BPF metadata for direct access

This work enables generic transfer of metadata from XDP into skb, meaning the packet has a flexible and programmable room for meta data, which can later be used by BPF to set various skb members when passing up the stack. For details, please see second patch. Support has been implemented and tested with two drivers, and should be straight forward to add to other drivers as well which properly support head adjustment already.

Thanks!

Daniel Borkmann (6):
bpf: rename bpf_compute_data_end into bpf_compute_data_pointers
bpf: add meta pointer for direct access
bpf: update bpf.h uapi header for tools
bpf: improve selftests and add tests for meta pointer bpf, nfp: add meta data support
bpf, ixgbe: add meta data support

 drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c      |   1 +
 drivers/net/ethernet/cavium/thunder/nicvf_main.c   |   1 +
 drivers/net/ethernet/intel/i40e/i40e_txrx.c        |   1 +
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c      |  29 ++-
 drivers/net/ethernet/mellanox/mlx4/en_rx.c         |   1 +
 drivers/net/ethernet/mellanox/mlx5/core/en_rx.c    |   1 +
 .../net/ethernet/netronome/nfp/nfp_net_common.c    |  39 ++--
 drivers/net/ethernet/qlogic/qede/qede_fp.c         |   1 +
 drivers/net/tun.c                                  |   1 +
 drivers/net/virtio_net.c                           |   2 +
 include/linux/bpf.h                                |   1 +
 include/linux/filter.h                             |  30 ++-
 include/linux/skbuff.h                             |  68 +++++-
 include/uapi/linux/bpf.h                           |  13 +-
 kernel/bpf/sockmap.c                               |   4 +-
 kernel/bpf/verifier.c                              | 114 +++++++---
 net/bpf/test_run.c                                 |   3 +-
 net/core/dev.c                                     |  31 ++-
 net/core/filter.c                                  |  91 +++++++-
 net/core/lwt_bpf.c                                 |   2 +-
 net/core/skbuff.c                                  |   2 +
 net/sched/act_bpf.c                                |   4 +-
 net/sched/cls_bpf.c                                |   4 +-
 tools/include/uapi/linux/bpf.h                     |  45 ++--
 tools/testing/selftests/bpf/Makefile               |  21 +-
 tools/testing/selftests/bpf/bpf_helpers.h          |   2 +
 tools/testing/selftests/bpf/test_verifier.c        | 247 +++++++++++++++++++++
 tools/testing/selftests/bpf/test_xdp_meta.c        |  53 +++++
 tools/testing/selftests/bpf/test_xdp_meta.sh       |  51 +++++
 29 files changed, 759 insertions(+), 104 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/test_xdp_meta.c
 create mode 100755 tools/testing/selftests/bpf/test_xdp_meta.sh

1.9.3