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- s/recevied/received/ MFC after: 3 days
555 lines
18 KiB
C
555 lines
18 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* This header is BSD licensed so anyone can use the definitions to implement
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* compatible drivers/servers.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of IBM nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _VIRTIO_NET_H
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#define _VIRTIO_NET_H
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/* The feature bitmap for virtio net */
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#define VIRTIO_NET_F_CSUM 0x000001 /* Host handles pkts w/ partial csum */
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#define VIRTIO_NET_F_GUEST_CSUM 0x000002 /* Guest handles pkts w/ partial csum*/
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#define VIRTIO_NET_F_CTRL_GUEST_OFFLOADS 0x000004 /* Dynamic offload configuration. */
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#define VIRTIO_NET_F_MTU 0x000008 /* Initial MTU advice */
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#define VIRTIO_NET_F_MAC 0x000020 /* Host has given MAC address. */
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#define VIRTIO_NET_F_GSO 0x000040 /* Host handles pkts w/ any GSO type */
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#define VIRTIO_NET_F_GUEST_TSO4 0x000080 /* Guest can handle TSOv4 in. */
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#define VIRTIO_NET_F_GUEST_TSO6 0x000100 /* Guest can handle TSOv6 in. */
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#define VIRTIO_NET_F_GUEST_ECN 0x000200 /* Guest can handle TSO[6] w/ ECN in. */
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#define VIRTIO_NET_F_GUEST_UFO 0x000400 /* Guest can handle UFO in. */
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#define VIRTIO_NET_F_HOST_TSO4 0x000800 /* Host can handle TSOv4 in. */
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#define VIRTIO_NET_F_HOST_TSO6 0x001000 /* Host can handle TSOv6 in. */
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#define VIRTIO_NET_F_HOST_ECN 0x002000 /* Host can handle TSO[6] w/ ECN in. */
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#define VIRTIO_NET_F_HOST_UFO 0x004000 /* Host can handle UFO in. */
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#define VIRTIO_NET_F_MRG_RXBUF 0x008000 /* Host can merge receive buffers. */
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#define VIRTIO_NET_F_STATUS 0x010000 /* virtio_net_config.status available*/
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#define VIRTIO_NET_F_CTRL_VQ 0x020000 /* Control channel available */
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#define VIRTIO_NET_F_CTRL_RX 0x040000 /* Control channel RX mode support */
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#define VIRTIO_NET_F_CTRL_VLAN 0x080000 /* Control channel VLAN filtering */
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#define VIRTIO_NET_F_CTRL_RX_EXTRA 0x100000 /* Extra RX mode control support */
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#define VIRTIO_NET_F_GUEST_ANNOUNCE 0x200000 /* Announce device on network */
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#define VIRTIO_NET_F_MQ 0x400000 /* Device supports Receive Flow Steering */
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#define VIRTIO_NET_F_CTRL_MAC_ADDR 0x800000 /* Set MAC address */
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#define VIRTIO_NET_F_SPEED_DUPLEX (1ULL << 63) /* Device set linkspeed and duplex */
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#define VIRTIO_NET_S_LINK_UP 1 /* Link is up */
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#define VIRTIO_NET_S_ANNOUNCE 2 /* Announcement is needed */
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struct virtio_net_config {
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/* The config defining mac address (if VIRTIO_NET_F_MAC) */
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uint8_t mac[ETHER_ADDR_LEN];
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/* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */
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uint16_t status;
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/* Maximum number of each of transmit and receive queues;
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* see VIRTIO_NET_F_MQ and VIRTIO_NET_CTRL_MQ.
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* Legal values are between 1 and 0x8000.
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*/
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uint16_t max_virtqueue_pairs;
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/* Default maximum transmit unit advice */
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uint16_t mtu;
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/*
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* speed, in units of 1Mb. All values 0 to INT_MAX are legal.
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* Any other value stands for unknown.
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*/
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uint32_t speed;
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/*
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* 0x00 - half duplex
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* 0x01 - full duplex
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* Any other value stands for unknown.
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*/
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uint8_t duplex;
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} __packed;
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/*
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* This header comes first in the scatter-gather list. If you don't
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* specify GSO or CSUM features, you can simply ignore the header.
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*
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* This is bitwise-equivalent to the legacy struct virtio_net_hdr_mrg_rxbuf,
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* only flattened.
