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SubjectRe: in kernel 2.6.x, tun/tap nic supports vlan packets
Hi, Jaso

Would you like to code review these 2 patches?

Thanks a lot.
Zhu Yanjun
On 04/17/2014 11:35 AM, zhuyj wrote:
> Hi, all
>
> In kernel 2.6.x, linux depends on nic vlan hardware acceleration to
> insert/extract
> vlan tag. In this scene, in kernel 2.6.x
>
> _____ ________
> A | | B | | C
> vlan packets-->| tap |----->|vlan nic|--->
> |_____| |________|
>
> We hope vlan packets pass through tap and vlan nic from A to c.
> But in kernel 2.6.x, linux kernel can not extract vlan tag. It depends
> on nic vlan hardware acceleration. It is well known that tap nic has no
> vlan acceleration. So in the above scene, vlan packets can not be
> handled by
> tap nic. These vlan packets will be discarded in B. They can not
> arrive at C.
>
> In kernel 3.x, linux can handle vlan packets. It does not depend on
> nic vlan
> hardware acceleration. So the above scene can work well in kernel 3.x.
>
> To resolve the above in kernel 2.6.x, we simulated vlan hardware
> acceleration in
> tun/tap driver. Then followed the logic of commit commit 4fba4ca4
> [vlan: Centralize handling of hardware acceleration] to modify the
> vlan packets
> process in kernel 2.6.x. In the end, the above scene can work well in
> patched
> kernel 2.6.x.
>
> Please comment on it. Any reply is appreciated.
>
> Hi, Willy
>
> These 2 patches are for linux2.6.x. These can work well here. Please
> help to merge
> linux 2.6.32.x. Thanks a lot.
>
> Best Regards!
> Zhu Yanjun
>



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