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Re: [Minios-devel] [UNIKRAFT PATCH] plat/kvm: Introduce virtio network driver
This patch must be applied after Unikraft Network API is upstreamed.
Initial implementation of a virtio network driver based on Unikraft
Net API and virtio base driver/rings. Supports basic Net API
functions such as start/stop, RX/TX packet and RX interrupt callback.
Tested with lwIP, both as polling-mode driver and with interrupts.
The implementation was ported from Solo5 and adapted to Unikraft APIs.
Signed-off-by: Razvan Cojocaru <razvan.cojocaru93@xxxxxxxxx>
---
plat/drivers/virtio/virtio_net.c | 546 +++++++++++++++++++++++++++++++++++++++
plat/kvm/Config.uk | 10 +-
plat/kvm/Makefile.uk | 11 +-
3 files changed, 560 insertions(+), 7 deletions(-)
create mode 100644 plat/drivers/virtio/virtio_net.c
diff --git a/plat/drivers/virtio/virtio_net.c b/plat/drivers/virtio/virtio_net.c
new file mode 100644
index 0000000..d416752
--- /dev/null
+++ b/plat/drivers/virtio/virtio_net.c
@@ -0,0 +1,546 @@
+/* SPDX-License-Identifier: ISC */
+/*
+ * Authors: Dan Williams
+ * Martin Lucina
+ * Ricardo Koller
+ * Razvan Cojocaru <razvan.cojocaru93@xxxxxxxxx>
+ *
+ * Copyright (c) 2015-2017 IBM
+ * Copyright (c) 2016-2017 Docker, Inc.
+ * Copyright (c) 2018, NEC Europe Ltd., NEC Corporation
+ *
+ * Permission to use, copy, modify, and/or distribute this software
+ * for any purpose with or without fee is hereby granted, provided
+ * that the above copyright notice and this permission notice appear
+ * in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
+ * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
+ * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+ * OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
+ * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+/* Taken and adapted from solo5 virtio_net.c */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <uk/plat/lcpu.h>
+#include <pci/pci_bus.h>
+#include <kvm/irq.h>
+#include <cpu.h>
+#include <pci/virtio/virtio_ring.h>
+#include <pci/virtio/virtio_pci.h>
+#include <uk/wait.h>
+#include <uk/netdev.h>
+#include <uk/print.h>
+#include <uk/assert.h>
+#include <uk/essentials.h>
+#if CONFIG_HAVE_SCHED
+#include <uk/thread.h>
+#include <uk/wait.h>
+#endif
+
+#define VENDOR_QUMRANET_VIRTIO 0x1af4
+#define PCI_CONF_SUBSYS_NET 1
+
+/* The feature bitmap for virtio net */
+#define VIRTIO_NET_F_CSUM 0 /* Host handles pkts w/ partial csum */
+#define VIRTIO_NET_F_GUEST_CSUM 1 /* Guest handles pkts w/ partial csum */
+#define VIRTIO_NET_F_MAC (1 << 5) /* Host has given MAC address. */
+
+#define PKT_BUFFER_LEN 1526
+
+static struct uk_alloc *a;
+
+#define VIRTQ_RECV 0
+#define VIRTQ_XMIT 1
+
+/* This header comes first in the scatter-gather list.
+ * If VIRTIO_F_ANY_LAYOUT is not negotiated, it must
+ * be the first element of the scatter-gather list. If you don't
+ * specify GSO or CSUM features, you can simply ignore the header.
