net/iavf: fix processing vlan tci in vector path

  From: Zhichao Zeng <zhichaox.zeng@intel.com>

The vector RX path does not process vlan tci correctly when it's stored
in L2TAG2, so that the vlan tci could not be extracted from descriptor,
then would not be put into mbuf also.

Add processing when vlan tci is stored in L2TAG2.

Fixes: 1162f5a0ef31 ("net/iavf: support flexible Rx descriptor in SSE path")
Cc: stable@dpdk.org

Signed-off-by: Zhichao Zeng <zhichaox.zeng@intel.com>
---
 drivers/net/iavf/iavf_rxtx_vec_sse.c | 100 ++++++++++++++++++++++-----
 1 file changed, 83 insertions(+), 17 deletions(-)
  

Hi Zhichao,

The "vector" in the subject and commit log should be revised to "SSE" with a more accurate expression.

For the code part, see below. 

> -----Original Message-----
> From: Zeng, ZhichaoX <zhichaox.zeng@intel.com>
> Sent: Friday, July 22, 2022 5:30 PM
> To: dev@dpdk.org
> Cc: stable@dpdk.org; Yang, Qiming <qiming.yang@intel.com>; Zeng, ZhichaoX
> <zhichaox.zeng@intel.com>; Richardson, Bruce <bruce.richardson@intel.com>;
> Konstantin Ananyev <konstantin.v.ananyev@yandex.ru>; Wu, Jingjing
> <jingjing.wu@intel.com>; Xing, Beilei <beilei.xing@intel.com>; Zhang, Qi Z
> <qi.z.zhang@intel.com>; Rong, Leyi <leyi.rong@intel.com>
> Subject: [PATCH] net/iavf: fix processing vlan tci in vector path
> 
> From: Zhichao Zeng <zhichaox.zeng@intel.com>
> 
> The vector RX path does not process vlan tci correctly when it's stored in L2TAG2,
> so that the vlan tci could not be extracted from descriptor, then would not be
> put into mbuf also.
> 
> Add processing when vlan tci is stored in L2TAG2.
> 
> Fixes: 1162f5a0ef31 ("net/iavf: support flexible Rx descriptor in SSE path")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Zhichao Zeng <zhichaox.zeng@intel.com>
> ---
>  drivers/net/iavf/iavf_rxtx_vec_sse.c | 100 ++++++++++++++++++++++-----
>  1 file changed, 83 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/net/iavf/iavf_rxtx_vec_sse.c
> b/drivers/net/iavf/iavf_rxtx_vec_sse.c
> index 4a5232c1d2..00ca1f0c39 100644
> --- a/drivers/net/iavf/iavf_rxtx_vec_sse.c
> +++ b/drivers/net/iavf/iavf_rxtx_vec_sse.c
> @@ -208,15 +208,24 @@ flex_rxd_to_fdir_flags_vec(const __m128i fdir_id0_3)
>  	return fdir_flags;
>  }
> 
> +#ifndef RTE_LIBRTE_IAVF_16BYTE_RX_DESC
> +static inline void
> +flex_desc_to_olflags_v(struct iavf_rx_queue *rxq, __m128i descs[4], __m128i
> descs_bh[4],
> +		       struct rte_mbuf **rx_pkts)
> +#else
>  static inline void
>  flex_desc_to_olflags_v(struct iavf_rx_queue *rxq, __m128i descs[4],
>  		       struct rte_mbuf **rx_pkts)
> +#endif
>  {
>  	const __m128i mbuf_init = _mm_set_epi64x(0, rxq->mbuf_initializer);
>  	__m128i rearm0, rearm1, rearm2, rearm3;
> 
>  	__m128i tmp_desc, flags, rss_vlan;
> 
> +	unsigned long long vlan_mask = 0;
> +	if (rxq->rx_flags & IAVF_RX_FLAGS_VLAN_TAG_LOC_L2TAG1)
> +		vlan_mask = RTE_MBUF_F_RX_VLAN |

Be cautious to introduce branch statement in vector path, alternative is splitting the RSS and vlan flag processing. Better to check benchmarking data w/ and w/o this flag.

