linux-kernel - Re: [PATCH v3 1/8] PCI/AER: Remove ID from aer_agent

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Date:   Mon, 4 Oct 2021 15:22:25 -0600
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Naveen Naidu <naveennaidu479@...il.com>, bhelgaas@...gle.com,
        ruscur@...sell.cc, oohall@...il.com
Cc:     linux-kernel-mentees@...ts.linuxfoundation.org,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH v3 1/8] PCI/AER: Remove ID from aer_agent_string[]

On 10/4/21 8:29 AM, Naveen Naidu wrote:
> Before 010caed4ccb6 ("PCI/AER: Decode Error Source RequesterID")
> the AER error logs looked like:
> 
>    pcieport 0000:00:03.0: AER: Corrected error received: id=0018
>    pcieport 0000:00:03.0: PCIe Bus Error: severity=Corrected, type=Data Link Layer, id=0018 (Receiver ID)
>    pcieport 0000:00:03.0:   device [1b36:000c] error status/mask=00000040/0000e000
>    pcieport 0000:00:03.0:    [ 6] BadTLP
> 
> In 010caed4ccb6 ("PCI/AER: Decode Error Source Requester ID"),
> the "id" field was removed from the AER error logs, so currently AER
> logs look like:
> 
>    pcieport 0000:00:03.0: AER: Corrected error received: 0000:00:03:0
>    pcieport 0000:00:03.0: PCIe Bus Error: severity=Corrected, type=Data Link Layer, (Receiver ID)
>    pcieport 0000:00:03.0:   device [1b36:000c] error status/mask=00000040/0000e000
>    pcieport 0000:00:03.0:    [ 6] BadTLP
> 
> The second line in the above logs prints "(Receiver ID)", even when
> there is no "id" in the log line. This is confusing.
> 

Starting your commit log to say that message are confusing and then talk
about why will make it easier to understand why the change is needed.

> Remove the "ID" from the aer_agent_string[]. The error logs will
> look as follows (Sample from dummy error injected by aer-inject):
> 
>    pcieport 0000:00:03.0: AER: Corrected error received: 0000:00:03.0
>    pcieport 0000:00:03.0: PCIe Bus Error: severity=Corrected, type=Data Link Layer, (Receiver)
>    pcieport 0000:00:03.0:   device [1b36:000c] error status/mask=00000040/0000e000
>    pcieport 0000:00:03.0:    [ 6] BadTLP
> 

It is good to see before and after messages. However, it will be helpful
to know why this change is necessary. It isn't very clear why in this
commit log.

> Signed-off-by: Naveen Naidu <naveennaidu479@...il.com
> Signed-off-by: Naveen Naidu <naveennaidu479@...il.com>

Extra signed-off-by?

> ---
>   drivers/pci/pcie/aer.c | 10 +++++-----
>   1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
> index 9784fdcf3006..241ff361b43c 100644
> --- a/drivers/pci/pcie/aer.c
> +++ b/drivers/pci/pcie/aer.c
> @@ -516,10 +516,10 @@ static const char *aer_uncorrectable_error_string[] = {
>   };
>   
>   static const char *aer_agent_string[] = {
> -	"Receiver ID",
> -	"Requester ID",
> -	"Completer ID",
> -	"Transmitter ID"
> +	"Receiver",
> +	"Requester",
> +	"Completer",
> +	"Transmitter"
>   };
>   
>   #define aer_stats_dev_attr(name, stats_array, strings_array,		\
> @@ -703,7 +703,7 @@ void aer_print_error(struct pci_dev *dev, struct aer_err_info *info)
>   	const char *level;
>   
>   	if (!info->status) {
> -		pci_err(dev, "PCIe Bus Error: severity=%s, type=Inaccessible, (Unregistered Agent ID)\n",
> +		pci_err(dev, "PCIe Bus Error: severity=%s, type=Inaccessible, (Unregistered Agent)\n",
>   			aer_error_severity_string[info->severity]);
>   		goto out;
>   	}
> 

thanks,
-- Shuah