Hi Xuan, kernel test robot noticed the following build warnings: [auto build test WARNING on mst-vhost/linux-next] [cannot apply to net-next/main linus/master horms-ipvs/master v6.7-rc7 next-20231222] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Xuan-Zhuo/virtio_net-rename-free_old_xmit_skbs-to-free_old_xmit/20231229-155253 base: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next patch link: https://lore.kernel.org/r/20231229073108.57778-17-xuanzhuo%40linux.alibaba.com patch subject: [PATCH net-next v3 16/27] virtio_net: xsk: tx: support xmit xsk buffer config: x86_64-randconfig-004-20231229 (https://download.01.org/0day-ci/archive/20231230/202312300834.bOCLH0Mi-lkp@xxxxxxxxx/config) compiler: gcc-12 (Debian 12.2.0-14) 12.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231230/202312300834.bOCLH0Mi-lkp@xxxxxxxxx/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@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202312300834.bOCLH0Mi-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): In function 'virtnet_xsk_xmit_one', inlined from 'virtnet_xsk_xmit_batch' at drivers/net/virtio/xsk.c:58:9, inlined from 'virtnet_xsk_xmit' at drivers/net/virtio/xsk.c:80:9: >> drivers/net/virtio/xsk.c:34:16: warning: 'virtqueue_add_outbuf' accessing 32 bytes in a region of size 8 [-Wstringop-overflow=] 34 | return virtqueue_add_outbuf(sq->vq, sq->sg, 2, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 35 | virtnet_xsk_to_ptr(desc->len), GFP_ATOMIC); | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/net/virtio/xsk.c:34:16: note: referencing argument 2 of type 'struct scatterlist[0]' In file included from include/linux/virtio_config.h:7, from include/uapi/linux/virtio_net.h:30, from include/linux/virtio_net.h:8, from drivers/net/virtio/virtio_net.h:8, from drivers/net/virtio/xsk.c:6: include/linux/virtio.h: In function 'virtnet_xsk_xmit': include/linux/virtio.h:42:5: note: in a call to function 'virtqueue_add_outbuf' 42 | int virtqueue_add_outbuf(struct virtqueue *vq, | ^~~~~~~~~~~~~~~~~~~~ vim +/virtqueue_add_outbuf +34 drivers/net/virtio/xsk.c 16 17 static int virtnet_xsk_xmit_one(struct virtnet_sq *sq, 18 struct xsk_buff_pool *pool, 19 struct xdp_desc *desc) 20 { 21 struct virtnet_info *vi; 22 dma_addr_t addr; 23 24 vi = sq->vq->vdev->priv; 25 26 addr = xsk_buff_raw_get_dma(pool, desc->addr); 27 xsk_buff_raw_dma_sync_for_device(pool, addr, desc->len); 28 29 sg_init_table(sq->sg, 2); 30 31 sg_fill_dma(sq->sg, sq->xsk.hdr_dma_address, vi->hdr_len); 32 sg_fill_dma(sq->sg + 1, addr, desc->len); 33 > 34 return virtqueue_add_outbuf(sq->vq, sq->sg, 2, 35 virtnet_xsk_to_ptr(desc->len), GFP_ATOMIC); 36 } 37 38 static int virtnet_xsk_xmit_batch(struct virtnet_sq *sq, 39 struct xsk_buff_pool *pool, 40 unsigned int budget, 41 u64 *kicks) 42 { 43 struct xdp_desc *descs = pool->tx_descs; 44 u32 nb_pkts, max_pkts, i; 45 bool kick = false; 46 int err; 47 48 /* Every xsk tx packet needs two desc(virtnet header and packet). So we 49 * use sq->vq->num_free / 2 as the limitation. 50 */ 51 max_pkts = min_t(u32, budget, sq->vq->num_free / 2); 52 53 nb_pkts = xsk_tx_peek_release_desc_batch(pool, max_pkts); 54 if (!nb_pkts) 55 return 0; 56 57 for (i = 0; i < nb_pkts; i++) { > 58 err = virtnet_xsk_xmit_one(sq, pool, &descs[i]); 59 if (unlikely(err)) 60 break; 61 62 kick = true; 63 } 64 65 if (kick && virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) 66 (*kicks)++; 67 68 return i; 69 } 70 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
