Re: Does the driver directly map TOS/DSCP tags toUser Priority into QoS Control field?

On Thu, 2009-02-19 at 15:39 +0800, Alex Chpenst wrote:
> Thanks!! I've looked at ipw2200, there is a function:
> 
> ipw_get_tx_queue_number(struct ipw_priv *priv, u16 priority)
> 
> which maps the packet priority to the right TX Queue. But I can't find
> out what "priority" is. Does it come from ieee80211? Is it User
> Priority from VLAN tag? Is it User Priority from TOS field of IP
> packet?
> 
> This function is called from another one:
> 
> ipw_tx_skb(struct ipw_priv *priv, struct ieee80211_txb *txb, int pri)
> {
> ...
> int tx_id = ipw_get_tx_queue_number(priv, pri);
> ...
> }
> where "priority" is "pri". Now, this one is called from:
> 
> ipw_net_hard_start_xmit(struct ieee80211_txb *txb, struct net_device
> *dev, int pri) {
> ...
> ret = ipw_tx_skb(priv, txb, pri);
> ...
> }
> 
> I stop here, as I can't find where "ipw_net_hard_start_xmit" is called
> from and where this "pri" variable comes from...

Take a look at drivers/net/wireless/ipw2x00/libipw_tx.c.

Thanks,
-yi


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