netdev - [PATCH net-next 12/15] net/mlx5: Add sync reset drop mode support

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Message-ID: <20241013064540.170722-13-tariqt@nvidia.com>
Date: Sun, 13 Oct 2024 09:45:37 +0300
From: Tariq Toukan <tariqt@...dia.com>
To: "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>, Eric Dumazet <edumazet@...gle.com>
CC: <netdev@...r.kernel.org>, Saeed Mahameed <saeedm@...dia.com>, Gal Pressman
	<gal@...dia.com>, Leon Romanovsky <leonro@...dia.com>, <cjubran@...dia.com>,
	<cratiu@...dia.com>, Moshe Shemesh <moshe@...dia.com>, Aya Levin
	<ayal@...dia.com>, Tariq Toukan <tariqt@...dia.com>
Subject: [PATCH net-next 12/15] net/mlx5: Add sync reset drop mode support

From: Moshe Shemesh <moshe@...dia.com>

On sync reset flow, firmware may request a PF, which already
acknowledged the unload event, to move to drop mode. Drop mode means
that this PF will reduce polling frequency, as this PF is not going to
have another active part in the reset, but only reload back after the
reset.

Signed-off-by: Moshe Shemesh <moshe@...dia.com>
Reviewed-by: Aya Levin <ayal@...dia.com>
Signed-off-by: Tariq Toukan <tariqt@...dia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/fw_reset.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/fw_reset.c b/drivers/net/ethernet/mellanox/mlx5/core/fw_reset.c
index 4f55e55ecb55..566710d34a7b 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/fw_reset.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/fw_reset.c
@@ -35,6 +35,7 @@ struct mlx5_fw_reset {
 enum {
 	MLX5_FW_RST_STATE_IDLE = 0,
 	MLX5_FW_RST_STATE_TOGGLE_REQ = 4,
+	MLX5_FW_RST_STATE_DROP_MODE = 5,
 };
 
 enum {
@@ -616,6 +617,7 @@ static void mlx5_sync_reset_unload_event(struct work_struct *work)
 	struct mlx5_fw_reset *fw_reset;
 	struct mlx5_core_dev *dev;
 	unsigned long timeout;
+	int poll_freq = 20;
 	bool reset_action;
 	u8 rst_state;
 	int err;
@@ -651,7 +653,12 @@ static void mlx5_sync_reset_unload_event(struct work_struct *work)
 			reset_action = true;
 			break;
 		}
-		msleep(20);
+		if (rst_state == MLX5_FW_RST_STATE_DROP_MODE) {
+			mlx5_core_info(dev, "Sync Reset Drop mode ack\n");
+			mlx5_set_fw_rst_ack(dev);
+			poll_freq = 1000;
+		}
+		msleep(poll_freq);
 	} while (!time_after(jiffies, timeout));
 
 	if (!reset_action) {
-- 
2.44.0