diff options
| -rw-r--r-- | Documentation/user/virtio.rst | 2 | ||||
| -rw-r--r-- | drivers/net/Kconfig | 7 | ||||
| -rw-r--r-- | drivers/net/Makefile | 1 | ||||
| -rw-r--r-- | drivers/net/virtio.c | 243 | ||||
| -rw-r--r-- | include/linux/virtio_config.h | 7 | ||||
| -rw-r--r-- | include/uapi/linux/virtio_net.h | 358 |
6 files changed, 615 insertions, 3 deletions
diff --git a/Documentation/user/virtio.rst b/Documentation/user/virtio.rst index dde47d5f82..d944fa4821 100644 --- a/Documentation/user/virtio.rst +++ b/Documentation/user/virtio.rst @@ -35,7 +35,7 @@ queues configuration and buffer transfers are nearly identical. Both MMIO and non-legacy PCI are supported in barebox. The VirtIO spec defines a lots of VirtIO device types, however at present only -block, console, input and RNG devices are supported. +block, network, console, input and RNG devices are supported. Build Instructions ------------------ diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig index 397164f3f1..4947296f27 100644 --- a/drivers/net/Kconfig +++ b/drivers/net/Kconfig @@ -258,6 +258,13 @@ config DRIVER_NET_EFI_SNP bool "EFI SNP ethernet driver" depends on EFI_BOOTUP +config DRIVER_NET_VIRTIO + bool "virtio net driver" + depends on VIRTIO + help + This is the virtual net driver for virtio. It can be used with + QEMU based targets. + config DRIVER_NET_AG71XX bool "Atheros AG71xx ethernet driver" depends on MACH_MIPS_ATH79 diff --git a/drivers/net/Makefile b/drivers/net/Makefile index b1aa9571fc..1921d0d9f9 100644 --- a/drivers/net/Makefile +++ b/drivers/net/Makefile @@ -36,4 +36,5 @@ obj-$(CONFIG_DRIVER_NET_SMC91111) += smc91111.o obj-$(CONFIG_DRIVER_NET_TAP) += tap.o obj-$(CONFIG_DRIVER_NET_TSE) += altera_tse.o obj-$(CONFIG_DRIVER_NET_EFI_SNP) += efi-snp.o +obj-$(CONFIG_DRIVER_NET_VIRTIO) += virtio.o obj-$(CONFIG_DRIVER_NET_AG71XX) += ag71xx.o diff --git a/drivers/net/virtio.c b/drivers/net/virtio.c new file mode 100644 index 0000000000..ea4d552903 --- /dev/null +++ b/drivers/net/virtio.c @@ -0,0 +1,243 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2018, Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi> + * Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com> + */ + +#include <common.h> +#include <driver.h> +#include <malloc.h> +#include <net.h> +#include <init.h> +#include <net.h> +#include <linux/virtio.h> +#include <linux/virtio_ring.h> +#include <uapi/linux/virtio_net.h> + +/* Amount of buffers to keep in the RX virtqueue */ +#define VIRTIO_NET_NUM_RX_BUFS 32 + +/* + * This value comes from the VirtIO spec: 1500 for maximum packet size, + * 14 for the Ethernet header, 12 for virtio_net_hdr. In total 1526 bytes. + */ +#define VIRTIO_NET_RX_BUF_SIZE 1526 + +struct virtio_net_priv { + union { + struct virtqueue *vqs[2]; + struct { + struct virtqueue *rx_vq; + struct virtqueue *tx_vq; + }; + }; + + char rx_buff[VIRTIO_NET_NUM_RX_BUFS][VIRTIO_NET_RX_BUF_SIZE]; + bool rx_running; + int net_hdr_len; + struct eth_device edev; + struct virtio_device *vdev; +}; + +static inline struct virtio_net_priv *to_priv(struct eth_device *edev) +{ + return container_of(edev, struct virtio_net_priv, edev); +} + +static int virtio_net_start(struct eth_device *edev) +{ + struct virtio_net_priv *priv = to_priv(edev); + struct virtio_sg sg; + struct virtio_sg *sgs[] = { &sg }; + int i; + + if (!priv->rx_running) { + /* receive buffer length is always 1526 */ + sg.length = VIRTIO_NET_RX_BUF_SIZE; + + /* setup the receive buffer address */ + for (i = 0; i < VIRTIO_NET_NUM_RX_BUFS; i++) { + sg.addr = priv->rx_buff[i]; + virtqueue_add(priv->rx_vq, sgs, 0, 1); + } + + virtqueue_kick(priv->rx_vq); + + /* setup the receive queue only once */ + priv->rx_running = true; + } + + return 0; +} + +static int virtio_net_send(struct eth_device *edev, void *packet, int length) +{ + struct virtio_net_priv *priv = to_priv(edev); + struct virtio_net_hdr_v1 hdr_v1; + struct virtio_net_hdr hdr; + struct virtio_sg hdr_sg; + struct virtio_sg data_sg = { packet, length }; + struct virtio_sg *sgs[] = { &hdr_sg, &data_sg }; + int ret; + + if (priv->net_hdr_len == sizeof(struct virtio_net_hdr)) + hdr_sg.addr = &hdr; + else + hdr_sg.addr = &hdr_v1; + + hdr_sg.length = priv->net_hdr_len; + memset(hdr_sg.addr, 0, priv->net_hdr_len); + + ret = virtqueue_add(priv->tx_vq, sgs, 2, 0); + if (ret) + return ret; + + virtqueue_kick(priv->tx_vq); + + while (1) { + if (virtqueue_get_buf(priv->tx_vq, NULL)) + break; + } + + return 0; +} + +static int virtio_net_recv(struct eth_device *edev) +{ + struct virtio_net_priv *priv = to_priv(edev); + struct virtio_sg sg; + struct virtio_sg *sgs[] = { &sg }; + unsigned int len; + void *buf; + + sg.addr = virtqueue_get_buf(priv->rx_vq, &len); + if (!sg.addr) + return -EAGAIN; + + sg.length = VIRTIO_NET_RX_BUF_SIZE; + + buf = sg.addr + priv->net_hdr_len; + len -= priv->net_hdr_len; + + net_receive(edev, buf, len); + + /* Put the buffer back to the rx ring */ + virtqueue_add(priv->rx_vq, sgs, 0, 1); + + return 0; +} + +static void virtio_net_stop(struct eth_device *dev) +{ + /* + * There is no way to stop the queue from running, unless we issue + * a reset to the virtio device, and re-do the queue initialization + * from the beginning. + */ +} + +static int virtio_net_write_hwaddr(struct eth_device *edev, const unsigned char *adr) +{ + struct virtio_net_priv *priv = to_priv(edev); + int i; + + /* + * v1.0 compliant device's MAC address is set through control channel, + * which we don't support for now. + */ + if (virtio_has_feature(priv->vdev, VIRTIO_F_VERSION_1)) + return -ENOSYS; + + for (i = 0; i < 6; i++) + virtio_cwrite8(priv->vdev, offsetof(struct virtio_net_config, mac) + i, adr[i]); + + return 0; +} + +static int virtio_net_read_rom_hwaddr(struct eth_device *edev, unsigned char *adr) +{ + struct virtio_net_priv *priv = to_priv(edev); + + virtio_cread_bytes(priv->vdev, offsetof(struct virtio_net_config, mac), adr, 6); + + return 0; +} + +static int virtio_net_probe(struct virtio_device *vdev) +{ + struct virtio_net_priv *priv; + struct eth_device *edev; + int ret; + + priv = xzalloc(sizeof(*priv)); + + vdev->priv = priv; + + /* + * For v1.0 compliant device, it always assumes the member + * 'num_buffers' exists in the struct virtio_net_hdr while + * the legacy driver only presented 'num_buffers' when + * VIRTIO_NET_F_MRG_RXBUF was negotiated. Without that feature + * the structure was 2 bytes shorter. + */ + if (virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) + priv->net_hdr_len = sizeof(struct virtio_net_hdr_v1); + else + priv->net_hdr_len = sizeof(struct virtio_net_hdr); + + ret = virtio_find_vqs(vdev, 2, priv->vqs); + if (ret < 0) + return ret; + + priv->vdev = vdev; + + edev = &priv->edev; + edev->priv = priv; + edev->parent = &vdev->dev; + + edev->open = virtio_net_start; + edev->send = virtio_net_send; + edev->recv = virtio_net_recv; + edev->halt = virtio_net_stop; + edev->get_ethaddr = virtio_net_read_rom_hwaddr; + edev->set_ethaddr = virtio_net_write_hwaddr; + + return