--- /dev/null
+/*-
+ * 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 <linux/vhost.h>
+#include <linux/virtio_net.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdlib.h>
+#ifdef RTE_LIBRTE_VHOST_NUMA
+#include <numaif.h>
+#endif
+
+#include <rte_ethdev.h>
+#include <rte_log.h>
+#include <rte_string_fns.h>
+#include <rte_memory.h>
+#include <rte_malloc.h>
+#include <rte_virtio_net.h>
+
+#include "vhost.h"
+
+#define VHOST_USER_F_PROTOCOL_FEATURES 30
+
+/* Features supported by this lib. */
+#define VHOST_SUPPORTED_FEATURES ((1ULL << VIRTIO_NET_F_MRG_RXBUF) | \
+ (1ULL << VIRTIO_NET_F_CTRL_VQ) | \
+ (1ULL << VIRTIO_NET_F_CTRL_RX) | \
+ (1ULL << VIRTIO_NET_F_GUEST_ANNOUNCE) | \
+ (VHOST_SUPPORTS_MQ) | \
+ (1ULL << VIRTIO_F_VERSION_1) | \
+ (1ULL << VHOST_F_LOG_ALL) | \
+ (1ULL << VHOST_USER_F_PROTOCOL_FEATURES) | \
+ (1ULL << VIRTIO_NET_F_HOST_TSO4) | \
+ (1ULL << VIRTIO_NET_F_HOST_TSO6) | \
+ (1ULL << VIRTIO_NET_F_CSUM) | \
+ (1ULL << VIRTIO_NET_F_GUEST_CSUM) | \
+ (1ULL << VIRTIO_NET_F_GUEST_TSO4) | \
+ (1ULL << VIRTIO_NET_F_GUEST_TSO6) | \
+ (1ULL << VIRTIO_RING_F_INDIRECT_DESC))
+
+uint64_t VHOST_FEATURES = VHOST_SUPPORTED_FEATURES;
+
+struct virtio_net *vhost_devices[MAX_VHOST_DEVICE];
+
+/* device ops to add/remove device to/from data core. */
+struct virtio_net_device_ops const *notify_ops;
+
+struct virtio_net *
+get_device(int vid)
+{
+ struct virtio_net *dev = vhost_devices[vid];
+
+ if (unlikely(!dev)) {
+ RTE_LOG(ERR, VHOST_CONFIG,
+ "(%d) device not found.\n", vid);
+ }
+
+ return dev;
+}
+
+static void
+cleanup_vq(struct vhost_virtqueue *vq, int destroy)
+{
+ if ((vq->callfd >= 0) && (destroy != 0))
+ close(vq->callfd);
+ if (vq->kickfd >= 0)
+ close(vq->kickfd);
+}
+
+/*
+ * Unmap any memory, close any file descriptors and
+ * free any memory owned by a device.
+ */
+void
+cleanup_device(struct virtio_net *dev, int destroy)
+{
+ uint32_t i;
+
+ vhost_backend_cleanup(dev);
+
+ for (i = 0; i < dev->virt_qp_nb; i++) {
+ cleanup_vq(dev->virtqueue[i * VIRTIO_QNUM + VIRTIO_RXQ], destroy);
+ cleanup_vq(dev->virtqueue[i * VIRTIO_QNUM + VIRTIO_TXQ], destroy);
+ }
+}
+
+/*
+ * Release virtqueues and device memory.
