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authorIntel <intel.com>2013-09-18 12:00:00 +0200
committerThomas Monjalon <thomas.monjalon@6wind.com>2013-10-09 16:16:14 +0200
commitc1f86306a0261f50c503a73fea40293e2b2b724c (patch)
treec48b6e0a1b022fc4fc997cf9860422f832ef606a /lib/librte_pmd_virtio
parent7ef007291004de0bb2a5d298cb11d07a9f9d088e (diff)
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virtio: add new driver
This PMD can be used in a VM having virtio-net NIC. Note: it is a different implementation than virtio-usermap extension. Signed-off-by: Intel
Diffstat (limited to 'lib/librte_pmd_virtio')
-rw-r--r--lib/librte_pmd_virtio/Makefile57
-rw-r--r--lib/librte_pmd_virtio/virtio_ethdev.c636
-rw-r--r--lib/librte_pmd_virtio/virtio_ethdev.h123
-rw-r--r--lib/librte_pmd_virtio/virtio_logs.h70
-rw-r--r--lib/librte_pmd_virtio/virtio_pci.c129
-rw-r--r--lib/librte_pmd_virtio/virtio_pci.h250
-rw-r--r--lib/librte_pmd_virtio/virtio_ring.h163
-rw-r--r--lib/librte_pmd_virtio/virtio_rxtx.c359
-rw-r--r--lib/librte_pmd_virtio/virtqueue.c70
-rw-r--r--lib/librte_pmd_virtio/virtqueue.h362
10 files changed, 2219 insertions, 0 deletions
diff --git a/lib/librte_pmd_virtio/Makefile b/lib/librte_pmd_virtio/Makefile
new file mode 100644
index 0000000..764d8e8
--- /dev/null
+++ b/lib/librte_pmd_virtio/Makefile
@@ -0,0 +1,57 @@
+# BSD LICENSE
+#
+# Copyright(c) 2010-2013 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 $(RTE_SDK)/mk/rte.vars.mk
+
+#
+# library name
+#
+LIB = librte_pmd_virtio.a
+
+CFLAGS += -O3
+CFLAGS += $(WERROR_FLAGS)
+
+
+#
+# all source are stored in SRCS-y
+#
+SRCS-$(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-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += virtio_ethdev.c
+
+
+# this lib depends upon:
+DEPDIRS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += lib/librte_eal lib/librte_ether
+DEPDIRS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += lib/librte_mempool lib/librte_mbuf
+DEPDIRS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += lib/librte_net lib/librte_malloc
+
+include $(RTE_SDK)/mk/rte.lib.mk
diff --git a/lib/librte_pmd_virtio/virtio_ethdev.c b/lib/librte_pmd_virtio/virtio_ethdev.c
new file mode 100644
index 0000000..b5b9d01
--- /dev/null
+++ b/lib/librte_pmd_virtio/virtio_ethdev.c
@@ -0,0 +1,636 @@
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2010-2013 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 <string.h>
+#include <stdio.h>
+#include <errno.h>
+#include <unistd.h>
+
+#include <rte_ethdev.h>
+#include <rte_memcpy.h>
+#include <rte_string_fns.h>
+#include <rte_memzone.h>
+#include <rte_malloc.h>
+#include <rte_atomic.h>
+#include <rte_branch_prediction.h>
+#include <rte_pci.h>
+#include <rte_ether.h>
+#include <rte_common.h>
+
+#include <rte_memory.h>
+#include <rte_eal.h>
+
+#include "virtio_ethdev.h"
+#include "virtio_pci.h"
+#include "virtio_logs.h"
+#include "virtqueue.h"
+
+
+static int eth_virtio_dev_init(struct eth_driver *eth_drv,
+ struct rte_eth_dev *eth_dev);
+static int virtio_dev_configure(struct rte_eth_dev *dev);
+static int virtio_dev_start(struct rte_eth_dev *dev);
+static void virtio_dev_stop(struct rte_eth_dev *dev);
+static void virtio_dev_info_get(struct rte_eth_dev *dev,
+ struct rte_eth_dev_info *dev_info);
+static int virtio_dev_link_update(struct rte_eth_dev *dev,
+ __rte_unused int wait_to_complete);
+
+static void virtio_set_hwaddr(struct virtio_hw *hw);
+static void virtio_get_hwaddr(struct virtio_hw *hw);
+
+static void virtio_dev_rx_queue_release(__rte_unused void *rxq);
+static void virtio_dev_tx_queue_release(__rte_unused void *txq);
+
+static void virtio_dev_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *stats);
+static void virtio_dev_stats_reset(struct rte_eth_dev *dev);
+static void virtio_dev_free_mbufs(struct rte_eth_dev *dev);
+
+/*
+ * The set of PCI devices this driver supports
+ */
+static struct rte_pci_id pci_id_virtio_map[] = {
+
+#define RTE_PCI_DEV_ID_DECL_VIRTIO(vend, dev) {RTE_PCI_DEVICE(vend, dev)},
+#include "rte_pci_dev_ids.h"
+
+{ .vendor_id = 0, /* sentinel */ },
+};
+
+int virtio_dev_queue_setup(struct rte_eth_dev *dev,
+ int queue_type,
+ uint16_t queue_idx,
+ uint8_t vtpci_queue_idx,
+ uint16_t nb_desc,
+ unsigned int socket_id,
+ struct virtqueue **pvq)
+{
+ char vq_name[VIRTQUEUE_MAX_NAME_SZ];
+ const struct rte_memzone *mz;
+ uint16_t vq_size;
+ int size;
+ struct virtio_hw *hw =
+ VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+ struct virtqueue *vq = NULL;
+
+ /* Write the virtqueue index to the Queue Select Field */
+ VIRTIO_WRITE_REG_2(hw, VIRTIO_PCI_QUEUE_SEL, vtpci_queue_idx);
+ PMD_INIT_LOG(DEBUG, "selecting queue: %d\n", vtpci_queue_idx);
+
+ /*
+ * Read the virtqueue size from the Queue Size field
+ * Always power of 2 and if 0 virtqueue does not exist
+ */
+ vq_size = VIRTIO_READ_REG_2(hw, VIRTIO_PCI_QUEUE_NUM);
+ PMD_INIT_LOG(DEBUG, "vq_size: %d nb_desc:%d\n", vq_size, nb_desc);
+ if (nb_desc == 0)
+ nb_desc = vq_size;
+ if (vq_size == 0) {
+ PMD_INIT_LOG(ERR, "%s: virtqueue does not exist\n", __func__);
+ return (-EINVAL);
+ } else if (!rte_is_power_of_2(vq_size)) {
+ PMD_INIT_LOG(ERR, "%s: virtqueue size is not powerof 2\n", __func__);
+ return (-EINVAL);
+ } else if (nb_desc != vq_size) {
+ PMD_INIT_LOG(ERR, "Warning: nb_desc(%d) is not equal to vq size (%d), fall to vq size\n",
+ nb_desc, vq_size);
+ nb_desc = vq_size;
+ }
+
+ if (queue_type == VTNET_RQ) {
+ rte_snprintf(vq_name, sizeof(vq_name), "port%d_rvq%d",
+ dev->data->port_id, queue_idx);
+ vq = rte_zmalloc(vq_name, sizeof(struct virtqueue) +
+ vq_size * sizeof(struct vq_desc_extra), CACHE_LINE_SIZE);
+ strncpy(vq->vq_name, vq_name, sizeof(vq->vq_name));
+ } else if(queue_type == VTNET_TQ) {
+ rte_snprintf(vq_name, sizeof(vq_name), "port%d_tvq%d",
+ dev->data->port_id, queue_idx);
+ vq = rte_zmalloc(vq_name, sizeof(struct virtqueue) +
+ vq_size * sizeof(struct vq_desc_extra), CACHE_LINE_SIZE);
+ strncpy(vq->vq_name, vq_name, sizeof(vq->vq_name));
+ } else if(queue_type == VTNET_CQ) {
+ rte_snprintf(vq_name, sizeof(vq_name), "port%d_cvq",
+ dev->data->port_id);
+ vq = rte_zmalloc(vq_name, sizeof(struct virtqueue),
+ CACHE_LINE_SIZE);
+ strncpy(vq->vq_name, vq_name, sizeof(vq->vq_name));
+ }
+ if (vq == NULL) {
+ PMD_INIT_LOG(ERR, "%s: Can not allocate virtqueue\n", __func__);
+ return (-ENOMEM);
+ }
+ vq->hw = hw;
+ vq->port_id = dev->data->port_id;
+ vq->queue_id = queue_idx;
+ vq->vq_queue_index = vtpci_queue_idx;
+ vq->vq_alignment = VIRTIO_PCI_VRING_ALIGN;
+ vq->vq_nentries = vq_size;
+ vq->vq_free_cnt = vq_size;
+
+ /*
+ * Reserve a memzone for vring elements
+ */
+ size = vring_size(vq_size, VIRTIO_PCI_VRING_ALIGN);
+ vq->vq_ring_size = RTE_ALIGN_CEIL(size, VIRTIO_PCI_VRING_ALIGN);
+ PMD_INIT_LOG(DEBUG, "vring_size: %d, rounded_vring_size: %d\n", size, vq->vq_ring_size);
+
+ mz = rte_memzone_reserve_aligned(vq_name, vq->vq_ring_size,
+ socket_id, 0, VIRTIO_PCI_VRING_ALIGN);
+ if (mz == NULL) {
+ rte_free(vq);
+ return (-ENOMEM);
+ }
+ /*
+ * Virtio PCI device VIRTIO_PCI_QUEUE_PF register is 32bit,
+ * and only accepts 32 bit page frame number.
+ * Check if the allocated physical memory exceeds 16TB.
