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Date:   Mon, 14 Sep 2020 15:52:51 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Moshe Shemesh <moshe@...lanox.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jiri Pirko <jiri@...lanox.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next RFC v4 10/15] net/mlx5: Add support for devlink
 reload action fw activate

Mon, Sep 14, 2020 at 08:07:57AM CEST, moshe@...lanox.com wrote:
>Add support for devlink reload action fw_activate. To activate firmware
>image the mlx5 driver resets the firmware and reloads it from flash. If
>a new image was stored on flash it will be loaded. Once this reload
>command is executed the driver initiates fw sync reset flow, where the
>firmware synchronizes all PFs on coming reset and driver reload.
>
>Signed-off-by: Moshe Shemesh <moshe@...lanox.com>
>---
>v3 -> v4:
>- Renamed actions_done to actions_performed
>v2 -> v3:
>- Return the reload actions done
>- Update reload action counters if reset initiated by remote host
>v1 -> v2:
>- Have fw_activate action instead of fw_reset level
>---
> .../net/ethernet/mellanox/mlx5/core/devlink.c | 62 ++++++++++++++++---
> .../ethernet/mellanox/mlx5/core/fw_reset.c    | 60 ++++++++++++++++--
> .../ethernet/mellanox/mlx5/core/fw_reset.h    |  1 +
> 3 files changed, 109 insertions(+), 14 deletions(-)
>
>diff --git a/drivers/net/ethernet/mellanox/mlx5/core/devlink.c b/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
>index f6b29deaf02e..fa8f6abbea4e 100644
>--- a/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
>+++ b/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
>@@ -4,6 +4,7 @@
> #include <devlink.h>
> 
> #include "mlx5_core.h"
>+#include "fw_reset.h"
> #include "fs_core.h"
> #include "eswitch.h"
> 
>@@ -88,6 +89,32 @@ mlx5_devlink_info_get(struct devlink *devlink, struct devlink_info_req *req,
> 	return 0;
> }
> 
>+static int mlx5_devlink_reload_fw_activate(struct devlink *devlink, struct netlink_ext_ack *extack)
>+{
>+	struct mlx5_core_dev *dev = devlink_priv(devlink);
>+	u8 reset_level, reset_type, net_port_alive;
>+	int err;
>+
>+	err = mlx5_reg_mfrl_query(dev, &reset_level, &reset_type);
>+	if (err)
>+		return err;
>+	if (!(reset_level & MLX5_MFRL_REG_RESET_LEVEL3)) {
>+		NL_SET_ERR_MSG_MOD(extack, "FW activate requires reboot");
>+		return -EINVAL;
>+	}
>+
>+	net_port_alive = !!(reset_type & MLX5_MFRL_REG_RESET_TYPE_NET_PORT_ALIVE);
>+	err = mlx5_fw_set_reset_sync(dev, net_port_alive);
>+	if (err)
>+		goto out;
>+
>+	err = mlx5_fw_wait_fw_reset_done(dev);
>+out:
>+	if (err)
>+		NL_SET_ERR_MSG_MOD(extack, "FW activate command failed");
>+	return err;
>+}
>+
> static int mlx5_devlink_reload_down(struct devlink *devlink, bool netns_change,
> 				    enum devlink_reload_action action,
> 				    enum devlink_reload_action_limit_level limit_level,
>@@ -95,8 +122,17 @@ static int mlx5_devlink_reload_down(struct devlink *devlink, bool netns_change,
> {
> 	struct mlx5_core_dev *dev = devlink_priv(devlink);
> 
>-	mlx5_unload_one(dev, false);
>-	return 0;
>+	switch (action) {
>+	case DEVLINK_RELOAD_ACTION_DRIVER_REINIT:
>+		mlx5_unload_one(dev, false);
>+		return 0;
>+	case DEVLINK_RELOAD_ACTION_FW_ACTIVATE:
>+		return mlx5_devlink_reload_fw_activate(devlink, extack);
>+	default:
>+		/* Unsupported action should not get to this function */
>+		WARN_ON(1);
>+		return -EOPNOTSUPP;
>+	}
> }
> 
> static int mlx5_devlink_reload_up(struct devlink *devlink, enum devlink_reload_action action,
>@@ -104,13 +140,22 @@ static int mlx5_devlink_reload_up(struct devlink *devlink, enum devlink_reload_a
> 				  struct netlink_ext_ack *extack, unsigned long *actions_performed)
> {
> 	struct mlx5_core_dev *dev = devlink_priv(devlink);
>-	int err;
> 
>-	err = mlx5_load_one(dev, false);
>-	if (err)
>-		return err;
> 	if (actions_performed)
>-		*actions_performed = BIT(DEVLINK_RELOAD_ACTION_DRIVER_REINIT);
>+		*actions_performed = BIT(action);
>+
>+	switch (action) {
>+	case DEVLINK_RELOAD_ACTION_DRIVER_REINIT:
>+	case DEVLINK_RELOAD_ACTION_FW_ACTIVATE:
>+		/* On fw_activate action, also driver is reloaded and reinit performed */
>+		if (actions_performed)
>+			*actions_performed |= BIT(DEVLINK_RELOAD_ACTION_DRIVER_REINIT);

You should set DEVLINK_RELOAD_ACTION_FW_ACTIVATE bit in actions_performed
upon activation.


