On Fri, Sep 11, 2020 at 09:42:25PM +0000, Clint Sbisa wrote: > There's no DMA involved with this BAR-- the driver writes a portion of the > packet contents in addition to the descriptors, which generally increases the > number of TLPs if write-combine isn't used. Furthermore, this BAR is only used > for writes and never for reads. You use DPDK without DMA? How does receive work? > As Jason noted in the other reply to this email, the Linux ENA driver makes use > of WC by using devm_ioremap_wc(). As Ben noted we don't have kernel accessors to make this portable or safe :( Jason
