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9#define DRV_NAME "cxgbit"
10#define DRV_VERSION "1.0.0-ko"
11#define pr_fmt(fmt) DRV_NAME ": " fmt
12
13#include "cxgbit.h"
14
15#ifdef CONFIG_CHELSIO_T4_DCB
16#include <net/dcbevent.h>
17#include "cxgb4_dcb.h"
18#endif
19
20LIST_HEAD(cdev_list_head);
21
22DEFINE_MUTEX(cdev_list_lock);
23
24void _cxgbit_free_cdev(struct kref *kref)
25{
26 struct cxgbit_device *cdev;
27
28 cdev = container_of(kref, struct cxgbit_device, kref);
29 kfree(cdev);
30}
31
32static void cxgbit_set_mdsl(struct cxgbit_device *cdev)
33{
34 struct cxgb4_lld_info *lldi = &cdev->lldi;
35 u32 mdsl;
36
37#define ULP2_MAX_PKT_LEN 16224
38#define ISCSI_PDU_NONPAYLOAD_LEN 312
39 mdsl = min_t(u32, lldi->iscsi_iolen - ISCSI_PDU_NONPAYLOAD_LEN,
40 ULP2_MAX_PKT_LEN - ISCSI_PDU_NONPAYLOAD_LEN);
41 mdsl = min_t(u32, mdsl, 8192);
42 mdsl = min_t(u32, mdsl, (MAX_SKB_FRAGS - 1) * PAGE_SIZE);
43
44 cdev->mdsl = mdsl;
45}
46
47static void *cxgbit_uld_add(const struct cxgb4_lld_info *lldi)
48{
49 struct cxgbit_device *cdev;
50
51 if (is_t4(lldi->adapter_type))
52 return ERR_PTR(-ENODEV);
53
54 cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
55 if (!cdev)
56 return ERR_PTR(-ENOMEM);
57
58 kref_init(&cdev->kref);
59
60 cdev->lldi = *lldi;
61
62 cxgbit_set_mdsl(cdev);
63
64 if (cxgbit_ddp_init(cdev) < 0) {
65 kfree(cdev);
66 return ERR_PTR(-EINVAL);
67 }
68
69 if (!test_bit(CDEV_DDP_ENABLE, &cdev->flags))
70 pr_info("cdev %s ddp init failed\n",
71 pci_name(lldi->pdev));
72
73 if (lldi->fw_vers >= 0x10d2b00)
74 set_bit(CDEV_ISO_ENABLE, &cdev->flags);
75
76 spin_lock_init(&cdev->cskq.lock);
77 INIT_LIST_HEAD(&cdev->cskq.list);
78
79 mutex_lock(&cdev_list_lock);
80 list_add_tail(&cdev->list, &cdev_list_head);
81 mutex_unlock(&cdev_list_lock);
82
83 pr_info("cdev %s added for iSCSI target transport\n",
84 pci_name(lldi->pdev));
85
86 return cdev;
87}
88
89static void cxgbit_close_conn(struct cxgbit_device *cdev)
90{
91 struct cxgbit_sock *csk;
92 struct sk_buff *skb;
93 bool wakeup_thread = false;
94
95 spin_lock_bh(&cdev->cskq.lock);
96 list_for_each_entry(csk, &cdev->cskq.list, list) {
97 skb = alloc_skb(0, GFP_ATOMIC);
98 if (!skb)
99 continue;
100
101 spin_lock_bh(&csk->rxq.lock);
102 __skb_queue_tail(&csk->rxq, skb);
103 if (skb_queue_len(&csk->rxq) == 1)
104 wakeup_thread = true;
105 spin_unlock_bh(&csk->rxq.lock);
106
107 if (wakeup_thread) {
108 wake_up(&csk->waitq);
109 wakeup_thread = false;
110 }
111 }
112 spin_unlock_bh(&cdev->cskq.lock);
113}
114
115static void cxgbit_detach_cdev(struct cxgbit_device *cdev)
116{
117 bool free_cdev = false;
118
119 spin_lock_bh(&cdev->cskq.lock);
120 if (list_empty(&cdev->cskq.list))
121 free_cdev = true;
122 spin_unlock_bh(&cdev->cskq.lock);
123
124 if (free_cdev) {
125 mutex_lock(&cdev_list_lock);
126 list_del(&cdev->list);
127 mutex_unlock(&cdev_list_lock);
128
129 cxgbit_put_cdev(cdev);
130 } else {
131 cxgbit_close_conn(cdev);
132 }
133}
134
135static int cxgbit_uld_state_change(void *handle, enum cxgb4_state state)
136{
