netdev - add an API to check if a streamming mapping needs sync calls

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Message-Id: <20200629130359.2690853-1-hch@lst.de>
Date:   Mon, 29 Jun 2020 15:03:55 +0200
From:   Christoph Hellwig <hch@....de>
To:     Björn Töpel <bjorn.topel@...el.com>
Cc:     Magnus Karlsson <magnus.karlsson@...el.com>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        iommu@...ts.linux-foundation.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: add an API to check if a streamming mapping needs sync calls

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.


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(-)