eth_register(edev); +} + +static void virtio_net_remove(struct virtio_device *vdev) +{ + struct virtio_net_priv *priv = vdev->priv; + + vdev->config->reset(vdev); + eth_unregister(&priv->edev); + vdev->config->del_vqs(vdev); + + free(priv); +} + +/* + * For simplicity, the driver only negotiates the VIRTIO_NET_F_MAC feature. + * For the VIRTIO_NET_F_STATUS feature, we don't negotiate it, hence per spec + * we should assume the link is always active. + */ +static const u32 features[] = { + VIRTIO_NET_F_MAC +}; + +static const struct virtio_device_id id_table[] = { + { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, + { 0 }, +}; + +static struct virtio_driver virtio_net = { + .driver.name = "virtio_net", + .id_table = id_table, + .probe = virtio_net_probe, + .remove = virtio_net_remove, + .feature_table = features, + .feature_table_size = ARRAY_SIZE(features), + .feature_table_legacy = features, + .feature_table_size_legacy = ARRAY_SIZE(features), +}; +device_virtio_driver(virtio_net); diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h index 8160f0952f..6bb1f768b6 100644 --- a/include/linux/virtio_config.h +++ b/include/linux/virtio_config.h @@ -232,8 +232,11 @@ static inline int virtio_get_config(struct virtio_device *vdev, unsigned int off * @len: the length of the buffer * @return 0 if OK, -ve on error */ -int virtio_set_config(struct virtio_device *vdev, unsigned int offset, - void *buf, unsigned int len); +static inline int virtio_set_config(struct virtio_device *vdev, unsigned int offset, + void *buf, unsigned int len) +{ + return vdev->config->set_config(vdev, offset, buf, len); +} /** * virtio_find_vqs() - find virtqueues and instantiate them diff --git a/include/uapi/linux/virtio_net.h b/include/uapi/linux/virtio_net.h new file mode 100644 index 0000000000..c1896b1cfc --- /dev/null +++ b/include/uapi/linux/virtio_net.h @@ -0,0 +1,358 @@ +#ifndef _UAPI_LINUX_VIRTIO_NET_H +#define _UAPI_LINUX_VIRTIO_NET_H +/* This header is BSD licensed so anyone can use the definitions to implement + * compatible drivers/servers. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of IBM nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. */ +#include <linux/types.h> +#include <linux/virtio_ids.h> +#include <linux/virtio_config.h> +#include <linux/virtio_types.h> +#include <net.h> + +/* 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 /* Dynamic offload configuration. */ +#define VIRTIO_NET_F_MTU 3 /* Initial MTU advice */ +#define VIRTIO_NET_F_MAC 5 /* Host has given MAC address. */ +#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_GUEST_ANNOUNCE 21 /* Guest can announce device on the + * network */ +#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_F_HASH_REPORT 57 /* Supports hash report */ +#define VIRTIO_NET_F_RSS 60 /* Supports RSS RX steering */ +#define VIRTIO_NET_F_RSC_EXT 61 /* extended coalescing info */ +#define VIRTIO_NET_F_STANDBY 62 /* Act as standby for another device + * with the same MAC. + */ +#define VIRTIO_NET_F_SPEED_DUPLEX 63 /* Device set linkspeed and duplex */ + +#ifndef VIRTIO_NET_NO_LEGACY +#define VIRTIO_NET_F_GSO 6 /* Host handles pkts w/ any GSO type */ +#endif /* VIRTIO_NET_NO_LEGACY */ + +#define VIRTIO_NET_S_LINK_UP 1 /* Link is up */ +#define VIRTIO_NET_S_ANNOUNCE 2 /* Announcement is needed */ + +/* supported/enabled hash types */ +#define VIRTIO_NET_RSS_HASH_TYPE_IPv4 (1 << 0) +#define VIRTIO_NET_RSS_HASH_TYPE_TCPv4 (1 << 1) +#define VIRTIO_NET_RSS_HASH_TYPE_UDPv4 (1 << 2) +#define