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# Date Author Comment
f157ed20 02/02/2011 12:50 am Michael S. Tsirkin

tap: safe sndbuf default

With current sndbuf default value, a blocked
target guest can prevent another guest from
transmitting any packets. While current
sndbuf value (1M) is reported to help some
UDP based workloads, the default should
be safe (0).

Signed-off-by: Michael S. Tsirkin <>...
445d892f 09/07/2010 08:27 pm Michael S. Tsirkin

tap: add APIs for vnet header length

Add APIs to control host header length. First user
will be vhost-net.

Signed-off-by: Michael S. Tsirkin <>
91ca60e0 06/22/2010 11:15 pm Michael Tokarev

give some useful error messages when tap open

In net/tap-linux.c, when manipulation of /dev/net/tun fails, it prints
(with fprintf) something like this:

warning: could not open /dev/net/tun: no virtual network emulation

this has 2 issues:
1) it is not a warning really, it's a fatal error (kvm exits after...
1ecda02b 03/16/2010 05:58 pm Markus Armbruster

error: Replace qemu_error() by error_report()

error_report() terminates the message with a newline. Strip it it
from its arguments.

This fixes a few error messages lacking a newline:
net_handle_fd_param()'s "No file descriptor named %s found", and
tap_open()'s "vnet_hdr=1 requested, but no kernel support for...
2f792016 03/16/2010 05:55 pm Markus Armbruster

error: Move qemu_error & friends into their own header
6720b35b 12/03/2009 05:41 pm Pierre Riteau

net: fix TAP networking on host kernels without IFF_VNET_HDR support

vnet_hdr is initialized at 1 by default. We need to reset it to 0 if
the kernel doesn't support IFF_VNET_HDR.

Signed-off-by: Pierre Riteau <>
Signed-off-by: Mark McLoughlin <>...
2e50326c 12/03/2009 05:41 pm Pierre Riteau

net: check for TUNSETOFFLOAD support before trying to enable offload features

This avoids the "TUNSETOFFLOAD ioctl() failed: Invalid argument" message
on kernels without TUNSETOFFLOAD support.

Signed-off-by: Pierre Riteau <>
Signed-off-by: Mark McLoughlin <>...
9c282718 10/30/2009 03:39 pm Mark McLoughlin

net: move UFO support detection to tap-linux.c

Only supported on Linux

Signed-off-by: Mark McLoughlin <>
Signed-off-by: Anthony Liguori <>
c28b1c10 10/30/2009 03:39 pm Mark McLoughlin

net: move linux code into net/tap-linux.c

Signed-off-by: Mark McLoughlin <>
Signed-off-by: Anthony Liguori <>
15ac913b 10/30/2009 03:39 pm Mark McLoughlin

net: move tap_set_sndbuf() to tap-linux.c

TUNSETSNDBUF is only available on linux

Signed-off-by: Mark McLoughlin <>
Signed-off-by: Anthony Liguori <>
dc69004c 10/30/2009 03:39 pm Mark McLoughlin

net: move tap_probe_vnet_hdr() to tap-linux.c

Only Linux has support for IFF_VNET_HDR

Signed-off-by: Mark McLoughlin <>
Signed-off-by: Anthony Liguori <>
1faac1f7 10/30/2009 03:39 pm Mark McLoughlin

net: move tap_set_offload() code into tap-linux.c

TUNSETOFFLOAD is only available on Linux

Signed-off-by: Mark McLoughlin <>
Signed-off-by: Anthony Liguori <>