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 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
find_route_ipv4(struct flowi4 * fl4,__be32 saddr,__be32 daddr,__be16 sport,__be16 dport,u8 tos,int ifindex)588 static 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
603 static struct cxgbi_sock *
cxgbi_check_route(struct sockaddr * dst_addr,int ifindex)604 cxgbi_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 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
663 &daddr->sin_addr.s_addr, ndev->name);
664 err = -ENETUNREACH;
665 goto rel_neigh;
666 }
667 log_debug(1 << CXGBI_DBG_SOCK,
668 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
669 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
670 port, ndev->name, cdev);
671
672 csk = cxgbi_sock_create(cdev);
673 if (!csk) {
674 err = -ENOMEM;
675 goto rel_neigh;
676 }
677 csk->cdev = cdev;
678 csk->port_id = port;
679 csk->mtu = mtu;
680 csk->dst = dst;
681
682 csk->csk_family = AF_INET;
683 csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
684 csk->daddr.sin_port = daddr->sin_port;
685 csk->daddr.sin_family = daddr->sin_family;
686 csk->saddr.sin_family = daddr->sin_family;
687 csk->saddr.sin_addr.s_addr = fl4.saddr;
688 neigh_release(n);
689
690 return csk;
691
692 rel_neigh:
693 neigh_release(n);
694
695 rel_rt:
696 ip_rt_put(rt);
697 err_out:
698 return ERR_PTR(err);
699 }
700
701 #if IS_ENABLED(CONFIG_IPV6)
find_route_ipv6(const struct in6_addr * saddr,const struct in6_addr * daddr,int ifindex)702 static struct rt6_info *find_route_ipv6(const struct in6_addr *saddr,
703 const struct in6_addr *daddr,
704 int ifindex)
705 {
706 struct flowi6 fl;
707
708 memset(&fl, 0, sizeof(fl));
709 fl.flowi6_oif = ifindex;
710 if (saddr)
711 memcpy(&fl.saddr, saddr, sizeof(struct in6_addr));
712 if (daddr)
713 memcpy(&fl.daddr, daddr, sizeof(struct in6_addr));
714 return (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl);
715 }
716
717 static struct cxgbi_sock *
cxgbi_check_route6(struct sockaddr * dst_addr,int ifindex)718 cxgbi_check_route6(struct sockaddr *dst_addr, int ifindex)
719 {
720 struct sockaddr_in6 *daddr6 = (struct sockaddr_in6 *)dst_addr;
721 struct dst_entry *dst;
722 struct net_device *ndev;
723 struct cxgbi_device *cdev;
724 struct rt6_info *rt = NULL;
725 struct neighbour *n;
726 struct in6_addr pref_saddr;
727 struct cxgbi_sock *csk = NULL;
728 unsigned int mtu = 0;
729 int port = 0xFFFF;
730 int err = 0;
731
732 rt = find_route_ipv6(NULL, &daddr6->sin6_addr, ifindex);
733
734 if (!rt) {
735 pr_info("no route to ipv6 %pI6 port %u\n",
736 daddr6->sin6_addr.s6_addr,
737 be16_to_cpu(daddr6->sin6_port));
738 err = -ENETUNREACH;
739 goto err_out;
740 }
741
742 dst = &rt->dst;
743
744 n = dst_neigh_lookup(dst, &daddr6->sin6_addr);
745
746 if (!n) {
747 pr_info("%pI6, port %u, dst no neighbour.\n",
748 daddr6->sin6_addr.s6_addr,
749 be16_to_cpu(daddr6->sin6_port));
750 err = -ENETUNREACH;
751 goto rel_rt;
752 }
753 ndev = n->dev;
754
755 if (!(ndev->flags & IFF_UP) || !netif_carrier_ok(ndev)) {
756 pr_info("%s interface not up.\n", ndev->name);
757 err = -ENETDOWN;
758 goto rel_rt;
759 }
760
761 if (ipv6_addr_is_multicast(&daddr6->sin6_addr)) {
762 pr_info("multi-cast route %pI6 port %u, dev %s.\n",
763 daddr6->sin6_addr.s6_addr,
764 ntohs(daddr6->sin6_port), ndev->name);
765 err = -ENETUNREACH;
766 goto rel_rt;
767 }
768
769 cdev = cxgbi_device_find_by_netdev(ndev, &port);
770 if (!cdev)
771 cdev = cxgbi_device_find_by_mac(ndev, &port);
772 if (!cdev) {
773 pr_info("dst %pI6 %s, NOT cxgbi device.\n",
774 daddr6->sin6_addr.s6_addr, ndev->name);
775 err = -ENETUNREACH;
776 goto rel_rt;
777 }
778 log_debug(1 << CXGBI_DBG_SOCK,
779 "route to %pI6 :%u, ndev p#%d,%s, cdev 0x%p.\n",
780 daddr6->sin6_addr.s6_addr, ntohs(daddr6->sin6_port), port,
781 ndev->name, cdev);
782
783 csk = cxgbi_sock_create(cdev);
784 if (!csk) {
785 err = -ENOMEM;
786 goto rel_rt;
787 }
788 csk->cdev = cdev;
789 csk->port_id = port;
790 csk->mtu = mtu;
791 csk->dst = dst;
792
793 if (ipv6_addr_any(&rt->rt6i_prefsrc.addr)) {
794 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry *)rt);
795
796 err = ipv6_dev_get_saddr(&init_net, idev ? idev->dev : NULL,
797 &daddr6->sin6_addr, 0, &pref_saddr);
798 if (err) {
799 pr_info("failed to get source address to reach %pI6\n",
800 &daddr6->sin6_addr);
801 goto rel_rt;
802 }
803 } else {
804 pref_saddr = rt->rt6i_prefsrc.addr;
805 }
806
807 csk->csk_family = AF_INET6;
808 csk->daddr6.sin6_addr = daddr6->sin6_addr;
809 csk->daddr6.sin6_port = daddr6->sin6_port;
810 csk->daddr6.sin6_family = daddr6->sin6_family;
811 csk->saddr6.sin6_family = daddr6->sin6_family;
812 csk->saddr6.sin6_addr = pref_saddr;
813
814 neigh_release(n);
815 return csk;
816
817 rel_rt:
818 if (n)
819 neigh_release(n);
820
821 ip6_rt_put(rt);
822 if (csk)
823 cxgbi_sock_closed(csk);
824 err_out:
825 return ERR_PTR(err);
826 }
827 #endif /* IS_ENABLED(CONFIG_IPV6) */
828
cxgbi_sock_established(struct cxgbi_sock * csk,unsigned int snd_isn,unsigned int opt)829 void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
830 unsigned int opt)
831 {
832 csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
833 dst_confirm(csk->dst);
834 smp_mb();
835 cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
836 }
837 EXPORT_SYMBOL_GPL(cxgbi_sock_established);
838
cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock * csk)839 static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
840 {
841 log_debug(1 << CXGBI_DBG_SOCK,
842 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
843 csk, csk->state, csk->flags, csk->user_data);
844
845 if (csk->state != CTP_ESTABLISHED) {
846 read_lock_bh(&csk->callback_lock);
847 if (csk->user_data)
848 iscsi_conn_failure(csk->user_data,
849 ISCSI_ERR_TCP_CONN_CLOSE);
850 read_unlock_bh(&csk->callback_lock);
851 }
852 }
853
cxgbi_sock_closed(struct cxgbi_sock * csk)854 void cxgbi_sock_closed(struct cxgbi_sock *csk)
855 {
856 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
857 csk, (csk)->state, (csk)->flags, (csk)->tid);
858 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
859 if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
860 return;
861 if (csk->saddr.sin_port)
862 sock_put_port(csk);
863 if (csk->dst)
864 dst_release(csk->dst);
865 csk->cdev->csk_release_offload_resources(csk);
866 cxgbi_sock_set_state(csk, CTP_CLOSED);
867 cxgbi_inform_iscsi_conn_closing(csk);
868 cxgbi_sock_put(csk);
869 }
870 EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
871
need_active_close(struct cxgbi_sock * csk)872 static void need_active_close(struct cxgbi_sock *csk)
873 {
874 int data_lost;
875 int close_req = 0;
876
877 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
878 csk, (csk)->state, (csk)->flags, (csk)->tid);
879 spin_lock_bh(&csk->lock);
880 if (csk->dst)
881 dst_confirm(csk->dst);
882 data_lost = skb_queue_len(&csk->receive_queue);
883 __skb_queue_purge(&csk->receive_queue);
884
885 if (csk->state == CTP_ACTIVE_OPEN)
886 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
887 else if (csk->state == CTP_ESTABLISHED) {
888 close_req = 1;
889 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
890 } else if (csk->state == CTP_PASSIVE_CLOSE) {
891 close_req = 1;
892 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
893 }
894
895 if (close_req) {
896 if (!cxgbi_sock_flag(csk, CTPF_LOGOUT_RSP_RCVD) ||
897 data_lost)
898 csk->cdev->csk_send_abort_req(csk);
899 else
900 csk->cdev->csk_send_close_req(csk);
901 }
902
903 spin_unlock_bh(&csk->lock);
904 }
905
cxgbi_sock_fail_act_open(struct cxgbi_sock * csk,int errno)906 void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
907 {
908 pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
909 csk, csk->state, csk->flags,
910 &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
911 &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
912 errno);
913
914 cxgbi_sock_set_state(csk, CTP_CONNECTING);
915 csk->err = errno;
916 cxgbi_sock_closed(csk);
917 }
918 EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
919
cxgbi_sock_act_open_req_arp_failure(void * handle,struct sk_buff * skb)920 void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
921 {
922 struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
923 struct module *owner = csk->cdev->owner;
924
925 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
926 csk, (csk)->state, (csk)->flags, (csk)->tid);
