diff options
Diffstat (limited to 'src/seastar/dpdk/lib/librte_vhost')
| -rw-r--r-- | src/seastar/dpdk/lib/librte_vhost/Makefile | 56 | ||||
| -rw-r--r-- | src/seastar/dpdk/lib/librte_vhost/fd_man.c | 300 | ||||
| -rw-r--r-- | src/seastar/dpdk/lib/librte_vhost/fd_man.h | 69 | ||||
| -rw-r--r-- | src/seastar/dpdk/lib/librte_vhost/rte_vhost.h | 439 | ||||
| -rw-r--r-- | src/seastar/dpdk/lib/librte_vhost/rte_vhost_version.map | 47 | ||||
| -rw-r--r-- | src/seastar/dpdk/lib/librte_vhost/socket.c | 798 | ||||
| -rw-r--r-- | src/seastar/dpdk/lib/librte_vhost/vhost.c | 477 | ||||
| -rw-r--r-- | src/seastar/dpdk/lib/librte_vhost/vhost.h | 315 | ||||
| -rw-r--r-- | src/seastar/dpdk/lib/librte_vhost/vhost_user.c | 1109 | ||||
| -rw-r--r-- | src/seastar/dpdk/lib/librte_vhost/vhost_user.h | 138 | ||||
| -rw-r--r-- | src/seastar/dpdk/lib/librte_vhost/virtio_net.c | 1171 |
11 files changed, 4919 insertions, 0 deletions
diff --git a/src/seastar/dpdk/lib/librte_vhost/Makefile b/src/seastar/dpdk/lib/librte_vhost/Makefile new file mode 100644 index 00000000..4a116fe3 --- /dev/null +++ b/src/seastar/dpdk/lib/librte_vhost/Makefile @@ -0,0 +1,56 @@ +# 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 $(RTE_SDK)/mk/rte.vars.mk + +# library name +LIB = librte_vhost.a + +EXPORT_MAP := rte_vhost_version.map + +LIBABIVER := 4 + +CFLAGS += $(WERROR_FLAGS) -I$(SRCDIR) -O3 -D_FILE_OFFSET_BITS=64 +CFLAGS += -I vhost_user +LDLIBS += -lpthread + +ifeq ($(CONFIG_RTE_LIBRTE_VHOST_NUMA),y) +LDLIBS += -lnuma +endif + +# all source are stored in SRCS-y +SRCS-$(CONFIG_RTE_LIBRTE_VHOST) := fd_man.c socket.c vhost.c vhost_user.c \ + virtio_net.c + +# install includes +SYMLINK-$(CONFIG_RTE_LIBRTE_VHOST)-include += rte_vhost.h + +include $(RTE_SDK)/mk/rte.lib.mk diff --git a/src/seastar/dpdk/lib/librte_vhost/fd_man.c b/src/seastar/dpdk/lib/librte_vhost/fd_man.c new file mode 100644 index 00000000..2ceacc9a --- /dev/null +++ b/src/seastar/dpdk/lib/librte_vhost/fd_man.c @@ -0,0 +1,300 @@ +/*- + * 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 <stdio.h> +#include <stdlib.h> +#include <sys/socket.h> +#include <sys/time.h> +#include <sys/types.h> +#include <unistd.h> +#include <string.h> + +#include <rte_common.h> +#include <rte_log.h> + +#include "fd_man.h" + +#define FDPOLLERR (POLLERR | POLLHUP | POLLNVAL) + +static int +get_last_valid_idx(struct fdset *pfdset, int last_valid_idx) +{ + int i; + + for (i = last_valid_idx; i >= 0 && pfdset->fd[i].fd == -1; i--) + ; + + return i; +} + +static void +fdset_move(struct fdset *pfdset, int dst, int src) +{ + pfdset->fd[dst] = pfdset->fd[src]; + pfdset->rwfds[dst] = pfdset->rwfds[src]; +} + +static void +fdset_shrink_nolock(struct fdset *pfdset) +{ + int i; + int last_valid_idx = get_last_valid_idx(pfdset, pfdset->num - 1); + + for (i = 0; i < last_valid_idx; i++) { + if (pfdset->fd[i].fd != -1) + continue; + + fdset_move(pfdset, i, last_valid_idx); + last_valid_idx = get_last_valid_idx(pfdset, last_valid_idx - 1); + } + pfdset->num = last_valid_idx + 1; +} + +/* + * Find deleted fd entries and remove them + */ +static void +fdset_shrink(struct fdset *pfdset) +{ + pthread_mutex_lock(&pfdset->fd_mutex); + fdset_shrink_nolock(pfdset); + pthread_mutex_unlock(&pfdset->fd_mutex); +} + +/** + * Returns the index in the fdset for a given fd. + * @return + * index for the fd, or -1 if fd isn't in the fdset. + */ +static int +fdset_find_fd(struct fdset *pfdset, int fd) +{ + int i; + + for (i = 0; i < pfdset->num && pfdset->fd[i].fd != fd; i++) + ; + + return i == pfdset->num ? -1 : i; +} + +static void +fdset_add_fd(struct fdset *pfdset, int idx, int fd, + fd_cb rcb, fd_cb wcb, void *dat) +{ + struct fdentry *pfdentry = &pfdset->fd[idx]; + struct pollfd *pfd = &pfdset->rwfds[idx]; + + pfdentry->fd = fd; + pfdentry->rcb = rcb; + pfdentry->wcb = wcb; + pfdentry->dat = dat; + + pfd->fd = fd; + pfd->events = rcb ? POLLIN : 0; + pfd->events |= wcb ? POLLOUT : 0; + pfd->revents = 0; +} + +void +fdset_init(struct fdset *pfdset) +{ + int i; + + if (pfdset == NULL) + return; + + for (i = 0; i < MAX_FDS; i++) { + pfdset->fd[i].fd = -1; + pfdset->fd[i].dat = NULL; + } + pfdset->num = 0; +} + +/** + * Register the fd in the fdset with read/write handler and context. + */ +int +fdset_add(struct fdset *pfdset, int fd, fd_cb rcb, fd_cb wcb, void *dat) +{ + int i; + + if (pfdset == NULL || fd == -1) + return -1; + + pthread_mutex_lock(&pfdset->fd_mutex); + i = pfdset->num < MAX_FDS ? pfdset->num++ : -1; + if (i == -1) { + fdset_shrink_nolock(pfdset); + i = pfdset->num < MAX_FDS ? pfdset->num++ : -1; + if (i == -1) { + pthread_mutex_unlock(&pfdset->fd_mutex); + return -2; + } + } + + fdset_add_fd(pfdset, i, fd, rcb, wcb, dat); + pthread_mutex_unlock(&pfdset->fd_mutex); + + return 0; +} + +/** + * Unregister the fd from the fdset. + * Returns context of a given fd or NULL. + */ +void * +fdset_del(struct fdset *pfdset, int fd) +{ + int i; + void *dat = NULL; + + if (pfdset == NULL || fd == -1) + return NULL; + + do { + pthread_mutex_lock(&pfdset->fd_mutex); + + i = fdset_find_fd(pfdset, fd); + if (i != -1 && pfdset->fd[i].busy == 0) { + /* busy indicates r/wcb is executing! */ + dat = pfdset->fd[i].dat; + pfdset->fd[i].fd = -1; + pfdset->fd[i].rcb = pfdset->fd[i].wcb = NULL; + pfdset->fd[i].dat = NULL; + i = -1; + } + pthread_mutex_unlock(&pfdset->fd_mutex); + } while (i != -1); + + return dat; +} + + +/** + * This functions runs in infinite blocking loop until there is no fd in + * pfdset. It calls corresponding r/w handler if there is event on the fd. + * + * Before the callback is called, we set the flag to busy status; If other + * thread(now rte_vhost_driver_unregister) calls fdset_del concurrently, it + * will wait until the flag is reset to zero(which indicates the callback is + * finished), then it could free the context after fdset_del. + */ +void * +fdset_event_dispatch(void *arg) +{ + int i; + struct pollfd *pfd; + struct fdentry *pfdentry; + fd_cb rcb, wcb; + void *dat; + int fd, numfds; + int remove1, remove2; + int need_shrink; + struct fdset *pfdset = arg; + + if (pfdset == NULL) + return NULL; + + while (1) { + + /* + * When poll is blocked, other threads might unregister + * listenfds from and register new listenfds into fdset. + * When poll returns, the entries for listenfds in the fdset + * might have been updated. It is ok if there is unwanted call + * for new listenfds. + */ + pthread_mutex_lock(&pfdset->fd_mutex); + numfds = pfdset->num; + pthread_mutex_unlock(&pfdset->fd_mutex); + + poll(pfdset->rwfds, numfds, 1000 /* millisecs */); + + need_shrink = 0; + for (i = 0; i < numfds; i++) { + pthread_mutex_lock(&pfdset->fd_mutex); + + pfdentry = &pfdset->fd[i]; + fd = pfdentry->fd; + pfd = &pfdset->rwfds[i]; + + if (fd < 0) { + need_shrink = 1; + pthread_mutex_unlock(&pfdset->fd_mutex); + continue; + } + + if (!pfd->revents) { + pthread_mutex_unlock(&pfdset->fd_mutex); + continue; + } + + remove1 = remove2 = 0; + + rcb = pfdentry->rcb; + wcb = pfdentry->wcb; + dat = pfdentry->dat; + pfdentry->busy = 1; + + pthread_mutex_unlock(&pfdset->fd_mutex); + + if (rcb && pfd->revents & (POLLIN | FDPOLLERR)) + rcb(fd, dat, &remove1); + if (wcb && pfd->revents & (POLLOUT | FDPOLLERR)) + wcb(fd, dat, &remove2); + pfdentry->busy = 0; + /* + * fdset_del needs to check busy flag. + * We don't allow fdset_del to be called in callback + * directly. + */ + /* + * When we are to clean up the fd from fdset, + * because the fd is closed in the cb, + * the old fd val could be reused by when creates new + * listen fd in another thread, we couldn't call + * fd_set_del. + */ + if (remove1 || remove2) { + pfdentry->fd = -1; + need_shrink = 1; + } + } + + if (need_shrink) + fdset_shrink(pfdset); + } + + return NULL; +} diff --git a/src/seastar/dpdk/lib/librte_vhost/fd_man.h b/src/seastar/dpdk/lib/librte_vhost/fd_man.h new file mode 100644 index 00000000..90d34db1 --- /dev/null +++ b/src/seastar/dpdk/lib/librte_vhost/fd_man.h @@ -0,0 +1,69 @@ +/*- + * 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. + */ + +#ifndef _FD_MAN_H_ +#define _FD_MAN_H_ +#include <stdint.h> +#include <pthread.h> +#include <poll.h> + +#define MAX_FDS 1024 + +typedef void (*fd_cb)(int fd, void *dat, int *remove); + +struct fdentry { + int fd; /* -1 indicates this entry is empty */ + fd_cb rcb; /* callback when this fd is readable. */ + fd_cb wcb; /* callback when this fd is writeable.*/ + void *dat; /* fd context */ + int busy; /* whether this entry is being used in cb. */ +}; + +struct fdset { + struct pollfd rwfds[MAX_FDS]; + struct fdentry fd[MAX_FDS]; + pthread_mutex_t fd_mutex; + int num; /* current fd number of this fdset */ +}; + + +void fdset_init(struct fdset *pfdset); + +int fdset_add(struct fdset *pfdset, int fd, + fd_cb rcb, fd_cb wcb, void *dat); + +void *fdset_del(struct fdset *pfdset, int fd); + +void *fdset_event_dispatch(void *arg); + +#endif diff --git a/src/seastar/dpdk/lib/librte_vhost/rte_vhost.h b/src/seastar/dpdk/lib/librte_vhost/rte_vhost.h new file mode 100644 index 00000000..605e47cb --- /dev/null +++ b/src/seastar/dpdk/lib/librte_vhost/rte_vhost.h @@ -0,0 +1,439 @@ +/*- + * BSD LICENSE + * + * Copyright(c) 2010-2017 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 _RTE_VHOST_H_ +#define _RTE_VHOST_H_ + +/** + * @file + * Interface to vhost-user + */ + +#include <stdint.h> +#include <sys/eventfd.h> + +#include <rte_memory.h> +#include <rte_mempool.h> + +#ifdef __cplusplus +extern "C" { +#endif + +/* These are not C++-aware. */ +#include <linux/vhost.h> +#include <linux/virtio_ring.h> + +#define RTE_VHOST_USER_CLIENT (1ULL << 0) +#define RTE_VHOST_USER_NO_RECONNECT (1ULL << 1) +#define RTE_VHOST_USER_DEQUEUE_ZERO_COPY (1ULL << 2) + +/** + * Information relating to memory regions including offsets to + * addresses in QEMUs memory file. + */ +struct rte_vhost_mem_region { + uint64_t guest_phys_addr; + uint64_t guest_user_addr; + uint64_t host_user_addr; + uint64_t size; + void *mmap_addr; + uint64_t mmap_size; + int fd; +}; + +/** + * Memory structure includes region and mapping information. + */ +struct rte_vhost_memory { + uint32_t nregions; + struct rte_vhost_mem_region regions[]; +}; + +struct rte_vhost_vring { + struct vring_desc *desc; + struct vring_avail *avail; + struct vring_used *used; + uint64_t log_guest_addr; + + int callfd; + int kickfd; + uint16_t size; +}; + +/** + * Device and vring operations. + */ +struct vhost_device_ops { + int (*new_device)(int vid); /**< Add device. */ + void (*destroy_device)(int vid); /**< Remove device. */ + + int (*vring_state_changed)(int vid, uint16_t queue_id, int enable); /**< triggered when a vring is enabled or disabled */ + + /** + * Features could be changed after the feature negotiation. + * For example, VHOST_F_LOG_ALL will be set/cleared at the + * start/end of live migration, respectively. This callback + * is used to inform the application on such change. + */ + int (*features_changed)(int vid, uint64_t features); + + void *reserved[4]; /**< Reserved for future extension */ +}; + +/** + * Convert guest physical address to host virtual address + * + * @param mem + * the guest memory regions + * @param gpa + * the guest physical address for querying + * @return + * the host virtual address on success, 0 on failure + */ +static inline uint64_t __attribute__((always_inline)) +rte_vhost_gpa_to_vva(struct rte_vhost_memory *mem, uint64_t gpa) +{ + struct rte_vhost_mem_region *reg; + uint32_t i; + + for (i = 0; i < mem->nregions; i++) { + reg = &mem->regions[i]; + if (gpa >= reg->guest_phys_addr && + gpa < reg->guest_phys_addr + reg->size) { + return gpa - reg->guest_phys_addr + + reg->host_user_addr; + } + } + + return 0; +} + +#define RTE_VHOST_NEED_LOG(features) ((features) & (1ULL << VHOST_F_LOG_ALL)) + +/** + * Log the memory write start with given address. + * + * This function only need be invoked when the live migration starts. + * Therefore, we won't need call it at all in the most of time. For + * making the performance impact be minimum, it's suggested to do a + * check before calling it: + * + * if (unlikely(RTE_VHOST_NEED_LOG(features))) + * rte_vhost_log_write(vid, addr, len); + * + * @param vid + * vhost device ID + * @param addr + * the starting address for write + * @param len + * the length to write + */ +void rte_vhost_log_write(int vid, uint64_t addr, uint64_t len); + +/** + * Log the used ring update start at given offset. + * + * Same as rte_vhost_log_write, it's suggested to do a check before + * calling it: + * + * if (unlikely(RTE_VHOST_NEED_LOG(features))) + * rte_vhost_log_used_vring(vid, vring_idx, offset, len); + * + * @param vid + * vhost device ID + * @param vring_idx + * the vring index + * @param offset + * the offset inside the used ring + * @param len + * the length to write + */ +void rte_vhost_log_used_vring(int vid, uint16_t vring_idx, + uint64_t offset, uint64_t len); + +int rte_vhost_enable_guest_notification(int vid, uint16_t queue_id, int enable); + +/** + * Register vhost driver. path could be different for multiple + * instance support. + */ +int rte_vhost_driver_register(const char *path, uint64_t flags); + +/* Unregister vhost driver. This is only meaningful to vhost user. */ +int rte_vhost_driver_unregister(const char *path); + +/** + * Set the feature bits the vhost-user driver supports. + * + * @param path + * The vhost-user socket file path + * @param features + * Supported features + * @return + * 0 on success, -1 on failure + */ +int rte_vhost_driver_set_features(const char *path, uint64_t features); + +/** + * Enable vhost-user driver features. + * + * Note that + * - the param features should be a subset of the feature bits provided + * by rte_vhost_driver_set_features(). + * - it must be invoked before vhost-user negotiation starts. + * + * @param path + * The vhost-user socket file path + * @param features + * Features to enable + * @return + * 0 on success, -1 on failure + */ +int rte_vhost_driver_enable_features(const char *path, uint64_t features); + +/** + * Disable vhost-user driver features. + * + * The two notes at rte_vhost_driver_enable_features() also apply here. + * + * @param path + * The vhost-user socket file path + * @param features + * Features to disable + * @return + * 0 on success, -1 on failure + */ +int