net/vhost-vdpa.c - qemu - Git at Google

 /*
  * vhost-vdpa.c
  *
  * Copyright(c) 2017-2018 Intel Corporation.
  * Copyright(c) 2020 Red Hat, Inc.
  *
  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  * See the COPYING file in the top-level directory.
  *
  */

 #include "qemu/osdep.h"
 #include "clients.h"
 #include "net/vhost_net.h"
 #include "net/vhost-vdpa.h"
 #include "hw/virtio/vhost-vdpa.h"
 #include "qemu/config-file.h"
 #include "qemu/error-report.h"
 #include "qemu/option.h"
 #include "qapi/error.h"
 #include <linux/vhost.h>
 #include <sys/ioctl.h>
 #include <err.h>
 #include "standard-headers/linux/virtio_net.h"
 #include "monitor/monitor.h"
 #include "hw/virtio/vhost.h"

 /* Todo:need to add the multiqueue support here */
 typedef struct VhostVDPAState {
     NetClientState nc;
     struct vhost_vdpa vhost_vdpa;
     VHostNetState *vhost_net;
     bool started;
 } VhostVDPAState;

 const int vdpa_feature_bits[] = {
     VIRTIO_F_NOTIFY_ON_EMPTY,
     VIRTIO_RING_F_INDIRECT_DESC,
     VIRTIO_RING_F_EVENT_IDX,
     VIRTIO_F_ANY_LAYOUT,
     VIRTIO_F_VERSION_1,
     VIRTIO_NET_F_CSUM,
     VIRTIO_NET_F_GUEST_CSUM,
     VIRTIO_NET_F_GSO,
     VIRTIO_NET_F_GUEST_TSO4,
     VIRTIO_NET_F_GUEST_TSO6,
     VIRTIO_NET_F_GUEST_ECN,
     VIRTIO_NET_F_GUEST_UFO,
     VIRTIO_NET_F_HOST_TSO4,
     VIRTIO_NET_F_HOST_TSO6,
     VIRTIO_NET_F_HOST_ECN,
     VIRTIO_NET_F_HOST_UFO,
     VIRTIO_NET_F_MRG_RXBUF,
     VIRTIO_NET_F_MTU,
     VIRTIO_NET_F_CTRL_RX,
     VIRTIO_NET_F_CTRL_RX_EXTRA,
     VIRTIO_NET_F_CTRL_VLAN,
     VIRTIO_NET_F_GUEST_ANNOUNCE,
     VIRTIO_NET_F_CTRL_MAC_ADDR,
     VIRTIO_NET_F_RSS,
     VIRTIO_NET_F_MQ,
     VIRTIO_NET_F_CTRL_VQ,
     VIRTIO_F_IOMMU_PLATFORM,
     VIRTIO_F_RING_PACKED,
     VIRTIO_NET_F_RSS,
     VIRTIO_NET_F_HASH_REPORT,
     VIRTIO_NET_F_GUEST_ANNOUNCE,
     VIRTIO_NET_F_STATUS,
     VHOST_INVALID_FEATURE_BIT
 };

 VHostNetState *vhost_vdpa_get_vhost_net(NetClientState *nc)
 {
     VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
     assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
     return s->vhost_net;
 }

 static int vhost_vdpa_net_check_device_id(struct vhost_net *net)
 {
     uint32_t device_id;
     int ret;
     struct vhost_dev *hdev;

     hdev = (struct vhost_dev *)&net->dev;
     ret = hdev->vhost_ops->vhost_get_device_id(hdev, &device_id);
     if (device_id != VIRTIO_ID_NET) {
         return -ENOTSUP;
     }
     return ret;
 }

 static int vhost_vdpa_add(NetClientState *ncs, void *be,
                           int queue_pair_index, int nvqs)
 {
     VhostNetOptions options;
     struct vhost_net *net = NULL;
     VhostVDPAState *s;
     int ret;

     options.backend_type = VHOST_BACKEND_TYPE_VDPA;
     assert(ncs->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
     s = DO_UPCAST(VhostVDPAState, nc, ncs);
     options.net_backend = ncs;
     options.opaque      = be;
     options.busyloop_timeout = 0;
     options.nvqs = nvqs;

     net = vhost_net_init(&options);
     if (!net) {
         error_report("failed to init vhost_net for queue");
         goto err_init;
     }
     s->vhost_net = net;
     ret = vhost_vdpa_net_check_device_id(net);
     if (ret) {
         goto err_check;
     }
     return 0;
 err_check:
     vhost_net_cleanup(net);
     g_free(net);
 err_init:
     return -1;
 }

 static void vhost_vdpa_cleanup(NetClientState *nc)
 {
     VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);

     if (s->vhost_net) {
         vhost_net_cleanup(s->vhost_net);
         g_free(s->vhost_net);
         s->vhost_net = NULL;
     }
      if (s->vhost_vdpa.device_fd >= 0) {
         qemu_close(s->vhost_vdpa.device_fd);
         s->vhost_vdpa.device_fd = -1;
     }
 }

 static bool vhost_vdpa_has_vnet_hdr(NetClientState *nc)
 {
     assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);

     return true;
 }

 static bool vhost_vdpa_has_ufo(NetClientState *nc)
 {
     assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
     VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
     uint64_t features = 0;
     features |= (1ULL << VIRTIO_NET_F_HOST_UFO);
     features = vhost_net_get_features(s->vhost_net, features);
     return !!(features & (1ULL << VIRTIO_NET_F_HOST_UFO));