927 cxgbi_sock_get(csk);
928 spin_lock_bh(&csk->lock);
929 if (csk->state == CTP_ACTIVE_OPEN)
930 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
931 spin_unlock_bh(&csk->lock);
932 cxgbi_sock_put(csk);
933 __kfree_skb(skb);
934
935 module_put(owner);
936 }
937 EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
938
cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock * csk)939 void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
940 {
941 cxgbi_sock_get(csk);
942 spin_lock_bh(&csk->lock);
943
944 cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
945 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
946 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
947 if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
948 pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
949 csk, csk->state, csk->flags, csk->tid);
950 cxgbi_sock_closed(csk);
951 }
952
953 spin_unlock_bh(&csk->lock);
954 cxgbi_sock_put(csk);
955 }
956 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
957
cxgbi_sock_rcv_peer_close(struct cxgbi_sock * csk)958 void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
959 {
960 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
961 csk, (csk)->state, (csk)->flags, (csk)->tid);
962 cxgbi_sock_get(csk);
963 spin_lock_bh(&csk->lock);
964
965 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
966 goto done;
967
968 switch (csk->state) {
969 case CTP_ESTABLISHED:
970 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
971 break;
972 case CTP_ACTIVE_CLOSE:
973 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
974 break;
975 case CTP_CLOSE_WAIT_1:
976 cxgbi_sock_closed(csk);
977 break;
978 case CTP_ABORTING:
979 break;
980 default:
981 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
982 csk, csk->state, csk->flags, csk->tid);
983 }
984 cxgbi_inform_iscsi_conn_closing(csk);
985 done:
986 spin_unlock_bh(&csk->lock);
987 cxgbi_sock_put(csk);
988 }
989 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
990
cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock * csk,u32 snd_nxt)991 void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
992 {
993 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
994 csk, (csk)->state, (csk)->flags, (csk)->tid);
995 cxgbi_sock_get(csk);
996 spin_lock_bh(&csk->lock);
997
998 csk->snd_una = snd_nxt - 1;
999 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
1000 goto done;
1001
1002 switch (csk->state) {
1003 case CTP_ACTIVE_CLOSE:
1004 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
1005 break;
1006 case CTP_CLOSE_WAIT_1:
1007 case CTP_CLOSE_WAIT_2:
1008 cxgbi_sock_closed(csk);
1009 break;
1010 case CTP_ABORTING:
1011 break;
1012 default:
1013 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
1014 csk, csk->state, csk->flags, csk->tid);
1015 }
1016 done:
1017 spin_unlock_bh(&csk->lock);
1018 cxgbi_sock_put(csk);
1019 }
1020 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
1021
cxgbi_sock_rcv_wr_ack(struct cxgbi_sock * csk,unsigned int credits,unsigned int snd_una,int seq_chk)1022 void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
1023 unsigned int snd_una, int seq_chk)
1024 {
1025 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1026 "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
1027 csk, csk->state, csk->flags, csk->tid, credits,
1028 csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
1029
1030 spin_lock_bh(&csk->lock);
1031
1032 csk->wr_cred += credits;
1033 if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
1034 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
1035
1036 while (credits) {
1037 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
1038
1039 if (unlikely(!p)) {
1040 pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
1041 csk, csk->state, csk->flags, csk->tid, credits,
1042 csk->wr_cred, csk->wr_una_cred);
1043 break;
1044 }
1045
1046 if (unlikely(credits < p->csum)) {
1047 pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
1048 csk, csk->state, csk->flags, csk->tid,
1049 credits, csk->wr_cred, csk->wr_una_cred,
1050 p->csum);
1051 p->csum -= credits;
1052 break;
1053 } else {
1054 cxgbi_sock_dequeue_wr(csk);
1055 credits -= p->csum;
1056 kfree_skb(p);
1057 }
1058 }
1059
1060 cxgbi_sock_check_wr_invariants(csk);
1061
1062 if (seq_chk) {
1063 if (unlikely(before(snd_una, csk->snd_una))) {
1064 pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
1065 csk, csk->state, csk->flags, csk->tid, snd_una,
1066 csk->snd_una);
1067 goto done;
1068 }
1069
1070 if (csk->snd_una != snd_una) {
1071 csk->snd_una = snd_una;
1072 dst_confirm(csk->dst);
1073 }
1074 }
1075
1076 if (skb_queue_len(&csk->write_queue)) {
1077 if (csk->cdev->csk_push_tx_frames(csk, 0))
1078 cxgbi_conn_tx_open(csk);
1079 } else
1080 cxgbi_conn_tx_open(csk);
1081 done:
1082 spin_unlock_bh(&csk->lock);
1083 }
1084 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
1085
cxgbi_sock_find_best_mtu(struct cxgbi_sock * csk,unsigned short mtu)1086 static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
1087 unsigned short mtu)
1088 {
1089 int i = 0;
1090
1091 while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
1092 ++i;
1093
1094 return i;
1095 }
1096
cxgbi_sock_select_mss(struct cxgbi_sock * csk,unsigned int pmtu)1097 unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
1098 {
1099 unsigned int idx;
1100 struct dst_entry *dst = csk->dst;
1101
1102 csk->advmss = dst_metric_advmss(dst);
1103
1104 if (csk->advmss > pmtu - 40)
1105 csk->advmss = pmtu - 40;
1106 if (csk->advmss < csk->cdev->mtus[0] - 40)
1107 csk->advmss = csk->cdev->mtus[0] - 40;
1108 idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
1109
1110 return idx;
1111 }
1112 EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
1113
cxgbi_sock_skb_entail(struct cxgbi_sock * csk,struct sk_buff * skb)1114 void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
1115 {
1116 cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
1117 __skb_queue_tail(&csk->write_queue, skb);
1118 }
1119 EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
1120
cxgbi_sock_purge_wr_queue(struct cxgbi_sock * csk)1121 void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
1122 {
1123 struct sk_buff *skb;
1124
1125 while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
1126 kfree_skb(skb);
1127 }
1128 EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
1129
cxgbi_sock_check_wr_invariants(const struct cxgbi_sock * csk)1130 void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
1131 {
1132 int pending = cxgbi_sock_count_pending_wrs(csk);
1133
1134 if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
1135 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
1136 csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
1137 }
1138 EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
1139
cxgbi_sock_send_pdus(struct cxgbi_sock * csk,struct sk_buff * skb)1140 static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
1141 {
1142 struct cxgbi_device *cdev = csk->cdev;
1143 struct sk_buff *next;
1144 int err, copied = 0;
1145
1146 spin_lock_bh(&csk->lock);
1147
1148 if (csk->state != CTP_ESTABLISHED) {
1149 log_debug(1 << CXGBI_DBG_PDU_TX,
1150 "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
1151 csk, csk->state, csk->flags, csk->tid);
1152 err = -EAGAIN;
1153 goto out_err;
1154 }
1155
1156 if (csk->err) {
1157 log_debug(1 << CXGBI_DBG_PDU_TX,
1158 "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
1159 csk, csk->state, csk->flags, csk->tid, csk->err);
1160 err = -EPIPE;
1161 goto out_err;
1162 }
1163
1164 if (csk->write_seq - csk->snd_una >= csk->snd_win) {
1165 log_debug(1 << CXGBI_DBG_PDU_TX,
1166 "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
1167 csk, csk->state, csk->flags, csk->tid, csk->write_seq,
1168 csk->snd_una, csk->snd_win);
1169 err = -ENOBUFS;
1170 goto out_err;
1171 }
1172
1173 while (skb) {
1174 int frags = skb_shinfo(skb)->nr_frags +
1175 (skb->len != skb->data_len);
1176
1177 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
1178 pr_err("csk 0x%p, skb head %u < %u.\n",
1179 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
1180 err = -EINVAL;
1181 goto out_err;
1182 }
1183
1184 if (frags >= SKB_WR_LIST_SIZE) {
1185 pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
1186 csk, skb_shinfo(skb)->nr_frags, skb->len,
1187 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
1188 err = -EINVAL;
1189 goto out_err;
1190 }
