[dpdk-dev] [PATCH] kni: add module parameter 'bind_to_core'

[Vladyslav Buslov <vladyslav.buslov@harmonicinc.com>]

Allow binding KNI thread to specific core in single threaded mode.

Signed-off-by: Vladyslav Buslov <vladyslav.buslov@harmonicinc.com>
---
 lib/librte_eal/linuxapp/kni/kni_misc.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/lib/librte_eal/linuxapp/kni/kni_misc.c b/lib/librte_eal/linuxapp/kni/kni_misc.c
index 59d15ca..e98f4a9 100644
--- a/lib/librte_eal/linuxapp/kni/kni_misc.c
+++ b/lib/librte_eal/linuxapp/kni/kni_misc.c
@@ -93,6 +93,7 @@ static char *lo_mode = NULL;
 /* Kernel thread mode */
 static char *kthread_mode = NULL;
 static unsigned multiple_kthread_on = 0;
+static int bind_to_core = -1;
 
 #define KNI_DEV_IN_USE_BIT_NUM 0 /* Bit number for device in use */
 
@@ -239,12 +240,17 @@ kni_open(struct inode *inode, struct file *file)
 	if (multiple_kthread_on == 0) {
 		KNI_PRINT("Single kernel thread for all KNI devices\n");
 		/* Create kernel thread for RX */
-		knet->kni_kthread = kthread_run(kni_thread_single, (void *)knet,
+		knet->kni_kthread = kthread_create(kni_thread_single, (void *)knet,
 						"kni_single");
 		if (IS_ERR(knet->kni_kthread)) {
 			KNI_ERR("Unable to create kernel threaed\n");
 			return PTR_ERR(knet->kni_kthread);
 		}
+		if (bind_to_core >= 0) {
+			KNI_PRINT("Bind main thread to core %d\n", bind_to_core);
+			kthread_bind(knet->kni_kthread, bind_to_core);
+		}
+		wake_up_process(knet->kni_kthread);
 	} else
 		KNI_PRINT("Multiple kernel thread mode enabled\n");
 
@@ -698,3 +704,8 @@ MODULE_PARM_DESC(kthread_mode,
 "    multiple  Multiple kernel thread mode enabled.\n"
 "\n"
 );
+
+module_param(bind_to_core, int, S_IRUGO);
+MODULE_PARM_DESC(bind_to_core,
+"Bind KNI main kernel thread to specific core (default=-1(disabled)):\n"
+);
\ No newline at end of file
-- 
2.8.3