netdev - Re: [PATCH net-next 2/3] net: qualcomm: rmnet: Add support for ethtool private stats

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Date:   Wed, 16 May 2018 07:16:42 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>
Cc:     kbuild-all@...org, davem@...emloft.net, netdev@...r.kernel.org,
        Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>
Subject: Re: [PATCH net-next 2/3] net: qualcomm: rmnet: Add support for
 ethtool private stats

Hi Subash,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on net-next/master]

url:    https://github.com/0day-ci/linux/commits/Subash-Abhinov-Kasiviswanathan/net-qualcomm-rmnet-Updates-2018-05-14/20180515-115355
config: x86_64-randconfig-s4-05160610 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All error/warnings (new ones prefixed by >>):

   In file included from include/linux/kernel.h:10:0,
                    from include/linux/list.h:9,
                    from include/linux/timer.h:5,
                    from include/linux/netdevice.h:28,
                    from drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c:16:
   drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c: In function 'rmnet_map_checksum_downlink_packet':
   include/linux/compiler.h:58:2: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
     if (__builtin_constant_p(!!(cond)) ? !!(cond) :   \
     ^
   include/linux/compiler.h:56:23: note: in expansion of macro '__trace_if'
    #define if(cond, ...) __trace_if( (cond , ## __VA_ARGS__) )
                          ^~~~~~~~~~
>> drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c:375:7: note: in expansion of macro 'if'
     else if (skb->protocol == htons(ETH_P_IPV6))
          ^~
   drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c:380:3: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
      return -EPROTONOSUPPORT;
      ^~~~~~
>> drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c:382:2: error: 'else' without a previous 'if'
     else
     ^~~~

vim +382 drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c

   349	
   350	/* Validates packet checksums. Function takes a pointer to
   351	 * the beginning of a buffer which contains the IP payload +
   352	 * padding + checksum trailer.
   353	 * Only IPv4 and IPv6 are supported along with TCP & UDP.
   354	 * Fragmented or tunneled packets are not supported.
   355	 */
   356	int rmnet_map_checksum_downlink_packet(struct sk_buff *skb, u16 len)
   357	{
   358		struct rmnet_priv *priv = netdev_priv(skb->dev);
   359		struct rmnet_map_dl_csum_trailer *csum_trailer;
   360	
   361		if (unlikely(!(skb->dev->features & NETIF_F_RXCSUM))) {
   362			priv->stats.csum_sw++;
   363			return -EOPNOTSUPP;
   364		}
   365	
   366		csum_trailer = (struct rmnet_map_dl_csum_trailer *)(skb->data + len);
   367	
   368		if (!csum_trailer->valid) {
   369			priv->stats.csum_valid_unset++;
   370			return -EINVAL;
   371		}
   372	
   373		if (skb->protocol == htons(ETH_P_IP))
   374			return rmnet_map_ipv4_dl_csum_trailer(skb, csum_trailer, priv);
 > 375		else if (skb->protocol == htons(ETH_P_IPV6))
   376	#if IS_ENABLED(CONFIG_IPV6)
   377			return rmnet_map_ipv6_dl_csum_trailer(skb, csum_trailer, priv);
   378	#else
   379			priv->stats.csum_err_invalid_ip_version++;
   380			return -EPROTONOSUPPORT;
   381	#endif
 > 382		else
   383			priv->stats.csum_err_invalid_ip_version++;
   384			return -EPROTONOSUPPORT;
   385	
   386		return 0;
   387	}
   388	

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