9ba682f0 |
1 | /* |
2 | * libcxgbi.c: Chelsio common library for T3/T4 iSCSI driver. |
3 | * |
4 | * Copyright (c) 2010 Chelsio Communications, Inc. |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License as published by |
8 | * the Free Software Foundation. |
9 | * |
10 | * Written by: Karen Xie (kxie@chelsio.com) |
11 | * Written by: Rakesh Ranjan (rranjan@chelsio.com) |
12 | */ |
13 | |
14 | #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ |
15 | |
16 | #include <linux/skbuff.h> |
17 | #include <linux/crypto.h> |
18 | #include <linux/scatterlist.h> |
19 | #include <linux/pci.h> |
20 | #include <scsi/scsi.h> |
21 | #include <scsi/scsi_cmnd.h> |
22 | #include <scsi/scsi_host.h> |
23 | #include <linux/if_vlan.h> |
24 | #include <linux/inet.h> |
25 | #include <net/dst.h> |
26 | #include <net/route.h> |
27 | #include <linux/inetdevice.h> /* ip_dev_find */ |
28 | #include <net/tcp.h> |
29 | |
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 | { |
0b3d8947 |
198 | struct net_device *vdev = NULL; |
9ba682f0 |
199 | struct cxgbi_device *cdev, *tmp; |
200 | int i; |
201 | |
0b3d8947 |
202 | if (ndev->priv_flags & IFF_802_1Q_VLAN) { |
203 | vdev = ndev; |
9ba682f0 |
204 | ndev = vlan_dev_real_dev(ndev); |
0b3d8947 |
205 | log_debug(1 << CXGBI_DBG_DEV, |
206 | "vlan dev %s -> %s.\n", vdev->name, ndev->name); |
207 | } |
9ba682f0 |
208 | |
209 | mutex_lock(&cdev_mutex); |
210 | list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) { |
211 | for (i = 0; i < cdev->nports; i++) { |
212 | if (ndev == cdev->ports[i]) { |
0b3d8947 |
213 | cdev->hbas[i]->vdev = vdev; |
9ba682f0 |
214 | mutex_unlock(&cdev_mutex); |
215 | if (port) |
216 | *port = i; |
217 | return cdev; |
218 | } |
219 | } |
220 | } |
221 | mutex_unlock(&cdev_mutex); |
222 | log_debug(1 << CXGBI_DBG_DEV, |
223 | "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name); |
224 | return NULL; |
225 | } |
226 | |
9ba682f0 |
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 | |
273447b3 |
473 | if (ip_route_output_flow(&init_net, &rt, &fl, NULL)) |
9ba682f0 |
474 | return NULL; |
475 | |
476 | return rt; |
477 | } |
478 | |
479 | static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr) |
480 | { |
481 | struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr; |
482 | struct dst_entry *dst; |
483 | struct net_device *ndev; |
484 | struct cxgbi_device *cdev; |
485 | struct rtable *rt = NULL; |
486 | struct cxgbi_sock *csk = NULL; |
487 | unsigned int mtu = 0; |
488 | int port = 0xFFFF; |
489 | int err = 0; |
490 | |
491 | if (daddr->sin_family != AF_INET) { |
492 | pr_info("address family 0x%x NOT supported.\n", |
493 | daddr->sin_family); |
494 | err = -EAFNOSUPPORT; |
495 | goto err_out; |
496 | } |
497 | |
498 | rt = find_route_ipv4(0, daddr->sin_addr.s_addr, 0, daddr->sin_port, 0); |
499 | if (!rt) { |
500 | pr_info("no route to ipv4 0x%x, port %u.\n", |
501 | daddr->sin_addr.s_addr, daddr->sin_port); |
502 | err = -ENETUNREACH; |
503 | goto err_out; |
504 | } |
505 | dst = &rt->dst; |
506 | ndev = dst->neighbour->dev; |
507 | |
508 | if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) { |
509 | pr_info("multi-cast route %pI4, port %u, dev %s.\n", |
510 | &daddr->sin_addr.s_addr, ntohs(daddr->sin_port), |
511 | ndev->name); |
512 | err = -ENETUNREACH; |
513 | goto rel_rt; |
514 | } |
515 | |
516 | if (ndev->flags & IFF_LOOPBACK) { |
517 | ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr); |
518 | mtu = ndev->mtu; |
519 | pr_info("rt dev %s, loopback -> %s, mtu %u.\n", |
520 | dst->neighbour->dev->name, ndev->name, mtu); |
521 | } |
522 | |
9ba682f0 |
523 | cdev = cxgbi_device_find_by_netdev(ndev, &port); |
524 | if (!cdev) { |
525 | pr_info("dst %pI4, %s, NOT cxgbi device.\n", |
526 | &daddr->sin_addr.s_addr, ndev->name); |
527 | err = -ENETUNREACH; |
528 | goto rel_rt; |
529 | } |
530 | log_debug(1 << CXGBI_DBG_SOCK, |
531 | "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n", |
532 | &daddr->sin_addr.s_addr, ntohs(daddr->sin_port), |
533 | port, ndev->name, cdev); |
534 | |
535 | csk = cxgbi_sock_create(cdev); |
536 | if (!csk) { |
537 | err = -ENOMEM; |
538 | goto rel_rt; |
539 | } |
540 | csk->cdev = cdev; |
541 | csk->port_id = port; |
542 | csk->mtu = mtu; |
543 | csk->dst = dst; |
544 | csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr; |
545 | csk->daddr.sin_port = daddr->sin_port; |
0b3d8947 |
546 | csk->saddr.sin_addr.s_addr = rt->rt_src; |
9ba682f0 |
547 | |
548 | return csk; |
549 | |
550 | rel_rt: |
551 | ip_rt_put(rt); |
552 | if (csk) |
553 | cxgbi_sock_closed(csk); |
554 | err_out: |
555 | return ERR_PTR(err); |
556 | } |
557 | |
558 | void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn, |
559 | unsigned int opt) |
560 | { |
561 | csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn; |
562 | dst_confirm(csk->dst); |
563 | smp_mb(); |
564 | cxgbi_sock_set_state(csk, CTP_ESTABLISHED); |
565 | } |
566 | EXPORT_SYMBOL_GPL(cxgbi_sock_established); |
567 | |
568 | static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk) |
569 | { |
570 | log_debug(1 << CXGBI_DBG_SOCK, |
571 | "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n", |
572 | csk, csk->state, csk->flags, csk->user_data); |
573 | |
574 | if (csk->state != CTP_ESTABLISHED) { |
e3d2ad8c |
575 | read_lock_bh(&csk->callback_lock); |
9ba682f0 |
576 | if (csk->user_data) |
577 | iscsi_conn_failure(csk->user_data, |
578 | ISCSI_ERR_CONN_FAILED); |
e3d2ad8c |
579 | read_unlock_bh(&csk->callback_lock); |
9ba682f0 |
580 | } |
581 | } |
582 | |
583 | void cxgbi_sock_closed(struct cxgbi_sock *csk) |
584 | { |
585 | log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n", |
586 | csk, (csk)->state, (csk)->flags, (csk)->tid); |
587 | cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED); |
588 | if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED) |
589 | return; |
590 | if (csk->saddr.sin_port) |
591 | sock_put_port(csk); |
592 | if (csk->dst) |
593 | dst_release(csk->dst); |
594 | csk->cdev->csk_release_offload_resources(csk); |
595 | cxgbi_sock_set_state(csk, CTP_CLOSED); |
596 | cxgbi_inform_iscsi_conn_closing(csk); |
597 | cxgbi_sock_put(csk); |
598 | } |
599 | EXPORT_SYMBOL_GPL(cxgbi_sock_closed); |
600 | |
601 | static void need_active_close(struct cxgbi_sock *csk) |
602 | { |
603 | int data_lost; |
604 | int close_req = 0; |
605 | |
606 | log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n", |
607 | csk, (csk)->state, (csk)->flags, (csk)->tid); |
608 | spin_lock_bh(&csk->lock); |
609 | dst_confirm(csk->dst); |
610 | data_lost = skb_queue_len(&csk->receive_queue); |
611 | __skb_queue_purge(&csk->receive_queue); |
612 | |
613 | if (csk->state == CTP_ACTIVE_OPEN) |
614 | cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED); |
615 | else if (csk->state == CTP_ESTABLISHED) { |
616 | close_req = 1; |
617 | cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE); |
618 | } else if (csk->state == CTP_PASSIVE_CLOSE) { |
619 | close_req = 1; |
620 | cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2); |
621 | } |
622 | |
623 | if (close_req) { |
624 | if (data_lost) |
625 | csk->cdev->csk_send_abort_req(csk); |
626 | else |
627 | csk->cdev->csk_send_close_req(csk); |
628 | } |
629 | |
630 | spin_unlock_bh(&csk->lock); |
631 | } |
632 | |
633 | void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno) |
634 | { |
635 | pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n", |
636 | csk, csk->state, csk->flags, |
637 | &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port, |
638 | &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port, |
639 | errno); |
640 | |
641 | cxgbi_sock_set_state(csk, CTP_CONNECTING); |
642 | csk->err = errno; |
643 | cxgbi_sock_closed(csk); |
644 | } |
645 | EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open); |
646 | |
647 | void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb) |
648 | { |
649 | struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk; |
650 | |
651 | log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n", |
652 | csk, (csk)->state, (csk)->flags, (csk)->tid); |
653 | cxgbi_sock_get(csk); |
654 | spin_lock_bh(&csk->lock); |
655 | if (csk->state == CTP_ACTIVE_OPEN) |
656 | cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH); |
657 | spin_unlock_bh(&csk->lock); |
658 | cxgbi_sock_put(csk); |
659 | __kfree_skb(skb); |
660 | } |
661 | EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure); |
662 | |
663 | void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk) |
664 | { |
665 | cxgbi_sock_get(csk); |
666 | spin_lock_bh(&csk->lock); |
667 | if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) { |
668 | if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_RCVD)) |
669 | cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD); |
670 | else { |
671 | cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_RCVD); |
672 | cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING); |
673 | if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD)) |
674 | pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n", |
675 | csk, csk->state, csk->flags, csk->tid); |
676 | cxgbi_sock_closed(csk); |
677 | } |
678 | } |
679 | spin_unlock_bh(&csk->lock); |
680 | cxgbi_sock_put(csk); |
681 | } |
682 | EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl); |
683 | |
684 | void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk) |
