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
35 static 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
44 static char version[] =
45 DRV_MODULE_DESC " " DRV_MODULE_NAME
46 " v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
47
48 MODULE_AUTHOR("Chelsio Communications, Inc.");
49 MODULE_DESCRIPTION(DRV_MODULE_DESC);
50 MODULE_VERSION(DRV_MODULE_VERSION);
51 MODULE_LICENSE("GPL");
52
53 module_param(dbg_level, uint, 0644);
54 MODULE_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 */
61 static LIST_HEAD(cdev_list);
62 static DEFINE_MUTEX(cdev_mutex);
63
64 static LIST_HEAD(cdev_rcu_list);
65 static DEFINE_SPINLOCK(cdev_rcu_lock);
66
cxgbi_decode_sw_tag(u32 sw_tag,int * idx,int * age)67 static 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
cxgbi_device_portmap_create(struct cxgbi_device * cdev,unsigned int base,unsigned int max_conn)75 int 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 }
93 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_create);
94
cxgbi_device_portmap_cleanup(struct cxgbi_device * cdev)95 void 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 }
116 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_cleanup);
117
cxgbi_device_destroy(struct cxgbi_device * cdev)118 static 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
cxgbi_device_register(unsigned int extra,unsigned int nports)131 struct 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 }
164 EXPORT_SYMBOL_GPL(cxgbi_device_register);
165
cxgbi_device_unregister(struct cxgbi_device * cdev)166 void 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 }
183 EXPORT_SYMBOL_GPL(cxgbi_device_unregister);
184
cxgbi_device_unregister_all(unsigned int flag)185 void 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 }
199 EXPORT_SYMBOL_GPL(cxgbi_device_unregister_all);
200
cxgbi_device_find_by_lldev(void * lldev)201 struct 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 }
218 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev);
219
cxgbi_device_find_by_netdev(struct net_device * ndev,int * port)220 struct 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 }
251 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev);
252
cxgbi_device_find_by_netdev_rcu(struct net_device * ndev,int * port)253 struct 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 }
284 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev_rcu);
285
286 #if IS_ENABLED(CONFIG_IPV6)
cxgbi_device_find_by_mac(struct net_device * ndev,int * port)287 static struct cxgbi_device *cxgbi_device_find_by_mac(struct net_device *ndev,
288 int *port)
289 {
290 struct net_device *vdev = NULL;
291 struct cxgbi_device *cdev, *tmp;
292 int i;
293
294 if (is_vlan_dev(ndev)) {
295 vdev = ndev;
296 ndev = vlan_dev_real_dev(ndev);
297 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
298 }
299
300 mutex_lock(&cdev_mutex);
301 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
302 for (i = 0; i < cdev->nports; i++) {
303 if (!memcmp(ndev->dev_addr, cdev->ports[i]->dev_addr,
304 MAX_ADDR_LEN)) {
305 cdev->hbas[i]->vdev = vdev;
306 mutex_unlock(&cdev_mutex);
307 if (port)
308 *port = i;
309 return cdev;
310 }
311 }
312 }
313 mutex_unlock(&cdev_mutex);
314 log_debug(1 << CXGBI_DBG_DEV,
315 "ndev 0x%p, %s, NO match mac found.\n",
316 ndev, ndev->name);
317 return NULL;
318 }
319 #endif
320
cxgbi_hbas_remove(struct cxgbi_device * cdev)321 void cxgbi_hbas_remove(struct cxgbi_device *cdev)
322 {
323 int i;
324 struct cxgbi_hba *chba;
325
326 log_debug(1 << CXGBI_DBG_DEV,
327 "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
328
329 for (i = 0; i < cdev->nports; i++) {
330 chba = cdev->hbas[i];
331 if (chba) {
332 cdev->hbas[i] = NULL;
333 iscsi_host_remove(chba->shost);
334 pci_dev_put(cdev->pdev);
335 iscsi_host_free(chba->shost);
336 }
337 }
338 }
339 EXPORT_SYMBOL_GPL(cxgbi_hbas_remove);
340
cxgbi_hbas_add(struct cxgbi_device * cdev,u64 max_lun,unsigned int max_id,struct scsi_host_template * sht,struct scsi_transport_template * stt)341 int cxgbi_hbas_add(struct cxgbi_device *cdev, u64 max_lun,
342 unsigned int max_id, struct scsi_host_template *sht,
343 struct scsi_transport_template *stt)
344 {
345 struct cxgbi_hba *chba;
346 struct Scsi_Host *shost;
347 int i, err;
348
349 log_debug(1 << CXGBI_DBG_DEV, "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
350
351 for (i = 0; i < cdev->nports; i++) {
352 shost = iscsi_host_alloc(sht, sizeof(*chba), 1);
353 if (!shost) {
354 pr_info("0x%p, p%d, %s, host alloc failed.\n",
355 cdev, i, cdev->ports[i]->name);
356 err = -ENOMEM;
357 goto err_out;
358 }
359
360 shost->transportt = stt;
361 shost->max_lun = max_lun;
362 shost->max_id = max_id;
363 shost->max_channel = 0;
364 shost->max_cmd_len = 16;
365
366 chba = iscsi_host_priv(shost);
367 chba->cdev = cdev;
368 chba->ndev = cdev->ports[i];
369 chba->shost = shost;
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
390 err_out:
391 cxgbi_hbas_remove(cdev);
392 return err;
393 }
394 EXPORT_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
find_sock_on_port(struct cxgbi_device * cdev,unsigned char port_id)411 static 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
sock_get_port(struct cxgbi_sock * csk)439 static 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
sock_put_port(struct cxgbi_sock * csk)500 static 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 */
cxgbi_sock_free_cpl_skbs(struct cxgbi_sock * csk)540 void 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 }
555 EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs);
556
cxgbi_sock_create(struct cxgbi_device * cdev)557 static 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 setup_timer(&csk->retry_timer, NULL, (unsigned long)csk);
577 rwlock_init(&csk->callback_lock);
578 csk->cdev = cdev;
579 csk->flags = 0;
580 cxgbi_sock_set_state(csk, CTP_CLOSED);
581
582 log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk);
583
584 return csk;
585 }
586
find_route_ipv4(struct flowi4 * fl4,__be32 saddr,__be32 daddr,__be16 sport,__be16 dport,u8 tos,int ifindex)587 static struct rtable *find_route_ipv4(struct flowi4 *fl4,
588 __be32 saddr, __be32 daddr,
589 __be16 sport, __be16 dport, u8 tos,
590 int ifindex)
591 {
592 struct rtable *rt;
593
594 rt = ip_route_output_ports(&init_net, fl4, NULL, daddr, saddr,
595 dport, sport, IPPROTO_TCP, tos, ifindex);
596 if (IS_ERR(rt))
597 return NULL;
598
599 return rt;
600 }
601
602 static struct cxgbi_sock *
cxgbi_check_route(struct sockaddr * dst_addr,int ifindex)603 cxgbi_check_route(struct sockaddr *dst_addr, int ifindex)
604 {
605 struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
606 struct dst_entry *dst;
607 struct net_device *ndev;
608 struct cxgbi_device *cdev;
609 struct rtable *rt = NULL;
610 struct neighbour *n;
611 struct flowi4 fl4;
612 struct cxgbi_sock *csk = NULL;
613 unsigned int mtu = 0;
614 int port = 0xFFFF;
615 int err = 0;
616
617 rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0,
618 daddr->sin_port, 0, ifindex);
619 if (!rt) {
620 pr_info("no route to ipv4 0x%x, port %u.\n",
621 be32_to_cpu(daddr->sin_addr.s_addr),
622 be16_to_cpu(daddr->sin_port));
623 err = -ENETUNREACH;
624 goto err_out;
625 }
626 dst = &rt->dst;
627 n = dst_neigh_lookup(dst, &daddr->sin_addr.s_addr);
628 if (!n) {
629 err = -ENODEV;
630 goto rel_rt;
631 }
632 ndev = n->dev;
633
634 if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
635 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
636 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
637 ndev->name);
638 err = -ENETUNREACH;
639 goto rel_neigh;
640 }
641
642 if (ndev->flags & IFF_LOOPBACK) {
643 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
644 if (!ndev) {
645 err = -ENETUNREACH;
646 goto rel_neigh;
647 }
648 mtu = ndev->mtu;
649 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
650 n->dev->name, ndev->name, mtu);
651 }
652
653 if (!(ndev->flags & IFF_UP) || !netif_carrier_ok(ndev)) {
654 pr_info("%s interface not up.\n", ndev->name);
655 err = -ENETDOWN;
656 goto rel_neigh;
657 }
658
659 cdev = cxgbi_device_find_by_netdev(ndev, &port);
660 if (!cdev) {
661 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
662 &daddr->sin_addr.s_addr, ndev->name);
663 err = -ENETUNREACH;
664 goto rel_neigh;
665 }
666 log_debug(1 << CXGBI_DBG_SOCK,
667 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
668 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
