[RFC PATCH v4 06/17] af_vsock: implement send logic for SEQPACKET
From: Arseny Krasnov <hidden>
Date: 2021-02-07 15:19:19
Also in:
kvm, lkml
Subsystem:
networking [general], the rest, vm sockets (af_vsock) · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds, Stefano Garzarella
This adds some logic to current stream enqueue function for SEQPACKET support: 1) Send record's begin/end marker. 2) Return value from enqueue function is whole record length or error for SOCK_SEQPACKET. Signed-off-by: Arseny Krasnov <redacted> --- include/net/af_vsock.h | 2 ++ net/vmw_vsock/af_vsock.c | 22 ++++++++++++++++++++-- 2 files changed, 22 insertions(+), 2 deletions(-)
diff --git a/include/net/af_vsock.h b/include/net/af_vsock.h
index 19f6f22821ec..198d58c4c7ee 100644
--- a/include/net/af_vsock.h
+++ b/include/net/af_vsock.h@@ -136,6 +136,8 @@ struct vsock_transport { bool (*stream_allow)(u32 cid, u32 port); /* SEQ_PACKET. */ + int (*seqpacket_seq_send_len)(struct vsock_sock *, size_t len, int flags); + int (*seqpacket_seq_send_eor)(struct vsock_sock *, int flags); size_t (*seqpacket_seq_get_len)(struct vsock_sock *); int (*seqpacket_dequeue)(struct vsock_sock *, struct msghdr *, int flags, bool *msg_ready);
diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
index ea99261e88ac..a033d3340ac4 100644
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c@@ -1806,6 +1806,12 @@ static int vsock_connectible_sendmsg(struct socket *sock, struct msghdr *msg, if (err < 0) goto out; + if (sk->sk_type == SOCK_SEQPACKET) { + err = transport->seqpacket_seq_send_len(vsk, len, msg->msg_flags); + if (err < 0) + goto out; + } + while (total_written < len) { ssize_t written;
@@ -1852,9 +1858,21 @@ static int vsock_connectible_sendmsg(struct socket *sock, struct msghdr *msg, } + if (sk->sk_type == SOCK_SEQPACKET) { + err = transport->seqpacket_seq_send_eor(vsk, msg->msg_flags); + if (err < 0) + goto out; + } + out_err: - if (total_written > 0) - err = total_written; + if (total_written > 0) { + /* Return number of written bytes only if: + * 1) SOCK_STREAM socket. + * 2) SOCK_SEQPACKET socket when whole buffer is sent. + */ + if (sk->sk_type == SOCK_STREAM || total_written == len) + err = total_written; + } out: release_sock(sk); return err;
--
2.25.1