From: Ross Lagerwall ross.lagerwall@citrix.com
[ Upstream commit 96d1a731611f711f0cb82cea93363ae2ea8cb028 ]
When the VF driver does a reset, it (at least the Linux one) writes to the VFCTRL register to issue a reset and then immediately sends a reset message using the mailbox API. This is racy because when the PF driver detects that the VFCTRL register reset pin has been asserted, it clears the mailbox memory. Depending on ordering, the reset message sent by the VF could be cleared by the PF driver. It then responds to the cleared message with a NACK which causes the VF driver to malfunction. Fix this by deferring clearing the mailbox memory until the reset message is received.
Fixes: 939b701ad633 ("ixgbe: fix driver behaviour after issuing VFLR") Signed-off-by: Ross Lagerwall ross.lagerwall@citrix.com Tested-by: Andrew Bowers andrewx.bowers@intel.com Signed-off-by: Jeff Kirsher jeffrey.t.kirsher@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c index eea63a99f29c..f6ffd9fb2079 100644 --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c @@ -699,7 +699,6 @@ static inline void ixgbe_vf_reset_event(struct ixgbe_adapter *adapter, u32 vf) u8 num_tcs = adapter->hw_tcs; u32 reg_val; u32 queue; - u32 word;
/* remove VLAN filters beloning to this VF */ ixgbe_clear_vf_vlans(adapter, vf); @@ -754,6 +753,14 @@ static inline void ixgbe_vf_reset_event(struct ixgbe_adapter *adapter, u32 vf) } }
+ IXGBE_WRITE_FLUSH(hw); +} + +static void ixgbe_vf_clear_mbx(struct ixgbe_adapter *adapter, u32 vf) +{ + struct ixgbe_hw *hw = &adapter->hw; + u32 word; + /* Clear VF's mailbox memory */ for (word = 0; word < IXGBE_VFMAILBOX_SIZE; word++) IXGBE_WRITE_REG_ARRAY(hw, IXGBE_PFMBMEM(vf), word, 0); @@ -827,6 +834,8 @@ static int ixgbe_vf_reset_msg(struct ixgbe_adapter *adapter, u32 vf) /* reset the filters for the device */ ixgbe_vf_reset_event(adapter, vf);
+ ixgbe_vf_clear_mbx(adapter, vf); + /* set vf mac address */ if (!is_zero_ether_addr(vf_mac)) ixgbe_set_vf_mac(adapter, vf, vf_mac);