1/*
  2 * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
  3 * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved.
  4 *
  5 * This software is available to you under a choice of one of two
  6 * licenses.  You may choose to be licensed under the terms of the GNU
  7 * General Public License (GPL) Version 2, available from the file
  8 * COPYING in the main directory of this source tree, or the
  9 * OpenIB.org BSD license below:
 10 *
 11 *     Redistribution and use in source and binary forms, with or
 12 *     without modification, are permitted provided that the following
 13 *     conditions are met:
 14 *
 15 *	- Redistributions of source code must retain the above
 16 *	  copyright notice, this list of conditions and the following
 17 *	  disclaimer.
 18 *
 19 *	- Redistributions in binary form must reproduce the above
 20 *	  copyright notice, this list of conditions and the following
 21 *	  disclaimer in the documentation and/or other materials
 22 *	  provided with the distribution.
 23 *
 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 31 * SOFTWARE.
 32 */
 33#include <linux/kernel.h>
 34#include <linux/slab.h>
 35#include <linux/mm.h>
 36#include <linux/scatterlist.h>
 37#include <linux/kfifo.h>
 38#include <scsi/scsi_cmnd.h>
 39#include <scsi/scsi_host.h>
 40
 41#include "iscsi_iser.h"
 42
 43/* Register user buffer memory and initialize passive rdma
 44 *  dto descriptor. Data size is stored in
 45 *  task->data[ISER_DIR_IN].data_len, Protection size
 46 *  os stored in task->prot[ISER_DIR_IN].data_len
 47 */
 48static int iser_prepare_read_cmd(struct iscsi_task *task)
 49
 50{
 51	struct iscsi_iser_task *iser_task = task->dd_data;
 52	struct iser_mem_reg *mem_reg;
 53	int err;
 54	struct iser_ctrl *hdr = &iser_task->desc.iser_header;
 55
 56	err = iser_dma_map_task_data(iser_task,
 57				     ISER_DIR_IN,
 58				     DMA_FROM_DEVICE);
 59	if (err)
 60		return err;
 61
 62	err = iser_reg_mem_fastreg(iser_task, ISER_DIR_IN, false);
 63	if (err) {
 64		iser_err("Failed to set up Data-IN RDMA\n");
 65		goto out_err;
 66	}
 67	mem_reg = &iser_task->rdma_reg[ISER_DIR_IN];
 68
 69	hdr->flags    |= ISER_RSV;
 70	hdr->read_stag = cpu_to_be32(mem_reg->rkey);
 71	hdr->read_va   = cpu_to_be64(mem_reg->sge.addr);
 72
 73	iser_dbg("Cmd itt:%d READ tags RKEY:%#.4X VA:%#llX\n",
 74		 task->itt, mem_reg->rkey,
 75		 (unsigned long long)mem_reg->sge.addr);
 76
 77	return 0;
 78
 79out_err:
 80	iser_dma_unmap_task_data(iser_task, ISER_DIR_IN, DMA_FROM_DEVICE);
 81	return err;
 82}
 83
 84/* Register user buffer memory and initialize passive rdma
 85 *  dto descriptor. Data size is stored in
 86 *  task->data[ISER_DIR_OUT].data_len, Protection size
 87 *  is stored at task->prot[ISER_DIR_OUT].data_len
 88 */
 89static int iser_prepare_write_cmd(struct iscsi_task *task, unsigned int imm_sz,
 90				  unsigned int unsol_sz, unsigned int edtl)
 91{
 92	struct iscsi_iser_task *iser_task = task->dd_data;
 93	struct iser_mem_reg *mem_reg;
 94	int err;
 95	struct iser_ctrl *hdr = &iser_task->desc.iser_header;
 96	struct iser_data_buf *buf_out = &iser_task->data[ISER_DIR_OUT];
 97	struct ib_sge *tx_dsg = &iser_task->desc.tx_sg[1];
 98
 99	err = iser_dma_map_task_data(iser_task,
100				     ISER_DIR_OUT,
101				     DMA_TO_DEVICE);
102	if (err)
103		return err;
104
105	err = iser_reg_mem_fastreg(iser_task, ISER_DIR_OUT,
106				   buf_out->data_len == imm_sz);
