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Re: [PATCH v5 3/6] net/vmnet: implement shared mode (vmnet-shared)
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From: |
Jason Wang |
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Subject: |
Re: [PATCH v5 3/6] net/vmnet: implement shared mode (vmnet-shared) |
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Date: |
Mon, 22 Nov 2021 10:41:03 +0800 |
On Fri, Nov 19, 2021 at 6:10 PM Vladislav Yaroshchuk
<yaroshchuk2000@gmail.com> wrote:
>
>
>
> пт, 19 нояб. 2021 г. в 05:57, Jason Wang <jasowang@redhat.com>:
>>
>> On Fri, Nov 19, 2021 at 1:12 AM Vladislav Yaroshchuk
>> <yaroshchuk2000@gmail.com> wrote:
>> >
>> >
>> >
>> > пн, 15 нояб. 2021 г. в 07:47, Jason Wang <jasowang@redhat.com>:
>> >>
>> >> On Fri, Nov 12, 2021 at 5:14 PM Vladislav Yaroshchuk
>> >> <yaroshchuk2000@gmail.com> wrote:
>> >> >
>> >> > Signed-off-by: Phillip Tennen <phillip@axleos.com>
>> >> > Signed-off-by: Vladislav Yaroshchuk <yaroshchuk2000@gmail.com>
>> >> > ---
>> >>
>> >> Commit log please.
>> >>
>> >>
>> >
>> > Sorry, I don't understand what you mean here.
>> > What is the 'commit log'?
>>
>> I meant the change log to describe the changes.
>>
>
> You mean more detailed commit message?
(replied twice, missing the list for the first time)
Yes, with a patch more than 300+ lines of changes, we need a good change log.
Thanks
> If not, can you please provide a short example
>
>> >
>> >>
>> >> > 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.
>>
>> ok.
>>
>> >
>> >> > +}
>> >> > +
>> >> > +
>> >> > +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.ennen@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.
>>
>> Ok, we can go with receive() first.
>>
>> Thanks
>>
>> >
>> >> > +
>> >> > + 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
>>
>
>
> --
> Best Regards,
>
> Vladislav Yaroshchuk
[PATCH v5 2/6] net/vmnet: add vmnet backends to qapi/net, Vladislav Yaroshchuk, 2021/11/12
[PATCH v5 6/6] net/vmnet: update qemu-options.hx, Vladislav Yaroshchuk, 2021/11/12
[PATCH v5 4/6] net/vmnet: implement host mode (vmnet-host), Vladislav Yaroshchuk, 2021/11/12
[PATCH v5 5/6] net/vmnet: implement bridged mode (vmnet-bridged), Vladislav Yaroshchuk, 2021/11/12
Re: [PATCH v5 0/6] Add vmnet.framework based network backend, Jason Wang, 2021/11/14