When vhost is bound to a backend device, we need to stop polling it when vhost is started, and restart polling when vhost is stopped. Add an API for that for use by vhost, and implement in tap backend. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
458 lines
12 KiB
C
458 lines
12 KiB
C
/*
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* QEMU System Emulator
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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* Copyright (c) 2009 Red Hat, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "net/tap.h"
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#include "config-host.h"
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#include <signal.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include "net.h"
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#include "sysemu.h"
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#include "qemu-char.h"
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#include "qemu-common.h"
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#include "net/tap-linux.h"
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/* Maximum GSO packet size (64k) plus plenty of room for
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* the ethernet and virtio_net headers
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*/
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#define TAP_BUFSIZE (4096 + 65536)
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typedef struct TAPState {
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VLANClientState nc;
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int fd;
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char down_script[1024];
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char down_script_arg[128];
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uint8_t buf[TAP_BUFSIZE];
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unsigned int read_poll : 1;
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unsigned int write_poll : 1;
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unsigned int has_vnet_hdr : 1;
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unsigned int using_vnet_hdr : 1;
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unsigned int has_ufo: 1;
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} TAPState;
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static int launch_script(const char *setup_script, const char *ifname, int fd);
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static int tap_can_send(void *opaque);
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static void tap_send(void *opaque);
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static void tap_writable(void *opaque);
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static void tap_update_fd_handler(TAPState *s)
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{
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qemu_set_fd_handler2(s->fd,
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s->read_poll ? tap_can_send : NULL,
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s->read_poll ? tap_send : NULL,
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s->write_poll ? tap_writable : NULL,
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s);
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}
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static void tap_read_poll(TAPState *s, int enable)
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{
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s->read_poll = !!enable;
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tap_update_fd_handler(s);
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}
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static void tap_write_poll(TAPState *s, int enable)
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{
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s->write_poll = !!enable;
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tap_update_fd_handler(s);
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}
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static void tap_writable(void *opaque)
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{
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TAPState *s = opaque;
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tap_write_poll(s, 0);
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qemu_flush_queued_packets(&s->nc);
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}
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static ssize_t tap_write_packet(TAPState *s, const struct iovec *iov, int iovcnt)
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{
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ssize_t len;
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do {
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len = writev(s->fd, iov, iovcnt);
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} while (len == -1 && errno == EINTR);
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if (len == -1 && errno == EAGAIN) {
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tap_write_poll(s, 1);
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return 0;
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}
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return len;
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}
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static ssize_t tap_receive_iov(VLANClientState *nc, const struct iovec *iov,
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int iovcnt)
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{
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TAPState *s = DO_UPCAST(TAPState, nc, nc);
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const struct iovec *iovp = iov;
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struct iovec iov_copy[iovcnt + 1];
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struct virtio_net_hdr hdr = { 0, };
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if (s->has_vnet_hdr && !s->using_vnet_hdr) {
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iov_copy[0].iov_base = &hdr;
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iov_copy[0].iov_len = sizeof(hdr);
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memcpy(&iov_copy[1], iov, iovcnt * sizeof(*iov));
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iovp = iov_copy;
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iovcnt++;
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}
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return tap_write_packet(s, iovp, iovcnt);
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}
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static ssize_t tap_receive_raw(VLANClientState *nc, const uint8_t *buf, size_t size)
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{
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TAPState *s = DO_UPCAST(TAPState, nc, nc);
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struct iovec iov[2];
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int iovcnt = 0;
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struct virtio_net_hdr hdr = { 0, };
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if (s->has_vnet_hdr) {
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iov[iovcnt].iov_base = &hdr;
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iov[iovcnt].iov_len = sizeof(hdr);
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iovcnt++;
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}
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iov[iovcnt].iov_base = (char *)buf;
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iov[iovcnt].iov_len = size;
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iovcnt++;
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return tap_write_packet(s, iov, iovcnt);
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}
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static ssize_t tap_receive(VLANClientState *nc, const uint8_t *buf, size_t size)
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{
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TAPState *s = DO_UPCAST(TAPState, nc, nc);
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struct iovec iov[1];
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if (s->has_vnet_hdr && !s->using_vnet_hdr) {
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return tap_receive_raw(nc, buf, size);
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}
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iov[0].iov_base = (char *)buf;
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iov[0].iov_len = size;
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return tap_write_packet(s, iov, 1);
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}
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static int tap_can_send(void *opaque)