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*/
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struct virtio_net_hdr_v1 {
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#define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 /* Use csum_start, csum_offset */
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#define VIRTIO_NET_HDR_F_DATA_VALID 2 /* Csum is valid */
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uint8_t flags;
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#define VIRTIO_NET_HDR_GSO_NONE 0 /* Not a GSO frame */
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#define VIRTIO_NET_HDR_GSO_TCPV4 1 /* GSO frame, IPv4 TCP (TSO) */
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#define VIRTIO_NET_HDR_GSO_UDP 3 /* GSO frame, IPv4 UDP (UFO) */
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#define VIRTIO_NET_HDR_GSO_TCPV6 4 /* GSO frame, IPv6 TCP */
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#define VIRTIO_NET_HDR_GSO_ECN 0x80 /* TCP has ECN set */
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uint8_t gso_type;
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uint16_t hdr_len; /* Ethernet + IP + tcp/udp hdrs */
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uint16_t gso_size; /* Bytes to append to hdr_len per frame */
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uint16_t csum_start; /* Position to start checksumming from */
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uint16_t csum_offset; /* Offset after that to place checksum */
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uint16_t num_buffers; /* Number of merged rx buffers */
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};
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/*
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* This header comes first in the scatter-gather list.
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* For legacy virtio, if VIRTIO_F_ANY_LAYOUT is not negotiated, it must
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* be the first element of the scatter-gather list. If you don't
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* specify GSO or CSUM features, you can simply ignore the header.
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*/
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struct virtio_net_hdr {
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/* See VIRTIO_NET_HDR_F_* */
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uint8_t flags;
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/* See VIRTIO_NET_HDR_GSO_* */
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uint8_t gso_type;
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uint16_t hdr_len; /* Ethernet + IP + tcp/udp hdrs */
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uint16_t gso_size; /* Bytes to append to hdr_len per frame */
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uint16_t csum_start; /* Position to start checksumming from */
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uint16_t csum_offset; /* Offset after that to place checksum */
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};
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/*
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* This is the version of the header to use when the MRG_RXBUF
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* feature has been negotiated.
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*/
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struct virtio_net_hdr_mrg_rxbuf {
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struct virtio_net_hdr hdr;
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uint16_t num_buffers; /* Number of merged rx buffers */
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};
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/*
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* Control virtqueue data structures
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*
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* The control virtqueue expects a header in the first sg entry
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* and an ack/status response in the last entry. Data for the
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* command goes in between.
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*/
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struct virtio_net_ctrl_hdr {
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uint8_t class;
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uint8_t cmd;
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} __packed;
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#define VIRTIO_NET_OK 0
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#define VIRTIO_NET_ERR 1
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/*
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* Control the RX mode, ie. promiscuous, allmulti, etc...
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* All commands require an "out" sg entry containing a 1 byte
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* state value, zero = disable, non-zero = enable. Commands
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* 0 and 1 are supported with the VIRTIO_NET_F_CTRL_RX feature.
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* Commands 2-5 are added with VIRTIO_NET_F_CTRL_RX_EXTRA.
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*/
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#define VIRTIO_NET_CTRL_RX 0
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#define VIRTIO_NET_CTRL_RX_PROMISC 0
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#define VIRTIO_NET_CTRL_RX_ALLMULTI 1
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#define VIRTIO_NET_CTRL_RX_ALLUNI 2
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#define VIRTIO_NET_CTRL_RX_NOMULTI 3
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#define VIRTIO_NET_CTRL_RX_NOUNI 4
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#define VIRTIO_NET_CTRL_RX_NOBCAST 5
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/*
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* Control the MAC filter table.
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*
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* The MAC filter table is managed by the hypervisor, the guest should
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* assume the size is infinite. Filtering should be considered
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* non-perfect, ie. based on hypervisor resources, the guest may
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* received packets from sources not specified in the filter list.
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*
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* In addition to the class/cmd header, the TABLE_SET command requires
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* two out scatterlists. Each contains a 4 byte count of entries followed
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* by a concatenated byte stream of the ETH_ALEN MAC addresses. The
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* first sg list contains unicast addresses, the second is for multicast.
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* This functionality is present if the VIRTIO_NET_F_CTRL_RX feature
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* is available.
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*
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* The ADDR_SET command requests one out scatterlist, it contains a
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* 6 bytes MAC address. This functionality is present if the
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* VIRTIO_NET_F_CTRL_MAC_ADDR feature is available.
