net/e1000: set min and max MTU

[dpdk.git] / drivers / net / e1000 / e1000_ethdev.h

diff --git a/drivers/net/e1000/e1000_ethdev.h b/drivers/net/e1000/e1000_ethdev.h
index 94edff0..3e74cd8 100644 (file)
--- a/drivers/net/e1000/e1000_ethdev.h
+++ b/drivers/net/e1000/e1000_ethdev.h
@@ -88,6 +88,12 @@
        ETH_RSS_IPV6_TCP_EX | \
        ETH_RSS_IPV6_UDP_EX)
 
+/*
+ * The overhead from MTU to max frame size.
+ * Considering VLAN so a tag needs to be counted.
+ */
+#define E1000_ETH_OVERHEAD (ETHER_HDR_LEN + ETHER_CRC_LEN + VLAN_TAG_SIZE)
+
 /*
  * Maximum number of Ring Descriptors.
  *