[dpdk-dev] [PATCH v2 3/5] virtio/vdev: add embeded device emulation
Jianfeng Tan
jianfeng.tan at intel.com
Fri Feb 5 12:20:26 CET 2016
To implement virtio vdev, we need way to interract with vhost backend.
And more importantly, needs way to emulate a device into DPDK. So this
patch acts as embedded device emulation.
Depends on the type of vhost file: vhost-user is used if the given
path points to a unix socket; vhost-net is used if the given path
points to a char device.
Signed-off-by: Huawei Xie <huawei.xie at intel.com>
Signed-off-by: Jianfeng Tan <jianfeng.tan at intel.com>
---
config/common_linuxapp | 5 +
drivers/net/virtio/Makefile | 4 +
drivers/net/virtio/vhost.h | 194 +++++++++
drivers/net/virtio/vhost_embedded.c | 809 ++++++++++++++++++++++++++++++++++++
drivers/net/virtio/virtio_ethdev.h | 6 +-
drivers/net/virtio/virtio_pci.h | 15 +-
6 files changed, 1031 insertions(+), 2 deletions(-)
create mode 100644 drivers/net/virtio/vhost.h
create mode 100644 drivers/net/virtio/vhost_embedded.c
diff --git a/config/common_linuxapp b/config/common_linuxapp
index 74bc515..f76e162 100644
--- a/config/common_linuxapp
+++ b/config/common_linuxapp
@@ -534,3 +534,8 @@ CONFIG_RTE_APP_TEST=y
CONFIG_RTE_TEST_PMD=y
CONFIG_RTE_TEST_PMD_RECORD_CORE_CYCLES=n
CONFIG_RTE_TEST_PMD_RECORD_BURST_STATS=n
+
+#
+# Enable virtio support for container
+#
+CONFIG_RTE_VIRTIO_VDEV=y
diff --git a/drivers/net/virtio/Makefile b/drivers/net/virtio/Makefile
index 43835ba..ef920f9 100644
--- a/drivers/net/virtio/Makefile
+++ b/drivers/net/virtio/Makefile
@@ -52,6 +52,10 @@ SRCS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += virtio_rxtx.c
SRCS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += virtio_ethdev.c
SRCS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += virtio_rxtx_simple.c
+ifeq ($(CONFIG_RTE_VIRTIO_VDEV),y)
+ SRCS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += vhost_embedded.c
+endif
+
# this lib depends upon:
DEPDIRS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += lib/librte_eal lib/librte_ether
DEPDIRS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += lib/librte_mempool lib/librte_mbuf
diff --git a/drivers/net/virtio/vhost.h b/drivers/net/virtio/vhost.h
new file mode 100644
index 0000000..73d4f5c
--- /dev/null
+++ b/drivers/net/virtio/vhost.h
@@ -0,0 +1,194 @@
+/*-
+ * 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.
+ */
+
+#ifndef _VHOST_NET_USER_H
+#define _VHOST_NET_USER_H
+
+#include <stdint.h>
+#include <linux/types.h>
+#include <linux/ioctl.h>
+
+#define VHOST_MEMORY_MAX_NREGIONS 8
+
+struct vhost_vring_state {
+ unsigned int index;
+ unsigned int num;
+};
+
+struct vhost_vring_file {
+ unsigned int index;
+ int fd;
+};
+
+struct vhost_vring_addr {
+ unsigned int index;
+ /* Option flags. */
+ unsigned int flags;
+ /* Flag values: */
+ /* Whether log address is valid. If set enables logging. */
+#define VHOST_VRING_F_LOG 0
+
+ /* Start of array of descriptors (virtually contiguous) */
+ uint64_t desc_user_addr;
+ /* Used structure address. Must be 32 bit aligned */
+ uint64_t used_user_addr;
+ /* Available structure address. Must be 16 bit aligned */
+ uint64_t avail_user_addr;
+ /* Logging support. */
+ /* Log writes to used structure, at offset calculated from specified
+ * address. Address must be 32 bit aligned.
