Fixed MTP to work with TWRP

arch/s390/appldata/appldata_net_sum.c

@@ -0,0 +1,166 @@
+/*
+ * Data gathering module for Linux-VM Monitor Stream, Stage 1.
+ * Collects accumulated network statistics (Packets received/transmitted,
+ * dropped, errors, ...).
+ *
+ * Copyright IBM Corp. 2003, 2006
+ *
+ * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/kernel_stat.h>
+#include <linux/netdevice.h>
+#include <net/net_namespace.h>
+
+#include "appldata.h"
+
+
+/*
+ * Network data
+ *
+ * This is accessed as binary data by z/VM. If changes to it can't be avoided,
+ * the structure version (product ID, see appldata_base.c) needs to be changed
+ * as well and all documentation and z/VM applications using it must be updated.
+ *
+ * The record layout is documented in the Linux for zSeries Device Drivers
+ * book:
+ * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml
+ */
+struct appldata_net_sum_data {
+	u64 timestamp;
+	u32 sync_count_1;	/* after VM collected the record data, */
+	u32 sync_count_2;	/* sync_count_1 and sync_count_2 should be the
+				   same. If not, the record has been updated on
+				   the Linux side while VM was collecting the
+				   (possibly corrupt) data */
+
+	u32 nr_interfaces;	/* nr. of network interfaces being monitored */
+
+	u32 padding;		/* next value is 64-bit aligned, so these */
+				/* 4 byte would be padded out by compiler */
+
+	u64 rx_packets;		/* total packets received        */
+	u64 tx_packets;		/* total packets transmitted     */
+	u64 rx_bytes;		/* total bytes received          */
+	u64 tx_bytes;		/* total bytes transmitted       */
+	u64 rx_errors;		/* bad packets received          */
+	u64 tx_errors;		/* packet transmit problems      */
+	u64 rx_dropped;		/* no space in linux buffers     */
+	u64 tx_dropped;		/* no space available in linux   */
+	u64 collisions;		/* collisions while transmitting */
+} __packed;
+
+
+/*
+ * appldata_get_net_sum_data()
+ *
+ * gather accumulated network statistics
+ */
+static void appldata_get_net_sum_data(void *data)
+{
+	int i;
+	struct appldata_net_sum_data *net_data;
+	struct net_device *dev;
+	unsigned long rx_packets, tx_packets, rx_bytes, tx_bytes, rx_errors,
+			tx_errors, rx_dropped, tx_dropped, collisions;
+
+	net_data = data;
+	net_data->sync_count_1++;
+
+	i = 0;
+	rx_packets = 0;
+	tx_packets = 0;
+	rx_bytes   = 0;
+	tx_bytes   = 0;
+	rx_errors  = 0;
+	tx_errors  = 0;
+	rx_dropped = 0;
+	tx_dropped = 0;
+	collisions = 0;
+
+	rcu_read_lock();
+	for_each_netdev_rcu(&init_net, dev) {
+		const struct rtnl_link_stats64 *stats;
+		struct rtnl_link_stats64 temp;
+
+		stats = dev_get_stats(dev, &temp);
+		rx_packets += stats->rx_packets;
+		tx_packets += stats->tx_packets;
+		rx_bytes   += stats->rx_bytes;
+		tx_bytes   += stats->tx_bytes;
+		rx_errors  += stats->rx_errors;
+		tx_errors  += stats->tx_errors;
+		rx_dropped += stats->rx_dropped;
+		tx_dropped += stats->tx_dropped;
+		collisions += stats->collisions;
+		i++;
+	}
+	rcu_read_unlock();
+
+	net_data->nr_interfaces = i;
+	net_data->rx_packets = rx_packets;
+	net_data->tx_packets = tx_packets;
+	net_data->rx_bytes   = rx_bytes;
+	net_data->tx_bytes   = tx_bytes;
+	net_data->rx_errors  = rx_errors;
+	net_data->tx_errors  = tx_errors;
+	net_data->rx_dropped = rx_dropped;
+	net_data->tx_dropped = tx_dropped;
+	net_data->collisions = collisions;
+
+	net_data->timestamp = get_tod_clock();
+	net_data->sync_count_2++;
+}
+
+
+static struct appldata_ops ops = {
+	.name	   = "net_sum",
+	.record_nr = APPLDATA_RECORD_NET_SUM_ID,
+	.size	   = sizeof(struct appldata_net_sum_data),
+	.callback  = &appldata_get_net_sum_data,
+	.owner     = THIS_MODULE,
+	.mod_lvl   = {0xF0, 0xF0},		/* EBCDIC "00" */
+};
+
+
+/*
+ * appldata_net_init()
+ *
+ * init data, register ops
+ */
+static int __init appldata_net_init(void)
+{
+	int ret;
+
+	ops.data = kzalloc(sizeof(struct appldata_net_sum_data), GFP_KERNEL);
+	if (!ops.data)
+		return -ENOMEM;
+
+	ret = appldata_register_ops(&ops);
+	if (ret)
+		kfree(ops.data);
+
+	return ret;
+}
+
+/*
+ * appldata_net_exit()
+ *
+ * unregister ops
+ */
+static void __exit appldata_net_exit(void)
+{
+	appldata_unregister_ops(&ops);
+	kfree(ops.data);
+}
+
+
+module_init(appldata_net_init);
+module_exit(appldata_net_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Gerald Schaefer");
+MODULE_DESCRIPTION("Linux-VM Monitor Stream, accumulated network statistics");