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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
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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);