> From: David Marchand [mailto:david.march...@redhat.com] > Sent: Wednesday, 9 July 2025 14.40 > > As part of the effort to limit undefined behaviors in DPDK code, some > structure alignments revealed not to be accurate enough. > At the moment two structures have been identified but others may be > found while running more parts of DPDK with UBSan. > > Though the calling code can explicitly request alignment, > we would prefer to put the alignment constraints as part of the > structure definition itself. > > Such changes are ABI breakages. > > Signed-off-by: David Marchand <david.march...@redhat.com> > --- > doc/guides/rel_notes/deprecation.rst | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/doc/guides/rel_notes/deprecation.rst > b/doc/guides/rel_notes/deprecation.rst > index e2d4125308..4ae561d670 100644 > --- a/doc/guides/rel_notes/deprecation.rst > +++ b/doc/guides/rel_notes/deprecation.rst > @@ -57,6 +57,10 @@ Deprecation Notices > ``__atomic_thread_fence`` must be used for patches that need to be > merged in > 20.08 onwards. This change will not introduce any performance > degradation. > > +* lib: multiple issues relating to unaligned accesses have been > detected using the UBSan checker. > + As part of resolving those issues, alignment in some structures will > be updated in 25.11, > + namely (but not exhaustively): ``struct rte_stack_lf_head`` and > ``struct rte_mp_msg``. > + > * lib: will fix extending some enum/define breaking the ABI. There are > multiple > samples in DPDK that enum/define terminated with a ``.*MAX.*`` value > which is > used by iterators, and arrays holding these values are sized with > this > -- > 2.50.0
Yes, please. Acked-by: Morten Brørup <m...@smartsharesystems.com>
