Hi Alexander, 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/Alexander-Lobakin/xdp-recycle-Page-Pool-backed-skbs-built-from-XDP-frames/20230302-000635 base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master patch link: https://lore.kernel.org/r/20230301160315.1022488-2-aleksander.lobakin%40intel.com patch subject: [PATCH bpf-next v1 1/2] xdp: recycle Page Pool backed skbs built from XDP frames config: x86_64-randconfig-a014 (https://download.01.org/0day-ci/archive/20230302/202303020342.Wi2PRFFH-lkp@xxxxxxxxx/config) compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project f28c006a5895fc0e329fe15fead81e37457cb1d1) 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/a5ca5578e9bd35220be091fd02df96d492120ee3 git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review Alexander-Lobakin/xdp-recycle-Page-Pool-backed-skbs-built-from-XDP-frames/20230302-000635 git checkout a5ca5578e9bd35220be091fd02df96d492120ee3 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 olddefconfig COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Link: https://lore.kernel.org/oe-kbuild-all/202303020342.Wi2PRFFH-lkp@xxxxxxxxx/ All errors (new ones prefixed by >>): >> net/core/xdp.c:662:3: error: implicit declaration of function 'skb_mark_for_recycle' is invalid in C99 [-Werror,-Wimplicit-function-declaration] skb_mark_for_recycle(skb); ^ 1 error generated. vim +/skb_mark_for_recycle +662 net/core/xdp.c 614 615 struct sk_buff *__xdp_build_skb_from_frame(struct xdp_frame *xdpf, 616 struct sk_buff *skb, 617 struct net_device *dev) 618 { 619 struct skb_shared_info *sinfo = xdp_get_shared_info_from_frame(xdpf); 620 unsigned int headroom, frame_size; 621 void *hard_start; 622 u8 nr_frags; 623 624 /* xdp frags frame */ 625 if (unlikely(xdp_frame_has_frags(xdpf))) 626 nr_frags = sinfo->nr_frags; 627 628 /* Part of headroom was reserved to xdpf */ 629 headroom = sizeof(*xdpf) + xdpf->headroom; 630 631 /* Memory size backing xdp_frame data already have reserved 632 * room for build_skb to place skb_shared_info in tailroom. 633 */ 634 frame_size = xdpf->frame_sz; 635 636 hard_start = xdpf->data - headroom; 637 skb = build_skb_around(skb, hard_start, frame_size); 638 if (unlikely(!skb)) 639 return NULL; 640 641 skb_reserve(skb, headroom); 642 __skb_put(skb, xdpf->len); 643 if (xdpf->metasize) 644 skb_metadata_set(skb, xdpf->metasize); 645 646 if (unlikely(xdp_frame_has_frags(xdpf))) 647 xdp_update_skb_shared_info(skb, nr_frags, 648 sinfo->xdp_frags_size, 649 nr_frags * xdpf->frame_sz, 650 xdp_frame_is_frag_pfmemalloc(xdpf)); 651 652 /* Essential SKB info: protocol and skb->dev */ 653 skb->protocol = eth_type_trans(skb, dev); 654 655 /* Optional SKB info, currently missing: 656 * - HW checksum info (skb->ip_summed) 657 * - HW RX hash (skb_set_hash) 658 * - RX ring dev queue index (skb_record_rx_queue) 659 */ 660 661 if (xdpf->mem.type == MEM_TYPE_PAGE_POOL) > 662 skb_mark_for_recycle(skb); 663 664 /* Allow SKB to reuse area used by xdp_frame */ 665 xdp_scrub_frame(xdpf); 666 667 return skb; 668 } 669 EXPORT_SYMBOL_GPL(__xdp_build_skb_from_frame); 670 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests
