Re: [PATCH v2 net-next 1/4] devlink: Add new "allow_fw_live_reset" generic device parameter.

From: Jiri Pirko <jiri@resnulli.us>
To: Vasundhara Volam <vasundhara-v.volam@broadcom.com>
Cc: David Miller <davem@davemloft.net>,
	Netdev <netdev@vger.kernel.org>, Jiri Pirko <jiri@mellanox.com>,
	Michael Chan <michael.chan@broadcom.com>
Subject: Re: [PATCH v2 net-next 1/4] devlink: Add new "allow_fw_live_reset" generic device parameter.
Date: Mon, 25 May 2020 19:26:02 +0200	[thread overview]
Message-ID: <20200525172602.GA14161@nanopsycho> (raw)
In-Reply-To: <CAACQVJpbXSnf0Gc5HehFc6KzKjZU7dV5tY9cwR72pBhweVRkFw@mail.gmail.com>

Sun, May 24, 2020 at 08:29:56AM CEST, vasundhara-v.volam@broadcom.com wrote:
>On Sun, May 24, 2020 at 10:23 AM Jiri Pirko <jiri@resnulli.us> wrote:
>>
>> Sat, May 23, 2020 at 08:08:22AM CEST, vasundhara-v.volam@broadcom.com wrote:
>> >Add a new "allow_fw_live_reset" generic device bool parameter. When
>> >parameter is set, user is allowed to reset the firmware in real time.
>> >
>> >This parameter is employed to communicate user consent or dissent for
>> >the live reset to happen. A separate command triggers the actual live
>> >reset.
>> >
>> >Cc: Jiri Pirko <jiri@mellanox.com>
>> >Signed-off-by: Vasundhara Volam <vasundhara-v.volam@broadcom.com>
>> >Signed-off-by: Michael Chan <michael.chan@broadcom.com>
>> >---
>> >v2: Rename param name to "allow_fw_live_reset" from
>> >"enable_hot_fw_reset".
>> >Update documentation for the param in devlink-params.rst file.
>> >---
>> > Documentation/networking/devlink/devlink-params.rst | 6 ++++++
>> > include/net/devlink.h                               | 4 ++++
>> > net/core/devlink.c                                  | 5 +++++
>> > 3 files changed, 15 insertions(+)
>> >
>> >diff --git a/Documentation/networking/devlink/devlink-params.rst b/Documentation/networking/devlink/devlink-params.rst
>> >index d075fd0..ad54dfb 100644
>> >--- a/Documentation/networking/devlink/devlink-params.rst
>> >+++ b/Documentation/networking/devlink/devlink-params.rst
>> >@@ -108,3 +108,9 @@ own name.
>> >    * - ``region_snapshot_enable``
>> >      - Boolean
>> >      - Enable capture of ``devlink-region`` snapshots.
>> >+   * - ``allow_fw_live_reset``
>> >+     - Boolean
>> >+     - Firmware live reset allows users to reset the firmware in real time.
>> >+       For example, after firmware upgrade, this feature can immediately reset
>> >+       to run the new firmware without reloading the driver or rebooting the
>>
>> This does not tell me anything about the reset being done on another
>> host. You need to emhasize that, in the name of the param too.
>I am not sure if I completely understand your query.
>
>Reset is actually initiated by one of the PF/host of the device, which
>resets the entire same device.
>
>Reset is not initiated by any other remote device/host.

Well, in case of multihost system, it might be, right?

>
>Thanks,
>Vasundhara
>>
>>
>>
>> >+       system.
>> >diff --git a/include/net/devlink.h b/include/net/devlink.h
>> >index 8ffc1b5c..488b61c 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_ALLOW_FW_LIVE_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_ALLOW_FW_LIVE_RESET_NAME "allow_fw_live_reset"
>> >+#define DEVLINK_PARAM_GENERIC_ALLOW_FW_LIVE_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..8544f23 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_ALLOW_FW_LIVE_RESET,
>> >+              .name = DEVLINK_PARAM_GENERIC_ALLOW_FW_LIVE_RESET_NAME,
>> >+              .type = DEVLINK_PARAM_GENERIC_ALLOW_FW_LIVE_RESET_TYPE,
>> >+      },
>> > };
>> >
>> > static int devlink_param_generic_verify(const struct devlink_param *param)
>> >--
>> >1.8.3.1
>> >