Re: [PATCH bpf-next v6 10/12] samples/bpf: add buffer recycling for unaligned chunks to xdpsock

[Jonathan Lemon]

On 26 Aug 2019, at 19:25, Kevin Laatz wrote:

> This patch adds buffer recycling support for unaligned buffers. Since we
> don't mask the addr to 2k at umem_reg in unaligned mode, we need to make
> sure we give back the correct (original) addr to the fill queue. We achieve
> this using the new descriptor format and associated masks. The new format
> uses the upper 16-bits for the offset and the lower 48-bits for the addr.
> Since we have a field for the offset, we no longer need to modify the
> actual address. As such, all we have to do to get back the original address
> is mask for the lower 48 bits (i.e. strip the offset and we get the address
> on it's own).
>
> Signed-off-by: Kevin Laatz <kevin.la...@intel.com>
> Signed-off-by: Bruce Richardson <bruce.richard...@intel.com>
Acked-by: Jonathan Lemon <jonathan.le...@gmail.com>