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{
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TAPState *s = opaque;
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return qemu_can_send_packet(&s->nc);
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}
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#ifndef __sun__
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ssize_t tap_read_packet(int tapfd, uint8_t *buf, int maxlen)
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{
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return read(tapfd, buf, maxlen);
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}
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#endif
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static void tap_send_completed(VLANClientState *nc, ssize_t len)
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{
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TAPState *s = DO_UPCAST(TAPState, nc, nc);
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tap_read_poll(s, 1);
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}
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static void tap_send(void *opaque)
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{
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TAPState *s = opaque;
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int size;
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do {
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uint8_t *buf = s->buf;
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size = tap_read_packet(s->fd, s->buf, sizeof(s->buf));
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if (size <= 0) {
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break;
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}
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if (s->has_vnet_hdr && !s->using_vnet_hdr) {
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buf += sizeof(struct virtio_net_hdr);
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size -= sizeof(struct virtio_net_hdr);
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}
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size = qemu_send_packet_async(&s->nc, buf, size, tap_send_completed);
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if (size == 0) {
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tap_read_poll(s, 0);
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}
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} while (size > 0 && qemu_can_send_packet(&s->nc));
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}
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int tap_has_ufo(VLANClientState *nc)
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{
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TAPState *s = DO_UPCAST(TAPState, nc, nc);
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assert(nc->info->type == NET_CLIENT_TYPE_TAP);
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return s->has_ufo;
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}
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int tap_has_vnet_hdr(VLANClientState *nc)
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{
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TAPState *s = DO_UPCAST(TAPState, nc, nc);
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assert(nc->info->type == NET_CLIENT_TYPE_TAP);
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return s->has_vnet_hdr;
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}
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void tap_using_vnet_hdr(VLANClientState *nc, int using_vnet_hdr)
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{
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TAPState *s = DO_UPCAST(TAPState, nc, nc);
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using_vnet_hdr = using_vnet_hdr != 0;
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assert(nc->info->type == NET_CLIENT_TYPE_TAP);
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assert(s->has_vnet_hdr == using_vnet_hdr);
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s->using_vnet_hdr = using_vnet_hdr;
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}
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void tap_set_offload(VLANClientState *nc, int csum, int tso4,
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int tso6, int ecn, int ufo)
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{
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TAPState *s = DO_UPCAST(TAPState, nc, nc);
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return tap_fd_set_offload(s->fd, csum, tso4, tso6, ecn, ufo);
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}
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static void tap_cleanup(VLANClientState *nc)
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{
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TAPState *s = DO_UPCAST(TAPState, nc, nc);
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qemu_purge_queued_packets(nc);
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if (s->down_script[0])
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launch_script(s->down_script, s->down_script_arg, s->fd);
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tap_read_poll(s, 0);
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tap_write_poll(s, 0);
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close(s->fd);
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}
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static void tap_poll(VLANClientState *nc, bool enable)
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{
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TAPState *s = DO_UPCAST(TAPState, nc, nc);
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tap_read_poll(s, enable);
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tap_write_poll(s, enable);
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}
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/* fd support */
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static NetClientInfo net_tap_info = {
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.type = NET_CLIENT_TYPE_TAP,
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.size = sizeof(TAPState),
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.receive = tap_receive,
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.receive_raw = tap_receive_raw,
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.receive_iov = tap_receive_iov,
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.poll = tap_poll,
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.cleanup = tap_cleanup,
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};
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static TAPState *net_tap_fd_init(VLANState *vlan,
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const char *model,
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const char *name,
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int fd,
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int vnet_hdr)
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{
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VLANClientState *nc;
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TAPState *s;
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nc = qemu_new_net_client(&net_tap_info, vlan, NULL, model, name);
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s = DO_UPCAST(TAPState, nc, nc);
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s->fd = fd;
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s->has_vnet_hdr = vnet_hdr != 0;
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s->using_vnet_hdr = 0;
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s->has_ufo = tap_probe_has_ufo(s->fd);
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tap_set_offload(&s->nc, 0, 0, 0, 0, 0);
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tap_read_poll(s, 1);
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return s;
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}
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static int launch_script(const char *setup_script, const char *ifname, int fd)
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{
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sigset_t oldmask, mask;
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int pid, status;
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char *args[3];
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char **parg;
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sigemptyset(&mask);
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sigaddset(&mask, SIGCHLD);
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sigprocmask(SIG_BLOCK, &mask, &oldmask);
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/* try to launch network script */
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pid = fork();