>+		return mlx5_load_one(dev, false);
>+	default:
>+		/* Unsupported action should not get to this function */
>+		WARN_ON(1);
>+		return -EOPNOTSUPP;
>+	}
> 
> 	return 0;
> }
>@@ -128,7 +173,8 @@ static const struct devlink_ops mlx5_devlink_ops = {
> #endif
> 	.flash_update = mlx5_devlink_flash_update,
> 	.info_get = mlx5_devlink_info_get,
>-	.supported_reload_actions = BIT(DEVLINK_RELOAD_ACTION_DRIVER_REINIT),
>+	.supported_reload_actions = BIT(DEVLINK_RELOAD_ACTION_DRIVER_REINIT) |
>+				    BIT(DEVLINK_RELOAD_ACTION_FW_ACTIVATE),
> 	.supported_reload_action_limit_levels = BIT(DEVLINK_RELOAD_ACTION_LIMIT_LEVEL_NONE),
> 	.reload_down = mlx5_devlink_reload_down,
> 	.reload_up = mlx5_devlink_reload_up,
>diff --git a/drivers/net/ethernet/mellanox/mlx5/core/fw_reset.c b/drivers/net/ethernet/mellanox/mlx5/core/fw_reset.c
>index 61237f4836cc..550f67b00473 100644
>--- a/drivers/net/ethernet/mellanox/mlx5/core/fw_reset.c
>+++ b/drivers/net/ethernet/mellanox/mlx5/core/fw_reset.c
>@@ -5,6 +5,7 @@
> 
> enum {
> 	MLX5_FW_RESET_FLAGS_RESET_REQUESTED,
>+	MLX5_FW_RESET_FLAGS_PENDING_COMP
> };
> 
> struct mlx5_fw_reset {
>@@ -17,6 +18,8 @@ struct mlx5_fw_reset {
> 	struct work_struct reset_abort_work;
> 	unsigned long reset_flags;
> 	struct timer_list timer;
>+	struct completion done;
>+	int ret;
> };
> 
> static int mlx5_reg_mfrl_set(struct mlx5_core_dev *dev, u8 reset_level,
>@@ -53,7 +56,14 @@ int mlx5_reg_mfrl_query(struct mlx5_core_dev *dev, u8 *reset_level, u8 *reset_ty
> 
> int mlx5_fw_set_reset_sync(struct mlx5_core_dev *dev, u8 reset_type_sel)
> {
>-	return mlx5_reg_mfrl_set(dev, MLX5_MFRL_REG_RESET_LEVEL3, reset_type_sel, 0, true);
>+	struct mlx5_fw_reset *fw_reset = dev->priv.fw_reset;
>+	int err;
>+
>+	set_bit(MLX5_FW_RESET_FLAGS_PENDING_COMP, &fw_reset->reset_flags);
>+	err =  mlx5_reg_mfrl_set(dev, MLX5_MFRL_REG_RESET_LEVEL3, reset_type_sel, 0, true);
>+	if (err)
>+		clear_bit(MLX5_FW_RESET_FLAGS_PENDING_COMP, &fw_reset->reset_flags);
>+	return err;
> }
> 
> int mlx5_fw_set_live_patch(struct mlx5_core_dev *dev)
>@@ -66,19 +76,36 @@ static int mlx5_fw_set_reset_sync_ack(struct mlx5_core_dev *dev)
> 	return mlx5_reg_mfrl_set(dev, MLX5_MFRL_REG_RESET_LEVEL3, 0, 1, false);
> }
> 
>+static void mlx5_fw_reset_complete_reload(struct mlx5_core_dev *dev)
>+{
>+	struct mlx5_fw_reset *fw_reset = dev->priv.fw_reset;
>+
>+	/* if this is the driver that initiated the fw reset, devlink completed the reload */
>+	if (test_bit(MLX5_FW_RESET_FLAGS_PENDING_COMP, &fw_reset->reset_flags)) {
>+		complete(&fw_reset->done);
>+	} else {
>+		mlx5_load_one(dev, false);
>+		devlink_reload_implicit_actions_performed(priv_to_devlink(dev),
>+							  DEVLINK_RELOAD_ACTION_LIMIT_LEVEL_NONE,
>+							  BIT(DEVLINK_RELOAD_ACTION_DRIVER_REINIT) |
>+							  BIT(DEVLINK_RELOAD_ACTION_FW_ACTIVATE));
>+	}
>+}
>+
