Quelle  ctcm_sysfs.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright IBM Corp. 2007, 2007
 * Authors: Peter Tiedemann (ptiedem@de.ibm.com)
 *
 */

#undef DEBUG
#undef DEBUGDATA
#undef DEBUGCCW

#define KMSG_COMPONENT "ctcm"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/device.h>
#include <linux/sysfs.h>
#include <linux/slab.h>
#include "ctcm_main.h"

/*
 * sysfs attributes
 */

static ssize_t ctcm_buffer_show(struct device *dev,
    struct device_attribute *attr, char *buf)
{
 struct ctcm_priv *priv = dev_get_drvdata(dev);

 if (!priv)
  return -ENODEV;
 return sysfs_emit(buf, "%d\n", priv->buffer_size);
}

static ssize_t ctcm_buffer_write(struct device *dev,
  struct device_attribute *attr, const char *buf, size_t count)
{
 struct net_device *ndev;
 unsigned int bs1;
 struct ctcm_priv *priv = dev_get_drvdata(dev);
 int rc;

 if (!(priv && priv->channel[CTCM_READ] &&
       priv->channel[CTCM_READ]->netdev)) {
  CTCM_DBF_TEXT(SETUP, CTC_DBF_ERROR, "bfnondev");
  return -ENODEV;
 }
 ndev = priv->channel[CTCM_READ]->netdev;

 rc = kstrtouint(buf, 0, &bs1);
 if (rc)
  goto einval;
 if (bs1 > CTCM_BUFSIZE_LIMIT)
     goto einval;
 if (bs1 < (576 + LL_HEADER_LENGTH + 2))
     goto einval;
 priv->buffer_size = bs1; /* just to overwrite the default */

 if ((ndev->flags & IFF_RUNNING) &&
     (bs1 < (ndev->mtu + LL_HEADER_LENGTH + 2)))
     goto einval;

 priv->channel[CTCM_READ]->max_bufsize = bs1;
 priv->channel[CTCM_WRITE]->max_bufsize = bs1;
 if (!(ndev->flags & IFF_RUNNING))
  ndev->mtu = bs1 - LL_HEADER_LENGTH - 2;
 priv->channel[CTCM_READ]->flags |= CHANNEL_FLAGS_BUFSIZE_CHANGED;
 priv->channel[CTCM_WRITE]->flags |= CHANNEL_FLAGS_BUFSIZE_CHANGED;

 CTCM_DBF_DEV(SETUP, ndev, buf);
 return count;

einval:
 CTCM_DBF_DEV(SETUP, ndev, "buff_err");
 return -EINVAL;
}

static void ctcm_print_statistics(struct ctcm_priv *priv)
{
 char *sbuf;
 char *p;

 if (!priv)
  return;
 sbuf = kmalloc(2048, GFP_KERNEL);
 if (sbuf == NULL)
  return;
 p = sbuf;

 p += scnprintf(p, CTCM_STATSIZE_LIMIT, " Device FSM state: %s\n",
         fsm_getstate_str(priv->fsm));
 p += scnprintf(p, CTCM_STATSIZE_LIMIT, " RX channel FSM state: %s\n",
         fsm_getstate_str(priv->channel[CTCM_READ]->fsm));
 p += scnprintf(p, CTCM_STATSIZE_LIMIT, " TX channel FSM state: %s\n",
         fsm_getstate_str(priv->channel[CTCM_WRITE]->fsm));
 p += scnprintf(p, CTCM_STATSIZE_LIMIT, " Max. TX buffer used: %ld\n",
         priv->channel[WRITE]->prof.maxmulti);
 p += scnprintf(p, CTCM_STATSIZE_LIMIT, " Max. chained SKBs: %ld\n",
         priv->channel[WRITE]->prof.maxcqueue);
 p += scnprintf(p, CTCM_STATSIZE_LIMIT, " TX single write ops: %ld\n",
         priv->channel[WRITE]->prof.doios_single);
 p += scnprintf(p, CTCM_STATSIZE_LIMIT, " TX multi write ops: %ld\n",
         priv->channel[WRITE]->prof.doios_multi);
 p += scnprintf(p, CTCM_STATSIZE_LIMIT, " Netto bytes written: %ld\n",
         priv->channel[WRITE]->prof.txlen);
 p += scnprintf(p, CTCM_STATSIZE_LIMIT, " Max. TX IO-time: %u\n",
         jiffies_to_usecs(priv->channel[WRITE]->prof.tx_time));

