пн, 15 нояб. 2021 г. в 07:47, Jason Wang <jasow...@redhat.com>:
> On Fri, Nov 12, 2021 at 5:14 PM Vladislav Yaroshchuk
> <yaroshchuk2...@gmail.com> wrote:
> >
> > Signed-off-by: Phillip Tennen <phil...@axleos.com>
> > Signed-off-by: Vladislav Yaroshchuk <yaroshchuk2...@gmail.com>
> > ---
>
> Commit log please.
>
>
>
Sorry, I don't understand what you mean here.
What is the 'commit log'?
> > net/vmnet-common.m | 305 +++++++++++++++++++++++++++++++++++++++++++++
> > net/vmnet-shared.c | 75 ++++++++++-
> > net/vmnet_int.h | 23 ++++
> > 3 files changed, 399 insertions(+), 4 deletions(-)
> >
> > diff --git a/net/vmnet-common.m b/net/vmnet-common.m
> > index 532d152840..b058e1b846 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 +19,307 @@
> > #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;
>
> Is there a way to disable the event when enable is false?
>
>
It seems there's no way except setting/unsetting
the callback via `vmnet_interface_set_event_callback`.
I decided to drop packages using `s->send_enabled`
without dealing with the callback.
> +}
> > +
> > +
> > +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";
> > + case VMNET_SHARING_SERVICE_BUSY:
> > + return "conflict, sharing service is in use";
> > + 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;
> > + }
> > +
> > + 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);
> > + 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;
> > + }));
> > + 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;
>
> It looks to me vmnet framework supports iov so I wonder if a
> .receive_iov() is better because of its performance.
>
>
I've just tried to implement this call, and because of some
reason `vmnet_write` fails with `VMNET_INVALID_ARGUMENT`
when iovcnt > 1. Tested with `vmxnet3`. Collecting all the iovs
into a big one and passing it to vmnet works fine (the default
behaviour when only the .receive() but not the .receive_iov()
is implemented).
This should be investigated, but currently I don't understand
what exactly causes this error. The fact that vmnet.framework
is a 'blackbox' makes the situation much worse.
Phillip's version is also broken:
https://patchew.org/QEMU/20210218134947.1860-1-phillip.en...@gmail.com/
Looks like this wasn't noticed before.
If it's applicable, we can use the .receive() only, and put
.receive_iov() implementation to the backlog.
> +
> > + 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..b27ada3219 100644
> > --- a/net/vmnet-shared.c
> > +++ b/net/vmnet-shared.c
> > @@ -10,16 +10,83 @@
> >
> > #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
> > + );
> > +
> > + xpc_dictionary_set_bool(
> > + if_desc,
> > + vmnet_enable_isolation_key,
> > + options->isolated
> > + );
> > +
> > + if (options->has_nat66_prefix) {
> > + xpc_dictionary_set_string(if_desc,
> > + vmnet_nat66_prefix_key,
> > + options->nat66_prefix);
> > + }
> > +
> > + if (options->has_dhcpstart ||
> > + options->has_dhcpend ||
> > + options->has_subnet_mask) {
> > +
> > + if (options->has_dhcpstart &&
> > + options->has_dhcpend &&
> > + options->has_subnet_mask) {
> > +
> > + xpc_dictionary_set_string(if_desc,
> > + vmnet_start_address_key,
> > + options->dhcpstart);
> > + xpc_dictionary_set_string(if_desc,
> > + vmnet_end_address_key,
> > + options->dhcpend);
> > + xpc_dictionary_set_string(if_desc,
> > + vmnet_subnet_mask_key,
> > + options->subnet_mask);
> > + } else {
> > + error_setg(
> > + errp,
> > + "'dhcpstart', 'dhcpend', '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
> >
>
--
Best Regards,
Vladislav Yaroshchuk
