xref: /openbmc/linux/drivers/scsi/qla2xxx/qla_iocb.c (revision a2cce7a9)
1 /*
2  * QLogic Fibre Channel HBA Driver
3  * Copyright (c)  2003-2014 QLogic Corporation
4  *
5  * See LICENSE.qla2xxx for copyright and licensing details.
6  */
7 #include "qla_def.h"
8 #include "qla_target.h"
9 
10 #include <linux/blkdev.h>
11 #include <linux/delay.h>
12 
13 #include <scsi/scsi_tcq.h>
14 
15 static void qla25xx_set_que(srb_t *, struct rsp_que **);
16 /**
17  * qla2x00_get_cmd_direction() - Determine control_flag data direction.
18  * @cmd: SCSI command
19  *
20  * Returns the proper CF_* direction based on CDB.
21  */
22 static inline uint16_t
23 qla2x00_get_cmd_direction(srb_t *sp)
24 {
25 	uint16_t cflags;
26 	struct scsi_cmnd *cmd = GET_CMD_SP(sp);
27 	struct scsi_qla_host *vha = sp->fcport->vha;
28 
29 	cflags = 0;
30 
31 	/* Set transfer direction */
32 	if (cmd->sc_data_direction == DMA_TO_DEVICE) {
33 		cflags = CF_WRITE;
34 		vha->qla_stats.output_bytes += scsi_bufflen(cmd);
35 		vha->qla_stats.output_requests++;
36 	} else if (cmd->sc_data_direction == DMA_FROM_DEVICE) {
37 		cflags = CF_READ;
38 		vha->qla_stats.input_bytes += scsi_bufflen(cmd);
39 		vha->qla_stats.input_requests++;
40 	}
41 	return (cflags);
42 }
43 
44 /**
45  * qla2x00_calc_iocbs_32() - Determine number of Command Type 2 and
46  * Continuation Type 0 IOCBs to allocate.
47  *
48  * @dsds: number of data segment decriptors needed
49  *
50  * Returns the number of IOCB entries needed to store @dsds.
51  */
52 uint16_t
53 qla2x00_calc_iocbs_32(uint16_t dsds)
54 {
55 	uint16_t iocbs;
56 
57 	iocbs = 1;
58 	if (dsds > 3) {
59 		iocbs += (dsds - 3) / 7;
60 		if ((dsds - 3) % 7)
61 			iocbs++;
62 	}
63 	return (iocbs);
64 }
65 
66 /**
67  * qla2x00_calc_iocbs_64() - Determine number of Command Type 3 and
68  * Continuation Type 1 IOCBs to allocate.
69  *
70  * @dsds: number of data segment decriptors needed
71  *
72  * Returns the number of IOCB entries needed to store @dsds.
73  */
74 uint16_t
75 qla2x00_calc_iocbs_64(uint16_t dsds)
76 {
77 	uint16_t iocbs;
78 
79 	iocbs = 1;
80 	if (dsds > 2) {
81 		iocbs += (dsds - 2) / 5;
82 		if ((dsds - 2) % 5)
83 			iocbs++;
84 	}
85 	return (iocbs);
86 }
87 
88 /**
89  * qla2x00_prep_cont_type0_iocb() - Initialize a Continuation Type 0 IOCB.
90  * @ha: HA context
91  *
92  * Returns a pointer to the Continuation Type 0 IOCB packet.
93  */
94 static inline cont_entry_t *
95 qla2x00_prep_cont_type0_iocb(struct scsi_qla_host *vha)
96 {
97 	cont_entry_t *cont_pkt;
98 	struct req_que *req = vha->req;
99 	/* Adjust ring index. */
100 	req->ring_index++;
101 	if (req->ring_index == req->length) {
102 		req->ring_index = 0;
103 		req->ring_ptr = req->ring;
104 	} else {
105 		req->ring_ptr++;
106 	}
107 
108 	cont_pkt = (cont_entry_t *)req->ring_ptr;
109 
110 	/* Load packet defaults. */
111 	*((uint32_t *)(&cont_pkt->entry_type)) = cpu_to_le32(CONTINUE_TYPE);
112 
113 	return (cont_pkt);
114 }
115 
116 /**
117  * qla2x00_prep_cont_type1_iocb() - Initialize a Continuation Type 1 IOCB.
118  * @ha: HA context
119  *
120  * Returns a pointer to the continuation type 1 IOCB packet.
121  */
122 static inline cont_a64_entry_t *
123 qla2x00_prep_cont_type1_iocb(scsi_qla_host_t *vha, struct req_que *req)
124 {
125 	cont_a64_entry_t *cont_pkt;
126 
127 	/* Adjust ring index. */
128 	req->ring_index++;
129 	if (req->ring_index == req->length) {
130 		req->ring_index = 0;
131 		req->ring_ptr = req->ring;
132 	} else {
133 		req->ring_ptr++;
134 	}
135 
136 	cont_pkt = (cont_a64_entry_t *)req->ring_ptr;
137 
138 	/* Load packet defaults. */
139 	*((uint32_t *)(&cont_pkt->entry_type)) = IS_QLAFX00(vha->hw) ?
140 	    cpu_to_le32(CONTINUE_A64_TYPE_FX00) :
141 	    cpu_to_le32(CONTINUE_A64_TYPE);
142 
143 	return (cont_pkt);
144 }
145 
146 static inline int
147 qla24xx_configure_prot_mode(srb_t *sp, uint16_t *fw_prot_opts)
148 {
149 	struct scsi_cmnd *cmd = GET_CMD_SP(sp);
150 	uint8_t	guard = scsi_host_get_guard(cmd->device->host);
151 
152 	/* We always use DIFF Bundling for best performance */
153 	*fw_prot_opts = 0;
154 
155 	/* Translate SCSI opcode to a protection opcode */
156 	switch (scsi_get_prot_op(cmd)) {
157 	case SCSI_PROT_READ_STRIP:
158 		*fw_prot_opts |= PO_MODE_DIF_REMOVE;
159 		break;
160 	case SCSI_PROT_WRITE_INSERT:
161 		*fw_prot_opts |= PO_MODE_DIF_INSERT;
162 		break;
163 	case SCSI_PROT_READ_INSERT:
164 		*fw_prot_opts |= PO_MODE_DIF_INSERT;
165 		break;
166 	case SCSI_PROT_WRITE_STRIP:
167 		*fw_prot_opts |= PO_MODE_DIF_REMOVE;
168 		break;
169 	case SCSI_PROT_READ_PASS:
170 	case SCSI_PROT_WRITE_PASS:
171 		if (guard & SHOST_DIX_GUARD_IP)
172 			*fw_prot_opts |= PO_MODE_DIF_TCP_CKSUM;
173 		else
174 			*fw_prot_opts |= PO_MODE_DIF_PASS;
175 		break;
176 	default:	/* Normal Request */
177 		*fw_prot_opts |= PO_MODE_DIF_PASS;
178 		break;
179 	}
180 
181 	return scsi_prot_sg_count(cmd);
182 }
183 
184 /*
185  * qla2x00_build_scsi_iocbs_32() - Build IOCB command utilizing 32bit
186  * capable IOCB types.
187  *
188  * @sp: SRB command to process
189  * @cmd_pkt: Command type 2 IOCB
190  * @tot_dsds: Total number of segments to transfer
191  */
192 void qla2x00_build_scsi_iocbs_32(srb_t *sp, cmd_entry_t *cmd_pkt,
193     uint16_t tot_dsds)
194 {
195 	uint16_t	avail_dsds;
196 	uint32_t	*cur_dsd;
197 	scsi_qla_host_t	*vha;
198 	struct scsi_cmnd *cmd;
199 	struct scatterlist *sg;
200 	int i;
201 
202 	cmd = GET_CMD_SP(sp);
203 
204 	/* Update entry type to indicate Command Type 2 IOCB */
205 	*((uint32_t *)(&cmd_pkt->entry_type)) =
206 	    cpu_to_le32(COMMAND_TYPE);
207 
208 	/* No data transfer */
209 	if (!scsi_bufflen(cmd) || cmd->sc_data_direction == DMA_NONE) {
210 		cmd_pkt->byte_count = cpu_to_le32(0);
211 		return;
212 	}
213 
214 	vha = sp->fcport->vha;
215 	cmd_pkt->control_flags |= cpu_to_le16(qla2x00_get_cmd_direction(sp));
216 
217 	/* Three DSDs are available in the Command Type 2 IOCB */
218 	avail_dsds = 3;
219 	cur_dsd = (uint32_t *)&cmd_pkt->dseg_0_address;
220 
221 	/* Load data segments */
222 	scsi_for_each_sg(cmd, sg, tot_dsds, i) {
223 		cont_entry_t *cont_pkt;
224 
225 		/* Allocate additional continuation packets? */
226 		if (avail_dsds == 0) {
227 			/*
228 			 * Seven DSDs are available in the Continuation
229 			 * Type 0 IOCB.
230 			 */
231 			cont_pkt = qla2x00_prep_cont_type0_iocb(vha);
232 			cur_dsd = (uint32_t *)&cont_pkt->dseg_0_address;
233 			avail_dsds = 7;
234 		}
235 
236 		*cur_dsd++ = cpu_to_le32(sg_dma_address(sg));
237 		*cur_dsd++ = cpu_to_le32(sg_dma_len(sg));
238 		avail_dsds--;
239 	}
240 }
241 
242 /**
243  * qla2x00_build_scsi_iocbs_64() - Build IOCB command utilizing 64bit
244  * capable IOCB types.
245  *
246  * @sp: SRB command to process
247  * @cmd_pkt: Command type 3 IOCB
248  * @tot_dsds: Total number of segments to transfer
249  */
250 void qla2x00_build_scsi_iocbs_64(srb_t *sp, cmd_entry_t *cmd_pkt,
251     uint16_t tot_dsds)
252 {
253 	uint16_t	avail_dsds;
254 	uint32_t	*cur_dsd;
255 	scsi_qla_host_t	*vha;
256 	struct scsi_cmnd *cmd;
257 	struct scatterlist *sg;
258 	int i;
259 
260 	cmd = GET_CMD_SP(sp);
261 
262 	/* Update entry type to indicate Command Type 3 IOCB */
263 	*((uint32_t *)(&cmd_pkt->entry_type)) = cpu_to_le32(COMMAND_A64_TYPE);
264 
265 	/* No data transfer */
266 	if (!scsi_bufflen(cmd) || cmd->sc_data_direction == DMA_NONE) {
267 		cmd_pkt->byte_count = cpu_to_le32(0);
268 		return;
269 	}
270 
271 	vha = sp->fcport->vha;
272 	cmd_pkt->control_flags |= cpu_to_le16(qla2x00_get_cmd_direction(sp));
273 
274 	/* Two DSDs are available in the Command Type 3 IOCB */
275 	avail_dsds = 2;
276 	cur_dsd = (uint32_t *)&cmd_pkt->dseg_0_address;
277 
278 	/* Load data segments */
279 	scsi_for_each_sg(cmd, sg, tot_dsds, i) {
280 		dma_addr_t	sle_dma;
281 		cont_a64_entry_t *cont_pkt;
282 
283 		/* Allocate additional continuation packets? */
284 		if (avail_dsds == 0) {
285 			/*
286 			 * Five DSDs are available in the Continuation
287 			 * Type 1 IOCB.
288 			 */
289 			cont_pkt = qla2x00_prep_cont_type1_iocb(vha, vha->req);
290 			cur_dsd = (uint32_t *)cont_pkt->dseg_0_address;
291 			avail_dsds = 5;
292 		}
293 
294 		sle_dma = sg_dma_address(sg);
295 		*cur_dsd++ = cpu_to_le32(LSD(sle_dma));
296 		*cur_dsd++ = cpu_to_le32(MSD(sle_dma));
297 		*cur_dsd++ = cpu_to_le32(sg_dma_len(sg));
298 		avail_dsds--;
299 	}
300 }
301 
302 /**
303  * qla2x00_start_scsi() - Send a SCSI command to the ISP
304  * @sp: command to send to the ISP
305  *
306  * Returns non-zero if a failure occurred, else zero.
307  */
308 int
309 qla2x00_start_scsi(srb_t *sp)
310 {
311 	int		nseg;
312 	unsigned long   flags;
313 	scsi_qla_host_t	*vha;
314 	struct scsi_cmnd *cmd;
315 	uint32_t	*clr_ptr;
316 	uint32_t        index;
317 	uint32_t	handle;
318 	cmd_entry_t	*cmd_pkt;
319 	uint16_t	cnt;
320 	uint16_t	req_cnt;
321 	uint16_t	tot_dsds;
322 	struct device_reg_2xxx __iomem *reg;
323 	struct qla_hw_data *ha;
324 	struct req_que *req;
325 	struct rsp_que *rsp;
326 
327 	/* Setup device pointers. */
328 	vha = sp->fcport->vha;
329 	ha = vha->hw;
330 	reg = &ha->iobase->isp;
331 	cmd = GET_CMD_SP(sp);
332 	req = ha->req_q_map[0];
333 	rsp = ha->rsp_q_map[0];
334 	/* So we know we haven't pci_map'ed anything yet */
335 	tot_dsds = 0;
336 
337 	/* Send marker if required */
338 	if (vha->marker_needed != 0) {
339 		if (qla2x00_marker(vha, req, rsp, 0, 0, MK_SYNC_ALL) !=
340 		    QLA_SUCCESS) {
341 			return (QLA_FUNCTION_FAILED);
342 		}
343 		vha->marker_needed = 0;
344 	}
345 
346 	/* Acquire ring specific lock */
347 	spin_lock_irqsave(&ha->hardware_lock, flags);
348 
349 	/* Check for room in outstanding command list. */
350 	handle = req->current_outstanding_cmd;
351 	for (index = 1; index < req->num_outstanding_cmds; index++) {
352 		handle++;
353 		if (handle == req->num_outstanding_cmds)
354 			handle = 1;
355 		if (!req->outstanding_cmds[handle])
356 			break;
357 	}
358 	if (index == req->num_outstanding_cmds)
359 		goto queuing_error;
360 
361 	/* Map the sg table so we have an accurate count of sg entries needed */
362 	if (scsi_sg_count(cmd)) {
363 		nseg = dma_map_sg(&ha->pdev->dev, scsi_sglist(cmd),
364 		    scsi_sg_count(cmd), cmd->sc_data_direction);
365 		if (unlikely(!nseg))
366 			goto queuing_error;
367 	} else
368 		nseg = 0;
369 
370 	tot_dsds = nseg;
371 
372 	/* Calculate the number of request entries needed. */
373 	req_cnt = ha->isp_ops->calc_req_entries(tot_dsds);
374 	if (req->cnt < (req_cnt + 2)) {
375 		cnt = RD_REG_WORD_RELAXED(ISP_REQ_Q_OUT(ha, reg));
376 		if (req->ring_index < cnt)
377 			req->cnt = cnt - req->ring_index;
378 		else
379 			req->cnt = req->length -
380 			    (req->ring_index - cnt);
381 		/* If still no head room then bail out */
382 		if (req->cnt < (req_cnt + 2))
383 			goto queuing_error;
384 	}
385 
386 	/* Build command packet */
387 	req->current_outstanding_cmd = handle;
388 	req->outstanding_cmds[handle] = sp;
389 	sp->handle = handle;
390 	cmd->host_scribble = (unsigned char *)(unsigned long)handle;
391 	req->cnt -= req_cnt;
392 
393 	cmd_pkt = (cmd_entry_t *)req->ring_ptr;
394 	cmd_pkt->handle = handle;
395 	/* Zero out remaining portion of packet. */
396 	clr_ptr = (uint32_t *)cmd_pkt + 2;
397 	memset(clr_ptr, 0, REQUEST_ENTRY_SIZE - 8);
398 	cmd_pkt->dseg_count = cpu_to_le16(tot_dsds);
399 
400 	/* Set target ID and LUN number*/
401 	SET_TARGET_ID(ha, cmd_pkt->target, sp->fcport->loop_id);
402 	cmd_pkt->lun = cpu_to_le16(cmd->device->lun);
403 	cmd_pkt->control_flags = cpu_to_le16(CF_SIMPLE_TAG);
404 
405 	/* Load SCSI command packet. */
406 	memcpy(cmd_pkt->scsi_cdb, cmd->cmnd, cmd->cmd_len);
407 	cmd_pkt->byte_count = cpu_to_le32((uint32_t)scsi_bufflen(cmd));
408 
409 	/* Build IOCB segments */
410 	ha->isp_ops->build_iocbs(sp, cmd_pkt, tot_dsds);
411 
412 	/* Set total data segment count. */
413 	cmd_pkt->entry_count = (uint8_t)req_cnt;
414 	wmb();
415 
416 	/* Adjust ring index. */
417 	req->ring_index++;
418 	if (req->ring_index == req->length) {
419 		req->ring_index = 0;
420 		req->ring_ptr = req->ring;
421 	} else
422 		req->ring_ptr++;
423 
424 	sp->flags |= SRB_DMA_VALID;
425 
426 	/* Set chip new ring index. */
427 	WRT_REG_WORD(ISP_REQ_Q_IN(ha, reg), req->ring_index);
428 	RD_REG_WORD_RELAXED(ISP_REQ_Q_IN(ha, reg));	/* PCI Posting. */
429 
430 	/* Manage unprocessed RIO/ZIO commands in response queue. */
431 	if (vha->flags.process_response_queue &&
432 	    rsp->ring_ptr->signature != RESPONSE_PROCESSED)
433 		qla2x00_process_response_queue(rsp);
434 
435 	spin_unlock_irqrestore(&ha->hardware_lock, flags);
436 	return (QLA_SUCCESS);
437 
438 queuing_error:
439 	if (tot_dsds)
440 		scsi_dma_unmap(cmd);
441 
442 	spin_unlock_irqrestore(&ha->hardware_lock, flags);
443 
444 	return (QLA_FUNCTION_FAILED);
445 }
446 
447 /**
448  * qla2x00_start_iocbs() - Execute the IOCB command
449  */
450 void
451 qla2x00_start_iocbs(struct scsi_qla_host *vha, struct req_que *req)
452 {
453 	struct qla_hw_data *ha = vha->hw;
454 	device_reg_t *reg = ISP_QUE_REG(ha, req->id);
455 
456 	if (IS_P3P_TYPE(ha)) {
457 		qla82xx_start_iocbs(vha);
458 	} else {
459 		/* Adjust ring index. */
460 		req->ring_index++;
461 		if (req->ring_index == req->length) {
462 			req->ring_index = 0;
463 			req->ring_ptr = req->ring;
464 		} else
465 			req->ring_ptr++;
466 
467 		/* Set chip new ring index. */
468 		if (ha->mqenable || IS_QLA83XX(ha) || IS_QLA27XX(ha)) {
469 			WRT_REG_DWORD(req->req_q_in, req->ring_index);
470 			RD_REG_DWORD_RELAXED(&ha->iobase->isp24.hccr);
471 		} else if (IS_QLAFX00(ha)) {
472 			WRT_REG_DWORD(&reg->ispfx00.req_q_in, req->ring_index);
473 			RD_REG_DWORD_RELAXED(&reg->ispfx00.req_q_in);
474 			QLAFX00_SET_HST_INTR(ha, ha->rqstq_intr_code);
475 		} else if (IS_FWI2_CAPABLE(ha)) {
476 			WRT_REG_DWORD(&reg->isp24.req_q_in, req->ring_index);
477 			RD_REG_DWORD_RELAXED(&reg->isp24.req_q_in);
478 		} else {
479 			WRT_REG_WORD(ISP_REQ_Q_IN(ha, &reg->isp),
480 				req->ring_index);
481 			RD_REG_WORD_RELAXED(ISP_REQ_Q_IN(ha, &reg->isp));
482 		}
483 	}
484 }
485 
486 /**
487  * qla2x00_marker() - Send a marker IOCB to the firmware.
