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SubjectRe: [mm PATCH v3 00/23] Add support for DMA writable pages being writable by the network stack
On Thu, Nov 10, 2016 at 3:34 AM, Alexander Duyck
<alexander.h.duyck@intel.com> wrote:
> The first 19 patches in the set add support for the DMA attribute
> DMA_ATTR_SKIP_CPU_SYNC on multiple platforms/architectures. This is needed
> so that we can flag the calls to dma_map/unmap_page so that we do not
> invalidate cache lines that do not currently belong to the device. Instead
> we have to take care of this in the driver via a call to
> sync_single_range_for_cpu prior to freeing the Rx page.
>
> Patch 20 adds support for dma_map_page_attrs and dma_unmap_page_attrs so
> that we can unmap and map a page using the DMA_ATTR_SKIP_CPU_SYNC
> attribute.
>
> Patch 21 adds support for freeing a page that has multiple references being
> held by a single caller. This way we can free page fragments that were
> allocated by a given driver.
>
> The last 2 patches use these updates in the igb driver, and lay the
> groundwork to allow for us to reimplement the use of build_skb.
>
> v1: Minor fixes based on issues found by kernel build bot
> Few minor changes for issues found on code review
> Added Acked-by for patches that were acked and not changed
>
> v2: Added a few more Acked-by
> Submitting patches to mm instead of net-next
>
> v3: Added Acked-by for PowerPC architecture
> Dropped first 3 patches which were accepted into swiotlb tree
> Dropped comments describing swiotlb changes.
>
> ---
>
> Alexander Duyck (23):
> arch/arc: Add option to skip sync on DMA mapping
> arch/arm: Add option to skip sync on DMA map and unmap
> arch/avr32: Add option to skip sync on DMA map
> arch/blackfin: Add option to skip sync on DMA map
> arch/c6x: Add option to skip sync on DMA map and unmap
> arch/frv: Add option to skip sync on DMA map
> arch/hexagon: Add option to skip DMA sync as a part of mapping
> arch/m68k: Add option to skip DMA sync as a part of mapping
> arch/metag: Add option to skip DMA sync as a part of map and unmap
> arch/microblaze: Add option to skip DMA sync as a part of map and unmap
> arch/mips: Add option to skip DMA sync as a part of map and unmap
> arch/nios2: Add option to skip DMA sync as a part of map and unmap
> arch/openrisc: Add option to skip DMA sync as a part of mapping
> arch/parisc: Add option to skip DMA sync as a part of map and unmap
> arch/powerpc: Add option to skip DMA sync as a part of mapping
> arch/sh: Add option to skip DMA sync as a part of mapping
> arch/sparc: Add option to skip DMA sync as a part of map and unmap
> arch/tile: Add option to skip DMA sync as a part of map and unmap
> arch/xtensa: Add option to skip DMA sync as a part of mapping
> dma: Add calls for dma_map_page_attrs and dma_unmap_page_attrs
> mm: Add support for releasing multiple instances of a page
> igb: Update driver to make use of DMA_ATTR_SKIP_CPU_SYNC
> igb: Update code to better handle incrementing page count
>
>
> arch/arc/mm/dma.c | 5 ++
> arch/arm/common/dmabounce.c | 16 ++++--
> arch/avr32/mm/dma-coherent.c | 7 ++-
> arch/blackfin/kernel/dma-mapping.c | 8 +++
> arch/c6x/kernel/dma.c | 14 ++++-
> arch/frv/mb93090-mb00/pci-dma-nommu.c | 14 ++++-
> arch/frv/mb93090-mb00/pci-dma.c | 9 +++
> arch/hexagon/kernel/dma.c | 6 ++
> arch/m68k/kernel/dma.c | 8 +++
> arch/metag/kernel/dma.c | 16 +++++-
> arch/microblaze/kernel/dma.c | 10 +++-
> arch/mips/loongson64/common/dma-swiotlb.c | 2 -
> arch/mips/mm/dma-default.c | 8 ++-
> arch/nios2/mm/dma-mapping.c | 26 +++++++---
> arch/openrisc/kernel/dma.c | 3 +
> arch/parisc/kernel/pci-dma.c | 20 ++++++--
> arch/powerpc/kernel/dma.c | 9 +++
> arch/sh/kernel/dma-nommu.c | 7 ++-
> arch/sparc/kernel/iommu.c | 4 +-
> arch/sparc/kernel/ioport.c | 4 +-
> arch/tile/kernel/pci-dma.c | 12 ++++-
> arch/xtensa/kernel/pci-dma.c | 7 ++-
> drivers/net/ethernet/intel/igb/igb.h | 7 ++-
> drivers/net/ethernet/intel/igb/igb_main.c | 77 +++++++++++++++++++----------
> include/linux/dma-mapping.h | 20 +++++---
> include/linux/gfp.h | 2 +
> mm/page_alloc.c | 14 +++++
> 27 files changed, 246 insertions(+), 89 deletions(-)
>

So I am just wondering if I need to resubmit this to pick up the new
"Acked-by"s or if I should just wait?

As I said in the description my hope is to get this into the -mm tree
and I am not familiar with what the process is for being accepted
there.

Thanks.

- Alex

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