/*! allocate and initialize queues, etc
\param[in, out] context
\returns 1 on success, 0 on failure
*/
int arpd_init(struct thread_context *context) {
struct arpd_data *data;
int rv;
assert(context);
data = context->data;
context->msg_q = squeue_new(data->msg_q_capacity, data->msg_q_elem_size);
if (!context->msg_q)
return 0;
context->pkt_xmit_q = cqueue_spsc_new(data->xmit_q_capacity,
data->xmit_q_elem_size);
if (!context->pkt_xmit_q) {
squeue_delete(&context->msg_q);
return 0;
}
rv = xmit_queue_init(context->pkt_xmit_q, &context->shared->inet_info->addr,
&context->shared->if_info->mac);
if (!rv) {
squeue_delete(&context->msg_q);
return 0;
}
context->pkt_recv_q = tqueue_new(data->recv_q_transactions,
data->recv_q_actions_per_transaction);
if (!context->pkt_recv_q) {
squeue_delete(&context->msg_q);
cqueue_spsc_delete(&context->pkt_xmit_q);
return 0;
}
data->arp_cache = arp_cache_new(context);
if (!data->arp_cache) {
squeue_delete(&context->msg_q);
cqueue_spsc_delete(&context->pkt_xmit_q);
tqueue_delete(&context->pkt_recv_q);
return 0;
}
return 1;
}
void tqueue_delete(tqueue **p) {
tqueue *q = *p;
if (!q)
return;
if (q->transactions)
cqueue_spsc_delete(&q->transactions);
free(q);
*p = NULL;
}
int spsc_new_pass() {
cqueue_spsc *q;
ptrdiff_t d;
q = cqueue_spsc_new(26, LEVEL1_DCACHE_LINESIZE-sizeof(size_t));
assert(q);
assert(q->capacity == 32); // round up to power of 2
assert(q->elem_size == LEVEL1_DCACHE_LINESIZE); // round up to cacheline
// check initialization
assert(q->push_idx == 0);
assert(q->pop_idx == 0);
for(size_t i=0; i < q->capacity; i++) {
size_t used = *(size_t *)(q->array + i*q->elem_size);
assert(used == 0);
}
// check struct layout
d = ((char *)(void *)q - (char *)(void *)&q->capacity);
assert(d == 0); // capacity is the first member
d = (char *)(void *)&q->push_idx - (char*)(void *)&q->capacity;
assert(d == LEVEL1_DCACHE_LINESIZE); // should be 1 cacheline due to padding
d = (char *)(void *)&q->pop_idx - (char *)(void *)&q->push_idx;
assert(d == LEVEL1_DCACHE_LINESIZE); // should be 1 cacheline due to padding
// check deletion
cqueue_spsc_delete(&q);
assert(!q);
// check elem_size padding rounding up
q = cqueue_spsc_new(26, LEVEL1_DCACHE_LINESIZE-sizeof(size_t)+1);
assert(q);
assert(q->elem_size == 2*LEVEL1_DCACHE_LINESIZE); // round up to 2 cachelines
return 1;
}
