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[PATCH] chelsio: add MSI support

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

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Stephen Hemminger 2006-12-01 16:36:20 -08:00 committed by Jeff Garzik
parent 57834ca152
commit 325dde4891
2 changed files with 18 additions and 3 deletions
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1
drivers/net/chelsio/common.h
View file

@ -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 {

20
drivers/net/chelsio/cxgb2.c
View file

@ -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)