 return csk;
539
540rel_rt:
541 ip_rt_put(rt);
542 if (csk)
543 cxgbi_sock_closed(csk);
544err_out:
545 return ERR_PTR(err);
546}
547
548void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
549 unsigned int opt)
550{
551 csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
552 dst_confirm(csk->dst);
553 smp_mb();
554 cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
555}
556EXPORT_SYMBOL_GPL(cxgbi_sock_established);
557
558static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
559{
560 log_debug(1 << CXGBI_DBG_SOCK,
561 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
562 csk, csk->state, csk->flags, csk->user_data);
563
564 if (csk->state != CTP_ESTABLISHED) {
565 read_lock_bh(&csk->callback_lock);
566 if (csk->user_data)
567 iscsi_conn_failure(csk->user_data,
568 ISCSI_ERR_CONN_FAILED);
569 read_unlock_bh(&csk->callback_lock);
570 }
571}
572
573void cxgbi_sock_closed(struct cxgbi_sock *csk)
574{
575 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
576 csk, (csk)->state, (csk)->flags, (csk)->tid);
577 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
578 if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
579 return;
580 if (csk->saddr.sin_port)
581 sock_put_port(csk);
582 if (csk->dst)
583 dst_release(csk->dst);
584 csk->cdev->csk_release_offload_resources(csk);
585 cxgbi_sock_set_state(csk, CTP_CLOSED);
586 cxgbi_inform_iscsi_conn_closing(csk);
587 cxgbi_sock_put(csk);
588}
589EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
590
591static void need_active_close(struct cxgbi_sock *csk)
592{
593 int data_lost;
594 int close_req = 0;
595
596 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
597 csk, (csk)->state, (csk)->flags, (csk)->tid);
598 spin_lock_bh(&csk->lock);
599 dst_confirm(csk->dst);
600 data_lost = skb_queue_len(&csk->receive_queue);
601 __skb_queue_purge(&csk->receive_queue);
602
603 if (csk->state == CTP_ACTIVE_OPEN)
604 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
605 else if (csk->state == CTP_ESTABLISHED) {
606 close_req = 1;
607 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
608 } else if (csk->state == CTP_PASSIVE_CLOSE) {
609 close_req = 1;
610 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
611 }
612
613 if (close_req) {
614 if (data_lost)
615 csk->cdev->csk_send_abort_req(csk);
616 else
617 csk->cdev->csk_send_close_req(csk);
618 }
619
620 spin_unlock_bh(&csk->lock);
621}
622
623void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
624{
625 pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
626 csk, csk->state, csk->flags,
627 &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
628 &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
629 errno);
630
631 cxgbi_sock_set_state(csk, CTP_CONNECTING);
632 csk->err = errno;
633 cxgbi_sock_closed(csk);
634}
635EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
636
637void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
638{
639 struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
640
641 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
642 csk, (csk)->state, (csk)->flags, (csk)->tid);
643 cxgbi_sock_get(csk);
644 spin_lock_bh(&csk->lock);
645 if (csk->state == CTP_ACTIVE_OPEN)
646 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
647 spin_unlock_bh(&csk->lock);
648 cxgbi_sock_put(csk);
649 __kfree_skb(skb);
650}
651EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
652
653void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
654{
655 cxgbi_sock_get(csk);
656 spin_lock_bh(&csk->lock);
657 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
658 if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_RCVD))
659 cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
660 else {
661 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_RCVD);
662 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
663 if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
664 pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
665 csk, csk->state, csk->flags, csk->tid);
666 cxgbi_sock_closed(csk);
667 }
668 }
669 spin_unlock_bh(&csk->lock);
670 cxgbi_sock_put(csk);
671}
672EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
673
674void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
675{
676 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
677 csk, (csk)->state, (csk)->flags, (csk)->tid);
678 cxgbi_sock_get(csk);
679 spin_lock_bh(&csk->lock);
680
681 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
682 goto done;
683
684 switch (csk->state) {
685 case CTP_ESTABLISHED:
686 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
687 break;
688 case CTP_ACTIVE_CLOSE:
689 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
690 break;
691 case CTP_CLOSE_WAIT_1:
692 cxgbi_sock_closed(csk);
693 break;
694 case CTP_ABORTING:
695 break;
696 default:
697 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
698 csk, csk->state, csk->flags, csk->tid);
699 }
700 cxgbi_inform_iscsi_conn_closing(csk);
701done:
702 spin_unlock_bh(&csk->lock);
703 cxgbi_sock_put(csk);
704}
705EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
706
707void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
708{
709 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
710 csk, (csk)->state, (csk)->flags, (csk)->tid);
711 cxgbi_sock_get(csk);
712 spin_lock_bh(&csk->lock);
713
714 csk->snd_una = snd_nxt - 1;
715 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
716 goto done;
717
718 switch (csk->state) {
719 case CTP_ACTIVE_CLOSE:
720 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
721 break;
722 case CTP_CLOSE_WAIT_1:
723 case CTP_CLOSE_WAIT_2:
724 cxgbi_sock_closed(csk);
725 break;
726 case CTP_ABORTING:
727 break;
728 default:
729 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
730 csk, csk->state, csk->flags, csk->tid);
731 }
732done:
733 spin_unlock_bh(&csk->lock);
734 cxgbi_sock_put(csk);
735}
736EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
737
738void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
739 unsigned int snd_una, int seq_chk)
740{
741 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
742 "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
743 csk, csk->state, csk->flags, csk->tid, credits,
744 csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
745
746 spin_lock_bh(&csk->lock);
747
748 csk->wr_cred += credits;
749 if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
750 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
751
752 while (credits) {
753 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
754
755 if (unlikely(!p)) {
756 pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
757 csk, csk->state, csk->flags, csk->tid, credits,
758 csk->wr_cred, csk->wr_una_cred);
759 break;
760 }
761
762 if (unlikely(credits < p->csum)) {
763 pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
764 csk, csk->state, csk->flags, csk->tid,
765 credits, csk->wr_cred, csk->wr_una_cred,
766 p->csum);
767 p->csum -= credits;
768 break;
769 } else {
770 cxgbi_sock_dequeue_wr(csk);
771 credits -= p->csum;
772 kfree_skb(p);
773 }
774 }
775
776 cxgbi_sock_check_wr_invariants(csk);
777
778 if (seq_chk) {
779 if (unlikely(before(snd_una, csk->snd_una))) {
780 pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
781 csk, csk->state, csk->flags, csk->tid, snd_una,
782 csk->snd_una);
783 goto done;
784 }
785
786 if (csk->snd_una != snd_una) {
787 csk->snd_una = snd_una;
788 dst_confirm(csk->dst);
789 }
790 }
791
792 if (skb_queue_len(&csk->write_queue)) {
793 if (csk->cdev->csk_push_tx_frames(csk, 0))
794 cxgbi_conn_tx_open(csk);
795 } else
796 cxgbi_conn_tx_open(csk);
797done:
798 spin_unlock_bh(&csk->lock);
799}
800EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
801
802static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
803 unsigned short mtu)
804{
805 int i = 0;
806
807 while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
808 ++i;
809
810 return i;
811}
812
813unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
814{
815 unsigned int idx;
816 struct dst_entry *dst = csk->dst;
817
818 csk->advmss = dst_metric_advmss(dst);
819
820 if (csk->advmss > pmtu - 40)
821 csk->advmss = pmtu - 40;
822 if (csk->advmss < csk->cdev->mtus[0] - 40)
823 csk->advmss = csk->cdev->mtus[0] - 40;
824 idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
825
826 return idx;
827}
828EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
829
830void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
831{
832 cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
833 __skb_queue_tail(&csk->write_queue, skb);
834}
835EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
836
837void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
838{
839 struct sk_buff *skb;
840
841 while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
842 kfree_skb(skb);
843}
844EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
845
846void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
847{
848 int pending = cxgbi_sock_count_pending_wrs(csk);
849
850 if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
851 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
852 csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
853}
854EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
855
856static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
857{
858 struct cxgbi_device *cdev = csk->cdev;
859 struct sk_buff *next;
860 int err, copied = 0;
861
862 spin_lock_bh(&csk->lock);
863
864 if (csk->state != CTP_ESTABLISHED) {
865 log_debug(1 << CXGBI_DBG_PDU_TX,
866 "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
867 csk, csk->state, csk->flags, csk->tid);
868 err = -EAGAIN;
869 goto out_err;
870 }
871
872 if (csk->err) {
873 log_debug(1 << CXGBI_DBG_PDU_TX,
874 "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
875 csk, csk->state, csk->flags, csk->tid, csk->err);
876 err = -EPIPE;
877 goto out_err;
878 }
879
880 if (csk->write_seq - csk->snd_una >= cdev->snd_win) {
881 log_debug(1 << CXGBI_DBG_PDU_TX,
882 "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
883 csk, csk->state, csk->flags, csk->tid, csk->write_seq,
884 csk->snd_una, cdev->snd_win);
885 err = -ENOBUFS;
886 goto out_err;
887 }
888
889 while (skb) {
890 int frags = skb_shinfo(skb)->nr_frags +
891 (skb->len != skb->data_len);
892
893 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
894 pr_err("csk 0x%p, skb head %u < %u.\n",
895 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
896 err = -EINVAL;
897 goto out_err;
898 }
899
900 if (frags >= SKB_WR_LIST_SIZE) {
901 pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
902 csk, skb_shinfo(skb)->nr_frags, skb->len,
903 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
904 err = -EINVAL;
905 goto out_err;
906 }
907
908 next = skb->next;
909 skb->next = NULL;
910 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
911 cxgbi_sock_skb_entail(csk, skb);
912 copied += skb->len;
913 csk->write_seq += skb->len +
914 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
915 skb = next;
916 }
917done:
918 if (likely(skb_queue_len(&csk->write_queue)))
919 cdev->csk_push_tx_frames(csk, 1);
920 spin_unlock_bh(&csk->lock);
921 return copied;
922
923out_err:
924 if (copied == 0 && err == -EPIPE)
925 copied = csk->err ? csk->err : -EPIPE;
926 else
927 copied = err;
928 goto done;
929}
930
931/*
932 * Direct Data Placement -
933 * Directly place the iSCSI Data-In or Data-Out PDU's payload into pre-posted
934 * final destination host-memory buffers based on the Initiator Task Tag (ITT)
935 * in Data-In or Target Task Tag (TTT) in Data-Out PDUs.
936 * The host memory address is programmed into h/w in the format of pagepod
937 * entries.
938 * The location of the pagepod entry is encoded into ddp tag which is used as
939 * the base for ITT/TTT.
940 */
941
942static unsigned char ddp_page_order[DDP_PGIDX_MAX] = {0, 1, 2, 4};
943static unsigned char ddp_page_shift[DDP_PGIDX_MAX] = {12, 13, 14, 16};
944static unsigned char page_idx = DDP_PGIDX_MAX;
945
946static unsigned char sw_tag_idx_bits;
947static unsigned char sw_tag_age_bits;
948
949/*
950 * Direct-Data Placement page size adjustment
951 */
952static int ddp_adjust_page_table(void)
953{
954 int i;
955 unsigned int base_order, order;
956
957 if (PAGE_SIZE < (1UL << ddp_page_shift[0])) {
958 pr_info("PAGE_SIZE 0x%lx too small, min 0x%lx\n",
959 PAGE_SIZE, 1UL << ddp_page_shift[0]);
960 return -EINVAL;
961 }
962
963 base_order = get_order(1UL << ddp_page_shift[0]);
964 order = get_order(1UL << PAGE_SHIFT);
965
966 for (i = 0; i < DDP_PGIDX_MAX; i++) {
967 /* first is the kernel page size, then just doubling */
968 ddp_page_order[i] = order - base_order + i;
969 ddp_page_shift[i] = PAGE_SHIFT + i;
970 }
971 return 0;
972}
973
974static int ddp_find_page_index(unsigned long pgsz)
975{
976 int i;
977
978 for (i = 0; i < DDP_PGIDX_MAX; i++) {
979 if (pgsz == (1UL << ddp_page_shift[i]))
980 return i;
981 }
982 pr_info("ddp page size %lu not supported.\n", pgsz);
983 return DDP_PGIDX_MAX;
984}
985
986static void ddp_setup_host_page_size(void)
987{
988 if (page_idx == DDP_PGIDX_MAX) {
989 page_idx = ddp_find_page_index(PAGE_SIZE);
990
991 if (page_idx == DDP_PGIDX_MAX) {
992 pr_info("system PAGE %lu, update hw.\n", PAGE_SIZE);
993 if (ddp_adjust_page_table() < 0) {
994 pr_info("PAGE %lu, disable ddp.\n", PAGE_SIZE);
995 return;
996 }
997 page_idx = ddp_find_page_index(PAGE_SIZE);
998 }
999 pr_info("system PAGE %lu, ddp idx %u.\n", PAGE_SIZE, page_idx);
1000 }
1001}
1002
1003void cxgbi_ddp_page_size_factor(int *pgsz_factor)
1004{
1005 int i;
1006
1007 for (i = 0; i < DDP_PGIDX_MAX; i++)
1008 pgsz_factor[i] = ddp_page_order[i];
1009}
1010EXPORT_SYMBOL_GPL(cxgbi_ddp_page_size_factor);
1011
1012/*
1013 * DDP setup & teardown
1014 */
1015
1016void cxgbi_ddp_ppod_set(struct cxgbi_pagepod *ppod,
1017 struct cxgbi_pagepod_hdr *hdr,
1018 struct cxgbi_gather_list *gl, unsigned int gidx)
1019{
1020 int i;
1021
1022 memcpy(ppod, hdr, sizeof(*hdr));
1023 for (i = 0; i < (PPOD_PAGES_MAX + 1); i++, gidx++) {
1024 ppod->addr[i] = gidx < gl->nelem ?
1025 cpu_to_be64(gl->phys_addr[gidx]) : 0ULL;
1026 }
1027}
1028EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_set);
1029
1030void cxgbi_ddp_ppod_clear(struct cxgbi_pagepod *ppod)
1031{
1032 memset(ppod, 0, sizeof(*ppod));
1033}
1034EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_clear);
1035
1036static inline int ddp_find_unused_entries(struct cxgbi_ddp_info *ddp,
1037 unsigned int start, unsigned int max,
1038 unsigned int count,
1039 struct cxgbi_gather_list *gl)
1040{
1041 unsigned int i, j, k;
1042
1043 /* not enough entries */
1044 if ((max - start) < count) {
1045 log_debug(1 << CXGBI_DBG_DDP,
1046 "NOT enough entries %u+%u < %u.\n", start, count, max);
1047 return -EBUSY;
1048 }
1049
1050 max -= count;
1051 spin_lock(&ddp->map_lock);
1052 for (i = start; i < max;) {
1053 for (j = 0, k = i; j < count; j++, k++) {
1054 if (ddp->gl_map[k])
1055 break;
1056 }
1057 if (j == count) {
1058 for (j = 0, k = i; j < count; j++, k++)
1059 ddp->gl_map[k] = gl;
1060 spin_unlock(&ddp->map_lock);
1061 return i;
1062 }
1063 i += j + 1;
1064 }
1065 spin_unlock(&ddp->map_lock);
1066 log_debug(1 << CXGBI_DBG_DDP,
1067 "NO suitable entries %u available.\n", count);
1068 return -EBUSY;
1069}
1070
1071static inline void ddp_unmark_entries(struct cxgbi_ddp_info *ddp,
1072 int start, int count)
1073{
1074 spin_lock(&ddp->map_lock);
1075 memset(&ddp->gl_map[start], 0,
1076 count * sizeof(struct cxgbi_gather_list *));
1077 spin_unlock(&ddp->map_lock);
1078}
1079
1080static inline void ddp_gl_unmap(struct pci_dev *pdev,
1081 struct cxgbi_gather_list *gl)
1082{
1083 int i;
1084
1085 for (i = 0; i < gl->nelem; i++)
1086 dma_unmap_page(&pdev->dev, gl->phys_addr[i], PAGE_SIZE,
1087 PCI_DMA_FROMDEVICE);
1088}
1089
1090static inline int ddp_gl_map(struct pci_dev *pdev,
1091 struct cxgbi_gather_list *gl)
1092{
1093 int i;
1094
1095 for (i = 0; i < gl->nelem; i++) {
1096 gl->phys_addr[i] = dma_map_page(&pdev->dev, gl->pages[i], 0,
1097 PAGE_SIZE,
1098 PCI_DMA_FROMDEVICE);
1099 if (unlikely(dma_mapping_error(&pdev->dev, gl->phys_addr[i]))) {
1100 log_debug(1 << CXGBI_DBG_DDP,
1101 "page %d 0x%p, 0x%p dma mapping err.\n",
1102 i, gl->pages[i], pdev);
1103 goto unmap;
1104 }
1105 }
1106 return i;
1107unmap:
1108 if (i) {
1109 unsigned int nelem = gl->nelem;
1110
1111 gl->nelem = i;
1112 ddp_gl_unmap(pdev, gl);
1113 gl->nelem = nelem;
1114 }
1115 return -EINVAL;
1116}
1117
1118static void ddp_release_gl(struct cxgbi_gather_list *gl,
1119 struct pci_dev *pdev)
1120{
1121 ddp_gl_unmap(pdev, gl);
1122 kfree(gl);
1123}
1124
1125static struct cxgbi_gather_list *ddp_make_gl(unsigned int xferlen,
1126 struct scatterlist *sgl,
1127 unsigned int sgcnt,
1128 struct pci_dev *pdev,
1129 gfp_t gfp)
1130{
1131 struct cxgbi_gather_list *gl;
1132 struct scatterlist *sg = sgl;
1133 struct page *sgpage = sg_page(sg);
1134 unsigned int sglen = sg->length;
1135 unsigned int sgoffset = sg->offset;
1136 unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >>
1137 PAGE_SHIFT;
1138 int i = 1, j = 0;
1139
1140 if (xferlen < DDP_THRESHOLD) {
1141 log_debug(1 << CXGBI_DBG_DDP,
1142 "xfer %u < threshold %u, no ddp.\n",
1143 xferlen, DDP_THRESHOLD);
1144 return NULL;
1145 }
1146
1147 gl = kzalloc(sizeof(struct cxgbi_gather_list) +
1148 npages * (sizeof(dma_addr_t) +
1149 sizeof(struct page *)), gfp);
1150 if (!gl) {
1151 log_debug(1 << CXGBI_DBG_DDP,
1152 "xfer %u, %u pages, OOM.\n", xferlen, npages);
1153 return NULL;
1154 }
1155
1156 log_debug(1 << CXGBI_DBG_DDP,
1157 "xfer %u, sgl %u, gl max %u.\n", xferlen, sgcnt, npages);
1158
1159 gl->pages = (struct page **)&gl->phys_addr[npages];
1160 gl->nelem = npages;
1161 gl->length = xferlen;
1162 gl->offset = sgoffset;
1163 gl->pages[0] = sgpage;
1164
1165 for (i = 1, sg = sg_next(sgl), j = 0; i < sgcnt;
1166 i++, sg = sg_next(sg)) {
1167 struct page *page = sg_page(sg);
1168
1169 if (sgpage == page && sg->offset == sgoffset + sglen)
1170 sglen += sg->length;
1171 else {
1172 /* make sure the sgl is fit for ddp:
1173 * each has the same page size, and
1174 * all of the middle pages are used completely
1175 */
1176 if ((j && sgoffset) || ((i != sgcnt - 1) &&
1177 ((sglen + sgoffset) & ~PAGE_MASK))) {
1178 log_debug(1 << CXGBI_DBG_DDP,
1179 "page %d/%u, %u + %u.\n",
1180 i, sgcnt, sgoffset, sglen);
1181 goto error_out;
1182 }
1183
1184 j++;
1185 if (j == gl->nelem || sg->offset) {
1186 log_debug(1 << CXGBI_DBG_DDP,
1187 "page %d/%u, offset %u.\n",
1188 j, gl->nelem, sg->offset);
1189 goto error_out;
1190 }
1191 gl->pages[j] = page;
1192 sglen = sg->length;
1193 sgoffset = sg->offset;
1194 sgpage = page;
1195 }
1196 }
1197 gl->nelem = ++j;
1198
1199 if (ddp_gl_map(pdev, gl) < 0)
1200 goto error_out;
1201
1202 return gl;
1203
1204error_out:
1205 kfree(gl);
1206 return NULL;
1207}
1208
1209static void ddp_tag_release(struct cxgbi_hba *chba, u32 tag)
1210{
1211 struct cxgbi_device *cdev = chba->cdev;
1212 struct cxgbi_ddp_info *ddp = cdev->ddp;
1213 u32 idx;
1214
1215 idx = (tag >> PPOD_IDX_SHIFT) & ddp->idx_mask;
1216 if (idx < ddp->nppods) {
1217 struct cxgbi_gather_list *gl = ddp->gl_map[idx];
1218 unsigned int npods;
1219
1220 if (!gl || !gl->nelem) {
1221 pr_warn("tag 0x%x, idx %u, gl 0x%p, %u.\n",
1222 tag, idx, gl, gl ? gl->nelem : 0);
1223 return;
1224 }
1225 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1226 log_debug(1 << CXGBI_DBG_DDP,
1227 "tag 0x%x, release idx %u, npods %u.\n",
1228 tag, idx, npods);
1229 cdev->csk_ddp_clear(chba, tag, idx, npods);
1230 ddp_unmark_entries(ddp, idx, npods);
1231 ddp_release_gl(gl, ddp->pdev);
1232 } else
1233 pr_warn("tag 0x%x, idx %u > max %u.\n", tag, idx, ddp->nppods);
1234}
1235
1236static int ddp_tag_reserve(struct cxgbi_sock *csk, unsigned int tid,
1237 u32 sw_tag, u32 *tagp, struct cxgbi_gather_list *gl,
1238 gfp_t gfp)
1239{
1240 struct cxgbi_device *cdev = csk->cdev;
1241 struct cxgbi_ddp_info *ddp = cdev->ddp;
1242 struct cxgbi_tag_format *tformat = &cdev->tag_format;
1243 struct cxgbi_pagepod_hdr hdr;
1244 unsigned int npods;
1245 int idx = -1;
1246 int err = -ENOMEM;
1247 u32 tag;
1248
