/drivers/scsi/cxgbi/libcxgbi.c
C | 2589 lines | 2152 code | 359 blank | 78 comment | 304 complexity | 9b8f6356fcf2ed7b2a330a5a1dd05e39 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
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1/*
2 * libcxgbi.c: Chelsio common library for T3/T4 iSCSI driver.
3 *
4 * Copyright (c) 2010 Chelsio Communications, Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation.
9 *
10 * Written by: Karen Xie (kxie@chelsio.com)
11 * Written by: Rakesh Ranjan (rranjan@chelsio.com)
12 */
13
14#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
15
16#include <linux/skbuff.h>
17#include <linux/crypto.h>
18#include <linux/scatterlist.h>
19#include <linux/pci.h>
20#include <scsi/scsi.h>
21#include <scsi/scsi_cmnd.h>
22#include <scsi/scsi_host.h>
23#include <linux/if_vlan.h>
24#include <linux/inet.h>
25#include <net/dst.h>
26#include <net/route.h>
27#include <linux/inetdevice.h> /* ip_dev_find */
28#include <net/tcp.h>
29
30static unsigned int dbg_level;
31
32#include "libcxgbi.h"
33
34#define DRV_MODULE_NAME "libcxgbi"
35#define DRV_MODULE_DESC "Chelsio iSCSI driver library"
36#define DRV_MODULE_VERSION "0.9.0"
37#define DRV_MODULE_RELDATE "Jun. 2010"
38
39MODULE_AUTHOR("Chelsio Communications, Inc.");
40MODULE_DESCRIPTION(DRV_MODULE_DESC);
41MODULE_VERSION(DRV_MODULE_VERSION);
42MODULE_LICENSE("GPL");
43
44module_param(dbg_level, uint, 0644);
45MODULE_PARM_DESC(dbg_level, "libiscsi debug level (default=0)");
46
47
48/*
49 * cxgbi device management
50 * maintains a list of the cxgbi devices
51 */
52static LIST_HEAD(cdev_list);
53static DEFINE_MUTEX(cdev_mutex);
54
55int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
56 unsigned int max_conn)
57{
58 struct cxgbi_ports_map *pmap = &cdev->pmap;
59
60 pmap->port_csk = cxgbi_alloc_big_mem(max_conn *
61 sizeof(struct cxgbi_sock *),
62 GFP_KERNEL);
63 if (!pmap->port_csk) {
64 pr_warn("cdev 0x%p, portmap OOM %u.\n", cdev, max_conn);
65 return -ENOMEM;
66 }
67
68 pmap->max_connect = max_conn;
69 pmap->sport_base = base;
70 spin_lock_init(&pmap->lock);
71 return 0;
72}
73EXPORT_SYMBOL_GPL(cxgbi_device_portmap_create);
74
75void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev)
76{
77 struct cxgbi_ports_map *pmap = &cdev->pmap;
78 struct cxgbi_sock *csk;
79 int i;
80
81 for (i = 0; i < pmap->max_connect; i++) {
82 if (pmap->port_csk[i]) {
83 csk = pmap->port_csk[i];
84 pmap->port_csk[i] = NULL;
85 log_debug(1 << CXGBI_DBG_SOCK,
86 "csk 0x%p, cdev 0x%p, offload down.\n",
87 csk, cdev);
88 spin_lock_bh(&csk->lock);
89 cxgbi_sock_set_flag(csk, CTPF_OFFLOAD_DOWN);
90 cxgbi_sock_closed(csk);
91 spin_unlock_bh(&csk->lock);
92 cxgbi_sock_put(csk);
93 }
94 }
95}
96EXPORT_SYMBOL_GPL(cxgbi_device_portmap_cleanup);
97
98static inline void cxgbi_device_destroy(struct cxgbi_device *cdev)
99{
100 log_debug(1 << CXGBI_DBG_DEV,
101 "cdev 0x%p, p# %u.\n", cdev, cdev->nports);
102 cxgbi_hbas_remove(cdev);
103 cxgbi_device_portmap_cleanup(cdev);
104 if (cdev->dev_ddp_cleanup)
105 cdev->dev_ddp_cleanup(cdev);
106 else
107 cxgbi_ddp_cleanup(cdev);
108 if (cdev->ddp)
109 cxgbi_ddp_cleanup(cdev);
110 if (cdev->pmap.max_connect)
111 cxgbi_free_big_mem(cdev->pmap.port_csk);
112 kfree(cdev);
113}
114
115struct cxgbi_device *cxgbi_device_register(unsigned int extra,
116 unsigned int nports)
117{
118 struct cxgbi_device *cdev;
119
120 cdev = kzalloc(sizeof(*cdev) + extra + nports *
121 (sizeof(struct cxgbi_hba *) +
122 sizeof(struct net_device *)),
123 GFP_KERNEL);
124 if (!cdev) {
125 pr_warn("nport %d, OOM.\n", nports);
126 return NULL;
127 }
128 cdev->ports = (struct net_device **)(cdev + 1);
129 cdev->hbas = (struct cxgbi_hba **)(((char*)cdev->ports) + nports *
130 sizeof(struct net_device *));
131 if (extra)
132 cdev->dd_data = ((char *)cdev->hbas) +
133 nports * sizeof(struct cxgbi_hba *);
134 spin_lock_init(&cdev->pmap.lock);
135
136 mutex_lock(&cdev_mutex);
137 list_add_tail(&cdev->list_head, &cdev_list);
138 mutex_unlock(&cdev_mutex);
139
140 log_debug(1 << CXGBI_DBG_DEV,
141 "cdev 0x%p, p# %u.\n", cdev, nports);
142 return cdev;
143}
144EXPORT_SYMBOL_GPL(cxgbi_device_register);
145
146void cxgbi_device_unregister(struct cxgbi_device *cdev)
147{
148 log_debug(1 << CXGBI_DBG_DEV,
149 "cdev 0x%p, p# %u,%s.\n",
150 cdev, cdev->nports, cdev->nports ? cdev->ports[0]->name : "");
151 mutex_lock(&cdev_mutex);
152 list_del(&cdev->list_head);
153 mutex_unlock(&cdev_mutex);
154 cxgbi_device_destroy(cdev);
155}
156EXPORT_SYMBOL_GPL(cxgbi_device_unregister);
157
158void cxgbi_device_unregister_all(unsigned int flag)
159{
160 struct cxgbi_device *cdev, *tmp;
161
162 mutex_lock(&cdev_mutex);
163 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
164 if ((cdev->flags & flag) == flag) {
165 log_debug(1 << CXGBI_DBG_DEV,
166 "cdev 0x%p, p# %u,%s.\n",
167 cdev, cdev->nports, cdev->nports ?
