netdev - Re: [PATCH bpf-next 3/3] bpf, doc: add RISC-V to filter.txt

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Date:   Mon, 4 Feb 2019 21:09:03 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     bjorn.topel@...il.com, linux-riscv@...ts.infradead.org,
        ast@...nel.org, netdev@...r.kernel.org
Cc:     palmer@...ive.com, hch@...radead.org
Subject: Re: [PATCH bpf-next 3/3] bpf, doc: add RISC-V to filter.txt

On 02/03/2019 12:51 PM, bjorn.topel@...il.com wrote:
> From: Björn Töpel <bjorn.topel@...il.com>
> 
> Update Documentation/networking/filter.txt to mention RISC-V.
> 
> Signed-off-by: Björn Töpel <bjorn.topel@...il.com>

Nit: in Documentation/sysctl/net.txt under bpf_jit_enable there is also
a concrete list of eBPF/cBPF JITs, would be good to add riscv64 there as
well.

>  Documentation/networking/filter.txt | 16 +++++++++-------
>  1 file changed, 9 insertions(+), 7 deletions(-)
> 
> diff --git a/Documentation/networking/filter.txt b/Documentation/networking/filter.txt
> index 01603bc2eff1..b5e060edfc38 100644
> --- a/Documentation/networking/filter.txt
> +++ b/Documentation/networking/filter.txt
> @@ -464,10 +464,11 @@ breakpoints: 0 1
>  JIT compiler
>  ------------
>  
> -The Linux kernel has a built-in BPF JIT compiler for x86_64, SPARC, PowerPC,
> -ARM, ARM64, MIPS and s390 and can be enabled through CONFIG_BPF_JIT. The JIT
> -compiler is transparently invoked for each attached filter from user space
> -or for internal kernel users if it has been previously enabled by root:
> +The Linux kernel has a built-in BPF JIT compiler for x86_64, SPARC,
> +PowerPC, ARM, ARM64, MIPS, RISC-V and s390 and can be enabled through
> +CONFIG_BPF_JIT. The JIT compiler is transparently invoked for each
> +attached filter from user space or for internal kernel users if it has
> +been previously enabled by root:
>  
>    echo 1 > /proc/sys/net/core/bpf_jit_enable
>  
> @@ -603,9 +604,10 @@ got from bpf_prog_create(), and 'ctx' the given context (e.g.
>  skb pointer). All constraints and restrictions from bpf_check_classic() apply
>  before a conversion to the new layout is being done behind the scenes!
>  
> -Currently, the classic BPF format is being used for JITing on most 32-bit
> -architectures, whereas x86-64, aarch64, s390x, powerpc64, sparc64, arm32 perform
> -JIT compilation from eBPF instruction set.
> +Currently, the classic BPF format is being used for JITing on most
> +32-bit architectures, whereas x86-64, aarch64, s390x, powerpc64,
> +sparc64, arm32, riscv (RV64G) perform JIT compilation from eBPF
> +instruction set.
>  
>  Some core changes of the new internal format:
>  
>