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ipv4: Make caller provide on-stack flow key to ip_route_output_ports().
[mirror_ubuntu-artful-kernel.git] / drivers / scsi / cxgbi / libcxgbi.c
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9ba682f0 1/*
2 * libcxgbi.c: Chelsio common library for T3/T4 iSCSI driver.
3 *
4 * Copyright (c) 2010 Chelsio Communications, Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation.
9 *
10 * Written by: Karen Xie (kxie@chelsio.com)
11 * Written by: Rakesh Ranjan (rranjan@chelsio.com)
12 */
13
14#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
15
16#include <linux/skbuff.h>
17#include <linux/crypto.h>
18#include <linux/scatterlist.h>
19#include <linux/pci.h>
20#include <scsi/scsi.h>
21#include <scsi/scsi_cmnd.h>
22#include <scsi/scsi_host.h>
23#include <linux/if_vlan.h>
24#include <linux/inet.h>
25#include <net/dst.h>
26#include <net/route.h>
27#include <linux/inetdevice.h> /* ip_dev_find */
28#include <net/tcp.h>
29
30static unsigned int dbg_level;
31
32#include "libcxgbi.h"
33
34#define DRV_MODULE_NAME "libcxgbi"
35#define DRV_MODULE_DESC "Chelsio iSCSI driver library"
36#define DRV_MODULE_VERSION "0.9.0"
37#define DRV_MODULE_RELDATE "Jun. 2010"
38
39MODULE_AUTHOR("Chelsio Communications, Inc.");
40MODULE_DESCRIPTION(DRV_MODULE_DESC);
41MODULE_VERSION(DRV_MODULE_VERSION);
42MODULE_LICENSE("GPL");
43
44module_param(dbg_level, uint, 0644);
45MODULE_PARM_DESC(dbg_level, "libiscsi debug level (default=0)");
46
47
48/*
49 * cxgbi device management
50 * maintains a list of the cxgbi devices
51 */
52static LIST_HEAD(cdev_list);
53static DEFINE_MUTEX(cdev_mutex);
54
55int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
56 unsigned int max_conn)
57{
58 struct cxgbi_ports_map *pmap = &cdev->pmap;
59
60 pmap->port_csk = cxgbi_alloc_big_mem(max_conn *
61 sizeof(struct cxgbi_sock *),
62 GFP_KERNEL);
63 if (!pmap->port_csk) {
64 pr_warn("cdev 0x%p, portmap OOM %u.\n", cdev, max_conn);
65 return -ENOMEM;
66 }
67
68 pmap->max_connect = max_conn;
69 pmap->sport_base = base;
70 spin_lock_init(&pmap->lock);
71 return 0;
72}
73EXPORT_SYMBOL_GPL(cxgbi_device_portmap_create);
74
75void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev)
76{
77 struct cxgbi_ports_map *pmap = &cdev->pmap;
78 struct cxgbi_sock *csk;
79 int i;
80
81 for (i = 0; i < pmap->max_connect; i++) {
82 if (pmap->port_csk[i]) {
83 csk = pmap->port_csk[i];
84 pmap->port_csk[i] = NULL;
85 log_debug(1 << CXGBI_DBG_SOCK,
86 "csk 0x%p, cdev 0x%p, offload down.\n",
87 csk, cdev);
88 spin_lock_bh(&csk->lock);
89 cxgbi_sock_set_flag(csk, CTPF_OFFLOAD_DOWN);
90 cxgbi_sock_closed(csk);
91 spin_unlock_bh(&csk->lock);
92 cxgbi_sock_put(csk);
93 }
94 }
95}
96EXPORT_SYMBOL_GPL(cxgbi_device_portmap_cleanup);
97
98static inline void cxgbi_device_destroy(struct cxgbi_device *cdev)
99{
100 log_debug(1 << CXGBI_DBG_DEV,
101 "cdev 0x%p, p# %u.\n", cdev, cdev->nports);
102 cxgbi_hbas_remove(cdev);
103 cxgbi_device_portmap_cleanup(cdev);
104 if (cdev->dev_ddp_cleanup)
105 cdev->dev_ddp_cleanup(cdev);
106 else
107 cxgbi_ddp_cleanup(cdev);
108 if (cdev->ddp)
109 cxgbi_ddp_cleanup(cdev);
110 if (cdev->pmap.max_connect)
111 cxgbi_free_big_mem(cdev->pmap.port_csk);
112 kfree(cdev);
113}
114
115struct cxgbi_device *cxgbi_device_register(unsigned int extra,
116 unsigned int nports)
117{
118 struct cxgbi_device *cdev;
119
120 cdev = kzalloc(sizeof(*cdev) + extra + nports *
121 (sizeof(struct cxgbi_hba *) +
122 sizeof(struct net_device *)),
123 GFP_KERNEL);
124 if (!cdev) {
125 pr_warn("nport %d, OOM.\n", nports);
126 return NULL;
127 }
128 cdev->ports = (struct net_device **)(cdev + 1);
129 cdev->hbas = (struct cxgbi_hba **)(((char*)cdev->ports) + nports *
130 sizeof(struct net_device *));
131 if (extra)
132 cdev->dd_data = ((char *)cdev->hbas) +
133 nports * sizeof(struct cxgbi_hba *);
134 spin_lock_init(&cdev->pmap.lock);
135
136 mutex_lock(&cdev_mutex);
137 list_add_tail(&cdev->list_head, &cdev_list);
138 mutex_unlock(&cdev_mutex);
139
140 log_debug(1 << CXGBI_DBG_DEV,
141 "cdev 0x%p, p# %u.\n", cdev, nports);
142 return cdev;
143}
144EXPORT_SYMBOL_GPL(cxgbi_device_register);
145
146void cxgbi_device_unregister(struct cxgbi_device *cdev)
147{
148 log_debug(1 << CXGBI_DBG_DEV,
149 "cdev 0x%p, p# %u,%s.\n",
150 cdev, cdev->nports, cdev->nports ? cdev->ports[0]->name : "");
151 mutex_lock(&cdev_mutex);
152 list_del(&cdev->list_head);
153 mutex_unlock(&cdev_mutex);
154 cxgbi_device_destroy(cdev);
155}
156EXPORT_SYMBOL_GPL(cxgbi_device_unregister);
157
158void cxgbi_device_unregister_all(unsigned int flag)
159{
160 struct cxgbi_device *cdev, *tmp;
161
162 mutex_lock(&cdev_mutex);
163 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
164 if ((cdev->flags & flag) == flag) {
165 log_debug(1 << CXGBI_DBG_DEV,
166 "cdev 0x%p, p# %u,%s.\n",
167 cdev, cdev->nports, cdev->nports ?
168 cdev->ports[0]->name : "");
169 list_del(&cdev->list_head);
170 cxgbi_device_destroy(cdev);
171 }
172 }
173 mutex_unlock(&cdev_mutex);
174}
175EXPORT_SYMBOL_GPL(cxgbi_device_unregister_all);
176
177struct cxgbi_device *cxgbi_device_find_by_lldev(void *lldev)
178{
179 struct cxgbi_device *cdev, *tmp;
180
181 mutex_lock(&cdev_mutex);
182 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
183 if (cdev->lldev == lldev) {
184 mutex_unlock(&cdev_mutex);
185 return cdev;
186 }
187 }
188 mutex_unlock(&cdev_mutex);
189 log_debug(1 << CXGBI_DBG_DEV,
190 "lldev 0x%p, NO match found.\n", lldev);
191 return NULL;
192}
193EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev);
194
195static struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev,
196 int *port)
197{
0b3d8947 198 struct net_device *vdev = NULL;
9ba682f0 199 struct cxgbi_device *cdev, *tmp;
200 int i;
201
0b3d8947 202 if (ndev->priv_flags & IFF_802_1Q_VLAN) {
203 vdev = ndev;
9ba682f0 204 ndev = vlan_dev_real_dev(ndev);
0b3d8947 205 log_debug(1 << CXGBI_DBG_DEV,
206 "vlan dev %s -> %s.\n", vdev->name, ndev->name);
207 }
9ba682f0 208
209 mutex_lock(&cdev_mutex);
210 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
211 for (i = 0; i < cdev->nports; i++) {
212 if (ndev == cdev->ports[i]) {
0b3d8947 213 cdev->hbas[i]->vdev = vdev;
9ba682f0 214 mutex_unlock(&cdev_mutex);
215 if (port)
216 *port = i;
217 return cdev;
218 }
219 }
220 }
221 mutex_unlock(&cdev_mutex);
222 log_debug(1 << CXGBI_DBG_DEV,
223 "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
224 return NULL;
225}
226
9ba682f0 227void cxgbi_hbas_remove(struct cxgbi_device *cdev)
228{
229 int i;
230 struct cxgbi_hba *chba;
231
232 log_debug(1 << CXGBI_DBG_DEV,
233 "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
234
235 for (i = 0; i < cdev->nports; i++) {
236 chba = cdev->hbas[i];
237 if (chba) {
238 cdev->hbas[i] = NULL;
239 iscsi_host_remove(chba->shost);
240 pci_dev_put(cdev->pdev);
241 iscsi_host_free(chba->shost);
242 }
243 }
244}
245EXPORT_SYMBOL_GPL(cxgbi_hbas_remove);
246
247int cxgbi_hbas_add(struct cxgbi_device *cdev, unsigned int max_lun,
248 unsigned int max_id, struct scsi_host_template *sht,
249 struct scsi_transport_template *stt)
250{
251 struct cxgbi_hba *chba;
252 struct Scsi_Host *shost;
253 int i, err;
254
255 log_debug(1 << CXGBI_DBG_DEV, "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
256
257 for (i = 0; i < cdev->nports; i++) {
258 shost = iscsi_host_alloc(sht, sizeof(*chba), 1);
259 if (!shost) {
260 pr_info("0x%p, p%d, %s, host alloc failed.\n",
261 cdev, i, cdev->ports[i]->name);
262 err = -ENOMEM;
263 goto err_out;
264 }
265
266 shost->transportt = stt;
267 shost->max_lun = max_lun;
268 shost->max_id = max_id;
269 shost->max_channel = 0;
270 shost->max_cmd_len = 16;
271
272 chba = iscsi_host_priv(shost);
273 chba->cdev = cdev;
274 chba->ndev = cdev->ports[i];
275 chba->shost = shost;
276
277 log_debug(1 << CXGBI_DBG_DEV,
278 "cdev 0x%p, p#%d %s: chba 0x%p.\n",
279 cdev, i, cdev->ports[i]->name, chba);
280
281 pci_dev_get(cdev->pdev);
282 err = iscsi_host_add(shost, &cdev->pdev->dev);
283 if (err) {
284 pr_info("cdev 0x%p, p#%d %s, host add failed.\n",
285 cdev, i, cdev->ports[i]->name);
286 pci_dev_put(cdev->pdev);
287 scsi_host_put(shost);
288 goto err_out;
289 }
290
291 cdev->hbas[i] = chba;
292 }
293
294 return 0;
295
296err_out:
297 cxgbi_hbas_remove(cdev);
298 return err;
299}
300EXPORT_SYMBOL_GPL(cxgbi_hbas_add);
301
302/*
303 * iSCSI offload
304 *
305 * - source port management
306 * To find a free source port in the port allocation map we use a very simple
307 * rotor scheme to look for the next free port.
