[PATCH v2] bpf: Update sysctl documentation to list all supported architectures

[PATCH v2] bpf: Update sysctl documentation to list all supported architectures

[Michael Ellerman]

The sysctl documentation states that the JIT is only available on
x86_64, which is no longer correct.

Update the list, and break it out to indicate which architectures
support the cBPF JIT (via HAVE_CBPF_JIT) or the eBPF JIT
(HAVE_EBPF_JIT).

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
---
 Documentation/sysctl/net.txt | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

v2: Split the list based on cBPF vs eBPF.

diff --git a/Documentation/sysctl/net.txt b/Documentation/sysctl/net.txt
index 14db18c970b1..b9c3c6078010 100644
--- a/Documentation/sysctl/net.txt
+++ b/Documentation/sysctl/net.txt
@@ -36,8 +36,23 @@ bpf_jit_enable
 --------------
 
 This enables Berkeley Packet Filter Just in Time compiler.
-Currently supported on x86_64 architecture, bpf_jit provides a framework
-to speed packet filtering, the one used by tcpdump/libpcap for example.
+
+There are two flavors of JIT, the new eBPF JIT supported on:
+  - x86_64
+  - arm64
+  - ppc64
+  - sparc64
+  - mips64
+
+And the older cBPF JIT supported on:
+  - arm
+  - mips
+  - ppc
+  - sparc
+
+The BPF JIT provides a framework to speed packet filtering, the one used by
+tcpdump/libpcap for example.
+
 Values :
 	0 - disable the JIT (default value)
 	1 - enable the JIT
-- 
2.7.4

Re: [PATCH v2] bpf: Update sysctl documentation to list all supported architectures

[Daniel Borkmann]

On 08/17/2017 12:30 PM, Michael Ellerman wrote:
> The sysctl documentation states that the JIT is only available on
> x86_64, which is no longer correct.
>
> Update the list, and break it out to indicate which architectures
> support the cBPF JIT (via HAVE_CBPF_JIT) or the eBPF JIT
> (HAVE_EBPF_JIT).
>
> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

The last paragraph speaking about tcpdump, I can take care of
later, also given the patch is about updating list of archs, so
lgtm, thanks!

Acked-by: Daniel Borkmann <daniel@iogearbox.net>

Re: [PATCH v2] bpf: Update sysctl documentation to list all supported architectures

[David Miller]

From: Michael Ellerman <mpe@ellerman.id.au>
Date: Thu, 17 Aug 2017 20:30:39 +1000

> The sysctl documentation states that the JIT is only available on
> x86_64, which is no longer correct.
> 
> Update the list, and break it out to indicate which architectures
> support the cBPF JIT (via HAVE_CBPF_JIT) or the eBPF JIT
> (HAVE_EBPF_JIT).
> 
> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

Applied, thanks Michael.

Re: [PATCH v2] bpf: Update sysctl documentation to list all supported architectures

[Michael Ellerman]

Daniel Borkmann <daniel@iogearbox.net> writes:

> On 08/17/2017 12:30 PM, Michael Ellerman wrote:
>> The sysctl documentation states that the JIT is only available on
>> x86_64, which is no longer correct.
>>
>> Update the list, and break it out to indicate which architectures
>> support the cBPF JIT (via HAVE_CBPF_JIT) or the eBPF JIT
>> (HAVE_EBPF_JIT).
>>
>> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
>
> The last paragraph speaking about tcpdump, I can take care of
> later, also given the patch is about updating list of archs, so
> lgtm, thanks!

Thanks.

cheers