685 | { |
686 | log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n", |
687 | csk, (csk)->state, (csk)->flags, (csk)->tid); |
688 | cxgbi_sock_get(csk); |
689 | spin_lock_bh(&csk->lock); |
690 | |
691 | if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) |
692 | goto done; |
693 | |
694 | switch (csk->state) { |
695 | case CTP_ESTABLISHED: |
696 | cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE); |
697 | break; |
698 | case CTP_ACTIVE_CLOSE: |
699 | cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2); |
700 | break; |
701 | case CTP_CLOSE_WAIT_1: |
702 | cxgbi_sock_closed(csk); |
703 | break; |
704 | case CTP_ABORTING: |
705 | break; |
706 | default: |
707 | pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n", |
708 | csk, csk->state, csk->flags, csk->tid); |
709 | } |
710 | cxgbi_inform_iscsi_conn_closing(csk); |
711 | done: |
712 | spin_unlock_bh(&csk->lock); |
713 | cxgbi_sock_put(csk); |
714 | } |
715 | EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close); |
716 | |
717 | void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt) |
718 | { |
719 | log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n", |
720 | csk, (csk)->state, (csk)->flags, (csk)->tid); |
721 | cxgbi_sock_get(csk); |
722 | spin_lock_bh(&csk->lock); |
723 | |
724 | csk->snd_una = snd_nxt - 1; |
725 | if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) |
726 | goto done; |
727 | |
728 | switch (csk->state) { |
729 | case CTP_ACTIVE_CLOSE: |
730 | cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1); |
731 | break; |
732 | case CTP_CLOSE_WAIT_1: |
733 | case CTP_CLOSE_WAIT_2: |
734 | cxgbi_sock_closed(csk); |
735 | break; |
736 | case CTP_ABORTING: |
737 | break; |
738 | default: |
739 | pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n", |
740 | csk, csk->state, csk->flags, csk->tid); |
741 | } |
742 | done: |
743 | spin_unlock_bh(&csk->lock); |
744 | cxgbi_sock_put(csk); |
745 | } |
746 | EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl); |
747 | |
748 | void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits, |
749 | unsigned int snd_una, int seq_chk) |
750 | { |
751 | log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK, |
752 | "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n", |
753 | csk, csk->state, csk->flags, csk->tid, credits, |
754 | csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk); |
755 | |
756 | spin_lock_bh(&csk->lock); |
757 | |
758 | csk->wr_cred += credits; |
759 | if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred) |
760 | csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred; |
761 | |
762 | while (credits) { |
763 | struct sk_buff *p = cxgbi_sock_peek_wr(csk); |
764 | |
765 | if (unlikely(!p)) { |
766 | pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n", |
767 | csk, csk->state, csk->flags, csk->tid, credits, |
768 | csk->wr_cred, csk->wr_una_cred); |
769 | break; |
770 | } |
771 | |
772 | if (unlikely(credits < p->csum)) { |
773 | pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n", |
774 | csk, csk->state, csk->flags, csk->tid, |
775 | credits, csk->wr_cred, csk->wr_una_cred, |
776 | p->csum); |
777 | p->csum -= credits; |
778 | break; |
779 | } else { |
780 | cxgbi_sock_dequeue_wr(csk); |
781 | credits -= p->csum; |
782 | kfree_skb(p); |
783 | } |
784 | } |
785 | |
786 | cxgbi_sock_check_wr_invariants(csk); |
787 | |
788 | if (seq_chk) { |
789 | if (unlikely(before(snd_una, csk->snd_una))) { |
790 | pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.", |
791 | csk, csk->state, csk->flags, csk->tid, snd_una, |
792 | csk->snd_una); |
793 | goto done; |
794 | } |
795 | |
796 | if (csk->snd_una != snd_una) { |
797 | csk->snd_una = snd_una; |
798 | dst_confirm(csk->dst); |
799 | } |
800 | } |
801 | |
802 | if (skb_queue_len(&csk->write_queue)) { |
803 | if (csk->cdev->csk_push_tx_frames(csk, 0)) |
804 | cxgbi_conn_tx_open(csk); |
805 | } else |
806 | cxgbi_conn_tx_open(csk); |
807 | done: |
808 | spin_unlock_bh(&csk->lock); |
809 | } |
810 | EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack); |
811 | |
812 | static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk, |
813 | unsigned short mtu) |
814 | { |
815 | int i = 0; |
816 | |
817 | while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu) |
818 | ++i; |
819 | |
820 | return i; |
821 | } |
822 | |
823 | unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu) |
824 | { |
825 | unsigned int idx; |
826 | struct dst_entry *dst = csk->dst; |
827 | |
0dbaee3b |
828 | csk->advmss = dst_metric_advmss(dst); |
9ba682f0 |
829 | |
830 | if (csk->advmss > pmtu - 40) |
831 | csk->advmss = pmtu - 40; |
832 | if (csk->advmss < csk->cdev->mtus[0] - 40) |
833 | csk->advmss = csk->cdev->mtus[0] - 40; |
834 | idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40); |
835 | |
836 | return idx; |
837 | } |
838 | EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss); |
839 | |
840 | void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb) |
841 | { |
842 | cxgbi_skcb_tcp_seq(skb) = csk->write_seq; |
843 | __skb_queue_tail(&csk->write_queue, skb); |
844 | } |
845 | EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail); |
846 | |
847 | void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk) |
848 | { |
849 | struct sk_buff *skb; |
850 | |
851 | while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL) |
852 | kfree_skb(skb); |
853 | } |
854 | EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue); |
855 | |
856 | void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk) |
857 | { |
858 | int pending = cxgbi_sock_count_pending_wrs(csk); |
859 | |
860 | if (unlikely(csk->wr_cred + pending != csk->wr_max_cred)) |
861 | pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n", |
862 | csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred); |
863 | } |
864 | EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants); |
865 | |
866 | static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb) |
867 | { |
868 | struct cxgbi_device *cdev = csk->cdev; |
869 | struct sk_buff *next; |
870 | int err, copied = 0; |
871 | |
872 | spin_lock_bh(&csk->lock); |
873 | |
874 | if (csk->state != CTP_ESTABLISHED) { |
875 | log_debug(1 << CXGBI_DBG_PDU_TX, |
876 | "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n", |
877 | csk, csk->state, csk->flags, csk->tid); |
878 | err = -EAGAIN; |
879 | goto out_err; |
880 | } |
881 | |
882 | if (csk->err) { |
883 | log_debug(1 << CXGBI_DBG_PDU_TX, |
884 | "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n", |
885 | csk, csk->state, csk->flags, csk->tid, csk->err); |
886 | err = -EPIPE; |
887 | goto out_err; |
888 | } |
889 | |
890 | if (csk->write_seq - csk->snd_una >= cdev->snd_win) { |
891 | log_debug(1 << CXGBI_DBG_PDU_TX, |
892 | "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n", |
893 | csk, csk->state, csk->flags, csk->tid, csk->write_seq, |
894 | csk->snd_una, cdev->snd_win); |
895 | err = -ENOBUFS; |
896 | goto out_err; |
897 | } |
898 | |
899 | while (skb) { |
900 | int frags = skb_shinfo(skb)->nr_frags + |
901 | (skb->len != skb->data_len); |
902 | |
903 | if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) { |
904 | pr_err("csk 0x%p, skb head %u < %u.\n", |
905 | csk, skb_headroom(skb), cdev->skb_tx_rsvd); |
906 | err = -EINVAL; |
907 | goto out_err; |
908 | } |
909 | |
910 | if (frags >= SKB_WR_LIST_SIZE) { |
911 | pr_err("csk 0x%p, frags %d, %u,%u >%u.\n", |
912 | csk, skb_shinfo(skb)->nr_frags, skb->len, |
913 | skb->data_len, (uint)(SKB_WR_LIST_SIZE)); |
914 | err = -EINVAL; |
915 | goto out_err; |
916 | } |
917 | |
918 | next = skb->next; |
919 | skb->next = NULL; |
920 | cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR); |
921 | cxgbi_sock_skb_entail(csk, skb); |
922 | copied += skb->len; |
923 | csk->write_seq += skb->len + |
924 | cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb)); |
925 | skb = next; |
926 | } |
927 | done: |
928 | if (likely(skb_queue_len(&csk->write_queue))) |
929 | cdev->csk_push_tx_frames(csk, 1); |
930 | spin_unlock_bh(&csk->lock); |
931 | return copied; |
932 | |
933 | out_err: |
934 | if (copied == 0 && err == -EPIPE) |
935 | copied = csk->err ? csk->err : -EPIPE; |
936 | else |
937 | copied = err; |
938 | goto done; |
939 | } |
940 | |
941 | /* |
942 | * Direct Data Placement - |
943 | * Directly place the iSCSI Data-In or Data-Out PDU's payload into pre-posted |
944 | * final destination host-memory buffers based on the Initiator Task Tag (ITT) |
945 | * in Data-In or Target Task Tag (TTT) in Data-Out PDUs. |
946 | * The host memory address is programmed into h/w in the format of pagepod |
947 | * entries. |
948 | * The location of the pagepod entry is encoded into ddp tag which is used as |
949 | * the base for ITT/TTT. |
950 | */ |
951 | |
952 | static unsigned char ddp_page_order[DDP_PGIDX_MAX] = {0, 1, 2, 4}; |
953 | static unsigned char ddp_page_shift[DDP_PGIDX_MAX] = {12, 13, 14, 16}; |
954 | static unsigned char page_idx = DDP_PGIDX_MAX; |
955 | |
956 | static unsigned char sw_tag_idx_bits; |
957 | static unsigned char sw_tag_age_bits; |
958 | |
959 | /* |
960 | * Direct-Data Placement page size adjustment |
961 | */ |
962 | static int ddp_adjust_page_table(void) |
963 | { |
964 | int i; |
965 | unsigned int base_order, order; |
966 | |
967 | if (PAGE_SIZE < (1UL << ddp_page_shift[0])) { |
