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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 | ||
30 | static 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 | ||
39 | MODULE_AUTHOR("Chelsio Communications, Inc."); | |
40 | MODULE_DESCRIPTION(DRV_MODULE_DESC); | |
41 | MODULE_VERSION(DRV_MODULE_VERSION); | |
42 | MODULE_LICENSE("GPL"); | |
43 | ||
44 | module_param(dbg_level, uint, 0644); | |
45 | MODULE_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 | */ | |
52 | static LIST_HEAD(cdev_list); | |
53 | static DEFINE_MUTEX(cdev_mutex); | |
54 | ||
55 | int 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 | } | |
73 | EXPORT_SYMBOL_GPL(cxgbi_device_portmap_create); | |
74 | ||
75 | void 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 | } | |
96 | EXPORT_SYMBOL_GPL(cxgbi_device_portmap_cleanup); | |
97 | ||
98 | static 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 | ||
115 | struct 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 | } | |
144 | EXPORT_SYMBOL_GPL(cxgbi_device_register); | |
145 | ||
146 | void 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 | } | |
156 | EXPORT_SYMBOL_GPL(cxgbi_device_unregister); | |
157 | ||
158 | void 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 | } | |
175 | EXPORT_SYMBOL_GPL(cxgbi_device_unregister_all); | |
176 | ||
177 | struct 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 | } | |
193 | EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev); | |
194 | ||
195 | static 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 | ||
227 | void 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 | } | |
245 | EXPORT_SYMBOL_GPL(cxgbi_hbas_remove); | |
246 | ||
247 | int 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 | ||
296 | err_out: | |
297 | cxgbi_hbas_remove(cdev); | |
298 | return err; | |
299 | } | |
300 | EXPORT_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 | */ | |
316 | static 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 | ||
372 | static 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 | */ | |
406 | void 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 | } | |
421 | EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs); | |
422 | ||
423 | static 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 | ||
453 | static struct rtable *find_route_ipv4(__be32 saddr, __be32 daddr, | |
454 | __be16 sport, __be16 dport, u8 tos) | |
455 | { | |
456 | struct rtable *rt; | |
457 | struct flowi fl = { | |
458 | .oif = 0, | |
459 | .nl_u = { | |
460 | .ip4_u = { | |
461 | .daddr = daddr, | |
462 | .saddr = saddr, | |
463 | .tos = tos } | |
464 | }, | |
465 | .proto = IPPROTO_TCP, | |
466 | .uli_u = { | |
467 | .ports = { | |
468 | .sport = sport, | |
469 | .dport = dport } | |
470 | } | |
471 | }; | |
472 | ||
473 | rt = ip_route_output_flow(&init_net, &fl, NULL); | |
474 | if (IS_ERR(rt)) | |
475 | return NULL; | |
476 | ||
477 | return rt; | |
478 | } | |
479 | ||
480 | static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr) | |
481 | { | |
482 | struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr; | |
483 | struct dst_entry *dst; | |
484 | struct net_device *ndev; | |
485 | struct cxgbi_device *cdev; | |
486 | struct rtable *rt = NULL; | |
487 | struct cxgbi_sock *csk = NULL; | |
488 | unsigned int mtu = 0; | |
489 | int port = 0xFFFF; | |
490 | int err = 0; | |
491 | ||
492 | if (daddr->sin_family != AF_INET) { | |
493 | pr_info("address family 0x%x NOT supported.\n", | |
494 | daddr->sin_family); | |
495 | err = -EAFNOSUPPORT; | |
496 | goto err_out; | |
497 | } | |
498 | ||
499 | rt = find_route_ipv4(0, daddr->sin_addr.s_addr, 0, daddr->sin_port, 0); | |
500 | if (!rt) { | |
501 | pr_info("no route to ipv4 0x%x, port %u.\n", | |
502 | daddr->sin_addr.s_addr, daddr->sin_port); | |
503 | err = -ENETUNREACH; | |
504 | goto err_out; | |
505 | } | |
506 | dst = &rt->dst; | |
507 | ndev = dst->neighbour->dev; | |
508 | ||
509 | if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) { | |
510 | pr_info("multi-cast route %pI4, port %u, dev %s.\n", | |
511 | &daddr->sin_addr.s_addr, ntohs(daddr->sin_port), | |
512 | ndev->name); | |
513 | err = -ENETUNREACH; | |
514 | goto rel_rt; | |
515 | } | |
516 | ||
517 | if (ndev->flags & IFF_LOOPBACK) { | |
518 | ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr); | |
519 | mtu = ndev->mtu; | |
520 | pr_info("rt dev %s, loopback -> %s, mtu %u.\n", | |
521 | dst->neighbour->dev->name, ndev->name, mtu); | |
522 | } | |
523 | ||
524 | cdev = cxgbi_device_find_by_netdev(ndev, &port); | |
525 | if (!cdev) { | |
526 | pr_info("dst %pI4, %s, NOT cxgbi device.\n", | |
527 | &daddr->sin_addr.s_addr, ndev->name); | |
528 | err = -ENETUNREACH; | |
529 | goto rel_rt; | |
530 | } | |
531 | log_debug(1 << CXGBI_DBG_SOCK, | |
532 | "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n", | |
533 | &daddr->sin_addr.s_addr, ntohs(daddr->sin_port), | |
534 | port, ndev->name, cdev); | |
535 | ||
536 | csk = cxgbi_sock_create(cdev); | |
537 | if (!csk) { | |
538 | err = -ENOMEM; | |
539 | goto rel_rt; | |
540 | } | |
541 | csk->cdev = cdev; | |
542 | csk->port_id = port; | |
543 | csk->mtu = mtu; | |
544 | csk->dst = dst; | |
545 | csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr; | |
546 | csk->daddr.sin_port = daddr->sin_port; | |
547 | csk->saddr.sin_addr.s_addr = rt->rt_src; | |
548 | ||
549 | return csk; | |
550 | ||
551 | rel_rt: | |
552 | ip_rt_put(rt); | |
553 | if (csk) | |
554 | cxgbi_sock_closed(csk); | |
555 | err_out: | |
556 | return ERR_PTR(err); | |
557 | } | |
558 | ||
559 | void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn, | |
560 | unsigned int opt) | |
561 | { | |
562 | csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn; | |
563 | dst_confirm(csk->dst); | |
564 | smp_mb(); | |
565 | cxgbi_sock_set_state(csk, CTP_ESTABLISHED); | |
566 | } | |
567 | EXPORT_SYMBOL_GPL(cxgbi_sock_established); | |
568 | ||
569 | static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk) | |
570 | { | |
571 | log_debug(1 << CXGBI_DBG_SOCK, | |
572 | "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n", | |
573 | csk, csk->state, csk->flags, csk->user_data); | |
574 | ||
575 | if (csk->state != CTP_ESTABLISHED) { | |
576 | read_lock_bh(&csk->callback_lock); | |
577 | if (csk->user_data) | |
578 | iscsi_conn_failure(csk->user_data, | |
579 | ISCSI_ERR_CONN_FAILED); | |
580 | read_unlock_bh(&csk->callback_lock); | |
581 | } | |
582 | } | |
583 | ||
584 | void cxgbi_sock_closed(struct cxgbi_sock *csk) | |
585 | { | |
586 | log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n", | |
587 | csk, (csk)->state, (csk)->flags, (csk)->tid); | |
588 | cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED); | |
589 | if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED) | |
590 | return; | |
591 | if (csk->saddr.sin_port) | |
592 | sock_put_port(csk); | |
593 | if (csk->dst) | |
594 | dst_release(csk->dst); | |
595 | csk->cdev->csk_release_offload_resources(csk); | |
596 | cxgbi_sock_set_state(csk, CTP_CLOSED); | |
597 | cxgbi_inform_iscsi_conn_closing(csk); | |
598 | cxgbi_sock_put(csk); | |
599 | } | |
600 | EXPORT_SYMBOL_GPL(cxgbi_sock_closed); | |
601 | ||
602 | static void need_active_close(struct cxgbi_sock *csk) | |
603 | { | |
604 | int data_lost; | |
605 | int close_req = 0; | |
606 | ||
607 | log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n", | |
608 | csk, (csk)->state, (csk)->flags, (csk)->tid); | |
609 | spin_lock_bh(&csk->lock); | |
610 | dst_confirm(csk->dst); | |
611 | data_lost = skb_queue_len(&csk->receive_queue); | |
612 | __skb_queue_purge(&csk->receive_queue); | |
613 | ||
614 | if (csk->state == CTP_ACTIVE_OPEN) | |
615 | cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED); | |
616 | else if (csk->state == CTP_ESTABLISHED) { | |
617 | close_req = 1; | |
618 | cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE); | |
619 | } else if (csk->state == CTP_PASSIVE_CLOSE) { | |
620 | close_req = 1; | |
621 | cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2); | |
622 | } | |
623 | ||
624 | if (close_req) { | |
625 | if (data_lost) | |
626 | csk->cdev->csk_send_abort_req(csk); | |
627 | else | |
628 | csk->cdev->csk_send_close_req(csk); | |
629 | } | |
630 | ||
631 | spin_unlock_bh(&csk->lock); | |
632 | } | |
633 | ||
634 | void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno) | |
635 | { | |
636 | pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n", | |
637 | csk, csk->state, csk->flags, | |
638 | &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port, | |
639 | &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port, | |
640 | errno); | |
641 | ||
642 | cxgbi_sock_set_state(csk, CTP_CONNECTING); | |
643 | csk->err = errno; | |
644 | cxgbi_sock_closed(csk); | |
645 | } | |
646 | EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open); | |
647 | ||
648 | void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb) | |
649 | { | |
650 | struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk; | |
651 | ||
652 | log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n", | |
653 | csk, (csk)->state, (csk)->flags, (csk)->tid); | |
654 | cxgbi_sock_get(csk); | |
655 | spin_lock_bh(&csk->lock); | |
656 | if (csk->state == CTP_ACTIVE_OPEN) | |
657 | cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH); | |
658 | spin_unlock_bh(&csk->lock); | |
659 | cxgbi_sock_put(csk); | |
660 | __kfree_skb(skb); | |
661 | } | |
662 | EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure); | |
663 | ||
664 | void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk) | |
665 | { | |
666 | cxgbi_sock_get(csk); | |
667 | spin_lock_bh(&csk->lock); | |
668 | if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) { | |
669 | if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_RCVD)) | |
670 | cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD); | |
671 | else { | |
