1	// SPDX-License-Identifier: GPL-2.0-or-later
2	/*******************************************************************************
3	* This file contains iSCSI extentions for RDMA (iSER) Verbs
4	*
5	* (c) Copyright 2013 Datera, Inc.
6	*
7	* Nicholas A. Bellinger <nab@linux-iscsi.org>
8	*
9	****************************************************************************/
10
11	#include <linux/string.h>
12	#include <linux/module.h>
13	#include <linux/scatterlist.h>
14	#include <linux/socket.h>
15	#include <linux/in.h>
16	#include <linux/in6.h>
17	#include <rdma/ib_verbs.h>
18	#include <rdma/ib_cm.h>
19	#include <rdma/rdma_cm.h>
20	#include <target/target_core_base.h>
21	#include <target/target_core_fabric.h>
22	#include <target/iscsi/iscsi_transport.h>
23	#include <linux/semaphore.h>
24
25	#include "ib_isert.h"
26
27	static int isert_debug_level;
28	module_param_named(debug_level, isert_debug_level, int, 0644);
29	MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:0)");
30
31	static int isert_sg_tablesize_set(const char *val,
32	const struct kernel_param *kp);
33	static const struct kernel_param_ops sg_tablesize_ops = {
34	.set = isert_sg_tablesize_set,
35	.get = param_get_int,
36	};
37
38	static int isert_sg_tablesize = ISCSI_ISER_MIN_SG_TABLESIZE;
39	module_param_cb(sg_tablesize, &sg_tablesize_ops, &isert_sg_tablesize, 0644);
40	MODULE_PARM_DESC(sg_tablesize,
41	"Number of gather/scatter entries in a single scsi command, should >= 128 (default: 128, max: 4096)");
42
43	static DEFINE_MUTEX(device_list_mutex);
44	static LIST_HEAD(device_list);
45	static struct workqueue_struct *isert_login_wq;
46	static struct workqueue_struct *isert_comp_wq;
47	static struct workqueue_struct *isert_release_wq;
48
49	static int
50	isert_put_response(struct iscsit_conn *conn, struct iscsit_cmd *cmd);
51	static int
52	isert_login_post_recv(struct isert_conn *isert_conn);
53	static int
54	isert_rdma_accept(struct isert_conn *isert_conn);
55	struct rdma_cm_id *isert_setup_id(struct isert_np *isert_np);
56
57	static void isert_release_work(struct work_struct *work);
58	static void isert_recv_done(struct ib_cq *cq, struct ib_wc *wc);
59	static void isert_send_done(struct ib_cq *cq, struct ib_wc *wc);
60	static void isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc);
61	static void isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc);
62
63	static int isert_sg_tablesize_set(const char *val, const struct kernel_param *kp)
64	{
65	int n = 0, ret;
66
67	ret = kstrtoint(s: val, base: 10, res: &n);
68	if (ret != 0 || n < ISCSI_ISER_MIN_SG_TABLESIZE ||
69	n > ISCSI_ISER_MAX_SG_TABLESIZE)
70	return -EINVAL;
71
72	return param_set_int(val, kp);
73	}
74
75	static inline bool
76	isert_prot_cmd(struct isert_conn *conn, struct se_cmd *cmd)
77	{
78	return (conn->pi_support &&
79	cmd->prot_op != TARGET_PROT_NORMAL);
80	}
81
82	static void
83	isert_qp_event_callback(struct ib_event *e, void *context)
84	{
85	struct isert_conn *isert_conn = context;
86
87	isert_err("%s (%d): conn %p\n",
88	ib_event_msg(e->event), e->event, isert_conn);
89
90	switch (e->event) {
91	case IB_EVENT_COMM_EST:
92	rdma_notify(id: isert_conn->cm_id, event: IB_EVENT_COMM_EST);
93	break;
94	case IB_EVENT_QP_LAST_WQE_REACHED:
95	isert_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED\n");
96	break;
97	default:
98	break;
99	}
100	}
101
102	static struct ib_qp *
103	isert_create_qp(struct isert_conn *isert_conn,
104	struct rdma_cm_id *cma_id)
105	{
106	u32 cq_size = ISERT_QP_MAX_REQ_DTOS + ISERT_QP_MAX_RECV_DTOS + 2;
107	struct isert_device *device = isert_conn->device;
108	struct ib_device *ib_dev = device->ib_device;
109	struct ib_qp_init_attr attr;
110	int ret, factor;
111
112	isert_conn->cq = ib_cq_pool_get(dev: ib_dev, nr_cqe: cq_size, comp_vector_hint: -1, poll_ctx: IB_POLL_WORKQUEUE);
113	if (IS_ERR(ptr: isert_conn->cq)) {
114	isert_err("Unable to allocate cq\n");
115	ret = PTR_ERR(ptr: isert_conn->cq);
116	return ERR_PTR(error: ret);
117	}
118	isert_conn->cq_size = cq_size;
119
120	memset(&attr, 0, sizeof(struct ib_qp_init_attr));
121	attr.event_handler = isert_qp_event_callback;
122	attr.qp_context = isert_conn;
123	attr.send_cq = isert_conn->cq;
124	attr.recv_cq = isert_conn->cq;
125	attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS + 1;
126	attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS + 1;
127	factor = rdma_rw_mr_factor(device: device->ib_device, port_num: cma_id->port_num,
128	maxpages: isert_sg_tablesize);
129	attr.cap.max_rdma_ctxs = ISCSI_DEF_XMIT_CMDS_MAX * factor;
130	attr.cap.max_send_sge = device->ib_device->attrs.max_send_sge;
131	attr.cap.max_recv_sge = 1;
132	attr.sq_sig_type = IB_SIGNAL_REQ_WR;
133	attr.qp_type = IB_QPT_RC;
134	if (device->pi_capable)
135	attr.create_flags |= IB_QP_CREATE_INTEGRITY_EN;
136
137	ret = rdma_create_qp(id: cma_id, pd: device->pd, qp_init_attr: &attr);
138	if (ret) {
139	isert_err("rdma_create_qp failed for cma_id %d\n", ret);
140	ib_cq_pool_put(cq: isert_conn->cq, nr_cqe: isert_conn->cq_size);
141
142	return ERR_PTR(error: ret);
143	}
144
145	return cma_id->qp;
146	}
147
148	static int
149	isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
150	{
151	struct isert_device *device = isert_conn->device;
152	struct ib_device *ib_dev = device->ib_device;
153	struct iser_rx_desc *rx_desc;
154	struct ib_sge *rx_sg;
155	u64 dma_addr;
156	int i, j;
157
158	isert_conn->rx_descs = kcalloc(ISERT_QP_MAX_RECV_DTOS,
159	size: sizeof(struct iser_rx_desc),
160	GFP_KERNEL);
161	if (!isert_conn->rx_descs)
162	return -ENOMEM;
163
164	rx_desc = isert_conn->rx_descs;
165
166	for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
167	dma_addr = ib_dma_map_single(dev: ib_dev, cpu_addr: rx_desc->buf,
168	ISER_RX_SIZE, direction: DMA_FROM_DEVICE);
169	if (ib_dma_mapping_error(dev: ib_dev, dma_addr))
170	goto dma_map_fail;
171
172	rx_desc->dma_addr = dma_addr;
173
174	rx_sg = &rx_desc->rx_sg;
175	rx_sg->addr = rx_desc->dma_addr + isert_get_hdr_offset(desc: rx_desc);
176	rx_sg->length = ISER_RX_PAYLOAD_SIZE;
177	rx_sg->lkey = device->pd->local_dma_lkey;
178	rx_desc->rx_cqe.done = isert_recv_done;
179	}
180
181	return 0;
182
183	dma_map_fail:
184	rx_desc = isert_conn->rx_descs;
185	for (j = 0; j < i; j++, rx_desc++) {
186	ib_dma_unmap_single(dev: ib_dev, addr: rx_desc->dma_addr,
187	ISER_RX_SIZE, direction: DMA_FROM_DEVICE);
188	}
189	kfree(objp: isert_conn->rx_descs);
190	isert_conn->rx_descs = NULL;
191	isert_err("conn %p failed to allocate rx descriptors\n", isert_conn);
192	return -ENOMEM;
193	}
194
195	static void
196	isert_free_rx_descriptors(struct isert_conn *isert_conn)
197	{
198	struct ib_device *ib_dev = isert_conn->device->ib_device;
199	struct iser_rx_desc *rx_desc;
200	int i;
201
202	if (!isert_conn->rx_descs)
203	return;
204
205	rx_desc = isert_conn->rx_descs;
206	for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
207	ib_dma_unmap_single(dev: ib_dev, addr: rx_desc->dma_addr,
208	ISER_RX_SIZE, direction: DMA_FROM_DEVICE);
209	}
210
211	kfree(objp: isert_conn->rx_descs);
212	isert_conn->rx_descs = NULL;
213	}
214
215	static int
216	isert_create_device_ib_res(struct isert_device *device)
217	{
218	struct ib_device *ib_dev = device->ib_device;
219	int ret;
220
221	isert_dbg("devattr->max_send_sge: %d devattr->max_recv_sge %d\n",
222	ib_dev->attrs.max_send_sge, ib_dev->attrs.max_recv_sge);
223	isert_dbg("devattr->max_sge_rd: %d\n", ib_dev->attrs.max_sge_rd);
224
225	device->pd = ib_alloc_pd(ib_dev, 0);
226	if (IS_ERR(ptr: device->pd)) {
227	ret = PTR_ERR(ptr: device->pd);
228	isert_err("failed to allocate pd, device %p, ret=%d\n",
229	device, ret);
230	return ret;
231	}
232
233	/* Check signature cap */
234	if (ib_dev->attrs.kernel_cap_flags & IBK_INTEGRITY_HANDOVER)
235	device->pi_capable = true;
236	else
237	device->pi_capable = false;
238
239	return 0;
240	}
241
242	static void
243	isert_free_device_ib_res(struct isert_device *device)
244	{
245	isert_info("device %p\n", device);
246
247	ib_dealloc_pd(pd: device->pd);
248	}
249
250	static void
251	isert_device_put(struct isert_device *device)
252	{
253	mutex_lock(&device_list_mutex);
254	device->refcount--;
255	isert_info("device %p refcount %d\n", device, device->refcount);
256	if (!device->refcount) {
257	isert_free_device_ib_res(device);
258	list_del(entry: &device->dev_node);
259	kfree(objp: device);
260	}
261	mutex_unlock(lock: &device_list_mutex);
262	}
263
264	static struct isert_device *
265	isert_device_get(struct rdma_cm_id *cma_id)
266	{
267	struct isert_device *device;
268	int ret;
269
270	mutex_lock(&device_list_mutex);
271	list_for_each_entry(device, &device_list, dev_node) {
272	if (device->ib_device->node_guid == cma_id->device->node_guid) {
273	device->refcount++;
274	isert_info("Found iser device %p refcount %d\n",
275	device, device->refcount);
276	mutex_unlock(lock: &device_list_mutex);
277	return device;
278	}
279	}
280
281	device = kzalloc(size: sizeof(struct isert_device), GFP_KERNEL);
