linux-kernel - 回覆: 回覆: [net-next 3/3] net: ftgmac100: Support for AST2700

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Message-ID:
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Date: Thu, 14 Nov 2024 06:26:46 +0000
From: Jacky Chou <jacky_chou@...eedtech.com>
To: Andrew Lunn <andrew@...n.ch>
CC: "andrew+netdev@...n.ch" <andrew+netdev@...n.ch>, "davem@...emloft.net"
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Subject:
 回覆: 回覆: [net-next 3/3] net: ftgmac100: Support for AST2700

Hi Andrew,


> > > > -	map = le32_to_cpu(rxdes->rxdes3);
> > > > +	map = le32_to_cpu(rxdes->rxdes3) | ((rxdes->rxdes2 &
> > > > +FTGMAC100_RXDES2_RXBUF_BADR_HI) << 16);
> > >
> > > Is this safe? You have to assume older generation of devices will
> > > return 42 in rxdes3, since it is not used by the hardware.
> >
> > Why does it need to return 42 in rxdes3?
> > The packet buffer address of the RX descriptor is used in both software and
> hardware.
> 
> 42 is just a random value. The point is, what do older generation of devices
> return here? Some random value? Something well defined?
> 
> You basically need to convince us that you are not breaking older systems by
> accessing registers which they do not have. Describe in the commit message
> how you know this is safe, what testing you have done etc.

Thanks for your kind reminder.
I will commit more detail information in next version.

Thanks,
Jacky