669 port, ndev->name, cdev);
670
671 csk = cxgbi_sock_create(cdev);
672 if (!csk) {
673 err = -ENOMEM;
674 goto rel_neigh;
675 }
676 csk->cdev = cdev;
677 csk->port_id = port;
678 csk->mtu = mtu;
679 csk->dst = dst;
680
681 csk->csk_family = AF_INET;
682 csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
683 csk->daddr.sin_port = daddr->sin_port;
684 csk->daddr.sin_family = daddr->sin_family;
685 csk->saddr.sin_family = daddr->sin_family;
686 csk->saddr.sin_addr.s_addr = fl4.saddr;
687 neigh_release(n);
688
689 return csk;
690
691 rel_neigh:
692 neigh_release(n);
693
694 rel_rt:
695 ip_rt_put(rt);
696 if (csk)
697 cxgbi_sock_closed(csk);
698 err_out:
699 return ERR_PTR(err);
700 }
701
702 #if IS_ENABLED(CONFIG_IPV6)
find_route_ipv6(const struct in6_addr * saddr,const struct in6_addr * daddr,int ifindex)703 static struct rt6_info *find_route_ipv6(const struct in6_addr *saddr,
704 const struct in6_addr *daddr,
705 int ifindex)
706 {
707 struct flowi6 fl;
708
709 memset(&fl, 0, sizeof(fl));
710 fl.flowi6_oif = ifindex;
711 if (saddr)
712 memcpy(&fl.saddr, saddr, sizeof(struct in6_addr));
713 if (daddr)
714 memcpy(&fl.daddr, daddr, sizeof(struct in6_addr));
715 return (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl);
716 }
717
718 static struct cxgbi_sock *
cxgbi_check_route6(struct sockaddr * dst_addr,int ifindex)719 cxgbi_check_route6(struct sockaddr *dst_addr, int ifindex)
720 {
721 struct sockaddr_in6 *daddr6 = (struct sockaddr_in6 *)dst_addr;
722 struct dst_entry *dst;
723 struct net_device *ndev;
724 struct cxgbi_device *cdev;
725 struct rt6_info *rt = NULL;
726 struct neighbour *n;
727 struct in6_addr pref_saddr;
728 struct cxgbi_sock *csk = NULL;
729 unsigned int mtu = 0;
730 int port = 0xFFFF;
731 int err = 0;
732
733 rt = find_route_ipv6(NULL, &daddr6->sin6_addr, ifindex);
734
735 if (!rt) {
736 pr_info("no route to ipv6 %pI6 port %u\n",
737 daddr6->sin6_addr.s6_addr,
738 be16_to_cpu(daddr6->sin6_port));
739 err = -ENETUNREACH;
740 goto err_out;
741 }
742
743 dst = &rt->dst;
744
745 n = dst_neigh_lookup(dst, &daddr6->sin6_addr);
746
747 if (!n) {
748 pr_info("%pI6, port %u, dst no neighbour.\n",
749 daddr6->sin6_addr.s6_addr,
750 be16_to_cpu(daddr6->sin6_port));
751 err = -ENETUNREACH;
752 goto rel_rt;
753 }
754 ndev = n->dev;
755
756 if (!(ndev->flags & IFF_UP) || !netif_carrier_ok(ndev)) {
757 pr_info("%s interface not up.\n", ndev->name);
758 err = -ENETDOWN;
759 goto rel_rt;
760 }
761
762 if (ipv6_addr_is_multicast(&daddr6->sin6_addr)) {
763 pr_info("multi-cast route %pI6 port %u, dev %s.\n",
764 daddr6->sin6_addr.s6_addr,
765 ntohs(daddr6->sin6_port), ndev->name);
766 err = -ENETUNREACH;
767 goto rel_rt;
768 }
769
770 cdev = cxgbi_device_find_by_netdev(ndev, &port);
771 if (!cdev)
772 cdev = cxgbi_device_find_by_mac(ndev, &port);
773 if (!cdev) {
774 pr_info("dst %pI6 %s, NOT cxgbi device.\n",
775 daddr6->sin6_addr.s6_addr, ndev->name);
776 err = -ENETUNREACH;
777 goto rel_rt;
778 }
779 log_debug(1 << CXGBI_DBG_SOCK,
780 "route to %pI6 :%u, ndev p#%d,%s, cdev 0x%p.\n",
781 daddr6->sin6_addr.s6_addr, ntohs(daddr6->sin6_port), port,
782 ndev->name, cdev);
783
784 csk = cxgbi_sock_create(cdev);
785 if (!csk) {
786 err = -ENOMEM;
787 goto rel_rt;
788 }
789 csk->cdev = cdev;
790 csk->port_id = port;
791 csk->mtu = mtu;
792 csk->dst = dst;
793
794 if (ipv6_addr_any(&rt->rt6i_prefsrc.addr)) {
795 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry *)rt);
796
797 err = ipv6_dev_get_saddr(&init_net, idev ? idev->dev : NULL,
798 &daddr6->sin6_addr, 0, &pref_saddr);
799 if (err) {
800 pr_info("failed to get source address to reach %pI6\n",
801 &daddr6->sin6_addr);
802 goto rel_rt;
803 }
804 } else {
805 pref_saddr = rt->rt6i_prefsrc.addr;
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
818 rel_rt:
819 if (n)
820 neigh_release(n);
821
822 ip6_rt_put(rt);
823 if (csk)
824 cxgbi_sock_closed(csk);
825 err_out:
826 return ERR_PTR(err);
827 }
828 #endif /* IS_ENABLED(CONFIG_IPV6) */
829
cxgbi_sock_established(struct cxgbi_sock * csk,unsigned int snd_isn,unsigned int opt)830 void 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 }
838 EXPORT_SYMBOL_GPL(cxgbi_sock_established);
839
cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock * csk)840 static 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
cxgbi_sock_closed(struct cxgbi_sock * csk)855 void 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 }
871 EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
872
need_active_close(struct cxgbi_sock * csk)873 static 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
cxgbi_sock_fail_act_open(struct cxgbi_sock * csk,int errno)907 void 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 }
919 EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
920
cxgbi_sock_act_open_req_arp_failure(void * handle,struct sk_buff * skb)921 void 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 }
938 EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
939
cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock * csk)940 void 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 }
957 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
958
cxgbi_sock_rcv_peer_close(struct cxgbi_sock * csk)959 void 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);
986 done:
987 spin_unlock_bh(&csk->lock);
988 cxgbi_sock_put(csk);
989 }
990 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
991
cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock * csk,u32 snd_nxt)992 void 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 }
1017 done:
1018 spin_unlock_bh(&csk->lock);
1019 cxgbi_sock_put(csk);
1020 }
1021 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
1022
cxgbi_sock_rcv_wr_ack(struct cxgbi_sock * csk,unsigned int credits,unsigned int snd_una,int seq_chk)1023 void 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);
1082 done:
1083 spin_unlock_bh(&csk->lock);
1084 }
1085 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
1086
cxgbi_sock_find_best_mtu(struct cxgbi_sock * csk,unsigned short mtu)1087 static 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
cxgbi_sock_select_mss(struct cxgbi_sock * csk,unsigned int pmtu)1098 unsigned 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 }
1113 EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
1114
cxgbi_sock_skb_entail(struct cxgbi_sock * csk,struct sk_buff * skb)1115 void 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 }
1120 EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
1121
cxgbi_sock_purge_wr_queue(struct cxgbi_sock * csk)1122 void 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 }
1129 EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
1130
cxgbi_sock_check_wr_invariants(const struct cxgbi_sock * csk)1131 void 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 }
1139 EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
1140
cxgbi_sock_send_pdus(struct cxgbi_sock * csk,struct sk_buff * skb)1141 static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
1142 {
1143 struct cxgbi_device *cdev = csk->cdev;
1144 struct sk_buff *next;
1145 int err, copied = 0;
1146
1147 spin_lock_bh(&csk->lock);
1148
1149 if (csk->state != CTP_ESTABLISHED) {
1150 log_debug(1 << CXGBI_DBG_PDU_TX,
1151 "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
1152 csk, csk->state, csk->flags, csk->tid);
1153 err = -EAGAIN;
1154 goto out_err;
1155 }
1156
1157 if (csk->err) {
1158 log_debug(1 << CXGBI_DBG_PDU_TX,
1159 "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
1160 csk, csk->state, csk->flags, csk->tid, csk->err);
1161 err = -EPIPE;
1162 goto out_err;
1163 }
1164
1165 if (csk->write_seq - csk->snd_una >= csk->snd_win) {
1166 log_debug(1 << CXGBI_DBG_PDU_TX,
1167 "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
1168 csk, csk->state, csk->flags, csk->tid, csk->write_seq,
1169 csk->snd_una, csk->snd_win);
1170 err = -ENOBUFS;
1171 goto out_err;
1172 }
1173
1174 while (skb) {
1175 int frags = skb_shinfo(skb)->nr_frags +
1176 (skb->len != skb->data_len);
1177
1178 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
1179 pr_err("csk 0x%p, skb head %u < %u.\n",
1180 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
1181 err = -EINVAL;
1182 goto out_err;
1183 }
1184
1185 if (frags >= SKB_WR_LIST_SIZE) {
1186 pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
1187 csk, skb_shinfo(skb)->nr_frags, skb->len,
1188 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
