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authorGovindarajulu Varadarajan <_govind@gmx.com>2015-10-30 14:22:51 +0300
committerDavid S. Miller <davem@davemloft.net>2015-11-02 23:08:00 +0300
commit322cf7e3a4e89236ae386cb5668ae0d787d21136 (patch)
tree3443cc196e6bfd7a8ddb87f8704ae738824d78a0 /drivers/net/ethernet/cisco
parent9920e48b830a0f4ec06bcbf0ec3147c88ae72bac (diff)
downloadlinux-322cf7e3a4e89236ae386cb5668ae0d787d21136.tar.xz
enic: assign affinity hint to interrupts
The affinity hint is used by the user space daemon, irqbalancer, to indicate a preferred CPU mask for irqs. This patch sets the irq affinity hint to local numa core first, when exausted we try non-local numa cores. Also set tx xps cpus mask bassed on affinity hint. v2: remove the global affinity policy. Signed-off-by: Govindarajulu Varadarajan <_govind@gmx.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/cisco')
-rw-r--r--drivers/net/ethernet/cisco/enic/enic.h27
-rw-r--r--drivers/net/ethernet/cisco/enic/enic_main.c72
2 files changed, 99 insertions, 0 deletions
diff --git a/drivers/net/ethernet/cisco/enic/enic.h b/drivers/net/ethernet/cisco/enic/enic.h
index 6401ba99457f..1671fa3332c2 100644
--- a/drivers/net/ethernet/cisco/enic/enic.h
+++ b/drivers/net/ethernet/cisco/enic/enic.h
@@ -50,6 +50,7 @@ struct enic_msix_entry {
char devname[IFNAMSIZ];
irqreturn_t (*isr)(int, void *);
void *devid;
+ cpumask_var_t affinity_mask;
};
/* Store only the lower range. Higher range is given by fw. */
@@ -263,6 +264,32 @@ static inline unsigned int enic_msix_notify_intr(struct enic *enic)
return enic->rq_count + enic->wq_count + 1;
}
+static inline bool enic_is_err_intr(struct enic *enic, int intr)
+{
+ switch (vnic_dev_get_intr_mode(enic->vdev)) {
+ case VNIC_DEV_INTR_MODE_INTX:
+ return intr == enic_legacy_err_intr();
+ case VNIC_DEV_INTR_MODE_MSIX:
+ return intr == enic_msix_err_intr(enic);
+ case VNIC_DEV_INTR_MODE_MSI:
+ default:
+ return false;
+ }
+}
+
+static inline bool enic_is_notify_intr(struct enic *enic, int intr)
+{
+ switch (vnic_dev_get_intr_mode(enic->vdev)) {
+ case VNIC_DEV_INTR_MODE_INTX:
+ return intr == enic_legacy_notify_intr();
+ case VNIC_DEV_INTR_MODE_MSIX:
+ return intr == enic_msix_notify_intr(enic);
+ case VNIC_DEV_INTR_MODE_MSI:
+ default:
+ return false;
+ }
+}
+
static inline int enic_dma_map_check(struct enic *enic, dma_addr_t dma_addr)
{
if (unlikely(pci_dma_mapping_error(enic->pdev, dma_addr))) {
diff --git a/drivers/net/ethernet/cisco/enic/enic_main.c b/drivers/net/ethernet/cisco/enic/enic_main.c
index 0c22fd014378..b36643ef0593 100644
--- a/drivers/net/ethernet/cisco/enic/enic_main.c
+++ b/drivers/net/ethernet/cisco/enic/enic_main.c
@@ -39,6 +39,7 @@
#include <linux/prefetch.h>
#include <net/ip6_checksum.h>
#include <linux/ktime.h>
+#include <linux/numa.h>
#ifdef CONFIG_RFS_ACCEL
#include <linux/cpu_rmap.h>
#endif
