Re: [PATCH net-next] xsk: use __xsk_rcv_zc_safe for ZC multi-buffer Rx processing

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

Hi Maciej,

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/Maciej-Fijalkowski/xsk-use-__xsk_rcv_zc_safe-for-ZC-multi-buffer-Rx-processing/20260310-222557
base:   net-next/main
patch link:    https://lore.kernel.org/r/20260310133024.422464-1-maciej.fijalkowski%40intel.com
patch subject: [PATCH net-next] xsk: use __xsk_rcv_zc_safe for ZC multi-buffer Rx processing
config: sparc64-allmodconfig (https://download.01.org/0day-ci/archive/20260311/202603110534.EYw1bSxj-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project 122f0b13a237b5024747b4ee99002590cc9a220a)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260311/202603110534.EYw1bSxj-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202603110534.EYw1bSxj-lkp@intel.com/

All errors (new ones prefixed by >>):

>> net/xdp/xsk.c:188:2: error: call to undeclared function '__xsk_rcv_zc_safe'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     188 |         __xsk_rcv_zc_safe(xs, xskb, len, contd);
         |         ^
   net/xdp/xsk.c:188:2: note: did you mean '__xsk_rcv_zc'?
   net/xdp/xsk.c:146:12: note: '__xsk_rcv_zc' declared here
     146 | static int __xsk_rcv_zc(struct xdp_sock *xs, struct xdp_buff_xsk *xskb, u32 len,
         |            ^
   1 error generated.


vim +/__xsk_rcv_zc_safe +188 net/xdp/xsk.c

   162	
   163	static int xsk_rcv_zc(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len)
   164	{
   165		struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp);
   166		u32 frags = xdp_buff_has_frags(xdp);
   167		struct xdp_buff_xsk *pos, *tmp;
   168		struct list_head *xskb_list;
   169		u32 contd = 0;
   170		u32 num_desc;
   171		int err;
   172	
   173		if (likely(!frags)) {
   174			err = __xsk_rcv_zc(xs, xskb, len, contd);
   175			if (err)
   176				goto err;
   177			return 0;
   178		}
   179	
   180		contd = XDP_PKT_CONTD;
   181		num_desc = xdp_get_shared_info_from_buff(xdp)->nr_frags + 1;
   182		if (xskq_prod_nb_free(xs->rx, num_desc) < num_desc) {
   183			xs->rx_queue_full++;
   184			err = -ENOBUFS;
   185			goto err;
   186		}
   187	
 > 188		__xsk_rcv_zc_safe(xs, xskb, len, contd);
   189		xskb_list = &xskb->pool->xskb_list;
   190		list_for_each_entry_safe(pos, tmp, xskb_list, list_node) {
   191			if (list_is_singular(xskb_list))
   192				contd = 0;
   193			len = pos->xdp.data_end - pos->xdp.data;
   194			__xsk_rcv_zc_safe(xs, pos, len, contd);
   195			list_del_init(&pos->list_node);
   196		}
   197	
   198		return 0;
   199	err:
   200		xsk_buff_free(xdp);
   201		return err;
   202	}
   203	

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