+ */
+static void
+free_device(struct virtio_net *dev)
+{
+ uint32_t i;
+ struct vhost_virtqueue *rxq, *txq;
+
+ for (i = 0; i < dev->virt_qp_nb; i++) {
+ rxq = dev->virtqueue[i * VIRTIO_QNUM + VIRTIO_RXQ];
+ txq = dev->virtqueue[i * VIRTIO_QNUM + VIRTIO_TXQ];
+
+ rte_free(rxq->shadow_used_ring);
+ rte_free(txq->shadow_used_ring);
+
+ /* rxq and txq are allocated together as queue-pair */
+ rte_free(rxq);
+ }
+
+ rte_free(dev);
+}
+
+static void
+init_vring_queue(struct vhost_virtqueue *vq, int qp_idx)
+{
+ memset(vq, 0, sizeof(struct vhost_virtqueue));
+
+ vq->kickfd = VIRTIO_UNINITIALIZED_EVENTFD;
+ vq->callfd = VIRTIO_UNINITIALIZED_EVENTFD;
+
+ /* Backends are set to -1 indicating an inactive device. */
+ vq->backend = -1;
+
+ /* always set the default vq pair to enabled */
+ if (qp_idx == 0)
+ vq->enabled = 1;
+
+ TAILQ_INIT(&vq->zmbuf_list);
+}
+
+static void
+init_vring_queue_pair(struct virtio_net *dev, uint32_t qp_idx)
+{
+ uint32_t base_idx = qp_idx * VIRTIO_QNUM;
+
+ init_vring_queue(dev->virtqueue[base_idx + VIRTIO_RXQ], qp_idx);
+ init_vring_queue(dev->virtqueue[base_idx + VIRTIO_TXQ], qp_idx);
+}
+
+static void
+reset_vring_queue(struct vhost_virtqueue *vq, int qp_idx)
+{
+ int callfd;
+
+ callfd = vq->callfd;
+ init_vring_queue(vq, qp_idx);
+ vq->callfd = callfd;
+}
+
+static void
+reset_vring_queue_pair(struct virtio_net *dev, uint32_t qp_idx)
+{
+ uint32_t base_idx = qp_idx * VIRTIO_QNUM;
+
+ reset_vring_queue(dev->virtqueue[base_idx + VIRTIO_RXQ], qp_idx);
+ reset_vring_queue(dev->virtqueue[base_idx + VIRTIO_TXQ], qp_idx);
+}
+
+int
+alloc_vring_queue_pair(struct virtio_net *dev, uint32_t qp_idx)
+{
+ struct vhost_virtqueue *virtqueue = NULL;
+ uint32_t virt_rx_q_idx = qp_idx * VIRTIO_QNUM + VIRTIO_RXQ;
+ uint32_t virt_tx_q_idx = qp_idx * VIRTIO_QNUM + VIRTIO_TXQ;
+
+ virtqueue = rte_malloc(NULL,
+ sizeof(struct vhost_virtqueue) * VIRTIO_QNUM, 0);
+ if (virtqueue == NULL) {
+ RTE_LOG(ERR, VHOST_CONFIG,
+ "Failed to allocate memory for virt qp:%d.\n", qp_idx);
+ return -1;
+ }
+
+ dev->virtqueue[virt_rx_q_idx] = virtqueue;
+ dev->virtqueue[virt_tx_q_idx] = virtqueue + VIRTIO_TXQ;
+
+ init_vring_queue_pair(dev, qp_idx);
+
+ dev->virt_qp_nb += 1;
+
+ return 0;
+}
+
+/*
+ * Reset some variables in device structure, while keeping few
+ * others untouched, such as vid, ifname, virt_qp_nb: they
+ * should be same unless the device is removed.
+ */
+void
+reset_device(struct virtio_net *dev)
+{
+ uint32_t i;
+
+ dev->features = 0;
+ dev->protocol_features = 0;
+ dev->flags = 0;
+
+ for (i = 0; i < dev->virt_qp_nb; i++)
+ reset_vring_queue_pair(dev, i);
+}
+
+/*
+ * Invoked when there is a new vhost-user connection established (when
+ * there is a new virtio device being attached).
+ */
+int
+vhost_new_device(void)
+{
+ struct virtio_net *dev;
+ int i;
+
+ dev = rte_zmalloc(NULL, sizeof(struct virtio_net), 0);
+ if (dev == NULL) {
+ RTE_LOG(ERR, VHOST_CONFIG,
+ "Failed to allocate memory for new dev.\n");
+ return -1;
+ }
+
+ for (i = 0; i < MAX_VHOST_DEVICE; i++) {
+ if (vhost_devices[i] == NULL)
+ break;
+ }
+ if (i == MAX_VHOST_DEVICE) {
+ RTE_LOG(ERR, VHOST_CONFIG,
+ "Failed to find a free slot for new device.\n");
+ return -1;
+ }
+
+ vhost_devices[i] = dev;
+ dev->vid = i;
+
+ return i;
+}
+
+/*
+ * Invoked when there is the vhost-user connection is broken (when
+ * the virtio device is being detached).
