Old qemu versions required that 1st s/g entry is the header. Since QEMU 1.5, patchset titled "virtio-net: iovec handling cleanup" removed this limitation but a feature bit is needed so guests know it's safe to lay out header differently. This patch applies on top and adds such a feature bit to QEMU. It is set by default for virtio-net. virtio net header inline with the data is beneficial for latency and small packet bandwidth - guest driver code utilizing this feature has been acked but missed 3.11 by a narrow margin, it's pending for 3.12. This feature bit is cleared by default when compatibility with old machine types is requested. Other performance-sensitive devices (blk and scsi) don't yet support arbitrary s/g layouts, so we only set this bit for virtio-net for now. There are plans to allow arbitrary layouts there, but no code has been posted yet. Cc: Rusty Russell <rusty@rustcorp.com.au> Reviewed-by: Laszlo Ersek <lersek@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
278 lines
10 KiB
C
278 lines
10 KiB
C
/*
|
|
* Virtio Network Device
|
|
*
|
|
* Copyright IBM, Corp. 2007
|
|
*
|
|
* Authors:
|
|
* Anthony Liguori <aliguori@us.ibm.com>
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2. See
|
|
* the COPYING file in the top-level directory.
|
|
*
|
|
*/
|
|
|
|
#ifndef _QEMU_VIRTIO_NET_H
|
|
#define _QEMU_VIRTIO_NET_H
|
|
|
|
#include "hw/virtio/virtio.h"
|
|
#include "hw/pci/pci.h"
|
|
|
|
#define TYPE_VIRTIO_NET "virtio-net-device"
|
|
#define VIRTIO_NET(obj) \
|
|
OBJECT_CHECK(VirtIONet, (obj), TYPE_VIRTIO_NET)
|
|
|
|
#define ETH_ALEN 6
|
|
|
|
/* from Linux's virtio_net.h */
|
|
|
|
/* The ID for virtio_net */
|
|
#define VIRTIO_ID_NET 1
|
|
|
|
/* The feature bitmap for virtio net */
|
|
#define VIRTIO_NET_F_CSUM 0 /* Host handles pkts w/ partial csum */
|
|
#define VIRTIO_NET_F_GUEST_CSUM 1 /* Guest handles pkts w/ partial csum */
|
|
#define VIRTIO_NET_F_CTRL_GUEST_OFFLOADS 2 /* Control channel offload
|
|
* configuration support */
|
|
#define VIRTIO_NET_F_MAC 5 /* Host has given MAC address. */
|
|
#define VIRTIO_NET_F_GSO 6 /* Host handles pkts w/ any GSO type */
|
|
#define VIRTIO_NET_F_GUEST_TSO4 7 /* Guest can handle TSOv4 in. */
|
|
#define VIRTIO_NET_F_GUEST_TSO6 8 /* Guest can handle TSOv6 in. */
|
|
#define VIRTIO_NET_F_GUEST_ECN 9 /* Guest can handle TSO[6] w/ ECN in. */
|
|
#define VIRTIO_NET_F_GUEST_UFO 10 /* Guest can handle UFO in. */
|
|
#define VIRTIO_NET_F_HOST_TSO4 11 /* Host can handle TSOv4 in. */
|
|
#define VIRTIO_NET_F_HOST_TSO6 12 /* Host can handle TSOv6 in. */
|
|
#define VIRTIO_NET_F_HOST_ECN 13 /* Host can handle TSO[6] w/ ECN in. */
|
|
#define VIRTIO_NET_F_HOST_UFO 14 /* Host can handle UFO in. */
|
|
#define VIRTIO_NET_F_MRG_RXBUF 15 /* Host can merge receive buffers. */
|
|
#define VIRTIO_NET_F_STATUS 16 /* virtio_net_config.status available */
|
|
#define VIRTIO_NET_F_CTRL_VQ 17 /* Control channel available */
|
|
#define VIRTIO_NET_F_CTRL_RX 18 /* Control channel RX mode support */
|
|
#define VIRTIO_NET_F_CTRL_VLAN 19 /* Control channel VLAN filtering */
