9:57 p.m.
tree: https://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next-queue.git dev-queue
head: c929b995e9037188f8ebd7f2f8df8b60da940e0d
commit: 0345779cc859e3a8f2f727b24dfbf2a07f0683b9 [35/111] i40e: Add hardware configuration
for software based DCB
config: arc-randconfig-r036-20201217 (attached as .config)
compiler: arc-elf-gcc (GCC) 9.3.0
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://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next-queue.git/comm...
git remote add tnguy-next-queue
https://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next-queue.git
git fetch --no-tags tnguy-next-queue dev-queue
git checkout 0345779cc859e3a8f2f727b24dfbf2a07f0683b9
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arc
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/i40e/i40e_dcb.c: In function
'i40e_dcb_hw_calculate_pool_sizes':
> drivers/net/ethernet/intel/i40e/i40e_dcb.c:1639:6: warning:
'mfs_max' is used uninitialized in this function [-Wuninitialized]
1639
| u32 mfs_max;
| ^~~~~~~
vim +/mfs_max +1639 drivers/net/ethernet/intel/i40e/i40e_dcb.c
1615
1616 /**
1617 * i40e_dcb_hw_calculate_pool_sizes - configure dcb pool sizes
1618 * @hw: pointer to the hw struct
1619 * @num_ports: Number of available ports on the device
1620 * @eee_enabled: EEE enabled for the given port
1621 * @pfc_en: Bit map of PFC enabled traffic classes
1622 * @mfs_tc: Array of max frame size for each traffic class
1623 * @pb_cfg: pointer to packet buffer configuration
1624 *
1625 * Calculate the shared and dedicated per TC pool sizes,
1626 * watermarks and threshold values.
1627 **/
1628 void i40e_dcb_hw_calculate_pool_sizes(struct i40e_hw *hw,
1629 u8 num_ports, bool eee_enabled,
1630 u8 pfc_en, u32 *mfs_tc,
1631 struct i40e_rx_pb_config *pb_cfg)
1632 {
1633 u32 pool_size[I40E_MAX_TRAFFIC_CLASS];
1634 u32 high_wm[I40E_MAX_TRAFFIC_CLASS];
1635 u32 low_wm[I40E_MAX_TRAFFIC_CLASS];
1636 u32 total_pool_size = 0;
1637 int shared_pool_size; /* Need signed variable */
1638 u32 port_pb_size;
1639 u32 mfs_max;
1640 u32 pcirtt;
1641 u8 i;
1642
1643 /* Get the MFS(max) for the port */
1644 for (i = 0; i < I40E_MAX_TRAFFIC_CLASS; i++) {
1645 if (mfs_tc[i] > mfs_max)
1646 mfs_max = mfs_tc[i];
1647 }
1648
1649 pcirtt = I40E_BT2B(I40E_PCIRTT_LINK_SPEED_10G);
1650
1651 /* Calculate effective Rx PB size per port */
1652 port_pb_size = I40E_DEVICE_RPB_SIZE / num_ports;
1653 if (eee_enabled)
1654 port_pb_size -= I40E_BT2B(I40E_EEE_TX_LPI_EXIT_TIME);
1655 port_pb_size -= mfs_max;
1656
1657 /* Step 1 Calculating tc pool/shared pool sizes and watermarks */
1658 for (i = 0; i < I40E_MAX_TRAFFIC_CLASS; i++) {
1659 if (pfc_en & BIT(i)) {
1660 low_wm[i] = (I40E_DCB_WATERMARK_START_FACTOR *
1661 mfs_tc[i]) + pcirtt;
1662 high_wm[i] = low_wm[i];
1663 high_wm[i] += ((mfs_max > I40E_MAX_FRAME_SIZE)
1664 ? mfs_max : I40E_MAX_FRAME_SIZE);
1665 pool_size[i] = high_wm[i];
1666 pool_size[i] += I40E_BT2B(I40E_STD_DV_TC(mfs_max,
1667 mfs_tc[i]));
1668 } else {
1669 low_wm[i] = 0;
1670 pool_size[i] = (I40E_DCB_WATERMARK_START_FACTOR *
1671 mfs_tc[i]) + pcirtt;
1672 high_wm[i] = pool_size[i];
1673 }
1674 total_pool_size += pool_size[i];
1675 }
1676
1677 shared_pool_size = port_pb_size - total_pool_size;
1678 if (shared_pool_size > 0) {
1679 pb_cfg->shared_pool_size = shared_pool_size;
1680 pb_cfg->shared_pool_high_wm = shared_pool_size;
1681 pb_cfg->shared_pool_low_wm = 0;
1682 for (i = 0; i < I40E_MAX_TRAFFIC_CLASS; i++) {
1683 pb_cfg->shared_pool_low_thresh[i] = 0;
1684 pb_cfg->shared_pool_high_thresh[i] = shared_pool_size;
1685 pb_cfg->tc_pool_size[i] = pool_size[i];
1686 pb_cfg->tc_pool_high_wm[i] = high_wm[i];
1687 pb_cfg->tc_pool_low_wm[i] = low_wm[i];
1688 }
1689
1690 } else {
1691 i40e_debug(hw, I40E_DEBUG_DCB,
1692 "The shared pool size for the port is negative %d.\n",
1693 shared_pool_size);
1694 }
1695 }
1696
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org