1249 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1250 if (ddp->idx_last == ddp->nppods)
1251 idx = ddp_find_unused_entries(ddp, 0, ddp->nppods,
1252 npods, gl);
1253 else {
1254 idx = ddp_find_unused_entries(ddp, ddp->idx_last + 1,
1255 ddp->nppods, npods,
1256 gl);
1257 if (idx < 0 && ddp->idx_last >= npods) {
1258 idx = ddp_find_unused_entries(ddp, 0,
1259 min(ddp->idx_last + npods, ddp->nppods),
1260 npods, gl);
1261 }
1262 }
1263 if (idx < 0) {
1264 log_debug(1 << CXGBI_DBG_DDP,
1265 "xferlen %u, gl %u, npods %u NO DDP.\n",
1266 gl->length, gl->nelem, npods);
1267 return idx;
1268 }
1269
1270 tag = cxgbi_ddp_tag_base(tformat, sw_tag);
1271 tag |= idx << PPOD_IDX_SHIFT;
1272
1273 hdr.rsvd = 0;
1274 hdr.vld_tid = htonl(PPOD_VALID_FLAG | PPOD_TID(tid));
1275 hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask);
1276 hdr.max_offset = htonl(gl->length);
1277 hdr.page_offset = htonl(gl->offset);
1278
1279 err = cdev->csk_ddp_set(csk, &hdr, idx, npods, gl);
1280 if (err < 0)
1281 goto unmark_entries;
1282
1283 ddp->idx_last = idx;
1284 log_debug(1 << CXGBI_DBG_DDP,
1285 "xfer %u, gl %u,%u, tid 0x%x, tag 0x%x->0x%x(%u,%u).\n",
1286 gl->length, gl->nelem, gl->offset, tid, sw_tag, tag, idx,
1287 npods);
1288 *tagp = tag;
1289 return 0;
1290
1291unmark_entries:
1292 ddp_unmark_entries(ddp, idx, npods);
1293 return err;
1294}
1295
1296int cxgbi_ddp_reserve(struct cxgbi_sock *csk, unsigned int *tagp,
1297 unsigned int sw_tag, unsigned int xferlen,
1298 struct scatterlist *sgl, unsigned int sgcnt, gfp_t gfp)
1299{
1300 struct cxgbi_device *cdev = csk->cdev;
1301 struct cxgbi_tag_format *tformat = &cdev->tag_format;
1302 struct cxgbi_gather_list *gl;
1303 int err;
1304
1305 if (page_idx >= DDP_PGIDX_MAX || !cdev->ddp ||
1306 xferlen < DDP_THRESHOLD) {
1307 log_debug(1 << CXGBI_DBG_DDP,
1308 "pgidx %u, xfer %u, NO ddp.\n", page_idx, xferlen);
1309 return -EINVAL;
1310 }
1311
1312 if (!cxgbi_sw_tag_usable(tformat, sw_tag)) {
1313 log_debug(1 << CXGBI_DBG_DDP,
1314 "sw_tag 0x%x NOT usable.\n", sw_tag);
1315 return -EINVAL;
1316 }
1317
1318 gl = ddp_make_gl(xferlen, sgl, sgcnt, cdev->pdev, gfp);
1319 if (!gl)
1320 return -ENOMEM;
1321
1322 err = ddp_tag_reserve(csk, csk->tid, sw_tag, tagp, gl, gfp);
1323 if (err < 0)
1324 ddp_release_gl(gl, cdev->pdev);
1325
1326 return err;
1327}
1328
1329static void ddp_destroy(struct kref *kref)
1330{
1331 struct cxgbi_ddp_info *ddp = container_of(kref,
1332 struct cxgbi_ddp_info,
1333 refcnt);
1334 struct cxgbi_device *cdev = ddp->cdev;
1335 int i = 0;
1336
1337 pr_info("kref 0, destroy ddp 0x%p, cdev 0x%p.\n", ddp, cdev);
1338
1339 while (i < ddp->nppods) {
1340 struct cxgbi_gather_list *gl = ddp->gl_map[i];
1341
1342 if (gl) {
1343 int npods = (gl->nelem + PPOD_PAGES_MAX - 1)
1344 >> PPOD_PAGES_SHIFT;
1345 pr_info("cdev 0x%p, ddp %d + %d.\n", cdev, i, npods);
1346 kfree(gl);
1347 i += npods;
1348 } else
1349 i++;
1350 }
1351 cxgbi_free_big_mem(ddp);
1352}
1353
1354int cxgbi_ddp_cleanup(struct cxgbi_device *cdev)
1355{
1356 struct cxgbi_ddp_info *ddp = cdev->ddp;
1357
1358 log_debug(1 << CXGBI_DBG_DDP,
1359 "cdev 0x%p, release ddp 0x%p.\n", cdev, ddp);
1360 cdev->ddp = NULL;
1361 if (ddp)
1362 return kref_put(&ddp->refcnt, ddp_destroy);
1363 return 0;
1364}
1365EXPORT_SYMBOL_GPL(cxgbi_ddp_cleanup);
1366
1367int cxgbi_ddp_init(struct cxgbi_device *cdev,
1368 unsigned int llimit, unsigned int ulimit,
1369 unsigned int max_txsz, unsigned int max_rxsz)
1370{
1371 struct cxgbi_ddp_info *ddp;
1372 unsigned int ppmax, bits;
1373
1374 ppmax = (ulimit - llimit + 1) >> PPOD_SIZE_SHIFT;
1375 bits = __ilog2_u32(ppmax) + 1;
1376 if (bits > PPOD_IDX_MAX_SIZE)
1377 bits = PPOD_IDX_MAX_SIZE;
1378 ppmax = (1 << (bits - 1)) - 1;
1379
1380 ddp = cxgbi_alloc_big_mem(sizeof(struct cxgbi_ddp_info) +
1381 ppmax * (sizeof(struct cxgbi_gather_list *) +
1382 sizeof(struct sk_buff *)),
1383 GFP_KERNEL);
1384 if (!ddp) {
1385 pr_warn("cdev 0x%p, ddp ppmax %u OOM.\n", cdev, ppmax);
1386 return -ENOMEM;
1387 }
1388 ddp->gl_map = (struct cxgbi_gather_list **)(ddp + 1);
1389 cdev->ddp = ddp;
1390
1391 spin_lock_init(&ddp->map_lock);
1392 kref_init(&ddp->refcnt);
1393
1394 ddp->cdev = cdev;
1395 ddp->pdev = cdev->pdev;
1396 ddp->llimit = llimit;
1397 ddp->ulimit = ulimit;
1398 ddp->max_txsz = min_t(unsigned int, max_txsz, ULP2_MAX_PKT_SIZE);
1399 ddp->max_rxsz = min_t(unsigned int, max_rxsz, ULP2_MAX_PKT_SIZE);
1400 ddp->nppods = ppmax;
1401 ddp->idx_last = ppmax;
1402 ddp->idx_bits = bits;
1403 ddp->idx_mask = (1 << bits) - 1;
1404 ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1;
1405
1406 cdev->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
1407 cdev->tag_format.rsvd_bits = ddp->idx_bits;
1408 cdev->tag_format.rsvd_shift = PPOD_IDX_SHIFT;
1409 cdev->tag_format.rsvd_mask = (1 << cdev->tag_format.rsvd_bits) - 1;
1410
1411 pr_info("%s tag format, sw %u, rsvd %u,%u, mask 0x%x.\n",
1412 cdev->ports[0]->name, cdev->tag_format.sw_bits,
1413 cdev->tag_format.rsvd_bits, cdev->tag_format.rsvd_shift,
1414 cdev->tag_format.rsvd_mask);
1415
1416 cdev->tx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1417 ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
1418 cdev->rx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1419 ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);
1420
1421 log_debug(1 << CXGBI_DBG_DDP,
1422 "%s max payload size: %u/%u, %u/%u.\n",
1423 cdev->ports[0]->name, cdev->tx_max_size, ddp->max_txsz,
1424 cdev->rx_max_size, ddp->max_rxsz);
1425 return 0;
1426}
1427EXPORT_SYMBOL_GPL(cxgbi_ddp_init);
1428
1429/*
1430 * APIs interacting with open-iscsi libraries
1431 */
1432
1433static unsigned char padding[4];
1434
1435static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1436{
1437 struct scsi_cmnd *sc = task->sc;
1438 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1439 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1440 struct cxgbi_hba *chba = cconn->chba;
1441 struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1442 u32 tag = ntohl((__force u32)hdr_itt);
1443
1444 log_debug(1 << CXGBI_DBG_DDP,
1445 "cdev 0x%p, release tag 0x%x.\n", chba->cdev, tag);
1446 if (sc &&
1447 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
1448 cxgbi_is_ddp_tag(tformat, tag))
1449 ddp_tag_release(chba, tag);
1450}
1451
1452static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1453{
1454 struct scsi_cmnd *sc = task->sc;
1455 struct iscsi_conn *conn = task->conn;
1456 struct iscsi_session *sess = conn->session;
1457 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1458 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1459 struct cxgbi_hba *chba = cconn->chba;
1460 struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1461 u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
1462 u32 tag = 0;
1463 int err = -EINVAL;
1464
1465 if (sc &&
1466 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)) {
1467 err = cxgbi_ddp_reserve(cconn->cep->csk, &tag, sw_tag,
1468 scsi_in(sc)->length,
1469 scsi_in(sc)->table.sgl,
1470 scsi_in(sc)->table.nents,
1471 GFP_ATOMIC);
1472 if (err < 0)
1473 log_debug(1 << CXGBI_DBG_DDP,
1474 "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1475 cconn->cep->csk, task, scsi_in(sc)->length,
1476 scsi_in(sc)->table.nents);
1477 }
1478
1479 if (err < 0)
1480 tag = cxgbi_set_non_ddp_tag(tformat, sw_tag);
1481 /* the itt need to sent in big-endian order */
1482 *hdr_itt = (__force itt_t)htonl(tag);
1483
1484 log_debug(1 << CXGBI_DBG_DDP,
1485 "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1486 chba->cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1487 return 0;
1488}
1489
1490void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1491{
1492 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1493 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1494 struct cxgbi_device *cdev = cconn->chba->cdev;
1495 u32 tag = ntohl((__force u32) itt);
1496 u32 sw_bits;
1497
1498 sw_bits = cxgbi_tag_nonrsvd_bits(&cdev->tag_format, tag);
1499 if (idx)
1500 *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
1501 if (age)
1502 *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
1503
1504 log_debug(1 << CXGBI_DBG_DDP,
1505 "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1506 cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1507 age ? *age : 0xFF);
1508}
1509EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1510
1511void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1512{
1513 struct iscsi_conn *conn = csk->user_data;
1514
1515 if (conn) {
1516 log_debug(1 << CXGBI_DBG_SOCK,
1517 "csk 0x%p, cid %d.\n", csk, conn->id);
1518 iscsi_conn_queue_work(conn);
1519 }
1520}
1521EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1522
1523/*
1524 * pdu receive, interact with libiscsi_tcp
1525 */
1526static inline int read_pdu_skb(struct iscsi_conn *conn,
1527 struct sk_buff *skb,
1528 unsigned int offset,
1529 int offloaded)
1530{
1531 int status = 0;
1532 int bytes_read;
1533
1534 bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1535 switch (status) {
1536 case ISCSI_TCP_CONN_ERR:
1537 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1538 skb, offset, offloaded);
1539 return -EIO;
1540 case ISCSI_TCP_SUSPENDED:
1541 log_debug(1 << CXGBI_DBG_PDU_RX,
1542 "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1543 skb, offset, offloaded, bytes_read);
1544 /* no transfer - just have caller flush queue */
1545 return bytes_read;
1546 case ISCSI_TCP_SKB_DONE:
1547 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1548 skb, offset, offloaded);
1549 /*
1550 * pdus should always fit in the skb and we should get
1551 * segment done notifcation.
1552 */
1553 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1554 return -EFAULT;
1555 case ISCSI_TCP_SEGMENT_DONE:
1556 log_debug(1 << CXGBI_DBG_PDU_RX,
1557 "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1558 skb, offset, offloaded, bytes_read);
1559 return bytes_read;
1560 default:
1561 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1562 skb, offset, offloaded, status);
1563 return -EINVAL;
1564 }
1565}
1566
1567static int skb_read_pdu_bhs(struct iscsi_conn *conn, struct sk_buff *skb)
1568{
1569 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1570
1571 log_debug(1 << CXGBI_DBG_PDU_RX,
1572 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1573 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1574
1575 if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1576 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1577 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1578 return -EIO;
1579 }
1580
1581 if (conn->hdrdgst_en &&
1582 cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1583 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1584 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1585 return -EIO;
1586 }
1587
1588 return read_pdu_skb(conn, skb, 0, 0);
1589}
1590
1591static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1592 struct sk_buff *skb, unsigned int offset)
1593{
1594 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1595 bool offloaded = 0;
1596 int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1597
1598 log_debug(1 << CXGBI_DBG_PDU_RX,
1599 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1600 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1601
1602 if (conn->datadgst_en &&
1603 cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1604 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1605 conn, lskb, cxgbi_skcb_flags(lskb));
1606 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1607 return -EIO;
1608 }
1609
1610 if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1611 return 0;
1612
1613 /* coalesced, add header digest length */
1614 if (lskb == skb && conn->hdrdgst_en)
1615 offset += ISCSI_DIGEST_SIZE;
1616
1617 if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1618 offloaded = 1;
1619
1620 if (opcode == ISCSI_OP_SCSI_DATA_IN)
1621 log_debug(1 << CXGBI_DBG_PDU_RX,
1622 "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1623 skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1624 tcp_conn->in.datalen, offloaded ? "is" : "not");
1625
1626 return read_pdu_skb(conn, skb, offset, offloaded);
1627}
1628
1629static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1630{
1631 struct cxgbi_device *cdev = csk->cdev;
1632 int must_send;
1633 u32 credits;
1634
1635 log_debug(1 << CXGBI_DBG_PDU_RX,
1636 "csk 0x%p,%u,0x%lu,%u, seq %u, wup %u, thre %u, %u.\n",
1637 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1638 csk->rcv_wup, cdev->rx_credit_thres,
1639 cdev->rcv_win);
1640
1641 if (csk->state != CTP_ESTABLISHED)
1642 return;
1643
1644 credits = csk->copied_seq - csk->rcv_wup;
1645 if (unlikely(!credits))
1646 return;
1647 if (unlikely(cdev->rx_credit_thres == 0))
1648 return;
1649
1650 must_send = credits + 16384 >= cdev->rcv_win;
1651 if (must_send || credits >= cdev->rx_credit_thres)
1652 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1653}
1654
1655void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1656{
1657 struct cxgbi_device *cdev = csk->cdev;
1658 struct iscsi_conn *conn = csk->user_data;
1659 struct sk_buff *skb;
1660 unsigned int read = 0;
1661 int err = 0;
1662
1663 log_debug(1 << CXGBI_DBG_PDU_RX,
1664 "csk 0x%p, conn 0x%p.\n", csk, conn);
1665
1666 if (unlikely(!conn || conn->suspend_rx)) {
1667 log_debug(1 << CXGBI_DBG_PDU_RX,
1668 "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1669 csk, conn, conn ? conn->id : 0xFF,
1670 conn ? conn->suspend_rx : 0xFF);
1671 return;
1672 }
1673
1674 while (!err) {
1675 skb = skb_peek(&csk->receive_queue);
1676 if (!skb ||
1677 !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1678 if (skb)
1679 log_debug(1 << CXGBI_DBG_PDU_RX,
1680 "skb 0x%p, NOT ready 0x%lx.\n",
1681 skb, cxgbi_skcb_flags(skb));
1682 break;
1683 }
1684 __skb_unlink(skb, &csk->receive_queue);
1685
1686 read += cxgbi_skcb_rx_pdulen(skb);
1687 log_debug(1 << CXGBI_DBG_PDU_RX,
1688 "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1689 csk, skb, skb->len, cxgbi_skcb_flags(skb),
1690 cxgbi_skcb_rx_pdulen(skb));
1691
1692 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1693 err = skb_read_pdu_bhs(conn, skb);
1694 if (err < 0) {
1695 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1696 "f 0x%lx, plen %u.\n",
1697 csk, skb, skb->len,
1698 cxgbi_skcb_flags(skb),
1699 cxgbi_skcb_rx_pdulen(skb));
1700 goto skb_done;
1701 }
1702 err = skb_read_pdu_data(conn, skb, skb,
1703 err + cdev->skb_rx_extra);
1704 if (err < 0)
1705 pr_err("coalesced data, 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 } else {
1711 err = skb_read_pdu_bhs(conn, skb);
1712 if (err < 0) {
1713 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1714 "f 0x%lx, plen %u.\n",
1715 csk, skb, skb->len,
1716 cxgbi_skcb_flags(skb),
1717 cxgbi_skcb_rx_pdulen(skb));
1718 goto skb_done;
1719 }
1720
1721 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1722 struct sk_buff *dskb;
1723
1724 dskb = skb_peek(&csk->receive_queue);
1725 if (!dskb) {
1726 pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1727 " plen %u, NO data.\n",
1728 csk, skb, skb->len,
1729 cxgbi_skcb_flags(skb),
1730 cxgbi_skcb_rx_pdulen(skb));
1731 err = -EIO;
1732 goto skb_done;
1733 }
1734 __skb_unlink(dskb, &csk->receive_queue);
1735
1736 err = skb_read_pdu_data(conn, skb, dskb, 0);
1737 if (err < 0)
1738 pr_err("data, csk 0x%p, skb 0x%p,%u, "
1739 "f 0x%lx, plen %u, dskb 0x%p,"
1740 "%u.\n",
1741 csk, skb, skb->len,
1742 cxgbi_skcb_flags(skb),
1743 cxgbi_skcb_rx_pdulen(skb),
1744 dskb, dskb->len);
1745 __kfree_skb(dskb);
1746 } else
1747 err = skb_read_pdu_data(conn, skb, skb, 0);
1748 }
1749skb_done:
1750 __kfree_skb(skb);
1751
1752 if (err < 0)
1753 break;
1754 }
1755
1756 log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
1757 if (read) {
1758 csk->copied_seq += read;
1759 csk_return_rx_credits(csk, read);
1760 conn->rxdata_octets += read;
1761 }
1762
1763 if (err < 0) {
1764 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
1765 csk, conn, err, read);
1766 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1767 }
1768}
1769EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
1770
1771static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
1772 unsigned int offset, unsigned int *off,
1773 struct scatterlist **sgp)
1774{
1775 int i;
1776 struct scatterlist *sg;
1777
1778 for_each_sg(sgl, sg, sgcnt, i) {
1779 if (offset < sg->length) {
1780 *off = offset;
1781 *sgp = sg;
1782 return 0;
1783 }
1784 offset -= sg->length;
1785 }
1786 return -EFAULT;
1787}
1788
1789static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
1790 unsigned int dlen, skb_frag_t *frags,
1791 int frag_max)
1792{
1793 unsigned int datalen = dlen;
1794 unsigned int sglen = sg->length - sgoffset;
1795 struct page *page = sg_page(sg);
1796 int i;
1797
1798 i = 0;
1799 do {
1800 unsigned int copy;
1801
1802 if (!sglen) {
1803 sg = sg_next(sg);
1804 if (!sg) {
1805 pr_warn("sg %d NULL, len %u/%u.\n",
1806 i, datalen, dlen);
1807 return -EINVAL;
1808 }
1809 sgoffset = 0;
1810 sglen = sg->length;
1811 page = sg_page(sg);
1812
1813 }
1814 copy = min(datalen, sglen);
1815 if (i && page == frags[i - 1].page &&
1816 sgoffset + sg->offset ==
1817 frags[i - 1].page_offset + frags[i - 1].size) {
1818 frags[i - 1].size += copy;
1819 } else {
1820 if (i >= frag_max) {
1821 pr_warn("too many pages %u, dlen %u.\n",
1822 frag_max, dlen);
1823 return -EINVAL;
1824 }
1825
1826 frags[i].page = page;
1827 frags[i].page_offset = sg->offset + sgoffset;
1828 frags[i].size = copy;
1829 i++;
1830 }
1831 datalen -= copy;
1832 sgoffset += copy;
1833 sglen -= copy;
1834 } while (datalen);
1835
1836 return i;
1837}
1838
1839int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
1840{
1841 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1842 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1843 struct cxgbi_device *cdev = cconn->chba->cdev;
1844 struct iscsi_conn *conn = task->conn;
1845 struct iscsi_tcp_task *tcp_task = task->dd_data;
1846 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1847 struct scsi_cmnd *sc = task->sc;
1848 int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
1849
1850 tcp_task->dd_data = tdata;
1851 task->hdr = NULL;
1852
1853 if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
1854 (opcode == ISCSI_OP_SCSI_DATA_OUT ||
1855 (opcode == ISCSI_OP_SCSI_CMD &&
1856 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
1857 /* data could goes into skb head */
1858 headroom += min_t(unsigned int,
1859 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
1860 conn->max_xmit_dlength);
1861
1862 tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
1863 if (!tdata->skb) {
1864 pr_warn("alloc skb %u+%u, opcode 0x%x failed.\n",
1865 cdev->skb_tx_rsvd, headroom, opcode);
1866 return -ENOMEM;
1867 }
1868
1869 skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
1870 task->hdr = (struct iscsi_hdr *)tdata->skb->data;
1871 task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
1872
1873 /* data_out uses scsi_cmd's itt */
1874 if (opcode != ISCSI_OP_SCSI_DATA_OUT)
1875 task_reserve_itt(task, &task->hdr->itt);
1876
1877 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1878 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
1879 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
1880 conn->max_xmit_dlength, ntohl(task->hdr->itt));
1881
1882 return 0;
1883}
1884EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
1885
1886static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
1887{
1888 if (hcrc || dcrc) {
1889 u8 submode = 0;
1890
1891 if (hcrc)
1892 submode |= 1;
1893 if (dcrc)
1894 submode |= 2;
1895 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
1896 } else
1897 cxgbi_skcb_ulp_mode(skb) = 0;
1898}
1899
1900int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
1901 unsigned int count)
1902{
1903 struct iscsi_conn *conn = task->conn;
1904 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1905 struct sk_buff *skb = tdata->skb;
1906 unsigned int datalen = count;
1907 int i, padlen = iscsi_padding(count);
1908 struct page *pg;
1909
