https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222996
--- Comment #16 from Wei Hu <[email protected]> --- There are two issues. 1. For FreeBSD R12 and current head branch, the passthrough support on Hyper-V Gen VM was broken by commit r330113. No devices work on these releases. I have informed [email protected] to take a look of this problem. 2. On 11.2 and earlier releases, passthrough generally works on Gen 2 FreeBSD VMs. I have checked one Intel NIC with using ig driver which works fine. However, Dmitry reported it doesn't work with Intel 82583v NIC, which uses em driver on FreeBSD. I don't have such NIC so I am using a VM that that Dmitry provided to debug this issue. Looks it fails in the routine reading NIC's MDI control register: /** * e1000_read_phy_reg_mdic - Read MDI control register * @hw: pointer to the HW structure * @offset: register offset to be read * @data: pointer to the read data * * Reads the MDI control register in the PHY at offset and stores the * information read to data. **/ s32 e1000_read_phy_reg_mdic(struct e1000_hw *hw, u32 offset, u16 *data) { struct e1000_phy_info *phy = &hw->phy; u32 i, mdic = 0; ... /* Poll the ready bit to see if the MDI read completed * Increasing the time out as testing showed failures with * the lower time out */ for (i = 0; i < (E1000_GEN_POLL_TIMEOUT * 10); i++) { usec_delay_irq(50); mdic = E1000_READ_REG(hw, E1000_MDIC); if (mdic & E1000_MDIC_READY) break; } if (!(mdic & E1000_MDIC_READY)) { DEBUGOUT("MDI Read did not complete\n"); <--- saw this message when driver's debug flag is on. return -E1000_ERR_PHY; } ... } Looks the register status never turned ready. Here is some dmesg output when the debug flag is on: em0: Lazy allocation of 0x20000 bytes rid 0x10 type 3 at 0xf8000000 em0: in em_allocate_pci_resource, bus tag is 0x1, handle is 0xfffff800f8000000 e1000_set_mac_type e1000_init_mac_ops_generic e1000_init_phy_ops_generic e1000_init_nvm_ops_generic e1000_init_function_pointers_82571 e1000_init_mac_params_82571 e1000_init_nvm_params_82571 e1000_init_phy_params_82571 e1000_get_phy_id_82571 e1000_read_phy_reg_bm2 e1000_get_hw_semaphore_82574 e1000_get_hw_semaphore_82573 e1000_read_phy_reg_mdic MDI Read did not complete <-- e1000_put_hw_semaphore_82574 e1000_put_hw_semaphore_82573 Error getting PHY ID Will update more. -- You are receiving this mail because: You are the assignee for the bug. _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-virtualization To unsubscribe, send any mail to "[email protected]"
