linux-kernel - Re: [Intel-wired-lan] [net-next PATCH 27/27] igb: Revert "igb: Revert support for build

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Date:   Wed, 26 Oct 2016 10:22:41 -0700
From:   Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:     Alexander Duyck <alexander.h.duyck@...el.com>,
        netdev@...r.kernel.org, intel-wired-lan@...ts.osuosl.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:     davem@...emloft.net, brouer@...hat.com
Subject: Re: [Intel-wired-lan] [net-next PATCH 27/27] igb: Revert "igb:
 Revert support for build_skb in igb"

On Tue, 2016-10-25 at 11:39 -0400, Alexander Duyck wrote:
> This reverts commit f9d40f6a9921 ("igb: Revert support for build_skb in
> igb") and adds a few changes to update it to work with the latest version
> of igb. We are now able to revert the removal of this due to the fact
> that with the recent changes to the page count and the use of
> DMA_ATTR_SKIP_CPU_SYNC we can make the pages writable so we should not be
> invalidating the additional data added when we call build_skb.
> 
> The biggest risk with this change is that we are now not able to support
> full jumbo frames when using build_skb.  Instead we can only support up
> to
> 2K minus the skb overhead and padding offset.
> 
> Signed-off-by: Alexander Duyck <alexander.h.duyck@...el.com>

Acked-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
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