CCCI_H_SEQ_FLD
seq_num = FIELD_GET(CCCI_H_SEQ_FLD, status);
next_seq_num = (seq_num + 1) & FIELD_MAX(CCCI_H_SEQ_FLD);
FIELD_PREP(CCCI_H_SEQ_FLD, port->seq_nums[MTK_TX]) | CCCI_H_AST_BIT;