168 cdev->ports[0]->name : "");
169 list_del(&cdev->list_head);
170 cxgbi_device_destroy(cdev);
171 }
172 }
173 mutex_unlock(&cdev_mutex);
174}
175EXPORT_SYMBOL_GPL(cxgbi_device_unregister_all);
176
177struct cxgbi_device *cxgbi_device_find_by_lldev(void *lldev)
178{
179 struct cxgbi_device *cdev, *tmp;
180
181 mutex_lock(&cdev_mutex);
182 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
183 if (cdev->lldev == lldev) {
184 mutex_unlock(&cdev_mutex);
185 return cdev;
186 }
187 }
188 mutex_unlock(&cdev_mutex);
189 log_debug(1 << CXGBI_DBG_DEV,
190 "lldev 0x%p, NO match found.\n", lldev);
191 return NULL;
192}
193EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev);
194
195static struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev,
196 int *port)
197{
198 struct net_device *vdev = NULL;
199 struct cxgbi_device *cdev, *tmp;
200 int i;
201
202 if (ndev->priv_flags & IFF_802_1Q_VLAN) {
203 vdev = ndev;
204 ndev = vlan_dev_real_dev(ndev);
205 log_debug(1 << CXGBI_DBG_DEV,
206 "vlan dev %s -> %s.\n", vdev->name, ndev->name);
207 }
208
209 mutex_lock(&cdev_mutex);
210 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
211 for (i = 0; i < cdev->nports; i++) {
212 if (ndev == cdev->ports[i]) {
213 cdev->hbas[i]->vdev = vdev;
214 mutex_unlock(&cdev_mutex);
215 if (port)
216 *port = i;
217 return cdev;
218 }
219 }
220 }
221 mutex_unlock(&cdev_mutex);
222 log_debug(1 << CXGBI_DBG_DEV,
223 "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
224 return NULL;
225}
226
227void cxgbi_hbas_remove(struct cxgbi_device *cdev)
228{
229 int i;
230 struct cxgbi_hba *chba;
231
232 log_debug(1 << CXGBI_DBG_DEV,
233 "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
234
235 for (i = 0; i < cdev->nports; i++) {
236 chba = cdev->hbas[i];
237 if (chba) {
238 cdev->hbas[i] = NULL;
239 iscsi_host_remove(chba->shost);
240 pci_dev_put(cdev->pdev);
241 iscsi_host_free(chba->shost);
242 }
243 }
244}
245EXPORT_SYMBOL_GPL(cxgbi_hbas_remove);
246
247int cxgbi_hbas_add(struct cxgbi_device *cdev, unsigned int max_lun,
248 unsigned int max_id, struct scsi_host_template *sht,
249 struct scsi_transport_template *stt)
250{
251 struct cxgbi_hba *chba;
252 struct Scsi_Host *shost;
253 int i, err;
254
255 log_debug(1 << CXGBI_DBG_DEV, "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
256
257 for (i = 0; i < cdev->nports; i++) {
258 shost = iscsi_host_alloc(sht, sizeof(*chba), 1);
259 if (!shost) {
260 pr_info("0x%p, p%d, %s, host alloc failed.\n",
261 cdev, i, cdev->ports[i]->name);
262 err = -ENOMEM;
263 goto err_out;
264 }
265
266 shost->transportt = stt;
267 shost->max_lun = max_lun;
268 shost->max_id = max_id;
269 shost->max_channel = 0;
270 shost->max_cmd_len = 16;
271
272 chba = iscsi_host_priv(shost);
273 chba->cdev = cdev;
274 chba->ndev = cdev->ports[i];
275 chba->shost = shost;
276
277 log_debug(1 << CXGBI_DBG_DEV,
278 "cdev 0x%p, p#%d %s: chba 0x%p.\n",
279 cdev, i, cdev->ports[i]->name, chba);
280
281 pci_dev_get(cdev->pdev);
282 err = iscsi_host_add(shost, &cdev->pdev->dev);
283 if (err) {
284 pr_info("cdev 0x%p, p#%d %s, host add failed.\n",
285 cdev, i, cdev->ports[i]->name);
286 pci_dev_put(cdev->pdev);
287 scsi_host_put(shost);
288 goto err_out;
289 }
290
291 cdev->hbas[i] = chba;
292 }
293
294 return 0;
295
296err_out:
297 cxgbi_hbas_remove(cdev);
298 return err;
299}
300EXPORT_SYMBOL_GPL(cxgbi_hbas_add);
301
302/*
303 * iSCSI offload
304 *
305 * - source port management
306 * To find a free source port in the port allocation map we use a very simple
307 * rotor scheme to look for the next free port.
308 *
309 * If a source port has been specified make sure that it doesn't collide with
310 * our normal source port allocation map. If it's outside the range of our
311 * allocation/deallocation scheme just let them use it.
312 *
313 * If the source port is outside our allocation range, the caller is
314 * responsible for keeping track of their port usage.
315 */
316static int sock_get_port(struct cxgbi_sock *csk)
317{
318 struct cxgbi_device *cdev = csk->cdev;
319 struct cxgbi_ports_map *pmap = &cdev->pmap;
320 unsigned int start;
321 int idx;
322
323 if (!pmap->max_connect) {
324 pr_err("cdev 0x%p, p#%u %s, NO port map.\n",
325 cdev, csk->port_id, cdev->ports[csk->port_id]->name);
326 return -EADDRNOTAVAIL;
327 }
328
329 if (csk->saddr.sin_port) {
330 pr_err("source port NON-ZERO %u.\n",
331 ntohs(csk->saddr.sin_port));
332 return -EADDRINUSE;
333 }
334
335 spin_lock_bh(&pmap->lock);
336 if (pmap->used >= pmap->max_connect) {
337 spin_unlock_bh(&pmap->lock);
338 pr_info("cdev 0x%p, p#%u %s, ALL ports used.\n",
339 cdev, csk->port_id, cdev->ports[csk->port_id]->name);
340 return -EADDRNOTAVAIL;
341 }
342
343 start = idx = pmap->next;
344 do {
345 if (++idx >= pmap->max_connect)
346 idx = 0;
347 if (!pmap->port_csk[idx]) {
348 pmap->used++;
349 csk->saddr.sin_port =
350 htons(pmap->sport_base + idx);
351 pmap->next = idx;
352 pmap->port_csk[idx] = csk;
353 spin_unlock_bh(&pmap->lock);
354 cxgbi_sock_get(csk);
355 log_debug(1 << CXGBI_DBG_SOCK,
356 "cdev 0x%p, p#%u %s, p %u, %u.\n",
357 cdev, csk->port_id,
358 cdev->ports[csk->port_id]->name,
359 pmap->sport_base + idx, pmap->next);
360 return 0;
361 }
362 } while (idx != start);
363 spin_unlock_bh(&pmap->lock);
364
365 /* should not happen */
366 pr_warn("cdev 0x%p, p#%u %s, next %u?\n",
367 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
368 pmap->next);
369 return -EADDRNOTAVAIL;
370}
371
372static void sock_put_port(struct cxgbi_sock *csk)
373{
374 struct cxgbi_device *cdev = csk->cdev;
375 struct cxgbi_ports_map *pmap = &cdev->pmap;
376
377 if (csk->saddr.sin_port) {
378 int idx = ntohs(csk->saddr.sin_port) - pmap->sport_base;
379
380 csk->saddr.sin_port = 0;
381 if (idx < 0 || idx >= pmap->max_connect) {
382 pr_err("cdev 0x%p, p#%u %s, port %u OOR.\n",
383 cdev, csk->port_id,
384 cdev->ports[csk->port_id]->name,
385 ntohs(csk->saddr.sin_port));
386 return;
387 }
388
389 spin_lock_bh(&pmap->lock);
390 pmap->port_csk[idx] = NULL;
391 pmap->used--;
392 spin_unlock_bh(&pmap->lock);
393
394 log_debug(1 << CXGBI_DBG_SOCK,
395 "cdev 0x%p, p#%u %s, release %u.\n",
396 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
397 pmap->sport_base + idx);
398
399 cxgbi_sock_put(csk);
400 }
401}
402
403/*
404 * iscsi tcp connection
405 */
406void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *csk)
407{
408 if (csk->cpl_close) {
409 kfree_skb(csk->cpl_close);
410 csk->cpl_close = NULL;
411 }
412 if (csk->cpl_abort_req) {
413 kfree_skb(csk->cpl_abort_req);
414 csk->cpl_abort_req = NULL;
415 }
416 if (csk->cpl_abort_rpl) {
417 kfree_skb(csk->cpl_abort_rpl);
418 csk->cpl_abort_rpl = NULL;
419 }
420}
421EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs);
422
423static struct cxgbi_sock *cxgbi_sock_create(struct cxgbi_device *cdev)
424{
425 struct cxgbi_sock *csk = kzalloc(sizeof(*csk), GFP_NOIO);
426
427 if (!csk) {
428 pr_info("alloc csk %zu failed.\n", sizeof(*csk));
429 return NULL;
430 }
431
432 if (cdev->csk_alloc_cpls(csk) < 0) {
433 pr_info("csk 0x%p, alloc cpls failed.\n", csk);
434 kfree(csk);
435 return NULL;
436 }
437
438 spin_lock_init(&csk->lock);
439 kref_init(&csk->refcnt);
440 skb_queue_head_init(&csk->receive_queue);
441 skb_queue_head_init(&csk->write_queue);
442 setup_timer(&csk->retry_timer, NULL, (unsigned long)csk);
443 rwlock_init(&csk->callback_lock);
444 csk->cdev = cdev;
445 csk->flags = 0;
446 cxgbi_sock_set_state(csk, CTP_CLOSED);
447
448 log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk);
449
450 return csk;
451}
452
453static struct rtable *find_route_ipv4(struct flowi4 *fl4,
454 __be32 saddr, __be32 daddr,
455 __be16 sport, __be16 dport, u8 tos)
456{
457 struct rtable *rt;
458
459 rt = ip_route_output_ports(&init_net, fl4, NULL, daddr, saddr,
460 dport, sport, IPPROTO_TCP, tos, 0);
461 if (IS_ERR(rt))
462 return NULL;
463
464 return rt;
465}
466
467static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr)
468{
469 struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
