+static uword
+snat_out2in_worker_handoff_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ snat_main_t *sm = &snat_main;
+ vlib_thread_main_t *tm = vlib_get_thread_main ();
+ u32 n_left_from, *from, *to_next = 0;
+ static __thread vlib_frame_queue_elt_t **handoff_queue_elt_by_worker_index;
+ static __thread vlib_frame_queue_t **congested_handoff_queue_by_worker_index
+ = 0;
+ vlib_frame_queue_elt_t *hf = 0;
+ vlib_frame_t *f = 0;
+ int i;
+ u32 n_left_to_next_worker = 0, *to_next_worker = 0;
+ u32 next_worker_index = 0;
+ u32 current_worker_index = ~0;
+ u32 cpu_index = os_get_cpu_number ();
+
+ if (PREDICT_FALSE (handoff_queue_elt_by_worker_index == 0))
+ {
+ vec_validate (handoff_queue_elt_by_worker_index, tm->n_vlib_mains - 1);
+
+ vec_validate_init_empty (congested_handoff_queue_by_worker_index,
+ sm->first_worker_index + sm->num_workers - 1,
+ (vlib_frame_queue_t *) (~0));
+ }
+
+ from = vlib_frame_vector_args (frame);
+ n_left_from = frame->n_vectors;
+
+ while (n_left_from > 0)
+ {
+ u32 bi0;
+ vlib_buffer_t *b0;
+ u32 sw_if_index0;
+ u32 rx_fib_index0;
+ ip4_header_t * ip0;
+ udp_header_t * udp0;
+ snat_static_mapping_key_t key0;
+ clib_bihash_kv_8_8_t kv0, value0;
+ u8 do_handoff;
+
+ bi0 = from[0];
+ from += 1;
+ n_left_from -= 1;
+
+ b0 = vlib_get_buffer (vm, bi0);
+
+ sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
+ rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index(sw_if_index0);
+
+ ip0 = vlib_buffer_get_current (b0);
+ udp0 = ip4_next_header (ip0);
+
+ key0.addr = ip0->dst_address;
+ key0.port = udp0->dst_port;
+ key0.fib_index = rx_fib_index0;
+
+ kv0.key = key0.as_u64;
+
+ /* Ever heard of of the "user" before? */
+ if (clib_bihash_search_8_8 (&sm->worker_by_out, &kv0, &value0))
+ {
+ /* No, assign next available worker (RR) */
+ next_worker_index = sm->first_worker_index +
+ sm->workers[sm->next_worker++ % vec_len (sm->workers)];
+
+ /* Add to translated packets worker lookup */
+ kv0.value = next_worker_index;
+ clib_bihash_add_del_8_8 (&sm->worker_by_out, &kv0, 1);
+ }
+ else
+ next_worker_index = value0.value;
+
+ if (PREDICT_FALSE (next_worker_index != cpu_index))
+ {
+ if (next_worker_index != current_worker_index)
+ {
+ if (hf)
+ hf->n_vectors = VLIB_FRAME_SIZE - n_left_to_next_worker;
+
+ hf = vlib_get_worker_handoff_queue_elt (sm->fq_out2in_index,
+ next_worker_index,
+ handoff_queue_elt_by_worker_index);
+
+ n_left_to_next_worker = VLIB_FRAME_SIZE - hf->n_vectors;
+ to_next_worker = &hf->buffer_index[hf->n_vectors];
+ current_worker_index = next_worker_index;
+ }
+
+ /* enqueue to correct worker thread */
+ to_next_worker[0] = bi0;
+ to_next_worker++;
+ n_left_to_next_worker--;
+
+ if (n_left_to_next_worker == 0)
+ {
+ hf->n_vectors = VLIB_FRAME_SIZE;
+ vlib_put_frame_queue_elt (hf);
+ current_worker_index = ~0;
+ handoff_queue_elt_by_worker_index[next_worker_index] = 0;
+ hf = 0;
+ }
+ }
+ else
+ {
+ do_handoff = 0;
+ /* if this is 1st frame */
+ if (!f)
+ {
+ f = vlib_get_frame_to_node (vm, snat_out2in_node.index);
+ to_next = vlib_frame_vector_args (f);
+ }
+
+ to_next[0] = bi0;
+ to_next += 1;
+ f->n_vectors++;
+ }
+
+ if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b0->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ snat_out2in_worker_handoff_trace_t *t =
+ vlib_add_trace (vm, node, b0, sizeof (*t));
+ t->next_worker_index = next_worker_index;
+ t->do_handoff = do_handoff;
+ }
+ }
+
+ if (f)
+ vlib_put_frame_to_node (vm, snat_out2in_node.index, f);
+
+ if (hf)
+ hf->n_vectors = VLIB_FRAME_SIZE - n_left_to_next_worker;
+
+ /* Ship frames to the worker nodes */
+ for (i = 0; i < vec_len (handoff_queue_elt_by_worker_index); i++)
+ {
+ if (handoff_queue_elt_by_worker_index[i])
+ {
+ hf = handoff_queue_elt_by_worker_index[i];
+ /*
+ * It works better to let the handoff node
+ * rate-adapt, always ship the handoff queue element.
+ */
+ if (1 || hf->n_vectors == hf->last_n_vectors)
+ {
+ vlib_put_frame_queue_elt (hf);
+ handoff_queue_elt_by_worker_index[i] = 0;
+ }
+ else
+ hf->last_n_vectors = hf->n_vectors;
+ }
+ congested_handoff_queue_by_worker_index[i] =
+ (vlib_frame_queue_t *) (~0);
+ }
+ hf = 0;
+ current_worker_index = ~0;
+ return frame->n_vectors;
+}
+
+VLIB_REGISTER_NODE (snat_out2in_worker_handoff_node) = {
+ .function = snat_out2in_worker_handoff_fn,
+ .name = "snat-out2in-worker-handoff",
+ .vector_size = sizeof (u32),
+ .format_trace = format_snat_out2in_worker_handoff_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+
+ .n_next_nodes = 1,
+
+ .next_nodes = {
+ [0] = "error-drop",
+ },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (snat_out2in_worker_handoff_node, snat_out2in_worker_handoff_fn);
+
Code Review / vpp.git / commitdiff