@pengutronix.de
> Subject: Re: [PATCH 3/3] net: fec: align IP header in hardware
>
> Thanks for the feedback David,
>
> On 09/29/2016 04:07 AM, David Laight wrote:
> > From: Eric Nelson
> >> Sent: 28 September 2016 18:15
> >> On 09/28/2016 09:42 AM, David
Hi Russell,
On 10/01/2016 09:52 PM, Russell King - ARM Linux wrote:
> On Fri, Sep 30, 2016 at 07:16:12AM -0700, Eric Nelson wrote:
>> On ARM, the CPU can't handle misaligned memory cycles without
>> taking an alignment fault and NET_IP_ALIGN is set to 2.
>
> Let's get this right... With Linux on
From: Russell King - ARM Linux
> Sent: 01 October 2016 20:52
> On Fri, Sep 30, 2016 at 07:16:12AM -0700, Eric Nelson wrote:
> > On ARM, the CPU can't handle misaligned memory cycles without
> > taking an alignment fault and NET_IP_ALIGN is set to 2.
>
> Let's get this right... With Linux on MMU p
On Fri, Sep 30, 2016 at 07:16:12AM -0700, Eric Nelson wrote:
> On ARM, the CPU can't handle misaligned memory cycles without
> taking an alignment fault and NET_IP_ALIGN is set to 2.
Let's get this right... With Linux on MMU parts:
On ARMv6+, unaligned memory cycles using the LDR, LDRH and corre
Hi David,
On 09/30/2016 06:49 AM, David Laight wrote:
> From: Eric Nelson
>> Sent: 30 September 2016 14:27
>> Thanks for the feedback David,
>>
>> On 09/29/2016 04:07 AM, David Laight wrote:
>>> From: Eric Nelson
Sent: 28 September 2016 18:15
On 09/28/2016 09:42 AM, David Laight wrote:
>
From: Eric Nelson
> Sent: 30 September 2016 14:27
> Thanks for the feedback David,
>
> On 09/29/2016 04:07 AM, David Laight wrote:
> > From: Eric Nelson
> >> Sent: 28 September 2016 18:15
> >> On 09/28/2016 09:42 AM, David Laight wrote:
> >>> From: Eric Nelson
> Sent: 26 September 2016 19:40
Thanks for the feedback David,
On 09/29/2016 04:07 AM, David Laight wrote:
> From: Eric Nelson
>> Sent: 28 September 2016 18:15
>> On 09/28/2016 09:42 AM, David Laight wrote:
>>> From: Eric Nelson
Sent: 26 September 2016 19:40
Hi David,
On 09/26/2016 02:26 AM, David Laight wrot
From: Eric Nelson
> Sent: 28 September 2016 18:15
> On 09/28/2016 09:42 AM, David Laight wrote:
> > From: Eric Nelson
> >> Sent: 26 September 2016 19:40
> >> Hi David,
> >>
> >> On 09/26/2016 02:26 AM, David Laight wrote:
> >>> From: Eric Nelson
> Sent: 24 September 2016 15:42
> The FEC r
Thanks Russell,
On 09/28/2016 10:25 AM, Russell King - ARM Linux wrote:
> On Wed, Sep 28, 2016 at 10:14:52AM -0700, Eric Nelson wrote:
>> Thanks David,
>>
>> On 09/28/2016 09:42 AM, David Laight wrote:
>>> From reading this it seems that the effect of FEC_RACC_SHIFT16 is to
>>> add two bytes of 'j
On Wed, Sep 28, 2016 at 10:14:52AM -0700, Eric Nelson wrote:
> Thanks David,
>
> On 09/28/2016 09:42 AM, David Laight wrote:
> > From reading this it seems that the effect of FEC_RACC_SHIFT16 is to
> > add two bytes of 'junk' to the start of every receive frame.
>
> That's right. Two bytes of jun
Thanks David,
On 09/28/2016 09:42 AM, David Laight wrote:
> From: Eric Nelson
>> Sent: 26 September 2016 19:40
>> Hi David,
>>
>> On 09/26/2016 02:26 AM, David Laight wrote:
>>> From: Eric Nelson
Sent: 24 September 2016 15:42
The FEC receive accelerator (RACC) supports shifting the data
From: Eric Nelson
> Sent: 26 September 2016 19:40
> Hi David,
>
> On 09/26/2016 02:26 AM, David Laight wrote:
> > From: Eric Nelson
> >> Sent: 24 September 2016 15:42
> >> The FEC receive accelerator (RACC) supports shifting the data payload of
> >> received packets by 16-bits, which aligns the pa
Hi David,
On 09/26/2016 02:26 AM, David Laight wrote:
> From: Eric Nelson
>> Sent: 24 September 2016 15:42
>> The FEC receive accelerator (RACC) supports shifting the data payload of
>> received packets by 16-bits, which aligns the payload (IP header) on a
>> 4-byte boundary, which is, if not requ
From: Eric Nelson
> Sent: 24 September 2016 15:42
> The FEC receive accelerator (RACC) supports shifting the data payload of
> received packets by 16-bits, which aligns the payload (IP header) on a
> 4-byte boundary, which is, if not required, at least strongly suggested
> by the Linux networking l
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