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: cf7916084dece ("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>

diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_main.c b/drivers/net/ethernet/cavium/thunder/nicvf_main.c
index debc8c861c6bd930b906466e53c0ed289a6a234d..c032bef1b776d74ea4886e8fbddca40c8b7dd868 100644 (file)
--- 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))