[dpdk-dev] [PATCH v8 4/5] examples/l3fwd: implement FIB lookup method

[Conor Walsh <conor.walsh@intel.com>]

This patch implements the Forwarding Information Base (FIB) library
in l3fwd using the function calls and infrastructure introduced in
the previous patch.

Signed-off-by: Conor Walsh <conor.walsh@intel.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
Acked-by: Vladimir Medvedkin <vladimir.medvedkin@intel.com>
---
 examples/l3fwd/l3fwd_fib.c | 480 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 474 insertions(+), 6 deletions(-)

diff --git a/examples/l3fwd/l3fwd_fib.c b/examples/l3fwd/l3fwd_fib.c
index eb5bc2de5b..c7d7689a94 100644
--- a/examples/l3fwd/l3fwd_fib.c
+++ b/examples/l3fwd/l3fwd_fib.c
@@ -2,59 +2,527 @@
  * Copyright(c) 2021 Intel Corporation
  */
 
+#include <stdio.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+
 #include <rte_fib.h>
 #include <rte_fib6.h>
 
 #include "l3fwd.h"
+#if defined RTE_ARCH_X86
+#include "l3fwd_sse.h"
+#elif defined __ARM_NEON
+#include "l3fwd_neon.h"
+#elif defined RTE_ARCH_PPC_64
+#include "l3fwd_altivec.h"
+#endif
 #include "l3fwd_event.h"
 #include "l3fwd_route.h"
 
