linux-kernel - Re: [net-next, PATCH] net: stmmac: use correct define to get rx timestamp on GMAC4

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Date:   Thu, 14 Feb 2019 16:56:05 +0100
From:   Alexandre Torgue <alexandre.torgue@...com>
To:     Jose Abreu <jose.abreu@...opsys.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        <davem@...emloft.net>
CC:     <netdev@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [net-next, PATCH] net: stmmac: use correct define to get rx
 timestamp on GMAC4



On 2/14/19 4:30 PM, Jose Abreu wrote:
> On 2/14/2019 3:00 PM, Alexandre Torgue wrote:
>> Hi Jose
>>
>> On 2/14/19 3:18 PM, Jose Abreu wrote:
>>> Hi Alexandre,
>>>
>>> On 2/14/2019 2:12 PM, Alexandre Torgue wrote:
>>>> In dwmac4_wrback_get_rx_timestamp_status we looking for a RX
>>>> timestamp.
>>>> For that receive descriptors are handled and so we should use
>>>> defines
>>>> related to receive descriptors. It'll no change the functional
>>>> behavior
>>>> as RDES3_RDES1_VALID=TDES3_RS1V=BIT(26) but it makes code
>>>> easier to read.
>>>>
>>>> Signed-off-by: Alexandre Torgue <alexandre.torgue@...com>
>>>>
>>>> diff --git
>>>> a/drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c
>>>> b/drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c
>>>> index 20299f6..9f062b3 100644
>>>> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c
>>>> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c
>>>> @@ -268,7 +268,7 @@ static int
>>>> dwmac4_wrback_get_rx_timestamp_status(void *desc, void
>>>> *next_desc,
>>>>        int ret = -EINVAL;
>>>>          /* Get the status from normal w/b descriptor */
>>>> -    if (likely(p->des3 & TDES3_RS1V)) {
>>>> +    if (likely(p->des3 & RDES3_RDES1_VALID)) {
>>>
>>> Shouldn't this also use le32_to_cpu() like bellow ?
>>
>> I agree. I focused on cosmetic but yes you are right, we have to
>> take car about endianness as this IP is used by different
>> processors (using different endianness). I gonna send a v2.
>> I think dwmac4_rx_check_timestamp have the same kind of issue.
>> Another patch should be sent for it. no ?
> 
> Yeah. Maybe you can send all of that in this v2 patch also ?

I'll send another one separately, in order to have a correct commit 
header. I send it now.

> 
> Thanks,
> Jose Miguel Abreu
> 
>>
>> regards
>> Alex
>>
>>
>>
>>>
>>> Thanks,
>>> Jose Miguel Abreu
>>>
>>>>            if (likely(le32_to_cpu(p->des1) &
>>>> RDES1_TIMESTAMP_AVAILABLE)) {
>>>>                int i = 0;
>>>>