+ */
+ if ( (mz->phys_addr + vq->vq_ring_size - 1) >> (VIRTIO_PCI_QUEUE_ADDR_SHIFT + 32) ) {
+ PMD_INIT_LOG(ERR, "vring address shouldn't be above 16TB!\n");
+ rte_free(vq);
+ return (-ENOMEM);
+ }
+ memset(mz->addr, 0, sizeof(mz->len));
+ vq->mz = mz;
+ vq->vq_ring_mem = mz->phys_addr;
+ vq->vq_ring_virt_mem = mz->addr;
+ PMD_INIT_LOG(DEBUG, "vq->vq_ring_mem: 0x%"PRIx64"\n", (uint64_t)mz->phys_addr);
+ PMD_INIT_LOG(DEBUG, "vq->vq_ring_virt_mem: 0x%"PRIx64"\n", (uint64_t)mz->addr);
+ vq->virtio_net_hdr_mz = NULL;
+ vq->virtio_net_hdr_mem = (void *)NULL;
+
+ if (queue_type == VTNET_TQ) {
+ /*
+ * For each xmit packet, allocate a virtio_net_hdr
+ */
+ rte_snprintf(vq_name, sizeof(vq_name), "port%d_tvq%d_hdrzone",
+ dev->data->port_id, queue_idx);
+ vq->virtio_net_hdr_mz = rte_memzone_reserve_aligned(vq_name,
+ vq_size * sizeof(struct virtio_net_hdr),
+ socket_id, 0, CACHE_LINE_SIZE);
+ if (vq->virtio_net_hdr_mz == NULL) {
+ rte_free(vq);
+ return (-ENOMEM);
+ }
+ vq->virtio_net_hdr_mem = (void *)(uintptr_t)vq->virtio_net_hdr_mz->phys_addr;
+ memset(vq->virtio_net_hdr_mz->addr, 0, vq_size * sizeof(struct virtio_net_hdr));
+ } else if (queue_type == VTNET_CQ) {
+ /* Allocate a page for control vq command, data and status */
+ rte_snprintf(vq_name, sizeof(vq_name), "port%d_cvq_hdrzone",
+ dev->data->port_id);
+ vq->virtio_net_hdr_mz = rte_memzone_reserve_aligned(vq_name,
+ PAGE_SIZE, socket_id, 0, CACHE_LINE_SIZE);
+ if (vq->virtio_net_hdr_mz == NULL) {
+ rte_free(vq);
+ return (-ENOMEM);
+ }
+ vq->virtio_net_hdr_mem = (void *)(uintptr_t)vq->virtio_net_hdr_mz->phys_addr;
+ memset(vq->virtio_net_hdr_mz->addr, 0, PAGE_SIZE);
+ }
+
+ /*
+ * Set guest physical address of the virtqueue
+ * in VIRTIO_PCI_QUEUE_PFN config register of device
+ */
+ VIRTIO_WRITE_REG_4(hw, VIRTIO_PCI_QUEUE_PFN,
+ mz->phys_addr >> VIRTIO_PCI_QUEUE_ADDR_SHIFT);
+ *pvq = vq;
+ return (0);
+}
+
+static int
+virtio_dev_cq_queue_setup(struct rte_eth_dev *dev,
+ unsigned int socket_id)
+{
+ struct virtqueue *vq;
+ uint16_t nb_desc = 0;
+ int ret;
+ struct virtio_hw *hw =
+ VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+
+ PMD_INIT_FUNC_TRACE();
+ ret = virtio_dev_queue_setup(dev, VTNET_CQ, 0, VTNET_SQ_CQ_QUEUE_IDX,
+ nb_desc, socket_id, &vq);
+ if (ret < 0) {
+ PMD_INIT_LOG(ERR, "control vq initialization failed\n");
+ return ret;
+ }
+
+ hw->cvq = vq;
+ return (0);
+}
+
+/*
+ * dev_ops for virtio, bare necessities for basic operation
+ */
+static struct eth_dev_ops virtio_eth_dev_ops = {
+ .dev_configure = virtio_dev_configure,
+ .dev_start = virtio_dev_start,
+ .dev_stop = virtio_dev_stop,
+
+ .dev_infos_get = virtio_dev_info_get,
+ .stats_get = virtio_dev_stats_get,
+ .stats_reset = virtio_dev_stats_reset,
+ .link_update = virtio_dev_link_update,
+ .mac_addr_add = NULL,
+ .mac_addr_remove = NULL,
+ .rx_queue_setup = virtio_dev_rx_queue_setup,
+ .rx_queue_release = virtio_dev_rx_queue_release, /* meaningfull only to multiple queue */
+ .tx_queue_setup = virtio_dev_tx_queue_setup,
+ .tx_queue_release = virtio_dev_tx_queue_release /* meaningfull only to multiple queue */
+};
+
+static inline int
+virtio_dev_atomic_read_link_status(struct rte_eth_dev *dev,
+ struct rte_eth_link *link)
+{
+ struct rte_eth_link *dst = link;
+ struct rte_eth_link *src = &(dev->data->dev_link);
+
+ if (rte_atomic64_cmpset((uint64_t *)dst, *(uint64_t *)dst,
+ *(uint64_t *)src) == 0)
+ return (-1);
+
+ return (0);
+}
+
+/**
+ * Atomically writes the link status information into global
+ * structure rte_eth_dev.
+ *
+ * @param dev
+ * - Pointer to the structure rte_eth_dev to read from.
+ * - Pointer to the buffer to be saved with the link status.
+ *
+ * @return
+ * - On success, zero.
+ * - On failure, negative value.
+ */
+static inline int
+virtio_dev_atomic_write_link_status(struct rte_eth_dev *dev,
+ struct rte_eth_link *link)
+{
+ struct rte_eth_link *dst = &(dev->data->dev_link);
+ struct rte_eth_link *src = link;
+
+ if (rte_atomic64_cmpset((uint64_t *)dst, *(uint64_t *)dst,
+ *(uint64_t *)src) == 0)
+ return (-1);
+
+ return (0);
+}
+
+static void
+virtio_dev_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *stats)
+{
+ struct virtio_hw *hw =
+ VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+ if(stats)
+ memcpy(stats, &hw->eth_stats, sizeof(*stats));
+}
+
+static void
+virtio_dev_stats_reset(struct rte_eth_dev *dev)
+{
+ struct virtio_hw *hw =
+ VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+ /* Reset software totals */
+ memset(&hw->eth_stats, 0, sizeof(hw->eth_stats));
+}
+
+static void
+virtio_set_hwaddr(struct virtio_hw *hw)
+{
+ vtpci_write_dev_config(hw,
+ offsetof(struct virtio_net_config, mac),
+ &hw->mac_addr, ETHER_ADDR_LEN);
+}
+
+static void
+virtio_get_hwaddr(struct virtio_hw *hw)
+{
+ if (vtpci_with_feature(hw, VIRTIO_NET_F_MAC)) {
+ vtpci_read_dev_config(hw,
+ offsetof(struct virtio_net_config, mac),
+ &hw->mac_addr, ETHER_ADDR_LEN);
+ } else {
+ eth_random_addr(&hw->mac_addr[0]);
+ virtio_set_hwaddr(hw);
+ }
+}
+
+
+static void virtio_negotiate_features(struct virtio_hw *hw)
+{
+ uint64_t guest_features, mask;
+ mask = VIRTIO_NET_F_CTRL_VQ | VIRTIO_NET_F_CTRL_RX | VIRTIO_NET_F_CTRL_VLAN;
+ mask |= VIRTIO_NET_F_CSUM | VIRTIO_NET_F_GUEST_CSUM ;
+
+ /* TSO and LRO are only available when their corresponding
+ * checksum offload feature is also negotiated.
+ */
+ mask |= VIRTIO_NET_F_HOST_TSO4 | VIRTIO_NET_F_HOST_TSO6 | VIRTIO_NET_F_HOST_ECN;
+ mask |= VIRTIO_NET_F_GUEST_TSO4 | VIRTIO_NET_F_GUEST_TSO6 | VIRTIO_NET_F_GUEST_ECN;
+ mask |= VTNET_LRO_FEATURES;
+
+ /* rx_mbuf should not be in multiple merged segments */
+ mask |= VIRTIO_NET_F_MRG_RXBUF;
+
+ /* not negotiating INDIRECT descriptor table support */
+ mask |= VIRTIO_RING_F_INDIRECT_DESC;
+
+ /* Prepare guest_features: feature that driver wants to support */
+ guest_features = VTNET_FEATURES & ~mask;
+
+ /* Read device(host) feature bits */
+ hw->host_features = VIRTIO_READ_REG_4(hw, VIRTIO_PCI_HOST_FEATURES);
+
+ /* Negotiate features: Subset of device feature bits are written back (guest feature bits) */
+ hw->guest_features = vtpci_negotiate_features(hw, guest_features);
+}
+
+/*
+ * This function is based on probe() function in virtio_pci.c
+ * It returns 0 on success.
+ */
+static int
+eth_virtio_dev_init(__rte_unused struct eth_driver *eth_drv,
+ struct rte_eth_dev *eth_dev)
+{
+ struct rte_pci_device *pci_dev;
+ struct virtio_hw *hw =
+ VIRTIO_DEV_PRIVATE_TO_HW(eth_dev->data->dev_private);
+ if (RTE_PKTMBUF_HEADROOM < sizeof(struct virtio_net_hdr) ) {
+ PMD_INIT_LOG(ERR,
+ "MBUF HEADROOM should be enough to hold virtio net hdr\n");
+ return (-1);
+ }
+
+ if (! (rte_eal_get_configuration()->flags & EAL_FLG_HIGH_IOPL)) {
+ PMD_INIT_LOG(ERR,
+ "IOPL call failed in EAL init - cannot use virtio PMD driver\n");
+ return (-1);
+ }
+
+ eth_dev->dev_ops = &virtio_eth_dev_ops;
+ eth_dev->rx_pkt_burst = &virtio_recv_pkts;
+ eth_dev->tx_pkt_burst = &virtio_xmit_pkts;
+
+ if(rte_eal_process_type() == RTE_PROC_SECONDARY)
+ return 0;
+
+ pci_dev = eth_dev->pci_dev;
+
+ hw->device_id = pci_dev->id.device_id;
+ hw->vendor_id = pci_dev->id.vendor_id;
+ hw->io_base = (uint32_t)(uintptr_t)pci_dev->mem_resource[0].addr;
+
+ hw->max_rx_queues = VIRTIO_MAX_RX_QUEUES;
+ hw->max_tx_queues = VIRTIO_MAX_TX_QUEUES;
+
+ /* Reset the device although not necessary at startup */
+ vtpci_reset(hw);
+
+ /* Tell the host we've noticed this device. */
+ vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_ACK);
+
+ /* Tell the host we've known how to drive the device. */
+ vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_DRIVER);
+ virtio_negotiate_features(hw);
+ /* Setting up rx_header size for the device */
+ if(vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF))
+ hw->vtnet_hdr_size = sizeof(struct virtio_net_hdr_mrg_rxbuf);
+ else
+ hw->vtnet_hdr_size = sizeof(struct virtio_net_hdr);
+
+ /* Allocate memory for storing MAC addresses */
+ eth_dev->data->mac_addrs = rte_zmalloc("virtio", ETHER_ADDR_LEN, 0);
+ if (eth_dev->data->mac_addrs == NULL) {
+ PMD_INIT_LOG(ERR,
+ "Failed to allocate %d bytes needed to store MAC addresses",
+ ETHER_ADDR_LEN);
+ return (-ENOMEM);
+ }
+ /* Copy the permanent MAC address to: virtio_hw */
+ virtio_get_hwaddr(hw);
+ ether_addr_copy((struct ether_addr *) hw->mac_addr,
+ &eth_dev->data->mac_addrs[0]);
+ PMD_INIT_LOG(DEBUG, "PORT MAC: %02X:%02X:%02X:%02X:%02X:%02X\n", hw->mac_addr[0],
+ hw->mac_addr[1],hw->mac_addr[2], hw->mac_addr[3], hw->mac_addr[4], hw->mac_addr[5]);
+
+ if(vtpci_with_feature(hw, VIRTIO_NET_F_CTRL_VQ))
+ virtio_dev_cq_queue_setup(eth_dev, SOCKET_ID_ANY);
+
+ PMD_INIT_LOG(DEBUG, "port %d vendorID=0x%x deviceID=0x%x",
+ eth_dev->data->port_id, pci_dev->id.vendor_id,
+ pci_dev->id.device_id);
+ return (0);
+}
+
+static struct eth_driver rte_virtio_pmd = {
+ {
+ .name = "rte_virtio_pmd",
+ .id_table = pci_id_virtio_map,
+#ifdef RTE_EAL_UNBIND_PORTS
+ .drv_flags = RTE_PCI_DRV_NEED_IGB_UIO,
+#endif
+ },
+ .eth_dev_init = eth_virtio_dev_init,
+ .dev_private_size = sizeof(struct virtio_adapter),
+};
+
+/*
+ * Driver initialization routine.
