On Tue, Jul 04, 2017 at 05:09:21PM +0200, Matthias May wrote:
> Hi
>
> I'm trying to map the vlan_pcp onto 802.11 tid.
>
> net/wireless/util.c in mac80211 specifies:
>
> > /* skb->priority values from 256->263 are magic values to
> > * directly indicate a specific 802.1d priority. This is used
> > * to allow 802.1d priority to be passed directly in from VLAN
> > * tags, etc.
> > */
> > if (skb->priority >= 256 && skb->priority <= 263)
> > return skb->priority - 256;
>
> However the function dpif_netlink_queue_to_priority in /lib/dpif-netlink.c
> sets:
> > if (queue_id < 0xf000) {
> > *priority = TC_H_MAKE(1 << 16, queue_id + 1);
>
> With this the lowest skb_priority I can set is 0x10001, slightly over the
> magic values I need to use ;)
>
> Why is this offset of 0x10000 + 1 in place?
> Is something else in ovs about which I'm not aware dependant on this offset?
It's because this is mapping from an OpenFlow queue ID to a kernel
skb_priority value. These aren't the same namespace and so you need a
mapping function.
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