* Re: [Intel-wired-lan] [PATCH iwl-next 3/5] ice: introduce ICE_TX_TSTAMP_WORK enumeration
[not found] <20230526222158.2685796-4-jacob.e.keller@intel.com>
@ 2023-05-27 4:14 ` kernel test robot
0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2023-05-27 4:14 UTC (permalink / raw)
To: Jacob Keller, Intel Wired LAN, Anthony Nguyen; +Cc: llvm, oe-kbuild-all
Hi Jacob,
kernel test robot noticed the following build warnings:
[auto build test WARNING on 1e806efa4f2837a829044df27e1196a4fd520ba3]
url: https://github.com/intel-lab-lkp/linux/commits/Jacob-Keller/ice-handle-extts-in-the-miscellaneous-interrupt-thread/20230527-062501
base: 1e806efa4f2837a829044df27e1196a4fd520ba3
patch link: https://lore.kernel.org/r/20230526222158.2685796-4-jacob.e.keller%40intel.com
patch subject: [Intel-wired-lan] [PATCH iwl-next 3/5] ice: introduce ICE_TX_TSTAMP_WORK enumeration
config: x86_64-randconfig-x096-20230526 (https://download.01.org/0day-ci/archive/20230527/202305271105.qPWszTyo-lkp@intel.com/config)
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project f28c006a5895fc0e329fe15fead81e37457cb1d1)
reproduce (this is a W=1 build):
mkdir -p ~/bin
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/23cbd0608f6febe437dc272b1d38fe6fb96e7b7a
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Jacob-Keller/ice-handle-extts-in-the-miscellaneous-interrupt-thread/20230527-062501
git checkout 23cbd0608f6febe437dc272b1d38fe6fb96e7b7a
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang ~/bin/make.cross W=1 O=build_dir ARCH=x86_64 olddefconfig
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang ~/bin/make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/net/ethernet/intel/ice/
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202305271105.qPWszTyo-lkp@intel.com/
All warnings (new ones prefixed by >>):
>> drivers/net/ethernet/intel/ice/ice_ptp.c:670:7: warning: unused variable 'more_timestamps' [-Wunused-variable]
bool more_timestamps;
^
1 warning generated.
vim +/more_timestamps +670 drivers/net/ethernet/intel/ice/ice_ptp.c
3ad5c10bf21d1d6 Jacob Keller 2022-12-05 618
06c16d89d2cbe28 Jacob Keller 2021-06-09 619 /**
23cbd0608f6febe Jacob Keller 2023-05-26 620 * ice_ptp_process_tx_tstamp - Process Tx timestamps for a port
1229b33973c7b89 Karol Kolacinski 2022-09-16 621 * @tx: the PTP Tx timestamp tracker
06c16d89d2cbe28 Jacob Keller 2021-06-09 622 *
4b1251bdd18886c Jacob Keller 2022-07-27 623 * Process timestamps captured by the PHY associated with this port. To do
4b1251bdd18886c Jacob Keller 2022-07-27 624 * this, loop over each index with a waiting skb.
4b1251bdd18886c Jacob Keller 2022-07-27 625 *
4b1251bdd18886c Jacob Keller 2022-07-27 626 * If a given index has a valid timestamp, perform the following steps:
4b1251bdd18886c Jacob Keller 2022-07-27 627 *
d40fd60093325cd Jacob Keller 2022-12-05 628 * 1) check that the timestamp request is not stale
d40fd60093325cd Jacob Keller 2022-12-05 629 * 2) check that a timestamp is ready and available in the PHY memory bank
d40fd60093325cd Jacob Keller 2022-12-05 630 * 3) read and copy the timestamp out of the PHY register
d40fd60093325cd Jacob Keller 2022-12-05 631 * 4) unlock the index by clearing the associated in_use bit
d40fd60093325cd Jacob Keller 2022-12-05 632 * 5) check if the timestamp is stale, and discard if so
d40fd60093325cd Jacob Keller 2022-12-05 633 * 6) extend the 40 bit timestamp value to get a 64 bit timestamp value
d40fd60093325cd Jacob Keller 2022-12-05 634 * 7) send this 64 bit timestamp to the stack
4b1251bdd18886c Jacob Keller 2022-07-27 635 *
d40fd60093325cd Jacob Keller 2022-12-05 636 * Note that we do not hold the tracking lock while reading the Tx timestamp.
d40fd60093325cd Jacob Keller 2022-12-05 637 * This is because reading the timestamp requires taking a mutex that might
d40fd60093325cd Jacob Keller 2022-12-05 638 * sleep.
