a463215b08
The initial vhost-user connection sets the features to be negotiated with the driver. Renegotiation isn't possible without device reset. To handle reconnection of vhost-user backend, ensure the same set of features are provided, and reuse already acked features. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Tested-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Reviewed-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Reviewed-by: Victor Kaplansky <victork@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
362 lines
9.5 KiB
C
362 lines
9.5 KiB
C
/*
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* vhost-user.c
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*
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* Copyright (c) 2013 Virtual Open Systems Sarl.
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#include "qemu/osdep.h"
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#include "clients.h"
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#include "net/vhost_net.h"
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#include "net/vhost-user.h"
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#include "sysemu/char.h"
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#include "qemu/config-file.h"
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#include "qemu/error-report.h"
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#include "qmp-commands.h"
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#include "trace.h"
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typedef struct VhostUserState {
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NetClientState nc;
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CharDriverState *chr;
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VHostNetState *vhost_net;
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int watch;
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uint64_t acked_features;
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} VhostUserState;
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typedef struct VhostUserChardevProps {
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bool is_socket;
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bool is_unix;
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} VhostUserChardevProps;
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VHostNetState *vhost_user_get_vhost_net(NetClientState *nc)
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{
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VhostUserState *s = DO_UPCAST(VhostUserState, nc, nc);
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assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER);
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return s->vhost_net;
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}
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uint64_t vhost_user_get_acked_features(NetClientState *nc)
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{
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VhostUserState *s = DO_UPCAST(VhostUserState, nc, nc);
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assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER);
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return s->acked_features;
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}
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static int vhost_user_running(VhostUserState *s)
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{
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return (s->vhost_net) ? 1 : 0;
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}
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static void vhost_user_stop(int queues, NetClientState *ncs[])
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{
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VhostUserState *s;
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int i;
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for (i = 0; i < queues; i++) {
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assert (ncs[i]->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER);
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s = DO_UPCAST(VhostUserState, nc, ncs[i]);
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if (!vhost_user_running(s)) {
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continue;
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}
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if (s->vhost_net) {
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/* save acked features */
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s->acked_features = vhost_net_get_acked_features(s->vhost_net);
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vhost_net_cleanup(s->vhost_net);
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s->vhost_net = NULL;
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}
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}
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}
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static int vhost_user_start(int queues, NetClientState *ncs[])
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{
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VhostNetOptions options;
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VhostUserState *s;
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int max_queues;
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int i;
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options.backend_type = VHOST_BACKEND_TYPE_USER;
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for (i = 0; i < queues; i++) {
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assert (ncs[i]->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER);
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s = DO_UPCAST(VhostUserState, nc, ncs[i]);
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if (vhost_user_running(s)) {
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continue;
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}
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options.net_backend = ncs[i];
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options.opaque = s->chr;
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s->vhost_net = vhost_net_init(&options);
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if (!s->vhost_net) {
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error_report("failed to init vhost_net for queue %d", i);
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goto err;
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}
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if (i == 0) {
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max_queues = vhost_net_get_max_queues(s->vhost_net);
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if (queues > max_queues) {
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error_report("you are asking more queues than supported: %d",
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max_queues);
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goto err;
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}
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}
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}
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return 0;
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err:
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vhost_user_stop(i + 1, ncs);
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return -1;
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}
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static ssize_t vhost_user_receive(NetClientState *nc, const uint8_t *buf,
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size_t size)
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{
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/* In case of RARP (message size is 60) notify backup to send a fake RARP.
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This fake RARP will be sent by backend only for guest
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without GUEST_ANNOUNCE capability.
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*/
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if (size == 60) {
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VhostUserState *s = DO_UPCAST(VhostUserState, nc, nc);
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int r;
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static int display_rarp_failure = 1;
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char mac_addr[6];
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/* extract guest mac address from the RARP message */
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memcpy(mac_addr, &buf[6], 6);
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r = vhost_net_notify_migration_done(s->vhost_net, mac_addr);
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if ((r != 0) && (display_rarp_failure)) {
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fprintf(stderr,
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"Vhost user backend fails to broadcast fake RARP\n");
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fflush(stderr);
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display_rarp_failure = 0;
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}
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}
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return size;
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}
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static void vhost_user_cleanup(NetClientState *nc)
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{
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VhostUserState *s = DO_UPCAST(VhostUserState, nc, nc);
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if (s->vhost_net) {
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vhost_net_cleanup(s->vhost_net);
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s->vhost_net = NULL;
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}
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qemu_purge_queued_packets(nc);
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}
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static bool vhost_user_has_vnet_hdr(NetClientState *nc)
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{
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assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER);
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return true;
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}
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static bool vhost_user_has_ufo(NetClientState *nc)
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{
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assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER);
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return true;
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}
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static NetClientInfo net_vhost_user_info = {
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.type = NET_CLIENT_OPTIONS_KIND_VHOST_USER,
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.size = sizeof(VhostUserState),
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.receive = vhost_user_receive,
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.cleanup = vhost_user_cleanup,
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.has_vnet_hdr = vhost_user_has_vnet_hdr,
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.has_ufo = vhost_user_has_ufo,
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};
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static gboolean net_vhost_user_watch(GIOChannel *chan, GIOCondition cond,
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void *opaque)
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{
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VhostUserState *s = opaque;
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uint8_t buf[1];
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/* We don't actually want to read anything, but CHR_EVENT_CLOSED will be
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* raised as a side-effect of the read.