rte_vhost_driver_disable_features(const char *path, uint64_t features); + +/** + * Get the feature bits before feature negotiation. + * + * @param path + * The vhost-user socket file path + * @param features + * A pointer to store the queried feature bits + * @return + * 0 on success, -1 on failure + */ +int rte_vhost_driver_get_features(const char *path, uint64_t *features); + +/** + * Get the feature bits after negotiation + * + * @param vid + * Vhost device ID + * @param features + * A pointer to store the queried feature bits + * @return + * 0 on success, -1 on failure + */ +int rte_vhost_get_negotiated_features(int vid, uint64_t *features); + +/* Register callbacks. */ +int rte_vhost_driver_callback_register(const char *path, + struct vhost_device_ops const * const ops); + +/** + * + * Start the vhost-user driver. + * + * This function triggers the vhost-user negotiation. + * + * @param path + * The vhost-user socket file path + * @return + * 0 on success, -1 on failure + */ +int rte_vhost_driver_start(const char *path); + +/** + * Get the MTU value of the device if set in QEMU. + * + * @param vid + * virtio-net device ID + * @param mtu + * The variable to store the MTU value + * + * @return + * 0: success + * -EAGAIN: device not yet started + * -ENOTSUP: device does not support MTU feature + */ +int rte_vhost_get_mtu(int vid, uint16_t *mtu); + +/** + * Get the numa node from which the virtio net device's memory + * is allocated. + * + * @param vid + * vhost device ID + * + * @return + * The numa node, -1 on failure + */ +int rte_vhost_get_numa_node(int vid); + +/** + * @deprecated + * Get the number of queues the device supports. + * + * Note this function is deprecated, as it returns a queue pair number, + * which is vhost specific. Instead, rte_vhost_get_vring_num should + * be used. + * + * @param vid + * vhost device ID + * + * @return + * The number of queues, 0 on failure + */ +__rte_deprecated +uint32_t rte_vhost_get_queue_num(int vid); + +/** + * Get the number of vrings the device supports. + * + * @param vid + * vhost device ID + * + * @return + * The number of vrings, 0 on failure + */ +uint16_t rte_vhost_get_vring_num(int vid); + +/** + * Get the virtio net device's ifname, which is the vhost-user socket + * file path. + * + * @param vid + * vhost device ID + * @param buf + * The buffer to stored the queried ifname + * @param len + * The length of buf + * + * @return + * 0 on success, -1 on failure + */ +int rte_vhost_get_ifname(int vid, char *buf, size_t len); + +/** + * Get how many avail entries are left in the queue + * + * @param vid + * vhost device ID + * @param queue_id + * virtio queue index + * + * @return + * num of avail entires left + */ +uint16_t rte_vhost_avail_entries(int vid, uint16_t queue_id); + +struct rte_mbuf; +struct rte_mempool; +/** + * This function adds buffers to the virtio devices RX virtqueue. Buffers can + * be received from the physical port or from another virtual device. A packet + * count is returned to indicate the number of packets that were succesfully + * added to the RX queue. + * @param vid + * vhost device ID + * @param queue_id + * virtio queue index in mq case + * @param pkts + * array to contain packets to be enqueued + * @param count + * packets num to be enqueued + * @return + * num of packets enqueued + */ +uint16_t rte_vhost_enqueue_burst(int vid, uint16_t queue_id, + struct rte_mbuf **pkts, uint16_t count); + +/** + * This function gets guest buffers from the virtio device TX virtqueue, + * construct host mbufs, copies guest buffer content to host mbufs and + * store them in pkts to be processed. + * @param vid + * vhost device ID + * @param queue_id + * virtio queue index in mq case + * @param mbuf_pool + * mbuf_pool where host mbuf is allocated. + * @param pkts + * array to contain packets to be dequeued + * @param count + * packets num to be dequeued + * @return + * num of packets dequeued + */ +uint16_t rte_vhost_dequeue_burst(int vid, uint16_t queue_id, + struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t count); + +/** + * Get guest mem table: a list of memory regions. + * + * An rte_vhost_vhost_memory object will be allocated internaly, to hold the + * guest memory regions. Application should free it at destroy_device() + * callback. + * + * @param vid + * vhost device ID + * @param mem + * To store the returned mem regions + * @return + * 0 on success, -1 on failure + */ +int rte_vhost_get_mem_table(int vid, struct rte_vhost_memory **mem); + +/** + * Get guest vring info, including the vring address, vring size, etc. + * + * @param vid + * vhost device ID + * @param vring_idx + * vring index + * @param vring + * the structure to hold the requested vring info + * @return + * 0 on success, -1 on failure + */ +int rte_vhost_get_vhost_vring(int vid, uint16_t vring_idx, + struct rte_vhost_vring *vring); + +#ifdef __cplusplus +} +#endif + +#endif /* _RTE_VHOST_H_ */ diff --git a/src/seastar/dpdk/lib/librte_vhost/rte_vhost_version.map b/src/seastar/dpdk/lib/librte_vhost/rte_vhost_version.map new file mode 100644 index 00000000..07858732 --- /dev/null +++ b/src/seastar/dpdk/lib/librte_vhost/rte_vhost_version.map @@ -0,0 +1,47 @@ +DPDK_2.0 { + global: + + rte_vhost_dequeue_burst; + rte_vhost_driver_callback_register; + rte_vhost_driver_register; + rte_vhost_enable_guest_notification; + rte_vhost_enqueue_burst; + + local: *; +}; + +DPDK_2.1 { + global: + + rte_vhost_driver_unregister; + +} DPDK_2.0; + +DPDK_16.07 { + global: + + rte_vhost_avail_entries; + rte_vhost_get_ifname; + rte_vhost_get_numa_node; + rte_vhost_get_queue_num; + +} DPDK_2.1; + +DPDK_17.05 { + global: + + rte_vhost_driver_disable_features; + rte_vhost_driver_enable_features; + rte_vhost_driver_get_features; + rte_vhost_driver_set_features; + rte_vhost_driver_start; + rte_vhost_get_mem_table; + rte_vhost_get_mtu; + rte_vhost_get_negotiated_features; + rte_vhost_get_vhost_vring; + rte_vhost_get_vring_num; + rte_vhost_gpa_to_vva; + rte_vhost_log_used_vring; + rte_vhost_log_write; + +} DPDK_16.07; diff --git a/src/seastar/dpdk/lib/librte_vhost/socket.c b/src/seastar/dpdk/lib/librte_vhost/socket.c new file mode 100644 index 00000000..c7f99b08 --- /dev/null +++ b/src/seastar/dpdk/lib/librte_vhost/socket.c @@ -0,0 +1,798 @@ +/*- + * 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 <stdio.h> +#include <stdbool.h> +#include <limits.h> +#include <stdlib.h> +#include <unistd.h> +#include <string.h> +#include <sys/types.h> +#include <sys/socket.h> +#include <sys/un.h> +#include <sys/queue.h> +#include <errno.h> +#include <fcntl.h> +#include <pthread.h> + +#include <rte_log.h> + +#include "fd_man.h" +#include "vhost.h" +#include "vhost_user.h" + + +TAILQ_HEAD(vhost_user_connection_list, vhost_user_connection); + +/* + * Every time rte_vhost_driver_register() is invoked, an associated + * vhost_user_socket struct will be created. + */ +struct vhost_user_socket { + struct vhost_user_connection_list conn_list; + pthread_mutex_t conn_mutex; + char *path; + int socket_fd; + struct sockaddr_un un; + bool is_server; + bool reconnect; + bool dequeue_zero_copy; + + /* + * The "supported_features" indicates the feature bits the + * vhost driver supports. The "features" indicates the feature + * bits after the rte_vhost_driver_features_disable/enable(). + * It is also the final feature bits used for vhost-user + * features negotiation. + */ + uint64_t supported_features; + uint64_t features; + + struct vhost_device_ops const *notify_ops; +}; + +struct vhost_user_connection { + struct vhost_user_socket *vsocket; + int connfd; + int vid; + + TAILQ_ENTRY(vhost_user_connection) next; +}; + +#define MAX_VHOST_SOCKET 1024 +struct vhost_user { + struct vhost_user_socket *vsockets[MAX_VHOST_SOCKET]; + struct fdset fdset; + int vsocket_cnt; + pthread_mutex_t mutex; +}; + +#define MAX_VIRTIO_BACKLOG 128 + +static void vhost_user_server_new_connection(int fd, void *data, int *remove); +static void vhost_user_read_cb(int fd, void *dat, int *remove); +static int create_unix_socket(struct vhost_user_socket *vsocket); +static int vhost_user_start_client(struct vhost_user_socket *vsocket); + +static struct vhost_user vhost_user = { + .fdset = { + .fd = { [0 ... MAX_FDS - 1] = {-1, NULL, NULL, NULL, 0} }, + .fd_mutex = PTHREAD_MUTEX_INITIALIZER, + .num = 0 + }, + .vsocket_cnt = 0, + .mutex = PTHREAD_MUTEX_INITIALIZER, +}; + +/* return bytes# of read on success or negative val on failure. */ +int +read_fd_message(int sockfd, char *buf, int buflen, int *fds, int fd_num) +{ + struct iovec iov; + struct msghdr msgh; + size_t fdsize = fd_num * sizeof(int); + char control[CMSG_SPACE(fdsize)]; + struct cmsghdr *cmsg; + int ret; + + memset(&msgh, 0, sizeof(msgh)); + iov.iov_base = buf; + iov.iov_len = buflen; + + msgh.msg_iov = &iov; + msgh.msg_iovlen = 1; + msgh.msg_control = control; + msgh.msg_controllen = sizeof(control); + + ret = recvmsg(sockfd, &msgh, 0); + if (ret <= 0) { + RTE_LOG(ERR, VHOST_CONFIG, "recvmsg failed\n"); + return ret; + } + + if (msgh.msg_flags & (MSG_TRUNC | MSG_CTRUNC)) { + RTE_LOG(ERR, VHOST_CONFIG, "truncted msg\n"); + return -1; + } + + for (cmsg = CMSG_FIRSTHDR(&msgh); cmsg != NULL; + cmsg = CMSG_NXTHDR(&msgh, cmsg)) { + if ((cmsg->cmsg_level == SOL_SOCKET) && + (cmsg->cmsg_type == SCM_RIGHTS)) { + memcpy(fds, CMSG_DATA(cmsg), fdsize); + break; + } + } + + return ret; +} + +int +send_fd_message(int sockfd, char *buf, int buflen, int *fds, int fd_num) +{ + + struct iovec iov; + struct msghdr msgh; + size_t fdsize = fd_num * sizeof(int); + char control[CMSG_SPACE(fdsize)]; + struct cmsghdr *cmsg; + int ret; + + memset(&msgh, 0, sizeof(msgh)); + iov.iov_base = buf; + iov.iov_len = buflen; + + msgh.msg_iov = &iov; + msgh.msg_iovlen = 1; + + if (fds && fd_num > 0) { + msgh.msg_control = control; + msgh.msg_controllen = sizeof(control); + cmsg = CMSG_FIRSTHDR(&msgh); + cmsg->cmsg_len = CMSG_LEN(fdsize); + cmsg->cmsg_level = SOL_SOCKET; + cmsg->cmsg_type = SCM_RIGHTS; + memcpy(CMSG_DATA(cmsg), fds, fdsize); + } else { + msgh.msg_control = NULL; + msgh.msg_controllen = 0; + } + + do { + ret = sendmsg(sockfd, &msgh, 0); + } while (ret < 0 && errno == EINTR); + + if (ret < 0) { + RTE_LOG(ERR, VHOST_CONFIG, "sendmsg error\n"); + return ret; + } + + return ret; +} + +static void +vhost_user_add_connection(int fd, struct vhost_user_socket *vsocket) +{ + int vid; + size_t size; + struct vhost_user_connection *conn; + int ret; + + conn = malloc(sizeof(*conn)); + if (conn == NULL) { + close(fd); + return; + } + + vid = vhost_new_device(); + if (vid == -1) { + close(fd); + free(conn); + return; + } + + size = strnlen(vsocket->path, PATH_MAX); + vhost_set_ifname(vid, vsocket->path, size); + + if (vsocket->dequeue_zero_copy) + vhost_enable_dequeue_zero_copy(vid); + + RTE_LOG(INFO, VHOST_CONFIG, "new device, handle is %d\n", vid); + + conn->connfd = fd; + conn->vsocket = vsocket; + conn->vid = vid; + ret = fdset_add(&vhost_user.fdset, fd, vhost_user_read_cb, + NULL, conn); + if (ret < 0) { + conn->connfd = -1; + free(conn); + close(fd); + RTE_LOG(ERR, VHOST_CONFIG, + "failed to add fd %d into vhost server fdset\n", + fd); + return; + } + + pthread_mutex_lock(&vsocket->conn_mutex); + TAILQ_INSERT_TAIL(&vsocket->conn_list, conn, next); + pthread_mutex_unlock(&vsocket->conn_mutex); +} + +/* call back when there is new vhost-user connection from client */ +static void +vhost_user_server_new_connection(int fd, void *dat, int *remove __rte_unused) +{ + struct vhost_user_socket *vsocket = dat; + + fd = accept(fd, NULL, NULL); + if (fd < 0) + return; + + RTE_LOG(INFO, VHOST_CONFIG, "new vhost user connection is %d\n", fd); + vhost_user_add_connection(fd, vsocket); +} + +static void +vhost_user_read_cb(int connfd, void *dat, int *remove) +{ + struct vhost_user_connection *conn = dat; + struct vhost_user_socket *vsocket = conn->vsocket; + int ret; + + ret = vhost_user_msg_handler(conn->vid, connfd); + if (ret < 0) { + close(connfd); + *remove = 1; + vhost_destroy_device(conn->vid); + + pthread_mutex_lock(&vsocket->conn_mutex); + TAILQ_REMOVE(&vsocket->conn_list, conn, next); + pthread_mutex_unlock(&vsocket->conn_mutex); + + free(conn); + + if (vsocket->reconnect) { + create_unix_socket(vsocket); + vhost_user_start_client(vsocket); + } + } +} + +static int +create_unix_socket(struct vhost_user_socket *vsocket) +{ + int fd; + struct sockaddr_un *un = &vsocket->un; + + fd = socket(AF_UNIX, SOCK_STREAM, 0); + if (fd < 0) + return -1; + RTE_LOG(INFO, VHOST_CONFIG, "vhost-user %s: socket created, fd: %d\n", + vsocket->is_server ? "server" : "client", fd); + + if (!vsocket->is_server && fcntl(fd, F_SETFL, O_NONBLOCK)) { + RTE_LOG(ERR, VHOST_CONFIG, + "vhost-user: can't set nonblocking mode for socket, fd: " + "%d (%s)\n", fd, strerror(errno)); + close(fd); + return -1; + } + + memset(un, 0, sizeof(*un)); + un->sun_family = AF_UNIX; + strncpy(un->sun_path, vsocket->path, sizeof(un->sun_path)); + un->sun_path[sizeof(un->sun_path) - 1] = '\0'; + + vsocket->socket_fd = fd; + return 0; +} + +static int +vhost_user_start_server(struct vhost_user_socket *vsocket) +{ + int ret; + int fd = vsocket->socket_fd; + const char *path = vsocket->path; + + ret = bind(fd, (struct sockaddr *)&vsocket->un, sizeof(vsocket->un)); + if (ret < 0) { + RTE_LOG(ERR, VHOST_CONFIG, + "failed to bind to %s: %s; remove it and try again\n", + path, strerror(errno)); + goto err; + } + RTE_LOG(INFO, VHOST_CONFIG, "bind to %s\n", path); + + ret = listen(fd, MAX_VIRTIO_BACKLOG); + if (ret < 0) + goto err; + + ret = fdset_add(&vhost_user.fdset, fd, vhost_user_server_new_connection, + NULL, vsocket); + if (ret < 0) { + RTE_LOG(ERR, VHOST_CONFIG, + "failed to add listen fd %d to vhost server fdset\n", + fd); + goto err; + } + + return 0; + +err: + close(fd); + return -1; +} + +struct vhost_user_reconnect { + struct sockaddr_un un; + int fd; + struct vhost_user_socket *vsocket; + + TAILQ_ENTRY(vhost_user_reconnect) next; +}; + +TAILQ_HEAD(vhost_user_reconnect_tailq_list, vhost_user_reconnect); +struct vhost_user_reconnect_list { + struct vhost_user_reconnect_tailq_list head; + pthread_mutex_t mutex; +}; + +static struct vhost_user_reconnect_list reconn_list; +static pthread_t reconn_tid; + +static int +vhost_user_connect_nonblock(int fd, struct sockaddr *un, size_t sz) +{ + int