Hi Muhammad, FYI, the error/warning still remains. tree: https://github.com/intel/linux-intel-lts.git 5.10/preempt-rt head: 87730b5bba3003ee22dcfa6d5d7b118d3d433611 commit: 765ce62a0644876bc2eb57fe84ab526f74129d6a [17465/17939] igc: Enable HW TX Timestamp for AF_XDP ZC config: ia64-allmodconfig (attached as .config) compiler: ia64-linux-gcc (GCC) 11.2.0 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/linux-intel-lts/commit/765ce62a0644876bc2eb57fe8... git remote add intel-lts https://github.com/intel/linux-intel-lts.git git fetch --no-tags intel-lts 5.10/preempt-rt git checkout 765ce62a0644876bc2eb57fe84ab526f74129d6a # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=ia64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): drivers/net/ethernet/intel/igc/igc_main.c: In function 'igc_clean_tx_irq': 2709 | ktime_t timestamp = 0; | ^~~~~~~~~ vim +/timestamp +2709 drivers/net/ethernet/intel/igc/igc_main.c 2692 2693 /** 2694 * igc_clean_tx_irq - Reclaim resources after transmit completes 2695 * @q_vector: pointer to q_vector containing needed info 2696 * @napi_budget: Used to determine if we are in netpoll 2697 * 2698 * returns true if ring is completely cleaned 2699 */ 2700 static bool igc_clean_tx_irq(struct igc_q_vector *q_vector, int napi_budget) 2701 { 2702 struct igc_adapter *adapter = q_vector->adapter; 2703 unsigned int total_bytes = 0, total_packets = 0; 2704 unsigned int budget = q_vector->tx.work_limit; 2705 struct igc_ring *tx_ring = q_vector->tx.ring; 2706 unsigned int i = tx_ring->next_to_clean; 2707 struct igc_tx_buffer *tx_buffer; 2708 union igc_adv_tx_desc *tx_desc; 2710 u32 xsk_frames = 0; 2711 2712 if (test_bit(__IGC_DOWN, &adapter->state)) 2713 return true; 2714 2715 tx_buffer = &tx_ring->tx_buffer_info[i]; 2716 tx_desc = IGC_TX_DESC(tx_ring, i); 2717 i -= tx_ring->count; 2718 2719 do { 2720 union igc_adv_tx_desc *eop_desc = tx_buffer->next_to_watch; 2721 2722 /* if next_to_watch is not set then there is no work pending */ 2723 if (!eop_desc) 2724 break; 2725 2726 /* prevent any other reads prior to eop_desc */ 2727 smp_rmb(); 2728 2729 /* if DD is not set pending work has not been completed */ 2730 if (!(eop_desc->wb.status & cpu_to_le32(IGC_TXD_STAT_DD))) 2731 break; 2732 2733 if (eop_desc->wb.status & cpu_to_le32(IGC_TXD_STAT_TS_STAT) && 2734 tx_buffer->tx_flags & IGC_TX_FLAGS_DMA_TSTAMP) { 2735 u64 tstamp = le64_to_cpu(eop_desc->wb.dma_tstamp); 2736 2737 if (tx_ring->xsk_pool && adapter->tstamp_config.tx_type == HWTSTAMP_TX_ON) 2738 timestamp = igc_tx_dma_hw_tstamp(adapter, tstamp); 2739 else 2740 igc_ptp_tx_dma_tstamp(adapter, tx_buffer->skb, tstamp); 2741 } 2742 2743 /* clear next_to_watch to prevent false hangs */ 2744 tx_buffer->next_to_watch = NULL; 2745 2746 /* update the statistics for this packet */ 2747 total_bytes += tx_buffer->bytecount; 2748 total_packets += tx_buffer->gso_segs; 2749 2750 switch (tx_buffer->type) { 2751 case IGC_TX_BUFFER_TYPE_XSK: 2752 xsk_frames++; 2753 break; 2754 case IGC_TX_BUFFER_TYPE_XDP: 2755 