0dd928626392386 Jacob Keller 2022-12-05 639 *
d40fd60093325cd Jacob Keller 2022-12-05 640 * The only place where we set in_use is when a new timestamp is initiated
d40fd60093325cd Jacob Keller 2022-12-05 641 * with a slot index. This is only called in the hard xmit routine where an
d40fd60093325cd Jacob Keller 2022-12-05 642 * SKB has a request flag set. The only places where we clear this bit is this
d40fd60093325cd Jacob Keller 2022-12-05 643 * function, or during teardown when the Tx timestamp tracker is being
d40fd60093325cd Jacob Keller 2022-12-05 644 * removed. A timestamp index will never be re-used until the in_use bit for
d40fd60093325cd Jacob Keller 2022-12-05 645 * that index is cleared.
0dd928626392386 Jacob Keller 2022-12-05 646 *
0dd928626392386 Jacob Keller 2022-12-05 647 * If a Tx thread starts a new timestamp, we might not begin processing it
0dd928626392386 Jacob Keller 2022-12-05 648 * right away but we will notice it at the end when we re-queue the task.
0dd928626392386 Jacob Keller 2022-12-05 649 *
0dd928626392386 Jacob Keller 2022-12-05 650 * If a Tx thread starts a new timestamp just after this function exits, the
0dd928626392386 Jacob Keller 2022-12-05 651 * interrupt for that timestamp should re-trigger this function once
0dd928626392386 Jacob Keller 2022-12-05 652 * a timestamp is ready.
0dd928626392386 Jacob Keller 2022-12-05 653 *
d40fd60093325cd Jacob Keller 2022-12-05 654 * In cases where the PTP hardware clock was directly adjusted, some
d40fd60093325cd Jacob Keller 2022-12-05 655 * timestamps may not be able to safely use the timestamp extension math. In
d40fd60093325cd Jacob Keller 2022-12-05 656 * this case, software will set the stale bit for any outstanding Tx
d40fd60093325cd Jacob Keller 2022-12-05 657 * timestamps when the clock is adjusted. Then this function will discard
d40fd60093325cd Jacob Keller 2022-12-05 658 * those captured timestamps instead of sending them to the stack.
0dd928626392386 Jacob Keller 2022-12-05 659 *
0dd928626392386 Jacob Keller 2022-12-05 660 * If a Tx packet has been waiting for more than 2 seconds, it is not possible
0dd928626392386 Jacob Keller 2022-12-05 661 * to correctly extend the timestamp using the cached PHC time. It is
0dd928626392386 Jacob Keller 2022-12-05 662 * extremely unlikely that a packet will ever take this long to timestamp. If
0dd928626392386 Jacob Keller 2022-12-05 663 * we detect a Tx timestamp request that has waited for this long we assume
0dd928626392386 Jacob Keller 2022-12-05 664 * the packet will never be sent by hardware and discard it without reading
0dd928626392386 Jacob Keller 2022-12-05 665 * the timestamp register.
06c16d89d2cbe28 Jacob Keller 2021-06-09 666 */
23cbd0608f6febe Jacob Keller 2023-05-26 667 static void ice_ptp_process_tx_tstamp(struct ice_ptp_tx *tx)
06c16d89d2cbe28 Jacob Keller 2021-06-09 668 {
4b1251bdd18886c Jacob Keller 2022-07-27 669 struct ice_ptp_port *ptp_port;
f0ae124019faaa0 Jacob Keller 2022-12-05 @670 bool more_timestamps;
4b1251bdd18886c Jacob Keller 2022-07-27 671 struct ice_pf *pf;
10e4b4a3a3e1b70 Jacob Keller 2022-12-05 672 struct ice_hw *hw;
10e4b4a3a3e1b70 Jacob Keller 2022-12-05 673 u64 tstamp_ready;
fcc2cef37fed567 Daniel Vacek 2023-01-19 674 bool link_up;
10e4b4a3a3e1b70 Jacob Keller 2022-12-05 675 int err;
4b1251bdd18886c Jacob Keller 2022-07-27 676 u8 idx;
06c16d89d2cbe28 Jacob Keller 2021-06-09 677
4b1251bdd18886c Jacob Keller 2022-07-27 678 if (!tx->init)
23cbd0608f6febe Jacob Keller 2023-05-26 679 return;
06c16d89d2cbe28 Jacob Keller 2021-06-09 680
4b1251bdd18886c Jacob Keller 2022-07-27 681 ptp_port = container_of(tx, struct ice_ptp_port, tx);
4b1251bdd18886c Jacob Keller 2022-07-27 682 pf = ptp_port_to_pf(ptp_port);
10e4b4a3a3e1b70 Jacob Keller 2022-12-05 683 hw = &pf->hw;
