[deliverable/linux.git] / drivers / scsi / snic / snic_io.c

/*
 * Copyright 2014 Cisco Systems, Inc.  All rights reserved.
 *
 * This program is free software; you may redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/errno.h>
#include <linux/pci.h>
#include <linux/slab.h>

#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include <linux/spinlock.h>
#include <linux/mempool.h>
#include <scsi/scsi_tcq.h>

#include "snic_io.h"
#include "snic.h"
#include "cq_enet_desc.h"
#include "snic_fwint.h"

static void
snic_wq_cmpl_frame_send(struct vnic_wq *wq,
			    struct cq_desc *cq_desc,
			    struct vnic_wq_buf *buf,
			    void *opaque)
{
	struct snic *snic = svnic_dev_priv(wq->vdev);

	SNIC_BUG_ON(buf->os_buf == NULL);

	if (snic_log_level & SNIC_DESC_LOGGING)
		SNIC_HOST_INFO(snic->shost,
			       "Ack received for snic_host_req %p.\n",
			       buf->os_buf);

	SNIC_TRC(snic->shost->host_no, 0, 0,
		 ((ulong)(buf->os_buf) - sizeof(struct snic_req_info)), 0, 0,
		 0);
	pci_unmap_single(snic->pdev, buf->dma_addr, buf->len, PCI_DMA_TODEVICE);
	buf->os_buf = NULL;
}

static int
snic_wq_cmpl_handler_cont(struct vnic_dev *vdev,
			  struct cq_desc *cq_desc,
			  u8 type,
			  u16 q_num,
			  u16 cmpl_idx,
			  void *opaque)
{
	struct snic *snic = svnic_dev_priv(vdev);
	unsigned long flags;

	SNIC_BUG_ON(q_num != 0);

	spin_lock_irqsave(&snic->wq_lock[q_num], flags);
	svnic_wq_service(&snic->wq[q_num],
			 cq_desc,
			 cmpl_idx,
			 snic_wq_cmpl_frame_send,
			 NULL);
	spin_unlock_irqrestore(&snic->wq_lock[q_num], flags);

	return 0;
} /* end of snic_cmpl_handler_cont */

int
snic_wq_cmpl_handler(struct snic *snic, int work_to_do)
{
	unsigned int work_done = 0;
	unsigned int i;

	snic->s_stats.misc.last_ack_time = jiffies;
	for (i = 0; i < snic->wq_count; i++) {
		work_done += svnic_cq_service(&snic->cq[i],
					      work_to_do,
					      snic_wq_cmpl_handler_cont,
					      NULL);
	}

	return work_done;
} /* end of snic_wq_cmpl_handler */

void
snic_free_wq_buf(struct vnic_wq *wq, struct vnic_wq_buf *buf)
{

	struct snic_host_req *req = buf->os_buf;
	struct snic *snic = svnic_dev_priv(wq->vdev);
	struct snic_req_info *rqi = NULL;
	unsigned long flags;

	pci_unmap_single(snic->pdev, buf->dma_addr, buf->len, PCI_DMA_TODEVICE);

	rqi = req_to_rqi(req);
	spin_lock_irqsave(&snic->spl_cmd_lock, flags);
	if (list_empty(&rqi->list)) {
		spin_unlock_irqrestore(&snic->spl_cmd_lock, flags);
		goto end;
	}