+ * Invoked once at EAL init time.
+ * Register itself as the [Poll Mode] Driver of PCI virtio devices.
+ * Returns 0 on success.
+ */
+int
+rte_virtio_pmd_init(void)
+{
+ rte_eth_driver_register(&rte_virtio_pmd);
+ return (0);
+}
+
+/*
+ * Only 1 queue is supported, no queue release related operation
+ */
+static void
+virtio_dev_rx_queue_release(__rte_unused void *rxq)
+{
+}
+
+static void
+virtio_dev_tx_queue_release(__rte_unused void *txq)
+{
+}
+
+/*
+ * Configure virtio device
+ * It returns 0 on success.
+ */
+static int
+virtio_dev_configure(__rte_unused struct rte_eth_dev *dev)
+{
+ return (0);
+}
+
+
+static int
+virtio_dev_start(struct rte_eth_dev *dev)
+{
+ uint16_t status;
+ struct virtio_hw *hw =
+ VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+
+ /* Tell the host we've noticed this device. */
+ vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_ACK);
+
+ /* Tell the host we've known how to drive the device. */
+ vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_DRIVER);
+
+ hw->adapter_stopped = 0;
+
+ /* Do final configuration before rx/tx engine starts */
+ virtio_dev_rxtx_start(dev);
+
+ /* Check VIRTIO_NET_F_STATUS for link status*/
+ if(vtpci_with_feature(hw, VIRTIO_NET_F_STATUS)) {
+
+ vtpci_read_dev_config(hw,
+ offsetof(struct virtio_net_config, status),
+ &status, sizeof(status));
+ if((status & VIRTIO_NET_S_LINK_UP) == 0) {
+ PMD_INIT_LOG(ERR, "Port: %d Link is DOWN\n", dev->data->port_id);
+ return (-EIO);
+ } else {
+ PMD_INIT_LOG(DEBUG, "Port: %d Link is UP\n", dev->data->port_id);
+ }
+ }
+ vtpci_reinit_complete(hw);
+
+ /*Notify the backend
+ *Otherwise the tap backend might already stop its queue due to fullness.
+ *vhost backend will have no chance to be waked up
+ */
+ virtqueue_notify(dev->data->rx_queues[0]);
+ PMD_INIT_LOG(DEBUG, "Notified backend at initialization\n");
+ return (0);
+}
+
+static void virtio_dev_free_mbufs(struct rte_eth_dev *dev)
+{
+ struct rte_mbuf * buf;
+ int i = 0;
+ PMD_INIT_LOG(DEBUG, "Before freeing rxq used and unused buf \n");
+ VIRTQUEUE_DUMP((struct virtqueue *)dev->data->rx_queues[0]);
+ while( (buf =(struct rte_mbuf *)virtqueue_detatch_unused(dev->data->rx_queues[0])) != NULL) {
+ rte_pktmbuf_free_seg(buf);
+ i++;
+ }
+ PMD_INIT_LOG(DEBUG, "free %d mbufs\n", i);
+ PMD_INIT_LOG(DEBUG, "After freeing rxq used and unused buf\n");
+ VIRTQUEUE_DUMP((struct virtqueue *)dev->data->rx_queues[0]);
+ PMD_INIT_LOG(DEBUG, "Before freeing txq used and unused bufs\n");
+ VIRTQUEUE_DUMP((struct virtqueue *)dev->data->tx_queues[0]);
+ i = 0;
+ while( (buf = (struct rte_mbuf *)virtqueue_detatch_unused(dev->data->tx_queues[0])) != NULL) {
+ rte_pktmbuf_free_seg(buf);
+ i++;
+ }
+ PMD_INIT_LOG(DEBUG, "free %d mbufs\n", i);
+ PMD_INIT_LOG(DEBUG, "After freeing txq used and unused buf\n");
+ VIRTQUEUE_DUMP((struct virtqueue *)dev->data->tx_queues[0]);
+}
+
+/*
+ * Stop device: disable rx and tx functions to allow for reconfiguring.
+ */
+static void
+virtio_dev_stop(struct rte_eth_dev *dev)
+{
+ struct virtio_hw *hw =
+ VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+
+ /* reset the NIC */
+ vtpci_reset(hw);
+ virtio_dev_free_mbufs(dev);
+}
+
+static int
+virtio_dev_link_update(struct rte_eth_dev *dev, __rte_unused int wait_to_complete)
+{
+ struct rte_eth_link link, old;
+ uint16_t status;
+ struct virtio_hw *hw =
+ VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+ memset(&link, 0, sizeof(link));
+ virtio_dev_atomic_read_link_status(dev, &link);
+ old = link;
+ link.link_duplex = FULL_DUPLEX ;
+ link.link_speed = SPEED_10G ;
+ if(vtpci_with_feature(hw, VIRTIO_NET_F_STATUS)) {
+ PMD_INIT_LOG(DEBUG, "Get link status from hw\n");
+ vtpci_read_dev_config(hw,
+ offsetof(struct virtio_net_config, status),
+ &status, sizeof(status));
+ if((status & VIRTIO_NET_S_LINK_UP) == 0) {
+ link.link_status = 0;
+ PMD_INIT_LOG(DEBUG, "Port %d is down\n",dev->data->port_id);
+ } else {
+ link.link_status = 1;
+ PMD_INIT_LOG(DEBUG, "Port %d is up\n",dev->data->port_id);
+ }
+ } else {
+ link.link_status = 1; //Link up
+ }
+ virtio_dev_atomic_write_link_status(dev, &link);
+ if(old.link_status == link.link_status)
+ return (-1);
+ /*changed*/
+ return (0);
+}
+
+static void
+virtio_dev_info_get(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
+{
+ struct virtio_hw *hw = VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+ dev_info->driver_name = dev->driver->pci_drv.name;
+ dev_info->max_rx_queues = (uint16_t)hw->max_rx_queues;
+ dev_info->max_tx_queues = (uint16_t)hw->max_tx_queues;
+ dev_info->min_rx_bufsize = VIRTIO_MIN_RX_BUFSIZE;
+ dev_info->max_rx_pktlen = VIRTIO_MAX_RX_PKTLEN;
+ dev_info->max_mac_addrs = VIRTIO_MAX_MAC_ADDRS;
+}
diff --git a/lib/librte_pmd_virtio/virtio_ethdev.h b/lib/librte_pmd_virtio/virtio_ethdev.h
new file mode 100644
index 0000000..d9b0a07
--- /dev/null
+++ b/lib/librte_pmd_virtio/virtio_ethdev.h
@@ -0,0 +1,123 @@
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2010-2013 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.
+ */
+
+#ifndef _VIRTIO_ETHDEV_H_
+#define _VIRTIO_ETHDEV_H_
+
+#include <stdint.h>
+
+#include "virtio_pci.h"
+
+#define SPEED_10 10
+#define SPEED_100 100
+#define SPEED_1000 1000
+#define SPEED_10G 10000
+#define HALF_DUPLEX 1
+#define FULL_DUPLEX 2
+
+#ifndef PAGE_SIZE
+#define PAGE_SIZE 4096
+#endif
+
+#define VIRTIO_MAX_RX_QUEUES 1
+#define VIRTIO_MAX_TX_QUEUES 1
+#define VIRTIO_MAX_MAC_ADDRS 1
+#define VIRTIO_MIN_RX_BUFSIZE 64
+#define VIRTIO_MAX_RX_PKTLEN 1518
+
+/* Features desired/implemented by this driver. */
+#define VTNET_FEATURES \
+ (VIRTIO_NET_F_MAC | \
+ VIRTIO_NET_F_STATUS | \
+ VIRTIO_NET_F_CTRL_VQ | \
+ VIRTIO_NET_F_CTRL_RX | \
+ VIRTIO_NET_F_CTRL_VLAN | \
+ VIRTIO_NET_F_CSUM | \
+ VIRTIO_NET_F_HOST_TSO4 | \
+ VIRTIO_NET_F_HOST_TSO6 | \
+ VIRTIO_NET_F_HOST_ECN | \
+ VIRTIO_NET_F_GUEST_CSUM | \
+ VIRTIO_NET_F_GUEST_TSO4 | \
+ VIRTIO_NET_F_GUEST_TSO6 | \
+ VIRTIO_NET_F_GUEST_ECN | \
+ VIRTIO_NET_F_MRG_RXBUF | \
+ VIRTIO_RING_F_INDIRECT_DESC)
+
+/*
+ * RX/TX function prototypes
+ */
+void virtio_dev_rxtx_start(struct rte_eth_dev *dev);
+
+int virtio_dev_queue_setup(struct rte_eth_dev *dev,
+ int queue_type,
+ uint16_t queue_idx,
+ uint8_t vtpci_queue_idx,
+ uint16_t nb_desc,
+ unsigned int socket_id,
+ struct virtqueue **pvq);
+
+int virtio_dev_rx_queue_setup(struct rte_eth_dev *dev, uint16_t rx_queue_id,
+ uint16_t nb_rx_desc, unsigned int socket_id,
+ const struct rte_eth_rxconf *rx_conf,
+ struct rte_mempool *mb_pool);
+
+int virtio_dev_tx_queue_setup(struct rte_eth_dev *dev, uint16_t tx_queue_id,
+ uint16_t nb_tx_desc, unsigned int socket_id,
+ const struct rte_eth_txconf *tx_conf);
+
+uint16_t virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
+ uint16_t nb_pkts);
+
+uint16_t virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
+ uint16_t nb_pkts);
+
+/*
+ * Structure to store private data for each driver instance (for each port).
