netdev - Re: [RFC PATCH v1 11/16] afvsock: add 'seqpacket

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Date:   Wed, 30 Jun 2021 20:48:11 +0300
From:   Arseny Krasnov <arseny.krasnov@...persky.com>
To:     Stefano Garzarella <sgarzare@...hat.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>,
        Colin Ian King <colin.king@...onical.com>,
        Norbert Slusarek <nslusarek@....net>,
        Andra Paraschiv <andraprs@...zon.com>,
        kvm <kvm@...r.kernel.org>,
        Linux Virtualization <virtualization@...ts.linux-foundation.org>,
        netdev <netdev@...r.kernel.org>,
        kernel list <linux-kernel@...r.kernel.org>,
        Krasnov Arseniy <oxffffaa@...il.com>
Subject: Re: [RFC PATCH v1 11/16] afvsock: add 'seqpacket_drop()'


On 30.06.2021 15:12, Stefano Garzarella wrote:
> On Mon, Jun 28, 2021 at 01:04:12PM +0300, Arseny Krasnov wrote:
>> Add special callback for SEQPACKET socket which is called when
>> we need to drop current in-progress record: part of record was
>> copied successfully, reader wait rest of record, but signal
>> interrupts it and reader leaves it's loop, leaving packets of
>> current record still in queue. So to avoid copy of "orphaned"
>> record, we tell transport to drop every packet until EOR will
>> be found.
>>
>> Signed-off-by: Arseny Krasnov <arseny.krasnov@...persky.com>
>> ---
>> include/net/af_vsock.h   | 1 +
>> net/vmw_vsock/af_vsock.c | 1 +
>> 2 files changed, 2 insertions(+)
> And also for this change, I think you can merge with patches 12, 13, 14, 
> 15, otherwise if we bisect and we build at this patch, the 
> seqpacket_drop pointer is not valid.
>
> Thanks,
> Stefano
Ack
>
>> diff --git a/include/net/af_vsock.h b/include/net/af_vsock.h
>> index 1747c0b564ef..356878aabbd4 100644
>> --- a/include/net/af_vsock.h
>> +++ b/include/net/af_vsock.h
>> @@ -141,6 +141,7 @@ struct vsock_transport {
>>       int (*seqpacket_enqueue)(struct vsock_sock *vsk, struct msghdr *msg,
>>                                size_t len);
>>       bool (*seqpacket_allow)(u32 remote_cid);
>> +      void (*seqpacket_drop)(struct vsock_sock *vsk);
>>
>>       /* Notification. */
>>       int (*notify_poll_in)(struct vsock_sock *, size_t, bool *);
>> diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
>> index ec54e4222cbf..27fa38090e13 100644
>> --- a/net/vmw_vsock/af_vsock.c
>> +++ b/net/vmw_vsock/af_vsock.c
>> @@ -2024,6 +2024,7 @@ static int __vsock_seqpacket_recvmsg(struct sock *sk, struct msghdr *msg,
>>               intr_err = vsock_connectible_wait_data(sk, &wait, timeout, NULL, 0);
>>               if (intr_err <= 0) {
>>                       err = intr_err;
>> +                      transport->seqpacket_drop(vsk);
>>                       break;
>>               }
>>
>> --
>> 2.25.1
>>
>