137 struct cxgbit_device *cdev = handle;
138
139 switch (state) {
140 case CXGB4_STATE_UP:
141 set_bit(CDEV_STATE_UP, &cdev->flags);
142 pr_info("cdev %s state UP.\n", pci_name(cdev->lldi.pdev));
143 break;
144 case CXGB4_STATE_START_RECOVERY:
145 clear_bit(CDEV_STATE_UP, &cdev->flags);
146 cxgbit_close_conn(cdev);
147 pr_info("cdev %s state RECOVERY.\n", pci_name(cdev->lldi.pdev));
148 break;
149 case CXGB4_STATE_DOWN:
150 pr_info("cdev %s state DOWN.\n", pci_name(cdev->lldi.pdev));
151 break;
152 case CXGB4_STATE_DETACH:
153 clear_bit(CDEV_STATE_UP, &cdev->flags);
154 pr_info("cdev %s state DETACH.\n", pci_name(cdev->lldi.pdev));
155 cxgbit_detach_cdev(cdev);
156 break;
157 default:
158 pr_info("cdev %s unknown state %d.\n",
159 pci_name(cdev->lldi.pdev), state);
160 break;
161 }
162 return 0;
163}
164
165static void
166cxgbit_proc_ddp_status(unsigned int tid, struct cpl_rx_data_ddp *cpl,
167 struct cxgbit_lro_pdu_cb *pdu_cb)
168{
169 unsigned int status = ntohl(cpl->ddpvld);
170
171 pdu_cb->flags |= PDUCBF_RX_STATUS;
172 pdu_cb->ddigest = ntohl(cpl->ulp_crc);
173 pdu_cb->pdulen = ntohs(cpl->len);
174
175 if (status & (1 << CPL_RX_ISCSI_DDP_STATUS_HCRC_SHIFT)) {
176 pr_info("tid 0x%x, status 0x%x, hcrc bad.\n", tid, status);
177 pdu_cb->flags |= PDUCBF_RX_HCRC_ERR;
178 }
179
180 if (status & (1 << CPL_RX_ISCSI_DDP_STATUS_DCRC_SHIFT)) {
181 pr_info("tid 0x%x, status 0x%x, dcrc bad.\n", tid, status);
182 pdu_cb->flags |= PDUCBF_RX_DCRC_ERR;
183 }
184
185 if (status & (1 << CPL_RX_ISCSI_DDP_STATUS_PAD_SHIFT))
186 pr_info("tid 0x%x, status 0x%x, pad bad.\n", tid, status);
187
188 if ((status & (1 << CPL_RX_ISCSI_DDP_STATUS_DDP_SHIFT)) &&
189 (!(pdu_cb->flags & PDUCBF_RX_DATA))) {
190 pdu_cb->flags |= PDUCBF_RX_DATA_DDPD;
191 }
192}
193
194static void
195cxgbit_lro_add_packet_rsp(struct sk_buff *skb, u8 op, const __be64 *rsp)
196{
197 struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb);
198 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb,
199 lro_cb->pdu_idx);
200 struct cpl_rx_iscsi_ddp *cpl = (struct cpl_rx_iscsi_ddp *)(rsp + 1);
201
202 cxgbit_proc_ddp_status(lro_cb->csk->tid, cpl, pdu_cb);
203
204 if (pdu_cb->flags & PDUCBF_RX_HDR)
205 pdu_cb->complete = true;
206
207 lro_cb->complete = true;
208 lro_cb->pdu_totallen += pdu_cb->pdulen;
209 lro_cb->pdu_idx++;
210}
211
212static void
213cxgbit_copy_frags(struct sk_buff *skb, const struct pkt_gl *gl,
214 unsigned int offset)
215{
216 u8 skb_frag_idx = skb_shinfo(skb)->nr_frags;
217 u8 i;
218
219
220 __skb_fill_page_desc(skb, skb_frag_idx, gl->frags[0].page,
221 gl->frags[0].offset + offset,
222 gl->frags[0].size - offset);
223 for (i = 1; i < gl->nfrags; i++)
224 __skb_fill_page_desc(skb, skb_frag_idx + i,
225 gl->frags[i].page,
226 gl->frags[i].offset,
227 gl->frags[i].size);
228
229 skb_shinfo(skb)->nr_frags += gl->nfrags;
230
231
232 get_page(gl->frags[gl->nfrags - 1].page);
233}
234
235static void
236cxgbit_lro_add_packet_gl(struct sk_buff *skb, u8 op, const struct pkt_gl *gl)
237{
238 struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb);
239 struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb,
240 lro_cb->pdu_idx);
241 u32 len, offset;
242
243 if (op == CPL_ISCSI_HDR) {
244 struct cpl_iscsi_hdr *cpl = (struct cpl_iscsi_hdr *)gl->va;
245
246 offset = sizeof(struct cpl_iscsi_hdr);
247 pdu_cb->flags |= PDUCBF_RX_HDR;
248 pdu_cb->seq = ntohl(cpl->seq);
249 len = ntohs(cpl->len);
250 pdu_cb->hdr = gl->va + offset;
251 pdu_cb->hlen = len;
252 pdu_cb->hfrag_idx = skb_shinfo(skb)->nr_frags;
253
254 if (unlikely(gl->nfrags > 1))
255 cxgbit_skcb_flags(skb) = 0;
256
257 lro_cb->complete = false;
258 } else {
259 struct cpl_iscsi_data *cpl = (struct cpl_iscsi_data *)gl->va;
260
261 offset = sizeof(struct cpl_iscsi_data);
262 pdu_cb->flags |= PDUCBF_RX_DATA;
263 len = ntohs(cpl->len);
264 pdu_cb->dlen = len;
265 pdu_cb->doffset = lro_cb->offset;
266 pdu_cb->nr_dfrags = gl->nfrags;
267 pdu_cb->dfrag_idx = skb_shinfo(skb)->nr_frags;
268 }
269
270 cxgbit_copy_frags(skb, gl, offset);
271
272 pdu_cb->frags += gl->nfrags;
273 lro_cb->offset += len;
274 skb->len += len;
275 skb->data_len += len;
276 skb->truesize += len;
277}
278
279static struct sk_buff *
280cxgbit_lro_init_skb(struct cxgbit_sock *csk, u8 op, const struct pkt_gl *gl,
281 const __be64 *rsp, struct napi_struct *napi)
282{
283 struct sk_buff *skb;
284 struct cxgbit_lro_cb *lro_cb;
285
286 skb = napi_alloc_skb(napi, LRO_SKB_MAX_HEADROOM);
287
288 if (unlikely(!skb))
289 return NULL;
290
291 memset(skb->data, 0, LRO_SKB_MAX_HEADROOM);
292
293 cxgbit_skcb_flags(skb) |= SKCBF_RX_LRO;
294
295 lro_cb = cxgbit_skb_lro_cb(skb);
296
297 cxgbit_get_csk(csk);
298
299 lro_cb->csk = csk;
300
301 return skb;
302}
303
304static void cxgbit_queue_lro_skb(struct cxgbit_sock *csk, struct sk_buff *skb)
305{
306 bool wakeup_thread = false;
307
308 spin_lock(&csk->rxq.lock);
309 __skb_queue_tail(&csk->rxq, skb);
310 if (skb_queue_len(&csk->rxq) == 1)
311 wakeup_thread = true;
312 spin_unlock(&csk->rxq.lock);
313
314 if (wakeup_thread)
315 wake_up(&csk->waitq);
316}
317
318static void cxgbit_lro_flush(struct t4_lro_mgr *lro_mgr, struct sk_buff *skb)
319{
320 struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb);
321 struct cxgbit_sock *csk = lro_cb->csk;
322
323 csk->lro_skb = NULL;
324
325 __skb_unlink(skb, &lro_mgr->lroq);
326 cxgbit_queue_lro_skb(csk, skb);
327
328 cxgbit_put_csk(csk);
329
330 lro_mgr->lro_pkts++;
331 lro_mgr->lro_session_cnt--;
332}
333
334static void cxgbit_uld_lro_flush(struct t4_lro_mgr *lro_mgr)
335{
336 struct sk_buff *skb;
337
338 while ((skb = skb_peek(&lro_mgr->lroq)))
339 cxgbit_lro_flush(lro_mgr, skb);
340}
341
342static int
343cxgbit_lro_receive(struct cxgbit_sock *csk, u8 op, const __be64 *rsp,
344 const struct pkt_gl *gl, struct t4_lro_mgr *lro_mgr,
345 struct napi_struct *napi)
346{
347 struct sk_buff *skb;
348 struct cxgbit_lro_cb *lro_cb;
349
350 if (!csk) {
351 pr_err("%s: csk NULL, op 0x%x.\n", __func__, op);
352 goto out;
353 }
354
355 if (csk->lro_skb)
356 goto add_packet;
357
358start_lro:
359 if (lro_mgr->lro_session_cnt >= MAX_LRO_SESSIONS) {
360 cxgbit_uld_lro_flush(lro_mgr);
361 goto start_lro;
362 }
363
364 skb = cxgbit_lro_init_skb(csk, op, gl, rsp, napi);
365 if (unlikely(!skb))
366 goto out;
367
368 csk->lro_skb = skb;
369
370 __skb_queue_tail(&lro_mgr->lroq, skb);
371 lro_mgr->lro_session_cnt++;
372
373add_packet:
374 skb = csk->lro_skb;
375 lro_cb = cxgbit_skb_lro_cb(skb);
376
377 if ((gl && (((skb_shinfo(skb)->nr_frags + gl->nfrags) >
378 MAX_SKB_FRAGS) || (lro_cb->pdu_totallen >= LRO_FLUSH_LEN_MAX))) ||
379 (lro_cb->pdu_idx >= MAX_SKB_FRAGS)) {
380 cxgbit_lro_flush(lro_mgr, skb);
381 goto start_lro;
382 }
383
384 if (gl)
385 cxgbit_lro_add_packet_gl(skb, op, gl);
386 else
387 cxgbit_lro_add_packet_rsp(skb, op, rsp);
388
389 lro_mgr->lro_merged++;
390
391 return 0;
392
393out:
394 return -1;
395}
396
397static int
398cxgbit_uld_lro_rx_handler(void *hndl, const __be64 *rsp,
399 const struct pkt_gl *gl, struct t4_lro_mgr *lro_mgr,
400 struct napi_struct *napi)
401{
402 struct cxgbit_device *cdev = hndl;
403 struct cxgb4_lld_info *lldi = &cdev->lldi;
404 struct cpl_tx_data *rpl = NULL;
405 struct cxgbit_sock *csk = NULL;
406 unsigned int tid = 0;
407 struct sk_buff *skb;
408 unsigned int op = *(u8 *)rsp;
409 bool lro_flush = true;
410
411 switch (op) {
412 case CPL_ISCSI_HDR:
413 case CPL_ISCSI_DATA:
414 case CPL_RX_ISCSI_DDP:
415 case CPL_FW4_ACK:
416 lro_flush = false;
417 case CPL_ABORT_RPL_RSS:
418 case CPL_PASS_ESTABLISH:
419 case CPL_PEER_CLOSE:
420 case CPL_CLOSE_CON_RPL:
421 case CPL_ABORT_REQ_RSS:
422 case CPL_SET_TCB_RPL:
423 case CPL_RX_DATA:
424 rpl = gl ? (struct cpl_tx_data *)gl->va :
425 (struct cpl_tx_data *)(rsp + 1);
426 tid = GET_TID(rpl);
427 csk = lookup_tid(lldi->tids, tid);
428 break;
429 default:
430 break;
431 }
432
433 if (csk && csk->lro_skb && lro_flush)
434 cxgbit_lro_flush(lro_mgr, csk->lro_skb);
435
436 if (!gl) {
437 unsigned int len;
438
439 if (op == CPL_RX_ISCSI_DDP) {
440 if (!cxgbit_lro_receive(csk, op, rsp, NULL, lro_mgr,
441 napi))
442 return 0;
443 }
444
445 len = 64 - sizeof(struct rsp_ctrl) - 8;
446 skb = napi_alloc_skb(napi, len);
447 if (!skb)
448 goto nomem;
449 __skb_put(skb, len);
450 skb_copy_to_linear_data(skb, &rsp[1], len);
451 } else {
452 if (unlikely(op != *(u8 *)gl->va)) {
453 pr_info("? FL 0x%p,RSS%#llx,FL %#llx,len %u.\n",
454 gl->va, be64_to_cpu(*rsp),
455 be64_to_cpu(*(u64 *)gl->va),
456 gl->tot_len);
457 return 0;
458 }
459
460 if (op == CPL_ISCSI_HDR || op == CPL_ISCSI_DATA) {
461 if (!cxgbit_lro_receive(csk, op, rsp, gl, lro_mgr,
462 napi))
463 return 0;
464 }
465
466#define RX_PULL_LEN 128
467 skb = cxgb4_pktgl_to_skb(gl, RX_PULL_LEN, RX_PULL_LEN);
468 if (unlikely(!skb))
469 goto nomem;
470 }
471
472 rpl = (struct cpl_tx_data *)skb->data;
473 op = rpl->ot.opcode;
474 cxgbit_skcb_rx_opcode(skb) = op;
475
476 pr_debug("cdev %p, opcode 0x%x(0x%x,0x%x), skb %p.\n",
477 cdev, op, rpl->ot.opcode_tid,
478 ntohl(rpl->ot.opcode_tid), skb);
479
480 if (op < NUM_CPL_CMDS && cxgbit_cplhandlers[op]) {