282	if (!device) {
283	mutex_unlock(lock: &device_list_mutex);
284	return ERR_PTR(error: -ENOMEM);
285	}
286
287	INIT_LIST_HEAD(list: &device->dev_node);
288
289	device->ib_device = cma_id->device;
290	ret = isert_create_device_ib_res(device);
291	if (ret) {
292	kfree(objp: device);
293	mutex_unlock(lock: &device_list_mutex);
294	return ERR_PTR(error: ret);
295	}
296
297	device->refcount++;
298	list_add_tail(new: &device->dev_node, head: &device_list);
299	isert_info("Created a new iser device %p refcount %d\n",
300	device, device->refcount);
301	mutex_unlock(lock: &device_list_mutex);
302
303	return device;
304	}
305
306	static void
307	isert_init_conn(struct isert_conn *isert_conn)
308	{
309	isert_conn->state = ISER_CONN_INIT;
310	INIT_LIST_HEAD(list: &isert_conn->node);
311	init_completion(x: &isert_conn->login_comp);
312	init_completion(x: &isert_conn->login_req_comp);
313	init_waitqueue_head(&isert_conn->rem_wait);
314	kref_init(kref: &isert_conn->kref);
315	mutex_init(&isert_conn->mutex);
316	INIT_WORK(&isert_conn->release_work, isert_release_work);
317	}
318
319	static void
320	isert_free_login_buf(struct isert_conn *isert_conn)
321	{
322	struct ib_device *ib_dev = isert_conn->device->ib_device;
323
324	ib_dma_unmap_single(dev: ib_dev, addr: isert_conn->login_rsp_dma,
325	ISER_RX_PAYLOAD_SIZE, direction: DMA_TO_DEVICE);
326	kfree(objp: isert_conn->login_rsp_buf);
327
328	ib_dma_unmap_single(dev: ib_dev, addr: isert_conn->login_desc->dma_addr,
329	ISER_RX_SIZE, direction: DMA_FROM_DEVICE);
330	kfree(objp: isert_conn->login_desc);
331	}
332
333	static int
334	isert_alloc_login_buf(struct isert_conn *isert_conn,
335	struct ib_device *ib_dev)
336	{
337	int ret;
338
339	isert_conn->login_desc = kzalloc(size: sizeof(*isert_conn->login_desc),
340	GFP_KERNEL);
341	if (!isert_conn->login_desc)
342	return -ENOMEM;
343
344	isert_conn->login_desc->dma_addr = ib_dma_map_single(dev: ib_dev,
345	cpu_addr: isert_conn->login_desc->buf,
346	ISER_RX_SIZE, direction: DMA_FROM_DEVICE);
347	ret = ib_dma_mapping_error(dev: ib_dev, dma_addr: isert_conn->login_desc->dma_addr);
348	if (ret) {
349	isert_err("login_desc dma mapping error: %d\n", ret);
350	isert_conn->login_desc->dma_addr = 0;
351	goto out_free_login_desc;
352	}
353
354	isert_conn->login_rsp_buf = kzalloc(ISER_RX_PAYLOAD_SIZE, GFP_KERNEL);
355	if (!isert_conn->login_rsp_buf) {
356	ret = -ENOMEM;
357	goto out_unmap_login_desc;
358	}
359
360	isert_conn->login_rsp_dma = ib_dma_map_single(dev: ib_dev,
361	cpu_addr: isert_conn->login_rsp_buf,
362	ISER_RX_PAYLOAD_SIZE, direction: DMA_TO_DEVICE);
363	ret = ib_dma_mapping_error(dev: ib_dev, dma_addr: isert_conn->login_rsp_dma);
364	if (ret) {
365	isert_err("login_rsp_dma mapping error: %d\n", ret);
366	isert_conn->login_rsp_dma = 0;
367	goto out_free_login_rsp_buf;
368	}
369
370	return 0;
371
372	out_free_login_rsp_buf:
373	kfree(objp: isert_conn->login_rsp_buf);
374	out_unmap_login_desc:
375	ib_dma_unmap_single(dev: ib_dev, addr: isert_conn->login_desc->dma_addr,
376	ISER_RX_SIZE, direction: DMA_FROM_DEVICE);
377	out_free_login_desc:
378	kfree(objp: isert_conn->login_desc);
379	return ret;
380	}
381
382	static void
383	isert_set_nego_params(struct isert_conn *isert_conn,
384	struct rdma_conn_param *param)
385	{
386	struct ib_device_attr *attr = &isert_conn->device->ib_device->attrs;
387
388	/* Set max inflight RDMA READ requests */
389	isert_conn->initiator_depth = min_t(u8, param->initiator_depth,
390	attr->max_qp_init_rd_atom);
391	isert_dbg("Using initiator_depth: %u\n", isert_conn->initiator_depth);
392
393	if (param->private_data) {
394	u8 flags = *(u8 *)param->private_data;
395
396	/*
397	* use remote invalidation if the both initiator
398	* and the HCA support it
399	*/
400	isert_conn->snd_w_inv = !(flags & ISER_SEND_W_INV_NOT_SUP) &&
401	(attr->device_cap_flags &
402	IB_DEVICE_MEM_MGT_EXTENSIONS);
403	if (isert_conn->snd_w_inv)
404	isert_info("Using remote invalidation\n");
405	}
406	}
407
408	static void
409	isert_destroy_qp(struct isert_conn *isert_conn)
410	{
411	ib_destroy_qp(qp: isert_conn->qp);
412	ib_cq_pool_put(cq: isert_conn->cq, nr_cqe: isert_conn->cq_size);
413	}
414
415	static int
416	isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
417	{
418	struct isert_np *isert_np = cma_id->context;
419	struct iscsi_np *np = isert_np->np;
420	struct isert_conn *isert_conn;
421	struct isert_device *device;
422	int ret = 0;
423
424	spin_lock_bh(lock: &np->np_thread_lock);
425	if (!np->enabled) {
426	spin_unlock_bh(lock: &np->np_thread_lock);
427	isert_dbg("iscsi_np is not enabled, reject connect request\n");
428	return rdma_reject(id: cma_id, NULL, private_data_len: 0, reason: IB_CM_REJ_CONSUMER_DEFINED);
429	}
430	spin_unlock_bh(lock: &np->np_thread_lock);
431
432	isert_dbg("cma_id: %p, portal: %p\n",
433	cma_id, cma_id->context);
434
435	isert_conn = kzalloc(size: sizeof(struct isert_conn), GFP_KERNEL);
436	if (!isert_conn)
437	return -ENOMEM;
438
439	isert_init_conn(isert_conn);
440	isert_conn->cm_id = cma_id;
441
442	device = isert_device_get(cma_id);
443	if (IS_ERR(ptr: device)) {
444	ret = PTR_ERR(ptr: device);
445	goto out;
446	}
447	isert_conn->device = device;
448
449	ret = isert_alloc_login_buf(isert_conn, ib_dev: cma_id->device);
450	if (ret)
451	goto out_conn_dev;
452
453	isert_set_nego_params(isert_conn, param: &event->param.conn);
454
455	isert_conn->qp = isert_create_qp(isert_conn, cma_id);
456	if (IS_ERR(ptr: isert_conn->qp)) {
457	ret = PTR_ERR(ptr: isert_conn->qp);
458	goto out_rsp_dma_map;
459	}
460
461	ret = isert_login_post_recv(isert_conn);
462	if (ret)
463	goto out_destroy_qp;
464
465	ret = isert_rdma_accept(isert_conn);
466	if (ret)
467	goto out_destroy_qp;
468
469	mutex_lock(&isert_np->mutex);
470	list_add_tail(new: &isert_conn->node, head: &isert_np->accepted);
471	mutex_unlock(lock: &isert_np->mutex);
472
473	return 0;
474
475	out_destroy_qp:
476	isert_destroy_qp(isert_conn);
477	out_rsp_dma_map:
478	isert_free_login_buf(isert_conn);
479	out_conn_dev:
480	isert_device_put(device);
481	out:
482	kfree(objp: isert_conn);
483	rdma_reject(id: cma_id, NULL, private_data_len: 0, reason: IB_CM_REJ_CONSUMER_DEFINED);
484	return ret;
485	}
486
487	static void
488	isert_connect_release(struct isert_conn *isert_conn)
489	{
490	struct isert_device *device = isert_conn->device;
491
492	isert_dbg("conn %p\n", isert_conn);
493
494	BUG_ON(!device);
495
496	isert_free_rx_descriptors(isert_conn);
497	if (isert_conn->cm_id &&
498	!isert_conn->dev_removed)
499	rdma_destroy_id(id: isert_conn->cm_id);
500
501	if (isert_conn->qp)
502	isert_destroy_qp(isert_conn);
503
504	if (isert_conn->login_desc)
505	isert_free_login_buf(isert_conn);
506
507	isert_device_put(device);
508
509	if (isert_conn->dev_removed)
510	wake_up_interruptible(&isert_conn->rem_wait);
511	else
512	kfree(objp: isert_conn);
513	}
514
515	static void
516	isert_connected_handler(struct rdma_cm_id *cma_id)
517	{
518	struct isert_conn *isert_conn = cma_id->qp->qp_context;
519	struct isert_np *isert_np = cma_id->context;
520
521	isert_info("conn %p\n", isert_conn);
522
523	mutex_lock(&isert_conn->mutex);
524	isert_conn->state = ISER_CONN_UP;
525	kref_get(kref: &isert_conn->kref);
526	mutex_unlock(lock: &isert_conn->mutex);
527
528	mutex_lock(&isert_np->mutex);
529	list_move_tail(list: &isert_conn->node, head: &isert_np->pending);
530	mutex_unlock(lock: &isert_np->mutex);
531
532	isert_info("np %p: Allow accept_np to continue\n", isert_np);
533	up(sem: &isert_np->sem);
534	}
535
536	static void
537	isert_release_kref(struct kref *kref)
538	{
539	struct isert_conn *isert_conn = container_of(kref,
540	struct isert_conn, kref);
541
542	isert_info("conn %p final kref %s/%d\n", isert_conn, current->comm,
543	current->pid);
544
545	isert_connect_release(isert_conn);
546	}
547
548	static void
549	isert_put_conn(struct isert_conn *isert_conn)
550	{
551	kref_put(kref: &isert_conn->kref, release: isert_release_kref);
552	}
553
554	static void
555	isert_handle_unbound_conn(struct isert_conn *isert_conn)
556	{
557	struct isert_np *isert_np = isert_conn->cm_id->context;
558
559	mutex_lock(&isert_np->mutex);
560	if (!list_empty(head: &isert_conn->node)) {
561	/*
562	* This means iscsi doesn't know this connection
563	* so schedule a cleanup ourselves
564	*/
565	list_del_init(entry: &isert_conn->node);
566	isert_put_conn(isert_conn);
567	queue_work(wq: isert_release_wq, work: &isert_conn->release_work);
568	}
569	mutex_unlock(lock: &isert_np->mutex);
570	}
571
572	/**
573	* isert_conn_terminate() - Initiate connection termination
574	* @isert_conn: isert connection struct
575	*
576	* Notes:
577	* In case the connection state is BOUND, move state
578	* to TEMINATING and start teardown sequence (rdma_disconnect).
579	* In case the connection state is UP, complete flush as well.
580	*
581	* This routine must be called with mutex held. Thus it is
582	* safe to call multiple times.