1189 err = -EINVAL;
1190 goto out_err;
1191 }
1192
1193 next = skb->next;
1194 skb->next = NULL;
1195 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
1196 cxgbi_sock_skb_entail(csk, skb);
1197 copied += skb->len;
1198 csk->write_seq += skb->len +
1199 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
1200 skb = next;
1201 }
1202
1203 if (likely(skb_queue_len(&csk->write_queue)))
1204 cdev->csk_push_tx_frames(csk, 1);
1205 done:
1206 spin_unlock_bh(&csk->lock);
1207 return copied;
1208
1209 out_err:
1210 if (copied == 0 && err == -EPIPE)
1211 copied = csk->err ? csk->err : -EPIPE;
1212 else
1213 copied = err;
1214 goto done;
1215 }
1216
1217 static inline void
scmd_get_params(struct scsi_cmnd * sc,struct scatterlist ** sgl,unsigned int * sgcnt,unsigned int * dlen,unsigned int prot)1218 scmd_get_params(struct scsi_cmnd *sc, struct scatterlist **sgl,
1219 unsigned int *sgcnt, unsigned int *dlen,
1220 unsigned int prot)
1221 {
1222 struct scsi_data_buffer *sdb = prot ? scsi_prot(sc) : scsi_out(sc);
1223
1224 *sgl = sdb->table.sgl;
1225 *sgcnt = sdb->table.nents;
1226 *dlen = sdb->length;
1227 /* Caution: for protection sdb, sdb->length is invalid */
1228 }
1229
cxgbi_ddp_set_one_ppod(struct cxgbi_pagepod * ppod,struct cxgbi_task_tag_info * ttinfo,struct scatterlist ** sg_pp,unsigned int * sg_off)1230 void cxgbi_ddp_set_one_ppod(struct cxgbi_pagepod *ppod,
1231 struct cxgbi_task_tag_info *ttinfo,
1232 struct scatterlist **sg_pp, unsigned int *sg_off)
1233 {
1234 struct scatterlist *sg = sg_pp ? *sg_pp : NULL;
1235 unsigned int offset = sg_off ? *sg_off : 0;
1236 dma_addr_t addr = 0UL;
1237 unsigned int len = 0;
1238 int i;
1239
1240 memcpy(ppod, &ttinfo->hdr, sizeof(struct cxgbi_pagepod_hdr));
1241
1242 if (sg) {
1243 addr = sg_dma_address(sg);
1244 len = sg_dma_len(sg);
1245 }
1246
1247 for (i = 0; i < PPOD_PAGES_MAX; i++) {
1248 if (sg) {
1249 ppod->addr[i] = cpu_to_be64(addr + offset);
1250 offset += PAGE_SIZE;
1251 if (offset == (len + sg->offset)) {
1252 offset = 0;
1253 sg = sg_next(sg);
1254 if (sg) {
1255 addr = sg_dma_address(sg);
1256 len = sg_dma_len(sg);
1257 }
1258 }
1259 } else {
1260 ppod->addr[i] = 0ULL;
1261 }
1262 }
1263
1264 /*
1265 * the fifth address needs to be repeated in the next ppod, so do
1266 * not move sg
1267 */
1268 if (sg_pp) {
1269 *sg_pp = sg;
1270 *sg_off = offset;
1271 }
1272
1273 if (offset == len) {
1274 offset = 0;
1275 sg = sg_next(sg);
1276 if (sg) {
1277 addr = sg_dma_address(sg);
1278 len = sg_dma_len(sg);
1279 }
1280 }
1281 ppod->addr[i] = sg ? cpu_to_be64(addr + offset) : 0ULL;
1282 }
1283 EXPORT_SYMBOL_GPL(cxgbi_ddp_set_one_ppod);
1284
1285 /*
1286 * APIs interacting with open-iscsi libraries
1287 */
1288
1289 static unsigned char padding[4];
1290
cxgbi_ddp_ppm_setup(void ** ppm_pp,struct cxgbi_device * cdev,struct cxgbi_tag_format * tformat,unsigned int ppmax,unsigned int llimit,unsigned int start,unsigned int rsvd_factor)1291 void cxgbi_ddp_ppm_setup(void **ppm_pp, struct cxgbi_device *cdev,
1292 struct cxgbi_tag_format *tformat, unsigned int ppmax,
1293 unsigned int llimit, unsigned int start,
1294 unsigned int rsvd_factor)
1295 {
1296 int err = cxgbi_ppm_init(ppm_pp, cdev->ports[0], cdev->pdev,
1297 cdev->lldev, tformat, ppmax, llimit, start,
1298 rsvd_factor);
1299
1300 if (err >= 0) {
1301 struct cxgbi_ppm *ppm = (struct cxgbi_ppm *)(*ppm_pp);
1302
1303 if (ppm->ppmax < 1024 ||
1304 ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX)
1305 cdev->flags |= CXGBI_FLAG_DDP_OFF;
1306 err = 0;
1307 } else {
1308 cdev->flags |= CXGBI_FLAG_DDP_OFF;
1309 }
1310 }
1311 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppm_setup);
1312
cxgbi_ddp_sgl_check(struct scatterlist * sgl,int nents)1313 static int cxgbi_ddp_sgl_check(struct scatterlist *sgl, int nents)
1314 {
1315 int i;
1316 int last_sgidx = nents - 1;
1317 struct scatterlist *sg = sgl;
1318
1319 for (i = 0; i < nents; i++, sg = sg_next(sg)) {
1320 unsigned int len = sg->length + sg->offset;
1321
1322 if ((sg->offset & 0x3) || (i && sg->offset) ||
1323 ((i != last_sgidx) && len != PAGE_SIZE)) {
1324 log_debug(1 << CXGBI_DBG_DDP,
1325 "sg %u/%u, %u,%u, not aligned.\n",
1326 i, nents, sg->offset, sg->length);
1327 goto err_out;
1328 }
1329 }
1330 return 0;
1331 err_out:
1332 return -EINVAL;
1333 }
1334
cxgbi_ddp_reserve(struct cxgbi_conn * cconn,struct cxgbi_task_data * tdata,u32 sw_tag,unsigned int xferlen)1335 static int cxgbi_ddp_reserve(struct cxgbi_conn *cconn,
1336 struct cxgbi_task_data *tdata, u32 sw_tag,
1337 unsigned int xferlen)
1338 {
1339 struct cxgbi_sock *csk = cconn->cep->csk;
1340 struct cxgbi_device *cdev = csk->cdev;
1341 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1342 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1343 struct scatterlist *sgl = ttinfo->sgl;
1344 unsigned int sgcnt = ttinfo->nents;
1345 unsigned int sg_offset = sgl->offset;
1346 int err;
1347
1348 if (cdev->flags & CXGBI_FLAG_DDP_OFF) {
1349 log_debug(1 << CXGBI_DBG_DDP,
1350 "cdev 0x%p DDP off.\n", cdev);
1351 return -EINVAL;
1352 }
1353
1354 if (!ppm || xferlen < DDP_THRESHOLD || !sgcnt ||
1355 ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX) {
1356 log_debug(1 << CXGBI_DBG_DDP,
1357 "ppm 0x%p, pgidx %u, xfer %u, sgcnt %u, NO ddp.\n",
1358 ppm, ppm ? ppm->tformat.pgsz_idx_dflt : DDP_PGIDX_MAX,
1359 xferlen, ttinfo->nents);
1360 return -EINVAL;
1361 }
1362
1363 /* make sure the buffer is suitable for ddp */
1364 if (cxgbi_ddp_sgl_check(sgl, sgcnt) < 0)
1365 return -EINVAL;
1366
1367 ttinfo->nr_pages = (xferlen + sgl->offset + (1 << PAGE_SHIFT) - 1) >>
1368 PAGE_SHIFT;
1369
1370 /*
1371 * the ddp tag will be used for the itt in the outgoing pdu,
1372 * the itt genrated by libiscsi is saved in the ppm and can be
1373 * retrieved via the ddp tag
1374 */
1375 err = cxgbi_ppm_ppods_reserve(ppm, ttinfo->nr_pages, 0, &ttinfo->idx,
1376 &ttinfo->tag, (unsigned long)sw_tag);
1377 if (err < 0) {
1378 cconn->ddp_full++;
1379 return err;
1380 }
1381 ttinfo->npods = err;
1382
1383 /* setup dma from scsi command sgl */
1384 sgl->offset = 0;
1385 err = dma_map_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1386 sgl->offset = sg_offset;
1387 if (err == 0) {
1388 pr_info("%s: 0x%x, xfer %u, sgl %u dma mapping err.\n",
1389 __func__, sw_tag, xferlen, sgcnt);
1390 goto rel_ppods;
1391 }
1392 if (err != ttinfo->nr_pages) {
1393 log_debug(1 << CXGBI_DBG_DDP,
1394 "%s: sw tag 0x%x, xfer %u, sgl %u, dma count %d.\n",
1395 __func__, sw_tag, xferlen, sgcnt, err);
1396 }
1397
1398 ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_MAPPED;
1399 ttinfo->cid = csk->port_id;
1400
1401 cxgbi_ppm_make_ppod_hdr(ppm, ttinfo->tag, csk->tid, sgl->offset,
1402 xferlen, &ttinfo->hdr);
1403
1404 if (cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ) {
1405 /* write ppod from xmit_pdu (of iscsi_scsi_command pdu) */
1406 ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_VALID;
1407 } else {
1408 /* write ppod from control queue now */
1409 err = cdev->csk_ddp_set_map(ppm, csk, ttinfo);
1410 if (err < 0)
1411 goto rel_ppods;
1412 }
1413
1414 return 0;
1415
1416 rel_ppods:
1417 cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1418
1419 if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_MAPPED) {
1420 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_MAPPED;
1421 dma_unmap_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1422 }
1423 return -EINVAL;
1424 }
1425
task_release_itt(struct iscsi_task * task,itt_t hdr_itt)1426 static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1427 {
1428 struct scsi_cmnd *sc = task->sc;
1429 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1430 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1431 struct cxgbi_device *cdev = cconn->chba->cdev;
1432 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1433 u32 tag = ntohl((__force u32)hdr_itt);
1434
1435 log_debug(1 << CXGBI_DBG_DDP,
1436 "cdev 0x%p, task 0x%p, release tag 0x%x.\n",
1437 cdev, task, tag);
1438 if (sc &&
1439 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
1440 cxgbi_ppm_is_ddp_tag(ppm, tag)) {
1441 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1442 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1443
1444 if (!(cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ))
1445 cdev->csk_ddp_clear_map(cdev, ppm, ttinfo);
1446 cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1447 dma_unmap_sg(&ppm->pdev->dev, ttinfo->sgl, ttinfo->nents,
