1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright IBM Corp. 2007, 2007
4 * Authors: Peter Tiedemann (ptiedem@de.ibm.com)
5 *
6 */
7
8 #undef DEBUG
9 #undef DEBUGDATA
10 #undef DEBUGCCW
11
12 #define KMSG_COMPONENT "ctcm"
13 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
14
15 #include <linux/device.h>
16 #include <linux/sysfs.h>
17 #include <linux/slab.h>
18 #include "ctcm_main.h"
19
20 /*
21 * sysfs attributes
22 */
23
ctcm_buffer_show(struct device * dev,struct device_attribute * attr,char * buf)24 static ssize_t ctcm_buffer_show(struct device *dev,
25 struct device_attribute *attr, char *buf)
26 {
27 struct ctcm_priv *priv = dev_get_drvdata(dev);
28
29 if (!priv)
30 return -ENODEV;
31 return sysfs_emit(buf, "%d\n", priv->buffer_size);
32 }
33
ctcm_buffer_write(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)34 static ssize_t ctcm_buffer_write(struct device *dev,
35 struct device_attribute *attr, const char *buf, size_t count)
36 {
37 struct net_device *ndev;
38 unsigned int bs1;
39 struct ctcm_priv *priv = dev_get_drvdata(dev);
40 int rc;
41
42 if (!(priv && priv->channel[CTCM_READ] &&
43 priv->channel[CTCM_READ]->netdev)) {
44 CTCM_DBF_TEXT(SETUP, CTC_DBF_ERROR, "bfnondev");
45 return -ENODEV;
46 }
47 ndev = priv->channel[CTCM_READ]->netdev;
48
49 rc = kstrtouint(buf, 0, &bs1);
50 if (rc)
51 goto einval;
52 if (bs1 > CTCM_BUFSIZE_LIMIT)
53 goto einval;
54 if (bs1 < (576 + LL_HEADER_LENGTH + 2))
55 goto einval;
56 priv->buffer_size = bs1; /* just to overwrite the default */
57
58 if ((ndev->flags & IFF_RUNNING) &&
59 (bs1 < (ndev->mtu + LL_HEADER_LENGTH + 2)))
60 goto einval;
61
62 priv->channel[CTCM_READ]->max_bufsize = bs1;
63 priv->channel[CTCM_WRITE]->max_bufsize = bs1;
64 if (!(ndev->flags & IFF_RUNNING))
65 ndev->mtu = bs1 - LL_HEADER_LENGTH - 2;
66 priv->channel[CTCM_READ]->flags |= CHANNEL_FLAGS_BUFSIZE_CHANGED;
67 priv->channel[CTCM_WRITE]->flags |= CHANNEL_FLAGS_BUFSIZE_CHANGED;
68
69 CTCM_DBF_DEV(SETUP, ndev, buf);
70 return count;
71
72 einval:
73 CTCM_DBF_DEV(SETUP, ndev, "buff_err");
74 return -EINVAL;
75 }
76
ctcm_print_statistics(struct ctcm_priv * priv)77 static void ctcm_print_statistics(struct ctcm_priv *priv)
78 {
79 char *sbuf;
80 char *p;
81
82 if (!priv)
83 return;
84 sbuf = kmalloc(2048, GFP_KERNEL);
85 if (sbuf == NULL)
86 return;
87 p = sbuf;
88
89 p += scnprintf(p, CTCM_STATSIZE_LIMIT, " Device FSM state: %s\n",
90 fsm_getstate_str(priv->fsm));
91 p += scnprintf(p, CTCM_STATSIZE_LIMIT, " RX channel FSM state: %s\n",
92 fsm_getstate_str(priv->channel[CTCM_READ]->fsm));
93 p += scnprintf(p, CTCM_STATSIZE_LIMIT, " TX channel FSM state: %s\n",
94 fsm_getstate_str(priv->channel[CTCM_WRITE]->fsm));
95 p += scnprintf(p, CTCM_STATSIZE_LIMIT, " Max. TX buffer used: %ld\n",
96 priv->channel[WRITE]->prof.maxmulti);
97 p += scnprintf(p, CTCM_STATSIZE_LIMIT, " Max. chained SKBs: %ld\n",
98 priv->channel[WRITE]->prof.maxcqueue);
99 p += scnprintf(p, CTCM_STATSIZE_LIMIT, " TX single write ops: %ld\n",
100 priv->channel[WRITE]->prof.doios_single);
101 p += scnprintf(p, CTCM_STATSIZE_LIMIT, " TX multi write ops: %ld\n",
102 priv->channel[WRITE]->prof.doios_multi);
103 p += scnprintf(p, CTCM_STATSIZE_LIMIT, " Netto bytes written: %ld\n",
104 priv->channel[WRITE]->prof.txlen);