488  * @ha: HA context
489  * @loop_id: loop ID
490  * @lun: LUN
491  * @type: marker modifier
492  *
493  * Can be called from both normal and interrupt context.
494  *
495  * Returns non-zero if a failure occurred, else zero.
496  */
497 static int
498 __qla2x00_marker(struct scsi_qla_host *vha, struct req_que *req,
499 			struct rsp_que *rsp, uint16_t loop_id,
500 			uint64_t lun, uint8_t type)
501 {
502 	mrk_entry_t *mrk;
503 	struct mrk_entry_24xx *mrk24 = NULL;
504 
505 	struct qla_hw_data *ha = vha->hw;
506 	scsi_qla_host_t *base_vha = pci_get_drvdata(ha->pdev);
507 
508 	req = ha->req_q_map[0];
509 	mrk = (mrk_entry_t *)qla2x00_alloc_iocbs(vha, NULL);
510 	if (mrk == NULL) {
511 		ql_log(ql_log_warn, base_vha, 0x3026,
512 		    "Failed to allocate Marker IOCB.\n");
513 
514 		return (QLA_FUNCTION_FAILED);
515 	}
516 
517 	mrk->entry_type = MARKER_TYPE;
518 	mrk->modifier = type;
519 	if (type != MK_SYNC_ALL) {
520 		if (IS_FWI2_CAPABLE(ha)) {
521 			mrk24 = (struct mrk_entry_24xx *) mrk;
522 			mrk24->nport_handle = cpu_to_le16(loop_id);
523 			int_to_scsilun(lun, (struct scsi_lun *)&mrk24->lun);
524 			host_to_fcp_swap(mrk24->lun, sizeof(mrk24->lun));
525 			mrk24->vp_index = vha->vp_idx;
526 			mrk24->handle = MAKE_HANDLE(req->id, mrk24->handle);
527 		} else {
528 			SET_TARGET_ID(ha, mrk->target, loop_id);
529 			mrk->lun = cpu_to_le16((uint16_t)lun);
530 		}
531 	}
532 	wmb();
533 
534 	qla2x00_start_iocbs(vha, req);
535 
536 	return (QLA_SUCCESS);
537 }
538 
539 int
540 qla2x00_marker(struct scsi_qla_host *vha, struct req_que *req,
541 		struct rsp_que *rsp, uint16_t loop_id, uint64_t lun,
542 		uint8_t type)
543 {
544 	int ret;
545 	unsigned long flags = 0;
546 
547 	spin_lock_irqsave(&vha->hw->hardware_lock, flags);
548 	ret = __qla2x00_marker(vha, req, rsp, loop_id, lun, type);
549 	spin_unlock_irqrestore(&vha->hw->hardware_lock, flags);
550 
551 	return (ret);
552 }
553 
554 /*
555  * qla2x00_issue_marker
556  *
557  * Issue marker
558  * Caller CAN have hardware lock held as specified by ha_locked parameter.
559  * Might release it, then reaquire.
560  */
561 int qla2x00_issue_marker(scsi_qla_host_t *vha, int ha_locked)
562 {
563 	if (ha_locked) {
564 		if (__qla2x00_marker(vha, vha->req, vha->req->rsp, 0, 0,
565 					MK_SYNC_ALL) != QLA_SUCCESS)
566 			return QLA_FUNCTION_FAILED;
567 	} else {
568 		if (qla2x00_marker(vha, vha->req, vha->req->rsp, 0, 0,
569 					MK_SYNC_ALL) != QLA_SUCCESS)
570 			return QLA_FUNCTION_FAILED;
571 	}
572 	vha->marker_needed = 0;
573 
574 	return QLA_SUCCESS;
575 }
576 
577 static inline int
578 qla24xx_build_scsi_type_6_iocbs(srb_t *sp, struct cmd_type_6 *cmd_pkt,
579 	uint16_t tot_dsds)
580 {
581 	uint32_t *cur_dsd = NULL;
582 	scsi_qla_host_t	*vha;
583 	struct qla_hw_data *ha;
584 	struct scsi_cmnd *cmd;
585 	struct	scatterlist *cur_seg;
586 	uint32_t *dsd_seg;
587 	void *next_dsd;
588 	uint8_t avail_dsds;
589 	uint8_t first_iocb = 1;
590 	uint32_t dsd_list_len;
591 	struct dsd_dma *dsd_ptr;
592 	struct ct6_dsd *ctx;
593 
594 	cmd = GET_CMD_SP(sp);
595 
596 	/* Update entry type to indicate Command Type 3 IOCB */
597 	*((uint32_t *)(&cmd_pkt->entry_type)) = cpu_to_le32(COMMAND_TYPE_6);
598 
599 	/* No data transfer */
600 	if (!scsi_bufflen(cmd) || cmd->sc_data_direction == DMA_NONE) {
601 		cmd_pkt->byte_count = cpu_to_le32(0);
602 		return 0;
603 	}
604 
605 	vha = sp->fcport->vha;
606 	ha = vha->hw;
607 
608 	/* Set transfer direction */
609 	if (cmd->sc_data_direction == DMA_TO_DEVICE) {
610 		cmd_pkt->control_flags = cpu_to_le16(CF_WRITE_DATA);
611 		vha->qla_stats.output_bytes += scsi_bufflen(cmd);
612 		vha->qla_stats.output_requests++;
613 	} else if (cmd->sc_data_direction == DMA_FROM_DEVICE) {
614 		cmd_pkt->control_flags = cpu_to_le16(CF_READ_DATA);
615 		vha->qla_stats.input_bytes += scsi_bufflen(cmd);
616 		vha->qla_stats.input_requests++;
617 	}
618 
619 	cur_seg = scsi_sglist(cmd);
620 	ctx = GET_CMD_CTX_SP(sp);
621 
622 	while (tot_dsds) {
623 		avail_dsds = (tot_dsds > QLA_DSDS_PER_IOCB) ?
624 		    QLA_DSDS_PER_IOCB : tot_dsds;
625 		tot_dsds -= avail_dsds;
626 		dsd_list_len = (avail_dsds + 1) * QLA_DSD_SIZE;
627 
628 		dsd_ptr = list_first_entry(&ha->gbl_dsd_list,
629 		    struct dsd_dma, list);
630 		next_dsd = dsd_ptr->dsd_addr;
631 		list_del(&dsd_ptr->list);
632 		ha->gbl_dsd_avail--;
633 		list_add_tail(&dsd_ptr->list, &ctx->dsd_list);
634 		ctx->dsd_use_cnt++;
635 		ha->gbl_dsd_inuse++;
636 
637 		if (first_iocb) {
638 			first_iocb = 0;
639 			dsd_seg = (uint32_t *)&cmd_pkt->fcp_data_dseg_address;
640 			*dsd_seg++ = cpu_to_le32(LSD(dsd_ptr->dsd_list_dma));
641 			*dsd_seg++ = cpu_to_le32(MSD(dsd_ptr->dsd_list_dma));
642 			cmd_pkt->fcp_data_dseg_len = cpu_to_le32(dsd_list_len);
643 		} else {
644 			*cur_dsd++ = cpu_to_le32(LSD(dsd_ptr->dsd_list_dma));
645 			*cur_dsd++ = cpu_to_le32(MSD(dsd_ptr->dsd_list_dma));
646 			*cur_dsd++ = cpu_to_le32(dsd_list_len);
647 		}
648 		cur_dsd = (uint32_t *)next_dsd;
649 		while (avail_dsds) {
650 			dma_addr_t	sle_dma;
651 
652 			sle_dma = sg_dma_address(cur_seg);
653 			*cur_dsd++ = cpu_to_le32(LSD(sle_dma));
654 			*cur_dsd++ = cpu_to_le32(MSD(sle_dma));
655 			*cur_dsd++ = cpu_to_le32(sg_dma_len(cur_seg));
656 			cur_seg = sg_next(cur_seg);
657 			avail_dsds--;
658 		}
659 	}
660 
661 	/* Null termination */
662 	*cur_dsd++ =  0;
663 	*cur_dsd++ = 0;
664 	*cur_dsd++ = 0;
665 	cmd_pkt->control_flags |= CF_DATA_SEG_DESCR_ENABLE;
666 	return 0;
667 }
668 
669 /*
670  * qla24xx_calc_dsd_lists() - Determine number of DSD list required
671  * for Command Type 6.
672  *
673  * @dsds: number of data segment decriptors needed
674  *
675  * Returns the number of dsd list needed to store @dsds.
676  */
677 static inline uint16_t
678 qla24xx_calc_dsd_lists(uint16_t dsds)
679 {
680 	uint16_t dsd_lists = 0;
681 
682 	dsd_lists = (dsds/QLA_DSDS_PER_IOCB);
683 	if (dsds % QLA_DSDS_PER_IOCB)
684 		dsd_lists++;
685 	return dsd_lists;
686 }
687 
688 
689 /**
690  * qla24xx_build_scsi_iocbs() - Build IOCB command utilizing Command Type 7
691  * IOCB types.
692  *
693  * @sp: SRB command to process
694  * @cmd_pkt: Command type 3 IOCB
695  * @tot_dsds: Total number of segments to transfer
696  */
697 static inline void
698 qla24xx_build_scsi_iocbs(srb_t *sp, struct cmd_type_7 *cmd_pkt,
699     uint16_t tot_dsds)
700 {
701 	uint16_t	avail_dsds;
702 	uint32_t	*cur_dsd;
703 	scsi_qla_host_t	*vha;
704 	struct scsi_cmnd *cmd;
705 	struct scatterlist *sg;
706 	int i;
707 
708 	cmd = GET_CMD_SP(sp);
709 
710 	/* Update entry type to indicate Command Type 3 IOCB */
711 	*((uint32_t *)(&cmd_pkt->entry_type)) = cpu_to_le32(COMMAND_TYPE_7);
712 
713 	/* No data transfer */
714 	if (!scsi_bufflen(cmd) || cmd->sc_data_direction == DMA_NONE) {
715 		cmd_pkt->byte_count = cpu_to_le32(0);
716 		return;
717 	}
718 
719 	vha = sp->fcport->vha;
720 
721 	/* Set transfer direction */
722 	if (cmd->sc_data_direction == DMA_TO_DEVICE) {
723 		cmd_pkt->task_mgmt_flags = cpu_to_le16(TMF_WRITE_DATA);
724 		vha->qla_stats.output_bytes += scsi_bufflen(cmd);
725 		vha->qla_stats.output_requests++;
726 	} else if (cmd->sc_data_direction == DMA_FROM_DEVICE) {
727 		cmd_pkt->task_mgmt_flags = cpu_to_le16(TMF_READ_DATA);
728 		vha->qla_stats.input_bytes += scsi_bufflen(cmd);
729 		vha->qla_stats.input_requests++;
730 	}
731 
732 	/* One DSD is available in the Command Type 3 IOCB */
733 	avail_dsds = 1;
734 	cur_dsd = (uint32_t *)&cmd_pkt->dseg_0_address;
735 
736 	/* Load data segments */
737 
738 	scsi_for_each_sg(cmd, sg, tot_dsds, i) {
739 		dma_addr_t	sle_dma;
740 		cont_a64_entry_t *cont_pkt;
741 
742 		/* Allocate additional continuation packets? */
743 		if (avail_dsds == 0) {
744 			/*
745 			 * Five DSDs are available in the Continuation
746 			 * Type 1 IOCB.
747 			 */
748 			cont_pkt = qla2x00_prep_cont_type1_iocb(vha, vha->req);
749 			cur_dsd = (uint32_t *)cont_pkt->dseg_0_address;
750 			avail_dsds = 5;
751 		}
752 
753 		sle_dma = sg_dma_address(sg);
754 		*cur_dsd++ = cpu_to_le32(LSD(sle_dma));
755 		*cur_dsd++ = cpu_to_le32(MSD(sle_dma));
756 		*cur_dsd++ = cpu_to_le32(sg_dma_len(sg));
757 		avail_dsds--;
758 	}
759 }
760 
761 struct fw_dif_context {
762 	uint32_t ref_tag;
763 	uint16_t app_tag;
764 	uint8_t ref_tag_mask[4];	/* Validation/Replacement Mask*/
765 	uint8_t app_tag_mask[2];	/* Validation/Replacement Mask*/
766 };
767 
768 /*
769  * qla24xx_set_t10dif_tags_from_cmd - Extract Ref and App tags from SCSI command
770  *
771  */
772 static inline void
773 qla24xx_set_t10dif_tags(srb_t *sp, struct fw_dif_context *pkt,
774     unsigned int protcnt)
775 {
776 	struct scsi_cmnd *cmd = GET_CMD_SP(sp);
777 
778 	switch (scsi_get_prot_type(cmd)) {
779 	case SCSI_PROT_DIF_TYPE0:
780 		/*
781 		 * No check for ql2xenablehba_err_chk, as it would be an
782 		 * I/O error if hba tag generation is not done.
