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Date: Fri, 17 Nov 2023 11:44:41 -0800
From: Coco Li <lixiaoyan@...gle.com>
To: kernel test robot <lkp@...el.com>
Cc: Jakub Kicinski <kuba@...nel.org>, Eric Dumazet <edumazet@...gle.com>,
Neal Cardwell <ncardwell@...gle.com>, Mubashir Adnan Qureshi <mubashirq@...gle.com>,
Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew@...n.ch>, Jonathan Corbet <corbet@....net>,
David Ahern <dsahern@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, llvm@...ts.linux.dev,
oe-kbuild-all@...ts.linux.dev, netdev@...r.kernel.org,
Chao Wu <wwchao@...gle.com>, Wei Wang <weiwan@...gle.com>,
Pradeep Nemavat <pnemavat@...gle.com>
Subject: Re: [PATCH v7 net-next 4/5] net-device: reorganize net_device fast
path variables
Spending some time setting up a clang17 compatible environment, will
update soon.
On Thu, Nov 16, 2023 at 4:40 AM kernel test robot <lkp@...el.com> wrote:
>
> Hi Coco,
>
> kernel test robot noticed the following build errors:
>
> [auto build test ERROR on net-next/main]
>
> url: https://github.com/intel-lab-lkp/linux/commits/Coco-Li/Documentations-Analyze-heavily-used-Networking-related-structs/20231114-073648
> base: net-next/main
> patch link: https://lore.kernel.org/r/20231113233301.1020992-5-lixiaoyan%40google.com
> patch subject: [PATCH v7 net-next 4/5] net-device: reorganize net_device fast path variables
> config: powerpc-mpc8313_rdb_defconfig (https://download.01.org/0day-ci/archive/20231116/202311162002.m26ObVLU-lkp@intel.com/config)
> compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231116/202311162002.m26ObVLU-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/202311162002.m26ObVLU-lkp@intel.com/
>
> All errors (new ones prefixed by >>):
>
> net/core/dev.c:4079:1: warning: unused function 'sch_handle_ingress' [-Wunused-function]
> 4079 | sch_handle_ingress(struct sk_buff *skb, struct packet_type **pt_prev, int *ret,
> | ^
> net/core/dev.c:4086:1: warning: unused function 'sch_handle_egress' [-Wunused-function]
> 4086 | sch_handle_egress(struct sk_buff *skb, int *ret, struct net_device *dev)
> | ^
> net/core/dev.c:5296:19: warning: unused function 'nf_ingress' [-Wunused-function]
> 5296 | static inline int nf_ingress(struct sk_buff *skb, struct packet_type **pt_prev,
> | ^
> >> net/core/dev.c:11547:2: error: call to '__compiletime_assert_971' declared with 'error' attribute: BUILD_BUG_ON failed: offsetof(struct net_device, __cacheline_group_end__net_device_read_txrx) - offsetofend(struct net_device, __cacheline_group_begin__net_device_read_txrx) > 24
> 11547 | CACHELINE_ASSERT_GROUP_SIZE(struct net_device, net_device_read_txrx, 24);
> | ^
> include/linux/cache.h:108:2: note: expanded from macro 'CACHELINE_ASSERT_GROUP_SIZE'
> 108 | BUILD_BUG_ON(offsetof(TYPE, __cacheline_group_end__##GROUP) - \
> | ^
> include/linux/build_bug.h:50:2: note: expanded from macro 'BUILD_BUG_ON'
> 50 | BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
> | ^
> include/linux/build_bug.h:39:37: note: expanded from macro 'BUILD_BUG_ON_MSG'
> 39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
> | ^
> note: (skipping 1 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
> include/linux/compiler_types.h:423:2: note: expanded from macro '_compiletime_assert'
> 423 | __compiletime_assert(condition, msg, prefix, suffix)
> | ^
> include/linux/compiler_types.h:416:4: note: expanded from macro '__compiletime_assert'
> 416 | prefix ## suffix(); \
> | ^
> <scratch space>:11:1: note: expanded from here
> 11 | __compiletime_assert_971
> | ^
> 3 warnings and 1 error generated.
>
>
> vim +11547 net/core/dev.c
>
> 11515
> 11516 static void __init net_dev_struct_check(void)
> 11517 {
> 11518 /* TX read-mostly hotpath */
> 11519 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, priv_flags);
> 11520 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, netdev_ops);
> 11521 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, header_ops);
> 11522 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, _tx);
> 11523 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, real_num_tx_queues);
> 11524 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, gso_max_size);
> 11525 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, gso_ipv4_max_size);
> 11526 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, gso_max_segs);
> 11527 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, num_tc);
> 11528 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, mtu);
> 11529 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, needed_headroom);
> 11530 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, tc_to_txq);
> 11531 #ifdef CONFIG_XPS
> 11532 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, xps_maps);
> 11533 #endif
> 11534 #ifdef CONFIG_NETFILTER_EGRESS
> 11535 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, nf_hooks_egress);
> 11536 #endif
> 11537 #ifdef CONFIG_NET_XGRESS
> 11538 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, tcx_egress);
> 11539 #endif
> 11540 CACHELINE_ASSERT_GROUP_SIZE(struct net_device, net_device_read_tx, 152);
> 11541
> 11542 /* TXRX read-mostly hotpath */
> 11543 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_txrx, flags);
> 11544 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_txrx, hard_header_len);
> 11545 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_txrx, features);
> 11546 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_txrx, ip6_ptr);
> 11547 CACHELINE_ASSERT_GROUP_SIZE(struct net_device, net_device_read_txrx, 24);
> 11548
> 11549 /* RX read-mostly hotpath */
> 11550 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, ptype_specific);
> 11551 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, ifindex);
> 11552 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, real_num_rx_queues);
> 11553 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, _rx);
> 11554 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, gro_flush_timeout);
> 11555 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, napi_defer_hard_irqs);
> 11556 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, gro_max_size);
> 11557 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, gro_ipv4_max_size);
> 11558 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, rx_handler);
> 11559 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, rx_handler_data);
> 11560 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, nd_net);
> 11561 #ifdef CONFIG_NETPOLL
> 11562 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, npinfo);
> 11563 #endif
> 11564 #ifdef CONFIG_NET_XGRESS
> 11565 CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, tcx_ingress);
> 11566 #endif
> 11567 CACHELINE_ASSERT_GROUP_SIZE(struct net_device, net_device_read_rx, 96);
> 11568 }
> 11569
>
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki
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