+ */
+struct __packed virtio_net_hdr {
+#define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 /* Use csum_start, csum_offset */
+#define VIRTIO_NET_HDR_F_DATA_VALID 2 /* Csum is valid */
+ 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 */
+};
+
+struct virtio_net_device {
+ struct pci_device *dev;
+ struct uk_netdev netdev;
+ uint16_t pci_base; /* base in PCI config space */
+ struct virtq recvq;
+ uint8_t recv_intr_enabled;
+ struct virtq xmitq;
+ struct uk_thread *thread;
+ struct uk_waitq wq;
+};
+
+static int virtio_net_irq_handle(void *arg)
+{
+ struct virtio_net_device *d = (struct virtio_net_device *) arg;
+ uint8_t isr_status;
+
+ if (unlikely(d->netdev.data->state != UK_NETDEV_RUNNING))
+ return 0;
+
+ isr_status = inb(d->pci_base + VIRTIO_PCI_ISR);
+ if (isr_status & VIRTIO_PCI_ISR_HAS_INTR) {
+ uk_waitq_wake_up(&d->wq);
+ return 1;
+ }
+ return 0;
+}
+
+static void recv_setup(struct virtio_net_device *d)
+{
+ uint16_t mask = (uint16_t)(d->recvq.num - 1);
+
+ do {
+ struct io_buffer
+ *buf; /* header and data in a single descriptor */
+ buf = &d->recvq.bufs[d->recvq.next_avail & mask];
+ memset(buf->data, 0, PKT_BUFFER_LEN);
+ buf->len = PKT_BUFFER_LEN;
+ buf->extra_flags = VIRTQ_DESC_F_WRITE;
+ UK_ASSERT(virtq_add_descriptor_chain(
+ &d->recvq, d->recvq.next_avail & mask, 1)
+ == 0);
+ } while ((d->recvq.next_avail & mask) != 0);
+
+ outw(d->pci_base + VIRTIO_PCI_QUEUE_NOTIFY, VIRTQ_RECV);
+}
+
+static int virtio_netdev_xmit(struct uk_netdev *n,
+ uint16_t queue_id __unused, struct uk_netdev_mbuf *mbuf)
+{
+ struct virtio_net_device *d;
+ struct io_buffer *head_buf, *data_buf;
+ uint16_t mask;
+ uint16_t head;
+ int r;
+
+ UK_ASSERT(n != NULL);
+ d = __containerof(n, struct virtio_net_device, netdev);
+ mask = (uint16_t)(d->xmitq.num - 1);
+
+ if (unlikely(mbuf->len > PKT_BUFFER_LEN))
+ return -EINVAL;
+
+ /* Consume used descriptors from all the previous tx'es. */
+ for (; d->xmitq.last_used != d->xmitq.used->idx; d->xmitq.last_used++)
+ d->xmitq.num_avail += 2; /* 2 descriptors per chain */
+
+ /* next_avail is incremented by virtq_add_descriptor_chain below. */
+ head = d->xmitq.next_avail & mask;
+ head_buf = &d->xmitq.bufs[head];
+ data_buf = &d->xmitq.bufs[(head + 1) & mask];
+
+ /* The header buf */
+ memset(head_buf->data, 0, sizeof(struct virtio_net_hdr));
+ head_buf->len = sizeof(struct virtio_net_hdr);
+ head_buf->extra_flags = 0;
+
+ /* The data buf */
+ memcpy(data_buf->data, mbuf->payload, mbuf->len);
+ data_buf->len = mbuf->len;
+ data_buf->extra_flags = 0;
+
+ r = virtq_add_descriptor_chain(&d->xmitq, head, 2);
+
+ outw(d->pci_base + VIRTIO_PCI_QUEUE_NOTIFY, VIRTQ_XMIT);
+
+ return r;
+}
+
+/* Get the data from the next_avail (top-most) receive buffer/descriptor in
+ * the available ring.
+ */
+static uint8_t *virtio_net_recv_ring_get(struct virtio_net_device *d,
+ uint16_t *size)
+{
+ uint16_t mask;
+ struct virtq_used_elem *e;
+ struct io_buffer *buf;
+ uint8_t *pkt;
+
+ mask = (uint16_t)(d->recvq.num - 1);
+
+ d->recvq.avail->flags |= VIRTQ_AVAIL_F_NO_INTERRUPT;
+
+ /* The device increments used->idx whenever it uses a packet (i.e. it
+ * put a packet on our receive queue) and if it's ahead of last_used it
+ * means that we have a pending packet.