783 		 */
784 		pkt->ref_tag = cpu_to_le32((uint32_t)
785 		    (0xffffffff & scsi_get_lba(cmd)));
786 
787 		if (!qla2x00_hba_err_chk_enabled(sp))
788 			break;
789 
790 		pkt->ref_tag_mask[0] = 0xff;
791 		pkt->ref_tag_mask[1] = 0xff;
792 		pkt->ref_tag_mask[2] = 0xff;
793 		pkt->ref_tag_mask[3] = 0xff;
794 		break;
795 
796 	/*
797 	 * For TYPE 2 protection: 16 bit GUARD + 32 bit REF tag has to
798 	 * match LBA in CDB + N
799 	 */
800 	case SCSI_PROT_DIF_TYPE2:
801 		pkt->app_tag = cpu_to_le16(0);
802 		pkt->app_tag_mask[0] = 0x0;
803 		pkt->app_tag_mask[1] = 0x0;
804 
805 		pkt->ref_tag = cpu_to_le32((uint32_t)
806 		    (0xffffffff & scsi_get_lba(cmd)));
807 
808 		if (!qla2x00_hba_err_chk_enabled(sp))
809 			break;
810 
811 		/* enable ALL bytes of the ref tag */
812 		pkt->ref_tag_mask[0] = 0xff;
813 		pkt->ref_tag_mask[1] = 0xff;
814 		pkt->ref_tag_mask[2] = 0xff;
815 		pkt->ref_tag_mask[3] = 0xff;
816 		break;
817 
818 	/* For Type 3 protection: 16 bit GUARD only */
819 	case SCSI_PROT_DIF_TYPE3:
820 		pkt->ref_tag_mask[0] = pkt->ref_tag_mask[1] =
821 			pkt->ref_tag_mask[2] = pkt->ref_tag_mask[3] =
822 								0x00;
823 		break;
824 
825 	/*
826 	 * For TYpe 1 protection: 16 bit GUARD tag, 32 bit REF tag, and
827 	 * 16 bit app tag.
828 	 */
829 	case SCSI_PROT_DIF_TYPE1:
830 		pkt->ref_tag = cpu_to_le32((uint32_t)
831 		    (0xffffffff & scsi_get_lba(cmd)));
832 		pkt->app_tag = cpu_to_le16(0);
833 		pkt->app_tag_mask[0] = 0x0;
834 		pkt->app_tag_mask[1] = 0x0;
835 
836 		if (!qla2x00_hba_err_chk_enabled(sp))
837 			break;
838 
839 		/* enable ALL bytes of the ref tag */
840 		pkt->ref_tag_mask[0] = 0xff;
841 		pkt->ref_tag_mask[1] = 0xff;
842 		pkt->ref_tag_mask[2] = 0xff;
843 		pkt->ref_tag_mask[3] = 0xff;
844 		break;
845 	}
846 }
847 
848 struct qla2_sgx {
849 	dma_addr_t		dma_addr;	/* OUT */
850 	uint32_t		dma_len;	/* OUT */
851 
852 	uint32_t		tot_bytes;	/* IN */
853 	struct scatterlist	*cur_sg;	/* IN */
854 
855 	/* for book keeping, bzero on initial invocation */
856 	uint32_t		bytes_consumed;
857 	uint32_t		num_bytes;
858 	uint32_t		tot_partial;
859 
860 	/* for debugging */
861 	uint32_t		num_sg;
862 	srb_t			*sp;
863 };
864 
865 static int
866 qla24xx_get_one_block_sg(uint32_t blk_sz, struct qla2_sgx *sgx,
867 	uint32_t *partial)
868 {
869 	struct scatterlist *sg;
870 	uint32_t cumulative_partial, sg_len;
871 	dma_addr_t sg_dma_addr;
872 
873 	if (sgx->num_bytes == sgx->tot_bytes)
874 		return 0;
875 
876 	sg = sgx->cur_sg;
877 	cumulative_partial = sgx->tot_partial;
878 
879 	sg_dma_addr = sg_dma_address(sg);
880 	sg_len = sg_dma_len(sg);
881 
882 	sgx->dma_addr = sg_dma_addr + sgx->bytes_consumed;
883 
884 	if ((cumulative_partial + (sg_len - sgx->bytes_consumed)) >= blk_sz) {
885 		sgx->dma_len = (blk_sz - cumulative_partial);
886 		sgx->tot_partial = 0;
887 		sgx->num_bytes += blk_sz;
888 		*partial = 0;
889 	} else {
890 		sgx->dma_len = sg_len - sgx->bytes_consumed;
891 		sgx->tot_partial += sgx->dma_len;
892 		*partial = 1;
893 	}
894 
895 	sgx->bytes_consumed += sgx->dma_len;
896 
897 	if (sg_len == sgx->bytes_consumed) {
898 		sg = sg_next(sg);
899 		sgx->num_sg++;
900 		sgx->cur_sg = sg;
901 		sgx->bytes_consumed = 0;
902 	}
903 
904 	return 1;
905 }
906 
907 int
908 qla24xx_walk_and_build_sglist_no_difb(struct qla_hw_data *ha, srb_t *sp,
909 	uint32_t *dsd, uint16_t tot_dsds, struct qla_tgt_cmd *tc)
910 {
911 	void *next_dsd;
912 	uint8_t avail_dsds = 0;
913 	uint32_t dsd_list_len;
914 	struct dsd_dma *dsd_ptr;
915 	struct scatterlist *sg_prot;
916 	uint32_t *cur_dsd = dsd;
917 	uint16_t	used_dsds = tot_dsds;
918 
919 	uint32_t	prot_int; /* protection interval */
920 	uint32_t	partial;
921 	struct qla2_sgx sgx;
922 	dma_addr_t	sle_dma;
923 	uint32_t	sle_dma_len, tot_prot_dma_len = 0;
924 	struct scsi_cmnd *cmd;
925 
926 	memset(&sgx, 0, sizeof(struct qla2_sgx));
927 	if (sp) {
928 		cmd = GET_CMD_SP(sp);
929 		prot_int = cmd->device->sector_size;
930 
931 		sgx.tot_bytes = scsi_bufflen(cmd);
932 		sgx.cur_sg = scsi_sglist(cmd);
933 		sgx.sp = sp;
934 
935 		sg_prot = scsi_prot_sglist(cmd);
936 	} else if (tc) {
937 		prot_int      = tc->blk_sz;
938 		sgx.tot_bytes = tc->bufflen;
939 		sgx.cur_sg    = tc->sg;
940 		sg_prot	      = tc->prot_sg;
941 	} else {
942 		BUG();
943 		return 1;
944 	}
945 
946 	while (qla24xx_get_one_block_sg(prot_int, &sgx, &partial)) {
947 
948 		sle_dma = sgx.dma_addr;
949 		sle_dma_len = sgx.dma_len;
950 alloc_and_fill:
951 		/* Allocate additional continuation packets? */
952 		if (avail_dsds == 0) {
953 			avail_dsds = (used_dsds > QLA_DSDS_PER_IOCB) ?
954 					QLA_DSDS_PER_IOCB : used_dsds;
955 			dsd_list_len = (avail_dsds + 1) * 12;
956 			used_dsds -= avail_dsds;
957 
958 			/* allocate tracking DS */
959 			dsd_ptr = kzalloc(sizeof(struct dsd_dma), GFP_ATOMIC);
960 			if (!dsd_ptr)
961 				return 1;
962 
963 			/* allocate new list */
964 			dsd_ptr->dsd_addr = next_dsd =
965 			    dma_pool_alloc(ha->dl_dma_pool, GFP_ATOMIC,
966 				&dsd_ptr->dsd_list_dma);
967 
968 			if (!next_dsd) {
969 				/*
970 				 * Need to cleanup only this dsd_ptr, rest
971 				 * will be done by sp_free_dma()
972 				 */
973 				kfree(dsd_ptr);
974 				return 1;
975 			}
976 
977 			if (sp) {
978 				list_add_tail(&dsd_ptr->list,
979 				    &((struct crc_context *)
980 					    sp->u.scmd.ctx)->dsd_list);
981 
982 				sp->flags |= SRB_CRC_CTX_DSD_VALID;
983 			} else {
984 				list_add_tail(&dsd_ptr->list,
985 				    &(tc->ctx->dsd_list));
986 				tc->ctx_dsd_alloced = 1;
987 			}
988 
989 
990 			/* add new list to cmd iocb or last list */
991 			*cur_dsd++ = cpu_to_le32(LSD(dsd_ptr->dsd_list_dma));
992 			*cur_dsd++ = cpu_to_le32(MSD(dsd_ptr->dsd_list_dma));
993 			*cur_dsd++ = dsd_list_len;
994 			cur_dsd = (uint32_t *)next_dsd;
995 		}
996 		*cur_dsd++ = cpu_to_le32(LSD(sle_dma));
997 		*cur_dsd++ = cpu_to_le32(MSD(sle_dma));
998 		*cur_dsd++ = cpu_to_le32(sle_dma_len);
999 		avail_dsds--;
1000 
1001 		if (partial == 0) {
1002 			/* Got a full protection interval */
1003 			sle_dma = sg_dma_address(sg_prot) + tot_prot_dma_len;
1004 			sle_dma_len = 8;
1005 
1006 			tot_prot_dma_len += sle_dma_len;
1007 			if (tot_prot_dma_len == sg_dma_len(sg_prot)) {
1008 				tot_prot_dma_len = 0;
1009 				sg_prot = sg_next(sg_prot);
1010 			}
1011 
1012 			partial = 1; /* So as to not re-enter this block */
1013 			goto alloc_and_fill;
1014 		}
1015 	}
1016 	/* Null termination */
1017 	*cur_dsd++ = 0;
1018 	*cur_dsd++ = 0;
1019 	*cur_dsd++ = 0;
1020 	return 0;
1021 }
1022 
1023 int
1024 qla24xx_walk_and_build_sglist(struct qla_hw_data *ha, srb_t *sp, uint32_t *dsd,
1025 	uint16_t tot_dsds, struct qla_tgt_cmd *tc)
1026 {
1027 	void *next_dsd;
1028 	uint8_t avail_dsds = 0;
1029 	uint32_t dsd_list_len;
1030 	struct dsd_dma *dsd_ptr;
1031 	struct scatterlist *sg, *sgl;
1032 	uint32_t *cur_dsd = dsd;
1033 	int	i;
1034 	uint16_t	used_dsds = tot_dsds;
1035 	struct scsi_cmnd *cmd;
1036 
1037 	if (sp) {
1038 		cmd = GET_CMD_SP(sp);
1039 		sgl = scsi_sglist(cmd);
1040 	} else if (tc) {
1041 		sgl = tc->sg;
1042 	} else {
1043 		BUG();
1044 		return 1;
1045 	}
1046 
1047 
1048 	for_each_sg(sgl, sg, tot_dsds, i) {
1049 		dma_addr_t	sle_dma;
1050 
1051 		/* Allocate additional continuation packets? */
1052 		if (avail_dsds == 0) {
1053 			avail_dsds = (used_dsds > QLA_DSDS_PER_IOCB) ?
1054 					QLA_DSDS_PER_IOCB : used_dsds;
1055 			dsd_list_len = (avail_dsds + 1) * 12;
1056 			used_dsds -= avail_dsds;
1057 
1058 			/* allocate tracking DS */
1059 			dsd_ptr = kzalloc(sizeof(struct dsd_dma), GFP_ATOMIC);
1060 			if (!dsd_ptr)
1061 				return 1;
1062 
1063 			/* allocate new list */
1064 			dsd_ptr->dsd_addr = next_dsd =
1065 			    dma_pool_alloc(ha->dl_dma_pool, GFP_ATOMIC,
1066 				&dsd_ptr->dsd_list_dma);
1067 
1068 			if (!next_dsd) {
1069 				/*
1070 				 * Need to cleanup only this dsd_ptr, rest
1071 				 * will be done by sp_free_dma()
1072 				 */
1073 				kfree(dsd_ptr);
1074 				return 1;
1075 			}
1076 
1077 			if (sp) {
1078 				list_add_tail(&dsd_ptr->list,
1079 				    &((struct crc_context *)
1080 					    sp->u.scmd.ctx)->dsd_list);
1081 
1082 				sp->flags |= SRB_CRC_CTX_DSD_VALID;
1083 			} else {
1084 				list_add_tail(&dsd_ptr->list,
1085 				    &(tc->ctx->dsd_list));
1086 				tc->ctx_dsd_alloced = 1;
1087 			}
1088 
1089 			/* add new list to cmd iocb or last list */
1090 			*cur_dsd++ = cpu_to_le32(LSD(dsd_ptr->dsd_list_dma));
1091 			*cur_dsd++ = cpu_to_le32(MSD(dsd_ptr->dsd_list_dma));
1092 			*cur_dsd++ = dsd_list_len;
1093 			cur_dsd = (uint32_t *)next_dsd;
1094 		}
1095 		sle_dma = sg_dma_address(sg);
1096 
1097 		*cur_dsd++ = cpu_to_le32(LSD(sle_dma));
1098 		*cur_dsd++ = cpu_to_le32(MSD(sle_dma));
1099 		*cur_dsd++ = cpu_to_le32(sg_dma_len(sg));
1100 		avail_dsds--;
1101 
1102 	}
1103 	/* Null termination */
1104 	*cur_dsd++ = 0;
1105 	*cur_dsd++ = 0;
1106 	*cur_dsd++ = 0;
1107 	return 0;
1108 }
1109 
1110 int
1111 qla24xx_walk_and_build_prot_sglist(struct qla_hw_data *ha, srb_t *sp,
1112 	uint32_t *dsd, uint16_t tot_dsds, struct qla_tgt_cmd *tc)
1113 {
1114 	void *next_dsd;
1115 	uint8_t avail_dsds = 0;
1116 	uint32_t dsd_list_len;
1117 	struct dsd_dma *dsd_ptr;
1118 	struct scatterlist *sg, *sgl;
1119 	int	i;
1120 	struct scsi_cmnd *cmd;
1121 	uint32_t *cur_dsd = dsd;
1122 	uint16_t used_dsds = tot_dsds;
1123 	struct scsi_qla_host *vha;
1124 
1125 	if (sp) {
1126 		cmd = GET_CMD_SP(sp);
1127 		sgl = scsi_prot_sglist(cmd);
1128 		vha = sp->fcport->vha;
1129 	} else if (tc) {
1130 		vha = tc->vha;
1131 		sgl = tc->prot_sg;
1132 	} else {
1133 		BUG();
1134 		return 1;
1135 	}
1136 
1137 	ql_dbg(ql_dbg_tgt, vha, 0xe021,
1138 		"%s: enter\n", __func__);
1139 
1140 	for_each_sg(sgl, sg, tot_dsds, i) {
1141 		dma_addr_t	sle_dma;
1142 
1143 		/* Allocate additional continuation packets? */
1144 		if (avail_dsds == 0) {
1145 			avail_dsds = (used_dsds > QLA_DSDS_PER_IOCB) ?
1146 						QLA_DSDS_PER_IOCB : used_dsds;
1147 			dsd_list_len = (avail_dsds + 1) * 12;
1148 			used_dsds -= avail_dsds;
1149 
1150 			/* allocate tracking DS */
1151 			dsd_ptr = kzalloc(sizeof(struct dsd_dma), GFP_ATOMIC);
1152 			if (!dsd_ptr)
1153 				return 1;
1154 
1155 			/* allocate new list */
1156 			dsd_ptr->dsd_addr = next_dsd =
1157 			    dma_pool_alloc(ha->dl_dma_pool, GFP_ATOMIC,
1158 				&dsd_ptr->dsd_list_dma);
1159 
1160 			if (!next_dsd) {
1161 				/*
1162 				 * Need to cleanup only this dsd_ptr, rest
1163 				 * will be done by sp_free_dma()
1164 				 */
1165 				kfree(dsd_ptr);
1166 				return 1;
1167 			}
1168 
1169 			if (sp) {
1170 				list_add_tail(&dsd_ptr->list,
1171 				    &((struct crc_context *)
1172 					    sp->u.scmd.ctx)->dsd_list);
1173 
1174 				sp->flags |= SRB_CRC_CTX_DSD_VALID;
1175 			} else {
1176 				list_add_tail(&dsd_ptr->list,
1177 				    &(tc->ctx->dsd_list));
1178 				tc->ctx_dsd_alloced = 1;
1179 			}
1180 
1181 			/* add new list to cmd iocb or last list */
1182 			*cur_dsd++ = cpu_to_le32(LSD(dsd_ptr->dsd_list_dma));
1183 			*cur_dsd++ = cpu_to_le32(MSD(dsd_ptr->dsd_list_dma));
1184 			*cur_dsd++ = dsd_list_len;
1185 			cur_dsd = (uint32_t *)next_dsd;
1186 		}
1187 		sle_dma = sg_dma_address(sg);
1188 
1189 		*cur_dsd++ = cpu_to_le32(LSD(sle_dma));
1190 		*cur_dsd++ = cpu_to_le32(MSD(sle_dma));
1191 		*cur_dsd++ = cpu_to_le32(sg_dma_len(sg));
1192 
1193 		avail_dsds--;
1194 	}
1195 	/* Null termination */
1196 	*cur_dsd++ = 0;
1197 	*cur_dsd++ = 0;
1198 	*cur_dsd++ = 0;
1199 	return 0;
1200 }
1201 
1202 /**
1203  * qla24xx_build_scsi_crc_2_iocbs() - Build IOCB command utilizing Command
1204  *							Type 6 IOCB types.
