[net-next V8 PATCH 00/16] XDP redirect memory return API

Jesper Dangaard Brouer
2018-03-31T12:05:49Z

This V8 is send against net-next, because i40e got XDP_REDIRECT
support in-between V6, and it doesn't exist in bpf-next yet. Most
significant change in this V8, is that page_pool only gets compiled
into the kernel when a drivers Kconfig 'select' the feature.

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 16 patches (one over 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.

V2: Updated according to Tariq's feedback
V3: Updated based on feedback from Jason Wang and Alex Duyck
V4: Updated based on feedback from Tariq and Jason
V5: Fix SPDX license, add Tariq's reviews, improve patch desc for perf test
V6: Updated based on feedback from Eric Dumazet and Alex Duyck
V7: Adapt to i40e that got XDP_REDIRECT support in-between
V8: Updated based on feedback kbuild test robot, and adjust for mlx5 changes

---

Jesper Dangaard Brouer (16):
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
i40e: convert to use generic xdp_frame and xdp_return_frame API
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/i40e/i40e_txrx.c | 33 ++
drivers/net/ethernet/intel/i40e/i40e_txrx.h | 3
drivers/net/ethernet/intel/ixgbe/ixgbe.h | 3
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 37 ++
drivers/net/ethernet/mellanox/mlx5/core/Kconfig | 1
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 | 42 ++-
drivers/net/tun.c | 60 ++--
drivers/net/virtio_net.c | 51 ++-
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 | 143 +++++++++
include/net/xdp.h | 83 +++++
kernel/bpf/cpumap.c | 132 +++------
net/Kconfig | 3
net/core/Makefile | 1
net/core/filter.c | 17 +
net/core/page_pool.c | 317 +++++++++++++++++++++
net/core/xdp.c | 269 ++++++++++++++++++
22 files changed, 1087 insertions(+), 187 deletions(-)
create mode 100644 include/net/page_pool.h
create mode 100644 net/core/page_pool.c