netdev - Re: [PATCH net-next 2/3] eth: platform: add a helper for loading netdev->dev

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Message-ID: <20211007065701.1ee88762@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Thu, 7 Oct 2021 06:57:01 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Michael Walle <michael@...le.cc>
Cc:     davem@...emloft.net, netdev@...r.kernel.org,
        vladimir.oltean@....com, andrew@...n.ch
Subject: Re: [PATCH net-next 2/3] eth: platform: add a helper for loading
 netdev->dev_addr

On Thu, 07 Oct 2021 15:42:17 +0200 Michael Walle wrote:
> > +int platform_get_ethdev_address(struct device *dev, struct net_device *netdev)
> > +{
> > +	u8 addr[ETH_ALEN];
> > +	int ret;
> > +
> > +	ret = eth_platform_get_mac_address(dev, addr);  
> 
> this eventually calls ether_addr_copy(), which has a note:
>    Please note: dst & src must both be aligned to u16.
> 
> Is this true for this addr on the stack?

It will but I don't think there's anything in the standard that
requires it. Let me slap __aligned(2) on it to be sure.