static void *pkt_processing_loop(void *arg) {
while(1) {
queuing_pkt_t *q_pkt = (queuing_pkt_t *) cb_read(rmt_queuing_cb);
buffered_pkt_t *b_pkt = &q_pkt->pkt;
RMT_LOG(P4_LOG_LEVEL_TRACE, "queuing system: packet dequeued\n");
memset(metadata, 0, ${bytes});
metadata_extract(metadata, q_pkt->metadata, q_pkt->metadata_recirc);
/* after this point, no one should use q_pkt->metadata */
int mirror_id = metadata_get_clone_spec(metadata);
metadata_set_clone_spec(metadata, 0);
int egress_port;
//:: if enable_pre:
if (pre_replication(q_pkt, metadata)) {
continue;
}
//:: #endif
if(mirror_id == 0) {
egress_port = metadata_get_egress_spec(metadata);
/* TODO: formalize somewhere that 511 is the drop port for this target */
//:: if "ingress_drop_ctl" in extra_metadata_name_map:
// program uses the separate ingress_drop_ctl register
// a non-zero value means drop
if(egress_port = 511 || metadata_get_ingress_drop_ctl(metadata)) {
//:: else:
if(egress_port == 511) {
//:: #endif
RMT_LOG(P4_LOG_LEVEL_VERBOSE, "dropping packet at ingress\n");
free(b_pkt->pkt_data);
free(q_pkt->metadata);
free(q_pkt->metadata_recirc);
free(q_pkt);
continue;
}
}
else {
RMT_LOG(P4_LOG_LEVEL_VERBOSE, "mirror id is %d\n", mirror_id);
egress_port = ${pd_prefix}mirroring_mapping_get_egress_port(mirror_id);
if (egress_port < 0) {
RMT_LOG(P4_LOG_LEVEL_WARN,
"no mapping for mirror id %d, dropping packet\n", mirror_id);
free(b_pkt->pkt_data);
free(q_pkt->metadata);
free(q_pkt->metadata_recirc);
free(q_pkt);
continue;
}
RMT_LOG(P4_LOG_LEVEL_TRACE,
"queuing system: cloned packet, mirror_id -> egress_port : %d -> %d\n",
mirror_id, egress_port);
}
metadata_set_egress_port(metadata, egress_port);
RMT_LOG(P4_LOG_LEVEL_TRACE, "egress port set to %d\n", egress_port);
pkt_instance_type_t instance_type = b_pkt->instance_type;
metadata_set_instance_type(metadata, instance_type);
RMT_LOG(P4_LOG_LEVEL_TRACE, "instance type set to %d\n", instance_type);
//:: if enable_intrinsic:
/* Set enqueue metadata */
metadata_set_enq_qdepth(metadata, egress_pipeline_count(egress_port));
metadata_set_enq_timestamp(metadata, get_timestamp());
//:: #endif
metadata_dump(q_pkt->metadata, metadata);
egress_pipeline_receive(egress_port,
q_pkt->metadata, q_pkt->metadata_recirc,
b_pkt->pkt_data, b_pkt->pkt_len, b_pkt->pkt_id,
b_pkt->instance_type);
free(q_pkt);
}
return NULL;
}
int egress_pipeline_receive(int egress,
uint8_t *metadata,
int *metadata_recirc,
void *pkt, int len, uint64_t packet_id,
pkt_instance_type_t instance_type) {
pipeline_t *pipeline = egress_pipeline_instances[egress %
NB_THREADS_PER_PIPELINE];
egress_pkt_t *e_pkt = malloc(sizeof(egress_pkt_t));
buffered_pkt_t *b_pkt = &e_pkt->pkt;
e_pkt->egress = egress;
e_pkt->metadata = metadata;
e_pkt->metadata_recirc = metadata_recirc;
b_pkt->instance_type = instance_type;
b_pkt->pkt_data = pkt;
b_pkt->pkt_len = len;
b_pkt->pkt_id = packet_id;
//:: if enable_intrinsic:
//:: bytes = 0
//:: for header_instance in ordered_header_instances_non_virtual:
//:: h_info = header_info[header_instance]
//:: is_metadata = h_info["is_metadata"]
//:: if is_metadata: bytes += h_info["byte_width_phv"]
//:: #endfor
uint8_t extracted_metadata[${bytes}];
metadata_extract(extracted_metadata, metadata, NULL); /* NULL ? */
uint32_t deflect_on_drop = metadata_get_deflect_on_drop(extracted_metadata);
if (!deflect_on_drop) {
int ret = cb_write(pipeline->cb_in, e_pkt);
if (ret == 0) {
free(e_pkt);
RMT_LOG(P4_LOG_LEVEL_TRACE, "egress_pipeline: dropped a packet from tail\n");
}
} else {
// For negative mirroring based on Qfull,
// Set the deflection_flag in metadata to indicate that this packet
// is moving thru' the queuing system only to get delivered to
// negative mirror session.
// Egress pipeline should act on the deflection_flag and perform
// explicit e2e mirroing as appropriate
RMT_LOG(P4_LOG_LEVEL_TRACE, "egress_pipeline: deflect tail-dropped packet %p\n", metadata);
metadata_set_deflection_flag(extracted_metadata, 1);
metadata_set_deflect_on_drop(extracted_metadata, 0);
metadata_set_egress_spec(extracted_metadata, 0);
metadata_set_egress_port(extracted_metadata, 0);
metadata_dump(metadata, extracted_metadata);
int ret = cb_write(pipeline->cb_in, e_pkt);
if (ret ==0) {
free(e_pkt);
RMT_LOG(P4_LOG_LEVEL_TRACE, "egress_pipeline: could not enqueue a deflected packet\n");
}
}
//:: #endif
//:: if not enable_intrinsic:
int ret = cb_write(pipeline->cb_in, e_pkt);
if (ret == 0) {
free(e_pkt);
RMT_LOG(P4_LOG_LEVEL_TRACE, "egress_pipeline: dropped a packet from tail\n");
}
//:: #endif
return 0;
}