+++ /dev/null
-/*-
- * BSD LICENSE
- *
- * Copyright(c) 2010-2014 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 <errno.h>
-#include <fuse/cuse_lowlevel.h>
-#include <linux/limits.h>
-#include <linux/vhost.h>
-#include <stdint.h>
-#include <string.h>
-#include <unistd.h>
-
-#include <rte_ethdev.h>
-#include <rte_log.h>
-#include <rte_string_fns.h>
-#include <rte_virtio_net.h>
-
-#include "virtio-net-cdev.h"
-#include "vhost-net.h"
-#include "eventfd_copy.h"
-
-#define FUSE_OPT_DUMMY "\0\0"
-#define FUSE_OPT_FORE "-f\0\0"
-#define FUSE_OPT_NOMULTI "-s\0\0"
-
-static const uint32_t default_major = 231;
-static const uint32_t default_minor = 1;
-static const char cuse_device_name[] = "/dev/cuse";
-static const char default_cdev[] = "vhost-net";
-
-static struct fuse_session *session;
-
-/*
- * Returns vhost_cuse_device_ctx from given fuse_req_t. The
- * index is populated later when the device is added to the
- * device linked list.
- */
-static struct vhost_cuse_device_ctx
-fuse_req_to_vhost_ctx(fuse_req_t req, struct fuse_file_info *fi)
-{
- struct vhost_cuse_device_ctx ctx;
- struct fuse_ctx const *const req_ctx = fuse_req_ctx(req);
-
- ctx.pid = req_ctx->pid;
- ctx.vid = (int)fi->fh;
-
- return ctx;
-}
-
-/*
- * When the device is created in QEMU it gets initialised here and
- * added to the device linked list.
- */
-static void
-vhost_net_open(fuse_req_t req, struct fuse_file_info *fi)
-{
- int vid = 0;
-
- vid = vhost_new_device();
- if (vid == -1) {
- fuse_reply_err(req, EPERM);
- return;
- }
-
- fi->fh = vid;
-
- RTE_LOG(INFO, VHOST_CONFIG,
- "(%d) device configuration started\n", vid);
- fuse_reply_open(req, fi);
-}
-
-/*
- * When QEMU is shutdown or killed the device gets released.
- */
-static void
-vhost_net_release(fuse_req_t req, struct fuse_file_info *fi)
-{
- int err = 0;
- struct vhost_cuse_device_ctx ctx = fuse_req_to_vhost_ctx(req, fi);
-
- vhost_destroy_device(ctx.vid);
- RTE_LOG(INFO, VHOST_CONFIG, "(%d) device released\n", ctx.vid);
- fuse_reply_err(req, err);
-}
-
-/*
- * Boilerplate code for CUSE IOCTL
- * Implicit arguments: vid, req, result.
- */
-#define VHOST_IOCTL(func) do { \
- result = (func)(vid); \
- fuse_reply_ioctl(req, result, NULL, 0); \
-} while (0)
-
-/*
- * Boilerplate IOCTL RETRY
- * Implicit arguments: req.
- */
-#define VHOST_IOCTL_RETRY(size_r, size_w) do { \
- struct iovec iov_r = { arg, (size_r) }; \
- struct iovec iov_w = { arg, (size_w) }; \
- fuse_reply_ioctl_retry(req, &iov_r, \
- (size_r) ? 1 : 0, &iov_w, (size_w) ? 1 : 0);\
-} while (0)
-
-/*
- * Boilerplate code for CUSE Read IOCTL
- * Implicit arguments: vid, req, result, in_bufsz, in_buf.
- */
-#define VHOST_IOCTL_R(type, var, func) do { \
- if (!in_bufsz) { \
- VHOST_IOCTL_RETRY(sizeof(type), 0);\
- } else { \
- (var) = *(const type*)in_buf; \
- result = func(vid, &(var)); \
- fuse_reply_ioctl(req, result, NULL, 0);\
- } \
-} while (0)
-
-/*
- * Boilerplate code for CUSE Write IOCTL
- * Implicit arguments: vid, req, result, out_bufsz.
- */
-#define VHOST_IOCTL_W(type, var, func) do { \
- if (!out_bufsz) { \
- VHOST_IOCTL_RETRY(0, sizeof(type));\
- } else { \
- result = (func)(vid, &(var));\
- fuse_reply_ioctl(req, result, &(var), sizeof(type));\
- } \
-} while (0)
-
-/*
- * Boilerplate code for CUSE Read/Write IOCTL
- * Implicit arguments: vid, req, result, in_bufsz, in_buf.