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*/
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qemu_chr_fe_read_all(s->chr, buf, sizeof(buf));
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return FALSE;
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}
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static void net_vhost_user_event(void *opaque, int event)
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{
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const char *name = opaque;
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NetClientState *ncs[MAX_QUEUE_NUM];
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VhostUserState *s;
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Error *err = NULL;
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int queues;
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queues = qemu_find_net_clients_except(name, ncs,
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NET_CLIENT_OPTIONS_KIND_NIC,
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MAX_QUEUE_NUM);
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assert(queues < MAX_QUEUE_NUM);
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s = DO_UPCAST(VhostUserState, nc, ncs[0]);
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trace_vhost_user_event(s->chr->label, event);
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switch (event) {
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case CHR_EVENT_OPENED:
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s->watch = qemu_chr_fe_add_watch(s->chr, G_IO_HUP,
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net_vhost_user_watch, s);
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if (vhost_user_start(queues, ncs) < 0) {
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qemu_chr_disconnect(s->chr);
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return;
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}
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qmp_set_link(name, true, &err);
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break;
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case CHR_EVENT_CLOSED:
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qmp_set_link(name, false, &err);
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vhost_user_stop(queues, ncs);
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g_source_remove(s->watch);
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s->watch = 0;
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break;
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}
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if (err) {
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error_report_err(err);
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}
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}
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static int net_vhost_user_init(NetClientState *peer, const char *device,
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const char *name, CharDriverState *chr,
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int queues)
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{
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NetClientState *nc;
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VhostUserState *s;
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int i;
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assert(name);
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assert(queues > 0);
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for (i = 0; i < queues; i++) {
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nc = qemu_new_net_client(&net_vhost_user_info, peer, device, name);
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snprintf(nc->info_str, sizeof(nc->info_str), "vhost-user%d to %s",
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i, chr->label);
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nc->queue_index = i;
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s = DO_UPCAST(VhostUserState, nc, nc);
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s->chr = chr;
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}
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qemu_chr_add_handlers(chr, NULL, NULL, net_vhost_user_event, nc[0].name);
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return 0;
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}
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static int net_vhost_chardev_opts(void *opaque,
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const char *name, const char *value,
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Error **errp)
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{
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VhostUserChardevProps *props = opaque;
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if (strcmp(name, "backend") == 0 && strcmp(value, "socket") == 0) {
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props->is_socket = true;
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} else if (strcmp(name, "path") == 0) {
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props->is_unix = true;
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} else if (strcmp(name, "server") == 0) {
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} else {
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error_setg(errp,
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"vhost-user does not support a chardev with option %s=%s",
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name, value);
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return -1;
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}
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return 0;
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}
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static CharDriverState *net_vhost_parse_chardev(
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const NetdevVhostUserOptions *opts, Error **errp)
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{
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CharDriverState *chr = qemu_chr_find(opts->chardev);
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VhostUserChardevProps props;
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if (chr == NULL) {
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error_setg(errp, "chardev \"%s\" not found", opts->chardev);
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return NULL;
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}
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/* inspect chardev opts */
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memset(&props, 0, sizeof(props));
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if (qemu_opt_foreach(chr->opts, net_vhost_chardev_opts, &props, errp)) {
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return NULL;
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}
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if (!props.is_socket || !props.is_unix) {
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error_setg(errp, "chardev \"%s\" is not a unix socket",
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opts->chardev);
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return NULL;
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}
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qemu_chr_fe_claim_no_fail(chr);
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return chr;
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}
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static int net_vhost_check_net(void *opaque, QemuOpts *opts, Error **errp)
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{
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const char *name = opaque;
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const char *driver, *netdev;
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const char virtio_name[] = "virtio-net-";
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driver = qemu_opt_get(opts, "driver");
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netdev = qemu_opt_get(opts, "netdev");
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if (!driver || !netdev) {
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return 0;
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}
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if (strcmp(netdev, name) == 0 &&
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strncmp(driver, virtio_name, strlen(virtio_name)) != 0) {
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error_setg(errp, "vhost-user requires frontend driver virtio-net-*");
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return -1;
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}
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return 0;
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}
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int net_init_vhost_user(const NetClientOptions *opts, const char *name,
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NetClientState *peer, Error **errp)
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{
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int queues;
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const NetdevVhostUserOptions *vhost_user_opts;
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CharDriverState *chr;
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assert(opts->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER);
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vhost_user_opts = opts->u.vhost_user.data;
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chr = net_vhost_parse_chardev(vhost_user_opts, errp);
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if (!chr) {
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return -1;
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}
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/* verify net frontend */
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if (qemu_opts_foreach(qemu_find_opts("device"), net_vhost_check_net,
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(char *)name, errp)) {
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return -1;
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}
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queues = vhost_user_opts->has_queues ? vhost_user_opts->queues : 1;
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if (queues < 1 || queues > MAX_QUEUE_NUM) {
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error_setg(errp,
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"vhost-user number of queues must be in range [1, %d]",
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MAX_QUEUE_NUM);
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return -1;
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}
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return net_vhost_user_init(peer, "vhost_user", name, chr, queues);
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}
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