672 | cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_RCVD); | |
673 | cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING); | |
674 | if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD)) | |
675 | pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n", | |
676 | csk, csk->state, csk->flags, csk->tid); | |
677 | cxgbi_sock_closed(csk); | |
678 | } | |
679 | } | |
680 | spin_unlock_bh(&csk->lock); | |
681 | cxgbi_sock_put(csk); | |
682 | } | |
683 | EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl); | |
684 | ||
685 | void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk) | |
686 | { | |
687 | log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n", | |
688 | csk, (csk)->state, (csk)->flags, (csk)->tid); | |
689 | cxgbi_sock_get(csk); | |
690 | spin_lock_bh(&csk->lock); | |
691 | ||
692 | if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) | |
693 | goto done; | |
694 | ||
695 | switch (csk->state) { | |
696 | case CTP_ESTABLISHED: | |
697 | cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE); | |
698 | break; | |
699 | case CTP_ACTIVE_CLOSE: | |
700 | cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2); | |
701 | break; | |
702 | case CTP_CLOSE_WAIT_1: | |
703 | cxgbi_sock_closed(csk); | |
704 | break; | |
705 | case CTP_ABORTING: | |
706 | break; | |
707 | default: | |
708 | pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n", | |
709 | csk, csk->state, csk->flags, csk->tid); | |
710 | } | |
711 | cxgbi_inform_iscsi_conn_closing(csk); | |
712 | done: | |
713 | spin_unlock_bh(&csk->lock); | |
714 | cxgbi_sock_put(csk); | |
715 | } | |
716 | EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close); | |
717 | ||
718 | void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt) | |
719 | { | |
720 | log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n", | |
721 | csk, (csk)->state, (csk)->flags, (csk)->tid); | |
722 | cxgbi_sock_get(csk); | |
723 | spin_lock_bh(&csk->lock); | |
724 | ||
725 | csk->snd_una = snd_nxt - 1; | |
726 | if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) | |
727 | goto done; | |
728 | ||
729 | switch (csk->state) { | |
730 | case CTP_ACTIVE_CLOSE: | |
731 | cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1); | |
732 | break; | |
733 | case CTP_CLOSE_WAIT_1: | |
734 | case CTP_CLOSE_WAIT_2: | |
735 | cxgbi_sock_closed(csk); | |
736 | break; | |
737 | case CTP_ABORTING: | |
738 | break; | |
739 | default: | |
740 | pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n", | |
741 | csk, csk->state, csk->flags, csk->tid); | |
742 | } | |
743 | done: | |
744 | spin_unlock_bh(&csk->lock); | |
745 | cxgbi_sock_put(csk); | |
746 | } | |
747 | EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl); | |
748 | ||
749 | void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits, | |
750 | unsigned int snd_una, int seq_chk) | |
751 | { | |
752 | log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK, | |
753 | "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n", | |
754 | csk, csk->state, csk->flags, csk->tid, credits, | |
755 | csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk); | |
756 | ||
757 | spin_lock_bh(&csk->lock); | |
758 | ||
759 | csk->wr_cred += credits; | |
760 | if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred) | |
761 | csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred; | |
762 | ||
763 | while (credits) { | |
764 | struct sk_buff *p = cxgbi_sock_peek_wr(csk); | |
765 | ||
766 | if (unlikely(!p)) { | |
767 | pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n", | |
768 | csk, csk->state, csk->flags, csk->tid, credits, | |
769 | csk->wr_cred, csk->wr_una_cred); | |
770 | break; | |
771 | } | |
772 | ||
773 | if (unlikely(credits < p->csum)) { | |
774 | pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n", | |
775 | csk, csk->state, csk->flags, csk->tid, | |
776 | credits, csk->wr_cred, csk->wr_una_cred, | |
777 | p->csum); | |
778 | p->csum -= credits; | |
779 | break; | |
780 | } else { | |
781 | cxgbi_sock_dequeue_wr(csk); | |
782 | credits -= p->csum; | |
783 | kfree_skb(p); | |
784 | } | |
785 | } | |
786 | ||
787 | cxgbi_sock_check_wr_invariants(csk); | |
788 | ||
789 | if (seq_chk) { | |
790 | if (unlikely(before(snd_una, csk->snd_una))) { | |
791 | pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.", | |
792 | csk, csk->state, csk->flags, csk->tid, snd_una, | |
793 | csk->snd_una); | |
794 | goto done; | |
795 | } | |
796 | ||
797 | if (csk->snd_una != snd_una) { | |
798 | csk->snd_una = snd_una; | |
799 | dst_confirm(csk->dst); | |
800 | } | |
801 | } | |
802 | ||
803 | if (skb_queue_len(&csk->write_queue)) { | |
804 | if (csk->cdev->csk_push_tx_frames(csk, 0)) | |
805 | cxgbi_conn_tx_open(csk); | |
806 | } else | |
807 | cxgbi_conn_tx_open(csk); | |
808 | done: | |
809 | spin_unlock_bh(&csk->lock); | |
810 | } | |
811 | EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack); | |
812 | ||
813 | static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk, | |
814 | unsigned short mtu) | |
815 | { | |
816 | int i = 0; | |
817 | ||
818 | while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu) | |
819 | ++i; | |
820 | ||
821 | return i; | |
822 | } | |
823 | ||
824 | unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu) | |
825 | { | |
826 | unsigned int idx; | |
827 | struct dst_entry *dst = csk->dst; | |
828 | ||
829 | csk->advmss = dst_metric_advmss(dst); | |
830 | ||
831 | if (csk->advmss > pmtu - 40) | |
832 | csk->advmss = pmtu - 40; | |
833 | if (csk->advmss < csk->cdev->mtus[0] - 40) | |
834 | csk->advmss = csk->cdev->mtus[0] - 40; | |
835 | idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40); | |
836 | ||
837 | return idx; | |
838 | } | |
839 | EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss); | |
840 | ||
841 | void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb) | |
842 | { | |
843 | cxgbi_skcb_tcp_seq(skb) = csk->write_seq; | |
844 | __skb_queue_tail(&csk->write_queue, skb); | |
845 | } | |
846 | EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail); | |
847 | ||
848 | void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk) | |
849 | { | |
850 | struct sk_buff *skb; | |
851 | ||
852 | while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL) | |
853 | kfree_skb(skb); | |
854 | } | |
855 | EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue); | |
856 | ||
857 | void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk) | |
858 | { | |
859 | int pending = cxgbi_sock_count_pending_wrs(csk); | |
860 | ||
861 | if (unlikely(csk->wr_cred + pending != csk->wr_max_cred)) | |
862 | pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n", | |
863 | csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred); | |
864 | } | |
865 | EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants); | |
866 | ||
867 | static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb) | |
868 | { | |
869 | struct cxgbi_device *cdev = csk->cdev; | |
870 | struct sk_buff *next; | |
871 | int err, copied = 0; | |
872 | ||
873 | spin_lock_bh(&csk->lock); | |
874 | ||
875 | if (csk->state != CTP_ESTABLISHED) { | |
876 | log_debug(1 << CXGBI_DBG_PDU_TX, | |
877 | "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n", | |
878 | csk, csk->state, csk->flags, csk->tid); | |
879 | err = -EAGAIN; | |
880 | goto out_err; | |
881 | } | |
882 | ||
883 | if (csk->err) { | |
884 | log_debug(1 << CXGBI_DBG_PDU_TX, | |
885 | "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n", | |
886 | csk, csk->state, csk->flags, csk->tid, csk->err); | |
887 | err = -EPIPE; | |
888 | goto out_err; | |
889 | } | |
890 | ||
891 | if (csk->write_seq - csk->snd_una >= cdev->snd_win) { | |
892 | log_debug(1 << CXGBI_DBG_PDU_TX, | |
893 | "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n", | |
894 | csk, csk->state, csk->flags, csk->tid, csk->write_seq, | |
895 | csk->snd_una, cdev->snd_win); | |
896 | err = -ENOBUFS; | |
897 | goto out_err; | |
898 | } | |
899 | ||
900 | while (skb) { | |
901 | int frags = skb_shinfo(skb)->nr_frags + | |
902 | (skb->len != skb->data_len); | |
903 | ||
904 | if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) { | |
905 | pr_err("csk 0x%p, skb head %u < %u.\n", | |
906 | csk, skb_headroom(skb), cdev->skb_tx_rsvd); | |
907 | err = -EINVAL; | |
908 | goto out_err; | |
909 | } | |
910 | ||
911 | if (frags >= SKB_WR_LIST_SIZE) { | |
912 | pr_err("csk 0x%p, frags %d, %u,%u >%u.\n", | |
913 | csk, skb_shinfo(skb)->nr_frags, skb->len, | |
914 | skb->data_len, (uint)(SKB_WR_LIST_SIZE)); | |
915 | err = -EINVAL; | |
916 | goto out_err; | |
917 | } | |
918 | ||
919 | next = skb->next; | |
920 | skb->next = NULL; | |
921 | cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR); | |
922 | cxgbi_sock_skb_entail(csk, skb); | |
923 | copied += skb->len; | |
924 | csk->write_seq += skb->len + | |
925 | cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb)); | |
926 | skb = next; | |
927 | } | |
928 | done: | |
929 | if (likely(skb_queue_len(&csk->write_queue))) | |
930 | cdev->csk_push_tx_frames(csk, 1); | |
931 | spin_unlock_bh(&csk->lock); | |
932 | return copied; | |
933 | ||
934 | out_err: | |
935 | if (copied == 0 && err == -EPIPE) | |
936 | copied = csk->err ? csk->err : -EPIPE; | |
937 | else | |
938 | copied = err; | |
939 | goto done; | |
940 | } | |
941 | ||
942 | /* | |
943 | * Direct Data Placement - | |
944 | * Directly place the iSCSI Data-In or Data-Out PDU's payload into pre-posted | |
945 | * final destination host-memory buffers based on the Initiator Task Tag (ITT) | |
946 | * in Data-In or Target Task Tag (TTT) in Data-Out PDUs. | |
947 | * The host memory address is programmed into h/w in the format of pagepod | |
948 | * entries. | |
949 | * The location of the pagepod entry is encoded into ddp tag which is used as | |
950 | * the base for ITT/TTT. | |
951 | */ | |
952 | ||
