numam-dpdk/drivers/net/ixgbe/ixgbe_rxtx_vec_neon.c

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2010-2015 Intel Corporation
 */

#include <stdint.h>
#include <rte_ethdev_driver.h>
#include <rte_malloc.h>

#include "ixgbe_ethdev.h"
#include "ixgbe_rxtx.h"
#include "ixgbe_rxtx_vec_common.h"

#include <arm_neon.h>

#pragma GCC diagnostic ignored "-Wcast-qual"

static inline void
ixgbe_rxq_rearm(struct ixgbe_rx_queue *rxq)
{
	int i;
	uint16_t rx_id;
	volatile union ixgbe_adv_rx_desc *rxdp;
	struct ixgbe_rx_entry *rxep = &rxq->sw_ring[rxq->rxrearm_start];
	struct rte_mbuf *mb0, *mb1;
	uint64x2_t dma_addr0, dma_addr1;
	uint64x2_t zero = vdupq_n_u64(0);
	uint64_t paddr;
	uint8x8_t p;

	rxdp = rxq->rx_ring + rxq->rxrearm_start;

	/* Pull 'n' more MBUFs into the software ring */
	if (unlikely(rte_mempool_get_bulk(rxq->mb_pool,
					  (void *)rxep,
					  RTE_IXGBE_RXQ_REARM_THRESH) < 0)) {
		if (rxq->rxrearm_nb + RTE_IXGBE_RXQ_REARM_THRESH >=
		    rxq->nb_rx_desc) {
			for (i = 0; i < RTE_IXGBE_DESCS_PER_LOOP; i++) {
				rxep[i].mbuf = &rxq->fake_mbuf;
				vst1q_u64((uint64_t *)&rxdp[i].read,
					  zero);
			}
		}
		rte_eth_devices[rxq->port_id].data->rx_mbuf_alloc_failed +=
			RTE_IXGBE_RXQ_REARM_THRESH;
		return;
	}

	p = vld1_u8((uint8_t *)&rxq->mbuf_initializer);

	/* Initialize the mbufs in vector, process 2 mbufs in one loop */
	for (i = 0; i < RTE_IXGBE_RXQ_REARM_THRESH; i += 2, rxep += 2) {
		mb0 = rxep[0].mbuf;
		mb1 = rxep[1].mbuf;

		/*
		 * Flush mbuf with pkt template.
		 * Data to be rearmed is 6 bytes long.
		 */
		vst1_u8((uint8_t *)&mb0->rearm_data, p);
		paddr = mb0->buf_iova + RTE_PKTMBUF_HEADROOM;
		dma_addr0 = vsetq_lane_u64(paddr, zero, 0);
		/* flush desc with pa dma_addr */
		vst1q_u64((uint64_t *)&rxdp++->read, dma_addr0);

		vst1_u8((uint8_t *)&mb1->rearm_data, p);
		paddr = mb1->buf_iova + RTE_PKTMBUF_HEADROOM;
		dma_addr1 = vsetq_lane_u64(paddr, zero, 0);
		vst1q_u64((uint64_t *)&rxdp++->read, dma_addr1);
	}

	rxq->rxrearm_start += RTE_IXGBE_RXQ_REARM_THRESH;
	if (rxq->rxrearm_start >= rxq->nb_rx_desc)
		rxq->rxrearm_start = 0;

	rxq->rxrearm_nb -= RTE_IXGBE_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 */
	IXGBE_PCI_REG_WRITE(rxq->rdt_reg_addr, rx_id);
}

#define VTAG_SHIFT     (3)

static inline void
desc_to_olflags_v(uint8x16x2_t sterr_tmp1, uint8x16x2_t sterr_tmp2,
		  uint8x16_t staterr, struct rte_mbuf **rx_pkts)
{
	uint8x16_t ptype;
	uint8x16_t vtag;

	union {
		uint8_t e[4];
		uint32_t word;
	} vol;

	const uint8x16_t pkttype_msk = {
			PKT_RX_VLAN, PKT_RX_VLAN,
			PKT_RX_VLAN, PKT_RX_VLAN,
			0x00, 0x00, 0x00, 0x00,
			0x00, 0x00, 0x00, 0x00,
			0x00, 0x00, 0x00, 0x00};

	const uint8x16_t rsstype_msk = {
			0x0F, 0x0F, 0x0F, 0x0F,
			0x00, 0x00, 0x00, 0x00,
			0x00, 0x00, 0x00, 0x00,
			0x00, 0x00, 0x00, 0x00};

	const uint8x16_t rss_flags = {
			0, PKT_RX_RSS_HASH, PKT_RX_RSS_HASH, PKT_RX_RSS_HASH,
			0, PKT_RX_RSS_HASH, 0, PKT_RX_RSS_HASH,
			PKT_RX_RSS_HASH, 0, 0, 0,
			0, 0, 0, PKT_RX_FDIR};

	ptype = vzipq_u8(sterr_tmp1.val[0], sterr_tmp2.val[0]).val[0];
	ptype = vandq_u8(ptype, rsstype_msk);
	ptype = vqtbl1q_u8(rss_flags, ptype);

	vtag = vshrq_n_u8(staterr, VTAG_SHIFT);
	vtag = vandq_u8(vtag, pkttype_msk);
	vtag = vorrq_u8(ptype, vtag);

	vol.word = vgetq_lane_u32(vreinterpretq_u32_u8(vtag), 0);

	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];
}

/*
 * vPMD raw receive routine, only accept(nb_pkts >= RTE_IXGBE_DESCS_PER_LOOP)
 *
 * Notice:
 * - nb_pkts < RTE_IXGBE_DESCS_PER_LOOP, just return no packet
 * - nb_pkts > RTE_IXGBE_MAX_RX_BURST, only scan RTE_IXGBE_MAX_RX_BURST
 *   numbers of DD bit
 * - floor align nb_pkts to a RTE_IXGBE_DESC_PER_LOOP power-of-two
 * - don't support ol_flags for rss and csum err
 */

#define IXGBE_VPMD_DESC_DD_MASK		0x01010101
#define IXGBE_VPMD_DESC_EOP_MASK	0x02020202

static inline uint16_t
_recv_raw_pkts_vec(struct ixgbe_rx_queue *rxq, struct rte_mbuf **rx_pkts,
		   uint16_t nb_pkts, uint8_t *split_packet)
{
	volatile union ixgbe_adv_rx_desc *rxdp;
	struct ixgbe_rx_entry *sw_ring;
	uint16_t nb_pkts_recd;
	int pos;
	uint8x16_t shuf_msk = {
		0xFF, 0xFF,
		0xFF, 0xFF,  /* skip 32 bits pkt_type */
		12, 13,      /* octet 12~13, low 16 bits pkt_len */
		0xFF, 0xFF,  /* skip high 16 bits pkt_len, zero out */
		12, 13,      /* octet 12~13, 16 bits data_len */
		14, 15,      /* octet 14~15, low 16 bits vlan_macip */
		4, 5, 6, 7  /* octet 4~7, 32bits rss */
		};
	uint16x8_t crc_adjust = {0, 0, rxq->crc_len, 0,
				 rxq->crc_len, 0, 0, 0};

	/* nb_pkts shall be less equal than RTE_IXGBE_MAX_RX_BURST */
	nb_pkts = RTE_MIN(nb_pkts, RTE_IXGBE_MAX_RX_BURST);

	/* nb_pkts has to be floor-aligned to RTE_IXGBE_DESCS_PER_LOOP */
	nb_pkts = RTE_ALIGN_FLOOR(nb_pkts, RTE_IXGBE_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;

	rte_prefetch_non_temporal(rxdp);

	/* See if we need to rearm the RX queue - gives the prefetch a bit
	 * of time to act
	 */
	if (rxq->rxrearm_nb > RTE_IXGBE_RXQ_REARM_THRESH)
		ixgbe_rxq_rearm(rxq);

	/* Before we start moving massive data around, check to see if
	 * there is actually a packet available
	 */
	if (!(rxdp->wb.upper.status_error &
				rte_cpu_to_le_32(IXGBE_RXDADV_STAT_DD)))
		return 0;