ret, flags; + + ret = connect(fd, un, sz); + if (ret < 0 && errno != EISCONN) + return -1; + + flags = fcntl(fd, F_GETFL, 0); + if (flags < 0) { + RTE_LOG(ERR, VHOST_CONFIG, + "can't get flags for connfd %d\n", fd); + return -2; + } + if ((flags & O_NONBLOCK) && fcntl(fd, F_SETFL, flags & ~O_NONBLOCK)) { + RTE_LOG(ERR, VHOST_CONFIG, + "can't disable nonblocking on fd %d\n", fd); + return -2; + } + return 0; +} + +static void * +vhost_user_client_reconnect(void *arg __rte_unused) +{ + int ret; + struct vhost_user_reconnect *reconn, *next; + + while (1) { + pthread_mutex_lock(&reconn_list.mutex); + + /* + * An equal implementation of TAILQ_FOREACH_SAFE, + * which does not exist on all platforms. + */ + for (reconn = TAILQ_FIRST(&reconn_list.head); + reconn != NULL; reconn = next) { + next = TAILQ_NEXT(reconn, next); + + ret = vhost_user_connect_nonblock(reconn->fd, + (struct sockaddr *)&reconn->un, + sizeof(reconn->un)); + if (ret == -2) { + close(reconn->fd); + RTE_LOG(ERR, VHOST_CONFIG, + "reconnection for fd %d failed\n", + reconn->fd); + goto remove_fd; + } + if (ret == -1) + continue; + + RTE_LOG(INFO, VHOST_CONFIG, + "%s: connected\n", reconn->vsocket->path); + vhost_user_add_connection(reconn->fd, reconn->vsocket); +remove_fd: + TAILQ_REMOVE(&reconn_list.head, reconn, next); + free(reconn); + } + + pthread_mutex_unlock(&reconn_list.mutex); + sleep(1); + } + + return NULL; +} + +static int +vhost_user_reconnect_init(void) +{ + int ret; + + pthread_mutex_init(&reconn_list.mutex, NULL); + TAILQ_INIT(&reconn_list.head); + + ret = pthread_create(&reconn_tid, NULL, + vhost_user_client_reconnect, NULL); + if (ret < 0) + RTE_LOG(ERR, VHOST_CONFIG, "failed to create reconnect thread"); + + return ret; +} + +static int +vhost_user_start_client(struct vhost_user_socket *vsocket) +{ + int ret; + int fd = vsocket->socket_fd; + const char *path = vsocket->path; + struct vhost_user_reconnect *reconn; + + ret = vhost_user_connect_nonblock(fd, (struct sockaddr *)&vsocket->un, + sizeof(vsocket->un)); + if (ret == 0) { + vhost_user_add_connection(fd, vsocket); + return 0; + } + + RTE_LOG(WARNING, VHOST_CONFIG, + "failed to connect to %s: %s\n", + path, strerror(errno)); + + if (ret == -2 || !vsocket->reconnect) { + close(fd); + return -1; + } + + RTE_LOG(INFO, VHOST_CONFIG, "%s: reconnecting...\n", path); + reconn = malloc(sizeof(*reconn)); + if (reconn == NULL) { + RTE_LOG(ERR, VHOST_CONFIG, + "failed to allocate memory for reconnect\n"); + close(fd); + return -1; + } + reconn->un = vsocket->un; + reconn->fd = fd; + reconn->vsocket = vsocket; + pthread_mutex_lock(&reconn_list.mutex); + TAILQ_INSERT_TAIL(&reconn_list.head, reconn, next); + pthread_mutex_unlock(&reconn_list.mutex); + + return 0; +} + +static struct vhost_user_socket * +find_vhost_user_socket(const char *path) +{ + int i; + + for (i = 0; i < vhost_user.vsocket_cnt; i++) { + struct vhost_user_socket *vsocket = vhost_user.vsockets[i]; + + if (!strcmp(vsocket->path, path)) + return vsocket; + } + + return NULL; +} + +int +rte_vhost_driver_disable_features(const char *path, uint64_t features) +{ + struct vhost_user_socket *vsocket; + + pthread_mutex_lock(&vhost_user.mutex); + vsocket = find_vhost_user_socket(path); + if (vsocket) + vsocket->features &= ~features; + pthread_mutex_unlock(&vhost_user.mutex); + + return vsocket ? 0 : -1; +} + +int +rte_vhost_driver_enable_features(const char *path, uint64_t features) +{ + struct vhost_user_socket *vsocket; + + pthread_mutex_lock(&vhost_user.mutex); + vsocket = find_vhost_user_socket(path); + if (vsocket) { + if ((vsocket->supported_features & features) != features) { + /* + * trying to enable features the driver doesn't + * support. + */ + pthread_mutex_unlock(&vhost_user.mutex); + return -1; + } + vsocket->features |= features; + } + pthread_mutex_unlock(&vhost_user.mutex); + + return vsocket ? 0 : -1; +} + +int +rte_vhost_driver_set_features(const char *path, uint64_t features) +{ + struct vhost_user_socket *vsocket; + + pthread_mutex_lock(&vhost_user.mutex); + vsocket = find_vhost_user_socket(path); + if (vsocket) { + vsocket->supported_features = features; + vsocket->features = features; + } + pthread_mutex_unlock(&vhost_user.mutex); + + return vsocket ? 0 : -1; +} + +int +rte_vhost_driver_get_features(const char *path, uint64_t *features) +{ + struct vhost_user_socket *vsocket; + + pthread_mutex_lock(&vhost_user.mutex); + vsocket = find_vhost_user_socket(path); + if (vsocket) + *features = vsocket->features; + pthread_mutex_unlock(&vhost_user.mutex); + + if (!vsocket) { + RTE_LOG(ERR, VHOST_CONFIG, + "socket file %s is not registered yet.\n", path); + return -1; + } else { + return 0; + } +} + +/* + * Register a new vhost-user socket; here we could act as server + * (the default case), or client (when RTE_VHOST_USER_CLIENT) flag + * is set. + */ +int +rte_vhost_driver_register(const char *path, uint64_t flags) +{ + int ret = -1; + struct vhost_user_socket *vsocket; + + if (!path) + return -1; + + pthread_mutex_lock(&vhost_user.mutex); + + if (vhost_user.vsocket_cnt == MAX_VHOST_SOCKET) { + RTE_LOG(ERR, VHOST_CONFIG, + "error: the number of vhost sockets reaches maximum\n"); + goto out; + } + + vsocket = malloc(sizeof(struct vhost_user_socket)); + if (!vsocket) + goto out; + memset(vsocket, 0, sizeof(struct vhost_user_socket)); + vsocket->path = strdup(path); + TAILQ_INIT(&vsocket->conn_list); + pthread_mutex_init(&vsocket->conn_mutex, NULL); + vsocket->dequeue_zero_copy = flags & RTE_VHOST_USER_DEQUEUE_ZERO_COPY; + + /* + * Set the supported features correctly for the builtin vhost-user + * net driver. + * + * Applications know nothing about features the builtin virtio net + * driver (virtio_net.c) supports, thus it's not possible for them + * to invoke rte_vhost_driver_set_features(). To workaround it, here + * we set it unconditionally. If the application want to implement + * another vhost-user driver (say SCSI), it should call the + * rte_vhost_driver_set_features(), which will overwrite following + * two values. + */ + vsocket->supported_features = VIRTIO_NET_SUPPORTED_FEATURES; + vsocket->features = VIRTIO_NET_SUPPORTED_FEATURES; + + if ((flags & RTE_VHOST_USER_CLIENT) != 0) { + vsocket->reconnect = !(flags & RTE_VHOST_USER_NO_RECONNECT); + if (vsocket->reconnect && reconn_tid == 0) { + if (vhost_user_reconnect_init() < 0) { + free(vsocket->path); + free(vsocket); + goto out; + } + } + } else { + vsocket->is_server = true; + } + ret = create_unix_socket(vsocket); + if (ret < 0) { + free(vsocket->path); + free(vsocket); + goto out; + } + + vhost_user.vsockets[vhost_user.vsocket_cnt++] = vsocket; + +out: + pthread_mutex_unlock(&vhost_user.mutex); + + return ret; +} + +static bool +vhost_user_remove_reconnect(struct vhost_user_socket *vsocket) +{ + int found = false; + struct vhost_user_reconnect *reconn, *next; + + pthread_mutex_lock(&reconn_list.mutex); + + for (reconn = TAILQ_FIRST(&reconn_list.head); + reconn != NULL; reconn = next) { + next = TAILQ_NEXT(reconn, next); + + if (reconn->vsocket == vsocket) { + TAILQ_REMOVE(&reconn_list.head, reconn, next); + close(reconn->fd); + free(reconn); + found = true; + break; + } + } + pthread_mutex_unlock(&reconn_list.mutex); + return found; +} + +/** + * Unregister the specified vhost socket + */ +int +rte_vhost_driver_unregister(const char *path) +{ + int i; + int count; + struct vhost_user_connection *conn, *next; + + pthread_mutex_lock(&vhost_user.mutex); + + for (i = 0; i < vhost_user.vsocket_cnt; i++) { + struct vhost_user_socket *vsocket = vhost_user.vsockets[i]; + + if (!strcmp(vsocket->path, path)) { + if (vsocket->is_server) { + fdset_del(&vhost_user.fdset, vsocket->socket_fd); + close(vsocket->socket_fd); + unlink(path); + } else if (vsocket->reconnect) { + vhost_user_remove_reconnect(vsocket); + } + + pthread_mutex_lock(&vsocket->conn_mutex); + for (conn = TAILQ_FIRST(&vsocket->conn_list); + conn != NULL; + conn = next) { + next = TAILQ_NEXT(conn, next); + + fdset_del(&vhost_user.fdset, conn->connfd); + RTE_LOG(INFO, VHOST_CONFIG, + "free connfd = %d for device '%s'\n", + conn->connfd, path); + close(conn->connfd); + vhost_destroy_device(conn->vid); + TAILQ_REMOVE(&vsocket->conn_list, conn, next); + free(conn); + } + pthread_mutex_unlock(&vsocket->conn_mutex); + + free(vsocket->path); + free(vsocket); + + count = --vhost_user.vsocket_cnt; + vhost_user.vsockets[i] = vhost_user.vsockets[count]; + vhost_user.vsockets[count] = NULL; + pthread_mutex_unlock(&vhost_user.mutex); + + return 0; + } + } + pthread_mutex_unlock(&vhost_user.mutex); + + return -1; +} + +/* + * Register ops so that we can add/remove device to data core. + */ +int +rte_vhost_driver_callback_register(const char *path, + struct vhost_device_ops const * const ops) +{ + struct vhost_user_socket *vsocket; + + pthread_mutex_lock(&vhost_user.mutex); + vsocket = find_vhost_user_socket(path); + if (vsocket) + vsocket->notify_ops = ops; + pthread_mutex_unlock(&vhost_user.mutex); + + return vsocket ? 0 : -1; +} + +struct vhost_device_ops const * +vhost_driver_callback_get(const char *path) +{ + struct vhost_user_socket *vsocket; + + pthread_mutex_lock(&vhost_user.mutex); + vsocket = find_vhost_user_socket(path); + pthread_mutex_unlock(&vhost_user.mutex); + + return vsocket ? vsocket->notify_ops : NULL; +} + +int +rte_vhost_driver_start(const char *path) +{ + struct vhost_user_socket *vsocket; + static pthread_t fdset_tid; + + pthread_mutex_lock(&vhost_user.mutex); + vsocket = find_vhost_user_socket(path); + pthread_mutex_unlock(&vhost_user.mutex); + + if (!vsocket) + return -1; + + if (fdset_tid == 0) { + int ret = pthread_create(&fdset_tid, NULL, fdset_event_dispatch, + &vhost_user.fdset); + if (ret < 0) + RTE_LOG(ERR, VHOST_CONFIG, + "failed to create fdset handling thread"); + } + + if (vsocket->is_server) + return vhost_user_start_server(vsocket); + else + return vhost_user_start_client(vsocket); +} diff --git a/src/seastar/dpdk/lib/librte_vhost/vhost.c b/src/seastar/dpdk/lib/librte_vhost/vhost.c new file mode 100644 index 00000000..0b19d2eb --- /dev/null +++ b/src/seastar/dpdk/lib/librte_vhost/vhost.c @@ -0,0 +1,477 @@ +/*- + * 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 <linux/vhost.h> +#include <linux/virtio_net.h> +#include <stddef.h> +#include <stdint.h> +#include <stdlib.h> +#ifdef RTE_LIBRTE_VHOST_NUMA +#include <numaif.h> +#endif + +#include <rte_ethdev.h> +#include <rte_log.h> +#include <rte_string_fns.h> +#include <rte_memory.h> +#include <rte_malloc.h> +#include <rte_vhost.h> + +#include "vhost.h" + +struct virtio_net *vhost_devices[MAX_VHOST_DEVICE]; + +struct virtio_net * +get_device(int vid) +{ + struct virtio_net *dev = vhost_devices[vid]; + + if (unlikely(!dev)) { + RTE_LOG(ERR, VHOST_CONFIG, + "(%d) device not found.\n", vid); + } + + return dev; +} + +static void +cleanup_vq(struct vhost_virtqueue *vq, int destroy) +{ + if ((vq->callfd >= 0) && (destroy != 0)) + close(vq->callfd); + if (vq->kickfd >= 0) + close(vq->kickfd); +} + +/* + * Unmap any memory, close any file descriptors and + * free any memory owned by a device. + */ +void +cleanup_device(struct virtio_net *dev, int destroy) +{ + uint32_t i; + + vhost_backend_cleanup(dev); + + for (i = 0; i < dev->nr_vring; i++) + cleanup_vq(dev->virtqueue[i], destroy); +} + +/* + * Release virtqueues and device memory. + */ +static void +free_device(struct virtio_net *dev) +{ + uint32_t i; + struct vhost_virtqueue *vq; + + for (i = 0; i < dev->nr_vring; i++) { + vq = dev->virtqueue[i]; + + rte_free(vq->shadow_used_ring); + + rte_free(vq); + } + + rte_free(dev); +} + +static void +init_vring_queue(struct vhost_virtqueue *vq) +{ + memset(vq, 0, sizeof(struct vhost_virtqueue)); + + vq->kickfd = VIRTIO_UNINITIALIZED_EVENTFD; + vq->callfd = VIRTIO_UNINITIALIZED_EVENTFD; + + /* Backends are set to -1 indicating an inactive device. */ + vq->backend = -1; + + /* + * always set the vq to enabled; this is to keep compatibility + * with the old QEMU, whereas there is no SET_VRING_ENABLE message. + */ + vq->enabled = 1; + + TAILQ_INIT(&vq->zmbuf_list); +} + +static void +reset_vring_queue(struct vhost_virtqueue *vq) +{ + int callfd; + + callfd = vq->callfd; + init_vring_queue(vq); + vq->callfd = callfd; +} + +int +alloc_vring_queue(struct virtio_net *dev, uint32_t vring_idx) +{ + struct vhost_virtqueue *vq; + + vq = rte_malloc(NULL, sizeof(struct vhost_virtqueue), 0); + if (vq == NULL) { + RTE_LOG(ERR, VHOST_CONFIG, + "Failed to allocate memory for vring:%u.\n", vring_idx); + return -1; + } + + dev->virtqueue[vring_idx] = vq; + init_vring_queue(vq); + + dev->nr_vring += 1; + + return 0; +} + +/* + * Reset some variables in device structure, while keeping few + * others untouched, such as vid, ifname, nr_vring: they + * should be same unless the device is removed. + */ +void +reset_device(struct virtio_net *dev) +{ + uint32_t i; + + dev->features = 0; + dev->protocol_features = 0; + dev->flags = 0; + + for (i = 0; i < dev->nr_vring; i++) + reset_vring_queue(dev->virtqueue[i]); +} + +/* + * Invoked when there is a new vhost-user connection established (when + * there is a new virtio device being attached). + */ +int +vhost_new_device(void) +{ + struct virtio_net *dev; + int i; + + dev = rte_zmalloc(NULL, sizeof(struct virtio_net), 0); + if (dev == NULL) { + RTE_LOG(ERR, VHOST_CONFIG, + "Failed to allocate memory for new dev.\n"); + return -1; + } + + for (i = 0; i < MAX_VHOST_DEVICE; i++) { + if (vhost_devices[i] == NULL) + break; + } + if (i == MAX_VHOST_DEVICE) { + RTE_LOG(ERR, VHOST_CONFIG, + "Failed to find a free slot for new device.\n"); + rte_free(dev); + return -1; + } + + vhost_devices[i] = dev; + dev->vid = i; + + return i; +} + +/* + * Invoked when there is the vhost-user connection is broken (when + * the virtio device is being detached). + */ +void +vhost_destroy_device(int vid) +{ + struct virtio_net *dev = get_device(vid); + + if (dev == NULL) + return; + + if (dev->flags & VIRTIO_DEV_RUNNING) { + dev->flags &= ~VIRTIO_DEV_RUNNING; + dev->notify_ops->destroy_device(vid); + } + + cleanup_device(dev, 1); + free_device(dev); + + vhost_devices[vid] = NULL; +} + +void +vhost_set_ifname(int vid, const char *if_name, unsigned int if_len) +{ + struct virtio_net *dev; + unsigned int len; + + dev = get_device(vid); + if (dev == NULL) + return; + + len = if_len > sizeof(dev->ifname) ? + sizeof(dev->ifname) : if_len; + + strncpy(dev->ifname, if_name, len); + dev->ifname[sizeof(dev->ifname) - 1] = '\0'; +} + +void +vhost_enable_dequeue_zero_copy(int vid) +{ + struct virtio_net *dev = get_device(vid); + + if (dev == NULL) + return; + + dev->dequeue_zero_copy = 1; +} + +int +rte_vhost_get_mtu(int vid, uint16_t *mtu) +{ + struct virtio_net *dev = get_device(vid); + + if (!dev) + return -ENODEV; + + if (!