[dpdk-dev] [v4] net/e1000: i219 unit hang issue fix on reset/close
Anand H. Krishnan
anandhkrishnan at gmail.com
Tue Jul 16 03:03:28 CEST 2019
Xiao,
I didn't hear back from you on the comments.
Thanks,
Anand
On Wed, Jul 10, 2019 at 10:18 AM Anand H. Krishnan
<anandhkrishnan at gmail.com> wrote:
>
> More comments inline:
>
> On Tue, Jul 9, 2019 at 9:16 PM Xiao Zhang <xiao.zhang at intel.com> wrote:
> >
> > Unit hang may occur if multiple descriptors are available in the rings
> > during reset or close. This state can be detected by configure status
> > by bit 8 in register. If the bit is set and there are pending descriptors
> > in one of the rings, we must flush them before reset or close.
> >
> > Signed-off-by: Xiao Zhang <xiao.zhang at intel.com>
> > ---
> > drivers/net/e1000/e1000_ethdev.h | 4 ++
> > drivers/net/e1000/igb_ethdev.c | 4 ++
> > drivers/net/e1000/igb_rxtx.c | 105 +++++++++++++++++++++++++++++++++++++++
> > 3 files changed, 113 insertions(+)
> >
> > diff --git a/drivers/net/e1000/e1000_ethdev.h b/drivers/net/e1000/e1000_ethdev.h
> > index 67acb73..349144a 100644
> > --- a/drivers/net/e1000/e1000_ethdev.h
> > +++ b/drivers/net/e1000/e1000_ethdev.h
> > @@ -35,6 +35,9 @@
> > #define IGB_MAX_RX_QUEUE_NUM 8
> > #define IGB_MAX_RX_QUEUE_NUM_82576 16
> >
> > +#define E1000_I219_MAX_RX_QUEUE_NUM 2
> > +#define E1000_I219_MAX_TX_QUEUE_NUM 2
> > +
> > #define E1000_SYN_FILTER_ENABLE 0x00000001 /* syn filter enable field */
> > #define E1000_SYN_FILTER_QUEUE 0x0000000E /* syn filter queue field */
> > #define E1000_SYN_FILTER_QUEUE_SHIFT 1 /* syn filter queue field */
> > @@ -522,5 +525,6 @@ int igb_action_rss_same(const struct rte_flow_action_rss *comp,
> > int igb_config_rss_filter(struct rte_eth_dev *dev,
> > struct igb_rte_flow_rss_conf *conf,
> > bool add);
> > +void igb_flush_desc_rings(struct rte_eth_dev *dev);
> >
> > #endif /* _E1000_ETHDEV_H_ */
> > diff --git a/drivers/net/e1000/igb_ethdev.c b/drivers/net/e1000/igb_ethdev.c
> > index 3ee28cf..845101b 100644
> > --- a/drivers/net/e1000/igb_ethdev.c
> > +++ b/drivers/net/e1000/igb_ethdev.c
> > @@ -1589,6 +1589,10 @@ eth_igb_close(struct rte_eth_dev *dev)
> > eth_igb_stop(dev);
> > adapter->stopped = 1;
> >
> > + /* Flush desc rings for i219 */
> > + if (hw->mac.type >= e1000_pch_spt)
> > + igb_flush_desc_rings(dev);
> > +
>
> I am a bit confused as to which driver handles i219. I thought it is
> the em_ethdev.c.
> Also, the place to put this code, I think is more appropriate in eth_em_stop.
>
>
> > e1000_phy_hw_reset(hw);
> > igb_release_manageability(hw);
> > igb_hw_control_release(hw);
> > diff --git a/drivers/net/e1000/igb_rxtx.c b/drivers/net/e1000/igb_rxtx.c
> > index c5606de..cad28f3 100644
> > --- a/drivers/net/e1000/igb_rxtx.c
> > +++ b/drivers/net/e1000/igb_rxtx.c
> > @@ -18,6 +18,7 @@
> > #include <rte_log.h>
> > #include <rte_debug.h>
> > #include <rte_pci.h>
> > +#include <rte_bus_pci.h>
> > #include <rte_memory.h>
> > #include <rte_memcpy.h>
> > #include <rte_memzone.h>
> > @@ -63,6 +64,10 @@
> > #define IGB_TX_OFFLOAD_NOTSUP_MASK \
> > (PKT_TX_OFFLOAD_MASK ^ IGB_TX_OFFLOAD_MASK)
> >
> > +/* PCI offset for querying descriptor ring status*/
> > +#define PCICFG_DESC_RING_STATUS 0xE4
> > +#define FLUSH_DESC_REQUIRED 0x100
> > +
> > /**
> > * Structure associated with each descriptor of the RX ring of a RX queue.
