Function efd_compute_update

dpdk/lib/efd/rte_efd.c:956–1157

* Computes an updated table entry where the supplied key points to a new host. * If no entry exists, one is inserted. * * This function does NOT modify the online table(s) * This function DOES modify the offline table * * @param table * EFD table to reference * @param socket_id * Socket ID to use to lookup existing values (ideally caller's socket id) * @param key * Key to insert

 *   subsequent use of the entry content will likely be invalid
 */
static inline int
efd_compute_update(struct rte_efd_table * const table,
		const unsigned int socket_id, const void *key,
		const efd_value_t value, uint32_t * const chunk_id,
		uint32_t * const group_id, uint32_t * const bin_id,
		uint8_t * const new_bin_choice,
		struct efd_online_group_entry * const entry)
{
	unsigned int i;
	int ret;
	uint32_t new_idx;
	void *new_k, *slot_id = NULL;
	int status = EXIT_SUCCESS;
	unsigned int found = 0;

	efd_compute_ids(table, key, chunk_id, bin_id);

	struct efd_offline_chunk_rules * const chunk =
			&table->offline_chunks[*chunk_id];
	struct efd_offline_group_rules *new_group;

	uint8_t current_choice = efd_get_choice(table, socket_id,
			*chunk_id, *bin_id);
	uint32_t current_group_id = efd_bin_to_group[current_choice][*bin_id];
	struct efd_offline_group_rules * const current_group =
			&chunk->group_rules[current_group_id];
	uint8_t bin_size = 0;
	uint8_t key_changed_index = 0;
	efd_value_t key_changed_previous_value = 0;
	uint32_t key_idx_previous = 0;

	/* Scan the current group and see if the key is already present */
	for (i = 0; i < current_group->num_rules; i++) {
		if (current_group->bin_id[i] == *bin_id)
			bin_size++;
		else
			continue;

		void *key_stored = EFD_KEY(current_group->key_idx[i], table);
		if (found == 0 && unlikely(memcmp(key_stored, key,
				table->key_len) == 0)) {
			/* Key is already present */

			/*
			 * If previous value is same as new value,
			 * no additional work is required
			 */
			if (current_group->value[i] == value)
				return RTE_EFD_UPDATE_NO_CHANGE;

			key_idx_previous = current_group->key_idx[i];
			key_changed_previous_value = current_group->value[i];
			key_changed_index = i;
			current_group->value[i] = value;
			found = 1;
		}
	}