Kernel networking offload--what 's flow/flower/flowtable offload?

risonwung

I am learning network hardware acceleration in Linux kernel for quiet a long time, but there still are several problems that make me very very confused. I hope to get anyone's help.

Thanks very much.

After deeply inspecting source code in kernel ,what confued me all the time are:

1. I can't clearly distinguish Flower offload, Flow offload, Flowtable offload, Flowtable HW offload.


2.What's the relationship between Flower offload and Flow offload? In driver implementation(kenerl version 5.4), there always be both TC_SETUP_BLOCK and TC_SETUP_CLSFLOWER.

   As far as i know, TC_SETUP_CLSFLOWER indicates TC flower offload. Does TC_SETUP_BLOCK mean Flow offload? If so, what is Flow offload? Is it netfilter offload?


3.Does flowtable offload mean a fast path for packet process implemented by software in kernel, while flowtable HW offload means a fast path implemented by hardware?