1/*
2 * Copyright 2014 Cisco Systems, Inc.  All rights reserved.
3 *
4 * This program is free software; you may redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 2 of the License.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
9 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
10 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
11 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
12 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
13 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
14 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
15 * SOFTWARE.
16 */
17
18#include <linux/errno.h>
19#include <linux/pci.h>
20#include <linux/slab.h>
21
22#include <linux/interrupt.h>
23#include <linux/workqueue.h>
24#include <linux/spinlock.h>
25#include <linux/mempool.h>
26#include <scsi/scsi_tcq.h>
27
28#include "snic_io.h"
29#include "snic.h"
30#include "cq_enet_desc.h"
31#include "snic_fwint.h"
32
33static void
34snic_wq_cmpl_frame_send(struct vnic_wq *wq,
35			    struct cq_desc *cq_desc,
36			    struct vnic_wq_buf *buf,
37			    void *opaque)
38{
39	struct snic *snic = svnic_dev_priv(wq->vdev);
40
41	SNIC_BUG_ON(buf->os_buf == NULL);
42
43	if (snic_log_level & SNIC_DESC_LOGGING)
44		SNIC_HOST_INFO(snic->shost,
45			       "Ack received for snic_host_req %p.\n",
46			       buf->os_buf);
47
48	SNIC_TRC(snic->shost->host_no, 0, 0,
49		 ((ulong)(buf->os_buf) - sizeof(struct snic_req_info)), 0, 0,
50		 0);
51	pci_unmap_single(snic->pdev, buf->dma_addr, buf->len, PCI_DMA_TODEVICE);
52	buf->os_buf = NULL;
53}
54
55static int
56snic_wq_cmpl_handler_cont(struct vnic_dev *vdev,
57			  struct cq_desc *cq_desc,
58			  u8 type,
59			  u16 q_num,
60			  u16 cmpl_idx,
61			  void *opaque)
62{
63	struct snic *snic = svnic_dev_priv(vdev);
64	unsigned long flags;
65
66	SNIC_BUG_ON(q_num != 0);
67
68	spin_lock_irqsave(&snic->wq_lock[q_num], flags);
69	svnic_wq_service(&snic->wq[q_num],
70			 cq_desc,
71			 cmpl_idx,
72			 snic_wq_cmpl_frame_send,
73			 NULL);
74	spin_unlock_irqrestore(&snic->wq_lock[q_num], flags);
75
76	return 0;
77} /* end of snic_cmpl_handler_cont */
78
79int
80snic_wq_cmpl_handler(struct snic *snic, int work_to_do)
81{
82	unsigned int work_done = 0;
83	unsigned int i;
84
85	snic->s_stats.misc.last_ack_time = jiffies;
86	for (i = 0; i < snic->wq_count; i++) {
87		work_done += svnic_cq_service(&snic->cq[i],
88					      work_to_do,
89					      snic_wq_cmpl_handler_cont,
90					      NULL);
91	}
92
93	return work_done;
94} /* end of snic_wq_cmpl_handler */
95
96void
97snic_free_wq_buf(struct vnic_wq *wq, struct vnic_wq_buf *buf)
98{
99
100	struct snic_host_req *req = buf->os_buf;
101	struct snic *snic = svnic_dev_priv(wq->vdev);
102	struct snic_req_info *rqi = NULL;
103	unsigned long flags;
104
105	pci_unmap_single(snic->pdev, buf->dma_addr, buf->len, PCI_DMA_TODEVICE);
106
107	rqi = req_to_rqi(req);
