riscv, bpf: Add support for far branching

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This commit adds branch relaxation to the BPF JIT, and with that
support for far (offset greater than 12b) branching.

The branch relaxation requires more than two passes to converge. For
most programs it is three passes, but for larger programs it can be
more.

Signed-off-by: Björn Töpel <bjorn.topel@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Luke Nelson <lukenels@cs.washington.edu>
Link: https://lore.kernel.org/bpf/20191216091343.23260-3-bjorn.topel@gmail.com

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Björn Töpel 2019-12-16 10:13:36 +01:00 • committed by Daniel Borkmann

parent f1003b787c

commit 7d1ef13fea

1 changed files with 188 additions and 164 deletions

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arch/riscv/net/bpf_jit_comp.c

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