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Date:   Tue, 19 Apr 2022 03:03:51 +0800
From:   kernel test robot <lkp@intel.com>
To:     Eli Cohen <elic@nvidia.com>, mst@redhat.com, jasowang@redhat.com
Cc:     kbuild-all@lists.01.org, virtualization@lists.linux-foundation.org,
        linux-kernel@vger.kernel.org, si-wei.liu@oracle.com,
        Eli Cohen <elic@nvidia.com>
Subject: Re: [PATCH v2 2/2] vdpa/mlx5: Add support for reading descriptor
 statistics
Message-ID: <202204190335.6x3ZxWPL-lkp@intel.com>
References: <20220412130402.46945-3-elic@nvidia.com>
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In-Reply-To: <20220412130402.46945-3-elic@nvidia.com>
User-Agent: Mutt/1.10.1 (2018-07-13)
Precedence: bulk

Hi Eli,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v5.18-rc3 next-20220414]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/intel-lab-lkp/linux/commits/Eli-Cohen/Show-statistics-for-a-vdpa-device/20220412-212129
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git ce522ba9ef7e2d9fb22a39eb3371c0c64e2a433e
config: i386-randconfig-s001-20220418 (https://download.01.org/0day-ci/archive/20220419/202204190335.6x3ZxWPL-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.2.0-19) 11.2.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-dirty
        # https://github.com/intel-lab-lkp/linux/commit/3d9eba4c8d59370c862469b93e157cd72a49d6ad
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Eli-Cohen/Show-statistics-for-a-vdpa-device/20220412-212129
        git checkout 3d9eba4c8d59370c862469b93e157cd72a49d6ad
        # save the config file to linux build tree
        mkdir build_dir
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=i386 SHELL=/bin/bash drivers/vdpa/mlx5/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>


sparse warnings: (new ones prefixed by >>)
>> drivers/vdpa/mlx5/net/mlx5_vnet.c:2583:19: sparse: sparse: cast to restricted __le16
>> drivers/vdpa/mlx5/net/mlx5_vnet.c:2583:19: sparse: sparse: cast from restricted __virtio16

vim +2583 drivers/vdpa/mlx5/net/mlx5_vnet.c

  2542	
  2543	static int mlx5_vdpa_get_vendor_vq_stats(struct vdpa_device *vdev, u16 idx,
  2544						 struct sk_buff *msg,
  2545						 struct netlink_ext_ack *extack)
  2546	{
  2547		struct mlx5_vdpa_dev *mvdev = to_mvdev(vdev);
  2548		struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev);
  2549		struct mlx5_vdpa_virtqueue *mvq;
  2550		struct mlx5_control_vq *cvq;
  2551		u64 received_desc;
  2552		u64 completed_desc;
  2553		int err = 0;
  2554		u16 max_vqp;
  2555	
  2556		mutex_lock(&ndev->numq_lock);
  2557		if (!is_index_valid(mvdev, idx)) {
  2558			NL_SET_ERR_MSG_MOD(extack, "virtqueue index is not valid");
  2559			err = -EINVAL;
  2560			goto out_err;
  2561		}
  2562	
  2563		if (idx == ctrl_vq_idx(mvdev)) {
  2564			cvq = &mvdev->cvq;
  2565			received_desc = cvq->received_desc;
  2566			completed_desc = cvq->completed_desc;
  2567			goto out;
  2568		}
  2569	
  2570		mvq = &ndev->vqs[idx];
  2571		err = counter_set_query(ndev, mvq, &received_desc, &completed_desc);
  2572		if (err) {
  2573			NL_SET_ERR_MSG_MOD(extack, "failed to query hardware");
  2574			goto out_err;
  2575		}
  2576	
  2577	out:
  2578		err = -EMSGSIZE;
  2579		if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_NEGOTIATED_FEATURES,
  2580				      mvdev->actual_features, VDPA_ATTR_PAD))
  2581			goto out_err;
  2582	
> 2583		max_vqp = le16_to_cpu(ndev->config.max_virtqueue_pairs);
  2584		if (nla_put_u16(msg, VDPA_ATTR_DEV_NET_CFG_MAX_VQP, max_vqp))
  2585			goto out_err;
  2586	
  2587		if (nla_put_string(msg, VDPA_ATTR_DEV_VENDOR_ATTR_NAME, "received_desc"))
  2588			goto out_err;
  2589	
  2590		if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_VENDOR_ATTR_VALUE, received_desc,
  2591				      VDPA_ATTR_PAD))
  2592			goto out_err;
  2593	
  2594		if (nla_put_string(msg, VDPA_ATTR_DEV_VENDOR_ATTR_NAME, "completed_desc"))
  2595			goto out_err;
  2596	
  2597		if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_VENDOR_ATTR_VALUE, completed_desc,
  2598				      VDPA_ATTR_PAD))
  2599			goto out_err;
  2600	
  2601		err = 0;
  2602	out_err:
  2603		mutex_unlock(&ndev->numq_lock);
  2604		return err;
  2605	}
  2606	

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