ctcm: infrastructure for replaced ctc driver

ctcm driver supports the channel-to-channel connections of the
old ctc driver plus an additional MPC protocol to provide SNA
connectivity.

This new ctcm driver replaces the existing ctc driver.

Signed-off-by: Peter Tiedemann <ptiedem@de.ibm.com>
Signed-off-by: Ursula Braun <braunu@de.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 210 insertions, 0 deletions

diff --git a/drivers/s390/net/ctcm_sysfs.c b/drivers/s390/net/ctcm_sysfs.c
new file mode 100644
index 000000000000..bb2d13721d34
--- /dev/null
+++ b/drivers/s390/net/ctcm_sysfs.c
@@ -0,0 +1,210 @@
+/*
+ * drivers/s390/net/ctcm_sysfs.c
+ *
+ * Copyright IBM Corp. 2007, 2007
+ * Authors:	Peter Tiedemann (ptiedem@de.ibm.com)
+ *
+ */
+
+#undef DEBUG
+#undef DEBUGDATA
+#undef DEBUGCCW
+
+#include <linux/sysfs.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 sprintf(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;
+	int bs1;
+	struct ctcm_priv *priv = dev_get_drvdata(dev);
+
+	if (!(priv && priv->channel[READ] &&
+			(ndev = priv->channel[READ]->netdev))) {
+		CTCM_DBF_TEXT(SETUP, CTC_DBF_ERROR, "bfnondev");
+		return -ENODEV;
+	}
+
+	sscanf(buf, "%u", &bs1);
+	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[READ]->max_bufsize = bs1;
+	priv->channel[WRITE]->max_bufsize = bs1;
+	if (!(ndev->flags & IFF_RUNNING))
+		ndev->mtu = bs1 - LL_HEADER_LENGTH - 2;
+	priv->channel[READ]->flags |= CHANNEL_FLAGS_BUFSIZE_CHANGED;
+	priv->channel[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 += sprintf(p, "  Device FSM state: %s\n",
+		     fsm_getstate_str(priv->fsm));
+	p += sprintf(p, "  RX channel FSM state: %s\n",
+		     fsm_getstate_str(priv->channel[READ]->fsm));
+	p += sprintf(p, "  TX channel FSM state: %s\n",
+		     fsm_getstate_str(priv->channel[WRITE]->fsm));
+	p += sprintf(p, "  Max. TX buffer used: %ld\n",
+		     priv->channel[WRITE]->prof.maxmulti);
+	p += sprintf(p, "  Max. chained SKBs: %ld\n",
+		     priv->channel[WRITE]->prof.maxcqueue);
+	p += sprintf(p, "  TX single write ops: %ld\n",
+		     priv->channel[WRITE]->prof.doios_single);
+	p += sprintf(p, "  TX multi write ops: %ld\n",
+		     priv->channel[WRITE]->prof.doios_multi);
+	p += sprintf(p, "  Netto bytes written: %ld\n",
+		     priv->channel[WRITE]->prof.txlen);
+	p += sprintf(p, "  Max. TX IO-time: %ld\n",
+		     priv->channel[WRITE]->prof.tx_time);
+
+	printk(KERN_INFO "Statistics for %s:\n%s",
+				priv->channel[WRITE]->netdev->name, sbuf);
+	kfree(sbuf);
+	return;
+}
+
+static ssize_t stats_show(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct ctcm_priv *priv = dev_get_drvdata(dev);
+	if (!priv)
+		return -ENODEV;
+	ctcm_print_statistics(priv);
+	return sprintf(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[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 sprintf(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;
+	struct ctcm_priv *priv = dev_get_drvdata(dev);
+
+	if (!priv)
+		return -ENODEV;
+	sscanf(buf, "%u", &value);
+	if (!((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 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 sprintf(buf, "%s\n",
+			cu3088_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,
+	NULL,
+};
+
+static struct attribute_group ctcm_attr_group = {
+	.attrs = ctcm_attr,
+};
+
+int ctcm_add_attributes(struct device *dev)
+{
+	int rc;
+
+	rc = device_create_file(dev, &dev_attr_stats);
+
+	return rc;
+}
+
+void ctcm_remove_attributes(struct device *dev)
+{
+	device_remove_file(dev, &dev_attr_stats);
+}
+
+int ctcm_add_files(struct device *dev)
+{
+	return sysfs_create_group(&dev->kobj, &ctcm_attr_group);
+}
+
+void ctcm_remove_files(struct device *dev)
+{
+	sysfs_remove_group(&dev->kobj, &ctcm_attr_group);
+}
+