linux-kernel - Re: [RFC PATCH v3 4/9] vmci/vsock: use 'target' in notify_poll

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Message-ID: <0783F6F8-901A-4186-B4E7-01FE099F1939@vmware.com>
Date:   Fri, 19 Aug 2022 04:49:56 +0000
From:   Vishnu Dasa <vdasa@...are.com>
To:     Stefano Garzarella <sgarzare@...hat.com>
CC:     Arseniy Krasnov <AVKrasnov@...rdevices.ru>,
        Bryan Tan <bryantan@...are.com>,
        Pv-drivers <Pv-drivers@...are.com>,
        "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>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        kernel <kernel@...rdevices.ru>
Subject: Re: [RFC PATCH v3 4/9] vmci/vsock: use 'target' in notify_poll_in
 callback


> On Aug 8, 2022, at 3:36 AM, Stefano Garzarella <sgarzare@...hat.com> wrote:
> 
> On Wed, Aug 03, 2022 at 01:57:54PM +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.
> 
> Ditto as the previous patch.
> With that fixed:
> 
> Reviewed-by: Stefano Garzarella <sgarzare@...hat.com>
> 
> @Bryan, @Vishnu, if you're happy with this change, can you ack/review?

This patch looks good to me.

Thank you, Arseniy for running the test with VMCI.  I also ran some of
our internal tests successfully with this patch series.

> Thanks,
> Stefano
> 
>> 
>> Signed-off-by: Arseniy Krasnov <AVKrasnov@...rdevices.ru>

Reviewed-by: Vishnu Dasa <vdasa@...are.com>

>> ---
>> net/vmw_vsock/vmci_transport_notify.c        | 8 ++++----
>> net/vmw_vsock/vmci_transport_notify_qstate.c | 8 ++++----
>> 2 files changed, 8 insertions(+), 8 deletions(-)
>> 
>> diff --git a/net/vmw_vsock/vmci_transport_notify.c b/net/vmw_vsock/vmci_transport_notify.c
>> index d69fc4b595ad..852097e2b9e6 100644
>> --- a/net/vmw_vsock/vmci_transport_notify.c
>> +++ b/net/vmw_vsock/vmci_transport_notify.c
>> @@ -340,12 +340,12 @@ 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
>> -               * queue. Ask for notifications when there is something to
>> -               * read.
>> +              /* We can't read right now because there is not enough data
>> +               * in the queue. Ask for notifications when there is something
>> +               * to read.
>>               */
>>              if (sk->sk_state == TCP_ESTABLISHED) {
>>                      if (!send_waiting_read(sk, 1))
>> diff --git a/net/vmw_vsock/vmci_transport_notify_qstate.c b/net/vmw_vsock/vmci_transport_notify_qstate.c
>> index 0f36d7c45db3..12f0cb8fe998 100644
>> --- a/net/vmw_vsock/vmci_transport_notify_qstate.c
>> +++ b/net/vmw_vsock/vmci_transport_notify_qstate.c
>> @@ -161,12 +161,12 @@ 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
>> -               * queue. Ask for notifications when there is something to
>> -               * read.
>> +              /* We can't read right now because there is not enough data
>> +               * in the queue. Ask for notifications when there is something
>> +               * to read.
>>               */
>>              if (sk->sk_state == TCP_ESTABLISHED)
>>                      vsock_block_update_write_window(sk);
>> --
>> 2.25.1