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xen-netback: Adding debugfs "io_ring_qX" files

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This patch adds debugfs capabilities to netback. There used to be a similar
patch floating around for classic kernel, but it used procfs. It is based on a
very similar blkback patch.
It creates xen-netback/[vifname]/io_ring_q[queueno] files, reading them output
various ring variables etc. Writing "kick" into it imitates an interrupt
happened, it can be useful to check whether the ring is just stalled due to a
missed interrupt.

Signed-off-by: Zoltan Kiss <zoltan.kiss@citrix.com>
Cc: netdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: xen-devel@lists.xenproject.org
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Zoltan Kiss
2014-07-08 19:49:14 +01:00
committed by David S. Miller
parent a37934fc0d
commit f51de24356
4 changed files with 200 additions and 2 deletions
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11
drivers/net/xen-netback/netback.c
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@@ -1987,6 +1987,13 @@ static int __init netback_init(void)
rx_drain_timeout_jiffies = msecs_to_jiffies(rx_drain_timeout_msecs);
#ifdef CONFIG_DEBUG_FS
xen_netback_dbg_root = debugfs_create_dir("xen-netback", NULL);
if (IS_ERR_OR_NULL(xen_netback_dbg_root))
pr_warn("Init of debugfs returned %ld!\n",
PTR_ERR(xen_netback_dbg_root));
#endif /* CONFIG_DEBUG_FS */
return 0;
failed_init:
@@ -1997,6 +2004,10 @@ module_init(netback_init);
static void __exit netback_fini(void)
{
#ifdef CONFIG_DEBUG_FS
if (!IS_ERR_OR_NULL(xen_netback_dbg_root))
debugfs_remove_recursive(xen_netback_dbg_root);
#endif /* CONFIG_DEBUG_FS */
xenvif_xenbus_fini();
}
module_exit(netback_fini);