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tc: bpf: update list of archs with eBPF support in manpage 

Update the list of architectures supporting eBPF JIT as of Linux 4.18.
Also mention the Linux version where support for a particular
architecture was introduced. Finally, reformat the list of architectures
as a bullet list in order to make it more readable.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
This commit is contained in:
Tobias Klauser 2018-08-08 14:33:40 +02:00 committed by Stephen Hemminger
parent d56c7dde9d
commit b3b7c2a71b
1 changed files with 33 additions and 4 deletions
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37
man/man8/tc-bpf.8
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@ -79,10 +79,39 @@ In Linux, it's generally considered that eBPF is the successor of cBPF.
The kernel internally transforms cBPF expressions into eBPF expressions and The kernel internally transforms cBPF expressions into eBPF expressions and
executes the latter. Execution of them can be performed in an interpreter executes the latter. Execution of them can be performed in an interpreter
or at setup time, they can be just-in-time compiled (JIT'ed) to run as or at setup time, they can be just-in-time compiled (JIT'ed) to run as
native machine code. Currently, x86_64, ARM64, s390, ppc64 and sparc64 native machine code.
architectures have eBPF JIT support, whereas PPC, SPARC, ARM and MIPS have .PP
cBPF, but did not (yet) switch to eBPF JIT support. Currently, the eBPF JIT compiler is available for the following architectures:
.IP * 4
x86_64 (since Linux 3.18)
.PD 0
.IP *
arm64 (since Linux 3.18)
.IP *
s390 (since Linux 4.1)
.IP *
ppc64 (since Linux 4.8)
.IP *
sparc64 (since Linux 4.12)
.IP *
mips64 (since Linux 4.13)
.IP *
arm32 (since Linux 4.14)
.IP *
x86_32 (since Linux 4.18)
.PD
.PP
Whereas the following architectures have cBPF, but did not (yet) switch to eBPF
JIT support:
.IP * 4
ppc32
.PD 0
.IP *
sparc32
.IP *
mips32
.PD
.PP
eBPF's instruction set has similar underlying principles as the cBPF eBPF's instruction set has similar underlying principles as the cBPF
instruction set, it however is modelled closer to the underlying instruction set, it however is modelled closer to the underlying
architecture to better mimic native instruction sets with the aim to architecture to better mimic native instruction sets with the aim to