- */
-#define VHOST_IOCTL_RW(type1, var1, type2, var2, func) do { \
- if (!in_bufsz) { \
- VHOST_IOCTL_RETRY(sizeof(type1), sizeof(type2));\
- } else { \
- (var1) = *(const type1*) (in_buf); \
- result = (func)(vid, (var1), &(var2)); \
- fuse_reply_ioctl(req, result, &(var2), sizeof(type2));\
- } \
-} while (0)
-
-/*
- * The IOCTLs are handled using CUSE/FUSE in userspace. Depending on the type
- * of IOCTL a buffer is requested to read or to write. This request is handled
- * by FUSE and the buffer is then given to CUSE.
- */
-static void
-vhost_net_ioctl(fuse_req_t req, int cmd, void *arg,
- struct fuse_file_info *fi, __rte_unused unsigned flags,
- const void *in_buf, size_t in_bufsz, size_t out_bufsz)
-{
- struct vhost_cuse_device_ctx ctx = fuse_req_to_vhost_ctx(req, fi);
- struct vhost_vring_file file;
- struct vhost_vring_state state;
- struct vhost_vring_addr addr;
- uint64_t features;
- uint32_t index;
- int result = 0;
- int vid = ctx.vid;
-
- switch (cmd) {
- case VHOST_NET_SET_BACKEND:
- LOG_DEBUG(VHOST_CONFIG,
- "(%d) IOCTL: VHOST_NET_SET_BACKEND\n", ctx.vid);
- if (!in_buf) {
- VHOST_IOCTL_RETRY(sizeof(file), 0);
- break;
- }
- file = *(const struct vhost_vring_file *)in_buf;
- result = cuse_set_backend(ctx, &file);
- fuse_reply_ioctl(req, result, NULL, 0);
- break;
-
- case VHOST_GET_FEATURES:
- LOG_DEBUG(VHOST_CONFIG,
- "(%d) IOCTL: VHOST_GET_FEATURES\n", vid);
- VHOST_IOCTL_W(uint64_t, features, vhost_get_features);
- break;
-
- case VHOST_SET_FEATURES:
- LOG_DEBUG(VHOST_CONFIG,
- "(%d) IOCTL: VHOST_SET_FEATURES\n", vid);
- VHOST_IOCTL_R(uint64_t, features, vhost_set_features);
- break;
-
- case VHOST_RESET_OWNER:
- LOG_DEBUG(VHOST_CONFIG,
- "(%d) IOCTL: VHOST_RESET_OWNER\n", vid);
- VHOST_IOCTL(vhost_reset_owner);
- break;
-
- case VHOST_SET_OWNER:
- LOG_DEBUG(VHOST_CONFIG,
- "(%d) IOCTL: VHOST_SET_OWNER\n", vid);
- VHOST_IOCTL(vhost_set_owner);
- break;
-
- case VHOST_SET_MEM_TABLE:
- /*TODO fix race condition.*/
- LOG_DEBUG(VHOST_CONFIG,
- "(%d) IOCTL: VHOST_SET_MEM_TABLE\n", vid);
- static struct vhost_memory mem_temp;
-
- switch (in_bufsz) {
- case 0:
- VHOST_IOCTL_RETRY(sizeof(struct vhost_memory), 0);
- break;
-
- case sizeof(struct vhost_memory):
- mem_temp = *(const struct vhost_memory *) in_buf;
-
- if (mem_temp.nregions > 0) {
- VHOST_IOCTL_RETRY(sizeof(struct vhost_memory) +
- (sizeof(struct vhost_memory_region) *
- mem_temp.nregions), 0);
- } else {
- result = -1;
- fuse_reply_ioctl(req, result, NULL, 0);
- }
- break;
-
- default:
- result = cuse_set_mem_table(ctx, in_buf,
- mem_temp.nregions);
- if (result)
- fuse_reply_err(req, EINVAL);
- else
- fuse_reply_ioctl(req, result, NULL, 0);
- }
- break;
-
- case VHOST_SET_VRING_NUM:
- LOG_DEBUG(VHOST_CONFIG,
- "(%d) IOCTL: VHOST_SET_VRING_NUM\n", vid);
- VHOST_IOCTL_R(struct vhost_vring_state, state,
- vhost_set_vring_num);
- break;
-
- case VHOST_SET_VRING_BASE:
- LOG_DEBUG(VHOST_CONFIG,
- "(%d) IOCTL: VHOST_SET_VRING_BASE\n", vid);
- VHOST_IOCTL_R(struct vhost_vring_state, state,
- vhost_set_vring_base);
- break;
-
- case VHOST_GET_VRING_BASE:
- LOG_DEBUG(VHOST_CONFIG,
- "(%d) IOCTL: VHOST_GET_VRING_BASE\n", vid);
- VHOST_IOCTL_RW(uint32_t, index,
- struct vhost_vring_state, state, vhost_get_vring_base);
- break;
-
- case VHOST_SET_VRING_ADDR:
- LOG_DEBUG(VHOST_CONFIG,
- "(%d) IOCTL: VHOST_SET_VRING_ADDR\n", vid);
- VHOST_IOCTL_R(struct vhost_vring_addr, addr,
- vhost_set_vring_addr);
- break;
-
- case VHOST_SET_VRING_KICK:
