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Date: Tue, 19 Mar 2024 16:43:27 +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@...ngson.cn, linux@...linux.org.uk, guyinggang@...ngson.cn,
netdev@...r.kernel.org, chris.chenfeiyang@...il.com
Subject: Re: [PATCH net-next v8 04/11] net: stmmac: dwmac-loongson: Move irq
config to loongson_gmac_config
On Wed, Mar 13, 2024 at 04:14:28PM +0800, Yanteng Si wrote:
>
> 在 2024/2/6 01:01, Serge Semin 写道:
> > On Tue, Jan 30, 2024 at 04:43:24PM +0800, Yanteng Si wrote:
> > > Add loongson_dwmac_config and moving irq config related
> > > code to loongson_dwmac_config.
> > >
> > > Removing MSI to prepare for adding loongson multi-channel
> > > support later.
> > Please detach this change into a separate patch and thoroughly explain
> > why it was necessary.
> OK.
> >
> > > Signed-off-by: Yanteng Si <siyanteng@...ngson.cn>
> > > Signed-off-by: Feiyang Chen <chenfeiyang@...ngson.cn>
> > > Signed-off-by: Yinggang Gu <guyinggang@...ngson.cn>
> > > ---
> > > .../ethernet/stmicro/stmmac/dwmac-loongson.c | 85 ++++++++++++-------
> > > 1 file changed, 55 insertions(+), 30 deletions(-)
> > >
> > > diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
> > > index 979c9b6dab3f..e7ce027cc14e 100644
> > > --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
> > > +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
> > > @@ -11,8 +11,46 @@
> > > struct stmmac_pci_info {
> > > int (*setup)(struct pci_dev *pdev, struct plat_stmmacenet_data *plat);
> > > + int (*config)(struct pci_dev *pdev, struct plat_stmmacenet_data *plat,
> > > + struct stmmac_resources *res, struct device_node *np);
> > > };
> > > +static int loongson_dwmac_config_legacy(struct pci_dev *pdev,
> > > + struct plat_stmmacenet_data *plat,
> > > + struct stmmac_resources *res,
> > > + struct device_node *np)
> > > +{
> > > + if (np) {
> > > + res->irq = of_irq_get_byname(np, "macirq");
> > > + if (res->irq < 0) {
> > > + dev_err(&pdev->dev, "IRQ macirq not found\n");
> > > + return -ENODEV;
> > > + }
> > > +
> > > + res->wol_irq = of_irq_get_byname(np, "eth_wake_irq");
> > > + if (res->wol_irq < 0) {
> > > + dev_info(&pdev->dev,
> > > + "IRQ eth_wake_irq not found, using macirq\n");
> > > + res->wol_irq = res->irq;
> > > + }
> > > +
> > > + res->lpi_irq = of_irq_get_byname(np, "eth_lpi");
> > > + if (res->lpi_irq < 0) {
> > > + dev_err(&pdev->dev, "IRQ eth_lpi not found\n");
> > > + return -ENODEV;
> > > + }
> > > + } else {
> > > + res->irq = pdev->irq;
> > > + res->wol_irq = res->irq;
> > > + }
> > > +
> > > + plat->flags &= ~STMMAC_FLAG_MULTI_MSI_EN;
> > > + dev_info(&pdev->dev, "%s: Single IRQ enablement successful\n",
> > > + __func__);
> > Why is this here all of the sudden? I don't see this in the original
> > code. Please move it to the patch which requires the flag
> > setup/cleanup or drop if it isn't necessary.
>
> + plat->flags &= ~STMMAC_FLAG_MULTI_MSI_EN;
> This cannot be removed because it appeared in a rebase(v4 -> v5). See
> <https://lore.kernel.org/all/20230710090001.303225-9-brgl@bgdev.pl/>
AFAICS it _can_ be removed. The patch you referred to is a formal
conversion of
- plat->multi_msi_en = 0;
to
+ plat->flags &= ~STMMAC_FLAG_MULTI_MSI_EN;
First of all the "multi_msi_en" field clearance had been
redundant there since the code setting the flag was executed after the
code which may cause the field clearance performed. Second AFAICS the
"multi_msi_en" field clearance was originally added to emphasize the
functions semantics:
intel_eth_config_multi_msi() - config multi IRQ device,
intel_eth_config_single_msi() - config single IRQ device.
