4 * @brief global data used from different modules in frescan
15 * In order to simplify we have a single module, frescan_data, to store the
16 * main internal structures and global data of the FRESCAN protocol.
20 * See MaRTE OS license
24 #ifndef _MARTE_FRESCAN_DATA_H_
25 #define _MARTE_FRESCAN_DATA_H_
27 #include <stdint.h> // uint32_t
28 #include <semaphore.h> // sem_t
29 #include <time.h> // struct timespec, timer_t
30 #include "fosa_threads_and_signals.h" // fosa_thread_id_t
32 #include <misc/linux_list.h> // struct list_head
33 #include <misc/freelist.h> // freelist_t
35 #include "frescan.h" // frescan_node_t, _prio_t, _budget_t
36 #include "frescan_config.h" // FRESCAN_MLOCK_T, FRESCAN_MX_XXX
37 #include "frescan_packets.h" // frescan_packet_t
40 * frescan_repl_op_t - a replenishment operation
42 * @when: when the replenishment operation is programmed at
43 * @amount: number of frames to add to the current_budget
44 * @repl_list: to chain the replenishments for a certain sporadic server
45 * @pool_pos: to know how to free it from the replenishment pool
50 frescan_budget_t amount;
51 struct list_head repl_list;
56 * frescan_server_params_t - server parameters
58 * @budget: the budget in CAN 8-byte frames
59 * @period: the replenishment period for the server
60 * @prio: the priority for the server TODO: this should be a return value
64 frescan_budget_t budget;
65 struct timespec period;
66 } frescan_budget_period_t;
69 frescan_budget_period_t values;
71 } frescan_server_params_t;
74 * frescan_server_data_t - server data
76 * @params: the fixed parameters (budget, period and priority)
77 * @current_budget: the current available capacity
78 * @current_priority: the current priority (0=background)
79 * @repl_list: the list of pending replenishment operations
80 * @repl_timer: the timer for the replenishments associated to this server
81 * NOTE: we could use a single timer for all but for now this is simpler
82 * @act_time: the last activation time for the server
83 * @packet_list: the packets enqueued on this server
84 * @servers_list: the list of servers
88 frescan_server_params_t params;
89 frescan_network_t net;
91 frescan_budget_t current_budget;
92 frescan_prio_t current_priority;
93 frescan_budget_t pending_packets;
94 frescan_repl_op_t replenishments;
96 struct timespec act_time;
97 frescan_packet_t packet_list;
98 struct list_head servers_list;
99 } frescan_server_data_t;
102 * the_servers_pool - pool of servers structure
105 extern frescan_server_data_t the_servers_pool[FRESCAN_MX_NETWORKS][FRESCAN_MX_IDS];
106 extern freelist_t the_servers_pool_freelist[FRESCAN_MX_NETWORKS];
107 extern frescan_server_data_t the_active_servers[FRESCAN_MX_NETWORKS];
114 frescan_budget_period_t min_values;
115 frescan_budget_period_t max_values;
117 } frescan_contract_t;
120 * frescan_prio_queue_t - priority queue
122 * FRESCAN priority queues are implemented as an array of one 'fifo_queue' for
123 * each priority. Where the 'fifo_queues' are implemented using the
124 * 'struct list_head fifo_list;' field of each packet structure (Linux lists).
126 * So far mutual exclusion is achieved by disabling interrupts and
127 * synchronization is done using a semaphore. This is because the queues
128 * are accesed concurrently from user threads and the IRQ handler.
130 * @net: the network this priority queue belongs to (mainly for locking)
131 * @fifo_queues: an array of packets for each priority where each packet
132 * is just the head of a fifo_list. The array is allocated
133 * from the heap, using malloc, at initialization with range
135 * @max_prio: defines the number of priorities as (0 .. max_prio - 1)
136 * @sem: semaphore used for synchronization
140 frescan_network_t net;
141 frescan_packet_t *fifo_queues;
144 } frescan_prio_queue_t;
147 * frescan_queues_t - the set of FRESCAN queues for each instance of a protocol
149 * @tx_fp_queue: priority queue for the fixed priority packets
150 * @rx_channel_queues: a priority queue for each receiving channel
152 * TODO: add here the sporadic server queues...
156 frescan_prio_queue_t *tx_fp_queue;
157 frescan_prio_queue_t **rx_channel_queues;
158 uint32_t num_rx_channels;
162 * frescan_network_data_t - data for each network instance
164 * @local_node: the local node id for that network. The implementation does not
165 * support several interfaces for the same network.
166 * @fd: file descriptor associated to /dev/canXX
167 * @repl_thread_id: replenishment thread id
168 * @manager_thread_id: manager thread id
169 * @acceptor_thread_id: acceptor thread id
170 * @neg_messages_ss_id: sporadic server for negotiation messages
171 * @queues: the queues of this network instance
172 * @last_packet: pointer to the last packet from which a frame was inserted
173 * in the chip and its transmission is not complete.
174 * @last_packet_prio: prio of the packet in the buffer
175 * @id_queues: queues to store received packets while the whole message is
176 * not complete (fragmentation). (id = 0 .. FRESCAN_MX_IDS - 1)
177 * @id_fp_queues: the same as id_queues but for fp messages, which have
178 * id=FRESCAN_MX_IDS and are distinguised through their
181 * the implementation can handle several FRESCAN networks at the same time
182 * in the same node, so we need a place to store its internal data. The data
183 * is allocated as an array where the index is the MINOR number (which also
184 * identifies the /dev/canx device for that network)
188 FRESCAN_MLOCK_T lock;
189 frescan_node_t local_node;
191 fosa_thread_id_t repl_thread_id;
192 fosa_thread_id_t manager_thread_id;
193 fosa_thread_id_t acceptor_thread_id;
194 frescan_ss_t neg_messages_ss_id;
195 frescan_queues_t queues;
196 frescan_packet_t *last_packet;
197 frescan_prio_t last_packet_prio;
198 frescan_packet_t *id_queues[FRESCAN_MX_IDS]; // TODO: alloc at init
199 frescan_packet_t *id_fp_queues[FRESCAN_MX_PRIOS]; // TODO: alloc at init
200 } frescan_network_data_t;
202 extern frescan_network_data_t the_networks[FRESCAN_MX_NETWORKS];
205 * frescan_data_init() - init the data global variables
209 extern int frescan_data_init(int fd, frescan_init_params_t *params);
213 #endif // _MARTE_FRESCAN_DATA_H_