drivers/s390/net/ctcm_sysfs.c

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