On Thu, Sep 24, 2026 at 4:00 PM David Marchand <[email protected]> wrote: > > On Thu, 24 Sept 2026 at 14:33, Eugenio Perez Martin <[email protected]> > wrote: > > > diff --git a/kernel/linux/uapi/linux/vfio.h > > > b/kernel/linux/uapi/linux/vfio.h > > > index 79bf8c0cc5e4..c85dcbfe302b 100644 > > > --- a/kernel/linux/uapi/linux/vfio.h > > > +++ b/kernel/linux/uapi/linux/vfio.h > > [...] > > > > @@ -1468,6 +1497,64 @@ struct vfio_device_feature_bus_master { > > > }; > > > #define VFIO_DEVICE_FEATURE_BUS_MASTER 10 > > > > > > +/** > > > + * Upon VFIO_DEVICE_FEATURE_GET create a dma_buf fd for the > > > + * regions selected. > > > + * > > > + * open_flags are the typical flags passed to open(2), eg O_RDWR, > > > O_CLOEXEC, > > > + * etc. offset/length specify a slice of the region to create the dmabuf > > > from. > > > + * nr_ranges is the total number of (P2P DMA) ranges that comprise the > > > dmabuf. > > > + * > > > + * flags should be 0. > > > + * > > > + * Return: The fd number on success, -1 and errno is set on failure. > > > + */ > > > +#define VFIO_DEVICE_FEATURE_DMA_BUF 11 > > > + > > > +struct vfio_region_dma_range { > > > + __u64 offset; > > > + __u64 length; > > > +}; > > > + > > > +struct vfio_device_feature_dma_buf { > > > + __u32 region_index; > > > + __u32 open_flags; > > > + __u32 flags; > > > + __u32 nr_ranges; > > > + struct vfio_region_dma_range dma_ranges[] __counted_by(nr_ranges); > > > > Not all gcc versions of CI like the __counted_by argument. Should I > > not import this header? > > > > We import and update all uapi headers or none in DPDK, for a given > kernel version. > And the CI checks that the imported headers are aligned with the > announced kernel version (meaning that we can't update our local copy > of the header). > > We could import linux/stddef.h but it may become a problem in the future. > Or pass a -D'__counted_by(a)=' option in the DPDK project CFLAGS if > the compiler does not support __counted_by...
I guess this one is the most straightforward. I'll try to make the needed changes in meson and send a v2. Thanks! > Or another option would be to update all users of linux/vfio.h in DPDK... :-( > > Other ideas? > > -- > David Marchand >
