On Fri, Jan 14, 2022 at 12:01 AM Vladislav Yaroshchuk
<yaroshchuk2...@gmail.com> wrote:
>
> Interaction with vmnet.framework in different modes
> differs only on configuration stage, so we can create
> common `send`, `receive`, etc. procedures and reuse them.
>
> vmnet.framework supports iov, but writing more than
> one iov into vmnet interface fails with
> 'VMNET_INVALID_ARGUMENT'. Collecting provided iovs into
> one and passing it to vmnet works fine. That's the
> reason why receive_iov() left unimplemented. But it still
> works with good enough performance having .receive()
> implemented only.
>
> Also, there is no way to unsubscribe from vmnet packages
> receiving except registering and unregistering event
> callback or simply drop packages just ignoring and
> not processing them when related flag is set. Here we do
> using the second way.
>
> Signed-off-by: Phillip Tennen <phil...@axleos.com>
> Signed-off-by: Vladislav Yaroshchuk <yaroshchuk2...@gmail.com>
> ---
> net/vmnet-common.m | 313 +++++++++++++++++++++++++++++++++++++++++++++
> net/vmnet-shared.c | 83 +++++++++++-
> net/vmnet_int.h | 23 ++++
> 3 files changed, 415 insertions(+), 4 deletions(-)
>
> diff --git a/net/vmnet-common.m b/net/vmnet-common.m
> index 532d152840..45c983ac7f 100644
> --- a/net/vmnet-common.m
> +++ b/net/vmnet-common.m
> @@ -10,6 +10,8 @@
> */
>
> #include "qemu/osdep.h"
> +#include "qemu/main-loop.h"
> +#include "qemu/log.h"
> #include "qapi/qapi-types-net.h"
> #include "vmnet_int.h"
> #include "clients.h"
> @@ -17,4 +19,315 @@
> #include "qapi/error.h"
>
> #include <vmnet/vmnet.h>
> +#include <dispatch/dispatch.h>
>
> +#ifdef DEBUG
> +#define D(x) x
> +#define D_LOG(...) qemu_log(__VA_ARGS__)
> +#else
> +#define D(x) do { } while (0)
> +#define D_LOG(...) do { } while (0)
> +#endif
> +
> +typedef struct vmpktdesc vmpktdesc_t;
> +typedef struct iovec iovec_t;
> +
> +static void vmnet_set_send_enabled(VmnetCommonState *s, bool enable)
> +{
> + s->send_enabled = enable;
> +}
> +
> +
> +static void vmnet_send_completed(NetClientState *nc, ssize_t len)
> +{
> + VmnetCommonState *s = DO_UPCAST(VmnetCommonState, nc, nc);
> + vmnet_set_send_enabled(s, true);
> +}
> +
> +
> +static void vmnet_send(NetClientState *nc,
> + interface_event_t event_id,
> + xpc_object_t event)
> +{
> + assert(event_id == VMNET_INTERFACE_PACKETS_AVAILABLE);
> +
> + VmnetCommonState *s;
> + uint64_t packets_available;
> +
> + struct iovec *iov;
> + struct vmpktdesc *packets;
> + int pkt_cnt;
> + int i;
> +
> + vmnet_return_t if_status;
> + ssize_t size;
> +
> + s = DO_UPCAST(VmnetCommonState, nc, nc);
> +
> + packets_available = xpc_dictionary_get_uint64(
> + event,
> + vmnet_estimated_packets_available_key
> + );
> +
> + pkt_cnt = (packets_available < VMNET_PACKETS_LIMIT) ?