> static void mlx5_sync_reset_reload_work(struct work_struct *work)
> {
> 	struct mlx5_fw_reset *fw_reset = container_of(work, struct mlx5_fw_reset,
> 						      reset_reload_work);
> 	struct mlx5_core_dev *dev = fw_reset->dev;
>+	int err;
> 
> 	mlx5_enter_error_state(dev, true);
> 	mlx5_unload_one(dev, false);
>-	if (mlx5_health_wait_pci_up(dev)) {
>+	err = mlx5_health_wait_pci_up(dev);
>+	if (err)
> 		mlx5_core_err(dev, "reset reload flow aborted, PCI reads still not working\n");
>-		return;
>-	}
>-	mlx5_load_one(dev, false);
>+	fw_reset->ret = err;
>+	mlx5_fw_reset_complete_reload(dev);
> }
> 
> static void mlx5_stop_sync_reset_poll(struct mlx5_core_dev *dev)
>@@ -264,7 +291,8 @@ static void mlx5_sync_reset_now_event(struct work_struct *work)
> done:
> 	if (err)
> 		mlx5_start_health_poll(dev);
>-	mlx5_load_one(dev, false);
>+	fw_reset->ret = err;
>+	mlx5_fw_reset_complete_reload(dev);
> }
> 
> static void mlx5_sync_reset_abort_event(struct work_struct *work)
>@@ -313,6 +341,25 @@ static int fw_reset_event_notifier(struct notifier_block *nb, unsigned long acti
> 	return NOTIFY_OK;
> }
> 
>+#define MLX5_FW_RESET_TIMEOUT_MSEC 5000
>+int mlx5_fw_wait_fw_reset_done(struct mlx5_core_dev *dev)
>+{
>+	unsigned long timeout = msecs_to_jiffies(MLX5_FW_RESET_TIMEOUT_MSEC);
>+	struct mlx5_fw_reset *fw_reset = dev->priv.fw_reset;
>+	int err;
>+
>+	if (!wait_for_completion_timeout(&fw_reset->done, timeout)) {
>+		mlx5_core_warn(dev, "FW sync reset timeout after %d seconds\n",
>+			       MLX5_FW_RESET_TIMEOUT_MSEC / 1000);
>+		err = -ETIMEDOUT;
>+		goto out;
>+	}
>+	err = fw_reset->ret;
>+out:
>+	clear_bit(MLX5_FW_RESET_FLAGS_PENDING_COMP, &fw_reset->reset_flags);
>+	return err;
>+}
>+
> int mlx5_fw_reset_events_init(struct mlx5_core_dev *dev)
> {
> 	struct mlx5_fw_reset *fw_reset = kzalloc(sizeof(*fw_reset), GFP_KERNEL);
>@@ -336,6 +383,7 @@ int mlx5_fw_reset_events_init(struct mlx5_core_dev *dev)
> 	MLX5_NB_INIT(&fw_reset->nb, fw_reset_event_notifier, GENERAL_EVENT);
> 	mlx5_eq_notifier_register(dev, &fw_reset->nb);
> 
>+	init_completion(&fw_reset->done);
> 	return 0;
> }
> 
>diff --git a/drivers/net/ethernet/mellanox/mlx5/core/fw_reset.h b/drivers/net/ethernet/mellanox/mlx5/core/fw_reset.h
>index 278f538ea92a..d7ee951a2258 100644
>--- a/drivers/net/ethernet/mellanox/mlx5/core/fw_reset.h
>+++ b/drivers/net/ethernet/mellanox/mlx5/core/fw_reset.h
>@@ -10,6 +10,7 @@ int mlx5_reg_mfrl_query(struct mlx5_core_dev *dev, u8 *reset_level, u8 *reset_ty
> int mlx5_fw_set_reset_sync(struct mlx5_core_dev *dev, u8 reset_type_sel);
> int mlx5_fw_set_live_patch(struct mlx5_core_dev *dev);
> 
>+int mlx5_fw_wait_fw_reset_done(struct mlx5_core_dev *dev);
> int mlx5_fw_reset_events_init(struct mlx5_core_dev *dev);
> void mlx5_fw_reset_events_cleanup(struct mlx5_core_dev *dev);
> 
>-- 
>2.17.1
>

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