107	if (err) {
108		iser_err("Failed to register write cmd RDMA mem\n");
109		goto out_err;
110	}
111
112	mem_reg = &iser_task->rdma_reg[ISER_DIR_OUT];
113
114	if (unsol_sz < edtl) {
115		hdr->flags     |= ISER_WSV;
116		if (buf_out->data_len > imm_sz) {
117			hdr->write_stag = cpu_to_be32(mem_reg->rkey);
118			hdr->write_va = cpu_to_be64(mem_reg->sge.addr + unsol_sz);
119		}
120
121		iser_dbg("Cmd itt:%d, WRITE tags, RKEY:%#.4X VA:%#llX + unsol:%d\n",
122			 task->itt, mem_reg->rkey,
123			 (unsigned long long)mem_reg->sge.addr, unsol_sz);
124	}
125
126	if (imm_sz > 0) {
127		iser_dbg("Cmd itt:%d, WRITE, adding imm.data sz: %d\n",
128			 task->itt, imm_sz);
129		tx_dsg->addr = mem_reg->sge.addr;
130		tx_dsg->length = imm_sz;
131		tx_dsg->lkey = mem_reg->sge.lkey;
132		iser_task->desc.num_sge = 2;
133	}
134
135	return 0;
136
137out_err:
138	iser_dma_unmap_task_data(iser_task, ISER_DIR_OUT, DMA_TO_DEVICE);
139	return err;
140}
141
142/* creates a new tx descriptor and adds header regd buffer */
143static void iser_create_send_desc(struct iser_conn *iser_conn,
144		struct iser_tx_desc *tx_desc, enum iser_desc_type type,
145		void (*done)(struct ib_cq *cq, struct ib_wc *wc))
146{
147	struct iser_device *device = iser_conn->ib_conn.device;
148
149	tx_desc->type = type;
150	tx_desc->cqe.done = done;
151
152	ib_dma_sync_single_for_cpu(device->ib_device,
153		tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE);
154
155	memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl));
156	tx_desc->iser_header.flags = ISER_VER;
157	tx_desc->num_sge = 1;
158}
159
160static void iser_free_login_buf(struct iser_conn *iser_conn)
161{
162	struct iser_device *device = iser_conn->ib_conn.device;
163	struct iser_login_desc *desc = &iser_conn->login_desc;
164
165	if (!desc->req)
166		return;
167
168	ib_dma_unmap_single(device->ib_device, desc->req_dma,
169			    ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_TO_DEVICE);
170
171	ib_dma_unmap_single(device->ib_device, desc->rsp_dma,
172			    ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE);
173
174	kfree(desc->req);
175	kfree(desc->rsp);
176
177	/* make sure we never redo any unmapping */
178	desc->req = NULL;
179	desc->rsp = NULL;
180}
181
182static int iser_alloc_login_buf(struct iser_conn *iser_conn)
183{
184	struct iser_device *device = iser_conn->ib_conn.device;
185	struct iser_login_desc *desc = &iser_conn->login_desc;
186
187	desc->req = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL);
188	if (!desc->req)
189		return -ENOMEM;
190
191	desc->req_dma = ib_dma_map_single(device->ib_device, desc->req,
192					  ISCSI_DEF_MAX_RECV_SEG_LEN,
193					  DMA_TO_DEVICE);
194	if (ib_dma_mapping_error(device->ib_device,
195				desc->req_dma))
196		goto free_req;
197
198	desc->rsp = kmalloc(ISER_RX_LOGIN_SIZE, GFP_KERNEL);
199	if (!desc->rsp)
200		goto unmap_req;
201
202	desc->rsp_dma = ib_dma_map_single(device->ib_device, desc->rsp,
203					   ISER_RX_LOGIN_SIZE,
204					   DMA_FROM_DEVICE);
205	if (ib_dma_mapping_error(device->ib_device,
206				desc->rsp_dma))
207		goto free_rsp;
208
209	return 0;
210
211free_rsp:
212	kfree(desc->rsp);
213unmap_req:
214	ib_dma_unmap_single(device->ib_device, desc->req_dma,
215			    ISCSI_DEF_MAX_RECV_SEG_LEN,
216			    DMA_TO_DEVICE);
217free_req:
218	kfree(desc->req);
219
220	return -ENOMEM;
221}
222
223int iser_alloc_rx_descriptors(struct iser_conn *iser_conn,
