9ba1e744ab
Dequeue zero copy is disabled by default. Here add a new flag ``RTE_VHOST_USER_DEQUEUE_ZERO_COPY`` to explictily enable it. Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com> Tested-by: Qian Xu <qian.q.xu@intel.com>
289 lines
8.1 KiB
C
289 lines
8.1 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 _VHOST_NET_CDEV_H_
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#define _VHOST_NET_CDEV_H_
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#include <stdint.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/queue.h>
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#include <unistd.h>
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#include <linux/vhost.h>
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#include <rte_log.h>
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#include "rte_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 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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* A structure to hold some fields needed in zero copy code path,
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* mainly for associating an mbuf with the right desc_idx.
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*/
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struct zcopy_mbuf {
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struct rte_mbuf *mbuf;
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uint32_t desc_idx;
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uint16_t in_use;
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TAILQ_ENTRY(zcopy_mbuf) next;
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};
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TAILQ_HEAD(zcopy_mbuf_list, zcopy_mbuf);
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/**
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* Structure contains variables relevant to RX/TX virtqueues.
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*/
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struct vhost_virtqueue {
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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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uint32_t size;
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uint16_t last_avail_idx;
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volatile uint16_t last_used_idx;
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#define VIRTIO_INVALID_EVENTFD (-1)
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#define VIRTIO_UNINITIALIZED_EVENTFD (-2)
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/* Backend value to determine if device should started/stopped */
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int backend;
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/* Used to notify the guest (trigger interrupt) */
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int callfd;
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/* Currently unused as polling mode is enabled */
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int kickfd;
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int enabled;
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/* Physical address of used ring, for logging */
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uint64_t log_guest_addr;
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uint16_t nr_zmbuf;
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uint16_t zmbuf_size;
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uint16_t last_zmbuf_idx;
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struct zcopy_mbuf *zmbufs;
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struct zcopy_mbuf_list zmbuf_list;
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} __rte_cache_aligned;
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/* Old kernels have no such macro defined */
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#ifndef VIRTIO_NET_F_GUEST_ANNOUNCE
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#define VIRTIO_NET_F_GUEST_ANNOUNCE 21
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#endif
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/*
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* Make an extra wrapper for VIRTIO_NET_F_MQ and
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* VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX as they are
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* introduced since kernel v3.8. This makes our
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* code buildable for older kernel.
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*/
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#ifdef VIRTIO_NET_F_MQ
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#define VHOST_MAX_QUEUE_PAIRS VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX
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#define VHOST_SUPPORTS_MQ (1ULL << VIRTIO_NET_F_MQ)
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#else
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#define VHOST_MAX_QUEUE_PAIRS 1
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#define VHOST_SUPPORTS_MQ 0
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#endif
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/*
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* Define virtio 1.0 for older kernels
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*/
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#ifndef VIRTIO_F_VERSION_1
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#define VIRTIO_F_VERSION_1 32
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#endif
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struct guest_page {
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uint64_t guest_phys_addr;
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uint64_t host_phys_addr;
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uint64_t size;
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};
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/**
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* Device structure contains all configuration information relating
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* to the device.