+ */
+void
+vhost_destroy_device(int vid)
+{
+ struct virtio_net *dev = get_device(vid);
+
+ if (dev == NULL)
+ return;
+
+ if (dev->flags & VIRTIO_DEV_RUNNING) {
+ dev->flags &= ~VIRTIO_DEV_RUNNING;
+ notify_ops->destroy_device(vid);
+ }
+
+ cleanup_device(dev, 1);
+ free_device(dev);
+
+ vhost_devices[vid] = NULL;
+}
+
+void
+vhost_set_ifname(int vid, const char *if_name, unsigned int if_len)
+{
+ struct virtio_net *dev;
+ unsigned int len;
+
+ dev = get_device(vid);
+ if (dev == NULL)
+ return;
+
+ len = if_len > sizeof(dev->ifname) ?
+ sizeof(dev->ifname) : if_len;
+
+ strncpy(dev->ifname, if_name, len);
+ dev->ifname[sizeof(dev->ifname) - 1] = '\0';
+}
+
+void
+vhost_enable_dequeue_zero_copy(int vid)
+{
+ struct virtio_net *dev = get_device(vid);
+
+ if (dev == NULL)
+ return;
+
+ dev->dequeue_zero_copy = 1;
+}
+
+int
+rte_vhost_get_numa_node(int vid)
+{
+#ifdef RTE_LIBRTE_VHOST_NUMA
+ struct virtio_net *dev = get_device(vid);
+ int numa_node;
+ int ret;
+
+ if (dev == NULL)
+ return -1;
+
+ ret = get_mempolicy(&numa_node, NULL, 0, dev,
+ MPOL_F_NODE | MPOL_F_ADDR);
+ if (ret < 0) {
+ RTE_LOG(ERR, VHOST_CONFIG,
+ "(%d) failed to query numa node: %d\n", vid, ret);
+ return -1;
+ }
+
+ return numa_node;
+#else
+ RTE_SET_USED(vid);
+ return -1;
+#endif
+}
+
+uint32_t
+rte_vhost_get_queue_num(int vid)
+{
+ struct virtio_net *dev = get_device(vid);
+
+ if (dev == NULL)
+ return 0;
+
+ return dev->virt_qp_nb;
+}
+
+int
+rte_vhost_get_ifname(int vid, char *buf, size_t len)
+{
+ struct virtio_net *dev = get_device(vid);
+
+ if (dev == NULL)
+ return -1;
+
+ len = RTE_MIN(len, sizeof(dev->ifname));
+
+ strncpy(buf, dev->ifname, len);
+ buf[len - 1] = '\0';
+
+ return 0;
+}
+
+uint16_t
+rte_vhost_avail_entries(int vid, uint16_t queue_id)
+{
+ struct virtio_net *dev;
+ struct vhost_virtqueue *vq;
+
+ dev = get_device(vid);
+ if (!dev)
+ return 0;
+
+ vq = dev->virtqueue[queue_id];
+ if (!vq->enabled)
+ return 0;
+
+ return *(volatile uint16_t *)&vq->avail->idx - vq->last_used_idx;
+}
+
+int
+rte_vhost_enable_guest_notification(int vid, uint16_t queue_id, int enable)
+{
+ struct virtio_net *dev = get_device(vid);
+
+ if (dev == NULL)
+ return -1;
+
+ if (enable) {
+ RTE_LOG(ERR, VHOST_CONFIG,
+ "guest notification isn't supported.\n");
+ return -1;
+ }
+
+ dev->virtqueue[queue_id]->used->flags = VRING_USED_F_NO_NOTIFY;
+ return 0;
+}
+
+uint64_t rte_vhost_feature_get(void)
+{
+ return VHOST_FEATURES;
+}
+
+int rte_vhost_feature_disable(uint64_t feature_mask)
+{
+ VHOST_FEATURES = VHOST_FEATURES & ~feature_mask;
+ return 0;
+}
+
+int rte_vhost_feature_enable(uint64_t feature_mask)
+{
+ if ((feature_mask & VHOST_SUPPORTED_FEATURES) == feature_mask) {
+ VHOST_FEATURES = VHOST_FEATURES | feature_mask;
+ return 0;
+ }
+ return -1;
+}
+
+/*
+ * Register ops so that we can add/remove device to data core.
+ */
+int
+rte_vhost_driver_callback_register(struct virtio_net_device_ops const * const ops)
+{
+ notify_ops = ops;
+
+ return 0;
+}
Code Review / deb_dpdk.git / blobdiff