[dpdk-dev] [PATCH 1/4 v3] add vector PMD RX for FVL

Zhe Tao zhe.tao at intel.com
Fri Oct 30 14:01:52 CET 2015


The vPMD RX function uses the multi-buffer and SSE instructions to
accelerate the RX speed, but now the pktype cannot be supported by the vPMD RX,
because it will decrease the performance heavily.

Signed-off-by: Zhe Tao <zhe.tao at intel.com>
---
 config/common_bsdapp             |   2 +
 config/common_linuxapp           |   2 +
 drivers/net/i40e/Makefile        |   1 +
 drivers/net/i40e/i40e_rxtx.c     |  28 ++-
 drivers/net/i40e/i40e_rxtx.h     |  28 ++-
 drivers/net/i40e/i40e_rxtx_vec.c | 484 +++++++++++++++++++++++++++++++++++++++
 6 files changed, 540 insertions(+), 5 deletions(-)
 create mode 100644 drivers/net/i40e/i40e_rxtx_vec.c

diff --git a/config/common_bsdapp b/config/common_bsdapp
index b37dcf4..3003da5 100644
--- a/config/common_bsdapp
+++ b/config/common_bsdapp
@@ -186,6 +186,8 @@ CONFIG_RTE_LIBRTE_I40E_DEBUG_TX=n
 CONFIG_RTE_LIBRTE_I40E_DEBUG_TX_FREE=n
 CONFIG_RTE_LIBRTE_I40E_DEBUG_DRIVER=n
 CONFIG_RTE_LIBRTE_I40E_RX_ALLOW_BULK_ALLOC=y
+CONFIG_RTE_LIBRTE_I40E_INC_VECTOR=y
+CONFIG_RTE_LIBRTE_I40E_RX_OLFLAGS_ENABLE=y
 CONFIG_RTE_LIBRTE_I40E_16BYTE_RX_DESC=n
 CONFIG_RTE_LIBRTE_I40E_QUEUE_NUM_PER_VF=4
 CONFIG_RTE_LIBRTE_I40E_QUEUE_NUM_PER_VM=4
diff --git a/config/common_linuxapp b/config/common_linuxapp
index 0de43d5..dadba4d 100644
--- a/config/common_linuxapp
+++ b/config/common_linuxapp
@@ -184,6 +184,8 @@ CONFIG_RTE_LIBRTE_I40E_DEBUG_TX=n
 CONFIG_RTE_LIBRTE_I40E_DEBUG_TX_FREE=n
 CONFIG_RTE_LIBRTE_I40E_DEBUG_DRIVER=n
 CONFIG_RTE_LIBRTE_I40E_RX_ALLOW_BULK_ALLOC=y
+CONFIG_RTE_LIBRTE_I40E_INC_VECTOR=y
+CONFIG_RTE_LIBRTE_I40E_RX_OLFLAGS_ENABLE=y
 CONFIG_RTE_LIBRTE_I40E_16BYTE_RX_DESC=n
 CONFIG_RTE_LIBRTE_I40E_QUEUE_NUM_PER_VF=4
 CONFIG_RTE_LIBRTE_I40E_QUEUE_NUM_PER_VM=4
diff --git a/drivers/net/i40e/Makefile b/drivers/net/i40e/Makefile
index 55b7d31..d4695cb 100644
--- a/drivers/net/i40e/Makefile
+++ b/drivers/net/i40e/Makefile
@@ -95,6 +95,7 @@ SRCS-$(CONFIG_RTE_LIBRTE_I40E_PMD) += i40e_dcb.c
 
