drivers/s390/net/ctcm_sysfs.c

   1 /*
   2  * drivers/s390/net/ctcm_sysfs.c
   3  *
   4  * Copyright IBM Corp. 2007, 2007
   5  * Authors:     Peter Tiedemann (ptiedem@de.ibm.com)
   6  *
   7  */
   8
   9 #undef DEBUG
  10 #undef DEBUGDATA
  11 #undef DEBUGCCW
  12
  13 #define KMSG_COMPONENT "ctcm"
  14 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  15
  16 #include <linux/sysfs.h>
  17 #include <linux/slab.h>
  18 #include "ctcm_main.h"
  19
  20 /*
  21  * sysfs attributes
  22  */
  23
  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
  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         int bs1;
  39         struct ctcm_priv *priv = dev_get_drvdata(dev);
  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         sscanf(buf, "%u", &bs1);
  48         if (bs1 > CTCM_BUFSIZE_LIMIT)
  49                                         goto einval;
  50         if (bs1 < (576 + LL_HEADER_LENGTH + 2))
  51                                         goto einval;
  52         priv->buffer_size = bs1;        /* just to overwrite the default */
  53
  54         if ((ndev->flags & IFF_RUNNING) &&
  55             (bs1 < (ndev->mtu + LL_HEADER_LENGTH + 2)))
  56                                         goto einval;
  57
  58         priv->channel[CTCM_READ]->max_bufsize = bs1;
  59         priv->channel[CTCM_WRITE]->max_bufsize = bs1;
  60         if (!(ndev->flags & IFF_RUNNING))
  61                 ndev->mtu = bs1 - LL_HEADER_LENGTH - 2;
  62         priv->channel[CTCM_READ]->flags |= CHANNEL_FLAGS_BUFSIZE_CHANGED;
  63         priv->channel[CTCM_WRITE]->flags |= CHANNEL_FLAGS_BUFSIZE_CHANGED;
  64
  65         CTCM_DBF_DEV(SETUP, ndev, buf);
  66         return count;
  67
  68 einval:
  69         CTCM_DBF_DEV(SETUP, ndev, "buff_err");
  70         return -EINVAL;
  71 }
  72
  73 static void ctcm_print_statistics(struct ctcm_priv *priv)
  74 {
  75         char *sbuf;
  76         char *p;
  77
  78         if (!priv)
  79                 return;
  80         sbuf = kmalloc(2048, GFP_KERNEL);
  81         if (sbuf == NULL)
  82                 return;
  83         p = sbuf;
  84
  85         p += sprintf(p, "  Device FSM state: %s\n",
  86                      fsm_getstate_str(priv->fsm));
  87         p += sprintf(p, "  RX channel FSM state: %s\n",
  88                      fsm_getstate_str(priv->channel[CTCM_READ]->fsm));
  89         p += sprintf(p, "  TX channel FSM state: %s\n",
  90                      fsm_getstate_str(priv->channel[CTCM_WRITE]->fsm));
  91         p += sprintf(p, "  Max. TX buffer used: %ld\n",
  92                      priv->channel[WRITE]->prof.maxmulti);
  93         p += sprintf(p, "  Max. chained SKBs: %ld\n",
  94                      priv->channel[WRITE]->prof.maxcqueue);
  95         p += sprintf(p, "  TX single write ops: %ld\n",
  96                      priv->channel[WRITE]->prof.doios_single);
  97         p += sprintf(p, "  TX multi write ops: %ld\n",
  98                      priv->channel[WRITE]->prof.doios_multi);
  99         p += sprintf(p, "  Netto bytes written: %ld\n",
 100                      priv->channel[WRITE]->prof.txlen);
 101         p += sprintf(p, "  Max. TX IO-time: %ld\n",
 102                      priv->channel[WRITE]->prof.tx_time);
 103
 104         printk(KERN_INFO "Statistics for %s:\n%s",
 105                                 priv->channel[CTCM_WRITE]->netdev->name, sbuf);
 106         kfree(sbuf);
 107         return;
 108 }
 109
 110 static ssize_t stats_show(struct device *dev,
 111                                 struct device_attribute *attr, char *buf)