224			      struct iscsi_session *session)
225{
226	int i, j;
227	u64 dma_addr;
228	struct iser_rx_desc *rx_desc;
229	struct ib_sge       *rx_sg;
230	struct ib_conn *ib_conn = &iser_conn->ib_conn;
231	struct iser_device *device = ib_conn->device;
232
233	iser_conn->qp_max_recv_dtos = session->cmds_max;
234
235	if (iser_alloc_fastreg_pool(ib_conn, session->scsi_cmds_max,
236				    iser_conn->pages_per_mr))
237		goto create_rdma_reg_res_failed;
238
239	if (iser_alloc_login_buf(iser_conn))
240		goto alloc_login_buf_fail;
241
242	iser_conn->num_rx_descs = session->cmds_max;
243	iser_conn->rx_descs = kmalloc_array(iser_conn->num_rx_descs,
244					    sizeof(struct iser_rx_desc),
245					    GFP_KERNEL);
246	if (!iser_conn->rx_descs)
247		goto rx_desc_alloc_fail;
248
249	rx_desc = iser_conn->rx_descs;
250
251	for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++)  {
252		dma_addr = ib_dma_map_single(device->ib_device, (void *)rx_desc,
253					ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
254		if (ib_dma_mapping_error(device->ib_device, dma_addr))
255			goto rx_desc_dma_map_failed;
256
257		rx_desc->dma_addr = dma_addr;
258		rx_desc->cqe.done = iser_task_rsp;
259		rx_sg = &rx_desc->rx_sg;
260		rx_sg->addr = rx_desc->dma_addr;
261		rx_sg->length = ISER_RX_PAYLOAD_SIZE;
262		rx_sg->lkey = device->pd->local_dma_lkey;
263	}
264
265	return 0;
266
267rx_desc_dma_map_failed:
268	rx_desc = iser_conn->rx_descs;
269	for (j = 0; j < i; j++, rx_desc++)
270		ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr,
271				    ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
272	kfree(iser_conn->rx_descs);
273	iser_conn->rx_descs = NULL;
274rx_desc_alloc_fail:
275	iser_free_login_buf(iser_conn);
276alloc_login_buf_fail:
277	iser_free_fastreg_pool(ib_conn);
278create_rdma_reg_res_failed:
279	iser_err("failed allocating rx descriptors / data buffers\n");
280	return -ENOMEM;
281}
282
283void iser_free_rx_descriptors(struct iser_conn *iser_conn)
284{
285	int i;
286	struct iser_rx_desc *rx_desc;
287	struct ib_conn *ib_conn = &iser_conn->ib_conn;
288	struct iser_device *device = ib_conn->device;
289
290	iser_free_fastreg_pool(ib_conn);
291
292	rx_desc = iser_conn->rx_descs;
293	for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++)
294		ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr,
295				    ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
296	kfree(iser_conn->rx_descs);
297	/* make sure we never redo any unmapping */
298	iser_conn->rx_descs = NULL;
299
300	iser_free_login_buf(iser_conn);
301}
302
303static int iser_post_rx_bufs(struct iscsi_conn *conn, struct iscsi_hdr *req)
304{
305	struct iser_conn *iser_conn = conn->dd_data;
306	struct iscsi_session *session = conn->session;
307	int err = 0;
308	int i;
309
310	iser_dbg("req op %x flags %x\n", req->opcode, req->flags);
311	/* check if this is the last login - going to full feature phase */
312	if ((req->flags & ISCSI_FULL_FEATURE_PHASE) != ISCSI_FULL_FEATURE_PHASE)
313		goto out;
314
315	if (session->discovery_sess) {
316		iser_info("Discovery session, re-using login RX buffer\n");
317		goto out;
318	}
319
320	iser_info("Normal session, posting batch of RX %d buffers\n",
321		  iser_conn->qp_max_recv_dtos - 1);
322
323	/*
324	 * Initial post receive buffers.
325	 * There is one already posted recv buffer (for the last login
326	 * response). Therefore, the first recv buffer is skipped here.
