linux-kernel - Re: [RFC PATCH v4 06/17] vsock: check error queue to set EPOLLERR

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Message-ID: <94a133e5-a180-a9b5-91cb-c0ca44af35ea@sberdevices.ru>
Date:   Tue, 27 Jun 2023 07:44:25 +0300
From:   Arseniy Krasnov <avkrasnov@...rdevices.ru>
To:     Stefano Garzarella <sgarzare@...hat.com>
CC:     Stefan Hajnoczi <stefanha@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Bobby Eshleman <bobby.eshleman@...edance.com>,
        <kvm@...r.kernel.org>, <virtualization@...ts.linux-foundation.org>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <kernel@...rdevices.ru>, <oxffffaa@...il.com>
Subject: Re: [RFC PATCH v4 06/17] vsock: check error queue to set EPOLLERR



On 26.06.2023 19:04, Stefano Garzarella wrote:
> On Sat, Jun 03, 2023 at 11:49:28PM +0300, Arseniy Krasnov wrote:
>> If socket's error queue is not empty, EPOLLERR must be set. Otherwise,
>> reader of error queue won't detect data in it using EPOLLERR bit.
>>
>> Signed-off-by: Arseniy Krasnov <AVKrasnov@...rdevices.ru>
>> ---
>> net/vmw_vsock/af_vsock.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
> 
> This patch looks like it can go even without this series.
> 
> Is it a fix? Should we add a fixes tag?

Yes, it is fix and I can exclude it from this set to reduce number
of patches, but there is no reproducer for this without MSG_ZEROCOPY
support - at this moment this feature is the only user of error queue
for AF_VSOCK.

Thanks, Arseniy

> 
> Thanks,
> Stefano
> 
>>
>> diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
>> index efb8a0937a13..45fd20c4ed50 100644
>> --- a/net/vmw_vsock/af_vsock.c
>> +++ b/net/vmw_vsock/af_vsock.c
>> @@ -1030,7 +1030,7 @@ static __poll_t vsock_poll(struct file *file, struct socket *sock,
>>     poll_wait(file, sk_sleep(sk), wait);
>>     mask = 0;
>>
>> -    if (sk->sk_err)
>> +    if (sk->sk_err || !skb_queue_empty_lockless(&sk->sk_error_queue))
>>         /* Signify that there has been an error on this socket. */
>>         mask |= EPOLLERR;
>>
>> -- 
>> 2.25.1
>>
>