1205  *
1206  * @sp: SRB command to process
1207  * @cmd_pkt: Command type 3 IOCB
1208  * @tot_dsds: Total number of segments to transfer
1209  */
1210 static inline int
1211 qla24xx_build_scsi_crc_2_iocbs(srb_t *sp, struct cmd_type_crc_2 *cmd_pkt,
1212     uint16_t tot_dsds, uint16_t tot_prot_dsds, uint16_t fw_prot_opts)
1213 {
1214 	uint32_t		*cur_dsd, *fcp_dl;
1215 	scsi_qla_host_t		*vha;
1216 	struct scsi_cmnd	*cmd;
1217 	uint32_t		total_bytes = 0;
1218 	uint32_t		data_bytes;
1219 	uint32_t		dif_bytes;
1220 	uint8_t			bundling = 1;
1221 	uint16_t		blk_size;
1222 	uint8_t			*clr_ptr;
1223 	struct crc_context	*crc_ctx_pkt = NULL;
1224 	struct qla_hw_data	*ha;
1225 	uint8_t			additional_fcpcdb_len;
1226 	uint16_t		fcp_cmnd_len;
1227 	struct fcp_cmnd		*fcp_cmnd;
1228 	dma_addr_t		crc_ctx_dma;
1229 
1230 	cmd = GET_CMD_SP(sp);
1231 
1232 	/* Update entry type to indicate Command Type CRC_2 IOCB */
1233 	*((uint32_t *)(&cmd_pkt->entry_type)) = cpu_to_le32(COMMAND_TYPE_CRC_2);
1234 
1235 	vha = sp->fcport->vha;
1236 	ha = vha->hw;
1237 
1238 	/* No data transfer */
1239 	data_bytes = scsi_bufflen(cmd);
1240 	if (!data_bytes || cmd->sc_data_direction == DMA_NONE) {
1241 		cmd_pkt->byte_count = cpu_to_le32(0);
1242 		return QLA_SUCCESS;
1243 	}
1244 
1245 	cmd_pkt->vp_index = sp->fcport->vha->vp_idx;
1246 
1247 	/* Set transfer direction */
1248 	if (cmd->sc_data_direction == DMA_TO_DEVICE) {
1249 		cmd_pkt->control_flags =
1250 		    cpu_to_le16(CF_WRITE_DATA);
1251 	} else if (cmd->sc_data_direction == DMA_FROM_DEVICE) {
1252 		cmd_pkt->control_flags =
1253 		    cpu_to_le16(CF_READ_DATA);
1254 	}
1255 
1256 	if ((scsi_get_prot_op(cmd) == SCSI_PROT_READ_INSERT) ||
1257 	    (scsi_get_prot_op(cmd) == SCSI_PROT_WRITE_STRIP) ||
1258 	    (scsi_get_prot_op(cmd) == SCSI_PROT_READ_STRIP) ||
1259 	    (scsi_get_prot_op(cmd) == SCSI_PROT_WRITE_INSERT))
1260 		bundling = 0;
1261 
1262 	/* Allocate CRC context from global pool */
1263 	crc_ctx_pkt = sp->u.scmd.ctx =
1264 	    dma_pool_alloc(ha->dl_dma_pool, GFP_ATOMIC, &crc_ctx_dma);
1265 
1266 	if (!crc_ctx_pkt)
1267 		goto crc_queuing_error;
1268 
1269 	/* Zero out CTX area. */
1270 	clr_ptr = (uint8_t *)crc_ctx_pkt;
1271 	memset(clr_ptr, 0, sizeof(*crc_ctx_pkt));
1272 
1273 	crc_ctx_pkt->crc_ctx_dma = crc_ctx_dma;
1274 
1275 	sp->flags |= SRB_CRC_CTX_DMA_VALID;
1276 
1277 	/* Set handle */
1278 	crc_ctx_pkt->handle = cmd_pkt->handle;
1279 
1280 	INIT_LIST_HEAD(&crc_ctx_pkt->dsd_list);
1281 
1282 	qla24xx_set_t10dif_tags(sp, (struct fw_dif_context *)
1283 	    &crc_ctx_pkt->ref_tag, tot_prot_dsds);
1284 
1285 	cmd_pkt->crc_context_address[0] = cpu_to_le32(LSD(crc_ctx_dma));
1286 	cmd_pkt->crc_context_address[1] = cpu_to_le32(MSD(crc_ctx_dma));
1287 	cmd_pkt->crc_context_len = CRC_CONTEXT_LEN_FW;
1288 
1289 	/* Determine SCSI command length -- align to 4 byte boundary */
1290 	if (cmd->cmd_len > 16) {
1291 		additional_fcpcdb_len = cmd->cmd_len - 16;
1292 		if ((cmd->cmd_len % 4) != 0) {
1293 			/* SCSI cmd > 16 bytes must be multiple of 4 */
1294 			goto crc_queuing_error;
1295 		}
1296 		fcp_cmnd_len = 12 + cmd->cmd_len + 4;
1297 	} else {
1298 		additional_fcpcdb_len = 0;
1299 		fcp_cmnd_len = 12 + 16 + 4;
1300 	}
1301 
1302 	fcp_cmnd = &crc_ctx_pkt->fcp_cmnd;
1303 
1304 	fcp_cmnd->additional_cdb_len = additional_fcpcdb_len;
1305 	if (cmd->sc_data_direction == DMA_TO_DEVICE)
1306 		fcp_cmnd->additional_cdb_len |= 1;
1307 	else if (cmd->sc_data_direction == DMA_FROM_DEVICE)
1308 		fcp_cmnd->additional_cdb_len |= 2;
1309 
1310 	int_to_scsilun(cmd->device->lun, &fcp_cmnd->lun);
1311 	memcpy(fcp_cmnd->cdb, cmd->cmnd, cmd->cmd_len);
1312 	cmd_pkt->fcp_cmnd_dseg_len = cpu_to_le16(fcp_cmnd_len);
1313 	cmd_pkt->fcp_cmnd_dseg_address[0] = cpu_to_le32(
1314 	    LSD(crc_ctx_dma + CRC_CONTEXT_FCPCMND_OFF));
1315 	cmd_pkt->fcp_cmnd_dseg_address[1] = cpu_to_le32(
1316 	    MSD(crc_ctx_dma + CRC_CONTEXT_FCPCMND_OFF));
1317 	fcp_cmnd->task_management = 0;
1318 	fcp_cmnd->task_attribute = TSK_SIMPLE;
1319 
1320 	cmd_pkt->fcp_rsp_dseg_len = 0; /* Let response come in status iocb */
1321 
1322 	/* Compute dif len and adjust data len to incude protection */
1323 	dif_bytes = 0;
1324 	blk_size = cmd->device->sector_size;
1325 	dif_bytes = (data_bytes / blk_size) * 8;
1326 
1327 	switch (scsi_get_prot_op(GET_CMD_SP(sp))) {
1328 	case SCSI_PROT_READ_INSERT:
1329 	case SCSI_PROT_WRITE_STRIP:
1330 	    total_bytes = data_bytes;
1331 	    data_bytes += dif_bytes;
1332 	    break;
1333 
1334 	case SCSI_PROT_READ_STRIP:
1335 	case SCSI_PROT_WRITE_INSERT:
1336 	case SCSI_PROT_READ_PASS:
1337 	case SCSI_PROT_WRITE_PASS:
1338 	    total_bytes = data_bytes + dif_bytes;
1339 	    break;
1340 	default:
1341 	    BUG();
1342 	}
1343 
1344 	if (!qla2x00_hba_err_chk_enabled(sp))
1345 		fw_prot_opts |= 0x10; /* Disable Guard tag checking */
1346 	/* HBA error checking enabled */
1347 	else if (IS_PI_UNINIT_CAPABLE(ha)) {
1348 		if ((scsi_get_prot_type(GET_CMD_SP(sp)) == SCSI_PROT_DIF_TYPE1)
1349 		    || (scsi_get_prot_type(GET_CMD_SP(sp)) ==
1350 			SCSI_PROT_DIF_TYPE2))
1351 			fw_prot_opts |= BIT_10;
1352 		else if (scsi_get_prot_type(GET_CMD_SP(sp)) ==
1353 		    SCSI_PROT_DIF_TYPE3)
1354 			fw_prot_opts |= BIT_11;
1355 	}
1356 
1357 	if (!bundling) {
1358 		cur_dsd = (uint32_t *) &crc_ctx_pkt->u.nobundling.data_address;
1359 	} else {
1360 		/*
1361 		 * Configure Bundling if we need to fetch interlaving
1362 		 * protection PCI accesses
1363 		 */
1364 		fw_prot_opts |= PO_ENABLE_DIF_BUNDLING;
1365 		crc_ctx_pkt->u.bundling.dif_byte_count = cpu_to_le32(dif_bytes);
1366 		crc_ctx_pkt->u.bundling.dseg_count = cpu_to_le16(tot_dsds -
1367 							tot_prot_dsds);
1368 		cur_dsd = (uint32_t *) &crc_ctx_pkt->u.bundling.data_address;
1369 	}
1370 
1371 	/* Finish the common fields of CRC pkt */
1372 	crc_ctx_pkt->blk_size = cpu_to_le16(blk_size);
1373 	crc_ctx_pkt->prot_opts = cpu_to_le16(fw_prot_opts);
1374 	crc_ctx_pkt->byte_count = cpu_to_le32(data_bytes);
1375 	crc_ctx_pkt->guard_seed = cpu_to_le16(0);
1376 	/* Fibre channel byte count */
1377 	cmd_pkt->byte_count = cpu_to_le32(total_bytes);
1378 	fcp_dl = (uint32_t *)(crc_ctx_pkt->fcp_cmnd.cdb + 16 +
1379 	    additional_fcpcdb_len);
1380 	*fcp_dl = htonl(total_bytes);
1381 
1382 	if (!data_bytes || cmd->sc_data_direction == DMA_NONE) {
1383 		cmd_pkt->byte_count = cpu_to_le32(0);
1384 		return QLA_SUCCESS;
1385 	}
1386 	/* Walks data segments */
1387 
1388 	cmd_pkt->control_flags |= cpu_to_le16(CF_DATA_SEG_DESCR_ENABLE);
1389 
1390 	if (!bundling && tot_prot_dsds) {
1391 		if (qla24xx_walk_and_build_sglist_no_difb(ha, sp,
1392 			cur_dsd, tot_dsds, NULL))
1393 			goto crc_queuing_error;
1394 	} else if (qla24xx_walk_and_build_sglist(ha, sp, cur_dsd,
1395 			(tot_dsds - tot_prot_dsds), NULL))
1396 		goto crc_queuing_error;
1397 
1398 	if (bundling && tot_prot_dsds) {
1399 		/* Walks dif segments */
1400 		cmd_pkt->control_flags |= cpu_to_le16(CF_DIF_SEG_DESCR_ENABLE);
1401 		cur_dsd = (uint32_t *) &crc_ctx_pkt->u.bundling.dif_address;
1402 		if (qla24xx_walk_and_build_prot_sglist(ha, sp, cur_dsd,
1403 				tot_prot_dsds, NULL))
1404 			goto crc_queuing_error;
1405 	}
1406 	return QLA_SUCCESS;
1407 
1408 crc_queuing_error:
1409 	/* Cleanup will be performed by the caller */
1410 
1411 	return QLA_FUNCTION_FAILED;
1412 }
1413 
1414 /**
1415  * qla24xx_start_scsi() - Send a SCSI command to the ISP
1416  * @sp: command to send to the ISP
1417  *
1418  * Returns non-zero if a failure occurred, else zero.
1419  */
1420 int
1421 qla24xx_start_scsi(srb_t *sp)
1422 {
1423 	int		nseg;
1424 	unsigned long   flags;
1425 	uint32_t	*clr_ptr;
1426 	uint32_t        index;
1427 	uint32_t	handle;
1428 	struct cmd_type_7 *cmd_pkt;
1429 	uint16_t	cnt;
1430 	uint16_t	req_cnt;
1431 	uint16_t	tot_dsds;
1432 	struct req_que *req = NULL;
1433 	struct rsp_que *rsp = NULL;
1434 	struct scsi_cmnd *cmd = GET_CMD_SP(sp);
1435 	struct scsi_qla_host *vha = sp->fcport->vha;
1436 	struct qla_hw_data *ha = vha->hw;
1437 
1438 	/* Setup device pointers. */
1439 	qla25xx_set_que(sp, &rsp);
1440 	req = vha->req;
1441 
1442 	/* So we know we haven't pci_map'ed anything yet */
1443 	tot_dsds = 0;
1444 
1445 	/* Send marker if required */
1446 	if (vha->marker_needed != 0) {
1447 		if (qla2x00_marker(vha, req, rsp, 0, 0, MK_SYNC_ALL) !=
1448 		    QLA_SUCCESS)
1449 			return QLA_FUNCTION_FAILED;
1450 		vha->marker_needed = 0;
1451 	}
1452 
1453 	/* Acquire ring specific lock */
1454 	spin_lock_irqsave(&ha->hardware_lock, flags);
1455 
1456 	/* Check for room in outstanding command list. */
1457 	handle = req->current_outstanding_cmd;
1458 	for (index = 1; index < req->num_outstanding_cmds; index++) {
1459 		handle++;
1460 		if (handle == req->num_outstanding_cmds)
1461 			handle = 1;
1462 		if (!req->outstanding_cmds[handle])
1463 			break;
1464 	}
1465 	if (index == req->num_outstanding_cmds)
1466 		goto queuing_error;
1467 
1468 	/* Map the sg table so we have an accurate count of sg entries needed */
1469 	if (scsi_sg_count(cmd)) {
1470 		nseg = dma_map_sg(&ha->pdev->dev, scsi_sglist(cmd),
1471 		    scsi_sg_count(cmd), cmd->sc_data_direction);
1472 		if (unlikely(!nseg))
1473 			goto queuing_error;
1474 	} else
1475 		nseg = 0;
1476 
1477 	tot_dsds = nseg;
1478 	req_cnt = qla24xx_calc_iocbs(vha, tot_dsds);
1479 	if (req->cnt < (req_cnt + 2)) {
1480 		cnt = IS_SHADOW_REG_CAPABLE(ha) ? *req->out_ptr :
1481 		    RD_REG_DWORD_RELAXED(req->req_q_out);
1482 		if (req->ring_index < cnt)
1483 			req->cnt = cnt - req->ring_index;
1484 		else
1485 			req->cnt = req->length -
1486 				(req->ring_index - cnt);
1487 		if (req->cnt < (req_cnt + 2))
1488 			goto queuing_error;
1489 	}
1490 
1491 	/* Build command packet. */
1492 	req->current_outstanding_cmd = handle;
1493 	req->outstanding_cmds[handle] = sp;
1494 	sp->handle = handle;
1495 	cmd->host_scribble = (unsigned char *)(unsigned long)handle;
1496 	req->cnt -= req_cnt;
1497 
1498 	cmd_pkt = (struct cmd_type_7 *)req->ring_ptr;
1499 	cmd_pkt->handle = MAKE_HANDLE(req->id, handle);
1500 
1501 	/* Zero out remaining portion of packet. */
1502 	/*    tagged queuing modifier -- default is TSK_SIMPLE (0). */
1503 	clr_ptr = (uint32_t *)cmd_pkt + 2;
1504 	memset(clr_ptr, 0, REQUEST_ENTRY_SIZE - 8);
1505 	cmd_pkt->dseg_count = cpu_to_le16(tot_dsds);
1506 
1507 	/* Set NPORT-ID and LUN number*/
1508 	cmd_pkt->nport_handle = cpu_to_le16(sp->fcport->loop_id);
1509 	cmd_pkt->port_id[0] = sp->fcport->d_id.b.al_pa;
1510 	cmd_pkt->port_id[1] = sp->fcport->d_id.b.area;
1511 	cmd_pkt->port_id[2] = sp->fcport->d_id.b.domain;
1512 	cmd_pkt->vp_index = sp->fcport->vha->vp_idx;
1513 
1514 	int_to_scsilun(cmd->device->lun, &cmd_pkt->lun);
1515 	host_to_fcp_swap((uint8_t *)&cmd_pkt->lun, sizeof(cmd_pkt->lun));
1516 
1517 	cmd_pkt->task = TSK_SIMPLE;
1518 
1519 	/* Load SCSI command packet. */
1520 	memcpy(cmd_pkt->fcp_cdb, cmd->cmnd, cmd->cmd_len);
1521 	host_to_fcp_swap(cmd_pkt->fcp_cdb, sizeof(cmd_pkt->fcp_cdb));
1522 
1523 	cmd_pkt->byte_count = cpu_to_le32((uint32_t)scsi_bufflen(cmd));
1524 
1525 	/* Build IOCB segments */
1526 	qla24xx_build_scsi_iocbs(sp, cmd_pkt, tot_dsds);
1527 
1528 	/* Set total data segment count. */
1529 	cmd_pkt->entry_count = (uint8_t)req_cnt;
1530 	/* Specify response queue number where completion should happen */
1531 	cmd_pkt->entry_status = (uint8_t) rsp->id;
1532 	wmb();
1533 	/* Adjust ring index. */
1534 	req->ring_index++;
1535 	if (req->ring_index == req->length) {
1536 		req->ring_index = 0;
1537 		req->ring_ptr = req->ring;
1538 	} else
1539 		req->ring_ptr++;
1540 
1541 	sp->flags |= SRB_DMA_VALID;
1542 
1543 	/* Set chip new ring index. */
1544 	WRT_REG_DWORD(req->req_q_in, req->ring_index);
1545 	RD_REG_DWORD_RELAXED(&ha->iobase->isp24.hccr);
1546 
1547 	/* Manage unprocessed RIO/ZIO commands in response queue. */
1548 	if (vha->flags.process_response_queue &&
1549 		rsp->ring_ptr->signature != RESPONSE_PROCESSED)
1550 		qla24xx_process_response_queue(vha, rsp);
1551 
1552 	spin_unlock_irqrestore(&ha->hardware_lock, flags);
1553 	return QLA_SUCCESS;
1554 
1555 queuing_error:
1556 	if (tot_dsds)
1557 		scsi_dma_unmap(cmd);
1558 
1559 	spin_unlock_irqrestore(&ha->hardware_lock, flags);
1560 
1561 	return QLA_FUNCTION_FAILED;
1562 }
1563 
1564 /**
1565  * qla24xx_dif_start_scsi() - Send a SCSI command to the ISP
1566  * @sp: command to send to the ISP
1567  *
1568  * Returns non-zero if a failure occurred, else zero.
