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hyperv/hn: Update VF's ibytes properly under transparent VF mode.

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While, I'm here add comment about why updating VF's imcast stat is
not necessary.

MFC after:	3 days
Sponsored by:	Microsoft
Differential Revision:	https://reviews.freebsd.org/D11948
This commit is contained in:
Sepherosa Ziehau 2017-08-14 05:30:02 +00:00
parent a6e709f29c
commit 3bed4e54f8
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=322483
1 changed files with 26 additions and 5 deletions
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31
sys/dev/hyperv/netvsc/if_hn.c
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@ -1266,16 +1266,37 @@ hn_xpnt_vf_input(struct ifnet *vf_ifp, struct mbuf *m)
rm_runlock(&hn_vfmap_lock, &pt);
if (hn_ifp != NULL) {
/*
* Fix up rcvif and go through hn(4)'s if_input and
* increase ipackets.
*/
for (mn = m; mn != NULL; mn = mn->m_nextpkt) {
/* Allow tapping on the VF. */
/*
* Allow tapping on the VF.
*/
ETHER_BPF_MTAP(vf_ifp, mn);
/*
* Update VF stats.
*/
if ((vf_ifp->if_capenable & IFCAP_HWSTATS) == 0) {
if_inc_counter(vf_ifp, IFCOUNTER_IBYTES,
mn->m_pkthdr.len);
}
/*
* XXX IFCOUNTER_IMCAST
* This stat updating is kinda invasive, since it
* requires two checks on the mbuf: the length check
* and the ethernet header check. As of this write,
* all multicast packets go directly to hn(4), which
* makes imcast stat updating in the VF a try in vian.
*/
/*
* Fix up rcvif and increase hn(4)'s ipackets.
*/
mn->m_pkthdr.rcvif = hn_ifp;
if_inc_counter(hn_ifp, IFCOUNTER_IPACKETS, 1);
}
/*
* Go through hn(4)'s if_input.
*/
hn_ifp->if_input(hn_ifp, m);
} else {
/*