![Aya Mahfouz](/assets/img/avatar_default.png)
This patch is concerned with migrating the time variables for the s390 network drivers. The changes handle the y2038 problem where timespec will overflow in the year 2038. timespec was replaced by unsigned long and all time variables get their values from the jiffies global variable. This was done for the sake of speed and efficiency. Signed-off-by: Aya Mahfouz <mahfouz.saif.elyazal@gmail.com> Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
209 lines
5.1 KiB
C
209 lines
5.1 KiB
C
/*
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* Copyright IBM Corp. 2007, 2007
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* Authors: Peter Tiedemann (ptiedem@de.ibm.com)
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*
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*/
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#undef DEBUG
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#undef DEBUGDATA
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#undef DEBUGCCW
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#define KMSG_COMPONENT "ctcm"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/device.h>
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#include <linux/sysfs.h>
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#include <linux/slab.h>
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#include "ctcm_main.h"
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/*
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* sysfs attributes
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*/
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static ssize_t ctcm_buffer_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct ctcm_priv *priv = dev_get_drvdata(dev);
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if (!priv)
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return -ENODEV;
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return sprintf(buf, "%d\n", priv->buffer_size);
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}
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static ssize_t ctcm_buffer_write(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct net_device *ndev;
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unsigned int bs1;
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struct ctcm_priv *priv = dev_get_drvdata(dev);
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int rc;
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ndev = priv->channel[CTCM_READ]->netdev;
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if (!(priv && priv->channel[CTCM_READ] && ndev)) {
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CTCM_DBF_TEXT(SETUP, CTC_DBF_ERROR, "bfnondev");
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return -ENODEV;
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}
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rc = kstrtouint(buf, 0, &bs1);
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if (rc)
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goto einval;
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if (bs1 > CTCM_BUFSIZE_LIMIT)
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goto einval;
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if (bs1 < (576 + LL_HEADER_LENGTH + 2))
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goto einval;
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priv->buffer_size = bs1; /* just to overwrite the default */
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if ((ndev->flags & IFF_RUNNING) &&
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(bs1 < (ndev->mtu + LL_HEADER_LENGTH + 2)))
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goto einval;
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priv->channel[CTCM_READ]->max_bufsize = bs1;
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priv->channel[CTCM_WRITE]->max_bufsize = bs1;
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if (!(ndev->flags & IFF_RUNNING))
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ndev->mtu = bs1 - LL_HEADER_LENGTH - 2;
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priv->channel[CTCM_READ]->flags |= CHANNEL_FLAGS_BUFSIZE_CHANGED;
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priv->channel[CTCM_WRITE]->flags |= CHANNEL_FLAGS_BUFSIZE_CHANGED;
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CTCM_DBF_DEV(SETUP, ndev, buf);
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return count;
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einval:
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CTCM_DBF_DEV(SETUP, ndev, "buff_err");
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return -EINVAL;
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}
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static void ctcm_print_statistics(struct ctcm_priv *priv)
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{
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char *sbuf;
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char *p;
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if (!priv)
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return;
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sbuf = kmalloc(2048, GFP_KERNEL);
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if (sbuf == NULL)
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return;
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p = sbuf;
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p += sprintf(p, " Device FSM state: %s\n",
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fsm_getstate_str(priv->fsm));
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p += sprintf(p, " RX channel FSM state: %s\n",
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fsm_getstate_str(priv->channel[CTCM_READ]->fsm));
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p += sprintf(p, " TX channel FSM state: %s\n",
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fsm_getstate_str(priv->channel[CTCM_WRITE]->fsm));
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p += sprintf(p, " Max. TX buffer used: %ld\n",
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priv->channel[WRITE]->prof.maxmulti);
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p += sprintf(p, " Max. chained SKBs: %ld\n",
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priv->channel[WRITE]->prof.maxcqueue);
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p += sprintf(p, " TX single write ops: %ld\n",
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priv->channel[WRITE]->prof.doios_single);
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p += sprintf(p, " TX multi write ops: %ld\n",
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priv->channel[WRITE]->prof.doios_multi);
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p += sprintf(p, " Netto bytes written: %ld\n",
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priv->channel[WRITE]->prof.txlen);
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p += sprintf(p, " Max. TX IO-time: %u\n",
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jiffies_to_usecs(priv->channel[WRITE]->prof.tx_time));
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printk(KERN_INFO "Statistics for %s:\n%s",
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priv->channel[CTCM_WRITE]->netdev->name, sbuf);
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kfree(sbuf);
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return;
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}
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static ssize_t stats_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
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struct ctcm_priv *priv = dev_get_drvdata(dev);
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if (!priv || gdev->state != CCWGROUP_ONLINE)
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return -ENODEV;
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ctcm_print_statistics(priv);
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return sprintf(buf, "0\n");
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}
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static ssize_t stats_write(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct ctcm_priv *priv = dev_get_drvdata(dev);
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if (!priv)
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return -ENODEV;
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/* Reset statistics */
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memset(&priv->channel[WRITE]->prof, 0,
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sizeof(priv->channel[CTCM_WRITE]->prof));
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return count;
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}
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static ssize_t ctcm_proto_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct ctcm_priv *priv = dev_get_drvdata(dev);
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if (!priv)
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return -ENODEV;
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return sprintf(buf, "%d\n", priv->protocol);
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}
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static ssize_t ctcm_proto_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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int value, rc;
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struct ctcm_priv *priv = dev_get_drvdata(dev);
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if (!priv)
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return -ENODEV;
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rc = kstrtoint(buf, 0, &value);
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if (rc ||
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!((value == CTCM_PROTO_S390) ||
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(value == CTCM_PROTO_LINUX) ||
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(value == CTCM_PROTO_MPC) ||
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(value == CTCM_PROTO_OS390)))
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return -EINVAL;
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priv->protocol = value;
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CTCM_DBF_DEV(SETUP, dev, buf);
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return count;
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}
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static const char *ctcm_type[] = {
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"not a channel",
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"CTC/A",
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"FICON channel",
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"ESCON channel",
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"unknown channel type",
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"unsupported channel type",
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};
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static ssize_t ctcm_type_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct ccwgroup_device *cgdev;
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cgdev = to_ccwgroupdev(dev);
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if (!cgdev)
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return -ENODEV;
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return sprintf(buf, "%s\n",
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ctcm_type[cgdev->cdev[0]->id.driver_info]);
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}
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static DEVICE_ATTR(buffer, 0644, ctcm_buffer_show, ctcm_buffer_write);
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static DEVICE_ATTR(protocol, 0644, ctcm_proto_show, ctcm_proto_store);
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static DEVICE_ATTR(type, 0444, ctcm_type_show, NULL);
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static DEVICE_ATTR(stats, 0644, stats_show, stats_write);
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static struct attribute *ctcm_attr[] = {
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&dev_attr_protocol.attr,
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&dev_attr_type.attr,
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&dev_attr_buffer.attr,
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&dev_attr_stats.attr,
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NULL,
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};
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static struct attribute_group ctcm_attr_group = {
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.attrs = ctcm_attr,
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};
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const struct attribute_group *ctcm_attr_groups[] = {
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&ctcm_attr_group,
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NULL,
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};
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