Re: [PATCH bpf-next v4 1/3] bpf: Add skb dynptrs

[kernel test robot <lkp@intel.com>]

Hi Joanne,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on bpf-next/master]

url:    https://github.com/intel-lab-lkp/linux/commits/Joanne-Koong/Add-skb-xdp-dynptrs/20220823-080022
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
config: csky-randconfig-r022-20220823 (https://download.01.org/0day-ci/archive/20220824/202208240751.BRPS1SoF-lkp@intel.com/config)
compiler: csky-linux-gcc (GCC) 12.1.0
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/intel-lab-lkp/linux/commit/a2c8a74d8f0b7fd0b0008dc9bc5ccf9887317f36
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Joanne-Koong/Add-skb-xdp-dynptrs/20220823-080022
        git checkout a2c8a74d8f0b7fd0b0008dc9bc5ccf9887317f36
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=csky SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   csky-linux-ld: kernel/bpf/helpers.o: in function `____bpf_dynptr_read':
>> kernel/bpf/helpers.c:1543: undefined reference to `__bpf_skb_load_bytes'
   csky-linux-ld: kernel/bpf/helpers.o: in function `bpf_dynptr_read':
   kernel/bpf/helpers.c:1522: undefined reference to `__bpf_skb_load_bytes'
   csky-linux-ld: kernel/bpf/helpers.o: in function `____bpf_dynptr_write':
>> kernel/bpf/helpers.c:1584: undefined reference to `__bpf_skb_store_bytes'
   csky-linux-ld: kernel/bpf/helpers.o: in function `bpf_dynptr_write':
   kernel/bpf/helpers.c:1561: undefined reference to `__bpf_skb_store_bytes'


vim +1543 kernel/bpf/helpers.c

  1521	
  1522	BPF_CALL_5(bpf_dynptr_read, void *, dst, u32, len, struct bpf_dynptr_kern *, src,
  1523		   u32, offset, u64, flags)
  1524	{
  1525		enum bpf_dynptr_type type;
  1526		int err;
  1527	
  1528		if (!src->data || flags)
  1529			return -EINVAL;
  1530	
  1531		err = bpf_dynptr_check_off_len(src, offset, len);
  1532		if (err)
  1533			return err;
  1534	
  1535		type = bpf_dynptr_get_type(src);
  1536	
  1537		switch (type) {
  1538		case BPF_DYNPTR_TYPE_LOCAL:
  1539		case BPF_DYNPTR_TYPE_RINGBUF:
  1540			memcpy(dst, src->data + src->offset + offset, len);
  1541			return 0;
  1542		case BPF_DYNPTR_TYPE_SKB:
> 1543			return __bpf_skb_load_bytes(src->data, src->offset + offset, dst, len);
  1544		default:
  1545			WARN(true, "bpf_dynptr_read: unknown dynptr type %d\n", type);
  1546			return -EFAULT;
  1547		}
  1548	}
  1549	
  1550	static const struct bpf_func_proto bpf_dynptr_read_proto = {
  1551		.func		= bpf_dynptr_read,
  1552		.gpl_only	= false,
  1553		.ret_type	= RET_INTEGER,
  1554		.arg1_type	= ARG_PTR_TO_UNINIT_MEM,
  1555		.arg2_type	= ARG_CONST_SIZE_OR_ZERO,
  1556		.arg3_type	= ARG_PTR_TO_DYNPTR,
  1557		.arg4_type	= ARG_ANYTHING,
  1558		.arg5_type	= ARG_ANYTHING,
  1559	};
  1560	
  1561	BPF_CALL_5(bpf_dynptr_write, struct bpf_dynptr_kern *, dst, u32, offset, void *, src,
  1562		   u32, len, u64, flags)
  1563	{
  1564		enum bpf_dynptr_type type;
  1565		int err;
  1566	
  1567		if (!dst->data || bpf_dynptr_is_rdonly(dst))
  1568			return -EINVAL;
  1569	
  1570		err = bpf_dynptr_check_off_len(dst, offset, len);
  1571		if (err)
  1572			return err;
  1573	
  1574		type = bpf_dynptr_get_type(dst);
  1575	
  1576		switch (type) {
  1577		case BPF_DYNPTR_TYPE_LOCAL:
  1578		case BPF_DYNPTR_TYPE_RINGBUF:
  1579			if (flags)
  1580				return -EINVAL;
  1581			memcpy(dst->data + dst->offset + offset, src, len);
  1582			return 0;
  1583		case BPF_DYNPTR_TYPE_SKB:
> 1584			return __bpf_skb_store_bytes(dst->data, dst->offset + offset, src, len,
  1585						     flags);
  1586		default:
  1587			WARN(true, "bpf_dynptr_write: unknown dynptr type %d\n", type);
  1588			return -EFAULT;
  1589		}
  1590	}
  1591	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp