AGE_SMB_BLOCK_SZ
AGE_SMB_BLOCK_SZ, age_dmamap_cb, &ctx, 0);
bzero(rd->age_smb_block, AGE_SMB_BLOCK_SZ);
smb_block_end = sc->age_rdata.age_smb_block_paddr + AGE_SMB_BLOCK_SZ;
AGE_SMB_BLOCK_SZ, /* maxsize */
AGE_SMB_BLOCK_SZ, /* maxsegsize */