To be able to manage buffers inside a shared memory provided by a VM via a vhost-user interface, we cannot rely on the fact that buffers are located in a pre-defined memory area and use a base address and a 32bit offset to address them. We need a 64bit address, so replace struct desc by struct iovec and update range checking. Signed-off-by: Laurent Vivier Reviewed-by: David Gibson --- packet.c | 80 ++++++++++++++++++++++++++++++-------------------------- packet.h | 14 ++-------- 2 files changed, 45 insertions(+), 49 deletions(-) diff --git a/packet.c b/packet.c index ccfc84607709..37489961a37e 100644 --- a/packet.c +++ b/packet.c @@ -22,6 +22,35 @@ #include "util.h" #include "log.h" +/** + * packet_check_range() - Check if a packet memory range is valid + * @p: Packet pool + * @offset: Offset of data range in packet descriptor + * @len: Length of desired data range + * @start: Start of the packet descriptor + * @func: For tracing: name of calling function + * @line: For tracing: caller line of function call + * + * Return: 0 if the range is valid, -1 otherwise + */ +static int packet_check_range(const struct pool *p, size_t offset, size_t len, + const char *start, const char *func, int line) +{ + if (start < p->buf) { + trace("packet start %p before buffer start %p, " + "%s:%i", (void *)start, (void *)p->buf, func, line); + return -1; + } + + if (start + len + offset > p->buf + p->buf_size) { + trace("packet offset plus length %lu from size %lu, " + "%s:%i", start - p->buf + len + offset, + p->buf_size, func, line); + return -1; + } + + return 0; +} /** * packet_add_do() - Add data as packet descriptor to given pool * @p: Existing pool @@ -41,34 +70,16 @@ void packet_add_do(struct pool *p, size_t len, const char *start, return; } - if (start < p->buf) { - trace("add packet start %p before buffer start %p, %s:%i", - (void *)start, (void *)p->buf, func, line); + if (packet_check_range(p, 0, len, start, func, line)) return; - } - - if (start + len > p->buf + p->buf_size) { - trace("add packet start %p, length: %zu, buffer end %p, %s:%i", - (void *)start, len, (void *)(p->buf + p->buf_size), - func, line); - return; - } if (len > UINT16_MAX) { trace("add packet length %zu, %s:%i", len, func, line); return; } -#if UINTPTR_MAX == UINT64_MAX - if ((uintptr_t)start - (uintptr_t)p->buf > UINT32_MAX) { - trace("add packet start %p, buffer start %p, %s:%i", - (void *)start, (void *)p->buf, func, line); - return; - } -#endif - - p->pkt[idx].offset = start - p->buf; - p->pkt[idx].len = len; + p->pkt[idx].iov_base = (void *)start; + p->pkt[idx].iov_len = len; p->count++; } @@ -96,36 +107,31 @@ void *packet_get_do(const struct pool *p, size_t idx, size_t offset, return NULL; } - if (len > UINT16_MAX || len + offset > UINT32_MAX) { + if (len > UINT16_MAX) { if (func) { - trace("packet data length %zu, offset %zu, %s:%i", - len, offset, func, line); + trace("packet data length %zu, %s:%i", + len, func, line); } return NULL; } - if (p->pkt[idx].offset + len + offset > p->buf_size) { + if (len + offset > p->pkt[idx].iov_len) { if (func) { - trace("packet offset plus length %zu from size %zu, " - "%s:%i", p->pkt[idx].offset + len + offset, - p->buf_size, func, line); + trace("data length %zu, offset %zu from length %zu, " + "%s:%i", len, offset, p->pkt[idx].iov_len, + func, line); } return NULL; } - if (len + offset > p->pkt[idx].len) { - if (func) { - trace("data length %zu, offset %zu from length %u, " - "%s:%i", len, offset, p->pkt[idx].len, - func, line); - } + if (packet_check_range(p, offset, len, p->pkt[idx].iov_base, + func, line)) return NULL; - } if (left) - *left = p->pkt[idx].len - offset - len; + *left = p->pkt[idx].iov_len - offset - len; - return p->buf + p->pkt[idx].offset + offset; + return (char *)p->pkt[idx].iov_base + offset; } /** diff --git a/packet.h b/packet.h index a784b07bbed5..8377dcf678bb 100644 --- a/packet.h +++ b/packet.h @@ -6,16 +6,6 @@ #ifndef PACKET_H #define PACKET_H -/** - * struct desc - Generic offset-based descriptor within buffer - * @offset: Offset of descriptor relative to buffer start, 32-bit limit - * @len: Length of descriptor, host order, 16-bit limit - */ -struct desc { - uint32_t offset; - uint16_t len; -}; - /** * struct pool - Generic pool of packets stored in a buffer * @buf: Buffer storing packet descriptors @@ -29,7 +19,7 @@ struct pool { size_t buf_size; size_t size; size_t count; - struct desc pkt[1]; + struct iovec pkt[1]; }; void packet_add_do(struct pool *p, size_t len, const char *start, @@ -54,7 +44,7 @@ struct _name ## _t { \ size_t buf_size; \ size_t size; \ size_t count; \ - struct desc pkt[_size]; \ + struct iovec pkt[_size]; \ } #define PACKET_POOL_INIT_NOCAST(_size, _buf, _buf_size) \ -- 2.46.2

Add vhost_user.c and vhost_user.h that define the functions needed to implement vhost-user backend. Signed-off-by: Laurent Vivier --- Makefile | 4 +- vhost_user.c | 999 +++++++++++++++++++++++++++++++++++++++++++++++++++ vhost_user.h | 208 +++++++++++ virtio.h | 1 + 4 files changed, 1210 insertions(+), 2 deletions(-) create mode 100644 vhost_user.c create mode 100644 vhost_user.h diff --git a/Makefile b/Makefile index a2258891f104..0e8ed60a0da1 100644 --- a/Makefile +++ b/Makefile @@ -54,7 +54,7 @@ FLAGS += -DDUAL_STACK_SOCKETS=$(DUAL_STACK_SOCKETS) PASST_SRCS = arch.c arp.c checksum.c conf.c dhcp.c dhcpv6.c flow.c fwd.c \ icmp.c igmp.c inany.c iov.c ip.c isolation.c lineread.c log.c mld.c \ ndp.c netlink.c packet.c passt.c pasta.c pcap.c pif.c tap.c tcp.c \ - tcp_buf.c tcp_splice.c udp.c udp_flow.c util.c virtio.c + tcp_buf.c tcp_splice.c udp.c udp_flow.c util.c vhost_user.c virtio.c QRAP_SRCS = qrap.c SRCS = $(PASST_SRCS) $(QRAP_SRCS) @@ -64,7 +64,7 @@ PASST_HEADERS = arch.h arp.h checksum.h conf.h dhcp.h dhcpv6.h flow.h fwd.h \ flow_table.h icmp.h icmp_flow.h inany.h iov.h ip.h isolation.h \ lineread.h log.h ndp.h netlink.h packet.h passt.h pasta.h pcap.h pif.h \ siphash.h tap.h tcp.h tcp_buf.h tcp_conn.h tcp_internal.h tcp_splice.h \ - udp.h udp_flow.h util.h virtio.h + udp.h udp_flow.h util.h vhost_user.h virtio.h HEADERS = $(PASST_HEADERS) seccomp.h C := \#include \nstruct tcp_info x = { .tcpi_snd_wnd = 0 }; diff --git a/vhost_user.c b/vhost_user.c new file mode 100644 index 000000000000..952e97efaae8 --- /dev/null +++ b/vhost_user.c @@ -0,0 +1,999 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * vhost-user API, command management and virtio interface + * + * Copyright Red Hat + * Author: Laurent Vivier + * + * Some parts from QEMU subprojects/libvhost-user/libvhost-user.c + * licensed under the following terms: + * + * Copyright IBM, Corp. 2007 + * Copyright (c) 2016 Red Hat, Inc. + * + * Authors: + * Anthony Liguori + * Marc-André Lureau + * Victor Kaplansky + * + * This work is licensed under the terms of the GNU GPL, version 2 or + * later. See the COPYING file in the top-level directory. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "util.h" +#include "passt.h" +#include "tap.h" +#include "vhost_user.h" +#include "pcap.h" + +/* vhost-user version we are compatible with */ +#define VHOST_USER_VERSION 1 + +/** + * vu_print_capabilities() - print vhost-user capabilities + * this is part of the vhost-user backend + * convention. + */ +/* cppcheck-suppress unusedFunction */ +void vu_print_capabilities(void) +{ + info("{"); + info(" \"type\": \"net\""); + info("}"); + exit(EXIT_SUCCESS); +} + +/** + * vu_request_to_string() - convert a vhost-user request number to its name + * @req: request number + * + * Return: the name of request number + */ +static const char *vu_request_to_string(unsigned int req) +{ + if (req < VHOST_USER_MAX) { +#define REQ(req) [req] = #req + static const char * const vu_request_str[VHOST_USER_MAX] = { + REQ(VHOST_USER_NONE), + REQ(VHOST_USER_GET_FEATURES), + REQ(VHOST_USER_SET_FEATURES), + REQ(VHOST_USER_SET_OWNER), + REQ(VHOST_USER_RESET_OWNER), + REQ(VHOST_USER_SET_MEM_TABLE), + REQ(VHOST_USER_SET_LOG_BASE), + REQ(VHOST_USER_SET_LOG_FD), + REQ(VHOST_USER_SET_VRING_NUM), + REQ(VHOST_USER_SET_VRING_ADDR), + REQ(VHOST_USER_SET_VRING_BASE), + REQ(VHOST_USER_GET_VRING_BASE), + REQ(VHOST_USER_SET_VRING_KICK), + REQ(VHOST_USER_SET_VRING_CALL), + REQ(VHOST_USER_SET_VRING_ERR), + REQ(VHOST_USER_GET_PROTOCOL_FEATURES), + REQ(VHOST_USER_SET_PROTOCOL_FEATURES), + REQ(VHOST_USER_GET_QUEUE_NUM), + REQ(VHOST_USER_SET_VRING_ENABLE), + REQ(VHOST_USER_SEND_RARP), + REQ(VHOST_USER_NET_SET_MTU), + REQ(VHOST_USER_SET_BACKEND_REQ_FD), + REQ(VHOST_USER_IOTLB_MSG), + REQ(VHOST_USER_SET_VRING_ENDIAN), + REQ(VHOST_USER_GET_CONFIG), + REQ(VHOST_USER_SET_CONFIG), + REQ(VHOST_USER_POSTCOPY_ADVISE), + REQ(VHOST_USER_POSTCOPY_LISTEN), + REQ(VHOST_USER_POSTCOPY_END), + REQ(VHOST_USER_GET_INFLIGHT_FD), + REQ(VHOST_USER_SET_INFLIGHT_FD), + REQ(VHOST_USER_GPU_SET_SOCKET), + REQ(VHOST_USER_VRING_KICK), + REQ(VHOST_USER_GET_MAX_MEM_SLOTS), + REQ(VHOST_USER_ADD_MEM_REG), + REQ(VHOST_USER_REM_MEM_REG), + }; +#undef REQ + return vu_request_str[req]; + } + + return "unknown"; +} + +/** + * qva_to_va() - Translate front-end (QEMU) virtual address to our virtual + * address + * @dev: vhost-user device + * @qemu_addr: front-end userspace address + * + * Return: the memory address in our process virtual address space. + */ +static void *qva_to_va(struct vu_dev *dev, uint64_t qemu_addr) +{ + unsigned int i; + + /* Find matching memory region. */ + for (i = 0; i < dev->nregions; i++) { + const struct vu_dev_region *r = &dev->regions[i]; + + if ((qemu_addr >= r->qva) && (qemu_addr < (r->qva + r->size))) { + /* NOLINTNEXTLINE(performance-no-int-to-ptr) */ + return (void *)(qemu_addr - r->qva + r->mmap_addr + + r->mmap_offset); + } + } + + return NULL; +} + +/** + * vmsg_close_fds() - Close all file descriptors of a given message + * @vmsg: vhost-user message with the list of the file descriptors + */ +static void vmsg_close_fds(const struct vhost_user_msg *vmsg) +{ + int i; + + for (i = 0; i < vmsg->fd_num; i++) + close(vmsg->fds[i]); +} + +/** + * vu_remove_watch() - Remove a file descriptor from our passt epoll + * file descriptor + * @vdev: vhost-user device + * @fd: file descriptor to remove + */ +static void vu_remove_watch(const struct vu_dev *vdev, int fd) +{ + /* Placeholder to add passt related code */ + (void)vdev; + (void)fd; +} + +/** + * vmsg_set_reply_u64() - Set reply payload.u64 and clear request flags + * and fd_num + * @vmsg: vhost-user message + * @val: 64-bit value to reply + */ +static void vmsg_set_reply_u64(struct vhost_user_msg *vmsg, uint64_t val) +{ + vmsg->hdr.flags = 0; /* defaults will be set by vu_send_reply() */ + vmsg->hdr.size = sizeof(vmsg->payload.u64); + vmsg->payload.u64 = val; + vmsg->fd_num = 0; +} + +/** + * vu_message_read_default() - Read incoming vhost-user message from the + * front-end + * @conn_fd: vhost-user command socket + * @vmsg: vhost-user message + * + * Return: 0 if recvmsg() has been interrupted or if there's no data to read, + * 1 if a message has been received + */ +static int vu_message_read_default(int conn_fd, struct vhost_user_msg *vmsg) +{ + char control[CMSG_SPACE(VHOST_MEMORY_BASELINE_NREGIONS * + sizeof(int))] = { 0 }; + struct iovec iov = { + .iov_base = (char *)vmsg, + .iov_len = VHOST_USER_HDR_SIZE, + }; + struct msghdr msg = { + .msg_iov = &iov, + .msg_iovlen = 1, + .msg_control = control, + .msg_controllen = sizeof(control), + }; + ssize_t ret, sz_payload; + struct cmsghdr *cmsg; + + ret = recvmsg(conn_fd, &msg, MSG_DONTWAIT); + if (ret < 0) { + if (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK) + return 0; + die_perror("vhost-user message receive (recvmsg)"); + } + + vmsg->fd_num = 0; + for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL; + cmsg = CMSG_NXTHDR(&msg, cmsg)) { + if (cmsg->cmsg_level == SOL_SOCKET && + cmsg->cmsg_type == SCM_RIGHTS) { + size_t fd_size; + + ASSERT(cmsg->cmsg_len >= CMSG_LEN(0)); + fd_size = cmsg->cmsg_len - CMSG_LEN(0); + ASSERT(fd_size <= sizeof(vmsg->fds)); + vmsg->fd_num = fd_size / sizeof(int); + memcpy(vmsg->fds, CMSG_DATA(cmsg), fd_size); + break; + } + } + + sz_payload = vmsg->hdr.size; + if ((size_t)sz_payload > sizeof(vmsg->payload)) { + die("vhost-user message request too big: %d," + " size: vmsg->size: %zd, " + "while sizeof(vmsg->payload) = %zu", + vmsg->hdr.request, sz_payload, sizeof(vmsg->payload)); + } + + if (sz_payload) { + do + ret = recv(conn_fd, &vmsg->payload, sz_payload, 0); + while (ret < 0 && errno == EINTR); + + if (ret < 0) + die_perror("vhost-user message receive"); + + if (ret == 0) + die("EOF on vhost-user message receive"); + + if (ret < sz_payload) + die("Short-read on vhost-user message receive"); + } + + return 1; +} + +/** + * vu_message_write() - Send a message to the front-end + * @conn_fd: vhost-user command socket + * @vmsg: vhost-user message + * + * #syscalls:vu sendmsg + */ +static void vu_message_write(int conn_fd, struct vhost_user_msg *vmsg) +{ + char control[CMSG_SPACE(VHOST_MEMORY_BASELINE_NREGIONS * sizeof(int))] = { 0 }; + struct iovec iov = { + .iov_base = (char *)vmsg, + .iov_len = VHOST_USER_HDR_SIZE + vmsg->hdr.size, + }; + struct msghdr msg = { + .msg_iov = &iov, + .msg_iovlen = 1, + .msg_control = control, + }; + int rc; + + ASSERT(vmsg->fd_num <= VHOST_MEMORY_BASELINE_NREGIONS); + if (vmsg->fd_num > 0) { + size_t fdsize = vmsg->fd_num * sizeof(int); + struct cmsghdr *cmsg; + + msg.msg_controllen = CMSG_SPACE(fdsize); + cmsg = CMSG_FIRSTHDR(&msg); + cmsg->cmsg_len = CMSG_LEN(fdsize); + cmsg->cmsg_level = SOL_SOCKET; + cmsg->cmsg_type = SCM_RIGHTS; + memcpy(CMSG_DATA(cmsg), vmsg->fds, fdsize); + } + + do + rc = sendmsg(conn_fd, &msg, 0); + while (rc < 0 && errno == EINTR); + + if (rc < 0) + die_perror("vhost-user message send"); + + if ((uint32_t)rc < VHOST_USER_HDR_SIZE + vmsg->hdr.size) + die("EOF on vhost-user message send"); +} + +/** + * vu_send_reply() - Update message flags and send it to front-end + * @conn_fd: vhost-user command socket + * @vmsg: vhost-user message + */ +static void vu_send_reply(int conn_fd, struct vhost_user_msg *msg) +{ + msg->hdr.flags &= ~VHOST_USER_VERSION_MASK; + msg->hdr.flags |= VHOST_USER_VERSION; + msg->hdr.flags |= VHOST_USER_REPLY_MASK; + + vu_message_write(conn_fd, msg); +} + +/** + * vu_get_features_exec() - Provide back-end features bitmask to front-end + * @vdev: vhost-user device + * @vmsg: vhost-user message + * + * Return: True as a reply is requested + */ +static bool vu_get_features_exec(struct vu_dev *vdev, + struct vhost_user_msg *msg) +{ + uint64_t features = + 1ULL << VIRTIO_F_VERSION_1 | + 1ULL << VIRTIO_NET_F_MRG_RXBUF | + 1ULL << VHOST_USER_F_PROTOCOL_FEATURES; + + (void)vdev; + + vmsg_set_reply_u64(msg, features); + + debug("Sending back to guest u64: 0x%016"PRIx64, msg->payload.u64); + + return true; +} + +/** + * vu_set_enable_all_rings() - Enable/disable all the virtqueues + * @vdev: vhost-user device + * @enable: New virtqueues state + */ +static void vu_set_enable_all_rings(struct vu_dev *vdev, bool enable) +{ + uint16_t i; + + for (i = 0; i < VHOST_USER_MAX_QUEUES; i++) + vdev->vq[i].enable = enable; +} + +/** + * vu_set_features_exec() - Enable features of the back-end + * @vdev: vhost-user device + * @vmsg: vhost-user message + * + * Return: False as no reply is requested + */ +static bool vu_set_features_exec(struct vu_dev *vdev, + struct vhost_user_msg *msg) +{ + debug("u64: 0x%016"PRIx64, msg->payload.u64); + + vdev->features = msg->payload.u64; + /* We only support devices conforming to VIRTIO 1.0 or + * later + */ + if (!vu_has_feature(vdev, VIRTIO_F_VERSION_1)) + die("virtio legacy devices aren't supported by passt"); + + if (!vu_has_feature(vdev, VHOST_USER_F_PROTOCOL_FEATURES)) + vu_set_enable_all_rings(vdev, true); + + return false; +} + +/** + * vu_set_owner_exec() - Session start flag, do nothing in our case + * @vdev: vhost-user device + * @vmsg: vhost-user message + * + * Return: False as no reply is requested + */ +static bool vu_set_owner_exec(struct vu_dev *vdev, + struct vhost_user_msg *msg) +{ + (void)vdev; + (void)msg; + + return false; +} + +/** + * map_ring() - Convert ring front-end (QEMU) addresses to our process + * virtual address space. + * @vdev: vhost-user device + * @vq: Virtqueue + * + * Return: True if ring cannot be mapped to our address space + */ +static bool map_ring(struct vu_dev *vdev, struct vu_virtq *vq) +{ + vq->vring.desc = qva_to_va(vdev, vq->vra.desc_user_addr); + vq->vring.used = qva_to_va(vdev, vq->vra.used_user_addr); + vq->vring.avail = qva_to_va(vdev, vq->vra.avail_user_addr); + + debug("Setting virtq addresses:"); + debug(" vring_desc at %p", (void *)vq->vring.desc); + debug(" vring_used at %p", (void *)vq->vring.used); + debug(" vring_avail at %p", (void *)vq->vring.avail); + + return !(vq->vring.desc && vq->vring.used && vq->vring.avail); +} + +/** + * vu_packet_check_range() - Check if a given memory zone is contained in + * a mapped guest memory region + * @buf: Array of the available memory regions + * @offset: Offset of data range in packet descriptor + * @size: Length of desired data range + * @start: Start of the packet descriptor + * + * Return: 0 if the zone is in a mapped memory region, -1 otherwise + */ +/* cppcheck-suppress unusedFunction */ +int vu_packet_check_range(void *buf, size_t offset, size_t len, + const char *start) +{ + struct vu_dev_region *dev_region; + + for (dev_region = buf; dev_region->mmap_addr; dev_region++) { + /* NOLINTNEXTLINE(performance-no-int-to-ptr) */ + char *m = (char *)dev_region->mmap_addr; + + if (m <= start && + start + offset + len <= m + dev_region->mmap_offset + + dev_region->size) + return 0; + } + + return -1; +} + +/** + * vu_set_mem_table_exec() - Sets the memory map regions to be able to + * translate the vring addresses. + * @vdev: vhost-user device + * @vmsg: vhost-user message + * + * Return: False as no reply is requested + * + * #syscalls:vu mmap munmap + */ +static bool vu_set_mem_table_exec(struct vu_dev *vdev, + struct vhost_user_msg *msg) +{ + struct vhost_user_memory m = msg->payload.memory, *memory = &m; + unsigned int i; + + for (i = 0; i < vdev->nregions; i++) { + struct vu_dev_region *r = &vdev->regions[i]; + /* NOLINTNEXTLINE(performance-no-int-to-ptr) */ + void *mm = (void *)r->mmap_addr; + + if (mm) + munmap(mm, r->size + r->mmap_offset); + } + vdev->nregions = memory->nregions; + + debug("vhost-user nregions: %u", memory->nregions); + for (i = 0; i < vdev->nregions; i++) { + struct vhost_user_memory_region *msg_region = &memory->regions[i]; + struct vu_dev_region *dev_region = &vdev->regions[i]; + void *mmap_addr; + + debug("vhost-user region %d", i); + debug(" guest_phys_addr: 0x%016"PRIx64, + msg_region->guest_phys_addr); + debug(" memory_size: 0x%016"PRIx64, + msg_region->memory_size); + debug(" userspace_addr 0x%016"PRIx64, + msg_region->userspace_addr); + debug(" mmap_offset 0x%016"PRIx64, + msg_region->mmap_offset); + + dev_region->gpa = msg_region->guest_phys_addr; + dev_region->size = msg_region->memory_size; + dev_region->qva = msg_region->userspace_addr; + dev_region->mmap_offset = msg_region->mmap_offset; + + /* We don't use offset argument of mmap() since the + * mapped address has to be page aligned. + */ + mmap_addr = mmap(0, dev_region->size + dev_region->mmap_offset, + PROT_READ | PROT_WRITE, MAP_SHARED | + MAP_NORESERVE, msg->fds[i], 0); + + if (mmap_addr == MAP_FAILED) + die_perror("vhost-user region mmap error"); + + dev_region->mmap_addr = (uint64_t)(uintptr_t)mmap_addr; + debug(" mmap_addr: 0x%016"PRIx64, + dev_region->mmap_addr); + + close(msg->fds[i]); + } + + for (i = 0; i < VHOST_USER_MAX_QUEUES; i++) { + if (vdev->vq[i].vring.desc) { + if (map_ring(vdev, &vdev->vq[i])) + die("remapping queue %d during setmemtable", i); + } + } + + return false; +} + +/** + * vu_set_vring_num_exec() - Set the size of the queue (vring size) + * @vdev: vhost-user device + * @vmsg: vhost-user message + * + * Return: False as no reply is requested + */ +static bool vu_set_vring_num_exec(struct vu_dev *vdev, + struct vhost_user_msg *msg) +{ + unsigned int idx = msg->payload.state.index; + unsigned int num = msg->payload.state.num; + + debug("State.index: %u", idx); + debug("State.num: %u", num); + vdev->vq[idx].vring.num = num; + + return false; +} + +/** + * vu_set_vring_addr_exec() - Set the addresses of the vring + * @vdev: vhost-user device + * @vmsg: vhost-user message + * + * Return: False as no reply is requested + */ +static bool vu_set_vring_addr_exec(struct vu_dev *vdev, + struct vhost_user_msg *msg) +{ + /* We need to copy the payload to vhost_vring_addr structure + * to access index because address of msg->payload.addr + * can be unaligned as it is packed. + */ + struct vhost_vring_addr addr = msg->payload.addr; + struct vu_virtq *vq = &vdev->vq[addr.index]; + + debug("vhost_vring_addr:"); + debug(" index: %d", addr.index); + debug(" flags: %d", addr.flags); + debug(" desc_user_addr: 0x%016" PRIx64, + (uint64_t)addr.desc_user_addr); + debug(" used_user_addr: 0x%016" PRIx64, + (uint64_t)addr.used_user_addr); + debug(" avail_user_addr: 0x%016" PRIx64, + (uint64_t)addr.avail_user_addr); + debug(" log_guest_addr: 0x%016" PRIx64, + (uint64_t)addr.log_guest_addr); + + vq->vra = msg->payload.addr; + vq->vring.flags = addr.flags; + vq->vring.log_guest_addr = addr.log_guest_addr; + + if (map_ring(vdev, vq)) + die("Invalid vring_addr message"); + + vq->used_idx = le16toh(vq->vring.used->idx); + + if (vq->last_avail_idx != vq->used_idx) { + debug("Last avail index != used index: %u != %u", + vq->last_avail_idx, vq->used_idx); + } + + return false; +} +/** + * vu_set_vring_base_exec() - Sets the next index to use for descriptors + * in this vring + * @vdev: vhost-user device + * @vmsg: vhost-user message + * + * Return: False as no reply is requested + */ +static bool vu_set_vring_base_exec(struct vu_dev *vdev, + struct vhost_user_msg *msg) +{ + unsigned int idx = msg->payload.state.index; + unsigned int num = msg->payload.state.num; + + debug("State.index: %u", idx); + debug("State.num: %u", num); + vdev->vq[idx].shadow_avail_idx = vdev->vq[idx].last_avail_idx = num; + + return false; +} + +/** + * vu_get_vring_base_exec() - Stops the vring and returns the current + * descriptor index or indices + * @vdev: vhost-user device + * @vmsg: vhost-user message + * + * Return: True as a reply is requested + */ +static bool vu_get_vring_base_exec(struct vu_dev *vdev, + struct vhost_user_msg *msg) +{ + unsigned int idx = msg->payload.state.index; + + debug("State.index: %u", idx); + msg->payload.state.num = vdev->vq[idx].last_avail_idx; + msg->hdr.size = sizeof(msg->payload.state); + + vdev->vq[idx].started = false; + + if (vdev->vq[idx].call_fd != -1) { + close(vdev->vq[idx].call_fd); + vdev->vq[idx].call_fd = -1; + } + if (vdev->vq[idx].kick_fd != -1) { + vu_remove_watch(vdev, vdev->vq[idx].kick_fd); + close(vdev->vq[idx].kick_fd); + vdev->vq[idx].kick_fd = -1; + } + + return true; +} + +/** + * vu_set_watch() - Add a file descriptor to the passt epoll file descriptor + * @vdev: vhost-user device + * @fd: file descriptor to add + */ +static void vu_set_watch(const struct vu_dev *vdev, int fd) +{ + /* Placeholder to add passt related code */ + (void)vdev; + (void)fd; +} + +/** + * vu_check_queue_msg_file() - Check if a message is valid, + * close fds if NOFD bit is set + * @vmsg: vhost-user message + */ +static void vu_check_queue_msg_file(struct vhost_user_msg *msg) +{ + bool nofd = msg->payload.u64 & VHOST_USER_VRING_NOFD_MASK; + int idx = msg->payload.u64 & VHOST_USER_VRING_IDX_MASK; + + if (idx >= VHOST_USER_MAX_QUEUES) + die("Invalid vhost-user queue index: %u", idx); + + if (nofd) { + vmsg_close_fds(msg); + return; + } + + if (msg->fd_num != 1) + die("Invalid fds in vhost-user request: %d", msg->hdr.request); +} + +/** + * vu_set_vring_kick_exec() - Set the event file descriptor for adding buffers + * to the vring + * @vdev: vhost-user device + * @vmsg: vhost-user message + * + * Return: False as no reply is requested + */ +static bool vu_set_vring_kick_exec(struct vu_dev *vdev, + struct vhost_user_msg *msg) +{ + bool nofd = msg->payload.u64 & VHOST_USER_VRING_NOFD_MASK; + int idx = msg->payload.u64 & VHOST_USER_VRING_IDX_MASK; + + debug("u64: 0x%016"PRIx64, msg->payload.u64); + + vu_check_queue_msg_file(msg); + + if (vdev->vq[idx].kick_fd != -1) { + vu_remove_watch(vdev, vdev->vq[idx].kick_fd); + close(vdev->vq[idx].kick_fd); + vdev->vq[idx].kick_fd = -1; + } + + if (!nofd) + vdev->vq[idx].kick_fd = msg->fds[0]; + + debug("Got kick_fd: %d for vq: %d", vdev->vq[idx].kick_fd, idx); + + vdev->vq[idx].started = true; + + if (vdev->vq[idx].kick_fd != -1 && VHOST_USER_IS_QUEUE_TX(idx)) { + vu_set_watch(vdev, vdev->vq[idx].kick_fd); + debug("Waiting for kicks on fd: %d for vq: %d", + vdev->vq[idx].kick_fd, idx); + } + + return false; +} + +/** + * vu_set_vring_call_exec() - Set the event file descriptor to signal when + * buffers are used + * @vdev: vhost-user device + * @vmsg: vhost-user message + * + * Return: False as no reply is requested + */ +static bool vu_set_vring_call_exec(struct vu_dev *vdev, + struct vhost_user_msg *msg) +{ + bool nofd = msg->payload.u64 & VHOST_USER_VRING_NOFD_MASK; + int idx = msg->payload.u64 & VHOST_USER_VRING_IDX_MASK; + + debug("u64: 0x%016"PRIx64, msg->payload.u64); + + vu_check_queue_msg_file(msg); + + if (vdev->vq[idx].call_fd != -1) { + close(vdev->vq[idx].call_fd); + vdev->vq[idx].call_fd = -1; + } + + if (!nofd) + vdev->vq[idx].call_fd = msg->fds[0]; + + /* in case of I/O hang after reconnecting */ + if (vdev->vq[idx].call_fd != -1) + eventfd_write(msg->fds[0], 1); + + debug("Got call_fd: %d for vq: %d", vdev->vq[idx].call_fd, idx); + + return false; +} + +/** + * vu_set_vring_err_exec() - Set the event file descriptor to signal when + * error occurs + * @vdev: vhost-user device + * @vmsg: vhost-user message + * + * Return: False as no reply is requested + */ +static bool vu_set_vring_err_exec(struct vu_dev *vdev, + struct vhost_user_msg *msg) +{ + bool nofd = msg->payload.u64 & VHOST_USER_VRING_NOFD_MASK; + int idx = msg->payload.u64 & VHOST_USER_VRING_IDX_MASK; + + debug("u64: 0x%016"PRIx64, msg->payload.u64); + + vu_check_queue_msg_file(msg); + + if (vdev->vq[idx].err_fd != -1) { + close(vdev->vq[idx].err_fd); + vdev->vq[idx].err_fd = -1; + } + + if (!nofd) + vdev->vq[idx].err_fd = msg->fds[0]; + + return false; +} + +/** + * vu_get_protocol_features_exec() - Provide the protocol (vhost-user) features + * to the front-end + * @vdev: vhost-user device + * @vmsg: vhost-user message + * + * Return: True as a reply is requested + */ +static bool vu_get_protocol_features_exec(struct vu_dev *vdev, + struct vhost_user_msg *msg) +{ + uint64_t features = 1ULL << VHOST_USER_PROTOCOL_F_REPLY_ACK; + + (void)vdev; + vmsg_set_reply_u64(msg, features); + + return true; +} + +/** + * vu_set_protocol_features_exec() - Enable protocol (vhost-user) features + * @vdev: vhost-user device + * @vmsg: vhost-user message + * + * Return: False as no reply is requested + */ +static bool vu_set_protocol_features_exec(struct vu_dev *vdev, + struct vhost_user_msg *msg) +{ + uint64_t features = msg->payload.u64; + + debug("u64: 0x%016"PRIx64, features); + + vdev->protocol_features = msg->payload.u64; + + return false; +} + +/** + * vu_get_queue_num_exec() - Tell how many queues we support + * @vdev: vhost-user device + * @vmsg: vhost-user message + * + * Return: True as a reply is requested + */ +static bool vu_get_queue_num_exec(struct vu_dev *vdev, + struct vhost_user_msg *msg) +{ + (void)vdev; + + vmsg_set_reply_u64(msg, VHOST_USER_MAX_QUEUES); + + return true; +} + +/** + * vu_set_vring_enable_exec() - Enable or disable corresponding vring + * @vdev: vhost-user device + * @vmsg: vhost-user message + * + * Return: False as no reply is requested + */ +static bool vu_set_vring_enable_exec(struct vu_dev *vdev, + struct vhost_user_msg *msg) +{ + unsigned int enable = msg->payload.state.num; + unsigned int idx = msg->payload.state.index; + + debug("State.index: %u", idx); + debug("State.enable: %u", enable); + + if (idx >= VHOST_USER_MAX_QUEUES) + die("Invalid vring_enable index: %u", idx); + + vdev->vq[idx].enable = enable; + return false; +} + +/** + * vu_init() - Initialize vhost-user device structure + * @c: execution context + * @vdev: vhost-user device + */ +/* cppcheck-suppress unusedFunction */ +void vu_init(struct ctx *c, struct vu_dev *vdev) +{ + int i; + + vdev->context = c; + for (i = 0; i < VHOST_USER_MAX_QUEUES; i++) { + vdev->vq[i] = (struct vu_virtq){ + .call_fd = -1, + .kick_fd = -1, + .err_fd = -1, + .notification = true, + }; + } +} + +/** + * vu_cleanup() - Reset vhost-user device + * @vdev: vhost-user device + */ +/* cppcheck-suppress unusedFunction */ +void vu_cleanup(struct vu_dev *vdev) +{ + unsigned int i; + + for (i = 0; i < VHOST_USER_MAX_QUEUES; i++) { + struct vu_virtq *vq = &vdev->vq[i]; + + vq->started = false; + vq->notification = true; + + if (vq->call_fd != -1) { + close(vq->call_fd); + vq->call_fd = -1; + } + if (vq->err_fd != -1) { + close(vq->err_fd); + vq->err_fd = -1; + } + if (vq->kick_fd != -1) { + vu_remove_watch(vdev, vq->kick_fd); + close(vq->kick_fd); + vq->kick_fd = -1; + } + + vq->vring.desc = 0; + vq->vring.used = 0; + vq->vring.avail = 0; + } + + for (i = 0; i < vdev->nregions; i++) { + const struct vu_dev_region *r = &vdev->regions[i]; + /* NOLINTNEXTLINE(performance-no-int-to-ptr) */ + void *m = (void *)r->mmap_addr; + + if (m) + munmap(m, r->size + r->mmap_offset); + } + vdev->nregions = 0; +} + +/** + * vu_sock_reset() - Reset connection socket + * @vdev: vhost-user device + */ +static void vu_sock_reset(struct vu_dev *vdev) +{ + /* Placeholder to add passt related code */ + (void)vdev; +} + +static bool (*vu_handle[VHOST_USER_MAX])(struct vu_dev *vdev, + struct vhost_user_msg *msg) = { + [VHOST_USER_GET_FEATURES] = vu_get_features_exec, + [VHOST_USER_SET_FEATURES] = vu_set_features_exec, + [VHOST_USER_GET_PROTOCOL_FEATURES] = vu_get_protocol_features_exec, + [VHOST_USER_SET_PROTOCOL_FEATURES] = vu_set_protocol_features_exec, + [VHOST_USER_GET_QUEUE_NUM] = vu_get_queue_num_exec, + [VHOST_USER_SET_OWNER] = vu_set_owner_exec, + [VHOST_USER_SET_MEM_TABLE] = vu_set_mem_table_exec, + [VHOST_USER_SET_VRING_NUM] = vu_set_vring_num_exec, + [VHOST_USER_SET_VRING_ADDR] = vu_set_vring_addr_exec, + [VHOST_USER_SET_VRING_BASE] = vu_set_vring_base_exec, + [VHOST_USER_GET_VRING_BASE] = vu_get_vring_base_exec, + [VHOST_USER_SET_VRING_KICK] = vu_set_vring_kick_exec, + [VHOST_USER_SET_VRING_CALL] = vu_set_vring_call_exec, + [VHOST_USER_SET_VRING_ERR] = vu_set_vring_err_exec, + [VHOST_USER_SET_VRING_ENABLE] = vu_set_vring_enable_exec, +}; + +/** + * vu_control_handler() - Handle control commands for vhost-user + * @vdev: vhost-user device + * @fd: vhost-user message socket + * @events: epoll events + */ +/* cppcheck-suppress unusedFunction */ +void vu_control_handler(struct vu_dev *vdev, int fd, uint32_t events) +{ + struct vhost_user_msg msg = { 0 }; + bool need_reply, reply_requested; + int ret; + + if (events & (EPOLLRDHUP | EPOLLHUP | EPOLLERR)) { + vu_sock_reset(vdev); + return; + } + + ret = vu_message_read_default(fd, &msg); + if (ret == 0) { + vu_sock_reset(vdev); + return; + } + debug("================ Vhost user message ================"); + debug("Request: %s (%d)", vu_request_to_string(msg.hdr.request), + msg.hdr.request); + debug("Flags: 0x%x", msg.hdr.flags); + debug("Size: %u", msg.hdr.size); + + need_reply = msg.hdr.flags & VHOST_USER_NEED_REPLY_MASK; + + if (msg.hdr.request >= 0 && msg.hdr.request < VHOST_USER_MAX && + vu_handle[msg.hdr.request]) + reply_requested = vu_handle[msg.hdr.request](vdev, &msg); + else + die("Unhandled request: %d", msg.hdr.request); + + /* cppcheck-suppress legacyUninitvar */ + if (!reply_requested && need_reply) { + msg.payload.u64 = 0; + msg.hdr.flags = 0; + msg.hdr.size = sizeof(msg.payload.u64); + msg.fd_num = 0; + reply_requested = true; + } + + if (reply_requested) + vu_send_reply(fd, &msg); +} diff --git a/vhost_user.h b/vhost_user.h new file mode 100644 index 000000000000..5af349ba58b8 --- /dev/null +++ b/vhost_user.h @@ -0,0 +1,208 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * vhost-user API, command management and virtio interface + * + * Copyright Red Hat + * Author: Laurent Vivier + */ + +/* some parts from subprojects/libvhost-user/libvhost-user.h */ + +#ifndef VHOST_USER_H +#define VHOST_USER_H + +#include "virtio.h" +#include "iov.h" + +#define VHOST_USER_F_PROTOCOL_FEATURES 30 + +#define VHOST_MEMORY_BASELINE_NREGIONS 8 + +/** + * enum vhost_user_protocol_feature - List of available vhost-user features + */ +enum vhost_user_protocol_feature { + VHOST_USER_PROTOCOL_F_MQ = 0, + VHOST_USER_PROTOCOL_F_LOG_SHMFD = 1, + VHOST_USER_PROTOCOL_F_RARP = 2, + VHOST_USER_PROTOCOL_F_REPLY_ACK = 3, + VHOST_USER_PROTOCOL_F_NET_MTU = 4, + VHOST_USER_PROTOCOL_F_BACKEND_REQ = 5, + VHOST_USER_PROTOCOL_F_CROSS_ENDIAN = 6, + VHOST_USER_PROTOCOL_F_CRYPTO_SESSION = 7, + VHOST_USER_PROTOCOL_F_PAGEFAULT = 8, + VHOST_USER_PROTOCOL_F_CONFIG = 9, + VHOST_USER_PROTOCOL_F_SLAVE_SEND_FD = 10, + VHOST_USER_PROTOCOL_F_HOST_NOTIFIER = 11, + VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD = 12, + VHOST_USER_PROTOCOL_F_INBAND_NOTIFICATIONS = 14, + VHOST_USER_PROTOCOL_F_CONFIGURE_MEM_SLOTS = 15, + + VHOST_USER_PROTOCOL_F_MAX +}; + +/** + * enum vhost_user_request - List of available vhost-user requests + */ +enum vhost_user_request { + VHOST_USER_NONE = 0, + VHOST_USER_GET_FEATURES = 1, + VHOST_USER_SET_FEATURES = 2, + VHOST_USER_SET_OWNER = 3, + VHOST_USER_RESET_OWNER = 4, + VHOST_USER_SET_MEM_TABLE = 5, + VHOST_USER_SET_LOG_BASE = 6, + VHOST_USER_SET_LOG_FD = 7, + VHOST_USER_SET_VRING_NUM = 8, + VHOST_USER_SET_VRING_ADDR = 9, + VHOST_USER_SET_VRING_BASE = 10, + VHOST_USER_GET_VRING_BASE = 11, + VHOST_USER_SET_VRING_KICK = 12, + VHOST_USER_SET_VRING_CALL = 13, + VHOST_USER_SET_VRING_ERR = 14, + VHOST_USER_GET_PROTOCOL_FEATURES = 15, + VHOST_USER_SET_PROTOCOL_FEATURES = 16, + VHOST_USER_GET_QUEUE_NUM = 17, + VHOST_USER_SET_VRING_ENABLE = 18, + VHOST_USER_SEND_RARP = 19, + VHOST_USER_NET_SET_MTU = 20, + VHOST_USER_SET_BACKEND_REQ_FD = 21, + VHOST_USER_IOTLB_MSG = 22, + VHOST_USER_SET_VRING_ENDIAN = 23, + VHOST_USER_GET_CONFIG = 24, + VHOST_USER_SET_CONFIG = 25, + VHOST_USER_CREATE_CRYPTO_SESSION = 26, + VHOST_USER_CLOSE_CRYPTO_SESSION = 27, + VHOST_USER_POSTCOPY_ADVISE = 28, + VHOST_USER_POSTCOPY_LISTEN = 29, + VHOST_USER_POSTCOPY_END = 30, + VHOST_USER_GET_INFLIGHT_FD = 31, + VHOST_USER_SET_INFLIGHT_FD = 32, + VHOST_USER_GPU_SET_SOCKET = 33, + VHOST_USER_VRING_KICK = 35, + VHOST_USER_GET_MAX_MEM_SLOTS = 36, + VHOST_USER_ADD_MEM_REG = 37, + VHOST_USER_REM_MEM_REG = 38, + VHOST_USER_MAX +}; + +/** + * struct vhost_user_header - vhost-user message header + * @request: Request type of the message + * @flags: Request flags + * @size: The following payload size + */ +struct vhost_user_header { + enum vhost_user_request request; + +#define VHOST_USER_VERSION_MASK 0x3 +#define VHOST_USER_REPLY_MASK (0x1 << 2) +#define VHOST_USER_NEED_REPLY_MASK (0x1 << 3) + uint32_t flags; + uint32_t size; +} __attribute__ ((__packed__)); + +/** + * struct vhost_user_memory_region - Front-end shared memory region information + * @guest_phys_addr: Guest physical address of the region + * @memory_size: Memory size + * @userspace_addr: front-end (QEMU) userspace address + * @mmap_offset: region offset in the shared memory area + */ +struct vhost_user_memory_region { + uint64_t guest_phys_addr; + uint64_t memory_size; + uint64_t userspace_addr; + uint64_t mmap_offset; +}; + +/** + * struct vhost_user_memory - List of all the shared memory regions + * @nregions: Number of memory regions + * @padding: Padding + * @regions: Memory regions list + */ +struct vhost_user_memory { + uint32_t nregions; + uint32_t padding; + struct vhost_user_memory_region regions[VHOST_MEMORY_BASELINE_NREGIONS]; +}; + +/** + * union vhost_user_payload - vhost-user message payload + * @u64: 64-bit payload + * @state: vring state payload + * @addr: vring addresses payload + * vhost_user_memory: Memory regions information payload + */ +union vhost_user_payload { +#define VHOST_USER_VRING_IDX_MASK 0xff +#define VHOST_USER_VRING_NOFD_MASK (0x1 << 8) + uint64_t u64; + struct vhost_vring_state state; + struct vhost_vring_addr addr; + struct vhost_user_memory memory; +}; + +/** + * struct vhost_user_msg - vhost-use message + * @hdr: Message header + * @payload: Message payload + * @fds: File descriptors associated with the message + * in the ancillary data. + * (shared memory or event file descriptors) + * @fd_num: Number of file descriptors + */ +struct vhost_user_msg { + struct vhost_user_header hdr; + union vhost_user_payload payload; + + int fds[VHOST_MEMORY_BASELINE_NREGIONS]; + int fd_num; +} __attribute__ ((__packed__)); +#define VHOST_USER_HDR_SIZE sizeof(struct vhost_user_header) + +/* index of the RX virtqueue */ +#define VHOST_USER_RX_QUEUE 0 +/* index of the TX virtqueue */ +#define VHOST_USER_TX_QUEUE 1 + +/* in case of multiqueue, the RX and TX queues are interleaved */ +#define VHOST_USER_IS_QUEUE_TX(n) (n % 2) +#define VHOST_USER_IS_QUEUE_RX(n) (!