+ */
+ if (d->recvq.last_used == d->recvq.used->idx)
+ return NULL;
+
+ e = &(d->recvq.used->ring[d->recvq.last_used & mask]);
+
+ if (e->len == 0) {
+ if (d->recv_intr_enabled)
+ d->recvq.avail->flags &= ~VIRTQ_AVAIL_F_NO_INTERRUPT;
+ *size = 0;
+ return NULL;
+ }
+
+ buf = (struct io_buffer *)d->recvq.desc[e->id].addr;
+ buf->len = e->len;
+
+ /* Remove the virtio_net_hdr */
+ *size = buf->len - sizeof(struct virtio_net_hdr);
+ pkt = buf->data + sizeof(struct virtio_net_hdr);
+
+ UK_ASSERT(*size <= PKT_BUFFER_LEN);
+
+ return pkt;
+}
+
+/* Return the next_avail (top-most) receive buffer/descriptor to the available
+ * ring.
+ */
+static void virtio_net_recv_ring_release(struct virtio_net_device *d)
+{
+ uint16_t mask;
+
+ /* Consume the recently used descriptor. */
+ d->recvq.last_used++;
+ d->recvq.num_avail++;
+
+ mask = (uint16_t)(d->recvq.num - 1);
+ d->recvq.bufs[d->recvq.next_avail & mask].len = PKT_BUFFER_LEN;
+ d->recvq.bufs[d->recvq.next_avail & mask].extra_flags =
+ VIRTQ_DESC_F_WRITE;
+
+ /* This sets the returned descriptor to be ready for incoming
+ * packets, and advances the next_avail index.
+ */
+ UK_ASSERT(
+ virtq_add_descriptor_chain(&d->recvq, d->recvq.next_avail & mask, 1)
+ == 0);
+ outw(d->pci_base + VIRTIO_PCI_QUEUE_NOTIFY, VIRTQ_RECV);
+
+ if (d->recv_intr_enabled)
+ d->recvq.avail->flags &= ~VIRTQ_AVAIL_F_NO_INTERRUPT;
+}
+
+static int virtio_netdev_recv(struct uk_netdev *n,
+ uint16_t queue_id __unused, struct uk_netdev_mbuf *mbuf)
+{
+ struct virtio_net_device *d;
+ uint8_t *pkt;
+ uint16_t pktlen = 0;
+
+ UK_ASSERT(n != NULL);
+ d = __containerof(n, struct virtio_net_device, netdev);
+
+ pkt = virtio_net_recv_ring_get(d, &pktlen);
+
+ if (pkt) {
+ /* also, it's clearly not zero copy */
+ memcpy(mbuf->payload, pkt, pktlen);
+ mbuf->len = pktlen;
+ virtio_net_recv_ring_release(d);
+ }
+
+ return pktlen;
+}
+
+static int virtio_netdev_rx_queue_setup(struct uk_netdev *n,
+ uint16_t queue_id __unused,
+ const struct uk_netdev_rxqueue_conf *conf __unused)
+{
+ struct virtio_net_device *d;
+ int err;
+
+ UK_ASSERT(n != NULL);
+ d = __containerof(n, struct virtio_net_device, netdev);
+
+ /*
+ * Perform device-specific setup, including discovery of virtqueues
+ * for the device, optional per-bus setup, reading and possibly writing
+ * the device's virtio configuration space, and population of
+ * virtqueues.