470 struct dst_entry *dst;
471 struct net_device *ndev;
472 struct cxgbi_device *cdev;
473 struct rtable *rt = NULL;
474 struct flowi4 fl4;
475 struct cxgbi_sock *csk = NULL;
476 unsigned int mtu = 0;
477 int port = 0xFFFF;
478 int err = 0;
479
480 if (daddr->sin_family != AF_INET) {
481 pr_info("address family 0x%x NOT supported.\n",
482 daddr->sin_family);
483 err = -EAFNOSUPPORT;
484 goto err_out;
485 }
486
487 rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0, daddr->sin_port, 0);
488 if (!rt) {
489 pr_info("no route to ipv4 0x%x, port %u.\n",
490 daddr->sin_addr.s_addr, daddr->sin_port);
491 err = -ENETUNREACH;
492 goto err_out;
493 }
494 dst = &rt->dst;
495 ndev = dst_get_neighbour(dst)->dev;
496
497 if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
498 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
499 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
500 ndev->name);
501 err = -ENETUNREACH;
502 goto rel_rt;
503 }
504
505 if (ndev->flags & IFF_LOOPBACK) {
506 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
507 mtu = ndev->mtu;
508 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
509 dst_get_neighbour(dst)->dev->name, ndev->name, mtu);
510 }
511
512 cdev = cxgbi_device_find_by_netdev(ndev, &port);
513 if (!cdev) {
514 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
515 &daddr->sin_addr.s_addr, ndev->name);
516 err = -ENETUNREACH;
517 goto rel_rt;
518 }
519 log_debug(1 << CXGBI_DBG_SOCK,
520 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
521 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
522 port, ndev->name, cdev);
523
524 csk = cxgbi_sock_create(cdev);
525 if (!csk) {
526 err = -ENOMEM;
527 goto rel_rt;
528 }
529 csk->cdev = cdev;
530 csk->port_id = port;
531 csk->mtu = mtu;
532 csk->dst = dst;
533 csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
534 csk->daddr.sin_port = daddr->sin_port;
535 csk->daddr.sin_family = daddr->sin_family;
536 csk->saddr.sin_addr.s_addr = fl4.saddr;
537
538 return csk;
539
540rel_rt:
541 ip_rt_put(rt);
542 if (csk)
543 cxgbi_sock_closed(csk);
544err_out:
545 return ERR_PTR(err);
546}
547
548void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
549 unsigned int opt)
550{
551 csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
552 dst_confirm(csk->dst);
553 smp_mb();
554 cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
555}
556EXPORT_SYMBOL_GPL(cxgbi_sock_established);
557
558static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
559{
560 log_debug(1 << CXGBI_DBG_SOCK,
561 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
562 csk, csk->state, csk->flags, csk->user_data);
563
564 if (csk->state != CTP_ESTABLISHED) {
565 read_lock_bh(&csk->callback_lock);
566 if (csk->user_data)
567 iscsi_conn_failure(csk->user_data,
568 ISCSI_ERR_CONN_FAILED);
569 read_unlock_bh(&csk->callback_lock);
570 }
571}
572
573void cxgbi_sock_closed(struct cxgbi_sock *csk)
574{
575 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
576 csk, (csk)->state, (csk)->flags, (csk)->tid);
577 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
578 if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
579 return;
580 if (csk->saddr.sin_port)
581 sock_put_port(csk);
582 if (csk->dst)
583 dst_release(csk->dst);
584 csk->cdev->csk_release_offload_resources(csk);
585 cxgbi_sock_set_state(csk, CTP_CLOSED);
586 cxgbi_inform_iscsi_conn_closing(csk);
587 cxgbi_sock_put(csk);
588}
589EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
590
591static void need_active_close(struct cxgbi_sock *csk)
592{
593 int data_lost;
594 int close_req = 0;
595
596 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
597 csk, (csk)->state, (csk)->flags, (csk)->tid);
598 spin_lock_bh(&csk->lock);
599 dst_confirm(csk->dst);
600 data_lost = skb_queue_len(&csk->receive_queue);
601 __skb_queue_purge(&csk->receive_queue);
602
603 if (csk->state == CTP_ACTIVE_OPEN)
604 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
605 else if (csk->state == CTP_ESTABLISHED) {
606 close_req = 1;
607 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
608 } else if (csk->state == CTP_PASSIVE_CLOSE) {
609 close_req = 1;
610 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
611 }
612
613 if (close_req) {
614 if (data_lost)
615 csk->cdev->csk_send_abort_req(csk);
616 else
617 csk->cdev->csk_send_close_req(csk);
618 }
619
620 spin_unlock_bh(&csk->lock);
621}
622
623void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
624{
625 pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
626 csk, csk->state, csk->flags,
627 &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
628 &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
629 errno);
630
631 cxgbi_sock_set_state(csk, CTP_CONNECTING);
632 csk->err = errno;
633 cxgbi_sock_closed(csk);
634}
635EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
636
637void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
638{
639 struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
640
641 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
642 csk, (csk)->state, (csk)->flags, (csk)->tid);
643 cxgbi_sock_get(csk);
644 spin_lock_bh(&csk->lock);
645 if (csk->state == CTP_ACTIVE_OPEN)
646 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
647 spin_unlock_bh(&csk->lock);
648 cxgbi_sock_put(csk);
649 __kfree_skb(skb);
650}
651EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
652
653void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
654{
655 cxgbi_sock_get(csk);
656 spin_lock_bh(&csk->lock);
657 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
658 if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_RCVD))
659 cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
660 else {
661 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_RCVD);
662 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
663 if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
664 pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
665 csk, csk->state, csk->flags, csk->tid);
666 cxgbi_sock_closed(csk);
667 }
668 }
669 spin_unlock_bh(&csk->lock);
670 cxgbi_sock_put(csk);
671}
672EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
673
674void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
675{
676 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
677 csk, (csk)->state, (csk)->flags, (csk)->tid);
678 cxgbi_sock_get(csk);
679 spin_lock_bh(&csk->lock);
680
681 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
682 goto done;
683
684 switch (csk->state) {
685 case CTP_ESTABLISHED:
686 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
687 break;
688 case CTP_ACTIVE_CLOSE:
689 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
690 break;
691 case CTP_CLOSE_WAIT_1:
692 cxgbi_sock_closed(csk);
693 break;
694 case CTP_ABORTING:
695 break;
696 default:
697 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
698 csk, csk->state, csk->flags, csk->tid);
699 }
700 cxgbi_inform_iscsi_conn_closing(csk);
701done:
702 spin_unlock_bh(&csk->lock);
703 cxgbi_sock_put(csk);
704}
705EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
706
707void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
708{
709 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
710 csk, (csk)->state, (csk)->flags, (csk)->tid);
711 cxgbi_sock_get(csk);
712 spin_lock_bh(&csk->lock);
713
714 csk->snd_una = snd_nxt - 1;
715 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
716 goto done;
717
718 switch (csk->state) {
719 case CTP_ACTIVE_CLOSE:
720 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
721 break;
722 case CTP_CLOSE_WAIT_1:
723 case CTP_CLOSE_WAIT_2:
724 cxgbi_sock_closed(csk);
725 break;
726 case CTP_ABORTING:
727 break;
728 default:
729 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
730 csk, csk->state, csk->flags, csk->tid);
731 }
732done:
733 spin_unlock_bh(&csk->lock);
734 cxgbi_sock_put(csk);
735}
736EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
737
738void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
739 unsigned int snd_una, int seq_chk)
