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authorChristian Ehrhardt <christian.ehrhardt@canonical.com>2016-07-06 09:22:35 +0200
committerChristian Ehrhardt <christian.ehrhardt@canonical.com>2016-07-06 16:09:40 +0200
commit8b25d1ad5d2264bdfc2818c7bda74ee2697df6db (patch)
tree8c3c769777f7e66a2d1ba7dd7651b563cfde370b /drivers/net/virtio/virtio_user/vhost_user.c
parent97f17497d162afdb82c8704bf097f0fee3724b2e (diff)
Imported Upstream version 16.07-rc1
Change-Id: I40a523e52f12e8496fdd69e902824b0226c303de Signed-off-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
Diffstat (limited to 'drivers/net/virtio/virtio_user/vhost_user.c')
-rw-r--r--drivers/net/virtio/virtio_user/vhost_user.c426
1 files changed, 426 insertions, 0 deletions
diff --git a/drivers/net/virtio/virtio_user/vhost_user.c b/drivers/net/virtio/virtio_user/vhost_user.c
new file mode 100644
index 00000000..a2b0687f
--- /dev/null
+++ b/drivers/net/virtio/virtio_user/vhost_user.c
@@ -0,0 +1,426 @@
+/*-
+ * 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 <sys/socket.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/un.h>
+#include <string.h>
+#include <errno.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;
+
+ memset(&msgh, 0, sizeof(msgh));
+ memset(control, 0, 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;
+}
+
+struct hugepage_file_info {
+ uint64_t addr; /**< virtual addr */
+ size_t size; /**< the file size */
+ char path[PATH_MAX]; /**< path to backing file */
+};
+
+/* Two possible options:
+ * 1. Match HUGEPAGE_INFO_FMT to find the file storing struct hugepage_file
+ * array. This is simple but cannot be used in secondary process because
+ * secondary process will close and munmap that file.
+ * 2. Match HUGEFILE_FMT to find hugepage files directly.
+ *
+ * We choose option 2.
+ */
+static int
+get_hugepage_file_info(struct hugepage_file_info huges[], int max)
+{
+ int idx;
+ FILE *f;
+ char buf[BUFSIZ], *tmp, *tail;
+ char *str_underline, *str_start;
+ int huge_index;
+ uint64_t v_start, v_end;
+
+ f = fopen("/proc/self/maps", "r");
+ if (!f) {
+ PMD_DRV_LOG(ERR, "cannot open /proc/self/maps");
+ return -1;
+ }
+
+ idx = 0;
+ while (fgets(buf, sizeof(buf), f) != NULL) {
+ if (sscanf(buf, "%" PRIx64 "-%" PRIx64, &v_start, &v_end) < 2) {
+ PMD_DRV_LOG(ERR, "Failed to parse address");
+ goto error;
+ }
+
+ tmp = strchr(buf, ' ') + 1; /** skip address */
+ tmp = strchr(tmp, ' ') + 1; /** skip perm */
+ tmp = strchr(tmp, ' ') + 1; /** skip offset */
+ tmp = strchr(tmp, ' ') + 1; /** skip dev */
+ tmp = strchr(tmp, ' ') + 1; /** skip inode */
+ while (*tmp == ' ') /** skip spaces */
+ tmp++;
+ tail = strrchr(tmp, '\n'); /** remove newline if exists */
+ if (tail)
+ *tail = '\0';
+
+ /* Match HUGEFILE_FMT, aka "%s/%smap_%d",
+ * which is defined in eal_filesystem.h
+ */
+ str_underline = strrchr(tmp, '_');
+ if (!str_underline)
+ continue;
+
+ str_start = str_underline - strlen("map");
+ if (str_start < tmp)
+ continue;
+
+ if (sscanf(str_start, "map_%d", &huge_index) != 1)
+ continue;
+
+ if (idx >= max) {
+ PMD_DRV_LOG(ERR, "Exceed maximum of %d", max);
+ goto error;
+ }
+ huges[idx].addr = v_start;
+ huges[idx].size = v_end - v_start;
+ strcpy(huges[idx].path, tmp);
+ idx++;
+ }
+
+ fclose(f);
+ return idx;
+
+error:
+ fclose(f);
+ return -1;
+}
+
+static int
+prepare_vhost_memory_user(struct vhost_user_msg *msg, int fds[])
+{
+ int i, num;
+ struct hugepage_file_info huges[VHOST_MEMORY_MAX_NREGIONS];
