From: Joyce Kong <joyce.kong@arm.com>
To: maxime.coquelin@redhat.com, chenbo.xia@intel.com,
jerinj@marvell.com, ruifeng.wang@arm.com,
honnappa.nagarahalli@arm.com
Cc: dev@dpdk.org, nd@arm.com
Subject: [dpdk-dev] [PATCH v1 2/4] net/virtio: add vectorized packed ring Rx NEON path
Date: Tue, 17 Nov 2020 18:06:33 +0800 [thread overview]
Message-ID: <20201117100635.27690-3-joyce.kong@arm.com> (raw)
In-Reply-To: <20201117100635.27690-1-joyce.kong@arm.com>
Optimize packed ring Rx batch path with NEON instructions.
Signed-off-by: Joyce Kong <joyce.kong@arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
---
drivers/net/virtio/virtio_rxtx_packed.h | 15 ++
drivers/net/virtio/virtio_rxtx_packed_neon.h | 150 +++++++++++++++++++
2 files changed, 165 insertions(+)
create mode 100644 drivers/net/virtio/virtio_rxtx_packed_neon.h
diff --git a/drivers/net/virtio/virtio_rxtx_packed.h b/drivers/net/virtio/virtio_rxtx_packed.h
index b0b1d63ec..8f5198ad7 100644
--- a/drivers/net/virtio/virtio_rxtx_packed.h
+++ b/drivers/net/virtio/virtio_rxtx_packed.h
@@ -19,9 +19,16 @@
#include "virtqueue.h"
#define BYTE_SIZE 8
+
+#ifdef CC_AVX512_SUPPORT
/* flag bits offset in packed ring desc higher 64bits */
#define FLAGS_BITS_OFFSET ((offsetof(struct vring_packed_desc, flags) - \
offsetof(struct vring_packed_desc, len)) * BYTE_SIZE)
+#elif defined(RTE_ARCH_ARM)
+/* flag bits offset in packed ring desc from ID */
+#define FLAGS_BITS_OFFSET ((offsetof(struct vring_packed_desc, flags) - \
+ offsetof(struct vring_packed_desc, id)) * BYTE_SIZE)
+#endif
#define PACKED_FLAGS_MASK ((0ULL | VRING_PACKED_DESC_F_AVAIL_USED) << \
FLAGS_BITS_OFFSET)
@@ -44,8 +51,16 @@
/* net hdr short size mask */
#define NET_HDR_MASK 0x3F
+#ifdef RTE_ARCH_ARM
+/* The cache line size on different Arm platforms are different, so
+ * put a four batch size here to match with the minimum cache line
+ * size and accommodate NEON register size.
+ */
+#define PACKED_BATCH_SIZE 4
+#else
#define PACKED_BATCH_SIZE (RTE_CACHE_LINE_SIZE / \
sizeof(struct vring_packed_desc))
+#endif
#define PACKED_BATCH_MASK (PACKED_BATCH_SIZE - 1)
#ifdef VIRTIO_GCC_UNROLL_PRAGMA
diff --git a/drivers/net/virtio/virtio_rxtx_packed_neon.h b/drivers/net/virtio/virtio_rxtx_packed_neon.h
new file mode 100644
index 000000000..fb1e49909
--- /dev/null
+++ b/drivers/net/virtio/virtio_rxtx_packed_neon.h
@@ -0,0 +1,150 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2020 Arm Corporation
+ */
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+
+#include <rte_net.h>
+#include <rte_vect.h>
+
+#include "virtio_ethdev.h"
+#include "virtio_pci.h"
+#include "virtio_rxtx_packed.h"
+#include "virtqueue.h"
+
