static int create_direct_mr()

in mlx5/core/mr.c [52:87]

• 33 lines of code
• 3 McCabe index (conditional complexity)

static int create_direct_mr(struct mlx5_vdpa_dev *mvdev, struct mlx5_vdpa_direct_mr *mr)
{
	int inlen;
	void *mkc;
	void *in;
	int err;

	inlen = MLX5_ST_SZ_BYTES(create_mkey_in) + roundup(MLX5_ST_SZ_BYTES(mtt) * mr->nsg, 16);
	in = kvzalloc(inlen, GFP_KERNEL);
	if (!in)
		return -ENOMEM;

	MLX5_SET(create_mkey_in, in, uid, mvdev->res.uid);
	mkc = MLX5_ADDR_OF(create_mkey_in, in, memory_key_mkey_entry);
	MLX5_SET(mkc, mkc, lw, !!(mr->perm & VHOST_MAP_WO));
	MLX5_SET(mkc, mkc, lr, !!(mr->perm & VHOST_MAP_RO));
	mlx5_set_access_mode(mkc, MLX5_MKC_ACCESS_MODE_MTT);
	MLX5_SET(mkc, mkc, qpn, 0xffffff);
	MLX5_SET(mkc, mkc, pd, mvdev->res.pdn);
	MLX5_SET64(mkc, mkc, start_addr, mr->offset);
	MLX5_SET64(mkc, mkc, len, mr->end - mr->start);
	MLX5_SET(mkc, mkc, log_page_size, mr->log_size);
	MLX5_SET(mkc, mkc, translations_octword_size,
		 get_octo_len(mr->end - mr->start, mr->log_size));
	MLX5_SET(create_mkey_in, in, translations_octword_actual_size,
		 get_octo_len(mr->end - mr->start, mr->log_size));
	populate_mtts(mr, MLX5_ADDR_OF(create_mkey_in, in, klm_pas_mtt));
	err = mlx5_vdpa_create_mkey(mvdev, &mr->mr, in, inlen);
	kvfree(in);
	if (err) {
		mlx5_vdpa_warn(mvdev, "Failed to create direct MR\n");
		return err;
	}

	return 0;
}