snic_ctl.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2// Copyright 2014 Cisco Systems, Inc.  All rights reserved.
  3
  4#include <linux/errno.h>
  5#include <linux/pci.h>
  6#include <linux/slab.h>
  7
  8#include <linux/interrupt.h>
  9#include <linux/workqueue.h>
 10#include <linux/spinlock.h>
 11#include <linux/mempool.h>
 12#include <scsi/scsi_tcq.h>
 13#include <linux/ctype.h>
 14
 15#include "snic_io.h"
 16#include "snic.h"
 17#include "cq_enet_desc.h"
 18#include "snic_fwint.h"
 19
 20/*
 21 * snic_handle_link : Handles link flaps.
 22 */
 23void
 24snic_handle_link(struct work_struct *work)
 25{
 26	struct snic *snic = container_of(work, struct snic, link_work);
 27
 28	if (snic->config.xpt_type == SNIC_DAS)
 29		return;
 30
 31	snic->link_status = svnic_dev_link_status(snic->vdev);
 32	snic->link_down_cnt = svnic_dev_link_down_cnt(snic->vdev);
 33	SNIC_HOST_INFO(snic->shost, "Link Event: Link %s.\n",
 34		       ((snic->link_status) ? "Up" : "Down"));
 35
 36	SNIC_ASSERT_NOT_IMPL(1);
 37}
 38
 39
 40/*
 41 * snic_ver_enc : Encodes version str to int
 42 * version string is similar to netmask string
 43 */
 44static int
 45snic_ver_enc(const char *s)
 46{
 47	int v[4] = {0};
 48	int  i = 0, x = 0;
 49	char c;
 50	const char *p = s;
 51
 52	/* validate version string */
 53	if ((strlen(s) > 15) || (strlen(s) < 7))
 54		goto end;
 55
 56	while ((c = *p++)) {
 57		if (c == '.') {
 58			i++;
 59			continue;
 60		}
 61
 62		if (i > 3 || !isdigit(c))
 63			goto end;
 64
 65		v[i] = v[i] * 10 + (c - '0');
 66	}
 67
 68	/* validate sub version numbers */
 69	for (i = 3; i >= 0; i--)
 70		if (v[i] > 0xff)
 71			goto end;
 72
 73	x |= (v[0] << 24) | v[1] << 16 | v[2] << 8 | v[3];
 74
 75end:
 76	if (x == 0) {
 77		SNIC_ERR("Invalid version string [%s].\n", s);
 78
 79		return -1;
 80	}
 81
 82	return x;
 83} /* end of snic_ver_enc */
 84
 85/*
 86 * snic_qeueue_exch_ver_req :
 87 *
 88 * Queues Exchange Version Request, to communicate host information
 89 * in return, it gets firmware version details
 90 */
 91int
 92snic_queue_exch_ver_req(struct snic *snic)
 93{
 94	struct snic_req_info *rqi = NULL;
 95	struct snic_host_req *req = NULL;
 96	u32 ver = 0;
 97	int ret = 0;
 98
 99	SNIC_HOST_INFO(snic->shost, "Exch Ver Req Preparing...\n");
100
101	rqi = snic_req_init(snic, 0);
102	if (!rqi) {
103		SNIC_HOST_ERR(snic->shost, "Init Exch Ver Req failed\n");
104		ret = -ENOMEM;
105		goto error;
106	}
107
108	req = rqi_to_req(rqi);
109
110	/* Initialize snic_host_req */
111	snic_io_hdr_enc(&req->hdr, SNIC_REQ_EXCH_VER, 0, SCSI_NO_TAG,
112			snic->config.hid, 0, (ulong)rqi);
113	ver = snic_ver_enc(SNIC_DRV_VERSION);
114	req->u.exch_ver.drvr_ver = cpu_to_le32(ver);
115	req->u.exch_ver.os_type = cpu_to_le32(SNIC_OS_LINUX);
116
117	snic_handle_untagged_req(snic, rqi);
118
119	ret = snic_queue_wq_desc(snic, req, sizeof(*req));
120	if (ret) {
121		snic_release_untagged_req(snic, rqi);
122		SNIC_HOST_ERR(snic->shost,
123			      "Queuing Exch Ver Req failed, err = %d\n",
124			      ret);
125		goto error;
126	}
127
128	SNIC_HOST_INFO(snic->shost, "Exch Ver Req is issued. ret = %d\n", ret);
129
130error:
131	return ret;
132} /* end of snic_queue_exch_ver_req */
133
134/*
135 * snic_io_exch_ver_cmpl_handler
136 */
137void
138snic_io_exch_ver_cmpl_handler(struct snic *snic, struct snic_fw_req *fwreq)
139{
140	struct snic_req_info *rqi = NULL;
141	struct snic_exch_ver_rsp *exv_cmpl = &fwreq->u.exch_ver_cmpl;
142	u8 typ, hdr_stat;
143	u32 cmnd_id, hid, max_sgs;
144	ulong ctx = 0;
145	unsigned long flags;
146
147	SNIC_HOST_INFO(snic->shost, "Exch Ver Compl Received.\n");
148	snic_io_hdr_dec(&fwreq->hdr, &typ, &hdr_stat, &cmnd_id, &hid, &ctx);
