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Date:   Mon,  3 Aug 2020 19:11:33 +0300
From:   Ido Schimmel <idosch@...sch.org>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, jiri@...lanox.com,
        petrm@...lanox.com, amitc@...lanox.com, mlxsw@...lanox.com,
        Ido Schimmel <idosch@...lanox.com>
Subject: [PATCH net-next 1/9] devlink: Add early_drop trap

From: Amit Cohen <amitc@...lanox.com>

Add the packet trap that can report packets that were ECN marked due to RED
AQM.

Signed-off-by: Amit Cohen <amitc@...lanox.com>
Signed-off-by: Petr Machata <petrm@...lanox.com>
Reviewed-by: Jiri Pirko <jiri@...lanox.com>
Signed-off-by: Ido Schimmel <idosch@...lanox.com>
---
 Documentation/networking/devlink/devlink-trap.rst | 4 ++++
 include/net/devlink.h                             | 3 +++
 net/core/devlink.c                                | 1 +
 3 files changed, 8 insertions(+)

diff --git a/Documentation/networking/devlink/devlink-trap.rst b/Documentation/networking/devlink/devlink-trap.rst
index 2014307fbe63..7a798352b45d 100644
--- a/Documentation/networking/devlink/devlink-trap.rst
+++ b/Documentation/networking/devlink/devlink-trap.rst
@@ -405,6 +405,10 @@ be added to the following table:
      - ``control``
      - Traps packets logged during processing of flow action trap (e.g., via
        tc's trap action)
+   * - ``early_drop``
+     - ``drop``
+     - Traps packets dropped due to the RED (Random Early Detection) algorithm
+       (i.e., early drops)
 
 Driver-specific Packet Traps
 ============================
diff --git a/include/net/devlink.h b/include/net/devlink.h
index 0606967cb501..fd3ae0760492 100644
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -703,6 +703,7 @@ enum devlink_trap_generic_id {
 	DEVLINK_TRAP_GENERIC_ID_PTP_GENERAL,
 	DEVLINK_TRAP_GENERIC_ID_FLOW_ACTION_SAMPLE,
 	DEVLINK_TRAP_GENERIC_ID_FLOW_ACTION_TRAP,
+	DEVLINK_TRAP_GENERIC_ID_EARLY_DROP,
 
 	/* Add new generic trap IDs above */
 	__DEVLINK_TRAP_GENERIC_ID_MAX,
@@ -891,6 +892,8 @@ enum devlink_trap_group_generic_id {
 	"flow_action_sample"
 #define DEVLINK_TRAP_GENERIC_NAME_FLOW_ACTION_TRAP \
 	"flow_action_trap"
+#define DEVLINK_TRAP_GENERIC_NAME_EARLY_DROP \
+	"early_drop"
 
 #define DEVLINK_TRAP_GROUP_GENERIC_NAME_L2_DROPS \
 	"l2_drops"
diff --git a/net/core/devlink.c b/net/core/devlink.c
index 5fdebb7289e9..bde4c29a30bc 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -8801,6 +8801,7 @@ static const struct devlink_trap devlink_trap_generic[] = {
 	DEVLINK_TRAP(PTP_GENERAL, CONTROL),
 	DEVLINK_TRAP(FLOW_ACTION_SAMPLE, CONTROL),
 	DEVLINK_TRAP(FLOW_ACTION_TRAP, CONTROL),
+	DEVLINK_TRAP(EARLY_DROP, DROP),
 };
 
 #define DEVLINK_TRAP_GROUP(_id)						      \
-- 
2.26.2

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