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xen-netback: Add stat counters for zerocopy

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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 <zoltan.kiss@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Zoltan Kiss
2014-03-06 21:48:28 +00:00
committed by David S. Miller
parent 62bad3199a
commit 1bb332af4c
3 changed files with 26 additions and 1 deletions
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15
drivers/net/xen-netback/interface.c
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@@ -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)