+ */
+ uint64_t log_guest_addr;
+};
+
+#define VIRTIO_CONFIG_S_DRIVER_OK 4
+
+enum vhost_user_request {
+ VHOST_USER_NONE = 0,
+ VHOST_USER_GET_FEATURES = 1,
+ VHOST_USER_SET_FEATURES = 2,
+ VHOST_USER_SET_OWNER = 3,
+ VHOST_USER_RESET_OWNER = 4,
+ VHOST_USER_SET_MEM_TABLE = 5,
+ VHOST_USER_SET_LOG_BASE = 6,
+ VHOST_USER_SET_LOG_FD = 7,
+ VHOST_USER_SET_VRING_NUM = 8,
+ VHOST_USER_SET_VRING_ADDR = 9,
+ VHOST_USER_SET_VRING_BASE = 10,
+ VHOST_USER_GET_VRING_BASE = 11,
+ VHOST_USER_SET_VRING_KICK = 12,
+ VHOST_USER_SET_VRING_CALL = 13,
+ VHOST_USER_SET_VRING_ERR = 14,
+ VHOST_USER_GET_PROTOCOL_FEATURES = 15,
+ VHOST_USER_SET_PROTOCOL_FEATURES = 16,
+ VHOST_USER_GET_QUEUE_NUM = 17,
+ VHOST_USER_SET_VRING_ENABLE = 18,
+ VHOST_USER_MAX
+};
+
+struct vhost_memory_region {
+ uint64_t guest_phys_addr;
+ uint64_t memory_size; /* bytes */
+ uint64_t userspace_addr;
+ uint64_t mmap_offset;
+};
+
+struct vhost_memory_kernel {
+ uint32_t nregions;
+ uint32_t padding;
+ struct vhost_memory_region regions[0];
+};
+
+struct vhost_memory {
+ uint32_t nregions;
+ uint32_t padding;
+ struct vhost_memory_region regions[VHOST_MEMORY_MAX_NREGIONS];
+};
+
+struct vhost_user_msg {
+ enum vhost_user_request request;
+
+#define VHOST_USER_VERSION_MASK 0x3
+#define VHOST_USER_REPLY_MASK (0x1 << 2)
+ uint32_t flags;
+ uint32_t size; /* the following payload size */
+ union {
+#define VHOST_USER_VRING_IDX_MASK 0xff
+#define VHOST_USER_VRING_NOFD_MASK (0x1 << 8)
+ uint64_t u64;
+ struct vhost_vring_state state;
+ struct vhost_vring_addr addr;
+ struct vhost_memory memory;
+ } payload;
+ int fds[VHOST_MEMORY_MAX_NREGIONS];
+} __attribute((packed));
+
+#define VHOST_USER_HDR_SIZE offsetof(struct vhost_user_msg, payload.u64)
+#define VHOST_USER_PAYLOAD_SIZE (sizeof(struct vhost_user_msg) - VHOST_USER_HDR_SIZE)
+
+/* The version of the protocol we support */
+#define VHOST_USER_VERSION 0x1
+
+/* ioctls */
+
+#define VHOST_VIRTIO 0xAF
+
+#define VHOST_GET_FEATURES _IOR(VHOST_VIRTIO, 0x00, __u64)
+#define VHOST_SET_FEATURES _IOW(VHOST_VIRTIO, 0x00, __u64)
+#define VHOST_SET_OWNER _IO(VHOST_VIRTIO, 0x01)
+#define VHOST_RESET_OWNER _IO(VHOST_VIRTIO, 0x02)
+#define VHOST_SET_MEM_TABLE _IOW(VHOST_VIRTIO, 0x03, struct vhost_memory_kernel)
+#define VHOST_SET_LOG_BASE _IOW(VHOST_VIRTIO, 0x04, __u64)
+#define VHOST_SET_LOG_FD _IOW(VHOST_VIRTIO, 0x07, int)
+#define VHOST_SET_VRING_NUM _IOW(VHOST_VIRTIO, 0x10, struct vhost_vring_state)
+#define VHOST_SET_VRING_ADDR _IOW(VHOST_VIRTIO, 0x11, struct vhost_vring_addr)
+#define VHOST_SET_VRING_BASE _IOW(VHOST_VIRTIO, 0x12, struct vhost_vring_state)
+#define VHOST_GET_VRING_BASE _IOWR(VHOST_VIRTIO, 0x12, struct vhost_vring_state)
+#define VHOST_SET_VRING_KICK _IOW(VHOST_VIRTIO, 0x20, struct vhost_vring_file)
+#define VHOST_SET_VRING_CALL _IOW(VHOST_VIRTIO, 0x21, struct vhost_vring_file)
+#define VHOST_SET_VRING_ERR _IOW(VHOST_VIRTIO, 0x22, struct vhost_vring_file)
+#define VHOST_NET_SET_BACKEND _IOW(VHOST_VIRTIO, 0x30, struct vhost_vring_file)
+
+/*****************************************************************************/
+
+/* Ioctl defines */
+#define TUNSETIFF _IOW('T', 202, int)
+#define TUNGETFEATURES _IOR('T', 207, unsigned int)
+#define TUNSETOFFLOAD _IOW('T', 208, unsigned int)
+#define TUNGETIFF _IOR('T', 210, unsigned int)
+#define TUNSETSNDBUF _IOW('T', 212, int)
+#define TUNGETVNETHDRSZ _IOR('T', 215, int)
+#define TUNSETVNETHDRSZ _IOW('T', 216, int)
+#define TUNSETQUEUE _IOW('T', 217, int)
+#define TUNSETVNETLE _IOW('T', 220, int)
+#define TUNSETVNETBE _IOW('T', 222, int)
+
+/* TUNSETIFF ifr flags */
