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Date: Wed, 30 Aug 2017 21:46:53 +0800
From: kbuild test robot <lkp@...el.com>
To: Tom Herbert <tom@...ntonium.net>
Cc: kbuild-all@...org, davem@...emloft.net, netdev@...r.kernel.org,
Tom Herbert <tom@...ntonium.net>
Subject: Re: [PATCH net-next 3/6] flow_dissector: Add protocol specific flow
dissection offload
Hi Tom,
[auto build test WARNING on net-next/master]
url: https://github.com/0day-ci/linux/commits/Tom-Herbert/flow_dissector-Protocol-specific-flow-dissector-offload/20170830-210709
config: x86_64-randconfig-x006-201735 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
# save the attached .config to linux build tree
make ARCH=x86_64
All warnings (new ones prefixed by >>):
net//ipv4/route.c: In function 'fib_multipath_hash':
>> net//ipv4/route.c:1817:4: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement]
struct flow_keys keys;
^~~~~~
vim +1817 net//ipv4/route.c
79a13159 Peter Nørlund 2015-09-30 1791
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1792 /* if skb is set it will be used and fl4 can be NULL */
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1793 int fib_multipath_hash(const struct fib_info *fi, const struct flowi4 *fl4,
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1794 const struct sk_buff *skb)
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1795 {
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1796 struct net *net = fi->fib_net;
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1797 struct flow_keys hash_keys;
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1798 u32 mhash;
79a13159 Peter Nørlund 2015-09-30 1799
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1800 switch (net->ipv4.sysctl_fib_multipath_hash_policy) {
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1801 case 0:
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1802 memset(&hash_keys, 0, sizeof(hash_keys));
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1803 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1804 if (skb) {
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1805 ip_multipath_l3_keys(skb, &hash_keys);
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1806 } else {
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1807 hash_keys.addrs.v4addrs.src = fl4->saddr;
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1808 hash_keys.addrs.v4addrs.dst = fl4->daddr;
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1809 }
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1810 break;
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1811 case 1:
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1812 /* skb is currently provided only when forwarding */
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1813 if (skb) {
19a7c5ba Tom Herbert 2017-08-29 1814 unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP |
19a7c5ba Tom Herbert 2017-08-29 1815 FLOW_DISSECTOR_F_STOP_AT_L4;
19a7c5ba Tom Herbert 2017-08-29 1816 ;
bf4e0a3d Nikolay Aleksandrov 2017-03-16 @1817 struct flow_keys keys;
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1818
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1819 /* short-circuit if we already have L4 hash present */
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1820 if (skb->l4_hash)
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1821 return skb_get_hash_raw(skb) >> 1;
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1822 memset(&hash_keys, 0, sizeof(hash_keys));
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1823 skb_flow_dissect_flow_keys(skb, &keys, flag);
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1824 hash_keys.addrs.v4addrs.src = keys.addrs.v4addrs.src;
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1825 hash_keys.addrs.v4addrs.dst = keys.addrs.v4addrs.dst;
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1826 hash_keys.ports.src = keys.ports.src;
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1827 hash_keys.ports.dst = keys.ports.dst;
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1828 hash_keys.basic.ip_proto = keys.basic.ip_proto;
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1829 } else {
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1830 memset(&hash_keys, 0, sizeof(hash_keys));
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1831 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1832 hash_keys.addrs.v4addrs.src = fl4->saddr;
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1833 hash_keys.addrs.v4addrs.dst = fl4->daddr;
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1834 hash_keys.ports.src = fl4->fl4_sport;
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1835 hash_keys.ports.dst = fl4->fl4_dport;
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1836 hash_keys.basic.ip_proto = fl4->flowi4_proto;
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1837 }
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1838 break;
79a13159 Peter Nørlund 2015-09-30 1839 }
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1840 mhash = flow_hash_from_keys(&hash_keys);
79a13159 Peter Nørlund 2015-09-30 1841
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1842 return mhash >> 1;
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1843 }
bf4e0a3d Nikolay Aleksandrov 2017-03-16 1844 EXPORT_SYMBOL_GPL(fib_multipath_hash);
79a13159 Peter Nørlund 2015-09-30 1845 #endif /* CONFIG_IP_ROUTE_MULTIPATH */
79a13159 Peter Nørlund 2015-09-30 1846
:::::: The code at line 1817 was first introduced by commit
:::::: bf4e0a3db97eb882368fd82980b3b1fa0b5b9778 net: ipv4: add support for ECMP hash policy choice
:::::: TO: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
:::::: CC: David S. Miller <davem@...emloft.net>
---
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