vhost-vdpa: introduce vhost-vdpa net client

This patch set introduces a new net client type: vhost-vdpa.
vhost-vdpa net client will set up a vDPA device which is specified
by a "vhostdev" parameter.

Signed-off-by: Lingshan Zhu <lingshan.zhu@intel.com>
Signed-off-by: Tiwei Bie <tiwei.bie@intel.com>
Signed-off-by: Cindy Lu <lulu@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20200701145538.22333-15-lulu@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>

4 files changed, 234 insertions, 1 deletions

diff --git a/net/Makefile.objs b/net/Makefile.objs
index c5d076d19c..5ab45545db 100644
--- a/net/Makefile.objs
+++ b/net/Makefile.objs
@@ -26,7 +26,7 @@ tap-obj-$(CONFIG_SOLARIS) = tap-solaris.o
 tap-obj-y ?= tap-stub.o
 common-obj-$(CONFIG_POSIX) += tap.o $(tap-obj-y)
 common-obj-$(CONFIG_WIN32) += tap-win32.o
-
+common-obj-$(CONFIG_VHOST_NET_VDPA) += vhost-vdpa.o
 vde.o-libs = $(VDE_LIBS)
 
 common-obj-$(CONFIG_CAN_BUS) += can/
diff --git a/net/clients.h b/net/clients.h
index a6ef267e19..92f9b59aed 100644
--- a/net/clients.h
+++ b/net/clients.h
@@ -61,4 +61,6 @@ int net_init_netmap(const Netdev *netdev, const char *name,
 int net_init_vhost_user(const Netdev *netdev, const char *name,
                         NetClientState *peer, Error **errp);
 
+int net_init_vhost_vdpa(const Netdev *netdev, const char *name,
+                        NetClientState *peer, Error **errp);
 #endif /* QEMU_NET_CLIENTS_H */
diff --git a/net/net.c b/net/net.c
index 9099a327dd..94dc546fb2 100644
--- a/net/net.c
+++ b/net/net.c
@@ -966,6 +966,9 @@ static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])(
 #ifdef CONFIG_VHOST_NET_USER
         [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user,
 #endif
+#ifdef CONFIG_VHOST_NET_VDPA
+        [NET_CLIENT_DRIVER_VHOST_VDPA] = net_init_vhost_vdpa,
+#endif
 #ifdef CONFIG_L2TPV3
         [NET_CLIENT_DRIVER_L2TPV3]    = net_init_l2tpv3,
 #endif
diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c
new file mode 100644
index 0000000000..bc0e0d2d35
--- /dev/null
+++ b/net/vhost-vdpa.c
@@ -0,0 +1,228 @@
+/*
+ * 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 <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;
+    uint64_t acked_features;
+    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_F_IOMMU_PLATFORM,
+    VIRTIO_F_RING_PACKED,
+    VIRTIO_NET_F_GUEST_ANNOUNCE,
+    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;
+}
+
+uint64_t vhost_vdpa_get_acked_features(NetClientState *nc)
+{
+    VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
+    assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
+    s->acked_features = vhost_net_get_acked_features(s->vhost_net);
+
+    return s->acked_features;
+}
+
+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 void vhost_vdpa_del(NetClientState *ncs)
+{
+    VhostVDPAState *s;
+    assert(ncs->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
+    s = DO_UPCAST(VhostVDPAState, nc, ncs);
+    if (s->vhost_net) {
+        vhost_net_cleanup(s->vhost_net);
+    }
+}
+
+static int vhost_vdpa_add(NetClientState *ncs, void *be)
+{
+    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;
+
+    net = vhost_net_init(&options);
+    if (!net) {
+        error_report("failed to init vhost_net for queue");
+        goto err;
+    }
+    if (s->vhost_net) {
+        vhost_net_cleanup(s->vhost_net);
+        g_free(s->vhost_net);
+    }
+    s->vhost_net = net;
+    ret = vhost_vdpa_net_check_device_id(net);
+    if (ret) {
+        goto err;
+    }
+    return 0;
+err:
+    if (net) {
+        vhost_net_cleanup(net);
+    }
+    vhost_vdpa_del(ncs);
+    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;
+    }
+}
+
+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 NetClientInfo net_vhost_vdpa_info = {
+        .type = NET_CLIENT_DRIVER_VHOST_VDPA,
+        .size = sizeof(VhostVDPAState),
+        .cleanup = vhost_vdpa_cleanup,
+        .has_vnet_hdr = vhost_vdpa_has_vnet_hdr,
+        .has_ufo = vhost_vdpa_has_ufo,
+};
+
+static int net_vhost_vdpa_init(NetClientState *peer, const char *device,
+                               const char *name, const char *vhostdev)
+{
+    NetClientState *nc = NULL;
+    VhostVDPAState *s;
+    int vdpa_device_fd = -1;
+    int ret = 0;
+    assert(name);
+    nc = qemu_new_net_client(&net_vhost_vdpa_info, peer, device, name);
+    snprintf(nc->info_str, sizeof(nc->info_str), TYPE_VHOST_VDPA);
+    nc->queue_index = 0;
+    s = DO_UPCAST(VhostVDPAState, nc, nc);
+    vdpa_device_fd = qemu_open(vhostdev, O_RDWR);
+    if (vdpa_device_fd == -1) {
+        return -errno;
+    }
+    s->vhost_vdpa.device_fd = vdpa_device_fd;
+    ret = vhost_vdpa_add(nc, (void *)&s->vhost_vdpa);
+    assert(s->vhost_net);
+    return ret;
+}
+
+static int net_vhost_check_net(void *opaque, QemuOpts *opts, Error **errp)
+{
+    const char *name = opaque;
+    const char *driver, *netdev;
+
+    driver = qemu_opt_get(opts, "driver");
+    netdev = qemu_opt_get(opts, "netdev");
+    if (!driver || !netdev) {
+        return 0;
+    }
+    if (strcmp(netdev, name) == 0 &&
+        !g_str_has_prefix(driver, "virtio-net-")) {
+        error_setg(errp, "vhost-vdpa requires frontend driver virtio-net-*");
+        return -1;
+    }
+    return 0;
+}
+
+int net_init_vhost_vdpa(const Netdev *netdev, const char *name,
+                        NetClientState *peer, Error **errp)
+{
+    const NetdevVhostVDPAOptions *opts;
+
+    assert(netdev->type == NET_CLIENT_DRIVER_VHOST_VDPA);
+    opts = &netdev->u.vhost_vdpa;
+    /* verify net frontend */
+    if (qemu_opts_foreach(qemu_find_opts("device"), net_vhost_check_net,
+                          (char *)name, errp)) {
+        return -1;
+    }
+    return net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name, opts->vhostdev);
+}