net/mlx4_en: Don't use irq_affinity_notifier to track changes in IRQ affinity map

[karo-tx-linux.git] / drivers / net / ethernet / mellanox / mlx4 / en_rx.c

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_rx.c b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
index d2d415732d994178117eafb39cc6d8207ce5322e..96724170308a332ca388300447890866ea2610ea 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx4/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
@@ -40,6 +40,7 @@
 #include <linux/if_ether.h>
 #include <linux/if_vlan.h>
 #include <linux/vmalloc.h>
+#include <linux/irq.h>
 
 #include "mlx4_en.h"
 
@@ -896,16 +897,25 @@ int mlx4_en_poll_rx_cq(struct napi_struct *napi, int budget)
 
        /* If we used up all the quota - we're probably not done yet... */
        if (done == budget) {
+               int cpu_curr;
+               const struct cpumask *aff;
+
                INC_PERF_COUNTER(priv->pstats.napi_quota);
-               if (unlikely(cq->mcq.irq_affinity_change)) {
-                       cq->mcq.irq_affinity_change = false;
+
+               cpu_curr = smp_processor_id();
+               aff = irq_desc_get_irq_data(cq->irq_desc)->affinity;
+
+               if (unlikely(!cpumask_test_cpu(cpu_curr, aff))) {
+                       /* Current cpu is not according to smp_irq_affinity -
+                        * probably affinity changed. need to stop this NAPI
+                        * poll, and restart it on the right CPU
+                        */
                        napi_complete(napi);
                        mlx4_en_arm_cq(priv, cq);
                        return 0;
                }
        } else {
                /* Done for now */
-               cq->mcq.irq_affinity_change = false;
                napi_complete(napi);
                mlx4_en_arm_cq(priv, cq);
        }