+ */
+ err = virtq_rings_init(&d->recvq, d->pci_base, VIRTQ_RECV, a);
+ if (err)
+ goto err_out;
+
+ d->recvq.bufs = uk_calloc(a, d->recvq.num, sizeof(struct io_buffer));
+ if (!d->recvq.bufs) {
+ err = -ENOMEM;
+ goto err_freeq;
+ }
+
+ recv_setup(d);
+
+ return 0;
+
+err_freeq:
+ virtq_rings_fini(&d->recvq, d->pci_base, VIRTQ_RECV, a);
+err_out:
+ return err;
+}
+
+static int virtio_netdev_tx_queue_setup(struct uk_netdev *n,
+ uint16_t queue_id __unused,
+ const struct uk_netdev_txqueue_conf *conf __unused)
+{
+ struct virtio_net_device *d;
+ int err;
+
+ UK_ASSERT(n != NULL);
+ d = __containerof(n, struct virtio_net_device, netdev);
+
+ err = virtq_rings_init(&d->xmitq, d->pci_base, VIRTQ_XMIT, a);
+ if (err)
+ goto err_out;
+
+ d->xmitq.bufs = uk_calloc(a, d->xmitq.num, sizeof(struct io_buffer));
+ UK_ASSERT(d->recvq.bufs != NULL);
+ if (!d->xmitq.bufs) {
+ err = -ENOMEM;
+ goto err_freeq;
+ }
+
+ return 0;
+
+err_freeq:
+ virtq_rings_fini(&d->xmitq, d->pci_base, VIRTQ_XMIT, a);
+err_out:
+ return err;
+}
+
+static int virtio_netdev_configure(struct uk_netdev *n,
+ __unused const struct uk_netdev_conf *conf)
+{
+ struct virtio_net_device *d;
+ uint32_t host_features, guest_features;
+ struct uk_hwaddr mac;
+
+ UK_ASSERT(n != NULL);
+ d = __containerof(n, struct virtio_net_device, netdev);
+
+ d->pci_base = d->dev->base;
+
+ /*
+ * Set the ACKNOWLEDGE status bit: the guest OS has notice the
+ * device.
+ * Set the DRIVER status bit: the guest OS knows how to drive the
+ * device.
+ */
+ outb(d->pci_base + VIRTIO_PCI_STATUS, VIRTIO_PCI_STATUS_ACK);
+ outb(d->pci_base + VIRTIO_PCI_STATUS, VIRTIO_PCI_STATUS_DRIVER);
+
+ /*
+ * Read device feature bits, and write the subset of feature bits
+ * understood by the OS and driver to the device. During this step the
+ * driver MAY read (but MUST NOT write) the device-specific
+ * configuration fields to check that it can support the device before
+ * accepting it.
+ */
+ host_features = inl(d->pci_base + VIRTIO_PCI_HOST_FEATURES);
+ UK_ASSERT(host_features & VIRTIO_NET_F_MAC);
+
+ /* only negotiate that the mac was set for now */
+ guest_features = VIRTIO_NET_F_MAC;
+ outl(d->pci_base + VIRTIO_PCI_GUEST_FEATURES, guest_features);
+
+ for (int i = 0; i < UK_HWADDR_LEN; i++)
+ mac.addr_bytes[i] =
+ inb(d->pci_base + VIRTIO_PCI_CONFIG_OFF + i);
+ memcpy(&n->data->mac_addr, &mac, sizeof(struct uk_hwaddr));
+
+ ukplat_irq_register(d->dev->irq, virtio_net_irq_handle, d);
+
+ /*
+ * Set the DRIVER_OK status bit. At this point the device is "live".
