[dpdk-dev] [PATCH v2] app/testpmd: optimized MAC swap by using neon intrinsics

[dpdk-dev] [PATCH v2] app/testpmd: optimized MAC swap by using neon intrinsics

[Ruifeng Wang]

Improved MAC swap performance for ARM platform.
The improvement was achieved by using neon intrinsics
to save CPU cycles and doing swap for four packets
at a time.
The optimization had 15% - 20% throughput boost
in testpmd MAC swap mode.

Signed-off-by: Ruifeng Wang <ruifeng.wang@arm.com>
Reviewed-by: Gavin Hu <gavin.hu@arm.com>
Reviewed-by: Phil Yang <phil.yang@arm.com>
Acked-by: Jerin Jacob <jerinj@marvell.com>
---
v2:
* Defined idx_map as const.
* Added file header line to indicate derivation from macswap_sse.h.

 app/test-pmd/macswap.c      |  4 +-
 app/test-pmd/macswap_neon.h | 97 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 100 insertions(+), 1 deletion(-)
 create mode 100644 app/test-pmd/macswap_neon.h

diff --git a/app/test-pmd/macswap.c b/app/test-pmd/macswap.c
index cbb41b7..71af916 100644
--- a/app/test-pmd/macswap.c
+++ b/app/test-pmd/macswap.c
@@ -66,8 +66,10 @@
 #include <rte_flow.h>
 
 #include "testpmd.h"
-#ifdef RTE_ARCH_X86
+#if defined(RTE_ARCH_X86)
 #include "macswap_sse.h"
+#elif defined(RTE_MACHINE_CPUFLAG_NEON)
+#include "macswap_neon.h"
 #else
 #include "macswap.h"
 #endif
diff --git a/app/test-pmd/macswap_neon.h b/app/test-pmd/macswap_neon.h
new file mode 100644
index 0000000..bdf416a
--- /dev/null
+++ b/app/test-pmd/macswap_neon.h
@@ -0,0 +1,97 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2019 Arm Limited
+ *
+ * Copyright(c) 2019 Intel Corporation
+ *
+ * Derived do_macswap implementation from app/test-pmd/macswap_sse.h
+ */
+
+#ifndef _MACSWAP_NEON_H_
+#define _MACSWAP_NEON_H_
+
+#include "macswap_common.h"
+#include "rte_vect.h"
+
+static inline void
+do_macswap(struct rte_mbuf *pkts[], uint16_t nb,
+		struct rte_port *txp)
+{
+	struct ether_hdr *eth_hdr[4];
+	struct rte_mbuf *mb[4];
+	uint64_t ol_flags;
+	int i;
+	int r;
+	uint8x16_t v0, v1, v2, v3;
+	/**
+	 * Index map be used to shuffle the 16 bytes.
+	 * byte 0-5 will be swapped with byte 6-11.
+	 * byte 12-15 will keep unchanged.
+	 */
+	const uint8x16_t idx_map = {6, 7, 8, 9, 10, 11, 0, 1, 2, 3, 4, 5,
+				12, 13, 14, 15};
+
+	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);
+
+	i = 0;
+	r = nb;
+
+	while (r >= 4) {
+		if (r >= 8) {
+			rte_prefetch0(rte_pktmbuf_mtod(pkts[i + 4], void *));
+			rte_prefetch0(rte_pktmbuf_mtod(pkts[i + 5], void *));
+			rte_prefetch0(rte_pktmbuf_mtod(pkts[i + 6], void *));
+			rte_prefetch0(rte_pktmbuf_mtod(pkts[i + 7], void *));
+		}
+
+		mb[0] = pkts[i++];
+		eth_hdr[0] = rte_pktmbuf_mtod(mb[0], struct ether_hdr *);
+
+		mb[1] = pkts[i++];
+		eth_hdr[1] = rte_pktmbuf_mtod(mb[1], struct ether_hdr *);
+
+		mb[2] = pkts[i++];
+		eth_hdr[2] = rte_pktmbuf_mtod(mb[2], struct ether_hdr *);
+
+		mb[3] = pkts[i++];
+		eth_hdr[3] = rte_pktmbuf_mtod(mb[3], struct ether_hdr *);
+
+		v0 = vld1q_u8((uint8_t const *)eth_hdr[0]);
+		v1 = vld1q_u8((uint8_t const *)eth_hdr[1]);
+		v2 = vld1q_u8((uint8_t const *)eth_hdr[2]);
+		v3 = vld1q_u8((uint8_t const *)eth_hdr[3]);
+
+		v0 = vqtbl1q_u8(v0, idx_map);
+		v1 = vqtbl1q_u8(v1, idx_map);
+		v2 = vqtbl1q_u8(v2, idx_map);
+		v3 = vqtbl1q_u8(v3, idx_map);
+
+		vst1q_u8((uint8_t *)eth_hdr[0], v0);
+		vst1q_u8((uint8_t *)eth_hdr[1], v1);
+		vst1q_u8((uint8_t *)eth_hdr[2], v2);
+		vst1q_u8((uint8_t *)eth_hdr[3], v3);
+
+		mbuf_field_set(mb[0], ol_flags);
+		mbuf_field_set(mb[1], ol_flags);
+		mbuf_field_set(mb[2], ol_flags);
+		mbuf_field_set(mb[3], ol_flags);
+		r -= 4;
+	}
+
+	for ( ; i < nb; i++) {
+		if (i < nb - 1)
+			rte_prefetch0(rte_pktmbuf_mtod(pkts[i+1], void *));
+		mb[0] = pkts[i];
+		eth_hdr[0] = rte_pktmbuf_mtod(mb[0], struct ether_hdr *);
+
+		/* Swap dest and src mac addresses. */
+		v0 = vld1q_u8((uint8_t const *)eth_hdr[0]);
+		v0 = vqtbl1q_u8(v0, idx_map);
+		vst1q_u8((uint8_t *)eth_hdr[0], v0);
+
+		mbuf_field_set(mb[0], ol_flags);
+	}
+}
+
+#endif /* _MACSWAP_NEON_H_ */
-- 
2.7.4