+#define IFF_TAP 0x0002
+#define IFF_NO_PI 0x1000
+#define IFF_ONE_QUEUE 0x2000
+#define IFF_VNET_HDR 0x4000
+#define IFF_MULTI_QUEUE 0x0100
+#define IFF_ATTACH_QUEUE 0x0200
+#define IFF_DETACH_QUEUE 0x0400
+
+/* Features for GSO (TUNSETOFFLOAD). */
+#define TUN_F_CSUM 0x01 /* You can hand me unchecksummed packets. */
+#define TUN_F_TSO4 0x02 /* I can handle TSO for IPv4 packets */
+#define TUN_F_TSO6 0x04 /* I can handle TSO for IPv6 packets */
+#define TUN_F_TSO_ECN 0x08 /* I can handle TSO with ECN bits. */
+#define TUN_F_UFO 0x10 /* I can handle UFO packets */
+
+#define PATH_NET_TUN "/dev/net/tun"
+
+#endif
diff --git a/drivers/net/virtio/vhost_embedded.c b/drivers/net/virtio/vhost_embedded.c
new file mode 100644
index 0000000..0073b86
--- /dev/null
+++ b/drivers/net/virtio/vhost_embedded.c
@@ -0,0 +1,809 @@
+/*-
+ * 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 <sys/socket.h>
+#include <sys/un.h>
+#include <stdio.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <string.h>
+#include <errno.h>
+#include <assert.h>
+#include <sys/mman.h>
+#include <unistd.h>
+#include <sys/eventfd.h>
+#include <sys/ioctl.h>
+#include <net/if.h>
+
+#include <rte_mbuf.h>
+#include <rte_memory.h>
+#include <rte_eal_memconfig.h>
+
+#include "virtio_pci.h"
+#include "virtio_logs.h"
+#include "virtio_ethdev.h"
+#include "virtqueue.h"
+#include "vhost.h"
+
+static int
+vhost_user_write(int fd, void *buf, int len, int *fds, int fd_num)
+{
+ int r;
+ struct msghdr msgh;
+ struct iovec iov;
+ size_t fd_size = fd_num * sizeof(int);
+ char control[CMSG_SPACE(fd_size)];
+ struct cmsghdr *cmsg;
+
+ bzero(&msgh, sizeof(msgh));
+ bzero(control, sizeof(control));
+
+ iov.iov_base = (uint8_t *)buf;
+ iov.iov_len = len;
+
+ msgh.msg_iov = &iov;
+ msgh.msg_iovlen = 1;
+ msgh.msg_control = control;
+ msgh.msg_controllen = sizeof(control);
+
+ cmsg = CMSG_FIRSTHDR(&msgh);
+ cmsg->cmsg_len = CMSG_LEN(fd_size);
+ cmsg->cmsg_level = SOL_SOCKET;
+ cmsg->cmsg_type = SCM_RIGHTS;
+ memcpy(CMSG_DATA(cmsg), fds, fd_size);
+
+ do {
+ r = sendmsg(fd, &msgh, 0);
+ } while (r < 0 && errno == EINTR);
+
+ return r;
+}
+
+static int
+vhost_user_read(int fd, struct vhost_user_msg *msg)
+{
+ uint32_t valid_flags = VHOST_USER_REPLY_MASK | VHOST_USER_VERSION;
+ int ret, sz_hdr = VHOST_USER_HDR_SIZE, sz_payload;
+
+ ret = recv(fd, (void *)msg, sz_hdr, 0);
+ if (ret < sz_hdr) {
+ PMD_DRV_LOG(ERR, "Failed to recv msg hdr: %d instead of %d.",
+ ret, sz_hdr);
+ goto fail;
+ }
+
+ /* validate msg flags */
+ if (msg->flags != (valid_flags)) {
+ PMD_DRV_LOG(ERR, "Failed to recv msg: flags %x instead of %x.",
+ msg->flags, valid_flags);
+ goto fail;
+ }
+
+ sz_payload = msg->size;
+ if (sz_payload) {
+ ret = recv(fd, (void *)((char *)msg + sz_hdr), sz_payload, 0);
+ if (ret < sz_payload) {
+ PMD_DRV_LOG(ERR, "Failed to recv msg payload: %d instead of %d.",
+ ret, msg->size);
+ goto fail;
+ }
+ }
+
+ return 0;
+
+fail:
+ return -1;
+}
+
+static struct vhost_user_msg m __rte_unused;
+
+static void
+prepare_vhost_memory_user(struct vhost_user_msg *msg, int fds[])
+{
+ int i, num;
+ struct back_file *huges;
+ struct vhost_memory_region *mr;
+
+ num = rte_eal_get_backfile_info(&huges);
+
+ if (num > VHOST_MEMORY_MAX_NREGIONS)
+ rte_panic("%d files exceed maximum of %d for vhost-user\n",
+ num, VHOST_MEMORY_MAX_NREGIONS);
+
+ for (i = 0; i < num; ++i) {
+ mr = &msg->payload.memory.regions[i];
+ mr->guest_phys_addr = (uint64_t)huges[i].addr; /* use vaddr! */
+ mr->userspace_addr = (uint64_t)huges[i].addr;
+ mr->memory_size = huges[i].size;
+ mr->mmap_offset = 0;
+ fds[i] = open(huges[i].filepath, O_RDWR);
