Re: [PATCH net-next v2 2/4] net: stmmac: Make MSI interrupt routine generic

From: Serge Semin
Date: Wed Jan 24 2024 - 09:55:01 EST

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On Wed, Jan 10, 2024 at 05:51:37AM +0000, Swee, Leong Ching wrote:
> > -----Original Message-----
> > From: Serge Semin <fancer.lancer@xxxxxxxxx>
> > Sent: Monday, January 8, 2024 4:28 AM
> > To: Swee, Leong Ching <leong.ching.swee@xxxxxxxxx>
> > Cc: Maxime Coquelin <mcoquelin.stm32@xxxxxxxxx>; Alexandre Torgue
> > <alexandre.torgue@xxxxxxxxxxx>; Jose Abreu <joabreu@xxxxxxxxxxxx>;
> > David S . Miller <davem@xxxxxxxxxxxxx>; Eric Dumazet
> > <edumazet@xxxxxxxxxx>; Jakub Kicinski <kuba@xxxxxxxxxx>; Paolo Abeni
> > <pabeni@xxxxxxxxxx>; Rob Herring <robh+dt@xxxxxxxxxx>; Krzysztof
> > Kozlowski <krzysztof.kozlowski+dt@xxxxxxxxxx>; Conor Dooley
> > <conor+dt@xxxxxxxxxx>; Giuseppe Cavallaro <peppe.cavallaro@xxxxxx>;
> > linux-stm32@xxxxxxxxxxxxxxxxxxxxxxxxxxxx; linux-arm-
> > kernel@xxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> > netdev@xxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx; Teoh Ji Sheng
> > <ji.sheng.teoh@xxxxxxxxx>
> > Subject: Re: [PATCH net-next v2 2/4] net: stmmac: Make MSI interrupt
> > routine generic
> >
> > On Fri, Jan 05, 2024 at 03:09:23PM +0800, Leong Ching Swee wrote:
> > > From: Swee Leong Ching <leong.ching.swee@xxxxxxxxx>
> > >
> > > There is no support for per DMA channel interrupt for non-MSI
> > > platform, where the MAC's per channel interrupt hooks up to interrupt
> > > controller(GIC) through shared peripheral interrupt(SPI) to handle
> > > interrupt from TX/RX transmit channel.
> > >
> > > This patch generalize the existing MSI ISR to also support non-MSI
> > > platform.
> >
> > Basically this patch just fixes the individual IRQ handling code names.
> >

> Will change the commit log to below, please check if it sounds ok?
>
> net: stmmac: Fixes individual IRQ handling code names
>
> Individual IRQ can also be used for non-MSI platform,
> today some of the code name for individual IRQ has
> msi naming, so change msi naming to irq to make it common
> for both platforms.

Much better but IMO the next wording would be a bit more descriptive:

net: stmmac: Generalize individual IRQs handling code names

The individual IRQs can be also available on the non-MSI platforms.
The respective code has been developed with the MSI-based platform in
mind thus having the "MSI" word in implementation entities. Drop such
wording or replace it with just "IRQ" where it's relevant in order to
generalize the individual IRQs handling code.

-Serge(y)