327	 */
328	for (i = 1; i < iser_conn->qp_max_recv_dtos; i++) {
329		err = iser_post_recvm(iser_conn, &iser_conn->rx_descs[i]);
330		if (err)
331			goto out;
332	}
333out:
334	return err;
335}
336
337/**
338 * iser_send_command - send command PDU
339 * @conn: link to matching iscsi connection
340 * @task: SCSI command task
341 */
342int iser_send_command(struct iscsi_conn *conn, struct iscsi_task *task)
343{
344	struct iser_conn *iser_conn = conn->dd_data;
345	struct iscsi_iser_task *iser_task = task->dd_data;
346	unsigned long edtl;
347	int err;
348	struct iser_data_buf *data_buf, *prot_buf;
349	struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)task->hdr;
350	struct scsi_cmnd *sc  =  task->sc;
351	struct iser_tx_desc *tx_desc = &iser_task->desc;
352
353	edtl = ntohl(hdr->data_length);
354
355	/* build the tx desc regd header and add it to the tx desc dto */
356	iser_create_send_desc(iser_conn, tx_desc, ISCSI_TX_SCSI_COMMAND,
357			      iser_cmd_comp);
358
359	if (hdr->flags & ISCSI_FLAG_CMD_READ) {
360		data_buf = &iser_task->data[ISER_DIR_IN];
361		prot_buf = &iser_task->prot[ISER_DIR_IN];
362	} else {
363		data_buf = &iser_task->data[ISER_DIR_OUT];
364		prot_buf = &iser_task->prot[ISER_DIR_OUT];
365	}
366
367	if (scsi_sg_count(sc)) { /* using a scatter list */
368		data_buf->sg = scsi_sglist(sc);
369		data_buf->size = scsi_sg_count(sc);
370	}
371	data_buf->data_len = scsi_bufflen(sc);
372
373	if (scsi_prot_sg_count(sc)) {
374		prot_buf->sg  = scsi_prot_sglist(sc);
375		prot_buf->size = scsi_prot_sg_count(sc);
376		prot_buf->data_len = (data_buf->data_len >>
377				     ilog2(sc->device->sector_size)) * 8;
378	}
379
380	if (hdr->flags & ISCSI_FLAG_CMD_READ) {
381		err = iser_prepare_read_cmd(task);
382		if (err)
383			goto send_command_error;
384	}
385	if (hdr->flags & ISCSI_FLAG_CMD_WRITE) {
386		err = iser_prepare_write_cmd(task,
387					     task->imm_count,
388				             task->imm_count +
389					     task->unsol_r2t.data_length,
390					     edtl);
391		if (err)
392			goto send_command_error;
393	}
394
395	iser_task->status = ISER_TASK_STATUS_STARTED;
396
397	err = iser_post_send(&iser_conn->ib_conn, tx_desc);
398	if (!err)
399		return 0;
400
401send_command_error:
402	iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err);
403	return err;
404}
405
406/**
407 * iser_send_data_out - send data out PDU
408 * @conn: link to matching iscsi connection
409 * @task: SCSI command task
410 * @hdr: pointer to the LLD's iSCSI message header
411 */
412int iser_send_data_out(struct iscsi_conn *conn, struct iscsi_task *task,
413		       struct iscsi_data *hdr)
414{
415	struct iser_conn *iser_conn = conn->dd_data;
416	struct iscsi_iser_task *iser_task = task->dd_data;
417	struct iser_tx_desc *tx_desc;
418	struct iser_mem_reg *mem_reg;
419	unsigned long buf_offset;
420	unsigned long data_seg_len;
421	uint32_t itt;
422	int err;
423	struct ib_sge *tx_dsg;
424
425	itt = (__force uint32_t)hdr->itt;
426	data_seg_len = ntoh24(hdr->dlength);
427	buf_offset   = ntohl(hdr->offset);
428
429	iser_dbg("%s itt %d dseg_len %d offset %d\n",
430		 __func__,(int)itt,(int)data_seg_len,(int)buf_offset);
431