 SRCS-$(CONFIG_RTE_LIBRTE_I40E_PMD) += i40e_ethdev.c
 SRCS-$(CONFIG_RTE_LIBRTE_I40E_PMD) += i40e_rxtx.c
+SRCS-$(CONFIG_RTE_LIBRTE_I40E_INC_VECTOR) += i40e_rxtx_vec.c
 SRCS-$(CONFIG_RTE_LIBRTE_I40E_PMD) += i40e_ethdev_vf.c
 SRCS-$(CONFIG_RTE_LIBRTE_I40E_PMD) += i40e_pf.c
 SRCS-$(CONFIG_RTE_LIBRTE_I40E_PMD) += i40e_fdir.c
diff --git a/drivers/net/i40e/i40e_rxtx.c b/drivers/net/i40e/i40e_rxtx.c
index fd656d5..dfdc7d5 100644
--- a/drivers/net/i40e/i40e_rxtx.c
+++ b/drivers/net/i40e/i40e_rxtx.c
@@ -1788,9 +1788,6 @@ i40e_tx_free_bufs(struct i40e_tx_queue *txq)
 	return txq->tx_rs_thresh;
 }
 
-#define I40E_TD_CMD (I40E_TX_DESC_CMD_ICRC |\
-		     I40E_TX_DESC_CMD_EOP)
-
 /* Populate 4 descriptors with data from 4 mbufs */
 static inline void
 tx4(volatile struct i40e_tx_desc *txdp, struct rte_mbuf **pkts)
@@ -2625,6 +2622,9 @@ i40e_reset_rx_queue(struct i40e_rx_queue *rxq)
 	rxq->nb_rx_hold = 0;
 	rxq->pkt_first_seg = NULL;
 	rxq->pkt_last_seg = NULL;
+
+	rxq->rxrearm_start = 0;
+	rxq->rxrearm_nb = 0;
 }
 
 void
@@ -3063,3 +3063,25 @@ i40e_fdir_setup_rx_resources(struct i40e_pf *pf)
 
 	return I40E_SUCCESS;
 }
+
+/* Stubs needed for linkage when CONFIG_RTE_I40E_INC_VECTOR is set to 'n' */
+uint16_t __attribute__((weak))
+i40e_recv_pkts_vec(
+	void __rte_unused *rx_queue,
+	struct rte_mbuf __rte_unused **rx_pkts,
+	uint16_t __rte_unused nb_pkts)
+{
+	return 0;
+}
+
+int __attribute__((weak))
+i40e_rxq_vec_setup(struct i40e_rx_queue __rte_unused *rxq)
+{
+	return -1;
+}
+
+void __attribute__((weak))
+i40e_rx_queue_release_mbufs_vec(struct i40e_rx_queue __rte_unused*rxq)
+{
+	return;
+}
diff --git a/drivers/net/i40e/i40e_rxtx.h b/drivers/net/i40e/i40e_rxtx.h
index 4385142..961a415 100644
--- a/drivers/net/i40e/i40e_rxtx.h
+++ b/drivers/net/i40e/i40e_rxtx.h
@@ -44,13 +44,27 @@
 #define I40E_TX_FLAG_INSERT_VLAN  ((uint32_t)(1 << 1))
 #define I40E_TX_FLAG_TSYN         ((uint32_t)(1 << 2))
 
-#ifdef RTE_LIBRTE_I40E_RX_ALLOW_BULK_ALLOC
 #define RTE_PMD_I40E_RX_MAX_BURST 32
-#endif
+#define RTE_PMD_I40E_TX_MAX_BURST 32
+
+#define RTE_I40E_VPMD_RX_BURST        32
+#define RTE_I40E_VPMD_TX_BURST        32
+#define RTE_I40E_RXQ_REARM_THRESH      32
+#define RTE_I40E_MAX_RX_BURST          RTE_I40E_RXQ_REARM_THRESH
+#define RTE_I40E_TX_MAX_FREE_BUF_SZ    64
+#define RTE_I40E_DESCS_PER_LOOP    4
 
