i40e: Log error for oversized MTU on device

When attempting to link XDP prog with MTU larger than supported,
user is not informed why XDP linking fails. Adding proper
error message: "MTU too large to enable XDP".

Signed-off-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Signed-off-by: Eryk Rybak <eryk.roch.rybak@intel.com>
Tested-by: Kiran Bhandare <kiranx.bhandare@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 521ea9d..3e24168 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -12448,9 +12448,10 @@ out_err:
  * i40e_xdp_setup - add/remove an XDP program
  * @vsi: VSI to changed
  * @prog: XDP program
+ * @extack: netlink extended ack
  **/
-static int i40e_xdp_setup(struct i40e_vsi *vsi,
-                         struct bpf_prog *prog)
+static int i40e_xdp_setup(struct i40e_vsi *vsi, struct bpf_prog *prog,
+                         struct netlink_ext_ack *extack)
 {
        int frame_size = vsi->netdev->mtu + ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN;
        struct i40e_pf *pf = vsi->back;
@@ -12459,8 +12460,10 @@ static int i40e_xdp_setup(struct i40e_vsi *vsi,
        int i;
 
        /* Don't allow frames that span over multiple buffers */
-       if (frame_size > vsi->rx_buf_len)
+       if (frame_size > vsi->rx_buf_len) {
+               NL_SET_ERR_MSG_MOD(extack, "MTU too large to enable XDP");
                return -EINVAL;
+       }
 
        if (!i40e_enabled_xdp_vsi(vsi) && !prog)
                return 0;
@@ -12769,7 +12772,7 @@ static int i40e_xdp(struct net_device *dev,
 
        switch (xdp->command) {
        case XDP_SETUP_PROG:
-               return i40e_xdp_setup(vsi, xdp->prog);
+               return i40e_xdp_setup(vsi, xdp->prog, xdp->extack);
        case XDP_SETUP_XSK_POOL:
                return i40e_xsk_pool_setup(vsi, xdp->xsk.pool,
                                           xdp->xsk.queue_id);