953 | static unsigned char ddp_page_order[DDP_PGIDX_MAX] = {0, 1, 2, 4}; | |
954 | static unsigned char ddp_page_shift[DDP_PGIDX_MAX] = {12, 13, 14, 16}; | |
955 | static unsigned char page_idx = DDP_PGIDX_MAX; | |
956 | ||
957 | static unsigned char sw_tag_idx_bits; | |
958 | static unsigned char sw_tag_age_bits; | |
959 | ||
960 | /* | |
961 | * Direct-Data Placement page size adjustment | |
962 | */ | |
963 | static int ddp_adjust_page_table(void) | |
964 | { | |
965 | int i; | |
966 | unsigned int base_order, order; | |
967 | ||
968 | if (PAGE_SIZE < (1UL << ddp_page_shift[0])) { | |
969 | pr_info("PAGE_SIZE 0x%lx too small, min 0x%lx\n", | |
970 | PAGE_SIZE, 1UL << ddp_page_shift[0]); | |
971 | return -EINVAL; | |
972 | } | |
973 | ||
974 | base_order = get_order(1UL << ddp_page_shift[0]); | |
975 | order = get_order(1UL << PAGE_SHIFT); | |
976 | ||
977 | for (i = 0; i < DDP_PGIDX_MAX; i++) { | |
978 | /* first is the kernel page size, then just doubling */ | |
979 | ddp_page_order[i] = order - base_order + i; | |
980 | ddp_page_shift[i] = PAGE_SHIFT + i; | |
981 | } | |
982 | return 0; | |
983 | } | |
984 | ||
985 | static int ddp_find_page_index(unsigned long pgsz) | |
986 | { | |
987 | int i; | |
988 | ||
989 | for (i = 0; i < DDP_PGIDX_MAX; i++) { | |
990 | if (pgsz == (1UL << ddp_page_shift[i])) | |
991 | return i; | |
992 | } | |
993 | pr_info("ddp page size %lu not supported.\n", pgsz); | |
994 | return DDP_PGIDX_MAX; | |
995 | } | |
996 | ||
997 | static void ddp_setup_host_page_size(void) | |
998 | { | |
999 | if (page_idx == DDP_PGIDX_MAX) { | |
1000 | page_idx = ddp_find_page_index(PAGE_SIZE); | |
1001 | ||
1002 | if (page_idx == DDP_PGIDX_MAX) { | |
1003 | pr_info("system PAGE %lu, update hw.\n", PAGE_SIZE); | |
1004 | if (ddp_adjust_page_table() < 0) { | |
1005 | pr_info("PAGE %lu, disable ddp.\n", PAGE_SIZE); | |
1006 | return; | |
1007 | } | |
1008 | page_idx = ddp_find_page_index(PAGE_SIZE); | |
1009 | } | |
1010 | pr_info("system PAGE %lu, ddp idx %u.\n", PAGE_SIZE, page_idx); | |
1011 | } | |
1012 | } | |
1013 | ||
1014 | void cxgbi_ddp_page_size_factor(int *pgsz_factor) | |
1015 | { | |
1016 | int i; | |
1017 | ||
1018 | for (i = 0; i < DDP_PGIDX_MAX; i++) | |
1019 | pgsz_factor[i] = ddp_page_order[i]; | |
1020 | } | |
1021 | EXPORT_SYMBOL_GPL(cxgbi_ddp_page_size_factor); | |
1022 | ||
1023 | /* | |
1024 | * DDP setup & teardown | |
1025 | */ | |
1026 | ||
1027 | void cxgbi_ddp_ppod_set(struct cxgbi_pagepod *ppod, | |
1028 | struct cxgbi_pagepod_hdr *hdr, | |
1029 | struct cxgbi_gather_list *gl, unsigned int gidx) | |
1030 | { | |
1031 | int i; | |
1032 | ||
1033 | memcpy(ppod, hdr, sizeof(*hdr)); | |
1034 | for (i = 0; i < (PPOD_PAGES_MAX + 1); i++, gidx++) { | |
1035 | ppod->addr[i] = gidx < gl->nelem ? | |
1036 | cpu_to_be64(gl->phys_addr[gidx]) : 0ULL; | |
1037 | } | |
1038 | } | |
1039 | EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_set); | |
1040 | ||
1041 | void cxgbi_ddp_ppod_clear(struct cxgbi_pagepod *ppod) | |
1042 | { | |
1043 | memset(ppod, 0, sizeof(*ppod)); | |
1044 | } | |
1045 | EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_clear); | |
1046 | ||
1047 | static inline int ddp_find_unused_entries(struct cxgbi_ddp_info *ddp, | |
1048 | unsigned int start, unsigned int max, | |
1049 | unsigned int count, | |
1050 | struct cxgbi_gather_list *gl) | |
1051 | { | |
1052 | unsigned int i, j, k; | |
1053 | ||
1054 | /* not enough entries */ | |
1055 | if ((max - start) < count) { | |
1056 | log_debug(1 << CXGBI_DBG_DDP, | |
1057 | "NOT enough entries %u+%u < %u.\n", start, count, max); | |
1058 | return -EBUSY; | |
1059 | } | |
1060 | ||
1061 | max -= count; | |
1062 | spin_lock(&ddp->map_lock); | |
1063 | for (i = start; i < max;) { | |
1064 | for (j = 0, k = i; j < count; j++, k++) { | |
1065 | if (ddp->gl_map[k]) | |
1066 | break; | |
1067 | } | |
1068 | if (j == count) { | |
1069 | for (j = 0, k = i; j < count; j++, k++) | |
1070 | ddp->gl_map[k] = gl; | |
1071 | spin_unlock(&ddp->map_lock); | |
1072 | return i; | |
1073 | } | |
1074 | i += j + 1; | |
1075 | } | |
1076 | spin_unlock(&ddp->map_lock); | |
1077 | log_debug(1 << CXGBI_DBG_DDP, | |
1078 | "NO suitable entries %u available.\n", count); | |
1079 | return -EBUSY; | |
1080 | } | |
1081 | ||
1082 | static inline void ddp_unmark_entries(struct cxgbi_ddp_info *ddp, | |
1083 | int start, int count) | |
1084 | { | |
1085 | spin_lock(&ddp->map_lock); | |
1086 | memset(&ddp->gl_map[start], 0, | |
1087 | count * sizeof(struct cxgbi_gather_list *)); | |
1088 | spin_unlock(&ddp->map_lock); | |
1089 | } | |
1090 | ||
1091 | static inline void ddp_gl_unmap(struct pci_dev *pdev, | |
1092 | struct cxgbi_gather_list *gl) | |
1093 | { | |
1094 | int i; | |
1095 | ||
1096 | for (i = 0; i < gl->nelem; i++) | |
1097 | dma_unmap_page(&pdev->dev, gl->phys_addr[i], PAGE_SIZE, | |
1098 | PCI_DMA_FROMDEVICE); | |
1099 | } | |
1100 | ||
1101 | static inline int ddp_gl_map(struct pci_dev *pdev, | |
1102 | struct cxgbi_gather_list *gl) | |
1103 | { | |
1104 | int i; | |
1105 | ||
1106 | for (i = 0; i < gl->nelem; i++) { | |
1107 | gl->phys_addr[i] = dma_map_page(&pdev->dev, gl->pages[i], 0, | |
1108 | PAGE_SIZE, | |
1109 | PCI_DMA_FROMDEVICE); | |
1110 | if (unlikely(dma_mapping_error(&pdev->dev, gl->phys_addr[i]))) { | |
1111 | log_debug(1 << CXGBI_DBG_DDP, | |
1112 | "page %d 0x%p, 0x%p dma mapping err.\n", | |
1113 | i, gl->pages[i], pdev); | |
1114 | goto unmap; | |
1115 | } | |
1116 | } | |
1117 | return i; | |
1118 | unmap: | |
1119 | if (i) { | |
1120 | unsigned int nelem = gl->nelem; | |
1121 | ||
1122 | gl->nelem = i; | |
1123 | ddp_gl_unmap(pdev, gl); | |
1124 | gl->nelem = nelem; | |
1125 | } | |
1126 | return -EINVAL; | |
1127 | } | |
1128 | ||
1129 | static void ddp_release_gl(struct cxgbi_gather_list *gl, | |
1130 | struct pci_dev *pdev) | |
1131 | { | |
1132 | ddp_gl_unmap(pdev, gl); | |
1133 | kfree(gl); | |
1134 | } | |
1135 | ||
1136 | static struct cxgbi_gather_list *ddp_make_gl(unsigned int xferlen, | |
1137 | struct scatterlist *sgl, | |
1138 | unsigned int sgcnt, | |
1139 | struct pci_dev *pdev, | |
1140 | gfp_t gfp) | |
1141 | { | |
1142 | struct cxgbi_gather_list *gl; | |
1143 | struct scatterlist *sg = sgl; | |
1144 | struct page *sgpage = sg_page(sg); | |
1145 | unsigned int sglen = sg->length; | |
1146 | unsigned int sgoffset = sg->offset; | |
1147 | unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >> | |
1148 | PAGE_SHIFT; | |
1149 | int i = 1, j = 0; | |
1150 | ||
1151 | if (xferlen < DDP_THRESHOLD) { | |
1152 | log_debug(1 << CXGBI_DBG_DDP, | |
1153 | "xfer %u < threshold %u, no ddp.\n", | |
1154 | xferlen, DDP_THRESHOLD); | |
1155 | return NULL; | |
1156 | } | |
1157 | ||
1158 | gl = kzalloc(sizeof(struct cxgbi_gather_list) + | |
1159 | npages * (sizeof(dma_addr_t) + | |
1160 | sizeof(struct page *)), gfp); | |
1161 | if (!gl) { | |
1162 | log_debug(1 << CXGBI_DBG_DDP, | |
1163 | "xfer %u, %u pages, OOM.\n", xferlen, npages); | |
1164 | return NULL; | |
1165 | } | |
1166 | ||
1167 | log_debug(1 << CXGBI_DBG_DDP, | |
1168 | "xfer %u, sgl %u, gl max %u.\n", xferlen, sgcnt, npages); | |
1169 | ||
1170 | gl->pages = (struct page **)&gl->phys_addr[npages]; | |
1171 | gl->nelem = npages; | |
1172 | gl->length = xferlen; | |
1173 | gl->offset = sgoffset; | |
1174 | gl->pages[0] = sgpage; | |
1175 | ||
1176 | for (i = 1, sg = sg_next(sgl), j = 0; i < sgcnt; | |
1177 | i++, sg = sg_next(sg)) { | |
1178 | struct page *page = sg_page(sg); | |
1179 | ||
1180 | if (sgpage == page && sg->offset == sgoffset + sglen) | |
1181 | sglen += sg->length; | |
1182 | else { | |
1183 | /* make sure the sgl is fit for ddp: | |
1184 | * each has the same page size, and | |
1185 | * all of the middle pages are used completely | |
1186 | */ | |
1187 | if ((j && sgoffset) || ((i != sgcnt - 1) && | |
1188 | ((sglen + sgoffset) & ~PAGE_MASK))) { | |
1189 | log_debug(1 << CXGBI_DBG_DDP, | |
1190 | "page %d/%u, %u + %u.\n", | |
1191 | i, sgcnt, sgoffset, sglen); | |
1192 | goto error_out; | |
1193 | } | |
1194 | ||
1195 | j++; | |
1196 | if (j == gl->nelem || sg->offset) { | |
1197 | log_debug(1 << CXGBI_DBG_DDP, | |
1198 | "page %d/%u, offset %u.\n", | |
1199 | j, gl->nelem, sg->offset); | |
1200 | goto error_out; | |
1201 | } | |
1202 | gl->pages[j] = page; | |
1203 | sglen = sg->length; | |
1204 | sgoffset = sg->offset; | |
1205 | sgpage = page; | |
1206 | } | |
1207 | } | |
1208 | gl->nelem = ++j; | |
1209 | ||
1210 | if (ddp_gl_map(pdev, gl) < 0) | |
1211 | goto error_out; | |
1212 | ||
1213 | return gl; | |
1214 | ||
1215 | error_out: | |
1216 | kfree(gl); | |
1217 | return NULL; | |
1218 | } | |
1219 | ||
1220 | static void ddp_tag_release(struct cxgbi_hba *chba, u32 tag) | |
1221 | { | |
1222 | struct cxgbi_device *cdev = chba->cdev; | |
1223 | struct cxgbi_ddp_info *ddp = cdev->ddp; | |
1224 | u32 idx; | |
1225 | ||
1226 | idx = (tag >> PPOD_IDX_SHIFT) & ddp->idx_mask; | |
1227 | if (idx < ddp->nppods) { | |
1228 | struct cxgbi_gather_list *gl = ddp->gl_map[idx]; | |
1229 | unsigned int npods; | |
1230 | ||
1231 | if (!gl || !gl->nelem) { | |
1232 | pr_warn("tag 0x%x, idx %u, gl 0x%p, %u.\n", | |
1233 | tag, idx, gl, gl ? gl->nelem : 0); | |
1234 | return; | |
1235 | } | |
1236 | npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT; | |
1237 | log_debug(1 << CXGBI_DBG_DDP, | |
1238 | "tag 0x%x, release idx %u, npods %u.\n", | |
1239 | tag, idx, npods); | |
1240 | cdev->csk_ddp_clear(chba, tag, idx, npods); | |
1241 | ddp_unmark_entries(ddp, idx, npods); | |
1242 | ddp_release_gl(gl, ddp->pdev); | |
1243 | } else | |
1244 | pr_warn("tag 0x%x, idx %u > max %u.\n", tag, idx, ddp->nppods); | |
1245 | } | |
1246 | ||
1247 | static int ddp_tag_reserve(struct cxgbi_sock *csk, unsigned int tid, | |
1248 | u32 sw_tag, u32 *tagp, struct cxgbi_gather_list *gl, | |
1249 | gfp_t gfp) | |
1250 | { | |
1251 | struct cxgbi_device *cdev = csk->cdev; | |
