From: Daniel Borkmann <daniel@iogearbox•net>
To: David Miller <davem@davemloft•net>
Cc: ast@fb•com, holzheu@linux•vnet.ibm.com,
naveen.n.rao@linux•vnet.ibm.com, jakub.kicinski@netronome•com,
netdev@vger•kernel.org
Subject: Re: [PATCH net-next 1/9] bpf: add BPF_J{LT,LE,SLT,SLE} instructions
Date: Wed, 09 Aug 2017 19:00:58 +0200 [thread overview]
Message-ID: <598B3FCA.7060904@iogearbox.net> (raw)
In-Reply-To: <20170809.095553.268665355274669790.davem@davemloft.net>
On 08/09/2017 06:55 PM, David Miller wrote:
> From: Daniel Borkmann <daniel@iogearbox•net>
> Date: Wed, 9 Aug 2017 12:23:53 +0200
>
>> [1] https://github.com/borkmann/llvm/tree/bpf-insns
>
> How is this "backwards compatible"?
>
> If someone takes a new LLVM and tries to load those programs
> into an older kernel they will be rejected.
>
> There appears to be no effort to make things work cleanly in
> that situation at all.
No, that was just the patch I used for LLVM to enable the
insns, so not the final one that will be submitted there
officially where we have a switch to enable/disable this
functionality.
next prev parent reply other threads:[~2017-08-09 17:01 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-09 10:23 [PATCH net-next 0/9] Add BPF_J{LT,LE,SLT,SLE} instructions Daniel Borkmann
2017-08-09 10:23 ` [PATCH net-next 1/9] bpf: add " Daniel Borkmann
2017-08-09 16:55 ` David Miller
2017-08-09 17:00 ` Daniel Borkmann [this message]
2017-08-09 17:03 ` Daniel Borkmann
2017-08-09 18:01 ` David Miller
2017-08-09 20:32 ` Daniel Borkmann
2017-08-09 21:26 ` David Miller
2017-08-09 21:29 ` Daniel Borkmann
2017-08-09 10:23 ` [PATCH net-next 2/9] bpf, x86: implement jiting of BPF_J{LT,LE,SLT,SLE} Daniel Borkmann
2017-08-09 10:23 ` [PATCH net-next 3/9] bpf, arm64: " Daniel Borkmann
2017-08-09 10:23 ` [PATCH net-next 4/9] bpf, sparc64: " Daniel Borkmann
2017-08-09 10:23 ` [PATCH net-next 5/9] bpf, s390x: " Daniel Borkmann
2017-08-09 10:23 ` [PATCH net-next 6/9] bpf, ppc64: " Daniel Borkmann
2017-08-09 10:23 ` [PATCH net-next 7/9] bpf, nfp: implement jiting of BPF_J{LT,LE} Daniel Borkmann
2017-08-09 10:24 ` [PATCH net-next 8/9] bpf: enable BPF_J{LT,LE,SLT,SLE} opcodes in verifier Daniel Borkmann
2017-08-09 10:24 ` [PATCH net-next 9/9] bpf: add test cases for new BPF_J{LT,LE,SLT,SLE} instructions Daniel Borkmann
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