[dpdk-dev] [PATCH v5 3/3] net/i40e: enable PCI bus master after reset

[Haiyue Wang]

The VF reset can be triggerred by the PF reset event, in this case, the
PCI bus master will be cleared, then the VF is not allowed to issue any
Memory or I/O Requests.

So after the reset event is detected, always enable the PCI bus master.
And if failed, the device or system may be in an invalid state, so keep
the VF reset state to mark it as I/O error.

Signed-off-by: Haiyue Wang <haiyue.w...@intel.com>
---
 drivers/net/i40e/i40e_ethdev_vf.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/i40e/i40e_ethdev_vf.c 
b/drivers/net/i40e/i40e_ethdev_vf.c
index cb898bdb6..bded64842 100644
--- a/drivers/net/i40e/i40e_ethdev_vf.c
+++ b/drivers/net/i40e/i40e_ethdev_vf.c
@@ -1213,7 +1213,6 @@ i40evf_check_vf_reset_done(struct rte_eth_dev *dev)
        if (i >= MAX_RESET_WAIT_CNT)
                return -1;
 
-       vf->vf_reset = false;
        vf->pend_msg &= ~PFMSG_RESET_IMPENDING;
 
        return 0;
@@ -1392,6 +1391,7 @@ i40evf_handle_pf_event(struct rte_eth_dev *dev, uint8_t 
*msg,
        switch (pf_msg->event) {
        case VIRTCHNL_EVENT_RESET_IMPENDING:
                PMD_DRV_LOG(DEBUG, "VIRTCHNL_EVENT_RESET_IMPENDING event");
+               vf->vf_reset = true;
                rte_eth_dev_callback_process(dev,
                                RTE_ETH_EVENT_INTR_RESET, NULL);
                break;
@@ -2490,6 +2490,10 @@ i40evf_dev_close(struct rte_eth_dev *dev)
        i40e_shutdown_adminq(hw);
        i40evf_disable_irq0(hw);
 
+       if (vf->vf_reset &&
+           !rte_pci_set_bus_master(RTE_ETH_DEV_TO_PCI(dev), true))
+               vf->vf_reset = false;
+
        rte_free(vf->vf_res);
        vf->vf_res = NULL;
        rte_free(vf->aq_resp);
-- 
2.31.1