Re: [PATCH RFC] flow_dissector: Add FLOW_DISSECTOR_F_FLOWER

This patch is RFC and would be applied after "flow_dissector:
Protocol specific flow dissector offload"

In order to maitain uAPI in flower, the FLOW_DISSECTOR_F_FLOWER flag
is added to indicate to flow_dissector that the caller is flower.
As new funtionality is addes to flow_dissector that would break
the flower uAPI, the code can be wrapped in "if (!(flags &
FLOW_DISSECTOR_F_FLOWER)).

In this patch the conditional is use around protocol specific
dissection (e.g. DPI into VXLAN) as well as the code that
enforces a depth of parsing to prevent DPI. The latter was a
recent patch that would introduce a parsing limit to flower that
did not exist before (i.e. would break uAPI).

Signed-off-by: Tom Herbert <redacted>
---
include/net/flow_dissector.h |  1 +
net/core/flow_dissector.c    | 17 +++++++++++------
net/sched/cls_flow.c         |  3 ++-
3 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/include/net/flow_dissector.h b/include/net/flow_dissector.h
index ad75bbfd1c9c..ca315107d147 100644
--- a/include/net/flow_dissector.h
+++ b/include/net/flow_dissector.h

@@ -214,6 +214,7 @@ enum flow_dissector_key_id {

#define FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL	BIT(2)
#define FLOW_DISSECTOR_F_STOP_AT_ENCAP		BIT(3)
#define FLOW_DISSECTOR_F_STOP_AT_L4		BIT(4)
+#define FLOW_DISSECTOR_F_FLOWER			BIT(5)