+ }
+
+ msg->payload.memory.nregions = num;
+ msg->payload.memory.padding = 0;
+ free(huges);
+}
+
+static int
+vhost_user_sock(struct virtio_hw *hw, unsigned long int req, void *arg)
+{
+ struct vhost_user_msg msg;
+ struct vhost_vring_file *file = 0;
+ int need_reply = 0;
+ int fds[VHOST_MEMORY_MAX_NREGIONS];
+ int fd_num = 0;
+ int i, len;
+
+ msg.request = req;
+ msg.flags = VHOST_USER_VERSION;
+ msg.size = 0;
+
+ switch (req) {
+ case VHOST_USER_GET_FEATURES:
+ need_reply = 1;
+ break;
+
+ case VHOST_USER_SET_FEATURES:
+ case VHOST_USER_SET_LOG_BASE:
+ msg.payload.u64 = *((__u64 *)arg);
+ msg.size = sizeof(m.payload.u64);
+ break;
+
+ case VHOST_USER_SET_OWNER:
+ case VHOST_USER_RESET_OWNER:
+ break;
+
+ case VHOST_USER_SET_MEM_TABLE:
+ prepare_vhost_memory_user(&msg, fds);
+ fd_num = msg.payload.memory.nregions;
+ msg.size = sizeof(m.payload.memory.nregions);
+ msg.size += sizeof(m.payload.memory.padding);
+ msg.size += fd_num * sizeof(struct vhost_memory_region);
+ break;
+
+ case VHOST_USER_SET_LOG_FD:
+ fds[fd_num++] = *((int *)arg);
+ break;
+
+ case VHOST_USER_SET_VRING_NUM:
+ case VHOST_USER_SET_VRING_BASE:
+ memcpy(&msg.payload.state, arg, sizeof(msg.payload.state));
+ msg.size = sizeof(m.payload.state);
+ break;
+
+ case VHOST_USER_GET_VRING_BASE:
+ memcpy(&msg.payload.state, arg, sizeof(msg.payload.state));
+ msg.size = sizeof(m.payload.state);
+ need_reply = 1;
+ break;
+
+ case VHOST_USER_SET_VRING_ADDR:
+ memcpy(&msg.payload.addr, arg, sizeof(msg.payload.addr));
+ msg.size = sizeof(m.payload.addr);
+ break;
+
+ case VHOST_USER_SET_VRING_KICK:
+ case VHOST_USER_SET_VRING_CALL:
+ case VHOST_USER_SET_VRING_ERR:
+ file = arg;
+ msg.payload.u64 = file->index & VHOST_USER_VRING_IDX_MASK;
+ msg.size = sizeof(m.payload.u64);
+ if (file->fd > 0)
+ fds[fd_num++] = file->fd;
+ else
+ msg.payload.u64 |= VHOST_USER_VRING_NOFD_MASK;
+ break;
+
+ default:
+ PMD_DRV_LOG(ERR, "vhost-user trying to send unhandled msg type");
+ return -1;
+ }
+
+ len = VHOST_USER_HDR_SIZE + msg.size;
+ if (vhost_user_write(hw->vhostfd, &msg, len, fds, fd_num) < 0)
+ return 0;
+
+ if (req == VHOST_USER_SET_MEM_TABLE)
+ for (i = 0; i < fd_num; ++i)
+ close(fds[i]);
+
+ if (need_reply) {
+ if (vhost_user_read(hw->vhostfd, &msg) < 0)
+ return -1;
+
+ if (req != msg.request) {
+ PMD_DRV_LOG(ERR, "Received unexpected msg type.");
+ return -1;
+ }
+
+ switch (req) {
+ case VHOST_USER_GET_FEATURES:
+ if (msg.size != sizeof(m.payload.u64)) {
+ PMD_DRV_LOG(ERR, "Received bad msg size.");
+ return -1;
+ }
+ *((__u64 *)arg) = msg.payload.u64;
+ break;
+ case VHOST_USER_GET_VRING_BASE:
+ if (msg.size != sizeof(m.payload.state)) {
+ PMD_DRV_LOG(ERR, "Received bad msg size.");
+ return -1;
+ }
+ memcpy(arg, &msg.payload.state,
+ sizeof(struct vhost_vring_state));
+ break;
+ default:
+ PMD_DRV_LOG(ERR, "Received unexpected msg type.");
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+static int
+vhost_kernel_ioctl(struct virtio_hw *hw, unsigned long int req, void *arg)
+{
+ return ioctl(hw->vhostfd, req, arg);
+}
+
+enum {
+ VHOST_MSG_SET_OWNER,
+ VHOST_MSG_SET_FEATURES,
+ VHOST_MSG_GET_FEATURES,
+ VHOST_MSG_SET_VRING_CALL,
+ VHOST_MSG_SET_VRING_NUM,
+ VHOST_MSG_SET_VRING_BASE,
+ VHOST_MSG_GET_VRING_BASE,
+ VHOST_MSG_SET_VRING_ADDR,
+ VHOST_MSG_SET_VRING_KICK,
+ VHOST_MSG_SET_MEM_TABLE,
+ VHOST_MSG_MAX,
+};
+
+static const char * const vhost_msg_strings[] = {
+ [VHOST_MSG_SET_OWNER] = "VHOST_MSG_SET_OWNER",
+ [VHOST_MSG_SET_FEATURES] = "VHOST_MSG_SET_FEATURES",
+ [VHOST_MSG_GET_FEATURES] = "VHOST_MSG_GET_FEATURES",
+ [VHOST_MSG_SET_VRING_CALL] = "VHOST_MSG_SET_VRING_CALL",