	SNIC_BUG_ON(rqi->list.next == NULL); /* if not added to spl_cmd_list */
	list_del_init(&rqi->list);
	spin_unlock_irqrestore(&snic->spl_cmd_lock, flags);

	if (rqi->sge_va) {
		snic_pci_unmap_rsp_buf(snic, rqi);
		kfree((void *)rqi->sge_va);
		rqi->sge_va = 0;
	}
	snic_req_free(snic, rqi);
	SNIC_HOST_INFO(snic->shost, "snic_free_wq_buf .. freed.\n");

end:
	return;
}

/* Criteria to select work queue in multi queue mode */
static int
snic_select_wq(struct snic *snic)
{
	/* No multi queue support for now */
	BUILD_BUG_ON(SNIC_WQ_MAX > 1);

	return 0;
}

int
snic_queue_wq_desc(struct snic *snic, void *os_buf, u16 len)
{
	dma_addr_t pa = 0;
	unsigned long flags;
	struct snic_fw_stats *fwstats = &snic->s_stats.fw;
	long act_reqs;
	int q_num = 0;

	snic_print_desc(__func__, os_buf, len);

	/* Map request buffer */
	pa = pci_map_single(snic->pdev, os_buf, len, PCI_DMA_TODEVICE);
	if (pci_dma_mapping_error(snic->pdev, pa)) {
		SNIC_HOST_ERR(snic->shost, "qdesc: PCI DMA Mapping Fail.\n");

		return -ENOMEM;
	}

	q_num = snic_select_wq(snic);

	spin_lock_irqsave(&snic->wq_lock[q_num], flags);
	if (!svnic_wq_desc_avail(snic->wq)) {
		pci_unmap_single(snic->pdev, pa, len, PCI_DMA_TODEVICE);
		spin_unlock_irqrestore(&snic->wq_lock[q_num], flags);
		atomic64_inc(&snic->s_stats.misc.wq_alloc_fail);
		SNIC_DBG("host = %d, WQ is Full\n", snic->shost->host_no);

		return -ENOMEM;
	}

	snic_queue_wq_eth_desc(&snic->wq[q_num], os_buf, pa, len, 0, 0, 1);
	spin_unlock_irqrestore(&snic->wq_lock[q_num], flags);

	/* Update stats */
	act_reqs = atomic64_inc_return(&fwstats->actv_reqs);
	if (act_reqs > atomic64_read(&fwstats->max_actv_reqs))
		atomic64_set(&fwstats->max_actv_reqs, act_reqs);

	return 0;
} /* end of snic_queue_wq_desc() */

/*
 * snic_handle_untagged_req: Adds snic specific requests to spl_cmd_list.
 * Purpose : Used during driver unload to clean up the requests.
 */
void
snic_handle_untagged_req(struct snic *snic, struct snic_req_info *rqi)
{
	unsigned long flags;

	INIT_LIST_HEAD(&rqi->list);

	spin_lock_irqsave(&snic->spl_cmd_lock, flags);
	list_add_tail(&rqi->list, &snic->spl_cmd_list);
	spin_unlock_irqrestore(&snic->spl_cmd_lock, flags);
}

/*
 * snic_req_init:
 * Allocates snic_req_info + snic_host_req + sgl data, and initializes.
 */
struct snic_req_info *
snic_req_init(struct snic *snic, int sg_cnt)
{
	u8 typ;
	struct snic_req_info *rqi = NULL;

	typ = (sg_cnt <= SNIC_REQ_CACHE_DFLT_SGL) ?
		SNIC_REQ_CACHE_DFLT_SGL : SNIC_REQ_CACHE_MAX_SGL;

	rqi = mempool_alloc(snic->req_pool[typ], GFP_ATOMIC);
	if (!rqi) {
		atomic64_inc(&snic->s_stats.io.alloc_fail);
		SNIC_HOST_ERR(snic->shost,
			      "Failed to allocate memory from snic req pool id = %d\n",
			      typ);
		return rqi;
	}

	memset(rqi, 0, sizeof(*rqi));
	rqi->rq_pool_type = typ;
	rqi->start_time = jiffies;
	rqi->req = (struct snic_host_req *) (rqi + 1);
	rqi->req_len = sizeof(struct snic_host_req);
	rqi->snic = snic;

	rqi->req = (struct snic_host_req *)(rqi + 1);

	if (sg_cnt == 0)
		goto end;

	rqi->req_len += (sg_cnt * sizeof(struct snic_sg_desc));

	if (sg_cnt > atomic64_read(&snic->s_stats.io.max_sgl))
		atomic64_set(&snic->s_stats.io.max_sgl, sg_cnt);