VIRTIO_NET_RSS_HASH_TYPE_IPv6 (1 << 3) +#define VIRTIO_NET_RSS_HASH_TYPE_TCPv6 (1 << 4) +#define VIRTIO_NET_RSS_HASH_TYPE_UDPv6 (1 << 5) +#define VIRTIO_NET_RSS_HASH_TYPE_IP_EX (1 << 6) +#define VIRTIO_NET_RSS_HASH_TYPE_TCP_EX (1 << 7) +#define VIRTIO_NET_RSS_HASH_TYPE_UDP_EX (1 << 8) + +struct virtio_net_config { + /* The config defining mac address (if VIRTIO_NET_F_MAC) */ + __u8 mac[ETH_ALEN]; + /* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */ + __virtio16 status; + /* Maximum number of each of transmit and receive queues; + * see VIRTIO_NET_F_MQ and VIRTIO_NET_CTRL_MQ. + * Legal values are between 1 and 0x8000 + */ + __virtio16 max_virtqueue_pairs; + /* Default maximum transmit unit advice */ + __virtio16 mtu; + /* + * speed, in units of 1Mb. All values 0 to INT_MAX are legal. + * Any other value stands for unknown. + */ + __le32 speed; + /* + * 0x00 - half duplex + * 0x01 - full duplex + * Any other value stands for unknown. + */ + __u8 duplex; + /* maximum size of RSS key */ + __u8 rss_max_key_size; + /* maximum number of indirection table entries */ + __le16 rss_max_indirection_table_length; + /* bitmask of supported VIRTIO_NET_RSS_HASH_ types */ + __le32 supported_hash_types; +} __attribute__((packed)); + +/* + * This header comes first in the scatter-gather list. If you don't + * specify GSO or CSUM features, you can simply ignore the header. + * + * This is bitwise-equivalent to the legacy struct virtio_net_hdr_mrg_rxbuf, + * only flattened. + */ +struct virtio_net_hdr_v1 { +#define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 /* Use csum_start, csum_offset */ +#define VIRTIO_NET_HDR_F_DATA_VALID 2 /* Csum is valid */ +#define VIRTIO_NET_HDR_F_RSC_INFO 4 /* rsc info in csum_ fields */ + __u8 flags; +#define VIRTIO_NET_HDR_GSO_NONE 0 /* Not a GSO frame */ +#define VIRTIO_NET_HDR_GSO_TCPV4 1 /* GSO frame, IPv4 TCP (TSO) */ +#define VIRTIO_NET_HDR_GSO_UDP 3 /* GSO frame, IPv4 UDP (UFO) */ +#define VIRTIO_NET_HDR_GSO_TCPV6 4 /* GSO frame, IPv6 TCP */ +#define VIRTIO_NET_HDR_GSO_ECN 0x80 /* TCP has ECN set */ + __u8 gso_type; + __virtio16 hdr_len; /* Ethernet + IP + tcp/udp hdrs */ + __virtio16 gso_size; /* Bytes to append to hdr_len per frame */ + union { + struct { + __virtio16 csum_start; + __virtio16 csum_offset; + }; + /* Checksum calculation */ + struct { + /* Position to start checksumming from */ + __virtio16 start; + /* Offset after that to place checksum */ + __virtio16 offset; + } csum; + /* Receive Segment Coalescing */ + struct { + /* Number of coalesced segments */ + __le16 segments; + /* Number of duplicated acks */ + __le16 dup_acks; + } rsc; + }; + __virtio16 num_buffers; /* Number of merged rx buffers */ +}; + +struct virtio_net_hdr_v1_hash { + struct virtio_net_hdr_v1 hdr; + __le32 hash_value; +#define VIRTIO_NET_HASH_REPORT_NONE 0 +#define VIRTIO_NET_HASH_REPORT_IPv4 1 +#define VIRTIO_NET_HASH_REPORT_TCPv4 2 +#define VIRTIO_NET_HASH_REPORT_UDPv4 3 +#define VIRTIO_NET_HASH_REPORT_IPv6 4 +#define VIRTIO_NET_HASH_REPORT_TCPv6 5 +#define VIRTIO_NET_HASH_REPORT_UDPv6 6 +#define VIRTIO_NET_HASH_REPORT_IPv6_EX 7 +#define VIRTIO_NET_HASH_REPORT_TCPv6_EX 8 +#define VIRTIO_NET_HASH_REPORT_UDPv6_EX 9 + __le16 hash_report; + __le16 padding; +}; + +#ifndef VIRTIO_NET_NO_LEGACY +/* This header comes first in the scatter-gather list. + * For legacy virtio, if VIRTIO_F_ANY_LAYOUT is not negotiated, it must + * be the first element of the scatter-gather list. If you don't + * specify GSO or CSUM features, you can simply