+ [VHOST_MSG_SET_VRING_NUM] = "VHOST_MSG_SET_VRING_NUM",
+ [VHOST_MSG_SET_VRING_BASE] = "VHOST_MSG_SET_VRING_BASE",
+ [VHOST_MSG_GET_VRING_BASE] = "VHOST_MSG_GET_VRING_BASE",
+ [VHOST_MSG_SET_VRING_ADDR] = "VHOST_MSG_SET_VRING_ADDR",
+ [VHOST_MSG_SET_VRING_KICK] = "VHOST_MSG_SET_VRING_KICK",
+ [VHOST_MSG_SET_MEM_TABLE] = "VHOST_MSG_SET_MEM_TABLE",
+ NULL,
+};
+
+static unsigned long int vhost_req_map[][2] = {
+ [VHOST_MSG_SET_OWNER] = {
+ VHOST_SET_OWNER, VHOST_USER_SET_OWNER
+ },
+ [VHOST_MSG_SET_FEATURES] = {
+ VHOST_SET_FEATURES, VHOST_USER_SET_FEATURES
+ },
+ [VHOST_MSG_GET_FEATURES] = {
+ VHOST_GET_FEATURES, VHOST_USER_GET_FEATURES
+ },
+ [VHOST_MSG_SET_VRING_CALL] = {
+ VHOST_SET_VRING_CALL, VHOST_USER_SET_VRING_CALL
+ },
+ [VHOST_MSG_SET_VRING_NUM] = {
+ VHOST_SET_VRING_NUM, VHOST_USER_SET_VRING_NUM
+ },
+ [VHOST_MSG_SET_VRING_BASE] = {
+ VHOST_SET_VRING_BASE, VHOST_USER_SET_VRING_BASE
+ },
+ [VHOST_MSG_GET_VRING_BASE] = {
+ VHOST_GET_VRING_BASE, VHOST_USER_GET_VRING_BASE
+ },
+ [VHOST_MSG_SET_VRING_ADDR] = {
+ VHOST_SET_VRING_ADDR, VHOST_USER_SET_VRING_ADDR
+ },
+ [VHOST_MSG_SET_VRING_KICK] = {
+ VHOST_SET_VRING_KICK, VHOST_USER_SET_VRING_KICK
+ },
+ [VHOST_MSG_SET_MEM_TABLE] = {
+ VHOST_SET_MEM_TABLE, VHOST_USER_SET_MEM_TABLE
+ },
+};
+
+static int
+vhost_call(struct virtio_hw *hw, unsigned long int req_orig, void *arg)
+{
+ unsigned long int req_new;
+ int ret;
+
+ if (req_orig >= VHOST_MSG_MAX)
+ rte_panic("invalid req: %lu\n", req_orig);
+
+ PMD_DRV_LOG(INFO, "%s\n", vhost_msg_strings[req_orig]);
+ req_new = vhost_req_map[req_orig][hw->type];
+ if (hw->type == VHOST_USER)
+ ret = vhost_user_sock(hw, req_new, arg);
+ else
+ ret = vhost_kernel_ioctl(hw, req_new, arg);
+
+ if (ret < 0)
+ rte_panic("vhost_call %s failed: %s\n",
+ vhost_msg_strings[req_orig], strerror(errno));
+
+ return ret;
+}
+
+static void
+kick_one_vq(struct virtio_hw *hw, struct virtqueue *vq, unsigned queue_sel)
+{
+ int callfd, kickfd;
+ struct vhost_vring_file file;
+ struct vhost_vring_state state;
+ struct vhost_vring_addr addr = {
+ .index = queue_sel,
+ .desc_user_addr = (uint64_t)(uintptr_t)vq->vq_ring.desc,
+ .avail_user_addr = (uint64_t)(uintptr_t)vq->vq_ring.avail,
+ .used_user_addr = (uint64_t)(uintptr_t)vq->vq_ring.used,
+ .log_guest_addr = 0,
+ .flags = 0, /* disable log */
+ };
+
+ /* or use invalid flag to disable it, but vhost-dpdk uses this to judge
+ * if dev is alive. so finally we need two real event_fds.
+ */
+ /* Of all per virtqueue MSGs, make sure VHOST_SET_VRING_CALL come
+ * firstly because vhost depends on this msg to allocate virtqueue
+ * pair.
+ */
+ callfd = eventfd(0, O_CLOEXEC | O_NONBLOCK);
+ if (callfd < 0)
+ rte_panic("callfd error, %s\n", strerror(errno));
+
+ file.index = queue_sel;
+ file.fd = callfd;
+ vhost_call(hw, VHOST_MSG_SET_VRING_CALL, &file);
+ hw->callfds[queue_sel] = callfd;
+
+ state.index = queue_sel;
+ state.num = vq->vq_ring.num;
+ vhost_call(hw, VHOST_MSG_SET_VRING_NUM, &state);
+
+ state.num = 0; /* no reservation */
+ vhost_call(hw, VHOST_MSG_SET_VRING_BASE, &state);
+
+ vhost_call(hw, VHOST_MSG_SET_VRING_ADDR, &addr);
+
+ /* Of all per virtqueue MSGs, make sure VHOST_SET_VRING_KICK comes
+ * lastly because vhost depends on this msg to judge if
+ * virtio_is_ready().
+ */
+ kickfd = eventfd(0, O_CLOEXEC | O_NONBLOCK);
+ if (kickfd < 0)
+ rte_panic("kickfd error, %s\n", strerror(errno));
+
+ file.fd = kickfd;
+ vhost_call(hw, VHOST_MSG_SET_VRING_KICK, &file);
+ hw->kickfds[queue_sel] = kickfd;
+}
+
+/**
+ * Merge those virtually adjacent memsegs into one region.
