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net: flow_dissector: fix RPS on DSA masters

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After the blamed patch, __skb_flow_dissect() on the DSA master stopped
adjusting for the length of the DSA headers. This is because it was told
to adjust only if the needed_headroom is zero, aka if there is no DSA
header. Of course, the adjustment should be done only if there _is_ a
DSA header.

Modify the comment too so it is clearer.

Fixes: 4e50025129 ("net: dsa: generalize overhead for taggers that use both headers and trailers")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vladimir Oltean 2021-06-14 16:58:19 +03:00 committed by David S. Miller
parent 3009e8aa85
commit ec13357263
1 changed files with 2 additions and 2 deletions
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4
net/core/flow_dissector.c
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@ -943,8 +943,8 @@ bool __skb_flow_dissect(const struct net *net,
int offset = 0;
ops = skb->dev->dsa_ptr->tag_ops;
/* Tail taggers don't break flow dissection */
if (!ops->needed_headroom) {
/* Only DSA header taggers break flow dissection */
if (ops->needed_headroom) {
if (ops->flow_dissect)
ops->flow_dissect(skb, &proto, &offset);
else