[dpdk-dev] [PATCH 19/44] net/cnxk: add Rx vector version for cn10k

[Nithin Dabilpuram <ndabilpuram@marvell.com>]

From: Jerin Jacob <jerinj@marvell.com>

Add Rx burst vector version for CN10K.

Signed-off-by: Jerin Jacob <jerinj@marvell.com>
Signed-off-by: Nithin Dabilpuram <ndabilpuram@marvell.com>
---
 doc/guides/nics/cnxk.rst    |   1 +
 drivers/net/cnxk/cn10k_rx.c | 240 +++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 240 insertions(+), 1 deletion(-)

diff --git a/doc/guides/nics/cnxk.rst b/doc/guides/nics/cnxk.rst
index 789ec29..4187e9d 100644
--- a/doc/guides/nics/cnxk.rst
+++ b/doc/guides/nics/cnxk.rst
@@ -24,6 +24,7 @@ Features of the CNXK Ethdev PMD are:
 - Receiver Side Scaling (RSS)
 - Link state information
 - Scatter-Gather IO support
+- Vector Poll mode driver
 
 Prerequisites
 -------------
diff --git a/drivers/net/cnxk/cn10k_rx.c b/drivers/net/cnxk/cn10k_rx.c
index b98e7a1..2bc952d 100644
--- a/drivers/net/cnxk/cn10k_rx.c
+++ b/drivers/net/cnxk/cn10k_rx.c
@@ -2,6 +2,8 @@
  * Copyright(C) 2021 Marvell.
  */
 
+#include <rte_vect.h>
+
 #include "cn10k_ethdev.h"
 #include "cn10k_rx.h"
 
@@ -83,6 +85,223 @@ nix_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t pkts,
 	return nb_pkts;
 }
 
