Re: [PATCH RFC net-next] net: hns3: add VF representor for tc flower queue selection

[kernel test robot <lkp@intel.com>]

Hi Jijie,

[This is a private test report for your RFC patch.]
kernel test robot noticed the following build warnings:

[auto build test WARNING on 1c664ec4b9ea827b609d296921ed5bad8a40a158]

url:    https://github.com/intel-lab-lkp/linux/commits/Jijie-Shao/net-hns3-add-VF-representor-for-tc-flower-queue-selection/20260701-213500
base:   1c664ec4b9ea827b609d296921ed5bad8a40a158
patch link:    https://lore.kernel.org/r/20260701130806.695180-1-shaojijie%40huawei.com
patch subject: [PATCH RFC net-next] net: hns3: add VF representor for tc flower queue selection
config: alpha-allyesconfig (https://download.01.org/0day-ci/archive/20260702/202607020021.909sTNav-lkp@intel.com/config)
compiler: alpha-linux-gcc (GCC) 16.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260702/202607020021.909sTNav-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202607020021.909sTNav-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_vf_rep.c: In function 'hclge_create_vf_reps':
>> drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_vf_rep.c:107:45: warning: '_rep' directive output may be truncated writing 4 bytes into a region of size between 1 and 16 [-Wformat-truncation=]
     107 |                 snprintf(name, IFNAMSIZ, "%s_rep%d",
         |                                             ^~~~
   drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_vf_rep.c:107:42: note: directive argument in the range [0, 2147483646]
     107 |                 snprintf(name, IFNAMSIZ, "%s_rep%d",
         |                                          ^~~~~~~~~~
   drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_vf_rep.c:107:17: note: 'snprintf' output between 6 and 30 bytes into a destination of size 16
     107 |                 snprintf(name, IFNAMSIZ, "%s_rep%d",
         |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     108 |                          hdev->vport[0].nic.netdev->name, i);
         |                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/_rep +107 drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_vf_rep.c

    89	
    90	int hclge_create_vf_reps(struct hnae3_ae_dev *ae_dev, int num_vfs)
    91	{
    92		struct hclge_dev *hdev = ae_dev->priv;
    93		struct hclge_vf_rep *vf_rep;
    94		struct net_device *ndev;
    95		char name[IFNAMSIZ];
    96		int ret, i;
    97	
    98		if (!num_vfs)
    99			return 0;
   100	
   101		hdev->vf_reps = kcalloc(num_vfs, sizeof(struct hclge_vf_rep *),
   102					GFP_KERNEL);
   103		if (!hdev->vf_reps)
   104			return -ENOMEM;
   105	
   106		for (i = 0; i < num_vfs; i++) {
 > 107			snprintf(name, IFNAMSIZ, "%s_rep%d",
   108				 hdev->vport[0].nic.netdev->name, i);
   109			ndev = alloc_netdev(sizeof(struct hclge_vf_rep), name,
   110					    NET_NAME_UNKNOWN, ether_setup);
   111			if (!ndev) {
   112				ret = -ENOMEM;
   113				goto err;
   114			}
   115	
   116			hclge_vf_rep_net_setup(ndev);
   117	
   118			vf_rep = netdev_priv(ndev);
   119			vf_rep->hdev = hdev;
   120			vf_rep->vport = &hdev->vport[i + HCLGE_VF_VPORT_START_NUM];
   121			vf_rep->netdev = ndev;
   122	
   123			ret = register_netdev(ndev);
   124			if (ret) {
   125				free_netdev(ndev);
   126				goto err;
   127			}
   128	
   129			hdev->vf_reps[i] = vf_rep;
   130		}
   131	
   132		hdev->num_vf_reps = num_vfs;
   133		return 0;
   134	
   135	err:
   136		while (i--)
   137			unregister_netdev(hdev->vf_reps[i]->netdev);
   138		kfree(hdev->vf_reps);
   139		hdev->vf_reps = NULL;
   140		return ret;
   141	}
   142	

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https://github.com/intel/lkp-tests/wiki