Re: [dpdk-dev] [PATCH v2] app/testpmd: optimized MAC swap by using neon intrinsics

[Honnappa Nagarahalli]

> Improved MAC swap performance for ARM platform.
> The improvement was achieved by using neon intrinsics to save CPU cycles
> and doing swap for four packets at a time.
> The optimization had 15% - 20% throughput boost in testpmd MAC swap
> mode.
> 
> Signed-off-by: Ruifeng Wang <ruifeng.wang@arm.com>
> Reviewed-by: Gavin Hu <gavin.hu@arm.com>
> Reviewed-by: Phil Yang <phil.yang@arm.com>
> Acked-by: Jerin Jacob <jerinj@marvell.com>
> ---
> v2:
> * Defined idx_map as const.
> * Added file header line to indicate derivation from macswap_sse.h.
> 
>  app/test-pmd/macswap.c      |  4 +-
>  app/test-pmd/macswap_neon.h | 97
> +++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 100 insertions(+), 1 deletion(-)  create mode 100644
> app/test-pmd/macswap_neon.h
> 
> diff --git a/app/test-pmd/macswap.c b/app/test-pmd/macswap.c index
> cbb41b7..71af916 100644
> --- a/app/test-pmd/macswap.c
> +++ b/app/test-pmd/macswap.c
> @@ -66,8 +66,10 @@
>  #include <rte_flow.h>
> 
>  #include "testpmd.h"
> -#ifdef RTE_ARCH_X86
> +#if defined(RTE_ARCH_X86)
>  #include "macswap_sse.h"
> +#elif defined(RTE_MACHINE_CPUFLAG_NEON) #include "macswap_neon.h"
>  #else
>  #include "macswap.h"
>  #endif
> diff --git a/app/test-pmd/macswap_neon.h b/app/test-
> pmd/macswap_neon.h new file mode 100644 index 0000000..bdf416a
> --- /dev/null
> +++ b/app/test-pmd/macswap_neon.h
> @@ -0,0 +1,97 @@
> +/* SPDX-License-Identifier: BSD-3-Clause
> + * Copyright(c) 2019 Arm Limited
> + *
> + * Copyright(c) 2019 Intel Corporation
> + *
> + * Derived do_macswap implementation from app/test-pmd/macswap_sse.h
> +*/
> +
> +#ifndef _MACSWAP_NEON_H_
> +#define _MACSWAP_NEON_H_
> +
> +#include "macswap_common.h"
> +#include "rte_vect.h"
> +
> +static inline void
> +do_macswap(struct rte_mbuf *pkts[], uint16_t nb,
> +		struct rte_port *txp)
> +{
> +	struct ether_hdr *eth_hdr[4];
> +	struct rte_mbuf *mb[4];
> +	uint64_t ol_flags;
> +	int i;
> +	int r;
> +	uint8x16_t v0, v1, v2, v3;
> +	/**
> +	 * Index map be used to shuffle the 16 bytes.
> +	 * byte 0-5 will be swapped with byte 6-11.
> +	 * byte 12-15 will keep unchanged.
> +	 */
> +	const uint8x16_t idx_map = {6, 7, 8, 9, 10, 11, 0, 1, 2, 3, 4, 5,
> +				12, 13, 14, 15};
> +
> +	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);
> +
> +	i = 0;
> +	r = nb;
> +
> +	while (r >= 4) {
> +		if (r >= 8) {
> +			rte_prefetch0(rte_pktmbuf_mtod(pkts[i + 4], void *));
