linux-kernel - [PATCH vhost v2 08/24] vdpa/mlx5: Clear and reinitialize software VQ data on reset

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Date: Wed, 26 Jun 2024 13:26:44 +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 v2 08/24] vdpa/mlx5: Clear and reinitialize software
 VQ data on reset

The hardware VQ configuration is mirrored by data in struct
mlx5_vdpa_virtqueue . Instead of clearing just a few fields at reset,
fully clear the struct and initialize with the appropriate default
values.

As clear_vqs_ready() is used only during reset, get rid of it.

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 | 16 +++-------------
 1 file changed, 3 insertions(+), 13 deletions(-)

diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
index c8b5c87f001d..de013b5a2815 100644
--- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
+++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
@@ -2941,18 +2941,6 @@ static void teardown_vq_resources(struct mlx5_vdpa_net *ndev)
 	ndev->setup = false;
 }
 
-static void clear_vqs_ready(struct mlx5_vdpa_net *ndev)
-{
-	int i;
-
-	for (i = 0; i < ndev->mvdev.max_vqs; i++) {
-		ndev->vqs[i].ready = false;
-		ndev->vqs[i].modified_fields = 0;
-	}
-
-	ndev->mvdev.cvq.ready = false;
-}
-
 static int setup_cvq_vring(struct mlx5_vdpa_dev *mvdev)
 {
 	struct mlx5_control_vq *cvq = &mvdev->cvq;
@@ -3035,12 +3023,14 @@ static int mlx5_vdpa_compat_reset(struct vdpa_device *vdev, u32 flags)
 	down_write(&ndev->reslock);
 	unregister_link_notifier(ndev);
 	teardown_vq_resources(ndev);
-	clear_vqs_ready(ndev);
+	init_mvqs(ndev);
+
 	if (flags & VDPA_RESET_F_CLEAN_MAP)
 		mlx5_vdpa_destroy_mr_resources(&ndev->mvdev);
 	ndev->mvdev.status = 0;
 	ndev->mvdev.suspended = false;
 	ndev->cur_num_vqs = MLX5V_DEFAULT_VQ_COUNT;
+	ndev->mvdev.cvq.ready = false;
 	ndev->mvdev.cvq.received_desc = 0;
 	ndev->mvdev.cvq.completed_desc = 0;
 	memset(ndev->event_cbs, 0, sizeof(*ndev->event_cbs) * (mvdev->max_vqs + 1));

-- 
2.45.1