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 #include <linux/ctype.h>
28
29 #include "snic_io.h"
30 #include "snic.h"
31 #include "cq_enet_desc.h"
32 #include "snic_fwint.h"
33
34 /*
35 * snic_handle_link : Handles link flaps.
36 */
37 void
snic_handle_link(struct work_struct * work)38 snic_handle_link(struct work_struct *work)
39 {
40 struct snic *snic = container_of(work, struct snic, link_work);
41
42 if (snic->config.xpt_type == SNIC_DAS)
43 return;
44
45 snic->link_status = svnic_dev_link_status(snic->vdev);
46 snic->link_down_cnt = svnic_dev_link_down_cnt(snic->vdev);
47 SNIC_HOST_INFO(snic->shost, "Link Event: Link %s.\n",
48 ((snic->link_status) ? "Up" : "Down"));
49
50 SNIC_ASSERT_NOT_IMPL(1);
51 }
52
53
54 /*
55 * snic_ver_enc : Encodes version str to int
56 * version string is similar to netmask string
57 */
58 static int
snic_ver_enc(const char * s)59 snic_ver_enc(const char *s)
60 {
61 int v[4] = {0};
62 int i = 0, x = 0;
63 char c;
64 const char *p = s;
65
66 /* validate version string */
67 if ((strlen(s) > 15) || (strlen(s) < 7))
68 goto end;
69
70 while ((c = *p++)) {
71 if (c == '.') {
72 i++;
73 continue;
74 }
75
76 if (i > 3 || !isdigit(c))
77 goto end;
78
79 v[i] = v[i] * 10 + (c - '0');
80 }
81
82 /* validate sub version numbers */
83 for (i = 3; i >= 0; i--)
84 if (v[i] > 0xff)
85 goto end;
86
87 x |= (v[0] << 24) | v[1] << 16 | v[2] << 8 | v[3];
88
89 end:
90 if (x == 0) {
91 SNIC_ERR("Invalid version string [%s].\n", s);
92
93 return -1;
94 }
95
96 return x;
97 } /* end of snic_ver_enc */
98
99 /*
100 * snic_qeueue_exch_ver_req :
101 *
102 * Queues Exchange Version Request, to communicate host information
103 * in return, it gets firmware version details
104 */
105 int
snic_queue_exch_ver_req(struct snic * snic)106 snic_queue_exch_ver_req(struct snic *snic)
107 {
108 struct snic_req_info *rqi = NULL;
109 struct snic_host_req *req = NULL;
110 u32 ver = 0;
111 int ret = 0;
112
113 SNIC_HOST_INFO(snic->shost, "Exch Ver Req Preparing...\n");
114
115 rqi = snic_req_init(snic, 0);
116 if (!rqi) {
117 SNIC_HOST_ERR(snic->shost, "Init Exch Ver Req failed\n");
118 ret = -ENOMEM;
119 goto error;
120 }
121
122 req = rqi_to_req(rqi);
123
124 /* Initialize snic_host_req */
125 snic_io_hdr_enc(&req->hdr, SNIC_REQ_EXCH_VER, 0, SCSI_NO_TAG,
126 snic->config.hid, 0, (ulong)rqi);
127 ver = snic_ver_enc(SNIC_DRV_VERSION);
128 req->u.exch_ver.drvr_ver = cpu_to_le32(ver);
129 req->u.exch_ver.os_type = cpu_to_le32(SNIC_OS_LINUX);
130
131 snic_handle_untagged_req(snic, rqi);
132
133 ret = snic_queue_wq_desc(snic, req, sizeof(*req));
134 if (ret) {
135 snic_release_untagged_req(snic, rqi);
136 SNIC_HOST_ERR(snic->shost,
137 "Queuing Exch Ver Req failed, err = %d\n",
138 ret);
139 goto error;
140 }
141
142 SNIC_HOST_INFO(snic->shost, "Exch Ver Req is issued. ret = %d\n", ret);
143
144 error:
145 return ret;
146 } /* end of snic_queue_exch_ver_req */
147
148 /*
149 * snic_io_exch_ver_cmpl_handler
150 */
151 void
snic_io_exch_ver_cmpl_handler(struct snic * snic,struct snic_fw_req * fwreq)152 snic_io_exch_ver_cmpl_handler(struct snic *snic, struct snic_fw_req *fwreq)
153 {
154 struct snic_req_info *rqi = NULL;
155 struct snic_exch_ver_rsp *exv_cmpl = &fwreq->u.exch_ver_cmpl;
156 u8 typ, hdr_stat;
157 u32 cmnd_id, hid, max_sgs;
158 ulong ctx = 0;
159 unsigned long flags;
160
161 SNIC_HOST_INFO(snic->shost, "Exch Ver Compl Received.\n");
162 snic_io_hdr_dec(&fwreq->hdr, &typ, &hdr_stat, &cmnd_id, &hid, &ctx);
