Re: [PATCH net-next RFC v4 10/15] net/mlx5: Add support for devlink reload action fw activate

Jiri Pirko
2020-09-14T13:56:11Z

Mon, Sep 14, 2020 at 08:07:57AM CEST, moshe@mellanox.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@mellanox.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
>