47bd46112b
This provides a para-virtualization packet switching solution, based on the Xen hypervisor’s Grant Table, which provides simple and fast packet switching capability between guest domains and host domain based on MAC address or VLAN tag. This solution is comprised of two components; a Poll Mode Driver (PMD) as the front end in the guest domain and a switching back end in the host domain. XenStore is used to exchange configure information between the PMD front end and switching back end, including grant reference IDs for shared Virtio RX/TX rings, MAC address, device state, and so on. The front end PMD can be found in the Intel DPDK directory lib/ librte_pmd_xenvirt and back end example in examples/vhost_xen. Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
116 lines
4.9 KiB
C
116 lines
4.9 KiB
C
/*-
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* BSD LICENSE
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*
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* Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
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* All rights reserved.
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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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*
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* * 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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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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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
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 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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#include <stdint.h>
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#define VQ_DESC_NUM 256
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/* Used to indicate that the device is running on a data core */
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#define VIRTIO_DEV_RUNNING 1
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/*
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* Structure contains variables relevant to TX/RX virtqueues.
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*/
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struct vhost_virtqueue
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{
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struct vring_desc *desc; /* Virtqueue descriptor ring. */
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struct vring_avail *avail; /* Virtqueue available ring. */
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struct vring_used *used; /* Virtqueue used ring. */
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uint32_t size; /* Size of descriptor ring. */
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uint32_t vhost_hlen; /* Vhost header length (varies depending on RX merge buffers. */
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volatile uint16_t last_used_idx; /* Last index used on the available ring */
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volatile uint16_t last_used_idx_res; /* Used for multiple devices reserving buffers. */
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} __rte_cache_aligned;
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/*
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* Device structure contains all configuration information relating to the device.
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*/
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struct virtio_net
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{
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struct vhost_virtqueue *virtqueue_tx; /* Contains all TX virtqueue information. */
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struct vhost_virtqueue *virtqueue_rx; /* Contains all RX virtqueue information. */
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struct virtio_memory *mem; /* QEMU memory and memory region information. */
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struct ether_addr mac_address; /* Device MAC address (Obtained on first TX packet). */
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uint32_t flags; /* Device flags. Only used to check if device is running on data core. */
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uint32_t vlan_tag; /* Vlan tag for device. Currently set to device_id (0-63). */
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uint32_t vmdq_rx_q;
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uint64_t device_fh; /* device identifier. */
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uint16_t coreid;
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volatile uint8_t ready; /* A device is set as ready if the MAC address has been set. */
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volatile uint8_t remove; /* Device is marked for removal from the data core. */
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uint32_t virtio_idx; /* Index of virtio device */
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uint32_t dom_id; /* Domain id of xen guest */
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} ___rte_cache_aligned;
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/*
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* Device linked list structure for configuration.
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*/
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struct virtio_net_config_ll
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{
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struct virtio_net dev; /* Virtio device. */
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struct virtio_net_config_ll *next; /* Next entry on linked list. */
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};
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/*
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* Information relating to memory regions including offsets to addresses in QEMUs memory file.
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*/
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struct virtio_memory_regions {
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uint64_t guest_phys_address; /* Base guest physical address of region. */
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uint64_t guest_phys_address_end; /* End guest physical address of region. */
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uint64_t memory_size; /* Size of region. */
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uint64_t userspace_address; /* Base userspace address of region. */
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uint64_t address_offset; /* Offset of region for address translation. */
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};
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/*
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* Memory structure includes region and mapping information.
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*/
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struct virtio_memory {
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uint32_t nregions; /* Number of memory regions. */
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struct virtio_memory_regions regions[0]; /* Memory region information. */
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};
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/*
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* Device operations to add/remove device.
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*/
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struct virtio_net_device_ops {
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int (* new_device)(struct virtio_net *); /* Add device. */
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void (* destroy_device) (volatile struct virtio_net *); /* Remove device. */
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};
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struct vhost_net_device_ops const * get_virtio_net_callbacks(void);
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#endif
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