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net: multiqueue support

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This patch adds basic multiqueue support for qemu. The idea is simple, an array
of NetClientStates were introduced in NICState, parse_netdev() were extended to
find and match all NetClientStates belongs to the backend and place their
pointers in NICConf. Then qemu_new_nic can setup a N:N mapping between NICStates
that belongs to a nic and NICStates belongs to the netdev. And a queue_index
were introduced in NetClientState to track its index. After this, each peers of
a NICState were abstracted as a queue.

After this change, all NetClientState that belongs to the same backend/nic has
the same id. When use want to change the link status, all NetClientStates that
belongs to the same backend/nic will be also changed. When user want to delete
a device or netdev, all NetClientStates that belongs to the same backend/nic
will be deleted also. Changing or deleting an specific queue is not allowed.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Jason Wang 2013-01-30 19:12:28 +08:00 committed by Anthony Liguori
parent f7860455fd
commit 1ceef9f273
6 changed files with 139 additions and 48 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
hw/dp8393x.c
View File

@ -900,7 +900,7 @@ void dp83932_init(NICInfo *nd, hwaddr base, int it_shift,
s->regs[SONIC_SR] = 0x0004; /* only revision recognized by Linux */
s->conf.macaddr = nd->macaddr;
s->conf.peer = nd->netdev;
s->conf.peers.ncs[0] = nd->netdev;
s->nic = qemu_new_nic(&net_dp83932_info, &s->conf, nd->model, nd->name, s);

2
hw/mcf_fec.c
View File

@ -472,7 +472,7 @@ void mcf_fec_init(MemoryRegion *sysmem, NICInfo *nd,
memory_region_add_subregion(sysmem, base, &s->iomem);
s->conf.macaddr = nd->macaddr;
s->conf.peer = nd->netdev;
s->conf.peers.ncs[0] = nd->netdev;
s->nic = qemu_new_nic(&net_mcf_fec_info, &s->conf, nd->model, nd->name, s);

46
hw/qdev-properties-system.c
View File

@ -173,16 +173,47 @@ PropertyInfo qdev_prop_chr = {
static int parse_netdev(DeviceState *dev, const char *str, void **ptr)
{
NetClientState *netdev = qemu_find_netdev(str);
NICPeers *peers_ptr = (NICPeers *)ptr;
NICConf *conf = container_of(peers_ptr, NICConf, peers);
NetClientState **ncs = peers_ptr->ncs;
NetClientState *peers[MAX_QUEUE_NUM];
int queues, i = 0;
int ret;
if (netdev == NULL) {
return -ENOENT;
queues = qemu_find_net_clients_except(str, peers,
NET_CLIENT_OPTIONS_KIND_NIC,
MAX_QUEUE_NUM);
if (queues == 0) {
ret = -ENOENT;
goto err;
}
if (netdev->peer) {
return -EEXIST;
if (queues > MAX_QUEUE_NUM) {
ret = -E2BIG;
goto err;
}
*ptr = netdev;
for (i = 0; i < queues; i++) {
if (peers[i] == NULL) {
ret = -ENOENT;
goto err;
}
if (peers[i]->peer) {
ret = -EEXIST;
goto err;
}
ncs[i] = peers[i];
ncs[i]->queue_index = i;
}
conf->queues = queues;
return 0;
err:
return ret;
}
static const char *print_netdev(void *ptr)
@ -249,7 +280,8 @@ static void set_vlan(Object *obj, Visitor *v, void *opaque,
{
DeviceState *dev = DEVICE(obj);
Property *prop = opaque;
NetClientState **ptr = qdev_get_prop_ptr(dev, prop);
NICPeers *peers_ptr = qdev_get_prop_ptr(dev, prop);
NetClientState **ptr = &peers_ptr->ncs[0];
Error *local_err = NULL;
int32_t id;
NetClientState *hubport;

