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Re: [Qemu-devel] Re: [PATCH] Fix TAP networking on host kernels without

From: Pierre Riteau
Subject: Re: [Qemu-devel] Re: [PATCH] Fix TAP networking on host kernels without IFF_VNET_HDR support
Date: Tue, 24 Nov 2009 12:17:04 +0100

On 24 nov. 2009, at 11:28, Mark McLoughlin wrote:

> On Tue, 2009-11-24 at 10:06 +0100, Pierre Riteau wrote:
>> 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 <address@hidden>
> Thanks Pierre, I see why this is needed now
> Acked-by: Mark McLoughlin <address@hidden>
> Cheers,
> Mark.

Thanks for your rapid answer!

BTW, every time I run qemu I see this error message:

    TUNSETOFFLOAD ioctl() failed: Invalid argument

It is caused by the piece of code at the end of net/tap-linux.c:

    if (ioctl(fd, TUNSETOFFLOAD, offload) != 0) {
        offload &= ~TUN_F_UFO;
        if (ioctl(fd, TUNSETOFFLOAD, offload) != 0) {
            fprintf(stderr, "TUNSETOFFLOAD ioctl() failed: %s\n",

Isn't there a way to detect whether the kernel supports the TUNSETOFFLOAD ioctl 
at all?

Pierre Riteau -- http://perso.univ-rennes1.fr/pierre.riteau/

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