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