740{
741 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
742 "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
743 csk, csk->state, csk->flags, csk->tid, credits,
744 csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
745
746 spin_lock_bh(&csk->lock);
747
748 csk->wr_cred += credits;
749 if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
750 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
751
752 while (credits) {
753 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
754
755 if (unlikely(!p)) {
756 pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
757 csk, csk->state, csk->flags, csk->tid, credits,
758 csk->wr_cred, csk->wr_una_cred);
759 break;
760 }
761
762 if (unlikely(credits < p->csum)) {
763 pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
764 csk, csk->state, csk->flags, csk->tid,
765 credits, csk->wr_cred, csk->wr_una_cred,
766 p->csum);
767 p->csum -= credits;
768 break;
769 } else {
770 cxgbi_sock_dequeue_wr(csk);
771 credits -= p->csum;
772 kfree_skb(p);
773 }
774 }
775
776 cxgbi_sock_check_wr_invariants(csk);
777
778 if (seq_chk) {
779 if (unlikely(before(snd_una, csk->snd_una))) {
780 pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
781 csk, csk->state, csk->flags, csk->tid, snd_una,
782 csk->snd_una);
783 goto done;
784 }
785
786 if (csk->snd_una != snd_una) {
787 csk->snd_una = snd_una;
788 dst_confirm(csk->dst);
789 }
790 }
791
792 if (skb_queue_len(&csk->write_queue)) {
793 if (csk->cdev->csk_push_tx_frames(csk, 0))
794 cxgbi_conn_tx_open(csk);
795 } else
796 cxgbi_conn_tx_open(csk);
797done:
798 spin_unlock_bh(&csk->lock);
799}
800EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
801
802static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
803 unsigned short mtu)
804{
805 int i = 0;
806
807 while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
808 ++i;
809
810 return i;
811}
812
813unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
814{
815 unsigned int idx;
816 struct dst_entry *dst = csk->dst;
817
818 csk->advmss = dst_metric_advmss(dst);
819
820 if (csk->advmss > pmtu - 40)
821 csk->advmss = pmtu - 40;
822 if (csk->advmss < csk->cdev->mtus[0] - 40)
823 csk->advmss = csk->cdev->mtus[0] - 40;
824 idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
825
826 return idx;
827}
828EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
829
830void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
831{
832 cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
833 __skb_queue_tail(&csk->write_queue, skb);
834}
835EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
836
837void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
838{
839 struct sk_buff *skb;
840
841 while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
842 kfree_skb(skb);
843}
844EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
845
846void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
847{
848 int pending = cxgbi_sock_count_pending_wrs(csk);
849
850 if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
851 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
852 csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
853}
854EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
855
856static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
857{
858 struct cxgbi_device *cdev = csk->cdev;
859 struct sk_buff *next;
860 int err, copied = 0;
861
862 spin_lock_bh(&csk->lock);
863
864 if (csk->state != CTP_ESTABLISHED) {
865 log_debug(1 << CXGBI_DBG_PDU_TX,
866 "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
867 csk, csk->state, csk->flags, csk->tid);
868 err = -EAGAIN;
869 goto out_err;
870 }
871
872 if (csk->err) {
873 log_debug(1 << CXGBI_DBG_PDU_TX,
874 "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
875 csk, csk->state, csk->flags, csk->tid, csk->err);
876 err = -EPIPE;
877 goto out_err;
878 }
879
880 if (csk->write_seq - csk->snd_una >= cdev->snd_win) {
881 log_debug(1 << CXGBI_DBG_PDU_TX,
882 "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
883 csk, csk->state, csk->flags, csk->tid, csk->write_seq,
884 csk->snd_una, cdev->snd_win);
885 err = -ENOBUFS;
886 goto out_err;
887 }
888
889 while (skb) {
890 int frags = skb_shinfo(skb)->nr_frags +
891 (skb->len != skb->data_len);
892
893 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
894 pr_err("csk 0x%p, skb head %u < %u.\n",
895 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
896 err = -EINVAL;
897 goto out_err;
898 }
899
900 if (frags >= SKB_WR_LIST_SIZE) {
901 pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
902 csk, skb_shinfo(skb)->nr_frags, skb->len,
903 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
904 err = -EINVAL;
905 goto out_err;
906 }
907
908 next = skb->next;
909 skb->next = NULL;
910 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
911 cxgbi_sock_skb_entail(csk, skb);
912 copied += skb->len;
913 csk->write_seq += skb->len +
914 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
915 skb = next;
916 }
917done:
918 if (likely(skb_queue_len(&csk->write_queue)))
919 cdev->csk_push_tx_frames(csk, 1);
920 spin_unlock_bh(&csk->lock);
921 return copied;
922
923out_err:
924 if (copied == 0 && err == -EPIPE)
925 copied = csk->err ? csk->err : -EPIPE;
926 else
927 copied = err;
928 goto done;
929}
930
931/*
932 * Direct Data Placement -
933 * Directly place the iSCSI Data-In or Data-Out PDU's payload into pre-posted
934 * final destination host-memory buffers based on the Initiator Task Tag (ITT)
935 * in Data-In or Target Task Tag (TTT) in Data-Out PDUs.
936 * The host memory address is programmed into h/w in the format of pagepod
937 * entries.
938 * The location of the pagepod entry is encoded into ddp tag which is used as
939 * the base for ITT/TTT.
940 */
941
942static unsigned char ddp_page_order[DDP_PGIDX_MAX] = {0, 1, 2, 4};
943static unsigned char ddp_page_shift[DDP_PGIDX_MAX] = {12, 13, 14, 16};
944static unsigned char page_idx = DDP_PGIDX_MAX;
945
946static unsigned char sw_tag_idx_bits;
947static unsigned char sw_tag_age_bits;
948
949/*
950 * Direct-Data Placement page size adjustment
951 */
952static int ddp_adjust_page_table(void)
953{
954 int i;
955 unsigned int base_order, order;
956
957 if (PAGE_SIZE < (1UL << ddp_page_shift[0])) {
958 pr_info("PAGE_SIZE 0x%lx too small, min 0x%lx\n",
959 PAGE_SIZE, 1UL << ddp_page_shift[0]);
960 return -EINVAL;
961 }
962
963 base_order = get_order(1UL << ddp_page_shift[0]);
964 order = get_order(1UL << PAGE_SHIFT);
965
966 for (i = 0; i < DDP_PGIDX_MAX; i++) {
967 /* first is the kernel page size, then just doubling */
968 ddp_page_order[i] = order - base_order + i;
969 ddp_page_shift[i] = PAGE_SHIFT + i;
970 }
971 return 0;
972}
973
974static int ddp_find_page_index(unsigned long pgsz)
975{
976 int i;
977
978 for (i = 0; i < DDP_PGIDX_MAX; i++) {
979 if (pgsz == (1UL << ddp_page_shift[i]))
980 return i;
981 }
982 pr_info("ddp page size %lu not supported.\n", pgsz);
983 return DDP_PGIDX_MAX;
984}
985
986static void ddp_setup_host_page_size(void)
987{
988 if (page_idx == DDP_PGIDX_MAX) {
989 page_idx = ddp_find_page_index(PAGE_SIZE);
990
991 if (page_idx == DDP_PGIDX_MAX) {
992 pr_info("system PAGE %lu, update hw.\n", PAGE_SIZE);
993 if (ddp_adjust_page_table() < 0) {
994 pr_info("PAGE %lu, disable ddp.\n", PAGE_SIZE);
995 return;
996 }
997 page_idx = ddp_find_page_index(PAGE_SIZE);
998 }
999 pr_info("system PAGE %lu, ddp idx %u.\n", PAGE_SIZE, page_idx);
1000 }
1001}
1002
1003void cxgbi_ddp_page_size_factor(int *pgsz_factor)
1004{
1005 int i;
1006
1007 for (i = 0; i < DDP_PGIDX_MAX; i++)
1008 pgsz_factor[i] = ddp_page_order[i];
1009}
1010EXPORT_SYMBOL_GPL(cxgbi_ddp_page_size_factor);
1011
1012/*
1013 * DDP setup & teardown
1014 */
1015
1016void cxgbi_ddp_ppod_set(struct cxgbi_pagepod *ppod,
1017 struct cxgbi_pagepod_hdr *hdr,
1018 struct cxgbi_gather_list *gl, unsigned int gidx)
1019{
1020 int i;
1021
1022 memcpy(ppod, hdr, sizeof(*hdr));
1023 for (i = 0; i < (PPOD_PAGES_MAX + 1); i++, gidx++) {
1024 ppod->addr[i] = gidx < gl->nelem ?