163 SNIC_BUG_ON(snic->config.hid != hid);
164 rqi = (struct snic_req_info *) ctx;
165
166 if (hdr_stat) {
167 SNIC_HOST_ERR(snic->shost,
168 "Exch Ver Completed w/ err status %d\n",
169 hdr_stat);
170
171 goto exch_cmpl_end;
172 }
173
174 spin_lock_irqsave(&snic->snic_lock, flags);
175 snic->fwinfo.fw_ver = le32_to_cpu(exv_cmpl->version);
176 snic->fwinfo.hid = le32_to_cpu(exv_cmpl->hid);
177 snic->fwinfo.max_concur_ios = le32_to_cpu(exv_cmpl->max_concur_ios);
178 snic->fwinfo.max_sgs_per_cmd = le32_to_cpu(exv_cmpl->max_sgs_per_cmd);
179 snic->fwinfo.max_io_sz = le32_to_cpu(exv_cmpl->max_io_sz);
180 snic->fwinfo.max_tgts = le32_to_cpu(exv_cmpl->max_tgts);
181 snic->fwinfo.io_tmo = le16_to_cpu(exv_cmpl->io_timeout);
182
183 SNIC_HOST_INFO(snic->shost,
184 "vers %u hid %u max_concur_ios %u max_sgs_per_cmd %u max_io_sz %u max_tgts %u fw tmo %u\n",
185 snic->fwinfo.fw_ver,
186 snic->fwinfo.hid,
187 snic->fwinfo.max_concur_ios,
188 snic->fwinfo.max_sgs_per_cmd,
189 snic->fwinfo.max_io_sz,
190 snic->fwinfo.max_tgts,
191 snic->fwinfo.io_tmo);
192
193 SNIC_HOST_INFO(snic->shost,
194 "HBA Capabilities = 0x%x\n",
195 le32_to_cpu(exv_cmpl->hba_cap));
196
197 /* Updating SGList size */
198 max_sgs = snic->fwinfo.max_sgs_per_cmd;
199 if (max_sgs && max_sgs < SNIC_MAX_SG_DESC_CNT) {
200 snic->shost->sg_tablesize = max_sgs;
201 SNIC_HOST_INFO(snic->shost, "Max SGs set to %d\n",
202 snic->shost->sg_tablesize);
203 } else if (max_sgs > snic->shost->sg_tablesize) {
204 SNIC_HOST_INFO(snic->shost,
205 "Target type %d Supports Larger Max SGList %d than driver's Max SG List %d.\n",
206 snic->config.xpt_type, max_sgs,
207 snic->shost->sg_tablesize);
208 }
209
210 if (snic->shost->can_queue > snic->fwinfo.max_concur_ios)
211 snic->shost->can_queue = snic->fwinfo.max_concur_ios;
212
213 snic->shost->max_sectors = snic->fwinfo.max_io_sz >> 9;
214 if (snic->fwinfo.wait)
215 complete(snic->fwinfo.wait);
216
217 spin_unlock_irqrestore(&snic->snic_lock, flags);
218
219 exch_cmpl_end:
220 snic_release_untagged_req(snic, rqi);
221
222 SNIC_HOST_INFO(snic->shost, "Exch_cmpl Done, hdr_stat %d.\n", hdr_stat);
223 } /* end of snic_io_exch_ver_cmpl_handler */
224
225 /*
226 * snic_get_conf
227 *
228 * Synchronous call, and Retrieves snic params.
229 */
230 int
snic_get_conf(struct snic * snic)231 snic_get_conf(struct snic *snic)
232 {
233 DECLARE_COMPLETION_ONSTACK(wait);
234 unsigned long flags;
235 int ret;
236 int nr_retries = 3;
237
238 SNIC_HOST_INFO(snic->shost, "Retrieving snic params.\n");
239 spin_lock_irqsave(&snic->snic_lock, flags);
240 memset(&snic->fwinfo, 0, sizeof(snic->fwinfo));
241 snic->fwinfo.wait = &wait;
242 spin_unlock_irqrestore(&snic->snic_lock, flags);
243
244 /* Additional delay to handle HW Resource initialization. */
245 msleep(50);
246
247 /*
248 * Exch ver req can be ignored by FW, if HW Resource initialization
249 * is in progress, Hence retry.
250 */
251 do {
252 ret = snic_queue_exch_ver_req(snic);
253 if (ret)
254 return ret;
255
256 wait_for_completion_timeout(&wait, msecs_to_jiffies(2000));
257 spin_lock_irqsave(&snic->snic_lock, flags);
258 ret = (snic->fwinfo.fw_ver != 0) ? 0 : -ETIMEDOUT;
259 if (ret)
260 SNIC_HOST_ERR(snic->shost,
261 "Failed to retrieve snic params,\n");
262
263 /* Unset fwinfo.wait, on success or on last retry */
264 if (ret == 0 || nr_retries == 1)
265 snic->fwinfo.wait = NULL;
266
267 spin_unlock_irqrestore(&snic->snic_lock, flags);
268 } while (ret && --nr_retries);
269
270 return ret;
271 } /* end of snic_get_info */
272