[V3 PATCH net-next 1/5] xdp: remove bpf_warn_invalid_xdp_redirect

[Jesper Dangaard Brouer]

Given there is a tracepoint that can track the error code
of xdp_do_redirect calls, the WARN_ONCE in bpf_warn_invalid_xdp_redirect
doesn't seem relevant any longer.  Simply remove the function.

Signed-off-by: Jesper Dangaard Brouer <bro...@redhat.com>
Acked-by: Daniel Borkmann <dan...@iogearbox.net>
---
 net/core/filter.c |    8 --------
 1 file changed, 8 deletions(-)

diff --git a/net/core/filter.c b/net/core/filter.c
index 2a0d762a20d8..a5e5f31b41b9 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -2476,7 +2476,6 @@ static int __bpf_tx_xdp(struct net_device *dev,
        int err;
 
        if (!dev->netdev_ops->ndo_xdp_xmit) {
-               bpf_warn_invalid_xdp_redirect(dev->ifindex);
                return -EOPNOTSUPP;
        }
 
@@ -2543,7 +2542,6 @@ int xdp_do_redirect(struct net_device *dev, struct 
xdp_buff *xdp,
        fwd = dev_get_by_index_rcu(dev_net(dev), index);
        ri->ifindex = 0;
        if (unlikely(!fwd)) {
-               bpf_warn_invalid_xdp_redirect(index);
                err = -EINVAL;
                goto out;
        }
@@ -2564,7 +2562,6 @@ int xdp_do_generic_redirect(struct net_device *dev, 
struct sk_buff *skb)
        dev = dev_get_by_index_rcu(dev_net(dev), index);
        ri->ifindex = 0;
        if (unlikely(!dev)) {
-               bpf_warn_invalid_xdp_redirect(index);
                return -EINVAL;
        }
 
@@ -3565,11 +3562,6 @@ void bpf_warn_invalid_xdp_action(u32 act)
 }
 EXPORT_SYMBOL_GPL(bpf_warn_invalid_xdp_action);
 
-void bpf_warn_invalid_xdp_redirect(u32 ifindex)
-{
-       WARN_ONCE(1, "Illegal XDP redirect to unsupported device 
ifindex(%i)\n", ifindex);
-}
-
 static bool __is_valid_sock_ops_access(int off, int size)
 {
        if (off < 0 || off >= sizeof(struct bpf_sock_ops))