1569  */
1570 int
1571 qla24xx_dif_start_scsi(srb_t *sp)
1572 {
1573 	int			nseg;
1574 	unsigned long		flags;
1575 	uint32_t		*clr_ptr;
1576 	uint32_t		index;
1577 	uint32_t		handle;
1578 	uint16_t		cnt;
1579 	uint16_t		req_cnt = 0;
1580 	uint16_t		tot_dsds;
1581 	uint16_t		tot_prot_dsds;
1582 	uint16_t		fw_prot_opts = 0;
1583 	struct req_que		*req = NULL;
1584 	struct rsp_que		*rsp = NULL;
1585 	struct scsi_cmnd	*cmd = GET_CMD_SP(sp);
1586 	struct scsi_qla_host	*vha = sp->fcport->vha;
1587 	struct qla_hw_data	*ha = vha->hw;
1588 	struct cmd_type_crc_2	*cmd_pkt;
1589 	uint32_t		status = 0;
1590 
1591 #define QDSS_GOT_Q_SPACE	BIT_0
1592 
1593 	/* Only process protection or >16 cdb in this routine */
1594 	if (scsi_get_prot_op(cmd) == SCSI_PROT_NORMAL) {
1595 		if (cmd->cmd_len <= 16)
1596 			return qla24xx_start_scsi(sp);
1597 	}
1598 
1599 	/* Setup device pointers. */
1600 
1601 	qla25xx_set_que(sp, &rsp);
1602 	req = vha->req;
1603 
1604 	/* So we know we haven't pci_map'ed anything yet */
1605 	tot_dsds = 0;
1606 
1607 	/* Send marker if required */
1608 	if (vha->marker_needed != 0) {
1609 		if (qla2x00_marker(vha, req, rsp, 0, 0, MK_SYNC_ALL) !=
1610 		    QLA_SUCCESS)
1611 			return QLA_FUNCTION_FAILED;
1612 		vha->marker_needed = 0;
1613 	}
1614 
1615 	/* Acquire ring specific lock */
1616 	spin_lock_irqsave(&ha->hardware_lock, flags);
1617 
1618 	/* Check for room in outstanding command list. */
1619 	handle = req->current_outstanding_cmd;
1620 	for (index = 1; index < req->num_outstanding_cmds; index++) {
1621 		handle++;
1622 		if (handle == req->num_outstanding_cmds)
1623 			handle = 1;
1624 		if (!req->outstanding_cmds[handle])
1625 			break;
1626 	}
1627 
1628 	if (index == req->num_outstanding_cmds)
1629 		goto queuing_error;
1630 
1631 	/* Compute number of required data segments */
1632 	/* Map the sg table so we have an accurate count of sg entries needed */
1633 	if (scsi_sg_count(cmd)) {
1634 		nseg = dma_map_sg(&ha->pdev->dev, scsi_sglist(cmd),
1635 		    scsi_sg_count(cmd), cmd->sc_data_direction);
1636 		if (unlikely(!nseg))
1637 			goto queuing_error;
1638 		else
1639 			sp->flags |= SRB_DMA_VALID;
1640 
1641 		if ((scsi_get_prot_op(cmd) == SCSI_PROT_READ_INSERT) ||
1642 		    (scsi_get_prot_op(cmd) == SCSI_PROT_WRITE_STRIP)) {
1643 			struct qla2_sgx sgx;
1644 			uint32_t	partial;
1645 
1646 			memset(&sgx, 0, sizeof(struct qla2_sgx));
1647 			sgx.tot_bytes = scsi_bufflen(cmd);
1648 			sgx.cur_sg = scsi_sglist(cmd);
1649 			sgx.sp = sp;
1650 
1651 			nseg = 0;
1652 			while (qla24xx_get_one_block_sg(
1653 			    cmd->device->sector_size, &sgx, &partial))
1654 				nseg++;
1655 		}
1656 	} else
1657 		nseg = 0;
1658 
1659 	/* number of required data segments */
1660 	tot_dsds = nseg;
1661 
1662 	/* Compute number of required protection segments */
1663 	if (qla24xx_configure_prot_mode(sp, &fw_prot_opts)) {
1664 		nseg = dma_map_sg(&ha->pdev->dev, scsi_prot_sglist(cmd),
1665 		    scsi_prot_sg_count(cmd), cmd->sc_data_direction);
1666 		if (unlikely(!nseg))
1667 			goto queuing_error;
1668 		else
1669 			sp->flags |= SRB_CRC_PROT_DMA_VALID;
1670 
1671 		if ((scsi_get_prot_op(cmd) == SCSI_PROT_READ_INSERT) ||
1672 		    (scsi_get_prot_op(cmd) == SCSI_PROT_WRITE_STRIP)) {
1673 			nseg = scsi_bufflen(cmd) / cmd->device->sector_size;
1674 		}
1675 	} else {
1676 		nseg = 0;
1677 	}
1678 
1679 	req_cnt = 1;
1680 	/* Total Data and protection sg segment(s) */
1681 	tot_prot_dsds = nseg;
1682 	tot_dsds += nseg;
1683 	if (req->cnt < (req_cnt + 2)) {
1684 		cnt = IS_SHADOW_REG_CAPABLE(ha) ? *req->out_ptr :
1685 		    RD_REG_DWORD_RELAXED(req->req_q_out);
1686 		if (req->ring_index < cnt)
1687 			req->cnt = cnt - req->ring_index;
1688 		else
1689 			req->cnt = req->length -
1690 				(req->ring_index - cnt);
1691 		if (req->cnt < (req_cnt + 2))
1692 			goto queuing_error;
1693 	}
1694 
1695 	status |= QDSS_GOT_Q_SPACE;
1696 
1697 	/* Build header part of command packet (excluding the OPCODE). */
1698 	req->current_outstanding_cmd = handle;
1699 	req->outstanding_cmds[handle] = sp;
1700 	sp->handle = handle;
1701 	cmd->host_scribble = (unsigned char *)(unsigned long)handle;
1702 	req->cnt -= req_cnt;
1703 
1704 	/* Fill-in common area */
1705 	cmd_pkt = (struct cmd_type_crc_2 *)req->ring_ptr;
1706 	cmd_pkt->handle = MAKE_HANDLE(req->id, handle);
1707 
1708 	clr_ptr = (uint32_t *)cmd_pkt + 2;
1709 	memset(clr_ptr, 0, REQUEST_ENTRY_SIZE - 8);
1710 
1711 	/* Set NPORT-ID and LUN number*/
1712 	cmd_pkt->nport_handle = cpu_to_le16(sp->fcport->loop_id);
1713 	cmd_pkt->port_id[0] = sp->fcport->d_id.b.al_pa;
1714 	cmd_pkt->port_id[1] = sp->fcport->d_id.b.area;
1715 	cmd_pkt->port_id[2] = sp->fcport->d_id.b.domain;
1716 
1717 	int_to_scsilun(cmd->device->lun, &cmd_pkt->lun);
1718 	host_to_fcp_swap((uint8_t *)&cmd_pkt->lun, sizeof(cmd_pkt->lun));
1719 
1720 	/* Total Data and protection segment(s) */
1721 	cmd_pkt->dseg_count = cpu_to_le16(tot_dsds);
1722 
1723 	/* Build IOCB segments and adjust for data protection segments */
1724 	if (qla24xx_build_scsi_crc_2_iocbs(sp, (struct cmd_type_crc_2 *)
1725 	    req->ring_ptr, tot_dsds, tot_prot_dsds, fw_prot_opts) !=
1726 		QLA_SUCCESS)
1727 		goto queuing_error;
1728 
1729 	cmd_pkt->entry_count = (uint8_t)req_cnt;
1730 	/* Specify response queue number where completion should happen */
1731 	cmd_pkt->entry_status = (uint8_t) rsp->id;
1732 	cmd_pkt->timeout = cpu_to_le16(0);
1733 	wmb();
1734 
1735 	/* Adjust ring index. */
1736 	req->ring_index++;
1737 	if (req->ring_index == req->length) {
1738 		req->ring_index = 0;
1739 		req->ring_ptr = req->ring;
1740 	} else
1741 		req->ring_ptr++;
1742 
1743 	/* Set chip new ring index. */
1744 	WRT_REG_DWORD(req->req_q_in, req->ring_index);
1745 	RD_REG_DWORD_RELAXED(&ha->iobase->isp24.hccr);
1746 
1747 	/* Manage unprocessed RIO/ZIO commands in response queue. */
1748 	if (vha->flags.process_response_queue &&
1749 	    rsp->ring_ptr->signature != RESPONSE_PROCESSED)
1750 		qla24xx_process_response_queue(vha, rsp);
1751 
1752 	spin_unlock_irqrestore(&ha->hardware_lock, flags);
1753 
1754 	return QLA_SUCCESS;
1755 
1756 queuing_error:
1757 	if (status & QDSS_GOT_Q_SPACE) {
1758 		req->outstanding_cmds[handle] = NULL;
1759 		req->cnt += req_cnt;
1760 	}
1761 	/* Cleanup will be performed by the caller (queuecommand) */
1762 
1763 	spin_unlock_irqrestore(&ha->hardware_lock, flags);
1764 	return QLA_FUNCTION_FAILED;
1765 }
1766 
1767 
1768 static void qla25xx_set_que(srb_t *sp, struct rsp_que **rsp)
1769 {
1770 	struct scsi_cmnd *cmd = GET_CMD_SP(sp);
1771 	struct qla_hw_data *ha = sp->fcport->vha->hw;
1772 	int affinity = cmd->request->cpu;
1773 
1774 	if (ha->flags.cpu_affinity_enabled && affinity >= 0 &&
1775 		affinity < ha->max_rsp_queues - 1)
1776 		*rsp = ha->rsp_q_map[affinity + 1];
1777 	 else
1778 		*rsp = ha->rsp_q_map[0];
1779 }
1780 
1781 /* Generic Control-SRB manipulation functions. */
1782 
1783 /* hardware_lock assumed to be held. */
1784 void *
1785 qla2x00_alloc_iocbs_ready(scsi_qla_host_t *vha, srb_t *sp)
1786 {
1787 	if (qla2x00_reset_active(vha))
1788 		return NULL;
1789 
1790 	return qla2x00_alloc_iocbs(vha, sp);
1791 }
1792 
1793 void *
1794 qla2x00_alloc_iocbs(scsi_qla_host_t *vha, srb_t *sp)
1795 {
1796 	struct qla_hw_data *ha = vha->hw;
1797 	struct req_que *req = ha->req_q_map[0];
1798 	device_reg_t *reg = ISP_QUE_REG(ha, req->id);
1799 	uint32_t index, handle;
1800 	request_t *pkt;
1801 	uint16_t cnt, req_cnt;
1802 
1803 	pkt = NULL;
1804 	req_cnt = 1;
1805 	handle = 0;
1806 
1807 	if (!sp)
1808 		goto skip_cmd_array;
1809 
1810 	/* Check for room in outstanding command list. */
1811 	handle = req->current_outstanding_cmd;
1812 	for (index = 1; index < req->num_outstanding_cmds; index++) {
1813 		handle++;
1814 		if (handle == req->num_outstanding_cmds)
1815 			handle = 1;
1816 		if (!req->outstanding_cmds[handle])
1817 			break;
1818 	}
1819 	if (index == req->num_outstanding_cmds) {
1820 		ql_log(ql_log_warn, vha, 0x700b,
1821 		    "No room on outstanding cmd array.\n");
1822 		goto queuing_error;
1823 	}
1824 
1825 	/* Prep command array. */
1826 	req->current_outstanding_cmd = handle;
1827 	req->outstanding_cmds[handle] = sp;
1828 	sp->handle = handle;
1829 
1830 	/* Adjust entry-counts as needed. */
1831 	if (sp->type != SRB_SCSI_CMD)
1832 		req_cnt = sp->iocbs;
1833 
1834 skip_cmd_array:
1835 	/* Check for room on request queue. */
1836 	if (req->cnt < req_cnt + 2) {
1837 		if (ha->mqenable || IS_QLA83XX(ha) || IS_QLA27XX(ha))
1838 			cnt = RD_REG_DWORD(&reg->isp25mq.req_q_out);
1839 		else if (IS_P3P_TYPE(ha))
1840 			cnt = RD_REG_DWORD(&reg->isp82.req_q_out);
1841 		else if (IS_FWI2_CAPABLE(ha))
1842 			cnt = RD_REG_DWORD(&reg->isp24.req_q_out);
1843 		else if (IS_QLAFX00(ha))
1844 			cnt = RD_REG_DWORD(&reg->ispfx00.req_q_out);
1845 		else
1846 			cnt = qla2x00_debounce_register(
1847 			    ISP_REQ_Q_OUT(ha, &reg->isp));
1848 
1849 		if  (req->ring_index < cnt)
1850 			req->cnt = cnt - req->ring_index;
1851 		else
1852 			req->cnt = req->length -
1853 			    (req->ring_index - cnt);
1854 	}
1855 	if (req->cnt < req_cnt + 2)
1856 		goto queuing_error;
1857 
1858 	/* Prep packet */
1859 	req->cnt -= req_cnt;
1860 	pkt = req->ring_ptr;
1861 	memset(pkt, 0, REQUEST_ENTRY_SIZE);
1862 	if (IS_QLAFX00(ha)) {
1863 		WRT_REG_BYTE((void __iomem *)&pkt->entry_count, req_cnt);
1864 		WRT_REG_WORD((void __iomem *)&pkt->handle, handle);
1865 	} else {
1866 		pkt->entry_count = req_cnt;
1867 		pkt->handle = handle;
1868 	}
1869 
1870 queuing_error:
1871 	return pkt;
1872 }
1873 
1874 static void
1875 qla24xx_login_iocb(srb_t *sp, struct logio_entry_24xx *logio)
1876 {
1877 	struct srb_iocb *lio = &sp->u.iocb_cmd;
1878 
1879 	logio->entry_type = LOGINOUT_PORT_IOCB_TYPE;
1880 	logio->control_flags = cpu_to_le16(LCF_COMMAND_PLOGI);
1881 	if (lio->u.logio.flags & SRB_LOGIN_COND_PLOGI)
1882 		logio->control_flags |= cpu_to_le16(LCF_COND_PLOGI);
1883 	if (lio->u.logio.flags & SRB_LOGIN_SKIP_PRLI)
1884 		logio->control_flags |= cpu_to_le16(LCF_SKIP_PRLI);
1885 	logio->nport_handle = cpu_to_le16(sp->fcport->loop_id);
1886 	logio->port_id[0] = sp->fcport->d_id.b.al_pa;
1887 	logio->port_id[1] = sp->fcport->d_id.b.area;
1888 	logio->port_id[2] = sp->fcport->d_id.b.domain;
1889 	logio->vp_index = sp->fcport->vha->vp_idx;
1890 }
1891 
1892 static void
1893 qla2x00_login_iocb(srb_t *sp, struct mbx_entry *mbx)
1894 {
1895 	struct qla_hw_data *ha = sp->fcport->vha->hw;
1896 	struct srb_iocb *lio = &sp->u.iocb_cmd;
1897 	uint16_t opts;
1898 
1899 	mbx->entry_type = MBX_IOCB_TYPE;
1900 	SET_TARGET_ID(ha, mbx->loop_id, sp->fcport->loop_id);
1901 	mbx->mb0 = cpu_to_le16(MBC_LOGIN_FABRIC_PORT);
1902 	opts = lio->u.logio.flags & SRB_LOGIN_COND_PLOGI ? BIT_0 : 0;
1903 	opts |= lio->u.logio.flags & SRB_LOGIN_SKIP_PRLI ? BIT_1 : 0;
1904 	if (HAS_EXTENDED_IDS(ha)) {
1905 		mbx->mb1 = cpu_to_le16(sp->fcport->loop_id);
1906 		mbx->mb10 = cpu_to_le16(opts);
1907 	} else {
1908 		mbx->mb1 = cpu_to_le16((sp->fcport->loop_id << 8) | opts);
1909 	}
1910 	mbx->mb2 = cpu_to_le16(sp->fcport->d_id.b.domain);
1911 	mbx->mb3 = cpu_to_le16(sp->fcport->d_id.b.area << 8 |
1912 	    sp->fcport->d_id.b.al_pa);
1913 	mbx->mb9 = cpu_to_le16(sp->fcport->vha->vp_idx);
1914 }
1915 
1916 static void
1917 qla24xx_logout_iocb(srb_t *sp, struct logio_entry_24xx *logio)
1918 {
1919 	logio->entry_type = LOGINOUT_PORT_IOCB_TYPE;
1920 	logio->control_flags =
1921 	    cpu_to_le16(LCF_COMMAND_LOGO|LCF_IMPL_LOGO);
1922 	if (!sp->fcport->tgt_session ||
1923 	    !sp->fcport->tgt_session->keep_nport_handle)
1924 		logio->control_flags |= cpu_to_le16(LCF_FREE_NPORT);
1925 	logio->nport_handle = cpu_to_le16(sp->fcport->loop_id);
1926 	logio->port_id[0] = sp->fcport->d_id.b.al_pa;
1927 	logio->port_id[1] = sp->fcport->d_id.b.area;
1928 	logio->port_id[2] = sp->fcport->d_id.b.domain;
1929 	logio->vp_index = sp->fcport->vha->vp_idx;
1930 }
1931 
1932 static void
1933 qla2x00_logout_iocb(srb_t *sp, struct mbx_entry *mbx)
1934 {
1935 	struct qla_hw_data *ha = sp->fcport->vha->hw;
1936 
1937 	mbx->entry_type = MBX_IOCB_TYPE;
1938 	SET_TARGET_ID(ha, mbx->loop_id, sp->fcport->loop_id);
1939 	mbx->mb0 = cpu_to_le16(MBC_LOGOUT_FABRIC_PORT);
1940 	mbx->mb1 = HAS_EXTENDED_IDS(ha) ?