1252 | struct cxgbi_ddp_info *ddp = cdev->ddp; | |
1253 | struct cxgbi_tag_format *tformat = &cdev->tag_format; | |
1254 | struct cxgbi_pagepod_hdr hdr; | |
1255 | unsigned int npods; | |
1256 | int idx = -1; | |
1257 | int err = -ENOMEM; | |
1258 | u32 tag; | |
1259 | ||
1260 | npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT; | |
1261 | if (ddp->idx_last == ddp->nppods) | |
1262 | idx = ddp_find_unused_entries(ddp, 0, ddp->nppods, | |
1263 | npods, gl); | |
1264 | else { | |
1265 | idx = ddp_find_unused_entries(ddp, ddp->idx_last + 1, | |
1266 | ddp->nppods, npods, | |
1267 | gl); | |
1268 | if (idx < 0 && ddp->idx_last >= npods) { | |
1269 | idx = ddp_find_unused_entries(ddp, 0, | |
1270 | min(ddp->idx_last + npods, ddp->nppods), | |
1271 | npods, gl); | |
1272 | } | |
1273 | } | |
1274 | if (idx < 0) { | |
1275 | log_debug(1 << CXGBI_DBG_DDP, | |
1276 | "xferlen %u, gl %u, npods %u NO DDP.\n", | |
1277 | gl->length, gl->nelem, npods); | |
1278 | return idx; | |
1279 | } | |
1280 | ||
1281 | if (cdev->csk_ddp_alloc_gl_skb) { | |
1282 | err = cdev->csk_ddp_alloc_gl_skb(ddp, idx, npods, gfp); | |
1283 | if (err < 0) | |
1284 | goto unmark_entries; | |
1285 | } | |
1286 | ||
1287 | tag = cxgbi_ddp_tag_base(tformat, sw_tag); | |
1288 | tag |= idx << PPOD_IDX_SHIFT; | |
1289 | ||
1290 | hdr.rsvd = 0; | |
1291 | hdr.vld_tid = htonl(PPOD_VALID_FLAG | PPOD_TID(tid)); | |
1292 | hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask); | |
1293 | hdr.max_offset = htonl(gl->length); | |
1294 | hdr.page_offset = htonl(gl->offset); | |
1295 | ||
1296 | err = cdev->csk_ddp_set(csk, &hdr, idx, npods, gl); | |
1297 | if (err < 0) { | |
1298 | if (cdev->csk_ddp_free_gl_skb) | |
1299 | cdev->csk_ddp_free_gl_skb(ddp, idx, npods); | |
1300 | goto unmark_entries; | |
1301 | } | |
1302 | ||
1303 | ddp->idx_last = idx; | |
1304 | log_debug(1 << CXGBI_DBG_DDP, | |
1305 | "xfer %u, gl %u,%u, tid 0x%x, tag 0x%x->0x%x(%u,%u).\n", | |
1306 | gl->length, gl->nelem, gl->offset, tid, sw_tag, tag, idx, | |
1307 | npods); | |
1308 | *tagp = tag; | |
1309 | return 0; | |
1310 | ||
1311 | unmark_entries: | |
1312 | ddp_unmark_entries(ddp, idx, npods); | |
1313 | return err; | |
1314 | } | |
1315 | ||
1316 | int cxgbi_ddp_reserve(struct cxgbi_sock *csk, unsigned int *tagp, | |
1317 | unsigned int sw_tag, unsigned int xferlen, | |
1318 | struct scatterlist *sgl, unsigned int sgcnt, gfp_t gfp) | |
1319 | { | |
1320 | struct cxgbi_device *cdev = csk->cdev; | |
1321 | struct cxgbi_tag_format *tformat = &cdev->tag_format; | |
1322 | struct cxgbi_gather_list *gl; | |
1323 | int err; | |
1324 | ||
1325 | if (page_idx >= DDP_PGIDX_MAX || !cdev->ddp || | |
1326 | xferlen < DDP_THRESHOLD) { | |
1327 | log_debug(1 << CXGBI_DBG_DDP, | |
1328 | "pgidx %u, xfer %u, NO ddp.\n", page_idx, xferlen); | |
1329 | return -EINVAL; | |
1330 | } | |
1331 | ||
1332 | if (!cxgbi_sw_tag_usable(tformat, sw_tag)) { | |
1333 | log_debug(1 << CXGBI_DBG_DDP, | |
1334 | "sw_tag 0x%x NOT usable.\n", sw_tag); | |
1335 | return -EINVAL; | |
1336 | } | |
1337 | ||
1338 | gl = ddp_make_gl(xferlen, sgl, sgcnt, cdev->pdev, gfp); | |
1339 | if (!gl) | |
1340 | return -ENOMEM; | |
1341 | ||
1342 | err = ddp_tag_reserve(csk, csk->tid, sw_tag, tagp, gl, gfp); | |
1343 | if (err < 0) | |
1344 | ddp_release_gl(gl, cdev->pdev); | |
1345 | ||
1346 | return err; | |
1347 | } | |
1348 | ||
1349 | static void ddp_destroy(struct kref *kref) | |
1350 | { | |
1351 | struct cxgbi_ddp_info *ddp = container_of(kref, | |
1352 | struct cxgbi_ddp_info, | |
1353 | refcnt); | |
1354 | struct cxgbi_device *cdev = ddp->cdev; | |
1355 | int i = 0; | |
1356 | ||
1357 | pr_info("kref 0, destroy ddp 0x%p, cdev 0x%p.\n", ddp, cdev); | |
1358 | ||
1359 | while (i < ddp->nppods) { | |
1360 | struct cxgbi_gather_list *gl = ddp->gl_map[i]; | |
1361 | ||
1362 | if (gl) { | |
1363 | int npods = (gl->nelem + PPOD_PAGES_MAX - 1) | |
1364 | >> PPOD_PAGES_SHIFT; | |
1365 | pr_info("cdev 0x%p, ddp %d + %d.\n", cdev, i, npods); | |
1366 | kfree(gl); | |
1367 | if (cdev->csk_ddp_free_gl_skb) | |
1368 | cdev->csk_ddp_free_gl_skb(ddp, i, npods); | |
1369 | i += npods; | |
1370 | } else | |
1371 | i++; | |
1372 | } | |
1373 | cxgbi_free_big_mem(ddp); | |
1374 | } | |
1375 | ||
1376 | int cxgbi_ddp_cleanup(struct cxgbi_device *cdev) | |
1377 | { | |
1378 | struct cxgbi_ddp_info *ddp = cdev->ddp; | |
1379 | ||
1380 | log_debug(1 << CXGBI_DBG_DDP, | |
1381 | "cdev 0x%p, release ddp 0x%p.\n", cdev, ddp); | |
1382 | cdev->ddp = NULL; | |
1383 | if (ddp) | |
1384 | return kref_put(&ddp->refcnt, ddp_destroy); | |
1385 | return 0; | |
1386 | } | |
1387 | EXPORT_SYMBOL_GPL(cxgbi_ddp_cleanup); | |
1388 | ||
1389 | int cxgbi_ddp_init(struct cxgbi_device *cdev, | |
1390 | unsigned int llimit, unsigned int ulimit, | |
1391 | unsigned int max_txsz, unsigned int max_rxsz) | |
1392 | { | |
1393 | struct cxgbi_ddp_info *ddp; | |
1394 | unsigned int ppmax, bits; | |
1395 | ||
1396 | ppmax = (ulimit - llimit + 1) >> PPOD_SIZE_SHIFT; | |
1397 | bits = __ilog2_u32(ppmax) + 1; | |
1398 | if (bits > PPOD_IDX_MAX_SIZE) | |
1399 | bits = PPOD_IDX_MAX_SIZE; | |
1400 | ppmax = (1 << (bits - 1)) - 1; | |
1401 | ||
1402 | ddp = cxgbi_alloc_big_mem(sizeof(struct cxgbi_ddp_info) + | |
1403 | ppmax * (sizeof(struct cxgbi_gather_list *) + | |
1404 | sizeof(struct sk_buff *)), | |
1405 | GFP_KERNEL); | |
1406 | if (!ddp) { | |
1407 | pr_warn("cdev 0x%p, ddp ppmax %u OOM.\n", cdev, ppmax); | |
1408 | return -ENOMEM; | |
1409 | } | |
1410 | ddp->gl_map = (struct cxgbi_gather_list **)(ddp + 1); | |
1411 | ddp->gl_skb = (struct sk_buff **)(((char *)ddp->gl_map) + | |
1412 | ppmax * sizeof(struct cxgbi_gather_list *)); | |
1413 | cdev->ddp = ddp; | |
1414 | ||
1415 | spin_lock_init(&ddp->map_lock); | |
1416 | kref_init(&ddp->refcnt); | |
1417 | ||
1418 | ddp->cdev = cdev; | |
1419 | ddp->pdev = cdev->pdev; | |
1420 | ddp->llimit = llimit; | |
1421 | ddp->ulimit = ulimit; | |
1422 | ddp->max_txsz = min_t(unsigned int, max_txsz, ULP2_MAX_PKT_SIZE); | |
1423 | ddp->max_rxsz = min_t(unsigned int, max_rxsz, ULP2_MAX_PKT_SIZE); | |
1424 | ddp->nppods = ppmax; | |
1425 | ddp->idx_last = ppmax; | |
1426 | ddp->idx_bits = bits; | |
1427 | ddp->idx_mask = (1 << bits) - 1; | |
1428 | ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1; | |
1429 | ||
1430 | cdev->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits; | |
1431 | cdev->tag_format.rsvd_bits = ddp->idx_bits; | |
1432 | cdev->tag_format.rsvd_shift = PPOD_IDX_SHIFT; | |
1433 | cdev->tag_format.rsvd_mask = (1 << cdev->tag_format.rsvd_bits) - 1; | |
1434 | ||
1435 | pr_info("%s tag format, sw %u, rsvd %u,%u, mask 0x%x.\n", | |
1436 | cdev->ports[0]->name, cdev->tag_format.sw_bits, | |
1437 | cdev->tag_format.rsvd_bits, cdev->tag_format.rsvd_shift, | |
1438 | cdev->tag_format.rsvd_mask); | |
1439 | ||
1440 | cdev->tx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD, | |
1441 | ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN); | |
1442 | cdev->rx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD, | |
1443 | ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN); | |
1444 | ||
1445 | log_debug(1 << CXGBI_DBG_DDP, | |
1446 | "%s max payload size: %u/%u, %u/%u.\n", | |
1447 | cdev->ports[0]->name, cdev->tx_max_size, ddp->max_txsz, | |
1448 | cdev->rx_max_size, ddp->max_rxsz); | |
1449 | return 0; | |
1450 | } | |
1451 | EXPORT_SYMBOL_GPL(cxgbi_ddp_init); | |
1452 | ||
1453 | /* | |
1454 | * APIs interacting with open-iscsi libraries | |
1455 | */ | |
1456 | ||
1457 | static unsigned char padding[4]; | |
1458 | ||
1459 | static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt) | |
1460 | { | |
1461 | struct scsi_cmnd *sc = task->sc; | |
1462 | struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data; | |
1463 | struct cxgbi_conn *cconn = tcp_conn->dd_data; | |
1464 | struct cxgbi_hba *chba = cconn->chba; | |
1465 | struct cxgbi_tag_format *tformat = &chba->cdev->tag_format; | |
1466 | u32 tag = ntohl((__force u32)hdr_itt); | |
1467 | ||
1468 | log_debug(1 << CXGBI_DBG_DDP, | |
1469 | "cdev 0x%p, release tag 0x%x.\n", chba->cdev, tag); | |
1470 | if (sc && | |
1471 | (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) && | |
1472 | cxgbi_is_ddp_tag(tformat, tag)) | |
1473 | ddp_tag_release(chba, tag); | |
1474 | } | |
1475 | ||
1476 | static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt) | |
1477 | { | |
1478 | struct scsi_cmnd *sc = task->sc; | |
1479 | struct iscsi_conn *conn = task->conn; | |
1480 | struct iscsi_session *sess = conn->session; | |
1481 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1482 | struct cxgbi_conn *cconn = tcp_conn->dd_data; | |
1483 | struct cxgbi_hba *chba = cconn->chba; | |
1484 | struct cxgbi_tag_format *tformat = &chba->cdev->tag_format; | |
1485 | u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt; | |
1486 | u32 tag = 0; | |
1487 | int err = -EINVAL; | |
1488 | ||
1489 | if (sc && | |
1490 | (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)) { | |
1491 | err = cxgbi_ddp_reserve(cconn->cep->csk, &tag, sw_tag, | |
1492 | scsi_in(sc)->length, | |
1493 | scsi_in(sc)->table.sgl, | |
1494 | scsi_in(sc)->table.nents, | |
1495 | GFP_ATOMIC); | |
1496 | if (err < 0) | |
1497 | log_debug(1 << CXGBI_DBG_DDP, | |
1498 | "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n", | |
1499 | cconn->cep->csk, task, scsi_in(sc)->length, | |
1500 | scsi_in(sc)->table.nents); | |
1501 | } | |
1502 | ||
1503 | if (err < 0) | |
1504 | tag = cxgbi_set_non_ddp_tag(tformat, sw_tag); | |
1505 | /* the itt need to sent in big-endian order */ | |
1506 | *hdr_itt = (__force itt_t)htonl(tag); | |
1507 | ||
1508 | log_debug(1 << CXGBI_DBG_DDP, | |
1509 | "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n", | |
1510 | chba->cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt); | |
1511 | return 0; | |
1512 | } | |
1513 | ||
1514 | void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age) | |
