From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jason Wang Subject: Re: [PATCH 07/17] net/virtio: implement transmit path for packed queues Date: Mon, 26 Mar 2018 10:18:05 +0800 Message-ID: References: <20180316152120.13199-1-jfreimann@redhat.com> <20180316152120.13199-8-jfreimann@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Cc: tiwei.bie@intel.com, yliu@fridaylinux.org, maxime.coquelin@redhat.com, mst@redhat.com To: Jens Freimann , dev@dpdk.org Return-path: Received: from mx1.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by dpdk.org (Postfix) with ESMTP id 2EBC95F24 for ; Mon, 26 Mar 2018 04:18:20 +0200 (CEST) In-Reply-To: <20180316152120.13199-8-jfreimann@redhat.com> Content-Language: en-US List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" On 2018年03月16日 23:21, Jens Freimann wrote: > This implements the transmit path for devices with > support for Virtio 1.1. > > Add the feature bit for Virtio 1.1 and enable code to > add buffers to vring and mark descriptors as available. > > This is based on a patch by Yuanhan Liu. > > Signed-off-by: Jens Freiman > --- > drivers/net/virtio/Makefile | 1 + > drivers/net/virtio/virtio_ethdev.c | 11 ++- > drivers/net/virtio/virtio_ethdev.h | 3 + > drivers/net/virtio/virtio_rxtx.c | 7 +- > drivers/net/virtio/virtio_rxtx_1.1.c | 161 +++++++++++++++++++++++++++++++++++ > 5 files changed, 180 insertions(+), 3 deletions(-) > create mode 100644 drivers/net/virtio/virtio_rxtx_1.1.c > > diff --git a/drivers/net/virtio/Makefile b/drivers/net/virtio/Makefile > index 6c2c996..aa1e600 100644 > --- a/drivers/net/virtio/Makefile > +++ b/drivers/net/virtio/Makefile > @@ -28,6 +28,7 @@ LIBABIVER := 1 > SRCS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += virtqueue.c > SRCS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += virtio_pci.c > SRCS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += virtio_rxtx.c > +SRCS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += virtio_rxtx_1.1.c > SRCS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += virtio_ethdev.c > SRCS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += virtio_rxtx_simple.c > > diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c > index 19536eb..722a2cd 100644 > --- a/drivers/net/virtio/virtio_ethdev.c > +++ b/drivers/net/virtio/virtio_ethdev.c > @@ -383,6 +383,8 @@ struct rte_virtio_xstats_name_off { > vq->hw = hw; > vq->vq_queue_index = vtpci_queue_idx; > vq->vq_nentries = vq_size; > + if (vtpci_packed_queue(hw)) > + vq->vq_ring.avail_wrap_counter = 1; > > /* > * Reserve a memzone for vring elements > @@ -603,7 +605,8 @@ struct rte_virtio_xstats_name_off { > } > > vtpci_reset(hw); > - virtio_dev_free_mbufs(dev); > + if (!vtpci_packed_queue(hw)) > + virtio_dev_free_mbufs(dev); > virtio_free_queues(hw); > } > > @@ -1360,7 +1363,11 @@ static int virtio_dev_xstats_get_names(struct rte_eth_dev *dev, > eth_dev->rx_pkt_burst = &virtio_recv_pkts; > } > > - if (hw->use_simple_tx) { > + if (vtpci_packed_queue(hw)) { > + PMD_INIT_LOG(INFO, "virtio: using virtio 1.1 Tx path on port %u", > + eth_dev->data->port_id); > + eth_dev->tx_pkt_burst = virtio_xmit_pkts_packed; > + } else if (hw->use_simple_tx) { > PMD_INIT_LOG(INFO, "virtio: using simple Tx path on port %u", > eth_dev->data->port_id); > eth_dev->tx_pkt_burst = virtio_xmit_pkts_simple; > diff --git a/drivers/net/virtio/virtio_ethdev.h b/drivers/net/virtio/virtio_ethdev.h > index 4539d2e..cfefe4d 100644 > --- a/drivers/net/virtio/virtio_ethdev.h > +++ b/drivers/net/virtio/virtio_ethdev.h > @@ -36,6 +36,7 @@ > 1ULL << VIRTIO_NET_F_GUEST_ANNOUNCE | \ > 1u << VIRTIO_RING_F_INDIRECT_DESC | \ > 1ULL << VIRTIO_F_VERSION_1 | \ > + 1ULL << VIRTIO_F_RING_PACKED | \ > 1ULL << VIRTIO_F_IOMMU_PLATFORM) > > #define VIRTIO_PMD_SUPPORTED_GUEST_FEATURES \ > @@ -77,6 +78,8 @@ uint16_t virtio_recv_mergeable_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, > > uint16_t virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, > uint16_t nb_pkts); > +uint16_t virtio_xmit_pkts_packed(void *tx_queue, struct rte_mbuf **tx_pkts, > + uint16_t nb_pkts); > > uint16_t virtio_recv_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts, > uint16_t nb_pkts); > diff --git a/drivers/net/virtio/virtio_rxtx.c b/drivers/net/virtio/virtio_rxtx.c > index 8dbf2a3..f1df004 100644 > --- a/drivers/net/virtio/virtio_rxtx.c > +++ b/drivers/net/virtio/virtio_rxtx.c > @@ -545,6 +545,10 @@ > > PMD_INIT_FUNC_TRACE(); > > + if (vtpci_packed_queue(hw)) { > + vq->vq_ring.avail_wrap_counter = 1; > + } > + > if (hw->use_simple_tx) { > for (desc_idx = 0; desc_idx < mid_idx; desc_idx++) { > vq->vq_ring.avail->ring[desc_idx] = > @@ -565,7 +569,8 @@ > vq->vq_ring.avail->ring[desc_idx] = desc_idx; > } > > - VIRTQUEUE_DUMP(vq); > + if (!vtpci_packed_queue(hw)) > + VIRTQUEUE_DUMP(vq); > > return 0; > } > diff --git a/drivers/net/virtio/virtio_rxtx_1.1.c b/drivers/net/virtio/virtio_rxtx_1.1.c > new file mode 100644 > index 0000000..05ec085 > --- /dev/null > +++ b/drivers/net/virtio/virtio_rxtx_1.1.c > @@ -0,0 +1,161 @@ > +/*- > + * BSD LICENSE > + * > + * Copyright(c) 2010-2016 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 > +#include > +#include > +#include > + > +#include "virtio_logs.h" > +#include "virtio_ethdev.h" > +#include "virtio_pci.h" > +#include "virtqueue.h" > +#include "virtio_rxtx.h" > +#include "virtio_ring.h" > + > +/* Cleanup from completed transmits. */ > +static void > +virtio_xmit_cleanup(struct virtqueue *vq) > +{ > + uint16_t idx; > + uint16_t size = vq->vq_nentries; > + struct vring_desc_packed *desc = vq->vq_ring.desc_packed; > + > + idx = vq->vq_used_cons_idx & (size - 1); > + while (desc_is_used(&desc[idx]) && > + vq->vq_free_cnt < size) { > + while (desc[idx].flags & VRING_DESC_F_NEXT) { > + vq->vq_free_cnt++; > + idx = ++vq->vq_used_cons_idx & (size - 1); > + } > + vq->vq_free_cnt++; > + idx = ++vq->vq_used_cons_idx & (size - 1); > + } > +} > + > +uint16_t > +virtio_xmit_pkts_packed(void *tx_queue, struct rte_mbuf **tx_pkts, > + uint16_t nb_pkts) > +{ > + struct virtnet_tx *txvq = tx_queue; > + struct virtqueue *vq = txvq->vq; > + uint16_t i; > + struct vring_desc_packed *desc = vq->vq_ring.desc_packed; > + uint16_t idx; > + struct vq_desc_extra *dxp; > + > + if (unlikely(nb_pkts < 1)) > + return nb_pkts; > + > + PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts); > + > + if (likely(vq->vq_free_cnt < vq->vq_free_thresh)) > + virtio_xmit_cleanup(vq); > + > + for (i = 0; i < nb_pkts; i++) { > + struct rte_mbuf *txm = tx_pkts[i]; > + struct virtio_tx_region *txr = txvq->virtio_net_hdr_mz->addr; > + uint16_t head_idx; > + int wrap_counter; > + > + if (unlikely(txm->nb_segs + 1 > vq->vq_free_cnt)) { > + virtio_xmit_cleanup(vq); > + > + if (unlikely(txm->nb_segs + 1 > vq->vq_free_cnt)) { > + PMD_TX_LOG(ERR, > + "No free tx descriptors to transmit"); > + break; > + } > + } > + > + txvq->stats.bytes += txm->pkt_len; > + > + vq->vq_free_cnt -= txm->nb_segs + 1; > + > + idx = (vq->vq_avail_idx++) & (vq->vq_nentries - 1); > + head_idx = idx; > + wrap_counter = vq->vq_ring.avail_wrap_counter; > + > + if ((vq->vq_avail_idx & (vq->vq_nentries - 1)) == 0) > + toggle_wrap_counter(&vq->vq_ring); > + > + dxp = &vq->vq_descx[idx]; > + if (dxp->cookie != NULL) > + rte_pktmbuf_free(dxp->cookie); > + dxp->cookie = txm; > + > + desc[idx].addr = txvq->virtio_net_hdr_mem + > + RTE_PTR_DIFF(&txr[idx].tx_hdr, txr); > + desc[idx].len = vq->hw->vtnet_hdr_size; > + desc[idx].flags |= VRING_DESC_F_NEXT; > + > + do { > + idx = (vq->vq_avail_idx++) & (vq->vq_nentries - 1); > + desc[idx].addr = VIRTIO_MBUF_DATA_DMA_ADDR(txm, vq); > + desc[idx].len = txm->data_len; > + desc[idx].flags |= VRING_DESC_F_NEXT; > + if (idx == (vq->vq_nentries - 1)) > + toggle_wrap_counter(&vq->vq_ring); > + } while ((txm = txm->next) != NULL); > + > + desc[idx].flags &= ~VRING_DESC_F_NEXT; > + > + rte_smp_wmb(); > + _set_desc_avail(&desc[head_idx], wrap_counter); > + } Need to kick host here. Thanks > + > + txvq->stats.packets += i; > + txvq->stats.errors += nb_pkts - i; > + > + return i; > +}