1941 	    cpu_to_le16(sp->fcport->loop_id):
1942 	    cpu_to_le16(sp->fcport->loop_id << 8);
1943 	mbx->mb2 = cpu_to_le16(sp->fcport->d_id.b.domain);
1944 	mbx->mb3 = cpu_to_le16(sp->fcport->d_id.b.area << 8 |
1945 	    sp->fcport->d_id.b.al_pa);
1946 	mbx->mb9 = cpu_to_le16(sp->fcport->vha->vp_idx);
1947 	/* Implicit: mbx->mbx10 = 0. */
1948 }
1949 
1950 static void
1951 qla24xx_adisc_iocb(srb_t *sp, struct logio_entry_24xx *logio)
1952 {
1953 	logio->entry_type = LOGINOUT_PORT_IOCB_TYPE;
1954 	logio->control_flags = cpu_to_le16(LCF_COMMAND_ADISC);
1955 	logio->nport_handle = cpu_to_le16(sp->fcport->loop_id);
1956 	logio->vp_index = sp->fcport->vha->vp_idx;
1957 }
1958 
1959 static void
1960 qla2x00_adisc_iocb(srb_t *sp, struct mbx_entry *mbx)
1961 {
1962 	struct qla_hw_data *ha = sp->fcport->vha->hw;
1963 
1964 	mbx->entry_type = MBX_IOCB_TYPE;
1965 	SET_TARGET_ID(ha, mbx->loop_id, sp->fcport->loop_id);
1966 	mbx->mb0 = cpu_to_le16(MBC_GET_PORT_DATABASE);
1967 	if (HAS_EXTENDED_IDS(ha)) {
1968 		mbx->mb1 = cpu_to_le16(sp->fcport->loop_id);
1969 		mbx->mb10 = cpu_to_le16(BIT_0);
1970 	} else {
1971 		mbx->mb1 = cpu_to_le16((sp->fcport->loop_id << 8) | BIT_0);
1972 	}
1973 	mbx->mb2 = cpu_to_le16(MSW(ha->async_pd_dma));
1974 	mbx->mb3 = cpu_to_le16(LSW(ha->async_pd_dma));
1975 	mbx->mb6 = cpu_to_le16(MSW(MSD(ha->async_pd_dma)));
1976 	mbx->mb7 = cpu_to_le16(LSW(MSD(ha->async_pd_dma)));
1977 	mbx->mb9 = cpu_to_le16(sp->fcport->vha->vp_idx);
1978 }
1979 
1980 static void
1981 qla24xx_tm_iocb(srb_t *sp, struct tsk_mgmt_entry *tsk)
1982 {
1983 	uint32_t flags;
1984 	uint64_t lun;
1985 	struct fc_port *fcport = sp->fcport;
1986 	scsi_qla_host_t *vha = fcport->vha;
1987 	struct qla_hw_data *ha = vha->hw;
1988 	struct srb_iocb *iocb = &sp->u.iocb_cmd;
1989 	struct req_que *req = vha->req;
1990 
1991 	flags = iocb->u.tmf.flags;
1992 	lun = iocb->u.tmf.lun;
1993 
1994 	tsk->entry_type = TSK_MGMT_IOCB_TYPE;
1995 	tsk->entry_count = 1;
1996 	tsk->handle = MAKE_HANDLE(req->id, tsk->handle);
1997 	tsk->nport_handle = cpu_to_le16(fcport->loop_id);
1998 	tsk->timeout = cpu_to_le16(ha->r_a_tov / 10 * 2);
1999 	tsk->control_flags = cpu_to_le32(flags);
2000 	tsk->port_id[0] = fcport->d_id.b.al_pa;
2001 	tsk->port_id[1] = fcport->d_id.b.area;
2002 	tsk->port_id[2] = fcport->d_id.b.domain;
2003 	tsk->vp_index = fcport->vha->vp_idx;
2004 
2005 	if (flags == TCF_LUN_RESET) {
2006 		int_to_scsilun(lun, &tsk->lun);
2007 		host_to_fcp_swap((uint8_t *)&tsk->lun,
2008 			sizeof(tsk->lun));
2009 	}
2010 }
2011 
2012 static void
2013 qla24xx_els_iocb(srb_t *sp, struct els_entry_24xx *els_iocb)
2014 {
2015 	struct fc_bsg_job *bsg_job = sp->u.bsg_job;
2016 
2017         els_iocb->entry_type = ELS_IOCB_TYPE;
2018         els_iocb->entry_count = 1;
2019         els_iocb->sys_define = 0;
2020         els_iocb->entry_status = 0;
2021         els_iocb->handle = sp->handle;
2022         els_iocb->nport_handle = cpu_to_le16(sp->fcport->loop_id);
2023 	els_iocb->tx_dsd_count = cpu_to_le16(bsg_job->request_payload.sg_cnt);
2024 	els_iocb->vp_index = sp->fcport->vha->vp_idx;
2025         els_iocb->sof_type = EST_SOFI3;
2026 	els_iocb->rx_dsd_count = cpu_to_le16(bsg_job->reply_payload.sg_cnt);
2027 
2028 	els_iocb->opcode =
2029 	    sp->type == SRB_ELS_CMD_RPT ?
2030 	    bsg_job->request->rqst_data.r_els.els_code :
2031 	    bsg_job->request->rqst_data.h_els.command_code;
2032         els_iocb->port_id[0] = sp->fcport->d_id.b.al_pa;
2033         els_iocb->port_id[1] = sp->fcport->d_id.b.area;
2034         els_iocb->port_id[2] = sp->fcport->d_id.b.domain;
2035         els_iocb->control_flags = 0;
2036         els_iocb->rx_byte_count =
2037             cpu_to_le32(bsg_job->reply_payload.payload_len);
2038         els_iocb->tx_byte_count =
2039             cpu_to_le32(bsg_job->request_payload.payload_len);
2040 
2041         els_iocb->tx_address[0] = cpu_to_le32(LSD(sg_dma_address
2042             (bsg_job->request_payload.sg_list)));
2043         els_iocb->tx_address[1] = cpu_to_le32(MSD(sg_dma_address
2044             (bsg_job->request_payload.sg_list)));
2045         els_iocb->tx_len = cpu_to_le32(sg_dma_len
2046             (bsg_job->request_payload.sg_list));
2047 
2048         els_iocb->rx_address[0] = cpu_to_le32(LSD(sg_dma_address
2049             (bsg_job->reply_payload.sg_list)));
2050         els_iocb->rx_address[1] = cpu_to_le32(MSD(sg_dma_address
2051             (bsg_job->reply_payload.sg_list)));
2052         els_iocb->rx_len = cpu_to_le32(sg_dma_len
2053             (bsg_job->reply_payload.sg_list));
2054 
2055 	sp->fcport->vha->qla_stats.control_requests++;
2056 }
2057 
2058 static void
2059 qla2x00_ct_iocb(srb_t *sp, ms_iocb_entry_t *ct_iocb)
2060 {
2061 	uint16_t        avail_dsds;
2062 	uint32_t        *cur_dsd;
2063 	struct scatterlist *sg;
2064 	int index;
2065 	uint16_t tot_dsds;
2066 	scsi_qla_host_t *vha = sp->fcport->vha;
2067 	struct qla_hw_data *ha = vha->hw;
2068 	struct fc_bsg_job *bsg_job = sp->u.bsg_job;
2069 	int loop_iterartion = 0;
2070 	int entry_count = 1;
2071 
2072 	memset(ct_iocb, 0, sizeof(ms_iocb_entry_t));
2073 	ct_iocb->entry_type = CT_IOCB_TYPE;
2074 	ct_iocb->entry_status = 0;
2075 	ct_iocb->handle1 = sp->handle;
2076 	SET_TARGET_ID(ha, ct_iocb->loop_id, sp->fcport->loop_id);
2077 	ct_iocb->status = cpu_to_le16(0);
2078 	ct_iocb->control_flags = cpu_to_le16(0);
2079 	ct_iocb->timeout = 0;
2080 	ct_iocb->cmd_dsd_count =
2081 	    cpu_to_le16(bsg_job->request_payload.sg_cnt);
2082 	ct_iocb->total_dsd_count =
2083 	    cpu_to_le16(bsg_job->request_payload.sg_cnt + 1);
2084 	ct_iocb->req_bytecount =
2085 	    cpu_to_le32(bsg_job->request_payload.payload_len);
2086 	ct_iocb->rsp_bytecount =
2087 	    cpu_to_le32(bsg_job->reply_payload.payload_len);
2088 
2089 	ct_iocb->dseg_req_address[0] = cpu_to_le32(LSD(sg_dma_address
2090 	    (bsg_job->request_payload.sg_list)));
2091 	ct_iocb->dseg_req_address[1] = cpu_to_le32(MSD(sg_dma_address
2092 	    (bsg_job->request_payload.sg_list)));
2093 	ct_iocb->dseg_req_length = ct_iocb->req_bytecount;
2094 
2095 	ct_iocb->dseg_rsp_address[0] = cpu_to_le32(LSD(sg_dma_address
2096 	    (bsg_job->reply_payload.sg_list)));
2097 	ct_iocb->dseg_rsp_address[1] = cpu_to_le32(MSD(sg_dma_address
2098 	    (bsg_job->reply_payload.sg_list)));
2099 	ct_iocb->dseg_rsp_length = ct_iocb->rsp_bytecount;
2100 
2101 	avail_dsds = 1;
2102 	cur_dsd = (uint32_t *)ct_iocb->dseg_rsp_address;
2103 	index = 0;
2104 	tot_dsds = bsg_job->reply_payload.sg_cnt;
2105 
2106 	for_each_sg(bsg_job->reply_payload.sg_list, sg, tot_dsds, index) {
2107 		dma_addr_t       sle_dma;
2108 		cont_a64_entry_t *cont_pkt;
2109 
2110 		/* Allocate additional continuation packets? */
2111 		if (avail_dsds == 0) {
2112 			/*
2113 			* Five DSDs are available in the Cont.
2114 			* Type 1 IOCB.
2115 			       */
2116 			cont_pkt = qla2x00_prep_cont_type1_iocb(vha,
2117 			    vha->hw->req_q_map[0]);
2118 			cur_dsd = (uint32_t *) cont_pkt->dseg_0_address;
2119 			avail_dsds = 5;
2120 			entry_count++;
2121 		}
2122 
2123 		sle_dma = sg_dma_address(sg);
2124 		*cur_dsd++   = cpu_to_le32(LSD(sle_dma));
2125 		*cur_dsd++   = cpu_to_le32(MSD(sle_dma));
2126 		*cur_dsd++   = cpu_to_le32(sg_dma_len(sg));
2127 		loop_iterartion++;
2128 		avail_dsds--;
2129 	}
2130 	ct_iocb->entry_count = entry_count;
2131 
2132 	sp->fcport->vha->qla_stats.control_requests++;
2133 }
2134 
2135 static void
2136 qla24xx_ct_iocb(srb_t *sp, struct ct_entry_24xx *ct_iocb)
2137 {
2138 	uint16_t        avail_dsds;
2139 	uint32_t        *cur_dsd;
2140 	struct scatterlist *sg;
2141 	int index;
2142 	uint16_t tot_dsds;
2143         scsi_qla_host_t *vha = sp->fcport->vha;
2144 	struct qla_hw_data *ha = vha->hw;
2145 	struct fc_bsg_job *bsg_job = sp->u.bsg_job;
2146 	int loop_iterartion = 0;
2147 	int entry_count = 1;
2148 
2149 	ct_iocb->entry_type = CT_IOCB_TYPE;
2150         ct_iocb->entry_status = 0;
2151         ct_iocb->sys_define = 0;
2152         ct_iocb->handle = sp->handle;
2153 
2154 	ct_iocb->nport_handle = cpu_to_le16(sp->fcport->loop_id);
2155 	ct_iocb->vp_index = sp->fcport->vha->vp_idx;
2156 	ct_iocb->comp_status = cpu_to_le16(0);
2157 
2158 	ct_iocb->cmd_dsd_count =
2159 		cpu_to_le16(bsg_job->request_payload.sg_cnt);
2160         ct_iocb->timeout = 0;
2161         ct_iocb->rsp_dsd_count =
2162 		cpu_to_le16(bsg_job->reply_payload.sg_cnt);
2163         ct_iocb->rsp_byte_count =
2164             cpu_to_le32(bsg_job->reply_payload.payload_len);
2165         ct_iocb->cmd_byte_count =
2166             cpu_to_le32(bsg_job->request_payload.payload_len);
2167         ct_iocb->dseg_0_address[0] = cpu_to_le32(LSD(sg_dma_address
2168             (bsg_job->request_payload.sg_list)));
2169         ct_iocb->dseg_0_address[1] = cpu_to_le32(MSD(sg_dma_address
2170            (bsg_job->request_payload.sg_list)));
2171         ct_iocb->dseg_0_len = cpu_to_le32(sg_dma_len
2172             (bsg_job->request_payload.sg_list));
2173 
2174 	avail_dsds = 1;
2175 	cur_dsd = (uint32_t *)ct_iocb->dseg_1_address;
2176 	index = 0;
2177 	tot_dsds = bsg_job->reply_payload.sg_cnt;
2178 
2179 	for_each_sg(bsg_job->reply_payload.sg_list, sg, tot_dsds, index) {
2180 		dma_addr_t       sle_dma;
2181 		cont_a64_entry_t *cont_pkt;
2182 
2183 		/* Allocate additional continuation packets? */
2184 		if (avail_dsds == 0) {
2185 			/*
2186 			* Five DSDs are available in the Cont.