> RTE_MBUF_F_RX_VLAN_STRIPPED;
>  	/* mask everything except checksum, RSS and VLAN flags.
>  	 * bit6:4 for checksum.
>  	 * bit12 for RSS indication.
> @@ -259,8 +268,8 @@ flex_desc_to_olflags_v(struct iavf_rx_queue *rxq,
> __m128i descs[4],
>  	const __m128i rss_vlan_flags = _mm_set_epi8(0, 0, 0, 0,
>  			0, 0, 0, 0,
>  			0, 0, 0, 0,
> -			RTE_MBUF_F_RX_RSS_HASH | RTE_MBUF_F_RX_VLAN
> | RTE_MBUF_F_RX_VLAN_STRIPPED,
> -			RTE_MBUF_F_RX_VLAN |
> RTE_MBUF_F_RX_VLAN_STRIPPED,
> +			RTE_MBUF_F_RX_RSS_HASH | vlan_mask,
> +			vlan_mask,
>  			RTE_MBUF_F_RX_RSS_HASH, 0);
> 
>  	/* merge 4 descriptors */
> @@ -286,6 +295,39 @@ flex_desc_to_olflags_v(struct iavf_rx_queue *rxq,
> __m128i descs[4],
>  	/* merge the flags */
>  	flags = _mm_or_si128(flags, rss_vlan);
> 
> +#ifndef RTE_LIBRTE_IAVF_16BYTE_RX_DESC
> +	if (rxq->rx_flags & IAVF_RX_FLAGS_VLAN_TAG_LOC_L2TAG2_2) {
> +		const __m128i l2tag2_mask =
> +			_mm_set1_epi32(1 <<
> IAVF_RX_FLEX_DESC_STATUS1_L2TAG2P_S);
> +
> +		const __m128i vlan_tci0_1 =
> +			_mm_unpacklo_epi32(descs_bh[0], descs_bh[1]);
> +		const __m128i vlan_tci2_3 =
> +			_mm_unpacklo_epi32(descs_bh[2], descs_bh[3]);
> +		const __m128i vlan_tci0_3 =
> +			_mm_unpacklo_epi64(vlan_tci0_1, vlan_tci2_3);
> +
> +		__m128i vlan_bits = _mm_and_si128(vlan_tci0_3, l2tag2_mask);
> +
> +		vlan_bits = _mm_srli_epi32(vlan_bits,
> +
> 	IAVF_RX_FLEX_DESC_STATUS1_L2TAG2P_S);
> +
> +		const __m128i vlan_flags_shuf =
> +			_mm_set_epi8(0, 0, 0, 0,
> +					0, 0, 0, 0,
> +					0, 0, 0, 0,
> +					0, 0,
> +					RTE_MBUF_F_RX_VLAN |
> +					RTE_MBUF_F_RX_VLAN_STRIPPED,
> +					0);
> +
> +		const __m128i vlan_flags = _mm_shuffle_epi8(vlan_flags_shuf,
> +vlan_bits);
> +
> +		/* merge with vlan_flags */
> +		flags = _mm_or_si128(flags, vlan_flags);
> +	}
> +#endif
> +
>  	if (rxq->fdir_enabled) {
>  		const __m128i fdir_id0_1 =
>  			_mm_unpackhi_epi32(descs[0], descs[1]); @@ -748,6
> +790,9 @@ _recv_raw_pkts_vec_flex_rxd(struct iavf_rx_queue *rxq,
>  	     pos += IAVF_VPMD_DESCS_PER_LOOP,
>  	     rxdp += IAVF_VPMD_DESCS_PER_LOOP) {
>  		__m128i descs[IAVF_VPMD_DESCS_PER_LOOP];
> +#ifndef RTE_LIBRTE_IAVF_16BYTE_RX_DESC
> +		__m128i descs_bh[IAVF_VPMD_DESCS_PER_LOOP];
> +#endif
>  		__m128i pkt_mb0, pkt_mb1, pkt_mb2, pkt_mb3;
>  		__m128i staterr, sterr_tmp1, sterr_tmp2;
>  		/* 2 64 bit or 4 32 bit mbuf pointers in one XMM reg. */ @@ -
> 806,8 +851,6 @@ _recv_raw_pkts_vec_flex_rxd(struct iavf_rx_queue *rxq,
>  		/* C.1 4=>2 filter staterr info only */
>  		sterr_tmp1 = _mm_unpackhi_epi32(descs[1], descs[0]);
> 
> -		flex_desc_to_olflags_v(rxq, descs, &rx_pkts[pos]);
> -
>  		/* D.2 pkt 3,4 set in_port/nb_seg and remove crc */
>  		pkt_mb3 = _mm_add_epi16(pkt_mb3, crc_adjust);
>  		pkt_mb2 = _mm_add_epi16(pkt_mb2, crc_adjust); @@ -821,36
> +864,35 @@ _recv_raw_pkts_vec_flex_rxd(struct iavf_rx_queue *rxq,
>  		 * needs to load 2nd 16B of each desc for RSS hash parsing,
