From 97f17497d162afdb82c8704bf097f0fee3724b2e Mon Sep 17 00:00:00 2001 From: "C.J. Collier" Date: Tue, 14 Jun 2016 07:50:17 -0700 Subject: Imported Upstream version 16.04 Change-Id: I77eadcd8538a9122e4773cbe55b24033dc451757 Signed-off-by: C.J. Collier --- drivers/net/virtio/virtio_rxtx_simple.c | 418 ++++++++++++++++++++++++++++++++ 1 file changed, 418 insertions(+) create mode 100644 drivers/net/virtio/virtio_rxtx_simple.c (limited to 'drivers/net/virtio/virtio_rxtx_simple.c') diff --git a/drivers/net/virtio/virtio_rxtx_simple.c b/drivers/net/virtio/virtio_rxtx_simple.c new file mode 100644 index 00000000..8f5293dd --- /dev/null +++ b/drivers/net/virtio/virtio_rxtx_simple.c @@ -0,0 +1,418 @@ +/*- + * 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 +#include +#include +#include +#include + +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "virtio_logs.h" +#include "virtio_ethdev.h" +#include "virtqueue.h" +#include "virtio_rxtx.h" + +#define RTE_VIRTIO_VPMD_RX_BURST 32 +#define RTE_VIRTIO_DESC_PER_LOOP 8 +#define RTE_VIRTIO_VPMD_RX_REARM_THRESH RTE_VIRTIO_VPMD_RX_BURST + +#ifndef __INTEL_COMPILER +#pragma GCC diagnostic ignored "-Wcast-qual" +#endif + +int __attribute__((cold)) +virtqueue_enqueue_recv_refill_simple(struct virtqueue *vq, + struct rte_mbuf *cookie) +{ + struct vq_desc_extra *dxp; + struct vring_desc *start_dp; + uint16_t desc_idx; + + desc_idx = vq->vq_avail_idx & (vq->vq_nentries - 1); + dxp = &vq->vq_descx[desc_idx]; + dxp->cookie = (void *)cookie; + vq->sw_ring[desc_idx] = cookie; + + start_dp = vq->vq_ring.desc; + start_dp[desc_idx].addr = (uint64_t)((uintptr_t)cookie->buf_physaddr + + RTE_PKTMBUF_HEADROOM - vq->hw->vtnet_hdr_size); + start_dp[desc_idx].len = cookie->buf_len - + RTE_PKTMBUF_HEADROOM + vq->hw->vtnet_hdr_size; + + vq->vq_free_cnt--; + vq->vq_avail_idx++; + + return 0; +} + +static inline void +virtio_rxq_rearm_vec(struct virtqueue *rxvq) +{ + int i; + uint16_t desc_idx; + struct rte_mbuf **sw_ring; + struct vring_desc *start_dp; + int ret; + + desc_idx = rxvq->vq_avail_idx & (rxvq->vq_nentries - 1); + sw_ring = &rxvq->sw_ring[desc_idx]; + start_dp = &rxvq->vq_ring.desc[desc_idx]; + + ret = rte_mempool_get_bulk(rxvq->mpool, (void **)sw_ring, + RTE_VIRTIO_VPMD_RX_REARM_THRESH); + if (unlikely(ret)) { + rte_eth_devices[rxvq->port_id].data->rx_mbuf_alloc_failed += + RTE_VIRTIO_VPMD_RX_REARM_THRESH; + return; + } + + for (i = 0; i < RTE_VIRTIO_VPMD_RX_REARM_THRESH; i++) { + uintptr_t p; + + p = (uintptr_t)&sw_ring[i]->rearm_data; + *(uint64_t *)p = rxvq->mbuf_initializer; + + start_dp[i].addr = + (uint64_t)((uintptr_t)sw_ring[i]->buf_physaddr + + RTE_PKTMBUF_HEADROOM - rxvq->hw->vtnet_hdr_size); + start_dp[i].len = sw_ring[i]->buf_len - + RTE_PKTMBUF_HEADROOM + rxvq->hw->vtnet_hdr_size; + } + + rxvq->vq_avail_idx += RTE_VIRTIO_VPMD_RX_REARM_THRESH; + rxvq->vq_free_cnt -= RTE_VIRTIO_VPMD_RX_REARM_THRESH; + vq_update_avail_idx(rxvq); +} + +/* virtio vPMD receive routine, only accept(nb_pkts >= RTE_VIRTIO_DESC_PER_LOOP) + * + * This routine is for non-mergeable RX, one desc for each guest buffer. + * This routine is based on the RX ring layout optimization. Each entry in the + * avail ring points to the desc with the same index in the desc ring and this + * will never be changed in the driver. + * + * - nb_pkts < RTE_VIRTIO_DESC_PER_LOOP, just return no packet + */ +uint16_t +virtio_recv_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts, + uint16_t nb_pkts) +{ + struct virtqueue *rxvq = rx_queue; + uint16_t nb_used; + uint16_t desc_idx; + struct vring_used_elem *rused; + struct rte_mbuf **sw_ring; + struct rte_mbuf **sw_ring_end; + uint16_t nb_pkts_received; + __m128i shuf_msk1, shuf_msk2, len_adjust; + + shuf_msk1 = _mm_set_epi8( + 0xFF, 0xFF, 0xFF, 0xFF, + 0xFF, 0xFF, /* vlan tci */ + 5, 4, /* dat len */ + 0xFF, 0xFF, 5, 4, /* pkt len */ + 0xFF, 0xFF, 0xFF, 0xFF /* packet type */ + + ); + + shuf_msk2 = _mm_set_epi8( + 0xFF, 0xFF, 0xFF, 0xFF, + 0xFF, 0xFF, /* vlan tci */ + 13, 12, /* dat len */ + 0xFF, 0xFF, 13, 12, /* pkt len */ + 0xFF, 0xFF, 0xFF, 0xFF /* packet type */ + ); + + /* Subtract the header length. + * In which case do we need the header length in used->len ? + */ + len_adjust = _mm_set_epi16( + 0, 0, + 0, + (uint16_t)-rxvq->hw->vtnet_hdr_size, + 0, (uint16_t)-rxvq->hw->vtnet_hdr_size, + 0, 0); + + if (unlikely(nb_pkts < RTE_VIRTIO_DESC_PER_LOOP)) + return 0; + + nb_used = *(volatile uint16_t *)&rxvq->vq_ring.used->idx - + rxvq->vq_used_cons_idx; + + rte_compiler_barrier(); + + if (unlikely(nb_used == 0)) + return 0; + + nb_pkts = RTE_ALIGN_FLOOR(nb_pkts, RTE_VIRTIO_DESC_PER_LOOP); + nb_used = RTE_MIN(nb_used, nb_pkts); + + desc_idx = (uint16_t)(rxvq->vq_used_cons_idx & (rxvq->vq_nentries - 1)); + rused = &rxvq->vq_ring.used->ring[desc_idx]; + sw_ring = &rxvq->sw_ring[desc_idx]; + sw_ring_end = &rxvq->sw_ring[rxvq->vq_nentries]; + + _mm_prefetch((const void *)rused, _MM_HINT_T0); + + if (rxvq->vq_free_cnt >= RTE_VIRTIO_VPMD_RX_REARM_THRESH) { + virtio_rxq_rearm_vec(rxvq); + if (unlikely(virtqueue_kick_prepare(rxvq))) + virtqueue_notify(rxvq); + } + + for (nb_pkts_received = 0; + nb_pkts_received < nb_used;) { + __m128i desc[RTE_VIRTIO_DESC_PER_LOOP / 2]; + __m128i mbp[RTE_VIRTIO_DESC_PER_LOOP / 2]; + __m128i pkt_mb[RTE_VIRTIO_DESC_PER_LOOP]; + + mbp[0] = _mm_loadu_si128((__m128i *)(sw_ring + 0)); + desc[0] = _mm_loadu_si128((__m128i *)(rused + 0)); + _mm_storeu_si128((__m128i *)&rx_pkts[0], mbp[0]); + + mbp[1] = _mm_loadu_si128((__m128i *)(sw_ring + 2)); + desc[1] = _mm_loadu_si128((__m128i *)(rused + 