583	*/
584	static void
585	isert_conn_terminate(struct isert_conn *isert_conn)
586	{
587	int err;
588
589	if (isert_conn->state >= ISER_CONN_TERMINATING)
590	return;
591
592	isert_info("Terminating conn %p state %d\n",
593	isert_conn, isert_conn->state);
594	isert_conn->state = ISER_CONN_TERMINATING;
595	err = rdma_disconnect(id: isert_conn->cm_id);
596	if (err)
597	isert_warn("Failed rdma_disconnect isert_conn %p\n",
598	isert_conn);
599	}
600
601	static int
602	isert_np_cma_handler(struct isert_np *isert_np,
603	enum rdma_cm_event_type event)
604	{
605	isert_dbg("%s (%d): isert np %p\n",
606	rdma_event_msg(event), event, isert_np);
607
608	switch (event) {
609	case RDMA_CM_EVENT_DEVICE_REMOVAL:
610	isert_np->cm_id = NULL;
611	break;
612	case RDMA_CM_EVENT_ADDR_CHANGE:
613	isert_np->cm_id = isert_setup_id(isert_np);
614	if (IS_ERR(ptr: isert_np->cm_id)) {
615	isert_err("isert np %p setup id failed: %ld\n",
616	isert_np, PTR_ERR(isert_np->cm_id));
617	isert_np->cm_id = NULL;
618	}
619	break;
620	default:
621	isert_err("isert np %p Unexpected event %d\n",
622	isert_np, event);
623	}
624
625	return -1;
626	}
627
628	static int
629	isert_disconnected_handler(struct rdma_cm_id *cma_id,
630	enum rdma_cm_event_type event)
631	{
632	struct isert_conn *isert_conn = cma_id->qp->qp_context;
633
634	mutex_lock(&isert_conn->mutex);
635	switch (isert_conn->state) {
636	case ISER_CONN_TERMINATING:
637	break;
638	case ISER_CONN_UP:
639	isert_conn_terminate(isert_conn);
640	ib_drain_qp(qp: isert_conn->qp);
641	isert_handle_unbound_conn(isert_conn);
642	break;
643	case ISER_CONN_BOUND:
644	case ISER_CONN_FULL_FEATURE: /* FALLTHRU */
645	iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
646	break;
647	default:
648	isert_warn("conn %p terminating in state %d\n",
649	isert_conn, isert_conn->state);
650	}
651	mutex_unlock(lock: &isert_conn->mutex);
652
653	return 0;
654	}
655
656	static int
657	isert_connect_error(struct rdma_cm_id *cma_id)
658	{
659	struct isert_conn *isert_conn = cma_id->qp->qp_context;
660	struct isert_np *isert_np = cma_id->context;
661
662	ib_drain_qp(qp: isert_conn->qp);
663
664	mutex_lock(&isert_np->mutex);
665	list_del_init(entry: &isert_conn->node);
666	mutex_unlock(lock: &isert_np->mutex);
667	isert_conn->cm_id = NULL;
668	isert_put_conn(isert_conn);
669
670	return -1;
671	}
672
673	static int
674	isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
675	{
676	struct isert_np *isert_np = cma_id->context;
677	struct isert_conn *isert_conn;
678	int ret = 0;
679
680	isert_info("%s (%d): status %d id %p np %p\n",
681	rdma_event_msg(event->event), event->event,
682	event->status, cma_id, cma_id->context);
683
684	if (isert_np->cm_id == cma_id)
685	return isert_np_cma_handler(isert_np: cma_id->context, event: event->event);
686
687	switch (event->event) {
688	case RDMA_CM_EVENT_CONNECT_REQUEST:
689	ret = isert_connect_request(cma_id, event);
690	if (ret)
691	isert_err("failed handle connect request %d\n", ret);
692	break;
693	case RDMA_CM_EVENT_ESTABLISHED:
694	isert_connected_handler(cma_id);
695	break;
696	case RDMA_CM_EVENT_ADDR_CHANGE:
697	case RDMA_CM_EVENT_DISCONNECTED:
698	case RDMA_CM_EVENT_TIMEWAIT_EXIT: /* FALLTHRU */
699	ret = isert_disconnected_handler(cma_id, event: event->event);
700	break;
701	case RDMA_CM_EVENT_DEVICE_REMOVAL:
702	isert_conn = cma_id->qp->qp_context;
703	isert_conn->dev_removed = true;
704	isert_disconnected_handler(cma_id, event: event->event);
705	wait_event_interruptible(isert_conn->rem_wait,
706	isert_conn->state == ISER_CONN_DOWN);
707	kfree(objp: isert_conn);
708	/*
709	* return non-zero from the callback to destroy
710	* the rdma cm id
711	*/
712	return 1;
713	case RDMA_CM_EVENT_REJECTED:
714	isert_info("Connection rejected: %s\n",
715	rdma_reject_msg(cma_id, event->status));
716	fallthrough;
717	case RDMA_CM_EVENT_UNREACHABLE:
718	case RDMA_CM_EVENT_CONNECT_ERROR:
719	ret = isert_connect_error(cma_id);
720	break;
721	default:
722	isert_err("Unhandled RDMA CMA event: %d\n", event->event);
723	break;
724	}
725
726	return ret;
727	}
728
729	static int
730	isert_post_recvm(struct isert_conn *isert_conn, u32 count)
731	{
732	struct ib_recv_wr *rx_wr;
733	int i, ret;
734	struct iser_rx_desc *rx_desc;
735
736	for (rx_wr = isert_conn->rx_wr, i = 0; i < count; i++, rx_wr++) {
737	rx_desc = &isert_conn->rx_descs[i];
738
739	rx_wr->wr_cqe = &rx_desc->rx_cqe;
740	rx_wr->sg_list = &rx_desc->rx_sg;
741	rx_wr->num_sge = 1;
742	rx_wr->next = rx_wr + 1;
743	rx_desc->in_use = false;
744	}
745	rx_wr--;
746	rx_wr->next = NULL; /* mark end of work requests list */
747
748	ret = ib_post_recv(qp: isert_conn->qp, recv_wr: isert_conn->rx_wr, NULL);
749	if (ret)
750	isert_err("ib_post_recv() failed with ret: %d\n", ret);
751
752	return ret;
753	}
754
755	static int
756	isert_post_recv(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc)
757	{
758	struct ib_recv_wr rx_wr;
759	int ret;
760
761	if (!rx_desc->in_use) {
762	/*
763	* if the descriptor is not in-use we already reposted it
764	* for recv, so just silently return
765	*/
766	return 0;
767	}
768
769	rx_desc->in_use = false;
770	rx_wr.wr_cqe = &rx_desc->rx_cqe;
771	rx_wr.sg_list = &rx_desc->rx_sg;
772	rx_wr.num_sge = 1;
773	rx_wr.next = NULL;
774
775	ret = ib_post_recv(qp: isert_conn->qp, recv_wr: &rx_wr, NULL);
776	if (ret)
777	isert_err("ib_post_recv() failed with ret: %d\n", ret);
778
779	return ret;
780	}
781
782	static int
783	isert_login_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
784	{
785	struct ib_device *ib_dev = isert_conn->cm_id->device;
786	struct ib_send_wr send_wr;
787	int ret;
788
789	ib_dma_sync_single_for_device(dev: ib_dev, addr: tx_desc->dma_addr,
790	ISER_HEADERS_LEN, dir: DMA_TO_DEVICE);
791
792	tx_desc->tx_cqe.done = isert_login_send_done;
793
794	send_wr.next = NULL;
795	send_wr.wr_cqe = &tx_desc->tx_cqe;
796	send_wr.sg_list = tx_desc->tx_sg;
797	send_wr.num_sge = tx_desc->num_sge;
798	send_wr.opcode = IB_WR_SEND;
799	send_wr.send_flags = IB_SEND_SIGNALED;
800
801	ret = ib_post_send(qp: isert_conn->qp, send_wr: &send_wr, NULL);
802	if (ret)
803	isert_err("ib_post_send() failed, ret: %d\n", ret);
804
805	return ret;
806	}
807
808	static void
809	__isert_create_send_desc(struct isert_device *device,
810	struct iser_tx_desc *tx_desc)
811	{
812
813	memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl));
814	tx_desc->iser_header.flags = ISCSI_CTRL;
815
816	tx_desc->num_sge = 1;
817
818	if (tx_desc->tx_sg[0].lkey != device->pd->local_dma_lkey) {
819	tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
820	isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc);
821	}
822	}
823
824	static void
825	isert_create_send_desc(struct isert_conn *isert_conn,
826	struct isert_cmd *isert_cmd,
827	struct iser_tx_desc *tx_desc)
828	{
829	struct isert_device *device = isert_conn->device;
830	struct ib_device *ib_dev = device->ib_device;
831
832	ib_dma_sync_single_for_cpu(dev: ib_dev, addr: tx_desc->dma_addr,
833	ISER_HEADERS_LEN, dir: DMA_TO_DEVICE);
834
835	__isert_create_send_desc(device, tx_desc);
836	}
837
838	static int
839	isert_init_tx_hdrs(struct isert_conn *isert_conn,
840	struct iser_tx_desc *tx_desc)
841	{
842	struct isert_device *device = isert_conn->device;
843	struct ib_device *ib_dev = device->ib_device;
844	u64 dma_addr;
845
846	dma_addr = ib_dma_map_single(dev: ib_dev, cpu_addr: (void *)tx_desc,
847	ISER_HEADERS_LEN, direction: DMA_TO_DEVICE);
848	if (ib_dma_mapping_error(dev: ib_dev, dma_addr)) {
849	isert_err("ib_dma_mapping_error() failed\n");
850	return -ENOMEM;
851	}
852
853	tx_desc->dma_addr = dma_addr;
854	tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
855	tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
856	tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
857
858	isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\n",
859	tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length,
860	tx_desc->tx_sg[0].lkey);
861
862	return 0;
863	}
864
865	static void
866	isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
867	struct ib_send_wr *send_wr)
868	{
869	struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
870
871	tx_desc->tx_cqe.done = isert_send_done;
872	send_wr->wr_cqe = &tx_desc->tx_cqe;
873
874	if (isert_conn->snd_w_inv && isert_cmd->inv_rkey) {
875	send_wr->opcode = IB_WR_SEND_WITH_INV;
876	send_wr->ex.invalidate_rkey = isert_cmd->inv_rkey;
877	} else {
878	send_wr->opcode = IB_WR_SEND;
879	}
880
881	send_wr->sg_list = &tx_desc->tx_sg[0];
882	send_wr->num_sge = isert_cmd->tx_desc.num_sge;
883	send_wr->send_flags = IB_SEND_SIGNALED;
884	}
885
886	static int
887	isert_login_post_recv(struct isert_conn *isert_conn)
888	{
889	struct ib_recv_wr rx_wr;
890	struct ib_sge sge;
891	int ret;
892
893	memset(&sge, 0, sizeof(struct ib_sge));
894	sge.addr = isert_conn->login_desc->dma_addr +
895	isert_get_hdr_offset(desc: isert_conn->login_desc);
896	sge.length = ISER_RX_PAYLOAD_SIZE;
897	sge.lkey = isert_conn->device->pd->local_dma_lkey;
898
899	isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n",
900	sge.addr, sge.length, sge.lkey);
901
902	isert_conn->login_desc->rx_cqe.done = isert_login_recv_done;
903
904	memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
905	rx_wr.wr_cqe = &isert_conn->login_desc->rx_cqe;
906	rx_wr.sg_list = &sge;
907	rx_wr.num_sge = 1;
908
909	ret = ib_post_recv(qp: isert_conn->qp, recv_wr: &rx_wr, NULL);
910	if (ret)
911	isert_err("ib_post_recv() failed: %d\n", ret);
912
913	return ret;
914	}
915
916	static int
917	isert_put_login_tx(struct iscsit_conn *conn, struct iscsi_login *login,
918	u32 length)
919	{
920	struct isert_conn *isert_conn = conn->context;
921	struct isert_device *device = isert_conn->device;
922	struct ib_device *ib_dev = device->ib_device;
923	struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc;
924	int ret;
925
926	__isert_create_send_desc(device, tx_desc);
927
928	memcpy(&tx_desc->iscsi_header, &login->rsp[0],
929	sizeof(struct iscsi_hdr));
930
931	isert_init_tx_hdrs(isert_conn, tx_desc);
932
933	if (length > 0) {
934	struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
935
936	ib_dma_sync_single_for_cpu(dev: ib_dev, addr: isert_conn->login_rsp_dma,
937	size: length, dir: DMA_TO_DEVICE);
938
939	memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
940
941	ib_dma_sync_single_for_device(dev: ib_dev, addr: isert_conn->login_rsp_dma,
942	size: length, dir: DMA_TO_DEVICE);
943
944	tx_dsg->addr = isert_conn->login_rsp_dma;
945	tx_dsg->length = length;
946	tx_dsg->lkey = isert_conn->device->pd->local_dma_lkey;
947	tx_desc->num_sge = 2;
948	}
949	if (!login->login_failed) {
950	if (login->login_complete) {
951	ret = isert_alloc_rx_descriptors(isert_conn);
952	if (ret)
953	return ret;
954
955	ret = isert_post_recvm(isert_conn,
956	ISERT_QP_MAX_RECV_DTOS);
957	if (ret)
958	return ret;
959
960	/* Now we are in FULL_FEATURE phase */
961	mutex_lock(&isert_conn->mutex);
962	isert_conn->state = ISER_CONN_FULL_FEATURE;
963	mutex_unlock(lock: &isert_conn->mutex);
964	goto post_send;
965	}
966
967	ret = isert_login_post_recv(isert_conn);
968	if (ret)
969	return ret;
970	}
971	post_send:
972	ret = isert_login_post_send(isert_conn, tx_desc);
973	if (ret)
974	return ret;
975
976	return 0;
977	}
978
979	static void
980	isert_rx_login_req(struct isert_conn *isert_conn)
981	{
982	struct iser_rx_desc *rx_desc = isert_conn->login_desc;
983	int rx_buflen = isert_conn->login_req_len;
984	struct iscsit_conn *conn = isert_conn->conn;
985	struct iscsi_login *login = conn->conn_login;
986	int size;
987
988	isert_info("conn %p\n", isert_conn);
989
990	WARN_ON_ONCE(!login);
991
992	if (login->first_request) {
993	struct iscsi_login_req *login_req =
994	(struct iscsi_login_req *)isert_get_iscsi_hdr(desc: rx_desc);
995	/*
996	* Setup the initial iscsi_login values from the leading
997	* login request PDU.