|
|
#define VIRTIO_NET_F_CTRL_RX_EXTRA 20 /* Extra RX mode control support */
|
|
#define VIRTIO_NET_F_MQ 22 /* Device supports Receive Flow
|
|
* Steering */
|
|
|
|
#define VIRTIO_NET_F_CTRL_MAC_ADDR 23 /* Set MAC address */
|
|
|
|
#define VIRTIO_NET_S_LINK_UP 1 /* Link is up */
|
|
|
|
#define TX_TIMER_INTERVAL 150000 /* 150 us */
|
|
|
|
/* Limit the number of packets that can be sent via a single flush
|
|
* of the TX queue. This gives us a guaranteed exit condition and
|
|
* ensures fairness in the io path. 256 conveniently matches the
|
|
* length of the TX queue and shows a good balance of performance
|
|
* and latency. */
|
|
#define TX_BURST 256
|
|
|
|
typedef struct virtio_net_conf
|
|
{
|
|
uint32_t txtimer;
|
|
int32_t txburst;
|
|
char *tx;
|
|
} virtio_net_conf;
|
|
|
|
/* Maximum packet size we can receive from tap device: header + 64k */
|
|
#define VIRTIO_NET_MAX_BUFSIZE (sizeof(struct virtio_net_hdr) + (64 << 10))
|
|
|
|
struct virtio_net_config
|
|
{
|
|
/* The config defining mac address ($ETH_ALEN bytes) */
|
|
uint8_t mac[ETH_ALEN];
|
|
/* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */
|
|
uint16_t status;
|
|
/* Max virtqueue pairs supported by the device */
|
|
uint16_t max_virtqueue_pairs;
|
|
} QEMU_PACKED;
|
|
|
|
/*
|
|
* Control virtqueue data structures
|
|
*
|
|
* The control virtqueue expects a header in the first sg entry
|
|
* and an ack/status response in the last entry. Data for the
|
|
* command goes in between.
|
|
*/
|
|
struct virtio_net_ctrl_hdr {
|
|
uint8_t class;
|
|
uint8_t cmd;
|
|
};
|
|
|
|
typedef uint8_t virtio_net_ctrl_ack;
|
|
|
|
#define VIRTIO_NET_OK 0
|
|
#define VIRTIO_NET_ERR 1
|
|
|
|
/*
|
|
* Control the RX mode, ie. promisucous, allmulti, etc...
|
|
* All commands require an "out" sg entry containing a 1 byte
|
|
* state value, zero = disable, non-zero = enable. Commands
|
|
* 0 and 1 are supported with the VIRTIO_NET_F_CTRL_RX feature.
|
|
* Commands 2-5 are added with VIRTIO_NET_F_CTRL_RX_EXTRA.
|
|
*/
|
|
#define VIRTIO_NET_CTRL_RX 0
|
|
#define VIRTIO_NET_CTRL_RX_PROMISC 0
|
|
#define VIRTIO_NET_CTRL_RX_ALLMULTI 1
|
|
#define VIRTIO_NET_CTRL_RX_ALLUNI 2
|
|
#define VIRTIO_NET_CTRL_RX_NOMULTI 3
|
|
#define VIRTIO_NET_CTRL_RX_NOUNI 4
|
|
#define VIRTIO_NET_CTRL_RX_NOBCAST 5
|
|
|
|
/*
|
|
* Control the MAC
|
|
*
|
|
* The MAC filter table is managed by the hypervisor, the guest should
|
|
* assume the size is infinite. Filtering should be considered
|
|
* non-perfect, ie. based on hypervisor resources, the guest may
|
|
* received packets from sources not specified in the filter list.
|
|
*
|
|
* In addition to the class/cmd header, the TABLE_SET command requires
|
|
* two out scatterlists. Each contains a 4 byte count of entries followed
|
|
* by a concatenated byte stream of the ETH_ALEN MAC addresses. The
|
|
* first sg list contains unicast addresses, the second is for multicast.
|
|
* This functionality is present if the VIRTIO_NET_F_CTRL_RX feature
|
|
* is available.
