On Tue, 4 Oct 2022 18:02:56 -0700 Stanislav Fomichev wrote: > +1, sounds like a good alternative (got your reply while typing) > I'm not too versed in the rx_desc/rx_queue area, but seems like worst > case that bpf_xdp_get_hwtstamp can probably receive a xdp_md ctx and > parse it out from the pre-populated metadata? I'd think so, worst case the driver can put xdp_md into a struct and container_of() to get to its own stack with whatever fields it needs. > Btw, do we also need to think about the redirect case? What happens > when I redirect one frame from a device A with one metadata format to > a device B with another? If there is a program on Tx then it'd be trivial - just do the info <-> descriptor translation in the opposite direction than Rx. TBH I'm not sure how it'd be done in the current approach, either. Now I questioned the BTF way and mentioned the Tx-side program in a single thread, I better stop talking...