432	tx_desc = kmem_cache_zalloc(ig.desc_cache, GFP_ATOMIC);
433	if (!tx_desc)
434		return -ENOMEM;
435
436	tx_desc->type = ISCSI_TX_DATAOUT;
437	tx_desc->cqe.done = iser_dataout_comp;
438	tx_desc->iser_header.flags = ISER_VER;
439	memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr));
440
441	/* build the tx desc */
442	err = iser_initialize_task_headers(task, tx_desc);
443	if (err)
444		goto send_data_out_error;
445
446	mem_reg = &iser_task->rdma_reg[ISER_DIR_OUT];
447	tx_dsg = &tx_desc->tx_sg[1];
448	tx_dsg->addr = mem_reg->sge.addr + buf_offset;
449	tx_dsg->length = data_seg_len;
450	tx_dsg->lkey = mem_reg->sge.lkey;
451	tx_desc->num_sge = 2;
452
453	if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) {
454		iser_err("Offset:%ld & DSL:%ld in Data-Out inconsistent with total len:%ld, itt:%d\n",
455			 buf_offset, data_seg_len,
456			 iser_task->data[ISER_DIR_OUT].data_len, itt);
457		err = -EINVAL;
458		goto send_data_out_error;
459	}
460	iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n",
461		 itt, buf_offset, data_seg_len);
462
463	err = iser_post_send(&iser_conn->ib_conn, tx_desc);
464	if (!err)
465		return 0;
466
467send_data_out_error:
468	kmem_cache_free(ig.desc_cache, tx_desc);
469	iser_err("conn %p failed err %d\n", conn, err);
470	return err;
471}
472
473int iser_send_control(struct iscsi_conn *conn, struct iscsi_task *task)
474{
475	struct iser_conn *iser_conn = conn->dd_data;
476	struct iscsi_iser_task *iser_task = task->dd_data;
477	struct iser_tx_desc *mdesc = &iser_task->desc;
478	unsigned long data_seg_len;
479	int err = 0;
480	struct iser_device *device;
481
482	/* build the tx desc regd header and add it to the tx desc dto */
483	iser_create_send_desc(iser_conn, mdesc, ISCSI_TX_CONTROL,
484			      iser_ctrl_comp);
485
486	device = iser_conn->ib_conn.device;
487
488	data_seg_len = ntoh24(task->hdr->dlength);
489
490	if (data_seg_len > 0) {
491		struct iser_login_desc *desc = &iser_conn->login_desc;
492		struct ib_sge *tx_dsg = &mdesc->tx_sg[1];
493
494		if (task != conn->login_task) {
495			iser_err("data present on non login task!!!\n");
496			goto send_control_error;
497		}
498
499		ib_dma_sync_single_for_cpu(device->ib_device, desc->req_dma,
500					   task->data_count, DMA_TO_DEVICE);
501
502		memcpy(desc->req, task->data, task->data_count);
503
504		ib_dma_sync_single_for_device(device->ib_device, desc->req_dma,
505					      task->data_count, DMA_TO_DEVICE);
506
507		tx_dsg->addr = desc->req_dma;
508		tx_dsg->length = task->data_count;
509		tx_dsg->lkey = device->pd->local_dma_lkey;
510		mdesc->num_sge = 2;
511	}
512
513	if (task == conn->login_task) {
514		iser_dbg("op %x dsl %lx, posting login rx buffer\n",
515			 task->hdr->opcode, data_seg_len);
516		err = iser_post_recvl(iser_conn);
517		if (err)
518			goto send_control_error;
519		err = iser_post_rx_bufs(conn, task->hdr);
520		if (err)
521			goto send_control_error;
522	}
523
524	err = iser_post_send(&iser_conn->ib_conn, mdesc);
525	if (!err)
526		return 0;
527
528send_control_error:
529	iser_err("conn %p failed err %d\n",conn, err);
530	return err;
531}
532
533void iser_login_rsp(struct ib_cq *cq, struct ib_wc *wc)
534{
535	struct ib_conn *ib_conn = wc->qp->qp_context;