	/* 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
	 * 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 += RTE_IXGBE_DESCS_PER_LOOP,
			rxdp += RTE_IXGBE_DESCS_PER_LOOP) {
		uint64x2_t descs[RTE_IXGBE_DESCS_PER_LOOP];
		uint8x16_t pkt_mb1, pkt_mb2, pkt_mb3, pkt_mb4;
		uint8x16x2_t sterr_tmp1, sterr_tmp2;
		uint64x2_t mbp1, mbp2;
		uint8x16_t staterr;
		uint16x8_t tmp;
		uint32_t var = 0;
		uint32_t stat;

		/* B.1 load 1 mbuf point */
		mbp1 = vld1q_u64((uint64_t *)&sw_ring[pos]);

		/* B.2 copy 2 mbuf point into rx_pkts  */
		vst1q_u64((uint64_t *)&rx_pkts[pos], mbp1);

		/* B.1 load 1 mbuf point */
		mbp2 = vld1q_u64((uint64_t *)&sw_ring[pos + 2]);

		/* A. load 4 pkts descs */
		descs[0] =  vld1q_u64((uint64_t *)(rxdp));
		descs[1] =  vld1q_u64((uint64_t *)(rxdp + 1));
		descs[2] =  vld1q_u64((uint64_t *)(rxdp + 2));
		descs[3] =  vld1q_u64((uint64_t *)(rxdp + 3));
		rte_smp_rmb();

		/* B.2 copy 2 mbuf point into rx_pkts  */
		vst1q_u64((uint64_t *)&rx_pkts[pos + 2], mbp2);

		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]);
		}

		/* D.1 pkt 3,4 convert format from desc to pktmbuf */
		pkt_mb4 = vqtbl1q_u8(vreinterpretq_u8_u64(descs[3]), shuf_msk);
		pkt_mb3 = vqtbl1q_u8(vreinterpretq_u8_u64(descs[2]), shuf_msk);

		/* D.1 pkt 1,2 convert format from desc to pktmbuf */
		pkt_mb2 = vqtbl1q_u8(vreinterpretq_u8_u64(descs[1]), shuf_msk);
		pkt_mb1 = vqtbl1q_u8(vreinterpretq_u8_u64(descs[0]), shuf_msk);

		/* C.1 4=>2 filter staterr info only */
		sterr_tmp2 = vzipq_u8(vreinterpretq_u8_u64(descs[1]),
				      vreinterpretq_u8_u64(descs[3]));
		/* C.1 4=>2 filter staterr info only */
		sterr_tmp1 = vzipq_u8(vreinterpretq_u8_u64(descs[0]),
				      vreinterpretq_u8_u64(descs[2]));

		/* C.2 get 4 pkts staterr value  */
		staterr = vzipq_u8(sterr_tmp1.val[1], sterr_tmp2.val[1]).val[0];
		stat = vgetq_lane_u32(vreinterpretq_u32_u8(staterr), 0);

		/* set ol_flags with vlan packet type */
		desc_to_olflags_v(sterr_tmp1, sterr_tmp2, staterr,
				  &rx_pkts[pos]);

		/* D.2 pkt 3,4 set in_port/nb_seg and remove crc */
		tmp = vsubq_u16(vreinterpretq_u16_u8(pkt_mb4), crc_adjust);
		pkt_mb4 = vreinterpretq_u8_u16(tmp);
		tmp = vsubq_u16(vreinterpretq_u16_u8(pkt_mb3), crc_adjust);
		pkt_mb3 = vreinterpretq_u8_u16(tmp);

		/* D.3 copy final 3,4 data to rx_pkts */
		vst1q_u8((void *)&rx_pkts[pos + 3]->rx_descriptor_fields1,
			 pkt_mb4);
		vst1q_u8((void *)&rx_pkts[pos + 2]->rx_descriptor_fields1,
			 pkt_mb3);

		/* D.2 pkt 1,2 set in_port/nb_seg and remove crc */
		tmp = vsubq_u16(vreinterpretq_u16_u8(pkt_mb2), crc_adjust);
		pkt_mb2 = vreinterpretq_u8_u16(tmp);
		tmp = vsubq_u16(vreinterpretq_u16_u8(pkt_mb1), crc_adjust);
		pkt_mb1 = vreinterpretq_u8_u16(tmp);

