Re: [PATCH net-next v4 0/9] vsock: updates for SO_RCVLOWAT handling

patchwork-bot+netdevbpf
2022-08-23T11:23:26Z

Hello:

This series was applied to netdev/net-next.git (master)
by Paolo Abeni <pabeni@redhat.com>:

On Fri, 19 Aug 2022 05:21:58 +0000 you wrote:
> Hello,
>
> This patchset includes some updates for SO_RCVLOWAT:
>
> 1) af_vsock:
> During my experiments with zerocopy receive, i found, that in some
> cases, poll() implementation violates POSIX: when socket has non-
> default SO_RCVLOWAT(e.g. not 1), poll() will always set POLLIN and
> POLLRDNORM bits in 'revents' even number of bytes available to read
> on socket is smaller than SO_RCVLOWAT value. In this case,user sees
> POLLIN flag and then tries to read data(for example using 'read()'
> call), but read call will be blocked, because SO_RCVLOWAT logic is
> supported in dequeue loop in af_vsock.c. But the same time, POSIX
> requires that:
>
> [...]

Here is the summary with links:
- [net-next,v4,1/9] vsock: SO_RCVLOWAT transport set callback
https://git.kernel.org/netdev/net-next/c/e38f22c860ed
- [net-next,v4,2/9] hv_sock: disable SO_RCVLOWAT support
https://git.kernel.org/netdev/net-next/c/24764f8d3c31
- [net-next,v4,3/9] virtio/vsock: use 'target' in notify_poll_in callback
https://git.kernel.org/netdev/net-next/c/e7a3266c9167
- [net-next,v4,4/9] vmci/vsock: use 'target' in notify_poll_in callback
https://git.kernel.org/netdev/net-next/c/a274f6ff3c5c
- [net-next,v4,5/9] vsock: pass sock_rcvlowat to notify_poll_in as target
https://git.kernel.org/netdev/net-next/c/ee0b3843a269
- [net-next,v4,6/9] vsock: add API call for data ready
https://git.kernel.org/netdev/net-next/c/f2fdcf67aceb
- [net-next,v4,7/9] virtio/vsock: check SO_RCVLOWAT before wake up reader
https://git.kernel.org/netdev/net-next/c/39f1ed33a448
- [net-next,v4,8/9] vmci/vsock: check SO_RCVLOWAT before wake up reader
https://git.kernel.org/netdev/net-next/c/e061aed99855
- [net-next,v4,9/9] vsock_test: POLLIN + SO_RCVLOWAT test
https://git.kernel.org/netdev/net-next/c/b1346338fbae

You are awesome, thank you!
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