 #define I40E_RXBUF_SZ_1024 1024
 #define I40E_RXBUF_SZ_2048 2048
 
+#undef container_of
+#define container_of(ptr, type, member) ({ \
+		typeof(((type *)0)->member)(*__mptr) = (ptr); \
+		(type *)((char *)__mptr - offsetof(type, member)); })
+
+#define I40E_TD_CMD (I40E_TX_DESC_CMD_ICRC |\
+		     I40E_TX_DESC_CMD_EOP)
+
 enum i40e_header_split_mode {
 	i40e_header_split_none = 0,
 	i40e_header_split_enabled = 1,
@@ -100,6 +114,11 @@ struct i40e_rx_queue {
 	struct rte_mbuf fake_mbuf; /**< dummy mbuf */
 	struct rte_mbuf *rx_stage[RTE_PMD_I40E_RX_MAX_BURST * 2];
 #endif
+
+	uint16_t rxrearm_nb;	/**< number of remaining to be re-armed */
+	uint16_t rxrearm_start;	/**< the idx we start the re-arming from */
+	uint64_t mbuf_initializer; /**< value to init mbufs */
+
 	uint8_t port_id; /**< device port ID */
 	uint8_t crc_len; /**< 0 if CRC stripped, 4 otherwise */
 	uint16_t queue_id; /**< RX queue index */
@@ -210,4 +229,9 @@ uint32_t i40e_dev_rx_queue_count(struct rte_eth_dev *dev,
 				 uint16_t rx_queue_id);
 int i40e_dev_rx_descriptor_done(void *rx_queue, uint16_t offset);
 