+#if defined(RTE_ARCH_ARM64)
+
+static __rte_always_inline uint16_t
+nix_recv_pkts_vector(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t pkts,
+		     const uint16_t flags)
+{
+	struct cn10k_eth_rxq *rxq = rx_queue;
+	uint16_t packets = 0;
+	uint64x2_t cq0_w8, cq1_w8, cq2_w8, cq3_w8, mbuf01, mbuf23;
+	const uint64_t mbuf_initializer = rxq->mbuf_initializer;
+	const uint64x2_t data_off = vdupq_n_u64(rxq->data_off);
+	uint64_t ol_flags0, ol_flags1, ol_flags2, ol_flags3;
+	uint64x2_t rearm0 = vdupq_n_u64(mbuf_initializer);
+	uint64x2_t rearm1 = vdupq_n_u64(mbuf_initializer);
+	uint64x2_t rearm2 = vdupq_n_u64(mbuf_initializer);
+	uint64x2_t rearm3 = vdupq_n_u64(mbuf_initializer);
+	struct rte_mbuf *mbuf0, *mbuf1, *mbuf2, *mbuf3;
+	const uint16_t *lookup_mem = rxq->lookup_mem;
+	const uint32_t qmask = rxq->qmask;
+	const uint64_t wdata = rxq->wdata;
+	const uintptr_t desc = rxq->desc;
+	uint8x16_t f0, f1, f2, f3;
+	uint32_t head = rxq->head;
+	uint16_t pkts_left;
+
+	pkts = nix_rx_nb_pkts(rxq, wdata, pkts, qmask);
+	pkts_left = pkts & (NIX_DESCS_PER_LOOP - 1);
+
+	/* Packets has to be floor-aligned to NIX_DESCS_PER_LOOP */
+	pkts = RTE_ALIGN_FLOOR(pkts, NIX_DESCS_PER_LOOP);
+
+	while (packets < pkts) {
+		/* Exit loop if head is about to wrap and become unaligned */
+		if (((head + NIX_DESCS_PER_LOOP - 1) & qmask) <
+		    NIX_DESCS_PER_LOOP) {
+			pkts_left += (pkts - packets);
+			break;
+		}
+
+		const uintptr_t cq0 = desc + CQE_SZ(head);
+
+		/* Prefetch N desc ahead */
+		rte_prefetch_non_temporal((void *)(cq0 + CQE_SZ(8)));
+		rte_prefetch_non_temporal((void *)(cq0 + CQE_SZ(9)));
+		rte_prefetch_non_temporal((void *)(cq0 + CQE_SZ(10)));
+		rte_prefetch_non_temporal((void *)(cq0 + CQE_SZ(11)));
+
+		/* Get NIX_RX_SG_S for size and buffer pointer */
+		cq0_w8 = vld1q_u64((uint64_t *)(cq0 + CQE_SZ(0) + 64));
+		cq1_w8 = vld1q_u64((uint64_t *)(cq0 + CQE_SZ(1) + 64));
+		cq2_w8 = vld1q_u64((uint64_t *)(cq0 + CQE_SZ(2) + 64));
+		cq3_w8 = vld1q_u64((uint64_t *)(cq0 + CQE_SZ(3) + 64));
+
+		/* Extract mbuf from NIX_RX_SG_S */
+		mbuf01 = vzip2q_u64(cq0_w8, cq1_w8);
+		mbuf23 = vzip2q_u64(cq2_w8, cq3_w8);
+		mbuf01 = vqsubq_u64(mbuf01, data_off);
+		mbuf23 = vqsubq_u64(mbuf23, data_off);
+
+		/* Move mbufs to scalar registers for future use */
+		mbuf0 = (struct rte_mbuf *)vgetq_lane_u64(mbuf01, 0);
+		mbuf1 = (struct rte_mbuf *)vgetq_lane_u64(mbuf01, 1);
+		mbuf2 = (struct rte_mbuf *)vgetq_lane_u64(mbuf23, 0);
+		mbuf3 = (struct rte_mbuf *)vgetq_lane_u64(mbuf23, 1);
+
+		/* Mask to get packet len from NIX_RX_SG_S */
+		const uint8x16_t shuf_msk = {
+			0xFF, 0xFF, /* pkt_type set as unknown */
+			0xFF, 0xFF, /* pkt_type set as unknown */
+			0,    1,    /* octet 1~0, low 16 bits pkt_len */
+			0xFF, 0xFF, /* skip high 16 bits pkt_len, zero out */
+			0,    1,    /* octet 1~0, 16 bits data_len */
+			0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
+
+		/* Form the rx_descriptor_fields1 with pkt_len and data_len */
+		f0 = vqtbl1q_u8(cq0_w8, shuf_msk);
