kni: allow configuring thread granularity

[dpdk.git] / kernel / linux / kni / kni_misc.c

diff --git a/kernel/linux/kni/kni_misc.c b/kernel/linux/kni/kni_misc.c
index f10dcd0..e8a8203 100644 (file)
--- a/kernel/linux/kni/kni_misc.c
+++ b/kernel/linux/kni/kni_misc.c
@@ -45,6 +45,10 @@ uint32_t kni_dflt_carrier;
 static char *enable_bifurcated;
 uint32_t bifurcated_support;
 
+/* KNI thread scheduling interval */
+static long min_scheduling_interval = 100; /* us */
+static long max_scheduling_interval = 200; /* us */
+
 #define KNI_DEV_IN_USE_BIT_NUM 0 /* Bit number for device in use */
 
 static int kni_net_id;
@@ -132,11 +136,8 @@ kni_thread_single(void *data)
                        }
                }
                up_read(&knet->kni_list_lock);
-#ifdef RTE_KNI_PREEMPT_DEFAULT
                /* reschedule out for a while */
-               schedule_timeout_interruptible(
-                       usecs_to_jiffies(KNI_KTHREAD_RESCHEDULE_INTERVAL));
-#endif
+               usleep_range(min_scheduling_interval, max_scheduling_interval);
        }
 
        return 0;
@@ -153,10 +154,7 @@ kni_thread_multiple(void *param)
                        kni_net_rx(dev);
                        kni_net_poll_resp(dev);
                }
-#ifdef RTE_KNI_PREEMPT_DEFAULT
-               schedule_timeout_interruptible(
-                       usecs_to_jiffies(KNI_KTHREAD_RESCHEDULE_INTERVAL));
-#endif
+               usleep_range(min_scheduling_interval, max_scheduling_interval);
        }
 
        return 0;
@@ -617,6 +615,14 @@ kni_init(void)
        if (bifurcated_support == 1)
                pr_debug("bifurcated support is enabled.\n");
 
+       if (min_scheduling_interval < 0 || max_scheduling_interval < 0 ||
+               min_scheduling_interval > KNI_KTHREAD_MAX_RESCHEDULE_INTERVAL ||
+               max_scheduling_interval > KNI_KTHREAD_MAX_RESCHEDULE_INTERVAL ||
+               min_scheduling_interval >= max_scheduling_interval) {
+               pr_err("Invalid parameters for scheduling interval\n");
+               return -EINVAL;
+       }
+
 #ifdef HAVE_SIMPLIFIED_PERNET_OPERATIONS
        rc = register_pernet_subsys(&kni_net_ops);
 #else
@@ -692,3 +698,13 @@ MODULE_PARM_DESC(enable_bifurcated,
 "\t\ton    Enable request processing support for bifurcated drivers.\n"
 "\t\t"
 );
+
+module_param(min_scheduling_interval, long, 0644);
+MODULE_PARM_DESC(min_scheduling_interval,
+"KNI thread min scheduling interval (default=100 microseconds)"
+);
+
+module_param(max_scheduling_interval, long, 0644);
+MODULE_PARM_DESC(max_scheduling_interval,
+"KNI thread max scheduling interval (default=200 microseconds)"
+);