 printk(KERN_INFO "Statistics for %s:\n%s",
    priv->channel[CTCM_WRITE]->netdev->name, sbuf);
 kfree(sbuf);
 return;
}

static ssize_t stats_show(struct device *dev,
     struct device_attribute *attr, char *buf)
{
 struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
 struct ctcm_priv *priv = dev_get_drvdata(dev);

 if (!priv || gdev->state != CCWGROUP_ONLINE)
  return -ENODEV;
 ctcm_print_statistics(priv);
 return sysfs_emit(buf, "0\n");
}

static ssize_t stats_write(struct device *dev, struct device_attribute *attr,
    const char *buf, size_t count)
{
 struct ctcm_priv *priv = dev_get_drvdata(dev);
 if (!priv)
  return -ENODEV;
 /* Reset statistics */
 memset(&priv->channel[WRITE]->prof, 0,
    sizeof(priv->channel[CTCM_WRITE]->prof));
 return count;
}

static ssize_t ctcm_proto_show(struct device *dev,
    struct device_attribute *attr, char *buf)
{
 struct ctcm_priv *priv = dev_get_drvdata(dev);
 if (!priv)
  return -ENODEV;

 return sysfs_emit(buf, "%d\n", priv->protocol);
}

static ssize_t ctcm_proto_store(struct device *dev,
  struct device_attribute *attr, const char *buf, size_t count)
{
 int value, rc;
 struct ctcm_priv *priv = dev_get_drvdata(dev);

 if (!priv)
  return -ENODEV;
 rc = kstrtoint(buf, 0, &value);
 if (rc ||
     !((value == CTCM_PROTO_S390)  ||
       (value == CTCM_PROTO_LINUX) ||
       (value == CTCM_PROTO_MPC) ||
       (value == CTCM_PROTO_OS390)))
  return -EINVAL;
 priv->protocol = value;
 CTCM_DBF_DEV(SETUP, dev, buf);

 return count;
}

static const char *ctcm_type[] = {
 "not a channel",
 "CTC/A",
 "FICON channel",
 "ESCON channel",
 "unknown channel type",
 "unsupported channel type",
};

static ssize_t ctcm_type_show(struct device *dev,
    struct device_attribute *attr, char *buf)
{
 struct ccwgroup_device *cgdev;

 cgdev = to_ccwgroupdev(dev);
 if (!cgdev)
  return -ENODEV;

 return sysfs_emit(buf, "%s\n",
     ctcm_type[cgdev->cdev[0]->id.driver_info]);
}

static DEVICE_ATTR(buffer, 0644, ctcm_buffer_show, ctcm_buffer_write);
static DEVICE_ATTR(protocol, 0644, ctcm_proto_show, ctcm_proto_store);
static DEVICE_ATTR(type, 0444, ctcm_type_show, NULL);
static DEVICE_ATTR(stats, 0644, stats_show, stats_write);

static struct attribute *ctcm_attr[] = {
 &dev_attr_protocol.attr,
 &dev_attr_type.attr,
 &dev_attr_buffer.attr,
 &dev_attr_stats.attr,
 NULL,
};

static struct attribute_group ctcm_attr_group = {
 .attrs = ctcm_attr,
};
const struct attribute_group *ctcm_attr_groups[] = {
 &ctcm_attr_group,
 NULL,
};