Re: [RFC PATCH v3 8/9] vmci/vsock: check SO_RCVLOWAT before wake up reader

From: Vishnu Dasa
Date: Fri Aug 19 2022 - 00:47:05 EST




> On Aug 8, 2022, at 4:01 AM, Stefano Garzarella <sgarzare@xxxxxxxxxx> wrote:
>
> On Wed, Aug 03, 2022 at 02:05:52PM +0000, Arseniy Krasnov wrote:
>> This adds extra condition to wake up data reader: do it only when number
>> of readable bytes >= SO_RCVLOWAT. Otherwise, there is no sense to kick
>> user,because it will wait until SO_RCVLOWAT bytes will be dequeued.

Nit: add space after comma.

> Ditto as previous patch.
>
> @Bryan, @Vishnu, plaese, can you review/ack also this patch?

This patch looks good to me.

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

> Thanks,
> Stefano
>
>>
>> Signed-off-by: Arseniy Krasnov <AVKrasnov@xxxxxxxxxxxxxx>

Reviewed-by: Vishnu Dasa <vdasa@xxxxxxxxxx>

>> ---
>> net/vmw_vsock/vmci_transport_notify.c | 2 +-
>> net/vmw_vsock/vmci_transport_notify_qstate.c | 4 ++--
>> 2 files changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/net/vmw_vsock/vmci_transport_notify.c b/net/vmw_vsock/vmci_transport_notify.c
>> index 852097e2b9e6..7c3a7db134b2 100644
>> --- a/net/vmw_vsock/vmci_transport_notify.c
>> +++ b/net/vmw_vsock/vmci_transport_notify.c
>> @@ -307,7 +307,7 @@ vmci_transport_handle_wrote(struct sock *sk,
>> struct vsock_sock *vsk = vsock_sk(sk);
>> PKT_FIELD(vsk, sent_waiting_read) = false;
>> #endif
>> - sk->sk_data_ready(sk);
>> + vsock_data_ready(sk);
>> }
>>
>> static void vmci_transport_notify_pkt_socket_init(struct sock *sk)
>> diff --git a/net/vmw_vsock/vmci_transport_notify_qstate.c b/net/vmw_vsock/vmci_transport_notify_qstate.c
>> index 12f0cb8fe998..e96a88d850a8 100644
>> --- a/net/vmw_vsock/vmci_transport_notify_qstate.c
>> +++ b/net/vmw_vsock/vmci_transport_notify_qstate.c
>> @@ -84,7 +84,7 @@ vmci_transport_handle_wrote(struct sock *sk,
>> bool bottom_half,
>> struct sockaddr_vm *dst, struct sockaddr_vm *src)
>> {
>> - sk->sk_data_ready(sk);
>> + vsock_data_ready(sk);
>> }
>>
>> static void vsock_block_update_write_window(struct sock *sk)
>> @@ -282,7 +282,7 @@ vmci_transport_notify_pkt_recv_post_dequeue(
>> /* See the comment in
>> * vmci_transport_notify_pkt_send_post_enqueue().
>> */
>> - sk->sk_data_ready(sk);
>> + vsock_data_ready(sk);
>> }
>>
>> return err;
>> --
>> 2.25.1