Author: sephe
Date: Fri Feb 5 05:01:02 2016
New Revision: 295298
URL: https://svnweb.freebsd.org/changeset/base/295298
Log:
hyperv/hn: Enable IP header checksum offloading
So that:
- TCP/IP stack will not do unnecessary IP header checksum for TSO
packets.
- Reduce guest load for non-TSO IP packets.
Reviewed by: adrian
Approved by: adrian (mentor)
MFC after: 1 week
Sponsored by: Microsoft OSTC
Differential Revision: https://reviews.freebsd.org/D5099
Modified:
head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
Modified: head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
==============================================================================
--- head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c Fri Feb 5 04:10:04
2016 (r295297)
+++ head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c Fri Feb 5 05:01:02
2016 (r295298)
@@ -172,7 +172,7 @@ struct hn_txdesc {
* Windows releases.
*/
#define HN_CSUM_ASSIST_WIN8 (CSUM_TCP)
-#define HN_CSUM_ASSIST (CSUM_UDP | CSUM_TCP)
+#define HN_CSUM_ASSIST (CSUM_IP | CSUM_UDP | CSUM_TCP)
/* XXX move to netinet/tcp_lro.h */
#define HN_LRO_HIWAT_MAX 65535
@@ -867,6 +867,9 @@ hn_start_locked(struct ifnet *ifp, int l
rppi->per_packet_info_offset);
csum_info->xmit.is_ipv4 = 1;
+ if (m_head->m_pkthdr.csum_flags & CSUM_IP)
+ csum_info->xmit.ip_header_csum = 1;
+
if (m_head->m_pkthdr.csum_flags & CSUM_TCP) {
csum_info->xmit.tcp_csum = 1;
csum_info->xmit.tcp_header_offset = 0;
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