1448 DMA_FROM_DEVICE);
1449 }
1450 }
1451
cxgbi_build_sw_tag(u32 idx,u32 age)1452 static inline u32 cxgbi_build_sw_tag(u32 idx, u32 age)
1453 {
1454 /* assume idx and age both are < 0x7FFF (32767) */
1455 return (idx << 16) | age;
1456 }
1457
task_reserve_itt(struct iscsi_task * task,itt_t * hdr_itt)1458 static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1459 {
1460 struct scsi_cmnd *sc = task->sc;
1461 struct iscsi_conn *conn = task->conn;
1462 struct iscsi_session *sess = conn->session;
1463 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1464 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1465 struct cxgbi_device *cdev = cconn->chba->cdev;
1466 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1467 u32 sw_tag = cxgbi_build_sw_tag(task->itt, sess->age);
1468 u32 tag = 0;
1469 int err = -EINVAL;
1470
1471 if (sc &&
1472 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)
1473 ) {
1474 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1475 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1476
1477 scmd_get_params(sc, &ttinfo->sgl, &ttinfo->nents,
1478 &tdata->dlen, 0);
1479 err = cxgbi_ddp_reserve(cconn, tdata, sw_tag, tdata->dlen);
1480 if (!err)
1481 tag = ttinfo->tag;
1482 else
1483 log_debug(1 << CXGBI_DBG_DDP,
1484 "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1485 cconn->cep->csk, task, tdata->dlen,
1486 ttinfo->nents);
1487 }
1488
1489 if (err < 0) {
1490 err = cxgbi_ppm_make_non_ddp_tag(ppm, sw_tag, &tag);
1491 if (err < 0)
1492 return err;
1493 }
1494 /* the itt need to sent in big-endian order */
1495 *hdr_itt = (__force itt_t)htonl(tag);
1496
1497 log_debug(1 << CXGBI_DBG_DDP,
1498 "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1499 cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1500 return 0;
1501 }
1502
cxgbi_parse_pdu_itt(struct iscsi_conn * conn,itt_t itt,int * idx,int * age)1503 void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1504 {
1505 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1506 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1507 struct cxgbi_device *cdev = cconn->chba->cdev;
1508 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1509 u32 tag = ntohl((__force u32)itt);
1510 u32 sw_bits;
1511
1512 if (ppm) {
1513 if (cxgbi_ppm_is_ddp_tag(ppm, tag))
1514 sw_bits = cxgbi_ppm_get_tag_caller_data(ppm, tag);
1515 else
1516 sw_bits = cxgbi_ppm_decode_non_ddp_tag(ppm, tag);
1517 } else {
1518 sw_bits = tag;
1519 }
1520
1521 cxgbi_decode_sw_tag(sw_bits, idx, age);
1522 log_debug(1 << CXGBI_DBG_DDP,
1523 "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1524 cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1525 age ? *age : 0xFF);
1526 }
1527 EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1528
cxgbi_conn_tx_open(struct cxgbi_sock * csk)1529 void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1530 {
1531 struct iscsi_conn *conn = csk->user_data;
1532
1533 if (conn) {
1534 log_debug(1 << CXGBI_DBG_SOCK,
1535 "csk 0x%p, cid %d.\n", csk, conn->id);
1536 iscsi_conn_queue_work(conn);
1537 }
1538 }
1539 EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1540
1541 /*
1542 * pdu receive, interact with libiscsi_tcp
1543 */
read_pdu_skb(struct iscsi_conn * conn,struct sk_buff * skb,unsigned int offset,int offloaded)1544 static inline int read_pdu_skb(struct iscsi_conn *conn,
1545 struct sk_buff *skb,
1546 unsigned int offset,
1547 int offloaded)
1548 {
1549 int status = 0;
1550 int bytes_read;
1551
1552 bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1553 switch (status) {
1554 case ISCSI_TCP_CONN_ERR:
1555 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1556 skb, offset, offloaded);
1557 return -EIO;
1558 case ISCSI_TCP_SUSPENDED:
1559 log_debug(1 << CXGBI_DBG_PDU_RX,
1560 "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1561 skb, offset, offloaded, bytes_read);
1562 /* no transfer - just have caller flush queue */
1563 return bytes_read;
1564 case ISCSI_TCP_SKB_DONE:
1565 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1566 skb, offset, offloaded);
1567 /*
1568 * pdus should always fit in the skb and we should get
1569 * segment done notifcation.
1570 */
1571 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1572 return -EFAULT;
1573 case ISCSI_TCP_SEGMENT_DONE:
1574 log_debug(1 << CXGBI_DBG_PDU_RX,
1575 "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1576 skb, offset, offloaded, bytes_read);
1577 return bytes_read;
1578 default:
1579 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1580 skb, offset, offloaded, status);
1581 return -EINVAL;
1582 }
1583 }
1584
1585 static int
skb_read_pdu_bhs(struct cxgbi_sock * csk,struct iscsi_conn * conn,struct sk_buff * skb)1586 skb_read_pdu_bhs(struct cxgbi_sock *csk, struct iscsi_conn *conn,
1587 struct sk_buff *skb)
1588 {
1589 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1590 int err;
1591
1592 log_debug(1 << CXGBI_DBG_PDU_RX,
1593 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1594 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1595
1596 if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1597 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1598 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1599 return -EIO;
1600 }
1601
1602 if (conn->hdrdgst_en &&
1603 cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1604 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1605 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1606 return -EIO;
1607 }
1608
1609 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_ISCSI_COMPL) &&
1610 cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA_DDPD)) {
1611 /* If completion flag is set and data is directly
1612 * placed in to the host memory then update
1613 * task->exp_datasn to the datasn in completion
1614 * iSCSI hdr as T6 adapter generates completion only
1615 * for the last pdu of a sequence.
1616 */
1617 itt_t itt = ((struct iscsi_data *)skb->data)->itt;
1618 struct iscsi_task *task = iscsi_itt_to_ctask(conn, itt);
1619 u32 data_sn = be32_to_cpu(((struct iscsi_data *)
1620 skb->data)->datasn);
1621 if (task && task->sc) {
1622 struct iscsi_tcp_task *tcp_task = task->dd_data;
1623
1624 tcp_task->exp_datasn = data_sn;
1625 }
1626 }
1627
1628 err = read_pdu_skb(conn, skb, 0, 0);
1629 if (likely(err >= 0)) {
1630 struct iscsi_hdr *hdr = (struct iscsi_hdr *)skb->data;
1631 u8 opcode = hdr->opcode & ISCSI_OPCODE_MASK;
1632
1633 if (unlikely(opcode == ISCSI_OP_LOGOUT_RSP))
1634 cxgbi_sock_set_flag(csk, CTPF_LOGOUT_RSP_RCVD);
1635 }
1636
1637 return err;
1638 }
1639
skb_read_pdu_data(struct iscsi_conn * conn,struct sk_buff * lskb,struct sk_buff * skb,unsigned int offset)1640 static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1641 struct sk_buff *skb, unsigned int offset)
1642 {
1643 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1644 bool offloaded = 0;
1645 int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1646
1647 log_debug(1 << CXGBI_DBG_PDU_RX,
1648 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1649 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1650
1651 if (conn->datadgst_en &&
1652 cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1653 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1654 conn, lskb, cxgbi_skcb_flags(lskb));
1655 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1656 return -EIO;
1657 }
1658
1659 if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1660 return 0;
1661
1662 /* coalesced, add header digest length */
1663 if (lskb == skb && conn->hdrdgst_en)
1664 offset += ISCSI_DIGEST_SIZE;
1665
1666 if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1667 offloaded = 1;
1668
1669 if (opcode == ISCSI_OP_SCSI_DATA_IN)
1670 log_debug(1 << CXGBI_DBG_PDU_RX,
1671 "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1672 skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1673 tcp_conn->in.datalen, offloaded ? "is" : "not");
1674
1675 return read_pdu_skb(conn, skb, offset, offloaded);
1676 }
1677
csk_return_rx_credits(struct cxgbi_sock * csk,int copied)1678 static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1679 {
1680 struct cxgbi_device *cdev = csk->cdev;
1681 int must_send;
1682 u32 credits;
1683
1684 log_debug(1 << CXGBI_DBG_PDU_RX,
1685 "csk 0x%p,%u,0x%lx,%u, seq %u, wup %u, thre %u, %u.\n",
1686 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1687 csk->rcv_wup, cdev->rx_credit_thres,
