On Thu, 26 Jul 2018 14:21:08 -0700, Jakub Kicinski wrote:
> On Thu, 26 Jul 2018 10:40:45 -0700, Jeff Kirsher wrote:
> > From: Tony Nguyen <anthony.l.ngu...@intel.com>
> >
> > XDP does not support jumbo frames or LRO. These checks are being made
> > outside the driver when an XDP program is loaded, however, there is
> > nothing preventing these from changing after an XDP program is loaded.
> > Add the checks so that while an XDP program is loaded, do not allow MTU
> > to be changed or LRO to be enabled.
> >
> > Signed-off-by: Tony Nguyen <anthony.l.ngu...@intel.com>
> > Tested-by: Andrew Bowers <andrewx.bow...@intel.com>
> > Signed-off-by: Jeff Kirsher <jeffrey.t.kirs...@intel.com>
> > ---
> > drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 10 ++++++++++
> > 1 file changed, 10 insertions(+)
> >
> > diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> > b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> > index 5a6600f7b382..c42256e91997 100644
> > --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> > +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> > @@ -6469,6 +6469,11 @@ static int ixgbe_change_mtu(struct net_device
> > *netdev, int new_mtu)
> > {
> > struct ixgbe_adapter *adapter = netdev_priv(netdev);
> >
> > + if (adapter->xdp_prog) {
> > + e_warn(probe, "MTU cannot be changed while XDP program is
> > loaded\n");
> > + return -EPERM;
>
> EPERM looks wrong, EINVAL is common. Also most drivers will just check
> the bounds like you do in ixgbe_xdp_setup(), allowing the change if new
> MTU still fits constraints.
>
> FWIW are the IXGBE_FLAG_SRIOV_ENABLED and IXGBE_FLAG_DCB_ENABLED flag
> changes also covered while xdp is enabled? Quick grep doesn't reveal
> them being checked against xdp_prog other than in ixgbe_xdp_setup().
Ah, I didn't make the review in time :) Could you follow up?