108	spin_lock_irqsave(&snic->spl_cmd_lock, flags);
109	if (list_empty(&rqi->list)) {
110		spin_unlock_irqrestore(&snic->spl_cmd_lock, flags);
111		goto end;
112	}
113
114	SNIC_BUG_ON(rqi->list.next == NULL); /* if not added to spl_cmd_list */
115	list_del_init(&rqi->list);
116	spin_unlock_irqrestore(&snic->spl_cmd_lock, flags);
117
118	if (rqi->sge_va) {
119		snic_pci_unmap_rsp_buf(snic, rqi);
120		kfree((void *)rqi->sge_va);
121		rqi->sge_va = 0;
122	}
123	snic_req_free(snic, rqi);
124	SNIC_HOST_INFO(snic->shost, "snic_free_wq_buf .. freed.\n");
125
126end:
127	return;
128}
129
130/* Criteria to select work queue in multi queue mode */
131static int
132snic_select_wq(struct snic *snic)
133{
134	/* No multi queue support for now */
135	BUILD_BUG_ON(SNIC_WQ_MAX > 1);
136
137	return 0;
138}
139
140int
141snic_queue_wq_desc(struct snic *snic, void *os_buf, u16 len)
142{
143	dma_addr_t pa = 0;
144	unsigned long flags;
145	struct snic_fw_stats *fwstats = &snic->s_stats.fw;
146	long act_reqs;
147	int q_num = 0;
148
149	snic_print_desc(__func__, os_buf, len);
150
151	/* Map request buffer */
152	pa = pci_map_single(snic->pdev, os_buf, len, PCI_DMA_TODEVICE);
153	if (pci_dma_mapping_error(snic->pdev, pa)) {
154		SNIC_HOST_ERR(snic->shost, "qdesc: PCI DMA Mapping Fail.\n");
155
156		return -ENOMEM;
157	}
158
159	q_num = snic_select_wq(snic);
160
161	spin_lock_irqsave(&snic->wq_lock[q_num], flags);
162	if (!svnic_wq_desc_avail(snic->wq)) {
163		pci_unmap_single(snic->pdev, pa, len, PCI_DMA_TODEVICE);
164		spin_unlock_irqrestore(&snic->wq_lock[q_num], flags);
165		atomic64_inc(&snic->s_stats.misc.wq_alloc_fail);
166		SNIC_DBG("host = %d, WQ is Full\n", snic->shost->host_no);
167
168		return -ENOMEM;
169	}
170
171	snic_queue_wq_eth_desc(&snic->wq[q_num], os_buf, pa, len, 0, 0, 1);
172	spin_unlock_irqrestore(&snic->wq_lock[q_num], flags);
173
174	/* Update stats */
175	act_reqs = atomic64_inc_return(&fwstats->actv_reqs);
176	if (act_reqs > atomic64_read(&fwstats->max_actv_reqs))
177		atomic64_set(&fwstats->max_actv_reqs, act_reqs);
178
179	return 0;
180} /* end of snic_queue_wq_desc() */
181
182/*
183 * snic_handle_untagged_req: Adds snic specific requests to spl_cmd_list.
184 * Purpose : Used during driver unload to clean up the requests.
185 */
186void
187snic_handle_untagged_req(struct snic *snic, struct snic_req_info *rqi)
188{
189	unsigned long flags;
190
191	INIT_LIST_HEAD(&rqi->list);
192
193	spin_lock_irqsave(&snic->spl_cmd_lock, flags);
194	list_add_tail(&rqi->list, &snic->spl_cmd_list);
195	spin_unlock_irqrestore(&snic->spl_cmd_lock, flags);
196}
197
198/*
199 * snic_req_init:
200 * Allocates snic_req_info + snic_host_req + sgl data, and initializes.
201 */
202struct snic_req_info *
203snic_req_init(struct snic *snic, int sg_cnt)
204{
205	u8 typ;
206	struct snic_req_info *rqi = NULL;
207
208	typ = (sg_cnt <= SNIC_REQ_CACHE_DFLT_SGL) ?