+uint16_t i40e_recv_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts,
+			    uint16_t nb_pkts);
+int i40e_rxq_vec_setup(struct i40e_rx_queue *rxq);
+void i40e_rx_queue_release_mbufs_vec(struct i40e_rx_queue *rxq);
+
 #endif /* _I40E_RXTX_H_ */
diff --git a/drivers/net/i40e/i40e_rxtx_vec.c b/drivers/net/i40e/i40e_rxtx_vec.c
new file mode 100644
index 0000000..a95916b
--- /dev/null
+++ b/drivers/net/i40e/i40e_rxtx_vec.c
@@ -0,0 +1,484 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2015 Intel Corporation. All rights reserved.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdint.h>
+#include <rte_ethdev.h>
+#include <rte_malloc.h>
+
+#include "base/i40e_prototype.h"
+#include "base/i40e_type.h"
+#include "i40e_ethdev.h"
+#include "i40e_rxtx.h"
+
+#include <tmmintrin.h>
+
+#ifndef __INTEL_COMPILER
+#pragma GCC diagnostic ignored "-Wcast-qual"
+#endif
+
+static inline void
+i40e_rxq_rearm(struct i40e_rx_queue *rxq)
+{
+	int i;
+	uint16_t rx_id;
+
+	volatile union i40e_rx_desc *rxdp;
+	struct i40e_rx_entry *rxep = &rxq->sw_ring[rxq->rxrearm_start];
+	struct rte_mbuf *mb0, *mb1;
+	__m128i hdr_room = _mm_set_epi64x(RTE_PKTMBUF_HEADROOM,
+			RTE_PKTMBUF_HEADROOM);
+	__m128i dma_addr0, dma_addr1;
+
+	rxdp = rxq->rx_ring + rxq->rxrearm_start;
+
+	/* Pull 'n' more MBUFs into the software ring */
+	if (rte_mempool_get_bulk(rxq->mp,
+				 (void *)rxep,
+				 RTE_I40E_RXQ_REARM_THRESH) < 0) {
+		if (rxq->rxrearm_nb + RTE_I40E_RXQ_REARM_THRESH >=
+		    rxq->nb_rx_desc) {
+			dma_addr0 = _mm_setzero_si128();
+			for (i = 0; i < RTE_I40E_DESCS_PER_LOOP; i++) {
+				rxep[i].mbuf = &rxq->fake_mbuf;
+				_mm_store_si128((__m128i *)&rxdp[i].read,
+						dma_addr0);
+			}
+		}
+		rte_eth_devices[rxq->port_id].data->rx_mbuf_alloc_failed +=
+			RTE_I40E_RXQ_REARM_THRESH;
+		return;
+	}
+
+	/* Initialize the mbufs in vector, process 2 mbufs in one loop */
+	for (i = 0; i < RTE_I40E_RXQ_REARM_THRESH; i += 2, rxep += 2) {
+		__m128i vaddr0, vaddr1;
+		uintptr_t p0, p1;
+
+		mb0 = rxep[0].mbuf;
+		mb1 = rxep[1].mbuf;
+
+		 /* Flush mbuf with pkt template.
+		 * Data to be rearmed is 6 bytes long.
+		 * Though, RX will overwrite ol_flags that are coming next
+		 * anyway. So overwrite whole 8 bytes with one load:
+		 * 6 bytes of rearm_data plus first 2 bytes of ol_flags.
+		 */
+		p0 = (uintptr_t)&mb0->rearm_data;
+		*(uint64_t *)p0 = rxq->mbuf_initializer;
+		p1 = (uintptr_t)&mb1->rearm_data;
+		*(uint64_t *)p1 = rxq->mbuf_initializer;
+
+		/* load buf_addr(lo 64bit) and buf_physaddr(hi 64bit) */
+		vaddr0 = _mm_loadu_si128((__m128i *)&mb0->buf_addr);
+		vaddr1 = _mm_loadu_si128((__m128i *)&mb1->buf_addr);
+
+		/* convert pa to dma_addr hdr/data */
+		dma_addr0 = _mm_unpackhi_epi64(vaddr0, vaddr0);
+		dma_addr1 = _mm_unpackhi_epi64(vaddr1, vaddr1);
+
+		/* add headroom to pa values */
+		dma_addr0 = _mm_add_epi64(dma_addr0, hdr_room);
+		dma_addr1 = _mm_add_epi64(dma_addr1, hdr_room);
+
+		/* flush desc with pa dma_addr */
+		_mm_store_si128((__m128i *)&rxdp++->read, dma_addr0);
