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[Qemu-devel] [PATCH RFC 0/4] Dumping traffic when using netdev devices

From: Miguel Di Ciurcio Filho
Subject: [Qemu-devel] [PATCH RFC 0/4] Dumping traffic when using netdev devices
Date: Thu, 15 Jul 2010 17:22:56 -0300


This is a prototype suggestion. I mostly copied and pasted the code from
net/dump.c into net.c and made some adjustments. There is no command line
parsing involved yet, just the internals and small changes in net/tap.c and
net/slirp.c do make the thing work.

In my tests, using tap as backend, e1000 as a guest device and running iperf 
guest to host, the overhead of dumping the traffic caused a loss of around 30%
of performance.

I opened the dumped files in wireshark and they looked fine. When using slirp
all requests were dumped fine too.

- I have no clue on how to deal with tap+vhost, is it necessary?
- When using virtio-net, I'm not sure how to handle iovec when vnet_hdr=on
- Create a function to add dump to a netdev on the fly, is it necessary?
- Handle cleanups

Miguel Di Ciurcio Filho (4):
  net/dump: Make pcap structures public
  net: Introduce NetClientDump and auxiliary functions
  net/tap: Suggested support for NetClientDump
  net/slirp: Suggested support for NetClientDump

 net.c         |   90 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 net.h         |    8 +++++
 net/dump.c    |   21 -------------
 net/dump.h    |   21 +++++++++++++
 net/slirp.c   |    3 ++
 net/tap.c     |    3 ++
 qemu-common.h |    1 +
 7 files changed, 126 insertions(+), 21 deletions(-)

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