(dev->flags & VIRTIO_DEV_READY)) + return -EAGAIN; + + if (!(dev->features & VIRTIO_NET_F_MTU)) + return -ENOTSUP; + + *mtu = dev->mtu; + + return 0; +} + +int +rte_vhost_get_numa_node(int vid) +{ +#ifdef RTE_LIBRTE_VHOST_NUMA + struct virtio_net *dev = get_device(vid); + int numa_node; + int ret; + + if (dev == NULL) + return -1; + + ret = get_mempolicy(&numa_node, NULL, 0, dev, + MPOL_F_NODE | MPOL_F_ADDR); + if (ret < 0) { + RTE_LOG(ERR, VHOST_CONFIG, + "(%d) failed to query numa node: %d\n", vid, ret); + return -1; + } + + return numa_node; +#else + RTE_SET_USED(vid); + return -1; +#endif +} + +uint32_t +rte_vhost_get_queue_num(int vid) +{ + struct virtio_net *dev = get_device(vid); + + if (dev == NULL) + return 0; + + return dev->nr_vring / 2; +} + +uint16_t +rte_vhost_get_vring_num(int vid) +{ + struct virtio_net *dev = get_device(vid); + + if (dev == NULL) + return 0; + + return dev->nr_vring; +} + +int +rte_vhost_get_ifname(int vid, char *buf, size_t len) +{ + struct virtio_net *dev = get_device(vid); + + if (dev == NULL) + return -1; + + len = RTE_MIN(len, sizeof(dev->ifname)); + + strncpy(buf, dev->ifname, len); + buf[len - 1] = '\0'; + + return 0; +} + +int +rte_vhost_get_negotiated_features(int vid, uint64_t *features) +{ + struct virtio_net *dev; + + dev = get_device(vid); + if (!dev) + return -1; + + *features = dev->features; + return 0; +} + +int +rte_vhost_get_mem_table(int vid, struct rte_vhost_memory **mem) +{ + struct virtio_net *dev; + struct rte_vhost_memory *m; + size_t size; + + dev = get_device(vid); + if (!dev) + return -1; + + size = dev->mem->nregions * sizeof(struct rte_vhost_mem_region); + m = malloc(size); + if (!m) + return -1; + + m->nregions = dev->mem->nregions; + memcpy(m->regions, dev->mem->regions, size); + *mem = m; + + return 0; +} + +int +rte_vhost_get_vhost_vring(int vid, uint16_t vring_idx, + struct rte_vhost_vring *vring) +{ + struct virtio_net *dev; + struct vhost_virtqueue *vq; + + dev = get_device(vid); + if (!dev) + return -1; + + if (vring_idx >= VHOST_MAX_VRING) + return -1; + + vq = dev->virtqueue[vring_idx]; + if (!vq) + return -1; + + vring->desc = vq->desc; + vring->avail = vq->avail; + vring->used = vq->used; + vring->log_guest_addr = vq->log_guest_addr; + + vring->callfd = vq->callfd; + vring->kickfd = vq->kickfd; + vring->size = vq->size; + + return 0; +} + +uint16_t +rte_vhost_avail_entries(int vid, uint16_t queue_id) +{ + struct virtio_net *dev; + struct vhost_virtqueue *vq; + + dev = get_device(vid); + if (!dev) + return 0; + + vq = dev->virtqueue[queue_id]; + if (!vq->enabled) + return 0; + + return *(volatile uint16_t *)&vq->avail->idx - vq->last_used_idx; +} + +int +rte_vhost_enable_guest_notification(int vid, uint16_t queue_id, int enable) +{ + struct virtio_net *dev = get_device(vid); + + if (dev == NULL) + return -1; + + if (enable) { + RTE_LOG(ERR, VHOST_CONFIG, + "guest notification isn't supported.\n"); + return -1; + } + + dev->virtqueue[queue_id]->used->flags = VRING_USED_F_NO_NOTIFY; + return 0; +} + +void +rte_vhost_log_write(int vid, uint64_t addr, uint64_t len) +{ + struct virtio_net *dev = get_device(vid); + + if (dev == NULL) + return; + + vhost_log_write(dev, addr, len); +} + +void +rte_vhost_log_used_vring(int vid, uint16_t vring_idx, + uint64_t offset, uint64_t len) +{ + struct virtio_net *dev; + struct vhost_virtqueue *vq; + + dev = get_device(vid); + if (dev == NULL) + return; + + if (vring_idx >= VHOST_MAX_VRING) + return; + vq = dev->virtqueue[vring_idx]; + if (!vq) + return; + + vhost_log_used_vring(dev, vq, offset, len); +} diff --git a/src/seastar/dpdk/lib/librte_vhost/vhost.h b/src/seastar/dpdk/lib/librte_vhost/vhost.h new file mode 100644 index 00000000..ddd8a9c4 --- /dev/null +++ b/src/seastar/dpdk/lib/librte_vhost/vhost.h @@ -0,0 +1,315 @@ +/*- + * 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. + */ + +#ifndef _VHOST_NET_CDEV_H_ +#define _VHOST_NET_CDEV_H_ +#include <stdint.h> +#include <stdio.h> +#include <sys/types.h> +#include <sys/queue.h> +#include <unistd.h> +#include <linux/vhost.h> +#include <linux/virtio_net.h> +#include <sys/socket.h> +#include <linux/if.h> + +#include <rte_log.h> +#include <rte_ether.h> + +#include "rte_vhost.h" + +/* Used to indicate that the device is running on a data core */ +#define VIRTIO_DEV_RUNNING 1 +/* Used to indicate that the device is ready to operate */ +#define VIRTIO_DEV_READY 2 + +/* Backend value set by guest. */ +#define VIRTIO_DEV_STOPPED -1 + +#define BUF_VECTOR_MAX 256 + +/** + * Structure contains buffer address, length and descriptor index + * from vring to do scatter RX. + */ +struct buf_vector { + uint64_t buf_addr; + uint32_t buf_len; + uint32_t desc_idx; +}; + +/* + * A structure to hold some fields needed in zero copy code path, + * mainly for associating an mbuf with the right desc_idx. + */ +struct zcopy_mbuf { + struct rte_mbuf *mbuf; + uint32_t desc_idx; + uint16_t in_use; + + TAILQ_ENTRY(zcopy_mbuf) next; +}; +TAILQ_HEAD(zcopy_mbuf_list, zcopy_mbuf); + +/** + * Structure contains variables relevant to RX/TX virtqueues. + */ +struct vhost_virtqueue { + struct vring_desc *desc; + struct vring_avail *avail; + struct vring_used *used; + uint32_t size; + + uint16_t last_avail_idx; + uint16_t last_used_idx; +#define VIRTIO_INVALID_EVENTFD (-1) +#define VIRTIO_UNINITIALIZED_EVENTFD (-2) + + /* Backend value to determine if device should started/stopped */ + int backend; + /* Used to notify the guest (trigger interrupt) */ + int callfd; + /* Currently unused as polling mode is enabled */ + int kickfd; + int enabled; + + /* Physical address of used ring, for logging */ + uint64_t log_guest_addr; + + uint16_t nr_zmbuf; + uint16_t zmbuf_size; + uint16_t last_zmbuf_idx; + struct zcopy_mbuf *zmbufs; + struct zcopy_mbuf_list zmbuf_list; + + struct vring_used_elem *shadow_used_ring; + uint16_t shadow_used_idx; +} __rte_cache_aligned; + +/* Old kernels have no such macros defined */ +#ifndef VIRTIO_NET_F_GUEST_ANNOUNCE + #define VIRTIO_NET_F_GUEST_ANNOUNCE 21 +#endif + +#ifndef VIRTIO_NET_F_MQ + #define VIRTIO_NET_F_MQ 22 +#endif + +#define VHOST_MAX_VRING 0x100 +#define VHOST_MAX_QUEUE_PAIRS 0x80 + +#ifndef VIRTIO_NET_F_MTU + #define VIRTIO_NET_F_MTU 3 +#endif + +/* + * Define virtio 1.0 for older kernels + */ +#ifndef VIRTIO_F_VERSION_1 + #define VIRTIO_F_VERSION_1 32 +#endif + +#define VHOST_USER_F_PROTOCOL_FEATURES 30 + +/* Features supported by this builtin vhost-user net driver. */ +#define VIRTIO_NET_SUPPORTED_FEATURES ((1ULL << VIRTIO_NET_F_MRG_RXBUF) | \ + (1ULL << VIRTIO_NET_F_CTRL_VQ) | \ + (1ULL << VIRTIO_NET_F_CTRL_RX) | \ + (1ULL << VIRTIO_NET_F_GUEST_ANNOUNCE) | \ + (1ULL << VIRTIO_NET_F_MQ) | \ + (1ULL << VIRTIO_F_VERSION_1) | \ + (1ULL << VHOST_F_LOG_ALL) | \ + (1ULL << VHOST_USER_F_PROTOCOL_FEATURES) | \ + (1ULL << VIRTIO_NET_F_HOST_TSO4) | \ + (1ULL << VIRTIO_NET_F_HOST_TSO6) | \ + (1ULL << VIRTIO_NET_F_CSUM) | \ + (1ULL << VIRTIO_NET_F_GUEST_CSUM) | \ + (1ULL << VIRTIO_NET_F_GUEST_TSO4) | \ + (1ULL << VIRTIO_NET_F_GUEST_TSO6) | \ + (1ULL << VIRTIO_RING_F_INDIRECT_DESC) | \ + (1ULL << VIRTIO_NET_F_MTU)) + + +struct guest_page { + uint64_t guest_phys_addr; + uint64_t host_phys_addr; + uint64_t size; +}; + +/** + * Device structure contains all configuration information relating + * to the device. + */ +struct virtio_net { + /* Frontend (QEMU) memory and memory region information */ + struct rte_vhost_memory *mem; + uint64_t features; + uint64_t protocol_features; + int vid; + uint32_t flags; + uint16_t vhost_hlen; + /* to tell if we need broadcast rarp packet */ + rte_atomic16_t broadcast_rarp; + uint32_t nr_vring; + int dequeue_zero_copy; + struct vhost_virtqueue *virtqueue[VHOST_MAX_QUEUE_PAIRS * 2]; +#define IF_NAME_SZ (PATH_MAX > IFNAMSIZ ? PATH_MAX : IFNAMSIZ) + char ifname[IF_NAME_SZ]; + uint64_t log_size; + uint64_t log_base; + uint64_t log_addr; + struct ether_addr mac; + uint16_t mtu; + + struct vhost_device_ops const *notify_ops; + + uint32_t nr_guest_pages; + uint32_t max_guest_pages; + struct guest_page *guest_pages; +} __rte_cache_aligned; + + +#define VHOST_LOG_PAGE 4096 + +static inline void __attribute__((always_inline)) +vhost_log_page(uint8_t *log_base, uint64_t page) +{ + log_base[page / 8] |= 1 << (page % 8); +} + +static inline void __attribute__((always_inline)) +vhost_log_write(struct virtio_net *dev, uint64_t addr, uint64_t len) +{ + uint64_t page; + + if (likely(((dev->features & (1ULL << VHOST_F_LOG_ALL)) == 0) || + !dev->log_base || !len)) + return; + + if (unlikely(dev->log_size <= ((addr + len - 1) / VHOST_LOG_PAGE / 8))) + return; + + /* To make sure guest memory updates are committed before logging */ + rte_smp_wmb(); + + page = addr / VHOST_LOG_PAGE; + while (page * VHOST_LOG_PAGE < addr + len) { + vhost_log_page((uint8_t *)(uintptr_t)dev->log_base, page); + page += 1; + } +} + +static inline void __attribute__((always_inline)) +vhost_log_used_vring(struct virtio_net *dev, struct vhost_virtqueue *vq, + uint64_t offset, uint64_t len) +{ + vhost_log_write(dev, vq->log_guest_addr + offset, len); +} + +/* Macros for printing using RTE_LOG */ +#define RTE_LOGTYPE_VHOST_CONFIG RTE_LOGTYPE_USER1 +#define RTE_LOGTYPE_VHOST_DATA RTE_LOGTYPE_USER1 + +#ifdef RTE_LIBRTE_VHOST_DEBUG +#define VHOST_MAX_PRINT_BUFF 6072 +#define LOG_LEVEL RTE_LOG_DEBUG +#define LOG_DEBUG(log_type, fmt, args...) RTE_LOG(DEBUG, log_type, fmt, ##args) +#define PRINT_PACKET(device, addr, size, header) do { \ + char *pkt_addr = (char *)(addr); \ + unsigned int index; \ + char packet[VHOST_MAX_PRINT_BUFF]; \ + \ + if ((header)) \ + snprintf(packet, VHOST_MAX_PRINT_BUFF, "(%d) Header size %d: ", (device->vid), (size)); \ + else \ + snprintf(packet, VHOST_MAX_PRINT_BUFF, "(%d) Packet size %d: ", (device->vid), (size)); \ + for (index = 0; index < (size); index++) { \ + snprintf(packet + strnlen(packet, VHOST_MAX_PRINT_BUFF), VHOST_MAX_PRINT_BUFF - strnlen(packet, VHOST_MAX_PRINT_BUFF), \ + "%02hhx ", pkt_addr[index]); \ + } \ + snprintf(packet + strnlen(packet, VHOST_MAX_PRINT_BUFF), VHOST_MAX_PRINT_BUFF - strnlen(packet, VHOST_MAX_PRINT_BUFF), "\n"); \ + \ + LOG_DEBUG(VHOST_DATA, "%s", packet); \ +} while (0) +#else +#define LOG_LEVEL RTE_LOG_INFO +#define LOG_DEBUG(log_type, fmt, args...) do {} while (0) +#define PRINT_PACKET(device, addr, size, header) do {} while (0) +#endif + +extern uint64_t VHOST_FEATURES; +#define MAX_VHOST_DEVICE 1024 +extern struct virtio_net *vhost_devices[MAX_VHOST_DEVICE]; + +/* Convert guest physical address to host physical address */ +static inline phys_addr_t __attribute__((always_inline)) +gpa_to_hpa(struct virtio_net *dev, uint64_t gpa, uint64_t size) +{ + uint32_t i; + struct guest_page *page; + + for (i = 0; i < dev->nr_guest_pages; i++) { + page = &dev->guest_pages[i]; + + if (gpa >= page->guest_phys_addr && + gpa + size < page->guest_phys_addr + page->size) { + return gpa - page->guest_phys_addr + + page->host_phys_addr; + } + } + + return 0; +} + +struct virtio_net *get_device(int vid); + +int vhost_new_device(void); +void cleanup_device(struct virtio_net *dev, int destroy); +void reset_device(struct virtio_net *dev); +void vhost_destroy_device(int); + +int alloc_vring_queue(struct virtio_net *dev, uint32_t vring_idx); + +void vhost_set_ifname(int, const char *if_name, unsigned int if_len); +void vhost_enable_dequeue_zero_copy(int vid); + +struct vhost_device_ops const *vhost_driver_callback_get(const char *path); + +/* + * Backend-specific cleanup. + * + * TODO: fix it; we have one backend now + */ +void vhost_backend_cleanup(struct virtio_net *dev); + +#endif /* _VHOST_NET_CDEV_H_ */ diff --git a/src/seastar/dpdk/lib/librte_vhost/vhost_user.c b/src/seastar/dpdk/lib/librte_vhost/vhost_user.c new file mode 100644 index 00000000..5c8058b6 --- /dev/null +++ b/src/seastar/dpdk/lib/librte_vhost/vhost_user.c @@ -0,0 +1,1109 @@ +/*- + * 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 <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <sys/mman.