6
hw/qdev-properties.h
View File

@ -31,7 +31,7 @@ extern PropertyInfo qdev_prop_pci_host_devaddr;
.name = (_name), \
.info = &(_prop), \
.offset = offsetof(_state, _field) \
+ type_check(_type,typeof_field(_state, _field)), \
+ type_check(_type, typeof_field(_state, _field)), \
}
#define DEFINE_PROP_DEFAULT(_name, _state, _field, _defval, _prop, _type) { \
.name = (_name), \
@ -77,9 +77,9 @@ extern PropertyInfo qdev_prop_pci_host_devaddr;
#define DEFINE_PROP_STRING(_n, _s, _f) \
DEFINE_PROP(_n, _s, _f, qdev_prop_string, char*)
#define DEFINE_PROP_NETDEV(_n, _s, _f) \
DEFINE_PROP(_n, _s, _f, qdev_prop_netdev, NetClientState*)
DEFINE_PROP(_n, _s, _f, qdev_prop_netdev, NICPeers)
#define DEFINE_PROP_VLAN(_n, _s, _f) \
DEFINE_PROP(_n, _s, _f, qdev_prop_vlan, NetClientState*)
DEFINE_PROP(_n, _s, _f, qdev_prop_vlan, NICPeers)
#define DEFINE_PROP_DRIVE(_n, _s, _f) \
DEFINE_PROP(_n, _s, _f, qdev_prop_drive, BlockDriverState *)
#define DEFINE_PROP_MACADDR(_n, _s, _f) \

18
include/net/net.h
View File

@ -9,24 +9,32 @@
#include "migration/vmstate.h"
#include "qapi-types.h"
#define MAX_QUEUE_NUM 1024
struct MACAddr {
uint8_t a[6];
};
/* qdev nic properties */
typedef struct NICPeers {
NetClientState *ncs[MAX_QUEUE_NUM];
} NICPeers;
typedef struct NICConf {
MACAddr macaddr;
NetClientState *peer;
NICPeers peers;
int32_t bootindex;
int32_t queues;
} NICConf;
#define DEFINE_NIC_PROPERTIES(_state, _conf) \
DEFINE_PROP_MACADDR("mac", _state, _conf.macaddr), \
DEFINE_PROP_VLAN("vlan", _state, _conf.peer), \
DEFINE_PROP_NETDEV("netdev", _state, _conf.peer), \
DEFINE_PROP_VLAN("vlan", _state, _conf.peers), \
DEFINE_PROP_NETDEV("netdev", _state, _conf.peers), \
DEFINE_PROP_INT32("bootindex", _state, _conf.bootindex, -1)
/* Net clients */
typedef void (NetPoll)(NetClientState *, bool enable);
@ -60,10 +68,11 @@ struct NetClientState {
char info_str[256];
unsigned receive_disabled : 1;
NetClientDestructor *destructor;
unsigned int queue_index;
};
typedef struct NICState {
NetClientState nc;
NetClientState ncs[MAX_QUEUE_NUM];
NICConf *conf;
void *opaque;
bool peer_deleted;
@ -82,6 +91,7 @@ NICState *qemu_new_nic(NetClientInfo *info,
const char *name,
void *opaque);
void qemu_del_nic(NICState *nic);
NetClientState *qemu_get_subqueue(NICState *nic, int queue_index);
NetClientState *qemu_get_queue(NICState *nic);
NICState *qemu_get_nic(NetClientState *nc);
void *qemu_get_nic_opaque(NetClientState *nc);

