path: root/drivers/net/ethernet/cavium
diff options
authorMatteo Croce <mcroce@redhat.com>2019-04-11 12:26:33 +0200
committerDavid S. Miller <davem@davemloft.net>2019-04-11 11:10:34 -0700
commit1f227d16083b2e280b7dde4ca78883d75593f2fd (patch)
tree607673dfc7cbfa106a6ae87456502a475c9beee8 /drivers/net/ethernet/cavium
parentnet: thunderx: raise XDP MTU to 1508 (diff)
net: thunderx: don't allow jumbo frames with XDP
The thunderx driver forbids to load an eBPF program if the MTU is too high, but this can be circumvented by loading the eBPF, then raising the MTU. Fix this by limiting the MTU if an eBPF program is already loaded. Fixes: 05c773f52b96e ("net: thunderx: Add basic XDP support") Signed-off-by: Matteo Croce <mcroce@redhat.com> Acked-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/cavium')
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_main.c b/drivers/net/ethernet/cavium/thunder/nicvf_main.c
index debc8c861c6b..c032bef1b776 100644
--- a/drivers/net/ethernet/cavium/thunder/nicvf_main.c
+++ b/drivers/net/ethernet/cavium/thunder/nicvf_main.c
@@ -1589,6 +1589,15 @@ static int nicvf_change_mtu(struct net_device *netdev, int new_mtu)
struct nicvf *nic = netdev_priv(netdev);
int orig_mtu = netdev->mtu;
+ /* For now just support only the usual MTU sized frames,
+ * plus some headroom for VLAN, QinQ.
+ */
+ if (nic->xdp_prog && new_mtu > MAX_XDP_MTU) {
+ netdev_warn(netdev, "Jumbo frames not yet supported with XDP, current MTU %d.\n",
+ netdev->mtu);
+ return -EINVAL;
+ }
netdev->mtu = new_mtu;
if (!netif_running(netdev))