Re: How device could assemble qdisc for self?

[Vladimir Kondratiev <vkondra@mail.ru>]

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Forget to mention,
after these 6 qdiscs I described, there is round robin scheduler that do 
actually sends packets to hard_start_xmit.

On Wednesday 16 June 2004 23:57, Vladimir Kondratiev wrote:
> Hi,
> I am a bit confused looking at qdisc related stuff. Could someone please
> point me to right documentation, code to look for etc?
>
> I'd like to employ NIC with many Tx DMA queues, designated for different
> types of traffic. Jamal pointed to qdiscs as a way to do it.
>
> My current idea is as following:
>
> I need to arrange the following qdisc structure:
>
> - total 6 queues (FIFO) maintained;
>
> - 4 queues get packets accordingly to 802.1D priority tags (some simple
> fixed mapping, actually those described in TGe - standard for wireless QoS)
> Table follows, but really it does not matter.
>
> 802.1D   queue(access category)
> 1        AC_BK     Background
> 2        AC_BK
> 0        AC_BE     Best effort
> 3        AC_BE
> 4        AC_VI     Video
> 5        AC_VI
> 6        AC_VO     Voice
> 7        AC_VO
>
> - 1 queue used for all bcast/mcast packets (wireless AP need it)
>
> - 1 queue used for packets marked by application in some specific way
> (don't know how exactly, long story, next time)
>
> Each queue corresponds to one tx DMA queue within NIC. Each one should be
> stopped/started separately. Then, in hard_start_xmit, I will select proper
> DMA queue based on skb->priority. When DMA queue is full, I will stop
> corresponding qdisc.
>
> Does this structure make sense? Could it be done easier?
>
> Vladimir
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