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[79.34.249.199]) by smtp.gmail.com with ESMTPSA id m7sm3982087ejk.52.2021.02.11.03.37.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 11 Feb 2021 03:37:55 -0800 (PST) Date: Thu, 11 Feb 2021 12:37:53 +0100 From: Stefano Garzarella To: Arseny Krasnov Cc: Stefan Hajnoczi , "Michael S. Tsirkin" , Jason Wang , "David S. Miller" , Jakub Kicinski , Jorgen Hansen , Colin Ian King , Andra Paraschiv , Jeff Vander Stoep , kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, stsp2@yandex.ru, oxffffaa@gmail.com Subject: Re: [RFC PATCH v4 03/17] af_vsock: separate receive data loop Message-ID: <20210211113753.o4zco3yromuxpvo2@steredhat> References: <20210207151259.803917-1-arseny.krasnov@kaspersky.com> <20210207151508.804615-1-arseny.krasnov@kaspersky.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline In-Reply-To: <20210207151508.804615-1-arseny.krasnov@kaspersky.com> Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On Sun, Feb 07, 2021 at 06:15:05PM +0300, Arseny Krasnov wrote: >This moves STREAM specific data receive logic to dedicated function: >'__vsock_stream_recvmsg()', while checks that will be same for both >types of socket are in shared function: 'vsock_connectible_recvmsg()'. > >Signed-off-by: Arseny Krasnov >--- > net/vmw_vsock/af_vsock.c | 117 +++++++++++++++++++++++---------------- > 1 file changed, 68 insertions(+), 49 deletions(-) > >diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c >index 38927695786f..66c8a932f49b 100644 >--- a/net/vmw_vsock/af_vsock.c >+++ b/net/vmw_vsock/af_vsock.c >@@ -1898,65 +1898,22 @@ static int vsock_wait_data(struct sock *sk, struct wait_queue_entry *wait, > return err; > } > >-static int >-vsock_connectible_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, >- int flags) >+static int __vsock_stream_recvmsg(struct sock *sk, struct msghdr *msg, >+ size_t len, int flags) > { >- struct sock *sk; >- struct vsock_sock *vsk; >+ struct vsock_transport_recv_notify_data recv_data; > const struct vsock_transport *transport; >- int err; >- size_t target; >+ struct vsock_sock *vsk; > ssize_t copied; >+ size_t target; > long timeout; >- struct vsock_transport_recv_notify_data recv_data; >+ int err; > > DEFINE_WAIT(wait); > >- sk = sock->sk; > vsk = vsock_sk(sk); >- err = 0; >- >- lock_sock(sk); >- > transport = vsk->transport; > >- if (!transport || sk->sk_state != TCP_ESTABLISHED) { >- /* Recvmsg is supposed to return 0 if a peer performs an >- * orderly shutdown. Differentiate between that case and when a >- * peer has not connected or a local shutdown occured with the >- * SOCK_DONE flag. >- */ >- if (sock_flag(sk, SOCK_DONE)) >- err = 0; >- else >- err = -ENOTCONN; >- >- goto out; >- } >- >- if (flags & MSG_OOB) { >- err = -EOPNOTSUPP; >- goto out; >- } >- >- /* We don't check peer_shutdown flag here since peer may actually shut >- * down, but there can be data in the queue that a local socket can >- * receive. >- */ >- if (sk->sk_shutdown & RCV_SHUTDOWN) { >- err = 0; >- goto out; >- } >- >- /* It is valid on Linux to pass in a zero-length receive buffer. This >- * is not an error. We may as well bail out now. >- */ >- if (!len) { >- err = 0; >- goto out; >- } >- > /* We must not copy less than target bytes into the user's buffer > * before returning successfully, so we wait for the consume queue to > * have that much data to consume before dequeueing. Note that this At the end of __vsock_stream_recvmsg() you are calling release_sock(sk) and it's wrong since we are releasing it in vsock_connectible_recvmsg(). Please fix it. >@@ -2020,6 +1977,68 @@ vsock_connectible_recvmsg(struct socket *sock, >struct msghdr *msg, size_t len, > return err; > } > >+static int >+vsock_connectible_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, >+ int flags) >+{ >+ struct sock *sk; >+ struct vsock_sock *vsk; >+ const struct vsock_transport *transport; >+ int err; >+ >+ DEFINE_WAIT(wait); >+ >+ sk = sock->sk; >+ vsk = vsock_sk(sk); >+ err = 0; >+ >+ lock_sock(sk); >+ >+ transport = vsk->transport; >+ >+ if (!transport || sk->sk_state != TCP_ESTABLISHED) { >+ /* Recvmsg is supposed to return 0 if a peer performs an >+ * orderly shutdown. Differentiate between that case and when a >+ * peer has not connected or a local shutdown occurred with the >+ * SOCK_DONE flag. >+ */ >+ if (sock_flag(sk, SOCK_DONE)) >+ err = 0; >+ else >+ err = -ENOTCONN; >+ >+ goto out; >+ } >+ >+ if (flags & MSG_OOB) { >+ err = -EOPNOTSUPP; >+ goto out; >+ } >+ >+ /* We don't check peer_shutdown flag here since peer may actually shut >+ * down, but there can be data in the queue that a local socket can >+ * receive. >+ */ >+ if (sk->sk_shutdown & RCV_SHUTDOWN) { >+ err = 0; >+ goto out; >+ } >+ >+ /* It is valid on Linux to pass in a zero-length receive buffer. This >+ * is not an error. We may as well bail out now. >+ */ >+ if (!len) { >+ err = 0; >+ goto out; >+ } >+ >+ err = __vsock_stream_recvmsg(sk, msg, len, flags); >+ >+out: >+ release_sock(sk); >+ return err; >+} >+ The rest of the patch LGTM. Stefano