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-rw-r--r--arch/s390/appldata/appldata_net_sum.c163
1 files changed, 163 insertions, 0 deletions
diff --git a/arch/s390/appldata/appldata_net_sum.c b/arch/s390/appldata/appldata_net_sum.c
new file mode 100644
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+++ b/arch/s390/appldata/appldata_net_sum.c
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+// SPDX-License-Identifier: GPL-2.0
+/*
+ * 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.
+ */
+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");