209		SNIC_REQ_CACHE_DFLT_SGL : SNIC_REQ_CACHE_MAX_SGL;
210
211	rqi = mempool_alloc(snic->req_pool[typ], GFP_ATOMIC);
212	if (!rqi) {
213		atomic64_inc(&snic->s_stats.io.alloc_fail);
214		SNIC_HOST_ERR(snic->shost,
215			      "Failed to allocate memory from snic req pool id = %d\n",
216			      typ);
217		return rqi;
218	}
219
220	memset(rqi, 0, sizeof(*rqi));
221	rqi->rq_pool_type = typ;
222	rqi->start_time = jiffies;
223	rqi->req = (struct snic_host_req *) (rqi + 1);
224	rqi->req_len = sizeof(struct snic_host_req);
225	rqi->snic = snic;
226
227	rqi->req = (struct snic_host_req *)(rqi + 1);
228
229	if (sg_cnt == 0)
230		goto end;
231
232	rqi->req_len += (sg_cnt * sizeof(struct snic_sg_desc));
233
234	if (sg_cnt > atomic64_read(&snic->s_stats.io.max_sgl))
235		atomic64_set(&snic->s_stats.io.max_sgl, sg_cnt);
236
237	SNIC_BUG_ON(sg_cnt > SNIC_MAX_SG_DESC_CNT);
238	atomic64_inc(&snic->s_stats.io.sgl_cnt[sg_cnt - 1]);
239
240end:
241	memset(rqi->req, 0, rqi->req_len);
242
243	/* pre initialization of init_ctx to support req_to_rqi */
244	rqi->req->hdr.init_ctx = (ulong) rqi;
245
246	SNIC_SCSI_DBG(snic->shost, "Req_alloc:rqi = %p allocatd.\n", rqi);
247
248	return rqi;
249} /* end of snic_req_init */
250
251/*
252 * snic_abort_req_init : Inits abort request.
253 */
254struct snic_host_req *
255snic_abort_req_init(struct snic *snic, struct snic_req_info *rqi)
256{
257	struct snic_host_req *req = NULL;
258
259	SNIC_BUG_ON(!rqi);
260
261	/* If abort to be issued second time, then reuse */
262	if (rqi->abort_req)
263		return rqi->abort_req;
264
265
266	req = mempool_alloc(snic->req_pool[SNIC_REQ_TM_CACHE], GFP_ATOMIC);
267	if (!req) {
268		SNIC_HOST_ERR(snic->shost, "abts:Failed to alloc tm req.\n");
269		WARN_ON_ONCE(1);
270
271		return NULL;
272	}
273
274	rqi->abort_req = req;
275	memset(req, 0, sizeof(struct snic_host_req));
276	/* pre initialization of init_ctx to support req_to_rqi */
277	req->hdr.init_ctx = (ulong) rqi;
278
279	return req;
280} /* end of snic_abort_req_init */
281
282/*
283 * snic_dr_req_init : Inits device reset req
284 */
285struct snic_host_req *
286snic_dr_req_init(struct snic *snic, struct snic_req_info *rqi)
287{
288	struct snic_host_req *req = NULL;
289
290	SNIC_BUG_ON(!rqi);
291
292	req = mempool_alloc(snic->req_pool[SNIC_REQ_TM_CACHE], GFP_ATOMIC);
293	if (!req) {
294		SNIC_HOST_ERR(snic->shost, "dr:Failed to alloc tm req.\n");
295		WARN_ON_ONCE(1);
296
297		return NULL;
298	}
299
300	SNIC_BUG_ON(rqi->dr_req != NULL);
301	rqi->dr_req = req;
302	memset(req, 0, sizeof(struct snic_host_req));
303	/* pre initialization of init_ctx to support req_to_rqi */
304	req->hdr.init_ctx = (ulong) rqi;
305
306	return req;
307} /* end of snic_dr_req_init */
308
309/* frees snic_req_info and snic_host_req */
310void
311snic_req_free(struct snic *snic, struct snic_req_info *rqi)
312{
313	SNIC_BUG_ON(rqi->req == rqi->abort_req);
314	SNIC_BUG_ON(rqi->req == rqi->dr_req);
315	SNIC_BUG_ON(rqi->sge_va != 0);
316
317	SNIC_SCSI_DBG(snic->shost,
318		      "Req_free:rqi %p:ioreq %p:abt %p:dr %p\n",
319		      rqi, rqi->req, rqi->abort_req, rqi->dr_req);
320
321	if (rqi->abort_req)
322		mempool_free(rqi->abort_req, snic->req_pool[SNIC_REQ_TM_CACHE]);
323
324	if (rqi->dr_req)
325		mempool_free(rqi->dr_req, snic->req_pool[SNIC_REQ_TM_CACHE]);
326
327	mempool_free(rqi, snic->req_pool[rqi->rq_pool_type]);
328}
329
330void
331snic_pci_unmap_rsp_buf(struct snic *snic, struct snic_req_info *rqi)
332{
333	struct snic_sg_desc *sgd;
334
335	sgd = req_to_sgl(rqi_to_req(rqi));
336	SNIC_BUG_ON(sgd[0].addr == 0);
337	pci_unmap_single(snic->pdev,
338			 le64_to_cpu(sgd[0].addr),
339			 le32_to_cpu(sgd[0].len),
340			 PCI_DMA_FROMDEVICE);
341}
342
343/*
344 * snic_free_all_untagged_reqs: Walks through untagged reqs and frees them.