149	SNIC_BUG_ON(snic->config.hid != hid);
150	rqi = (struct snic_req_info *) ctx;
151
152	if (hdr_stat) {
153		SNIC_HOST_ERR(snic->shost,
154			      "Exch Ver Completed w/ err status %d\n",
155			      hdr_stat);
156
157		goto exch_cmpl_end;
158	}
159
160	spin_lock_irqsave(&snic->snic_lock, flags);
161	snic->fwinfo.fw_ver = le32_to_cpu(exv_cmpl->version);
162	snic->fwinfo.hid = le32_to_cpu(exv_cmpl->hid);
163	snic->fwinfo.max_concur_ios = le32_to_cpu(exv_cmpl->max_concur_ios);
164	snic->fwinfo.max_sgs_per_cmd = le32_to_cpu(exv_cmpl->max_sgs_per_cmd);
165	snic->fwinfo.max_io_sz = le32_to_cpu(exv_cmpl->max_io_sz);
166	snic->fwinfo.max_tgts = le32_to_cpu(exv_cmpl->max_tgts);
167	snic->fwinfo.io_tmo = le16_to_cpu(exv_cmpl->io_timeout);
168
169	SNIC_HOST_INFO(snic->shost,
170		       "vers %u hid %u max_concur_ios %u max_sgs_per_cmd %u max_io_sz %u max_tgts %u fw tmo %u\n",
171		       snic->fwinfo.fw_ver,
172		       snic->fwinfo.hid,
173		       snic->fwinfo.max_concur_ios,
174		       snic->fwinfo.max_sgs_per_cmd,
175		       snic->fwinfo.max_io_sz,
176		       snic->fwinfo.max_tgts,
177		       snic->fwinfo.io_tmo);
178
179	SNIC_HOST_INFO(snic->shost,
180		       "HBA Capabilities = 0x%x\n",
181		       le32_to_cpu(exv_cmpl->hba_cap));
182
183	/* Updating SGList size */
184	max_sgs = snic->fwinfo.max_sgs_per_cmd;
185	if (max_sgs && max_sgs < SNIC_MAX_SG_DESC_CNT) {
186		snic->shost->sg_tablesize = max_sgs;
187		SNIC_HOST_INFO(snic->shost, "Max SGs set to %d\n",
188			       snic->shost->sg_tablesize);
189	} else if (max_sgs > snic->shost->sg_tablesize) {
190		SNIC_HOST_INFO(snic->shost,
191			       "Target type %d Supports Larger Max SGList %d than driver's Max SG List %d.\n",
192			       snic->config.xpt_type, max_sgs,
193			       snic->shost->sg_tablesize);
194	}
195
196	if (snic->shost->can_queue > snic->fwinfo.max_concur_ios)
197		snic->shost->can_queue = snic->fwinfo.max_concur_ios;
198
199	snic->shost->max_sectors = snic->fwinfo.max_io_sz >> 9;
200	if (snic->fwinfo.wait)
201		complete(snic->fwinfo.wait);
202
203	spin_unlock_irqrestore(&snic->snic_lock, flags);
204
205exch_cmpl_end:
206	snic_release_untagged_req(snic, rqi);
207
208	SNIC_HOST_INFO(snic->shost, "Exch_cmpl Done, hdr_stat %d.\n", hdr_stat);
209} /* end of snic_io_exch_ver_cmpl_handler */
210
211/*
212 * snic_get_conf
213 *
214 * Synchronous call, and Retrieves snic params.
215 */
216int
217snic_get_conf(struct snic *snic)
218{
219	DECLARE_COMPLETION_ONSTACK(wait);
220	unsigned long flags;
221	int ret;
222	int nr_retries = 3;
223
224	SNIC_HOST_INFO(snic->shost, "Retrieving snic params.\n");
225	spin_lock_irqsave(&snic->snic_lock, flags);
226	memset(&snic->fwinfo, 0, sizeof(snic->fwinfo));
227	snic->fwinfo.wait = &wait;
228	spin_unlock_irqrestore(&snic->snic_lock, flags);
229
230	/* Additional delay to handle HW Resource initialization. */
231	msleep(50);
232
233	/*
234	 * Exch ver req can be ignored by FW, if HW Resource initialization
235	 * is in progress, Hence retry.
236	 */
237	do {
238		ret = snic_queue_exch_ver_req(snic);
239		if (ret)
240			return ret;
241
242		wait_for_completion_timeout(&wait, msecs_to_jiffies(2000));
243		spin_lock_irqsave(&snic->snic_lock, flags);
244		ret = (snic->fwinfo.fw_ver != 0) ? 0 : -ETIMEDOUT;
245		if (ret)
246			SNIC_HOST_ERR(snic->shost,
247				      "Failed to retrieve snic params,\n");
248
249		/* Unset fwinfo.wait, on success or on last retry */
250		if (ret == 0 || nr_retries == 1)
251			snic->fwinfo.wait = NULL;
252
253		spin_unlock_irqrestore(&snic->snic_lock, flags);
254	} while (ret && --nr_retries);
255
256	return ret;
257} /* end of snic_get_info */