1191
1192 next = skb->next;
1193 skb->next = NULL;
1194 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
1195 cxgbi_sock_skb_entail(csk, skb);
1196 copied += skb->len;
1197 csk->write_seq += skb->len +
1198 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
1199 skb = next;
1200 }
1201
1202 if (likely(skb_queue_len(&csk->write_queue)))
1203 cdev->csk_push_tx_frames(csk, 1);
1204 done:
1205 spin_unlock_bh(&csk->lock);
1206 return copied;
1207
1208 out_err:
1209 if (copied == 0 && err == -EPIPE)
1210 copied = csk->err ? csk->err : -EPIPE;
1211 else
1212 copied = err;
1213 goto done;
1214 }
1215
1216 static inline void
scmd_get_params(struct scsi_cmnd * sc,struct scatterlist ** sgl,unsigned int * sgcnt,unsigned int * dlen,unsigned int prot)1217 scmd_get_params(struct scsi_cmnd *sc, struct scatterlist **sgl,
1218 unsigned int *sgcnt, unsigned int *dlen,
1219 unsigned int prot)
1220 {
1221 struct scsi_data_buffer *sdb = prot ? scsi_prot(sc) : scsi_out(sc);
1222
1223 *sgl = sdb->table.sgl;
1224 *sgcnt = sdb->table.nents;
1225 *dlen = sdb->length;
1226 /* Caution: for protection sdb, sdb->length is invalid */
1227 }
1228
cxgbi_ddp_set_one_ppod(struct cxgbi_pagepod * ppod,struct cxgbi_task_tag_info * ttinfo,struct scatterlist ** sg_pp,unsigned int * sg_off)1229 void cxgbi_ddp_set_one_ppod(struct cxgbi_pagepod *ppod,
1230 struct cxgbi_task_tag_info *ttinfo,
1231 struct scatterlist **sg_pp, unsigned int *sg_off)
1232 {
1233 struct scatterlist *sg = sg_pp ? *sg_pp : NULL;
1234 unsigned int offset = sg_off ? *sg_off : 0;
1235 dma_addr_t addr = 0UL;
1236 unsigned int len = 0;
1237 int i;
1238
1239 memcpy(ppod, &ttinfo->hdr, sizeof(struct cxgbi_pagepod_hdr));
1240
1241 if (sg) {
1242 addr = sg_dma_address(sg);
1243 len = sg_dma_len(sg);
1244 }
1245
1246 for (i = 0; i < PPOD_PAGES_MAX; i++) {
1247 if (sg) {
1248 ppod->addr[i] = cpu_to_be64(addr + offset);
1249 offset += PAGE_SIZE;
1250 if (offset == (len + sg->offset)) {
1251 offset = 0;
1252 sg = sg_next(sg);
1253 if (sg) {
1254 addr = sg_dma_address(sg);
1255 len = sg_dma_len(sg);
1256 }
1257 }
1258 } else {
1259 ppod->addr[i] = 0ULL;
1260 }
1261 }
1262
1263 /*
1264 * the fifth address needs to be repeated in the next ppod, so do
1265 * not move sg
1266 */
1267 if (sg_pp) {
1268 *sg_pp = sg;
1269 *sg_off = offset;
1270 }
1271
1272 if (offset == len) {
1273 offset = 0;
1274 sg = sg_next(sg);
1275 if (sg) {
1276 addr = sg_dma_address(sg);
1277 len = sg_dma_len(sg);
1278 }
1279 }
1280 ppod->addr[i] = sg ? cpu_to_be64(addr + offset) : 0ULL;
1281 }
1282 EXPORT_SYMBOL_GPL(cxgbi_ddp_set_one_ppod);
1283
1284 /*
1285 * APIs interacting with open-iscsi libraries
1286 */
1287
1288 static unsigned char padding[4];
1289
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)1290 void cxgbi_ddp_ppm_setup(void **ppm_pp, struct cxgbi_device *cdev,
1291 struct cxgbi_tag_format *tformat, unsigned int ppmax,
1292 unsigned int llimit, unsigned int start,
1293 unsigned int rsvd_factor)
1294 {
1295 int err = cxgbi_ppm_init(ppm_pp, cdev->ports[0], cdev->pdev,
1296 cdev->lldev, tformat, ppmax, llimit, start,
1297 rsvd_factor);
1298
1299 if (err >= 0) {
1300 struct cxgbi_ppm *ppm = (struct cxgbi_ppm *)(*ppm_pp);
1301
1302 if (ppm->ppmax < 1024 ||
1303 ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX)
1304 cdev->flags |= CXGBI_FLAG_DDP_OFF;
1305 err = 0;
1306 } else {
1307 cdev->flags |= CXGBI_FLAG_DDP_OFF;
1308 }
1309 }
1310 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppm_setup);
1311
cxgbi_ddp_sgl_check(struct scatterlist * sgl,int nents)1312 static int cxgbi_ddp_sgl_check(struct scatterlist *sgl, int nents)
1313 {
1314 int i;
1315 int last_sgidx = nents - 1;
1316 struct scatterlist *sg = sgl;
1317
1318 for (i = 0; i < nents; i++, sg = sg_next(sg)) {
1319 unsigned int len = sg->length + sg->offset;
1320
1321 if ((sg->offset & 0x3) || (i && sg->offset) ||
1322 ((i != last_sgidx) && len != PAGE_SIZE)) {
1323 log_debug(1 << CXGBI_DBG_DDP,
1324 "sg %u/%u, %u,%u, not aligned.\n",
1325 i, nents, sg->offset, sg->length);
1326 goto err_out;
1327 }
1328 }
1329 return 0;
1330 err_out:
1331 return -EINVAL;
1332 }
1333
cxgbi_ddp_reserve(struct cxgbi_conn * cconn,struct cxgbi_task_data * tdata,u32 sw_tag,unsigned int xferlen)1334 static int cxgbi_ddp_reserve(struct cxgbi_conn *cconn,
1335 struct cxgbi_task_data *tdata, u32 sw_tag,
1336 unsigned int xferlen)
1337 {
1338 struct cxgbi_sock *csk = cconn->cep->csk;
1339 struct cxgbi_device *cdev = csk->cdev;
1340 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1341 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1342 struct scatterlist *sgl = ttinfo->sgl;
1343 unsigned int sgcnt = ttinfo->nents;
1344 unsigned int sg_offset = sgl->offset;
1345 int err;
1346
1347 if (cdev->flags & CXGBI_FLAG_DDP_OFF) {
1348 log_debug(1 << CXGBI_DBG_DDP,
1349 "cdev 0x%p DDP off.\n", cdev);
1350 return -EINVAL;
1351 }
1352
1353 if (!ppm || xferlen < DDP_THRESHOLD || !sgcnt ||
1354 ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX) {
1355 log_debug(1 << CXGBI_DBG_DDP,
1356 "ppm 0x%p, pgidx %u, xfer %u, sgcnt %u, NO ddp.\n",
1357 ppm, ppm ? ppm->tformat.pgsz_idx_dflt : DDP_PGIDX_MAX,
1358 xferlen, ttinfo->nents);
1359 return -EINVAL;
1360 }
1361
1362 /* make sure the buffer is suitable for ddp */
1363 if (cxgbi_ddp_sgl_check(sgl, sgcnt) < 0)
1364 return -EINVAL;
1365
1366 ttinfo->nr_pages = (xferlen + sgl->offset + (1 << PAGE_SHIFT) - 1) >>
1367 PAGE_SHIFT;
1368
1369 /*
1370 * the ddp tag will be used for the itt in the outgoing pdu,
1371 * the itt genrated by libiscsi is saved in the ppm and can be
1372 * retrieved via the ddp tag
1373 */
1374 err = cxgbi_ppm_ppods_reserve(ppm, ttinfo->nr_pages, 0, &ttinfo->idx,
1375 &ttinfo->tag, (unsigned long)sw_tag);
1376 if (err < 0) {
1377 cconn->ddp_full++;
1378 return err;
1379 }
1380 ttinfo->npods = err;
1381
1382 /* setup dma from scsi command sgl */
1383 sgl->offset = 0;
1384 err = dma_map_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1385 sgl->offset = sg_offset;
1386 if (err == 0) {
1387 pr_info("%s: 0x%x, xfer %u, sgl %u dma mapping err.\n",
1388 __func__, sw_tag, xferlen, sgcnt);
1389 goto rel_ppods;
1390 }
1391 if (err != ttinfo->nr_pages) {
1392 log_debug(1 << CXGBI_DBG_DDP,
1393 "%s: sw tag 0x%x, xfer %u, sgl %u, dma count %d.\n",
1394 __func__, sw_tag, xferlen, sgcnt, err);
1395 }
1396
1397 ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_MAPPED;
1398 ttinfo->cid = csk->port_id;
1399
1400 cxgbi_ppm_make_ppod_hdr(ppm, ttinfo->tag, csk->tid, sgl->offset,
1401 xferlen, &ttinfo->hdr);
1402
1403 if (cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ) {
1404 /* write ppod from xmit_pdu (of iscsi_scsi_command pdu) */
1405 ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_VALID;
1406 } else {
1407 /* write ppod from control queue now */
1408 err = cdev->csk_ddp_set_map(ppm, csk, ttinfo);
1409 if (err < 0)
1410 goto rel_ppods;
1411 }
1412
1413 return 0;
1414
1415 rel_ppods:
1416 cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1417
1418 if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_MAPPED) {
1419 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_MAPPED;
1420 dma_unmap_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1421 }
1422 return -EINVAL;
1423 }
1424
task_release_itt(struct iscsi_task * task,itt_t hdr_itt)1425 static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1426 {
1427 struct scsi_cmnd *sc = task->sc;
1428 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1429 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1430 struct cxgbi_device *cdev = cconn->chba->cdev;
1431 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1432 u32 tag = ntohl((__force u32)hdr_itt);
1433
1434 log_debug(1 << CXGBI_DBG_DDP,
1435 "cdev 0x%p, task 0x%p, release tag 0x%x.\n",
1436 cdev, task, tag);
1437 if (sc &&
1438 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
1439 cxgbi_ppm_is_ddp_tag(ppm, tag)) {
1440 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1441 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1442
1443 if (!(cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ))
1444 cdev->csk_ddp_clear_map(cdev, ppm, ttinfo);
1445 cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1446 dma_unmap_sg(&ppm->pdev->dev, ttinfo->sgl, ttinfo->nents,
1447 DMA_FROM_DEVICE);
1448 }
1449 }
1450
cxgbi_build_sw_tag(u32 idx,u32 age)1451 static inline u32 cxgbi_build_sw_tag(u32 idx, u32 age)
1452 {