|
|
*
|
|
* The ADDR_SET command requests one out scatterlist, it contains a
|
|
* 6 bytes MAC address. This functionality is present if the
|
|
* VIRTIO_NET_F_CTRL_MAC_ADDR feature is available.
|
|
*/
|
|
struct virtio_net_ctrl_mac {
|
|
uint32_t entries;
|
|
uint8_t macs[][ETH_ALEN];
|
|
};
|
|
|
|
typedef struct VirtIONetQueue {
|
|
VirtQueue *rx_vq;
|
|
VirtQueue *tx_vq;
|
|
QEMUTimer *tx_timer;
|
|
QEMUBH *tx_bh;
|
|
int tx_waiting;
|
|
struct {
|
|
VirtQueueElement elem;
|
|
ssize_t len;
|
|
} async_tx;
|
|
struct VirtIONet *n;
|
|
} VirtIONetQueue;
|
|
|
|
typedef struct VirtIONet {
|
|
VirtIODevice parent_obj;
|
|
uint8_t mac[ETH_ALEN];
|
|
uint16_t status;
|
|
VirtIONetQueue *vqs;
|
|
VirtQueue *ctrl_vq;
|
|
NICState *nic;
|
|
uint32_t tx_timeout;
|
|
int32_t tx_burst;
|
|
uint32_t has_vnet_hdr;
|
|
size_t host_hdr_len;
|
|
size_t guest_hdr_len;
|
|
uint8_t has_ufo;
|
|
int mergeable_rx_bufs;
|
|
uint8_t promisc;
|
|
uint8_t allmulti;
|
|
uint8_t alluni;
|
|
uint8_t nomulti;
|
|
uint8_t nouni;
|
|
uint8_t nobcast;
|
|
uint8_t vhost_started;
|
|
struct {
|
|
int in_use;
|
|
int first_multi;
|
|
uint8_t multi_overflow;
|
|
uint8_t uni_overflow;
|
|
uint8_t *macs;
|
|
} mac_table;
|
|
uint32_t *vlans;
|
|
virtio_net_conf net_conf;
|
|
NICConf nic_conf;
|
|
DeviceState *qdev;
|
|
int multiqueue;
|
|
uint16_t max_queues;
|
|
uint16_t curr_queues;
|
|
size_t config_size;
|
|
char *netclient_name;
|
|
char *netclient_type;
|
|
uint64_t curr_guest_offloads;
|
|
} VirtIONet;
|
|
|
|
#define VIRTIO_NET_CTRL_MAC 1
|
|
#define VIRTIO_NET_CTRL_MAC_TABLE_SET 0
|
|
#define VIRTIO_NET_CTRL_MAC_ADDR_SET 1
|
|
|
|
/*
|
|
* Control VLAN filtering
|
|
*
|
|
* The VLAN filter table is controlled via a simple ADD/DEL interface.
|
|
* VLAN IDs not added may be filterd by the hypervisor. Del is the
|
|
* opposite of add. Both commands expect an out entry containing a 2
|
|
* byte VLAN ID. VLAN filterting is available with the
|
|
* VIRTIO_NET_F_CTRL_VLAN feature bit.
|
|
*/
|
|
#define VIRTIO_NET_CTRL_VLAN 2
|
|
#define VIRTIO_NET_CTRL_VLAN_ADD 0
|
|
#define VIRTIO_NET_CTRL_VLAN_DEL 1
|
|
|
|
/*
|
|
* Control Multiqueue
|
|
*
|
|
* The command VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET
|
|
* enables multiqueue, specifying the number of the transmit and
|
|
* receive queues that will be used. After the command is consumed and acked by
|
|
* the device, the device will not steer new packets on receive virtqueues
|
|
* other than specified nor read from transmit virtqueues other than specified.
|
|
* Accordingly, driver should not transmit new packets on virtqueues other than
|
|
* specified.
|
|
*/
|
|
struct virtio_net_ctrl_mq {
|
|
uint16_t virtqueue_pairs;
|
|
};
|
|
|
|
#define VIRTIO_NET_CTRL_MQ 4
|
|
#define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET 0
|
|
#define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN 1
|
|
#define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX 0x8000
|
|
|
|
/*
|
|
* Control network offloads
|
|
*
|
|
* Dynamic offloads are available with the
|
|
* VIRTIO_NET_F_CTRL_GUEST_OFFLOADS feature bit.
