2 * Virtio Network Device
4 * Copyright IBM, Corp. 2007
7 * Anthony Liguori <aliguori@us.ibm.com>
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
14 #ifndef QEMU_VIRTIO_NET_H
15 #define QEMU_VIRTIO_NET_H
17 #include "qemu/units.h"
18 #include "standard-headers/linux/virtio_net.h"
19 #include "hw/virtio/virtio.h"
20 #include "net/announce.h"
22 #define TYPE_VIRTIO_NET "virtio-net-device"
23 #define VIRTIO_NET(obj) \
24 OBJECT_CHECK(VirtIONet, (obj), TYPE_VIRTIO_NET)
26 #define TX_TIMER_INTERVAL 150000 /* 150 us */
28 /* Limit the number of packets that can be sent via a single flush
29 * of the TX queue. This gives us a guaranteed exit condition and
30 * ensures fairness in the io path. 256 conveniently matches the
31 * length of the TX queue and shows a good balance of performance
35 typedef struct virtio_net_conf
40 uint16_t rx_queue_size
;
41 uint16_t tx_queue_size
;
48 /* Coalesced packets type & status */
50 RSC_COALESCE
, /* Data been coalesced */
51 RSC_FINAL
, /* Will terminate current connection */
52 RSC_NO_MATCH
, /* No matched in the buffer pool */
53 RSC_BYPASS
, /* Packet to be bypass, not tcp, tcp ctrl, etc */
54 RSC_CANDIDATE
/* Data want to be coalesced */
57 typedef struct VirtioNetRscStat
{
63 uint32_t no_match_cache
;
67 uint32_t tcp_ctrl_drain
;
72 uint32_t ack_out_of_win
;
73 uint32_t data_out_of_win
;
74 uint32_t data_out_of_order
;
75 uint32_t data_after_pure_ack
;
76 uint32_t bypass_not_tcp
;
83 uint32_t purge_failed
;
84 uint32_t drain_failed
;
85 uint32_t final_failed
;
89 /* Rsc unit general info used to checking if can coalescing */
90 typedef struct VirtioNetRscUnit
{
91 void *ip
; /* ip header */
92 uint16_t *ip_plen
; /* data len pointer in ip header field */
93 struct tcp_header
*tcp
; /* tcp header */
94 uint16_t tcp_hdrlen
; /* tcp header len */
95 uint16_t payload
; /* pure payload without virtio/eth/ip/tcp */
98 /* Coalesced segment */
99 typedef struct VirtioNetRscSeg
{
100 QTAILQ_ENTRY(VirtioNetRscSeg
) next
;
105 bool is_coalesced
; /* need recal ipv4 header checksum, mark here */
106 VirtioNetRscUnit unit
;
110 typedef struct VirtIONet VirtIONet
;
112 /* Chain is divided by protocol(ipv4/v6) and NetClientInfo */
113 typedef struct VirtioNetRscChain
{
114 QTAILQ_ENTRY(VirtioNetRscChain
) next
;
115 VirtIONet
*n
; /* VirtIONet */
118 uint16_t max_payload
;
119 QEMUTimer
*drain_timer
;
120 QTAILQ_HEAD(, VirtioNetRscSeg
) buffers
;
121 VirtioNetRscStat stat
;
124 /* Maximum packet size we can receive from tap device: header + 64k */
125 #define VIRTIO_NET_MAX_BUFSIZE (sizeof(struct virtio_net_hdr) + (64 * KiB))
127 typedef struct VirtIONetQueue
{
134 VirtQueueElement
*elem
;
140 VirtIODevice parent_obj
;
141 uint8_t mac
[ETH_ALEN
];
146 /* RSC Chains - temporary storage of coalesced data,
147 all these data are lost in case of migration */
148 QTAILQ_HEAD(, VirtioNetRscChain
) rsc_chains
;
151 uint32_t has_vnet_hdr
;
153 size_t guest_hdr_len
;
154 uint64_t host_features
;
155 uint32_t rsc_timeout
;
156 uint8_t rsc4_enabled
;
157 uint8_t rsc6_enabled
;
159 uint32_t mergeable_rx_bufs
;
166 uint8_t vhost_started
;
169 uint32_t first_multi
;
170 uint8_t multi_overflow
;
171 uint8_t uni_overflow
;
175 virtio_net_conf net_conf
;
180 uint16_t curr_queues
;
182 char *netclient_name
;
183 char *netclient_type
;
184 uint64_t curr_guest_offloads
;
185 AnnounceTimer announce_timer
;
186 bool needs_vnet_hdr_swap
;
187 bool mtu_bypass_backend
;
190 void virtio_net_set_netclient_name(VirtIONet
*n
, const char *name
,