	SNIC_BUG_ON(sg_cnt > SNIC_MAX_SG_DESC_CNT);
	atomic64_inc(&snic->s_stats.io.sgl_cnt[sg_cnt - 1]);

end:
	memset(rqi->req, 0, rqi->req_len);

	/* pre initialization of init_ctx to support req_to_rqi */
	rqi->req->hdr.init_ctx = (ulong) rqi;

	SNIC_SCSI_DBG(snic->shost, "Req_alloc:rqi = %p allocatd.\n", rqi);

	return rqi;
} /* end of snic_req_init */

/*
 * snic_abort_req_init : Inits abort request.
 */
struct snic_host_req *
snic_abort_req_init(struct snic *snic, struct snic_req_info *rqi)
{
	struct snic_host_req *req = NULL;

	SNIC_BUG_ON(!rqi);

	/* If abort to be issued second time, then reuse */
	if (rqi->abort_req)
		return rqi->abort_req;


	req = mempool_alloc(snic->req_pool[SNIC_REQ_TM_CACHE], GFP_ATOMIC);
	if (!req) {
		SNIC_HOST_ERR(snic->shost, "abts:Failed to alloc tm req.\n");
		WARN_ON_ONCE(1);

		return NULL;
	}

	rqi->abort_req = req;
	memset(req, 0, sizeof(struct snic_host_req));
	/* pre initialization of init_ctx to support req_to_rqi */
	req->hdr.init_ctx = (ulong) rqi;

	return req;
} /* end of snic_abort_req_init */

/*
 * snic_dr_req_init : Inits device reset req
 */
struct snic_host_req *
snic_dr_req_init(struct snic *snic, struct snic_req_info *rqi)
{
	struct snic_host_req *req = NULL;

	SNIC_BUG_ON(!rqi);

	req = mempool_alloc(snic->req_pool[SNIC_REQ_TM_CACHE], GFP_ATOMIC);
	if (!req) {
		SNIC_HOST_ERR(snic->shost, "dr:Failed to alloc tm req.\n");
		WARN_ON_ONCE(1);

		return NULL;
	}

	SNIC_BUG_ON(rqi->dr_req != NULL);
	rqi->dr_req = req;
	memset(req, 0, sizeof(struct snic_host_req));
	/* pre initialization of init_ctx to support req_to_rqi */
	req->hdr.init_ctx = (ulong) rqi;

	return req;
} /* end of snic_dr_req_init */

/* frees snic_req_info and snic_host_req */
void
snic_req_free(struct snic *snic, struct snic_req_info *rqi)
{
	SNIC_BUG_ON(rqi->req == rqi->abort_req);
	SNIC_BUG_ON(rqi->req == rqi->dr_req);
	SNIC_BUG_ON(rqi->sge_va != 0);

	SNIC_SCSI_DBG(snic->shost,
		      "Req_free:rqi %p:ioreq %p:abt %p:dr %p\n",
		      rqi, rqi->req, rqi->abort_req, rqi->dr_req);

	if (rqi->abort_req)
		mempool_free(rqi->abort_req, snic->req_pool[SNIC_REQ_TM_CACHE]);

	if (rqi->dr_req)
		mempool_free(rqi->dr_req, snic->req_pool[SNIC_REQ_TM_CACHE]);

	mempool_free(rqi, snic->req_pool[rqi->rq_pool_type]);
}

void
snic_pci_unmap_rsp_buf(struct snic *snic, struct snic_req_info *rqi)
{
	struct snic_sg_desc *sgd;

	sgd = req_to_sgl(rqi_to_req(rqi));
	SNIC_BUG_ON(sgd[0].addr == 0);
	pci_unmap_single(snic->pdev,
			 le64_to_cpu(sgd[0].addr),
			 le32_to_cpu(sgd[0].len),
			 PCI_DMA_FROMDEVICE);
}