345 */
346void
347snic_free_all_untagged_reqs(struct snic *snic)
348{
349	struct snic_req_info *rqi;
350	struct list_head *cur, *nxt;
351	unsigned long flags;
352
353	spin_lock_irqsave(&snic->spl_cmd_lock, flags);
354	list_for_each_safe(cur, nxt, &snic->spl_cmd_list) {
355		rqi = list_entry(cur, struct snic_req_info, list);
356		list_del_init(&rqi->list);
357		if (rqi->sge_va) {
358			snic_pci_unmap_rsp_buf(snic, rqi);
359			kfree((void *)rqi->sge_va);
360			rqi->sge_va = 0;
361		}
362
363		snic_req_free(snic, rqi);
364	}
365	spin_unlock_irqrestore(&snic->spl_cmd_lock, flags);
366}
367
368/*
369 * snic_release_untagged_req : Unlinks the untagged req and frees it.
370 */
371void
372snic_release_untagged_req(struct snic *snic, struct snic_req_info *rqi)
373{
374	unsigned long flags;
375
376	spin_lock_irqsave(&snic->snic_lock, flags);
377	if (snic->in_remove) {
378		spin_unlock_irqrestore(&snic->snic_lock, flags);
379		goto end;
380	}
381	spin_unlock_irqrestore(&snic->snic_lock, flags);
382
383	spin_lock_irqsave(&snic->spl_cmd_lock, flags);
384	if (list_empty(&rqi->list)) {
385		spin_unlock_irqrestore(&snic->spl_cmd_lock, flags);
386		goto end;
387	}
388	list_del_init(&rqi->list);
389	spin_unlock_irqrestore(&snic->spl_cmd_lock, flags);
390	snic_req_free(snic, rqi);
391
392end:
393	return;
394}
395
396/* dump buf in hex fmt */
397void
398snic_hex_dump(char *pfx, char *data, int len)
399{
400	SNIC_INFO("%s Dumping Data of Len = %d\n", pfx, len);
401	print_hex_dump_bytes(pfx, DUMP_PREFIX_NONE, data, len);
402}
403
404#define	LINE_BUFSZ	128	/* for snic_print_desc fn */
405static void
406snic_dump_desc(const char *fn, char *os_buf, int len)
407{
408	struct snic_host_req *req = (struct snic_host_req *) os_buf;
409	struct snic_fw_req *fwreq = (struct snic_fw_req *) os_buf;
410	struct snic_req_info *rqi = NULL;
411	char line[LINE_BUFSZ] = { '\0' };
412	char *cmd_str = NULL;
413
414	if (req->hdr.type >= SNIC_RSP_REPORT_TGTS_CMPL)
415		rqi = (struct snic_req_info *) fwreq->hdr.init_ctx;
416	else
417		rqi = (struct snic_req_info *) req->hdr.init_ctx;
418
419	SNIC_BUG_ON(rqi == NULL || rqi->req == NULL);
420	switch (req->hdr.type) {
421	case SNIC_REQ_REPORT_TGTS:
422		cmd_str = "report-tgt : ";
423		snprintf(line, LINE_BUFSZ, "SNIC_REQ_REPORT_TGTS :");
424		break;
425
426	case SNIC_REQ_ICMND:
427		cmd_str = "icmnd : ";
428		snprintf(line, LINE_BUFSZ, "SNIC_REQ_ICMND : 0x%x :",
