next_slave
if (++master->next_slave >= nmbr_bits)
master->next_slave = 0;
slave = master->next_slave;
if (!first && slave >= master->next_slave)
priv->mfunc.master.next_slave = 0;
u32 next_slave; /* mlx4_master_comm_channel */
return next_slave(m);
return next_slave(m);