On 2015-06-04 11:56, Markos Chandras wrote:

This commit introduces BPF ASM helpers for MIPS and MIPS64 kernels.
The purpose of this patch is to twofold:

1) We are now able to handle negative offsets instead of either
falling back to the interpreter or to simply not do anything and
bail out.

2) Optimize reads from the packet header instead of calling the C
helpers

Because of this patch, we are now able to get rid of quite a bit of
code in the JIT generation process by using MIPS optimized assembly
code. The new assembly code makes the test_bpf testsuite happy with
all 60 test passing successfully compared to the previous
implementation where 2 tests were failing.
Doing some basic analysis in the results between the old
implementation and the new one we can obtain the following
summary running current mainline on an ER8 board (+/- 30us delta is
ignored to prevent noise from kernel scheduling or IRQ latencies):

Summary: 22 tests are faster, 7 are slower and 47 saw no improvement

with the most notable improvement being the tcpdump tests. The 7 tests
that seem to be a bit slower is because they all follow the slow path
(bpf_internal_load_pointer_neg_helper) which is meant to be slow so
that's not a problem.

Cc: netdev@vger.kernel.org
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Alexei Starovoitov <redacted>
Cc: Daniel Borkmann <redacted>
Cc: Hannes Frederic Sowa <redacted>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Markos Chandras <redacted>
---
I have uploaded the script and the bpf result files in my LMO webspace
in case you want to have a look. I didn't paste them in here because they
are nearly 200 lines. Simply download all 3 files and run './bpf_analysis.py'

This patch relies on R2 instructions, and thus the Linux kernel fails to
build when targetting non-R2 CPUs. See for example:

https://buildd.debian.org/status/fetch.php?pkg=linux&arch=mipsel&ver=4.2%7Erc6-1%7Eexp1&stamp=1439480000

-- 
Aurelien Jarno                          GPG: 4096R/1DDD8C9B
aurelien@aurel32.net                 http://www.aurel32.net