Re: [dpdk-dev] [PATCH v3 3/4] net/tap: add netlink back-end for flow API

[Ferruh Yigit <ferruh.yigit@intel.com>]

On 3/7/2017 4:35 PM, Pascal Mazon wrote:
> Each kernel netdevice may have queueing disciplines set for it, which
> determine how to handle the packet (mostly on egress). That's part of
> the TC (Traffic Control) mechanism.

This is nice.
qdisc is egress part of the network stack right, is there any ingress
part of it?

> 
> Through TC, it is possible to set filter rules that match specific
> packets, and act according to what is in the rule. This is a perfect
> candidate to implement the flow API for the tap PMD, as it has an
> associated kernel netdevice automatically.
> 
> Each flow API rule will be translated into its TC counterpart.

What can be use cases here?

> 
> To leverage TC, it is necessary to communicate with the kernel using
> netlink. This patch introduces a library to help that communication.
> 

What do you think implementing these out of tap PMD? These can be used
by KNI too.

> Inside netlink.c, functions are generic for any netlink messaging.
> Inside tcmsgs.c, functions are specific to deal with TC rules.
> 
> Signed-off-by: Pascal Mazon <pascal.mazon@6wind.com>
> Acked-by: Olga Shern <olgas@mellanox.com>
<...>