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cxgb3: ease msi-x settings conditions 

The driver currently drops to line interrupt mode
if it did not get all the msi-x vectors it requested.

Allow msi-x settings when a minimal amount of vectors
is provided.

Signed-off-by: Divy Le Ray <divy@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Divy Le Ray 2009-01-18 21:29:40 -08:00 committed by David S. Miller
parent c405b82816
commit 5cda9364f1
2 changed files with 16 additions and 8 deletions
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1
drivers/net/cxgb3/adapter.h
View File

@ -230,6 +230,7 @@ struct adapter {
unsigned int slow_intr_mask;
unsigned long irq_stats[IRQ_NUM_STATS];
int msix_nvectors;
struct {
unsigned short vec;
char desc[22];

23
drivers/net/cxgb3/cxgb3_main.c
View File

@ -338,7 +338,7 @@ static void free_irq_resources(struct adapter *adapter)
free_irq(adapter->msix_info[0].vec, adapter);
for_each_port(adapter, i)
n += adap2pinfo(adapter, i)->nqsets;
n += adap2pinfo(adapter, i)->nqsets;
for (i = 0; i < n; ++i)
free_irq(adapter->msix_info[i + 1].vec,
@ -2752,7 +2752,7 @@ static void set_nqsets(struct adapter *adap)
int i, j = 0;
int num_cpus = num_online_cpus();
int hwports = adap->params.nports;
int nqsets = SGE_QSETS;
int nqsets = adap->msix_nvectors - 1;
if (adap->params.rev > 0 && adap->flags & USING_MSIX) {
if (hwports == 2 &&
@ -2781,18 +2781,25 @@ static void set_nqsets(struct adapter *adap)
static int __devinit cxgb_enable_msix(struct adapter *adap)
{
struct msix_entry entries[SGE_QSETS + 1];
int vectors;
int i, err;
for (i = 0; i < ARRAY_SIZE(entries); ++i)
vectors = ARRAY_SIZE(entries);
for (i = 0; i < vectors; ++i)
entries[i].entry = i;
err = pci_enable_msix(adap->pdev, entries, ARRAY_SIZE(entries));
while ((err = pci_enable_msix(adap->pdev, entries, vectors)) > 0)
vectors = err;
if (!err && vectors < (adap->params.nports + 1))
err = -1;
if (!err) {
for (i = 0; i < ARRAY_SIZE(entries); ++i)
for (i = 0; i < vectors; ++i)
adap->msix_info[i].vec = entries[i].vector;
} else if (err > 0)
dev_info(&adap->pdev->dev,
"only %d MSI-X vectors left, not using MSI-X\n", err);
adap->msix_nvectors = vectors;
}
return err;
}