>  		 * will cause performance drop to get into this context.
>  		 */
> -		if (offloads & RTE_ETH_RX_OFFLOAD_RSS_HASH) {
> +		if (offloads & RTE_ETH_RX_OFFLOAD_RSS_HASH ||
> +			rxq->rx_flags &
> IAVF_RX_FLAGS_VLAN_TAG_LOC_L2TAG2_2) {
>  			/* load bottom half of every 32B desc */
> -			const __m128i raw_desc_bh3 =
> -				_mm_load_si128
> +			descs_bh[3] = _mm_load_si128
>  					((void *)(&rxdp[3].wb.status_error1));
>  			rte_compiler_barrier();
> -			const __m128i raw_desc_bh2 =
> -				_mm_load_si128
> +			descs_bh[2] = _mm_load_si128
>  					((void *)(&rxdp[2].wb.status_error1));
>  			rte_compiler_barrier();
> -			const __m128i raw_desc_bh1 =
> -				_mm_load_si128
> +			descs_bh[1] = _mm_load_si128
>  					((void *)(&rxdp[1].wb.status_error1));
>  			rte_compiler_barrier();
> -			const __m128i raw_desc_bh0 =
> -				_mm_load_si128
> +			descs_bh[0] = _mm_load_si128
>  					((void *)(&rxdp[0].wb.status_error1));
> +		}
> 
> +		if (offloads & RTE_ETH_RX_OFFLOAD_RSS_HASH) {
>  			/**
>  			 * to shift the 32b RSS hash value to the
>  			 * highest 32b of each 128b before mask
>  			 */
>  			__m128i rss_hash3 =
> -				_mm_slli_epi64(raw_desc_bh3, 32);
> +				_mm_slli_epi64(descs_bh[3], 32);
>  			__m128i rss_hash2 =
> -				_mm_slli_epi64(raw_desc_bh2, 32);
> +				_mm_slli_epi64(descs_bh[2], 32);
>  			__m128i rss_hash1 =
> -				_mm_slli_epi64(raw_desc_bh1, 32);
> +				_mm_slli_epi64(descs_bh[1], 32);
>  			__m128i rss_hash0 =
> -				_mm_slli_epi64(raw_desc_bh0, 32);
> +				_mm_slli_epi64(descs_bh[0], 32);
> 
>  			__m128i rss_hash_msk =
>  				_mm_set_epi32(0xFFFFFFFF, 0, 0, 0); @@ -
> 869,6 +911,30 @@ _recv_raw_pkts_vec_flex_rxd(struct iavf_rx_queue *rxq,
>  			pkt_mb1 = _mm_or_si128(pkt_mb1, rss_hash1);
>  			pkt_mb0 = _mm_or_si128(pkt_mb0, rss_hash0);
>  		} /* if() on RSS hash parsing */
> +
> +		if (rxq->rx_flags & IAVF_RX_FLAGS_VLAN_TAG_LOC_L2TAG2_2)
> {
> +			/* L2TAG2_2 */
> +			__m128i vlan_tci3 = _mm_slli_si128(descs_bh[3], 4);
> +			__m128i vlan_tci2 = _mm_slli_si128(descs_bh[2], 4);
> +			__m128i vlan_tci1 = _mm_slli_si128(descs_bh[1], 4);
> +			__m128i vlan_tci0 = _mm_slli_si128(descs_bh[0], 4);
> +
> +			const __m128i vlan_tci_msk = _mm_set_epi32(0,
> 0xFFFF0000, 0, 0);
> +
> +			vlan_tci3 = _mm_and_si128(vlan_tci3, vlan_tci_msk);
> +			vlan_tci2 = _mm_and_si128(vlan_tci2, vlan_tci_msk);
> +			vlan_tci1 = _mm_and_si128(vlan_tci1, vlan_tci_msk);
> +			vlan_tci0 = _mm_and_si128(vlan_tci0, vlan_tci_msk);
> +
> +			pkt_mb3 = _mm_or_si128(pkt_mb3, vlan_tci3);
> +			pkt_mb2 = _mm_or_si128(pkt_mb2, vlan_tci2);
> +			pkt_mb1 = _mm_or_si128(pkt_mb1, vlan_tci1);
> +			pkt_mb0 = _mm_or_si128(pkt_mb0, vlan_tci0);
> +		}
> +
> +		flex_desc_to_olflags_v(rxq, descs, descs_bh, &rx_pkts[pos]);
> #else
> +		flex_desc_to_olflags_v(rxq, descs, &rx_pkts[pos]);
>  #endif
> 
>  		/* C.2 get 4 pkts staterr value  */
> --
> 2.25.1