(n % 2)) + +/* Default virtio-net header for passt */ +#define VU_HEADER ((struct virtio_net_hdr){ \ + .flags = VIRTIO_NET_HDR_F_DATA_VALID, \ + .gso_type = VIRTIO_NET_HDR_GSO_NONE, \ +}) + +/** + * vu_queue_enabled - Return state of a virtqueue + * @vq: virtqueue to check + * + * Return: true if the virqueue is enabled, false otherwise + */ +/* cppcheck-suppress unusedFunction */ +static inline bool vu_queue_enabled(const struct vu_virtq *vq) +{ + return vq->enable; +} + +/** + * vu_queue_started - Return state of a virtqueue + * @vq: virtqueue to check + * + * Return: true if the virqueue is started, false otherwise + */ +/* cppcheck-suppress unusedFunction */ +static inline bool vu_queue_started(const struct vu_virtq *vq) +{ + return vq->started; +} + +void vu_print_capabilities(void); +void vu_init(struct ctx *c, struct vu_dev *vdev); +void vu_cleanup(struct vu_dev *vdev); +void vu_control_handler(struct vu_dev *vdev, int fd, uint32_t events); +#endif /* VHOST_USER_H */ diff --git a/virtio.h b/virtio.h index 94efeb049fbc..6410d60f9b3f 100644 --- a/virtio.h +++ b/virtio.h @@ -105,6 +105,7 @@ struct vu_dev_region { * @protocol_features: Vhost-user protocol features */ struct vu_dev { + struct ctx *context; uint32_t nregions; struct vu_dev_region regions[VHOST_USER_MAX_RAM_SLOTS]; struct vu_virtq vq[VHOST_USER_MAX_QUEUES]; -- 2.46.2

Export tcp_fill_headers[4|6]() and tcp_update_check_tcp[4|6](). They'll be needed by vhost-user. Signed-off-by: Laurent Vivier --- tcp.c | 30 +++++++++++++++--------------- tcp_internal.h | 15 +++++++++++++++ 2 files changed, 30 insertions(+), 15 deletions(-) diff --git a/tcp.c b/tcp.c index 9617b7ac2404..eae02b1647e3 100644 --- a/tcp.c +++ b/tcp.c @@ -761,9 +761,9 @@ static void tcp_sock_set_bufsize(const struct ctx *c, int s) * @iov_cnt: Length of the array * @l4offset: IPv4 payload offset in the iovec array */ -static void tcp_update_check_tcp4(const struct iphdr *iph, - const struct iovec *iov, int iov_cnt, - size_t l4offset) +void tcp_update_check_tcp4(const struct iphdr *iph, + const struct iovec *iov, int iov_cnt, + size_t l4offset) { uint16_t l4len = ntohs(iph->tot_len) - sizeof(struct iphdr); struct in_addr saddr = { .s_addr = iph->saddr }; @@ -813,9 +813,9 @@ static void tcp_update_check_tcp4(const struct iphdr *iph, * @iov_cnt: Length of the array * @l4offset: IPv6 payload offset in the iovec array */ -static void tcp_update_check_tcp6(const struct ipv6hdr *ip6h, - const struct iovec *iov, int iov_cnt, - size_t l4offset) +void tcp_update_check_tcp6(const struct ipv6hdr *ip6h, + const struct iovec *iov, int iov_cnt, + size_t l4offset) { uint16_t l4len = ntohs(ip6h->payload_len); size_t check_ofs; @@ -982,11 +982,11 @@ static void tcp_fill_header(struct tcphdr *th, * * Return: The IPv4 payload length, host order */ -static size_t tcp_fill_headers4(const struct tcp_tap_conn *conn, - struct tap_hdr *taph, - struct iphdr *iph, struct tcp_payload_t *bp, - size_t dlen, const uint16_t *check, - uint32_t seq, bool no_tcp_csum) +size_t tcp_fill_headers4(const struct tcp_tap_conn *conn, + struct tap_hdr *taph, + struct iphdr *iph, struct tcp_payload_t *bp, + size_t dlen, const uint16_t *check, + uint32_t seq, bool no_tcp_csum) { const struct flowside *tapside = TAPFLOW(conn); const struct in_addr *src4 = inany_v4(&tapside->oaddr); @@ -1034,10 +1034,10 @@ static size_t tcp_fill_headers4(const struct tcp_tap_conn *conn, * * Return: The IPv6 payload length, host order */ -static size_t tcp_fill_headers6(const struct tcp_tap_conn *conn, - struct tap_hdr *taph, - struct ipv6hdr *ip6h, struct tcp_payload_t *bp, - size_t dlen, uint32_t seq, bool no_tcp_csum) +size_t tcp_fill_headers6(const struct tcp_tap_conn *conn, + struct tap_hdr *taph, + struct ipv6hdr *ip6h, struct tcp_payload_t *bp, + size_t dlen, uint32_t seq, bool no_tcp_csum) { const struct flowside *tapside = TAPFLOW(conn); size_t l4len = dlen + sizeof(bp->th); diff --git a/tcp_internal.h b/tcp_internal.h index 2f74ffeff8f3..8e87f98b470f 100644 --- a/tcp_internal.h +++ b/tcp_internal.h @@ -118,6 +118,21 @@ void tcp_rst_do(const struct ctx *c, struct tcp_tap_conn *conn); tcp_rst_do(c, conn); \ } while (0) +void tcp_update_check_tcp4(const struct iphdr *iph, + const struct iovec *iov, int iov_cnt, + size_t l4offset); +void tcp_update_check_tcp6(const struct ipv6hdr *ip6h, + const struct iovec *iov, int iov_cnt, + size_t l4offset); +size_t tcp_fill_headers4(const struct tcp_tap_conn *conn, + struct tap_hdr *taph, + struct iphdr *iph, struct tcp_payload_t *bp, + size_t dlen, const uint16_t *check, + uint32_t seq, bool no_tcp_csum); +size_t tcp_fill_headers6(const struct tcp_tap_conn *conn, + struct tap_hdr *taph, + struct ipv6hdr *ip6h, struct tcp_payload_t *bp, + size_t dlen, uint32_t seq, bool no_tcp_csum); size_t tcp_l2_buf_fill_headers(const struct tcp_tap_conn *conn, struct iovec *iov, size_t dlen, const uint16_t *check, uint32_t seq, -- 2.46.2

add virtio and vhost-user functions to connect with QEMU. $ ./passt --vhost-user and # qemu-system-x86_64 ... -m 4G \ -object memory-backend-memfd,id=memfd0,share=on,size=4G \ -numa node,memdev=memfd0 \ -chardev socket,id=chr0,path=/tmp/passt_1.socket \ -netdev vhost-user,id=netdev0,chardev=chr0 \ -device virtio-net,mac=9a:2b:2c:2d:2e:2f,netdev=netdev0 \ ... Signed-off-by: Laurent Vivier --- Makefile | 6 +- conf.c | 22 ++- epoll_type.h | 4 + iov.c | 1 - isolation.c | 15 +- packet.c | 11 ++ packet.h | 8 +- passt.1 | 10 +- passt.c | 9 + passt.h | 6 + pcap.c | 1 - tap.c | 80 +++++++-- tap.h | 5 +- tcp.c | 7 + tcp_vu.c | 476 +++++++++++++++++++++++++++++++++++++++++++++++++++ tcp_vu.h | 12 ++ udp.c | 10 ++ udp_vu.c | 332 +++++++++++++++++++++++++++++++++++ udp_vu.h | 13 ++ vhost_user.c | 38 ++-- vhost_user.h | 4 +- virtio.c | 5 - vu_common.c | 327 +++++++++++++++++++++++++++++++++++ vu_common.h | 47 +++++ 24 files changed, 1393 insertions(+), 56 deletions(-) create mode 100644 tcp_vu.c create mode 100644 tcp_vu.h create mode 100644 udp_vu.c create mode 100644 udp_vu.h create mode 100644 vu_common.c create mode 100644 vu_common.h diff --git a/Makefile b/Makefile index 0e8ed60a0da1..1e8910dda1f4 100644 --- a/Makefile +++ b/Makefile @@ -54,7 +54,8 @@ FLAGS += -DDUAL_STACK_SOCKETS=$(DUAL_STACK_SOCKETS) PASST_SRCS = arch.c arp.c checksum.c conf.c dhcp.c dhcpv6.c flow.c fwd.c \ icmp.c igmp.c inany.c iov.c ip.c isolation.c lineread.c log.c mld.c \ ndp.c netlink.c packet.c passt.c pasta.c pcap.c pif.c tap.c tcp.c \ - tcp_buf.c tcp_splice.c udp.c udp_flow.c util.c vhost_user.c virtio.c + tcp_buf.c tcp_splice.c tcp_vu.c udp.c udp_flow.c udp_vu.c util.c \ + vhost_user.c virtio.c vu_common.c QRAP_SRCS = qrap.c SRCS = $(PASST_SRCS) $(QRAP_SRCS) @@ -64,7 +65,8 @@ PASST_HEADERS = arch.h arp.h checksum.h conf.h dhcp.h dhcpv6.h flow.h fwd.h \ flow_table.h icmp.h icmp_flow.h inany.h iov.h ip.h isolation.h \ lineread.h log.h ndp.h netlink.h packet.h passt.h pasta.h pcap.h pif.h \ siphash.h tap.h tcp.h tcp_buf.h tcp_conn.h tcp_internal.h tcp_splice.h \ - udp.h udp_flow.h util.h vhost_user.h virtio.h + tcp_vu.h udp.h udp_flow.h udp_internal.h udp_vu.h util.h vhost_user.h \ + virtio.h vu_common.h HEADERS = $(PASST_HEADERS) seccomp.h C := \#include \nstruct tcp_info x = { .tcpi_snd_wnd = 0 }; diff --git a/conf.c b/conf.c index 6e62510d6219..0098f7f55ed9 100644 --- a/conf.c +++ b/conf.c @@ -45,6 +45,7 @@ #include "lineread.h" #include "isolation.h" #include "log.h" +#include "vhost_user.h" /** * next_chunk - Return the next piece of a string delimited by a character @@ -762,9 +763,14 @@ static void usage(const char *name, FILE *f, int status) " default: same interface name as external one\n"); } else { fprintf(f, - " -s, --socket PATH UNIX domain socket path\n" + " -s, --socket, --socket-path PATH UNIX domain socket path\n" " default: probe free path starting from " UNIX_SOCK_PATH "\n", 1); + fprintf(f, + " --vhost-user Enable vhost-user mode\n" + " UNIX domain socket is provided by -s option\n" + " --print-capabilities print back-end capabilities in JSON format,\n" + " only meaningful for vhost-user mode\n"); } fprintf(f, @@ -1284,6 +1290,10 @@ void conf(struct ctx *c, int argc, char **argv) {"netns-only", no_argument, NULL, 20 }, {"map-host-loopback", required_argument, NULL, 21 }, {"map-guest-addr", required_argument, NULL, 22 }, + {"vhost-user", no_argument, NULL, 23 }, + /* vhost-user backend program convention */ + {"print-capabilities", no_argument, NULL, 24 }, + {"socket-path", required_argument, NULL, 's' }, { 0 }, }; const char *logname = (c->mode == MODE_PASTA) ? "pasta" : "passt"; @@ -1461,6 +1471,16 @@ void conf(struct ctx *c, int argc, char **argv) conf_nat(optarg, &c->ip4.map_guest_addr, &c->ip6.map_guest_addr, NULL); break; + case 23: + if (c->mode == MODE_PASTA) { + err("--vhost-user is for passt mode only"); + usage(argv[0], stdout, EXIT_SUCCESS); + } + c->mode = MODE_VU; + break; + case 24: + vu_print_capabilities(); + break; case 'd': c->debug = 1; c->quiet = 0; diff --git a/epoll_type.h b/epoll_type.h index 0ad1efa0ccec..f3ef41584757 100644 --- a/epoll_type.h +++ b/epoll_type.h @@ -36,6 +36,10 @@ enum epoll_type { EPOLL_TYPE_TAP_PASST, /* socket listening for qemu socket connections */ EPOLL_TYPE_TAP_LISTEN, + /* vhost-user command socket */ + EPOLL_TYPE_VHOST_CMD, + /* vhost-user kick event socket */ + EPOLL_TYPE_VHOST_KICK, EPOLL_NUM_TYPES, }; diff --git a/iov.c b/iov.c index 3f9e229a305f..3741db21790f 100644 --- a/iov.c +++ b/iov.c @@ -68,7 +68,6 @@ size_t iov_skip_bytes(const struct iovec *iov, size_t n, * * Returns: The number of bytes successfully copied. */ -/* cppcheck-suppress unusedFunction */ size_t iov_from_buf(const struct iovec *iov, size_t iov_cnt, size_t offset, const void *buf, size_t bytes) { diff --git a/isolation.c b/isolation.c index 45fba1e68b9d..c2a3c7b7911d 100644 --- a/isolation.c +++ b/isolation.c @@ -379,12 +379,19 @@ void isolate_postfork(const struct ctx *c) prctl(PR_SET_DUMPABLE, 0); - if (c->mode == MODE_PASTA) { - prog.len = (unsigned short)ARRAY_SIZE(filter_pasta); - prog.filter = filter_pasta; - } else { + switch (c->mode) { + case MODE_PASST: prog.len = (unsigned short)ARRAY_SIZE(filter_passt); prog.filter = filter_passt; + break; + case MODE_PASTA: + prog.len = (unsigned short)ARRAY_SIZE(filter_pasta); + prog.filter = filter_pasta; + break; + case MODE_VU: + prog.len = (unsigned short)ARRAY_SIZE(filter_vu); + prog.filter = filter_vu; + break; } if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) || diff --git a/packet.c b/packet.c index 37489961a37e..e5a78d079231 100644 --- a/packet.c +++ b/packet.c @@ -36,6 +36,17 @@ static int packet_check_range(const struct pool *p, size_t offset, size_t len, const char *start, const char *func, int line) { + if (p->buf_size == 0) { + int ret; + + ret = vu_packet_check_range((void *)p->buf, offset, len, start); + + if (ret == -1) + trace("cannot find region, %s:%i", func, line); + + return ret; + } + if (start < p->buf) { trace("packet start %p before buffer start %p, " "%s:%i", (void *)start, (void *)p->buf, func, line); diff --git a/packet.h b/packet.h index 8377dcf678bb..3f70e949c066 100644 --- a/packet.h +++ b/packet.h @@ -8,8 +8,10 @@ /** * struct pool - Generic pool of packets stored in a buffer - * @buf: Buffer storing packet descriptors - * @buf_size: Total size of buffer + * @buf: Buffer storing packet descriptors, + * a struct vu_dev_region array for passt vhost-user mode + * @buf_size: Total size of buffer, + * 0 for passt vhost-user mode * @size: Number of usable descriptors for the pool * @count: Number of used descriptors for the pool * @pkt: Descriptors: see macros below @@ -22,6 +24,8 @@ struct pool { struct iovec pkt[1]; }; +int vu_packet_check_range(void *buf, size_t offset, size_t len, + const char *start); void packet_add_do(struct pool *p, size_t len, const char *start, const char *func, int line); void *packet_get_do(const struct pool *p, const size_t idx, diff --git a/passt.1 b/passt.1 index 79d134dbe098..822714147be8 100644 --- a/passt.1 +++ b/passt.1 @@ -378,12 +378,20 @@ interface address are configured on a given host interface. .SS \fBpasst\fR-only options .TP -.BR \-s ", " \-\-socket " " \fIpath +.BR \-s ", " \-\-socket-path ", " \-\-socket " " \fIpath Path for UNIX domain socket used by \fBqemu\fR(1) or \fBqrap\fR(1) to connect to \fBpasst\fR. Default is to probe a free socket, not accepting connections, starting from \fI/tmp/passt_1.socket\fR to \fI/tmp/passt_64.socket\fR. +.TP +.BR \-\-vhost-user +Enable vhost-user. The vhost-user command socket is provided by \fB--socket\fR. + +.TP +.BR \-\-print-capabilities +Print back-end capabilities in JSON format, only meaningful for vhost-user mode. + .TP .BR \-F ", " \-\-fd " " \fIFD Pass a pre-opened, connected socket to \fBpasst\fR. Usually the socket is opened diff --git a/passt.c b/passt.c index 79093ee02d62..2d105e81218d 100644 --- a/passt.c +++ b/passt.c @@ -52,6 +52,7 @@ #include "arch.h" #include "log.h" #include "tcp_splice.h" +#include "vu_common.h" #define EPOLL_EVENTS 8 @@ -74,6 +75,8 @@ char *epoll_type_str[] = { [EPOLL_TYPE_TAP_PASTA] = "/dev/net/tun device", [EPOLL_TYPE_TAP_PASST] = "connected qemu socket", [EPOLL_TYPE_TAP_LISTEN] = "listening qemu socket", + [EPOLL_TYPE_VHOST_CMD] = "vhost-user command socket", + [EPOLL_TYPE_VHOST_KICK] = "vhost-user kick socket", }; static_assert(ARRAY_SIZE(epoll_type_str) == EPOLL_NUM_TYPES, "epoll_type_str[] doesn't match enum epoll_type"); @@ -360,6 +363,12 @@ loop: case EPOLL_TYPE_PING: icmp_sock_handler(&c, ref); break; + case EPOLL_TYPE_VHOST_CMD: + vu_control_handler(c.vdev, c.fd_tap, eventmask); + break; + case EPOLL_TYPE_VHOST_KICK: + vu_kick_cb(c.vdev, ref, &now); + break; default: /* Can't happen */ ASSERT(0); diff --git a/passt.h b/passt.h index 031c9b669cc4..a98f043c7e64 100644 --- a/passt.h +++ b/passt.h @@ -25,6 +25,8 @@ union epoll_ref; #include "fwd.h" #include "tcp.h" #include "udp.h" +#include "udp_vu.h" +#include "vhost_user.h" /* Default address for our end on the tap interface. Bit 0 of byte 0 must be 0 * (unicast) and bit 1 of byte 1 must be 1 (locally administered). Otherwise @@ -94,6 +96,7 @@ struct fqdn { enum passt_modes { MODE_PASST, MODE_PASTA, + MODE_VU, }; /** @@ -227,6 +230,7 @@ struct ip6_ctx { * @no_ra: Disable router advertisements * @low_wmem: Low probed net.core.wmem_max * @low_rmem: Low probed net.core.rmem_max + * @vdev: vhost-user device */ struct ctx { enum passt_modes mode; @@ -287,6 +291,8 @@ struct ctx { int low_wmem; int low_rmem; + + struct vu_dev *vdev; }; void proto_update_l2_buf(const unsigned char *eth_d, diff --git a/pcap.c b/pcap.c index 6ee6cdfd261a..718d6ad61732 100644 --- a/pcap.c +++ b/pcap.c @@ -140,7 +140,6 @@ void pcap_multiple(const struct iovec *iov, size_t frame_parts, unsigned int n, * @iovcnt: Number of buffers (@iov entries) * @offset: Offset of the L2 frame within the full data length */ -/* cppcheck-suppress unusedFunction */ void pcap_iov(const struct iovec *iov, size_t iovcnt, size_t offset) { struct timespec now; diff --git a/tap.c b/tap.c index 4b826fdf7adc..22d19f1833f7 100644 --- a/tap.c +++ b/tap.c @@ -58,6 +58,8 @@ #include "packet.h" #include "tap.h" #include "log.h" +#include "vhost_user.h" +#include "vu_common.h" /* IPv4 (plus ARP) and IPv6 message batches from tap/guest to IP handlers */ static PACKET_POOL_NOINIT(pool_tap4, TAP_MSGS, pkt_buf); @@ -78,16 +80,22 @@ void tap_send_single(const struct ctx *c, const void *data, size_t l2len) struct iovec iov[2]; size_t iovcnt = 0; - if (c->mode == MODE_PASST) { + switch (c->mode) { + case MODE_PASST: iov[iovcnt] = IOV_OF_LVALUE(vnet_len); iovcnt++; - } - - iov[iovcnt].iov_base = (void *)data; - iov[iovcnt].iov_len = l2len; - iovcnt++; + /* fall through */ + case MODE_PASTA: + iov[iovcnt].iov_base = (void *)data; + iov[iovcnt].iov_len = l2len; + iovcnt++; - tap_send_frames(c, iov, iovcnt, 1); + tap_send_frames(c, iov, iovcnt, 1); + break; + case MODE_VU: + vu_send_single(c, data, l2len); + break; + } } /** @@ -414,10 +422,18 @@ size_t tap_send_frames(const struct ctx *c, const struct iovec *iov, if (!nframes) return 0; - if (c->mode == MODE_PASTA) + switch (c->mode) { + case MODE_PASTA: m = tap_send_frames_pasta(c, iov, bufs_per_frame, nframes); - else + break; + case MODE_PASST: m = tap_send_frames_passt(c, iov, bufs_per_frame, nframes); + break; + case MODE_VU: + /* fall through */ + default: + ASSERT(0); + } if (m < nframes) debug("tap: failed to send %zu frames of %zu", @@ -976,7 +992,7 @@ void tap_add_packet(struct ctx *c, ssize_t l2len, char *p) * tap_sock_reset() - Handle closing or failure of connect AF_UNIX socket * @c: Execution context */ -static void tap_sock_reset(struct ctx *c) +void tap_sock_reset(struct ctx *c) { info("Client connection closed%s", c->one_off ? ", exiting" : ""); @@ -987,6 +1003,8 @@ static void tap_sock_reset(struct ctx *c) epoll_ctl(c->epollfd, EPOLL_CTL_DEL, c->fd_tap, NULL); close(c->fd_tap); c->fd_tap = -1; + if (c->mode == MODE_VU) + vu_cleanup(c->vdev); } /** @@ -1205,6 +1223,11 @@ static void tap_backend_show_hints(struct ctx *c) info("or qrap, for earlier qemu versions:"); info(" ./qrap 5 kvm ... -net socket,fd=5 -net nic,model=virtio"); break; + case MODE_VU: + info("You can start qemu with:"); + info(" kvm ... -chardev socket,id=chr0,path=%s -netdev vhost-user,id=netdev0,chardev=chr0 -device virtio-net,netdev=netdev0 -object memory-backend-memfd,id=memfd0,share=on,size=$RAMSIZE -numa node,memdev=memfd0\n", + c->sock_path); + break; } } @@ -1232,8 +1255,8 @@ static void tap_sock_unix_init(const struct ctx *c) */ void tap_listen_handler(struct ctx *c, uint32_t events) { - union epoll_ref ref = { .type = EPOLL_TYPE_TAP_PASST }; struct epoll_event ev = { 0 }; + union epoll_ref ref = { 0 }; int v = INT_MAX / 2; struct ucred ucred; socklen_t len; @@ -1273,6 +1296,10 @@ void tap_listen_handler(struct ctx *c, uint32_t events) trace("tap: failed to set SO_SNDBUF to %i", v); ref.fd = c->fd_tap; + if (c->mode == MODE_VU) + ref.type = EPOLL_TYPE_VHOST_CMD; + else + ref.type = EPOLL_TYPE_TAP_PASST; ev.events = EPOLLIN | EPOLLRDHUP; ev.data.u64 = ref.u64; epoll_ctl(c->epollfd, EPOLL_CTL_ADD, c->fd_tap, &ev); @@ -1339,7 +1366,7 @@ static void tap_sock_tun_init(struct ctx *c) * @base: Buffer base * @size Buffer size */ -static void tap_sock_update_pool(void *base, size_t size) +void tap_sock_update_pool(void *base, size_t size) { int i; @@ -1353,13 +1380,15 @@ static void tap_sock_update_pool(void *base, size_t size) } /** - * tap_backend_init() - Create and set up AF_UNIX socket or - * tuntap file descriptor + * tap_sock_init() - Create and set up AF_UNIX socket or tuntap file descriptor * @c: Execution context */ void tap_backend_init(struct ctx *c) { - tap_sock_update_pool(pkt_buf, sizeof(pkt_buf)); + if (c->mode == MODE_VU) + tap_sock_update_pool(NULL, 0); + else + tap_sock_update_pool(pkt_buf, sizeof(pkt_buf)); if (c->fd_tap != -1) { /* Passed as --fd */ struct epoll_event ev = { 0 }; @@ -1367,10 +1396,17 @@ void tap_backend_init(struct ctx *c) ASSERT(c->one_off); ref.fd = c->fd_tap; - if (c->mode == MODE_PASST) + switch (c->mode) { + case MODE_PASST: ref.type = EPOLL_TYPE_TAP_PASST; - else + break; + case MODE_PASTA: ref.type = EPOLL_TYPE_TAP_PASTA; + break; + case MODE_VU: + ref.type = EPOLL_TYPE_VHOST_CMD; + break; + } ev.events = EPOLLIN | EPOLLRDHUP; ev.data.u64 = ref.u64; @@ -1378,9 +1414,14 @@ void tap_backend_init(struct ctx *c) return; } - if (c->mode == MODE_PASTA) { + switch (c->mode) { + case MODE_PASTA: tap_sock_tun_init(c); - } else { + break; + case MODE_VU: + vu_init(c); + /* fall through */ + case MODE_PASST: tap_sock_unix_init(c); /* In passt mode, we don't know the guest's MAC address until it @@ -1388,6 +1429,7 @@ void tap_backend_init(struct ctx *c) * first packets will reach it. */ memset(&c->guest_mac, 0xff, sizeof(c->guest_mac)); + break; } tap_backend_show_hints(c); diff --git a/tap.h b/tap.h index 8728cc5c09c3..dfbd8b9ebd72 100644 --- a/tap.h +++ b/tap.h @@ -40,7 +40,8 @@ static inline struct iovec tap_hdr_iov(const struct ctx *c, */ static inline void tap_hdr_update(struct tap_hdr *thdr, size_t l2len) { - thdr->vnet_len = htonl(l2len); + if (thdr) + thdr->vnet_len = htonl(l2len); } void tap_udp4_send(const struct ctx *c, struct in_addr src, in_port_t sport, @@ -68,6 +69,8 @@ void tap_handler_pasta(struct ctx *c, uint32_t events, void tap_handler_passt(struct ctx *c, uint32_t events, const struct timespec *now); int tap_sock_unix_open(char *sock_path); +void tap_sock_reset(struct ctx *c); +void tap_sock_update_pool(void *base, size_t size); void tap_backend_init(struct ctx *c); void tap_flush_pools(void); void tap_handler(struct ctx *c, const struct timespec *now); diff --git a/tcp.c b/tcp.c index eae02b1647e3..fd2def0d8a39 100644 --- a/tcp.c +++ b/tcp.c @@ -304,6 +304,7 @@ #include "flow_table.h" #include "tcp_internal.h" #include "tcp_buf.h" +#include "tcp_vu.h" /* MSS rounding: see SET_MSS() */ #define MSS_DEFAULT 536 @@ -1328,6 +1329,9 @@ int tcp_prepare_flags(const struct ctx *c, struct tcp_tap_conn *conn, static int tcp_send_flag(const struct ctx *c, struct tcp_tap_conn *conn, int flags) { + if (c->mode == MODE_VU) + return tcp_vu_send_flag(c, conn, flags); + return tcp_buf_send_flag(c, conn, flags); } @@ -1721,6 +1725,9 @@ static int tcp_sock_consume(const struct tcp_tap_conn *conn, uint32_t ack_seq) */ static int tcp_data_from_sock(const struct ctx *c, struct tcp_tap_conn *conn) { + if (c->mode == MODE_VU) + return tcp_vu_data_from_sock(c, conn); + return tcp_buf_data_from_sock(c, conn); } diff --git a/tcp_vu.c b/tcp_vu.c new file mode 100644 index 000000000000..b903a0c60a2e --- /dev/null +++ b/tcp_vu.c @@ -0,0 +1,476 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* tcp_vu.c - TCP L2 vhost-user management functions + * + * Copyright Red Hat + * Author: Laurent Vivier + */ + +#include +#include +#include + +#include + +#include + +#include +#include + +#include "util.h" +#include "ip.h" +#include "passt.h" +#include "siphash.h" +#include "inany.h" +#include "vhost_user.h" +#include "tcp.h" +#include "pcap.h" +#include "flow.h" +#include "tcp_conn.h" +#include "flow_table.h" +#include "tcp_vu.h" +#include "tap.h" +#include "tcp_internal.h" +#include "checksum.h" +#include "vu_common.h" + +static struct iovec iov_vu[VIRTQUEUE_MAX_SIZE + 1]; +static struct vu_virtq_element elem[VIRTQUEUE_MAX_SIZE]; + +/** + * tcp_vu_l2_hdrlen() - return the size of the header in level 2 frame (TDP) + * @v6: Set for IPv6 packet + * + * Return: Return the size of the header + */ +static size_t tcp_vu_l2_hdrlen(bool v6) +{ + size_t l2_hdrlen; + + l2_hdrlen = sizeof(struct ethhdr) + sizeof(struct tcphdr); + + if (v6) + l2_hdrlen += sizeof(struct ipv6hdr); + else + l2_hdrlen += sizeof(struct iphdr); + + return l2_hdrlen; +} + +/** + * tcp_vu_update_check() - Calculate TCP checksum + * @tapside: Address information for one side of the flow + * @iov: Pointer to the array of IO vectors + * @iov_used: Length of the array + */ +static void tcp_vu_update_check(const struct flowside *tapside, + struct iovec *iov, int iov_used) +{ + char *base = iov[0].iov_base; + + if (inany_v4(&tapside->oaddr)) { + const struct iphdr *iph = vu_ip(base); + + tcp_update_check_tcp4(iph, iov, iov_used, + (char *)vu_payloadv4(base) - base); + } else { + const struct ipv6hdr *ip6h = vu_ip(base); + + tcp_update_check_tcp6(ip6h, iov, iov_used, + (char *)vu_payloadv6(base) - base); + } +} + +/** + * tcp_vu_send_flag() - Send segment with flags to vhost-user (no payload) + * @c: Execution context + * @conn: Connection pointer + * @flags: TCP flags: if not set, send segment only if ACK is due + * + * Return: negative error code on connection reset, 0 otherwise + */ +int tcp_vu_send_flag(const struct ctx *c, struct tcp_tap_conn *conn, int flags) +{ + struct vu_dev *vdev = c->vdev; + struct vu_virtq *vq = &vdev->vq[VHOST_USER_RX_QUEUE]; + const struct flowside *tapside = TAPFLOW(conn); + size_t l2len, l4len, optlen, hdrlen; + struct ethhdr *eh; + int elem_cnt; + int nb_ack; + int ret; + + hdrlen = tcp_vu_l2_hdrlen(CONN_V6(conn)); + + vu_init_elem(elem, iov_vu, 2); + + elem_cnt = vu_collect_one_frame(vdev, vq, elem, 1, + hdrlen + OPT_MSS_LEN + OPT_WS_LEN + 1, + 0); + if (elem_cnt < 1) + return 0; + + vu_set_vnethdr(vdev, &iov_vu[0], 1, 0); + + eh = vu_eth(iov_vu[0].iov_base); + + memcpy(eh->h_dest, c->guest_mac, sizeof(eh->h_dest)); + memcpy(eh->h_source, c->our_tap_mac, sizeof(eh->h_source)); + + if (CONN_V4(conn)) { + struct tcp_payload_t *payload; + struct iphdr *iph; + uint32_t seq; + + eh->h_proto = htons(ETH_P_IP); + + iph = vu_ip(iov_vu[0].iov_base); + *iph = (struct iphdr)L2_BUF_IP4_INIT(IPPROTO_TCP); + + payload = vu_payloadv4(iov_vu[0].iov_base); + memset(&payload->th, 0, sizeof(payload->th)); + payload->th.doff = offsetof(struct tcp_flags_t, opts) / 4; + payload->th.ack = 1; + + seq = conn->seq_to_tap; + ret = tcp_prepare_flags(c, conn, flags, &payload->th, + (char *)payload->data, &optlen); + if (ret <= 0) { + vu_queue_rewind(vq, 1); + return ret; + } + + l4len = tcp_fill_headers4(conn, NULL, iph, payload, optlen, + NULL, seq, true); + l2len = sizeof(*iph); + } else { + struct tcp_payload_t *payload; + struct ipv6hdr *ip6h; + uint32_t seq; + + eh->h_proto = htons(ETH_P_IPV6); + + ip6h = vu_ip(iov_vu[0].iov_base); + *ip6h = (struct ipv6hdr)L2_BUF_IP6_INIT(IPPROTO_TCP); + + payload = vu_payloadv6(iov_vu[0].iov_base); + memset(&payload->th, 0, sizeof(payload->th)); + payload->th.doff = offsetof(struct tcp_flags_t, opts) / 4; + payload->th.ack = 1; + + seq = conn->seq_to_tap; + ret = tcp_prepare_flags(c, conn, flags, &payload->th, + (char *)payload->data, &optlen); + if (ret <= 0) { + vu_queue_rewind(vq, 1); + return ret; + } + + l4len = tcp_fill_headers6(conn, NULL, ip6h, payload, optlen, + seq, true); + l2len = sizeof(*ip6h); + } + l2len += l4len + sizeof(struct ethhdr); + + elem[0].in_sg[0].iov_len = l2len + + sizeof(struct virtio_net_hdr_mrg_rxbuf); + if (*c->pcap) { + tcp_vu_update_check(tapside, &elem[0].in_sg[0], 1); + pcap_iov(&elem[0].in_sg[0], 1, + sizeof(struct virtio_net_hdr_mrg_rxbuf)); + } + nb_ack = 1; + + if (flags & DUP_ACK) { + elem_cnt = vu_collect_one_frame(vdev, vq, &elem[1], 1, l2len, + 0); + if (elem_cnt == 1) { + memcpy(elem[1].in_sg[0].iov_base, + elem[0].in_sg[0].iov_base, l2len); + vu_set_vnethdr(vdev, &elem[1].in_sg[0], 1, 0); + nb_ack++; + + if (*c->pcap) + pcap_iov(&elem[1].in_sg[0], 1, 0); + } + } + + vu_flush(vdev, vq, elem, nb_ack); + + return 0; +} + +/** tcp_vu_sock_recv() - Receive datastream from socket into vhost-user buffers + * @c: Execution context + * @conn: Connection pointer + * @v4: Set for IPv4 connections + * @fillsize: Number of bytes we can receive + * @datalen: Size of received data (output) + * + * Return: Number of iov entries used to store the data + */ +static ssize_t tcp_vu_sock_recv(const struct ctx *c, + struct tcp_tap_conn *conn, bool v4, + size_t fillsize, ssize_t *dlen) +{ + struct vu_dev *vdev = c->vdev; + struct vu_virtq *vq = &vdev->vq[VHOST_USER_RX_QUEUE]; + struct msghdr mh_sock = { 0 }; + uint16_t mss = MSS_GET(conn); + int s = conn->sock; + size_t l2_hdrlen; + int elem_cnt; + ssize_t ret; + + *dlen = 0; + + l2_hdrlen = tcp_vu_l2_hdrlen(!v4); + + vu_init_elem(elem, &iov_vu[1], VIRTQUEUE_MAX_SIZE); + + elem_cnt = vu_collect(vdev, vq, elem, VIRTQUEUE_MAX_SIZE, mss, + l2_hdrlen, fillsize); + if (elem_cnt < 0) { + tcp_rst(c, conn); + return -ENOMEM; + } + + mh_sock.msg_iov = iov_vu; + mh_sock.msg_iovlen = elem_cnt + 1; + + do + ret = recvmsg(s, &mh_sock, MSG_PEEK); + while (ret < 0 && errno == EINTR); + + if (ret < 0) { + vu_queue_rewind(vq, elem_cnt); + if (errno != EAGAIN && errno != EWOULDBLOCK) { + ret = -errno; + tcp_rst(c, conn); + } + return ret; + } + if (!ret) { + vu_queue_rewind(vq, elem_cnt); + + if ((conn->events & (SOCK_FIN_RCVD | TAP_FIN_SENT)) == SOCK_FIN_RCVD) { + int retf = tcp_vu_send_flag(c, conn, FIN | ACK); + if (retf) { + tcp_rst(c, conn); + return retf; + } + + conn_event(c, conn, TAP_FIN_SENT); + } + return 0; + } + + *dlen = ret; + + return elem_cnt; +} + +/** + * tcp_vu_prepare() - Prepare the packet header + * @c: Execution context + * @conn: Connection pointer + * @first: Pointer to the array of IO vectors + * @dlen: Packet data length + * @check: Checksum, if already known + */ +static void tcp_vu_prepare(const struct ctx *c, + struct tcp_tap_conn *conn, struct iovec *first, + size_t dlen, const uint16_t **check) +{ + const struct flowside *toside = TAPFLOW(conn); + char *base = first->iov_base; + struct ethhdr *eh; + + /* we guess the first iovec provided by the guest can embed + * all the headers needed by L2 frame + */ + + eh = vu_eth(base); + + memcpy(eh->h_dest, c->guest_mac, sizeof(eh->h_dest)); + memcpy(eh->h_source, c->our_tap_mac, sizeof(eh->h_source)); + + /* initialize header */ + if (inany_v4(&toside->eaddr) && inany_v4(&toside->oaddr)) { + struct tcp_payload_t *payload; + struct iphdr *iph; + + ASSERT(first[0].iov_len >= sizeof(struct virtio_net_hdr_mrg_rxbuf) + + sizeof(struct ethhdr) + sizeof(struct iphdr) + + sizeof(struct tcphdr)); + + eh->h_proto = htons(ETH_P_IP); + + iph = vu_ip(base); + *iph = (struct iphdr)L2_BUF_IP4_INIT(IPPROTO_TCP); + payload = vu_payloadv4(base); + memset(&payload->th, 0, sizeof(payload->th)); + payload->th.doff = offsetof(struct tcp_payload_t, data) / 4; + payload->th.ack = 1; + + tcp_fill_headers4(conn, NULL, iph, payload, dlen, + *check, conn->seq_to_tap, true); + *check = &iph->check; + } else { + struct tcp_payload_t *payload; + struct ipv6hdr *ip6h; + + ASSERT(first[0].iov_len >= sizeof(struct virtio_net_hdr_mrg_rxbuf) + + sizeof(struct ethhdr) + sizeof(struct ipv6hdr) + + sizeof(struct tcphdr)); + + eh->h_proto = htons(ETH_P_IPV6); + + ip6h = vu_ip(base); + *ip6h = (struct ipv6hdr)L2_BUF_IP6_INIT(IPPROTO_TCP); + + payload = vu_payloadv6(base); + memset(&payload->th, 0, sizeof(payload->th)); + payload->th.doff = offsetof(struct tcp_payload_t, data) / 4; + payload->th.ack = 1; + + tcp_fill_headers6(conn, NULL, ip6h, payload, dlen, + conn->seq_to_tap, true); + } +} + +/** + * tcp_vu_data_from_sock() - Handle new data from socket, queue to vhost-user, + * in window + * @c: Execution context + * @conn: Connection pointer + * + * Return: Negative on connection reset, 0 otherwise + */ +int tcp_vu_data_from_sock(const struct ctx *c, struct tcp_tap_conn *conn) +{ + uint32_t wnd_scaled = conn->wnd_from_tap << conn->ws_from_tap; + struct vu_dev *vdev = c->vdev; + struct vu_virtq *vq = &vdev->vq[VHOST_USER_RX_QUEUE]; + const struct flowside *tapside = TAPFLOW(conn); + uint16_t mss = MSS_GET(conn); + size_t l2_hdrlen, fillsize; + int i, iov_cnt, iov_used; + int v4 = CONN_V4(conn); + uint32_t already_sent = 0; + const uint16_t *check; + struct iovec *first; + int frame_size; + int num_buffers; + ssize_t len; + + if (!vu_queue_enabled(vq) || !vu_queue_started(vq)) { + flow_err(conn, + "Got packet, but RX virtqueue not usable yet"); + return 0; + } + + already_sent = conn->seq_to_tap - conn->seq_ack_from_tap; + + if (SEQ_LT(already_sent, 0)) { + /* RFC 761, section 2.1. */ + flow_trace(conn, "ACK sequence gap: ACK for %u, sent: %u", + conn->seq_ack_from_tap, conn->seq_to_tap); + conn->seq_to_tap = conn->seq_ack_from_tap; + already_sent = 0; + } + + if (!wnd_scaled || already_sent >= wnd_scaled) { + conn_flag(c, conn, STALLED); + conn_flag(c, conn, ACK_FROM_TAP_DUE); + return 0; + } + + /* Set up buffer descriptors we'll fill completely and partially. */ + + fillsize = wnd_scaled; + + if (peek_offset_cap) + already_sent = 0; + + iov_vu[0].iov_base = tcp_buf_discard; + iov_vu[0].iov_len = already_sent; + fillsize -= already_sent; + + /* collect the buffers from vhost-user and fill them with the + * data from the socket + */ + iov_cnt = tcp_vu_sock_recv(c, conn, v4, fillsize, &len); + if (iov_cnt <= 0) + return iov_cnt; + + len -= already_sent; + if (len <= 0) { + conn_flag(c, conn, STALLED); + vu_queue_rewind(vq, iov_cnt); + return 0; + } + + conn_flag(c, conn, ~STALLED); + + /* Likely, some new data was acked too. */ + tcp_update_seqack_wnd(c, conn, 0, NULL); + + /* initialize headers */ + l2_hdrlen = tcp_vu_l2_hdrlen(!v4); + iov_used = 0; + num_buffers = 0; + check = NULL; + frame_size = 0; + + /* iov_vu is an array of buffers and the buffer size can be + * smaller than the frame size we want to use but with + * num_buffer we can merge several virtio iov buffers in one packet + * we need only to set the packet headers in the first iov and + * num_buffer to the number of iov entries + */ + for (i = 0; i < iov_cnt && len; i++) { + + if (frame_size == 0) + first = &iov_vu[i + 1]; + + if (iov_vu[i + 1].iov_len > (size_t)len) + iov_vu[i + 1].iov_len = len; + + len -= iov_vu[i + 1].iov_len; + iov_used++; + + frame_size += iov_vu[i + 1].iov_len; + num_buffers++; + + if (frame_size >= mss || len == 0 || + i + 1 == iov_cnt || !vu_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) { + if (i + 1 == iov_cnt) + check = NULL; + + /* restore first iovec base: point to vnet header */ + vu_set_vnethdr(vdev, first, num_buffers, l2_hdrlen); + + tcp_vu_prepare(c, conn, first, frame_size, &check); + if (*c->pcap) { + tcp_vu_update_check(tapside, first, num_buffers); + pcap_iov(first, num_buffers, + sizeof(struct virtio_net_hdr_mrg_rxbuf)); + } + + conn->seq_to_tap += frame_size; + + frame_size = 0; + num_buffers = 0; + } + } + + /* release unused buffers */ + vu_queue_rewind(vq, iov_cnt - iov_used); + + /* send packets */ + vu_flush(vdev, vq, elem, iov_used); + + conn_flag(c, conn, ACK_FROM_TAP_DUE); + + return 0; +} diff --git a/tcp_vu.h b/tcp_vu.h new file mode 100644 index 000000000000..6ab6057f352a --- /dev/null +++ b/tcp_vu.h @@ -0,0 +1,12 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* Copyright Red Hat + * Author: Laurent Vivier + */ + +#ifndef TCP_VU_H +#define TCP_VU_H + +int tcp_vu_send_flag(const struct ctx *c, struct tcp_tap_conn *conn, int flags); +int tcp_vu_data_from_sock(const struct ctx *c, struct tcp_tap_conn *conn); + +#endif /*TCP_VU_H */ diff --git a/udp.c b/udp.c index 8fc5d8099310..1171d9d1a75b 100644 --- a/udp.c +++ b/udp.c @@ -628,6 +628,11 @@ void udp_listen_sock_handler(const struct ctx *c, union epoll_ref ref, uint32_t events, const struct timespec *now) { + if (c->mode == MODE_VU) { + udp_vu_listen_sock_handler(c, ref, events, now); + return; + } + udp_buf_listen_sock_handler(c, ref, events, now); } @@ -697,6 +702,11 @@ static void udp_buf_reply_sock_handler(const struct ctx *c, union epoll_ref ref, void udp_reply_sock_handler(const struct ctx *c, union epoll_ref ref, uint32_t events, const struct timespec *now) { + if (c->mode == MODE_VU) { + udp_vu_reply_sock_handler(c, ref, events, now); + return; + } + udp_buf_reply_sock_handler(c, ref, events, now); } diff --git a/udp_vu.c b/udp_vu.c new file mode 100644 index 000000000000..04fabf5d6800 --- /dev/null +++ b/udp_vu.c @@ -0,0 +1,332 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* udp_vu.c - UDP L2 vhost-user management functions + * + * Copyright Red Hat + * Author: Laurent Vivier + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "checksum.h" +#include "util.h" +#include "ip.h" +#include "siphash.h" +#include "inany.h" +#include "passt.h" +#include "pcap.h" +#include "log.h" +#include "vhost_user.h" +#include "udp_internal.h" +#include "flow.h" +#include "flow_table.h" +#include "udp_flow.h" +#include "udp_vu.h" +#include "vu_common.h" + +static struct iovec iov_vu [VIRTQUEUE_MAX_SIZE]; +static struct vu_virtq_element elem [VIRTQUEUE_MAX_SIZE]; + +/** + * udp_vu_l2_hdrlen() - return the size of the header in level 2 frame (UDP) + * @v6: Set for IPv6 packet + * + * Return: Return the size of the header + */ +static size_t udp_vu_l2_hdrlen(bool v6) +{ + size_t l2_hdrlen; + + l2_hdrlen = sizeof(struct ethhdr) + sizeof(struct udphdr); + + if (v6) + l2_hdrlen += sizeof(struct ipv6hdr); + else + l2_hdrlen += sizeof(struct iphdr); + + return l2_hdrlen; +} + +static int udp_vu_sock_init(int s, union sockaddr_inany *s_in) +{ + struct msghdr msg = { + .msg_name = s_in, + .msg_namelen = sizeof(union sockaddr_inany), + }; + + return recvmsg(s, &msg, MSG_PEEK | MSG_DONTWAIT); +} + +/** + * udp_vu_sock_recv() - Receive datagrams from socket into vhost-user buffers + * @c: Execution context + * @s: Socket to receive from + * @events: epoll events bitmap + * @v6: Set for IPv6 connections + * @datalen: Size of received data (output) + * + * Return: Number of iov entries used to store the datagram + */ +static int udp_vu_sock_recv(const struct ctx *c, int s, uint32_t events, + bool v6, ssize_t *dlen) +{ + struct vu_dev *vdev = c->vdev; + struct vu_virtq *vq = &vdev->vq[VHOST_USER_RX_QUEUE]; + int max_elem, iov_cnt, idx, iov_used; + struct msghdr msg = { 0 }; + size_t off, l2_hdrlen; + + ASSERT(!c->no_udp); + + if (!