__er32
#define er32(reg) __er32(hw, E1000_##reg)
val = __er32(&adapter->hw, reg);
regs[n] = __er32(hw, E1000_RXDCTL(n));
regs[n] = __er32(hw, E1000_TXDCTL(n));
regs[n] = __er32(hw, E1000_TARC(n));
reginfo->name, __er32(hw, reginfo->ofs));