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*/
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struct virtio_net_ctrl_mac {
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uint32_t entries;
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uint8_t macs[][ETHER_ADDR_LEN];
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} __packed;
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#define VIRTIO_NET_CTRL_MAC 1
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#define VIRTIO_NET_CTRL_MAC_TABLE_SET 0
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#define VIRTIO_NET_CTRL_MAC_ADDR_SET 1
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/*
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* Control VLAN filtering
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*
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* The VLAN filter table is controlled via a simple ADD/DEL interface.
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* VLAN IDs not added may be filtered by the hypervisor. Del is the
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* opposite of add. Both commands expect an out entry containing a 2
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* byte VLAN ID. VLAN filtering is available with the
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* VIRTIO_NET_F_CTRL_VLAN feature bit.
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*/
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#define VIRTIO_NET_CTRL_VLAN 2
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#define VIRTIO_NET_CTRL_VLAN_ADD 0
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#define VIRTIO_NET_CTRL_VLAN_DEL 1
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/*
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* Control link announce acknowledgement
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*
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* The command VIRTIO_NET_CTRL_ANNOUNCE_ACK is used to indicate that
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* driver has received the notification; device would clear the
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* VIRTIO_NET_S_ANNOUNCE bit in the status field after it receives
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* this command.
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*/
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#define VIRTIO_NET_CTRL_ANNOUNCE 3
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#define VIRTIO_NET_CTRL_ANNOUNCE_ACK 0
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/*
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* Control Receive Flow Steering
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*
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* The command VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET enables Receive Flow
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* Steering, specifying the number of the transmit and receive queues
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* that will be used. After the command is consumed and acked by the
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* device, the device will not steer new packets on receive virtqueues
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* other than specified nor read from transmit virtqueues other than
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* specified. Accordingly, driver should not transmit new packets on
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* virtqueues other than specified.
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*/
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struct virtio_net_ctrl_mq {
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uint16_t virtqueue_pairs;
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} __packed;
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#define VIRTIO_NET_CTRL_MQ 4
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#define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET 0
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#define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN 1
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#define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX 0x8000
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/*
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* Control network offloads
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*
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* Reconfigures the network offloads that Guest can handle.
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*
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* Available with the VIRTIO_NET_F_CTRL_GUEST_OFFLOADS feature bit.
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*
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* Command data format matches the feature bit mask exactly.
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*
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* See VIRTIO_NET_F_GUEST_* for the list of offloads
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* that can be enabled/disabled.
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*/
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#define VIRTIO_NET_CTRL_GUEST_OFFLOADS 5
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#define VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET 0
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/*
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* Use the checksum offset in the VirtIO header to set the
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* correct CSUM_* flags.
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*/
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static inline int
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virtio_net_rx_csum_by_offset(struct mbuf *m, uint16_t eth_type, int ip_start,
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struct virtio_net_hdr *hdr)
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{
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#if defined(INET) || defined(INET6)
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int offset = hdr->csum_start + hdr->csum_offset;
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#endif
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/* Only do a basic sanity check on the offset. */
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switch (eth_type) {
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#if defined(INET)
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case ETHERTYPE_IP:
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if (__predict_false(offset < ip_start + sizeof(struct ip)))
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return (1);
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break;
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#endif
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#if defined(INET6)
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case ETHERTYPE_IPV6:
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if (__predict_false(offset < ip_start + sizeof(struct ip6_hdr)))
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return (1);
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break;
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#endif
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default:
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/* Here we should increment the rx_csum_bad_ethtype counter. */
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return (1);
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}
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/*
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* Use the offset to determine the appropriate CSUM_* flags. This is
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* a bit dirty, but we can get by with it since the checksum offsets
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* happen to be different. We assume the host host does not do IPv4
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* header checksum offloading.