481 cxgbit_cplhandlers[op](cdev, skb);
482 } else {
483 pr_err("No handler for opcode 0x%x.\n", op);
484 __kfree_skb(skb);
485 }
486 return 0;
487nomem:
488 pr_err("%s OOM bailing out.\n", __func__);
489 return 1;
490}
491
492#ifdef CONFIG_CHELSIO_T4_DCB
493struct cxgbit_dcb_work {
494 struct dcb_app_type dcb_app;
495 struct work_struct work;
496};
497
498static void
499cxgbit_update_dcb_priority(struct cxgbit_device *cdev, u8 port_id,
500 u8 dcb_priority, u16 port_num)
501{
502 struct cxgbit_sock *csk;
503 struct sk_buff *skb;
504 u16 local_port;
505 bool wakeup_thread = false;
506
507 spin_lock_bh(&cdev->cskq.lock);
508 list_for_each_entry(csk, &cdev->cskq.list, list) {
509 if (csk->port_id != port_id)
510 continue;
511
512 if (csk->com.local_addr.ss_family == AF_INET6) {
513 struct sockaddr_in6 *sock_in6;
514
515 sock_in6 = (struct sockaddr_in6 *)&csk->com.local_addr;
516 local_port = ntohs(sock_in6->sin6_port);
517 } else {
518 struct sockaddr_in *sock_in;
519
520 sock_in = (struct sockaddr_in *)&csk->com.local_addr;
521 local_port = ntohs(sock_in->sin_port);
522 }
523
524 if (local_port != port_num)
525 continue;
526
527 if (csk->dcb_priority == dcb_priority)
528 continue;
529
530 skb = alloc_skb(0, GFP_ATOMIC);
531 if (!skb)
532 continue;
533
534 spin_lock(&csk->rxq.lock);
535 __skb_queue_tail(&csk->rxq, skb);
536 if (skb_queue_len(&csk->rxq) == 1)
537 wakeup_thread = true;
538 spin_unlock(&csk->rxq.lock);
539
540 if (wakeup_thread) {
541 wake_up(&csk->waitq);
542 wakeup_thread = false;
543 }
544 }
545 spin_unlock_bh(&cdev->cskq.lock);
546}
547
548static void cxgbit_dcb_workfn(struct work_struct *work)
549{
550 struct cxgbit_dcb_work *dcb_work;
551 struct net_device *ndev;
552 struct cxgbit_device *cdev = NULL;
553 struct dcb_app_type *iscsi_app;
554 u8 priority, port_id = 0xff;
555
556 dcb_work = container_of(work, struct cxgbit_dcb_work, work);
557 iscsi_app = &dcb_work->dcb_app;
558
559 if (iscsi_app->dcbx & DCB_CAP_DCBX_VER_IEEE) {
560 if (iscsi_app->app.selector != IEEE_8021QAZ_APP_SEL_ANY)
561 goto out;
562
563 priority = iscsi_app->app.priority;
564
565 } else if (iscsi_app->dcbx & DCB_CAP_DCBX_VER_CEE) {
566 if (iscsi_app->app.selector != DCB_APP_IDTYPE_PORTNUM)
567 goto out;
568
569 if (!iscsi_app->app.priority)
570 goto out;
571
572 priority = ffs(iscsi_app->app.priority) - 1;
573 } else {
574 goto out;
575 }
576
577 pr_debug("priority for ifid %d is %u\n",
578 iscsi_app->ifindex, priority);
579
580 ndev = dev_get_by_index(&init_net, iscsi_app->ifindex);
581
582 if (!ndev)
583 goto out;
584
585 mutex_lock(&cdev_list_lock);
586 cdev = cxgbit_find_device(ndev, &port_id);
587
588 dev_put(ndev);
589
590 if (!cdev) {
591 mutex_unlock(&cdev_list_lock);
592 goto out;
593 }
594
595 cxgbit_update_dcb_priority(cdev, port_id, priority,
596 iscsi_app->app.protocol);
597 mutex_unlock(&cdev_list_lock);
598out:
599 kfree(dcb_work);
600}
601
602static int
603cxgbit_dcbevent_notify(struct notifier_block *nb, unsigned long action,
604 void *data)
605{
606 struct cxgbit_dcb_work *dcb_work;