@@ -112,6 +113,71 @@ static struct enic_intr_mod_range mod_range[ENIC_MAX_LINK_SPEEDS] = {
{3, 6}, /* 10 - 40 Gbps */
};
+static void enic_init_affinity_hint(struct enic *enic)
+{
+ int numa_node = dev_to_node(&enic->pdev->dev);
+ int i;
+
+ for (i = 0; i < enic->intr_count; i++) {
+ if (enic_is_err_intr(enic, i) || enic_is_notify_intr(enic, i) ||
+ (enic->msix[i].affinity_mask &&
+ !cpumask_empty(enic->msix[i].affinity_mask)))
+ continue;
+ if (zalloc_cpumask_var(&enic->msix[i].affinity_mask,
+ GFP_KERNEL))
+ cpumask_set_cpu(cpumask_local_spread(i, numa_node),
+ enic->msix[i].affinity_mask);
+ }
+}
+
+static void enic_free_affinity_hint(struct enic *enic)
+{
+ int i;
+
+ for (i = 0; i < enic->intr_count; i++) {
+ if (enic_is_err_intr(enic, i) || enic_is_notify_intr(enic, i))
+ continue;
+ free_cpumask_var(enic->msix[i].affinity_mask);
+ }
+}
+
+static void enic_set_affinity_hint(struct enic *enic)
+{
+ int i;
+ int err;
+
+ for (i = 0; i < enic->intr_count; i++) {
+ if (enic_is_err_intr(enic, i) ||
+ enic_is_notify_intr(enic, i) ||
+ !enic->msix[i].affinity_mask ||
+ cpumask_empty(enic->msix[i].affinity_mask))
+ continue;
+ err = irq_set_affinity_hint(enic->msix_entry[i].vector,
+ enic->msix[i].affinity_mask);
+ if (err)
+ netdev_warn(enic->netdev, "irq_set_affinity_hint failed, err %d\n",
+ err);
+ }
+
+ for (i = 0; i < enic->wq_count; i++) {
+ int wq_intr = enic_msix_wq_intr(enic, i);
+
+ if (enic->msix[wq_intr].affinity_mask &&
+ !cpumask_empty(enic->msix[wq_intr].affinity_mask))
+ netif_set_xps_queue(enic->netdev,
+ enic->msix[wq_intr].affinity_mask,
+ i);
+ }
+}
+
+static void enic_unset_affinity_hint(struct enic *enic)
+{
+ int i;
+
+ for (i = 0; i < enic->intr_count; i++)
+ irq_set_affinity_hint(enic->msix_entry[i].vector, NULL);
+}
+
int enic_is_dynamic(struct enic *enic)
{
return enic->pdev->device == PCI_DEVICE_ID_CISCO_VIC_ENET_DYN;
@@ -1649,6 +1715,8 @@ static int enic_open(struct net_device *netdev)
netdev_err(netdev, "Unable to request irq.\n");
return err;
}
+ enic_init_affinity_hint(enic);
+ enic_set_affinity_hint(enic);
err = enic_dev_notify_set(enic);
if (err) {
@@ -1701,6 +1769,7 @@ err_out_free_rq:
vnic_rq_clean(&enic->rq[i], enic_free_rq_buf);
enic_dev_notify_unset(enic);
err_out_free_intr:
+ enic_unset_affinity_hint(enic);
enic_free_intr(enic);
return err;
@@ -1754,6 +1823,7 @@ static int enic_stop(struct net_device *netdev)
}
enic_dev_notify_unset(enic);
+ enic_unset_affinity_hint(enic);
enic_free_intr(enic);
for (i = 0; i < enic->wq_count; i++)
@@ -2309,6 +2379,7 @@ static void enic_dev_deinit(struct enic *enic)
enic_free_vnic_resources(enic);
enic_clear_intr_mode(enic);
+ enic_free_affinity_hint(enic);
}
static void enic_kdump_kernel_config(struct enic *enic)
@@ -2404,6 +2475,7 @@ static int enic_dev_init(struct enic *enic)
return 0;
err_out_free_vnic_resources:
+ enic_free_affinity_hint(enic);
enic_clear_intr_mode(enic);
enic_free_vnic_resources(enic);