+/* Configure how many packets ahead to prefetch for fib. */
+#define FIB_PREFETCH_OFFSET 4
+
+/* A non-existent portid is needed to denote a default hop for fib. */
+#define FIB_DEFAULT_HOP 999
+
+/*
+ * If the machine has SSE, NEON or PPC 64 then multiple packets
+ * can be sent at once if not only single packets will be sent
+ */
+#if defined RTE_ARCH_X86 || defined __ARM_NEON \
+		|| defined RTE_ARCH_PPC_64
+#define FIB_SEND_MULTI
+#endif
+
+static struct rte_fib *ipv4_l3fwd_fib_lookup_struct[NB_SOCKETS];
+static struct rte_fib6 *ipv6_l3fwd_fib_lookup_struct[NB_SOCKETS];
+
+/* Parse packet type and ip address. */
+static inline void
+fib_parse_packet(struct rte_mbuf *mbuf,
+		uint32_t *ipv4, uint32_t *ipv4_cnt,
+		uint8_t ipv6[RTE_FIB6_IPV6_ADDR_SIZE],
+		uint32_t *ipv6_cnt, uint8_t *ip_type)
+{
+	struct rte_ether_hdr *eth_hdr;
+	struct rte_ipv4_hdr *ipv4_hdr;
+	struct rte_ipv6_hdr *ipv6_hdr;
+
+	eth_hdr = rte_pktmbuf_mtod(mbuf, struct rte_ether_hdr *);
+	/* IPv4 */
+	if (mbuf->packet_type & RTE_PTYPE_L3_IPV4) {
+		ipv4_hdr = (struct rte_ipv4_hdr *)(eth_hdr + 1);
+		*ipv4 = rte_be_to_cpu_32(ipv4_hdr->dst_addr);
+		/* Store type of packet in type_arr (IPv4=1, IPv6=0). */
+		*ip_type = 1;
+		(*ipv4_cnt)++;
+	}
+	/* IPv6 */
+	else {
+		ipv6_hdr = (struct rte_ipv6_hdr *)(eth_hdr + 1);
+		rte_mov16(ipv6, (const uint8_t *)ipv6_hdr->dst_addr);
+		*ip_type = 0;
+		(*ipv6_cnt)++;
+	}
+}
+
+/*
+ * If the machine does not have SSE, NEON or PPC 64 then the packets
+ * are sent one at a time using send_single_packet()
+ */
+#if !defined FIB_SEND_MULTI
+static inline void
+fib_send_single(int nb_tx, struct lcore_conf *qconf,
+		struct rte_mbuf **pkts_burst, uint16_t hops[nb_tx])
+{
+	int32_t j;
+	struct rte_ether_hdr *eth_hdr;
+
+	for (j = 0; j < nb_tx; j++) {
+		/* Run rfc1812 if packet is ipv4 and checks enabled. */
+#if defined DO_RFC_1812_CHECKS
+		rfc1812_process((struct rte_ipv4_hdr *)(rte_pktmbuf_mtod(
+				pkts_burst[j], struct rte_ether_hdr *) + 1),
+				&hops[j], pkts_burst[j]->packet_type);
+#endif
+
+		/* Set MAC addresses. */
+		eth_hdr = rte_pktmbuf_mtod(pkts_burst[j],
+				struct rte_ether_hdr *);
+		*(uint64_t *)&eth_hdr->d_addr = dest_eth_addr[hops[j]];
+		rte_ether_addr_copy(&ports_eth_addr[hops[j]],
+				&eth_hdr->s_addr);
+
+		/* Send single packet. */
+		send_single_packet(qconf, pkts_burst[j], hops[j]);
+	}
+}
+#endif
+
+/* Bulk parse, fib lookup and send. */
+static inline void
+fib_send_packets(int nb_rx, struct rte_mbuf **pkts_burst,
+		uint16_t portid, struct lcore_conf *qconf)
+{
+	uint32_t ipv4_arr[nb_rx];
+	uint8_t ipv6_arr[nb_rx][RTE_FIB6_IPV6_ADDR_SIZE];
+	uint16_t hops[nb_rx];
+	uint64_t hopsv4[nb_rx], hopsv6[nb_rx];
+	uint8_t type_arr[nb_rx];
+	uint32_t ipv4_cnt = 0, ipv6_cnt = 0;
+	uint32_t ipv4_arr_assem = 0, ipv6_arr_assem = 0;
+	uint16_t nh;
+	int32_t i;
+
+	/* Prefetch first packets. */
+	for (i = 0; i < FIB_PREFETCH_OFFSET && i < nb_rx; i++)
+		rte_prefetch0(rte_pktmbuf_mtod(pkts_burst[i], void *));
+
+	/* Parse packet info and prefetch. */