308 *
309 * If a source port has been specified make sure that it doesn't collide with
310 * our normal source port allocation map. If it's outside the range of our
311 * allocation/deallocation scheme just let them use it.
312 *
313 * If the source port is outside our allocation range, the caller is
314 * responsible for keeping track of their port usage.
315 */
316static int sock_get_port(struct cxgbi_sock *csk)
317{
318 struct cxgbi_device *cdev = csk->cdev;
319 struct cxgbi_ports_map *pmap = &cdev->pmap;
320 unsigned int start;
321 int idx;
322
323 if (!pmap->max_connect) {
324 pr_err("cdev 0x%p, p#%u %s, NO port map.\n",
325 cdev, csk->port_id, cdev->ports[csk->port_id]->name);
326 return -EADDRNOTAVAIL;
327 }
328
329 if (csk->saddr.sin_port) {
330 pr_err("source port NON-ZERO %u.\n",
331 ntohs(csk->saddr.sin_port));
332 return -EADDRINUSE;
333 }
334
335 spin_lock_bh(&pmap->lock);
336 if (pmap->used >= pmap->max_connect) {
337 spin_unlock_bh(&pmap->lock);
338 pr_info("cdev 0x%p, p#%u %s, ALL ports used.\n",
339 cdev, csk->port_id, cdev->ports[csk->port_id]->name);
340 return -EADDRNOTAVAIL;
341 }
342
343 start = idx = pmap->next;
344 do {
345 if (++idx >= pmap->max_connect)
346 idx = 0;
347 if (!pmap->port_csk[idx]) {
348 pmap->used++;
349 csk->saddr.sin_port =
350 htons(pmap->sport_base + idx);
351 pmap->next = idx;
352 pmap->port_csk[idx] = csk;
353 spin_unlock_bh(&pmap->lock);
354 cxgbi_sock_get(csk);
355 log_debug(1 << CXGBI_DBG_SOCK,
356 "cdev 0x%p, p#%u %s, p %u, %u.\n",
357 cdev, csk->port_id,
358 cdev->ports[csk->port_id]->name,
359 pmap->sport_base + idx, pmap->next);
360 return 0;
361 }
362 } while (idx != start);
363 spin_unlock_bh(&pmap->lock);
364
365 /* should not happen */
366 pr_warn("cdev 0x%p, p#%u %s, next %u?\n",
367 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
368 pmap->next);
369 return -EADDRNOTAVAIL;
370}
371
372static void sock_put_port(struct cxgbi_sock *csk)
373{
374 struct cxgbi_device *cdev = csk->cdev;
375 struct cxgbi_ports_map *pmap = &cdev->pmap;
376
377 if (csk->saddr.sin_port) {
378 int idx = ntohs(csk->saddr.sin_port) - pmap->sport_base;
379
380 csk->saddr.sin_port = 0;
381 if (idx < 0 || idx >= pmap->max_connect) {
382 pr_err("cdev 0x%p, p#%u %s, port %u OOR.\n",
383 cdev, csk->port_id,
384 cdev->ports[csk->port_id]->name,
385 ntohs(csk->saddr.sin_port));
386 return;
387 }
388
389 spin_lock_bh(&pmap->lock);
390 pmap->port_csk[idx] = NULL;
391 pmap->used--;
392 spin_unlock_bh(&pmap->lock);
393
394 log_debug(1 << CXGBI_DBG_SOCK,
395 "cdev 0x%p, p#%u %s, release %u.\n",
396 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
397 pmap->sport_base + idx);
398
399 cxgbi_sock_put(csk);
400 }
401}
402
403/*
404 * iscsi tcp connection
405 */
406void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *csk)
407{
408 if (csk->cpl_close) {
409 kfree_skb(csk->cpl_close);
410 csk->cpl_close = NULL;
411 }
412 if (csk->cpl_abort_req) {
413 kfree_skb(csk->cpl_abort_req);
414 csk->cpl_abort_req = NULL;
415 }
416 if (csk->cpl_abort_rpl) {
417 kfree_skb(csk->cpl_abort_rpl);
418 csk->cpl_abort_rpl = NULL;
419 }
420}
421EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs);
422
423static struct cxgbi_sock *cxgbi_sock_create(struct cxgbi_device *cdev)
424{
425 struct cxgbi_sock *csk = kzalloc(sizeof(*csk), GFP_NOIO);
426
427 if (!csk) {
428 pr_info("alloc csk %zu failed.\n", sizeof(*csk));
429 return NULL;
430 }
431
432 if (cdev->csk_alloc_cpls(csk) < 0) {
433 pr_info("csk 0x%p, alloc cpls failed.\n", csk);
434 kfree(csk);
435 return NULL;
436 }
437
438 spin_lock_init(&csk->lock);
439 kref_init(&csk->refcnt);
440 skb_queue_head_init(&csk->receive_queue);
441 skb_queue_head_init(&csk->write_queue);
442 setup_timer(&csk->retry_timer, NULL, (unsigned long)csk);
443 rwlock_init(&csk->callback_lock);
444 csk->cdev = cdev;
445 csk->flags = 0;
446 cxgbi_sock_set_state(csk, CTP_CLOSED);
447
448 log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk);
449
450 return csk;
451}
452
453static struct rtable *find_route_ipv4(__be32 saddr, __be32 daddr,
78fbfd8a 454 __be16 sport, __be16 dport, u8 tos)
9ba682f0 455{
456 struct rtable *rt;
31e4543d 457 struct flowi4 fl4;
9ba682f0 458
31e4543d 459 rt = ip_route_output_ports(&init_net, &fl4, NULL, daddr, saddr,
78fbfd8a 460 dport, sport, IPPROTO_TCP, tos, 0);
b23dd4fe 461 if (IS_ERR(rt))
9ba682f0 462 return NULL;
463
464 return rt;
465}
466
467static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr)
468{
469 struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
470 struct dst_entry *dst;
471 struct net_device *ndev;
472 struct cxgbi_device *cdev;
473 struct rtable *rt = NULL;
474 struct cxgbi_sock *csk = NULL;
475 unsigned int mtu = 0;
476 int port = 0xFFFF;
477 int err = 0;
478
479 if (daddr->sin_family != AF_INET) {
480 pr_info("address family 0x%x NOT supported.\n",
481 daddr->sin_family);
482 err = -EAFNOSUPPORT;
483 goto err_out;
484 }
485
486 rt = find_route_ipv4(0, daddr->sin_addr.s_addr, 0, daddr->sin_port, 0);
487 if (!rt) {
488 pr_info("no route to ipv4 0x%x, port %u.\n",
489 daddr->sin_addr.s_addr, daddr->sin_port);
490 err = -ENETUNREACH;
491 goto err_out;
492 }
493 dst = &rt->dst;
494 ndev = dst->neighbour->dev;
495
496 if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
497 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
498 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
499 ndev->name);
500 err = -ENETUNREACH;
501 goto rel_rt;
502 }
503
504 if (ndev->flags & IFF_LOOPBACK) {
505 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
506 mtu = ndev->mtu;
507 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
508 dst->neighbour->dev->name, ndev->name, mtu);
509 }
510
9ba682f0 511 cdev = cxgbi_device_find_by_netdev(ndev, &port);
512 if (!cdev) {
513 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
514 &daddr->sin_addr.s_addr, ndev->name);
515 err = -ENETUNREACH;
516 goto rel_rt;
517 }
518 log_debug(1 << CXGBI_DBG_SOCK,
519 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
520 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
521 port, ndev->name, cdev);
522
523 csk = cxgbi_sock_create(cdev);
524 if (!csk) {
525 err = -ENOMEM;
526 goto rel_rt;
527 }
528 csk->cdev = cdev;
529 csk->port_id = port;
530 csk->mtu = mtu;
531 csk->dst = dst;
532 csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
533 csk->daddr.sin_port = daddr->sin_port;
c71b9b66 534 csk->daddr.sin_family = daddr->sin_family;
0b3d8947 535 csk->saddr.sin_addr.s_addr = rt->rt_src;
9ba682f0 536
537 return csk;
538
539rel_rt:
540 ip_rt_put(rt);
541 if (csk)
542 cxgbi_sock_closed(csk);
543err_out:
544 return ERR_PTR(err);
545}
546
547void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
548 unsigned int opt)
549{
550 csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
551 dst_confirm(csk->dst);
552 smp_mb();
553 cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
554}
555EXPORT_SYMBOL_GPL(cxgbi_sock_established);
556
557static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
558{
559 log_debug(1 << CXGBI_DBG_SOCK,
560 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
561 csk, csk->state, csk->flags, csk->user_data);
562
563 if (csk->state != CTP_ESTABLISHED) {
e3d2ad8c 564 read_lock_bh(&csk->callback_lock);
9ba682f0 565 if (csk->user_data)
566 iscsi_conn_failure(csk->user_data,
567 ISCSI_ERR_CONN_FAILED);
e3d2ad8c 568 read_unlock_bh(&csk->callback_lock);
9ba682f0 569 }
570}
571
572void cxgbi_sock_closed(struct cxgbi_sock *csk)
573{
574 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
575 csk, (csk)->state, (csk)->flags, (csk)->tid);
576 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
577 if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
578 return;
579 if (csk->saddr.sin_port)
580 sock_put_port(csk);
581 if (csk->dst)
582 dst_release(csk->dst);
583 csk->cdev->csk_release_offload_resources(csk);
584 cxgbi_sock_set_state(csk, CTP_CLOSED);
585 cxgbi_inform_iscsi_conn_closing(csk);
586 cxgbi_sock_put(csk);
587}
588EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
589
590static void need_active_close(struct cxgbi_sock *csk)
591{
592 int data_lost;
593 int close_req = 0;
594
595 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
596 csk, (csk)->state, (csk)->flags, (csk)->tid);
597 spin_lock_bh(&csk->lock);
598 dst_confirm(csk->dst);
599 data_lost = skb_queue_len(&csk->receive_queue);
600 __skb_queue_purge(&csk->receive_queue);
601
602 if (csk->state == CTP_ACTIVE_OPEN)
603 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
604 else if (csk->state == CTP_ESTABLISHED) {
605 close_req = 1;
606 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
607 } else if (csk->state == CTP_PASSIVE_CLOSE) {
608 close_req = 1;
609 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
610 }
611
612 if (close_req) {
613 if (data_lost)
614 csk->cdev->csk_send_abort_req(csk);
615 else
616 csk->cdev->csk_send_close_req(csk);
617 }
618
619 spin_unlock_bh(&csk->lock);
620}
621
622void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
623{
624 pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
625 csk, csk->state, csk->flags,
626 &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
627 &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
628 errno);
629
630 cxgbi_sock_set_state(csk, CTP_CONNECTING);
631 csk->err = errno;
632 cxgbi_sock_closed(csk);
633}
634EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
635
636void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
637{
638 struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
639
640 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
641 csk, (csk)->state, (csk)->flags, (csk)->tid);
642 cxgbi_sock_get(csk);
643 spin_lock_bh(&csk->lock);
644 if (csk->state == CTP_ACTIVE_OPEN)
645 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
646 spin_unlock_bh(&csk->lock);
647 cxgbi_sock_put(csk);
648 __kfree_skb(skb);
649}
650EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
651
652void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
653{
654 cxgbi_sock_get(csk);
655 spin_lock_bh(&csk->lock);
656 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
657 if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_RCVD))
658 cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
659 else {
660 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_RCVD);
