linux-kernel - Re: [PATCH net 1/2] r8152: fix the sw rx checksum is unavailable

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Date:   Thu, 24 Nov 2016 13:49:48 -0500
From:   Mark Lord <mlord@...ox.com>
To:     David Miller <davem@...emloft.net>
Cc:     hayeswang@...ltek.com, netdev@...r.kernel.org,
        nic_swsd@...ltek.com, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org
Subject: Re: [PATCH net 1/2] r8152: fix the sw rx checksum is unavailable

On 16-11-24 01:34 PM, Mark Lord wrote:
>>From tracing through the powerpc arch code, this is the buffer that
> is being directly DMA'd into.  And the USB layer does an invalidate_dcache
> on that entire buffer before initiating the DMA (confirmed via printk).

Slight correction:  the invalidate_dcache_range() is only done when
using kmalloc'd buffers.  I have converted the driver here
to use usb_alloc_coherent() instead, so that now gets skipped
since the memory is never cached.