netdev - Re: [bpf PATCH 1/2] bpf: Document sockmap '-target bpf' requirement for PROG_TYPE_SK

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Message-ID: <20180423193510.2dm6ur34r6mvtjsv@ast-mbp>
Date:   Mon, 23 Apr 2018 13:35:11 -0600
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     John Fastabend <john.fastabend@...il.com>
Cc:     ast@...nel.org, daniel@...earbox.net, netdev@...r.kernel.org
Subject: Re: [bpf PATCH 1/2] bpf: Document sockmap '-target bpf' requirement
 for PROG_TYPE_SK_MSG

On Mon, Apr 23, 2018 at 12:11:02PM -0700, John Fastabend wrote:
> BPF_PROG_TYPE_SK_MSG programs use a 'void *' for both data and the
> data_end pointers. Additionally, the verifier ensures that every
> accesses into the values is a __u64 read. This correctly maps on
> to the BPF 64-bit architecture.
> 
> However, to ensure that when building on 32bit architectures that
> clang uses correct types the '-target bpf' option _must_ be
> specified. To make this clear add a note to the Documentation.
> 
> Signed-off-by: John Fastabend <john.fastabend@...il.com>

Acked-by: Alexei Starovoitov <ast@...nel.org>