1910 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1911 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
1912 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
1913 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
1914
1915 skb_put(skb, task->hdr_len);
1916 tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
1917 if (!count)
1918 return 0;
1919
1920 if (task->sc) {
1921 struct scsi_data_buffer *sdb = scsi_out(task->sc);
1922 struct scatterlist *sg = NULL;
1923 int err;
1924
1925 tdata->offset = offset;
1926 tdata->count = count;
1927 err = sgl_seek_offset(
1928 sdb->table.sgl, sdb->table.nents,
1929 tdata->offset, &tdata->sgoffset, &sg);
1930 if (err < 0) {
1931 pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
1932 sdb->table.nents, tdata->offset, sdb->length);
1933 return err;
1934 }
1935 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
1936 tdata->frags, MAX_PDU_FRAGS);
1937 if (err < 0) {
1938 pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
1939 sdb->table.nents, tdata->offset, tdata->count);
1940 return err;
1941 }
1942 tdata->nr_frags = err;
1943
1944 if (tdata->nr_frags > MAX_SKB_FRAGS ||
1945 (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
1946 char *dst = skb->data + task->hdr_len;
1947 skb_frag_t *frag = tdata->frags;
1948
1949 /* data fits in the skb's headroom */
1950 for (i = 0; i < tdata->nr_frags; i++, frag++) {
1951 char *src = kmap_atomic(frag->page,
1952 KM_SOFTIRQ0);
1953
1954 memcpy(dst, src+frag->page_offset, frag->size);
1955 dst += frag->size;
1956 kunmap_atomic(src, KM_SOFTIRQ0);
1957 }
1958 if (padlen) {
1959 memset(dst, 0, padlen);
1960 padlen = 0;
1961 }
1962 skb_put(skb, count + padlen);
1963 } else {
1964 /* data fit into frag_list */
1965 for (i = 0; i < tdata->nr_frags; i++)
1966 get_page(tdata->frags[i].page);
1967
1968 memcpy(skb_shinfo(skb)->frags, tdata->frags,
1969 sizeof(skb_frag_t) * tdata->nr_frags);
1970 skb_shinfo(skb)->nr_frags = tdata->nr_frags;
1971 skb->len += count;
1972 skb->data_len += count;
1973 skb->truesize += count;
1974 }
1975
1976 } else {
1977 pg = virt_to_page(task->data);
1978
1979 get_page(pg);
1980 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
1981 count);
1982 skb->len += count;
1983 skb->data_len += count;
1984 skb->truesize += count;
1985 }
1986
1987 if (padlen) {
1988 i = skb_shinfo(skb)->nr_frags;
1989 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
1990 virt_to_page(padding), offset_in_page(padding),
1991 padlen);
1992
1993 skb->data_len += padlen;
1994 skb->truesize += padlen;
1995 skb->len += padlen;
1996 }
1997
1998 return 0;
1999}
2000EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
2001
2002int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2003{
2004 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2005 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2006 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2007 struct sk_buff *skb = tdata->skb;
2008 unsigned int datalen;
2009 int err;
2010
2011 if (!skb) {
2012 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2013 "task 0x%p, skb NULL.\n", task);
2014 return 0;
2015 }
2016
2017 datalen = skb->data_len;
2018 tdata->skb = NULL;
2019 err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2020 if (err > 0) {
2021 int pdulen = err;
2022
2023 log_debug(1 << CXGBI_DBG_PDU_TX,
2024 "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2025 task, task->sc, skb, skb->len, skb->data_len, err);
2026
2027 if (task->conn->hdrdgst_en)
2028 pdulen += ISCSI_DIGEST_SIZE;
2029
2030 if (datalen && task->conn->datadgst_en)
2031 pdulen += ISCSI_DIGEST_SIZE;
2032
2033 task->conn->txdata_octets += pdulen;
2034 return 0;
2035 }
2036
2037 if (err == -EAGAIN || err == -ENOBUFS) {
2038 log_debug(1 << CXGBI_DBG_PDU_TX,
2039 "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2040 task, skb, skb->len, skb->data_len, err);
2041 /* reset skb to send when we are called again */
2042 tdata->skb = skb;
2043 return err;
2044 }
2045
2046 kfree_skb(skb);
2047 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2048 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2049 task->itt, skb, skb->len, skb->data_len, err);
2050 iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2051 iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2052 return err;
2053}
2054EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2055
2056void cxgbi_cleanup_task(struct iscsi_task *task)
2057{
2058 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2059
2060 log_debug(1 << CXGBI_DBG_ISCSI,
2061 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2062 task, tdata->skb, task->hdr_itt);
2063
2064 /* never reached the xmit task callout */
2065 if (tdata->skb)
2066 __kfree_skb(tdata->skb);
2067 memset(tdata, 0, sizeof(*tdata));
2068
2069 task_release_itt(task, task->hdr_itt);
2070 iscsi_tcp_cleanup_task(task);
2071}
2072EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2073
2074void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2075 struct iscsi_stats *stats)
2076{
2077 struct iscsi_conn *conn = cls_conn->dd_data;
2078
2079 stats->txdata_octets = conn->txdata_octets;
2080 stats->rxdata_octets = conn->rxdata_octets;
2081 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2082 stats->dataout_pdus = conn->dataout_pdus_cnt;
2083 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2084 stats->datain_pdus = conn->datain_pdus_cnt;
2085 stats->r2t_pdus = conn->r2t_pdus_cnt;
2086 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2087 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2088 stats->digest_err = 0;
2089 stats->timeout_err = 0;
2090 stats->custom_length = 1;
2091 strcpy(stats->custom[0].desc, "eh_abort_cnt");
2092 stats->custom[0].value = conn->eh_abort_cnt;
2093}
2094EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2095
2096static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2097{
2098 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2099 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2100 struct cxgbi_device *cdev = cconn->chba->cdev;
2101 unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2102 unsigned int max_def = 512 * MAX_SKB_FRAGS;
2103 unsigned int max = max(max_def, headroom);
2104
2105 max = min(cconn->chba->cdev->tx_max_size, max);
2106 if (conn->max_xmit_dlength)
2107 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2108 else
2109 conn->max_xmit_dlength = max;
2110 cxgbi_align_pdu_size(conn->max_xmit_dlength);
2111
2112 return 0;
2113}
2114
2115static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2116{
2117 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2118 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2119 unsigned int max = cconn->chba->cdev->rx_max_size;
2120
2121 cxgbi_align_pdu_size(max);
2122
2123 if (conn->max_recv_dlength) {
2124 if (conn->max_recv_dlength > max) {
2125 pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2126 conn->max_recv_dlength, max);
2127 return -EINVAL;
2128 }
2129 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2130 cxgbi_align_pdu_size(conn->max_recv_dlength);
2131 } else
2132 conn->max_recv_dlength = max;
2133
2134 return 0;
2135}
2136
2137int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2138 enum iscsi_param param, char *buf, int buflen)
2139{
2140 struct iscsi_conn *conn = cls_conn->dd_data;
2141 struct iscsi_session *session = conn->session;
2142 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2143 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2144 struct cxgbi_sock *csk = cconn->cep->csk;
2145 int value, err = 0;
2146
2147 log_debug(1 << CXGBI_DBG_ISCSI,
2148 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2149 cls_conn, param, buflen, buf);
2150
2151 switch (param) {
2152 case ISCSI_PARAM_HDRDGST_EN:
2153 err = iscsi_set_param(cls_conn, param, buf, buflen);
2154 if (!err && conn->hdrdgst_en)
2155 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2156 conn->hdrdgst_en,
2157 conn->datadgst_en, 0);
2158 break;
2159 case ISCSI_PARAM_DATADGST_EN:
2160 err = iscsi_set_param(cls_conn, param, buf, buflen);
2161 if (!err && conn->datadgst_en)
2162 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2163 conn->hdrdgst_en,
2164 conn->datadgst_en, 0);
2165 break;
2166 case ISCSI_PARAM_MAX_R2T:
2167 sscanf(buf, "%d", &value);
2168 if (value <= 0 || !is_power_of_2(value))
2169 return -EINVAL;
2170 if (session->max_r2t == value)
2171 break;
2172 iscsi_tcp_r2tpool_free(session);
2173 err = iscsi_set_param(cls_conn, param, buf, buflen);
2174 if (!err && iscsi_tcp_r2tpool_alloc(session))
2175 return -ENOMEM;
2176 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2177 err = iscsi_set_param(cls_conn, param, buf, buflen);
2178 if (!err)
2179 err = cxgbi_conn_max_recv_dlength(conn);
2180 break;
2181 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2182 err = iscsi_set_param(cls_conn, param, buf, buflen);
2183 if (!err)
2184 err = cxgbi_conn_max_xmit_dlength(conn);
2185 break;
2186 default:
2187 return iscsi_set_param(cls_conn, param, buf, buflen);
2188 }
2189 return err;
2190}
2191EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2192
2193int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2194 char *buf)
2195{
2196 struct cxgbi_endpoint *cep = ep->dd_data;
2197 struct cxgbi_sock *csk;
2198 int len;
2199
2200 log_debug(1 << CXGBI_DBG_ISCSI,
2201 "cls_conn 0x%p, param %d.\n", ep, param);
2202
2203 switch (param) {
2204 case ISCSI_PARAM_CONN_PORT:
2205 case ISCSI_PARAM_CONN_ADDRESS:
2206 if (!cep)
2207 return -ENOTCONN;
2208
2209 csk = cep->csk;
2210 if (!csk)
2211 return -ENOTCONN;
2212
2213 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2214 &csk->daddr, param, buf);
2215 default:
2216 return -ENOSYS;
2217 }
2218 return len;
2219}
2220EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
2221
2222struct iscsi_cls_conn *
2223cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2224{
2225 struct iscsi_cls_conn *cls_conn;
2226 struct iscsi_conn *conn;
2227 struct iscsi_tcp_conn *tcp_conn;
2228 struct cxgbi_conn *cconn;
2229
2230 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2231 if (!cls_conn)
2232 return NULL;
2233
2234 conn = cls_conn->dd_data;
2235 tcp_conn = conn->dd_data;
2236 cconn = tcp_conn->dd_data;
2237 cconn->iconn = conn;
2238
2239 log_debug(1 << CXGBI_DBG_ISCSI,
2240 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2241 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2242
2243 return cls_conn;
2244}
2245EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2246
2247int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2248 struct iscsi_cls_conn *cls_conn,
2249 u64 transport_eph, int is_leading)
2250{
2251 struct iscsi_conn *conn = cls_conn->dd_data;
2252 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2253 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2254 struct iscsi_endpoint *ep;
2255 struct cxgbi_endpoint *cep;
2256 struct cxgbi_sock *csk;
2257 int err;
2258
2259 ep = iscsi_lookup_endpoint(transport_eph);
2260 if (!ep)
2261 return -EINVAL;
2262
2263 /* setup ddp pagesize */
2264 cep = ep->dd_data;
2265 csk = cep->csk;
2266 err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid, page_idx, 0);
2267 if (err < 0)
2268 return err;
2269
2270 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2271 if (err)
2272 return -EINVAL;
2273
2274 /* calculate the tag idx bits needed for this conn based on cmds_max */
2275 cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2276
2277 write_lock_bh(&csk->callback_lock);
2278 csk->user_data = conn;
2279 cconn->chba = cep->chba;
2280 cconn->cep = cep;
2281 cep->cconn = cconn;
2282 write_unlock_bh(&csk->callback_lock);
2283
2284 cxgbi_conn_max_xmit_dlength(conn);
2285 cxgbi_conn_max_recv_dlength(conn);
2286
2287 log_debug(1 << CXGBI_DBG_ISCSI,
2288 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2289 cls_session, cls_conn, ep, cconn, csk);
2290 /* init recv engine */
2291 iscsi_tcp_hdr_recv_prep(tcp_conn);
2292
2293 return 0;
2294}
2295EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2296
2297struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2298 u16 cmds_max, u16 qdepth,
2299 u32 initial_cmdsn)
2300{
2301 struct cxgbi_endpoint *cep;
2302 struct cxgbi_hba *chba;
2303 struct Scsi_Host *shost;
2304 struct iscsi_cls_session *cls_session;
2305 struct iscsi_session *session;
2306
2307 if (!ep) {
2308 pr_err("missing endpoint.\n");
2309 return NULL;
2310 }
2311
2312 cep = ep->dd_data;
2313 chba = cep->chba;
2314 shost = chba->shost;
2315
2316 BUG_ON(chba != iscsi_host_priv(shost));
2317
2318 cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2319 cmds_max, 0,
2320 sizeof(struct iscsi_tcp_task) +
2321 sizeof(struct cxgbi_task_data),
2322 initial_cmdsn, ISCSI_MAX_TARGET);
2323 if (!cls_session)
2324 return NULL;
2325
2326 session = cls_session->dd_data;
2327 if (iscsi_tcp_r2tpool_alloc(session))
2328 goto remove_session;
2329
2330 log_debug(1 << CXGBI_DBG_ISCSI,
2331 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2332 return cls_session;
2333
2334remove_session:
2335 iscsi_session_teardown(cls_session);
2336 return NULL;
2337}
2338EXPORT_SYMBOL_GPL(cxgbi_create_session);
2339
2340void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2341{
2342 log_debug(1 << CXGBI_DBG_ISCSI,
2343 "cls sess 0x%p.\n", cls_session);
2344
2345 iscsi_tcp_r2tpool_free(cls_session->dd_data);
2346 iscsi_session_teardown(cls_session);
2347}
2348EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2349
2350int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2351 char *buf, int buflen)
2352{
2353 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2354
2355 if (!chba->ndev) {
2356 shost_printk(KERN_ERR, shost, "Could not get host param. "
2357 "netdev for host not set.\n");
2358 return -ENODEV;
2359 }
2360
2361 log_debug(1 << CXGBI_DBG_ISCSI,
2362 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2363 shost, chba, chba->ndev->name, param, buflen, buf);
2364
2365 switch (param) {
2366 case ISCSI_HOST_PARAM_IPADDRESS:
2367 {
2368 __be32 addr = in_aton(buf);
2369 log_debug(1 << CXGBI_DBG_ISCSI,
2370 "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2371 cxgbi_set_iscsi_ipv4(chba, addr);
2372 return 0;
2373 }
2374 case ISCSI_HOST_PARAM_HWADDRESS:
2375 case ISCSI_HOST_PARAM_NETDEV_NAME:
2376 return 0;
2377 default:
2378 return iscsi_host_set_param(shost, param, buf, buflen);
2379 }
2380}
2381EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2382
2383int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2384 char *buf)
2385{
2386 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2387 int len = 0;
2388
2389 if (!chba->ndev) {
2390 shost_printk(KERN_ERR, shost, "Could not get host param. "
2391 "netdev for host not set.\n");
2392 return -ENODEV;
2393 }
2394
2395 log_debug(1 << CXGBI_DBG_ISCSI,
2396 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2397 shost, chba, chba->ndev->name, param);
2398
2399 switch (param) {
2400 case ISCSI_HOST_PARAM_HWADDRESS:
2401 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2402 break;
2403 case ISCSI_HOST_PARAM_NETDEV_NAME:
2404 len = sprintf(buf, "%s\n", chba->ndev->name);
2405 break;
2406 case ISCSI_HOST_PARAM_IPADDRESS:
2407 {
2408 __be32 addr;
2409
2410 addr = cxgbi_get_iscsi_ipv4(chba);
2411 len = sprintf(buf, "%pI4", &addr);
2412 log_debug(1 << CXGBI_DBG_ISCSI,
2413 "hba %s, ipv4 %pI4.\n", chba->ndev->name, &addr);
2414 break;
2415 }
2416 default:
2417 return iscsi_host_get_param(shost, param, buf);
2418 }
2419
2420 return len;
2421}
2422EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2423
2424struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2425 struct sockaddr *dst_addr,
2426 int non_blocking)
2427{
2428 struct iscsi_endpoint *ep;
2429 struct cxgbi_endpoint *cep;
2430 struct cxgbi_hba *hba = NULL;
2431 struct cxgbi_sock *csk;
2432 int err = -EINVAL;
2433
2434 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2435 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2436 shost, non_blocking, dst_addr);
2437
2438 if (shost) {
2439 hba = iscsi_host_priv(shost);
2440 if (!hba) {
2441 pr_info("shost 0x%p, priv NULL.\n", shost);
2442 goto err_out;
2443 }
2444 }
2445
2446 csk = cxgbi_check_route(dst_addr);
2447 if (IS_ERR(csk))
2448 return (struct iscsi_endpoint *)csk;
2449 cxgbi_sock_get(csk);
2450
2451 if (!hba)
2452 hba = csk->cdev->hbas[csk->port_id];
2453 else if (hba != csk->cdev->hbas[csk->port_id]) {
2454 pr_info("Could not connect through requested host %u"
2455 "hba 0x%p != 0x%p (%u).\n",
2456 shost->host_no, hba,
2457 csk->cdev->hbas[csk->port_id], csk->port_id);
2458 err = -ENOSPC;
2459 goto release_conn;
2460 }
2461
2462 err = sock_get_port(csk);
2463 if (err)
2464 goto release_conn;
2465
2466 cxgbi_sock_set_state(csk, CTP_CONNECTING);
2467 err = csk->cdev->csk_init_act_open(csk);
2468 if (err)
2469 goto release_conn;
2470
2471 if (cxgbi_sock_is_closing(csk)) {
2472 err = -ENOSPC;
2473 pr_info("csk 0x%p is closing.\n", csk);
2474 goto release_conn;
2475 }
2476
2477 ep = iscsi_create_endpoint(sizeof(*cep));
2478 if (!ep) {
2479 err = -ENOMEM;
2480 pr_info("iscsi alloc ep, OOM.\n");
2481 goto release_conn;
2482 }
2483
2484 cep = ep->dd_data;
2485 cep->csk = csk;
2486 cep->chba = hba;
2487
2488 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2489 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2490 ep, cep, csk, hba, hba->ndev->name);
2491 return ep;
2492
2493release_conn:
2494 cxgbi_sock_put(csk);
2495 cxgbi_sock_closed(csk);
2496err_out:
2497 return ERR_PTR(err);
2498}
2499EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2500
2501int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2502{
2503 struct cxgbi_endpoint *cep = ep->dd_data;
2504 struct cxgbi_sock *csk = cep->csk;
2505
2506 if (!cxgbi_sock_is_established(csk))
2507 return 0;
2508 return 1;
2509}
2510EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2511
2512void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2513{
2514 struct cxgbi_endpoint *cep = ep->dd_data;
2515 struct cxgbi_conn *cconn = cep->cconn;
2516 struct cxgbi_sock *csk = cep->csk;
2517
2518 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2519 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2520 ep, cep, cconn, csk, csk->state, csk->flags);
2521
2522 if (cconn && cconn->iconn) {
2523 iscsi_suspend_tx(cconn->iconn);
2524 write_lock_bh(&csk->callback_lock);
2525 cep->csk->user_data = NULL;
2526 cconn->cep = NULL;
2527 write_unlock_bh(&csk->callback_lock);
2528 }
2529 iscsi_destroy_endpoint(ep);
2530
2531 if (likely(csk->state >= CTP_ESTABLISHED))
2532 need_active_close(csk);
2533 else
2534 cxgbi_sock_closed(csk);
2535
2536 cxgbi_sock_put(csk);
2537}
2538EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2539
2540int cxgbi_iscsi_init(struct iscsi_transport *itp,
2541 struct scsi_transport_template **stt)
2542{
2543 *stt = iscsi_register_transport(itp);
2544 if (*stt == NULL) {
2545 pr_err("unable to register %s transport 0x%p.\n",
2546 itp->name, itp);
2547 return -ENODEV;
2548 }
2549 log_debug(1 << CXGBI_DBG_ISCSI,
2550 "%s, registered iscsi transport 0x%p.\n",
2551 itp->name, stt);
2552 return 0;
2553}
2554EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2555
2556void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2557 struct scsi_transport_template **stt)
2558{
2559 if (*stt) {
2560 log_debug(1 << CXGBI_DBG_ISCSI,
2561 "de-register transport 0x%p, %s, stt 0x%p.\n",
2562 itp, itp->name, *stt);
2563 *stt = NULL;
2564 iscsi_unregister_transport(itp);
2565 }
2566}
2567EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2568
2569static int __init libcxgbi_init_module(void)
2570{
2571 sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
2572 sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
2573
2574 pr_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
2575 ISCSI_ITT_MASK, sw_tag_idx_bits,
2576 ISCSI_AGE_MASK, sw_tag_age_bits);
2577
2578 ddp_setup_host_page_size();
2579 return 0;
2580}
2581
2582static void __exit libcxgbi_exit_module(void)
2583{
2584 cxgbi_device_unregister_all(0xFF);
2585 return;
2586}
2587
2588module_init(libcxgbi_init_module);
2589module_exit(libcxgbi_exit_module);
1/*
2 * libcxgbi.c: Chelsio common library for T3/T4 iSCSI driver.
