From: Dan Carpenter <dan.carpenter@xxxxxxxxxx> Date: Fri, 3 Jul 2015 14:28:47 +0300 > 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. Agreed. _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