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <assert.h> +#ifdef RTE_LIBRTE_VHOST_NUMA +#include <numaif.h> +#endif + +#include <rte_common.h> +#include <rte_malloc.h> +#include <rte_log.h> + +#include "vhost.h" +#include "vhost_user.h" + +#define VIRTIO_MIN_MTU 68 +#define VIRTIO_MAX_MTU 65535 + +static const char *vhost_message_str[VHOST_USER_MAX] = { + [VHOST_USER_NONE] = "VHOST_USER_NONE", + [VHOST_USER_GET_FEATURES] = "VHOST_USER_GET_FEATURES", + [VHOST_USER_SET_FEATURES] = "VHOST_USER_SET_FEATURES", + [VHOST_USER_SET_OWNER] = "VHOST_USER_SET_OWNER", + [VHOST_USER_RESET_OWNER] = "VHOST_USER_RESET_OWNER", + [VHOST_USER_SET_MEM_TABLE] = "VHOST_USER_SET_MEM_TABLE", + [VHOST_USER_SET_LOG_BASE] = "VHOST_USER_SET_LOG_BASE", + [VHOST_USER_SET_LOG_FD] = "VHOST_USER_SET_LOG_FD", + [VHOST_USER_SET_VRING_NUM] = "VHOST_USER_SET_VRING_NUM", + [VHOST_USER_SET_VRING_ADDR] = "VHOST_USER_SET_VRING_ADDR", + [VHOST_USER_SET_VRING_BASE] = "VHOST_USER_SET_VRING_BASE", + [VHOST_USER_GET_VRING_BASE] = "VHOST_USER_GET_VRING_BASE", + [VHOST_USER_SET_VRING_KICK] = "VHOST_USER_SET_VRING_KICK", + [VHOST_USER_SET_VRING_CALL] = "VHOST_USER_SET_VRING_CALL", + [VHOST_USER_SET_VRING_ERR] = "VHOST_USER_SET_VRING_ERR", + [VHOST_USER_GET_PROTOCOL_FEATURES] = "VHOST_USER_GET_PROTOCOL_FEATURES", + [VHOST_USER_SET_PROTOCOL_FEATURES] = "VHOST_USER_SET_PROTOCOL_FEATURES", + [VHOST_USER_GET_QUEUE_NUM] = "VHOST_USER_GET_QUEUE_NUM", + [VHOST_USER_SET_VRING_ENABLE] = "VHOST_USER_SET_VRING_ENABLE", + [VHOST_USER_SEND_RARP] = "VHOST_USER_SEND_RARP", + [VHOST_USER_NET_SET_MTU] = "VHOST_USER_NET_SET_MTU", +}; + +static uint64_t +get_blk_size(int fd) +{ + struct stat stat; + int ret; + + ret = fstat(fd, &stat); + return ret == -1 ? (uint64_t)-1 : (uint64_t)stat.st_blksize; +} + +static void +free_mem_region(struct virtio_net *dev) +{ + uint32_t i; + struct rte_vhost_mem_region *reg; + + if (!dev || !dev->mem) + return; + + for (i = 0; i < dev->mem->nregions; i++) { + reg = &dev->mem->regions[i]; + if (reg->host_user_addr) { + munmap(reg->mmap_addr, reg->mmap_size); + close(reg->fd); + } + } +} + +void +vhost_backend_cleanup(struct virtio_net *dev) +{ + if (dev->mem) { + free_mem_region(dev); + rte_free(dev->mem); + dev->mem = NULL; + } + if (dev->log_addr) { + munmap((void *)(uintptr_t)dev->log_addr, dev->log_size); + dev->log_addr = 0; + } +} + +/* + * This function just returns success at the moment unless + * the device hasn't been initialised. + */ +static int +vhost_user_set_owner(void) +{ + return 0; +} + +static int +vhost_user_reset_owner(struct virtio_net *dev) +{ + if (dev->flags & VIRTIO_DEV_RUNNING) { + dev->flags &= ~VIRTIO_DEV_RUNNING; + dev->notify_ops->destroy_device(dev->vid); + } + + cleanup_device(dev, 0); + reset_device(dev); + return 0; +} + +/* + * The features that we support are requested. + */ +static uint64_t +vhost_user_get_features(struct virtio_net *dev) +{ + uint64_t features = 0; + + rte_vhost_driver_get_features(dev->ifname, &features); + return features; +} + +/* + * We receive the negotiated features supported by us and the virtio device. + */ +static int +vhost_user_set_features(struct virtio_net *dev, uint64_t features) +{ + uint64_t vhost_features = 0; + + rte_vhost_driver_get_features(dev->ifname, &vhost_features); + if (features & ~vhost_features) + return -1; + + if ((dev->flags & VIRTIO_DEV_RUNNING) && dev->features != features) { + if (dev->notify_ops->features_changed) + dev->notify_ops->features_changed(dev->vid, features); + } + + dev->features = features; + if (dev->features & + ((1 << VIRTIO_NET_F_MRG_RXBUF) | (1ULL << VIRTIO_F_VERSION_1))) { + dev->vhost_hlen = sizeof(struct virtio_net_hdr_mrg_rxbuf); + } else { + dev->vhost_hlen = sizeof(struct virtio_net_hdr); + } + LOG_DEBUG(VHOST_CONFIG, + "(%d) mergeable RX buffers %s, virtio 1 %s\n", + dev->vid, + (dev->features & (1 << VIRTIO_NET_F_MRG_RXBUF)) ? "on" : "off", + (dev->features & (1ULL << VIRTIO_F_VERSION_1)) ? "on" : "off"); + + return 0; +} + +/* + * The virtio device sends us the size of the descriptor ring. + */ +static int +vhost_user_set_vring_num(struct virtio_net *dev, + struct vhost_vring_state *state) +{ + struct vhost_virtqueue *vq = dev->virtqueue[state->index]; + + vq->size = state->num; + + if (dev->dequeue_zero_copy) { + vq->nr_zmbuf = 0; + vq->last_zmbuf_idx = 0; + vq->zmbuf_size = vq->size; + vq->zmbufs = rte_zmalloc(NULL, vq->zmbuf_size * + sizeof(struct zcopy_mbuf), 0); + if (vq->zmbufs == NULL) { + RTE_LOG(WARNING, VHOST_CONFIG, + "failed to allocate mem for zero copy; " + "zero copy is force disabled\n"); + dev->dequeue_zero_copy = 0; + } + } + + vq->shadow_used_ring = rte_malloc(NULL, + vq->size * sizeof(struct vring_used_elem), + RTE_CACHE_LINE_SIZE); + if (!vq->shadow_used_ring) { + RTE_LOG(ERR, VHOST_CONFIG, + "failed to allocate memory for shadow used ring.\n"); + return -1; + } + + return 0; +} + +/* + * Reallocate virtio_dev and vhost_virtqueue data structure to make them on the + * same numa node as the memory of vring descriptor. + */ +#ifdef RTE_LIBRTE_VHOST_NUMA +static struct virtio_net* +numa_realloc(struct virtio_net *dev, int index) +{ + int oldnode, newnode; + struct virtio_net *old_dev; + struct vhost_virtqueue *old_vq, *vq; + int ret; + + enum {VIRTIO_RXQ, VIRTIO_TXQ, VIRTIO_QNUM}; + + old_dev = dev; + vq = old_vq = dev->virtqueue[index]; + + ret = get_mempolicy(&newnode, NULL, 0, old_vq->desc, + MPOL_F_NODE | MPOL_F_ADDR); + + /* check if we need to reallocate vq */ + ret |= get_mempolicy(&oldnode, NULL, 0, old_vq, + MPOL_F_NODE | MPOL_F_ADDR); + if (ret) { + RTE_LOG(ERR, VHOST_CONFIG, + "Unable to get vq numa information.\n"); + return dev; + } + if (oldnode != newnode) { + RTE_LOG(INFO, VHOST_CONFIG, + "reallocate vq from %d to %d node\n", oldnode, newnode); + vq = rte_malloc_socket(NULL, sizeof(*vq), 0, newnode); + if (!vq) + return dev; + + memcpy(vq, old_vq, sizeof(*vq) * VIRTIO_QNUM); + rte_free(old_vq); + } + + /* check if we need to reallocate dev */ + ret = get_mempolicy(&oldnode, NULL, 0, old_dev, + MPOL_F_NODE | MPOL_F_ADDR); + if (ret) { + RTE_LOG(ERR, VHOST_CONFIG, + "Unable to get dev numa information.\n"); + goto out; + } + if (oldnode != newnode) { + RTE_LOG(INFO, VHOST_CONFIG, + "reallocate dev from %d to %d node\n", + oldnode, newnode); + dev = rte_malloc_socket(NULL, sizeof(*dev), 0, newnode); + if (!dev) { + dev = old_dev; + goto out; + } + + memcpy(dev, old_dev, sizeof(*dev)); + rte_free(old_dev); + } + +out: + dev->virtqueue[index] = vq; + vhost_devices[dev->vid] = dev; + + return dev; +} +#else +static struct virtio_net* +numa_realloc(struct virtio_net *dev, int index __rte_unused) +{ + return dev; +} +#endif + +/* + * Converts QEMU virtual address to Vhost virtual address. This function is + * used to convert the ring addresses to our address space. + */ +static uint64_t +qva_to_vva(struct virtio_net *dev, uint64_t qva) +{ + struct rte_vhost_mem_region *reg; + uint32_t i; + + /* Find the region where the address lives. */ + for (i = 0; i < dev->mem->nregions; i++) { + reg = &dev->mem->regions[i]; + + if (qva >= reg->guest_user_addr && + qva < reg->guest_user_addr + reg->size) { + return qva - reg->guest_user_addr + + reg->host_user_addr; + } + } + + return 0; +} + +/* + * The virtio device sends us the desc, used and avail ring addresses. + * This function then converts these to our address space. + */ +static int +vhost_user_set_vring_addr(struct virtio_net *dev, struct vhost_vring_addr *addr) +{ + struct vhost_virtqueue *vq; + + if (dev->mem == NULL) + return -1; + + /* addr->index refers to the queue index. The txq 1, rxq is 0. */ + vq = dev->virtqueue[addr->index]; + + /* The addresses are converted from QEMU virtual to Vhost virtual. */ + vq->desc = (struct vring_desc *)(uintptr_t)qva_to_vva(dev, + addr->desc_user_addr); + if (vq->desc == 0) { + RTE_LOG(ERR, VHOST_CONFIG, + "(%d) failed to find desc ring address.\n", + dev->vid); + return -1; + } + + dev = numa_realloc(dev, addr->index); + vq = dev->virtqueue[addr->index]; + + vq->avail = (struct vring_avail *)(uintptr_t)qva_to_vva(dev, + addr->avail_user_addr); + if (vq->avail == 0) { + RTE_LOG(ERR, VHOST_CONFIG, + "(%d) failed to find avail ring address.\n", + dev->vid); + return -1; + } + + vq->used = (struct vring_used *)(uintptr_t)qva_to_vva(dev, + addr->used_user_addr); + if (vq->used == 0) { + RTE_LOG(ERR, VHOST_CONFIG, + "(%d) failed to find used ring address.\n", + dev->vid); + return -1; + } + + if (vq->last_used_idx != vq->used->idx) { + RTE_LOG(WARNING, VHOST_CONFIG, + "last_used_idx (%u) and vq->used->idx (%u) mismatches; " + "some packets maybe resent for Tx and dropped for Rx\n", + vq->last_used_idx, vq->used->idx); + vq->last_used_idx = vq->used->idx; + vq->last_avail_idx = vq->used->idx; + } + + vq->log_guest_addr = addr->log_guest_addr; + + LOG_DEBUG(VHOST_CONFIG, "(%d) mapped address desc: %p\n", + dev->vid, vq->desc); + LOG_DEBUG(VHOST_CONFIG, "(%d) mapped address avail: %p\n", + dev->vid, vq->avail); + LOG_DEBUG(VHOST_CONFIG, "(%d) mapped address used: %p\n", + dev->vid, vq->used); + LOG_DEBUG(VHOST_CONFIG, "(%d) log_guest_addr: %" PRIx64 "\n", + dev->vid, vq->log_guest_addr); + + return 0; +} + +/* + * The virtio device sends us the available ring last used index. + */ +static int +vhost_user_set_vring_base(struct virtio_net *dev, + struct vhost_vring_state *state) +{ + dev->virtqueue[state->index]->last_used_idx = state->num; + dev->virtqueue[state->index]->last_avail_idx = state->num; + + return 0; +} + +static void +add_one_guest_page(struct virtio_net *dev, uint64_t guest_phys_addr, + uint64_t host_phys_addr, uint64_t size) +{ + struct guest_page *page, *last_page; + + if (dev->nr_guest_pages == dev->max_guest_pages) { + dev->max_guest_pages *= 2; + dev->guest_pages = realloc(dev->guest_pages, + dev->max_guest_pages * sizeof(*page)); + } + + if (dev->nr_guest_pages > 0) { + last_page = &dev->guest_pages[dev->nr_guest_pages - 1]; + /* merge if the two pages are continuous */ + if (host_phys_addr == last_page->host_phys_addr + + last_page->size) { + last_page->size += size; + return; + } + } + + page = &dev->guest_pages[dev->nr_guest_pages++]; + page->guest_phys_addr = guest_phys_addr; + page->host_phys_addr = host_phys_addr; + page->size = size; +} + +static void +add_guest_pages(struct virtio_net *dev, struct rte_vhost_mem_region *reg, + uint64_t page_size) +{ + uint64_t reg_size = reg->size; + uint64_t host_user_addr = reg->host_user_addr; + uint64_t guest_phys_addr = reg->guest_phys_addr; + uint64_t host_phys_addr; + uint64_t size; + + host_phys_addr = rte_mem_virt2phy((void *)(uintptr_t)host_user_addr); + size = page_size - (guest_phys_addr & (page_size - 1)); + size = RTE_MIN(size, reg_size); + + add_one_guest_page(dev, guest_phys_addr, host_phys_addr, size); + host_user_addr += size; + guest_phys_addr += size; + reg_size -= size; + + while (reg_size > 0) { + size = RTE_MIN(reg_size, page_size); + host_phys_addr = rte_mem_virt2phy((void *)(uintptr_t) + host_user_addr); + add_one_guest_page(dev, guest_phys_addr, host_phys_addr, size); + + host_user_addr += size; + guest_phys_addr += size; + reg_size -= size; + } +} + +#ifdef RTE_LIBRTE_VHOST_DEBUG +/* TODO: enable it only in debug mode? */ +static void +dump_guest_pages(struct virtio_net *dev) +{ + uint32_t i; + struct guest_page *page; + + for (i = 0; i < dev->nr_guest_pages; i++) { + page = &dev->guest_pages[i]; + + RTE_LOG(INFO, VHOST_CONFIG, + "guest physical page region %u\n" + "\t guest_phys_addr: %" PRIx64 "\n" + "\t host_phys_addr : %" PRIx64 "\n" + "\t size : %" PRIx64 "\n", + i, + page->guest_phys_addr, + page->host_phys_addr, + page->size); + } +} +#else +#define dump_guest_pages(dev) +#endif + +static int +vhost_user_set_mem_table(struct virtio_net *dev, struct VhostUserMsg *pmsg) +{ + struct VhostUserMemory memory = pmsg->payload.memory; + struct rte_vhost_mem_region *reg; + void *mmap_addr; + uint64_t mmap_size; + uint64_t mmap_offset; + uint64_t alignment; + uint32_t i; + int fd; + + if (dev->mem) { + free_mem_region(dev); + rte_free(dev->mem); + dev->mem = NULL; + } + + dev->nr_guest_pages = 0; + if (!dev->guest_pages) { + dev->max_guest_pages = 8; + dev->guest_pages = malloc(dev->max_guest_pages * + sizeof(struct guest_page)); + } + + dev->mem = rte_zmalloc("vhost-mem-table", sizeof(struct rte_vhost_memory) + + sizeof(struct rte_vhost_mem_region) * memory.nregions, 0); + if (dev->mem == NULL) { + RTE_LOG(ERR, VHOST_CONFIG, + "(%d) failed to allocate memory for dev->mem\n", + dev->vid); + return -1; + } + dev->mem->nregions = memory.nregions; + + for (i = 0; i < memory.nregions; i++) { + fd = pmsg->fds[i]; + reg = &dev->mem->regions[i]; + + reg->guest_phys_addr = memory.regions[i].guest_phys_addr; + reg->guest_user_addr = memory.regions[i].userspace_addr; + reg->size = memory.regions[i].memory_size; + reg->fd = fd; + + mmap_offset = memory.regions[i].mmap_offset; + mmap_size = reg->size + mmap_offset; + + /* mmap() without flag of MAP_ANONYMOUS, should be called + * with length argument aligned with hugepagesz at older + * longterm version Linux, like 2.6.32 and 3.2.72, or + * mmap() will fail with EINVAL. + * + * to avoid failure, make sure in caller to keep length + * aligned. + */ + alignment = get_blk_size(fd); + if (alignment == (uint64_t)-1) { + RTE_LOG(ERR, VHOST_CONFIG, + "couldn't get hugepage size through fstat\n"); + goto err_mmap; + } + mmap_size = RTE_ALIGN_CEIL(mmap_size, alignment); + + mmap_addr = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE, + MAP_SHARED | MAP_POPULATE, fd, 0); + + if (mmap_addr == MAP_FAILED) { + RTE_LOG(ERR, VHOST_CONFIG, + "mmap region %u failed.\n", i); + goto err_mmap; + } + + reg->mmap_addr = mmap_addr; + reg->mmap_size = mmap_size; + reg->host_user_addr = (uint64_t)(uintptr_t)mmap_addr + + mmap_offset; + + if (dev->dequeue_zero_copy) + add_guest_pages(dev, reg, alignment); + + RTE_LOG(INFO, VHOST_CONFIG, + "guest memory region %u, size: 0x%" PRIx64 "\n" + "\t guest physical addr: 0x%" PRIx64 "\n" + "\t guest virtual addr: 0x%" PRIx64 "\n" + "\t host virtual addr: 0x%" PRIx64 "\n" + "\t mmap addr : 0x%" PRIx64 "\n" + "\t mmap size : 0x%" PRIx64 "\n" + "\t mmap align: 0x%" PRIx64 "\n" + "\t mmap off : 0x%" PRIx64 "\n", + i, reg->size, + reg->guest_phys_addr, + reg->guest_user_addr, + reg->host_user_addr, + (uint64_t)(uintptr_t)mmap_addr, + mmap_size, + alignment, + mmap_offset); + } + + dump_guest_pages(dev); + + return 0; + +err_mmap: + free_mem_region(dev); + rte_free(dev->mem); + dev->mem = NULL; + return -1; +} + +static int +vq_is_ready(struct vhost_virtqueue *vq) +{ + return vq && vq->desc && + vq->kickfd != VIRTIO_UNINITIALIZED_EVENTFD && + vq->callfd != VIRTIO_UNINITIALIZED_EVENTFD; +} + +static int +virtio_is_ready(struct virtio_net *dev) +{ + struct vhost_virtqueue *vq; + uint32_t i; + + if (dev->nr_vring == 0) + return 0; + + for (i = 0; i < dev->nr_vring; i++) { + vq = dev->virtqueue[i]; + + if (!vq_is_ready(vq)) + return 0; + } + + RTE_LOG(INFO, VHOST_CONFIG, + "virtio is now ready for processing.