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

[Stephen Hemminger]

From: Stephen Hemminger <step...@networkplumber.org>

In case of XDP errors report error string through extack.

Signed-off-by: Stephen Hemminger <step...@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