+ */
+struct virtio_adapter {
+ struct virtio_hw hw;
+};
+
+#define VIRTIO_DEV_PRIVATE_TO_HW(adapter)\
+ (&((struct virtio_adapter *)adapter)->hw)
+
+/*
+ * The VIRTIO_NET_F_GUEST_TSO[46] features permit the host to send us
+ * frames larger than 1514 bytes. We do not yet support software LRO
+ * via tcp_lro_rx().
+ */
+#define VTNET_LRO_FEATURES (VIRTIO_NET_F_GUEST_TSO4 | \
+ VIRTIO_NET_F_GUEST_TSO6 | VIRTIO_NET_F_GUEST_ECN)
+
+
+#endif /* _VIRTIO_ETHDEV_H_ */
diff --git a/lib/librte_pmd_virtio/virtio_logs.h b/lib/librte_pmd_virtio/virtio_logs.h
new file mode 100644
index 0000000..f70b884
--- /dev/null
+++ b/lib/librte_pmd_virtio/virtio_logs.h
@@ -0,0 +1,70 @@
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2010-2013 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.
+ */
+
+#ifndef _VIRTIO_LOGS_H_
+#define _VIRTIO_LOGS_H_
+
+#include <rte_log.h>
+
+#ifdef RTE_LIBRTE_VIRTIO_DEBUG_INIT
+#define PMD_INIT_LOG(level, fmt, args...) \
+ RTE_LOG(level, PMD, "%s(): " fmt "\n", __func__, ## args)
+#define PMD_INIT_FUNC_TRACE() PMD_INIT_LOG(DEBUG, " >>")
+#else
+#define PMD_INIT_LOG(level, fmt, args...) do { } while(0)
+#define PMD_INIT_FUNC_TRACE() do { } while(0)
+#endif
+
+#ifdef RTE_LIBRTE_VIRTIO_DEBUG_RX
+#define PMD_RX_LOG(level, fmt, args...) \
+ RTE_LOG(level, PMD, "%s() rx: " fmt , __func__, ## args)
+#else
+#define PMD_RX_LOG(level, fmt, args...) do { } while(0)
+#endif
+
+#ifdef RTE_LIBRTE_VIRTIO_DEBUG_TX
+#define PMD_TX_LOG(level, fmt, args...) \
+ RTE_LOG(level, PMD, "%s() tx: " fmt , __func__, ## args)
+#else
+#define PMD_TX_LOG(level, fmt, args...) do { } while(0)
+#endif
+
+
+#ifdef RTE_LIBRTE_VIRTIO_DEBUG_DRIVER
+#define PMD_DRV_LOG(level, fmt, args...) \
+ RTE_LOG(level, PMD, "%s(): " fmt , __func__, ## args)
+#else
+#define PMD_DRV_LOG(level, fmt, args...) do { } while(0)
+#endif
+
+#endif /* _VIRTIO_LOGS_H_ */
diff --git a/lib/librte_pmd_virtio/virtio_pci.c b/lib/librte_pmd_virtio/virtio_pci.c
new file mode 100644
index 0000000..a462779
--- /dev/null
+++ b/lib/librte_pmd_virtio/virtio_pci.c
@@ -0,0 +1,129 @@
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2010-2013 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 "virtio_pci.h"
+#include "virtio_logs.h"
+
+void
+vtpci_read_dev_config(struct virtio_hw *hw, uint64_t offset,
+ void *dst, int length)
+{
+ uint64_t off;
+ uint8_t *d;
+ int size;
+
+ off = VIRTIO_PCI_CONFIG(hw) + offset;
+ for (d = dst; length > 0; d += size, off += size, length -= size) {
+ if (length >= 4) {
+ size = 4;
+ *(uint32_t *)d = VIRTIO_READ_REG_4(hw, off);
+ } else if (length >= 2) {
+ size = 2;
+ *(uint16_t *)d = VIRTIO_READ_REG_2(hw, off);
+ } else {
+ size = 1;
+ *d = VIRTIO_READ_REG_1(hw, off);
+ }
+ }
+}
+
+void
+vtpci_write_dev_config(struct virtio_hw *hw, uint64_t offset,
+ void *src, int length)
+{
+ uint64_t off;
+ uint8_t *s;
+ int size;
+
+ off = VIRTIO_PCI_CONFIG(hw) + offset;
+ for (s = src; length > 0; s += size, off += size, length -= size) {
+ if (length >= 4) {
+ size = 4;
+ VIRTIO_WRITE_REG_4(hw, off, *(uint32_t *)s);
+ } else if (length >= 2) {
+ size = 2;
+ VIRTIO_WRITE_REG_2(hw, off, *(uint16_t *)s);
+ } else {
+ size = 1;
+ VIRTIO_WRITE_REG_1(hw, off, *s);
+ }
+ }
+}
+
+uint64_t
+vtpci_negotiate_features(struct virtio_hw *hw, uint64_t guest_features)
+{
+ uint32_t features;
+ /*
+ * Limit negotiated features to what the driver, virtqueue, and
+ * host all support.
+ */
+ features = (hw->host_features) & guest_features;
+
+ VIRTIO_WRITE_REG_4(hw, VIRTIO_PCI_GUEST_FEATURES, features);
+ return (features);
+}
+
+
+void
+vtpci_reset(struct virtio_hw *hw)
+{
+ /*
+ * Setting the status to RESET sets the host device to
+ * the original, uninitialized state.
+ */
+ vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_RESET);
+ vtpci_get_status(hw);
+}
+
+void
+vtpci_reinit_complete(struct virtio_hw *hw)
+{
+ vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_DRIVER_OK);
+}
+
+uint8_t
+vtpci_get_status(struct virtio_hw *hw)
+{
+ return (VIRTIO_READ_REG_1(hw, VIRTIO_PCI_STATUS));
+}
+
+void
+vtpci_set_status(struct virtio_hw *hw, uint8_t status)
+{
+ if (status != VIRTIO_CONFIG_STATUS_RESET)
+ status = (uint8_t)(status | vtpci_get_status(hw));
+
+ VIRTIO_WRITE_REG_1(hw, VIRTIO_PCI_STATUS, status);
+}
diff --git a/lib/librte_pmd_virtio/virtio_pci.h b/lib/librte_pmd_virtio/virtio_pci.h
new file mode 100644
index 0000000..04fc156
--- /dev/null
+++ b/lib/librte_pmd_virtio/virtio_pci.h
@@ -0,0 +1,250 @@
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2010-2013 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.
+ */
+
+#ifndef _VIRTIO_PCI_H_
+#define _VIRTIO_PCI_H_
+
+#include <stdint.h>
+#include <sys/io.h>
+
+#include <rte_ethdev.h>
+
+struct virtqueue;
+
+/* VirtIO PCI vendor/device ID. */
+#define VIRTIO_PCI_VENDORID 0x1AF4
+#define VIRTIO_PCI_DEVICEID_MIN 0x1000
+#define VIRTIO_PCI_DEVICEID_MAX 0x103F
+
+/* VirtIO ABI version, this must match exactly. */
+#define VIRTIO_PCI_ABI_VERSION 0
+
+/*
+ * VirtIO Header, located in BAR 0.
+ */
+#define VIRTIO_PCI_HOST_FEATURES 0 /* host's supported features (32bit, RO)*/
+#define VIRTIO_PCI_GUEST_FEATURES 4 /* guest's supported features (32, RW) */
+#define VIRTIO_PCI_QUEUE_PFN 8 /* physical address of VQ (32, RW) */
+#define VIRTIO_PCI_QUEUE_NUM 12 /* number of ring entries (16, RO) */
+#define VIRTIO_PCI_QUEUE_SEL 14 /* current VQ selection (16, RW) */
+#define VIRTIO_PCI_QUEUE_NOTIFY 16 /* notify host regarding VQ (16, RW) */
+#define VIRTIO_PCI_STATUS 18 /* device status register (8, RW) */
+#define VIRTIO_PCI_ISR 19 /* interrupt status register, reading
+ * also clears the register (8, RO) */
+/* Only if MSIX is enabled: */
+#define VIRTIO_MSI_CONFIG_VECTOR 20 /* configuration change vector (16, RW) */
+#define VIRTIO_MSI_QUEUE_VECTOR 22 /* vector for selected VQ notifications
+ (16, RW) */
+
+/* The bit of the ISR which indicates a device has an interrupt. */
+#define VIRTIO_PCI_ISR_INTR 0x1
+/* The bit of the ISR which indicates a device configuration change. */
+#define VIRTIO_PCI_ISR_CONFIG 0x2
+/* Vector value used to disable MSI for queue. */
+#define VIRTIO_MSI_NO_VECTOR 0xFFFF
+
+/* VirtIO device IDs. */
+#define VIRTIO_ID_NETWORK 0x01
+#define VIRTIO_ID_BLOCK 0x02
+#define VIRTIO_ID_CONSOLE 0x03
+#define VIRTIO_ID_ENTROPY 0x04
+#define VIRTIO_ID_BALLOON 0x05
+#define VIRTIO_ID_IOMEMORY 0x06
+#define VIRTIO_ID_9P 0x09
+
+/* Status byte for guest to report progress. */
+#define VIRTIO_CONFIG_STATUS_RESET 0x00
+#define VIRTIO_CONFIG_STATUS_ACK 0x01
+#define VIRTIO_CONFIG_STATUS_DRIVER 0x02
+#define VIRTIO_CONFIG_STATUS_DRIVER_OK 0x04
+#define VIRTIO_CONFIG_STATUS_FAILED 0x80
+
+/*
+ * Generate interrupt when the virtqueue ring is
+ * completely used, even if we've suppressed them.
+ */
+#define VIRTIO_F_NOTIFY_ON_EMPTY (1 << 24)
+
+/*
+ * The guest should never negotiate this feature; it
+ * is used to detect faulty drivers.
+ */
+#define VIRTIO_F_BAD_FEATURE (1 << 30)
+
+/*
+ * Some VirtIO feature bits (currently bits 28 through 31) are
+ * reserved for the transport being used (eg. virtio_ring), the
+ * rest are per-device feature bits.
