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hyperv/hn: Enable IP header checksum offloading

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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
This commit is contained in:
Sepherosa Ziehau 2016-02-05 05:01:02 +00:00
parent 74506a55d6
commit b0fde7e820
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=295298
1 changed files with 4 additions and 1 deletions
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5
sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
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@ -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 len)
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;