>> If all devices are configured to run in IOVA mode as VA, physical >> address field of mbuf (buf_iova) won't be used. In such cases, buf_iova >> space is free to use as a dynamic field. So a new dynamic field member >> (dynfield2) is added in mbuf structure to make use of that space. >> >> A new mbuf flag RTE_MBUF_F_DYNFIELD2 is introduced to help identify the >> mbuf that can use dynfield2. >> >> Signed-off-by: Shijith Thotton <sthot...@marvell.com> > > This seems like a complex and potentially error prone way to do this. > What is the use case? >
PCI drivers with the flag RTE_PCI_DRV_NEED_IOVA_AS_VA only works in IOVA mode as VA. buf_iova field of mbuf is not used by those PMDs and can be used as a dynamic area to save space. > How much of a performance gain? No change in performance.
