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 sprintf(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 += sprintf(p, "  Device FSM state: %s\n",
90 		     fsm_getstate_str(priv->fsm));
91 	p += sprintf(p, "  RX channel FSM state: %s\n",
92 		     fsm_getstate_str(priv->channel[CTCM_READ]->fsm));
93 	p += sprintf(p, "  TX channel FSM state: %s\n",
94 		     fsm_getstate_str(priv->channel[CTCM_WRITE]->fsm));
95 	p += sprintf(p, "  Max. TX buffer used: %ld\n",
96 		     priv->channel[WRITE]->prof.maxmulti);
97 	p += sprintf(p, "  Max. chained SKBs: %ld\n",
98 		     priv->channel[WRITE]->prof.maxcqueue);
99 	p += sprintf(p, "  TX single write ops: %ld\n",
100 		     priv->channel[WRITE]->prof.doios_single);
101 	p += sprintf(p, "  TX multi write ops: %ld\n",
102 		     priv->channel[WRITE]->prof.doios_multi);
103 	p += sprintf(p, "  Netto bytes written: %ld\n",
104 		     priv->channel[WRITE]->prof.txlen);
105 	p += sprintf(p, "  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 sprintf(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 sprintf(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 sprintf(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