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Date:   Sun, 17 Jan 2021 10:02:19 +0200
From:   Ido Schimmel <idosch@...sch.org>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, petrm@...dia.com,
        jiri@...dia.com, amcohen@...dia.com, mlxsw@...dia.com,
        Ido Schimmel <idosch@...dia.com>
Subject: [PATCH net-next 1/5] devlink: Add ecn_mark trap

From: Petr Machata <petrm@...dia.com>

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

Signed-off-by: Amit Cohen <amcohen@...dia.com>
Reviewed-by: Jiri Pirko <jiri@...dia.com>
Signed-off-by: Petr Machata <petrm@...dia.com>
Signed-off-by: Ido Schimmel <idosch@...dia.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 d875f3e1e9cf..c6026b44617e 100644
--- a/Documentation/networking/devlink/devlink-trap.rst
+++ b/Documentation/networking/devlink/devlink-trap.rst
@@ -480,6 +480,10 @@ be added to the following table:
      - ``drop``
      - Traps packets that the device decided to drop in case they hit a
        blackhole nexthop
+   * - ``ecn_mark``
+     - ``drop``
+     - Traps ECN-capable packets that were marked with CE (Congestion
+       Encountered) code point by RED algorithm instead of being dropped
 
 Driver-specific Packet Traps
 ============================
diff --git a/include/net/devlink.h b/include/net/devlink.h
index f466819cc477..dd0c0b8fba6e 100644
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -836,6 +836,7 @@ enum devlink_trap_generic_id {
 	DEVLINK_TRAP_GENERIC_ID_GTP_PARSING,
 	DEVLINK_TRAP_GENERIC_ID_ESP_PARSING,
 	DEVLINK_TRAP_GENERIC_ID_BLACKHOLE_NEXTHOP,
+	DEVLINK_TRAP_GENERIC_ID_ECN_MARK,
 
 	/* Add new generic trap IDs above */
 	__DEVLINK_TRAP_GENERIC_ID_MAX,
@@ -1061,6 +1062,8 @@ enum devlink_trap_group_generic_id {
 	"esp_parsing"
 #define DEVLINK_TRAP_GENERIC_NAME_BLACKHOLE_NEXTHOP \
 	"blackhole_nexthop"
+#define DEVLINK_TRAP_GENERIC_NAME_ECN_MARK \
+	"ecn_mark"
 
 #define DEVLINK_TRAP_GROUP_GENERIC_NAME_L2_DROPS \
 	"l2_drops"
diff --git a/net/core/devlink.c b/net/core/devlink.c
index ee828e4b1007..f86688bfad46 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -9508,6 +9508,7 @@ static const struct devlink_trap devlink_trap_generic[] = {
 	DEVLINK_TRAP(GTP_PARSING, DROP),
 	DEVLINK_TRAP(ESP_PARSING, DROP),
 	DEVLINK_TRAP(BLACKHOLE_NEXTHOP, DROP),
+	DEVLINK_TRAP(ECN_MARK, DROP),
 };
 
 #define DEVLINK_TRAP_GROUP(_id)						      \
-- 
2.29.2

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