xref: /openbmc/qemu/include/hw/virtio/virtio-net.h (revision 53c7c924)
1 /*
2  * Virtio Network Device
3  *
4  * Copyright IBM, Corp. 2007
5  *
6  * Authors:
7  *  Anthony Liguori   <aliguori@us.ibm.com>
8  *
9  * This work is licensed under the terms of the GNU GPL, version 2.  See
10  * the COPYING file in the top-level directory.
11  *
12  */
13 
14 #ifndef QEMU_VIRTIO_NET_H
15 #define QEMU_VIRTIO_NET_H
16 
17 #include "qemu/units.h"
18 #include "standard-headers/linux/virtio_net.h"
19 #include "hw/virtio/virtio.h"
20 #include "net/announce.h"
21 #include "qemu/option_int.h"
22 #include "qom/object.h"
23 
24 #include "ebpf/ebpf_rss.h"
25 
26 #define TYPE_VIRTIO_NET "virtio-net-device"
27 OBJECT_DECLARE_SIMPLE_TYPE(VirtIONet, VIRTIO_NET)
28 
29 #define TX_TIMER_INTERVAL 150000 /* 150 us */
30 
31 /* Limit the number of packets that can be sent via a single flush
32  * of the TX queue.  This gives us a guaranteed exit condition and
33  * ensures fairness in the io path.  256 conveniently matches the
34  * length of the TX queue and shows a good balance of performance
35  * and latency. */
36 #define TX_BURST 256
37 
38 /* Maximum VIRTIO_NET_CTRL_MAC_TABLE_SET unicast + multicast entries. */
39 #define MAC_TABLE_ENTRIES    64
40 
41 typedef struct virtio_net_conf
42 {
43     uint32_t txtimer;
44     int32_t txburst;
45     char *tx;
46     uint16_t rx_queue_size;
47     uint16_t tx_queue_size;
48     uint16_t mtu;
49     int32_t speed;
50     char *duplex_str;
51     uint8_t duplex;
52     char *primary_id_str;
53 } virtio_net_conf;
54 
55 /* Coalesced packets type & status */
56 typedef enum {
57     RSC_COALESCE,           /* Data been coalesced */
58     RSC_FINAL,              /* Will terminate current connection */
59     RSC_NO_MATCH,           /* No matched in the buffer pool */
60     RSC_BYPASS,             /* Packet to be bypass, not tcp, tcp ctrl, etc */
61     RSC_CANDIDATE                /* Data want to be coalesced */
62 } CoalesceStatus;
63 
64 typedef struct VirtioNetRscStat {
65     uint32_t received;
66     uint32_t coalesced;
67     uint32_t over_size;
68     uint32_t cache;
69     uint32_t empty_cache;
70     uint32_t no_match_cache;
71     uint32_t win_update;
72     uint32_t no_match;
73     uint32_t tcp_syn;
74     uint32_t tcp_ctrl_drain;
75     uint32_t dup_ack;
76     uint32_t dup_ack1;
77     uint32_t dup_ack2;
78     uint32_t pure_ack;
79     uint32_t ack_out_of_win;
80     uint32_t data_out_of_win;
81     uint32_t data_out_of_order;
82     uint32_t data_after_pure_ack;
83     uint32_t bypass_not_tcp;
84     uint32_t tcp_option;
85     uint32_t tcp_all_opt;
86     uint32_t ip_frag;
87     uint32_t ip_ecn;
88     uint32_t ip_hacked;
89     uint32_t ip_option;
90     uint32_t purge_failed;
91     uint32_t drain_failed;
92     uint32_t final_failed;
93     int64_t  timer;
94 } VirtioNetRscStat;
95 
96 /* Rsc unit general info used to checking if can coalescing */
97 typedef struct VirtioNetRscUnit {
98     void *ip;   /* ip header */
99     uint16_t *ip_plen;      /* data len pointer in ip header field */
100     struct tcp_header *tcp; /* tcp header */
101     uint16_t tcp_hdrlen;    /* tcp header len */
102     uint16_t payload;       /* pure payload without virtio/eth/ip/tcp */
103 } VirtioNetRscUnit;
104 
105 /* Coalesced segment */
106 typedef struct VirtioNetRscSeg {
107     QTAILQ_ENTRY(VirtioNetRscSeg) next;
108     void *buf;
109     size_t size;
110     uint16_t packets;
111     uint16_t dup_ack;
112     bool is_coalesced;      /* need recal ipv4 header checksum, mark here */
113     VirtioNetRscUnit unit;
114     NetClientState *nc;
115 } VirtioNetRscSeg;
116 
117 
118 /* Chain is divided by protocol(ipv4/v6) and NetClientInfo */
119 typedef struct VirtioNetRscChain {
