[Intel-wired-lan][PATCH iwl-net 1/2] idpf: do not enable XDP if queue based scheduling is not supported

[Joshua Hay <joshua.a.hay@intel.com>]

The current XDP implementation uses queue based scheduling for its TxQs.
If the FW does not advertise support for queue based scheduling, do not
enable XDP. Add the missing capability check at the start of the XDP
configuration. This will temporarily break XDP while a flow based
implementation is worked on, as well as while FWs with queue based by
default are rolled out.

Fixes: 705457e7211f ("idpf: implement XDP_SETUP_PROG in ndo_bpf for splitq")
Signed-off-by: Joshua Hay <joshua.a.hay@intel.com>
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Reviewed-by: Madhu Chittim <madhu.chittim@intel.com>
---
 drivers/net/ethernet/intel/idpf/xdp.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/ethernet/intel/idpf/xdp.c b/drivers/net/ethernet/intel/idpf/xdp.c
index 18a6e7062863..9c3bdb193684 100644
--- a/drivers/net/ethernet/intel/idpf/xdp.c
+++ b/drivers/net/ethernet/intel/idpf/xdp.c
@@ -511,6 +511,13 @@ int idpf_xdp(struct net_device *dev, struct netdev_bpf *xdp)
 	if (!idpf_is_queue_model_split(vport->dflt_qv_rsrc.txq_model))
 		goto notsupp;
 
+	if (!idpf_is_cap_ena(vport->adapter, IDPF_OTHER_CAPS,
+			     VIRTCHNL2_CAP_SPLITQ_QSCHED)) {
+		NL_SET_ERR_MSG_MOD(xdp->extack,
+				   "Device does not support requested XDP Tx scheduling mode");
+		goto notsupp;
+	}
+
 	switch (xdp->command) {
 	case XDP_SETUP_PROG:
 		ret = idpf_xdp_setup_prog(vport, xdp);
-- 
2.39.2