3 *
4 * Copyright (c) 2010-2015 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 <net/ipv6.h>
28#include <net/ip6_route.h>
29#include <net/addrconf.h>
30
31#include <linux/inetdevice.h> /* ip_dev_find */
32#include <linux/module.h>
33#include <net/tcp.h>
34
35static unsigned int dbg_level;
36
37#include "libcxgbi.h"
38
39#define DRV_MODULE_NAME "libcxgbi"
40#define DRV_MODULE_DESC "Chelsio iSCSI driver library"
41#define DRV_MODULE_VERSION "0.9.1-ko"
42#define DRV_MODULE_RELDATE "Apr. 2015"
43
44static char version[] =
45 DRV_MODULE_DESC " " DRV_MODULE_NAME
46 " v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
47
48MODULE_AUTHOR("Chelsio Communications, Inc.");
49MODULE_DESCRIPTION(DRV_MODULE_DESC);
50MODULE_VERSION(DRV_MODULE_VERSION);
51MODULE_LICENSE("GPL");
52
53module_param(dbg_level, uint, 0644);
54MODULE_PARM_DESC(dbg_level, "libiscsi debug level (default=0)");
55
56
57/*
58 * cxgbi device management
59 * maintains a list of the cxgbi devices
60 */
61static LIST_HEAD(cdev_list);
62static DEFINE_MUTEX(cdev_mutex);
63
64static LIST_HEAD(cdev_rcu_list);
65static DEFINE_SPINLOCK(cdev_rcu_lock);
66
67static inline void cxgbi_decode_sw_tag(u32 sw_tag, int *idx, int *age)
68{
69 if (age)
70 *age = sw_tag & 0x7FFF;
71 if (idx)
72 *idx = (sw_tag >> 16) & 0x7FFF;
73}
74
75int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
76 unsigned int max_conn)
77{
78 struct cxgbi_ports_map *pmap = &cdev->pmap;
79
80 pmap->port_csk = cxgbi_alloc_big_mem(max_conn *
81 sizeof(struct cxgbi_sock *),
82 GFP_KERNEL);
83 if (!pmap->port_csk) {
84 pr_warn("cdev 0x%p, portmap OOM %u.\n", cdev, max_conn);
85 return -ENOMEM;
86 }
87
88 pmap->max_connect = max_conn;
89 pmap->sport_base = base;
90 spin_lock_init(&pmap->lock);
91 return 0;
92}
93EXPORT_SYMBOL_GPL(cxgbi_device_portmap_create);
94
95void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev)
96{
97 struct cxgbi_ports_map *pmap = &cdev->pmap;
98 struct cxgbi_sock *csk;
99 int i;
100
101 for (i = 0; i < pmap->max_connect; i++) {
102 if (pmap->port_csk[i]) {
103 csk = pmap->port_csk[i];
104 pmap->port_csk[i] = NULL;
105 log_debug(1 << CXGBI_DBG_SOCK,
106 "csk 0x%p, cdev 0x%p, offload down.\n",
107 csk, cdev);
108 spin_lock_bh(&csk->lock);
109 cxgbi_sock_set_flag(csk, CTPF_OFFLOAD_DOWN);
110 cxgbi_sock_closed(csk);
111 spin_unlock_bh(&csk->lock);
112 cxgbi_sock_put(csk);
113 }
114 }
115}
116EXPORT_SYMBOL_GPL(cxgbi_device_portmap_cleanup);
117
118static inline void cxgbi_device_destroy(struct cxgbi_device *cdev)
119{
120 log_debug(1 << CXGBI_DBG_DEV,
121 "cdev 0x%p, p# %u.\n", cdev, cdev->nports);
122 cxgbi_hbas_remove(cdev);
123 cxgbi_device_portmap_cleanup(cdev);
124 if (cdev->cdev2ppm)
125 cxgbi_ppm_release(cdev->cdev2ppm(cdev));
126 if (cdev->pmap.max_connect)
127 cxgbi_free_big_mem(cdev->pmap.port_csk);
128 kfree(cdev);
129}
130
131struct cxgbi_device *cxgbi_device_register(unsigned int extra,
132 unsigned int nports)
133{
134 struct cxgbi_device *cdev;
135
136 cdev = kzalloc(sizeof(*cdev) + extra + nports *
137 (sizeof(struct cxgbi_hba *) +
138 sizeof(struct net_device *)),
139 GFP_KERNEL);
140 if (!cdev) {
141 pr_warn("nport %d, OOM.\n", nports);
142 return NULL;
143 }
144 cdev->ports = (struct net_device **)(cdev + 1);
145 cdev->hbas = (struct cxgbi_hba **)(((char*)cdev->ports) + nports *
146 sizeof(struct net_device *));
147 if (extra)
148 cdev->dd_data = ((char *)cdev->hbas) +
149 nports * sizeof(struct cxgbi_hba *);
150 spin_lock_init(&cdev->pmap.lock);
151
152 mutex_lock(&cdev_mutex);
153 list_add_tail(&cdev->list_head, &cdev_list);
154 mutex_unlock(&cdev_mutex);
155
156 spin_lock(&cdev_rcu_lock);
157 list_add_tail_rcu(&cdev->rcu_node, &cdev_rcu_list);
158 spin_unlock(&cdev_rcu_lock);
159
160 log_debug(1 << CXGBI_DBG_DEV,
161 "cdev 0x%p, p# %u.\n", cdev, nports);
162 return cdev;
163}
164EXPORT_SYMBOL_GPL(cxgbi_device_register);
165
166void cxgbi_device_unregister(struct cxgbi_device *cdev)
167{
168 log_debug(1 << CXGBI_DBG_DEV,
169 "cdev 0x%p, p# %u,%s.\n",
170 cdev, cdev->nports, cdev->nports ? cdev->ports[0]->name : "");
171
172 mutex_lock(&cdev_mutex);
173 list_del(&cdev->list_head);
174 mutex_unlock(&cdev_mutex);
175
176 spin_lock(&cdev_rcu_lock);
177 list_del_rcu(&cdev->rcu_node);
178 spin_unlock(&cdev_rcu_lock);
179 synchronize_rcu();
180
181 cxgbi_device_destroy(cdev);
182}
183EXPORT_SYMBOL_GPL(cxgbi_device_unregister);
184
185void cxgbi_device_unregister_all(unsigned int flag)
186{
187 struct cxgbi_device *cdev, *tmp;
188
189 mutex_lock(&cdev_mutex);
190 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
191 if ((cdev->flags & flag) == flag) {
192 mutex_unlock(&cdev_mutex);
193 cxgbi_device_unregister(cdev);
194 mutex_lock(&cdev_mutex);
195 }
196 }
197 mutex_unlock(&cdev_mutex);
198}
199EXPORT_SYMBOL_GPL(cxgbi_device_unregister_all);
200
201struct cxgbi_device *cxgbi_device_find_by_lldev(void *lldev)
202{
203 struct cxgbi_device *cdev, *tmp;
204
205 mutex_lock(&cdev_mutex);
206 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
207 if (cdev->lldev == lldev) {
208 mutex_unlock(&cdev_mutex);
209 return cdev;
210 }
211 }
212 mutex_unlock(&cdev_mutex);
213
214 log_debug(1 << CXGBI_DBG_DEV,
215 "lldev 0x%p, NO match found.\n", lldev);
216 return NULL;
217}
218EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev);
219
220struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev,
221 int *port)
222{
223 struct net_device *vdev = NULL;
224 struct cxgbi_device *cdev, *tmp;
225 int i;
226
227 if (is_vlan_dev(ndev)) {
228 vdev = ndev;
229 ndev = vlan_dev_real_dev(ndev);
230 log_debug(1 << CXGBI_DBG_DEV,
231 "vlan dev %s -> %s.\n", vdev->name, ndev->name);
232 }
233
234 mutex_lock(&cdev_mutex);
235 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
236 for (i = 0; i < cdev->nports; i++) {
237 if (ndev == cdev->ports[i]) {
238 cdev->hbas[i]->vdev = vdev;
239 mutex_unlock(&cdev_mutex);
240 if (port)
241 *port = i;
242 return cdev;
243 }
244 }
245 }
246 mutex_unlock(&cdev_mutex);
247 log_debug(1 << CXGBI_DBG_DEV,
248 "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
249 return NULL;
250}
251EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev);
252
253struct cxgbi_device *cxgbi_device_find_by_netdev_rcu(struct net_device *ndev,
254 int *port)
255{
256 struct net_device *vdev = NULL;
257 struct cxgbi_device *cdev;
258 int i;
259
260 if (is_vlan_dev(ndev)) {
261 vdev = ndev;
262 ndev = vlan_dev_real_dev(ndev);
263 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
264 }
265
266 rcu_read_lock();
267 list_for_each_entry_rcu(cdev, &cdev_rcu_list, rcu_node) {
268 for (i = 0; i < cdev->nports; i++) {
269 if (ndev == cdev->ports[i]) {
270 cdev->hbas[i]->vdev = vdev;
271 rcu_read_unlock();
272 if (port)
273 *port = i;
274 return cdev;
275 }
276 }
277 }
278 rcu_read_unlock();
279
280 log_debug(1 << CXGBI_DBG_DEV,
281 "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
282 return NULL;
283}
284EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev_rcu);
285
286static struct cxgbi_device *cxgbi_device_find_by_mac(struct net_device *ndev,
287 int *port)
288{
289 struct net_device *vdev = NULL;
290 struct cxgbi_device *cdev, *tmp;
291 int i;
292
293 if (is_vlan_dev(ndev)) {
294 vdev = ndev;
295 ndev = vlan_dev_real_dev(ndev);
296 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
297 }
298
299 mutex_lock(&cdev_mutex);
300 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
301 for (i = 0; i < cdev->nports; i++) {
302 if (!memcmp(ndev->dev_addr, cdev->ports[i]->dev_addr,
303 MAX_ADDR_LEN)) {
304 cdev->hbas[i]->vdev = vdev;
305 mutex_unlock(&cdev_mutex);
306 if (port)
307 *port = i;
308 return cdev;
309 }
310 }
311 }
312 mutex_unlock(&cdev_mutex);
313 log_debug(1 << CXGBI_DBG_DEV,
314 "ndev 0x%p, %s, NO match mac found.\n",
315 ndev, ndev->name);
316 return NULL;
317}
318
319void cxgbi_hbas_remove(struct cxgbi_device *cdev)
320{
321 int i;
322 struct cxgbi_hba *chba;
323
324 log_debug(1 << CXGBI_DBG_DEV,
325 "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
326
327 for (i = 0; i < cdev->nports; i++) {
328 chba = cdev->hbas[i];
329 if (chba) {
330 cdev->hbas[i] = NULL;
331 iscsi_host_remove(chba->shost);
332 pci_dev_put(cdev->pdev);
333 iscsi_host_free(chba->shost);
334 }
335 }
336}
337EXPORT_SYMBOL_GPL(cxgbi_hbas_remove);
338
339int cxgbi_hbas_add(struct cxgbi_device *cdev, u64 max_lun,
340 unsigned int max_id, struct scsi_host_template *sht,
341 struct scsi_transport_template *stt)
342{
343 struct cxgbi_hba *chba;
344 struct Scsi_Host *shost;
345 int i, err;
346
347 log_debug(1 << CXGBI_DBG_DEV, "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
348
349 for (i = 0; i < cdev->nports; i++) {
350 shost = iscsi_host_alloc(sht, sizeof(*chba), 1);
351 if (!shost) {
352 pr_info("0x%p, p%d, %s, host alloc failed.\n",
353 cdev, i, cdev->ports[i]->name);
354 err = -ENOMEM;
355 goto err_out;
356 }
357
358 shost->transportt = stt;
359 shost->max_lun = max_lun;
360 shost->max_id = max_id;
361 shost->max_channel = 0;
362 shost->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
363
364 chba = iscsi_host_priv(shost);
365 chba->cdev = cdev;
366 chba->ndev = cdev->ports[i];
367 chba->shost = shost;
368
369 shost->can_queue = sht->can_queue - ISCSI_MGMT_CMDS_MAX;
370
371 log_debug(1 << CXGBI_DBG_DEV,
372 "cdev 0x%p, p#%d %s: chba 0x%p.\n",
373 cdev, i, cdev->ports[i]->name, chba);
374
375 pci_dev_get(cdev->pdev);
376 err = iscsi_host_add(shost, &cdev->pdev->dev);
377 if (err) {
378 pr_info("cdev 0x%p, p#%d %s, host add failed.\n",
379 cdev, i, cdev->ports[i]->name);
380 pci_dev_put(cdev->pdev);
381 scsi_host_put(shost);
382 goto err_out;
383 }
384
385 cdev->hbas[i] = chba;
386 }
387
388 return 0;
389
390err_out:
391 cxgbi_hbas_remove(cdev);
392 return err;
393}
394EXPORT_SYMBOL_GPL(cxgbi_hbas_add);
395
396/*
397 * iSCSI offload
398 *
399 * - source port management
400 * To find a free source port in the port allocation map we use a very simple
401 * rotor scheme to look for the next free port.
402 *
403 * If a source port has been specified make sure that it doesn't collide with
404 * our normal source port allocation map. If it's outside the range of our
405 * allocation/deallocation scheme just let them use it.
406 *
407 * If the source port is outside our allocation range, the caller is
408 * responsible for keeping track of their port usage.
