From 18fd9598007558af62d8e9f4f7f7ef8557d4f9bf Mon Sep 17 00:00:00 2001 From: whu Date: Thu, 30 Jul 2015 02:22:38 +0000 Subject: [PATCH] MFC r285928 Do not enable UDP checksum offloading when running on the Hyper-V on Windows Server 2012 and earlier hosts. Submitted by: whu Reviewed by: royger Approved by: re (gjb) Sponsored by: Microsoft OSTC Differential Revision: https://reviews.freebsd.org/D3102 git-svn-id: https://svn.freebsd.org/base/releng/10.2@286058 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f --- sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c | 22 +++++++++++++++++-- 1 file changed, 20 insertions(+), 2 deletions(-) diff --git a/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c b/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c index 4590081f3..5502d1bf4 100644 --- a/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c +++ b/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c @@ -343,7 +343,15 @@ netvsc_attach(device_t dev) IFCAP_VLAN_HWTAGGING | IFCAP_VLAN_MTU | IFCAP_HWCSUM | IFCAP_TSO; ifp->if_capenable |= IFCAP_VLAN_HWTAGGING | IFCAP_VLAN_MTU | IFCAP_HWCSUM | IFCAP_TSO; - ifp->if_hwassist = CSUM_TCP | CSUM_UDP | CSUM_TSO; + /* + * Only enable UDP checksum offloading when it is on 2012R2 or + * later. UDP checksum offloading doesn't work on earlier + * Windows releases. + */ + if (hv_vmbus_protocal_version >= HV_VMBUS_VERSION_WIN8_1) + ifp->if_hwassist = CSUM_TCP | CSUM_UDP | CSUM_TSO; + else + ifp->if_hwassist = CSUM_TCP | CSUM_TSO; ret = hv_rf_on_device_add(device_ctx, &device_info); if (ret != 0) { @@ -1110,7 +1118,17 @@ hn_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) ifp->if_hwassist &= ~(CSUM_TCP | CSUM_UDP); } else { ifp->if_capenable |= IFCAP_TXCSUM; - ifp->if_hwassist |= (CSUM_TCP | CSUM_UDP); + /* + * Only enable UDP checksum offloading on + * Windows Server 2012R2 or later releases. + */ + if (hv_vmbus_protocal_version >= + HV_VMBUS_VERSION_WIN8_1) { + ifp->if_hwassist |= + (CSUM_TCP | CSUM_UDP); + } else { + ifp->if_hwassist |= CSUM_TCP; + } } } -- 2.42.0