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![Eugenio Pérez](/assets/img/avatar_default.png)
Finally enable SVQ with MQ feature. Signed-off-by: Eugenio Pérez <eperezma@redhat.com> Signed-off-by: Jason Wang <jasowang@redhat.com>
761 lines
22 KiB
C
761 lines
22 KiB
C
/*
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* vhost-vdpa.c
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*
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* Copyright(c) 2017-2018 Intel Corporation.
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* Copyright(c) 2020 Red Hat, Inc.
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#include "qemu/osdep.h"
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#include "clients.h"
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#include "hw/virtio/virtio-net.h"
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#include "net/vhost_net.h"
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#include "net/vhost-vdpa.h"
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#include "hw/virtio/vhost-vdpa.h"
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#include "qemu/config-file.h"
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#include "qemu/error-report.h"
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#include "qemu/log.h"
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#include "qemu/memalign.h"
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#include "qemu/option.h"
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#include "qapi/error.h"
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#include <linux/vhost.h>
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#include <sys/ioctl.h>
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#include <err.h>
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#include "standard-headers/linux/virtio_net.h"
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#include "monitor/monitor.h"
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#include "hw/virtio/vhost.h"
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/* Todo:need to add the multiqueue support here */
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typedef struct VhostVDPAState {
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NetClientState nc;
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struct vhost_vdpa vhost_vdpa;
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VHostNetState *vhost_net;
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/* Control commands shadow buffers */
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void *cvq_cmd_out_buffer;
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virtio_net_ctrl_ack *status;
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bool started;
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} VhostVDPAState;
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const int vdpa_feature_bits[] = {
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VIRTIO_F_NOTIFY_ON_EMPTY,
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VIRTIO_RING_F_INDIRECT_DESC,
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VIRTIO_RING_F_EVENT_IDX,
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VIRTIO_F_ANY_LAYOUT,
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VIRTIO_F_VERSION_1,
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VIRTIO_NET_F_CSUM,
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VIRTIO_NET_F_GUEST_CSUM,
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VIRTIO_NET_F_GSO,
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VIRTIO_NET_F_GUEST_TSO4,
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VIRTIO_NET_F_GUEST_TSO6,
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VIRTIO_NET_F_GUEST_ECN,
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VIRTIO_NET_F_GUEST_UFO,
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VIRTIO_NET_F_HOST_TSO4,
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VIRTIO_NET_F_HOST_TSO6,
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VIRTIO_NET_F_HOST_ECN,
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VIRTIO_NET_F_HOST_UFO,
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VIRTIO_NET_F_MRG_RXBUF,
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VIRTIO_NET_F_MTU,
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VIRTIO_NET_F_CTRL_RX,
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VIRTIO_NET_F_CTRL_RX_EXTRA,
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VIRTIO_NET_F_CTRL_VLAN,
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VIRTIO_NET_F_GUEST_ANNOUNCE,
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VIRTIO_NET_F_CTRL_MAC_ADDR,
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VIRTIO_NET_F_RSS,
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VIRTIO_NET_F_MQ,
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VIRTIO_NET_F_CTRL_VQ,
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VIRTIO_F_IOMMU_PLATFORM,
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VIRTIO_F_RING_PACKED,
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VIRTIO_NET_F_RSS,
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VIRTIO_NET_F_HASH_REPORT,
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VIRTIO_NET_F_GUEST_ANNOUNCE,
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VIRTIO_NET_F_STATUS,
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VHOST_INVALID_FEATURE_BIT
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};
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/** Supported device specific feature bits with SVQ */
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static const uint64_t vdpa_svq_device_features =
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BIT_ULL(VIRTIO_NET_F_CSUM) |
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BIT_ULL(VIRTIO_NET_F_GUEST_CSUM) |
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BIT_ULL(VIRTIO_NET_F_MTU) |
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BIT_ULL(VIRTIO_NET_F_MAC) |
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BIT_ULL(VIRTIO_NET_F_GUEST_TSO4) |
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BIT_ULL(VIRTIO_NET_F_GUEST_TSO6) |
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BIT_ULL(VIRTIO_NET_F_GUEST_ECN) |
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BIT_ULL(VIRTIO_NET_F_GUEST_UFO) |
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BIT_ULL(VIRTIO_NET_F_HOST_TSO4) |
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BIT_ULL(VIRTIO_NET_F_HOST_TSO6) |
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BIT_ULL(VIRTIO_NET_F_HOST_ECN) |
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BIT_ULL(VIRTIO_NET_F_HOST_UFO) |
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BIT_ULL(VIRTIO_NET_F_MRG_RXBUF) |
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BIT_ULL(VIRTIO_NET_F_STATUS) |
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BIT_ULL(VIRTIO_NET_F_CTRL_VQ) |
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BIT_ULL(VIRTIO_NET_F_MQ) |
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BIT_ULL(VIRTIO_F_ANY_LAYOUT) |
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BIT_ULL(VIRTIO_NET_F_CTRL_MAC_ADDR) |
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BIT_ULL(VIRTIO_NET_F_RSC_EXT) |
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BIT_ULL(VIRTIO_NET_F_STANDBY);
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VHostNetState *vhost_vdpa_get_vhost_net(NetClientState *nc)
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{
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VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
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assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
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return s->vhost_net;
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}
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static int vhost_vdpa_net_check_device_id(struct vhost_net *net)
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{
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uint32_t device_id;
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int ret;
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struct vhost_dev *hdev;