+	for (i = 0; i < (nb_rx - FIB_PREFETCH_OFFSET); i++) {
+		/* Prefetch packet. */
+		rte_prefetch0(rte_pktmbuf_mtod(pkts_burst[
+				i + FIB_PREFETCH_OFFSET], void *));
+		fib_parse_packet(pkts_burst[i],
+				&ipv4_arr[ipv4_cnt], &ipv4_cnt,
+				ipv6_arr[ipv6_cnt], &ipv6_cnt,
+				&type_arr[i]);
+	}
+
+	/* Parse remaining packet info. */
+	for (; i < nb_rx; i++)
+		fib_parse_packet(pkts_burst[i],
+				&ipv4_arr[ipv4_cnt], &ipv4_cnt,
+				ipv6_arr[ipv6_cnt], &ipv6_cnt,
+				&type_arr[i]);
+
+	/* Lookup IPv4 hops if IPv4 packets are present. */
+	if (likely(ipv4_cnt > 0))
+		rte_fib_lookup_bulk(qconf->ipv4_lookup_struct,
+				ipv4_arr, hopsv4, ipv4_cnt);
+
+	/* Lookup IPv6 hops if IPv6 packets are present. */
+	if (ipv6_cnt > 0)
+		rte_fib6_lookup_bulk(qconf->ipv6_lookup_struct,
+				ipv6_arr, hopsv6, ipv6_cnt);
+
+	/* Add IPv4 and IPv6 hops to one array depending on type. */
+	for (i = 0; i < nb_rx; i++) {
+		if (type_arr[i])
+			nh = (uint16_t)hopsv4[ipv4_arr_assem++];
+		else
+			nh = (uint16_t)hopsv6[ipv6_arr_assem++];
+		hops[i] = nh != FIB_DEFAULT_HOP ? nh : portid;
+	}
+
+#if defined FIB_SEND_MULTI
+	send_packets_multi(qconf, pkts_burst, hops, nb_rx);
+#else
+	fib_send_single(nb_rx, qconf, pkts_burst, hops);
+#endif
+}
+
 /* Main fib processing loop. */
 int
 fib_main_loop(__rte_unused void *dummy)
 {
+	struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
+	unsigned int lcore_id;
+	uint64_t prev_tsc, diff_tsc, cur_tsc;
+	int i, nb_rx;
+	uint16_t portid;
+	uint8_t queueid;
+	struct lcore_conf *qconf;
+	const uint64_t drain_tsc = (rte_get_tsc_hz() + US_PER_S - 1) /
+			US_PER_S * BURST_TX_DRAIN_US;
+
+	prev_tsc = 0;
+
+	lcore_id = rte_lcore_id();
+	qconf = &lcore_conf[lcore_id];
+
+	if (qconf->n_rx_queue == 0) {
+		RTE_LOG(INFO, L3FWD, "lcore %u has nothing to do\n", lcore_id);
+		return 0;
+	}
+
+	RTE_LOG(INFO, L3FWD, "entering main loop on lcore %u\n", lcore_id);
+
+	for (i = 0; i < qconf->n_rx_queue; i++) {
+
+		portid = qconf->rx_queue_list[i].port_id;
+		queueid = qconf->rx_queue_list[i].queue_id;
+		RTE_LOG(INFO, L3FWD,
+				" -- lcoreid=%u portid=%u rxqueueid=%hhu\n",
+				lcore_id, portid, queueid);
+	}
+
+	while (!force_quit) {
+
+		cur_tsc = rte_rdtsc();
+
+		/* TX burst queue drain. */
+		diff_tsc = cur_tsc - prev_tsc;
+		if (unlikely(diff_tsc > drain_tsc)) {
+
+			for (i = 0; i < qconf->n_tx_port; ++i) {
+				portid = qconf->tx_port_id[i];
+				if (qconf->tx_mbufs[portid].len == 0)
+					continue;
+				send_burst(qconf,
+					qconf->tx_mbufs[portid].len,
+					portid);
+				qconf->tx_mbufs[portid].len = 0;
+			}
+
+			prev_tsc = cur_tsc;
+		}
+
+		/* Read packet from RX queues. */
+		for (i = 0; i < qconf->n_rx_queue; ++i) {
+			portid = qconf->rx_queue_list[i].port_id;
+			queueid = qconf->rx_queue_list[i].queue_id;
+			nb_rx = rte_eth_rx_burst(portid, queueid, pkts_burst,
+					MAX_PKT_BURST);
+			if (nb_rx == 0)
+				continue;
+
+			/* Use fib to lookup port IDs and transmit them. */
+			fib_send_packets(nb_rx, pkts_burst,	portid, qconf);
+		}
+	}
+
 	return 0;
 }
 