> +			rte_prefetch0(rte_pktmbuf_mtod(pkts[i + 5], void *));
> +			rte_prefetch0(rte_pktmbuf_mtod(pkts[i + 6], void *));
> +			rte_prefetch0(rte_pktmbuf_mtod(pkts[i + 7], void *));
> +		}
> +
> +		mb[0] = pkts[i++];
> +		eth_hdr[0] = rte_pktmbuf_mtod(mb[0], struct ether_hdr *);
> +
> +		mb[1] = pkts[i++];
> +		eth_hdr[1] = rte_pktmbuf_mtod(mb[1], struct ether_hdr *);
> +
> +		mb[2] = pkts[i++];
> +		eth_hdr[2] = rte_pktmbuf_mtod(mb[2], struct ether_hdr *);
> +
> +		mb[3] = pkts[i++];
> +		eth_hdr[3] = rte_pktmbuf_mtod(mb[3], struct ether_hdr *);
> +
> +		v0 = vld1q_u8((uint8_t const *)eth_hdr[0]);
> +		v1 = vld1q_u8((uint8_t const *)eth_hdr[1]);
> +		v2 = vld1q_u8((uint8_t const *)eth_hdr[2]);
> +		v3 = vld1q_u8((uint8_t const *)eth_hdr[3]);
> +
> +		v0 = vqtbl1q_u8(v0, idx_map);
> +		v1 = vqtbl1q_u8(v1, idx_map);
> +		v2 = vqtbl1q_u8(v2, idx_map);
> +		v3 = vqtbl1q_u8(v3, idx_map);
> +
> +		vst1q_u8((uint8_t *)eth_hdr[0], v0);
> +		vst1q_u8((uint8_t *)eth_hdr[1], v1);
> +		vst1q_u8((uint8_t *)eth_hdr[2], v2);
> +		vst1q_u8((uint8_t *)eth_hdr[3], v3);
> +
> +		mbuf_field_set(mb[0], ol_flags);
> +		mbuf_field_set(mb[1], ol_flags);
> +		mbuf_field_set(mb[2], ol_flags);
> +		mbuf_field_set(mb[3], ol_flags);
> +		r -= 4;
> +	}
> +
> +	for ( ; i < nb; i++) {
> +		if (i < nb - 1)
> +			rte_prefetch0(rte_pktmbuf_mtod(pkts[i+1], void *));
> +		mb[0] = pkts[i];
> +		eth_hdr[0] = rte_pktmbuf_mtod(mb[0], struct ether_hdr *);
> +
> +		/* Swap dest and src mac addresses. */
> +		v0 = vld1q_u8((uint8_t const *)eth_hdr[0]);
> +		v0 = vqtbl1q_u8(v0, idx_map);
> +		vst1q_u8((uint8_t *)eth_hdr[0], v0);
> +
> +		mbuf_field_set(mb[0], ol_flags);
> +	}
> +}
> +
> +#endif /* _MACSWAP_NEON_H_ */
> --
> 2.7.4

Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>

Re: [dpdk-dev] [PATCH v2] app/testpmd: optimized MAC swap by using neon intrinsics

[Ferruh Yigit]

On 3/12/2019 1:05 PM, Honnappa Nagarahalli wrote:
>> Improved MAC swap performance for ARM platform.
>> The improvement was achieved by using neon intrinsics to save CPU cycles
>> and doing swap for four packets at a time.
>> The optimization had 15% - 20% throughput boost in testpmd MAC swap
>> mode.
>>
>> Signed-off-by: Ruifeng Wang <ruifeng.wang@arm.com>
>> Reviewed-by: Gavin Hu <gavin.hu@arm.com>
>> Reviewed-by: Phil Yang <phil.yang@arm.com>
>> Acked-by: Jerin Jacob <jerinj@marvell.com>
> 
> Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>

Applied to dpdk-next-net/master, thanks.