+ */
+static void
+prepare_vhost_memory_kernel(struct vhost_memory_kernel **p_vm)
+{
+ unsigned i, j, k = 0;
+ struct rte_memseg *seg;
+ struct vhost_memory_region *mr;
+ struct vhost_memory_kernel *vm;
+
+ vm = malloc(sizeof(struct vhost_memory_kernel) +
+ RTE_MAX_MEMSEG * sizeof(struct vhost_memory_region));
+
+ for (i = 0; i < RTE_MAX_MEMSEG; ++i) {
+ seg = &rte_eal_get_configuration()->mem_config->memseg[i];
+ if (!seg->addr)
+ break;
+
+ int new_region = 1;
+
+ for (j = 0; j < k; ++j) {
+ mr = &vm->regions[j];
+
+ if (mr->userspace_addr + mr->memory_size ==
+ (uint64_t)seg->addr) {
+ mr->memory_size += seg->len;
+ new_region = 0;
+ break;
+ }
+
+ if ((uint64_t)seg->addr + seg->len ==
+ mr->userspace_addr) {
+ mr->guest_phys_addr = (uint64_t)seg->addr;
+ mr->userspace_addr = (uint64_t)seg->addr;
+ mr->memory_size += seg->len;
+ new_region = 0;
+ break;
+ }
+ }
+
+ if (new_region == 0)
+ continue;
+
+ mr = &vm->regions[k++];
+ mr->guest_phys_addr = (uint64_t)seg->addr; /* use vaddr here! */
+ mr->userspace_addr = (uint64_t)seg->addr;
+ mr->memory_size = seg->len;
+ mr->mmap_offset = 0;
+ }
+
+ vm->nregions = k;
+ vm->padding = 0;
+ *p_vm = vm;
+}
+
+static void kick_all_vq(struct virtio_hw *hw)
+{
+ uint64_t features;
+ unsigned i, queue_sel, nvqs;
+ struct rte_eth_dev_data *data = hw->data;
+
+ if (hw->type == VHOST_KERNEL) {
+ struct vhost_memory_kernel *vm = NULL;
+
+ prepare_vhost_memory_kernel(&vm);
+ vhost_call(hw, VHOST_MSG_SET_MEM_TABLE, vm);
+ free(vm);
+ } else {
+ /* construct vhost_memory inside prepare_vhost_memory_user() */
+ vhost_call(hw, VHOST_MSG_SET_MEM_TABLE, NULL);
+ }
+
+ for (i = 0; i < data->nb_rx_queues; ++i) {
+ queue_sel = 2 * i + VTNET_SQ_RQ_QUEUE_IDX;
+ kick_one_vq(hw, data->rx_queues[i], queue_sel);
+ }
+ for (i = 0; i < data->nb_tx_queues; ++i) {
+ queue_sel = 2 * i + VTNET_SQ_TQ_QUEUE_IDX;
+ kick_one_vq(hw, data->tx_queues[i], queue_sel);
+ }
+
+ /* after setup all virtqueues, we need to set_features again
+ * so that these features can be set into each virtqueue in
+ * vhost side.
+ */
+ features = hw->guest_features;
+ features &= ~(1ull << VIRTIO_NET_F_MAC);
+ vhost_call(hw, VHOST_MSG_SET_FEATURES, &features);
+ if (hw->type == VHOST_KERNEL)
+ if (ioctl(hw->backfd, TUNSETVNETHDRSZ,
+ &hw->vtnet_hdr_size) == -1)
+ rte_panic("TUNSETVNETHDRSZ failed: %s\n",
+ strerror(errno));
+ PMD_DRV_LOG(INFO, "set features:%" PRIx64 "\n", features);
+
+ if (hw->type == VHOST_KERNEL) {
+ struct vhost_vring_file file;
+
+ file.fd = hw->backfd;
+ nvqs = data->nb_rx_queues + data->nb_tx_queues;
+ for (file.index = 0; file.index < nvqs; ++file.index) {
+ if (vhost_kernel_ioctl(hw, VHOST_NET_SET_BACKEND,
+ &file) < 0)
+ rte_panic("VHOST_NET_SET_BACKEND failed, %s\n",
+ strerror(errno));
+ }
+ }
+}
+
+static void
+vdev_read_dev_config(struct virtio_hw *hw, uint64_t offset,
+ void *dst, int length)
+{
+ if (offset == offsetof(struct virtio_net_config, mac) &&
+ length == ETHER_ADDR_LEN) {
+ int i;
+
+ for (i = 0; i < ETHER_ADDR_LEN; ++i)
+ ((uint8_t *)dst)[i] = hw->mac_addr[i];
+ return;
+ }
+
+ if (offset == offsetof(struct virtio_net_config, status))
+ *(uint16_t *)dst = hw->status;
+
+ if (offset == offsetof(struct virtio_net_config, max_virtqueue_pairs))
+ *(uint16_t *)dst = hw->max_tx_queues;
+}
+
+static void
+vdev_write_dev_config(struct virtio_hw *hw, uint64_t offset,
+ const void *src, int length)
+{
+ int i;
+
+ if ((offset == offsetof(struct virtio_net_config, mac)) &&
+ (length == ETHER_ADDR_LEN))
+ for (i = 0; i < ETHER_ADDR_LEN; ++i)
+ hw->mac_addr[i] = ((const uint8_t *)src)[i];
+ else
+ rte_panic("offset=%" PRIu64 ", length=%d\n", offset, length);
+}
+
+static void
+vdev_set_status(struct virtio_hw *hw, uint8_t status)
+{
+ if (status & VIRTIO_CONFIG_S_DRIVER_OK)
+ kick_all_vq(hw);
+ hw->status = status;
+}
+
+static void