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*/
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switch (hdr->csum_offset) {
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case offsetof(struct udphdr, uh_sum):
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case offsetof(struct tcphdr, th_sum):
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m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
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m->m_pkthdr.csum_data = 0xFFFF;
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break;
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default:
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/* Here we should increment the rx_csum_bad_offset counter. */
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return (1);
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}
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return (0);
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}
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static inline int
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virtio_net_rx_csum_by_parse(struct mbuf *m, uint16_t eth_type, int ip_start,
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struct virtio_net_hdr *hdr)
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{
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int offset, proto;
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switch (eth_type) {
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#if defined(INET)
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case ETHERTYPE_IP: {
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struct ip *ip;
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if (__predict_false(m->m_len < ip_start + sizeof(struct ip)))
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return (1);
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ip = (struct ip *)(m->m_data + ip_start);
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proto = ip->ip_p;
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offset = ip_start + (ip->ip_hl << 2);
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break;
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}
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#endif
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#if defined(INET6)
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case ETHERTYPE_IPV6:
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if (__predict_false(m->m_len < ip_start +
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sizeof(struct ip6_hdr)))
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return (1);
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offset = ip6_lasthdr(m, ip_start, IPPROTO_IPV6, &proto);
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if (__predict_false(offset < 0))
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return (1);
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break;
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#endif
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default:
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/* Here we should increment the rx_csum_bad_ethtype counter. */
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return (1);
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}
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switch (proto) {
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case IPPROTO_TCP:
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if (__predict_false(m->m_len < offset + sizeof(struct tcphdr)))
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return (1);
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m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
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m->m_pkthdr.csum_data = 0xFFFF;
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break;
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case IPPROTO_UDP:
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if (__predict_false(m->m_len < offset + sizeof(struct udphdr)))
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return (1);
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m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
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m->m_pkthdr.csum_data = 0xFFFF;
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break;
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default:
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/*
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* For the remaining protocols, FreeBSD does not support
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* checksum offloading, so the checksum will be recomputed.
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*/
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#if 0
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if_printf(ifp, "cksum offload of unsupported "
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"protocol eth_type=%#x proto=%d csum_start=%d "
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"csum_offset=%d\n", __func__, eth_type, proto,
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hdr->csum_start, hdr->csum_offset);
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#endif
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break;
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}
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return (0);
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}
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/*
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* Set the appropriate CSUM_* flags. Unfortunately, the information
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* provided is not directly useful to us. The VirtIO header gives the
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* offset of the checksum, which is all Linux needs, but this is not
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* how FreeBSD does things. We are forced to peek inside the packet
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* a bit.
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*
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* It would be nice if VirtIO gave us the L4 protocol or if FreeBSD
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* could accept the offsets and let the stack figure it out.
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*/
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static inline int
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virtio_net_rx_csum(struct mbuf *m, struct virtio_net_hdr *hdr)
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{
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struct ether_header *eh;
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struct ether_vlan_header *evh;
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uint16_t eth_type;
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int offset, error;