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hdev = (struct vhost_dev *)&net->dev;
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ret = hdev->vhost_ops->vhost_get_device_id(hdev, &device_id);
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if (device_id != VIRTIO_ID_NET) {
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return -ENOTSUP;
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}
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return ret;
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}
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static int vhost_vdpa_add(NetClientState *ncs, void *be,
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int queue_pair_index, int nvqs)
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{
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VhostNetOptions options;
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struct vhost_net *net = NULL;
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VhostVDPAState *s;
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int ret;
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options.backend_type = VHOST_BACKEND_TYPE_VDPA;
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assert(ncs->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
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s = DO_UPCAST(VhostVDPAState, nc, ncs);
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options.net_backend = ncs;
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options.opaque = be;
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options.busyloop_timeout = 0;
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options.nvqs = nvqs;
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net = vhost_net_init(&options);
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if (!net) {
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error_report("failed to init vhost_net for queue");
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goto err_init;
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}
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s->vhost_net = net;
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ret = vhost_vdpa_net_check_device_id(net);
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if (ret) {
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goto err_check;
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}
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return 0;
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err_check:
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vhost_net_cleanup(net);
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g_free(net);
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err_init:
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return -1;
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}
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static void vhost_vdpa_cleanup(NetClientState *nc)
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{
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VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
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struct vhost_dev *dev = &s->vhost_net->dev;
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qemu_vfree(s->cvq_cmd_out_buffer);
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qemu_vfree(s->status);
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if (dev->vq_index + dev->nvqs == dev->vq_index_end) {
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g_clear_pointer(&s->vhost_vdpa.iova_tree, vhost_iova_tree_delete);
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}
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if (s->vhost_net) {
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vhost_net_cleanup(s->vhost_net);
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g_free(s->vhost_net);
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s->vhost_net = NULL;
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}
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if (s->vhost_vdpa.device_fd >= 0) {
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qemu_close(s->vhost_vdpa.device_fd);
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s->vhost_vdpa.device_fd = -1;
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}
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}
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static bool vhost_vdpa_has_vnet_hdr(NetClientState *nc)
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{
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assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
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return true;
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}
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static bool vhost_vdpa_has_ufo(NetClientState *nc)
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{
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assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
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VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
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uint64_t features = 0;
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features |= (1ULL << VIRTIO_NET_F_HOST_UFO);
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features = vhost_net_get_features(s->vhost_net, features);
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return !!(features & (1ULL << VIRTIO_NET_F_HOST_UFO));
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}
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static bool vhost_vdpa_check_peer_type(NetClientState *nc, ObjectClass *oc,
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Error **errp)
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{
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const char *driver = object_class_get_name(oc);
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if (!g_str_has_prefix(driver, "virtio-net-")) {
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error_setg(errp, "vhost-vdpa requires frontend driver virtio-net-*");
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return false;
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}
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return true;
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}
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/** Dummy receive in case qemu falls back to userland tap networking */
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static ssize_t vhost_vdpa_receive(NetClientState *nc, const uint8_t *buf,
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size_t size)
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{
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return 0;
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}
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static NetClientInfo net_vhost_vdpa_info = {
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.type = NET_CLIENT_DRIVER_VHOST_VDPA,
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.size = sizeof(VhostVDPAState),
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.receive = vhost_vdpa_receive,
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.cleanup = vhost_vdpa_cleanup,
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.has_vnet_hdr = vhost_vdpa_has_vnet_hdr,
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.has_ufo = vhost_vdpa_has_ufo,
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.check_peer_type = vhost_vdpa_check_peer_type,
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};
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static void vhost_vdpa_cvq_unmap_buf(struct vhost_vdpa *v, void *addr)
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{
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VhostIOVATree *tree = v->iova_tree;
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DMAMap needle = {
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/*
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* No need to specify size or to look for more translations since
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* this contiguous chunk was allocated by us.