		/* C* extract and record EOP bit */
		if (split_packet) {
			/* and with mask to extract bits, flipping 1-0 */
			*(int *)split_packet = ~stat & IXGBE_VPMD_DESC_EOP_MASK;

			split_packet += RTE_IXGBE_DESCS_PER_LOOP;
		}

		rte_prefetch_non_temporal(rxdp + RTE_IXGBE_DESCS_PER_LOOP);

		/* D.3 copy final 1,2 data to rx_pkts */
		vst1q_u8((uint8_t *)&rx_pkts[pos + 1]->rx_descriptor_fields1,
			 pkt_mb2);
		vst1q_u8((uint8_t *)&rx_pkts[pos]->rx_descriptor_fields1,
			 pkt_mb1);

		stat &= IXGBE_VPMD_DESC_DD_MASK;

		/* C.4 calc avaialbe number of desc */
		if (likely(stat != IXGBE_VPMD_DESC_DD_MASK)) {
			while (stat & 0x01) {
				++var;
				stat = stat >> 8;
			}
			nb_pkts_recd += var;
			break;
		} else {
			nb_pkts_recd += RTE_IXGBE_DESCS_PER_LOOP;
		}
	}

	/* 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, only accept(nb_pkts >= RTE_IXGBE_DESCS_PER_LOOP)
 *
 * Notice:
 * - nb_pkts < RTE_IXGBE_DESCS_PER_LOOP, just return no packet
 * - nb_pkts > RTE_IXGBE_MAX_RX_BURST, only scan RTE_IXGBE_MAX_RX_BURST
 *   numbers of DD bit
 * - floor align nb_pkts to a RTE_IXGBE_DESC_PER_LOOP power-of-two
 * - don't support ol_flags for rss and csum err
 */
uint16_t
ixgbe_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);
}

/*
 * vPMD receive routine that reassembles scattered packets
 *
 * Notice:
 * - don't support ol_flags for rss and csum err
 * - nb_pkts < RTE_IXGBE_DESCS_PER_LOOP, just return no packet
 * - nb_pkts > RTE_IXGBE_MAX_RX_BURST, only scan RTE_IXGBE_MAX_RX_BURST
 *   numbers of DD bit
 * - floor align nb_pkts to a RTE_IXGBE_DESC_PER_LOOP power-of-two
 */
uint16_t
ixgbe_recv_scattered_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts,
		uint16_t nb_pkts)
{
	struct ixgbe_rx_queue *rxq = rx_queue;
	uint8_t split_flags[RTE_IXGBE_MAX_RX_BURST] = {0};

	/* get some new buffers */
	uint16_t nb_bufs = _recv_raw_pkts_vec(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 == NULL &&
			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*/
	unsigned int i = 0;
	if (rxq->pkt_first_seg == NULL) {
		/* find the first split flag, and only reassemble then*/
		while (i < nb_bufs && !split_flags[i])
			i++;
		if (i == nb_bufs)
			return nb_bufs;
	}
	return i + reassemble_packets(rxq, &rx_pkts[i], nb_bufs - i,
		&split_flags[i]);
}

static inline void
vtx1(volatile union ixgbe_adv_tx_desc *txdp,
		struct rte_mbuf *pkt, uint64_t flags)
{
	uint64x2_t descriptor = {
			pkt->buf_iova + pkt->data_off,
			(uint64_t)pkt->pkt_len << 46 | flags | pkt->data_len};

	vst1q_u64((uint64_t *)&txdp->read, descriptor);
}

static inline void
vtx(volatile union ixgbe_adv_tx_desc *txdp,
		struct rte_mbuf **pkt, uint16_t nb_pkts,  uint64_t flags)
{
	int i;

	for (i = 0; i < nb_pkts; ++i, ++txdp, ++pkt)
		vtx1(txdp, *pkt, flags);
}

uint16_t
ixgbe_xmit_fixed_burst_vec(void *tx_queue, struct rte_mbuf **tx_pkts,
			   uint16_t nb_pkts)
{
	struct ixgbe_tx_queue *txq = (struct ixgbe_tx_queue *)tx_queue;
	volatile union ixgbe_adv_tx_desc *txdp;
	struct ixgbe_tx_entry_v *txep;
	uint16_t n, nb_commit, tx_id;
	uint64_t flags = DCMD_DTYP_FLAGS;
	uint64_t rs = IXGBE_ADVTXD_DCMD_RS | DCMD_DTYP_FLAGS;
	int i;

