abd53c16b6
Features could be changed after the feature negotiation. For example, VHOST_F_LOG_ALL will be set/cleared at the start/end of live migration, respecitively. Thus, we need a new callback to inform the application on such change. Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
374 lines
9.7 KiB
C
374 lines
9.7 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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/**
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* @file
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* Interface to vhost net
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*/
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#include <stdint.h>
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#include <linux/vhost.h>
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#include <linux/virtio_ring.h>
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#include <sys/eventfd.h>
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#include <rte_memory.h>
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#include <rte_mempool.h>
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#define RTE_VHOST_USER_CLIENT (1ULL << 0)
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#define RTE_VHOST_USER_NO_RECONNECT (1ULL << 1)
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#define RTE_VHOST_USER_DEQUEUE_ZERO_COPY (1ULL << 2)
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/**
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* Information relating to memory regions including offsets to
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* addresses in QEMUs memory file.
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*/
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struct rte_vhost_mem_region {
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uint64_t guest_phys_addr;
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uint64_t guest_user_addr;
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uint64_t host_user_addr;
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uint64_t size;
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void *mmap_addr;
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uint64_t mmap_size;
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int fd;
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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 rte_vhost_memory {
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uint32_t nregions;
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struct rte_vhost_mem_region regions[0];
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};
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struct rte_vhost_vring {
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struct vring_desc *desc;
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struct vring_avail *avail;
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struct vring_used *used;
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uint64_t log_guest_addr;
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int callfd;
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int kickfd;
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uint16_t size;
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};
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/**
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* Device and vring operations.
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*/
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struct vhost_device_ops {
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int (*new_device)(int vid); /**< Add device. */
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void (*destroy_device)(int vid); /**< Remove device. */
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int (*vring_state_changed)(int vid, uint16_t queue_id, int enable); /**< triggered when a vring is enabled or disabled */
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/**
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* Features could be changed after the feature negotiation.
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* For example, VHOST_F_LOG_ALL will be set/cleared at the
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* start/end of live migration, respectively. This callback
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* is used to inform the application on such change.
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*/
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int (*features_changed)(int vid, uint64_t features);
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void *reserved[4]; /**< Reserved for future extension */
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};
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/**
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* Convert guest physical address to host virtual address
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*
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* @param mem
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* the guest memory regions
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* @param gpa
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* the guest physical address for querying
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* @return
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* the host virtual address on success, 0 on failure
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*/
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static inline uint64_t __attribute__((always_inline))
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rte_vhost_gpa_to_vva(struct rte_vhost_memory *mem, uint64_t gpa)
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{
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struct rte_vhost_mem_region *reg;
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uint32_t i;
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for (i = 0; i < mem->nregions; i++) {
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reg = &mem->regions[i];
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if (gpa >= reg->guest_phys_addr &&
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gpa < reg->guest_phys_addr + reg->size) {
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return gpa - reg->guest_phys_addr +
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reg->host_user_addr;
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}
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}
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return 0;
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}
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int rte_vhost_enable_guest_notification(int vid, uint16_t queue_id, int enable);
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/**
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* Register vhost driver. path could be different for multiple
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* instance support.
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*/
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int rte_vhost_driver_register(const char *path, uint64_t flags);
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/* Unregister vhost driver. This is only meaningful to vhost user. */
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int rte_vhost_driver_unregister(const char *path);
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/**
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* Set the feature bits the vhost-user driver supports.
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*
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* @param path
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* The vhost-user socket file path
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* @param features
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* Supported features
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* @return
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* 0 on success, -1 on failure
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*/
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int rte_vhost_driver_set_features(const char *path, uint64_t features);
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/**
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* Enable vhost-user driver features.
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*
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* Note that
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* - the param features should be a subset of the feature bits provided
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* by rte_vhost_driver_set_features().
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* - it must be invoked before vhost-user negotiation starts.
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*
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* @param path
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* The vhost-user socket file path
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* @param features
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* Features to enable
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* @return
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* 0 on success, -1 on failure
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*/
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int rte_vhost_driver_enable_features(const char *path, uint64_t features);
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/**
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* Disable vhost-user driver features.
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*
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* The two notes at rte_vhost_driver_enable_features() also apply here.
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*
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* @param path
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* The vhost-user socket file path
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* @param features
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* Features to disable
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* @return
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* 0 on success, -1 on failure
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*/
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int rte_vhost_driver_disable_features(const char *path, uint64_t features);
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/**
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* Get the feature bits before feature negotiation.
