bpf: add devmap, a map for storing net device references

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Device map (devmap) is a BPF map, primarily useful for networking
applications, that uses a key to lookup a reference to a netdevice.

The map provides a clean way for BPF programs to build virtual port
to physical port maps. Additionally, it provides a scoping function
for the redirect action itself allowing multiple optimizations. Future
patches will leverage the map to provide batching at the XDP layer.

Another optimization/feature, that is not yet implemented, would be
to support multiple netdevices per key to support efficient multicast
and broadcast support.

Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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John Fastabend 2017-07-17 09:28:56 -07:00 • committed by David S. Miller

parent 5acaee0a89

commit 546ac1ffb7

6 changed files with 294 additions and 0 deletions

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3

include/linux/bpf_types.h

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1

include/uapi/linux/bpf.h

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3

kernel/bpf/Makefile

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264

kernel/bpf/devmap.c

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8

kernel/bpf/verifier.c

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15

tools/testing/selftests/bpf/test_maps.c

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