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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>
This commit is contained in:
Eryk Rybak 2021-01-14 16:17:06 +00:00 committed by Tony Nguyen
parent f020fa1a79
commit 613142b0bb
1 changed files with 7 additions and 4 deletions
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11
drivers/net/ethernet/intel/i40e/i40e_main.c
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@ -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);