[dpdk-dev] [EXT] [PATCH] compressdev: clarify destination buffer size for corner case

[Akhil Goyal]

> >
> > ----------------------------------------------------------------------
> > Clarify the corner case with incompressible data whereby the output can
> > actually be greater than the uncompressed data.
> >
> > Signed-off-by: Fiona Trahe <fiona.trahe at intel.com>
> > ---
> >  lib/librte_compressdev/rte_comp.h |    6 ++++++
> >  1 files changed, 6 insertions(+), 0 deletions(-)
> >
> > diff --git a/lib/librte_compressdev/rte_comp.h
> > b/lib/librte_compressdev/rte_comp.h
> > index b7474c4..95306c5 100644
> > --- a/lib/librte_compressdev/rte_comp.h
> > +++ b/lib/librte_compressdev/rte_comp.h
> > @@ -323,6 +323,12 @@ struct rte_comp_op {
> >  	 * If the output data is expected to be bigger than this a chain of
> >  	 * mbufs can be passed to the PMD if the PMD's capabilities indicate
> >  	 * it supports this.
> > +	 *
> > +	 * @note, if incompressible data is passed to an engine for
> > compression
> > +	 * using RTE_COMP_ALGO_DEFLATE, it's possible for the output data
> > +	 * to be larger than the uncompressed data, due to the inclusion
> > +	 * of the DEFLATE header blocks. The size of m_dst should
> > accommodate
> > +	 * this, else OUT_OF_SPACE errors can be expected in this case.
> >  	 */
> >
> >  	struct {
> > --
> > 1.7.0.7
> Acked-by: Shally Verma <shallyv at marvell.com>

Applied to dpdk-next-crypto

Thanks.