998	*/
999	login->leading_connection = (!login_req->tsih) ? 1 : 0;
1000	login->current_stage = ISCSI_LOGIN_CURRENT_STAGE(
1001	login_req->flags);
1002	login->version_min = login_req->min_version;
1003	login->version_max = login_req->max_version;
1004	memcpy(login->isid, login_req->isid, 6);
1005	login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1006	login->init_task_tag = login_req->itt;
1007	login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1008	login->cid = be16_to_cpu(login_req->cid);
1009	login->tsih = be16_to_cpu(login_req->tsih);
1010	}
1011
1012	memcpy(&login->req[0], isert_get_iscsi_hdr(rx_desc), ISCSI_HDR_LEN);
1013
1014	size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1015	isert_dbg("Using login payload size: %d, rx_buflen: %d "
1016	"MAX_KEY_VALUE_PAIRS: %d\n", size, rx_buflen,
1017	MAX_KEY_VALUE_PAIRS);
1018	memcpy(login->req_buf, isert_get_data(rx_desc), size);
1019
1020	if (login->first_request) {
1021	complete(&isert_conn->login_comp);
1022	return;
1023	}
1024	queue_delayed_work(wq: isert_login_wq, dwork: &conn->login_work, delay: 0);
1025	}
1026
1027	static struct iscsit_cmd
1028	*isert_allocate_cmd(struct iscsit_conn *conn, struct iser_rx_desc *rx_desc)
1029	{
1030	struct isert_conn *isert_conn = conn->context;
1031	struct isert_cmd *isert_cmd;
1032	struct iscsit_cmd *cmd;
1033
1034	cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1035	if (!cmd) {
1036	isert_err("Unable to allocate iscsit_cmd + isert_cmd\n");
1037	return NULL;
1038	}
1039	isert_cmd = iscsit_priv_cmd(cmd);
1040	isert_cmd->conn = isert_conn;
1041	isert_cmd->iscsit_cmd = cmd;
1042	isert_cmd->rx_desc = rx_desc;
1043
1044	return cmd;
1045	}
1046
1047	static int
1048	isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1049	struct isert_cmd *isert_cmd, struct iscsit_cmd *cmd,
1050	struct iser_rx_desc *rx_desc, unsigned char *buf)
1051	{
1052	struct iscsit_conn *conn = isert_conn->conn;
1053	struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1054	int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1055	bool dump_payload = false;
1056	unsigned int data_len;
1057
1058	rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1059	if (rc < 0)
1060	return rc;
1061
1062	imm_data = cmd->immediate_data;
1063	imm_data_len = cmd->first_burst_len;
1064	unsol_data = cmd->unsolicited_data;
1065	data_len = cmd->se_cmd.data_length;
1066
1067	if (imm_data && imm_data_len == data_len)
1068	cmd->se_cmd.se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1069	rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1070	if (rc < 0) {
1071	return 0;
1072	} else if (rc > 0) {
1073	dump_payload = true;
1074	goto sequence_cmd;
1075	}
1076
1077	if (!imm_data)
1078	return 0;
1079
1080	if (imm_data_len != data_len) {
1081	sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1082	sg_copy_from_buffer(sgl: cmd->se_cmd.t_data_sg, nents: sg_nents,
1083	buf: isert_get_data(desc: rx_desc), buflen: imm_data_len);
1084	isert_dbg("Copy Immediate sg_nents: %u imm_data_len: %d\n",
1085	sg_nents, imm_data_len);
1086	} else {
1087	sg_init_table(&isert_cmd->sg, 1);
1088	cmd->se_cmd.t_data_sg = &isert_cmd->sg;
1089	cmd->se_cmd.t_data_nents = 1;
1090	sg_set_buf(sg: &isert_cmd->sg, buf: isert_get_data(desc: rx_desc),
1091	buflen: imm_data_len);
1092	isert_dbg("Transfer Immediate imm_data_len: %d\n",
1093	imm_data_len);
1094	}
1095
1096	cmd->write_data_done += imm_data_len;
1097
1098	if (cmd->write_data_done == cmd->se_cmd.data_length) {
1099	spin_lock_bh(lock: &cmd->istate_lock);
1100	cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1101	cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1102	spin_unlock_bh(lock: &cmd->istate_lock);
1103	}
1104
1105	sequence_cmd:
1106	rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1107
1108	if (!rc && !dump_payload && unsol_data)
1109	iscsit_set_unsolicited_dataout(cmd);
1110	else if (dump_payload && imm_data)
1111	target_put_sess_cmd(&cmd->se_cmd);
1112
1113	return 0;
1114	}
1115
1116	static int
1117	isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1118	struct iser_rx_desc *rx_desc, unsigned char *buf)
1119	{
1120	struct scatterlist *sg_start;
1121	struct iscsit_conn *conn = isert_conn->conn;
1122	struct iscsit_cmd *cmd = NULL;
1123	struct iscsi_data *hdr = (struct iscsi_data *)buf;
1124	u32 unsol_data_len = ntoh24(hdr->dlength);
1125	int rc, sg_nents, sg_off, page_off;
1126
1127	rc = iscsit_check_dataout_hdr(conn, buf, out_cmd: &cmd);
1128	if (rc < 0)
1129	return rc;
1130	else if (!cmd)
1131	return 0;
1132	/*
1133	* FIXME: Unexpected unsolicited_data out
1134	*/
1135	if (!cmd->unsolicited_data) {
1136	isert_err("Received unexpected solicited data payload\n");
1137	dump_stack();
1138	return -1;
1139	}
1140
1141	isert_dbg("Unsolicited DataOut unsol_data_len: %u, "
1142	"write_data_done: %u, data_length: %u\n",
1143	unsol_data_len, cmd->write_data_done,
1144	cmd->se_cmd.data_length);
1145
1146	sg_off = cmd->write_data_done / PAGE_SIZE;
1147	sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1148	sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1149	page_off = cmd->write_data_done % PAGE_SIZE;
1150	/*
1151	* FIXME: Non page-aligned unsolicited_data out
1152	*/
1153	if (page_off) {
1154	isert_err("unexpected non-page aligned data payload\n");
1155	dump_stack();
1156	return -1;
1157	}
1158	isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u "
1159	"sg_nents: %u from %p %u\n", sg_start, sg_off,
1160	sg_nents, isert_get_data(rx_desc), unsol_data_len);
1161
1162	sg_copy_from_buffer(sgl: sg_start, nents: sg_nents, buf: isert_get_data(desc: rx_desc),
1163	buflen: unsol_data_len);
1164
1165	rc = iscsit_check_dataout_payload(cmd, hdr, false);
1166	if (rc < 0)
1167	return rc;
1168
1169	/*
1170	* multiple data-outs on the same command can arrive -
1171	* so post the buffer before hand
1172	*/
1173	return isert_post_recv(isert_conn, rx_desc);
1174	}
1175
1176	static int
1177	isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1178	struct iscsit_cmd *cmd, struct iser_rx_desc *rx_desc,
1179	unsigned char *buf)
1180	{
1181	struct iscsit_conn *conn = isert_conn->conn;
1182	struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1183	int rc;
1184
1185	rc = iscsit_setup_nop_out(conn, cmd, hdr);
1186	if (rc < 0)
1187	return rc;
1188	/*
1189	* FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1190	*/
1191
1192	return iscsit_process_nop_out(conn, cmd, hdr);
1193	}
1194
1195	static int
1196	isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1197	struct iscsit_cmd *cmd, struct iser_rx_desc *rx_desc,
1198	struct iscsi_text *hdr)
1199	{
1200	struct iscsit_conn *conn = isert_conn->conn;
1201	u32 payload_length = ntoh24(hdr->dlength);
1202	int rc;
1203	unsigned char *text_in = NULL;
1204
1205	rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1206	if (rc < 0)
1207	return rc;
1208
1209	if (payload_length) {
1210	text_in = kzalloc(size: payload_length, GFP_KERNEL);
1211	if (!text_in)
1212	return -ENOMEM;
1213	}
1214	cmd->text_in_ptr = text_in;
1215
1216	memcpy(cmd->text_in_ptr, isert_get_data(rx_desc), payload_length);
1217
1218	return iscsit_process_text_cmd(conn, cmd, hdr);
1219	}
1220
1221	static int
1222	isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1223	uint32_t read_stag, uint64_t read_va,
1224	uint32_t write_stag, uint64_t write_va)
1225	{
1226	struct iscsi_hdr *hdr = isert_get_iscsi_hdr(desc: rx_desc);
1227	struct iscsit_conn *conn = isert_conn->conn;
1228	struct iscsit_cmd *cmd;
1229	struct isert_cmd *isert_cmd;
1230	int ret = -EINVAL;
1231	u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1232
1233	if (conn->sess->sess_ops->SessionType &&
1234	(!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1235	isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1236	" ignoring\n", opcode);
1237	return 0;
1238	}
1239
1240	switch (opcode) {
1241	case ISCSI_OP_SCSI_CMD:
1242	cmd = isert_allocate_cmd(conn, rx_desc);
1243	if (!cmd)
1244	break;
1245
1246	isert_cmd = iscsit_priv_cmd(cmd);
1247	isert_cmd->read_stag = read_stag;
1248	isert_cmd->read_va = read_va;
1249	isert_cmd->write_stag = write_stag;
1250	isert_cmd->write_va = write_va;
1251	isert_cmd->inv_rkey = read_stag ? read_stag : write_stag;
1252
1253	ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1254	rx_desc, buf: (unsigned char *)hdr);
1255	break;
1256	case ISCSI_OP_NOOP_OUT:
1257	cmd = isert_allocate_cmd(conn, rx_desc);
1258	if (!cmd)
1259	break;
1260
1261	isert_cmd = iscsit_priv_cmd(cmd);
1262	ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1263	rx_desc, buf: (unsigned char *)hdr);
1264	break;
1265	case ISCSI_OP_SCSI_DATA_OUT:
1266	ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1267	buf: (unsigned char *)hdr);
1268	break;
1269	case ISCSI_OP_SCSI_TMFUNC:
1270	cmd = isert_allocate_cmd(conn, rx_desc);
1271	if (!cmd)
1272	break;
1273
1274	ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1275	(unsigned char *)hdr);
1276	break;
1277	case ISCSI_OP_LOGOUT:
1278	cmd = isert_allocate_cmd(conn, rx_desc);
1279	if (!cmd)
1280	break;
1281
1282	ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1283	break;
1284	case ISCSI_OP_TEXT:
1285	if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF)
1286	cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
1287	else
1288	cmd = isert_allocate_cmd(conn, rx_desc);
1289
1290	if (!cmd)
1291	break;
1292
1293	isert_cmd = iscsit_priv_cmd(cmd);
1294	ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1295	rx_desc, hdr: (struct iscsi_text *)hdr);
1296	break;
1297	default:
1298	isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1299	dump_stack();
1300	break;
1301	}
1302
1303	return ret;
1304	}
1305
1306	static void
1307	isert_print_wc(struct ib_wc *wc, const char *type)
1308	{
1309	if (wc->status != IB_WC_WR_FLUSH_ERR)
1310	isert_err("%s failure: %s (%d) vend_err %x\n", type,
1311	ib_wc_status_msg(wc->status), wc->status,
1312	wc->vendor_err);
1313	else
1314	isert_dbg("%s failure: %s (%d)\n", type,
1315	ib_wc_status_msg(wc->status), wc->status);
1316	}
1317
1318	static void
1319	isert_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1320	{
1321	struct isert_conn *isert_conn = wc->qp->qp_context;
1322	struct ib_device *ib_dev = isert_conn->cm_id->device;
1323	struct iser_rx_desc *rx_desc = cqe_to_rx_desc(cqe: wc->wr_cqe);
1324	struct iscsi_hdr *hdr = isert_get_iscsi_hdr(desc: rx_desc);
1325	struct iser_ctrl *iser_ctrl = isert_get_iser_hdr(desc: rx_desc);
1326	uint64_t read_va = 0, write_va = 0;
1327	uint32_t read_stag = 0, write_stag = 0;
1328
1329	if (unlikely(wc->status != IB_WC_SUCCESS)) {
1330	isert_print_wc(wc, type: "recv");
1331	if (wc->status != IB_WC_WR_FLUSH_ERR)
1332	iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1333	return;
1334	}
1335
1336	rx_desc->in_use = true;
1337
1338	ib_dma_sync_single_for_cpu(dev: ib_dev, addr: rx_desc->dma_addr,
1339	ISER_RX_SIZE, dir: DMA_FROM_DEVICE);
1340
1341	isert_dbg("DMA: 0x%llx, iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1342	rx_desc->dma_addr, hdr->opcode, hdr->itt, hdr->flags,
1343	(int)(wc->byte_len - ISER_HEADERS_LEN));
1344
1345	switch (iser_ctrl->flags & 0xF0) {
1346	case ISCSI_CTRL:
1347	if (iser_ctrl->flags & ISER_RSV) {
1348	read_stag = be32_to_cpu(iser_ctrl->read_stag);
1349	read_va = be64_to_cpu(iser_ctrl->read_va);
1350	isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n",
1351	read_stag, (unsigned long long)read_va);
1352	}
1353	if (iser_ctrl->flags & ISER_WSV) {
1354	write_stag = be32_to_cpu(iser_ctrl->write_stag);
1355	write_va = be64_to_cpu(iser_ctrl->write_va);
1356	isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n",
1357	write_stag, (unsigned long long)write_va);
1358	}
1359
1360	isert_dbg("ISER ISCSI_CTRL PDU\n");
1361	break;
1362	case ISER_HELLO:
1363	isert_err("iSER Hello message\n");
1364	break;
1365	default:
1366	isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_ctrl->flags);
1367	break;
1368	}
1369
1370	isert_rx_opcode(isert_conn, rx_desc,
1371	read_stag, read_va, write_stag, write_va);
1372
1373	ib_dma_sync_single_for_device(dev: ib_dev, addr: rx_desc->dma_addr,
1374	ISER_RX_SIZE, dir: DMA_FROM_DEVICE);
1375	}
1376
1377	static void
1378	isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1379	{
1380	struct isert_conn *isert_conn = wc->qp->qp_context;
1381	struct ib_device *ib_dev = isert_conn->device->ib_device;
1382
1383	if (unlikely(wc->status != IB_WC_SUCCESS)) {
1384	isert_print_wc(wc, type: "login recv");
1385	return;
1386	}
1387
1388	ib_dma_sync_single_for_cpu(dev: ib_dev, addr: isert_conn->login_desc->dma_addr,
1389	ISER_RX_SIZE, dir: DMA_FROM_DEVICE);
1390
1391	isert_conn->login_req_len = wc->byte_len - ISER_HEADERS_LEN;
1392
1393	if (isert_conn->conn) {
1394	struct iscsi_login *login = isert_conn->conn->conn_login;
1395
1396	if (login && !login->first_request)
1397	isert_rx_login_req(isert_conn);
1398	}
1399
1400	mutex_lock(&isert_conn->mutex);
1401	complete(&isert_conn->login_req_comp);
1402	mutex_unlock(lock: &isert_conn->mutex);
1403
1404	ib_dma_sync_single_for_device(dev: ib_dev, addr: isert_conn->login_desc->dma_addr,
1405	ISER_RX_SIZE, dir: DMA_FROM_DEVICE);
1406	}
1407
1408	static void
1409	isert_rdma_rw_ctx_destroy(struct isert_cmd *cmd, struct isert_conn *conn)
1410	{
1411	struct se_cmd *se_cmd = &cmd->iscsit_cmd->se_cmd;
1412	enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
1413
1414	if (!cmd->rw.nr_ops)
1415	return;
1416
1417	if (isert_prot_cmd(conn, cmd: se_cmd)) {
1418	rdma_rw_ctx_destroy_signature(ctx: &cmd->rw, qp: conn->qp,
1419	port_num: conn->cm_id->port_num, sg: se_cmd->t_data_sg,
1420	sg_cnt: se_cmd->t_data_nents, prot_sg: se_cmd->t_prot_sg,
1421	prot_sg_cnt: se_cmd->t_prot_nents, dir);
1422	} else {
1423	rdma_rw_ctx_destroy(ctx: &cmd->rw, qp: conn->qp, port_num: conn->cm_id->port_num,
1424	sg: se_cmd->t_data_sg, sg_cnt: se_cmd->t_data_nents, dir);
1425	}
1426
1427	cmd->rw.nr_ops = 0;
1428	}
1429
1430	static void
1431	isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1432	{
1433	struct iscsit_cmd *cmd = isert_cmd->iscsit_cmd;
1434	struct isert_conn *isert_conn = isert_cmd->conn;
1435	struct iscsit_conn *conn = isert_conn->conn;
1436	struct iscsi_text_rsp *hdr;
1437
1438	isert_dbg("Cmd %p\n", isert_cmd);
1439
1440	switch (cmd->iscsi_opcode) {
1441	case ISCSI_OP_SCSI_CMD:
1442	spin_lock_bh(lock: &conn->cmd_lock);
1443	if (!list_empty(head: &cmd->i_conn_node))
1444	list_del_init(entry: &cmd->i_conn_node);
1445	spin_unlock_bh(lock: &conn->cmd_lock);
1446
1447	if (cmd->data_direction == DMA_TO_DEVICE) {
1448	iscsit_stop_dataout_timer(cmd);
1449	/*
1450	* Check for special case during comp_err where
1451	* WRITE_PENDING has been handed off from core,
1452	* but requires an extra target_put_sess_cmd()
1453	* before transport_generic_free_cmd() below.