1515 | { | |
1516 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1517 | struct cxgbi_conn *cconn = tcp_conn->dd_data; | |
1518 | struct cxgbi_device *cdev = cconn->chba->cdev; | |
1519 | u32 tag = ntohl((__force u32) itt); | |
1520 | u32 sw_bits; | |
1521 | ||
1522 | sw_bits = cxgbi_tag_nonrsvd_bits(&cdev->tag_format, tag); | |
1523 | if (idx) | |
1524 | *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1); | |
1525 | if (age) | |
1526 | *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK; | |
1527 | ||
1528 | log_debug(1 << CXGBI_DBG_DDP, | |
1529 | "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n", | |
1530 | cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF, | |
1531 | age ? *age : 0xFF); | |
1532 | } | |
1533 | EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt); | |
1534 | ||
1535 | void cxgbi_conn_tx_open(struct cxgbi_sock *csk) | |
1536 | { | |
1537 | struct iscsi_conn *conn = csk->user_data; | |
1538 | ||
1539 | if (conn) { | |
1540 | log_debug(1 << CXGBI_DBG_SOCK, | |
1541 | "csk 0x%p, cid %d.\n", csk, conn->id); | |
1542 | iscsi_conn_queue_work(conn); | |
1543 | } | |
1544 | } | |
1545 | EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open); | |
1546 | ||
1547 | /* | |
1548 | * pdu receive, interact with libiscsi_tcp | |
1549 | */ | |
1550 | static inline int read_pdu_skb(struct iscsi_conn *conn, | |
1551 | struct sk_buff *skb, | |
1552 | unsigned int offset, | |
1553 | int offloaded) | |
1554 | { | |
1555 | int status = 0; | |
1556 | int bytes_read; | |
1557 | ||
1558 | bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status); | |
1559 | switch (status) { | |
1560 | case ISCSI_TCP_CONN_ERR: | |
1561 | pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n", | |
1562 | skb, offset, offloaded); | |
1563 | return -EIO; | |
1564 | case ISCSI_TCP_SUSPENDED: | |
1565 | log_debug(1 << CXGBI_DBG_PDU_RX, | |
1566 | "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n", | |
1567 | skb, offset, offloaded, bytes_read); | |
1568 | /* no transfer - just have caller flush queue */ | |
1569 | return bytes_read; | |
1570 | case ISCSI_TCP_SKB_DONE: | |
1571 | pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n", | |
1572 | skb, offset, offloaded); | |
1573 | /* | |
1574 | * pdus should always fit in the skb and we should get | |
1575 | * segment done notifcation. | |
1576 | */ | |
1577 | iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb."); | |
1578 | return -EFAULT; | |
1579 | case ISCSI_TCP_SEGMENT_DONE: | |
1580 | log_debug(1 << CXGBI_DBG_PDU_RX, | |
1581 | "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n", | |
1582 | skb, offset, offloaded, bytes_read); | |
1583 | return bytes_read; | |
1584 | default: | |
1585 | pr_info("skb 0x%p, off %u, %d, invalid status %d.\n", | |
1586 | skb, offset, offloaded, status); | |
1587 | return -EINVAL; | |
1588 | } | |
1589 | } | |
1590 | ||
1591 | static int skb_read_pdu_bhs(struct iscsi_conn *conn, struct sk_buff *skb) | |
1592 | { | |
1593 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1594 | ||
1595 | log_debug(1 << CXGBI_DBG_PDU_RX, | |
1596 | "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n", | |
1597 | conn, skb, skb->len, cxgbi_skcb_flags(skb)); | |
1598 | ||
1599 | if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) { | |
1600 | pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb); | |
1601 | iscsi_conn_failure(conn, ISCSI_ERR_PROTO); | |
1602 | return -EIO; | |
1603 | } | |
1604 | ||
1605 | if (conn->hdrdgst_en && | |
1606 | cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) { | |
1607 | pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb); | |
1608 | iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST); | |
1609 | return -EIO; | |
1610 | } | |
1611 | ||
1612 | return read_pdu_skb(conn, skb, 0, 0); | |
1613 | } | |
1614 | ||
1615 | static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb, | |
1616 | struct sk_buff *skb, unsigned int offset) | |
1617 | { | |
1618 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
1619 | bool offloaded = 0; | |
1620 | int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK; | |
1621 | ||
1622 | log_debug(1 << CXGBI_DBG_PDU_RX, | |
1623 | "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n", | |
1624 | conn, skb, skb->len, cxgbi_skcb_flags(skb)); | |
1625 | ||
1626 | if (conn->datadgst_en && | |
1627 | cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) { | |
1628 | pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n", | |
1629 | conn, lskb, cxgbi_skcb_flags(lskb)); | |
1630 | iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST); | |
1631 | return -EIO; | |
1632 | } | |
1633 | ||
1634 | if (iscsi_tcp_recv_segment_is_hdr(tcp_conn)) | |
1635 | return 0; | |
1636 | ||
1637 | /* coalesced, add header digest length */ | |
1638 | if (lskb == skb && conn->hdrdgst_en) | |
1639 | offset += ISCSI_DIGEST_SIZE; | |
1640 | ||
1641 | if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD)) | |
1642 | offloaded = 1; | |
1643 | ||
1644 | if (opcode == ISCSI_OP_SCSI_DATA_IN) | |
1645 | log_debug(1 << CXGBI_DBG_PDU_RX, | |
1646 | "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n", | |
1647 | skb, opcode, ntohl(tcp_conn->in.hdr->itt), | |
1648 | tcp_conn->in.datalen, offloaded ? "is" : "not"); | |
1649 | ||
1650 | return read_pdu_skb(conn, skb, offset, offloaded); | |
1651 | } | |
1652 | ||
1653 | static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied) | |
1654 | { | |
1655 | struct cxgbi_device *cdev = csk->cdev; | |
1656 | int must_send; | |
1657 | u32 credits; | |
1658 | ||
1659 | log_debug(1 << CXGBI_DBG_PDU_RX, | |
1660 | "csk 0x%p,%u,0x%lu,%u, seq %u, wup %u, thre %u, %u.\n", | |
1661 | csk, csk->state, csk->flags, csk->tid, csk->copied_seq, | |
1662 | csk->rcv_wup, cdev->rx_credit_thres, | |
1663 | cdev->rcv_win); | |
1664 | ||
1665 | if (csk->state != CTP_ESTABLISHED) | |
1666 | return; | |
1667 | ||
1668 | credits = csk->copied_seq - csk->rcv_wup; | |
1669 | if (unlikely(!credits)) | |
1670 | return; | |
1671 | if (unlikely(cdev->rx_credit_thres == 0)) | |
1672 | return; | |
1673 | ||
1674 | must_send = credits + 16384 >= cdev->rcv_win; | |
1675 | if (must_send || credits >= cdev->rx_credit_thres) | |
1676 | csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits); | |
1677 | } | |
1678 | ||
1679 | void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk) | |
1680 | { | |
1681 | struct cxgbi_device *cdev = csk->cdev; | |
1682 | struct iscsi_conn *conn = csk->user_data; | |
1683 | struct sk_buff *skb; | |
1684 | unsigned int read = 0; | |
1685 | int err = 0; | |
1686 | ||
1687 | log_debug(1 << CXGBI_DBG_PDU_RX, | |
1688 | "csk 0x%p, conn 0x%p.\n", csk, conn); | |
1689 | ||
1690 | if (unlikely(!conn || conn->suspend_rx)) { | |
1691 | log_debug(1 << CXGBI_DBG_PDU_RX, | |
1692 | "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n", | |
1693 | csk, conn, conn ? conn->id : 0xFF, | |
1694 | conn ? conn->suspend_rx : 0xFF); | |
1695 | return; | |
1696 | } | |
1697 | ||
1698 | while (!err) { | |
1699 | skb = skb_peek(&csk->receive_queue); | |
1700 | if (!skb || | |
1701 | !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) { | |
1702 | if (skb) | |
1703 | log_debug(1 << CXGBI_DBG_PDU_RX, | |
1704 | "skb 0x%p, NOT ready 0x%lx.\n", | |
1705 | skb, cxgbi_skcb_flags(skb)); | |
1706 | break; | |
1707 | } | |
1708 | __skb_unlink(skb, &csk->receive_queue); | |
1709 | ||
1710 | read += cxgbi_skcb_rx_pdulen(skb); | |
1711 | log_debug(1 << CXGBI_DBG_PDU_RX, | |
1712 | "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n", | |
1713 | csk, skb, skb->len, cxgbi_skcb_flags(skb), | |
1714 | cxgbi_skcb_rx_pdulen(skb)); | |
1715 | ||
1716 | if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) { | |
1717 | err = skb_read_pdu_bhs(conn, skb); | |
1718 | if (err < 0) { | |
1719 | pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, " | |
1720 | "f 0x%lx, plen %u.\n", | |
1721 | csk, skb, skb->len, | |
1722 | cxgbi_skcb_flags(skb), | |
1723 | cxgbi_skcb_rx_pdulen(skb)); | |
1724 | goto skb_done; | |
1725 | } | |
1726 | err = skb_read_pdu_data(conn, skb, skb, | |
1727 | err + cdev->skb_rx_extra); | |
1728 | if (err < 0) | |
1729 | pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, " | |
1730 | "f 0x%lx, plen %u.\n", | |
1731 | csk, skb, skb->len, | |
1732 | cxgbi_skcb_flags(skb), | |
1733 | cxgbi_skcb_rx_pdulen(skb)); | |
1734 | } else { | |
1735 | err = skb_read_pdu_bhs(conn, skb); | |
1736 | if (err < 0) { | |
1737 | pr_err("bhs, csk 0x%p, skb 0x%p,%u, " | |
1738 | "f 0x%lx, plen %u.\n", | |
1739 | csk, skb, skb->len, | |
1740 | cxgbi_skcb_flags(skb), | |
1741 | cxgbi_skcb_rx_pdulen(skb)); | |
1742 | goto skb_done; | |
1743 | } | |
1744 | ||
1745 | if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) { | |
1746 | struct sk_buff *dskb; | |
1747 | ||
1748 | dskb = skb_peek(&csk->receive_queue); | |
1749 | if (!dskb) { | |
1750 | pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx," | |
1751 | " plen %u, NO data.\n", | |
1752 | csk, skb, skb->len, | |
1753 | cxgbi_skcb_flags(skb), | |
1754 | cxgbi_skcb_rx_pdulen(skb)); | |
1755 | err = -EIO; | |
1756 | goto skb_done; | |
1757 | } | |
1758 | __skb_unlink(dskb, &csk->receive_queue); | |
1759 | ||
1760 | err = skb_read_pdu_data(conn, skb, dskb, 0); | |
1761 | if (err < 0) | |
1762 | pr_err("data, csk 0x%p, skb 0x%p,%u, " | |
1763 | "f 0x%lx, plen %u, dskb 0x%p," | |
1764 | "%u.\n", | |
1765 | csk, skb, skb->len, | |
1766 | cxgbi_skcb_flags(skb), | |
1767 | cxgbi_skcb_rx_pdulen(skb), | |
1768 | dskb, dskb->len); | |
1769 | __kfree_skb(dskb); | |
1770 | } else | |
1771 | err = skb_read_pdu_data(conn, skb, skb, 0); | |
1772 | } | |
1773 | skb_done: | |
1774 | __kfree_skb(skb); | |
1775 | ||
1776 | if (err < 0) | |
1777 | break; | |
1778 | } | |
1779 | ||
1780 | log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read); | |
1781 | if (read) { | |
