[dpdk-dev] [PATCH 06/12] net/iavf: flexible Rx descriptor support in SSE path

[Leyi Rong <leyi.rong@intel.com>]

Support flexible Rx descriptor format in SSE
path of iAVF PMD.

Signed-off-by: Leyi Rong <leyi.rong@intel.com>
---
 drivers/net/iavf/iavf_rxtx.c         |   4 +-
 drivers/net/iavf/iavf_rxtx.h         |   5 +
 drivers/net/iavf/iavf_rxtx_vec_sse.c | 414 +++++++++++++++++++++++++++
 3 files changed, 421 insertions(+), 2 deletions(-)

diff --git a/drivers/net/iavf/iavf_rxtx.c b/drivers/net/iavf/iavf_rxtx.c
index 57fffece9..5d484d5e9 100644
--- a/drivers/net/iavf/iavf_rxtx.c
+++ b/drivers/net/iavf/iavf_rxtx.c
@@ -2119,7 +2119,7 @@ iavf_set_rx_function(struct rte_eth_dev *dev)
 				VIRTCHNL_VF_OFFLOAD_RX_FLEX_DESC)
 				dev->rx_pkt_burst = use_avx2 ?
 					iavf_recv_scattered_pkts_vec_avx2_flex_rxd :
-					iavf_recv_scattered_pkts_vec;
+					iavf_recv_scattered_pkts_vec_flex_rxd;
 			else
 				dev->rx_pkt_burst = use_avx2 ?
 					iavf_recv_scattered_pkts_vec_avx2 :
@@ -2132,7 +2132,7 @@ iavf_set_rx_function(struct rte_eth_dev *dev)
 				VIRTCHNL_VF_OFFLOAD_RX_FLEX_DESC)
 				dev->rx_pkt_burst = use_avx2 ?
 					iavf_recv_pkts_vec_avx2_flex_rxd :
-					iavf_recv_pkts_vec;
+					iavf_recv_pkts_vec_flex_rxd;
 			else
 				dev->rx_pkt_burst = use_avx2 ?
 					iavf_recv_pkts_vec_avx2 :
diff --git a/drivers/net/iavf/iavf_rxtx.h b/drivers/net/iavf/iavf_rxtx.h
index de13fd516..c85207dae 100644
--- a/drivers/net/iavf/iavf_rxtx.h
+++ b/drivers/net/iavf/iavf_rxtx.h
@@ -205,9 +205,14 @@ int iavf_dev_tx_desc_status(void *tx_queue, uint16_t offset);
 
 uint16_t iavf_recv_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts,
 			   uint16_t nb_pkts);
+uint16_t iavf_recv_pkts_vec_flex_rxd(void *rx_queue, struct rte_mbuf **rx_pkts,
+				     uint16_t nb_pkts);
 uint16_t iavf_recv_scattered_pkts_vec(void *rx_queue,
 				     struct rte_mbuf **rx_pkts,
 				     uint16_t nb_pkts);
+uint16_t iavf_recv_scattered_pkts_vec_flex_rxd(void *rx_queue,
+					       struct rte_mbuf **rx_pkts,
+					       uint16_t nb_pkts);
 uint16_t iavf_xmit_fixed_burst_vec(void *tx_queue, struct rte_mbuf **tx_pkts,
 				  uint16_t nb_pkts);
 uint16_t iavf_recv_pkts_vec_avx2(void *rx_queue, struct rte_mbuf **rx_pkts,
diff --git a/drivers/net/iavf/iavf_rxtx_vec_sse.c b/drivers/net/iavf/iavf_rxtx_vec_sse.c
index 0365c49e1..9c1f2a445 100644
--- a/drivers/net/iavf/iavf_rxtx_vec_sse.c
+++ b/drivers/net/iavf/iavf_rxtx_vec_sse.c
@@ -189,6 +189,109 @@ desc_to_olflags_v(struct iavf_rx_queue *rxq, __m128i descs[4],
 	_mm_store_si128((__m128i *)&rx_pkts[3]->rearm_data, rearm3);
 }
 
+static inline void
+flex_desc_to_olflags_v(struct iavf_rx_queue *rxq, __m128i descs[4],
+		       struct rte_mbuf **rx_pkts)
+{
+	const __m128i mbuf_init = _mm_set_epi64x(0, rxq->mbuf_initializer);
+	__m128i rearm0, rearm1, rearm2, rearm3;
+
+	__m128i tmp_desc, flags, rss_vlan;
+
+	/* mask everything except checksum, RSS and VLAN flags.