2187 			* Type 1 IOCB.
2188 			       */
2189 			cont_pkt = qla2x00_prep_cont_type1_iocb(vha,
2190 			    ha->req_q_map[0]);
2191 			cur_dsd = (uint32_t *) cont_pkt->dseg_0_address;
2192 			avail_dsds = 5;
2193 			entry_count++;
2194 		}
2195 
2196 		sle_dma = sg_dma_address(sg);
2197 		*cur_dsd++   = cpu_to_le32(LSD(sle_dma));
2198 		*cur_dsd++   = cpu_to_le32(MSD(sle_dma));
2199 		*cur_dsd++   = cpu_to_le32(sg_dma_len(sg));
2200 		loop_iterartion++;
2201 		avail_dsds--;
2202 	}
2203         ct_iocb->entry_count = entry_count;
2204 }
2205 
2206 /*
2207  * qla82xx_start_scsi() - Send a SCSI command to the ISP
2208  * @sp: command to send to the ISP
2209  *
2210  * Returns non-zero if a failure occurred, else zero.
2211  */
2212 int
2213 qla82xx_start_scsi(srb_t *sp)
2214 {
2215 	int		nseg;
2216 	unsigned long   flags;
2217 	struct scsi_cmnd *cmd;
2218 	uint32_t	*clr_ptr;
2219 	uint32_t        index;
2220 	uint32_t	handle;
2221 	uint16_t	cnt;
2222 	uint16_t	req_cnt;
2223 	uint16_t	tot_dsds;
2224 	struct device_reg_82xx __iomem *reg;
2225 	uint32_t dbval;
2226 	uint32_t *fcp_dl;
2227 	uint8_t additional_cdb_len;
2228 	struct ct6_dsd *ctx;
2229 	struct scsi_qla_host *vha = sp->fcport->vha;
2230 	struct qla_hw_data *ha = vha->hw;
2231 	struct req_que *req = NULL;
2232 	struct rsp_que *rsp = NULL;
2233 
2234 	/* Setup device pointers. */
2235 	reg = &ha->iobase->isp82;
2236 	cmd = GET_CMD_SP(sp);
2237 	req = vha->req;
2238 	rsp = ha->rsp_q_map[0];
2239 
2240 	/* So we know we haven't pci_map'ed anything yet */
2241 	tot_dsds = 0;
2242 
2243 	dbval = 0x04 | (ha->portnum << 5);
2244 
2245 	/* Send marker if required */
2246 	if (vha->marker_needed != 0) {
2247 		if (qla2x00_marker(vha, req,
2248 			rsp, 0, 0, MK_SYNC_ALL) != QLA_SUCCESS) {
2249 			ql_log(ql_log_warn, vha, 0x300c,
2250 			    "qla2x00_marker failed for cmd=%p.\n", cmd);
2251 			return QLA_FUNCTION_FAILED;
2252 		}
2253 		vha->marker_needed = 0;
2254 	}
2255 
2256 	/* Acquire ring specific lock */
2257 	spin_lock_irqsave(&ha->hardware_lock, flags);
2258 
2259 	/* Check for room in outstanding command list. */
2260 	handle = req->current_outstanding_cmd;
2261 	for (index = 1; index < req->num_outstanding_cmds; index++) {
2262 		handle++;
2263 		if (handle == req->num_outstanding_cmds)
2264 			handle = 1;
2265 		if (!req->outstanding_cmds[handle])
2266 			break;
2267 	}
2268 	if (index == req->num_outstanding_cmds)
2269 		goto queuing_error;
2270 
2271 	/* Map the sg table so we have an accurate count of sg entries needed */
2272 	if (scsi_sg_count(cmd)) {
2273 		nseg = dma_map_sg(&ha->pdev->dev, scsi_sglist(cmd),
2274 		    scsi_sg_count(cmd), cmd->sc_data_direction);
2275 		if (unlikely(!nseg))
2276 			goto queuing_error;
2277 	} else
2278 		nseg = 0;
2279 
2280 	tot_dsds = nseg;
2281 
2282 	if (tot_dsds > ql2xshiftctondsd) {
2283 		struct cmd_type_6 *cmd_pkt;
2284 		uint16_t more_dsd_lists = 0;
2285 		struct dsd_dma *dsd_ptr;
2286 		uint16_t i;
2287 
2288 		more_dsd_lists = qla24xx_calc_dsd_lists(tot_dsds);
2289 		if ((more_dsd_lists + ha->gbl_dsd_inuse) >= NUM_DSD_CHAIN) {
2290 			ql_dbg(ql_dbg_io, vha, 0x300d,
2291 			    "Num of DSD list %d is than %d for cmd=%p.\n",
2292 			    more_dsd_lists + ha->gbl_dsd_inuse, NUM_DSD_CHAIN,
2293 			    cmd);
2294 			goto queuing_error;
2295 		}
2296 
2297 		if (more_dsd_lists <= ha->gbl_dsd_avail)
2298 			goto sufficient_dsds;
2299 		else
2300 			more_dsd_lists -= ha->gbl_dsd_avail;
2301 
2302 		for (i = 0; i < more_dsd_lists; i++) {
2303 			dsd_ptr = kzalloc(sizeof(struct dsd_dma), GFP_ATOMIC);
2304 			if (!dsd_ptr) {
2305 				ql_log(ql_log_fatal, vha, 0x300e,
2306 				    "Failed to allocate memory for dsd_dma "
2307 				    "for cmd=%p.\n", cmd);
2308 				goto queuing_error;
2309 			}
2310 
2311 			dsd_ptr->dsd_addr = dma_pool_alloc(ha->dl_dma_pool,
2312 				GFP_ATOMIC, &dsd_ptr->dsd_list_dma);
2313 			if (!dsd_ptr->dsd_addr) {
2314 				kfree(dsd_ptr);
2315 				ql_log(ql_log_fatal, vha, 0x300f,
2316 				    "Failed to allocate memory for dsd_addr "
2317 				    "for cmd=%p.\n", cmd);
2318 				goto queuing_error;
2319 			}
2320 			list_add_tail(&dsd_ptr->list, &ha->gbl_dsd_list);
2321 			ha->gbl_dsd_avail++;
2322 		}
2323 
2324 sufficient_dsds:
2325 		req_cnt = 1;
2326 
2327 		if (req->cnt < (req_cnt + 2)) {
2328 			cnt = (uint16_t)RD_REG_DWORD_RELAXED(
2329 				&reg->req_q_out[0]);
2330 			if (req->ring_index < cnt)
2331 				req->cnt = cnt - req->ring_index;
2332 			else
2333 				req->cnt = req->length -
2334 					(req->ring_index - cnt);
2335 			if (req->cnt < (req_cnt + 2))
2336 				goto queuing_error;
2337 		}
2338 
2339 		ctx = sp->u.scmd.ctx =
2340 		    mempool_alloc(ha->ctx_mempool, GFP_ATOMIC);
2341 		if (!ctx) {
2342 			ql_log(ql_log_fatal, vha, 0x3010,
2343 			    "Failed to allocate ctx for cmd=%p.\n", cmd);
2344 			goto queuing_error;
2345 		}
2346 
2347 		memset(ctx, 0, sizeof(struct ct6_dsd));
2348 		ctx->fcp_cmnd = dma_pool_alloc(ha->fcp_cmnd_dma_pool,
2349 			GFP_ATOMIC, &ctx->fcp_cmnd_dma);
2350 		if (!ctx->fcp_cmnd) {
2351 			ql_log(ql_log_fatal, vha, 0x3011,
2352 			    "Failed to allocate fcp_cmnd for cmd=%p.\n", cmd);
2353 			goto queuing_error;
2354 		}
2355 
2356 		/* Initialize the DSD list and dma handle */
2357 		INIT_LIST_HEAD(&ctx->dsd_list);
2358 		ctx->dsd_use_cnt = 0;
2359 
2360 		if (cmd->cmd_len > 16) {
2361 			additional_cdb_len = cmd->cmd_len - 16;
2362 			if ((cmd->cmd_len % 4) != 0) {
2363 				/* SCSI command bigger than 16 bytes must be
2364 				 * multiple of 4
2365 				 */
2366 				ql_log(ql_log_warn, vha, 0x3012,
2367 				    "scsi cmd len %d not multiple of 4 "
2368 				    "for cmd=%p.\n", cmd->cmd_len, cmd);
2369 				goto queuing_error_fcp_cmnd;
2370 			}
2371 			ctx->fcp_cmnd_len = 12 + cmd->cmd_len + 4;
2372 		} else {
2373 			additional_cdb_len = 0;
2374 			ctx->fcp_cmnd_len = 12 + 16 + 4;
2375 		}
2376 
2377 		cmd_pkt = (struct cmd_type_6 *)req->ring_ptr;
2378 		cmd_pkt->handle = MAKE_HANDLE(req->id, handle);
2379 
2380 		/* Zero out remaining portion of packet. */
2381 		/*    tagged queuing modifier -- default is TSK_SIMPLE (0). */
2382 		clr_ptr = (uint32_t *)cmd_pkt + 2;
2383 		memset(clr_ptr, 0, REQUEST_ENTRY_SIZE - 8);
2384 		cmd_pkt->dseg_count = cpu_to_le16(tot_dsds);
2385 
2386 		/* Set NPORT-ID and LUN number*/
2387 		cmd_pkt->nport_handle = cpu_to_le16(sp->fcport->loop_id);
2388 		cmd_pkt->port_id[0] = sp->fcport->d_id.b.al_pa;
2389 		cmd_pkt->port_id[1] = sp->fcport->d_id.b.area;
2390 		cmd_pkt->port_id[2] = sp->fcport->d_id.b.domain;
2391 		cmd_pkt->vp_index = sp->fcport->vha->vp_idx;
2392 
2393 		/* Build IOCB segments */
2394 		if (qla24xx_build_scsi_type_6_iocbs(sp, cmd_pkt, tot_dsds))
2395 			goto queuing_error_fcp_cmnd;
2396 
2397 		int_to_scsilun(cmd->device->lun, &cmd_pkt->lun);
2398 		host_to_fcp_swap((uint8_t *)&cmd_pkt->lun, sizeof(cmd_pkt->lun));
2399 
2400 		/* build FCP_CMND IU */
2401 		memset(ctx->fcp_cmnd, 0, sizeof(struct fcp_cmnd));
2402 		int_to_scsilun(cmd->device->lun, &ctx->fcp_cmnd->lun);
2403 		ctx->fcp_cmnd->additional_cdb_len = additional_cdb_len;
2404 
2405 		if (cmd->sc_data_direction == DMA_TO_DEVICE)
2406 			ctx->fcp_cmnd->additional_cdb_len |= 1;
2407 		else if (cmd->sc_data_direction == DMA_FROM_DEVICE)
2408 			ctx->fcp_cmnd->additional_cdb_len |= 2;
2409 
2410 		/* Populate the FCP_PRIO. */
2411 		if (ha->flags.fcp_prio_enabled)
2412 			ctx->fcp_cmnd->task_attribute |=
2413 			    sp->fcport->fcp_prio << 3;
2414 
2415 		memcpy(ctx->fcp_cmnd->cdb, cmd->cmnd, cmd->cmd_len);
2416 
2417 		fcp_dl = (uint32_t *)(ctx->fcp_cmnd->cdb + 16 +
2418 		    additional_cdb_len);
2419 		*fcp_dl = htonl((uint32_t)scsi_bufflen(cmd));
2420 
2421 		cmd_pkt->fcp_cmnd_dseg_len = cpu_to_le16(ctx->fcp_cmnd_len);
2422 		cmd_pkt->fcp_cmnd_dseg_address[0] =
2423 		    cpu_to_le32(LSD(ctx->fcp_cmnd_dma));
2424 		cmd_pkt->fcp_cmnd_dseg_address[1] =
2425 		    cpu_to_le32(MSD(ctx->fcp_cmnd_dma));
2426 
2427 		sp->flags |= SRB_FCP_CMND_DMA_VALID;
2428 		cmd_pkt->byte_count = cpu_to_le32((uint32_t)scsi_bufflen(cmd));
2429 		/* Set total data segment count. */
2430 		cmd_pkt->entry_count = (uint8_t)req_cnt;
2431 		/* Specify response queue number where
2432 		 * completion should happen
2433 		 */
2434 		cmd_pkt->entry_status = (uint8_t) rsp->id;
2435 	} else {
2436 		struct cmd_type_7 *cmd_pkt;
2437 		req_cnt = qla24xx_calc_iocbs(vha, tot_dsds);
2438 		if (req->cnt < (req_cnt + 2)) {
2439 			cnt = (uint16_t)RD_REG_DWORD_RELAXED(
2440 			    &reg->req_q_out[0]);
2441 			if (req->ring_index < cnt)
2442 				req->cnt = cnt - req->ring_index;
2443 			else
2444 				req->cnt = req->length -
2445 					(req->ring_index - cnt);
2446 		}
2447 		if (req->cnt < (req_cnt + 2))
2448 			goto queuing_error;
2449 
2450 		cmd_pkt = (struct cmd_type_7 *)req->ring_ptr;
2451 		cmd_pkt->handle = MAKE_HANDLE(req->id, handle);
2452 
2453 		/* Zero out remaining portion of packet. */
2454 		/* tagged queuing modifier -- default is TSK_SIMPLE (0).*/
2455 		clr_ptr = (uint32_t *)cmd_pkt + 2;
2456 		memset(clr_ptr, 0, REQUEST_ENTRY_SIZE - 8);
2457 		cmd_pkt->dseg_count = cpu_to_le16(tot_dsds);
2458 
2459 		/* Set NPORT-ID and LUN number*/
2460 		cmd_pkt->nport_handle = cpu_to_le16(sp->fcport->loop_id);
2461 		cmd_pkt->port_id[0] = sp->fcport->d_id.b.al_pa;
2462 		cmd_pkt->port_id[1] = sp->fcport->d_id.b.area;
2463 		cmd_pkt->port_id[2] = sp->fcport->d_id.b.domain;
2464 		cmd_pkt->vp_index = sp->fcport->vha->vp_idx;
2465 
2466 		int_to_scsilun(cmd->device->lun, &cmd_pkt->lun);
2467 		host_to_fcp_swap((uint8_t *)&cmd_pkt->lun,
2468 		    sizeof(cmd_pkt->lun));
2469 
2470 		/* Populate the FCP_PRIO. */
2471 		if (ha->flags.fcp_prio_enabled)
2472 			cmd_pkt->task |= sp->fcport->fcp_prio << 3;
2473 
2474 		/* Load SCSI command packet. */
2475 		memcpy(cmd_pkt->fcp_cdb, cmd->cmnd, cmd->cmd_len);
2476 		host_to_fcp_swap(cmd_pkt->fcp_cdb, sizeof(cmd_pkt->fcp_cdb));
2477 
2478 		cmd_pkt->byte_count = cpu_to_le32((uint32_t)scsi_bufflen(cmd));
2479 
2480 		/* Build IOCB segments */
2481 		qla24xx_build_scsi_iocbs(sp, cmd_pkt, tot_dsds);
2482 
2483 		/* Set total data segment count. */
2484 		cmd_pkt->entry_count = (uint8_t)req_cnt;
2485 		/* Specify response queue number where
2486 		 * completion should happen.