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*/
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.translated_addr = (hwaddr)(uintptr_t)addr,
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};
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const DMAMap *map = vhost_iova_tree_find_iova(tree, &needle);
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int r;
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if (unlikely(!map)) {
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error_report("Cannot locate expected map");
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return;
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}
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r = vhost_vdpa_dma_unmap(v, map->iova, map->size + 1);
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if (unlikely(r != 0)) {
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error_report("Device cannot unmap: %s(%d)", g_strerror(r), r);
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}
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vhost_iova_tree_remove(tree, *map);
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}
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static size_t vhost_vdpa_net_cvq_cmd_len(void)
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{
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/*
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* MAC_TABLE_SET is the ctrl command that produces the longer out buffer.
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* In buffer is always 1 byte, so it should fit here
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*/
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return sizeof(struct virtio_net_ctrl_hdr) +
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2 * sizeof(struct virtio_net_ctrl_mac) +
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MAC_TABLE_ENTRIES * ETH_ALEN;
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}
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static size_t vhost_vdpa_net_cvq_cmd_page_len(void)
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{
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return ROUND_UP(vhost_vdpa_net_cvq_cmd_len(), qemu_real_host_page_size());
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}
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/** Map CVQ buffer. */
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static int vhost_vdpa_cvq_map_buf(struct vhost_vdpa *v, void *buf, size_t size,
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bool write)
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{
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DMAMap map = {};
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int r;
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map.translated_addr = (hwaddr)(uintptr_t)buf;
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map.size = size - 1;
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map.perm = write ? IOMMU_RW : IOMMU_RO,
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r = vhost_iova_tree_map_alloc(v->iova_tree, &map);
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if (unlikely(r != IOVA_OK)) {
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error_report("Cannot map injected element");
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return r;
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}
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r = vhost_vdpa_dma_map(v, map.iova, vhost_vdpa_net_cvq_cmd_page_len(), buf,
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!write);
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if (unlikely(r < 0)) {
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goto dma_map_err;
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}
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return 0;
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dma_map_err:
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vhost_iova_tree_remove(v->iova_tree, map);
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return r;
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}
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static int vhost_vdpa_net_cvq_start(NetClientState *nc)
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{
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VhostVDPAState *s;
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int r;
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assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
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s = DO_UPCAST(VhostVDPAState, nc, nc);
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if (!s->vhost_vdpa.shadow_vqs_enabled) {
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return 0;
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}
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r = vhost_vdpa_cvq_map_buf(&s->vhost_vdpa, s->cvq_cmd_out_buffer,
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vhost_vdpa_net_cvq_cmd_page_len(), false);
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if (unlikely(r < 0)) {
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return r;
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}
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r = vhost_vdpa_cvq_map_buf(&s->vhost_vdpa, s->status,
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vhost_vdpa_net_cvq_cmd_page_len(), true);
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if (unlikely(r < 0)) {
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vhost_vdpa_cvq_unmap_buf(&s->vhost_vdpa, s->cvq_cmd_out_buffer);
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}
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return r;
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}
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static void vhost_vdpa_net_cvq_stop(NetClientState *nc)
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{
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VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
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assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
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if (s->vhost_vdpa.shadow_vqs_enabled) {
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vhost_vdpa_cvq_unmap_buf(&s->vhost_vdpa, s->cvq_cmd_out_buffer);
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vhost_vdpa_cvq_unmap_buf(&s->vhost_vdpa, s->status);
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}
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}
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static ssize_t vhost_vdpa_net_cvq_add(VhostVDPAState *s, size_t out_len,
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size_t in_len)
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{
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/* Buffers for the device */
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const struct iovec out = {
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.iov_base = s->cvq_cmd_out_buffer,
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.iov_len = out_len,
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};
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const struct iovec in = {
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.iov_base = s->status,
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.iov_len = sizeof(virtio_net_ctrl_ack),
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};
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VhostShadowVirtqueue *svq = g_ptr_array_index(s->vhost_vdpa.shadow_vqs, 0);
