On Mon, Sep 12, 2022 at 8:50 PM Eli Cohen <elic@xxxxxxxxxx> wrote:
>
> RQT objects require that a power of two value be configured for both
> rqt_max_size and rqt_actual size.
>
> For create_rqt, make sure to round up to the power of two the value of
> given by the user who created the vdpa device and given by
> ndev->rqt_size. The actual size is also rounded up to the power of two
> using the current number of VQs given by ndev->cur_num_vqs.
>
> Same goes with modify_rqt where we need to make sure act size is power
> of two based on the new number of QPs.
>
> Without this patch, attempt to create a device with non power of two QPs
> would result in error from firmware.
>
> Fixes: 52893733f2c5 ("vdpa/mlx5: Add multiqueue support")
> Signed-off-by: Eli Cohen <elic@xxxxxxxxxx>
Acked-by: Jason Wang <jasowang@xxxxxxxxxx>
> ---
> drivers/vdpa/mlx5/net/mlx5_vnet.c | 17 ++++++++++-------
> 1 file changed, 10 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> index ed100a35e596..90913365def4 100644
> --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
> +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> @@ -1320,6 +1320,8 @@ static void teardown_vq(struct mlx5_vdpa_net *ndev, struct mlx5_vdpa_virtqueue *
>
> static int create_rqt(struct mlx5_vdpa_net *ndev)
> {
> + int rqt_table_size = roundup_pow_of_two(ndev->rqt_size);
> + int act_sz = roundup_pow_of_two(ndev->cur_num_vqs / 2);
> __be32 *list;
> void *rqtc;
> int inlen;
> @@ -1327,7 +1329,7 @@ static int create_rqt(struct mlx5_vdpa_net *ndev)
> int i, j;
> int err;
>
> - inlen = MLX5_ST_SZ_BYTES(create_rqt_in) + ndev->rqt_size * MLX5_ST_SZ_BYTES(rq_num);
> + inlen = MLX5_ST_SZ_BYTES(create_rqt_in) + rqt_table_size * MLX5_ST_SZ_BYTES(rq_num);
> in = kzalloc(inlen, GFP_KERNEL);
> if (!in)
> return -ENOMEM;
> @@ -1336,12 +1338,12 @@ static int create_rqt(struct mlx5_vdpa_net *ndev)
> rqtc = MLX5_ADDR_OF(create_rqt_in, in, rqt_context);
>
> MLX5_SET(rqtc, rqtc, list_q_type, MLX5_RQTC_LIST_Q_TYPE_VIRTIO_NET_Q);
> - MLX5_SET(rqtc, rqtc, rqt_max_size, ndev->rqt_size);
> + MLX5_SET(rqtc, rqtc, rqt_max_size, rqt_table_size);
> list = MLX5_ADDR_OF(rqtc, rqtc, rq_num[0]);
> - for (i = 0, j = 0; i < ndev->rqt_size; i++, j += 2)
> + for (i = 0, j = 0; i < act_sz; i++, j += 2)
> list[i] = cpu_to_be32(ndev->vqs[j % ndev->cur_num_vqs].virtq_id);
>
> - MLX5_SET(rqtc, rqtc, rqt_actual_size, ndev->rqt_size);
> + MLX5_SET(rqtc, rqtc, rqt_actual_size, act_sz);
> err = mlx5_vdpa_create_rqt(&ndev->mvdev, in, inlen, &ndev->res.rqtn);
> kfree(in);
> if (err)
> @@ -1354,6 +1356,7 @@ static int create_rqt(struct mlx5_vdpa_net *ndev)
>
> static int modify_rqt(struct mlx5_vdpa_net *ndev, int num)
> {
> + int act_sz = roundup_pow_of_two(num / 2);
> __be32 *list;
> void *rqtc;
> int inlen;
> @@ -1361,7 +1364,7 @@ static int modify_rqt(struct mlx5_vdpa_net *ndev, int num)
> int i, j;
> int err;
>
> - inlen = MLX5_ST_SZ_BYTES(modify_rqt_in) + ndev->rqt_size * MLX5_ST_SZ_BYTES(rq_num);
> + inlen = MLX5_ST_SZ_BYTES(modify_rqt_in) + act_sz * MLX5_ST_SZ_BYTES(rq_num);
> in = kzalloc(inlen, GFP_KERNEL);
> if (!in)
> return -ENOMEM;
> @@ -1372,10 +1375,10 @@ static int modify_rqt(struct mlx5_vdpa_net *ndev, int num)
> MLX5_SET(rqtc, rqtc, list_q_type, MLX5_RQTC_LIST_Q_TYPE_VIRTIO_NET_Q);
>
> list = MLX5_ADDR_OF(rqtc, rqtc, rq_num[0]);
> - for (i = 0, j = 0; i < ndev->rqt_size; i++, j += 2)
> + for (i = 0, j = 0; i < act_sz; i++, j = j + 2)
> list[i] = cpu_to_be32(ndev->vqs[j % num].virtq_id);
>
> - MLX5_SET(rqtc, rqtc, rqt_actual_size, ndev->rqt_size);
> + MLX5_SET(rqtc, rqtc, rqt_actual_size, act_sz);
> err = mlx5_vdpa_modify_rqt(&ndev->mvdev, in, inlen, ndev->res.rqtn);
> kfree(in);
> if (err)
> --
> 2.35.1
>
_______________________________________________
Virtualization mailing list
Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx
https://lists.linuxfoundation.org/mailman/listinfo/virtualization
