Julian reports that commit 341ac980eab9 ("xsk: Support tx_metadata_len")
can break existing use cases which don't zero-initialize xdp_umem_reg
padding. Fix it (while still breaking a minority of new users of tx
metadata), update the docs, update the selftest and sprinkle some
BUILD_BUG_ONs to hopefully catch similar issues in the future.
Thank you Julian for the report and for helping to chase it down!
Reported-by: Julian Schindel <mail@xxxxxxxxxxxxxxxx>
Cc: Magnus Karlsson <magnus.karlsson@xxxxxxxxx>
Stanislav Fomichev (3):
xsk: require XDP_UMEM_TX_METADATA_LEN to actuate tx_metadata_len
selftests/bpf: Add XDP_UMEM_TX_METADATA_LEN to XSK TX metadata test
xsk: Try to make xdp_umem_reg extension a bit more future-proof
Documentation/networking/xsk-tx-metadata.rst | 16 ++++++++-----
include/uapi/linux/if_xdp.h | 4 ++++
net/xdp/xdp_umem.c | 9 +++++---
net/xdp/xsk.c | 23 ++++++++++---------
tools/include/uapi/linux/if_xdp.h | 4 ++++
.../selftests/bpf/prog_tests/xdp_metadata.c | 3 ++-
6 files changed, 38 insertions(+), 21 deletions(-)
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2.45.2
