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vdpa/mlx5: Small improvement for change_num_qps()

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change_num_qps() has a lot of multiplications by 2 to convert
the number of VQ pairs to number of VQs. This patch simplifies
the code by doing the VQP -> VQ count conversion at the beginning
in a variable.

Signed-off-by: Dragos Tatulea <dtatulea@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Message-Id: <20240816090159.1967650-10-dtatulea@nvidia.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Eugenio Pérez <eperezma@redhat.com>
Tested-by: Lei Yang <leiyang@redhat.com>
This commit is contained in:
Dragos Tatulea 2024-08-16 12:01:58 +03:00 committed by Michael S. Tsirkin
parent 55a7cb05b0
commit 74c89072f2
1 changed files with 11 additions and 10 deletions
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21
drivers/vdpa/mlx5/net/mlx5_vnet.c
View File

@ -2219,16 +2219,17 @@ static virtio_net_ctrl_ack handle_ctrl_mac(struct mlx5_vdpa_dev *mvdev, u8 cmd)
static int change_num_qps(struct mlx5_vdpa_dev *mvdev, int newqps)
{
struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev);
int cur_qps = ndev->cur_num_vqs / 2;
int cur_vqs = ndev->cur_num_vqs;
int new_vqs = newqps * 2;
int err;
int i;
if (cur_qps > newqps) {
err = modify_rqt(ndev, 2 * newqps);
if (cur_vqs > new_vqs) {
err = modify_rqt(ndev, new_vqs);
if (err)
return err;
for (i = ndev->cur_num_vqs - 1; i >= 2 * newqps; i--) {
for (i = cur_vqs - 1; i >= new_vqs; i--) {
struct mlx5_vdpa_virtqueue *mvq = &ndev->vqs[i];
if (is_resumable(ndev))
@ -2237,27 +2238,27 @@ static int change_num_qps(struct mlx5_vdpa_dev *mvdev, int newqps)
teardown_vq(ndev, mvq);
}
ndev->cur_num_vqs = 2 * newqps;
ndev->cur_num_vqs = new_vqs;
} else {
ndev->cur_num_vqs = 2 * newqps;
for (i = cur_qps * 2; i < 2 * newqps; i++) {
ndev->cur_num_vqs = new_vqs;
for (i = cur_vqs; i < new_vqs; i++) {
struct mlx5_vdpa_virtqueue *mvq = &ndev->vqs[i];
err = mvq->initialized ? resume_vq(ndev, mvq) : setup_vq(ndev, mvq, true);
if (err)
goto clean_added;
}
err = modify_rqt(ndev, 2 * newqps);
err = modify_rqt(ndev, new_vqs);
if (err)
goto clean_added;
}
return 0;
clean_added:
for (--i; i >= 2 * cur_qps; --i)
for (--i; i >= cur_vqs; --i)
teardown_vq(ndev, &ndev->vqs[i]);
ndev->cur_num_vqs = 2 * cur_qps;
ndev->cur_num_vqs = cur_vqs;
return err;
}