1453 /* assume idx and age both are < 0x7FFF (32767) */
1454 return (idx << 16) | age;
1455 }
1456
task_reserve_itt(struct iscsi_task * task,itt_t * hdr_itt)1457 static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1458 {
1459 struct scsi_cmnd *sc = task->sc;
1460 struct iscsi_conn *conn = task->conn;
1461 struct iscsi_session *sess = conn->session;
1462 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1463 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1464 struct cxgbi_device *cdev = cconn->chba->cdev;
1465 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1466 u32 sw_tag = cxgbi_build_sw_tag(task->itt, sess->age);
1467 u32 tag = 0;
1468 int err = -EINVAL;
1469
1470 if (sc &&
1471 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)
1472 ) {
1473 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1474 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1475
1476 scmd_get_params(sc, &ttinfo->sgl, &ttinfo->nents,
1477 &tdata->dlen, 0);
1478 err = cxgbi_ddp_reserve(cconn, tdata, sw_tag, tdata->dlen);
1479 if (!err)
1480 tag = ttinfo->tag;
1481 else
1482 log_debug(1 << CXGBI_DBG_DDP,
1483 "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1484 cconn->cep->csk, task, tdata->dlen,
1485 ttinfo->nents);
1486 }
1487
1488 if (err < 0) {
1489 err = cxgbi_ppm_make_non_ddp_tag(ppm, sw_tag, &tag);
1490 if (err < 0)
1491 return err;
1492 }
1493 /* the itt need to sent in big-endian order */
1494 *hdr_itt = (__force itt_t)htonl(tag);
1495
1496 log_debug(1 << CXGBI_DBG_DDP,
1497 "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1498 cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1499 return 0;
1500 }
1501
cxgbi_parse_pdu_itt(struct iscsi_conn * conn,itt_t itt,int * idx,int * age)1502 void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1503 {
1504 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1505 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1506 struct cxgbi_device *cdev = cconn->chba->cdev;
1507 struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1508 u32 tag = ntohl((__force u32)itt);
1509 u32 sw_bits;
1510
1511 if (ppm) {
1512 if (cxgbi_ppm_is_ddp_tag(ppm, tag))
1513 sw_bits = cxgbi_ppm_get_tag_caller_data(ppm, tag);
1514 else
1515 sw_bits = cxgbi_ppm_decode_non_ddp_tag(ppm, tag);
1516 } else {
1517 sw_bits = tag;
1518 }
1519
1520 cxgbi_decode_sw_tag(sw_bits, idx, age);
1521 log_debug(1 << CXGBI_DBG_DDP,
1522 "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1523 cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1524 age ? *age : 0xFF);
1525 }
1526 EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1527
cxgbi_conn_tx_open(struct cxgbi_sock * csk)1528 void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1529 {
1530 struct iscsi_conn *conn = csk->user_data;
1531
1532 if (conn) {
1533 log_debug(1 << CXGBI_DBG_SOCK,
1534 "csk 0x%p, cid %d.\n", csk, conn->id);
1535 iscsi_conn_queue_work(conn);
1536 }
1537 }
1538 EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1539
1540 /*
1541 * pdu receive, interact with libiscsi_tcp
1542 */
read_pdu_skb(struct iscsi_conn * conn,struct sk_buff * skb,unsigned int offset,int offloaded)1543 static inline int read_pdu_skb(struct iscsi_conn *conn,
1544 struct sk_buff *skb,
1545 unsigned int offset,
1546 int offloaded)
1547 {
1548 int status = 0;
1549 int bytes_read;
1550
1551 bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1552 switch (status) {
1553 case ISCSI_TCP_CONN_ERR:
1554 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1555 skb, offset, offloaded);
1556 return -EIO;
1557 case ISCSI_TCP_SUSPENDED:
1558 log_debug(1 << CXGBI_DBG_PDU_RX,
1559 "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1560 skb, offset, offloaded, bytes_read);
1561 /* no transfer - just have caller flush queue */
1562 return bytes_read;
1563 case ISCSI_TCP_SKB_DONE:
1564 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1565 skb, offset, offloaded);
1566 /*
1567 * pdus should always fit in the skb and we should get
1568 * segment done notifcation.
1569 */
1570 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1571 return -EFAULT;
1572 case ISCSI_TCP_SEGMENT_DONE:
1573 log_debug(1 << CXGBI_DBG_PDU_RX,
1574 "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1575 skb, offset, offloaded, bytes_read);
1576 return bytes_read;
1577 default:
1578 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1579 skb, offset, offloaded, status);
1580 return -EINVAL;
1581 }
1582 }
1583
1584 static int
skb_read_pdu_bhs(struct cxgbi_sock * csk,struct iscsi_conn * conn,struct sk_buff * skb)1585 skb_read_pdu_bhs(struct cxgbi_sock *csk, struct iscsi_conn *conn,
1586 struct sk_buff *skb)
1587 {
1588 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1589 int err;
1590
1591 log_debug(1 << CXGBI_DBG_PDU_RX,
1592 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1593 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1594
1595 if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1596 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1597 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1598 return -EIO;
1599 }
1600
1601 if (conn->hdrdgst_en &&
1602 cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1603 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1604 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1605 return -EIO;
1606 }
1607
1608 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_ISCSI_COMPL) &&
1609 cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA_DDPD)) {
1610 /* If completion flag is set and data is directly
1611 * placed in to the host memory then update
1612 * task->exp_datasn to the datasn in completion
1613 * iSCSI hdr as T6 adapter generates completion only
1614 * for the last pdu of a sequence.
1615 */
1616 itt_t itt = ((struct iscsi_data *)skb->data)->itt;
1617 struct iscsi_task *task = iscsi_itt_to_ctask(conn, itt);
1618 u32 data_sn = be32_to_cpu(((struct iscsi_data *)
1619 skb->data)->datasn);
1620 if (task && task->sc) {
1621 struct iscsi_tcp_task *tcp_task = task->dd_data;
1622
1623 tcp_task->exp_datasn = data_sn;
1624 }
1625 }
1626
1627 err = read_pdu_skb(conn, skb, 0, 0);
1628 if (likely(err >= 0)) {
1629 struct iscsi_hdr *hdr = (struct iscsi_hdr *)skb->data;
1630 u8 opcode = hdr->opcode & ISCSI_OPCODE_MASK;
1631
1632 if (unlikely(opcode == ISCSI_OP_LOGOUT_RSP))
1633 cxgbi_sock_set_flag(csk, CTPF_LOGOUT_RSP_RCVD);
1634 }
1635
1636 return err;
1637 }
1638
skb_read_pdu_data(struct iscsi_conn * conn,struct sk_buff * lskb,struct sk_buff * skb,unsigned int offset)1639 static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1640 struct sk_buff *skb, unsigned int offset)
1641 {
1642 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1643 bool offloaded = 0;
1644 int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1645
1646 log_debug(1 << CXGBI_DBG_PDU_RX,
1647 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1648 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1649
1650 if (conn->datadgst_en &&
1651 cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1652 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1653 conn, lskb, cxgbi_skcb_flags(lskb));
1654 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1655 return -EIO;
1656 }
1657
1658 if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1659 return 0;
1660
1661 /* coalesced, add header digest length */
1662 if (lskb == skb && conn->hdrdgst_en)
1663 offset += ISCSI_DIGEST_SIZE;
1664
1665 if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1666 offloaded = 1;
1667
1668 if (opcode == ISCSI_OP_SCSI_DATA_IN)
1669 log_debug(1 << CXGBI_DBG_PDU_RX,
1670 "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1671 skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1672 tcp_conn->in.datalen, offloaded ? "is" : "not");
1673
1674 return read_pdu_skb(conn, skb, offset, offloaded);
1675 }
1676
csk_return_rx_credits(struct cxgbi_sock * csk,int copied)1677 static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1678 {
1679 struct cxgbi_device *cdev = csk->cdev;
1680 int must_send;
1681 u32 credits;
1682
1683 log_debug(1 << CXGBI_DBG_PDU_RX,
1684 "csk 0x%p,%u,0x%lx,%u, seq %u, wup %u, thre %u, %u.\n",
1685 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1686 csk->rcv_wup, cdev->rx_credit_thres,
1687 csk->rcv_win);
1688
1689 if (!cdev->rx_credit_thres)
1690 return;
1691
1692 if (csk->state != CTP_ESTABLISHED)
1693 return;
1694
1695 credits = csk->copied_seq - csk->rcv_wup;