+vdev_reset(struct virtio_hw *hw __rte_unused)
+{
+ /* do nothing according to qemu vhost user spec */
+}
+
+static uint8_t
+vdev_get_status(struct virtio_hw *hw)
+{
+ return hw->status;
+}
+
+static uint64_t
+vdev_get_features(struct virtio_hw *hw)
+{
+ uint64_t host_features;
+
+ vhost_call(hw, VHOST_MSG_GET_FEATURES, &host_features);
+ if (hw->mac_specified)
+ host_features |= (1ull << VIRTIO_NET_F_MAC);
+ /* disable it until we support CQ */
+ host_features &= ~(1ull << VIRTIO_NET_F_CTRL_VQ);
+ host_features &= ~(1ull << VIRTIO_NET_F_CTRL_RX);
+ return host_features;
+}
+
+static void
+vdev_set_features(struct virtio_hw *hw, uint64_t features)
+{
+ features &= ~(1ull << VIRTIO_NET_F_MAC);
+ vhost_call(hw, VHOST_MSG_SET_FEATURES, &features);
+}
+
+static uint8_t
+vdev_get_isr(struct virtio_hw *hw __rte_unused)
+{
+ rte_panic("");
+}
+
+static uint16_t
+vdev_set_config_irq(struct virtio_hw *hw __rte_unused,
+ uint16_t vec __rte_unused)
+{
+ rte_panic("");
+}
+
+static uint16_t
+vdev_get_queue_num(struct virtio_hw *hw,
+ uint16_t queue_id __rte_unused)
+{
+ return hw->queue_num;
+}
+
+static void
+vdev_setup_queue(struct virtio_hw *hw __rte_unused,
+ struct virtqueue *vq __rte_unused)
+{
+ /* do nothing */
+}
+
+static void
+vdev_del_queue(struct virtio_hw *hw __rte_unused,
+ struct virtqueue *vq)
+{
+ struct vhost_vring_state state = {
+ .index = vq->vq_queue_index,
+ };
+
+ vhost_call(hw, VHOST_MSG_GET_VRING_BASE, &state);
+ PMD_DRV_LOG(DEBUG, "state.num = %d\n", state.num);
+}
+
+static void
+vdev_notify_queue(struct virtio_hw *hw, struct virtqueue *vq)
+{
+ uint64_t buf = 1;
+
+ if (write(hw->kickfds[vq->vq_queue_index],
+ &buf, sizeof(uint64_t)) == -1)
+ rte_panic("%s\n", strerror(errno));
+}
+
+static const struct virtio_pci_ops vdev_ops = {
+ .read_dev_cfg = vdev_read_dev_config,
+ .write_dev_cfg = vdev_write_dev_config,
+ .reset = vdev_reset,
+ .get_status = vdev_get_status,
+ .set_status = vdev_set_status,
+ .get_features = vdev_get_features,
+ .set_features = vdev_set_features,
+ .get_isr = vdev_get_isr,
+ .set_config_irq = vdev_set_config_irq,
+ .get_queue_num = vdev_get_queue_num,
+ .setup_queue = vdev_setup_queue,
+ .del_queue = vdev_del_queue,
+ .notify_queue = vdev_notify_queue,
+};
+
+#define TUN_DEF_SNDBUF (1ull << 20)
+
+static void
+vhost_kernel_backend_setup(struct virtio_hw *hw, char *ifname)
+{
+ int fd;
+ int len = sizeof(struct virtio_net_hdr);
+ int req_mq = 0;
+ int sndbuf = TUN_DEF_SNDBUF;
+ unsigned int features;
+ struct ifreq ifr;
+
+ /* TODO:
+ * 1. get/set offload capability, tap_probe_has_ufo, tap_fd_set_offload
+ * 2. verify we can get/set vnet_hdr_len, tap_probe_vnet_hdr_len
+ * 3. get number of memory regions from vhost module parameter
+ * max_mem_regions, supported in newer version linux kernel
+ */
+
+ fd = open(PATH_NET_TUN, O_RDWR);
+ if (fd < 0)
+ rte_panic("open %s error, %s\n", PATH_NET_TUN, strerror(errno));
+
+ memset(&ifr, 0, sizeof(ifr));
+ ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
+
+ if (ioctl(fd, TUNGETFEATURES, &features) == -1)
+ rte_panic("TUNGETFEATURES failed: %s", strerror(errno));
+
+ if (features & IFF_ONE_QUEUE)
+ ifr.ifr_flags |= IFF_ONE_QUEUE;
+
+ if (features & IFF_VNET_HDR)
+ ifr.ifr_flags |= IFF_VNET_HDR;
+ else
+ rte_panic("vnet_hdr requested, but kernel does not support\n");
+
+ if (req_mq) {
+ if (features & IFF_MULTI_QUEUE)
+ ifr.ifr_flags |= IFF_MULTI_QUEUE;
+ else
+ rte_panic("multiqueue requested, but kernel does not support\n");
+ }
+
+ if (ifname)
+ strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
+ else
+ strncpy(ifr.ifr_name, "tap%d", IFNAMSIZ);
+ if (ioctl(fd, TUNSETIFF, (void *)&ifr) == -1)
+ rte_panic("TUNSETIFF failed: %s", strerror(errno));
+ fcntl(fd, F_SETFL, O_NONBLOCK);
+
+ if (ioctl(fd, TUNSETVNETHDRSZ, &len) == -1)
+ rte_panic("TUNSETVNETHDRSZ failed: %s\n", strerror(errno));
