7:10 p.m.
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>
All warnings (new ones prefixed by >>):
drivers/net/ethernet/intel/igc/igc_main.c: In function 'igc_clean_tx_irq':
> drivers/net/ethernet/intel/igc/igc_main.c:2709:17: warning:
variable 'timestamp' set but not used [-Wunused-but-set-variable]
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;
2709 ktime_t timestamp = 0;
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