From 1bb332af4cd889e4b64dacbf4a793ceb3a70445d Mon Sep 17 00:00:00 2001 From: Zoltan Kiss Date: Thu, 6 Mar 2014 21:48:28 +0000 Subject: xen-netback: Add stat counters for zerocopy These counters help determine how often the buffers had to be copied. Also they help find out if packets are leaked, as if "sent != success + fail", there are probably packets never freed up properly. NOTE: if bisect brought you here, you should apply the series up until "xen-netback: Timeout packets in RX path", otherwise Windows guests can't work properly and malicious guests can block other guests by not releasing their sent packets. Signed-off-by: Zoltan Kiss Signed-off-by: David S. Miller --- drivers/net/xen-netback/interface.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) (limited to 'drivers/net/xen-netback/interface.c') diff --git a/drivers/net/xen-netback/interface.c b/drivers/net/xen-netback/interface.c index 1fe9fe523cc..44df8581b4d 100644 --- a/drivers/net/xen-netback/interface.c +++ b/drivers/net/xen-netback/interface.c @@ -238,6 +238,21 @@ static const struct xenvif_stat { "rx_gso_checksum_fixup", offsetof(struct xenvif, rx_gso_checksum_fixup) }, + /* If (sent != success + fail), there are probably packets never + * freed up properly! + */ + { + "tx_zerocopy_sent", + offsetof(struct xenvif, tx_zerocopy_sent), + }, + { + "tx_zerocopy_success", + offsetof(struct xenvif, tx_zerocopy_success), + }, + { + "tx_zerocopy_fail", + offsetof(struct xenvif, tx_zerocopy_fail) + }, }; static int xenvif_get_sset_count(struct net_device *dev, int string_set) -- cgit v1.2.3-70-g09d2