>
> > >
> > > Signed-off-by: Teoh Ji Sheng <ji.sheng.teoh@xxxxxxxxx>
> > > Signed-off-by: Swee Leong Ching <leong.ching.swee@xxxxxxxxx>
> > > ---
> > > .../net/ethernet/stmicro/stmmac/dwmac-intel.c | 4 +--
> > > .../ethernet/stmicro/stmmac/dwmac-socfpga.c | 3 ++
> > > .../net/ethernet/stmicro/stmmac/dwmac4_dma.c | 2 +-
> > > .../net/ethernet/stmicro/stmmac/stmmac_main.c | 30 +++++++++----------
> > > include/linux/stmmac.h | 4 +--
> > > 5 files changed, 23 insertions(+), 20 deletions(-)
> > >
> > > diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
> > > b/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
> > > index 60283543ffc8..f0ec69af96c9 100644
> > > --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
> > > +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
> > > @@ -952,7 +952,7 @@ static int stmmac_config_single_msi(struct pci_dev
> > > *pdev,
> > >
> > > res->irq = pci_irq_vector(pdev, 0);
> > > res->wol_irq = res->irq;
> > > - plat->flags &= ~STMMAC_FLAG_MULTI_MSI_EN;
> > > + plat->flags &= ~STMMAC_FLAG_MULTI_IRQ_EN;
> > > dev_info(&pdev->dev, "%s: Single IRQ enablement successful\n",
> > > __func__);
> > >
> > > @@ -1004,7 +1004,7 @@ static int stmmac_config_multi_msi(struct
> > pci_dev *pdev,
> > > if (plat->msi_sfty_ue_vec < STMMAC_MSI_VEC_MAX)
> > > res->sfty_ue_irq = pci_irq_vector(pdev, plat-
> > >msi_sfty_ue_vec);
> > >
> > > - plat->flags |= STMMAC_FLAG_MULTI_MSI_EN;
> > > + plat->flags |= STMMAC_FLAG_MULTI_IRQ_EN;
> > > dev_info(&pdev->dev, "%s: multi MSI enablement successful\n",
> > > __func__);
> > >
> > > return 0;
> > > diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c
> > > b/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c
> > > index ba2ce776bd4d..cf43fb3c6cc5 100644
> >
> > > --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c
> > > +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c
> > > @@ -427,6 +427,9 @@ static int socfpga_dwmac_probe(struct
> > platform_device *pdev)
> > > plat_dat->bsp_priv = dwmac;
> > > plat_dat->fix_mac_speed = socfpga_dwmac_fix_mac_speed;
> > >
> > > + if (stmmac_res.rx_irq[0] > 0 && stmmac_res.tx_irq[0] > 0)
> > > + plat_dat->flags |= STMMAC_FLAG_MULTI_IRQ_EN;
> > > +
> > > ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
> > > if (ret)
> > > return ret;
> >
> > This is unrelated change. It adds the individual DMA IRQs support for the SoC
> > FPGA platform, which AFAICS doesn't have it supported at the moment.
> > Please move this into a separate patch with the commit log describing the
> > change.
> >
> > > diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c
> > > b/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c
> > > index 84d3a8551b03..5f649106ffcd 100644
> > > --- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c
> > > +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c
> > > @@ -175,7 +175,7 @@ static void dwmac4_dma_init(void __iomem
> > *ioaddr,
> > >
> > > value = readl(ioaddr + DMA_BUS_MODE);
> > >
> > > - if (dma_cfg->multi_msi_en) {
> > > + if (dma_cfg->multi_irq_en) {
> > > value &= ~DMA_BUS_MODE_INTM_MASK;
> > > value |= (DMA_BUS_MODE_INTM_MODE1 <<
> > DMA_BUS_MODE_INTM_SHIFT);
> > > }
> > > diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> > > b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> > > index 47de466e432c..57873b879b33 100644
> > > --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> > > +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> > > @@ -129,8 +129,8 @@ static irqreturn_t stmmac_interrupt(int irq, void
> > > *dev_id);
> > > /* For MSI interrupts handling */
> > > static irqreturn_t stmmac_mac_interrupt(int irq, void *dev_id);
> > > static irqreturn_t stmmac_safety_interrupt(int irq, void *dev_id);
> > > -static irqreturn_t stmmac_msi_intr_tx(int irq, void *data); -static
> > > irqreturn_t stmmac_msi_intr_rx(int irq, void *data);
> > > +static irqreturn_t stmmac_dma_tx_interrupt(int irq, void *data);
> > > +static irqreturn_t stmmac_dma_rx_interrupt(int irq, void *data);
> > > static void stmmac_reset_rx_queue(struct stmmac_priv *priv, u32
> > > queue); static void stmmac_reset_tx_queue(struct stmmac_priv *priv,
> > > u32 queue); static void stmmac_reset_queues_param(struct stmmac_priv
> > > *priv); @@ -3602,7 +3602,7 @@ static void stmmac_free_irq(struct
> > net_device *dev,
> > > }
> > > }
> > >
> > > -static int stmmac_request_irq_multi_msi(struct net_device *dev)
> > > +static int stmmac_request_irq_multi(struct net_device *dev)
> > > {
> > > struct stmmac_priv *priv = netdev_priv(dev);
