netdev - Re: [PATCH v2 net-next 4/6] net: dsa: tag_rtl8_4: add realtek 8 byte protocol 4 tag

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Date:   Thu, 14 Oct 2021 08:38:37 +0800
From:   kernel test robot <lkp@...el.com>
To:     Alvin Šipraga <alvin@...s.dk>,
        Linus Walleij <linus.walleij@...aro.org>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Heiner Kallweit <hkallweit1@...il.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH v2 net-next 4/6] net: dsa: tag_rtl8_4: add realtek 8 byte
 protocol 4 tag

Hi "Alvin,

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/Alvin-ipraga/net-dsa-add-support-for-RTL8365MB-VC/20211013-225955
base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git d1f24712a86abd04d82cf4b00fb4ab8ff2d23c8a
config: x86_64-randconfig-r034-20211013 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project b6a8c695542b2987eb9a203d5663a0740cb4725f)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/e17d422e49ba2acbf43ae144fcce940cc06152a0
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Alvin-ipraga/net-dsa-add-support-for-RTL8365MB-VC/20211013-225955
        git checkout e17d422e49ba2acbf43ae144fcce940cc06152a0
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=x86_64 

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

All errors (new ones prefixed by >>):

>> net/dsa/tag_rtl8_4.c:108:17: error: implicit declaration of function 'FIELD_PREP' [-Werror,-Wimplicit-function-declaration]
           tag[1] = htons(FIELD_PREP(RTL8_4_PROTOCOL, RTL8_4_PROTOCOL_RTL8365MB));
                          ^
>> net/dsa/tag_rtl8_4.c:142:10: error: implicit declaration of function 'FIELD_GET' [-Werror,-Wimplicit-function-declaration]
           proto = FIELD_GET(RTL8_4_PROTOCOL, ntohs(tag[1]));
                   ^
   2 errors generated.


vim +/FIELD_PREP +108 net/dsa/tag_rtl8_4.c

    85	
    86	static struct sk_buff *rtl8_4_tag_xmit(struct sk_buff *skb,
    87					       struct net_device *dev)
    88	{
    89		struct dsa_port *dp = dsa_slave_to_port(dev);
    90		__be16 *tag;
    91	
    92		/* Pad out so the (stripped) packet is at least 64 bytes long
    93		 * (including FCS), otherwise the switch will drop the packet.
    94		 * Then we need an additional 8 bytes for the Realtek tag.
    95		 */
    96		if (unlikely(__skb_put_padto(skb, ETH_ZLEN + RTL8_4_TAG_LEN, false)))
    97			return NULL;
    98	
    99		skb_push(skb, RTL8_4_TAG_LEN);
   100	
   101		dsa_alloc_etype_header(skb, RTL8_4_TAG_LEN);
   102		tag = dsa_etype_header_pos_tx(skb);
   103	
   104		/* Set Realtek EtherType */
   105		tag[0] = htons(ETH_P_REALTEK);
   106	
   107		/* Set Protocol; zero REASON */
 > 108		tag[1] = htons(FIELD_PREP(RTL8_4_PROTOCOL, RTL8_4_PROTOCOL_RTL8365MB));
   109	
   110		/* Zero FID_EN, FID, PRI_EN, PRI, KEEP; set LEARN_DIS */
   111		tag[2] = htons(FIELD_PREP(RTL8_4_LEARN_DIS, 1));
   112	
   113		/* Zero ALLOW; set RX (CPU->switch) forwarding port mask */
   114		tag[3] = htons(FIELD_PREP(RTL8_4_RX, BIT(dp->index)));
   115	
   116		return skb;
   117	}
   118	
   119	static struct sk_buff *rtl8_4_tag_rcv(struct sk_buff *skb,
   120					      struct net_device *dev)
   121	{
   122		__be16 *tag;
   123		u16 etype;
   124		u8 reason;
   125		u8 proto;
   126		u8 port;
   127	
   128		if (unlikely(!pskb_may_pull(skb, RTL8_4_TAG_LEN)))
   129			return NULL;
   130	
   131		tag = dsa_etype_header_pos_rx(skb);
   132	
   133		/* Parse Realtek EtherType */
   134		etype = ntohs(tag[0]);
   135		if (unlikely(etype != ETH_P_REALTEK)) {
   136			dev_warn_ratelimited(&dev->dev,
   137					     "non-realtek ethertype 0x%04x\n", etype);
   138			return NULL;
   139		}
   140	
   141		/* Parse Protocol */
 > 142		proto = FIELD_GET(RTL8_4_PROTOCOL, ntohs(tag[1]));
   143		if (unlikely(proto != RTL8_4_PROTOCOL_RTL8365MB)) {
   144			dev_warn_ratelimited(&dev->dev,
   145					     "unknown realtek protocol 0x%02x\n",
   146					     proto);
   147			return NULL;
   148		}
   149	
   150		/* Parse REASON */
   151		reason = FIELD_GET(RTL8_4_REASON, ntohs(tag[1]));
   152	
   153		/* Parse TX (switch->CPU) */
   154		port = FIELD_GET(RTL8_4_TX, ntohs(tag[3]));
   155		skb->dev = dsa_master_find_slave(dev, 0, port);
   156		if (!skb->dev) {
   157			dev_warn_ratelimited(&dev->dev,
   158					     "could not find slave for port %d\n",
   159					     port);
   160			return NULL;
   161		}
   162	
   163		/* Remove tag and recalculate checksum */
   164		skb_pull_rcsum(skb, RTL8_4_TAG_LEN);
   165	
   166		dsa_strip_etype_header(skb, RTL8_4_TAG_LEN);
   167	
   168		if (reason != RTL8_4_REASON_TRAP)
   169			dsa_default_offload_fwd_mark(skb);
   170	
   171		return skb;
   172	}
   173	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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