2bbb811998
This patch support mergeable RX feature and thus support jumbo frame RX and TX in user space vhost(as virtio backend). On RX, it secures enough room from vring to accommodate one complete scattered packet which is received by PMD from physical port, and then copy data from mbuf to vring buffer, possibly across a few vring entries and descriptors. On TX, it gets a jumbo frame, possibly described by a few vring descriptors which are chained together with the flags of 'NEXT', and then copy them into one scattered packet and TX it to physical port through PMD. Signed-off-by: Changchun Ouyang <changchun.ouyang@intel.com> Acked-by: Huawei Xie <huawei.xie@intel.com>
162 lines
6.2 KiB
C
162 lines
6.2 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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/* 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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/* Backend value set by guest. */
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#define VIRTIO_DEV_STOPPED -1
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#define PAGE_SIZE 4096
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/* Enum for virtqueue management. */
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enum {VIRTIO_RXQ, VIRTIO_TXQ, VIRTIO_QNUM};
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#define BUF_VECTOR_MAX 256
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/*
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* Structure contains buffer address, length and descriptor index
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* from vring to do scatter RX.
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*/
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struct buf_vector {
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uint64_t buf_addr;
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uint32_t buf_len;
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uint32_t desc_idx;
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};
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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 backend; /* Backend value to determine if device should started/stopped. */
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uint16_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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eventfd_t callfd; /* Currently unused as polling mode is enabled. */
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eventfd_t kickfd; /* Used to notify the guest (trigger interrupt). */
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/* Used for scatter RX. */
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struct buf_vector buf_vec[BUF_VECTOR_MAX];
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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[VIRTIO_QNUM]; /* Contains all 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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uint64_t features; /* Negotiated feature set. */
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uint64_t device_fh; /* device identifier. */
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uint32_t vmdq_rx_q; /* RX VMDQ queue number. */
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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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uint16_t coreid; /* Data core that the device is added to. */
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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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} __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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* Information relating to memory regions including offsets to
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* addresses in host physical space.
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*/
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struct virtio_memory_regions_hpa {
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/* Base guest physical address of region. */
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uint64_t guest_phys_address;
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/* End guest physical address of region. */
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uint64_t guest_phys_address_end;
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/* Size of region. */
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uint64_t memory_size;
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/* Offset of region for gpa to hpa translation. */
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uint64_t host_phys_addr_offset;
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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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uint64_t base_address; /* Base QEMU userspace address of the memory file. */
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uint64_t mapped_address; /* Mapped address of memory file base in our applications memory space. */
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uint64_t mapped_size; /* Total size of memory file. */
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uint32_t nregions; /* Number of memory regions. */
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/* Number of memory regions for gpa to hpa translation. */
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uint32_t nregions_hpa;
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/* Memory region information for gpa to hpa translation. */
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struct virtio_memory_regions_hpa *regions_hpa;
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/* Memory region information. */
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struct virtio_memory_regions regions[0];
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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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int init_virtio_net(struct virtio_net_device_ops const * const);
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int deinit_virtio_net(void);
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struct vhost_net_device_ops const * get_virtio_net_callbacks(void);
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#endif /* _VIRTIO_NET_H_ */
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