Re: [PATCH v2 bpf 1/1] xskmap: reject TX-only AF_XDP sockets

[Linpu Yu]

Thanks for catching this. fbfc504a24f5 is not the correct Fixes target.

At that point, AF_XDP did not yet have TX ring support in the UAPI, and
xsk_bind() also required xs->rx to exist, so a TX-only socket was not
constructible there.

Tx queue support came later in f61459030ec7 ("xsk: add Tx queue setup and
mmap support"), but XSKMAP updates still rejected sockets without an Rx
ring via xsk_is_setup_for_bpf_map().

The regression was introduced when 968be23ceaca removed that check.
I have corrected the Fixes tag accordingly in v3.