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*/
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struct virtio_net {
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/* Frontend (QEMU) memory and memory region information */
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struct virtio_memory *mem;
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uint64_t features;
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uint64_t protocol_features;
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int vid;
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uint32_t flags;
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uint16_t vhost_hlen;
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/* to tell if we need broadcast rarp packet */
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rte_atomic16_t broadcast_rarp;
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uint32_t virt_qp_nb;
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int dequeue_zero_copy;
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struct vhost_virtqueue *virtqueue[VHOST_MAX_QUEUE_PAIRS * 2];
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#define IF_NAME_SZ (PATH_MAX > IFNAMSIZ ? PATH_MAX : IFNAMSIZ)
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char ifname[IF_NAME_SZ];
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uint64_t log_size;
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uint64_t log_base;
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uint64_t log_addr;
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struct ether_addr mac;
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uint32_t nr_guest_pages;
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uint32_t max_guest_pages;
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struct guest_page *guest_pages;
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} __rte_cache_aligned;
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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 virtio_memory_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 virtio_memory {
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uint32_t nregions;
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struct virtio_memory_region regions[0];
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};
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/* Macros for printing using RTE_LOG */
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#define RTE_LOGTYPE_VHOST_CONFIG RTE_LOGTYPE_USER1
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#define RTE_LOGTYPE_VHOST_DATA RTE_LOGTYPE_USER1
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#ifdef RTE_LIBRTE_VHOST_DEBUG
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#define VHOST_MAX_PRINT_BUFF 6072
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#define LOG_LEVEL RTE_LOG_DEBUG
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#define LOG_DEBUG(log_type, fmt, args...) RTE_LOG(DEBUG, log_type, fmt, ##args)
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#define PRINT_PACKET(device, addr, size, header) do { \
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char *pkt_addr = (char *)(addr); \
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unsigned int index; \
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char packet[VHOST_MAX_PRINT_BUFF]; \
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\
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if ((header)) \
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snprintf(packet, VHOST_MAX_PRINT_BUFF, "(%d) Header size %d: ", (device->vid), (size)); \
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else \
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snprintf(packet, VHOST_MAX_PRINT_BUFF, "(%d) Packet size %d: ", (device->vid), (size)); \
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for (index = 0; index < (size); index++) { \
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snprintf(packet + strnlen(packet, VHOST_MAX_PRINT_BUFF), VHOST_MAX_PRINT_BUFF - strnlen(packet, VHOST_MAX_PRINT_BUFF), \
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"%02hhx ", pkt_addr[index]); \
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} \
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snprintf(packet + strnlen(packet, VHOST_MAX_PRINT_BUFF), VHOST_MAX_PRINT_BUFF - strnlen(packet, VHOST_MAX_PRINT_BUFF), "\n"); \
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\
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LOG_DEBUG(VHOST_DATA, "%s", packet); \
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} while (0)
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#else
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#define LOG_LEVEL RTE_LOG_INFO
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#define LOG_DEBUG(log_type, fmt, args...) do {} while (0)
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#define PRINT_PACKET(device, addr, size, header) do {} while (0)
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#endif
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extern uint64_t VHOST_FEATURES;
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#define MAX_VHOST_DEVICE 1024
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extern struct virtio_net *vhost_devices[MAX_VHOST_DEVICE];
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/* Convert guest physical Address to host virtual address */
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static inline uint64_t __attribute__((always_inline))
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gpa_to_vva(struct virtio_net *dev, uint64_t gpa)
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{
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struct virtio_memory_region *reg;
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uint32_t i;
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for (i = 0; i < dev->mem->nregions; i++) {
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reg = &dev->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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/* Convert guest physical address to host physical address */
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static inline phys_addr_t __attribute__((always_inline))
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gpa_to_hpa(struct virtio_net *dev, uint64_t gpa, uint64_t size)
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{
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uint32_t i;
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struct guest_page *page;
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for (i = 0; i < dev->nr_guest_pages; i++) {
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page = &dev->guest_pages[i];
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if (gpa >= page->guest_phys_addr &&
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gpa + size < page->guest_phys_addr + page->size) {
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return gpa - page->guest_phys_addr +
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page->host_phys_addr;
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}
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}
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return 0;
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}
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struct virtio_net_device_ops const *notify_ops;
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struct virtio_net *get_device(int vid);
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int vhost_new_device(void);
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void cleanup_device(struct virtio_net *dev, int destroy);
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void reset_device(struct virtio_net *dev);
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void vhost_destroy_device(int);
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int alloc_vring_queue_pair(struct virtio_net *dev, uint32_t qp_idx);
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void vhost_set_ifname(int, const char *if_name, unsigned int if_len);
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void vhost_enable_dequeue_zero_copy(int vid);
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/*
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* Backend-specific cleanup. Defined by vhost-cuse and vhost-user.
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*/
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void vhost_backend_cleanup(struct virtio_net *dev);
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#endif /* _VHOST_NET_CDEV_H_ */
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