1688 csk->rcv_win);
1689
1690 if (!cdev->rx_credit_thres)
1691 return;
1692
1693 if (csk->state != CTP_ESTABLISHED)
1694 return;
1695
1696 credits = csk->copied_seq - csk->rcv_wup;
1697 if (unlikely(!credits))
1698 return;
1699 must_send = credits + 16384 >= csk->rcv_win;
1700 if (must_send || credits >= cdev->rx_credit_thres)
1701 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1702 }
1703
cxgbi_conn_pdu_ready(struct cxgbi_sock * csk)1704 void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1705 {
1706 struct cxgbi_device *cdev = csk->cdev;
1707 struct iscsi_conn *conn = csk->user_data;
1708 struct sk_buff *skb;
1709 unsigned int read = 0;
1710 int err = 0;
1711
1712 log_debug(1 << CXGBI_DBG_PDU_RX,
1713 "csk 0x%p, conn 0x%p.\n", csk, conn);
1714
1715 if (unlikely(!conn || conn->suspend_rx)) {
1716 log_debug(1 << CXGBI_DBG_PDU_RX,
1717 "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1718 csk, conn, conn ? conn->id : 0xFF,
1719 conn ? conn->suspend_rx : 0xFF);
1720 return;
1721 }
1722
1723 while (!err) {
1724 skb = skb_peek(&csk->receive_queue);
1725 if (!skb ||
1726 !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1727 if (skb)
1728 log_debug(1 << CXGBI_DBG_PDU_RX,
1729 "skb 0x%p, NOT ready 0x%lx.\n",
1730 skb, cxgbi_skcb_flags(skb));
1731 break;
1732 }
1733 __skb_unlink(skb, &csk->receive_queue);
1734
1735 read += cxgbi_skcb_rx_pdulen(skb);
1736 log_debug(1 << CXGBI_DBG_PDU_RX,
1737 "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1738 csk, skb, skb->len, cxgbi_skcb_flags(skb),
1739 cxgbi_skcb_rx_pdulen(skb));
1740
1741 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1742 err = skb_read_pdu_bhs(csk, conn, skb);
1743 if (err < 0) {
1744 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1745 "f 0x%lx, plen %u.\n",
1746 csk, skb, skb->len,
1747 cxgbi_skcb_flags(skb),
1748 cxgbi_skcb_rx_pdulen(skb));
1749 goto skb_done;
1750 }
1751 err = skb_read_pdu_data(conn, skb, skb,
1752 err + cdev->skb_rx_extra);
1753 if (err < 0)
1754 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1755 "f 0x%lx, plen %u.\n",
1756 csk, skb, skb->len,
1757 cxgbi_skcb_flags(skb),
1758 cxgbi_skcb_rx_pdulen(skb));
1759 } else {
1760 err = skb_read_pdu_bhs(csk, conn, skb);
1761 if (err < 0) {
1762 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1763 "f 0x%lx, plen %u.\n",
1764 csk, skb, skb->len,
1765 cxgbi_skcb_flags(skb),
1766 cxgbi_skcb_rx_pdulen(skb));
1767 goto skb_done;
1768 }
1769
1770 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1771 struct sk_buff *dskb;
1772
1773 dskb = skb_peek(&csk->receive_queue);
1774 if (!dskb) {
1775 pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1776 " plen %u, NO data.\n",
1777 csk, skb, skb->len,
1778 cxgbi_skcb_flags(skb),
1779 cxgbi_skcb_rx_pdulen(skb));
1780 err = -EIO;
1781 goto skb_done;
1782 }
1783 __skb_unlink(dskb, &csk->receive_queue);
1784
1785 err = skb_read_pdu_data(conn, skb, dskb, 0);
1786 if (err < 0)
1787 pr_err("data, csk 0x%p, skb 0x%p,%u, "
1788 "f 0x%lx, plen %u, dskb 0x%p,"
1789 "%u.\n",
1790 csk, skb, skb->len,
1791 cxgbi_skcb_flags(skb),
1792 cxgbi_skcb_rx_pdulen(skb),
1793 dskb, dskb->len);
1794 __kfree_skb(dskb);
1795 } else
1796 err = skb_read_pdu_data(conn, skb, skb, 0);
1797 }
1798 skb_done:
1799 __kfree_skb(skb);
1800
1801 if (err < 0)
1802 break;
1803 }
1804
1805 log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
1806 if (read) {
1807 csk->copied_seq += read;
1808 csk_return_rx_credits(csk, read);
1809 conn->rxdata_octets += read;
1810 }
1811
1812 if (err < 0) {
1813 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
1814 csk, conn, err, read);
1815 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1816 }
1817 }
1818 EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
1819
sgl_seek_offset(struct scatterlist * sgl,unsigned int sgcnt,unsigned int offset,unsigned int * off,struct scatterlist ** sgp)1820 static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
1821 unsigned int offset, unsigned int *off,
1822 struct scatterlist **sgp)
1823 {
1824 int i;
1825 struct scatterlist *sg;
1826
1827 for_each_sg(sgl, sg, sgcnt, i) {
1828 if (offset < sg->length) {
1829 *off = offset;
1830 *sgp = sg;
1831 return 0;
1832 }
1833 offset -= sg->length;
1834 }
1835 return -EFAULT;
1836 }
1837
sgl_read_to_frags(struct scatterlist * sg,unsigned int sgoffset,unsigned int dlen,struct page_frag * frags,int frag_max)1838 static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
1839 unsigned int dlen, struct page_frag *frags,
1840 int frag_max)
1841 {
1842 unsigned int datalen = dlen;
1843 unsigned int sglen = sg->length - sgoffset;
1844 struct page *page = sg_page(sg);
1845 int i;
1846
1847 i = 0;
1848 do {
1849 unsigned int copy;
1850
1851 if (!sglen) {
1852 sg = sg_next(sg);
1853 if (!sg) {
1854 pr_warn("sg %d NULL, len %u/%u.\n",
1855 i, datalen, dlen);
1856 return -EINVAL;
1857 }
1858 sgoffset = 0;
1859 sglen = sg->length;
1860 page = sg_page(sg);
1861
1862 }
1863 copy = min(datalen, sglen);
1864 if (i && page == frags[i - 1].page &&
1865 sgoffset + sg->offset ==
1866 frags[i - 1].offset + frags[i - 1].size) {
1867 frags[i - 1].size += copy;
1868 } else {
1869 if (i >= frag_max) {
1870 pr_warn("too many pages %u, dlen %u.\n",
1871 frag_max, dlen);
1872 return -EINVAL;
1873 }
1874
1875 frags[i].page = page;
1876 frags[i].offset = sg->offset + sgoffset;
1877 frags[i].size = copy;
1878 i++;
1879 }
1880 datalen -= copy;
1881 sgoffset += copy;
1882 sglen -= copy;
1883 } while (datalen);
1884
1885 return i;
1886 }
1887
cxgbi_conn_alloc_pdu(struct iscsi_task * task,u8 opcode)1888 int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
1889 {
1890 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1891 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1892 struct cxgbi_device *cdev = cconn->chba->cdev;
1893 struct iscsi_conn *conn = task->conn;
1894 struct iscsi_tcp_task *tcp_task = task->dd_data;
1895 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1896 struct scsi_cmnd *sc = task->sc;
1897 int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
1898
1899 tcp_task->dd_data = tdata;
1900 task->hdr = NULL;
1901
1902 if (tdata->skb) {
1903 kfree_skb(tdata->skb);
1904 tdata->skb = NULL;
1905 }
1906
1907 if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
1908 (opcode == ISCSI_OP_SCSI_DATA_OUT ||
1909 (opcode == ISCSI_OP_SCSI_CMD &&
1910 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
1911 /* data could goes into skb head */
1912 headroom += min_t(unsigned int,
1913 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
1914 conn->max_xmit_dlength);
1915
1916 tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
1917 if (!tdata->skb) {
1918 struct cxgbi_sock *csk = cconn->cep->csk;
1919 struct net_device *ndev = cdev->ports[csk->port_id];
1920 ndev->stats.tx_dropped++;
1921 return -ENOMEM;
1922 }
1923
1924 skb_get(tdata->skb);
1925 skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
1926 task->hdr = (struct iscsi_hdr *)tdata->skb->data;
1927 task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
1928
1929 /* data_out uses scsi_cmd's itt */
1930 if (opcode != ISCSI_OP_SCSI_DATA_OUT)
1931 task_reserve_itt(task, &task->hdr->itt);
1932
1933 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1934 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
1935 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
1936 conn->max_xmit_dlength, ntohl(task->hdr->itt));
1937
1938 return 0;
1939 }
1940 EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
1941
tx_skb_setmode(struct sk_buff * skb,int hcrc,int dcrc)1942 static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
1943 {
1944 if (hcrc || dcrc) {
1945 u8 submode = 0;
1946
1947 if (hcrc)
1948 submode |= 1;
1949 if (dcrc)
1950 submode |= 2;
1951 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
1952 } else
1953 cxgbi_skcb_ulp_mode(skb) = 0;
1954 }
1955
cxgbi_conn_init_pdu(struct iscsi_task * task,unsigned int offset,unsigned int count)1956 int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
1957 unsigned int count)
1958 {
1959 struct iscsi_conn *conn = task->conn;
1960 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1961 struct sk_buff *skb = tdata->skb;
1962 unsigned int datalen = count;
1963 int i, padlen = iscsi_padding(count);
1964 struct page *pg;
1965
1966 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1967 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
