DRBD_A_DEVICE_STATISTICS_DEV_READ
nla = ntb[DRBD_A_DEVICE_STATISTICS_DEV_READ];
if (nla_put_u64_64bit(skb, DRBD_A_DEVICE_STATISTICS_DEV_READ, s->dev_read, 0))
[DRBD_A_DEVICE_STATISTICS_DEV_READ] = { .type = NLA_U64, },