1025 cpu_to_be64(gl->phys_addr[gidx]) : 0ULL;
1026 }
1027}
1028EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_set);
1029
1030void cxgbi_ddp_ppod_clear(struct cxgbi_pagepod *ppod)
1031{
1032 memset(ppod, 0, sizeof(*ppod));
1033}
1034EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_clear);
1035
1036static inline int ddp_find_unused_entries(struct cxgbi_ddp_info *ddp,
1037 unsigned int start, unsigned int max,
1038 unsigned int count,
1039 struct cxgbi_gather_list *gl)
1040{
1041 unsigned int i, j, k;
1042
1043 /* not enough entries */
1044 if ((max - start) < count) {
1045 log_debug(1 << CXGBI_DBG_DDP,
1046 "NOT enough entries %u+%u < %u.\n", start, count, max);
1047 return -EBUSY;
1048 }
1049
1050 max -= count;
1051 spin_lock(&ddp->map_lock);
1052 for (i = start; i < max;) {
1053 for (j = 0, k = i; j < count; j++, k++) {
1054 if (ddp->gl_map[k])
1055 break;
1056 }
1057 if (j == count) {
1058 for (j = 0, k = i; j < count; j++, k++)
1059 ddp->gl_map[k] = gl;
1060 spin_unlock(&ddp->map_lock);
1061 return i;
1062 }
1063 i += j + 1;
1064 }
1065 spin_unlock(&ddp->map_lock);
1066 log_debug(1 << CXGBI_DBG_DDP,
1067 "NO suitable entries %u available.\n", count);
1068 return -EBUSY;
1069}
1070
1071static inline void ddp_unmark_entries(struct cxgbi_ddp_info *ddp,
1072 int start, int count)
1073{
1074 spin_lock(&ddp->map_lock);
1075 memset(&ddp->gl_map[start], 0,
1076 count * sizeof(struct cxgbi_gather_list *));
1077 spin_unlock(&ddp->map_lock);
1078}
1079
1080static inline void ddp_gl_unmap(struct pci_dev *pdev,
1081 struct cxgbi_gather_list *gl)
1082{
1083 int i;
1084
1085 for (i = 0; i < gl->nelem; i++)
1086 dma_unmap_page(&pdev->dev, gl->phys_addr[i], PAGE_SIZE,
1087 PCI_DMA_FROMDEVICE);
1088}
1089
1090static inline int ddp_gl_map(struct pci_dev *pdev,
1091 struct cxgbi_gather_list *gl)
1092{
1093 int i;
1094
1095 for (i = 0; i < gl->nelem; i++) {
1096 gl->phys_addr[i] = dma_map_page(&pdev->dev, gl->pages[i], 0,
1097 PAGE_SIZE,
1098 PCI_DMA_FROMDEVICE);
1099 if (unlikely(dma_mapping_error(&pdev->dev, gl->phys_addr[i]))) {
1100 log_debug(1 << CXGBI_DBG_DDP,
1101 "page %d 0x%p, 0x%p dma mapping err.\n",
1102 i, gl->pages[i], pdev);
1103 goto unmap;
1104 }
1105 }
1106 return i;
1107unmap:
1108 if (i) {
1109 unsigned int nelem = gl->nelem;
1110
1111 gl->nelem = i;
1112 ddp_gl_unmap(pdev, gl);
1113 gl->nelem = nelem;
1114 }
1115 return -EINVAL;
1116}
1117
1118static void ddp_release_gl(struct cxgbi_gather_list *gl,
1119 struct pci_dev *pdev)
1120{
1121 ddp_gl_unmap(pdev, gl);
1122 kfree(gl);
1123}
1124
1125static struct cxgbi_gather_list *ddp_make_gl(unsigned int xferlen,
1126 struct scatterlist *sgl,
1127 unsigned int sgcnt,
1128 struct pci_dev *pdev,
1129 gfp_t gfp)
1130{
1131 struct cxgbi_gather_list *gl;
1132 struct scatterlist *sg = sgl;
1133 struct page *sgpage = sg_page(sg);
1134 unsigned int sglen = sg->length;
1135 unsigned int sgoffset = sg->offset;
1136 unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >>
1137 PAGE_SHIFT;
1138 int i = 1, j = 0;
1139
1140 if (xferlen < DDP_THRESHOLD) {
1141 log_debug(1 << CXGBI_DBG_DDP,
1142 "xfer %u < threshold %u, no ddp.\n",
1143 xferlen, DDP_THRESHOLD);
1144 return NULL;
1145 }
1146
1147 gl = kzalloc(sizeof(struct cxgbi_gather_list) +
1148 npages * (sizeof(dma_addr_t) +
1149 sizeof(struct page *)), gfp);
1150 if (!gl) {
1151 log_debug(1 << CXGBI_DBG_DDP,
1152 "xfer %u, %u pages, OOM.\n", xferlen, npages);
1153 return NULL;
1154 }
1155
1156 log_debug(1 << CXGBI_DBG_DDP,
1157 "xfer %u, sgl %u, gl max %u.\n", xferlen, sgcnt, npages);
1158
1159 gl->pages = (struct page **)&gl->phys_addr[npages];
1160 gl->nelem = npages;
1161 gl->length = xferlen;
1162 gl->offset = sgoffset;
1163 gl->pages[0] = sgpage;
1164
1165 for (i = 1, sg = sg_next(sgl), j = 0; i < sgcnt;
1166 i++, sg = sg_next(sg)) {
1167 struct page *page = sg_page(sg);
1168
1169 if (sgpage == page && sg->offset == sgoffset + sglen)
1170 sglen += sg->length;
1171 else {
1172 /* make sure the sgl is fit for ddp:
1173 * each has the same page size, and
1174 * all of the middle pages are used completely
1175 */
1176 if ((j && sgoffset) || ((i != sgcnt - 1) &&
1177 ((sglen + sgoffset) & ~PAGE_MASK))) {
1178 log_debug(1 << CXGBI_DBG_DDP,
1179 "page %d/%u, %u + %u.\n",
1180 i, sgcnt, sgoffset, sglen);
1181 goto error_out;
1182 }
1183
1184 j++;
1185 if (j == gl->nelem || sg->offset) {
1186 log_debug(1 << CXGBI_DBG_DDP,
1187 "page %d/%u, offset %u.\n",
1188 j, gl->nelem, sg->offset);
1189 goto error_out;
1190 }
1191 gl->pages[j] = page;
1192 sglen = sg->length;
1193 sgoffset = sg->offset;
1194 sgpage = page;
1195 }
1196 }
1197 gl->nelem = ++j;
1198
1199 if (ddp_gl_map(pdev, gl) < 0)
1200 goto error_out;
1201
1202 return gl;
1203
1204error_out:
1205 kfree(gl);
1206 return NULL;
1207}
1208
1209static void ddp_tag_release(struct cxgbi_hba *chba, u32 tag)
1210{
1211 struct cxgbi_device *cdev = chba->cdev;
1212 struct cxgbi_ddp_info *ddp = cdev->ddp;
1213 u32 idx;
1214
1215 idx = (tag >> PPOD_IDX_SHIFT) & ddp->idx_mask;
1216 if (idx < ddp->nppods) {
1217 struct cxgbi_gather_list *gl = ddp->gl_map[idx];
1218 unsigned int npods;
1219
1220 if (!gl || !gl->nelem) {
1221 pr_warn("tag 0x%x, idx %u, gl 0x%p, %u.\n",
1222 tag, idx, gl, gl ? gl->nelem : 0);
1223 return;
1224 }
1225 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1226 log_debug(1 << CXGBI_DBG_DDP,
1227 "tag 0x%x, release idx %u, npods %u.\n",
1228 tag, idx, npods);
1229 cdev->csk_ddp_clear(chba, tag, idx, npods);
1230 ddp_unmark_entries(ddp, idx, npods);
1231 ddp_release_gl(gl, ddp->pdev);
1232 } else
1233 pr_warn("tag 0x%x, idx %u > max %u.\n", tag, idx, ddp->nppods);
1234}
1235
1236static int ddp_tag_reserve(struct cxgbi_sock *csk, unsigned int tid,
1237 u32 sw_tag, u32 *tagp, struct cxgbi_gather_list *gl,
1238 gfp_t gfp)
1239{
1240 struct cxgbi_device *cdev = csk->cdev;
1241 struct cxgbi_ddp_info *ddp = cdev->ddp;
1242 struct cxgbi_tag_format *tformat = &cdev->tag_format;
1243 struct cxgbi_pagepod_hdr hdr;
1244 unsigned int npods;
1245 int idx = -1;
1246 int err = -ENOMEM;
1247 u32 tag;
1248
1249 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1250 if (ddp->idx_last == ddp->nppods)
1251 idx = ddp_find_unused_entries(ddp, 0, ddp->nppods,
1252 npods, gl);
1253 else {
1254 idx = ddp_find_unused_entries(ddp, ddp->idx_last + 1,
1255 ddp->nppods, npods,
1256 gl);
1257 if (idx < 0 && ddp->idx_last >= npods) {
1258 idx = ddp_find_unused_entries(ddp, 0,
1259 min(ddp->idx_last + npods, ddp->nppods),
1260 npods, gl);
1261 }
1262 }
1263 if (idx < 0) {
1264 log_debug(1 << CXGBI_DBG_DDP,
1265 "xferlen %u, gl %u, npods %u NO DDP.\n",
1266 gl->length, gl->nelem, npods);
1267 return idx;
1268 }