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*
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* @param path
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* The vhost-user socket file path
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* @param features
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* A pointer to store the queried feature bits
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* @return
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* 0 on success, -1 on failure
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*/
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int rte_vhost_driver_get_features(const char *path, uint64_t *features);
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/**
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* Get the feature bits after negotiation
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*
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* @param vid
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* Vhost device ID
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* @param features
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* A pointer to store the queried feature bits
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* @return
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* 0 on success, -1 on failure
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*/
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int rte_vhost_get_negotiated_features(int vid, uint64_t *features);
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/* Register callbacks. */
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int rte_vhost_driver_callback_register(const char *path,
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struct vhost_device_ops const * const ops);
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/* Start vhost driver session blocking loop. */
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int rte_vhost_driver_session_start(void);
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/**
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* Get the MTU value of the device if set in QEMU.
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*
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* @param vid
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* virtio-net device ID
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* @param mtu
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* The variable to store the MTU value
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*
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* @return
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* 0: success
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* -EAGAIN: device not yet started
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* -ENOTSUP: device does not support MTU feature
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*/
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int rte_vhost_get_mtu(int vid, uint16_t *mtu);
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/**
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* Get the numa node from which the virtio net device's memory
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* is allocated.
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*
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* @param vid
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* vhost device ID
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*
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* @return
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* The numa node, -1 on failure
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*/
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int rte_vhost_get_numa_node(int vid);
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/**
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* @deprecated
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* Get the number of queues the device supports.
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*
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* Note this function is deprecated, as it returns a queue pair number,
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* which is vhost specific. Instead, rte_vhost_get_vring_num should
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* be used.
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*
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* @param vid
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* vhost device ID
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*
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* @return
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* The number of queues, 0 on failure
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*/
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__rte_deprecated
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uint32_t rte_vhost_get_queue_num(int vid);
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/**
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* Get the number of vrings the device supports.
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*
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* @param vid
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* vhost device ID
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*
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* @return
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* The number of vrings, 0 on failure
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*/
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uint16_t rte_vhost_get_vring_num(int vid);
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/**
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* Get the virtio net device's ifname, which is the vhost-user socket
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* file path.
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*
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* @param vid
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* vhost device ID
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* @param buf
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* The buffer to stored the queried ifname
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* @param len
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* The length of buf
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*
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* @return
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* 0 on success, -1 on failure
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*/
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int rte_vhost_get_ifname(int vid, char *buf, size_t len);
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/**
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* Get how many avail entries are left in the queue
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*
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* @param vid
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* vhost device ID
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* @param queue_id
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* virtio queue index
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*
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* @return
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* num of avail entires left
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*/
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uint16_t rte_vhost_avail_entries(int vid, uint16_t queue_id);
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/**
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* This function adds buffers to the virtio devices RX virtqueue. Buffers can
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* be received from the physical port or from another virtual device. A packet
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* count is returned to indicate the number of packets that were succesfully
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* added to the RX queue.
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* @param vid
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* vhost device ID
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* @param queue_id
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* virtio queue index in mq case
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* @param pkts
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* array to contain packets to be enqueued
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* @param count
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* packets num to be enqueued
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* @return
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* num of packets enqueued
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*/
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uint16_t rte_vhost_enqueue_burst(int vid, uint16_t queue_id,
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struct rte_mbuf **pkts, uint16_t count);
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/**
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* This function gets guest buffers from the virtio device TX virtqueue,
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* construct host mbufs, copies guest buffer content to host mbufs and
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* store them in pkts to be processed.
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* @param vid
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* vhost device ID
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* @param queue_id
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* virtio queue index in mq case
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* @param mbuf_pool
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* mbuf_pool where host mbuf is allocated.
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* @param pkts
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* array to contain packets to be dequeued
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* @param count
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* packets num to be dequeued
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* @return
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* num of packets dequeued
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*/
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uint16_t rte_vhost_dequeue_burst(int vid, uint16_t queue_id,
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struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t count);
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/**
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* Get guest mem table: a list of memory regions.
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*
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* An rte_vhost_vhost_memory object will be allocated internaly, to hold the
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* guest memory regions. Application should free it at destroy_device()
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* callback.
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*
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* @param vid
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* vhost device ID
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* @param mem
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* To store the returned mem regions
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* @return
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* 0 on success, -1 on failure
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*/
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int rte_vhost_get_mem_table(int vid, struct rte_vhost_memory **mem);
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/**
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* Get guest vring info, including the vring address, vring size, etc.
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*
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* @param vid
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* vhost device ID
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* @param vring_idx
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* vring index
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* @param vring
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* the structure to hold the requested vring info
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* @return
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* 0 on success, -1 on failure
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*/
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int rte_vhost_get_vhost_vring(int vid, uint16_t vring_idx,
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struct rte_vhost_vring *vring);
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#endif /* _VIRTIO_NET_H_ */
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