On 17-09-05 06:01 PM, Roopa Prabhu wrote:
yes, like Nikolay says we have been discussing this as well. Nikolay's
patch is a cleaver and most importantly non-invasive
way today given the anchor point for tc rules is a netdev. we have
also considered a separate implicit tc anchor device.
lo seemed like a good fit for all global rules given it is already
available. And it is not uncommon to hang off global
network config on the loopback interface.
IMO, Jiri has done all the necessary work already with the concept of
blocks. We dont really need the netdev to be the attachment point.
You can add to a block in many locations in the kernel by
constructing the proper "coordinates" in the tcmsg.
i.e this:
tcmsg {
unsigned char tcm_family;
unsigned char tcm__pad1;
unsigned short tcm__pad2;
int tcm_ifindex;
__u32 tcm_handle;
__u32 tcm_parent;
}
If you were to set tcm_ifindex to -1 (since that is not a legit
ifindex) then all we need to do is define a parent for a
different location. Current locations tied to netdevs are:
-----
#define TC_H_ROOT (0xFFFFFFFFU)
#define TC_H_INGRESS (0xFFFFFFF1U)
#define TC_H_CLSACT TC_H_INGRESS
#define TC_H_MIN_INGRESS 0xFFF2U
#define TC_H_MIN_EGRESS 0xFFF3U
-----
You should be able to say add a location which maps to a pre-routing
or post-routing etc; and this would work as well...
cheers,
jamal
