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path: root/examples/l3fwd/l3fwd_lpm_altivec.h
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/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2010-2016 Intel Corporation.
 * Copyright(c) 2017 IBM Corporation.
 * All rights reserved.
 */

#ifndef __L3FWD_LPM_ALTIVEC_H__
#define __L3FWD_LPM_ALTIVEC_H__

#include "l3fwd_altivec.h"

/*
 * Read packet_type and destination IPV4 addresses from 4 mbufs.
 */
static inline void
processx4_step1(struct rte_mbuf *pkt[FWDSTEP],
		vector unsigned int *dip,
		uint32_t *ipv4_flag)
{
	struct ipv4_hdr *ipv4_hdr;
	struct ether_hdr *eth_hdr;
	uint32_t x0, x1, x2, x3;

	eth_hdr = rte_pktmbuf_mtod(pkt[0], struct ether_hdr *);
	ipv4_hdr = (struct ipv4_hdr *)(eth_hdr + 1);
	x0 = ipv4_hdr->dst_addr;
	ipv4_flag[0] = pkt[0]->packet_type & RTE_PTYPE_L3_IPV4;

	rte_compiler_barrier();
	eth_hdr = rte_pktmbuf_mtod(pkt[1], struct ether_hdr *);
	ipv4_hdr = (struct ipv4_hdr *)(eth_hdr + 1);
	x1 = ipv4_hdr->dst_addr;
	ipv4_flag[0] &= pkt[1]->packet_type;

	rte_compiler_barrier();
	eth_hdr = rte_pktmbuf_mtod(pkt[2], struct ether_hdr *);
	ipv4_hdr = (struct ipv4_hdr *)(eth_hdr + 1);
	x2 = ipv4_hdr->dst_addr;
	ipv4_flag[0] &= pkt[2]->packet_type;

	rte_compiler_barrier();
	eth_hdr = rte_pktmbuf_mtod(pkt[3], struct ether_hdr *);
	ipv4_hdr = (struct ipv4_hdr *)(eth_hdr + 1);
	x3 = ipv4_hdr->dst_addr;
	ipv4_flag[0] &= pkt[3]->packet_type;

	rte_compiler_barrier();
	dip[0] = (vector unsigned int){x0, x1, x2, x3};
}

/*
 * Lookup into LPM for destination port.
 * If lookup fails, use incoming port (portid) as destination port.
 */
static inline void
processx4_step2(const struct lcore_conf *qconf,
		vector unsigned int dip,
		uint32_t ipv4_flag,
		uint8_t portid,
		struct rte_mbuf *pkt[FWDSTEP],
		uint16_t dprt[FWDSTEP])
{
	rte_xmm_t dst;
	const vector unsigned char bswap_mask = (vector unsigned char){
							3, 2, 1, 0,
							7, 6, 5, 4,
							11, 10, 9, 8,
							15, 14, 13, 12};

	/* Byte swap 4 IPV4 addresses. */
	dip = (vector unsigned int)vec_perm(*(vector unsigned char *)&dip,
					(vector unsigned char){}, bswap_mask);

	/* if all 4 packets are IPV4. */
	if (likely(ipv4_flag)) {
		rte_lpm_lookupx4(qconf->ipv4_lookup_struct, (xmm_t)dip,
			(uint32_t *)&dst, portid);
		/* get rid of unused upper 16 bit for each dport. */
		dst.x = (xmm_t)vec_packs(dst.x, dst.x);
		*(uint64_t *)dprt = dst.u64[0];
	} else {
		dst.x = (xmm_t)dip;
		dprt[0] = lpm_get_dst_port_with_ipv4(qconf, pkt[0],
							dst.u32[0], portid);
		dprt[1] = lpm_get_dst_port_with_ipv4(qconf, pkt[1],
							dst.u32[1], portid);
		dprt[2] = lpm_get_dst_port_with_ipv4(qconf, pkt[2],
							dst.u32[2], portid);
		dprt[3] = lpm_get_dst_port_with_ipv4(qconf, pkt[3],
							dst.u32[3], portid);
	}
}

/*
 * Buffer optimized handling of packets, invoked
 * from main_loop.
 */
static inline void
l3fwd_lpm_send_packets(int nb_rx, struct rte_mbuf **pkts_burst,
			uint8_t portid, struct lcore_conf *qconf)
{
	int32_t j;
	uint16_t dst_port[MAX_PKT_BURST];
	vector unsigned int dip[MAX_PKT_BURST / FWDSTEP];
	uint32_t ipv4_flag[MAX_PKT_BURST / FWDSTEP];
	const int32_t k = RTE_ALIGN_FLOOR(nb_rx, FWDSTEP);

	for (j = 0; j != k; j += FWDSTEP)
		processx4_step1(&pkts_burst[j], &dip[j / FWDSTEP],
				&ipv4_flag[j / FWDSTEP]);

	for (j = 0; j != k; j += FWDSTEP)
		processx4_step2(qconf, dip[j / FWDSTEP],
				ipv4_flag[j / FWDSTEP],
				portid, &pkts_burst[j], &dst_port[j]);

	/* Classify last up to 3 packets one by one */
	switch (nb_rx % FWDSTEP) {
	case 3:
		dst_port[j] = lpm_get_dst_port(qconf, pkts_burst[j], portid);
		j++;
		/* fall-through */
	case 2:
		dst_port[j] = lpm_get_dst_port(qconf, pkts_burst[j], portid);
		j++;
		/* fall-through */
	case 1:
		dst_port[j] = lpm_get_dst_port(qconf, pkts_burst[j], portid);
		j++;
		/* fall-through */
	}

	send_packets_multi(qconf, pkts_burst, dst_port, nb_rx);
}

#endif /* __L3FWD_LPM_ALTIVEC_H__ */