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Date: Wed, 3 Jan 2024 07:57:23 +0000
From: "Swee, Leong Ching" <leong.ching.swee@...el.com>
To: Serge Semin <fancer.lancer@...il.com>
CC: Maxime Coquelin <mcoquelin.stm32@...il.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>, Rob Herring
<robh+dt@...nel.org>, Krzysztof Kozlowski
<krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>,
Giuseppe Cavallaro <peppe.cavallaro@...com>,
"linux-stm32@...md-mailman.stormreply.com"
<linux-stm32@...md-mailman.stormreply.com>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org"
<linux-kernel@...r.kernel.org>, "netdev@...r.kernel.org"
<netdev@...r.kernel.org>, "devicetree@...r.kernel.org"
<devicetree@...r.kernel.org>, Teoh Ji Sheng <ji.sheng.teoh@...el.com>
Subject: RE: [PATCH net-next v1 3/4] net: stmmac: Add support for TX/RX
channel interrupt
> -----Original Message-----
> From: Serge Semin <fancer.lancer@...il.com>
> Sent: Saturday, December 23, 2023 5:49 AM
> To: Swee, Leong Ching <leong.ching.swee@...el.com>
> Cc: Maxime Coquelin <mcoquelin.stm32@...il.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>; Rob Herring <robh+dt@...nel.org>; Krzysztof
> Kozlowski <krzysztof.kozlowski+dt@...aro.org>; Conor Dooley
> <conor+dt@...nel.org>; Giuseppe Cavallaro <peppe.cavallaro@...com>;
> linux-stm32@...md-mailman.stormreply.com; linux-arm-
> kernel@...ts.infradead.org; linux-kernel@...r.kernel.org;
> netdev@...r.kernel.org; devicetree@...r.kernel.org; Teoh Ji Sheng
> <ji.sheng.teoh@...el.com>
> Subject: Re: [PATCH net-next v1 3/4] net: stmmac: Add support for TX/RX
> channel interrupt
>
> On Fri, Dec 22, 2023 at 01:44:50PM +0800, Leong Ching Swee wrote:
> > From: Swee Leong Ching <leong.ching.swee@...el.com>
> >
> > Enable TX/RX channel interrupt registration for MAC that interrupts
> > CPU through shared peripheral interrupt (SPI).
> >
> > Per channel interrupts and interrupt-names are registered through,
> > Eg: 4 tx and 4 rx channels:
> > interrupts = <GIC_SPI 100 IRQ_TYPE_LEVEL_HIGH>,
> > <GIC_SPI 101 IRQ_TYPE_LEVEL_HIGH>,
> > <GIC_SPI 102 IRQ_TYPE_LEVEL_HIGH>,
> > <GIC_SPI 103 IRQ_TYPE_LEVEL_HIGH>;
> > <GIC_SPI 104 IRQ_TYPE_LEVEL_HIGH>;
> > <GIC_SPI 105 IRQ_TYPE_LEVEL_HIGH>;
> > <GIC_SPI 106 IRQ_TYPE_LEVEL_HIGH>;
> > <GIC_SPI 107 IRQ_TYPE_LEVEL_HIGH>; interrupt-names =
> > "dma_tx0",
> > "dma_tx1",
> > "dma_tx2",
> > "dma_tx3",
> > "dma_rx0",
> > "dma_rx1",
> > "dma_rx2",
> > "dma_rx3";
> >
> > Signed-off-by: Teoh Ji Sheng <ji.sheng.teoh@...el.com>
> > Signed-off-by: Swee Leong Ching <leong.ching.swee@...el.com>
> > ---
> > .../ethernet/stmicro/stmmac/stmmac_platform.c | 24
> > +++++++++++++++++++
> > 1 file changed, 24 insertions(+)
> >
> > diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> > b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> > index 70eadc83ca68..f857907f13a0 100644
> > --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> > +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> > @@ -710,6 +710,8 @@
> EXPORT_SYMBOL_GPL(devm_stmmac_probe_config_dt);
> > int stmmac_get_platform_resources(struct platform_device *pdev,
> > struct stmmac_resources *stmmac_res) {
>
> > + char irq_name[8];
>
> By DW XGMAC v2.x IP-core design there can be up to 16 Tx channels and
> 12 Rx channels. Thus it's better to set irq_name size being at least
> (strlen("dma_tx16") + 1) == 9 beforehand since you are adding this code
> anyway and for some reason didn't consider to pick the Jisheng'
> patch up which fixed the MTL_MAX_TX_QUEUES/MTL_MAX_RX_QUEUES
> macros.
>
I only have 8 channels tx/rx dma irq setup, so I could not test 16 channels
Patch. Will update to 9 in v2.
> > + int i;
>
> Please add an empty line between the variables declaration and the next
> statement.
>
Thanks. Will update this in v2.
> > memset(stmmac_res, 0, sizeof(*stmmac_res));
> >
> > /* Get IRQ information early to have an ability to ask for deferred
> > @@ -719,6 +721,28 @@ int stmmac_get_platform_resources(struct
> platform_device *pdev,
> > if (stmmac_res->irq < 0)
> > return stmmac_res->irq;
> >
>
> > + /* For RX Channel */
> > + for (i = 0; i < MTL_MAX_RX_QUEUES; i++) {
> > + snprintf(irq_name, sizeof(irq_name), "dma_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;
> > + }
> > + }
>
> What about:
>
> + /* Get optional Tx/Rx DMA per-channel IRQs, which otherwise
> + * are supposed to be delivered via the common MAC IRQ line
> + */
> + for (i = 0; i < MTL_MAX_RX_QUEUES; i++) {
> + snprintf(irq_name, sizeof(irq_name), "dma_rx%i", i);
> + irq = platform_get_irq_byname_optional(pdev, irq_name);
> + if (irq == -EPROBE_DEFER)
> + return irq;
> + else if (irq < 0)
> + break;
> +
> + stmmac_res->rx_irq[i] = irq;
> + }
>
> It's cleaner a bit with less indentations and doesn't pollute rx_irq[]/tx_irq[]
> arrays with the error numbers.
>
Sure, will update this in v2.
> > +
> > + /* For TX Channel */
> > + for (i = 0; i < MTL_MAX_TX_QUEUES; i++) {
> > + snprintf(irq_name, sizeof(irq_name), "dma_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->rx_irq[i] == -EPROBE_DEFER)
> > + return -EPROBE_DEFER;
> > + break;
> > + }
> > + }
> > +
>
> Please move the Tx/Rx IRQs getting loops to the bottom of the
> stmmac_get_platform_resources() method. Thus the order of the IRQs
> getting would be the same as the order of the IRQs requests implemented in
> the stmmac_request_irq_multi_msi() and
> stmmac_request_irq_single() methods.
>
> -Serge(y)
>
Will move those methods to bottom in v2.
> > /* On some platforms e.g. SPEAr the wake up irq differs from the
> mac irq
> > * The external wake up irq can be passed through the platform code
> > * named as "eth_wake_irq"
> > --
> > 2.34.1
> >
> >
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