10e4b4a3a3e1b70 Jacob Keller 2022-12-05 684
10e4b4a3a3e1b70 Jacob Keller 2022-12-05 685 /* Read the Tx ready status first */
10e4b4a3a3e1b70 Jacob Keller 2022-12-05 686 err = ice_get_phy_tx_tstamp_ready(hw, tx->block, &tstamp_ready);
10e4b4a3a3e1b70 Jacob Keller 2022-12-05 687 if (err)
23cbd0608f6febe Jacob Keller 2023-05-26 688 return;
4b1251bdd18886c Jacob Keller 2022-07-27 689
fcc2cef37fed567 Daniel Vacek 2023-01-19 690 /* Drop packets if the link went down */
fcc2cef37fed567 Daniel Vacek 2023-01-19 691 link_up = ptp_port->link_up;
fcc2cef37fed567 Daniel Vacek 2023-01-19 692
4b1251bdd18886c Jacob Keller 2022-07-27 693 for_each_set_bit(idx, tx->in_use, tx->len) {
4b1251bdd18886c Jacob Keller 2022-07-27 694 struct skb_shared_hwtstamps shhwtstamps = {};
6b5cbc8c4ec71e4 Sergey Temerkhanov 2022-12-05 695 u8 phy_idx = idx + tx->offset;
0dd928626392386 Jacob Keller 2022-12-05 696 u64 raw_tstamp = 0, tstamp;
fcc2cef37fed567 Daniel Vacek 2023-01-19 697 bool drop_ts = !link_up;
4b1251bdd18886c Jacob Keller 2022-07-27 698 struct sk_buff *skb;
4b1251bdd18886c Jacob Keller 2022-07-27 699
0dd928626392386 Jacob Keller 2022-12-05 700 /* Drop packets which have waited for more than 2 seconds */
0dd928626392386 Jacob Keller 2022-12-05 701 if (time_is_before_jiffies(tx->tstamps[idx].start + 2 * HZ)) {
0dd928626392386 Jacob Keller 2022-12-05 702 drop_ts = true;
0dd928626392386 Jacob Keller 2022-12-05 703
0dd928626392386 Jacob Keller 2022-12-05 704 /* Count the number of Tx timestamps that timed out */
0dd928626392386 Jacob Keller 2022-12-05 705 pf->ptp.tx_hwtstamp_timeouts++;
10e4b4a3a3e1b70 Jacob Keller 2022-12-05 706 }
0dd928626392386 Jacob Keller 2022-12-05 707
10e4b4a3a3e1b70 Jacob Keller 2022-12-05 708 /* Only read a timestamp from the PHY if its marked as ready
10e4b4a3a3e1b70 Jacob Keller 2022-12-05 709 * by the tstamp_ready register. This avoids unnecessary
10e4b4a3a3e1b70 Jacob Keller 2022-12-05 710 * reading of timestamps which are not yet valid. This is
10e4b4a3a3e1b70 Jacob Keller 2022-12-05 711 * important as we must read all timestamps which are valid
10e4b4a3a3e1b70 Jacob Keller 2022-12-05 712 * and only timestamps which are valid during each interrupt.
10e4b4a3a3e1b70 Jacob Keller 2022-12-05 713 * If we do not, the hardware logic for generating a new
10e4b4a3a3e1b70 Jacob Keller 2022-12-05 714 * interrupt can get stuck on some devices.
10e4b4a3a3e1b70 Jacob Keller 2022-12-05 715 */
10e4b4a3a3e1b70 Jacob Keller 2022-12-05 716 if (!(tstamp_ready & BIT_ULL(phy_idx))) {
10e4b4a3a3e1b70 Jacob Keller 2022-12-05 717 if (drop_ts)
0dd928626392386 Jacob Keller 2022-12-05 718 goto skip_ts_read;
10e4b4a3a3e1b70 Jacob Keller 2022-12-05 719
10e4b4a3a3e1b70 Jacob Keller 2022-12-05 720 continue;
0dd928626392386 Jacob Keller 2022-12-05 721 }
0dd928626392386 Jacob Keller 2022-12-05 722
4b1251bdd18886c Jacob Keller 2022-07-27 723 ice_trace(tx_tstamp_fw_req, tx->tstamps[idx].skb, idx);
4b1251bdd18886c Jacob Keller 2022-07-27 724
10e4b4a3a3e1b70 Jacob Keller 2022-12-05 725 err = ice_read_phy_tstamp(hw, tx->block, phy_idx, &raw_tstamp);
fcc2cef37fed567 Daniel Vacek 2023-01-19 726 if (err && !drop_ts)
4b1251bdd18886c Jacob Keller 2022-07-27 727 continue;
4b1251bdd18886c Jacob Keller 2022-07-27 728
4b1251bdd18886c Jacob Keller 2022-07-27 729 ice_trace(tx_tstamp_fw_done, tx->tstamps[idx].skb, idx);
4b1251bdd18886c Jacob Keller 2022-07-27 730
10e4b4a3a3e1b70 Jacob Keller 2022-12-05 731 /* For PHYs which don't implement a proper timestamp ready
10e4b4a3a3e1b70 Jacob Keller 2022-12-05 732 * bitmap, verify that the timestamp value is different
10e4b4a3a3e1b70 Jacob Keller 2022-12-05 733 * from the last cached timestamp. If it is not, skip this for
10e4b4a3a3e1b70 Jacob Keller 2022-12-05 734 * now assuming it hasn't yet been captured by hardware.