409 */
410
411static struct cxgbi_sock *find_sock_on_port(struct cxgbi_device *cdev,
412 unsigned char port_id)
413{
414 struct cxgbi_ports_map *pmap = &cdev->pmap;
415 unsigned int i;
416 unsigned int used;
417
418 if (!pmap->max_connect || !pmap->used)
419 return NULL;
420
421 spin_lock_bh(&pmap->lock);
422 used = pmap->used;
423 for (i = 0; used && i < pmap->max_connect; i++) {
424 struct cxgbi_sock *csk = pmap->port_csk[i];
425
426 if (csk) {
427 if (csk->port_id == port_id) {
428 spin_unlock_bh(&pmap->lock);
429 return csk;
430 }
431 used--;
432 }
433 }
434 spin_unlock_bh(&pmap->lock);
435
436 return NULL;
437}
438
439static int sock_get_port(struct cxgbi_sock *csk)
440{
441 struct cxgbi_device *cdev = csk->cdev;
442 struct cxgbi_ports_map *pmap = &cdev->pmap;
443 unsigned int start;
444 int idx;
445 __be16 *port;
446
447 if (!pmap->max_connect) {
448 pr_err("cdev 0x%p, p#%u %s, NO port map.\n",
449 cdev, csk->port_id, cdev->ports[csk->port_id]->name);
450 return -EADDRNOTAVAIL;
451 }
452
453 if (csk->csk_family == AF_INET)
454 port = &csk->saddr.sin_port;
455 else /* ipv6 */
456 port = &csk->saddr6.sin6_port;
457
458 if (*port) {
459 pr_err("source port NON-ZERO %u.\n",
460 ntohs(*port));
461 return -EADDRINUSE;
462 }
463
464 spin_lock_bh(&pmap->lock);
465 if (pmap->used >= pmap->max_connect) {
466 spin_unlock_bh(&pmap->lock);
467 pr_info("cdev 0x%p, p#%u %s, ALL ports used.\n",
468 cdev, csk->port_id, cdev->ports[csk->port_id]->name);
469 return -EADDRNOTAVAIL;
470 }
471
472 start = idx = pmap->next;
473 do {
474 if (++idx >= pmap->max_connect)
475 idx = 0;
476 if (!pmap->port_csk[idx]) {
477 pmap->used++;
478 *port = htons(pmap->sport_base + idx);
479 pmap->next = idx;
480 pmap->port_csk[idx] = csk;
481 spin_unlock_bh(&pmap->lock);
482 cxgbi_sock_get(csk);
483 log_debug(1 << CXGBI_DBG_SOCK,
484 "cdev 0x%p, p#%u %s, p %u, %u.\n",
485 cdev, csk->port_id,
486 cdev->ports[csk->port_id]->name,
487 pmap->sport_base + idx, pmap->next);
488 return 0;
489 }
490 } while (idx != start);
491 spin_unlock_bh(&pmap->lock);
492
493 /* should not happen */
494 pr_warn("cdev 0x%p, p#%u %s, next %u?\n",
495 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
496 pmap->next);
497 return -EADDRNOTAVAIL;
498}
499
500static void sock_put_port(struct cxgbi_sock *csk)
501{
502 struct cxgbi_device *cdev = csk->cdev;
503 struct cxgbi_ports_map *pmap = &cdev->pmap;
504 __be16 *port;
505
506 if (csk->csk_family == AF_INET)
507 port = &csk->saddr.sin_port;
508 else /* ipv6 */
509 port = &csk->saddr6.sin6_port;
510
511 if (*port) {
512 int idx = ntohs(*port) - pmap->sport_base;
513
514 *port = 0;
515 if (idx < 0 || idx >= pmap->max_connect) {
516 pr_err("cdev 0x%p, p#%u %s, port %u OOR.\n",
517 cdev, csk->port_id,
518 cdev->ports[csk->port_id]->name,
519 ntohs(*port));
520 return;
521 }
522
523 spin_lock_bh(&pmap->lock);
524 pmap->port_csk[idx] = NULL;
525 pmap->used--;
526 spin_unlock_bh(&pmap->lock);
527
528 log_debug(1 << CXGBI_DBG_SOCK,
529 "cdev 0x%p, p#%u %s, release %u.\n",
530 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
531 pmap->sport_base + idx);
532
533 cxgbi_sock_put(csk);
534 }
535}
536
537/*
538 * iscsi tcp connection
539 */
540void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *csk)
541{
542 if (csk->cpl_close) {
543 kfree_skb(csk->cpl_close);
544 csk->cpl_close = NULL;
545 }
546 if (csk->cpl_abort_req) {
547 kfree_skb(csk->cpl_abort_req);
548 csk->cpl_abort_req = NULL;
549 }
550 if (csk->cpl_abort_rpl) {
551 kfree_skb(csk->cpl_abort_rpl);
552 csk->cpl_abort_rpl = NULL;
553 }
554}
555EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs);
556
557static struct cxgbi_sock *cxgbi_sock_create(struct cxgbi_device *cdev)
558{
559 struct cxgbi_sock *csk = kzalloc(sizeof(*csk), GFP_NOIO);
560
561 if (!csk) {
562 pr_info("alloc csk %zu failed.\n", sizeof(*csk));
563 return NULL;
564 }
565
566 if (cdev->csk_alloc_cpls(csk) < 0) {
567 pr_info("csk 0x%p, alloc cpls failed.\n", csk);
568 kfree(csk);
569 return NULL;
570 }
571
572 spin_lock_init(&csk->lock);
573 kref_init(&csk->refcnt);
574 skb_queue_head_init(&csk->receive_queue);
575 skb_queue_head_init(&csk->write_queue);
576 timer_setup(&csk->retry_timer, NULL, 0);
577 init_completion(&csk->cmpl);
578 rwlock_init(&csk->callback_lock);
579 csk->cdev = cdev;
580 csk->flags = 0;
581 cxgbi_sock_set_state(csk, CTP_CLOSED);
582
583 log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk);
584
585 return csk;
586}
587
588static struct rtable *find_route_ipv4(struct flowi4 *fl4,
589 __be32 saddr, __be32 daddr,
590 __be16 sport, __be16 dport, u8 tos,
591 int ifindex)
592{
593 struct rtable *rt;
594
595 rt = ip_route_output_ports(&init_net, fl4, NULL, daddr, saddr,
596 dport, sport, IPPROTO_TCP, tos, ifindex);
597 if (IS_ERR(rt))
598 return NULL;
599
600 return rt;
601}
602
603static struct cxgbi_sock *
604cxgbi_check_route(struct sockaddr *dst_addr, int ifindex)
605{
606 struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
607 struct dst_entry *dst;
608 struct net_device *ndev;
609 struct cxgbi_device *cdev;
610 struct rtable *rt = NULL;
611 struct neighbour *n;
612 struct flowi4 fl4;
613 struct cxgbi_sock *csk = NULL;
614 unsigned int mtu = 0;
615 int port = 0xFFFF;
616 int err = 0;
617
618 rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0,
619 daddr->sin_port, 0, ifindex);
620 if (!rt) {
621 pr_info("no route to ipv4 0x%x, port %u.\n",
622 be32_to_cpu(daddr->sin_addr.s_addr),
623 be16_to_cpu(daddr->sin_port));
624 err = -ENETUNREACH;
625 goto err_out;
626 }
627 dst = &rt->dst;
628 n = dst_neigh_lookup(dst, &daddr->sin_addr.s_addr);
629 if (!n) {
630 err = -ENODEV;
631 goto rel_rt;
632 }
633 ndev = n->dev;
634
635 if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
636 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
637 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
638 ndev->name);
639 err = -ENETUNREACH;
640 goto rel_neigh;
641 }
642
643 if (ndev->flags & IFF_LOOPBACK) {
644 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
645 if (!ndev) {
646 err = -ENETUNREACH;
647 goto rel_neigh;
648 }
649 mtu = ndev->mtu;
650 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
651 n->dev->name, ndev->name, mtu);
652 }
653
654 if (!(ndev->flags & IFF_UP) || !netif_carrier_ok(ndev)) {
655 pr_info("%s interface not up.\n", ndev->name);
656 err = -ENETDOWN;
657 goto rel_neigh;
658 }
659
660 cdev = cxgbi_device_find_by_netdev(ndev, &port);
661 if (!cdev)
662 cdev = cxgbi_device_find_by_mac(ndev, &port);
663 if (!cdev) {
664 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
665 &daddr->sin_addr.s_addr, ndev->name);
666 err = -ENETUNREACH;
667 goto rel_neigh;
668 }
669 log_debug(1 << CXGBI_DBG_SOCK,
670 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
671 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
672 port, ndev->name, cdev);
673
674 csk = cxgbi_sock_create(cdev);
675 if (!csk) {
676 err = -ENOMEM;
677 goto rel_neigh;
678 }
679 csk->cdev = cdev;
680 csk->port_id = port;
681 csk->mtu = mtu;
682 csk->dst = dst;
683
684 csk->csk_family = AF_INET;
685 csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
686 csk->daddr.sin_port = daddr->sin_port;
687 csk->daddr.sin_family = daddr->sin_family;
688 csk->saddr.sin_family = daddr->sin_family;
689 csk->saddr.sin_addr.s_addr = fl4.saddr;
690 neigh_release(n);
691
692 return csk;
693
694rel_neigh:
695 neigh_release(n);
696
697rel_rt:
698 ip_rt_put(rt);
699err_out:
700 return ERR_PTR(err);
701}
702
703#if IS_ENABLED(CONFIG_IPV6)
704static struct rt6_info *find_route_ipv6(const struct in6_addr *saddr,
705 const struct in6_addr *daddr,
706 int ifindex)
707{
708 struct flowi6 fl;
709
710 memset(&fl, 0, sizeof(fl));
711 fl.flowi6_oif = ifindex;
712 if (saddr)
713 memcpy(&fl.saddr, saddr, sizeof(struct in6_addr));
714 if (daddr)
715 memcpy(&fl.daddr, daddr, sizeof(struct in6_addr));
716 return (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl);
717}
718
719static struct cxgbi_sock *
720cxgbi_check_route6(struct sockaddr *dst_addr, int ifindex)
721{
722 struct sockaddr_in6 *daddr6 = (struct sockaddr_in6 *)dst_addr;
723 struct dst_entry *dst;
724 struct net_device *ndev;
725 struct cxgbi_device *cdev;
726 struct rt6_info *rt = NULL;
727 struct neighbour *n;
728 struct in6_addr pref_saddr;
729 struct cxgbi_sock *csk = NULL;
730 unsigned int mtu = 0;
731 int port = 0xFFFF;
732 int err = 0;
733
734 rt = find_route_ipv6(NULL, &daddr6->sin6_addr, ifindex);
735
736 if (!rt) {
737 pr_info("no route to ipv6 %pI6 port %u\n",
738 daddr6->sin6_addr.s6_addr,
739 be16_to_cpu(daddr6->sin6_port));
740 err = -ENETUNREACH;
741 goto err_out;
742 }
743
744 dst = &rt->dst;
745
746 n = dst_neigh_lookup(dst, &daddr6->sin6_addr);
747
748 if (!n) {
749 pr_info("%pI6, port %u, dst no neighbour.\n",
750 daddr6->sin6_addr.s6_addr,
751 be16_to_cpu(daddr6->sin6_port));
752 err = -ENETUNREACH;
753 goto rel_rt;
754 }
755 ndev = n->dev;
756
757 if (!(ndev->flags & IFF_UP) || !netif_carrier_ok(ndev)) {
758 pr_info("%s interface not up.\n", ndev->name);
759 err = -ENETDOWN;
760 goto rel_rt;
761 }
762
763 if (ipv6_addr_is_multicast(&daddr6->sin6_addr)) {
764 pr_info("multi-cast route %pI6 port %u, dev %s.\n",
765 daddr6->sin6_addr.s6_addr,
766 ntohs(daddr6->sin6_port), ndev->name);
767 err = -ENETUNREACH;
768 goto rel_rt;
769 }
770
771 cdev = cxgbi_device_find_by_netdev(ndev, &port);
772 if (!cdev)
773 cdev = cxgbi_device_find_by_mac(ndev, &port);
774 if (!cdev) {
775 pr_info("dst %pI6 %s, NOT cxgbi device.\n",
776 daddr6->sin6_addr.s6_addr, ndev->name);
777 err = -ENETUNREACH;
778 goto rel_rt;
779 }
780 log_debug(1 << CXGBI_DBG_SOCK,
781 "route to %pI6 :%u, ndev p#%d,%s, cdev 0x%p.\n",
782 daddr6->sin6_addr.s6_addr, ntohs(daddr6->sin6_port), port,
783 ndev->name, cdev);
784
785 csk = cxgbi_sock_create(cdev);
786 if (!csk) {
787 err = -ENOMEM;
788 goto rel_rt;
789 }
790 csk->cdev = cdev;
791 csk->port_id = port;
792 csk->mtu = mtu;
793 csk->dst = dst;
794
795 rt6_get_prefsrc(rt, &pref_saddr);
796 if (ipv6_addr_any(&pref_saddr)) {
797 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry *)rt);
798
799 err = ipv6_dev_get_saddr(&init_net, idev ? idev->dev : NULL,
800 &daddr6->sin6_addr, 0, &pref_saddr);
801 if (err) {
802 pr_info("failed to get source address to reach %pI6\n",
803 &daddr6->sin6_addr);
804 goto rel_rt;
805 }
806 }
807
808 csk->csk_family = AF_INET6;
809 csk->daddr6.sin6_addr = daddr6->sin6_addr;
810 csk->daddr6.sin6_port = daddr6->sin6_port;
811 csk->daddr6.sin6_family = daddr6->sin6_family;
812 csk->saddr6.sin6_family = daddr6->sin6_family;
813 csk->saddr6.sin6_addr = pref_saddr;
814
815 neigh_release(n);
816 return csk;
817
818rel_rt:
819 if (n)
820 neigh_release(n);
821
822 ip6_rt_put(rt);
823 if (csk)
824 cxgbi_sock_closed(csk);
825err_out:
826 return ERR_PTR(err);
827}
828#endif /* IS_ENABLED(CONFIG_IPV6) */
829
830void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
831 unsigned int opt)
832{
833 csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
834 dst_confirm(csk->dst);
835 smp_mb();
836 cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
837}
838EXPORT_SYMBOL_GPL(cxgbi_sock_established);
839
840static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
841{
842 log_debug(1 << CXGBI_DBG_SOCK,
843 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
844 csk, csk->state, csk->flags, csk->user_data);
845
846 if (csk->state != CTP_ESTABLISHED) {
847 read_lock_bh(&csk->callback_lock);
848 if (csk->user_data)
849 iscsi_conn_failure(csk->user_data,
850 ISCSI_ERR_TCP_CONN_CLOSE);
851 read_unlock_bh(&csk->callback_lock);
852 }
853}
854
855void cxgbi_sock_closed(struct cxgbi_sock *csk)
856{
857 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
858 csk, (csk)->state, (csk)->flags, (csk)->tid);
859 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
860 if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
861 return;
862 if (csk->saddr.sin_port)
863 sock_put_port(csk);
864 if (csk->dst)
865 dst_release(csk->dst);
866 csk->cdev->csk_release_offload_resources(csk);
867 cxgbi_sock_set_state(csk, CTP_CLOSED);
868 cxgbi_inform_iscsi_conn_closing(csk);
869 cxgbi_sock_put(csk);
870}
871EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
872
873static void need_active_close(struct cxgbi_sock *csk)
874{
875 int data_lost;
876 int close_req = 0;
877
878 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
879 csk, (csk)->state, (csk)->flags, (csk)->tid);
880 spin_lock_bh(&csk->lock);
881 if (csk->dst)
882 dst_confirm(csk->dst);
883 data_lost = skb_queue_len(&csk->receive_queue);
884 __skb_queue_purge(&csk->receive_queue);
885
886 if (csk->state == CTP_ACTIVE_OPEN)
887 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
888 else if (csk->state == CTP_ESTABLISHED) {
889 close_req = 1;
890 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
891 } else if (csk->state == CTP_PASSIVE_CLOSE) {
892 close_req = 1;
893 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
894 }
895
896 if (close_req) {
897 if (!cxgbi_sock_flag(csk, CTPF_LOGOUT_RSP_RCVD) ||
898 data_lost)
899 csk->cdev->csk_send_abort_req(csk);
900 else
901 csk->cdev->csk_send_close_req(csk);
902 }
903
904 spin_unlock_bh(&csk->lock);
905}
906
907void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
908{
909 pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
910 csk, csk->state, csk->flags,
911 &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
912 &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
913 errno);
914
915 cxgbi_sock_set_state(csk, CTP_CONNECTING);
916 csk->err = errno;
917 cxgbi_sock_closed(csk);
918}
919EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
920
921void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
922{
923 struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
924 struct module *owner = csk->cdev->owner;
925
926 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
927 csk, (csk)->state, (csk)->flags, (csk)->tid);
928 cxgbi_sock_get(csk);
929 spin_lock_bh(&csk->lock);
930 if (csk->state == CTP_ACTIVE_OPEN)
931 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
932 spin_unlock_bh(&csk->lock);
933 cxgbi_sock_put(csk);
934 __kfree_skb(skb);
935
936 module_put(owner);
937}
938EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
939
940void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
941{
942 cxgbi_sock_get(csk);
943 spin_lock_bh(&csk->lock);
944
945 cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
946 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
947 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
948 if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
949 pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
950 csk, csk->state, csk->flags, csk->tid);
951 cxgbi_sock_closed(csk);
952 }
953
954 spin_unlock_bh(&csk->lock);
955 cxgbi_sock_put(csk);
956}
957EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
958
959void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
960{
961 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
962 csk, (csk)->state, (csk)->flags, (csk)->tid);
963 cxgbi_sock_get(csk);
964 spin_lock_bh(&csk->lock);
965
966 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
967 goto done;
968
969 switch (csk->state) {
970 case CTP_ESTABLISHED:
971 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
972 break;
973 case CTP_ACTIVE_CLOSE:
974 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
975 break;
976 case CTP_CLOSE_WAIT_1:
977 cxgbi_sock_closed(csk);
978 break;
979 case CTP_ABORTING:
980 break;
981 default:
982 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
983 csk, csk->state, csk->flags, csk->tid);
984 }
985 cxgbi_inform_iscsi_conn_closing(csk);
986done:
987 spin_unlock_bh(&csk->lock);
988 cxgbi_sock_put(csk);
989}
990EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
991
992void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
993{
994 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
995 csk, (csk)->state, (csk)->flags, (csk)->tid);
996 cxgbi_sock_get(csk);
997 spin_lock_bh(&csk->lock);
998
999 csk->snd_una = snd_nxt - 1;
1000 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
1001 goto done;
1002
1003 switch (csk->state) {
1004 case CTP_ACTIVE_CLOSE:
1005 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
1006 break;
1007 case CTP_CLOSE_WAIT_1:
1008 case CTP_CLOSE_WAIT_2:
1009 cxgbi_sock_closed(csk);
1010 break;
1011 case CTP_ABORTING:
1012 break;
1013 default:
1014 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
1015 csk, csk->state, csk->flags, csk->tid);
1016 }
1017done:
1018 spin_unlock_bh(&csk->lock);
1019 cxgbi_sock_put(csk);
1020}
1021EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
1022
1023void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
1024 unsigned int snd_una, int seq_chk)
1025{
1026 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1027 "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
1028 csk, csk->state, csk->flags, csk->tid, credits,
1029 csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
1030
1031 spin_lock_bh(&csk->lock);
1032
1033 csk->wr_cred += credits;
1034 if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
1035 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
1036
1037 while (credits) {
1038 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
1039
1040 if (unlikely(!p)) {
1041 pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
1042 csk, csk->state, csk->flags, csk->tid, credits,
1043 csk->wr_cred, csk->wr_una_cred);
1044 break;
1045 }
1046
1047 if (unlikely(credits < p->csum)) {
1048 pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
1049 csk, csk->state, csk->flags, csk->tid,
1050 credits, csk->wr_cred, csk->wr_una_cred,
1051 p->csum);
1052 p->csum -= credits;
1053 break;
1054 } else {
1055 cxgbi_sock_dequeue_wr(csk);
1056 credits -= p->csum;
1057 kfree_skb(p);
1058 }
1059 }
1060
1061 cxgbi_sock_check_wr_invariants(csk);
1062
1063 if (seq_chk) {
1064 if (unlikely(before(snd_una, csk->snd_una))) {
1065 pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
1066 csk, csk->state, csk->flags, csk->tid, snd_una,
1067 csk->snd_una);
1068 goto done;
1069 }
1070
1071 if (csk->snd_una != snd_una) {
1072 csk->snd_una = snd_una;
1073 dst_confirm(csk->dst);
1074 }
1075 }
1076
1077 if (skb_queue_len(&csk->write_queue)) {
1078 if (csk->cdev->csk_push_tx_frames(csk, 0))
1079 cxgbi_conn_tx_open(csk);
1080 } else
1081 cxgbi_conn_tx_open(csk);
1082done:
1083 spin_unlock_bh(&csk->lock);
1084}
1085EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
1086
1087static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
1088 unsigned short mtu)
1089{
1090 int i = 0;
1091
1092 while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
1093 ++i;
1094
1095 return i;
1096}
1097
1098unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
1099{
1100 unsigned int idx;
1101 struct dst_entry *dst = csk->dst;
1102
1103 csk->advmss = dst_metric_advmss(dst);
1104
1105 if (csk->advmss > pmtu - 40)
1106 csk->advmss = pmtu - 40;
1107 if (csk->advmss < csk->cdev->mtus[0] - 40)
1108 csk->advmss = csk->cdev->mtus[0] - 40;
1109 idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
1110
1111 return idx;
1112}
1113EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
1114
1115void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
1116{
1117 cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
1118 __skb_queue_tail(&csk->write_queue, skb);
1119}
1120EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
1121
1122void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
1123{
1124 struct sk_buff *skb;
1125
1126 while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
1127 kfree_skb(skb);
1128}
1129EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
1130
1131void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
1132{
1133 int pending = cxgbi_sock_count_pending_wrs(csk);
1134
1135 if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
1136 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
1137 csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
1138}
1139EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
1140
1141static inline void
1142scmd_get_params(struct scsi_cmnd *sc, struct scatterlist **sgl,
1143 unsigned int *sgcnt, unsigned int *dlen,
1144 unsigned int prot)
1145{
1146 struct scsi_data_buffer *sdb = prot ? scsi_prot(sc) : &sc->sdb;
1147
1148 *sgl = sdb->table.sgl;
1149 *sgcnt = sdb->table.nents;
1150 *dlen = sdb->length;
1151 /* Caution: for protection sdb, sdb->length is invalid */
1152}
1153
1154void cxgbi_ddp_set_one_ppod(struct cxgbi_pagepod *ppod,
1155 struct cxgbi_task_tag_info *ttinfo,
1156 struct scatterlist **sg_pp, unsigned int *sg_off)
1157{
1158 struct scatterlist *sg = sg_pp ? *sg_pp : NULL;
1159 unsigned int offset = sg_off ? *sg_off : 0;
1160 dma_addr_t addr = 0UL;
1161 unsigned int len = 0;
1162 int i;
1163
1164 memcpy(ppod, &ttinfo->hdr, sizeof(struct cxgbi_pagepod_hdr));
1165
1166 if (sg) {
1167 addr = sg_dma_address(sg);
1168 len = sg_dma_len(sg);
1169 }
1170
1171 for (i = 0; i < PPOD_PAGES_MAX; i++) {
1172 if (sg) {
1173 ppod->addr[i] = cpu_to_be64(addr + offset);
1174 offset += PAGE_SIZE;
1175 if (offset == (len + sg->offset)) {
1176 offset = 0;
1177 sg = sg_next(sg);
1178 if (sg) {
1179 addr = sg_dma_address(sg);
1180 len = sg_dma_len(sg);
1181 }
1182 }
1183 } else {
1184 ppod->addr[i] = 0ULL;
1185 }
1186 }
1187
1188 /*
1189 * the fifth address needs to be repeated in the next ppod, so do
1190 * not move sg
1191 */
1192 if (sg_pp) {
1193 *sg_pp = sg;
1194 *sg_off = offset;
1195 }
1196
1197 if (offset == len) {
1198 offset = 0;
1199 sg = sg_next(sg);
1200 if (sg) {
1201 addr = sg_dma_address(sg);
1202 len = sg_dma_len(sg);
1203 }
1204 }
1205 ppod->addr[i] = sg ? cpu_to_be64(addr + offset) : 0ULL;
1206}
1207EXPORT_SYMBOL_GPL(cxgbi_ddp_set_one_ppod);
1208
1209/*
1210 * APIs interacting with open-iscsi libraries
1211 */
1212