607 struct dcb_app_type *dcb_app = data;
608
609 dcb_work = kzalloc(sizeof(*dcb_work), GFP_ATOMIC);
610 if (!dcb_work)
611 return NOTIFY_DONE;
612
613 dcb_work->dcb_app = *dcb_app;
614 INIT_WORK(&dcb_work->work, cxgbit_dcb_workfn);
615 schedule_work(&dcb_work->work);
616 return NOTIFY_OK;
617}
618#endif
619
620static enum target_prot_op cxgbit_get_sup_prot_ops(struct iscsi_conn *conn)
621{
622 return TARGET_PROT_NORMAL;
623}
624
625static struct iscsit_transport cxgbit_transport = {
626 .name = DRV_NAME,
627 .transport_type = ISCSI_CXGBIT,
628 .rdma_shutdown = false,
629 .priv_size = sizeof(struct cxgbit_cmd),
630 .owner = THIS_MODULE,
631 .iscsit_setup_np = cxgbit_setup_np,
632 .iscsit_accept_np = cxgbit_accept_np,
633 .iscsit_free_np = cxgbit_free_np,
634 .iscsit_free_conn = cxgbit_free_conn,
635 .iscsit_get_login_rx = cxgbit_get_login_rx,
636 .iscsit_put_login_tx = cxgbit_put_login_tx,
637 .iscsit_immediate_queue = iscsit_immediate_queue,
638 .iscsit_response_queue = iscsit_response_queue,
639 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
640 .iscsit_queue_data_in = iscsit_queue_rsp,
641 .iscsit_queue_status = iscsit_queue_rsp,
642 .iscsit_xmit_pdu = cxgbit_xmit_pdu,
643 .iscsit_get_r2t_ttt = cxgbit_get_r2t_ttt,
644 .iscsit_get_rx_pdu = cxgbit_get_rx_pdu,
645 .iscsit_validate_params = cxgbit_validate_params,
646 .iscsit_release_cmd = cxgbit_release_cmd,
647 .iscsit_aborted_task = iscsit_aborted_task,
648 .iscsit_get_sup_prot_ops = cxgbit_get_sup_prot_ops,
649};
650
651static struct cxgb4_uld_info cxgbit_uld_info = {
652 .name = DRV_NAME,
653 .add = cxgbit_uld_add,
654 .state_change = cxgbit_uld_state_change,
655 .lro_rx_handler = cxgbit_uld_lro_rx_handler,
656 .lro_flush = cxgbit_uld_lro_flush,
657};
658
659#ifdef CONFIG_CHELSIO_T4_DCB
660static struct notifier_block cxgbit_dcbevent_nb = {
661 .notifier_call = cxgbit_dcbevent_notify,
662};
663#endif
664
665static int __init cxgbit_init(void)
666{
667 cxgb4_register_uld(CXGB4_ULD_ISCSIT, &cxgbit_uld_info);
668 iscsit_register_transport(&cxgbit_transport);
669
670#ifdef CONFIG_CHELSIO_T4_DCB
671 pr_info("%s dcb enabled.\n", DRV_NAME);
672 register_dcbevent_notifier(&cxgbit_dcbevent_nb);
673#endif
674 BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, cb) <
675 sizeof(union cxgbit_skb_cb));
676 return 0;
677}
678
679static void __exit cxgbit_exit(void)
680{
681 struct cxgbit_device *cdev, *tmp;
682
683#ifdef CONFIG_CHELSIO_T4_DCB
684 unregister_dcbevent_notifier(&cxgbit_dcbevent_nb);
685#endif
686 mutex_lock(&cdev_list_lock);
687 list_for_each_entry_safe(cdev, tmp, &cdev_list_head, list) {
688 list_del(&cdev->list);
689 cxgbit_put_cdev(cdev);
690 }
691 mutex_unlock(&cdev_list_lock);
692 iscsit_unregister_transport(&cxgbit_transport);
693 cxgb4_unregister_uld(CXGB4_ULD_ISCSIT);
694}
695
696module_init(cxgbit_init);
697module_exit(cxgbit_exit);
698
699MODULE_DESCRIPTION("Chelsio iSCSI target offload driver");
700MODULE_AUTHOR("Chelsio Communications");
701MODULE_VERSION(DRV_VERSION);
702MODULE_LICENSE("GPL");
703
