This patchset works towards supporting different XDP RX-ring memory
allocators.  As this will be needed by the AF_XDP zero-copy mode.

The patchset uses mlx5 as the sample driver, which gets implemented
XDP_REDIRECT RX-mode, but not ndo_xdp_xmit (as this API is subject to
change thought the patchset).

A new struct xdp_frame is introduced (modeled after cpumap xdp_pkt).
And both ndo_xdp_xmit and the new xdp_return_frame end-up using this.

Support for a driver supplied allocator is implemented, and a
refurbished version of page_pool is the first return allocator type
introduced.  This will be a integration point for AF_XDP zero-copy.

The mlx5 driver evolve into using the page_pool, and see a performance
increase (with ndo_xdp_xmit out ixgbe driver) from 6Mpps to 12Mpps.

The patchset stop at the 15 patches limit, but more API changes are
planned.  Specifically extending ndo_xdp_xmit and xdp_return_frame
APIs to support bulking.  As this will address some known limits.


Jesper Dangaard Brouer (15):
      mlx5: basic XDP_REDIRECT forward support
      xdp: introduce xdp_return_frame API and use in cpumap
      ixgbe: use xdp_return_frame API
      xdp: move struct xdp_buff from filter.h to xdp.h
      xdp: introduce a new xdp_frame type
      tun: convert to use generic xdp_frame and xdp_return_frame API
      virtio_net: convert to use generic xdp_frame and xdp_return_frame API
      bpf: cpumap convert to use generic xdp_frame
      mlx5: register a memory model when XDP is enabled
      xdp: rhashtable with allocator ID to pointer mapping
      page_pool: refurbish version of page_pool code
      xdp: allow page_pool as an allocator type in xdp_return_frame
      mlx5: use page_pool for xdp_return_frame call
      xdp: transition into using xdp_frame for return API
      xdp: transition into using xdp_frame for ndo_xdp_xmit

 drivers/net/ethernet/intel/ixgbe/ixgbe.h          |    3 
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c     |   37 ++
 drivers/net/ethernet/mellanox/mlx5/core/en.h      |    4 
 drivers/net/ethernet/mellanox/mlx5/core/en_main.c |   36 ++
 drivers/net/ethernet/mellanox/mlx5/core/en_rx.c   |   38 ++
 drivers/net/tun.c                                 |   42 +--
 drivers/net/virtio_net.c                          |   45 ++-
 drivers/vhost/net.c                               |    7 
 include/linux/filter.h                            |   24 --
 include/linux/if_tun.h                            |    4 
 include/linux/netdevice.h                         |    4 
 include/net/page_pool.h                           |  123 ++++++++
 include/net/xdp.h                                 |   86 +++++
 kernel/bpf/cpumap.c                               |  132 +++-----
 net/core/Makefile                                 |    1 
 net/core/filter.c                                 |   17 +
 net/core/page_pool.c                              |  334 +++++++++++++++++++++
 net/core/xdp.c                                    |  257 ++++++++++++++++
 18 files changed, 1022 insertions(+), 172 deletions(-)
 create mode 100644 include/net/page_pool.h
 create mode 100644 net/core/page_pool.c


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