W dniu 18 maja 2011 00:28 użytkownik Shirley Ma [off-list ref] napisał:

On Tue, 2011-05-17 at 23:48 +0200, Michał Mirosław wrote:

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2011/5/17 Shirley Ma [off-list ref]:

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Looks like to use a new flag requires more time/work. I am thinking
whether we can just use HIGHDMA flag to enable zero-copy in macvtap

to

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avoid the new flag for now since mavctap uses real NICs as lower

device?

Is there any other restriction besides requiring driver to not recycle
the skb? Are there any drivers that recycle TX skbs?

Not more other restrictions, skb clone is OK. pskb_expand_head() looks
OK to me from code review.

Currently there is no drivers recycle TX skbs.

So why do you require the target device to have some flags at all?

Do I understand correctly, that this zero-copy feature is about
packets received from VMs?

Best Regards,
Michał Mirosław