429			 req->u.icmnd.cdb[0]);
430		break;
431
432	case SNIC_REQ_ITMF:
433		cmd_str = "itmf : ";
434		snprintf(line, LINE_BUFSZ, "SNIC_REQ_ITMF :");
435		break;
436
437	case SNIC_REQ_HBA_RESET:
438		cmd_str = "hba reset :";
439		snprintf(line, LINE_BUFSZ, "SNIC_REQ_HBA_RESET :");
440		break;
441
442	case SNIC_REQ_EXCH_VER:
443		cmd_str = "exch ver : ";
444		snprintf(line, LINE_BUFSZ, "SNIC_REQ_EXCH_VER :");
445		break;
446
447	case SNIC_REQ_TGT_INFO:
448		cmd_str = "tgt info : ";
449		break;
450
451	case SNIC_RSP_REPORT_TGTS_CMPL:
452		cmd_str = "report tgt cmpl : ";
453		snprintf(line, LINE_BUFSZ, "SNIC_RSP_REPORT_TGTS_CMPL :");
454		break;
455
456	case SNIC_RSP_ICMND_CMPL:
457		cmd_str = "icmnd_cmpl : ";
458		snprintf(line, LINE_BUFSZ, "SNIC_RSP_ICMND_CMPL : 0x%x :",
459			 rqi->req->u.icmnd.cdb[0]);
460		break;
461
462	case SNIC_RSP_ITMF_CMPL:
463		cmd_str = "itmf_cmpl : ";
464		snprintf(line, LINE_BUFSZ, "SNIC_RSP_ITMF_CMPL :");
465		break;
466
467	case SNIC_RSP_HBA_RESET_CMPL:
468		cmd_str = "hba_reset_cmpl : ";
469		snprintf(line, LINE_BUFSZ, "SNIC_RSP_HBA_RESET_CMPL :");
470		break;
471
472	case SNIC_RSP_EXCH_VER_CMPL:
473		cmd_str = "exch_ver_cmpl : ";
474		snprintf(line, LINE_BUFSZ, "SNIC_RSP_EXCH_VER_CMPL :");
475		break;
476
477	case SNIC_MSG_ACK:
478		cmd_str = "msg ack : ";
479		snprintf(line, LINE_BUFSZ, "SNIC_MSG_ACK :");
480		break;
481
482	case SNIC_MSG_ASYNC_EVNOTIFY:
483		cmd_str = "async notify : ";
484		snprintf(line, LINE_BUFSZ, "SNIC_MSG_ASYNC_EVNOTIFY :");
485		break;
486
487	default:
488		cmd_str = "unknown : ";
489		SNIC_BUG_ON(1);
490		break;
491	}
492
493	SNIC_INFO("%s:%s >>cmndid=%x:sg_cnt = %x:status = %x:ctx = %lx.\n",
494		  fn, line, req->hdr.cmnd_id, req->hdr.sg_cnt, req->hdr.status,
495		  req->hdr.init_ctx);
496
497	/* Enable it, to dump byte stream */
498	if (snic_log_level & 0x20)
499		snic_hex_dump(cmd_str, os_buf, len);
500} /* end of __snic_print_desc */
501
502void
503snic_print_desc(const char *fn, char *os_buf, int len)
504{
505	if (snic_log_level & SNIC_DESC_LOGGING)
506		snic_dump_desc(fn, os_buf, len);
507}
508
509void
510snic_calc_io_process_time(struct snic *snic, struct snic_req_info *rqi)
511{
512	u64 duration;
513
514	duration = jiffies - rqi->start_time;
515
516	if (duration > atomic64_read(&snic->s_stats.io.max_time))
517		atomic64_set(&snic->s_stats.io.max_time, duration);
518}
519