On 2020-12-21 4:01 a.m., Jesper Dangaard Brouer wrote:
On Sat, 19 Dec 2020 10:30:57 -0500
Sorry to interject:
Does it make sense to use it to store arbitrary metadata or a scratchpad
in this space? Something equivalent to skb->cb which is lacking in
XDP.
Well, XDP have the data_meta area. But difficult to rely on because a
lot of driver don't implement it. And Saeed and I plan to use this
area and populate it with driver info from RX-descriptor.
What i was thinking is some scratch pad that i can write to within
an XDP prog (not driver); example, in a prog array map the scratch
pad is written by one program in the array and read by another later on.
skb->cb allows for that. Unless you mean i can already write to some
XDP data_meta area?
cheers,
jamal
