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