+
+ if (ioctl(fd, TUNSETSNDBUF, &sndbuf) == -1)
+ rte_panic("TUNSETSNDBUF failed: %s", strerror(errno));
+
+ hw->backfd = fd;
+ hw->vhostfd = open(hw->path, O_RDWR);
+ if (hw->vhostfd < 0)
+ rte_panic("open %s failed: %s\n", hw->path, strerror(errno));
+}
+
+static void
+vhost_user_backend_setup(struct virtio_hw *hw)
+{
+ int fd;
+ int flag;
+ struct sockaddr_un un;
+
+ fd = socket(AF_UNIX, SOCK_STREAM, 0);
+ if (fd < 0)
+ rte_panic("socket error, %s\n", strerror(errno));
+
+ flag = fcntl(fd, F_GETFD);
+ fcntl(fd, F_SETFD, flag | FD_CLOEXEC);
+
+ memset(&un, 0, sizeof(un));
+ un.sun_family = AF_UNIX;
+ snprintf(un.sun_path, sizeof(un.sun_path), "%s", hw->path);
+ if (connect(fd, (struct sockaddr *)&un, sizeof(un)) < 0) {
+ PMD_DRV_LOG(ERR, "connect error, %s\n", strerror(errno));
+ rte_panic("connect error, %s\n", strerror(errno));
+ }
+
+ hw->vhostfd = fd;
+}
+
+void
+virtio_vdev_init(struct rte_eth_dev_data *data, char *path,
+ int nb_rx, int nb_tx, int nb_cq __attribute__ ((unused)),
+ int queue_num, char *mac, char *ifname)
+{
+ int i, r;
+ struct stat s;
+ uint32_t tmp[ETHER_ADDR_LEN];
+ struct virtio_hw *hw = data->dev_private;
+
+ hw->vtpci_ops = &vdev_ops;
+ hw->io_base = 0;
+ hw->use_msix = 0;
+ hw->modern = 0;
+
+ hw->data = data;
+ hw->path = strdup(path);
+ hw->max_rx_queues = nb_rx;
+ hw->max_tx_queues = nb_tx;
+ hw->queue_num = queue_num;
+ hw->mac_specified = 0;
+ if (mac) {
+ r = sscanf(mac, "%x:%x:%x:%x:%x:%x", &tmp[0],
+ &tmp[1], &tmp[2], &tmp[3], &tmp[4], &tmp[5]);
+ if (r == ETHER_ADDR_LEN) {
+ for (i = 0; i < ETHER_ADDR_LEN; ++i)
+ hw->mac_addr[i] = (uint8_t)tmp[i];
+ hw->mac_specified = 1;
+ } else
+ PMD_DRV_LOG(WARN, "wrong format of mac: %s", mac);
+ }
+
+ /* TODO: cq */
+
+ if (stat(hw->path, &s) < 0)
+ rte_panic("stat: %s failed, %s\n", hw->path, strerror(errno));
+
+ switch (s.st_mode & S_IFMT) {
+ case S_IFCHR:
+ hw->type = VHOST_KERNEL;
+ vhost_kernel_backend_setup(hw, ifname);
+ break;
+ case S_IFSOCK:
+ hw->type = VHOST_USER;
+ vhost_user_backend_setup(hw);
+ break;
+ default:
+ rte_panic("unknown file type of %s\n", hw->path);
+ }
+ if (vhost_call(hw, VHOST_MSG_SET_OWNER, NULL) == -1)
+ rte_panic("vhost set_owner failed: %s\n", strerror(errno));
+}
diff --git a/drivers/net/virtio/virtio_ethdev.h b/drivers/net/virtio/virtio_ethdev.h
index fed9571..fde77ca 100644
--- a/drivers/net/virtio/virtio_ethdev.h
+++ b/drivers/net/virtio/virtio_ethdev.h
@@ -123,5 +123,9 @@ uint16_t virtio_xmit_pkts_simple(void *tx_queue, struct rte_mbuf **tx_pkts,
#define VTNET_LRO_FEATURES (VIRTIO_NET_F_GUEST_TSO4 | \
VIRTIO_NET_F_GUEST_TSO6 | VIRTIO_NET_F_GUEST_ECN)
-
+#ifdef RTE_VIRTIO_VDEV
+void virtio_vdev_init(struct rte_eth_dev_data *data, char *path, int nb_rx,
+ int nb_tx, int nb_cq, int queue_num, char *mac,
+ char *ifname);
+#endif
#endif /* _VIRTIO_ETHDEV_H_ */
diff --git a/drivers/net/virtio/virtio_pci.h b/drivers/net/virtio/virtio_pci.h
index 0544a07..a8394f8 100644
--- a/drivers/net/virtio/virtio_pci.h
+++ b/drivers/net/virtio/virtio_pci.h
@@ -150,7 +150,6 @@ struct virtqueue;
* rest are per-device feature bits.
*/
#define VIRTIO_TRANSPORT_F_START 28
-#define VIRTIO_TRANSPORT_F_END 32
/* 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. */
@@ -266,6 +265,20 @@ struct virtio_hw {
struct virtio_pci_common_cfg *common_cfg;
struct virtio_net_config *dev_cfg;
const struct virtio_pci_ops *vtpci_ops;
+#ifdef RTE_VIRTIO_VDEV
+#define VHOST_KERNEL 0
+#define VHOST_USER 1
+ int type; /* type of backend */
+ uint32_t queue_num;
+ char *path;
+ int mac_specified;
+ int vhostfd;
+ int backfd; /* tap device used in vhost-net */
+ int callfds[VIRTIO_MAX_VIRTQUEUES * 2 + 1];
+ int kickfds[VIRTIO_MAX_VIRTQUEUES * 2 + 1];
+ uint8_t status;
+ struct rte_eth_dev_data *data;
+#endif
};
/*
--
2.1.4
More information about the dev
mailing list