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s390/qeth: add debugfs file for local IP addresses 

For debugging purposes, provide read access to the local_addr caches
via debug/qeth/<dev_name>/local_addrs.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Julian Wiedmann 2020-05-06 10:09:42 +02:00 committed by David S. Miller
parent 0d49c06bcf
commit fb8d258049
2 changed files with 33 additions and 1 deletions
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2
drivers/s390/net/qeth_core.h
View File

@ -11,6 +11,7 @@
#define __QETH_CORE_H__
#include <linux/completion.h>
#include <linux/debugfs.h>
#include <linux/if.h>
#include <linux/if_arp.h>
#include <linux/etherdevice.h>
@ -797,6 +798,7 @@ struct qeth_card {
struct qeth_channel data;
struct net_device *dev;
struct dentry *debugfs;
struct qeth_card_stats stats;
struct qeth_card_info info;
struct qeth_token token;

32
drivers/s390/net/qeth_core_main.c
View File

@ -61,6 +61,7 @@ EXPORT_SYMBOL_GPL(qeth_core_header_cache);
static struct kmem_cache *qeth_qdio_outbuf_cache;
static struct device *qeth_core_root_dev;
static struct dentry *qeth_debugfs_root;
static struct lock_class_key qdio_out_skb_queue_key;
static void qeth_issue_next_read_cb(struct qeth_card *card,
@ -805,6 +806,24 @@ static void qeth_del_local_addrs6(struct qeth_card *card,
spin_unlock(&card->local_addrs6_lock);
}
static int qeth_debugfs_local_addr_show(struct seq_file *m, void *v)
{
struct qeth_card *card = m->private;
struct qeth_local_addr *tmp;
unsigned int i;
rcu_read_lock();
hash_for_each_rcu(card->local_addrs4, i, tmp, hnode)
seq_printf(m, "%pI4\n", &tmp->addr.s6_addr32[3]);
hash_for_each_rcu(card->local_addrs6, i, tmp, hnode)
seq_printf(m, "%pI6c\n", &tmp->addr);
rcu_read_unlock();
return 0;
}
DEFINE_SHOW_ATTRIBUTE(qeth_debugfs_local_addr);
static void qeth_issue_ipa_msg(struct qeth_ipa_cmd *cmd, int rc,
struct qeth_card *card)
{
@ -1608,6 +1627,11 @@ static struct qeth_card *qeth_alloc_card(struct ccwgroup_device *gdev)
if (!card->read_cmd)
goto out_read_cmd;
card->debugfs = debugfs_create_dir(dev_name(&gdev->dev),
qeth_debugfs_root);
debugfs_create_file("local_addrs", 0400, card->debugfs, card,
&qeth_debugfs_local_addr_fops);
card->qeth_service_level.seq_print = qeth_core_sl_print;
register_service_level(&card->qeth_service_level);
return card;
@ -5085,9 +5109,11 @@ static int qeth_qdio_establish(struct qeth_card *card)
static void qeth_core_free_card(struct qeth_card *card)
{
QETH_CARD_TEXT(card, 2, "freecrd");
unregister_service_level(&card->qeth_service_level);
debugfs_remove_recursive(card->debugfs);
qeth_put_cmd(card->read_cmd);
destroy_workqueue(card->event_wq);
unregister_service_level(&card->qeth_service_level);
dev_set_drvdata(&card->gdev->dev, NULL);
kfree(card);
}
@ -6967,6 +6993,8 @@ static int __init qeth_core_init(void)
pr_info("loading core functions\n");
qeth_debugfs_root = debugfs_create_dir("qeth", NULL);
rc = qeth_register_dbf_views();
if (rc)
goto dbf_err;
@ -7008,6 +7036,7 @@ static int __init qeth_core_init(void)
register_err:
qeth_unregister_dbf_views();
dbf_err:
debugfs_remove_recursive(qeth_debugfs_root);
pr_err("Initializing the qeth device driver failed\n");
return rc;
}
@ -7021,6 +7050,7 @@ static void __exit qeth_core_exit(void)
kmem_cache_destroy(qeth_core_header_cache);
root_device_unregister(qeth_core_root_dev);
qeth_unregister_dbf_views();
debugfs_remove_recursive(qeth_debugfs_root);
pr_info("core functions removed\n");
}