netdev - Re: [PATCH net-next 4/5] tun: Add support for SCTP checksum offload

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Date:   Tue, 3 Apr 2018 08:49:23 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Vladislav Yasevich <vyasevich@...il.com>
Cc:     kbuild-all@...org, netdev@...r.kernel.org,
        linux-sctp@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, mst@...hat.com,
        jasowang@...hat.com, nhorman@...driver.com,
        Vladislav Yasevich <vyasevic@...hat.com>
Subject: Re: [PATCH net-next 4/5] tun: Add support for SCTP checksum offload

Hi Vladislav,

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/Vladislav-Yasevich/virtio-net-Add-SCTP-checksum-offload-support/20180402-221407
config: m68k-hp300_defconfig (attached as .config)
compiler: m68k-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=m68k 

Note: the linux-review/Vladislav-Yasevich/virtio-net-Add-SCTP-checksum-offload-support/20180402-221407 HEAD 5e0497a085e70055a1981959802173f4ff05c86b builds fine.
      It only hurts bisectibility.

All errors (new ones prefixed by >>):

   drivers/net/tun.c: In function 'set_offload':
>> drivers/net/tun.c:2722:12: error: 'TUN_F_SCTP_CSUM' undeclared (first use in this function); did you mean 'TUN_F_CSUM'?
     if (arg & TUN_F_SCTP_CSUM) {
               ^~~~~~~~~~~~~~~
               TUN_F_CSUM
   drivers/net/tun.c:2722:12: note: each undeclared identifier is reported only once for each function it appears in

vim +2722 drivers/net/tun.c

  2696	
  2697	/* This is like a cut-down ethtool ops, except done via tun fd so no
  2698	 * privs required. */
  2699	static int set_offload(struct tun_struct *tun, unsigned long arg)
  2700	{
  2701		netdev_features_t features = 0;
  2702	
  2703		if (arg & TUN_F_CSUM) {
  2704			features |= NETIF_F_HW_CSUM;
  2705			arg &= ~TUN_F_CSUM;
  2706	
  2707			if (arg & (TUN_F_TSO4|TUN_F_TSO6)) {
  2708				if (arg & TUN_F_TSO_ECN) {
  2709					features |= NETIF_F_TSO_ECN;
  2710					arg &= ~TUN_F_TSO_ECN;
  2711				}
  2712				if (arg & TUN_F_TSO4)
  2713					features |= NETIF_F_TSO;
  2714				if (arg & TUN_F_TSO6)
  2715					features |= NETIF_F_TSO6;
  2716				arg &= ~(TUN_F_TSO4|TUN_F_TSO6);
  2717			}
  2718	
  2719			arg &= ~TUN_F_UFO;
  2720		}
  2721	
> 2722		if (arg & TUN_F_SCTP_CSUM) {
  2723			features |= NETIF_F_SCTP_CRC;
  2724			arg &= ~TUN_F_SCTP_CSUM;
  2725		}
  2726	
  2727		/* This gives the user a way to test for new features in future by
  2728		 * trying to set them. */
  2729		if (arg)
  2730			return -EINVAL;
  2731	
  2732		tun->set_features = features;
  2733		tun->dev->wanted_features &= ~TUN_USER_FEATURES;
  2734		tun->dev->wanted_features |= features;
  2735		netdev_update_features(tun->dev);
  2736	
  2737		return 0;
  2738	}
  2739	

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