+ */
+#define VIRTIO_TRANSPORT_F_START 28
+#define VIRTIO_TRANSPORT_F_END 32
+
+/*
+ * Each virtqueue indirect descriptor list must be physically contiguous.
+ * To allow us to malloc(9) each list individually, limit the number
+ * supported to what will fit in one page. With 4KB pages, this is a limit
+ * of 256 descriptors. If there is ever a need for more, we can switch to
+ * contigmalloc(9) for the larger allocations, similar to what
+ * bus_dmamem_alloc(9) does.
+ *
+ * Note the sizeof(struct vring_desc) is 16 bytes.
+ */
+#define VIRTIO_MAX_INDIRECT ((int) (PAGE_SIZE / 16))
+
+/* The feature bitmap for virtio net */
+#define VIRTIO_NET_F_CSUM 0x00001 /* Host handles pkts w/ partial csum */
+#define VIRTIO_NET_F_GUEST_CSUM 0x00002 /* Guest handles pkts w/ partial csum*/
+#define VIRTIO_NET_F_MAC 0x00020 /* Host has given MAC address. */
+#define VIRTIO_NET_F_GSO 0x00040 /* Host handles pkts w/ any GSO type */
+#define VIRTIO_NET_F_GUEST_TSO4 0x00080 /* Guest can handle TSOv4 in. */
+#define VIRTIO_NET_F_GUEST_TSO6 0x00100 /* Guest can handle TSOv6 in. */
+#define VIRTIO_NET_F_GUEST_ECN 0x00200 /* Guest can handle TSO[6] w/ ECN in.*/
+#define VIRTIO_NET_F_GUEST_UFO 0x00400 /* Guest can handle UFO in. */
+#define VIRTIO_NET_F_HOST_TSO4 0x00800 /* Host can handle TSOv4 in. */
+#define VIRTIO_NET_F_HOST_TSO6 0x01000 /* Host can handle TSOv6 in. */
+#define VIRTIO_NET_F_HOST_ECN 0x02000 /* Host can handle TSO[6] w/ ECN in. */
+#define VIRTIO_NET_F_HOST_UFO 0x04000 /* Host can handle UFO in. */
+#define VIRTIO_NET_F_MRG_RXBUF 0x08000 /* Host can merge receive buffers. */
+#define VIRTIO_NET_F_STATUS 0x10000 /* virtio_net_config.status available*/
+#define VIRTIO_NET_F_CTRL_VQ 0x20000 /* Control channel available */
+#define VIRTIO_NET_F_CTRL_RX 0x40000 /* Control channel RX mode support */
+#define VIRTIO_NET_F_CTRL_VLAN 0x80000 /* Control channel VLAN filtering */
+#define VIRTIO_NET_F_CTRL_RX_EXTRA 0x100000 /* Extra RX mode control support */
+#define VIRTIO_RING_F_INDIRECT_DESC 0x10000000 /* Support for indirect buffer descriptors. */
+/* The guest publishes the used index for which it expects an interrupt
+ * at the end of the avail ring. Host should ignore the avail->flags field.
+ * The host publishes the avail index for which it expects a kick
+ * at the end of the used ring. Guest should ignore the used->flags field.
+ */
+#define VIRTIO_RING_F_EVENT_IDX 0x20000000
+
+#define VIRTIO_NET_S_LINK_UP 1 /* Link is up */
+
+/*
+ * Maximum number of virtqueues per device.
+ */
+#define VIRTIO_MAX_VIRTQUEUES 8
+
+struct virtio_hw {
+ uint32_t io_base;
+ uint32_t host_features;
+ uint32_t guest_features;
+
+ struct virtqueue *cvq;
+
+ uint16_t vtnet_hdr_size;
+
+ uint32_t max_tx_queues;
+ uint32_t max_rx_queues;
+ uint16_t device_id;
+ uint16_t vendor_id;
+ uint16_t subsystem_device_id;
+ uint16_t subsystem_vendor_id;
+ uint8_t revision_id;
+ uint8_t mac_addr[ETHER_ADDR_LEN];
+ int adapter_stopped;
+ struct rte_eth_stats eth_stats;
+};
+
+/*
+ * This structure is just a reference to read
+ * net device specific config space; it just a chodu structure
+ *
+ */
+struct virtio_net_config {
+ /* The config defining mac address (if VIRTIO_NET_F_MAC) */
+ uint8_t mac[ETHER_ADDR_LEN];
+ /* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */
+ uint16_t status;
+};
+/* Value indicated in device config */
+#define VIRTIO_PCI_FLAG_MSIX 0x0020
+/*
+ * The remaining space is defined by each driver as the per-driver
+ * configuration space.
+ */
+#define VIRTIO_PCI_CONFIG(hw) (((hw)->guest_features & VIRTIO_PCI_FLAG_MSIX) ? 24 : 20)
+
+/*
+ * How many bits to shift physical queue address written to QUEUE_PFN.
+ * 12 is historical, and due to x86 page size.
+ */
+#define VIRTIO_PCI_QUEUE_ADDR_SHIFT 12
+
+/* The alignment to use between consumer and producer parts of vring. */
+#define VIRTIO_PCI_VRING_ALIGN 4096
+
+#define VIRTIO_PCI_REG_ADDR(hw, reg) \
+ (unsigned short)((hw)->io_base + (reg))
+
+#define VIRTIO_READ_REG_1(hw, reg) \
+ inb((VIRTIO_PCI_REG_ADDR((hw), (reg))))
+#define VIRTIO_WRITE_REG_1(hw, reg, value) \
+ outb_p((unsigned char)(value), (VIRTIO_PCI_REG_ADDR((hw), (reg))))
+
+#define VIRTIO_READ_REG_2(hw, reg) \
+ inw((VIRTIO_PCI_REG_ADDR((hw), (reg))))
+#define VIRTIO_WRITE_REG_2(hw, reg, value) \
+ outw_p((unsigned short)(value), (VIRTIO_PCI_REG_ADDR((hw), (reg))))
+
+#define VIRTIO_READ_REG_4(hw, reg) \
+ inl((VIRTIO_PCI_REG_ADDR((hw), (reg))))
+#define VIRTIO_WRITE_REG_4(hw, reg, value) \
+ outl_p((unsigned int)(value), (VIRTIO_PCI_REG_ADDR((hw), (reg))))
+
+static inline int
+vtpci_with_feature(struct virtio_hw *hw, uint64_t feature)
+{
+ return ((hw->guest_features & feature) != 0);
+}
+
+/*
+ * Function declaration from virtio_pci.c
+ */
+void vtpci_reset(struct virtio_hw *);
+
+void vtpci_reinit_complete(struct virtio_hw *);
+
+uint8_t vtpci_get_status(struct virtio_hw *);
+
+void vtpci_set_status(struct virtio_hw *, uint8_t);
+
+int vtpci_with_feature(struct virtio_hw *, uint64_t);
+
+uint64_t vtpci_negotiate_features(struct virtio_hw *, uint64_t);
+
+void vtpci_write_dev_config(struct virtio_hw *, uint64_t, void *, int);
+
+void vtpci_read_dev_config(struct virtio_hw *, uint64_t, void *, int);
+
+#endif /* _VIRTIO_PCI_H_ */
diff --git a/lib/librte_pmd_virtio/virtio_ring.h b/lib/librte_pmd_virtio/virtio_ring.h
new file mode 100644
index 0000000..97ac398
--- /dev/null
+++ b/lib/librte_pmd_virtio/virtio_ring.h
@@ -0,0 +1,163 @@
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2010-2013 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.
+ */
+
+#ifndef _VIRTIO_RING_H_
+#define _VIRTIO_RING_H_
+
+#include <stdint.h>
+
+#include <rte_common.h>
+
+/* This marks a buffer as continuing via the next field. */
+#define VRING_DESC_F_NEXT 1
+/* This marks a buffer as write-only (otherwise read-only). */
+#define VRING_DESC_F_WRITE 2
+/* This means the buffer contains a list of buffer descriptors. */
+#define VRING_DESC_F_INDIRECT 4
+
+/* The Host uses this in used->flags to advise the Guest: don't kick me
+ * when you add a buffer. It's unreliable, so it's simply an
+ * optimization. Guest will still kick if it's out of buffers. */
+#define VRING_USED_F_NO_NOTIFY 1
+/* The Guest uses this in avail->flags to advise the Host: don't
+ * interrupt me when you consume a buffer. It's unreliable, so it's
+ * simply an optimization. */
+#define VRING_AVAIL_F_NO_INTERRUPT 1
+
+/* VirtIO ring descriptors: 16 bytes.
+ * These can chain together via "next". */
+struct vring_desc {
+ uint64_t addr; /* Address (guest-physical). */
+ uint32_t len; /* Length. */
+ uint16_t flags; /* The flags as indicated above. */
+ uint16_t next; /* We chain unused descriptors via this. */
+};
+
+struct vring_avail {
+ uint16_t flags;
+ uint16_t idx;
+ uint16_t ring[0];
+};
+
+/* id is a 16bit index. uint32_t is used here for ids for padding reasons. */
+struct vring_used_elem {
+ /* Index of start of used descriptor chain. */
+ uint32_t id;
+ /* Total length of the descriptor chain which was written to. */
+ uint32_t len;
+};
+
+struct vring_used {
+ uint16_t flags;
+ uint16_t idx;
+ struct vring_used_elem ring[0];
+};
+
+struct vring {
+ unsigned int num;
+ struct vring_desc *desc;
+ struct vring_avail *avail;
+ struct vring_used *used;
+};
+
+/* The standard layout for the ring is a continuous chunk of memory which
+ * looks like this. We assume num is a power of 2.
+ *
+ * struct vring {
+ * // The actual descriptors (16 bytes each)
+ * struct vring_desc desc[num];
+ *
+ * // A ring of available descriptor heads with free-running index.
+ * __u16 avail_flags;
+ * __u16 avail_idx;
+ * __u16 available[num];
+ * __u16 used_event_idx;
+ *
+ * // Padding to the next align boundary.
+ * char pad[];
+ *
+ * // A ring of used descriptor heads with free-running index.
+ * __u16 used_flags;
+ * __u16 used_idx;
+ * struct vring_used_elem used[num];
+ * __u16 avail_event_idx;
+ * };
+ *
+ * NOTE: for VirtIO PCI, align is 4096.
+ */
+
+/*
+ * We publish the used event index at the end of the available ring, and vice
+ * versa. They are at the end for backwards compatibility.