+	 * bit6:4 for checksum.
+	 * bit12 for RSS indication.
+	 * bit13 for VLAN indication.
+	 */
+	const __m128i desc_mask = _mm_set_epi32(0x3070, 0x3070,
+						0x3070, 0x3070);
+
+	const __m128i cksum_mask = _mm_set_epi32(PKT_RX_IP_CKSUM_MASK |
+						 PKT_RX_L4_CKSUM_MASK |
+						 PKT_RX_EIP_CKSUM_BAD,
+						 PKT_RX_IP_CKSUM_MASK |
+						 PKT_RX_L4_CKSUM_MASK |
+						 PKT_RX_EIP_CKSUM_BAD,
+						 PKT_RX_IP_CKSUM_MASK |
+						 PKT_RX_L4_CKSUM_MASK |
+						 PKT_RX_EIP_CKSUM_BAD,
+						 PKT_RX_IP_CKSUM_MASK |
+						 PKT_RX_L4_CKSUM_MASK |
+						 PKT_RX_EIP_CKSUM_BAD);
+
+	/* map the checksum, rss and vlan fields to the checksum, rss
+	 * and vlan flag
+	 */
+	const __m128i cksum_flags = _mm_set_epi8(0, 0, 0, 0, 0, 0, 0, 0,
+			/* shift right 1 bit to make sure it not exceed 255 */
+			(PKT_RX_EIP_CKSUM_BAD | PKT_RX_L4_CKSUM_BAD |
+			 PKT_RX_IP_CKSUM_BAD) >> 1,
+			(PKT_RX_EIP_CKSUM_BAD | PKT_RX_L4_CKSUM_BAD |
+			 PKT_RX_IP_CKSUM_GOOD) >> 1,
+			(PKT_RX_EIP_CKSUM_BAD | PKT_RX_L4_CKSUM_GOOD |
+			 PKT_RX_IP_CKSUM_BAD) >> 1,
+			(PKT_RX_EIP_CKSUM_BAD | PKT_RX_L4_CKSUM_GOOD |
+			 PKT_RX_IP_CKSUM_GOOD) >> 1,
+			(PKT_RX_L4_CKSUM_BAD | PKT_RX_IP_CKSUM_BAD) >> 1,
+			(PKT_RX_L4_CKSUM_BAD | PKT_RX_IP_CKSUM_GOOD) >> 1,
+			(PKT_RX_L4_CKSUM_GOOD | PKT_RX_IP_CKSUM_BAD) >> 1,
+			(PKT_RX_L4_CKSUM_GOOD | PKT_RX_IP_CKSUM_GOOD) >> 1);
+
+	const __m128i rss_vlan_flags = _mm_set_epi8(0, 0, 0, 0,
+			0, 0, 0, 0,
+			0, 0, 0, 0,
+			PKT_RX_RSS_HASH | PKT_RX_VLAN | PKT_RX_VLAN_STRIPPED,
+			PKT_RX_VLAN | PKT_RX_VLAN_STRIPPED,
+			PKT_RX_RSS_HASH, 0);
+
+	/* merge 4 descriptors */
+	flags = _mm_unpackhi_epi32(descs[0], descs[1]);
+	tmp_desc = _mm_unpackhi_epi32(descs[2], descs[3]);
+	tmp_desc = _mm_unpacklo_epi64(flags, tmp_desc);
+	tmp_desc = _mm_and_si128(flags, desc_mask);
+
+	/* checksum flags */
+	tmp_desc = _mm_srli_epi32(tmp_desc, 4);
+	flags = _mm_shuffle_epi8(cksum_flags, tmp_desc);
+	/* then we shift left 1 bit */
+	flags = _mm_slli_epi32(flags, 1);
+	/* we need to mask out the reduntant bits introduced by RSS or
+	 * VLAN fields.
