MLY_MAX_COMMANDS
ncmd = min(MLY_MAX_COMMANDS, sc->mly_controllerinfo->maximum_parallel_commands);
sizeof(union mly_command_packet) * MLY_MAX_COMMANDS, 1, /* maxsize, nsegments */
segsize = sizeof(struct mly_sg_entry) * MLY_MAX_COMMANDS *MLY_MAX_SGENTRIES;
#define MLY_SLOT_MAX (MLY_SLOT_START + MLY_MAX_COMMANDS)
struct mly_command mly_command[MLY_MAX_COMMANDS]; /* commands */