536	struct iser_conn *iser_conn = to_iser_conn(ib_conn);
537	struct iser_login_desc *desc = iser_login(wc->wr_cqe);
538	struct iscsi_hdr *hdr;
539	char *data;
540	int length;
541	bool full_feature_phase;
542
543	if (unlikely(wc->status != IB_WC_SUCCESS)) {
544		iser_err_comp(wc, "login_rsp");
545		return;
546	}
547
548	ib_dma_sync_single_for_cpu(ib_conn->device->ib_device,
549				   desc->rsp_dma, ISER_RX_LOGIN_SIZE,
550				   DMA_FROM_DEVICE);
551
552	hdr = desc->rsp + sizeof(struct iser_ctrl);
553	data = desc->rsp + ISER_HEADERS_LEN;
554	length = wc->byte_len - ISER_HEADERS_LEN;
555	full_feature_phase = ((hdr->flags & ISCSI_FULL_FEATURE_PHASE) ==
556			      ISCSI_FULL_FEATURE_PHASE) &&
557			     (hdr->flags & ISCSI_FLAG_CMD_FINAL);
558
559	iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode,
560		 hdr->itt, length);
561
562	iscsi_iser_recv(iser_conn->iscsi_conn, hdr, data, length);
563
564	ib_dma_sync_single_for_device(ib_conn->device->ib_device,
565				      desc->rsp_dma, ISER_RX_LOGIN_SIZE,
566				      DMA_FROM_DEVICE);
567
568	if (!full_feature_phase ||
569	    iser_conn->iscsi_conn->session->discovery_sess)
570		return;
571
572	/* Post the first RX buffer that is skipped in iser_post_rx_bufs() */
573	iser_post_recvm(iser_conn, iser_conn->rx_descs);
574}
575
576static inline int iser_inv_desc(struct iser_fr_desc *desc, u32 rkey)
577{
578	if (unlikely((!desc->sig_protected && rkey != desc->rsc.mr->rkey) ||
579		     (desc->sig_protected && rkey != desc->rsc.sig_mr->rkey))) {
580		iser_err("Bogus remote invalidation for rkey %#x\n", rkey);
581		return -EINVAL;
582	}
583
584	if (desc->sig_protected)
585		desc->rsc.sig_mr->need_inval = false;
586	else
587		desc->rsc.mr->need_inval = false;
588
589	return 0;
590}
591
592static int iser_check_remote_inv(struct iser_conn *iser_conn, struct ib_wc *wc,
593				 struct iscsi_hdr *hdr)
594{
595	if (wc->wc_flags & IB_WC_WITH_INVALIDATE) {
596		struct iscsi_task *task;
597		u32 rkey = wc->ex.invalidate_rkey;
598
599		iser_dbg("conn %p: remote invalidation for rkey %#x\n",
600			 iser_conn, rkey);
601
602		if (unlikely(!iser_conn->snd_w_inv)) {
603			iser_err("conn %p: unexpected remote invalidation, terminating connection\n",
604				 iser_conn);
605			return -EPROTO;
606		}
607
608		task = iscsi_itt_to_ctask(iser_conn->iscsi_conn, hdr->itt);
609		if (likely(task)) {
610			struct iscsi_iser_task *iser_task = task->dd_data;
611			struct iser_fr_desc *desc;
612
613			if (iser_task->dir[ISER_DIR_IN]) {
614				desc = iser_task->rdma_reg[ISER_DIR_IN].desc;
615				if (unlikely(iser_inv_desc(desc, rkey)))
616					return -EINVAL;
617			}
618
619			if (iser_task->dir[ISER_DIR_OUT]) {
620				desc = iser_task->rdma_reg[ISER_DIR_OUT].desc;
621				if (unlikely(iser_inv_desc(desc, rkey)))
622					return -EINVAL;
623			}
624		} else {
625			iser_err("failed to get task for itt=%d\n", hdr->itt);
626			return -EINVAL;
627		}
628	}
629
630	return 0;
631}
632
633
634void iser_task_rsp(struct ib_cq *cq, struct ib_wc *wc)
635{
636	struct ib_conn *ib_conn = wc->qp->qp_context;
637	struct iser_conn *iser_conn = to_iser_conn(ib_conn);
638	struct iser_rx_desc *desc = iser_rx(wc->wr_cqe);