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if (pid == 0) {
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int open_max = sysconf(_SC_OPEN_MAX), i;
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for (i = 0; i < open_max; i++) {
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if (i != STDIN_FILENO &&
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i != STDOUT_FILENO &&
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i != STDERR_FILENO &&
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i != fd) {
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close(i);
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}
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}
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parg = args;
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*parg++ = (char *)setup_script;
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*parg++ = (char *)ifname;
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*parg++ = NULL;
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execv(setup_script, args);
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_exit(1);
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} else if (pid > 0) {
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while (waitpid(pid, &status, 0) != pid) {
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/* loop */
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}
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sigprocmask(SIG_SETMASK, &oldmask, NULL);
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if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
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return 0;
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}
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}
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fprintf(stderr, "%s: could not launch network script\n", setup_script);
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return -1;
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}
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static int net_tap_init(QemuOpts *opts, int *vnet_hdr)
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{
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int fd, vnet_hdr_required;
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char ifname[128] = {0,};
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const char *setup_script;
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if (qemu_opt_get(opts, "ifname")) {
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pstrcpy(ifname, sizeof(ifname), qemu_opt_get(opts, "ifname"));
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}
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*vnet_hdr = qemu_opt_get_bool(opts, "vnet_hdr", 1);
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if (qemu_opt_get(opts, "vnet_hdr")) {
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vnet_hdr_required = *vnet_hdr;
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} else {
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vnet_hdr_required = 0;
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}
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TFR(fd = tap_open(ifname, sizeof(ifname), vnet_hdr, vnet_hdr_required));
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if (fd < 0) {
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return -1;
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}
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setup_script = qemu_opt_get(opts, "script");
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if (setup_script &&
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setup_script[0] != '\0' &&
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strcmp(setup_script, "no") != 0 &&
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launch_script(setup_script, ifname, fd)) {
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close(fd);
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return -1;
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}
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qemu_opt_set(opts, "ifname", ifname);
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return fd;
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}
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int net_init_tap(QemuOpts *opts, Monitor *mon, const char *name, VLANState *vlan)
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{
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TAPState *s;
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int fd, vnet_hdr = 0;
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if (qemu_opt_get(opts, "fd")) {
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if (qemu_opt_get(opts, "ifname") ||
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qemu_opt_get(opts, "script") ||
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qemu_opt_get(opts, "downscript") ||
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qemu_opt_get(opts, "vnet_hdr")) {
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qemu_error("ifname=, script=, downscript= and vnet_hdr= is invalid with fd=\n");
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return -1;
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}
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fd = net_handle_fd_param(mon, qemu_opt_get(opts, "fd"));
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if (fd == -1) {
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return -1;
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}
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fcntl(fd, F_SETFL, O_NONBLOCK);
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vnet_hdr = tap_probe_vnet_hdr(fd);
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} else {
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if (!qemu_opt_get(opts, "script")) {
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qemu_opt_set(opts, "script", DEFAULT_NETWORK_SCRIPT);
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}
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if (!qemu_opt_get(opts, "downscript")) {
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qemu_opt_set(opts, "downscript", DEFAULT_NETWORK_DOWN_SCRIPT);
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}
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fd = net_tap_init(opts, &vnet_hdr);
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if (fd == -1) {
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return -1;
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}
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}
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s = net_tap_fd_init(vlan, "tap", name, fd, vnet_hdr);
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if (!s) {
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close(fd);
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return -1;
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}
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if (tap_set_sndbuf(s->fd, opts) < 0) {
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return -1;
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}
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if (qemu_opt_get(opts, "fd")) {
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snprintf(s->nc.info_str, sizeof(s->nc.info_str), "fd=%d", fd);
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} else {
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const char *ifname, *script, *downscript;
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ifname = qemu_opt_get(opts, "ifname");
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script = qemu_opt_get(opts, "script");
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downscript = qemu_opt_get(opts, "downscript");
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snprintf(s->nc.info_str, sizeof(s->nc.info_str),
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"ifname=%s,script=%s,downscript=%s",
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ifname, script, downscript);
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if (strcmp(downscript, "no") != 0) {
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snprintf(s->down_script, sizeof(s->down_script), "%s", downscript);
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snprintf(s->down_script_arg, sizeof(s->down_script_arg), "%s", ifname);
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}
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}
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if (vlan) {
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vlan->nb_host_devs++;
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}
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return 0;
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}
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