+/* One eventdev loop for single and burst using fib. */
+static __rte_always_inline void
+fib_event_loop(struct l3fwd_event_resources *evt_rsrc,
+		const uint8_t flags)
+{
+	const int event_p_id = l3fwd_get_free_event_port(evt_rsrc);
+	const uint8_t tx_q_id = evt_rsrc->evq.event_q_id[
+			evt_rsrc->evq.nb_queues - 1];
+	const uint8_t event_d_id = evt_rsrc->event_d_id;
+	const uint16_t deq_len = evt_rsrc->deq_depth;
+	struct rte_event events[MAX_PKT_BURST];
+	struct lcore_conf *lconf;
+	unsigned int lcore_id;
+	int nb_enq, nb_deq, i;
+
+	uint32_t ipv4_arr[MAX_PKT_BURST];
+	uint8_t ipv6_arr[MAX_PKT_BURST][RTE_FIB6_IPV6_ADDR_SIZE];
+	uint64_t hopsv4[MAX_PKT_BURST], hopsv6[MAX_PKT_BURST];
+	uint16_t nh;
+	uint8_t type_arr[MAX_PKT_BURST];
+	uint32_t ipv4_cnt, ipv6_cnt;
+	uint32_t ipv4_arr_assem, ipv6_arr_assem;
+
+	if (event_p_id < 0)
+		return;
+
+	lcore_id = rte_lcore_id();
+
+	lconf = &lcore_conf[lcore_id];
+
+	RTE_LOG(INFO, L3FWD, "entering %s on lcore %u\n", __func__, lcore_id);
+
+	while (!force_quit) {
+		/* Read events from RX queues. */
+		nb_deq = rte_event_dequeue_burst(event_d_id, event_p_id,
+				events, deq_len, 0);
+		if (nb_deq == 0) {
+			rte_pause();
+			continue;
+		}
+
+		/* Reset counters. */
+		ipv4_cnt = 0;
+		ipv6_cnt = 0;
+		ipv4_arr_assem = 0;
+		ipv6_arr_assem = 0;
+
+		/* Prefetch first packets. */
+		for (i = 0; i < FIB_PREFETCH_OFFSET && i < nb_deq; i++)
+			rte_prefetch0(rte_pktmbuf_mtod(events[i].mbuf, void *));
+
+		/* Parse packet info and prefetch. */
+		for (i = 0; i < (nb_deq - FIB_PREFETCH_OFFSET); i++) {
+			if (flags & L3FWD_EVENT_TX_ENQ) {
+				events[i].queue_id = tx_q_id;
+				events[i].op = RTE_EVENT_OP_FORWARD;
+			}
+
+			if (flags & L3FWD_EVENT_TX_DIRECT)
+				rte_event_eth_tx_adapter_txq_set(events[i].mbuf,
+						0);
+
+			/* Prefetch packet. */
+			rte_prefetch0(rte_pktmbuf_mtod(events[
+					i + FIB_PREFETCH_OFFSET].mbuf,
+					void *));
+
+			fib_parse_packet(events[i].mbuf,
+					&ipv4_arr[ipv4_cnt], &ipv4_cnt,
+					ipv6_arr[ipv6_cnt], &ipv6_cnt,
+					&type_arr[i]);
+		}
+
+		/* Parse remaining packet info. */
+		for (; i < nb_deq; i++) {
+			if (flags & L3FWD_EVENT_TX_ENQ) {
+				events[i].queue_id = tx_q_id;
+				events[i].op = RTE_EVENT_OP_FORWARD;
+			}
+
+			if (flags & L3FWD_EVENT_TX_DIRECT)
+				rte_event_eth_tx_adapter_txq_set(events[i].mbuf,
+						0);
+
+			fib_parse_packet(events[i].mbuf,
+					&ipv4_arr[ipv4_cnt], &ipv4_cnt,
+					ipv6_arr[ipv6_cnt], &ipv6_cnt,
+					&type_arr[i]);
+		}
+
+		/* Lookup IPv4 hops if IPv4 packets are present. */
+		if (likely(ipv4_cnt > 0))
+			rte_fib_lookup_bulk(lconf->ipv4_lookup_struct,
+					ipv4_arr, hopsv4, ipv4_cnt);
+
+		/* Lookup IPv6 hops if IPv6 packets are present. */
+		if (ipv6_cnt > 0)
+			rte_fib6_lookup_bulk(lconf->ipv6_lookup_struct,
+					ipv6_arr, hopsv6, ipv6_cnt);
+
+		/* Assign ports looked up in fib depending on IPv4 or IPv6 */
+		for (i = 0; i < nb_deq; i++) {
+			if (type_arr[i])
+				nh = (uint16_t)hopsv4[ipv4_arr_assem++];
+			else
+				nh = (uint16_t)hopsv6[ipv6_arr_assem++];
+			if (nh != FIB_DEFAULT_HOP)
+				events[i].mbuf->port = nh;
+		}
+
+		if (flags & L3FWD_EVENT_TX_ENQ) {
+			nb_enq = rte_event_enqueue_burst(event_d_id, event_p_id,
+					events, nb_deq);
+			while (nb_enq < nb_deq && !force_quit)
+				nb_enq += rte_event_enqueue_burst(event_d_id,
+						event_p_id, events + nb_enq,
+						nb_deq - nb_enq);
+		}
+
+		if (flags & L3FWD_EVENT_TX_DIRECT) {
+			nb_enq = rte_event_eth_tx_adapter_enqueue(event_d_id,
+					event_p_id, events, nb_deq, 0);
+			while (nb_enq < nb_deq && !force_quit)
+				nb_enq += rte_event_eth_tx_adapter_enqueue(
+						event_d_id, event_p_id,
+						events + nb_enq,
+						nb_deq - nb_enq, 0);
+		}
+	}
+}
+
 int __rte_noinline
 fib_event_main_loop_tx_d(__rte_unused void *dummy)
 {
+	struct l3fwd_event_resources *evt_rsrc =
+			l3fwd_get_eventdev_rsrc();
+
+	fib_event_loop(evt_rsrc, L3FWD_EVENT_TX_DIRECT);
 	return 0;
 }
 