639	struct iscsi_hdr *hdr;
640	int length, err;
641
642	if (unlikely(wc->status != IB_WC_SUCCESS)) {
643		iser_err_comp(wc, "task_rsp");
644		return;
645	}
646
647	ib_dma_sync_single_for_cpu(ib_conn->device->ib_device,
648				   desc->dma_addr, ISER_RX_PAYLOAD_SIZE,
649				   DMA_FROM_DEVICE);
650
651	hdr = &desc->iscsi_header;
652	length = wc->byte_len - ISER_HEADERS_LEN;
653
654	iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode,
655		 hdr->itt, length);
656
657	if (iser_check_remote_inv(iser_conn, wc, hdr)) {
658		iscsi_conn_failure(iser_conn->iscsi_conn,
659				   ISCSI_ERR_CONN_FAILED);
660		return;
661	}
662
663	iscsi_iser_recv(iser_conn->iscsi_conn, hdr, desc->data, length);
664
665	ib_dma_sync_single_for_device(ib_conn->device->ib_device,
666				      desc->dma_addr, ISER_RX_PAYLOAD_SIZE,
667				      DMA_FROM_DEVICE);
668
669	err = iser_post_recvm(iser_conn, desc);
670	if (err)
671		iser_err("posting rx buffer err %d\n", err);
672}
673
674void iser_cmd_comp(struct ib_cq *cq, struct ib_wc *wc)
675{
676	if (unlikely(wc->status != IB_WC_SUCCESS))
677		iser_err_comp(wc, "command");
678}
679
680void iser_ctrl_comp(struct ib_cq *cq, struct ib_wc *wc)
681{
682	struct iser_tx_desc *desc = iser_tx(wc->wr_cqe);
683	struct iscsi_task *task;
684
685	if (unlikely(wc->status != IB_WC_SUCCESS)) {
686		iser_err_comp(wc, "control");
687		return;
688	}
689
690	/* this arithmetic is legal by libiscsi dd_data allocation */
691	task = (void *)desc - sizeof(struct iscsi_task);
692	if (task->hdr->itt == RESERVED_ITT)
693		iscsi_put_task(task);
694}
695
696void iser_dataout_comp(struct ib_cq *cq, struct ib_wc *wc)
697{
698	struct iser_tx_desc *desc = iser_tx(wc->wr_cqe);
699	struct ib_conn *ib_conn = wc->qp->qp_context;
700	struct iser_device *device = ib_conn->device;
701
702	if (unlikely(wc->status != IB_WC_SUCCESS))
703		iser_err_comp(wc, "dataout");
704
705	ib_dma_unmap_single(device->ib_device, desc->dma_addr,
706			    ISER_HEADERS_LEN, DMA_TO_DEVICE);
707	kmem_cache_free(ig.desc_cache, desc);
708}
709
710void iser_task_rdma_init(struct iscsi_iser_task *iser_task)
711
712{
713	iser_task->status = ISER_TASK_STATUS_INIT;
714
715	iser_task->dir[ISER_DIR_IN] = 0;
716	iser_task->dir[ISER_DIR_OUT] = 0;
717
718	iser_task->data[ISER_DIR_IN].data_len  = 0;
719	iser_task->data[ISER_DIR_OUT].data_len = 0;
720
721	iser_task->prot[ISER_DIR_IN].data_len  = 0;
722	iser_task->prot[ISER_DIR_OUT].data_len = 0;
723
724	iser_task->prot[ISER_DIR_IN].dma_nents = 0;
725	iser_task->prot[ISER_DIR_OUT].dma_nents = 0;
726
727	memset(&iser_task->rdma_reg[ISER_DIR_IN], 0,
728	       sizeof(struct iser_mem_reg));
729	memset(&iser_task->rdma_reg[ISER_DIR_OUT], 0,
730	       sizeof(struct iser_mem_reg));
731}
732
733void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task)
734{
735
736	if (iser_task->dir[ISER_DIR_IN]) {
737		iser_unreg_mem_fastreg(iser_task, ISER_DIR_IN);
738		iser_dma_unmap_task_data(iser_task, ISER_DIR_IN,
739					 DMA_FROM_DEVICE);
740	}
741
742	if (iser_task->dir[ISER_DIR_OUT]) {
743		iser_unreg_mem_fastreg(iser_task, ISER_DIR_OUT);
744		iser_dma_unmap_task_data(iser_task, ISER_DIR_OUT,
745					 DMA_TO_DEVICE);
746	}
747}