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int r;
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r = vhost_svq_add(svq, &out, 1, &in, 1, NULL);
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if (unlikely(r != 0)) {
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if (unlikely(r == -ENOSPC)) {
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qemu_log_mask(LOG_GUEST_ERROR, "%s: No space on device queue\n",
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__func__);
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}
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return r;
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}
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/*
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* We can poll here since we've had BQL from the time we sent the
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* descriptor. Also, we need to take the answer before SVQ pulls by itself,
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* when BQL is released
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*/
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return vhost_svq_poll(svq);
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}
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static ssize_t vhost_vdpa_net_load_cmd(VhostVDPAState *s, uint8_t class,
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uint8_t cmd, const void *data,
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size_t data_size)
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{
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const struct virtio_net_ctrl_hdr ctrl = {
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.class = class,
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.cmd = cmd,
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};
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assert(data_size < vhost_vdpa_net_cvq_cmd_page_len() - sizeof(ctrl));
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memcpy(s->cvq_cmd_out_buffer, &ctrl, sizeof(ctrl));
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memcpy(s->cvq_cmd_out_buffer + sizeof(ctrl), data, data_size);
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return vhost_vdpa_net_cvq_add(s, sizeof(ctrl) + data_size,
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sizeof(virtio_net_ctrl_ack));
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}
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static int vhost_vdpa_net_load_mac(VhostVDPAState *s, const VirtIONet *n)
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{
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uint64_t features = n->parent_obj.guest_features;
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if (features & BIT_ULL(VIRTIO_NET_F_CTRL_MAC_ADDR)) {
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ssize_t dev_written = vhost_vdpa_net_load_cmd(s, VIRTIO_NET_CTRL_MAC,
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VIRTIO_NET_CTRL_MAC_ADDR_SET,
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n->mac, sizeof(n->mac));
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if (unlikely(dev_written < 0)) {
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return dev_written;
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}
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return *s->status != VIRTIO_NET_OK;
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}
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return 0;
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}
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static int vhost_vdpa_net_load_mq(VhostVDPAState *s,
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const VirtIONet *n)
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{
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struct virtio_net_ctrl_mq mq;
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uint64_t features = n->parent_obj.guest_features;
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ssize_t dev_written;
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if (!(features & BIT_ULL(VIRTIO_NET_F_MQ))) {
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return 0;
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}
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mq.virtqueue_pairs = cpu_to_le16(n->curr_queue_pairs);
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dev_written = vhost_vdpa_net_load_cmd(s, VIRTIO_NET_CTRL_MQ,
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VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &mq,
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sizeof(mq));
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if (unlikely(dev_written < 0)) {
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return dev_written;
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}
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return *s->status != VIRTIO_NET_OK;
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}
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static int vhost_vdpa_net_load(NetClientState *nc)
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{
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VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
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struct vhost_vdpa *v = &s->vhost_vdpa;
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const VirtIONet *n;
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int r;
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assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
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if (!v->shadow_vqs_enabled) {
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return 0;
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}
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n = VIRTIO_NET(v->dev->vdev);
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r = vhost_vdpa_net_load_mac(s, n);
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if (unlikely(r < 0)) {
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return r;
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}
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r = vhost_vdpa_net_load_mq(s, n);
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if (unlikely(r)) {
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return r;
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}
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return 0;
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}
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static NetClientInfo net_vhost_vdpa_cvq_info = {
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.type = NET_CLIENT_DRIVER_VHOST_VDPA,
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.size = sizeof(VhostVDPAState),
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.receive = vhost_vdpa_receive,
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.start = vhost_vdpa_net_cvq_start,
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.load = vhost_vdpa_net_load,
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.stop = vhost_vdpa_net_cvq_stop,
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.cleanup = vhost_vdpa_cleanup,
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.has_vnet_hdr = vhost_vdpa_has_vnet_hdr,
|
|
.has_ufo = vhost_vdpa_has_ufo,
|
|
.check_peer_type = vhost_vdpa_check_peer_type,
|
|
};
|
|
|
|
/**
|
|
* Do not forward commands not supported by SVQ. Otherwise, the device could
|
|
* accept it and qemu would not know how to update the device model.