 int __rte_noinline
 fib_event_main_loop_tx_d_burst(__rte_unused void *dummy)
 {
+	struct l3fwd_event_resources *evt_rsrc =
+			l3fwd_get_eventdev_rsrc();
+
+	fib_event_loop(evt_rsrc, L3FWD_EVENT_TX_DIRECT);
 	return 0;
 }
 
 int __rte_noinline
 fib_event_main_loop_tx_q(__rte_unused void *dummy)
 {
+	struct l3fwd_event_resources *evt_rsrc =
+			l3fwd_get_eventdev_rsrc();
+
+	fib_event_loop(evt_rsrc, L3FWD_EVENT_TX_ENQ);
 	return 0;
 }
 
 int __rte_noinline
 fib_event_main_loop_tx_q_burst(__rte_unused void *dummy)
 {
+	struct l3fwd_event_resources *evt_rsrc =
+			l3fwd_get_eventdev_rsrc();
+
+	fib_event_loop(evt_rsrc, L3FWD_EVENT_TX_ENQ);
 	return 0;
 }
 
 /* Function to setup fib. */
 void
-setup_fib(__rte_unused const int socketid)
-{}
+setup_fib(const int socketid)
+{
+	struct rte_fib6_conf config;
+	struct rte_fib_conf config_ipv4;
+	unsigned int i;
+	int ret;
+	char s[64];
+	char abuf[INET6_ADDRSTRLEN];
+
+	/* Create the fib IPv4 table. */
+	config_ipv4.type = RTE_FIB_DIR24_8;
+	config_ipv4.max_routes = (1 << 16);
+	config_ipv4.default_nh = FIB_DEFAULT_HOP;
+	config_ipv4.dir24_8.nh_sz = RTE_FIB_DIR24_8_4B;
+	config_ipv4.dir24_8.num_tbl8 = (1 << 15);
+	snprintf(s, sizeof(s), "IPV4_L3FWD_FIB_%d", socketid);
+	ipv4_l3fwd_fib_lookup_struct[socketid] =
+			rte_fib_create(s, socketid, &config_ipv4);
+	if (ipv4_l3fwd_fib_lookup_struct[socketid] == NULL)
+		rte_exit(EXIT_FAILURE,
+			"Unable to create the l3fwd FIB table on socket %d\n",
+			socketid);
+
+	/* Populate the fib ipv4 table. */
+	for (i = 0; i < RTE_DIM(ipv4_l3fwd_route_array); i++) {
+		struct in_addr in;
+
+		/* Skip unused ports. */
+		if ((1 << ipv4_l3fwd_route_array[i].if_out &
+				enabled_port_mask) == 0)
+			continue;
+
+		ret = rte_fib_add(ipv4_l3fwd_fib_lookup_struct[socketid],
+			ipv4_l3fwd_route_array[i].ip,
+			ipv4_l3fwd_route_array[i].depth,
+			ipv4_l3fwd_route_array[i].if_out);
+
+		if (ret < 0) {
+			rte_exit(EXIT_FAILURE,
+					"Unable to add entry %u to the l3fwd FIB table on socket %d\n",
+					i, socketid);
+		}
+
+		in.s_addr = htonl(ipv4_l3fwd_route_array[i].ip);
+		if (inet_ntop(AF_INET, &in, abuf, sizeof(abuf)) != NULL) {
