xref: /dpdk/examples/common/altivec/port_group.h (revision 927cb43fe90f95eb696e890682749749d8149bb2)

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2016 Intel Corporation.
 * Copyright(c) 2017 IBM Corporation.
 * Copyright(C) 2022 Marvell.
 */

#ifndef PORT_GROUP_H
#define PORT_GROUP_H

#include "pkt_group.h"

/*
 * Group consecutive packets with the same destination port in bursts of 4.
 * Suppose we have array of destination ports:
 * dst_port[] = {a, b, c, d,, e, ... }
 * dp1 should contain: <a, b, c, d>, dp2: <b, c, d, e>.
 * We doing 4 comparisons at once and the result is 4 bit mask.
 * This mask is used as an index into prebuild array of pnum values.
 */
static inline uint16_t *
port_groupx4(uint16_t pn[FWDSTEP + 1], uint16_t *lp,
	     __vector unsigned short dp1,
	     __vector unsigned short dp2)
{
	union {
		uint16_t u16[FWDSTEP + 1];
		uint64_t u64;
	} *pnum = (void *)pn;
	__vector unsigned long long result;
	const __vector unsigned int perm_mask = {0x00204060, 0x80808080,
						 0x80808080, 0x80808080};
	int32_t v;

	dp1 = (__vector unsigned short)vec_cmpeq(dp1, dp2);
	dp1 = vec_mergeh(dp1, dp1);
	result = (__vector unsigned long long)vec_vbpermq(
		(__vector unsigned char)dp1, (__vector unsigned char)perm_mask);

	v = result[1];
	/* update last port counter. */
	lp[0] += gptbl[v].lpv;

	/* if dest port value has changed. */
	if (v != GRPMSK) {
		pnum->u64 = gptbl[v].pnum;
		pnum->u16[FWDSTEP] = 1;
		lp = pnum->u16 + gptbl[v].idx;
	}

	return lp;
}

#endif /* PORT_GROUP_H */