Re: [PATCH net-next] net: dsa: tag_rtl4_a: Drop bit 9 from egress frames

On Thu, Sep 23, 2021 at 11:59:36PM +0200, Linus Walleij wrote:

On Wed, Sep 15, 2021 at 9:20 AM DENG Qingfang [off-list ref] wrote:

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On Mon, Sep 13, 2021 at 04:31:56PM +0200, Linus Walleij wrote:

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This drops the code setting bit 9 on egress frames on the
Realtek "type A" (RTL8366RB) frames.

FYI, on RTL8366S, bit 9 on egress frames is disable learning.

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This bit was set on ingress frames for unknown reason,

I think it could be the reason why the frame is forwarded to the CPU.

Hm I suspect it disable learning on RTL8366RB as well.

Suspicion based on what?

Do we have some use for that feature in DSA taggers?

Yes.