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xdp: remove net_device names from xdp_redirect tracepoint

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There is too much overhead in the current trace_xdp_redirect
tracepoint as it does strcpy and strlen on the net_device names.

Besides, exposing the ifindex/index is actually the information that
is needed in the tracepoint to diagnose issues.  When a lookup fails
(either ifindex or devmap index) then there is a need for saying which
to_index that have issues.

V2: Adjust args to be aligned with trace_xdp_exception.

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jesper Dangaard Brouer
2017-08-24 12:33:18 +02:00
committed by David S. Miller
parent 2886447dc5
commit a873585587
2 changed files with 15 additions and 15 deletions
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6
net/core/filter.c
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@@ -2524,7 +2524,7 @@ static int xdp_do_redirect_map(struct net_device *dev, struct xdp_buff *xdp,
if (likely(!err))
ri->map_to_flush = map;
out:
trace_xdp_redirect(dev, fwd, xdp_prog, XDP_REDIRECT, err);
trace_xdp_redirect(dev, xdp_prog, XDP_REDIRECT, index, err);
return err;
}
@@ -2548,7 +2548,7 @@ int xdp_do_redirect(struct net_device *dev, struct xdp_buff *xdp,
err = __bpf_tx_xdp(fwd, NULL, xdp, 0);
out:
trace_xdp_redirect(dev, fwd, xdp_prog, XDP_REDIRECT, err);
trace_xdp_redirect(dev, xdp_prog, XDP_REDIRECT, index, err);
return err;
}
EXPORT_SYMBOL_GPL(xdp_do_redirect);
@@ -2582,7 +2582,7 @@ int xdp_do_generic_redirect(struct net_device *dev, struct sk_buff *skb,
skb->dev = fwd;
out:
trace_xdp_redirect(dev, fwd, xdp_prog, XDP_REDIRECT, err);
trace_xdp_redirect(dev, xdp_prog, XDP_REDIRECT, index, err);
return err;
}
EXPORT_SYMBOL_GPL(xdp_do_generic_redirect);