[RFC 00/11] dma-mapping: add dma_alloc_attrs_node() and dma_alloc_coherent_node()

[Jakub Kicinski <kuba@kernel.org>]

Hi!

I want to add NUMA-awareness to a networking driver (bnxt) and
I run into the inexistence of dma_alloc_coherent_node().

On NUMA systems networking drivers want to allocate rings
and buffers close to the NAPI-handling core rather than
allocating all from where the device is connected.

Looks like we have accumulated 6 drivers which do:

       set_dev_node(dma_dev, numa_node);
       va = dma_alloc_coherent(...);
       set_dev_node(dma_dev, old_node);

IMHO this looks like an ugly hack. Can we add an API
with the Node ID explicitly passed in?


In the unlikely case anyone feels the urgent need to merge
this please pull (so that we can also pull this into net-next):

  git://git.kernel.org/pub/scm/linux/kernel/git/kuba/linux.git tags/dma_alloc_coherent_node

Jakub Kicinski (11):
  dma-contiguous: pass the NUMA node to dma_alloc_contiguous()
  dma-direct: pass the NUMA node to dma_direct_alloc()
  iommu/dma: pass the NUMA node to iommu_dma_alloc()
  dma-mapping: add dma_alloc_attrs_node() and dma_alloc_coherent_node()
  eth: libwx: restore the device's NUMA node after ring allocation
  eth: libwx: use dma_alloc_coherent_node()
  eth: ixgbe: use dma_alloc_coherent_node()
  eth: xgbe: use dma_alloc_coherent_node()
  eth: fungible: use dma_alloc_coherent_node()
  eth: mlx5: use dma_alloc_coherent_node()
  eth: mlx4: use dma_alloc_coherent_node()

 Documentation/core-api/dma-api.rst            | 15 ++++++++
 include/linux/dma-direct.h                    |  2 +-
 include/linux/dma-map-ops.h                   |  5 +--
 include/linux/dma-mapping.h                   | 14 ++++++++
 include/linux/iommu-dma.h                     |  2 +-
 include/linux/mlx4/device.h                   |  2 +-
 include/linux/mlx5/driver.h                   |  2 --
 arch/x86/kernel/amd_gart_64.c                 |  3 +-
 drivers/iommu/dma-iommu.c                     | 30 +++++++++-------
 drivers/net/ethernet/amd/xgbe/xgbe-desc.c     |  6 +---
 .../net/ethernet/fungible/funcore/fun_queue.c |  8 ++---
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 20 ++++-------
 drivers/net/ethernet/mellanox/mlx4/alloc.c    | 12 +++----
 drivers/net/ethernet/mellanox/mlx4/en_cq.c    |  9 ++---
 .../net/ethernet/mellanox/mlx4/en_netdev.c    |  2 +-
 drivers/net/ethernet/mellanox/mlx4/en_rx.c    |  5 ++-
 drivers/net/ethernet/mellanox/mlx4/en_tx.c    |  5 ++-
 .../net/ethernet/mellanox/mlx5/core/alloc.c   | 24 ++-----------
 .../net/ethernet/mellanox/mlx5/core/main.c    |  4 ---
 drivers/net/ethernet/wangxun/libwx/wx_lib.c   | 22 +++++-------
 kernel/dma/contiguous.c                       | 12 +++----
 kernel/dma/direct.c                           | 20 ++++++-----
 kernel/dma/mapping.c                          | 34 ++++++++++++++++---
 kernel/dma/ops_helpers.c                      |  5 +--
 24 files changed, 137 insertions(+), 126 deletions(-)

-- 
2.56.0