1213int cxgbi_ddp_ppm_setup(void **ppm_pp, struct cxgbi_device *cdev,
1214 struct cxgbi_tag_format *tformat,
1215 unsigned int iscsi_size, unsigned int llimit,
1216 unsigned int start, unsigned int rsvd_factor,
1217 unsigned int edram_start, unsigned int edram_size)
1218{
1219 int err = cxgbi_ppm_init(ppm_pp, cdev->ports[0], cdev->pdev,
1220 cdev->lldev, tformat, iscsi_size, llimit, start,
1221 rsvd_factor, edram_start, edram_size);
1222
1223 if (err >= 0) {
1224 struct cxgbi_ppm *ppm = (struct cxgbi_ppm *)(*ppm_pp);
1225
1226 if (ppm->ppmax < 1024 ||
1227 ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX)
1228 cdev->flags |= CXGBI_FLAG_DDP_OFF;
1229 err = 0;
1230 } else {
1231 cdev->flags |= CXGBI_FLAG_DDP_OFF;
1232 }
1233
1234 return err;
1235}
1236EXPORT_SYMBOL_GPL(cxgbi_ddp_ppm_setup);
1237
1238static int cxgbi_ddp_sgl_check(struct scatterlist *sgl, int nents)
1239{
1240 int i;
1241 int last_sgidx = nents - 1;
1242 struct scatterlist *sg = sgl;
1243
1244 for (i = 0; i < nents; i++, sg = sg_next(sg)) {
1245 unsigned int len = sg->length + sg->offset;
1246
1247 if ((sg->offset & 0x3) || (i && sg->offset) ||
1248 ((i != last_sgidx) && len != PAGE_SIZE)) {
1249 log_debug(1 << CXGBI_DBG_DDP,
1250 "sg %u/%u, %u,%u, not aligned.\n",
1251 i, nents, sg->offset, sg->length);
1252 goto err_out;
1253 }
1254 }
1255 return 0;
1256err_out:
1257 return -EINVAL;
1258}
1259
1260static int cxgbi_ddp_reserve(struct cxgbi_conn *cconn,
1261 struct cxgbi_task_data *tdata, u32 sw_tag,
1262 unsigned int xferlen)
1263{
1264 struct cxgbi_sock *csk = cconn->cep->csk;
1265 struct cxgbi_device *cdev = csk->cdev;
1266 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1267 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1268 struct scatterlist *sgl = ttinfo->sgl;
1269 unsigned int sgcnt = ttinfo->nents;
1270 unsigned int sg_offset = sgl->offset;
1271 int err;
1272
1273 if (cdev->flags & CXGBI_FLAG_DDP_OFF) {
1274 log_debug(1 << CXGBI_DBG_DDP,
1275 "cdev 0x%p DDP off.\n", cdev);
1276 return -EINVAL;
1277 }
1278
1279 if (!ppm || xferlen < DDP_THRESHOLD || !sgcnt ||
1280 ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX) {
1281 log_debug(1 << CXGBI_DBG_DDP,
1282 "ppm 0x%p, pgidx %u, xfer %u, sgcnt %u, NO ddp.\n",
1283 ppm, ppm ? ppm->tformat.pgsz_idx_dflt : DDP_PGIDX_MAX,
1284 xferlen, ttinfo->nents);
1285 return -EINVAL;
1286 }
1287
1288 /* make sure the buffer is suitable for ddp */
1289 if (cxgbi_ddp_sgl_check(sgl, sgcnt) < 0)
1290 return -EINVAL;
1291
1292 ttinfo->nr_pages = (xferlen + sgl->offset + (1 << PAGE_SHIFT) - 1) >>
1293 PAGE_SHIFT;
1294
1295 /*
1296 * the ddp tag will be used for the itt in the outgoing pdu,
1297 * the itt genrated by libiscsi is saved in the ppm and can be
1298 * retrieved via the ddp tag
1299 */
1300 err = cxgbi_ppm_ppods_reserve(ppm, ttinfo->nr_pages, 0, &ttinfo->idx,
1301 &ttinfo->tag, (unsigned long)sw_tag);
1302 if (err < 0) {
1303 cconn->ddp_full++;
1304 return err;
1305 }
1306 ttinfo->npods = err;
1307
1308 /* setup dma from scsi command sgl */
1309 sgl->offset = 0;
1310 err = dma_map_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1311 sgl->offset = sg_offset;
1312 if (err == 0) {
1313 pr_info("%s: 0x%x, xfer %u, sgl %u dma mapping err.\n",
1314 __func__, sw_tag, xferlen, sgcnt);
1315 goto rel_ppods;
1316 }
1317 if (err != ttinfo->nr_pages) {
1318 log_debug(1 << CXGBI_DBG_DDP,
1319 "%s: sw tag 0x%x, xfer %u, sgl %u, dma count %d.\n",
1320 __func__, sw_tag, xferlen, sgcnt, err);
1321 }
1322
1323 ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_MAPPED;
1324 ttinfo->cid = csk->port_id;
1325
1326 cxgbi_ppm_make_ppod_hdr(ppm, ttinfo->tag, csk->tid, sgl->offset,
1327 xferlen, &ttinfo->hdr);
1328
1329 if (cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ) {
1330 /* write ppod from xmit_pdu (of iscsi_scsi_command pdu) */
1331 ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_VALID;
1332 } else {
1333 /* write ppod from control queue now */
1334 err = cdev->csk_ddp_set_map(ppm, csk, ttinfo);
1335 if (err < 0)
1336 goto rel_ppods;
1337 }
1338
1339 return 0;
1340
1341rel_ppods:
1342 cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1343
1344 if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_MAPPED) {
1345 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_MAPPED;
1346 dma_unmap_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1347 }
1348 return -EINVAL;
1349}
1350
1351static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1352{
1353 struct scsi_cmnd *sc = task->sc;
1354 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1355 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1356 struct cxgbi_device *cdev = cconn->chba->cdev;
1357 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1358 u32 tag = ntohl((__force u32)hdr_itt);
1359
1360 log_debug(1 << CXGBI_DBG_DDP,
1361 "cdev 0x%p, task 0x%p, release tag 0x%x.\n",
1362 cdev, task, tag);
1363 if (sc && sc->sc_data_direction == DMA_FROM_DEVICE &&
1364 cxgbi_ppm_is_ddp_tag(ppm, tag)) {
1365 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1366 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1367
1368 if (!(cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ))
1369 cdev->csk_ddp_clear_map(cdev, ppm, ttinfo);
1370 cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1371 dma_unmap_sg(&ppm->pdev->dev, ttinfo->sgl, ttinfo->nents,
1372 DMA_FROM_DEVICE);
1373 }
1374}
1375
1376static inline u32 cxgbi_build_sw_tag(u32 idx, u32 age)
1377{
1378 /* assume idx and age both are < 0x7FFF (32767) */
1379 return (idx << 16) | age;
1380}
1381
1382static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1383{
1384 struct scsi_cmnd *sc = task->sc;
1385 struct iscsi_conn *conn = task->conn;
1386 struct iscsi_session *sess = conn->session;
1387 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1388 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1389 struct cxgbi_device *cdev = cconn->chba->cdev;
1390 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1391 u32 sw_tag = cxgbi_build_sw_tag(task->itt, sess->age);
1392 u32 tag = 0;
1393 int err = -EINVAL;
1394
1395 if (sc && sc->sc_data_direction == DMA_FROM_DEVICE) {
1396 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1397 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1398
1399 scmd_get_params(sc, &ttinfo->sgl, &ttinfo->nents,
1400 &tdata->dlen, 0);
1401 err = cxgbi_ddp_reserve(cconn, tdata, sw_tag, tdata->dlen);
1402 if (!err)
1403 tag = ttinfo->tag;
1404 else
1405 log_debug(1 << CXGBI_DBG_DDP,
1406 "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1407 cconn->cep->csk, task, tdata->dlen,
1408 ttinfo->nents);
1409 }
1410
1411 if (err < 0) {
1412 err = cxgbi_ppm_make_non_ddp_tag(ppm, sw_tag, &tag);
1413 if (err < 0)
1414 return err;
1415 }
1416 /* the itt need to sent in big-endian order */
1417 *hdr_itt = (__force itt_t)htonl(tag);
1418
1419 log_debug(1 << CXGBI_DBG_DDP,
1420 "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1421 cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1422 return 0;
1423}
1424
1425void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1426{
1427 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1428 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1429 struct cxgbi_device *cdev = cconn->chba->cdev;
1430 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1431 u32 tag = ntohl((__force u32)itt);
1432 u32 sw_bits;
1433
1434 if (ppm) {
1435 if (cxgbi_ppm_is_ddp_tag(ppm, tag))
1436 sw_bits = cxgbi_ppm_get_tag_caller_data(ppm, tag);
1437 else
1438 sw_bits = cxgbi_ppm_decode_non_ddp_tag(ppm, tag);
1439 } else {
1440 sw_bits = tag;
1441 }
1442
1443 cxgbi_decode_sw_tag(sw_bits, idx, age);
1444 log_debug(1 << CXGBI_DBG_DDP,
1445 "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1446 cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1447 age ? *age : 0xFF);
1448}
1449EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1450
1451void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1452{
1453 struct iscsi_conn *conn = csk->user_data;
1454
1455 if (conn) {
1456 log_debug(1 << CXGBI_DBG_SOCK,
1457 "csk 0x%p, cid %d.\n", csk, conn->id);
1458 iscsi_conn_queue_work(conn);
1459 }
1460}
1461EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1462
1463/*
1464 * pdu receive, interact with libiscsi_tcp
1465 */
1466static inline int read_pdu_skb(struct iscsi_conn *conn,
1467 struct sk_buff *skb,
1468 unsigned int offset,
1469 int offloaded)
1470{
1471 int status = 0;
1472 int bytes_read;
1473
1474 bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1475 switch (status) {
1476 case ISCSI_TCP_CONN_ERR:
1477 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1478 skb, offset, offloaded);
1479 return -EIO;
1480 case ISCSI_TCP_SUSPENDED:
1481 log_debug(1 << CXGBI_DBG_PDU_RX,
1482 "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1483 skb, offset, offloaded, bytes_read);
1484 /* no transfer - just have caller flush queue */
1485 return bytes_read;
1486 case ISCSI_TCP_SKB_DONE:
1487 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1488 skb, offset, offloaded);
1489 /*
1490 * pdus should always fit in the skb and we should get
1491 * segment done notifcation.
1492 */
1493 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1494 return -EFAULT;
1495 case ISCSI_TCP_SEGMENT_DONE:
1496 log_debug(1 << CXGBI_DBG_PDU_RX,
1497 "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1498 skb, offset, offloaded, bytes_read);
1499 return bytes_read;
1500 default:
1501 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1502 skb, offset, offloaded, status);
1503 return -EINVAL;
1504 }
1505}
1506
1507static int
1508skb_read_pdu_bhs(struct cxgbi_sock *csk, struct iscsi_conn *conn,
1509 struct sk_buff *skb)
1510{
1511 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1512 int err;
1513
1514 log_debug(1 << CXGBI_DBG_PDU_RX,
1515 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1516 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1517
1518 if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1519 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1520 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1521 return -EIO;
1522 }
1523
1524 if (conn->hdrdgst_en &&
1525 cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1526 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1527 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1528 return -EIO;
1529 }
1530
1531 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_ISCSI_COMPL) &&
1532 cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA_DDPD)) {
1533 /* If completion flag is set and data is directly
1534 * placed in to the host memory then update
1535 * task->exp_datasn to the datasn in completion
1536 * iSCSI hdr as T6 adapter generates completion only
1537 * for the last pdu of a sequence.
1538 */
1539 itt_t itt = ((struct iscsi_data *)skb->data)->itt;
1540 struct iscsi_task *task = iscsi_itt_to_ctask(conn, itt);
1541 u32 data_sn = be32_to_cpu(((struct iscsi_data *)
1542 skb->data)->datasn);
1543 if (task && task->sc) {
1544 struct iscsi_tcp_task *tcp_task = task->dd_data;
1545
1546 tcp_task->exp_datasn = data_sn;
1547 }
1548 }
1549
1550 err = read_pdu_skb(conn, skb, 0, 0);
1551 if (likely(err >= 0)) {
1552 struct iscsi_hdr *hdr = (struct iscsi_hdr *)skb->data;
1553 u8 opcode = hdr->opcode & ISCSI_OPCODE_MASK;
1554
1555 if (unlikely(opcode == ISCSI_OP_LOGOUT_RSP))
1556 cxgbi_sock_set_flag(csk, CTPF_LOGOUT_RSP_RCVD);
1557 }
1558
1559 return err;
1560}
1561
1562static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1563 struct sk_buff *skb, unsigned int offset)
1564{
1565 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1566 bool offloaded = 0;
1567 int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1568
1569 log_debug(1 << CXGBI_DBG_PDU_RX,
1570 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1571 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1572
1573 if (conn->datadgst_en &&
1574 cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1575 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1576 conn, lskb, cxgbi_skcb_flags(lskb));
1577 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1578 return -EIO;
1579 }
1580
1581 if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1582 return 0;
1583
1584 /* coalesced, add header digest length */
1585 if (lskb == skb && conn->hdrdgst_en)
1586 offset += ISCSI_DIGEST_SIZE;
1587
1588 if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1589 offloaded = 1;
1590
1591 if (opcode == ISCSI_OP_SCSI_DATA_IN)
1592 log_debug(1 << CXGBI_DBG_PDU_RX,
1593 "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1594 skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1595 tcp_conn->in.datalen, offloaded ? "is" : "not");
1596
1597 return read_pdu_skb(conn, skb, offset, offloaded);
1598}
1599
1600static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1601{
1602 struct cxgbi_device *cdev = csk->cdev;
1603 int must_send;
1604 u32 credits;
1605
1606 log_debug(1 << CXGBI_DBG_PDU_RX,
1607 "csk 0x%p,%u,0x%lx,%u, seq %u, wup %u, thre %u, %u.\n",
1608 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1609 csk->rcv_wup, cdev->rx_credit_thres,
1610 csk->rcv_win);
1611
1612 if (!cdev->rx_credit_thres)
1613 return;
1614
1615 if (csk->state != CTP_ESTABLISHED)
1616 return;
1617
1618 credits = csk->copied_seq - csk->rcv_wup;
1619 if (unlikely(!credits))
1620 return;
1621 must_send = credits + 16384 >= csk->rcv_win;
1622 if (must_send || credits >= cdev->rx_credit_thres)
1623 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1624}
1625
1626void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1627{
1628 struct cxgbi_device *cdev = csk->cdev;
1629 struct iscsi_conn *conn = csk->user_data;
1630 struct sk_buff *skb;
1631 unsigned int read = 0;
1632 int err = 0;
1633
1634 log_debug(1 << CXGBI_DBG_PDU_RX,
1635 "csk 0x%p, conn 0x%p.\n", csk, conn);
1636
1637 if (unlikely(!conn || conn->suspend_rx)) {
1638 log_debug(1 << CXGBI_DBG_PDU_RX,
1639 "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1640 csk, conn, conn ? conn->id : 0xFF,
1641 conn ? conn->suspend_rx : 0xFF);
1642 return;
1643 }
1644
1645 while (!err) {
1646 skb = skb_peek(&csk->receive_queue);
1647 if (!skb ||
1648 !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1649 if (skb)
1650 log_debug(1 << CXGBI_DBG_PDU_RX,
1651 "skb 0x%p, NOT ready 0x%lx.\n",
1652 skb, cxgbi_skcb_flags(skb));
1653 break;
1654 }
1655 __skb_unlink(skb, &csk->receive_queue);
1656
1657 read += cxgbi_skcb_rx_pdulen(skb);
1658 log_debug(1 << CXGBI_DBG_PDU_RX,
1659 "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1660 csk, skb, skb->len, cxgbi_skcb_flags(skb),
1661 cxgbi_skcb_rx_pdulen(skb));
1662
1663 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1664 err = skb_read_pdu_bhs(csk, conn, skb);
1665 if (err < 0) {
1666 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1667 "f 0x%lx, plen %u.\n",
1668 csk, skb, skb->len,
1669 cxgbi_skcb_flags(skb),
1670 cxgbi_skcb_rx_pdulen(skb));
1671 goto skb_done;
1672 }
1673 err = skb_read_pdu_data(conn, skb, skb,
1674 err + cdev->skb_rx_extra);
1675 if (err < 0)
1676 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1677 "f 0x%lx, plen %u.\n",
1678 csk, skb, skb->len,
1679 cxgbi_skcb_flags(skb),
1680 cxgbi_skcb_rx_pdulen(skb));
1681 } else {
1682 err = skb_read_pdu_bhs(csk, conn, skb);
1683 if (err < 0) {
1684 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1685 "f 0x%lx, plen %u.\n",
1686 csk, skb, skb->len,
1687 cxgbi_skcb_flags(skb),
1688 cxgbi_skcb_rx_pdulen(skb));
1689 goto skb_done;
1690 }
1691
1692 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1693 struct sk_buff *dskb;
1694
1695 dskb = skb_peek(&csk->receive_queue);
1696 if (!dskb) {
1697 pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1698 " plen %u, NO data.\n",
1699 csk, skb, skb->len,
1700 cxgbi_skcb_flags(skb),
1701 cxgbi_skcb_rx_pdulen(skb));
1702 err = -EIO;
1703 goto skb_done;
1704 }
1705 __skb_unlink(dskb, &csk->receive_queue);
1706
1707 err = skb_read_pdu_data(conn, skb, dskb, 0);
1708 if (err < 0)
1709 pr_err("data, csk 0x%p, skb 0x%p,%u, "
1710 "f 0x%lx, plen %u, dskb 0x%p,"
1711 "%u.\n",
1712 csk, skb, skb->len,
1713 cxgbi_skcb_flags(skb),
1714 cxgbi_skcb_rx_pdulen(skb),
1715 dskb, dskb->len);
1716 __kfree_skb(dskb);
1717 } else
1718 err = skb_read_pdu_data(conn, skb, skb, 0);
1719 }
1720skb_done:
1721 __kfree_skb(skb);
1722
1723 if (err < 0)
1724 break;
1725 }
1726
1727 log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
1728 if (read) {
1729 csk->copied_seq += read;
1730 csk_return_rx_credits(csk, read);
1731 conn->rxdata_octets += read;
1732 }
1733
1734 if (err < 0) {
1735 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
1736 csk, conn, err, read);
1737 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1738 }
1739}
1740EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
1741
1742static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
1743 unsigned int offset, unsigned int *off,
1744 struct scatterlist **sgp)
1745{
1746 int i;
1747 struct scatterlist *sg;
1748
1749 for_each_sg(sgl, sg, sgcnt, i) {
1750 if (offset < sg->length) {
1751 *off = offset;
1752 *sgp = sg;
1753 return 0;
1754 }
1755 offset -= sg->length;
1756 }
1757 return -EFAULT;
1758}
1759
1760static int
1761sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
1762 unsigned int dlen, struct page_frag *frags,
1763 int frag_max, u32 *dlimit)
1764{
1765 unsigned int datalen = dlen;
1766 unsigned int sglen = sg->length - sgoffset;
1767 struct page *page = sg_page(sg);
1768 int i;
1769
1770 i = 0;
1771 do {
1772 unsigned int copy;
1773
1774 if (!sglen) {
1775 sg = sg_next(sg);
1776 if (!sg) {
1777 pr_warn("sg %d NULL, len %u/%u.\n",
1778 i, datalen, dlen);
1779 return -EINVAL;
1780 }
1781 sgoffset = 0;
1782 sglen = sg->length;
1783 page = sg_page(sg);
1784
1785 }
1786 copy = min(datalen, sglen);
1787 if (i && page == frags[i - 1].page &&
1788 sgoffset + sg->offset ==
1789 frags[i - 1].offset + frags[i - 1].size) {
1790 frags[i - 1].size += copy;
1791 } else {
1792 if (i >= frag_max) {
1793 pr_warn("too many pages %u, dlen %u.\n",
1794 frag_max, dlen);
1795 *dlimit = dlen - datalen;
1796 return -EINVAL;
1797 }
1798
1799 frags[i].page = page;
1800 frags[i].offset = sg->offset + sgoffset;
1801 frags[i].size = copy;
1802 i++;
1803 }
1804 datalen -= copy;
1805 sgoffset += copy;
1806 sglen -= copy;
1807 } while (datalen);
1808
1809 return i;
1810}
1811
1812static void cxgbi_task_data_sgl_check(struct iscsi_task *task)
1813{
1814 struct scsi_cmnd *sc = task->sc;
1815 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1816 struct scatterlist *sg, *sgl = NULL;
1817 u32 sgcnt = 0;
1818 int i;
1819
1820 tdata->flags = CXGBI_TASK_SGL_CHECKED;
1821 if (!sc)
1822 return;
1823
1824 scmd_get_params(sc, &sgl, &sgcnt, &tdata->dlen, 0);
1825 if (!sgl || !sgcnt) {
1826 tdata->flags |= CXGBI_TASK_SGL_COPY;
1827 return;
1828 }
1829
1830 for_each_sg(sgl, sg, sgcnt, i) {
1831 if (page_count(sg_page(sg)) < 1) {
1832 tdata->flags |= CXGBI_TASK_SGL_COPY;
1833 return;
1834 }
1835 }
1836}
1837
1838static int
1839cxgbi_task_data_sgl_read(struct iscsi_task *task, u32 offset, u32 count,
1840 u32 *dlimit)
1841{
1842 struct scsi_cmnd *sc = task->sc;
1843 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1844 struct scatterlist *sgl = NULL;
1845 struct scatterlist *sg;
1846 u32 dlen = 0;
1847 u32 sgcnt;
1848 int err;
1849
1850 if (!sc)
1851 return 0;
1852
1853 scmd_get_params(sc, &sgl, &sgcnt, &dlen, 0);
1854 if (!sgl || !sgcnt)
1855 return 0;
1856
1857 err = sgl_seek_offset(sgl, sgcnt, offset, &tdata->sgoffset, &sg);
1858 if (err < 0) {
1859 pr_warn("tpdu max, sgl %u, bad offset %u/%u.\n",
1860 sgcnt, offset, tdata->dlen);
1861 return err;
1862 }
1863 err = sgl_read_to_frags(sg, tdata->sgoffset, count,
1864 tdata->frags, MAX_SKB_FRAGS, dlimit);
1865 if (err < 0) {
1866 log_debug(1 << CXGBI_DBG_ISCSI,
1867 "sgl max limit, sgl %u, offset %u, %u/%u, dlimit %u.\n",
1868 sgcnt, offset, count, tdata->dlen, *dlimit);
1869 return err;
1870 }
1871 tdata->offset = offset;
1872 tdata->count = count;
1873 tdata->nr_frags = err;
1874 tdata->total_count = count;
1875 tdata->total_offset = offset;
1876
1877 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1878 "%s: offset %u, count %u,\n"
1879 "err %u, total_count %u, total_offset %u\n",
1880 __func__, offset, count, err, tdata->total_count, tdata->total_offset);
1881
1882 return 0;
1883}
1884
1885int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 op)
1886{
1887 struct iscsi_conn *conn = task->conn;
1888 struct iscsi_session *session = task->conn->session;
1889 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1890 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1891 struct cxgbi_device *cdev = cconn->chba->cdev;
1892 struct cxgbi_sock *csk = cconn->cep ? cconn->cep->csk : NULL;
1893 struct iscsi_tcp_task *tcp_task = task->dd_data;
1894 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1895 struct scsi_cmnd *sc = task->sc;
1896 u32 headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
1897 u32 max_txdata_len = conn->max_xmit_dlength;
1898 u32 iso_tx_rsvd = 0, local_iso_info = 0;
1899 u32 last_tdata_offset, last_tdata_count;
1900 int err = 0;
1901
1902 if (!tcp_task) {
1903 pr_err("task 0x%p, tcp_task 0x%p, tdata 0x%p.\n",
1904 task, tcp_task, tdata);
1905 return -ENOMEM;
1906 }
1907 if (!csk) {
1908 pr_err("task 0x%p, csk gone.\n", task);
1909 return -EPIPE;
1910 }
1911
1912 op &= ISCSI_OPCODE_MASK;
1913
1914 tcp_task->dd_data = tdata;
1915 task->hdr = NULL;
1916
1917 last_tdata_count = tdata->count;
1918 last_tdata_offset = tdata->offset;
1919
1920 if ((op == ISCSI_OP_SCSI_DATA_OUT) ||
1921 ((op == ISCSI_OP_SCSI_CMD) &&
1922 (sc->sc_data_direction == DMA_TO_DEVICE))) {
1923 u32 remaining_data_tosend, dlimit = 0;
1924 u32 max_pdu_size, max_num_pdu, num_pdu;
1925 u32 count;
1926
1927 /* Preserve conn->max_xmit_dlength because it can get updated to
1928 * ISO data size.
