add_32
#define atomic_add_32 ATOMIC_SAN(add_32)
req.add_32(2, 2); /* 2 -- iSCSI */
req.add_32(6, conf_isns_period);
req.add_32(33, 1); /* 1 -- Target*/
req.add_32(51, pg->tag());
void add_32(uint32_t tag, uint32_t value);