netdev - Re: [PATCH v2 net-next 1/4] devlink: Add new "allow_fw_live

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Message-ID: <CAACQVJpbXSnf0Gc5HehFc6KzKjZU7dV5tY9cwR72pBhweVRkFw@mail.gmail.com>
Date:   Sun, 24 May 2020 11:59:56 +0530
From:   Vasundhara Volam <vasundhara-v.volam@...adcom.com>
To:     Jiri Pirko <jiri@...nulli.us>
Cc:     David Miller <davem@...emloft.net>,
        Netdev <netdev@...r.kernel.org>, Jiri Pirko <jiri@...lanox.com>,
        Michael Chan <michael.chan@...adcom.com>
Subject: Re: [PATCH v2 net-next 1/4] devlink: Add new "allow_fw_live_reset"
 generic device parameter.

On Sun, May 24, 2020 at 10:23 AM Jiri Pirko <jiri@...nulli.us> wrote:
>
> Sat, May 23, 2020 at 08:08:22AM CEST, vasundhara-v.volam@...adcom.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@...lanox.com>
> >Signed-off-by: Vasundhara Volam <vasundhara-v.volam@...adcom.com>
> >Signed-off-by: Michael Chan <michael.chan@...adcom.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.

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
> >