netdev - Re: [PATCH net-next v13 13/15] net: stmmac: dwmac-loongson: Drop pci_enable/disable

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Date: Mon, 1 Jul 2024 04:17:06 +0300
From: Serge Semin <fancer.lancer@...il.com>
To: Yanteng Si <siyanteng@...ngson.cn>
Cc: andrew@...n.ch, hkallweit1@...il.com, peppe.cavallaro@...com, 
	alexandre.torgue@...s.st.com, joabreu@...opsys.com, Jose.Abreu@...opsys.com, 
	chenhuacai@...nel.org, linux@...linux.org.uk, guyinggang@...ngson.cn, 
	netdev@...r.kernel.org, chris.chenfeiyang@...il.com, si.yanteng@...ux.dev
Subject: Re: [PATCH net-next v13 13/15] net: stmmac: dwmac-loongson: Drop
 pci_enable/disable_msi temporarily

> [PATCH net-next v13 13/15] net: stmmac: dwmac-loongson: Drop pci_enable/disable_msi temporarily

You don't drop the methods call "temporarily" but forever. So fix
the subject like this please:
[PATCH net-next v13 13/15] net: stmmac: dwmac-loongson: Drop pci_enable_msi/disable_msi methods call

I understand that you meant that the MSI IRQs support will be
added later in framework of another commit and for the multi-channel
device case. But mentioning that in a way you did makes the commit log
more confusing than better explaining the change.

On Wed, May 29, 2024 at 06:21:08PM +0800, Yanteng Si wrote:
> The LS2K2000 patch added later will alloc vectors, so let's
> remove pci_enable/disable_msi temporarily to prepare for later
> calls to pci_alloc_irq_vectors/pci_free_irq_vectors. This does
> not affect the work of gmac devices, as they actually use intx.

As I mentioned in v12 AFAICS the MSI IRQs haven't been utilized on the
Loongseon GMAC devices so far since the IRQ numbers have been retrieved
directly from device DT-node. That's what you should have mentioned in
the log. Like this:
"The Loongson GMAC driver currently doesn't utilize the MSI IRQs, but
retrieves the IRQs specified in the device DT-node. Let's drop the
direct pci_enable_msi()/pci_disable_msi() calls then as redundant."

If what I said was correct and MSIs enable wasn't required for the
platform IRQs to work, then please use the log and move this patch to
being submitted between
[PATCH net-next v13 04/15] net: stmmac: dwmac-loongson: Drop duplicated hash-based filter size init
and
[PATCH net-next v13 05/15] net: stmmac: dwmac-loongson: Use PCI_DEVICE_DATA() macro for device identification

so the redundant pci_enable_msi()/pci_disable_msi() code wouldn't be
getting on a way of the subsequent preparation changes.

I'll get back to reviewing the rest of the patches tomorrow. That new
LS2K2000 + LS GMAC info made things much harder to comprehend than I
thought. But I think I finally managed to come up with what should be
done with the commit logs and the changes, to make it being taken into
account.

-Serge(y)

> 
> Signed-off-by: Feiyang Chen <chenfeiyang@...ngson.cn>
> Signed-off-by: Yinggang Gu <guyinggang@...ngson.cn>
> Signed-off-by: Yanteng Si <siyanteng@...ngson.cn>
> ---
>  drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c | 6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
> index fdd25ff33d02..45dcc35b7955 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
> @@ -167,7 +167,6 @@ static int loongson_dwmac_probe(struct pci_dev *pdev, const struct pci_device_id
>  		res.irq = pdev->irq;
>  	}
>  
> -	pci_enable_msi(pdev);
>  	memset(&res, 0, sizeof(res));
>  	res.addr = pcim_iomap_table(pdev)[0];
>  
> @@ -176,12 +175,10 @@ static int loongson_dwmac_probe(struct pci_dev *pdev, const struct pci_device_id
>  
>  	ret = stmmac_dvr_probe(&pdev->dev, plat, &res);
>  	if (ret)
> -		goto err_disable_msi;
> +		goto err_disable_device;
>  
>  	return ret;
>  
> -err_disable_msi:
> -	pci_disable_msi(pdev);
>  err_disable_device:
>  	pci_disable_device(pdev);
>  err_put_node:
> @@ -205,7 +202,6 @@ static void loongson_dwmac_remove(struct pci_dev *pdev)
>  		break;
>  	}
>  
> -	pci_disable_msi(pdev);
>  	pci_disable_device(pdev);
>  }
>  
> -- 
> 2.31.4
>