M_TIMERBACKOFFINDEX0
#define G_TIMERBACKOFFINDEX0(x) (((x) >> S_TIMERBACKOFFINDEX0) & M_TIMERBACKOFFINDEX0)
#define G_TIMERBACKOFFINDEX0(x) (((x) >> S_TIMERBACKOFFINDEX0) & M_TIMERBACKOFFINDEX0)
v = (t4_read_reg(sc, r) >> shift) & M_TIMERBACKOFFINDEX0;
v = t4_toe_rexmt_backoff[i] & M_TIMERBACKOFFINDEX0;
M_TIMERBACKOFFINDEX0 << shift, v << shift);