What do you think adding a release notes update for this?
If you can send it I can squash to this patch.

Re: [dpdk-dev] [PATCH v2] app/testpmd: optimized MAC swap by using neon intrinsics

[Ferruh Yigit]

On 3/12/2019 1:05 PM, Honnappa Nagarahalli wrote:
>> Improved MAC swap performance for ARM platform.
>> The improvement was achieved by using neon intrinsics to save CPU cycles
>> and doing swap for four packets at a time.
>> The optimization had 15% - 20% throughput boost in testpmd MAC swap
>> mode.
>>
>> Signed-off-by: Ruifeng Wang <ruifeng.wang@arm.com>
>> Reviewed-by: Gavin Hu <gavin.hu@arm.com>
>> Reviewed-by: Phil Yang <phil.yang@arm.com>
>> Acked-by: Jerin Jacob <jerinj@marvell.com>
> 
> Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>

Applied to dpdk-next-net/master, thanks.

What do you think adding a release notes update for this?
If you can send it I can squash to this patch.

[dpdk-dev] [PATCH] release notes: added release notes for macswap change

[Ruifeng Wang]

Updated release notes for the testpmd change which used neon intrinsics
to do MAC swap on ARM platform.

Signed-off-by: Ruifeng Wang <ruifeng.wang@arm.com>
Reviewed-by: Gavin Hu <gavin.hu@arm.com>
---
 doc/guides/rel_notes/release_19_05.rst | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/doc/guides/rel_notes/release_19_05.rst b/doc/guides/rel_notes/release_19_05.rst
index 61a2c73..6f76de3 100644
--- a/doc/guides/rel_notes/release_19_05.rst
+++ b/doc/guides/rel_notes/release_19_05.rst
@@ -91,6 +91,11 @@ New Features
 
   * Added promiscuous mode support.
 
+* **Updated the testpmd application.**
+
+  Improved testpmd application performance on ARM platform. For ``macswap``
+  forwarding mode, NEON intrinsics were used to do swap to save CPU cycles.
+
 
 Removed Items
 -------------
-- 
2.7.4

[dpdk-dev] [PATCH] release notes: added release notes for macswap change

[Ruifeng Wang]

Updated release notes for the testpmd change which used neon intrinsics
to do MAC swap on ARM platform.

Signed-off-by: Ruifeng Wang <ruifeng.wang@arm.com>
Reviewed-by: Gavin Hu <gavin.hu@arm.com>
---
 doc/guides/rel_notes/release_19_05.rst | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/doc/guides/rel_notes/release_19_05.rst b/doc/guides/rel_notes/release_19_05.rst
index 61a2c73..6f76de3 100644
--- a/doc/guides/rel_notes/release_19_05.rst
+++ b/doc/guides/rel_notes/release_19_05.rst
@@ -91,6 +91,11 @@ New Features
 
   * Added promiscuous mode support.
 
+* **Updated the testpmd application.**
+
+  Improved testpmd application performance on ARM platform. For ``macswap``
+  forwarding mode, NEON intrinsics were used to do swap to save CPU cycles.
+
 
 Removed Items
 -------------
-- 
2.7.4

Re: [dpdk-dev] [PATCH v2] app/testpmd: optimized MAC swap by using neon intrinsics

[Ruifeng Wang (Arm Technology China)]