+ struct vhost_memory_region *mr;
+
+ num = get_hugepage_file_info(huges, VHOST_MEMORY_MAX_NREGIONS);
+ if (num < 0) {
+ PMD_INIT_LOG(ERR, "Failed to prepare memory for vhost-user");
+ return -1;
+ }
+
+ for (i = 0; i < num; ++i) {
+ mr = &msg->payload.memory.regions[i];
+ mr->guest_phys_addr = huges[i].addr; /* use vaddr! */
+ mr->userspace_addr = huges[i].addr;
+ mr->memory_size = huges[i].size;
+ mr->mmap_offset = 0;
+ fds[i] = open(huges[i].path, O_RDWR);
+ }
+
+ msg->payload.memory.nregions = num;
+ msg->payload.memory.padding = 0;
+
+ return 0;
+}
+
+static struct vhost_user_msg m;
+
+static const char * const vhost_msg_strings[] = {
+ [VHOST_USER_SET_OWNER] = "VHOST_USER_SET_OWNER",
+ [VHOST_USER_RESET_OWNER] = "VHOST_USER_RESET_OWNER",
+ [VHOST_USER_SET_FEATURES] = "VHOST_USER_SET_FEATURES",
+ [VHOST_USER_GET_FEATURES] = "VHOST_USER_GET_FEATURES",
+ [VHOST_USER_SET_VRING_CALL] = "VHOST_USER_SET_VRING_CALL",
+ [VHOST_USER_SET_VRING_NUM] = "VHOST_USER_SET_VRING_NUM",
+ [VHOST_USER_SET_VRING_BASE] = "VHOST_USER_SET_VRING_BASE",
+ [VHOST_USER_GET_VRING_BASE] = "VHOST_USER_GET_VRING_BASE",
+ [VHOST_USER_SET_VRING_ADDR] = "VHOST_USER_SET_VRING_ADDR",
+ [VHOST_USER_SET_VRING_KICK] = "VHOST_USER_SET_VRING_KICK",
+ [VHOST_USER_SET_MEM_TABLE] = "VHOST_USER_SET_MEM_TABLE",
+ [VHOST_USER_SET_VRING_ENABLE] = "VHOST_USER_SET_VRING_ENABLE",
+ NULL,
+};
+
+int
+vhost_user_sock(int vhostfd, enum vhost_user_request 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;
+
+ RTE_SET_USED(m);
+ RTE_SET_USED(vhost_msg_strings);
+
+ PMD_DRV_LOG(INFO, "%s", vhost_msg_strings[req]);
+
+ 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:
+ if (prepare_vhost_memory_user(&msg, fds) < 0)
+ return -1;
+ 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:
+ case VHOST_USER_SET_VRING_ENABLE:
+ 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, "trying to send unhandled msg type");
+ return -1;
+ }
+
+ len = VHOST_USER_HDR_SIZE + msg.size;
+ if (vhost_user_write(vhostfd, &msg, len, fds, fd_num) < 0) {
+ PMD_DRV_LOG(ERR, "%s failed: %s",
+ vhost_msg_strings[req], strerror(errno));
+ return -1;
+ }
+
+ if (req == VHOST_USER_SET_MEM_TABLE)
+ for (i = 0; i < fd_num; ++i)
+ close(fds[i]);
+
+ if (need_reply) {
+ if (vhost_user_read(vhostfd, &msg) < 0) {
+ PMD_DRV_LOG(ERR, "Received msg failed: %s",
+ strerror(errno));
+ 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;
+}
+
+/**
+ * Set up environment to talk with a vhost user backend.
+ * @param path
+ * - The path to vhost user unix socket file.
+ *
+ * @return
+ * - (-1) if fail to set up;
+ * - (>=0) if successful, and it is the fd to vhostfd.
+ */
+int
+vhost_user_setup(const char *path)
+{
+ int fd;
+ int flag;
+ struct sockaddr_un un;
+
+ fd = socket(AF_UNIX, SOCK_STREAM, 0);
+ if (fd < 0) {
+ PMD_DRV_LOG(ERR, "socket() error, %s", strerror(errno));
+ return -1;
+ }
+
+ 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", path);
+ if (connect(fd, (struct sockaddr *)&un, sizeof(un)) < 0) {
+ PMD_DRV_LOG(ERR, "connect error, %s", strerror(errno));
+ close(fd);
+ return -1;
+ }
+
+ return fd;
+}
+
+int
+vhost_user_enable_queue_pair(int vhostfd, uint16_t pair_idx, int enable)
+{
+ int i;
+
+ for (i = 0; i < 2; ++i) {
+ struct vhost_vring_state state = {
+ .index = pair_idx * 2 + i,
+ .num = enable,
+ };
+
+ if (vhost_user_sock(vhostfd,
+ VHOST_USER_SET_VRING_ENABLE, &state))
+ return -1;
+ }
+
+ return 0;
+}