968 | pr_info("PAGE_SIZE 0x%lx too small, min 0x%lx\n", |
969 | PAGE_SIZE, 1UL << ddp_page_shift[0]); |
970 | return -EINVAL; |
971 | } |
972 | |
973 | base_order = get_order(1UL << ddp_page_shift[0]); |
974 | order = get_order(1UL << PAGE_SHIFT); |
975 | |
976 | for (i = 0; i < DDP_PGIDX_MAX; i++) { |
977 | /* first is the kernel page size, then just doubling */ |
978 | ddp_page_order[i] = order - base_order + i; |
979 | ddp_page_shift[i] = PAGE_SHIFT + i; |
980 | } |
981 | return 0; |
982 | } |
983 | |
984 | static int ddp_find_page_index(unsigned long pgsz) |
985 | { |
986 | int i; |
987 | |
988 | for (i = 0; i < DDP_PGIDX_MAX; i++) { |
989 | if (pgsz == (1UL << ddp_page_shift[i])) |
990 | return i; |
991 | } |
992 | pr_info("ddp page size %lu not supported.\n", pgsz); |
993 | return DDP_PGIDX_MAX; |
994 | } |
995 | |
996 | static void ddp_setup_host_page_size(void) |
997 | { |
998 | if (page_idx == DDP_PGIDX_MAX) { |
999 | page_idx = ddp_find_page_index(PAGE_SIZE); |
1000 | |
1001 | if (page_idx == DDP_PGIDX_MAX) { |
1002 | pr_info("system PAGE %lu, update hw.\n", PAGE_SIZE); |
1003 | if (ddp_adjust_page_table() < 0) { |
1004 | pr_info("PAGE %lu, disable ddp.\n", PAGE_SIZE); |
1005 | return; |
1006 | } |
1007 | page_idx = ddp_find_page_index(PAGE_SIZE); |
1008 | } |
1009 | pr_info("system PAGE %lu, ddp idx %u.\n", PAGE_SIZE, page_idx); |
1010 | } |
1011 | } |
1012 | |
1013 | void cxgbi_ddp_page_size_factor(int *pgsz_factor) |
1014 | { |
1015 | int i; |
1016 | |
1017 | for (i = 0; i < DDP_PGIDX_MAX; i++) |
1018 | pgsz_factor[i] = ddp_page_order[i]; |
1019 | } |
1020 | EXPORT_SYMBOL_GPL(cxgbi_ddp_page_size_factor); |
1021 | |
1022 | /* |
1023 | * DDP setup & teardown |
1024 | */ |
1025 | |
1026 | void cxgbi_ddp_ppod_set(struct cxgbi_pagepod *ppod, |
1027 | struct cxgbi_pagepod_hdr *hdr, |
1028 | struct cxgbi_gather_list *gl, unsigned int gidx) |
1029 | { |
1030 | int i; |
1031 | |
1032 | memcpy(ppod, hdr, sizeof(*hdr)); |
1033 | for (i = 0; i < (PPOD_PAGES_MAX + 1); i++, gidx++) { |
1034 | ppod->addr[i] = gidx < gl->nelem ? |
1035 | cpu_to_be64(gl->phys_addr[gidx]) : 0ULL; |
1036 | } |
1037 | } |
1038 | EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_set); |
1039 | |
1040 | void cxgbi_ddp_ppod_clear(struct cxgbi_pagepod *ppod) |
1041 | { |
1042 | memset(ppod, 0, sizeof(*ppod)); |
1043 | } |
1044 | EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_clear); |
1045 | |
1046 | static inline int ddp_find_unused_entries(struct cxgbi_ddp_info *ddp, |
1047 | unsigned int start, unsigned int max, |
1048 | unsigned int count, |
1049 | struct cxgbi_gather_list *gl) |
1050 | { |
1051 | unsigned int i, j, k; |
1052 | |
1053 | /* not enough entries */ |
1054 | if ((max - start) < count) { |
1055 | log_debug(1 << CXGBI_DBG_DDP, |
1056 | "NOT enough entries %u+%u < %u.\n", start, count, max); |
1057 | return -EBUSY; |
1058 | } |
1059 | |
1060 | max -= count; |
1061 | spin_lock(&ddp->map_lock); |
1062 | for (i = start; i < max;) { |
1063 | for (j = 0, k = i; j < count; j++, k++) { |
1064 | if (ddp->gl_map[k]) |
1065 | break; |
1066 | } |
1067 | if (j == count) { |
1068 | for (j = 0, k = i; j < count; j++, k++) |
1069 | ddp->gl_map[k] = gl; |
1070 | spin_unlock(&ddp->map_lock); |
1071 | return i; |
1072 | } |
1073 | i += j + 1; |
1074 | } |
1075 | spin_unlock(&ddp->map_lock); |
1076 | log_debug(1 << CXGBI_DBG_DDP, |
1077 | "NO suitable entries %u available.\n", count); |
1078 | return -EBUSY; |
1079 | } |
1080 | |
1081 | static inline void ddp_unmark_entries(struct cxgbi_ddp_info *ddp, |
1082 | int start, int count) |
1083 | { |
1084 | spin_lock(&ddp->map_lock); |
1085 | memset(&ddp->gl_map[start], 0, |
1086 | count * sizeof(struct cxgbi_gather_list *)); |
1087 | spin_unlock(&ddp->map_lock); |
1088 | } |
1089 | |
1090 | static inline void ddp_gl_unmap(struct pci_dev *pdev, |
1091 | struct cxgbi_gather_list *gl) |
1092 | { |
1093 | int i; |
1094 | |
1095 | for (i = 0; i < gl->nelem; i++) |
1096 | dma_unmap_page(&pdev->dev, gl->phys_addr[i], PAGE_SIZE, |
1097 | PCI_DMA_FROMDEVICE); |
1098 | } |
1099 | |
1100 | static inline int ddp_gl_map(struct pci_dev *pdev, |
1101 | struct cxgbi_gather_list *gl) |
1102 | { |
1103 | int i; |
1104 | |
1105 | for (i = 0; i < gl->nelem; i++) { |
1106 | gl->phys_addr[i] = dma_map_page(&pdev->dev, gl->pages[i], 0, |
1107 | PAGE_SIZE, |
1108 | PCI_DMA_FROMDEVICE); |
1109 | if (unlikely(dma_mapping_error(&pdev->dev, gl->phys_addr[i]))) { |
1110 | log_debug(1 << CXGBI_DBG_DDP, |
1111 | "page %d 0x%p, 0x%p dma mapping err.\n", |
1112 | i, gl->pages[i], pdev); |
1113 | goto unmap; |
1114 | } |
1115 | } |
1116 | return i; |
1117 | unmap: |
1118 | if (i) { |
1119 | unsigned int nelem = gl->nelem; |
1120 | |
1121 | gl->nelem = i; |
1122 | ddp_gl_unmap(pdev, gl); |
1123 | gl->nelem = nelem; |
1124 | } |
1125 | return -EINVAL; |
1126 | } |
1127 | |
1128 | static void ddp_release_gl(struct cxgbi_gather_list *gl, |
1129 | struct pci_dev *pdev) |
1130 | { |
1131 | ddp_gl_unmap(pdev, gl); |
1132 | kfree(gl); |
1133 | } |
1134 | |
1135 | static struct cxgbi_gather_list *ddp_make_gl(unsigned int xferlen, |
1136 | struct scatterlist *sgl, |
1137 | unsigned int sgcnt, |
1138 | struct pci_dev *pdev, |
1139 | gfp_t gfp) |
1140 | { |
1141 | struct cxgbi_gather_list *gl; |
1142 | struct scatterlist *sg = sgl; |
1143 | struct page *sgpage = sg_page(sg); |
1144 | unsigned int sglen = sg->length; |
1145 | unsigned int sgoffset = sg->offset; |
1146 | unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >> |
1147 | PAGE_SHIFT; |
1148 | int i = 1, j = 0; |
1149 | |
1150 | if (xferlen < DDP_THRESHOLD) { |
1151 | log_debug(1 << CXGBI_DBG_DDP, |
1152 | "xfer %u < threshold %u, no ddp.\n", |
1153 | xferlen, DDP_THRESHOLD); |
1154 | return NULL; |
1155 | } |
1156 | |
1157 | gl = kzalloc(sizeof(struct cxgbi_gather_list) + |
1158 | npages * (sizeof(dma_addr_t) + |
1159 | sizeof(struct page *)), gfp); |
1160 | if (!gl) { |
1161 | log_debug(1 << CXGBI_DBG_DDP, |
1162 | "xfer %u, %u pages, OOM.\n", xferlen, npages); |
1163 | return NULL; |
1164 | } |
1165 | |
1166 | log_debug(1 << CXGBI_DBG_DDP, |
1167 | "xfer %u, sgl %u, gl max %u.\n", xferlen, sgcnt, npages); |
1168 | |
1169 | gl->pages = (struct page **)&gl->phys_addr[npages]; |
1170 | gl->nelem = npages; |
1171 | gl->length = xferlen; |
1172 | gl->offset = sgoffset; |
1173 | gl->pages[0] = sgpage; |
1174 | |
1175 | for (i = 1, sg = sg_next(sgl), j = 0; i < sgcnt; |
1176 | i++, sg = sg_next(sg)) { |
1177 | struct page *page = sg_page(sg); |
1178 | |
1179 | if (sgpage == page && sg->offset == sgoffset + sglen) |
1180 | sglen += sg->length; |
1181 | else { |
1182 | /* make sure the sgl is fit for ddp: |
1183 | * each has the same page size, and |
1184 | * all of the middle pages are used completely |
1185 | */ |
1186 | if ((j && sgoffset) || ((i != sgcnt - 1) && |
1187 | ((sglen + sgoffset) & ~PAGE_MASK))) { |
1188 | log_debug(1 << CXGBI_DBG_DDP, |
1189 | "page %d/%u, %u + %u.\n", |
1190 | i, sgcnt, sgoffset, sglen); |
1191 | goto error_out; |
1192 | } |
1193 | |
1194 | j++; |
1195 | if (j == gl->nelem || sg->offset) { |
1196 | log_debug(1 << CXGBI_DBG_DDP, |
1197 | "page %d/%u, offset %u.\n", |
1198 | j, gl->nelem, sg->offset); |
1199 | goto error_out; |
1200 | } |
1201 | gl->pages[j] = page; |
1202 | sglen = sg->length; |
1203 | sgoffset = sg->offset; |
1204 | sgpage = page; |
1205 | } |
1206 | } |
1207 | gl->nelem = ++j; |
1208 | |
1209 | if (ddp_gl_map(pdev, gl) < 0) |
1210 | goto error_out; |
1211 | |
1212 | return gl; |
1213 | |
1214 | error_out: |
1215 | kfree(gl); |
1216 | return NULL; |
1217 | } |
1218 | |
1219 | static void ddp_tag_release(struct cxgbi_hba *chba, u32 tag) |
1220 | { |
1221 | struct cxgbi_device *cdev = chba->cdev; |
1222 | struct cxgbi_ddp_info *ddp = cdev->ddp; |
1223 | u32 idx; |
1224 | |
1225 | idx = (tag >> PPOD_IDX_SHIFT) & ddp->idx_mask; |
1226 | if (idx < ddp->nppods) { |
1227 | struct cxgbi_gather_list *gl = ddp->gl_map[idx]; |
1228 | unsigned int npods; |
1229 | |
1230 | if (!gl || !gl->nelem) { |
1231 | pr_warn("tag 0x%x, idx %u, gl 0x%p, %u.\n", |
1232 | tag, idx, gl, gl ? gl->nelem : 0); |
1233 | return; |
1234 | } |
1235 | npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT; |
1236 | log_debug(1 << CXGBI_DBG_DDP, |
1237 | "tag 0x%x, release idx %u, npods %u.\n", |
1238 | tag, idx, npods); |
1239 | cdev->csk_ddp_clear(chba, tag, idx, npods); |
1240 | ddp_unmark_entries(ddp, idx, npods); |
1241 | ddp_release_gl(gl, ddp->pdev); |
1242 | } else |
1243 | pr_warn("tag 0x%x, idx %u > max %u.\n", tag, idx, ddp->nppods); |
1244 | } |
1245 | |
1246 | static int ddp_tag_reserve(struct cxgbi_sock *csk, unsigned int tid, |
1247 | u32 sw_tag, u32 *tagp, struct cxgbi_gather_list *gl, |
1248 | gfp_t gfp) |
1249 | { |
1250 | struct cxgbi_device *cdev = csk->cdev; |
1251 | struct cxgbi_ddp_info *ddp = cdev->ddp; |
1252 | struct cxgbi_tag_format *tformat = &cdev->tag_format; |
1253 | struct cxgbi_pagepod_hdr hdr; |
1254 | unsigned int npods; |
1255 | int idx = -1; |
1256 | int err = -ENOMEM; |
1257 | u32 tag; |
1258 | |
1259 | npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT; |
1260 | if (ddp->idx_last == ddp->nppods) |
1261 | idx = ddp_find_unused_entries(ddp, 0, ddp->nppods, |
1262 | npods, gl); |
1263 | else { |
1264 | idx = ddp_find_unused_entries(ddp, ddp->idx_last + 1, |
1265 | ddp->nppods, npods, |
1266 | gl); |