1929 */
1930 if (task->state == ISCSI_TASK_PENDING)
1931 tdata->max_xmit_dlength = conn->max_xmit_dlength;
1932
1933 if (!tdata->offset)
1934 cxgbi_task_data_sgl_check(task);
1935
1936 remaining_data_tosend =
1937 tdata->dlen - tdata->offset - tdata->count;
1938
1939recalculate_sgl:
1940 max_txdata_len = tdata->max_xmit_dlength;
1941 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1942 "tdata->dlen %u, remaining to send %u "
1943 "conn->max_xmit_dlength %u, "
1944 "tdata->max_xmit_dlength %u\n",
1945 tdata->dlen, remaining_data_tosend,
1946 conn->max_xmit_dlength, tdata->max_xmit_dlength);
1947
1948 if (cdev->skb_iso_txhdr && !csk->disable_iso &&
1949 (remaining_data_tosend > tdata->max_xmit_dlength) &&
1950 !(remaining_data_tosend % 4)) {
1951 u32 max_iso_data;
1952
1953 if ((op == ISCSI_OP_SCSI_CMD) &&
1954 session->initial_r2t_en)
1955 goto no_iso;
1956
1957 max_pdu_size = tdata->max_xmit_dlength +
1958 ISCSI_PDU_NONPAYLOAD_LEN;
1959 max_iso_data = rounddown(CXGBI_MAX_ISO_DATA_IN_SKB,
1960 csk->advmss);
1961 max_num_pdu = max_iso_data / max_pdu_size;
1962
1963 num_pdu = (remaining_data_tosend +
1964 tdata->max_xmit_dlength - 1) /
1965 tdata->max_xmit_dlength;
1966
1967 if (num_pdu > max_num_pdu)
1968 num_pdu = max_num_pdu;
1969
1970 conn->max_xmit_dlength = tdata->max_xmit_dlength * num_pdu;
1971 max_txdata_len = conn->max_xmit_dlength;
1972 iso_tx_rsvd = cdev->skb_iso_txhdr;
1973 local_iso_info = sizeof(struct cxgbi_iso_info);
1974
1975 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1976 "max_pdu_size %u, max_num_pdu %u, "
1977 "max_txdata %u, num_pdu %u\n",
1978 max_pdu_size, max_num_pdu,
1979 max_txdata_len, num_pdu);
1980 }
1981no_iso:
1982 count = min_t(u32, max_txdata_len, remaining_data_tosend);
1983 err = cxgbi_task_data_sgl_read(task,
1984 tdata->offset + tdata->count,
1985 count, &dlimit);
1986 if (unlikely(err < 0)) {
1987 log_debug(1 << CXGBI_DBG_ISCSI,
1988 "task 0x%p, tcp_task 0x%p, tdata 0x%p, "
1989 "sgl err %d, count %u, dlimit %u\n",
1990 task, tcp_task, tdata, err, count, dlimit);
1991 if (dlimit) {
1992 remaining_data_tosend =
1993 rounddown(dlimit,
1994 tdata->max_xmit_dlength);
1995 if (!remaining_data_tosend)
1996 remaining_data_tosend = dlimit;
1997
1998 dlimit = 0;
1999
2000 conn->max_xmit_dlength = remaining_data_tosend;
2001 goto recalculate_sgl;
2002 }
2003
2004 pr_err("task 0x%p, tcp_task 0x%p, tdata 0x%p, "
2005 "sgl err %d\n",
2006 task, tcp_task, tdata, err);
2007 goto ret_err;
2008 }
2009
2010 if ((tdata->flags & CXGBI_TASK_SGL_COPY) ||
2011 (tdata->nr_frags > MAX_SKB_FRAGS))
2012 headroom += conn->max_xmit_dlength;
2013 }
2014
2015 tdata->skb = alloc_skb(local_iso_info + cdev->skb_tx_rsvd +
2016 iso_tx_rsvd + headroom, GFP_ATOMIC);
2017 if (!tdata->skb) {
2018 tdata->count = last_tdata_count;
2019 tdata->offset = last_tdata_offset;
2020 err = -ENOMEM;
2021 goto ret_err;
2022 }
2023
2024 skb_reserve(tdata->skb, local_iso_info + cdev->skb_tx_rsvd +
2025 iso_tx_rsvd);
2026
2027 if (task->sc) {
2028 task->hdr = (struct iscsi_hdr *)tdata->skb->data;
2029 } else {
2030 task->hdr = kzalloc(SKB_TX_ISCSI_PDU_HEADER_MAX, GFP_ATOMIC);
2031 if (!task->hdr) {
2032 __kfree_skb(tdata->skb);
2033 tdata->skb = NULL;
2034 return -ENOMEM;
2035 }
2036 }
2037
2038 task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX;
2039
2040 if (iso_tx_rsvd)
2041 cxgbi_skcb_set_flag(tdata->skb, SKCBF_TX_ISO);
2042
2043 /* data_out uses scsi_cmd's itt */
2044 if (op != ISCSI_OP_SCSI_DATA_OUT)
2045 task_reserve_itt(task, &task->hdr->itt);
2046
2047 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2048 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
2049 task, op, tdata->skb, cdev->skb_tx_rsvd, headroom,
2050 conn->max_xmit_dlength, be32_to_cpu(task->hdr->itt));
2051
2052 return 0;
2053
2054ret_err:
2055 conn->max_xmit_dlength = tdata->max_xmit_dlength;
2056 return err;
2057}
2058EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
2059
2060static int
2061cxgbi_prep_iso_info(struct iscsi_task *task, struct sk_buff *skb,
2062 u32 count)
2063{
2064 struct cxgbi_iso_info *iso_info = (struct cxgbi_iso_info *)skb->head;
2065 struct iscsi_r2t_info *r2t;
2066 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2067 struct iscsi_conn *conn = task->conn;
2068 struct iscsi_session *session = conn->session;
2069 struct iscsi_tcp_task *tcp_task = task->dd_data;
2070 u32 burst_size = 0, r2t_dlength = 0, dlength;
2071 u32 max_pdu_len = tdata->max_xmit_dlength;
2072 u32 segment_offset = 0;
2073 u32 num_pdu;
2074
2075 if (unlikely(!cxgbi_skcb_test_flag(skb, SKCBF_TX_ISO)))
2076 return 0;
2077
2078 memset(iso_info, 0, sizeof(struct cxgbi_iso_info));
2079
2080 if (task->hdr->opcode == ISCSI_OP_SCSI_CMD && session->imm_data_en) {
2081 iso_info->flags |= CXGBI_ISO_INFO_IMM_ENABLE;
2082 burst_size = count;
2083 }
2084
2085 dlength = ntoh24(task->hdr->dlength);
2086 dlength = min(dlength, max_pdu_len);
2087 hton24(task->hdr->dlength, dlength);
2088
2089 num_pdu = (count + max_pdu_len - 1) / max_pdu_len;
2090
2091 if (iscsi_task_has_unsol_data(task))
2092 r2t = &task->unsol_r2t;
2093 else
2094 r2t = tcp_task->r2t;
2095
2096 if (r2t) {
2097 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2098 "count %u, tdata->count %u, num_pdu %u,"
2099 "task->hdr_len %u, r2t->data_length %u, r2t->sent %u\n",
2100 count, tdata->count, num_pdu, task->hdr_len,
2101 r2t->data_length, r2t->sent);
2102
2103 r2t_dlength = r2t->data_length - r2t->sent;
2104 segment_offset = r2t->sent;
2105 r2t->datasn += num_pdu - 1;
2106 }
2107
2108 if (!r2t || !r2t->sent)
2109 iso_info->flags |= CXGBI_ISO_INFO_FSLICE;
2110
2111 if (task->hdr->flags & ISCSI_FLAG_CMD_FINAL)
2112 iso_info->flags |= CXGBI_ISO_INFO_LSLICE;
2113
2114 task->hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2115
2116 iso_info->op = task->hdr->opcode;
2117 iso_info->ahs = task->hdr->hlength;
2118 iso_info->num_pdu = num_pdu;
2119 iso_info->mpdu = max_pdu_len;
2120 iso_info->burst_size = (burst_size + r2t_dlength) >> 2;
2121 iso_info->len = count + task->hdr_len;
2122 iso_info->segment_offset = segment_offset;
2123
2124 cxgbi_skcb_tx_iscsi_hdrlen(skb) = task->hdr_len;
2125 return 0;
2126}
2127
2128static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
2129{
2130 if (hcrc || dcrc) {
2131 u8 submode = 0;
2132
2133 if (hcrc)
2134 submode |= 1;
2135 if (dcrc)
2136 submode |= 2;
2137 cxgbi_skcb_tx_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
2138 } else
2139 cxgbi_skcb_tx_ulp_mode(skb) = 0;
2140}
2141
2142static struct page *rsvd_page;
2143
2144int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
2145 unsigned int count)
2146{
2147 struct iscsi_conn *conn = task->conn;
2148 struct iscsi_tcp_task *tcp_task = task->dd_data;
2149 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2150 struct sk_buff *skb;
2151 struct scsi_cmnd *sc = task->sc;
2152 u32 expected_count, expected_offset;
2153 u32 datalen = count, dlimit = 0;
2154 u32 i, padlen = iscsi_padding(count);
2155 struct page *pg;
2156 int err;
2157
2158 if (!tcp_task || (tcp_task->dd_data != tdata)) {
2159 pr_err("task 0x%p,0x%p, tcp_task 0x%p, tdata 0x%p/0x%p.\n",
2160 task, task->sc, tcp_task,
2161 tcp_task ? tcp_task->dd_data : NULL, tdata);
2162 return -EINVAL;
2163 }
2164 skb = tdata->skb;
2165
2166 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2167 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
2168 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
2169 be32_to_cpu(task->cmdsn), be32_to_cpu(task->hdr->itt), offset, count);
2170
2171 skb_put(skb, task->hdr_len);
2172 tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
2173 if (!count) {
2174 tdata->count = count;
2175 tdata->offset = offset;
2176 tdata->nr_frags = 0;
2177 tdata->total_offset = 0;
2178 tdata->total_count = 0;
2179 if (tdata->max_xmit_dlength)
2180 conn->max_xmit_dlength = tdata->max_xmit_dlength;
2181 cxgbi_skcb_clear_flag(skb, SKCBF_TX_ISO);
2182 return 0;
2183 }
2184
2185 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2186 "data->total_count %u, tdata->total_offset %u\n",
2187 tdata->total_count, tdata->total_offset);
2188
2189 expected_count = tdata->total_count;
2190 expected_offset = tdata->total_offset;
2191
2192 if ((count != expected_count) ||
2193 (offset != expected_offset)) {
2194 err = cxgbi_task_data_sgl_read(task, offset, count, &dlimit);
2195 if (err < 0) {
2196 pr_err("task 0x%p,0x%p, tcp_task 0x%p, tdata 0x%p/0x%p "
2197 "dlimit %u, sgl err %d.\n", task, task->sc,
2198 tcp_task, tcp_task ? tcp_task->dd_data : NULL,
2199 tdata, dlimit, err);
2200 return err;
2201 }
2202 }
2203
2204 /* Restore original value of conn->max_xmit_dlength because
2205 * it can get updated to ISO data size.
2206 */
2207 conn->max_xmit_dlength = tdata->max_xmit_dlength;
2208
2209 if (sc) {
2210 struct page_frag *frag = tdata->frags;
2211
2212 if ((tdata->flags & CXGBI_TASK_SGL_COPY) ||
2213 (tdata->nr_frags > MAX_SKB_FRAGS) ||
2214 (padlen && (tdata->nr_frags ==
2215 MAX_SKB_FRAGS))) {
2216 char *dst = skb->data + task->hdr_len;
2217
2218 /* data fits in the skb's headroom */
2219 for (i = 0; i < tdata->nr_frags; i++, frag++) {
2220 char *src = kmap_atomic(frag->page);
2221
2222 memcpy(dst, src + frag->offset, frag->size);
2223 dst += frag->size;
2224 kunmap_atomic(src);
2225 }
2226
2227 if (padlen) {
2228 memset(dst, 0, padlen);
2229 padlen = 0;
2230 }
2231 skb_put(skb, count + padlen);
2232 } else {
2233 for (i = 0; i < tdata->nr_frags; i++, frag++) {
2234 get_page(frag->page);
2235 skb_fill_page_desc(skb, i, frag->page,
2236 frag->offset, frag->size);
2237 }
2238
2239 skb->len += count;
2240 skb->data_len += count;
2241 skb->truesize += count;
2242 }
2243 } else {
2244 pg = virt_to_head_page(task->data);
2245 get_page(pg);
2246 skb_fill_page_desc(skb, 0, pg,
2247 task->data - (char *)page_address(pg),
2248 count);
2249 skb->len += count;
2250 skb->data_len += count;
2251 skb->truesize += count;
2252 }
2253
2254 if (padlen) {
2255 get_page(rsvd_page);
2256 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
2257 rsvd_page, 0, padlen);
2258
2259 skb->data_len += padlen;
2260 skb->truesize += padlen;
2261 skb->len += padlen;
2262 }
2263
2264 if (likely(count > tdata->max_xmit_dlength))
2265 cxgbi_prep_iso_info(task, skb, count);
2266 else
2267 cxgbi_skcb_clear_flag(skb, SKCBF_TX_ISO);
2268
2269 return 0;
2270}
2271EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
2272
2273static int cxgbi_sock_tx_queue_up(struct cxgbi_sock *csk, struct sk_buff *skb)
2274{
2275 struct cxgbi_device *cdev = csk->cdev;
2276 struct cxgbi_iso_info *iso_cpl;
2277 u32 frags = skb_shinfo(skb)->nr_frags;
2278 u32 extra_len, num_pdu, hdr_len;
2279 u32 iso_tx_rsvd = 0;
2280
2281 if (csk->state != CTP_ESTABLISHED) {
2282 log_debug(1 << CXGBI_DBG_PDU_TX,
2283 "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
2284 csk, csk->state, csk->flags, csk->tid);
2285 return -EPIPE;
2286 }
2287
2288 if (csk->err) {
2289 log_debug(1 << CXGBI_DBG_PDU_TX,
2290 "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
2291 csk, csk->state, csk->flags, csk->tid, csk->err);
2292 return -EPIPE;
2293 }
2294
2295 if ((cdev->flags & CXGBI_FLAG_DEV_T3) &&
2296 before((csk->snd_win + csk->snd_una), csk->write_seq)) {
2297 log_debug(1 << CXGBI_DBG_PDU_TX,
2298 "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
2299 csk, csk->state, csk->flags, csk->tid, csk->write_seq,
2300 csk->snd_una, csk->snd_win);
2301 return -ENOBUFS;
2302 }
2303
2304 if (cxgbi_skcb_test_flag(skb, SKCBF_TX_ISO))
2305 iso_tx_rsvd = cdev->skb_iso_txhdr;
2306
2307 if (unlikely(skb_headroom(skb) < (cdev->skb_tx_rsvd + iso_tx_rsvd))) {
2308 pr_err("csk 0x%p, skb head %u < %u.\n",
2309 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
2310 return -EINVAL;
2311 }
2312
2313 if (skb->len != skb->data_len)
2314 frags++;
2315
2316 if (frags >= SKB_WR_LIST_SIZE) {
2317 pr_err("csk 0x%p, frags %u, %u,%u >%lu.\n",
2318 csk, skb_shinfo(skb)->nr_frags, skb->len,
2319 skb->data_len, SKB_WR_LIST_SIZE);
2320 return -EINVAL;
2321 }
2322
2323 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
2324 skb_reset_transport_header(skb);
2325 cxgbi_sock_skb_entail(csk, skb);
2326
2327 extra_len = cxgbi_ulp_extra_len(cxgbi_skcb_tx_ulp_mode(skb));
2328
2329 if (likely(cxgbi_skcb_test_flag(skb, SKCBF_TX_ISO))) {
2330 iso_cpl = (struct cxgbi_iso_info *)skb->head;
2331 num_pdu = iso_cpl->num_pdu;
2332 hdr_len = cxgbi_skcb_tx_iscsi_hdrlen(skb);
2333 extra_len = (cxgbi_ulp_extra_len(cxgbi_skcb_tx_ulp_mode(skb)) *
2334 num_pdu) + (hdr_len * (num_pdu - 1));
2335 }
2336
2337 csk->write_seq += (skb->len + extra_len);
2338
2339 return 0;
2340}
2341
2342static int cxgbi_sock_send_skb(struct cxgbi_sock *csk, struct sk_buff *skb)
2343{
2344 struct cxgbi_device *cdev = csk->cdev;
2345 int len = skb->len;
2346 int err;
2347
2348 spin_lock_bh(&csk->lock);
2349 err = cxgbi_sock_tx_queue_up(csk, skb);
2350 if (err < 0) {
2351 spin_unlock_bh(&csk->lock);
2352 return err;
2353 }
2354
2355 if (likely(skb_queue_len(&csk->write_queue)))
2356 cdev->csk_push_tx_frames(csk, 0);
2357 spin_unlock_bh(&csk->lock);
2358 return len;
2359}
2360
2361int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2362{
2363 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2364 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2365 struct iscsi_tcp_task *tcp_task = task->dd_data;
2366 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2367 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
2368 struct sk_buff *skb;
2369 struct cxgbi_sock *csk = NULL;
2370 u32 pdulen = 0;
2371 u32 datalen;
2372 int err;
2373
2374 if (!tcp_task || (tcp_task->dd_data != tdata)) {
2375 pr_err("task 0x%p,0x%p, tcp_task 0x%p, tdata 0x%p/0x%p.\n",
2376 task, task->sc, tcp_task,
2377 tcp_task ? tcp_task->dd_data : NULL, tdata);
2378 return -EINVAL;
2379 }
2380
2381 skb = tdata->skb;
2382 if (!skb) {
2383 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2384 "task 0x%p, skb NULL.\n", task);
2385 return 0;
2386 }
2387
2388 if (cconn && cconn->cep)
2389 csk = cconn->cep->csk;
2390
2391 if (!csk) {
2392 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2393 "task 0x%p, csk gone.\n", task);
2394 return -EPIPE;
2395 }
2396
2397 tdata->skb = NULL;
2398 datalen = skb->data_len;
2399
2400 /* write ppod first if using ofldq to write ppod */
2401 if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_VALID) {
2402 struct cxgbi_ppm *ppm = csk->cdev->cdev2ppm(csk->cdev);
2403
2404 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_VALID;
2405 if (csk->cdev->csk_ddp_set_map(ppm, csk, ttinfo) < 0)
2406 pr_err("task 0x%p, ppod writing using ofldq failed.\n",
2407 task);
2408 /* continue. Let fl get the data */
2409 }
2410
2411 if (!task->sc)
2412 memcpy(skb->data, task->hdr, SKB_TX_ISCSI_PDU_HEADER_MAX);
2413
2414 err = cxgbi_sock_send_skb(csk, skb);
2415 if (err > 0) {
2416 pdulen += err;
2417
2418 log_debug(1 << CXGBI_DBG_PDU_TX, "task 0x%p,0x%p, rv %d.\n",
2419 task, task->sc, err);
2420
2421 if (task->conn->hdrdgst_en)
2422 pdulen += ISCSI_DIGEST_SIZE;
2423
2424 if (datalen && task->conn->datadgst_en)
2425 pdulen += ISCSI_DIGEST_SIZE;
2426
2427 task->conn->txdata_octets += pdulen;
2428
2429 if (unlikely(cxgbi_is_iso_config(csk) && cxgbi_is_iso_disabled(csk))) {
2430 if (time_after(jiffies, csk->prev_iso_ts + HZ)) {
2431 csk->disable_iso = false;
2432 csk->prev_iso_ts = 0;
2433 log_debug(1 << CXGBI_DBG_PDU_TX,
2434 "enable iso: csk 0x%p\n", csk);
2435 }
2436 }
2437
2438 return 0;
2439 }
2440
2441 if (err == -EAGAIN || err == -ENOBUFS) {
2442 log_debug(1 << CXGBI_DBG_PDU_TX,
2443 "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2444 task, skb, skb->len, skb->data_len, err);
2445 /* reset skb to send when we are called again */
2446 tdata->skb = skb;
2447
2448 if (cxgbi_is_iso_config(csk) && !cxgbi_is_iso_disabled(csk) &&
2449 (csk->no_tx_credits++ >= 2)) {
2450 csk->disable_iso = true;
2451 csk->prev_iso_ts = jiffies;
2452 log_debug(1 << CXGBI_DBG_PDU_TX,
2453 "disable iso:csk 0x%p, ts:%lu\n",
2454 csk, csk->prev_iso_ts);
2455 }
2456
2457 return err;
2458 }
2459
2460 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2461 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2462 task->itt, skb, skb->len, skb->data_len, err);
2463 __kfree_skb(skb);
2464 iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2465 iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2466 return err;
2467}
2468EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2469
2470void cxgbi_cleanup_task(struct iscsi_task *task)
2471{
2472 struct iscsi_tcp_task *tcp_task = task->dd_data;
2473 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2474
2475 if (!tcp_task || (tcp_task->dd_data != tdata)) {
2476 pr_info("task 0x%p,0x%p, tcp_task 0x%p, tdata 0x%p/0x%p.\n",
2477 task, task->sc, tcp_task,
2478 tcp_task ? tcp_task->dd_data : NULL, tdata);
2479 return;
2480 }
2481
2482 log_debug(1 << CXGBI_DBG_ISCSI,
2483 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2484 task, tdata->skb, task->hdr_itt);
2485
2486 tcp_task->dd_data = NULL;
2487
2488 if (!task->sc)
2489 kfree(task->hdr);
2490 task->hdr = NULL;
2491
2492 /* never reached the xmit task callout */
2493 if (tdata->skb) {
2494 __kfree_skb(tdata->skb);
2495 tdata->skb = NULL;
2496 }
2497
2498 task_release_itt(task, task->hdr_itt);
2499 memset(tdata, 0, sizeof(*tdata));
2500
2501 iscsi_tcp_cleanup_task(task);
