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Commit d41c628c authored by Ayaz Abdulla's avatar Ayaz Abdulla Committed by David S. Miller
Browse files

forcedeth: remove msix + napi 



This patch removes support for msix running in conjunction with napi.
There has been reported issues regarding the behaviour of irqmask and
generation of interrupts by the HW when in MSIX mode. When running napi,
the driver is constantly turning off/on the irqmask. For the time being,
I am going to disable it until I can root cause the issue.

Signed-off-by: default avatarAyaz Abdulla <aabdulla@nvidia.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 08d93575

drivers/net/forcedeth.c

+5 −21
Original line number Diff line number Diff line
@@ -3731,26 +3731,6 @@ static int nv_napi_poll(struct napi_struct *napi, int budget) 
}

#endif



#ifdef CONFIG_FORCEDETH_NAPI

static irqreturn_t nv_nic_irq_rx(int foo, void *data)

{

	struct net_device *dev = (struct net_device *) data;

	struct fe_priv *np = netdev_priv(dev);

	u8 __iomem *base = get_hwbase(dev);

	u32 events;



	events = readl(base + NvRegMSIXIrqStatus) & NVREG_IRQ_RX_ALL;



	if (events) {

		/* disable receive interrupts on the nic */

		writel(NVREG_IRQ_RX_ALL, base + NvRegIrqMask);

		pci_push(base);

		writel(NVREG_IRQ_RX_ALL, base + NvRegMSIXIrqStatus);

		napi_schedule(&np->napi);

	}

	return IRQ_HANDLED;

}

#else

static irqreturn_t nv_nic_irq_rx(int foo, void *data)

{

	struct net_device *dev = (struct net_device *) data;
@@ -3797,7 +3777,6 @@ static irqreturn_t nv_nic_irq_rx(int foo, void *data) 


	return IRQ_RETVAL(i);

}

#endif



static irqreturn_t nv_nic_irq_other(int foo, void *data)

{
@@ -5670,7 +5649,12 @@ static int __devinit nv_probe(struct pci_dev *pci_dev, const struct pci_device_i 
		np->msi_flags |= NV_MSI_CAPABLE;

	}

	if ((id->driver_data & DEV_HAS_MSI_X) && msix) {

		/* msix has had reported issues when modifying irqmask

		   as in the case of napi, therefore, disable for now

		*/

#ifndef CONFIG_FORCEDETH_NAPI

		np->msi_flags |= NV_MSI_X_CAPABLE;

#endif

	}



	np->pause_flags = NV_PAUSEFRAME_RX_CAPABLE | NV_PAUSEFRAME_RX_REQ | NV_PAUSEFRAME_AUTONEG;