1 files changed, 435 insertions, 0 deletions

diff --git a/lib/librte_vhost/vhost_cuse/virtio-net-cdev.c b/lib/librte_vhost/vhost_cuse/virtio-net-cdev.c
new file mode 100644
index 00000000..a68a8bd4
--- /dev/null
+++ b/lib/librte_vhost/vhost_cuse/virtio-net-cdev.c
@@ -0,0 +1,435 @@
+/*-
+ *   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 <stdint.h>
+#include <dirent.h>
+#include <linux/vhost.h>
+#include <linux/virtio_net.h>
+#include <fuse/cuse_lowlevel.h>
+#include <stddef.h>
+#include <string.h>
+#include <stdlib.h>
+#include <sys/eventfd.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <linux/if_tun.h>
+#include <linux/if.h>
+#include <errno.h>
+
+#include <rte_log.h>
+
+#include "rte_virtio_net.h"
+#include "vhost-net.h"
+#include "virtio-net-cdev.h"
+#include "virtio-net.h"
+#include "eventfd_copy.h"
+
+/* Line size for reading maps file. */
+static const uint32_t BUFSIZE = PATH_MAX;
+
+/* Size of prot char array in procmap. */
+#define PROT_SZ 5
+
+/* Number of elements in procmap struct. */
+#define PROCMAP_SZ 8
+
+/* Structure containing information gathered from maps file. */
+struct procmap {
+	uint64_t va_start;	/* Start virtual address in file. */
+	uint64_t len;		/* Size of file. */
+	uint64_t pgoff;		/* Not used. */
+	uint32_t maj;		/* Not used. */
+	uint32_t min;		/* Not used. */
+	uint32_t ino;		/* Not used. */
+	char prot[PROT_SZ];	/* Not used. */
+	char fname[PATH_MAX];	/* File name. */
+};
+
+/*
+ * Locate the file containing QEMU's memory space and
+ * map it to our address space.
+ */
+static int
+host_memory_map(pid_t pid, uint64_t addr,
+	uint64_t *mapped_address, uint64_t *mapped_size)
+{
+	struct dirent *dptr = NULL;
+	struct procmap procmap;
+	DIR *dp = NULL;
+	int fd;
+	int i;
+	char memfile[PATH_MAX];
+	char mapfile[PATH_MAX];
+	char procdir[PATH_MAX];
+	char resolved_path[PATH_MAX];
+	char *path = NULL;
+	FILE *fmap;
+	void *map;
+	uint8_t found = 0;
+	char line[BUFSIZE];
+	char dlm[] = "-   :   ";
+	char *str, *sp, *in[PROCMAP_SZ];
+	char *end = NULL;
+
+	/* Path where mem files are located. */
+	snprintf(procdir, PATH_MAX, "/proc/%u/fd/", pid);
+	/* Maps file used to locate mem file. */
+	snprintf(mapfile, PATH_MAX, "/proc/%u/maps", pid);
+
+	fmap = fopen(mapfile, "r");
+	if (fmap == NULL) {
+		RTE_LOG(ERR, VHOST_CONFIG,
+			"Failed to open maps file for pid %d\n",
+			pid);
+		return -1;
+	}
+
+	/* Read through maps file until we find out base_address. */
+	while (fgets(line, BUFSIZE, fmap) != 0) {
+		str = line;
+		errno = 0;
+		/* Split line into fields. */
+		for (i = 0; i < PROCMAP_SZ; i++) {
+			in[i] = strtok_r(str, &dlm[i], &sp);
+			if ((in[i] == NULL) || (errno != 0)) {
+				fclose(fmap);
+				return -1;
+			}
+			str = NULL;
+		}
+
+		/* Convert/Copy each field as needed. */
+		procmap.va_start = strtoull(in[0], &end, 16);
+		if ((in[0] == '\0') || (end == NULL) || (*end != '\0') ||
+			(errno != 0)) {
+			fclose(fmap);
+			return -1;
+		}
+
+		procmap.len = strtoull(in[1], &end, 16);
+		if ((in[1] == '\0') || (end == NULL) || (*end != '\0') ||
+			(errno != 0)) {
+			fclose(fmap);
+			return -1;
+		}
+
+		procmap.pgoff = strtoull(in[3], &end, 16);
+		if ((in[3] == '\0') || (end == NULL) || (*end != '\0') ||
+			(errno != 0)) {
+			fclose(fmap);
+			return -1;
+		}
+
+		procmap.maj = strtoul(in[4], &end, 16);
+		if ((in[4] == '\0') || (end == NULL) || (*end != '\0') ||
+			(errno != 0)) {
+			fclose(fmap);
+			return -1;