2)); + _mm_storeu_si128((__m128i *)&rx_pkts[2], mbp[1]); + + mbp[2] = _mm_loadu_si128((__m128i *)(sw_ring + 4)); + desc[2] = _mm_loadu_si128((__m128i *)(rused + 4)); + _mm_storeu_si128((__m128i *)&rx_pkts[4], mbp[2]); + + mbp[3] = _mm_loadu_si128((__m128i *)(sw_ring + 6)); + desc[3] = _mm_loadu_si128((__m128i *)(rused + 6)); + _mm_storeu_si128((__m128i *)&rx_pkts[6], mbp[3]); + + pkt_mb[1] = _mm_shuffle_epi8(desc[0], shuf_msk2); + pkt_mb[0] = _mm_shuffle_epi8(desc[0], shuf_msk1); + pkt_mb[1] = _mm_add_epi16(pkt_mb[1], len_adjust); + pkt_mb[0] = _mm_add_epi16(pkt_mb[0], len_adjust); + _mm_storeu_si128((void *)&rx_pkts[1]->rx_descriptor_fields1, + pkt_mb[1]); + _mm_storeu_si128((void *)&rx_pkts[0]->rx_descriptor_fields1, + pkt_mb[0]); + + pkt_mb[3] = _mm_shuffle_epi8(desc[1], shuf_msk2); + pkt_mb[2] = _mm_shuffle_epi8(desc[1], shuf_msk1); + pkt_mb[3] = _mm_add_epi16(pkt_mb[3], len_adjust); + pkt_mb[2] = _mm_add_epi16(pkt_mb[2], len_adjust); + _mm_storeu_si128((void *)&rx_pkts[3]->rx_descriptor_fields1, + pkt_mb[3]); + _mm_storeu_si128((void *)&rx_pkts[2]->rx_descriptor_fields1, + pkt_mb[2]); + + pkt_mb[5] = _mm_shuffle_epi8(desc[2], shuf_msk2); + pkt_mb[4] = _mm_shuffle_epi8(desc[2], shuf_msk1); + pkt_mb[5] = _mm_add_epi16(pkt_mb[5], len_adjust); + pkt_mb[4] = _mm_add_epi16(pkt_mb[4], len_adjust); + _mm_storeu_si128((void *)&rx_pkts[5]->rx_descriptor_fields1, + pkt_mb[5]); + _mm_storeu_si128((void *)&rx_pkts[4]->rx_descriptor_fields1, + pkt_mb[4]); + + pkt_mb[7] = _mm_shuffle_epi8(desc[3], shuf_msk2); + pkt_mb[6] = _mm_shuffle_epi8(desc[3], shuf_msk1); + pkt_mb[7] = _mm_add_epi16(pkt_mb[7], len_adjust); + pkt_mb[6] = _mm_add_epi16(pkt_mb[6], len_adjust); + _mm_storeu_si128((void *)&rx_pkts[7]->rx_descriptor_fields1, + pkt_mb[7]); + _mm_storeu_si128((void *)&rx_pkts[6]->rx_descriptor_fields1, + pkt_mb[6]); + + if (unlikely(nb_used <= RTE_VIRTIO_DESC_PER_LOOP)) { + if (sw_ring + nb_used <= sw_ring_end) + nb_pkts_received += nb_used; + else + nb_pkts_received += sw_ring_end - sw_ring; + break; + } else { + if (unlikely(sw_ring + RTE_VIRTIO_DESC_PER_LOOP >= + sw_ring_end)) { + nb_pkts_received += sw_ring_end - sw_ring; + break; + } else { + nb_pkts_received += RTE_VIRTIO_DESC_PER_LOOP; + + rx_pkts += RTE_VIRTIO_DESC_PER_LOOP; + sw_ring += RTE_VIRTIO_DESC_PER_LOOP; + rused += RTE_VIRTIO_DESC_PER_LOOP; + nb_used -= RTE_VIRTIO_DESC_PER_LOOP; + } + } + } + + rxvq->vq_used_cons_idx += nb_pkts_received; + rxvq->vq_free_cnt += nb_pkts_received; + rxvq->packets += nb_pkts_received; + return nb_pkts_received; +} + +#define VIRTIO_TX_FREE_THRESH 32 +#define VIRTIO_TX_MAX_FREE_BUF_SZ 32 +#define VIRTIO_TX_FREE_NR 32 +/* TODO: vq->tx_free_cnt could mean num of free slots so we could avoid shift */ +static inline void +virtio_xmit_cleanup(struct