netdev - Re: [PATCH net-next 3/8] net: stmmac: move PTP interrupt handling to IP-specific DWMAC file

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Message-ID: <71492ab7-9d6b-e41c-e392-1bee04860f18@bootlin.com>
Date: Fri, 16 Jun 2023 15:48:44 +0200
From: Alexis Lothoré <alexis.lothore@...tlin.com>
To: Simon Horman <simon.horman@...igine.com>
Cc: Giuseppe Cavallaro <peppe.cavallaro@...com>,
 Alexandre Torgue <alexandre.torgue@...s.st.com>,
 Jose Abreu <joabreu@...opsys.com>, "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Maxime Coquelin
 <mcoquelin.stm32@...il.com>, Richard Cochran <richardcochran@...il.com>,
 linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org,
 linux-stm32@...md-mailman.stormreply.com,
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
 Nicolas Carrier <nicolas.carrier@...-timing.safrangroup.com>
Subject: Re: [PATCH net-next 3/8] net: stmmac: move PTP interrupt handling to
 IP-specific DWMAC file

Hello Simon,

On 6/16/23 15:34, Simon Horman wrote:
> On Fri, Jun 16, 2023 at 12:04:04PM +0200, alexis.lothore@...tlin.com wrote:
>> From: Alexis Lothoré <alexis.lothore@...tlin.com>
>>
>> As for auxiliary snapshot triggers configuration, reading snapshots depends
>> on specific registers addresses and layout. As a consequence, move
>> PTP-specific part of stmmac interrupt handling to specific DWMAC IP file
>>
>> Signed-off-by: Alexis Lothoré <alexis.lothore@...tlin.com>
> 
> Hi Alexis,
> 
> thanks for your patch.
> 
> ...
> 
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
>> index 01c0822d37e6..b36fbb0fa5da 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
>> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
> 
> ...
> 
>> +static void dwmac4_ptp_isr(struct stmmac_priv *priv)
>> +{
>> +	u32 num_snapshot, ts_status;
>> +	struct ptp_clock_event event;
>> +	unsigned long flags;
>> +	u64 ptp_time;
>> +	int i;
> 
> Please use reverse xmas tree - longest line to shortest - for new
> Networking code.
> 
> 	struct ptp_clock_event event;
> 	u32 num_snapshot, ts_status;
> 	unsigned long flags;
> 	u64 ptp_time;
> 	int i;
> 
ACK
> ...
> 
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.h b/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.h
>> index 9e0ff2cec352..92ed421702b9 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.h
>> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.h
>> @@ -23,9 +23,6 @@
>>  #define	PTP_STSUR	0x10	/* System Time – Seconds Update Reg */
>>  #define	PTP_STNSUR	0x14	/* System Time – Nanoseconds Update Reg */
>>  #define	PTP_TAR		0x18	/* Timestamp Addend Reg */
>> -#define	PTP_ACR		0x40	/* Auxiliary Control Reg */
> 
> Unfortunately this seems to break the build of
> drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
> on an x86_64 alllodconfig, as PTP_ACR is used in that file.
> 
>> -#define	PTP_ATNR	0x48	/* Auxiliary Timestamp - Nanoseconds Reg */
>> -#define	PTP_ATSR	0x4c	/* Auxiliary Timestamp - Seconds Reg */
>>  
>>  #define	PTP_STNSUR_ADDSUB_SHIFT	31
>>  #define	PTP_DIGITAL_ROLLOVER_MODE	0x3B9ACA00	/* 10e9-1 ns */

Ouch. thanks for spotting the issue and the providing build details, I'll fix
this and wait a bit for more comments before sending v2
> 
> --
> pw-bot: changes-requested
> 

-- 
Alexis Lothoré, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com