+	 */
+	flags = _mm_and_si128(flags, cksum_mask);
+
+	/* RSS, VLAN flag */
+	tmp_desc = _mm_srli_epi32(tmp_desc, 8);
+	rss_vlan = _mm_shuffle_epi8(rss_vlan_flags, tmp_desc);
+
+	/* merge the flags */
+	flags = _mm_or_si128(flags, rss_vlan);
+
+	/**
+	 * At this point, we have the 4 sets of flags in the low 16-bits
+	 * of each 32-bit value in flags.
+	 * We want to extract these, and merge them with the mbuf init data
+	 * so we can do a single 16-byte write to the mbuf to set the flags
+	 * and all the other initialization fields. Extracting the
+	 * appropriate flags means that we have to do a shift and blend for
+	 * each mbuf before we do the write.
+	 */
+	rearm0 = _mm_blend_epi16(mbuf_init, _mm_slli_si128(flags, 8), 0x10);
+	rearm1 = _mm_blend_epi16(mbuf_init, _mm_slli_si128(flags, 4), 0x10);
+	rearm2 = _mm_blend_epi16(mbuf_init, flags, 0x10);
+	rearm3 = _mm_blend_epi16(mbuf_init, _mm_srli_si128(flags, 4), 0x10);
+
+	/* write the rearm data and the olflags in one write */
+	RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, ol_flags) !=
+			 offsetof(struct rte_mbuf, rearm_data) + 8);
+	RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, rearm_data) !=
+			 RTE_ALIGN(offsetof(struct rte_mbuf, rearm_data), 16));
+	_mm_store_si128((__m128i *)&rx_pkts[0]->rearm_data, rearm0);
+	_mm_store_si128((__m128i *)&rx_pkts[1]->rearm_data, rearm1);
+	_mm_store_si128((__m128i *)&rx_pkts[2]->rearm_data, rearm2);
+	_mm_store_si128((__m128i *)&rx_pkts[3]->rearm_data, rearm3);
+}
+
 #define PKTLEN_SHIFT     10
 
 static inline void
@@ -207,6 +310,26 @@ desc_to_ptype_v(__m128i descs[4], struct rte_mbuf **rx_pkts,
 	rx_pkts[3]->packet_type = type_table[_mm_extract_epi8(ptype1, 8)];
 }
 
+static inline void
+flex_desc_to_ptype_v(__m128i descs[4], struct rte_mbuf **rx_pkts,
+		     const uint32_t *type_table)
+{
+	const __m128i ptype_mask = _mm_set_epi16(0, IAVF_RX_FLEX_DESC_PTYPE_M,
+						 0, IAVF_RX_FLEX_DESC_PTYPE_M,
+						 0, IAVF_RX_FLEX_DESC_PTYPE_M,
+						 0, IAVF_RX_FLEX_DESC_PTYPE_M);
+	__m128i ptype_01 = _mm_unpacklo_epi32(descs[0], descs[1]);
+	__m128i ptype_23 = _mm_unpacklo_epi32(descs[2], descs[3]);
+	__m128i ptype_all = _mm_unpacklo_epi64(ptype_01, ptype_23);
+
+	ptype_all = _mm_and_si128(ptype_all, ptype_mask);
+
