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Date:   Sun, 31 May 2020 12:33:40 +0530
From:   Vasundhara Volam <vasundhara-v.volam@...adcom.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, michael.chan@...adcom.com,
        Vasundhara Volam <vasundhara-v.volam@...adcom.com>,
        Jiri Pirko <jiri@...lanox.com>,
        Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH v3 net-next 1/6] devlink: Add 'enable_live_dev_reset' generic parameter.

This parameter controls the device's live reset capability. When
enabled, a user can issue a separate command like 'ethtool --reset'
or 'devlink dev reload' to reset the entire device in real time.

This parameter can be useful, if the user wants to upgrade the
firmware quickly with a momentary network outage.

For example, if a user flashes a new firmware image and if this
parameter is enabled, the user can immediately initiate reset of
the device, to load the new firmware without reloading the driver
manually or resetting the system.

Cc: Jiri Pirko <jiri@...lanox.com>
Cc: Jakub Kicinski <kuba@...nel.org>
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 | 8 ++++++++
 include/net/devlink.h                               | 4 ++++
 net/core/devlink.c                                  | 5 +++++
 3 files changed, 17 insertions(+)

diff --git a/Documentation/networking/devlink/devlink-params.rst b/Documentation/networking/devlink/devlink-params.rst
index d075fd0..8e12c83 100644
--- a/Documentation/networking/devlink/devlink-params.rst
+++ b/Documentation/networking/devlink/devlink-params.rst
@@ -108,3 +108,11 @@ own name.
    * - ``region_snapshot_enable``
      - Boolean
      - Enable capture of ``devlink-region`` snapshots.
+   * - ``enable_live_dev_reset``
+     - Boolean
+     - Controls the device's live reset capability. When the parameter is true,
+       the user can use a separate command to reset the entire device in real
+       time, that resets the firmware and driver entities.
+       For example, after flashing a new firmware image, this feature allows the
+       user to initiate the reset immediately from a separate command, to load
+       the new firmware without reloading the driver or resetting the system.
diff --git a/include/net/devlink.h b/include/net/devlink.h
index 8ffc1b5c..eb28fa1 100644
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -406,6 +406,7 @@ 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_LIVE_DEV_RESET,
 
 	/* add new param generic ids above here*/
 	__DEVLINK_PARAM_GENERIC_ID_MAX,
@@ -443,6 +444,9 @@ 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_LIVE_DEV_RESET_NAME "enable_live_dev_reset"
+#define DEVLINK_PARAM_GENERIC_ENABLE_LIVE_DEV_RESET_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 7b76e5f..7b52b38 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -3011,6 +3011,11 @@ 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_LIVE_DEV_RESET,
+		.name = DEVLINK_PARAM_GENERIC_ENABLE_LIVE_DEV_RESET_NAME,
+		.type = DEVLINK_PARAM_GENERIC_ENABLE_LIVE_DEV_RESET_TYPE,
+	},
 };
 
 static int devlink_param_generic_verify(const struct devlink_param *param)
-- 
1.8.3.1

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