[dpdk-dev] [PATCH v2 2/3] app/testpmd: improve MAC swap performance for x86

Iremonger, Bernard bernard.iremonger at intel.com
Fri Dec 14 12:21:51 CET 2018


Hi Qi,

> -----Original Message-----
> From: Zhang, Qi Z
> Sent: Tuesday, December 11, 2018 5:55 AM
> To: Yigit, Ferruh <ferruh.yigit at intel.com>; Richardson, Bruce
> <bruce.richardson at intel.com>; Wiles, Keith <keith.wiles at intel.com>;
> Ananyev, Konstantin <konstantin.ananyev at intel.com>
> Cc: dev at dpdk.org; Lu, Wenzhuo <wenzhuo.lu at intel.com>; Iremonger,
> Bernard <bernard.iremonger at intel.com>; Zhang, Qi Z
> <qi.z.zhang at intel.com>
> Subject: [PATCH v2 2/3] app/testpmd: improve MAC swap performance for
> x86
> 
> 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 at intel.com>
> ---
>  app/test-pmd/macswap.c        |  4 ++++
>  app/test-pmd/macswap_common.h |  1 -
>  app/test-pmd/macswap_sse.h    | 45
> +++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 49 insertions(+), 1 deletion(-)  create mode 100644 app/test-
> pmd/macswap_sse.h
> 
> diff --git a/app/test-pmd/macswap.c b/app/test-pmd/macswap.c index
> 849194fe2..cbb41b728 100644
> --- a/app/test-pmd/macswap.c
> +++ b/app/test-pmd/macswap.c
> @@ -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 diff --git a/app/test-pmd/macswap_common.h b/app/test-
> pmd/macswap_common.h index ab0a5b5ef..8c5518596 100644
> --- a/app/test-pmd/macswap_common.h
> +++ b/app/test-pmd/macswap_common.h
> @@ -44,4 +44,3 @@ mbuf_field_set(struct rte_mbuf *mb, uint64_t ol_flags)
> }
> 
>  #endif /* _BPF_CMD_H_ */
> -
> diff --git a/app/test-pmd/macswap_sse.h b/app/test-pmd/macswap_sse.h
> new file mode 100644 index 000000000..79f4f9a7c
> --- /dev/null
> +++ b/app/test-pmd/macswap_sse.h
> @@ -0,0 +1,45 @@
> +/* SPDX-License-Identifier: BSD-3-Clause
> + * Copyright(c) 2018 Intel Corporation
> + */
> +
> +#ifndef _L2FWD_SSE_H_
> +#define _L2FWD_SSE_H_

_L2FWD_SSE_H_  should be replaced by _MACSWAP_SSE_H_  in the lines above.

> +
> +#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;

Some comments explaining the parameters to _mm_set_epi8() would be useful.

> +	__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 /* _BPF_CMD_H_ */

_BPF_CMD_H should be replaced by _MACSWAP_SSE_H_ in the line above.

> +
> --
> 2.13.6

A white space error is reported when applying this patch

Applying: app/testpmd: improve MAC swap performance for x86
.git/rebase-apply/patch:83: new blank line at EOF.

Regards,

Bernard.




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