> is it possible to set the skb->priority on arp packets > generated by the kernel? > I want to to set the 802.1p priority on arp and ip packets on > an interface. On ip packets, this can be done by the iptables > CLASSIFY target and the > skb->priority mapping from the vlan implementation. > > any ideas?
Currently unclassified ip packets have skb->priority set in ipsockglue, by translating the IP TOS field into a Linux priority. This is not the same priority as 802.1p, rather, it's a Linux-based OS priority classification for dequeuing priority in schedulers such as sch_prio. 802.1p lives in the VLAN tag, which is separate from skb->priority. I'd suggest reading http://lartc.org/howto/lartc.qdisc.classless.html to see what exactly skb->priority is used for in sch_prio and pfifo_fast, and how the ip layer determines a packet's priority. The skb->priority field is also used in other ways in other qdiscs I'm not completely familiar with, but it's not directly related to priority of the packet. I'd need to look closer at those qdiscs to be specific. That being said, the only way I can think of manipulating skb->priority on arp packets (and actually setting it) is modifying a qdisc to set skb->priority if it matches a filter created using the tc command. Cheers, -PJ Waskiewicz - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