+	rx_pkts[0]->packet_type = type_table[_mm_extract_epi16(ptype_all, 1)];
+	rx_pkts[1]->packet_type = type_table[_mm_extract_epi16(ptype_all, 3)];
+	rx_pkts[2]->packet_type = type_table[_mm_extract_epi16(ptype_all, 5)];
+	rx_pkts[3]->packet_type = type_table[_mm_extract_epi16(ptype_all, 7)];
+}
+
 /* Notice:
  * - nb_pkts < IAVF_VPMD_DESCS_PER_LOOP, just return no packet
  * - nb_pkts > IAVF_VPMD_RX_MAX_BURST, only scan IAVF_VPMD_RX_MAX_BURST
@@ -455,6 +578,243 @@ _recv_raw_pkts_vec(struct iavf_rx_queue *rxq, struct rte_mbuf **rx_pkts,
 	return nb_pkts_recd;
 }
 
+/* Notice:
+ * - nb_pkts < IAVF_VPMD_DESCS_PER_LOOP, just return no packet
+ * - nb_pkts > IAVF_VPMD_RX_MAX_BURST, only scan IAVF_VPMD_RX_MAX_BURST
+ *   numbers of DD bits
+ */
+static inline uint16_t
+_recv_raw_pkts_vec_flex_rxd(struct iavf_rx_queue *rxq,
+			    struct rte_mbuf **rx_pkts,
+			    uint16_t nb_pkts, uint8_t *split_packet)
+{
+	volatile union iavf_rx_flex_desc *rxdp;
+	struct rte_mbuf **sw_ring;
+	uint16_t nb_pkts_recd;
+	int pos;
+	uint64_t var;
+	const uint32_t *ptype_tbl = rxq->vsi->adapter->ptype_tbl;
+	__m128i crc_adjust = _mm_set_epi16
+				(0, 0, 0,       /* ignore non-length fields */
+				 -rxq->crc_len, /* sub crc on data_len */
+				 0,          /* ignore high-16bits of pkt_len */
+				 -rxq->crc_len, /* sub crc on pkt_len */
+				 0, 0           /* ignore pkt_type field */
+				);
+	const __m128i zero = _mm_setzero_si128();
+	/* mask to shuffle from desc. to mbuf */
+	const __m128i shuf_msk = _mm_set_epi8
+			(15, 14, 13, 12,  /* octet 12~15, 32 bits rss */
+			 11, 10,      /* octet 10~11, 16 bits vlan_macip */
+			 5, 4,        /* octet 4~5, 16 bits data_len */
+			 0xFF, 0xFF,  /* skip high 16 bits pkt_len, zero out */
+			 5, 4,        /* octet 4~5, low 16 bits pkt_len */
+			 0xFF, 0xFF,  /* pkt_type set as unknown */
+			 0xFF, 0xFF   /* pkt_type set as unknown */
+			);
+	const __m128i eop_shuf_mask = _mm_set_epi8(0xFF, 0xFF,
+						   0xFF, 0xFF,
+						   0xFF, 0xFF,
+						   0xFF, 0xFF,
+						   0xFF, 0xFF,
+						   0xFF, 0xFF,
+						   0x04, 0x0C,
+						   0x00, 0x08);
+
+	/**
+	 * compile-time check the above crc_adjust layout is correct.
+	 * NOTE: the first field (lowest address) is given last in set_epi16
+	 * call above.
