MTIP_MAX_SG
sg_init_table(cmd->sg, MTIP_MAX_SG);
.max_segments = MTIP_MAX_SG,
#define AHCI_CMD_TBL_SGL_SZ (MTIP_MAX_SG * sizeof(struct mtip_cmd_sg))
struct scatterlist sg[MTIP_MAX_SG]; /* Scatter list entries */