netdev - Re: [PATCH 1/2] bpf: support access variable length array of integer type

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Date:   Mon, 17 Apr 2023 17:08:33 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Feng zhou <zhoufeng.zf@...edance.com>
Cc:     martin.lau@...ux.dev, ast@...nel.org, daniel@...earbox.net,
        andrii@...nel.org, song@...nel.org, yhs@...com,
        john.fastabend@...il.com, kpsingh@...nel.org, sdf@...gle.com,
        haoluo@...gle.com, jolsa@...nel.org, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        mykolal@...com, shuah@...nel.org, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        linux-kselftest@...r.kernel.org, yangzhenze@...edance.com,
        wangdongdong.6@...edance.com, zhouchengming@...edance.com
Subject: Re: [PATCH 1/2] bpf: support access variable length array of integer
 type

On Mon, Apr 17, 2023 at 04:07:48PM +0800, Feng zhou wrote:
> From: Feng Zhou <zhoufeng.zf@...edance.com>
> 
> After this commit:
> bpf: Support variable length array in tracing programs (9c5f8a1008a1)
> Trace programs can access variable length array, but for structure
> type. This patch adds support for integer type.
> 
> Example:
> Hook load_balance
> struct sched_domain {
> 	...
> 	unsigned long span[];
> }
> 
> The access: sd->span[0].

The use case makes sense.
Please add it as a selftest. Either combine it with patch 2 or another patch 3.
and then resubmit.
Make sure to use [PATCH bpf-next] subject, so BPF CI knows how to test it.