+ */
+ outb(d->pci_base + VIRTIO_PCI_STATUS, VIRTIO_PCI_STATUS_DRIVER_OK);
+
+ d->netdev.data->state = UK_NETDEV_CONFIGURED;
+
+ uk_printd(DLVL_INFO,
+ "PCI:%02x:%02x: Configured (features=0x%x, irq=%lu)\n",
+ d->dev->addr.bus, d->dev->addr.devid, host_features, d->dev->irq);
+
+ return 0;
+}
+
+int virtio_net_enable_rx_intr(struct uk_netdev *n,
+ uint16_t rx_queue_id __unused)
+{
+ struct virtio_net_device *d;
+
+ UK_ASSERT(n != NULL);
+ d = __containerof(n, struct virtio_net_device, netdev);
+ d->recv_intr_enabled = 1;
+ d->recvq.avail->flags &= ~VIRTQ_AVAIL_F_NO_INTERRUPT;
+ return 0;
+}
+
+int virtio_net_disable_rx_intr(struct uk_netdev *n,
+ uint16_t rx_queue_id __unused)
+{
+ struct virtio_net_device *d;
+
+ UK_ASSERT(n != NULL);
+ d = __containerof(n, struct virtio_net_device, netdev);
+ d->recv_intr_enabled = 0;
+ d->recvq.avail->flags |= VIRTQ_AVAIL_F_NO_INTERRUPT;
+ return 0;
+}
+
+static void virtio_net_thread(void *arg)
+{
+ struct virtio_net_device *d = arg;
+ struct uk_netdev *n;
+
+ UK_ASSERT(d != NULL);
+ n = &d->netdev;
+
+ while (n->data->state == UK_NETDEV_RUNNING) {
+ uk_waitq_wait_event(&d->wq,
+ d->recvq.last_used != d->recvq.used->idx);
+ n->rx_cb(n, 0);
+ }
+}
+
+int virtio_net_start(struct uk_netdev *n)
+{
+ struct virtio_net_device *d;
+ char buf[UK_NETDEV_NAME_MAX_LEN];
+
+ UK_ASSERT(n != NULL);
+ d = __containerof(n, struct virtio_net_device, netdev);
+
+ sprintf(buf, "virtio-net%d", n->data->id);
+ uk_netdev_name_set(n, buf, (uint16_t)strlen(buf));
+ uk_printd(DLVL_INFO, "%s started\n", buf);
+
+ d->netdev.data->state = UK_NETDEV_RUNNING;
+
+ /* Start the thread that handles packet RX callbacks */
+ if (n->rx_cb != NULL) {
+ uk_waitq_init(&d->wq);
+ d->thread = uk_thread_create(buf, virtio_net_thread, d);
+ if (d->thread == NULL) {
+ uk_printd(DLVL_ERR, "Error creating %s thread.", buf);
+ return -ENOMEM;
+ }
+ }
+
+ /*
+ * By default, interrupts are disabled and it is up to the user or
+ * network stack to manually enable them with a call to
+ * enable_tx|rx_intr()
+ */
+ d->recv_intr_enabled = 0;
+ d->recvq.avail->flags |= VIRTQ_AVAIL_F_NO_INTERRUPT;
+ d->xmitq.avail->flags |= VIRTQ_AVAIL_F_NO_INTERRUPT;
+
+ return 0;
+}
+
+void virtio_net_stop(struct uk_netdev *n)
+{
+ struct virtio_net_device *d;
+
+ UK_ASSERT(n != NULL);
+ d = __containerof(n, struct virtio_net_device, netdev);
+
+ d->netdev.data->state = UK_NETDEV_CONFIGURED;
+}
+
+void virtio_net_close(struct uk_netdev *n)
+{
+ struct virtio_net_device *d;
+
+ UK_ASSERT(n != NULL);
+ d = __containerof(n, struct virtio_net_device, netdev);
+
+ d->netdev.data->state = UK_NETDEV_UNCONFIGURED;
+}
+
+static const struct uk_netdev_ops virtio_netdev_ops = {
+ .dev_configure = virtio_netdev_configure,
+ .rx_queue_setup = virtio_netdev_rx_queue_setup,
+ .tx_queue_setup = virtio_netdev_tx_queue_setup,
+ .dev_start = virtio_net_start,
+ .dev_stop = virtio_net_stop,
+ .dev_close = virtio_net_close,
+ .rx_enable_intr = virtio_net_enable_rx_intr,