|
|
*/
|
|
static bool vhost_vdpa_net_cvq_validate_cmd(const void *out_buf, size_t len)
|
|
{
|
|
struct virtio_net_ctrl_hdr ctrl;
|
|
|
|
if (unlikely(len < sizeof(ctrl))) {
|
|
qemu_log_mask(LOG_GUEST_ERROR,
|
|
"%s: invalid legnth of out buffer %zu\n", __func__, len);
|
|
return false;
|
|
}
|
|
|
|
memcpy(&ctrl, out_buf, sizeof(ctrl));
|
|
switch (ctrl.class) {
|
|
case VIRTIO_NET_CTRL_MAC:
|
|
switch (ctrl.cmd) {
|
|
case VIRTIO_NET_CTRL_MAC_ADDR_SET:
|
|
return true;
|
|
default:
|
|
qemu_log_mask(LOG_GUEST_ERROR, "%s: invalid mac cmd %u\n",
|
|
__func__, ctrl.cmd);
|
|
};
|
|
break;
|
|
case VIRTIO_NET_CTRL_MQ:
|
|
switch (ctrl.cmd) {
|
|
case VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET:
|
|
return true;
|
|
default:
|
|
qemu_log_mask(LOG_GUEST_ERROR, "%s: invalid mq cmd %u\n",
|
|
__func__, ctrl.cmd);
|
|
};
|
|
break;
|
|
default:
|
|
qemu_log_mask(LOG_GUEST_ERROR, "%s: invalid control class %u\n",
|
|
__func__, ctrl.class);
|
|
};
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Validate and copy control virtqueue commands.
|
|
*
|
|
* Following QEMU guidelines, we offer a copy of the buffers to the device to
|
|
* prevent TOCTOU bugs.
|
|
*/
|
|
static int vhost_vdpa_net_handle_ctrl_avail(VhostShadowVirtqueue *svq,
|
|
VirtQueueElement *elem,
|
|
void *opaque)
|
|
{
|
|
VhostVDPAState *s = opaque;
|
|
size_t in_len;
|
|
virtio_net_ctrl_ack status = VIRTIO_NET_ERR;
|
|
/* Out buffer sent to both the vdpa device and the device model */
|
|
struct iovec out = {
|
|
.iov_base = s->cvq_cmd_out_buffer,
|
|
};
|
|
/* in buffer used for device model */
|
|
const struct iovec in = {
|
|
.iov_base = &status,
|
|
.iov_len = sizeof(status),
|
|
};
|
|
ssize_t dev_written = -EINVAL;
|
|
bool ok;
|
|
|
|
out.iov_len = iov_to_buf(elem->out_sg, elem->out_num, 0,
|
|
s->cvq_cmd_out_buffer,
|
|
vhost_vdpa_net_cvq_cmd_len());
|
|
ok = vhost_vdpa_net_cvq_validate_cmd(s->cvq_cmd_out_buffer, out.iov_len);
|
|
if (unlikely(!ok)) {
|
|
goto out;
|
|
}
|
|
|
|
dev_written = vhost_vdpa_net_cvq_add(s, out.iov_len, sizeof(status));
|
|
if (unlikely(dev_written < 0)) {
|
|
goto out;
|
|
}
|
|
|
|
if (unlikely(dev_written < sizeof(status))) {
|
|
error_report("Insufficient written data (%zu)", dev_written);
|
|
goto out;
|
|
}
|
|
|
|
if (*s->status != VIRTIO_NET_OK) {
|
|
return VIRTIO_NET_ERR;
|
|
}
|
|
|
|
status = VIRTIO_NET_ERR;
|
|
virtio_net_handle_ctrl_iov(svq->vdev, &in, 1, &out, 1);
|
|
if (status != VIRTIO_NET_OK) {
|
|
error_report("Bad CVQ processing in model");
|
|
}
|
|
|
|
out:
|
|
in_len = iov_from_buf(elem->in_sg, elem->in_num, 0, &status,
|
|
sizeof(status));
|
|
if (unlikely(in_len < sizeof(status))) {
|
|
error_report("Bad device CVQ written length");
|
|
}
|
|
vhost_svq_push_elem(svq, elem, MIN(in_len, sizeof(status)));
