linux-kernel - [PATCH vhost v3 16/24] vdpa/mlx5: Accept Init -> Ready VQ transition in resume

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Message-ID: <20240708-stage-vdpa-vq-precreate-v3-16-afe3c766e393@nvidia.com>
Date: Mon, 8 Jul 2024 15:00:40 +0300
From: Dragos Tatulea <dtatulea@...dia.com>
To: "Michael S. Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, Eugenio Pérez
	<eperezma@...hat.com>, Saeed Mahameed <saeedm@...dia.com>, Leon Romanovsky
	<leon@...nel.org>, Tariq Toukan <tariqt@...dia.com>, Si-Wei Liu
	<si-wei.liu@...cle.com>
CC: <virtualization@...ts.linux.dev>, <linux-kernel@...r.kernel.org>,
	<linux-rdma@...r.kernel.org>, <netdev@...r.kernel.org>, Cosmin Ratiu
	<cratiu@...dia.com>, Dragos Tatulea <dtatulea@...dia.com>
Subject: [PATCH vhost v3 16/24] vdpa/mlx5: Accept Init -> Ready VQ
 transition in resume_vq()

Until now resume_vq() was used only for the suspend/resume scenario.
This change also allows calling resume_vq() to bring it from Init to
Ready state (VQ initialization).

Reviewed-by: Cosmin Ratiu <cratiu@...dia.com>
Acked-by: Eugenio Pérez <eperezma@...hat.com>
Signed-off-by: Dragos Tatulea <dtatulea@...dia.com>
---
 drivers/vdpa/mlx5/net/mlx5_vnet.c | 24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
index 0a62ce0b4af8..adcc4d63cf83 100644
--- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
+++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
@@ -1557,11 +1557,31 @@ static void suspend_vqs(struct mlx5_vdpa_net *ndev)
 
 static void resume_vq(struct mlx5_vdpa_net *ndev, struct mlx5_vdpa_virtqueue *mvq)
 {
-	if (!mvq->initialized || !is_resumable(ndev))
+	if (!mvq->initialized)
 		return;
 
-	if (mvq->fw_state != MLX5_VIRTIO_NET_Q_OBJECT_STATE_SUSPEND)
+	switch (mvq->fw_state) {
+	case MLX5_VIRTIO_NET_Q_OBJECT_STATE_INIT:
+		/* Due to a FW quirk we need to modify the VQ fields first then change state.
+		 * This should be fixed soon. After that, a single command can be used.
+		 */
+		if (modify_virtqueue(ndev, mvq, 0))
+			mlx5_vdpa_warn(&ndev->mvdev,
+				"modify vq properties failed for vq %u\n", mvq->index);
+		break;
+	case MLX5_VIRTIO_NET_Q_OBJECT_STATE_SUSPEND:
+		if (!is_resumable(ndev)) {
+			mlx5_vdpa_warn(&ndev->mvdev, "vq %d is not resumable\n", mvq->index);
+			return;
+		}
+		break;
+	case MLX5_VIRTIO_NET_Q_OBJECT_STATE_RDY:
 		return;
+	default:
+		mlx5_vdpa_warn(&ndev->mvdev, "resume vq %u called from bad state %d\n",
+			       mvq->index, mvq->fw_state);
+		return;
+	}
 
 	if (modify_virtqueue_state(ndev, mvq, MLX5_VIRTIO_NET_Q_OBJECT_STATE_RDY))
 		mlx5_vdpa_warn(&ndev->mvdev, "modify to resume failed for vq %u\n", mvq->index);

-- 
2.45.2