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--- sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c.orig
+++ sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
@@ -128,6 +128,15 @@
#define HV_NV_SC_PTR_OFFSET_IN_BUF 0
#define HV_NV_PACKET_OFFSET_IN_BUF 16
+/*
+ * A unified flag for all outbound check sum flags is useful,
+ * and it helps avoiding unnecessary check sum calculation in
+ * network forwarding scenario.
+ */
+#define HV_CSUM_FOR_OUTBOUND \
+ (CSUM_IP|CSUM_IP_UDP|CSUM_IP_TCP|CSUM_IP_SCTP|CSUM_IP_TSO| \
+ CSUM_IP_ISCSI|CSUM_IP6_UDP|CSUM_IP6_TCP|CSUM_IP6_SCTP| \
+ CSUM_IP6_TSO|CSUM_IP6_ISCSI)
/*
* Data types
@@ -570,7 +579,8 @@
packet->vlan_tci & 0xfff;
}
- if (0 == m_head->m_pkthdr.csum_flags) {
+ /* Only check the flags for outbound and ignore the ones for inbound */
+ if (0 == (m_head->m_pkthdr.csum_flags & HV_CSUM_FOR_OUTBOUND)) {
goto pre_send;
}
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