netdev - Re: [PATCH bpf-next v3] bpf: increase supported cgroup storage value size

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Date:   Mon, 26 Jul 2021 17:33:51 -0700
From:   Martin KaFai Lau <kafai@...com>
To:     Stanislav Fomichev <sdf@...gle.com>
CC:     <netdev@...r.kernel.org>, <bpf@...r.kernel.org>, <ast@...nel.org>,
        <daniel@...earbox.net>, <andrii@...nel.org>,
        Yonghong Song <yhs@...com>
Subject: Re: [PATCH bpf-next v3] bpf: increase supported cgroup storage value
 size

On Mon, Jul 26, 2021 at 04:00:32PM -0700, Stanislav Fomichev wrote:
> Current max cgroup storage value size is 4k (PAGE_SIZE). The other local
> storages accept up to 64k (BPF_LOCAL_STORAGE_MAX_VALUE_SIZE). Let's align
> max cgroup value size with the other storages.
> 
> For percpu, the max is 32k (PCPU_MIN_UNIT_SIZE) because percpu
> allocator is not happy about larger values.
> 
> netcnt test is extended to exercise those maximum values
> (non-percpu max size is close to, but not real max).
> 
> v3:
> * refine SIZEOF_BPF_LOCAL_STORAGE_ELEM comment (Yonghong Song)
> * anonymous struct in percpu_net_cnt & net_cnt (Yonghong Song)
> * reorder free (Yonghong Song)
> 
> v2:
> * cap max_value_size instead of BUILD_BUG_ON (Martin KaFai Lau)
Acked-by: Martin KaFai Lau <kafai@...com>