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Date:   Tue, 17 Mar 2020 20:47:24 +0530
From:   Vasundhara Volam <vasundhara-v.volam@...adcom.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, Pavan Chebbi <pavan.chebbi@...adcom.com>,
        Jiri Pirko <jiri@...lanox.com>,
        Vasundhara Volam <vasundhara-v.volam@...adcom.com>,
        Michael Chan <michael.chan@...adcom.com>
Subject: [PATCH net-next 09/11] devlink: Add new enable_ecn generic device param

From: Pavan Chebbi <pavan.chebbi@...adcom.com>

Add new device parameter to enable/disable handling of Explicit
Congestion Notification(ECN) in the device.

This patch also addresses comments from Jiri Pirko, to update the
devlink-info.rst documentation.

Cc: Jiri Pirko <jiri@...lanox.com>
Signed-off-by: Pavan Chebbi <pavan.chebbi@...adcom.com>
Signed-off-by: Vasundhara Volam <vasundhara-v.volam@...adcom.com>
Signed-off-by: Michael Chan <michael.chan@...adcom.com>
---
 Documentation/networking/devlink/devlink-params.rst | 5 +++++
 include/net/devlink.h                               | 4 ++++
 net/core/devlink.c                                  | 5 +++++
 3 files changed, 14 insertions(+)

diff --git a/Documentation/networking/devlink/devlink-params.rst b/Documentation/networking/devlink/devlink-params.rst
index da2f85c..0e6c965 100644
--- a/Documentation/networking/devlink/devlink-params.rst
+++ b/Documentation/networking/devlink/devlink-params.rst
@@ -106,3 +106,8 @@ own name.
    * - ``region_snapshot_enable``
      - Boolean
      - Enable capture of ``devlink-region`` snapshots.
+   * - ``enable_ecn``
+     - Boolean
+     - Enable handling of Explicit Congestion Notification(ECN) in the device.
+       When enabled hardware may set the code point to Congestion
+       Encountered(CE) before dropping the packet.
diff --git a/include/net/devlink.h b/include/net/devlink.h
index e130d24..825a8f9 100644
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -404,6 +404,7 @@ enum devlink_param_generic_id {
 	DEVLINK_PARAM_GENERIC_ID_FW_LOAD_POLICY,
 	DEVLINK_PARAM_GENERIC_ID_RESET_DEV_ON_DRV_PROBE,
 	DEVLINK_PARAM_GENERIC_ID_ENABLE_ROCE,
+	DEVLINK_PARAM_GENERIC_ID_ENABLE_ECN,
 
 	/* add new param generic ids above here*/
 	__DEVLINK_PARAM_GENERIC_ID_MAX,
@@ -441,6 +442,9 @@ enum devlink_param_generic_id {
 #define DEVLINK_PARAM_GENERIC_ENABLE_ROCE_NAME "enable_roce"
 #define DEVLINK_PARAM_GENERIC_ENABLE_ROCE_TYPE DEVLINK_PARAM_TYPE_BOOL
 
+#define DEVLINK_PARAM_GENERIC_ENABLE_ECN_NAME "enable_ecn"
+#define DEVLINK_PARAM_GENERIC_ENABLE_ECN_TYPE DEVLINK_PARAM_TYPE_BOOL
+
 #define DEVLINK_PARAM_GENERIC(_id, _cmodes, _get, _set, _validate)	\
 {									\
 	.id = DEVLINK_PARAM_GENERIC_ID_##_id,				\
diff --git a/net/core/devlink.c b/net/core/devlink.c
index f51bebc..116d887 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -3012,6 +3012,11 @@ static int devlink_nl_cmd_flash_update(struct sk_buff *skb,
 		.name = DEVLINK_PARAM_GENERIC_ENABLE_ROCE_NAME,
 		.type = DEVLINK_PARAM_GENERIC_ENABLE_ROCE_TYPE,
 	},
+	{
+		.id = DEVLINK_PARAM_GENERIC_ID_ENABLE_ECN,
+		.name = DEVLINK_PARAM_GENERIC_ENABLE_ECN_NAME,
+		.type = DEVLINK_PARAM_GENERIC_ENABLE_ECN_TYPE,
+	},
 };
 
 static int devlink_param_generic_verify(const struct devlink_param *param)
-- 
1.8.3.1

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