1696 if (unlikely(!credits))
1697 return;
1698 must_send = credits + 16384 >= csk->rcv_win;
1699 if (must_send || credits >= cdev->rx_credit_thres)
1700 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1701 }
1702
cxgbi_conn_pdu_ready(struct cxgbi_sock * csk)1703 void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1704 {
1705 struct cxgbi_device *cdev = csk->cdev;
1706 struct iscsi_conn *conn = csk->user_data;
1707 struct sk_buff *skb;
1708 unsigned int read = 0;
1709 int err = 0;
1710
1711 log_debug(1 << CXGBI_DBG_PDU_RX,
1712 "csk 0x%p, conn 0x%p.\n", csk, conn);
1713
1714 if (unlikely(!conn || conn->suspend_rx)) {
1715 log_debug(1 << CXGBI_DBG_PDU_RX,
1716 "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1717 csk, conn, conn ? conn->id : 0xFF,
1718 conn ? conn->suspend_rx : 0xFF);
1719 return;
1720 }
1721
1722 while (!err) {
1723 skb = skb_peek(&csk->receive_queue);
1724 if (!skb ||
1725 !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1726 if (skb)
1727 log_debug(1 << CXGBI_DBG_PDU_RX,
1728 "skb 0x%p, NOT ready 0x%lx.\n",
1729 skb, cxgbi_skcb_flags(skb));
1730 break;
1731 }
1732 __skb_unlink(skb, &csk->receive_queue);
1733
1734 read += cxgbi_skcb_rx_pdulen(skb);
1735 log_debug(1 << CXGBI_DBG_PDU_RX,
1736 "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1737 csk, skb, skb->len, cxgbi_skcb_flags(skb),
1738 cxgbi_skcb_rx_pdulen(skb));
1739
1740 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1741 err = skb_read_pdu_bhs(csk, conn, skb);
1742 if (err < 0) {
1743 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1744 "f 0x%lx, plen %u.\n",
1745 csk, skb, skb->len,
1746 cxgbi_skcb_flags(skb),
1747 cxgbi_skcb_rx_pdulen(skb));
1748 goto skb_done;
1749 }
1750 err = skb_read_pdu_data(conn, skb, skb,
1751 err + cdev->skb_rx_extra);
1752 if (err < 0)
1753 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1754 "f 0x%lx, plen %u.\n",
1755 csk, skb, skb->len,
1756 cxgbi_skcb_flags(skb),
1757 cxgbi_skcb_rx_pdulen(skb));
1758 } else {
1759 err = skb_read_pdu_bhs(csk, conn, skb);
1760 if (err < 0) {
1761 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1762 "f 0x%lx, plen %u.\n",
1763 csk, skb, skb->len,
1764 cxgbi_skcb_flags(skb),
1765 cxgbi_skcb_rx_pdulen(skb));
1766 goto skb_done;
1767 }
1768
1769 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1770 struct sk_buff *dskb;
1771
1772 dskb = skb_peek(&csk->receive_queue);
1773 if (!dskb) {
1774 pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1775 " plen %u, NO data.\n",
1776 csk, skb, skb->len,
1777 cxgbi_skcb_flags(skb),
1778 cxgbi_skcb_rx_pdulen(skb));
1779 err = -EIO;
1780 goto skb_done;
1781 }
1782 __skb_unlink(dskb, &csk->receive_queue);
1783
1784 err = skb_read_pdu_data(conn, skb, dskb, 0);
1785 if (err < 0)
1786 pr_err("data, csk 0x%p, skb 0x%p,%u, "
1787 "f 0x%lx, plen %u, dskb 0x%p,"
1788 "%u.\n",
1789 csk, skb, skb->len,
1790 cxgbi_skcb_flags(skb),
1791 cxgbi_skcb_rx_pdulen(skb),
1792 dskb, dskb->len);
1793 __kfree_skb(dskb);
1794 } else
1795 err = skb_read_pdu_data(conn, skb, skb, 0);
1796 }
1797 skb_done:
1798 __kfree_skb(skb);
1799
1800 if (err < 0)
1801 break;
1802 }
1803
1804 log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
1805 if (read) {
1806 csk->copied_seq += read;
1807 csk_return_rx_credits(csk, read);
1808 conn->rxdata_octets += read;
1809 }
1810
1811 if (err < 0) {
1812 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
1813 csk, conn, err, read);
1814 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1815 }
1816 }
1817 EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
1818
sgl_seek_offset(struct scatterlist * sgl,unsigned int sgcnt,unsigned int offset,unsigned int * off,struct scatterlist ** sgp)1819 static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
1820 unsigned int offset, unsigned int *off,
1821 struct scatterlist **sgp)
1822 {
1823 int i;
1824 struct scatterlist *sg;
1825
1826 for_each_sg(sgl, sg, sgcnt, i) {
1827 if (offset < sg->length) {
1828 *off = offset;
1829 *sgp = sg;
1830 return 0;
1831 }
1832 offset -= sg->length;
1833 }
1834 return -EFAULT;
1835 }
1836
sgl_read_to_frags(struct scatterlist * sg,unsigned int sgoffset,unsigned int dlen,struct page_frag * frags,int frag_max)1837 static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
1838 unsigned int dlen, struct page_frag *frags,
1839 int frag_max)
1840 {
1841 unsigned int datalen = dlen;
1842 unsigned int sglen = sg->length - sgoffset;
1843 struct page *page = sg_page(sg);
1844 int i;
1845
1846 i = 0;
1847 do {
1848 unsigned int copy;
1849
1850 if (!sglen) {
1851 sg = sg_next(sg);
1852 if (!sg) {
1853 pr_warn("sg %d NULL, len %u/%u.\n",
1854 i, datalen, dlen);
1855 return -EINVAL;
1856 }
1857 sgoffset = 0;
1858 sglen = sg->length;
1859 page = sg_page(sg);
1860
1861 }
1862 copy = min(datalen, sglen);
1863 if (i && page == frags[i - 1].page &&
1864 sgoffset + sg->offset ==
1865 frags[i - 1].offset + frags[i - 1].size) {
1866 frags[i - 1].size += copy;
1867 } else {
1868 if (i >= frag_max) {
1869 pr_warn("too many pages %u, dlen %u.\n",
1870 frag_max, dlen);
1871 return -EINVAL;
1872 }
1873
1874 frags[i].page = page;
1875 frags[i].offset = sg->offset + sgoffset;
1876 frags[i].size = copy;
1877 i++;
1878 }
1879 datalen -= copy;
1880 sgoffset += copy;
1881 sglen -= copy;
1882 } while (datalen);
1883
1884 return i;
1885 }
1886
cxgbi_conn_alloc_pdu(struct iscsi_task * task,u8 opcode)1887 int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
1888 {
1889 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1890 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1891 struct cxgbi_device *cdev = cconn->chba->cdev;
1892 struct iscsi_conn *conn = task->conn;
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 struct cxgbi_sock *csk = cconn->cep->csk;
1897 struct net_device *ndev = cdev->ports[csk->port_id];
1898 int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
1899
1900 tcp_task->dd_data = tdata;
1901 task->hdr = NULL;
1902
1903 if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
1904 (opcode == ISCSI_OP_SCSI_DATA_OUT ||
1905 (opcode == ISCSI_OP_SCSI_CMD &&
1906 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
1907 /* data could goes into skb head */
1908 headroom += min_t(unsigned int,
1909 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
1910 conn->max_xmit_dlength);
1911
1912 tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
1913 if (!tdata->skb) {
1914 ndev->stats.tx_dropped++;
1915 return -ENOMEM;
1916 }
1917
1918 skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
1919
1920 if (task->sc) {
1921 task->hdr = (struct iscsi_hdr *)tdata->skb->data;
1922 } else {
1923 task->hdr = kzalloc(SKB_TX_ISCSI_PDU_HEADER_MAX, GFP_ATOMIC);
1924 if (!task->hdr) {
1925 __kfree_skb(tdata->skb);
1926 tdata->skb = NULL;
1927 ndev->stats.tx_dropped++;
1928 return -ENOMEM;
1929 }
1930 }
1931 task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
1932
1933 /* data_out uses scsi_cmd's itt */
1934 if (opcode != ISCSI_OP_SCSI_DATA_OUT)
1935 task_reserve_itt(task, &task->hdr->itt);
1936
1937 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1938 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
1939 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
1940 conn->max_xmit_dlength, ntohl(task->hdr->itt));
1941
1942 return 0;
1943 }
1944 EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
1945
tx_skb_setmode(struct sk_buff * skb,int hcrc,int dcrc)1946 static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
1947 {
1948 if (hcrc || dcrc) {
1949 u8 submode = 0;
1950
1951 if (hcrc)
1952 submode |= 1;
1953 if (dcrc)
1954 submode |= 2;
1955 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
1956 } else
1957 cxgbi_skcb_ulp_mode(skb) = 0;
1958 }
1959
cxgbi_conn_init_pdu(struct iscsi_task * task,unsigned int offset,unsigned int count)1960 int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
1961 unsigned int count)
1962 {
1963 struct iscsi_conn *conn = task->conn;
1964 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1965 struct sk_buff *skb = tdata->skb;
1966 unsigned int datalen = count;
1967 int i, padlen = iscsi_padding(count);
1968 struct page *pg;
1969
1970 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1971 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
1972 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
1973 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
1974
1975 skb_put(skb, task->hdr_len);
