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options: Add documentation for filter-dump 

Add a short description for the filter-dump command line options.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
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Thomas Huth 2015-10-13 12:40:02 +02:00 committed by Jason Wang
parent 9d3e12e881
commit d3e0c032f5
1 changed files with 8 additions and 0 deletions
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qemu-options.hx
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@ -2012,6 +2012,7 @@ qemu -m 512 -object memory-backend-file,id=mem,size=512M,mem-path=/hugetlbfs,sha
Dump network traffic on VLAN @var{n} to file @var{file} (@file{qemu-vlan0.pcap} by default). Dump network traffic on VLAN @var{n} to file @var{file} (@file{qemu-vlan0.pcap} by default).
At most @var{len} bytes (64k by default) per packet are stored. The file format is At most @var{len} bytes (64k by default) per packet are stored. The file format is
libpcap, so it can be analyzed with tools such as tcpdump or Wireshark. libpcap, so it can be analyzed with tools such as tcpdump or Wireshark.
Note: For devices created with '-netdev', use '-object filter-dump,...' instead.
@item -net none @item -net none
Indicate that no network devices should be configured. It is used to Indicate that no network devices should be configured. It is used to
@ -3665,6 +3666,13 @@ queue @var{all|rx|tx} is an option that can be applied to any netfilter.
@option{tx}: the filter is attached to the transmit queue of the netdev, @option{tx}: the filter is attached to the transmit queue of the netdev,
where it will receive packets sent by the netdev. where it will receive packets sent by the netdev.
@item -object filter-dump,id=@var{id},netdev=@var{dev},file=@var{filename}][,maxlen=@var{len}]
Dump the network traffic on netdev @var{dev} to the file specified by
@var{filename}. At most @var{len} bytes (64k by default) per packet are stored.
The file format is libpcap, so it can be analyzed with tools such as tcpdump
or Wireshark.
@end table @end table
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