+ */
+#define vring_used_event(vr) ((vr)->avail->ring[(vr)->num])
+#define vring_avail_event(vr) (*(uint16_t *)&(vr)->used->ring[(vr)->num])
+
+static inline int
+vring_size(unsigned int num, unsigned long align)
+{
+ int size;
+
+ size = num * sizeof(struct vring_desc);
+ size += sizeof(struct vring_avail) + (num * sizeof(uint16_t));
+ size = RTE_ALIGN_CEIL(size, align);
+ size += sizeof(struct vring_used) +
+ (num * sizeof(struct vring_used_elem));
+ return (size);
+}
+
+static inline void
+vring_init(struct vring *vr, unsigned int num, uint8_t *p,
+ unsigned long align)
+{
+ vr->num = num;
+ vr->desc = (struct vring_desc *) p;
+ vr->avail = (struct vring_avail *) (p +
+ num * sizeof(struct vring_desc));
+ vr->used = (void *)
+ RTE_ALIGN_CEIL( (uintptr_t)(&vr->avail->ring[num]), align);
+}
+
+/*
+ * The following is used with VIRTIO_RING_F_EVENT_IDX.
+ * Assuming a given event_idx value from the other size, if we have
+ * just incremented index from old to new_idx, should we trigger an
+ * event?
+ */
+static inline int
+vring_need_event(uint16_t event_idx, uint16_t new_idx, uint16_t old)
+{
+ return (uint16_t)(new_idx - event_idx - 1) < (uint16_t)(new_idx - old);
+}
+
+#endif /* _VIRTIO_RING_H_ */
diff --git a/lib/librte_pmd_virtio/virtio_rxtx.c b/lib/librte_pmd_virtio/virtio_rxtx.c
new file mode 100644
index 0000000..05e1721
--- /dev/null
+++ b/lib/librte_pmd_virtio/virtio_rxtx.c
@@ -0,0 +1,359 @@
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2010-2013 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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include <rte_memory.h>
+#include <rte_memzone.h>
+#include <rte_branch_prediction.h>
+#include <rte_mempool.h>
+#include <rte_malloc.h>
+#include <rte_mbuf.h>
+#include <rte_ether.h>
+#include <rte_ethdev.h>
+#include <rte_prefetch.h>
+#include <rte_string_fns.h>
+#include <rte_errno.h>
+
+#include "virtio_logs.h"
+#include "virtio_ethdev.h"
+#include "virtqueue.h"
+
+#ifdef RTE_LIBRTE_VIRTIO_DEBUG_DUMP
+#define VIRTIO_DUMP_PACKET(m, len) rte_pktmbuf_dump(m, len)
+#else
+#define VIRTIO_DUMP_PACKET(m, len) do { } while (0)
+#endif
+
+static inline struct rte_mbuf *
+rte_rxmbuf_alloc(struct rte_mempool *mp)
+{
+ struct rte_mbuf *m;
+
+ m = __rte_mbuf_raw_alloc(mp);
+ __rte_mbuf_sanity_check_raw(m, RTE_MBUF_PKT, 0);
+
+ return (m);
+}
+
+static void
+virtio_dev_vring_start(struct rte_eth_dev *dev, struct virtqueue *vq, int queue_type)
+{
+ struct rte_mbuf *m;
+ int i, nbufs, error, size = vq->vq_nentries;
+ struct vring *vr = &vq->vq_ring;
+ uint8_t *ring_mem = vq->vq_ring_virt_mem;
+ char vq_name[VIRTQUEUE_MAX_NAME_SZ];
+ PMD_INIT_FUNC_TRACE();
+
+ /*
+ * Reinitialise since virtio port might have been stopped and restarted
+ */
+ memset(vq->vq_ring_virt_mem, 0, vq->vq_ring_size);
+ vring_init(vr, size, ring_mem, vq->vq_alignment);
+ vq->vq_used_cons_idx = 0;
+ vq->vq_desc_head_idx = 0;
+ vq->vq_free_cnt = vq->vq_nentries;
+ memset(vq->vq_descx, 0, sizeof(struct vq_desc_extra) * vq->vq_nentries);
+
+ /* Chain all the descriptors in the ring with an END */
+ for (i = 0; i < size - 1; i++)
+ vr->desc[i].next = (uint16_t)(i + 1);
+ vr->desc[i].next = VQ_RING_DESC_CHAIN_END;
+
+ /*
+ * Disable device(host) interrupting guest
+ */
+ virtqueue_disable_intr(vq);
+
+ rte_snprintf(vq_name, sizeof(vq_name), "port_%d_rx_vq",
+ dev->data->port_id);
+ PMD_INIT_LOG(DEBUG, "vq name: %s\n", vq->vq_name);
+
+ /* Only rx virtqueue needs mbufs to be allocated at initialization */
+ if (queue_type == VTNET_RQ) {
+ if (vq->mpool == NULL)
+ rte_exit(EXIT_FAILURE, "Cannot allocate initial mbufs for rx virtqueue\n");
+ /* Allocate blank mbufs for the each rx descriptor */
+ nbufs = 0;
+ error = ENOSPC;
+ while (!virtqueue_full(vq)) {
+ m = rte_rxmbuf_alloc(vq->mpool);
+ if (m == NULL)
+ break;
+ /******************************************
+ * Enqueue allocated buffers *
+ *******************************************/
+ error = virtqueue_enqueue_recv_refill(vq, m);
+ if (error) {
+ rte_pktmbuf_free_seg(m);
+ break;
+ }
+ nbufs++;
+ }
+ PMD_INIT_LOG(DEBUG, "Allocated %d bufs\n", nbufs);
+ VIRTIO_WRITE_REG_2(vq->hw, VIRTIO_PCI_QUEUE_SEL, VTNET_SQ_RQ_QUEUE_IDX);
+ VIRTIO_WRITE_REG_4(vq->hw, VIRTIO_PCI_QUEUE_PFN,
+ vq->mz->phys_addr >> VIRTIO_PCI_QUEUE_ADDR_SHIFT);
+ } else {
+ VIRTIO_WRITE_REG_2(vq->hw, VIRTIO_PCI_QUEUE_SEL, VTNET_SQ_TQ_QUEUE_IDX);
+ VIRTIO_WRITE_REG_4(vq->hw, VIRTIO_PCI_QUEUE_PFN,
+ vq->mz->phys_addr >> VIRTIO_PCI_QUEUE_ADDR_SHIFT);
+ }
+}
+
+void
+virtio_dev_rxtx_start(struct rte_eth_dev *dev)
+{
+ /*
+ * Start recieve and transmit vrings
+ * - Setup vring structure for all queues
+ * - Initialize descriptor for the rx vring
+ * - Allocate blank mbufs for the each rx descriptor
+ *
+ */
+ PMD_INIT_FUNC_TRACE();
+
+ /* Start rx vring: by default we have 1 rx virtqueue. */
+ virtio_dev_vring_start(dev, dev->data->rx_queues[0], VTNET_RQ);
+ VIRTQUEUE_DUMP((struct virtqueue *)dev->data->rx_queues[0]);
+
+ /* Start tx vring: by default we have 1 tx virtqueue. */
+ virtio_dev_vring_start(dev, dev->data->tx_queues[0], VTNET_TQ);
+ VIRTQUEUE_DUMP((struct virtqueue *)dev->data->tx_queues[0]);
+}
+
+int
+virtio_dev_rx_queue_setup(struct rte_eth_dev *dev,
+ uint16_t queue_idx,
+ uint16_t nb_desc,
+ unsigned int socket_id,
+ __rte_unused const struct rte_eth_rxconf *rx_conf,
+ struct rte_mempool *mp)
+{
+ uint8_t vtpci_queue_idx = VTNET_SQ_RQ_QUEUE_IDX;
+ struct virtqueue *vq;
+ int ret;
+
+ PMD_INIT_FUNC_TRACE();
+ ret = virtio_dev_queue_setup(dev, VTNET_RQ, queue_idx, vtpci_queue_idx,
+ nb_desc, socket_id, &vq);
+ if (ret < 0) {
+ PMD_INIT_LOG(ERR, "tvq initialization failed\n");
+ return ret;
+ }
+ /* Create mempool for rx mbuf allocation */
+ vq->mpool = mp;
+
+ dev->data->rx_queues[queue_idx] = vq;
+ return (0);
+}
+
+/*
+ * struct rte_eth_dev *dev: Used to update dev
+ * uint16_t nb_desc: Defaults to values read from config space
+ * unsigned int socket_id: Used to allocate memzone
+ * const struct rte_eth_txconf *tx_conf: Used to setup tx engine
+ * uint16_t queue_idx: Just used as an index in dev txq list
+ */
+int
+virtio_dev_tx_queue_setup(struct rte_eth_dev *dev,
+ uint16_t queue_idx,
+ uint16_t nb_desc,
+ unsigned int socket_id,
+ __rte_unused const struct rte_eth_txconf *tx_conf)
+{
+ uint8_t vtpci_queue_idx = VTNET_SQ_TQ_QUEUE_IDX;
+ struct virtqueue *vq;
+ int ret;
+
+ PMD_INIT_FUNC_TRACE();
+ ret = virtio_dev_queue_setup(dev, VTNET_TQ, queue_idx, vtpci_queue_idx,
+ nb_desc, socket_id, &vq);
+ if (ret < 0) {
+ PMD_INIT_LOG(ERR, "rvq initialization failed\n");
+ return ret;
+ }
+
+ dev->data->tx_queues[queue_idx] = vq;
+ return (0);
+}
+
+static void
+virtio_discard_rxbuf(struct virtqueue *vq, struct rte_mbuf *m)
+{
+ int error;
+ /*
+ * Requeue the discarded mbuf. This should always be
+ * successful since it was just dequeued.
