From: Ferruh Yigit <ferruh.yigit@intel.com>
Date: Thu, 24 Jun 2021 13:32:16 +0000 (+0100)
Subject: kni: update link only on change
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=b67f598e23c892894e48fdec49b9d48bc0d743b7;p=dpdk.git

kni: update link only on change

'rte_kni_update_link()' updates virtual KNI interface link using kernel
sysfs interface.
If the requested link status is same as interface link status, do not
update the link status but return with success.

Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
---

diff --git a/lib/kni/rte_kni.c b/lib/kni/rte_kni.c
index eb24b0d0ae..d3e236005e 100644
--- a/lib/kni/rte_kni.c
+++ b/lib/kni/rte_kni.c
@@ -811,6 +811,9 @@ rte_kni_update_link(struct rte_kni *kni, unsigned int linkup)
 	}
 	old_linkup = (old_carrier[0] == '1');
 
+	if (old_linkup == (int)linkup)
+		goto out;
+
 	new_carrier = linkup ? "1" : "0";
 	ret = write(fd, new_carrier, 1);
 	if (ret < 1) {
@@ -818,7 +821,7 @@ rte_kni_update_link(struct rte_kni *kni, unsigned int linkup)
 		close(fd);
 		return -1;
 	}
-
+out:
 	close(fd);
 	return old_linkup;
 }
diff --git a/lib/kni/version.map b/lib/kni/version.map
index a93da95f36..bb810a7f2f 100644
--- a/lib/kni/version.map
+++ b/lib/kni/version.map
@@ -19,5 +19,6 @@ DPDK_21 {
 EXPERIMENTAL {
 	global:
 
+	# updated in v21.08
 	rte_kni_update_link;
 };