|
|
g_free(elem);
|
|
return dev_written < 0 ? dev_written : 0;
|
|
}
|
|
|
|
static const VhostShadowVirtqueueOps vhost_vdpa_net_svq_ops = {
|
|
.avail_handler = vhost_vdpa_net_handle_ctrl_avail,
|
|
};
|
|
|
|
static NetClientState *net_vhost_vdpa_init(NetClientState *peer,
|
|
const char *device,
|
|
const char *name,
|
|
int vdpa_device_fd,
|
|
int queue_pair_index,
|
|
int nvqs,
|
|
bool is_datapath,
|
|
bool svq,
|
|
VhostIOVATree *iova_tree)
|
|
{
|
|
NetClientState *nc = NULL;
|
|
VhostVDPAState *s;
|
|
int ret = 0;
|
|
assert(name);
|
|
if (is_datapath) {
|
|
nc = qemu_new_net_client(&net_vhost_vdpa_info, peer, device,
|
|
name);
|
|
} else {
|
|
nc = qemu_new_net_control_client(&net_vhost_vdpa_cvq_info, peer,
|
|
device, name);
|
|
}
|
|
snprintf(nc->info_str, sizeof(nc->info_str), TYPE_VHOST_VDPA);
|
|
s = DO_UPCAST(VhostVDPAState, nc, nc);
|
|
|
|
s->vhost_vdpa.device_fd = vdpa_device_fd;
|
|
s->vhost_vdpa.index = queue_pair_index;
|
|
s->vhost_vdpa.shadow_vqs_enabled = svq;
|
|
s->vhost_vdpa.iova_tree = iova_tree;
|
|
if (!is_datapath) {
|
|
s->cvq_cmd_out_buffer = qemu_memalign(qemu_real_host_page_size(),
|
|
vhost_vdpa_net_cvq_cmd_page_len());
|
|
memset(s->cvq_cmd_out_buffer, 0, vhost_vdpa_net_cvq_cmd_page_len());
|
|
s->status = qemu_memalign(qemu_real_host_page_size(),
|
|
vhost_vdpa_net_cvq_cmd_page_len());
|
|
memset(s->status, 0, vhost_vdpa_net_cvq_cmd_page_len());
|
|
|
|
s->vhost_vdpa.shadow_vq_ops = &vhost_vdpa_net_svq_ops;
|
|
s->vhost_vdpa.shadow_vq_ops_opaque = s;
|
|
}
|
|
ret = vhost_vdpa_add(nc, (void *)&s->vhost_vdpa, queue_pair_index, nvqs);
|
|
if (ret) {
|
|
qemu_del_net_client(nc);
|
|
return NULL;
|
|
}
|
|
return nc;
|
|
}
|
|
|
|
static int vhost_vdpa_get_iova_range(int fd,
|
|
struct vhost_vdpa_iova_range *iova_range)
|
|
{
|
|
int ret = ioctl(fd, VHOST_VDPA_GET_IOVA_RANGE, iova_range);
|
|
|
|
return ret < 0 ? -errno : 0;
|
|
}
|
|
|
|
static int vhost_vdpa_get_features(int fd, uint64_t *features, Error **errp)
|
|
{
|
|
int ret = ioctl(fd, VHOST_GET_FEATURES, features);
|
|
if (unlikely(ret < 0)) {
|
|
error_setg_errno(errp, errno,
|
|
"Fail to query features from vhost-vDPA device");
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int vhost_vdpa_get_max_queue_pairs(int fd, uint64_t features,
|
|
int *has_cvq, Error **errp)
|
|
{
|
|
unsigned long config_size = offsetof(struct vhost_vdpa_config, buf);
|
|
g_autofree struct vhost_vdpa_config *config = NULL;
|
|
__virtio16 *max_queue_pairs;
|
|
int ret;
|
|
|
|
if (features & (1 << VIRTIO_NET_F_CTRL_VQ)) {
|
|
*has_cvq = 1;
|
|
} else {
|
|
*has_cvq = 0;
|
|
}
|
|
|
|
if (features & (1 << VIRTIO_NET_F_MQ)) {
|
|
config = g_malloc0(config_size + sizeof(*max_queue_pairs));
|
|
