Function efd_get_choice

dpdk/lib/efd/rte_efd.c:312–334

* Looks up the current permutation choice for a particular bin in the online table * * @param table * EFD table to reference * @param socket_id * Socket ID to use to look up existing values (ideally caller's socket id) * @param chunk_id * Chunk ID of bin to look up * @param bin_id * Bin ID to look up * * @return * Currently active permutation choice in the online table */

 *   Currently active permutation choice in the online table
 */
static inline uint8_t
efd_get_choice(const struct rte_efd_table * const table,
		const unsigned int socket_id, const uint32_t chunk_id,
		const uint32_t bin_id)
{
	struct efd_online_chunk *chunk = &table->chunks[socket_id][chunk_id];

	/*
	 * Grab the chunk (byte) that contains the choices
	 * for four neighboring bins.
	 */
	uint8_t choice_chunk =
			chunk->bin_choice_list[bin_id / EFD_CHUNK_NUM_BIN_TO_GROUP_SETS];

	/*
	 * Compute the offset into the chunk that contains
	 * the group_id lookup position
	 */
	int offset = (bin_id & 0x3) * 2;

	/* Extract from the byte just the desired lookup position */
	return (uint8_t) ((choice_chunk >> offset) & 0x3);
}

/**
 * Compute the chunk_id and bin_id for a given key