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>

diff --git a/drivers/net/cxgb3/adapter.h b/drivers/net/cxgb3/adapter.h
index a89d8cc..5fb7c68 100644 (file)
--- a/drivers/net/cxgb3/adapter.h
+++ b/drivers/net/cxgb3/adapter.h
@@ -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];

diff --git a/drivers/net/cxgb3/cxgb3_main.c b/drivers/net/cxgb3/cxgb3_main.c
index 0089746..52131bd 100644 (file)
--- a/drivers/net/cxgb3/cxgb3_main.c
+++ b/drivers/net/cxgb3/cxgb3_main.c
@@ -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;
 }