1968 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
1969 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
1970
1971 skb_put(skb, task->hdr_len);
1972 tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
1973 if (!count)
1974 return 0;
1975
1976 if (task->sc) {
1977 struct scsi_data_buffer *sdb = scsi_out(task->sc);
1978 struct scatterlist *sg = NULL;
1979 int err;
1980
1981 tdata->offset = offset;
1982 tdata->count = count;
1983 err = sgl_seek_offset(
1984 sdb->table.sgl, sdb->table.nents,
1985 tdata->offset, &tdata->sgoffset, &sg);
1986 if (err < 0) {
1987 pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
1988 sdb->table.nents, tdata->offset, sdb->length);
1989 return err;
1990 }
1991 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
1992 tdata->frags, MAX_PDU_FRAGS);
1993 if (err < 0) {
1994 pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
1995 sdb->table.nents, tdata->offset, tdata->count);
1996 return err;
1997 }
1998 tdata->nr_frags = err;
1999
2000 if (tdata->nr_frags > MAX_SKB_FRAGS ||
2001 (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
2002 char *dst = skb->data + task->hdr_len;
2003 struct page_frag *frag = tdata->frags;
2004
2005 /* data fits in the skb's headroom */
2006 for (i = 0; i < tdata->nr_frags; i++, frag++) {
2007 char *src = kmap_atomic(frag->page);
2008
2009 memcpy(dst, src+frag->offset, frag->size);
2010 dst += frag->size;
2011 kunmap_atomic(src);
2012 }
2013 if (padlen) {
2014 memset(dst, 0, padlen);
2015 padlen = 0;
2016 }
2017 skb_put(skb, count + padlen);
2018 } else {
2019 /* data fit into frag_list */
2020 for (i = 0; i < tdata->nr_frags; i++) {
2021 __skb_fill_page_desc(skb, i,
2022 tdata->frags[i].page,
2023 tdata->frags[i].offset,
2024 tdata->frags[i].size);
2025 skb_frag_ref(skb, i);
2026 }
2027 skb_shinfo(skb)->nr_frags = tdata->nr_frags;
2028 skb->len += count;
2029 skb->data_len += count;
2030 skb->truesize += count;
2031 }
2032
2033 } else {
2034 pg = virt_to_page(task->data);
2035
2036 get_page(pg);
2037 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
2038 count);
2039 skb->len += count;
2040 skb->data_len += count;
2041 skb->truesize += count;
2042 }
2043
2044 if (padlen) {
2045 i = skb_shinfo(skb)->nr_frags;
2046 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
2047 virt_to_page(padding), offset_in_page(padding),
2048 padlen);
2049
2050 skb->data_len += padlen;
2051 skb->truesize += padlen;
2052 skb->len += padlen;
2053 }
2054
2055 return 0;
2056 }
2057 EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
2058
cxgbi_conn_xmit_pdu(struct iscsi_task * task)2059 int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2060 {
2061 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2062 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2063 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2064 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
2065 struct sk_buff *skb = tdata->skb;
2066 struct cxgbi_sock *csk = NULL;
2067 unsigned int datalen;
2068 int err;
2069
2070 if (!skb || cxgbi_skcb_test_flag(skb, SKCBF_TX_DONE)) {
2071 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2072 "task 0x%p, skb 0x%p\n", task, skb);
2073 return 0;
2074 }
2075
2076 if (cconn && cconn->cep)
2077 csk = cconn->cep->csk;
2078 if (!csk) {
2079 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2080 "task 0x%p, csk gone.\n", task);
2081 return -EPIPE;
2082 }
2083
2084 datalen = skb->data_len;
2085
2086 /* write ppod first if using ofldq to write ppod */
2087 if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_VALID) {
2088 struct cxgbi_ppm *ppm = csk->cdev->cdev2ppm(csk->cdev);
2089
2090 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_VALID;
2091 if (csk->cdev->csk_ddp_set_map(ppm, csk, ttinfo) < 0)
2092 pr_err("task 0x%p, ppod writing using ofldq failed.\n",
2093 task);
2094 /* continue. Let fl get the data */
2095 }
2096
2097 err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2098 if (err > 0) {
2099 int pdulen = err;
2100
2101 log_debug(1 << CXGBI_DBG_PDU_TX,
2102 "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2103 task, task->sc, skb, skb->len, skb->data_len, err);
2104
2105 if (task->conn->hdrdgst_en)
2106 pdulen += ISCSI_DIGEST_SIZE;
2107
2108 if (datalen && task->conn->datadgst_en)
2109 pdulen += ISCSI_DIGEST_SIZE;
2110
2111 task->conn->txdata_octets += pdulen;
2112 cxgbi_skcb_set_flag(skb, SKCBF_TX_DONE);
2113 return 0;
2114 }
2115
2116 if (err == -EAGAIN || err == -ENOBUFS) {
2117 log_debug(1 << CXGBI_DBG_PDU_TX,
2118 "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2119 task, skb, skb->len, skb->data_len, err);
2120 /* reset skb to send when we are called again */
2121 return err;
2122 }
2123
2124 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2125 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2126 task->itt, skb, skb->len, skb->data_len, err);
2127
2128 __kfree_skb(tdata->skb);
2129 tdata->skb = NULL;
2130
2131 iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2132 iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2133 return err;
2134 }
2135 EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2136
cxgbi_cleanup_task(struct iscsi_task * task)2137 void cxgbi_cleanup_task(struct iscsi_task *task)
2138 {
2139 struct iscsi_tcp_task *tcp_task = task->dd_data;
2140 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2141
2142 if (!tcp_task || !tdata || (tcp_task->dd_data != tdata)) {
2143 pr_info("task 0x%p,0x%p, tcp_task 0x%p, tdata 0x%p/0x%p.\n",
2144 task, task->sc, tcp_task,
2145 tcp_task ? tcp_task->dd_data : NULL, tdata);
2146 return;
2147 }
2148
2149 log_debug(1 << CXGBI_DBG_ISCSI,
2150 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2151 task, tdata->skb, task->hdr_itt);
2152
2153 tcp_task->dd_data = NULL;
2154 /* never reached the xmit task callout */
2155 if (tdata->skb) {
2156 kfree_skb(tdata->skb);
2157 tdata->skb = NULL;
2158 }
2159
2160 task_release_itt(task, task->hdr_itt);
2161 memset(tdata, 0, sizeof(*tdata));
2162
2163 iscsi_tcp_cleanup_task(task);
2164 }
2165 EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2166
cxgbi_get_conn_stats(struct iscsi_cls_conn * cls_conn,struct iscsi_stats * stats)2167 void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2168 struct iscsi_stats *stats)
2169 {
2170 struct iscsi_conn *conn = cls_conn->dd_data;
2171
2172 stats->txdata_octets = conn->txdata_octets;
2173 stats->rxdata_octets = conn->rxdata_octets;
2174 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2175 stats->dataout_pdus = conn->dataout_pdus_cnt;
2176 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2177 stats->datain_pdus = conn->datain_pdus_cnt;
2178 stats->r2t_pdus = conn->r2t_pdus_cnt;
2179 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2180 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2181 stats->digest_err = 0;
2182 stats->timeout_err = 0;
2183 stats->custom_length = 1;
2184 strcpy(stats->custom[0].desc, "eh_abort_cnt");
2185 stats->custom[0].value = conn->eh_abort_cnt;
2186 }
2187 EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2188
cxgbi_conn_max_xmit_dlength(struct iscsi_conn * conn)2189 static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2190 {
2191 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2192 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2193 struct cxgbi_device *cdev = cconn->chba->cdev;
2194 unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2195 unsigned int max_def = 512 * MAX_SKB_FRAGS;
2196 unsigned int max = max(max_def, headroom);
2197
2198 max = min(cconn->chba->cdev->tx_max_size, max);
2199 if (conn->max_xmit_dlength)
2200 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2201 else
2202 conn->max_xmit_dlength = max;
2203 cxgbi_align_pdu_size(conn->max_xmit_dlength);
2204
2205 return 0;
2206 }
2207
cxgbi_conn_max_recv_dlength(struct iscsi_conn * conn)2208 static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2209 {
2210 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2211 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2212 unsigned int max = cconn->chba->cdev->rx_max_size;
2213
2214 cxgbi_align_pdu_size(max);
2215
2216 if (conn->max_recv_dlength) {
2217 if (conn->max_recv_dlength > max) {
2218 pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2219 conn->max_recv_dlength, max);
2220 return -EINVAL;
2221 }
2222 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2223 cxgbi_align_pdu_size(conn->max_recv_dlength);