1454	*/
1455	if (comp_err &&
1456	cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1457	struct se_cmd *se_cmd = &cmd->se_cmd;
1458
1459	target_put_sess_cmd(se_cmd);
1460	}
1461	}
1462
1463	isert_rdma_rw_ctx_destroy(cmd: isert_cmd, conn: isert_conn);
1464	transport_generic_free_cmd(&cmd->se_cmd, 0);
1465	break;
1466	case ISCSI_OP_SCSI_TMFUNC:
1467	spin_lock_bh(lock: &conn->cmd_lock);
1468	if (!list_empty(head: &cmd->i_conn_node))
1469	list_del_init(entry: &cmd->i_conn_node);
1470	spin_unlock_bh(lock: &conn->cmd_lock);
1471
1472	transport_generic_free_cmd(&cmd->se_cmd, 0);
1473	break;
1474	case ISCSI_OP_REJECT:
1475	case ISCSI_OP_NOOP_OUT:
1476	case ISCSI_OP_TEXT:
1477	hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1478	/* If the continue bit is on, keep the command alive */
1479	if (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)
1480	break;
1481
1482	spin_lock_bh(lock: &conn->cmd_lock);
1483	if (!list_empty(head: &cmd->i_conn_node))
1484	list_del_init(entry: &cmd->i_conn_node);
1485	spin_unlock_bh(lock: &conn->cmd_lock);
1486
1487	/*
1488	* Handle special case for REJECT when iscsi_add_reject*() has
1489	* overwritten the original iscsi_opcode assignment, and the
1490	* associated cmd->se_cmd needs to be released.
1491	*/
1492	if (cmd->se_cmd.se_tfo != NULL) {
1493	isert_dbg("Calling transport_generic_free_cmd for 0x%02x\n",
1494	cmd->iscsi_opcode);
1495	transport_generic_free_cmd(&cmd->se_cmd, 0);
1496	break;
1497	}
1498	fallthrough;
1499	default:
1500	iscsit_release_cmd(cmd);
1501	break;
1502	}
1503	}
1504
1505	static void
1506	isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1507	{
1508	if (tx_desc->dma_addr != 0) {
1509	isert_dbg("unmap single for tx_desc->dma_addr\n");
1510	ib_dma_unmap_single(dev: ib_dev, addr: tx_desc->dma_addr,
1511	ISER_HEADERS_LEN, direction: DMA_TO_DEVICE);
1512	tx_desc->dma_addr = 0;
1513	}
1514	}
1515
1516	static void
1517	isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1518	struct ib_device *ib_dev, bool comp_err)
1519	{
1520	if (isert_cmd->pdu_buf_dma != 0) {
1521	isert_dbg("unmap single for isert_cmd->pdu_buf_dma\n");
1522	ib_dma_unmap_single(dev: ib_dev, addr: isert_cmd->pdu_buf_dma,
1523	size: isert_cmd->pdu_buf_len, direction: DMA_TO_DEVICE);
1524	isert_cmd->pdu_buf_dma = 0;
1525	}
1526
1527	isert_unmap_tx_desc(tx_desc, ib_dev);
1528	isert_put_cmd(isert_cmd, comp_err);
1529	}
1530
1531	static int
1532	isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1533	{
1534	struct ib_mr_status mr_status;
1535	int ret;
1536
1537	ret = ib_check_mr_status(mr: sig_mr, check_mask: IB_MR_CHECK_SIG_STATUS, mr_status: &mr_status);
1538	if (ret) {
1539	isert_err("ib_check_mr_status failed, ret %d\n", ret);
1540	goto fail_mr_status;
1541	}
1542
1543	if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1544	u64 sec_offset_err;
1545	u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1546
1547	switch (mr_status.sig_err.err_type) {
1548	case IB_SIG_BAD_GUARD:
1549	se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1550	break;
1551	case IB_SIG_BAD_REFTAG:
1552	se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1553	break;
1554	case IB_SIG_BAD_APPTAG:
1555	se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1556	break;
1557	}
1558	sec_offset_err = mr_status.sig_err.sig_err_offset;
1559	do_div(sec_offset_err, block_size);
1560	se_cmd->sense_info = sec_offset_err + se_cmd->t_task_lba;
1561
1562	isert_err("PI error found type %d at sector 0x%llx "
1563	"expected 0x%x vs actual 0x%x\n",
1564	mr_status.sig_err.err_type,
1565	(unsigned long long)se_cmd->sense_info,
1566	mr_status.sig_err.expected,
1567	mr_status.sig_err.actual);
1568	ret = 1;
1569	}
1570
1571	fail_mr_status:
1572	return ret;
1573	}
1574
1575	static void
1576	isert_rdma_write_done(struct ib_cq *cq, struct ib_wc *wc)
1577	{
1578	struct isert_conn *isert_conn = wc->qp->qp_context;
1579	struct isert_device *device = isert_conn->device;
1580	struct iser_tx_desc *desc = cqe_to_tx_desc(cqe: wc->wr_cqe);
1581	struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1582	struct se_cmd *cmd = &isert_cmd->iscsit_cmd->se_cmd;
1583	int ret = 0;
1584
1585	if (unlikely(wc->status != IB_WC_SUCCESS)) {
1586	isert_print_wc(wc, type: "rdma write");
1587	if (wc->status != IB_WC_WR_FLUSH_ERR)
1588	iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1589	isert_completion_put(tx_desc: desc, isert_cmd, ib_dev: device->ib_device, comp_err: true);
1590	return;
1591	}
1592
1593	isert_dbg("Cmd %p\n", isert_cmd);
1594
1595	ret = isert_check_pi_status(se_cmd: cmd, sig_mr: isert_cmd->rw.reg->mr);
1596	isert_rdma_rw_ctx_destroy(cmd: isert_cmd, conn: isert_conn);
1597
1598	if (ret) {
1599	/*
1600	* transport_generic_request_failure() expects to have
1601	* plus two references to handle queue-full, so re-add
1602	* one here as target-core will have already dropped
1603	* it after the first isert_put_datain() callback.
1604	*/
1605	kref_get(kref: &cmd->cmd_kref);
1606	transport_generic_request_failure(cmd, cmd->pi_err);
1607	} else {
1608	/*
1609	* XXX: isert_put_response() failure is not retried.
1610	*/
1611	ret = isert_put_response(conn: isert_conn->conn, cmd: isert_cmd->iscsit_cmd);
1612	if (ret)
1613	pr_warn_ratelimited("isert_put_response() ret: %d\n", ret);
1614	}
1615	}
1616
1617	static void
1618	isert_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc)
1619	{
1620	struct isert_conn *isert_conn = wc->qp->qp_context;
1621	struct isert_device *device = isert_conn->device;
1622	struct iser_tx_desc *desc = cqe_to_tx_desc(cqe: wc->wr_cqe);
1623	struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1624	struct iscsit_cmd *cmd = isert_cmd->iscsit_cmd;
1625	struct se_cmd *se_cmd = &cmd->se_cmd;
1626	int ret = 0;
1627
1628	if (unlikely(wc->status != IB_WC_SUCCESS)) {
1629	isert_print_wc(wc, type: "rdma read");
1630	if (wc->status != IB_WC_WR_FLUSH_ERR)
1631	iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1632	isert_completion_put(tx_desc: desc, isert_cmd, ib_dev: device->ib_device, comp_err: true);
1633	return;
1634	}
1635
1636	isert_dbg("Cmd %p\n", isert_cmd);
1637
1638	iscsit_stop_dataout_timer(cmd);
1639
1640	if (isert_prot_cmd(conn: isert_conn, cmd: se_cmd))
1641	ret = isert_check_pi_status(se_cmd, sig_mr: isert_cmd->rw.reg->mr);
1642	isert_rdma_rw_ctx_destroy(cmd: isert_cmd, conn: isert_conn);
1643	cmd->write_data_done = 0;
1644
1645	isert_dbg("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1646	spin_lock_bh(lock: &cmd->istate_lock);
1647	cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1648	cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1649	spin_unlock_bh(lock: &cmd->istate_lock);
1650
1651	/*
1652	* transport_generic_request_failure() will drop the extra
1653	* se_cmd->cmd_kref reference after T10-PI error, and handle
1654	* any non-zero ->queue_status() callback error retries.
