linux-kernel - Re: [PATCH v11 00/18] virtio/vsock: introduce SOCK

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Message-ID: <20210611122533.cy4jce4vxhhou5ms@steredhat>
Date:   Fri, 11 Jun 2021 14:25:33 +0200
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     Arseny Krasnov <arseny.krasnov@...persky.com>
Cc:     Stefan Hajnoczi <stefanha@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Andra Paraschiv <andraprs@...zon.com>,
        Norbert Slusarek <nslusarek@....net>,
        Colin Ian King <colin.king@...onical.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "oxffffaa@...il.com" <oxffffaa@...il.com>
Subject: Re: [PATCH v11 00/18] virtio/vsock: introduce SOCK_SEQPACKET support

Hi Arseny,

On Fri, Jun 11, 2021 at 02:17:00PM +0300, Arseny Krasnov wrote:
>
>On 11.06.2021 14:07, Arseny Krasnov wrote:
>> 	This patchset implements support of SOCK_SEQPACKET for virtio
>> transport.
>> 	As SOCK_SEQPACKET guarantees to save record boundaries, so to
>> do it, new bit for field 'flags' was added: SEQ_EOR. This bit is
>> set to 1 in last RW packet of message.
>> 	Now as  packets of one socket are not reordered neither on vsock
>> nor on vhost transport layers, such bit allows to restore original
>> message on receiver's side. If user's buffer is smaller than message
>> length, when all out of size data is dropped.
>> 	Maximum length of datagram is limited by 'peer_buf_alloc' value.
>> 	Implementation also supports 'MSG_TRUNC' flags.
>> 	Tests also implemented.
>>
>> 	Thanks to stsp2@...dex.ru for encouragements and initial design
>> recommendations.
>>
>>  Arseny Krasnov (18):
>>   af_vsock: update functions for connectible socket
>>   af_vsock: separate wait data loop
>>   af_vsock: separate receive data loop
>>   af_vsock: implement SEQPACKET receive loop
>>   af_vsock: implement send logic for SEQPACKET
>>   af_vsock: rest of SEQPACKET support
>>   af_vsock: update comments for stream sockets
>>   virtio/vsock: set packet's type in virtio_transport_send_pkt_info()
>>   virtio/vsock: simplify credit update function API
>>   virtio/vsock: defines and constants for SEQPACKET
>>   virtio/vsock: dequeue callback for SOCK_SEQPACKET
>>   virtio/vsock: add SEQPACKET receive logic
>>   virtio/vsock: rest of SOCK_SEQPACKET support
>>   virtio/vsock: enable SEQPACKET for transport
>>   vhost/vsock: enable SEQPACKET for transport
>>   vsock/loopback: enable SEQPACKET for transport
>>   vsock_test: add SOCK_SEQPACKET tests
>>   virtio/vsock: update trace event for SEQPACKET
>>
>>  drivers/vhost/vsock.c                              |  56 ++-
>>  include/linux/virtio_vsock.h                       |  10 +
>>  include/net/af_vsock.h                             |   8 +
>>  .../trace/events/vsock_virtio_transport_common.h   |   5 +-
>>  include/uapi/linux/virtio_vsock.h                  |   9 +
>>  net/vmw_vsock/af_vsock.c                           | 464 ++++++++++++------
>>  net/vmw_vsock/virtio_transport.c                   |  26 ++
>>  net/vmw_vsock/virtio_transport_common.c            | 179 +++++++-
>>  net/vmw_vsock/vsock_loopback.c                     |  12 +
>>  tools/testing/vsock/util.c                         |  32 +-
>>  tools/testing/vsock/util.h                         |   3 +
>>  tools/testing/vsock/vsock_test.c                   | 116 ++++++
>>  12 files changed, 730 insertions(+), 190 deletions(-)
>>
>>  v10 -> v11:
>>  General changelog:
>>   - now data is copied to user's buffer only when
>>     whole message is received.
>>   - reader is woken up when EOR packet is received.
>>   - if read syscall was interrupted by signal or
>>     timeout, error is returned(not 0).
>>
>>  Per patch changelog:
>>   see every patch after '---' line.
>So here is new version for review with updates discussed earlier :)

Thanks, I'll review next week, but I suggest you again to split in two 
series, since patchwork (and netdev maintainers) are not happy with a 
series of 18 patches.

If you still prefer to keep them together during development, then 
please use the RFC tag.

Also did you take a look at the FAQ for netdev that I linked last time?
I don't see the net-next tag...

Thanks,
Stefano