2224 } else
2225 conn->max_recv_dlength = max;
2226
2227 return 0;
2228 }
2229
cxgbi_set_conn_param(struct iscsi_cls_conn * cls_conn,enum iscsi_param param,char * buf,int buflen)2230 int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2231 enum iscsi_param param, char *buf, int buflen)
2232 {
2233 struct iscsi_conn *conn = cls_conn->dd_data;
2234 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2235 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2236 struct cxgbi_sock *csk = cconn->cep->csk;
2237 int err;
2238
2239 log_debug(1 << CXGBI_DBG_ISCSI,
2240 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2241 cls_conn, param, buflen, buf);
2242
2243 switch (param) {
2244 case ISCSI_PARAM_HDRDGST_EN:
2245 err = iscsi_set_param(cls_conn, param, buf, buflen);
2246 if (!err && conn->hdrdgst_en)
2247 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2248 conn->hdrdgst_en,
2249 conn->datadgst_en, 0);
2250 break;
2251 case ISCSI_PARAM_DATADGST_EN:
2252 err = iscsi_set_param(cls_conn, param, buf, buflen);
2253 if (!err && conn->datadgst_en)
2254 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2255 conn->hdrdgst_en,
2256 conn->datadgst_en, 0);
2257 break;
2258 case ISCSI_PARAM_MAX_R2T:
2259 return iscsi_tcp_set_max_r2t(conn, buf);
2260 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2261 err = iscsi_set_param(cls_conn, param, buf, buflen);
2262 if (!err)
2263 err = cxgbi_conn_max_recv_dlength(conn);
2264 break;
2265 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2266 err = iscsi_set_param(cls_conn, param, buf, buflen);
2267 if (!err)
2268 err = cxgbi_conn_max_xmit_dlength(conn);
2269 break;
2270 default:
2271 return iscsi_set_param(cls_conn, param, buf, buflen);
2272 }
2273 return err;
2274 }
2275 EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2276
csk_print_port(struct cxgbi_sock * csk,char * buf)2277 static inline int csk_print_port(struct cxgbi_sock *csk, char *buf)
2278 {
2279 int len;
2280
2281 cxgbi_sock_get(csk);
2282 len = sprintf(buf, "%hu\n", ntohs(csk->daddr.sin_port));
2283 cxgbi_sock_put(csk);
2284
2285 return len;
2286 }
2287
csk_print_ip(struct cxgbi_sock * csk,char * buf)2288 static inline int csk_print_ip(struct cxgbi_sock *csk, char *buf)
2289 {
2290 int len;
2291
2292 cxgbi_sock_get(csk);
2293 if (csk->csk_family == AF_INET)
2294 len = sprintf(buf, "%pI4",
2295 &csk->daddr.sin_addr.s_addr);
2296 else
2297 len = sprintf(buf, "%pI6",
2298 &csk->daddr6.sin6_addr);
2299
2300 cxgbi_sock_put(csk);
2301
2302 return len;
2303 }
2304
cxgbi_get_ep_param(struct iscsi_endpoint * ep,enum iscsi_param param,char * buf)2305 int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2306 char *buf)
2307 {
2308 struct cxgbi_endpoint *cep = ep->dd_data;
2309 struct cxgbi_sock *csk;
2310 int len;
2311
2312 log_debug(1 << CXGBI_DBG_ISCSI,
2313 "cls_conn 0x%p, param %d.\n", ep, param);
2314
2315 switch (param) {
2316 case ISCSI_PARAM_CONN_PORT:
2317 case ISCSI_PARAM_CONN_ADDRESS:
2318 if (!cep)
2319 return -ENOTCONN;
2320
2321 csk = cep->csk;
2322 if (!csk)
2323 return -ENOTCONN;
2324
2325 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2326 &csk->daddr, param, buf);
2327 default:
2328 return -ENOSYS;
2329 }
2330 return len;
2331 }
2332 EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
2333
2334 struct iscsi_cls_conn *
cxgbi_create_conn(struct iscsi_cls_session * cls_session,u32 cid)2335 cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2336 {
2337 struct iscsi_cls_conn *cls_conn;
2338 struct iscsi_conn *conn;
2339 struct iscsi_tcp_conn *tcp_conn;
2340 struct cxgbi_conn *cconn;
2341
2342 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2343 if (!cls_conn)
2344 return NULL;
2345
2346 conn = cls_conn->dd_data;
2347 tcp_conn = conn->dd_data;
2348 cconn = tcp_conn->dd_data;
2349 cconn->iconn = conn;
2350
2351 log_debug(1 << CXGBI_DBG_ISCSI,
2352 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2353 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2354
2355 return cls_conn;
2356 }
2357 EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2358
cxgbi_bind_conn(struct iscsi_cls_session * cls_session,struct iscsi_cls_conn * cls_conn,u64 transport_eph,int is_leading)2359 int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2360 struct iscsi_cls_conn *cls_conn,
2361 u64 transport_eph, int is_leading)
2362 {
2363 struct iscsi_conn *conn = cls_conn->dd_data;
2364 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2365 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2366 struct cxgbi_ppm *ppm;
2367 struct iscsi_endpoint *ep;
2368 struct cxgbi_endpoint *cep;
2369 struct cxgbi_sock *csk;
2370 int err;
2371
2372 ep = iscsi_lookup_endpoint(transport_eph);
2373 if (!ep)
2374 return -EINVAL;
2375
2376 /* setup ddp pagesize */
2377 cep = ep->dd_data;
2378 csk = cep->csk;
2379
2380 ppm = csk->cdev->cdev2ppm(csk->cdev);
2381 err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid,
2382 ppm->tformat.pgsz_idx_dflt, 0);
2383 if (err < 0)
2384 return err;
2385
2386 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2387 if (err)
2388 return -EINVAL;
2389
2390 /* calculate the tag idx bits needed for this conn based on cmds_max */
2391 cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2392
2393 write_lock_bh(&csk->callback_lock);
2394 csk->user_data = conn;
2395 cconn->chba = cep->chba;
2396 cconn->cep = cep;
2397 cep->cconn = cconn;
2398 write_unlock_bh(&csk->callback_lock);
2399
2400 cxgbi_conn_max_xmit_dlength(conn);
2401 cxgbi_conn_max_recv_dlength(conn);
2402
2403 log_debug(1 << CXGBI_DBG_ISCSI,
2404 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2405 cls_session, cls_conn, ep, cconn, csk);
2406 /* init recv engine */
2407 iscsi_tcp_hdr_recv_prep(tcp_conn);
2408
2409 return 0;
2410 }
2411 EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2412
cxgbi_create_session(struct iscsi_endpoint * ep,u16 cmds_max,u16 qdepth,u32 initial_cmdsn)2413 struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2414 u16 cmds_max, u16 qdepth,
2415 u32 initial_cmdsn)
2416 {
2417 struct cxgbi_endpoint *cep;
2418 struct cxgbi_hba *chba;
2419 struct Scsi_Host *shost;
2420 struct iscsi_cls_session *cls_session;
2421 struct iscsi_session *session;
2422
2423 if (!ep) {
2424 pr_err("missing endpoint.\n");
2425 return NULL;
2426 }
2427
2428 cep = ep->dd_data;
2429 chba = cep->chba;
2430 shost = chba->shost;
2431
2432 BUG_ON(chba != iscsi_host_priv(shost));
2433
2434 cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2435 cmds_max, 0,
2436 sizeof(struct iscsi_tcp_task) +
2437 sizeof(struct cxgbi_task_data),
2438 initial_cmdsn, ISCSI_MAX_TARGET);
2439 if (!cls_session)
2440 return NULL;
2441
2442 session = cls_session->dd_data;
2443 if (iscsi_tcp_r2tpool_alloc(session))
2444 goto remove_session;
2445
2446 log_debug(1 << CXGBI_DBG_ISCSI,
2447 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2448 return cls_session;
2449
2450 remove_session:
2451 iscsi_session_teardown(cls_session);
2452 return NULL;
2453 }
2454 EXPORT_SYMBOL_GPL(cxgbi_create_session);
2455
cxgbi_destroy_session(struct iscsi_cls_session * cls_session)2456 void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2457 {
2458 log_debug(1 << CXGBI_DBG_ISCSI,
2459 "cls sess 0x%p.\n", cls_session);
2460
2461 iscsi_tcp_r2tpool_free(cls_session->dd_data);
2462 iscsi_session_teardown(cls_session);
2463 }
2464 EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2465
cxgbi_set_host_param(struct Scsi_Host * shost,enum iscsi_host_param param,char * buf,int buflen)2466 int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2467 char *buf, int buflen)
2468 {
2469 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2470
2471 if (!chba->ndev) {
2472 shost_printk(KERN_ERR, shost, "Could not get host param. "
2473 "netdev for host not set.\n");
2474 return -ENODEV;
2475 }
2476
2477 log_debug(1 << CXGBI_DBG_ISCSI,
2478 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2479 shost, chba, chba->ndev->name, param, buflen, buf);
2480
2481 switch (param) {
2482 case ISCSI_HOST_PARAM_IPADDRESS:
2483 {
2484 __be32 addr = in_aton(buf);
2485 log_debug(1 << CXGBI_DBG_ISCSI,
2486 "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2487 cxgbi_set_iscsi_ipv4(chba, addr);
2488 return 0;
2489 }
2490 case ISCSI_HOST_PARAM_HWADDRESS:
2491 case ISCSI_HOST_PARAM_NETDEV_NAME:
2492 return 0;
2493 default:
2494 return iscsi_host_set_param(shost, param, buf, buflen);
2495 }