1976 tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
1977 if (!count)
1978 return 0;
1979
1980 if (task->sc) {
1981 struct scsi_data_buffer *sdb = scsi_out(task->sc);
1982 struct scatterlist *sg = NULL;
1983 int err;
1984
1985 tdata->offset = offset;
1986 tdata->count = count;
1987 err = sgl_seek_offset(
1988 sdb->table.sgl, sdb->table.nents,
1989 tdata->offset, &tdata->sgoffset, &sg);
1990 if (err < 0) {
1991 pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
1992 sdb->table.nents, tdata->offset, sdb->length);
1993 return err;
1994 }
1995 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
1996 tdata->frags, MAX_PDU_FRAGS);
1997 if (err < 0) {
1998 pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
1999 sdb->table.nents, tdata->offset, tdata->count);
2000 return err;
2001 }
2002 tdata->nr_frags = err;
2003
2004 if (tdata->nr_frags > MAX_SKB_FRAGS ||
2005 (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
2006 char *dst = skb->data + task->hdr_len;
2007 struct page_frag *frag = tdata->frags;
2008
2009 /* data fits in the skb's headroom */
2010 for (i = 0; i < tdata->nr_frags; i++, frag++) {
2011 char *src = kmap_atomic(frag->page);
2012
2013 memcpy(dst, src+frag->offset, frag->size);
2014 dst += frag->size;
2015 kunmap_atomic(src);
2016 }
2017 if (padlen) {
2018 memset(dst, 0, padlen);
2019 padlen = 0;
2020 }
2021 skb_put(skb, count + padlen);
2022 } else {
2023 /* data fit into frag_list */
2024 for (i = 0; i < tdata->nr_frags; i++) {
2025 __skb_fill_page_desc(skb, i,
2026 tdata->frags[i].page,
2027 tdata->frags[i].offset,
2028 tdata->frags[i].size);
2029 skb_frag_ref(skb, i);
2030 }
2031 skb_shinfo(skb)->nr_frags = tdata->nr_frags;
2032 skb->len += count;
2033 skb->data_len += count;
2034 skb->truesize += count;
2035 }
2036
2037 } else {
2038 pg = virt_to_page(task->data);
2039
2040 get_page(pg);
2041 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
2042 count);
2043 skb->len += count;
2044 skb->data_len += count;
2045 skb->truesize += count;
2046 }
2047
2048 if (padlen) {
2049 i = skb_shinfo(skb)->nr_frags;
2050 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
2051 virt_to_page(padding), offset_in_page(padding),
2052 padlen);
2053
2054 skb->data_len += padlen;
2055 skb->truesize += padlen;
2056 skb->len += padlen;
2057 }
2058
2059 return 0;
2060 }
2061 EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
2062
cxgbi_conn_xmit_pdu(struct iscsi_task * task)2063 int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2064 {
2065 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2066 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2067 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2068 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
2069 struct sk_buff *skb = tdata->skb;
2070 struct cxgbi_sock *csk = NULL;
2071 unsigned int datalen;
2072 int err;
2073
2074 if (!skb) {
2075 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2076 "task 0x%p\n", task);
2077 return 0;
2078 }
2079
2080 if (cconn && cconn->cep)
2081 csk = cconn->cep->csk;
2082 if (!csk) {
2083 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2084 "task 0x%p, csk gone.\n", task);
2085 return -EPIPE;
2086 }
2087
2088 tdata->skb = NULL;
2089 datalen = skb->data_len;
2090
2091 /* write ppod first if using ofldq to write ppod */
2092 if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_VALID) {
2093 struct cxgbi_ppm *ppm = csk->cdev->cdev2ppm(csk->cdev);
2094
2095 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_VALID;
2096 if (csk->cdev->csk_ddp_set_map(ppm, csk, ttinfo) < 0)
2097 pr_err("task 0x%p, ppod writing using ofldq failed.\n",
2098 task);
2099 /* continue. Let fl get the data */
2100 }
2101
2102 if (!task->sc)
2103 memcpy(skb->data, task->hdr, SKB_TX_ISCSI_PDU_HEADER_MAX);
2104
2105 err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2106 if (err > 0) {
2107 int pdulen = err;
2108
2109 log_debug(1 << CXGBI_DBG_PDU_TX,
2110 "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2111 task, task->sc, skb, skb->len, skb->data_len, err);
2112
2113 if (task->conn->hdrdgst_en)
2114 pdulen += ISCSI_DIGEST_SIZE;
2115
2116 if (datalen && task->conn->datadgst_en)
2117 pdulen += ISCSI_DIGEST_SIZE;
2118
2119 task->conn->txdata_octets += pdulen;
2120 return 0;
2121 }
2122
2123 if (err == -EAGAIN || err == -ENOBUFS) {
2124 log_debug(1 << CXGBI_DBG_PDU_TX,
2125 "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2126 task, skb, skb->len, skb->data_len, err);
2127 /* reset skb to send when we are called again */
2128 tdata->skb = skb;
2129 return err;
2130 }
2131
2132 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2133 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2134 task->itt, skb, skb->len, skb->data_len, err);
2135
2136 __kfree_skb(skb);
2137
2138 iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2139 iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2140 return err;
2141 }
2142 EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2143
cxgbi_cleanup_task(struct iscsi_task * task)2144 void cxgbi_cleanup_task(struct iscsi_task *task)
2145 {
2146 struct iscsi_tcp_task *tcp_task = task->dd_data;
2147 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2148
2149 if (!tcp_task || !tdata || (tcp_task->dd_data != tdata)) {
2150 pr_info("task 0x%p,0x%p, tcp_task 0x%p, tdata 0x%p/0x%p.\n",
2151 task, task->sc, tcp_task,
2152 tcp_task ? tcp_task->dd_data : NULL, tdata);
2153 return;
2154 }
2155
2156 log_debug(1 << CXGBI_DBG_ISCSI,
2157 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2158 task, tdata->skb, task->hdr_itt);
2159
2160 tcp_task->dd_data = NULL;
2161
2162 if (!task->sc)
2163 kfree(task->hdr);
2164 task->hdr = NULL;
2165
2166 /* never reached the xmit task callout */
2167 if (tdata->skb) {
2168 __kfree_skb(tdata->skb);
2169 tdata->skb = NULL;
2170 }
2171
2172 task_release_itt(task, task->hdr_itt);
2173 memset(tdata, 0, sizeof(*tdata));
2174
2175 iscsi_tcp_cleanup_task(task);
2176 }
2177 EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2178
cxgbi_get_conn_stats(struct iscsi_cls_conn * cls_conn,struct iscsi_stats * stats)2179 void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2180 struct iscsi_stats *stats)
2181 {
2182 struct iscsi_conn *conn = cls_conn->dd_data;
2183
2184 stats->txdata_octets = conn->txdata_octets;
2185 stats->rxdata_octets = conn->rxdata_octets;
2186 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2187 stats->dataout_pdus = conn->dataout_pdus_cnt;
2188 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2189 stats->datain_pdus = conn->datain_pdus_cnt;
2190 stats->r2t_pdus = conn->r2t_pdus_cnt;
2191 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2192 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2193 stats->digest_err = 0;
2194 stats->timeout_err = 0;
2195 stats->custom_length = 1;
2196 strcpy(stats->custom[0].desc, "eh_abort_cnt");
2197 stats->custom[0].value = conn->eh_abort_cnt;
2198 }
2199 EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2200
cxgbi_conn_max_xmit_dlength(struct iscsi_conn * conn)2201 static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2202 {
2203 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2204 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2205 struct cxgbi_device *cdev = cconn->chba->cdev;
2206 unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2207 unsigned int max_def = 512 * MAX_SKB_FRAGS;
2208 unsigned int max = max(max_def, headroom);
2209
2210 max = min(cconn->chba->cdev->tx_max_size, max);
2211 if (conn->max_xmit_dlength)
2212 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2213 else
2214 conn->max_xmit_dlength = max;
2215 cxgbi_align_pdu_size(conn->max_xmit_dlength);
2216
2217 return 0;
2218 }
2219
cxgbi_conn_max_recv_dlength(struct iscsi_conn * conn)2220 static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2221 {
2222 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2223 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2224 unsigned int max = cconn->chba->cdev->rx_max_size;
2225
2226 cxgbi_align_pdu_size(max);
2227
2228 if (conn->max_recv_dlength) {
2229 if (conn->max_recv_dlength > max) {
2230 pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2231 conn->max_recv_dlength, max);
2232 return -EINVAL;
2233 }
2234 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2235 cxgbi_align_pdu_size(conn->max_recv_dlength);
2236 } else
2237 conn->max_recv_dlength = max;
2238