> > > enum request_irq_err irq_err;
> > > @@ -3697,7 +3697,7 @@ static int stmmac_request_irq_multi_msi(struct
> > net_device *dev)
> > > }
> > > }
> > >
> > > - /* Request Rx MSI irq */
> >
> > > + /* Request Rx irq */
> >
> > s/irq/IRQ
> > (capitalize)
> Sure, rework on v3.
> >
> > > for (i = 0; i < priv->plat->rx_queues_to_use; i++) {
> > > if (i >= MTL_MAX_RX_QUEUES)
> > > break;
> > > @@ -3707,11 +3707,11 @@ static int stmmac_request_irq_multi_msi(struct
> > net_device *dev)
> > > int_name = priv->int_name_rx_irq[i];
> > > sprintf(int_name, "%s:%s-%d", dev->name, "rx", i);
> > > ret = request_irq(priv->rx_irq[i],
> > > - stmmac_msi_intr_rx,
> > > + stmmac_dma_rx_interrupt,
> > > 0, int_name, &priv-
> > >dma_conf.rx_queue[i]);
> > > if (unlikely(ret < 0)) {
> > > netdev_err(priv->dev,
> > > - "%s: alloc rx-%d MSI %d (error: %d)\n",
> >
> > > + "%s: alloc rx-%d dma rx_irq %d (error:
> > %d)\n",
> >
> > s/ dma/DMA
> > (capitalize and drop extra space)
> >
> Thanks, rework on v3.
> > > __func__, i, priv->rx_irq[i], ret);
> > > irq_err = REQ_IRQ_ERR_RX;
> > > irq_idx = i;
> > > @@ -3722,7 +3722,7 @@ static int stmmac_request_irq_multi_msi(struct
> > net_device *dev)
> > > irq_set_affinity_hint(priv->rx_irq[i], &cpu_mask);
> > > }
> > >
> > > - /* Request Tx MSI irq */
> >
> > > + /* Request Tx irq */
> >
> > s/irq/IRQ
> >
> rework on v3.
> > > for (i = 0; i < priv->plat->tx_queues_to_use; i++) {
> > > if (i >= MTL_MAX_TX_QUEUES)
> > > break;
> > > @@ -3732,11 +3732,11 @@ static int stmmac_request_irq_multi_msi(struct
> > net_device *dev)
> > > int_name = priv->int_name_tx_irq[i];
> > > sprintf(int_name, "%s:%s-%d", dev->name, "tx", i);
> > > ret = request_irq(priv->tx_irq[i],
> > > - stmmac_msi_intr_tx,
> > > + stmmac_dma_tx_interrupt,
> > > 0, int_name, &priv-
> > >dma_conf.tx_queue[i]);
> > > if (unlikely(ret < 0)) {
> > > netdev_err(priv->dev,
> > > - "%s: alloc tx-%d MSI %d (error: %d)\n",
> >
> > > + "%s: alloc tx-%d dma tx_irq %d (error:
> > %d)\n",
> >
> > s/ dma/DMA
> >
> > -Serge(y)
> >
> rework on v3.
> > > __func__, i, priv->tx_irq[i], ret);
> > > irq_err = REQ_IRQ_ERR_TX;
> > > irq_idx = i;
> > > @@ -3811,8 +3811,8 @@ static int stmmac_request_irq(struct net_device
> > *dev)
> > > int ret;
> > >
> > > /* Request the IRQ lines */
> > > - if (priv->plat->flags & STMMAC_FLAG_MULTI_MSI_EN)
> > > - ret = stmmac_request_irq_multi_msi(dev);
> > > + if (priv->plat->flags & STMMAC_FLAG_MULTI_IRQ_EN)
> > > + ret = stmmac_request_irq_multi(dev);
> > > else
> > > ret = stmmac_request_irq_single(dev);
> > >
> > > @@ -6075,7 +6075,7 @@ static irqreturn_t stmmac_safety_interrupt(int
> > irq, void *dev_id)
> > > return IRQ_HANDLED;
> > > }
> > >
> > > -static irqreturn_t stmmac_msi_intr_tx(int irq, void *data)
> > > +static irqreturn_t stmmac_dma_tx_interrupt(int irq, void *data)
> > > {
> > > struct stmmac_tx_queue *tx_q = (struct stmmac_tx_queue *)data;
> > > struct stmmac_dma_conf *dma_conf;
> > > @@ -6107,7 +6107,7 @@ static irqreturn_t stmmac_msi_intr_tx(int irq,
> > void *data)
> > > return IRQ_HANDLED;
> > > }
> > >
> > > -static irqreturn_t stmmac_msi_intr_rx(int irq, void *data)
> > > +static irqreturn_t stmmac_dma_rx_interrupt(int irq, void *data)
> > > {
> > > struct stmmac_rx_queue *rx_q = (struct stmmac_rx_queue *)data;
> > > struct stmmac_dma_conf *dma_conf;
> > > @@ -7456,8 +7456,8 @@ 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->multi_msi_en =
> > > - (priv->plat->flags & STMMAC_FLAG_MULTI_MSI_EN);
> > > + priv->plat->dma_cfg->multi_irq_en =
> > > + (priv->plat->flags & STMMAC_FLAG_MULTI_IRQ_EN);
> > >
> > > priv->dev->irq = res->irq;
> > > priv->wol_irq = res->wol_irq;
> > > diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h index
> > > dee5ad6e48c5..b950e6f9761d 100644
> > > --- a/include/linux/stmmac.h
> > > +++ b/include/linux/stmmac.h
> > > @@ -98,7 +98,7 @@ struct stmmac_dma_cfg {
> > > int mixed_burst;
> > > bool aal;
> > > bool eame;
> > > - bool multi_msi_en;
> > > + bool multi_irq_en;
> > > bool dche;
> > > };
> > >
> > > @@ -215,7 +215,7 @@ struct dwmac4_addrs {
> > > #define STMMAC_FLAG_TSO_EN BIT(4)
> > > #define STMMAC_FLAG_SERDES_UP_AFTER_PHY_LINKUP BIT(5)
> > > #define STMMAC_FLAG_VLAN_FAIL_Q_EN BIT(6)
> > > -#define STMMAC_FLAG_MULTI_MSI_EN BIT(7)
> > > +#define STMMAC_FLAG_MULTI_IRQ_EN BIT(7)
> > > #define STMMAC_FLAG_EXT_SNAPSHOT_EN BIT(8)
> > > #define STMMAC_FLAG_INT_SNAPSHOT_EN BIT(9)
> > > #define STMMAC_FLAG_RX_CLK_RUNS_IN_LPI BIT(10)
> > > --
> > > 2.34.1
> > >
> > >

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