netdev - [PATCH rdma-next 09/10] RDMA/mlx5: Raise async event on device speed change

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Message-ID: <20251218-vf-bw-lag-mode-v1-9-7d8ed4368bea@nvidia.com>
Date: Thu, 18 Dec 2025 17:58:53 +0200
From: Edward Srouji <edwards@...dia.com>
To: <edwards@...dia.com>, Leon Romanovsky <leon@...nel.org>, Saeed Mahameed
	<saeedm@...dia.com>, Tariq Toukan <tariqt@...dia.com>, Mark Bloch
	<mbloch@...dia.com>, Andrew Lunn <andrew+netdev@...n.ch>, "David S. Miller"
	<davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
	<kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Jason Gunthorpe
	<jgg@...pe.ca>
CC: <netdev@...r.kernel.org>, <linux-rdma@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Or Har-Toov <ohartoov@...dia.com>
Subject: [PATCH rdma-next 09/10] RDMA/mlx5: Raise async event on device speed change

From: Or Har-Toov <ohartoov@...dia.com>

Raise IB_EVENT_DEVICE_SPEED_CHANGE whenever the speed of one of the
device's ports changes. Usually all ports of the device changes
together.

This ensures user applications and upper-layer software are immediately
notified when bandwidth changes, improving traffic management in dynamic
environments. This is especially useful for vports which are part of a
LAG configuration, to know if the effective speed of the LAG was
changed.

Signed-off-by: Or Har-Toov <ohartoov@...dia.com>
Reviewed-by: Mark Bloch <mbloch@...dia.com>
Signed-off-by: Edward Srouji <edwards@...dia.com>
---
 drivers/infiniband/hw/mlx5/main.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c
index 40284bbb45d6..bea42acbeaad 100644
--- a/drivers/infiniband/hw/mlx5/main.c
+++ b/drivers/infiniband/hw/mlx5/main.c
@@ -2838,6 +2838,14 @@ static int handle_port_change(struct mlx5_ib_dev *ibdev, struct mlx5_eqe *eqe,
 	case MLX5_PORT_CHANGE_SUBTYPE_ACTIVE:
 	case MLX5_PORT_CHANGE_SUBTYPE_DOWN:
 	case MLX5_PORT_CHANGE_SUBTYPE_INITIALIZED:
+		if (ibdev->ib_active) {
+			struct ib_event speed_event = {};
+
+			speed_event.device = &ibdev->ib_dev;
+			speed_event.event = IB_EVENT_DEVICE_SPEED_CHANGE;
+			ib_dispatch_event(&speed_event);
+		}
+
 		/* In RoCE, port up/down events are handled in
 		 * mlx5_netdev_event().
 		 */

-- 
2.47.1