ignore the header. */ +struct virtio_net_hdr { + /* See VIRTIO_NET_HDR_F_* */ + __u8 flags; + /* See VIRTIO_NET_HDR_GSO_* */ + __u8 gso_type; + __virtio16 hdr_len; /* Ethernet + IP + tcp/udp hdrs */ + __virtio16 gso_size; /* Bytes to append to hdr_len per frame */ + __virtio16 csum_start; /* Position to start checksumming from */ + __virtio16 csum_offset; /* Offset after that to place checksum */ +}; + +/* This is the version of the header to use when the MRG_RXBUF + * feature has been negotiated. */ +struct virtio_net_hdr_mrg_rxbuf { + struct virtio_net_hdr hdr; + __virtio16 num_buffers; /* Number of merged rx buffers */ +}; +#endif /* ...VIRTIO_NET_NO_LEGACY */ + +/* + * 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 { + __u8 class; + __u8 cmd; +} __attribute__((packed)); + +typedef __u8 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 { + __virtio32 entries; + __u8 macs[][ETH_ALEN]; +} __attribute__((packed)); + +#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 link announce acknowledgement + * + * The command VIRTIO_NET_CTRL_ANNOUNCE_ACK is used to indicate that + * driver has recevied the notification; device would clear the + * VIRTIO_NET_S_ANNOUNCE bit in the status field after it receives + * this command. + */ +#define VIRTIO_NET_CTRL_ANNOUNCE 3 + #define VIRTIO_NET_CTRL_ANNOUNCE_ACK 0 + +/* + * Control Receive Flow Steering + */ +#define VIRTIO_NET_CTRL_MQ 4 +/* + * The command VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET + * enables Receive Flow Steering, 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 { + __virtio16 virtqueue_pairs; +}; + + #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 + +/* + * The command VIRTIO_NET_CTRL_MQ_RSS_CONFIG has the same effect as + * VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET does and additionally configures + * the receive steering to use a hash calculated for incoming packet + * to decide on receive virtqueue to place the packet. The command + * also provides parameters to calculate a hash and receive virtqueue. + */ +struct virtio_net_rss_config { + __le32 hash_types; + __le16 indirection_table_mask; + __le16 unclassified_queue; + __le16 indirection_table[1/* + indirection_table_mask */]; + __le16 max_tx_vq; + __u8 hash_key_length; + __u8 hash_key_data[/* hash_key_length */]; +}; + + #define VIRTIO_NET_CTRL_MQ_RSS_CONFIG 1 + +/* + * The command VIRTIO_NET_CTRL_MQ_HASH_CONFIG requests the device + * to include in the virtio header of the packet the value of the + * calculated hash and the report type of hash. It also provides + * parameters for hash calculation. The command requires feature + * VIRTIO_NET_F_HASH_REPORT to be negotiated to extend the + * layout of virtio header as defined in virtio_net_hdr_v1_hash. + */ +struct virtio_net_hash_config { + __le32 hash_types; + /* for compatibility with virtio_net_rss_config */ + __le16 reserved[4]; + __u8 hash_key_length; + __u8 hash_key_data[/* hash_key_length */]; +}; + + #define VIRTIO_NET_CTRL_MQ_HASH_CONFIG 2 + +/* + * Control network offloads + * + * Reconfigures the network offloads that Guest can handle. + * + * Available with the VIRTIO_NET_F_CTRL_GUEST_OFFLOADS feature bit. + * + * Command data format matches the feature bit mask exactly. + * + * See VIRTIO_NET_F_GUEST_* for the list of offloads + * that can be enabled/disabled. + */ +#define VIRTIO_NET_CTRL_GUEST_OFFLOADS 5 +#define VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET 0 + +#endif /* _UAPI_LINUX_VIRTIO_NET_H */ |