+		f1 = vqtbl1q_u8(cq1_w8, shuf_msk);
+		f2 = vqtbl1q_u8(cq2_w8, shuf_msk);
+		f3 = vqtbl1q_u8(cq3_w8, shuf_msk);
+
+		/* Load CQE word0 and word 1 */
+		uint64_t cq0_w0 = ((uint64_t *)(cq0 + CQE_SZ(0)))[0];
+		uint64_t cq0_w1 = ((uint64_t *)(cq0 + CQE_SZ(0)))[1];
+		uint64_t cq1_w0 = ((uint64_t *)(cq0 + CQE_SZ(1)))[0];
+		uint64_t cq1_w1 = ((uint64_t *)(cq0 + CQE_SZ(1)))[1];
+		uint64_t cq2_w0 = ((uint64_t *)(cq0 + CQE_SZ(2)))[0];
+		uint64_t cq2_w1 = ((uint64_t *)(cq0 + CQE_SZ(2)))[1];
+		uint64_t cq3_w0 = ((uint64_t *)(cq0 + CQE_SZ(3)))[0];
+		uint64_t cq3_w1 = ((uint64_t *)(cq0 + CQE_SZ(3)))[1];
+
+		if (flags & NIX_RX_OFFLOAD_RSS_F) {
+			/* Fill rss in the rx_descriptor_fields1 */
+			f0 = vsetq_lane_u32(cq0_w0, f0, 3);
+			f1 = vsetq_lane_u32(cq1_w0, f1, 3);
+			f2 = vsetq_lane_u32(cq2_w0, f2, 3);
+			f3 = vsetq_lane_u32(cq3_w0, f3, 3);
+			ol_flags0 = PKT_RX_RSS_HASH;
+			ol_flags1 = PKT_RX_RSS_HASH;
+			ol_flags2 = PKT_RX_RSS_HASH;
+			ol_flags3 = PKT_RX_RSS_HASH;
+		} else {
+			ol_flags0 = 0;
+			ol_flags1 = 0;
+			ol_flags2 = 0;
+			ol_flags3 = 0;
+		}
+
+		if (flags & NIX_RX_OFFLOAD_PTYPE_F) {
+			/* Fill packet_type in the rx_descriptor_fields1 */
+			f0 = vsetq_lane_u32(nix_ptype_get(lookup_mem, cq0_w1),
+					    f0, 0);
+			f1 = vsetq_lane_u32(nix_ptype_get(lookup_mem, cq1_w1),
+					    f1, 0);
+			f2 = vsetq_lane_u32(nix_ptype_get(lookup_mem, cq2_w1),
+					    f2, 0);
+			f3 = vsetq_lane_u32(nix_ptype_get(lookup_mem, cq3_w1),
+					    f3, 0);
+		}
+
+		if (flags & NIX_RX_OFFLOAD_CHECKSUM_F) {
+			ol_flags0 |= nix_rx_olflags_get(lookup_mem, cq0_w1);
+			ol_flags1 |= nix_rx_olflags_get(lookup_mem, cq1_w1);
+			ol_flags2 |= nix_rx_olflags_get(lookup_mem, cq2_w1);
+			ol_flags3 |= nix_rx_olflags_get(lookup_mem, cq3_w1);
+		}
+
+		if (flags & NIX_RX_OFFLOAD_MARK_UPDATE_F) {
+			ol_flags0 = nix_update_match_id(
+				*(uint16_t *)(cq0 + CQE_SZ(0) + 38), ol_flags0,
+				mbuf0);
+			ol_flags1 = nix_update_match_id(
+				*(uint16_t *)(cq0 + CQE_SZ(1) + 38), ol_flags1,
+				mbuf1);
+			ol_flags2 = nix_update_match_id(
+				*(uint16_t *)(cq0 + CQE_SZ(2) + 38), ol_flags2,
+				mbuf2);
+			ol_flags3 = nix_update_match_id(
+				*(uint16_t *)(cq0 + CQE_SZ(3) + 38), ol_flags3,
+				mbuf3);
+		}
+
+		/* Form rearm_data with ol_flags */
+		rearm0 = vsetq_lane_u64(ol_flags0, rearm0, 1);
+		rearm1 = vsetq_lane_u64(ol_flags1, rearm1, 1);
+		rearm2 = vsetq_lane_u64(ol_flags2, rearm2, 1);
+		rearm3 = vsetq_lane_u64(ol_flags3, rearm3, 1);
+
+		/* Update rx_descriptor_fields1 */
+		vst1q_u64((uint64_t *)mbuf0->rx_descriptor_fields1, f0);
+		vst1q_u64((uint64_t *)mbuf1->rx_descriptor_fields1, f1);
+		vst1q_u64((uint64_t *)mbuf2->rx_descriptor_fields1, f2);
+		vst1q_u64((uint64_t *)mbuf3->rx_descriptor_fields1, f3);
+
+		/* Update rearm_data */
+		vst1q_u64((uint64_t *)mbuf0->rearm_data, rearm0);
+		vst1q_u64((uint64_t *)mbuf1->rearm_data, rearm1);
+		vst1q_u64((uint64_t *)mbuf2->rearm_data, rearm2);
+		vst1q_u64((uint64_t *)mbuf3->rearm_data, rearm3);
+
