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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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3
drivers/net/xen-netback/common.h
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@ -179,6 +179,9 @@ struct xenvif {
/* Statistics */
unsigned long rx_gso_checksum_fixup;
unsigned long tx_zerocopy_sent;
unsigned long tx_zerocopy_success;
unsigned long tx_zerocopy_fail;
/* Miscellaneous private stuff. */
struct net_device *dev;