1782 | csk->copied_seq += read; | |
1783 | csk_return_rx_credits(csk, read); | |
1784 | conn->rxdata_octets += read; | |
1785 | } | |
1786 | ||
1787 | if (err < 0) { | |
1788 | pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n", | |
1789 | csk, conn, err, read); | |
1790 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1791 | } | |
1792 | } | |
1793 | EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready); | |
1794 | ||
1795 | static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt, | |
1796 | unsigned int offset, unsigned int *off, | |
1797 | struct scatterlist **sgp) | |
1798 | { | |
1799 | int i; | |
1800 | struct scatterlist *sg; | |
1801 | ||
1802 | for_each_sg(sgl, sg, sgcnt, i) { | |
1803 | if (offset < sg->length) { | |
1804 | *off = offset; | |
1805 | *sgp = sg; | |
1806 | return 0; | |
1807 | } | |
1808 | offset -= sg->length; | |
1809 | } | |
1810 | return -EFAULT; | |
1811 | } | |
1812 | ||
1813 | static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset, | |
1814 | unsigned int dlen, skb_frag_t *frags, | |
1815 | int frag_max) | |
1816 | { | |
1817 | unsigned int datalen = dlen; | |
1818 | unsigned int sglen = sg->length - sgoffset; | |
1819 | struct page *page = sg_page(sg); | |
1820 | int i; | |
1821 | ||
1822 | i = 0; | |
1823 | do { | |
1824 | unsigned int copy; | |
1825 | ||
1826 | if (!sglen) { | |
1827 | sg = sg_next(sg); | |
1828 | if (!sg) { | |
1829 | pr_warn("sg %d NULL, len %u/%u.\n", | |
1830 | i, datalen, dlen); | |
1831 | return -EINVAL; | |
1832 | } | |
1833 | sgoffset = 0; | |
1834 | sglen = sg->length; | |
1835 | page = sg_page(sg); | |
1836 | ||
1837 | } | |
1838 | copy = min(datalen, sglen); | |
1839 | if (i && page == frags[i - 1].page && | |
1840 | sgoffset + sg->offset == | |
1841 | frags[i - 1].page_offset + frags[i - 1].size) { | |
1842 | frags[i - 1].size += copy; | |
1843 | } else { | |
1844 | if (i >= frag_max) { | |
1845 | pr_warn("too many pages %u, dlen %u.\n", | |
1846 | frag_max, dlen); | |
1847 | return -EINVAL; | |
1848 | } | |
1849 | ||
1850 | frags[i].page = page; | |
1851 | frags[i].page_offset = sg->offset + sgoffset; | |
1852 | frags[i].size = copy; | |
1853 | i++; | |
1854 | } | |
1855 | datalen -= copy; | |
1856 | sgoffset += copy; | |
1857 | sglen -= copy; | |
1858 | } while (datalen); | |
1859 | ||
1860 | return i; | |
1861 | } | |
1862 | ||
1863 | int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode) | |
1864 | { | |
1865 | struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data; | |
1866 | struct cxgbi_conn *cconn = tcp_conn->dd_data; | |
1867 | struct cxgbi_device *cdev = cconn->chba->cdev; | |
1868 | struct iscsi_conn *conn = task->conn; | |
1869 | struct iscsi_tcp_task *tcp_task = task->dd_data; | |
1870 | struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task); | |
1871 | struct scsi_cmnd *sc = task->sc; | |
1872 | int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX; | |
1873 | ||
1874 | tcp_task->dd_data = tdata; | |
1875 | task->hdr = NULL; | |
1876 | ||
1877 | if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) && | |
1878 | (opcode == ISCSI_OP_SCSI_DATA_OUT || | |
1879 | (opcode == ISCSI_OP_SCSI_CMD && | |
1880 | (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE)))) | |
1881 | /* data could goes into skb head */ | |
1882 | headroom += min_t(unsigned int, | |
1883 | SKB_MAX_HEAD(cdev->skb_tx_rsvd), | |
1884 | conn->max_xmit_dlength); | |
1885 | ||
1886 | tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC); | |
1887 | if (!tdata->skb) { | |
1888 | pr_warn("alloc skb %u+%u, opcode 0x%x failed.\n", | |
1889 | cdev->skb_tx_rsvd, headroom, opcode); | |
1890 | return -ENOMEM; | |
1891 | } | |
1892 | ||
1893 | skb_reserve(tdata->skb, cdev->skb_tx_rsvd); | |
1894 | task->hdr = (struct iscsi_hdr *)tdata->skb->data; | |
1895 | task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */ | |
1896 | ||
1897 | /* data_out uses scsi_cmd's itt */ | |
1898 | if (opcode != ISCSI_OP_SCSI_DATA_OUT) | |
1899 | task_reserve_itt(task, &task->hdr->itt); | |
1900 | ||
1901 | log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX, | |
1902 | "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n", | |
1903 | task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom, | |
1904 | conn->max_xmit_dlength, ntohl(task->hdr->itt)); | |
1905 | ||
1906 | return 0; | |
1907 | } | |
1908 | EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu); | |
1909 | ||
1910 | static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc) | |
1911 | { | |
1912 | u8 submode = 0; | |
1913 | ||
1914 | if (hcrc) | |
1915 | submode |= 1; | |
1916 | if (dcrc) | |
1917 | submode |= 2; | |
1918 | cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode; | |
1919 | } | |
1920 | ||
1921 | int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset, | |
1922 | unsigned int count) | |
1923 | { | |
1924 | struct iscsi_conn *conn = task->conn; | |
1925 | struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task); | |
1926 | struct sk_buff *skb = tdata->skb; | |
1927 | unsigned int datalen = count; | |
1928 | int i, padlen = iscsi_padding(count); | |
1929 | struct page *pg; | |
1930 | ||
1931 | log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX, | |
1932 | "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n", | |
1933 | task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK, | |
1934 | ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count); | |
1935 | ||
1936 | skb_put(skb, task->hdr_len); | |
1937 | tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0); | |
1938 | if (!count) | |
1939 | return 0; | |
1940 | ||
1941 | if (task->sc) { | |
1942 | struct scsi_data_buffer *sdb = scsi_out(task->sc); | |
1943 | struct scatterlist *sg = NULL; | |
1944 | int err; | |
1945 | ||
1946 | tdata->offset = offset; | |
1947 | tdata->count = count; | |
1948 | err = sgl_seek_offset( | |
1949 | sdb->table.sgl, sdb->table.nents, | |
1950 | tdata->offset, &tdata->sgoffset, &sg); | |
1951 | if (err < 0) { | |
1952 | pr_warn("tpdu, sgl %u, bad offset %u/%u.\n", | |
1953 | sdb->table.nents, tdata->offset, sdb->length); | |
1954 | return err; | |
1955 | } | |
1956 | err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count, | |
1957 | tdata->frags, MAX_PDU_FRAGS); | |
1958 | if (err < 0) { | |
1959 | pr_warn("tpdu, sgl %u, bad offset %u + %u.\n", | |
1960 | sdb->table.nents, tdata->offset, tdata->count); | |
1961 | return err; | |
1962 | } | |
1963 | tdata->nr_frags = err; | |
1964 | ||
1965 | if (tdata->nr_frags > MAX_SKB_FRAGS || | |
1966 | (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) { | |
1967 | char *dst = skb->data + task->hdr_len; | |
1968 | skb_frag_t *frag = tdata->frags; | |
1969 | ||
1970 | /* data fits in the skb's headroom */ | |
1971 | for (i = 0; i < tdata->nr_frags; i++, frag++) { | |
1972 | char *src = kmap_atomic(frag->page, | |
1973 | KM_SOFTIRQ0); | |
1974 | ||
1975 | memcpy(dst, src+frag->page_offset, frag->size); | |
1976 | dst += frag->size; | |
1977 | kunmap_atomic(src, KM_SOFTIRQ0); | |
1978 | } | |
1979 | if (padlen) { | |
1980 | memset(dst, 0, padlen); | |
1981 | padlen = 0; | |
1982 | } | |
1983 | skb_put(skb, count + padlen); | |
1984 | } else { | |
1985 | /* data fit into frag_list */ | |
1986 | for (i = 0; i < tdata->nr_frags; i++) | |
1987 | get_page(tdata->frags[i].page); | |
1988 | ||
1989 | memcpy(skb_shinfo(skb)->frags, tdata->frags, | |
1990 | sizeof(skb_frag_t) * tdata->nr_frags); | |
1991 | skb_shinfo(skb)->nr_frags = tdata->nr_frags; | |
1992 | skb->len += count; | |
1993 | skb->data_len += count; | |
1994 | skb->truesize += count; | |
1995 | } | |
1996 | ||
1997 | } else { | |
1998 | pg = virt_to_page(task->data); | |
1999 | ||
2000 | get_page(pg); | |
2001 | skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data), | |
2002 | count); | |
2003 | skb->len += count; | |
2004 | skb->data_len += count; | |
2005 | skb->truesize += count; | |
2006 | } | |
2007 | ||
2008 | if (padlen) { | |
2009 | i = skb_shinfo(skb)->nr_frags; | |
2010 | skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, | |
2011 | virt_to_page(padding), offset_in_page(padding), | |
2012 | padlen); | |
2013 | ||
2014 | skb->data_len += padlen; | |
2015 | skb->truesize += padlen; | |
2016 | skb->len += padlen; | |
2017 | } | |
2018 | ||
2019 | return 0; | |
2020 | } | |
2021 | EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu); | |
2022 | ||
2023 | int cxgbi_conn_xmit_pdu(struct iscsi_task *task) | |
2024 | { | |
2025 | struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data; | |
2026 | struct cxgbi_conn *cconn = tcp_conn->dd_data; | |
2027 | struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task); | |
2028 | struct sk_buff *skb = tdata->skb; | |
2029 | unsigned int datalen; | |
2030 | int err; | |
2031 | ||
2032 | if (!skb) { | |
2033 | log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX, | |
2034 | "task 0x%p, skb NULL.\n", task); | |
2035 | return 0; | |
2036 | } | |
2037 | ||
2038 | datalen = skb->data_len; | |
2039 | tdata->skb = NULL; | |
2040 | err = cxgbi_sock_send_pdus(cconn->cep->csk, skb); | |
2041 | if (err > 0) { | |
2042 | int pdulen = err; | |
2043 | ||
2044 | log_debug(1 << CXGBI_DBG_PDU_TX, | |
2045 | "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n", | |
2046 | task, task->sc, skb, skb->len, skb->data_len, err); | |
2047 | ||
2048 | if (task->conn->hdrdgst_en) | |
2049 | pdulen += ISCSI_DIGEST_SIZE; | |
2050 | ||
2051 | if (datalen && task->conn->datadgst_en) | |
2052 | pdulen += ISCSI_DIGEST_SIZE; | |
2053 | ||
2054 | task->conn->txdata_octets += pdulen; | |
2055 | return 0; | |
2056 | } | |
2057 | ||
2058 | if (err == -EAGAIN || err == -ENOBUFS) { | |
2059 | log_debug(1 << CXGBI_DBG_PDU_TX, | |
2060 | "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n", | |
2061 | task, skb, skb->len, skb->data_len, err); | |
2062 | /* reset skb to send when we are called again */ | |