/*
 * snic_free_all_untagged_reqs: Walks through untagged reqs and frees them.
 */
void
snic_free_all_untagged_reqs(struct snic *snic)
{
	struct snic_req_info *rqi;
	struct list_head *cur, *nxt;
	unsigned long flags;

	spin_lock_irqsave(&snic->spl_cmd_lock, flags);
	list_for_each_safe(cur, nxt, &snic->spl_cmd_list) {
		rqi = list_entry(cur, struct snic_req_info, list);
		list_del_init(&rqi->list);
		if (rqi->sge_va) {
			snic_pci_unmap_rsp_buf(snic, rqi);
			kfree((void *)rqi->sge_va);
			rqi->sge_va = 0;
		}

		snic_req_free(snic, rqi);
	}
	spin_unlock_irqrestore(&snic->spl_cmd_lock, flags);
}

/*
 * snic_release_untagged_req : Unlinks the untagged req and frees it.
 */
void
snic_release_untagged_req(struct snic *snic, struct snic_req_info *rqi)
{
	unsigned long flags;

	spin_lock_irqsave(&snic->snic_lock, flags);
	if (snic->in_remove) {
		spin_unlock_irqrestore(&snic->snic_lock, flags);
		goto end;
	}
	spin_unlock_irqrestore(&snic->snic_lock, flags);

	spin_lock_irqsave(&snic->spl_cmd_lock, flags);
	if (list_empty(&rqi->list)) {
		spin_unlock_irqrestore(&snic->spl_cmd_lock, flags);
		goto end;
	}
	list_del_init(&rqi->list);
	spin_unlock_irqrestore(&snic->spl_cmd_lock, flags);
	snic_req_free(snic, rqi);

end:
	return;
}

/* dump buf in hex fmt */
void
snic_hex_dump(char *pfx, char *data, int len)
{
	SNIC_INFO("%s Dumping Data of Len = %d\n", pfx, len);
	print_hex_dump_bytes(pfx, DUMP_PREFIX_NONE, data, len);
}

#define	LINE_BUFSZ	128	/* for snic_print_desc fn */
static void
snic_dump_desc(const char *fn, char *os_buf, int len)
{
	struct snic_host_req *req = (struct snic_host_req *) os_buf;
	struct snic_fw_req *fwreq = (struct snic_fw_req *) os_buf;
	struct snic_req_info *rqi = NULL;
	char line[LINE_BUFSZ] = { '\0' };
	char *cmd_str = NULL;

	if (req->hdr.type >= SNIC_RSP_REPORT_TGTS_CMPL)
		rqi = (struct snic_req_info *) fwreq->hdr.init_ctx;
	else
		rqi = (struct snic_req_info *) req->hdr.init_ctx;

	SNIC_BUG_ON(rqi == NULL || rqi->req == NULL);
	switch (req->hdr.type) {
	case SNIC_REQ_REPORT_TGTS:
		cmd_str = "report-tgt : ";
		snprintf(line, LINE_BUFSZ, "SNIC_REQ_REPORT_TGTS :");
		break;

	case SNIC_REQ_ICMND:
		cmd_str = "icmnd : ";
		snprintf(line, LINE_BUFSZ, "SNIC_REQ_ICMND : 0x%x :",
			 req->u.icmnd.cdb[0]);
		break;

	case SNIC_REQ_ITMF:
		cmd_str = "itmf : ";
		snprintf(line, LINE_BUFSZ, "SNIC_REQ_ITMF :");
		break;

	case SNIC_REQ_HBA_RESET:
		cmd_str = "hba reset :";
		snprintf(line, LINE_BUFSZ, "SNIC_REQ_HBA_RESET :");
		break;

