netdev - Re: SFQ on HFSC leaf does not seem to work

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Date:	Sat, 31 Dec 2011 17:17:21 -0500
From:	"John A. Sullivan III" <jsullivan@...nsourcedevel.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: SFQ on HFSC leaf does not seem to work

On Fri, 2011-12-23 at 10:26 -0500, John A. Sullivan III wrote:
> <snip>> 
> > > tc filter add dev ifb0 parent 1:0 protocol ip prio 1 u32 ht 6:0 match
> > > tcp src 443 0x00ff flowid 1:10
> > 
> > why "src 443 0x00ff" ? It should be "src 443 0xffff"
> That's what I tried at first but nothing matched the filter.  I assumed
> it was because it objected to a value in the dst field so I masked it
> off and it worked.
> > 
> > > tc filter add dev ifb0 parent 1:0 protocol ip prio 1 u32 ht 6:0 match
> > > tcp dst 822 0xff00 flowid 1:30
> > 
> > same here : "dst 822 0xffff"
> Same as above.  No filter matches when using that mask.
> > 
<snip>
Oops! Must have not matched for some other reason - this is a clear
binary brain cramp! This now appears to be working:

tc filter add dev ifb0 parent 1:0 protocol ip prio 1 handle 6: u32 divisor 1
tc filter add dev ifb0 parent 1:0 protocol ip prio 1 u32 match ip protocol 6 0xff link 6: offset at 0 mask 0x0f00 shift 6 plus 0
tc filter add dev ifb0 parent 1:0 protocol ip prio 1 u32 ht 6:0 match tcp dst 822 0xffff at nexthdr+2 flowid 1:30
tc filter add dev ifb0 parent 1:0 protocol ip prio 1 u32 ht 6:0 match tcp src 822 0xffff at nexthdr+0 flowid 1:30
# Send packets <64 bytes (u16 0 0xffc0 at 2) with only the ACK flag set (match u8 16 0xff at nexthdr+13) to the low latency queue
tc filter add dev ifb0 parent 1:0 protocol ip prio 1 u32 ht 6:0 match u16 0 0xffc0 at 2 match u8 16 0xff at nexthdr+13 flowid 1:30
tc filter add dev ifb0 parent 1:0 protocol ip prio 1 u32 ht 6:0 match tcp src 443 0xffff at nexthdr+0 flowid 1:10

Thanks - John

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