105 p += scnprintf(p, CTCM_STATSIZE_LIMIT, " Max. TX IO-time: %u\n",
106 jiffies_to_usecs(priv->channel[WRITE]->prof.tx_time));
107
108 printk(KERN_INFO "Statistics for %s:\n%s",
109 priv->channel[CTCM_WRITE]->netdev->name, sbuf);
110 kfree(sbuf);
111 return;
112 }
113
stats_show(struct device * dev,struct device_attribute * attr,char * buf)114 static ssize_t stats_show(struct device *dev,
115 struct device_attribute *attr, char *buf)
116 {
117 struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
118 struct ctcm_priv *priv = dev_get_drvdata(dev);
119
120 if (!priv || gdev->state != CCWGROUP_ONLINE)
121 return -ENODEV;
122 ctcm_print_statistics(priv);
123 return sysfs_emit(buf, "0\n");
124 }
125
stats_write(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)126 static ssize_t stats_write(struct device *dev, struct device_attribute *attr,
127 const char *buf, size_t count)
128 {
129 struct ctcm_priv *priv = dev_get_drvdata(dev);
130 if (!priv)
131 return -ENODEV;
132 /* Reset statistics */
133 memset(&priv->channel[WRITE]->prof, 0,
134 sizeof(priv->channel[CTCM_WRITE]->prof));
135 return count;
136 }
137
ctcm_proto_show(struct device * dev,struct device_attribute * attr,char * buf)138 static ssize_t ctcm_proto_show(struct device *dev,
139 struct device_attribute *attr, char *buf)
140 {
141 struct ctcm_priv *priv = dev_get_drvdata(dev);
142 if (!priv)
143 return -ENODEV;
144
145 return sysfs_emit(buf, "%d\n", priv->protocol);
146 }
147
ctcm_proto_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)148 static ssize_t ctcm_proto_store(struct device *dev,
149 struct device_attribute *attr, const char *buf, size_t count)
150 {
151 int value, rc;
152 struct ctcm_priv *priv = dev_get_drvdata(dev);
153
154 if (!priv)
155 return -ENODEV;
156 rc = kstrtoint(buf, 0, &value);
157 if (rc ||
158 !((value == CTCM_PROTO_S390) ||
159 (value == CTCM_PROTO_LINUX) ||
160 (value == CTCM_PROTO_MPC) ||
161 (value == CTCM_PROTO_OS390)))
162 return -EINVAL;
163 priv->protocol = value;
164 CTCM_DBF_DEV(SETUP, dev, buf);
165
166 return count;
167 }
168
169 static const char *ctcm_type[] = {
170 "not a channel",
171 "CTC/A",
172 "FICON channel",
173 "ESCON channel",
174 "unknown channel type",
175 "unsupported channel type",
176 };
177
ctcm_type_show(struct device * dev,struct device_attribute * attr,char * buf)178 static ssize_t ctcm_type_show(struct device *dev,
179 struct device_attribute *attr, char *buf)
180 {
181 struct ccwgroup_device *cgdev;
182
183 cgdev = to_ccwgroupdev(dev);
184 if (!cgdev)
185 return -ENODEV;
186
187 return sysfs_emit(buf, "%s\n",
188 ctcm_type[cgdev->cdev[0]->id.driver_info]);
189 }
190
191 static DEVICE_ATTR(buffer, 0644, ctcm_buffer_show, ctcm_buffer_write);
192 static DEVICE_ATTR(protocol, 0644, ctcm_proto_show, ctcm_proto_store);
193 static DEVICE_ATTR(type, 0444, ctcm_type_show, NULL);
194 static DEVICE_ATTR(stats, 0644, stats_show, stats_write);
195
196 static struct attribute *ctcm_attr[] = {
197 &dev_attr_protocol.attr,
198 &dev_attr_type.attr,
199 &dev_attr_buffer.attr,
200 &dev_attr_stats.attr,
201 NULL,
202 };
203
204 static struct attribute_group ctcm_attr_group = {
205 .attrs = ctcm_attr,
206 };
207 const struct attribute_group *ctcm_attr_groups[] = {
208 &ctcm_attr_group,
209 NULL,
210 };
211