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if ((hdr->flags & (VIRTIO_NET_HDR_F_NEEDS_CSUM |
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VIRTIO_NET_HDR_F_DATA_VALID)) == 0) {
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return (0);
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}
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eh = mtod(m, struct ether_header *);
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eth_type = ntohs(eh->ether_type);
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if (eth_type == ETHERTYPE_VLAN) {
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/* BMV: We should handle nested VLAN tags too. */
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evh = mtod(m, struct ether_vlan_header *);
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eth_type = ntohs(evh->evl_proto);
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offset = sizeof(struct ether_vlan_header);
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} else
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offset = sizeof(struct ether_header);
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if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM)
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error = virtio_net_rx_csum_by_offset(m, eth_type, offset, hdr);
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else
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error = virtio_net_rx_csum_by_parse(m, eth_type, offset, hdr);
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return (error);
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}
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static inline int
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virtio_net_tx_offload_ctx(struct mbuf *m, int *etype, int *proto, int *start)
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{
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struct ether_vlan_header *evh;
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#if defined(INET) || defined(INET6)
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int offset;
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#endif
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evh = mtod(m, struct ether_vlan_header *);
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if (evh->evl_encap_proto == htons(ETHERTYPE_VLAN)) {
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/* BMV: We should handle nested VLAN tags too. */
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*etype = ntohs(evh->evl_proto);
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#if defined(INET) || defined(INET6)
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offset = sizeof(struct ether_vlan_header);
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#endif
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} else {
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*etype = ntohs(evh->evl_encap_proto);
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#if defined(INET) || defined(INET6)
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offset = sizeof(struct ether_header);
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#endif
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}
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switch (*etype) {
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#if defined(INET)
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case ETHERTYPE_IP: {
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struct ip *ip, iphdr;
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if (__predict_false(m->m_len < offset + sizeof(struct ip))) {
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m_copydata(m, offset, sizeof(struct ip),
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(caddr_t) &iphdr);
|
|
ip = &iphdr;
|
|
} else
|
|
ip = (struct ip *)(m->m_data + offset);
|
|
*proto = ip->ip_p;
|
|
*start = offset + (ip->ip_hl << 2);
|
|
break;
|
|
}
|
|
#endif
|
|
#if defined(INET6)
|
|
case ETHERTYPE_IPV6:
|
|
*proto = -1;
|
|
*start = ip6_lasthdr(m, offset, IPPROTO_IPV6, proto);
|
|
/* Assert the network stack sent us a valid packet. */
|
|
KASSERT(*start > offset,
|
|
("%s: mbuf %p start %d offset %d proto %d", __func__, m,
|
|
*start, offset, *proto));
|
|
break;
|
|
#endif
|
|
default:
|
|
/* Here we should increment the tx_csum_bad_ethtype counter. */
|
|
return (EINVAL);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static inline int
|
|
virtio_net_tx_offload_tso(if_t ifp, struct mbuf *m, int eth_type,
|
|
int offset, bool allow_ecn, struct virtio_net_hdr *hdr)
|
|
{
|
|
static struct timeval lastecn;
|
|
static int curecn;
|
|
struct tcphdr *tcp, tcphdr;
|
|
|
|
if (__predict_false(m->m_len < offset + sizeof(struct tcphdr))) {
|
|
m_copydata(m, offset, sizeof(struct tcphdr), (caddr_t) &tcphdr);
|
|
tcp = &tcphdr;
|
|
} else
|
|
tcp = (struct tcphdr *)(m->m_data + offset);
|
|
|
|
hdr->hdr_len = offset + (tcp->th_off << 2);
|
|
hdr->gso_size = m->m_pkthdr.tso_segsz;
|
|
hdr->gso_type = eth_type == ETHERTYPE_IP ? VIRTIO_NET_HDR_GSO_TCPV4 :
|
|
VIRTIO_NET_HDR_GSO_TCPV6;
|
|
|
|
if (tcp->th_flags & TH_CWR) {
|
|
/*
|
|
* Drop if VIRTIO_NET_F_HOST_ECN was not negotiated. In FreeBSD,
|
|
* ECN support is not on a per-interface basis, but globally via
|
|
* the net.inet.tcp.ecn.enable sysctl knob. The default is off.
|
|
*/
|
|
if (!allow_ecn) {
|
|
if (ppsratecheck(&lastecn, &curecn, 1))
|
|
if_printf(ifp,
|
|
"TSO with ECN not negotiated with host\n");
|
|
return (ENOTSUP);
|
|
}
|
|
hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN;
|
|
}
|
|
|
|
/* Here we should increment tx_tso counter. */
|
|
|
|
return (0);
|
|
}
|
|
|
|
static inline struct mbuf *
|
|
virtio_net_tx_offload(if_t ifp, struct mbuf *m, bool allow_ecn,
|
|
struct virtio_net_hdr *hdr)
|
|
{
|
|
int flags, etype, csum_start, proto, error;
|
|
|
|
flags = m->m_pkthdr.csum_flags;
|
|
|
|
error = virtio_net_tx_offload_ctx(m, &etype, &proto, &csum_start);
|
|
if (error)
|
|
goto drop;
|
|
|
|
if ((etype == ETHERTYPE_IP && (flags & (CSUM_TCP | CSUM_UDP))) ||
|
|
(etype == ETHERTYPE_IPV6 &&
|
|
(flags & (CSUM_TCP_IPV6 | CSUM_UDP_IPV6)))) {
|
|
/*
|
|
* We could compare the IP protocol vs the CSUM_ flag too,
|
|
* but that really should not be necessary.
|
|
*/
|
|
hdr->flags |= VIRTIO_NET_HDR_F_NEEDS_CSUM;
|
|
hdr->csum_start = csum_start;
|
|
hdr->csum_offset = m->m_pkthdr.csum_data;
|
|
/* Here we should increment the tx_csum counter. */
|
|
}
|
|
|
|
if (flags & CSUM_TSO) {
|
|
if (__predict_false(proto != IPPROTO_TCP)) {
|
|
/* Likely failed to correctly parse the mbuf.
|
|
* Here we should increment the tx_tso_not_tcp
|
|
* counter. */
|
|
goto drop;
|
|
}
|
|
|
|
KASSERT(hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM,
|
|
("%s: mbuf %p TSO without checksum offload %#x",
|
|
__func__, m, flags));
|
|
|
|
error = virtio_net_tx_offload_tso(ifp, m, etype, csum_start,
|
|
allow_ecn, hdr);
|
|
if (error)
|
|
goto drop;
|
|
}
|
|
|
|
return (m);
|
|
|
|
drop:
|
|
m_freem(m);
|
|
return (NULL);
|
|
}
|
|
|
|
#endif /* _VIRTIO_NET_H */
|