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

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Date:   Thu, 14 Feb 2019 15:30:44 +0000
From:   Jose Abreu <jose.abreu@...opsys.com>
To:     Alexandre Torgue <alexandre.torgue@...com>,
        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 2/14/2019 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 ?

Thanks,
Jose Miguel Abreu

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