1267 | if (idx < 0 && ddp->idx_last >= npods) { |
1268 | idx = ddp_find_unused_entries(ddp, 0, |
1269 | min(ddp->idx_last + npods, ddp->nppods), |
1270 | npods, gl); |
1271 | } |
1272 | } |
1273 | if (idx < 0) { |
1274 | log_debug(1 << CXGBI_DBG_DDP, |
1275 | "xferlen %u, gl %u, npods %u NO DDP.\n", |
1276 | gl->length, gl->nelem, npods); |
1277 | return idx; |
1278 | } |
1279 | |
1280 | if (cdev->csk_ddp_alloc_gl_skb) { |
1281 | err = cdev->csk_ddp_alloc_gl_skb(ddp, idx, npods, gfp); |
1282 | if (err < 0) |
1283 | goto unmark_entries; |
1284 | } |
1285 | |
1286 | tag = cxgbi_ddp_tag_base(tformat, sw_tag); |
1287 | tag |= idx << PPOD_IDX_SHIFT; |
1288 | |
1289 | hdr.rsvd = 0; |
1290 | hdr.vld_tid = htonl(PPOD_VALID_FLAG | PPOD_TID(tid)); |
1291 | hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask); |
1292 | hdr.max_offset = htonl(gl->length); |
1293 | hdr.page_offset = htonl(gl->offset); |
1294 | |
1295 | err = cdev->csk_ddp_set(csk, &hdr, idx, npods, gl); |
1296 | if (err < 0) { |
1297 | if (cdev->csk_ddp_free_gl_skb) |
1298 | cdev->csk_ddp_free_gl_skb(ddp, idx, npods); |
1299 | goto unmark_entries; |
1300 | } |
1301 | |
1302 | ddp->idx_last = idx; |
1303 | log_debug(1 << CXGBI_DBG_DDP, |
1304 | "xfer %u, gl %u,%u, tid 0x%x, tag 0x%x->0x%x(%u,%u).\n", |
1305 | gl->length, gl->nelem, gl->offset, tid, sw_tag, tag, idx, |
1306 | npods); |
1307 | *tagp = tag; |
1308 | return 0; |
1309 | |
1310 | unmark_entries: |
1311 | ddp_unmark_entries(ddp, idx, npods); |
1312 | return err; |
1313 | } |
1314 | |
1315 | int cxgbi_ddp_reserve(struct cxgbi_sock *csk, unsigned int *tagp, |
1316 | unsigned int sw_tag, unsigned int xferlen, |
1317 | struct scatterlist *sgl, unsigned int sgcnt, gfp_t gfp) |
1318 | { |
1319 | struct cxgbi_device *cdev = csk->cdev; |
1320 | struct cxgbi_tag_format *tformat = &cdev->tag_format; |
1321 | struct cxgbi_gather_list *gl; |
1322 | int err; |
1323 | |
1324 | if (page_idx >= DDP_PGIDX_MAX || !cdev->ddp || |
1325 | xferlen < DDP_THRESHOLD) { |
1326 | log_debug(1 << CXGBI_DBG_DDP, |
1327 | "pgidx %u, xfer %u, NO ddp.\n", page_idx, xferlen); |
1328 | return -EINVAL; |
1329 | } |
1330 | |
1331 | if (!cxgbi_sw_tag_usable(tformat, sw_tag)) { |
1332 | log_debug(1 << CXGBI_DBG_DDP, |
1333 | "sw_tag 0x%x NOT usable.\n", sw_tag); |
1334 | return -EINVAL; |
1335 | } |
1336 | |
1337 | gl = ddp_make_gl(xferlen, sgl, sgcnt, cdev->pdev, gfp); |
1338 | if (!gl) |
1339 | return -ENOMEM; |
1340 | |
1341 | err = ddp_tag_reserve(csk, csk->tid, sw_tag, tagp, gl, gfp); |
1342 | if (err < 0) |
1343 | ddp_release_gl(gl, cdev->pdev); |
1344 | |
1345 | return err; |
1346 | } |
1347 | |
1348 | static void ddp_destroy(struct kref *kref) |
1349 | { |
1350 | struct cxgbi_ddp_info *ddp = container_of(kref, |
1351 | struct cxgbi_ddp_info, |
1352 | refcnt); |
1353 | struct cxgbi_device *cdev = ddp->cdev; |
1354 | int i = 0; |
1355 | |
1356 | pr_info("kref 0, destroy ddp 0x%p, cdev 0x%p.\n", ddp, cdev); |
1357 | |
1358 | while (i < ddp->nppods) { |
1359 | struct cxgbi_gather_list *gl = ddp->gl_map[i]; |
1360 | |
1361 | if (gl) { |
1362 | int npods = (gl->nelem + PPOD_PAGES_MAX - 1) |
1363 | >> PPOD_PAGES_SHIFT; |
1364 | pr_info("cdev 0x%p, ddp %d + %d.\n", cdev, i, npods); |
1365 | kfree(gl); |
1366 | if (cdev->csk_ddp_free_gl_skb) |
1367 | cdev->csk_ddp_free_gl_skb(ddp, i, npods); |
1368 | i += npods; |
1369 | } else |
1370 | i++; |
1371 | } |
1372 | cxgbi_free_big_mem(ddp); |
1373 | } |
1374 | |
1375 | int cxgbi_ddp_cleanup(struct cxgbi_device *cdev) |
1376 | { |
1377 | struct cxgbi_ddp_info *ddp = cdev->ddp; |
1378 | |
1379 | log_debug(1 << CXGBI_DBG_DDP, |
1380 | "cdev 0x%p, release ddp 0x%p.\n", cdev, ddp); |
1381 | cdev->ddp = NULL; |
1382 | if (ddp) |
1383 | return kref_put(&ddp->refcnt, ddp_destroy); |
1384 | return 0; |
1385 | } |
1386 | EXPORT_SYMBOL_GPL(cxgbi_ddp_cleanup); |
1387 | |
1388 | int cxgbi_ddp_init(struct cxgbi_device *cdev, |
1389 | unsigned int llimit, unsigned int ulimit, |
1390 | unsigned int max_txsz, unsigned int max_rxsz) |
1391 | { |
1392 | struct cxgbi_ddp_info *ddp; |
1393 | unsigned int ppmax, bits; |
1394 | |
1395 | ppmax = (ulimit - llimit + 1) >> PPOD_SIZE_SHIFT; |
1396 | bits = __ilog2_u32(ppmax) + 1; |
1397 | if (bits > PPOD_IDX_MAX_SIZE) |
1398 | bits = PPOD_IDX_MAX_SIZE; |
1399 | ppmax = (1 << (bits - 1)) - 1; |
1400 | |
1401 | ddp = cxgbi_alloc_big_mem(sizeof(struct cxgbi_ddp_info) + |
1402 | ppmax * (sizeof(struct cxgbi_gather_list *) + |
1403 | sizeof(struct sk_buff *)), |
1404 | GFP_KERNEL); |
1405 | if (!ddp) { |
1406 | pr_warn("cdev 0x%p, ddp ppmax %u OOM.\n", cdev, ppmax); |
1407 | return -ENOMEM; |
1408 | } |
1409 | ddp->gl_map = (struct cxgbi_gather_list **)(ddp + 1); |
1410 | ddp->gl_skb = (struct sk_buff **)(((char *)ddp->gl_map) + |
1411 | ppmax * sizeof(struct cxgbi_gather_list *)); |
1412 | cdev->ddp = ddp; |
1413 | |
1414 | spin_lock_init(&ddp->map_lock); |
1415 | kref_init(&ddp->refcnt); |
1416 | |
1417 | ddp->cdev = cdev; |
1418 | ddp->pdev = cdev->pdev; |
1419 | ddp->llimit = llimit; |
1420 | ddp->ulimit = ulimit; |
1421 | ddp->max_txsz = min_t(unsigned int, max_txsz, ULP2_MAX_PKT_SIZE); |
1422 | ddp->max_rxsz = min_t(unsigned int, max_rxsz, ULP2_MAX_PKT_SIZE); |
1423 | ddp->nppods = ppmax; |
1424 | ddp->idx_last = ppmax; |
1425 | ddp->idx_bits = bits; |
1426 | ddp->idx_mask = (1 << bits) - 1; |
1427 | ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1; |
1428 | |
1429 | cdev->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits; |
1430 | cdev->tag_format.rsvd_bits = ddp->idx_bits; |
1431 | cdev->tag_format.rsvd_shift = PPOD_IDX_SHIFT; |
1432 | cdev->tag_format.rsvd_mask = (1 << cdev->tag_format.rsvd_bits) - 1; |
1433 | |
1434 | pr_info("%s tag format, sw %u, rsvd %u,%u, mask 0x%x.\n", |
1435 | cdev->ports[0]->name, cdev->tag_format.sw_bits, |
1436 | cdev->tag_format.rsvd_bits, cdev->tag_format.rsvd_shift, |
1437 | cdev->tag_format.rsvd_mask); |
1438 | |
1439 | cdev->tx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD, |
1440 | ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN); |
1441 | cdev->rx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD, |
1442 | ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN); |
1443 | |
1444 | log_debug(1 << CXGBI_DBG_DDP, |
1445 | "%s max payload size: %u/%u, %u/%u.\n", |
1446 | cdev->ports[0]->name, cdev->tx_max_size, ddp->max_txsz, |
1447 | cdev->rx_max_size, ddp->max_rxsz); |
1448 | return 0; |
1449 | } |
1450 | EXPORT_SYMBOL_GPL(cxgbi_ddp_init); |
1451 | |
1452 | /* |
1453 | * APIs interacting with open-iscsi libraries |
1454 | */ |
1455 | |
1456 | static unsigned char padding[4]; |
1457 | |
1458 | static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt) |
1459 | { |
1460 | struct scsi_cmnd *sc = task->sc; |
1461 | struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data; |
1462 | struct cxgbi_conn *cconn = tcp_conn->dd_data; |
1463 | struct cxgbi_hba *chba = cconn->chba; |
1464 | struct cxgbi_tag_format *tformat = &chba->cdev->tag_format; |
1465 | u32 tag = ntohl((__force u32)hdr_itt); |
1466 | |
1467 | log_debug(1 << CXGBI_DBG_DDP, |
1468 | "cdev 0x%p, release tag 0x%x.\n", chba->cdev, tag); |
1469 | if (sc && |
1470 | (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) && |
1471 | cxgbi_is_ddp_tag(tformat, tag)) |
1472 | ddp_tag_release(chba, tag); |
1473 | } |
1474 | |
1475 | static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt) |
1476 | { |
1477 | struct scsi_cmnd *sc = task->sc; |
1478 | struct iscsi_conn *conn = task->conn; |
1479 | struct iscsi_session *sess = conn->session; |
1480 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1481 | struct cxgbi_conn *cconn = tcp_conn->dd_data; |
1482 | struct cxgbi_hba *chba = cconn->chba; |
1483 | struct cxgbi_tag_format *tformat = &chba->cdev->tag_format; |
1484 | u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt; |
1485 | u32 tag = 0; |
1486 | int err = -EINVAL; |
1487 | |
1488 | if (sc && |
1489 | (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)) { |
1490 | err = cxgbi_ddp_reserve(cconn->cep->csk, &tag, sw_tag, |
1491 | scsi_in(sc)->length, |
1492 | scsi_in(sc)->table.sgl, |
1493 | scsi_in(sc)->table.nents, |
1494 | GFP_ATOMIC); |
1495 | if (err < 0) |
1496 | log_debug(1 << CXGBI_DBG_DDP, |
1497 | "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n", |
1498 | cconn->cep->csk, task, scsi_in(sc)->length, |
1499 | scsi_in(sc)->table.nents); |
1500 | } |
1501 | |
1502 | if (err < 0) |
1503 | tag = cxgbi_set_non_ddp_tag(tformat, sw_tag); |
1504 | /* the itt need to sent in big-endian order */ |
1505 | *hdr_itt = (__force itt_t)htonl(tag); |
1506 | |
1507 | log_debug(1 << CXGBI_DBG_DDP, |
1508 | "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n", |
1509 | chba->cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt); |
1510 | return 0; |
1511 | } |
1512 | |
1513 | void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age) |
1514 | { |
1515 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1516 | struct cxgbi_conn *cconn = tcp_conn->dd_data; |
1517 | struct cxgbi_device *cdev = cconn->chba->cdev; |
1518 | u32 tag = ntohl((__force u32) itt); |
1519 | u32 sw_bits; |
1520 | |
1521 | sw_bits = cxgbi_tag_nonrsvd_bits(&cdev->tag_format, tag); |
1522 | if (idx) |
1523 | *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1); |
1524 | if (age) |
1525 | *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK; |
