The following reply was made to PR kern/183139; it has been noted by GNATS.
From: =?ISO-8859-1?Q?Roger_Pau_Monn=E9?= <roger....@citrix.com>
To: <bug-follo...@freebsd.org>, <mcdou...@egr.msu.edu>
Cc:
Subject: Re: kern/183139: ifconfig options on xn0 lost after xen vm migration
to another server
Date: Mon, 28 Oct 2013 17:13:01 +0100
Hello,
The following patch seems to solve the problem, but I'm not that much
familiar with netfront or net drivers in general (also netfront code is
not that great, which makes it even harder to understand IMHO).
---
diff --git a/sys/dev/xen/netfront/netfront.c b/sys/dev/xen/netfront/netfront.c
index f9c72e6..99d3cf9 100644
--- a/sys/dev/xen/netfront/netfront.c
+++ b/sys/dev/xen/netfront/netfront.c
@@ -2022,15 +2022,31 @@ static int
xn_configure_features(struct netfront_info *np)
{
int err;
+ bool resume;
err = 0;
+ resume = !!np->xn_ifp->if_capenable;
+
+ if (!resume || ((np->xn_ifp->if_capenable & np->xn_ifp->if_capabilities)
+ != np->xn_ifp->if_capenable)) {
+ /*
+ * Check if current enabled capabilities are available,
+ * if not switch to default capabilities.
+ */
#if __FreeBSD_version >= 700000
- if ((np->xn_ifp->if_capenable & IFCAP_LRO) != 0)
- tcp_lro_free(&np->xn_lro);
+ if ((np->xn_ifp->if_capenable & IFCAP_LRO) != 0)
+ tcp_lro_free(&np->xn_lro);
#endif
- np->xn_ifp->if_capenable =
- np->xn_ifp->if_capabilities & ~(IFCAP_LRO|IFCAP_TSO4);
- np->xn_ifp->if_hwassist &= ~CSUM_TSO;
+ np->xn_ifp->if_capenable =
+ np->xn_ifp->if_capabilities & ~(IFCAP_LRO|IFCAP_TSO4);
+ np->xn_ifp->if_hwassist &= ~CSUM_TSO;
+ } else {
+ /*
+ * What we have currently enabled is supported by the
+ * new host, no need to change anything.
+ */
+ return 0;
+ }
#if __FreeBSD_version >= 700000
if (xn_enable_lro && (np->xn_ifp->if_capabilities & IFCAP_LRO) != 0) {
err = tcp_lro_init(&np->xn_lro);
--
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