2487 		 */
2488 		cmd_pkt->entry_status = (uint8_t) rsp->id;
2489 
2490 	}
2491 	/* Build command packet. */
2492 	req->current_outstanding_cmd = handle;
2493 	req->outstanding_cmds[handle] = sp;
2494 	sp->handle = handle;
2495 	cmd->host_scribble = (unsigned char *)(unsigned long)handle;
2496 	req->cnt -= req_cnt;
2497 	wmb();
2498 
2499 	/* Adjust ring index. */
2500 	req->ring_index++;
2501 	if (req->ring_index == req->length) {
2502 		req->ring_index = 0;
2503 		req->ring_ptr = req->ring;
2504 	} else
2505 		req->ring_ptr++;
2506 
2507 	sp->flags |= SRB_DMA_VALID;
2508 
2509 	/* Set chip new ring index. */
2510 	/* write, read and verify logic */
2511 	dbval = dbval | (req->id << 8) | (req->ring_index << 16);
2512 	if (ql2xdbwr)
2513 		qla82xx_wr_32(ha, (uintptr_t __force)ha->nxdb_wr_ptr, dbval);
2514 	else {
2515 		WRT_REG_DWORD(ha->nxdb_wr_ptr, dbval);
2516 		wmb();
2517 		while (RD_REG_DWORD(ha->nxdb_rd_ptr) != dbval) {
2518 			WRT_REG_DWORD(ha->nxdb_wr_ptr, dbval);
2519 			wmb();
2520 		}
2521 	}
2522 
2523 	/* Manage unprocessed RIO/ZIO commands in response queue. */
2524 	if (vha->flags.process_response_queue &&
2525 	    rsp->ring_ptr->signature != RESPONSE_PROCESSED)
2526 		qla24xx_process_response_queue(vha, rsp);
2527 
2528 	spin_unlock_irqrestore(&ha->hardware_lock, flags);
2529 	return QLA_SUCCESS;
2530 
2531 queuing_error_fcp_cmnd:
2532 	dma_pool_free(ha->fcp_cmnd_dma_pool, ctx->fcp_cmnd, ctx->fcp_cmnd_dma);
2533 queuing_error:
2534 	if (tot_dsds)
2535 		scsi_dma_unmap(cmd);
2536 
2537 	if (sp->u.scmd.ctx) {
2538 		mempool_free(sp->u.scmd.ctx, ha->ctx_mempool);
2539 		sp->u.scmd.ctx = NULL;
2540 	}
2541 	spin_unlock_irqrestore(&ha->hardware_lock, flags);
2542 
2543 	return QLA_FUNCTION_FAILED;
2544 }
2545 
2546 static void
2547 qla24xx_abort_iocb(srb_t *sp, struct abort_entry_24xx *abt_iocb)
2548 {
2549 	struct srb_iocb *aio = &sp->u.iocb_cmd;
2550 	scsi_qla_host_t *vha = sp->fcport->vha;
2551 	struct req_que *req = vha->req;
2552 
2553 	memset(abt_iocb, 0, sizeof(struct abort_entry_24xx));
2554 	abt_iocb->entry_type = ABORT_IOCB_TYPE;
2555 	abt_iocb->entry_count = 1;
2556 	abt_iocb->handle = cpu_to_le32(MAKE_HANDLE(req->id, sp->handle));
2557 	abt_iocb->nport_handle = cpu_to_le16(sp->fcport->loop_id);
2558 	abt_iocb->handle_to_abort =
2559 	    cpu_to_le32(MAKE_HANDLE(req->id, aio->u.abt.cmd_hndl));
2560 	abt_iocb->port_id[0] = sp->fcport->d_id.b.al_pa;
2561 	abt_iocb->port_id[1] = sp->fcport->d_id.b.area;
2562 	abt_iocb->port_id[2] = sp->fcport->d_id.b.domain;
2563 	abt_iocb->vp_index = vha->vp_idx;
2564 	abt_iocb->req_que_no = cpu_to_le16(req->id);
2565 	/* Send the command to the firmware */
2566 	wmb();
2567 }
2568 
2569 int
2570 qla2x00_start_sp(srb_t *sp)
2571 {
2572 	int rval;
2573 	struct qla_hw_data *ha = sp->fcport->vha->hw;
2574 	void *pkt;
2575 	unsigned long flags;
2576 
2577 	rval = QLA_FUNCTION_FAILED;
2578 	spin_lock_irqsave(&ha->hardware_lock, flags);
2579 	pkt = qla2x00_alloc_iocbs(sp->fcport->vha, sp);
2580 	if (!pkt) {
2581 		ql_log(ql_log_warn, sp->fcport->vha, 0x700c,
2582 		    "qla2x00_alloc_iocbs failed.\n");
2583 		goto done;
2584 	}
2585 
2586 	rval = QLA_SUCCESS;
2587 	switch (sp->type) {
2588 	case SRB_LOGIN_CMD:
2589 		IS_FWI2_CAPABLE(ha) ?
2590 		    qla24xx_login_iocb(sp, pkt) :
2591 		    qla2x00_login_iocb(sp, pkt);
2592 		break;
2593 	case SRB_LOGOUT_CMD:
2594 		IS_FWI2_CAPABLE(ha) ?
2595 		    qla24xx_logout_iocb(sp, pkt) :
2596 		    qla2x00_logout_iocb(sp, pkt);
2597 		break;
2598 	case SRB_ELS_CMD_RPT:
2599 	case SRB_ELS_CMD_HST:
2600 		qla24xx_els_iocb(sp, pkt);
2601 		break;
2602 	case SRB_CT_CMD:
2603 		IS_FWI2_CAPABLE(ha) ?
2604 		    qla24xx_ct_iocb(sp, pkt) :
2605 		    qla2x00_ct_iocb(sp, pkt);
2606 		break;
2607 	case SRB_ADISC_CMD:
2608 		IS_FWI2_CAPABLE(ha) ?
2609 		    qla24xx_adisc_iocb(sp, pkt) :
2610 		    qla2x00_adisc_iocb(sp, pkt);
2611 		break;
2612 	case SRB_TM_CMD:
2613 		IS_QLAFX00(ha) ?
2614 		    qlafx00_tm_iocb(sp, pkt) :
2615 		    qla24xx_tm_iocb(sp, pkt);
2616 		break;
2617 	case SRB_FXIOCB_DCMD:
2618 	case SRB_FXIOCB_BCMD:
2619 		qlafx00_fxdisc_iocb(sp, pkt);
2620 		break;
2621 	case SRB_ABT_CMD:
2622 		IS_QLAFX00(ha) ?
2623 			qlafx00_abort_iocb(sp, pkt) :
2624 			qla24xx_abort_iocb(sp, pkt);
2625 		break;
2626 	default:
2627 		break;
2628 	}
2629 
2630 	wmb();
2631 	qla2x00_start_iocbs(sp->fcport->vha, ha->req_q_map[0]);
2632 done:
2633 	spin_unlock_irqrestore(&ha->hardware_lock, flags);
2634 	return rval;
2635 }
2636 
2637 static void
2638 qla25xx_build_bidir_iocb(srb_t *sp, struct scsi_qla_host *vha,
2639 				struct cmd_bidir *cmd_pkt, uint32_t tot_dsds)
2640 {
2641 	uint16_t avail_dsds;
2642 	uint32_t *cur_dsd;
2643 	uint32_t req_data_len = 0;
2644 	uint32_t rsp_data_len = 0;
2645 	struct scatterlist *sg;
2646 	int index;
2647 	int entry_count = 1;
2648 	struct fc_bsg_job *bsg_job = sp->u.bsg_job;
2649 
2650 	/*Update entry type to indicate bidir command */
2651 	*((uint32_t *)(&cmd_pkt->entry_type)) =
2652 		cpu_to_le32(COMMAND_BIDIRECTIONAL);
2653 
2654 	/* Set the transfer direction, in this set both flags
2655 	 * Also set the BD_WRAP_BACK flag, firmware will take care
2656 	 * assigning DID=SID for outgoing pkts.
2657 	 */
2658 	cmd_pkt->wr_dseg_count = cpu_to_le16(bsg_job->request_payload.sg_cnt);
2659 	cmd_pkt->rd_dseg_count = cpu_to_le16(bsg_job->reply_payload.sg_cnt);
2660 	cmd_pkt->control_flags = cpu_to_le16(BD_WRITE_DATA | BD_READ_DATA |
2661 							BD_WRAP_BACK);
2662 
2663 	req_data_len = rsp_data_len = bsg_job->request_payload.payload_len;
2664 	cmd_pkt->wr_byte_count = cpu_to_le32(req_data_len);
2665 	cmd_pkt->rd_byte_count = cpu_to_le32(rsp_data_len);
2666 	cmd_pkt->timeout = cpu_to_le16(qla2x00_get_async_timeout(vha) + 2);
2667 
2668 	vha->bidi_stats.transfer_bytes += req_data_len;
2669 	vha->bidi_stats.io_count++;
2670 
2671 	vha->qla_stats.output_bytes += req_data_len;
2672 	vha->qla_stats.output_requests++;
2673 
2674 	/* Only one dsd is available for bidirectional IOCB, remaining dsds
2675 	 * are bundled in continuation iocb
2676 	 */
2677 	avail_dsds = 1;
2678 	cur_dsd = (uint32_t *)&cmd_pkt->fcp_data_dseg_address;
2679 
2680 	index = 0;
2681 
2682 	for_each_sg(bsg_job->request_payload.sg_list, sg,
2683 				bsg_job->request_payload.sg_cnt, index) {
2684 		dma_addr_t sle_dma;
2685 		cont_a64_entry_t *cont_pkt;
2686 
2687 		/* Allocate additional continuation packets */
2688 		if (avail_dsds == 0) {
2689 			/* Continuation type 1 IOCB can accomodate
2690 			 * 5 DSDS
2691 			 */
2692 			cont_pkt = qla2x00_prep_cont_type1_iocb(vha, vha->req);
2693 			cur_dsd = (uint32_t *) cont_pkt->dseg_0_address;
2694 			avail_dsds = 5;
2695 			entry_count++;
2696 		}
2697 		sle_dma = sg_dma_address(sg);
2698 		*cur_dsd++   = cpu_to_le32(LSD(sle_dma));
2699 		*cur_dsd++   = cpu_to_le32(MSD(sle_dma));
2700 		*cur_dsd++   = cpu_to_le32(sg_dma_len(sg));
2701 		avail_dsds--;
2702 	}
2703 	/* For read request DSD will always goes to continuation IOCB
2704 	 * and follow the write DSD. If there is room on the current IOCB
2705 	 * then it is added to that IOCB else new continuation IOCB is
2706 	 * allocated.
2707 	 */
2708 	for_each_sg(bsg_job->reply_payload.sg_list, sg,
2709 				bsg_job->reply_payload.sg_cnt, index) {
2710 		dma_addr_t sle_dma;
2711 		cont_a64_entry_t *cont_pkt;
2712 
2713 		/* Allocate additional continuation packets */
2714 		if (avail_dsds == 0) {
2715 			/* Continuation type 1 IOCB can accomodate
2716 			 * 5 DSDS
2717 			 */
2718 			cont_pkt = qla2x00_prep_cont_type1_iocb(vha, vha->req);
2719 			cur_dsd = (uint32_t *) cont_pkt->dseg_0_address;
2720 			avail_dsds = 5;
2721 			entry_count++;
2722 		}
2723 		sle_dma = sg_dma_address(sg);
2724 		*cur_dsd++   = cpu_to_le32(LSD(sle_dma));
2725 		*cur_dsd++   = cpu_to_le32(MSD(sle_dma));
2726 		*cur_dsd++   = cpu_to_le32(sg_dma_len(sg));
2727 		avail_dsds--;
2728 	}
2729 	/* This value should be same as number of IOCB required for this cmd */
2730 	cmd_pkt->entry_count = entry_count;
2731 }
2732 
2733 int
2734 qla2x00_start_bidir(srb_t *sp, struct scsi_qla_host *vha, uint32_t tot_dsds)
2735 {
2736 
2737 	struct qla_hw_data *ha = vha->hw;
2738 	unsigned long flags;
2739 	uint32_t handle;
2740 	uint32_t index;
2741 	uint16_t req_cnt;
2742 	uint16_t cnt;
2743 	uint32_t *clr_ptr;
2744 	struct cmd_bidir *cmd_pkt = NULL;
2745 	struct rsp_que *rsp;
2746 	struct req_que *req;
2747 	int rval = EXT_STATUS_OK;
2748 
2749 	rval = QLA_SUCCESS;
2750 
2751 	rsp = ha->rsp_q_map[0];
2752 	req = vha->req;
2753 
2754 	/* Send marker if required */
2755 	if (vha->marker_needed != 0) {
2756 		if (qla2x00_marker(vha, req,
2757 			rsp, 0, 0, MK_SYNC_ALL) != QLA_SUCCESS)
2758 			return EXT_STATUS_MAILBOX;
2759 		vha->marker_needed = 0;
2760 	}
2761 
2762 	/* Acquire ring specific lock */
2763 	spin_lock_irqsave(&ha->hardware_lock, flags);
2764 
2765 	/* Check for room in outstanding command list. */
2766 	handle = req->current_outstanding_cmd;
2767 	for (index = 1; index < req->num_outstanding_cmds; index++) {
2768 		handle++;
2769 		if (handle == req->num_outstanding_cmds)
2770 			handle = 1;
2771 		if (!req->outstanding_cmds[handle])
2772 			break;
2773 	}
2774 
2775 	if (index == req->num_outstanding_cmds) {
2776 		rval = EXT_STATUS_BUSY;
2777 		goto queuing_error;
2778 	}
2779 
2780 	/* Calculate number of IOCB required */
2781 	req_cnt = qla24xx_calc_iocbs(vha, tot_dsds);
2782 
2783 	/* Check for room on request queue. */
2784 	if (req->cnt < req_cnt + 2) {
2785 		cnt = IS_SHADOW_REG_CAPABLE(ha) ? *req->out_ptr :
2786 		    RD_REG_DWORD_RELAXED(req->req_q_out);
2787 		if  (req->ring_index < cnt)
2788 			req->cnt = cnt - req->ring_index;
2789 		else
2790 			req->cnt = req->length -
2791 				(req->ring_index - cnt);
2792 	}
2793 	if (req->cnt < req_cnt + 2) {
2794 		rval = EXT_STATUS_BUSY;
2795 		goto queuing_error;
2796 	}
2797 
2798 	cmd_pkt = (struct cmd_bidir *)req->ring_ptr;
2799 	cmd_pkt->handle = MAKE_HANDLE(req->id, handle);
2800 
2801 	/* Zero out remaining portion of packet. */
2802 	/* tagged queuing modifier -- default is TSK_SIMPLE (0).*/
2803 	clr_ptr = (uint32_t *)cmd_pkt + 2;
2804 	memset(clr_ptr, 0, REQUEST_ENTRY_SIZE - 8);
2805 
2806 	/* Set NPORT-ID  (of vha)*/
2807 	cmd_pkt->nport_handle = cpu_to_le16(vha->self_login_loop_id);
2808 	cmd_pkt->port_id[0] = vha->d_id.b.al_pa;
2809 	cmd_pkt->port_id[1] = vha->d_id.b.area;
2810 	cmd_pkt->port_id[2] = vha->d_id.b.domain;
2811 
2812 	qla25xx_build_bidir_iocb(sp, vha, cmd_pkt, tot_dsds);
2813 	cmd_pkt->entry_status = (uint8_t) rsp->id;
2814 	/* Build command packet. */
2815 	req->current_outstanding_cmd = handle;
2816 	req->outstanding_cmds[handle] = sp;
2817 	sp->handle = handle;
2818 	req->cnt -= req_cnt;
2819 
2820 	/* Send the command to the firmware */
2821 	wmb();
2822 	qla2x00_start_iocbs(vha, req);
2823 queuing_error:
2824 	spin_unlock_irqrestore(&ha->hardware_lock, flags);
2825 	return rval;
2826 }
2827