+		_mm_store_si128((__m128i *)&rxdp++->read, dma_addr1);
+	}
+
+	rxq->rxrearm_start += RTE_I40E_RXQ_REARM_THRESH;
+	if (rxq->rxrearm_start >= rxq->nb_rx_desc)
+		rxq->rxrearm_start = 0;
+
+	rxq->rxrearm_nb -= RTE_I40E_RXQ_REARM_THRESH;
+
+	rx_id = (uint16_t)((rxq->rxrearm_start == 0) ?
+			     (rxq->nb_rx_desc - 1) : (rxq->rxrearm_start - 1));
+
+	/* Update the tail pointer on the NIC */
+	I40E_PCI_REG_WRITE(rxq->qrx_tail, rx_id);
+}
+
+/* Handling the offload flags (olflags) field takes computation
+ * time when receiving packets. Therefore we provide a flag to disable
+ * the processing of the olflags field when they are not needed. This
+ * gives improved performance, at the cost of losing the offload info
+ * in the received packet
+ */
+#ifdef RTE_LIBRTE_I40E_RX_OLFLAGS_ENABLE
+
+static inline void
+desc_to_olflags_v(__m128i descs[4], struct rte_mbuf **rx_pkts)
+{
+	__m128i vlan0, vlan1, rss;
+	union {
+		uint16_t e[4];
+		uint64_t dword;
+	} vol;
+
+	/* mask everything except rss and vlan flags
+	*bit2 is for vlan tag, bits 13:12 for rss
+	*/
+	const __m128i rss_vlan_msk = _mm_set_epi16(
+			0x0000, 0x0000, 0x0000, 0x0000,
+			0x3004, 0x3004, 0x3004, 0x3004);
+
+	/* map rss and vlan type to rss hash and vlan flag */
+	const __m128i vlan_flags = _mm_set_epi8(0, 0, 0, 0,
+			0, 0, 0, 0,
+			0, 0, 0, PKT_RX_VLAN_PKT,
+			0, 0, 0, 0);
+
+	const __m128i rss_flags = _mm_set_epi8(0, 0, 0, 0,
+			0, 0, 0, 0,
+			0, 0, 0, 0,
+			PKT_RX_FDIR, 0, PKT_RX_RSS_HASH, 0);
+
+	vlan0 = _mm_unpackhi_epi16(descs[0], descs[1]);
+	vlan1 = _mm_unpackhi_epi16(descs[2], descs[3]);
+	vlan0 = _mm_unpacklo_epi32(vlan0, vlan1);
+
+	vlan1 = _mm_and_si128(vlan0, rss_vlan_msk);
+	vlan0 = _mm_shuffle_epi8(vlan_flags, vlan1);
+
+	rss = _mm_srli_epi16(vlan1, 12);
+	rss = _mm_shuffle_epi8(rss_flags, rss);
+
+	vlan0 = _mm_or_si128(vlan0, rss);
+	vol.dword = _mm_cvtsi128_si64(vlan0);
+
+	rx_pkts[0]->ol_flags = vol.e[0];
+	rx_pkts[1]->ol_flags = vol.e[1];
+	rx_pkts[2]->ol_flags = vol.e[2];
+	rx_pkts[3]->ol_flags = vol.e[3];
+}
+#else
+#define desc_to_olflags_v(desc, rx_pkts) do {} while (0)
+#endif
+
+#define PKTLEN_SHIFT     (6)
+#define PKTLEN_MASK      (0x3FFF)
+/* Handling the pkt len field is not aligned with 1byte, so shift is
+ * needed to let it align
+ */
+static inline void
+desc_pktlen_align(__m128i descs[4])
+{
+	__m128i pktlen0, pktlen1, zero;
+	union {
+		uint16_t e[4];
+		uint64_t dword;
+	} vol;
+
+	/* mask everything except pktlen field*/
+	const __m128i pktlen_msk = _mm_set_epi32(PKTLEN_MASK, PKTLEN_MASK,
+						PKTLEN_MASK, PKTLEN_MASK);
+
+	pktlen0 = _mm_unpackhi_epi32(descs[0], descs[2]);
+	pktlen1 = _mm_unpackhi_epi32(descs[1], descs[3]);
+	pktlen0 = _mm_unpackhi_epi32(pktlen0, pktlen1);
+
+	zero = _mm_xor_si128(pktlen0, pktlen0);
+
+	pktlen0 = _mm_srli_epi32(pktlen0, PKTLEN_SHIFT);
+	pktlen0 = _mm_and_si128(pktlen0, pktlen_msk);
+
+	pktlen0 = _mm_packs_epi32(pktlen0, zero);
+	vol.dword = _mm_cvtsi128_si64(pktlen0);
+	/* let the descriptor byte 15-14 store the pkt len */
