Set the number of CPUs to be used to handle separated flows on
receive. The default maximum is 16, but we never use more than
half the online processors.
Signed-off-by: Hong H. Pham <hong.pham@xxxxxxxxxxxxx>
Signed-off-by: Chris Torek <chris.torek@xxxxxxxxxxxxx>
---
drivers/net/niu.c | 30 ++++++++++++++++++++++++++++++
1 files changed, 30 insertions(+), 0 deletions(-)
diff --git a/drivers/net/niu.c b/drivers/net/niu.c
index c82e970..488a4ae 100644
--- a/drivers/net/niu.c
+++ b/drivers/net/niu.c
@@ -76,6 +76,14 @@ static unsigned int rbr_refill_min __read_mostly = RBR_REFILL_MIN;
module_param(rbr_refill_min, uint, 0644);
MODULE_PARM_DESC(rbr_refill_min, "Minimum RBR refill threshold");
+/*
+ * An upper limit of 16 CPUs in rxflow separation usually works well.
+ * Lowering this value to 0 reverts the driver to pre-rxflow behavior.
+ */
+static unsigned int rxflow_max_cpus = 16;
+module_param(rxflow_max_cpus, uint, 0644);
+MODULE_PARM_DESC(rxflow_max_cpus, "Maximum CPUs for RXflow separation");
+
#ifndef readq
static u64 readq(void __iomem *reg)
{
@@ -9812,6 +9820,26 @@ static void __devinit niu_driver_version(void)
pr_info("%s", version);
}
+#ifdef CONFIG_SMP
+/*
+ * Set number of CPUs to handle flow separation on receive. We
+ * want half the online CPUs, or the module-parameter upper limit
+ * (normally 16), whichever is smaller.
+ */
+static void __devinit niu_set_default_rx_cpus(struct net_device *dev)
+{
+ unsigned int n;
+
+ n = num_online_cpus() / 2;
+ if (n > rxflow_max_cpus)
+ n = rxflow_max_cpus;
+
+ dev->rx_cpus = n;
+}
+#else
+#define niu_set_default_rx_cpus(dev) do {} while (0)
+#endif /* CONFIG_SMP */
+
static struct net_device * __devinit niu_alloc_and_init(
struct device *gen_dev, struct pci_dev *pdev,
struct of_device *op, const struct niu_ops *ops,
@@ -9842,6 +9870,8 @@ static struct net_device * __devinit niu_alloc_and_init(
np->port = port;
+ niu_set_default_rx_cpus(dev);
+
return dev;
}
--
1.6.0.4.766.g6fc4a
--
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