mlx5_sd_ch_ix_get_dev_ix
sd_ix = mlx5_sd_ch_ix_get_dev_ix(c->mdev, MLX5E_PTP_CHANNEL_IX);
c->sd_ix = mlx5_sd_ch_ix_get_dev_ix(mdev, ix);
int mdev_idx = mlx5_sd_ch_ix_get_dev_ix(primary, ch_ix);
int mlx5_sd_ch_ix_get_dev_ix(struct mlx5_core_dev *dev, int ch_ix);