linux-kernel - Re: [PATCH net-next v3 10/10] net: stmmac: platform: support parsing per channel irq from DT

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Message-ID: <ZNUOn+QPK+N3yR+u@xhacker>
Date:   Fri, 11 Aug 2023 00:21:51 +0800
From:   Jisheng Zhang <jszhang@...nel.org>
To:     Alexandre TORGUE <alexandre.torgue@...s.st.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Jose Abreu <joabreu@...opsys.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH net-next v3 10/10] net: stmmac: platform: support parsing
 per channel irq from DT

On Fri, Aug 11, 2023 at 12:09:38AM +0800, Jisheng Zhang wrote:
> On Thu, Aug 10, 2023 at 04:57:00PM +0200, Alexandre TORGUE wrote:
> > On 8/9/23 18:50, Jisheng Zhang wrote:
> > > The snps dwmac IP may support per channel interrupt. Add support to
> > > parse the per channel irq from DT.
> > > 
> > > Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
> > > ---
> > >   .../net/ethernet/stmicro/stmmac/stmmac_main.c | 10 ++++----
> > >   .../ethernet/stmicro/stmmac/stmmac_platform.c | 23 +++++++++++++++++++
> > >   2 files changed, 29 insertions(+), 4 deletions(-)
> > > 
> > > diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> > > index 4ed5c976c7a3..245eeb7d3e83 100644
> > > --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> > > +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> > > @@ -3612,7 +3612,7 @@ static int stmmac_request_irq_multi(struct net_device *dev)
> > >   	for (i = 0; i < priv->plat->rx_queues_to_use; i++) {
> > >   		if (i >= MTL_MAX_RX_QUEUES)
> > >   			break;
> > > -		if (priv->rx_irq[i] == 0)
> > > +		if (priv->rx_irq[i] <= 0)
> > 
> > What do you fix here ?
> 
> No bug to fix, but adjust for parsing optional channel irqs from DT:
> rx_irq[i] and tx_irq[i] may come from platform_get_irq_byname_optional()
> so for !STMMAC_FLAG_PERCH_IRQ_EN platforms, they can be < 0. Before
> 

oops, I sent this email too quick before I complete it.

After this patch(parse optional channel irqs from DT), rx_irq[i] and
tx_irq[i] may come from platform_get_irq_byname_optional(),
so for STMMAC_FLAG_PERCH_IRQ_EN platforms which support less than
MTL_MAX_TX_QUEUES channels, for example 8 tx and 8 rx, the last
tx_irq[i] or rx_irq[i] can be < 0.

Thanks

> > >   			continue;
> > >   		int_name = priv->int_name_rx_irq[i];
> > > @@ -3637,7 +3637,7 @@ static int stmmac_request_irq_multi(struct net_device *dev)
> > >   	for (i = 0; i < priv->plat->tx_queues_to_use; i++) {
> > >   		if (i >= MTL_MAX_TX_QUEUES)
> > >   			break;
> > > -		if (priv->tx_irq[i] == 0)
> > > +		if (priv->tx_irq[i] <= 0)
> > 
> > same here
> > >   			continue;
> > >   		int_name = priv->int_name_tx_irq[i];
> > > @@ -7278,8 +7278,10 @@ int stmmac_dvr_probe(struct device *device,
> > >   	priv->plat = plat_dat;
> > >   	priv->ioaddr = res->addr;
> > >   	priv->dev->base_addr = (unsigned long)res->addr;
> > > -	priv->plat->dma_cfg->perch_irq_en =
> > > -		(priv->plat->flags & STMMAC_FLAG_PERCH_IRQ_EN);
> > > +	if (res->rx_irq[0] > 0 && res->tx_irq[0] > 0) {
> > > +		priv->plat->flags |= STMMAC_FLAG_PERCH_IRQ_EN;
> > > +		priv->plat->dma_cfg->perch_irq_en = true;
> > > +	}
> > >   	priv->dev->irq = res->irq;
> > >   	priv->wol_irq = res->wol_irq;
> > > diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> > > index 29145682b57b..9b46775b41ab 100644
> > > --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> > > +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> > > @@ -705,6 +705,9 @@ EXPORT_SYMBOL_GPL(stmmac_remove_config_dt);
> > >   int stmmac_get_platform_resources(struct platform_device *pdev,
> > >   				  struct stmmac_resources *stmmac_res)
> > >   {
> > > +	char irq_name[8];
> > > +	int i;
> > > +
> > >   	memset(stmmac_res, 0, sizeof(*stmmac_res));
> > >   	/* Get IRQ information early to have an ability to ask for deferred
> > > @@ -738,6 +741,26 @@ int stmmac_get_platform_resources(struct platform_device *pdev,
> > >   		dev_info(&pdev->dev, "IRQ eth_lpi not found\n");
> > >   	}
> > > +	for (i = 0; i < MTL_MAX_RX_QUEUES; i++) {
> > > +		snprintf(irq_name, sizeof(irq_name), "rx%i", i);
> > > +		stmmac_res->rx_irq[i] = platform_get_irq_byname_optional(pdev, irq_name);
> > > +		if (stmmac_res->rx_irq[i] < 0) {
> > > +			if (stmmac_res->rx_irq[i] == -EPROBE_DEFER)
> > > +				return -EPROBE_DEFER;
> > > +			break;
> > > +		}
> > > +	}
> > > +
> > > +	for (i = 0; i < MTL_MAX_TX_QUEUES; i++) {
> > > +		snprintf(irq_name, sizeof(irq_name), "tx%i", i);
> > > +		stmmac_res->tx_irq[i] = platform_get_irq_byname_optional(pdev, irq_name);
> > > +		if (stmmac_res->tx_irq[i] < 0) {
> > > +			if (stmmac_res->tx_irq[i] == -EPROBE_DEFER)
> > > +				return -EPROBE_DEFER;
> > > +			break;
> > > +		}
> > > +	}
> > > +
> > >   	stmmac_res->sfty_ce_irq = platform_get_irq_byname_optional(pdev, "sfty_ce");
> > >   	if (stmmac_res->sfty_ce_irq < 0) {
> > >   		if (stmmac_res->sfty_ce_irq == -EPROBE_DEFER)
> >