use ARM NEON intrinsic to implement ixgbe vPMD
Signed-off-by: Jianbo Liu <jianbo.liu at linaro.org>
---
drivers/net/ixgbe/ixgbe_rxtx_vec.c | 4 +
drivers/net/ixgbe/ixgbe_rxtx_vec_neon.h | 371 ++++++++++++++++++++++++++++++++
2 files changed, 375 insertions(+)
create mode 100644 drivers/net/ixgbe/ixgbe_rxtx_vec_neon.h
diff --git a/drivers/net/ixgbe/ixgbe_rxtx_vec.c
b/drivers/net/ixgbe/ixgbe_rxtx_vec.c
index 064a00b..9fcc956 100644
--- a/drivers/net/ixgbe/ixgbe_rxtx_vec.c
+++ b/drivers/net/ixgbe/ixgbe_rxtx_vec.c
@@ -38,7 +38,11 @@
#include "ixgbe_ethdev.h"
#include "ixgbe_rxtx.h"
+#ifdef RTE_ARCH_ARM64
+#include "ixgbe_rxtx_vec_neon.h"
+#else
#include "ixgbe_rxtx_vec_sse.h"
+#endif
/*
* vPMD receive routine, only accept(nb_pkts >= RTE_IXGBE_DESCS_PER_LOOP)
diff --git a/drivers/net/ixgbe/ixgbe_rxtx_vec_neon.h
b/drivers/net/ixgbe/ixgbe_rxtx_vec_neon.h
new file mode 100644
index 0000000..2f1e1ce
--- /dev/null
+++ b/drivers/net/ixgbe/ixgbe_rxtx_vec_neon.h
@@ -0,0 +1,371 @@
+/*-
+ * 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 "ixgbe_ethdev.h"
+#include "ixgbe_rxtx.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.
+ * 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.
+ */
+ vst1_u8((uint8_t *)&mb0->rearm_data, p);
+ paddr = mb0->buf_physaddr + 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_physaddr + 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);
+}
+
+/* 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_IXGBE_RX_OLFLAGS_ENABLE
+
+#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, PKT_RX_VLAN_PKT,
+ PKT_RX_VLAN_PKT, PKT_RX_VLAN_PKT,
+ 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];
+}
+#else
+#define desc_to_olflags_v(sterr_tmp1, sterr_tmp2, staterr, rx_pkts)
+#endif
+
+/*
+ * 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;
+ uint64_t var;
+ 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 stat;
+
+ /* B.1 load 1 mbuf point */
+ mbp1 = vld1q_u64((uint64_t *)&sw_ring[pos]);
+
+ /* Read desc statuses backwards to avoid race condition */
+ /* A.1 load 4 pkts desc */
+ descs[3] = vld1q_u64((uint64_t *)(rxdp + 3));
+ rte_rmb();
+
+ /* 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]);
+
+ descs[2] = vld1q_u64((uint64_t *)(rxdp + 2));
+ /* B.1 load 2 mbuf point */
+ descs[1] = vld1q_u64((uint64_t *)(rxdp + 1));
+ descs[0] = vld1q_u64((uint64_t *)(rxdp));
+
+ /* B.2 copy 2 mbuf point into rx_pkts */
+ vst1q_u64((uint64_t *)&rx_pkts[pos + 2], mbp2);
+
+ if (split_packet) {
+ rte_prefetch_non_temporal(&rx_pkts[pos]->cacheline1);
+ rte_prefetch_non_temporal(&rx_pkts[pos+1]->cacheline1);
+ rte_prefetch_non_temporal(&rx_pkts[pos+2]->cacheline1);
+ rte_prefetch_non_temporal(&rx_pkts[pos+3]->cacheline1);
+ }
+
+ /* 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;
+
+ /* 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;
+ }
+
+ 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);
+
+ /* C.4 calc avaialbe number of desc */
+ var = __builtin_popcount(stat & IXGBE_VPMD_DESC_DD_MASK);
+ nb_pkts_recd += var;
+ if (likely(var != RTE_IXGBE_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;
+}
+
+static inline void
+vtx1(volatile union ixgbe_adv_tx_desc *txdp,
+ struct rte_mbuf *pkt, uint64_t flags)
+{
+ uint64x2_t descriptor = {
+ pkt->buf_physaddr + pkt->data_off,
+ (uint64_t)pkt->pkt_len << 46 | flags | pkt->data_len};
+
+ vst1q_u64((uint64_t *)&txdp->read, descriptor);
+}
--
1.8.3.1
