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 */
23 void
snic_handle_link(struct work_struct * work)24 snic_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 */
44 static int
snic_ver_enc(const char * s)45 snic_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
75 end:
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 */
91 int
snic_queue_exch_ver_req(struct snic * snic)92 snic_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
130 error:
131 return ret;
132 } /* end of snic_queue_exch_ver_req */
133
134 /*
135 * snic_io_exch_ver_cmpl_handler
136 */
137 void
snic_io_exch_ver_cmpl_handler(struct snic * snic,struct snic_fw_req * fwreq)138 snic_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
205 exch_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 */
216 int
snic_get_conf(struct snic * snic)217 snic_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 */
258