Hi Ferruh,

> -----Original Message-----
> From: Ferruh Yigit <ferruh.yigit@intel.com>
> Sent: 2019年3月16日 2:38
> To: Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>; Ruifeng Wang
> (Arm Technology China) <Ruifeng.Wang@arm.com>; wenzhuo.lu@intel.com;
> jingjing.wu@intel.com; bernard.iremonger@intel.com
> Cc: dev@dpdk.org; jerinj@marvell.com; hemant.agrawal@nxp.com; nd
> <nd@arm.com>
> Subject: Re: [dpdk-dev] [PATCH v2] app/testpmd: optimized MAC swap by
> using neon intrinsics
> 
> On 3/12/2019 1:05 PM, Honnappa Nagarahalli wrote:
> >> Improved MAC swap performance for ARM platform.
> >> The improvement was achieved by using neon intrinsics to save CPU
> >> cycles and doing swap for four packets at a time.
> >> The optimization had 15% - 20% throughput boost in testpmd MAC swap
> >> mode.
> >>
> >> Signed-off-by: Ruifeng Wang <ruifeng.wang@arm.com>
> >> Reviewed-by: Gavin Hu <gavin.hu@arm.com>
> >> Reviewed-by: Phil Yang <phil.yang@arm.com>
> >> Acked-by: Jerin Jacob <jerinj@marvell.com>
> >
> > Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
> 
> Applied to dpdk-next-net/master, thanks.
> 
> What do you think adding a release notes update for this?
> If you can send it I can squash to this patch.

Thanks for your suggestion.
Release notes updated in:
http://patches.dpdk.org/patch/51247/

Regards,
/Ruifeng

Re: [dpdk-dev] [PATCH v2] app/testpmd: optimized MAC swap by using neon intrinsics

[Ruifeng Wang (Arm Technology China)]

Hi Ferruh,

> -----Original Message-----
> From: Ferruh Yigit <ferruh.yigit@intel.com>
> Sent: 2019年3月16日 2:38
> To: Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>; Ruifeng Wang
> (Arm Technology China) <Ruifeng.Wang@arm.com>; wenzhuo.lu@intel.com;
> jingjing.wu@intel.com; bernard.iremonger@intel.com
> Cc: dev@dpdk.org; jerinj@marvell.com; hemant.agrawal@nxp.com; nd
> <nd@arm.com>
> Subject: Re: [dpdk-dev] [PATCH v2] app/testpmd: optimized MAC swap by
> using neon intrinsics
> 
> On 3/12/2019 1:05 PM, Honnappa Nagarahalli wrote:
> >> Improved MAC swap performance for ARM platform.
> >> The improvement was achieved by using neon intrinsics to save CPU
> >> cycles and doing swap for four packets at a time.
> >> The optimization had 15% - 20% throughput boost in testpmd MAC swap
> >> mode.
> >>
> >> Signed-off-by: Ruifeng Wang <ruifeng.wang@arm.com>
> >> Reviewed-by: Gavin Hu <gavin.hu@arm.com>
> >> Reviewed-by: Phil Yang <phil.yang@arm.com>
> >> Acked-by: Jerin Jacob <jerinj@marvell.com>
> >
> > Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
> 
> Applied to dpdk-next-net/master, thanks.
> 
> What do you think adding a release notes update for this?
> If you can send it I can squash to this patch.

Thanks for your suggestion.
Release notes updated in:
http://patches.dpdk.org/patch/51247/

Regards,
/Ruifeng

Re: [dpdk-dev] [PATCH] release notes: added release notes for macswap change

[Ferruh Yigit]

On 3/18/2019 3:49 AM, Ruifeng Wang wrote:
> Updated release notes for the testpmd change which used neon intrinsics
> to do MAC swap on ARM platform.
> 
> Signed-off-by: Ruifeng Wang <ruifeng.wang@arm.com>
> Reviewed-by: Gavin Hu <gavin.hu@arm.com>

Squashed into relevant commit [1] in next-net, thanks.

[1]
app/testpmd: optimize MAC swap by using neon intrinsics
https://patches.dpdk.org/patch/51106/

Re: [dpdk-dev] [PATCH] release notes: added release notes for macswap change

[Ferruh Yigit]

On 3/18/2019 3:49 AM, Ruifeng Wang wrote:
> Updated release notes for the testpmd change which used neon intrinsics
> to do MAC swap on ARM platform.
> 
> Signed-off-by: Ruifeng Wang <ruifeng.wang@arm.com>
> Reviewed-by: Gavin Hu <gavin.hu@arm.com>

Squashed into relevant commit [1] in next-net, thanks.

[1]
app/testpmd: optimize MAC swap by using neon intrinsics
https://patches.dpdk.org/patch/51106/