661 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
662 if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
663 pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
664 csk, csk->state, csk->flags, csk->tid);
665 cxgbi_sock_closed(csk);
666 }
667 }
668 spin_unlock_bh(&csk->lock);
669 cxgbi_sock_put(csk);
670}
671EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
672
673void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
674{
675 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
676 csk, (csk)->state, (csk)->flags, (csk)->tid);
677 cxgbi_sock_get(csk);
678 spin_lock_bh(&csk->lock);
679
680 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
681 goto done;
682
683 switch (csk->state) {
684 case CTP_ESTABLISHED:
685 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
686 break;
687 case CTP_ACTIVE_CLOSE:
688 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
689 break;
690 case CTP_CLOSE_WAIT_1:
691 cxgbi_sock_closed(csk);
692 break;
693 case CTP_ABORTING:
694 break;
695 default:
696 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
697 csk, csk->state, csk->flags, csk->tid);
698 }
699 cxgbi_inform_iscsi_conn_closing(csk);
700done:
701 spin_unlock_bh(&csk->lock);
702 cxgbi_sock_put(csk);
703}
704EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
705
706void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
707{
708 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
709 csk, (csk)->state, (csk)->flags, (csk)->tid);
710 cxgbi_sock_get(csk);
711 spin_lock_bh(&csk->lock);
712
713 csk->snd_una = snd_nxt - 1;
714 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
715 goto done;
716
717 switch (csk->state) {
718 case CTP_ACTIVE_CLOSE:
719 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
720 break;
721 case CTP_CLOSE_WAIT_1:
722 case CTP_CLOSE_WAIT_2:
723 cxgbi_sock_closed(csk);
724 break;
725 case CTP_ABORTING:
726 break;
727 default:
728 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
729 csk, csk->state, csk->flags, csk->tid);
730 }
731done:
732 spin_unlock_bh(&csk->lock);
733 cxgbi_sock_put(csk);
734}
735EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
736
737void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
738 unsigned int snd_una, int seq_chk)
739{
740 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
741 "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
742 csk, csk->state, csk->flags, csk->tid, credits,
743 csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
744
745 spin_lock_bh(&csk->lock);
746
747 csk->wr_cred += credits;
748 if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
749 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
750
751 while (credits) {
752 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
753
754 if (unlikely(!p)) {
755 pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
756 csk, csk->state, csk->flags, csk->tid, credits,
757 csk->wr_cred, csk->wr_una_cred);
758 break;
759 }
760
761 if (unlikely(credits < p->csum)) {
762 pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
763 csk, csk->state, csk->flags, csk->tid,
764 credits, csk->wr_cred, csk->wr_una_cred,
765 p->csum);
766 p->csum -= credits;
767 break;
768 } else {
769 cxgbi_sock_dequeue_wr(csk);
770 credits -= p->csum;
771 kfree_skb(p);
772 }
773 }
774
775 cxgbi_sock_check_wr_invariants(csk);
776
777 if (seq_chk) {
778 if (unlikely(before(snd_una, csk->snd_una))) {
779 pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
780 csk, csk->state, csk->flags, csk->tid, snd_una,
781 csk->snd_una);
782 goto done;
783 }
784
785 if (csk->snd_una != snd_una) {
786 csk->snd_una = snd_una;
787 dst_confirm(csk->dst);
788 }
789 }
790
791 if (skb_queue_len(&csk->write_queue)) {
792 if (csk->cdev->csk_push_tx_frames(csk, 0))
793 cxgbi_conn_tx_open(csk);
794 } else
795 cxgbi_conn_tx_open(csk);
796done:
797 spin_unlock_bh(&csk->lock);
798}
799EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
800
801static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
802 unsigned short mtu)
803{
804 int i = 0;
805
806 while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
807 ++i;
808
809 return i;
810}
811
812unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
813{
814 unsigned int idx;
815 struct dst_entry *dst = csk->dst;
816
0dbaee3b 817 csk->advmss = dst_metric_advmss(dst);
9ba682f0 818
819 if (csk->advmss > pmtu - 40)
820 csk->advmss = pmtu - 40;
821 if (csk->advmss < csk->cdev->mtus[0] - 40)
822 csk->advmss = csk->cdev->mtus[0] - 40;
823 idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
824
825 return idx;
826}
827EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
828
829void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
830{
831 cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
832 __skb_queue_tail(&csk->write_queue, skb);
833}
834EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
835
836void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
837{
838 struct sk_buff *skb;
839
840 while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
841 kfree_skb(skb);
842}
843EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
844
845void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
846{
847 int pending = cxgbi_sock_count_pending_wrs(csk);
848
849 if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
850 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
851 csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
852}
853EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
854
855static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
856{
857 struct cxgbi_device *cdev = csk->cdev;
858 struct sk_buff *next;
859 int err, copied = 0;
860
861 spin_lock_bh(&csk->lock);
862
863 if (csk->state != CTP_ESTABLISHED) {
864 log_debug(1 << CXGBI_DBG_PDU_TX,
865 "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
866 csk, csk->state, csk->flags, csk->tid);
867 err = -EAGAIN;
868 goto out_err;
869 }
870
871 if (csk->err) {
872 log_debug(1 << CXGBI_DBG_PDU_TX,
873 "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
874 csk, csk->state, csk->flags, csk->tid, csk->err);
875 err = -EPIPE;
876 goto out_err;
877 }
878
879 if (csk->write_seq - csk->snd_una >= cdev->snd_win) {
880 log_debug(1 << CXGBI_DBG_PDU_TX,
881 "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
882 csk, csk->state, csk->flags, csk->tid, csk->write_seq,
883 csk->snd_una, cdev->snd_win);
884 err = -ENOBUFS;
885 goto out_err;
886 }
887
888 while (skb) {
889 int frags = skb_shinfo(skb)->nr_frags +
890 (skb->len != skb->data_len);
891
892 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
893 pr_err("csk 0x%p, skb head %u < %u.\n",
894 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
895 err = -EINVAL;
896 goto out_err;
897 }
898
899 if (frags >= SKB_WR_LIST_SIZE) {
900 pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
901 csk, skb_shinfo(skb)->nr_frags, skb->len,
902 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
903 err = -EINVAL;
904 goto out_err;
905 }
906
907 next = skb->next;
908 skb->next = NULL;
909 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
910 cxgbi_sock_skb_entail(csk, skb);
911 copied += skb->len;
912 csk->write_seq += skb->len +
913 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
914 skb = next;
915 }
916done:
917 if (likely(skb_queue_len(&csk->write_queue)))
918 cdev->csk_push_tx_frames(csk, 1);
919 spin_unlock_bh(&csk->lock);
920 return copied;
921
922out_err:
923 if (copied == 0 && err == -EPIPE)
924 copied = csk->err ? csk->err : -EPIPE;
925 else
926 copied = err;
927 goto done;
928}
929
930/*
931 * Direct Data Placement -
932 * Directly place the iSCSI Data-In or Data-Out PDU's payload into pre-posted
933 * final destination host-memory buffers based on the Initiator Task Tag (ITT)
934 * in Data-In or Target Task Tag (TTT) in Data-Out PDUs.
935 * The host memory address is programmed into h/w in the format of pagepod
936 * entries.
937 * The location of the pagepod entry is encoded into ddp tag which is used as
938 * the base for ITT/TTT.
939 */
940
941static unsigned char ddp_page_order[DDP_PGIDX_MAX] = {0, 1, 2, 4};
942static unsigned char ddp_page_shift[DDP_PGIDX_MAX] = {12, 13, 14, 16};
943static unsigned char page_idx = DDP_PGIDX_MAX;
944
945static unsigned char sw_tag_idx_bits;
946static unsigned char sw_tag_age_bits;
947
948/*
949 * Direct-Data Placement page size adjustment
950 */
951static int ddp_adjust_page_table(void)
952{
953 int i;
954 unsigned int base_order, order;
955
956 if (PAGE_SIZE < (1UL << ddp_page_shift[0])) {
957 pr_info("PAGE_SIZE 0x%lx too small, min 0x%lx\n",
958 PAGE_SIZE, 1UL << ddp_page_shift[0]);
959 return -EINVAL;
960 }
961
962 base_order = get_order(1UL << ddp_page_shift[0]);
963 order = get_order(1UL << PAGE_SHIFT);
964
965 for (i = 0; i < DDP_PGIDX_MAX; i++) {
966 /* first is the kernel page size, then just doubling */
967 ddp_page_order[i] = order - base_order + i;
968 ddp_page_shift[i] = PAGE_SHIFT + i;
969 }
970 return 0;
971}
972
973static int ddp_find_page_index(unsigned long pgsz)
974{
975 int i;
976
977 for (i = 0; i < DDP_PGIDX_MAX; i++) {
978 if (pgsz == (1UL << ddp_page_shift[i]))
979 return i;
980 }
981 pr_info("ddp page size %lu not supported.\n", pgsz);
982 return DDP_PGIDX_MAX;
983}
984
985static void ddp_setup_host_page_size(void)
986{
987 if (page_idx == DDP_PGIDX_MAX) {
988 page_idx = ddp_find_page_index(PAGE_SIZE);
989
990 if (page_idx == DDP_PGIDX_MAX) {
991 pr_info("system PAGE %lu, update hw.\n", PAGE_SIZE);
992 if (ddp_adjust_page_table() < 0) {
993 pr_info("PAGE %lu, disable ddp.\n", PAGE_SIZE);
994 return;
995 }
996 page_idx = ddp_find_page_index(PAGE_SIZE);
997 }
998 pr_info("system PAGE %lu, ddp idx %u.\n", PAGE_SIZE, page_idx);
999 }
1000}
1001
1002void cxgbi_ddp_page_size_factor(int *pgsz_factor)
1003{
1004 int i;
1005
1006 for (i = 0; i < DDP_PGIDX_MAX; i++)
1007 pgsz_factor[i] = ddp_page_order[i];
1008}
1009EXPORT_SYMBOL_GPL(cxgbi_ddp_page_size_factor);
1010
1011/*
1012 * DDP setup & teardown
1013 */
1014
1015void cxgbi_ddp_ppod_set(struct cxgbi_pagepod *ppod,
1016 struct cxgbi_pagepod_hdr *hdr,
1017 struct cxgbi_gather_list *gl, unsigned int gidx)
1018{
1019 int i;
1020
1021 memcpy(ppod, hdr, sizeof(*hdr));
1022 for (i = 0; i < (PPOD_PAGES_MAX + 1); i++, gidx++) {
1023 ppod->addr[i] = gidx < gl->nelem ?
