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hyperv/hn: Properly handle synthetic parts reattach failure.

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MFC after:	1 week
Sponsored by:	Microsoft
Differential Revision:	https://reviews.freebsd.org/D8310
This commit is contained in:
Sepherosa Ziehau 2016-10-24 03:42:34 +00:00
parent 6aa8c9a4e0
commit 6827d9497a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=307840
1 changed files with 21 additions and 16 deletions
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37
sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
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@ -1783,19 +1783,6 @@ hn_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
break;
}
/* Obtain and record requested MTU */
ifp->if_mtu = ifr->ifr_mtu;
#if __FreeBSD_version >= 1100099
/*
* Make sure that LRO aggregation length limit is still
* valid, after the MTU change.
*/
if (sc->hn_rx_ring[0].hn_lro.lro_length_lim <
HN_LRO_LENLIM_MIN(ifp))
hn_set_lro_lenlim(sc, HN_LRO_LENLIM_MIN(ifp));
#endif
/*
* Suspend this interface before the synthetic parts
* are ripped.
@ -1810,13 +1797,31 @@ hn_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
/*
* Reattach the synthetic parts, i.e. NVS and RNDIS,
* with the new MTU setting.
* XXX check error.
*/
hn_synth_attach(sc, ifr->ifr_mtu);
error = hn_synth_attach(sc, ifr->ifr_mtu);
if (error) {
HN_UNLOCK(sc);
break;
}
/*
* Commit the requested MTU, after the synthetic parts
* have been successfully attached.
*/
ifp->if_mtu = ifr->ifr_mtu;
/*
* Make sure that various parameters based on MTU are
* still valid, after the MTU change.
*/
if (sc->hn_tx_ring[0].hn_chim_size > sc->hn_chim_szmax)
hn_set_chim_size(sc, sc->hn_chim_szmax);
hn_set_tso_maxsize(sc, hn_tso_maxlen, ifr->ifr_mtu);
hn_set_tso_maxsize(sc, hn_tso_maxlen, ifp->if_mtu);
#if __FreeBSD_version >= 1100099
if (sc->hn_rx_ring[0].hn_lro.lro_length_lim <
HN_LRO_LENLIM_MIN(ifp))
hn_set_lro_lenlim(sc, HN_LRO_LENLIM_MIN(ifp));
#endif
/*
* All done! Resume the interface now.