diff options
| -rw-r--r-- | net.c | 8 | ||||
| -rw-r--r-- | net/tap.c | 29 | ||||
| -rw-r--r-- | qemu-options.hx | 4 |
3 files changed, 40 insertions, 1 deletions
@@ -976,6 +976,14 @@ static const struct { .name = "vnet_hdr", .type = QEMU_OPT_BOOL, .help = "enable the IFF_VNET_HDR flag on the tap interface" + }, { + .name = "vhost", + .type = QEMU_OPT_BOOL, + .help = "enable vhost-net network accelerator", + }, { + .name = "vhostfd", + .type = QEMU_OPT_STRING, + .help = "file descriptor of an already opened vhost net device", }, #endif /* _WIN32 */ { /* end of list */ } @@ -42,6 +42,8 @@ #include "net/tap-linux.h" +#include "hw/vhost_net.h" + /* Maximum GSO packet size (64k) plus plenty of room for * the ethernet and virtio_net headers */ @@ -58,6 +60,7 @@ typedef struct TAPState { unsigned int has_vnet_hdr : 1; unsigned int using_vnet_hdr : 1; unsigned int has_ufo: 1; + VHostNetState *vhost_net; } TAPState; static int launch_script(const char *setup_script, const char *ifname, int fd); @@ -253,6 +256,10 @@ static void tap_cleanup(VLANClientState *nc) { TAPState *s = DO_UPCAST(TAPState, nc, nc); + if (s->vhost_net) { + vhost_net_cleanup(s->vhost_net); + } + qemu_purge_queued_packets(nc); if (s->down_script[0]) @@ -308,6 +315,7 @@ static TAPState *net_tap_fd_init(VLANState *vlan, s->has_ufo = tap_probe_has_ufo(s->fd); tap_set_offload(&s->nc, 0, 0, 0, 0, 0); tap_read_poll(s, 1); + s->vhost_net = NULL; return s; } @@ -457,5 +465,26 @@ int net_init_tap(QemuOpts *opts, Monitor *mon, const char *name, VLANState *vlan } } + if (qemu_opt_get_bool(opts, "vhost", !!qemu_opt_get(opts, "vhostfd"))) { + int vhostfd, r; + if (qemu_opt_get(opts, "vhostfd")) { + r = net_handle_fd_param(mon, qemu_opt_get(opts, "vhostfd")); + if (r == -1) { + return -1; + } + vhostfd = r; + } else { + vhostfd = -1; + } + s->vhost_net = vhost_net_init(&s->nc, vhostfd); + if (!s->vhost_net) { + error_report("vhost-net requested but could not be initialized"); + return -1; + } + } else if (qemu_opt_get(opts, "vhostfd")) { + error_report("vhostfd= is not valid without vhost"); + return -1; + } + return 0; } diff --git a/qemu-options.hx b/qemu-options.hx index 719cbda83c..f4b3bfe90f 100644 --- a/qemu-options.hx +++ b/qemu-options.hx @@ -892,7 +892,7 @@ DEF("net", HAS_ARG, QEMU_OPTION_net, "-net tap[,vlan=n][,name=str],ifname=name\n" " connect the host TAP network interface to VLAN 'n'\n" #else - "-net tap[,vlan=n][,name=str][,fd=h][,ifname=name][,script=file][,downscript=dfile][,sndbuf=nbytes][,vnet_hdr=on|off]\n" + "-net tap[,vlan=n][,name=str][,fd=h][,ifname=name][,script=file][,downscript=dfile][,sndbuf=nbytes][,vnet_hdr=on|off][,vhost=on|off][,vhostfd=h]\n" " connect the host TAP network interface to VLAN 'n' and use the\n" " network scripts 'file' (default=" DEFAULT_NETWORK_SCRIPT ")\n" " and 'dfile' (default=" DEFAULT_NETWORK_DOWN_SCRIPT ")\n" @@ -902,6 +902,8 @@ DEF("net", HAS_ARG, QEMU_OPTION_net, " default of 'sndbuf=1048576' can be disabled using 'sndbuf=0')\n" " use vnet_hdr=off to avoid enabling the IFF_VNET_HDR tap flag\n" " use vnet_hdr=on to make the lack of IFF_VNET_HDR support an error condition\n" + " use vhost=on to enable experimental in kernel accelerator\n" + " use 'vhostfd=h' to connect to an already opened vhost net device\n" #endif "-net socket[,vlan=n][,name=str][,fd=h][,listen=[host]:port][,connect=host:port]\n" " connect the vlan 'n' to another VLAN using a socket connection\n" |