\n"); + return 1; +} + +static void +vhost_user_set_vring_call(struct virtio_net *dev, struct VhostUserMsg *pmsg) +{ + struct vhost_vring_file file; + struct vhost_virtqueue *vq; + + file.index = pmsg->payload.u64 & VHOST_USER_VRING_IDX_MASK; + if (pmsg->payload.u64 & VHOST_USER_VRING_NOFD_MASK) + file.fd = VIRTIO_INVALID_EVENTFD; + else + file.fd = pmsg->fds[0]; + RTE_LOG(INFO, VHOST_CONFIG, + "vring call idx:%d file:%d\n", file.index, file.fd); + + vq = dev->virtqueue[file.index]; + if (vq->callfd >= 0) + close(vq->callfd); + + vq->callfd = file.fd; +} + +static void +vhost_user_set_vring_kick(struct virtio_net *dev, struct VhostUserMsg *pmsg) +{ + struct vhost_vring_file file; + struct vhost_virtqueue *vq; + + file.index = pmsg->payload.u64 & VHOST_USER_VRING_IDX_MASK; + if (pmsg->payload.u64 & VHOST_USER_VRING_NOFD_MASK) + file.fd = VIRTIO_INVALID_EVENTFD; + else + file.fd = pmsg->fds[0]; + RTE_LOG(INFO, VHOST_CONFIG, + "vring kick idx:%d file:%d\n", file.index, file.fd); + + vq = dev->virtqueue[file.index]; + if (vq->kickfd >= 0) + close(vq->kickfd); + vq->kickfd = file.fd; +} + +static void +free_zmbufs(struct vhost_virtqueue *vq) +{ + struct zcopy_mbuf *zmbuf, *next; + + for (zmbuf = TAILQ_FIRST(&vq->zmbuf_list); + zmbuf != NULL; zmbuf = next) { + next = TAILQ_NEXT(zmbuf, next); + + rte_pktmbuf_free(zmbuf->mbuf); + TAILQ_REMOVE(&vq->zmbuf_list, zmbuf, next); + } + + rte_free(vq->zmbufs); +} + +/* + * when virtio is stopped, qemu will send us the GET_VRING_BASE message. + */ +static int +vhost_user_get_vring_base(struct virtio_net *dev, + struct vhost_vring_state *state) +{ + struct vhost_virtqueue *vq = dev->virtqueue[state->index]; + + /* We have to stop the queue (virtio) if it is running. */ + if (dev->flags & VIRTIO_DEV_RUNNING) { + dev->flags &= ~VIRTIO_DEV_RUNNING; + dev->notify_ops->destroy_device(dev->vid); + } + + dev->flags &= ~VIRTIO_DEV_READY; + + /* Here we are safe to get the last used index */ + state->num = vq->last_used_idx; + + RTE_LOG(INFO, VHOST_CONFIG, + "vring base idx:%d file:%d\n", state->index, state->num); + /* + * Based on current qemu vhost-user implementation, this message is + * sent and only sent in vhost_vring_stop. + * TODO: cleanup the vring, it isn't usable since here. + */ + if (vq->kickfd >= 0) + close(vq->kickfd); + + vq->kickfd = VIRTIO_UNINITIALIZED_EVENTFD; + + if (dev->dequeue_zero_copy) + free_zmbufs(vq); + rte_free(vq->shadow_used_ring); + vq->shadow_used_ring = NULL; + + return 0; +} + +/* + * when virtio queues are ready to work, qemu will send us to + * enable the virtio queue pair. + */ +static int +vhost_user_set_vring_enable(struct virtio_net *dev, + struct vhost_vring_state *state) +{ + int enable = (int)state->num; + + RTE_LOG(INFO, VHOST_CONFIG, + "set queue enable: %d to qp idx: %d\n", + enable, state->index); + + if (dev->notify_ops->vring_state_changed) + dev->notify_ops->vring_state_changed(dev->vid, state->index, enable); + + dev->virtqueue[state->index]->enabled = enable; + + return 0; +} + +static void +vhost_user_set_protocol_features(struct virtio_net *dev, + uint64_t protocol_features) +{ + if (protocol_features & ~VHOST_USER_PROTOCOL_FEATURES) + return; + + dev->protocol_features = protocol_features; +} + +static int +vhost_user_set_log_base(struct virtio_net *dev, struct VhostUserMsg *msg) +{ + int fd = msg->fds[0]; + uint64_t size, off; + void *addr; + + if (fd < 0) { + RTE_LOG(ERR, VHOST_CONFIG, "invalid log fd: %d\n", fd); + return -1; + } + + if (msg->size != sizeof(VhostUserLog)) { + RTE_LOG(ERR, VHOST_CONFIG, + "invalid log base msg size: %"PRId32" != %d\n", + msg->size, (int)sizeof(VhostUserLog)); + return -1; + } + + size = msg->payload.log.mmap_size; + off = msg->payload.log.mmap_offset; + RTE_LOG(INFO, VHOST_CONFIG, + "log mmap size: %"PRId64", offset: %"PRId64"\n", + size, off); + + /* + * mmap from 0 to workaround a hugepage mmap bug: mmap will + * fail when offset is not page size aligned. + */ + addr = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); + close(fd); + if (addr == MAP_FAILED) { + RTE_LOG(ERR, VHOST_CONFIG, "mmap log base failed!\n"); + return -1; + } + + /* + * Free previously mapped log memory on occasionally + * multiple VHOST_USER_SET_LOG_BASE. + */ + if (dev->log_addr) { + munmap((void *)(uintptr_t)dev->log_addr, dev->log_size); + } + dev->log_addr = (uint64_t)(uintptr_t)addr; + dev->log_base = dev->log_addr + off; + dev->log_size = size; + + return 0; +} + +/* + * An rarp packet is constructed and broadcasted to notify switches about + * the new location of the migrated VM, so that packets from outside will + * not be lost after migration. + * + * However, we don't actually "send" a rarp packet here, instead, we set + * a flag 'broadcast_rarp' to let rte_vhost_dequeue_burst() inject it. + */ +static int +vhost_user_send_rarp(struct virtio_net *dev, struct VhostUserMsg *msg) +{ + uint8_t *mac = (uint8_t *)&msg->payload.u64; + + RTE_LOG(DEBUG, VHOST_CONFIG, + ":: mac: %02x:%02x:%02x:%02x:%02x:%02x\n", + mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]); + memcpy(dev->mac.addr_bytes, mac, 6); + + /* + * Set the flag to inject a RARP broadcast packet at + * rte_vhost_dequeue_burst(). + * + * rte_smp_wmb() is for making sure the mac is copied + * before the flag is set. + */ + rte_smp_wmb(); + rte_atomic16_set(&dev->broadcast_rarp, 1); + + return 0; +} + +static int +vhost_user_net_set_mtu(struct virtio_net *dev, struct VhostUserMsg *msg) +{ + if (msg->payload.u64 < VIRTIO_MIN_MTU || + msg->payload.u64 > VIRTIO_MAX_MTU) { + RTE_LOG(ERR, VHOST_CONFIG, "Invalid MTU size (%"PRIu64")\n", + msg->payload.u64); + + return -1; + } + + dev->mtu = msg->payload.u64; + + return 0; +} + +/* return bytes# of read on success or negative val on failure. */ +static int +read_vhost_message(int sockfd, struct VhostUserMsg *msg) +{ + int ret; + + ret = read_fd_message(sockfd, (char *)msg, VHOST_USER_HDR_SIZE, + msg->fds, VHOST_MEMORY_MAX_NREGIONS); + if (ret <= 0) + return ret; + + if (msg && msg->size) { + if (msg->size > sizeof(msg->payload)) { + RTE_LOG(ERR, VHOST_CONFIG, + "invalid msg size: %d\n", msg->size); + return -1; + } + ret = read(sockfd, &msg->payload, msg->size); + if (ret <= 0) + return ret; + if (ret != (int)msg->size) { + RTE_LOG(ERR, VHOST_CONFIG, + "read control message failed\n"); + return -1; + } + } + + return ret; +} + +static int +send_vhost_message(int sockfd, struct VhostUserMsg *msg) +{ + int ret; + + if (!msg) + return 0; + + msg->flags &= ~VHOST_USER_VERSION_MASK; + msg->flags &= ~VHOST_USER_NEED_REPLY; + msg->flags |= VHOST_USER_VERSION; + msg->flags |= VHOST_USER_REPLY_MASK; + + ret = send_fd_message(sockfd, (char *)msg, + VHOST_USER_HDR_SIZE + msg->size, NULL, 0); + + return ret; +} + +/* + * Allocate a queue pair if it hasn't been allocated yet + */ +static int +vhost_user_check_and_alloc_queue_pair(struct virtio_net *dev, VhostUserMsg *msg) +{ + uint16_t vring_idx; + + switch (msg->request) { + case VHOST_USER_SET_VRING_KICK: + case VHOST_USER_SET_VRING_CALL: + case VHOST_USER_SET_VRING_ERR: + vring_idx = msg->payload.u64 & VHOST_USER_VRING_IDX_MASK; + break; + case VHOST_USER_SET_VRING_NUM: + case VHOST_USER_SET_VRING_BASE: + case VHOST_USER_SET_VRING_ENABLE: + vring_idx = msg->payload.state.index; + break; + case VHOST_USER_SET_VRING_ADDR: + vring_idx = msg->payload.addr.index; + break; + default: + return 0; + } + + if (vring_idx >= VHOST_MAX_VRING) { + RTE_LOG(ERR, VHOST_CONFIG, + "invalid vring index: %u\n", vring_idx); + return -1; + } + + if (dev->virtqueue[vring_idx]) + return 0; + + return alloc_vring_queue(dev, vring_idx); +} + +int +vhost_user_msg_handler(int vid, int fd) +{ + struct virtio_net *dev; + struct VhostUserMsg msg; + int ret; + + dev = get_device(vid); + if (dev == NULL) + return -1; + + if (!dev->notify_ops) { + dev->notify_ops = vhost_driver_callback_get(dev->ifname); + if (!dev->notify_ops) { + RTE_LOG(ERR, VHOST_CONFIG, + "failed to get callback ops for driver %s\n", + dev->ifname); + return -1; + } + } + + ret = read_vhost_message(fd, &msg); + if (ret <= 0 || msg.request >= VHOST_USER_MAX) { + if (ret < 0) + RTE_LOG(ERR, VHOST_CONFIG, + "vhost read message failed\n"); + else if (ret == 0) + RTE_LOG(INFO, VHOST_CONFIG, + "vhost peer closed\n"); + else + RTE_LOG(ERR, VHOST_CONFIG, + "vhost read incorrect message\n"); + + return -1; + } + + ret = 0; + RTE_LOG(INFO, VHOST_CONFIG, "read message %s\n", + vhost_message_str[msg.request]); + + ret = vhost_user_check_and_alloc_queue_pair(dev, &msg); + if (ret < 0) { + RTE_LOG(ERR, VHOST_CONFIG, + "failed to alloc queue\n"); + return -1; + } + + switch (msg.request) { + case VHOST_USER_GET_FEATURES: + msg.payload.u64 = vhost_user_get_features(dev); + msg.size = sizeof(msg.payload.u64); + send_vhost_message(fd, &msg); + break; + case VHOST_USER_SET_FEATURES: + vhost_user_set_features(dev, msg.payload.u64); + break; + + case VHOST_USER_GET_PROTOCOL_FEATURES: + msg.payload.u64 = VHOST_USER_PROTOCOL_FEATURES; + msg.size = sizeof(msg.payload.u64); + send_vhost_message(fd, &msg); + break; + case VHOST_USER_SET_PROTOCOL_FEATURES: + vhost_user_set_protocol_features(dev, msg.payload.u64); + break; + + case VHOST_USER_SET_OWNER: + vhost_user_set_owner(); + break; + case VHOST_USER_RESET_OWNER: + vhost_user_reset_owner(dev); + break; + + case VHOST_USER_SET_MEM_TABLE: + ret = vhost_user_set_mem_table(dev, &msg); + break; + + case VHOST_USER_SET_LOG_BASE: + vhost_user_set_log_base(dev, &msg); + + /* it needs a reply */ + msg.size = sizeof(msg.payload.u64); + send_vhost_message(fd, &msg); + break; + case VHOST_USER_SET_LOG_FD: + close(msg.fds[0]); + RTE_LOG(INFO, VHOST_CONFIG, "not implemented.\n"); + break; + + case VHOST_USER_SET_VRING_NUM: + vhost_user_set_vring_num(dev, &msg.payload.state); + break; + case VHOST_USER_SET_VRING_ADDR: + vhost_user_set_vring_addr(dev, &msg.payload.addr); + break; + case VHOST_USER_SET_VRING_BASE: + vhost_user_set_vring_base(dev, &msg.payload.state); + break; + + case VHOST_USER_GET_VRING_BASE: + vhost_user_get_vring_base(dev, &msg.payload.state); + msg.size = sizeof(msg.payload.state); + send_vhost_message(fd, &msg); + break; + + case VHOST_USER_SET_VRING_KICK: + vhost_user_set_vring_kick(dev, &msg); + break; + case VHOST_USER_SET_VRING_CALL: + vhost_user_set_vring_call(dev, &msg); + break; + + case VHOST_USER_SET_VRING_ERR: + if (!(msg.payload.u64 & VHOST_USER_VRING_NOFD_MASK)) + close(msg.fds[0]); + RTE_LOG(INFO, VHOST_CONFIG, "not implemented\n"); + break; + + case VHOST_USER_GET_QUEUE_NUM: + msg.payload.u64 = VHOST_MAX_QUEUE_PAIRS; + msg.size = sizeof(msg.payload.u64); + send_vhost_message(fd, &msg); + break; + + case VHOST_USER_SET_VRING_ENABLE: + vhost_user_set_vring_enable(dev, &msg.payload.state); + break; + case VHOST_USER_SEND_RARP: + vhost_user_send_rarp(dev, &msg); + break; + + case VHOST_USER_NET_SET_MTU: + ret = vhost_user_net_set_mtu(dev, &msg); + break; + + default: + ret = -1; + break; + + } + + if (msg.flags & VHOST_USER_NEED_REPLY) { + msg.payload.u64 = !!ret; + msg.size = sizeof(msg.payload.u64); + send_vhost_message(fd, &msg); + } + + if (!(dev->flags & VIRTIO_DEV_RUNNING) && virtio_is_ready(dev)) { + dev->flags |= VIRTIO_DEV_READY; + + if (!(dev->flags & VIRTIO_DEV_RUNNING)) { + if (dev->dequeue_zero_copy) { + RTE_LOG(INFO, VHOST_CONFIG, + "dequeue zero copy is enabled\n"); + } + + if (dev->notify_ops->new_device(dev->vid) == 0) + dev->flags |= VIRTIO_DEV_RUNNING; + } + } + + return 0; +} diff --git a/src/seastar/dpdk/lib/librte_vhost/vhost_user.h b/src/seastar/dpdk/lib/librte_vhost/vhost_user.h new file mode 100644 index 00000000..35ebd719 --- /dev/null +++ b/src/seastar/dpdk/lib/librte_vhost/vhost_user.h @@ -0,0 +1,138 @@ +/*- + * 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. + */ + +#ifndef _VHOST_NET_USER_H +#define _VHOST_NET_USER_H + +#include <stdint.h> +#include <linux/vhost.h> + +#include "rte_vhost.h" + +/* refer to hw/virtio/vhost-user.c */ + +#define VHOST_MEMORY_MAX_NREGIONS 8 + +#define VHOST_USER_PROTOCOL_F_MQ 0 +#define VHOST_USER_PROTOCOL_F_LOG_SHMFD 1 +#define VHOST_USER_PROTOCOL_F_RARP 2 +#define VHOST_USER_PROTOCOL_F_REPLY_ACK 3 +#define VHOST_USER_PROTOCOL_F_NET_MTU 4 + +/* + * disable REPLY_ACK feature to workaround the buggy QEMU implementation. + * Proved buggy QEMU includes v2.7 - v2.9. + */ +#define VHOST_USER_PROTOCOL_FEATURES ((1ULL << VHOST_USER_PROTOCOL_F_MQ) | \ + (1ULL << VHOST_USER_PROTOCOL_F_LOG_SHMFD) |\ + (1ULL << VHOST_USER_PROTOCOL_F_RARP) | \ + (0ULL << VHOST_USER_PROTOCOL_F_REPLY_ACK) | \ + (1ULL << VHOST_USER_PROTOCOL_F_NET_MTU)) + +typedef enum VhostUserRequest { + 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_SEND_RARP = 19, + VHOST_USER_NET_SET_MTU = 20, + VHOST_USER_MAX +} VhostUserRequest; + +typedef struct VhostUserMemoryRegion { + uint64_t guest_phys_addr; + uint64_t memory_size; + uint64_t userspace_addr; + uint64_t mmap_offset; +} VhostUserMemoryRegion; + +typedef struct VhostUserMemory { + uint32_t nregions; + uint32_t padding; + VhostUserMemoryRegion regions[VHOST_MEMORY_MAX_NREGIONS]; +} VhostUserMemory; + +typedef struct VhostUserLog { + uint64_t mmap_size; + uint64_t mmap_offset; +} VhostUserLog; + +typedef struct VhostUserMsg { + VhostUserRequest request; + +#define VHOST_USER_VERSION_MASK 0x3 +#define VHOST_USER_REPLY_MASK (0x1 << 2) +#define VHOST_USER_NEED_REPLY (0x1 << 3) + 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; + VhostUserMemory memory; + VhostUserLog log; + } payload; + int fds[VHOST_MEMORY_MAX_NREGIONS]; +} __attribute((packed)) VhostUserMsg; + +#define VHOST_USER_HDR_SIZE offsetof(VhostUserMsg, payload.u64) + +/* The version of the protocol we support */ +#define VHOST_USER_VERSION 0x1 + + +/* vhost_user.c */ +int vhost_user_msg_handler(int vid, int fd); + +/* socket.c */ +int read_fd_message(int sockfd, char *buf, int buflen, int *fds, int fd_num); +int send_fd_message(int sockfd, char *buf, int buflen, int *fds, int fd_num); + +#endif diff --git a/src/seastar/dpdk/lib/librte_vhost/virtio_net.c b/src/seastar/dpdk/lib/librte_vhost/virtio_net.c new file mode 100644 index 00000000..48219e05 --- /dev/null +++ b/src/seastar/dpdk/lib/librte_vhost/virtio_net.c @@ -0,0 +1,1171 @@ +/*- + * 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 <stdbool.h> +#include <linux/virtio_net.h> + +#include <rte_mbuf.h> +#include <rte_memcpy.h> +#include <rte_ether.h> +#include <rte_ip.h> +#include <rte_vhost.h> +#include <rte_tcp.h> +#include <rte_udp.h> +#include <rte_sctp.h> +#include <rte_arp.h> + +#include "vhost.h" + +#define MAX_PKT_BURST 32 + +static bool +is_valid_virt_queue_idx(uint32_t idx, int is_tx, uint32_t nr_vring) +{ + return (is_tx ^ (idx & 1)) == 0 && idx < nr_vring; +} + +static inline void __attribute__((always_inline)) +do_flush_shadow_used_ring(struct virtio_net *dev, struct vhost_virtqueue *vq, + uint16_t to, uint16_t from, uint16_t size) +{ + rte_memcpy(&vq->used->ring[to], + &vq->shadow_used_ring[from], + size * sizeof(struct vring_used_elem)); + vhost_log_used_vring(dev, vq, + offsetof(struct vring_used, ring[to]), + size * sizeof(struct vring_used_elem)); +} + +static inline void __attribute__((always_inline)) +flush_shadow_used_ring(struct virtio_net *dev, struct vhost_virtqueue *vq) +{ + uint16_t used_idx = vq->last_used_idx & (vq->size - 1); + + if (used_idx + vq->shadow_used_idx <= vq->size) { + do_flush_shadow_used_ring(dev, vq, used_idx, 0, + vq->shadow_used_idx); + } else { + uint16_t size; + + /* update used ring interval [used_idx, vq->size] */ + size = vq->size - used_idx; + do_flush_shadow_used_ring(dev, vq, used_idx, 0, size); + + /* update the left half used ring interval [0, left_size] */ + do_flush_shadow_used_ring(dev, vq, 0, size, + vq->shadow_used_idx - size); + } + vq->last_used_idx += vq->shadow_used_idx; + + rte_smp_wmb(); + + *(volatile uint16_t *)&vq->used->idx += vq->shadow_used_idx; + vhost_log_used_vring(dev, vq, offsetof(struct vring_used, idx), + sizeof(vq->used->idx)); +} + +static inline void __attribute__((always_inline)) +update_shadow_used_ring(struct vhost_virtqueue *vq, + uint16_t desc_idx, uint16_t len) +{ + uint16_t i = vq->shadow_used_idx++; + + vq->shadow_used_ring[i].id = desc_idx; + vq->shadow_used_ring[i].len = len; +} + +/* avoid write operation when necessary, to lessen cache issues */ +#define ASSIGN_UNLESS_EQUAL(var, val) do { \ + if ((var) != (val)) \ + (var) = (val); \ +} while (0) + +static void +virtio_enqueue_offload(struct rte_mbuf *m_buf, struct virtio_net_hdr *net_hdr) +{ + if (m_buf->ol_flags & PKT_TX_L4_MASK) { + net_hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; + net_hdr->csum_start = m_buf->l2_len + m_buf->l3_len; + + switch (m_buf->ol_flags & PKT_TX_L4_MASK) { + case PKT_TX_TCP_CKSUM: + net_hdr->csum_offset = (offsetof(struct tcp_hdr, + cksum)); + break; + case PKT_TX_UDP_CKSUM: + net_hdr->csum_offset = (offsetof(struct udp_hdr, + dgram_cksum)); + break; + case PKT_TX_SCTP_CKSUM: + net_hdr->csum_offset = (offsetof(struct sctp_hdr, + cksum)); + break; + } + } else { + ASSIGN_UNLESS_EQUAL(net_hdr->csum_start, 0); + ASSIGN_UNLESS_EQUAL(net_hdr->csum_offset, 0); + ASSIGN_UNLESS_EQUAL(net_hdr->flags, 0); + } + + if (m_buf->ol_flags & PKT_TX_TCP_SEG) { + if (m_buf->ol_flags & PKT_TX_IPV4) + net_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4; + else + net_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6; + net_hdr->gso_size = m_buf->tso_segsz; + net_hdr->hdr_len = m_buf->l2_len + m_buf->l3_len + + m_buf->l4_len; + } else { + ASSIGN_UNLESS_EQUAL(net_hdr->gso_type, 0); + ASSIGN_UNLESS_EQUAL(net_hdr->gso_size, 0); + ASSIGN_UNLESS_EQUAL(net_hdr->hdr_len, 0); + } +} + +static inline int __attribute__((always_inline)) +copy_mbuf_to_desc(struct virtio_net *dev, struct vring_desc *descs, + struct rte_mbuf *m, uint16_t desc_idx, uint32_t size) +{ + uint32_t desc_avail, desc_offset; + uint32_t mbuf_avail, mbuf_offset; + uint32_t cpy_len; + struct vring_desc *desc; + uint64_t desc_addr; + /* A counter to avoid desc dead loop chain */ + uint16_t nr_desc = 1; + + desc = &descs[desc_idx]; + desc_addr = rte_vhost_gpa_to_vva(dev->mem, desc->addr); + /* + * Checking of 'desc_addr' placed outside of 'unlikely' macro to avoid + * performance issue with some versions of gcc (4.8.4 and 5.3.0) which + * otherwise stores offset on the stack instead of in a register. + */ + if (unlikely(desc->len < dev->vhost_hlen) || !desc_addr) + return -1; + + rte_prefetch0((void *)(uintptr_t)desc_addr); + + virtio_enqueue_offload(m, (struct virtio_net_hdr *)(uintptr_t)desc_addr); + vhost_log_write(dev, desc->addr, dev->vhost_hlen); + PRINT_PACKET(dev, (uintptr_t)desc_addr, dev->vhost_hlen, 0); + + desc_offset = dev->vhost_hlen; + desc_avail = desc->len - dev->vhost_hlen; + + mbuf_avail = rte_pktmbuf_data_len(m); + mbuf_offset = 0; + while (mbuf_avail != 0 || m->next != NULL) { + /* done with current mbuf, fetch next */ + if (mbuf_avail == 0) { + m = m->next; + + mbuf_offset = 0; + mbuf_avail = rte_pktmbuf_data_len(m); + } + + /* done with current desc buf, fetch next */ + if (desc_avail == 0) { + if ((desc->flags & VRING_DESC_F_NEXT) == 0) { + /* Room in vring buffer is not enough */ + return -1; + } + if (unlikely(desc->next >= size || ++nr_desc > size)) + return -1; + + desc = &descs[desc->next]; + desc_addr = rte_vhost_gpa_to_vva(dev->mem, desc->addr); + if (unlikely(!desc_addr)) + return -1; + + desc_offset = 0; + desc_avail = desc->len; + } + + cpy_len = RTE_MIN(desc_avail, mbuf_avail); + rte_memcpy((void *)((uintptr_t)(desc_addr + desc_offset)), + rte_pktmbuf_mtod_offset(m, void *, mbuf_offset), + cpy_len); + vhost_log_write(dev, desc->addr + desc_offset, cpy_len); + PRINT_PACKET(dev, (uintptr_t)(desc_addr + desc_offset), + cpy_len, 0); + + mbuf_avail -= cpy_len; + mbuf_offset += cpy_len; + desc_avail -= cpy_len; + desc_offset += cpy_len; + } + + return 0; +} + +/** + * This function adds buffers to the virtio devices RX virtqueue. Buffers can + * be received from the physical port or from another virtio device. A packet + * count is returned to indicate the number of packets that are succesfully + * added to the RX queue. This function works when the mbuf is scattered, but + * it doesn't support the mergeable feature. + */ +static inline uint32_t __attribute__((always_inline)) +virtio_dev_rx(struct virtio_net *dev, uint16_t queue_id, + struct rte_mbuf **pkts, uint32_t count) +{ + struct vhost_virtqueue *vq; + uint16_t avail_idx, free_entries, start_idx; + uint16_t desc_indexes[MAX_PKT_BURST]; + struct vring_desc *descs; + uint16_t used_idx; + uint32_t i, sz; + + LOG_DEBUG(VHOST_DATA, "(%d) %s\n", dev->vid, __func__); + if (unlikely(!is_valid_virt_queue_idx(queue_id, 0, dev->nr_vring))) { + RTE_LOG(ERR, VHOST_DATA, "(%d) %s: invalid virtqueue idx %d.\n", + dev->vid, __func__, queue_id); + return 0; + } + + vq = dev->virtqueue[queue_id]; + if (unlikely(vq->enabled == 0)) + return 0; + + avail_idx = *((volatile uint16_t *)&vq->avail->idx); + start_idx = vq->last_used_idx; + free_entries = avail_idx - start_idx; + count = RTE_MIN(count, free_entries); + count = RTE_MIN(count, (uint32_t)MAX_PKT_BURST); + if (count == 0) + return 0; + + LOG_DEBUG(VHOST_DATA, "(%d) start_idx %d | end_idx %d\n", + dev->vid, start_idx, start_idx + count); + + /* Retrieve all of the desc indexes first to avoid caching issues. */ + rte_prefetch0(&vq->avail->ring[start_idx & (vq->size - 1)]); + for (i = 0; i < count; i++) { + used_idx = (start_idx + i) & (vq->size - 1); + desc_indexes[i] = vq->avail->ring[used_idx]; + vq->used->ring[used_idx].id = desc_indexes[i]; + vq->used->ring[used_idx].len = pkts[i]->pkt_len + + dev->vhost_hlen; + vhost_log_used_vring(dev, vq, + offsetof(struct vring_used, ring[used_idx]), + sizeof(vq->used->ring[used_idx])); + } + + rte_prefetch0(&vq->desc[desc_indexes[0]]); + for (i = 0; i < count; i++) { + uint16_t desc_idx = desc_indexes[i]; + int err; + + if (vq->desc[desc_idx].flags & VRING_DESC_F_INDIRECT) { + descs = (struct vring_desc *)(uintptr_t) + rte_vhost_gpa_to_vva(dev->mem, + vq->desc[desc_idx].addr); + if (unlikely(!descs)) { + count = i; + break; + } + + desc_idx = 0; + sz = vq->desc[desc_idx].len / sizeof(*descs); + } else { + descs = vq->desc; + sz = vq->size; + } + + err = copy_mbuf_to_desc(dev, descs, pkts[i], desc_idx, sz); + if (unlikely(err)) { + used_idx = (start_idx + i) & (vq->size - 1); + vq->used->ring[used_idx].len = dev->vhost_hlen; + vhost_log_used_vring(dev, vq, + offsetof(struct vring_used, ring[used_idx]), + sizeof(vq->used->ring[used_idx])); + } + + if (i + 1 < count) + rte_prefetch0(&vq->desc[desc_indexes[i+1]]); + } + + rte_smp_wmb(); + + *(volatile uint16_t *)&vq->used->idx += count; + vq->last_used_idx += count; + vhost_log_used_vring(dev, vq, + offsetof(struct vring_used, idx), + sizeof(vq->used->idx)); + + /* flush used->idx update before we read avail->flags. */ + rte_mb(); + + /* Kick the guest if necessary. */ + if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT) + && (vq->callfd >= 0)) + eventfd_write(vq->callfd, (eventfd_t)1); + return count; +} + +static inline int __attribute__((always_inline)) +fill_vec_buf(struct virtio_net *dev, struct vhost_virtqueue *vq, + uint32_t avail_idx, uint32_t *vec_idx, + struct buf_vector *buf_vec, uint16_t *desc_chain_head, + uint16_t *desc_chain_len) +{ + uint16_t idx = vq->avail->ring[avail_idx & (vq->size - 1)]; + uint32_t vec_id = *vec_idx; + uint32_t len = 0; + struct vring_desc *descs = vq->desc; + + *desc_chain_head = idx; + + if (vq->desc[idx].flags & VRING_DESC_F_INDIRECT) { + descs = (struct vring_desc *)(uintptr_t) + rte_vhost_gpa_to_vva(dev->mem, vq->desc[idx].addr); + if (unlikely(!descs)) + return -1; + + idx = 0; + } + + while (1) { + if (unlikely(vec_id >= BUF_VECTOR_MAX || idx >= vq->size)) + return -1; + + len += descs[idx].len; + buf_vec[vec_id].buf_addr = descs[idx].addr; + buf_vec[vec_id].buf_len = descs[idx].len; + buf_vec[vec_id].desc_idx = idx; + vec_id++; + + if ((descs[idx].flags & VRING_DESC_F_NEXT) == 0) + break; + + idx = descs[idx].next; + } + + *desc_chain_len = len; + *vec_idx = vec_id; + + return 0; +} + +/* + * Returns -1 on fail, 0 on success + */ +static inline int +reserve_avail_buf_mergeable(struct virtio_net *dev, struct vhost_virtqueue *vq, + uint32_t size, struct buf_vector *buf_vec, + uint16_t *num_buffers, uint16_t avail_head) +{ + uint16_t cur_idx; + uint32_t vec_idx = 0; + uint16_t tries = 0; + + uint16_t head_idx = 0; + uint16_t len = 0; + + *num_buffers = 0; + cur_idx = vq->last_avail_idx; + + while (size > 0) { + if (unlikely(cur_idx == avail_head)) + return -1; + + if (unlikely(fill_vec_buf(dev, vq, cur_idx, &vec_idx, buf_vec, + &head_idx, &len) < 0)) + return -1; + len = RTE_MIN(len, size); + update_shadow_used_ring(vq, head_idx, len); + size -= len; + + cur_idx++; + tries++; + *num_buffers += 1; + + /* + * if we tried all available ring items, and still + * can't get enough buf, it means something abnormal + * happened. + */ + if (unlikely(tries >= vq->size)) + return -1; + } + + return 0; +} + +static inline int __attribute__((always_inline)) +copy_mbuf_to_desc_mergeable(struct virtio_net *dev, struct rte_mbuf *m, + struct buf_vector *buf_vec, uint16_t num_buffers) +{ + uint32_t vec_idx = 0; + uint64_t desc_addr; + uint32_t mbuf_offset, mbuf_avail; + uint32_t desc_offset, desc_avail; + uint32_t cpy_len; + uint64_t hdr_addr, hdr_phys_addr; + struct rte_mbuf *hdr_mbuf; + + if (unlikely(m == NULL)) + return -1; + + desc_addr = rte_vhost_gpa_to_vva(dev->mem, buf_vec[vec_idx].buf_addr); + if (buf_vec[vec_idx].buf_len < dev->vhost_hlen || !desc_addr) + return -1; + + hdr_mbuf = m; + hdr_addr = desc_addr; + hdr_phys_addr = buf_vec[vec_idx].buf_addr; + rte_prefetch0((void *)(uintptr_t)hdr_addr); + + LOG_DEBUG(VHOST_DATA, "(%d) RX: num merge buffers %d\n", + dev->vid, num_buffers); + + desc_avail = buf_vec[vec_idx].buf_len - dev->vhost_hlen; + desc_offset = dev->vhost_hlen; + + mbuf_avail = rte_pktmbuf_data_len(m); + mbuf_offset = 0; + while (mbuf_avail != 0 || m->next != NULL) { + /* done with current desc buf, get the next one */ + if (desc_avail == 0) { + vec_idx++; + desc_addr = rte_vhost_gpa_to_vva(dev->mem, + buf_vec[vec_idx].buf_addr); + if (unlikely(!desc_addr)) + return -1; + + /* Prefetch buffer address. */ + rte_prefetch0((void *)(uintptr_t)desc_addr); + desc_offset = 0; + desc_avail = buf_vec[vec_idx].buf_len; + } + + /* done with current mbuf, get the next one */ + if (mbuf_avail == 0) { + m = m->next; + + mbuf_offset = 0; + mbuf_avail = rte_pktmbuf_data_len(m); + } + + if (hdr_addr) { + struct virtio_net_hdr_mrg_rxbuf *hdr; + + hdr = (struct virtio_net_hdr_mrg_rxbuf *)(uintptr_t) + hdr_addr; + virtio_enqueue_offload(hdr_mbuf, &hdr->hdr); + ASSIGN_UNLESS_EQUAL(hdr->num_buffers, num_buffers); + + vhost_log_write(dev, hdr_phys_addr, dev->vhost_hlen); + PRINT_PACKET(dev, (uintptr_t)hdr_addr, + dev->vhost_hlen, 0); + + hdr_addr = 0; + } + + cpy_len = RTE_MIN(desc_avail, mbuf_avail); + rte_memcpy((void *)((uintptr_t)(desc_addr + desc_offset)), + rte_pktmbuf_mtod_offset(m, void *, mbuf_offset), + cpy_len); + vhost_log_write(dev, buf_vec[vec_idx].buf_addr + desc_offset, + cpy_len); + PRINT_PACKET(dev, (uintptr_t)(desc_addr + desc_offset), + cpy_len, 0); + + mbuf_avail -= cpy_len; + mbuf_offset += cpy_len; + desc_avail -= cpy_len; + desc_offset += cpy_len; + } + + return 0; +} + +static inline uint32_t __attribute__((always_inline)) +virtio_dev_merge_rx(struct virtio_net *dev, uint16_t queue_id, + struct rte_mbuf **pkts, uint32_t count) +{ + struct vhost_virtqueue *vq; + uint32_t pkt_idx = 0; + uint16_t num_buffers; + struct buf_vector buf_vec[BUF_VECTOR_MAX]; + uint16_t avail_head; + + LOG_DEBUG(VHOST_DATA, "(%d) %s\n", dev->vid, __func__); + if (unlikely(!is_valid_virt_queue_idx(queue_id, 0, dev->nr_vring))) { + RTE_LOG(ERR, VHOST_DATA, "(%d) %s: invalid virtqueue idx %d.