--- /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 <stdint.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "virtio_logs.h"
+#include "virtio_pci.h"
+#include "virtqueue.h"
+#include "virtio_user/virtio_user_dev.h"
+
+#define virtio_user_get_dev(hw) \
+ ((struct virtio_user_dev *)(hw)->virtio_user_dev)
+
+static void
+virtio_user_read_dev_config(struct virtio_hw *hw, size_t offset,
+ void *dst, int length)
+{
+ int i;
+ struct virtio_user_dev *dev = virtio_user_get_dev(hw);
+
+ if (offset == offsetof(struct virtio_net_config, mac) &&
+ length == ETHER_ADDR_LEN) {
+ for (i = 0; i < ETHER_ADDR_LEN; ++i)
+ ((uint8_t *)dst)[i] = dev->mac_addr[i];
+ return;
+ }
+
+ if (offset == offsetof(struct virtio_net_config, status))
+ *(uint16_t *)dst = dev->status;
+
+ if (offset == offsetof(struct virtio_net_config, max_virtqueue_pairs))
+ *(uint16_t *)dst = dev->max_queue_pairs;
+}
+
+static void
+virtio_user_write_dev_config(struct virtio_hw *hw, size_t offset,
+ const void *src, int length)
+{
+ int i;
+ struct virtio_user_dev *dev = virtio_user_get_dev(hw);
+
+ if ((offset == offsetof(struct virtio_net_config, mac)) &&
+ (length == ETHER_ADDR_LEN))
+ for (i = 0; i < ETHER_ADDR_LEN; ++i)
+ dev->mac_addr[i] = ((const uint8_t *)src)[i];
+ else
+ PMD_DRV_LOG(ERR, "not supported offset=%" PRIu64 ", len=%d\n",
+ offset, length);
+}
+
+static void
+virtio_user_set_status(struct virtio_hw *hw, uint8_t status)
+{
+ struct virtio_user_dev *dev = virtio_user_get_dev(hw);
+
+ if (status & VIRTIO_CONFIG_STATUS_DRIVER_OK)
+ virtio_user_start_device(dev);
+ dev->status = status;
+}
+
+static void
+virtio_user_reset(struct virtio_hw *hw)
+{
+ struct virtio_user_dev *dev = virtio_user_get_dev(hw);
+
+ virtio_user_stop_device(dev);
+}
+
+static uint8_t
+virtio_user_get_status(struct virtio_hw *hw)
+{
+ struct virtio_user_dev *dev = virtio_user_get_dev(hw);
+
+ return dev->status;
+}
+
+static uint64_t
+virtio_user_get_features(struct virtio_hw *hw)
+{
+ struct virtio_user_dev *dev = virtio_user_get_dev(hw);
+
+ return dev->features;
+}
+
+static void
+virtio_user_set_features(struct virtio_hw *hw, uint64_t features)
+{
+ struct virtio_user_dev *dev = virtio_user_get_dev(hw);
+
+ dev->features = features;
+}
+
+static uint8_t
+virtio_user_get_isr(struct virtio_hw *hw __rte_unused)
+{
+ /* When config interrupt happens, driver calls this function to query
+ * what kinds of change happen. Interrupt mode not supported for now.
+ */
+ return 0;
+}
+
+static uint16_t
+virtio_user_set_config_irq(struct virtio_hw *hw __rte_unused,
+ uint16_t vec __rte_unused)
+{
+ return VIRTIO_MSI_NO_VECTOR;
+}
+
+/* This function is to get the queue size, aka, number of descs, of a specified
+ * queue. Different with the VHOST_USER_GET_QUEUE_NUM, which is used to get the
+ * max supported queues.
+ */
+static uint16_t
+virtio_user_get_queue_num(struct virtio_hw *hw, uint16_t queue_id __rte_unused)
+{
+ struct virtio_user_dev *dev = virtio_user_get_dev(hw);
+
+ /* Currently, each queue has same queue size */
+ return dev->queue_size;
+}
+
+static int
+virtio_user_setup_queue(struct virtio_hw *hw, struct virtqueue *vq)
+{
+ struct virtio_user_dev *dev = virtio_user_get_dev(hw);
+ uint16_t queue_idx = vq->vq_queue_index;
+ uint64_t desc_addr, avail_addr, used_addr;
+
+ desc_addr = (uintptr_t)vq->vq_ring_virt_mem;
+ avail_addr = desc_addr + vq->vq_nentries * sizeof(struct vring_desc);
+ used_addr = RTE_ALIGN_CEIL(avail_addr + offsetof(struct vring_avail,
+ ring[vq->vq_nentries]),
+ VIRTIO_PCI_VRING_ALIGN);
+
+ dev->vrings[queue_idx].num = vq->vq_nentries;
+ dev->vrings[queue_idx].desc = (void *)(uintptr_t)desc_addr;
+ dev->vrings[queue_idx].avail = (void *)(uintptr_t)avail_addr;
+ dev->vrings[queue_idx].used = (void *)(uintptr_t)used_addr;
+
+ return 0;
+}
+
+static void
+virtio_user_del_queue(struct virtio_hw *hw, struct virtqueue *vq)
+{
+ /* For legacy devices, write 0 to VIRTIO_PCI_QUEUE_PFN port, QEMU
+ * correspondingly stops the ioeventfds, and reset the status of
+ * the device.
+ * For modern devices, set queue desc, avail, used in PCI bar to 0,
+ * not see any more behavior in QEMU.
+ *
+ * Here we just care about what information to deliver to vhost-user
+ * or vhost-kernel. So we just close ioeventfd for now.
+ */
+ struct virtio_user_dev *dev = virtio_user_get_dev(hw);
+
+ close(dev->callfds[vq->vq_queue_index]);
+ close(dev->kickfds[vq->vq_queue_index]);
+}
+
+static void
+virtio_user_notify_queue(struct virtio_hw *hw, struct virtqueue *vq)
+{
+ uint64_t buf = 1;
+ struct virtio_user_dev *dev = virtio_user_get_dev(hw);
+
+ if (write(dev->kickfds[vq->vq_queue_index], &buf, sizeof(buf)) < 0)
+ PMD_DRV_LOG(ERR, "failed to kick backend: %s\n",
+ strerror(errno));
+}
+
+static const struct virtio_pci_ops virtio_user_ops = {
+ .read_dev_cfg = virtio_user_read_dev_config,
+ .write_dev_cfg = virtio_user_write_dev_config,
+ .reset = virtio_user_reset,
+ .get_status = virtio_user_get_status,
+ .set_status = virtio_user_set_status,
+ .get_features = virtio_user_get_features,
+ .set_features = virtio_user_set_features,
+ .get_isr = virtio_user_get_isr,
+ .set_config_irq = virtio_user_set_config_irq,
+ .get_queue_num = virtio_user_get_queue_num,
+ .setup_queue = virtio_user_setup_queue,
+ .del_queue = virtio_user_del_queue,
+ .notify_queue = virtio_user_notify_queue,
+};
git.droids-corp.org / dpdk.git / commitdiff