+		}
+
+		procmap.min = strtoul(in[5], &end, 16);
+		if ((in[5] == '\0') || (end == NULL) || (*end != '\0') ||
+			(errno != 0)) {
+			fclose(fmap);
+			return -1;
+		}
+
+		procmap.ino = strtoul(in[6], &end, 16);
+		if ((in[6] == '\0') || (end == NULL) || (*end != '\0') ||
+			(errno != 0)) {
+			fclose(fmap);
+			return -1;
+		}
+
+		memcpy(&procmap.prot, in[2], PROT_SZ);
+		memcpy(&procmap.fname, in[7], PATH_MAX);
+
+		if (procmap.va_start == addr) {
+			procmap.len = procmap.len - procmap.va_start;
+			found = 1;
+			break;
+		}
+	}
+	fclose(fmap);
+
+	if (!found) {
+		RTE_LOG(ERR, VHOST_CONFIG,
+			"Failed to find memory file in pid %d maps file\n",
+			pid);
+		return -1;
+	}
+
+	/* Find the guest memory file among the process fds. */
+	dp = opendir(procdir);
+	if (dp == NULL) {
+		RTE_LOG(ERR, VHOST_CONFIG,
+			"Cannot open pid %d process directory\n",
+			pid);
+		return -1;
+	}
+
+	found = 0;
+
+	/* Read the fd directory contents. */
+	while (NULL != (dptr = readdir(dp))) {
+		snprintf(memfile, PATH_MAX, "/proc/%u/fd/%s",
+				pid, dptr->d_name);
+		path = realpath(memfile, resolved_path);
+		if ((path == NULL) && (strlen(resolved_path) == 0)) {
+			RTE_LOG(ERR, VHOST_CONFIG,
+				"Failed to resolve fd directory\n");
+			closedir(dp);
+			return -1;
+		}
+		if (strncmp(resolved_path, procmap.fname,
+			strnlen(procmap.fname, PATH_MAX)) == 0) {
+			found = 1;
+			break;
+		}
+	}
+
+	closedir(dp);
+
+	if (found == 0) {
+		RTE_LOG(ERR, VHOST_CONFIG,
+			"Failed to find memory file for pid %d\n",
+			pid);
+		return -1;
+	}
+	/* Open the shared memory file and map the memory into this process. */
+	fd = open(memfile, O_RDWR);
+
+	if (fd == -1) {
+		RTE_LOG(ERR, VHOST_CONFIG,
+			"Failed to open %s for pid %d\n",
+			memfile, pid);
+		return -1;
+	}
+
+	map = mmap(0, (size_t)procmap.len, PROT_READ|PROT_WRITE,
+			MAP_POPULATE|MAP_SHARED, fd, 0);
+	close(fd);
+
+	if (map == MAP_FAILED) {
+		RTE_LOG(ERR, VHOST_CONFIG,
+			"Error mapping the file %s for pid %d\n",
+			memfile, pid);
+		return -1;
+	}
+
+	/* Store the memory address and size in the device data structure */
+	*mapped_address = (uint64_t)(uintptr_t)map;
+	*mapped_size = procmap.len;
+
+	LOG_DEBUG(VHOST_CONFIG,
+		"Mem File: %s->%s - Size: %llu - VA: %p\n",
+		memfile, resolved_path,
+		(unsigned long long)*mapped_size, map);
+
+	return 0;
+}
+
+int
+cuse_set_mem_table(struct vhost_device_ctx ctx,
+	const struct vhost_memory *mem_regions_addr, uint32_t nregions)
+{
+	uint64_t size = offsetof(struct vhost_memory, regions);
+	uint32_t idx, valid_regions;
+	struct virtio_memory_regions *pregion;
+	struct vhost_memory_region *mem_regions = (void *)(uintptr_t)
+		((uint64_t)(uintptr_t)mem_regions_addr + size);
+	uint64_t base_address = 0, mapped_address, mapped_size;
+	struct virtio_net *dev;
+
+	dev = get_device(ctx);
+	if (dev == NULL)
+		return -1;
+
+	if (dev->mem && dev->mem->mapped_address) {
+		munmap((void *)(uintptr_t)dev->mem->mapped_address,
+			(size_t)dev->mem->mapped_size);
+		free(dev->mem);
+		dev->mem = NULL;
+	}
+
+	dev->mem = calloc(1, sizeof(struct virtio_memory) +
+		sizeof(struct virtio_memory_regions) * nregions);
+	if (dev->mem == NULL) {
+		RTE_LOG(ERR, VHOST_CONFIG,
+			"(%"PRIu64") Failed to allocate memory for dev->mem\n",
+			dev->device_fh);
+		return -1;
+	}
+
+	pregion = &dev->mem->regions[0];
+
+	for (idx = 0; idx < nregions; idx++) {
+		pregion[idx].guest_phys_address =