So in your case there is no any reason of clearing the
STMMAC_FLAG_MULTI_MSI_EN flag. Please, either drop it or move the
change into a separate patch.
-Serge(y)
> + dev_info(&pdev->dev, "%s: Single IRQ enablement successful\n",
> + __func__);
>
> OK, drop it.
>
> >
> > > +
> > > + return 0;
> > > +}
> > > +
> > > static void loongson_default_data(struct pci_dev *pdev,
> > > struct plat_stmmacenet_data *plat)
> > > {
> > > @@ -66,8 +104,21 @@ static int loongson_gmac_data(struct pci_dev *pdev,
> > > return 0;
> > > }
> > > +static int loongson_gmac_config(struct pci_dev *pdev,
> > > + struct plat_stmmacenet_data *plat,
> > > + struct stmmac_resources *res,
> > > + struct device_node *np)
> > > +{
> > > + int ret;
> > > +
> > > + ret = loongson_dwmac_config_legacy(pdev, plat, res, np);
> > > +
> > > + return ret;
> > > +}
> > > +
> > You introduce the config callback here and convert to a dummy method
> > in
> > [PATCH 07/11] net: stmmac: dwmac-loongson: Add multi-channel supports for loongson
> > It's just pointless. What about introducing the
> > loongson_dwmac_config_legacy() method and call it directly?
> OK, I will try.
> >
> > > static struct stmmac_pci_info loongson_gmac_pci_info = {
> > > .setup = loongson_gmac_data,
> > > + .config = loongson_gmac_config,
> > > };
> > > static int loongson_dwmac_probe(struct pci_dev *pdev,
> > > @@ -139,44 +190,19 @@ static int loongson_dwmac_probe(struct pci_dev *pdev,
> > > plat->phy_interface = phy_mode;
> > > }
> > > - pci_enable_msi(pdev);
> > See my first note in this message.
>
> OK.
>
>
> Thanks,
>
> Yanteng
>
> >
> > -Serge(y)
> >
> > > memset(&res, 0, sizeof(res));
> > > res.addr = pcim_iomap_table(pdev)[0];
> > > - if (np) {
> > > - res.irq = of_irq_get_byname(np, "macirq");
> > > - if (res.irq < 0) {
> > > - dev_err(&pdev->dev, "IRQ macirq not found\n");
> > > - ret = -ENODEV;
> > > - goto err_disable_msi;
> > > - }
> > > -
> > > - res.wol_irq = of_irq_get_byname(np, "eth_wake_irq");
> > > - if (res.wol_irq < 0) {
> > > - dev_info(&pdev->dev,
> > > - "IRQ eth_wake_irq not found, using macirq\n");
> > > - res.wol_irq = res.irq;
> > > - }
> > > -
> > > - res.lpi_irq = of_irq_get_byname(np, "eth_lpi");
> > > - if (res.lpi_irq < 0) {
> > > - dev_err(&pdev->dev, "IRQ eth_lpi not found\n");
> > > - ret = -ENODEV;
> > > - goto err_disable_msi;
> > > - }
> > > - } else {
> > > - res.irq = pdev->irq;
> > > - res.wol_irq = pdev->irq;
> > > - }
> > > + ret = info->config(pdev, plat, &res, np);
> > > + if (ret)
> > > + goto err_disable_device;
> > > 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:
> > > @@ -200,7 +226,6 @@ static void loongson_dwmac_remove(struct pci_dev *pdev)
> > > break;
> > > }
> > > - pci_disable_msi(pdev);
> > > pci_disable_device(pdev);
> > > }
> > > --
> > > 2.31.4
> > >
>
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