linux-kernel - drivers/net/ethernet/sfc/falcon/selftest.c:45:16: warning: field ip within 'struct ef4_loopback_payload::(anonymous at drivers/net/ethernet/sfc/falcon/selftest.c:43:2)' is less aligned than 'struct iphdr' and is usually due to 'struct ef4_loopback

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Message-ID: <202308152020.SxCOJiOI-lkp@intel.com>
Date:   Tue, 15 Aug 2023 20:30:23 +0800
From:   kernel test robot <lkp@...el.com>
To:     Edward Cree <ecree.xilinx@...il.com>
Cc:     llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
        linux-kernel@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>,
        Andy Moreton <andy.moreton@....com>,
        Simon Horman <simon.horman@...igine.com>
Subject: drivers/net/ethernet/sfc/falcon/selftest.c:45:16: warning: field ip
 within 'struct ef4_loopback_payload::(anonymous at
 drivers/net/ethernet/sfc/falcon/selftest.c:43:2)' is less aligned than
 'struct iphdr' and is usually due to 'struct ef4_loopback_payload...

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   91aa6c412d7f85e48aead7b00a7d9e91f5cf5863
commit: 55c1528f9b97ff3b7efad73e8f79627fc2efb298 sfc: fix field-spanning memcpy in selftest
date:   2 weeks ago
config: arm-randconfig-r011-20230815 (https://download.01.org/0day-ci/archive/20230815/202308152020.SxCOJiOI-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
reproduce: (https://download.01.org/0day-ci/archive/20230815/202308152020.SxCOJiOI-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202308152020.SxCOJiOI-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/net/ethernet/sfc/falcon/selftest.c:45:16: warning: field ip within 'struct ef4_loopback_payload::(anonymous at drivers/net/ethernet/sfc/falcon/selftest.c:43:2)' is less aligned than 'struct iphdr' and is usually due to 'struct ef4_loopback_payload::(anonymous at drivers/net/ethernet/sfc/falcon/selftest.c:43:2)' being packed, which can lead to unaligned accesses [-Wunaligned-access]
      45 |                 struct iphdr ip;
         |                              ^
>> drivers/net/ethernet/sfc/falcon/selftest.c:45:16: warning: field ip within 'struct ef4_loopback_payload::(unnamed at drivers/net/ethernet/sfc/falcon/selftest.c:43:2)' is less aligned than 'struct iphdr' and is usually due to 'struct ef4_loopback_payload::(unnamed at drivers/net/ethernet/sfc/falcon/selftest.c:43:2)' being packed, which can lead to unaligned accesses [-Wunaligned-access]
   2 warnings generated.


vim +45 drivers/net/ethernet/sfc/falcon/selftest.c

5a6681e22c1409 Edward Cree 2016-11-28  34  
5a6681e22c1409 Edward Cree 2016-11-28  35  /*
5a6681e22c1409 Edward Cree 2016-11-28  36   * Loopback test packet structure
5a6681e22c1409 Edward Cree 2016-11-28  37   *
5a6681e22c1409 Edward Cree 2016-11-28  38   * The self-test should stress every RSS vector, and unfortunately
5a6681e22c1409 Edward Cree 2016-11-28  39   * Falcon only performs RSS on TCP/UDP packets.
5a6681e22c1409 Edward Cree 2016-11-28  40   */
5a6681e22c1409 Edward Cree 2016-11-28  41  struct ef4_loopback_payload {
1186c6b31ee14f Edward Cree 2023-06-23  42  	char pad[2]; /* Ensures ip is 4-byte aligned */
55c1528f9b97ff Edward Cree 2023-07-28  43  	struct_group_attr(packet, __packed,
5a6681e22c1409 Edward Cree 2016-11-28  44  		struct ethhdr header;
5a6681e22c1409 Edward Cree 2016-11-28 @45  		struct iphdr ip;
5a6681e22c1409 Edward Cree 2016-11-28  46  		struct udphdr udp;
5a6681e22c1409 Edward Cree 2016-11-28  47  		__be16 iteration;
5a6681e22c1409 Edward Cree 2016-11-28  48  		char msg[64];
55c1528f9b97ff Edward Cree 2023-07-28  49  	);
1186c6b31ee14f Edward Cree 2023-06-23  50  } __packed __aligned(4);
55c1528f9b97ff Edward Cree 2023-07-28  51  #define EF4_LOOPBACK_PAYLOAD_LEN	\
55c1528f9b97ff Edward Cree 2023-07-28  52  		sizeof_field(struct ef4_loopback_payload, packet)
5a6681e22c1409 Edward Cree 2016-11-28  53  

:::::: The code at line 45 was first introduced by commit
:::::: 5a6681e22c1409089132085811857d6da828761b sfc: separate out SFC4000 ("Falcon") support into new sfc-falcon driver

:::::: TO: Edward Cree <ecree@...arflare.com>
:::::: CC: David S. Miller <davem@...emloft.net>

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