Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757971AbcJXSFI (ORCPT ); Mon, 24 Oct 2016 14:05:08 -0400 Received: from mga06.intel.com ([134.134.136.31]:58074 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757850AbcJXSFE (ORCPT ); Mon, 24 Oct 2016 14:05:04 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.31,542,1473145200"; d="scan'208";a="183258700" Subject: [net-next PATCH RFC 00/26] Add support for DMA writable pages being writable by the network stack From: Alexander Duyck To: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: davem@davemloft.net, brouer@redhat.com Date: Mon, 24 Oct 2016 08:04:26 -0400 Message-ID: <20161024115737.16276.71059.stgit@ahduyck-blue-test.jf.intel.com> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4851 Lines: 95 The first 21 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 22 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 23 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 3 patches use these updates in the igb driver to allow for us to reimplement the use of build_skb which hands a writable page off to the stack. My hope is to get the series accepted into the net-next tree as I have a number of other Intel drivers I could then begin updating once these patches are accepted. Any feedback is welcome. Specifically if there is something I overlooked design-wise or an architecture I missed please let me know and I will add it to this patch set. If needed I can look into breaking this into a smaller set of patches but this set is all that should be needed to then start looking at putting together a DMA page pool per device which I know is something Jesper has been working on. --- Alexander Duyck (26): swiotlb: Drop unused function swiotlb_map_sg swiotlb: Add support for DMA_ATTR_SKIP_CPU_SYNC 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 igb: Revert "igb: Revert support for build_skb in igb" arch/arc/mm/dma.c | 3 arch/arm/common/dmabounce.c | 16 +- arch/avr32/mm/dma-coherent.c | 7 + arch/blackfin/kernel/dma-mapping.c | 7 + arch/c6x/kernel/dma.c | 16 ++ arch/frv/mb93090-mb00/pci-dma-nommu.c | 16 ++ arch/frv/mb93090-mb00/pci-dma.c | 7 + 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 | 14 ++ 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 | 36 ++++- drivers/net/ethernet/intel/igb/igb_main.c | 207 +++++++++++++++++++++++------ drivers/xen/swiotlb-xen.c | 40 +++--- include/linux/dma-mapping.h | 20 ++- include/linux/gfp.h | 2 include/linux/swiotlb.h | 10 + lib/swiotlb.c | 56 ++++---- mm/page_alloc.c | 14 ++ 30 files changed, 435 insertions(+), 152 deletions(-) -- Signature