2239 return 0;
2240 }
2241
cxgbi_set_conn_param(struct iscsi_cls_conn * cls_conn,enum iscsi_param param,char * buf,int buflen)2242 int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2243 enum iscsi_param param, char *buf, int buflen)
2244 {
2245 struct iscsi_conn *conn = cls_conn->dd_data;
2246 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2247 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2248 struct cxgbi_sock *csk = cconn->cep->csk;
2249 int err;
2250
2251 log_debug(1 << CXGBI_DBG_ISCSI,
2252 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2253 cls_conn, param, buflen, buf);
2254
2255 switch (param) {
2256 case ISCSI_PARAM_HDRDGST_EN:
2257 err = iscsi_set_param(cls_conn, param, buf, buflen);
2258 if (!err && conn->hdrdgst_en)
2259 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2260 conn->hdrdgst_en,
2261 conn->datadgst_en);
2262 break;
2263 case ISCSI_PARAM_DATADGST_EN:
2264 err = iscsi_set_param(cls_conn, param, buf, buflen);
2265 if (!err && conn->datadgst_en)
2266 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2267 conn->hdrdgst_en,
2268 conn->datadgst_en);
2269 break;
2270 case ISCSI_PARAM_MAX_R2T:
2271 return iscsi_tcp_set_max_r2t(conn, buf);
2272 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2273 err = iscsi_set_param(cls_conn, param, buf, buflen);
2274 if (!err)
2275 err = cxgbi_conn_max_recv_dlength(conn);
2276 break;
2277 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2278 err = iscsi_set_param(cls_conn, param, buf, buflen);
2279 if (!err)
2280 err = cxgbi_conn_max_xmit_dlength(conn);
2281 break;
2282 default:
2283 return iscsi_set_param(cls_conn, param, buf, buflen);
2284 }
2285 return err;
2286 }
2287 EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2288
csk_print_port(struct cxgbi_sock * csk,char * buf)2289 static inline int csk_print_port(struct cxgbi_sock *csk, char *buf)
2290 {
2291 int len;
2292
2293 cxgbi_sock_get(csk);
2294 len = sprintf(buf, "%hu\n", ntohs(csk->daddr.sin_port));
2295 cxgbi_sock_put(csk);
2296
2297 return len;
2298 }
2299
csk_print_ip(struct cxgbi_sock * csk,char * buf)2300 static inline int csk_print_ip(struct cxgbi_sock *csk, char *buf)
2301 {
2302 int len;
2303
2304 cxgbi_sock_get(csk);
2305 if (csk->csk_family == AF_INET)
2306 len = sprintf(buf, "%pI4",
2307 &csk->daddr.sin_addr.s_addr);
2308 else
2309 len = sprintf(buf, "%pI6",
2310 &csk->daddr6.sin6_addr);
2311
2312 cxgbi_sock_put(csk);
2313
2314 return len;
2315 }
2316
cxgbi_get_ep_param(struct iscsi_endpoint * ep,enum iscsi_param param,char * buf)2317 int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2318 char *buf)
2319 {
2320 struct cxgbi_endpoint *cep = ep->dd_data;
2321 struct cxgbi_sock *csk;
2322 int len;
2323
2324 log_debug(1 << CXGBI_DBG_ISCSI,
2325 "cls_conn 0x%p, param %d.\n", ep, param);
2326
2327 switch (param) {
2328 case ISCSI_PARAM_CONN_PORT:
2329 case ISCSI_PARAM_CONN_ADDRESS:
2330 if (!cep)
2331 return -ENOTCONN;
2332
2333 csk = cep->csk;
2334 if (!csk)
2335 return -ENOTCONN;
2336
2337 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2338 &csk->daddr, param, buf);
2339 default:
2340 return -ENOSYS;
2341 }
2342 return len;
2343 }
2344 EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
2345
2346 struct iscsi_cls_conn *
cxgbi_create_conn(struct iscsi_cls_session * cls_session,u32 cid)2347 cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2348 {
2349 struct iscsi_cls_conn *cls_conn;
2350 struct iscsi_conn *conn;
2351 struct iscsi_tcp_conn *tcp_conn;
2352 struct cxgbi_conn *cconn;
2353
2354 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2355 if (!cls_conn)
2356 return NULL;
2357
2358 conn = cls_conn->dd_data;
2359 tcp_conn = conn->dd_data;
2360 cconn = tcp_conn->dd_data;
2361 cconn->iconn = conn;
2362
2363 log_debug(1 << CXGBI_DBG_ISCSI,
2364 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2365 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2366
2367 return cls_conn;
2368 }
2369 EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2370
cxgbi_bind_conn(struct iscsi_cls_session * cls_session,struct iscsi_cls_conn * cls_conn,u64 transport_eph,int is_leading)2371 int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2372 struct iscsi_cls_conn *cls_conn,
2373 u64 transport_eph, int is_leading)
2374 {
2375 struct iscsi_conn *conn = cls_conn->dd_data;
2376 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2377 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2378 struct cxgbi_ppm *ppm;
2379 struct iscsi_endpoint *ep;
2380 struct cxgbi_endpoint *cep;
2381 struct cxgbi_sock *csk;
2382 int err;
2383
2384 ep = iscsi_lookup_endpoint(transport_eph);
2385 if (!ep)
2386 return -EINVAL;
2387
2388 /* setup ddp pagesize */
2389 cep = ep->dd_data;
2390 csk = cep->csk;
2391
2392 ppm = csk->cdev->cdev2ppm(csk->cdev);
2393 err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid,
2394 ppm->tformat.pgsz_idx_dflt);
2395 if (err < 0)
2396 return err;
2397
2398 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2399 if (err)
2400 return -EINVAL;
2401
2402 /* calculate the tag idx bits needed for this conn based on cmds_max */
2403 cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2404
2405 write_lock_bh(&csk->callback_lock);
2406 csk->user_data = conn;
2407 cconn->chba = cep->chba;
2408 cconn->cep = cep;
2409 cep->cconn = cconn;
2410 write_unlock_bh(&csk->callback_lock);
2411
2412 cxgbi_conn_max_xmit_dlength(conn);
2413 cxgbi_conn_max_recv_dlength(conn);
2414
2415 log_debug(1 << CXGBI_DBG_ISCSI,
2416 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2417 cls_session, cls_conn, ep, cconn, csk);
2418 /* init recv engine */
2419 iscsi_tcp_hdr_recv_prep(tcp_conn);
2420
2421 return 0;
2422 }
2423 EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2424
cxgbi_create_session(struct iscsi_endpoint * ep,u16 cmds_max,u16 qdepth,u32 initial_cmdsn)2425 struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2426 u16 cmds_max, u16 qdepth,
2427 u32 initial_cmdsn)
2428 {
2429 struct cxgbi_endpoint *cep;
2430 struct cxgbi_hba *chba;
2431 struct Scsi_Host *shost;
2432 struct iscsi_cls_session *cls_session;
2433 struct iscsi_session *session;
2434
2435 if (!ep) {
2436 pr_err("missing endpoint.\n");
2437 return NULL;
2438 }
2439
2440 cep = ep->dd_data;
2441 chba = cep->chba;
2442 shost = chba->shost;
2443
2444 BUG_ON(chba != iscsi_host_priv(shost));
2445
2446 cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2447 cmds_max, 0,
2448 sizeof(struct iscsi_tcp_task) +
2449 sizeof(struct cxgbi_task_data),
2450 initial_cmdsn, ISCSI_MAX_TARGET);
2451 if (!cls_session)
2452 return NULL;
2453
2454 session = cls_session->dd_data;
2455 if (iscsi_tcp_r2tpool_alloc(session))
2456 goto remove_session;
2457
2458 log_debug(1 << CXGBI_DBG_ISCSI,
2459 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2460 return cls_session;
2461
2462 remove_session:
2463 iscsi_session_teardown(cls_session);
2464 return NULL;
2465 }
2466 EXPORT_SYMBOL_GPL(cxgbi_create_session);
2467
cxgbi_destroy_session(struct iscsi_cls_session * cls_session)2468 void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2469 {
2470 log_debug(1 << CXGBI_DBG_ISCSI,
2471 "cls sess 0x%p.\n", cls_session);
2472
2473 iscsi_tcp_r2tpool_free(cls_session->dd_data);
2474 iscsi_session_teardown(cls_session);
2475 }
2476 EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2477
cxgbi_set_host_param(struct Scsi_Host * shost,enum iscsi_host_param param,char * buf,int buflen)2478 int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2479 char *buf, int buflen)
2480 {
2481 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2482
2483 if (!chba->ndev) {
2484 shost_printk(KERN_ERR, shost, "Could not get host param. "
2485 "netdev for host not set.\n");
2486 return -ENODEV;
2487 }
2488
2489 log_debug(1 << CXGBI_DBG_ISCSI,
2490 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2491 shost, chba, chba->ndev->name, param, buflen, buf);
2492
2493 switch (param) {
2494 case ISCSI_HOST_PARAM_IPADDRESS:
2495 {
2496 __be32 addr = in_aton(buf);
2497 log_debug(1 << CXGBI_DBG_ISCSI,
2498 "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2499 cxgbi_set_iscsi_ipv4(chba, addr);
2500 return 0;
2501 }
2502 case ISCSI_HOST_PARAM_HWADDRESS:
2503 case ISCSI_HOST_PARAM_NETDEV_NAME:
2504 return 0;
2505 default:
2506 return iscsi_host_set_param(shost, param, buf, buflen);
2507 }
2508 }
2509 EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2510
