e1000: Fix RSS if enabled in mid-connection

    rar_low = ((uint32_t) addr[0] |

               ((uint32_t) addr[1] << 8) |

               ((uint32_t) addr[2] << 16) | ((uint32_t) addr[3] << 24));

    rar_high = ((uint32_t) addr[4] | ((uint32_t) addr[5] << 8) | E1000_RAH_AV);

    rar_high = ((uint32_t) addr[4] | ((uint32_t) addr[5] << 8));

    /* Disable Rx and flush all Rx frames before enabling RSS to avoid Rx

     * unit hang.

     *

     * Description:

     * If there are any Rx frames queued up or otherwise present in the HW

     * before RSS is enabled, and then we enable RSS, the HW Rx unit will

     * hang.  To work around this issue, we have to disable receives and

     * flush out all Rx frames before we enable RSS. To do so, we modify we

     * redirect all Rx traffic to manageability and then reset the HW.

     * This flushes away Rx frames, and (since the redirections to

     * manageability persists across resets) keeps new ones from coming in

     * while we work.  Then, we clear the Address Valid AV bit for all MAC

     * addresses and undo the re-direction to manageability.

     * Now, frames are coming in again, but the MAC won't accept them, so

     * far so good.  We now proceed to initialize RSS (if necessary) and

     * configure the Rx unit.  Last, we re-enable the AV bits and continue

     * on our merry way.

     */

    switch (hw->mac_type) {

    case e1000_82571:

    case e1000_82572:

        if (hw->leave_av_bit_off == TRUE)

            break;

    default:

        /* Indicate to hardware the Address is Valid. */

        rar_high |= E1000_RAH_AV;

        break;

    }

    E1000_WRITE_REG_ARRAY(hw, RA, (index << 1), rar_low);

    E1000_WRITE_REG_ARRAY(hw, RA, ((index << 1) + 1), rar_high);

    boolean_t ifs_params_forced;

    boolean_t in_ifs_mode;

    boolean_t mng_reg_access_disabled;

    boolean_t leave_av_bit_off;

};