On Jan 17, 2019, at 2:39 PM, Florian Fainelli <f.faine...@gmail.com> wrote:

> DSA currently supports the following tagging protocols (details can be
> found under net/dsa/tag_*.c in Linux source for exactly length and offset
> within the Ethernet frame):

Unfortunately, tag_brcm.c, for example, doesn't give *enough* details - it has 
a bunch of uncommented #defines (some of which suggest overlap between fields 
in the same byte of the tag) and some code that doesn't handle all the fields 
in both ingress and egress tags.

Can you construct "ASCII-art" diagrams and explanatory text, of the sort seen 
in, for example:

        http://www.tcpdump.org/linktypes/LINKTYPE_LINUX_SLL.html

for the tags?
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