virtqueue *vq) +{ + uint16_t i, desc_idx; + int nb_free = 0; + struct rte_mbuf *m, *free[VIRTIO_TX_MAX_FREE_BUF_SZ]; + + desc_idx = (uint16_t)(vq->vq_used_cons_idx & + ((vq->vq_nentries >> 1) - 1)); + m = (struct rte_mbuf *)vq->vq_descx[desc_idx++].cookie; + m = __rte_pktmbuf_prefree_seg(m); + if (likely(m != NULL)) { + free[0] = m; + nb_free = 1; + for (i = 1; i < VIRTIO_TX_FREE_NR; i++) { + m = (struct rte_mbuf *)vq->vq_descx[desc_idx++].cookie; + m = __rte_pktmbuf_prefree_seg(m); + if (likely(m != NULL)) { + if (likely(m->pool == free[0]->pool)) + free[nb_free++] = m; + else { + rte_mempool_put_bulk(free[0]->pool, + (void **)free, nb_free); + free[0] = m; + nb_free = 1; + } + } + } + rte_mempool_put_bulk(free[0]->pool, (void **)free, nb_free); + } else { + for (i = 1; i < VIRTIO_TX_FREE_NR; i++) { + m = (struct rte_mbuf *)vq->vq_descx[desc_idx++].cookie; + m = __rte_pktmbuf_prefree_seg(m); + if (m != NULL) + rte_mempool_put(m->pool, m); + } + } + + vq->vq_used_cons_idx += VIRTIO_TX_FREE_NR; + vq->vq_free_cnt += (VIRTIO_TX_FREE_NR << 1); +} + +uint16_t +virtio_xmit_pkts_simple(void *tx_queue, struct rte_mbuf **tx_pkts, + uint16_t nb_pkts) +{ + struct virtqueue *txvq = tx_queue; + uint16_t nb_used; + uint16_t desc_idx; + struct vring_desc *start_dp; + uint16_t nb_tail, nb_commit; + int i; + uint16_t desc_idx_max = (txvq->vq_nentries >> 1) - 1; + + nb_used = VIRTQUEUE_NUSED(txvq); + rte_compiler_barrier(); + + if (nb_used >= VIRTIO_TX_FREE_THRESH) + virtio_xmit_cleanup(tx_queue); + + nb_commit = nb_pkts = RTE_MIN((txvq->vq_free_cnt >> 1), nb_pkts); + desc_idx = (uint16_t) (txvq->vq_avail_idx & desc_idx_max); + start_dp = txvq->vq_ring.desc; + nb_tail = (uint16_t) (desc_idx_max + 1 - desc_idx); + + if (nb_commit >= nb_tail) { + for (i = 0; i < nb_tail; i++) + txvq->vq_descx[desc_idx + i].cookie = tx_pkts[i]; + for (i = 0; i < nb_tail; i++) { + start_dp[desc_idx].addr = + rte_mbuf_data_dma_addr(*tx_pkts); + start_dp[desc_idx].len = (*tx_pkts)->pkt_len; + tx_pkts++; + desc_idx++; + } + nb_commit -= nb_tail; + desc_idx = 0; + } + for (i = 0; i < nb_commit; i++) + txvq->vq_descx[desc_idx + i].cookie = tx_pkts[i]; + for (i = 0; i < nb_commit; i++) { + start_dp[desc_idx].addr = rte_mbuf_data_dma_addr(*tx_pkts); + start_dp[desc_idx].len = (*tx_pkts)->pkt_len; + tx_pkts++; + desc_idx++; + } + + rte_compiler_barrier(); + + txvq->vq_free_cnt -= (uint16_t)(nb_pkts << 1); + txvq->vq_avail_idx += nb_pkts; + txvq->vq_ring.avail->idx = txvq->vq_avail_idx; + txvq->packets += nb_pkts; + + if (likely(nb_pkts)) { + if (unlikely(virtqueue_kick_prepare(txvq))) + virtqueue_notify(txvq); + } + + return nb_pkts; +} + +int __attribute__((cold)) +virtio_rxq_vec_setup(struct virtqueue *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; +} -- cgit 1.2.3-korg