+static inline uint16_t
+virtqueue_dequeue_batch_packed_vec(struct virtnet_rx *rxvq,
+ struct rte_mbuf **rx_pkts)
+{
+ struct virtqueue *vq = rxvq->vq;
+ struct virtio_hw *hw = vq->hw;
+ uint16_t head_size = hw->vtnet_hdr_size;
+ uint16_t id = vq->vq_used_cons_idx;
+ struct vring_packed_desc *p_desc;
+ uint16_t i;
+
+ if (id & PACKED_BATCH_MASK)
+ return -1;
+
+ if (unlikely((id + PACKED_BATCH_SIZE) > vq->vq_nentries))
+ return -1;
+
+ /* Map packed descriptor to mbuf fields. */
+ uint8x16_t shuf_msk1 = {
+ 0xFF, 0xFF, 0xFF, 0xFF, /* pkt_type set as unknown */
+ 0, 1, /* octet 1~0, low 16 bits pkt_len */
+ 0xFF, 0xFF, /* skip high 16 bits of pkt_len, zero out */
+ 0, 1, /* octet 1~0, 16 bits data_len */
+ 0xFF, 0xFF, /* vlan tci set as unknown */
+ 0xFF, 0xFF, 0xFF, 0xFF
+ };
+
+ uint8x16_t shuf_msk2 = {
+ 0xFF, 0xFF, 0xFF, 0xFF, /* pkt_type set as unknown */
+ 8, 9, /* octet 9~8, low 16 bits pkt_len */
+ 0xFF, 0xFF, /* skip high 16 bits of pkt_len, zero out */
+ 8, 9, /* octet 9~8, 16 bits data_len */
+ 0xFF, 0xFF, /* vlan tci set as unknown */
+ 0xFF, 0xFF, 0xFF, 0xFF
+ };
+
+ /* Subtract the header length. */
+ uint16x8_t len_adjust = {
+ 0, 0, /* ignore pkt_type field */
+ head_size, /* sub head_size on pkt_len */
+ 0, /* ignore high 16 bits of pkt_len */
+ head_size, /* sub head_size on data_len */
+ 0, 0, 0 /* ignore non-length fields */
+ };
+
+ uint64x2_t desc[PACKED_BATCH_SIZE / 2];
+ uint64x2x2_t mbp[PACKED_BATCH_SIZE / 2];
+ uint64x2_t pkt_mb[PACKED_BATCH_SIZE];
+
+ p_desc = &vq->vq_packed.ring.desc[id];
+ /* Load high 64 bits of packed descriptor 0,1. */
+ desc[0] = vld2q_u64((uint64_t *)(p_desc)).val[1];
+ /* Load high 64 bits of packed descriptor 2,3. */
+ desc[1] = vld2q_u64((uint64_t *)(p_desc + 2)).val[1];
+
+ /* Only care avail/used bits. */
+ uint32x4_t v_mask = vdupq_n_u32(PACKED_FLAGS_MASK);
+ /* Extract high 32 bits of packed descriptor (id, flags). */
+ uint32x4_t v_desc = vuzp2q_u32(vreinterpretq_u32_u64(desc[0]),
+ vreinterpretq_u32_u64(desc[1]));
+ uint32x4_t v_flag = vandq_u32(v_desc, v_mask);
+
+ uint32x4_t v_used_flag = vdupq_n_u32(0);
+ if (vq->vq_packed.used_wrap_counter)
+ v_used_flag = vdupq_n_u32(PACKED_FLAGS_MASK);
+
+ poly128_t desc_stats = vreinterpretq_p128_u32(~vceqq_u32(v_flag, v_used_flag));
+
+ /* Check all descs are used. */
+ if (desc_stats)
+ return -1;
+
+ /* Load 2 mbuf pointers per time. */
+ mbp[0] = vld2q_u64((uint64_t *)&vq->vq_descx[id]);
+ vst1q_u64((uint64_t *)&rx_pkts[0], mbp[0].val[0]);
+
+ mbp[1] = vld2q_u64((uint64_t *)&vq->vq_descx[id + 2]);
+ vst1q_u64((uint64_t *)&rx_pkts[2], mbp[1].val[0]);
+
+ /**
+ * Update data length and packet length for descriptor.
