netdev - Re: [RFC PATCH v2 3/9] vmci/vsock: use 'target' in notify_poll

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Date:   Thu, 28 Jul 2022 06:05:01 +0000
From:   Arseniy Krasnov <AVKrasnov@...rdevices.ru>
To:     Stefano Garzarella <sgarzare@...hat.com>,
        Jorgen Hansen <jhansen@...are.com>
CC:     "David S. Miller" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "kys@...rosoft.com" <kys@...rosoft.com>,
        "haiyangz@...rosoft.com" <haiyangz@...rosoft.com>,
        "sthemmin@...rosoft.com" <sthemmin@...rosoft.com>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        "Dexuan Cui" <decui@...rosoft.com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        "Krasnov Arseniy" <oxffffaa@...il.com>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        kernel <kernel@...rdevices.ru>
Subject: Re: [RFC PATCH v2 3/9] vmci/vsock: use 'target' in notify_poll_in,
 callback

On 27.07.2022 15:22, Stefano Garzarella wrote:
> @Jorgen can you take a look at this series, especially this patch?
> 
> Maybe we need to update the comments in the else branch, something like
> s/there is nothing/there is not enough data
Ok, thanks!
> 
> Thanks,
> Stefano
> 
> On Mon, Jul 25, 2022 at 08:01:01AM +0000, Arseniy Krasnov wrote:
>> This callback controls setting of POLLIN,POLLRDNORM output bits of poll()
>> syscall,but in some cases,it is incorrectly to set it, when socket has
>> at least 1 bytes of available data. Use 'target' which is already exists
>> and equal to sk_rcvlowat in this case.
>>
>> Signed-off-by: Arseniy Krasnov <AVKrasnov@...rdevices.ru>
>> ---
>> net/vmw_vsock/vmci_transport_notify.c        | 2 +-
>> net/vmw_vsock/vmci_transport_notify_qstate.c | 2 +-
>> 2 files changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/net/vmw_vsock/vmci_transport_notify.c b/net/vmw_vsock/vmci_transport_notify.c
>> index d69fc4b595ad..1684b85b0660 100644
>> --- a/net/vmw_vsock/vmci_transport_notify.c
>> +++ b/net/vmw_vsock/vmci_transport_notify.c
>> @@ -340,7 +340,7 @@ vmci_transport_notify_pkt_poll_in(struct sock *sk,
>> {
>>     struct vsock_sock *vsk = vsock_sk(sk);
>>
>> -    if (vsock_stream_has_data(vsk)) {
>> +    if (vsock_stream_has_data(vsk) >= target) {
>>         *data_ready_now = true;
>>     } else {
>>         /* We can't read right now because there is nothing in the
>> diff --git a/net/vmw_vsock/vmci_transport_notify_qstate.c b/net/vmw_vsock/vmci_transport_notify_qstate.c
>> index 0f36d7c45db3..a40407872b53 100644
>> --- a/net/vmw_vsock/vmci_transport_notify_qstate.c
>> +++ b/net/vmw_vsock/vmci_transport_notify_qstate.c
>> @@ -161,7 +161,7 @@ vmci_transport_notify_pkt_poll_in(struct sock *sk,
>> {
>>     struct vsock_sock *vsk = vsock_sk(sk);
>>
>> -    if (vsock_stream_has_data(vsk)) {
>> +    if (vsock_stream_has_data(vsk) >= target) {
>>         *data_ready_now = true;
>>     } else {
>>         /* We can't read right now because there is nothing in the
>> -- 
>> 2.25.1
>