+	 */
+	RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, pkt_len) !=
+			 offsetof(struct rte_mbuf, rx_descriptor_fields1) + 4);
+	RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, data_len) !=
+			 offsetof(struct rte_mbuf, rx_descriptor_fields1) + 8);
+
+	/* 4 packets DD mask */
+	const __m128i dd_check = _mm_set_epi64x(0x0000000100000001LL,
+						0x0000000100000001LL);
+	/* 4 packets EOP mask */
+	const __m128i eop_check = _mm_set_epi64x(0x0000000200000002LL,
+						 0x0000000200000002LL);
+
+	/* nb_pkts shall be less equal than IAVF_VPMD_RX_MAX_BURST */
+	nb_pkts = RTE_MIN(nb_pkts, IAVF_VPMD_RX_MAX_BURST);
+
+	/* nb_pkts has to be floor-aligned to IAVF_VPMD_DESCS_PER_LOOP */
+	nb_pkts = RTE_ALIGN_FLOOR(nb_pkts, IAVF_VPMD_DESCS_PER_LOOP);
+
+	/* Just the act of getting into the function from the application is
+	 * going to cost about 7 cycles
+	 */
+	rxdp = (union iavf_rx_flex_desc *)rxq->rx_ring + rxq->rx_tail;
+
+	rte_prefetch0(rxdp);
+
+	/* See if we need to rearm the RX queue - gives the prefetch a bit
+	 * of time to act
+	 */
+	if (rxq->rxrearm_nb > rxq->rx_free_thresh)
+		iavf_rxq_rearm(rxq);
+
+	/* Before we start moving massive data around, check to see if
+	 * there is actually a packet available
+	 */
+	if (!(rxdp->wb.status_error0 &
+	      rte_cpu_to_le_32(1 << IAVF_RX_FLEX_DESC_STATUS0_DD_S)))
+		return 0;
+
+	/**
+	 * Compile-time verify the shuffle mask
+	 * NOTE: some field positions already verified above, but duplicated
+	 * here for completeness in case of future modifications.
+	 */
+	RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, pkt_len) !=
+			 offsetof(struct rte_mbuf, rx_descriptor_fields1) + 4);
+	RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, data_len) !=
+			 offsetof(struct rte_mbuf, rx_descriptor_fields1) + 8);
+	RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, vlan_tci) !=
+			 offsetof(struct rte_mbuf, rx_descriptor_fields1) + 10);
+	RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, hash) !=
+			 offsetof(struct rte_mbuf, rx_descriptor_fields1) + 12);
+
+	/* Cache is empty -> need to scan the buffer rings, but first move
+	 * the next 'n' mbufs into the cache
+	 */
+	sw_ring = &rxq->sw_ring[rxq->rx_tail];
+
+	/* A. load 4 packet in one loop
+	 * [A*. mask out 4 unused dirty field in desc]
+	 * B. copy 4 mbuf point from swring to rx_pkts
+	 * C. calc the number of DD bits among the 4 packets
+	 * [C*. extract the end-of-packet bit, if requested]
+	 * D. fill info. from desc to mbuf
+	 */
+
+	for (pos = 0, nb_pkts_recd = 0; pos < nb_pkts;
+	     pos += IAVF_VPMD_DESCS_PER_LOOP,
+	     rxdp += IAVF_VPMD_DESCS_PER_LOOP) {
+		__m128i descs[IAVF_VPMD_DESCS_PER_LOOP];
+		__m128i pkt_mb1, pkt_mb2, pkt_mb3, pkt_mb4;
+		__m128i staterr, sterr_tmp1, sterr_tmp2;
+		/* 2 64 bit or 4 32 bit mbuf pointers in one XMM reg. */
+		__m128i mbp1;
+#if defined(RTE_ARCH_X86_64)
+		__m128i mbp2;
+#endif
+
+		/* B.1 load 2 (64 bit) or 4 (32 bit) mbuf points */