 }

 static bool vhost_vdpa_check_peer_type(NetClientState *nc, ObjectClass *oc,
                                        Error **errp)
 {
     const char *driver = object_class_get_name(oc);

     if (!g_str_has_prefix(driver, "virtio-net-")) {
         error_setg(errp, "vhost-vdpa requires frontend driver virtio-net-*");
         return false;
     }

     return true;
 }

 /** Dummy receive in case qemu falls back to userland tap networking */
 static ssize_t vhost_vdpa_receive(NetClientState *nc, const uint8_t *buf,
                                   size_t size)
 {
     return 0;
 }

 static NetClientInfo net_vhost_vdpa_info = {
         .type = NET_CLIENT_DRIVER_VHOST_VDPA,
         .size = sizeof(VhostVDPAState),
         .receive = vhost_vdpa_receive,
         .cleanup = vhost_vdpa_cleanup,
         .has_vnet_hdr = vhost_vdpa_has_vnet_hdr,
         .has_ufo = vhost_vdpa_has_ufo,
         .check_peer_type = vhost_vdpa_check_peer_type,
 };

 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)
 {
     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_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;
     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_max_queue_pairs(int fd, 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;
     uint64_t features;
     int ret;

     ret = ioctl(fd, VHOST_GET_FEATURES, &features);
     if (ret) {
         error_setg(errp, "Fail to query features from vhost-vDPA device");
         return 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;
     int vdpa_device_fd;
     NetClientState **ncs, *nc;
     int queue_pairs, i, 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;
     }

     queue_pairs = vhost_vdpa_get_max_queue_pairs(vdpa_device_fd,
                                                  &has_cvq, errp);
     if (queue_pairs < 0) {
         qemu_close(vdpa_device_fd);
         return queue_pairs;
     }

     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);
         if (!ncs[i])
             goto err;
     }

     if (has_cvq) {
         nc = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name,
                                  vdpa_device_fd, i, 1, false);
         if (!nc)
             goto err;
     }

     g_free(ncs);
     return 0;

 err:
     if (i) {
         qemu_del_net_client(ncs[0]);
     }
     qemu_close(vdpa_device_fd);
     g_free(ncs);

     return -1;
 }
	/*
	* vhost-vdpa.c
	*
	* Copyright(c) 2017-2018 Intel Corporation.
	* Copyright(c) 2020 Red Hat, Inc.
	*
	* This work is licensed under the terms of the GNU GPL, version 2 or later.
	* See the COPYING file in the top-level directory.
	*
	*/

	#include "qemu/osdep.h"
	#include "clients.h"
	#include "net/vhost_net.h"
	#include "net/vhost-vdpa.h"
	#include "hw/virtio/vhost-vdpa.h"
	#include "qemu/config-file.h"
	#include "qemu/error-report.h"
	#include "qemu/option.h"
	#include "qapi/error.h"
	#include <linux/vhost.h>
	#include <sys/ioctl.h>
	#include <err.h>
	#include "standard-headers/linux/virtio_net.h"
	#include "monitor/monitor.h"
	#include "hw/virtio/vhost.h"

	/* Todo:need to add the multiqueue support here */
	typedef struct VhostVDPAState {
	NetClientState nc;
	struct vhost_vdpa vhost_vdpa;
	VHostNetState *vhost_net;
	bool started;
	} VhostVDPAState;

	const int vdpa_feature_bits[] = {
	VIRTIO_F_NOTIFY_ON_EMPTY,
	VIRTIO_RING_F_INDIRECT_DESC,
	VIRTIO_RING_F_EVENT_IDX,
	VIRTIO_F_ANY_LAYOUT,
	VIRTIO_F_VERSION_1,
	VIRTIO_NET_F_CSUM,
	VIRTIO_NET_F_GUEST_CSUM,
	VIRTIO_NET_F_GSO,
	VIRTIO_NET_F_GUEST_TSO4,
	VIRTIO_NET_F_GUEST_TSO6,
	VIRTIO_NET_F_GUEST_ECN,
	VIRTIO_NET_F_GUEST_UFO,
	VIRTIO_NET_F_HOST_TSO4,
	VIRTIO_NET_F_HOST_TSO6,
	VIRTIO_NET_F_HOST_ECN,
	VIRTIO_NET_F_HOST_UFO,
	VIRTIO_NET_F_MRG_RXBUF,
	VIRTIO_NET_F_MTU,
	VIRTIO_NET_F_CTRL_RX,
	VIRTIO_NET_F_CTRL_RX_EXTRA,
	VIRTIO_NET_F_CTRL_VLAN,
	VIRTIO_NET_F_GUEST_ANNOUNCE,
	VIRTIO_NET_F_CTRL_MAC_ADDR,
	VIRTIO_NET_F_RSS,
	VIRTIO_NET_F_MQ,
	VIRTIO_NET_F_CTRL_VQ,
	VIRTIO_F_IOMMU_PLATFORM,
	VIRTIO_F_RING_PACKED,
	VIRTIO_NET_F_RSS,
	VIRTIO_NET_F_HASH_REPORT,
	VIRTIO_NET_F_GUEST_ANNOUNCE,
	VIRTIO_NET_F_STATUS,
	VHOST_INVALID_FEATURE_BIT
	};