+			printf("FIB: Adding route %s / %d (%d)\n",
+				abuf,
+				ipv4_l3fwd_route_array[i].depth,
+				ipv4_l3fwd_route_array[i].if_out);
+		} else {
+			printf("FIB: IPv4 route added to port %d\n",
+				ipv4_l3fwd_route_array[i].if_out);
+		}
+	}
+
+	/* Create the fib IPv6 table. */
+	snprintf(s, sizeof(s), "IPV6_L3FWD_FIB_%d", socketid);
+
+	config.type = RTE_FIB6_TRIE;
+	config.max_routes = (1 << 16) - 1;
+	config.default_nh = FIB_DEFAULT_HOP;
+	config.trie.nh_sz = RTE_FIB6_TRIE_4B;
+	config.trie.num_tbl8 = (1 << 15);
+	ipv6_l3fwd_fib_lookup_struct[socketid] = rte_fib6_create(s, socketid,
+			&config);
+	if (ipv6_l3fwd_fib_lookup_struct[socketid] == NULL)
+		rte_exit(EXIT_FAILURE,
+				"Unable to create the l3fwd FIB table on socket %d\n",
+				socketid);
+
+	/* Populate the fib IPv6 table. */
+	for (i = 0; i < RTE_DIM(ipv6_l3fwd_route_array); i++) {
+
+		/* Skip unused ports. */
+		if ((1 << ipv6_l3fwd_route_array[i].if_out &
+				enabled_port_mask) == 0)
+			continue;
+
+		ret = rte_fib6_add(ipv6_l3fwd_fib_lookup_struct[socketid],
+			ipv6_l3fwd_route_array[i].ip,
+			ipv6_l3fwd_route_array[i].depth,
+			ipv6_l3fwd_route_array[i].if_out);
+
+		if (ret < 0) {
+			rte_exit(EXIT_FAILURE,
+					"Unable to add entry %u to the l3fwd FIB table on socket %d\n",
+					i, socketid);
+		}
+
+		if (inet_ntop(AF_INET6, ipv6_l3fwd_route_array[i].ip,
+				abuf, sizeof(abuf)) != NULL) {
+			printf("FIB: Adding route %s / %d (%d)\n",
+				abuf,
+				ipv6_l3fwd_route_array[i].depth,
+				ipv6_l3fwd_route_array[i].if_out);
+		} else {
+			printf("FIB: IPv6 route added to port %d\n",
+				ipv6_l3fwd_route_array[i].if_out);
+		}
+	}
+}
 
 /* Return ipv4 fib lookup struct. */
 void *
-fib_get_ipv4_l3fwd_lookup_struct(__rte_unused const int socketid)
+fib_get_ipv4_l3fwd_lookup_struct(const int socketid)
 {
-	return 0;
+	return ipv4_l3fwd_fib_lookup_struct[socketid];
 }
 
 /* Return ipv6 fib lookup struct. */
 void *
-fib_get_ipv6_l3fwd_lookup_struct(__rte_unused const int socketid)
+fib_get_ipv6_l3fwd_lookup_struct(const int socketid)
 {
-	return 0;
+	return ipv6_l3fwd_fib_lookup_struct[socketid];
 }
-- 
2.25.1