+	*((uint16_t *)&descs[0]+7) = vol.e[0];
+	*((uint16_t *)&descs[1]+7) = vol.e[1];
+	*((uint16_t *)&descs[2]+7) = vol.e[2];
+	*((uint16_t *)&descs[3]+7) = vol.e[3];
+}
+
+ /* vPMD receive routine, now only accept (nb_pkts == RTE_I40E_VPMD_RX_BURST)
+ * in one loop
+ *
+ * Notice:
+ * - nb_pkts < RTE_I40E_DESCS_PER_LOOP, just return no packet
+ * - nb_pkts > RTE_I40E_VPMD_RX_BURST, only scan RTE_I40E_VPMD_RX_BURST
+ *   numbers of DD bits
+
+ */
+static inline uint16_t
+_recv_raw_pkts_vec(struct i40e_rx_queue *rxq, struct rte_mbuf **rx_pkts,
+		   uint16_t nb_pkts, uint8_t *split_packet)
+{
+	volatile union i40e_rx_desc *rxdp;
+	struct i40e_rx_entry *sw_ring;
+	uint16_t nb_pkts_recd;
+	int pos;
+	uint64_t var;
+	__m128i shuf_msk;
+
+	__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 */
+			);
+	__m128i dd_check, eop_check;
+
+	/* nb_pkts shall be less equal than RTE_I40E_MAX_RX_BURST */
+	nb_pkts = RTE_MIN(nb_pkts, RTE_I40E_MAX_RX_BURST);
+
+	/* nb_pkts has to be floor-aligned to RTE_I40E_DESCS_PER_LOOP */
+	nb_pkts = RTE_ALIGN_FLOOR(nb_pkts, RTE_I40E_DESCS_PER_LOOP);
+
+	/* Just the act of getting into the function from the application is
+	 * going to cost about 7 cycles
+	 */
+	rxdp = rxq->rx_ring + rxq->rx_tail;
+
+	_mm_prefetch((const void *)rxdp, _MM_HINT_T0);
+
+	/* See if we need to rearm the RX queue - gives the prefetch a bit
+	 * of time to act
+	 */
+	if (rxq->rxrearm_nb > RTE_I40E_RXQ_REARM_THRESH)
+		i40e_rxq_rearm(rxq);
+
+	/* Before we start moving massive data around, check to see if
+	 * there is actually a packet available
+	 */
+	if (!(rxdp->wb.qword1.status_error_len &
+			rte_cpu_to_le_32(1 << I40E_RX_DESC_STATUS_DD_SHIFT)))
+		return 0;
+
+	/* 4 packets DD mask */
+	dd_check = _mm_set_epi64x(0x0000000100000001LL, 0x0000000100000001LL);
+
+	/* 4 packets EOP mask */
+	eop_check = _mm_set_epi64x(0x0000000200000002LL, 0x0000000200000002LL);
+
+	/* mask to shuffle from desc. to mbuf */
+	shuf_msk = _mm_set_epi8(
+		7, 6, 5, 4,  /* octet 4~7, 32bits rss */
+		3, 2,        /* octet 2~3, low 16 bits vlan_macip */
+		15, 14,      /* octet 15~14, 16 bits data_len */
+		0xFF, 0xFF,  /* skip high 16 bits pkt_len, zero out */
+		15, 14,      /* octet 15~14, low 16 bits pkt_len */
+		0xFF, 0xFF,  /* pkt_type set as unknown */
+		0xFF, 0xFF  /*pkt_type set as unknown */
+		);
+
+	/* 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 < RTE_I40E_VPMD_RX_BURST;
+			pos += RTE_I40E_DESCS_PER_LOOP,
+			rxdp += RTE_I40E_DESCS_PER_LOOP) {
+		__m128i descs[RTE_I40E_DESCS_PER_LOOP];
+		__m128i pkt_mb1, pkt_mb2, pkt_mb3, pkt_mb4;
+		__m128i zero, staterr, sterr_tmp1, sterr_tmp2;
+		__m128i mbp1, mbp2; /* two mbuf pointer in one XMM reg. */
+
+		/* B.1 load 1 mbuf point */
+		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));
+
+		/* B.2 copy 2 mbuf point into rx_pkts  */
+		_mm_storeu_si128((__m128i *)&rx_pkts[pos], mbp1);
+
+		/* B.1 load 1 mbuf point */
+		mbp2 = _mm_loadu_si128((__m128i *)&sw_ring[pos+2]);
+
+		descs[2] = _mm_loadu_si128((__m128i *)(rxdp + 2));