	/* cross rx_thresh boundary is not allowed */
	nb_pkts = RTE_MIN(nb_pkts, txq->tx_rs_thresh);

	if (txq->nb_tx_free < txq->tx_free_thresh)
		ixgbe_tx_free_bufs(txq);

	nb_commit = nb_pkts = (uint16_t)RTE_MIN(txq->nb_tx_free, nb_pkts);
	if (unlikely(nb_pkts == 0))
		return 0;

	tx_id = txq->tx_tail;
	txdp = &txq->tx_ring[tx_id];
	txep = &txq->sw_ring_v[tx_id];

	txq->nb_tx_free = (uint16_t)(txq->nb_tx_free - nb_pkts);

	n = (uint16_t)(txq->nb_tx_desc - tx_id);
	if (nb_commit >= n) {
		tx_backlog_entry(txep, tx_pkts, n);

		for (i = 0; i < n - 1; ++i, ++tx_pkts, ++txdp)
			vtx1(txdp, *tx_pkts, flags);

		vtx1(txdp, *tx_pkts++, rs);

		nb_commit = (uint16_t)(nb_commit - n);

		tx_id = 0;
		txq->tx_next_rs = (uint16_t)(txq->tx_rs_thresh - 1);

		/* avoid reach the end of ring */
		txdp = &txq->tx_ring[tx_id];
		txep = &txq->sw_ring_v[tx_id];
	}

	tx_backlog_entry(txep, tx_pkts, nb_commit);

	vtx(txdp, tx_pkts, nb_commit, flags);

	tx_id = (uint16_t)(tx_id + nb_commit);
	if (tx_id > txq->tx_next_rs) {
		txq->tx_ring[txq->tx_next_rs].read.cmd_type_len |=
			rte_cpu_to_le_32(IXGBE_ADVTXD_DCMD_RS);
		txq->tx_next_rs = (uint16_t)(txq->tx_next_rs +
			txq->tx_rs_thresh);
	}

	txq->tx_tail = tx_id;

	IXGBE_PCI_REG_WRITE(txq->tdt_reg_addr, txq->tx_tail);

	return nb_pkts;
}

static void __attribute__((cold))
ixgbe_tx_queue_release_mbufs_vec(struct ixgbe_tx_queue *txq)
{
	_ixgbe_tx_queue_release_mbufs_vec(txq);
}

void __attribute__((cold))
ixgbe_rx_queue_release_mbufs_vec(struct ixgbe_rx_queue *rxq)
{
	_ixgbe_rx_queue_release_mbufs_vec(rxq);
}

static void __attribute__((cold))
ixgbe_tx_free_swring(struct ixgbe_tx_queue *txq)
{
	_ixgbe_tx_free_swring_vec(txq);
}

static void __attribute__((cold))
ixgbe_reset_tx_queue(struct ixgbe_tx_queue *txq)
{
	_ixgbe_reset_tx_queue_vec(txq);
}

static const struct ixgbe_txq_ops vec_txq_ops = {
	.release_mbufs = ixgbe_tx_queue_release_mbufs_vec,
	.free_swring = ixgbe_tx_free_swring,
	.reset = ixgbe_reset_tx_queue,
};

int __attribute__((cold))
ixgbe_rxq_vec_setup(struct ixgbe_rx_queue *rxq)
{
	return ixgbe_rxq_vec_setup_default(rxq);
}

int __attribute__((cold))
ixgbe_txq_vec_setup(struct ixgbe_tx_queue *txq)
{
	return ixgbe_txq_vec_setup_default(txq, &vec_txq_ops);
}

int __attribute__((cold))
ixgbe_rx_vec_dev_conf_condition_check(struct rte_eth_dev *dev)
{
	struct rte_eth_rxmode *rxmode = &dev->data->dev_conf.rxmode;

	/* no csum error report support */
	if (rxmode->offloads & DEV_RX_OFFLOAD_CHECKSUM)
		return -1;

	return ixgbe_rx_vec_dev_conf_condition_check_default(dev);
}