Re: [PATCH net-next v11 2/4] ethtool: provide customized dim profile management

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

Hi Heng,

kernel test robot noticed the following build warnings:

[auto build test WARNING on net-next/main]

url:    https://github.com/intel-lab-lkp/linux/commits/Heng-Qi/linux-dim-move-useful-macros-to-h-file/20240501-013413
base:   net-next/main
patch link:    https://lore.kernel.org/r/20240430173136.15807-3-hengqi%40linux.alibaba.com
patch subject: [PATCH net-next v11 2/4] ethtool: provide customized dim profile management
config: openrisc-defconfig (https://download.01.org/0day-ci/archive/20240501/202405011004.Rkw6IrSl-lkp@intel.com/config)
compiler: or1k-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240501/202405011004.Rkw6IrSl-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/202405011004.Rkw6IrSl-lkp@intel.com/

All warnings (new ones prefixed by >>):

   net/ethtool/coalesce.c: In function 'ethnl_update_profile':
   net/ethtool/coalesce.c:453:46: error: 'struct net_device' has no member named 'irq_moder'
     453 |         struct dim_irq_moder *irq_moder = dev->irq_moder;
         |                                              ^~
   net/ethtool/coalesce.c: At top level:
>> net/ethtool/coalesce.c:446:12: warning: 'ethnl_update_profile' defined but not used [-Wunused-function]
     446 | static int ethnl_update_profile(struct net_device *dev,
         |            ^~~~~~~~~~~~~~~~~~~~
>> net/ethtool/coalesce.c:151:12: warning: 'coalesce_put_profile' defined but not used [-Wunused-function]
     151 | static int coalesce_put_profile(struct sk_buff *skb, u16 attr_type,
         |            ^~~~~~~~~~~~~~~~~~~~


vim +/ethnl_update_profile +446 net/ethtool/coalesce.c

   424	
   425	/**
   426	 * ethnl_update_profile - get a profile nest with child nests from userspace.
   427	 * @dev: netdevice to update the profile
   428	 * @dst: profile get from the driver and modified by ethnl_update_profile.
   429	 * @nests: nest attr ETHTOOL_A_COALESCE_*X_PROFILE to set profile.
   430	 * @extack: Netlink extended ack
   431	 *
   432	 * Layout of nests:
   433	 *   Nested ETHTOOL_A_COALESCE_*X_PROFILE attr
   434	 *     Nested ETHTOOL_A_PROFILE_IRQ_MODERATION attr
   435	 *       ETHTOOL_A_IRQ_MODERATION_USEC attr
   436	 *       ETHTOOL_A_IRQ_MODERATION_PKTS attr
   437	 *       ETHTOOL_A_IRQ_MODERATION_COMPS attr
   438	 *     ...
   439	 *     Nested ETHTOOL_A_PROFILE_IRQ_MODERATION attr
   440	 *       ETHTOOL_A_IRQ_MODERATION_USEC attr
   441	 *       ETHTOOL_A_IRQ_MODERATION_PKTS attr
   442	 *       ETHTOOL_A_IRQ_MODERATION_COMPS attr
   443	 *
   444	 * Return: 0 on success or a negative error code.
   445	 */
 > 446	static int ethnl_update_profile(struct net_device *dev,
   447					struct dim_cq_moder __rcu **dst,
   448					const struct nlattr *nests,
   449					struct netlink_ext_ack *extack)
   450	{
   451		int len_irq_moder = ARRAY_SIZE(coalesce_irq_moderation_policy);
   452		struct nlattr *tb[ARRAY_SIZE(coalesce_irq_moderation_policy)];
 > 453		struct dim_irq_moder *irq_moder = dev->irq_moder;
   454		struct dim_cq_moder *new_profile, *old_profile;
   455		int ret, rem, i = 0, len;
   456		struct nlattr *nest;
   457	
   458		if (!nests)
   459			return 0;
   460	
   461		if (!*dst)
   462			return -EOPNOTSUPP;
   463	
   464		old_profile = rtnl_dereference(*dst);
   465		len = NET_DIM_PARAMS_NUM_PROFILES * sizeof(*old_profile);
   466		new_profile = kmemdup(old_profile, len, GFP_KERNEL);
   467		if (!new_profile)
   468			return -ENOMEM;
   469	
   470		nla_for_each_nested_type(nest, ETHTOOL_A_PROFILE_IRQ_MODERATION,
   471					 nests, rem) {
   472			ret = nla_parse_nested(tb, len_irq_moder - 1, nest,
   473					       coalesce_irq_moderation_policy,
   474					       extack);
   475			if (ret)
   476				goto err_out;
   477	
   478			ret = ethnl_update_irq_moder(irq_moder, &new_profile[i].usec,
   479						     ETHTOOL_A_IRQ_MODERATION_USEC,
   480						     tb, DIM_COALESCE_USEC,
   481						     extack);
   482			if (ret)
   483				goto err_out;
   484	
   485			ret = ethnl_update_irq_moder(irq_moder, &new_profile[i].pkts,
   486						     ETHTOOL_A_IRQ_MODERATION_PKTS,
   487						     tb, DIM_COALESCE_PKTS,
   488						     extack);
   489			if (ret)
   490				goto err_out;
   491	
   492			ret = ethnl_update_irq_moder(irq_moder, &new_profile[i].comps,
   493						     ETHTOOL_A_IRQ_MODERATION_COMPS,
   494						     tb, DIM_COALESCE_COMPS,
   495						     extack);
   496			if (ret)
   497				goto err_out;
   498	
   499			i++;
   500		}
   501	
   502		rcu_assign_pointer(*dst, new_profile);
   503		kfree_rcu(old_profile, rcu);
   504	
   505		return 0;
   506	
   507	err_out:
   508		kfree(new_profile);
   509		return ret;
   510	}
   511	

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