\n", + dev->vid, __func__, queue_id); + return 0; + } + + vq = dev->virtqueue[queue_id]; + if (unlikely(vq->enabled == 0)) + return 0; + + count = RTE_MIN((uint32_t)MAX_PKT_BURST, count); + if (count == 0) + return 0; + + rte_prefetch0(&vq->avail->ring[vq->last_avail_idx & (vq->size - 1)]); + + vq->shadow_used_idx = 0; + avail_head = *((volatile uint16_t *)&vq->avail->idx); + for (pkt_idx = 0; pkt_idx < count; pkt_idx++) { + uint32_t pkt_len = pkts[pkt_idx]->pkt_len + dev->vhost_hlen; + + if (unlikely(reserve_avail_buf_mergeable(dev, vq, + pkt_len, buf_vec, &num_buffers, + avail_head) < 0)) { + LOG_DEBUG(VHOST_DATA, + "(%d) failed to get enough desc from vring\n", + dev->vid); + vq->shadow_used_idx -= num_buffers; + break; + } + + LOG_DEBUG(VHOST_DATA, "(%d) current index %d | end index %d\n", + dev->vid, vq->last_avail_idx, + vq->last_avail_idx + num_buffers); + + if (copy_mbuf_to_desc_mergeable(dev, pkts[pkt_idx], + buf_vec, num_buffers) < 0) { + vq->shadow_used_idx -= num_buffers; + break; + } + + vq->last_avail_idx += num_buffers; + } + + if (likely(vq->shadow_used_idx)) { + flush_shadow_used_ring(dev, vq); + + /* flush used->idx update before we read avail->flags. */ + rte_mb(); + + /* Kick the guest if necessary. */ + if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT) + && (vq->callfd >= 0)) + eventfd_write(vq->callfd, (eventfd_t)1); + } + + return pkt_idx; +} + +uint16_t +rte_vhost_enqueue_burst(int vid, uint16_t queue_id, + struct rte_mbuf **pkts, uint16_t count) +{ + struct virtio_net *dev = get_device(vid); + + if (!dev) + return 0; + + if (dev->features & (1 << VIRTIO_NET_F_MRG_RXBUF)) + return virtio_dev_merge_rx(dev, queue_id, pkts, count); + else + return virtio_dev_rx(dev, queue_id, pkts, count); +} + +static inline bool +virtio_net_with_host_offload(struct virtio_net *dev) +{ + if (dev->features & + (VIRTIO_NET_F_CSUM | VIRTIO_NET_F_HOST_ECN | + VIRTIO_NET_F_HOST_TSO4 | VIRTIO_NET_F_HOST_TSO6 | + VIRTIO_NET_F_HOST_UFO)) + return true; + + return false; +} + +static void +parse_ethernet(struct rte_mbuf *m, uint16_t *l4_proto, void **l4_hdr) +{ + struct ipv4_hdr *ipv4_hdr; + struct ipv6_hdr *ipv6_hdr; + void *l3_hdr = NULL; + struct ether_hdr *eth_hdr; + uint16_t ethertype; + + eth_hdr = rte_pktmbuf_mtod(m, struct ether_hdr *); + + m->l2_len = sizeof(struct ether_hdr); + ethertype = rte_be_to_cpu_16(eth_hdr->ether_type); + + if (ethertype == ETHER_TYPE_VLAN) { + struct vlan_hdr *vlan_hdr = (struct vlan_hdr *)(eth_hdr + 1); + + m->l2_len += sizeof(struct vlan_hdr); + ethertype = rte_be_to_cpu_16(vlan_hdr->eth_proto); + } + + l3_hdr = (char *)eth_hdr + m->l2_len; + + switch (ethertype) { + case ETHER_TYPE_IPv4: + ipv4_hdr = l3_hdr; + *l4_proto = ipv4_hdr->next_proto_id; + m->l3_len = (ipv4_hdr->version_ihl & 0x0f) * 4; + *l4_hdr = (char *)l3_hdr + m->l3_len; + m->ol_flags |= PKT_TX_IPV4; + break; + case ETHER_TYPE_IPv6: + ipv6_hdr = l3_hdr; + *l4_proto = ipv6_hdr->proto; + m->l3_len = sizeof(struct ipv6_hdr); + *l4_hdr = (char *)l3_hdr + m->l3_len; + m->ol_flags |= PKT_TX_IPV6; + break; + default: + m->l3_len = 0; + *l4_proto = 0; + *l4_hdr = NULL; + break; + } +} + +static inline void __attribute__((always_inline)) +vhost_dequeue_offload(struct virtio_net_hdr *hdr, struct rte_mbuf *m) +{ + uint16_t l4_proto = 0; + void *l4_hdr = NULL; + struct tcp_hdr *tcp_hdr = NULL; + + if (hdr->flags == 0 && hdr->gso_type == VIRTIO_NET_HDR_GSO_NONE) + return; + + parse_ethernet(m, &l4_proto, &l4_hdr); + if (hdr->flags == VIRTIO_NET_HDR_F_NEEDS_CSUM) { + if (hdr->csum_start == (m->l2_len + m->l3_len)) { + switch (hdr->csum_offset) { + case (offsetof(struct tcp_hdr, cksum)): + if (l4_proto == IPPROTO_TCP) + m->ol_flags |= PKT_TX_TCP_CKSUM; + break; + case (offsetof(struct udp_hdr, dgram_cksum)): + if (l4_proto == IPPROTO_UDP) + m->ol_flags |= PKT_TX_UDP_CKSUM; + break; + case (offsetof(struct sctp_hdr, cksum)): + if (l4_proto == IPPROTO_SCTP) + m->ol_flags |= PKT_TX_SCTP_CKSUM; + break; + default: + break; + } + } + } + + if (l4_hdr && hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) { + switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { + case VIRTIO_NET_HDR_GSO_TCPV4: + case VIRTIO_NET_HDR_GSO_TCPV6: + tcp_hdr = l4_hdr; + m->ol_flags |= PKT_TX_TCP_SEG; + m->tso_segsz = hdr->gso_size; + m->l4_len = (tcp_hdr->data_off & 0xf0) >> 2; + break; + default: + RTE_LOG(WARNING, VHOST_DATA, + "unsupported gso type %u.\n", hdr->gso_type); + break; + } + } +} + +#define RARP_PKT_SIZE 64 + +static int +make_rarp_packet(struct rte_mbuf *rarp_mbuf, const struct ether_addr *mac) +{ + struct ether_hdr *eth_hdr; + struct arp_hdr *rarp; + + if (rarp_mbuf->buf_len < 64) { + RTE_LOG(WARNING, VHOST_DATA, + "failed to make RARP; mbuf size too small %u (< %d)\n", + rarp_mbuf->buf_len, RARP_PKT_SIZE); + return -1; + } + + /* Ethernet header. */ + eth_hdr = rte_pktmbuf_mtod_offset(rarp_mbuf, struct ether_hdr *, 0); + memset(eth_hdr->d_addr.addr_bytes, 0xff, ETHER_ADDR_LEN); + ether_addr_copy(mac, ð_hdr->s_addr); + eth_hdr->ether_type = htons(ETHER_TYPE_RARP); + + /* RARP header. */ + rarp = (struct arp_hdr *)(eth_hdr + 1); + rarp->arp_hrd = htons(ARP_HRD_ETHER); + rarp->arp_pro = htons(ETHER_TYPE_IPv4); + rarp->arp_hln = ETHER_ADDR_LEN; + rarp->arp_pln = 4; + rarp->arp_op = htons(ARP_OP_REVREQUEST); + + ether_addr_copy(mac, &rarp->arp_data.arp_sha); + ether_addr_copy(mac, &rarp->arp_data.arp_tha); + memset(&rarp->arp_data.arp_sip, 0x00, 4); + memset(&rarp->arp_data.arp_tip, 0x00, 4); + + rarp_mbuf->pkt_len = rarp_mbuf->data_len = RARP_PKT_SIZE; + + return 0; +} + +static inline void __attribute__((always_inline)) +put_zmbuf(struct zcopy_mbuf *zmbuf) +{ + zmbuf->in_use = 0; +} + +static inline int __attribute__((always_inline)) +copy_desc_to_mbuf(struct virtio_net *dev, struct vring_desc *descs, + uint16_t max_desc, struct rte_mbuf *m, uint16_t desc_idx, + struct rte_mempool *mbuf_pool) +{ + struct vring_desc *desc; + uint64_t desc_addr; + uint32_t desc_avail, desc_offset; + uint32_t mbuf_avail, mbuf_offset; + uint32_t cpy_len; + struct rte_mbuf *cur = m, *prev = m; + struct virtio_net_hdr *hdr = NULL; + /* A counter to avoid desc dead loop chain */ + uint32_t nr_desc = 1; + + desc = &descs[desc_idx]; + if (unlikely((desc->len < dev->vhost_hlen)) || + (desc->flags & VRING_DESC_F_INDIRECT)) + return -1; + + desc_addr = rte_vhost_gpa_to_vva(dev->mem, desc->addr); + if (unlikely(!desc_addr)) + return -1; + + if (virtio_net_with_host_offload(dev)) { + hdr = (struct virtio_net_hdr *)((uintptr_t)desc_addr); + rte_prefetch0(hdr); + } + + /* + * A virtio driver normally uses at least 2 desc buffers + * for Tx: the first for storing the header, and others + * for storing the data. + */ + if (likely((desc->len == dev->vhost_hlen) && + (desc->flags & VRING_DESC_F_NEXT) != 0)) { + desc = &descs[desc->next]; + if (unlikely(desc->flags & VRING_DESC_F_INDIRECT)) + return -1; + + desc_addr = rte_vhost_gpa_to_vva(dev->mem, desc->addr); + if (unlikely(!desc_addr)) + return -1; + + desc_offset = 0; + desc_avail = desc->len; + nr_desc += 1; + } else { + desc_avail = desc->len - dev->vhost_hlen; + desc_offset = dev->vhost_hlen; + } + + rte_prefetch0((void *)(uintptr_t)(desc_addr + desc_offset)); + + PRINT_PACKET(dev, (uintptr_t)(desc_addr + desc_offset), desc_avail, 0); + + mbuf_offset = 0; + mbuf_avail = m->buf_len - RTE_PKTMBUF_HEADROOM; + while (1) { + uint64_t hpa; + + cpy_len = RTE_MIN(desc_avail, mbuf_avail); + + /* + * A desc buf might across two host physical pages that are + * not continuous. In such case (gpa_to_hpa returns 0), data + * will be copied even though zero copy is enabled. + */ + if (unlikely(dev->dequeue_zero_copy && (hpa = gpa_to_hpa(dev, + desc->addr + desc_offset, cpy_len)))) { + cur->data_len = cpy_len; + cur->data_off = 0; + cur->buf_addr = (void *)(uintptr_t)desc_addr; + cur->buf_physaddr = hpa; + + /* + * In zero copy mode, one mbuf can only reference data + * for one or partial of one desc buff. + */ + mbuf_avail = cpy_len; + } else { + rte_memcpy(rte_pktmbuf_mtod_offset(cur, void *, + mbuf_offset), + (void *)((uintptr_t)(desc_addr + desc_offset)), + cpy_len); + } + + mbuf_avail -= cpy_len; + mbuf_offset += cpy_len; + desc_avail -= cpy_len; + desc_offset += cpy_len; + + /* This desc reaches to its end, get the next one */ + if (desc_avail == 0) { + if ((desc->flags & VRING_DESC_F_NEXT) == 0) + break; + + if (unlikely(desc->next >= max_desc || + ++nr_desc > max_desc)) + return -1; + desc = &descs[desc->next]; + if (unlikely(desc->flags & VRING_DESC_F_INDIRECT)) + return -1; + + desc_addr = rte_vhost_gpa_to_vva(dev->mem, desc->addr); + if (unlikely(!desc_addr)) + return -1; + + rte_prefetch0((void *)(uintptr_t)desc_addr); + + desc_offset = 0; + desc_avail = desc->len; + + PRINT_PACKET(dev, (uintptr_t)desc_addr, desc->len, 0); + } + + /* + * This mbuf reaches to its end, get a new one + * to hold more data. + */ + if (mbuf_avail == 0) { + cur = rte_pktmbuf_alloc(mbuf_pool); + if (unlikely(cur == NULL)) { + RTE_LOG(ERR, VHOST_DATA, "Failed to " + "allocate memory for mbuf.\n"); + return -1; + } + if (unlikely(dev->dequeue_zero_copy)) + rte_mbuf_refcnt_update(cur, 1); + + prev->next = cur; + prev->data_len = mbuf_offset; + m->nb_segs += 1; + m->pkt_len += mbuf_offset; + prev = cur; + + mbuf_offset = 0; + mbuf_avail = cur->buf_len - RTE_PKTMBUF_HEADROOM; + } + } + + prev->data_len = mbuf_offset; + m->pkt_len += mbuf_offset; + + if (hdr) + vhost_dequeue_offload(hdr, m); + + return 0; +} + +static inline void __attribute__((always_inline)) +update_used_ring(struct virtio_net *dev, struct vhost_virtqueue *vq, + uint32_t used_idx, uint32_t desc_idx) +{ + vq->used->ring[used_idx].id = desc_idx; + vq->used->ring[used_idx].len = 0; + vhost_log_used_vring(dev, vq, + offsetof(struct vring_used, ring[used_idx]), + sizeof(vq->used->ring[used_idx])); +} + +static inline void __attribute__((always_inline)) +update_used_idx(struct virtio_net *dev, struct vhost_virtqueue *vq, + uint32_t count) +{ + if (unlikely(count == 0)) + return; + + rte_smp_wmb(); + rte_smp_rmb(); + + vq->used->idx += count; + vhost_log_used_vring(dev, vq, offsetof(struct vring_used, idx), + sizeof(vq->used->idx)); + + /* Kick guest if required. */ + if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT) + && (vq->callfd >= 0)) + eventfd_write(vq->callfd, (eventfd_t)1); +} + +static inline struct zcopy_mbuf *__attribute__((always_inline)) +get_zmbuf(struct vhost_virtqueue *vq) +{ + uint16_t i; + uint16_t last; + int tries = 0; + + /* search [last_zmbuf_idx, zmbuf_size) */ + i = vq->last_zmbuf_idx; + last = vq->zmbuf_size; + +again: + for (; i < last; i++) { + if (vq->zmbufs[i].in_use == 0) { + vq->last_zmbuf_idx = i + 1; + vq->zmbufs[i].in_use = 1; + return &vq->zmbufs[i]; + } + } + + tries++; + if (tries == 1) { + /* search [0, last_zmbuf_idx) */ + i = 0; + last = vq->last_zmbuf_idx; + goto again; + } + + return NULL; +} + +static inline bool __attribute__((always_inline)) +mbuf_is_consumed(struct rte_mbuf *m) +{ + while (m) { + if (rte_mbuf_refcnt_read(m) > 1) + return false; + m = m->next; + } + + return true; +} + +uint16_t +rte_vhost_dequeue_burst(int vid, uint16_t queue_id, + struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t count) +{ + struct virtio_net *dev; + struct rte_mbuf *rarp_mbuf = NULL; + struct vhost_virtqueue *vq; + uint32_t desc_indexes[MAX_PKT_BURST]; + uint32_t used_idx; + uint32_t i = 0; + uint16_t free_entries; + uint16_t avail_idx; + + dev = get_device(vid); + if (!dev) + return 0; + + if (unlikely(!is_valid_virt_queue_idx(queue_id, 1, dev->nr_vring))) { + RTE_LOG(ERR, VHOST_DATA, "(%d) %s: invalid virtqueue idx %d.\n", + dev->vid, __func__, queue_id); + return 0; + } + + vq = dev->virtqueue[queue_id]; + if (unlikely(vq->enabled == 0)) + return 0; + + if (unlikely(dev->dequeue_zero_copy)) { + struct zcopy_mbuf *zmbuf, *next; + int nr_updated = 0; + + for (zmbuf = TAILQ_FIRST(&vq->zmbuf_list); + zmbuf != NULL; zmbuf = next) { + next = TAILQ_NEXT(zmbuf, next); + + if (mbuf_is_consumed(zmbuf->mbuf)) { + used_idx = vq->last_used_idx++ & (vq->size - 1); + update_used_ring(dev, vq, used_idx, + zmbuf->desc_idx); + nr_updated += 1; + + TAILQ_REMOVE(&vq->zmbuf_list, zmbuf, next); + rte_pktmbuf_free(zmbuf->mbuf); + put_zmbuf(zmbuf); + vq->nr_zmbuf -= 1; + } + } + + update_used_idx(dev, vq, nr_updated); + } + + /* + * Construct a RARP broadcast packet, and inject it to the "pkts" + * array, to looks like that guest actually send such packet. + * + * Check user_send_rarp() for more information. + * + * broadcast_rarp shares a cacheline in the virtio_net structure + * with some fields that are accessed during enqueue and + * rte_atomic16_cmpset() causes a write if using cmpxchg. This could + * result in false sharing between enqueue and dequeue. + * + * Prevent unnecessary false sharing by reading broadcast_rarp first + * and only performing cmpset if the read indicates it is likely to + * be set. + */ + + if (unlikely(rte_atomic16_read(&dev->broadcast_rarp) && + rte_atomic16_cmpset((volatile uint16_t *) + &dev->broadcast_rarp.cnt, 1, 0))) { + + rarp_mbuf = rte_pktmbuf_alloc(mbuf_pool); + if (rarp_mbuf == NULL) { + RTE_LOG(ERR, VHOST_DATA, + "Failed to allocate memory for mbuf.\n"); + return 0; + } + + if (make_rarp_packet(rarp_mbuf, &dev->mac)) { + rte_pktmbuf_free(rarp_mbuf); + rarp_mbuf = NULL; + } else { + count -= 1; + } + } + + free_entries = *((volatile uint16_t *)&vq->avail->idx) - + vq->last_avail_idx; + if (free_entries == 0) + goto out; + + LOG_DEBUG(VHOST_DATA, "(%d) %s\n", dev->vid, __func__); + + /* Prefetch available and used ring */ + avail_idx = vq->last_avail_idx & (vq->size - 1); + used_idx = vq->last_used_idx & (vq->size - 1); + rte_prefetch0(&vq->avail->ring[avail_idx]); + rte_prefetch0(&vq->used->ring[used_idx]); + + count = RTE_MIN(count, MAX_PKT_BURST); + count = RTE_MIN(count, free_entries); + LOG_DEBUG(VHOST_DATA, "(%d) about to dequeue %u buffers\n", + dev->vid, count); + + /* Retrieve all of the head indexes first to avoid caching issues. */ + for (i = 0; i < count; i++) { + avail_idx = (vq->last_avail_idx + i) & (vq->size - 1); + used_idx = (vq->last_used_idx + i) & (vq->size - 1); + desc_indexes[i] = vq->avail->ring[avail_idx]; + + if (likely(dev->dequeue_zero_copy == 0)) + update_used_ring(dev, vq, used_idx, desc_indexes[i]); + } + + /* Prefetch descriptor index. */ + rte_prefetch0(&vq->desc[desc_indexes[0]]); + for (i = 0; i < count; i++) { + struct vring_desc *desc; + uint16_t sz, idx; + int err; + + if (likely(i + 1 < count)) + rte_prefetch0(&vq->desc[desc_indexes[i + 1]]); + + if (vq->desc[desc_indexes[i]].flags & VRING_DESC_F_INDIRECT) { + desc = (struct vring_desc *)(uintptr_t) + rte_vhost_gpa_to_vva(dev->mem, + vq->desc[desc_indexes[i]].addr); + if (unlikely(!desc)) + break; + + rte_prefetch0(desc); + sz = vq->desc[desc_indexes[i]].len / sizeof(*desc); + idx = 0; + } else { + desc = vq->desc; + sz = vq->size; + idx = desc_indexes[i]; + } + + pkts[i] = rte_pktmbuf_alloc(mbuf_pool); + if (unlikely(pkts[i] == NULL)) { + RTE_LOG(ERR, VHOST_DATA, + "Failed to allocate memory for mbuf.\n"); + break; + } + + err = copy_desc_to_mbuf(dev, desc, sz, pkts[i], idx, mbuf_pool); + if (unlikely(err)) { + rte_pktmbuf_free(pkts[i]); + break; + } + + if (unlikely(dev->dequeue_zero_copy)) { + struct zcopy_mbuf *zmbuf; + + zmbuf = get_zmbuf(vq); + if (!zmbuf) { + rte_pktmbuf_free(pkts[i]); + break; + } + zmbuf->mbuf = pkts[i]; + zmbuf->desc_idx = desc_indexes[i]; + + /* + * Pin lock the mbuf; we will check later to see + * whether the mbuf is freed (when we are the last + * user) or not. If that's the case, we then could + * update the used ring safely. + */ + rte_mbuf_refcnt_update(pkts[i], 1); + + vq->nr_zmbuf += 1; + TAILQ_INSERT_TAIL(&vq->zmbuf_list, zmbuf, next); + } + } + vq->last_avail_idx += i; + + if (likely(dev->dequeue_zero_copy == 0)) { + vq->last_used_idx += i; + update_used_idx(dev, vq, i); + } + +out: + if (unlikely(rarp_mbuf != NULL)) { + /* + * Inject it to the head of "pkts" array, so that switch's mac + * learning table will get updated first. + */ + memmove(&pkts[1], pkts, i * sizeof(struct rte_mbuf *)); + pkts[0] = rarp_mbuf; + i += 1; + } + + return i; +} |