Merge branch 'mlxsw-Add-support-for-buffer-drops-mirroring'

Petr Machata says:

====================
mlxsw: Add support for buffer drops mirroring

This set offloads the recently introduced qevent infrastructure in TC and
allows mlxsw to support mirroring of packets that were dropped due to
buffer related reasons (e.g., early drops) during forwarding.

Up until now mlxsw only supported mirroring that was either triggered by
per-port triggers (i.e., via matchall) or by the policy engine (i.e.,
via flower). Packets that are dropped due to buffer related reasons are
mirrored using a third type of trigger, a global trigger.

Global triggers are bound once to a mirroring (SPAN) agent and enabled
on a per-{port, TC} basis. This allows users, for example, to request
that only packets that were early dropped on a specific netdev to be
mirrored.

Patch set overview:

Patch #1 extends flow_block_offload and indirect offload structure to pass
a scheduler instead of a netdevice. That is necessary, because binding type
and netdevice are not a unique identifier of the block anymore.

Patches #2-#3 add the required registers to support above mentioned
functionality.

Patches #4-#6 gradually add support for global mirroring triggers.

Patch #7 adds support for enablement of global mirroring triggers.

Patches #8-#11 are cleanups in the flow offload code and shuffle some
code around to make the qevent offload easier.

Patch #12 implements offload of RED early_drop qevent.

Patch #13 extends the RED selftest for offloaded datapath to cover
early_drop qevent.

v2:
- Patch #1:
    - In struct flow_block_indr, track both sch and dev.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 3 deletions

diff --git a/include/net/flow_offload.h b/include/net/flow_offload.h
index de395498440d..9f88a7b730a8 100644
--- a/include/net/flow_offload.h
+++ b/include/net/flow_offload.h
@@ -444,6 +444,7 @@ struct flow_block_offload {
 	struct list_head cb_list;
 	struct list_head *driver_block_list;
 	struct netlink_ext_ack *extack;
+	struct Qdisc *sch;
 };
 
 enum tc_setup_type;
@@ -455,6 +456,7 @@ struct flow_block_cb;
 struct flow_block_indr {
 	struct list_head		list;
 	struct net_device		*dev;
+	struct Qdisc			*sch;
 	enum flow_block_binder_type	binder_type;
 	void				*data;
 	void				*cb_priv;
@@ -479,7 +481,8 @@ struct flow_block_cb *flow_indr_block_cb_alloc(flow_setup_cb_t *cb,
 					       void *cb_ident, void *cb_priv,
 					       void (*release)(void *cb_priv),
 					       struct flow_block_offload *bo,
-					       struct net_device *dev, void *data,
+					       struct net_device *dev,
+					       struct Qdisc *sch, void *data,
 					       void *indr_cb_priv,
 					       void (*cleanup)(struct flow_block_cb *block_cb));
 void flow_block_cb_free(struct flow_block_cb *block_cb);
@@ -553,7 +556,7 @@ static inline void flow_block_init(struct flow_block *flow_block)
 	INIT_LIST_HEAD(&flow_block->cb_list);
 }
 
-typedef int flow_indr_block_bind_cb_t(struct net_device *dev, void *cb_priv,
+typedef int flow_indr_block_bind_cb_t(struct net_device *dev, struct Qdisc *sch, void *cb_priv,
 				      enum tc_setup_type type, void *type_data,
 				      void *data,
 				      void (*cleanup)(struct flow_block_cb *block_cb));
@@ -561,7 +564,7 @@ typedef int flow_indr_block_bind_cb_t(struct net_device *dev, void *cb_priv,
 int flow_indr_dev_register(flow_indr_block_bind_cb_t *cb, void *cb_priv);
 void flow_indr_dev_unregister(flow_indr_block_bind_cb_t *cb, void *cb_priv,
 			      void (*release)(void *cb_priv));
-int flow_indr_dev_setup_offload(struct net_device *dev,
+int flow_indr_dev_setup_offload(struct net_device *dev, struct Qdisc *sch,
 				enum tc_setup_type type, void *data,
 				struct flow_block_offload *bo,
 				void (*cleanup)(struct flow_block_cb *block_cb));