1655	*/
1656	if (ret)
1657	transport_generic_request_failure(se_cmd, se_cmd->pi_err);
1658	else
1659	target_execute_cmd(cmd: se_cmd);
1660	}
1661
1662	static void
1663	isert_do_control_comp(struct work_struct *work)
1664	{
1665	struct isert_cmd *isert_cmd = container_of(work,
1666	struct isert_cmd, comp_work);
1667	struct isert_conn *isert_conn = isert_cmd->conn;
1668	struct ib_device *ib_dev = isert_conn->cm_id->device;
1669	struct iscsit_cmd *cmd = isert_cmd->iscsit_cmd;
1670
1671	isert_dbg("Cmd %p i_state %d\n", isert_cmd, cmd->i_state);
1672
1673	switch (cmd->i_state) {
1674	case ISTATE_SEND_TASKMGTRSP:
1675	iscsit_tmr_post_handler(cmd, cmd->conn);
1676	fallthrough;
1677	case ISTATE_SEND_REJECT:
1678	case ISTATE_SEND_TEXTRSP:
1679	cmd->i_state = ISTATE_SENT_STATUS;
1680	isert_completion_put(tx_desc: &isert_cmd->tx_desc, isert_cmd,
1681	ib_dev, comp_err: false);
1682	break;
1683	case ISTATE_SEND_LOGOUTRSP:
1684	iscsit_logout_post_handler(cmd, cmd->conn);
1685	break;
1686	default:
1687	isert_err("Unknown i_state %d\n", cmd->i_state);
1688	dump_stack();
1689	break;
1690	}
1691	}
1692
1693	static void
1694	isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc)
1695	{
1696	struct isert_conn *isert_conn = wc->qp->qp_context;
1697	struct ib_device *ib_dev = isert_conn->cm_id->device;
1698	struct iser_tx_desc *tx_desc = cqe_to_tx_desc(cqe: wc->wr_cqe);
1699
1700	if (unlikely(wc->status != IB_WC_SUCCESS)) {
1701	isert_print_wc(wc, type: "login send");
1702	if (wc->status != IB_WC_WR_FLUSH_ERR)
1703	iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1704	}
1705
1706	isert_unmap_tx_desc(tx_desc, ib_dev);
1707	}
1708
1709	static void
1710	isert_send_done(struct ib_cq *cq, struct ib_wc *wc)
1711	{
1712	struct isert_conn *isert_conn = wc->qp->qp_context;
1713	struct ib_device *ib_dev = isert_conn->cm_id->device;
1714	struct iser_tx_desc *tx_desc = cqe_to_tx_desc(cqe: wc->wr_cqe);
1715	struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc: tx_desc);
1716
1717	if (unlikely(wc->status != IB_WC_SUCCESS)) {
1718	isert_print_wc(wc, type: "send");
1719	if (wc->status != IB_WC_WR_FLUSH_ERR)
1720	iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1721	isert_completion_put(tx_desc, isert_cmd, ib_dev, comp_err: true);
1722	return;
1723	}
1724
1725	isert_dbg("Cmd %p\n", isert_cmd);
1726
1727	switch (isert_cmd->iscsit_cmd->i_state) {
1728	case ISTATE_SEND_TASKMGTRSP:
1729	case ISTATE_SEND_LOGOUTRSP:
1730	case ISTATE_SEND_REJECT:
1731	case ISTATE_SEND_TEXTRSP:
1732	isert_unmap_tx_desc(tx_desc, ib_dev);
1733
1734	INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1735	queue_work(wq: isert_comp_wq, work: &isert_cmd->comp_work);
1736	return;
1737	default:
1738	isert_cmd->iscsit_cmd->i_state = ISTATE_SENT_STATUS;
1739	isert_completion_put(tx_desc, isert_cmd, ib_dev, comp_err: false);
1740	break;
1741	}
1742	}
1743
1744	static int
1745	isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
1746	{
1747	int ret;
1748
1749	ret = isert_post_recv(isert_conn, rx_desc: isert_cmd->rx_desc);
1750	if (ret)
1751	return ret;
1752
1753	ret = ib_post_send(qp: isert_conn->qp, send_wr: &isert_cmd->tx_desc.send_wr, NULL);
1754	if (ret) {
1755	isert_err("ib_post_send failed with %d\n", ret);
1756	return ret;
1757	}
1758	return ret;
1759	}
1760
1761	static int
1762	isert_put_response(struct iscsit_conn *conn, struct iscsit_cmd *cmd)
1763	{
1764	struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1765	struct isert_conn *isert_conn = conn->context;
1766	struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1767	struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
1768	&isert_cmd->tx_desc.iscsi_header;
1769
1770	isert_create_send_desc(isert_conn, isert_cmd, tx_desc: &isert_cmd->tx_desc);
1771	iscsit_build_rsp_pdu(cmd, conn, true, hdr);
1772	isert_init_tx_hdrs(isert_conn, tx_desc: &isert_cmd->tx_desc);
1773	/*
1774	* Attach SENSE DATA payload to iSCSI Response PDU
1775	*/
1776	if (cmd->se_cmd.sense_buffer &&
1777	((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
1778	(cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
1779	struct isert_device *device = isert_conn->device;
1780	struct ib_device *ib_dev = device->ib_device;
1781	struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1782	u32 padding, pdu_len;
1783
1784	put_unaligned_be16(val: cmd->se_cmd.scsi_sense_length,
1785	p: cmd->sense_buffer);
1786	cmd->se_cmd.scsi_sense_length += sizeof(__be16);
1787
1788	padding = -(cmd->se_cmd.scsi_sense_length) & 3;
1789	hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
1790	pdu_len = cmd->se_cmd.scsi_sense_length + padding;
1791
1792	isert_cmd->pdu_buf_dma = ib_dma_map_single(dev: ib_dev,
1793	cpu_addr: (void *)cmd->sense_buffer, size: pdu_len,
1794	direction: DMA_TO_DEVICE);
1795	if (ib_dma_mapping_error(dev: ib_dev, dma_addr: isert_cmd->pdu_buf_dma))
1796	return -ENOMEM;
1797
1798	isert_cmd->pdu_buf_len = pdu_len;
1799	tx_dsg->addr = isert_cmd->pdu_buf_dma;
1800	tx_dsg->length = pdu_len;
1801	tx_dsg->lkey = device->pd->local_dma_lkey;
1802	isert_cmd->tx_desc.num_sge = 2;
1803	}
1804
1805	isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1806
1807	isert_dbg("Posting SCSI Response\n");
1808
1809	return isert_post_response(isert_conn, isert_cmd);
1810	}
1811
1812	static void
1813	isert_aborted_task(struct iscsit_conn *conn, struct iscsit_cmd *cmd)
1814	{
1815	struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1816	struct isert_conn *isert_conn = conn->context;
1817
1818	spin_lock_bh(lock: &conn->cmd_lock);
1819	if (!list_empty(head: &cmd->i_conn_node))
1820	list_del_init(entry: &cmd->i_conn_node);
1821	spin_unlock_bh(lock: &conn->cmd_lock);
1822
1823	if (cmd->data_direction == DMA_TO_DEVICE)
1824	iscsit_stop_dataout_timer(cmd);
1825	isert_rdma_rw_ctx_destroy(cmd: isert_cmd, conn: isert_conn);
1826	}
1827
1828	static enum target_prot_op
1829	isert_get_sup_prot_ops(struct iscsit_conn *conn)
1830	{
1831	struct isert_conn *isert_conn = conn->context;
1832	struct isert_device *device = isert_conn->device;
1833
1834	if (conn->tpg->tpg_attrib.t10_pi) {
1835	if (device->pi_capable) {
1836	isert_info("conn %p PI offload enabled\n", isert_conn);
1837	isert_conn->pi_support = true;
1838	return TARGET_PROT_ALL;
1839	}
1840	}
1841
1842	isert_info("conn %p PI offload disabled\n", isert_conn);
1843	isert_conn->pi_support = false;
1844
1845	return TARGET_PROT_NORMAL;
1846	}
1847
1848	static int
1849	isert_put_nopin(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
1850	bool nopout_response)
1851	{
1852	struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1853	struct isert_conn *isert_conn = conn->context;
1854	struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1855
1856	isert_create_send_desc(isert_conn, isert_cmd, tx_desc: &isert_cmd->tx_desc);
1857	iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
1858	&isert_cmd->tx_desc.iscsi_header,
1859	nopout_response);
1860	isert_init_tx_hdrs(isert_conn, tx_desc: &isert_cmd->tx_desc);
1861	isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1862
1863	isert_dbg("conn %p Posting NOPIN Response\n", isert_conn);
1864
1865	return isert_post_response(isert_conn, isert_cmd);
1866	}
1867
1868	static int
1869	isert_put_logout_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
1870	{
1871	struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1872	struct isert_conn *isert_conn = conn->context;
1873	struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1874
1875	isert_create_send_desc(isert_conn, isert_cmd, tx_desc: &isert_cmd->tx_desc);
1876	iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
1877	&isert_cmd->tx_desc.iscsi_header);
1878	isert_init_tx_hdrs(isert_conn, tx_desc: &isert_cmd->tx_desc);
1879	isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1880
1881	isert_dbg("conn %p Posting Logout Response\n", isert_conn);
1882
1883	return isert_post_response(isert_conn, isert_cmd);
1884	}
1885
1886	static int
1887	isert_put_tm_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
1888	{
1889	struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1890	struct isert_conn *isert_conn = conn->context;
1891	struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1892
1893	isert_create_send_desc(isert_conn, isert_cmd, tx_desc: &isert_cmd->tx_desc);
1894	iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
1895	&isert_cmd->tx_desc.iscsi_header);
1896	isert_init_tx_hdrs(isert_conn, tx_desc: &isert_cmd->tx_desc);
1897	isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1898
1899	isert_dbg("conn %p Posting Task Management Response\n", isert_conn);
1900
1901	return isert_post_response(isert_conn, isert_cmd);
1902	}
1903
1904	static int
1905	isert_put_reject(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
1906	{
1907	struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1908	struct isert_conn *isert_conn = conn->context;
1909	struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1910	struct isert_device *device = isert_conn->device;
1911	struct ib_device *ib_dev = device->ib_device;
1912	struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1913	struct iscsi_reject *hdr =
1914	(struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
1915
1916	isert_create_send_desc(isert_conn, isert_cmd, tx_desc: &isert_cmd->tx_desc);
1917	iscsit_build_reject(cmd, conn, hdr);
1918	isert_init_tx_hdrs(isert_conn, tx_desc: &isert_cmd->tx_desc);
1919
1920	hton24(hdr->dlength, ISCSI_HDR_LEN);
1921	isert_cmd->pdu_buf_dma = ib_dma_map_single(dev: ib_dev,
1922	cpu_addr: (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
1923	direction: DMA_TO_DEVICE);
1924	if (ib_dma_mapping_error(dev: ib_dev, dma_addr: isert_cmd->pdu_buf_dma))
1925	return -ENOMEM;
1926	isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
1927	tx_dsg->addr = isert_cmd->pdu_buf_dma;
1928	tx_dsg->length = ISCSI_HDR_LEN;
1929	tx_dsg->lkey = device->pd->local_dma_lkey;
1930	isert_cmd->tx_desc.num_sge = 2;
1931
1932	isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1933
1934	isert_dbg("conn %p Posting Reject\n", isert_conn);
1935
1936	return isert_post_response(isert_conn, isert_cmd);
1937	}
1938
1939	static int
1940	isert_put_text_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
1941	{
1942	struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1943	struct isert_conn *isert_conn = conn->context;
1944	struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1945	struct iscsi_text_rsp *hdr =
1946	(struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1947	u32 txt_rsp_len;
1948	int rc;
1949
1950	isert_create_send_desc(isert_conn, isert_cmd, tx_desc: &isert_cmd->tx_desc);
1951	rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
1952	if (rc < 0)
1953	return rc;
1954
1955	txt_rsp_len = rc;
1956	isert_init_tx_hdrs(isert_conn, tx_desc: &isert_cmd->tx_desc);
1957
1958	if (txt_rsp_len) {
1959	struct isert_device *device = isert_conn->device;
1960	struct ib_device *ib_dev = device->ib_device;
1961	struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1962	void *txt_rsp_buf = cmd->buf_ptr;
1963
1964	isert_cmd->pdu_buf_dma = ib_dma_map_single(dev: ib_dev,
1965	cpu_addr: txt_rsp_buf, size: txt_rsp_len, direction: DMA_TO_DEVICE);
1966	if (ib_dma_mapping_error(dev: ib_dev, dma_addr: isert_cmd->pdu_buf_dma))
1967	return -ENOMEM;
1968
1969	isert_cmd->pdu_buf_len = txt_rsp_len;
1970	tx_dsg->addr = isert_cmd->pdu_buf_dma;
1971	tx_dsg->length = txt_rsp_len;
1972	tx_dsg->lkey = device->pd->local_dma_lkey;
1973	isert_cmd->tx_desc.num_sge = 2;
1974	}
1975	isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1976
1977	isert_dbg("conn %p Text Response\n", isert_conn);
1978
1979	return isert_post_response(isert_conn, isert_cmd);
1980	}
1981
1982	static inline void
1983	isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_domain *domain)
1984	{
1985	domain->sig_type = IB_SIG_TYPE_T10_DIF;
1986	domain->sig.dif.bg_type = IB_T10DIF_CRC;
1987	domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
1988	domain->sig.dif.ref_tag = se_cmd->reftag_seed;
1989	/*
1990	* At the moment we hard code those, but if in the future
1991	* the target core would like to use it, we will take it
1992	* from se_cmd.
