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-rw-r--r--net/dsa/tag_8021q.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/net/dsa/tag_8021q.c b/net/dsa/tag_8021q.c
index e44e6275b0a1..9c1cc2482b68 100644
--- a/net/dsa/tag_8021q.c
+++ b/net/dsa/tag_8021q.c
@@ -28,6 +28,7 @@
*
* RSV - VID[9]:
* To be used for further expansion of SWITCH_ID or for other purposes.
+ * Must be transmitted as zero and ignored on receive.
*
* SWITCH_ID - VID[8:6]:
* Index of switch within DSA tree. Must be between 0 and
@@ -35,6 +36,7 @@
*
* RSV - VID[5:4]:
* To be used for further expansion of PORT or for other purposes.
+ * Must be transmitted as zero and ignored on receive.
*
* PORT - VID[3:0]:
* Index of switch port. Must be between 0 and DSA_MAX_PORTS - 1.