+		/* Update that no more segments */
+		mbuf0->next = NULL;
+		mbuf1->next = NULL;
+		mbuf2->next = NULL;
+		mbuf3->next = NULL;
+
+		/* Store the mbufs to rx_pkts */
+		vst1q_u64((uint64_t *)&rx_pkts[packets], mbuf01);
+		vst1q_u64((uint64_t *)&rx_pkts[packets + 2], mbuf23);
+
+		/* Prefetch mbufs */
+		roc_prefetch_store_keep(mbuf0);
+		roc_prefetch_store_keep(mbuf1);
+		roc_prefetch_store_keep(mbuf2);
+		roc_prefetch_store_keep(mbuf3);
+
+		/* Mark mempool obj as "get" as it is alloc'ed by NIX */
+		__mempool_check_cookies(mbuf0->pool, (void **)&mbuf0, 1, 1);
+		__mempool_check_cookies(mbuf1->pool, (void **)&mbuf1, 1, 1);
+		__mempool_check_cookies(mbuf2->pool, (void **)&mbuf2, 1, 1);
+		__mempool_check_cookies(mbuf3->pool, (void **)&mbuf3, 1, 1);
+
+		/* Advance head pointer and packets */
+		head += NIX_DESCS_PER_LOOP;
+		head &= qmask;
+		packets += NIX_DESCS_PER_LOOP;
+	}
+
+	rxq->head = head;
+	rxq->available -= packets;
+
+	rte_io_wmb();
+	/* Free all the CQs that we've processed */
+	plt_write64((rxq->wdata | packets), rxq->cq_door);
+
+	if (unlikely(pkts_left))
+		packets += nix_recv_pkts(rx_queue, &rx_pkts[packets], pkts_left,
+					 flags);
+
+	return packets;
+}
+
+#else
+
+static inline uint16_t
+nix_recv_pkts_vector(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t pkts,
+		     const uint16_t flags)
+{
+	RTE_SET_USED(rx_queue);
+	RTE_SET_USED(rx_pkts);
+	RTE_SET_USED(pkts);
+	RTE_SET_USED(flags);
+
+	return 0;
+}
+
+#endif
+
 #define R(name, f3, f2, f1, f0, flags)					       \
 	static uint16_t __rte_noinline __rte_hot cn10k_nix_recv_pkts_##name(   \
 		void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t pkts)      \
@@ -97,6 +316,14 @@ nix_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t pkts,
 	{                                                                      \
 		return nix_recv_pkts(rx_queue, rx_pkts, pkts,                  \
 				     (flags) | NIX_RX_MULTI_SEG_F);            \
+	}                                                                      \
+									       \
+	static uint16_t __rte_noinline __rte_hot                               \
+		cn10k_nix_recv_pkts_vec_##name(void *rx_queue,                 \
+					       struct rte_mbuf **rx_pkts,      \
+					       uint16_t pkts)                  \
+	{                                                                      \
+		return nix_recv_pkts_vector(rx_queue, rx_pkts, pkts, (flags)); \
 	}
 
 NIX_RX_FASTPATH_MODES
@@ -137,7 +364,18 @@ cn10k_eth_set_rx_function(struct rte_eth_dev *eth_dev)
 #undef R
 	};
 
-	pick_rx_func(eth_dev, nix_eth_rx_burst);
+	const eth_rx_burst_t nix_eth_rx_vec_burst[2][2][2][2] = {
+#define R(name, f3, f2, f1, f0, flags)					      \
+	[f3][f2][f1][f0] = cn10k_nix_recv_pkts_vec_##name,
+
+		NIX_RX_FASTPATH_MODES
+#undef R
+	};
+
+	if (dev->scalar_ena)
+		pick_rx_func(eth_dev, nix_eth_rx_burst);
+	else
+		pick_rx_func(eth_dev, nix_eth_rx_vec_burst);
 
 	if (dev->rx_offloads & DEV_RX_OFFLOAD_SCATTER)
 		pick_rx_func(eth_dev, nix_eth_rx_burst_mseg);
-- 
2.8.4