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| author | Stephen Hemminger <shemminger@osdl.org> | 2006-12-01 16:36:20 -0800 |
|---|---|---|
| committer | Jeff Garzik <jeff@garzik.org> | 2006-12-02 00:24:50 -0500 |
| commit | 325dde48914e8ec1614d79ffacdbf9c0b8d24f42 (patch) | |
| tree | 7409d3503cd7dbf9b57e6974388a9b386d804be0 /drivers/net/chelsio/cxgb2.c | |
| parent | 57834ca152d5979f3f84f4e25f29f423e19d38fa (diff) | |
| download | blackbird-op-linux-325dde48914e8ec1614d79ffacdbf9c0b8d24f42.tar.gz blackbird-op-linux-325dde48914e8ec1614d79ffacdbf9c0b8d24f42.zip | |
[PATCH] chelsio: add MSI support
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>
Diffstat (limited to 'drivers/net/chelsio/cxgb2.c')
| -rw-r--r-- | drivers/net/chelsio/cxgb2.c | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/drivers/net/chelsio/cxgb2.c b/drivers/net/chelsio/cxgb2.c index 571aa06ddfd4..0ca5b07c1a6b 100644 --- a/drivers/net/chelsio/cxgb2.c +++ b/drivers/net/chelsio/cxgb2.c @@ -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) |