> > */
> > @@ -2962,3 +2967,103 @@ igb_config_rss_filter(struct rte_eth_dev *dev,
> >
> > return 0;
> > }
> > +
> > +static void e1000_flush_tx_ring(struct rte_eth_dev *dev)
> > +{
> > + struct e1000_hw *hw = E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
> > + volatile union e1000_adv_tx_desc *tx_desc;
> > + uint32_t tdt, tctl, txd_lower = E1000_TXD_CMD_IFCS;
> > + uint16_t size = 512;
> > + struct igb_tx_queue *txq;
> > + int i;
> > +
> > + if (dev->data->tx_queues == NULL)
> > + return;
> > + tctl = E1000_READ_REG(hw, E1000_TCTL);
> > + E1000_WRITE_REG(hw, E1000_TCTL, tctl | E1000_TCTL_EN);
> > + for (i = 0; i < dev->data->nb_tx_queues &&
> > + i < E1000_I219_MAX_TX_QUEUE_NUM; i++) {
> > + txq = dev->data->tx_queues[i];
> > + tdt = E1000_READ_REG(hw, E1000_TDT(i));
> > + if (tdt != txq->tx_tail)
> > + return;
> > + tx_desc = &txq->tx_ring[txq->tx_tail];
> > + tx_desc->read.buffer_addr = txq->tx_ring_phys_addr;
>
> Should you be using rte_cpu_to_le64 here?
>
>
> > + tx_desc->read.cmd_type_len = rte_cpu_to_le_32(txd_lower | size);
>
> There is a lower.data and upper.data that needs to be set, not this
> field AFAIR.
>
>
> > + tx_desc->read.olinfo_status = 0;
> > +
> > + rte_wmb();
> > + txq->tx_tail++;
> > + if (txq->tx_tail == txq->nb_tx_desc)
> > + txq->tx_tail = 0;
> > + rte_io_wmb();
> > + E1000_WRITE_REG(hw, E1000_TDT(i), txq->tx_tail);
>
> Should you be using E1000_PCI_REG_WRITE_RELAXED. Can you just check
> other instances of how this register is written?
>
> Thanks,
> Anand
>
>
> > + usec_delay(250);
> > + }
> > +}
> > +
> > +static void e1000_flush_rx_ring(struct rte_eth_dev *dev)
> > +{
> > + uint32_t rctl, rxdctl;
> > + struct e1000_hw *hw = E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
> > + int i;
> > +
> > + rctl = E1000_READ_REG(hw, E1000_RCTL);
> > + E1000_WRITE_REG(hw, E1000_RCTL, rctl & ~E1000_RCTL_EN);
> > + E1000_WRITE_FLUSH(hw);
> > + usec_delay(150);
> > +
> > + for (i = 0; i < dev->data->nb_rx_queues &&
> > + i < E1000_I219_MAX_RX_QUEUE_NUM; i++) {
> > + rxdctl = E1000_READ_REG(hw, E1000_RXDCTL(i));
> > + /* zero the lower 14 bits (prefetch and host thresholds) */
> > + rxdctl &= 0xffffc000;
> > +
> > + /* update thresholds: prefetch threshold to 31,
> > + * host threshold to 1 and make sure the granularity
> > + * is "descriptors" and not "cache lines"
> > + */
> > + rxdctl |= (0x1F | (1UL << 8) | E1000_RXDCTL_THRESH_UNIT_DESC);
> > +
> > + E1000_WRITE_REG(hw, E1000_RXDCTL(i), rxdctl);
> > + }
> > + /* momentarily enable the RX ring for the changes to take effect */
> > + E1000_WRITE_REG(hw, E1000_RCTL, rctl | E1000_RCTL_EN);
> > + E1000_WRITE_FLUSH(hw);
> > + usec_delay(150);
> > + E1000_WRITE_REG(hw, E1000_RCTL, rctl & ~E1000_RCTL_EN);
> > +}
> > +
> > +/**
> > + * igb_flush_desc_rings - remove all descriptors from the descriptor rings
> > + *
> > + * In i219, the descriptor rings must be emptied before resetting/closing the
> > + * HW. Failure to do this will cause the HW to enter a unit hang state which
> > + * can only be released by PCI reset on the device
> > + *
> > + */
> > +
> > +void igb_flush_desc_rings(struct rte_eth_dev *dev)
> > +{
> > + uint32_t fextnvm11, tdlen;
> > + struct e1000_hw *hw = E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
> > + struct rte_pci_device *pci_dev = RTE_ETH_DEV_TO_PCI(dev);
> > + uint32_t hang_state = 0;
> > +
> > + fextnvm11 = E1000_READ_REG(hw, E1000_FEXTNVM11);
> > + E1000_WRITE_REG(hw, E1000_FEXTNVM11,
> > + fextnvm11 | E1000_FEXTNVM11_DISABLE_MULR_FIX);
> > + tdlen = E1000_READ_REG(hw, E1000_TDLEN(0));
> > + rte_pci_read_config(pci_dev, &hang_state, sizeof(hang_state),
> > + PCICFG_DESC_RING_STATUS);
> > +
> > + /* do nothing if we're not in faulty state, or if the queue is empty */
> > + if ((hang_state & FLUSH_DESC_REQUIRED) && tdlen) {
> > + /* flush desc ring */
> > + e1000_flush_tx_ring(dev);
> > + rte_pci_read_config(pci_dev, &hang_state, sizeof(hang_state),
> > + PCICFG_DESC_RING_STATUS);
> > + if (hang_state & FLUSH_DESC_REQUIRED)
> > + e1000_flush_rx_ring(dev);
> > + }
> > +}
> > --
> > 2.7.4
> >
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