More comments inline:
On Tue, Jul 9, 2019 at 9:16 PM Xiao Zhang <xiao.zh...@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.zh...@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
>