1526 | |
1527 | log_debug(1 << CXGBI_DBG_DDP, |
1528 | "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n", |
1529 | cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF, |
1530 | age ? *age : 0xFF); |
1531 | } |
1532 | EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt); |
1533 | |
1534 | void cxgbi_conn_tx_open(struct cxgbi_sock *csk) |
1535 | { |
1536 | struct iscsi_conn *conn = csk->user_data; |
1537 | |
1538 | if (conn) { |
1539 | log_debug(1 << CXGBI_DBG_SOCK, |
1540 | "csk 0x%p, cid %d.\n", csk, conn->id); |
1541 | iscsi_conn_queue_work(conn); |
1542 | } |
1543 | } |
1544 | EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open); |
1545 | |
1546 | /* |
1547 | * pdu receive, interact with libiscsi_tcp |
1548 | */ |
1549 | static inline int read_pdu_skb(struct iscsi_conn *conn, |
1550 | struct sk_buff *skb, |
1551 | unsigned int offset, |
1552 | int offloaded) |
1553 | { |
1554 | int status = 0; |
1555 | int bytes_read; |
1556 | |
1557 | bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status); |
1558 | switch (status) { |
1559 | case ISCSI_TCP_CONN_ERR: |
1560 | pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n", |
1561 | skb, offset, offloaded); |
1562 | return -EIO; |
1563 | case ISCSI_TCP_SUSPENDED: |
1564 | log_debug(1 << CXGBI_DBG_PDU_RX, |
1565 | "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n", |
1566 | skb, offset, offloaded, bytes_read); |
1567 | /* no transfer - just have caller flush queue */ |
1568 | return bytes_read; |
1569 | case ISCSI_TCP_SKB_DONE: |
1570 | pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n", |
1571 | skb, offset, offloaded); |
1572 | /* |
1573 | * pdus should always fit in the skb and we should get |
1574 | * segment done notifcation. |
1575 | */ |
1576 | iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb."); |
1577 | return -EFAULT; |
1578 | case ISCSI_TCP_SEGMENT_DONE: |
1579 | log_debug(1 << CXGBI_DBG_PDU_RX, |
1580 | "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n", |
1581 | skb, offset, offloaded, bytes_read); |
1582 | return bytes_read; |
1583 | default: |
1584 | pr_info("skb 0x%p, off %u, %d, invalid status %d.\n", |
1585 | skb, offset, offloaded, status); |
1586 | return -EINVAL; |
1587 | } |
1588 | } |
1589 | |
1590 | static int skb_read_pdu_bhs(struct iscsi_conn *conn, struct sk_buff *skb) |
1591 | { |
1592 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1593 | |
1594 | log_debug(1 << CXGBI_DBG_PDU_RX, |
1595 | "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n", |
1596 | conn, skb, skb->len, cxgbi_skcb_flags(skb)); |
1597 | |
1598 | if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) { |
1599 | pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb); |
1600 | iscsi_conn_failure(conn, ISCSI_ERR_PROTO); |
1601 | return -EIO; |
1602 | } |
1603 | |
1604 | if (conn->hdrdgst_en && |
1605 | cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) { |
1606 | pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb); |
1607 | iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST); |
1608 | return -EIO; |
1609 | } |
1610 | |
1611 | return read_pdu_skb(conn, skb, 0, 0); |
1612 | } |
1613 | |
1614 | static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb, |
1615 | struct sk_buff *skb, unsigned int offset) |
1616 | { |
1617 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
1618 | bool offloaded = 0; |
1619 | int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK; |
1620 | |
1621 | log_debug(1 << CXGBI_DBG_PDU_RX, |
1622 | "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n", |
1623 | conn, skb, skb->len, cxgbi_skcb_flags(skb)); |
1624 | |
1625 | if (conn->datadgst_en && |
1626 | cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) { |
1627 | pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n", |
1628 | conn, lskb, cxgbi_skcb_flags(lskb)); |
1629 | iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST); |
1630 | return -EIO; |
1631 | } |
1632 | |
1633 | if (iscsi_tcp_recv_segment_is_hdr(tcp_conn)) |
1634 | return 0; |
1635 | |
1636 | /* coalesced, add header digest length */ |
1637 | if (lskb == skb && conn->hdrdgst_en) |
1638 | offset += ISCSI_DIGEST_SIZE; |
1639 | |
1640 | if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD)) |
1641 | offloaded = 1; |
1642 | |
1643 | if (opcode == ISCSI_OP_SCSI_DATA_IN) |
1644 | log_debug(1 << CXGBI_DBG_PDU_RX, |
1645 | "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n", |
1646 | skb, opcode, ntohl(tcp_conn->in.hdr->itt), |
1647 | tcp_conn->in.datalen, offloaded ? "is" : "not"); |
1648 | |
1649 | return read_pdu_skb(conn, skb, offset, offloaded); |
1650 | } |
1651 | |
1652 | static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied) |
1653 | { |
1654 | struct cxgbi_device *cdev = csk->cdev; |
1655 | int must_send; |
1656 | u32 credits; |
1657 | |
1658 | log_debug(1 << CXGBI_DBG_PDU_RX, |
1659 | "csk 0x%p,%u,0x%lu,%u, seq %u, wup %u, thre %u, %u.\n", |
1660 | csk, csk->state, csk->flags, csk->tid, csk->copied_seq, |
1661 | csk->rcv_wup, cdev->rx_credit_thres, |
1662 | cdev->rcv_win); |
1663 | |
1664 | if (csk->state != CTP_ESTABLISHED) |
1665 | return; |
1666 | |
1667 | credits = csk->copied_seq - csk->rcv_wup; |
1668 | if (unlikely(!credits)) |
1669 | return; |
1670 | if (unlikely(cdev->rx_credit_thres == 0)) |
1671 | return; |
1672 | |
1673 | must_send = credits + 16384 >= cdev->rcv_win; |
1674 | if (must_send || credits >= cdev->rx_credit_thres) |
1675 | csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits); |
1676 | } |
1677 | |
1678 | void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk) |
1679 | { |
1680 | struct cxgbi_device *cdev = csk->cdev; |
1681 | struct iscsi_conn *conn = csk->user_data; |
1682 | struct sk_buff *skb; |
1683 | unsigned int read = 0; |
1684 | int err = 0; |
1685 | |
1686 | log_debug(1 << CXGBI_DBG_PDU_RX, |
1687 | "csk 0x%p, conn 0x%p.\n", csk, conn); |
1688 | |
1689 | if (unlikely(!conn || conn->suspend_rx)) { |
1690 | log_debug(1 << CXGBI_DBG_PDU_RX, |
1691 | "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n", |
1692 | csk, conn, conn ? conn->id : 0xFF, |
1693 | conn ? conn->suspend_rx : 0xFF); |
9ba682f0 |
1694 | return; |
1695 | } |
1696 | |
1697 | while (!err) { |
9ba682f0 |
1698 | skb = skb_peek(&csk->receive_queue); |
1699 | if (!skb || |
1700 | !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) { |
1701 | if (skb) |
1702 | log_debug(1 << CXGBI_DBG_PDU_RX, |
1703 | "skb 0x%p, NOT ready 0x%lx.\n", |
1704 | skb, cxgbi_skcb_flags(skb)); |
9ba682f0 |
1705 | break; |
1706 | } |
1707 | __skb_unlink(skb, &csk->receive_queue); |
9ba682f0 |
1708 | |
1709 | read += cxgbi_skcb_rx_pdulen(skb); |
1710 | log_debug(1 << CXGBI_DBG_PDU_RX, |
1711 | "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n", |
1712 | csk, skb, skb->len, cxgbi_skcb_flags(skb), |
1713 | cxgbi_skcb_rx_pdulen(skb)); |
1714 | |
1715 | if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) { |
1716 | err = skb_read_pdu_bhs(conn, skb); |
e3d2ad8c |
1717 | if (err < 0) { |
1718 | pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, " |
1719 | "f 0x%lx, plen %u.\n", |
1720 | csk, skb, skb->len, |
1721 | cxgbi_skcb_flags(skb), |
1722 | cxgbi_skcb_rx_pdulen(skb)); |
1723 | goto skb_done; |
1724 | } |
9ba682f0 |
1725 | err = skb_read_pdu_data(conn, skb, skb, |
1726 | err + cdev->skb_rx_extra); |
e3d2ad8c |
1727 | if (err < 0) |
1728 | pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, " |
1729 | "f 0x%lx, plen %u.\n", |
1730 | csk, skb, skb->len, |
1731 | cxgbi_skcb_flags(skb), |
1732 | cxgbi_skcb_rx_pdulen(skb)); |
9ba682f0 |
1733 | } else { |
1734 | err = skb_read_pdu_bhs(conn, skb); |
e3d2ad8c |
1735 | if (err < 0) { |
1736 | pr_err("bhs, csk 0x%p, skb 0x%p,%u, " |
1737 | "f 0x%lx, plen %u.\n", |
1738 | csk, skb, skb->len, |
1739 | cxgbi_skcb_flags(skb), |
1740 | cxgbi_skcb_rx_pdulen(skb)); |
1741 | goto skb_done; |
1742 | } |
1743 | |
9ba682f0 |
1744 | if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) { |
1745 | struct sk_buff *dskb; |
1746 | |
9ba682f0 |
1747 | dskb = skb_peek(&csk->receive_queue); |
1748 | if (!dskb) { |
e3d2ad8c |
1749 | pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx," |
1750 | " plen %u, NO data.\n", |
1751 | csk, skb, skb->len, |
1752 | cxgbi_skcb_flags(skb), |
1753 | cxgbi_skcb_rx_pdulen(skb)); |
1754 | err = -EIO; |
1755 | goto skb_done; |
9ba682f0 |
1756 | } |
1757 | __skb_unlink(dskb, &csk->receive_queue); |
9ba682f0 |
1758 | |
1759 | err = skb_read_pdu_data(conn, skb, dskb, 0); |
e3d2ad8c |
1760 | if (err < 0) |
1761 | pr_err("data, csk 0x%p, skb 0x%p,%u, " |
1762 | "f 0x%lx, plen %u, dskb 0x%p," |
1763 | "%u.\n", |
1764 | csk, skb, skb->len, |
1765 | cxgbi_skcb_flags(skb), |
1766 | cxgbi_skcb_rx_pdulen(skb), |
1767 | dskb, dskb->len); |
9ba682f0 |
1768 | __kfree_skb(dskb); |
1769 | } else |
1770 | err = skb_read_pdu_data(conn, skb, skb, 0); |
1771 | } |
e3d2ad8c |
1772 | skb_done: |
1773 | __kfree_skb(skb); |
1774 | |
9ba682f0 |
1775 | if (err < 0) |
1776 | break; |
9ba682f0 |
1777 | } |
1778 | |
1779 | log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read); |
1780 | if (read) { |
1781 | csk->copied_seq += read; |
1782 | csk_return_rx_credits(csk, read); |
1783 | conn->rxdata_octets += read; |
1784 | } |
1785 | |
1786 | if (err < 0) { |
e3d2ad8c |
1787 | pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n", |
1788 | csk, conn, err, read); |