1024 cpu_to_be64(gl->phys_addr[gidx]) : 0ULL;
1025 }
1026}
1027EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_set);
1028
1029void cxgbi_ddp_ppod_clear(struct cxgbi_pagepod *ppod)
1030{
1031 memset(ppod, 0, sizeof(*ppod));
1032}
1033EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_clear);
1034
1035static inline int ddp_find_unused_entries(struct cxgbi_ddp_info *ddp,
1036 unsigned int start, unsigned int max,
1037 unsigned int count,
1038 struct cxgbi_gather_list *gl)
1039{
1040 unsigned int i, j, k;
1041
1042 /* not enough entries */
1043 if ((max - start) < count) {
1044 log_debug(1 << CXGBI_DBG_DDP,
1045 "NOT enough entries %u+%u < %u.\n", start, count, max);
1046 return -EBUSY;
1047 }
1048
1049 max -= count;
1050 spin_lock(&ddp->map_lock);
1051 for (i = start; i < max;) {
1052 for (j = 0, k = i; j < count; j++, k++) {
1053 if (ddp->gl_map[k])
1054 break;
1055 }
1056 if (j == count) {
1057 for (j = 0, k = i; j < count; j++, k++)
1058 ddp->gl_map[k] = gl;
1059 spin_unlock(&ddp->map_lock);
1060 return i;
1061 }
1062 i += j + 1;
1063 }
1064 spin_unlock(&ddp->map_lock);
1065 log_debug(1 << CXGBI_DBG_DDP,
1066 "NO suitable entries %u available.\n", count);
1067 return -EBUSY;
1068}
1069
1070static inline void ddp_unmark_entries(struct cxgbi_ddp_info *ddp,
1071 int start, int count)
1072{
1073 spin_lock(&ddp->map_lock);
1074 memset(&ddp->gl_map[start], 0,
1075 count * sizeof(struct cxgbi_gather_list *));
1076 spin_unlock(&ddp->map_lock);
1077}
1078
1079static inline void ddp_gl_unmap(struct pci_dev *pdev,
1080 struct cxgbi_gather_list *gl)
1081{
1082 int i;
1083
1084 for (i = 0; i < gl->nelem; i++)
1085 dma_unmap_page(&pdev->dev, gl->phys_addr[i], PAGE_SIZE,
1086 PCI_DMA_FROMDEVICE);
1087}
1088
1089static inline int ddp_gl_map(struct pci_dev *pdev,
1090 struct cxgbi_gather_list *gl)
1091{
1092 int i;
1093
1094 for (i = 0; i < gl->nelem; i++) {
1095 gl->phys_addr[i] = dma_map_page(&pdev->dev, gl->pages[i], 0,
1096 PAGE_SIZE,
1097 PCI_DMA_FROMDEVICE);
1098 if (unlikely(dma_mapping_error(&pdev->dev, gl->phys_addr[i]))) {
1099 log_debug(1 << CXGBI_DBG_DDP,
1100 "page %d 0x%p, 0x%p dma mapping err.\n",
1101 i, gl->pages[i], pdev);
1102 goto unmap;
1103 }
1104 }
1105 return i;
1106unmap:
1107 if (i) {
1108 unsigned int nelem = gl->nelem;
1109
1110 gl->nelem = i;
1111 ddp_gl_unmap(pdev, gl);
1112 gl->nelem = nelem;
1113 }
1114 return -EINVAL;
1115}
1116
1117static void ddp_release_gl(struct cxgbi_gather_list *gl,
1118 struct pci_dev *pdev)
1119{
1120 ddp_gl_unmap(pdev, gl);
1121 kfree(gl);
1122}
1123
1124static struct cxgbi_gather_list *ddp_make_gl(unsigned int xferlen,
1125 struct scatterlist *sgl,
1126 unsigned int sgcnt,
1127 struct pci_dev *pdev,
1128 gfp_t gfp)
1129{
1130 struct cxgbi_gather_list *gl;
1131 struct scatterlist *sg = sgl;
1132 struct page *sgpage = sg_page(sg);
1133 unsigned int sglen = sg->length;
1134 unsigned int sgoffset = sg->offset;
1135 unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >>
1136 PAGE_SHIFT;
1137 int i = 1, j = 0;
1138
1139 if (xferlen < DDP_THRESHOLD) {
1140 log_debug(1 << CXGBI_DBG_DDP,
1141 "xfer %u < threshold %u, no ddp.\n",
1142 xferlen, DDP_THRESHOLD);
1143 return NULL;
1144 }
1145
1146 gl = kzalloc(sizeof(struct cxgbi_gather_list) +
1147 npages * (sizeof(dma_addr_t) +
1148 sizeof(struct page *)), gfp);
1149 if (!gl) {
1150 log_debug(1 << CXGBI_DBG_DDP,
1151 "xfer %u, %u pages, OOM.\n", xferlen, npages);
1152 return NULL;
1153 }
1154
1155 log_debug(1 << CXGBI_DBG_DDP,
1156 "xfer %u, sgl %u, gl max %u.\n", xferlen, sgcnt, npages);
1157
1158 gl->pages = (struct page **)&gl->phys_addr[npages];
1159 gl->nelem = npages;
1160 gl->length = xferlen;
1161 gl->offset = sgoffset;
1162 gl->pages[0] = sgpage;
1163
1164 for (i = 1, sg = sg_next(sgl), j = 0; i < sgcnt;
1165 i++, sg = sg_next(sg)) {
1166 struct page *page = sg_page(sg);
1167
1168 if (sgpage == page && sg->offset == sgoffset + sglen)
1169 sglen += sg->length;
1170 else {
1171 /* make sure the sgl is fit for ddp:
1172 * each has the same page size, and
1173 * all of the middle pages are used completely
1174 */
1175 if ((j && sgoffset) || ((i != sgcnt - 1) &&
1176 ((sglen + sgoffset) & ~PAGE_MASK))) {
1177 log_debug(1 << CXGBI_DBG_DDP,
1178 "page %d/%u, %u + %u.\n",
1179 i, sgcnt, sgoffset, sglen);
1180 goto error_out;
1181 }
1182
1183 j++;
1184 if (j == gl->nelem || sg->offset) {
1185 log_debug(1 << CXGBI_DBG_DDP,
1186 "page %d/%u, offset %u.\n",
1187 j, gl->nelem, sg->offset);
1188 goto error_out;
1189 }
1190 gl->pages[j] = page;
1191 sglen = sg->length;
1192 sgoffset = sg->offset;
1193 sgpage = page;
1194 }
1195 }
1196 gl->nelem = ++j;
1197
1198 if (ddp_gl_map(pdev, gl) < 0)
1199 goto error_out;
1200
1201 return gl;
1202
1203error_out:
1204 kfree(gl);
1205 return NULL;
1206}
1207
1208static void ddp_tag_release(struct cxgbi_hba *chba, u32 tag)
1209{
1210 struct cxgbi_device *cdev = chba->cdev;
1211 struct cxgbi_ddp_info *ddp = cdev->ddp;
1212 u32 idx;
1213
1214 idx = (tag >> PPOD_IDX_SHIFT) & ddp->idx_mask;
1215 if (idx < ddp->nppods) {
1216 struct cxgbi_gather_list *gl = ddp->gl_map[idx];
1217 unsigned int npods;
1218
1219 if (!gl || !gl->nelem) {
1220 pr_warn("tag 0x%x, idx %u, gl 0x%p, %u.\n",
1221 tag, idx, gl, gl ? gl->nelem : 0);
1222 return;
1223 }
1224 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1225 log_debug(1 << CXGBI_DBG_DDP,
1226 "tag 0x%x, release idx %u, npods %u.\n",
1227 tag, idx, npods);
1228 cdev->csk_ddp_clear(chba, tag, idx, npods);
1229 ddp_unmark_entries(ddp, idx, npods);
1230 ddp_release_gl(gl, ddp->pdev);
1231 } else
1232 pr_warn("tag 0x%x, idx %u > max %u.\n", tag, idx, ddp->nppods);
1233}
1234
1235static int ddp_tag_reserve(struct cxgbi_sock *csk, unsigned int tid,
1236 u32 sw_tag, u32 *tagp, struct cxgbi_gather_list *gl,
1237 gfp_t gfp)
1238{
1239 struct cxgbi_device *cdev = csk->cdev;
1240 struct cxgbi_ddp_info *ddp = cdev->ddp;
1241 struct cxgbi_tag_format *tformat = &cdev->tag_format;
1242 struct cxgbi_pagepod_hdr hdr;
1243 unsigned int npods;
1244 int idx = -1;
1245 int err = -ENOMEM;
1246 u32 tag;
1247
1248 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1249 if (ddp->idx_last == ddp->nppods)
1250 idx = ddp_find_unused_entries(ddp, 0, ddp->nppods,
1251 npods, gl);
1252 else {
1253 idx = ddp_find_unused_entries(ddp, ddp->idx_last + 1,
1254 ddp->nppods, npods,
1255 gl);
1256 if (idx < 0 && ddp->idx_last >= npods) {
1257 idx = ddp_find_unused_entries(ddp, 0,
1258 min(ddp->idx_last + npods, ddp->nppods),
1259 npods, gl);
1260 }
1261 }
1262 if (idx < 0) {
1263 log_debug(1 << CXGBI_DBG_DDP,
1264 "xferlen %u, gl %u, npods %u NO DDP.\n",
1265 gl->length, gl->nelem, npods);
1266 return idx;
1267 }
1268
9ba682f0 1269 tag = cxgbi_ddp_tag_base(tformat, sw_tag);
1270 tag |= idx << PPOD_IDX_SHIFT;
1271
1272 hdr.rsvd = 0;
1273 hdr.vld_tid = htonl(PPOD_VALID_FLAG | PPOD_TID(tid));
1274 hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask);
1275 hdr.max_offset = htonl(gl->length);
1276 hdr.page_offset = htonl(gl->offset);
1277
1278 err = cdev->csk_ddp_set(csk, &hdr, idx, npods, gl);
b8ce8b59 1279 if (err < 0)
9ba682f0 1280 goto unmark_entries;
9ba682f0 1281
1282 ddp->idx_last = idx;
1283 log_debug(1 << CXGBI_DBG_DDP,
1284 "xfer %u, gl %u,%u, tid 0x%x, tag 0x%x->0x%x(%u,%u).\n",
1285 gl->length, gl->nelem, gl->offset, tid, sw_tag, tag, idx,
1286 npods);
1287 *tagp = tag;
1288 return 0;
1289
1290unmark_entries:
1291 ddp_unmark_entries(ddp, idx, npods);
1292 return err;
1293}
1294
1295int cxgbi_ddp_reserve(struct cxgbi_sock *csk, unsigned int *tagp,
1296 unsigned int sw_tag, unsigned int xferlen,
1297 struct scatterlist *sgl, unsigned int sgcnt, gfp_t gfp)
1298{
1299 struct cxgbi_device *cdev = csk->cdev;
1300 struct cxgbi_tag_format *tformat = &cdev->tag_format;
1301 struct cxgbi_gather_list *gl;
1302 int err;
1303
1304 if (page_idx >= DDP_PGIDX_MAX || !cdev->ddp ||
1305 xferlen < DDP_THRESHOLD) {