- case VHOST_SET_VRING_CALL:
- if (cmd == VHOST_SET_VRING_KICK)
- LOG_DEBUG(VHOST_CONFIG,
- "(%d) IOCTL: VHOST_SET_VRING_KICK\n", vid);
- else
- LOG_DEBUG(VHOST_CONFIG,
- "(%d) IOCTL: VHOST_SET_VRING_CALL\n", vid);
- if (!in_buf)
- VHOST_IOCTL_RETRY(sizeof(struct vhost_vring_file), 0);
- else {
- int fd;
- file = *(const struct vhost_vring_file *)in_buf;
- LOG_DEBUG(VHOST_CONFIG,
- "idx:%d fd:%d\n", file.index, file.fd);
- fd = eventfd_copy(file.fd, ctx.pid);
- if (fd < 0) {
- fuse_reply_ioctl(req, -1, NULL, 0);
- result = -1;
- break;
- }
- file.fd = fd;
- if (cmd == VHOST_SET_VRING_KICK) {
- result = vhost_set_vring_kick(vid, &file);
- fuse_reply_ioctl(req, result, NULL, 0);
- } else {
- result = vhost_set_vring_call(vid, &file);
- fuse_reply_ioctl(req, result, NULL, 0);
- }
- }
- break;
-
- default:
- RTE_LOG(ERR, VHOST_CONFIG,
- "(%d) IOCTL: DOESN NOT EXIST\n", vid);
- result = -1;
- fuse_reply_ioctl(req, result, NULL, 0);
- }
-
- if (result < 0)
- LOG_DEBUG(VHOST_CONFIG,
- "(%d) IOCTL: FAIL\n", vid);
- else
- LOG_DEBUG(VHOST_CONFIG,
- "(%d) IOCTL: SUCCESS\n", vid);
-}
-
-/*
- * Structure handling open, release and ioctl function pointers is populated.
- */
-static const struct cuse_lowlevel_ops vhost_net_ops = {
- .open = vhost_net_open,
- .release = vhost_net_release,
- .ioctl = vhost_net_ioctl,
-};
-
-/*
- * cuse_info is populated and used to register the cuse device.
- * vhost_net_device_ops are also passed when the device is registered in app.
- */
-int
-rte_vhost_driver_register(const char *dev_name, uint64_t flags)
-{
- struct cuse_info cuse_info;
- char device_name[PATH_MAX] = "";
- char char_device_name[PATH_MAX] = "";
- const char *device_argv[] = { device_name };
-
- char fuse_opt_dummy[] = FUSE_OPT_DUMMY;
- char fuse_opt_fore[] = FUSE_OPT_FORE;
- char fuse_opt_nomulti[] = FUSE_OPT_NOMULTI;
- char *fuse_argv[] = {fuse_opt_dummy, fuse_opt_fore, fuse_opt_nomulti};
-
- if (flags) {
- RTE_LOG(ERR, VHOST_CONFIG,
- "vhost-cuse does not support any flags so far\n");
- return -1;
- }
-
- if (access(cuse_device_name, R_OK | W_OK) < 0) {
- RTE_LOG(ERR, VHOST_CONFIG,
- "char device %s can't be accessed, maybe not exist\n",
- cuse_device_name);
- return -1;
- }
-
- if (eventfd_init() < 0)
- return -1;
-
- /*
- * The device name is created. This is passed to QEMU so that it can
- * register the device with our application.
- */
- snprintf(device_name, PATH_MAX, "DEVNAME=%s", dev_name);
- snprintf(char_device_name, PATH_MAX, "/dev/%s", dev_name);
-
- /* Check if device already exists. */
- if (access(char_device_name, F_OK) != -1) {
- RTE_LOG(ERR, VHOST_CONFIG,
- "char device %s already exists\n", char_device_name);
- return -1;
- }
-
- memset(&cuse_info, 0, sizeof(cuse_info));
- cuse_info.dev_major = default_major;
- cuse_info.dev_minor = default_minor;
- cuse_info.dev_info_argc = 1;
- cuse_info.dev_info_argv = device_argv;
- cuse_info.flags = CUSE_UNRESTRICTED_IOCTL;
-
- session = cuse_lowlevel_setup(3, fuse_argv,
- &cuse_info, &vhost_net_ops, 0, NULL);
- if (session == NULL)
- return -1;
-
- return 0;
-}
-
-/**
- * An empty function for unregister
- */
-int
-rte_vhost_driver_unregister(const char *dev_name __rte_unused)
-{
- return 0;
-}
-
-/**
- * The CUSE session is launched allowing the application to receive open,
- * release and ioctl calls.
- */
-int
-rte_vhost_driver_session_start(void)
-{
- fuse_session_loop(session);
-
- return 0;
-}
Code Review / deb_dpdk.git / blobdiff