9ba682f0 |
1789 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
1790 | } |
1791 | } |
1792 | EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready); |
1793 | |
1794 | static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt, |
1795 | unsigned int offset, unsigned int *off, |
1796 | struct scatterlist **sgp) |
1797 | { |
1798 | int i; |
1799 | struct scatterlist *sg; |
1800 | |
1801 | for_each_sg(sgl, sg, sgcnt, i) { |
1802 | if (offset < sg->length) { |
1803 | *off = offset; |
1804 | *sgp = sg; |
1805 | return 0; |
1806 | } |
1807 | offset -= sg->length; |
1808 | } |
1809 | return -EFAULT; |
1810 | } |
1811 | |
1812 | static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset, |
1813 | unsigned int dlen, skb_frag_t *frags, |
1814 | int frag_max) |
1815 | { |
1816 | unsigned int datalen = dlen; |
1817 | unsigned int sglen = sg->length - sgoffset; |
1818 | struct page *page = sg_page(sg); |
1819 | int i; |
1820 | |
1821 | i = 0; |
1822 | do { |
1823 | unsigned int copy; |
1824 | |
1825 | if (!sglen) { |
1826 | sg = sg_next(sg); |
1827 | if (!sg) { |
1828 | pr_warn("sg %d NULL, len %u/%u.\n", |
1829 | i, datalen, dlen); |
1830 | return -EINVAL; |
1831 | } |
1832 | sgoffset = 0; |
1833 | sglen = sg->length; |
1834 | page = sg_page(sg); |
1835 | |
1836 | } |
1837 | copy = min(datalen, sglen); |
1838 | if (i && page == frags[i - 1].page && |
1839 | sgoffset + sg->offset == |
1840 | frags[i - 1].page_offset + frags[i - 1].size) { |
1841 | frags[i - 1].size += copy; |
1842 | } else { |
1843 | if (i >= frag_max) { |
1844 | pr_warn("too many pages %u, dlen %u.\n", |
1845 | frag_max, dlen); |
1846 | return -EINVAL; |
1847 | } |
1848 | |
1849 | frags[i].page = page; |
1850 | frags[i].page_offset = sg->offset + sgoffset; |
1851 | frags[i].size = copy; |
1852 | i++; |
1853 | } |
1854 | datalen -= copy; |
1855 | sgoffset += copy; |
1856 | sglen -= copy; |
1857 | } while (datalen); |
1858 | |
1859 | return i; |
1860 | } |
1861 | |
1862 | int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode) |
1863 | { |
1864 | struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data; |
1865 | struct cxgbi_conn *cconn = tcp_conn->dd_data; |
1866 | struct cxgbi_device *cdev = cconn->chba->cdev; |
1867 | struct iscsi_conn *conn = task->conn; |
1868 | struct iscsi_tcp_task *tcp_task = task->dd_data; |
e3d2ad8c |
1869 | struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task); |
9ba682f0 |
1870 | struct scsi_cmnd *sc = task->sc; |
1871 | int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX; |
1872 | |
1873 | tcp_task->dd_data = tdata; |
1874 | task->hdr = NULL; |
1875 | |
1876 | if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) && |
1877 | (opcode == ISCSI_OP_SCSI_DATA_OUT || |
1878 | (opcode == ISCSI_OP_SCSI_CMD && |
1879 | (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE)))) |
1880 | /* data could goes into skb head */ |
1881 | headroom += min_t(unsigned int, |
1882 | SKB_MAX_HEAD(cdev->skb_tx_rsvd), |
1883 | conn->max_xmit_dlength); |
1884 | |
1885 | tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC); |
1886 | if (!tdata->skb) { |
1887 | pr_warn("alloc skb %u+%u, opcode 0x%x failed.\n", |
1888 | cdev->skb_tx_rsvd, headroom, opcode); |
1889 | return -ENOMEM; |
1890 | } |
1891 | |
1892 | skb_reserve(tdata->skb, cdev->skb_tx_rsvd); |
1893 | task->hdr = (struct iscsi_hdr *)tdata->skb->data; |
1894 | task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */ |
1895 | |
1896 | /* data_out uses scsi_cmd's itt */ |
1897 | if (opcode != ISCSI_OP_SCSI_DATA_OUT) |
1898 | task_reserve_itt(task, &task->hdr->itt); |
1899 | |
1900 | log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX, |
1901 | "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n", |
1902 | task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom, |
1903 | conn->max_xmit_dlength, ntohl(task->hdr->itt)); |
1904 | |
1905 | return 0; |
1906 | } |
1907 | EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu); |
1908 | |
1909 | static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc) |
1910 | { |
1911 | u8 submode = 0; |
1912 | |
1913 | if (hcrc) |
1914 | submode |= 1; |
1915 | if (dcrc) |
1916 | submode |= 2; |
1917 | cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode; |
1918 | } |
1919 | |
1920 | int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset, |
1921 | unsigned int count) |
1922 | { |
1923 | struct iscsi_conn *conn = task->conn; |
e3d2ad8c |
1924 | struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task); |
9ba682f0 |
1925 | struct sk_buff *skb = tdata->skb; |
1926 | unsigned int datalen = count; |
1927 | int i, padlen = iscsi_padding(count); |
1928 | struct page *pg; |
1929 | |
1930 | log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX, |
1931 | "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n", |
1932 | task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK, |
1933 | ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count); |
1934 | |
1935 | skb_put(skb, task->hdr_len); |
1936 | tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0); |
1937 | if (!count) |
1938 | return 0; |
1939 | |
1940 | if (task->sc) { |
1941 | struct scsi_data_buffer *sdb = scsi_out(task->sc); |
1942 | struct scatterlist *sg = NULL; |
1943 | int err; |
1944 | |
1945 | tdata->offset = offset; |
1946 | tdata->count = count; |
1947 | err = sgl_seek_offset( |
1948 | sdb->table.sgl, sdb->table.nents, |
1949 | tdata->offset, &tdata->sgoffset, &sg); |
1950 | if (err < 0) { |
1951 | pr_warn("tpdu, sgl %u, bad offset %u/%u.\n", |
1952 | sdb->table.nents, tdata->offset, sdb->length); |
1953 | return err; |
1954 | } |
1955 | err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count, |
1956 | tdata->frags, MAX_PDU_FRAGS); |
1957 | if (err < 0) { |
1958 | pr_warn("tpdu, sgl %u, bad offset %u + %u.\n", |
1959 | sdb->table.nents, tdata->offset, tdata->count); |
1960 | return err; |
1961 | } |
1962 | tdata->nr_frags = err; |
1963 | |
1964 | if (tdata->nr_frags > MAX_SKB_FRAGS || |
1965 | (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) { |
1966 | char *dst = skb->data + task->hdr_len; |
1967 | skb_frag_t *frag = tdata->frags; |
1968 | |
1969 | /* data fits in the skb's headroom */ |
1970 | for (i = 0; i < tdata->nr_frags; i++, frag++) { |
1971 | char *src = kmap_atomic(frag->page, |
1972 | KM_SOFTIRQ0); |
1973 | |
1974 | memcpy(dst, src+frag->page_offset, frag->size); |
1975 | dst += frag->size; |
1976 | kunmap_atomic(src, KM_SOFTIRQ0); |
1977 | } |
1978 | if (padlen) { |
1979 | memset(dst, 0, padlen); |
1980 | padlen = 0; |
1981 | } |
1982 | skb_put(skb, count + padlen); |
1983 | } else { |
1984 | /* data fit into frag_list */ |
1985 | for (i = 0; i < tdata->nr_frags; i++) |
1986 | get_page(tdata->frags[i].page); |
1987 | |
1988 | memcpy(skb_shinfo(skb)->frags, tdata->frags, |
1989 | sizeof(skb_frag_t) * tdata->nr_frags); |
1990 | skb_shinfo(skb)->nr_frags = tdata->nr_frags; |
1991 | skb->len += count; |
1992 | skb->data_len += count; |
1993 | skb->truesize += count; |
1994 | } |
1995 | |
1996 | } else { |
1997 | pg = virt_to_page(task->data); |
1998 | |
1999 | get_page(pg); |
2000 | skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data), |
2001 | count); |
2002 | skb->len += count; |
2003 | skb->data_len += count; |
2004 | skb->truesize += count; |
2005 | } |
2006 | |
2007 | if (padlen) { |
2008 | i = skb_shinfo(skb)->nr_frags; |
2009 | skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, |
2010 | virt_to_page(padding), offset_in_page(padding), |
2011 | padlen); |
2012 | |
2013 | skb->data_len += padlen; |
2014 | skb->truesize += padlen; |
2015 | skb->len += padlen; |
2016 | } |
2017 | |
2018 | return 0; |
2019 | } |
2020 | EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu); |
2021 | |
2022 | int cxgbi_conn_xmit_pdu(struct iscsi_task *task) |
2023 | { |
2024 | struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data; |
2025 | struct cxgbi_conn *cconn = tcp_conn->dd_data; |
e3d2ad8c |
2026 | struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task); |
9ba682f0 |
2027 | struct sk_buff *skb = tdata->skb; |
2028 | unsigned int datalen; |
2029 | int err; |
2030 | |
2031 | if (!skb) { |
2032 | log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX, |
2033 | "task 0x%p, skb NULL.\n", task); |
2034 | return 0; |
2035 | } |
2036 | |
2037 | datalen = skb->data_len; |
2038 | tdata->skb = NULL; |
2039 | err = cxgbi_sock_send_pdus(cconn->cep->csk, skb); |
2040 | if (err > 0) { |
2041 | int pdulen = err; |
2042 | |
2043 | log_debug(1 << CXGBI_DBG_PDU_TX, |
2044 | "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n", |
2045 | task, task->sc, skb, skb->len, skb->data_len, err); |
2046 | |
2047 | if (task->conn->hdrdgst_en) |
2048 | pdulen += ISCSI_DIGEST_SIZE; |
2049 | |
2050 | if (datalen && task->conn->datadgst_en) |
2051 | pdulen += ISCSI_DIGEST_SIZE; |
2052 | |
2053 | task->conn->txdata_octets += pdulen; |
2054 | return 0; |
2055 | } |
2056 | |
2057 | if (err == -EAGAIN || err == -ENOBUFS) { |
2058 | log_debug(1 << CXGBI_DBG_PDU_TX, |
2059 | "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n", |
2060 | task, skb, skb->len, skb->data_len, err); |
2061 | /* reset skb to send when we are called again */ |
2062 | tdata->skb = skb; |
2063 | return err; |
2064 | } |
2065 | |
2066 | kfree_skb(skb); |
2067 | log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX, |