2502}
2503EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2504
2505void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2506 struct iscsi_stats *stats)
2507{
2508 struct iscsi_conn *conn = cls_conn->dd_data;
2509
2510 stats->txdata_octets = conn->txdata_octets;
2511 stats->rxdata_octets = conn->rxdata_octets;
2512 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2513 stats->dataout_pdus = conn->dataout_pdus_cnt;
2514 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2515 stats->datain_pdus = conn->datain_pdus_cnt;
2516 stats->r2t_pdus = conn->r2t_pdus_cnt;
2517 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2518 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2519 stats->digest_err = 0;
2520 stats->timeout_err = 0;
2521 stats->custom_length = 1;
2522 strcpy(stats->custom[0].desc, "eh_abort_cnt");
2523 stats->custom[0].value = conn->eh_abort_cnt;
2524}
2525EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2526
2527static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2528{
2529 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2530 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2531 struct cxgbi_device *cdev = cconn->chba->cdev;
2532 unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2533 unsigned int max_def = 512 * MAX_SKB_FRAGS;
2534 unsigned int max = max(max_def, headroom);
2535
2536 max = min(cconn->chba->cdev->tx_max_size, max);
2537 if (conn->max_xmit_dlength)
2538 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2539 else
2540 conn->max_xmit_dlength = max;
2541 cxgbi_align_pdu_size(conn->max_xmit_dlength);
2542
2543 return 0;
2544}
2545
2546static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2547{
2548 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2549 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2550 unsigned int max = cconn->chba->cdev->rx_max_size;
2551
2552 cxgbi_align_pdu_size(max);
2553
2554 if (conn->max_recv_dlength) {
2555 if (conn->max_recv_dlength > max) {
2556 pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2557 conn->max_recv_dlength, max);
2558 return -EINVAL;
2559 }
2560 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2561 cxgbi_align_pdu_size(conn->max_recv_dlength);
2562 } else
2563 conn->max_recv_dlength = max;
2564
2565 return 0;
2566}
2567
2568int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2569 enum iscsi_param param, char *buf, int buflen)
2570{
2571 struct iscsi_conn *conn = cls_conn->dd_data;
2572 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2573 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2574 struct cxgbi_sock *csk = cconn->cep->csk;
2575 int err;
2576
2577 log_debug(1 << CXGBI_DBG_ISCSI,
2578 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2579 cls_conn, param, buflen, buf);
2580
2581 switch (param) {
2582 case ISCSI_PARAM_HDRDGST_EN:
2583 err = iscsi_set_param(cls_conn, param, buf, buflen);
2584 if (!err && conn->hdrdgst_en)
2585 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2586 conn->hdrdgst_en,
2587 conn->datadgst_en);
2588 break;
2589 case ISCSI_PARAM_DATADGST_EN:
2590 err = iscsi_set_param(cls_conn, param, buf, buflen);
2591 if (!err && conn->datadgst_en)
2592 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2593 conn->hdrdgst_en,
2594 conn->datadgst_en);
2595 break;
2596 case ISCSI_PARAM_MAX_R2T:
2597 return iscsi_tcp_set_max_r2t(conn, buf);
2598 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2599 err = iscsi_set_param(cls_conn, param, buf, buflen);
2600 if (!err)
2601 err = cxgbi_conn_max_recv_dlength(conn);
2602 break;
2603 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2604 err = iscsi_set_param(cls_conn, param, buf, buflen);
2605 if (!err)
2606 err = cxgbi_conn_max_xmit_dlength(conn);
2607 break;
2608 default:
2609 return iscsi_set_param(cls_conn, param, buf, buflen);
2610 }
2611 return err;
2612}
2613EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2614
2615int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2616 char *buf)
2617{
2618 struct cxgbi_endpoint *cep = ep->dd_data;
2619 struct cxgbi_sock *csk;
2620
2621 log_debug(1 << CXGBI_DBG_ISCSI,
2622 "cls_conn 0x%p, param %d.\n", ep, param);
2623
2624 switch (param) {
2625 case ISCSI_PARAM_CONN_PORT:
2626 case ISCSI_PARAM_CONN_ADDRESS:
2627 if (!cep)
2628 return -ENOTCONN;
2629
2630 csk = cep->csk;
2631 if (!csk)
2632 return -ENOTCONN;
2633
2634 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2635 &csk->daddr, param, buf);
2636 default:
2637 break;
2638 }
2639 return -ENOSYS;
2640}
2641EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
2642
2643struct iscsi_cls_conn *
2644cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2645{
2646 struct iscsi_cls_conn *cls_conn;
2647 struct iscsi_conn *conn;
2648 struct iscsi_tcp_conn *tcp_conn;
2649 struct cxgbi_conn *cconn;
2650
2651 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2652 if (!cls_conn)
2653 return NULL;
2654
2655 conn = cls_conn->dd_data;
2656 tcp_conn = conn->dd_data;
2657 cconn = tcp_conn->dd_data;
2658 cconn->iconn = conn;
2659
2660 log_debug(1 << CXGBI_DBG_ISCSI,
2661 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2662 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2663
2664 return cls_conn;
2665}
2666EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2667
2668int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2669 struct iscsi_cls_conn *cls_conn,
2670 u64 transport_eph, int is_leading)
2671{
2672 struct iscsi_conn *conn = cls_conn->dd_data;
2673 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2674 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2675 struct cxgbi_ppm *ppm;
2676 struct iscsi_endpoint *ep;
2677 struct cxgbi_endpoint *cep;
2678 struct cxgbi_sock *csk;
2679 int err;
2680
2681 ep = iscsi_lookup_endpoint(transport_eph);
2682 if (!ep)
2683 return -EINVAL;
2684
2685 /* setup ddp pagesize */
2686 cep = ep->dd_data;
2687 csk = cep->csk;
2688
2689 ppm = csk->cdev->cdev2ppm(csk->cdev);
2690 err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid,
2691 ppm->tformat.pgsz_idx_dflt);
2692 if (err < 0)
2693 return err;
2694
2695 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2696 if (err)
2697 return -EINVAL;
2698
2699 /* calculate the tag idx bits needed for this conn based on cmds_max */
2700 cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2701
2702 write_lock_bh(&csk->callback_lock);
2703 csk->user_data = conn;
2704 cconn->chba = cep->chba;
2705 cconn->cep = cep;
2706 cep->cconn = cconn;
2707 write_unlock_bh(&csk->callback_lock);
2708
2709 cxgbi_conn_max_xmit_dlength(conn);
2710 cxgbi_conn_max_recv_dlength(conn);
2711
2712 log_debug(1 << CXGBI_DBG_ISCSI,
2713 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2714 cls_session, cls_conn, ep, cconn, csk);
2715 /* init recv engine */
2716 iscsi_tcp_hdr_recv_prep(tcp_conn);
2717
2718 return 0;
2719}
2720EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2721
2722struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2723 u16 cmds_max, u16 qdepth,
2724 u32 initial_cmdsn)
2725{
2726 struct cxgbi_endpoint *cep;
2727 struct cxgbi_hba *chba;
2728 struct Scsi_Host *shost;
2729 struct iscsi_cls_session *cls_session;
2730 struct iscsi_session *session;
2731
2732 if (!ep) {
2733 pr_err("missing endpoint.\n");
2734 return NULL;
2735 }
2736
2737 cep = ep->dd_data;
2738 chba = cep->chba;
2739 shost = chba->shost;
2740
2741 BUG_ON(chba != iscsi_host_priv(shost));
2742
2743 cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2744 cmds_max, 0,
2745 sizeof(struct iscsi_tcp_task) +
2746 sizeof(struct cxgbi_task_data),
2747 initial_cmdsn, ISCSI_MAX_TARGET);
2748 if (!cls_session)
2749 return NULL;
2750
2751 session = cls_session->dd_data;
2752 if (iscsi_tcp_r2tpool_alloc(session))
2753 goto remove_session;
2754
2755 log_debug(1 << CXGBI_DBG_ISCSI,
2756 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2757 return cls_session;
2758
2759remove_session:
2760 iscsi_session_teardown(cls_session);
2761 return NULL;
2762}
2763EXPORT_SYMBOL_GPL(cxgbi_create_session);
2764
2765void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2766{
2767 log_debug(1 << CXGBI_DBG_ISCSI,
2768 "cls sess 0x%p.\n", cls_session);
2769
2770 iscsi_tcp_r2tpool_free(cls_session->dd_data);
2771 iscsi_session_teardown(cls_session);
2772}
2773EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2774
2775int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2776 char *buf, int buflen)
2777{
2778 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2779
2780 if (!chba->ndev) {
2781 shost_printk(KERN_ERR, shost, "Could not get host param. "
2782 "netdev for host not set.\n");
2783 return -ENODEV;
2784 }
2785
2786 log_debug(1 << CXGBI_DBG_ISCSI,
2787 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2788 shost, chba, chba->ndev->name, param, buflen, buf);
2789
2790 switch (param) {
2791 case ISCSI_HOST_PARAM_IPADDRESS:
2792 {
2793 __be32 addr = in_aton(buf);
2794 log_debug(1 << CXGBI_DBG_ISCSI,
2795 "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2796 cxgbi_set_iscsi_ipv4(chba, addr);
2797 return 0;
2798 }
2799 case ISCSI_HOST_PARAM_HWADDRESS:
2800 case ISCSI_HOST_PARAM_NETDEV_NAME:
2801 return 0;
2802 default:
2803 return iscsi_host_set_param(shost, param, buf, buflen);
2804 }
2805}
2806EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2807
2808int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2809 char *buf)
2810{
2811 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2812 int len = 0;
2813
2814 if (!chba->ndev) {
2815 shost_printk(KERN_ERR, shost, "Could not get host param. "
2816 "netdev for host not set.\n");
2817 return -ENODEV;
2818 }
2819
2820 log_debug(1 << CXGBI_DBG_ISCSI,
2821 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2822 shost, chba, chba->ndev->name, param);
2823
2824 switch (param) {
2825 case ISCSI_HOST_PARAM_HWADDRESS:
2826 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2827 break;
2828 case ISCSI_HOST_PARAM_NETDEV_NAME:
2829 len = sprintf(buf, "%s\n", chba->ndev->name);
2830 break;
2831 case ISCSI_HOST_PARAM_IPADDRESS:
2832 {
2833 struct cxgbi_sock *csk = find_sock_on_port(chba->cdev,
2834 chba->port_id);
2835 if (csk) {
2836 len = sprintf(buf, "%pIS",
2837 (struct sockaddr *)&csk->saddr);
2838 }
2839 log_debug(1 << CXGBI_DBG_ISCSI,
2840 "hba %s, addr %s.\n", chba->ndev->name, buf);
2841 break;
2842 }
2843 default:
2844 return iscsi_host_get_param(shost, param, buf);
2845 }
2846
2847 return len;
2848}
2849EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2850
2851struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2852 struct sockaddr *dst_addr,
2853 int non_blocking)
2854{
2855 struct iscsi_endpoint *ep;
2856 struct cxgbi_endpoint *cep;
2857 struct cxgbi_hba *hba = NULL;
2858 struct cxgbi_sock *csk;
2859 int ifindex = 0;
2860 int err = -EINVAL;
2861
2862 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2863 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2864 shost, non_blocking, dst_addr);
2865
2866 if (shost) {
2867 hba = iscsi_host_priv(shost);
2868 if (!hba) {
2869 pr_info("shost 0x%p, priv NULL.\n", shost);
2870 goto err_out;
2871 }
2872 }
2873
2874check_route:
2875 if (dst_addr->sa_family == AF_INET) {
2876 csk = cxgbi_check_route(dst_addr, ifindex);
2877#if IS_ENABLED(CONFIG_IPV6)
2878 } else if (dst_addr->sa_family == AF_INET6) {
2879 csk = cxgbi_check_route6(dst_addr, ifindex);
2880#endif
2881 } else {
2882 pr_info("address family 0x%x NOT supported.\n",
2883 dst_addr->sa_family);
2884 err = -EAFNOSUPPORT;
2885 return (struct iscsi_endpoint *)ERR_PTR(err);
2886 }
2887
2888 if (IS_ERR(csk))
2889 return (struct iscsi_endpoint *)csk;
2890 cxgbi_sock_get(csk);
2891
2892 if (!hba)
2893 hba = csk->cdev->hbas[csk->port_id];
2894 else if (hba != csk->cdev->hbas[csk->port_id]) {
2895 if (ifindex != hba->ndev->ifindex) {
2896 cxgbi_sock_put(csk);
2897 cxgbi_sock_closed(csk);
2898 ifindex = hba->ndev->ifindex;
2899 goto check_route;
2900 }
2901
2902 pr_info("Could not connect through requested host %u"
2903 "hba 0x%p != 0x%p (%u).\n",
2904 shost->host_no, hba,
2905 csk->cdev->hbas[csk->port_id], csk->port_id);
2906 err = -ENOSPC;
2907 goto release_conn;
2908 }
2909
2910 err = sock_get_port(csk);
2911 if (err)
2912 goto release_conn;
2913
2914 cxgbi_sock_set_state(csk, CTP_CONNECTING);
2915 err = csk->cdev->csk_init_act_open(csk);
2916 if (err)
2917 goto release_conn;
2918
2919 if (cxgbi_sock_is_closing(csk)) {
2920 err = -ENOSPC;
2921 pr_info("csk 0x%p is closing.\n", csk);
2922 goto release_conn;
2923 }
2924
2925 ep = iscsi_create_endpoint(sizeof(*cep));
2926 if (!ep) {
2927 err = -ENOMEM;
2928 pr_info("iscsi alloc ep, OOM.\n");
2929 goto release_conn;
2930 }
2931
2932 cep = ep->dd_data;
2933 cep->csk = csk;
2934 cep->chba = hba;
2935
2936 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2937 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2938 ep, cep, csk, hba, hba->ndev->name);
2939 return ep;
2940
2941release_conn:
2942 cxgbi_sock_put(csk);
2943 cxgbi_sock_closed(csk);
2944err_out:
2945 return ERR_PTR(err);
2946}
2947EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2948
2949int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2950{
2951 struct cxgbi_endpoint *cep = ep->dd_data;
2952 struct cxgbi_sock *csk = cep->csk;
2953
2954 if (!cxgbi_sock_is_established(csk))
2955 return 0;
2956 return 1;
2957}
2958EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2959
2960void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2961{
2962 struct cxgbi_endpoint *cep = ep->dd_data;
2963 struct cxgbi_conn *cconn = cep->cconn;
2964 struct cxgbi_sock *csk = cep->csk;
2965
2966 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2967 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2968 ep, cep, cconn, csk, csk->state, csk->flags);
2969
2970 if (cconn && cconn->iconn) {
2971 iscsi_suspend_tx(cconn->iconn);
2972 write_lock_bh(&csk->callback_lock);
2973 cep->csk->user_data = NULL;
2974 cconn->cep = NULL;
2975 write_unlock_bh(&csk->callback_lock);
2976 }
2977 iscsi_destroy_endpoint(ep);
2978
2979 if (likely(csk->state >= CTP_ESTABLISHED))
2980 need_active_close(csk);
2981 else
2982 cxgbi_sock_closed(csk);
2983
2984 cxgbi_sock_put(csk);
2985}
2986EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2987
2988int cxgbi_iscsi_init(struct iscsi_transport *itp,
2989 struct scsi_transport_template **stt)
2990{
2991 *stt = iscsi_register_transport(itp);
2992 if (*stt == NULL) {
2993 pr_err("unable to register %s transport 0x%p.\n",
2994 itp->name, itp);
2995 return -ENODEV;
2996 }
2997 log_debug(1 << CXGBI_DBG_ISCSI,
2998 "%s, registered iscsi transport 0x%p.\n",
2999 itp->name, stt);
3000 return 0;
3001}
3002EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
3003
3004void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
3005 struct scsi_transport_template **stt)
3006{
3007 if (*stt) {
3008 log_debug(1 << CXGBI_DBG_ISCSI,
3009 "de-register transport 0x%p, %s, stt 0x%p.\n",
3010 itp, itp->name, *stt);
3011 *stt = NULL;
3012 iscsi_unregister_transport(itp);
3013 }
3014}
3015EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
3016
3017umode_t cxgbi_attr_is_visible(int param_type, int param)
3018{
3019 switch (param_type) {
3020 case ISCSI_HOST_PARAM:
3021 switch (param) {
3022 case ISCSI_HOST_PARAM_NETDEV_NAME:
3023 case ISCSI_HOST_PARAM_HWADDRESS:
3024 case ISCSI_HOST_PARAM_IPADDRESS:
3025 case ISCSI_HOST_PARAM_INITIATOR_NAME:
3026 return S_IRUGO;
3027 default:
3028 return 0;
3029 }
3030 case ISCSI_PARAM:
3031 switch (param) {
3032 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3033 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3034 case ISCSI_PARAM_HDRDGST_EN:
3035 case ISCSI_PARAM_DATADGST_EN:
3036 case ISCSI_PARAM_CONN_ADDRESS:
3037 case ISCSI_PARAM_CONN_PORT:
3038 case ISCSI_PARAM_EXP_STATSN:
3039 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3040 case ISCSI_PARAM_PERSISTENT_PORT:
3041 case ISCSI_PARAM_PING_TMO:
3042 case ISCSI_PARAM_RECV_TMO:
3043 case ISCSI_PARAM_INITIAL_R2T_EN:
3044 case ISCSI_PARAM_MAX_R2T:
3045 case ISCSI_PARAM_IMM_DATA_EN:
3046 case ISCSI_PARAM_FIRST_BURST:
3047 case ISCSI_PARAM_MAX_BURST:
3048 case ISCSI_PARAM_PDU_INORDER_EN:
3049 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3050 case ISCSI_PARAM_ERL:
3051 case ISCSI_PARAM_TARGET_NAME:
3052 case ISCSI_PARAM_TPGT:
3053 case ISCSI_PARAM_USERNAME:
3054 case ISCSI_PARAM_PASSWORD:
3055 case ISCSI_PARAM_USERNAME_IN:
3056 case ISCSI_PARAM_PASSWORD_IN:
3057 case ISCSI_PARAM_FAST_ABORT:
3058 case ISCSI_PARAM_ABORT_TMO:
3059 case ISCSI_PARAM_LU_RESET_TMO:
3060 case ISCSI_PARAM_TGT_RESET_TMO:
3061 case ISCSI_PARAM_IFACE_NAME:
3062 case ISCSI_PARAM_INITIATOR_NAME:
3063 return S_IRUGO;
3064 default:
3065 return 0;
3066 }
3067 }
3068
3069 return 0;
3070}
3071EXPORT_SYMBOL_GPL(cxgbi_attr_is_visible);
3072
3073static int __init libcxgbi_init_module(void)
3074{
3075 pr_info("%s", version);
3076
3077 BUILD_BUG_ON(sizeof_field(struct sk_buff, cb) <
3078 sizeof(struct cxgbi_skb_cb));
3079 rsvd_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3080 if (!rsvd_page)
3081 return -ENOMEM;
3082
3083 return 0;
3084}
3085
3086static void __exit libcxgbi_exit_module(void)
3087{
3088 cxgbi_device_unregister_all(0xFF);
3089 put_page(rsvd_page);
3090 return;
3091}
3092
3093module_init(libcxgbi_init_module);
3094module_exit(libcxgbi_exit_module);