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SubjectRe: [Intel-wired-lan] [PATCH 2/2] igc: wait for the MAC copy when enabled MAC passthrough
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On 7/6/2021 09:46, Aaron Ma wrote:
>
> On 7/5/21 7:54 PM, Neftin, Sasha wrote:
>> Hello Aaron, Thanks to point me on this document. I see... This is
>> recommendation for Windows driver. Anyway, "delay" approach is
>> error-prone. We need rather ask for MNG FW confirmation (message) that
>> MAC address is copied.
>> Can we call (in case we know that MNG FW copied MAC address):
>> igc_rar_set (method from igc_mac.c), update the mac.addr and then
>> perform": memcpy(netdev->dev_addr, hw->mac.addr, netdev->addr_len);?
>
> Without delay, after igc_rar_set, the MAC address is all 0.
> The MAC addr is the from dock instead of MAC passthrough with the
> original driver.
I would to like suggest checking the following direction:
1. principal question: can we update the netdev device address after it
is already set during probe? I meant perform another:
memcpy(netdev->dev_addr, hw->mac.addr, netdev->addr_len) up to demand
2. We need to work with Intel's firmware engineer/group and define the
message/event: MAC addressis changed and should be updated.
As I know MNG FW updates shadow registers. Since shadow registers are
different from RAL/RAH registers - it could be a notification that the
MAC address changed. Let's check it.
>
> Thanks,
> Aaron

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