4.4-stable review patch. If anyone has any objections, please let me know.
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From: Alexander Duyck alexander.h.duyck@intel.com
[ Upstream commit d14c780c11fbc10f66c43e7b64eefe87ca442bd3 ]
This change makes it so that we are much more explicit about the ordering of updates to the receive address register (RAR) table. Prior to this patch I believe we may have been updating the table while entries were still active, or possibly allowing for reordering of things since we weren't explicitly flushing writes to either the lower or upper portion of the register prior to accessing the other half.
Signed-off-by: Alexander Duyck alexander.h.duyck@intel.com Reviewed-by: Shannon Nelson shannon.nelson@oracle.com Tested-by: Andrew Bowers andrewx.bowers@intel.com Signed-off-by: Jeff Kirsher jeffrey.t.kirsher@intel.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/ethernet/intel/ixgbe/ixgbe_common.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-)
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c @@ -1814,7 +1814,12 @@ s32 ixgbe_set_rar_generic(struct ixgbe_h if (enable_addr != 0) rar_high |= IXGBE_RAH_AV;
+ /* Record lower 32 bits of MAC address and then make + * sure that write is flushed to hardware before writing + * the upper 16 bits and setting the valid bit. + */ IXGBE_WRITE_REG(hw, IXGBE_RAL(index), rar_low); + IXGBE_WRITE_FLUSH(hw); IXGBE_WRITE_REG(hw, IXGBE_RAH(index), rar_high);
return 0; @@ -1846,8 +1851,13 @@ s32 ixgbe_clear_rar_generic(struct ixgbe rar_high = IXGBE_READ_REG(hw, IXGBE_RAH(index)); rar_high &= ~(0x0000FFFF | IXGBE_RAH_AV);
- IXGBE_WRITE_REG(hw, IXGBE_RAL(index), 0); + /* Clear the address valid bit and upper 16 bits of the address + * before clearing the lower bits. This way we aren't updating + * a live filter. + */ IXGBE_WRITE_REG(hw, IXGBE_RAH(index), rar_high); + IXGBE_WRITE_FLUSH(hw); + IXGBE_WRITE_REG(hw, IXGBE_RAL(index), 0);
/* clear VMDq pool/queue selection for this RAR */ hw->mac.ops.clear_vmdq(hw, index, IXGBE_CLEAR_VMDQ_ALL);