+			mem_regions[idx].guest_phys_addr;
+		pregion[idx].guest_phys_address_end =
+			pregion[idx].guest_phys_address +
+			mem_regions[idx].memory_size;
+		pregion[idx].memory_size =
+			mem_regions[idx].memory_size;
+		pregion[idx].userspace_address =
+			mem_regions[idx].userspace_addr;
+
+		LOG_DEBUG(VHOST_CONFIG,
+			"REGION: %u - GPA: %p - QVA: %p - SIZE (%"PRIu64")\n",
+			idx,
+			(void *)(uintptr_t)pregion[idx].guest_phys_address,
+			(void *)(uintptr_t)pregion[idx].userspace_address,
+			pregion[idx].memory_size);
+
+		/*set the base address mapping*/
+		if (pregion[idx].guest_phys_address == 0x0) {
+			base_address =
+				pregion[idx].userspace_address;
+			/* Map VM memory file */
+			if (host_memory_map(ctx.pid, base_address,
+				&mapped_address, &mapped_size) != 0) {
+				free(dev->mem);
+				dev->mem = NULL;
+				return -1;
+			}
+			dev->mem->mapped_address = mapped_address;
+			dev->mem->base_address = base_address;
+			dev->mem->mapped_size = mapped_size;
+		}
+	}
+
+	/* Check that we have a valid base address. */
+	if (base_address == 0) {
+		RTE_LOG(ERR, VHOST_CONFIG,
+			"Failed to find base address of qemu memory file.\n");
+		free(dev->mem);
+		dev->mem = NULL;
+		return -1;
+	}
+
+	valid_regions = nregions;
+	for (idx = 0; idx < nregions; idx++) {
+		if ((pregion[idx].userspace_address < base_address) ||
+			(pregion[idx].userspace_address >
+			(base_address + mapped_size)))
+			valid_regions--;
+	}
+
+
+	if (valid_regions != nregions) {
+		valid_regions = 0;
+		for (idx = nregions; 0 != idx--; ) {
+			if ((pregion[idx].userspace_address < base_address) ||
+			(pregion[idx].userspace_address >
+			(base_address + mapped_size))) {
+				memmove(&pregion[idx], &pregion[idx + 1],
+					sizeof(struct virtio_memory_regions) *
+					valid_regions);
+			} else
+				valid_regions++;
+		}
+	}
+
+	for (idx = 0; idx < valid_regions; idx++) {
+		pregion[idx].address_offset =
+			mapped_address - base_address +
+			pregion[idx].userspace_address -
+			pregion[idx].guest_phys_address;
+	}
+	dev->mem->nregions = valid_regions;
+
+	return 0;
+}
+
+/*
+ * Function to get the tap device name from the provided file descriptor and
+ * save it in the device structure.
+ */
+static int
+get_ifname(struct vhost_device_ctx ctx, struct virtio_net *dev, int tap_fd, int pid)
+{
+	int fd_tap;
+	struct ifreq ifr;
+	uint32_t ifr_size;
+	int ret;
+
+	fd_tap = eventfd_copy(tap_fd, pid);
+	if (fd_tap < 0)
+		return -1;
+
+	ret = ioctl(fd_tap, TUNGETIFF, &ifr);
+
+	if (close(fd_tap) < 0)
+		RTE_LOG(ERR, VHOST_CONFIG,
+			"(%"PRIu64") fd close failed\n",
+			dev->device_fh);
+
+	if (ret >= 0) {
+		ifr_size = strnlen(ifr.ifr_name, sizeof(ifr.ifr_name));
+		vhost_set_ifname(ctx, ifr.ifr_name, ifr_size);
+	} else
+		RTE_LOG(ERR, VHOST_CONFIG,
+			"(%"PRIu64") TUNGETIFF ioctl failed\n",
+			dev->device_fh);
+
+	return 0;
+}
+
+int cuse_set_backend(struct vhost_device_ctx ctx, struct vhost_vring_file *file)
+{
+	struct virtio_net *dev;
+
+	dev = get_device(ctx);
+	if (dev == NULL)
+		return -1;
+
+	if (!(dev->flags & VIRTIO_DEV_RUNNING) && file->fd != VIRTIO_DEV_STOPPED)
+		get_ifname(ctx, dev, file->fd, ctx.pid);
+
+	return vhost_set_backend(ctx, file);
+}
+
+void
+vhost_backend_cleanup(struct virtio_net *dev)
+{
+	/* Unmap QEMU memory file if mapped. */
+	if (dev->mem) {
+		munmap((void *)(uintptr_t)dev->mem->mapped_address,
+			(size_t)dev->mem->mapped_size);
+		free(dev->mem);
+		dev->mem = NULL;
+	}
+}