netdev - Re: [net-next] net: stmmac: handle endianness in dwmac4_get

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Date:   Fri, 15 Feb 2019 10:09:14 +0100
From:   Alexandre Torgue <alexandre.torgue@...com>
To:     Florian Fainelli <f.fainelli@...il.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Jose Abreu <joabreu@...opsys.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] net: stmmac: handle endianness in dwmac4_get_timestamp



On 2/14/19 7:09 PM, Florian Fainelli wrote:
> On 2/14/19 9:26 AM, Alexandre Torgue wrote:
>> GMAC IP is little-endian and used on several kind of CPU (big or little
>> endian). Main callbacks functions of the stmmac drivers take care about
>> it. It was not the case for dwmac4_get_timestamp function.
> 
> This is clearly a bugfix, so you should be targeting the 'net' tree and
> provide a Fixes: tag so this can be backported to relevant stable kernels.
> 

Ok Florian, I just have to find the right commit to fix :)

>>
>> 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..736e296 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c
>> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c
>> @@ -241,15 +241,18 @@ static inline void dwmac4_get_timestamp(void *desc, u32 ats, u64 *ts)
>>   static int dwmac4_rx_check_timestamp(void *desc)
>>   {
>>   	struct dma_desc *p = (struct dma_desc *)desc;
>> +	unsigned int rdes0 = le32_to_cpu(p->des0);
>> +	unsigned int rdes1 = le32_to_cpu(p->des1);
>> +	unsigned int rdes3 = le32_to_cpu(p->des3);
>>   	u32 own, ctxt;
>>   	int ret = 1;
>>   
>> -	own = p->des3 & RDES3_OWN;
>> -	ctxt = ((p->des3 & RDES3_CONTEXT_DESCRIPTOR)
>> +	own = rdes3 & RDES3_OWN;
>> +	ctxt = ((rdes3 & RDES3_CONTEXT_DESCRIPTOR)
>>   		>> RDES3_CONTEXT_DESCRIPTOR_SHIFT);
>>   
>>   	if (likely(!own && ctxt)) {
>> -		if ((p->des0 == 0xffffffff) && (p->des1 == 0xffffffff))
>> +		if ((rdes0 == 0xffffffff) && (rdes1 == 0xffffffff))
>>   			/* Corrupted value */
>>   			ret = -EINVAL;
>>   		else
>>
> 
>