+ */
+ error = virtqueue_enqueue_recv_refill(vq, m);
+ if (unlikely(error)) {
+ RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf");
+ rte_pktmbuf_free_seg(m);
+ }
+}
+
+#define VIRTIO_MBUF_BURST_SZ 64
+uint16_t
+virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
+{
+ struct virtqueue *rxvq = rx_queue;
+ struct virtio_hw *hw = rxvq->hw;
+ struct rte_mbuf *rxm, *new_mbuf;
+ uint16_t nb_used, num, nb_rx = 0;
+ uint32_t len[VIRTIO_MBUF_BURST_SZ];
+ struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
+ int error;
+ uint32_t i, nb_enqueued = 0;
+
+ nb_used = VIRTQUEUE_NUSED(rxvq);
+
+ rmb();
+
+ num = (uint16_t)(likely(nb_used <= nb_pkts) ? nb_used : nb_pkts);
+ num = (uint16_t)(likely(num <= VIRTIO_MBUF_BURST_SZ) ? num : VIRTIO_MBUF_BURST_SZ);
+ if(num == 0) return 0;
+ num = virtqueue_dequeue_burst(rxvq, rcv_pkts, len, num);
+ PMD_RX_LOG(DEBUG, "used:%d dequeue:%d\n", nb_used, num);
+ for (i = 0; i < num ; i ++) {
+ rxm = rcv_pkts[i];
+ PMD_RX_LOG(DEBUG, "packet len:%d\n", len[i]);
+ if (unlikely(len[i] < (uint32_t)hw->vtnet_hdr_size + ETHER_HDR_LEN)) {
+ PMD_RX_LOG(ERR, "Packet drop\n");
+ nb_enqueued++;
+ virtio_discard_rxbuf(rxvq, rxm);
+ hw->eth_stats.ierrors++;
+ continue;
+ }
+ rxm->pkt.in_port = rxvq->port_id;
+ rxm->pkt.data = (char *)rxm->buf_addr + RTE_PKTMBUF_HEADROOM;
+ rxm->pkt.nb_segs = 1;
+ rxm->pkt.next = NULL;
+ rxm->pkt.pkt_len = (uint32_t)(len[i] - sizeof(struct virtio_net_hdr));
+ rxm->pkt.data_len = (uint16_t)(len[i] - sizeof(struct virtio_net_hdr));
+ VIRTIO_DUMP_PACKET(rxm, rxm->pkt.data_len);
+ rx_pkts[nb_rx++] = rxm;
+ hw->eth_stats.ibytes += len[i] - sizeof(struct virtio_net_hdr);
+ }
+ hw->eth_stats.ipackets += nb_rx;
+
+ /* Allocate new mbuf for the used descriptor */
+ error = ENOSPC;
+ while (likely(!virtqueue_full(rxvq))) {
+ new_mbuf = rte_rxmbuf_alloc(rxvq->mpool);
+ if (unlikely(new_mbuf == NULL)) {
+ hw->eth_stats.rx_nombuf++;
+ break;
+ }
+ error = virtqueue_enqueue_recv_refill(rxvq, new_mbuf);
+ if (unlikely(error)) {
+ rte_pktmbuf_free_seg(new_mbuf);
+ break;
+ }
+ nb_enqueued ++;
+ }
+ if(likely(nb_enqueued)) {
+ if(unlikely(virtqueue_kick_prepare(rxvq))) {
+ virtqueue_notify(rxvq);
+ PMD_RX_LOG(DEBUG, "Notified\n");
+ }
+ }
+ return (nb_rx);
+}
+
+uint16_t
+virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
+{
+ struct virtqueue *txvq = tx_queue;
+ struct rte_mbuf *txm;
+ uint16_t nb_used, nb_tx, count, num, i;
+ int error;
+ uint32_t len[VIRTIO_MBUF_BURST_SZ];
+ struct rte_mbuf *snd_pkts[VIRTIO_MBUF_BURST_SZ];
+ struct virtio_hw *hw;
+
+ nb_tx = count = 0;
+
+ if (unlikely(nb_pkts < 1))
+ return (nb_pkts);
+
+ PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
+ nb_used = VIRTQUEUE_NUSED(txvq);
+
+ rmb();
+
+ hw = txvq->hw;
+ num = (uint16_t)(likely(nb_used < VIRTIO_MBUF_BURST_SZ) ? nb_used : VIRTIO_MBUF_BURST_SZ);
+ num = virtqueue_dequeue_burst(txvq, snd_pkts, len, num);
+ for (i = 0; i < num ; i ++) {
+ rte_pktmbuf_free_seg(snd_pkts[i]);
+ }
+
+ while (count++ < nb_pkts) {
+ if(!virtqueue_full(txvq)) {
+ txm = tx_pkts[nb_tx];
+ /************************************************/
+ /***** Enqueue Packet buffers *****/
+ /************************************************/
+ error = virtqueue_enqueue_xmit(txvq, txm);
+ if (unlikely(error)) {
+ // rte_pktmbuf_free_seg(txm); /* the upper application will free this packet */
+ if (error == ENOSPC)
+ PMD_TX_LOG(ERR, "virtqueue_enqueue Free count = 0\n");
+ else if (error == EMSGSIZE)
+ PMD_TX_LOG(ERR, "virtqueue_enqueue Free count < 1\n");
+ else
+ PMD_TX_LOG(ERR, "virtqueue_enqueue error: %d\n", error);
+ break;
+ }
+ nb_tx++;
+ hw->eth_stats.obytes += txm->pkt.data_len;
+ } else {
+ PMD_TX_LOG(ERR, "No free tx descriptors to transmit\n");
+ virtqueue_notify(txvq);
+ break;
+ }
+ }
+ hw->eth_stats.opackets += nb_tx;
+
+ if(unlikely(virtqueue_kick_prepare(txvq))) {
+ virtqueue_notify(txvq);
+ PMD_TX_LOG(DEBUG, "Notified backend after xmit\n");
+ }
+ return (nb_tx);
+}
diff --git a/lib/librte_pmd_virtio/virtqueue.c b/lib/librte_pmd_virtio/virtqueue.c
new file mode 100644
index 0000000..c9fa164
--- /dev/null
+++ b/lib/librte_pmd_virtio/virtqueue.c
@@ -0,0 +1,70 @@
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2010-2013 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_mbuf.h>
+
+#include "virtqueue.h"
+#include "virtio_logs.h"
+#include "virtio_pci.h"
+
+void
+virtqueue_disable_intr(struct virtqueue *vq)
+{
+ /*
+ * Set VRING_AVAIL_F_NO_INTERRUPT to hint host
+ * not to interrupt when it consumes packets
+ * Note: this is only considered a hint to the host
+ */
+ vq->vq_ring.avail->flags |= VRING_AVAIL_F_NO_INTERRUPT;
+}
+
+/*
+ * Two types of mbuf to be cleaned:
+ * 1) mbuf that has been consumed by backend but not used by virtio.
+ * 2) mbuf that hasn't been consued by backend.
+ */
+struct rte_mbuf *
+virtqueue_detatch_unused(struct virtqueue *vq)
+{
+ struct rte_mbuf *cookie;
+ int idx;
+
+ for(idx = 0; idx < vq->vq_nentries; idx++) {
+ if ((cookie = vq->vq_descx[idx].cookie) != NULL) {
+ vq->vq_descx[idx].cookie = NULL;
+ return cookie;
+ }
+ }
+ return (NULL);
+}
diff --git a/lib/librte_pmd_virtio/virtqueue.h b/lib/librte_pmd_virtio/virtqueue.h
new file mode 100644
index 0000000..9e50a86
--- /dev/null
+++ b/lib/librte_pmd_virtio/virtqueue.h
@@ -0,0 +1,362 @@
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2010-2013 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.
+ */
+
+#ifndef _VIRTQUEUE_H_
+#define _VIRTQUEUE_H_
+
+#include <stdint.h>
+
+#include <rte_atomic.h>
+#include <rte_mbuf.h>
+#include <rte_memory.h>
+#include <rte_memzone.h>
+#include <rte_mempool.h>
+
+#include "virtio_pci.h"
+#include "virtio_ring.h"
+#include "virtio_logs.h"
+
+#define mb() rte_mb()
+#define wmb() rte_wmb()
+#define rmb() rte_rmb()
+
+#define VIRTQUEUE_MAX_NAME_SZ 32
+
+#define RTE_MBUF_DATA_DMA_ADDR(mb) \
+ (uint64_t) ((mb)->buf_physaddr + (uint64_t)((char *)((mb)->pkt.data) - \
+ (char *)(mb)->buf_addr))
+
+#define VTNET_SQ_RQ_QUEUE_IDX 0
+#define VTNET_SQ_TQ_QUEUE_IDX 1
+#define VTNET_SQ_CQ_QUEUE_IDX 2
+
+enum { VTNET_RQ = 0, VTNET_TQ = 1, VTNET_CQ = 2 };
+/**
+ * The maximum virtqueue size is 2^15. Use that value as the end of
+ * descriptor chain terminator since it will never be a valid index
+ * in the descriptor table. This is used to verify we are correctly
+ * handling vq_free_cnt.
+ */
+#define VQ_RING_DESC_CHAIN_END 32768
+
+/**
+ * Control the RX mode, ie. promiscuous, allmulti, etc...
+ * All commands require an "out" sg entry containing a 1 byte
+ * state value, zero = disable, non-zero = enable. Commands
+ * 0 and 1 are supported with the VIRTIO_NET_F_CTRL_RX feature.
+ * Commands 2-5 are added with VIRTIO_NET_F_CTRL_RX_EXTRA.
+ */
+#define VIRTIO_NET_CTRL_RX 0
+#define VIRTIO_NET_CTRL_RX_PROMISC 0
+#define VIRTIO_NET_CTRL_RX_ALLMULTI 1
+#define VIRTIO_NET_CTRL_RX_ALLUNI 2
+#define VIRTIO_NET_CTRL_RX_NOMULTI 3
+#define VIRTIO_NET_CTRL_RX_NOUNI 4
+#define VIRTIO_NET_CTRL_RX_NOBCAST 5
+
+/**
+ * Control VLAN filtering
+ *
+ * The VLAN filter table is controlled via a simple ADD/DEL interface.
+ * VLAN IDs not added may be filtered by the hypervisor. Del is the
+ * opposite of add. Both commands expect an out entry containing a 2
+ * byte VLAN ID. VLAN filtering is available with the
+ * VIRTIO_NET_F_CTRL_VLAN feature bit.
+ */
+#define VIRTIO_NET_CTRL_VLAN 2
+#define VIRTIO_NET_CTRL_VLAN_ADD 0
+#define VIRTIO_NET_CTRL_VLAN_DEL 1
+
+struct virtqueue {
+ char vq_name[VIRTQUEUE_MAX_NAME_SZ];
+ struct virtio_hw *hw; /**< virtio_hw structure pointer. */
+ const struct rte_memzone *mz; /**< mem zone to populate RX ring. */
+ const struct rte_memzone *virtio_net_hdr_mz; /**< memzone to populate hdr. */
+ struct rte_mempool *mpool; /**< mempool for mbuf allocation */
+ uint16_t queue_id; /**< DPDK queue index. */
+ uint8_t port_id; /**< Device port identifier. */
+
+ void *vq_ring_virt_mem; /**< linear address of vring*/
+ int vq_alignment;
+ int vq_ring_size;
+ phys_addr_t vq_ring_mem; /**< physical address of vring */
+
+ struct vring vq_ring; /**< vring keeping desc, used and avail */
+ uint16_t vq_free_cnt; /**< num of desc available */
+ uint16_t vq_nentries; /**< vring desc numbers */
+ uint16_t vq_queue_index; /**< PCI queue index */
+ /**
+ * Head of the free chain in the descriptor table. If
+ * there are no free descriptors, this will be set to
+ * VQ_RING_DESC_CHAIN_END.
