Hi all,
I have two dpdk app, one primary and one secondary. I create a hash table in the primary dpdk app like this:
static struct rte_hash_parameters ut_params = {
.name = "BufferTable2",
.entries = 1024*256,
.key_len = sizeof(uint64_t),
.hash_func = rte_jhash,
//.extra_flag=RTE_HASH_EXTRA_FLAGS_EXT_TABLE,
//.extra_flag=RTE_HASH_EXTRA_FLAGS_RW_CONCURRENCY,
};
buffer_table = rte_hash_create(&ut_params);
if (buffer_table == NULL) {
printf("UNABLE TO CREATE HASHTABLE\n");
rte_exit(EXIT_FAILURE, "UNABLE TO CREATE HASHTABLE\n");
}
and in secondary I use :
h=rte_hash_find_existing("BufferTable1");
if (!h) {
fprintf(stderr, "Failed to find existing hash table\n");
return -1;
}
int ret = rte_hash_lookup_data(buffer_table, &teid, (void**)&packet_in_bucket);
I can find the table pointer, but it gives a segmentation fault when I want to look up something or add some key value.
I cannot add a key value in the primary app, so it should be in the secondary app.
I checked rte_hash_lookup_with_hash_data and rte_hash_add_key_with_hash. these get a hash signature along with a key/value. but it also gives segfault. in this way, the hash sig should be calculated manually.
I saw this too in dpdk doc:
The use of function pointers between multiple processes running based on different compiled binaries is not supported, since the location of a given function in one process may be different from its location in a second. This prevents the librte_hash library from behaving properly as in a multi-process instance since it uses a pointer to the hash function internally.
can you explain what I should do?
dpdk version 24.03
Best,
Mohsen