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From:   Moshe Shemesh <moshe@mellanox.com>
To:     "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>
Cc:     Jiri Pirko <jiri@mellanox.com>, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org, Moshe Shemesh <moshe@mellanox.com>
Subject: [PATCH net-next RFC v3 13/14] net/mlx5: Add support for devlink reload action fw activate no reset
Date:   Sun, 30 Aug 2020 18:27:33 +0300
Message-Id: <1598801254-27764-14-git-send-email-moshe@mellanox.com>
In-Reply-To: <1598801254-27764-1-git-send-email-moshe@mellanox.com>
References: <1598801254-27764-1-git-send-email-moshe@mellanox.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Add support for devlink reload action fw_activation_no_reset which does
firmware live patching, updating the firmware image without reset.
The driver checks if the firmware is capable of handling the pending
firmware changes as a live patch. If it is then it triggers firmware
live patching flow.

Signed-off-by: Moshe Shemesh <moshe@mellanox.com>
---
v2 -> v3:
- Replace fw_live_patch action by fw_activate_no_reset
v1 -> v2:
- Have fw_live_patch action instead of level
---
 .../net/ethernet/mellanox/mlx5/core/devlink.c | 32 ++++++++++++++++++-
 1 file changed, 31 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/devlink.c b/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
index ea759bb2a120..bfdd3499f428 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
@@ -115,6 +115,29 @@ static int mlx5_devlink_reload_fw_activate(struct devlink *devlink, struct netli
 	return err;
 }
 
+static int mlx5_devlink_trigger_fw_live_patch(struct devlink *devlink,
+					      struct netlink_ext_ack *extack)
+{
+	struct mlx5_core_dev *dev = devlink_priv(devlink);
+	u8 reset_level;
+	int err;
+
+	err = mlx5_reg_mfrl_query(dev, &reset_level, NULL);
+	if (err)
+		return err;
+	if (!(reset_level & MLX5_MFRL_REG_RESET_LEVEL0)) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "FW upgrade to the stored FW can't be done by FW live patching");
+		return -EINVAL;
+	}
+
+	err = mlx5_fw_set_live_patch(dev);
+	if (err)
+		return err;
+
+	return 0;
+}
+
 static int mlx5_devlink_reload_down(struct devlink *devlink, bool netns_change,
 				    enum devlink_reload_action action,
 				    struct netlink_ext_ack *extack)
@@ -127,6 +150,8 @@ static int mlx5_devlink_reload_down(struct devlink *devlink, bool netns_change,
 		return 0;
 	case DEVLINK_RELOAD_ACTION_FW_ACTIVATE:
 		return mlx5_devlink_reload_fw_activate(devlink, extack);
+	case DEVLINK_RELOAD_ACTION_FW_ACTIVATE_NO_RESET:
+		return mlx5_devlink_trigger_fw_live_patch(devlink, extack);
 	default:
 		/* Unsupported action should not get to this function */
 		WARN_ON(1);
@@ -150,6 +175,10 @@ static int mlx5_devlink_reload_up(struct devlink *devlink, enum devlink_reload_a
 		if (actions_done)
 			*actions_done = BIT(action) | BIT(DEVLINK_RELOAD_ACTION_DRIVER_REINIT);
 		break;
+	case DEVLINK_RELOAD_ACTION_FW_ACTIVATE_NO_RESET:
+		if (actions_done)
+			*actions_done = BIT(action);
+		break;
 	default:
 		/* Unsupported action should not get to this function */
 		WARN_ON(1);
@@ -173,7 +202,8 @@ static const struct devlink_ops mlx5_devlink_ops = {
 	.flash_update = mlx5_devlink_flash_update,
 	.info_get = mlx5_devlink_info_get,
 	.supported_reload_actions = BIT(DEVLINK_RELOAD_ACTION_DRIVER_REINIT) |
-				    BIT(DEVLINK_RELOAD_ACTION_FW_ACTIVATE),
+				    BIT(DEVLINK_RELOAD_ACTION_FW_ACTIVATE) |
+				    BIT(DEVLINK_RELOAD_ACTION_FW_ACTIVATE_NO_RESET),
 	.reload_down = mlx5_devlink_reload_down,
 	.reload_up = mlx5_devlink_reload_up,
 };
-- 
2.17.1