2068 | "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n", |
2069 | task->itt, skb, skb->len, skb->data_len, err); |
2070 | iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err); |
2071 | iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED); |
2072 | return err; |
2073 | } |
2074 | EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu); |
2075 | |
2076 | void cxgbi_cleanup_task(struct iscsi_task *task) |
2077 | { |
e3d2ad8c |
2078 | struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task); |
9ba682f0 |
2079 | |
2080 | log_debug(1 << CXGBI_DBG_ISCSI, |
2081 | "task 0x%p, skb 0x%p, itt 0x%x.\n", |
2082 | task, tdata->skb, task->hdr_itt); |
2083 | |
2084 | /* never reached the xmit task callout */ |
2085 | if (tdata->skb) |
2086 | __kfree_skb(tdata->skb); |
2087 | memset(tdata, 0, sizeof(*tdata)); |
2088 | |
2089 | task_release_itt(task, task->hdr_itt); |
2090 | iscsi_tcp_cleanup_task(task); |
2091 | } |
2092 | EXPORT_SYMBOL_GPL(cxgbi_cleanup_task); |
2093 | |
2094 | void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn, |
2095 | struct iscsi_stats *stats) |
2096 | { |
2097 | struct iscsi_conn *conn = cls_conn->dd_data; |
2098 | |
2099 | stats->txdata_octets = conn->txdata_octets; |
2100 | stats->rxdata_octets = conn->rxdata_octets; |
2101 | stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; |
2102 | stats->dataout_pdus = conn->dataout_pdus_cnt; |
2103 | stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; |
2104 | stats->datain_pdus = conn->datain_pdus_cnt; |
2105 | stats->r2t_pdus = conn->r2t_pdus_cnt; |
2106 | stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; |
2107 | stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; |
2108 | stats->digest_err = 0; |
2109 | stats->timeout_err = 0; |
2110 | stats->custom_length = 1; |
2111 | strcpy(stats->custom[0].desc, "eh_abort_cnt"); |
2112 | stats->custom[0].value = conn->eh_abort_cnt; |
2113 | } |
2114 | EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats); |
2115 | |
2116 | static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn) |
2117 | { |
2118 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
2119 | struct cxgbi_conn *cconn = tcp_conn->dd_data; |
2120 | struct cxgbi_device *cdev = cconn->chba->cdev; |
2121 | unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd); |
2122 | unsigned int max_def = 512 * MAX_SKB_FRAGS; |
2123 | unsigned int max = max(max_def, headroom); |
2124 | |
2125 | max = min(cconn->chba->cdev->tx_max_size, max); |
2126 | if (conn->max_xmit_dlength) |
2127 | conn->max_xmit_dlength = min(conn->max_xmit_dlength, max); |
2128 | else |
2129 | conn->max_xmit_dlength = max; |
2130 | cxgbi_align_pdu_size(conn->max_xmit_dlength); |
2131 | |
2132 | return 0; |
2133 | } |
2134 | |
2135 | static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn) |
2136 | { |
2137 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
2138 | struct cxgbi_conn *cconn = tcp_conn->dd_data; |
2139 | unsigned int max = cconn->chba->cdev->rx_max_size; |
2140 | |
2141 | cxgbi_align_pdu_size(max); |
2142 | |
2143 | if (conn->max_recv_dlength) { |
2144 | if (conn->max_recv_dlength > max) { |
2145 | pr_err("MaxRecvDataSegmentLength %u > %u.\n", |
2146 | conn->max_recv_dlength, max); |
2147 | return -EINVAL; |
2148 | } |
2149 | conn->max_recv_dlength = min(conn->max_recv_dlength, max); |
2150 | cxgbi_align_pdu_size(conn->max_recv_dlength); |
2151 | } else |
2152 | conn->max_recv_dlength = max; |
2153 | |
2154 | return 0; |
2155 | } |
2156 | |
2157 | int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn, |
2158 | enum iscsi_param param, char *buf, int buflen) |
2159 | { |
2160 | struct iscsi_conn *conn = cls_conn->dd_data; |
2161 | struct iscsi_session *session = conn->session; |
2162 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
2163 | struct cxgbi_conn *cconn = tcp_conn->dd_data; |
2164 | struct cxgbi_sock *csk = cconn->cep->csk; |
2165 | int value, err = 0; |
2166 | |
2167 | log_debug(1 << CXGBI_DBG_ISCSI, |
2168 | "cls_conn 0x%p, param %d, buf(%d) %s.\n", |
2169 | cls_conn, param, buflen, buf); |
2170 | |
2171 | switch (param) { |
2172 | case ISCSI_PARAM_HDRDGST_EN: |
2173 | err = iscsi_set_param(cls_conn, param, buf, buflen); |
2174 | if (!err && conn->hdrdgst_en) |
2175 | err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid, |
2176 | conn->hdrdgst_en, |
2177 | conn->datadgst_en, 0); |
2178 | break; |
2179 | case ISCSI_PARAM_DATADGST_EN: |
2180 | err = iscsi_set_param(cls_conn, param, buf, buflen); |
2181 | if (!err && conn->datadgst_en) |
2182 | err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid, |
2183 | conn->hdrdgst_en, |
2184 | conn->datadgst_en, 0); |
2185 | break; |
2186 | case ISCSI_PARAM_MAX_R2T: |
2187 | sscanf(buf, "%d", &value); |
2188 | if (value <= 0 || !is_power_of_2(value)) |
2189 | return -EINVAL; |
2190 | if (session->max_r2t == value) |
2191 | break; |
2192 | iscsi_tcp_r2tpool_free(session); |
2193 | err = iscsi_set_param(cls_conn, param, buf, buflen); |
2194 | if (!err && iscsi_tcp_r2tpool_alloc(session)) |
2195 | return -ENOMEM; |
2196 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
2197 | err = iscsi_set_param(cls_conn, param, buf, buflen); |
2198 | if (!err) |
2199 | err = cxgbi_conn_max_recv_dlength(conn); |
2200 | break; |
2201 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: |
2202 | err = iscsi_set_param(cls_conn, param, buf, buflen); |
2203 | if (!err) |
2204 | err = cxgbi_conn_max_xmit_dlength(conn); |
2205 | break; |
2206 | default: |
2207 | return iscsi_set_param(cls_conn, param, buf, buflen); |
2208 | } |
2209 | return err; |
2210 | } |
2211 | EXPORT_SYMBOL_GPL(cxgbi_set_conn_param); |
2212 | |
2213 | int cxgbi_get_conn_param(struct iscsi_cls_conn *cls_conn, |
2214 | enum iscsi_param param, char *buf) |
2215 | { |
2216 | struct iscsi_conn *iconn = cls_conn->dd_data; |
2217 | int len; |
2218 | |
2219 | log_debug(1 << CXGBI_DBG_ISCSI, |
2220 | "cls_conn 0x%p, param %d.\n", cls_conn, param); |
2221 | |
2222 | switch (param) { |
2223 | case ISCSI_PARAM_CONN_PORT: |
2224 | spin_lock_bh(&iconn->session->lock); |
2225 | len = sprintf(buf, "%hu\n", iconn->portal_port); |
2226 | spin_unlock_bh(&iconn->session->lock); |
2227 | break; |
2228 | case ISCSI_PARAM_CONN_ADDRESS: |
2229 | spin_lock_bh(&iconn->session->lock); |
2230 | len = sprintf(buf, "%s\n", iconn->portal_address); |
2231 | spin_unlock_bh(&iconn->session->lock); |
2232 | break; |
2233 | default: |
2234 | return iscsi_conn_get_param(cls_conn, param, buf); |
2235 | } |
2236 | return len; |
2237 | } |
2238 | EXPORT_SYMBOL_GPL(cxgbi_get_conn_param); |
2239 | |
2240 | struct iscsi_cls_conn * |
2241 | cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid) |
2242 | { |
2243 | struct iscsi_cls_conn *cls_conn; |
2244 | struct iscsi_conn *conn; |
2245 | struct iscsi_tcp_conn *tcp_conn; |
2246 | struct cxgbi_conn *cconn; |
2247 | |
2248 | cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid); |
2249 | if (!cls_conn) |
2250 | return NULL; |
2251 | |
2252 | conn = cls_conn->dd_data; |
2253 | tcp_conn = conn->dd_data; |
2254 | cconn = tcp_conn->dd_data; |
2255 | cconn->iconn = conn; |
2256 | |
2257 | log_debug(1 << CXGBI_DBG_ISCSI, |
2258 | "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n", |
2259 | cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn); |
2260 | |
2261 | return cls_conn; |
2262 | } |
2263 | EXPORT_SYMBOL_GPL(cxgbi_create_conn); |
2264 | |
2265 | int cxgbi_bind_conn(struct iscsi_cls_session *cls_session, |
2266 | struct iscsi_cls_conn *cls_conn, |
2267 | u64 transport_eph, int is_leading) |
2268 | { |
2269 | struct iscsi_conn *conn = cls_conn->dd_data; |
2270 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
2271 | struct cxgbi_conn *cconn = tcp_conn->dd_data; |
2272 | struct iscsi_endpoint *ep; |
2273 | struct cxgbi_endpoint *cep; |
2274 | struct cxgbi_sock *csk; |
2275 | int err; |
2276 | |
2277 | ep = iscsi_lookup_endpoint(transport_eph); |
2278 | if (!ep) |
2279 | return -EINVAL; |
2280 | |
2281 | /* setup ddp pagesize */ |
2282 | cep = ep->dd_data; |
2283 | csk = cep->csk; |
2284 | err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid, page_idx, 0); |
2285 | if (err < 0) |
2286 | return err; |
2287 | |
2288 | err = iscsi_conn_bind(cls_session, cls_conn, is_leading); |
2289 | if (err) |
2290 | return -EINVAL; |
2291 | |
2292 | /* calculate the tag idx bits needed for this conn based on cmds_max */ |
2293 | cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1; |
2294 | |
e3d2ad8c |
2295 | write_lock_bh(&csk->callback_lock); |
9ba682f0 |
2296 | csk->user_data = conn; |
2297 | cconn->chba = cep->chba; |
2298 | cconn->cep = cep; |
2299 | cep->cconn = cconn; |
e3d2ad8c |
2300 | write_unlock_bh(&csk->callback_lock); |
9ba682f0 |
2301 | |
2302 | cxgbi_conn_max_xmit_dlength(conn); |
2303 | cxgbi_conn_max_recv_dlength(conn); |
2304 | |
2305 | spin_lock_bh(&conn->session->lock); |
2306 | sprintf(conn->portal_address, "%pI4", &csk->daddr.sin_addr.s_addr); |
2307 | conn->portal_port = ntohs(csk->daddr.sin_port); |
2308 | spin_unlock_bh(&conn->session->lock); |
2309 | |
2310 | log_debug(1 << CXGBI_DBG_ISCSI, |
2311 | "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n", |
2312 | cls_session, cls_conn, ep, cconn, csk); |
2313 | /* init recv engine */ |
2314 | iscsi_tcp_hdr_recv_prep(tcp_conn); |
2315 | |
2316 | return 0; |
2317 | } |
