On 4/8/21 10:35 PM, Cacheco Gnudu wrote:
Hello everyone,I'm programming a testbed with DPDK that needs to create a hashmap with 32768 entries and maybe more in the future. To create it, I use rte_hash_add_key_data() inside a for loop. I was checking the return value of rte_hash_add_key_data() and whenever it was negative, the program would terminate with rte_exit(). Every time it added the 32224th entry it would terminate with -ENOSPC. I replaced rte_exit() to a simple printf() to let me know it received a negative value from rte_hash_add_key_data(), but would keep adding new entries and it does. It alternatively succeeds and fails, and when it fails its always with -ENOSPC. At the end only 32640 entries are added. I pasted the hash creation code and the end of the execution output as well. --- code starts here --- /* ... */ #define MAX_IPS 32768 /* ... */ int err = 0; static struct rte_hash *PPVE_HASHMAP; struct rte_hash_parameters params = { 0 }; params.name = "ip_filter_hashmap"; params.entries = MAX_IPS; params.key_len = sizeof(uint64_t); params.hash_func = rte_jhash; params.hash_func_init_val = 0; params.socket_id = rte_socket_id(); uint32_t size = rte_hash_count(PPVE_HASHMAP); printf("%d\n", size); PPVE_HASHMAP = rte_hash_create(¶ms); if (PPVE_HASHMAP == NULL) rte_exit(EXIT_DPDK_FAIL, "Failed to create hash table, errno = %d\n", rte_errno); size = rte_hash_count(PPVE_HASHMAP); printf("%d\n", size); uint64_t key = 10, value = 0xdead; for (int i = 0; i < MAX_IPS; i++) { err = rte_hash_add_key_data(PPVE_HASHMAP, &key, &value); uint32_t size = rte_hash_count(PPVE_HASHMAP); printf("%d\n", size); if (err < 0) rte_exit(EXIT_DPDK_FAIL, "Failed to add entry to hash table, err: %d\n", err); key++; } /* ... */ --- code ends here --- --- end of program output starts here --- 32635 32635 Failed to add entry to hash table, err: -28 32636 32637 32638 32639 32639 Failed to add entry to hash table, err: -28 32640 32640 Failed to add entry to hash table, err: -28 32640 Failed to add entry to hash table, err: -28 32640 Failed to add entry to hash table, err: -28 32640 Failed to add entry to hash table, err: -28 32640 Failed to add entry to hash table, err: -28 32640 Failed to add entry to hash table, err: -28 32640 Failed to add entry to hash table, err: -28 32640 Failed to add entry to hash table, err: -28 32640 Failed to add entry to hash table, err: -28 --- end of program output ends here ---
I was trying some workarounds and used params.entries = MAX_IPS+1; Apparently it worked, rte_hash_add_key_data() can add all entries now, I'm just not sure if this approach is exactly correct. If anyone has any suggestions let me know. -- Sincerely, Cacheco