+ .rx_disable_intr = virtio_net_disable_rx_intr,
+};
+
+static int virtio_net_add_dev(struct pci_device *dev)
+{
+ struct virtio_net_device *d;
+ int err;
+
+ UK_ASSERT(dev != NULL);
+
+ d = uk_malloc(a, sizeof(*d));
+ if (!d) {
+ err = -ENOMEM;
+ goto err_out;
+ }
+
+ d->dev = dev;
+
+ /* register netdev */
+ d->netdev.rx_pkt = virtio_netdev_recv;
+ d->netdev.tx_pkt = virtio_netdev_xmit;
+ d->netdev.dev_ops = &virtio_netdev_ops;
+
+ d->netdev.data = "" sizeof(struct uk_netdev_data));
+ d->netdev.data->state = UK_NETDEV_UNCONFIGURED;
+ d->netdev.data->mtu = PKT_BUFFER_LEN;
+
+ uk_netdev_register(&d->netdev);
+
+ return 0;
+
+err_out:
+ return err;
+}
+
+static int virtio_net_drv_init(struct uk_alloc *drv_allocator)
+{
+ /* driver initialization */
+ if (!drv_allocator)
+ return -EINVAL;
+
+ a = drv_allocator;
+ return 0;
+}
+
+static const struct pci_device_id pci_id_map[] = {
+ {PCI_CLASS_ANY_ID, VENDOR_QUMRANET_VIRTIO, PCI_ANY_ID, PCI_ANY_ID,
+ PCI_CONF_SUBSYS_NET},
+ {PCI_ANY_DEVICE_ID},
+};
+
+static struct pci_driver virtio_net_drv = {
+ .device_ids = pci_id_map,
+ .init = virtio_net_drv_init,
+ .add_dev = virtio_net_add_dev
+};
+
+PCI_REGISTER_DRIVER(&virtio_net_drv);
diff --git a/plat/kvm/Config.uk b/plat/kvm/Config.uk
index 118954d..4526925 100644
--- a/plat/kvm/Config.uk
+++ b/plat/kvm/Config.uk
@@ -19,10 +19,14 @@ config KVM_PCI
PCI bus driver for probing and operating PCI devices
if (KVM_PCI)
-config KVM_PCI_VIRTIO
- bool "Virtio Ring"
+menu "Virtio"
+config KVM_PCI_VIRTIONET
+ bool "Virtio Networking"
default n
+ select LIBUKNETDEV
help
- Virtual queues to traverse host and guest transition
+ Paravirtualized networking driver
+
+endmenu
endif
endif
diff --git a/plat/kvm/Makefile.uk b/plat/kvm/Makefile.uk
index e379c83..d761588 100644
--- a/plat/kvm/Makefile.uk
+++ b/plat/kvm/Makefile.uk
@@ -8,7 +8,7 @@ $(eval $(call addplat_s,kvm,$(CONFIG_PLAT_KVM)))
##
$(eval $(call addplatlib,kvm,libkvmplat))
$(eval $(call addplatlib_s,kvm,libkvmpci,$(CONFIG_KVM_PCI)))
-$(eval $(call addplatlib_s,kvm,libkvmpcivirtio,$(CONFIG_KVM_PCI_VIRTIO)))
+$(eval $(call addplatlib_s,kvm,libkvmpcivirtionet,$(CONFIG_KVM_PCI_VIRTIONET)))
##
## Platform library definitions
@@ -52,6 +52,9 @@ LIBKVMPCI_SRCS-y += $(UK_PLAT_COMMON_BASE)/pci_bus.c|common
##
## Virtio library definitions
##
-LIBKVMPCIVIRTIO_ASINCLUDES-y += -I$(UK_PLAT_COMMON_BASE)/include
-LIBKVMPCIVIRTIO_CINCLUDES-y += -I$(UK_PLAT_COMMON_BASE)/include
-LIBKVMPCIVIRTIO_SRCS-y += $(UK_PLAT_DRIVERS_BASE)/virtio/virtio_ring.c
+LIBKVMPCIVIRTIONET_ASINCLUDES-y += -I$(LIBKVMPLAT_BASE)/include
+LIBKVMPCIVIRTIONET_CINCLUDES-y += -I$(LIBKVMPLAT_BASE)/include
+LIBKVMPCIVIRTIONET_ASINCLUDES-y += -I$(UK_PLAT_COMMON_BASE)/include
+LIBKVMPCIVIRTIONET_CINCLUDES-y += -I$(UK_PLAT_COMMON_BASE)/include
+LIBKVMPCIVIRTIONET_SRCS-y += $(UK_PLAT_DRIVERS_BASE)/virtio/virtio_ring.c
+LIBKVMPCIVIRTIONET_SRCS-y += $(UK_PLAT_DRIVERS_BASE)/virtio/virtio_net.c
--
2.7.4
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