+ * structure of pkt_mb:
+ * --------------------------------------------------------------------
+ * |32 bits pkt_type|32 bits pkt_len|16 bits data_len|16 bits vlan_tci|
+ * --------------------------------------------------------------------
+ */
+ pkt_mb[0] = vreinterpretq_u64_u8(vqtbl1q_u8(
+ vreinterpretq_u8_u64(desc[0]), shuf_msk1));
+ pkt_mb[1] = vreinterpretq_u64_u8(vqtbl1q_u8(
+ vreinterpretq_u8_u64(desc[0]), shuf_msk2));
+ pkt_mb[2] = vreinterpretq_u64_u8(vqtbl1q_u8(
+ vreinterpretq_u8_u64(desc[1]), shuf_msk1))'
+ pkt_mb[3] = vreinterpretq_u64_u8(vqtbl1q_u8(
+ vreinterpretq_u8_u64(desc[1]), shuf_msk2));
+
+ pkt_mb[0] = vreinterpretq_u64_u16(vsubq_u16(
+ vreinterpretq_u16_u64(pkt_mb[0]), len_adjust));
+ pkt_mb[1] = vreinterpretq_u64_u16(vsubq_u16(
+ vreinterpretq_u16_u64(pkt_mb[1]), len_adjust));
+ pkt_mb[2] = vreinterpretq_u64_u16(vsubq_u16(
+ vreinterpretq_u16_u64(pkt_mb[2]), len_adjust));
+ pkt_mb[3] = vreinterpretq_u64_u16(vsubq_u16(
+ vreinterpretq_u16_u64(pkt_mb[3]), len_adjust));
+
+ vst1q_u64((void *)&rx_pkts[0]->rx_descriptor_fields1, pkt_mb[0]);
+ vst1q_u64((void *)&rx_pkts[1]->rx_descriptor_fields1, pkt_mb[1]);
+ vst1q_u64((void *)&rx_pkts[2]->rx_descriptor_fields1, pkt_mb[2]);
+ vst1q_u64((void *)&rx_pkts[3]->rx_descriptor_fields1, pkt_mb[3]);
+
+ if (hw->has_rx_offload) {
+ virtio_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
+ char *addr = (char *)rx_pkts[i]->buf_addr +
+ RTE_PKTMBUF_HEADROOM - head_size;
+ virtio_vec_rx_offload(rx_pkts[i],
+ (struct virtio_net_hdr *)addr);
+ }
+ }
+
+ virtio_update_batch_stats(&rxvq->stats, rx_pkts[0]->pkt_len,
+ rx_pkts[1]->pkt_len, rx_pkts[2]->pkt_len,
+ rx_pkts[3]->pkt_len);
+
+ vq->vq_free_cnt += PACKED_BATCH_SIZE;
+
+ vq->vq_used_cons_idx += PACKED_BATCH_SIZE;
+ if (vq->vq_used_cons_idx >= vq->vq_nentries) {
+ vq->vq_used_cons_idx -= vq->vq_nentries;
+ vq->vq_packed.used_wrap_counter ^= 1;
+ }
+
+ return 0;
+}
--
2.28.0
next prev parent reply other threads:[~2020-11-17 10:07 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-11 12:09 [dpdk-dev] [RFC 0/3] Vectorize packed ring RX path with NEON Joyce Kong
2020-09-11 12:09 ` [dpdk-dev] [RFC 1/3] net/virtio: move AVX based Rx and Tx code to separate file Joyce Kong
2020-09-11 12:09 ` [dpdk-dev] [RFC 2/3] net/virtio: add vectorized packed ring Rx NEON path Joyce Kong
2020-09-11 12:09 ` [dpdk-dev] [RFC 3/3] net/virtio: add election for packed vector " Joyce Kong
2020-10-05 7:34 ` [dpdk-dev] [RFC 0/3] Vectorize packed ring RX path with NEON Maxime Coquelin
2020-10-08 6:54 ` Joyce Kong
2020-10-15 9:01 ` Ruifeng Wang
2020-10-15 9:02 ` Maxime Coquelin
2020-11-17 10:06 ` [dpdk-dev] [PATCH v1 0/4] Vectorize packed ring RX/TX " Joyce Kong
2020-11-17 10:06 ` [dpdk-dev] [PATCH v1 1/4] net/virtio: move AVX based Rx and Tx code to separate file Joyce Kong
2021-01-05 14:06 ` Maxime Coquelin
2020-11-17 10:06 ` Joyce Kong [this message]
2021-01-05 14:16 ` [dpdk-dev] [PATCH v1 2/4] net/virtio: add vectorized packed ring Rx NEON path Maxime Coquelin
2021-01-05 14:27 ` Maxime Coquelin
2021-01-07 10:39 ` Maxime Coquelin
2021-01-08 7:29 ` Joyce Kong
2021-01-08 17:02 ` Ferruh Yigit
2021-01-08 22:26 ` Honnappa Nagarahalli
2021-01-11 13:05 ` Aaron Conole
2021-01-11 10:45 ` Maxime Coquelin
2021-01-11 13:04 ` Aaron Conole
2020-11-17 10:06 ` [dpdk-dev] [PATCH v1 3/4] net/virtio: add vectorized packed ring Tx " Joyce Kong
2021-01-05 14:33 ` Maxime Coquelin
2020-11-17 10:06 ` [dpdk-dev] [PATCH v1 4/4] net/virtio: add election for packed vector " Joyce Kong
2021-01-05 14:42 ` Maxime Coquelin
2021-01-08 9:11 ` [dpdk-dev] [PATCH v1 0/4] Vectorize packed ring RX/TX path with NEON Maxime Coquelin
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