+		mbp1 = _mm_loadu_si128((__m128i *)&sw_ring[pos]);
+		/* Read desc statuses backwards to avoid race condition */
+		/* A.1 load 4 pkts desc */
+		descs[3] = _mm_loadu_si128((__m128i *)(rxdp + 3));
+		rte_compiler_barrier();
+
+		/* B.2 copy 2 64 bit or 4 32 bit mbuf point into rx_pkts */
+		_mm_storeu_si128((__m128i *)&rx_pkts[pos], mbp1);
+
+#if defined(RTE_ARCH_X86_64)
+		/* B.1 load 2 64 bit mbuf points */
+		mbp2 = _mm_loadu_si128((__m128i *)&sw_ring[pos + 2]);
+#endif
+
+		descs[2] = _mm_loadu_si128((__m128i *)(rxdp + 2));
+		rte_compiler_barrier();
+		/* B.1 load 2 mbuf point */
+		descs[1] = _mm_loadu_si128((__m128i *)(rxdp + 1));
+		rte_compiler_barrier();
+		descs[0] = _mm_loadu_si128((__m128i *)(rxdp));
+
+#if defined(RTE_ARCH_X86_64)
+		/* B.2 copy 2 mbuf point into rx_pkts  */
+		_mm_storeu_si128((__m128i *)&rx_pkts[pos + 2], mbp2);
+#endif
+
+		if (split_packet) {
+			rte_mbuf_prefetch_part2(rx_pkts[pos]);
+			rte_mbuf_prefetch_part2(rx_pkts[pos + 1]);
+			rte_mbuf_prefetch_part2(rx_pkts[pos + 2]);
+			rte_mbuf_prefetch_part2(rx_pkts[pos + 3]);
+		}
+
+		/* avoid compiler reorder optimization */
+		rte_compiler_barrier();
+
+		/* D.1 pkt 3,4 convert format from desc to pktmbuf */
+		pkt_mb4 = _mm_shuffle_epi8(descs[3], shuf_msk);
+		pkt_mb3 = _mm_shuffle_epi8(descs[2], shuf_msk);
+
+		/* C.1 4=>2 filter staterr info only */
+		sterr_tmp2 = _mm_unpackhi_epi32(descs[3], descs[2]);
+		/* 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_mb4 = _mm_add_epi16(pkt_mb4, crc_adjust);
+		pkt_mb3 = _mm_add_epi16(pkt_mb3, crc_adjust);
+
+		/* D.1 pkt 1,2 convert format from desc to pktmbuf */
+		pkt_mb2 = _mm_shuffle_epi8(descs[1], shuf_msk);
+		pkt_mb1 = _mm_shuffle_epi8(descs[0], shuf_msk);
+
+		/* C.2 get 4 pkts staterr value  */
+		staterr = _mm_unpacklo_epi32(sterr_tmp1, sterr_tmp2);
+
+		/* D.3 copy final 3,4 data to rx_pkts */
+		_mm_storeu_si128
+			((void *)&rx_pkts[pos + 3]->rx_descriptor_fields1,
+			 pkt_mb4);
+		_mm_storeu_si128
+			((void *)&rx_pkts[pos + 2]->rx_descriptor_fields1,
+			 pkt_mb3);
+
+		/* D.2 pkt 1,2 set in_port/nb_seg and remove crc */
+		pkt_mb2 = _mm_add_epi16(pkt_mb2, crc_adjust);
+		pkt_mb1 = _mm_add_epi16(pkt_mb1, crc_adjust);
+
+		/* C* extract and record EOP bit */
+		if (split_packet) {
+			/* and with mask to extract bits, flipping 1-0 */
+			__m128i eop_bits = _mm_andnot_si128(staterr, eop_check);
+			/* the staterr values are not in order, as the count
+			 * count of dd bits doesn't care. However, for end of
+			 * packet tracking, we do care, so shuffle. This also
+			 * compresses the 32-bit values to 8-bit
+			 */
+			eop_bits = _mm_shuffle_epi8(eop_bits, eop_shuf_mask);
+			/* store the resulting 32-bit value */
+			*(int *)split_packet = _mm_cvtsi128_si32(eop_bits);
+			split_packet += IAVF_VPMD_DESCS_PER_LOOP;
+		}
+
+		/* C.3 calc available number of desc */
+		staterr = _mm_and_si128(staterr, dd_check);
+		staterr = _mm_packs_epi32(staterr, zero);
+
+		/* D.3 copy final 1,2 data to rx_pkts */
+		_mm_storeu_si128