> + packets_available :
> + VMNET_PACKETS_LIMIT;
> +
> +
> + iov = s->iov_buf;
> + packets = s->packets_buf;
> +
> + for (i = 0; i < pkt_cnt; ++i) {
> + packets[i].vm_pkt_size = s->max_packet_size;
> + packets[i].vm_pkt_iovcnt = 1;
> + packets[i].vm_flags = 0;
> + }
> +
> + if_status = vmnet_read(s->vmnet_if, packets, &pkt_cnt);
> + if (if_status != VMNET_SUCCESS) {
> + error_printf("vmnet: read failed: %s\n",
> + vmnet_status_map_str(if_status));
> + }
> + qemu_mutex_lock_iothread();
> + for (i = 0; i < pkt_cnt; ++i) {
> + size = qemu_send_packet_async(nc,
> + iov[i].iov_base,
> + packets[i].vm_pkt_size,
> + vmnet_send_completed);
> + if (size == 0) {
> + vmnet_set_send_enabled(s, false);
> + } else if (size < 0) {
> + break;
> + }
> + }
> + qemu_mutex_unlock_iothread();
> +
> +}
> +
> +
> +static void vmnet_register_event_callback(VmnetCommonState *s)
> +{
> + dispatch_queue_t avail_pkt_q = dispatch_queue_create(
> + "org.qemu.vmnet.if_queue",
> + DISPATCH_QUEUE_SERIAL
> + );
> +
> + vmnet_interface_set_event_callback(
> + s->vmnet_if,
> + VMNET_INTERFACE_PACKETS_AVAILABLE,
> + avail_pkt_q,
> + ^(interface_event_t event_id, xpc_object_t event) {
> + if (s->send_enabled) {
> + vmnet_send(&s->nc, event_id, event);
> + }
> + });
> +}
> +
> +
> +static void vmnet_bufs_init(VmnetCommonState *s)
> +{
> + int i;
> + struct vmpktdesc *packets;
> + struct iovec *iov;
> +
> + packets = s->packets_buf;
> + iov = s->iov_buf;
> +
> + for (i = 0; i < VMNET_PACKETS_LIMIT; ++i) {
> + iov[i].iov_len = s->max_packet_size;
> + iov[i].iov_base = g_malloc0(iov[i].iov_len);
> + packets[i].vm_pkt_iov = iov + i;
> + }
> +}
> +
> +
> +const char *vmnet_status_map_str(vmnet_return_t status)
> +{
> + switch (status) {
> + case VMNET_SUCCESS:
> + return "success";
> + case VMNET_FAILURE:
> + return "general failure";
> + case VMNET_MEM_FAILURE:
> + return "memory allocation failure";
> + case VMNET_INVALID_ARGUMENT:
> + return "invalid argument specified";
> + case VMNET_SETUP_INCOMPLETE:
> + return "interface setup is not complete";
> + case VMNET_INVALID_ACCESS:
> + return "invalid access, permission denied";
> + case VMNET_PACKET_TOO_BIG:
> + return "packet size is larger than MTU";
> + case VMNET_BUFFER_EXHAUSTED:
> + return "buffers exhausted in kernel";
> + case VMNET_TOO_MANY_PACKETS:
> + return "packet count exceeds limit";
> +#if defined(MAC_OS_VERSION_11_0) && \
> + MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_VERSION_11_0
> + case VMNET_SHARING_SERVICE_BUSY:
> + return "conflict, sharing service is in use";
> +#endif
> + default:
> + return "unknown vmnet error";
> + }
> +}
> +
> +
> +int vmnet_if_create(NetClientState *nc,
> + xpc_object_t if_desc,
> + Error **errp,
> + void (*completion_callback)(xpc_object_t
> interface_param))
> +{
> + VmnetCommonState *s;
> +
> + dispatch_queue_t if_create_q;
> + dispatch_semaphore_t if_created_sem;
> +
> + __block vmnet_return_t if_status;
> +
> + if_create_q = dispatch_queue_create("org.qemu.vmnet.create",
> + DISPATCH_QUEUE_SERIAL);
> + if_created_sem = dispatch_semaphore_create(0);
> +
> + xpc_dictionary_set_bool(
> + if_desc,
> + vmnet_allocate_mac_address_key,
> + false
> + );
> +
> + D(D_LOG("vmnet.start.interface_desc:\n");
> + xpc_dictionary_apply(if_desc,
> + ^bool(const char *k, xpc_object_t v) {
> + char *desc = xpc_copy_description(v);
> + D_LOG(" %s=%s\n", k, desc);
> + free(desc);
> + return true;
> + }));
> +
> + s = DO_UPCAST(VmnetCommonState, nc, nc);
> + s->vmnet_if = vmnet_start_interface(
> + if_desc,
> + if_create_q,
> + ^(vmnet_return_t status, xpc_object_t interface_param) {
> + if_status = status;
> + if (status != VMNET_SUCCESS || !interface_param) {
> + dispatch_semaphore_signal(if_created_sem);
> + return;
> + }
> +
> + D(D_LOG("vmnet.start.interface_param:\n");
> + xpc_dictionary_apply(interface_param,
> + ^bool(const char *k, xpc_object_t v) {
> + char *desc = xpc_copy_description(v);
> + D_LOG(" %s=%s\n", k, desc);
> + free(desc);
> + return true;