config->off = offsetof(struct virtio_net_config, max_virtqueue_pairs);
|
|
config->len = sizeof(*max_queue_pairs);
|
|
|
|
ret = ioctl(fd, VHOST_VDPA_GET_CONFIG, config);
|
|
if (ret) {
|
|
error_setg(errp, "Fail to get config from vhost-vDPA device");
|
|
return -ret;
|
|
}
|
|
|
|
max_queue_pairs = (__virtio16 *)&config->buf;
|
|
|
|
return lduw_le_p(max_queue_pairs);
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
int net_init_vhost_vdpa(const Netdev *netdev, const char *name,
|
|
NetClientState *peer, Error **errp)
|
|
{
|
|
const NetdevVhostVDPAOptions *opts;
|
|
uint64_t features;
|
|
int vdpa_device_fd;
|
|
g_autofree NetClientState **ncs = NULL;
|
|
g_autoptr(VhostIOVATree) iova_tree = NULL;
|
|
NetClientState *nc;
|
|
int queue_pairs, r, i = 0, has_cvq = 0;
|
|
|
|
assert(netdev->type == NET_CLIENT_DRIVER_VHOST_VDPA);
|
|
opts = &netdev->u.vhost_vdpa;
|
|
if (!opts->vhostdev) {
|
|
error_setg(errp, "vdpa character device not specified with vhostdev");
|
|
return -1;
|
|
}
|
|
|
|
vdpa_device_fd = qemu_open(opts->vhostdev, O_RDWR, errp);
|
|
if (vdpa_device_fd == -1) {
|
|
return -errno;
|
|
}
|
|
|
|
r = vhost_vdpa_get_features(vdpa_device_fd, &features, errp);
|
|
if (unlikely(r < 0)) {
|
|
goto err;
|
|
}
|
|
|
|
queue_pairs = vhost_vdpa_get_max_queue_pairs(vdpa_device_fd, features,
|
|
&has_cvq, errp);
|
|
if (queue_pairs < 0) {
|
|
qemu_close(vdpa_device_fd);
|
|
return queue_pairs;
|
|
}
|
|
|
|
if (opts->x_svq) {
|
|
struct vhost_vdpa_iova_range iova_range;
|
|
|
|
uint64_t invalid_dev_features =
|
|
features & ~vdpa_svq_device_features &
|
|
/* Transport are all accepted at this point */
|
|
~MAKE_64BIT_MASK(VIRTIO_TRANSPORT_F_START,
|
|
VIRTIO_TRANSPORT_F_END - VIRTIO_TRANSPORT_F_START);
|
|
|
|
if (invalid_dev_features) {
|
|
error_setg(errp, "vdpa svq does not work with features 0x%" PRIx64,
|
|
invalid_dev_features);
|
|
goto err_svq;
|
|
}
|
|
|
|
vhost_vdpa_get_iova_range(vdpa_device_fd, &iova_range);
|
|
iova_tree = vhost_iova_tree_new(iova_range.first, iova_range.last);
|
|
}
|
|
|
|
ncs = g_malloc0(sizeof(*ncs) * queue_pairs);
|
|
|
|
for (i = 0; i < queue_pairs; i++) {
|
|
ncs[i] = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name,
|
|
vdpa_device_fd, i, 2, true, opts->x_svq,
|
|
iova_tree);
|
|
if (!ncs[i])
|
|
goto err;
|
|
}
|
|
|
|
if (has_cvq) {
|
|
nc = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name,
|
|
vdpa_device_fd, i, 1, false,
|
|
opts->x_svq, iova_tree);
|
|
if (!nc)
|
|
goto err;
|
|
}
|
|
|
|
/* iova_tree ownership belongs to last NetClientState */
|
|
g_steal_pointer(&iova_tree);
|
|
return 0;
|
|
|
|
err:
|
|
if (i) {
|
|
for (i--; i >= 0; i--) {
|
|
qemu_del_net_client(ncs[i]);
|
|
}
|
|
}
|
|
|
|
err_svq:
|
|
qemu_close(vdpa_device_fd);
|
|
|
|
return -1;
|
|
}
|