Commit 325dde48 authored by Stephen Hemminger's avatar Stephen Hemminger Committed by Jeff Garzik
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[PATCH] chelsio: add MSI support 



Using MSI can avoid sharing IRQ and associated overhead.
Tested on PCI-X.

Signed-off-by: default avatarStephen Hemminger <shemminger@osdl.org>
Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
parent 57834ca1

drivers/net/chelsio/common.h

+1 −0
Original line number Diff line number Diff line
@@ -228,6 +228,7 @@ struct adapter_params { 
	unsigned short chip_revision;

	unsigned char  chip_version;

	unsigned char  is_asic;

	unsigned char  has_msi;

};



struct link_config {

drivers/net/chelsio/cxgb2.c

+17 −3
Original line number Diff line number Diff line
@@ -107,6 +107,10 @@ static int t1powersave = 1; /* HW default is powersave mode. */ 
module_param(t1powersave, int, 0);

MODULE_PARM_DESC(t1powersave, "Enable/Disable T1 powersaving mode");



static int disable_msi = 0;

module_param(disable_msi, int, 0);

MODULE_PARM_DESC(disable_msi, "Disable Message Signaled Interrupt (MSI)");



static const char pci_speed[][4] = {

	"33", "66", "100", "133"

};
@@ -215,11 +219,19 @@ static int cxgb_up(struct adapter *adapter) 
	}



	t1_interrupts_clear(adapter);

	if ((err = request_irq(adapter->pdev->irq,

			       t1_select_intr_handler(adapter), IRQF_SHARED,

			       adapter->name, adapter))) {



	adapter->params.has_msi = !disable_msi && pci_enable_msi(adapter->pdev) == 0;

	err = request_irq(adapter->pdev->irq,

			  t1_select_intr_handler(adapter),

			  adapter->params.has_msi ? 0 : IRQF_SHARED,

			  adapter->name, adapter);

	if (err) {

		if (adapter->params.has_msi)

			pci_disable_msi(adapter->pdev);



		goto out_err;

	}



	t1_sge_start(adapter->sge);

	t1_interrupts_enable(adapter);

 out_err:
@@ -234,6 +246,8 @@ static void cxgb_down(struct adapter *adapter) 
	t1_sge_stop(adapter->sge);

	t1_interrupts_disable(adapter);

	free_irq(adapter->pdev->irq, adapter);

	if (adapter->params.has_msi)

		pci_disable_msi(adapter->pdev);

}



static int cxgb_open(struct net_device *dev)