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| author |   Zoltan Kiss <zoltan.kiss@citrix.com> | 2014-07-08 19:49:14 +0100 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2014-07-08 20:48:36 -0700 |
| commit | f51de24356e49e4dcb5095e87717065580912120 (patch) | |
| tree | 33439ff1f49a3d2d61455f0c6585b3369088b25c /drivers/net/xen-netback/netback.c | |
| parent | net: provide stubs for ip6_set_txhash and ip6_make_flowlabel (diff) | |
| download | linux-dev-f51de24356e49e4dcb5095e87717065580912120.tar.xz linux-dev-f51de24356e49e4dcb5095e87717065580912120.zip | |
xen-netback: Adding debugfs "io_ring_qX" files
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>
Diffstat (limited to '')
| -rw-r--r-- | drivers/net/xen-netback/netback.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c index 1844a47636b6..77127ca08ca4 100644 --- a/drivers/net/xen-netback/netback.c +++ b/drivers/net/xen-netback/netback.c @@ -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); |