On Thu, Jul 02, 2015 at 01:17:35PM -0700, Haiyang Zhang wrote: > When packet encapsulation is in use, the MTU needs to be reduced for > headroom reservation. > The existing code takes the updated MTU value only from the host side. > But vSwitch extensions, such as Open vSwitch, require the flexibility > to change the MTU to different values from within a guest during the > lifecycle of a vNIC, when the encapsulation protocol is changed. The > patch supports this kind of MTU changes. > > Signed-off-by: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx> > Reviewed-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx> > --- > drivers/net/hyperv/netvsc_drv.c | 3 +-- > drivers/net/hyperv/rndis_filter.c | 2 +- > 2 files changed, 2 insertions(+), 3 deletions(-) > > diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c > index 358475e..68e7ece 100644 > --- a/drivers/net/hyperv/netvsc_drv.c > +++ b/drivers/net/hyperv/netvsc_drv.c > @@ -743,8 +743,7 @@ static int netvsc_change_mtu(struct net_device *ndev, int mtu) > if (nvdev->nvsp_version >= NVSP_PROTOCOL_VERSION_2) > limit = NETVSC_MTU - ETH_HLEN; > > - /* Hyper-V hosts don't support MTU < ETH_DATA_LEN (1500) */ > - if (mtu < ETH_DATA_LEN || mtu > limit) > + if (mtu < 68 || mtu > limit) How did you calculate 68? Avoid magic numbers like this, make it a define. regards, dan carpenter _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
