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* [PATCH RFC bpf-next 0/2] bpf: Rework bpf_redirect_neigh() to allow supplying nexthop from caller
@ 2020-10-15 15:46 Toke Høiland-Jørgensen
  2020-10-15 15:46 ` [PATCH RFC bpf-next 1/2] bpf_redirect_neigh: Support supplying the nexthop as a helper parameter Toke Høiland-Jørgensen
  2020-10-15 15:46 ` [PATCH RFC bpf-next 2/2] selftests: Update test_tc_neigh to use the modified bpf_redirect_neigh() Toke Høiland-Jørgensen
  0 siblings, 2 replies; 12+ messages in thread
From: Toke Høiland-Jørgensen @ 2020-10-15 15:46 UTC (permalink / raw)
  To: Daniel Borkmann; +Cc: David Ahern, netdev, bpf

Based on previous discussion[0], we determined that it would be beneficial to
rework bpf_redirect_neigh() so the caller can supply the nexthop information
(e.g., from a previous call to bpf_fib_lookup()). This way, the two helpers can
be combined without incurring a second FIB lookup to find the nexthop, and
bpf_fib_lookup() becomes usable even if no nexthop entry currently exists.

This patch (and accompanying selftest update) accomplishes this by way of an
optional paramter to bpf_redirect_neigh(). This is an API change, and so should
really be merged into the bpf tree to be part of the 5.10 cycle; however, since
bpf-next has not yet been merged into bpf, I'm sending this as an RFC against
bpf-next for discussion, and will repost against bpf once that merge happens
(Daniel, unless you have a better way of doing this, of course).

-Toke

[0] https://lore.kernel.org/bpf/393e17fc-d187-3a8d-2f0d-a627c7c63fca@iogearbox.net/

---

Toke Høiland-Jørgensen (2):
      bpf_redirect_neigh: Support supplying the nexthop as a helper parameter
      selftests: Update test_tc_neigh to use the modified bpf_redirect_neigh()


 .../selftests/bpf/progs/test_tc_neigh.c       | 83 ++++++++++++++++---
 .../testing/selftests/bpf/test_tc_redirect.sh |  8 +-
 2 files changed, 78 insertions(+), 13 deletions(-)


^ permalink raw reply	[flat|nested] 12+ messages in thread

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Thread overview: 12+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-10-15 15:46 [PATCH RFC bpf-next 0/2] bpf: Rework bpf_redirect_neigh() to allow supplying nexthop from caller Toke Høiland-Jørgensen
2020-10-15 15:46 ` [PATCH RFC bpf-next 1/2] bpf_redirect_neigh: Support supplying the nexthop as a helper parameter Toke Høiland-Jørgensen
2020-10-15 16:27   ` David Ahern
2020-10-15 19:34     ` Toke Høiland-Jørgensen
2020-10-19 13:09       ` Daniel Borkmann
2020-10-19 13:28         ` Toke Høiland-Jørgensen
2020-10-19 14:48   ` Daniel Borkmann
2020-10-19 14:56     ` Toke Høiland-Jørgensen
2020-10-19 15:01   ` Daniel Borkmann
2020-10-15 15:46 ` [PATCH RFC bpf-next 2/2] selftests: Update test_tc_neigh to use the modified bpf_redirect_neigh() Toke Høiland-Jørgensen
2020-10-19 14:40   ` Daniel Borkmann
2020-10-19 14:48     ` Toke Høiland-Jørgensen

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