[RFC 4/6] ixgebvf: report xdp errors through extack

[Stephen Hemminger <stephen@networkplumber.org>]

From: Stephen Hemminger <stephen@networkplumber.org>

In case of XDP errors report error string through extack.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
index 49e23afa05a2..2a3d96a20329 100644
--- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
+++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
@@ -4436,7 +4436,8 @@ ixgbevf_features_check(struct sk_buff *skb, struct net_device *dev,
 	return features;
 }
 
-static int ixgbevf_xdp_setup(struct net_device *dev, struct bpf_prog *prog)
+static int ixgbevf_xdp_setup(struct net_device *dev, struct bpf_prog *prog,
+			     struct netlink_ext_ack *extack)
 {
 	int i, frame_size = dev->mtu + ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN;
 	struct ixgbevf_adapter *adapter = netdev_priv(dev);
@@ -4446,8 +4447,11 @@ static int ixgbevf_xdp_setup(struct net_device *dev, struct bpf_prog *prog)
 	for (i = 0; i < adapter->num_rx_queues; i++) {
 		struct ixgbevf_ring *ring = adapter->rx_ring[i];
 
-		if (frame_size > ixgbevf_rx_bufsz(ring))
+		if (frame_size > ixgbevf_rx_bufsz(ring)) {
+			NL_SET_ERR_MSG(extack,
+				       "XDP does not support multiple buffers");
 			return -EINVAL;
+		}
 	}
 
 	old_prog = xchg(&adapter->xdp_prog, prog);
@@ -4483,12 +4487,13 @@ static int ixgbevf_xdp(struct net_device *dev, struct netdev_bpf *xdp)
 
 	switch (xdp->command) {
 	case XDP_SETUP_PROG:
-		return ixgbevf_xdp_setup(dev, xdp->prog);
+		return ixgbevf_xdp_setup(dev, xdp->prog, xdp->extack);
 	case XDP_QUERY_PROG:
 		xdp->prog_id = adapter->xdp_prog ?
 			       adapter->xdp_prog->aux->id : 0;
 		return 0;
 	default:
+		NL_SET_ERR_MSG(xdp->extack, "Unsupported XDP command");
 		return -EINVAL;
 	}
 }
-- 
2.17.1