2496 }
2497 EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2498
cxgbi_get_host_param(struct Scsi_Host * shost,enum iscsi_host_param param,char * buf)2499 int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2500 char *buf)
2501 {
2502 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2503 int len = 0;
2504
2505 if (!chba->ndev) {
2506 shost_printk(KERN_ERR, shost, "Could not get host param. "
2507 "netdev for host not set.\n");
2508 return -ENODEV;
2509 }
2510
2511 log_debug(1 << CXGBI_DBG_ISCSI,
2512 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2513 shost, chba, chba->ndev->name, param);
2514
2515 switch (param) {
2516 case ISCSI_HOST_PARAM_HWADDRESS:
2517 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2518 break;
2519 case ISCSI_HOST_PARAM_NETDEV_NAME:
2520 len = sprintf(buf, "%s\n", chba->ndev->name);
2521 break;
2522 case ISCSI_HOST_PARAM_IPADDRESS:
2523 {
2524 struct cxgbi_sock *csk = find_sock_on_port(chba->cdev,
2525 chba->port_id);
2526 if (csk) {
2527 len = sprintf(buf, "%pIS",
2528 (struct sockaddr *)&csk->saddr);
2529 }
2530 log_debug(1 << CXGBI_DBG_ISCSI,
2531 "hba %s, addr %s.\n", chba->ndev->name, buf);
2532 break;
2533 }
2534 default:
2535 return iscsi_host_get_param(shost, param, buf);
2536 }
2537
2538 return len;
2539 }
2540 EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2541
cxgbi_ep_connect(struct Scsi_Host * shost,struct sockaddr * dst_addr,int non_blocking)2542 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2543 struct sockaddr *dst_addr,
2544 int non_blocking)
2545 {
2546 struct iscsi_endpoint *ep;
2547 struct cxgbi_endpoint *cep;
2548 struct cxgbi_hba *hba = NULL;
2549 struct cxgbi_sock *csk;
2550 int ifindex = 0;
2551 int err = -EINVAL;
2552
2553 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2554 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2555 shost, non_blocking, dst_addr);
2556
2557 if (shost) {
2558 hba = iscsi_host_priv(shost);
2559 if (!hba) {
2560 pr_info("shost 0x%p, priv NULL.\n", shost);
2561 goto err_out;
2562 }
2563
2564 ifindex = hba->ndev->ifindex;
2565 }
2566
2567 if (dst_addr->sa_family == AF_INET) {
2568 csk = cxgbi_check_route(dst_addr, ifindex);
2569 #if IS_ENABLED(CONFIG_IPV6)
2570 } else if (dst_addr->sa_family == AF_INET6) {
2571 csk = cxgbi_check_route6(dst_addr, ifindex);
2572 #endif
2573 } else {
2574 pr_info("address family 0x%x NOT supported.\n",
2575 dst_addr->sa_family);
2576 err = -EAFNOSUPPORT;
2577 return (struct iscsi_endpoint *)ERR_PTR(err);
2578 }
2579
2580 if (IS_ERR(csk))
2581 return (struct iscsi_endpoint *)csk;
2582 cxgbi_sock_get(csk);
2583
2584 if (!hba)
2585 hba = csk->cdev->hbas[csk->port_id];
2586 else if (hba != csk->cdev->hbas[csk->port_id]) {
2587 pr_info("Could not connect through requested host %u"
2588 "hba 0x%p != 0x%p (%u).\n",
2589 shost->host_no, hba,
2590 csk->cdev->hbas[csk->port_id], csk->port_id);
2591 err = -ENOSPC;
2592 goto release_conn;
2593 }
2594
2595 err = sock_get_port(csk);
2596 if (err)
2597 goto release_conn;
2598
2599 cxgbi_sock_set_state(csk, CTP_CONNECTING);
2600 err = csk->cdev->csk_init_act_open(csk);
2601 if (err)
2602 goto release_conn;
2603
2604 if (cxgbi_sock_is_closing(csk)) {
2605 err = -ENOSPC;
2606 pr_info("csk 0x%p is closing.\n", csk);
2607 goto release_conn;
2608 }
2609
2610 ep = iscsi_create_endpoint(sizeof(*cep));
2611 if (!ep) {
2612 err = -ENOMEM;
2613 pr_info("iscsi alloc ep, OOM.\n");
2614 goto release_conn;
2615 }
2616
2617 cep = ep->dd_data;
2618 cep->csk = csk;
2619 cep->chba = hba;
2620
2621 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2622 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2623 ep, cep, csk, hba, hba->ndev->name);
2624 return ep;
2625
2626 release_conn:
2627 cxgbi_sock_put(csk);
2628 cxgbi_sock_closed(csk);
2629 err_out:
2630 return ERR_PTR(err);
2631 }
2632 EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2633
cxgbi_ep_poll(struct iscsi_endpoint * ep,int timeout_ms)2634 int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2635 {
2636 struct cxgbi_endpoint *cep = ep->dd_data;
2637 struct cxgbi_sock *csk = cep->csk;
2638
2639 if (!cxgbi_sock_is_established(csk))
2640 return 0;
2641 return 1;
2642 }
2643 EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2644
cxgbi_ep_disconnect(struct iscsi_endpoint * ep)2645 void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2646 {
2647 struct cxgbi_endpoint *cep = ep->dd_data;
2648 struct cxgbi_conn *cconn = cep->cconn;
2649 struct cxgbi_sock *csk = cep->csk;
2650
2651 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2652 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2653 ep, cep, cconn, csk, csk->state, csk->flags);
2654
2655 if (cconn && cconn->iconn) {
2656 iscsi_suspend_tx(cconn->iconn);
2657 write_lock_bh(&csk->callback_lock);
2658 cep->csk->user_data = NULL;
2659 cconn->cep = NULL;
2660 write_unlock_bh(&csk->callback_lock);
2661 }
2662 iscsi_destroy_endpoint(ep);
2663
2664 if (likely(csk->state >= CTP_ESTABLISHED))
2665 need_active_close(csk);
2666 else
2667 cxgbi_sock_closed(csk);
2668
2669 cxgbi_sock_put(csk);
2670 }
2671 EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2672
cxgbi_iscsi_init(struct iscsi_transport * itp,struct scsi_transport_template ** stt)2673 int cxgbi_iscsi_init(struct iscsi_transport *itp,
2674 struct scsi_transport_template **stt)
2675 {
2676 *stt = iscsi_register_transport(itp);
2677 if (*stt == NULL) {
2678 pr_err("unable to register %s transport 0x%p.\n",
2679 itp->name, itp);
2680 return -ENODEV;
2681 }
2682 log_debug(1 << CXGBI_DBG_ISCSI,
2683 "%s, registered iscsi transport 0x%p.\n",
2684 itp->name, stt);
2685 return 0;
2686 }
2687 EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2688
cxgbi_iscsi_cleanup(struct iscsi_transport * itp,struct scsi_transport_template ** stt)2689 void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2690 struct scsi_transport_template **stt)
2691 {
2692 if (*stt) {
2693 log_debug(1 << CXGBI_DBG_ISCSI,
2694 "de-register transport 0x%p, %s, stt 0x%p.\n",
2695 itp, itp->name, *stt);
2696 *stt = NULL;
2697 iscsi_unregister_transport(itp);
2698 }
2699 }
2700 EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2701
cxgbi_attr_is_visible(int param_type,int param)2702 umode_t cxgbi_attr_is_visible(int param_type, int param)
2703 {
2704 switch (param_type) {
2705 case ISCSI_HOST_PARAM:
2706 switch (param) {
2707 case ISCSI_HOST_PARAM_NETDEV_NAME:
2708 case ISCSI_HOST_PARAM_HWADDRESS:
2709 case ISCSI_HOST_PARAM_IPADDRESS:
2710 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2711 return S_IRUGO;
2712 default:
2713 return 0;
2714 }
2715 case ISCSI_PARAM:
2716 switch (param) {
2717 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2718 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2719 case ISCSI_PARAM_HDRDGST_EN:
2720 case ISCSI_PARAM_DATADGST_EN:
2721 case ISCSI_PARAM_CONN_ADDRESS:
2722 case ISCSI_PARAM_CONN_PORT:
2723 case ISCSI_PARAM_EXP_STATSN:
2724 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2725 case ISCSI_PARAM_PERSISTENT_PORT:
2726 case ISCSI_PARAM_PING_TMO:
2727 case ISCSI_PARAM_RECV_TMO:
2728 case ISCSI_PARAM_INITIAL_R2T_EN:
2729 case ISCSI_PARAM_MAX_R2T:
2730 case ISCSI_PARAM_IMM_DATA_EN:
2731 case ISCSI_PARAM_FIRST_BURST:
2732 case ISCSI_PARAM_MAX_BURST:
2733 case ISCSI_PARAM_PDU_INORDER_EN:
2734 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2735 case ISCSI_PARAM_ERL:
2736 case ISCSI_PARAM_TARGET_NAME:
2737 case ISCSI_PARAM_TPGT:
2738 case ISCSI_PARAM_USERNAME:
2739 case ISCSI_PARAM_PASSWORD:
2740 case ISCSI_PARAM_USERNAME_IN:
2741 case ISCSI_PARAM_PASSWORD_IN:
2742 case ISCSI_PARAM_FAST_ABORT:
2743 case ISCSI_PARAM_ABORT_TMO:
2744 case ISCSI_PARAM_LU_RESET_TMO:
2745 case ISCSI_PARAM_TGT_RESET_TMO:
2746 case ISCSI_PARAM_IFACE_NAME:
2747 case ISCSI_PARAM_INITIATOR_NAME:
2748 return S_IRUGO;
2749 default:
2750 return 0;
2751 }
2752 }
2753
2754 return 0;
2755 }
2756 EXPORT_SYMBOL_GPL(cxgbi_attr_is_visible);
2757
libcxgbi_init_module(void)2758 static int __init libcxgbi_init_module(void)
2759 {
2760 pr_info("%s", version);
2761
2762 BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, cb) <
2763 sizeof(struct cxgbi_skb_cb));
2764 return 0;
2765 }
2766
libcxgbi_exit_module(void)2767 static void __exit libcxgbi_exit_module(void)
2768 {
2769 cxgbi_device_unregister_all(0xFF);
2770 return;
2771 }
2772
2773 module_init(libcxgbi_init_module);
2774 module_exit(libcxgbi_exit_module);
2775