1269
1270 tag = cxgbi_ddp_tag_base(tformat, sw_tag);
1271 tag |= idx << PPOD_IDX_SHIFT;
1272
1273 hdr.rsvd = 0;
1274 hdr.vld_tid = htonl(PPOD_VALID_FLAG | PPOD_TID(tid));
1275 hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask);
1276 hdr.max_offset = htonl(gl->length);
1277 hdr.page_offset = htonl(gl->offset);
1278
1279 err = cdev->csk_ddp_set(csk, &hdr, idx, npods, gl);
1280 if (err < 0)
1281 goto unmark_entries;
1282
1283 ddp->idx_last = idx;
1284 log_debug(1 << CXGBI_DBG_DDP,
1285 "xfer %u, gl %u,%u, tid 0x%x, tag 0x%x->0x%x(%u,%u).\n",
1286 gl->length, gl->nelem, gl->offset, tid, sw_tag, tag, idx,
1287 npods);
1288 *tagp = tag;
1289 return 0;
1290
1291unmark_entries:
1292 ddp_unmark_entries(ddp, idx, npods);
1293 return err;
1294}
1295
1296int cxgbi_ddp_reserve(struct cxgbi_sock *csk, unsigned int *tagp,
1297 unsigned int sw_tag, unsigned int xferlen,
1298 struct scatterlist *sgl, unsigned int sgcnt, gfp_t gfp)
1299{
1300 struct cxgbi_device *cdev = csk->cdev;
1301 struct cxgbi_tag_format *tformat = &cdev->tag_format;
1302 struct cxgbi_gather_list *gl;
1303 int err;
1304
1305 if (page_idx >= DDP_PGIDX_MAX || !cdev->ddp ||
1306 xferlen < DDP_THRESHOLD) {
1307 log_debug(1 << CXGBI_DBG_DDP,
1308 "pgidx %u, xfer %u, NO ddp.\n", page_idx, xferlen);
1309 return -EINVAL;
1310 }
1311
1312 if (!cxgbi_sw_tag_usable(tformat, sw_tag)) {
1313 log_debug(1 << CXGBI_DBG_DDP,
1314 "sw_tag 0x%x NOT usable.\n", sw_tag);
1315 return -EINVAL;
1316 }
1317
1318 gl = ddp_make_gl(xferlen, sgl, sgcnt, cdev->pdev, gfp);
1319 if (!gl)
1320 return -ENOMEM;
1321
1322 err = ddp_tag_reserve(csk, csk->tid, sw_tag, tagp, gl, gfp);
1323 if (err < 0)
1324 ddp_release_gl(gl, cdev->pdev);
1325
1326 return err;
1327}
1328
1329static void ddp_destroy(struct kref *kref)
1330{
1331 struct cxgbi_ddp_info *ddp = container_of(kref,
1332 struct cxgbi_ddp_info,
1333 refcnt);
1334 struct cxgbi_device *cdev = ddp->cdev;
1335 int i = 0;
1336
1337 pr_info("kref 0, destroy ddp 0x%p, cdev 0x%p.\n", ddp, cdev);
1338
1339 while (i < ddp->nppods) {
1340 struct cxgbi_gather_list *gl = ddp->gl_map[i];
1341
1342 if (gl) {
1343 int npods = (gl->nelem + PPOD_PAGES_MAX - 1)
1344 >> PPOD_PAGES_SHIFT;
1345 pr_info("cdev 0x%p, ddp %d + %d.\n", cdev, i, npods);
1346 kfree(gl);
1347 i += npods;
1348 } else
1349 i++;
1350 }
1351 cxgbi_free_big_mem(ddp);
1352}
1353
1354int cxgbi_ddp_cleanup(struct cxgbi_device *cdev)
1355{
1356 struct cxgbi_ddp_info *ddp = cdev->ddp;
1357
1358 log_debug(1 << CXGBI_DBG_DDP,
1359 "cdev 0x%p, release ddp 0x%p.\n", cdev, ddp);
1360 cdev->ddp = NULL;
1361 if (ddp)
1362 return kref_put(&ddp->refcnt, ddp_destroy);
1363 return 0;
1364}
1365EXPORT_SYMBOL_GPL(cxgbi_ddp_cleanup);
1366
1367int cxgbi_ddp_init(struct cxgbi_device *cdev,
1368 unsigned int llimit, unsigned int ulimit,
1369 unsigned int max_txsz, unsigned int max_rxsz)
1370{
1371 struct cxgbi_ddp_info *ddp;
1372 unsigned int ppmax, bits;
1373
1374 ppmax = (ulimit - llimit + 1) >> PPOD_SIZE_SHIFT;
1375 bits = __ilog2_u32(ppmax) + 1;
1376 if (bits > PPOD_IDX_MAX_SIZE)
1377 bits = PPOD_IDX_MAX_SIZE;
1378 ppmax = (1 << (bits - 1)) - 1;
1379
1380 ddp = cxgbi_alloc_big_mem(sizeof(struct cxgbi_ddp_info) +
1381 ppmax * (sizeof(struct cxgbi_gather_list *) +
1382 sizeof(struct sk_buff *)),
1383 GFP_KERNEL);
1384 if (!ddp) {
1385 pr_warn("cdev 0x%p, ddp ppmax %u OOM.\n", cdev, ppmax);
1386 return -ENOMEM;
1387 }
1388 ddp->gl_map = (struct cxgbi_gather_list **)(ddp + 1);
1389 cdev->ddp = ddp;
1390
1391 spin_lock_init(&ddp->map_lock);
1392 kref_init(&ddp->refcnt);
1393
1394 ddp->cdev = cdev;
1395 ddp->pdev = cdev->pdev;
1396 ddp->llimit = llimit;
1397 ddp->ulimit = ulimit;
1398 ddp->max_txsz = min_t(unsigned int, max_txsz, ULP2_MAX_PKT_SIZE);
1399 ddp->max_rxsz = min_t(unsigned int, max_rxsz, ULP2_MAX_PKT_SIZE);
1400 ddp->nppods = ppmax;
1401 ddp->idx_last = ppmax;
1402 ddp->idx_bits = bits;
1403 ddp->idx_mask = (1 << bits) - 1;
1404 ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1;
1405
1406 cdev->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
1407 cdev->tag_format.rsvd_bits = ddp->idx_bits;
1408 cdev->tag_format.rsvd_shift = PPOD_IDX_SHIFT;
1409 cdev->tag_format.rsvd_mask = (1 << cdev->tag_format.rsvd_bits) - 1;
1410
1411 pr_info("%s tag format, sw %u, rsvd %u,%u, mask 0x%x.\n",
1412 cdev->ports[0]->name, cdev->tag_format.sw_bits,
1413 cdev->tag_format.rsvd_bits, cdev->tag_format.rsvd_shift,
1414 cdev->tag_format.rsvd_mask);
1415
1416 cdev->tx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1417 ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
1418 cdev->rx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1419 ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);
1420
1421 log_debug(1 << CXGBI_DBG_DDP,
1422 "%s max payload size: %u/%u, %u/%u.\n",
1423 cdev->ports[0]->name, cdev->tx_max_size, ddp->max_txsz,
1424 cdev->rx_max_size, ddp->max_rxsz);
1425 return 0;
1426}
1427EXPORT_SYMBOL_GPL(cxgbi_ddp_init);
1428
1429/*
1430 * APIs interacting with open-iscsi libraries
1431 */
1432
1433static unsigned char padding[4];
1434
1435static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1436{
1437 struct scsi_cmnd *sc = task->sc;
1438 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1439 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1440 struct cxgbi_hba *chba = cconn->chba;
1441 struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1442 u32 tag = ntohl((__force u32)hdr_itt);
1443
1444 log_debug(1 << CXGBI_DBG_DDP,
1445 "cdev 0x%p, release tag 0x%x.\n", chba->cdev, tag);
1446 if (sc &&
1447 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
1448 cxgbi_is_ddp_tag(tformat, tag))
1449 ddp_tag_release(chba, tag);
1450}
1451
1452static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1453{
1454 struct scsi_cmnd *sc = task->sc;
1455 struct iscsi_conn *conn = task->conn;
1456 struct iscsi_session *sess = conn->session;
1457 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1458 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1459 struct cxgbi_hba *chba = cconn->chba;
1460 struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1461 u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
1462 u32 tag = 0;
1463 int err = -EINVAL;
1464
1465 if (sc &&
1466 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)) {
1467 err = cxgbi_ddp_reserve(cconn->cep->csk, &tag, sw_tag,
1468 scsi_in(sc)->length,
1469 scsi_in(sc)->table.sgl,
1470 scsi_in(sc)->table.nents,
1471 GFP_ATOMIC);
1472 if (err < 0)
1473 log_debug(1 << CXGBI_DBG_DDP,
1474 "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1475 cconn->cep->csk, task, scsi_in(sc)->length,
1476 scsi_in(sc)->table.nents);
1477 }
1478
