Re: [RFC PATCH v2 1/9] vsock: use sk_rcvlowat to set POLLIN/POLLRDNORM

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On Mon, Jul 25, 2022 at 07:56:59AM +0000, Arseniy Krasnov wrote:
Both bits indicate, that next data read call won't be blocked, but when
sk_rcvlowat is not 1, these bits will be set by poll anyway, thus when
user tries to dequeue data,it will wait until sk_rcvlowat bytes of data
will be available.


The patch LGTM, but I suggest you to rewrite the title and commit of the message to better explain what this patch does (pass sock_rcvlowat to notify_poll_in as target) and then explain why as you already did (to set POLLIN/POLLRDNORM only when target is reached).

Thanks,
Stefano

Signed-off-by: Arseniy Krasnov <AVKrasnov@xxxxxxxxxxxxxx>
---
net/vmw_vsock/af_vsock.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
index f04abf662ec6..63a13fa2686a 100644
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c
@@ -1066,8 +1066,9 @@ static __poll_t vsock_poll(struct file *file, struct socket *sock,
		if (transport && transport->stream_is_active(vsk) &&
		    !(sk->sk_shutdown & RCV_SHUTDOWN)) {
			bool data_ready_now = false;
+			int target = sock_rcvlowat(sk, 0, INT_MAX);
			int ret = transport->notify_poll_in(
-					vsk, 1, &data_ready_now);
+					vsk, target, &data_ready_now);
			if (ret < 0) {
				mask |= EPOLLERR;
			} else {
--
2.25.1




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