120     QTAILQ_ENTRY(VirtioNetRscChain) next;
121     VirtIONet *n;                            /* VirtIONet */
122     uint16_t proto;
123     uint8_t  gso_type;
124     uint16_t max_payload;
125     QEMUTimer *drain_timer;
126     QTAILQ_HEAD(, VirtioNetRscSeg) buffers;
127     VirtioNetRscStat stat;
128 } VirtioNetRscChain;
129 
130 /* Maximum packet size we can receive from tap device: header + 64k */
131 #define VIRTIO_NET_MAX_BUFSIZE (sizeof(struct virtio_net_hdr) + (64 * KiB))
132 
133 #define VIRTIO_NET_RSS_MAX_KEY_SIZE     40
134 #define VIRTIO_NET_RSS_MAX_TABLE_LEN    128
135 
136 typedef struct VirtioNetRssData {
137     bool    enabled;
138     bool    enabled_software_rss;
139     bool    redirect;
140     bool    populate_hash;
141     uint32_t hash_types;
142     uint8_t key[VIRTIO_NET_RSS_MAX_KEY_SIZE];
143     uint16_t indirections_len;
144     uint16_t *indirections_table;
145     uint16_t default_queue;
146 } VirtioNetRssData;
147 
148 typedef struct VirtIONetQueue {
149     VirtQueue *rx_vq;
150     VirtQueue *tx_vq;
151     QEMUTimer *tx_timer;
152     QEMUBH *tx_bh;
153     uint32_t tx_waiting;
154     struct {
155         VirtQueueElement *elem;
156     } async_tx;
157     struct VirtIONet *n;
158 } VirtIONetQueue;
159 
160 struct VirtIONet {
161     VirtIODevice parent_obj;
162     uint8_t mac[ETH_ALEN];
163     uint16_t status;
164     VirtIONetQueue *vqs;
165     VirtQueue *ctrl_vq;
166     NICState *nic;
167     /* RSC Chains - temporary storage of coalesced data,
168        all these data are lost in case of migration */
169     QTAILQ_HEAD(, VirtioNetRscChain) rsc_chains;
170     uint32_t tx_timeout;
171     int32_t tx_burst;
172     uint32_t has_vnet_hdr;
173     size_t host_hdr_len;
174     size_t guest_hdr_len;
175     uint64_t host_features;
176     uint32_t rsc_timeout;
177     uint8_t rsc4_enabled;
178     uint8_t rsc6_enabled;
179     uint8_t has_ufo;
180     uint32_t mergeable_rx_bufs;
181     uint8_t promisc;
182     uint8_t allmulti;
183     uint8_t alluni;
184     uint8_t nomulti;
185     uint8_t nouni;
186     uint8_t nobcast;
187     uint8_t vhost_started;
188     struct {
189         uint32_t in_use;
190         uint32_t first_multi;
191         uint8_t multi_overflow;
192         uint8_t uni_overflow;
193         uint8_t *macs;
194     } mac_table;
195     uint32_t *vlans;
196     virtio_net_conf net_conf;
197     NICConf nic_conf;
198     DeviceState *qdev;
199     int multiqueue;
200     uint16_t max_queue_pairs;
201     uint16_t curr_queue_pairs;
202     uint16_t max_ncs;
203     size_t config_size;
204     char *netclient_name;
205     char *netclient_type;
206     uint64_t curr_guest_offloads;
207     /* used on saved state restore phase to preserve the curr_guest_offloads */
208     uint64_t saved_guest_offloads;
209     AnnounceTimer announce_timer;
210     bool needs_vnet_hdr_swap;
211     bool mtu_bypass_backend;
212     /* primary failover device is hidden*/
213     bool failover_primary_hidden;
214     bool failover;
215     DeviceListener primary_listener;
216     QDict *primary_opts;
217     bool primary_opts_from_json;
218     Notifier migration_state;
219     VirtioNetRssData rss_data;
220     struct NetRxPkt *rx_pkt;
221     struct EBPFRSSContext ebpf_rss;
222 };
223 
224 size_t virtio_net_handle_ctrl_iov(VirtIODevice *vdev,
225                                   const struct iovec *in_sg, unsigned in_num,
226                                   const struct iovec *out_sg,
227                                   unsigned out_num);
228 void virtio_net_set_netclient_name(VirtIONet *n, const char *name,
229                                    const char *type);
230 uint64_t virtio_net_supported_guest_offloads(const VirtIONet *n);
231 
232 #endif
233