> + }));
> +
> + s->mtu = xpc_dictionary_get_uint64(
> + interface_param,
> + vmnet_mtu_key);
> + s->max_packet_size = xpc_dictionary_get_uint64(
> + interface_param,
> + vmnet_max_packet_size_key);
> +
> + if (completion_callback) {
> + completion_callback(interface_param);
> + }
> + dispatch_semaphore_signal(if_created_sem);
> + });
> +
> + if (s->vmnet_if == NULL) {
> + error_setg(errp, "unable to create interface with requested params");
> + return -1;
> + }
> +
> + dispatch_semaphore_wait(if_created_sem, DISPATCH_TIME_FOREVER);
> + dispatch_release(if_create_q);
> +
> + if (if_status != VMNET_SUCCESS) {
> + error_setg(errp,
> + "cannot create vmnet interface: %s",
> + vmnet_status_map_str(if_status));
> + return -1;
> + }
> +
> + vmnet_register_event_callback(s);
> + vmnet_bufs_init(s);
> + vmnet_set_send_enabled(s, true);
> +
> + return 0;
> +}
> +
> +
> +ssize_t vmnet_receive_common(NetClientState *nc,
> + const uint8_t *buf,
> + size_t size)
> +{
> + VmnetCommonState *s;
> + vmpktdesc_t packet;
> + iovec_t iov;
> + int pkt_cnt;
> + vmnet_return_t if_status;
> +
> + s = DO_UPCAST(VmnetCommonState, nc, nc);
> +
> + if (size > s->max_packet_size) {
> + warn_report("vmnet: packet is too big, %zu > %llu\n",
> + packet.vm_pkt_size,
> + s->max_packet_size);
> + return -1;
> + }
> +
> + iov.iov_base = (char *) buf;
> + iov.iov_len = size;
> +
> + packet.vm_pkt_iovcnt = 1;
> + packet.vm_flags = 0;
> + packet.vm_pkt_size = size;
> + packet.vm_pkt_iov = &iov;
> +
> + pkt_cnt = 1;
> + if_status = vmnet_write(s->vmnet_if, &packet, &pkt_cnt);
> +
> + if (if_status != VMNET_SUCCESS) {
> + error_report("vmnet: write error: %s\n",
> + vmnet_status_map_str(if_status));
> + }
> +
> + if (if_status == VMNET_SUCCESS && pkt_cnt) {
> + return size;
> + }
> + return 0;
> +}
> +
> +
> +void vmnet_cleanup_common(NetClientState *nc)
> +{
> + VmnetCommonState *s;
> + dispatch_queue_t if_destroy_q;
> +
> + s = DO_UPCAST(VmnetCommonState, nc, nc);
> +
> + qemu_purge_queued_packets(nc);
> + vmnet_set_send_enabled(s, false);
> +
> + if (s->vmnet_if == NULL) {
> + return;
> + }
> +
> + if_destroy_q = dispatch_queue_create(
> + "org.qemu.vmnet.destroy",
> + DISPATCH_QUEUE_SERIAL
> + );
> +
> + vmnet_stop_interface(
> + s->vmnet_if,
> + if_destroy_q,
> + ^(vmnet_return_t status) {
> + });
> +
> + for (int i = 0; i < VMNET_PACKETS_LIMIT; ++i) {
> + g_free(s->iov_buf[i].iov_base);
> + }
> +}
> diff --git a/net/vmnet-shared.c b/net/vmnet-shared.c
> index f8c4a4f3b8..0896a41d1a 100644
> --- a/net/vmnet-shared.c
> +++ b/net/vmnet-shared.c
> @@ -10,16 +10,91 @@
>
> #include "qemu/osdep.h"
> #include "qapi/qapi-types-net.h"
> +#include "qapi/error.h"
> #include "vmnet_int.h"
> #include "clients.h"
> -#include "qemu/error-report.h"
> -#include "qapi/error.h"
>
> #include <vmnet/vmnet.h>
>
> +typedef struct VmnetSharedState {
> + VmnetCommonState cs;
> +} VmnetSharedState;
> +
> +
> +static xpc_object_t create_if_desc(const Netdev *netdev, Error **errp)
> +{
> + const NetdevVmnetSharedOptions *options = &(netdev->u.vmnet_shared);
> + xpc_object_t if_desc = xpc_dictionary_create(NULL, NULL, 0);
> +
> + xpc_dictionary_set_uint64(
> + if_desc,
> + vmnet_operation_mode_key,
> + VMNET_SHARED_MODE
> + );
> +
> +#if defined(MAC_OS_VERSION_11_0) && \
> + MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_VERSION_11_0
> + xpc_dictionary_set_bool(
> + if_desc,
> + vmnet_enable_isolation_key,
> + options->isolated
> + );
> +#else
> + if (options->has_isolated) {
> + error_setg(errp,
> + "vmnet-shared.isolated feature is "
> + "unavailable: outdated vmnet.framework API");
> + }
> +#endif
Instead of MAC_OS_X_VERSION_MAX_ALLOWED, MAC_OS_X_VERSION_MIN_REQUIRED
should be used here. MAC_OS_X_VERSION_MIN_REQUIRED defines the lower
bound of the version range supported by the build while
MAC_OS_X_VERSION_MAX_ALLOWED defines the upper bound. Since the build
referencing vmnet_enable_isolation_key would not properly work on
macOS <11.0, the lower bound must be checked.