	case SNIC_REQ_EXCH_VER:
		cmd_str = "exch ver : ";
		snprintf(line, LINE_BUFSZ, "SNIC_REQ_EXCH_VER :");
		break;

	case SNIC_REQ_TGT_INFO:
		cmd_str = "tgt info : ";
		break;

	case SNIC_RSP_REPORT_TGTS_CMPL:
		cmd_str = "report tgt cmpl : ";
		snprintf(line, LINE_BUFSZ, "SNIC_RSP_REPORT_TGTS_CMPL :");
		break;

	case SNIC_RSP_ICMND_CMPL:
		cmd_str = "icmnd_cmpl : ";
		snprintf(line, LINE_BUFSZ, "SNIC_RSP_ICMND_CMPL : 0x%x :",
			 rqi->req->u.icmnd.cdb[0]);
		break;

	case SNIC_RSP_ITMF_CMPL:
		cmd_str = "itmf_cmpl : ";
		snprintf(line, LINE_BUFSZ, "SNIC_RSP_ITMF_CMPL :");
		break;

	case SNIC_RSP_HBA_RESET_CMPL:
		cmd_str = "hba_reset_cmpl : ";
		snprintf(line, LINE_BUFSZ, "SNIC_RSP_HBA_RESET_CMPL :");
		break;

	case SNIC_RSP_EXCH_VER_CMPL:
		cmd_str = "exch_ver_cmpl : ";
		snprintf(line, LINE_BUFSZ, "SNIC_RSP_EXCH_VER_CMPL :");
		break;

	case SNIC_MSG_ACK:
		cmd_str = "msg ack : ";
		snprintf(line, LINE_BUFSZ, "SNIC_MSG_ACK :");
		break;

	case SNIC_MSG_ASYNC_EVNOTIFY:
		cmd_str = "async notify : ";
		snprintf(line, LINE_BUFSZ, "SNIC_MSG_ASYNC_EVNOTIFY :");
		break;

	default:
		cmd_str = "unknown : ";
		SNIC_BUG_ON(1);
		break;
	}

	SNIC_INFO("%s:%s >>cmndid=%x:sg_cnt = %x:status = %x:ctx = %lx.\n",
		  fn, line, req->hdr.cmnd_id, req->hdr.sg_cnt, req->hdr.status,
		  req->hdr.init_ctx);

	/* Enable it, to dump byte stream */
	if (snic_log_level & 0x20)
		snic_hex_dump(cmd_str, os_buf, len);
} /* end of __snic_print_desc */

void
snic_print_desc(const char *fn, char *os_buf, int len)
{
	if (snic_log_level & SNIC_DESC_LOGGING)
		snic_dump_desc(fn, os_buf, len);
}

void
snic_calc_io_process_time(struct snic *snic, struct snic_req_info *rqi)
{
	u64 duration;

	duration = jiffies - rqi->start_time;

	if (duration > atomic64_read(&snic->s_stats.io.max_time))
		atomic64_set(&snic->s_stats.io.max_time, duration);
}
Commit	Line	Data
c8806b6c NM	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
	33	static void
	34	snic_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
	55	static int
	56	snic_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
79	int
80	snic_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
96	void
97	snic_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
126	end:
127	return;
128	}
129
130	/* Criteria to select work queue in multi queue mode */
131	static int
132	snic_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
140	int
141	snic_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	*/
186	void
187	snic_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	*/
202	struct snic_req_info *
203	snic_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
240	end:
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	*/
254	struct snic_host_req *
255	snic_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	*/
285	struct snic_host_req *
286	snic_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 */
310	void
311	snic_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
330	void
331	snic_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	*/
346	void
347	snic_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	*/
371	void
372	snic_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
392	end:
393	return;
394	}
395
396	/* dump buf in hex fmt */
397	void
398	snic_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 */
405	static void
406	snic_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
502	void
503	snic_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
509	void
510	snic_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	}