|
|
*/
|
|
#define VIRTIO_NET_CTRL_GUEST_OFFLOADS 5
|
|
#define VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET 0
|
|
|
|
#define DEFINE_VIRTIO_NET_FEATURES(_state, _field) \
|
|
DEFINE_VIRTIO_COMMON_FEATURES(_state, _field), \
|
|
DEFINE_PROP_BIT("any_layout", _state, _field, VIRTIO_F_ANY_LAYOUT, true), \
|
|
DEFINE_PROP_BIT("csum", _state, _field, VIRTIO_NET_F_CSUM, true), \
|
|
DEFINE_PROP_BIT("guest_csum", _state, _field, VIRTIO_NET_F_GUEST_CSUM, true), \
|
|
DEFINE_PROP_BIT("gso", _state, _field, VIRTIO_NET_F_GSO, true), \
|
|
DEFINE_PROP_BIT("guest_tso4", _state, _field, VIRTIO_NET_F_GUEST_TSO4, true), \
|
|
DEFINE_PROP_BIT("guest_tso6", _state, _field, VIRTIO_NET_F_GUEST_TSO6, true), \
|
|
DEFINE_PROP_BIT("guest_ecn", _state, _field, VIRTIO_NET_F_GUEST_ECN, true), \
|
|
DEFINE_PROP_BIT("guest_ufo", _state, _field, VIRTIO_NET_F_GUEST_UFO, true), \
|
|
DEFINE_PROP_BIT("host_tso4", _state, _field, VIRTIO_NET_F_HOST_TSO4, true), \
|
|
DEFINE_PROP_BIT("host_tso6", _state, _field, VIRTIO_NET_F_HOST_TSO6, true), \
|
|
DEFINE_PROP_BIT("host_ecn", _state, _field, VIRTIO_NET_F_HOST_ECN, true), \
|
|
DEFINE_PROP_BIT("host_ufo", _state, _field, VIRTIO_NET_F_HOST_UFO, true), \
|
|
DEFINE_PROP_BIT("mrg_rxbuf", _state, _field, VIRTIO_NET_F_MRG_RXBUF, true), \
|
|
DEFINE_PROP_BIT("status", _state, _field, VIRTIO_NET_F_STATUS, true), \
|
|
DEFINE_PROP_BIT("ctrl_vq", _state, _field, VIRTIO_NET_F_CTRL_VQ, true), \
|
|
DEFINE_PROP_BIT("ctrl_rx", _state, _field, VIRTIO_NET_F_CTRL_RX, true), \
|
|
DEFINE_PROP_BIT("ctrl_vlan", _state, _field, VIRTIO_NET_F_CTRL_VLAN, true), \
|
|
DEFINE_PROP_BIT("ctrl_rx_extra", _state, _field, VIRTIO_NET_F_CTRL_RX_EXTRA, true), \
|
|
DEFINE_PROP_BIT("ctrl_mac_addr", _state, _field, VIRTIO_NET_F_CTRL_MAC_ADDR, true), \
|
|
DEFINE_PROP_BIT("ctrl_guest_offloads", _state, _field, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, true), \
|
|
DEFINE_PROP_BIT("mq", _state, _field, VIRTIO_NET_F_MQ, false)
|
|
|
|
#define DEFINE_VIRTIO_NET_PROPERTIES(_state, _field) \
|
|
DEFINE_PROP_UINT32("x-txtimer", _state, _field.txtimer, TX_TIMER_INTERVAL),\
|
|
DEFINE_PROP_INT32("x-txburst", _state, _field.txburst, TX_BURST), \
|
|
DEFINE_PROP_STRING("tx", _state, _field.tx)
|
|
|
|
void virtio_net_set_config_size(VirtIONet *n, uint32_t host_features);
|
|
void virtio_net_set_netclient_name(VirtIONet *n, const char *name,
|
|
const char *type);
|
|
|
|
#endif
|