mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-28 20:02:17 +00:00
be50da3e9d
Virtio spec introduced a feature VIRTIO_NET_F_GUEST_HDRLEN which when set implicates that device benefits from knowing the exact size of the header. For compatibility, to signal to the device that the header is reliable driver also needs to set this feature. Without this feature set by driver, device has to figure out the header size itself. Quoting the original virtio spec: "hdr_len is a hint to the device as to how much of the header needs to be kept to copy into each packet" "a hint" might not be clear for the reader what does it mean, if it is "maybe like that" of "exactly like that". This feature just makes it crystal clear and let the device count on the hdr_len being filled up by the exact length of header. Also note the spec already has following note about hdr_len: "Due to various bugs in implementations, this field is not useful as a guarantee of the transport header size." Without this feature the device needs to parse the header in core data path handling. Accurate information helps the device to eliminate such header parsing and directly use the hardware accelerators for GSO operation. virtio_net_hdr_from_skb() fills up hdr_len to skb_headlen(skb). The driver already complies to fill the correct value. Introduce the feature and advertise it. Note that virtio spec also includes following note for device implementation: "Caution should be taken by the implementation so as to prevent a malicious driver from attacking the device by setting an incorrect hdr_len." There is a plan to support this feature in our emulated device. A device of SolidRun offers this feature bit. They claim this feature will save the device a few cycles for every GSO packet. Link: https://docs.oasis-open.org/virtio/virtio/v1.2/cs01/virtio-v1.2-cs01.html#x1-230006x3 Signed-off-by: Jiri Pirko <jiri@nvidia.com> Reviewed-by: Parav Pandit <parav@nvidia.com> Reviewed-by: Alvaro Karsz <alvaro.karsz@solid-run.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Willem de Bruijn <willemb@google.com> Link: https://lore.kernel.org/r/20230309094559.917857-1-jiri@resnulli.us Signed-off-by: Jakub Kicinski <kuba@kernel.org>
395 lines
15 KiB
C
395 lines
15 KiB
C
#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 <linux/if_ether.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_NOTF_COAL 53 /* Device supports notifications coalescing */
|
|
#define VIRTIO_NET_F_GUEST_USO4 54 /* Guest can handle USOv4 in. */
|
|
#define VIRTIO_NET_F_GUEST_USO6 55 /* Guest can handle USOv6 in. */
|
|
#define VIRTIO_NET_F_HOST_USO 56 /* Host can handle USO in. */
|
|
#define VIRTIO_NET_F_HASH_REPORT 57 /* Supports hash report */
|
|
#define VIRTIO_NET_F_GUEST_HDRLEN 59 /* Guest provides the exact hdr_len value. */
|
|
#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_UDP_L4 5 /* GSO frame, IPv4& IPv6 UDP (USO) */
|
|
#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
|
|
|
|
/*
|
|
* Control notifications coalescing.
|
|
*
|
|
* Request the device to change the notifications coalescing parameters.
|
|
*
|
|
* Available with the VIRTIO_NET_F_NOTF_COAL feature bit.
|
|
*/
|
|
#define VIRTIO_NET_CTRL_NOTF_COAL 6
|
|
/*
|
|
* Set the tx-usecs/tx-max-packets parameters.
|
|
*/
|
|
struct virtio_net_ctrl_coal_tx {
|
|
/* Maximum number of packets to send before a TX notification */
|
|
__le32 tx_max_packets;
|
|
/* Maximum number of usecs to delay a TX notification */
|
|
__le32 tx_usecs;
|
|
};
|
|
|
|
#define VIRTIO_NET_CTRL_NOTF_COAL_TX_SET 0
|
|
|
|
/*
|
|
* Set the rx-usecs/rx-max-packets parameters.
|
|
*/
|
|
struct virtio_net_ctrl_coal_rx {
|
|
/* Maximum number of packets to receive before a RX notification */
|
|
__le32 rx_max_packets;
|
|
/* Maximum number of usecs to delay a RX notification */
|
|
__le32 rx_usecs;
|
|
};
|
|
|
|
#define VIRTIO_NET_CTRL_NOTF_COAL_RX_SET 1
|
|
|
|
#endif /* _UAPI_LINUX_VIRTIO_NET_H */
|