xdp_return_frame(tx_buffer->xdpf); 2756 igc_unmap_tx_buffer(tx_ring->dev, tx_buffer); 2757 break; 2758 case IGC_TX_BUFFER_TYPE_SKB: 2759 napi_consume_skb(tx_buffer->skb, napi_budget); 2760 igc_unmap_tx_buffer(tx_ring->dev, tx_buffer); 2761 break; 2762 default: 2763 netdev_warn_once(tx_ring->netdev, 2764 "Unknown tx buffer type\n"); 2765 break; 2766 } 2767 2768 /* clear last DMA location and unmap remaining buffers */ 2769 while (tx_desc != eop_desc) { 2770 tx_buffer++; 2771 tx_desc++; 2772 i++; 2773 if (unlikely(!i)) { 2774 i -= tx_ring->count; 2775 tx_buffer = tx_ring->tx_buffer_info; 2776 tx_desc = IGC_TX_DESC(tx_ring, 0); 2777 } 2778 2779 /* unmap any remaining paged data */ 2780 if (dma_unmap_len(tx_buffer, len)) 2781 igc_unmap_tx_buffer(tx_ring->dev, tx_buffer); 2782 } 2783 2784 /* move us one more past the eop_desc for start of next pkt */ 2785 tx_buffer++; 2786 tx_desc++; 2787 i++; 2788 if (unlikely(!i)) { 2789 i -= tx_ring->count; 2790 tx_buffer = tx_ring->tx_buffer_info; 2791 tx_desc = IGC_TX_DESC(tx_ring, 0); 2792 } 2793 2794 /* issue prefetch for next Tx descriptor */ 2795 prefetch(tx_desc); 2796 2797 /* update budget accounting */ 2798 budget--; 2799 } while (likely(budget)); 2800 2801 netdev_tx_completed_queue(txring_txq(tx_ring), 2802 total_packets, total_bytes); 2803 2804 i += tx_ring->count; 2805 tx_ring->next_to_clean = i; 2806 2807 igc_update_tx_stats(q_vector, total_packets, total_bytes); 2808 2809 if (tx_ring->xsk_pool) { 2810 if (xsk_frames) 2811 xsk_tx_completed(tx_ring->xsk_pool, xsk_frames); 2812 if (xsk_uses_need_wakeup(tx_ring->xsk_pool)) 2813 xsk_set_tx_need_wakeup(tx_ring->xsk_pool); 2814 igc_xdp_xmit_zc(tx_ring); 2815 } 2816 2817 if (test_bit(IGC_RING_FLAG_TX_DETECT_HANG, &tx_ring->flags)) { 2818 struct igc_hw *hw = &adapter->hw; 2819 2820 /* Detect a transmit hang in hardware, this serializes the 2821 * check with the clearing of time_stamp and movement of i 2822 */ 2823 clear_bit(IGC_RING_FLAG_TX_DETECT_HANG, &tx_ring->flags); 2824 if (tx_buffer->next_to_watch && 2825 time_after(jiffies, tx_buffer->time_stamp + 2826 (adapter->tx_timeout_factor * HZ)) && 2827 !(rd32(IGC_STATUS) & IGC_STATUS_TXOFF)) { 2828 /* detected Tx unit hang */ 2829 netdev_err(tx_ring->netdev, 2830 "Detected Tx Unit Hang\n" 2831 " Tx Queue <%d>\n" 2832 " TDH <%x>\n" 2833 " TDT <%x>\n" 2834 " next_to_use <%x>\n" 2835 " next_to_clean <%x>\n" 2836 "buffer_info[next_to_clean]\n" 2837 " time_stamp <%lx>\n" 2838 " next_to_watch <%p>\n" 2839 " jiffies <%lx>\n" 2840 " desc.status <%x>\n", 2841 tx_ring->queue_index, 2842 rd32(IGC_TDH(tx_ring->reg_idx)), 2843 readl(tx_ring->tail), 2844 tx_ring->next_to_use, 2845 tx_ring->next_to_clean, 2846 tx_buffer->time_stamp, 2847 tx_buffer->next_to_watch, 2848 jiffies, 2849 tx_buffer->next_to_watch->wb.status); 2850 netif_stop_subqueue(tx_ring->netdev, 2851 tx_ring->queue_index); 2852 2853 /* we are about to reset, no point in enabling stuff */ 2854 return true; 2855 } 2856 } 2857 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org