1306 log_debug(1 << CXGBI_DBG_DDP,
1307 "pgidx %u, xfer %u, NO ddp.\n", page_idx, xferlen);
1308 return -EINVAL;
1309 }
1310
1311 if (!cxgbi_sw_tag_usable(tformat, sw_tag)) {
1312 log_debug(1 << CXGBI_DBG_DDP,
1313 "sw_tag 0x%x NOT usable.\n", sw_tag);
1314 return -EINVAL;
1315 }
1316
1317 gl = ddp_make_gl(xferlen, sgl, sgcnt, cdev->pdev, gfp);
1318 if (!gl)
1319 return -ENOMEM;
1320
1321 err = ddp_tag_reserve(csk, csk->tid, sw_tag, tagp, gl, gfp);
1322 if (err < 0)
1323 ddp_release_gl(gl, cdev->pdev);
1324
1325 return err;
1326}
1327
1328static void ddp_destroy(struct kref *kref)
1329{
1330 struct cxgbi_ddp_info *ddp = container_of(kref,
1331 struct cxgbi_ddp_info,
1332 refcnt);
1333 struct cxgbi_device *cdev = ddp->cdev;
1334 int i = 0;
1335
1336 pr_info("kref 0, destroy ddp 0x%p, cdev 0x%p.\n", ddp, cdev);
1337
1338 while (i < ddp->nppods) {
1339 struct cxgbi_gather_list *gl = ddp->gl_map[i];
1340
1341 if (gl) {
1342 int npods = (gl->nelem + PPOD_PAGES_MAX - 1)
1343 >> PPOD_PAGES_SHIFT;
1344 pr_info("cdev 0x%p, ddp %d + %d.\n", cdev, i, npods);
1345 kfree(gl);
9ba682f0 1346 i += npods;
1347 } else
1348 i++;
1349 }
1350 cxgbi_free_big_mem(ddp);
1351}
1352
1353int cxgbi_ddp_cleanup(struct cxgbi_device *cdev)
1354{
1355 struct cxgbi_ddp_info *ddp = cdev->ddp;
1356
1357 log_debug(1 << CXGBI_DBG_DDP,
1358 "cdev 0x%p, release ddp 0x%p.\n", cdev, ddp);
1359 cdev->ddp = NULL;
1360 if (ddp)
1361 return kref_put(&ddp->refcnt, ddp_destroy);
1362 return 0;
1363}
1364EXPORT_SYMBOL_GPL(cxgbi_ddp_cleanup);
1365
1366int cxgbi_ddp_init(struct cxgbi_device *cdev,
1367 unsigned int llimit, unsigned int ulimit,
1368 unsigned int max_txsz, unsigned int max_rxsz)
1369{
1370 struct cxgbi_ddp_info *ddp;
1371 unsigned int ppmax, bits;
1372
1373 ppmax = (ulimit - llimit + 1) >> PPOD_SIZE_SHIFT;
1374 bits = __ilog2_u32(ppmax) + 1;
1375 if (bits > PPOD_IDX_MAX_SIZE)
1376 bits = PPOD_IDX_MAX_SIZE;
1377 ppmax = (1 << (bits - 1)) - 1;
1378
1379 ddp = cxgbi_alloc_big_mem(sizeof(struct cxgbi_ddp_info) +
1380 ppmax * (sizeof(struct cxgbi_gather_list *) +
1381 sizeof(struct sk_buff *)),
1382 GFP_KERNEL);
1383 if (!ddp) {
1384 pr_warn("cdev 0x%p, ddp ppmax %u OOM.\n", cdev, ppmax);
1385 return -ENOMEM;
1386 }
1387 ddp->gl_map = (struct cxgbi_gather_list **)(ddp + 1);
9ba682f0 1388 cdev->ddp = ddp;
1389
1390 spin_lock_init(&ddp->map_lock);
1391 kref_init(&ddp->refcnt);
1392
1393 ddp->cdev = cdev;
1394 ddp->pdev = cdev->pdev;
1395 ddp->llimit = llimit;
1396 ddp->ulimit = ulimit;
1397 ddp->max_txsz = min_t(unsigned int, max_txsz, ULP2_MAX_PKT_SIZE);
1398 ddp->max_rxsz = min_t(unsigned int, max_rxsz, ULP2_MAX_PKT_SIZE);
1399 ddp->nppods = ppmax;
1400 ddp->idx_last = ppmax;
1401 ddp->idx_bits = bits;
1402 ddp->idx_mask = (1 << bits) - 1;
1403 ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1;
1404
1405 cdev->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
1406 cdev->tag_format.rsvd_bits = ddp->idx_bits;
1407 cdev->tag_format.rsvd_shift = PPOD_IDX_SHIFT;
1408 cdev->tag_format.rsvd_mask = (1 << cdev->tag_format.rsvd_bits) - 1;
1409
1410 pr_info("%s tag format, sw %u, rsvd %u,%u, mask 0x%x.\n",
1411 cdev->ports[0]->name, cdev->tag_format.sw_bits,
1412 cdev->tag_format.rsvd_bits, cdev->tag_format.rsvd_shift,
1413 cdev->tag_format.rsvd_mask);
1414
1415 cdev->tx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1416 ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
1417 cdev->rx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1418 ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);
1419
1420 log_debug(1 << CXGBI_DBG_DDP,
1421 "%s max payload size: %u/%u, %u/%u.\n",
1422 cdev->ports[0]->name, cdev->tx_max_size, ddp->max_txsz,
1423 cdev->rx_max_size, ddp->max_rxsz);
1424 return 0;
1425}
1426EXPORT_SYMBOL_GPL(cxgbi_ddp_init);
1427
1428/*
1429 * APIs interacting with open-iscsi libraries
1430 */
1431
1432static unsigned char padding[4];
1433
1434static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1435{
1436 struct scsi_cmnd *sc = task->sc;
1437 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1438 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1439 struct cxgbi_hba *chba = cconn->chba;
1440 struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1441 u32 tag = ntohl((__force u32)hdr_itt);
1442
1443 log_debug(1 << CXGBI_DBG_DDP,
1444 "cdev 0x%p, release tag 0x%x.\n", chba->cdev, tag);
1445 if (sc &&
1446 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
1447 cxgbi_is_ddp_tag(tformat, tag))
1448 ddp_tag_release(chba, tag);
1449}
1450
1451static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1452{
1453 struct scsi_cmnd *sc = task->sc;
1454 struct iscsi_conn *conn = task->conn;
1455 struct iscsi_session *sess = conn->session;
1456 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1457 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1458 struct cxgbi_hba *chba = cconn->chba;
1459 struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1460 u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
1461 u32 tag = 0;
1462 int err = -EINVAL;
1463
1464 if (sc &&
1465 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)) {
1466 err = cxgbi_ddp_reserve(cconn->cep->csk, &tag, sw_tag,
1467 scsi_in(sc)->length,
1468 scsi_in(sc)->table.sgl,
1469 scsi_in(sc)->table.nents,
1470 GFP_ATOMIC);
1471 if (err < 0)
1472 log_debug(1 << CXGBI_DBG_DDP,
1473 "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1474 cconn->cep->csk, task, scsi_in(sc)->length,
1475 scsi_in(sc)->table.nents);
1476 }
1477
1478 if (err < 0)
1479 tag = cxgbi_set_non_ddp_tag(tformat, sw_tag);
1480 /* the itt need to sent in big-endian order */
1481 *hdr_itt = (__force itt_t)htonl(tag);
1482
1483 log_debug(1 << CXGBI_DBG_DDP,
1484 "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1485 chba->cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1486 return 0;
1487}
1488
1489void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1490{
1491 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1492 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1493 struct cxgbi_device *cdev = cconn->chba->cdev;
1494 u32 tag = ntohl((__force u32) itt);
1495 u32 sw_bits;
1496
1497 sw_bits = cxgbi_tag_nonrsvd_bits(&cdev->tag_format, tag);
1498 if (idx)
1499 *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
1500 if (age)
1501 *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
1502
1503 log_debug(1 << CXGBI_DBG_DDP,
1504 "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1505 cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1506 age ? *age : 0xFF);
1507}
1508EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1509
1510void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1511{
1512 struct iscsi_conn *conn = csk->user_data;
1513
1514 if (conn) {
1515 log_debug(1 << CXGBI_DBG_SOCK,
1516 "csk 0x%p, cid %d.\n", csk, conn->id);
1517 iscsi_conn_queue_work(conn);
1518 }
1519}
1520EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1521
1522/*
1523 * pdu receive, interact with libiscsi_tcp
1524 */
1525static inline int read_pdu_skb(struct iscsi_conn *conn,
1526 struct sk_buff *skb,
1527 unsigned int offset,
1528 int offloaded)
1529{
1530 int status = 0;
1531 int bytes_read;
1532
1533 bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1534 switch (status) {
1535 case ISCSI_TCP_CONN_ERR:
1536 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1537 skb, offset, offloaded);
1538 return -EIO;
1539 case ISCSI_TCP_SUSPENDED:
1540 log_debug(1 << CXGBI_DBG_PDU_RX,
1541 "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1542 skb, offset, offloaded, bytes_read);
1543 /* no transfer - just have caller flush queue */
1544 return bytes_read;
1545 case ISCSI_TCP_SKB_DONE:
1546 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1547 skb, offset, offloaded);
1548 /*
1549 * pdus should always fit in the skb and we should get
1550 * segment done notifcation.
1551 */
1552 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1553 return -EFAULT;
1554 case ISCSI_TCP_SEGMENT_DONE:
1555 log_debug(1 << CXGBI_DBG_PDU_RX,
1556 "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1557 skb, offset, offloaded, bytes_read);
1558 return bytes_read;
1559 default:
1560 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1561 skb, offset, offloaded, status);
1562 return -EINVAL;
1563 }
1564}
1565
1566static int skb_read_pdu_bhs(struct iscsi_conn *conn, struct sk_buff *skb)
1567{
1568 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1569
1570 log_debug(1 << CXGBI_DBG_PDU_RX,
1571 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1572 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1573
1574 if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1575 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1576 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1577 return -EIO;
1578 }
1579
1580 if (conn->hdrdgst_en &&
1581 cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1582 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1583 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1584 return -EIO;
1585 }
1586
1587 return read_pdu_skb(conn, skb, 0, 0);
1588}
1589
1590static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1591 struct sk_buff *skb, unsigned int offset)
1592{
1593 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1594 bool offloaded = 0;
1595 int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1596
1597 log_debug(1 << CXGBI_DBG_PDU_RX,
1598 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1599 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1600
1601 if (conn->datadgst_en &&
1602 cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1603 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1604 conn, lskb, cxgbi_skcb_flags(lskb));
1605 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1606 return -EIO;
1607 }
1608
1609 if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1610 return 0;
1611
1612 /* coalesced, add header digest length */
1613 if (lskb == skb && conn->hdrdgst_en)
1614 offset += ISCSI_DIGEST_SIZE;
1615
1616 if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1617 offloaded = 1;
1618
1619 if (opcode == ISCSI_OP_SCSI_DATA_IN)
1620 log_debug(1 << CXGBI_DBG_PDU_RX,
1621 "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1622 skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1623 tcp_conn->in.datalen, offloaded ? "is" : "not");
1624
1625 return read_pdu_skb(conn, skb, offset, offloaded);
1626}
1627
1628static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1629{
1630 struct cxgbi_device *cdev = csk->cdev;
1631 int must_send;
1632 u32 credits;
1633
1634 log_debug(1 << CXGBI_DBG_PDU_RX,
1635 "csk 0x%p,%u,0x%lu,%u, seq %u, wup %u, thre %u, %u.\n",
1636 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1637 csk->rcv_wup, cdev->rx_credit_thres,
1638 cdev->rcv_win);
1639
1640 if (csk->state != CTP_ESTABLISHED)
1641 return;
1642
1643 credits = csk->copied_seq - csk->rcv_wup;
1644 if (unlikely(!credits))
1645 return;
1646 if (unlikely(cdev->rx_credit_thres == 0))
1647 return;
1648
1649 must_send = credits + 16384 >= cdev->rcv_win;
1650 if (must_send || credits >= cdev->rx_credit_thres)
1651 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1652}
1653
1654void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1655{
1656 struct cxgbi_device *cdev = csk->cdev;
1657 struct iscsi_conn *conn = csk->user_data;
1658 struct sk_buff *skb;
1659 unsigned int read = 0;
1660 int err = 0;
1661
1662 log_debug(1 << CXGBI_DBG_PDU_RX,
1663 "csk 0x%p, conn 0x%p.\n", csk, conn);
1664
1665 if (unlikely(!conn || conn->suspend_rx)) {
1666 log_debug(1 << CXGBI_DBG_PDU_RX,
1667 "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1668 csk, conn, conn ? conn->id : 0xFF,
1669 conn ? conn->suspend_rx : 0xFF);
9ba682f0 1670 return;
1671 }
1672
1673 while (!err) {
9ba682f0 1674 skb = skb_peek(&csk->receive_queue);
1675 if (!skb ||
1676 !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1677 if (skb)
1678 log_debug(1 << CXGBI_DBG_PDU_RX,
1679 "skb 0x%p, NOT ready 0x%lx.\n",
1680 skb, cxgbi_skcb_flags(skb));
9ba682f0 1681 break;
1682 }
1683 __skb_unlink(skb, &csk->receive_queue);
9ba682f0 1684
1685 read += cxgbi_skcb_rx_pdulen(skb);
1686 log_debug(1 << CXGBI_DBG_PDU_RX,
1687 "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1688 csk, skb, skb->len, cxgbi_skcb_flags(skb),
1689 cxgbi_skcb_rx_pdulen(skb));
1690
1691 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1692 err = skb_read_pdu_bhs(conn, skb);
e3d2ad8c 1693 if (err < 0) {
1694 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1695 "f 0x%lx, plen %u.\n",
1696 csk, skb, skb->len,
1697 cxgbi_skcb_flags(skb),
1698 cxgbi_skcb_rx_pdulen(skb));
1699 goto skb_done;
1700 }
9ba682f0 1701 err = skb_read_pdu_data(conn, skb, skb,
1702 err + cdev->skb_rx_extra);
e3d2ad8c 1703 if (err < 0)
1704 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1705 "f 0x%lx, plen %u.\n",
1706 csk, skb, skb->len,
1707 cxgbi_skcb_flags(skb),
1708 cxgbi_skcb_rx_pdulen(skb));
9ba682f0 1709 } else {
1710 err = skb_read_pdu_bhs(conn, skb);
e3d2ad8c 1711 if (err < 0) {
1712 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1713 "f 0x%lx, plen %u.\n",
1714 csk, skb, skb->len,
1715 cxgbi_skcb_flags(skb),
1716 cxgbi_skcb_rx_pdulen(skb));
1717 goto skb_done;
1718 }
1719
9ba682f0 1720 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1721 struct sk_buff *dskb;
1722
9ba682f0 1723 dskb = skb_peek(&csk->receive_queue);
1724 if (!dskb) {
e3d2ad8c 1725 pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1726 " plen %u, NO data.\n",
1727 csk, skb, skb->len,
1728 cxgbi_skcb_flags(skb),
1729 cxgbi_skcb_rx_pdulen(skb));
1730 err = -EIO;
1731 goto skb_done;
9ba682f0 1732 }
1733 __skb_unlink(dskb, &csk->receive_queue);
9ba682f0 1734
1735 err = skb_read_pdu_data(conn, skb, dskb, 0);
e3d2ad8c 1736 if (err < 0)
1737 pr_err("data, csk 0x%p, skb 0x%p,%u, "
1738 "f 0x%lx, plen %u, dskb 0x%p,"
1739 "%u.\n",
1740 csk, skb, skb->len,
1741 cxgbi_skcb_flags(skb),
1742 cxgbi_skcb_rx_pdulen(skb),
1743 dskb, dskb->len);
9ba682f0 1744 __kfree_skb(dskb);
1745 } else
1746 err = skb_read_pdu_data(conn, skb, skb, 0);
1747 }
e3d2ad8c 1748skb_done:
1749 __kfree_skb(skb);
1750
9ba682f0 1751 if (err < 0)
1752 break;
9ba682f0 1753 }
1754
1755 log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
1756 if (read) {
1757 csk->copied_seq += read;
1758 csk_return_rx_credits(csk, read);
1759 conn->rxdata_octets += read;
1760 }
1761
1762 if (err < 0) {
e3d2ad8c 1763 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
1764 csk, conn, err, read);
9ba682f0 1765 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1766 }
1767}
1768EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
1769
1770static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
1771 unsigned int offset, unsigned int *off,
1772 struct scatterlist **sgp)
1773{
1774 int i;
1775 struct scatterlist *sg;
1776
1777 for_each_sg(sgl, sg, sgcnt, i) {
1778 if (offset < sg->length) {
1779 *off = offset;
1780 *sgp = sg;
1781 return 0;
1782 }
1783 offset -= sg->length;
1784 }
1785 return -EFAULT;
1786}
1787
1788static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
1789 unsigned int dlen, skb_frag_t *frags,
1790 int frag_max)
1791{
1792 unsigned int datalen = dlen;
1793 unsigned int sglen = sg->length - sgoffset;
1794 struct page *page = sg_page(sg);
1795 int i;
1796
1797 i = 0;
1798 do {
1799 unsigned int copy;
1800
1801 if (!sglen) {
1802 sg = sg_next(sg);
1803 if (!sg) {
1804 pr_warn("sg %d NULL, len %u/%u.\n",
1805 i, datalen, dlen);
1806 return -EINVAL;
1807 }
1808 sgoffset = 0;
1809 sglen = sg->length;
1810 page = sg_page(sg);
1811
1812 }
1813 copy = min(datalen, sglen);
1814 if (i && page == frags[i - 1].page &&
1815 sgoffset + sg->offset ==
1816 frags[i - 1].page_offset + frags[i - 1].size) {
1817 frags[i - 1].size += copy;
1818 } else {
1819 if (i >= frag_max) {
1820 pr_warn("too many pages %u, dlen %u.\n",
1821 frag_max, dlen);
1822 return -EINVAL;
1823 }
1824
1825 frags[i].page = page;
1826 frags[i].page_offset = sg->offset + sgoffset;
1827 frags[i].size = copy;
1828 i++;
1829 }
1830 datalen -= copy;
1831 sgoffset += copy;
1832 sglen -= copy;
1833 } while (datalen);
1834
1835 return i;
1836}
1837
1838int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
1839{
1840 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1841 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1842 struct cxgbi_device *cdev = cconn->chba->cdev;
1843 struct iscsi_conn *conn = task->conn;
1844 struct iscsi_tcp_task *tcp_task = task->dd_data;
e3d2ad8c 1845 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
9ba682f0 1846 struct scsi_cmnd *sc = task->sc;
1847 int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
1848
1849 tcp_task->dd_data = tdata;
1850 task->hdr = NULL;
1851
1852 if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
1853 (opcode == ISCSI_OP_SCSI_DATA_OUT ||
1854 (opcode == ISCSI_OP_SCSI_CMD &&
1855 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
1856 /* data could goes into skb head */
1857 headroom += min_t(unsigned int,
1858 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
1859 conn->max_xmit_dlength);
1860
1861 tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
1862 if (!tdata->skb) {
1863 pr_warn("alloc skb %u+%u, opcode 0x%x failed.\n",
1864 cdev->skb_tx_rsvd, headroom, opcode);
1865 return -ENOMEM;
1866 }
1867
1868 skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
1869 task->hdr = (struct iscsi_hdr *)tdata->skb->data;
1870 task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
1871
1872 /* data_out uses scsi_cmd's itt */
1873 if (opcode != ISCSI_OP_SCSI_DATA_OUT)
1874 task_reserve_itt(task, &task->hdr->itt);
1875
1876 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1877 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
1878 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
1879 conn->max_xmit_dlength, ntohl(task->hdr->itt));
1880
1881 return 0;
1882}
1883EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
1884
1885static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
1886{
c343a01c 1887 if (hcrc || dcrc) {
1888 u8 submode = 0;
9ba682f0 1889
c343a01c 1890 if (hcrc)
1891 submode |= 1;
1892 if (dcrc)
1893 submode |= 2;
1894 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
1895 } else
1896 cxgbi_skcb_ulp_mode(skb) = 0;
9ba682f0 1897}
1898
1899int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
1900 unsigned int count)
1901{
1902 struct iscsi_conn *conn = task->conn;
e3d2ad8c 1903 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
9ba682f0 1904 struct sk_buff *skb = tdata->skb;
1905 unsigned int datalen = count;
1906 int i, padlen = iscsi_padding(count);
1907 struct page *pg;
1908
1909 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1910 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
1911 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
1912 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
1913
1914 skb_put(skb, task->hdr_len);
1915 tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
1916 if (!count)
1917 return 0;
1918
1919 if (task->sc) {
1920 struct scsi_data_buffer *sdb = scsi_out(task->sc);
1921 struct scatterlist *sg = NULL;
1922 int err;
1923
1924 tdata->offset = offset;
1925 tdata->count = count;
1926 err = sgl_seek_offset(
1927 sdb->table.sgl, sdb->table.nents,
1928 tdata->offset, &tdata->sgoffset, &sg);
1929 if (err < 0) {
1930 pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
1931 sdb->table.nents, tdata->offset, sdb->length);
1932 return err;
1933 }
1934 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
1935 tdata->frags, MAX_PDU_FRAGS);
1936 if (err < 0) {
1937 pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
1938 sdb->table.nents, tdata->offset, tdata->count);
1939 return err;
1940 }
1941 tdata->nr_frags = err;
1942
1943 if (tdata->nr_frags > MAX_SKB_FRAGS ||
1944 (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
1945 char *dst = skb->data + task->hdr_len;
1946 skb_frag_t *frag = tdata->frags;
1947
1948 /* data fits in the skb's headroom */
1949 for (i = 0; i < tdata->nr_frags; i++, frag++) {
1950 char *src = kmap_atomic(frag->page,
1951 KM_SOFTIRQ0);
1952
1953 memcpy(dst, src+frag->page_offset, frag->size);
1954 dst += frag->size;
1955 kunmap_atomic(src, KM_SOFTIRQ0);
1956 }
1957 if (padlen) {
1958 memset(dst, 0, padlen);
1959 padlen = 0;
1960 }
1961 skb_put(skb, count + padlen);
1962 } else {
1963 /* data fit into frag_list */
1964 for (i = 0; i < tdata->nr_frags; i++)
1965 get_page(tdata->frags[i].page);
1966
1967 memcpy(skb_shinfo(skb)->frags, tdata->frags,
1968 sizeof(skb_frag_t) * tdata->nr_frags);
1969 skb_shinfo(skb)->nr_frags = tdata->nr_frags;
1970 skb->len += count;
1971 skb->data_len += count;
1972 skb->truesize += count;
1973 }
1974
1975 } else {
1976 pg = virt_to_page(task->data);
1977
1978 get_page(pg);
1979 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
1980 count);
1981 skb->len += count;
1982 skb->data_len += count;
1983 skb->truesize += count;
1984 }
1985
1986 if (padlen) {
1987 i = skb_shinfo(skb)->nr_frags;
1988 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
1989 virt_to_page(padding), offset_in_page(padding),
1990 padlen);
1991
1992 skb->data_len += padlen;
1993 skb->truesize += padlen;
1994 skb->len += padlen;
1995 }
1996
1997 return 0;
1998}
1999EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
2000
2001int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2002{
2003 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2004 struct cxgbi_conn *cconn = tcp_conn->dd_data;
e3d2ad8c 2005 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
9ba682f0 2006 struct sk_buff *skb = tdata->skb;
2007 unsigned int datalen;
2008 int err;
2009
2010 if (!skb) {
2011 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2012 "task 0x%p, skb NULL.\n", task);
2013 return 0;
2014 }
2015
2016 datalen = skb->data_len;
2017 tdata->skb = NULL;
2018 err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2019 if (err > 0) {
2020 int pdulen = err;
2021
2022 log_debug(1 << CXGBI_DBG_PDU_TX,
2023 "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2024 task, task->sc, skb, skb->len, skb->data_len, err);
2025
2026 if (task->conn->hdrdgst_en)
2027 pdulen += ISCSI_DIGEST_SIZE;
2028
2029 if (datalen && task->conn->datadgst_en)
2030 pdulen += ISCSI_DIGEST_SIZE;
2031
2032 task->conn->txdata_octets += pdulen;
2033 return 0;
2034 }
2035
2036 if (err == -EAGAIN || err == -ENOBUFS) {
2037 log_debug(1 << CXGBI_DBG_PDU_TX,
2038 "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2039 task, skb, skb->len, skb->data_len, err);
2040 /* reset skb to send when we are called again */
2041 tdata->skb = skb;
2042 return err;
2043 }
2044
2045 kfree_skb(skb);
2046 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2047 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2048 task->itt, skb, skb->len, skb->data_len, err);
2049 iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2050 iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2051 return err;
2052}
2053EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2054
2055void cxgbi_cleanup_task(struct iscsi_task *task)
2056{
e3d2ad8c 2057 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
9ba682f0 2058
2059 log_debug(1 << CXGBI_DBG_ISCSI,
2060 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2061 task, tdata->skb, task->hdr_itt);
2062
2063 /* never reached the xmit task callout */
2064 if (tdata->skb)
2065 __kfree_skb(tdata->skb);
2066 memset(tdata, 0, sizeof(*tdata));
2067
2068 task_release_itt(task, task->hdr_itt);
2069 iscsi_tcp_cleanup_task(task);
2070}
2071EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2072
2073void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2074 struct iscsi_stats *stats)
2075{
2076 struct iscsi_conn *conn = cls_conn->dd_data;
2077
2078 stats->txdata_octets = conn->txdata_octets;
2079 stats->rxdata_octets = conn->rxdata_octets;
2080 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2081 stats->dataout_pdus = conn->dataout_pdus_cnt;
2082 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2083 stats->datain_pdus = conn->datain_pdus_cnt;
2084 stats->r2t_pdus = conn->r2t_pdus_cnt;
2085 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2086 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2087 stats->digest_err = 0;
2088 stats->timeout_err = 0;
2089 stats->custom_length = 1;
2090 strcpy(stats->custom[0].desc, "eh_abort_cnt");
2091 stats->custom[0].value = conn->eh_abort_cnt;
2092}
2093EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2094
2095static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2096{
2097 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2098 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2099 struct cxgbi_device *cdev = cconn->chba->cdev;
2100 unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2101 unsigned int max_def = 512 * MAX_SKB_FRAGS;
2102 unsigned int max = max(max_def, headroom);
2103
2104 max = min(cconn->chba->cdev->tx_max_size, max);
2105 if (conn->max_xmit_dlength)
2106 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2107 else
2108 conn->max_xmit_dlength = max;
2109 cxgbi_align_pdu_size(conn->max_xmit_dlength);
2110
2111 return 0;
2112}
2113
2114static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2115{
2116 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2117 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2118 unsigned int max = cconn->chba->cdev->rx_max_size;
2119
2120 cxgbi_align_pdu_size(max);
2121
2122 if (conn->max_recv_dlength) {
2123 if (conn->max_recv_dlength > max) {
2124 pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2125 conn->max_recv_dlength, max);
2126 return -EINVAL;
2127 }
2128 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2129 cxgbi_align_pdu_size(conn->max_recv_dlength);
2130 } else
2131 conn->max_recv_dlength = max;
2132
2133 return 0;
2134}
2135
2136int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2137 enum iscsi_param param, char *buf, int buflen)
2138{
2139 struct iscsi_conn *conn = cls_conn->dd_data;
2140 struct iscsi_session *session = conn->session;
2141 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2142 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2143 struct cxgbi_sock *csk = cconn->cep->csk;
2144 int value, err = 0;
2145
2146 log_debug(1 << CXGBI_DBG_ISCSI,
2147 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2148 cls_conn, param, buflen, buf);
2149
2150 switch (param) {
2151 case ISCSI_PARAM_HDRDGST_EN:
2152 err = iscsi_set_param(cls_conn, param, buf, buflen);
2153 if (!err && conn->hdrdgst_en)
2154 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2155 conn->hdrdgst_en,
2156 conn->datadgst_en, 0);
2157 break;
2158 case ISCSI_PARAM_DATADGST_EN:
2159 err = iscsi_set_param(cls_conn, param, buf, buflen);
2160 if (!err && conn->datadgst_en)
2161 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2162 conn->hdrdgst_en,
2163 conn->datadgst_en, 0);
2164 break;
2165 case ISCSI_PARAM_MAX_R2T:
2166 sscanf(buf, "%d", &value);
2167 if (value <= 0 || !is_power_of_2(value))
2168 return -EINVAL;
2169 if (session->max_r2t == value)
2170 break;
2171 iscsi_tcp_r2tpool_free(session);
2172 err = iscsi_set_param(cls_conn, param, buf, buflen);
2173 if (!err && iscsi_tcp_r2tpool_alloc(session))
2174 return -ENOMEM;
2175 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2176 err = iscsi_set_param(cls_conn, param, buf, buflen);
2177 if (!err)
2178 err = cxgbi_conn_max_recv_dlength(conn);
2179 break;
2180 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2181 err = iscsi_set_param(cls_conn, param, buf, buflen);
2182 if (!err)
2183 err = cxgbi_conn_max_xmit_dlength(conn);
2184 break;
2185 default:
2186 return iscsi_set_param(cls_conn, param, buf, buflen);
2187 }
2188 return err;
2189}
2190EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2191
c71b9b66
MC		 2192int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2193 char *buf)
9ba682f0 2194{
c71b9b66
MC		 2195 struct cxgbi_endpoint *cep = ep->dd_data;
2196 struct cxgbi_sock *csk;
9ba682f0 2197 int len;
2198
2199 log_debug(1 << CXGBI_DBG_ISCSI,
c71b9b66 2200 "cls_conn 0x%p, param %d.\n", ep, param);
9ba682f0 2201
2202 switch (param) {
2203 case ISCSI_PARAM_CONN_PORT:
9ba682f0 2204 case ISCSI_PARAM_CONN_ADDRESS:
c71b9b66
MC		 2205 if (!cep)
2206 return -ENOTCONN;
2207
2208 csk = cep->csk;
2209 if (!csk)
2210 return -ENOTCONN;
2211
2212 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2213 &csk->daddr, param, buf);
9ba682f0 2214 default:
c71b9b66 2215 return -ENOSYS;
9ba682f0 2216 }
2217 return len;
2218}
c71b9b66 2219EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
9ba682f0 2220
2221struct iscsi_cls_conn *