2063 | tdata->skb = skb; | |
2064 | return err; | |
2065 | } | |
2066 | ||
2067 | kfree_skb(skb); | |
2068 | log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX, | |
2069 | "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n", | |
2070 | task->itt, skb, skb->len, skb->data_len, err); | |
2071 | iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err); | |
2072 | iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED); | |
2073 | return err; | |
2074 | } | |
2075 | EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu); | |
2076 | ||
2077 | void cxgbi_cleanup_task(struct iscsi_task *task) | |
2078 | { | |
2079 | struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task); | |
2080 | ||
2081 | log_debug(1 << CXGBI_DBG_ISCSI, | |
2082 | "task 0x%p, skb 0x%p, itt 0x%x.\n", | |
2083 | task, tdata->skb, task->hdr_itt); | |
2084 | ||
2085 | /* never reached the xmit task callout */ | |
2086 | if (tdata->skb) | |
2087 | __kfree_skb(tdata->skb); | |
2088 | memset(tdata, 0, sizeof(*tdata)); | |
2089 | ||
2090 | task_release_itt(task, task->hdr_itt); | |
2091 | iscsi_tcp_cleanup_task(task); | |
2092 | } | |
2093 | EXPORT_SYMBOL_GPL(cxgbi_cleanup_task); | |
2094 | ||
2095 | void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn, | |
2096 | struct iscsi_stats *stats) | |
2097 | { | |
2098 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2099 | ||
2100 | stats->txdata_octets = conn->txdata_octets; | |
2101 | stats->rxdata_octets = conn->rxdata_octets; | |
2102 | stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; | |
2103 | stats->dataout_pdus = conn->dataout_pdus_cnt; | |
2104 | stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; | |
2105 | stats->datain_pdus = conn->datain_pdus_cnt; | |
2106 | stats->r2t_pdus = conn->r2t_pdus_cnt; | |
2107 | stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; | |
2108 | stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; | |
2109 | stats->digest_err = 0; | |
2110 | stats->timeout_err = 0; | |
2111 | stats->custom_length = 1; | |
2112 | strcpy(stats->custom[0].desc, "eh_abort_cnt"); | |
2113 | stats->custom[0].value = conn->eh_abort_cnt; | |
2114 | } | |
2115 | EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats); | |
2116 | ||
2117 | static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn) | |
2118 | { | |
2119 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
2120 | struct cxgbi_conn *cconn = tcp_conn->dd_data; | |
2121 | struct cxgbi_device *cdev = cconn->chba->cdev; | |
2122 | unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd); | |
2123 | unsigned int max_def = 512 * MAX_SKB_FRAGS; | |
2124 | unsigned int max = max(max_def, headroom); | |
2125 | ||
2126 | max = min(cconn->chba->cdev->tx_max_size, max); | |
2127 | if (conn->max_xmit_dlength) | |
2128 | conn->max_xmit_dlength = min(conn->max_xmit_dlength, max); | |
2129 | else | |
2130 | conn->max_xmit_dlength = max; | |
2131 | cxgbi_align_pdu_size(conn->max_xmit_dlength); | |
2132 | ||
2133 | return 0; | |
2134 | } | |
2135 | ||
2136 | static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn) | |
2137 | { | |
2138 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
2139 | struct cxgbi_conn *cconn = tcp_conn->dd_data; | |
2140 | unsigned int max = cconn->chba->cdev->rx_max_size; | |
2141 | ||
2142 | cxgbi_align_pdu_size(max); | |
2143 | ||
2144 | if (conn->max_recv_dlength) { | |
2145 | if (conn->max_recv_dlength > max) { | |
2146 | pr_err("MaxRecvDataSegmentLength %u > %u.\n", | |
2147 | conn->max_recv_dlength, max); | |
2148 | return -EINVAL; | |
2149 | } | |
2150 | conn->max_recv_dlength = min(conn->max_recv_dlength, max); | |
2151 | cxgbi_align_pdu_size(conn->max_recv_dlength); | |
2152 | } else | |
2153 | conn->max_recv_dlength = max; | |
2154 | ||
2155 | return 0; | |
2156 | } | |
2157 | ||
2158 | int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn, | |
2159 | enum iscsi_param param, char *buf, int buflen) | |
2160 | { | |
2161 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2162 | struct iscsi_session *session = conn->session; | |
2163 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
2164 | struct cxgbi_conn *cconn = tcp_conn->dd_data; | |
2165 | struct cxgbi_sock *csk = cconn->cep->csk; | |
2166 | int value, err = 0; | |
2167 | ||
2168 | log_debug(1 << CXGBI_DBG_ISCSI, | |
2169 | "cls_conn 0x%p, param %d, buf(%d) %s.\n", | |
2170 | cls_conn, param, buflen, buf); | |
2171 | ||
2172 | switch (param) { | |
2173 | case ISCSI_PARAM_HDRDGST_EN: | |
2174 | err = iscsi_set_param(cls_conn, param, buf, buflen); | |
2175 | if (!err && conn->hdrdgst_en) | |
2176 | err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid, | |
2177 | conn->hdrdgst_en, | |
2178 | conn->datadgst_en, 0); | |
2179 | break; | |
2180 | case ISCSI_PARAM_DATADGST_EN: | |
2181 | err = iscsi_set_param(cls_conn, param, buf, buflen); | |
2182 | if (!err && conn->datadgst_en) | |
2183 | err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid, | |
2184 | conn->hdrdgst_en, | |
2185 | conn->datadgst_en, 0); | |
2186 | break; | |
2187 | case ISCSI_PARAM_MAX_R2T: | |
2188 | sscanf(buf, "%d", &value); | |
2189 | if (value <= 0 || !is_power_of_2(value)) | |
2190 | return -EINVAL; | |
2191 | if (session->max_r2t == value) | |
2192 | break; | |
2193 | iscsi_tcp_r2tpool_free(session); | |
2194 | err = iscsi_set_param(cls_conn, param, buf, buflen); | |
2195 | if (!err && iscsi_tcp_r2tpool_alloc(session)) | |
2196 | return -ENOMEM; | |
2197 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
2198 | err = iscsi_set_param(cls_conn, param, buf, buflen); | |
2199 | if (!err) | |
2200 | err = cxgbi_conn_max_recv_dlength(conn); | |
2201 | break; | |
2202 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
2203 | err = iscsi_set_param(cls_conn, param, buf, buflen); | |
2204 | if (!err) | |
2205 | err = cxgbi_conn_max_xmit_dlength(conn); | |
2206 | break; | |
2207 | default: | |
2208 | return iscsi_set_param(cls_conn, param, buf, buflen); | |
2209 | } | |
2210 | return err; | |
2211 | } | |
2212 | EXPORT_SYMBOL_GPL(cxgbi_set_conn_param); | |
2213 | ||
2214 | int cxgbi_get_conn_param(struct iscsi_cls_conn *cls_conn, | |
2215 | enum iscsi_param param, char *buf) | |
2216 | { | |
2217 | struct iscsi_conn *iconn = cls_conn->dd_data; | |
2218 | int len; | |
2219 | ||
2220 | log_debug(1 << CXGBI_DBG_ISCSI, | |
2221 | "cls_conn 0x%p, param %d.\n", cls_conn, param); | |
2222 | ||
2223 | switch (param) { | |
2224 | case ISCSI_PARAM_CONN_PORT: | |
2225 | spin_lock_bh(&iconn->session->lock); | |
2226 | len = sprintf(buf, "%hu\n", iconn->portal_port); | |
2227 | spin_unlock_bh(&iconn->session->lock); | |
2228 | break; | |
2229 | case ISCSI_PARAM_CONN_ADDRESS: | |
2230 | spin_lock_bh(&iconn->session->lock); | |
2231 | len = sprintf(buf, "%s\n", iconn->portal_address); | |
2232 | spin_unlock_bh(&iconn->session->lock); | |
2233 | break; | |
2234 | default: | |
2235 | return iscsi_conn_get_param(cls_conn, param, buf); | |
2236 | } | |
2237 | return len; | |
2238 | } | |
2239 | EXPORT_SYMBOL_GPL(cxgbi_get_conn_param); | |
2240 | ||
2241 | struct iscsi_cls_conn * | |
2242 | cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid) | |
2243 | { | |
2244 | struct iscsi_cls_conn *cls_conn; | |
2245 | struct iscsi_conn *conn; | |
2246 | struct iscsi_tcp_conn *tcp_conn; | |
2247 | struct cxgbi_conn *cconn; | |
2248 | ||
2249 | cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid); | |
2250 | if (!cls_conn) | |
2251 | return NULL; | |
2252 | ||
2253 | conn = cls_conn->dd_data; | |
2254 | tcp_conn = conn->dd_data; | |
2255 | cconn = tcp_conn->dd_data; | |
2256 | cconn->iconn = conn; | |
2257 | ||
2258 | log_debug(1 << CXGBI_DBG_ISCSI, | |
2259 | "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n", | |
2260 | cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn); | |
2261 | ||
2262 | return cls_conn; | |
2263 | } | |
2264 | EXPORT_SYMBOL_GPL(cxgbi_create_conn); | |
2265 | ||
2266 | int cxgbi_bind_conn(struct iscsi_cls_session *cls_session, | |
2267 | struct iscsi_cls_conn *cls_conn, | |
2268 | u64 transport_eph, int is_leading) | |
2269 | { | |
2270 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2271 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
2272 | struct cxgbi_conn *cconn = tcp_conn->dd_data; | |
2273 | struct iscsi_endpoint *ep; | |
2274 | struct cxgbi_endpoint *cep; | |
2275 | struct cxgbi_sock *csk; | |
2276 | int err; | |
2277 | ||
2278 | ep = iscsi_lookup_endpoint(transport_eph); | |
2279 | if (!ep) | |
2280 | return -EINVAL; | |
2281 | ||
2282 | /* setup ddp pagesize */ | |
2283 | cep = ep->dd_data; | |
2284 | csk = cep->csk; | |
2285 | err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid, page_idx, 0); | |
2286 | if (err < 0) | |
2287 | return err; | |
2288 | ||
2289 | err = iscsi_conn_bind(cls_session, cls_conn, is_leading); | |
2290 | if (err) | |
2291 | return -EINVAL; | |
2292 | ||
2293 | /* calculate the tag idx bits needed for this conn based on cmds_max */ | |
2294 | cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1; | |
2295 | ||
2296 | write_lock_bh(&csk->callback_lock); | |
2297 | csk->user_data = conn; | |
2298 | cconn->chba = cep->chba; | |
2299 | cconn->cep = cep; | |
2300 | cep->cconn = cconn; | |
2301 | write_unlock_bh(&csk->callback_lock); | |
2302 | ||
2303 | cxgbi_conn_max_xmit_dlength(conn); | |
2304 | cxgbi_conn_max_recv_dlength(conn); | |
2305 | ||
2306 | spin_lock_bh(&conn->session->lock); | |
2307 | sprintf(conn->portal_address, "%pI4", &csk->daddr.sin_addr.s_addr); | |
2308 | conn->portal_port = ntohs(csk->daddr.sin_port); | |
2309 | spin_unlock_bh(&conn->session->lock); | |
2310 | ||
2311 | log_debug(1 << CXGBI_DBG_ISCSI, | |
2312 | "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n", | |
2313 | cls_session, cls_conn, ep, cconn, csk); | |
2314 | /* init recv engine */ | |
2315 | iscsi_tcp_hdr_recv_prep(tcp_conn); | |
2316 | ||
2317 | return 0; | |