10e4b4a3a3e1b70 Jacob Keller 2022-12-05 735 */
10e4b4a3a3e1b70 Jacob Keller 2022-12-05 736 if (!drop_ts && tx->verify_cached &&
4b1251bdd18886c Jacob Keller 2022-07-27 737 raw_tstamp == tx->tstamps[idx].cached_tstamp)
4b1251bdd18886c Jacob Keller 2022-07-27 738 continue;
4b1251bdd18886c Jacob Keller 2022-07-27 739
10e4b4a3a3e1b70 Jacob Keller 2022-12-05 740 /* Discard any timestamp value without the valid bit set */
10e4b4a3a3e1b70 Jacob Keller 2022-12-05 741 if (!(raw_tstamp & ICE_PTP_TS_VALID))
10e4b4a3a3e1b70 Jacob Keller 2022-12-05 742 drop_ts = true;
10e4b4a3a3e1b70 Jacob Keller 2022-12-05 743
0dd928626392386 Jacob Keller 2022-12-05 744 skip_ts_read:
4b1251bdd18886c Jacob Keller 2022-07-27 745 spin_lock(&tx->lock);
10e4b4a3a3e1b70 Jacob Keller 2022-12-05 746 if (tx->verify_cached && raw_tstamp)
4b1251bdd18886c Jacob Keller 2022-07-27 747 tx->tstamps[idx].cached_tstamp = raw_tstamp;
4b1251bdd18886c Jacob Keller 2022-07-27 748 clear_bit(idx, tx->in_use);
4b1251bdd18886c Jacob Keller 2022-07-27 749 skb = tx->tstamps[idx].skb;
4b1251bdd18886c Jacob Keller 2022-07-27 750 tx->tstamps[idx].skb = NULL;
d40fd60093325cd Jacob Keller 2022-12-05 751 if (test_and_clear_bit(idx, tx->stale))
d40fd60093325cd Jacob Keller 2022-12-05 752 drop_ts = true;
4b1251bdd18886c Jacob Keller 2022-07-27 753 spin_unlock(&tx->lock);
06c16d89d2cbe28 Jacob Keller 2021-06-09 754
0dd928626392386 Jacob Keller 2022-12-05 755 /* It is unlikely but possible that the SKB will have been
0dd928626392386 Jacob Keller 2022-12-05 756 * flushed at this point due to link change or teardown.
4b1251bdd18886c Jacob Keller 2022-07-27 757 */
4b1251bdd18886c Jacob Keller 2022-07-27 758 if (!skb)
4b1251bdd18886c Jacob Keller 2022-07-27 759 continue;
4b1251bdd18886c Jacob Keller 2022-07-27 760
0dd928626392386 Jacob Keller 2022-12-05 761 if (drop_ts) {
0dd928626392386 Jacob Keller 2022-12-05 762 dev_kfree_skb_any(skb);
0dd928626392386 Jacob Keller 2022-12-05 763 continue;
0dd928626392386 Jacob Keller 2022-12-05 764 }
0dd928626392386 Jacob Keller 2022-12-05 765
4b1251bdd18886c Jacob Keller 2022-07-27 766 /* Extend the timestamp using cached PHC time */
4b1251bdd18886c Jacob Keller 2022-07-27 767 tstamp = ice_ptp_extend_40b_ts(pf, raw_tstamp);
4b1251bdd18886c Jacob Keller 2022-07-27 768 if (tstamp) {
4b1251bdd18886c Jacob Keller 2022-07-27 769 shhwtstamps.hwtstamp = ns_to_ktime(tstamp);
4b1251bdd18886c Jacob Keller 2022-07-27 770 ice_trace(tx_tstamp_complete, skb, idx);
06c16d89d2cbe28 Jacob Keller 2021-06-09 771 }
06c16d89d2cbe28 Jacob Keller 2021-06-09 772
4b1251bdd18886c Jacob Keller 2022-07-27 773 skb_tstamp_tx(skb, &shhwtstamps);
4b1251bdd18886c Jacob Keller 2022-07-27 774 dev_kfree_skb_any(skb);
4b1251bdd18886c Jacob Keller 2022-07-27 775 }
23cbd0608f6febe Jacob Keller 2023-05-26 776 }
06c16d89d2cbe28 Jacob Keller 2021-06-09 777
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0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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