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app/testpmd: improve MAC swap performance for x86

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The patch optimizes the mac swap operation by taking advantage
of SSE instructions, it only impacts x86 platform.

Signed-off-by: Qi Zhang <qi.z.zhang@intel.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>
Acked-by: Bernard Iremonger <bernard.iremonger@intel.com>
This commit is contained in:
Qi Zhang 2018-12-16 08:58:34 +08:00 committed by Ferruh Yigit
parent a825afdbb9
commit a68b61687a
2 changed files with 53 additions and 0 deletions
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4
app/test-pmd/macswap.c
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@ -66,7 +66,11 @@
#include <rte_flow.h>
#include "testpmd.h"
#ifdef RTE_ARCH_X86
#include "macswap_sse.h"
#else
#include "macswap.h"
#endif
/*
* MAC swap forwarding mode: Swap the source and the destination Ethernet

49
app/test-pmd/macswap_sse.h Normal file
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@ -0,0 +1,49 @@
/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2018 Intel Corporation
*/
#ifndef _MACSWAP_SSE_H_
#define _MACSWAP_SSE_H_
#include "macswap_common.h"
static inline void
do_macswap(struct rte_mbuf *pkts[], uint16_t nb,
struct rte_port *txp)
{
struct ether_hdr *eth_hdr;
struct rte_mbuf *mb;
uint64_t ol_flags;
int i;
__m128i addr;
/**
* shuffle mask be used to shuffle the 16 bytes.
* byte 0-5 wills be swapped with byte 6-11.
* byte 12-15 will keep unchanged.
*/
__m128i shfl_msk = _mm_set_epi8(15, 14, 13, 12,
5, 4, 3, 2,
1, 0, 11, 10,
9, 8, 7, 6);
ol_flags = ol_flags_init(txp->dev_conf.txmode.offloads);
vlan_qinq_set(pkts, nb, ol_flags,
txp->tx_vlan_id, txp->tx_vlan_id_outer);
for (i = 0; i < nb; i++) {
if (likely(i < nb - 1))
rte_prefetch0(rte_pktmbuf_mtod(pkts[i+1], void *));
mb = pkts[i];
eth_hdr = rte_pktmbuf_mtod(mb, struct ether_hdr *);
/* Swap dest and src mac addresses. */
addr = _mm_loadu_si128((__m128i *)eth_hdr);
addr = _mm_shuffle_epi8(addr, shfl_msk);
_mm_storeu_si128((__m128i *)eth_hdr, addr);
mbuf_field_set(mb, ol_flags);
}
}
#endif /* _MACSWAP_SSE_H_ */