2318 | } | |
2319 | EXPORT_SYMBOL_GPL(cxgbi_bind_conn); | |
2320 | ||
2321 | struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep, | |
2322 | u16 cmds_max, u16 qdepth, | |
2323 | u32 initial_cmdsn) | |
2324 | { | |
2325 | struct cxgbi_endpoint *cep; | |
2326 | struct cxgbi_hba *chba; | |
2327 | struct Scsi_Host *shost; | |
2328 | struct iscsi_cls_session *cls_session; | |
2329 | struct iscsi_session *session; | |
2330 | ||
2331 | if (!ep) { | |
2332 | pr_err("missing endpoint.\n"); | |
2333 | return NULL; | |
2334 | } | |
2335 | ||
2336 | cep = ep->dd_data; | |
2337 | chba = cep->chba; | |
2338 | shost = chba->shost; | |
2339 | ||
2340 | BUG_ON(chba != iscsi_host_priv(shost)); | |
2341 | ||
2342 | cls_session = iscsi_session_setup(chba->cdev->itp, shost, | |
2343 | cmds_max, 0, | |
2344 | sizeof(struct iscsi_tcp_task) + | |
2345 | sizeof(struct cxgbi_task_data), | |
2346 | initial_cmdsn, ISCSI_MAX_TARGET); | |
2347 | if (!cls_session) | |
2348 | return NULL; | |
2349 | ||
2350 | session = cls_session->dd_data; | |
2351 | if (iscsi_tcp_r2tpool_alloc(session)) | |
2352 | goto remove_session; | |
2353 | ||
2354 | log_debug(1 << CXGBI_DBG_ISCSI, | |
2355 | "ep 0x%p, cls sess 0x%p.\n", ep, cls_session); | |
2356 | return cls_session; | |
2357 | ||
2358 | remove_session: | |
2359 | iscsi_session_teardown(cls_session); | |
2360 | return NULL; | |
2361 | } | |
2362 | EXPORT_SYMBOL_GPL(cxgbi_create_session); | |
2363 | ||
2364 | void cxgbi_destroy_session(struct iscsi_cls_session *cls_session) | |
2365 | { | |
2366 | log_debug(1 << CXGBI_DBG_ISCSI, | |
2367 | "cls sess 0x%p.\n", cls_session); | |
2368 | ||
2369 | iscsi_tcp_r2tpool_free(cls_session->dd_data); | |
2370 | iscsi_session_teardown(cls_session); | |
2371 | } | |
2372 | EXPORT_SYMBOL_GPL(cxgbi_destroy_session); | |
2373 | ||
2374 | int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param, | |
2375 | char *buf, int buflen) | |
2376 | { | |
2377 | struct cxgbi_hba *chba = iscsi_host_priv(shost); | |
2378 | ||
2379 | if (!chba->ndev) { | |
2380 | shost_printk(KERN_ERR, shost, "Could not get host param. " | |
2381 | "netdev for host not set.\n"); | |
2382 | return -ENODEV; | |
2383 | } | |
2384 | ||
2385 | log_debug(1 << CXGBI_DBG_ISCSI, | |
2386 | "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n", | |
2387 | shost, chba, chba->ndev->name, param, buflen, buf); | |
2388 | ||
2389 | switch (param) { | |
2390 | case ISCSI_HOST_PARAM_IPADDRESS: | |
2391 | { | |
2392 | __be32 addr = in_aton(buf); | |
2393 | log_debug(1 << CXGBI_DBG_ISCSI, | |
2394 | "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr); | |
2395 | cxgbi_set_iscsi_ipv4(chba, addr); | |
2396 | return 0; | |
2397 | } | |
2398 | case ISCSI_HOST_PARAM_HWADDRESS: | |
2399 | case ISCSI_HOST_PARAM_NETDEV_NAME: | |
2400 | return 0; | |
2401 | default: | |
2402 | return iscsi_host_set_param(shost, param, buf, buflen); | |
2403 | } | |
2404 | } | |
2405 | EXPORT_SYMBOL_GPL(cxgbi_set_host_param); | |
2406 | ||
2407 | int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param, | |
2408 | char *buf) | |
2409 | { | |
2410 | struct cxgbi_hba *chba = iscsi_host_priv(shost); | |
2411 | int len = 0; | |
2412 | ||
2413 | if (!chba->ndev) { | |
2414 | shost_printk(KERN_ERR, shost, "Could not get host param. " | |
2415 | "netdev for host not set.\n"); | |
2416 | return -ENODEV; | |
2417 | } | |
2418 | ||
2419 | log_debug(1 << CXGBI_DBG_ISCSI, | |
2420 | "shost 0x%p, hba 0x%p,%s, param %d.\n", | |
2421 | shost, chba, chba->ndev->name, param); | |
2422 | ||
2423 | switch (param) { | |
2424 | case ISCSI_HOST_PARAM_HWADDRESS: | |
2425 | len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6); | |
2426 | break; | |
2427 | case ISCSI_HOST_PARAM_NETDEV_NAME: | |
2428 | len = sprintf(buf, "%s\n", chba->ndev->name); | |
2429 | break; | |
2430 | case ISCSI_HOST_PARAM_IPADDRESS: | |
2431 | { | |
2432 | __be32 addr; | |
2433 | ||
2434 | addr = cxgbi_get_iscsi_ipv4(chba); | |
2435 | len = sprintf(buf, "%pI4", &addr); | |
2436 | log_debug(1 << CXGBI_DBG_ISCSI, | |
2437 | "hba %s, ipv4 %pI4.\n", chba->ndev->name, &addr); | |
2438 | break; | |
2439 | } | |
2440 | default: | |
2441 | return iscsi_host_get_param(shost, param, buf); | |
2442 | } | |
2443 | ||
2444 | return len; | |
2445 | } | |
2446 | EXPORT_SYMBOL_GPL(cxgbi_get_host_param); | |
2447 | ||
2448 | struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost, | |
2449 | struct sockaddr *dst_addr, | |
2450 | int non_blocking) | |
2451 | { | |
2452 | struct iscsi_endpoint *ep; | |
2453 | struct cxgbi_endpoint *cep; | |
2454 | struct cxgbi_hba *hba = NULL; | |
2455 | struct cxgbi_sock *csk; | |
2456 | int err = -EINVAL; | |
2457 | ||
2458 | log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK, | |
2459 | "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n", | |
2460 | shost, non_blocking, dst_addr); | |
2461 | ||
2462 | if (shost) { | |
2463 | hba = iscsi_host_priv(shost); | |
2464 | if (!hba) { | |
2465 | pr_info("shost 0x%p, priv NULL.\n", shost); | |
2466 | goto err_out; | |
2467 | } | |
2468 | } | |
2469 | ||
2470 | csk = cxgbi_check_route(dst_addr); | |
2471 | if (IS_ERR(csk)) | |
2472 | return (struct iscsi_endpoint *)csk; | |
2473 | cxgbi_sock_get(csk); | |
2474 | ||
2475 | if (!hba) | |
2476 | hba = csk->cdev->hbas[csk->port_id]; | |
2477 | else if (hba != csk->cdev->hbas[csk->port_id]) { | |
2478 | pr_info("Could not connect through requested host %u" | |
2479 | "hba 0x%p != 0x%p (%u).\n", | |
2480 | shost->host_no, hba, | |
2481 | csk->cdev->hbas[csk->port_id], csk->port_id); | |
2482 | err = -ENOSPC; | |
2483 | goto release_conn; | |
2484 | } | |
2485 | ||
2486 | err = sock_get_port(csk); | |
2487 | if (err) | |
2488 | goto release_conn; | |
2489 | ||
2490 | cxgbi_sock_set_state(csk, CTP_CONNECTING); | |
2491 | err = csk->cdev->csk_init_act_open(csk); | |
2492 | if (err) | |
2493 | goto release_conn; | |
2494 | ||
2495 | if (cxgbi_sock_is_closing(csk)) { | |
2496 | err = -ENOSPC; | |
2497 | pr_info("csk 0x%p is closing.\n", csk); | |
2498 | goto release_conn; | |
2499 | } | |
2500 | ||
2501 | ep = iscsi_create_endpoint(sizeof(*cep)); | |
2502 | if (!ep) { | |
2503 | err = -ENOMEM; | |
2504 | pr_info("iscsi alloc ep, OOM.\n"); | |
2505 | goto release_conn; | |
2506 | } | |
2507 | ||
2508 | cep = ep->dd_data; | |
2509 | cep->csk = csk; | |
2510 | cep->chba = hba; | |
2511 | ||
2512 | log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK, | |
2513 | "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n", | |
2514 | ep, cep, csk, hba, hba->ndev->name); | |
2515 | return ep; | |
2516 | ||
2517 | release_conn: | |
2518 | cxgbi_sock_put(csk); | |
2519 | cxgbi_sock_closed(csk); | |
2520 | err_out: | |
2521 | return ERR_PTR(err); | |
2522 | } | |
2523 | EXPORT_SYMBOL_GPL(cxgbi_ep_connect); | |
2524 | ||
2525 | int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms) | |
2526 | { | |
2527 | struct cxgbi_endpoint *cep = ep->dd_data; | |
2528 | struct cxgbi_sock *csk = cep->csk; | |
2529 | ||
2530 | if (!cxgbi_sock_is_established(csk)) | |
2531 | return 0; | |
2532 | return 1; | |
2533 | } | |
2534 | EXPORT_SYMBOL_GPL(cxgbi_ep_poll); | |
2535 | ||
2536 | void cxgbi_ep_disconnect(struct iscsi_endpoint *ep) | |
2537 | { | |
2538 | struct cxgbi_endpoint *cep = ep->dd_data; | |
2539 | struct cxgbi_conn *cconn = cep->cconn; | |
2540 | struct cxgbi_sock *csk = cep->csk; | |
2541 | ||
2542 | log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK, | |
2543 | "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n", | |
2544 | ep, cep, cconn, csk, csk->state, csk->flags); | |
2545 | ||
2546 | if (cconn && cconn->iconn) { | |
2547 | iscsi_suspend_tx(cconn->iconn); | |
2548 | write_lock_bh(&csk->callback_lock); | |
2549 | cep->csk->user_data = NULL; | |
2550 | cconn->cep = NULL; | |
2551 | write_unlock_bh(&csk->callback_lock); | |
2552 | } | |
2553 | iscsi_destroy_endpoint(ep); | |
2554 | ||
2555 | if (likely(csk->state >= CTP_ESTABLISHED)) | |
2556 | need_active_close(csk); | |
2557 | else | |
2558 | cxgbi_sock_closed(csk); | |
2559 | ||
2560 | cxgbi_sock_put(csk); | |
2561 | } | |
2562 | EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect); | |
2563 | ||
2564 | int cxgbi_iscsi_init(struct iscsi_transport *itp, | |
2565 | struct scsi_transport_template **stt) | |
2566 | { | |
2567 | *stt = iscsi_register_transport(itp); | |
2568 | if (*stt == NULL) { | |
2569 | pr_err("unable to register %s transport 0x%p.\n", | |
2570 | itp->name, itp); | |
2571 | return -ENODEV; | |
2572 | } | |
2573 | log_debug(1 << CXGBI_DBG_ISCSI, | |
2574 | "%s, registered iscsi transport 0x%p.\n", | |
2575 | itp->name, stt); | |
2576 | return 0; | |
2577 | } | |
2578 | EXPORT_SYMBOL_GPL(cxgbi_iscsi_init); | |
2579 | ||
2580 | void cxgbi_iscsi_cleanup(struct iscsi_transport *itp, | |
2581 | struct scsi_transport_template **stt) | |
2582 | { | |
2583 | if (*stt) { | |
2584 | log_debug(1 << CXGBI_DBG_ISCSI, | |
2585 | "de-register transport 0x%p, %s, stt 0x%p.\n", | |
2586 | itp, itp->name, *stt); | |
2587 | *stt = NULL; | |
2588 | iscsi_unregister_transport(itp); | |
2589 | } | |
2590 | } | |
2591 | EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup); | |
2592 | ||
2593 | static int __init libcxgbi_init_module(void) | |
2594 | { | |
2595 | sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1; | |
2596 | sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1; | |
2597 | ||
2598 | pr_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n", | |
2599 | ISCSI_ITT_MASK, sw_tag_idx_bits, | |
2600 | ISCSI_AGE_MASK, sw_tag_age_bits); | |
2601 | ||
2602 | ddp_setup_host_page_size(); | |
2603 | return 0; | |
2604 | } | |
2605 | ||
2606 | static void __exit libcxgbi_exit_module(void) | |
2607 | { | |
2608 | cxgbi_device_unregister_all(0xFF); | |
2609 | return; | |
2610 | } | |
2611 | ||
2612 | module_init(libcxgbi_init_module); | |
2613 | module_exit(libcxgbi_exit_module); |