d32fcad366
Socket buffer sizes were hard-coded to 4K for VDE and socket netdevs. Bump this
up to 68K (ala tap netdev) to handle maximum GSO packet size (64k) plus plenty
of room for the ethernet and virtio_net headers.
Originally, ran into this limitation when using -netdev UDP sockets to connect
VM-to-VM, where VM interface is configure with MTU=9000. (Using virtio_net
NIC model). Test is simple: ping -M do -s 8500 <target>. This test will
attempt to ping with unfragmented packet of given size. Without patch, size
is limited to < 4K (minus protocol hdrs). With patch, ping test works with pkt
size up to 9000 (again, minus protocol hdrs).
v2: per Stefan, increase buf size to (4096+65536) as done in tap and apply
to vde and socket netdevs.
v1: increase buf size to 12K just for -netdev UDP sockets
Signed-off-by: Scott Feldman <sfeldma@cumulusnetworks.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
128 lines
3.5 KiB
C
128 lines
3.5 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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*
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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 "config-host.h"
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#include <libvdeplug.h>
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#include "net/net.h"
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#include "clients.h"
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#include "qemu-common.h"
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#include "qemu/option.h"
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#include "qemu/main-loop.h"
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typedef struct VDEState {
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NetClientState nc;
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VDECONN *vde;
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} VDEState;
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static void vde_to_qemu(void *opaque)
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{
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VDEState *s = opaque;
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uint8_t buf[NET_BUFSIZE];
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int size;
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size = vde_recv(s->vde, (char *)buf, sizeof(buf), 0);
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if (size > 0) {
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qemu_send_packet(&s->nc, buf, size);
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}
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}
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static ssize_t vde_receive(NetClientState *nc, const uint8_t *buf, size_t size)
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{
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VDEState *s = DO_UPCAST(VDEState, nc, nc);
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ssize_t ret;
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do {
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ret = vde_send(s->vde, (const char *)buf, size, 0);
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} while (ret < 0 && errno == EINTR);
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return ret;
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}
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static void vde_cleanup(NetClientState *nc)
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{
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VDEState *s = DO_UPCAST(VDEState, nc, nc);
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qemu_set_fd_handler(vde_datafd(s->vde), NULL, NULL, NULL);
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vde_close(s->vde);
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}
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static NetClientInfo net_vde_info = {
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.type = NET_CLIENT_OPTIONS_KIND_VDE,
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.size = sizeof(VDEState),
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.receive = vde_receive,
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.cleanup = vde_cleanup,
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};
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static int net_vde_init(NetClientState *peer, const char *model,
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const char *name, const char *sock,
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int port, const char *group, int mode)
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{
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NetClientState *nc;
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VDEState *s;
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VDECONN *vde;
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char *init_group = (char *)group;
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char *init_sock = (char *)sock;
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struct vde_open_args args = {
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.port = port,
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.group = init_group,
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.mode = mode,
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};
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vde = vde_open(init_sock, (char *)"QEMU", &args);
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if (!vde){
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return -1;
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}
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nc = qemu_new_net_client(&net_vde_info, peer, model, name);
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snprintf(nc->info_str, sizeof(nc->info_str), "sock=%s,fd=%d",
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sock, vde_datafd(vde));
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s = DO_UPCAST(VDEState, nc, nc);
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s->vde = vde;
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qemu_set_fd_handler(vde_datafd(s->vde), vde_to_qemu, NULL, s);
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return 0;
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}
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int net_init_vde(const NetClientOptions *opts, const char *name,
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NetClientState *peer)
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{
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const NetdevVdeOptions *vde;
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assert(opts->kind == NET_CLIENT_OPTIONS_KIND_VDE);
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vde = opts->vde;
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/* missing optional values have been initialized to "all bits zero" */
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if (net_vde_init(peer, "vde", name, vde->sock, vde->port, vde->group,
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vde->has_mode ? vde->mode : 0700) == -1) {
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return -1;
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}
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return 0;
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}
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