Re: add an API to check if a streamming mapping needs sync calls

On 2020-06-29 15:03, Christoph Hellwig wrote:

Hi all,

this series lifts the somewhat hacky checks in the XSK code if a DMA
streaming mapping needs dma_sync_single_for_{device,cpu} calls to the
DMA API.

Thanks a lot for working on, and fixing this, Christoph!

I took the series for a spin, and there are (obviously) no performance
regressions.

Would the patches go through the net/bpf trees or somewhere else?

For the series:
Tested-by: Björn Töpel <redacted>
Acked-by: Björn Töpel <redacted>


Björn

Diffstat:
  Documentation/core-api/dma-api.rst |    8 +++++
  include/linux/dma-direct.h         |    1
  include/linux/dma-mapping.h        |    5 +++
  include/net/xsk_buff_pool.h        |    6 ++--
  kernel/dma/direct.c                |    6 ++++
  kernel/dma/mapping.c               |   10 ++++++
  net/xdp/xsk_buff_pool.c            |   54 ++-----------------------------------
  7 files changed, 37 insertions(+), 53 deletions(-)