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Add the SIOCSIFMTU ioctl handling directly to tap(4) permitting it to

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have its MTU set higher than 1500 (ETHERMTU).  Its new limit is now
65535 as enforced by ifhwioctl() in if.c

This allows a tap(4) device to be added to a bridge, which requires all
interface members to have the same MTU, with an interface configured for
jumbo frames.  QEMU may now connect to a network via tap(4) without
requiring the real interface to have its MTU set to 1500 or lower.

Reviewed by:	rpaulo, bms
MFC after:	1 week
This commit is contained in:
scf 2009-03-16 03:11:02 +00:00
parent eb1d81774b
commit c01f39de6f
1 changed files with 7 additions and 0 deletions
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7
sys/net/if_tap.c
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@ -600,6 +600,7 @@ static int
tapifioctl(struct ifnet *ifp, u_long cmd, caddr_t data) tapifioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{ {
struct tap_softc *tp = ifp->if_softc; struct tap_softc *tp = ifp->if_softc;
struct ifreq *ifr = (struct ifreq *)data;
struct ifstat *ifs = NULL; struct ifstat *ifs = NULL;
int s, dummy; int s, dummy;
@ -609,6 +610,12 @@ tapifioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
case SIOCDELMULTI: case SIOCDELMULTI:
break; break;
case SIOCSIFMTU:
s = splimp();
ifp->if_mtu = ifr->ifr_mtu;
splx(s);
break;
case SIOCGIFSTATUS: case SIOCGIFSTATUS:
s = splimp(); s = splimp();
ifs = (struct ifstat *)data; ifs = (struct ifstat *)data;