(events & EPOLLIN)) + return 0; + + /* compute L2 header length */ + + if (vu_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) + max_elem = VIRTQUEUE_MAX_SIZE; + else + max_elem = 1; + + l2_hdrlen = udp_vu_l2_hdrlen(v6); + + vu_init_elem(elem, iov_vu, max_elem); + + iov_cnt = vu_collect_one_frame(vdev, vq, elem, max_elem, + ETH_MAX_MTU - l2_hdrlen, + l2_hdrlen); + if (iov_cnt == 0) + return 0; + + msg.msg_iov = iov_vu; + msg.msg_iovlen = iov_cnt; + + *dlen = recvmsg(s, &msg, 0); + if (*dlen < 0) { + vu_queue_rewind(vq, iov_cnt); + return 0; + } + + /* count the numbers of buffer filled by recvmsg() */ + idx = iov_skip_bytes(iov_vu, iov_cnt, *dlen, &off); + + /* adjust last iov length */ + if (idx < iov_cnt) + iov_vu[idx].iov_len = off; + iov_used = idx + !!off; + + /* release unused buffers */ + vu_queue_rewind(vq, iov_cnt - iov_used); + + vu_set_vnethdr(vdev, &iov_vu[0], iov_used, l2_hdrlen); + + return iov_used; +} + +/** + * udp_vu_prepare() - Prepare the packet header + * @c: Execution context + * @toside: Address information for one side of the flow + * @datalen: Packet data length + * + * Return: Layer-4 length + */ +static size_t udp_vu_prepare(const struct ctx *c, + const struct flowside *toside, ssize_t dlen) +{ + struct ethhdr *eh; + size_t l4len; + + /* ethernet header */ + eh = vu_eth(iov_vu[0].iov_base); + + memcpy(eh->h_dest, c->guest_mac, sizeof(eh->h_dest)); + memcpy(eh->h_source, c->our_tap_mac, sizeof(eh->h_source)); + + /* initialize header */ + if (inany_v4(&toside->eaddr) && inany_v4(&toside->oaddr)) { + struct iphdr *iph = vu_ip(iov_vu[0].iov_base); + struct udp_payload_t *bp = vu_payloadv4(iov_vu[0].iov_base); + + eh->h_proto = htons(ETH_P_IP); + + *iph = (struct iphdr)L2_BUF_IP4_INIT(IPPROTO_UDP); + + l4len = udp_update_hdr4(iph, bp, toside, dlen, true); + } else { + struct ipv6hdr *ip6h = vu_ip(iov_vu[0].iov_base); + struct udp_payload_t *bp = vu_payloadv6(iov_vu[0].iov_base); + + eh->h_proto = htons(ETH_P_IPV6); + + *ip6h = (struct ipv6hdr)L2_BUF_IP6_INIT(IPPROTO_UDP); + + l4len = udp_update_hdr6(ip6h, bp, toside, dlen, true); + } + + return l4len; +} + +/** + * udp_vu_csum() - Calculate and set checksum for a UDP packet + * @toside: ddress information for one side of the flow + * @l4len: IPv4 Payload length + * @iov_used: Length of the array + */ +static void udp_vu_csum(const struct flowside *toside, int iov_used) +{ + const struct in_addr *src4 = inany_v4(&toside->oaddr); + const struct in_addr *dst4 = inany_v4(&toside->eaddr); + char *base = iov_vu[0].iov_base; + struct udp_payload_t *bp; + + if (src4 && dst4) { + bp = vu_payloadv4(base); + csum_udp4(&bp->uh, *src4, *dst4, iov_vu, iov_used, + (char *)&bp->data - base); + } else { + bp = vu_payloadv6(base); + csum_udp6(&bp->uh, &toside->oaddr.a6, &toside->eaddr.a6, + iov_vu, iov_used, (char *)&bp->data - base); + } +} + +/** + * udp_vu_listen_sock_handler() - Handle new data from socket + * @c: Execution context + * @ref: epoll reference + * @events: epoll events bitmap + * @now: Current timestamp + */ +void udp_vu_listen_sock_handler(const struct ctx *c, union epoll_ref ref, + uint32_t events, const struct timespec *now) +{ + struct vu_dev *vdev = c->vdev; + struct vu_virtq *vq = &vdev->vq[VHOST_USER_RX_QUEUE]; + int i; + + if (udp_sock_errs(c, ref.fd, events) < 0) { + err("UDP: Unrecoverable error on listening socket:" + " (%s port %hu)", pif_name(ref.udp.pif), ref.udp.port); + return; + } + + for (i = 0; i < UDP_MAX_FRAMES; i++) { + const struct flowside *toside; + union sockaddr_inany s_in; + flow_sidx_t batchsidx; + uint8_t batchpif; + ssize_t dlen; + int iov_used; + bool v6; + + if (udp_vu_sock_init(ref.fd, &s_in) < 0) + break; + + batchsidx = udp_flow_from_sock(c, ref, &s_in, now); + batchpif = pif_at_sidx(batchsidx); + + if (batchpif != PIF_TAP) { + if (flow_sidx_valid(batchsidx)) { + flow_sidx_t fromsidx = flow_sidx_opposite(batchsidx); + struct udp_flow *uflow = udp_at_sidx(batchsidx); + + flow_err(uflow, + "No support for forwarding UDP from %s to %s", + pif_name(pif_at_sidx(fromsidx)), + pif_name(batchpif)); + } else { + debug("Discarding 1 datagram without flow"); + } + + continue; + } + + toside = flowside_at_sidx(batchsidx); + + v6 = !(inany_v4(&toside->eaddr) && inany_v4(&toside->oaddr)); + + iov_used = udp_vu_sock_recv(c, ref.fd, events, v6, &dlen); + if (iov_used <= 0) + break; + + udp_vu_prepare(c, toside, dlen); + if (*c->pcap) { + udp_vu_csum(toside, iov_used); + pcap_iov(iov_vu, iov_used, + sizeof(struct virtio_net_hdr_mrg_rxbuf)); + } + vu_flush(vdev, vq, elem, iov_used); + } +} + +/** + * udp_vu_reply_sock_handler() - Handle new data from flow specific socket + * @c: Execution context + * @ref: epoll reference + * @events: epoll events bitmap + * @now: Current timestamp + */ +void udp_vu_reply_sock_handler(const struct ctx *c, union epoll_ref ref, + uint32_t events, const struct timespec *now) +{ + flow_sidx_t tosidx = flow_sidx_opposite(ref.flowside); + const struct flowside *toside = flowside_at_sidx(tosidx); + struct udp_flow *uflow = udp_at_sidx(ref.flowside); + int from_s = uflow->s[ref.flowside.sidei]; + struct vu_dev *vdev = c->vdev; + struct vu_virtq *vq = &vdev->vq[VHOST_USER_RX_QUEUE]; + int i; + + ASSERT(!c->no_udp); + + if (udp_sock_errs(c, from_s, events) < 0) { + flow_err(uflow, "Unrecoverable error on reply socket"); + flow_err_details(uflow); + udp_flow_close(c, uflow); + return; + } + + for (i = 0; i < UDP_MAX_FRAMES; i++) { + uint8_t topif = pif_at_sidx(tosidx); + ssize_t dlen; + int iov_used; + bool v6; + + ASSERT(uflow); + + if (topif != PIF_TAP) { + uint8_t frompif = pif_at_sidx(ref.flowside); + + flow_err(uflow, + "No support for forwarding UDP from %s to %s", + pif_name(frompif), pif_name(topif)); + continue; + } + + v6 = !(inany_v4(&toside->eaddr) && inany_v4(&toside->oaddr)); + + iov_used = udp_vu_sock_recv(c, from_s, events, v6, &dlen); + if (iov_used <= 0) + break; + flow_trace(uflow, "Received 1 datagram on reply socket"); + uflow->ts = now->tv_sec; + + udp_vu_prepare(c, toside, dlen); + if (*c->pcap) { + udp_vu_csum(toside, iov_used); + pcap_iov(iov_vu, iov_used, + sizeof(struct virtio_net_hdr_mrg_rxbuf)); + } + vu_flush(vdev, vq, elem, iov_used); + } +} diff --git a/udp_vu.h b/udp_vu.h new file mode 100644 index 000000000000..ba7018d3bf01 --- /dev/null +++ b/udp_vu.h @@ -0,0 +1,13 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* Copyright Red Hat + * Author: Laurent Vivier + */ + +#ifndef UDP_VU_H +#define UDP_VU_H + +void udp_vu_listen_sock_handler(const struct ctx *c, union epoll_ref ref, + uint32_t events, const struct timespec *now); +void udp_vu_reply_sock_handler(const struct ctx *c, union epoll_ref ref, + uint32_t events, const struct timespec *now); +#endif /* UDP_VU_H */ diff --git a/vhost_user.c b/vhost_user.c index 952e97efaae8..13decd33dacc 100644 --- a/vhost_user.c +++ b/vhost_user.c @@ -48,12 +48,13 @@ /* vhost-user version we are compatible with */ #define VHOST_USER_VERSION 1 +static struct vu_dev vdev_storage; + /** * vu_print_capabilities() - print vhost-user capabilities * this is part of the vhost-user backend * convention. */ -/* cppcheck-suppress unusedFunction */ void vu_print_capabilities(void) { info("{"); @@ -163,9 +164,7 @@ static void vmsg_close_fds(const struct vhost_user_msg *vmsg) */ static void vu_remove_watch(const struct vu_dev *vdev, int fd) { - /* Placeholder to add passt related code */ - (void)vdev; - (void)fd; + epoll_ctl(vdev->context->epollfd, EPOLL_CTL_DEL, fd, NULL); } /** @@ -426,7 +425,6 @@ static bool map_ring(struct vu_dev *vdev, struct vu_virtq *vq) * * Return: 0 if the zone is in a mapped memory region, -1 otherwise */ -/* cppcheck-suppress unusedFunction */ int vu_packet_check_range(void *buf, size_t offset, size_t len, const char *start) { @@ -516,6 +514,14 @@ static bool vu_set_mem_table_exec(struct vu_dev *vdev, } } + /* As vu_packet_check_range() has no access to the number of + * memory regions, mark the end of the array with mmap_addr = 0 + */ + ASSERT(vdev->nregions < VHOST_USER_MAX_RAM_SLOTS - 1); + vdev->regions[vdev->nregions].mmap_addr = 0; + + tap_sock_update_pool(vdev->regions, 0); + return false; } @@ -644,9 +650,12 @@ static bool vu_get_vring_base_exec(struct vu_dev *vdev, */ static void vu_set_watch(const struct vu_dev *vdev, int fd) { - /* Placeholder to add passt related code */ - (void)vdev; - (void)fd; + union epoll_ref ref = { .type = EPOLL_TYPE_VHOST_KICK, .fd = fd }; + struct epoll_event ev = { 0 }; + + ev.data.u64 = ref.u64; + ev.events = EPOLLIN; + epoll_ctl(vdev->context->epollfd, EPOLL_CTL_ADD, fd, &ev); } /** @@ -858,14 +867,14 @@ static bool vu_set_vring_enable_exec(struct vu_dev *vdev, * @c: execution context * @vdev: vhost-user device */ -/* cppcheck-suppress unusedFunction */ -void vu_init(struct ctx *c, struct vu_dev *vdev) +void vu_init(struct ctx *c) { int i; - vdev->context = c; + c->vdev = &vdev_storage; + c->vdev->context = c; for (i = 0; i < VHOST_USER_MAX_QUEUES; i++) { - vdev->vq[i] = (struct vu_virtq){ + c->vdev->vq[i] = (struct vu_virtq){ .call_fd = -1, .kick_fd = -1, .err_fd = -1, @@ -878,7 +887,6 @@ void vu_init(struct ctx *c, struct vu_dev *vdev) * vu_cleanup() - Reset vhost-user device * @vdev: vhost-user device */ -/* cppcheck-suppress unusedFunction */ void vu_cleanup(struct vu_dev *vdev) { unsigned int i; @@ -925,8 +933,7 @@ void vu_cleanup(struct vu_dev *vdev) */ static void vu_sock_reset(struct vu_dev *vdev) { - /* Placeholder to add passt related code */ - (void)vdev; + tap_sock_reset(vdev->context); } static bool (*vu_handle[VHOST_USER_MAX])(struct vu_dev *vdev, @@ -954,7 +961,6 @@ static bool (*vu_handle[VHOST_USER_MAX])(struct vu_dev *vdev, * @fd: vhost-user message socket * @events: epoll events */ -/* cppcheck-suppress unusedFunction */ void vu_control_handler(struct vu_dev *vdev, int fd, uint32_t events) { struct vhost_user_msg msg = { 0 }; diff --git a/vhost_user.h b/vhost_user.h index 5af349ba58b8..464ba21e962f 100644 --- a/vhost_user.h +++ b/vhost_user.h @@ -183,7 +183,6 @@ struct vhost_user_msg { * * Return: true if the virqueue is enabled, false otherwise */ -/* cppcheck-suppress unusedFunction */ static inline bool vu_queue_enabled(const struct vu_virtq *vq) { return vq->enable; @@ -195,14 +194,13 @@ static inline bool vu_queue_enabled(const struct vu_virtq *vq) * * Return: true if the virqueue is started, false otherwise */ -/* cppcheck-suppress unusedFunction */ static inline bool vu_queue_started(const struct vu_virtq *vq) { return vq->started; } void vu_print_capabilities(void); -void vu_init(struct ctx *c, struct vu_dev *vdev); +void vu_init(struct ctx *c); void vu_cleanup(struct vu_dev *vdev); void vu_control_handler(struct vu_dev *vdev, int fd, uint32_t events); #endif /* VHOST_USER_H */ diff --git a/virtio.c b/virtio.c index 380590afbca3..0598ff479858 100644 --- a/virtio.c +++ b/virtio.c @@ -328,7 +328,6 @@ static bool vring_can_notify(const struct vu_dev *dev, struct vu_virtq *vq) * @dev: Vhost-user device * @vq: Virtqueue */ -/* cppcheck-suppress unusedFunction */ void vu_queue_notify(const struct vu_dev *dev, struct vu_virtq *vq) { if (!vq->vring.avail) @@ -504,7 +503,6 @@ static int vu_queue_map_desc(struct vu_dev *dev, struct vu_virtq *vq, unsigned i * * Return: -1 if there is an error, 0 otherwise */ -/* cppcheck-suppress unusedFunction */ int vu_queue_pop(struct vu_dev *dev, struct vu_virtq *vq, struct vu_virtq_element *elem) { unsigned int head; @@ -565,7 +563,6 @@ void vu_queue_unpop(struct vu_virtq *vq) * @vq: Virtqueue * @num: Number of element to unpop */ -/* cppcheck-suppress unusedFunction */ bool vu_queue_rewind(struct vu_virtq *vq, unsigned int num) { if (num > vq->inuse) @@ -621,7 +618,6 @@ void vu_queue_fill_by_index(struct vu_virtq *vq, unsigned int index, * @len: Size of the element * @idx: Used ring entry index */ -/* cppcheck-suppress unusedFunction */ void vu_queue_fill(struct vu_virtq *vq, const struct vu_virtq_element *elem, unsigned int len, unsigned int idx) { @@ -645,7 +641,6 @@ static inline void vring_used_idx_set(struct vu_virtq *vq, uint16_t val) * @vq: Virtqueue * @count: Number of entry to flush */ -/* cppcheck-suppress unusedFunction */ void vu_queue_flush(struct vu_virtq *vq, unsigned int count) { uint16_t old, new; diff --git a/vu_common.c b/vu_common.c new file mode 100644 index 000000000000..38d5d8eb4fa3 --- /dev/null +++ b/vu_common.c @@ -0,0 +1,327 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* Copyright Red Hat + * Author: Laurent Vivier + * + * common_vu.c - vhost-user common UDP and TCP functions + */ + +#include +#include +#include +#include + +#include "util.h" +#include "passt.h" +#include "tap.h" +#include "vhost_user.h" +#include "pcap.h" +#include "vu_common.h" + +/** + * vu_init_elem() - initialize an array of virtqueue element with 1 iov in each + * @elem: Array of virtqueue element to initialize + * @iov: Array of iovec to assign to virtqueue element + * @elem_cnt: Number of virtqueue element + */ +void vu_init_elem(struct vu_virtq_element *elem, struct iovec *iov, int elem_cnt) +{ + int i; + + for (i = 0; i < elem_cnt; i++) { + elem[i].out_num = 0; + elem[i].out_sg = NULL; + elem[i].in_num = 1; + elem[i].in_sg = &iov[i]; + } +} + +/** + * vu_collect_one_frame() - collect virtio buffers from a given virtqueue for + * one frame + * @vdev: vhost-user device + * @vq: virtqueue to collect from + * @elem: Array of virtqueue element + * each element must be initialized with one iovec entry + * in the in_sg array. + * @max_elem: Number of virtqueue element in the array + * @size: Maximum size of the data in the frame + * @hdrlen: Size of the frame header + */ +int vu_collect_one_frame(struct vu_dev *vdev, struct vu_virtq *vq, + struct vu_virtq_element *elem, int max_elem, + size_t size, size_t hdrlen) +{ + return vu_collect(vdev, vq, elem, max_elem, size, hdrlen, size); +} + +/** + * vu_collect() - collect virtio buffers from a given virtqueue + * @vdev: vhost-user device + * @vq: virtqueue to collect from + * @elem: Array of virtqueue element + * each element must be initialized with one iovec entry + * in the in_sg array. + * @max_elem: Number of virtqueue element in the array + * @max_frame_size: Maximum size of the data in the frame + * @hdrlen: Size of the frame header + * @size: Total size of the buffers we need to collect + * (if size > max_frame_size, we collect several frame) + */ +int vu_collect(struct vu_dev *vdev, struct vu_virtq *vq, + struct vu_virtq_element *elem, int max_elem, + size_t max_frame_size, size_t hdrlen, size_t size) +{ + size_t frame_size = 0; + int elem_cnt = 0; + + /* header is at least virtio_net_hdr_mrg_rxbuf */ + hdrlen += sizeof(struct virtio_net_hdr_mrg_rxbuf); + + while (size > 0 && elem_cnt < max_elem) { + struct iovec *iov; + int ret; + + ret = vu_queue_pop(vdev, vq, &elem[elem_cnt]); + if (ret < 0) + break; + + if (elem[elem_cnt].in_num < 1) { + warn("virtio-net receive queue contains no in buffers"); + vu_queue_detach_element(vq); + break; + } + + iov = &elem[elem_cnt].in_sg[0]; + + ASSERT(iov->iov_len >= hdrlen); + + if (frame_size == 0) { + /* this is the iovec that will contain frame headers */ + iov->iov_base = (char *)iov->iov_base + hdrlen; + iov->iov_len -= hdrlen; + } + + if (iov->iov_len > size) + iov->iov_len = size; + + frame_size += iov->iov_len; + + if (frame_size >= max_frame_size) { + /* if the frame size is greater than maximum size + * we need to start a new frame + */ + iov->iov_len -= frame_size - max_frame_size; + frame_size = 0; + } else if (!vu_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) { + /* if we don't have feature F_MRG_RXBUF, + * the frame cannot be spread over several + * virtqueue element + */ + frame_size = 0; + } + + size -= iov->iov_len; + elem_cnt++; + } + + return elem_cnt; +} + +/** + * vu_set_vnethdr() - set virtio-net headers in a given iovec + * @vdev: vhost-user device + * @iov: One iovec to initialize + * @num_buffers: Number of guest buffers of the frame + * @hdrlen: Size of the frame header + */ +void vu_set_vnethdr(const struct vu_dev *vdev, struct iovec *iov, + int num_buffers, size_t hdrlen) +{ + struct virtio_net_hdr_mrg_rxbuf *vnethdr; + + /* header is at least virtio_net_hdr_mrg_rxbuf */ + hdrlen += sizeof(struct virtio_net_hdr_mrg_rxbuf); + + /* NOLINTNEXTLINE(clang-analyzer-core.UndefinedBinaryOperatorResult) */ + iov->iov_base = (char *)iov->iov_base - hdrlen; + iov->iov_len += hdrlen; + + vnethdr = iov->iov_base; + vnethdr->hdr = VU_HEADER; + if (vu_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) + vnethdr->num_buffers = htole16(num_buffers); +} + +/** + * vu_flush() - flush all the collected buffers to the vhost-user interface + * @vdev: vhost-user device + * @vq: vhost-user virtqueue + * @elem: virtqueue element array to send back to the virqueue + * @iov_used: Length of the array + */ +void vu_flush(const struct vu_dev *vdev, struct vu_virtq *vq, + struct vu_virtq_element *elem, int elem_cnt) +{ + int i; + + for (i = 0; i < elem_cnt; i++) + vu_queue_fill(vq, &elem[i], elem[i].in_sg[0].iov_len, i); + + vu_queue_flush(vq, elem_cnt); + vu_queue_notify(vdev, vq); +} + +/** + * vu_handle_tx() - Receive data from the TX virtqueue + * @vdev: vhost-user device + * @index: index of the virtqueue + * @now: Current timestamp + */ +static void vu_handle_tx(struct vu_dev *vdev, int index, + const struct timespec *now) +{ + struct vu_virtq_element elem[VIRTQUEUE_MAX_SIZE]; + struct iovec out_sg[VIRTQUEUE_MAX_SIZE]; + struct vu_virtq *vq = &vdev->vq[index]; + int hdrlen = sizeof(struct virtio_net_hdr_mrg_rxbuf); + int out_sg_count; + int count; + + if (!VHOST_USER_IS_QUEUE_TX(index)) { + debug("vhost-user: index %d is not a TX queue", index); + return; + } + + tap_flush_pools(); + + count = 0; + out_sg_count = 0; + while (count < VIRTQUEUE_MAX_SIZE) { + int ret; + + elem[count].out_num = 1; + elem[count].out_sg = &out_sg[out_sg_count]; + elem[count].in_num = 0; + elem[count].in_sg = NULL; + ret = vu_queue_pop(vdev, vq, &elem[count]); + if (ret < 0) + break; + out_sg_count += elem[count].out_num; + + if (elem[count].out_num < 1) { + debug("virtio-net header not in first element"); + break; + } + ASSERT(elem[count].out_num == 1); + + tap_add_packet(vdev->context, + elem[count].out_sg[0].iov_len - hdrlen, + (char *)elem[count].out_sg[0].iov_base + hdrlen); + count++; + } + tap_handler(vdev->context, now); + + if (count) { + int i; + + for (i = 0; i < count; i++) + vu_queue_fill(vq, &elem[i], 0, i); + vu_queue_flush(vq, count); + vu_queue_notify(vdev, vq); + } +} + +/** + * vu_kick_cb() - Called on a kick event to start to receive data + * @vdev: vhost-user device + * @ref: epoll reference information + * @now: Current timestamp + */ +void vu_kick_cb(struct vu_dev *vdev, union epoll_ref ref, + const struct timespec *now) +{ + eventfd_t kick_data; + ssize_t rc; + int idx; + + for (idx = 0; idx < VHOST_USER_MAX_QUEUES; idx++) { + if (vdev->vq[idx].kick_fd == ref.fd) + break; + } + + if (idx == VHOST_USER_MAX_QUEUES) + return; + + rc = eventfd_read(ref.fd, &kick_data); + if (rc == -1) + die_perror("vhost-user kick eventfd_read()"); + + debug("vhost-user: ot kick_data: %016"PRIx64" idx:%d", + kick_data, idx); + if (VHOST_USER_IS_QUEUE_TX(idx)) + vu_handle_tx(vdev, idx, now); +} + +/** + * vu_send_single() - Send a buffer to the front-end using the RX virtqueue + * @c: execution context + * @buf: address of the buffer + * @size: size of the buffer + * + * Return: number of bytes sent, -1 if there is an error + */ +int vu_send_single(const struct ctx *c, const void *buf, size_t size) +{ + struct vu_dev *vdev = c->vdev; + struct vu_virtq *vq = &vdev->vq[VHOST_USER_RX_QUEUE]; + struct vu_virtq_element elem[VIRTQUEUE_MAX_SIZE]; + struct iovec in_sg[VIRTQUEUE_MAX_SIZE]; + size_t total; + int elem_cnt, max_elem; + int i; + + debug("vu_send_single size %zu", size); + + if (!vu_queue_enabled(vq) || !vu_queue_started(vq)) { + err("Got packet, but no available descriptors on RX virtq."); + return 0; + } + + if (vu_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) + max_elem = VIRTQUEUE_MAX_SIZE; + else + max_elem = 1; + + vu_init_elem(elem, in_sg, max_elem); + + elem_cnt = vu_collect_one_frame(vdev, vq, elem, max_elem, size, + 0); + total = iov_size(in_sg, elem_cnt); + if (total < size) { + debug("vu_send_single: no space to send the data " + "elem_cnt %d iov_size %zd", elem_cnt, total); + goto err; + } + + vu_set_vnethdr(vdev, in_sg, elem_cnt, 0); + + /* copy data from the buffer to the iovec */ + iov_from_buf(in_sg, elem_cnt, sizeof(struct virtio_net_hdr_mrg_rxbuf), + buf, size); + + if (*c->pcap) { + pcap_iov(in_sg, elem_cnt, + sizeof(struct virtio_net_hdr_mrg_rxbuf)); + } + + vu_flush(vdev, vq, elem, elem_cnt); + + debug("vhost-user sent %zu", total); + + return total; +err: + for (i = 0; i < elem_cnt; i++) + vu_queue_detach_element(vq); + + return 0; +} diff --git a/vu_common.h b/vu_common.h new file mode 100644 index 000000000000..a6f7fa9467cb --- /dev/null +++ b/vu_common.h @@ -0,0 +1,47 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later + * Copyright Red Hat + * Author: Laurent Vivier + * + * vhost-user common UDP and TCP functions + */ + +#ifndef VU_COMMON_H +#define VU_COMMON_H +#include + +static inline void *vu_eth(void *base) +{ + return ((char *)base + sizeof(struct virtio_net_hdr_mrg_rxbuf)); +} + +static inline void *vu_ip(void *base) +{ + return (struct ethhdr *)vu_eth(base) + 1; +} + +static inline void *vu_payloadv4(void *base) +{ + return (struct iphdr *)vu_ip(base) + 1; +} + +static inline void *vu_payloadv6(void *base) +{ + return (struct ipv6hdr *)vu_ip(base) + 1; +} + +void vu_init_elem(struct vu_virtq_element *elem, struct iovec *iov, + int elem_cnt); +int vu_collect_one_frame(struct vu_dev *vdev, struct vu_virtq *vq, + struct vu_virtq_element *elem, int max_elem, + size_t size, size_t hdrlen); +int vu_collect(struct vu_dev *vdev, struct vu_virtq *vq, + struct vu_virtq_element *elem, int max_elem, + size_t max_frame_size, size_t hdrlen, size_t size); +void vu_set_vnethdr(const struct vu_dev *vdev, struct iovec *iov, + int num_buffers, size_t hdrlen); +void vu_flush(const struct vu_dev *vdev, struct vu_virtq *vq, + struct vu_virtq_element *elem, int elem_cnt); +void vu_kick_cb(struct vu_dev *vdev, union epoll_ref ref, + const struct timespec *now); +int vu_send_single(const struct ctx *c, const void *buf, size_t size); +#endif /* VU_COMMON_H */ -- 2.46.2