1993	*/
1994	domain->sig.dif.apptag_check_mask = 0xffff;
1995	domain->sig.dif.app_escape = true;
1996	domain->sig.dif.ref_escape = true;
1997	if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
1998	se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
1999	domain->sig.dif.ref_remap = true;
2000	}
2001
2002	static int
2003	isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2004	{
2005	memset(sig_attrs, 0, sizeof(*sig_attrs));
2006
2007	switch (se_cmd->prot_op) {
2008	case TARGET_PROT_DIN_INSERT:
2009	case TARGET_PROT_DOUT_STRIP:
2010	sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
2011	isert_set_dif_domain(se_cmd, domain: &sig_attrs->wire);
2012	break;
2013	case TARGET_PROT_DOUT_INSERT:
2014	case TARGET_PROT_DIN_STRIP:
2015	sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
2016	isert_set_dif_domain(se_cmd, domain: &sig_attrs->mem);
2017	break;
2018	case TARGET_PROT_DIN_PASS:
2019	case TARGET_PROT_DOUT_PASS:
2020	isert_set_dif_domain(se_cmd, domain: &sig_attrs->wire);
2021	isert_set_dif_domain(se_cmd, domain: &sig_attrs->mem);
2022	break;
2023	default:
2024	isert_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2025	return -EINVAL;
2026	}
2027
2028	if (se_cmd->prot_checks & TARGET_DIF_CHECK_GUARD)
2029	sig_attrs->check_mask |= IB_SIG_CHECK_GUARD;
2030	if (se_cmd->prot_checks & TARGET_DIF_CHECK_APPTAG)
2031	sig_attrs->check_mask |= IB_SIG_CHECK_APPTAG;
2032	if (se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG)
2033	sig_attrs->check_mask |= IB_SIG_CHECK_REFTAG;
2034
2035	return 0;
2036	}
2037
2038	static int
2039	isert_rdma_rw_ctx_post(struct isert_cmd *cmd, struct isert_conn *conn,
2040	struct ib_cqe *cqe, struct ib_send_wr *chain_wr)
2041	{
2042	struct se_cmd *se_cmd = &cmd->iscsit_cmd->se_cmd;
2043	enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
2044	u8 port_num = conn->cm_id->port_num;
2045	u64 addr;
2046	u32 rkey, offset;
2047	int ret;
2048
2049	if (cmd->ctx_init_done)
2050	goto rdma_ctx_post;
2051
2052	if (dir == DMA_FROM_DEVICE) {
2053	addr = cmd->write_va;
2054	rkey = cmd->write_stag;
2055	offset = cmd->iscsit_cmd->write_data_done;
2056	} else {
2057	addr = cmd->read_va;
2058	rkey = cmd->read_stag;
2059	offset = 0;
2060	}
2061
2062	if (isert_prot_cmd(conn, cmd: se_cmd)) {
2063	struct ib_sig_attrs sig_attrs;
2064
2065	ret = isert_set_sig_attrs(se_cmd, sig_attrs: &sig_attrs);
2066	if (ret)
2067	return ret;
2068
2069	WARN_ON_ONCE(offset);
2070	ret = rdma_rw_ctx_signature_init(ctx: &cmd->rw, qp: conn->qp, port_num,
2071	sg: se_cmd->t_data_sg, sg_cnt: se_cmd->t_data_nents,
2072	prot_sg: se_cmd->t_prot_sg, prot_sg_cnt: se_cmd->t_prot_nents,
2073	sig_attrs: &sig_attrs, remote_addr: addr, rkey, dir);
2074	} else {
2075	ret = rdma_rw_ctx_init(ctx: &cmd->rw, qp: conn->qp, port_num,
2076	sg: se_cmd->t_data_sg, sg_cnt: se_cmd->t_data_nents,
2077	sg_offset: offset, remote_addr: addr, rkey, dir);
2078	}
2079
2080	if (ret < 0) {
2081	isert_err("Cmd: %p failed to prepare RDMA res\n", cmd);
2082	return ret;
2083	}
2084
2085	cmd->ctx_init_done = true;
2086
2087	rdma_ctx_post:
2088	ret = rdma_rw_ctx_post(ctx: &cmd->rw, qp: conn->qp, port_num, cqe, chain_wr);
2089	if (ret < 0)
2090	isert_err("Cmd: %p failed to post RDMA res\n", cmd);
2091	return ret;
2092	}
2093
2094	static int
2095	isert_put_datain(struct iscsit_conn *conn, struct iscsit_cmd *cmd)
2096	{
2097	struct se_cmd *se_cmd = &cmd->se_cmd;
2098	struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2099	struct isert_conn *isert_conn = conn->context;
2100	struct ib_cqe *cqe = NULL;
2101	struct ib_send_wr *chain_wr = NULL;
2102	int rc;
2103
2104	isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n",
2105	isert_cmd, se_cmd->data_length);
2106
2107	if (isert_prot_cmd(conn: isert_conn, cmd: se_cmd)) {
2108	isert_cmd->tx_desc.tx_cqe.done = isert_rdma_write_done;
2109	cqe = &isert_cmd->tx_desc.tx_cqe;
2110	} else {
2111	/*
2112	* Build isert_conn->tx_desc for iSCSI response PDU and attach
2113	*/
2114	isert_create_send_desc(isert_conn, isert_cmd,
2115	tx_desc: &isert_cmd->tx_desc);
2116	iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2117	&isert_cmd->tx_desc.iscsi_header);
2118	isert_init_tx_hdrs(isert_conn, tx_desc: &isert_cmd->tx_desc);
2119	isert_init_send_wr(isert_conn, isert_cmd,
2120	send_wr: &isert_cmd->tx_desc.send_wr);
2121
2122	rc = isert_post_recv(isert_conn, rx_desc: isert_cmd->rx_desc);
2123	if (rc)
2124	return rc;
2125
2126	chain_wr = &isert_cmd->tx_desc.send_wr;
2127	}
2128
2129	rc = isert_rdma_rw_ctx_post(cmd: isert_cmd, conn: isert_conn, cqe, chain_wr);
2130	isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ rc: %d\n",
2131	isert_cmd, rc);
2132	return rc;
2133	}
2134
2135	static int
2136	isert_get_dataout(struct iscsit_conn *conn, struct iscsit_cmd *cmd, bool recovery)
2137	{
2138	struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2139	int ret;
2140
2141	isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2142	isert_cmd, cmd->se_cmd.data_length, cmd->write_data_done);
2143
2144	isert_cmd->tx_desc.tx_cqe.done = isert_rdma_read_done;
2145	ret = isert_rdma_rw_ctx_post(cmd: isert_cmd, conn: conn->context,
2146	cqe: &isert_cmd->tx_desc.tx_cqe, NULL);
2147
2148	isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE rc: %d\n",
2149	isert_cmd, ret);
2150	return ret;
2151	}
2152
2153	static int
2154	isert_immediate_queue(struct iscsit_conn *conn, struct iscsit_cmd *cmd, int state)
2155	{
2156	struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2157	int ret = 0;
2158
2159	switch (state) {
2160	case ISTATE_REMOVE:
2161	spin_lock_bh(lock: &conn->cmd_lock);
2162	list_del_init(entry: &cmd->i_conn_node);
2163	spin_unlock_bh(lock: &conn->cmd_lock);
2164	isert_put_cmd(isert_cmd, comp_err: true);
2165	break;
2166	case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2167	ret = isert_put_nopin(cmd, conn, nopout_response: false);
2168	break;
2169	default:
2170	isert_err("Unknown immediate state: 0x%02x\n", state);
2171	ret = -EINVAL;
2172	break;
2173	}
2174
2175	return ret;
2176	}
2177
2178	static int
2179	isert_response_queue(struct iscsit_conn *conn, struct iscsit_cmd *cmd, int state)
2180	{
2181	struct isert_conn *isert_conn = conn->context;
2182	int ret;
2183
2184	switch (state) {
2185	case ISTATE_SEND_LOGOUTRSP:
2186	ret = isert_put_logout_rsp(cmd, conn);
2187	if (!ret)
2188	isert_conn->logout_posted = true;
2189	break;
2190	case ISTATE_SEND_NOPIN:
2191	ret = isert_put_nopin(cmd, conn, nopout_response: true);
2192	break;
2193	case ISTATE_SEND_TASKMGTRSP:
2194	ret = isert_put_tm_rsp(cmd, conn);
2195	break;
2196	case ISTATE_SEND_REJECT:
2197	ret = isert_put_reject(cmd, conn);
2198	break;
2199	case ISTATE_SEND_TEXTRSP:
2200	ret = isert_put_text_rsp(cmd, conn);
2201	break;
2202	case ISTATE_SEND_STATUS:
2203	/*
2204	* Special case for sending non GOOD SCSI status from TX thread
2205	* context during pre se_cmd excecution failure.
2206	*/
2207	ret = isert_put_response(conn, cmd);
2208	break;
2209	default:
2210	isert_err("Unknown response state: 0x%02x\n", state);
2211	ret = -EINVAL;
2212	break;
2213	}
2214
2215	return ret;
2216	}
2217
2218	struct rdma_cm_id *
2219	isert_setup_id(struct isert_np *isert_np)
2220	{
2221	struct iscsi_np *np = isert_np->np;
2222	struct rdma_cm_id *id;
2223	struct sockaddr *sa;
2224	int ret;
2225
2226	sa = (struct sockaddr *)&np->np_sockaddr;
2227	isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa);
2228
2229	id = rdma_create_id(&init_net, isert_cma_handler, isert_np,
2230	RDMA_PS_TCP, IB_QPT_RC);
2231	if (IS_ERR(ptr: id)) {
2232	isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id));
2233	ret = PTR_ERR(ptr: id);
2234	goto out;
2235	}
2236	isert_dbg("id %p context %p\n", id, id->context);
2237
2238	/*
2239	* Allow both IPv4 and IPv6 sockets to bind a single port
2240	* at the same time.
2241	*/
2242	ret = rdma_set_afonly(id, afonly: 1);
2243	if (ret) {
2244	isert_err("rdma_set_afonly() failed: %d\n", ret);
2245	goto out_id;
2246	}
2247
2248	ret = rdma_bind_addr(id, addr: sa);
2249	if (ret) {
2250	isert_err("rdma_bind_addr() failed: %d\n", ret);
2251	goto out_id;
2252	}
2253
2254	ret = rdma_listen(id, backlog: 0);
2255	if (ret) {
2256	isert_err("rdma_listen() failed: %d\n", ret);
2257	goto out_id;
2258	}
2259
2260	return id;
2261	out_id:
2262	rdma_destroy_id(id);
2263	out:
2264	return ERR_PTR(error: ret);
2265	}
2266
2267	static int
2268	isert_setup_np(struct iscsi_np *np,
2269	struct sockaddr_storage *ksockaddr)
2270	{
2271	struct isert_np *isert_np;
2272	struct rdma_cm_id *isert_lid;
2273	int ret;
2274
2275	isert_np = kzalloc(size: sizeof(struct isert_np), GFP_KERNEL);
2276	if (!isert_np)
2277	return -ENOMEM;
2278
2279	sema_init(sem: &isert_np->sem, val: 0);
2280	mutex_init(&isert_np->mutex);
2281	INIT_LIST_HEAD(list: &isert_np->accepted);
2282	INIT_LIST_HEAD(list: &isert_np->pending);
2283	isert_np->np = np;
2284
2285	/*
2286	* Setup the np->np_sockaddr from the passed sockaddr setup
2287	* in iscsi_target_configfs.c code..
2288	*/
2289	memcpy(&np->np_sockaddr, ksockaddr,
2290	sizeof(struct sockaddr_storage));
2291
2292	isert_lid = isert_setup_id(isert_np);
2293	if (IS_ERR(ptr: isert_lid)) {
2294	ret = PTR_ERR(ptr: isert_lid);
2295	goto out;
2296	}
2297
2298	isert_np->cm_id = isert_lid;
2299	np->np_context = isert_np;
2300
2301	return 0;
2302
2303	out:
2304	kfree(objp: isert_np);
2305
2306	return ret;
2307	}
2308
2309	static int
2310	isert_rdma_accept(struct isert_conn *isert_conn)
2311	{
2312	struct rdma_cm_id *cm_id = isert_conn->cm_id;
2313	struct rdma_conn_param cp;
2314	int ret;
2315	struct iser_cm_hdr rsp_hdr;
2316
2317	memset(&cp, 0, sizeof(struct rdma_conn_param));
2318	cp.initiator_depth = isert_conn->initiator_depth;
2319	cp.retry_count = 7;
2320	cp.rnr_retry_count = 7;
2321
2322	memset(&rsp_hdr, 0, sizeof(rsp_hdr));
2323	rsp_hdr.flags = ISERT_ZBVA_NOT_USED;
2324	if (!isert_conn->snd_w_inv)
2325	rsp_hdr.flags = rsp_hdr.flags | ISERT_SEND_W_INV_NOT_USED;
2326	cp.private_data = (void *)&rsp_hdr;
2327	cp.private_data_len = sizeof(rsp_hdr);
2328
2329	ret = rdma_accept(id: cm_id, conn_param: &cp);
2330	if (ret) {
2331	isert_err("rdma_accept() failed with: %d\n", ret);
2332	return ret;
2333	}
2334
2335	return 0;
2336	}
2337
2338	static int
2339	isert_get_login_rx(struct iscsit_conn *conn, struct iscsi_login *login)
2340	{
2341	struct isert_conn *isert_conn = conn->context;
2342	int ret;
2343
2344	isert_info("before login_req comp conn: %p\n", isert_conn);
2345	ret = wait_for_completion_interruptible(x: &isert_conn->login_req_comp);
2346	if (ret) {
2347	isert_err("isert_conn %p interrupted before got login req\n",
2348	isert_conn);
2349	return ret;
2350	}
2351	reinit_completion(x: &isert_conn->login_req_comp);
2352
2353	/*
2354	* For login requests after the first PDU, isert_rx_login_req() will
2355	* kick queue_delayed_work(isert_login_wq, &conn->login_work) as
2356	* the packet is received, which turns this callback from
2357	* iscsi_target_do_login_rx() into a NOP.