1479 if (err < 0)
1480 tag = cxgbi_set_non_ddp_tag(tformat, sw_tag);
1481 /* the itt need to sent in big-endian order */
1482 *hdr_itt = (__force itt_t)htonl(tag);
1483
1484 log_debug(1 << CXGBI_DBG_DDP,
1485 "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1486 chba->cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1487 return 0;
1488}
1489
1490void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1491{
1492 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1493 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1494 struct cxgbi_device *cdev = cconn->chba->cdev;
1495 u32 tag = ntohl((__force u32) itt);
1496 u32 sw_bits;
1497
1498 sw_bits = cxgbi_tag_nonrsvd_bits(&cdev->tag_format, tag);
1499 if (idx)
1500 *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
1501 if (age)
1502 *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
1503
1504 log_debug(1 << CXGBI_DBG_DDP,
1505 "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1506 cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1507 age ? *age : 0xFF);
1508}
1509EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1510
1511void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1512{
1513 struct iscsi_conn *conn = csk->user_data;
1514
1515 if (conn) {
1516 log_debug(1 << CXGBI_DBG_SOCK,
1517 "csk 0x%p, cid %d.\n", csk, conn->id);
1518 iscsi_conn_queue_work(conn);
1519 }
1520}
1521EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1522
1523/*
1524 * pdu receive, interact with libiscsi_tcp
1525 */
1526static inline int read_pdu_skb(struct iscsi_conn *conn,
1527 struct sk_buff *skb,
1528 unsigned int offset,
1529 int offloaded)
1530{
1531 int status = 0;
1532 int bytes_read;
1533
1534 bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1535 switch (status) {
1536 case ISCSI_TCP_CONN_ERR:
1537 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1538 skb, offset, offloaded);
1539 return -EIO;
1540 case ISCSI_TCP_SUSPENDED:
1541 log_debug(1 << CXGBI_DBG_PDU_RX,
1542 "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1543 skb, offset, offloaded, bytes_read);
1544 /* no transfer - just have caller flush queue */
1545 return bytes_read;
1546 case ISCSI_TCP_SKB_DONE:
1547 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1548 skb, offset, offloaded);
1549 /*
1550 * pdus should always fit in the skb and we should get
1551 * segment done notifcation.
1552 */
1553 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1554 return -EFAULT;
1555 case ISCSI_TCP_SEGMENT_DONE:
1556 log_debug(1 << CXGBI_DBG_PDU_RX,
1557 "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1558 skb, offset, offloaded, bytes_read);
1559 return bytes_read;
1560 default:
1561 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1562 skb, offset, offloaded, status);
1563 return -EINVAL;
1564 }
1565}
1566
1567static int skb_read_pdu_bhs(struct iscsi_conn *conn, struct sk_buff *skb)
1568{
1569 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1570
1571 log_debug(1 << CXGBI_DBG_PDU_RX,
1572 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1573 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1574
1575 if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1576 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1577 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1578 return -EIO;
1579 }
1580
1581 if (conn->hdrdgst_en &&
1582 cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1583 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1584 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1585 return -EIO;
1586 }
1587
1588 return read_pdu_skb(conn, skb, 0, 0);
1589}
1590
1591static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1592 struct sk_buff *skb, unsigned int offset)
1593{
1594 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1595 bool offloaded = 0;
1596 int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1597
1598 log_debug(1 << CXGBI_DBG_PDU_RX,
1599 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1600 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1601
1602 if (conn->datadgst_en &&
1603 cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1604 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1605 conn, lskb, cxgbi_skcb_flags(lskb));
1606 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1607 return -EIO;
1608 }
1609
1610 if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1611 return 0;
1612
1613 /* coalesced, add header digest length */
1614 if (lskb == skb && conn->hdrdgst_en)
1615 offset += ISCSI_DIGEST_SIZE;
1616
1617 if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1618 offloaded = 1;
1619
1620 if (opcode == ISCSI_OP_SCSI_DATA_IN)
1621 log_debug(1 << CXGBI_DBG_PDU_RX,
1622 "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1623 skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1624 tcp_conn->in.datalen, offloaded ? "is" : "not");
1625
1626 return read_pdu_skb(conn, skb, offset, offloaded);
1627}
1628
1629static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1630{
1631 struct cxgbi_device *cdev = csk->cdev;
1632 int must_send;
1633 u32 credits;
1634
1635 log_debug(1 << CXGBI_DBG_PDU_RX,
1636 "csk 0x%p,%u,0x%lu,%u, seq %u, wup %u, thre %u, %u.\n",
1637 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1638 csk->rcv_wup, cdev->rx_credit_thres,
1639 cdev->rcv_win);
1640
1641 if (csk->state != CTP_ESTABLISHED)
1642 return;
1643
1644 credits = csk->copied_seq - csk->rcv_wup;
1645 if (unlikely(!credits))
1646 return;
1647 if (unlikely(cdev->rx_credit_thres == 0))
1648 return;
1649
1650 must_send = credits + 16384 >= cdev->rcv_win;
1651 if (must_send || credits >= cdev->rx_credit_thres)
1652 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1653}
1654
1655void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1656{
1657 struct cxgbi_device *cdev = csk->cdev;
1658 struct iscsi_conn *conn = csk->user_data;
1659 struct sk_buff *skb;
1660 unsigned int read = 0;
1661 int err = 0;
1662
1663 log_debug(1 << CXGBI_DBG_PDU_RX,
1664 "csk 0x%p, conn 0x%p.\n", csk, conn);
1665
1666 if (unlikely(!conn || conn->suspend_rx)) {
1667 log_debug(1 << CXGBI_DBG_PDU_RX,
1668 "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1669 csk, conn, conn ? conn->id : 0xFF,
1670 conn ? conn->suspend_rx : 0xFF);
1671 return;
1672 }
1673
1674 while (!err) {
1675 skb = skb_peek(&csk->receive_queue);
1676 if (!skb ||
1677 !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1678 if (skb)
1679 log_debug(1 << CXGBI_DBG_PDU_RX,
1680 "skb 0x%p, NOT ready 0x%lx.\n",
1681 skb, cxgbi_skcb_flags(skb));
1682 break;
1683 }
1684 __skb_unlink(skb, &csk->receive_queue);
1685
1686 read += cxgbi_skcb_rx_pdulen(skb);
1687 log_debug(1 << CXGBI_DBG_PDU_RX,