+ */
+ uint16_t vq_desc_head_idx;
+ /**
+ * Last consumed descriptor in the used table,
+ * trails vq_ring.used->idx.
+ */
+ uint16_t vq_used_cons_idx;
+ void *virtio_net_hdr_mem; /**< hdr for each xmit packet */
+
+ struct vq_desc_extra {
+ void *cookie;
+ uint16_t ndescs;
+ } vq_descx[0];
+};
+
+/**
+ * This is the first element of the scatter-gather list. If you don't
+ * specify GSO or CSUM features, you can simply ignore the header.
+ */
+struct virtio_net_hdr {
+#define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 /**< Use csum_start,csum_offset*/
+ uint8_t flags;
+#define VIRTIO_NET_HDR_GSO_NONE 0 /**< Not a GSO frame */
+#define VIRTIO_NET_HDR_GSO_TCPV4 1 /**< GSO frame, IPv4 TCP (TSO) */
+#define VIRTIO_NET_HDR_GSO_UDP 3 /**< GSO frame, IPv4 UDP (UFO) */
+#define VIRTIO_NET_HDR_GSO_TCPV6 4 /**< GSO frame, IPv6 TCP */
+#define VIRTIO_NET_HDR_GSO_ECN 0x80 /**< TCP has ECN set */
+ uint8_t gso_type;
+ uint16_t hdr_len; /**< Ethernet + IP + tcp/udp hdrs */
+ uint16_t gso_size; /**< Bytes to append to hdr_len per frame */
+ uint16_t csum_start; /**< Position to start checksumming from */
+ uint16_t csum_offset; /**< Offset after that to place checksum */
+};
+
+/**
+ * This is the version of the header to use when the MRG_RXBUF
+ * feature has been negotiated.
+ */
+struct virtio_net_hdr_mrg_rxbuf {
+ struct virtio_net_hdr hdr;
+ uint16_t num_buffers; /**< Number of merged rx buffers */
+};
+
+/**
+ * Tell the backend not to interrupt us.
+ */
+void virtqueue_disable_intr(struct virtqueue *vq);
+/**
+ * Dump virtqueue internal structures, for debug purpose only.
+ */
+void virtqueue_dump(struct virtqueue *vq);
+/**
+ * Get all mbufs to be freed.
+ */
+struct rte_mbuf * virtqueue_detatch_unused(struct virtqueue *vq);
+
+static inline int
+virtqueue_full(const struct virtqueue *vq)
+{
+ return (vq->vq_free_cnt == 0);
+}
+
+#define VIRTQUEUE_NUSED(vq) ((uint16_t)((vq)->vq_ring.used->idx - (vq)->vq_used_cons_idx))
+
+static inline void
+vq_ring_update_avail(struct virtqueue *vq, uint16_t desc_idx)
+{
+ uint16_t avail_idx;
+ /*
+ * Place the head of the descriptor chain into the next slot and make
+ * it usable to the host. The chain is made available now rather than
+ * deferring to virtqueue_notify() in the hopes that if the host is
+ * currently running on another CPU, we can keep it processing the new
+ * descriptor.
+ */
+ avail_idx = (uint16_t)(vq->vq_ring.avail->idx & (vq->vq_nentries - 1));
+ vq->vq_ring.avail->ring[avail_idx] = desc_idx;
+ mb();
+ vq->vq_ring.avail->idx++;
+}
+
+static inline int virtqueue_kick_prepare(struct virtqueue * vq)
+{
+ return !(vq->vq_ring.used->flags & VRING_USED_F_NO_NOTIFY);
+}
+
+static inline void
+virtqueue_notify(struct virtqueue *vq)
+{
+ /*
+ * Ensure updated avail->idx is visible to host. mb() necessary?
+ * For virtio on IA, the notificaiton is through io port operation
+ * which is a serialization instruction itself.
+ */
+ VIRTIO_WRITE_REG_2(vq->hw, VIRTIO_PCI_QUEUE_NOTIFY, vq->vq_queue_index);
+}
+
+static inline void
+vq_ring_free_chain(struct virtqueue *vq, uint16_t desc_idx)
+{
+ struct vring_desc *dp;
+ struct vq_desc_extra *dxp;
+
+ dp = &vq->vq_ring.desc[desc_idx];
+ dxp = &vq->vq_descx[desc_idx];
+ vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt + dxp->ndescs);
+ if ((dp->flags & VRING_DESC_F_INDIRECT) == 0) {
+ while (dp->flags & VRING_DESC_F_NEXT) {
+ dp = &vq->vq_ring.desc[dp->next];
+ }
+ }
+ dxp->ndescs = 0;
+
+ /*
+ * We must append the existing free chain, if any, to the end of
+ * newly freed chain. If the virtqueue was completely used, then
+ * head would be VQ_RING_DESC_CHAIN_END (ASSERTed above).
+ */
+ dp->next = vq->vq_desc_head_idx;
+ vq->vq_desc_head_idx = desc_idx;
+}
+
+static inline int
+virtqueue_enqueue_recv_refill(struct virtqueue *vq, struct rte_mbuf *cookie)
+{
+ struct vq_desc_extra *dxp;
+ struct vring_desc *start_dp;
+ uint16_t needed;
+ uint16_t head_idx, idx;
+ needed = 1;
+
+ if (unlikely(vq->vq_free_cnt == 0))
+ return (-ENOSPC);
+ if (unlikely(vq->vq_free_cnt < needed))
+ return (-EMSGSIZE);
+
+ head_idx = vq->vq_desc_head_idx;
+ if (unlikely(head_idx >= vq->vq_nentries))
+ return (-EFAULT);
+
+ idx = head_idx;
+ dxp = &vq->vq_descx[idx];
+ dxp->cookie = (void *)cookie;
+ dxp->ndescs = needed;
+
+ start_dp = vq->vq_ring.desc;
+ start_dp[idx].addr =
+ (uint64_t) (cookie->buf_physaddr + RTE_PKTMBUF_HEADROOM - sizeof(struct virtio_net_hdr));
+ start_dp[idx].len = cookie->buf_len - RTE_PKTMBUF_HEADROOM + sizeof(struct virtio_net_hdr);
+ start_dp[idx].flags = VRING_DESC_F_WRITE;
+ idx = start_dp[idx].next;
+ vq->vq_desc_head_idx = idx;
+ vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
+ vq_ring_update_avail(vq, head_idx);
+
+ return (0);
+}
+
+static inline int
+virtqueue_enqueue_xmit(struct virtqueue *txvq, struct rte_mbuf *cookie)
+{
+ struct vq_desc_extra *dxp;
+ struct vring_desc *start_dp;
+ uint16_t needed;
+ uint16_t head_idx, idx;
+ needed = 2;
+ if (unlikely(txvq->vq_free_cnt == 0))
+ return (-ENOSPC);
+ if (unlikely(txvq->vq_free_cnt < needed))
+ return (-EMSGSIZE);
+ head_idx = txvq->vq_desc_head_idx;
+ if (unlikely(head_idx >= txvq->vq_nentries))
+ return (-EFAULT);
+
+ idx = head_idx;
+ dxp = &txvq->vq_descx[idx];
+ dxp->cookie = (void *)cookie;
+ dxp->ndescs = needed;
+
+ start_dp = txvq->vq_ring.desc;
+ start_dp[idx].addr = (uint64_t)(uintptr_t)txvq->virtio_net_hdr_mem + idx * sizeof(struct virtio_net_hdr);
+ start_dp[idx].len = sizeof(struct virtio_net_hdr);
+ start_dp[idx].flags = VRING_DESC_F_NEXT;
+ idx = start_dp[idx].next;
+ start_dp[idx].addr = RTE_MBUF_DATA_DMA_ADDR(cookie);
+ start_dp[idx].len = cookie->pkt.data_len;
+ start_dp[idx].flags = 0;
+ idx = start_dp[idx].next;
+ txvq->vq_desc_head_idx = idx;
+ txvq->vq_free_cnt = (uint16_t)(txvq->vq_free_cnt - needed);
+ vq_ring_update_avail(txvq, head_idx);
+
+ return (0);
+}
+
+static inline uint16_t
+virtqueue_dequeue_burst(struct virtqueue *vq, struct rte_mbuf **rx_pkts, uint32_t *len, uint16_t num)
+{
+ struct vring_used_elem *uep;
+ struct rte_mbuf *cookie;
+ uint16_t used_idx, desc_idx;
+ uint16_t i;
+ /* Caller does the check */
+ for (i = 0; i < num ; i ++) {
+ used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
+ uep = &vq->vq_ring.used->ring[used_idx];
+ desc_idx = (uint16_t) uep->id;
+ cookie = (struct rte_mbuf *)vq->vq_descx[desc_idx].cookie;
+ if (unlikely(cookie == NULL)) {
+ PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u\n",
+ vq->vq_used_cons_idx);
+ break;
+ }
+ len[i] = uep->len;
+ rx_pkts[i] = cookie;
+ vq->vq_used_cons_idx++;
+ vq_ring_free_chain(vq, desc_idx);
+ vq->vq_descx[desc_idx].cookie = NULL;
+ }
+ return (i);
+}
+
+#ifdef RTE_LIBRTE_VIRTIO_DEBUG_DUMP
+#define VIRTQUEUE_DUMP(vq) do { \
+ uint16_t used_idx, nused; \
+ used_idx = (vq)->vq_ring.used->idx; \
+ nused = (uint16_t)(used_idx - (vq)->vq_used_cons_idx); \
+ PMD_INIT_LOG(DEBUG, \
+ "VQ: %s - size=%d; free=%d; used=%d; desc_head_idx=%d;" \
+ " avail.idx=%d; used_cons_idx=%d; used.idx=%d;" \
+ " avail.flags=0x%x; used.flags=0x%x\n", \
+ (vq)->vq_name, (vq)->vq_nentries, (vq)->vq_free_cnt, nused, \
+ (vq)->vq_desc_head_idx, (vq)->vq_ring.avail->idx, \
+ (vq)->vq_used_cons_idx, (vq)->vq_ring.used->idx, \
+ (vq)->vq_ring.avail->flags, (vq)->vq_ring.used->flags); \
+} while (0)
+#else
+#define VIRTQUEUE_DUMP(vq) do { } while (0)
+#endif
+
+#endif /* _VIRTQUEUE_H_ */