cxgbi_get_host_param(struct Scsi_Host * shost,enum iscsi_host_param param,char * buf)2511 int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2512 char *buf)
2513 {
2514 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2515 int len = 0;
2516
2517 if (!chba->ndev) {
2518 shost_printk(KERN_ERR, shost, "Could not get host param. "
2519 "netdev for host not set.\n");
2520 return -ENODEV;
2521 }
2522
2523 log_debug(1 << CXGBI_DBG_ISCSI,
2524 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2525 shost, chba, chba->ndev->name, param);
2526
2527 switch (param) {
2528 case ISCSI_HOST_PARAM_HWADDRESS:
2529 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2530 break;
2531 case ISCSI_HOST_PARAM_NETDEV_NAME:
2532 len = sprintf(buf, "%s\n", chba->ndev->name);
2533 break;
2534 case ISCSI_HOST_PARAM_IPADDRESS:
2535 {
2536 struct cxgbi_sock *csk = find_sock_on_port(chba->cdev,
2537 chba->port_id);
2538 if (csk) {
2539 len = sprintf(buf, "%pIS",
2540 (struct sockaddr *)&csk->saddr);
2541 }
2542 log_debug(1 << CXGBI_DBG_ISCSI,
2543 "hba %s, addr %s.\n", chba->ndev->name, buf);
2544 break;
2545 }
2546 default:
2547 return iscsi_host_get_param(shost, param, buf);
2548 }
2549
2550 return len;
2551 }
2552 EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2553
cxgbi_ep_connect(struct Scsi_Host * shost,struct sockaddr * dst_addr,int non_blocking)2554 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2555 struct sockaddr *dst_addr,
2556 int non_blocking)
2557 {
2558 struct iscsi_endpoint *ep;
2559 struct cxgbi_endpoint *cep;
2560 struct cxgbi_hba *hba = NULL;
2561 struct cxgbi_sock *csk;
2562 int ifindex = 0;
2563 int err = -EINVAL;
2564
2565 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2566 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2567 shost, non_blocking, dst_addr);
2568
2569 if (shost) {
2570 hba = iscsi_host_priv(shost);
2571 if (!hba) {
2572 pr_info("shost 0x%p, priv NULL.\n", shost);
2573 goto err_out;
2574 }
2575
2576 rtnl_lock();
2577 if (!vlan_uses_dev(hba->ndev))
2578 ifindex = hba->ndev->ifindex;
2579 rtnl_unlock();
2580 }
2581
2582 if (dst_addr->sa_family == AF_INET) {
2583 csk = cxgbi_check_route(dst_addr, ifindex);
2584 #if IS_ENABLED(CONFIG_IPV6)
2585 } else if (dst_addr->sa_family == AF_INET6) {
2586 csk = cxgbi_check_route6(dst_addr, ifindex);
2587 #endif
2588 } else {
2589 pr_info("address family 0x%x NOT supported.\n",
2590 dst_addr->sa_family);
2591 err = -EAFNOSUPPORT;
2592 return (struct iscsi_endpoint *)ERR_PTR(err);
2593 }
2594
2595 if (IS_ERR(csk))
2596 return (struct iscsi_endpoint *)csk;
2597 cxgbi_sock_get(csk);
2598
2599 if (!hba)
2600 hba = csk->cdev->hbas[csk->port_id];
2601 else if (hba != csk->cdev->hbas[csk->port_id]) {
2602 pr_info("Could not connect through requested host %u"
2603 "hba 0x%p != 0x%p (%u).\n",
2604 shost->host_no, hba,
2605 csk->cdev->hbas[csk->port_id], csk->port_id);
2606 err = -ENOSPC;
2607 goto release_conn;
2608 }
2609
2610 err = sock_get_port(csk);
2611 if (err)
2612 goto release_conn;
2613
2614 cxgbi_sock_set_state(csk, CTP_CONNECTING);
2615 err = csk->cdev->csk_init_act_open(csk);
2616 if (err)
2617 goto release_conn;
2618
2619 if (cxgbi_sock_is_closing(csk)) {
2620 err = -ENOSPC;
2621 pr_info("csk 0x%p is closing.\n", csk);
2622 goto release_conn;
2623 }
2624
2625 ep = iscsi_create_endpoint(sizeof(*cep));
2626 if (!ep) {
2627 err = -ENOMEM;
2628 pr_info("iscsi alloc ep, OOM.\n");
2629 goto release_conn;
2630 }
2631
2632 cep = ep->dd_data;
2633 cep->csk = csk;
2634 cep->chba = hba;
2635
2636 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2637 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2638 ep, cep, csk, hba, hba->ndev->name);
2639 return ep;
2640
2641 release_conn:
2642 cxgbi_sock_put(csk);
2643 cxgbi_sock_closed(csk);
2644 err_out:
2645 return ERR_PTR(err);
2646 }
2647 EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2648
cxgbi_ep_poll(struct iscsi_endpoint * ep,int timeout_ms)2649 int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2650 {
2651 struct cxgbi_endpoint *cep = ep->dd_data;
2652 struct cxgbi_sock *csk = cep->csk;
2653
2654 if (!cxgbi_sock_is_established(csk))
2655 return 0;
2656 return 1;
2657 }
2658 EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2659
cxgbi_ep_disconnect(struct iscsi_endpoint * ep)2660 void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2661 {
2662 struct cxgbi_endpoint *cep = ep->dd_data;
2663 struct cxgbi_conn *cconn = cep->cconn;
2664 struct cxgbi_sock *csk = cep->csk;
2665
2666 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2667 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2668 ep, cep, cconn, csk, csk->state, csk->flags);
2669
2670 if (cconn && cconn->iconn) {
2671 iscsi_suspend_tx(cconn->iconn);
2672 write_lock_bh(&csk->callback_lock);
2673 cep->csk->user_data = NULL;
2674 cconn->cep = NULL;
2675 write_unlock_bh(&csk->callback_lock);
2676 }
2677 iscsi_destroy_endpoint(ep);
2678
2679 if (likely(csk->state >= CTP_ESTABLISHED))
2680 need_active_close(csk);
2681 else
2682 cxgbi_sock_closed(csk);
2683
2684 cxgbi_sock_put(csk);
2685 }
2686 EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2687
cxgbi_iscsi_init(struct iscsi_transport * itp,struct scsi_transport_template ** stt)2688 int cxgbi_iscsi_init(struct iscsi_transport *itp,
2689 struct scsi_transport_template **stt)
2690 {
2691 *stt = iscsi_register_transport(itp);
2692 if (*stt == NULL) {
2693 pr_err("unable to register %s transport 0x%p.\n",
2694 itp->name, itp);
2695 return -ENODEV;
2696 }
2697 log_debug(1 << CXGBI_DBG_ISCSI,
2698 "%s, registered iscsi transport 0x%p.\n",
2699 itp->name, stt);
2700 return 0;
2701 }
2702 EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2703
cxgbi_iscsi_cleanup(struct iscsi_transport * itp,struct scsi_transport_template ** stt)2704 void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2705 struct scsi_transport_template **stt)
2706 {
2707 if (*stt) {
2708 log_debug(1 << CXGBI_DBG_ISCSI,
2709 "de-register transport 0x%p, %s, stt 0x%p.\n",
2710 itp, itp->name, *stt);
2711 *stt = NULL;
2712 iscsi_unregister_transport(itp);
2713 }
2714 }
2715 EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2716
cxgbi_attr_is_visible(int param_type,int param)2717 umode_t cxgbi_attr_is_visible(int param_type, int param)
2718 {
2719 switch (param_type) {
2720 case ISCSI_HOST_PARAM:
2721 switch (param) {
2722 case ISCSI_HOST_PARAM_NETDEV_NAME:
2723 case ISCSI_HOST_PARAM_HWADDRESS:
2724 case ISCSI_HOST_PARAM_IPADDRESS:
2725 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2726 return S_IRUGO;
2727 default:
2728 return 0;
2729 }
2730 case ISCSI_PARAM:
2731 switch (param) {
2732 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2733 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2734 case ISCSI_PARAM_HDRDGST_EN:
2735 case ISCSI_PARAM_DATADGST_EN:
2736 case ISCSI_PARAM_CONN_ADDRESS:
2737 case ISCSI_PARAM_CONN_PORT:
2738 case ISCSI_PARAM_EXP_STATSN:
2739 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2740 case ISCSI_PARAM_PERSISTENT_PORT:
2741 case ISCSI_PARAM_PING_TMO:
2742 case ISCSI_PARAM_RECV_TMO:
2743 case ISCSI_PARAM_INITIAL_R2T_EN:
2744 case ISCSI_PARAM_MAX_R2T:
2745 case ISCSI_PARAM_IMM_DATA_EN:
2746 case ISCSI_PARAM_FIRST_BURST:
2747 case ISCSI_PARAM_MAX_BURST:
2748 case ISCSI_PARAM_PDU_INORDER_EN:
2749 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2750 case ISCSI_PARAM_ERL:
2751 case ISCSI_PARAM_TARGET_NAME:
2752 case ISCSI_PARAM_TPGT:
2753 case ISCSI_PARAM_USERNAME:
2754 case ISCSI_PARAM_PASSWORD:
2755 case ISCSI_PARAM_USERNAME_IN:
2756 case ISCSI_PARAM_PASSWORD_IN:
2757 case ISCSI_PARAM_FAST_ABORT:
2758 case ISCSI_PARAM_ABORT_TMO:
2759 case ISCSI_PARAM_LU_RESET_TMO:
2760 case ISCSI_PARAM_TGT_RESET_TMO:
2761 case ISCSI_PARAM_IFACE_NAME:
2762 case ISCSI_PARAM_INITIATOR_NAME:
2763 return S_IRUGO;
2764 default:
2765 return 0;
2766 }
2767 }
2768
2769 return 0;
2770 }
2771 EXPORT_SYMBOL_GPL(cxgbi_attr_is_visible);
2772
libcxgbi_init_module(void)2773 static int __init libcxgbi_init_module(void)
2774 {
2775 pr_info("%s", version);
2776
2777 BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, cb) <
2778 sizeof(struct cxgbi_skb_cb));
2779 return 0;
2780 }
2781
libcxgbi_exit_module(void)2782 static void __exit libcxgbi_exit_module(void)
2783 {
2784 cxgbi_device_unregister_all(0xFF);
2785 return;
2786 }
2787
2788 module_init(libcxgbi_init_module);
2789 module_exit(libcxgbi_exit_module);
2790