1688 "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1689 csk, skb, skb->len, cxgbi_skcb_flags(skb),
1690 cxgbi_skcb_rx_pdulen(skb));
1691
1692 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1693 err = skb_read_pdu_bhs(conn, skb);
1694 if (err < 0) {
1695 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1696 "f 0x%lx, plen %u.\n",
1697 csk, skb, skb->len,
1698 cxgbi_skcb_flags(skb),
1699 cxgbi_skcb_rx_pdulen(skb));
1700 goto skb_done;
1701 }
1702 err = skb_read_pdu_data(conn, skb, skb,
1703 err + cdev->skb_rx_extra);
1704 if (err < 0)
1705 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1706 "f 0x%lx, plen %u.\n",
1707 csk, skb, skb->len,
1708 cxgbi_skcb_flags(skb),
1709 cxgbi_skcb_rx_pdulen(skb));
1710 } else {
1711 err = skb_read_pdu_bhs(conn, skb);
1712 if (err < 0) {
1713 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1714 "f 0x%lx, plen %u.\n",
1715 csk, skb, skb->len,
1716 cxgbi_skcb_flags(skb),
1717 cxgbi_skcb_rx_pdulen(skb));
1718 goto skb_done;
1719 }
1720
1721 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1722 struct sk_buff *dskb;
1723
1724 dskb = skb_peek(&csk->receive_queue);
1725 if (!dskb) {
1726 pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1727 " plen %u, NO data.\n",
1728 csk, skb, skb->len,
1729 cxgbi_skcb_flags(skb),
1730 cxgbi_skcb_rx_pdulen(skb));
1731 err = -EIO;
1732 goto skb_done;
1733 }
1734 __skb_unlink(dskb, &csk->receive_queue);
1735
1736 err = skb_read_pdu_data(conn, skb, dskb, 0);
1737 if (err < 0)
1738 pr_err("data, csk 0x%p, skb 0x%p,%u, "
1739 "f 0x%lx, plen %u, dskb 0x%p,"
1740 "%u.\n",
1741 csk, skb, skb->len,
1742 cxgbi_skcb_flags(skb),
1743 cxgbi_skcb_rx_pdulen(skb),
1744 dskb, dskb->len);
1745 __kfree_skb(dskb);
1746 } else
1747 err = skb_read_pdu_data(conn, skb, skb, 0);
1748 }
1749skb_done:
1750 __kfree_skb(skb);
1751
1752 if (err < 0)
1753 break;
1754 }
1755
1756 log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
1757 if (read) {
1758 csk->copied_seq += read;
1759 csk_return_rx_credits(csk, read);
1760 conn->rxdata_octets += read;
1761 }
1762
1763 if (err < 0) {
1764 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
1765 csk, conn, err, read);
1766 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1767 }
1768}
1769EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
1770
1771static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
1772 unsigned int offset, unsigned int *off,
1773 struct scatterlist **sgp)
1774{
1775 int i;
1776 struct scatterlist *sg;
1777
1778 for_each_sg(sgl, sg, sgcnt, i) {
1779 if (offset < sg->length) {
1780 *off = offset;
1781 *sgp = sg;
1782 return 0;
1783 }
1784 offset -= sg->length;
1785 }
1786 return -EFAULT;
1787}
1788
1789static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
1790 unsigned int dlen, skb_frag_t *frags,
1791 int frag_max)
1792{
1793 unsigned int datalen = dlen;
1794 unsigned int sglen = sg->length - sgoffset;
1795 struct page *page = sg_page(sg);
1796 int i;
1797
1798 i = 0;
1799 do {
1800 unsigned int copy;
1801
1802 if (!sglen) {
1803 sg = sg_next(sg);
1804 if (!sg) {
1805 pr_warn("sg %d NULL, len %u/%u.\n",
1806 i, datalen, dlen);
1807 return -EINVAL;
1808 }
1809 sgoffset = 0;
1810 sglen = sg->length;
1811 page = sg_page(sg);
1812
1813 }
1814 copy = min(datalen, sglen);
1815 if (i && page == frags[i - 1].page &&
1816 sgoffset + sg->offset ==
1817 frags[i - 1].page_offset + frags[i - 1].size) {
1818 frags[i - 1].size += copy;
1819 } else {
1820 if (i >= frag_max) {
1821 pr_warn("too many pages %u, dlen %u.\n",
1822 frag_max, dlen);
1823 return -EINVAL;
1824 }
1825
1826 frags[i].page = page;
1827 frags[i].page_offset = sg->offset + sgoffset;
1828 frags[i].size = copy;
1829 i++;
1830 }
1831 datalen -= copy;
1832 sgoffset += copy;
1833 sglen -= copy;
1834 } while (datalen);
1835
1836 return i;
1837}
1838
1839int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
1840{
1841 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1842 struct cxgbi_conn *cconn = tcp_conn->dd_data;
1843 struct cxgbi_device *cdev = cconn->chba->cdev;
1844 struct iscsi_conn *conn = task->conn;
1845 struct iscsi_tcp_task *tcp_task = task->dd_data;
1846 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1847 struct scsi_cmnd *sc = task->sc;
1848 int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
1849
1850 tcp_task->dd_data = tdata;
1851 task->hdr = NULL;
1852
1853 if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
1854 (opcode == ISCSI_OP_SCSI_DATA_OUT ||
1855 (opcode == ISCSI_OP_SCSI_CMD &&
1856 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
1857 /* data could goes into skb head */
1858 headroom += min_t(unsigned int,
1859 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
1860 conn->max_xmit_dlength);
1861
1862 tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
1863 if (!tdata->skb) {
1864 pr_warn("alloc skb %u+%u, opcode 0x%x failed.\n",
1865 cdev->skb_tx_rsvd, headroom, opcode);
1866 return -ENOMEM;
1867 }
1868
1869 skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
1870 task->hdr = (struct iscsi_hdr *)tdata->skb->data;
1871 task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
1872
1873 /* data_out uses scsi_cmd's itt */
1874 if (opcode != ISCSI_OP_SCSI_DATA_OUT)
1875 task_reserve_itt(task, &task->hdr->itt);
1876
1877 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1878 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
1879 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
1880 conn->max_xmit_dlength, ntohl(task->hdr->itt));
1881
1882 return 0;
1883}
1884EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
1885
1886static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
1887{
1888 if (hcrc || dcrc) {
1889 u8 submode = 0;
1890
1891 if (hcrc)
1892 submode |= 1;
1893 if (dcrc)
1894 submode |= 2;
1895 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
1896 } else
1897 cxgbi_skcb_ulp_mode(skb) = 0;
1898}
1899
1900int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
1901 unsigned int count)
1902{
1903 struct iscsi_conn *conn = task->conn;
1904 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1905 struct sk_buff *skb = tdata->skb;
1906 unsigned int datalen = count;
1907 int i, padlen = iscsi_padding(count);
1908 struct page *pg;
1909
1910 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1911 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
1912 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
1913 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
1914
1915 skb_put(skb, task->hdr_len);
1916 tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
1917 if (!count)
1918 return 0;
1919
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