netdev - Re: [Intel-wired-lan] [PATCH 2/2] igc: wait for the MAC copy when enabled MAC passthrough

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Date:   Tue, 6 Jul 2021 14:46:55 +0800
From:   Aaron Ma <aaron.ma@...onical.com>
To:     "Neftin, Sasha" <sasha.neftin@...el.com>,
        jesse.brandeburg@...el.com, anthony.l.nguyen@...el.com,
        davem@...emloft.net, kuba@...nel.org,
        intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        "Edri, Michael" <michael.edri@...el.com>,
        "Ruinskiy, Dima" <dima.ruinskiy@...el.com>,
        "Shalev, Avi" <avi.shalev@...el.com>
Subject: Re: [Intel-wired-lan] [PATCH 2/2] igc: wait for the MAC copy when
 enabled MAC passthrough


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.

Thanks,
Aaron