+			((void *)&rx_pkts[pos + 1]->rx_descriptor_fields1,
+			 pkt_mb2);
+		_mm_storeu_si128((void *)&rx_pkts[pos]->rx_descriptor_fields1,
+				 pkt_mb1);
+		flex_desc_to_ptype_v(descs, &rx_pkts[pos], ptype_tbl);
+		/* C.4 calc avaialbe number of desc */
+		var = __builtin_popcountll(_mm_cvtsi128_si64(staterr));
+		nb_pkts_recd += var;
+		if (likely(var != IAVF_VPMD_DESCS_PER_LOOP))
+			break;
+	}
+
+	/* Update our internal tail pointer */
+	rxq->rx_tail = (uint16_t)(rxq->rx_tail + nb_pkts_recd);
+	rxq->rx_tail = (uint16_t)(rxq->rx_tail & (rxq->nb_rx_desc - 1));
+	rxq->rxrearm_nb = (uint16_t)(rxq->rxrearm_nb + nb_pkts_recd);
+
+	return nb_pkts_recd;
+}
+
 /* Notice:
  * - nb_pkts < IAVF_DESCS_PER_LOOP, just return no packet
  * - nb_pkts > IAVF_VPMD_RX_MAX_BURST, only scan IAVF_VPMD_RX_MAX_BURST
@@ -467,6 +827,18 @@ iavf_recv_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts,
 	return _recv_raw_pkts_vec(rx_queue, rx_pkts, nb_pkts, NULL);
 }
 
+/* Notice:
+ * - nb_pkts < IAVF_DESCS_PER_LOOP, just return no packet
+ * - nb_pkts > IAVF_VPMD_RX_MAX_BURST, only scan IAVF_VPMD_RX_MAX_BURST
+ *   numbers of DD bits
+ */
+uint16_t
+iavf_recv_pkts_vec_flex_rxd(void *rx_queue, struct rte_mbuf **rx_pkts,
+			    uint16_t nb_pkts)
+{
+	return _recv_raw_pkts_vec_flex_rxd(rx_queue, rx_pkts, nb_pkts, NULL);
+}
+
 /* vPMD receive routine that reassembles scattered packets
  * Notice:
  * - nb_pkts < IAVF_VPMD_DESCS_PER_LOOP, just return no packet
@@ -508,6 +880,48 @@ iavf_recv_scattered_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts,
 		&split_flags[i]);
 }
 
+/* vPMD receive routine that reassembles scattered packets for flex RxD
+ * Notice:
+ * - nb_pkts < IAVF_VPMD_DESCS_PER_LOOP, just return no packet
+ * - nb_pkts > VPMD_RX_MAX_BURST, only scan IAVF_VPMD_RX_MAX_BURST
+ *   numbers of DD bits
+ */
+uint16_t
+iavf_recv_scattered_pkts_vec_flex_rxd(void *rx_queue,
+				      struct rte_mbuf **rx_pkts,
+				      uint16_t nb_pkts)
+{
+	struct iavf_rx_queue *rxq = rx_queue;
+	uint8_t split_flags[IAVF_VPMD_RX_MAX_BURST] = {0};
+	unsigned int i = 0;
+
+	/* get some new buffers */
+	uint16_t nb_bufs = _recv_raw_pkts_vec_flex_rxd(rxq, rx_pkts, nb_pkts,
+					      split_flags);
+	if (nb_bufs == 0)
+		return 0;
+
+	/* happy day case, full burst + no packets to be joined */
+	const uint64_t *split_fl64 = (uint64_t *)split_flags;
+
+	if (!rxq->pkt_first_seg &&
+	    split_fl64[0] == 0 && split_fl64[1] == 0 &&
+	    split_fl64[2] == 0 && split_fl64[3] == 0)
+		return nb_bufs;
+
+	/* reassemble any packets that need reassembly*/
+	if (!rxq->pkt_first_seg) {
+		/* find the first split flag, and only reassemble then*/
+		while (i < nb_bufs && !split_flags[i])
+			i++;
+		if (i == nb_bufs)
+			return nb_bufs;
+		rxq->pkt_first_seg = rx_pkts[i];
+	}
+	return i + reassemble_packets(rxq, &rx_pkts[i], nb_bufs - i,
+		&split_flags[i]);
+}
+
 static inline void
 vtx1(volatile struct iavf_tx_desc *txdp, struct rte_mbuf *pkt, uint64_t flags)
 {
-- 
2.17.1