	VHostNetState vhost_vdpa_get_vhost_net(NetClientState nc)
	{
	VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
	assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
	return s->vhost_net;
	}

	static int vhost_vdpa_net_check_device_id(struct vhost_net *net)
	{
	uint32_t device_id;
	int ret;
	struct vhost_dev *hdev;

	hdev = (struct vhost_dev *)&net->dev;
	ret = hdev->vhost_ops->vhost_get_device_id(hdev, &device_id);
	if (device_id != VIRTIO_ID_NET) {
	return -ENOTSUP;
	}
	return ret;
	}

	static int vhost_vdpa_add(NetClientState ncs, void be,
	int queue_pair_index, int nvqs)
	{
	VhostNetOptions options;
	struct vhost_net *net = NULL;
	VhostVDPAState *s;
	int ret;

	options.backend_type = VHOST_BACKEND_TYPE_VDPA;
	assert(ncs->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
	s = DO_UPCAST(VhostVDPAState, nc, ncs);
	options.net_backend = ncs;
	options.opaque = be;
	options.busyloop_timeout = 0;
	options.nvqs = nvqs;

	net = vhost_net_init(&options);
	if (!net) {
	error_report("failed to init vhost_net for queue");
	goto err_init;
	}
	s->vhost_net = net;
	ret = vhost_vdpa_net_check_device_id(net);
	if (ret) {
	goto err_check;
	}
	return 0;
	err_check:
	vhost_net_cleanup(net);
	g_free(net);
	err_init:
	return -1;
	}

	static void vhost_vdpa_cleanup(NetClientState *nc)
	{
	VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);

	if (s->vhost_net) {
	vhost_net_cleanup(s->vhost_net);
	g_free(s->vhost_net);
	s->vhost_net = NULL;
	}
	if (s->vhost_vdpa.device_fd >= 0) {
	qemu_close(s->vhost_vdpa.device_fd);
	s->vhost_vdpa.device_fd = -1;
	}
	}

	static bool vhost_vdpa_has_vnet_hdr(NetClientState *nc)
	{
	assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);

	return true;
	}

	static bool vhost_vdpa_has_ufo(NetClientState *nc)
	{
	assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
	VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
	uint64_t features = 0;
	features \|= (1ULL << VIRTIO_NET_F_HOST_UFO);
	features = vhost_net_get_features(s->vhost_net, features);
	return !!(features & (1ULL << VIRTIO_NET_F_HOST_UFO));

	}

	static bool vhost_vdpa_check_peer_type(NetClientState nc, ObjectClass oc,
	Error **errp)
	{
	const char *driver = object_class_get_name(oc);

	if (!g_str_has_prefix(driver, "virtio-net-")) {
	error_setg(errp, "vhost-vdpa requires frontend driver virtio-net-*");
	return false;
	}

	return true;
	}

	/** Dummy receive in case qemu falls back to userland tap networking */
	static ssize_t vhost_vdpa_receive(NetClientState nc, const uint8_t buf,
	size_t size)
	{
	return 0;
	}

	static NetClientInfo net_vhost_vdpa_info = {
	.type = NET_CLIENT_DRIVER_VHOST_VDPA,
	.size = sizeof(VhostVDPAState),
	.receive = vhost_vdpa_receive,
	.cleanup = vhost_vdpa_cleanup,
	.has_vnet_hdr = vhost_vdpa_has_vnet_hdr,
	.has_ufo = vhost_vdpa_has_ufo,
	.check_peer_type = vhost_vdpa_check_peer_type,
	};

	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)
	{
	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_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;
	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_max_queue_pairs(int fd, 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;
	uint64_t features;
	int ret;

	ret = ioctl(fd, VHOST_GET_FEATURES, &features);
	if (ret) {
	error_setg(errp, "Fail to query features from vhost-vDPA device");
	return 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;
	int vdpa_device_fd;
	NetClientState *ncs, nc;
	int queue_pairs, i, 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;
	}

	queue_pairs = vhost_vdpa_get_max_queue_pairs(vdpa_device_fd,
	&has_cvq, errp);
	if (queue_pairs < 0) {
	qemu_close(vdpa_device_fd);
	return queue_pairs;
	}

	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);
	if (!ncs[i])
	goto err;
	}

	if (has_cvq) {
	nc = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name,
	vdpa_device_fd, i, 1, false);
	if (!nc)
	goto err;
	}

	g_free(ncs);
	return 0;

	err:
	if (i) {
	qemu_del_net_client(ncs[0]);
	}
	qemu_close(vdpa_device_fd);
	g_free(ncs);

	return -1;
	}