Commit e8cb0167 authored by Björn Töpel's avatar Björn Töpel Committed by Daniel Borkmann
Browse files

bpf, doc: add RISC-V JIT to BPF documentation 



Update Documentation/networking/filter.txt and
Documentation/sysctl/net.txt to mention RISC-V.

Signed-off-by: default avatarBjörn Töpel <bjorn.topel@gmail.com>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
parent 8a9e0aff

Documentation/networking/filter.txt

+9 −7
Original line number Original line Diff line number Diff line
@@ -464,10 +464,11 @@ breakpoints: 0 1 
JIT compiler

JIT compiler

------------

------------





The Linux kernel has a built-in BPF JIT compiler for x86_64, SPARC, PowerPC,

The Linux kernel has a built-in BPF JIT compiler for x86_64, SPARC,

ARM, ARM64, MIPS and s390 and can be enabled through CONFIG_BPF_JIT. The JIT

PowerPC, ARM, ARM64, MIPS, RISC-V and s390 and can be enabled through

compiler is transparently invoked for each attached filter from user space

CONFIG_BPF_JIT. The JIT compiler is transparently invoked for each

or for internal kernel users if it has been previously enabled by root:

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

  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

skb pointer). All constraints and restrictions from bpf_check_classic() apply

before a conversion to the new layout is being done behind the scenes!

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

Currently, the classic BPF format is being used for JITing on most

architectures, whereas x86-64, aarch64, s390x, powerpc64, sparc64, arm32 perform

32-bit architectures, whereas x86-64, aarch64, s390x, powerpc64,

JIT compilation from eBPF instruction set.

sparc64, arm32, riscv (RV64G) perform JIT compilation from eBPF

instruction set.





Some core changes of the new internal format:

Some core changes of the new internal format:

Documentation/sysctl/net.txt

+1 −0
Original line number Original line Diff line number Diff line
@@ -52,6 +52,7 @@ two flavors of JITs, the newer eBPF JIT currently supported on: 
  - sparc64

  - sparc64

  - mips64

  - mips64

  - s390x

  - s390x

  - riscv





And the older cBPF JIT supported on the following archs:

And the older cBPF JIT supported on the following archs:

  - mips

  - mips