+		/* B.1 load 2 mbuf point */
+		descs[1] = _mm_loadu_si128((__m128i *)(rxdp + 1));
+		descs[0] = _mm_loadu_si128((__m128i *)(rxdp));
+
+		/* B.2 copy 2 mbuf point into rx_pkts  */
+		_mm_storeu_si128((__m128i *)&rx_pkts[pos+2], mbp2);
+
+		if (split_packet) {
+			rte_prefetch0(&rx_pkts[pos]->cacheline1);
+			rte_prefetch0(&rx_pkts[pos + 1]->cacheline1);
+			rte_prefetch0(&rx_pkts[pos + 2]->cacheline1);
+			rte_prefetch0(&rx_pkts[pos + 3]->cacheline1);
+		}
+
+		/*shift the pktlen field*/
+		desc_pktlen_align(descs);
+
+		/* 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]);
+
+		desc_to_olflags_v(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  */
+		zero = _mm_xor_si128(dd_check, dd_check);
+		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) {
+			__m128i eop_shuf_mask = _mm_set_epi8(
+					0xFF, 0xFF, 0xFF, 0xFF,
+					0xFF, 0xFF, 0xFF, 0xFF,
+					0xFF, 0xFF, 0xFF, 0xFF,
+					0x04, 0x0C, 0x00, 0x08
+					);
+
+			/* 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 += RTE_I40E_DESCS_PER_LOOP;
+
+			/* zero-out next pointers */
+			rx_pkts[pos]->next = NULL;
+			rx_pkts[pos + 1]->next = NULL;
+			rx_pkts[pos + 2]->next = NULL;
+			rx_pkts[pos + 3]->next = NULL;
+		}
+
+		/* 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);
+		/* C.4 calc avaialbe number of desc */
+		var = __builtin_popcountll(_mm_cvtsi128_si64(staterr));
+		nb_pkts_recd += var;
+		if (likely(var != RTE_I40E_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;
+}
+
+ /* vPMD receive routine, now only accept (nb_pkts == RTE_IXGBE_VPMD_RX_BURST)
+ * in one loop
+ *
+ * Notice:
+ * - nb_pkts < RTE_I40E_VPMD_RX_BURST, just return no packet
+ * - nb_pkts > RTE_I40E_VPMD_RX_BURST, only scan RTE_IXGBE_VPMD_RX_BURST
+ *   numbers of DD bit
+ */
+uint16_t
+i40e_recv_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts,
+		   uint16_t nb_pkts)
+{
+	return _recv_raw_pkts_vec(rx_queue, rx_pkts, nb_pkts, NULL);
+}
+
+void __attribute__((cold))
+i40e_rx_queue_release_mbufs_vec(struct i40e_rx_queue *rxq)
+{
+	const unsigned mask = rxq->nb_rx_desc - 1;
+	unsigned i;
+
+	if (rxq->sw_ring == NULL || rxq->rxrearm_nb >= rxq->nb_rx_desc)
+		return;
+
+	/* free all mbufs that are valid in the ring */
+	for (i = rxq->rx_tail; i != rxq->rxrearm_start; i = (i + 1) & mask)
+		rte_pktmbuf_free_seg(rxq->sw_ring[i].mbuf);
+	rxq->rxrearm_nb = rxq->nb_rx_desc;
+
+	/* set all entries to NULL */
+	memset(rxq->sw_ring, 0, sizeof(rxq->sw_ring[0]) * rxq->nb_rx_desc);
+}
+
+int __attribute__((cold))
+i40e_rxq_vec_setup(struct i40e_rx_queue *rxq)
+{
+	uintptr_t p;
+	struct rte_mbuf mb_def = { .buf_addr = 0 }; /* zeroed mbuf */
+
+	mb_def.nb_segs = 1;
+	mb_def.data_off = RTE_PKTMBUF_HEADROOM;
+	mb_def.port = rxq->port_id;
+	rte_mbuf_refcnt_set(&mb_def, 1);
+
+	/* prevent compiler reordering: rearm_data covers previous fields */
+	rte_compiler_barrier();
+	p = (uintptr_t)&mb_def.rearm_data;
+	rxq->mbuf_initializer = *(uint64_t *)p;
+	return 0;
+}
-- 
1.9.3



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