nfp: bpf: record jump destination to simplify jump fixup

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eBPF insns are internally organized as dual-list inside NFP offload JIT.
Random access to an insn needs to be done by either forward or backward
traversal along the list.

One place we need to do such traversal is at nfp_fixup_branches where one
traversal is needed for each jump insn to find the destination. Such
traversals could be avoided if jump destinations are collected through a
single travesal in a pre-scan pass, and such information could also be
useful in other places where jump destination info are needed.

This patch adds such jump destination collection in nfp_prog_prepare.

Suggested-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Jiong Wang <jiong.wang@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

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This commit is contained in:

Jiong Wang 2017-11-30 21:32:50 -08:00 • committed by Daniel Borkmann

parent 854dc87d1a

commit 5b674140ad

4 changed files with 41 additions and 55 deletions

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57

drivers/net/ethernet/netronome/nfp/bpf/jit.c

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13

drivers/net/ethernet/netronome/nfp/bpf/main.h

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22

drivers/net/ethernet/netronome/nfp/bpf/offload.c

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4

drivers/net/ethernet/netronome/nfp/bpf/verifier.c

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