113
net/net.c
View File

@ -236,28 +236,44 @@ NICState *qemu_new_nic(NetClientInfo *info,
void *opaque)
{
NetClientState *nc;
NetClientState **peers = conf->peers.ncs;
NICState *nic;
int i;
assert(info->type == NET_CLIENT_OPTIONS_KIND_NIC);
assert(info->size >= sizeof(NICState));
nc = qemu_new_net_client(info, conf->peer, model, name);
nc = qemu_new_net_client(info, peers[0], model, name);
nc->queue_index = 0;
nic = qemu_get_nic(nc);
nic->conf = conf;
nic->opaque = opaque;
for (i = 1; i < conf->queues; i++) {
qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, nc->name,
NULL);
nic->ncs[i].queue_index = i;
}
return nic;
}
NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
{
return &nic->ncs[queue_index];
}
NetClientState *qemu_get_queue(NICState *nic)
{
return &nic->nc;
return qemu_get_subqueue(nic, 0);
}
NICState *qemu_get_nic(NetClientState *nc)
{
return DO_UPCAST(NICState, nc, nc);
NetClientState *nc0 = nc - nc->queue_index;
return DO_UPCAST(NICState, ncs[0], nc0);
}
void *qemu_get_nic_opaque(NetClientState *nc)
@ -271,9 +287,7 @@ static void qemu_cleanup_net_client(NetClientState *nc)
{
QTAILQ_REMOVE(&net_clients, nc, next);
if (nc->info->cleanup) {
nc->info->cleanup(nc);
}
nc->info->cleanup(nc);
}
static void qemu_free_net_client(NetClientState *nc)
@ -293,6 +307,17 @@ static void qemu_free_net_client(NetClientState *nc)
void qemu_del_net_client(NetClientState *nc)
{
NetClientState *ncs[MAX_QUEUE_NUM];
int queues, i;
/* If the NetClientState belongs to a multiqueue backend, we will change all
* other NetClientStates also.
*/
queues = qemu_find_net_clients_except(nc->name, ncs,
NET_CLIENT_OPTIONS_KIND_NIC,
MAX_QUEUE_NUM);
assert(queues != 0);
/* If there is a peer NIC, delete and cleanup client, but do not free. */
if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
NICState *nic = qemu_get_nic(nc->peer);
@ -300,34 +325,47 @@ void qemu_del_net_client(NetClientState *nc)
return;
}
nic->peer_deleted = true;
/* Let NIC know peer is gone. */
nc->peer->link_down = true;
for (i = 0; i < queues; i++) {
ncs[i]->peer->link_down = true;
}
if (nc->peer->info->link_status_changed) {
nc->peer->info->link_status_changed(nc->peer);
}
qemu_cleanup_net_client(nc);
for (i = 0; i < queues; i++) {
qemu_cleanup_net_client(ncs[i]);
}
return;
}
assert(nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC);
qemu_cleanup_net_client(nc);
qemu_free_net_client(nc);
for (i = 0; i < queues; i++) {
qemu_cleanup_net_client(ncs[i]);
qemu_free_net_client(ncs[i]);
}
}
void qemu_del_nic(NICState *nic)
{
NetClientState *nc = qemu_get_queue(nic);
int i, queues = nic->conf->queues;
/* If this is a peer NIC and peer has already been deleted, free it now. */
if (nc->peer && nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
NICState *nic = qemu_get_nic(nc);
if (nic->peer_deleted) {
qemu_free_net_client(nc->peer);
if (nic->peer_deleted) {
for (i = 0; i < queues; i++) {
qemu_free_net_client(qemu_get_subqueue(nic, i)->peer);
}
}
qemu_cleanup_net_client(nc);
qemu_free_net_client(nc);
for (i = queues - 1; i >= 0; i--) {
NetClientState *nc = qemu_get_subqueue(nic, i);
qemu_cleanup_net_client(nc);
qemu_free_net_client(nc);
}
}
void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
@ -336,7 +374,9 @@ void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
QTAILQ_FOREACH(nc, &net_clients, next) {
if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
func(qemu_get_nic(nc), opaque);
if (nc->queue_index == 0) {
func(qemu_get_nic(nc), opaque);
}
}
}
}
@ -911,8 +951,10 @@ void qmp_netdev_del(const char *id, Error **errp)
void print_net_client(Monitor *mon, NetClientState *nc)
{
monitor_printf(mon, "%s: type=%s,%s\n", nc->name,
NetClientOptionsKind_lookup[nc->info->type], nc->info_str);
monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
nc->queue_index,
NetClientOptionsKind_lookup[nc->info->type],
nc->info_str);
}
void do_info_network(Monitor *mon, const QDict *qdict)
@ -943,20 +985,23 @@ void do_info_network(Monitor *mon, const QDict *qdict)
void qmp_set_link(const char *name, bool up, Error **errp)
{
NetClientState *nc = NULL;
NetClientState *ncs[MAX_QUEUE_NUM];
NetClientState *nc;
int queues, i;
QTAILQ_FOREACH(nc, &net_clients, next) {
if (!strcmp(nc->name, name)) {
goto done;
}
}
done:
if (!nc) {
queues = qemu_find_net_clients_except(name, ncs,
NET_CLIENT_OPTIONS_KIND_MAX,
MAX_QUEUE_NUM);
if (queues == 0) {
error_set(errp, QERR_DEVICE_NOT_FOUND, name);
return;
}
nc = ncs[0];
nc->link_down = !up;
for (i = 0; i < queues; i++) {
ncs[i]->link_down = !up;
}
if (nc->info->link_status_changed) {
nc->info->link_status_changed(nc);
@ -976,9 +1021,13 @@ done:
void net_cleanup(void)
{
NetClientState *nc, *next_vc;
NetClientState *nc;
QTAILQ_FOREACH_SAFE(nc, &net_clients, next, next_vc) {
/* We may del multiple entries during qemu_del_net_client(),
* so QTAILQ_FOREACH_SAFE() is also not safe here.
*/
while (!QTAILQ_EMPTY(&net_clients)) {
nc = QTAILQ_FIRST(&net_clients);
if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
qemu_del_nic(qemu_get_nic(nc));
} else {