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ifnet: introduce event handlers for ifup/ifdown events

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Hyper-V's NIC SR-IOV implementation needs a Hyper-V synthetic NIC and
a VF NIC to work together, mainly to support seamless live migration.

When the VF device becomes UP (or DOWN), the synthetic NIC driver needs
to switch the data path from the synthetic NIC to the VF (or the opposite).

So the synthetic NIC driver needs to know when a VF device is becoming
UP or DOWN and hence the patch is made.

Reviewed by:	sephe
Approved by:	sephe (mentor)
MFC after:	2 weeks
Sponsored by:	Microsoft
Differential Revision:	https://reviews.freebsd.org/D8963
This commit is contained in:
Dexuan Cui 2017-01-24 09:19:46 +00:00
parent c927d68136
commit 92a6859b91
2 changed files with 10 additions and 0 deletions
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3
sys/net/if.c
View File

@ -59,6 +59,7 @@
#include <sys/domain.h>
#include <sys/jail.h>
#include <sys/priv.h>
#include <sys/eventhandler.h>
#include <machine/stdarg.h>
#include <vm/uma.h>
@ -2218,6 +2219,7 @@ void
if_down(struct ifnet *ifp)
{
EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_DOWN);
if_unroute(ifp, IFF_UP, AF_UNSPEC);
}
@ -2230,6 +2232,7 @@ if_up(struct ifnet *ifp)
{
if_route(ifp, IFF_UP, AF_UNSPEC);
EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_UP);
}
/*

7
sys/sys/eventhandler.h
View File

@ -284,4 +284,11 @@ typedef void (*swapoff_fn)(void *, struct swdevt *);
EVENTHANDLER_DECLARE(swapon, swapon_fn);
EVENTHANDLER_DECLARE(swapoff, swapoff_fn);
/* ifup/ifdown events */
#define IFNET_EVENT_UP 0
#define IFNET_EVENT_DOWN 1
struct ifnet;
typedef void (*ifnet_event_fn)(void *, struct ifnet *ifp, int event);
EVENTHANDLER_DECLARE(ifnet_event, ifnet_event_fn);
#endif /* _SYS_EVENTHANDLER_H_ */