 112 {
 113         struct ctcm_priv *priv = dev_get_drvdata(dev);
 114         if (!priv)
 115                 return -ENODEV;
 116         ctcm_print_statistics(priv);
 117         return sprintf(buf, "0\n");
 118 }
 119
 120 static ssize_t stats_write(struct device *dev, struct device_attribute *attr,
 121                                 const char *buf, size_t count)
 122 {
 123         struct ctcm_priv *priv = dev_get_drvdata(dev);
 124         if (!priv)
 125                 return -ENODEV;
 126         /* Reset statistics */
 127         memset(&priv->channel[WRITE]->prof, 0,
 128                                 sizeof(priv->channel[CTCM_WRITE]->prof));
 129         return count;
 130 }
 131
 132 static ssize_t ctcm_proto_show(struct device *dev,
 133                                 struct device_attribute *attr, char *buf)
 134 {
 135         struct ctcm_priv *priv = dev_get_drvdata(dev);
 136         if (!priv)
 137                 return -ENODEV;
 138
 139         return sprintf(buf, "%d\n", priv->protocol);
 140 }
 141
 142 static ssize_t ctcm_proto_store(struct device *dev,
 143                 struct device_attribute *attr, const char *buf, size_t count)
 144 {
 145         int value;
 146         struct ctcm_priv *priv = dev_get_drvdata(dev);
 147
 148         if (!priv)
 149                 return -ENODEV;
 150         sscanf(buf, "%u", &value);
 151         if (!((value == CTCM_PROTO_S390)  ||
 152               (value == CTCM_PROTO_LINUX) ||
 153               (value == CTCM_PROTO_MPC) ||
 154               (value == CTCM_PROTO_OS390)))
 155                 return -EINVAL;
 156         priv->protocol = value;
 157         CTCM_DBF_DEV(SETUP, dev, buf);
 158
 159         return count;
 160 }
 161
 162 static const char *ctcm_type[] = {
 163         "not a channel",
 164         "CTC/A",
 165         "FICON channel",
 166         "ESCON channel",
 167         "unknown channel type",
 168         "unsupported channel type",
 169 };
 170
 171 static ssize_t ctcm_type_show(struct device *dev,
 172                                 struct device_attribute *attr, char *buf)
 173 {
 174         struct ccwgroup_device *cgdev;
 175
 176         cgdev = to_ccwgroupdev(dev);
 177         if (!cgdev)
 178                 return -ENODEV;
 179
 180         return sprintf(buf, "%s\n",
 181                         ctcm_type[cgdev->cdev[0]->id.driver_info]);
 182 }
 183
 184 static DEVICE_ATTR(buffer, 0644, ctcm_buffer_show, ctcm_buffer_write);
 185 static DEVICE_ATTR(protocol, 0644, ctcm_proto_show, ctcm_proto_store);
 186 static DEVICE_ATTR(type, 0444, ctcm_type_show, NULL);
 187 static DEVICE_ATTR(stats, 0644, stats_show, stats_write);
 188
 189 static struct attribute *ctcm_attr[] = {
 190         &dev_attr_protocol.attr,
 191         &dev_attr_type.attr,
 192         &dev_attr_buffer.attr,
 193         NULL,
 194 };
 195
 196 static struct attribute_group ctcm_attr_group = {
 197         .attrs = ctcm_attr,
 198 };
 199
 200 int ctcm_add_attributes(struct device *dev)
 201 {
 202         int rc;
 203
 204         rc = device_create_file(dev, &dev_attr_stats);
 205
 206         return rc;
 207 }
 208
 209 void ctcm_remove_attributes(struct device *dev)
 210 {
 211         device_remove_file(dev, &dev_attr_stats);
 212 }
 213
 214 int ctcm_add_files(struct device *dev)
 215 {
 216         return sysfs_create_group(&dev->kobj, &ctcm_attr_group);
 217 }
 218
 219 void ctcm_remove_files(struct device *dev)
 220 {
 221         sysfs_remove_group(&dev->kobj, &ctcm_attr_group);
 222 }
 223