MacOSX.sdk/usr/include/AvailabilityMacros.h has a more detailed
explanation.
I'm CCing people receiving macOS 12 support patch series since we had
similar discussions there too.
https://lore.kernel.org/all/20220109170612.574104-1-f4...@amsat.org/
Regards,
Akihiko Odaki
> +
> + if (options->has_nat66_prefix) {
> + xpc_dictionary_set_string(if_desc,
> + vmnet_nat66_prefix_key,
> + options->nat66_prefix);
> + }
> +
> + if (options->has_start_address ||
> + options->has_end_address ||
> + options->has_subnet_mask) {
> +
> + if (options->has_start_address &&
> + options->has_end_address &&
> + options->has_subnet_mask) {
> +
> + xpc_dictionary_set_string(if_desc,
> + vmnet_start_address_key,
> + options->start_address);
> + xpc_dictionary_set_string(if_desc,
> + vmnet_end_address_key,
> + options->end_address);
> + xpc_dictionary_set_string(if_desc,
> + vmnet_subnet_mask_key,
> + options->subnet_mask);
> + } else {
> + error_setg(
> + errp,
> + "'start-address', 'end-address', 'subnet-mask' "
> + "should be provided together"
> + );
> + }
> + }
> +
> + return if_desc;
> +}
> +
> +static NetClientInfo net_vmnet_shared_info = {
> + .type = NET_CLIENT_DRIVER_VMNET_SHARED,
> + .size = sizeof(VmnetSharedState),
> + .receive = vmnet_receive_common,
> + .cleanup = vmnet_cleanup_common,
> +};
> +
> int net_init_vmnet_shared(const Netdev *netdev, const char *name,
> NetClientState *peer, Error **errp)
> {
> - error_setg(errp, "vmnet-shared is not implemented yet");
> - return -1;
> + NetClientState *nc = qemu_new_net_client(&net_vmnet_shared_info,
> + peer, "vmnet-shared", name);
> + xpc_object_t if_desc = create_if_desc(netdev, errp);
> +
> + return vmnet_if_create(nc, if_desc, errp, NULL);
> }
> diff --git a/net/vmnet_int.h b/net/vmnet_int.h
> index c5982259a4..3979fe4678 100644
> --- a/net/vmnet_int.h
> +++ b/net/vmnet_int.h
> @@ -16,10 +16,33 @@
>
> #include <vmnet/vmnet.h>
>
> +#define VMNET_PACKETS_LIMIT 50
> +
> typedef struct VmnetCommonState {
> NetClientState nc;
> + interface_ref vmnet_if;
> +
> + bool send_enabled;
> +
> + uint64_t mtu;
> + uint64_t max_packet_size;
> +
> + struct vmpktdesc packets_buf[VMNET_PACKETS_LIMIT];
> + struct iovec iov_buf[VMNET_PACKETS_LIMIT];
>
> } VmnetCommonState;
>
> +const char *vmnet_status_map_str(vmnet_return_t status);
> +
> +int vmnet_if_create(NetClientState *nc,
> + xpc_object_t if_desc,
> + Error **errp,
> + void (*completion_callback)(xpc_object_t
> interface_param));
> +
> +ssize_t vmnet_receive_common(NetClientState *nc,
> + const uint8_t *buf,
> + size_t size);
> +
> +void vmnet_cleanup_common(NetClientState *nc);
>
> #endif /* VMNET_INT_H */
> --
> 2.23.0
>