2318 | EXPORT_SYMBOL_GPL(cxgbi_bind_conn); |
2319 | |
2320 | struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep, |
2321 | u16 cmds_max, u16 qdepth, |
2322 | u32 initial_cmdsn) |
2323 | { |
2324 | struct cxgbi_endpoint *cep; |
2325 | struct cxgbi_hba *chba; |
2326 | struct Scsi_Host *shost; |
2327 | struct iscsi_cls_session *cls_session; |
2328 | struct iscsi_session *session; |
2329 | |
2330 | if (!ep) { |
2331 | pr_err("missing endpoint.\n"); |
2332 | return NULL; |
2333 | } |
2334 | |
2335 | cep = ep->dd_data; |
2336 | chba = cep->chba; |
2337 | shost = chba->shost; |
2338 | |
2339 | BUG_ON(chba != iscsi_host_priv(shost)); |
2340 | |
2341 | cls_session = iscsi_session_setup(chba->cdev->itp, shost, |
2342 | cmds_max, 0, |
2343 | sizeof(struct iscsi_tcp_task) + |
2344 | sizeof(struct cxgbi_task_data), |
2345 | initial_cmdsn, ISCSI_MAX_TARGET); |
2346 | if (!cls_session) |
2347 | return NULL; |
2348 | |
2349 | session = cls_session->dd_data; |
2350 | if (iscsi_tcp_r2tpool_alloc(session)) |
2351 | goto remove_session; |
2352 | |
2353 | log_debug(1 << CXGBI_DBG_ISCSI, |
2354 | "ep 0x%p, cls sess 0x%p.\n", ep, cls_session); |
2355 | return cls_session; |
2356 | |
2357 | remove_session: |
2358 | iscsi_session_teardown(cls_session); |
2359 | return NULL; |
2360 | } |
2361 | EXPORT_SYMBOL_GPL(cxgbi_create_session); |
2362 | |
2363 | void cxgbi_destroy_session(struct iscsi_cls_session *cls_session) |
2364 | { |
2365 | log_debug(1 << CXGBI_DBG_ISCSI, |
2366 | "cls sess 0x%p.\n", cls_session); |
2367 | |
2368 | iscsi_tcp_r2tpool_free(cls_session->dd_data); |
2369 | iscsi_session_teardown(cls_session); |
2370 | } |
2371 | EXPORT_SYMBOL_GPL(cxgbi_destroy_session); |
2372 | |
2373 | int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param, |
2374 | char *buf, int buflen) |
2375 | { |
2376 | struct cxgbi_hba *chba = iscsi_host_priv(shost); |
2377 | |
2378 | if (!chba->ndev) { |
2379 | shost_printk(KERN_ERR, shost, "Could not get host param. " |
2380 | "netdev for host not set.\n"); |
2381 | return -ENODEV; |
2382 | } |
2383 | |
2384 | log_debug(1 << CXGBI_DBG_ISCSI, |
2385 | "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n", |
2386 | shost, chba, chba->ndev->name, param, buflen, buf); |
2387 | |
2388 | switch (param) { |
2389 | case ISCSI_HOST_PARAM_IPADDRESS: |
2390 | { |
2391 | __be32 addr = in_aton(buf); |
2392 | log_debug(1 << CXGBI_DBG_ISCSI, |
2393 | "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr); |
2394 | cxgbi_set_iscsi_ipv4(chba, addr); |
2395 | return 0; |
2396 | } |
2397 | case ISCSI_HOST_PARAM_HWADDRESS: |
2398 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
2399 | return 0; |
2400 | default: |
2401 | return iscsi_host_set_param(shost, param, buf, buflen); |
2402 | } |
2403 | } |
2404 | EXPORT_SYMBOL_GPL(cxgbi_set_host_param); |
2405 | |
2406 | int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param, |
2407 | char *buf) |
2408 | { |
2409 | struct cxgbi_hba *chba = iscsi_host_priv(shost); |
2410 | int len = 0; |
2411 | |
2412 | if (!chba->ndev) { |
2413 | shost_printk(KERN_ERR, shost, "Could not get host param. " |
2414 | "netdev for host not set.\n"); |
2415 | return -ENODEV; |
2416 | } |
2417 | |
2418 | log_debug(1 << CXGBI_DBG_ISCSI, |
2419 | "shost 0x%p, hba 0x%p,%s, param %d.\n", |
2420 | shost, chba, chba->ndev->name, param); |
2421 | |
2422 | switch (param) { |
2423 | case ISCSI_HOST_PARAM_HWADDRESS: |
2424 | len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6); |
2425 | break; |
2426 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
2427 | len = sprintf(buf, "%s\n", chba->ndev->name); |
2428 | break; |
2429 | case ISCSI_HOST_PARAM_IPADDRESS: |
2430 | { |
2431 | __be32 addr; |
2432 | |
2433 | addr = cxgbi_get_iscsi_ipv4(chba); |
2434 | len = sprintf(buf, "%pI4", &addr); |
2435 | log_debug(1 << CXGBI_DBG_ISCSI, |
2436 | "hba %s, ipv4 %pI4.\n", chba->ndev->name, &addr); |
2437 | break; |
2438 | } |
2439 | default: |
2440 | return iscsi_host_get_param(shost, param, buf); |
2441 | } |
2442 | |
2443 | return len; |
2444 | } |
2445 | EXPORT_SYMBOL_GPL(cxgbi_get_host_param); |
2446 | |
2447 | struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost, |
2448 | struct sockaddr *dst_addr, |
2449 | int non_blocking) |
2450 | { |
2451 | struct iscsi_endpoint *ep; |
2452 | struct cxgbi_endpoint *cep; |
2453 | struct cxgbi_hba *hba = NULL; |
2454 | struct cxgbi_sock *csk; |
2455 | int err = -EINVAL; |
2456 | |
2457 | log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK, |
2458 | "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n", |
2459 | shost, non_blocking, dst_addr); |
2460 | |
2461 | if (shost) { |
2462 | hba = iscsi_host_priv(shost); |
2463 | if (!hba) { |
2464 | pr_info("shost 0x%p, priv NULL.\n", shost); |
2465 | goto err_out; |
2466 | } |
2467 | } |
2468 | |
2469 | csk = cxgbi_check_route(dst_addr); |
2470 | if (IS_ERR(csk)) |
2471 | return (struct iscsi_endpoint *)csk; |
2472 | cxgbi_sock_get(csk); |
2473 | |
2474 | if (!hba) |
2475 | hba = csk->cdev->hbas[csk->port_id]; |
2476 | else if (hba != csk->cdev->hbas[csk->port_id]) { |
2477 | pr_info("Could not connect through requested host %u" |
2478 | "hba 0x%p != 0x%p (%u).\n", |
2479 | shost->host_no, hba, |
2480 | csk->cdev->hbas[csk->port_id], csk->port_id); |
2481 | err = -ENOSPC; |
2482 | goto release_conn; |
2483 | } |
2484 | |
2485 | err = sock_get_port(csk); |
2486 | if (err) |
2487 | goto release_conn; |
2488 | |
2489 | cxgbi_sock_set_state(csk, CTP_CONNECTING); |
2490 | err = csk->cdev->csk_init_act_open(csk); |
2491 | if (err) |
2492 | goto release_conn; |
2493 | |
2494 | if (cxgbi_sock_is_closing(csk)) { |
2495 | err = -ENOSPC; |
2496 | pr_info("csk 0x%p is closing.\n", csk); |
2497 | goto release_conn; |
2498 | } |
2499 | |
2500 | ep = iscsi_create_endpoint(sizeof(*cep)); |
2501 | if (!ep) { |
2502 | err = -ENOMEM; |
2503 | pr_info("iscsi alloc ep, OOM.\n"); |
2504 | goto release_conn; |
2505 | } |
2506 | |
2507 | cep = ep->dd_data; |
2508 | cep->csk = csk; |
2509 | cep->chba = hba; |
2510 | |
2511 | log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK, |
2512 | "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n", |
2513 | ep, cep, csk, hba, hba->ndev->name); |
2514 | return ep; |
2515 | |
2516 | release_conn: |
2517 | cxgbi_sock_put(csk); |
2518 | cxgbi_sock_closed(csk); |
2519 | err_out: |
2520 | return ERR_PTR(err); |
2521 | } |
2522 | EXPORT_SYMBOL_GPL(cxgbi_ep_connect); |
2523 | |
2524 | int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms) |
2525 | { |
2526 | struct cxgbi_endpoint *cep = ep->dd_data; |
2527 | struct cxgbi_sock *csk = cep->csk; |
2528 | |
2529 | if (!cxgbi_sock_is_established(csk)) |
2530 | return 0; |
2531 | return 1; |
2532 | } |
2533 | EXPORT_SYMBOL_GPL(cxgbi_ep_poll); |
2534 | |
2535 | void cxgbi_ep_disconnect(struct iscsi_endpoint *ep) |
2536 | { |
2537 | struct cxgbi_endpoint *cep = ep->dd_data; |
2538 | struct cxgbi_conn *cconn = cep->cconn; |
2539 | struct cxgbi_sock *csk = cep->csk; |
2540 | |
2541 | log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK, |
2542 | "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n", |
2543 | ep, cep, cconn, csk, csk->state, csk->flags); |
2544 | |
2545 | if (cconn && cconn->iconn) { |
2546 | iscsi_suspend_tx(cconn->iconn); |
2547 | write_lock_bh(&csk->callback_lock); |
2548 | cep->csk->user_data = NULL; |
2549 | cconn->cep = NULL; |
2550 | write_unlock_bh(&csk->callback_lock); |
2551 | } |
2552 | iscsi_destroy_endpoint(ep); |
2553 | |
2554 | if (likely(csk->state >= CTP_ESTABLISHED)) |
2555 | need_active_close(csk); |
2556 | else |
2557 | cxgbi_sock_closed(csk); |
2558 | |
2559 | cxgbi_sock_put(csk); |
2560 | } |
2561 | EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect); |
2562 | |
2563 | int cxgbi_iscsi_init(struct iscsi_transport *itp, |
2564 | struct scsi_transport_template **stt) |
2565 | { |
2566 | *stt = iscsi_register_transport(itp); |
2567 | if (*stt == NULL) { |
2568 | pr_err("unable to register %s transport 0x%p.\n", |
2569 | itp->name, itp); |
2570 | return -ENODEV; |
2571 | } |
2572 | log_debug(1 << CXGBI_DBG_ISCSI, |
2573 | "%s, registered iscsi transport 0x%p.\n", |
2574 | itp->name, stt); |
2575 | return 0; |
2576 | } |
2577 | EXPORT_SYMBOL_GPL(cxgbi_iscsi_init); |
2578 | |
2579 | void cxgbi_iscsi_cleanup(struct iscsi_transport *itp, |
2580 | struct scsi_transport_template **stt) |
2581 | { |
2582 | if (*stt) { |
2583 | log_debug(1 << CXGBI_DBG_ISCSI, |
2584 | "de-register transport 0x%p, %s, stt 0x%p.\n", |
2585 | itp, itp->name, *stt); |
2586 | *stt = NULL; |
2587 | iscsi_unregister_transport(itp); |
2588 | } |
2589 | } |
2590 | EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup); |
2591 | |
2592 | static int __init libcxgbi_init_module(void) |
2593 | { |
2594 | sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1; |
2595 | sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1; |
2596 | |
2597 | pr_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n", |
2598 | ISCSI_ITT_MASK, sw_tag_idx_bits, |
2599 | ISCSI_AGE_MASK, sw_tag_age_bits); |
2600 | |
2601 | ddp_setup_host_page_size(); |
2602 | return 0; |
2603 | } |
2604 | |
2605 | static void __exit libcxgbi_exit_module(void) |
2606 | { |
2607 | cxgbi_device_unregister_all(0xFF); |
2608 | return; |
2609 | } |
2610 | |
2611 | module_init(libcxgbi_init_module); |
2612 | module_exit(libcxgbi_exit_module); |