netdev - Re: [PATCH] net: nixge: Add __packed attribute to DMA descriptor struct

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Date:   Wed, 20 Jun 2018 14:44:36 +0900 (KST)
From:   David Miller <davem@...emloft.net>
To:     mdf@...nel.org
Cc:     keescook@...omium.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: nixge: Add __packed attribute to DMA descriptor
 struct

From: Moritz Fischer <mdf@...nel.org>
Date: Tue, 19 Jun 2018 09:54:53 -0700

> @@ -122,7 +122,7 @@ struct nixge_hw_dma_bd {
>  	u32 sw_id_offset;
>  	u32 reserved5;
>  	u32 reserved6;
> -};
> +} __packed;

As I understand it, based upon your replies to Florian, this bug doesn't
even show up with the current code.  The problem only happens with some
64-bit changes you are working on.

So, the change is not valid right now.

And for the 64-bit changes, I agree with Florian that you should adjust
your implementation so that this __packed dance isn't necessary and
that you can avoid some MMIOs as well.

Thanks.