2222cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2223{
2224 struct iscsi_cls_conn *cls_conn;
2225 struct iscsi_conn *conn;
2226 struct iscsi_tcp_conn *tcp_conn;
2227 struct cxgbi_conn *cconn;
2228
2229 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2230 if (!cls_conn)
2231 return NULL;
2232
2233 conn = cls_conn->dd_data;
2234 tcp_conn = conn->dd_data;
2235 cconn = tcp_conn->dd_data;
2236 cconn->iconn = conn;
2237
2238 log_debug(1 << CXGBI_DBG_ISCSI,
2239 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2240 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2241
2242 return cls_conn;
2243}
2244EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2245
2246int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2247 struct iscsi_cls_conn *cls_conn,
2248 u64 transport_eph, int is_leading)
2249{
2250 struct iscsi_conn *conn = cls_conn->dd_data;
2251 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2252 struct cxgbi_conn *cconn = tcp_conn->dd_data;
2253 struct iscsi_endpoint *ep;
2254 struct cxgbi_endpoint *cep;
2255 struct cxgbi_sock *csk;
2256 int err;
2257
2258 ep = iscsi_lookup_endpoint(transport_eph);
2259 if (!ep)
2260 return -EINVAL;
2261
2262 /* setup ddp pagesize */
2263 cep = ep->dd_data;
2264 csk = cep->csk;
2265 err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid, page_idx, 0);
2266 if (err < 0)
2267 return err;
2268
2269 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2270 if (err)
2271 return -EINVAL;
2272
2273 /* calculate the tag idx bits needed for this conn based on cmds_max */
2274 cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2275
e3d2ad8c 2276 write_lock_bh(&csk->callback_lock);
9ba682f0 2277 csk->user_data = conn;
2278 cconn->chba = cep->chba;
2279 cconn->cep = cep;
2280 cep->cconn = cconn;
e3d2ad8c 2281 write_unlock_bh(&csk->callback_lock);
9ba682f0 2282
2283 cxgbi_conn_max_xmit_dlength(conn);
2284 cxgbi_conn_max_recv_dlength(conn);
2285
9ba682f0 2286 log_debug(1 << CXGBI_DBG_ISCSI,
2287 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2288 cls_session, cls_conn, ep, cconn, csk);
2289 /* init recv engine */
2290 iscsi_tcp_hdr_recv_prep(tcp_conn);
2291
2292 return 0;
2293}
2294EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2295
2296struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2297 u16 cmds_max, u16 qdepth,
2298 u32 initial_cmdsn)
2299{
2300 struct cxgbi_endpoint *cep;
2301 struct cxgbi_hba *chba;
2302 struct Scsi_Host *shost;
2303 struct iscsi_cls_session *cls_session;
2304 struct iscsi_session *session;
2305
2306 if (!ep) {
2307 pr_err("missing endpoint.\n");
2308 return NULL;
2309 }
2310
2311 cep = ep->dd_data;
2312 chba = cep->chba;
2313 shost = chba->shost;
2314
2315 BUG_ON(chba != iscsi_host_priv(shost));
2316
2317 cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2318 cmds_max, 0,
2319 sizeof(struct iscsi_tcp_task) +
2320 sizeof(struct cxgbi_task_data),
2321 initial_cmdsn, ISCSI_MAX_TARGET);
2322 if (!cls_session)
2323 return NULL;
2324
2325 session = cls_session->dd_data;
2326 if (iscsi_tcp_r2tpool_alloc(session))
2327 goto remove_session;
2328
2329 log_debug(1 << CXGBI_DBG_ISCSI,
2330 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2331 return cls_session;
2332
2333remove_session:
2334 iscsi_session_teardown(cls_session);
2335 return NULL;
2336}
2337EXPORT_SYMBOL_GPL(cxgbi_create_session);
2338
2339void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2340{
2341 log_debug(1 << CXGBI_DBG_ISCSI,
2342 "cls sess 0x%p.\n", cls_session);
2343
2344 iscsi_tcp_r2tpool_free(cls_session->dd_data);
2345 iscsi_session_teardown(cls_session);
2346}
2347EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2348
2349int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2350 char *buf, int buflen)
2351{
2352 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2353
2354 if (!chba->ndev) {
2355 shost_printk(KERN_ERR, shost, "Could not get host param. "
2356 "netdev for host not set.\n");
2357 return -ENODEV;
2358 }
2359
2360 log_debug(1 << CXGBI_DBG_ISCSI,
2361 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2362 shost, chba, chba->ndev->name, param, buflen, buf);
2363
2364 switch (param) {
2365 case ISCSI_HOST_PARAM_IPADDRESS:
2366 {
2367 __be32 addr = in_aton(buf);
2368 log_debug(1 << CXGBI_DBG_ISCSI,
2369 "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2370 cxgbi_set_iscsi_ipv4(chba, addr);
2371 return 0;
2372 }
2373 case ISCSI_HOST_PARAM_HWADDRESS:
2374 case ISCSI_HOST_PARAM_NETDEV_NAME:
2375 return 0;
2376 default:
2377 return iscsi_host_set_param(shost, param, buf, buflen);
2378 }
2379}
2380EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2381
2382int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2383 char *buf)
2384{
2385 struct cxgbi_hba *chba = iscsi_host_priv(shost);
2386 int len = 0;
2387
2388 if (!chba->ndev) {
2389 shost_printk(KERN_ERR, shost, "Could not get host param. "
2390 "netdev for host not set.\n");
2391 return -ENODEV;
2392 }
2393
2394 log_debug(1 << CXGBI_DBG_ISCSI,
2395 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2396 shost, chba, chba->ndev->name, param);
2397
2398 switch (param) {
2399 case ISCSI_HOST_PARAM_HWADDRESS:
2400 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2401 break;
2402 case ISCSI_HOST_PARAM_NETDEV_NAME:
2403 len = sprintf(buf, "%s\n", chba->ndev->name);
2404 break;
2405 case ISCSI_HOST_PARAM_IPADDRESS:
2406 {
2407 __be32 addr;
2408
2409 addr = cxgbi_get_iscsi_ipv4(chba);
2410 len = sprintf(buf, "%pI4", &addr);
2411 log_debug(1 << CXGBI_DBG_ISCSI,
2412 "hba %s, ipv4 %pI4.\n", chba->ndev->name, &addr);
2413 break;
2414 }
2415 default:
2416 return iscsi_host_get_param(shost, param, buf);
2417 }
2418
2419 return len;
2420}
2421EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2422
2423struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2424 struct sockaddr *dst_addr,
2425 int non_blocking)
2426{
2427 struct iscsi_endpoint *ep;
2428 struct cxgbi_endpoint *cep;
2429 struct cxgbi_hba *hba = NULL;
2430 struct cxgbi_sock *csk;
2431 int err = -EINVAL;
2432
2433 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2434 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2435 shost, non_blocking, dst_addr);
2436
2437 if (shost) {
2438 hba = iscsi_host_priv(shost);
2439 if (!hba) {
2440 pr_info("shost 0x%p, priv NULL.\n", shost);
2441 goto err_out;
2442 }
2443 }
2444
2445 csk = cxgbi_check_route(dst_addr);
2446 if (IS_ERR(csk))
2447 return (struct iscsi_endpoint *)csk;
2448 cxgbi_sock_get(csk);
2449
2450 if (!hba)
2451 hba = csk->cdev->hbas[csk->port_id];
2452 else if (hba != csk->cdev->hbas[csk->port_id]) {
2453 pr_info("Could not connect through requested host %u"
2454 "hba 0x%p != 0x%p (%u).\n",
2455 shost->host_no, hba,
2456 csk->cdev->hbas[csk->port_id], csk->port_id);
2457 err = -ENOSPC;
2458 goto release_conn;
2459 }
2460
2461 err = sock_get_port(csk);
2462 if (err)
2463 goto release_conn;
2464
2465 cxgbi_sock_set_state(csk, CTP_CONNECTING);
2466 err = csk->cdev->csk_init_act_open(csk);
2467 if (err)
2468 goto release_conn;
2469
2470 if (cxgbi_sock_is_closing(csk)) {
2471 err = -ENOSPC;
2472 pr_info("csk 0x%p is closing.\n", csk);
2473 goto release_conn;
2474 }
2475
2476 ep = iscsi_create_endpoint(sizeof(*cep));
2477 if (!ep) {
2478 err = -ENOMEM;
2479 pr_info("iscsi alloc ep, OOM.\n");
2480 goto release_conn;
2481 }
2482
2483 cep = ep->dd_data;
2484 cep->csk = csk;
2485 cep->chba = hba;
2486
2487 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2488 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2489 ep, cep, csk, hba, hba->ndev->name);
2490 return ep;
2491
2492release_conn:
2493 cxgbi_sock_put(csk);
2494 cxgbi_sock_closed(csk);
2495err_out:
2496 return ERR_PTR(err);
2497}
2498EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2499
2500int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2501{
2502 struct cxgbi_endpoint *cep = ep->dd_data;
2503 struct cxgbi_sock *csk = cep->csk;
2504
2505 if (!cxgbi_sock_is_established(csk))
2506 return 0;
2507 return 1;
2508}
2509EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2510
2511void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2512{
2513 struct cxgbi_endpoint *cep = ep->dd_data;
2514 struct cxgbi_conn *cconn = cep->cconn;
2515 struct cxgbi_sock *csk = cep->csk;
2516
2517 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2518 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2519 ep, cep, cconn, csk, csk->state, csk->flags);
2520
2521 if (cconn && cconn->iconn) {
2522 iscsi_suspend_tx(cconn->iconn);
2523 write_lock_bh(&csk->callback_lock);
2524 cep->csk->user_data = NULL;
2525 cconn->cep = NULL;
2526 write_unlock_bh(&csk->callback_lock);
2527 }
2528 iscsi_destroy_endpoint(ep);
2529
2530 if (likely(csk->state >= CTP_ESTABLISHED))
2531 need_active_close(csk);
2532 else
2533 cxgbi_sock_closed(csk);
2534
2535 cxgbi_sock_put(csk);
2536}
2537EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2538
2539int cxgbi_iscsi_init(struct iscsi_transport *itp,
2540 struct scsi_transport_template **stt)
2541{
2542 *stt = iscsi_register_transport(itp);
2543 if (*stt == NULL) {
2544 pr_err("unable to register %s transport 0x%p.\n",
2545 itp->name, itp);
2546 return -ENODEV;
2547 }
2548 log_debug(1 << CXGBI_DBG_ISCSI,
2549 "%s, registered iscsi transport 0x%p.\n",
2550 itp->name, stt);
2551 return 0;
2552}
2553EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2554
2555void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2556 struct scsi_transport_template **stt)
2557{
2558 if (*stt) {
2559 log_debug(1 << CXGBI_DBG_ISCSI,
2560 "de-register transport 0x%p, %s, stt 0x%p.\n",
2561 itp, itp->name, *stt);
2562 *stt = NULL;
2563 iscsi_unregister_transport(itp);
2564 }
2565}
2566EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2567
2568static int __init libcxgbi_init_module(void)
2569{
2570 sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
2571 sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
2572
2573 pr_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
2574 ISCSI_ITT_MASK, sw_tag_idx_bits,
2575 ISCSI_AGE_MASK, sw_tag_age_bits);
2576
2577 ddp_setup_host_page_size();
2578 return 0;
2579}
2580
2581static void __exit libcxgbi_exit_module(void)
2582{
2583 cxgbi_device_unregister_all(0xFF);
2584 return;
2585}
2586
2587module_init(libcxgbi_init_module);
2588module_exit(libcxgbi_exit_module);
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