[PATCH net-next 00/20] netkit: Support for io_uring zero-copy and AF_XDP

[Daniel Borkmann <daniel@iogearbox.net>]

Containers use virtual netdevs to route traffic from a physical netdev
in the host namespace. They do not have access to the physical netdev
in the host and thus can't use memory providers or AF_XDP that require
reconfiguring/restarting queues in the physical netdev.

This patchset adds the concept of queue peering to virtual netdevs that
allow containers to use memory providers and AF_XDP at _native speed_!
These mapped queues are bound to a real queue in a physical netdev and
act as a proxy.

Memory providers and AF_XDP operations takes an ifindex and queue id,
so containers would pass in an ifindex for a virtual netdev and a queue
id of a mapped queue, which then gets proxied to the underlying real
queue. Peered queues are created and bound to a real queue atomically
through a generic ynl netdev operation.

We have implemented support for this concept in netkit and tested the
latter against Nvidia ConnectX-6 (mlx5) as well as Broadcom BCM957504
(bnxt_en) 100G NICs. For more details see the individual patches.

Daniel Borkmann (10):
  net: Add ndo_{peer,unpeer}_queues callback
  net, ethtool: Disallow mapped real rxqs to be resized
  xsk: Move NETDEV_XDP_ACT_ZC into generic header
  xsk: Move pool registration into single function
  xsk: Add small helper xp_pool_bindable
  xsk: Change xsk_rcv_check to check netdev/queue_id from pool
  xsk: Proxy pool management for mapped queues
  netkit: Add single device mode for netkit
  netkit: Document fast vs slowpath members via macros
  netkit: Add xsk support for af_xdp applications

David Wei (10):
  net, ynl: Add bind-queue operation
  net: Add peer to netdev_rx_queue
  net: Add ndo_queue_create callback
  net, ynl: Implement netdev_nl_bind_queue_doit
  net, ynl: Add peer info to queue-get response
  net: Proxy net_mp_{open,close}_rxq for mapped queues
  netkit: Implement rtnl_link_ops->alloc
  netkit: Implement ndo_queue_create
  netkit: Add io_uring zero-copy support for TCP
  tools, ynl: Add queue binding ynl sample application

 Documentation/netlink/specs/netdev.yaml |  54 ++++
 drivers/net/netkit.c                    | 362 ++++++++++++++++++++----
 include/linux/netdevice.h               |  15 +-
 include/net/netdev_queues.h             |   1 +
 include/net/netdev_rx_queue.h           |  55 ++++
 include/net/xdp_sock_drv.h              |   8 +-
 include/uapi/linux/if_link.h            |   6 +
 include/uapi/linux/netdev.h             |  20 ++
 net/core/netdev-genl-gen.c              |  14 +
 net/core/netdev-genl-gen.h              |   1 +
 net/core/netdev-genl.c                  | 144 +++++++++-
 net/core/netdev_rx_queue.c              |  15 +-
 net/ethtool/channels.c                  |  10 +-
 net/xdp/xsk.c                           |  27 +-
 net/xdp/xsk.h                           |   5 +-
 net/xdp/xsk_buff_pool.c                 |  29 +-
 tools/include/uapi/linux/netdev.h       |  20 ++
 tools/net/ynl/samples/bind.c            |  56 ++++
 18 files changed, 750 insertions(+), 92 deletions(-)
 create mode 100644 tools/net/ynl/samples/bind.c

-- 
2.43.0