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Mon, 8 Jul 2024 05:02:16 -0700 From: Dragos Tatulea Date: Mon, 8 Jul 2024 15:00:44 +0300 Subject: [PATCH vhost v3 20/24] vdpa/mlx5: Use suspend/resume during VQP change Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-ID: <20240708-stage-vdpa-vq-precreate-v3-20-afe3c766e393@nvidia.com> References: <20240708-stage-vdpa-vq-precreate-v3-0-afe3c766e393@nvidia.com> In-Reply-To: <20240708-stage-vdpa-vq-precreate-v3-0-afe3c766e393@nvidia.com> To: "Michael S. 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This is done in preparation for VQ pre-creation which is coming in a later patch. It is necessary because calling setup_vq() on an already created VQ will return early and will not enable the queue. For symmetry, suspend a VQ instead of tearing it down when the number of VQ pairs decreases. But only if the resume operation is supported. Reviewed-by: Cosmin Ratiu Acked-by: Eugenio P=C3=A9rez Signed-off-by: Dragos Tatulea --- drivers/vdpa/mlx5/net/mlx5_vnet.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5= _vnet.c index ce1f6a1f36cd..324604b16b91 100644 --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c @@ -2130,14 +2130,22 @@ static int change_num_qps(struct mlx5_vdpa_dev *mvd= ev, int newqps) if (err) return err; =20 - for (i =3D ndev->cur_num_vqs - 1; i >=3D 2 * newqps; i--) - teardown_vq(ndev, &ndev->vqs[i]); + for (i =3D ndev->cur_num_vqs - 1; i >=3D 2 * newqps; i--) { + struct mlx5_vdpa_virtqueue *mvq =3D &ndev->vqs[i]; + + if (is_resumable(ndev)) + suspend_vq(ndev, mvq); + else + teardown_vq(ndev, mvq); + } =20 ndev->cur_num_vqs =3D 2 * newqps; } else { ndev->cur_num_vqs =3D 2 * newqps; for (i =3D cur_qps * 2; i < 2 * newqps; i++) { - err =3D setup_vq(ndev, &ndev->vqs[i], true); + struct mlx5_vdpa_virtqueue *mvq =3D &ndev->vqs[i]; + + err =3D mvq->initialized ? resume_vq(ndev, mvq) : setup_vq(ndev, mvq, t= rue); if (err) goto clean_added; } --=20 2.45.2