2358	*/
2359	if (!login->first_request)
2360	return 0;
2361
2362	isert_rx_login_req(isert_conn);
2363
2364	isert_info("before login_comp conn: %p\n", conn);
2365	ret = wait_for_completion_interruptible(x: &isert_conn->login_comp);
2366	if (ret)
2367	return ret;
2368
2369	isert_info("processing login->req: %p\n", login->req);
2370
2371	return 0;
2372	}
2373
2374	static void
2375	isert_set_conn_info(struct iscsi_np *np, struct iscsit_conn *conn,
2376	struct isert_conn *isert_conn)
2377	{
2378	struct rdma_cm_id *cm_id = isert_conn->cm_id;
2379	struct rdma_route *cm_route = &cm_id->route;
2380
2381	conn->login_family = np->np_sockaddr.ss_family;
2382
2383	conn->login_sockaddr = cm_route->addr.dst_addr;
2384	conn->local_sockaddr = cm_route->addr.src_addr;
2385	}
2386
2387	static int
2388	isert_accept_np(struct iscsi_np *np, struct iscsit_conn *conn)
2389	{
2390	struct isert_np *isert_np = np->np_context;
2391	struct isert_conn *isert_conn;
2392	int ret;
2393
2394	accept_wait:
2395	ret = down_interruptible(sem: &isert_np->sem);
2396	if (ret)
2397	return -ENODEV;
2398
2399	spin_lock_bh(lock: &np->np_thread_lock);
2400	if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
2401	spin_unlock_bh(lock: &np->np_thread_lock);
2402	isert_dbg("np_thread_state %d\n",
2403	np->np_thread_state);
2404	/*
2405	* No point in stalling here when np_thread
2406	* is in state RESET/SHUTDOWN/EXIT - bail
2407	*/
2408	return -ENODEV;
2409	}
2410	spin_unlock_bh(lock: &np->np_thread_lock);
2411
2412	mutex_lock(&isert_np->mutex);
2413	if (list_empty(head: &isert_np->pending)) {
2414	mutex_unlock(lock: &isert_np->mutex);
2415	goto accept_wait;
2416	}
2417	isert_conn = list_first_entry(&isert_np->pending,
2418	struct isert_conn, node);
2419	list_del_init(entry: &isert_conn->node);
2420	mutex_unlock(lock: &isert_np->mutex);
2421
2422	conn->context = isert_conn;
2423	isert_conn->conn = conn;
2424	isert_conn->state = ISER_CONN_BOUND;
2425
2426	isert_set_conn_info(np, conn, isert_conn);
2427
2428	isert_dbg("Processing isert_conn: %p\n", isert_conn);
2429
2430	return 0;
2431	}
2432
2433	static void
2434	isert_free_np(struct iscsi_np *np)
2435	{
2436	struct isert_np *isert_np = np->np_context;
2437	struct isert_conn *isert_conn, *n;
2438	LIST_HEAD(drop_conn_list);
2439
2440	if (isert_np->cm_id)
2441	rdma_destroy_id(id: isert_np->cm_id);
2442
2443	/*
2444	* FIXME: At this point we don't have a good way to insure
2445	* that at this point we don't have hanging connections that
2446	* completed RDMA establishment but didn't start iscsi login
2447	* process. So work-around this by cleaning up what ever piled
2448	* up in accepted and pending lists.
2449	*/
2450	mutex_lock(&isert_np->mutex);
2451	if (!list_empty(head: &isert_np->pending)) {
2452	isert_info("Still have isert pending connections\n");
2453	list_for_each_entry_safe(isert_conn, n,
2454	&isert_np->pending,
2455	node) {
2456	isert_info("cleaning isert_conn %p state (%d)\n",
2457	isert_conn, isert_conn->state);
2458	list_move_tail(list: &isert_conn->node, head: &drop_conn_list);
2459	}
2460	}
2461
2462	if (!list_empty(head: &isert_np->accepted)) {
2463	isert_info("Still have isert accepted connections\n");
2464	list_for_each_entry_safe(isert_conn, n,
2465	&isert_np->accepted,
2466	node) {
2467	isert_info("cleaning isert_conn %p state (%d)\n",
2468	isert_conn, isert_conn->state);
2469	list_move_tail(list: &isert_conn->node, head: &drop_conn_list);
2470	}
2471	}
2472	mutex_unlock(lock: &isert_np->mutex);
2473
2474	list_for_each_entry_safe(isert_conn, n, &drop_conn_list, node) {
2475	list_del_init(entry: &isert_conn->node);
2476	isert_connect_release(isert_conn);
2477	}
2478
2479	np->np_context = NULL;
2480	kfree(objp: isert_np);
2481	}
2482
2483	static void isert_release_work(struct work_struct *work)
2484	{
2485	struct isert_conn *isert_conn = container_of(work,
2486	struct isert_conn,
2487	release_work);
2488
2489	isert_info("Starting release conn %p\n", isert_conn);
2490
2491	mutex_lock(&isert_conn->mutex);
2492	isert_conn->state = ISER_CONN_DOWN;
2493	mutex_unlock(lock: &isert_conn->mutex);
2494
2495	isert_info("Destroying conn %p\n", isert_conn);
2496	isert_put_conn(isert_conn);
2497	}
2498
2499	static void
2500	isert_wait4logout(struct isert_conn *isert_conn)
2501	{
2502	struct iscsit_conn *conn = isert_conn->conn;
2503
2504	isert_info("conn %p\n", isert_conn);
2505
2506	if (isert_conn->logout_posted) {
2507	isert_info("conn %p wait for conn_logout_comp\n", isert_conn);
2508	wait_for_completion_timeout(x: &conn->conn_logout_comp,
2509	SECONDS_FOR_LOGOUT_COMP * HZ);
2510	}
2511	}
2512
2513	static void
2514	isert_wait4cmds(struct iscsit_conn *conn)
2515	{
2516	isert_info("iscsit_conn %p\n", conn);
2517
2518	if (conn->sess) {
2519	target_stop_cmd_counter(cmd_cnt: conn->cmd_cnt);
2520	target_wait_for_cmds(cmd_cnt: conn->cmd_cnt);
2521	}
2522	}
2523
2524	/**
2525	* isert_put_unsol_pending_cmds() - Drop commands waiting for
2526	* unsolicitate dataout
2527	* @conn: iscsi connection
2528	*
2529	* We might still have commands that are waiting for unsolicited
2530	* dataouts messages. We must put the extra reference on those
2531	* before blocking on the target_wait_for_session_cmds
2532	*/
2533	static void
2534	isert_put_unsol_pending_cmds(struct iscsit_conn *conn)
2535	{
2536	struct iscsit_cmd *cmd, *tmp;
2537	static LIST_HEAD(drop_cmd_list);
2538
2539	spin_lock_bh(lock: &conn->cmd_lock);
2540	list_for_each_entry_safe(cmd, tmp, &conn->conn_cmd_list, i_conn_node) {
2541	if ((cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA) &&
2542	(cmd->write_data_done < conn->sess->sess_ops->FirstBurstLength) &&
2543	(cmd->write_data_done < cmd->se_cmd.data_length))
2544	list_move_tail(list: &cmd->i_conn_node, head: &drop_cmd_list);
2545	}
2546	spin_unlock_bh(lock: &conn->cmd_lock);
2547
2548	list_for_each_entry_safe(cmd, tmp, &drop_cmd_list, i_conn_node) {
2549	list_del_init(entry: &cmd->i_conn_node);
2550	if (cmd->i_state != ISTATE_REMOVE) {
2551	struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2552
2553	isert_info("conn %p dropping cmd %p\n", conn, cmd);
2554	isert_put_cmd(isert_cmd, comp_err: true);
2555	}
2556	}
2557	}
2558
2559	static void isert_wait_conn(struct iscsit_conn *conn)
2560	{
2561	struct isert_conn *isert_conn = conn->context;
2562
2563	isert_info("Starting conn %p\n", isert_conn);
2564
2565	mutex_lock(&isert_conn->mutex);
2566	isert_conn_terminate(isert_conn);
2567	mutex_unlock(lock: &isert_conn->mutex);
2568
2569	ib_drain_qp(qp: isert_conn->qp);
2570	isert_put_unsol_pending_cmds(conn);
2571	isert_wait4cmds(conn);
2572	isert_wait4logout(isert_conn);
2573
2574	queue_work(wq: isert_release_wq, work: &isert_conn->release_work);
2575	}
2576
2577	static void isert_free_conn(struct iscsit_conn *conn)
2578	{
2579	struct isert_conn *isert_conn = conn->context;
2580
2581	ib_drain_qp(qp: isert_conn->qp);
2582	isert_put_conn(isert_conn);
2583	}
2584
2585	static void isert_get_rx_pdu(struct iscsit_conn *conn)
2586	{
2587	struct completion comp;
2588
2589	init_completion(x: &comp);
2590
2591	wait_for_completion_interruptible(x: &comp);
2592	}
2593
2594	static struct iscsit_transport iser_target_transport = {
2595	.name = "IB/iSER",
2596	.transport_type = ISCSI_INFINIBAND,
2597	.rdma_shutdown = true,
2598	.priv_size = sizeof(struct isert_cmd),
2599	.owner = THIS_MODULE,
2600	.iscsit_setup_np = isert_setup_np,
2601	.iscsit_accept_np = isert_accept_np,
2602	.iscsit_free_np = isert_free_np,
2603	.iscsit_wait_conn = isert_wait_conn,
2604	.iscsit_free_conn = isert_free_conn,
2605	.iscsit_get_login_rx = isert_get_login_rx,
2606	.iscsit_put_login_tx = isert_put_login_tx,
2607	.iscsit_immediate_queue = isert_immediate_queue,
2608	.iscsit_response_queue = isert_response_queue,
2609	.iscsit_get_dataout = isert_get_dataout,
2610	.iscsit_queue_data_in = isert_put_datain,
2611	.iscsit_queue_status = isert_put_response,
2612	.iscsit_aborted_task = isert_aborted_task,
2613	.iscsit_get_rx_pdu = isert_get_rx_pdu,
2614	.iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
2615	};
2616
2617	static int __init isert_init(void)
2618	{
2619	isert_login_wq = alloc_workqueue(fmt: "isert_login_wq", flags: 0, max_active: 0);
2620	if (!isert_login_wq) {
2621	isert_err("Unable to allocate isert_login_wq\n");
2622	return -ENOMEM;
2623	}
2624
2625	isert_comp_wq = alloc_workqueue(fmt: "isert_comp_wq",
2626	flags: WQ_UNBOUND | WQ_HIGHPRI, max_active: 0);
2627	if (!isert_comp_wq) {
2628	isert_err("Unable to allocate isert_comp_wq\n");
2629	goto destroy_login_wq;
2630	}
2631
2632	isert_release_wq = alloc_workqueue(fmt: "isert_release_wq", flags: WQ_UNBOUND,
2633	max_active: WQ_UNBOUND_MAX_ACTIVE);
2634	if (!isert_release_wq) {
2635	isert_err("Unable to allocate isert_release_wq\n");
2636	goto destroy_comp_wq;
2637	}
2638
2639	iscsit_register_transport(&iser_target_transport);
2640	isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n");
2641
2642	return 0;
2643
2644	destroy_comp_wq:
2645	destroy_workqueue(wq: isert_comp_wq);
2646	destroy_login_wq:
2647	destroy_workqueue(wq: isert_login_wq);
2648
2649	return -ENOMEM;
2650	}
2651
2652	static void __exit isert_exit(void)
2653	{
2654	flush_workqueue(isert_login_wq);
2655	destroy_workqueue(wq: isert_release_wq);
2656	destroy_workqueue(wq: isert_comp_wq);
2657	iscsit_unregister_transport(&iser_target_transport);
2658	isert_info("iSER_TARGET[0] - Released iser_target_transport\n");
2659	destroy_workqueue(wq: isert_login_wq);
2660	}
2661
2662	MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
2663	MODULE_AUTHOR("nab@Linux-iSCSI.org");
2664	MODULE_LICENSE("GPL");
2665
2666	module_init(isert_init);
2667	module_exit(isert_exit);
2668