Symbol: db_cksum32
usr/src/uts/common/io/usbgem/usbgem.c
580
new->b_datap->db_cksum32 = dp->tx_seq_num;
usr/src/uts/common/sys/strsubr.h
1350
#define DB_CKSUM32(mp) ((mp)->b_datap->db_cksum32)